Commercial vehicle electric mechanical recirculating ball steering gear with two-stage speed reducing mechanism

Abstract

The utility model discloses a commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reducing mechanism, which comprises a worm and gear reducing mechanism and a ball screw pair which are arranged in a steering gear shell, and a transition connecting shaft, a planetary gear reducing mechanism and a driving motor are sequentially arranged at one end of a worm on the steering gear shell along the axial direction of the worm; the planetary gear speed reducing mechanism comprises a sun gear shaft, a plurality of planetary gear shafts are arranged in the circumferential direction of the sun gear shaft, an outer gear ring is arranged on the inner wall of a planetary gear speed reducer shell, a transmission disc is connected between rotating shafts of the planetary gear shafts, and a transmission shaft coaxially connected with the transition connecting shaft is arranged on the transmission disc. A rotating shaft of the sun gear shaft is fixedly connected with a rotating shaft of the driving motor through a first coupler, and the transition connecting shaft is fixedly connected with the worm through a second coupler. According to the utility model, heavy-load output of the steering gear can be realized; manufacturing cost is low, whole vehicle arrangement is facilitated, and the steering gear is convenient to maintain, disassemble and assemble; and the steering gear works stably and reliably.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile steering gears, in particular to an electric mechanical circulating ball steering gear for commercial vehicles with a two-stage reduction mechanism. Background Art

[0002] With the general trend of intelligent driving, commercial vehicles have a demand for EPS. Electric power steering can solve the existing problems of large free clearance, high-speed drift, and large residual angle of return in traditional hydraulic power steering systems, while supporting the expansion of advanced driving functions such as LKA (lane keeping), automatic parking, and unmanned driving. If commercial vehicles want to achieve the above functions, EPS systems are a must. It is possible to integrate a motor control unit into an electric mechanical recirculating ball steering gear to achieve power assistance, but the requirements for product output loads of commercial vehicles are gradually increasing. In order to achieve large load output, it is necessary to increase the reduction ratio or increase the rated torque of the motor; Patent announcement number CN206938848U discloses a recirculating ball pure electric power steering gear, which specifically discloses that a worm gear mechanism and a recirculating ball steering mechanism are installed in a shell, the output end of the worm gear mechanism is connected to the input end of the recirculating ball steering mechanism, and the worm gear mechanism is driven by a motor to achieve the purpose of reducing weight and increasing torque. As the requirements for product output loads of commercial vehicles are gradually increasing, there are steering gears that still cannot meet the large load output. In order to achieve large load output, increasing the reduction ratio or increasing the rated torque of the motor is not convenient for modifying the existing steering gear, the manufacturing cost is high, and it is not conducive to the layout of the entire vehicle. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism. A planetary gear reduction mechanism with a first-stage reduction and torque-increasing effect is added to the existing steering gear structure, so that a large load output of the steering gear can be achieved; at the same time, no major modification is made to the original steering gear structure, which is convenient for transforming the existing steering gear, reducing the manufacturing cost of the steering gear, and facilitating the layout of the entire vehicle. The coaxiality and connection strength between the various housings of the steering gear are high, which is convenient for the maintenance and disassembly of the steering gear; the planetary gear reduction mechanism has good stability when transmitting power, and the steering gear works stably and reliably; the problems in the background technology can be effectively solved.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism, comprising a worm gear reduction mechanism and a ball screw pair arranged in a steering gear housing, the worm gear reduction mechanism comprising an input shaft rotatably connected in the steering gear housing, a worm wheel being arranged on the input shaft, and a worm gear cooperating with the worm wheel being rotatably connected in the steering gear housing; a transition housing 1, a planetary gear reduction housing, a transition housing 2 and a motor housing are sequentially arranged along the axial direction of the worm gear on one end of the steering gear housing, and a transition connecting shaft, a planetary gear reduction mechanism and a driving motor are respectively arranged in the transition housing 1, the planetary gear reduction housing and the motor housing along the axial direction of the worm gear; the planetary gear reduction mechanism comprises a sun gear shaft coaxially arranged with the driving motor shaft, and the sun gear A plurality of planetary gear shafts meshing with each other are provided in the circumferential direction of the shaft, and an outer gear ring meshing with the planetary gear shafts is also provided on the circumferential inner wall of the planetary gear reducer housing, the rotating shafts of the planetary gear shafts all face the worm, and a transmission plate is connected between the rotating shafts of the planetary gear shafts, and the transmission plate is provided with a transmission shaft coaxially connected with the transition connecting shaft; the rotating shaft of the sun gear shaft is fixedly connected to the rotating shaft of the driving motor through a coupling 1, and the coupling 1 is located in a transition housing 2, and the transition connecting shaft is fixedly connected to the worm through a coupling 2; the ball screw pair includes an output shaft rotatably connected in the steering gear housing, a steering gear fixedly connected to the output shaft, a screw portion is provided on the input shaft, and a screw nut is rollingly connected to the screw portion, the screw nut is provided with meshing teeth meshing with the steering gear, and a rocker arm is fixedly provided at one end of the output shaft.

