Fixture for machining inner hole of special-shaped gear

Abstract

The utility model relates to a special-shaped gear inner hole machining clamp which comprises a base plate, a receding hole for machining a cutter is formed in the center of the base plate, a limiting arc plate is coaxially arranged on one radial side of the base plate, and the inner circumferential face of the limiting arc plate is attached to the tooth face of a special-shaped gear. The chassis is provided with a first positioning assembly for conducting circumferential rotation on the special-shaped gear and a second positioning assembly for conducting axial displacement on the special-shaped gear. The special-shaped gear comprises an arc part and a special-shaped part, the first positioning assembly comprises a first positioning pin and a second positioning pin, the first positioning pin is located on the special-shaped part, a positioning hole allowing the first positioning pin to penetrate through is formed in the special-shaped part, and the second positioning pin is located on the arc part and clamped in a tooth groove; the second positioning assembly comprises a base, a connecting rod and an abutting rod, the base is fixed to the top face of the limiting arc plate, the abutting rod is rotationally connected with the base through the connecting rod, and the abutting rod rotates to abut against or break away from the top face of the special-shaped gear. The special-shaped gear inner hole machining device has the effect of facilitating inner hole machining of the special-shaped gear.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fixture, especially a kind of fixture for special-shaped gear inner hole processing. BACKGROUND

[0002] Gear transmission is the most widely used transmission form, compared with other transmissions, it has the characteristics of large transmission power, wide speed range, high efficiency, reliable operation, long service life and compact structure. Since the development of gear, various functions have been extended, and various special-shaped structures have been developed for the designed functions.

[0003] The general gear shape is regular and circular, and three-jaw chuck is usually used for clamping during inner hole processing of general gear. The three clamping claws on the three-jaw chuck move simultaneously to achieve self-centering, and the three claws move simultaneously to abut against the outer wall of the general gear or move away from the outer wall of the general gear to achieve rapid clamping.

[0004] The three-jaw chuck is not convenient for clamping special-shaped gears, and if a special chuck is customized, it will cause increased cost and delayed delivery, so a clamp for special-shaped gear inner hole processing is needed. SUMMARY

[0005] In order to facilitate the inner hole processing of special-shaped gear, the application provides a clamp for special-shaped gear inner hole processing.

[0006] The clamp for special-shaped gear inner hole processing provided by the application adopts the following technical scheme:

[0007] A clamp for special-shaped gear inner hole processing, comprising a base plate, a let go hole for machining tool is arranged in the center of the base plate, a limiting arc plate is coaxially arranged on one side of the base plate in the radial direction, the inner peripheral surface of the limiting arc plate is in contact with the tooth surface of the special-shaped gear, a first positioning assembly for circumferential rotation of the special-shaped gear and a second positioning assembly for axial displacement of the special-shaped gear are arranged on the base plate.

[0008] The special-shaped gear includes a circular arc part and a special-shaped part, the first positioning assembly includes a first positioning pin and a second positioning pin, the first positioning pin is located in the special-shaped part, a positioning hole is arranged in the special-shaped part for the first positioning pin to pass through, the second positioning pin is located in the circular arc part, and the second positioning pin is clamped in the tooth groove.

[0009] Preferably, the second positioning assembly includes a base, a connecting rod and a stop rod, the base is fixed to the top surface of the limiting arc plate, the stop rod is rotatably connected to the base through the connecting rod, and the stop rod rotates to abut against or abut against the top surface of the special-shaped gear.

[0010] The base is provided with a first rounded corner and a second rounded corner at two ends, and the first rounded corner is closer to the special-shaped gear than the second rounded corner;

[0011] The connecting rod comprises a first rod body, a second rod body and a third rod body, one end of the first rod body is fixedly connected with the abutting rod, the other end of the first rod body is provided with a first protruding part and a second protruding part along the width direction of the first rod body, the first protruding part is located below the second protruding part, the first protruding part of the first rod body is rotationally connected with the first rounded corner of the base, the second protruding part of the first rod body is rotationally connected with one end of the second rod body in the length direction and forms a first hinge point, the second rod body is provided with a third protruding part protruding towards the base at a position close to the first rod body, the third protruding part is rotationally connected with one end of the third rod body and forms a second hinge point, the other end of the third rod body is rotationally connected with the second rounded corner of the base and forms a third hinge point, and the second hinge point is located between the first hinge point and the third hinge point.

