Tooth manufacturing clamp for large-inner-hole spiral bevel gear

Abstract

The utility model discloses a tooth manufacturing clamp for a large-inner-hole spiral bevel gear. The tooth manufacturing clamp comprises a clamp body, a pull rod, a positioning tray and an elastic expansion piece. One end of the clamp body is connected with an equipment spindle; the positioning tray is connected to the clamp body; the pull rod is in sliding fit with the clamp body, the elastic expansion piece is located between the pull rod and the clamp body, the pull rod moves to extrude the elastic expansion piece, and the elastic expansion piece is stressed to deform and expand outwards so that the outer diameter can be increased. The whole clamp body is in a step shaft shape, one end of the clamp body connected with an equipment main shaft is in a cone shape, the other end of the clamp body is provided with two steps, and a center hole is formed in the center of the clamp body. Compared with the prior art, the inner hole of the spiral bevel gear can be tensioned by pulling the pull rod through the air cylinder or the oil cylinder, extruding the belleville spring through the pressing block on the pull rod and expanding the belleville spring outwards, time and labor are saved when the spiral bevel gear is disassembled and assembled, the machining efficiency is greatly improved, and tooth profile machining of large-inner-hole spiral bevel gears on a large scale can be met.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a fixture for making large-bore spiral bevel gears. Background Technology

[0002] Spiral bevel gears, also known as spiral conical gears, are commonly used for motion and power transmission between two intersecting shafts. The teeth of a spiral bevel gear are distributed across the surface of a cone, with the tooth profile gradually decreasing from the large end to the small end. These gears are relatively large and are often used in the rear-drive transmission systems of passenger cars and construction machinery, where power transmitted through the main drive shaft drives the rotation of the driven gear.

[0003] For conventional spiral bevel gears with an inner bore of φ150 or less, a fully expanded jig can be used. However, for spiral bevel gears with larger inner bores, the fully expanded jig cannot meet the requirements. In this case, a traditional jig with a dead mandrel and nut is used to fix the spiral bevel gear for gear milling, grinding, polishing, and rolling inspection.

[0004] However, when machining large quantities of tooth profiles, traditional fixtures require operators to constantly disassemble and reassemble nuts, which is quite time-consuming and labor-intensive, greatly reducing machining efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a gear-making fixture for spiral bevel gears with large inner bores. By pulling a lever with a cylinder or hydraulic cylinder, the pressure block on the lever compresses the disc spring, and the disc spring expands outward to tighten the inner bore of the spiral bevel gear. This saves time and effort when assembling and disassembling spiral bevel gears, greatly improving processing efficiency. It can meet the requirements for machining the tooth profile of large-volume spiral bevel gears with large inner bores, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A large-diameter spiral bevel gear making fixture includes a fixture body, a pull rod, a positioning tray, and an elastic expansion plate; one end of the fixture body is connected to the main shaft of the equipment, and the positioning tray is connected to the fixture body; the pull rod is slidably fitted to the fixture body, and the elastic expansion plate is located between the pull rod and the fixture body. The pull rod moves to compress the elastic expansion plate, and the elastic expansion plate deforms outward under force to increase the outer diameter.

[0008] A further improvement of this utility model is that the clamp body is in the shape of a stepped shaft, the end of the clamp body connected to the main shaft of the equipment is tapered, the other end of the clamp body is provided with two steps, and a central hole is provided at the center of the clamp body.

[0009] A further improvement of this utility model is that the inner hole of the positioning tray is clearance-fitted with the outer circular surface of the clamping body, and the positioning tray is connected to the secondary stepped surface of the clamping body by locking screws, and the outer side of the positioning tray is provided with several chip removal grooves.

[0010] A further improvement of this utility model is that the spindle section of the pull rod is slidably fitted into the center hole of the clamping body, and one end of the pull rod connected to the main shaft of the equipment is provided with an external thread, and the other end is provided with a pressure block.

[0011] A further improvement of this utility model is that one end of the clamp body is threaded with an anti-rotation screw, and one end of the pull rod is provided with a limiting hole, in which the anti-rotation screw is accommodated.

[0012] A further improvement of this utility model is that the outer circular surface of the mating part between the pull rod and the clamp is provided with several annular grooves.

[0013] A further improvement of this utility model is that the elastic expansion piece consists of two symmetrically arranged butterfly springs, with several wire-cut grooves arranged in a ring array on the butterfly springs. The cavity between the two butterfly springs and the inside of the wire-cut grooves are filled with polyurethane sealant, and the two butterfly springs are located between the first-level step surface of the clamping body and the end face of the pressure block.

[0014] A further improvement of this utility model is that an L-shaped anti-rotation positioning pin is connected to the positioning tray, and a limiting groove is provided on the disc spring, with the anti-rotation positioning pin being engaged in the limiting groove.

[0015] A further improvement of this utility model is that the outer surface of the disc spring is rounded.

[0016] A further improvement of this utility model is that a threaded through hole is provided on the secondary step surface of the clamping body, and a set screw is threadedly engaged in the threaded through hole.