[0005] Furthermore, a slewing bearing is provided on the circumferential inner wall of the planetary gear reducer housing, and the transmission plate is rotatably connected in the planetary gear reducer housing through the slewing bearing; a balancing cam is provided at one end of the sun gear shaft facing the transmission plate, and the balancing cam is coaxially arranged with the transmission plate and rotatably connected thereto.

[0006] Furthermore, a top screw hole 1 is provided on the circumferential outer wall of the sleeve portion of the coupling 1 that is connected to the sun gear shaft, and the sun gear shaft is fixedly connected to the coupling 1 by passing the sleeve top screw A through the top screw hole 1; a receiving hole matching the transmission shaft is provided on the end face of the transition connection shaft terminal, a top screw hole 2 is provided on the circumferential outer wall of the end of the transition connection shaft, and the transmission shaft is fixedly connected to the transition connection shaft by passing the sleeve top screw B through the top screw hole 2.

[0007] Furthermore, the axial front end faces of the transition housing 1, the planetary gear reducer housing, the transition housing 2 and the motor housing are all provided with an outer convex ring; the outer convex ring of the transition housing 1 is matched with the inner hole clearance of the steering gear housing at the worm position, the outer convex ring of the planetary gear reducer housing is matched with the inner hole clearance of the end of the transition housing 1, the outer convex ring of the transition housing 2 is matched with the inner hole clearance of the end of the planetary gear reducer housing, the outer convex ring of the motor housing is matched with the inner hole clearance of the end of the transition housing 2, and the steering gear housing, the transition housing 1, the planetary gear reducer housing, the transition housing 2 and the motor housing are fixedly connected to each other by connecting bolts.

[0008] Compared with the prior art, the beneficial effects of the utility model are as follows: the commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism adds a planetary gear reduction mechanism between the drive motor and the worm gear reduction mechanism in the existing steering gear structure. The planetary gear reduction mechanism acts as a first-stage reduction torque increase, which can achieve a large load output of the steering gear; at the same time, no major modification is made to the original steering gear structure, which is convenient for modifying the existing steering gear, reducing the manufacturing cost of the steering gear and facilitating the layout of the whole vehicle; the various housings of the steering gear are coaxially arranged in a split manner and can be detachably connected, and the coaxiality and connection strength of the various housings of the steering gear are high, which is convenient for steering Maintenance and disassembly of the steering gear; the transmission plate is rotationally connected to the planetary gear reducer housing through a slewing bearing, and the sun gear shaft is coaxially rotationally connected to the transmission plate through a balancing cam shaft, preventing axial movement of the sun gear shaft, planetary gear shaft, transmission plate and transmission shaft, thereby improving the stability of the planetary gear reduction mechanism when transmitting power, thereby improving the stability of the steering gear when working; a sleeve top screw connection structure is adopted between the sun gear shaft and coupling one and between the transmission shaft and the transition connection shaft, which improves the connection rigidity and strength of the connection structure at the input and output ends of the planetary gear reduction mechanism, and further improves the stability of the planetary gear reduction mechanism when transmitting power. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the utility model;

[0010] Figure 2 This is a schematic diagram of the internal structure of the steering gear of the utility model;

[0011] Figure 3 It is an exploded schematic diagram of each housing of the first-stage speed reduction and torque increase mechanism of the utility model;

[0012] Figure 4 This is a schematic diagram of the structure of the planetary gear reduction mechanism of the utility model;

[0013] Figure 5 This is a cross-sectional view of the steering gear of the utility model;

[0014] Figure 6for Figure 5 A partial enlarged view of the planetary gear reducer housing.

