Electrically-controlled hydraulic power-assisted steering gear

Abstract

The exterior 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 the three-section structure is good in assembly manufacturability and high in reliability. The electronic control hydraulic power-assisted steering gear is simple in structure, convenient and simple to assemble, disassemble and replace and easy to operate, and in addition, the sensor body of the electronic control hydraulic power-assisted steering gear is fixedly connected with the input shaft; a magnetic ring of the electric control hydraulic power-assisted steering gear is fixedly connected with the connecting shaft, namely, a sensor body of the torque angle sensor and the magnetic ring are arranged in an exchange mode, a worm gear of the electric control hydraulic power-assisted steering gear and a hydraulic input shaft are both connected with the middle shaft, and finally the steering function is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steering gears and relates to an electronically controlled hydraulic power steering gear. Background Art

[0002] The steering system controls the lateral movement of the vehicle, affecting the handling stability, active safety and driving comfort of the vehicle. The electric hydraulic power steering system (EHPS) is a traditional hydraulic power steering system (HPS) with a wire control part (motor, electronic control, and speed reduction mechanism) added. It is mainly used in medium and heavy commercial vehicles.

[0003] Compared with the traditional HPS, EHPS has the advantages of faster steering response, lighter steering, variable power with speed, active self-centering, performance and fault detection, and can also realize auxiliary driving functions such as lane keeping and automatic parking. It is the future development direction of the steering system of medium and heavy-duty commercial vehicles and an important part of the wire-controlled chassis. However, the wire-controlled part of the EHPS system currently has poor assembly processability and is difficult to assemble and replace. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides an electronically controlled hydraulic power steering device, thereby solving the technical problems of poor assembly processability and difficulty in assembly and disassembly of the wire control part of the EHPS system in the prior art.

[0005] The utility model is realized by the following technical solutions:

[0006] An electronically controlled hydraulic power steering device includes a torsion bar;

[0007] An input shaft is provided at one end of the torsion bar, and the outside of the input shaft is connected to the steering wheel;

[0008] The other end of the torsion bar is connected to a connecting shaft, and an intermediate shaft is provided on the connecting shaft;

[0009] The sensor body of the electronically controlled hydraulic power steering device is fixedly connected to the input shaft; the magnetic ring of the electronically controlled hydraulic power steering device is fixedly connected to the connecting shaft;

[0010] The worm gear and the hydraulic input shaft of the electronically controlled hydraulic power steering device are both connected to the intermediate shaft.

[0011] Preferably, the torsion bar is in interference fit with the input shaft, and the torsion bar is in interference fit with the connecting shaft.

[0012] Preferably, the torsion bar and the input shaft are interference fit through a first connecting pin; the torsion bar and the connecting shaft are interference fit through a second connecting pin.

[0013] Preferably, the input shaft and the connecting shaft are clearance-fitted.

[0014] Preferably, the connecting shaft and the intermediate shaft are clearance-fitted.

[0015] Preferably, the inner wall of the input shaft is provided with a first limit surface, and the outer wall of the connecting shaft is provided with a second limit surface. When the electronically controlled hydraulic power steering device is in operation, the first limit surface rotates within the circumferential range of the second limit surface.

[0016] Preferably, the inner wall of the input shaft is further provided with a third limit surface, and the side wall of the connecting shaft is further provided with a fourth limit surface. When the electronically controlled hydraulic power steering device is in operation, the third limit surface rotates within the circumferential range of the fourth limit surface.

[0017] Preferably, the first limiting surface is symmetrically arranged with the third limiting surface, and the second limiting surface is symmetrically arranged with the fourth limiting surface.

[0018] Preferably, a fifth limiting surface is provided on the outer side of the connecting shaft, a sixth limiting surface is provided on the inner wall of the intermediate shaft, and the fifth limiting surface and the sixth limiting surface are arranged in coordination with each other.

[0019] Preferably, the sensor body is fixed to the input shaft by welding, and the magnetic ring is fixed to the connecting shaft by welding.