[0017] The beneficial effects of this utility model are:

[0018] This utility model relates to a large-bore spiral bevel gear tooth-making fixture. By using a cylinder or hydraulic cylinder to pull a lever, the pressure block on the lever compresses a disc spring, causing the disc spring to expand outward and tighten the inner bore of the spiral bevel gear. This saves time and effort when assembling and disassembling spiral bevel gears, greatly improving processing efficiency and meeting the needs of large-volume large-bore spiral bevel gear tooth profile processing.

[0019] This utility model has a large inner bore spiral bevel gear making jig with several chip removal grooves on the outer side of the positioning tray to reduce the contact area with the parts and prevent the parts from being crushed during the machining process.

[0020] The large-bore spiral bevel gear tooth-making fixture of this utility model has several annular grooves on the outer circular surface of the mating part between the pull rod and the fixture body, which facilitates the discharge of air between the contact surfaces of the pull rod and the fixture body.

[0021] The large-bore spiral bevel gear making jig of this utility model has an anti-rotation screw threaded at one end of the jig body, which can limit the radial rotation and loosening of the pull rod.

[0022] The large inner bore spiral bevel gear tooth-making fixture of this utility model has an L-shaped anti-rotation positioning pin connected to the positioning plate, thereby limiting the radial rotation of the disc spring during operation.

[0023] This utility model relates to a large-bore spiral bevel gear tooth-making fixture, in which the outer circular surface of the butterfly spring is rounded to prevent the butterfly spring from wearing down the inner bore of the spiral bevel gear.

[0024] The large inner bore spiral bevel gear making jig of this utility model has a tapered fit between the jig body and the machine tool spindle hole, so the jig body is pushed out by the external pushing force of the set screw, which makes it easy to disassemble. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0026] Figure 2 This is a schematic diagram of the clamping body structure of this utility model.

[0027] Figure 3 This is a schematic diagram of the tie rod structure of this utility model.

[0028] Figure 4 This is a schematic diagram of the positioning tray structure of this utility model.

[0029] Figure 5 This is a front view of the disc spring of this utility model.

[0030] Figure 6 This is a side view of the butterfly spring of this utility model.

[0031] In the diagram: 1-clamp body, 2-pull rod, 201-pressure block, 202-limiting hole, 203-annular groove, 3-positioning tray, 301-chip removal groove, 4-butterfly spring, 401-wire cutting groove, 402-limiting groove, 5-anti-rotation screw, 6-anti-rotation positioning pin, 7-set screw, 8-spiral bevel gear. Detailed Implementation

[0032] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1: As Figures 1-6 As shown, a large-diameter spiral bevel gear gear making fixture includes a fixture body 1, a pull rod 2, a positioning tray 3, and an elastic expansion plate; one end of the fixture body 1 is connected to the main shaft of the equipment, and the positioning tray 3 is connected to the fixture body 1; the pull rod 2 is slidably fitted to the fixture body 1, and the elastic expansion plate is located between the pull rod 2 and the fixture body 1. The pull rod 2 moves to compress the elastic expansion plate, and the elastic expansion plate deforms and expands outward under force to increase the outer diameter.

[0034] The fixture body 1 is generally in the shape of a stepped shaft. The end of the fixture body 1 that is connected to the main shaft of the equipment is tapered. The other end of the fixture body 1 is provided with two steps. The center of the fixture body 1 is provided with a central hole.

[0035] The inner hole of the positioning tray 3 is clearance-fitted with the outer circular surface of the clamping body 1, and the positioning tray 3 is connected to the secondary step surface of the clamping body 1 by locking screws. The outer side of the positioning tray 3 is provided with several chip removal grooves 301.

[0036] The spindle section of the pull rod 2 is slidably fitted into the center hole of the clamp body 1. One end of the pull rod 2 connected to the main shaft of the equipment is provided with an external thread, and the other end is provided with an integrally formed pressure block 201.

[0037] One end of the clamp body 1 is threaded with an anti-rotation screw 5, and one end of the pull rod 2 is provided with a limiting hole 202, in which the anti-rotation screw 5 is housed.

[0038] The outer circular surface of the joint between the pull rod 2 and the clamp body 1 is provided with several annular grooves 203.

[0039] The elastic expansion piece consists of two symmetrically arranged butterfly springs 4. Several wire-cut grooves 401 are arranged in a ring array on the butterfly springs 4. The cavity between the two butterfly springs 4 and the inside of the wire-cut grooves 401 are filled with polyurethane sealant. The two butterfly springs 4 are located between the first-level step surface of the clamping body 1 and the end face of the pressure block 201.

[0040] The positioning tray 3 is connected to an L-shaped anti-rotation positioning pin 6, and the disc spring 4 is provided with a limiting groove 402, in which the anti-rotation positioning pin 6 is engaged.

[0041] The outer surface of the disc spring 4 is rounded.

