CN219904498U - Electric power steering device and vehicle - Google Patents

Abstract

The utility model discloses an electric power steering gear and a vehicle, the electric power steering gear comprises: a housing; the input shaft and the gear shaft are rotatably arranged on the shell, and the input shaft is connected with the gear shaft through a torsion bar; the motor comprises a stator and a rotor, the stator and the shell are relatively fixed, the rotor is rotatably arranged in the stator, and the rotor is connected with a hollow motor shaft and is sleeved outside the gear shaft; the control module is suitable for controlling the rotor to rotate relative to the stator when the input shaft inputs torque and outputting power to the gear shaft through a harmonic speed reducing mechanism. According to the electric power steering gear, the motor and the gear shaft can share the axial installation space, the whole occupied space is small, the force is transferred between the rotor and the gear shaft through the harmonic speed reducing mechanism, the structure is simple, the installation is convenient, and the force transfer is more stable.

Description

Electric power steering device and vehicle

Technical Field

The utility model relates to the technical field of vehicles, in particular to an electric power steering gear and a vehicle with the electric power steering gear.

Background

In the related art, the existing single-pinion electric power steering gear has complex assembly process, higher cost and larger occupation of the whole space, and particularly, the design of a worm-worm speed reducing mechanism is adopted, so that the processing cost is higher, and the improvement space exists.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide an electric power steering apparatus that has a simple structure, is convenient to install, occupies a small space as a whole, and is low in design cost.

An electric power steering apparatus according to an embodiment of the present utility model includes: a housing; the input shaft and the gear shaft are rotatably arranged on the shell, and the input shaft is connected with the gear shaft through a torsion bar; the motor comprises a stator and a rotor, the stator and the shell are relatively fixed, the rotor is rotatably arranged in the stator, and the rotor is connected with a hollow motor shaft and is sleeved outside the gear shaft; the control module is suitable for controlling the rotor to rotate relative to the stator when the input shaft inputs torque and outputting power to the gear shaft through a harmonic speed reducing mechanism.

According to the electric power steering gear disclosed by the embodiment of the utility model, the motor and the gear shaft can share the axial installation space, the whole occupied space is small, the force transmission is carried out between the rotor and the gear shaft through the harmonic speed reducing mechanism, the structure is simple, the installation is convenient, and the stability of the force transmission is better.

According to the electric power steering gear of some embodiments of the present utility model, the harmonic reduction mechanism includes a harmonic generator and an assembly, the harmonic generator is connected to the rotor, the assembly is sleeved outside the harmonic generator, and the harmonic generator is adapted to drive the gear shaft to rotate through the assembly.

According to the electric power steering gear of some embodiments of the present utility model, a gear ring is arranged in the housing, the gear ring is sleeved outside the assembly body, the assembly body comprises an inner pin, a sliding block and an outer pin, the sliding block is sleeved outside the harmonic generator, the inner pin is mounted between the sliding block and the harmonic generator in a rolling manner, and the outer pin is mounted between the sliding block and the gear ring in a rolling manner; the harmonic generator is configured in an oval shape and is adapted to push the fitting body when the rotor rotates so that the outer stud is pushed into the groove of the ring gear and the sliding block is in power connection with the gear shaft.

An electric power steering apparatus according to some embodiments of the present utility model further includes a holder, the gear shaft is connected with a support plate, the holder is located between the sliding block and the support plate, and the sliding block is adapted to transmit power to the support plate through the holder.

According to the electric power steering gear of some embodiments of the present utility model, the number of the inner pins is plural, and the plural inner pins are distributed in sequence in the circumferential direction of the harmonic generator; the outer pins are multiple, and the outer pins are distributed in sequence on the circumference of the sliding block.

According to the electric power steering gear of some embodiments of the present utility model, an elastic deep groove ball bearing is arranged between the assembly body and the harmonic generator, and the elastic deep groove ball bearing is axially fixed to the harmonic generator through a rivet and a locking plate.

According to some embodiments of the utility model, the control module is mounted within the housing.

According to some embodiments of the utility model, the control module comprises a controller, a torque sensor and a sensor magnetic ring, wherein the torque sensor is arranged on the input shaft, the sensor magnetic ring is arranged on the gear shaft, and the controller is positioned in the shell and is in communication connection with the torque sensor.

