CN216185448U

CN216185448U - Double-motor power-assisted steering device

Info

Publication number: CN216185448U
Application number: CN202122651579.6U
Authority: CN
Inventors: 虞忠潮; 朱兴旺; 万民伟; 朱胜峰; 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: 2022-04-05
Anticipated expiration: 2031-10-29

Abstract

The utility model discloses a double-motor power-assisted steering device, and relates to the technical field of power-assisted steering equipment, wherein two ends of a worm are respectively connected with a motor; the worm wheel, the first bearing, the second bearing, the screw rod and the steering nut are all arranged in the shell; a first bearing, a worm wheel, a steering nut and a second bearing are sequentially sleeved from one end to the other end of the screw rod, and the steering nut is meshed with the output shaft; one side of the output shaft close to the worm wheel is provided with a first limiting block, and the shell is provided with a first baffle matched with the first limiting block. The worm wheel sets up inside the casing, lies in between first bearing and the second bearing, can effectively reduce bi-motor power assisted steering device's volume, and the worm drives the worm wheel and rotates, and the worm wheel drives the screw rod and rotates, and the steering nut who overlaps on the screw rod is reciprocating motion along the screw rod, and when the steering nut was equipped with the one end motion of worm wheel towards the screw rod cover, first stopper supported and leaned on first baffle, prevents that the steering nut excessive motion from bumping with the worm wheel, ensures bi-motor power assisted steering device normal work.

Description

Double-motor power-assisted steering device

Technical Field

The utility model relates to the technical field of power-assisted steering equipment, in particular to a double-motor power-assisted steering device.

Background

Along with the increasing exhaustion of energy sources, energy-saving and emission-reducing projects are more and more emphasized by the nation, the light weight is an effective way for reducing oil consumption in the automobile industry, the requirement for part strength is met, meanwhile, the effective reduction of the weight of parts is the trend of future part design, the design concept of light weight not only can meet the requirements for energy conservation and emission reduction and is beneficial to environmental protection, but also can reduce the material burden of consumers. However, the existing domestic double-motor steering gear is generally large in size, heavy in weight and high in oil consumption.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model provides a double-motor power-assisted steering device, which can effectively reduce the volume of the double-motor power-assisted steering device, prevent a steering nut from colliding with a worm wheel due to excessive movement and ensure the normal work of the double-motor power-assisted steering device, aiming at the technical problems that the double-motor steering device is large in size and heavy in weight generally.

2. Technical scheme

In order to solve the problems, the technical scheme provided by the utility model is as follows: the utility model provides a bi-motor power assisted steering device, includes casing, worm, the worm wheel with worm meshing, first bearing, second bearing, screw rod, steering nut, output shaft and motor, wherein: two ends of the worm are respectively connected with a motor; the worm wheel, the first bearing, the second bearing, the screw rod and the steering nut are all arranged in the shell; a first bearing, a worm wheel, a steering nut and a second bearing are sequentially sleeved from one end to the other end of the screw rod, and the steering nut is meshed with the output shaft; one side of the output shaft close to the worm wheel is provided with a first limiting block, and the shell is provided with a first baffle matched with the first limiting block.

Optionally, the vehicle speed control system further comprises a vehicle speed sensor and a controller, wherein the vehicle speed sensor is connected with the input end of the controller, and the output end of the controller is connected with the input end of the motor.

Optionally, the output shaft includes a shaft portion and a tooth portion, the tooth portion is arranged along the circumferential direction of the shaft portion, and a first limiting block is arranged on one side, close to the worm wheel, of the shaft portion.

Optionally, one side of the shaft portion close to the second bearing is provided with a second limiting block, and the shell is provided with a second baffle matched with the second limiting block.

Optionally, an inner nut is sleeved on the screw rod, the steering nut is sleeved on the periphery of the inner nut, and a gap is formed between the inner nut and the steering nut.

Optionally, the inner nut comprises a first body and a first limiting plate which is arranged at two ends of the first body and is perpendicular to the first body, the steering nut comprises a second body and a second limiting plate which is arranged at two ends of the second body and is perpendicular to the second body, the outer side wall of the first limiting plate and the inner side wall of the second limiting plate are abutted against each other, and a gap is formed between the first body and the second body.