[0012] When the one end of the second rod body away from the special-shaped gear is rotated upwards, the second hinge point moves upwards, the connecting lines of the first hinge point, the first hinge point and the first hinge point are in a triangular shape, the first rod body, the second rod body and the third rod body are in a relaxed state, and the abutting rod can be separated from the special-shaped gear.

[0013] When the one end of the second rod body away from the special-shaped gear is rotated downwards, the second hinge point moves downwards, the connecting lines of the first hinge point, the first hinge point and the first hinge point are in a straight line, the first rod body, the second rod body and the third rod body are in a locked state, and the abutting rod abuts against the top surface of the special-shaped gear.

[0014] Preferably, the second positioning assembly is provided in two groups, and the two groups of the second positioning assembly are symmetrically arranged at two ends of the arc part of the special-shaped gear.

[0015] Preferably, the base is further provided with a third positioning assembly, the third positioning assembly is arranged on the side of the special-shaped gear away from the limiting arc plate, and the third positioning assembly comprises a fixing sleeve, a limiting rod and an abutting spring.

[0016] Preferably, the limiting rod away from the profiled gear one end is provided with a handle, the length direction of the handle is perpendicular to the length direction of the limiting rod, and the limiting rod away from the profiled gear one end is fixedly connected to the middle of the length direction of the handle.

[0017] Preferably, the fixing assembly comprises a fixing block and a fixing bolt, the fixing block is provided with an accommodating space for accommodating the fixing sleeve, the fixing sleeve is fixed in the accommodating space, the bottom disc is provided with a threaded hole matched with the fixing bolt, the threaded rod part of the fixing bolt is threadedly connected in the threaded hole, and the nut part of the fixing bolt abuts against the top surface of the fixing block.

[0018] To sum up, the present application has the following beneficial technical effects:

[0019] When clamping the profiled gear, first pull the limiting rod away from the profiled gear, at the same time, the first rod body, the second rod body and the third rod body of the connecting rod are in a relaxed state, the arc part of the profiled gear is attached to the inner circumferential surface of the limiting arc plate, the first positioning pin passes through the positioning hole and the second positioning pin is clamped in the tooth groove, then the limiting rod is loosened, the limiting rod is automatically abutted against the profiled gear under the action of the abutting spring, then the second rod body end away from the profiled gear is turned downward, the first rod body, the second rod body and the third rod body are in a locked state, the abutting rod abuts against the top surface of the profiled gear, so that the profiled gear to be machined is completely positioned and will not be loose during machining, and clamping is stable and convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a whole structure schematic diagram of a clamp for profiled gear inner hole machining in the embodiment of the present application.

[0021] Figure 2 is a whole structure schematic diagram of a clamp for profiled gear inner hole machining in the embodiment of the present application, which is used to show the whole structure of the clamp for profiled gear inner hole machining after hiding the profiled gear.

[0022] Figure 3 is a structure schematic diagram of a second positioning assembly in the embodiment of the present application.

[0023] Figure 4 is a structure schematic diagram of a third positioning assembly in the embodiment of the present application.

[0024] Explanation of reference signs: 1, profile gear; 11, arc part; 12, profile part; 121, positioning hole; 2, base plate; 21, let go of the hole; 3, limit arc plate; 4, first positioning assembly; 41, first positioning pin; 42, second positioning pin; 5, second positioning assembly; 51, base; 511, first fillet; 512, second fillet; 52, connecting rod; 521, first rod body; 5211, first protruding part; 5212, second protruding part; 522, second rod body; 5221, third protruding part; 523, third rod body; 524, first hinging point; 525, second hinging point; 526, third hinging point; 53, abutting rod; 6, third positioning assembly; 61, fixed sleeve; 611, containing hole; 612, mounting ring groove; 62, limiting rod; 621, limiting ring table; 63, abutting spring; 64, handle; 7, fixing assembly; 71, fixed block; 72, fixed bolt. DETAILED DESCRIPTION

[0025] The following will be described in detail below in combination with the accompanying Figures 1-4 The application is further described in detail.

[0026] The application discloses a clamp for profile gear inner hole machining.

