Automatic retreating device of crankshaft timing bevel gear mounting clamp

Abstract

An automatic returning device of a crankshaft timing bevel gear installation clamp is used in the field of automobile part manufacturing. The base is connected to the upper portion of the base, the pressing block is in fastening fit with the positioning block, the pressing block is attached to the gaskets arranged on the inner sides of the first guide plate and the second guide plate, the compression spring is fixed between the gaskets and the base, and a pressing block groove is formed in the outer circle of the pressing block. One end of the clamping plate is in contact with the button, a boss at the other end of the clamping plate is in contact with the top of the pagoda pressure spring, the clamping plate is in sliding connection with guide plate grooves in the two sides of the clamping plate, the bottom of the pagoda pressure spring is fixed to a groove of a pagoda pressure spring fixing plate, and the clamping plate is in contact with the pressing block under the action of telescopic force of the pagoda pressure spring and jacks up the button so that the button can be in contact with the baffle; and a cover plate is arranged on the guide plate. During installation, an operator only needs to press down the pressing block to enable the positioning block to be meshed with the mark teeth, after the timing bevel gear is installed in place, the button is in contact with the stop iron of the machine tool, the clamping plate is stressed to return, the positioning block automatically returns under the action of thrust of the compression spring, and the production efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts manufacturing, and specifically relates to an automatic retracting device for a crankshaft timing helical gear installation fixture. Background Art

[0002] The function of installing the crankshaft timing helical gear is to ensure the valve timing during the operation of the engine, so that the opening and closing of the intake and exhaust valves are consistent with the piston movement phase, to ensure the accuracy of the crankshaft timing position, and to improve its transmission efficiency and reliability. In the crankshaft machining process, heating and installing the timing helical gear requires the use of a special fixture to clamp and position it to ensure that the position of the marked tooth on the timing helical gear matches the mark on the camshaft gear.

[0003] When installing the crankshaft timing helical gear, the positioning block of the special fixture for timing helical gear installation is fixed on the base, and the base is installed on the timing helical gear installation machine tool. Move the limit plate, and through the telescopic action of the compression spring, engage the positioning block with the marked tooth of the timing helical gear, and place the installation journal of the crankshaft timing helical gear on the workbench of the timing helical gear installation machine tool for positioning. Operate the timing helical gear installation machine tool to install the timing helical gear to ensure that the installation angle of the timing helical gear meets the requirements. After the installation is completed, use the same method to reset the positioning block and retract the fixture. However, this fixture retracting device has great limitations:

[0004] Both the clamping and loosening of the timing helical gear require manual movement of the limit plate. Relying on the telescopic action of the compression spring, the relative movement of the fixture positioning block is complex in operation and low in efficiency.

[0005] After the timing helical gear is installed in place, if the fixture positioning block cannot be reset in time, it may cause damage to the meshing part of the marked tooth and the positioning block, resulting in an out-of-tolerance axial dimension of the reference surface of the timing helical gear, and it is impossible to ensure the quality stability during the crankshaft machining process. Summary of the Invention

[0006] To overcome the deficiencies of the prior art, the invention purpose of the utility model is to provide an automatic retracting device for a crankshaft timing helical gear installation fixture to realize the automatic pressing and retracting of the fixture positioning block.

[0007] To achieve the above-mentioned invention object, the base of the utility model is connected above the base through bolt two and pin two. The pressing block and the positioning block are tightly fitted through bolt one and pin one. The pressing block is in contact with the washer placed inside guide plate one and guide plate two. The compression spring is fixed between the washer and the base. A pressing block groove for clamping the clamping plate is provided on the outer circle of the pressing block; one end of the clamping plate contacts the button, and the other end's boss position contacts the top of the pagoda compression spring. The clamping plate is slidably connected to the grooves of the guide plate one and guide plate two on both sides of it. The bottom of the pagoda compression spring is fixed on the groove of the pagoda compression spring fixing plate. The clamping plate contacts the pressing block under the action of the expansion and contraction force of the pagoda compression spring and pushes up the button, making the button contact the baffle; A cover plate is installed above the guide plate one and guide plate two.

[0008] Further, the pressing block is placed inside the circular cavity of the clamping plate and can move inside the circular cavity of the clamping plate; the pressing block groove is located above the center line of the pagoda compression spring.

[0009] Further, the cover plate is welded to the guide plate one and guide plate two, and the guide plate one, guide plate two, pagoda compression spring fixing plate, and baffle are all welded to the base.

[0010] Further, the button protrudes outside the baffle.

[0011] Further, when the pressing block is pressed down, the compression spring is in a compressed state, the pagoda compression spring is in a natural state, the outer circle of the circular cavity of the clamping plate is stuck on the pressing block groove of the pressing block, and the fixture is in a clamped state; when the stop iron of the machine tool contacts the button when the timing helical gear is installed, the pagoda compression spring is in a compressed state, the compression spring is in a natural state, the outer circle of the circular cavity of the clamping plate is stuck on the outer circle of the pressing block, and the fixture is in a retracted state.

