Clamp for installing crankshaft timing helical gear

Abstract

The invention discloses a clamp for installing a crankshaft timing helical gear, and belongs to the field of automobile part manufacturing. The base is connected to the upper portion of the base through a third bolt and a second pin, the positioning block with a V-shaped groove is connected with the base in a sliding mode, the positioning block is installed at the lower end of the fixing plate through a second bolt and a first pin, the two sides of the fixing plate are connected to the base through first bolts, compression springs are connected between the first bolts and the fixing plate, and the support is installed on the base. A V-shaped groove is formed in the bottom end of the positioning block, the angle of the V-shaped groove is consistent with the helical angle of the timing helical gear, and the included angle between the center line of the V-shaped groove and the center line of a P6 connecting rod neck of the crankshaft is alpha. Installation of the crankshaft timing helical gear can be accurately and conveniently guaranteed, under the existing condition, the function of installing multiple timing helical gears of different specifications on a current machine tool can be achieved only by replacing the timing helical gear installation clamp on the same machine tool, the installation angle is accurate, operation is easy, stability is good, the manufacturing cost is reduced, and the machining efficiency is improved. And the product processing quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of automotive parts manufacturing technology, specifically a fixture for mounting crankshaft timing helical gears. Background Technology

[0002] In the process of developing new crankshaft products, the crankshaft machining process includes: rough and fine turning of the crankshaft big end and small end, milling of the crankshaft main journal and connecting rod journal, drilling and chamfering of the oil holes of the crankshaft main journal and connecting rod journal, crankshaft quenching and tempering, fine grinding of the crankshaft rear gear journal, and installation of the crankshaft timing helical gear, etc.

[0003] The purpose of designing and installing crankshaft timing helical gears is to ensure the valve timing during engine operation, so that the opening and closing of the intake and exhaust valves are consistent with the piston movement, thereby ensuring the accuracy of the crankshaft timing position.

[0004] Previously, crankshaft timing helical gears were all spur gears. Installing a timing helical gear simply involved aligning the marked teeth of the gear with the positioning device on the gear mounting fixture, then starting the machine to complete the installation. However, with the rapid development of the automotive industry, the design of crankshafts, a core automotive component, is also updating very quickly. Compared to timing spur gears, using timing helical gears offers smoother transmission, higher torque, lower noise, longer service life, and greater safety and reliability. The existing fixtures for installing timing spur gears are no longer sufficient for installing timing helical gears. Therefore, researching a fixture for installing crankshaft timing helical gears has become increasingly important. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a fixture for mounting crankshaft timing helical gears, so as to accurately and conveniently mount crankshaft timing helical gears.

[0006] To achieve the above-mentioned objectives, the base of the present invention is connected to the upper part of the base by bolt three and pin two. The positioning block with V-groove is slidably connected to the base. The positioning block is installed at the lower end of the fixing plate by bolt two and pin one. The two sides of the fixing plate are connected to the base by bolt one. A compression spring is connected between bolt one and the fixing plate. The bracket is installed on the base.

[0007] Furthermore, the bottom end of the positioning block is provided with a V-groove, the angle between the center line of the V-groove and the axis of the base is β, which is consistent with the helix angle β of the timing helical gear, and the angle between the center line of the V-groove and the center line of the P6 connecting rod journal of the crankshaft is α, which is consistent with the installation angle α of the 4th mark tooth of the timing helical gear.

[0008] Furthermore, a movable limiting plate is provided between the bolt on one side of the fixing plate and the positioning block. The upper surface of the limiting plate is in contact with the lower surface of the fixing plate, and the lower surface of the limiting plate is in contact with the upper surface of the base.

[0009] Furthermore, there are three or more brackets. The brackets are axially tightened and fixed in the slot of the base by set screws. The brackets extend out of the base plane. The inner side of the brackets is an arc structure. The radius of the circle formed by the arcs on the inner sides of the multiple brackets is consistent with the outer radius of the timing helical gear.

[0010] Furthermore, the base is provided with a rectangular guide slot, and the positioning block is fitted into the rectangular guide slot of the base. The center line of the rectangular guide slot in the length direction is parallel to the center line of the V-groove, and the angle between the center line of the rectangular guide slot in the length direction and the axis of the base is β, which is consistent with the helix angle β of the timing helical gear.

[0011] Furthermore, the fixing plate has a parallelogram structure, and the angle between its hypotenuse and the axis of the base is β, which is consistent with the helix angle β of the timing helical gear.

[0012] Furthermore, the center line of symmetry of the base and the center line of symmetry of the crankshaft are on the same vertical plane.

