Steering gear with abrasion clearance self-adaptive adjustment function

Abstract

The invention relates to the field of steering gears, in particular to an abrasion clearance self-adaptive adjusting steering gear which comprises a shell, a rack, a gear, a steering wheel input shaft and two steering pull rods and further comprises a clutch assembly and a rotary positioning assembly. The rotary positioning assembly comprises an annular bevel gear and a main driving bevel gear, a limiting insertion strip is arranged on the inner wall of the annular bevel gear, a limiting sliding groove is formed in the outer wall of one end of the rack, and the number of tooth surfaces of the rack is two. A traditional single-tooth-surface rack is innovatively replaced by a double-tooth-surface replaceable structure, the service life of the steering gear is greatly prolonged, the strong spring and the rack are matched in a sliding coupling mode, the rack can be powerfully meshed with the rack all the time, the effect that work can be normally kept even if abrasion occurs is achieved, and the service life of the steering gear is prolonged. And through the disassembly-free structural design, a repairman can conveniently and rapidly carry out blind operation face changing operation of the rack, and the maintenance process is greatly simplified.

Description

Technical Field

[0001] The invention relates to the field of steering gears, in particular to a steering gear with adaptive wear clearance adjustment. Background Art

[0002] The function of the steering gear is to appropriately transform the steering torque and steering angle from the steering wheel (mainly to reduce speed and increase torque), and then output it to the steering rod mechanism to make the car turn. Therefore, the steering gear is essentially a reduction transmission device. There are many types of steering gears, such as rack and pinion type, recirculating ball type, worm crank pin type, power steering, etc.

[0003] The rack and pinion type is the most common steering gear. Its basic structure is a pair of meshing pinions and racks. When the steering shaft drives the pinion to rotate, the rack moves in a straight line, and the rack directly drives the tie rod to turn the steering wheel. The gear mainly bears periodic torsional force and contact stress when meshing with the rack. In addition to the contact stress from the gear, the rack may be subjected to some additional impact forces during the driving process of the vehicle due to its long length, such as steering system vibration caused by bumpy roads. Therefore, the rack is subjected to more complex stress conditions and is more prone to wear. Because the rack may be subjected to more complex external forces than the gear due to various road conditions and driving conditions during the operation of the vehicle, these external forces may aggravate the wear of the rack. With the increase of vehicle mileage, excessive wear of the rack will cause abnormal noise or even slipping of the steering gear. At this time, replacing a new steering gear assembly is a considerable cost and more time-consuming. Summary of the invention

[0004] Based on this, it is necessary to provide a steering gear with adaptive wear clearance adjustment to address the existing technical problems, so as to achieve a long service life of the steering gear and greatly improve the vehicle-using experience.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] A steering gear with adaptive wear clearance adjustment comprises a housing, a rack, a gear, a steering wheel input shaft and two steering tie rods, wherein the rack is movably arranged in the housing in a transverse direction, the gear is located in the middle of the inner side of the housing and meshes with the bottom of the rack, the two steering tie rods are respectively arranged at the two ends of the housing, one end of the two steering tie rods extends into the housing and is respectively connected to the two ends of the rack, one end of the steering wheel input shaft extends into the inner side of the housing and is coaxially fixed with the gear, the outer end of the steering wheel input shaft is transferred to the steering wheel through a universal joint, and further comprises a clutch assembly and a rotation positioning assembly, the clutch assembly comprises a clutch assembly for driving the lifting The lifting mechanism of the lowering rack and the sliding shaft connection mechanism for connecting the end of the rack and the steering rod, the rotation positioning assembly includes an annular bevel gear fixedly connected to the inner wall of one end of the shell and a main drive bevel gear fixedly connected to the side wall of the shell, the annular bevel gear is meshed with the main drive bevel gear, the annular bevel gear is sleeved on the outer side of the rack, a limiting insertion strip is arranged on the inner wall of the annular bevel gear, a limiting sliding groove for sliding the limiting insertion strip is opened on the outer wall of one end of the rack, the inner diameter of the annular bevel gear is larger than the shaft diameter of the rack, the number of tooth surfaces of the rack is two, and the two tooth surfaces are symmetrically arranged.

[0007] Furthermore, the sliding shaft connection mechanism includes a circular adapter plate and a bare rod bolt, the threaded section of the bare rod bolt is screwed to the end of the rack, the circular adapter plate is sleeved on the smooth axis section of the bare rod bolt, the bare rod bolt, the circular adapter plate and the rack are coaxially arranged, the circular adapter plate fits the end face of the rack, the diameter of the circular adapter plate is consistent with the diameter of the rack, a dovetail slide is formed on the side of the circular adapter plate away from the rack, the center planes of the dovetail slide and the circular adapter plate are flush, and the corresponding end of the steering rod is formed with a first dovetail slide groove for matching the dovetail slide.

