Floating positioning timing hobbing fixture

Abstract

The utility model discloses a floating positioning timing hobbing fixture, installs the positioning key on the mandrel, and the positioning pad is sleeved on the mandrel, and the keyway of positioning pad is installed with the cooperation of positioning key, and positioning pad is installed with the clearance cooperation of mandrel, and the base is sleeved on the outside of mandrel, and the base bottom is fixed with mandrel, and the spring is sleeved on the mandrel between the boss in base and positioning pad, and the gland is arranged on the mandrel above the base, and the nut is installed on the upper end of mandrel. The utility model discloses a floating positioning timing hobbing fixture, adopts the spring support positioning pad to float up and down, can solve the problem of the inconsistent size of forging boss, utilizes the positioning key to limit the rotation of positioning pad on the mandrel, thereby guarantees the angle direction of the workpiece of each installation consistent, improves the processing efficiency and precision.

Description

Technical Field

[0001] This utility model relates to the field of fixtures for gear production. Background Technology

[0002] Camshaft gears are key components of automobile engines, such as... Figure 1 and Figure 2 As shown, sensors are typically mounted on camshaft gears. The sensors are connected to the gears using cylindrical pins for positioning and bolts for locking. Therefore, the camshaft gears have pin holes and bolt holes. These pin holes and bolt holes have a timing angle relationship with the teeth. To ensure the holes are machined on the forged boss of the gear, the timing angle between the boss and the teeth must be maintained during gear hobbing, specifically the angle between the boss centerline 17 and the tooth centerline 18 in the diagram. The existing machining method involves single-piece scribing and alignment, which results in low machining efficiency and low precision. Summary of the Invention

[0003] To address the aforementioned problems with existing camshaft gear hobbing methods, this invention provides a floating positioning timing hobbing fixture.

[0004] The technical solution adopted by this utility model to achieve the above-mentioned objectives is as follows: a floating positioning timing gear hobbing fixture, a positioning key 7 is installed on the spindle 3, a positioning pad 5 is fitted on the spindle 3, the keyway 16 of the positioning pad 5 is installed in conjunction with the positioning key 7, the positioning pad 5 is installed in a clearance fit with the spindle 3, a base 1 is fitted on the outside of the spindle 3, the bottom of the base 1 is fixed to the spindle 3, a spring 4 is fitted on the spindle 3 between the inner boss 19 of the base and the positioning pad 5, a pressure cap 8 is provided on the spindle 3 above the base 1, and a nut 12 is installed on the upper end of the spindle 3.

[0005] The upper inner edge of the positioning pad 5 is provided with a positioning groove 13 that is installed in conjunction with the workpiece 9.

[0006] The positioning pad 5 has a limiting groove 14 on its outer side, and the end of the limiting screw 8, which is horizontally installed on the base 1, is located in the limiting groove 14.

[0007] An open washer 11 is installed on the mandrel 3 between the nut 12 and the gland 10.

[0008] The positioning key 7 is mounted on the spindle 3 by the positioning key fixing screw 6.

[0009] The lower end of the mandrel 3 is provided with a mandrel flange 15, and the base 1 and the mandrel flange 15 are fixed together by a mandrel fixing screw 2.

[0010] This utility model of a floating positioning timing gear hobbing fixture uses a spring-supported positioning pad that floats up and down, which can solve the problem of inconsistent dimensions of forging bosses. The positioning key restricts the rotation of the positioning pad on the mandrel, thereby ensuring that the angle and direction of the workpiece are consistent each time it is installed, thus improving processing efficiency and accuracy. Attached Figure Description

[0011] Figure 1 This is a top view of the camshaft gear.

[0012] Figure 2 This is a front sectional view of the camshaft gear.

[0013] Figure 3 This is a front cross-sectional view of the floating positioning timing gear hobbing fixture of this utility model.

[0014] Figure 4 This is a top view of the positioning pad of the floating positioning timing gear hobbing fixture of this utility model.

[0015] Figure 5 yes Figure 4 AA sectional view.