[0013] When installing the timing helical gear, first fix the base on the timing helical gear installation machine; then install the timing helical gear on the fixture, aligning the marked teeth of the timing helical gear with the V-groove of the positioning block, so that the marked teeth and the β-helix angle of the V-groove match. After the end face of the timing helical gear with the marked teeth G is attached to the base along the bracket, with the assistance of the limit plate, adjust the tension of the compression spring to properly press the positioning block, and then tighten the bolt with the fixing nut. Move the limit plate, and the positioning block presses down on the timing helical gear to firmly fix it on the base. Then, place the timing helical gear mounting journal of the crankshaft onto the worktable of the timing helical gear installation machine for positioning. Operate the timing helical gear installation machine to install the timing helical gear.

[0014] Compared with existing technologies, this invention can accurately and conveniently ensure the installation of crankshaft timing helical gears. Under current conditions, the same machine tool only needs to change the timing helical gear mounting fixture to meet the function of installing various different specifications of timing helical gears. The installation angle is accurate, the installation method is convenient, the operation is simple, the installation accuracy is high, the stability is good, the manufacturing cost is reduced, and the processing quality of the product is guaranteed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the timing helical gear installation.

[0016] Figure 2 for Figure 1 AA sectional view.

[0017] Figure 3 This is the main view of the structure of the present invention.

[0018] Figure 4 for Figure 3 The left view.

[0019] Figure 5 for Figure 3 Top view.

[0020] Figure 6 for Figure 3 Main view of the base structure.

[0021] Figure 7 for Figure 6 CC section view.

[0022] In the diagram: 1. Crankshaft; 2. P6 connecting rod journal; 3. Timing helical gear mounting journal; 4. Timing helical gear; 5. Reference surface; 6. Marker G; 7. Marker tooth; 8. Base; 9. Base; 10. Positioning block; 11. Fixing plate; 12. Bolt 1; 13. Bolt 2; 14. Pin 1; 15. Compression spring; 16. Fixing nut; 17. Limiting plate; 18. Bolt 3; 19. Pin 2; 20. Bracket; 21. Set screw; 22. V-groove. Detailed Implementation

[0023] like Figure 1 , Figure 2 As shown, according to the installation requirements of the timing helical gear 4 on crankshaft 1, the end face of the timing helical gear 4 has a tooth marked with the position corresponding to G6, which is a marker tooth 7. The reference surface 5 of the marker tooth 7 is a cross-section at a distance L from the mounting end face of the timing helical gear 4. The angle between the center of the marker tooth 7 on the reference surface 5 and the line connecting the center of the connecting rod journal 2 of crankshaft P6 is the installation angle α of the marker tooth 7 of the timing helical gear 4. The timing helical gear 4 is mounted on the timing helical gear mounting journal 3 of crankshaft 1. After the timing helical gear 4 is mounted on crankshaft 1, how to ensure that the installation angle α meets the technical requirements is the purpose of this invention.

[0024] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the base 9 of the fixture for mounting the crankshaft timing helical gear of the present invention is connected to the upper part of the base 8 by bolt 3 18 and pin 2 19. The positioning block 10 with V-groove 22 is slidably connected to the base 9. The positioning block 10 is installed at the lower end of the fixing plate 11 by bolt 2 13 and pin 14. The two sides of the fixing plate 11 are connected to the base 9 by bolt 1 12. A compression spring 15 is connected between bolt 1 12 and the fixing plate 11. The bracket 20 is installed on the base 8. The center line of symmetry of the base 8 and the center line of symmetry of the crankshaft 1 are on the same vertical plane.

[0025] Preferably, the bottom end of the positioning block 10 is provided with a V-groove 22, the angle between the center line of the V-groove 22 and the axis of the base 8 is β, which is consistent with the helix angle β of the timing helical gear 4, and the angle between the center line of the V-groove 22 and the center line of the P6 connecting rod neck 2 of the crankshaft 1 is α, which is consistent with the installation angle α of the marking tooth 7 of the timing helical gear 4.

[0026] Preferably, a movable limiting plate 17 is provided between the bolt 12 on one side of the fixing plate 11 and the positioning block 10. The upper surface of the limiting plate 17 is in contact with the lower surface of the fixing plate 11, and the lower surface of the limiting plate 17 is in contact with the upper surface of the base 9. After adjusting the tension of the compression spring 15 to normally press the positioning block 10, the bolt 12 is locked by the fixing nut 16. When the timing helical gear 4 is initially fixed on the bracket 20 on the base 8, and the timing helical gear 4 of the crankshaft 1 is installed on the timing helical gear mounting journal 3, the movable limiting plate 17 can make the positioning block 10 press the timing helical gear 4 firmly and reliably under the action of the compression spring 15, so as to ensure the installation accuracy between the timing helical gear 4 and the timing helical gear mounting journal 3.

[0027] Preferably, there are three brackets 20. The brackets 20 are axially tightened and fixed in the slot of the base 8 by the set screw 21. The brackets 20 extend out of the plane of the base 8. The inner side of the brackets 20 is an arc structure. The radius of the circle formed by the arcs on the inner sides of the multiple brackets 20 is the same as the outer radius of the timing helical gear 4.

