Worm gear machining tensioning device

Abstract

A mandrel comprises a mandrel body and a limiting block arranged on the mandrel body, the peripheral wall of the mandrel body is sleeved with a pressing piece and an expansion assembly used for being inserted into an inner hole of a worm gear, the expansion assembly is located between the limiting block and the pressing piece, the pressing piece is movably matched with the mandrel body in the axial direction, and the limiting block is arranged on the mandrel body. And the expansion assembly is extruded to expand in the radial direction when the pressing piece moves in the direction close to the limiting block, and the expansion assembly shrinks in the radial direction when the pressing piece moves in the direction away from the limiting block. During use, the worm gear is arranged on the peripheral wall of the expansion assembly in a sleeving mode, the pressing piece moves towards the limiting block, the diameter of the expansion assembly is gradually increased under extrusion of the pressing piece and the limiting block, the expansion assembly expands an inner hole of the worm gear, a gap between the expansion assembly and the inner hole is counteracted, and radial run-out of the worm gear is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of worm gear processing equipment, in particular to a worm gear processing tensioning device. Background Art

[0002] In the prior art, worm gear processing is usually carried out by pressing the worm gear with a core shaft. This method has extremely high requirements on the diameter size of the core shaft and the aperture of the worm gear. If there is a gap between the core shaft and the aperture of the worm gear, it will be directly reflected in the tooth surface runout of the worm gear, which will in turn affect the smooth operation of the electric power steering device during operation. Utility Model Content

[0003] In view of the above problems, the utility model provides a worm gear processing tensioning device to overcome at least one disadvantage.

[0004] The technical solution adopted by the utility model is as follows: a worm gear processing tensioning device, comprising a core shaft, the core shaft comprising a shaft body and a limit block arranged on the shaft body, the outer peripheral wall of the shaft body is sleeved with a clamping piece and an expansion component for being inserted into the inner hole of the worm gear, the expansion component is located between the limit block and the clamping piece, the clamping piece is axially movable with the shaft body, so that when the clamping piece moves toward the direction approaching the limit block, the expansion component is squeezed and expanded in the radial direction, and when the clamping piece moves toward the direction away from the limit block, the expansion component contracts in the radial direction.

[0005] Optionally, the expansion assembly includes an expansion cone and a plurality of expansion blocks spaced circumferentially along the expansion cone, the expansion cone is sleeved on the outer peripheral wall of the shaft body, the expansion cone has a first end and a second end, the diameter of the expansion cone gradually increases from the first end to the second end, the clamping piece is movably abutted against the second end, and the expansion block is taperedly matched with the expansion cone.

[0006] Optionally, the expansion assembly further includes an elastic ring, which is sequentially wound around the outer surfaces of the plurality of expansion blocks.

[0007] Optionally, the expansion block is provided with a groove matching with the elastic ring, and the diameter of the elastic ring is smaller than the height of the groove.

[0008] Optionally, the outer peripheral wall of the shaft body is provided with an external thread, and the clamping piece is provided with an internal thread matching the external thread.

[0009] Optionally, the shaft body includes a smooth section and a threaded section coaxially connected to the smooth section, the threaded section is provided with the external thread, and the expansion assembly is sleeved on the outer peripheral wall of the smooth section.

[0010] Optionally, the length of the expansion block is the same as the length of the expansion cone, and the length of the smooth section is less than or equal to the length of the expansion cone.

[0011] Optionally, the shaft body and the limiting block are an integrally formed structure.

[0012] The beneficial effect of the utility model is that when in use, the worm wheel is sleeved on the outer peripheral wall of the expansion component, and the pressing piece is moved toward the direction of the limit block. The expansion component is squeezed by the pressing piece and the limit block so that the diameter of the expansion component gradually increases, so that the expansion component tightens the inner hole of the worm wheel, offsetting the gap between the expansion component and the inner hole, greatly improving the stability of the processing process, effectively reducing the radial runout of the worm wheel, making the electric power steering device run more smoothly during operation, and thus improving the performance of the electric power steering device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of a worm gear processing tensioning device proposed in an embodiment of the utility model;

[0014] Figure 2 for Figure 1 A is an enlarged view of the middle image.

[0015] The markings in the accompanying drawings are: 1, shaft body; 2, limit block; 3, clamping piece; 4, expansion cone; 5, expansion block; 6, elastic ring; 7, groove; 8, worm gear; 9, smooth section; 10, threaded section. DETAILED DESCRIPTION

[0016] The utility model is described in detail below in conjunction with the accompanying drawings.

[0017] like Figure 1 As shown, a worm gear processing tensioning device comprises a mandrel, the mandrel comprises a shaft body 1 and a stop block 2 arranged on the shaft body 1, the outer peripheral wall of the shaft body 1 is sleeved with a clamping member 3 and an expansion assembly for inserting into the inner hole of the worm gear 8, the expansion assembly is located between the stop block 2 and the clamping member 3, the clamping member and the shaft body 1 are axially movable, so that when the clamping member moves toward the direction close to the stop block 2, the expansion assembly is squeezed and expands in the radial direction, and when the clamping member moves toward the direction away from the stop block 2, the expansion assembly shrinks in the radial direction. When in use, the worm gear 8 is sleeved on the outer peripheral wall of the expansion assembly, and the clamping member 3 is moved toward the stop block 2. Under the squeezing of the clamping member 3 and the stop block 2, the diameter of the expansion assembly gradually increases, so that the expansion assembly tightens the inner hole of the worm gear 8, offsets the gap between the expansion assembly and the inner hole, greatly improves the stability of the processing process, effectively reduces the radial runout of the worm gear 8, makes the electric power steering device run more smoothly during operation, and thus improves the performance of the electric power steering device.

