Impact tool

Abstract

The utility model relates to an impact tool, which comprises a motor, a driving shaft and a driving shaft, the rear bearing is connected to the rear part of the driving shaft in a sleeving manner; the motor shell is cylindrical so as to accommodate the motor, a bearing chamber is formed in one side of the bottom wall of the motor shell, the bearing chamber accommodates the rear bearing, and a first connecting structure is arranged on the other side of the bottom wall; the handle shell is provided with a holding part and a second connecting structure; the first connecting structure is connected with the second connecting structure through the damping part, and the damping part is clamped by the first connecting structure and the second connecting structure. According to the impact tool, on one hand, the thickness of the motor shell at the bearing chamber can be increased through the arrangement of the first connecting structure, on the other hand, when the impact tool works, the shock absorption piece can reduce the vibration sense transmitted by the first connecting structure to the second connecting structure in the radial direction of the motor, and damage of vibration to the motor shell is reduced; the structural strength of the motor shell at the bearing chamber is improved, and the motor is effectively supported.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an impact tool. Background Art

[0002] Impact tools include impact wrenches, impact screwdrivers, etc., which are widely used in various fields of industrial manufacturing. Impact tools have high power and generate large vibrations when in use.

[0003] For impact tools with handles located behind the motor, the vibrations generated can cause the bearing chamber on the housing that supports the motor bearings to deform or even be damaged, causing it to fail, making it impossible to effectively support the motor. Utility Model Content

[0004] Based on the above-mentioned defects in the prior art, the purpose of the present utility model is to provide an impact tool, in which a shock-absorbing mechanism is arranged between the motor housing and the handle housing, so that the bearing chamber inside the motor housing and the first connecting structure for shock absorption are distributed on the inner and outer sides of the housing, which can not only increase the thickness of the motor housing at the bearing chamber to a certain extent, but also directly absorb vibrations, thereby improving the structural strength of the motor housing at the bearing chamber and ensuring that the motor is effectively supported.

[0005] To this end, the present invention provides the following technical solutions.

[0006] The utility model provides an impact tool, which includes:

[0007] a motor including a drive shaft;

[0008] a rear bearing sleeved on the rear portion of the drive shaft;

[0009] a motor housing, the motor housing being cylindrical and accommodating the motor, a bearing chamber being formed on one side of a bottom wall of the motor housing, the bearing chamber accommodating the rear bearing, and a first connecting structure being provided on the other side of the bottom wall;

[0010] a handle housing, which is provided with a grip portion and a second connecting structure;

[0011] Shock-absorbing member, the first connecting structure is connected to the second connecting structure through the shock-absorbing member, and the shock-absorbing member is clamped.

[0012] Optionally, the impact tool also includes a fastener, the first connecting structure is provided with a first mounting hole, and the second connecting structure is provided with a second mounting hole; the fastener cooperates with the first mounting hole and the second mounting hole to connect the first connecting structure with the second connecting structure; the axis of the fastener is perpendicular to the axis of the motor.

[0013] Optionally, the shock-absorbing member is sleeved on the outer periphery of the fastener and the two are interference fit.

[0014] Optionally, the second connecting structure includes a column portion and an annular extension portion, the second mounting hole is provided on the column portion, the annular extension portion is provided around the column portion and an annular groove is formed therebetween, and the shock absorber includes a first annular portion and a connecting portion sequentially connected in a radial direction of the motor;

[0015] The first annular portion is clamped in the annular groove to reduce axial vibration of the handle housing; the outer end face of the first annular portion abuts against the bottom wall of the annular groove along the radial direction of the motor, and the connecting portion abuts against the end of the column portion along the radial direction of the motor to reduce radial vibration of the handle housing.

[0016] Optionally, the inner wall of the first annular portion is provided with a first concave-convex surface, and the first concave-convex surface abuts against the outer wall of the cylindrical portion in the axial direction of the motor.

[0017] Optionally, the first concave-convex surface is a sawtooth structure.

[0018] Optionally, the shock absorber includes a connecting portion and a second annular portion sequentially connected in the radial direction of the motor, and the first connecting structure is provided with a groove;

[0019] The second annular portion is clamped in the groove to reduce axial vibration of the handle housing; the outer end face of the second annular portion abuts against the bottom wall of the groove along the radial direction of the motor, and the connecting portion abuts against the outer end face of the shock absorber along the radial direction of the motor to reduce radial vibration of the handle housing.

