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CN-224211127-U - Steering gear and nut

CN224211127UCN 224211127 UCN224211127 UCN 224211127UCN-224211127-U

Abstract

The application provides a steering gear and a nut, the steering gear comprises a rotating rod, the nut and an output shaft, the nut is sleeved on the rotating rod and can be driven by the rotation of the rotating rod to move along the axial direction, a straight-tooth rack is arranged on the nut along the axial direction, a matched straight-tooth matched with the straight-tooth rack is arranged on the circumferential direction of the output shaft, the module of the tooth of the straight-tooth rack is gradually reduced from the tooth top to the tooth root, the steering gear realizes the adjustment of the rotation ratio between the nut and the output shaft under different steering conditions by the variable module design of the tooth on the nut, the adaptation of steering torque to different steering conditions is realized by the change of the mechanical structure, the stability and the accuracy of the steering of a vehicle are improved, the cost is lower, and the application is convenient.

Inventors

  • WU KAIDONG
  • ZHANG RUI
  • LI BO
  • ZHOU JIANSHUAI
  • Xu Mengci

Assignees

  • 博世汽车转向系统（济南）有限公司

Dates

Publication Date
20260508
Application Date
20250509

Claims (13)

  1. 1. The utility model provides a steering engine, its characterized in that, steering engine includes dwang, nut and output shaft, the nut suit is in on the dwang and can be driven through the rotation of dwang to along axial direction motion be provided with the straight-tooth rack on the nut along axial direction be provided with in the circumference direction of output shaft with straight-tooth rack complex pair straight-tooth, the straight-tooth rack sets up, and the modulus of its tooth reduces gradually from the top to the root.
  2. 2. The steering engine according to claim 1, wherein the paired spur teeth and spur tooth racks are arranged such that a pressure angle between the single paired spur tooth and the spur tooth rack gradually increases from a fully engaged state to a disengaged state.
  3. 3. The steering engine according to claim 1, further comprising a housing on which the output shaft is supported by at least one housing cover, the housing cover being provided in an annular structure through which the output shaft can pass, an inner ring of the annular structure being provided eccentrically to an outer ring.
  4. 4. A steering gear according to claim 3, wherein the inner and outer rings have an eccentricity of 0.5 to 1.5 mm.
  5. 5. A steering gear according to claim 3, wherein an adjustment aperture is provided in a face of the annular structure facing away from the housing.
  6. 6. Steering gear according to claim 1, characterized in that the turning bar is provided as a screw, that a spiral groove for receiving a ball is provided on the nut, and that the nut and the screw are brought into relative movement by means of the ball.
  7. 7. Steering gear according to claim 6, characterized in that a return is provided between the nut and the screw, on which return ball return channels are provided arranged side by side, each of which ball return channels is connected to one of the spiral grooves of the nut for the internal circulation of the ball screw.
  8. 8. The steering machine of claim 7, wherein the ball return passage includes a raceway section, a transition section, and a ball return section connected in sequence, the raceway section being connected to the spiral groove of the nut, the raceway section, the transition section, and the ball return section increasing in depth in the return in sequence, the ball return section having a depth equal to or greater than the diameter of the balls.
  9. 9. The steering gear according to claim 1, further comprising an input shaft, a sensor, a controller, a driving mechanism, and a transmission mechanism, the input shaft being arranged coaxially with the turning lever by a torsion spring, an input end of the transmission mechanism being connected to the driving mechanism, an output end being connected to the turning lever, The sensor collects the angle deviation of the input shaft and the rotating rod and transmits corresponding sensor signals to the controller, and the controller controls the driving mechanism to drive the rotating rod to rotate through the transmission mechanism and further drives the output shaft to rotate through the transmission of the nut.
  10. 10. The steering gear according to claim 9, wherein the drive mechanism is provided as a motor, the transmission mechanism is provided as a worm gear, the worm is coaxially connected to an output shaft of the motor, and the worm wheel is coaxially connected to the turning lever.
  11. 11. The nut is used for being sleeved on a rotating rod of a steering engine and can be driven by rotation of the rotating rod to move along the axial direction, a straight-tooth rack is arranged on the nut along the axial direction and is used for being matched with a matched straight tooth arranged on an output shaft of the steering engine, so that power transmission is realized, and the straight-tooth rack is arranged in such a way that the modulus of teeth of the straight-tooth rack gradually decreases from a tooth top to a tooth root.
  12. 12. Nut according to claim 11, characterized in that a spiral groove for receiving a ball is provided on the inner ring of the nut, by means of which the nut is brought into relative movement with the rotating rod provided as a screw.
  13. 13. Nut according to claim 12, characterized in that a mounting groove for mounting a return is provided on the inner ring of the nut.

