CN204459069U - Worm screw, worm gear worm backlash regulating mechanism, commutator and automobile - Google Patents

Abstract

A worm, a worm gear and worm meshing gap adjustment mechanism, a steering gear and an automobile, wherein the worm comprises: a rod portion, a first worm tooth fixed on the rod portion; a second tooth between adjacent first worm teeth; Worm teeth, and there is one and only one second worm tooth between adjacent first worm teeth, and the second worm tooth can move axially between adjacent first worm teeth along the rod; sleeved on the A sleeve at one end of the rod, the sleeve is fixedly connected to the second worm teeth; an adjustment mechanism capable of moving the sleeve axially along the rod; the first worm teeth and the second worm teeth are mutually Cooperate with the worm gear teeth on the worm gear after fitting. The utility model realizes the adjustment of the axial meshing gap of the worm gear and worm by adjusting the axial meshing gap of the worm gear and worm, and the two ends of the worm are connected with the housing by the first bearing and the second bearing, so that the worm gear can bear a larger load.

Description

Worm, worm gear and worm meshing gap adjustment mechanism, steering gear and automobile

technical field

The utility model relates to the technical field of worm gear transmission, in particular to a worm, a worm gear meshing gap adjustment mechanism, a steering gear and an automobile.

Background technique

The worm gear mechanism has been widely used in the mechanical field due to its compact structure, large transmission ratio, stable transmission, and small impact. However, due to the relatively high sliding speed between the worm gear and worm, it is easy to cause wear of the worm gear or worm. After the worm gear has been running for a period of time, the meshing gap between them will increase, and the transmission of the worm gear will be unstable at this time. Transmission ratio fluctuations and transmission noises occur, which eventually lead to failure of the worm gear, wherein the meshing gap between the worm gear includes an axial meshing gap and a radial meshing gap.

If the processing accuracy (such as the processing accuracy of the shell, worm gear, and worm) is not enough, it is easy to cause the normal transmission between the worm gear and the worm, such as axial or radial too tight meshing, at this time, it is more likely to cause transmission efficiency. Low, and the wear between the worm gear and the worm will also be accelerated; there may be too loose meshing in the axial or radial direction. invalidated. Therefore, the adjustment of the axial or radial meshing gap of worm gears and worms is a very important issue. In practice, most worm gears and worms cannot adjust the meshing gap between worms and worms, and only a small part of worm gears can adjust the diameter between worms and worms. to the meshing gap.

In order to make the transmission of the worm gear and worm mechanism stable, it is necessary to adjust the axial or radial meshing clearance of the worm gear and worm. In the prior art, the radial meshing clearance of the worm gear and worm is generally adjusted by adjusting the center distance of the worm gear and worm, as shown in Figure 1 Shown: It is mainly composed of housing 100, worm gear 200, worm gear shaft 300, self-aligning frame 400, bearing 500, worm 600, self-aligning top cone 700, self-aligning bearing 800 and other parts. Wherein the worm wheel shaft 300 passes through the central hole of the worm wheel 200, the worm wheel shaft 300 is fixedly connected with the worm wheel 200, the worm wheel shaft 300 is connected in the bearing housing hole on the housing 100 through a bearing (not shown in the figure), the left end of the worm 600 Through the inner ring of the self-aligning bearing 800, the outer ring of the self-aligning bearing 800 is fixed in the bearing seat hole on the housing 100, the right end of the worm 600 passes through the inner ring of the bearing 500, and the outer ring of the bearing 500 is embedded in the self-aligning In the waist-shaped groove in the frame 400 , the outer ring of the bearing can slide in the waist-shaped groove, and the end of the self-aligning cone 700 withstands the outer ring of the bearing 500 , and is threadedly engaged with the housing 100 .

The working principle is shown in Figure 2: When there is a large radial meshing gap between the worm wheel and the worm and the gap needs to be adjusted, the self-aligning top cone 700 is rotated to make it move upward, so that the bearing 500 also moves along the self-aligning frame. The waist-shaped groove in 400 moves upward, so that the worm 600 rotates counterclockwise around the self-aligning center "O" of the self-aligning bearing 800, the center distance between the worm 600 and the worm wheel 200 is also reduced, and the radial meshing gap is also reduced Until it disappears, this completes the adjustment of the radial meshing gap between the worm wheel 200 and the worm 600 .

However, there is no solution for axial clearance adjustment in the prior art.

The purpose of the utility model is to provide a mechanism for adjusting the meshing gap of the worm gear, which can adjust the axial meshing gap of the worm gear, so as to ensure the stable transmission of the worm gear and reduce the cost.

