Limiting gear expansion sleeve clamp

Abstract

The application discloses a limiting gear expansion sleeve clamp, which comprises a clamping body, a pull rod and an expansion sleeve, the expansion sleeve is fixedly connected with the pull rod, a tapered head is formed on the upper end of the clamping body, the expansion sleeve is sleeved outside the tapered head and the two are matched through a taper surface, and the limiting gear expansion sleeve clamp further comprises a lower supporting seat used for abutting against and supporting the lower end surface of a workpiece and an upper pressing seat used for abutting against and pressing the upper end surface of the workpiece, the upper pressing seat and the lower supporting seat are both hollow; a stepped surface is arranged below the tapered head of the clamping body, the lower supporting seat is sleeved on the stepped surface and detachably connected with the stepped surface; a plurality of limiting columns are further protruded on the upper end surface of the lower supporting seat, a plurality of limiting grooves are correspondingly recessed on the lower end surface of the upper pressing seat, the limiting columns penetrate through the workpiece and are inserted into the limiting grooves; and the expansion sleeve is located in a cavity enclosed by the upper pressing seat and the lower supporting seat, and the upper end of the expansion sleeve does not expose the upper pressing seat. The structure is more stable in clamping and positioning and can play a good protection role and effectively prevent the entry of waste chips.

Description

Technical Field

[0001] This invention relates to the field of gear parts processing technology, and in particular to a limit gear expansion sleeve clamp. Background Technology

[0002] The timing gear assembly is a crucial component of an automotive timing system. In mechanical devices, it plays a vital role in determining the timing of related control functions, and is critical to the accuracy of ignition timing. Its performance directly impacts the vehicle's ride quality. The core component of the timing gear assembly includes thin, plate-like timing gear plates, characterized by a large inner diameter and small thickness.

[0003] Traditional gear machining fixtures are mainly tension-type structures, including a fixture body, a tie rod, and a tension sleeve. The tension sleeve is fixedly connected to the tie rod, and the upper end of the fixture body forms a conical head. The tension sleeve is fitted over the conical head, and the two fit together through the conical surface, tensioning the inner hole of the gear through the tension sleeve. Due to the special structure of the limiting gear plate, clamping using traditional gear machining fixtures is prone to unstable positioning, bending and deformation during external gear machining, high machining difficulty, and lack of protection during machining. Debris and other debris often get into the conical surface mating area between the tension sleeve and the conical head, requiring frequent cleaning. Therefore, a limiting gear tensioning fixture with more stable clamping and positioning and prevention of debris ingress is needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned problems and provide a limit gear expansion sleeve clamp, which has good clamping and positioning and protection effects and prevents waste chips from entering the clamp body.

[0005] The technical solution of this invention is: The limiting gear expansion sleeve clamp of the present invention includes a clamp body, a pull rod, and an expansion sleeve. The expansion sleeve is fixedly connected to the pull rod. The upper end of the clamp body forms a conical head. The expansion sleeve is sleeved on the outside of the conical head and the two are engaged by the conical surface. The limiting gear expansion sleeve clamp further includes a lower support seat for abutting against the lower end face of the workpiece and an upper pressing seat for pressing against the upper end face of the workpiece. Both the upper pressing seat and the lower support seat are hollow. The clamping body has a stepped surface below the conical head, and the lower support seat is sleeved on the stepped surface and abuts against it, and the two are detachably connected; the upper end face of the lower support seat also has a plurality of limiting posts protruding, and the lower end face of the upper clamping seat has a plurality of limiting grooves correspondingly recessed, the limiting posts penetrate the workpiece and are inserted into the limiting grooves; the expansion sleeve is located in the cavity enclosed by the upper clamping seat and the lower support seat, and the upper end of the expansion sleeve does not protrude from the upper clamping seat.

[0006] In the above structure, the expansion sleeve fixture not only tightens and positions the inner hole of the limiting gear workpiece, but also adds a lower support seat and an upper clamping seat to abut and position the upper and lower end faces of the workpiece. The limiting post is used to interlock with the workpiece and the limiting groove to further limit the position and prevent the three from rotating circumferentially. The clamping stability is higher. At the same time, the upper clamping seat and the lower support seat form a protective cover structure that hides the expansion sleeve, which can effectively prevent the waste chips from the external gear machining from entering the expansion sleeve and enhance the protection effect.

[0007] Furthermore, in the limiting gear expansion sleeve clamp described in this invention, the upper clamping seat includes a small cylindrical section, a conical diffusion section, and a large cylindrical section connected sequentially from top to bottom. The upper clamping seat adopts an upper-small and lower-large structure, which improves the stability of the structure and ensures more stable clamping and positioning.

