JP7422508B2 - Fastening tool - Google Patents

Description

The present invention relates to a fastening tool for fastening work materials through fasteners.

2. Description of the Related Art A fastening tool is known that fastens a plurality of workpieces through a fastener (for example, a multi-piece swage type fastener, a blind rivet) that includes a pin and a cylindrical portion. For example, the fastening tool disclosed in Patent Document 1 uses a ball screw mechanism to move a pin gripping part that grips a pin of a fastener with respect to an anvil that can engage with a cylindrical part of a fastener. The fastener is pulled strongly in the axial direction to deform the fastener and fasten the workpiece. The ball screw mechanism includes a nut rotatably supported by a housing and a screw shaft that moves linearly as the nut rotates.

JP 2018-103257 Publication

Fastening tools such as those described above are desired to have high output. On the other hand, considering the possibility that the fastening tool will be used in a place where the surrounding space is narrow, it is desirable that the distance from the drive shaft of the ball screw mechanism to the outer surface of the housing be as small as possible.

In view of this situation, it is an object of the present invention to provide a fastening tool with a configuration for suppressing the distance from the drive shaft to the outer surface of the housing.

According to one aspect of the present invention, a fastening tool configured to fasten a workpiece via a fastener including a pin and a cylindrical portion is provided. The fastening tool includes a housing, a handle, an anvil, a pin grip, a motor, and a drive mechanism.

The housing extends along the first axis. The first axis defines the front-rear direction of the fastening tool. A handle projects from the housing in a direction transverse to the first axis. The anvil is configured to be able to come into contact with the cylindrical portion of the fastener. The anvil is also coupled to the front end of the housing so as to extend along the first axis. The pin gripping section is configured to be able to grip the pin. Further, the pin gripping portion is held movably with respect to the anvil along the first axis. The motor is housed in the housing. The drive mechanism is at least partially housed in the housing. Further, the drive mechanism is driven by the power of the motor and is configured to move the pin gripping portion in the front and rear directions with respect to the anvil.

The drive mechanism includes a rotating member having a driven gear, a moving member, a drive gear, and an idle gear. The rotating member is rotatably supported by the housing around the first axis. The driven gear is provided on the outer periphery of the rotating member. The moving member is connected to the pin gripper. Further, the moving member is configured to engage with the rotating member and to be linearly moved in the front-rear direction by rotation of the rotating member. The drive gear is arranged on the second shaft and configured to be rotated around the second shaft by the power of the motor. If the direction perpendicular to the first axis and corresponding to the extending direction of the handle is defined as the vertical direction of the fastening tool, and in the vertical direction, the direction in which the handle protrudes from the housing is defined as the downward direction, then the second The axis extends below and parallel to the first axis. The idle gear meshes with the drive gear and the driven gear.

In the fastening tool of this aspect, a first axis extending in the front-rear direction and a second axis extending parallel to the first axis are set below the first axis. The power of the motor is then transmitted to the drive gear on the lower second shaft, and via the idle gear to the rotating member on the upper first shaft. By arranging the idle gear in this manner, the diameter of the driven gear can be made smaller than when the driven gear directly meshes with the drive gear on the second shaft. Thereby, the distance from the first axis to the top surface of the housing can be suppressed.

In one aspect of the present invention, the drive mechanism may further include a planetary reducer disposed between the motor and the drive gear in the power transmission path. The planetary speed reducer may be disposed within the housing on the second axis and directly below the rotating member. In this case, the fastening tool can be made more compact in the front-rear direction. In this aspect, it is preferable that the driven gear is disposed in front of the center position of the rotating member in the longitudinal direction. In this case, the space below the portion of the rotating member on the rear side of the driven gear can be effectively utilized as a space for arranging a planetary speed reducer or the like.

In one aspect of the present invention, the planetary speed reducer and the idle gear may be arranged so as to partially overlap when viewed from the front or rear. In this case, the fastening tool can be made more compact in the vertical direction.

In one aspect of the invention, the housing may include a first housing and a second housing. The first housing may house at least a rotating member, a drive gear, and an idle gear. The second housing may house at least the motor and a portion of the moving member. In this case, the lubricant can be held within the first housing that accommodates various gears that require lubrication.

In one aspect of the present invention, the drive mechanism may further include a planetary reducer disposed between the motor and the drive gear in the power transmission path. The planetary speed reducer may constitute a speed reducer assembly together with a case that houses the planetary speed reducer. The speed reducer assembly may then be removably coupled to the first housing. In this case, the ease of assembling the fastening tool can be improved. In this aspect, it is preferable that a sealing member is disposed between the speed reducer assembly and the first housing. In this case, leakage of lubricant from the connecting portion between the speed reducer assembly and the first housing can be suppressed.

In one aspect of the present invention, the internal space of the second housing may include a first region in which the motor is accommodated, and a second region in which at least a portion of the moving member is accommodated. The first region and the second region may be separated by a partition wall. In this case, even if foreign matter (for example, dust) enters the first region, the partition wall can prevent the foreign matter from entering the second region and affecting the moving member.

In one aspect of the present invention, the drive mechanism may further include a planetary reducer disposed between the motor and the drive gear in the power transmission path. The handle may protrude from a portion of the housing directly below the planetary reducer. In this case, the user can grasp the handle at a position close to the center of gravity of the drive mechanism.

It is an explanatory view showing an example of a fastener. It is a left side view of a fastening tool. FIG. 3 is a cross-sectional view of the fastening tool when the screw shaft is placed in the initial position. 4 is a partially enlarged view of FIG. 3. FIG. It is a front view of a fastening tool. 4 is a partially enlarged view of FIG. 3. FIG. FIG. 6 is a cross-sectional view of the fastening tool when the screw shaft is moved backward from the initial position. FIG. 3 is a partial cross-sectional view of another fastening tool. FIG. 3 is a cross-sectional view of another fastening tool.

[First embodiment]
The fastening tool 101 according to the first embodiment will be described below with reference to FIGS. 1 to 7. The fastening tool 101 of this embodiment is configured to fasten work materials using fasteners. Furthermore, the fastening tool 101 can selectively use multiple types of fasteners. First, with reference to FIG. 1, the fastener 8, which is an example of a fastener that can be used with the fastening tool 101, will be described.

The fastener 8 shown in FIG. 1 is an example of a known fastener called a multi-piece swage type fastener. The fastener 8 is composed of a pin 81 and a collar 85. The pin 81 includes a shaft portion 811 and a head 815 integrally formed at one end of the shaft portion 811. The collar 85 is a cylindrical member into which the shaft portion 811 can be inserted. The pin 81 and the collar 85 were originally formed separately from each other. The collar 85 is deformed by pulling the shaft portion 811 of the pin 81 in the axial direction with respect to the collar 85 by the fastening tool 101 (see FIG. 2), and the head 815 of the pin 81 and the shaft portion 811 of the pin 81 are crimped. The work material W is fastened to the collar 85 that has been attached.

Note that multi-member crimping type fasteners include types in which a portion of the pin shaft (also referred to as pin tail or mandrel) is torn off (hereinafter simply referred to as tear-off type or breakage type), and There is a type in which the parts are maintained as they are without being torn off (hereinafter also simply referred to as the shaft maintenance type). The fastener 8 is of a type in which the shaft portion 811 can be torn off. Regardless of the type, there are multiple types of fasteners that differ in the axial length, diameter, and material of the pin and collar, as well as the position, number, shape, etc. of the grooves formed in the shaft portion. Note that the fastening tool 101 can selectively use a plurality of types of fasteners by replacing the nose assembly 61 (see FIG. 2), which will be described later.

The schematic configuration of the fastening tool 101 will be described below.

As shown in FIGS. 2 and 3, the outer shell of the fastening tool 101 is mainly formed by a main body housing 10, a nose 16, a handle 17, and a battery housing 18. The main body housing 10 is formed into a rectangular box shape as a whole and extends along a predetermined drive axis A1. The main body housing 10 houses the motor 2 and the drive mechanism 3. The nose 16 protrudes from one end of the main body housing 10 in the longitudinal direction (extending direction of the drive shaft A1) along the drive shaft A1. The handle 17 protrudes from the central portion of the main body housing 10 in the longitudinal direction in a direction intersecting the drive shaft A1 (more specifically, in a direction substantially perpendicular to the drive axis A1). The handle 17 is provided with a trigger 171 that is pulled (pressed) by the user. The battery housing 18 has an inverted U-shape as a whole and is connected to the protruding end of the handle 17. A rechargeable battery 182 can be attached to and detached from the battery housing 18 . When the user engages, for example, the fastener 8 (see FIG. 1) with the tip of the nose 16 and pulls the trigger 171, the motor 2 is driven and the pin 81 is pulled in the axial direction with respect to the collar 85. The workpiece is fastened by the fastener 8.

