阅读说明：本技术 一种转向器的定位导向机构 (Positioning and guiding mechanism of steering gear ) 是由 黄福良 张新中 康雨辰 陈丽 魏悦 宋金行 王桐 于 2019-11-20 设计创作，主要内容包括：本发明提供一种转向器的定位导向机构,包括齿轮、齿轮保护套、齿条、齿条定位导向组件和转向横拉杆；齿轮啮合齿条,齿轮保护套可罩住齿轮和齿条,齿条的顶部加工有一排啮齿,齿条的底部沿轴向设有定位槽；齿条定位导向组件位于齿条的底部,齿轮保护套上设有用于容纳齿条定位导向组件的安装腔,齿条定位导向组件包括承托块和压缩弹簧,承托块的顶部为与齿条的直径匹配的弧形槽,承托块上设有与定位槽匹配的定位轨,定位轨嵌入定位槽内；压缩弹簧向上挤压承托块,使齿条的啮齿紧密啮合齿轮；转向横拉杆通过拉杆球头连接齿条。本发明对齿条进行可靠地定位和导向,以提高驾驶舒适性和齿条齿轮的使用寿命。(The invention provides a positioning and guiding mechanism of a steering gear, which comprises a gear, a gear protective sleeve, a rack positioning and guiding assembly and a steering tie rod, wherein the gear is arranged on the rack; the gear is meshed with the rack, the gear protective sleeve can cover the gear and the rack, a row of meshed teeth are processed at the top of the rack, and a positioning groove is axially formed at the bottom of the rack; the rack positioning guide assembly is positioned at the bottom of the rack, the gear protective sleeve is provided with an installation cavity for accommodating the rack positioning guide assembly, the rack positioning guide assembly comprises a bearing block and a compression spring, the top of the bearing block is an arc-shaped groove matched with the diameter of the rack, the bearing block is provided with a positioning rail matched with the positioning groove, and the positioning rail is embedded into the positioning groove; the compression spring upwards extrudes the bearing block to enable the tooth teeth of the rack to be tightly meshed with the gear; the steering tie rod is connected with the rack through a tie rod ball head. The invention reliably positions and guides the rack so as to improve the driving comfort and prolong the service life of the rack and the gear.)

1. A positioning and guiding mechanism of a steering gear is characterized by comprising a gear, a gear protective sleeve, a rack positioning and guiding assembly and a steering tie rod; the gear is meshed with the rack, the gear protective sleeve can cover the gear and the rack, the rack is a circular column, a row of meshed teeth are machined at the top of the rack, and a linear positioning groove is axially formed in the bottom of the rack; the rack positioning and guiding assembly is positioned at the bottom of the rack, and the gear protective sleeve is provided with an installation cavity for accommodating the rack positioning and guiding assembly; the rack positioning guide assembly comprises a bearing block and a compression spring, the top of the bearing block is of an arc-shaped groove structure matched with the diameter of the rack, the bearing block is provided with a positioning rail matched with the positioning groove, and the positioning rail is embedded into the positioning groove; the compression spring is positioned below the bearing block and presses the bearing block upwards to enable the tooth teeth of the rack to be meshed with the gear; the steering tie rod is connected with the rack through a tie rod ball head.

2. The positioning guide mechanism of a steering gear according to claim 1, wherein the rack includes an engaging portion and a stopper portion, the engaging tooth being located at the engaging portion, the stopper portion having a height greater than a height of the engaging portion; the length of the positioning groove is matched with that of the meshing part.

3. The steering gear positioning guide mechanism according to claim 2, wherein the positioning rail is located at the top center of the support block.

4. The positioning and guiding mechanism of a steering gear according to claim 2, wherein the rack positioning and guiding assembly further comprises an adjusting bolt and a pressing block, wherein the pressing block is located below the compression spring; the gear protection sleeve is provided with a threaded hole, and the adjusting bolt can be screwed into the threaded hole to press the pressing block, so that the pressing block presses the compression spring.

5. The positioning and guiding mechanism of a steering gear according to claim 4, wherein a plurality of auxiliary springs are further installed between the bottom of the pressing block and the bottom of the installation cavity, and the auxiliary springs can press the pressing block upwards.

6. The steering gear positioning guide mechanism according to claim 5, wherein a plurality of the assist springs are symmetrically distributed centering on the adjusting bolt.