[0008] Furthermore, the lifting mechanism includes a bracket, an adjusting bolt and a first flange end cover, a cylindrical accommodating cavity extending downward is formed at the middle bottom end of the shell, the first flange end cover is sealed and fixedly arranged at the bottom of the cylindrical accommodating cavity, the adjusting bolt is fixedly axially connected to the center of the first flange end cover, a first avoidance through hole for a wrench to enter is opened at the center of the first flange end cover, the bracket is cylindrical and a semicircular groove for slidingly lifting the rack is formed on the top, the bracket is slidably arranged in the cylindrical accommodating cavity in a vertical state, a threaded hole for matching the adjusting bolt is formed at the center of the bracket, a strip limit groove is formed on the cylindrical outer wall of the bracket, and a limit strip that slidably matches the strip limit groove is formed on the inner wall of the cylindrical accommodating cavity.

[0009] Furthermore, a first step groove is formed on the inner wall of one end of the shell, a first annular bearing is embedded in the step of the first step groove, a support ring extending outward and embedded in the inner ring of the first annular bearing is formed on the inner wall of one side of the annular bevel gear, a second flange end cover is provided at the end of the shell, a first limiting ring for pressing against the outer ring of the first annular bearing is formed on the inner side of the second flange end cover, a second annular bearing is embedded in the inner side of the first limiting ring, a second annular bearing is embedded in the inner ring of the second annular bearing, an end face of the second limiting ring is in sliding contact with the inner side wall of the second flange end cover, a length of the limiting groove along the axis direction of the rack is greater than the steering working stroke of the rack, and a radial length of the limiting strip is greater than the maximum gap value between the rack and the annular bevel gear.

[0010] Furthermore, a hexagonal anti-slip piece is threadedly screwed on the side wall at one end of the shell, one end of the hexagonal anti-slip piece extends to the inner side of the shell, the main drive bevel gear is rotatably arranged on the inner end of the hexagonal anti-slip piece, and a sleeve avoidance groove for installing the hexagonal anti-slip piece is formed on the outer wall of the shell, a second avoidance through hole for a wrench to penetrate is formed at the center of the outer side of the hexagonal anti-slip piece, and a hexagonal wrench hole is formed at one end at the center of the main drive bevel gear.

[0011] Furthermore, a stepped shaft-like portion located in the hexagonal anti-slipping piece is formed on the outer wall of the main driving bevel gear, a first sealing ring is arranged between the end of the stepped shaft-like portion and the bottom wall of the hexagonal anti-slipping piece, a first high-strength spring is arranged between the stepped shaft-like portion and the hexagonal anti-slipping piece, and two ends of the first high-strength spring are respectively pressed against the first sealing ring and the steps of the stepped shaft-like portion.

[0012] Furthermore, two angle locators evenly distributed in the circumferential direction are arranged between the rack and the inner wall of the shell, and the angle locator includes an embedded sliding mechanism and an embedded visual mechanism, the embedded sliding mechanism includes a dovetail slide slidably embedded on the outer wall of the rack and a push rod elastically arranged on the dovetail slide, a second dovetail slide groove for cooperating with the dovetail slide is formed on the outer wall of the rack, a cylindrical sink groove for accommodating the push rod is formed on the outer side of the dovetail slide, a return spring for outwardly resisting the push rod is arranged in the cylindrical sink groove, two annular baffles arranged at intervals are formed on the inner wall of the shell, the push rod is located between the two annular baffles, and the embedded visual mechanism includes an externally threaded tightening piece sealed and screwed on the side wall of the shell and an indicator movably arranged in the center hole of the externally threaded tightening piece. A short shaft, a second step groove for connecting an externally threaded fastener is formed on the side wall of the shell, a second sealing ring is arranged between the second step groove and the externally threaded fastener, two first O-rings for oil seals contacting the inner wall of the externally threaded fastener are embedded on the outer wall of the indicating short shaft, a limiting inner ring for preventing the indicating short shaft from falling outward is formed on the outer wall of one end of the indicating short shaft located on the inner side of the shell, a magnetic limiting outer ring for preventing the indicating short shaft from falling inward is formed on the outer wall of one end of the indicating short shaft located on the outer side of the shell, an annular magnet for adsorbing the magnetic limiting outer ring is embedded on the outer side of the externally threaded fastener, two positioning through holes for elastic embedding of a push rod are formed on the side wall of the shell, the indicating short shaft is located in the positioning through hole, and the positioning through hole is located between two annular baffles.

[0013] Furthermore, the bottom of the bracket is provided with a circular bottom cover separated from it, a second high-strength spring is provided between the circular bottom cover and the bottom of the bracket, the threaded hole is located at the center of the circular bottom cover, a receiving groove for accommodating the cap end of the adjusting bolt is formed at the inner center of the first flange end cover, a circular pressure plate for the adjusting bolt to pass through is embedded at the opening of the receiving groove, and two tightly fitting second O-rings are provided between the center hole of the circular pressure plate and the adjusting bolt.