[0008] Furthermore, in the limiting gear expansion sleeve clamp described in this invention, the inner diameter of the small cylindrical section is smaller than the outer diameter of the expansion sleeve, and the small cylindrical section is located in the area above the expansion sleeve, forming a relatively long protective section above the expansion sleeve.

[0009] Furthermore, in the limiting gear expansion sleeve clamp of the present invention, the upper outer periphery of the small cylindrical section has a connecting edge, and the connecting edge is provided with a connecting hole.

[0010] Furthermore, in the limiting gear expansion sleeve fixture described in this invention, the lower support seat has an outer cylindrical shape, and its internal hollow cavity is stepped, with the inner diameter decreasing from top to bottom, including a large-diameter section and a small-diameter section. This stepped hollow cavity design allows the upper end of the lower support seat to have a large inner diameter and a small wall thickness, ensuring its support and positioning function for the workpiece end face while also reserving a sufficiently large central area to ensure that it does not interfere with the tensioning effect of the expansion sleeve on the inner hole. Simultaneously, the lower end has a small inner diameter and a large wall thickness, ensuring the structural robustness and support stability of the entire lower support seat.

[0011] Furthermore, in the limiting gear expansion sleeve fixture of the present invention, the inner and outer diameters of the large diameter section of the hollow cavity of the lower support seat are equal to the inner and outer diameters of the large cylindrical section, respectively, to ensure that the lower support seat and the upper clamping seat exert consistent and balanced force on the workpiece, and to avoid unilateral overpressure causing the thin-sheet limiting gear workpiece to bend and deform laterally.

[0012] Furthermore, in the limiting gear expansion sleeve clamp described in this invention, the central axes of the lower support, upper clamping seat, expansion sleeve, and pull rod coincide with each other.

[0013] Furthermore, in the limiting gear expansion sleeve clamp described in this invention, the limiting columns are evenly distributed around the center of the lower support seat.

[0014] Furthermore, in the limiting gear expansion sleeve fixture of the present invention, the limiting post and the limiting groove are clamped together to improve the connection and positioning stability of the workpiece, the lower support seat and the upper clamping seat.

[0015] The beneficial effects of this invention are: Based on providing the internal hole tensioning and positioning function, this invention utilizes the lower support seat and the upper clamping seat to provide end face contact positioning for the upper and lower end faces of the workpiece. At the same time, limiting posts and limiting groove structures are designed on the lower support seat and the upper clamping seat to achieve the insertion positioning of the workpiece, ensuring the accurate installation position of the lower support seat, workpiece and upper clamping seat, improving the clamping and positioning accuracy and ensuring the installation stability.

[0016] The present invention can also utilize the upper clamping seat and the lower support seat to form an outer protective structure that is sleeved on the outside of the expansion sleeve, preventing various waste chips and impurities generated during the machining of the external teeth from entering the expansion sleeve, eliminating the need for frequent cleaning of the fixture, and extending its service life. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the present invention.

[0018] Figure 2 for Figure 1 A magnified view of the circled area. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings: Reference Figure 1 , Figure 2 As shown, this embodiment discloses a limiting gear expansion sleeve clamp, including a clamp body 1, a pull rod 2, and an expansion sleeve 3. The expansion sleeve 3 is fixedly connected to the pull rod 2. The upper end of the clamp body 1 forms a conical head, and the expansion sleeve 3 is sleeved on the conical head, with the two engaging through a conical surface. The limiting gear expansion sleeve clamp also includes a lower support seat 4 for abutting against and supporting the lower end face of the workpiece 8 and an upper pressing seat 5 for pressing against the upper end face of the workpiece 8. Both the upper pressing seat 5 and the lower support seat 4 are hollow. The central axes of the lower support seat 4, the upper pressing seat 5, the expansion sleeve 3, and the pull rod 2 coincide with each other.

[0020] The clamping body 1 has a stepped surface below the conical head, and the lower support 4 is fitted onto the stepped surface and abuts against it, with the two being detachably connected. The upper end face of the lower support 4 also has a plurality of limiting posts 6 protruding from it, and the limiting posts 6 are evenly distributed around the center of the lower support 4. The lower end face of the upper clamping seat 5 has a plurality of limiting grooves 7 correspondingly recessed, and the limiting posts 6 penetrate the workpiece 8 and are inserted into the limiting grooves 7, with the limiting posts 6 and the limiting grooves 7 engaging tightly.

[0021] The expansion sleeve 3 is located within the cavity enclosed by the upper clamping seat 5 and the lower support seat 4, and the upper end of the expansion sleeve 3 does not protrude from the upper clamping seat 5. Through the enclosed protective effect of the upper clamping seat 5 and the lower support seat 4, the expansion sleeve 3 and other components are effectively protected, preventing waste debris and impurities from entering and interfering with the inner hole tensioning and positioning effect.