In the following, regarding the direction of the fastening tool 101, for convenience of explanation, the extending direction of the drive shaft A1 (or the long axis of the main body housing 10) is defined as the front-back direction of the fastening tool 101. In the front-rear direction, the side where the nose 16 is arranged is defined as the front side, and the opposite side is defined as the rear side. Further, a direction perpendicular to the drive shaft A1 and corresponding to the extending direction of the long axis of the handle 17 is defined as an up-down direction. In the vertical direction, the protruding end side of the handle 17 (battery housing 18 side) is defined as the lower side, and the base end side of the handle 17 (main body housing 10 side) is defined as the upper side. Further, a direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction.

The detailed configuration of the fastening tool 101 will be described below.

First, the internal structure of the main body housing 10 will be explained. As shown in FIG. 4, the main body housing 10 mainly accommodates a motor 2 and a drive mechanism 3 driven by the motor 2.

The motor 2 is housed in the lower part of the rear end of the main body housing 10. In this embodiment, a brushless direct current (DC) motor is used as the motor 2. The motor 2 includes a motor body 21 that includes a stator and a rotor, and a motor shaft 23 that rotates integrally with the rotor. The motor 2 is arranged such that the rotation axis A2 of the motor shaft 23 extends below the drive shaft A1 and parallel to the drive shaft A1 (that is, in the front-rear direction). A fan 27 is fixed to the rear end of the motor shaft 23.

The drive mechanism 3 is a mechanism configured to use the power of the motor 2 to move a jaw assembly 63 (see FIG. 3), which will be described later, in the front-back direction with respect to the anvil 62 (see FIG. 3) along the drive shaft A1. It is. In this embodiment, the drive mechanism 3 includes a planetary reducer 300, a nut drive gear 311 provided on the first intermediate shaft 31, an idle gear 331 provided on the second intermediate shaft 33, and a ball screw mechanism 5. include. Below, these configurations will be explained in order.

The planetary reducer 300 is disposed coaxially with the motor 2 within the main body housing 10 on the front side of the motor 2 . The planetary reducer 300 is a reducer using a planetary gear mechanism, and is configured to increase the torque input from the motor shaft 23 and output it to the first intermediate shaft 31. In this embodiment, the planetary reducer 300 is configured as a three-stage planetary reducer including three sets of planetary gear mechanisms. Note that since the configuration of the planetary gear mechanism itself is well known, detailed explanation thereof will be omitted here. A sun gear 302 of a first stage (the most upstream side of the power transmission path) planetary gear mechanism is connected to the motor shaft 23, which is an input shaft of the planetary reducer 300. The output shaft of the planetary reducer 300 is the carrier 303 of the third stage (the most downstream side of the power transmission path) planetary gear mechanism. Note that the planetary reducer 300 is housed in the reducer case 13 and held by the main body housing 10.

The first intermediate shaft 31 extends forward from the planetary reducer 300 along the rotation axis A2 within the main body housing 10, coaxially with the motor shaft 23 and the planetary reducer 300. The first intermediate shaft 31 is connected to a carrier 303 of a third stage planetary gear mechanism of the planetary reducer 300. The first intermediate shaft 31 is rotatably supported around the rotation axis A2 by a bearing, and rotates integrally with the carrier 303. The nut drive gear 311 is integrally provided on the outer circumference of the first intermediate shaft 31.

The second intermediate shaft 33 is above the first intermediate shaft 31 and extends parallel to the first intermediate shaft 31 . The idle gear 331 is supported by the second intermediate shaft 33 via a bearing, and is rotatable about the rotation axis A3 (the axis of the second intermediate shaft 33) with respect to the second intermediate shaft 33. The idle gear 331 meshes with the nut drive gear 311 and the driven gear 511 of the nut 51, which will be described later, but does not affect the ratio of their rotational speeds (gear ratio).

The ball screw mechanism 5 mainly includes a nut 51 and a screw shaft 56. In this embodiment, the ball screw mechanism 5 is configured to convert the rotational movement of the nut 51 into a linear movement of the screw shaft 56 to linearly move a jaw assembly 63, which will be described later.

The nut 51 is supported by the main body housing 10 in such a manner that its movement in the front-rear direction is restricted and is rotatable around the drive shaft A1. The nut 51 has a driven gear 511 integrally provided on its outer circumference. The nut 51 is supported by bearings (radial bearings) 521 and 522 on the front and rear sides of the driven gear 511. Note that the nut drive gear 311 and the driven gear 511 are configured as a reduction gear mechanism.

In this embodiment, the nut 51 is formed in an elongated cylindrical shape, and the length of the nut 51 in the front-rear direction is greater than the combined length of the planetary reduction gear 300 and the first intermediate shaft 31. The front end of the nut 51 is located in front of the front ends of the nut drive gear 311 and the idle gear 331, and the rear end of the nut 51 is located at approximately the same position as the rear end of the planetary reducer 300.

The driven gear 511 is disposed on the front side of the center position of the nut 51 in the axial direction (front-back direction). Therefore, the portion of the nut 51 on the rear side of the driven gear 511 is relatively long. Therefore, the planetary reducer 300 is arranged in a space directly below this portion. That is, when the drive mechanism 3 is viewed from above or below, the portion of the nut 51 on the rear side of the driven gear 511 and the planetary reduction gear 300 are at least partially overlapped. In this embodiment, this arrangement makes the fastening tool 101 more compact in the front-rear direction.

Furthermore, as shown in FIG. 5, the drive shaft A1, which is the rotation axis of the driven gear 511, the motor shaft 23, the output shaft of the planetary reducer 300 (third stage carrier 303), and the rotation axis A2 of the nut drive gear 311, In addition, the rotation axes A3 of the idle gears 331 are all on the same plane P that is perpendicular to the axis extending in the left-right direction. Furthermore, when viewed from the front (or rear), the planetary reducer 300 and the idle gear 331 partially overlap in the vertical direction. With this arrangement, the fastening tool 101 can be made more compact in the vertical direction.

Although details will be described later, in the fastening process, a strong axial force (axial force) acts on the nut 51 in the extending direction (front-back direction) of the drive shaft A1. Therefore, as shown in FIG. 4, when axial forces (also referred to as thrust loads) in the front and rear directions are applied to the nut 51 on the front and rear sides of the nut 51 in the front-rear direction, the axial A front receiving portion 53 and a rear receiving portion 55 are provided for receiving force. Details of the front receiving part 53 and the rear receiving part 55 will be described later.

The screw shaft 56 engages with the nut 51 in such a manner that its rotation around the drive shaft A1 is regulated and is movable in the front-rear direction along the drive shaft A1. More specifically, the screw shaft 56 is configured as an elongated body, and is inserted through the nut 51 so as to extend along the drive shaft A1. Although detailed illustrations are omitted, a large number of balls can roll within the orbit defined by the spiral groove formed on the inner peripheral surface of the nut 51 and the spiral groove formed on the outer peripheral surface of the screw shaft 56. It is located. The screw shaft 56 engages with the nut 51 via these balls.

Further, although detailed illustrations are omitted, a pair of arms extending leftward and rightward from the screw shaft 56 are provided at the rear end portion of the screw shaft 56. Each arm rotatably supports a roller. The rollers are engaged with guide grooves of a roller guide fixed to the main body housing 10. The roller is configured to be able to roll back and forth along the guide groove while being restricted from moving up and down. With such a configuration, when the nut 51 is rotated around the drive shaft A1, the screw shaft 56 is moved in a straight line in the front-rear direction with respect to the nut 51 and the main body housing 10 while the rotation around the drive shaft A1 is restricted. move in a shape.

Although details will be described later, as shown in FIG. 6, a jaw assembly 63 is connected to the front end of the screw shaft 56 via a jaw connecting member 66. For this reason, a male thread is formed at the front end of the threaded shaft 56.