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

Optionally, a first rolling groove is formed between the screw rod and the inner nut, the ball rolls in the first rolling groove, a diverter is arranged between the screw rod and the inner nut, the diverter is provided with a second rolling groove for the ball to roll, and two ends of the second rolling groove are connected with the first rolling groove, so that the second rolling groove and the first rolling groove form a closed loop.

3. Advantageous effects

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

(1) the double-motor power-assisted steering device provided by the embodiment of the application has the advantages that the worm wheel is arranged in the shell and is positioned between the first bearing and the second bearing, the size of the double-motor power-assisted steering device can be effectively reduced, the worm drives the worm wheel to rotate, the worm wheel drives the screw rod to rotate, the steering nut sleeved on the screw rod reciprocates along the screw rod, when the steering nut moves towards one end of the screw rod sleeved with the worm wheel, the first limiting block is abutted against the first baffle plate to prevent the steering nut from colliding with the worm wheel due to excessive movement, the normal work of the double-motor power-assisted steering device is ensured, the worm is arranged in the shell to be possible, the two motors can respectively apply different power assistance to the worm to eliminate the gap between the worm and the worm wheel, the worm and the worm wheel are meshed together more tightly, the directional position consistency of the rear wheel is ensured, and when a vehicle steers at a low speed, the turning radius is small, and the rear wheel is stable when the steering wheel turns at high speed. The worm wheel is arranged between the first bearing and the second bearing, so that the bearing capacity of the worm wheel is enhanced, and the meshing stability of the worm wheel and the worm is enhanced.

Drawings

Fig. 1 is a schematic structural diagram of a dual-motor power steering apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram of a dual motor drive of the dual motor power steering apparatus according to the embodiment of the present invention.

Fig. 3 is a schematic view of a steering gear of a dual motor power steering apparatus according to an embodiment of the present invention.

The labels in the various figures are: 1. a housing; 101. a first baffle plate; 102. a second baffle; 2. a worm; 3. a worm gear; 4. a first bearing; 5. a second bearing; 6. a screw; 601. a first roll groove; 7. a steering nut; 701. a second body; 702. a second limiting plate; 8. an output shaft; 801. a shaft portion; 802. a tooth portion; 803. a first stopper; 804. a second limiting block; 9. a motor; 10. a vehicle speed sensor; 11. a controller; 12. an inner nut; 1201. a first body; 1202. a first limit plate; 13. a ball bearing; 14. a diverter; 1401. and a second rolling groove.

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 are not limiting of the utility model. 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

Referring to fig. 1 to 3, the dual-motor power steering apparatus of the present embodiment includes a housing 1, a worm 2, a worm wheel 3 engaged with the worm 2, a first bearing 4, a second bearing 5, a screw 6, a steering nut 7, an output shaft 8, and a motor, wherein: two ends of the worm 2 are respectively connected with a motor; the worm wheel 3, the first bearing 4, the second bearing 5, the screw rod 6 and the steering nut 7 are all arranged in the shell 1; a first bearing 4, a worm wheel 3, a steering nut 7 and a second bearing 5 are sequentially sleeved from one end to the other end of the screw rod 6, and the steering nut 7 is meshed with an output shaft 8; one side of the output shaft 8 close to the worm wheel 3 is provided with a first limiting block 803, and the shell 1 is provided with a first baffle 10 and a motor 1 matched with the first limiting block. The worm wheel 3 is arranged in the shell 1 and positioned between the first bearing 4 and the second bearing 5, the size of the double-motor power-assisted steering device can be effectively reduced, the worm 2 drives the worm wheel 3 to rotate, the worm wheel 3 drives the screw rod 6 to rotate, the steering nut 7 sleeved on the screw rod 6 reciprocates along the screw rod 6, when the steering nut 7 moves towards one end of the screw rod 6 sleeved with the worm wheel 3, the first limiting block 803 abuts against the first baffle 10 motor 1 to prevent the steering nut 7 from colliding with the worm wheel 3 in excessive movement, the normal work of the double-motor power-assisted steering device is ensured, the worm is arranged in the shell 1 to be possible, the two motors can respectively apply different assistance to the worm 2 to eliminate the gap between the worm 2 and the worm wheel 3, the worm 2 and the worm wheel 3 are meshed together more tightly, the directional position consistency of the rear wheel is ensured, and when a vehicle steers at a low speed, the turning radius is small, and the rear wheel is stable when the steering wheel turns at high speed. The worm wheel 3 is arranged between the first bearing 4 and the second bearing 5, so that the bearing capacity of the worm wheel 3 is enhanced, and the meshing stability of the worm wheel 3 and the worm 2 is enhanced.

