Center turning fixture

Abstract

The present invention discloses a center sleeve machining fixture, comprising a connecting disk, an annular retaining frame and an annular clamping body, wherein the annular retaining frame is arranged on the connecting disk, and the annular retaining frame is rotatably matched with the connecting disk; a clamping round bar used for clamping in a tooth groove on the center sleeve is arranged on the retaining frame, and the clamping round bar can slide in the radial direction of the retaining frame; the annular clamping body is fixed on the connecting disk, and the inner hole of the annular clamping body has a spiral surface corresponding to the clamping round bar one by one, and the spiral surface is used to push the clamping round bar to move radially along the annular retaining frame. The center sleeve machining fixture of the present invention clamps and fixes the center sleeve by the clamping round bar matched with the tooth groove, so that the pitch circle of the gear ring of the center sleeve and the spline hole are mutually referenced in the two processes of machining and testing, thereby avoiding the technical problem in the prior art that the outer cylindrical surface of the center sleeve gear ring is used as the clamping and positioning reference for turning the spline hole, which will cause a large error in the pitch circle runout of the spline sleeve gear ring.

Description

Technical Field

[0001] The invention relates to the technical field of clutches, in particular to a center sleeve lathe processing fixture. Background Art

[0002] The center sleeve is a major component in a motorcycle wet clutch, with a spline hole in the center connected to the main shaft of the engine transmission, and a gear ring that matches the driven steel plate is arranged on its outer cylindrical surface. In the prior art, when turning the spline hole of the center sleeve, the outer cylindrical surface of the center sleeve gear ring is used as the clamping and positioning reference, and the lathe clamp clamps the outer cylindrical surface of the center sleeve gear ring and then turns the spline hole. However, in the center sleeve detection stage, it is necessary to use the spline hole as a reference to detect the center sleeve gear ring pitch circle runout. Since the center sleeve gear ring pitch circle is used as the positioning reference when turning the spline inner hole, a large error will occur when the center sleeve gear ring pitch circle runout is detected based on the spline hole, and even the product quality is unqualified. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a center sleeve turning fixture to solve the technical problem in the prior art that using the outer cylindrical surface of the center sleeve gear ring as the clamping and positioning reference for turning the spline hole will cause large spline sleeve gear ring pitch circle runout error.

[0004] The center sleeve lathe processing fixture of the present invention comprises a connecting plate, an annular retaining frame and an annular clamp body.

[0005] The annular retainer is arranged on the connecting disk, and the annular retainer is rotatably matched with the connecting disk;

[0006] The retaining frame is provided with at least two clamping round rods for clamping in the tooth grooves on the center sleeve, the clamping round rods are evenly arranged along the circumference of the retaining frame, and the clamping round rods can slide in the radial direction of the retaining frame;

[0007] The annular clamp body is fixed on the connecting plate, and the inner hole of the annular clamp body has a spiral surface corresponding to the clamping round rod. The orthographic projection of the spiral surface on a plane perpendicular to the axial center line of the annular clamp body is a plane spiral line. The spiral surface is used to push the clamping round rod to move radially along the annular retainer.

[0008] Furthermore, the contact portion between the clamping round rod and the tooth surface on the center sleeve is located on the pitch circle of the gear ring.

[0009] Furthermore, the annular retainer is provided with waist-shaped holes corresponding to the clamped round rods one by one, the length direction of the waist-shaped holes is consistent with the radial direction of the annular retainer, and the depth direction of the waist-shaped holes is parallel to the axial direction of the annular retainer;

[0010] One end of the clamping round rod is inserted into the waist-shaped hole and slidably matched with the waist-shaped hole, and the end of the clamping round rod is provided with a stop flange to prevent it from withdrawing from the waist-shaped hole;

[0011] The annular retainer is also provided with a blind hole whose hole depth direction is consistent with the radial direction of the annular retainer, and a spring whose end portion presses against the clamping round rod is provided in the blind hole.

[0012] Furthermore, a shallow avoidance groove for avoiding the clamping of the round rod is arranged on the inner hole surface of the annular clamp, and the shallow avoidance groove is arranged at the end of the spiral surface.

