CN113942567A

CN113942567A - Double-motor driven steering gear

Info

Publication number: CN113942567A
Application number: CN202111275177.9A
Authority: CN
Inventors: 朱兴旺; 万民伟; 朱胜峰; 虞忠潮; 任培; 雷浩
Original assignee: Hangzhou Shibao Auto Steering Gear Co ltd
Current assignee: Hangzhou Shibao Auto Steering Gear Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-01-18
Anticipated expiration: 2041-10-29
Also published as: CN113942567B

Abstract

The invention discloses a double-motor driven steering gear, which relates to the technical field of automobile steering and comprises a worm wheel, a worm, a vehicle speed sensor, a transmission assembly, an output shaft, a first controller, a second controller, a first motor and a second motor, wherein: the vehicle speed sensor is respectively connected with the input end of the first controller and the input end of the second controller; the output end of the first controller is connected with the input end of the first motor, and the output end of the second controller is connected with the input end of the second motor; the worm is connected with the worm wheel, one end of the worm is connected with the output end of the first motor, and the other end of the worm is connected with the output end of the second motor; the worm gear is sleeved on the transmission assembly, and the transmission assembly is meshed with the output shaft; the output shaft includes axial region and tooth portion, the tooth portion is equipped with the bulging structure that leans on each other with drive assembly, the axial region is used for connecting the rear wheel transaxle.

Description

Double-motor driven steering gear

Technical Field

The invention relates to the technical field of automobile steering, in particular to a double-motor driven steering gear.

Background

In order to meet the load requirements of large vehicles in the passenger vehicle market, more and more vehicles start to be replaced from hydraulic power assistance to electric power assistance at present, but the automobile steering mainly adopts front wheel steering, because the front wheel steering technology is mature and the price is relatively low, but the turning radius of the front wheel steering is larger, especially for the vehicles with larger wheelbase, the vehicles are difficult to turn at a narrow intersection or park in a narrow space, and when the vehicles turn sharply at a high speed, the vehicle body is easy to drift, so that the potential safety hazard is very large.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention provides a double-motor driven steering gear, aiming at the technical problems that the turning radius of the front wheel is larger and the vehicle body is easy to drift, which ensures the consistency of the directional positions of the rear wheels, so that the turning radius is small when the vehicle is steered at a low speed, and the rear wheels are stable when the vehicle is steered at a high speed.

2. Technical scheme

In order to solve the problems, the technical scheme provided by the invention is as follows: the utility model provides a bi-motor driven steering gear, includes worm wheel, worm, speed sensor, transmission assembly, output shaft, first controller, second controller, first motor and second motor, wherein: the vehicle speed sensor is respectively connected with the input end of the first controller and the input end of the second controller; the output end of the first controller is connected with the input end of the first motor, and the output end of the second controller is connected with the input end of the second motor; the worm is connected with the worm wheel, one end of the worm is connected with the output end of the first motor, and the other end of the worm is connected with the output end of the second motor; the worm gear is sleeved on the transmission assembly, and the transmission assembly is meshed with the output shaft; the output shaft includes axial region and tooth portion, the tooth portion is equipped with the bulging structure that leans on each other with drive assembly, the axial region is used for connecting the rear wheel transaxle.

Optionally, the tooth portion includes a first tooth, a second tooth and a third tooth that are sequentially arranged along the circumferential direction of the shaft portion, and the two sides of the second tooth are provided with the bulging structure.

Optionally, the transmission assembly includes a screw rod and a first nut, the first nut has a top portion and a bottom portion symmetrically arranged, the bottom portion is meshed with the tooth portion, the screw rod is eccentrically arranged on the first nut in a penetrating manner, and the screw rod is close to the top portion.

Optionally, a second nut is further sleeved on the screw rod, and the periphery of the second nut is sleeved with the first nut.

Optionally, a gap is provided between the first nut and the second nut.

Optionally, still include the casing, worm wheel and drive assembly all set up inside the casing, one side that the axial region is close to the worm wheel is equipped with first stopper, the casing inside wall is equipped with the first baffle with first stopper movable contact.

Optionally, one side of the shaft part, which is far away from the worm wheel, is provided with a second limiting block, and the inner side wall of the shell is provided with a second baffle which is in movable contact with the second limiting block.

Optionally, the controller further comprises a torque sensor, and the torque sensor is respectively connected with the input end of the first controller and the input end of the second controller.

Optionally, the transmission assembly has first teeth of a cogwheel, second teeth of a cogwheel, the third tooth that sets gradually, first teeth of a cogwheel and first tooth meshing, the second teeth of a cogwheel and second tooth meshing, the third teeth of a cogwheel and third tooth meshing.