[0014] Furthermore, a third O-ring is embedded on the outer wall of the main driving bevel gear, and the third O-ring is in oil-seal contact with the inner wall of the hexagonal anti-slip component.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, the present invention innovatively replaces the traditional single-tooth rack with a double-tooth replaceable structure, which greatly prolongs the service life of the steering gear;

[0017] Secondly, the invention uses a strong spring and a rack sliding shaft connection to ensure that the rack can always be strongly meshed with the rack, thereby achieving the effect of maintaining normal operation even if wear occurs;

[0018] Thirdly, the present invention can facilitate and quickly allow repairmen to carry out blind operation of rack face replacement through the design of the non-disassembly structure, thereby greatly simplifying the maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 It is a plan view schematic diagram of the present invention;

[0021] Figure 3 yes Figure 2 A schematic cross-sectional view along line AA;

[0022] Figure 4 yes Figure 2 The schematic cross-sectional view along line BB;

[0023] Figure 5 yes Figure 4 A magnified view of the structure at C in FIG.

[0024] Figure 6 yes Figure 4 A magnified view of the structure at D in FIG.

[0025] Figure 7 is a three-dimensional cross-sectional view of the present invention;

[0026] Figure 8 yes Figure 7 A schematic diagram of the structure at position E in FIG.

[0027] Fig. 9 It is a schematic diagram of the limit position principle of the rotational cooperation between the annular bevel gear and the rack;

[0028] The numbers in the figure are: 1, housing; 2, rack; 3, gear; 4, steering wheel input shaft; 5, steering tie rod; 6, annular bevel gear; 7, main drive bevel gear; 8, limit insert; 9, limit slide; 10, tooth surface; 11, circular adapter plate; 12, bare rod bolt; 13, dovetail slide; 14, first dovetail slide; 15, bracket; 16, adjustment bolt; 17, first flange end cover; 18, cylindrical accommodating cavity; 19, first avoidance through hole; 20, semicircular groove; 21, threaded hole; 22, strip limit groove; 23, limit strip; 24, first step sink groove; 25, first annular bearing; 26, support ring; 27, second flange end cover; 28, first limit ring; 29, second annular bearing; 30, second limit ring; 31. Hexagonal anti-slip part; 32. Sleeve avoidance groove; 33. Second avoidance through hole; 34. Hexagonal wrench hole; 35. Step shaft portion; 36. First sealing ring; 37. First high-strength spring; 38. Dovetail slide; 39. Second dovetail slide; 40. Push rod; 41. Cylindrical groove; 42. Reset spring; 43. Annular baffle; 44. External thread tightening part; 45. Indicating short shaft; 46. Second step groove; 47. Second sealing ring; 48. First O-ring; 49. Limit inner ring; 50. Magnetic limit outer ring; 51. Annular magnet; 52. Positioning through hole; 53. Circular bottom cover; 54. Second high-strength spring; 55. Accommodating groove; 56. Circular pressure plate; 57. Second O-ring; 58. Third O-ring. DETAILED DESCRIPTION

[0029] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Reference Figures 1 to 9As shown, a steering gear with adaptive wear clearance adjustment comprises a housing 1, a rack 2, a gear 3, a steering wheel input shaft 4 and two steering tie rods 5, wherein the rack 2 is laterally movable and arranged in the housing 1, the gear 3 is located in the middle position of the inner side of the housing 1 and meshes with the bottom of the rack 2, the two steering tie rods 5 are respectively arranged at the two ends of the housing 1, one end of the two steering tie rods 5 extends into the housing 1 and is respectively connected to the two ends of the rack 2, one end of the steering wheel input shaft 4 extends to the inner side of the housing 1 and is coaxially fixed with the gear 3, and the outer end of the steering wheel input shaft 4 is transferred to the steering wheel through a universal joint, and is characterized in that it also comprises a clutch assembly and a rotation positioning assembly, and the clutch assembly comprises a The lifting mechanism of the driving lifting rack 2 and the sliding shaft connection mechanism for connecting the end of the rack 2 and the steering rod 5, the rotation positioning assembly includes an annular bevel gear 6 fixedly connected to the inner wall of one end of the housing 1 and a main driving bevel gear 7 fixedly connected to the side wall of the housing 1, the annular bevel gear 6 is meshed with the main driving bevel gear 7, the annular bevel gear 6 is sleeved on the outer side of the rack 2, a limiting insertion strip 8 is arranged on the inner wall of the annular bevel gear 6, a limiting slide groove 9 for sliding insertion of the limiting insertion strip 8 is opened on the outer wall of one end of the rack 2, the inner diameter of the annular bevel gear 6 is larger than the shaft diameter of the rack 2, the number of tooth surfaces 10 of the rack 2 is two, and the two tooth surfaces 10 are symmetrically arranged.