7. The steering positioning and guiding mechanism according to claim 1, wherein the surface of the bearing block is covered with a layer of wear-resistant rubber gasket.

Technical Field

The invention belongs to the technical field of steering gears, and particularly relates to a positioning guide mechanism of a steering gear.

Background

The rack and pinion steering gear of the vehicle transfers steering torque by meshing of the gear and the rack, and the gear and the rack have certain fit clearance so as to ensure that the rack can be stably meshed with the gear and the rack can smoothly reciprocate. When a vehicle runs on a bumpy road, the rack can slightly shake or radially rotate due to the existence of a fit clearance, so that the problem of unsmooth fit between the gear and the rack is caused, and the driving comfort and the service life of the rack gear are influenced.

Disclosure of Invention

The invention aims to provide a positioning and guiding mechanism of a steering gear, which can reliably position and guide a rack so as to improve the driving comfort and prolong the service life of a rack gear.

The invention provides the following technical scheme:

a positioning guide mechanism of a steering gear comprises a gear, a gear protective sleeve, a rack positioning guide assembly and a steering tie rod; the gear is meshed with the rack, the gear protective sleeve can cover the gear and the rack, the rack is a circular column, a row of meshed teeth are machined at the top of the rack, and a linear positioning groove is axially formed in the bottom of the rack; the rack positioning and guiding assembly is positioned at the bottom of the rack, an installation cavity for accommodating the rack positioning and guiding assembly is arranged on the gear protective sleeve, the rack positioning and guiding assembly comprises a bearing block and a compression spring, the top of the bearing block is of an arc-shaped groove structure matched with the diameter of the rack, a positioning rail matched with the positioning groove is arranged on the bearing block, and the positioning rail is embedded into the positioning groove; the compression spring is positioned below the bearing block and presses the bearing block upwards to enable the tooth teeth of the rack to flexibly engage with the gear; the steering tie rod is connected with the rack through a tie rod ball head.

Preferably, the rack comprises an engaging part and a limiting part, the engaging part is located on the engaging part, and the height of the limiting part is greater than or equal to that of the engaging part; the length of the positioning groove is matched with that of the meshing part.

Preferably, the positioning rail is located at the top center of the bearing block.

Preferably, the rack positioning and guiding assembly further comprises an adjusting bolt and a pressing block, and the pressing block is located below the compression spring; the gear protection sleeve is provided with a threaded hole, and the adjusting bolt can be screwed into the threaded hole to press the pressing block, so that the pressing block presses the compression spring.

Preferably, a plurality of auxiliary springs are further installed between the bottom of the pressing block and the bottom of the installation cavity, and the auxiliary springs can upwards press the pressing block.

Preferably, the plurality of auxiliary springs are symmetrically distributed around the adjusting bolt.

Preferably, the surface of the bearing block is covered with a layer of wear-resistant rubber gasket.

The invention has the beneficial effects that: according to the invention, the rack positioning guide mechanism is arranged at the bottom of the rack, and the positioning groove and the positioning rail which are matched with each other are arranged on the rack and the bearing block of the rack positioning guide mechanism, so that the rack can strictly move linearly along the positioning rail when a vehicle turns, and the rack can not radially rotate or jump even under the driving condition of frequent vibration, therefore, the tooth of the rack can not violently collide with the gear, the meshing stability of the rack and the gear and the service life of the rack and the gear are ensured, and the driving comfort is improved. Meanwhile, a compression spring of the rack positioning and guiding mechanism upwards extrudes the bearing block, so that the rack can be flexibly attached to the gear when moving, and the meshing reliability and the moving smoothness of the rack are ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the mounting structure of the present invention;

FIG. 2 is an enlarged front view of the portion A in FIG. 1;

FIG. 3 is a schematic view of the mating structure of the bearing block and the rack of the present invention;

labeled as: 1. a gear; 2. a gear protective sleeve; 3. a rack; 4. a tie rod; 5. an engaging portion; 6. a limiting part; 7. a sleeve; 8. positioning a groove; 9. a mounting cavity; 10. a bearing block; 11. a compression spring; 12. positioning the rail; 13. a wear-resistant rubber gasket; 14. a ball head; 15. adjusting the bolt; 16. briquetting; 17. an auxiliary spring.

