Air wrench striking assembly

Abstract

The utility model provides an air wrench striking assembly which solves the problem that the service life of a spring is affected by an existing air wrench. The pneumatic wrench comprises a shell and an input shaft arranged in the shell, a striking assembly comprises a wheel carrier arranged in the shell, an output shaft is arranged at the front end of the wheel carrier, the rear end of the wheel carrier is connected with the input shaft through a planetary mechanism, a striking sleeve and a spring are sleeved on the output shaft, and a striking block is arranged on the front end face of the striking sleeve. A linkage block matched with the striking block is formed on the outer wall of the output shaft, an annular groove is formed in the rear end face of the striking sleeve, an annular sliding groove is coaxially formed in the bottom wall of the annular groove, and the axial section of the annular sliding groove is in a circular arc shape. A circle of ball matched with the annular sliding groove is arranged in the annular sliding groove, an annular piece coaxial with the annular sliding groove is arranged in the annular groove, the front end of the spring extends into the annular groove and abuts against the rear side face of the annular piece, and the two sides of the ball are pressed on the inner wall of the annular sliding groove and the front side face of the annular piece respectively. The air wrench striking assembly can prolong the service life of the spring.

Description

Technical Field

[0001] The utility model belongs to the field of power tools and relates to an air wrench, in particular to an air wrench striking component. Background Art

[0002] An air wrench, also known as a pneumatic wrench or an air-powered wrench, is a tool that uses compressed air as a power source. It uses a continuous power source to accelerate the rotation of an object with a certain mass, and then instantly hits the output shaft, thereby obtaining a relatively large torque output.

[0003] Existing air wrenches, such as an air wrench and a striking unit thereof disclosed in the China Patent Library (application number: 201620776184.5), include a wheel frame connected to a torque multiplier, a coupling sleeve is sleeved on the wheel frame, a coupling shaft for outputting torque coaxial with the coupling sleeve is provided outside the coupling sleeve, the coupling sleeve and the coupling shaft are respectively provided with matching striking structures, and a lifting mechanism is provided on the wheel frame, the lifting mechanism includes a reset spring located between the wheel frame and the coupling sleeve, a curved groove provided on the wheel frame close to the coupling shaft, and an adjusting steel ball located in the curved groove for promoting the movement of the coupling sleeve.

[0004] In the above-mentioned air wrench, the spring acts directly on the coupling sleeve. Since the coupling sleeve rotates with the wheel frame during actual use, the spring is subjected to a large rotational torque, which aggravates the wear and aging of the spring and affects the service life of the spring. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes an air wrench striking component which can prolong the service life of the spring.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an air wrench striking assembly, the air wrench includes a shell and an input shaft horizontally arranged in the shell, the striking assembly includes a wheel frame arranged in the shell, the front end of the wheel frame is an output shaft coaxial with the input shaft, the rear end of the wheel frame is connected to the input shaft through a planetary mechanism, a striking sleeve and a spring are sleeved on the output shaft, at least two striking blocks are arranged circumferentially on the front end surface of the striking sleeve, a linkage block is formed on the outer wall of the output shaft, the striking blocks and the linkage blocks are the same in number and the two are alternately distributed along the circumference of the output shaft; the spring makes the front end surface of the striking sleeve have a pressing force on the linkage block The trend on the block, a curved groove is formed between the striking sleeve and the output shaft, and a steel ball is arranged in the curved groove, which can enable the striking sleeve to overcome the elastic force of the spring and move backward. The characteristic is that an annular groove is opened on the rear end surface of the striking sleeve, and the annular groove and the striking sleeve are coaxially arranged; an upper annular groove is coaxially opened on the bottom wall of the annular groove, and the axial cross-section of the annular groove is arc-shaped; a circle of balls matching the annular groove is arranged in the annular groove, and an annular sheet coaxial with it is arranged in the annular groove, the front end of the spring extends into the annular groove and presses on the rear side surface of the annular sheet, and the two sides of the ball are respectively pressed on the inner wall of the annular groove and the front side surface of the annular sheet.

[0007] The front end of the spring is in indirect contact with the striking sleeve by means of an annular groove, a ball and an annular sheet, so as to convert the rotational force of the striking sleeve into the axial compression force of the spring, thereby effectively reducing the rotational torque exerted on the spring when the striking sleeve rotates, delaying the wear and aging of the spring, and thus greatly enhancing the service life of the spring.

