CN110723203A - Electro-hydraulic steering gear and automobile - Google Patents

Abstract

The invention provides an electro-hydraulic steering gear and an automobile. Wherein, electro-hydraulic steering gear includes: the hydraulic power-assisted steering device can realize hydraulic power-assisted steering when an input shaft of the hydraulic power-assisted steering device rotates; a motor-assisted steering device; the clutch device is arranged between the output end of the motor power-assisted steering device and the input shaft, the output end of the motor power-assisted steering device can be selectively in transmission connection or disconnection with the input shaft, when the output end of the motor power-assisted steering device is in transmission connection with the input shaft of the hydraulic power-assisted steering device, the input shaft rotates, and the motor power-assisted steering of the hydraulic power-assisted steering device is realized by outputting power through the motor power-assisted steering device. According to the technical scheme, the electro-hydraulic steering gear can simultaneously realize hydraulic power-assisted steering and motor power-assisted steering, and when the motor power-assisted steering device is abnormal, the electro-hydraulic steering gear can still normally steer in a hydraulic power-assisted state, an auxiliary device is not required to be additionally arranged, the structure is simpler, and the cost is favorably reduced.

Description

Electro-hydraulic steering gear and automobile

Technical Field

The invention relates to the technical field of automobile steering, in particular to an electro-hydraulic steering gear and an automobile.

Background

At present, in a common electro-hydraulic steering gear, a worm and gear structure is mostly adopted between an output shaft of a motor and an input shaft of the steering gear to realize transmission connection, but when an electric control unit breaks down or is abnormal, the worm and gear structure generates large steering resistance and even self-locking, so that steering is heavy and even the steering cannot be performed, and normal running of a vehicle is influenced. In the prior art, a scheme of adopting a standby motor exists, but the scheme can lead the structure and the connection of the steering gear to be more complicated, the volume is increased, the utilization rate of the standby motor is low, and the overall cost of the steering gear is increased.

Disclosure of Invention

The present invention is directed to improving at least one of the technical problems of the prior art or the related art.

To this end, it is an object of the present invention to provide an electro-hydraulic steering gear.

Another object of the present invention is to provide an automobile.

In order to achieve the above object, a first aspect of the present invention provides an electro-hydraulic steering gear, including: the hydraulic power-assisted steering device can realize hydraulic power-assisted steering when an input shaft of the hydraulic power-assisted steering device rotates; a motor-assisted steering device; the clutch device is arranged between the output end of the motor power-assisted steering device and the input shaft, the output end of the motor power-assisted steering device can be selectively in transmission connection or disconnection with the input shaft, when the output end of the motor power-assisted steering device is in transmission connection with the input shaft of the hydraulic power-assisted steering device, the input shaft rotates, and the motor power-assisted steering of the hydraulic power-assisted steering device is realized by outputting power through the motor power-assisted steering device.

According to the technical scheme of the first aspect of the invention, the electro-hydraulic steering gear comprises a hydraulic power steering gear, a motor power steering device and a clutch device. The hydraulic power steering gear is provided with an input shaft and is used for receiving external steering driving force, and when the driving force is input to the hydraulic power steering gear through the input shaft, the hydraulic power steering gear can realize hydraulic power steering. Through being equipped with motor power assisted steering device and clutch, and through clutch, the output of motor power assisted steering device is connected or the disconnection with the input shaft transmission of hydraulic power assisted steering ware selectively to when the input shaft of hydraulic power assisted steering ware rotated, be connected with the input shaft transmission of hydraulic power assisted steering ware through the output of motor power assisted steering device, to hydraulic power assisted steering ware output power, make hydraulic power assisted steering ware realize motor power assisted steering, thereby make the steering operation process more laborsaving. When the motor power-assisted steering device is abnormal, the input shaft of the hydraulic power-assisted steering device can be disconnected with the output end of the motor power-assisted steering device, so that the hydraulic power-assisted steering device can still steer through hydraulic power under the condition of being separated from the motor power-assisted steering device, a vehicle provided with the electric-hydraulic steering device can continue to run, the midway anchoring is avoided, and the motor power-assisted steering device is overhauled when the vehicle arrives at a maintenance station. The electro-hydraulic steering gear can simultaneously realize hydraulic power steering and motor power steering, is independent of the motor power steering and the hydraulic power steering, does not need to be additionally provided with an auxiliary device, can realize that the electro-hydraulic steering gear continues to keep the steering power when the motor power steering device is abnormal, is simple to operate, and is favorable for reducing the cost.

It should be noted that, in the existing electro-hydraulic steering gear, when the electronic control device is abnormal, the internal transmission device generates a large resistance, even self-locking occurs, which results in an increase in the steering resistance, even no steering, and the vehicle cannot normally run, especially when the motor assistance is suddenly abnormal during the high-speed running of the vehicle, a large potential safety hazard is generated.

In addition, the electro-hydraulic steering gear in the technical scheme provided by the invention can also have the following additional technical characteristics:

in the above technical scheme, the clutch device includes a worm and a worm wheel, the worm is connected with the output end of the motor power-assisted steering device, the worm wheel is sleeved on the input shaft, the worm wheel is meshed with the worm, and the transmission connection between the output end of the motor power-assisted steering device and the input shaft is realized through the meshing between the worm wheel and the worm, wherein the worm wheel can move along the axial direction of the input shaft to be close to or far away from the worm, so that the input shaft is disconnected from the output end of the motor power-assisted steering device through the axial movement of the worm wheel.