As shown in FIG. 4 , an extending shaft 561 is coaxially connected and fixed to the rear end of the screw shaft 56 and is integrated with the screw shaft 56 . Hereinafter, the integrated screw shaft 56 and extended shaft 561 will be collectively referred to as a drive shaft 560. Drive shaft 560 has a through hole that passes through drive shaft 560 along drive axis A1. An opening 147 having a circular cross section is formed on the drive shaft A1 at the rear end of the main body housing 10. The opening 147 is configured to allow a collection container 148 to be attached and detached. The collection container 148 is a container for storing pintails separated during the fastening process. The pintail separated from the fastener reaches the collection container 148 through the through hole of the drive shaft 560 and is received in the collection container 148.

In the drive mechanism 3 configured as described above, the torque of the motor 2 is increased by the planetary reducer 300 on the rotation axis A2, is transmitted to the nut drive gear 311 rotated around the rotation axis A2, and is transmitted to the idle gear 331. is transmitted to the driven gear 511 of the nut 51 on the drive shaft A1. In this way, by arranging the idle gear 331 between the nut drive gear 311 and the driven gear 511, the diameter of the driven gear 511 can be reduced compared to the case where the nut drive gear 311 and the driven gear 511 mesh directly. can. Thereby, it is possible to suppress an increase in the distance from the drive shaft A1 to the upper surface of the main body housing 10 (so-called center height). Furthermore, by increasing the vertical distance between the drive shaft A1 and the rotating shaft A2 by arranging the idle gear 331, it is possible to arrange a relatively large planetary reducer 300 on the rotating shaft A2 and achieve high output. can.

The detailed configuration of the main body housing 10 will be described below. As shown in FIG. 4, the main housing 10 includes a first housing 12 and a second housing 14 that are connected to each other.

In this embodiment, the first housing 12 accommodates the first intermediate shaft 31 , the nut drive gear 311 , the second intermediate shaft 33 , the idle gear 331 , and the nut 51 of the drive mechanism 3 .

The first housing 12 is a hollow metal body. In this embodiment, the first housing 12 is made of an alloy containing aluminum as a main component to reduce weight. Due to the longitudinal length relationship between the nut 51 and the first intermediate shaft 31 described above, the upper half of the first housing 12 that accommodates the nut 51 is larger than the lower half that accommodates the nut drive gear 311 and the idle gear 331. It is longer in the front and back direction than the half. The front part 125 and the rear part 127 of the upper half protrude forward and rearward, respectively, than the lower half, and are formed in a cylindrical shape.

The first housing 12 supports the first intermediate shaft 31, the second intermediate shaft 33, and the nut 51. More specifically, the first intermediate shaft 31 is supported via bearings held by the front wall 121 and rear wall 122 of the lower half of the first housing 12. A rear end portion of the first intermediate shaft 31 projects rearward from a through hole formed in the rear wall 122. The second intermediate shaft 33 is fitted into and supported by support holes formed in the front wall 121 and the rear wall 122. The nut 51 is supported via bearings 521 and 522 held within the cylindrical front 125 and rear 127 of the first housing 12 . Note that the front end and rear end of the drive shaft 560 protrude forward and backward from the first housing 12.

Furthermore, in this embodiment, the planetary reducer 300 and the reducer case 13 that accommodates the planetary reducer 300 constitute a reducer assembly 30 that is removably attached to the first housing 12 . The reducer case 13 is a cylindrical hollow body as a whole, and has a circular front wall 131 and a circular rear wall, and a cylindrical peripheral wall. Note that the reducer case 13 is made of resin. A third stage carrier 303 of the planetary speed reducer 300 projects from the center of the front wall 131 . The rear end portion of the first intermediate shaft 31 can be fitted into the carrier 303 .

In order to make the reducer assembly 30 removable, the rear wall 122 of the first housing 12 has an annular recess 123 recessed forward from the rear surface. On the other hand, the front wall 131 of the reducer case 13 has an annular projection 133 that projects forward. An annular seal member (O-ring) 137 is attached to the outer periphery of the protrusion 133 . The seal member 137 can securely connect the reducer case 13 to the first housing 12 and prevent the lubricant disposed inside the first housing 12 and the reducer case 13 from leaking. Note that the sealing member 137 may be provided not in the reducer case 13 but in the first housing 12 (inner circumference of the recess 123).

In this way, by configuring the planetary reducer 300 and the reducer case 13 as a single reducer assembly 30 that can be attached to and detached from the first housing 12, ease of assembly can be improved.

The second housing 14 includes a portion of the first housing 12 (specifically, the lower half of the first housing 12 that houses the nut drive gear 311 and the idle gear 331), the reducer assembly 30, the motor 2, and the drive shaft 560. This is a housing that accommodates the rear end portion (the portion protruding from the first housing 12). The second housing 14 is made of resin.

As shown in FIGS. 2 and 5, in this embodiment, the second housing 14 is formed by connecting left and right halves with screws. Further, the left and right halves of the second housing 14 are integrally formed with a handle 17, a hand guard 175, and the left and right halves of the battery housing 18, which will be described later. The first housing 12 is held fixedly by the second housing 14 by being partially sandwiched between the left and right halves.

As shown in FIG. 4 , the first housing 12 and the reducer assembly 30 connected to the first housing 12 are arranged in a front region of the interior space of the second housing 14 . The motor 2 and the rear end portion of the drive shaft 560 are arranged in the rear region of the internal space of the second housing 14 . More specifically, the motor 2 is disposed in the lower half of the rear region, and the rear end of the drive shaft 560 is disposed in the upper half of the rear region. Hereinafter, the lower half region of the rear region will be referred to as a motor region 141, and the upper half region will be referred to as a shaft region 142.

As shown in FIG. 2, a plurality of intake ports 145 and a plurality of exhaust ports 146 are provided in a portion of the second housing 14 that covers the motor region 141. More specifically, the intake port 145 is provided on the radially outer side of the motor main body portion 21 , and the exhaust port 146 is provided on the radially outer side of the fan 27 . When the fan 27 rotates integrally with the motor shaft 23 as the motor 2 is driven, air flows into the second housing 14 from the intake port 145, passes through the motor body 21 and the fan 27, and flows out from the exhaust port 146. An air flow is generated. The motor 2 is cooled by this air flow.

As shown in FIG. 4, the second housing 14 has a partition wall 143 that partitions a motor region 141 and a shaft region 142. The partition wall 143 connects to the left and right walls of the second housing 14 . The partition wall 143 extends forward from approximately the rear end of the second housing 14 to a position above the front end of the planetary reducer 300 and approximately in contact with the rear wall 122 of the first housing 12 . The partition wall 143 can prevent dust from entering the shaft region 142 even when the dust enters the motor region 141 from the air intake port 145 together with the cooling air of the motor 2 .

The nose 16 will be explained below. As shown in FIG. 6, nose 16 includes a nose assembly 61 and a nose adapter 65 that holds nose assembly 61. As shown in FIG. Note that the term "assembly" used in this embodiment is defined not only as a single assembly formed by assembling multiple parts, but also as a set for use in a specific purpose. Also refers to multiple separate parts. Note that the above-described reduction gear assembly 30 corresponds to the former, and the nose assembly 61 corresponds to the latter. Hereinafter, the nose assembly 61 and the nose adapter 65 will be explained in order.

The nose assembly 61 is configured to be able to abut (engage) with the collar 85 of the fastener 8 (see FIG. 1), and is configured to be able to grip the anvil 62 held in the main body housing 10 and the pin 81 of the fastener 8, The main body includes a jaw assembly 63 which is held so as to be movable relative to the anvil 62 in the front-rear direction along the drive shaft A1. Note that the configuration of the nose assembly 61 is well known and will be briefly described below.

Anvil 62 is generally cylindrical and has a bore 621 extending along drive axis A1. In this embodiment, the anvil 62 is made of iron (or an alloy containing iron as a main component) to ensure sufficient strength. The tip of the bore 621 is configured to have a smaller diameter than other portions, and can abut (engage) with the collar 85. Furthermore, a locking flange 625 that projects radially outward is provided on the outer circumferential portion of the anvil 62 at a slightly rear end side of the center portion.