[0031] In a conventional steering gear, the driver transmits a rotational torque to the gear 3 through the steering wheel input shaft 4. The rotation of the gear 3 drives the rack 2 to translate laterally in the housing 1. The lateral translation of the rack 2 drives the two steering tie rods 5 connected thereto. Finally, the translation of the two steering tie rods 5 pulls the horns of the front axle of the vehicle connected to the wheels to rotate, thereby realizing the steering process. The steering gear of the present invention achieves a double service life by improving the structure of the conventional steering gear. Specifically, when the tooth surface 10 on one side of the rack 2 is about to reach the end of its service life due to wear, the vehicle is lifted by a lift and then operated directly on the chassis. Specifically, the lifting mechanism of the clutch assembly is operated to lower the rack 2 for a certain distance so that it is aligned with the rack. The wheel 3 is released from the meshing state, and then the main driving bevel gear 7 is operated to drive the annular bevel gear 6 to rotate. The rotation of the annular bevel gear 6 and the sliding shaft connection mechanism drive the rack 2 to rotate. In this process, the rack 2 is rotated 180° under the action of the rotation positioning component. At this time, the new tooth surface 10 is facing the gear 3 again. Then the lifting mechanism is operated again to lift the rack 2 upward and reset it and contact the gear 3 again. At this time, another person slightly turns the steering wheel for fine adjustment until the gear 3 and the rack 2 are meshed (the meshing is in place when the worker at the bottom of the car sees the steering rod 5 move). At this point, the replacement of the new tooth surface 10 is completed, and finally the steering wheel offset angle is readjusted through the four-wheel alignment technology. The limit insert 8 on the inner wall of the annular bevel gear 6 cooperates with the limit slide 9 to drive the rack 2 to rotate on the one hand, and on the other hand, it is used to adaptively provide the displacement clearance of the rack 2 during the lifting process.

[0032] In order to ensure that the rack 2 can not only rotate to change planes, but also drive the steering rods 5 at both ends to move to achieve the steering function, the following features are specifically set:

[0033] The sliding shaft connection mechanism includes a circular adapter plate 11 and a bare rod bolt 12, the threaded section of the bare rod bolt 12 is screwed to the end of the rack 2, the circular adapter plate 11 is sleeved on the smooth axis section of the bare rod bolt 12, the bare rod bolt 12, the circular adapter plate 11 and the rack 2 are coaxially arranged, the circular adapter plate 11 is fitted to the end face of the rack 2, the diameter of the circular adapter plate 11 is consistent with the diameter of the rack 2, a dovetail slide 13 is formed on the side of the circular adapter plate 11 away from the rack 2, the center planes of the dovetail slide 13 and the circular adapter plate 11 are flush, and the corresponding end of the steering rod 5 is formed with a first dovetail slide groove 14 for matching the dovetail slide 13.

[0034] When the gear 3 rotates and drives the rack 2 to translate, the rack 2 pulls the first dovetail slide 14 on the steering rod 5 through the dovetail slide bars 13 on the circular adapter plates 11 at both ends, thereby achieving the effect of pulling the steering rod 5 to translate accordingly;

[0035] In order to achieve the purpose of manual clutch between rack 2 and gear 3, the following features are specifically set:

[0036] The lifting mechanism includes a bracket 15, an adjusting bolt 16 and a first flange end cover 17 (such as Figure 7 As shown), a cylindrical accommodating cavity 18 extending downward is formed at the middle bottom end of the shell 1, the first flange end cover 17 is sealed and fixedly arranged at the bottom of the cylindrical accommodating cavity 18, the adjusting bolt 16 is fixedly axially connected to the center of the first flange end cover 17, and a first avoidance through hole 19 for a wrench to enter is opened at the center of the first flange end cover 17, the bracket 15 is cylindrical and a semicircular groove 20 for slidingly lifting the rack 2 is formed on the top thereof, the bracket 15 is slidably arranged in the cylindrical accommodating cavity 18 in a vertical state, a threaded hole 21 for matching the adjusting bolt 16 is formed at the center of the bracket 15, a strip-shaped limiting groove 22 is formed on the cylindrical outer wall of the bracket 15, and a limiting strip 23 (combined with the limiting strip 23) that slidably matches the limiting groove 22 is formed on the inner wall of the cylindrical accommodating cavity 18. Figure 3 and Figure 7 ).

[0037] When the rack 2 and the gear 3 are to be separated, the adjusting bolt 16 is rotated by a wrench, and under the premise of the cooperation between the bar-shaped limiting groove 22 and the limiting bar 23, the rotation of the adjusting bolt 16 is converted into a downward movement process of the bracket 15, so that the rack 2 descends with the bracket 15 under the action of its own gravity, and then the rack 2 is separated from the gear 3;

[0038] When the rack 2 and the gear 3 are to be re-engaged, the adjusting bolt 16 is reversed by a wrench, so that the bracket 15 drives the rack 2 to lift upward until it encounters resistance and cannot be turned further. At this time, the wrench is removed, and the adjusting bolt 16 is reconnected through the wrench soft connecting rod (a mature tool that comes with the wrench and is not described here) and the wrench is rotated half a circle, thereby generating an upward elastic force on the rack 2 to press the gear 3 tightly. At this time, when another person fine-tunes the steering wheel, the gear 3 and the rack 2 will engage with each other during the elastic pressing process to achieve full engagement. The steering wheel angle offset generated in this process will be adjusted and reset by the subsequent four-wheel alignment.