[0015] In the figure: 100, steering gear housing; 200, transition housing 1; 300, planetary gear reducer housing; 400, transition housing 2; 500, motor housing;

[0016] 1. Worm gear reduction mechanism; 11. Input shaft; 12. Worm wheel; 13. Worm; 2. Planetary gear reduction mechanism; 21. Sun gear shaft; 211. Balance cam shaft; 22. Planetary gear shaft; 23. External gear ring; 24. Transmission plate; 25. Transmission shaft; 26. Slewing bearing; 3. Coupling 1; 4. Drive motor; 5. Transition connecting shaft; 6. Bushing top screw A; 7. Bushing top screw B; 8. Ball screw pair; 81. Output shaft; 82. Steering gear; 83. Screw nut; 84. Rocker arm; 9. Coupling 2; 10. External convex ring. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0018] See also Figure 1-6The utility model provides a technical solution: a commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism, including a worm gear reduction mechanism 1 and a ball screw pair 8 arranged in a steering gear housing 100, the worm gear reduction mechanism 1 includes an input shaft 11 rotatably connected in the steering gear housing 100, a worm wheel 12 is arranged on the input shaft 11, and a worm 13 cooperating with the worm wheel 12 is rotatably connected in the steering gear housing 100; a transition housing 200, a planetary gear reducer housing 300, a transition housing 400 and a motor housing 500 are arranged in sequence along the axial direction of the worm 13 on the steering gear housing 100, and the transition housing 200, A transition connection shaft 5, a planetary gear reduction mechanism 2 and a drive motor 4 are respectively provided in the planetary gear reducer housing 300 and the motor housing 500 along the axial direction of the worm 13; the planetary gear reduction mechanism 2 includes a sun gear shaft 21 coaxially arranged with the rotating shaft of the drive motor 4, and a plurality of planetary gear shafts 22 meshing with the sun gear shaft 21 are provided in the circumferential direction thereof, and an outer gear ring 23 meshing with the planetary gear shafts 22 is also provided on the circumferential inner wall of the planetary gear reducer housing 300, and the rotating shafts of the planetary gear shafts 22 are all facing the worm 13, and a transmission disc 24 is connected between the rotating shafts of the planetary gear shafts 22, and a transmission shaft 25 coaxially connected with the transition connection shaft 5 is provided on the transmission disc 24;

[0019] A slewing bearing 26 is provided on the circumferential inner wall of the planetary gear reducer housing 300, and the transmission disc 24 is rotatably connected in the planetary gear reducer housing 300 via the slewing bearing 26; a balancing cam 211 is provided at one end of the sun gear shaft 21 facing the transmission disc 24, and the balancing cam 211 is coaxially arranged with the transmission disc 24 and rotatably connected thereto; the transmission disc 24 is rotatably connected to the planetary gear reducer housing 300 via the slewing bearing 26 to prevent the transmission disc 24 and the planetary gear shaft 22 from axial movement, and the sun gear shaft 21 is coaxially rotatably connected to the transmission disc 24 via the balancing cam 211 to prevent the sun gear shaft 21 from axial movement, thereby improving the stability of the planetary gear reduction mechanism 2 when transmitting power, thereby improving the stability of the steering gear when working.

[0020] The rotating shaft of the sun gear shaft 21 is fixedly connected to the rotating shaft of the driving motor 4 through a coupling 3, and a top screw hole 1 is provided on the circumferential outer wall of the sleeve portion of the coupling 3 that is connected to the sun gear shaft 21, and the sun gear shaft 21 is fixedly connected to the coupling 3 through a sleeve top screw A6 that penetrates the top screw hole 1, and the coupling 3 is located in the transition housing 2 400; the sun gear shaft 21 is fixedly connected to the coupling 3 through the sleeve top screw A6, thereby improving the connection rigidity and strength between the sun gear shaft 21 and the coupling 3.