[0027] Reference Figures 1-4 The clamp for profile gear inner hole machining comprises a base plate 2, a let go of the hole 21 for machining tools is arranged in the center of the base plate 2, a limit arc plate 3 is coaxially arranged on one side of the base plate 2 in the radial direction, the inner peripheral surface of the limit arc plate 3 is attached to the tooth surface of the profile gear 1, and the base plate 2 is provided with a first positioning assembly 4 for circumferential rotation of the profile gear 1 and a second positioning assembly 5 for axial displacement of the profile gear 1.

[0028] The profile gear comprises an arc part 11 and a profile part 12, the first positioning assembly 4 comprises a first positioning pin 41 and a second positioning pin 42, the first positioning pin 41 is located in the profile part 12, a positioning hole 121 is arranged in the profile part 12 for the first positioning pin 41 to pass through, and the second positioning pin 42 is located in the arc part 11, two second positioning pins 42 are arranged and clamped in different tooth grooves.

[0029] Through the first positioning pin 41 and the second positioning pin 42, circumferential rotation of the profile gear 1 can be avoided.

[0030] The second positioning assembly 5 comprises a base 51, a connecting rod 52 and an abutting rod 53, the base 51 is fixed to the top surface of the limit arc plate 3, the abutting rod 53 is rotationally connected to the base 51 through the connecting rod 52, and the abutting rod 53 is rotated to abut or disengage from the top surface of the profile gear 1.

[0031] The base 51 is provided with a first rounded corner 511 and a second rounded corner 512, and the first rounded corner 511 is closer to the special-shaped gear 1 than the second rounded corner 512.

[0032] The connecting rod 52 comprises a first rod body 521, a second rod body 522 and a third rod body 523. One end of the first rod body 521 is fixedly connected with the abutting rod 53. The other end of the first rod body 521 is provided with a first protruding part 5211 and a second protruding part 5212 in the width direction of the first rod body 521. The first protruding part 5211 is located below the second protruding part 5212. The first protruding part 5211 of the first rod body 521 is rotationally connected with the first rounded corner 511 of the base 51. The second protruding part 5212 of the first rod body 521 is rotationally connected with one end of the second rod body 522 in the length direction and forms a first hinge point 524. The second rod body 522 is provided with a third protruding part 5221 protruding towards the base 51 at a position close to the first rod body 521. The third protruding part 5221 is rotationally connected with one end of the third rod body 523 and forms a second hinge point 525. The other end of the third rod body 523 is rotationally connected with the second rounded corner 512 of the base 51 and forms a third hinge point 526. The second hinge point 525 is located between the first hinge point 524 and the third hinge point 526.

[0033] When the second rod body 522 is rotated upwards away from one end of the special-shaped gear 1, the second hinge point 525 moves upwards. The connecting line of the first hinge point 524, the first hinge point 524 and the first hinge point 524 is triangular. The first rod body 521, the second rod body 522 and the third rod body 523 are in a relaxed state. The abutting rod 53 can be separated from the special-shaped gear 1.

[0034] When the second rod body 522 is rotated downwards away from one end of the special-shaped gear 1, the second hinge point 525 moves downwards. The connecting line of the first hinge point 524, the first hinge point 524 and the first hinge point 524 is a straight line. The first rod body 521, the second rod body 522 and the third rod body 523 are in a locked state. The abutting rod 53 abuts against the top surface of the special-shaped gear 1, thereby axially positioning the special-shaped gear 1 and avoiding axial displacement of the special-shaped gear 1.

[0035] The second positioning assembly 5 is provided in two groups, and the two groups of second positioning assemblies 5 are symmetrically arranged at the two ends of the arc part 11 of the special-shaped gear 1, thereby improving the uniformity of the stress of the special-shaped gear 1.