[0020] Optionally, the outer wall of the second annular portion is provided with a second concave-convex surface, and the second concave-convex surface abuts against the groove wall of the groove in the axial direction of the motor.

[0021] Optionally, the second concave-convex surface is a sawtooth structure.

[0022] Optionally, the handle housing includes a first housing and a second housing, and the first housing and the second housing are respectively provided with a second connecting structure;

[0023] The second connection structure of the first housing, a shock absorbing member, the first connection structure, another shock absorbing member and the second connection structure of the second housing are sequentially distributed along the radial direction of the motor and are locked by the fastener.

[0024] The utility model has the following technical effects:

[0025] The utility model provides an impact tool, wherein a bearing chamber is arranged on the inner wall of a motor housing, a first connecting structure is arranged on the outer wall of the motor housing opposite to the bearing chamber, and a shock-absorbing component is arranged between the first connecting structure and the second connecting structure of the handle housing to form a shock-absorbing mechanism. On the one hand, the arrangement of the first connecting structure can increase the thickness of the motor housing at the bearing chamber to a certain extent. On the other hand, when the impact tool is operating, the shock-absorbing component can reduce the vibration transmitted from the first connecting structure to the second connecting structure along the radial direction of the motor, reduce the damage of the vibration to the motor housing, improve the structural strength of the motor housing at the bearing chamber, and ensure that the motor is effectively supported. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural cross-sectional view of the impact tool of the present utility model;

[0027] Figure 2 This is a partial structural sectional view of the impact tool of the present utility model;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is an exploded view of the local structure of the impact tool of the present utility model;

[0030] Figure 5 This is a schematic diagram of the three-dimensional structure of the second shell of the present invention;

[0031] Figure 6 It is a schematic diagram of the three-dimensional structure of the shock-absorbing component of the present utility model.

[0032] Description of Reference Numerals

[0033] 100. Impact tools;

[0034] 1. Motor; 11. Drive shaft;

[0035] 2. Rear bearing;

[0036] 3. Motor housing; 31. First connecting structure; 311. First mounting hole; 312. Groove;

[0037] 4. Handle housing; 41. Grip portion; 42. Second connecting structure; 421. Second mounting hole; 422. Column portion; 423. Annular extension portion; 424. Annular groove; 43. First housing; 44. Second housing;

[0038] 5. Shock absorber; 51. First annular portion; 511. First concave-convex surface; 52. Connecting portion; 53. Second annular portion; 531. Second concave-convex surface;

[0039] 6. Fasteners;

[0040] 7. Impact component. DETAILED DESCRIPTION

[0041] To make the technical solutions and beneficial effects of the present invention more clearly understood, the following describes the present invention in detail by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0042] In the description of the present invention, unless otherwise expressly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of simplifying the description of the present invention, and do not indicate that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation to the present invention.

[0043] In this utility model, the terms "first" and "second" are used solely for descriptive clarity and should not be construed as indicating the relative importance of the features indicated or the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, and "several" means at least one, unless expressly specified otherwise.

[0044] In this utility model, unless otherwise expressly defined, the terms "install," "connect," "connect," "fix," "dispose," etc. should be understood broadly. For example, "connection" can mean fixed connection, detachable connection, or integral molding; it can be mechanical or electrical; it can be direct connection or indirect connection through an intermediary; it can also refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0045] In the present invention, unless otherwise clearly defined, when a first feature is “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact via an intermediate medium. Moreover, when a first feature is “on,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0046] The “front”, “back”, “left”, “right”, “up” and “down” mentioned in this utility model are all Figure 1 and Figure 4 The markings in the table shall prevail.

[0047] The following is based on Figures 1 to 6 The impact tool of the present invention is described in detail.

[0048] In this embodiment, if Figures 1 to 4 As shown, the impact tool 100 includes a motor 1, a rear bearing 2, a motor housing 3, a handle housing 4, a shock absorber 5, and an impact assembly 7. The motor 1 is located in the motor housing 3 and includes a drive shaft 11. The motor 1 outputs a rotational driving force to the impact assembly 7 via the drive shaft 11. The rear bearing 2 is sleeved on the rear portion of the drive shaft 11 with an interference fit, and the rear bearing 2 is used to support the rear portion of the drive shaft 11. The motor housing 3 is cylindrical and is used to accommodate the motor 1. A bearing chamber is formed on the inner side of the bottom wall of the motor housing 3, and the bearing chamber is used to accommodate the rear bearing 2. A first connecting structure 31 is provided on the outer side of the bottom wall of the motor housing 3. The handle housing 4 is provided with a grip portion 41 and a second connecting structure 42. The grip portion 41 is used for the operator to hold the impact tool 100. The first connecting structure 31 , the shock absorbing member 5 and the second connecting structure 42 are sequentially distributed along the radial direction of the motor 1 . The first connecting structure 31 is connected to the second connecting structure 42 and clamps the shock absorbing member 5 in the radial direction of the motor 1 . The shock absorbing member 5 is used to radially absorb vibration of the handle housing 4 .

