Steering gear assembly and vehicle

Abstract

The invention belongs to the technical field of vehicles, and discloses a steering gear assembly and a vehicle. The steering gear assembly comprises a shell, an input shaft, a first motor, a first transmission mechanism, a second transmission mechanism, a rocker arm shaft and a third transmission mechanism; the output of the planetary reduction assembly is directly used as the output of the rocker arm shaft, so that the stress of the reduction assembly is more uniform, the complicated stress is avoided, the bearing capacity and the mechanical transmission efficiency of the steering gear assembly are improved, the planetary reduction assembly is a modular component, the assembly is convenient and fast in the assembly process of the steering gear assembly, and the assembly efficiency is improved. Meanwhile, the rocker arm shaft is directly connected with the planet wheel, so that the output end of the steering gear assembly is located on the center line of the shell, the size of the steering gear assembly is optimized, and control arrangement of the whole vehicle is better facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a steering gear assembly and a vehicle. Background Art

[0002] Most of the existing commercial vehicle steering gears use recirculating ball steering gears as the mainstream solution, in which the steering gear uses a steering nut rack and a rocker arm shaft gear fan meshing output.

[0003] Since the steering nut and the rocker shaft are actually a gear rack structure, they occupy a large space, increase the volume of the steering gear, and affect the space layout of the vehicle. In addition, during the operation of the traditional steering gear, the steering nut is subjected to complex forces at the meshing point with the rocker shaft. The nut is subjected to axial and radial composite forces, which increases the contact between the steering nut and the inner wall of the shell, aggravates friction, and also aggravates the deformation of the screw in the steering nut.

[0004] Therefore, there is an urgent need for a steering gear assembly and a vehicle to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a steering gear assembly, which eliminates the steering nut mechanism, improves the load-bearing capacity and mechanical transmission efficiency of the steering gear assembly, and optimizes the volume of the steering gear assembly, which is more conducive to the control layout of the whole vehicle.

[0006] In order to solve the above problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] Steering gear assembly, including:

[0008] case;

[0009] An input shaft, the input shaft being rotatably disposed on the housing;

[0010] a first motor, wherein the first motor is disposed on the housing;

[0011] A first transmission mechanism, the first transmission mechanism comprising a first worm wheel and a first worm, the first worm being connected to an output end of the first motor, the first worm wheel being fixedly connected to the input shaft, and the first worm wheel being in transmission connection with the first worm;

[0012] a second transmission mechanism, the second transmission mechanism comprising a sun gear and a planetary gear, the sun gear being rotatably disposed on the housing, and the sun gear being transmission-connected to the planetary gear;

[0013] A rocker shaft, wherein the rocker shaft is rotatably disposed in the housing and is fixedly connected to the planetary gear, and a central axis of the rocker shaft is disposed parallel to a central axis of the sun gear;

[0014] The third transmission mechanism includes a first bevel gear and a second bevel gear, the first bevel gear is fixedly connected to the first worm gear, the second bevel gear is fixedly sleeved on the sun gear, and the second bevel gear is transmission-connected to the first bevel gear.

[0015] Preferably, the steering gear assembly also includes a second motor and a fourth transmission mechanism, the second motor is arranged on the housing, the fourth transmission mechanism is connected to the output end of the second motor, the third transmission mechanism also includes a third bevel gear, the third bevel gear is fixedly connected to the fourth transmission mechanism, and the third bevel gear is transmission connected to the second bevel gear.

[0016] Preferably, the first bevel gear, the second bevel gear and the third bevel gear are all helical gear structures.

[0017] Preferably, the fourth transmission mechanism includes a second worm wheel and a second worm, the second worm is connected to the output end of the second motor, the second worm wheel is rotatably arranged in the housing and fixedly connected to the third bevel gear, and the second worm wheel is transmission-connected to the second worm.

[0018] Preferably, the fourth transmission mechanism further includes a first bearing, the first bearing is disposed on the housing, an inner ring of the first bearing is fixedly connected to the second worm gear, and an outer ring of the first bearing is fixedly connected to the housing.

[0019] Preferably, the steering gear assembly also includes an adjusting component, which includes a connecting rod and a gasket, wherein both ends of the connecting rod are respectively fixedly connected to the second worm gear and the third bevel gear, the gasket is sleeved on the connecting rod, and the gasket is arranged between the second worm gear and the third bevel gear.