Utility model content

The problem solved by the utility model is that there is no solution for adjusting the axial meshing clearance in the prior art.

In order to solve the above problems, the utility model provides a worm, comprising:

a rod portion, the first worm gear fixed on the rod portion;

The second worm tooth is located between the adjacent first worm teeth, and there is only one second worm tooth between the adjacent first worm teeth, and the second worm tooth can be positioned between the adjacent first worm teeth along the rod. Axial movement between the teeth of the worm;

a sleeve sleeved on one end of the rod, the sleeve is fixedly connected to the second worm gear;

an adjustment mechanism capable of axially moving the sleeve along the stem;

The first worm gear teeth and the second worm gear teeth fit together with the worm gear teeth on the worm gear.

Optionally, a spline is provided between the second worm tooth and the rod, and the second worm tooth can axially move on the rod along the spline.

Optionally, one axial end of the adjustment mechanism is connected to the rod, and the other axial end is connected to the sleeve.

Optionally, the adjusting mechanism is a bolt, which is arranged on the axial end of the sleeve away from the first worm tooth, and the rod part has a bolt hole matched with the bolt, through which the bolt is screwed in or Unscrewing moves the sleeve axially along the shaft.

The utility model also provides a worm gear meshing gap adjustment mechanism, including:

A housing, the housing is provided with a first bearing hole and a second bearing hole, the first bearing hole is provided with a first bearing, and the second bearing hole is provided with a second bearing;

worm gear;

a worm as described in any one;

The worm gear meshes with the worm;

The two ends of the worm pass through the central holes of the first bearing and the second bearing respectively, one end of the worm is connected with the first bearing, and the sleeve at the other end of the worm can move along the second The center bore of the bearing moves axially.

Optionally, the housing is an electric power steering housing.

The utility model also provides a steering gear, including the meshing gap adjustment mechanism of any one of the worm gears and worms.

The utility model also provides an automobile, which includes the meshing gap adjustment mechanism of any one of the worm gears and worms.

Compared with the prior art, the technical solution of the utility model has the following advantages:

The rod of the utility model is provided with a first worm tooth, and a sleeve is sleeved at one end of the worm, and a second worm tooth is arranged between adjacent first worm teeth, and the second worm tooth can be positioned on the adjacent first worm along the rod. The axial movement between the worm teeth; when there is a large axial meshing gap between the worm wheel and the worm, the adjustment mechanism is unscrewed, and the sleeve moves outward, thereby driving the second worm tooth to move outward, and the first worm tooth is on the worm The shaft remains stationary, so that the worm teeth composed of the first worm teeth and the second worm teeth widen, and then the profile of the worm teeth expands outward, thereby eliminating the axial meshing gap between the worm teeth and the worm gear teeth, and reaching the worm gear The purpose of adjusting the axial meshing clearance of the worm.

Simultaneously, the worm gear of the present utility model is made of the first worm gear and the second worm gear, and the first worm gear and the second worm gear are mutually nested. The worm teeth formed by the worm teeth are meshed; this meshing method can not only adjust the axial meshing gap of the worm gear and worm, but at the same time, the worm gear is meshed through the first worm teeth, the second worm teeth and the worm gear teeth at any time. The first worm tooth, the second worm tooth and the worm gear teeth are all stressed, so the bearing capacity of the worm gear and the worm gear teeth becomes larger, the wear of the worm gear slows down, and the torque can be transmitted smoothly.

The meshing gap adjustment mechanism of the worm gear and worm of the utility model does not use self-aligning bearings, and does not adopt the method of adjusting the meshing center distance of the worm gear and worm to adjust the meshing gap, but realizes the adjustment of the axial meshing gap of the worm gear by adjusting the axial meshing gap of the worm gear and worm , and the two ends of the worm are connected to the casing by the first bearing and the second bearing, so that the worm gear can bear a larger load.

Description of drawings

Fig. 1 is a structural schematic diagram of a worm wheel radial meshing gap adjustment mechanism in the prior art;

Fig. 2 is a schematic diagram of the working principle of the prior art worm gear radial meshing gap adjustment mechanism;

Fig. 3 is a structural schematic diagram of the worm gear and worm axial meshing gap adjustment mechanism of the utility model;

Fig. 4 is the enlarged view of part B in Fig. 3 of the utility model;

Fig. 5 is an enlarged view of part C in Fig. 3 of the utility model;

Fig. 6 is a sectional view along the A-A direction in Fig. 3 of the present utility model.

