CN109590950B

CN109590950B - Hammering tool

Info

Publication number: CN109590950B
Application number: CN201811150045.1A
Authority: CN
Inventors: 陆巧男; 孙井龙; 毋宏兵; 朱伯元
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2017-09-30
Filing date: 2018-09-29
Publication date: 2022-07-12
Anticipated expiration: 2038-09-29
Also published as: EP3461593A1; CN109590950A; DE18197782T1

Abstract

The invention provides a hammering tool. The hammering tool of the present invention comprises: a motor having a motor shaft; the output shaft and the motor shaft form an included angle, and the output shaft is used for accommodating the working head; a transmission mechanism disposed between the motor shaft and the output shaft; the hammering mechanism is used for providing hammering force for the working head; a first housing for housing the hammer mechanism and at least part of the output shaft; the second shell is connected with the first shell and used for supporting the transmission mechanism; the third shell is connected with the second shell and used for accommodating at least part of the motor; the transmission mechanism comprises a first intermediate shaft for driving the hammering mechanism, the first intermediate shaft is provided with a first end close to the motor and a second end far away from the motor, the first end of the first intermediate shaft is fixedly supported on the second shell, and the second end of the first intermediate shaft is arranged to be a cantilever. The electric hammer is light in weight and flexible to use.

Description

Hammering tool

Technical Field

The invention relates to the field of electric tools, in particular to a hammering tool.

Background

With the continuous development of science and technology, electric tools such as electric hammers have higher working efficiency and more flexible use, and more appear in civil engineering and other operations.

At present, electric hammers are generally used for work in order to cope with building materials having high strength such as concrete and brick walls. The electric hammer generally comprises a shell, structural components such as a gear reduction box, a middle cover and the like, and moving components such as a motor, a transmission mechanism and the like, wherein the motor and the transmission mechanism are relatively fixed by the middle cover, the transmission mechanism is arranged in a cavity defined by the gear reduction box and the middle cover, the middle shaft in the transmission mechanism is fixed and supported by the gear reduction box, and in order to bear a large amount of alternating load generated by the middle shaft during rotation or impact, the gear reduction box and the middle cover are generally made of high-strength metal so as to ensure the positioning reliability of the middle shaft.

However, the existing electric hammer has large mass, is not beneficial to being held by a single hand of an operator or being operated by adopting high posture, and is limited to be used in a plurality of complicated civil construction occasions.

Disclosure of Invention

The invention provides a hammering tool which is light in weight and flexible to use.

In a first aspect, the present invention provides a hammering tool comprising:

a motor having a motor shaft for outputting power;

the output shaft and the motor shaft form an included angle, and the output shaft is used for accommodating the working head;

the hammering mechanism is used for providing hammering force for the working head;

the transmission mechanism is arranged between the motor shaft and the output shaft and is used for transmitting power to the hammering mechanism;

a first housing for receiving at least part of the hammer mechanism;

the second shell is connected with the first shell and used for supporting the transmission mechanism;

the third shell is connected with the second shell and used for accommodating at least part of the motor;

the transmission mechanism comprises a first intermediate shaft used for driving the hammering mechanism, the first intermediate shaft is provided with a first end close to the motor and a second end far away from the motor, the first end of the first intermediate shaft is fixedly supported on the second shell, and the second end of the first intermediate shaft is arranged into a cantilever.

In a second aspect, the present invention provides a hammering tool comprising:

a motor having a motor shaft for outputting power; (ii) a

the hammering mechanism is used for providing a hammering force transmission mechanism for the working head, is arranged between the motor shaft and the output shaft and is used for transmitting power to the hammering mechanism;

a first housing accommodating at least a part of the output shaft;

the transmission mechanism comprises a first intermediate shaft used for driving the hammering mechanism, the first intermediate shaft is parallel to the motor shaft, the first shell and the third shell are made of plastic, and the second shell is made of metal.

The hammering tool of the present invention includes a motor having a motor shaft; the output shaft and the motor shaft form an included angle, and the output shaft is used for accommodating the working head; the transmission mechanism is arranged between the motor shaft and the output shaft; the hammering mechanism is used for providing hammering force for the working head; a first housing for housing at least part of the hammer mechanism; the second shell is connected with the first shell and used for supporting the transmission mechanism; the third shell is connected with the second shell and used for accommodating at least part of the motor; the transmission mechanism comprises a first intermediate shaft used for driving the hammering mechanism, the first intermediate shaft is provided with a first end close to the motor and a second end far away from the motor, the first end of the first intermediate shaft is fixedly supported on the second shell, and the second end of the first intermediate shaft is arranged to be a free end, so that the first intermediate shaft is arranged to be a cantilever structure. Through supporting drive mechanism's first intermediate shaft on the less second casing of volume like this, can reduce the structure weight that has the first casing of great volume, when guaranteeing the normal work of hammering instrument, can show the weight that reduces whole instrument to let the realization one-hand that the operator can relax hold or the operation of high machine position.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a peening tool provided in accordance with an embodiment of the present invention;

FIG. 2 is a partial schematic view of the transmission of FIG. 1;

FIG. 3 is a schematic structural diagram of a peening tool according to an embodiment of the present invention;

FIG. 4 is an exploded view of a peening tool provided in accordance with an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first housing in a hammering tool according to an embodiment of the present invention.