[0028] Preferably, the base 9 is provided with a rectangular guide slot, and the positioning block 10 is fitted into the rectangular guide slot of the base 9. The center line of the rectangular guide slot in the length direction is parallel to the center line of the V-groove 22, and the angle between the center line of the rectangular guide slot in the length direction and the axis of the base 8 is β, which is consistent with the helix angle β of the timing helical gear 4.

[0029] Preferably, the fixing plate 11 has a parallelogram structure, and the angle between its hypotenuse and the axis of the base 8 is β, which is consistent with the helix angle β of the timing helical gear 4.

[0030] During operation, first, the base 8 is installed and fixed on the timing helical gear mounting machine. Then, the timing helical gear 4 is installed on the fixture. The marked teeth 7 of the timing helical gear 4 are aligned with the V-groove 22 of the positioning block 10. After the end face of the timing helical gear 4 with the marked teeth G6 is attached to the base 8 along the bracket 20, with the assistance of the limiting plate 17, the tension of the positioning block 10 is adjusted by the spring 15. Then, the bolt 12 is locked by the fixing nut 16. The limiting plate 17 is moved, and the positioning block 10 presses down on the timing helical gear 4 to fix it firmly on the base 8. Then, the timing helical gear mounting journal 3 of the crankshaft 1 is placed on the worktable of the timing helical gear mounting machine for positioning. The operator operates the timing helical gear mounting machine to install the timing helical gear 4 on the timing helical gear mounting journal 3. The fixture is used to ensure that the installation angle of the timing helical gear 4 meets the requirements.

[0031] After the timing helical gear 4 is installed, pull the fixing plate 11 upward to separate the V-groove 22 of the positioning block 10 from the installed gear marking tooth 7. Then move the limiting plate 17 between the bolt 12 on one side of the fixing plate 11 and the positioning block 10 to keep the positioning block 10 fixed. Take out the crankshaft 1 with the timing helical gear 4 installed, and the entire installation process is complete.

Claims

1. A fixture for mounting crankshaft timing helical gears, characterized in that: The base (9) is connected to the top of the base (8) by bolt three (18) and pin two (19). The positioning block (10) with V-groove (22) is slidably connected to the base (9). The positioning block (10) is installed on the lower end of the fixing plate (11) by bolt two (13) and pin one (14). The two sides of the fixing plate (11) are connected to the base (9) by bolt one (12). A compression spring (15) is connected between bolt one (12) and the fixing plate (11). The bracket (20) is installed on the base (8).

2. The fixture for mounting crankshaft timing helical gears according to claim 1, characterized in that: The bottom end of the positioning block (10) is provided with a V-groove (22). The angle between the center line of the V-groove (22) and the axis of the base (8) is β, which is consistent with the helix angle β of the timing helical gear (4). The angle between the center line of the V-groove (22) and the center line of the P6 connecting rod neck (2) of the crankshaft (1) is α, which is consistent with the installation angle α of the marking tooth (7) of the timing helical gear 4.

3. The fixture for mounting crankshaft timing helical gears according to claim 1, characterized in that: A movable limiting plate (17) is provided between the bolt (12) on one side of the fixed plate (11) and the positioning block (10). The upper surface of the limiting plate (17) is in contact with the lower surface of the fixed plate (11), and the lower surface of the limiting plate (17) is in contact with the upper surface of the base (9).

4. The fixture for mounting crankshaft timing helical gears according to claim 1, characterized in that: There are three or more brackets (20). The brackets (20) are axially tightened and fixed in the slot of the base (8) by the set screw (21). The brackets (20) extend out of the plane of the base (8). The inner side of the brackets (20) is an arc structure. The radius of the circle formed by the arcs on the inner side of the multiple brackets (20) is consistent with the outer radius of the timing helical gear (4).

5. The fixture for mounting crankshaft timing helical gears according to claim 1, characterized in that: The base (9) is provided with a rectangular guide slot, and the positioning block (10) is fitted into the rectangular guide slot of the base (9). The center line of the rectangular guide slot in the length direction is parallel to the center line of the V-groove (22). The angle between the center line of the rectangular guide slot in the length direction and the axis of the base (8) is β, which is consistent with the helix angle β of the timing helical gear (4).

6. The fixture for mounting crankshaft timing helical gears according to claim 1, characterized in that: The fixing plate (11) is a parallelogram structure, and the angle between its hypotenuse and the axis of the base (8) is β, which is consistent with the helix angle β of the timing helical gear (4).

7. The fixture for mounting crankshaft timing helical gears according to claim 1, characterized in that: The center line of symmetry of the base (8) and the center line of symmetry of the crankshaft (1) are on the same vertical plane.

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