CN222347120U - An electronically controlled hydraulic power steering device - Google Patents

Abstract

The utility model discloses an electric control hydraulic power-assisted steering device, wherein the outside of an input shaft is connected with a steering wheel, the input shaft is connected with one end of a torsion bar, the other end of the torsion bar is connected with a connecting shaft, an intermediate shaft is further arranged on the connecting shaft, the input shaft, the connecting shaft and the intermediate shaft form a three-section structure, the three-section structure is good in assembly manufacturability, convenient and simple to assemble and disassemble and replace, and easy to operate.

Description

Electric control hydraulic power-assisted steering device

Technical Field

The utility model belongs to the technical field of steering gears, and relates to an electric control hydraulic power-assisted steering gear.

Background

The steering system controls the transverse movement of the automobile, and influences the steering stability, the active safety and the driving comfort of the whole automobile. An electro-hydraulic power steering system (EHPS) is added with a drive-by-wire part (a motor, an electric control and a speed reducing mechanism) on the basis of a traditional hydraulic power steering system (HPS), and is mainly applied to medium and heavy commercial vehicles.

Compared with the traditional HPS, the EHPS has the advantages of quicker steering response, lighter steering, variable power assisting speed, capability of actively correcting, capability of detecting faults and the like, can realize the auxiliary driving functions of lane keeping, automatic parking and the like, and is an important component of a steering system of a medium-heavy commercial vehicle in the future development direction. But the wire control part of the current EHPS system has poor assembly manufacturability and difficult assembly and disassembly.

Disclosure of utility model

Aiming at the problems in the prior art, the utility model provides an electric control hydraulic power steering gear, thereby solving the technical problems of poor assembly manufacturability and difficult assembly and disassembly and replacement of a drive-by-wire part of an EHPS system in the prior art.

The utility model is realized by the following technical scheme:

An electric control hydraulic power steering gear comprises a torsion bar;

An input shaft is arranged at one end of the torsion bar, and the outside of the input shaft is connected with a steering wheel;

the other end of the torsion bar is connected with a connecting shaft, and an intermediate shaft is arranged on the connecting shaft;

The sensor body of the electric control hydraulic power-assisted steering device is fixedly connected with the input shaft, and the magnetic ring of the electric control hydraulic power-assisted steering device is fixedly connected with the connecting shaft;

And the worm gear and the hydraulic input shaft of the electric control hydraulic power steering gear are connected with the intermediate shaft.

Preferably, the torsion bar is in interference fit with the input shaft, and the torsion bar is in interference fit with the connecting shaft.

Preferably, the torsion bar is in interference fit with the input shaft through a first connecting pin, and the torsion bar is in interference fit with the connecting shaft through a second connecting pin.

Preferably, the input shaft is in clearance fit with the connecting shaft.

Preferably, the connecting shaft is in clearance fit with the intermediate shaft.

Preferably, the inner wall of the input shaft is provided with a first limiting surface, the outer wall of the connecting shaft is provided with a second limiting surface, and when the electric control hydraulic power steering gear operates, the first limiting surface rotates in the circumferential range of the second limiting surface.

Preferably, the inner wall of the input shaft is further provided with a third limiting surface, the side wall of the connecting shaft is further provided with a fourth limiting surface, and when the electric control hydraulic power steering gear operates, the third limiting surface rotates in the circumferential range of the fourth limiting surface.

Preferably, the first limiting surface and the third limiting surface are symmetrically arranged, and the second limiting surface and the fourth limiting surface are symmetrically arranged.

Preferably, a fifth limiting surface is arranged on the outer side of the connecting shaft, a sixth limiting surface is arranged on the inner wall of the intermediate shaft, and the fifth limiting surface and the sixth limiting surface are matched.

Preferably, the sensor body is welded and fixed with the input shaft, and the magnetic ring is welded and fixed with the connecting shaft.