Detailed ways

In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, specific embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 3 and Figure 4, the utility model provides a worm 600, comprising: a rod portion, on which a first worm tooth 602 is fixed, and a second worm tooth 603 is arranged between adjacent first worm teeth , a sleeve 606 is sleeved at one end of the worm 600, the sleeve 606 is fixedly connected with the second worm tooth 603, the second worm tooth 603 is located between the adjacent first worm teeth 602, the second worm tooth 603 can be The worm teeth 602 move axially, and there is only one second worm tooth 603 between the adjacent first worm teeth 602; the first worm teeth 602 and the second worm teeth 603 together constitute the worm teeth 601 of the worm of the present invention , the first worm gear 602 and the second worm gear 603 are attached to each other and meshed with the worm gear 201 on the worm gear 200 .

In addition, as shown in Figure 6, a spline 607 is provided between the second worm tooth 603 and the shaft, the second worm tooth 603 can move axially along the spline 607, and the spline 607 can transmit the shaft to the second worm The force of the tooth 603, because the spline 607 is provided on the rod, the second worm tooth 603 can move axially on the spline 607, so that the axial movement is smoother and the guidance is better, avoiding the second worm tooth 603 and The rods are in direct contact, resulting in wear and tear after long-term use, making the worm gear and worm meshing gap adjustment mechanism have a longer service life.

Further, as shown in FIG. 5 , it also includes an adjustment mechanism capable of moving the sleeve 606 axially along the rod. One end of the adjustment mechanism is connected to the rod, and the other end is connected to the sleeve 606. The adjustment mechanism includes The bolt 604 and the bolt hole 605 that matches the bolt 604 at the end of the rod, the bolt 604 is located at the axial end of the sleeve 606 away from the first worm tooth 602, and the inner circumference of the sleeve 606 is provided with a hole that matches the end of the cylinder head. Groove, the end of the cylindrical head of the bolt 604 is installed in the groove to achieve interference fit, the end of the cylindrical head of the bolt 604 is against the inner wall of the groove, and the bolt 604 is screwed in or out, because the end of the cylindrical head of the bolt 604 is in contact with the inner wall of the groove The inner wall of the groove on the inner peripheral surface of the sleeve 606 is offset, on the one hand, it plays the role of fixing the worm 600; The spline 607 moves axially along the shaft.

As shown in Figure 3, using the worm 600, the utility model also provides a worm gear meshing gap adjustment mechanism, including a housing 100, the housing 100 has a worm gear installation cavity and a worm screw installation cavity, and the worm gear installation cavity has Worm gear shaft 300, the worm gear shaft 300 passes through the central hole of the worm gear 200, the worm gear shaft 300 is connected with the worm gear 200; the worm 600 meshed with the worm gear 200 is installed in the worm installation cavity, wherein the first worm gear 602 and the second worm gear 603 are mutually After being fitted, it meshes with the worm gear teeth 201 on the worm gear 200; the first bearing hole and the second bearing hole are arranged in the installation cavity of the worm 600, and the first bearing 901 is arranged in the first bearing hole, and the second bearing hole is arranged in the second bearing hole. Two bearings 900; the two ends of the worm 600 pass through the central holes of the first bearing 901 and the second bearing 900 respectively; The center hole moves axially.

The housing 100 is an electric power steering housing.

The working principle of the worm gear and worm meshing clearance adjustment mechanism of this embodiment is as follows:

When there is a large axial meshing clearance between the worm gear teeth 201 and the worm teeth 601, the bolt 604 is unscrewed to move outward (the direction is the direction in which the second worm teeth 603 are away from the first worm teeth 602), thereby Drive the sleeve 606 to move outward, and then the sleeve 606 drives the second worm tooth 603 to move outward along the axial direction of the spline 607, and the first worm tooth 602 will not move axially along the spline 607, so that the first worm tooth 602 The worm tooth 601 formed together with the second worm tooth 603 becomes wider, and the profile of the worm tooth 601 expands outward, thereby eliminating the axial meshing gap between the worm tooth 601 and the worm gear tooth 201, and achieving the adjustment of the axial meshing gap of the worm gear Purpose.

When the axial meshing clearance of the worm gear and worm is small, the bolt 604 is screwed in to move it inward (this direction is the direction in which the second worm tooth 603 approaches the first worm tooth 602), thereby driving the sleeve 606 to move inward, Then the sleeve 606 drives the second worm tooth 603 to move axially inward along the spline 607, and the first worm tooth 602 will not move axially along the spline 607, so that the first worm tooth 602 and the second worm tooth 603 together form a The worm teeth 601 are narrowed, and the profile of the worm teeth 601 is reduced, thereby eliminating the axial meshing clearance between the worm teeth 601 and the worm gear teeth 201, and achieving the purpose of adjusting the axial meshing clearance of the worm gear.

