High-power long-service-life impact structure and impact wrench applying same

Abstract

The high-power long-service-life impact structure comprises an output shaft capable of rotating around the axis of the output shaft, extending blades arranged in the radial direction of the output shaft are arranged on the output shaft, and at least one impact face is formed on the side wall of each extending blade; when the extending blades rotate upwards, the distance between the hit face and the vertical face penetrating through the axis of the output shaft is reduced in the direction away from the output shaft. The striking block is provided with a striking boss part, the striking boss part is provided with at least one striking surface, the striking surface is attached to the striking surface, and the striking block strikes the striking surface through the striking surface. The anti-impact device has the advantages of being high in anti-impact capacity and long in service life.

Description

Technical Field

[0001] The present application relates to the technical field of electric impact wrenches, and in particular to a high-power and high-life impact structure and an impact wrench using the same. Background Art

[0002] The impact wrench is composed of an electric motor, a planetary gear reducer, a ball screw groove impact mechanism, a forward and reverse power switch, a power connection device and a motor sleeve. Figure 1 The impact wrench shown in the figure includes a rotating striking block and an output shaft, and a pair of striking blades are arranged on the output shaft for the striking block to rotate and strike, and the side walls of the striking blades are two parallel side walls as shown in the figure, so that the impact force will generate a shear stress at the root A of the striking blade. When the power of the impact wrench is too large, the striking of the striking block makes it very easy for the rotating blade to crack from the root, resulting in damage to the output shaft. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a high-power and high-life impact structure, which has the advantages of strong impact resistance and long life.

[0004] In order to achieve the above object, the technical solution of the utility model is as follows:

[0005] A high-power and high-life impact structure comprises an output shaft that can rotate around its own axis, the output shaft (1) is provided with at least one extension blade arranged along the radial direction of the output shaft, and at least one impact surface is formed on the side wall of the extension blade; when the extension blade rotates to face upward, the distance between the impact surface and the vertical surface passing through the axis of the output shaft decreases in the direction away from the output shaft;

[0006] A striking block is provided with a striking boss portion, and the striking boss portion is provided with at least one striking surface, the striking surface is in contact with the struck surface, and the striking block strikes the struck surface through the striking surface.

[0007] To implement the above technical solution, after the striking surface hits the receiving surface, an impact force F perpendicular to the receiving surface will act on the receiving surface. The impact force F can be decomposed into a component force Fx pointing in the direction of the output shaft axis and a component force Fy along the tangent direction of the output shaft, that is, the component force Fx is used to radially compress the extended blades, and the component force Fy is used to pull and compress the extended blades to rotate circumferentially. Under the extrusion action of the component force Fx, the shear resistance of the extended blades can be improved, thereby reducing the occurrence of extended blade breakage caused by the shear stress generated by the component force Fy.

[0008] As a preferred solution of the present application, when the extended blade is rotated to face upward, the inclination angle between the striking surface and the vertical surface is a, and the inclination angle a is between 5° and 30°.

[0009] The above technical solution is implemented to ensure that the impact force can generate enough component force Fy to make the output shaft rotate, and at the same time there can be a certain component force Fx to press the extension blade to prevent the component force Fy from causing the root of the extension blade to break.

[0010] As a preferred solution of the present application, the inclination angle a is 5°.

[0011] The above technical solution is implemented to ensure sufficient component force Fy, that is, the motor output power can be output to the outside at a large extent.

[0012] As a preferred solution of the present application, each of the extended blades includes two striking surfaces that are arranged opposite to each other, and the striking boss portion has two striking surfaces that are arranged opposite to each other.

[0013] By implementing the above technical solution, when the striking block is rotating forward and reverse, different striking surfaces can be used to strike different receiving surfaces, thereby causing the output shaft to rotate forward and reverse; and because of the two oppositely arranged receiving surfaces, the root of the connection between the extended blade and the output shaft is relatively thick, thereby further improving the load-bearing capacity of the connection between the extended blade and the output shaft.