Detailed Description

As shown in fig. 1, a positioning and guiding mechanism of a steering gear comprises a gear 1, a gear protecting sleeve 2, a rack 3, a rack positioning and guiding assembly and a tie rod 4. The gear 1 is connected with a steering wheel through a steering shaft, and the gear 1 is meshed with the rack 3. The whole circular post that is of rack 3, rack 3 include meshing portion 5 and spacing portion 6, and the processing has one row of rodent on the tooth portion 5 of nibbling, and spacing portion 6 is level and smooth cylindric structure, and spacing portion 6 is for meshing portion 5 upwards protrusion, and spacing portion 6 is used for carrying out physics spacing to gear 1's rotation. The gear protection sleeve 2 can cover the meshing part of the gear 1 and the rack 3, the sleeve 7 is sleeved outside the rack 3, the gear protection sleeve 2 is fixedly connected with the end part of the sleeve 7, and the rack 3 can translate in the sleeve 7 and the gear protection sleeve 2. The center of the bottom of the rack 3 is provided with a linear positioning groove 8 along the axial direction.

As shown in fig. 1 to 3, rack location direction subassembly is located the bottom of rack 3, and be located the just right position with gear 1, be equipped with the installation cavity 9 that is used for holding rack location direction subassembly on the gear protective sheath 2, rack location direction subassembly includes bearing block 10 and compression spring 11, the arc wall structure that the top of bearing block 10 is matchd with the diameter of rack 3, the top central authorities of bearing block 10 are fixed with a location rail 12 that matches with constant head tank 8, in location rail 12 embedding constant head tank 8, rack 3 can be along rectilinear movement when making to turn to, can not rotate or rock.

The length of constant head tank 8 and the length phase-match of meshing portion 5, constant head tank 8 can further carry out spacingly to the rotation stroke of gear.

As shown in fig. 3, a wear-resistant rubber pad 13 is fixed to the surface of the bearing block 10 by screws to reduce wear and frictional noise between the rack 3 and the bearing block 10.

As shown in fig. 2, the compression spring 11 is located below the bearing block 10, and the compression spring 11 presses the bearing block 10 upwards to make the tooth of the rack 3 flexibly and closely contact with the gear 1 all the time, so as to ensure the transmission effect of the gear steering force and the smoothness of the rack movement. The tie rod 4 is connected to the rack 3 via a tie rod ball 14.

The rack positioning and guiding assembly further comprises an adjusting bolt 15 and a pressing block 16, and the pressing block 16 is located below the compression spring 11; the installation cavity of the gear protection sleeve 2 is provided with a threaded hole, the adjusting bolt 15 can be screwed into the threaded hole to press the pressing block 16, so that the pressing block 16 presses the compression spring 11, and gaskets with different thicknesses can be correspondingly filled between the adjusting bolt 15 and the gear protection sleeve 2 to ensure the tightness of the adjusting bolt 15. By changing the screwing-in depth of the adjusting bolt 15 and the jacking pressure of the bearing block 10 on the rack 3, the rack 3 and the gear 1 can be stably meshed, and the rack is not blocked due to too tight matching.

Still install a plurality of auxiliary spring 17 between the bottom of briquetting 16 and the bottom of installation cavity 9, a plurality of auxiliary spring 17 use adjusting bolt 15 to distribute as central symmetry, and auxiliary spring 17 can assist compression spring 11 roof pressure briquetting 16, can also keep the equilibrium of briquetting 16, prevents the 16 deflections of briquetting, and then has guaranteed the stability that bearing piece 10 supported rack 3.

The working process of the invention is as follows: the adjusting bolt 15 is screwed to adjust the fit clearance between the rack 3 and the gear 1 to a proper size, so that the rack and the gear can be reliably meshed and the rack can smoothly move. When the steering wheel is turned, the steering wheel drives the gear 1 to rotate, the gear 1 drives the rack 3 to translate leftwards or rightwards, when the rack 3 translates, the positioning groove 8 at the bottom of the rack moves linearly along the positioning rail 12 of the bearing block 10, the rack cannot shake or rotate radially, and the rack 3 and the gear 1 are smoothly matched; meanwhile, the bearing block 10 presses the rack 3, so that the rack 3 and the gear 1 are always in a stable meshing state.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.