[0013] Beneficial effects of the present invention:

[0014] 1. When turning the inner hole of the center sleeve spline, the center sleeve turning fixture of the present invention clamps and fixes the center sleeve by clamping the round rod matched with the tooth groove, so that the pitch circle of the center sleeve gear ring and the spline hole serve as references to each other in the two processes of processing and testing, thereby avoiding the technical problem of large runout error of the spline sleeve gear ring pitch circle caused by using the outer cylindrical surface of the center sleeve gear ring as the clamping and positioning reference for turning the spline hole in the prior art.

[0015] 2. The center sleeve lathe processing fixture of the present invention pushes the center sleeve of the round rod clamp through the spiral surface that is projected as a plane spiral line. When the center sleeve rotates forward, the workpiece is clamped and fixed, and when the center sleeve rotates reversely, the workpiece is prevented from loosening. The workpiece is easy and fast to load and unload, and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural diagram of the center sleeve;

[0017] Figure 2 This is a schematic diagram of the structure of the center turning fixture;

[0018] Figure 3 The schematic diagram of the structure of the center sleeve on the fixture;

[0019] Figure 4 It is a schematic diagram of the specific cross-sectional structure of the ring clamp;

[0020] Figure 5 is a schematic diagram of the structure of the annular cage;

[0021] Figure 6 It is a schematic diagram of the specific structure of the ring clamp. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] As shown in the figure, the center sleeve lathe processing fixture in this embodiment includes a connecting plate 1. In this embodiment, the connecting plate is provided with bolt connection holes so as to connect it to the main shaft of the lathe.

[0024] The center sleeve turning fixture in this embodiment further includes an annular retaining frame 2 and an annular clamp body 3 .

[0025] The annular retainer is arranged on the connecting disk, and the annular retainer is rotatably matched with the connecting disk. Specifically, in this embodiment, an annular groove 4 for mounting and positioning the annular retainer is arranged on the connecting disk, and the inner hole of the annular retainer has an arc-shaped positioning surface 5 that is rotatably matched with the inner cylindrical groove wall of the annular groove. Of course, in different embodiments, the outer cylindrical groove wall of the annular groove and the annular retainer can also be matched to perform rotation center positioning, and other structural forms can be used to achieve rotational matching between the annular retainer and the connecting disk.

[0026] The retainer is provided with at least two clamping round rods 6 for clamping in the tooth grooves on the center sleeve, the clamping round rods are evenly arranged along the circumference of the retainer, and the clamping round rods can slide in the radial direction of the retainer. In this embodiment, the number of the clamping round rods is three, and in a specific implementation, the number of the clamping round rods is preferably three or four.

[0027] The annular clamp body is fixed on the connecting disk, and the inner hole of the annular clamp body has a spiral surface 7 corresponding to the clamping round rod. The orthographic projection of the spiral surface on the plane perpendicular to the axial center line of the annular clamp body is a plane spiral line. In this embodiment, the plane spiral line is specifically rotated into an Archimedean spiral line. The spiral surface is used to push the clamping round rod to move radially along the annular retaining frame.

[0028] When turning the inner hole of the center sleeve spline, the center sleeve is placed on the clamping rod, and the clamping rod is located in the tooth groove on the center sleeve gear ring. Then the center sleeve is rotated. When rotating, the center sleeve drives the clamping rod and the annular retainer to rotate. During the rotation, the clamping rod 6 moves along the spiral surface 7 on the annular clamp body, and the spiral surface gradually pushes the clamping rod 6 inward, so that the clamping rod clamps the center sleeve. After the turning process is completed, the center sleeve is rotated in the opposite direction, and the clamping rod releases the center sleeve, and the center sleeve can be removed from the clamp. The loading and unloading operation is simple and convenient.

[0029] Since the center sleeve turning fixture clamps and fixes the center sleeve by means of a clamping round bar that cooperates with the tooth groove, the pitch circle of the center sleeve gear ring and the spline hole serve as references to each other in the two processes of processing and testing, thereby avoiding the technical problem in the prior art of using the outer cylindrical surface of the center sleeve gear ring as the clamping and positioning reference for turning the spline hole, which will cause a large runout error of the pitch circle of the spline sleeve gear ring.