[0020] Preferably, there are multiple gaskets, and the multiple gaskets are stacked.

[0021] Preferably, the second transmission mechanism further comprises an outer shell, which is located in the housing and fixedly connected to the second bevel gear. There are multiple planetary gears, and all of the multiple planetary gears are meshedly connected to the outer shell.

[0022] Preferably, the steering gear assembly further includes a second bearing, which is disposed on the housing, wherein an inner ring of the second bearing is fixedly connected to an outer periphery of the rocker arm shaft, and an outer ring of the second bearing is fixedly connected to the housing.

[0023] To achieve the above object, the present invention further provides a vehicle, comprising a vehicle frame and the above steering gear assembly, wherein the steering gear assembly is arranged on the vehicle frame.

[0024] The beneficial effects of the present invention are:

[0025] The steering gear assembly provided by the present invention has an input shaft rotatably arranged on a housing, a first motor arranged on the housing, a first transmission mechanism including a first worm wheel and a first worm, the first worm is connected to the output end of the first motor, the first worm wheel is fixedly connected to the input shaft, and the first worm wheel is in transmission connection with the first worm. The second transmission mechanism includes a sun gear and a planetary gear, the sun gear is rotatably arranged on the housing, and the sun gear is in transmission connection with the planetary gear, the rocker arm shaft is rotatably arranged in the housing, and the rocker arm shaft is fixedly connected to the planetary gear, and the third transmission mechanism includes a first bevel gear and a second bevel gear, the first bevel gear is fixedly connected to the first worm wheel, the second bevel gear is fixedly sleeved on the sun gear, and the second bevel gear is in transmission connection with the first bevel gear. The first motor drives the first worm to rotate, the first worm drives the first worm wheel to rotate around the axis of the input shaft, the first worm wheel drives the first bevel gear to rotate synchronously, the first bevel gear drives the second bevel gear to rotate around the axis of the sun gear, the second bevel gear drives the sun gear to rotate synchronously, the sun gear drives the planetary gear to perform planetary motion around the sun gear, and then drives the rocker arm shaft to rotate and output power. The steering gear assembly adopts a combination of worm gears, bevel gears and planetary reduction assembly, cancels the steering nut mechanism, and directly uses the output of the planetary reduction assembly as the output of the rocker shaft, making the force of the reduction assembly more uniform, avoiding complex force, and improving the load-bearing capacity and mechanical transmission efficiency of the steering gear assembly. In addition, the planetary reduction assembly is a modular component, which is convenient for assembly and improves assembly efficiency during the assembly process of the steering gear assembly. At the same time, the rocker shaft is directly connected to the planetary gear, so that the output end of the steering gear assembly is located on the center line of the shell, optimizing the volume of the steering gear assembly and more conducive to the control layout of the whole vehicle.

[0026] The vehicle provided by the present invention comprises a frame and a steering gear assembly, wherein the steering gear assembly is arranged on the frame. The vehicle uses the above-mentioned steering gear assembly, adopts a combination of a worm gear, a bevel gear and a planetary reduction assembly, cancels the steering nut mechanism, and directly uses the output of the planetary reduction assembly as the output of the rocker shaft, so that the reduction mechanism is more evenly stressed, avoids complex stress, and improves the load-bearing capacity and mechanical transmission efficiency of the steering gear assembly. In addition, the rocker shaft is directly connected to the planetary gear, so that the output end of the steering gear assembly is located at the center line of the housing, which optimizes the volume of the steering gear assembly and is more conducive to the vehicle control layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a steering gear assembly provided in an embodiment of the present invention;

[0028] Figure 2 A cross-sectional view of a steering gear assembly provided by an embodiment of the present invention;

[0029] Figure 3A schematic diagram of the internal structure of a steering gear assembly provided in an embodiment of the present invention;