Simultaneously, the worm gear 601 of the utility model is made up of the first worm gear 602 and the second worm gear 603, and the first worm gear 602 and the second worm gear 603 are mutually nested. A worm tooth 602 and a worm tooth 601 formed by a second worm tooth 603 are meshed; such an meshing method can not only adjust the axial meshing clearance of the worm gear and worm, but at the same time, at any time, the worm gear is passed through the first worm tooth 602, the second Two worm teeth 603 are engaged with worm gear teeth 201 (referring to Fig. 4), and in the process of worm gear meshing, the first worm gear teeth 602, the second worm gear teeth 603 and the worm gear teeth 201 are all stressed, so, the worm gear teeth 601 and the worm gear teeth The bearing capacity of the teeth 201 becomes larger, the wear of the worm gear slows down, and the torque can be transmitted smoothly.

The meshing gap adjustment mechanism of the worm gear and worm of the utility model does not use self-aligning bearings, and does not adopt the method of adjusting the meshing center distance of the worm gear and worm to adjust the radial meshing gap, but realizes the axial meshing gap of the worm gear and worm by adjusting the axial meshing distance of the worm gear and worm. Adjustment, and the two ends of the worm are connected with the casing by the first bearing and the second bearing, so that the worm gear can bear a larger load.

It should be noted that the adjustment mechanism of the present invention is not limited to bolts, as long as the sleeve can drive the second worm tooth to move between adjacent first worm teeth along the rod, such a mechanism is applicable to the present invention.

In addition, since the spline 607 is provided between the second worm tooth 603 and the shaft, the second worm tooth 603 can move more smoothly and stably on the shaft; Smooth and more stable movement, the parts set between the second worm tooth 603 and the rod are not limited to the spline 607; meanwhile, there may not be any parts between the second worm tooth 603 and the rod, the second worm The tooth 603 is likewise movable axially on the shaft.

The utility model also provides a steering gear, which includes the meshing gap adjustment mechanism of the worm gear and worm.

The utility model also provides an automobile, which includes the worm gear and worm meshing gap adjustment mechanism.

Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, so the protection scope of the present utility model should be based on the scope defined in the claims.

Claims (8)

1. a worm screw, is characterized in that, comprising:

Bar portion, is fixedly arranged on the first worm tooth in described bar portion;

The second worm tooth between adjacent first worm tooth, and have between adjacent first worm tooth and only have second worm tooth, described second worm tooth can move axially between adjacent first worm tooth along described bar portion;

Be sheathed on the sleeve of one end, described bar portion, described sleeve is fixedly connected with described second worm tooth;

The controlling mechanism that described sleeve moves axially along described bar portion can be made;

Described first worm tooth and described second worm tooth bonded to each other after coordinate with the worm-gear tooth on worm gear.

2. worm screw as claimed in claim 1, it is characterized in that, be provided with spline between described second worm tooth and described bar portion, described second worm tooth can move axially in described bar portion along spline.

3. worm screw as claimed in claim 1, is characterized in that, the axial one end of described controlling mechanism is connected with described bar portion, the axial the other end and described sleeve connection.

4. worm screw as claimed in claim 3, it is characterized in that, described controlling mechanism is bolt, be located at the axial end portion of described sleeve away from described first worm tooth, described bar portion has the bolt hole coordinated with described bolt, by the screw-in of described bolt or back-out, described sleeve is moved axially along described bar portion.

5. a worm gear worm backlash regulating mechanism, is characterized in that, comprising:

Housing, described housing is provided with clutch shaft bearing hole, the second bearing hole, is provided with clutch shaft bearing in described clutch shaft bearing hole, is provided with the second bearing in described second bearing hole;

Worm gear;

Worm screw described in any one of claim 1-4;

Described worm gear and described worm meshing;

The two ends of described worm screw are each passed through the center hole of described clutch shaft bearing and described second bearing, and described worm screw one end is connected with described clutch shaft bearing, and the sleeve of the described worm screw the other end can move axially along the center hole of described second bearing.

6. worm gear worm backlash regulating mechanism as claimed in claim 5, it is characterized in that, described housing is electric booster steering device housing.

7. a commutator, is characterized in that, comprises the worm gear worm backlash regulating mechanism described in any one of claim 5-6.

8. an automobile, is characterized in that, comprises the worm gear worm backlash regulating mechanism described in any one of claim 5-6.