Description of reference numerals:

1-a motor;

2-an output shaft;

3, a transmission mechanism;

4-a hammering mechanism;

5-a first housing;

6-a second housing;

7-a third housing;

8, connecting pieces;

11-motor shaft;

21-working head;

31 — a first intermediate shaft;

32 — a second intermediate shaft;

51-a separator;

52-a through hole;

61-a containing groove;

62-an accommodating cavity;

71-an insert;

111. 312, 521, 621-bearings;

112-pinion gear;

311-eccentric wheel;

312 — a first gear;

321 — second gear.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

The hammering tool is a common electric tool and can be applied to civil engineering occasions with high hardness, such as concrete and masonry structures, and the like, and difficult construction of common electric drills. In order to drill into the building materials with high hardness, the hammering tool is provided with a pneumatic hammering mechanism besides a common electric drill bit, and can realize rotary hammering operation. Specifically, the pneumatic hammering mechanism mainly utilizes the principle of piston motion, and impacts the drill bit through compressed gas to enable the drill bit to impact the surface to be drilled. Typically, the hammering tool can make holes in concrete or masonry material of 6mm to 100mm diameter. Hereinafter, the hammering tool provided by the present invention will be described in detail by way of specific examples.

Example one

Fig. 1 is a schematic cross-sectional view of a peening tool according to an embodiment of the present invention. Fig. 2 is a partial schematic view of the transmission mechanism of fig. 1. Fig. 3 is a schematic structural diagram of a hammering tool according to an embodiment of the present invention. Fig. 4 is an exploded view of a peening tool provided in accordance with an embodiment of the present invention. Fig. 5 is a schematic structural diagram of a first housing in a hammering tool according to an embodiment of the present invention. As shown in fig. 1 to 5, the hammering tool provided in this embodiment may specifically include the following components and structures:

a motor 1 having a motor shaft 11;

the output shaft 2 is arranged at an included angle with the motor shaft 11, and the output shaft 2 is used for accommodating the working head 21;

a transmission mechanism 3 provided between a motor shaft 11 and the output shaft 2;

the hammering mechanism 4 is used for providing hammering force for the working head 21, and comprises an output shaft 2, a piston accommodated in the output shaft 2, a ram intermittently impacted by the piston and a ram intermittently impacted by the ram;

a first housing 5 for accommodating at least part of the hammer mechanism 4, wherein the output shaft 2 is partially exposed from the first housing 5;

a second housing 6 connected to the first housing 5 for supporting the transmission mechanism 3;

a third housing 7 connected to the second housing 6 for accommodating at least a part of the motor 1;

the transmission mechanism 3 includes a first intermediate shaft 31 for driving the hammer mechanism 4, the first intermediate shaft 31 has a first end close to the motor 1 and a second end far from the motor 1, the first end of the first intermediate shaft 31 is fixed and supported on the second housing 6, and the load applied to the first intermediate shaft 31 is shared by the second housing 6, and the second end of the first intermediate shaft 31 is arranged as a cantilever.

Specifically, the hammering tool in the embodiment includes a motor 1 for driving a working head to rotate, the motor 1 has a motor shaft 11, the motor shaft 11 outputs power to the hammering tool through rotation of the motor shaft 11, so that the working head 21 in the hammering tool is rotated, or hammering force is partially or completely provided to the working head 21 through a hammering mechanism 4, so as to realize hammering movement.

The output shaft 2 is used for accommodating the working head 21 and driving the working head 21 to rotate. The axis of the output shaft 2 and the axis of the motor shaft 11 in the motor 1 are not parallel, but form an angle with each other, so that the motor 1 is not located in the direction of the extension line of the output shaft 2, but located at one side of the output shaft 2, for example, near the bottom of the hammering tool, at this time, the output shaft 2 and the working head 21 are both located at the front end of the hammering tool, and the motor 1 is located at the bottom of the rear end of the hammering tool, and the whole hammering tool is in a vertical structure.

Wherein, as an alternative embodiment, the included angle between the output shaft 2 and the motor shaft 11 is between 80 ° and 100 °, and preferably, the output shaft 2 and the motor shaft 11 are perpendicular to each other, which can ensure that the hammering tool has a shorter length and a more compact structure.

In addition, the hammering tool can also comprise a plurality of shells with different shapes and structures, wherein a first shell 5 for accommodating at least part of the hammering mechanism 4 is included; a second housing 6 for supporting the transmission 3, and a third housing 7 for housing at least part of the motor 1.

The second housing 6, the first housing 5 and the third housing 7 can be connected together by a connecting member or the like to form a complete housing structure.

Since the first housing 5 can be used to accommodate and protect at least a part of the hammering mechanism 4, the first housing is generally a box-type structure with a hollow cavity, and the hammering mechanism 4 and all or at least a part of the output shaft 2 are disposed inside the hollow cavity of the first housing 5. Thus, in order to accommodate the hammer mechanism 4 while matching the angle between the output shaft 2 and the motor shaft 11, the first housing 5 is generally in an "L" shape, and one end of the "L" shape is parallel or co-directional with the output shaft for accommodating all or part of the output shaft 2, while the other end of the "L" shape faces the lower part of the hammer tool and is used for connecting with the second housing 6 and the like.

The second housing 6 serves as a main supporting member of the transmission mechanism 3, and can bear most of the rotation and alternating load of the transmission mechanism 3, so that unstable conditions such as play and the like of the transmission mechanism 3 due to the influence of the load are avoided. The second housing 6 may have a simpler shape, such as a middle cover with a smaller thickness and a simpler structure, and the second housing 6 as the middle cover may be connected to the bottom end of the first housing 5 and together with the first housing 5 enclose a cavity for accommodating the hammering mechanism 4 and other components. The first housing 5 and the second housing 6 may be connected by a connecting member 8 or the like, and the connecting member 8 may be a screw or the like, and the screw connects the first housing 5 and the second housing 6 together in a direction parallel to the motor shaft 11.