In the technical scheme, the clutch device comprises a worm wheel and a worm, the worm is connected with the output end of the motor power-assisted steering device, the worm wheel is sleeved on an input shaft of the hydraulic power-assisted steering device, and the motor power-assisted steering device is in transmission connection with the input shaft through meshing between the worm wheel and the worm so as to provide steering power for the hydraulic power-assisted steering device through the meshed worm wheel and the meshed worm in the operation process of the electric-hydraulic steering device. The worm wheel can move along the axial direction of the input shaft by limiting, so that when the motor power-assisted steering device is abnormal, the worm wheel moves axially to be separated from the worm, the motor power-assisted steering device is disconnected with the hydraulic power-assisted steering device, and the phenomenon that the operation of the hydraulic power-assisted steering device is affected due to locking or jamming between the worm wheel and the worm is prevented.

In the above technical solution, the clutch device further includes: the electromagnetic coil is wound on the outer side of the input shaft in the radial direction, and a radial distance exists between the electromagnetic coil and the input shaft; the armature is arranged between the input shaft and the electromagnetic coil, and when the electromagnetic coil is electrified, the magnetic force generated by the electromagnetic coil drives the armature to move along the axial direction of the input shaft, so that the armature pushes the worm wheel to move, and the engagement or separation of the worm wheel and the worm is realized.

In this solution, the clutch device further comprises an electromagnetic coil and an armature. The electromagnetic coil is wound on the outer side of the input shaft of the hydraulic power steering gear in the radial direction, a radial distance exists between the electromagnetic coil and the input shaft, and the armature is arranged in the distance between the electromagnetic coil and the input shaft so that the armature corresponds to the electromagnetic coil. The electromagnetic coil is electrified to generate magnetic force to drive the armature to move along the axial direction of the input shaft, and the armature pushes the worm wheel to move axially, so that the engagement or the separation of the worm wheel and the worm is realized. The scheme only needs to operate the electrification or the power failure of the electromagnetic coil, is simple and convenient to operate and is easy to realize. Alternatively, the armature is of cylindrical construction, with the input shaft passing through a hollow portion within the armature.

It is emphasized that the direction of movement of the solenoid and armature varies depending on the relative position of the armature and worm gear. The electromagnetic coil and the armature can be arranged between the worm wheel and the hydraulic power steering gear, and also can be arranged at one end of the worm wheel far away from the hydraulic power steering gear, when the electromagnetic coil is electrified, the armature moves towards the worm wheel, and the worm wheel is pushed to move axially. Optionally, the armature can push the worm wheel to move and separate from the worm, and can also push the worm wheel to be meshed with the worm, so that the technical effect of the scheme can be realized.

In the above technical solution, the clutch device further includes: the two thrust bearings are sleeved outside the input shaft and are respectively arranged at two ends of the worm wheel along the axial direction of the input shaft; the pre-tightening spring is sleeved on the outer side of the input shaft, one end of the pre-tightening spring abuts against a thrust bearing arranged at one end, far away from the armature, of the worm wheel, the other end of the pre-tightening spring abuts against the input shaft, when the electromagnetic coil is powered on, the worm wheel is meshed with the worm under the pushing of the armature, the worm wheel compresses the pre-tightening spring through the thrust bearing, and when the electromagnetic coil is powered off, the elastic force of the pre-tightening spring pushes the thrust bearing and the worm wheel to move, so that the worm wheel is separated from the worm.

In the technical scheme, the clutch device further comprises two thrust bearings and a pre-tightening spring. The outside of input shaft is located to two thrust bearing covers, and locate the worm wheel respectively along the both ends of the axial direction of input shaft, in order when armature along axial displacement under solenoid's magnetic drive, bear the axial effort of armature through thrust bearing, and then promote the worm wheel along axial displacement, can avoid armature and worm wheel direct contact, the reduction causes the impact to the worm wheel, simultaneously accessible thrust bearing makes the even transmission of the driving force of armature to the worm wheel, be favorable to improving the stability of worm wheel at the axial displacement in-process. The pre-tightening spring is sleeved outside the input shaft, one end of the pre-tightening spring abuts against the thrust bearing, the other end of the pre-tightening spring abuts against the input shaft, the armature pushes the worm wheel to move axially under the driving of the electromagnetic coil, and when the worm wheel is meshed with the worm, the pre-tightening spring is compressed, so that the pre-tightening spring generates pre-tightening force and has a movement trend of restoring the original state, when the electromagnetic coil is powered off, the thrust bearing and the worm wheel are pushed by the elastic force of the pre-tightening spring to move towards the direction far away from the pre-tightening spring along the axial direction of the input shaft, the worm wheel is separated from the worm, and the motor power-assisted steering device is disconnected from the hydraulic.

In the technical scheme, the input shaft is provided with the thrust part, the thrust part extends outwards along the radial direction of the input shaft, and one end, far away from the thrust bearing, of the pre-tightening spring is abutted to the thrust part.

In the technical scheme, the thrust part extending outwards along the radial direction is arranged on the input shaft, and one end, far away from the thrust bearing, of the pre-tightening spring is abutted against the thrust part, so that the pre-tightening spring is compressed under the action of the worm wheel and the thrust bearing, and pre-tightening force is generated. Meanwhile, the worm wheel, the thrust bearing and the pre-tightening spring can be axially limited.

