Impact Wrench

Abstract

An impact wrench includes a shell and a handle connected to the shell. The shell includes a main body for accommodating a motor and a raised portion protruding downward from the bottom of the main body, and the handle includes a sleeve portion sleeved on the outer periphery of the main body and a grip portion located below the sleeve portion, wherein the sleeve portion surrounds the outer side of the main body, and the shell can rotate freely relative to the sleeve portion within a small range. The grip portion has a side wall and a hollow cavity formed by the side wall, and the raised portion is located in the hollow cavity. The impact wrench includes an elastic member located between the raised portion and the side wall of the grip portion, wherein one end of the elastic member abuts against the side wall of the grip portion and the other end abuts against the raised portion, so that a vibration reduction system can be arranged in a narrow space. Thereby, the sleeve portion covers a large area of ​​the shell surface, and the impact wrench achieves a vibration reduction effect while ensuring the overall strength.

Description

[Technical Field]

[0001] This invention relates to the field of hand-held tool technology, and in particular to an impact wrench with a vibration damping system. [Background Technology]

[0002] Due to their limited internal space, existing impact wrenches typically lack vibration damping systems, which could compromise overall strength if implemented with conventional systems. Consequently, these wrenches vibrate violently during use due to impacts, severely affecting the communication and structural stability of the battery pack. This can render the wrench unusable, and the problem becomes more pronounced with increasing torque. Furthermore, prolonged use of impact wrenches can lead to user fatigue due to the intense vibrations.

[0003] Therefore, it is indeed necessary to provide an improved impact wrench to overcome the shortcomings of the prior art. [Summary of the Invention]

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide an impact wrench with a vibration damping system, which achieves the vibration damping effect while ensuring the overall strength of the impact wrench.

[0005] The technical solution adopted by the present invention to solve the problem of the prior art is: an impact wrench, including a housing and a handle connected to the housing. The housing includes a main body for accommodating a motor and a protrusion extending downward from the bottom of the main body. The handle includes a sleeve portion sleeved on the outer periphery of the main body and a grip portion located below the sleeve portion. The sleeve portion surrounds the outer side of the main body. The grip portion has a side wall and a hollow cavity formed by the side wall. The protrusion portion is located within the hollow cavity. The impact wrench includes an elastic member located between the protrusion portion and the side wall of the grip portion. One end of the elastic member abuts against the side wall of the grip portion, and the other end abuts against the protrusion portion.

[0006] A further improvement is as follows: the main body includes a middle part located in the middle section and recessed from the outer periphery inward, the sleeve part covers the outer periphery of the middle part, and a gap is formed between the sleeve part and the middle part.

[0007] A further improvement is as follows: the inner diameter of the sleeve portion is not less than the outer diameter of the middle portion of the main body portion, the inner diameter of the sleeve portion is less than the outer diameter of the main body portion at both ends of the middle portion, and the main body portion is provided with protrusions at both ends of the middle portion, the protrusions being used to prevent the sleeve portion from moving axially.

[0008] A further improvement is that the gripping part is provided with a groove that is recessed inward from the side wall and corresponds to the protrusion, and the groove accommodates the elastic element.

[0009] A further improvement is as follows: the handle includes a left housing and a right housing that cooperate with each other. The left housing has a left sleeve portion and a left grip portion located below the left sleeve portion. The right housing has a right sleeve portion and a right grip portion located below the right sleeve portion. The left sleeve portion and the right sleeve portion cooperate to form the sleeve portion, and the left grip portion and the right grip portion cooperate to form the grip portion.

[0010] A further improvement is as follows: the protrusion is provided with a mounting hole formed by a surface recess facing the side wall of the gripping part, the mounting hole is correspondingly provided with the groove of the gripping part, one end of the elastic member is received in the mounting hole and the other end is received in the groove.

[0011] A further improvement is as follows: the mounting hole includes a first mounting hole formed by a recess in the surface facing the side wall of the left grip portion and a second mounting hole formed by a recess in the surface facing the side wall of the right grip portion, wherein the first mounting hole and the second mounting hole are not interconnected.