[0018] In this embodiment, if Figure 1As shown, the expansion assembly includes an expansion cone 4 and a plurality of expansion blocks 5 circumferentially spaced along the expansion cone 4. The expansion cone 4 is sleeved on the outer peripheral wall of the shaft body 1. The expansion cone 4 has a first end and a second end. The diameter of the expansion cone 4 gradually increases from the first end to the second end. The clamping member 3 movably abuts against the second end, and the expansion block 5 is tapered with the expansion cone 4. The clamping member 3 abuts against the expansion cone 4 to move the expansion cone 4 toward the limit block 2. The expansion block 5 abuts against the limit block 2. During the tapered cooperation between the expansion block 5 and the expansion cone 4, the overlapping height of the expansion block 5 and the expansion cone 4 gradually increases, offsetting the gap between the expansion block 5 and the inner hole.

[0019] In this embodiment, if Figure 1 As shown, the expansion assembly further includes an elastic ring 6, which is sequentially wound around the outer surfaces of the plurality of expansion blocks 5. When the pressing member 3 pushes the expansion cone 4 to move toward the stop block 2, the overlapping height of the expansion block 5 and the expansion cone 4 gradually increases, and the elastic ring 6 is stretched by force. When the worm gear 8 is processed, the pressing member 3 moves away from the stop block 2, and the plurality of expansion blocks 5 approach each other under the action of the restoring force of the elastic ring 6, and the expansion cone 4 is squeezed out in the direction away from the expansion block 5, so as to facilitate the removal of the worm gear 8.

[0020] In this embodiment, if Figure 2 As shown, the expansion block 5 is provided with a groove 7 that cooperates with the elastic ring 6, and the diameter of the elastic ring 6 is smaller than the height of the groove 7. It is prevented that the elastic ring 6 protrudes out of the groove 7 and affects the cooperation between the worm wheel 8 and the expansion block 5.

[0021] In this embodiment, if Figure 1 As shown, the outer peripheral wall of the shaft body 1 is provided with an external thread, and the clamping member 3 is provided with an internal thread matching the external thread. The clamping member 3 is rotatably connected to the shaft body 1 through the thread, so that the clamping member 3 can be screwed in or out along the shaft body 1.

[0022] In this embodiment, if Figure 1 As shown, the shaft body 1 includes a smooth section 9 and a threaded section coaxially connected to the smooth section 9, the threaded section is provided with the external thread, and the expansion assembly is sleeved on the outer peripheral wall of the smooth section 9.

[0023] In this embodiment, if Figure 1 As shown, the length of the expansion block 5 is the same as that of the expansion cone 4, and the length of the smooth section 9 is less than or equal to the length of the expansion cone 4. It is ensured that the pressing member 3 pushes the expansion cone 4 until the expansion block 5 expands to the maximum extent, and the setting of the smooth section 9 reduces the friction between the expansion cone 4 and the shaft body 1.

[0024] In this embodiment, if Figure 1 As shown, the shaft body 1 and the limiting block 2 are an integrally formed structure.

[0025] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A worm gear processing tensioning device, comprising a mandrel, characterized in that: The core shaft includes a shaft body and a limit block arranged on the shaft body, a clamping piece and an expansion component for being inserted into the inner hole of the worm gear are sleeved on the outer peripheral wall of the shaft body, the expansion component is located between the limit block and the clamping piece, and the clamping piece is axially movable with the shaft body so that when the clamping piece moves toward the limit block, the expansion component is squeezed and expanded in the radial direction, and when the clamping piece moves toward the direction away from the limit block, the expansion component contracts in the radial direction.

2. The worm gear processing tensioning device according to claim 1, characterized in that: The expansion assembly includes an expansion cone and a plurality of expansion blocks spaced apart circumferentially along the expansion cone. The expansion cone is sleeved on the outer peripheral wall of the shaft body. The expansion cone has a first end and a second end. The diameter of the expansion cone gradually increases from the first end to the second end. The clamping piece movably abuts against the second end, and the expansion block is taperedly matched with the expansion cone.

3. The worm gear processing tensioning device according to claim 2, characterized in that: The expansion assembly also includes an elastic ring, which is sequentially wound around the outer surfaces of the plurality of expansion blocks.

4. The worm gear processing tensioning device according to claim 3, characterized in that: The expansion block is provided with a groove matched with the elastic ring, and the diameter of the elastic ring is smaller than the height of the groove.

5. The worm gear processing tensioning device according to claim 2, characterized in that: The outer peripheral wall of the shaft body is provided with an external thread, and the pressing piece is provided with an internal thread matching the external thread.

6. The worm gear processing tensioning device according to claim 5, characterized in that: The shaft body comprises a smooth section and a threaded section coaxially connected to the smooth section, the threaded section is provided with the external thread, and the expansion assembly is sleeved on the outer peripheral wall of the smooth section.

7. The worm gear processing tensioning device according to claim 6, characterized in that: The length of the expansion block is the same as the length of the expansion cone, and the length of the smooth section is less than or equal to the length of the expansion cone.

8. The worm gear processing tensioning device according to claim 1, characterized in that: The shaft body and the limiting block are an integrally formed structure.

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