Limiting gear expansion sleeve clamp

Abstract

The utility model discloses a limit gear expansion sleeve clamp which comprises a clamp body, a pull rod and an expansion sleeve, the expansion sleeve is fixedly connected with the pull rod, a conical head is formed at the upper end of the clamp body, and the expansion sleeve is sleeved outside the conical head and matched with the conical head through a conical surface. The limiting gear expansion sleeve clamp is characterized in that the limiting gear expansion sleeve clamp further comprises a lower supporting base used for abutting against and supporting the lower end face of a workpiece and an upper pressing base used for abutting against and pressing the upper end face of the workpiece, and the upper pressing base and the lower supporting base are both hollow; the clamp body is provided with a step surface below the conical head, and the lower supporting seat is sleeved on the step surface, abuts against the step surface and is detachably connected with the step surface. A plurality of limiting columns are further arranged on the upper end face of the lower supporting base in a protruding mode, a plurality of limiting grooves are correspondingly formed in the lower end face of the upper pressing base in a concave mode, and the limiting columns penetrate through the workpiece and are inserted into the limiting grooves. The expansion sleeve is located in a cavity defined by the upper pressing base and the lower supporting base, and the upper end of the expansion sleeve is not exposed out of the upper pressing base. According to the structure, clamping and positioning are more stable, a good protection effect can be achieved, and sweeps are effectively prevented from entering.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear part processing technical field especially relates to a limit gear expansion sleeve clamp. BACKGROUND

[0002] The limit gear assembly is an important component of the automobile timing system, plays a time scale positioning role in completing related control functions in the mechanical device, is the key to whether the timing ignition is accurate, and the performance directly influences the driving quality of the automobile.

[0003] The traditional gear processing clamp is mainly of expansion sleeve structure, including a clamp body, a pull rod and an expansion sleeve, the expansion sleeve is fixedly connected with the pull rod, a tapered head is formed at the upper end of the clamp body, the expansion sleeve is sleeved outside the tapered head and the two are matched through the taper surface, and the expansion sleeve is expanded to the gear inner hole. Due to the particularity of the structure of the limit gear sheet, the traditional gear processing clamp is prone to unstable positioning, easy bending and deformation during the processing of the external gear, high processing difficulty, and no protection during the processing process. UTILITY MODEL CONTENTS

[0004] The utility model provides a limit gear expansion sleeve clamp, which has good clamping positioning and protection effect and prevents debris from entering the clamp body.

[0005] The technical scheme of the utility model is as follows:

[0006] The limit gear expansion sleeve clamp comprises a clamp body, a pull rod and an expansion sleeve, the expansion sleeve is fixedly connected with the pull rod, a tapered head is formed at the upper end of the clamp body, the expansion sleeve is sleeved outside the tapered head and the two are matched through the taper surface, characterized in that: the limit gear expansion sleeve clamp further comprises a lower support seat for abutting and supporting the lower end surface of the workpiece and an upper pressing seat for pressing the upper end surface of the workpiece, and the upper pressing seat and the lower support seat are both hollow.

[0007] The clamp body is provided with a stepped surface below the tapered head, the lower support seat is sleeved on the stepped surface and detachably connected thereon, a plurality of limiting columns are protruded on the upper end surface of the lower support seat, a plurality of limiting grooves are recessed on the lower end surface of the upper pressing seat, the limiting columns penetrate the workpiece and are inserted into the limiting grooves, and the expansion sleeve is located in the cavity enclosed by the upper pressing seat and the lower support seat and the upper end of the expansion sleeve does not expose the upper pressing seat.

[0008] In the above structure, the expansion sleeve clamp not only expands and positions the inner hole of the limit gear workpiece, but also abuts and positions the upper and lower end faces of the workpiece through the lower support seat and the upper pressing seat, and further limits through the insertion and cooperation of the limit column and the workpiece and the limit groove to prevent the three from rotating circumferentially; the clamping stability is higher; meanwhile, the upper pressing seat and the lower support seat form a protective cover structure that hides the expansion sleeve therein, which can effectively prevent the debris of external gear machining from entering the expansion sleeve, and enhance the protection effect.

[0009] Further, in the limit gear expansion sleeve clamp, the upper pressing seat comprises small cylinder segments, conical diffusion segments and large cylinder segments connected in sequence from top to bottom.