[0012] A further improvement is as follows: the top of the left sleeve is provided with a left mating part, the top of the right sleeve is provided with a right mating part, the left mating part and the right mating part are provided correspondingly to each other and are connected and mated by fasteners.

[0013] A further improvement is as follows: the bottom of the left sleeve portion and the left grip portion have at least one left mating portion, the bottom of the right sleeve portion and the right grip portion have at least one right mating portion, and at least one left mating portion and at least one right mating portion are correspondingly arranged and connected by fasteners.

[0014] A further improvement is as follows: one of the left mating part and the right mating part has a transverse through hole and the other has a transversely recessed threaded hole. The fastener is a screw, and the fastener passes through the through hole and is fixed to the threaded hole by a threaded connection.

[0015] Compared with the prior art, the present invention has the following advantages: The housing includes a main body for accommodating the motor and a protrusion extending downward from the bottom of the main body. The handle includes a sleeve portion fitted onto the outer periphery of the main body and a grip portion located below the sleeve portion. The sleeve portion surrounds the outer side of the main body, and the housing can rotate freely relative to the sleeve portion within a small range. The grip portion has a hollow cavity formed by side walls, and the protrusion portion is located within the hollow cavity. The impact wrench includes an elastic member located between the protrusion portion and the side wall of the grip portion. One end of the elastic member abuts against the side wall of the grip portion, and the other end abuts against the protrusion portion, thus enabling a vibration damping system to be installed in a confined space. Therefore, the sleeve portion covers the main body portion (i.e., covers a large area of ​​the housing surface), ensuring the overall strength of the impact wrench; and a gap is formed between the sleeve portion and the middle portion, ensuring that the housing can rotate freely relative to the sleeve portion within a small range for cushioning; at the same time, an elastic element is provided between the protrusion and the side wall of the grip portion to form a vibration damping system in a narrow space, thereby reducing the vibration and impact when the impact wrench is working, so as to achieve a vibration damping effect. [Image Description]

[0016] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0017] Figure 1 This is a perspective view of an impact wrench according to a preferred embodiment of the present invention;

[0018] Figure 2 yes Figure 1 An exploded view of the impact wrench shown;

[0019] Figure 3 yes Figure 1 The impact wrench shown is a cross-sectional view along the axial direction.

[0020] Figure 4 yes Figure 1 A radial cross-sectional view of the impact wrench shown;

[0021] Figure 5 yes Figure 1 The diagram shown is a three-dimensional representation of the impact wrench after the right housing has been removed.

[0022] Figure 6 This is a three-dimensional schematic diagram of the impact wrench of the second embodiment of the present invention after the right housing has been removed.

[0023] Meaning of the reference numerals in the diagram:

[0024] 100, Impact wrench; 10, Housing; 11, Main body; 111, Front section; 112, Middle section; 113, Rear section; 12, Protrusion; 121, First mounting hole; 122, Second mounting hole; 20, Handle; 21, Sleeve section; 211, Left sleeve section; 212, Right sleeve section; 22, Grip section; 221, Left grip section; 222, Right grip section; 223, Groove; 23, Receiving section; 231, Receiving cavity; 24, Left mating section; 241, Threaded hole; 25, Right mating section; 251, Through hole; 26, Fastener; 30, Battery pack; 40, Elastic element; 50, Battery pack foot plate; 11', Main body. [Detailed Implementation]

[0025] Please see Figures 1 to 5 As shown, this invention discloses an impact wrench 100, which has a vibration damping system to achieve a vibration reduction effect. The impact wrench 100 includes a housing 10, a handle 20, and a battery pack 30. The housing 10 and the battery pack 30 are respectively connected to the upper and lower ends of the handle 20. The housing 10 is used to house a motor and / or transmission components; that is, the housing 10 can be a housing for a motor, a housing for a gearbox, or a housing used for both a motor and a gearbox. In this embodiment, the housing 10 serves as a housing used for both a motor and a gearbox; the battery pack 30 serves as the power source for the motor within the housing 10.