Description

Steering gear and nut Technical Field The application relates to the technical field of vehicle steering, in particular to a steering gear and a nut. Background Steering machines are important devices for steering vehicles, especially large vehicles, and output motor drive torque to an output shaft, especially through a motor drive transmission, to achieve output of steering torque. In the known steering gear, the drive is driven by means of a gear between the drive and the output shaft, and in the circumferential direction of the output shaft a bevel gear is generally arranged which is matched to the drive, the drive ratio between the drive and the output shaft remaining constant in different steering situations. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of utility model According to various aspects, one of the technical problems to be solved by the application is how to adjust the transmission ratio of the mechanical mechanism of the steering gear to different steering situations. In addition, the application aims to solve or alleviate other technical problems in the prior art. According to an aspect of the present application, there is provided: The steering engine comprises a rotating rod, a nut and an output shaft, wherein the nut is sleeved on the rotating rod and can be driven by rotation of the rotating rod to move along the axial direction, a straight-tooth rack is arranged on the nut along the axial direction, paired straight teeth matched with the straight-tooth rack are arranged on the output shaft in the circumferential direction, and the modulus of the teeth of the straight-tooth rack is gradually reduced from the tooth top to the tooth root. According to another aspect of the present application, there is provided a nut for being fitted over a turning rod of a steering gear and being driven by rotation of the turning rod to move in an axial direction, a spur rack being provided on the nut in the axial direction for cooperation with a mating spur tooth provided on an output shaft of the steering gear to thereby achieve power transmission, the spur rack being provided such that a modulus of teeth thereof gradually decreases from a tooth top to a tooth bottom. The beneficial points of the application include at least one of the following: 1. According to the steering machine in one embodiment of the application, the teeth of the straight-tooth rack on the nut are subjected to variable modulus design, and the matched straight teeth on the output shaft are also set to have different pressure angles with the straight-tooth rack at different contact positions, so that different transmission ratios between the nut and the output shaft under the condition of different steering angles of the steering wheel are realized by changing the mechanical structure, the matching steering torque which is matched with different steering conditions is more accurately output, and the steering accuracy and stability of the vehicle are improved; 2. The shell cover of the steering gear in one embodiment of the application is arranged in an eccentric structure, and the free clearance of the output shaft can be adjusted by rotating the shell cover, so that the transmission ratio between the output shaft and the nut can be manually adjusted to a certain extent; 3. The ball screw of the steering gear in one embodiment of the application adopts an internal circulation structure to guide the movement of the balls, avoids adopting a half-pipe structure positioned outside the nut, prevents the half-pipe structure from cracking due to overlarge external force, and can realize that the balls pass through the ball return channel more smoothly. Drawings The above and other features of the present application will become apparent with reference to the accompanying drawings, in which, Fig. 1 shows a schematic view of the overall structure of a steering engine according to an embodiment of the present application; FIG. 2 shows a cross-sectional view of a proposed steering engine at the engagement of a spur rack of a nut with mating spur teeth of an output shaft, according to one embodiment of the present application; fig. 3 shows a schematic structural view of a housing cover of a steering gear according to an embodiment of the present application; Fig. 4 shows a schematic structural view of a ball screw of a steering gear according to an embodiment of the present application; fig. 5 shows a schematic structural view of a return of a steering gear according to an embodiment of the present application. Detailed Description It is to be understood that, according to the technical solution of the present application, those skilled in the art may propose various alternative structural