[0010] Further, in the limit gear expansion sleeve clamp, the inner diameter of the small cylinder segment is smaller than the outer diameter of the expansion sleeve, and the small cylinder segment is located above the expansion sleeve to form a long protection segment above the expansion sleeve.

[0011] Further, in the limit gear expansion sleeve clamp, an extension connection is arranged on the outer periphery of the upper end of the small cylinder segment, and a connection hole is arranged on the extension connection.

[0012] Further, in the limit gear expansion sleeve clamp, the lower support seat is in a cylindrical shape, and the hollow cavity in the lower support seat is in a stepped shape with a smaller inner diameter from top to bottom, comprising a large diameter segment and a small diameter segment.

[0013] Further, in the limit gear expansion sleeve clamp, the inner and outer diameters of the large diameter segment of the hollow cavity of the lower support seat are equal to the inner and outer diameters of the large cylinder segment, so that the action positions of the lower support seat and the upper pressing seat on the workpiece are consistent and balanced, and the unilateral overpressure does not cause the side bending deformation of the limit gear workpiece.

[0014] Further, in the limit gear expansion sleeve clamp, the central axes of the lower support seat, the upper pressing seat, the expansion sleeve and the pull rod coincide with each other.

[0015] Further, in the limit gear expansion sleeve clamp, the limit columns are uniformly distributed around the center of the lower support seat.

[0016] Further, the limiting gear expansion sleeve clamp, the clamping cooperation is arranged between the limiting column and the limiting groove, the workpiece, the lower support base and the upper pressing base are connected and positioned stably.

[0017] The utility model discloses the beneficial effect is:

[0018] The utility model discloses provide the inner hole expansion sleeve positioning function basis, utilize lower support base and upper pressing base and provide end face abutting positioning effect for workpiece upper and lower end face, and design limiting post, limiting groove structure on lower support base and upper pressing base, realize the insertion positioning of workpiece, guarantee lower support base, workpiece, upper pressing base three installation position accuracy, improve clamping positioning precision, guarantee installation stability.

[0019] The utility model discloses still can utilize upper pressing base and lower support base and form the outer protective structure of the set in the expansion sleeve outside together, prevent various waste scraps and impurities formed by external tooth processing from entering the expansion sleeve, need not clean the fixture frequently, prolong the life. DRAWINGS

[0020] Figure 1 It is the sectional view schematic drawing of the utility model.

[0021] Figure 2 It is Figure 1 The circle place partial close -up. CONCRETE IMPLEMENTING METHOD

[0022] The utility model makes further explanation to the utility model with the drawings:

[0023] Refer to Figure 1 , Figure 2 As shown, the utility model discloses a limiting gear expansion sleeve clamp, including the body of a clamp 1, pull rod 2, expansion sleeve 3, expansion sleeve 3 with pull rod 2 fixed connection, the body of a taper head is formed on the upper end of clamp 1, and expansion sleeve 3 is set in the taper head outside and both pass through taper surface cooperation. The limiting gear expansion sleeve clamp still includes the lower support base 4 for abutting support in the lower end surface of workpiece 8 and the upper pressing base 5 for pressing in the upper end surface of workpiece 8, and the upper pressing base 5 and lower support base 4 are all hollow. The central axis of lower support base 4, upper pressing base 5, expansion sleeve 3 and pull rod 2 coincides with each other.

[0024] The body of a clamp 1 is equipped with the step surface at the position below taper head, and lower support base 4 is set on the step surface and abuts and detachable connection between both;The lower support base 4 upper end surface still protrudes with a plurality of limiting posts 6, and the limiting post 6 surrounds the even distribution of lower support base 4 center. The upper pressing base 5 lower end surface corresponds and recessed with a plurality of limiting grooves 7, the limiting post 6 passes through workpiece 8 and inserts into limiting groove 7, and the clamping cooperation between limiting post 6 and limiting groove 7.

[0025] The expansion sleeve 3 is located in the cavity surrounded by the upper pressing seat 5 and the lower supporting seat 4, and the upper end of the expansion sleeve 3 does not expose the upper pressing seat 5. Through the surrounding protection of the upper pressing seat 5 and the lower supporting seat 4, the components such as the expansion sleeve 3 are effectively protected, and the waste and impurities are prevented from entering to interfere with the positioning effect of the inner hole expansion.

