Indexing chucking mechanism for hybrid transmission shift hubs

Abstract

The utility model relates to the technical field of fixture, and disclose a kind of indexing clamping mechanism of hybrid power transmission gear shift hub, including bottom plate, compression structure, indexing rotary table, axial limit seat, support shaft and circumferential positioning ring;Compression structure includes first support, corner cylinder, set swing bar, shaft sleeve, follow-up shaft and pressure head;Gear shift hub is encased in support shaft.This indexing clamping mechanism of hybrid power transmission gear shift hub provided by the utility model, by setting compression structure in the non-taken piece side of support shaft, and in the corner cylinder piston rod extension state, swing bar and pressure head are towards first support, avoid setting compression structure in the front of indexing equipment and reserving a lot of operating space, significantly shorten the overall length of indexing clamping mechanism, reduce the occupancy to machine tool space, so that more other fixtures can be arranged simultaneously on machine tool, facilitate to carry out coherent processing, improve the space utilization and production efficiency of machine tool.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to an indexing clamping mechanism for a hybrid power transmission shift hub. Background Technology

[0002] In the manufacturing process of hybrid transmissions, the shift hub, as a key transmission component, directly affects the shifting performance and operational stability of the transmission due to the machining accuracy of the positioning grooves and guide grooves on its outer circumference. Typically, the shift hub needs to be mounted in an indexing clamping mechanism on a CNC machine tool, where precise angular positioning is achieved through indexing equipment, and then the positioning grooves and guide grooves are machined by the CNC machine tool.

[0003] To improve processing efficiency and ensure the stability of the shift hub during machining, an automatic clamping structure needs to be installed in the indexing and clamping mechanism to reliably clamp the shift hub in conjunction with the indexing equipment. Specifically, after the shift hub is installed onto the support shaft of the indexing equipment, the automatic clamping structure needs to act quickly to clamp and fix the shift hub, avoiding positioning deviations caused by vibration during machining.

[0004] However, in existing technologies, the automatic clamping structure is typically positioned directly in front of the indexing device, and sufficient operating space must be reserved between the automatic clamping structure and the indexing device to facilitate the loading and unloading of the shift hub. While this layout meets basic clamping and unloading requirements, it significantly increases the overall length of the indexing and clamping mechanism. An excessively long structure occupies more machine tool space, limiting the ability to simultaneously arrange other fixtures for continuous machining on the machine tool.

[0005] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an indexing and clamping mechanism for the shift hub of a hybrid transmission, which aims to shorten the overall length of the indexing and clamping mechanism and reduce the space occupied by the machine tool.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The indexing and clamping mechanism for the shift hub of a hybrid transmission includes a base plate, a clamping structure mounted on the base plate, an indexing turntable mounted on the base plate and extending laterally from the output shaft, an axial limiting seat mounted on the turntable of the indexing turntable, a support shaft laterally positioned at the central axis of the end of the axial limiting seat, and a circumferential positioning ring surrounding the support shaft. The clamping structure includes a first bracket mounted on the non-removing side of the support shaft, a rotary cylinder mounted on the first bracket, a rocker arm mounted on the output end of the rotary cylinder, a bushing mounted on the end of the rocker arm away from the rotary cylinder, a follower shaft rotatably mounted within the bushing, and a pressure head fixed to the output end of the follower shaft. The shift hub is mounted on the support shaft. When the piston rod of the rotary cylinder is retracted, the rotary cylinder drives the rocker arm to swing towards the shift hub, making the pressure head coaxial with the shift hub, and then driving the pressure head to press against the shift hub. When the piston rod of the rotary cylinder is extended, the rocker arm and the pressure head face the first bracket.

[0009] As a further improvement to the above technical solution, the circumferential positioning ring has a C-shaped structure, forming a groove for the rear of the shift hub to be inserted, and a ball-head plunger facing the groove is provided on one end of the circumferential positioning ring.

[0010] As a further improvement to the above technical solution, the end face of the axial limiting seat is provided with a plurality of precision-enhanced protrusions arranged in a circumferential array, and the precision-enhanced protrusions abut against the tail of the shift hub.