The third housing 7 can cover the surface of the motor 1 and house at least a portion of the motor 1 to protect the motor 1, so that it is generally a thin shell structure with less force bearing.

In order to connect the output shaft 2 and the motor shaft 11, the hammering tool comprises a transmission mechanism 3, and the transmission mechanism 3 can realize the connection transmission and power output between the output shaft 2 and the motor shaft 11 through a transmission structure such as an intermediate shaft and a gear.

Specifically, the transmission mechanism 3 usually includes a plurality of intermediate shafts, and different intermediate shafts can be used to output rotary power to the output shaft 2 or drive the hammering mechanism 4 to hammer. Wherein, drive mechanism 3 includes first jackshaft 31 for driving hammer mechanism 4, and first jackshaft 31 has the first end that is close to motor 1 and keeps away from the second end of motor 1, and the first end of first jackshaft 31 is fixed support on second casing 6, and the second end of first jackshaft 31 sets up to the cantilever.

Since the second end of the first intermediate shaft 31 is not connected to the first housing 5, but is arranged as a cantilevered arm that is suspended, the suspended second end of the first intermediate shaft 31 does not transmit load to the first housing 5 when it is subjected to alternating loads. Typically, the transmission mechanism 3 further includes an eccentric wheel 311 disposed at the second end of the first intermediate shaft 31, or other eccentric structure for generating a circular motion around the axis of the first intermediate shaft 31, wherein the eccentric wheel 311 is disposed eccentrically with respect to the axis of the first intermediate shaft 31, and the first intermediate shaft 31 and the second housing 6 are fixed relatively, and the eccentric wheel 311 can generate a circular rotation under the driving of a transmission mechanism such as a gear. The eccentric wheel 311 is connected with connecting pieces such as a swing rod, so that the connecting pieces such as the swing rod can be driven to swing under the drive of the circumferential rotation of the eccentric wheel 311, the circumferential motion of the eccentric wheel 311 is converted into the linear reciprocating motion of parts in the hammering mechanism 4, a piston in the hammering mechanism 4 is driven to circularly move in a cylinder, gas is compressed, and the gas can generate the pneumatic hammering force of circular reciprocating in the periodic compression process, and the hammering force can be applied to the working head 21, so that the working head 21 can generate a hammering effect on the surface to be drilled, and the drilling capability is improved. Optionally, in order to ensure that the eccentric wheel 311 can freely rotate relative to the first intermediate shaft 31, a bearing 312 is usually further provided between the first intermediate shaft 31 and the eccentric wheel 311.

In order to respectively execute the operations of drilling, hammering and combination of drilling and hammering, the hammering tool has different working modes, and under the different working modes, the intermediate shaft and different transmission parts can be connected or disconnected through switching of the clutch mechanism, so that the intermediate shaft can respectively drive the corresponding transmission parts and the working head 21 to rotate or generate one or more of linear reciprocating motions under the driving of the rotation of the motor shaft 11, and the hammering tool can accordingly execute the corresponding drilling or hammering function.

Alternatively, to support the first intermediate shaft 31, the second housing 6 is typically a hard structure made of a high strength material. Thus, when the first intermediate shaft 31 is loaded, most of the load borne by the first intermediate shaft can be transferred to the second shell 6, and therefore good supporting and unloading effects can be achieved. Therefore, the first intermediate shaft 31 can realize stable rotation, the power output is smooth, and the safety is good.

Since the second housing 6 needs to bear the high-strength alternating load generated when the hammering device 4 moves through the first intermediate shaft 31, the second housing 6 is usually made of metal to ensure good mechanical properties and high strength; since the first intermediate shaft 31 is cantilevered and there is no connection to the first housing 5, the first housing 5 experiences less alternating loading from the first intermediate shaft 31. At this time, the main function of the first housing 5 is to form a sealed cavity to protect the hammer mechanism 4, the output shaft 2 and other moving parts, and to fix and support the transmission mechanism 3. Therefore, the first shell 5 and the third shell 7 can be made of plastics which have certain bearing performance and light weight. Compared with the prior art that the output shaft and the hammering mechanism are protected by using the shell structures such as the reduction box shell and the like which are made of metal and have larger volumes, the first shell 5 made of the light plastic material has the overall volume and the wall thickness which are close to or consistent with each other, but the weight is greatly reduced.

The plastic can be made of two components of nylon and glass fiber, can also be made of two components of nylon and carbon fiber, or other components. Preferably, the plastic can be synthesized by two components of nylon and glass fiber, wherein the glass fiber accounts for 45% of the total components, and the nylon accounts for 55% of the total components, so that the strength of the plastic can be higher, and the strength requirement of the hammering tool during working can be met. Because plastics have advantages such as weight is lighter, chemical stability is good, easy machine-shaping, and under the light weight of self, plastics still can guarantee certain mechanical properties, so can be when guaranteeing that the quality is lighter for realize location and fixed to each drive disk assembly in the first casing 5 and motor 1 in the third casing 7.

Generally, the second housing 6 may be made of a magnesium alloy material or an aluminum alloy material. The magnesium alloy and the aluminum alloy have good mechanical properties, high strength and light weight. And the second housing 6 may be a cap-like structure, i.e., a middle cap, connected between the first housing 5 and the third housing 7. When the second shell 6 made of aluminum alloy or magnesium alloy material is adopted as the hammering tool, the whole weight of the hammering tool can be further reduced, and the use flexibility and the portability of the hammering tool are improved.

