Power tool hammering set

Abstract

The utility model relates to a power tool hammering set which is characterized in that a rotating seat is connected and driven by a rotating mechanism to rotate around an axial direction, the rotating seat comprises a plurality of side walls which are distributed around the axial direction at intervals, and a guide groove is defined between any two adjacent side walls; the output shaft piece is arranged on the rotating seat in a relatively rotating manner and comprises a shaft part, a plurality of strike bearing blocks which are convexly arranged on the shaft part at intervals in the circumferential direction, and an annular concave part which is axially opened towards the rotating seat; the pushing part is arranged on the inner side of the rotating seat; the pushing piece is sleeved on the output shaft piece in a synchronous rotation manner and comprises a pushed part facing the pushing part; the hammering piece can be sleeved on the output shaft piece in a relatively rotating manner, the hammering piece comprises a body and a plurality of striking blocks which are radially arranged on the body in a protruding manner, and each striking block can be accommodated in one guide groove in an axial sliding manner; the elastic piece is located between the rotating base and the output shaft piece, and one end of the elastic piece is contained in the annular concave part and elastically abuts against the output shaft piece towards the side away from the rotating base.

Description

Technical Field

[0001] This utility model relates to power tools, and in particular to a power tool hammering assembly. Background Technology

[0002] General power tools, such as pneumatic or electric impact tools, use a pneumatic or electric motor to drive a hammer assembly to rotate, which generates intermittent impact force to provide better rotation effect.

[0003] The main components of the existing hammering assembly include the hammering chamber, hammering block, and output shaft. However, the mechanism for generating intermittent impacts in the existing hammering assembly is relatively complex in terms of manufacturing, assembly, and replacement. In addition, the conventional hammering mechanism has a long configuration, which makes it easy for the operator to generate a large torque when holding it, which is laborious and has poor operational stability. There are shortcomings that urgently need to be improved.

[0004] Therefore, it is necessary to provide a novel and progressive power tool hammer assembly to solve the above-mentioned problems. Summary of the Invention

[0005] The main purpose of this utility model is to provide a power tool hammer assembly with a shorter overall length, which facilitates labor-saving operation.

[0006] To achieve the above objectives, this utility model provides a power tool hammer assembly, comprising: a rotating base, an output shaft, a pushing part, a pushing member, a hammering member, and an elastic member. The rotating seat is connected to a rotating mechanism and rotates about an axis. The rotating seat includes a plurality of sidewalls spaced apart around the axis, and a guide groove is defined between any two adjacent sidewalls. The output shaft is rotatably disposed on the rotating seat and includes a shaft portion, a plurality of impact blocks protruding from the shaft portion at circumferential intervals, and an annular recess opening axially toward the rotating seat. The pushing portion is disposed on an inner side of the rotating seat. The pushing member is rotatably sleeved on the output shaft and includes a pushed portion facing the pushing portion. The hammer is rotatably sleeved on the output shaft and includes a body and a plurality of impact blocks protruding radially from the body. Each impact block is axially slidably accommodated in a guide groove. The elastic member is located between the rotating seat and the output shaft, and one end of the elastic member is accommodated in the annular recess and springs against the output shaft toward a side away from the rotating seat. When the rotating seat rotates, it causes the pushing part to rotate around the axial direction. The pushing part intermittently pushes against the pushed part along the axial direction. The pushing member causes the hammer to move intermittently along the axial direction, so that the plurality of striking blocks partially protrude from the guide grooves and intermittently interfere with and strike the plurality of striking blocks in one rotation direction of the rotating seat.

[0007] As a preferred embodiment of the above technical solution, preferably, each of the impact blocks has two outwardly convex impact surfaces on its two opposite sides, and each of the striking blocks has two straight-extending striking surfaces on its two opposite sides, and each striking block can strike one of the impact surfaces in the rotation direction.

[0008] As a preferred embodiment of the above technical solution, preferably, the contact area between each striking surface and one of the sidewalls is no greater than 2 / 3 of the area of ​​the striking surface.

[0009] As a preferred embodiment of the above technical solution, the side of the pusher facing the pushing part further includes a second concave surface, and one end of the pushed part is provided with two oblique guide surfaces located on opposite sides of the second concave surface.

[0010] As a preferred embodiment of the above technical solution, the pushing part includes a kit disposed on the output shaft, and the pushing part further includes a sleeve portion axially protruding from the pushed part, the sleeve portion at least partially radially overlapping the kit.

