A worm gear reducer with automatic adjustment of meshing clearance

Abstract

This utility model relates to a worm gear reducer with automatic meshing clearance adjustment function, belonging to the technical field of worm gear reducer equipment. The worm gear reducer with automatic meshing clearance adjustment function includes a housing, a worm wheel, and a worm. The worm wheel is installed inside the housing; the worm is disposed inside the housing below the worm wheel; the worm wheel and worm are meshed together; one end of the worm is connected to the housing via a large-angle clearance deep groove ball bearing; a fixed seat is installed inside the housing at the other end of the worm; an adjusting seat is movably mounted inside the fixed seat via a support spring; a small-end bearing is installed inside the adjusting seat; the other end of the worm is inserted into and connected to the small-end bearing. This worm gear reducer solves the problems of poor sealing and increased meshing clearance that exist in existing worm gear reducers after long-term use, and is particularly suitable for the needs of vehicle steering systems.

Description

Technical Field

[0001] This utility model relates to a worm gear reducer with automatic adjustment of meshing clearance, belonging to the technical field of worm gear reducer equipment. Background Technology

[0002] Worm gear reducers are widely used in vehicle steering systems. With increased use, the worm gear and worm gradually wear down, leading to a larger meshing clearance. When driving on bumpy roads, the impact from the ground causes a clicking noise during the worm gear transmission, affecting driving comfort. To avoid this problem, existing solutions, such as the worm gear backlash compensation mechanism for an electric power steering system disclosed in utility model patent CN223212405U, employ a method of adjusting the meshing clearance by drilling a threaded hole in the housing wall near the small end of the worm, installing an adjusting bolt, and tightening the adjusting bolt to apply force to a spring or spring steel sheet to press the worm.

[0003] While this method can meet the requirements to a certain extent, it has drawbacks such as high machining precision requirements, complex installation, increased worm gear meshing clearance due to performance degradation, and poor sealing performance after long-term use, leading to grease leakage.

[0004] Therefore, it is necessary to develop a new reducer to solve the aforementioned problems of existing reducers. Summary of the Invention

[0005] The purpose of this utility model is to provide a worm gear reducer with an automatic meshing clearance adjustment function that is compact in structure and ingenious in design, so as to solve the problems of poor sealing and increased meshing clearance in the existing worm gear reducer clearance adjustment mechanism after long-term use.

[0006] The technical solution of this utility model is: A worm gear reducer with automatic meshing clearance adjustment function includes a housing, a worm gear, and a worm. The worm gear is installed inside the housing. The worm is disposed inside the housing below the worm gear. The worm gear and worm are meshed together. The worm is characterized in that: one end of the worm is connected to the housing via a large-angle clearance deep groove ball bearing; a fixed seat is installed inside the housing at the other end of the worm; an adjusting seat is movably mounted inside the fixed seat via a support spring; a small-end bearing is installed inside the adjusting seat; and the other end of the worm is inserted into and connected to the small-end bearing.

[0007] The fixed base has a cylindrical structure; an anti-rotation positioning pin is eccentrically provided at one end of the fixed base; a guide groove is provided on the end face of the other end of the fixed base; limit claws are symmetrically provided on the fixed bases on both sides of the guide groove; an arc-shaped support plate is provided at the lower end of the fixed base between the limit claws.

[0008] The guide chute has a U-shaped structure; a spring station is provided at the bottom of the guide chute.

[0009] The guide groove is provided with a vertical slide rail on one side; an upper limit block is provided on the side of the guide groove on the side of the vertical slide rail; and an upper guide slope is provided on the upper limit block.

[0010] The adjusting seat has an elongated structure; the upper and lower parts of the adjusting seat are provided with arc-shaped protrusions; the middle part of the adjusting seat is provided with an assembly through hole; the lower end of the back of the adjusting seat is provided with a receiving groove; a supporting spring is provided in the receiving groove; the side of the adjusting seat is provided with an avoidance groove; a limit hook is provided on one side of the avoidance groove; the lower end of the limit hook is provided with a lower guide slope.

[0011] An O-ring is fitted onto the circumferential surface of the worm gear inside the small-end bearing via an assembly ring groove.

