Gear positioning tool

Abstract

The utility model discloses a gear positioning tool which comprises a bearing piece and a press-fit piece and further comprises a limiting assembly used for conducting circumferential limiting on a gear, the limiting assembly comprises a positioning block and an elastic limiting piece, the positioning block is arranged on the side, facing the press-fit piece, of the bearing piece in a protruding mode, and the elastic limiting piece is arranged on the side, facing the press-fit piece, of the bearing piece. A groove is formed in one axial side of the gear, the positioning block is matched with the groove so that the positioning block can be inserted into the groove, and the elastic limiting piece abuts against the inner wall of the groove and elastically stretches out and draws back in the circumferential direction of the gear hobbing. The limiting assembly is arranged to limit the gear in the circumferential direction, the gear is prevented from rotating in the machining process, meanwhile, the elastic limiting piece is arranged to enable the positioning block to be attached to the gear more tightly, the limiting effect of the limiting assembly on the gear is better, the gear is firmly fixed and cannot move, and the machining precision is improved. Therefore, the accuracy of the machining position is ensured, and the gear is prevented from becoming a waste part due to the deviation of the machining position.

Description

Technical Field

[0001] The utility model relates to the technical field of gear processing, in particular to a gear positioning tool. Background Art

[0002] Gear transmission is a common transmission method in people's lives and is widely used. Some gears are used in particularly harsh conditions and are required to operate under continuous impact, vibration and overload conditions, and the service life is required to be more than 15 years. This puts higher requirements on the reliability of the gears, and therefore also puts higher requirements on the grinding of the gears. Among them, gear hobbing is a process of processing gears based on the principle of the development method. Using a hob to process a pair of wheels is equivalent to a pair of staggered spiral wheels meshing. When hobbing the gears, the gears need to be firmly fixed, otherwise once the gears move, even if it is only a very small movement, the processed teeth will deviate from the standard parts. After the gear processing deviates, it cannot mesh with other gears during use, that is, the gear becomes a scrap part. Existing positioning tooling usually only focuses on the axial fixation and radial fixation of the gears to be processed. The gears may rotate during the processing, which may cause deviations in the gear processing. Utility Model Content

[0003] In view of the deficiencies of the above-mentioned prior art, the technical problem to be solved by the utility model is: to provide a gear positioning tool, which not only fixes the gear to be processed axially and radially, but also fixes the gear circumferentially to prevent the gear from rotating during the processing, so that the processing position is always accurate, and avoids the gear becoming scrap due to processing position deviation.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a gear positioning tool for positioning the gear to be processed during gear rolling, including a supporting member on which the gear is mounted and a pressing member capable of pressing the gear onto the supporting member, and also including a limiting component arranged on the supporting member for circumferentially limiting the gear to avoid rotation of the gear, the limiting component including a positioning block and an elastic limiting member arranged in the positioning block, the positioning block is convexly arranged on the supporting member on one side facing the pressing member, the axial side of the gear has a groove, the positioning block matches the groove so as to be able to be inserted therein, the elastic limiting member abuts against the inner wall of the groove and elastically expands and contracts along the circumference of the gear rolling.

[0005] Furthermore, the gear has an axially opened through hole in the middle, the supporting member includes a base and a core shaft arranged on the base, the outer diameter of the core shaft matches the inner diameter of the through hole so that it can be passed through it, and the pressing member has a clamping hole matching the core shaft on one side facing the supporting member.

[0006] Furthermore, the base is provided with a positioning pin along its own axial direction on one side facing the pressing part, one end of the positioning pin away from the pressing part is buried in the base, and the other end extends out of the base, and the positioning block is provided with a socket matching the positioning pin so that the end of the positioning pin extending out of the base can be inserted therein.

[0007] Furthermore, the elastic limiting member is arranged at one end of the positioning block away from the positioning pin, and includes a stop block and an elastic member. A mounting hole is opened on one circumferential side wall of the positioning block, and the elastic member is arranged in the mounting hole along the length direction of the mounting hole. The stop block is connected to one end of the elastic member away from the bottom wall of the mounting hole, and one end of the stop block away from the elastic member extends out of the mounting hole so as to be able to abut against the inner wall of the groove.

[0008] Furthermore, the elastic member is a coil spring.

[0009] Furthermore, there are a plurality of positioning blocks, and the plurality of positioning blocks are spaced apart and distributed in a circle with the center of the core shaft as the center.

