Electric recirculating ball steering gear structure easy to maintain

Abstract

The utility model discloses an electric recirculating ball steering gear structure easy to maintain, which comprises a recirculating ball shell, a steering lead screw and a steering rocker arm, the upper end of the steering lead screw penetrates from the lower end of the recirculating ball shell to the upper part of the recirculating ball shell, an upper angular contact bearing is arranged between the upper part of the recirculating ball shell and the recirculating ball shell, and a lower angular contact bearing is arranged between the lower part of the recirculating ball shell and the steering rocker arm. An oil seal is arranged on the outer side of the upper angular contact bearing, an adjusting nut is in threaded connection with a threaded hole formed in the lower end of the circulating ball shell, a lower angular contact bearing is arranged in the adjusting nut, the lower end of the steering lead screw is rotationally connected with the lower angular contact bearing, and the steering rocker arm is meshed with a steering nut of the steering lead screw. The device has the advantages of readjustment and quick maintenance and part replacement, is convenient to operate, and can be used for readjusting the pre-tightening force of the steering lead screw positioning angular contact bearing after the worm gear shell is assembled by arranging the adjusting nut structure at the tail part of the recirculating ball shell, so that the production maintainability of a production line is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric circulating ball steering gears, in particular to an electric circulating ball steering gear structure which is easy to maintain. Background Art

[0002] Under the general trend of EV and intelligent driving, commercial vehicles have a demand for EPS, which can solve the existing problems of traditional hydraulic power steering systems such as poor center feel, drifting at high speeds, and poor directionality, and support the expansion of advanced driving functions, such as LKA lane keeping, APA automatic parking, and unmanned driving.

[0003] The motor control unit is integrated into the recirculating ball mechanical steering gear to achieve power assistance. The steel balls, steering nuts and angular contact bearings in the steering screw pair of the pure mechanical recirculating ball steering gear are vulnerable parts. The lower end of the steering screw is conventionally installed in the bearing in the recirculating ball housing, and the steering screw is installed from the upper end of the recirculating ball housing, and then the upper part of the steering screw is firmly fixed. When disassembling, the worm gear housing and worm gear mechanism need to be removed before the steering screw can be taken out. Subsequent maintenance and disassembly are very difficult, and such a switchboard has no process for readjustment after assembly. In view of the above problems, an easy-to-maintain electric recirculating ball steering gear structure is proposed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide an easy-to-maintain electric recirculating ball steering gear structure with the advantages of readjustment and rapid maintenance and replacement of parts. It is easy to operate. An adjusting nut structure is arranged at the tail of the recirculating ball housing, so that the worm gear housing can be assembled and then the steering screw positioning angular contact bearing preload can be adjusted, thereby improving the maintainability of the production line. When the wearing parts, steel ball, steering nut and angular contact bearing are damaged, the tail adjusting nut assembly can be disassembled for maintenance, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an easily maintainable electric recirculating ball steering gear structure, comprising a recirculating ball housing, a steering screw and a steering rocker arm, wherein the upper end of the steering screw penetrates from the lower end of the recirculating ball housing and reaches the top of the recirculating ball housing, an upper angular contact bearing is arranged between the upper portion of the recirculating ball housing and the recirculating ball housing, an oil seal is arranged on the outer side of the upper angular contact bearing, an adjusting nut is threadedly connected to a threaded hole opened at the lower end of the recirculating ball housing, a lower angular contact bearing is arranged in the adjusting nut, the lower end of the steering screw is rotatably connected to the lower angular contact bearing, and the steering rocker arm is engaged with the steering nut of the steering screw.

[0006] Furthermore, it also includes a worm gear housing, which is fixedly connected to the upper end of the circulating ball housing. A worm gear is arranged in the worm gear housing, which is fixed to the upper end of the steering screw and is connected to the external motor controller through a worm.

[0007] Furthermore, a sealing ring is provided between the adjusting nut and the circulating ball housing, and a locking ring is provided on the adjusting nut.

[0008] Furthermore, a torsion bar is provided at the center of the upper end of the steering screw, and the steering screw is connected to the input shaft through the torsion bar.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] The utility model has the advantages of readjustment and rapid maintenance and replacement of parts, and is easy to operate. The adjusting nut structure is arranged at the tail of the circulating ball housing, so that the steering screw positioning angular contact bearing preload can be adjusted after the worm housing is assembled, thereby improving the maintainability of the production line. When the wearing parts of the steel ball, steering nut and angular contact bearing are damaged, the tail adjusting nut assembly can be disassembled for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the left side cross-sectional structure of the utility model.