[0008] In the above-mentioned air wrench striking assembly, the rear end of the wheel frame is rotatably arranged in the housing through the first bearing, a cavity is formed in the rear end of the wheel frame, a gear ring is fixed in the housing, the front end of the input shaft extends into the cavity, and the planetary mechanism includes three gears arranged in the cavity, the three gears are evenly distributed along the circumference of the input shaft, each gear is rotatably arranged on the wheel frame through a pin shaft, and the pin shaft axis and the input shaft axis are arranged parallel; a clearance opening is provided on the side wall of the cavity for one side of the gear to extend out and mesh with the gear ring, the number of the clearance openings and the gears are the same and the positions correspond one to one, a tooth portion is formed at the front end of the input shaft, and each gear meshes with the tooth portion. The above-mentioned design has the advantages of simple structure and stable operation.

[0009] In the above-mentioned air wrench striking assembly, a convex tube is formed on the rear end surface of the wheel frame, the convex tube is sleeved on the input shaft, and the inner hole of the convex tube is connected to the above-mentioned cavity; the first bearing is in the convex tube, and the inner ring and outer ring of the first bearing are respectively fixed to the input shaft and the convex tube.

[0010] In the above-mentioned air wrench striking assembly, the above-mentioned gear ring is integrally formed on the inner wall of the shell.

[0011] The wheel carrier is directly arranged on the input shaft through the first bearing, and the gear ring is integrally formed on the inner wall of the housing, so as to effectively omit the connecting transition piece, realize a simple structure and facilitate assembly.

[0012] In the above-mentioned air wrench striking assembly, an annular step matching the spring is formed on the outer wall of the rear end of the wheel frame, and the rear end of the spring extends into the annular step and presses on the bottom surface of the annular step to enable the spring to stably perform telescopic movement.

[0013] Compared with the prior art, the air wrench striking assembly has the following advantages:

[0014] 1. The front end of the spring is in indirect contact with the striking sleeve by means of an annular groove, a ball and an annular piece, so as to convert the rotational force of the striking sleeve into the axial compression force of the spring, thereby effectively reducing the rotational torque exerted on the spring when the striking sleeve rotates, delaying the wear and aging of the spring, and thus greatly enhancing the service life of the spring.

[0015] 2. The wheel carrier is directly arranged on the input shaft through the first bearing, and the gear ring is integrally formed on the inner wall of the housing, so as to effectively omit the connecting transition piece, realize a simple structure and facilitate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of a gas wrench.

[0017] Figure 2 It is a cross-sectional schematic diagram of a gas wrench.

[0018] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0019] Figure 4 It is a schematic diagram of the connection between the striking sleeve and the wheel frame.

[0020] Figure 5 It is a connection diagram of the striking sleeve and the steel ball.

[0021] In the figure, 1, housing; 1a, ring gear; 2, input shaft; 3, wheel frame; 3a, output shaft; 3b, linkage block; 3c, annular step; 3d, convex pipe; 4, striking sleeve; 4a, striking block; 4b, annular groove; 4c, annular slide groove; 5, spring; 6, curved groove; 7, steel ball; 8, round ball; 9, annular sheet; 10, first bearing; 11, gear; 12, pin shaft. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figure 1 and Figure 2 As shown, the air wrench includes a housing 1 and an input shaft 2 horizontally disposed in the housing 1. In an actual product, the axis of the input shaft 2 extends forward and backward, and the input shaft 2 is rotatably disposed in the housing 1 through a second bearing.

[0024] The air wrench striking assembly includes a wheel frame 3 arranged in a housing 1, and the wheel frame 3 is coaxially arranged with an input shaft 2. The front end of the wheel frame 3 is an output shaft 3a coaxial with the input shaft 2, and the front end of the output shaft 3a extends out of the housing 1. The rear end of the wheel frame 3 is connected to the input shaft 2 through a planetary mechanism, so that the input shaft 2 drives the wheel frame 3 to rotate.