[0011] As a further improvement to the above technical solution, the insertion end of the support shaft is chamfered.

[0012] As a further improvement to the above technical solution, the first bracket is provided with an upper limit block and a lower limit block to keep the swing arm extending longitudinally.

[0013] As a further improvement to the above technical solution, the pressure head has a circular block structure and an avoidance groove is provided on the end face facing the shift hub.

[0014] As a further improvement to the above technical solution, a second bracket is provided on the base plate, and a water jet head is provided on the second bracket to spray water toward the shift hub.

[0015] As a further improvement to the above technical solution, the rotary cylinder is a rotary hydraulic cylinder.

[0016] The beneficial effects of this utility model are as follows: Compared with the prior art, the indexing and clamping mechanism for the hybrid transmission shift hub provided by this utility model, by setting the clamping structure on the non-part-removing side of the support shaft, and with the rocker arm and pressure head facing the first bracket when the piston rod of the rotary cylinder is extended, avoids the situation of setting the clamping structure directly in front of the indexing equipment and reserving a large amount of operating space. This significantly shortens the overall length of the indexing and clamping mechanism, reduces the space occupied by the machine tool, and allows more other fixtures to be arranged on the machine tool at the same time, which is convenient for continuous processing and improves the space utilization and production efficiency of the machine tool. Attached Figure Description

[0017] Figure 1 A perspective view of the indexing and clamping mechanism provided by this utility model.

[0018] Figure 2 A perspective view of the shift hub being installed onto the indexing clamping mechanism.

[0019] Figure 3 A perspective view showing the indexing and clamping mechanism clamping the shift hub.

[0020] Figure 4 for Figure 1 A magnified view of a portion of region L in the middle.

[0021] Figure 5 This is a schematic diagram of the rear structure of the gear shift hub.

[0022] Explanation of main component symbols: 1-base plate, 2-clamping structure, 21-first bracket, 22-angle cylinder, 23-swing rod, 24-shaft sleeve, 25-follower shaft, 26-pressure head, 3-indexing turntable, 4-axial limit seat, 41-precision protrusion, 5-support shaft, 6-circumferential positioning ring, 61-slot, 62-ball plunger, 71-upper limit block, 72-lower limit block, 81-second bracket, 82-flushing head, 9-shift hub, 91-fan-shaped block, 92-positioning groove, 93-guide groove. Detailed Implementation

[0023] This utility model provides an indexing and clamping mechanism for the shift hub 9 of a hybrid power transmission. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.

[0024] Please see Figures 1 to 5This utility model provides an indexing and clamping mechanism for a hybrid power transmission shift hub, including a base plate 1, a clamping structure 2 on the base plate 1, an indexing turntable 3 on the base plate 1 with the output shaft extending laterally, an axial limiting seat 4 on the turntable of the indexing turntable 3, a support shaft 5 laterally positioned at the central axis position at the end of the axial limiting seat 4, and a circumferential positioning ring 6 surrounding the support shaft 5; the clamping structure 2 includes a first bracket 21 on the non-removal side of the support shaft 5, a rotary cylinder 22 on the first bracket 21, and a circumferential positioning ring 6 on the rotary cylinder 22. The structure includes a rocker arm 23 at the output end, a bushing 24 at the end of the rocker arm 23 away from the angle cylinder 22, a follower shaft 25 rotatably disposed within the bushing 24, and a pressure head 26 fixed at the output end of the follower shaft 25. The shift hub 9 is mounted on the support shaft 5. When the piston rod of the angle cylinder 22 is retracted, the angle cylinder 22 drives the rocker arm 23 to swing toward the shift hub 9, making the pressure head 26 coaxial with the shift hub 9, and then driving the pressure head 26 to press against the shift hub 9. When the piston rod of the angle cylinder 22 is extended, the rocker arm 23 and the pressure head 26 face the first bracket 21.