[0036] The third positioning assembly 6 is arranged on the chassis 2 and limits the special-shaped gear 1 in the radial direction, the third positioning assembly 6 is arranged on the side of the special-shaped gear 1 away from the limiting arc plate 3, and the third positioning assembly 6 comprises a fixing sleeve 61, a limiting rod 62 and a pressing spring 63, the fixing sleeve 61 is fixed on the chassis 2 through a fixing assembly 7, an end surface of the fixing sleeve 61 is provided with an accommodating hole 611 through which the limiting rod 62 passes, an inner peripheral wall of the accommodating hole 611 is provided with an installation ring groove 612 in which the pressing spring 63 is accommodated, the installation ring groove 612 penetrates through one end of the fixing sleeve 61 close to the special-shaped gear 1, one end of the limiting rod 62 close to the special-shaped gear 1 is coaxially connected with a limiting ring table 621, the limiting ring table 621 slides in the installation ring groove 612, one end of the pressing spring 63 abuts against the inner wall of the installation ring groove 612 away from the special-shaped gear 1, and the other end of the pressing spring 63 abuts against the outer wall of the limiting ring table 621 away from the special-shaped gear 1, the pressing spring 63 applies an acting force to the limiting ring table 621 to drive the limiting ring table 621 to move towards the special-shaped gear 1.

[0037] One end of the limiting rod 62 away from the special-shaped gear 1 is provided with a handle 64, the length direction of the handle 64 is perpendicular to the length direction of the limiting rod 62, and the one end of the limiting rod 62 away from the special-shaped gear 1 is fixedly connected to the middle of the length direction of the handle 64, so that the limiting rod 62 is pulled through the handle 64, and the convenience of operation is improved.

[0038] After the limiting rod 62 is pulled towards the direction away from the special-shaped gear 1, the limiting rod 62 can be loosened from the special-shaped gear 1.

[0039] The fixing assembly 7 comprises a fixing block 71 and a fixing bolt 72, the fixing block 71 is provided with an accommodating space for accommodating the fixing sleeve 61, the fixing sleeve 61 is fixed in the accommodating space, the chassis 2 is provided with a threaded hole matched with the fixing bolt 72, a screw rod portion of the fixing bolt 72 is threadedly connected to the threaded hole, and a nut portion of the fixing bolt 72 abuts against the top surface of the fixing block 71, so that the third positioning assembly 6 is installed on the chassis 2.

[0040] The implementation principle of the clamp for machining the inner hole of the special-shaped gear is as follows:

[0041] When the special-shaped gear 1 is clamped, first, the limiting rod 62 is pulled away from the special-shaped gear 1, at the same time, the first rod body 521, the second rod body 522 and the third rod body 523 of the connecting rod 52 are in a relaxed state, the arc part 11 of the special-shaped gear 1 is attached to the inner circumferential surface of the limiting arc plate 3, and the first positioning pin 41 passes through the positioning hole 121 and the second positioning pin 42 is clamped in the tooth groove, then the limiting rod 62 is released, the limiting rod 62 is automatically abutted against the special-shaped gear 1 under the action of the abutting spring 63, then the end of the second rod body 522 away from the special-shaped gear 1 is turned downward, the first rod body 521, the second rod body 522 and the third rod body 523 are in a locked state, the abutting rod 53 abuts against the top surface of the special-shaped gear 1, so that the special-shaped gear 1 to be machined is completely positioned and will not be loose during the machining process, the clamping is stable and the operation is convenient.

[0042] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A special-shaped gear hole processing clamp, characterized in that: The application relates to a machining tool, which comprises a base plate (2) with a central hole (21) for a machining tool, a limiting arc plate (3) coaxially arranged on the radial side of the base plate (2), the inner circumferential surface of the limiting arc plate (3) being matched with the tooth surface of a special-shaped gear (1), a first positioning assembly (4) for the circumferential rotation of the special-shaped gear (1) and a second positioning assembly (5) for the axial displacement of the special-shaped gear (1) being arranged on the base plate (2). The special-shaped gear comprises a circular arc part (11) and a special-shaped part (12), the first positioning assembly (4) comprises a first positioning pin (41) and a second positioning pin (42), the first positioning pin (41) is arranged on the special-shaped part (12), the special-shaped part (12) is provided with a positioning hole (121) for the first positioning pin (41), and the second positioning pin (42) is arranged on the circular arc part (11) and is clamped in a tooth groove.