In the technical scheme, the outer side wall of the input shaft is provided with the external spline, the inner side wall of the worm wheel is provided with the internal spline matched with the external spline, and the input shaft and the worm wheel are in transmission connection through the matching of the external spline and the internal spline.

In the technical scheme, the outer spline is arranged on the outer side wall of the input shaft, the inner spline matched with the outer spline is arranged on the inner side wall of the worm wheel, the input shaft and the worm wheel are in transmission connection through the matching of the outer spline and the inner spline, the worm wheel and the input shaft rotate simultaneously, and the assistance is formed through the rotation of the worm wheel and the worm which are meshed with each other on the input shaft. When the electro-hydraulic steering gear operates normally, the worm drives the worm wheel to rotate in the same direction as the input shaft.

In the above technical solution, the input shaft further includes: the shaft hole is arranged in the input shaft and is coaxially arranged with the input shaft; and one end of the torsion bar extends into the shaft hole and is fixedly connected with the input shaft, the other end of the torsion bar extends out of the input shaft, and the torsion bar is used for receiving steering driving force input from the outside.

In this technical solution, the input shaft further includes a shaft hole and a torsion bar. The shaft hole is arranged in the input shaft along the axial direction of the input shaft and is coaxial with the input shaft. One end of the torsion bar extends into the shaft hole and is fixedly connected with the input shaft, and the other end of the torsion bar extends out from one end of the input shaft, which is far away from the hydraulic power steering gear, and is used for receiving steering driving force input from the outside. Specifically, when the electro-hydraulic steering gear is assembled on a vehicle, the torsion bar is in transmission connection with a steering operation system of the vehicle so as to control and operate the electro-hydraulic steering gear through the steering operation system.

In a second aspect of the present invention, an automobile is provided, including: a vehicle body having a steering operation device and a steering wheel; according to the technical scheme of the first aspect, the electro-hydraulic steering gear is arranged in a vehicle body, an input shaft of a hydraulic power steering gear in the electro-hydraulic steering gear is in transmission connection with a steering operation device, and an output end of the hydraulic power steering gear is connected with a steering wheel, so that when the steering operation device is operated, the electro-hydraulic steering gear drives the steering wheel to steer.

According to a second aspect of the invention, an automobile comprises a body and an electro-hydraulic steering gear according to any one of the first aspect. Wherein, the vehicle body is provided with a steering operation device and a steering wheel; the steering operation device is in transmission connection with an input shaft of a hydraulic power steering gear in the electro-hydraulic steering gear, and particularly, the steering operation device is in transmission connection with the input shaft through a torsion bar of the input shaft; the output end of a hydraulic power-assisted steering gear in the electro-hydraulic steering gear is connected with a steering wheel of a vehicle body so as to control the electro-hydraulic steering gear to operate through a steering operation device and drive the steering wheel to steer, so that the automobile realizes electric control and hydraulic dual power-assisted steering. Particularly, when the motor power-assisted steering device of the electro-hydraulic steering gear is abnormal, the hydraulic power-assisted steering gear can still normally operate, and the electro-hydraulic steering gear can still realize hydraulic power-assisted steering, so that the normal running of an automobile is ensured. In addition, the automobile in the scheme should have all the beneficial effects of the electro-hydraulic steering gear in any one of the above-mentioned first aspect technical solutions, and details are not repeated herein.

In the above technical solution, the automobile further includes: the controller is arranged in the vehicle body and electrically connected with the electro-hydraulic steering gear, and the controller is used for controlling the connection state between an input shaft of a hydraulic power steering gear in the electro-hydraulic steering gear and the motor power steering gear according to the working state of the motor power steering gear in the electro-hydraulic steering gear.

In the technical scheme, a controller is further arranged in the vehicle body and is electrically connected with the electro-hydraulic steering gear through the controller, so that the connection state between an input shaft of a hydraulic power steering gear in the electro-hydraulic steering gear and the motor power steering gear is controlled according to the working state of the motor power steering gear. Specifically, the controller can control the worm wheel of the motor power-assisted steering device to move axially to enable the worm wheel to be meshed with or separated from the worm, and when the controller receives an abnormal signal of the motor power-assisted steering device, the controller controls the worm wheel to be separated from the worm, so that the input shaft of the hydraulic power-assisted steering device in the electro-hydraulic steering device is disconnected with the output end of the motor power-assisted steering device, the hydraulic power-assisted steering device of the electro-hydraulic steering device can continue to operate under the condition of being separated from the motor power-assisted steering device, and hydraulic power assistance can still be achieved. Alternatively, the controller may be a vehicle controller of the automobile, or may be an independent electrohydraulic steering controller.

In the technical scheme, the automobile further comprises an operating platform which is arranged in the automobile body, the operating platform is electrically connected with the controller, and a control instruction can be sent to the controller through the operating platform so as to control the operation of the electro-hydraulic steering gear.

In the technical scheme, an operation table is arranged in the vehicle body and is electrically connected with the controller, so that manual operation is performed on the operation table, manual instructions are sent to the controller, and the connection state between the hydraulic power steering gear of the electro-hydraulic steering gear and the motor power steering device is controlled. Optionally, the console is provided in the cab of the vehicle for the driver to operate. Further, the console may be integrated into the dashboard of the vehicle or may be a separate operating device.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 illustrates a partial cross-sectional view of an electro-hydraulic diverter according to one embodiment of the present invention;

FIG. 2 shows a schematic view of section A of FIG. 1;

FIG. 3 illustrates a partial cross-sectional view of an electro-hydraulic diverter according to one embodiment of the present invention;

FIG. 4 shows a schematic view of section B of FIG. 3;

FIG. 5 illustrates a partial cross-sectional view of an electro-hydraulic diverter according to one embodiment of the present invention;

FIG. 6 shows a schematic view of section C of FIG. 5;

FIG. 7 illustrates a partial cross-sectional view of an electro-hydraulic diverter according to one embodiment of the present invention;

fig. 8 shows a schematic view of portion D of fig. 7.