[0049] By adopting the above technical solution, the bearing chamber and the first connecting structure 31 are arranged on the inner and outer sides of the rear side of the motor housing 3, and a shock-absorbing member 5 is arranged between the first connecting structure 31 and the second connecting structure 42. In this way, during the operation of the impact tool 100, the vibration generated by the impact assembly 7 is transmitted backward to the motor 1, the rear bearing 2, and the first connecting structure 31 of the motor housing 3 in sequence, and the vibration is then transmitted to the handle housing 4 through the connection between the first connecting structure 31 and the second connecting structure 42. The setting of the first connecting structure 31 can increase the thickness of the motor housing 3 at the bearing chamber to a certain extent. In addition, when the impact tool is operating, the shock-absorbing member 5 can reduce the vibration transmitted from the first connecting structure 31 to the second connecting structure 42 along the radial direction of the motor, reduce the damage of the vibration to the motor housing 3, improve the structural strength of the motor housing 3 at the bearing chamber, and ensure that the motor is effectively supported.

[0050] In one embodiment, if Figures 2 to 5 As shown, the impact tool 100 further includes a fastener 6 (e.g., a bolt). The first connecting structure 31 is provided with a first mounting hole 311, and the second connecting structure 42 is provided with a second mounting hole 421. The axes of the first mounting hole 311 and the second mounting hole 421 coincide with each other and are perpendicular to the axis of the motor 1. The fastener 6 cooperates with the first mounting hole 311 and the second mounting hole 421 to connect the first connecting structure 31 and the second connecting structure 42. The axis of the fastener 6 is perpendicular to the axis of the motor 1. Of course, the connection method between the first connecting structure 31 and the second connecting structure 42 is not limited to fastener connection, and can also be a buckle connection, for example.

[0051] Further, if Figure 3 As shown, the shock absorber 5 is sleeved on the outer periphery of the fastener 6 and the two are interference fit. In this way, the shock absorber 5 can also weaken the axial vibration and radial vibration generated by the fastener 6 to reduce the vibration transmitted from the fastener 6 to the second connecting structure 42.

[0052] In one embodiment, if Figure 1 and Figure 4 As shown, the axis of the motor 1 extends in the front-to-back direction, and the axes of the first mounting hole 311 , the second mounting hole 421 , and the fastener 6 all extend in the left-to-right direction.

[0053] In one embodiment, if Figure 3 and Figure 5 As shown, the second connecting structure 42 includes a columnar portion 422 and an annular extension portion 423, the second mounting hole 421 is provided on the columnar portion 422, the annular extension portion 423 is arranged around the columnar portion 422 and an annular groove 424 is formed therebetween, and the shock absorber 5 includes a first annular portion 51 and a connecting portion 52 which are sequentially connected in the radial direction of the motor 1.

[0054] The first annular portion 51 is clamped in the annular groove 424. When the vibration of the first connecting structure 31 is transmitted to the column portion 422 through the fastener 6, the column portion 422 vibrates and squeezes against the first annular portion 51. The first annular portion 51 is deformed by the squeezing, thereby absorbing the vibration force transmitted from the column portion 422 to the annular extension portion 423 along the axial direction of the motor 1, thereby being able to reduce the axial vibration of the handle housing 4.

[0055] The outer end face of the first annular portion 51 abuts against the bottom wall of the annular groove 424 along the radial direction of the motor 1, and the connecting portion 52 abuts against the end of the column portion 422 along the radial direction of the motor 1. When the first connecting structure 31 vibrates along the radial direction of the motor 1, the first connecting structure 31 squeezes the shock-absorbing component 5 along the radial direction of the motor 1, the first annular portion 51 squeezes the bottom wall of the annular groove 424 along the radial direction of the motor 1, and the connecting portion 52 squeezes the end of the column portion 422 along the radial direction of the motor 1. The shock-absorbing component 5 is deformed by the squeezing to absorb the vibration force transmitted by the first connecting structure 31 toward the second connecting structure 42 along the radial direction of the motor 1, thereby being able to radially reduce the vibration of the handle shell 4.