[0025] During the clamping stage, the operator mounts the shift hub 9 onto the support shaft 5. At this time, the inner hole of the shift hub 9 mates with the support shaft 5 to achieve initial centering. The circumferential positioning ring 6 provides circumferential limitation on the outer circumferential surface of the shift hub 9, and the axial limiting seat 4 initially restricts the axial position of the shift hub 9. Then, the clamping structure 2 is activated, and the piston rod of the angle cylinder 22 switches from the extended state to the retracted state. During this process, the angle cylinder 22 drives the rocker arm 23 to swing towards the shift hub 9. As the rocker arm 23 swings, the bushing 24, the follower shaft 25, and the pressure head 26 move together. When the rocker arm 23 swings to make the pressure head 26 coaxial with the shift hub 9, the angle cylinder 22 further drives the pressure head 26 closer to the shift hub 9 and finally presses the shift hub 9 against the axial limiting seat 4, completing the clamping and fixing of the shift hub 9.

[0026] Upon entering the machining stage, the indexing rotary table 3 begins operation. Its output shaft drives the turntable to rotate, which in turn drives the shift hub 9 to rotate synchronously via the axial limit seat 4 and the support shaft 5. This achieves precise angular indexing and positioning, allowing the CNC machine tool to cut the positioning groove 92 and guide groove 93 on the outer circumferential surface of the shift hub 9. During machining, the pressure head 26 maintains a pressing state on the shift hub 9. Combined with the functions of the circumferential positioning ring 6 and the axial limit seat 4, this ensures that the shift hub 9 will not experience positioning deviations due to vibration or other factors during machining. It can be understood that when the shift hub 9 rotates at the indexing point, the pressure head 26 rotates synchronously with the shift hub 9 under the action of the follower shaft 25.

[0027] After processing is completed, the part is released and removed. The piston rod of the rotary cylinder 22 switches from the retracted state to the extended state. At this time, the rotary cylinder 22 drives the rocker arm 23 to swing towards the first bracket 21. The rocker arm 23 drives the bushing 24, the follower shaft 25 and the pressure head 26 to move together, so that the pressure head 26 is disengaged from the shift hub 9 and faces the first bracket 21. The operator can then remove the processed shift hub 9 from the support shaft 5 to complete the entire processing process.

[0028] Compared with the prior art, the indexing and clamping mechanism of the hybrid transmission shift hub 9 provided by this utility model, by setting the clamping structure 2 on the non-part-removing side of the support shaft 5, and with the rocker arm 23 and the pressure head 26 facing the first bracket 21 when the piston rod of the rotary cylinder 22 is extended, avoids the situation of setting the clamping structure 2 directly in front of the indexing equipment and reserving a large amount of operating space, significantly shortens the overall length of the indexing and clamping mechanism, reduces the occupation of machine tool space, and allows more other fixtures to be arranged on the machine tool at the same time, which is convenient for continuous processing and improves the space utilization and production efficiency of the machine tool.

[0029] During loading and unloading, the piston rod of the angle cylinder 22 extends, and the swing rod 23 and the pressure head 26 face the first bracket 21, which does not obstruct the loading and unloading operation of the shift hub 9. Operators can easily and quickly complete the installation and removal of the shift hub 9, improving loading and unloading efficiency. When the piston rod of the angle cylinder 22 retracts, the swing rod 23 drives the pressure head 26 to swing towards the shift hub 9 and presses it against the shift hub 9 coaxially. This coaxial pressing method ensures that the force exerted by the pressure head 26 on the shift hub 9 is uniform and stable, effectively avoiding positioning deviations caused by loosening or vibration of the shift hub 9 during processing, ensuring the machining accuracy of the positioning groove 92 and the guide groove 93, and thus improving the shifting performance and operational stability of the hybrid transmission.