[0039] In order to ensure that the annular bevel gear 6 can be fixedly axially arranged on the inner side of one end of the housing 1, the following features are specifically provided:

[0040] A first step groove 24 is formed on the inner wall of one end of the shell 1, and a first annular bearing 25 is embedded in the step of the first step groove 24. A support ring 26 extending outward and embedded in the inner ring of the first annular bearing 25 is formed on the inner wall of one side of the annular bevel gear 6. A second flange end cover 27 is provided at the end of the shell 1. A first limiting ring 28 for pressing against the outer ring of the first annular bearing 25 is formed on the inner side of the second flange end cover 27. A second annular bearing 29 is embedded on the inner side of the first limiting ring 28. A second limiting ring 30 is embedded in the inner ring of the second annular bearing 29. The end face of the second limiting ring 30 is in sliding contact with the inner side wall of the second flange end cover 27. The length of the limiting slide groove 9 along the axial direction of the rack 2 is greater than the steering working stroke of the rack 2, and the radial length of the limiting insert 8 is greater than the maximum gap value between the rack 2 and the annular bevel gear 6.

[0041] The first annular bearing 25 is coaxially arranged on the inner wall of one end of the housing 1, and the annular bevel gear 6 is embedded in the inner ring of the first annular bearing 25 through a support ring 26 extending outward from the inner hole, so that the annular bevel gear 6 is coaxially rotatably arranged on the inner side of one end of the housing 1, thereby ensuring that the annular bevel gear 6 and the main drive bevel gear 7 can be stably meshed throughout the entire process;

[0042] The outer ring and the inner ring of the first annular bearing 25 are respectively supported in reverse by the first limiting ring 28 and the second limiting ring 30, so that the forces on both sides of the first annular bearing 25 are balanced, thereby ensuring the service life of the first annular bearing 25;

[0043] The second annular bearing 29 is arranged between the first limiting ring 28 and the second limiting ring 30 to ensure that the two will not affect the normal operation of the first annular bearing 25 .

[0044] In order to realize the rotation and face-changing process of the rack 2 without disassembling the steering gear, the following features are specifically set:

[0045] A hexagonal anti-slipping piece 31 is threadedly connected to the side wall of one end of the housing 1, and one end of the hexagonal anti-slipping piece 31 extends to the inner side of the housing 1. The main driving bevel gear 7 is rotatably arranged on the inner end of the hexagonal anti-slipping piece 31 (such as Figure 6 As shown), a sleeve avoidance groove 32 for installing a hexagonal anti-slipping piece 31 is formed on the outer wall of the shell 1, a second avoidance through hole 33 for inserting a wrench is formed at the center of the outer side of the hexagonal anti-slipping piece 31, and a hexagonal wrench hole 34 is formed at one end of the center of the main drive bevel gear 7.

[0046] The main driving bevel gear 7 is rotated by operating the wrench, and the main driving bevel gear 7 drives the annular bevel gear 6 meshing therewith to rotate. The annular bevel gear 6 cooperates with the limiting slide groove 9 on the rack 2 through the limiting insert 8 on the inner wall to realize the synchronous rotation of the rack 2 with the annular bevel gear 6. In this process, since the rack 2 has been lowered in the previous operation, the rack 2 and the annular bevel gear 6 are not in a coaxial state during the rotation process. The displacement change between the axes of the two is automatically adapted through the cooperation of the limiting insert 8 and the limiting slide groove 9. At the same time, since the radial length of the limiting insert 8 is greater than the maximum gap value between the rack 2 and the annular bevel gear 6, the limiting insert 8 will not be separated from the limiting slide groove 9 during the whole process. At the same time, the limiting slide groove 9 is extended in the axial direction of the rack 2 to adapt to the lateral stroke generated during the normal translation of the rack 2.

[0047] In order to simplify the fine-tuning operation of the main drive gear 3 during the installation process and to facilitate the automatic meshing effect of the main drive gear 7 and the annular bevel gear 6, the following features are specifically set:

[0048] A stepped shaft portion 35 located in the hexagonal anti-slipping piece 31 is formed on the outer wall of the main driving bevel gear 7, a first sealing ring 36 is arranged between the end of the stepped shaft portion 35 and the bottom wall of the hexagonal anti-slipping piece 31, a first high-strength spring 37 is arranged between the stepped shaft portion 35 and the hexagonal anti-slipping piece 31, and the two ends of the first high-strength spring 37 are respectively pressed against the first sealing ring 36 and the steps of the stepped shaft portion 35.

[0049] After the main drive gear 7 is installed in the hexagonal anti-slip piece 31, it is directly screwed into the shell wall of the shell 1 until the hexagonal anti-slip piece 31 is pressed against the shell wall of the shell 1. At this time, the stepped shaft portion 35 is pressurized by the first high-strength spring 37, so that the main drive gear 7 always maintains an elastic tight contact with the annular bevel gear 6, so that in the future when the rack 2 is rotated and changed, the main drive gear 7 will automatically mesh with the annular bevel gear 6 or maintain a tight meshing connection.