[0020] Compared with the prior art, the utility model has the following beneficial technical effects:

[0021] The utility model discloses an electronically controlled hydraulic power steering device, wherein the outside of an input shaft is connected to a steering wheel, the input shaft is connected to one end of a torsion bar, the other end of the torsion bar is connected to a connecting shaft, an intermediate shaft is also provided on the connecting shaft, the input shaft, the connecting shaft and the intermediate shaft form a three-section structure, the three-section structure has good assembly processability, and is convenient and simple to assemble and disassemble, and easy to operate. In addition, a sensor body of the electronically controlled hydraulic power steering device is fixedly connected to the input shaft; a magnetic ring of the electronically controlled hydraulic power steering device is fixedly connected to the connecting shaft, that is, a sensor body and a magnetic ring of a torque angle sensor are arranged in an interchangeable manner, so that the assembly and disassembly of the power steering device are more convenient. The worm gear and the hydraulic input shaft of the electronically controlled hydraulic power steering device are both connected to the intermediate shaft, and finally a steering function is realized.

[0022] Furthermore, the torsion bar and the input shaft have an interference fit, and the torsion bar and the connecting shaft have an interference fit, so that the rotation of the steering wheel can be transmitted to the input shaft better and more completely.

[0023] Furthermore, the input shaft and the connecting shaft are clearance-matched so that they can rotate relative to each other.

[0024] Furthermore, the connecting shaft and the intermediate shaft are clearance-matched, so that the rotational force between the two is more easily transmitted.

[0025] Furthermore, the inner wall of the input shaft is provided with a first limit surface, and the outer wall of the connecting shaft is provided with a second limit surface. When the electronically controlled hydraulic power steering device is in operation, the first limit surface rotates within the circumferential range of the second limit surface. The setting of the first limit surface and the second limit surface effectively constitutes a torsion bar limit protection structure, so that the torsion bar will not be damaged due to extreme operation.

[0026] Furthermore, the inner wall of the input shaft is provided with a third limit surface, and the side wall of the connecting shaft is provided with a fourth limit surface. When the electronically controlled hydraulic power steering gear is in operation, the third limit surface rotates within the circumferential range of the fourth limit surface, thereby further improving the protection of the torsion bar.

[0027] Furthermore, the first limiting surface is symmetrically arranged with the third limiting surface, and the second limiting surface is symmetrically arranged with the fourth limiting surface, which can improve the stability of the device.

[0028] Furthermore, a fifth limiting surface is provided on the outer side of the connecting shaft, and a sixth limiting surface is provided on the inner wall of the intermediate shaft. The fifth limiting surface and the sixth limiting surface are arranged in coordination with each other so that the connecting shaft and the intermediate shaft cannot rotate relative to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of the structure of an electronically controlled hydraulic power steering device in the utility model;

[0031] Figure 2 This is a schematic diagram of the connection structure between the input shaft and the connecting shaft in the utility model;

[0032] Figure 3 It is a schematic diagram of the connection structure between the connecting shaft and the intermediate shaft in the utility model.

[0033] Wherein: 1. torsion bar, 2. input shaft, 3. first connecting pin, 4. first O-ring, 5. dust cover, 6. upper cover, 7. connecting shaft, 8. sensor body, 9. magnetic ring, 10. intermediate shaft, 11. worm gear partition, 12. worm gear, 13. first oil seal, 14. hydraulic input shaft, 15. wire control housing, 16. connecting bolt, 17. connecting ring, 18. second connecting pin, 19. second O-ring, 20. third O-ring, 21. first deep groove ball bearing, 22. needle roller bearing, 23. second deep groove ball bearing, 24. bushing, 25. second oil seal, A. first welding position, B. second welding position, a. first connecting structure, b. second connecting structure, 201. first limiting surface, 701. second limiting surface, 202. third limiting surface, 702. fourth limiting surface, 703. fifth limiting surface, 101. sixth limiting surface. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] The utility model is further described in detail below with reference to the accompanying drawings:

[0041] like Figure 1 As shown, the utility model discloses an electronically controlled hydraulic power steering device, comprising a torsion bar 1; an input shaft 2 is provided at one end of the torsion bar 1, and the outside of the input shaft 2 is connected to the steering wheel; the other end of the torsion bar 1 is connected to a connecting shaft 7, and an intermediate shaft 10 is provided on the connecting shaft 7; a sensor body 8 of the electronically controlled hydraulic power steering device is fixedly connected to the input shaft 2; a magnetic ring 9 of the electronically controlled hydraulic power steering device is fixedly connected to the connecting shaft 7; a worm gear 12 of the electronically controlled hydraulic power steering device and a hydraulic input shaft 14 are both connected to the intermediate shaft 10.