[0012] Further, a bracket is installed on the base. The inner side of the bracket is an arc structure, and the radius of the circle formed by the arcs on the inner sides of multiple brackets is the same as the outer circle radius of the timing helical gear.

[0013] Further, a V-shaped groove is provided at the bottom end of the positioning block. The angle of the V-shaped groove is the same as the helix angle of the timing helical gear, and the included angle between the center line of the V-shaped groove and the center line of the P6 connecting rod neck of the crankshaft is α.

[0014] Compared with the prior art, during installation, the operator only needs to press the pressing block to make the positioning block engage with the marking teeth. When the timing helical gear is installed in place, the button contacts the machine tool stop iron. Due to the clearance fit between the clamping plate and the pressing block groove, at this time, the clamping plate is forced to retract, and under the thrust of the compression spring, the positioning block automatically retracts. The utility model simplifies the complex operation, reduces the labor intensity of the operator, improves the production efficiency, and reduces the quality problems caused by human factors. Description of the Drawings

[0015] Figure 1 The front view structural sketch of the present utility model

[0016] Figure 2 is Figure 1 the A-A sectional view of

[0017] Figure 3 is Figure 1 the left view of

[0018] In the figure: 1. P6 connecting rod journal center line; 2. positioning block; 3. base; 4. guide plate 1; 5. cover plate; 6. pressing block; 7. marking tooth reference point center line; 8. bolt 1; 9. pin 1; 10. guide plate 2; 11. clamping plate; 12. washer; 13. compression spring; 14. bolt 2; 15. pagoda compression spring fixing plate; 16. pagoda compression spring; 17. pin 2; 18. baffle; 19. button; 20. marking tooth reference surface; 21. base; 22. stop iron; 23. P6 connecting rod journal; 24. timing helical gear; 25. gear mounting journal; 26. crankshaft; 27. pressing block groove; 28. circular cavity; 29. V-shaped groove; 30. bracket. Specific embodiments

[0019] Such as Figure 1 , Figure 2 , Figure 3As shown, the base 3 of the utility model is connected above the base 21 through the second bolt 14 and the second pin 17; the pressing block 6 and the positioning block 2 are tightly fitted through the first bolt 8 and the first pin 9. The pressing block 6 is in contact with the washer 12 placed inside the first guide plate 4 and the second guide plate 10. The compression spring 13 is fixed between the washer 12 and the base 3. A pressing block groove 27 for clamping the clamping plate 11 is provided on the outer circle of the pressing block 6. The pressing block groove 27 is located above the center line of the conical compression spring 16. The pressing block 6 is placed inside the circular cavity 28 of the clamping plate 11 and can move inside the circular cavity 28 of the clamping plate 11. One end of the clamping plate 11 is in contact with the button 19, and the other end's boss position is in contact with the top of the conical compression spring 16. The clamping plate 11 is slidably connected to the grooves of the first guide plate 4 and the second guide plate 10 on both sides of it. The width of the groove is slightly larger than the thickness of the clamping plate 11. The bottom of the conical compression spring 16 is fixed in the groove of the conical compression spring fixing plate 15. The clamping plate 11 contacts the pressing block 6 under the action of the expansion and contraction force of the conical compression spring 16 and pushes up the button 19, so that the button 19 contacts the baffle 18, and the button 19 protrudes outside the baffle 18. A cover plate 5 is installed above the first guide plate 4 and the second guide plate 10. The cover plate 5 is welded to the first guide plate 4 and the second guide plate 10. The first guide plate 4, the second guide plate 10, the conical compression spring fixing plate 15, and the baffle 18 are all welded and connected to the base 3. When the pressing block 6 is pressed, the compression spring 13 is forced to compress downward, and the compression spring 13 is in a compressed state. The conical compression spring 16 is in a natural state. When the outer circle of the circular cavity 28 of the clamping plate 11 is stuck on the pressing block groove 27 of the pressing block 6, the fixture is in a clamping state. When the stop 22 of the machine tool for installing the positive helical gear contacts the button 19, the conical compression spring 16 is in a compressed state, the compression spring 13 is in a natural state, and when the outer circle of the circular cavity 28 of the clamping plate 11 is stuck on the outer circle of the pressing block 6, the fixture is in a retracted state.

[0020] A bracket 30 is installed on the base 21. The inner side of the bracket 30 is an arc structure. The radius of the circle formed by the arcs on the inner sides of multiple brackets 30 is the same as the outer circle radius of the positive helical gear 24. A V-shaped groove 29 is provided at the bottom end of the positioning block 2. The angle of the V-shaped groove 29 is the same as the helix angle of the positive helical gear 24. The included angle between the center line of the V-shaped groove 29 and the center line 1 of the P6 connecting rod journal of the crankshaft 26 is α. The technical requirement for installing the positive helical gear 24 is that the included angle between the center line 7 of the marked tooth reference point of the positive helical gear 24 and the center line 1 of the P6 connecting rod journal of the crankshaft 26 is α. The marked tooth reference plane 20 of the positive helical gear 24 is a cross-section at a distance of L from its installation end face dimension.