[0014] As a preferred solution of the present application, two extension blades are arranged on the output shaft, and the two extension blades are arranged radially symmetrically along the output shaft.

[0015] By implementing the above technical solution, the frequency at which the output shaft is struck by the striking block is increased, thereby increasing the output force of the output shaft.

[0016] As a preferred solution of the present application, two striking bosses are provided, and the two striking bosses are radially symmetrically arranged along the rotation axis of the output shaft.

[0017] By implementing the above technical solution, the two extended blades are subjected to the impact force F at the same time, and the separation Fx of the two impact forces F act on each other and are simultaneously applied to the output shaft, thereby preventing the output shaft from axially deviating and wearing due to a single separation Fx, thereby ensuring the service life of the output shaft.

[0018] As a preferred solution of the present application, a reinforcement ring is provided on the output shaft, and the reinforcement ring is made integrally with the extension blade.

[0019] By implementing the above technical solution, the reinforcing ring can play a reinforcing role at the connection between the extended blade and the output shaft, thereby ensuring the stability of the connection between the extended blade and the output shaft.

[0020] As a preferred solution of the present application, a ratio K between the width d of the reinforcement ring and the length D of the extended blade is between 0.3-0.6, and a ratio between the thickness h of the reinforcement ring and the thickness H of the extended blade is between 0.35-0.7.

[0021] The above technical solution is implemented to ensure that the root of the extended blade can be reinforced by the reinforcement ring, thereby ensuring the stability of the extended blade; the ratio between the thickness h of the reinforcement ring and the thickness H of the extended blade is between 0.35-0.7, which ensures the reinforcement effect while preventing the reinforcement ring from being too thick, affecting the rotation of the output shaft and the overall production cost.

[0022] As a preferred solution of the present application, an arc-shaped transition surface is provided between the striking surface and the side wall of the output shaft.

[0023] The above technical solution is implemented to prevent stress concentration from causing fracture at the connection between the extended blade and the output shaft.

[0024] The present application also provides an impact wrench, which includes the above-mentioned impact structure, and thus has all the beneficial technical effects of the impact structure, which will not be described in detail herein.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. That is, after the striking surface hits the struck surface, an impact force F perpendicular to the struck surface will act on the struck surface. The impact force F can be decomposed into a component force Fx pointing to the axial direction of the output shaft and a component force Fy along the tangent direction of the output shaft. That is, the component force Fx is used to radially squeeze the extended blades, while the component force Fy is used to pull and press the extended blades to rotate circumferentially. Under the squeezing action of the component force Fx, the shear resistance of the extended blades can be improved, thereby reducing the occurrence of extended blade fractures caused by the shear stress generated by the component force Fy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is the background technology diagram of this application.

[0029] Figure 2 It is a schematic diagram of the overall structure of a high-power and long-life impact structure of the present application.

[0030] Figure 3 It is an exploded diagram of a high-power and long-life impact structure of the present application.

[0031] Figure 4 This is a force analysis diagram of a high-power and long-life impact structure of the present application.

[0032] Figure 5 This is a bottom view of the output shaft in a high-power and long-life impact structure of the present application.

[0033] Figure 6 It is a side view of the output shaft in a high-power and long-life impact structure of the present application.