[0011] As a preferred embodiment of the above technical solution, preferably, the sleeve portion has a recessed groove on the side facing the kit, and one end of the kit can be accommodated in the groove.

[0012] As a preferred embodiment of the above technical solution, the outer peripheral surface of the kit includes a first concave arc surface, and the pushing part further includes a roller that can move along the first concave arc surface about the axial direction. In a radial view transverse to the axial direction, the roller does not protrude from one end of the kit.

[0013] As a preferred embodiment of the above technical solution, the rotating seat further includes a bottom wall, the plurality of side walls extending parallel to the axial direction and protruding from the bottom wall, the bottom wall having an arc groove extending around the axial direction and accommodating at least a portion of the pushing portion, the arc of the arc groove being no greater than π.

[0014] As a preferred embodiment of the above technical solution, the pushing part includes a roller, and the axial depth of the arc groove is not greater than 1.2 times the diameter of the roller.

[0015] As a preferred embodiment of the above technical solution, preferably, each of the impact blocks has two outwardly convex impact surfaces on opposite sides, and each of the striking blocks has two straight-extending striking surfaces on opposite sides, and each striking block can strike one of the impact surfaces in the rotation direction; the contact area between each striking surface and a sidewall is not greater than 2 / 3 of the area of ​​the striking surface; the sleeve portion has a recessed groove on the side facing the kit, and one end of the kit can be accommodated in the groove; the kit includes a first end and a second end located on opposite sides of the first concave surface, the first end can be accommodated in the groove, and the second end can be embedded in the rotating seat; the first end... The radial dimension of the pusher is smaller than the radial dimension of the second end; the pusher extends from the sleeve in a pointed shape toward the pusher; the side of the pusher facing the pusher also includes a second concave surface, and the roller can move along the second concave surface about the axial direction; one end of the pusher is provided with two oblique guide surfaces located on opposite sides of the second concave surface; the rotating seat also includes a bottom wall, the plurality of side walls extending parallel to the axial direction and protruding from the bottom wall, the bottom wall is recessed with an arc groove extending about the axial direction and accommodating at least part of the pusher, the arc of the arc groove is not greater than π; and the axial depth of the arc groove is not greater than 1.2 times the diameter of the roller. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0018] Figure 2 This is an exploded view of a preferred embodiment of the present invention.

[0019] Figure 3 This is an exploded view from another perspective of a preferred embodiment of the present invention.

[0020] Figure 4 This is a top view of a rotating base according to a preferred embodiment of the present invention.

[0021] Figures 5 to 6 This is a schematic cross-sectional view of the operation of a preferred embodiment of the present invention.

[0022] Figure 7 This is a top view of a preferred embodiment of the present invention.

[0023] Wherein, 1: power tool hammer assembly; 10: rotating seat; 11: side wall; 12: guide groove; 13: bottom wall; 131: arc groove; 132: abutment wall; 20: output shaft; 21: shaft part; 22: impact block; 221: impact surface; 23: annular recess; 30: pushing part; 31: kit; 311: first arc concave surface; 312: first end; 313: second end; 32: roller; 40: pusher; 41: pushed part; 411: inclined guide surface; 42: sleeve part; 421: receiving groove; 43: second arc concave surface; 50: hammering part; 51: body; 52: impact block; 521: impact surface; 53: inner flange; 60: elastic element; A: axial direction; D: axial depth. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please refer to Figures 1 to 7 This shows a preferred embodiment of the present invention. The power tool hammer assembly 1 of the present invention includes a rotating seat 10, an output shaft 20, a pushing part 30, a pushing part 40, a hammering part 50, and an elastic part 60.