[0026] Specifically, the upper pressing seat 5 includes a small cylinder segment 5a, a conical diffusion segment 5b and a large cylinder segment 5c connected in sequence from top to bottom, and a connecting edge 9 extends outward from the upper end of the small cylinder segment 5a, and a connecting hole is arranged on the connecting edge 9. The upper pressing seat 5 adopts a hollow structure with small top and large bottom, which can not only avoid excessive bending of the thin piece limiting gear workpiece, but also ensure the stability during pressing.

[0027] The lower supporting seat 4 is cylindrical in shape, and the hollow cavity in the inside is ladder-shaped with a smaller inner diameter from top to bottom, including a large diameter segment 4a and a small diameter segment 4b, so that the wall thickness of the lower supporting seat 4 increases from top to bottom, which can not only ensure sufficient supporting and positioning effect on the workpiece 8, but also avoid interference with the inner hole expansion, and the thickened bottom design can ensure the structural firmness. The inner and outer diameters of the large diameter segment 4a of the hollow cavity of the lower supporting seat are equal to the inner and outer diameters of the large cylinder segment 5c, respectively, so as to ensure the consistency of the upper and lower positioning effects on the workpiece 8.

[0028] In the use process, the workpiece 8 is sleeved on the stepped surface of the clamping body 1 from the top, the lower end surface of the workpiece 8 abuts against the upper end surface of the supporting seat 4, and then the upper pressing seat 5 is pressed on the upper end surface of the workpiece 8, and the limiting column is aligned with the through hole on the workpiece 8 and the limiting groove 7 to realize clamping and fixing; then the expansion sleeve 3 at the inner hole of the workpiece 8 is pulled by the pull rod 2 to expand the inner hole of the workpiece 8 to realize positioning.

[0029] The specific embodiments described in the present application are only illustrative of the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application are still covered by the claims of the present application.

Claims

1. A limit gear expansion sleeve clamp, comprising a clamp body, a pull rod, and an expansion sleeve, the expansion sleeve being fixedly connected with the pull rod, a tapered head being formed on the upper end of the clamp body, the expansion sleeve being sleeved outside the tapered head and the two being matched through a tapered surface, characterized in that: The limiting gear expansion sleeve clamp further comprises a lower support seat for abutting against the lower end surface of the workpiece and an upper pressing seat for pressing against the upper end surface of the workpiece, and the upper pressing seat and the lower support seat are both hollow; The clamp body is provided with a stepped surface at a position below the conical head, the lower support seat is sleeved on the stepped surface and detachably connected therewith, the upper end surface of the lower support seat is further provided with a plurality of limiting columns, the lower end surface of the upper pressing seat is correspondingly provided with a plurality of limiting grooves, the limiting columns penetrate 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 support seat and the upper end of the expansion sleeve does not protrude from the upper pressing seat.

2. The limit gear expansion collet of claim 1, wherein: The upper pressing seat comprises a small cylinder segment, a conical diffusion segment and a large cylinder segment connected in sequence from top to bottom.

3. The limit gear expansion collet of claim 2, wherein: The inner diameter of the small cylinder segment is smaller than the outer diameter of the expansion sleeve.

4. The limit gear expansion collet clamp of claim 2, wherein: The small cylinder segment is provided with a connecting flange extending outward from the upper end, and the connecting flange is provided with a connecting hole.

5. The limit gear expansion collet clamp of claim 2, wherein: The lower support seat is cylindrical in shape, and the hollow cavity in the interior thereof is stepped in shape with a decreasing inner diameter from top to bottom, comprising a large diameter segment and a small diameter segment.

6. The limit gear expansion collet clamp of claim 5, wherein: The inner and outer diameters of the large diameter segment of the hollow cavity of the lower support seat are equal to the inner and outer diameters of the large cylinder segment, respectively.

7. The limit gear expansion collet clamp of claim 1, wherein: The central axes of the lower support seat, the upper pressing seat, the expansion sleeve and the pull rod coincide with each other.

8. The limit gear expansion collet of claim 1, wherein: The limiting columns are uniformly distributed around the center of the lower support seat.

9. The limit gear expansion collet clamp of claim 1, wherein: The limiting columns and the limiting grooves are clamped and matched.

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