[0030] Figure 4 A schematic structural diagram of a second transmission mechanism and a rocker shaft provided in an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1. Housing; 2. Input shaft; 3. First motor; 4. First worm gear; 5. First worm; 6. Sun gear; 7. Planetary gear; 8. Rocker shaft; 9. First bevel gear; 10. Second bevel gear; 11. Second motor; 12. Third bevel gear; 13. Second worm gear; 14. Second worm; 15. First bearing; 16. Connecting rod; 17. Gasket; 18. Housing; 19. Second bearing; 20. Third bearing. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figure 1-Figure 4 As shown, in this embodiment, the steering gear assembly includes a housing 1, an input shaft 2, a first motor 3, a first transmission mechanism, a second transmission mechanism, a rocker shaft 8 and a third transmission mechanism. Among them, the input shaft 2 is rotatably arranged on the housing 1, the first motor 3 is arranged on the housing 1, the first transmission mechanism includes a first worm gear 4 and a first worm 5, the first worm 5 is connected to the output end of the first motor 3, the first worm gear 4 is fixedly connected to the input shaft 2, and the first worm gear 4 is in transmission connection with the first worm 5. The second transmission mechanism includes a sun gear 6 and a planetary gear 7, the sun gear 6 is rotatably arranged on the housing 1, and the sun gear 6 is in transmission connection with the planetary gear 7, the rocker shaft 8 is rotatably arranged in the housing 1, and the rocker shaft 8 is fixedly connected to the planetary gear 7, the central axis of the rocker shaft 8 is arranged parallel to the central axis of the sun gear 6, and the third transmission mechanism includes a first bevel gear 9 and a second bevel gear 10, the first bevel gear 9 is fixedly connected to the first worm gear 4, the second bevel gear 10 is fixedly sleeved on the sun gear 6, and the second bevel gear 10 is in transmission connection with the first bevel gear 9.

[0038] Specifically, the housing 1 is a main housing body, a lower end cover, a rear end cover and an upper end cover, which are assembled by bolts to form an accommodating chamber. The input shaft 2 is rotatably connected in the housing 1, and the first transmission mechanism, the second transmission mechanism and the third transmission mechanism are all arranged in the accommodating chamber. The first motor 3 is installed on the side wall of the housing 1, and the output end of the first motor 3 is connected to the first worm 5. The first worm gear 4 is pressed on the input shaft 2 and meshed with the first worm 5. The first bevel gear 9 is pressed on the first worm gear 4. The second bevel gear 10 is pressed on the sun gear 6 and meshed with the first bevel gear 9. The sun gear 6 is rotatably connected to the housing 1 through a bearing. The planetary gear 7 is meshed with the sun gear 6. The rocker arm shaft 8 is rotatably connected to the housing 1 and fixedly connected with the planetary gear 7. The working process of the steering gear assembly is as follows: the first motor 3 drives the first worm 5 to rotate, the first worm 5 drives the first worm wheel 4 to rotate around the axis of the input shaft 2, the first worm wheel 4 drives the first bevel gear 9 to rotate synchronously, the first bevel gear 9 drives the second bevel gear 10 to rotate around the axis of the sun gear 6, the second bevel gear 10 drives the sun gear 6 to rotate synchronously, the sun gear 6 drives the planetary gear 7 to perform planetary motion around the sun gear 6, and then drives the rocker shaft 8 to rotate and output power. The steering gear assembly adopts a combination of worm gears, bevel gears and planetary reduction assembly, cancels the steering nut mechanism, and directly uses the output of the planetary reduction assembly as the output of the rocker shaft 8, so that the force of the reduction assembly is more uniform, avoids complex force, and improves the bearing capacity and mechanical transmission efficiency of the steering gear assembly. In addition, the planetary reduction assembly is a modular component, which is convenient to assemble and improves the assembly efficiency during the assembly process of the steering gear assembly. At the same time, the rocker shaft 8 is directly connected to the planetary gear 7, so that the output end of the steering gear assembly is located at the center line of the housing 1, which optimizes the volume of the steering gear assembly and is more conducive to the control layout of the whole vehicle.