[0026] The rotating seat 10 is driven by a rotating mechanism to rotate about an axis A. The rotating seat 10 includes a plurality of sidewalls 11 spaced apart about the axis A, and a guide groove 12 is defined between any two adjacent sidewalls 11. The output shaft 20 is rotatably disposed on the rotating seat 10 and includes a shaft portion 21, a plurality of circumferentially spaced bearing blocks 22 protruding from the shaft portion 21, and an annular recess 23 opening axially toward the rotating seat 10. The pushing portion 30 is disposed on an inner side of the rotating seat 10. The pusher 40 rotates synchronously. The output shaft 20 is fitted with a push-receiving portion 41 facing the push-abutment portion 30; the hammer 50 is rotatably fitted onto the output shaft 20, and the hammer 50 includes a body 51 and a plurality of radially protruding striking blocks 52 on the body 51, each striking block 52 being axially slidably accommodated in a guide groove 12; the elastic member 60 is located between the rotating seat 10 and the output shaft 20, one end of the elastic member 60 being accommodated in the annular recess 23 and springing against the output shaft 20 toward the side away from the rotating seat 10. When the rotating seat 10 rotates, causing the push-abutment portion 30 to rotate around the axial direction A, the push-abutment portion 30 intermittently pushes against the push-receiving portion 41 along the axial direction A, such as... Figure 6As shown, the pusher 40 drives the hammer 50 to move intermittently along the axial direction A, causing the plurality of striking blocks 52 to partially protrude from the guide grooves 12 and intermittently interfere with and strike the plurality of impact blocks 22 in a rotational direction of the rotating seat 10. The power tool hammer assembly 1 can be used with pneumatic or electric tools. The power tool hammer assembly 1 has a simple structure, is easy to process and assemble, and has a compact configuration that allows for a shorter overall length, facilitating labor-saving operation.

[0027] In this embodiment, the other end of the elastic member 60 abuts against an inner flange 53 of the hammer member 50 and is located between an inner circumferential surface of the hammer member 50 and an outer circumferential surface of the output shaft member 20, which is easy to assemble and has good operational stability.

[0028] The pushing part 30 includes a kit 31 disposed on the output shaft 20. The pushing member 40 further includes a sleeve part 42 protruding axially from the pushed part 41. The sleeve part 42 at least partially overlaps radially with the kit 31, which is beneficial for miniaturization. Preferably, the side of the sleeve part 42 facing the kit 31 is recessed with a receiving groove 421, and one end of the kit 31 can be received in the receiving groove 421, which provides good stability and smooth operation. The outer peripheral surface of the kit 31 includes a first arcuate concave surface 311. The pushing part 30 further includes a roller 32 that can move along the first arcuate concave surface 311 around the axial direction A. In a radial view transverse to the axial direction A, the roller 32 does not protrude from one end of the kit 31, which can guide the movement of the roller 32 and prevent the roller 32 from disengaging during hammering and resetting. In this embodiment, the kit 31 includes a first end 312 and a second end 313 located on opposite sides of the first concave surface 311. The first end 312 can be accommodated in the receiving groove 421, and the second end 313 can be embedded in the rotating seat 10. The radial dimension of the first end 312 is smaller than the radial dimension of the second end 313, which facilitates assembly. The second end 313 has good support strength and can withstand the impact force when the hammer 50 is axially reset.

[0029] Specifically, the pusher 40, facing the abutment 30, further includes a second concave surface 43. The roller 32 can move along the second concave surface 43 about the axial direction A. The roller 32 can be clamped between the first concave surface 311, the second concave surface 43, and the rotating seat 10. Figure 5 As shown, the guiding effect is good and it helps to rotate smoothly. The push-receiving part 41 extends from the sleeve part 42 in a pointed shape toward the push-abutting part 30; one end of the push-receiving part 41 is provided with two oblique guide surfaces 411 located on opposite sides of the second arc concave surface 43, which reduces the contact area between the roller 32 and the push-receiving part 41, and the rotation is smooth and without jamming.

[0030] Reference Figure 4The rotating base 10 further includes a bottom wall 13, and a plurality of side walls 11 extend parallel to the axial direction A and protrude from the bottom wall 13. The bottom wall 13 has a recessed arc groove 131 extending around the axial direction A and accommodating at least a portion of the abutment portion 30. The arc curvature of the arc groove 131 is not greater than π. The roller 32 can move in the arc groove 131 and selectively abut against one of the two abutment walls 132 located on opposite sides of the arc groove 131, thereby allowing the output shaft 20 to rotate in both directions. Preferably, the axial depth D of the arc groove 131 is not greater than 1.2 times the diameter of the roller 32, which can effectively limit the roller 32 and avoid increasing the axial length of the power tool hammer assembly 1, thus facilitating miniaturization.