[0010] Furthermore, the core shaft has an embedded section, a penetration section and an insertion section, the embedded section is embedded in the base, the penetration section is arranged on a side of the embedded section close to the pressing part and protrudes from the base to a side close to the pressing part, the insertion section is arranged at an end of the penetration section away from the embedded section and the outer diameter of the insertion section matches the inner diameter of the clamping hole.

[0011] Furthermore, the base is provided with a through hole for the embedded section to be embedded therein, the through hole passes through the base axially, a first protrusion is provided between the embedded section and the penetration section, the outer diameter of the first protrusion is larger than the inner diameter of the through hole, one end of the embedded section away from the first protrusion extends outward from the base, and a section of the embedded section extending out of the base is threaded with a fixing nut.

[0012] Furthermore, the pressing part has a connecting portion connected to an external power device and a pressing portion for pressing the rolling gear, the pressing portion is arranged at one end of the connecting portion close to the supporting member, and the outer diameter of the pressing portion is larger than the outer diameter of the connecting portion.

[0013] Furthermore, the base includes a middle section, a placement seat and a mounting seat. The placement seat is arranged at one end of the middle section close to the pressing piece to support the gear, and the outer diameter of the placement seat is larger than the outer diameter of the middle section. The mounting seat is arranged at one end of the middle section away from the pressing piece to fix the base on the processing platform, and the outer diameter of the mounting seat is larger than the outer diameter of the middle section.

[0014] The gear positioning tool of the present invention has at least the following beneficial effects: a limit assembly is provided to limit the gear circumferentially to prevent the gear from rotating during processing, and an elastic limit piece is provided to make the positioning block and the gear fit more closely, so that the limit assembly has a better limiting effect on the gear; at the same time, the supporting piece and the pressing piece are used to limit the gear in the axial and radial directions, so that the gear is firmly fixed and will not move, thus ensuring the accuracy of the processing position and preventing the gear from becoming a scrap part due to processing position deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of the gear in an embodiment of the gear positioning tool of the utility model;

[0017] Figure 2 This is a cross-sectional schematic diagram of a gear in an embodiment of the gear positioning tool of the utility model;

[0018] Figure 3 This is a structural schematic diagram of an embodiment of the gear positioning tool of the utility model;

[0019] Figure 4 This is a schematic structural diagram of a gear positioning tool according to an embodiment of the utility model when clamping a gear;

[0020] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0021] Figure 6 for Figure 5 Schematic diagram of the local structure at point A in the middle.

[0022] The meanings of the symbols in the accompanying drawings are:

[0023] Gear 1, through hole 11, groove 12, supporting member 2, base 21, middle section 211, placement seat 212, mounting seat 213, through hole 214, first slot 215, spindle 22, embedded section 221, penetration section 222, insertion section 223, first flange 224, second flange 225, fixing nut 226, pressing member 3, connecting portion 31, pressing portion 32, clamping hole 33, second slot 34, limiting assembly 4, positioning block 41, positioning pin 42, mounting hole 43, stop block 44, elastic member 45, spherical top bead 46. DETAILED DESCRIPTION

[0024] The utility model will be further described below in conjunction with the accompanying drawings.

[0025] Please refer to Figure 1 and Figure 2 In order to more clearly explain the gear positioning tooling of the utility model, the appearance structure of the gear 1 is explained first. The gear 1 is a cylindrical structure as a whole, and the middle part of the gear 1 has an axial through hole 11. A groove 12 is provided on one axial side of the gear 1, and the groove 12 is in the shape of an arc concentric with the gear 1. There are several grooves 12, and several grooves 12 are arranged in a circle with the axis of the gear 1 as the center and are evenly spaced. Several grooves 12 are arranged on the side wall of the gear 1 at positions corresponding to the outer periphery of the through hole 11.

[0026] Reference Figure 3 and Figure 4 The gear positioning tool of the utility model is used to position the gear 1 to be processed during gear hobbing, and includes a supporting member 2 on which the gear 1 is sleeved, a pressing member 3 capable of pressing the gear 1 onto the supporting member 2, and a limiting assembly 4 provided on the supporting member 2. The supporting member 2 and the pressing member 3 cooperate with each other to limit the gear 1 in the axial and radial directions, and the limiting assembly 4 is used to limit the gear 1 in the circumferential direction to prevent the gear 1 from rotating.