Optionally, a ball is arranged between the screw and the second nut.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) the double-motor driven steering gear provided by the embodiment of the application transmits a vehicle speed signal to the first controller and the second controller when steering, the first controller and the second controller respectively control the first motor and the second motor to apply different forces to the worm according to the vehicle speed information, the worm is enabled to lock the worm wheel, the directional position consistency of the rear wheel is ensured, the vehicle is enabled to have a small turning radius when steering at a low speed, and the rear wheel is stable when steering at a high speed. The bulge structure on the tooth part eliminates a gap between the tooth part and the transmission assembly, so that the tooth part is tightly meshed with the transmission assembly, the output torque between the tooth part and the transmission assembly is increased, and the stability of the rear wheel in the steering process is further increased. The first motor and the second motor also play a role of redundancy, when one motor fails, the other motor can work alternatively, and the running safety of the vehicle is ensured.

(2) The two motor drive steering gears that this application embodiment provided, the meshing distance of bottom has been guaranteed to the screw rod setting of deviating from the top, can reduce the volume of first nut again, and then reduces the volume of casing, reaches the purpose that alleviates whole steering gear volume and weight.

(3) The double-motor-driven steering gear provided by the embodiment of the application has the advantages that the worm drives the worm wheel to rotate, the worm wheel drives the screw rod to rotate, the first nut sleeved on the screw rod reciprocates along the screw rod, when the first nut moves towards one end of the worm wheel sleeved on the screw rod, the first limiting block is abutted against the first baffle plate, the first nut is prevented from excessively moving and colliding with the worm wheel, and the normal work of the steering gear is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a two-motor driven steering gear according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram of a two-motor driven steering gear according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an output shaft of a two-motor driven steering gear according to an embodiment of the present invention.

Fig. 4 is an enlarged schematic view of a in fig. 3.

The labels in the various figures are: 1. a worm gear; 2. a worm; 3. a screw; 4. a first nut; 401. a top portion; 402. a bottom; 4021. a first gear tooth; 4022. a second gear tooth; 4023. a third gear tooth; 5. a second nut; 6. a housing; 601. a first baffle plate; 602. a second baffle; 7. an output shaft; 701. a shaft portion; 702. a tooth portion; 7021. a first tooth; 7022. a second tooth; 7023. a third tooth; 7024. a bulging structure; 703. a first stopper; 704. a second limiting block; 8. a first controller; 9. a second controller; 10. a first motor; 11. a second motor; 12. a vehicle speed sensor; 13. and a ball.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The terms first, second, and the like in the present invention are provided for convenience of describing the technical solution of the present invention, and have no specific limiting effect, but are all generic terms, and do not limit the technical solution of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, and the technical solutions are within the scope of the present invention.

Example 1

With reference to fig. 1-4, the dual-motor driven steering gear of the present embodiment includes a worm wheel 1, a worm 2, a vehicle speed sensor 12, a transmission assembly, an output shaft 7, a first controller 8, a second controller 9, a first motor 10, and a second motor 11, wherein: the vehicle speed sensor 12 is respectively connected with the input end of the first controller 8 and the input end of the second controller 9; the output end of the first controller 8 is connected with the input end of a first motor 10, and the output end of the second controller 9 is connected with the input end of a second motor 11; the worm 2 is connected with the worm wheel 1, one end of the worm 2 is connected with the output end of the first motor 10, and the other end of the worm 2 is connected with the output end of the second motor 11; the worm wheel 1 is sleeved on the transmission assembly, and the transmission assembly is meshed with the output shaft 7; the output shaft 7 comprises a shaft part 701 and a tooth part 702, the tooth part 702 is provided with a bulge structure 7024 which is abutted with the transmission assembly, and the shaft part 701 is used for connecting a rear wheel drive axle. When the vehicle turns, the vehicle speed sensor 12 transmits a vehicle speed signal to the first controller 8 and the second controller 9, the first controller 8 and the second controller 9 respectively control the first motor 10 and the second motor 11 to apply different forces to the worm 2 according to the vehicle speed information, so that the worm 2 locks the worm wheel 1, the directional position consistency of the rear wheel is ensured, the turning radius is small when the vehicle turns at a low speed, and the rear wheel is stable when the vehicle turns at a high speed. The bulge structure 7024 on the tooth 702 eliminates a gap between the tooth 702 and the transmission assembly, so that the tooth 702 is tightly meshed with the transmission assembly, the output torque between the tooth 702 and the transmission assembly is increased, and the stability of the rear wheel in the steering process is further increased. The first motor 10 and the second motor 11 also play a role of redundancy, when one of the motors fails, the other motor can work instead, and the safety of vehicle running is ensured.

