Worm gear and worm clearance detection clamp for electric steering gear

Abstract

The utility model relates to a worm and gear clearance detection clamp for an electric steering gear, and belongs to the technical field of worm and gear clearance detection equipment. The electric steering gear worm and gear gap detection clamp comprises a bottom plate, a detector, a main supporting piece, a supporting block A, a supporting block B, a positioning pin, a pressing air cylinder, a pressing head, a supporting vertical base A, a supporting vertical base B, a pressing screw rod and a limiting stopper. A main supporting piece is arranged in the middle of the bottom plate; a supporting block A and a supporting block B are respectively arranged on the bottom plate on two sides of the main supporting piece; positioning pins are mounted on the supporting block A and the supporting block B; a pressing head is arranged on one side of the positioning pin through a pressing air cylinder. The worm and gear gap detection clamp for the electric steering gear is compact in structure and ingenious in design, solves the problem that an existing gap detection mode cannot detect an integrated electric steering gear, and is particularly suitable for the detection and use requirements of the integrated electric steering gear.

Description

Technical Field

[0001] This utility model relates to a worm gear clearance detection fixture for electric steering gears, belonging to the technical field of worm gear clearance detection equipment. Background Technology

[0002] Worm gear transmission, as the amplification device of the motor torque output in automotive electric power steering, plays a crucial role in transmitting force. Excessive or insufficient worm gear meshing clearance increases the risk of abnormal noise in the electric power steering system and affects steering feel. Currently, the conventional method involves adding inspection at the front-end stage. Specifically, before factory testing, the worm gear is separately installed in the steering gear's intermediate housing, and the meshing torque is measured to ensure it is within a specified range, indirectly determining the worm gear meshing clearance. However, for electric power steering systems with a one-piece housing structure, the front-end stage cannot separately install the worm gear into the intermediate housing for inspection due to the product structure. Large components such as the rack and main housing are also required, resulting in a large product size. Conventional methods are limited by equipment space and the steering gear structure, making inspection impossible. Therefore, it is necessary to develop a new inspection fixture to address the aforementioned problems with existing worm gear clearance inspection methods for electric power steering systems. Summary of the Invention

[0003] The purpose of this utility model is to provide a compact and ingeniously designed electric steering gear worm gear clearance detection fixture that solves the problem that existing clearance detection methods for electric steering gears cannot detect integrated electric steering gears.

[0004] The technical solution of this utility model is:

[0005] A worm gear clearance detection fixture for an electric steering gear includes a base plate, a detector, a main support member, support block A, support block B, a positioning pin, a clamping cylinder, a pressure head, a support stand A, a support stand B, a clamping screw, and a limiter; characterized in that: the main support member is mounted in the middle of the base plate; support blocks A and B are respectively mounted on the base plates on both sides of the main support member; positioning pins are installed on both support blocks A and B; a pressure head is mounted on one side of the positioning pin via the clamping cylinder; a limiter is mounted on the base plate on one side of support block A via support stand A; support stand B is mounted on the base plate on one side of support block B; a clamping screw is threaded onto support stand B; a handle is fixedly mounted on one end of the clamping screw.

[0006] The limiter includes a support rod and a limit block; the support rod is movably mounted on the support stand A at an incline; one end of the support rod is fitted with a limit plate by a locking bolt; and multiple limit blocks are mounted on the support rod.

[0007] The support rod is provided with a limiting groove on its lower side; the support rod is connected to the support stand A through the limiting groove; the support rod is provided with locking planes on both sides; and multiple limiting blocks are installed on the support rod through the locking planes.

[0008] The detector includes a frame, an angle gauge, mounting bolts, a force-applying rod, and a positioning ring; one end of the force-applying rod is mounted on the frame via the mounting bolts; the angle gauge is mounted on the frame; the other end of the force-applying rod is provided with a clamping four-jaw chuck; and a positioning ring is mounted on the force-applying rod via a bearing.

[0009] The surface of the force-adding rod is provided with a clamping flat square.