[0030] As an improvement to the above embodiment, the contact portion between the clamping round rod and the tooth surface on the center sleeve is on the gear ring pitch circle, which can better ensure that the gear ring pitch circle and the spline hole of the center sleeve are mutually referenced in the two processes of processing and testing, thereby improving the dimensional accuracy of the center sleeve product.

[0031] As an improvement to the above embodiment, the annular retainer is provided with waist-shaped holes 8 corresponding to the clamping round rods, the length direction of the waist-shaped holes is consistent with the radial direction of the annular retainer, and the depth direction of the waist-shaped holes is parallel to the axial direction of the annular retainer.

[0032] One end of the clamping round rod is inserted into the waist-shaped hole and slidably matched with the waist-shaped hole, and the end of the clamping round rod is provided with a stop flange 61 to prevent it from withdrawing from the waist-shaped hole.

[0033] The annular retainer is also provided with a blind hole 9 whose hole depth direction is consistent with the radial direction of the annular retainer, and a spring 10 whose end is pressed against the clamping round rod is provided in the blind hole.

[0034] In the improved structure, when the center sleeve is rotated forward, the clamping round rod can be pushed by the spiral surface and can flexibly move along the length direction of the waist-shaped hole; when the center sleeve is rotated backward, the clamping round rod can quickly release the center sleeve under the action of the spring thrust. And when there is no workpiece installed, the clamping round rod is stably located at the outer end of the waist-shaped hole under the action of the spring thrust, so that when the center sleeve is installed, the center sleeve can be conveniently inserted on the clamping round rod.

[0035] As an improvement to the above embodiment, the inner hole surface of the ring clamp is provided with a shallow avoidance groove 11 for avoiding the clamping round rod, and the shallow avoidance groove is provided at the end of the spiral surface. In the specific implementation, the depth of the shallow avoidance groove is occasionally selected to be 1.5-2.5mm. By providing the shallow avoidance groove, when the center sleeve is installed, the clamping round rod can be offset to the shallow avoidance groove, which is more conducive to the installation of the center sleeve and can shorten the clamping time; at the same time, due to the shallow depth of the shallow avoidance groove, the clamping round rod can easily withdraw from the shallow avoidance groove and transfer to the spiral surface when the center sleeve is rotated.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A center sleeve lathe processing fixture, including a connecting plate, characterized in that: Also includes a ring retainer and a ring clamp body, The annular retainer is arranged on the connecting disk, and the annular retainer is rotatably matched with the connecting disk; The retaining frame is provided with at least two clamping round rods for clamping in the tooth grooves on the center sleeve, the clamping round rods are evenly arranged along the circumference of the retaining frame, and the clamping round rods can slide in the radial direction of the retaining frame; The annular clamp body is fixed on the connecting plate, and the inner hole of the annular clamp body has a spiral surface corresponding to the clamping round rod one by one, and the orthographic projection of the spiral surface on the plane perpendicular to the axial center line of the annular clamp body is a plane spiral line, and the spiral surface is used to push the clamping round rod to move radially along the annular retainer; The annular retainer is provided with waist-shaped holes corresponding to the clamped round rods one by one, the length direction of the waist-shaped holes is consistent with the radial direction of the annular retainer, and the depth direction of the waist-shaped holes is parallel to the axial direction of the annular retainer; One end of the clamping round rod is inserted into the waist-shaped hole and slidably matched with the waist-shaped hole, and the end of the clamping round rod is provided with a stop flange to prevent it from withdrawing from the waist-shaped hole; The annular retainer is also provided with a blind hole whose hole depth direction is consistent with the radial direction of the annular retainer, and a spring whose end portion presses against the clamping round rod is provided in the blind hole.

2. The center sleeve machining fixture according to claim 1, characterized in that: The contact portion between the clamping round rod and the tooth surface on the center sleeve is located on the pitch circle of the gear ring.

3. The center sleeve lathe processing fixture according to claim 1 is characterized in that: The inner hole surface of the annular clamp is provided with a shallow avoidance groove for avoiding the clamping of the round rod, and the shallow avoidance groove is arranged at the end of the spiral surface.

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