[0027] The supporting member 2 includes a base 21 for placing the gear 1 and a core shaft 22 arranged on the base 21. The base 21 includes an intermediate section 211, a placement seat 212 and a mounting seat 213, and the intermediate section 211, the placement seat 212 and the mounting seat 213 are coaxially arranged. The placement seat 212 is arranged at one end of the intermediate section 211 close to the pressing member 3 for supporting the gear 1, and the outer diameter of the placement seat 212 is larger than the outer diameter of the intermediate section 211, and the outer diameter of the placement seat 212 is not smaller than the outer diameter of the gear 1. The mounting seat 213 is arranged at one end of the intermediate section 211 away from the pressing member 3 for connecting with an external processing platform to fix the base 21 on the processing platform. The outer diameter of the mounting seat 213 is larger than the outer diameter of the intermediate section 211, and the outer diameter of the mounting seat 213 is larger than the outer diameter of the placement seat 212, so that the placement of the base 21 can be more stable. The base 21 is provided with a through hole 214, and the through hole 214 penetrates the base 21 in the axial direction, that is, the through hole 214 sequentially penetrates the middle section 211, the placement seat 212 and the mounting seat 213. The base 21 is also provided with a first slot 215 connected with the through hole 214, and the first slot 215 is formed by a side of the placement seat 212 away from the middle section 211 and recessed toward the middle section 211, and the first slot 215 is coaxial with the through hole 214, and the inner diameter of the first slot 215 is larger than the inner diameter of the through hole 214 and smaller than the outer diameter of the gear 1.

[0028] The mandrel 22 is coaxially arranged with the base 21, and includes an embedded section 221, a penetration section 222, and an insertion section 223. The embedded section 221 is embedded in the base 21. Specifically, the outer diameter of the embedded section 221 matches the inner diameter of the through hole 214 and is arranged in the through hole 214. The end of the embedded section 221 close to the pressing piece 3 is coaxially provided with a first flange 224, and the outer diameter of the first flange 224 is larger than the outer diameter of the embedded section 221. The end of the embedded section 221 away from the pressing piece 3 extends outwardly from the through hole 214, and a fixing nut 226 is screwed on a section of the embedded section 221 extending out of the base 21. When the embedded section 221 is fixed on the base 21, a side wall of the first flange 224 close to the embedded section 221 abuts against the bottom wall of the first slot 215, and the mandrel 22 is fixed on the base 21 under the cooperation of the first flange 224 and the fixing nut 226. The penetration section 222 is provided on a side of the embedded section 221 close to the pressing piece 3 and protrudes from the base 21 to a side close to the pressing piece 3. A second flange 225 is coaxially provided at one end of the penetration section 222 away from the embedded section 221, and the outer diameter of the second flange 225 is larger than the outer diameter of the penetration section 222. The outer diameter of the second flange 225 matches the inner diameter of the through hole 11 so that it can be penetrated in the through hole 11, thereby playing a role in radial positioning of the gear 1. The inserting section 223 is disposed at one end of the penetrating section 222 away from the embedding section 221 , and an outer diameter of the inserting section 223 is smaller than an outer diameter of the second protruding edge 225 .

[0029] The pressing part 3 has a connecting portion 31 connected to an external power device and a pressing portion 32 for pressing the hobbing. The outer diameter of the pressing portion 32 is not less than the outer diameter of the gear 1. The connecting portion 31 is coaxially arranged with the pressing portion 32 and is located on the side of the pressing portion 32 away from the supporting member 2. The connecting portion 31 is used to connect with an external power device. When the gear 1 is placed on the base 21, the external power device drives the pressing part 3 to move toward the supporting member 2 to press the gear 1 onto the supporting member 2. The connecting portion 31 and the pressing portion 32 are jointly provided with a clamping hole 33 for clamping the core shaft 22. The clamping hole 33 is coaxial with the connecting portion 31 and the pressing portion 32. The clamping hole 33 is formed by the side of the pressing portion 32 facing the supporting member 2 and recessed toward the connecting portion 31. The clamping hole 33 axially penetrates the pressing portion 32 and extends into the connecting portion 31. The inner diameter of the locking hole 33 matches the outer diameter of the insertion section 223 so that the insertion section 223 can be locked into the locking hole 33. The pressing portion 32 is provided with a second slot 34 on the side facing the supporting member 2, that is, the second slot 34 is formed by the pressing portion 32 on the side facing the supporting member 2 in a direction away from the supporting member 2, and the second slot 34 is coaxially provided with the locking hole 33 and communicates with the locking hole 33. The inner diameter of the second slot 34 is larger than the inner diameter of the locking hole 33 and larger than the outer diameter of the second protrusion 225.