2. The profile gear hole processing fixture according to claim 1, characterized in that: The second positioning assembly (5) comprises a base (51), a connecting rod (52) and a pressing rod (53), the base (51) is fixed to the top surface of the limiting arc plate (3), the pressing rod (53) is rotationally connected to the base (51) through the connecting rod (52), and the pressing rod (53) is rotationally connected to the top surface of the special-shaped gear (1) or is separated from the top surface of the special-shaped gear (1). The two ends of the base (51) are provided with a first round corner part (511) and a second round corner part (512), and the first round corner part (511) is closer to the special-shaped gear (1) than the second round corner part (512). The connecting rod (52) comprises a first rod body (521), a second rod body (522) and a third rod body (523), one end of the first rod body (521) is fixedly connected to the pressing rod (53), the other end of the first rod body (521) is provided with a first protruding part (5211) and a second protruding part (5212) along the width direction of the first rod body (521), the first protruding part (5211) is located below the second protruding part (5212), the first protruding part (5211) of the first rod body (521) is rotationally connected to the first round corner part (511) of the base (51), the second protruding part (5212) of the first rod body (521) is rotationally connected to one end of the second rod body (522) in the length direction and forms a first hinge joint (524), the second rod body (522) is provided with a third protruding part (5221) which protrudes towards the base (51) at the position close to the first rod body (521), the third protruding part (5221) is rotationally connected to one end of the third rod body (523) and forms a second hinge joint (525), the other end of the third rod body (523) is rotationally connected to the second round corner part (512) of the base (51) and forms a third hinge joint (526), and the second hinge joint (525) is located between the first hinge joint (524) and the third hinge joint (526). When the second rod body (522) rotates upward away from one end of the special-shaped gear (1), the second hinge point (525) moves upward, the line connecting the first hinge point (524), the first hinge point (524), and the first hinge point (524) is triangular, the first rod body (521), the second rod body (522), and the third rod body (523) are in a relaxed state, and the stop rod (53) can be separated from the special-shaped gear (1); When the second rod body (522) rotates downward away from one end of the special-shaped gear (1), the second hinge point (525) moves downward, the line connecting the first hinge point (524), the first hinge point (524), and the first hinge point (524) is a straight line, the first rod body (521), the second rod body (522), and the third rod body (523) are in a locked state, and the stop rod (53) abuts against the top surface of the special-shaped gear (1).

3. The special-shaped gear hole processing clamp according to claim 2, characterized in that: The second positioning assembly (5) is provided in two groups, and the two groups of second positioning assemblies (5) are symmetrically arranged at the two ends of the arc part (11) of the special-shaped gear (1).

4. The profile gear hole processing fixture according to claim 1, characterized in that: The third positioning assembly (6) is further arranged on the chassis (2), and the third positioning assembly (6) is arranged on the side of the special-shaped gear (1) away from the limiting arc plate (3). The third positioning assembly (6) comprises a fixing sleeve (61), a limiting rod (62), and an abutting spring (63). The fixing sleeve (61) is fixed to the chassis (2) by a fixing assembly (7). An accommodation hole (611) is formed in the end face of the fixing sleeve (61) for the limiting rod (62) to pass through. An installation ring groove (612) is formed in the inner circumferential wall of the accommodation hole (611) for accommodating the abutting spring (63). The installation ring groove (612) penetrates the end of the fixing sleeve (61) close to the special-shaped gear (1). The end of the limiting rod (62) close to the special-shaped gear (1) is coaxially connected to a limiting ring table (621). The limiting ring table (621) slides in the installation ring groove (612). One end of the abutting spring (63) abuts against the inner wall of the installation ring groove (612) away from the special-shaped gear (1). The other end of the abutting spring (63) abuts against the outer wall of the limiting ring table (621) away from the special-shaped gear (1). The abutting spring (63) applies a force to the limiting ring table (621) to move the limiting ring table (621) towards the special-shaped gear (1).

5. The profile gear hole processing fixture according to claim 4, characterized in that: A handle (64) is arranged at the end of the limiting rod (62) away from the special-shaped gear (1). The length direction of the handle (64) is perpendicular to the length direction of the limiting rod (62). The end of the limiting rod (62) away from the special-shaped gear (1) is fixedly connected to the middle part of the length direction of the handle (64).

6. The profile gear hole processing fixture according to claim 4, characterized in that: The fixing assembly (7) comprises a fixing block (71) and a fixing bolt (72), the fixing block (71) is provided with an accommodating space for accommodating the fixing sleeve (61), the fixing sleeve (61) is fixed in the accommodating space, the bottom plate (2) is provided with a threaded hole matched with the fixing bolt (72), and the threaded rod part of the fixing bolt (72) is screwed into the threaded hole, and the nut part of the fixing bolt (72) abuts against the top surface of the fixing block (71).

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