[0012] The advantages of this utility model are: This worm gear reducer with automatic meshing clearance adjustment function has a compact structure and ingenious design. It can provide support for one end of the worm through a support spring, an adjusting seat, and a small end bearing, so that the worm always tends to move closer to the worm wheel under the action of the spring force. This achieves the function of automatic meshing clearance adjustment, thereby solving the problems of poor sealing and increased meshing clearance in existing worm gear reducers after long-term use. It is particularly suitable for the needs of vehicle steering systems. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the isometric structure of this utility model; Figure 2 This is a schematic diagram of the main structure of this utility model; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction; Figure 4 for Figure 3 Enlarged structural diagram at point F; Figure 5 This is a structural schematic diagram of the worm gear and its two end accessories of this utility model; Figure 6 for Figure 5 Schematic diagram of the structure in the middle BB direction; Figure 7 for Figure 6 Schematic diagram of the CC-axis structure; Figure 8 This is a schematic diagram of the structure of the fixed base and the adjusting base of this utility model; Figure 9This is a schematic diagram of the structure of the fixed base and the adjusting base of this utility model; Figure 10 This is a schematic diagram of the structure of the fixing base of this utility model; Figure 11 This is a schematic diagram of the structure of the fixing base of this utility model; Figure 12 This is a schematic diagram of the structure of the fixing base of this utility model; Figure 13 for Figure 11 Enlarged structural diagram at point D; Figure 14 This is a schematic diagram of the structure of the adjusting seat and the supporting spring of this utility model; Figure 15 This is a schematic diagram of the structure of the adjusting seat of this utility model; Figure 16 This is a schematic diagram of the structure of the adjusting seat of this utility model; Figure 17 for Figure 15 A magnified structural diagram at point E in the middle.

[0014] In the diagram: 1. Housing; 2. Worm gear; 3. Worm; 4. Large-angle clearance deep groove ball bearing; 5. Fixed seat; 6. Support spring; 7. Adjusting seat; 8. Small end bearing; 9. Anti-rotation positioning pin; 10. Guide groove; 11. Limiting claw; 12. Arc-shaped support plate; 13. Spring position; 14. Vertical slide rail; 15. Upper limit block; 16. Upper guide slope; 17. Arc-shaped protrusion; 18. Assembly through hole; 19. Receiving groove; 20. Clearance groove; 21. Limiting hook; 22. O-ring; 23. Lower guide slope; 24. Angled snap ring. Detailed Implementation

[0015] This worm gear with automatic meshing clearance adjustment function includes a housing 1, a worm wheel 2, and a worm 3 (see the instruction manual appendix). Figure 1 and 2 ).

[0016] The worm gear 2 is installed inside the housing 1 (see the instruction manual). Figure 3 A worm 3 is installed inside the housing 1 below the worm gear 2; the worm gear 2 and the worm 3 are meshed together (see the instruction manual appendix). Figure 3 ).

[0017] One end of the worm gear 3 is connected to the housing 1 via a large-angle clearance deep groove ball bearing 4 (see the instruction manual appendix). Figure 3 , 5 (and 6). When the worm 3 is under force, its axis can swing around the large-angle clearance deep groove ball bearing 4. The large-angle clearance deep groove ball bearing 4 has a relatively large angular clearance, which can meet the angle requirement for the axis of the worm 3 to swing around it.

[0018] The large-angle clearance deep groove ball bearing 4 has inclined snap rings 24 mounted on the worm gears 3 at both ends (see instruction manual appendix). Figure 6 The inclined snap ring 24 is used to clamp the end of the large-angle clearance deep groove ball bearing 4, which can both provide axial positioning and clamp the outer ring of the large-angle clearance deep groove ball bearing 4.

[0019] The housing 1 at the other end of the worm gear 3 contains a fixing seat 5 (see the instruction manual appendix). Figure 4 and 6 The fixing base 5 has a cylindrical structure; one end of the fixing base 5 is eccentrically provided with an anti-rotation positioning pin 9 (see the instruction manual appendix). Figure 9 and 12 During assembly, the anti-rotation positioning pin 9 of the fixed base 5 is inserted and connected to the housing 1 to restrict the rotation of the fixed base 5.

[0020] The other end face of the fixed base 5 is provided with a guide groove 10; the guide groove 10 has a "U" shaped structure. A spring station 13 is provided at the bottom of the guide groove 10 (see the instruction manual appendix). Figure 11 Limiting claws 11 are symmetrically arranged on the fixed seats 5 on both sides of the guide slide 10; an arc-shaped support plate 12 is provided at the lower end of the fixed seat 5 between the limiting claws 11.

[0021] An adjusting seat 7 is slidably mounted on the fixed seat 5 via a guide groove 10 (see instruction manual appendix). Figure 8 , 9 (and 10). The adjusting seat 7 has an elongated structure; the middle of the adjusting seat 7 is provided with an assembly through hole 18; the upper and lower parts of the adjusting seat 7 are provided with arc-shaped protrusions 17 (see the appendix of the instruction manual). Figure 15 and 16 During assembly, the small end bearing 8 is installed inside the adjusting seat 7 via the arc-shaped protrusion 17.

[0022] After the adjusting seat 7 is assembled inside the guide groove 10, the limiting claw 11 can limit the small end bearing 8 inside the adjusting seat 7, thus avoiding the problem of the small end bearing 8 slipping out.

[0023] The lower back of the adjusting seat 7 is provided with a receiving groove 19; a support spring 6 is provided inside the receiving groove 19 (see the instruction manual). Figure 14 and 16 The lower end of the support spring 6 is in contact with the arc-shaped support plate 12 of the fixed base 5. Under the elastic support of the support spring 6, the adjusting base 7 always has an upward tendency to move.