According to the electric power steering gear of some embodiments of the present utility model, the housing includes a shielding cover, a sensor housing, a motor housing and a speed reduction mechanism housing, the shielding cover, the sensor housing and the motor housing are sequentially and fixedly connected, the input shaft rotatably penetrates through the shielding cover and the sensor housing, the gear shaft rotatably penetrates through the motor housing and the speed reduction mechanism housing, the control module is located in the sensor housing, the motor is located in the motor housing, and the harmonic speed reduction mechanism is located in the speed reduction mechanism housing.

The utility model further provides a vehicle.

According to the vehicle of the embodiment of the present utility model, the electric power steering apparatus of any one of the embodiments described above is provided.

The vehicle and the electric power steering gear described above have the same advantages over the prior art and are not described in detail herein.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an electric power steering gear (without a main housing and a drive rack) according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view at A-A in FIG. 1;

FIG. 3 is a schematic view of an electric power steering gear according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view at B-B in FIG. 3;

fig. 5 is a top view of an electric power steering gear of an embodiment of the utility model.

Reference numerals:

the electric power steering gear 100,

cage 11, sensor housing 12, motor housing 13, reduction gear housing 14, main housing 15, ring gear 16,

input shaft 21, torsion bar 22, cylindrical pin 23, gear shaft 24,

a stator 31, a rotor 32, a controller 33, a torque sensor 34, a sensor magnet ring 35, a hollow motor shaft 36,

the harmonic generator 41, the inner stud pin 42, the sliding block 43, the outer stud pin 44, the retainer 45, the supporting disk 46, the driving rack 47, the ball pin pull rod 48, the ball pin seat 49,

a coupling 51, an elastic deep groove ball bearing 52, rivets 53, and a locking plate 54.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

An electric power steering apparatus 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 5, and the electric power steering apparatus 100 is simple in assembly, compact in assembly structure, small in required installation space, and low in overall part cost and design cost.

As shown in fig. 1 to 5, an electric power steering apparatus 100 according to an embodiment of the present utility model includes: a housing, an input shaft 21, a gear shaft 24, a motor and a control module.

The input shaft 21 and the gear shaft 24 are rotatably mounted to the housing, that is, the input shaft 21 and the gear shaft 24 are both mounted to the housing and rotatable with respect to the housing, wherein the input shaft 21 and the gear shaft 24 are connected by the torsion bar 22, and as shown in fig. 2, the input shaft 21 and the gear shaft 24 are both extended in the up-down direction, and the lower end of the input shaft 21 and the upper end of the gear shaft 24 are connected by the torsion bar 22 by the cylindrical pin 23. It will be appreciated that the input shaft 21 is connected to the steering column, torque is input towards the input shaft 21 when the steering wheel rotates, the input shaft 21 drives the gear shaft 24 to rotate after a certain torsion is generated by the torsion bar 22, and when torque is input to the input shaft 21, a torque signal transmitted by the torsion bar 22 can be detected and transmitted to the motor controller, and electric power is output to the gear shaft 24 through motor speed reduction and torque increase.

The motor comprises a stator 31 and a rotor 32, wherein the stator 31 is relatively fixed with the shell, the stator 31 is externally connected with a power supply, so that the stator 31 can be selectively electrified, and the rotor 32 is rotatably arranged in the stator 31, so that after the stator 31 is electrified, the rotor 32 rotates relative to the stator 31 and the shell under the action of magnetic force. And the rotor 32 is connected with the hollow motor shaft 36 and is sleeved outside the gear shaft 24, so that the stator 31 and the rotor 32 of the motor can share the axial space with the gear shaft 24, a compact design is realized, the occupation of the space is reduced, and the volume of the electric power steering gear 100 is reduced.

The control module is adapted to control the rotation of the rotor 32 relative to the stator 31 and to output power to the gear shaft 24 via the harmonic reduction mechanism when torque is input by the input shaft 21, i.e. the rotor 32 of the motor is in power connection with the gear shaft 24 via the harmonic reduction mechanism. Thus, when the user turns the steering wheel, the control module controls the stator 31 of the motor to be electrified, and drives the rotor 32 to rotate after the electrification, the rotor 32 transmits driving torque to the harmonic speed reducing mechanism, and the harmonic speed reducing mechanism reduces the power of the rotor 32 to increase the torque and then outputs the power to the gear shaft 24, so that electric power assistance is realized.

Wherein, carry out power connection through harmonic reduction gears between rotor 32 and gear shaft 24, the assembly method is simple, and the installation space that occupies is less, and required design cost is lower.