Wherein, the correspondence between the reference numbers and the components in fig. 1 to 8 is as follows:

the hydraulic power steering device comprises a hydraulic power steering device 1, an input shaft 11, a shaft hole 111, a torsion bar 112, a thrust part 113, a motor power steering device 2, an output end 22, a clutch device 3, a worm wheel 31, a worm 32, an electromagnetic coil 33, an armature 34, a first thrust bearing 351, a second thrust bearing 352 and a pre-tightening spring 36.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Electro-hydraulic steering gears and automobiles according to some embodiments of the present invention are described below with reference to fig. 1-8.

Example one

The embodiment provides an electro-hydraulic steering gear, as shown in fig. 1, which comprises a hydraulic power steering gear 1, a motor power steering device 2 and a clutch device 3. The hydraulic power steering apparatus 1 has an input shaft 11, and the hydraulic power steering apparatus 1 can perform hydraulic power steering when the input shaft 11 rotates. Motor power steering device 2 is connected on hydraulic power steering 1, motor power steering device 2 has output 22, clutch 3 locates between hydraulic power steering 1 and motor power steering device 2, and motor power steering device 2's output 22 is connected with hydraulic power steering 1's input shaft 11 transmission through clutch 3, in order when hydraulic power steering 1's input shaft 11 rotates, accessible motor power steering device 2 is to hydraulic power steering 1 input torque, promote the rotation of input shaft 11, realize hydraulic power steering 1's motor power steering, thereby make electric hydraulic power steering can realize hydraulic power steering and motor power steering simultaneously. The input shaft 11 of the hydraulic power steering device 1 can be selectively in transmission connection or disconnection connection with the output end 22 of the motor power steering device 2, when the motor power steering device 2 is abnormal, the input shaft 11 of the hydraulic power steering device 1 is separated from the output end 22 of the motor power steering device 2, so that the hydraulic power steering device 1 is disconnected from the motor power steering device 2, the hydraulic power steering device 1 can still normally operate in a state of being separated from the motor power steering device 2, hydraulic power steering can be achieved, and the phenomenon that the abnormal motor power steering device 2 has an obstruction effect on the operation of the hydraulic power steering device 1 is avoided.

Example two

The embodiment provides an electro-hydraulic steering gear, as shown in fig. 1, which comprises a hydraulic power steering gear 1, a motor power steering device 2 and a clutch device 3. The hydraulic power steering gear 1 is provided with an input shaft 11, when the input shaft 11 rotates, the hydraulic power steering gear 1 can realize hydraulic power steering, and meanwhile, the electric hydraulic power steering gear can also realize motor power steering through the motor power steering gear 2 and the clutch device 3. Specifically, as shown in fig. 2, the motor power steering apparatus 2 is connected to the hydraulic power steering apparatus 1, the motor power steering apparatus 2 has an output end 22, and the clutch apparatus 3 is provided between the hydraulic power steering apparatus 1 and the motor power steering apparatus 2; the clutch device 3 comprises a worm wheel 31 and a worm 32, the worm wheel 31 is sleeved on the input shaft 11 of the hydraulic power steering gear 1, the worm wheel 31 is connected with the input shaft 11, the worm 32 is connected with the output end 22 of the motor power steering gear 2, the worm wheel 31 is meshed with the worm 32, transmission connection between the input shaft 11 of the hydraulic power steering gear 1 and the output end 22 of the motor power steering gear 2 is achieved, when the input shaft 11 drives the worm wheel 31 to rotate, torque is output to the worm wheel 31 through rotation of the worm 32, rotation of the worm wheel 31 and the input shaft 11 is further promoted, and steering power assistance to the hydraulic power steering gear 1 is achieved. The worm wheel 31 can move along the axial direction of the input shaft 11, when the motor power steering device 2 is abnormal, the worm wheel 31 and the worm 32 can be separated through the axial movement of the worm wheel 31, the meshing state is removed, the input shaft 11 of the hydraulic power steering device 1 is disconnected with the output end 22 of the motor power steering device 2, the worm wheel 31 and the worm 32 are prevented from being self-locked or jammed to block the rotation of the worm wheel 31, the hydraulic power steering device 1 can continue to operate under the state of being separated from the motor power steering device 2, and the hydraulic power steering device can still achieve hydraulic power steering. When the electro-hydraulic steering gear is assembled on a vehicle, even if the motor power-assisted steering device 2 is abnormal, the electro-hydraulic steering gear can still realize normal steering through hydraulic power assistance, so that the normal running of the vehicle is ensured.

EXAMPLE III

The embodiment provides an electro-hydraulic steering gear, as shown in fig. 3, which comprises a hydraulic power steering gear 1, a motor power steering device 2 and a clutch device 3. The hydraulic power steering gear 1 is provided with an input shaft 11, when the input shaft 11 rotates, the hydraulic power steering gear 1 can realize hydraulic power steering, and meanwhile, the electric hydraulic power steering gear can also realize motor power steering through the motor power steering gear 2 and the clutch device 3.