[0056] Further, if Figure 3 and Figure 6 As shown, the inner wall of the first annular portion 51 is provided with a first concave-convex surface 511. The first concave-convex surface 511 abuts against the outer wall of the cylindrical portion 422 in the axial direction of the motor 1. Thus, when the cylindrical portion 422 presses the first concave-convex surface 511 in the axial direction of the motor 1, the concave-convex surface structure can increase the deformation amplitude of the first annular portion 51, thereby improving the axial vibration reduction effect. Preferably, the first concave-convex surface 511 has a serrated structure.

[0057] In one embodiment, if Figure 3 and Figure 6 As shown, the shock absorber 5 further includes a second annular portion 53 . The first annular portion 51 , the connecting portion 52 and the second annular portion 53 are sequentially connected in the radial direction of the motor 1 . The first connecting structure 31 is provided with a groove 312 .

[0058] like Figure 3 and Figure 4 As shown, the second annular portion 53 is clamped in the groove 312. When the first connecting structure 31 vibrates along the axial direction of the motor 1, the groove side wall of the groove 312 squeezes the second annular portion 53 along the axial direction of the motor 1. The second annular portion 53 is deformed by the squeezing, thereby absorbing the vibration force transmitted by the first connecting structure 31 along the axial direction of the motor 1, and thus can reduce the axial vibration of the handle shell 4.

[0059] like Figure 3 and Figure 4As shown, the outer end face of the second annular portion 53 abuts against the bottom wall of the groove 312 along the radial direction of the motor 1, and the connecting portion 52 abuts against the outer end face of the shock absorber 5 along the radial direction of the motor 1. When the first connecting structure 31 vibrates along the radial direction of the motor 1, the bottom wall of the groove 312 squeezes the second annular portion 53 along the radial direction of the motor 1, and the outer end face of the shock absorber 5 squeezes the connecting portion 52 along the radial direction of the motor 1. Both the connecting portion 52 and the second annular portion 53 are squeezed and deformed, thereby absorbing the vibration force transmitted by the first connecting structure 31 toward the second connecting structure 42 along the radial direction of the motor 1, thereby being able to radially reduce vibration of the handle shell 4.

[0060] Further, if Figure 3 and Figure 6 As shown, the outer wall of the second annular portion 53 is provided with a second concave-convex surface 531. The second concave-convex surface 531 abuts against the wall of the groove 312 in the axial direction of the motor 1. Thus, when the first connecting structure 31 vibrates axially in the motor 1, the wall of the groove 312 presses the second concave-convex surface 531 in the axial direction of the motor 1. The concave-convex surface structure can increase the deformation amplitude of the second annular portion 53, thereby improving the axial vibration reduction effect. Preferably, the second concave-convex surface 531 has a serrated structure.

[0061] In one embodiment, if Figures 2 to 4 As shown, the handle housing 4 includes a first housing 43 and a second housing 44. Each of the first and second housings 43 and 44 is provided with a second connecting structure 42. The second connecting structure 42 of the first housing 43, a shock absorber 5, the first connecting structure 31, another shock absorber 5, and the second connecting structure 42 of the second housing 44 are sequentially arranged along the radial direction of the motor 1 and secured by fasteners 6. In this embodiment, the handle housing 4 is configured as a split structure for ease of assembly. Furthermore, the second connecting structure 42 is provided on both the first and second housings 43 and 44. One shock absorber 5 is provided at the junction of the first housing 43 and the first connecting structure 31, and another shock absorber 5 is provided at the junction of the second housing 44 and the first connecting structure 31, enhancing the vibration reduction effect. The two shock absorbers 5 are symmetrically arranged about the axis of the motor 1. The first connecting structure 31 is also symmetrical about the axis of the motor 1 and includes two grooves 312 for engaging the second annular portions 53 of the two shock absorbers 5.

[0062] Further, if Figure 4 As shown, the number of fasteners 6 is three, the number of first connecting structures 31 is three, the number of second connecting structures 42 on the first shell 43 is three, and a shock absorber 5 is configured at each of the three connections between the first shell 43 and the motor shell 3. The number of second connecting structures 42 on the second shell 44 is three, and a shock absorber 5 is configured at each of the three connections between the second shell 44 and the motor shell 3.