[0025] like Figure 2 , Figure 4 and Figure 5 As shown, the output shaft 3a is sleeved with a striking sleeve 4 and a spring 5, wherein at least two striking blocks 4a are circumferentially arranged on the front end surface of the striking sleeve 4, and a linkage block 3b is formed on the outer wall of the output shaft 3a. The striking blocks 4a and the linkage blocks 3b are the same in number and are alternately distributed along the circumference of the output shaft 3a, and the linkage blocks 3b and the striking blocks 4a cooperate to form a circumferential fit between the output shaft 3a and the striking sleeve 4, so that the output shaft 3a can stably drive the striking sleeve 4 to rotate; the spring 5 makes the front end surface of the striking sleeve 4 have a tendency to press against the linkage block 3b, and a curved groove 6 is formed between the striking sleeve 4 and the output shaft 3a, and a steel ball 7 is arranged in the curved groove 6 to enable the striking sleeve 4 to overcome the elastic force of the spring 5 and move backward.

[0026] In this embodiment,

[0027] The structure of the curved groove 6 is existing. For details, please refer to a pneumatic wrench and its striking unit disclosed in the Chinese Patent Library (application number: 201620776184.5), which will not be elaborated here.

[0028] like Figure 2 and Figure 3 As shown, the spring 5 is installed as follows: an annular groove 4b is provided on the rear end surface of the striking sleeve 4, and the annular groove 4b and the striking sleeve 4 are coaxially arranged. An upper annular groove 4c is coaxially provided on the bottom wall of the annular groove 4b, and the axial cross section of the annular groove 4c is in the shape of an arc. A circle of balls 8 matching the annular groove 4c is provided in the annular groove 4c, and an annular sheet 9 coaxial therewith is provided in the annular groove 4b, and at this time, the annular sheet 9 is sleeved on the output shaft 3a. The front end of the spring 5 extends into the annular groove 4b and presses against the rear side of the annular sheet 9, and the two sides of the ball 8 press against the inner wall of the annular groove 4c and the front side of the annular sheet 9 respectively.

[0029] The front end of the spring 5 is in indirect contact with the striking sleeve 4 by means of the annular groove 4c, the ball 8 and the annular sheet 9, so as to convert the rotational force of the striking sleeve 4 into the axial compression force of the spring 5, thereby effectively reducing the rotational torque exerted on the spring 5 when the striking sleeve 4 rotates, delaying the wear and aging speed of the spring 5, and thus greatly enhancing the service life of the spring 5.

[0030] Further explanation, an annular step 3c matching the spring 5 is formed on the outer wall of the rear end of the wheel frame 3, and the annular step 3c is coaxially arranged with the wheel frame 3. The rear end of the spring 5 extends into the annular step 3c and presses on the bottom surface of the annular step 3c, so that the spring 5 can stably perform telescopic movement.

[0031] like Figure 2 and Figure 4 As shown, the planetary structure is as follows: the rear end of the wheel carrier 3 is rotatably arranged in the housing 1 through the first bearing 10, a cavity is formed in the rear end of the wheel carrier 3, a gear ring 1a is fixed in the housing 1, and the front end of the input shaft 2 extends into the cavity. The planetary mechanism includes three gears 11 arranged in the cavity, and the three gears 11 are evenly distributed along the circumference of the input shaft 2. Each gear 11 is rotatably arranged on the wheel carrier 3 through a pin 12, and the axis of the pin 12 is arranged parallel to the axis of the input shaft 2; a clearance opening is provided on the side wall of the cavity for one side of the gear 11 to extend and mesh with the gear ring 1a, and the number of the clearance openings and the gears 11 are the same and the positions correspond one to one, and a tooth portion is formed at the front end of the input shaft 2, and each gear 11 meshes with the tooth portion. The above design has the advantages of simple structure and stable operation.

[0032] in,

[0033] The connection structure among the gear 11, the pin 12 and the wheel frame 3 is already known and will not be described in detail here.

[0034] The first bearing 10 is installed as follows: a convex tube 3d is integrally formed on the rear end surface of the wheel frame 3, the convex tube 3d is sleeved on the input shaft 2, and the inner hole of the convex tube 3d is connected to the above-mentioned cavity; the first bearing 10 is in the convex tube 3d, the type of the first bearing 10 is a ball bearing, and the inner ring and outer ring of the first bearing 10 are respectively fixed to the input shaft 2 and the convex tube 3d. Preferably, the inner ring and outer ring of the first bearing 10 are respectively fixed to the input shaft 2 and the convex tube 3d by interference fit.

