JP2003247502A - Electrically-powered hydraulic tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrically-powered hydraulic tool capable of confirming whether or not release of hydraulic pressure is properly performed by operating an oil pressure release lever in a state in which a hydraulic pump 3 and a driving motor 1 are installed on a transmission unit 2 and also lessening mulfunction of an oil pressure release function of the electrically-powered hydraulic tool. <P>SOLUTION: The electrically-powered hydraulic tool is provided with a transmission unit 2 comprising a hydraulic pump 3 having a hydraulic plunger 31 for feeding oil by pressurizing by reciprocating in an oil pressure chamber 32, and hydraulic pressure release valve 35 releasing the hydraulic pressure of the fed oil, a reduction mechanism 22 transmitting the revolution of a driving shaft 11 of the driving motor 1 by reducing speed and an eccentric cam mechanism 23, both of which mechanisms are provided between the hydraulic pump 3 and driving motor 1. The cam mechanism 23 converts the reduced revolution in the reduction mechanism 22 into a reciprocating motion of the hydraulic plunger 31 of the hydraulic pump 3. The hydraulic pressure release lever 8 is oscillatorily installed on the transmission unit 2, and an hydraulic pressure release pin 24, which pushes the release valve 35 of the hydraulic pump 3 to open by oscillation of the release lever 8, is slidably installed on the transmission unit 2. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hydraulic tool for performing operations such as crimping. 2. Description of the Related Art FIG. 3 shows a configuration example of a conventional electric hydraulic crimping tool for performing a crimping operation. The electric hydraulic crimping tool includes a drive motor 1, a transmission 2, and a hydraulic pump 3.
The drive motor 1 is a tool outer case 4 for an electric hydraulic crimping tool.
An electric commutator motor that rotates the drive shaft 11 using the battery 5 housed in the handle portion 41 protruding downward from the lower end of the motor. The drive motor 1 is attached and fixed to the right end face of the transmission case 21 of the transmission 2 in the figure. [0003] The transmission 2 includes a reduction mechanism 22 and an eccentric cam mechanism 23 inside a transmission case 21. The speed reduction mechanism 22 is a planetary gear mechanism that transmits the rotation of the drive shaft 11 of the drive motor 1 at a reduced speed.
The eccentric cam 23a
Is converted into a reciprocating operation by The hydraulic pump 3 reciprocates a hydraulic plunger 31 in a hydraulic chamber 32 so as to pressurize oil drawn from an oil tank 33 to a pressure cylinder 34 and send it out. The hydraulic plunger 31 has a piston-shaped upper part fitted into a cylinder-shaped hydraulic chamber 32 and is sealed by an O-ring and a backup ring so as to be slidable in the vertical direction. It protrudes downward from the cylindrical pump block. The hydraulic pump 3 has a crimping cylinder 3
4 is provided with a hydraulic pressure release valve 35 for releasing the hydraulic pressure inside. The hydraulic pressure release valve 35 is a check valve that prevents the movement of oil from the press-fit cylinder 34 to the oil tank 33, and is mounted on the pump block of the hydraulic pump 3 with an O-ring sealed so as to be slidable in the vertical direction. When pressed against the upper end of the valve stem 36, the check valve is opened and the oil in the crimping cylinder 34 is returned to the oil tank 33 so that the oil pressure can be released. The lower end of the valve stem 36 also slightly protrudes downward from the pump block of the hydraulic pump 3 at the tip of the left side of the hydraulic plunger 31 in the drawing, and the lower end protruding is pushed upward to forcibly push the hydraulic release valve 35. Can be opened. [0005] The hydraulic pump 3 is mounted and fixed with the lower end surface of a pump block placed on the upper end surface of a transmission case 21 of the transmission 2. The lower end of the hydraulic plunger 31 of the hydraulic pump 3 projecting downward from the pump block fits into the eccentric cam mechanism 23 from the upper end opening of the transmission case 21 and reciprocates up and down by rotation of the eccentric cam 23a. It is supposed to work. Therefore,
When the electric hydraulic crimping tool presses a trigger switch 6 pivotally attached to the handle portion 41 with a finger, a switch (not shown) is turned on, and the drive shaft 11 of the drive motor 1 is driven to rotate. Reduction mechanism 22 and eccentric cam mechanism 2