[0021] The transition connecting shaft 5 is fixedly connected to the worm 13 through the coupling 2 9; a receiving hole compatible with the transmission shaft 25 is provided on the end face of the transition connecting shaft 5, and a top screw hole 2 is provided on the circumferential outer wall of the end of the transition connecting shaft 5, and the transmission shaft 25 is fixedly connected to the transition connecting shaft 5 through the top screw hole 2 of the sleeve top screw B7; the transmission shaft 25 on the transmission plate 24 is fixedly connected to the transition connecting shaft 5 through the sleeve top screw B7, thereby improving the connection rigidity and strength between the transmission shaft 25 and the transition connecting shaft 5.

[0022] The ball screw pair 8 includes an output shaft 81 rotatably connected in the steering gear housing 100, a steering gear 82 fixedly connected to the output shaft 81, a screw portion is provided on the input shaft 11, and a screw nut 83 is rollingly connected to the screw portion, the screw nut 83 is provided with meshing teeth that mesh with the steering gear 82, and a rocker arm 84 is fixedly provided at one end of the output shaft 81.

[0023] Furthermore, the axial front end faces of the transition housing 200, the planetary gear reducer housing 300, the transition housing 2 400 and the motor housing 500 are all provided with an outer convex ring 10; the outer convex ring 10 of the transition housing 200 is matched with the inner hole clearance of the steering gear housing 100 at the position of the worm 13, the outer convex ring 10 of the planetary gear reducer housing 300 is matched with the inner hole clearance of the end of the transition housing 200, the outer convex ring 10 of the transition housing 2 400 is matched with the inner hole clearance of the end of the planetary gear reducer housing 300, the outer convex ring 10 of the motor housing 500 is matched with the inner hole clearance of the end of the transition housing 2 400, and the steering gear housing 100, the transition housing 200, the planetary gear reducer housing 300, transition housing 2 400 and motor housing 500 are fixedly connected to each other by connecting bolts; the steering gear housing 100, transition housing 1 200, planetary gear reducer housing 300, transition housing 2 400 and motor housing 500 are separately arranged and detachably connected, which is convenient for the maintenance and disassembly of the steering gear; the steering gear housing 100, transition housing 1 200, planetary gear reducer housing 300, transition housing 2 400 and motor housing 500 are clearance-matched with each other through the outer convex ring 10, which can not only ensure the coaxiality between the steering gear housing 100, transition housing 1 200, planetary gear reducer housing 300, transition housing 2 400 and motor housing 500, but also play a role in positioning and enhancing the connection strength.

[0024] Working principle:

[0025] When the driving motor 4 drives the steering gear rocker arm 84 to swing, the driving motor 4 drives the sun gear shaft 21 to rotate. After the sun gear shaft 21 rotates, the planetary gear shaft 22 and the transmission plate 24 realize the first-stage deceleration and torque increase. The transmission shaft 25 on the transmission plate 24 transmits the power to the worm 13 through the transition connection shaft 5. The worm 13 rotates together with the transition connection shaft 5, and the second-stage deceleration and torque increase are realized through the meshing transmission of the worm 13 and the worm wheel 12. The worm wheel 12 drives the input shaft 11 to rotate. After the input shaft 11 rotates, the screw nut 83 slides along its axial direction, and the meshing teeth on the screw nut 83 mesh with the steering gear 82 and drive the output shaft 81 and the rocker arm 84 to rotate.