[0035] The gear ring 1 a is integrally formed on the inner wall of the housing 1 .

[0036] The wheel carrier 3 is directly arranged on the input shaft 2 through the first bearing 10, and the ring gear 1a is integrally formed on the inner wall of the housing 1, so as to effectively omit the connecting transition piece, realize a simple structure and facilitate assembly.

[0037] In actual products, the number of the striking block 4a and the number of the linkage block 3b are both 2 to facilitate processing and design.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An air wrench striking assembly, the air wrench comprising a housing (1) and an input shaft (2) horizontally arranged in the housing (1), the striking assembly comprising a wheel frame (3) arranged in the housing (1), the front end of the wheel frame (3) being an output shaft (3a) coaxial with the input shaft (2), the rear end of the wheel frame (3) being connected to the input shaft (2) via a planetary mechanism, a striking sleeve (4) and a spring (5) being sleeved on the output shaft (3a), at least two striking blocks (4a) being circumferentially arranged on the front end surface of the striking sleeve (4), a linkage block (3b) being formed on the outer wall of the output shaft (3a), the striking blocks (4a) and the linkage blocks (3b) being the same in number and being alternately distributed along the circumference of the output shaft (3a); the spring (5) causing the front end surface of the striking sleeve (4) to have a tendency to press against the linkage block (3b), a curved groove (6) being formed between the striking sleeve (4) and the output shaft (3a), a steel ball (7) being arranged in the curved groove (6) to enable the striking sleeve (4) to move backwards against the elastic force of the spring (5), the characteristic being that: An annular groove (4b) is provided on the rear end surface of the striking sleeve (4), and the annular groove (4b) and the striking sleeve (4) are coaxially arranged; an upper annular groove (4c) is coaxially provided on the bottom wall of the annular groove (4b), and the axial cross-section of the annular groove (4c) is in the shape of an arc; a circle of balls (8) matching the annular groove (4c) is provided in the annular groove (4c), and an annular sheet (9) coaxial therewith is provided in the annular groove (4b); the front end of the spring (5) extends into the annular groove (4b) and presses against the rear side surface of the annular sheet (9), and the two sides of the ball (8) are respectively pressed against the inner wall of the annular groove (4c) and the front side surface of the annular sheet (9).

2. The air wrench striking assembly according to claim 1, characterized in that: The rear end of the wheel carrier (3) is rotatably arranged in the housing (1) via a first bearing (10), a cavity is formed in the rear end of the wheel carrier (3), a gear ring (1a) is fixedly arranged in the housing (1), the front end of the input shaft (2) extends into the cavity, and the planetary mechanism comprises three gears (11) arranged in the cavity, the three gears (11) are evenly distributed along the circumference of the input shaft (2), each gear (11) is rotatably arranged on the wheel carrier (3) via a pin shaft (12), and the axis of the pin shaft (12) is arranged parallel to the axis of the input shaft (2); a clearance opening is provided on the side wall of the cavity for one side of the gear (11) to extend out and mesh with the gear ring (1a), the number of the clearance openings and the gears (11) are the same and the positions correspond one to one, a tooth portion is formed at the front end of the input shaft (2), and each gear (11) meshes with the tooth portion.

3. The air wrench striking assembly according to claim 2, characterized in that: A convex tube (3d) is formed on the rear end surface of the wheel frame (3), the convex tube (3d) is sleeved on the input shaft (2), and the inner hole of the convex tube (3d) is connected to the above-mentioned cavity; the first bearing (10) is located in the convex tube (3d), and the inner ring and outer ring of the first bearing (10) are respectively fixedly connected to the input shaft (2) and the convex tube (3d).

4. The air wrench striking assembly according to claim 2 or 3, characterized in that: The gear ring (1a) is integrally formed on the inner wall of the outer shell (1).

5. The air wrench striking assembly according to claim 1, characterized in that: An annular step (3c) matching the spring (5) is also formed on the outer wall of the rear end of the wheel frame (3), and the rear end of the spring (5) extends into the annular step (3c) and presses on the bottom surface of the annular step (3c).

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