In this way, the first intermediate shaft 31 is fixed to the second housing 6 and supported by the second housing 6, and when the eccentric wheel 311 and the like on the first intermediate shaft 31 drive the hammering mechanism 4 to perform hammering, the alternating load of the hammering mechanism 4 acting against the first intermediate shaft 31 is borne and absorbed by the second housing 6, and the first housing 5 only needs to ensure that the hammering mechanism 4 is fixed in position, and the borne load is small. Like this because first casing 5 no longer need bear great load, therefore be case shell structure, the great first casing 5 of volume can adopt comparatively light material to make, and only need guarantee the volume account for the load bearing capacity of less second casing 6 can, can show the weight that reduces whole hammering instrument like this to let realization one-hand that the operator can relax hold or the hammering operation of high machine position.

In order to support the first countershaft 31, as an alternative embodiment, at least one end of the first countershaft 31 is connected to the second housing 6. Since the second housing 6 is normally connected between the transmission 3 and the motor 1, the second housing 6 is normally located at one side of the whole of the transmission 3. In order to support the first intermediate shaft 31, the second housing 6 can be connected to at least one end of the first intermediate shaft 31 and can support the first intermediate shaft 31 and carry the load of the first intermediate shaft 31 solely from the end.

Similarly, if there are several countershafts in the gear mechanism 3, the other countershafts can be supported and fixed in a similar manner, or the second housing 6 can be used together with other components to fix and support the countershafts.

For positioning and fixing the first intermediate shaft 31 and the other intermediate shafts, a fixing structure is provided on the second housing 6, and the first intermediate shaft 31 is fixed on the fixing structure and is fixedly connected with the fixing structure, for example, by interference fit or the like. While the eccentric 311 connected to the end of the first intermediate shaft 31 is rotatable relative to the second housing 6 to drive a hammering tool to hammer, the fixing structure may be a hole, groove or cavity or the like to fix the end of the first intermediate shaft 31 therein. Specifically, the second housing 6 may be provided with a receiving groove 61, and the receiving groove 61 is used for receiving the first end of the first intermediate shaft 31.

In the hammering tool of the present embodiment, an included angle exists between the motor shaft 11 and the output shaft 2, the first intermediate shaft 31 of the transmission mechanism 3 is generally parallel or approximately parallel to the axis of the motor shaft 11, and the eccentric wheel 311 on the first intermediate shaft 31 and the motor shaft 11 are generally engaged through gears to realize transmission rotation. In order to position and support the motor shaft 11, a shaft hole through which the motor shaft 11 of the motor 1 passes is opened in the second housing 6, and the accommodation groove 61 is located at a side of the shaft hole.

Typically, the motor 1 is located below the second housing 6, and the motor shaft 11 of the motor 1 extends out of the second housing 6 through the shaft hole and into the cavity region inside the first housing. The first intermediate shaft 31, which is disposed in parallel with the motor shaft 11, is fixed to the accommodation groove 61 located at the side of the shaft hole. The distance between the receiving groove 61 and the shaft hole may be set according to the distance between the first intermediate shaft 31 and the motor shaft 11.

Wherein, the size and the shape of the shaft hole are matched with the size and the shape of the motor shaft 11, so that the motor shaft 11 can be fixed through the shaft hole. For example, the size of the shaft hole may match the shaft diameter of the motor shaft 11 of the motor 1 to limit the radial displacement of the motor shaft 11. Since the motor shaft 11 needs to be driven by rotation, a bearing 111 may be generally disposed between the shaft hole and the motor shaft 11 to allow the motor shaft 11 to rotate freely in the shaft hole. The bearing 111 located in the shaft hole may be a rolling bearing, a sliding bearing, or the like. In addition, in order to limit the axial displacement of the motor shaft 11, a limit structure such as a step surface or a protrusion is generally provided in the shaft hole of the second housing 6.

Meanwhile, generally, because the transmission mechanism 3 may be provided with substances which are easy to leak, such as grease, etc., some sealing structures, such as sealing rings or gaskets, etc., are usually provided in the shaft holes.

Specifically, the notch direction of the accommodating groove 61 generally faces the first intermediate shaft 31, so that the end portion of the first intermediate shaft 31 is placed into the accommodating groove 61 through the notch, and after the end portion of the first intermediate shaft 31 is inserted into the accommodating groove 61, the fixing of the accommodating groove 61 can be obtained, so that the alternating load generated by the rotation of the first intermediate shaft 31 can be transmitted to the second housing 6 through the accommodating groove 61, and then the second housing 6 is transferred to the whole hammering tool, so that the first intermediate shaft 31 can be effectively positioned and fixed and can disperse the received load.

Specifically, as shown in fig. 2, a ratio of the depth H of the accommodating groove 61 to the total height H of the first intermediate shaft 31 is generally greater than or equal to 1/3, so as to ensure that the first intermediate shaft 31 can be stably fixed by the accommodating groove 61 without shaking or the like. Preferably, the ratio of the height of the receiving groove 61 to the total height of the first intermediate shaft 31 is 1/2. This enables the first intermediate shaft 31 to be stably supported by the accommodating groove 61, while the second housing 6 can maintain a small thickness and volume weight, which is advantageous for reducing the weight of the hammering tool.

An insert 71 is disposed between the first intermediate shaft 31 and the accommodating groove 61, and the insert 71 is sleeved on the first intermediate shaft 31. Preferably, the insert 61 is a metal material, such as a steel material. In the present embodiment, the insert 71 is integrally formed with the first intermediate shaft 31, and is inserted into the accommodating groove 61 together when assembled. The provision of the insert 61 both makes the mounting of the first intermediate shaft 31 more stable and also contributes to the reduction of the load on the first housing 5, so that the alternating load of the hammer mechanism 4 acting against the first intermediate shaft 31 is largely absorbed by the second housing 6.