As shown in fig. 4, the motor power steering apparatus 2 is connected to the hydraulic power steering apparatus 1, the motor power steering apparatus 2 has an output end 22, and the clutch apparatus 3 is provided between the hydraulic power steering apparatus 1 and the motor power steering apparatus 2; the clutch device 3 comprises a worm wheel 31 and a worm 32, the worm wheel 31 is sleeved on the input shaft 11 of the hydraulic power steering gear 1, the worm wheel 31 is connected with the input shaft 11, the worm 32 is connected with the output end 22 of the motor power steering gear 2, the worm wheel 31 is meshed with the worm 32, so that when the input shaft 11 drives the worm wheel 31 to rotate, torque is output to the worm wheel 31 through rotation of the worm 32, rotation of the worm wheel 31 and the input shaft 11 is further promoted, and steering assistance to the hydraulic power steering gear 1 is achieved. The clutch device 3 further comprises an electromagnetic coil 33, an armature 34, a first thrust bearing 351, a second thrust bearing 352 and a pretension spring 36. The electromagnetic coil 33 is wound around the input shaft 11 in the radial direction, and is located between the worm wheel 31 and the hydraulic power steering apparatus 1, and a radial distance exists between the electromagnetic coil 33 and the input shaft 11. The armature 34 is a hollow cylindrical structure, and is sleeved on the radial outer side of the input shaft 11, the armature 34 is located in the radial distance between the electromagnetic coil 33 and the input shaft 11, and a radial gap exists between the inner wall surface of the armature 34 and the outer wall surface of the input shaft 11. Both ends of the worm wheel 31 in the axial direction are provided with a first thrust bearing 351 and a second thrust bearing 352, respectively, wherein the first thrust bearing 351 is located between the armature 34 and the worm wheel 31, and the second thrust bearing 352 is located at one end of the worm wheel 31 away from the armature 34. The input shaft 11 has one end corresponding to the second thrust bearing 352 formed with a thrust portion 113, the thrust portion 113 extends outward in the radial direction of the input shaft 11, and both ends of the biasing spring 36 respectively abut against the thrust portion 113 and the second thrust bearing 352.

When the electro-hydraulic power steering gear normally operates, the electromagnetic coil 33 is electrified, the electromagnetic coil 33 generates magnetic force, the armature 34 moves in the direction close to the worm wheel 31 along the axial direction under the action of the magnetic force of the electromagnetic coil 33, the armature 34 is in contact with the first thrust bearing 351, and then the first thrust bearing 351, the worm wheel 31 and the second thrust bearing 352 are pushed to move in the direction away from the hydraulic power steering gear 1, so that the worm wheel 31 is meshed with the worm 32, the transmission connection between the input shaft 11 of the hydraulic power steering gear 1 and the output end 22 of the motor power steering gear 2 is realized, and the motor power steering of the hydraulic power steering gear 1 is realized through the output power of the worm 32; meanwhile, the second thrust bearing 352 compresses the pre-tightening spring 36, so that the pre-tightening spring 36 generates pre-tightening force and has a movement tendency of recovering to the original state. When the motor power steering device 2 is abnormal, the worm 32 cannot normally rotate, at the moment, the electromagnetic coil 33 is powered off, the magnetic force disappears, the pre-tightening spring 36 releases the pre-tightening force, and pushes the second thrust bearing 352 and the worm wheel 31 to move towards the direction close to the hydraulic power steering device 1, so that the worm wheel 31 is separated from the worm 32, the hydraulic power steering device 1 is disconnected from the motor power steering device 2, the hydraulic power steering device 1 can still normally operate, and hydraulic power steering can be realized. When the electro-hydraulic steering gear is assembled on a vehicle, even if the motor power-assisted steering device 2 is abnormal, the electro-hydraulic steering gear can still realize normal steering through hydraulic power assistance, so that the normal running of the vehicle is ensured.

Example four

The embodiment provides an electro-hydraulic steering gear, as shown in fig. 5, which comprises a hydraulic power steering gear 1, a motor power steering device 2 and a clutch device 3. The hydraulic power steering gear 1 is provided with an input shaft 11, when the input shaft 11 rotates, the hydraulic power steering gear 1 can realize hydraulic power steering, and meanwhile, the electric hydraulic power steering gear can also realize motor power steering through the motor power steering gear 2 and the clutch device 3.