Jaw assembly 63 is held within bore 621 coaxially with anvil 62 and is slidable within bore 621 . Although detailed illustrations are omitted, the jaw assembly 63 has a plurality of claws (also referred to as jaws) that can grip the shaft portion 811 (see FIG. 1) of the pin 81. The jaw assembly 63 is configured so that as it moves backward from the initial position with respect to the anvil 62, the gripping force of the claws increases. The rear end of the jaw assembly 63 is formed into a cylindrical shape, and the inner peripheral surface is threaded.

In this embodiment, the nose assembly 61 is attachable to and detachable from the front portion 125 of the main body housing 10 (specifically, the first housing 12) via the nose adapter 65. As described above, the fastening tool 101 of this embodiment can selectively use a plurality of types of fasteners. The user attaches an appropriate type of nose assembly 61 to the main body housing 10 depending on the fastener actually used. In this embodiment, the nose assembly 61 for the tear-off type fastener 8 is illustrated, but the nose assembly 61 corresponding to the axis maintenance type fastener also includes an anvil that can come into contact with the collar of the fastener, and a pin gripper. Basically the same as the nose assembly 61 for the fastener 8 in that it has a plurality of possible pawls and a pin gripper held movably relative to the anvil along the drive axis A1. It can be said that it has a structure.

Nose adapter 65 is configured to connect anvil 62 to body housing 10 and to connect jaw assembly 63 to threaded shaft 56 . More specifically, nose adapter 65 includes a jaw coupling member 66, an anvil coupling sleeve 67, and a locking ring 68.

The jaw connecting member 66 is a cylindrical member that connects the screw shaft 56 and the jaw assembly 63. The outer diameter of the jaw connecting member 66 increases in the order of the front end, the center, and the rear end. The front end of the jaw coupling member 66 is configured as a male thread that engages with a female thread on the rear end of the jaw assembly 63. The outer diameter of the rear end of the jaw coupling member 66 is approximately equal to the inner diameter of the rear half of the anvil coupling sleeve 67. Hereinafter, the large-diameter rear end portion of the jaw connecting member 66 will be referred to as a large-diameter portion 661. The large diameter portion 661 is configured as a female thread that is screwed into a male thread formed at the front end of the threaded shaft 56 . In this way, the jaw coupling member 66 is threaded onto the front end of the threaded shaft 56 and the rear end of the jaw assembly 63 to couple the threaded shaft 56 and the jaw assembly 63 together. Note that the jaw connecting member 66 is formed with a through hole that passes through the jaw connecting member 66 along the drive shaft A1 and communicates with the through hole of the drive shaft 560.

The anvil connecting sleeve 67 and the fixing ring 68 are members for connecting the anvil 62 to the main body housing 10 (specifically, the first housing 12).

The anvil connecting sleeve 67 is formed as a stepped cylindrical body with a diameter larger in the rear half than in the front half, and has a bore 671 extending along the drive shaft A1. In this embodiment, the anvil connecting sleeve 67 is made of iron (or an alloy containing iron as a main component) to ensure sufficient strength. The first half of the bore 671 has a diameter approximately equal to the outer diameter of the anvil 62. An anvil 62 is arranged in the first half of the bore 671. The second half of the bore 671 has a larger diameter than the first half. In the latter half of the bore 671, the large diameter portion 661 of the jaw coupling member 66 is arranged so as to be slidable along the drive shaft A1. Note that an annular seal member (O-ring) 663 is attached to the outer circumferential portion of the large diameter portion 661. The seal member 663 closes the space between the outer peripheral surface of the large diameter portion 661 and the inner peripheral surface of the anvil connecting sleeve 67, thereby preventing dust from entering the bore 671 through the bore 621 from the opening at the front end of the anvil 62. In this case, dust can be prevented from entering into the main body housing 10.

The rear end portion of the anvil connecting sleeve 67 is connected to the main body housing 10 (specifically, the first housing 12) by screwing. More specifically, the front end portion of the front portion 125 of the first housing 12 (the portion adjacent to the opening at the front end of the first housing 12) is configured as a female threaded portion 126 with a thread cut on the inner peripheral surface. . On the other hand, the rear end portion of the anvil connecting sleeve 67 is configured as a male threaded portion 672 having a thread cut on the outer circumferential surface thereof to be threaded into the female threaded portion 126 . Note that the female threaded portion 126 and the male threaded portion 672 are configured such that the tightening direction of the screw is opposite to the rotational direction of the nut 51 when the screw shaft 56 is moved rearward.

A flange 675 is provided on the outer periphery of the anvil connection sleeve 67 and projects radially outward. The anvil connecting sleeve 67 is positioned at a position where the flange 675 abuts the front end surface of the front portion 125 in the front-rear direction.

The fixing ring 68 is formed as a stepped cylindrical body with a diameter larger in the rear half than in the front half. The latter half of the fixing ring 68 is configured as a female thread, and can be screwed into a male thread formed at the front end of the anvil connection sleeve 67.

Retaining ring 68 is coupled to anvil coupling sleeve 67 with anvil 62 fitted into bore 671 of anvil coupling sleeve 67 . Thereby, the anvil 62 is connected to the main body housing 10 by the anvil connecting sleeve 67 and the fixing ring 68. Note that the locking flange 625 of the anvil 62 is arranged in a gap between the front end of the anvil connecting sleeve 67 and a stepped portion (boundary between the first half and the second half) inside the fixing ring 68.

Hereinafter, details of the front side receiving part 53 and the rear side receiving part 55 provided on the front side and the rear side of the nut 51, respectively, will be explained in order.

As shown in FIG. 6, the front receiving part 53 is arranged between the rear end surface 673 of the anvil connecting sleeve 67 and the front end surface 513 of the nut 51 in the extending direction (front-back direction) of the drive shaft A1. . The front receiving portion 53 is configured to receive a forward axial force from the nut 51 that is generated as the screw shaft 56 moves rearward during the fastening process, and transmit it to the anvil connecting sleeve 67. The front receiving portion 53 includes a flange sleeve 530 and a thrust bearing 535.

Flange sleeve 530 is generally a cylindrical body having a generally uniform inner diameter that is slightly larger than the outer diameter of threaded shaft 56 . The flange sleeve 530 includes a cylindrical tube portion 531 and a flange 533 that protrudes radially outward from one axial end of the tube portion 531. A portion of the cylindrical portion 531 adjacent to the flange 533 has a slightly larger outer diameter than other portions. That is, a stepped portion 532 is provided on the outer periphery of the cylindrical portion 531 adjacent to the flange 533. The outer diameter of the flange 533 is approximately equal to the inner diameter of the front portion 125 of the first housing 12 (specifically, the rear portion of the female threaded portion 126).

The flange sleeve 530 is arranged with the flange 533 at the front end, and is positioned by fitting the flange 533 into the front portion 125. As a result, the flange sleeve 530 is held in a state where its inner circumferential surface is spaced radially outward from the outer circumferential surface of the screw shaft 56. Note that the flange sleeve 530 contacts the first housing 12 only at the outer peripheral surface (that is, the radially outer end surface) of the flange 533, and does not contact the first housing 12 in the axial direction (front-back direction). do not have. The front end surface 534 of the flange 533 of the flange sleeve 530 is in contact with the rear end surface 673 of the anvil connecting sleeve 67 .

The thrust bearing 535 is disposed on the rear side of the flange 533 of the flange sleeve 530 and on the outside of the cylindrical portion 531 in the radial direction. The thrust bearing 535 includes a front bearing ring 536, a rear bearing ring 537, and a plurality of rolling elements 539 disposed between the front bearing ring 536 and the rear bearing ring 537.

The front bearing ring 536 is a stationary bearing ring that does not rotate together with the nut 51. The outer diameter of the front raceway ring 536 is approximately equal to the inner diameter of the front portion 125. On the other hand, the inner diameter of the front bearing ring 536 is slightly larger than the outer diameter of the stepped portion 532 of the cylindrical portion 531. The front bearing ring 536 is positioned by being fitted into the front portion 125 while in contact with the rear end surface of the flange 533 of the flange sleeve 530. Thereby, the front bearing ring 536 is held in a state in which its inner circumferential surface is spaced radially outward from the outer circumferential surface of the cylindrical portion 531 (stepped portion 532). Note that, like the flange sleeve 530, the front bearing ring 536 also contacts the first housing 12 only on its outer circumferential surface (that is, the radially outer end surface), and does not contact the first housing 12 in the axial direction (front-back direction). are not in contact.