[0030] Reference Figure 5 and Figure 6, the limiting assembly 4 includes a positioning block 41 and an elastic limiting member arranged in the positioning block 41. The positioning block 41 is convexly arranged on the side of the supporting member 2 facing the pressing member 3 and is connected to the supporting member 2 through a positioning pin 42. The positioning pin 42 is arranged along the axial direction of the supporting member 2. Specifically, the positioning pin 42 is arranged at a position corresponding to the first slot 215 on the placement seat 212, and one end of the positioning pin 42 away from the pressing member 3 is buried in the placement seat 212, and the other end protrudes from the placement seat 212. The positioning block 41 is provided with a socket matching the positioning pin 42 so that one end of the positioning pin 42 protruding from the placement seat 212 can be inserted therein. The cross section of the positioning block 41 is an arc-shaped that matches the groove 12 so that it can be matched with the groove 12. A mounting hole 43 for mounting the elastic limiting member is provided on a circumferential side wall of the positioning block 41. The number of the positioning blocks 41 is several, and the positioning blocks 41 are spaced apart in a circle with the center of the core shaft 22 as the center. In the embodiment shown, the number of the positioning blocks 41 is two, and the two positioning blocks 41 can extend into two adjacent grooves 12 respectively, and respectively abut against two adjacent side walls of the two grooves 12 to position the gear 1. In other embodiments, the number of the positioning blocks 41 can also continue to increase, as long as they can match the grooves 12 on the gear 1. The elastic limiter is provided at one end of the positioning block 41 away from the positioning pin 42, and includes a stopper 44 and an elastic member 45. The elastic member 45 is provided in the mounting hole 43 along the length direction of the mounting hole 43, and the stopper 44 is connected to one end of the elastic member 45 away from the bottom wall of the mounting hole 43, and one end of the stopper 44 away from the elastic member 45 extends out of the mounting hole 43 so as to abut against the corresponding inner wall on the circumference of the groove 12. The outer diameter of the stopper 44 gradually decreases from close to the elastic member 45 to far away from the elastic member 45. A spherical top bead 46 is provided on the side of the stopper 44 far away from the elastic member 45 (i.e., the side abutting against the groove 12). The spherical top bead 46 can rotate relative to the stopper 44 under the condition of external force. The spherical top bead 46 is used to directly abut against the inner wall of the groove 12, so that the positioning block 41 can be closely fitted with the groove 12, and the contact area with the groove 12 can be reduced to avoid the stopper 44 from rubbing against the inner wall of the groove 12 over a large area to cause damage to the gear 1. At the same time, the spherical top bead 46 can rotate, so that there will be no friction with the inner wall of the groove 12, which effectively protects the inner wall of the groove 12. In the embodiment shown, the elastic member 45 is a coil spring. In other embodiments, the elastic member 45 can also be a spring sheet, as long as it can drive the stopper 44 to reset so that the stopper 44 always abuts against the inner wall of the groove 12.

[0031] One embodiment of the gear positioning tool of the utility model works as follows: when fixing the gear 1, the gear 1 is inserted on the mandrel 22 with the groove 12 facing the support member 2, even if the mandrel 22 is inserted from the through hole 11, and the gear 1 is moved until the gear 1 abuts against the placement seat 212. In this process, the positioning block 41 is aligned with the position of the groove 12, so that the positioning block 41 is clamped into the corresponding groove 12. At this time, the stop block 44 moves toward the inside of the mounting hole 43 under the limit of the inner wall of the groove 12, and the elastic member 45 exerts a force on the stop block 44 away from the inside of the mounting hole 43, and the stop block 44 always maintains a close contact with the inner wall of the groove 12. If the positioning block 41 cannot be completely and tightly fitted with the groove 12 due to wear or other reasons, leaving a certain gap, then the stop block 44 can limit the positioning block 41 in the groove 12 under the elastic force of the elastic member 45 so that it will not shake. Under the action of the limit assembly 4, the gear 1 cannot rotate relative to the support member 2.