[0042] Example 2: This example is a further improvement on Example 1. The main improvement is that, in Example 1, because the spindle hole of the equipment is a tapered hole and the tail of the fixture body 1 is tapered, it is not easy to pull out the fixture when changing molds; while in this example, the above defects can be avoided. Specifically:

[0043] The fixture body 1 has a threaded through hole on the secondary step surface, and the set screw 7 is threaded into the threaded through hole. In this embodiment, since the fixture body 1 and the machine tool spindle hole are taper-fitted, the fixture body 1 is pushed out by the external thrust of the set screw 7, so as to facilitate disassembly.

[0044] Apart from the above, this embodiment is exactly the same as Embodiment 1, and will not be described again here.

[0045] The specific working principle of this utility model is as follows:

[0046] Before operation, the fixture 1 is taper-fitted to the machine tool spindle bore and bolted to the spindle flange. One end of the pull rod 2 is connected to the piston rod of the hydraulic cylinder inside the spindle box. During operation, the operator places the inner hole of the spiral bevel gear 8 onto the outside of the disc spring 4, with the spiral bevel gear 8 pressed tightly against the outer side of the positioning tray 3. The hydraulic cylinder retracts, pulling the pull rod 2. The pressure block 201 at one end of the pull rod 2 compresses the disc spring 4, causing the disc spring 4 to deform and expand outward to tighten the inner hole of the spiral bevel gear 8, thus completing the clamping of the spiral bevel gear 8. This allows for gear milling, grinding, polishing, and rolling inspection. After processing, the hydraulic cylinder extends, pushing the pull rod 2, and the disc spring 4 returns to its original position, allowing the operator to remove the spiral bevel gear 8.

[0047] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A large bore spiral bevel gear tooth cutting jig characterized by: It includes a clamping body (1), a pull rod (2), a positioning tray (3) and an elastic expansion piece; one end of the clamping body (1) is connected with a main shaft of equipment, the positioning tray (3) is connected to the clamping body (1); the pull rod (2) is slidingly fitted in the clamping body (1), the elastic expansion piece is located between the pull rod (2) and the clamping body (1), the pull rod (2) moves to extrude the elastic expansion piece, and the elastic expansion piece is deformed to expand outward to increase the outer diameter.

2. A gear j ig for machining a spiral bevel gear having a large bore as set forth in claim 1, characterized in that: The clamping body (1) is in the shape of a stepped shaft as a whole, one end of the clamping body (1) connected with the main shaft of equipment is in the shape of a cone, the other end of the clamping body (1) is provided with two stepped surfaces, and a central hole is arranged at the center of the clamping body (1).

3. A gear j ig for machining a spiral bevel gear for a large bore, as set forth in claim 2, wherein: The inner hole of the positioning tray (3) is clearance-fitted with the outer cylindrical surface of the clamping body (1), the positioning tray (3) is connected to the second stepped surface of the clamping body (1) through locking screws, and the outer side surface of the positioning tray (3) is provided with a plurality of chip removal grooves (301).

4. A gear j ig for machining a spiral bevel gear having a large bore as set forth in claim 2, wherein: The core shaft section of the pull rod (2) is slidingly fitted in the central hole of the clamping body (1), one end of the pull rod (2) connected with the main shaft of equipment is provided with external threads, and the other end is provided with a pressing block (201).

5. A jig for generating spiral bevel gear teeth in a large bore spiral bevel gear as defined in claim 2 or 4 wherein: One end of the clamping body (1) is threadedly fitted with an anti-rotation screw (5), one end of the pull rod (2) is provided with a limiting hole (202), and the anti-rotation screw (5) is accommodated in the limiting hole (202).

6. A gear j ig for machining a spiral bevel gear having a large bore as set forth in claim 4, wherein: The outer cylindrical surface of the pull rod (2) at the fitting position with the clamping body (1) is provided with a plurality of annular grooves (203).

7. A gear j ig for helical bevel gears having a large bore as defined in claim 4 wherein: The elastic expansion piece is two symmetrical butterfly springs (4), a plurality of wire cutting grooves (401) are arranged in an annular array on the butterfly spring (4), a polyurethane sealant is filled in the cavity between the two butterfly springs (4) and the wire cutting grooves (401), and the two butterfly springs (4) are located between the first stepped surface of the clamping body (1) and the end surface of the pressing block (201).

8. A gear j ig for machining a spiral bevel gear having a large bore as set forth in claim 7, characterized in that: The positioning tray (3) is connected with an L-shaped anti-rotation positioning pin (6), the butterfly spring (4) is provided with a limiting groove (402), and the anti-rotation positioning pin (6) is clamped in the limiting groove (402).

9. A gear j ig for machining a spiral bevel gear having a large bore as set forth in claim 7, wherein: The outer cylindrical surface of the butterfly spring (4) is rounded.

10. A gear j ig for machining a spiral bevel gear having a large bore as set forth in claim 3, wherein: The second stepped surface of the clamping body (1) is provided with a threaded through hole, and a jackscrew (7) is threadedly fitted in the threaded through hole.

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