[0050] In order to ensure that the repair worker can easily confirm the completion of the rack 2 face replacement operation without being able to visually see the internal situation of the steering gear, the following features are specifically set:

[0051] Two angle locators evenly distributed in the circumferential direction are arranged between the rack 2 and the inner wall of the shell 1, and the angle locator includes an embedded sliding mechanism and an external visual mechanism, the embedded sliding mechanism includes a dovetail slide 38 slidably embedded on the outer wall of the rack 2 and a push rod 40 elastically arranged on the dovetail slide 38, a second dovetail slide groove 39 for cooperating with the dovetail slide 38 is formed on the outer wall of the rack 2, a cylindrical sink groove 41 for accommodating the push rod 40 is formed on the outer side of the dovetail slide 38, and a return spring 42 for outwardly resisting the push rod 40 is arranged in the cylindrical sink groove 41, and two annular baffles 43 arranged at intervals are formed on the inner wall of the shell 1, and the push rod 40 is located between the two annular baffles 43, and the external visual mechanism includes an externally threaded tightening member 44 sealed and tightened on the side wall of the shell 1 and an indicating short shaft 45 movably arranged in the center hole of the externally threaded tightening member 44, and the shell A second step groove 46 for connecting to an externally threaded fastener 44 is formed on the side wall of the body 1, and a second sealing ring 47 is arranged between the second step groove 46 and the externally threaded fastener 44. Two first O-rings 48 for oil seals contacting the inner wall of the externally threaded fastener 44 are embedded on the outer wall of the indicating short shaft 45. A limiting inner ring 49 for preventing the indicating short shaft 45 from falling outward is formed on the outer wall of one end of the indicating short shaft 45 located on the inner side of the shell 1, and a magnetic limiting outer ring 50 for preventing the indicating short shaft 45 from falling inward is formed on the outer wall of one end of the indicating short shaft 45 located on the outer side of the shell 1. An annular magnet 51 for adsorbing the magnetic limiting outer ring 50 is embedded on the outer side of the externally threaded fastener 44. Two positioning through holes 52 for elastic embedding of the push rod 40 are formed on the side wall of the shell 1, and the indicating short shaft 45 is located in the positioning through hole 52, and the positioning through hole 52 is located between two annular baffles 43.

[0052] During the rotation of the rack 2, the dovetail slide 38 is driven to rotate via the second dovetail groove 39. During this process, the return spring 42 forces the push rod 40 to always be close to the inner wall of the shell 1. When the rack 2 rotates 180° and just completes the face change, the push rod 40 elastically embeds into the corresponding positioning through hole 52. At this time, the indicating short shaft 45 in the positioning through hole 52 will be forced to overcome the magnetic attraction of the annular magnet 51 and extend out of the external threaded tightening part 44. The worker can visually see that the indicating short shaft 45 protrudes from the external threaded tightening part 44, thereby reminding the worker that the rack 2 has rotated into place.

[0053] During the whole process, two spaced annular baffles 43 are used to axially limit the dovetail slide 38 in circular motion to prevent it from axially deviating and being unable to fit into the positioning through hole 52 on the opposite side. On the other hand, due to the axial limiting effect of the two annular baffles 43, during the normal translation of the rack 2, the push rod 40 and the dovetail slide 38 will not undergo axial displacement.

[0054] In order to further optimize the meshing operation process between the rack 2 and the gear 3 and provide a strong interaction force between the gear 3 and the rack 2 to ensure the normal connection between the two, the following features are specifically set:

[0055] The bottom of the bracket 15 is provided with a circular bottom cover 53 (such as Figure 7 A second high-strength spring 54 (as shown) is provided between the circular bottom cover 53 and the bottom of the bracket 15. Figure 3 As shown in the figure, the threaded hole 21 is located at the center of the circular bottom cover 53, and a receiving groove 55 for receiving the cap end of the adjusting bolt 16 is formed at the inner center of the first flange end cover 17, and a circular pressing plate 56 for the adjusting bolt 16 to pass through is embedded in the opening of the receiving groove 55, and two tightly fitting second O-rings 57 are provided between the center hole of the circular pressing plate 56 and the adjusting bolt 16.

[0056] After the tooth surface 10 of the rack 2 is replaced, the rack 2 is raised by a wrench. During this period, the steering wheel is fine-tuned and the wrench flexible connecting rod is used to make the gear 3 engage with the rack 2. During this process, the worker needs to use the wrench and the wrench flexible connecting rod to continuously apply a rotational force to the adjusting bolt 16, thereby indirectly applying an upward tightening force to the bracket 15. As an improved component, a circular bottom cover 53 connected to the adjusting bolt 16 can be separated from the bottom of the bracket 15. The circular bottom cover 53 is indirectly pressed upward against the bottom of the bracket 15 through the second high-strength spring 54. In this way, the worker only needs to tighten the adjusting bolt 16 into place. In the subsequent process of fine-tuning the steering wheel, the worker under the vehicle only needs to hold the outer end of the steering rod 5 with one hand (in the process of the rack 2 upwardly meshing with the gear 3, there may be a situation where the tooth tips of the two are in conflict. At this time, even if the two are not fully meshed, the rack 2 can be driven to translate through the rotation of the gear 3. Although this situation can also be re-engaged under the action of elastic force during the large rotation of the steering wheel after the vehicle lands, it is necessary to lift the vehicle again for four-wheel alignment adjustment at this time, which is a cumbersome process. Therefore, it is very necessary to adjust the gear 3 and the rack 2 to a fully meshed state before the vehicle lands). In this process, when the gear 3 is meshed with the rack 2, as the steering wheel rotates, the steering rod 5 will be forced to move, and it is judged to be meshed in place at this time.