The rear bearing ring 537 is a rotating bearing ring that rotates together with the nut 51. The outer diameter of the rear bearing ring 537 is smaller than the inner diameter of the front portion 125. On the other hand, the inner diameter of the rear bearing ring 537 is approximately equal to the outer diameter of the cylindrical portion 531 of the flange sleeve 530. The rear bearing ring 537 is rotatably fitted onto the outer periphery of the cylindrical portion 531, with the rolling elements 539 sandwiched between the rear bearing ring 537 and the front bearing ring 536. Thereby, the rear raceway ring 537 is held in a state in which its outer circumferential surface is spaced radially inward from the inner circumferential surface of the front portion 125. Note that the rear bearing ring 537 does not contact the first housing 12 not only on the outer circumferential surface (that is, the radially outer end surface) but also in the axial direction (front-back direction). The front end surface 513 of the nut 51 is in contact with the rear bearing ring 537.

The rolling elements 539 are rotatably held by the retainer 538 and are disposed between the front raceway 536 and the rear raceway 537 in the longitudinal direction. Note that in this embodiment, rollers (more specifically, cylindrical rollers) are employed as the rolling elements. The retainer 538 is fitted onto the outer periphery of the cylindrical portion 531 in a sliding manner. Further, the outer circumferential surface of the retainer 538 is spaced radially inward from the inner circumferential surface of the front portion 125.

As explained above, in the front side receiving part 53 of this embodiment, the flange 533 disposed between the anvil connecting sleeve 67 and the thrust bearing 535 in the front-rear direction, and the threaded shaft 56 and the thrust bearing 535 in the radial direction. A flange sleeve 530 having a cylindrical portion 531 disposed therebetween is employed. By using such a flange sleeve 530, the appropriate arrangement of the thrust bearing 535 with respect to the screw shaft 56, nut 51, anvil connection sleeve 67, and first housing 12 can be defined, and assembly can be facilitated. Can be done.

In this embodiment, the stepped portion 532 is provided in the cylindrical portion 531 of the flange sleeve 530, and the inner diameters of the front bearing ring 536 and the rear bearing ring 537 are made different to prevent mistakes when assembling the thrust bearing 535. This is to do so. Specifically, after fitting the flange sleeve 530 into the front portion 125 of the first housing 12, the assembling operator assembles the front bearing ring 536, the rolling elements 539 held in the retainer 538, and the rear bearing ring 537. It is necessary to package them on the cylindrical portion 531 in this order. If the operator mistakenly places the rear bearing ring 537 on the flange sleeve 530 first, the rear bearing ring 537 will be blocked by the stepped portion 532 and will not move forward to the original position of the front bearing ring 536. Can not. Therefore, according to the configuration of this embodiment, the operator can easily notice the mistake. However, the outer diameter of the cylindrical portion 531 of the flange sleeve 530 may be uniform, and the inner diameters of the front bearing ring 536 and the rear bearing ring 537 may be the same.

As shown in FIG. 4, the rear receiving portion 55 is connected to the rear end surface 514 of the nut 51 and the rear wall of the main housing 10 (specifically, the rear wall of the first housing 12) in the extending direction (front-back direction) of the drive shaft A1. ) is located between. The rear receiving portion 55 is configured to receive a rearward axial force from the nut 51 that is generated as the screw shaft 56 moves forward. The rear receiving portion 55 includes a thrust bearing 551. In this embodiment, the thrust bearing 551 employs a thrust needle bearing that uses needle rollers as rolling elements. This is because, in the fastening process, the forward axial force acting on the nut 51 when the screw shaft 56 returns to the front is smaller than when the screw shaft 56 moves backward and strongly pulls the pin.

The handle 17 will be explained below. As shown in FIG. 3, the handle 17 is a long cylindrical portion that extends downward continuously from the lower end of the central portion of the main body housing 10 in the front-rear direction. More specifically, the handle 17 protrudes downward from a portion of the main body housing 10 (specifically, the second housing 14) directly below the planetary reduction gear 300. This allows the user to grip the handle 17 at a position close to the center of gravity of the drive mechanism 3.

The handle 17 is a portion that is held by the user, and a trigger 171 that can be pulled by the user is provided at its upper end. A switch 172 is housed inside the handle 17. The switch 172 is normally maintained in an off state, and is turned on in response to a pulling operation of the trigger 171. The switch 172 is electrically connected to the control circuit 191 of the controller 19 by wiring (not shown), and outputs an on signal to the control circuit 191 when turned on.

Note that a long cylindrical hand guard 175 is provided in front of the handle 17. The hand guard 175 is spaced apart from the handle 17 and extends generally in the vertical direction, and connects the lower front end of the main body housing 10 (second housing 14) and the upper end of the battery housing 18. The hand guard 175 is provided to ensure the rigidity of the half body formed integrally with the second housing 14 etc., but in addition to this, it can protect the hand of the user who grips the handle 17. . Further, in this embodiment, an LED lamp 149 is held in an opening formed in the front wall of the second housing 14. Although detailed illustrations are omitted, the internal space of the hand guard 175 is used as a wiring path for connecting the LED lamp 149 and the controller 19.

The battery housing 18 will be explained below. As shown in FIG. 3, the battery housing 18 is configured as an inverted U-shaped hollow body that is long in the front-rear direction. The battery housing 18 has larger dimensions in the front-rear direction and left-right direction than the lower end portion of the handle 17. A controller 19 is housed in the battery housing 18 . The controller 19 includes a control circuit 191 that controls the fastening tool 101. In this embodiment, the control circuit 191 is composed of a microcomputer including a CPU, ROM, RAM, etc. Although detailed illustration is omitted, the control circuit 191 is mounted on a board housed in a case together with a drive circuit for the motor 2 and the like.

Two battery mounting parts 181 are provided at the lower end of the battery housing 18. Each battery attachment part 181 is configured to allow a battery 182 to be attached and detached thereto. That is, in this embodiment, two batteries 182 can be attached to the fastening tool 101. The battery 182 is a repeatedly rechargeable power source for supplying electric power to each part of the fastening tool 101 and the motor 2, and is also referred to as a battery pack. Note that since the configurations of the battery mounting section 181 and the battery 182 are well known, their explanations will be omitted. In this embodiment, the two battery mounting parts 181 are arranged in parallel in the front-back direction.

Battery housing 18 also includes a battery guard 185. The battery guard 185 is configured to protect the exposed portion of the battery 182 from external force when the battery 182 is attached to the battery attachment portion 181. In this embodiment, two battery guards 185 are provided on the front and rear sides of the two battery mounting sections 181, respectively. The two battery guards 185 are configured as parts of the battery housing 18 that protrude below the battery mounting parts 181 with the two battery mounting parts 181 in between.

Further, an operating section 187 is provided on the upper surface of the rear end portion of the battery housing 18. The operation unit 187 is an input device that can be operated externally by the user. Although detailed illustrations are omitted, in this embodiment, the operation unit 187 includes a plurality of push-button switches that can be operated by pressing. The operation unit 187 is also provided with a display unit that displays information. The user can input various information by pressing a switch on the operation unit 187.

As described above, in this embodiment, the fastening tool 101 is configured to be compatible with both tear-off type fasteners (for example, the fastener 8 shown in FIG. 1) and shaft-maintaining type fasteners. Control circuit 191 controls the drive of motor 2 according to the operating mode corresponding to the type of fastener used. Therefore, the user can input information specifying the operation mode via the operation unit 187. The operation unit 187 (switch) is electrically connected to the control circuit 191 of the controller 19 by wiring (not shown), and outputs a signal indicating the on/off state of each switch to the control circuit 191. Note that since the operating section 187 is provided near the controller 19, wiring during assembly of the fastening tool 101 is easy.

Hereinafter, a fastening operation of work materials using the fastening tool 101 will be explained.

First, the user temporarily fastens the fastener to be used (fastener 8 shown in FIG. 1 or other fastener) to the workpiece. Note that temporary fastening refers to inserting the shaft portion 811 of the pin 81 into a through hole formed in the workpiece W so that the head 815 of the fastener 8 comes into contact with one surface of the workpiece W, as illustrated in FIG. However, the collar 85 is loosely engaged with the shaft portion 811 from the opposite side of the workpiece W.