[0039] Further, continue to refer to Figure 1-Figure 4The steering gear assembly also includes a second motor 11 and a fourth transmission mechanism. The second motor 11 is arranged on the housing 1. The fourth transmission mechanism is connected to the output end of the second motor 11. The third transmission mechanism also includes a third bevel gear 12. The third bevel gear 12 is fixedly connected to the fourth transmission mechanism, and the third bevel gear 12 is transmission-connected to the second bevel gear 10. Specifically, the first bevel gear 9, the second bevel gear 10 and the third bevel gear 12 are all helical gear structures. The first bevel gear 9 and the third bevel gear 12 are simultaneously meshed with the second bevel gear 10 to transmit power. The fourth transmission mechanism includes a second worm gear 13 and a second worm 14. The second worm 14 is connected to the output end of the second motor 11. The second worm gear 13 is rotatably arranged in the housing 1 and fixedly connected to the third bevel gear 12. The second worm gear 13 is transmission-connected to the second worm 14. The second motor 11 drives the second worm 14 to rotate, the second worm 14 drives the second worm wheel 13 to rotate around the axis of the input shaft 2, the second worm wheel 13 drives the third bevel gear 12 to rotate synchronously, the third bevel gear 12 drives the second bevel gear 10 to rotate around the axis of the sun gear 6, the second bevel gear 10 drives the sun gear 6 to rotate synchronously, the sun gear 6 drives the planetary gear 7 to make planetary motion around the sun gear 6, and then drives the rocker shaft 8 to rotate and output power. Dual motor drive is adopted, the first motor 3 and the second motor 11 are arranged on the upper and lower sides of the housing 1 respectively, and drive the first transmission mechanism and the fourth transmission mechanism respectively. When the first motor 3 or the first transmission mechanism fails, the steering gear assembly can rely on the second motor 11 and the fourth transmission mechanism to provide assistance.

[0040] Further, continue to refer to Figure 1-Figure 4 The fourth transmission mechanism further includes a first bearing 15, which is disposed on the housing 1, the inner ring of the first bearing 15 is fixedly connected to the second worm gear 13, the outer ring of the first bearing 15 is fixedly connected to the housing 1, and the second worm gear 13 is rotatably mounted on the housing 1 through the first bearing 15. The steering gear assembly further includes a second bearing 19, which is disposed on the housing 1, the inner ring of the second bearing 19 is fixedly connected to the outer periphery of the rocker arm shaft 8, the outer ring of the second bearing 19 is fixedly connected to the housing 1, and the rocker arm shaft 8 is rotatably disposed on the housing 1 through the second bearing 19. The steering gear assembly further includes a third bearing 20, which is sleeved on the input shaft 2, the inner ring of the third bearing 20 is fixedly connected to the outer side wall of the input shaft 2, the outer ring of the third bearing 20 is fixedly connected to the housing 1, and the input shaft 2 is rotatably disposed on the housing 1 through the third bearing 20.

[0041] Further, continue to refer to Figure 1-Figure 4The steering gear assembly also includes an adjustment component, which includes a connecting rod 16 and a gasket 17. The two ends of the connecting rod 16 are respectively fixedly connected to the second worm gear 13 and the third bevel gear 12. The gasket 17 is sleeved on the connecting rod 16, and the gasket 17 is arranged between the second worm gear 13 and the third bevel gear 12. Specifically, the second worm gear 13 and the third bevel gear 12 are fixed by the connecting rod 16, and there are multiple gaskets 17, which are stacked. The spacing between the second worm gear 13 and the third bevel gear 12 is adjusted by increasing or decreasing the number of gaskets 17, thereby adjusting the meshing state between the third bevel gear 12 and the second bevel gear 10.

[0042] Further, continue to refer to Figure 1-Figure 4 The second transmission mechanism further includes a housing 18, which is located in the housing 1 and fixedly connected to the second bevel gear 10. There are multiple planetary gears 7, and the multiple planetary gears 7 are all meshed and connected with the housing 18. Specifically, the inner peripheral wall of the housing 18 is provided with meshing teeth, and the multiple planetary gears 7 are meshed and connected with the housing 18 through the meshing teeth. The rocker shaft 8 is fixed to the multiple planetary gears 7 at the same time. The multiple planetary gears 7 rotate around the axis of the sun gear 6 under the drive of the sun gear 6, thereby driving the rocker shaft 8 to rotate.