3, the hydraulic plunger 31 of the hydraulic pump 3 is reciprocated up and down. Then, when the oil in the oil tank 33 is pressurized by the reciprocating operation of the hydraulic plunger 31 and sent to the press-fitting cylinder 34, the press-fitting piston 37 advances to the left, and a crimping tool (not shown) attached to the tip of the press-fitting piston 37. The crimping operation is performed by pressing the crimp terminal or the like. A hydraulic pressure release lever 7 is attached to the electric hydraulic pressure bonding tool. The hydraulic pressure release lever 7 can swing around a support shaft 71 fixed to the left end of the transmission 2 inside the tool outer case 4 as a fulcrum, and the lower end is urged leftward by the torsion coil spring 72 and ,
The hydraulic pressure release button 73 attached to the lower end portion is located below the trigger switch 6 of the handle portion 41. Further, the hydraulic pressure release lever 7 is
The upper end of the transmission 2 attached to and fixed to the hydraulic pump 3 contacts the lower end of the valve stem 36 projecting downward from the pump block at the left end of the transmission 2. When the hydraulic pressure release button 73 is pressed with a finger against the urging of the pressure, the upper end of the hydraulic pressure release lever 7 pushes up the valve stem 36 to forcibly open the hydraulic pressure release valve 35 to cause the oil in the crimp cylinder 34 to be opened. Can be released. [0007] However, the hydraulic pressure release valve 35 of the hydraulic pump 3 is operated by the press-fitting cylinder 34 during the press-fitting operation.
Since the valve stem 36 is pressed by an extremely high force, it cannot be opened unless the valve stem 36 is pushed up with an extremely strong force, and the hydraulic pressure is not released even if the hydraulic pressure release button 73 is pressed after the assembly of the electric hydraulic crimping tool is completed. Defective products were sometimes generated. The reason why the hydraulic pressure cannot be released is not only that the hydraulic pressure release valve 35 and the valve stem 36 are defective, but also that the support shaft 7 serving as a fulcrum of the hydraulic pressure release lever 7
In some cases, the valve stem 36 cannot be accurately pressed even when the hydraulic pressure release button 73 is pressed because the position precision of the position 1 fixed to the tool outer case 4 is poor. For this reason, the conventional electric hydraulic crimping tool disassembles the once completed electric hydraulic crimping tool and replaces the hydraulic pump 3 or adjusts the hydraulic release lever 7 when the failure that the hydraulic pressure is not released occurs. It is necessary to reassemble, and there has been a problem that productivity is significantly reduced. In the conventional electric hydraulic crimping tool, a hydraulic pressure release lever 7 is separately assembled at the stage of finally assembling a unit formed by assembling the hydraulic pump 3 and the drive motor 1 into the transmission 2 and finally assembling the tool outer case 4. And the workability of the assembly is poor. The above problem is not limited to the electric hydraulic crimping tool for performing the crimping operation, but is also common to other electric hydraulic tools for performing the cutting operation and the like. The present invention has been made in order to cope with such a situation. By attaching a hydraulic pressure release lever to a transmission, the hydraulic pressure release function can be confirmed in a state where a hydraulic pump and a drive motor are assembled to the transmission. It is an object of the present invention to provide an electric hydraulic tool capable of performing the following. A first aspect of the present invention is a hydraulic plunger that pressurizes and sends oil by reciprocating in a hydraulic chamber, and a hydraulic release valve that releases the oil pressure of the sent oil. And a reduction mechanism for transmitting the rotation of the drive shaft of the drive motor at a reduced speed between the hydraulic pump and the drive motor, and applying the rotation reduced by the reduction mechanism to the reciprocating operation of the hydraulic plunger of the hydraulic pump. In an electric hydraulic tool equipped with a transmission having a rotary reciprocating conversion mechanism for converting, a hydraulic release lever is attached to the transmission so as to be swingable, and the hydraulic release lever is pressed by the swing of the hydraulic release lever so that the hydraulic pump is A hydraulic release pin for pushing and opening the hydraulic release valve is slidably mounted. According to the first aspect of the present invention, by operating the hydraulic release lever attached to the transmission to swing the hydraulic release pin, the hydraulic release pin is slid to open the hydraulic release valve of the hydraulic pump and release the hydraulic pressure. Therefore, it is possible to confirm whether the hydraulic pressure can be released normally by operating the hydraulic pressure release lever in a state where only the