Example 2

With reference to fig. 1-4, compared with the technical solution of embodiment 1, the two-motor driven steering gear of this embodiment can be improved as follows: the tooth portion 702 includes a first tooth 7021, a second tooth 7022, and a third tooth 7023 that are sequentially arranged along the circumferential direction of the shaft portion 701, and the bulging structures 7024 are provided on both sides of the second tooth 7022. When the transmission assembly drives the tooth portion 702 to move repeatedly, the second tooth 7022 located in the middle of the tooth portion 702 is in close contact with the gear teeth on the transmission assembly, and the bulge structure 7024 makes up a gap between the second tooth 7022 and the transmission assembly, so that the second tooth 7022 is in close engagement with the transmission assembly, and the output torque of the transmission assembly and the output shaft 7 is increased. The three teeth are arranged to simplify the structure of the tooth 702 as much as possible and to complete the meshing action of the tooth 702 and the transmission assembly. In other embodiments, the first tooth 7021, the second tooth 7022, and the third tooth 7023 can each be provided with a bulge structure 7024.

Example 3

With reference to fig. 1-4, the two-motor driven steering gear of the present embodiment can be improved as follows compared with the technical solutions of embodiment 1 or 2: the transmission assembly comprises a screw rod 3 and a first nut 4, the first nut 4 is provided with a top part 401 and a bottom part 402 which are symmetrically arranged, the bottom part 402 is meshed with a tooth part 702, the screw rod 3 is eccentrically arranged through the first nut 4, and the screw rod 3 is close to the top part 401. The screw rod 3 is arranged in a mode of deviating from the top 401, so that the meshing distance of the bottom 402 is guaranteed, the size of the first nut 4 can be reduced, the size of the shell 6 is further reduced, and the purposes of reducing the size and the weight of the whole steering gear are achieved.

Example 4

With reference to fig. 1 to 4, the two-motor driven steering gear of the present embodiment can be improved as follows compared with any of the technical solutions of embodiments 1 to 3: still the cover is equipped with second nut 5 on the screw rod 3, the periphery at second nut 5 is established to first nut 4 cover.

Example 5

With reference to fig. 1 to 4, the two-motor driven steering gear of the present embodiment can be improved as follows compared with any one of the technical solutions of embodiments 1 to 4: the first nut 4 and the second nut 5 have a gap therebetween. When the output shaft 7 applies a reaction force to the first nut 4, the first nut 4 is forced to move towards the radial direction, and the cavity is formed between the first nut 4 and the second nut 5, so that the second nut 5 arranged inside the first nut 4 cannot be forced by the radial force, and the screw rod 3 is prevented from being forced to deform.

Example 6

With reference to fig. 1 to 4, the two-motor driven steering gear of the present embodiment can be improved as follows compared with any of the technical solutions of embodiments 1 to 5: the worm wheel 1 and the transmission assembly are both arranged inside the shell 6, a first limiting block 703 is arranged on one side of the shaft part 701 close to the worm wheel 1, and a first baffle 601 in movable contact with the first limiting block 703 is arranged on the inner side wall of the shell 6. The worm 2 drives the worm wheel 1 to rotate, the worm wheel 1 drives the screw rod 3 to rotate, the first nut 4 sleeved on the screw rod 3 reciprocates along the screw rod 3, when the first nut 4 moves towards one end of the screw rod 3 sleeved with the worm wheel 1, the first limiting block 703 is abutted against the first baffle 601, the first nut 4 is prevented from excessively moving and colliding with the worm wheel 1, and the normal work of the steering gear box is ensured.

Example 7

With reference to fig. 1 to 4, the two-motor driven steering gear of the present embodiment can be improved as follows compared with any of the technical solutions of embodiments 1 to 6: a second limiting block 704 is arranged on one side of the shaft part 701, which is far away from the worm wheel 1, and a second baffle 602 in movable contact with the second limiting block 704 is arranged on the inner side wall of the shell 6. One end to the other end of screw rod 3 is overlapped in proper order and is equipped with first bearing, worm wheel 1, steering nut and second bearing, and worm wheel 1 is located between first bearing and the second bearing, has increased worm wheel 1's bearing capacity, makes worm wheel 1 have better rigidity. One side of the sector gear, which is far away from the worm wheel 1, is close to the second bearing, and when the steering nut moves towards one end of the screw rod 3, which is sleeved with the second bearing, the second limiting block 704 abuts against the second baffle 602, so that the steering nut is prevented from excessively moving and colliding with the second bearing, and the normal work of the steering gear box is ensured.

