Automatic compensation structure for worm gear and worm gap wear

Abstract

The utility model discloses a kind of worm gear gap wear automatic compensation structures, including the base (3) of being sleeved in worm wheel (1) and worm (2) outside, the seat body (4) of being sleeved in the end of worm (2) is equipped in the base (3), the compensation mechanism includes the push rod (5) being arranged in the side of seat body (4), the push rod (5) penetrates seat body (4), one end of the push rod (5) in seat body (4) is located in the side of push rod (5), one end of the push rod (5) outside seat body (4) is equipped with propelling element;When worm wheel (1) worm (2) between wear, propelling element promotes push rod (5) to move, push rod (5) promotes worm (2) to close to worm wheel (1) direction, realize gap compensation, so that worm wheel (1) worm (2) is always in no gap fit state, prevent abnormal sound state, significantly improve the quality level of product.

Description

Technical Field

[0001] This utility model belongs to the field of worm gear technology. Specifically, this utility model relates to an automatic compensation structure for worm gear clearance wear. Background Technology

[0002] In worm gear drives, the worm is made of metal and the worm wheel is made of nylon. After long-term use, wear will occur, and the clearance between the worm and worm will increase, resulting in abnormal noise during the reversal process.

[0003] A patent application (patent number 202221524958.7, published on March 7, 2023) discloses an automatic compensation mechanism for worm gear wear in an EPS reducer. The mechanism includes an external reducer housing. A worm gear is installed at the lower part of the reducer housing, meshing with a worm above it. A left-end bearing and a right-end bearing are fixed to the left and right ends of the worm, respectively. A compensation mechanism is fixedly connected to the left-end bearing. The compensation mechanism consists of an adjusting sleeve, a push block, a spring, an O-ring, a buffer ring, and a pressure cap. The adjusting sleeve is installed on the left side inside the reducer housing, with an O-ring and a buffer ring fixed on it. The left-end bearing is installed inside the adjusting sleeve. The push block is installed above the left-end bearing and connected to one end of the spring. The other end of the spring abuts against the pressure cap. This invention features a simple structure, high integration, and strong implementability. By utilizing the outer O-ring buffer of the adjusting component and the inner push block clearance compensation method, it ensures stable operation of the worm gear and has a positive effect on improving EPS torque fluctuations.

[0004] In existing technologies, a spring mechanism is usually added to the small end of the worm. The spring can push the worm to move towards the worm wheel. Although the spring can push the worm to move towards the slider, the spring force is relatively small (if it is too large, the no-load torque will become very large). During the back-and-forth reversal process, the worm wheel will bounce the worm away, generating noise. The existing structure can only play the role of restoring the worm after it bounces away, and cannot achieve the effect of backlash compensation. Utility Model Content

[0005] The present invention aims to provide an automatic compensation structure for worm gear backlash and wear that can achieve the effect of backlash compensation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an automatic compensation structure for worm gear backlash wear, comprising a base fitted outside the worm gear and worm, a seat body fitted inside the base and attached to the end of the worm, and a compensation mechanism comprising a push rod disposed on the side of the seat body, the push rod penetrating the seat body, one end of the push rod inside the seat body being located on the side of the push rod, and a propulsion member disposed on the other end of the push rod outside the seat body.

[0007] The push rod has an arc-shaped slider at one end inside the base.

[0008] The housing contains a bearing fitted onto the outside of the worm gear, and the slider is attached to the bearing surface.

[0009] The propulsion component is divided into a lower cam connected to the push rod and an upper cam that cooperates with the lower cam, and a torsion spring is provided between the lower cam and the upper cam.

[0010] The lower cam has an arc-shaped groove on the side near the upper cam, and the upper cam has a groove with the same slope on the side near the lower cam.

[0011] The inclined grooves are multiple and are distributed in a circular pattern on the surfaces of the upper and lower cams, with adjacent inclined grooves arranged in a wavy, stepped pattern.

[0012] The upper cam has a bolt mounted on the base on the side away from the lower cam.

[0013] The seat is bow-shaped.

[0014] The surface of the slider is provided with an elastic block.

[0015] The technical effect of this utility model is as follows: when wear occurs between the worm gear and the worm, the pusher pushes the push rod to move, and the push rod pushes the worm to move closer to the worm gear, thereby achieving clearance compensation. This ensures that the worm gear and the worm are always in a clearance-free fit, preventing abnormal noise and significantly improving the quality level of the product. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 This is a schematic diagram of an automatic compensation structure for worm gear clearance wear according to the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of a propulsion component with an automatic compensation structure for worm gear backlash and wear.