[0010] The advantages of this utility model are:

[0011] This electric steering gear worm gear clearance testing fixture has a compact structure and ingenious design. With the help of a limit switch, it can measure the clearance value at different meshing points with high accuracy. It solves the problem that existing clearance testing methods cannot be used to test integrated electric steering gears, and is particularly suitable for the needs of testing integrated electric steering gears. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of this utility model;

[0015] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0016] Figure 5 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 6 for Figure 1 Enlarged structural diagram at point A;

[0018] Figure 7 This is a schematic cross-sectional view of the detector 25 of this utility model;

[0019] Figure 8 for Figure 5 Enlarged structural diagram at point C;

[0020] Figure 9 for Figure 1 Enlarged structural diagram at point D;

[0021] Figure 10This is a structural schematic diagram of the support rod and limiting block of this utility model.

[0022] In the diagram: 1. Base plate; 2. Main support component; 3. Support block A; 4. Support block B; 5. Positioning pin; 6. Clamping cylinder; 7. Pressure head; 8. Limiter; 9. Support stand A; 10. Support stand B; 11. Clamping screw; 12. Handle; 13. Support rod; 14. Locking bolt; 15. Limiting piece; 16. Limiting block; 17. Limiting groove; 18. Snap-fit ​​surface; 19. Clamping flat bar; 20. Force rod; 21. Assembly bolt; 22. Table holder; 23. Clamping four-jaw jack; 24. Positioning ring; 25. Detector. Detailed Implementation

[0023] The electric steering gear worm gear clearance detection fixture includes a base plate 1, a detector 25, a main support 2, a support block A3, a support block B4, a locating pin 5, a clamping cylinder 6, a pressure head 7, a support stand A9, a support stand B10, a clamping screw 11, and a limiter 8 (see the instruction manual appendix). Figure 1 and 2 ).

[0024] The base plate 1 is equipped with a main support component 2 in the middle; during operation, the main support component 2 has the function of supporting the workpiece from the middle.

[0025] Support blocks A3 and B4 are respectively mounted on the base plates 1 on both sides of the main support component 2 (see the instruction manual appendix). Figure 1 and 2 Positioning pins 5 are installed on both support blocks A3 and B4; a pressure head 7 is mounted on one side of the positioning pin 5 via a clamping cylinder 6 (see instruction manual appendix). Figure 1 and 9 ).

[0026] During operation, after the workpiece is placed on the support block A3 and support block B4 by the positioning pin 5, the clamping cylinder 6 can clamp and fix the workpiece on the support block A3 and support block B4 by the pressure head 7.

[0027] Limiters 8 are mounted on the base plate 1 on one side of the support block A3 via support bracket A9 (see instruction manual appendix). Figure 1 , 2 And 5). The limiter 8 includes a support rod 13 and a limit block 16 (see the instruction manual appendix). Figure 8 and 10 ).

[0028] A support rod 13 is movably mounted at an angle on the support base A9; a limiting groove 17 is provided on the lower side of the support rod 13; the support rod 13 is connected to the support base A9 through the limiting groove 17; a limiting piece 15 is mounted on one end of the support rod 13 through a locking bolt 14. The limiting piece 15 serves to prevent the support rod 13 from detaching from the support base A9.

[0029] The support rod 13 has locking surfaces 18 on both sides; multiple limit blocks 16 are mounted on the support rod 13 through the locking surfaces 18. During operation, the number of limit blocks 16 can be increased or decreased as needed by detection.

[0030] A support stand B10 is mounted on the base plate 1 on one side of the support block B4; a clamping screw 11 is threaded onto the support stand B10; a handle 12 is fixedly mounted on one end of the clamping screw 11 (see the instruction manual appendix). Figure 2 and 5 During operation, the clamping screw 11 can be moved relative to the support base B10 by rotating the handle 12.

[0031] The detector 25 includes a frame 22, an angle gauge, mounting bolts 21, a force-applying rod 20, and a positioning ring 24. One end of the force-applying rod 20 is mounted to the frame 22 via the mounting bolts 21. The angle gauge is mounted on the frame 22. The other end of the force-applying rod 20 is provided with a clamping four-jaw 23. The positioning ring 24 is mounted on the force-applying rod 20 via a bearing (see the attached instruction manual). Figure 6 and 7 ).

[0032] The surface of the extension rod 20 is provided with a clamping flat bar 19 (see the instruction manual). Figure 6 During operation, the force-applying rod 20 can be rotated by clamping the flat bar 19.