[0057] In order to ensure the sealing effect between the main drive bevel gear 7 and the hexagonal anti-slip member 31 and prevent the leakage of lubricating oil, the following features are specifically set:

[0058] A third O-ring 58 is embedded on the outer wall of the main driving bevel gear 7, and the third O-ring 58 is in oil-sealed contact with the inner wall of the hexagonal anti-slip component 31, so that when the main driving bevel gear 7 undergoes a slight displacement under the action of elastic force, the presence of the third O-ring 58 and the oil seal ensures the sealing effect.

[0059] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A steering gear with wear clearance adaptive adjustment, comprising a housing (1), a rack (2), a gear (3), a steering wheel input shaft (4) and two steering tie rods (5), wherein the rack (2) is laterally movable and arranged in the housing (1), the gear (3) is located in the middle position of the inner side of the housing (1) and meshes with the bottom of the rack (2), the two steering tie rods (5) are respectively arranged at the two ends of the housing (1), one end of the two steering tie rods (5) extends into the housing (1) and is respectively connected to the two ends of the rack (2), one end of the steering wheel input shaft (4) extends into the inner side of the housing (1) and is coaxially fixedly connected with the gear (3), the outer end of the steering wheel input shaft (4) is transferred to the steering wheel through a universal joint, and is characterized in that: The invention also comprises a clutch assembly and a rotation positioning assembly, wherein the clutch assembly comprises a lifting mechanism for driving a lifting rack (2) and a sliding shaft connection mechanism for connecting the end of the rack (2) and a steering rod (5), wherein the rotation positioning assembly comprises an annular bevel gear (6) fixedly connected to the inner wall of one end of the housing (1) and a main driving bevel gear (7) fixedly connected to the side wall of the housing (1), wherein the annular bevel gear (6) meshes with the main driving bevel gear (7), wherein the annular bevel gear (6) is sleeved on the outer side of the rack (2), a limiting insertion strip (8) is arranged on the inner wall of the annular bevel gear (6), and a limiting sliding groove (9) for slidingly inserting the limiting insertion strip (8) is provided on the outer wall of one end of the rack (2), wherein the inner diameter of the annular bevel gear (6) is larger than the shaft diameter of the rack (2), and the number of tooth surfaces (10) of the rack (2) is two, and the two tooth surfaces (10) are symmetrically arranged.

2. A steering gear with adaptive wear clearance adjustment according to claim 1, characterized in that: The sliding shaft connection mechanism includes a circular adapter plate (11) and a bare rod bolt (12), the threaded section of the bare rod bolt (12) is screwed to the end of the rack (2), the circular adapter plate (11) is sleeved on the smooth axis section of the bare rod bolt (12), the bare rod bolt (12), the circular adapter plate (11) and the rack (2) are coaxially arranged, the circular adapter plate (11) is fitted to the end face of the rack (2), the diameter of the circular adapter plate (11) is consistent with the diameter of the rack (2), a dovetail slide (13) is formed on the side of the circular adapter plate (11) away from the rack (2), the center planes of the dovetail slide (13) and the circular adapter plate (11) are flush, and the corresponding end of the steering rod (5) is formed with a first dovetail slide groove (14) for matching the dovetail slide (13).

3. The steering gear with wear clearance adaptive adjustment according to claim 1, characterized in that: The lifting mechanism comprises a bracket (15), an adjusting bolt (16) and a first flange end cover (17); a cylindrical accommodating cavity (18) extending downward is formed at the middle bottom end of the shell (1); the first flange end cover (17) is sealed and fixedly arranged at the bottom of the cylindrical accommodating cavity (18); the adjusting bolt (16) is fixedly axially connected to the center of the first flange end cover (17); a first avoidance through hole (19) for a wrench to enter is opened at the center of the first flange end cover (17); the bracket (15) is cylindrical and has a semicircular groove (20) formed on its top for slidingly supporting the rack (2). The bracket (15) is slidably arranged in the cylindrical receiving cavity (18) in a vertical state. A threaded hole (21) for matching the adjusting bolt (16) is formed at the center of the bracket (15). A strip-shaped limiting groove (22) is formed on the cylindrical outer wall of the bracket (15). A limiting strip (23) that slidably matches the strip-shaped limiting groove (22) is formed on the inner wall of the cylindrical receiving cavity (18).