[0034] Figure numerals: 1, output shaft; 11, extended blade; 111, striking surface; 112, arc-shaped transition surface; 12, reinforcement ring; 2, striking block; 21, striking boss; 22, striking surface; 3, vertical surface. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] The present application embodiment discloses a high-power and long-life impact structure. Figure 1The high-power and high-life impact structure includes an output shaft 1 that can rotate around its own axis. The end of the output shaft 1 is provided with at least one extended blade 11 arranged along the radial direction of the output shaft 1 itself, and the extended blade 11 is made integrally with the output shaft 1. At least one striking surface 111 is formed on the side wall of the extended blade 11; when the extended blade rotates to face upward, the distance between the striking surface 111 and the vertical surface 3 passing through the axis of the output shaft 1 decreases in the direction away from the output shaft 1, that is, the striking surface 111 is inclined toward the axis of the output shaft 1 (inwardly inclined); the striking block 2 is provided with a striking boss portion 21, and at least one striking surface 22 is provided on the side wall of the striking boss portion. When the striking surface 22 is in contact with the striking surface 111, the striking surface 22 is parallel to the striking surface 111. When the striking block 2 rotates around the axis of the output shaft 1, the striking surface 22 strikes the striking surface 111, so that the striking block 2 intermittently strikes the striking surface 111, thereby causing the output shaft 1 to obtain a pulsed rotational force and rotate. Among them, because the distance between the striking surface 111 and the vertical surface 3 passing through the axis of the output shaft 1 decreases in the direction away from the output shaft 1 (inward inclination), that is, after the striking surface 22 hits the striking surface 111, it will act on the striking surface 111 with an impact force F perpendicular to the striking surface 111. The impact force F can be decomposed into a component force Fx pointing in the direction of the axis of the output shaft 1, and a component force Fy along the tangent direction of the output shaft 1, that is, the component force Fx is used to radially squeeze the extended blade 11, and the component force Fy is used to pull and compress the extended blade 11 to rotate circumferentially. Under the squeezing action of the component force Fx, the shear resistance of the extended blade 11 can be improved, thereby reducing the occurrence of the extended blade 11 breakage caused by the shear stress generated by the component force Fy.

[0037] When the extended blade rotates upward, the inclination angle between the impact surface 111 and the vertical surface 3 is a, and the inclination angle a is between 5°-30° to ensure that the impact force can generate enough component force Fy to make the output shaft 1 impact and rotate, and at the same time, a certain component force Fx can press the extended blade 11 to prevent the component force Fy from causing the root of the extended blade 11 to break. The inclination angle a is preferably 5° to ensure sufficient component force Fy.

[0038] Each extension blade 11 includes two oppositely disposed striking surfaces 111, and two striking surfaces 22 are oppositely disposed on the striking boss portion 21. The two striking surfaces 22 are disposed correspondingly to the two striking surfaces 111, so that when the striking block 2 rotates forward and reversely, different striking surfaces 22 can strike different striking surfaces 111, thereby causing the output shaft 1 to output forward and reversely. In addition, because of the two oppositely disposed striking surfaces 111, the root of the connection between the extension blade 11 and the output shaft 1 is relatively thick, thereby further improving the bearing capacity of the connection between the extension blade 11 and the output shaft 1.

[0039] Two extension blades 11 are arranged on the output shaft 1, and the two extension blades 11 are arranged radially symmetrically along the output shaft 1, so that the frequency of the output shaft 1 being struck by the striking block 2 is increased, thereby increasing the output force of the output shaft 1. Two striking bosses 21 are arranged radially symmetrically on the striking platform along the rotation axis of the output shaft 1, so that the two striking platforms can strike the two extension blades 11 at the same time, so that the two extension blades 11 are subjected to the impact force F at the same time, and the separation Fx of the two impact forces F act on the output shaft 1 at the same time, thereby preventing the output shaft 1 from axially deviating and wearing due to the single separation Fx, thereby ensuring the service life of the output shaft 1.

[0040] A reinforcement ring 12 is provided on the output shaft 1. The reinforcement ring 12 is provided between the extension blade 11 and the output shaft 1. The reinforcement ring 12 and the extension blade 11 are made in one piece, so that the reinforcement ring 12 can play a reinforcing role at the connection between the extension blade 11 and the output shaft 1, thereby ensuring the stability of the connection between the extension blade 11 and the output shaft 1. The ratio K between the width d of the reinforcement ring 12 and the length D of the extension blade 11 is between 0.3 and 0.6, thereby ensuring that the root of the extension blade 11 can be reinforced by the reinforcement ring 12, thereby ensuring the stability of the extension blade 11. The ratio between the thickness h of the reinforcement ring 12 and the thickness H of the extension blade 11 can ensure the reinforcement effect while preventing the reinforcement ring 12 from being too thick, affecting the rotation of the output shaft 1 and the overall production cost. In order to further prevent stress concentration from causing the connection between the extension blade 11 and the output shaft 1 to break, an arc-shaped transition surface 112 is provided between the impact surface 111 and the side wall of the output shaft 1.