Further, the user attaches the nose assembly 61 to the fastening tool 101 according to the fastener to be used. Further, via the operation unit 187, an operating mode is specified depending on the type of fastener used. The operating portion 187 is disposed on the rear side of the handle 17 in a direction that allows it to be operated from above. Therefore, even when the user is holding the handle 17, the user can easily see and operate the operating section 187.

As shown in FIG. 3, in an initial state in which the trigger 171 is not pulled, the screw shaft 56 (that is, the drive shaft 560) and the jaw assembly 63 are located at the initial position (the forwardmost position). The user engages the tip of the anvil 62 with the collar of the temporarily fastened fastener (see FIG. 1), and loosely grips the shaft of the pin with the tip (claw) of the jaw assembly 63. When the user pulls the trigger 171 and the switch 172 is turned on, the control circuit 191 of the controller 19 starts driving the motor 2 in normal rotation. The increased torque is transmitted to the nut 51 via the planetary reducer 300, nut drive gear 311, and driven gear 511.

As shown in FIG. 7, as the nut 51 rotates, the screw shaft 56 is moved rearward. Accordingly, the jaw assembly 63 connected to the screw shaft 56 is pulled rearward, and the shaft portion of the pin is firmly gripped by the jaw assembly 63 and pulled rearward along the drive shaft A1. As a result, the collar is strongly pressed forward and radially inward and deformed, and is crimped onto the shaft portion while firmly holding the workpiece between the collar and the head of the pin. Note that a strong load is required to tighten the collar onto the shaft. This load acts on the nut 51 as a forward axial force (reaction force) via the jaw assembly 63, the jaw connecting member 66, and the screw shaft 56.

In contrast, in the present embodiment, the front receiving portion 53 shown in FIG. 6 receives the forward axial force from the nut 51 and transmits it to the anvil connecting sleeve 67 while allowing the nut 51 to rotate. More specifically, the axial force from the nut 51 is transmitted to the anvil connection sleeve 67 via the thrust bearing 535 (rear raceway ring 537, rolling elements 539, front raceway raceway 536) and the flange 533 of the flange sleeve 530.

As described above, each member of the thrust bearing 535 and the flange sleeve 530 do not contact the first housing 12 in the axial direction (front-back direction). Therefore, the axial force from the nut 51 is transmitted to the anvil connecting sleeve 67 by the front receiving portion 53 without passing through the first housing 12. Note that "without passing through the first housing 12" herein does not necessarily mean that the axial force transmitted via the first housing 12 is zero; It is sufficient that the axial force transmitted through the first housing 12 is negligibly small compared to the axial force transmitted to the connection sleeve 67.

In this manner, the forward axial force from the nut 51 acts on the anvil connecting sleeve 67 during crimping. On the other hand, the anvil 62 is pressed against the workpiece through the collar and receives a force in the backward direction. Therefore, the rear end surface of the locking flange 625 of the anvil 62 comes into contact with the front end surface of the anvil connecting sleeve 67 and presses the anvil connecting sleeve 67 rearward. As a result, the anvil 62 and the anvil connecting sleeve 67 are integrally subjected to a compressive force from both ends in the axial direction (front-back direction). At this time, the rear end surface 673 that comes into contact with the front end surface 534 of the flange 533 (surface contact) can receive force from the rear, which is preferable. On the other hand, substantially no forward axial force is applied to the first housing 12. Therefore, according to the front receiving portion 53 of this embodiment, forces in opposite directions act on the female threaded portion 126 of the first housing 12 and the male threaded portion 672 of the anvil connection sleeve 67, leading to loosening of the screws. The possibility can be reduced.

Further, as described above, the female threaded portion 126 and the male threaded portion 672 are threaded so that the tightening direction is opposite to the direction of rotation of the nut 51 when the screw shaft 56 is moved rearward. . Therefore, loosening of the screw due to rotation of the nut 51 can be prevented.

After the collar is crimped onto the shaft of the pin, the fastening of the workpiece is completed. Note that, as described above, in the fastening tool 101, the user specifies an operation mode according to the type of fastener to be used via the operation unit 187. The control circuit 191 specifies the operation mode based on the signal from the operation unit 187, stops normal rotation of the motor 2, and stops backward movement of the screw shaft 56 at a timing corresponding to the operation mode. Note that as a method for controlling the stoppage of backward movement of the screw shaft 56 according to the operation mode, for example, a method disclosed in Japanese Patent Application Laid-Open No. 2018-103257 can be adopted. After that, the control circuit 191 drives the motor 2 in reverse to move the screw shaft 56 forward, thereby returning the screw shaft 56 to its initial position.

In addition, in the shaft maintenance type fastener, since a strong load is applied when the collar is crimped to the pin, the collar is firmly crimped to the tip of the bore 621 of the anvil 62. Therefore, in order to move the jaw assembly 63 holding the shaft portion forward and detach the collar from the anvil 62, a correspondingly strong load is required. This load acts on the nut 51 as a rearward axial force via the jaw assembly 63, the jaw connecting member 66, and the threaded shaft 56. In contrast, in the present embodiment, while allowing the nut 51 to rotate, the rear receiving portion 55 (thrust bearing 551) receives the rearward axial force from the nut 51 and transmits it to the first housing 12. become.

[Second embodiment]
Hereinafter, with reference to FIG. 8, a fastening tool 102 according to a second embodiment will be described. The fastening tool 102 of this embodiment has a different front receiving part 54 from the fastening tool 101 of the first embodiment, but the other configurations are substantially the same as the fastening tool 101. Therefore, in the following, configurations that are substantially the same as those in the first embodiment will be denoted by the same reference numerals, illustrations and explanations will be omitted or simplified, and mainly different configurations will be described. Regarding this point, the same applies to other embodiments to be described later. Note that in FIG. 8, illustration of the jaw coupling member 66 and the nose assembly 61 is omitted.

As shown in FIG. 8, in this embodiment as well as in the first embodiment, the front receiving portion 54 is connected to the rear end surface 673 of the anvil connecting sleeve 67 and the nut 51 in the extending direction (front-rear direction) of the drive shaft A1. is arranged between the front end surface 513 of the anvil connecting sleeve 67 and receives the forward axial force from the nut 51 that is generated as the screw shaft 56 moves rearward during the fastening process, and transmits it to the anvil connecting sleeve 67. ing.

In this embodiment, the front receiving portion 54 includes only a thrust bearing 541. The thrust bearing 541 includes a front bearing ring 542, a rear bearing ring 544, and a plurality of rolling elements 547 arranged between the front bearing ring 542 and the rear bearing ring 544.

The front bearing ring 542 is a stationary bearing ring that does not rotate together with the nut 51. The outer diameter of the front raceway ring 542 is approximately equal to the inner diameter of the front portion 125. The inner diameter of the front bearing ring 542 is slightly larger than the outer diameter of the threaded shaft 56. The front bearing ring 542 is positioned by being fitted into the front portion 125. Thereby, the front raceway ring 542 is held in a state in which its inner circumferential surface is spaced radially outward from the outer circumferential surface of the screw shaft 56. The front bearing ring 542 is in contact with the first housing 12 only on the outer circumferential surface (that is, the radially outer end surface), and is not in contact with the first housing 12 in the axial direction (front-rear direction). In this embodiment, the rear end surface 673 of the anvil connection sleeve 67 is in contact with the front end surface 543 of the front raceway ring 542.

The rear bearing ring 544 is a rotating bearing ring that rotates together with the nut 51. The outer diameter of the rear raceway ring 544 is smaller than the inner diameter of the front portion 125. The inner diameter of the rear bearing ring 544 is slightly larger than the outer diameter of the threaded shaft 56. A recess 545 having approximately the same diameter as the outer diameter of the nut 51 is provided on the rear end surface of the rear bearing ring 544 . The rear bearing ring 544 is positioned by fitting the front end of the nut 51 into the recess 545. As a result, the rear raceway ring 544 is in a state in which its outer circumferential surface is spaced radially inward from the inner circumferential surface of the front portion 125 and its inner circumferential surface is spaced radially outward from the outer circumferential surface of the threaded shaft 56. is held in Note that the rear bearing ring 544 does not contact the first housing 12 not only on the outer circumferential surface (that is, the radially outer end surface) but also in the axial direction (front-back direction).