Furthermore, in order to drive the tool head 21 in rotation for the drilling operation of the hammer mechanism 4, the transmission mechanism 3 further comprises a second intermediate shaft 32 for driving the output shaft 2 in rotation, the second intermediate shaft 32 having a first end close to the motor 1 and a second end remote from the motor 1, the first end of the second intermediate shaft 32 being movably supported on the second housing 6, and the second end of the second intermediate shaft 32 being movably supported on the first housing 5.

The second intermediate shaft 32 needs to rotate around the shaft center so as to drive the output shaft 2 to rotate. Generally, when the length of the second intermediate shaft 32 is long, one end of the second intermediate shaft 32 is usually fixed to the second housing 6, and the other end of the second intermediate shaft 32 is fixed and connected by the first housing 5 or other structures, because the volume and thickness of the second housing 6 are generally small.

In order to avoid interference between mechanisms, the first intermediate shaft 31 and the second intermediate shaft 32 are generally arranged on two sides of the motor shaft 11, the first intermediate shaft 31 and the second intermediate shaft 32 both obtain power from the motor shaft 11 through transmission modes such as gear engagement, the first intermediate shaft 31 obtains power generated by the motor 1 through the engagement of the first gear 312 and the pinion 112 on the motor shaft 11, the second intermediate shaft 32 obtains power generated by the motor 1 through the engagement of the second gear 321 and the pinion 112 on the motor shaft 11, and then the power is transmitted to corresponding components through connection between other components and structures, so that rotation and impact of the working head 21 are respectively realized.

Normally, the axial directions of the second intermediate shaft 32 and the motor shaft 11 are both arranged in the vertical direction, and the motor shaft 11 and the motor 1 are normally arranged in the lowermost region of the hammer mechanism 4, while the transmission mechanism 3, the first housing 5, and the like are arranged above the motor 1. When one end of the second intermediate shaft 32 is connected to the second housing 6, the bottom end of the second intermediate shaft 32 is usually connected to the second housing 6, i.e., the middle cover, since the second housing 6 is located between the motor 1 and the transmission mechanism 3. Thus, the bottom end of the second intermediate shaft 32 is movably supported on the second housing 6, and the top end of the second intermediate shaft 32 is movably supported on the first housing 5 and connected to the transmission mechanism 3 or the output shaft 2.

In this embodiment, the first intermediate shaft 31, the second intermediate shaft 32, and the motor shaft 11 are located on the same plane, and the gear centers of the first gear 312, the second gear 321, and the pinion gear 112 are located on a straight line. The arrangement can ensure that the stress is uniform when each gear is meshed with the motor shaft, thereby prolonging the service life of the gears.

Optionally, in order to receive the end of the second intermediate shaft 32, the second housing 6 may be provided with a receiving cavity 62, and a connecting member is provided between the second intermediate shaft 32 and the receiving cavity 62. The receiving cavity 62 is similar to the receiving cavity 61 in structure and shape, and has an opening facing the second intermediate shaft 32, so that the end of the second intermediate shaft 32 can enter the receiving cavity 62 from the opening and be received in the receiving cavity 62. In order to ensure the movable connection between the second intermediate shaft 32 and the accommodating cavity 62, a connecting member is arranged between the second intermediate shaft 32 and the accommodating cavity 62, and the connecting member can ensure that the second intermediate shaft 32 can freely rotate relative to the cavity wall of the accommodating cavity 62.

The connecting member may be in various different forms and structures, as long as the connecting member can fix the second intermediate shaft 32 in the accommodating cavity 62, and at the same time, the free rotation between the second intermediate shaft 32 and the accommodating cavity 62 is realized, which is not limited in this embodiment.

As one of the possible embodiments, the connection member may be a bearing 621. Since second intermediate shaft 32 needs to remain rotatably disposed within receiving cavity 62, a bearing 621 is typically disposed between receiving cavity 62 and the end of second intermediate shaft 32. The interior of the receiving cavity 62 now forms a bearing chamber for receiving the bearing 621. The outer ring of the bearing 621 is generally directly connected with the cavity wall of the accommodating cavity 62, the inner ring of the bearing 621 is sleeved outside the end part of the second intermediate shaft 32, and the inner ring and the outer ring of the bearing 621 can be in sliding connection or can be in rolling connection through balls or roller pins. So that the second intermediate shaft 32 and the second housing 6 can be kept stationary and relatively rotatable by the bearing 621.

The bearing 621 for connecting the second intermediate shaft 32 and the receiving cavity 62 may be of various types, for example, when the bearing 621 is a rolling bearing, it may be a deep groove ball bearing, a needle bearing, or a tapered roller bearing.

When the working head 21 is driven to realize the drilling operation, the second intermediate shaft 32 always rotates around the rotating shaft thereof under the power of the motor 1, so that the second intermediate shaft 32 can directly drive the output shaft 2 to rotate through the transmission modes such as gear connection and the like so as to perform the drilling operation.

In order to avoid the situation that the normal operation of the transmission mechanism 3 is affected by the inclination, the overturn, the transverse movement and the like of the second intermediate shaft 32, a structure for assisting and fixing the second intermediate shaft 32 needs to be arranged on the first housing 5. Specifically, the first housing 5 may be provided with a partition plate 51, and the partition plate 51 is provided with a through hole 52 for the second intermediate shaft 32 to pass through. Since the second intermediate shaft 32 can be fixed by the through hole 52 of the partition plate 51, the second intermediate shaft 32 can be supported by two independent bearing points at different positions along the axial direction of the second intermediate shaft, so that the second intermediate shaft can keep a stable posture during rotation, and the situations of inclination, overturning, transverse movement and the like are avoided. Because one end of the second intermediate shaft 32 is fixed by the second housing 6, the first housing 5 only needs to be used for stabilizing the posture of the second intermediate shaft 32 and avoiding the second intermediate shaft 32 from turning over, the load borne by the partition plate 51 and the through hole 52 is small, and even if the first housing 5 is made of plastic, the stable support of the second intermediate shaft 32 can be ensured.