[0030] Specifically, the circumferential positioning ring 6 has a C-shaped structure, forming a groove 61 for the tail of the shift hub 9 to be engaged. This effectively wraps around and limits the fan-shaped block 91 at the tail of the shift hub 9, constraining the shift hub 9 circumferentially and reducing circumferential movement of the shift hub 9 due to vibration or force during processing. Simultaneously, a ball-head plunger 62, with one end of the circumferential positioning ring 6 facing the groove 61, can, after the tail of the shift hub 9 is engaged in the groove 61, use the elastic clamping force of the ball head to make close contact with the fan-shaped block 91, further eliminating the gap between the fan-shaped block 91 and the groove 61. This ensures precise positioning of the shift hub 9 in the circumferential direction, providing a reliable basic positioning guarantee for the subsequent angular indexing machining of the shift hub 9 by the indexing turntable 3, and reducing the problem of insufficient machining accuracy of the positioning groove 92 and guide groove 93 due to circumferential positioning deviations.

[0031] Because the rear end face of the shift hub 9 has multiple uneven structures, if the axial limiting seat 4 were to abut against the rear end face with a flat surface, the uneven structure would result in a small actual contact area and uneven force, making it difficult to achieve precise axial positioning. Therefore, the end face of the axial limiting seat 4 is provided with multiple circumferentially arrayed precision-machined protrusions 41 (i.e., the contact surfaces of the protrusions are precision-machined). These precision-machined protrusions 41 abut against the flat rear end face of the shift hub 9, avoiding the uneven structure and ensuring that each precision-machined protrusion 41 is in close contact with the flat surface. This design, through precise contact point distribution, effectively eliminates axial positioning deviations caused by the unevenness of the rear end face, providing a stable and consistent axial reference for the shift hub 9 and ensuring the axial dimensional accuracy of the positioning groove 92 and guide groove 93 during subsequent machining.

[0032] To reduce the installation difficulty for operators, the insertion end of the support shaft 5 is chamfered. The inclined guide surface formed by the chamfer can guide the inner hole of the shift hub 9. Even if there is a certain coaxiality deviation between the inner hole of the shift hub 9 and the support shaft 5, the shift hub 9 can gradually adjust its position along the inclined surface under the guidance of the chamfer and smoothly fit into the support shaft 5, making the installation process smoother and more convenient.

[0033] Preferably, the first bracket 21 is provided with an upper limit block 71 and a lower limit block 72 to keep the rocker arm 23 extending longitudinally. The upper limit block 71 and the lower limit block 72 work together to strictly limit the position of the rocker arm 23 in the longitudinal direction, so that it can stably maintain the longitudinal extension state. When the piston rod of the rotary cylinder 22 is in the retracted state, the rocker arm 23 is located between the upper limit block 71 and the lower limit block 72. At this time, the limit blocks can strictly limit the displacement of the rocker arm 23 in the longitudinal direction, so that it can stably maintain the longitudinal extension state. This stable posture can ensure that the pressure head 26 and the shift hub 9 always remain coaxial, avoiding the rocker arm 23 from shifting due to vibration or external force interference during the processing, thereby preventing coaxiality deviation between the pressure head 26 and the shift hub 9, ensuring that the clamping force of the pressure head 26 on the shift hub 9 is uniform and stable, and providing a reliable positioning basis for the processing of the shift hub 9.

[0034] The pressure head 26 has a circular block structure, and its front face facing the shift hub 9 can provide a large contact area, which can transmit the driving force of the angle cylinder 22 to the shift hub 9 more evenly, avoid deformation of the shift hub 9 due to excessive local force, and reduce the small displacement caused by vibration during the processing, ensuring that the shift hub 9 always maintains a stable positioning state during the cutting process, and providing a reliable guarantee for the high-precision machining of the positioning groove 92 and the guide groove 93.

[0035] The head of the shift hub 9 may have uneven structures such as protrusions and ribs. The clearance groove on the end face of the pressure head 26 can precisely match these special structures, avoiding the protruding parts during the clamping process and preventing hard interference between the pressure head 26 and the non-flat end face of the shift hub 9. This not only avoids damage to the head structure of the shift hub 9 due to compression, but also ensures that the pressure head 26 only contacts the flat end face of the shift hub 9, ensuring effective transmission of clamping force and further improving the reliability of clamping.