[0024] The side of the adjusting seat 7 is provided with a clearance groove 20; a limit hook 21 is provided on one side of the clearance groove 20; a lower guide slope 23 is provided at the lower end of the limit hook 21 (see the instruction manual appendix). Figure 15 and 17 ).

[0025] A vertical slide rail 14 is provided on one side of the guide slide groove 10 of the fixed base 5; an upper limit block 15 is provided on the side of the guide slide groove 10 on one side of the vertical slide rail 14; an upper guide slope 16 is provided on the upper limit block 15 (see the instruction manual appendix). Figure 11 and 13 ).

[0026] The purpose of arranging the fixed seat 5 and the adjusting seat 7 in this way is to enable the adjusting seat 7 to slide and connect with the vertical slide rail 14 of the fixed seat 5 through the clearance slot 20 during assembly. This achieves the purpose of controlling the movement trajectory of the adjusting seat 7 through the cooperation of the vertical slide rail 14 and the clearance slot 20, avoiding the problem of deviating from the movement trajectory. At the same time, during the process of the adjusting seat 7 being inserted into the interior of the fixed seat 5 along the guide slide groove 10, the limiting hook 21 first avoids and retracts under the guidance and compression of the lower guide slope 23 and the upper guide slope 16. When the limiting hook 21 slides completely down to below the upper limit block 15, the limiting hook 21 resets. Thus, when the adjusting seat 7 moves upward and the limiting hook 21 abuts against the upper limit block 15, the upper limit block 15 can limit the upward movement of the adjusting seat 7, thereby achieving the purpose of limiting the adjusting seat 7.

[0027] An adjusting seat 7 is movably mounted inside the fixed seat 5 via a support spring 6; the other end of the worm gear 3 is inserted into and connected to the small end bearing 8. An O-ring 22 is mounted on the circumferential surface of the worm gear 3 inside the small end bearing 8 via an assembly ring groove (see instruction manual appendix). Figure 6 The purpose of setting the O-ring 22 in this way is to position the O-ring 6 between the inner ring of the small end bearing 8 and the worm 3, thereby avoiding collision noise between the small end bearing 8 and the worm 3.

[0028] This worm gear with automatic meshing clearance adjustment function has a compact structure and ingenious design. It can provide support for one end of the worm 3 through the support spring 6, the adjusting seat 7 and the small end bearing 8. Under the action of the spring force, the worm 3 always tends to move closer to the worm wheel 2, thereby achieving the function of automatic meshing clearance adjustment. This solves the problems of poor sealing and increased meshing clearance that exist in existing worm gears after long-term use, and is particularly suitable for the needs of vehicle steering systems.

Claims

1. A worm gear reducer with automatic adjustment of meshing gap function, comprising a shell (1), a worm wheel (2) and a worm (3); the shell (1) is provided with the worm wheel (2); the shell (1) below the worm wheel (2) is provided with the worm (3); the worm wheel (2) is connected with the worm (3); characterized in that: One end of the worm (3) is connected to the housing (1) via a large-angle clearance deep groove ball bearing (4); a fixed seat (5) is installed inside the housing (1) at the other end of the worm (3); an adjusting seat (7) is movably installed inside the fixed seat (5) via a support spring (6); a small end bearing (8) is installed inside the adjusting seat (7); the other end of the worm (3) is inserted into the small end bearing (8) and connected to it; ​ The fixed seat (5) has a cylindrical structure; one end of the fixed seat (5) is eccentrically provided with an anti-rotation positioning pin (9); the other end face of the fixed seat (5) is provided with a guide groove (10); the fixed seats (5) on both sides of the guide groove (10) are symmetrically provided with limiting claws (11); the lower end of the fixed seat (5) between the limiting claws (11) is provided with an arc-shaped support plate (12). A vertical slide rail (14) is provided on one side of the guide slide (10); an upper limit block (15) is provided on the side of the guide slide (10) on one side of the vertical slide rail (14); an upper guide slope (16) is provided on the upper limit block (15). The adjusting seat (7) has a long strip structure; the upper and lower parts of the adjusting seat (7) are provided with arc-shaped protrusions (17); the middle part of the adjusting seat (7) is provided with an assembly through hole (18); the lower back of the adjusting seat (7) is provided with a receiving groove (19); a supporting spring (6) is provided in the receiving groove (19); the side of the adjusting seat (7) is provided with an avoidance groove (20); a limiting hook (21) is provided on one side of the avoidance groove (20); a lower guide slope (23) is provided at the lower end of the limiting hook (21).

2. A worm gear reducer with automatic meshing clearance adjustment function according to claim 1, characterized in that: The guide chute (10) has a "U" shaped structure; a spring station (13) is provided at the bottom of the guide chute (10).

3. A worm gear reducer with automatic adjustment of meshing clearance as described in claim 1, characterized in that: The worm (3) inside the small end bearing (8) is fitted with an O-ring (22) through an assembly ring groove on its circumferential surface.

Images