[0013] In the figure: 1 oil seal, 2 upper angular contact bearing, 3 steering screw, 4 steering nut, 5 sealing ring, 6 lower angular contact bearing, 7 locking ring, 8 adjusting nut, 9 recirculating ball housing, 10 steering rocker arm, 11 worm gear, 12 worm gear housing, 13 input shaft, 14 torsion bar. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] See also Figure 1-2The utility model provides a technical solution: an easily maintainable electric recirculating ball steering gear structure, comprising a recirculating ball housing 9, a steering screw 3 and a steering rocker arm 10. The upper end of the steering screw 3 penetrates from the lower end of the recirculating ball housing 9 and passes through the top of the recirculating ball housing 9. A torsion bar 14 is provided at the center of the upper end of the steering screw 3. The torsion bar 14 is fixedly connected to the steering screw 3. The steering screw 3 is connected to an input shaft 13 through the torsion bar 14. An upper angular contact bearing 2 is provided between the upper part of the recirculating ball housing 9 and the recirculating ball housing 9. An oil seal 1 is provided on the outer side of the upper angular contact bearing 2. The oil seal 1 is provided to the recirculating ball housing 9. The upper end is sealed to prevent oil leakage. An adjusting nut 8 is threadedly connected to the threaded hole opened at the lower end of the circulating ball housing 9. A lower angular contact bearing 6 is installed in the adjusting nut 8. The lower end of the steering screw 3 is rotatably connected to the lower angular contact bearing 6. The lower part of the circulating ball housing 9 can be opened by adjusting the nut 8, and then the steering nut 4 is taken out from the bottom without removing the worm gear housing 12. The operation is convenient. The worm gear housing 12 can be assembled, and then the steering screw 3 is positioned and the angular contact bearing preload is adjusted to improve the maintainability of the production line. The steering rocker arm 10 is engaged with the steering nut 4 of the steering screw 3.

[0016] The worm gear housing 12 is fixedly connected to the upper end of the recirculating ball housing 9 . A worm gear 11 is provided in the worm gear housing 12 . The worm gear 11 is fixed to the upper end of the steering screw 3 . The worm gear 11 is connected to the outer motor controller through a worm.

[0017] A sealing ring 5 is provided between the adjusting nut 8 and the circulating ball housing 9. The sealing ring 5 seals the connection between the adjusting nut 8 and the circulating ball housing 9 to prevent oil leakage. A locking ring 7 is provided on the adjusting nut 8. The locking ring 7 locks the adjusting nut 8 to prevent self-rotation and ensure that the adjusting nut 8 is firmly fixed.

[0018] Arranging the section nut 8 structure at the tail of the recirculating ball housing 9 allows the steering screw 3 to be positioned and the angular contact bearing preload to be adjusted after the worm gear housing 12 is assembled, thereby improving the maintainability of the production line. In addition, when the aftermarket wearing parts, such as the steel ball, steering nut 4, and angular contact bearing, are damaged, the tail adjusting nut 8 can be disassembled and assembled for repair.

[0019] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An easily maintainable electric recirculating ball steering gear structure, comprising a recirculating ball housing (9), a steering screw (3) and a steering rocker arm (10), characterized in that: The upper end of the steering screw (3) penetrates from the lower end of the circulating ball housing (9) and passes to the top of the circulating ball housing (9). An upper angular contact bearing (2) is provided between the upper part of the circulating ball housing (9) and the circulating ball housing (9). An oil seal (1) is provided on the outer side of the upper angular contact bearing (2). An adjusting nut (8) is threadedly connected to the threaded hole opened at the lower end of the circulating ball housing (9). A lower angular contact bearing (6) is installed in the adjusting nut (8). The lower end of the steering screw (3) is rotatably connected to the lower angular contact bearing (6). The steering rocker arm (10) is engaged with the steering nut (4) of the steering screw (3).

2. The easily maintainable electric recirculating ball steering gear structure according to claim 1, characterized in that: The invention also includes a worm gear housing (12), which is fixedly connected to the upper end of the recirculating ball housing (9), and a worm gear (11) is provided in the worm gear housing (12). The worm gear (11) is fixed to the upper end of the steering screw (3), and the worm gear (11) is connected to the motor controller on the outside through a worm.

3. The easily maintainable electric recirculating ball steering gear structure according to claim 1, characterized in that: A sealing ring (5) is provided between the adjusting nut (8) and the circulating ball housing (9), and a locking ring (7) is provided on the adjusting nut (8).

4. The easily maintainable electric recirculating ball steering gear structure according to claim 1, characterized in that: A torsion bar (14) is provided at the center of the upper end of the steering screw (3), and the steering screw (3) is connected to the input shaft (13) via the torsion bar (14).

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