[0021] When installing the timing helical gear 24: First, install and fix the base 21 on the timing helical gear installation machine tool, and then place the gear mounting journal 25 of the crankshaft 26 on the workbench of the timing helical gear installation machine tool for positioning; Then the operator installs the timing helical gear 24 on the fixture, aligns the marked tooth of the timing helical gear 24 with the V-shaped groove 29 of the positioning block 2, makes the spiral angle of the marked tooth coincide with that of the V-shaped groove 29, and after the end face of the timing helical gear 24 with the marked tooth identification fits against the bracket 30 on the base 21 and the base 21, press the pressing block 6, the compression spring 13 is forced to compress downward, and the outer circle of the circular cavity 28 of the clamping plate 11 fits against the pressing block groove 27 of the pressing block 6 under the thrust of the pagoda compression spring 16, and the button 19 is pushed up; At this time, the operator operates the timing helical gear installation machine tool to install the timing helical gear 24 on the gear mounting journal 25 of the crankshaft 26 to ensure that the installation angle of the timing helical gear 24 meets the requirements.

[0022] When the timing helical gear 24 is installed on the gear mounting journal 25, the stop iron 22 of the timing helical gear installation machine tool contacts the button 19, causing the button 19 to compress the pagoda spring 16 under force, the clamping plate 11 leaves the pressing block groove 27 of the pressing block 6, and the positioning block 2 pops up under the thrust of the compression spring 13. The washer 12 moves to the step position of the guide plate one 4 and the guide plate two 10 and stops. At this time, the positioning block 2 is reset. Thus, the purpose of automatically retracting the positioning block 2 of the fixture can be achieved.

Claims

1. An automatic retraction device for a crankshaft timing helical gear installation fixture, characterized in that: The base (3) is connected above the base (21) through the second bolt (14) and the second pin (17). The pressing block (6) and the positioning block (2) are tightly fitted through the first bolt (8) and the first pin (9). The pressing block (6) is in contact with the washer (12) placed inside the first guide plate (4) and the second guide plate (10). The compression spring (13) is fixed between the washer (12) and the base (3). A pressing block groove (27) for clamping the clamping plate (11) is provided on the outer circle of the pressing block (6); one end of the clamping plate (11) is in contact with the button (19), and the other end of the boss position is in contact with the top of the pagoda compression spring (16). The clamping plate (11) is slidably connected to the grooves of the first guide plate (4) and the second guide plate (10) on both sides of it. The bottom of the pagoda compression spring (16) is fixed in the groove of the pagoda compression spring fixing plate (15). The clamping plate (11) contacts the pressing block (6) under the action of the expansion and contraction force of the pagoda compression spring (16) and pushes up the button (19) to make the button (19) contact the baffle (18); a cover plate (5) is installed above the first guide plate (4) and the second guide plate (10).

2. The automatic retraction device of a crankshaft timing helical gear installation fixture according to claim 1, characterized in that: The pressing block (6) is placed in the circular cavity (28) of the clamping plate (11) and can move in the circular cavity (28) of the clamping plate (11); the pressing block groove (27) is located above the center line of the pagoda compression spring (16).

3. The automatic retraction device of a crankshaft timing helical gear installation fixture according to claim 1, characterized in that: The cover plate (5) is welded to the first guide plate (4) and the second guide plate (10). The first guide plate (4), the second guide plate (10), the pagoda compression spring fixing plate (15), and the baffle (18) are all welded and connected to the base (3).

4. The automatic retraction device of a crankshaft timing helical gear installation fixture according to claim 1, characterized in that: The button (19) protrudes outside the baffle (18).

5. The automatic retraction device of a crankshaft timing helical gear installation fixture according to claim 1, characterized in that: When the pressing block (6) is pressed down, the compression spring (13) is in a compressed state, the pagoda compression spring (16) is in a natural state, and the outer circle of the circular cavity (28) of the clamping plate (11) is stuck on the pressing block groove (27) of the pressing block (6), and the fixture is in a clamped state; when the stop iron (22) of the timing helical gear installation machine contacts the button (19), the pagoda compression spring (16) is in a compressed state, the compression spring (13) is in a natural state, and the outer circle of the circular cavity (28) of the clamping plate (11) is stuck on the outer circle of the pressing block (6), and the fixture is in a retracted state.

6. The automatic retraction device of a crankshaft timing helical gear installation fixture according to claim 1, characterized in that: A bracket (30) is installed on the base (21). The inner side of the bracket (30) is an arc structure, and the radius of the circle formed by the arcs on the inner sides of multiple brackets (30) is the same as the outer circle radius of the timing helical gear (24).

7. The automatic retraction device of a crankshaft timing helical gear installation fixture according to claim 1, characterized in that: A V-shaped groove (29) is provided at the bottom end of the positioning block (2). The angle of the V-shaped groove (29) is the same as the helix angle of the timing helical gear (24), and the included angle between the center line of the V-shaped groove (29) and the center line (1) of the P6 connecting rod neck of the crankshaft (26) is α2.

Images