According to the electric power steering gear 100 of the embodiment of the utility model, the motor and the gear shaft 24 can share the installation space in the axial direction, the whole occupied space is small, the force transmission is carried out between the rotor 32 and the gear shaft 24 through the harmonic speed reducing mechanism, the structure is simple, the installation is convenient, and the stability of the force transmission is better.

As shown in fig. 2, the harmonic reduction mechanism comprises a harmonic generator 41 and an assembly, wherein the rotor 32 is positioned in the stator 31, a hollow motor shaft 36 is arranged in the rotor 32, the hollow motor shaft 36 is rotatably sleeved outside the gear shaft 24, a coupler 51 is arranged at the end part of the hollow motor shaft 36, and the coupler 51 is connected with the harmonic generator 41, so that the power on the rotor 32 can be transmitted to the harmonic generator 41 through the hollow motor shaft 36 and the coupler 51.

The assembly is sleeved outside the harmonic generator 41, and the harmonic generator 41 is suitable for driving the gear shaft 24 to rotate through the assembly, so that when the rotor 32 drives the harmonic generator 41 to rotate, the harmonic generator 41 drives the assembly to rotate, the assembly drives the gear shaft 24 to rotate in the rotating process, power output is further achieved, and through the cooperation of the harmonic generator 41 and the assembly, the effects of reducing speed and increasing torque can be achieved, and the power assisting effect on the gear shaft 24 is enhanced. The assembly is sleeved outside the harmonic generator 41, so that the assembly and the motor can share the axial space and are distributed in multiple layers in the radial direction, the integration level of the electric power steering gear 100 is greatly improved, and the space occupation is reduced.

The electric power assisting device acts on the gear shaft 24 through the harmonic speed reducing mechanism, so that the steering efficiency is improved to a certain extent, more vehicle type ranges with different weights can be covered, and intelligent driving can be better supported. And, the harmonic generator 41 can be rotatably supported by the elastic deep groove ball bearing 52, and the elastic deep groove ball bearing 52 is axially fixed to the harmonic generator 41 by the rivet 53 and the locking plate 54, so that the space occupied by parts is effectively reduced.

In some embodiments, the gear ring 16 is disposed in the housing, the gear ring 16 is sleeved outside the assembly, wherein the assembly includes an inner pin 42, a sliding block 43 and an outer pin 44, the sliding block 43 is sleeved outside the harmonic generator 41, the inner pin 42 is mounted between the sliding block 43 and the harmonic generator 41 in a rolling manner, and the outer pin 44 is mounted between the sliding block 43 and the gear ring 16 in a rolling manner.

Wherein the harmonics generator 41 is configured in an oval shape and adapted to push the assembly as the rotor 32 rotates such that the outer post pins 44 push into the slots of the ring gear 16 and the sliding blocks 43 are in power connection with the gear shaft 24. In other words, during actual operation, the rotor 32 drives the harmonic generator 41 to rotate, and the cam of the harmonic generator 41 is used to press against the assembly body during rotation, so that the assembly body moves outwards, and the sliding block 43 can power the gear shaft 24, so that the gear shaft 24 can be driven to move to realize electric assistance.

Specifically, the engagement points of the harmonic generator 41 are always symmetrical about the central axis, and the axial and radial forces are balanced, which is beneficial for prolonging the service life.

In some embodiments, the electric power steering apparatus 100 further includes a retainer 45, the gear shaft 24 is connected with a support disc 46, the retainer 45 is located between the sliding block 43 and the support disc 46, and the sliding block 43 is adapted to transmit power to the support disc 46 through the retainer 45, as shown in fig. 2, the retainer 45 is located at an end of the sliding block 43, and the support disc 46 is sleeved on an outer peripheral wall of the gear shaft 24, and the support disc 46 is rigidly connected with the gear shaft 24, so that when the rotor 32 outputs power, the power can be transmitted to the gear shaft 24 through the harmonic generator 41, the sliding block 43, the retainer 45 and the support disc 46.

In some embodiments, the inner pins 42 are plural, and the plural inner pins 42 are sequentially distributed in the circumferential direction of the harmonics generator 41, the outer pins 44 are plural, and the plural outer pins 44 are sequentially distributed in the circumferential direction of the sliding block 43. As shown in fig. 4, a plurality of inner pins 42 are disposed around the harmonic generator 41, that is, rolling engagement can be performed by a plurality of inner pins 42 in the circumferential direction between the harmonic generator 41 and the sliding block 43, and a plurality of outer pins 44 are disposed around the sliding block 43, that is, rolling engagement can be performed by a plurality of outer pins 44 in the circumferential direction between the sliding block 43 and the ring gear 16, whereby friction force between the sliding block 43 and the harmonic generator 41 and between the sliding block 43 and the ring gear 16 can be greatly reduced, transmission efficiency can be improved, and mechanism bearing torque can be further improved.