hydraulic pump and the drive motor are attached to the transmission. Further, since the hydraulic pressure release lever is swingably attached to the transmission device and only needs to press the hydraulic pressure release pin attached to the transmission device, there is no danger that the mounting position accuracy will deteriorate. Further, the hydraulic pressure release pin can reliably push and open the hydraulic pressure release valve depending on the mounting accuracy of the transmission and the hydraulic pump. In this case, too, there is almost no possibility that the mounting position accuracy will deteriorate. In addition, since the hydraulic pressure release lever presses the hydraulic pressure release valve via the hydraulic pressure release pin, the lever from the swing fulcrum to the operating unit can be short by the length of the hydraulic pressure release pin. Not only the space can be reduced, but also a stable swing operation can be performed. Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing the structure of an electric hydraulic crimping tool, and FIG. 2 is a detailed structure of a transmission device in the electric hydraulic crimping tool. FIG. Components having the same functions as those of the conventional example shown in FIG. 3 are denoted by the same reference numerals. In this embodiment, an electric hydraulic crimping tool similar to the conventional example will be described. This electric hydraulic crimping tool also includes a drive motor 1, a transmission 2, and a hydraulic pump 3. The configurations of the drive motor 1 and the hydraulic pump 3 are exactly the same as in the conventional example. The transmission 2 includes a speed reduction mechanism 22 and an eccentric cam mechanism 2 having the same configuration as in the prior art inside a transmission case 21.
3 is provided. The speed reduction mechanism 22 includes the transmission device case 2
Drive motor 1 attached to and fixed to the right end face of FIG.
And a two-stage planetary gear mechanism for transmitting the rotation of the drive shaft 11 at a reduced speed. That is, as shown in FIG. 2, the reduction mechanism 22 includes a first sun gear 22 a fitted on the drive shaft 11 of the drive motor 1, and an internal gear 22 b fixed on the inner peripheral surface of the transmission case 21. A plurality of first planetary gears 22 meshed between the first sun gear 22a and the internal gear 22b.
c, the rotation of the drive shaft 11 is reduced and transmitted to a first disk 22d to which these planetary gears 22c are rotatably mounted, respectively, and formed at the left end of the first disk 22d in the drawing. The second planetary gears 22f are rotatably mounted by a second sun gear 22e and a plurality of second planetary gears 22f inserted between the second sun gear 22e and the internal gear 22b. 2nd disk 2
The rotation of the first disk 22d is further reduced and transmitted to 2g. The eccentric cam mechanism 23 converts the rotation decelerated by the reduction mechanism 22 into a reciprocating operation by the eccentric cam 23a. That is, the eccentric cam mechanism 23 is provided with a large-diameter eccentric cam 23a eccentric with respect to the axis of the rotating shaft at the center of the rotating shaft, and the rotating shafts on both sides of the eccentric cam 23a are connected to the transmission case 21. Are rotatably supported by two bearings 23b and 23c having an outer ring fixed to an inner peripheral hole of the inner ring. However, the right bearing 23c
The outer ring is fixed to the inner peripheral hole of the transmission case 21 via a spacer for convenience of assembly. Eccentric cam 23a
Has an outer ring 23e rotatably fitted to the outer peripheral surface thereof via a number of needles 23d. The tip of the rotating shaft protruding to the right of the eccentric cam 23a is fitted to the second disk 22g of the speed reduction mechanism 22 so that the rotation reduced by the speed reduction mechanism 22 is transmitted. Accordingly, when the drive shaft 11 of the drive motor 1 is rotationally driven, the rotation reduced by the reduction mechanism 22 is transmitted to the eccentric cam 23a, and the upper end of the outer peripheral surface of the outer ring 23e is rotated by the rotation of the eccentric cam 23a. Reciprocate up and down with the The hydraulic pump 3, which has the lower end surface of the pump block mounted and fixed on the upper end surface of the transmission device case 21 of the transmission device 2, has a lower end of a hydraulic plunger 31 projecting downward from the pump block. 2 is arranged at the upper end of the outer peripheral surface of the outer ring 23e of the eccentric cam mechanism 23 in FIG. Therefore, the upper end of the outer peripheral surface of the outer ring 23e reciprocates up and down with the rotation of the eccentric cam 23a, so that the hydraulic plunger 31 also moves up and down.