Example 2

With reference to fig. 1 to 3, compared with the technical solution of embodiment 1, the dual-motor power steering apparatus of the present embodiment can be improved as follows: the vehicle speed sensor is connected with the input end of the controller, and the output end of the controller is connected with the input end of the motor. When the automobile steering wheel turns to, the automobile speed sensor transmits an automobile speed signal to the controller, the controller controls the motors arranged at two ends of the worm 2 respectively according to the automobile speed information, the two motors apply different forces to the worm 2 respectively, the gap between the worm 2 and the worm wheel 3 is eliminated, the worm 2 and the worm wheel 3 are meshed together more tightly, and the consistency of the pointing positions of the wheels is ensured.

Example 3

With reference to fig. 1 to 3, compared with the technical solutions of embodiments 1 and 2, the dual-motor power steering apparatus of the present embodiment can be improved as follows: the output shaft 8 includes a shaft portion 801 and a tooth portion 802, the tooth portion 802 is disposed along a circumferential direction of the shaft portion 801, and a first stopper 803 is disposed on a side of the shaft portion 801 close to the worm wheel 3. The worm 2 drives the worm wheel 3 to rotate, the worm wheel 3 drives the screw rod 6 to rotate, the steering nut 7 sleeved on the screw rod 6 reciprocates along the screw rod 6, when the steering nut 7 moves towards one end of the screw rod 6, which is sleeved with the worm wheel 3, the first limiting block 803 is abutted against the first baffle 10 on the motor 1, the steering nut 7 is prevented from excessively moving and colliding with the worm wheel 3, and the normal work of the double-motor power-assisted steering device is ensured.

Example 4

With reference to fig. 1 to 3, the dual-motor power steering apparatus of the present embodiment can be improved as follows, compared with any of the technical solutions of embodiments 1 to 3: a second limit block 804 is arranged on one side of the shaft portion 801 close to the second bearing 5, and the casing 1 is provided with a second baffle 102 matched with the second limit block 804. When the steering nut 7 moves towards one end of the screw rod 6, which is sleeved with the second bearing 5, the second limiting block 804 abuts against the second baffle 102, so that the steering nut 7 is prevented from excessively moving and colliding with the second bearing 5, and the normal work of the dual-motor power-assisted steering device is ensured.

Example 5

With reference to fig. 1 to 3, the dual-motor power steering apparatus of the present embodiment can be improved as follows, compared with any of the technical solutions of embodiments 1 to 4: an inner nut 12 is sleeved on the screw rod 6, the steering nut 7 is sleeved on the periphery of the inner nut 12, and a gap is formed between the inner nut 12 and the steering nut 7. When the output shaft 8 applies a reaction force to the steering nut 7, the steering nut 7 is forced to move towards the radial direction, and the gap is formed between the steering nut 7 and the inner nut 12, so that the inner nut 12 arranged inside the steering nut 7 is not subjected to the action of the radial force, and the threaded rod 6 is prevented from being forced to deform.

Example 6

With reference to fig. 1 to 3, the dual-motor power steering apparatus of the present embodiment can be improved as follows, compared with any of the technical solutions of embodiments 1 to 5: the inner nut 12 comprises a first body 1201 and first limiting plates 1202 which are arranged at two ends of the first body 1201 and are perpendicular to the first body 1201, the steering nut 7 comprises a second body 701 and second limiting plates 702 which are arranged at two ends of the second body 701 and are perpendicular to the second body 701, the outer side wall of the first limiting plate 1202 and the inner side wall of the second limiting plate 702 abut against each other, and a gap is formed between the first body 1201 and the second body 701. The outer side wall of the first limiting plate 1202 and the inner side wall of the second limiting plate 702 abut against each other, so that the inner nut 12 is fixed inside the steering nut 7, and axial displacement between the inner nut 12 and the steering nut 7 is avoided.