Specifically, as shown in fig. 6, the input shaft 11 of the hydraulic power steering 1 is provided with a shaft hole 111 in the axial direction, and the shaft hole 111 is provided coaxially with the input shaft 11. The input shaft 11 further comprises a torsion bar 112, one end of the torsion bar 112 extends into the shaft hole 111, the torsion bar 112 is fixedly connected with the input shaft 11, and the other end of the torsion bar 112 is provided with one end of the shaft hole 111, which is far away from the hydraulic power steering gear 1, and extends out, so that when the electro-hydraulic steering gear is assembled with a vehicle, one end of the torsion bar 112 extending out of the shaft hole 111 is connected with a steering operation system to receive steering driving force, and the steering driving force is transmitted through the input shaft 11 to enable the electro-hydraulic steering gear to operate. The motor power-assisted steering device 2 is connected to the hydraulic power-assisted steering device 1, the motor power-assisted steering device 2 is provided with an output end 22, and the clutch device 3 is arranged between the hydraulic power-assisted steering device 1 and the motor power-assisted steering device 2; the clutch device 3 comprises a worm wheel 31 and a worm 32, the worm wheel 31 is sleeved on the input shaft 11 of the hydraulic power steering gear 1, the worm wheel 31 is connected with the input shaft 11, and the worm 32 is connected with the output end 22 of the motor power steering gear 2. Wherein, be equipped with the external splines on the lateral wall of input shaft 11, be equipped with on the inside wall of worm wheel 31 with external splines matched with internal splines, cooperate with internal splines through the external splines, realize that the transmission between worm wheel 31 and the input shaft 11 is connected. The worm wheel 31 is engaged with the worm 32 to realize transmission connection between the input shaft 11 of the hydraulic power steering gear 1 and the output end 22 of the motor power steering gear 2, so that when the input shaft 11 drives the worm wheel 31 to rotate, the rotation of the worm 32 outputs torque to the worm wheel 31, the rotation of the worm wheel 31 and the input shaft 11 is further promoted, and the steering power of the hydraulic power steering gear 1 is realized.

In addition, the worm wheel 31 can move along the axial direction of the input shaft 11, when the motor power steering device 2 is abnormal, the worm wheel 31 and the worm 32 can be separated through the axial movement of the worm wheel 31, the meshing state is released, the input shaft 11 of the hydraulic power steering device 1 is disconnected with the output end 22 of the motor power steering device 2, the worm wheel 31 and the worm 32 are prevented from being self-locked or jammed to block the rotation of the worm wheel 31, the hydraulic power steering device 1 can continue to operate under the state of being separated from the motor power steering device 2, and the hydraulic power steering can still be realized. When the electro-hydraulic steering gear is assembled on a vehicle, even if the motor power-assisted steering device 2 is abnormal, the electro-hydraulic steering gear can still realize normal steering through hydraulic power assistance, so that the normal running of the vehicle is ensured.

EXAMPLE five

The embodiment provides an electro-hydraulic steering gear, as shown in fig. 7, which comprises a hydraulic power steering gear 1, a motor power steering device 2 and a clutch device 3. The hydraulic power steering gear 1 is provided with an input shaft 11, when the input shaft 11 rotates, the hydraulic power steering gear 1 can realize hydraulic power steering, and meanwhile, the electric hydraulic power steering gear can also realize motor power steering through the motor power steering gear 2 and the clutch device 3.

As shown in fig. 8, the input shaft 11 of the hydraulic power steering 1 is provided with a shaft hole 111 in the axial direction, and the shaft hole 111 is provided coaxially with the input shaft 11. The input shaft 11 further comprises a torsion bar 112, one end of the torsion bar 112 extends into the shaft hole 111, the torsion bar 112 is fixedly connected with the input shaft 11, and the other end of the torsion bar 112 is provided with one end of the shaft hole 111, which is far away from the hydraulic power steering gear 1, and extends out, so that when the electro-hydraulic steering gear is assembled with a vehicle, one end of the torsion bar 112 extending out of the shaft hole 111 is connected with a steering operation system to receive steering driving force, and the steering driving force is transmitted through the input shaft 11 to enable the electro-hydraulic steering gear to operate. The motor power-assisted steering device 2 is connected to the hydraulic power-assisted steering device 1, the motor power-assisted steering device 2 is provided with an output end 22, and the clutch device 3 is arranged between the hydraulic power-assisted steering device 1 and the motor power-assisted steering device 2; the clutch device 3 comprises a worm wheel 31 and a worm 32, the worm wheel 31 is sleeved on the input shaft 11 of the hydraulic power steering gear 1, the worm wheel 31 is connected with the input shaft 11, and the worm 32 is connected with the output end 22 of the motor power steering gear 2. Wherein, be equipped with the external splines on the lateral wall of input shaft 11, be equipped with on the inside wall of worm wheel 31 with external splines matched with internal splines, cooperate with internal splines through the external splines, realize that the transmission between worm wheel 31 and the input shaft 11 is connected. The worm wheel 31 is engaged with the worm 32, so that when the input shaft 11 drives the worm wheel 31 to rotate, the rotation of the worm 32 outputs a torque to the worm wheel 31, further promoting the rotation of the worm wheel 31 and the input shaft 11, and realizing the steering assistance of the hydraulic power steering device 1. The clutch device 3 further comprises an electromagnetic coil 33, an armature 34, a first thrust bearing 351, a second thrust bearing 352 and a pretension spring 36. The electromagnetic coil 33 is wound around the input shaft 11 in the radial direction, and is located between the worm wheel 31 and the hydraulic power steering apparatus 1, and a radial distance exists between the electromagnetic coil 33 and the input shaft 11. The armature 34 is a hollow cylindrical structure, and is sleeved on the radial outer side of the input shaft 11, the armature 34 is located in the radial distance between the electromagnetic coil 33 and the input shaft 11, and a radial gap exists between the inner wall of the armature 34 and the outer wall of the input shaft 11. Both ends of the worm wheel 31 in the axial direction are provided with a first thrust bearing 351 and a second thrust bearing 352, respectively, wherein the first thrust bearing 351 is located between the armature 34 and the worm wheel 31, and the second thrust bearing 352 is located at one end of the worm wheel 31 away from the armature 34. The input shaft 11 has one end corresponding to the second thrust bearing 352 formed with a thrust portion 113, the thrust portion 113 extends outward in the radial direction of the input shaft 11, and both ends of the biasing spring 36 respectively abut against the thrust portion 113 and the second thrust bearing 352.