Specifically, the partition plate 51 may be fixedly connected to different portions of the second intermediate shaft 32. Since the spacer 51 is primarily used to resist the moment of tilting and yawing of the second intermediate shaft 32 about the end, the amount of force required by the spacer 51 is minimal when the force applied by the spacer is at the end of the second intermediate shaft 32, based on the lever principle. Thus, as an alternative, the partition 51 is articulated with the end of the second intermediate shaft 32 remote from the second housing 6. Thus, the first housing 5 and the second housing 6 can be fixed to both end portions of the second intermediate shaft 32, respectively, and support and position the second intermediate shaft 32.

In order to position the second intermediate shaft 32, the first housing 5 may specifically include a partition plate 51, and the partition plate 51 is provided with a through hole 52 through which the second intermediate shaft 32 can pass. The second intermediate shaft 32 can thus pass through the through-opening 52 and be positioned and connected between the partition 51 and the first housing 5. Generally, the direction of the partition plate 51 is staggered with the axial direction of the second intermediate shaft 32 or even perpendicular to the axial direction, so that the direction of the through hole 52 formed in the partition plate 51 is consistent with the direction of the second intermediate shaft 32, and a good fixing effect can be achieved.

Optionally, the edge of the partition 51 is generally connected to the wall of the first housing 5, or directly forms a part of the wall of the first housing 5, so that lateral force or torque applied to the partition 51 can be transmitted to the first housing 5, and the second intermediate shaft 32 can be fixed and positioned to the first housing 5 through the partition 51, with a good positioning effect.

Optionally, the partition 51 may be integrally formed with the first housing 5, or may be detachably disposed in a separate manner.

In general, the partition 51 may be a flat plate or an arc plate having a certain curvature. For example, the partition plate 51 is generally located at a lower position of the first housing 5 and matches the shape of the lower portion of the first housing 5.

The second intermediate shaft 32 needs to be kept in a rotating state when the hammering tool performs a drilling operation, and in order to ensure that the second intermediate shaft 32 can normally rotate and avoid the influence of the first housing 5, a bearing 521 may be provided between the through hole 52 in the partition plate 51 and the second intermediate shaft 32, similar to the shaft hole in the second housing 6. The outer ring of the bearing 521 is generally directly connected with the hole wall of the through hole 52, the inner ring of the bearing 521 is sleeved on the outer side of the second intermediate shaft 32, and the inner ring and the outer ring of the bearing 521 can be in sliding connection or rolling connection. Thus, the second intermediate shaft 32 can be kept in relative rotation with the through hole 52 by the bearing 521, and is movably supported on the first housing 5.

The bearings 521 provided in the through holes 52 may also be of different types, such as deep groove ball bearings, needle bearings, or tapered roller bearings. The type and size of bearing 521 can be selected accordingly based on the dimensions of second intermediate shaft 32 and the characteristics of the load to be carried.

In order to dispose the bearing 521 in the through hole 52 of the partition plate 51, a mounting structure for mounting the bearing 521 may be generally disposed on the through hole 52. As one of alternative structures, one end of the through hole 52 may form a receiving cavity for receiving the bearing 521. Specifically, different ends of the through hole 52 in the axial direction have different apertures, wherein the aperture at one end is smaller, the aperture at the other end is larger, and a step surface is generally arranged between the two ends of the different apertures, so that the end with the larger aperture can form an accommodating cavity for accommodating the bearing 521.

In this way, the first intermediate shaft 31 and the second intermediate shaft 32 can be supported by the second housing 6, so that the torque or alternating load borne by the first intermediate shaft 31 and the second intermediate shaft 32 can be transmitted to the second housing 6 to maintain the normal rotation of the eccentric wheel 311 and the second intermediate shaft 32; at the same time, the first intermediate shaft 31 and the second intermediate shaft 32 can also be assisted in positioning and supporting the housing walls of the first housing 5 or other transmission components. The first shell 5 is not needed to share and support the load on the transmission mechanism 3, and the normal drilling, hammering and other operations of the hammering tool can be guaranteed, so that the structural weight of the first shell 5 can be greatly reduced, and the requirements of light weight and miniaturization of the hammering tool are met.

In this embodiment, the peening tool includes a motor having a motor shaft; the output shaft and the motor shaft form an included angle, and the output shaft is used for accommodating the working head; the transmission mechanism is arranged between the motor shaft and the output shaft; the hammering mechanism is used for providing hammering force for the working head; a first housing for housing the hammer mechanism and at least a portion of the output shaft; the second shell is connected with the first shell and used for supporting the transmission mechanism; the third shell is connected with the second shell and used for accommodating at least part of the motor; the transmission mechanism comprises a first intermediate shaft used for driving the hammering mechanism, the first intermediate shaft is provided with a first end close to the motor and a second end far away from the motor, the first end of the first intermediate shaft is fixedly supported on the second shell, and the second end of the first intermediate shaft is arranged to be a cantilever. Through supporting drive mechanism's first intermediate shaft on the less second casing of volume like this, can reduce the structure weight that has the first casing of great volume, when guaranteeing the normal work of hammering instrument, can show the weight that reduces whole instrument to let the realization one-hand that the operator can relax hold or the operation of high machine position.