[0063] Further, if Figure 2 As shown, the second mounting hole 421 provided in one of the second connecting structures 42 in the first shell 43 and the second shell 44 is a through hole, serving as an insertion port for the fastener 6, and the second mounting hole 421 provided in the other second connecting structure 42 is a blind hole to improve the aesthetics.

[0064] It should be understood that the radial and axial directions in “radial shock absorption” and “axial shock absorption” in this article are both based on the motor 1 as a reference, that is, radial shock absorption means weakening the vibration generated by the impact tool 100 in the radial direction of the motor 1, and axial shock absorption means weakening the vibration generated by the impact tool 100 in the axial direction of the motor 1.

[0065] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the claims. Various modifications and variations may be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form additional embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of the present invention and do not limit the scope of protection of the present utility model patent.

Claims

1. An impact tool, characterized in that: The impact tool (100) comprises: A motor (1) comprising a drive shaft (11); a rear bearing (2) sleeved on the rear portion of the drive shaft (11); A motor housing (3), the motor housing (3) being cylindrical and accommodating the motor (1), a bearing chamber being formed on one side of a bottom wall of the motor housing (3), the bearing chamber accommodating the rear bearing (2), and a first connecting structure (31) being provided on the other side of the bottom wall; A handle housing (4) provided with a gripping portion (41) and a second connecting structure (42); A shock absorbing member (5), wherein the first connecting structure (31) is connected to the second connecting structure (42) via the shock absorbing member (5) and clamps the shock absorbing member (5).

2. The impact tool according to claim 1, wherein The impact tool (100) further includes a fastener (6); the first connecting structure (31) is provided with a first mounting hole (311); the second connecting structure (42) is provided with a second mounting hole (421); the fastener (6) cooperates with the first mounting hole (311) and the second mounting hole (421) to connect the first connecting structure (31) and the second connecting structure (42); the axis of the fastener (6) is perpendicular to the axis of the motor (1).

3. The impact tool according to claim 2, wherein: The shock absorbing member (5) is sleeved on the outer periphery of the fastening member (6) and the two are interference fit.

4. The impact tool according to claim 2, wherein: The second connection structure (42) includes a column portion (422) and an annular extension portion (423); the second mounting hole (421) is provided on the column portion (422); the annular extension portion (423) is provided around the column portion (422) and an annular groove (424) is formed therebetween; the shock absorber (5) includes a first annular portion (51) and a connecting portion (52) sequentially connected in the radial direction of the motor (1); The first annular portion (51) is clamped in the annular groove (424) to reduce axial vibration of the handle housing (4); the outer end surface of the first annular portion (51) abuts against the bottom wall of the annular groove (424) along the radial direction of the motor (1), and the connecting portion (52) abuts against the end of the column portion (422) along the radial direction of the motor (1) to reduce radial vibration of the handle housing (4).

5. The impact tool according to claim 4, wherein The inner wall of the first annular portion (51) is provided with a first concave-convex surface (511), and the first concave-convex surface (511) abuts against the outer wall of the columnar portion (422) in the axial direction of the motor (1).

6. The impact tool according to claim 5, wherein: The first concave-convex surface (511) is a sawtooth structure.

7. The impact tool according to any one of claims 2 to 6, characterized in that The shock-absorbing member (5) comprises a connecting portion (52) and a second annular portion (53) sequentially connected in the radial direction of the motor (1); the first connecting structure (31) is provided with a groove (312); The second annular portion (53) is clamped in the groove (312) to reduce axial vibration of the handle housing (4); the outer end surface of the second annular portion (53) abuts against the bottom wall of the groove (312) along the radial direction of the motor (1), and the connecting portion (52) abuts against the outer end surface of the shock absorbing member (5) along the radial direction of the motor (1) to reduce radial vibration of the handle housing (4).

8. The impact tool according to claim 7, wherein The outer wall of the second annular portion (53) is provided with a second concave-convex surface (531), and the second concave-convex surface (531) abuts against the groove wall of the groove (312) in the axial direction of the motor (1).

9. The impact tool according to claim 8, wherein The second concave-convex surface (531) is a sawtooth structure.

10. The impact tool according to claim 7, wherein The handle housing (4) comprises a first housing (43) and a second housing (44), wherein the first housing (43) and the second housing (44) are respectively provided with a second connecting structure (42); The second connection structure (42) of the first housing (43), a shock absorbing member (5), the first connection structure (31), another shock absorbing member (5) and the second connection structure (42) of the second housing (44) are sequentially distributed along the radial direction of the motor (1) and are locked by the fastener (6).

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