4. The steering gear with wear clearance adaptive adjustment according to claim 1, characterized in that: A first step groove (24) is formed on the inner wall of one end of the housing (1), a first annular bearing (25) is embedded in the step of the first step groove (24), a support ring (26) extending outward and embedded in the inner ring of the first annular bearing (25) is formed on the inner wall of one side of the annular bevel gear (6), a second flange end cover (27) is provided at the end of the housing (1), and a first limiting ring for pressing against the outer ring of the first annular bearing (25) is formed on the inner side of the second flange end cover (27). (28), a second annular bearing (29) is embedded on the inner side of the first limiting ring (28), a second limiting ring (30) is embedded in the inner ring of the second annular bearing (29), the end face of the second limiting ring (30) is in sliding contact with the inner wall of the second flange end cover (27), the length of the limiting slide groove (9) along the axis direction of the rack (2) is greater than the steering working stroke of the rack (2), and the radial length of the limiting insert (8) is greater than the maximum gap value between the rack (2) and the annular bevel gear (6).

5. The steering gear with wear clearance adaptive adjustment according to claim 1, characterized in that: A hexagonal anti-slipping piece (31) is screwed on a side wall at one end of the housing (1), one end of the hexagonal anti-slipping piece (31) extends to the inner side of the housing (1), the main drive bevel gear (7) is rotatably arranged on the inner end of the hexagonal anti-slipping piece (31), a sleeve avoidance groove (32) for installing the hexagonal anti-slipping piece (31) is formed on the outer wall of the housing (1), a second avoidance through hole (33) for a wrench to penetrate is formed at the center of the outer side of the hexagonal anti-slipping piece (31), and a hexagonal wrench hole (34) is formed at one end of the center of the main drive bevel gear (7).

6. A steering gear with adaptive wear clearance adjustment according to claim 5, characterized in that: A step shaft-shaped portion (35) located in the hexagonal anti-slipping piece (31) is formed on the outer wall of the main driving bevel gear (7); a first sealing ring (36) is arranged between the end of the step shaft-shaped portion (35) and the bottom wall of the hexagonal anti-slipping piece (31); a first high-strength spring (37) is arranged between the step shaft-shaped portion (35) and the hexagonal anti-slipping piece (31); two ends of the first high-strength spring (37) respectively press against the first sealing ring (36) and the step of the step shaft-shaped portion (35).

7. The steering gear with wear clearance adaptive adjustment according to claim 1, characterized in that: Two angle locators are arranged between the rack (2) and the inner wall of the housing (1) and are evenly distributed in the circumferential direction. The angle locators include an embedded sliding mechanism and an external visual mechanism. The embedded sliding mechanism includes a dovetail slide (38) slidably embedded on the outer wall of the rack (2) and a push rod (40) elastically arranged on the dovetail slide (38). A second dovetail slide groove (39) for matching the dovetail slide (38) is formed on the outer wall of the rack (2). The outer side of the dovetail slide (38) is formed with a A cylindrical recess (41) is provided for accommodating the ejector rod (40), a return spring (42) is provided in the cylindrical recess (41) for outwardly resisting the ejector rod (40), two annular baffles (43) are formed on the inner wall of the housing (1), the ejector rod (40) is located between the two annular baffles (43), the externally embedded visual mechanism comprises an externally threaded fastening member (44) sealed and screwed on the side wall of the housing (1) and an indicating short shaft (45) movably arranged in the center hole of the externally threaded fastening member (44), the housing ( A second step recess (46) for connecting with an external threaded fastener (44) is formed on the side wall of the housing (1); a second sealing ring (47) is arranged between the second step recess (46) and the external threaded fastener (44); two first O-rings (48) for oil sealing contacting the inner wall of the external threaded fastener (44) are embedded on the outer wall of the indicating short shaft (45); a limiting inner ring (49) for preventing the indicating short shaft (45) from falling out is formed on the outer wall of one end of the indicating short shaft (45) located on the inner side of the housing (1); and the indicating short shaft (45) is provided with a plurality of sealing rings (49) for preventing the indicating short shaft (45) from falling out. 5) A magnetic limit outer ring (50) is formed on the outer wall of one end outside the shell (1) for preventing it from falling inwards, and an annular magnet (51) is embedded on the outer side of the external threaded fastening member (44) for adsorbing the magnetic limit outer ring (50). Two positioning through holes (52) for elastic embedding of the push rod (40) are formed on the side wall of the shell (1), and the indicating short shaft (45) is located in the positioning through hole (52), and the positioning through hole (52) is located between the two annular baffles (43).

8. The steering gear with wear clearance adaptive adjustment according to claim 3, characterized in that: The bottom of the bracket (15) is provided with a circular bottom cover (53) separated from it, and a second high-strength spring (54) is provided between the circular bottom cover (53) and the bottom of the bracket (15). The threaded hole (21) is located at the center of the circular bottom cover (53). A receiving groove (55) for accommodating the cap end of the adjusting bolt (16) is formed at the inner center of the first flange end cover (17). A circular pressure plate (56) for the adjusting bolt (16) to pass through is embedded at the opening of the receiving groove (55), and two tightly fitting second O-rings (57) are provided between the center hole of the circular pressure plate (56) and the adjusting bolt (16).

9. The steering gear with wear clearance adaptive adjustment according to claim 6, characterized in that: A third O-ring (58) is embedded on the outer wall of the main driving bevel gear (7), and the third O-ring (58) is in oil-sealed contact with the inner wall of the hexagonal anti-slip component (31).

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