As a result, the oil in the oil tank 33 of the hydraulic pump 3 is pressurized and sent to the pressure bonding cylinder 34. The transmission case 21 of the transmission 2 is
An inner diameter hole for accommodating the speed reduction mechanism 22 and the eccentric cam mechanism 23 in a cylindrical aluminum die cast having a closed left end face,
A part requiring accuracy, such as an upper end surface to which the hydraulic pump 3 is attached and fixed, is additionally processed. This transmission case 2
1, a through hole 21a penetrating in the vertical direction
Is formed. A hydraulic pressure release pin 24 is fitted into the through hole 21a so as to be slidable up and down. The through hole 21 a is formed so as to be located directly below a valve stem 36 protruding downward from a pump block of the hydraulic pump 3 fixed to the transmission case 21. In practice, the through hole 21a is vertically separated by a sufficiently wide cast-out portion 21b communicating with the inner diameter hole of the transmission case 21. The lower end portion has a larger hole diameter. The lower end of the hydraulic pressure release pin 24 is also formed with a large shaft diameter, and is inserted into the through hole 21a from below to fit into the upper and lower end holes, respectively. I have. Further, when the hydraulic pressure release pin 24 is inserted, the hydraulic pressure release pin 24 is urged downward by externally fitting the compression coil spring 25 at the middle cast-out portion 21b above and below the through hole 21a. It has become. Therefore, when the hydraulic release pin 24 is slid upward against the bias of the compression coil spring 25, the upper end of the hydraulic release pin 24 pushes the valve stem 36 of the hydraulic pump 3 upward. A support shaft 21c is fixed to the lower end on the left side of the transmission case 21. The support shaft 21c is
This is a horizontal shaft having both ends fixed to a projection at the lower end on the left side of the transmission case 21. The upper end of the hydraulic release lever 8 is pivotally supported by the support shaft 21c. The hydraulic pressure release lever 8 is a lever whose lower end can swing right and left about the support shaft 21c as a fulcrum, and a hydraulic pressure release button 81 is attached to this lower end. The hydraulic pressure release button 81 is located below the trigger switch 6 of the handle portion 41 when the hydraulic pressure release lever 8 is incorporated into the tool outer case 4 of the electric hydraulic crimping tool together with the transmission 2 and the like, as shown in FIG. It has become. When the hydraulic pressure release button 81 is pushed rightward, the hydraulic pressure release lever 8 swings around the support shaft 21c, and the upper end acts as a lever to push the lower end of the hydraulic pressure release pin 24 to lift it upward. Also, since the hydraulic pressure release pin 24 is normally urged downward by the compression coil spring 25, the hydraulic pressure release button 81 is located on the left side within the swing range of the hydraulic pressure release lever 8. However, in the present embodiment, since the valve stem 36 is normally pushed downward by the hydraulic pressure release valve 35, the hydraulic pressure release pin 24 is
, The hydraulic pressure release button 81 is located on the left side. The transmission case 2 of the transmission 2 having the above configuration
When the drive motor 1 is attached and fixed to the right end face of the drive motor 1 and the hydraulic pump 3 is attached and fixed to the upper end face of the transmission case 21, the power is connected to the drive motor 1 to rotate the drive motor 1 as in the conventional example. The hydraulic pump 3
The operation can be confirmed by pressurizing the oil to the pressure cylinder 34 and feeding the oil to advance the pressure piston 37 to the left. In addition, in the case of the present embodiment, since the hydraulic pressure release lever 8 is attached to the transmission 2, the hydraulic pressure of the oil in the crimping cylinder 34 can be released by pressing the hydraulic pressure release button 81. . That is, when the hydraulic release button 81 is pressed, the hydraulic release pin 24 is lifted upward by the upper end of the hydraulic release lever 8, and the valve stem 36 of the hydraulic pump 3 is pushed upward by the upper end of the hydraulic release pin 24. The hydraulic pressure release valve 35 is opened, and the