The rolling elements 547 are rotatably held by the retainer 546 and are arranged between the front bearing ring 542 and the rear bearing ring 544 in the front-rear direction. Note that in this embodiment as well, rollers (more specifically, cylindrical rollers) are employed as the rolling elements. The retainer 546 is fitted into the front portion 125 in a sliding manner. Further, the inner circumferential surface of the retainer 546 is spaced radially inward from the outer circumferential surface of the screw shaft 56.

Similarly to the first embodiment, also in the fastening tool 102 of this embodiment, the front receiving portion 54, that is, each member of the thrust bearing 541 does not contact the first housing 12 in the axial direction (front-back direction). Therefore, the axial force from the nut 51 is substantially transmitted to the anvil connection sleeve 67 by the front receiving portion 54 without passing through the first housing 12. Therefore, it is possible to reduce the possibility that forces in opposite directions will act on the female threaded portion 126 of the front portion 125 of the first housing 12 and the male threaded portion 672 of the anvil connection sleeve 67, leading to loosening of the screws. .

Moreover, the front side receiving part 54 of this embodiment can reduce the number of parts because the flange sleeve 530 is omitted compared to the front side receiving part 53 of the first embodiment (see FIG. 6). Furthermore, by omitting the cylindrical portion 531 of the flange sleeve 530 disposed between the screw shaft 56 and the first housing 12 in the radial direction, the distance from the drive shaft A1 to the upper surface of the first housing 12 (so-called center height) can be reduced.

[Third embodiment]
Hereinafter, with reference to FIG. 9, a fastening tool 103 according to a third embodiment will be described. The fastening tool 103 of this embodiment has a hand guard 176 having a different configuration from the fastening tool 101 of the first embodiment, but the other structure is substantially the same as the fastening tool 101.

As shown in FIG. 9, in this embodiment, instead of the intake port 145 (see FIG. 2) provided in the main body housing 10 (second housing 14) in the first embodiment, a cylindrical hand guard 176 has a A plurality of intake ports 177 are provided. Further, a partition wall 178 is provided inside the hand guard 176. The partition wall 178 is provided above the intake port 177 and divides the internal space of the hand guard 176 into a lower region where the intake port 177 is arranged and an upper region that communicates with the main body housing 10 (second housing 14). are doing.

In the fastening tool 103 of this embodiment, when the motor 2 is driven and the fan 27 rotates, the air flows into the hand guard 176 from the intake port 177, passes through the inside of the battery housing 18 and the handle 17, and enters the second housing 14. An airflow is generated that exits from the exhaust port 146 (see FIG. 2). Therefore, not only the motor 2 but also the controller 19 housed in the battery housing 18 can be cooled by this air flow. In this manner, in this embodiment, the hand guard 176 is effectively utilized to form a cooling air flow path for the motor 2 and the controller 19.

The correspondence between each component of the above embodiment and each component of the present invention is shown below. However, each component of the embodiment is merely an example, and does not limit each component of the present invention. Each of fastening tools 101, 102, and 103 is an example of a "fastening tool." The fastener 8, pin 81, and collar 85 are examples of a "fastener," a "pin," and a "cylindrical portion," respectively. The drive shaft A1 is an example of a "first shaft." The main body housing 10 is an example of a "housing". The handle 17 is an example of a "handle". Anvil 62 is an example of an "anvil." Jaw assembly 63 is an example of a "pin gripper." The motor 2 is an example of a "motor". The drive mechanism 3 is an example of a "drive mechanism." Nut 51 and driven gear 511 are examples of a "rotating member" and a "driven gear", respectively. The screw shaft 56 is an example of a "moving member." The rotation axis A2 is an example of a "second axis." The nut drive gear 311 is an example of a "drive gear." Idle gear 331 is an example of an "idle gear."

The planetary reducer 300 is an example of a "planetary reducer." The first housing 12 is an example of a "first housing." The second housing 14 is an example of a "second housing". Reduction gear assembly 30 is an example of a "reduction gear assembly." The seal member (O-ring) 137 is an example of a "seal member". Motor region 141 and shaft region 142 are examples of a "first region" and a "second region", respectively. The partition wall 143 is an example of a "partition wall."

In addition, the said embodiment is a mere illustration, and the fastening tool based on this invention is not limited to the structure of the illustrated fastening tools 101, 102, and 103. For example, changes exemplified below can be made. Note that any one or a plurality of these modifications may be employed in combination with the fastening tools 101, 102, 103 shown in the embodiment or the invention described in each claim.

For example, each of the fastening tools 101, 102, and 103 can selectively use a plurality of types of multi-member crimping fasteners by replacing the nose assembly 61. Additionally, the fastening tools 101, 102, 103 may be capable of using known fasteners of the type referred to as blind rivets (or rivets) by replacing the nose assembly 61. Note that a blind rivet is composed of a pin and a cylindrical portion (also referred to as a sleeve or a rivet body) that are integrally formed. Similar to tear-off type multi-member crimping fasteners, the pin tails of blind rivets are torn off during the fastening process.

Further, the fastening tools 101, 102, and 103 are specialized machines that are compatible with only one type of tear-off type multi-member crimping fasteners, shaft-maintaining type multi-member crimping fasteners, and blind rivets. It may be. In addition, in a dedicated machine, the configuration of the main body housing 10 and the drive mechanism 3, and the control mode by the control circuit 191 may be changed as appropriate depending on the type of each fastener. For example, in a dedicated machine for a shaft-maintaining type multi-member crimping type fastener, pintails do not occur, so the pintail passage and collection container 148 formed in the threaded shaft 56 and the like may be omitted. Further, in a special machine for a tear-off type multi-member crimping fastener or a blind rivet, the thrust bearing 551 disposed on the rear side of the nut 51 may be omitted.

The configuration, material, etc. of the nose assembly 61 (anvil 62 and jaw assembly 63) and the nose adapter 65 (anvil connection sleeve 67, jaw connection member 66, fixing ring 68) may be changed as appropriate.

For example, the shape of the anvil 62 and the manner in which it is connected to the main body housing 10 may be changed. Depending on the shape of the anvil 62, the shape of the anvil connecting sleeve 67 can also be changed as appropriate. Further, the anvil 62 may be directly screwed into the female threaded portion 126 without using the anvil connecting sleeve 67. In this case, the rear end portion of the anvil 62 may be configured in the same manner as the male threaded portion 672.

Similarly, the shape of the jaw assembly 63 and the manner in which it is connected to the threaded shaft 56 may be changed. The jaw assembly 63 may be directly connected to the threaded shaft 56 without using the jaw connecting member 66. The jaw assembly 63 may be configured such that the gripping force on the pin changes as the plurality of claws move in the radial direction in conjunction with relative movement in the front-back direction with respect to the anvil 62. The shape, number, etc. may be changed as appropriate.

The configurations of the front receiving parts 53 and 54 may be changed as appropriate. For example, the front bearing ring 536 of the thrust bearing 535 may be omitted, and the flange 533 of the flange sleeve 530 may also serve as the bearing ring. The rear bearing ring 537 of the thrust bearing 535 may be integrated into the nut 51. The same applies to the rear bearing ring 544 of the thrust bearing 541. Balls may be used as the rolling elements 539 and 547 instead of rollers. Further, another member (for example, a washer) that does not contact the gear housing 12 in the axial direction (front-back direction) may be further disposed between the rear end surface 673 of the anvil connecting sleeve 67 and the front end surface 513 of the nut 51. good. Note that similar changes can be made to the configuration of the thrust bearing 551 of the rear receiving portion 55.

The configuration and arrangement of the motor 2, drive mechanism 3, controller 19, operating section 187, etc. may be changed as appropriate.

For example, instead of the brushless motor, a brushed motor may be used as the motor 2, or an AC motor driven by power supplied from an external AC power source may be used. In the above embodiment, the motor main body 21 is disposed on the rear side of the rear end of the nut 51 in the front-rear direction, but like the planetary reducer 300, the motor main body 21 is , the rear portion of the drive gear 511). Moreover, the motor 2 does not necessarily need to be arranged coaxially with the planetary reducer 300 and the first intermediate shaft 31. For example, the rotation axis A2 of the motor shaft 23 may be parallel to the axes of the planetary reducer 300 and the first intermediate shaft 31. Furthermore, the motor 2 may be arranged such that the rotation axis A2 of the motor shaft 23 intersects the drive axis A1.