The gear ring 16 may be fixedly connected to the housing, for example, the gear ring 16 and the housing are assembled and fixed by welding, interference, or spline, so as to fix the gear ring 16 to the housing.

In some embodiments, as shown in fig. 2, an elastic deep groove ball bearing 52 is disposed between the assembly and the harmonic generator 41, and the elastic deep groove ball bearing 52 is axially fixed to the harmonic generator 41 by a rivet 53 and a locking plate 54, so that the position of the elastic deep groove ball bearing 52 is stable, and the assembly can be stably supported on the outer side of the harmonic generator 41, and further stable and effective power transmission is ensured, and effective power assistance is realized. Wherein, through rivet 53 and locking plate 54's connection fixed, reduced spare part ratio space size effectively, realized the design of compactification, improved interior space utilization.

In some embodiments, the control module is installed in the housing, so that the control module can complete torque detection of the input shaft 21 and control of the motor in the housing, which is beneficial to reducing the setting of connecting lines, and the installation of the control module can well utilize the space in the housing, so that the space utilization in the housing is improved, the external space utilization is reduced, that is, the whole volume of the electric power steering gear 100 is well reduced, and the installation is convenient.

In some embodiments, the control module includes a controller 33, a torque sensor 34 and a sensor magnetic ring 35, the torque sensor 34 is disposed on the input shaft 21, the sensor magnetic ring 35 is disposed on the gear shaft 24, the controller 33 is disposed in the housing and is communicatively connected with the torque sensor 34, wherein when a user rotates the steering wheel, the input shaft 21 receives a certain resistance, the input shaft 21 and the gear shaft 24 generate a relatively small deformation through the torsion bar 22, so as to change the magnetic flux of the sensor magnetic ring 35, at this time, when the torque sensor 34 detects the magnetic flux change on the sensor magnetic ring 35, a detection signal can be sent to the controller 33, so that the controller 33 can perform power-on control on the stator 31 of the motor after receiving the control signal, so that the rotor 32 rotates relative to the stator 31, and further electric power is output.

Therefore, signals generated by the torque sensor 34 can be directly transmitted to the controller 33, so that the exposure of the external wire harness is reduced, and the damage of the external wire harness is avoided.

In some embodiments, the housing includes a cage 11, a sensor housing 12, a motor housing 13, and a reduction mechanism housing 14, where the cage 11, the sensor housing 12, and the motor housing 13 are fixedly connected in sequence, an input shaft 21 rotatably extends through the cage 11 and the sensor housing 12, a gear shaft 24 rotatably extends through the motor housing 13 and the reduction mechanism housing 14, a control module is located in the sensor housing 12, a motor is located in the motor housing 13, and a harmonic reduction mechanism is located in the reduction mechanism housing 14.

As shown in fig. 1 and 3, the isolation cover 11, the sensor housing 12 and the motor housing 13 are sequentially connected from top to bottom, the input shaft 21 is arranged at the isolation cover 11 and the sensor housing 12 in a penetrating manner, the upper end of the input shaft 21 extends out of the isolation cover 11, the gear shaft 24 is rotatably arranged at the motor housing 13 and the speed reduction mechanism housing 14 in a penetrating manner, the upper end of the gear shaft 24 extends into the sensor housing 12 and is connected with the input shaft 21, the control module is arranged at the sensor housing 12, the torque sensor 34 is arranged at the input shaft 21, the sensor magnetic ring 35 is arranged at the gear shaft 24, the rotor 32 and the stator 31 of the motor are sleeved outside the gear shaft 24, and all components of the harmonic speed reduction mechanism are arranged in the speed reduction mechanism housing 14.

The motor housing 13 is connected with the speed reducing mechanism housing 14 through four fastening bolts, the other end of the motor housing 13 is connected with the sensor housing 12 through two fastening bolts, and the isolation cover 11 is connected with the sensor housing 12, so that the housings can be connected into a whole, and the internal environment is relatively sealed.