[0033] When the electric steering gear worm gear clearance detection fixture is working, the workpiece is first placed on the main support 2, support block A3 and support block B4. Then the clamping cylinder 6 is activated to clamp and fix the workpiece on support block A3 and support block B4 through the pressure head 7.

[0034] After the above work is completed, adjust the number of limit blocks 16 as needed so that they correspond to the positions of a set of workpiece meshing points; then rotate the clamping screw 11 by the handle 12 to tighten the workpiece.

[0035] After the clamping screw 11 tightens the workpiece, align the clamping jaws 23 on the detector 25 with the worm gear jaws on the workpiece and install them together. Then, slide the positioning ring 24 into the mounting hole of the workpiece housing to engage, and place the angle gauge on the holder 22 for magnetic fixation. Use a wrench to adjust the mounting bolts 21, adjust the holder 22 to be level with the base plate 1, and then tighten the mounting bolts 21. Finally, adjust the angle gauge to zero.

[0036] After the angle gauge is zeroed, the force-applying rod 20 is rotated by clamping the flat square 19 with a digital torque wrench, causing it to drive the worm gear of the workpiece to rotate together. During the rotation of the worm gear, it is restricted by the limit block 16, and it can only rotate within a quarter turn. At this time, the angle gauge can complete one worm gear clearance measurement.

[0037] After the above actions are completed, adjust the number of limit blocks 16 to correspond to the position of the meshing point of another set of workpieces; then complete one worm gear clearance measurement; in this way, the clearance detection fixture can measure the clearance value at different meshing points; its detection is more scientific and accurate. After the detection is completed, the next work cycle can begin.

[0038] This electric steering gear worm gear clearance testing fixture has a compact structure and ingenious design. With the cooperation of the limiter 8, it can measure the clearance value at different meshing points with high detection accuracy. It solves the problem that existing clearance detection methods cannot be used to test integrated electric steering gears, and is particularly suitable for the needs of integrated electric steering gear testing.

Claims

1. A worm gear clearance detection fixture for an electric steering gear, comprising a base plate (1), a detector (25), a main support (2), a support block A (3), a support block B (4), a positioning pin (5), a clamping cylinder (6), a pressure head (7), a support stand A (9), a support stand B (10), a clamping screw (11), and a limiter (8); characterized in that: The base plate (1) is equipped with a main support member (2) in the middle; support blocks A (3) and support blocks B (4) are respectively installed on the base plates (1) on both sides of the main support member (2); positioning pins (5) are installed on both support blocks A (3) and support blocks B (4); a pressure head (7) is installed on one side of the positioning pin (5) through a pressure cylinder (6); a limiter (8) is installed on the base plate (1) on one side of the support block A (3) through a support stand A (9); a support stand B (10) is installed on the base plate (1) on one side of the support block B (4); a pressure screw (11) is threaded on the support stand B (10); a handle (12) is fixedly installed at one end of the pressure screw (11).

2. The electric steering gear worm gear clearance detection fixture according to claim 1, characterized in that: The limiter (8) includes a support rod (13) and a limit block (16); the support stand A (9) is inclined and movablely equipped with the support rod (13); one end of the support rod (13) is equipped with a limit piece (15) by a locking bolt (14); and multiple limit blocks (16) are installed on the support rod (13).

3. The electric steering gear worm gear clearance detection fixture according to claim 2, characterized in that: The support rod (13) is provided with a limiting groove (17) on its lower side; the support rod (13) is connected to the support stand A (9) through the limiting groove (17); the support rod (13) is provided with a snap-fit ​​surface (18) on both sides; and multiple limiting snap-fit ​​blocks (16) are installed on the support rod (13) through the snap-fit ​​surface (18).

4. The electric steering gear worm gear clearance detection fixture according to claim 1, characterized in that: The detector (25) includes a frame (22), an angle gauge, a mounting bolt (21), a force-applying rod (20), and a positioning ring (24); one end of the force-applying rod (20) is mounted on the frame (22) via the mounting bolt (21); the angle gauge is mounted on the frame (22); the other end of the force-applying rod (20) is provided with a clamping four-jaw jack (23); the positioning ring (24) is mounted on the force-applying rod (20) via a bearing.

5. The electric steering gear worm gear clearance detection fixture according to claim 4, characterized in that: The surface of the force-adding rod (20) is provided with a clamping flat square (19).

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