[0026] Combination Figure 2 and Figure 3 As shown, the housing 10 includes a main body 11 for accommodating a motor and a protrusion 12 extending downward from the bottom of the main body 11, the protrusion 12 being integrally formed on the main body 11. The main body 11 is axially provided with a front section 111, a middle section 112, and a rear section 113, the front section 111 being connected to a working head (not labeled). The middle section 112 is located in the middle of the main body 11 and is recessed inward from the outer periphery of the main body 11, such that the outer diameter of the middle section 112 is smaller than the outer diameters of the front section 111 and the rear section 113.

[0027] Please see Figures 2 to 5As shown, the handle 20 includes a sleeve portion 21 sleeved on the outer periphery of the main body portion 11, a grip portion 22 located below the sleeve portion 21, and a receiving portion 23 located below the grip portion 22. The receiving portion 23 is used to receive the battery pack 30. The sleeve portion 21 covers the outer periphery of the middle portion 112 of the main body portion 11 to axially fix the main body portion 11. Since the sleeve portion 21 surrounds the outer side of the middle portion 112 of the main body portion 11, that is, covers a large area of ​​the surface of the housing 10, the overall strength of the impact wrench 100 is ensured. At the same time, a gap is formed between the sleeve portion 21 and the middle portion 112 and it is not circumferentially fixed, which ensures that when the housing 10 is subjected to vibration and impact, the vibration and impact can be converted into a small range of circumferential rotation relative to the sleeve portion 21 to buffer the vibration and impact.

[0028] The inner diameter of the sleeve portion 21 is not less than the outer diameter of the middle portion 112 of the main body portion 11, and the inner diameter of the sleeve portion 21 is less than the outer diameter of the main body portion 11 at both ends of the middle portion 112. The main body portion 11 is provided with protrusions at both ends of the middle portion 112, which are used to prevent axial movement of the sleeve portion 21. At the same time, the outer diameter of the sleeve portion 21 is not greater than the outer diameter of the front section 111 and the rear section 113 of the main body portion 11 (i.e., the other parts of the main body portion 11 excluding the middle portion 112), thereby ensuring the overall strength of the impact wrench 100 while avoiding increasing the overall size of the impact wrench 100.

[0029] In this embodiment, the handle 20 is composed of a left housing 201 and a right housing 202 that cooperate with each other. The left housing 201 is provided with a left sleeve portion 211 and a left grip portion 221 located below the left sleeve portion 211. The right housing 202 is provided with a right sleeve portion 212 and a right grip portion 222 located below the right sleeve portion 212. The left sleeve portion 211 and the right sleeve portion 212 cooperate to form the sleeve portion 21, and the left grip portion 221 and the right grip portion 222 cooperate to form the grip portion 22.

[0030] The left sleeve portion 211 has a left mating portion 24 at its top, and the right sleeve portion 212 has a right mating portion 25 at its top. The left mating portion 24 and the right mating portion 25 are correspondingly arranged and connected by a fastener 26. One of the left mating portion 24 and the right mating portion 212 has a transversely penetrating through hole 251, and the other has a transversely inwardly recessed threaded hole 241. The fastener 26 is a screw, and the fastener 26 passes through the through hole 251 and is fixed to the threaded hole 241 by a threaded connection. In this embodiment, the left mating portion 24 has a threaded hole 241, and the right mating portion 25 has a through hole 251. The fastener 26 passes through the through hole 251 of the right mating portion 25 and is fixed to the threaded hole 241 of the left sleeve portion 24 by a threaded connection.

[0031] Meanwhile, the bottom of the left sleeve portion 211 and the left grip portion 221 have at least one left mating portion 24, and the bottom of the right sleeve portion 212 and the right grip portion 222 have at least one right mating portion 25. The at least one left mating portion 24 and the at least one right mating portion 25 are correspondingly arranged and connected by fasteners 26. In this embodiment, the bottom of the left sleeve portion 211 and the left grip portion 221 each have a pair of left mating portions 24, and the bottom of the right sleeve portion 212 and the right grip portion 222 each have a pair of right mating portions 25. The left mating portions 24 and the right mating portions 25 cooperate with each other and are threadedly connected and fixed by fasteners 26 to ensure that the left housing 201 and the right housing 202 form an integral housing 20.