In some embodiments, the electric power steering apparatus 100 further includes a driving rack 47 and a ball pin pull rod 48, where the ball pin pull rod 48 is two and connected to two ends of the driving rack 47, and the driving rack 47 is meshed with the gear shaft 24. Therefore, when the manual torque is input to the input shaft 21, the rotor 32 rotates relative to the stator 31 under the control of the controller 33, and then drives the gear shaft 24 to rotate, the gear shaft 24 is meshed with the transmission rack 47 and drives the transmission rack 47 to rotate, and the transmission rack 47 further drives the two ball pin pull rods 48 to rotate, so that the rotation boosting effect is realized. Wherein the ball pin pull rod 48 is connected with the transmission rack 47 through the ball pin seat 49.

The electric power steering gear 100 further includes a main housing 15, the driving rack 47 is installed in the main housing 15, and the two ball pin tie rods 48 are respectively located outside the main housing 15 at two ends of the driving rack 47, so as to realize external power transmission.

The utility model further provides a vehicle.

According to the vehicle of the embodiment of the utility model, the electric power steering gear 100 of any one of the embodiments is provided, the motor and the gear shaft 24 can share the installation space in the axial direction, the whole occupied space is small, the force transmission is carried out between the rotor 32 and the gear shaft 24 through the harmonic speed reducing mechanism, the structure is simple, the installation is convenient, and the stability of the force transmission is better.

1. In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

2. In the description of the utility model, a "first feature" or "second feature" may include one or more of such features.

3. In the description of the present utility model, "plurality" means two or more.

4. In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

5. In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An electric power steering apparatus, comprising:

a housing;

the input shaft and the gear shaft are rotatably arranged on the shell, and the input shaft is connected with the gear shaft through a torsion bar;

the motor comprises a stator and a rotor, the stator and the shell are relatively fixed, the rotor is rotatably arranged in the stator, and the rotor is connected with a hollow motor shaft and is sleeved outside the gear shaft;

the control module is suitable for controlling the rotor to rotate relative to the stator when the input shaft inputs torque and outputting power to the gear shaft through a harmonic speed reducing mechanism.

2. The electric power steering apparatus according to claim 1, wherein the harmonic reduction mechanism includes a harmonic generator and an assembly, the harmonic generator is connected to the rotor, the assembly is sleeved outside the harmonic generator, and the harmonic generator is adapted to drive the gear shaft to rotate through the assembly.

3. The electric power steering gear according to claim 2, wherein a gear ring is arranged in the housing, the gear ring is sleeved outside the assembly body, the assembly body comprises an inner pin, a sliding block and an outer pin, the sliding block is sleeved outside the harmonic generator, the inner pin is arranged between the sliding block and the harmonic generator in a rolling manner, and the outer pin is arranged between the sliding block and the gear ring in a rolling manner;

the harmonic generator is configured in an oval shape and is adapted to push the fitting body when the rotor rotates so that the outer stud is pushed into the groove of the ring gear and the sliding block is in power connection with the gear shaft.

4. An electric power steering gear according to claim 3, further comprising a cage, the gear shaft being connected with a support disc, the cage being located between the slider block and the support disc, and the slider block being adapted to transmit power to the support disc through the cage.

5. An electric power steering gear according to claim 3, wherein the number of the inner pins is plural, and the plural inner pins are distributed in turn in the circumferential direction of the harmonic generator;

the outer pins are multiple, and the outer pins are distributed in sequence on the circumference of the sliding block.

6. The electric power steering gear according to claim 2, wherein an elastic deep groove ball bearing is provided between the assembly body and the harmonic generator, and the elastic deep groove ball bearing is axially fixed to the harmonic generator by rivets and locking plates.

7. The electric power steering gear of claim 1, wherein the control module is mounted within the housing.

8. The electric power steering gear of claim 7, wherein the control module includes a controller, a torque sensor disposed on the input shaft, and a sensor magnet disposed on the gear shaft, the controller being located within the housing and communicatively coupled to the torque sensor.

9. The electric power steering apparatus according to claim 1, wherein the housing includes a cage, a sensor housing, a motor housing, and a speed reduction mechanism housing, the cage, the sensor housing, and the motor housing are fixedly connected in sequence, the input shaft rotatably penetrates the cage and the sensor housing, the gear shaft rotatably penetrates the motor housing and the speed reduction mechanism housing, the control module is located in the sensor housing, the motor is located in the motor housing, and the harmonic speed reduction mechanism is located in the speed reduction mechanism housing.

10. A vehicle characterized in that an electric power steering gear as claimed in any one of claims 1-9 is provided.