[0019] The markings in the diagram are: 1. Worm gear; 2. Worm; 3. Base; 4. Seat; 5. Push rod; 6. Slider; 7. Bearing; 8. Upper cam; 9. Lower cam; 10. Torsion spring; 11. Inclined groove; 12. Bolt; 13. Elastic block. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution, and to facilitate its implementation.

[0021] Please see Figure 1-2 An automatic compensation structure for worm gear backlash wear includes a base 3 fitted around a worm gear 1 and a worm 2. A seat 4, fitted onto the end of the worm 2, is located within the base 3. The compensation mechanism includes a push rod 5 disposed on the side of the seat 4, penetrating the seat 4. One end of the push rod 5 inside the seat 4 is located on its side, and the other end outside the seat 4 has a pusher component. The base 3 is mounted on other equipment to fix the worm gear 1 and the worm 2. The rotation of the worm 2 drives the rotation of the worm gear 1. Because the worm gear 1 and the worm 2 are in a meshing state for a long time, the wear between the worm gear 1 and the worm 2 is compensated. The lubricating oil may decrease. When the amount of lubricating oil between the worm gear 1 and the worm 2 decreases, causing wear between the worm 2 and the worm gear 1, the clearance between the worm gear 1 and the worm 2 increases. Since the pusher always maintains a thrust towards the worm gear 1, the pusher can push the push rod 5 to move. The push rod 5 pushes the worm 2 closer to the worm gear 1, realizing clearance compensation. This ensures that the worm gear 1 and the worm 2 are always in a clearance-free fit, preventing abnormal noise and significantly improving the quality level of the product. The seat 4 has a hole for the worm 2 to be inserted, and the diameter of the hole is larger than the diameter of the end of the worm 2.

[0022] The push rod 5 has an arc-shaped slider 6 at one end inside the base 4; the arc-shaped slider 6 is more adaptable to the shape of the object being pushed, and the arc shape of the slider 6 can prevent the slider 6 from slipping and falling off.

[0023] The base 4 contains a bearing 7 fitted onto the outer side of the worm gear 2, and a slider 6 is attached to the surface of the bearing 7. The bearing 7 facilitates the normal use of the worm gear 2, reduces friction during rotation, and extends the service life of the worm gear 2. It also prevents direct contact between the slider 6 and the worm gear 2, thus avoiding friction between them. The slider 6 pushes the bearing 7 to move it. The base 4 has a slot for storing the slider 6. The slider 6 is in close contact with the outer surface of the outer ring of the bearing 7. Since the outer ring of the bearing 7 does not rotate, there is no friction between the slider 6 and the bearing 7, which reduces wear. The arc-shaped slider 6 increases the contact area with the bearing 7 and keeps it in close contact with the surface of the bearing 7, preventing slippage when the slider 6 pushes the bearing 7 to move.

[0024] The propulsion component is divided into a lower cam 9 connected to the push rod 5 and an upper cam 8 that cooperates with the lower cam 9. A torsion spring 10 is provided between the lower cam 9 and the upper cam 8. The torsion spring 10 is always kept in a torsional state. Therefore, when a gap appears between the worm gear 1 and the worm 2, the worm 2 can be pushed to move towards the worm gear 1. At this time, the torsion spring 10 is no longer restricted and can begin to release. The torsion spring 10 drives the lower cam 9 to rotate relative to the upper cam 8, thereby causing the lower cam 9 to move away from the upper cam 8, thus achieving the effect of pushing the push rod 5 and the worm 2 to move.

[0025] The lower cam 9 has an arc-shaped inclined groove 11 on the side near the upper cam 8, and the upper cam 8 has an inclined groove 11 with the same inclination on the side near the lower cam 9. Through the inclined groove 11 that fits between the upper cam 8 and the lower cam 9, when the upper cam 8 and the lower cam 9 rotate relative to each other, the inclined grooves 11 on both sides will move relative to each other, so that the inclined grooves 11 on both sides will move to the higher point, thereby separating the upper cam 8 and the lower cam 9 from each other, so that the lower cam 9 can move away from the upper cam 8, thereby pushing the push rod 5 to move. And because the inclination of the inclined grooves 11 on both sides is the same, the fit between the upper cam 8 and the lower cam 9 is more stable and there will be no tilting. The wobbling between the upper cam 8 and the lower cam 9 will be very small.

[0026] There are multiple inclined grooves 11, which are distributed in a circular pattern on the surfaces of the upper cam 8 and the lower cam 9. Adjacent inclined grooves 11 are distributed in a wave-like stepped pattern. Because there are multiple inclined grooves 11, the stability of the support can be improved, and the relative tilting between the upper cam 8 and the lower cam 9 can be avoided, thus preventing the structure from breaking due to tilting. Furthermore, the wave-like stepped pattern of the inclined grooves 11 can prevent reverse rotation.