[0031] Reference Figure 7 Each impact block 22 has two outwardly convex impact surfaces 221 on its two opposite sides, and each impact block 52 has two straight impact surfaces 521 on its two opposite sides. Each impact block 52 can strike one of the impact surfaces 221 in the rotational direction. The non-complete contact provides better contact stability and better force transmission. Preferably, the contact area between each impact surface 521 and the sidewall 11 is no more than 2 / 3 of the area of ​​the impact surface 521, reducing contact friction and allowing each impact block 52 to move smoothly along the axial direction A in the guide groove 12.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power tool hammering set, characterized in that include: A rotating seat, connected to and driven by a rotating mechanism to rotate about an axis, includes a plurality of sidewalls spaced apart about the axis, and a guide groove is defined between any two adjacent sidewalls. An output shaft component is rotatably disposed on the rotating seat, including a shaft portion, a plurality of impact blocks protruding from the shaft portion at circumferential intervals, and an annular recess opening axially toward the rotating seat; A pushing part is provided on one inner side of the rotating seat; A pusher, which is synchronously rotated and sleeved on the output shaft, includes a push-receiving part facing the pusher; A hammer-shaped component, rotatably fitted onto the output shaft, includes a main body and a plurality of radially protruding striking blocks on the main body, each striking block being axially slidably accommodated in a guide groove; and An elastic element is located between the rotating seat and the output shaft. One end of the elastic element is accommodated in the annular recess and springs against the output shaft on the side away from the rotating seat. When the rotating seat rotates, it causes the pushing part to rotate around the axial direction. The pushing part intermittently pushes against the pushed part along the axial direction. The pushing member causes the hammer to move intermittently along the axial direction, so that the plurality of striking blocks partially protrude from the guide grooves and intermittently interfere with and strike the plurality of striking blocks in one rotation direction of the rotating seat.

2. The power tool hammering set of claim 1, wherein, Each of the impact blocks has two impact surfaces extending outward in an arc on its two opposite sides, and each of the striking blocks has two straight striking surfaces extending on its two opposite sides. Each striking block can strike one of the impact surfaces in the rotation direction.

3. The power tool hammering set of claim 2, wherein, The contact area between each striking surface and a sidewall is no more than 2 / 3 of the area of ​​the striking surface.

4. The power tool hammering set of claim 1, wherein, The pusher has a second concave surface on the side facing the pushing part, and one end of the pushed part is provided with two oblique guide surfaces on opposite sides of the second concave surface.

5. The power tool hammering set of claim 1, wherein, The pushing part includes a kit disposed on the output shaft, and the pushing part further includes a sleeve portion axially protruding from the pushed part, the sleeve portion at least partially radially overlapping the kit.

6. The power tool hammering set of claim 5, wherein, The socket has a recessed groove on the side facing the kit, and one end of the kit can be accommodated in the groove.

7. The power tool hammering set of claim 5, wherein, The outer peripheral surface of the kit includes a first concave arc surface, and the pushing part further includes a roller that can move along the first concave arc surface about the axial direction. In a radial view transverse to the axial direction, the roller does not protrude from one end of the kit.

8. The power tool hammering set according to any one of claims 1 to 6, characterized in that The rotating seat further includes a bottom wall, and a plurality of side walls extend parallel to the axial direction and protrude from the bottom wall. The bottom wall is recessed with an arc groove that extends around the axial direction and accommodates at least a portion of the pushing portion. The arc of the arc groove is not greater than π.

9. The power tool hammering set of claim 8, wherein, The pushing part includes a roller, and the axial depth of the arc groove is not greater than 1.2 times the diameter of the roller.

10. The power tool hammering set of claim 7, wherein, Each of the impact blocks has two outwardly convex impact surfaces on opposite sides, and each of the striking blocks has two straight striking surfaces on opposite sides. Each striking block can strike one of the impact surfaces in the rotational direction. The contact area between each striking surface and a sidewall is not greater than 2 / 3 of the area of ​​the striking surface. The sleeve portion has a recessed groove on the side facing the assembly, and one end of the assembly can be accommodated in the groove. The assembly includes a first end and a second end located on opposite sides of the first concave surface. The first end can be accommodated in the groove, and the second end can be embedded in the rotating seat. The radial dimension of the first end is less than... The second end has a radial dimension; the pushed portion extends from the sleeve portion in a pointed shape toward the pushing portion; the side of the pusher facing the pushing portion further includes a second arcuate concave surface, and the roller can move along the second arcuate concave surface about the axial direction; one end of the pushed portion is provided with two oblique guide surfaces located on opposite sides of the second arcuate concave surface; the rotating seat further includes a bottom wall, the plurality of side walls extending parallel to the axial direction and protruding from the bottom wall, the bottom wall is recessed with an arcuate groove extending about the axial direction and accommodating at least a portion of the pushing portion, the arcuate groove having an extension arc not greater than π; and the arcuate groove having an axial depth not greater than 1.2 times the diameter of the roller.

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