A pitch circle positioning fixture for inner ring heat post machining

By combining pitch circle positioning and end face clamping fixture design, the problems of deformation and positioning error caused by lack of axial constraint in the hot turning of internal gear rings were solved, realizing accurate positioning and stable machining of internal gear rings and improving machining quality.

CN224509039UActive Publication Date: 2026-07-17WENLING MINGHUA GEAR
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
WENLING MINGHUA GEAR
Filing Date
2025-08-12
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The existing internal gear ring fixtures lack axial restraint during hot turning, which leads to axial runout and deformation during internal gear ring machining, affecting machining quality.

Method used

By combining the pitch circle positioning component and the end face clamping component, precise radial positioning is achieved through the pitch circle engagement between the positioning pin and the internal gear ring, and the internal gear ring is firmly fixed to the positioning surface of the fixture body by axial force to prevent displacement and deformation during the machining process.

Benefits of technology

Ensure that the machining datum of the internal gear ring is consistent with the design datum, reduce positioning and dimensional errors caused by heat treatment deformation, improve machining stability and accuracy, avoid tooth surface damage caused by hard contact, and improve the machining quality of the internal gear ring.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of pitch circle positioning fixture for inner gear ring hot post-machining, including fixture base, pitch circle positioning assembly, end face compression subassembly, driving assembly, fixture base includes the fixture body that its upper is equipped with inner column platform and outer ring platform;Pitch circle positioning assembly includes setting on the outer ring platform and go up, the positioning column of uniform distribution in the outside of go up, setting between inner column platform and go up and go up, the compression ring of setting in the top of go up;End face compression subassembly includes the fixed seat of radially being equipped with guide claw sliding slot, the pressure claw of sliding in guide claw sliding slot, setting on the radial guide rod of pressure claw, radial guide hole is opened in the fixed seat;Driving assembly includes lifting rod, lifting plate, upper return spring, lifting rod is connected with compression ring after being penetrated through fixed seat, lifting plate is set on the top of lifting rod, and hinge has connecting rod between lifting plate and radial guide rod, and upper return spring is set between fixed seat and lifting plate.The fixture is combined with end face compression in the mode of pitch circle positioning to clamp inner gear ring.
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Claims

1. A pitch circle positioning fixture for hot post machining of an inner ring, characterized by: It includes a clamp base (1), a pitch circle positioning assembly, an end face clamping assembly, and a drive assembly. The clamp base (1) includes a clamp body (2). The top surface of the clamp body (2) is provided with an inner column platform (5) located in the middle and an outer ring platform (6) surrounding the outer side of the inner column platform (5). The pitch circle positioning assembly includes an expansion sleeve (11), a positioning post (20), a cone sleeve (22), and a pressure ring (23). The expansion sleeve (11) is disposed on the outer ring platform (6). Several positioning posts (20) are evenly distributed circumferentially on the outer side of the expansion sleeve (11). The cone sleeve (22) is disposed between the inner column platform (5) and the expansion sleeve (11). The cone sleeve (22) moves downward to drive the expansion sleeve (11) to generate radial expansion, thereby pushing the positioning post (20) to press against the pitch circle of the inner gear ring (48). The pressure ring (23) is disposed on the top of the cone sleeve (22). The end face clamping assembly includes a fixed seat (24), a clamping claw (31), and a radial guide rod (32). The fixed seat (24) is located above the clamp seat (1). The fixed seat (24) has a plurality of guide claw grooves (29) radially opened. The fixed seat (24) has a radial guide hole (30) communicating with the guide claw grooves (29) along the thickness direction. The clamping claw (31) is slidably disposed in the guide claw grooves (29). The radial guide rod (32) is disposed on the clamping claw (31) and passes through the radial guide hole (30) that is slidably engaged with it. The drive assembly includes a lifting rod (33), a lifting plate (38), and an upper return spring (47). The lifting rod (33) passes through the fixed seat (24) and is connected to the pressure ring (23). The lifting plate (38) is located at the top of the lifting rod (33). Several connecting rods (43) are hinged between the lifting plate (38) and each radial guide rod (32). The hinge point between the connecting rod (43) and the lifting plate (38) is located on the upper inner side of the hinge point between the connecting rod (43) and the radial guide rod (32). The upper return spring (47) is located between the fixed seat (24) and the lifting plate (38). The upper return spring (47) is used to drive the lifting plate (38) to move upward to the initial position.