[0032] Combination Figure 4 As shown, the grip portion 22 has a sidewall and a hollow cavity 203 formed by the sidewall, and the protrusion 12 of the housing 10 is located within the hollow cavity 203. The impact wrench 100 includes an elastic member 40 located between the protrusion 12 and the sidewall of the grip portion 22. One end of the elastic member 40 abuts against the sidewall of the grip portion 22 and the other end abuts against the protrusion 12, thereby achieving a vibration reduction effect between the housing 10 and the handle 20. The grip portion 22 is provided with a groove 223 that is recessed inward from the sidewall and corresponds to the protrusion 12, and the groove 223 accommodates the elastic member 40.

[0033] In this embodiment, the protrusion 12 has a mounting hole formed by a surface recess facing the sidewall of the grip portion 22. The mounting hole corresponds to the groove 223 of the grip portion 22. One end of the elastic member 40 is received in the mounting hole and the other end is received in the groove 223. The mounting hole includes a first mounting hole 121 formed by a surface recess facing the sidewall of the left grip portion 221 and a second mounting hole 122 formed by a surface recess facing the sidewall of the right grip portion 222. The first mounting hole 121 and the second mounting hole 122 correspond to each other in the lateral direction but do not penetrate each other. The elastic member 40 is a spring or a rubber member and is divided into two pairs. One pair of elastic members 40 is received between the first mounting hole 121 and the groove 223 of the left grip portion 221, while the other pair of elastic members 40 is received between the second mounting hole 122 and the groove 223 of the right grip portion 222. In this way, the impact wrench 100 forms a vibration reduction system in a confined space, thereby further reducing the vibration and impact when the impact wrench 100 is working, so as to achieve the vibration reduction effect.

[0034] The impact wrench 100 also includes a battery pack foot plate 50 for mounting the battery pack 30. The receiving portion 23 of the handle 20 is located below the grip portion 22 and has a receiving cavity 231. The battery pack foot plate 50 is housed within the receiving cavity 231 of the receiving portion 23. The battery pack foot plate 50 is located at the lower end of the handle and is electrically connected to the motor and transmission assembly inside the housing 10 via a wire.

[0035] Please see Figure 6 The diagram shown is a schematic representation of the impact wrench 100 according to the second embodiment of the present invention after removing the right housing 202. The structure of the impact wrench 100 in the second embodiment is largely the same as that in the first embodiment, with the only difference being the housing: in the first embodiment, the main body 11 of the housing 10 is an integral structure, and the protrusion 12 is integrally formed on the lower part of the main body 11; while in the second embodiment, the main body 11' of the housing is assembled from two mating left and right halves of the housing and fixed with screws, and the protrusion 12 is integrally formed on the lower part of one of the left and right halves of the housing. The arrangement of the main body 11' in the second embodiment facilitates the assembly of the motor and transmission components within the housing 10 in existing designs.

[0036] In this invention, the housing 10 includes a main body 11 and a protrusion 12 extending downward from the bottom of the main body 11. The handle 20 includes a sleeve 21 fitted onto the outer periphery of the main body 1 and a gripping portion 22 located below the sleeve 21. The sleeve 21 surrounds the outer side of the main body 11, and a gap is formed between the sleeve 21 and the middle portion 112, and the handle is not circumferentially fixed, so that the housing 10 can rotate circumferentially relative to the sleeve 21 within a small range. The gripping portion 22 has a side wall and a hollow cavity 203 formed by the side wall. The protrusion 12 is located within the hollow cavity 203. The impact wrench 100 includes an elastic member 40 located between the protrusion 12 and the side wall of the gripping portion 22. One end of the elastic member 40 abuts against the side wall of the gripping portion 22, and the other end abuts against the protrusion 12, thus enabling a vibration damping system to be installed in a confined space. Therefore, the sleeve portion 21 covers the main body portion 11 (i.e., covers a large area of ​​the surface of the housing 10), ensuring the overall strength of the impact wrench 100; a gap is formed between the sleeve portion 21 and the middle portion 112 and it is not circumferentially fixed, ensuring that the housing 10 can rotate freely relative to the sleeve portion 21 within a small range when subjected to vibration and impact, thereby buffering the aforementioned vibration and impact. At the same time, an elastic element 40 is provided between the protrusion 12 and the side wall of the grip portion 22 to form a vibration damping system in a confined space, thereby further reducing the vibration and impact when the impact wrench 100 is working, to achieve a vibration damping effect.