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

The utility model discloses an electric control hydraulic power-assisted steering device, wherein the outside of an input shaft is connected with a steering wheel, the input shaft is connected with one end of a torsion bar, the other end of the torsion bar is connected with a connecting shaft, an intermediate shaft is further arranged on the connecting shaft, the input shaft, the connecting shaft and the intermediate shaft form a three-section structure, the three-section structure is good in assembly manufacturability, convenient and simple to assemble and disassemble and replace, and easy to operate. And the worm wheel and the hydraulic input shaft of the electric control hydraulic power-assisted steering device are connected with the intermediate shaft, so that the steering function is finally realized.

Further, the torsion bar is in interference fit with the input shaft, and the torsion bar is in interference fit with the connecting shaft, so that rotation of the steering wheel can be better and completely transmitted to the input shaft.

Further, the input shaft and the connecting shaft are in clearance fit, so that the input shaft and the connecting shaft can rotate relatively.

Further, the connecting shaft is in clearance fit with the intermediate shaft, so that the rotating force between the connecting shaft and the intermediate shaft is easier to transfer.

Further, the inner wall of input shaft is equipped with first spacing face, the outer wall of connecting axle is equipped with the second spacing face, works as when automatically controlled hydraulic power assisted steering ware operates, first spacing face rotates in the circumference scope of second spacing face, the spacing protection architecture of torsion bar has effectively been constituted to the setting of first spacing face and second spacing face for the torsion bar is unlikely to damage because of limit operation.

Further, the inner wall of the input shaft is further provided with a third limiting surface, the side wall of the connecting shaft is further provided with a fourth limiting surface, and when the electric control hydraulic power steering gear operates, the third limiting surface rotates in the circumferential range of the fourth limiting surface, so that the protection of the torsion bar is further improved.

Further, the first limiting surface and the third limiting surface are symmetrically arranged, and the second limiting surface and the fourth limiting surface are symmetrically arranged, so that the stability of the device is better.

Further, the outer side of the connecting shaft is provided with a fifth limiting surface, the inner wall of the intermediate shaft is provided with a sixth limiting surface, and the fifth limiting surface and the sixth limiting surface are matched and arranged, so that the connecting shaft and the intermediate shaft cannot rotate relatively.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an electrically controlled hydraulic power steering system according to the present utility model;

FIG. 2 is a schematic diagram of a connection structure between an input shaft and a connecting shaft according to the present utility model;

Fig. 3 is a schematic diagram of a connection structure of a connecting shaft and an intermediate shaft in the present utility model.

The novel hydraulic pressure sensor comprises a torsion bar, 2, an input shaft, 3, a first connecting pin, 4, a first O-shaped ring, 5, a dust cover, 6, an upper cover, 7, a connecting shaft, 8, a sensor body, 9, a magnetic ring, 10, an intermediate shaft, 11, a worm gear partition plate, 12, a worm gear, 13, a first oil seal, 14, a hydraulic input shaft, 15, a wire control shell, 16, a connecting bolt, 17, a connecting ring, 18, a second connecting pin, 19, a second O-shaped ring, 20, a third O-shaped ring, 21, a first deep groove ball bearing, 22, a needle bearing, 23, a second deep groove ball bearing, 24, a shaft sleeve, 25, a second oil seal, A, a first welding position, B, a second welding position, a first connecting structure, B, a second connecting structure, 201, a first limiting surface, 701, a second limiting surface, 202, a third limiting surface, 702, a fourth limiting surface, 703, a fifth limiting surface, 101 and a sixth limiting surface.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present utility model, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or communicating between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is described in further detail below with reference to the attached drawing figures:

as shown in fig. 1, the utility model discloses an electric control hydraulic power-assisted steering device, which comprises a torsion bar 1, wherein one end of the torsion bar 1 is provided with an input shaft 2, the outside of the input shaft 2 is connected with a steering wheel, the other end of the torsion bar 1 is connected with a connecting shaft 7, an intermediate shaft 10 is arranged on the connecting shaft 7, a sensor body 8 of the electric control hydraulic power-assisted steering device is fixedly connected with the input shaft 2, a magnetic ring 9 of the electric control hydraulic power-assisted steering device is fixedly connected with the connecting shaft 7, and a worm gear 12 and a hydraulic input shaft 14 of the electric control hydraulic power-assisted steering device are both connected with the intermediate shaft 10.