oil in the pressure cylinder 34 is returned to the oil tank 33. Thus, the operation of the hydraulic pressure release function by the hydraulic pressure release lever 8 can be confirmed. On the other hand, in the conventional example shown in FIG. 3, the hydraulic release lever 7 is assembled to the tool outer case 4 separately from the transmission 2, drive motor 1 and hydraulic pump 3 unit. In order to confirm that the hydraulic pressure release valve 35 of the hydraulic pump 3 operates normally, it is necessary to confirm by pressing the valve stem 36 with a tool or the like after assembling the unit. However, since the valve stem 36 requires a strong pressing force, it is not only troublesome to confirm the operation of pressing the valve stem 36 with a tool or the like, but even if the operation is confirmed to be normal here, the transmission device When the hydraulic pressure release lever 7 incorporated in the case 21 is operated, the valve stem 36
Is too heavy, and the hydraulic pressure release lever 7 cannot be pushed up sufficiently. Further, even if the hydraulic pressure release valve 35 and the valve stem 36 are normal, if the hydraulic pressure release lever 7 is assembled and operated, the valve stem 36 fixed to the transmission case 21 has a poor position accuracy or the like. In some cases, it could not be pushed up with sufficient force, and until the assembly of the electric hydraulic crimping tool was completed, it was not possible to confirm the exact hydraulic release function according to the actual operation. Further, according to the present embodiment, the through holes 21a
The precision of the formation position of the shaft and the mounting position of the support shaft 21c can be precisely controlled by the processing accuracy of the transmission case 21, so that it is only possible to confirm whether or not the hydraulic release lever 8 normally lifts the hydraulic release pin 24 by operation. In addition, the possibility of occurrence of the operation failure can be sufficiently reduced. Since the transmission 2 and the hydraulic pump 3 are mounted and fixed so that the eccentric cam mechanism 23 and the hydraulic plunger 31 have an accurate positional relationship, the through-hole 21a formed in the transmission case 21 and the hydraulic Pump 3
The projecting position of the valve stem 36 is also accurately positioned, and not only can the operation confirm whether the valve stem 36 normally opens the hydraulic release valve 35 by raising the hydraulic release pin 24, but also this operation failure occurs. The possibility can also be reduced sufficiently. Further, according to this embodiment, the length of the hydraulic pressure release lever 8 shown in FIG.
Can be shortened by almost the length of the hydraulic pressure release pin 24, so that the operating space when the hydraulic pressure release lever 8 swings can be reduced, and also the hydraulic pressure release button 81
Can be stabilized by pushing with a finger. Further, even if the length of the hydraulic pressure release lever 8 is reduced, the length between the support shaft 21c and the upper end of the hydraulic pressure release lever 8 is reduced as in the present embodiment. It also eliminates the need for a greater force to lift the arm than before. In the above embodiment, the case where the transmission device case 21 of the transmission device 2 is made of aluminum die-casting has been described. However, the material and manufacturing method of the transmission device case 21 are arbitrary. In the above embodiment, the transmission 2
A case where a planetary gear mechanism is used as the speed reduction mechanism 22 is shown, but any transmission mechanism that reduces the speed of the rotation of the drive shaft 11 of the drive motor 1 and transmits the reduced speed may be, for example, a combination of ordinary spur gears. There may be. Further, in the above embodiment, the case where the eccentric cam mechanism 23 is used for the transmission 2 has been described. However, the rotation reciprocating conversion mechanism that converts the rotation reduced by the reduction mechanism 22 into the reciprocating operation of the hydraulic plunger 31 of the hydraulic pump 3 is used. If so, for example, a device using a normal cam or a device using a crank mechanism may be used. In the above-described embodiment, the case where the check valve is used as the hydraulic pressure release valve 35 of the hydraulic pump 3 has been described.