When the electro-hydraulic power steering gear normally operates, the electromagnetic coil 33 is electrified, the electromagnetic coil 33 generates magnetic force, the armature 34 moves in the direction close to the worm wheel 31 along the axial direction under the action of the magnetic force of the electromagnetic coil 33, the armature 34 is in contact with the first thrust bearing 351, and then the first thrust bearing 351, the worm wheel 31 and the second thrust bearing 352 are pushed to move in the direction away from the hydraulic power steering gear 1, so that the worm wheel 31 is meshed with the worm 32, the transmission connection between the input shaft 11 of the hydraulic power steering gear 1 and the output end 22 of the motor power steering gear 2 is realized, and the motor power steering of the hydraulic power steering gear 1 is realized through the output power of the worm 32; meanwhile, the second thrust bearing 352 compresses the pre-tightening spring 36, so that the pre-tightening spring 36 generates pre-tightening force and has a movement tendency of recovering to the original state. When the motor power steering device 2 is abnormal, the worm 32 cannot normally rotate, the electromagnetic coil 33 is powered off, the magnetic force disappears, the pre-tightening spring 36 releases pre-tightening force at the moment, and pushes the second thrust bearing 352 and the worm wheel 31 to move towards the direction close to the hydraulic power steering device 1, so that the worm wheel 31 is separated from the worm 32, the input shaft 11 of the hydraulic power steering device 1 is disconnected with the output end 22 of the motor power steering device 2, the hydraulic power steering device 1 can still normally operate, and hydraulic power steering can be realized. When the electro-hydraulic steering gear is assembled on a vehicle, even if the motor power-assisted steering device 2 is abnormal, the electro-hydraulic steering gear can still realize normal steering through hydraulic power assistance, so that the normal running of the vehicle is ensured.

EXAMPLE six

The embodiment provides an automobile which comprises an automobile body and the electro-hydraulic steering gear in any one of the first embodiment to the fifth embodiment. Wherein, the vehicle body is provided with a steering operation device and a steering wheel; the steering operation device is in transmission connection with an input shaft 11 of a hydraulic power steering gear 1 in the electro-hydraulic steering gear, and particularly, the steering operation device is in transmission connection with the input shaft 11 through a torsion bar 112 of the input shaft 11; the output end of a hydraulic power-assisted steering device 1 in the electro-hydraulic steering device is connected with a steering wheel of a vehicle body. The electric-hydraulic steering gear is controlled to operate through the steering operation device, the steering wheel is driven to steer, so that the automobile has hydraulic power assistance and motor power assistance in the steering process, and the steering operation is more labor-saving. Particularly, when the motor power-assisted steering device 2 of the electro-hydraulic steering gear is abnormal, the electro-hydraulic steering gear can still realize hydraulic power-assisted steering, and the normal running of the automobile is ensured. In addition, the automobile in the scheme should have all the beneficial effects of the electro-hydraulic steering gear in any one of the first to fifth embodiments, and details are not repeated herein.

EXAMPLE seven

The embodiment provides an automobile which comprises an automobile body, a controller and the electro-hydraulic steering gear in any one of the first embodiment to the fifth embodiment. Wherein, the vehicle body is provided with a steering operation device and a steering wheel; the steering operation device is in transmission connection with the input shaft 11 in the electro-hydraulic steering gear, and particularly, the steering operation device is in transmission connection with the input shaft 11 through a torsion bar 112 of the input shaft 11; the output end of the electro-hydraulic steering gear is connected with a steering wheel of the vehicle body. The electric-hydraulic steering gear is controlled to operate through the steering operation device, the steering wheel is driven to steer, so that the automobile has hydraulic power assistance and motor power assistance in the steering process, and the steering operation is more labor-saving. The controller is electrically connected with the electro-hydraulic steering gear to control the connection state between the input shaft 11 of the hydraulic power steering gear 1 and the output end 22 of the motor power steering gear 2 according to the working state of the motor power steering gear 2 in the electro-hydraulic steering gear. Specifically, when the controller receives an abnormal signal of the motor power steering device 2, the controller controls the worm wheel 31 of the clutch device 3 to axially move, so that the worm wheel 31 is separated from the worm 32, the input shaft 11 of the electro-hydraulic steering device is disconnected from the output end 22 of the motor power steering device 2, the hydraulic power steering device 1 of the electro-hydraulic steering device can continue to operate under the condition of being separated from the motor power steering device 2, and hydraulic power steering can still be realized, so that normal running and steering of an automobile are ensured. Wherein, the controller is the vehicle control unit of car.

Further, an operating device is arranged in an instrument desk of the automobile, the operating device is electrically connected with the vehicle control unit, and manual operation can be performed on the operating device to send a manual instruction to the vehicle control unit so as to control the connection state between the input shaft 11 of the hydraulic power steering 1 and the output end 22 of the motor power steering 2.

In addition, the automobile in the scheme should have all the beneficial effects of the electro-hydraulic steering gear in any one of the first to fifth embodiments, and details are not repeated herein.