In the preferred scheme, the sensor body 8 is welded and fixed with the input shaft 2, and the magnetic ring 9 is welded and fixed with the connecting shaft 7.

In another possible embodiment of the present utility model, the torsion bar 1 is in interference fit with the input shaft 2, and the torsion bar 1 is in interference fit with the connecting shaft 7, so that the rotating force of the steering wheel can be transmitted better and more fully. Specifically, the torsion bar 1 is in interference fit with the input shaft 2 through the first connecting pin 3, and the torsion bar 1 is in interference fit with the connecting shaft 7 through the second connecting pin 18.

Meanwhile, in a more preferred embodiment of the present utility model, the input shaft 2 is in clearance fit with the connecting shaft 7, and the main emphasis of the clearance fit is that the input shaft 2 and the connecting shaft 7 can rotate by a certain angle with respect to each other except for the fit mode of the region a in fig. 2, namely, the circular arc portion of the input shaft 2 and the connecting shaft 7. In addition, the connecting shaft 7 is in clearance fit with the intermediate shaft 10, and similarly, clearance fit refers to other contact positions except for the region b in fig. 3, namely, the arc-shaped part of the connecting shaft 7 and the intermediate shaft 10, and the clearance fit of the arc-shaped part can enable the rotating force between the connecting shaft 7 and the intermediate shaft 10 to be transmitted more easily.

In another preferred embodiment, as shown in fig. 2, the inner wall of the input shaft 2 is provided with a first limiting surface 201, the outer wall of the connecting shaft 7 is provided with a second limiting surface 701, and when the electric-controlled hydraulic power steering device operates, the first limiting surface 201 rotates within the circumferential range of the second limiting surface 701. More preferably, the side surface of the input shaft 2 is further provided with a third limiting surface 202, the inner wall of the connecting shaft 7 is further provided with a fourth limiting surface 702, and when the electric-controlled hydraulic power steering device operates, the third limiting surface 202 rotates in the circumferential range of the fourth limiting surface 702. The first limiting surface 201 and the third limiting surface 202 are symmetrically arranged, and the second limiting surface 701 and the fourth limiting surface 702 are symmetrically arranged. In a specific structure, the first limiting surface 201 and the third limiting surface 202 are formed by a plurality of side walls with different radians, and the radians of the first limiting surface 201 and the third limiting surface 202 are different from the main radian of the inner wall of the input shaft 2, so that the input shaft 2 can only rotate in the radian limited by the first limiting surface 201 and the third limiting surface 202, and the torsion bar protection effect is effectively achieved.

In another preferred embodiment, as shown in fig. 3, a fifth limiting surface 703 is disposed on the outer side of the connecting shaft 7, a sixth limiting surface 101 is disposed on the inner wall of the intermediate shaft 10, the fifth limiting surface 703 and the sixth limiting surface 101 are disposed in a matching manner, and the fifth limiting surface 703 and the sixth limiting surface 101 are both planar, and the two planes are disposed in a matching manner, so that the connecting shaft 7 and the intermediate shaft 10 cannot rotate relatively.

The utility model discloses an electric control hydraulic power-assisted steering device, wherein the outside of an input shaft is connected with a steering wheel, the input shaft is connected with one end of a torsion bar, the other end of the torsion bar is connected with a connecting shaft, an intermediate shaft is further arranged on the connecting shaft, the input shaft, the connecting shaft and the intermediate shaft form a three-section structure, and in the traditional process, the electric control hydraulic power-assisted steering device is of a two-section structure. In addition, the sensor body 8 of the electric control hydraulic power-assisted steering device is fixedly connected with the input shaft 2, the magnetic ring 9 of the electric control hydraulic power-assisted steering device is fixedly connected with the connecting shaft 7, namely, the sensor body and the magnetic ring of the torque angle sensor are arranged in a switching mode, the magnetic ring and the input shaft are welded in the traditional process, and the sensor body and the connecting shaft are welded in the traditional process, so that the assembly and the disassembly are more convenient due to the switching design. The worm gear 12 and the hydraulic input shaft 14 of the electric control hydraulic power steering gear are connected with the intermediate shaft 10, so that the steering function is finally realized. The torsion bar limiting protection structure is designed, so that the use safety and the use stability of the device are effectively ensured, and the device is not damaged due to limit operation.