[0027] The upper cam 8 is provided with a bolt 12 on the base 3 on the side away from the lower cam 9; the bolt 12 is fixed on the base 3, thereby fixing the upper cam 8 and preventing the torsion spring 10 from driving the upper cam 8 to rotate, so as to ensure that the torsion spring 10 can drive the lower cam 9 to rotate.

[0028] The seat 4 is bow-shaped; the base 3 has a groove that matches the seat 4, which can prevent the seat 4 from being rotated and causing the push rod 5 to be twisted and broken.

[0029] The surface of the slider 6 is provided with an elastic block 13; after the worm wheel 1 absorbs water or expands at high temperature, it can absorb part of the phase change and prevent the worm wheel 1 and worm 2 from becoming too tight and stuck after expansion.

[0030] Working principle: The worm gear 1 and worm 2 mesh with each other. The rotation of worm 2 drives the rotation of turbine 1. When wear occurs between worm 2 and worm gear 1, the gap between worm 2 and worm gear 1 increases. At this time, the torsion spring 10, which has been in a torsional state, begins to reset. Since the upper cam 8 is fixed to the base 3 by bolt 12, the upper cam 8 will not rotate. The lower cam 9 begins to rotate under the action of the torsion spring 12. The inclined groove 11 on the surface of the lower cam 9 begins to move along the inclined groove 11 on the surface of the upper cam 8, so that the lower cam 9 begins to move away from the upper cam 8. The lower cam pushes the push rod 5 to move towards the worm gear 1. The push rod 5 has a slider 6 at one end inside the seat 4. The slider 6 is in close contact with the surface of the bearing 7. There is a gap between the bearing 7 and the inner wall of the seat 4, which pushes the bearing 7 to move. The end of the worm 2 is set on the surface of the bearing 7, which pushes the worm 2 to move towards the worm gear 1, so that the gap between the worm 2 and the turbine 1 can be reduced and a close contact effect can be achieved.

[0031] The technical effect of this utility model is as follows: when wear occurs between the worm wheel 1 and the worm 2, the propulsion component pushes the push rod 5 to move, and the push rod 5 pushes the worm 2 to move closer to the worm wheel 1, thereby achieving clearance compensation. This ensures that the worm wheel 1 and the worm 2 are always in a clearance-free fit, preventing abnormal noise and significantly improving the quality level of the product.

[0032] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An automatic compensation structure for worm gear backlash wear, comprising a base (3) fitted over the worm gear (1) and worm (2), characterized in that: The base (3) is provided with a seat (4) sleeved on the end of the worm (2). The compensation mechanism includes a push rod (5) disposed on the side of the seat (4). The push rod (5) passes through the seat (4). One end of the push rod (5) inside the seat (4) is located on the side of the push rod (5), and the other end of the push rod (5) outside the seat (4) is provided with a propulsion component.

2. The automatic compensation structure for worm gear backlash wear according to claim 1, characterized in that: The push rod (5) has an arc-shaped slider (6) at one end inside the base (4).

3. The automatic compensation structure for worm gear backlash wear according to claim 2, characterized in that: The seat (4) is provided with a bearing (7) fitted on the outside of the worm (2), and the slider (6) is attached to the surface of the bearing (7).

4. The automatic compensation structure for worm gear backlash wear according to claim 1, characterized in that: The pusher is divided into a lower cam (9) connected to the push rod (5) and an upper cam (8) that cooperates with the lower cam (9). A torsion spring (10) is provided between the lower cam (9) and the upper cam (8).

5. The automatic compensation structure for worm gear backlash wear according to claim 4, characterized in that: The lower cam (9) has an arc-shaped groove (11) on the side near the upper cam (8), and the upper cam (8) has a groove (11) with the same slope on the side near the lower cam (9).

6. The automatic compensation structure for worm gear backlash wear according to claim 5, characterized in that: The inclined grooves (11) are multiple and are distributed in a circular pattern on the surfaces of the upper cam (8) and the lower cam (9). Adjacent inclined grooves (11) are distributed in a wave-like stepped pattern.

7. The automatic compensation structure for worm gear backlash wear according to claim 4, characterized in that: The upper cam (8) is provided with a bolt (12) mounted on the base (3) on the side away from the lower cam (9).

8. The automatic compensation structure for worm gear backlash wear according to claim 1, characterized in that: The seat (4) is bow-shaped.

9. The automatic compensation structure for worm gear backlash wear according to claim 2, characterized in that: The surface of the slider (6) is provided with an elastic block (13).

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