The technical scheme of the invention is explained in detail by combining the drawings, the electro-hydraulic steering gear can simultaneously realize hydraulic power-assisted steering and motor power-assisted steering, and when the motor power-assisted steering device is abnormal, the electro-hydraulic steering gear can still normally steer in a hydraulic power-assisted state without additionally adding an auxiliary device, so that the change of the whole volume of the electro-hydraulic steering gear is small, the structure is simple, the implementation is easy, and the cost is reduced.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An electro-hydraulic steering gear, comprising:

the hydraulic power steering system comprises a hydraulic power steering gear (1), wherein the hydraulic power steering gear (1) can realize hydraulic power steering when an input shaft (11) of the hydraulic power steering gear (1) rotates;

a motor power steering device (2);

the clutch device (3) is arranged between an output end (22) of the motor power-assisted steering device (2) and the input shaft (11), the output end (22) of the motor power-assisted steering device (2) can be selectively in transmission connection or disconnection with the input shaft (11), when the output end (22) of the motor power-assisted steering device (2) is in transmission connection with the input shaft (11) of the hydraulic power-assisted steering device, the input shaft (11) rotates, and the motor power-assisted steering of the hydraulic power-assisted steering device (1) is realized through the power output of the motor power-assisted steering device (2).

2. The electro-hydraulic steering gear of claim 1,

the clutch device (3) comprises a worm (32) and a worm wheel (31), the worm (32) is connected with the output end (22) of the motor power-assisted steering device (2), the worm wheel (31) is sleeved on the input shaft (11), the worm wheel (31) is meshed with the worm (32), the output end (22) of the motor power-assisted steering device (2) is in transmission connection with the input shaft (11) through the meshing between the worm wheel (31) and the worm wheel (32),

wherein the worm wheel (31) is movable in the axial direction of the input shaft (11) to approach or separate from the worm (32), the disconnection of the input shaft (11) from the output (22) of the electric motor assisted steering (2) being achieved by the axial movement of the worm wheel (31).

3. Electro-hydraulic steering gear according to claim 2, characterized in that the clutch device (3) further comprises:

the electromagnetic coil (33) is wound on the outer side of the input shaft (11) in the radial direction, and a radial distance exists between the electromagnetic coil (33) and the input shaft (11);

an armature (34) provided between the input shaft (11) and the electromagnetic coil (33),

when the electromagnetic coil (33) is electrified, the magnetic force generated by the electromagnetic coil (33) drives the armature (34) to move along the axial direction of the input shaft (11), so that the armature (34) pushes the worm wheel (31) to move, and the worm wheel (31) is meshed with or separated from the worm (32).

4. Electro-hydraulic steering gear according to claim 3, characterized in that the clutch device (3) further comprises:

the two thrust bearings are sleeved on the outer side of the input shaft (11) and are respectively arranged at two ends of the worm wheel (31) along the axial direction of the input shaft (11);

the pre-tightening spring (36) is sleeved on the outer side of the input shaft (11), one end of the pre-tightening spring (36) abuts against a thrust bearing arranged at one end, far away from the armature (34), of the worm wheel (31), the other end of the pre-tightening spring (36) abuts against the input shaft (11),

when the electromagnetic coil (33) is electrified, the worm wheel (31) is meshed with the worm (32) under the pushing of the armature (34), the worm wheel (31) compresses the pre-tightening spring (36) through the thrust bearing, and when the electromagnetic coil (33) is electrified, the elastic force of the pre-tightening spring (36) pushes the thrust bearing and the worm wheel (31) to move, so that the worm wheel (31) is separated from the worm (32).

5. The electro-hydraulic steering gear of claim 4,

the input shaft (11) is provided with a thrust part (113), the thrust part (113) extends outwards along the radial direction of the input shaft (11), and one end, far away from the thrust bearing, of the pre-tightening spring (36) is abutted to the thrust part (113).

6. The electro-hydraulic steering gear of claim 2,

be equipped with the external splines on the lateral wall of input shaft (11), be equipped with on the inside wall of worm wheel (31) with external splines matched with internal splines, input shaft (11) with worm wheel (31) pass through the external splines with the cooperation of internal splines realizes the transmission and is connected.

7. The electro-hydraulic steering gear according to any one of claims 1-6, characterized in that the input shaft (11) further comprises:

the shaft hole (111) is arranged in the input shaft (11), and the shaft hole (111) and the input shaft (11) are coaxially arranged;

one end of the torsion bar (112) extends into the shaft hole (111) and is fixedly connected with the input shaft (11), the other end of the torsion bar (112) extends out of the input shaft (11), and the torsion bar (112) is used for receiving steering driving force input from the outside.

8. An automobile, comprising:

a vehicle body having a steering operation device and a steering wheel;

the electro-hydraulic steering gear according to any one of claims 1 to 7, disposed in the vehicle body, wherein an input shaft of a hydraulic power steering gear in the electro-hydraulic steering gear is in transmission connection with the steering operation device, and an output end of the hydraulic power steering gear is connected with the steering wheel, so that the electro-hydraulic steering gear drives the steering wheel to steer when the steering operation device is operated.

9. The automobile of claim 8, further comprising:

the controller is arranged in the vehicle body and electrically connected with the electro-hydraulic steering gear, and the controller is used for controlling the connection state between the input shaft and the output end of the motor power-assisted steering gear according to the working state of the motor power-assisted steering gear in the electro-hydraulic steering gear.

10. The automobile of claim 9, further comprising:

the operation panel is arranged in the vehicle body and electrically connected with the controller, and a control instruction can be sent to the controller through the operation panel to control the operation of the electro-hydraulic steering gear.

Images