If the valve is opened by being pushed by the hydraulic pressure release pin 24, it is not necessarily required to be a check valve. Further, in the above embodiment,
Although the case where the hydraulic pressure release pin 35 presses the valve stem 36 to open the hydraulic pressure release valve 35 is shown, the hydraulic pressure release valve 35 may be opened via a mechanism other than the valve stem 36, and the hydraulic pressure release valve 35 may be opened. It is also possible to configure so that the hydraulic pressure release valve 35 is opened directly by pushing the tip of the pin 24. In the above embodiment, the hydraulic pressure release pin 2
4 shows a case where the through-hole 21a for penetrating through 4 is formed by being vertically divided via the cast-out portion 21b. This is because if a long through-hole 21a is formed in a casting where the cast-out portion 21b is not formed, the through-hole 21a may be bent and formed due to the flow at the time of cutting by a drill. Therefore, the upper and lower through holes 21a of this embodiment
Is drilled separately from the outer periphery side,
Opened coaxially with mechanical precision. However, instead of forming the cast-out portion 21b, protrusions may be provided on the outside of the left end surface of the transmission case 21 and through-holes 21a divided into these protrusions may be formed. However, if the bending of the through-hole 21a does not cause a problem or if a straight hole can be formed, the transmission case 21 without the cast-out portion 21b can be used. Further, in the above embodiment, the electric hydraulic crimping tool for performing the crimping operation has been described. However, if the electric hydraulic tool is operated by the hydraulic pressure generated by the hydraulic pump 3 driven by the drive motor 1, the cutting operation can be performed. The same can be applied to other tools for performing such operations. As is apparent from the above description, according to the electric hydraulic tool of the present invention, the hydraulic pressure release lever is operated while the hydraulic pump and the drive motor are merely attached to the transmission. It is possible to confirm whether the release of the hydraulic pressure can be normally performed, and it is also possible to reduce the failure of the release function of the hydraulic pressure, so that the productivity can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows one embodiment of the present invention, and is a longitudinal sectional view showing a structure of an electric hydraulic crimping tool. FIG. 2, showing an embodiment of the present invention, is a partially enlarged longitudinal sectional view showing a detailed structure of a transmission device in an electric hydraulic crimping tool. FIG. 3 shows a conventional example, and is a longitudinal sectional view showing a structure of an electric hydraulic crimping tool. [Description of Signs] 1 Drive motor 11 Drive shaft 2 Transmission 21 Transmission case 21a Through hole 21c Support shaft 22 Reduction mechanism 23 Eccentric cam mechanism 23a Eccentric cam 24 Hydraulic release pin 3 Hydraulic pump 31 Hydraulic plunger 32 Hydraulic chamber 33 Oil tank 34 Crimping cylinder 35 Hydraulic release valve 36 Valve stem 37 Crimping piston 8 Hydraulic release lever 81 Hydraulic release button

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Yoshiyasu Mochizuki             3039 Sasaga, Matsumoto City, Nagano Prefecture             Izumi Seiki Factory F-term (reference) 3H089 AA05 CC01 DA02 DB33 EE41                       GG02 JJ20                 3J070 AA03 BA90 CB02 CC01 DA17                       EA01                 5E063 CA01 CC04 CD02 CD22

Claims (1)

Claims: 1. A hydraulic pump having a hydraulic plunger for pressurizing and sending oil by performing reciprocating operation in a hydraulic chamber, and a hydraulic release valve for releasing the oil pressure of the sent oil. A speed reduction mechanism for transmitting the rotation of the drive shaft of the drive motor at a reduced speed between the drive motor and a rotation reciprocating conversion mechanism for converting the rotation reduced by the speed reduction mechanism into a reciprocating operation of a hydraulic plunger of the hydraulic pump; The hydraulic release tool is provided with a transmission device equipped with a hydraulic release lever which is swingably mounted on the transmission device, and which is pressed by the swing of the hydraulic release lever to open the hydraulic release valve of the hydraulic pump. An electric hydraulic tool, wherein a pin is slidably mounted.