[0041] The implementation principle of a high-power and high-life impact structure in the embodiment of the present application is as follows: after the striking surface 22 hits the struck surface 111, an impact force F perpendicular to the struck surface 111 will be applied to the struck surface 111. The impact force F can be decomposed into a component force Fx pointing to the axial direction of the output shaft 1, and a component force Fy along the tangent direction of the output shaft 1, that is, the component force Fx is used to radially squeeze the extension blade 11, and the component force Fy is used to pull and press the extension blade 11 to rotate circumferentially, and under the squeezing action of the component force Fx, the shear resistance of the extension blade 11 can be improved, thereby reducing the occurrence of the extension blade 11 fracture caused by the shear stress generated by the component force Fy. The two extension blades 11 are subjected to the impact force F at the same time, and the separation Fx of the two impact forces F act on the output shaft 1 at the same time, thereby preventing the output shaft 1 from axially deviating and wearing due to the single separation Fx, thereby ensuring the service life of the output shaft 1.

[0042] The embodiment of the present application also provides an impact wrench, which includes the above-mentioned impact structure and thus has all the beneficial technical effects of the impact structure, which will not be described in detail herein.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-power and long-life impact structure, characterized in that: The invention comprises an output shaft (1) which can rotate around its own axis, wherein the output shaft (1) is provided with at least one extension blade (11) which is arranged radially along the output shaft (1), and at least one striking surface (111) is formed on the side wall of the extension blade (11); when the extension blade (11) rotates to face upward, the distance between the striking surface (111) and a vertical surface (3) passing through the axis of the output shaft (1) decreases in a direction away from the output shaft (1); A striking block (2), wherein a striking boss portion (21) is provided on the striking block (2), and at least one striking surface (22) is provided on the striking boss portion (21), wherein the striking surface (22) is in contact with a struck surface (111), and the striking block (2) strikes the struck surface (111) via the striking surface (22).

2. A high-power and long-life impact structure according to claim 1, characterized in that: When the extended blade (11) rotates to face upward, the inclination angle between the striking surface (111) and the vertical surface (3) is a, and the inclination angle a is between 5° and 30°.

3. A high-power and long-life impact structure according to claim 2, characterized in that: The inclination angle a is 5°.

4. A high-power and long-life impact structure according to claim 1, characterized in that: Each of the extending blades (11) comprises two striking surfaces (111) arranged opposite to each other, and the striking boss portion (21) has two striking surfaces (22) arranged opposite to each other.

5. The high-power and long-life impact structure according to claim 1, characterized in that: The output shaft (1) is provided with two extension blades (11), and the two extension blades (11) are symmetrically arranged along the radial direction of the output shaft (1).

6. A high-power and long-life impact structure according to claim 1, characterized in that: Two striking boss portions (21) are provided, and the two striking boss portions (21) are radially symmetrically arranged along the rotation axis of the output shaft (1).

7. A high-power and long-life impact structure according to claim 1, characterized in that: The output shaft (1) is provided with a reinforcement ring (12), and the reinforcement ring (12) and the extension blade (11) are made in one piece.

8. A high-power and long-life impact structure according to claim 7, characterized in that: The ratio K between the width d of the reinforcement ring (12) and the length D of the extension blade (11) is between 0.3 and 0.6, and the ratio between the thickness h of the reinforcement ring (12) and the thickness H of the extension blade (11) is between 0.1 and 0.

2.

9. The high-power and long-life impact structure according to claim 1, characterized in that: An arc-shaped transition surface (112) is provided between the striking surface (111) and the side wall of the output shaft (1). 10 . An impact wrench comprising the impact structure according to claim 1 .

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