[0043] This embodiment also provides a vehicle, including a frame and the above-mentioned steering gear assembly, and the steering gear assembly is arranged on the frame. Specifically, the vehicle uses the above-mentioned steering gear assembly, adopts a combination of a worm gear, a bevel gear and a planetary reduction assembly, cancels the steering nut mechanism, and directly uses the output of the planetary reduction assembly as the output of the rocker shaft 8, so that the reduction mechanism is more evenly stressed, avoids complex stress, and improves the load-bearing capacity and mechanical transmission efficiency of the steering gear assembly. In addition, the rocker shaft 8 is directly connected to the planetary gear 7, so that the output end of the steering gear assembly is located on the center line of the housing 1, which optimizes the volume of the steering gear assembly and is more conducive to the vehicle control layout.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Steering gear assembly, characterized in that: include: Housing (1); An input shaft (2), the input shaft (2) being rotatably disposed on the housing (1); A first motor (3), wherein the first motor (3) is arranged on the housing (1); a first transmission mechanism, the first transmission mechanism comprising a first worm wheel (4) and a first worm (5), the first worm (5) being connected to an output end of the first motor (3), the first worm wheel (4) being fixedly connected to the input shaft (2), and the first worm wheel (4) being transmission-connected to the first worm (5); A second transmission mechanism, the second transmission mechanism comprising a sun gear (6) and a planetary gear (7), the sun gear (6) being rotatably disposed on the housing (1), and the sun gear (6) being transmission-connected to the planetary gear (7); A rocker shaft (8), the rocker shaft (8) being rotatably disposed in the housing (1), and the rocker shaft (8) being fixedly connected to the planetary gear (7), and the central axis of the rocker shaft (8) being arranged parallel to the central axis of the sun gear (6); A third transmission mechanism, the third transmission mechanism comprising a first bevel gear (9) and a second bevel gear (10), the first bevel gear (9) being fixedly connected to the first worm gear (4), the second bevel gear (10) being fixedly sleeved on the sun gear (6), and the second bevel gear (10) being transmission-connected to the first bevel gear (9).

2. The steering gear assembly according to claim 1, characterized in that: The steering gear assembly further comprises a second motor (11) and a fourth transmission mechanism, wherein the second motor (11) is arranged on the housing (1), the fourth transmission mechanism is connected to the output end of the second motor (11), and the third transmission mechanism further comprises a third bevel gear (12), the third bevel gear (12) is fixedly connected to the fourth transmission mechanism, and the third bevel gear (12) is transmission-connected to the second bevel gear (10).

3. The steering gear assembly according to claim 2, characterized in that: The first bevel gear (9), the second bevel gear (10) and the third bevel gear (12) all have helical gear structures.

4. The steering gear assembly according to claim 2, characterized in that: The fourth transmission mechanism comprises a second worm wheel (13) and a second worm (14); the second worm (14) is connected to the output end of the second motor (11); the second worm wheel (13) is rotatably arranged in the housing (1) and fixedly connected to the third bevel gear (12); the second worm wheel (13) is transmission-connected to the second worm (14).

5. The steering gear assembly according to claim 4, characterized in that: The fourth transmission mechanism further comprises a first bearing (15), the first bearing (15) being arranged on the housing (1), the inner ring of the first bearing (15) being fixedly connected to the second worm gear (13), and the outer ring of the first bearing (15) being fixedly connected to the housing (1).

6. The steering gear assembly according to claim 4, characterized in that: The steering gear assembly also includes an adjustment component, which includes a connecting rod (16) and a gasket (17). The two ends of the connecting rod (16) are respectively fixedly connected to the second worm gear (13) and the third bevel gear (12). The gasket (17) is sleeved on the connecting rod (16), and the gasket (17) is arranged between the second worm gear (13) and the third bevel gear (12).

7. The steering gear assembly according to claim 6, characterized in that: There are a plurality of gaskets (17), and the plurality of gaskets (17) are stacked.

8. The steering gear assembly according to claim 1, characterized in that: The second transmission mechanism further comprises a housing (18), wherein the housing (18) is located inside the casing (1) and is fixedly connected to the second bevel gear (10), and there are a plurality of planetary gears (7), and the plurality of planetary gears (7) are all meshingly connected to the housing (18).

9. The steering gear assembly according to claim 1, characterized in that: The steering gear assembly further comprises a second bearing (19), wherein the second bearing (19) is arranged on the housing (1), wherein the inner ring of the second bearing (19) is fixedly connected to the outer periphery of the rocker arm shaft (8), and the outer ring of the second bearing (19) is fixedly connected to the housing (1).

10. A vehicle, characterized in that It comprises a vehicle frame and a steering gear assembly as described in any one of claims 1 to 9, wherein the steering gear assembly is arranged on the vehicle frame.

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