Specifically, the assembly relation of the utility model is that one end of a torsion bar 1 is in interference fit with an input shaft 2 through a first connecting pin 3, the other end of the torsion bar 1 is in interference fit with a connecting shaft 7 through a second connecting pin 18, a first O-shaped ring 4 is sleeved on the upper part of the torsion bar 1, an inner hole of a dust cover 5 is in clearance fit with the input shaft 2, an outer ring of the dust cover 5 is in clearance fit with an upper cover 6, the connecting shaft 7 is in clearance fit with the input shaft 2 and can relatively rotate for a certain angle through a first connecting structure a (shown in fig. 2), a sensor body 8 is connected with the input shaft 2 into a whole through welding at a first welding position A, a magnetic ring 9 is connected with an intermediate shaft 10 into a whole through welding at a second welding position B, an outer ring of a worm gear baffle 11 is in clearance fit with a line control shell 15, an inner hole of the worm gear baffle 11 is in interference fit with a first deep groove ball bearing 21, an inner hole of the worm gear 12 is in interference fit with the intermediate shaft 10, a hydraulic input shaft 14 is in clearance fit with the intermediate shaft 10 through spline connection, a connecting bolt 16 is in threaded connection with the connecting shaft 7, the connecting shaft 7 is in locking structure a connecting ring 17, the connecting shaft 7 is in interference fit with the intermediate shaft 10 is in clearance fit with the second groove 2 through a second ball bearing 23, and can be in interference fit with the second deep groove ball bearing 23, and the second deep groove ball bearing is in clearance fit with the intermediate shaft 2 is in the second ball bearing 23, and the deep groove ball bearing is in clearance fit with the second ball bearing 23, and the deep groove 23 is in the deep groove ball bearing is in the deep groove 2 has the clearance fit between the deep groove ball bearing has the deep groove has the clearance fit between the deep ball bearing has the deep ball groove has the high clearance fit between the inside hole and the inside well.

The conventional design has only two-section structure of the input shaft 2 and the connecting shaft 7, and the magnetic ring 9 is welded with the input shaft 2, and the sensor body 8 is welded with the connecting shaft 7. The design has poor assembly manufacturability and difficult assembly and disassembly.

The design scheme is that an intermediate shaft 10 is added, a three-section structure is formed by the intermediate shaft 10, the input shaft 2, the connecting shaft 7 and other structures, the sensor body 8 is welded with the input shaft 2, the magnetic ring 9 is welded with the connecting shaft 7, and the sensor body 8 and the magnetic ring 9 of the torque rotation angle sensor are arranged in a reversing mode.

The working principle is briefly described:

One end of the torsion bar 1 is in interference fit with the input shaft 2 through a first connecting pin 3, the other end of the torsion bar 1 is in interference fit with the connecting shaft 7 through a second connecting pin 18, the outside of the upper end of the input shaft 2 is connected with a steering wheel through a steering control mechanism, when a steering wheel is driven by a hand of a person to rotate, the input shaft 2 drives the torsion bar 1 to synchronously rotate, the torsion bar 1 generates certain deformation relative to the connecting shaft 7, namely, angular displacement change occurs between the input shaft 2 and the connecting shaft 7, a sensor body 8 of a torque angle sensor is welded with the input shaft 2 into a whole, a magnetic ring 9 is welded with the connecting shaft 7 into a whole, so that angular displacement change occurs between the sensor body 8 and the magnetic ring 9, the angular displacement change is converted into an electric signal related to the torque angle sensor, the electric signal is embodied into torque and the angle of the steering wheel, the torque angle sensor transmits the electric signal to a controller ECU in real time, the controller controls the motor to rotate according to the received electric signal and a control logic, the ECU drives 12 to rotate after the motor is decelerated and the distance is increased through a worm, the 12 drives the intermediate shaft 10 and the hydraulic input shaft 14 to rotate together, the worm wheel 14 controls the worm wheel to work to finally realize the steering function. The three-section structure has good assembly manufacturability, and is convenient and simple to assemble and disassemble and easy to operate.