[0036] Preferably, the base plate 1 is provided with a second bracket 81, and the second bracket 81 is provided with a water jet head 82 for spraying water toward the shift hub 9. During the cutting process of the shift hub 9, the CNC machine tool sprays cutting fluid to cool the tool and the machining area, and at the same time generates a large amount of chips. The water jet head 82 on the second bracket 81 sprays water toward the shift hub 9, which can quickly wash away the residual cutting fluid and chips during machining gaps or after machining, ensuring that the surface of the shift hub 9 and the inside of the positioning groove 92 and guide groove 93 are clean, providing a clean machining reference for the next indexing positioning or subsequent processes, thereby ensuring the consistency of machining accuracy of each positioning groove 92 and guide groove 93.

[0037] In this embodiment, the rotary cylinder 22 is a rotary hydraulic cylinder. Powered by hydraulic pressure, the rotary hydraulic cylinder can output a greater driving torque and axial clamping force compared to a pneumatic rotary cylinder 22. During the process of swinging the rocker arm 23 until the pressure head 26 is coaxial with the shift hub 9, it ensures that the rocker arm 23 moves quickly and accurately, avoiding jamming or positioning deviation due to insufficient power. When driving the pressure head 26 to press against the shift hub 9, the strong axial force allows the pressure head 26 and the shift hub 9 to fit tightly together, effectively preventing the shift hub 9 from loosening even under significant vibrations generated during CNC machine tool cutting, thus significantly improving the stability of the clamping.

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. An indexing and clamping mechanism for the shift hub of a hybrid transmission, characterized in that, The system includes a base plate, a clamping structure mounted on the base plate, an indexing turntable mounted on the base plate and extending laterally from the output shaft, an axial limiting seat mounted on the turntable of the indexing turntable, a support shaft laterally positioned at the central axis of the end of the axial limiting seat, and a circumferential positioning ring surrounding the support shaft. The clamping structure includes a first bracket mounted on the non-part-removing side of the support shaft, a rotary cylinder mounted on the first bracket, a rocker arm mounted on the output end of the rotary cylinder, a bushing mounted on the end of the rocker arm away from the rotary cylinder, a follower shaft rotatably mounted within the bushing, and a pressure head fixed to the output end of the follower shaft. A shift hub is mounted on the support shaft. When the piston rod of the rotary cylinder is retracted, the rotary cylinder drives the rocker arm to swing towards the shift hub, making the pressure head coaxial with the shift hub, and then driving the pressure head to press against the shift hub. When the piston rod of the rotary cylinder is extended, the rocker arm and the pressure head face the first bracket.

2. The indexing and clamping mechanism for the shift hub of a hybrid transmission according to claim 1, characterized in that, The circumferential positioning ring has a C-shaped structure, forming a slot for the rear of the shift hub to engage. One end of the circumferential positioning ring is provided with a ball-head plunger facing the slot.

3. The indexing and clamping mechanism for the shift hub of a hybrid transmission according to claim 1, characterized in that, The end face of the axial limiting seat is provided with a plurality of precision-enhanced protrusions arranged in a circumferential array, and the precision-enhanced protrusions abut against the tail of the shift hub.

4. The indexing and clamping mechanism for the shift hub of a hybrid transmission according to claim 1, characterized in that, The insertion end of the support shaft is chamfered.

5. The indexing and clamping mechanism for the shift hub of a hybrid transmission according to claim 1, characterized in that, The first bracket is provided with an upper limit block and a lower limit block to keep the swing arm extending longitudinally.

6. The indexing and clamping mechanism for the shift hub of a hybrid transmission according to claim 1, characterized in that, The pressure head has a circular block structure and a clearance groove is provided on the end face facing the shift hub.

7. The indexing and clamping mechanism for the shift hub of a hybrid transmission according to claim 1, characterized in that, The base plate is provided with a second bracket, and the second bracket is provided with a water jet head that sprays water toward the shift hub.

8. The indexing and clamping mechanism for the shift hub of a hybrid transmission according to any one of claims 1-7, characterized in that, The corner cylinder is a corner hydraulic cylinder.

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