[0037] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions to the impact wrench of this invention can be found without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. An impact wrench, comprising a housing and a handle connected to the housing; characterized in that: The shell includes a main body for accommodating the motor and a raised portion protruding downward from the bottom of the main body, the main body includes an intermediate portion located in the middle section and recessed inward from the outer circumference, the handle includes a sleeve portion sleeved on the outer circumference of the main body and a gripping portion located below the sleeve portion, the shell rotates circumferentially relative to the sleeve portion, the sleeve portion surrounds the outer side of the main body, the inner diameter of the sleeve portion is greater than the outer diameter of the intermediate portion, and the inner diameter of the sleeve portion is smaller than the outer diameter of the main body at both ends of the intermediate portion, the sleeve portion covers the outer circumference of the intermediate portion, a gap is formed between the sleeve portion and the intermediate portion and is not circumferentially fixed, the gripping portion has a side wall and a hollow cavity surrounded by the side wall, the raised portion is located in the hollow cavity, and the impact wrench includes an elastic member located between the raised portion and the side wall of the gripping portion, one end of the elastic member abuts against the side wall of the gripping portion and the other end abuts against the raised portion.

2. The impact wrench according to claim 1, characterized in that: The main body is provided with protrusions at both ends of the middle portion, and the protrusions are used to prevent the sleeve portion from axially moving.

3. The impact wrench according to claim 1, characterized in that: The gripping portion is provided with a groove which is recessed inwardly from the side wall and is arranged corresponding to the protruding portion, and the groove accommodates the elastic member.

4. The impact wrench according to claim 3, characterized in that: The handle includes a left shell and a right shell that cooperate with each other. The left shell is provided with a left sleeve portion and a left grip portion located below the left sleeve portion, and the right shell is provided with a right sleeve portion and a right grip portion located below the right sleeve portion. The left sleeve portion and the right sleeve portion cooperate to form the sleeve portion, and the left grip portion and the right grip portion cooperate to form the grip portion.

5. The impact wrench according to claim 4, characterized in that: The protrusion is provided with a mounting hole formed by a surface depression facing the side wall of the gripping portion, the mounting hole is arranged corresponding to the groove of the gripping portion, one end of the elastic member is received in the mounting hole and the other end is received in the groove.

6. The impact wrench according to claim 5, characterized in that: The mounting hole includes a first mounting hole formed by a depression on a surface facing the left gripping portion side wall and a second mounting hole formed by a depression on a surface facing the right gripping portion side wall, and the first mounting hole and the second mounting hole are not interpenetrating with each other.

7. The impact wrench according to claim 4, characterized in that: A left matching portion is provided at the top of the left sleeve portion, and a right matching portion is provided at the top of the right sleeve portion. The left matching portion and the right matching portion are arranged corresponding to each other and are connected and matched by fasteners.

8. The impact wrench according to claim 7, characterized in that: The bottom of the left sleeve portion and the left grip portion have at least one left mating portion, the bottom of the right sleeve portion and the right grip portion have at least one right mating portion, and at least one left mating portion and at least one right mating portion are arranged corresponding to each other and connected and mated by fasteners.

9. The impact wrench according to claim 7 or 8, characterized in that: One of the left matching part and the right matching part has a through hole extending transversely therethrough and the other has a threaded hole recessed transversely inwardly. The fastener is a screw, and the fastener passes through the through hole and is fixed to the threaded hole in a threaded connection manner.

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