Example 8

With reference to fig. 1 to 4, the two-motor driven steering gear of the present embodiment can be improved as follows compared with any of the technical solutions of embodiments 1 to 7: and the torque sensor is respectively connected with the input end of the first controller 8 and the input end of the second controller 9. The torque sensor transmits the rotation angle torque information to the first controller 8 and the second controller 9, and the first controller 8 and the second controller 9 respectively control the first motor 10 and the second motor 11 to apply different forces to the worm 2 according to the vehicle speed information to complete the power-assisted steering work.

Example 9

With reference to fig. 1 to 4, the two-motor driven steering gear of the present embodiment can be improved as follows compared with any of the technical solutions of embodiments 1 to 8: the transmission assembly, namely the bottom 402, is provided with a first gear tooth 4021, a second gear tooth 4022 and a third gear tooth 4023 which are sequentially arranged, wherein the first gear tooth 4021 is engaged with the first gear tooth 7021, the second gear tooth 4022 is engaged with the second gear tooth 7022, and the third gear tooth 4023 is engaged with the third gear tooth 7023. The second gear 7022 located in the middle of the tooth 702 is always in contact with the second gear 4022, and the bulge structure 7024 makes up a gap between the second gear 7022 and the second gear 4022, so that the second gear 7022 is tightly engaged with the second gear 4022, and the output torque of the transmission assembly and the output shaft 7 is increased.

Example 10

With reference to fig. 1 to 4, the two-motor driven steering gear of the present embodiment can be improved as follows compared with any of the technical solutions of embodiments 1 to 9: and a ball 13 is arranged between the screw rod 3 and the second nut 5. The balls 13 change the sliding friction between the screw 3 and the second nut 5 into rolling friction, reducing the resistance to movement.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. The utility model provides a bi-motor drive steering gear, its characterized in that includes worm wheel, worm, speed sensor, transmission assembly, output shaft, first controller, second controller, first motor and second motor, wherein:

the vehicle speed sensor is respectively connected with the input end of the first controller and the input end of the second controller;

the output end of the first controller is connected with the input end of the first motor, and the output end of the second controller is connected with the input end of the second motor;

the worm is connected with the worm wheel, one end of the worm is connected with the output end of the first motor, and the other end of the worm is connected with the output end of the second motor; the worm gear is sleeved on the transmission assembly, and the transmission assembly is meshed with the output shaft;

the output shaft includes axial region and tooth portion, the tooth portion is equipped with the bulging structure that leans on each other with drive assembly, the axial region is used for connecting the rear wheel transaxle.

2. The dual motor driven steering gear according to claim 1, wherein the tooth portion includes a first tooth, a second tooth, and a third tooth sequentially arranged along a circumferential direction of the shaft portion, and the bulging structure is provided on both sides of the second tooth.

3. The dual motor drive steering gear of claim 1, wherein the transmission assembly includes a threaded rod and a first nut, the first nut having a top portion and a bottom portion symmetrically disposed, the bottom portion engaging the toothed portion, the threaded rod eccentrically disposed through the first nut, the threaded rod being proximate the top portion.

4. The dual-motor driven steering gear according to claim 3, wherein a second nut is further sleeved on the screw rod, and the first nut is sleeved on the outer periphery of the second nut.

5. The dual motor drive diverter of claim 4, wherein the first nut and the second nut have a gap therebetween.

6. The dual-motor driven steering gear according to claim 1, further comprising a housing, wherein the worm wheel and the transmission assembly are both disposed inside the housing, a first stopper is disposed on a side of the shaft portion close to the worm wheel, and a first baffle movably contacting with the first stopper is disposed on an inner side wall of the housing.

7. The dual motor driven steering gear according to claim 6, wherein a second stopper is disposed on a side of the shaft portion away from the worm wheel, and a second baffle movably contacting with the second stopper is disposed on an inner sidewall of the housing.

8. The dual motor driven steering gear according to claim 1, further comprising torque sensors connected to the input of the first controller and the input of the second controller, respectively.

9. The dual motor drive steering gear according to claim 2, wherein the transmission assembly has a first gear tooth, a second gear tooth, and a third gear tooth arranged in sequence, the first gear tooth being engaged with the first gear tooth, the second gear tooth being engaged with the second gear tooth, and the third gear tooth being engaged with the third gear tooth.

10. The dual motor drive diverter of claim 4, wherein balls are disposed between the screw and the second nut.