[0016] In the diagram: 1. Base, 2. Spindle fixing screw, 3. Spindle, 4. Spring, 5. Positioning pad, 6. Positioning pad fixing screw, 7. Positioning key, 8. Limiting screw, 9. Workpiece, 10. Pressure cap, 11. Open washer, 12. Nut, 13. Positioning groove, 14. Limiting groove, 15. Spindle flange, 16. Keyway, 17. Boss center line, 18. Tooth center line, 19. Inner boss of base. Detailed Implementation

[0017] The floating positioning timing gear hobbing fixture of this utility model is as follows: Figure 3-5 As shown, the positioning key 7 is fixed to the spindle 3 by the positioning key fixing screw 6. The base 1 is placed on the spindle 3 with the positioning key 7. The lower end of the spindle 3 is provided with a spindle flange 15. The base 1 and the spindle flange 15 are fixed and locked together by the spindle fixing screw 2. The spring 4 is placed on the spindle 3. The spring 4 is located between the inner boss 19 of the base and the positioning pad 5. The keyway 16 of the positioning pad 5 is aligned with the positioning key 7 and installed on the spindle 3. The positioning pad 5 and the spindle 3 are in clearance fit, and the positioning pad 5 can slide up and down on the spindle 3. The outer side of the positioning pad 5 is provided with a limiting groove 14. The end of the limiting screw 8, which is installed laterally on the base 1, is located in the limiting groove 14, which limits the range of up and down movement of the positioning pad 5. Place the workpiece 9 onto the mandrel 3. The boss on the workpiece 9 is located in the positioning groove 13 of the positioning pad 5. Place the pressure cap 9 onto the mandrel 3. The end face of the pressure cap 9 presses against the end face of the workpiece 8. Install an open washer 11 on the mandrel 3 between the nut 12 and the pressure cap 10. Install the nut 12 on the upper end of the mandrel 3. Tighten the nut 12 to clamp the workpiece.

[0018] During operation, the fixture base 1 is fixed to the gear hobbing machine worktable with screws, ensuring that the axis of the spindle 3 is aligned with the rotation center of the worktable. The workpiece 9 (camshaft gear) is installed, the pressure cap 10 and the open washer 11 are placed on top, and the nut 12 is tightened to clamp the workpiece 9. The machine tool is then started to process the workpiece. After the workpiece is processed, the nut 12 is loosened, and the open washer 11, pressure cap 10, and workpiece 9 are removed. Then, another workpiece can be installed to proceed with the next piece of processing.

Claims

1. A floating positioning timing gear hobbing fixture, characterized in that: A positioning key (7) is installed on the spindle (3), a positioning pad (5) is fitted on the spindle (3), the keyway (16) of the positioning pad (5) is fitted with the positioning key (7), the positioning pad (5) is fitted with the spindle (3) with a clearance fit, a base (1) is fitted on the outside of the spindle (3), the bottom of the base (1) is fixed to the spindle (3), a spring (4) is fitted on the spindle (3) between the inner boss (19) of the base and the positioning pad (5), a pressure cap (10) is provided on the spindle (3) above the base (1), and a nut (12) is installed on the upper end of the spindle (3).

2. The floating positioning timing gear hobbing fixture according to claim 1, characterized in that: The upper inner edge of the positioning pad (5) is provided with a positioning groove (13) that is installed in conjunction with the workpiece (9).

3. The floating positioning timing gear hobbing fixture according to claim 1, characterized in that: The positioning pad (5) has a limiting groove (14) on its outer side, and the end of the limiting screw (8) that is horizontally installed on the base (1) is located in the limiting groove (14).

4. The floating positioning timing gear hobbing fixture according to claim 1, characterized in that: An open washer (11) is installed on the mandrel (3) between the nut (12) and the gland (10).

5. The floating positioning timing gear hobbing fixture according to claim 1, characterized in that: The positioning key (7) is mounted on the spindle (3) by the positioning key fixing screw (6).

6. The floating positioning timing gear hobbing fixture according to claim 1, characterized in that: The lower end of the mandrel (3) is provided with a mandrel flange (15), and the base (1) and the mandrel flange (15) are fixed together by a mandrel fixing screw (2).

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