2. The pitch circle positioning fixture for the hot post-machining of an internal toothed ring according to claim 1, characterized in that: The expansion sleeve (11) has a frustum-shaped inner hole (12) with the small end facing downward in the middle. The outer wall of the expansion sleeve (11) has several openings (13) that communicate with the inner hole (12) in the circumferential direction. The outer wall of the cone sleeve (22) abuts against the hole wall of the inner hole (12). The cone sleeve (22) moves downward and drives the expansion sleeve (11) to expand radially along the openings (13).

3. The pitch circle positioning fixture for the thermal post processing of an inner ring gear of claim 1, wherein: A connecting plate (36) is provided in the middle of the lifting rod (33), and a pressure sleeve (37) is sleeved on the lifting rod (33). The pressure sleeve (37) is connected to the bottom surface of the pressure ring (23) and presses and fixes the connecting plate (36) to the bottom surface of the pressure ring (23).

4. The pitch circle positioning fixture for the thermal post processing of an inner ring gear of claim 1, wherein: The outer wall of the expansion sleeve (11) is provided with several limiting ring grooves (14) in the circumferential direction. Each limiting ring groove (14) is provided with a limiting ring (16) that is in clearance fit with it. The outer wall of the limiting ring (16) is provided with several protruding teeth (18) in the circumferential direction. A fixing rod (19) is vertically arranged between the aligned upper and lower protruding teeth (18). The center of the positioning post (20) is provided with a core hole (21) for the fixing rod (19) to pass through and to be in clearance fit with it.

5. A pitch circle positioning fixture for hot post machining of an internal toothed ring according to claim 4, characterized in that: The wall of the limiting ring groove (14) is provided with several limiting grooves (15) in the circumferential direction. The inner wall of the limiting ring (16) is provided with several limiting blocks (17) that are embedded in the limiting grooves (15) in the circumferential direction. The limiting blocks (17) and the limiting grooves (15) are in clearance fit.

6. The pitch circle positioning fixture for the thermal post processing of an inner ring gear of claim 1, wherein: The top surface of the inner column (5) is provided with several insertion holes (28), the pressure ring (23) is provided with several through holes (26), the bottom surface of the fixing seat (24) is provided with several through holes (26) and the bottom surface of the upper connecting rod (25) abuts against the top surface of the inner column (5), and the bottom surface of the upper connecting rod (25) is provided with a lower connecting rod (27) that is interference-inserted into the insertion hole (28).

7. The pitch circle positioning fixture for the thermal post processing of an inner ring gear of claim 1, wherein: An inner hinge plate (39) is provided on the side wall of the lifting plate (38), and an inner hinge shaft (40) passes through the inner hinge plate (39). An outer hinge plate (41) is provided on the rod wall of the radial guide rod (32), and an outer hinge shaft (42) passes through the outer hinge plate (41). Several connecting rods (43) are hinged between the inner hinge plate (39) and the outer hinge plate (41). One end of the connecting rod (43) is hinged to the inner hinge plate (39) through the inner hinge shaft (40), and the other end is hinged to the outer hinge plate (41) through the outer hinge shaft (42).

8. The pitch circle positioning fixture for the thermal post processing of an inner ring gear of claim 1, wherein: The lifting plate (38) has a plurality of lifting guide holes (45) along the thickness direction. A plurality of lifting guide rods (46) are vertically arranged on the top surface of the fixed base (24). The lifting guide rods (46) pass through the lifting guide holes (45) that are slidably engaged with them. The upper reset spring (47) is sleeved on the lifting guide rods (46).

9. The pitch circle positioning fixture for the thermal post processing of an inner ring gear of claim 1, wherein: A centering hole (3) is provided at the center of the bottom surface of the clamping body (2). A stepped hole (8) penetrating the inner column (5) is provided on the top wall of the centering hole (3). A guide sleeve (9) fixed on the clamping body (2) is inserted into the stepped hole (8). A guide hole (10) is provided at the center of the top surface of the guide sleeve (9). The bottom of the lifting rod (33) is inserted into the guide hole (10) that slides with it.

10. A pitch circle positioning fixture for hot turning of an internal gear ring according to claim 9, characterized in that: A lower reset spring (35) is provided in the guide hole (10). The upper end of the lower reset spring (35) abuts against the bottom surface of the lifting rod (33), and the lower end of the lower reset spring (35) abuts against the bottom wall of the guide hole (10). The elastic force generated by the reset of the lower reset spring (35) will push the lifting rod (33) to the initial position.