[0026] The commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism disclosed in this embodiment adds a planetary gear reduction mechanism 2 between the drive motor 4 and the worm gear reduction mechanism 1 in the existing steering gear structure. The planetary gear reduction mechanism 2 acts as a first-stage reduction torque increase to achieve a large load output of the steering gear; at the same time, no major modification is made to the original steering gear structure, thereby reducing the manufacturing cost of the steering gear and facilitating the layout of the entire vehicle; the steering gear housing 100, transition housing 1 200, planetary gear reducer housing 300, transition housing 2 400 and motor housing 500 are separately coaxially arranged and detachably connected, and the coaxiality and connection strength between the various steering gear housings are high, which is convenient for the maintenance and disassembly of the steering gear. The transmission plate 24 is rotationally connected to the planetary gear reducer housing 300 through the slewing bearing 26, and the sun gear shaft 21 is coaxially rotationally connected to the transmission plate 24 through the balancing cam 211, thereby preventing the sun gear shaft 21, the planetary gear shaft 22, the transmission plate 24 and the transmission shaft 25 from axial movement, thereby improving the stability of the planetary gear reduction mechanism 2 when transmitting power, thereby improving the stability of the steering gear when working; a sleeve top screw connection structure is adopted between the sun gear shaft 21 and the coupling 3 and between the transmission shaft 25 and the transition connection shaft 5, thereby improving the connection rigidity and strength of the connection structure between the input and output ends of the planetary gear reduction mechanism 2, and further improving the stability of the planetary gear reduction mechanism 2 when transmitting power.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism, comprising a worm gear reduction mechanism and a ball screw pair arranged in a steering gear housing, characterized in that: The worm gear reduction mechanism includes an input shaft rotatably connected in a steering gear housing, a worm wheel is provided on the input shaft, and a worm cooperating with the worm wheel is rotatably connected in the steering gear housing; a transition housing 1, a planetary gear reducer housing, a transition housing 2 and a motor housing are sequentially provided along the axial direction of the worm at one end of the steering gear housing, and a transition connecting shaft, a planetary gear reduction mechanism and a drive motor are respectively provided in the transition housing 1, the planetary gear reducer housing and the motor housing along the axial direction of the worm; the planetary gear reduction mechanism includes a sun gear shaft coaxially arranged with the driving motor shaft, a plurality of planetary gear shafts meshing with the sun gear shaft are provided in the circumferential direction of the sun gear shaft, and the circumferential inner wall of the planetary gear reducer housing An outer gear ring is also provided on it which meshes with the planetary gear shafts, the rotating shafts of the planetary gear shafts all face the worm, and a transmission plate is connected between the rotating shafts of the planetary gear shafts, and a transmission shaft coaxially connected to the transition connecting shaft is provided on the transmission plate; the rotating shaft of the sun gear shaft is fixedly connected to the rotating shaft of the drive motor through a coupling 1, and the coupling 1 is located in a transition housing 2, and the transition connecting shaft is fixedly connected to the worm through a coupling 2; the ball screw pair includes an output shaft rotatably connected in the steering gear housing, a steering gear fixedly connected to the output shaft, a screw portion is provided on the input shaft, and a screw nut is rollingly connected to the screw portion, the screw nut is provided with meshing teeth meshing with the steering gear, and a rocker arm is fixedly provided at one end of the output shaft.

2. The commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism according to claim 1, characterized in that: A slewing bearing is provided on the circumferential inner wall of the planetary gear reducer housing, and the transmission plate is rotatably connected in the planetary gear reducer housing through the slewing bearing; a balancing cam is provided at one end of the sun gear shaft facing the transmission plate, and the balancing cam is coaxially arranged with the transmission plate and rotatably connected thereto.

3. The commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism according to claim 1, characterized in that: The sleeve portion of the coupling 1 connected to the sun gear shaft has a top screw hole 1 on its circumferential outer wall, and the sun gear shaft is fixedly connected to the coupling 1 by passing through the top screw hole 1 through the sleeve top screw A; the end face of the transition connecting shaft terminal end is provided with a accommodating hole matched with the transmission shaft, and the circumferential outer wall of the end of the transition connecting shaft is provided with a top screw hole 2, and the transmission shaft is fixedly connected to the transition connecting shaft by passing through the top screw hole 2 through the sleeve top screw B.

4. The commercial vehicle electric mechanical recirculating ball steering gear with a two-stage reduction mechanism according to claim 1, characterized in that: The axial front end faces of the transition housing 1, the planetary gear reducer housing, the transition housing 2 and the motor housing are all provided with an outer convex ring; the outer convex ring of the transition housing 1 is matched with the inner hole clearance of the steering gear housing at the worm position, the outer convex ring of the planetary gear reducer housing is matched with the inner hole clearance of the end of the transition housing 1, the outer convex ring of the transition housing 2 is matched with the inner hole clearance of the end of the planetary gear reducer housing, the outer convex ring of the motor housing is matched with the inner hole clearance of the end of the transition housing 2, and the steering gear housing, the transition housing 1, the planetary gear reducer housing, the transition housing 2 and the motor housing are fixedly connected to each other by connecting bolts.

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