Example two

The present embodiment provides a hammering tool capable of achieving a light weight for the convenience of operation by an operator. Specifically, the hammering tool in the present embodiment is similar to that in the first embodiment, and thus the description is still continued with reference to fig. 1 to 4 in the foregoing, as shown in fig. 1 to 4, the hammering tool in the present embodiment specifically includes the following components:

a motor 1 having a motor shaft 11;

a transmission mechanism 3 provided between the motor shaft 11 and the output shaft 2;

the hammering mechanism 4 is used for enabling the working head 21 to generate hammering force;

a first housing 5 accommodating at least a part of the output shaft 2;

the transmission mechanism 3 comprises a first intermediate shaft 31 for driving the hammering mechanism 4, the first intermediate shaft 31 is parallel to the motor shaft 11, the first shell 5 and the third shell 7 are made of plastic, and the second shell 6 is made of metal.

Specifically, similar to the hammering tool in the first embodiment, the hammering tool in this embodiment includes a motor 1 for generating rotation to drive the working head 21, the motor 1 has a motor shaft 11, and the motor shaft 11 outputs power to the hammering tool through rotation thereof, so as to rotate the working head 21 in the hammering tool, or generate hammering force for the working head 21 through a hammering mechanism, so as to implement hammering movement. The output shaft 2 is used for accommodating the working head 21 and driving the working head 21 to rotate. The axis of the output shaft 2 and the axis of the motor shaft 11 in the motor 1 are not parallel, but form an included angle with each other, so that the motor 1 is located on one side of the output shaft 2, for example, near the bottom of the hammering tool, at this time, the output shaft 2 and the working head 21 can both be located at the front end of the hammering tool, and the motor 1 is located at the bottom of the rear end of the hammering tool, so that the whole hammering tool is in a vertical structure.

In addition, the hammering tool can also comprise a plurality of shells with different shapes and structures, wherein the hammering tool comprises a first shell 5 for accommodating the output shaft 2; a second housing 6 for supporting the transmission 3, and a third housing 7 for housing at least part of the motor 1. The second housing 6 and the first housing 5 as well as the third housing 7 have connections between them, so that the different housings can be connected to each other to form a complete housing structure.

Wherein, since the first housing 5 can be used to house and protect at least a part of the output shaft 2, it is usually a box-like structure with a hollow cavity, and the output shafts 2 are all disposed inside the hollow cavity of the first housing 5. The second housing 6 serves as a main support member of the transmission mechanism 3, and can bear most of the rotation and alternating load of the transmission mechanism 3, thereby avoiding unstable conditions such as play and the like of the transmission mechanism 3 due to the influence of the load. The third shell 7 can cover the surface of the motor 1 and accommodate at least a part of the motor 1 to protect the motor 1; while the third housing 7 is also used for providing structural accessories such as handles.

In order to connect the output shaft 2 and the motor shaft 11, the hammering tool comprises a transmission mechanism 3, and the transmission mechanism 3 can realize the connection transmission and power output between the output shaft 2 and the motor shaft 11 through transmission structures such as an intermediate shaft and a gear. Wherein, drive mechanism 3 is including being used for driving first jackshaft 31 of hammering mechanism 4, and is parallel between first jackshaft 31 and the motor shaft 11, and first jackshaft 31 and motor shaft 11 all are the contained angle setting with output shaft 2 between promptly.

Since the first intermediate shaft 31 and the motor shaft 11 in the transmission mechanism 3 are parallel and form an included angle with the output shaft 2, the first housing 5 for accommodating at least a part of the output shaft 2 may be generally in an "L" shape or the like to accommodate the output shaft 2 and be connected with the second housing 6 or the like. The second housing 6 may be a plate-like or cover-like structure having a relatively simple shape and a relatively small volume, without forming a relatively complicated structure such as an "L" shape.

Alternatively, the second housing 6 and the first housing 5 may be connected by a connecting member, and the connecting member is connected to the first housing 5 and the second housing 6, respectively, in a direction parallel to the motor shaft 11. Since the second housing 6 may be a plate-like or cover-like structure having a relatively simple structure, the second housing 6 may be connected and fixed to the first housing 5 through the connection member 8 in a direction parallel to the motor shaft 11, i.e., a vertical direction. The connecting member 8 may be a screw or other threaded fastener, and correspondingly, the second housing 6 and the first housing 5 may be provided with a mounting hole corresponding to the screw.

Since the second housing 6 needs to bear high-strength alternating load, the second housing 6 is usually made of metal to ensure good mechanical properties and high strength. The load of the gear mechanism 3 during movement is largely absorbed by the second housing 6, so that the first housing 5 no longer needs to absorb excessive loads and rotational moments. At this time, the main function of the first housing 5 is to form a sealed cavity to protect the moving parts such as the output shaft 2 in the transmission mechanism 3 and to fix and support the transmission mechanism 3. Therefore, the first shell 5 and the third shell 7 can be made of plastics which have certain bearing performance and light weight. Compared with the prior art that the output shaft and the hammering mechanism are protected by using the shell structures such as the reduction box shell and the like which are made of metal and have larger volumes, the first shell 5 made of the light plastic material has the overall volume and the wall thickness which are close to or consistent with each other, but the weight is greatly reduced.

The plastic can be made of two components of nylon and glass fiber, can also be made of two components of nylon and carbon fiber, or is composed of other components. Preferably, the plastic is made by synthesizing two components of nylon and glass fiber, wherein the component of the glass fiber accounts for 45% of the total component, and the component of the nylon accounts for 55% of the total component, so that the strength of the plastic is higher, and the strength requirement of the electric hammer during working is met. Because plastics have advantages such as weight is lighter, chemical stability is good, easy machine-shaping, and under the light weight of self, plastics still can guarantee certain mechanical properties, so can be when guaranteeing that the quality is lighter for realize location and fixed to each drive disk assembly in the first casing 5 and the motor in the third casing 7.