Example 7

With reference to fig. 1 to 3, the dual-motor power steering apparatus of the present embodiment can be improved as follows, compared with any of the technical solutions of embodiments 1 to 6: and a ball 13 is arranged between the screw rod 6 and the inner nut 12. The balls 13 change the sliding friction between the screw 6 and the inner nut 12 into rolling friction, reducing the resistance to movement.

Example 8

With reference to fig. 1 to 3, the dual-motor power steering apparatus of the present embodiment can be improved as follows, compared with any of the technical solutions of embodiments 1 to 7: a first rolling groove 601 is formed between the screw rod 6 and the inner nut 12, the ball 13 rolls in the first rolling groove 601, a deflector 14 is arranged between the screw rod 6 and the inner nut 12, the deflector 14 is provided with a second rolling groove 1401 for rolling the ball 13, and two ends of the second rolling groove 1401 are connected with the first rolling groove 601, so that the second rolling groove 1401 and the first rolling groove 601 form a closed loop. The ball 13 enters the second rolling groove 1401 from the first rolling groove 601, and the second rolling groove 1401 and the first rolling groove 601 form a closed loop, so that the ball 13 reciprocates in the closed loop, and the ball 13 is prevented from moving along the first rolling groove 601 all the time and rolling out of the screw 6, and the transmission effect is prevented from being influenced.

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 utility model, 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 utility model.

Claims

1. The utility model provides a bi-motor power assisted steering device which characterized in that, includes casing, worm, the worm wheel with worm meshing, first bearing, second bearing, screw rod, steering nut, output shaft and motor, wherein:

two ends of the worm are respectively connected with a motor;

the worm wheel, the first bearing, the second bearing, the screw rod and the steering nut are all arranged in the shell;

a first bearing, a worm wheel, a steering nut and a second bearing are sequentially sleeved from one end to the other end of the screw rod, and the steering nut is meshed with the output shaft;

one side of the output shaft close to the worm wheel is provided with a first limiting block, and the shell is provided with a first baffle matched with the first limiting block.

2. The dual motor power steering apparatus of claim 1, further comprising a vehicle speed sensor and a controller, wherein the vehicle speed sensor is connected to an input of the controller, and an output of the controller is connected to an input of the motor.

3. The dual motor power steering apparatus according to claim 1, wherein the output shaft includes a shaft portion and a tooth portion, the tooth portion is disposed along a circumferential direction of the shaft portion, and a first stopper is disposed on a side of the shaft portion adjacent to the worm wheel.

4. The dual motor power steering apparatus of claim 3, wherein a second stopper is disposed on a side of the shaft portion adjacent to the second bearing, and the housing has a second stopper engaged with the second stopper.

5. The dual-motor power steering device according to claim 1, wherein the screw is sleeved with an inner nut, the steering nut is sleeved on the outer periphery of the inner nut, and a gap is formed between the inner nut and the steering nut.

6. The dual-motor power steering device according to claim 5, wherein the inner nut comprises a first body and first limiting plates which are arranged at two ends of the first body and are perpendicular to the first body, the steering nut comprises a second body and second limiting plates which are arranged at two ends of the second body and are perpendicular to the second body, an outer side wall of each first limiting plate and an inner side wall of each second limiting plate abut against each other, and a gap is formed between the first body and the second body.

7. The dual motor power steering apparatus of claim 5, wherein balls are disposed between the screw and the inner nut.

8. The dual motor power steering apparatus of claim 7, wherein a first rolling groove is formed between the screw and the inner nut, the balls roll in the first rolling groove, a steering gear is disposed between the screw and the inner nut, the steering gear has a second rolling groove in which the balls roll, and both ends of the second rolling groove are connected to the first rolling groove such that the second rolling groove and the first rolling groove form a closed loop.