[0022] Specifically, the upper clamping seat 5 in this embodiment includes a small cylindrical section 5a, a conical diffuser section 5b, and a large cylindrical section 5c connected sequentially from top to bottom. A connecting edge 9 extends from the outer periphery of the upper end of the small cylindrical section 5a, and a connecting hole is provided on the connecting edge 9. The upper clamping seat 5 adopts a hollow structure that is smaller at the top and larger at the bottom, which can prevent it from bending the thin-plate limiting gear workpiece due to excessive weight, while ensuring stability during clamping. The inner diameter of the small cylindrical section 5a is smaller than the outer diameter of the expansion sleeve 3, and the extension of the small cylindrical section 5a above the expansion sleeve 3 forms a relatively long protective section, providing good protection.

[0023] In this embodiment, the lower support base 4 has an external cylindrical shape, and its internal hollow cavity is stepped, with the inner diameter decreasing from top to bottom. It includes a large-diameter section 4a and a small-diameter section 4b, achieving a wall thickness that increases from top to bottom. This ensures sufficient support and positioning for the workpiece 8 while preventing excessively large positioning surfaces from interfering with the inner hole's expansion. The thickened bottom design also ensures structural robustness. The inner and outer diameters of the large-diameter section 4a of the lower support base's hollow cavity are equal to the inner and outer diameters of the large cylindrical section 5c, ensuring consistent vertical positioning of the workpiece 8.

[0024] During use, the workpiece 8 is inserted from the top onto the stepped surface of the clamping body 1, with the lower end face of the workpiece 8 abutting against the upper end face of the support base 4. Then, the upper clamping base 5 is pressed against the upper end face of the workpiece 8, and the limiting post is aligned with the through hole and limiting groove 7 on the workpiece 8 to achieve clamping and fixing. Afterward, the expansion sleeve 3 at the inner hole of the workpiece 8 is pulled by the pull rod 2 to tighten the inner hole of the workpiece 8 to achieve positioning.

[0025] The specific embodiments described herein are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this invention are still covered by the claims of this invention.

Claims

1. A limit gear expansion sleeve clamp, comprising a clamp body, a pull rod, and an expansion sleeve, wherein the expansion sleeve is fixedly connected to the pull rod, the upper end of the clamp body forms a conical head, and the expansion sleeve is sleeved on the outside of the conical head and the two are engaged by the conical surface, characterized in that: The limiting gear expansion sleeve clamp also includes a lower support seat for abutting against the lower end face of the workpiece and an upper pressing seat for pressing against the upper end face of the workpiece, both of which are hollow. The clamping body has a stepped surface below the conical head, and the lower support seat is sleeved on the stepped surface and abuts against it, and the two are detachably connected; the upper end face of the lower support seat also has a plurality of limiting posts protruding, and the lower end face of the upper clamping seat has a plurality of limiting grooves correspondingly recessed, the limiting posts penetrate the workpiece and are inserted into the limiting grooves; the expansion sleeve is located in the cavity enclosed by the upper clamping seat and the lower support seat, and the upper end of the expansion sleeve does not protrude from the upper clamping seat.

2. The limiting gear expansion sleeve clamp according to claim 1, characterized in that: The upper pressing seat includes a small cylindrical section, a conical diffusion section, and a large cylindrical section connected in sequence from top to bottom.

3. The limiting gear expansion sleeve clamp according to claim 2, characterized in that: The inner diameter of the small cylindrical section is smaller than the outer diameter of the expansion sleeve.

4. The limiting gear expansion sleeve clamp according to claim 2, characterized in that: The upper outer periphery of the small cylindrical section has a connecting edge, and the connecting edge is provided with a connecting hole.

5. The limiting gear expansion sleeve clamp according to claim 2, characterized in that: The lower support base has a cylindrical outer shape, and its internal hollow cavity has a stepped shape with the inner diameter decreasing from top to bottom, including a large diameter section and a small diameter section.

6. The limiting gear expansion sleeve clamp according to claim 5, characterized in that: The inner and outer diameters of the large-diameter section of the hollow cavity of the lower support are equal to the inner and outer diameters of the large cylindrical section, respectively.

7. The limiting gear expansion sleeve clamp according to claim 1, characterized in that: The central axes of the lower support, upper clamping seat, expansion sleeve, and tie rod coincide with each other.

8. The limiting gear expansion sleeve clamp according to claim 1, characterized in that: The limiting columns are evenly distributed around the center of the lower support seat.

9. The limiting gear expansion sleeve clamp according to claim 1, characterized in that: The limiting post and the limiting groove are locked together.

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