Thus, the transmission mechanism 3 is fixed on the second housing and supported by the second housing 6, when the transmission mechanism 3 drives the working head 21 to drill or hammer, the load applied to the transmission mechanism 3 can be borne and absorbed by the second housing 6, and the first housing 5 only needs to ensure that the transmission mechanism 3 and the output shaft 2 are fixed in position, so that the load is small. Like this because first casing 5 no longer need bear great load, therefore be case shell structure, the great first casing 5 of volume can adopt comparatively light material to make, and only need guarantee the volume account for the load bearing capacity of the less second casing 6 can, can show the weight that reduces whole hammering instrument like this to let the realization that the operator can relax and hold or the operation of high machine position.

In this embodiment, the hammering tool specifically includes the following components: a motor having a motor shaft; the output shaft and the motor shaft form an included angle, and the output shaft is used for accommodating the working head; the transmission mechanism is arranged between the motor shaft and the output shaft; the hammering mechanism is used for enabling the working head to generate hammering force; a first housing accommodating at least a part of the output shaft; the second shell is connected with the first shell and used for supporting the transmission mechanism; the third shell is connected with the second shell and used for accommodating at least part of the motor; drive mechanism is parallel with the motor shaft including the first jackshaft that is used for driving hammering mechanism, first jackshaft, and first casing and third casing are the plastics material, and the second casing is the metal material. Therefore, the load of the transmission mechanism is born by the second shell made of metal, and the first shell does not need to bear larger load, so that the second shell is made of plastic with lighter weight, the normal work of the hammering tool is ensured, meanwhile, the weight of the whole tool can be obviously reduced, and an operator can easily realize the operation of holding by one hand or raising the machine position.

In the description of the present specification, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection. Meanwhile, "connected" may mean either directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hammering tool comprising:

a motor having a motor shaft for outputting power;

characterized in that, hammering instrument still includes:

a first housing for receiving at least part of the hammer mechanism;

the second shell is connected with the first shell through a connecting piece and used for supporting the transmission mechanism, and the second shell is provided with a shaft hole for the motor shaft to pass through; the transmission mechanism comprises a first intermediate shaft for driving the hammering mechanism, the first intermediate shaft is provided with a first end close to the motor and a second end far away from the motor, the first end of the first intermediate shaft is fixedly supported on the second shell, the second end of the first intermediate shaft is arranged to be a free end so that the first intermediate shaft is in a cantilever structure, and the second end protrudes out of the second shell;

the third shell is connected with the second shell and used for accommodating at least part of the motor; the first shell and the third shell are made of plastic materials, and the second shell is made of metal materials.

2. A hammering tool according to claim 1 wherein the angle between the output shaft and the motor shaft is between 80 ° and 100 °.

3. A hammering tool according to claim 1, wherein the second housing is provided with a receiving groove for receiving the first end of the first intermediate shaft.

4. A hammering tool according to claim 3, wherein a ratio of a depth of said receiving groove to a height of said first intermediate shaft is 1/3 or more.

5. A hammering tool according to claim 3 wherein an insert is provided over said first intermediate shaft, said insert being disposed between said first intermediate shaft and said receiving groove.

6. A hammering tool according to claim 5 wherein the insert is of metal.

7. The peening tool of claim 1, wherein the gear train further includes a second intermediate shaft for driving rotation of the output shaft, the second intermediate shaft having a first end proximal to the motor and a second end distal from the motor, the first end of the second intermediate shaft being movably supported on the second housing and the second end of the second intermediate shaft being movably supported on the first housing.

8. A hammering tool according to claim 7 wherein the second housing is provided with a receiving cavity and a connection member is provided between the second intermediate shaft and the receiving cavity.

9. A hammering tool according to claim 8 wherein the attachment is a bearing.

10. A hammering tool according to claim 7 wherein a partition is provided on said first housing, said partition having a through hole formed therein through which said second intermediate shaft passes.

11. A hammering tool as claimed in claim 10, wherein a bearing is provided between said through hole and said second intermediate shaft.

12. The peening tool of claim 7, wherein the first intermediate shaft, the second intermediate shaft, and the motor shaft are coplanar.

13. A hammering tool according to claim 1, wherein the second housing is made of a magnesium alloy material or an aluminum alloy material.

14. A hammering tool comprising:

a motor having a motor shaft;

a transmission mechanism disposed between the motor shaft and the output shaft;

characterized in that the hammering tool further comprises:

a first housing for receiving at least part of the hammer mechanism;

the second shell is connected with the first shell through a connecting piece and is used for supporting the transmission mechanism, and the second shell is provided with a shaft hole for the motor shaft to pass through; the transmission mechanism comprises a first intermediate shaft for driving the hammering mechanism, the first intermediate shaft is parallel to the motor shaft, a first end of the first intermediate shaft is fixedly supported on the second shell, a second end of the first intermediate shaft is arranged to be a free end so that the first intermediate shaft is in a cantilever structure, and the second end protrudes out of the second shell;

the first shell and the third shell are made of plastic materials, and the second shell is made of metal materials;

and the third shell is connected with the second shell and used for accommodating at least part of the motor.

15. The peening tool of claim 14, wherein the coupling is coupled to the first housing and the second housing, respectively, in a direction parallel to the motor shaft.

16. A hammering tool according to claim 15 wherein the attachment means is a screw.