In the drive mechanism 3, instead of the ball screw mechanism 5, a feed screw mechanism including a nut and a screw shaft directly engaged with the nut may be employed. The number of stages of the planetary reducer 300 (that is, the number of planetary gear mechanisms included in the planetary reducer 300) and the configuration of the planetary gear mechanism in each stage may be changed as appropriate. For example, the planetary reducer 300 may include two, or four or more planetary gear mechanisms. Further, in the power transmission path, a gear reducer including a gear train other than a planetary gear mechanism (a gear train such as a spur gear, helical gear, bevel gear, etc.) is installed between the motor 2 and the nut drive gear 311 instead of the planetary reducer 300. may be placed.

The controller 19 may be housed in the main body housing 10 instead of the battery housing 18. Further, in the above embodiment, an example is given in which the control circuit 191 is configured by a microcomputer including a CPU and the like. However, the control circuit 191 may be configured with a programmable logic device such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

The input device for inputting information specifying the operation mode is not limited to the push-button switch of the operation unit 187, and may be, for example, a slide switch, a rotary dial, or a touch panel. The information input from the operation unit 187 is not limited to information regarding the operation mode. For example, the information may be information regarding the type of fastener and/or working material, the desired pulling force, the speed of movement of the threaded shaft 56 (pulling speed), the environmental temperature, and the like. Furthermore, the operating section 187 may be provided at another location (for example, in the main body housing 10) or may be omitted.

Depending on or regardless of the change in the internal mechanism described above, the configuration, arrangement, material, etc. of the main body housing 10, handle 17, hand guards 175, 176, and battery housing 18 may be changed as appropriate.

For example, the first housing 12 and the second housing 14 may be integrally formed, or may have different shapes. Also, reducer assembly 30 need not be separable from first housing 12. That is, the reducer case 13 may be configured integrally with the first housing 12. Further, the first housing 12 may be formed by connecting a plurality of parts different from those in the above embodiment. Similarly, the second housing 14 does not need to be molded integrally with the handle 17, hand guards 175, 176, and battery housing 18 from resin. At least one of these may be formed separately and connected to the remaining parts by screws or the like. Hand guards 175 and 176 may be omitted.

The number of battery mounting sections 181 (that is, the number of batteries 182 that can be mounted) may be one, or may be three or more. Furthermore, the position of the battery mounting portion 181 is not limited to the lower part of the battery housing 18. Battery guard 185 may be omitted.

Furthermore, in view of the spirit of the present invention and the above embodiments, the following aspects are constructed. At least one of the following aspects may be employed in combination with one or more of the above-described embodiments and modifications thereof, and the inventions described in each claim.
[Aspect 1]
The idle gear is rotatable around a third axis,
The third axis extends in the vertical direction between the first axis and the second axis and in parallel with the first axis and the second axis.
The rotation axis A3 is an example of the "third axis" of this aspect.
[Aspect 2]
The first axis, the second axis, and the third axis are located on the same plane.
[Aspect 3]
The second housing has an opening that communicates the outside of the second housing with the first region, and the opening is an intake port or an exhaust port for cooling air of the motor.
Each of the intake port 145 and the exhaust port 146 is an example of an "opening" in this aspect.
[Aspect 4]
Equipped with a plurality of battery mounting parts each configured to allow batteries to be attached and detached,
The plurality of battery mounting portions are arranged below the handle in the front-rear direction.
The battery mounting section 181 is an example of the "battery mounting section" of this aspect.
[Aspect 5]
The second housing accommodates at least a portion of the first housing.
[Aspect 6]
The second housing accommodates the reduction gear case.

101, 102, 103: Fastening tool, 10: Main body housing, 12: First housing, 121: Front wall, 122: Rear wall, 123: Recessed part, 125: Front part, 126: Female thread part, 127: Rear part, 13 : Reduction gear case, 131: Front wall, 133: Projection, 137: Seal member, 14: Second housing, 141: Motor area, 142: Shaft area, 143: Partition wall, 145: Intake port, 146: Exhaust port, 147 : opening, 148: collection container, 149: LED lamp, 16: nose, 17: handle, 171: trigger, 172: switch, 175, 176: hand guard, 177: intake port, 178: bulkhead, 18: battery housing , 181: Battery mounting section, 182: Battery, 185: Battery guard, 187: Operation section, 19: Controller, 191: Control circuit, 2: Motor, 3: Drive mechanism, 5: Ball screw mechanism, 8: Fastener, 21: Motor main body, 23: Motor shaft, 27: Fan, 30: Reducer assembly, 300: Planetary reducer, 302: Sun gear, 303: Carrier, 31: First intermediate shaft, 311: Nut drive gear, 33: No. 2 intermediate shaft, 331: idle gear, 51: nut, 511: driven gear, 513: front end surface, 514: rear end surface, 521, 522: bearing, 53: front receiving part, 530: flange sleeve, 531: cylindrical part, 532: Step portion, 533: Flange, 534: Front end surface, 535: Thrust bearing, 536: Front bearing ring, 537: Rear bearing ring, 538: Cage, 539: Rolling element, 54: Front receiving part, 541: Thrust bearing, 542: Front bearing ring, 543: Front end surface, 544: Rear bearing ring, 545: Recess, 546: Cage, 547: Rolling element, 55: Rear receiving part, 551: Thrust bearing, 56: Screw Shaft, 560: Drive shaft, 561: Extension shaft, 61: Nose assembly, 62: Anvil, 621: Bore, 625: Locking flange, 63: Jaw assembly, 65: Nose adapter, 66: Jaw connecting member, 661: Large diameter section, 663: Seal member, 67: Anvil connecting sleeve, 671: Bore, 672: Male thread section, 673: Rear end surface, 675: Flange, 68: Fixing ring, 81: Pin, 811: Shaft section, 815: Head, 85: Collar, A1: Drive shaft, A2: Rotation shaft, A3: Rotation shaft, W: Work material

Claims (5)

A fastening tool configured to fasten a workpiece through a fastener including a pin and a cylindrical part,
a housing extending along a first axis that defines the front-rear direction of the fastening tool;
a handle protruding from the housing in a direction intersecting the first axis;
an anvil configured to abut on the cylindrical portion of the fastener and connected to the front end of the housing so as to extend along the first axis;
a pin gripping part configured to be able to grip the pin and held movably along the first axis with respect to the anvil;
a motor housed in the housing;
a drive mechanism that is at least partially housed in the housing, is driven by the power of the motor, and is configured to move the pin gripping portion in the front-rear direction with respect to the anvil;
The drive mechanism is
a rotating member having a driven gear provided on an outer periphery and supported by the housing so as to be rotatable around the first axis;
a moving member connected to the pin gripping portion, engaged with the rotating member, and configured to be linearly moved in the front-rear direction by rotation of the rotating member;
A direction perpendicular to the first axis and corresponding to the extending direction of the handle is defined as an up-down direction of the fastening tool, and in the up-down direction, a direction in which the handle protrudes from the housing is defined as a downward direction. If specified, the motor is arranged on a second axis extending parallel to the first axis below the first axis, and is rotated about the second axis by the power of the motor. a drive gear configured to;
an idle gear that meshes with the drive gear and the driven gear,
The housing includes:
a first housing that accommodates at least the rotating member, the drive gear, and the idle gear;
A fastening tool comprising a second housing that houses at least the motor and a portion of the moving member. The fastening tool according to claim 1 ,
The drive mechanism further includes a planetary reducer disposed between the motor and the drive gear in the power transmission path,
The planetary reducer constitutes a reducer assembly together with a case housing the planetary reducer,
A fastening tool, wherein the speed reducer assembly is removably coupled to the first housing. The fastening tool according to claim 2 ,
A fastening tool, wherein a sealing member is disposed between the speed reducer assembly and the first housing. The fastening tool according to claim 2 or 3 ,
The fastening tool is characterized in that the handle protrudes from a portion of the housing directly below the planetary reducer. The fastening tool according to any one of claims 1 to 4 ,
The internal space of the second housing includes a first region in which the motor is housed, and a second region in which at least a portion of the moving member is housed,
The fastening tool is characterized in that the first region and the second region are separated by a partition wall.

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