[0032] The external power device (not shown in the figure) is operated to drive the pressing member 3 to move toward the direction close to the supporting member 2, and the insertion section 223 is aligned with the clamping hole 33 and moves into the clamping hole 33 with the movement of the pressing member 3, until the pressing portion 32 faces the side of the supporting member 2 and abuts against the corresponding side of the gear 1. At this time, the gear 1 is pressed on the supporting member 2 by the pressing member 3 and cannot move axially. Because the outer diameter of the second convex edge 225 matches the inner diameter of the through hole 11, the gear 1 cannot move radially under this limiting action.

Claims

1. A gear positioning tool, used for positioning a gear to be processed during gear hobbing, comprising a supporting member on which the gear is sleeved and a pressing member capable of pressing the gear onto the supporting member, characterized in that: It also includes a limiting assembly arranged on the supporting member for circumferentially limiting the gear to prevent the gear from rotating, the limiting assembly includes a positioning block and an elastic limiting member arranged in the positioning block, the positioning block is convexly arranged on the side of the supporting member facing the pressing member, the axial side of the gear has a groove, the positioning block matches the groove so as to be inserted therein, The elastic limiting member abuts against the inner wall of the groove and elastically expands and contracts along the circumferential direction of the hobbing gear.

2. The gear positioning tool as claimed in claim 1, characterized in that: The gear has an axial through hole in the middle, the supporting member includes a base and a core shaft arranged on the base, the outer diameter of the core shaft matches the inner diameter of the through hole so that it can be inserted therein, and the pressing member has a clamping hole matching the core shaft on one side facing the supporting member.

3. The gear positioning tool as claimed in claim 2, characterized in that: The base is provided with a positioning pin along its own axial direction on one side facing the pressing part, one end of the positioning pin away from the pressing part is buried in the base, and the other end extends out of the base, and the positioning block is provided with a socket matching the positioning pin so that the end of the positioning pin extending out of the base can be inserted therein.

4. The gear positioning tool as claimed in claim 3, characterized in that: The elastic limiting member is arranged at one end of the positioning block away from the positioning pin, and includes a stop block and an elastic member. A mounting hole is opened on one circumferential side wall of the positioning block. The elastic member is arranged in the mounting hole along the length direction of the mounting hole. The stop block is connected to one end of the elastic member away from the bottom wall of the mounting hole. One end of the stop block away from the elastic member extends out of the mounting hole so as to be able to abut against the inner wall of the groove.

5. The gear positioning tool as claimed in claim 4, characterized in that: The elastic member is a coil spring.

6. The gear positioning tool as claimed in claim 2, characterized in that: The number of the positioning blocks is several, and the positioning blocks are spaced apart and distributed in a circle with the center of the core shaft as the center.

7. The gear positioning tool as claimed in claim 2, characterized in that: The core shaft has an embedded section, a penetration section and an insertion section, the embedded section is embedded in the base, the penetration section is arranged on a side of the embedded section close to the pressing part and protrudes from the base to a side close to the pressing part, the insertion section is arranged at one end of the penetration section away from the embedded section and the outer diameter of the insertion section matches the inner diameter of the clamping hole.

8. The gear positioning tool as claimed in claim 7, characterized in that: The base is provided with a through hole for the embedded section to be embedded therein, and the through hole passes through the base axially. A first protrusion is provided between the embedded section and the penetration section, and the outer diameter of the first protrusion is greater than the inner diameter of the through hole. One end of the embedded section away from the first protrusion extends outward from the base, and a section of the embedded section extending out of the base is threaded with a fixing nut.

9. The gear positioning tool as claimed in claim 1, characterized in that: The pressing part has a connecting part connected to an external power device and a pressing part for pressing the rolling gear. The pressing part is arranged at one end of the connecting part close to the supporting part, and the outer diameter of the pressing part is larger than the outer diameter of the connecting part.

10. The gear positioning tool as claimed in claim 2, characterized in that: The base includes a middle section, a placement seat and a mounting seat. The placement seat is arranged at one end of the middle section close to the pressing piece to support the gear, and the outer diameter of the placement seat is larger than the outer diameter of the middle section. The mounting seat is arranged at one end of the middle section away from the pressing piece to fix the base on the processing platform, and the outer diameter of the mounting seat is larger than the outer diameter of the middle section.

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