As shown in fig. 2, the input shaft 2 and the connecting shaft 7 are in clearance fit, and can relatively rotate by a certain angle through the first connecting structure a, and the angle is the deformation occurrence angle range of the torsion bar 1. The occurrence of the angle enables the relative angular displacement between the sensor body 8 and the magnetic ring 9 to change, so that an electric signal representing torque and rotation angle is generated, and finally steering control is realized. The first connecting structure a only changes the angle to a certain extent, when the torsion angle exceeds the range, the input shaft 2 and the connecting shaft 7 are integrally rotated together, the torsion bar 1 can not deform any more, and the structure is a torsion bar limiting protection structure, so that the torsion bar is not damaged due to limiting operation.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An electrically controlled hydraulic power steering gear, characterized in that it comprises a torsion bar (1);

One end of the torsion bar (1) is provided with an input shaft (2), and the outside of the input shaft (2) is connected with a steering wheel;

The other end of the torsion bar (1) is connected with a connecting shaft (7), and an intermediate shaft (10) is arranged on the connecting shaft (7);

The sensor body (8) of the electric control hydraulic power-assisted steering device is fixedly connected with the input shaft (2), and the magnetic ring (9) of the electric control hydraulic power-assisted steering device is fixedly connected with the connecting shaft (7);

The worm wheel (12) and the hydraulic input shaft (14) of the electric control hydraulic power steering are connected with the intermediate shaft (10).

2. An electrically controlled hydraulic power steering gear according to claim 1, characterized in that the torsion bar (1) is in an interference fit with the input shaft (2), the torsion bar (1) being in an interference fit with the connecting shaft (7).

3. An electrically controlled hydraulic power steering gear according to claim 2, characterized in that the torsion bar (1) is in interference fit with the input shaft (2) via a first connecting pin (3), and the torsion bar (1) is in interference fit with the connecting shaft (7) via a second connecting pin (18).

4. An electrically controlled hydraulic power steering gear according to claim 1, characterized in that the input shaft (2) is in a clearance fit with the connecting shaft (7).

5. An electrically controlled hydraulic power steering gear according to claim 1, characterized in that the connecting shaft (7) is in a clearance fit with the intermediate shaft (10).

6. An electrically controlled hydraulic power steering gear according to claim 1, characterized in that the inner wall of the input shaft (2) is provided with a first limit surface (201), the outer wall of the connecting shaft (7) is provided with a second limit surface (701), and that the first limit surface (201) rotates in the circumferential range of the second limit surface (701) when the electrically controlled hydraulic power steering gear is in operation.

7. An electrically controlled hydraulic power steering gear according to claim 6, characterized in that the inner wall of the input shaft (2) is further provided with a third limiting surface (202), the side wall of the connecting shaft (7) is further provided with a fourth limiting surface (702), and when the electrically controlled hydraulic power steering gear is in operation, the third limiting surface (202) rotates in the circumferential range of the fourth limiting surface (702).

8. The electrically controlled hydraulic power steering gear according to claim 7, wherein the first limiting surface (201) is arranged symmetrically to the third limiting surface (202), and the second limiting surface (701) is arranged symmetrically to the fourth limiting surface (702).

9. An electrically controlled hydraulic power steering gear according to claim 1, characterized in that a fifth limiting surface (703) is arranged on the outer side of the connecting shaft (7), a sixth limiting surface (101) is arranged on the inner wall of the intermediate shaft (10), and the fifth limiting surface (703) is matched with the sixth limiting surface (101).

10. An electrically controlled hydraulic power steering gear according to claim 1, characterized in that the sensor body (8) is welded to the input shaft (2) and the magnetic ring (9) is welded to the connecting shaft (7).