[0042] In a preferred embodiment, the sensor body 8 is fixed to the input shaft 2 by welding, and the magnetic ring 9 is fixed to the connecting shaft 7 by welding.

[0043] In another feasible embodiment of the utility model, the torsion bar 1 is interference-fitted with the input shaft 2, and the torsion bar 1 is interference-fitted with the connecting shaft 7, so that the rotational force of the steering wheel can be better and more fully transmitted. Specifically, the torsion bar 1 is interference-fitted with the input shaft 2 through the first connecting pin 3; the torsion bar 1 is interference-fitted with the connecting shaft 7 through the second connecting pin 18.

[0044] At the same time, in a more preferred embodiment of the present invention, the input shaft 2 and the connecting shaft 7 are clearance-matched, and the clearance-matching here mainly emphasizes that in addition to Figure 2 The matching mode of the area a, i.e. the arc part on the input shaft 2 and the connecting shaft 7, the clearance matching of this area allows the input shaft 2 and the connecting shaft 7 to rotate relative to each other by a certain angle. In addition, the connecting shaft 7 and the intermediate shaft 10 have a clearance matching. Similarly, the clearance matching here refers to the Figure 3The other contact positions outside the middle b area, namely the arc portion of the connecting shaft 7 and the intermediate shaft 10, have clearance fit, which makes it easier to transmit the rotational force between the two.

[0045] In another preferred embodiment, Figure 2 As shown, the inner wall of the input shaft 2 is provided with a first limiting surface 201, and the outer wall of the connecting shaft 7 is provided with a second limiting surface 701. When the electronically controlled hydraulic power steering device is in operation, the first limiting surface 201 rotates within the circumferential range of the second limiting surface 701. More preferably, the side of the input shaft 2 is further provided with a third limiting surface 202, and the inner wall of the connecting shaft 7 is further provided with a fourth limiting surface 702. When the electronically controlled hydraulic power steering device is in operation, the third limiting surface 202 rotates within the circumferential range of the fourth limiting surface 702. The first limiting surface 201 is symmetrically arranged with the third limiting surface 202, and the second limiting surface 701 is symmetrically arranged with the fourth limiting surface 702. In the specific structure, the first limiting surface 201 and the third limiting surface 202 are composed of several side walls with different curvatures. The curvatures of the first limiting surface 201 and the third limiting surface 202 are different from the main curvature of the inner wall of the input shaft 2, so that the input shaft 2 can only rotate within the curvature limited by the first limiting surface 201 and the third limiting surface 202, which effectively protects the torsion bar.

[0046] In another preferred embodiment, Figure 3 As shown, a fifth limiting surface 703 is provided on the outer side of the connecting shaft 7, and a sixth limiting surface 101 is provided on the inner wall of the intermediate shaft 10. The fifth limiting surface 703 and the sixth limiting surface 101 are arranged in coordination with each other. Here, the fifth limiting surface 703 and the sixth limiting surface 101 are both planes. The two planes are arranged in coordination so that the connecting shaft 7 and the intermediate shaft 10 cannot rotate relative to each other.

[0047] The utility model discloses an electronically controlled hydraulic power steering device, wherein the outside of the input shaft is connected to the steering wheel, the input shaft is connected to one end of the torsion bar, the other end of the torsion bar is connected to the connecting shaft, and an intermediate shaft is also provided on the connecting shaft. The input shaft, the connecting shaft and the intermediate shaft constitute a three-stage structure, while in the traditional process, it is a two-stage structure. The three-stage structure in the utility model has good assembly processability, and is convenient and simple to assemble and disassemble, and is easy to operate. In addition, the sensor body 8 of the electronically controlled hydraulic power steering device is fixedly connected to the input shaft 2; the magnetic ring 9 of the electronically controlled hydraulic power steering device is fixedly connected to the connecting shaft 7, that is, the sensor body and the magnetic ring of the torque angle sensor are swapped, while the traditional process is that the magnetic ring is welded to the input shaft, and the sensor body is welded to the connecting shaft. This swap design makes assembly and disassembly more convenient. The worm gear 12 and the hydraulic input shaft 14 of the electronically controlled hydraulic power steering device are both connected to the intermediate shaft 10, so as to realize the final steering function. Another improvement of the utility model is that a torsion bar limit protection structure is designed, which effectively ensures the safety and stability of the device, and does not cause damage due to extreme operation.

[0048] Specifically, the assembly relationship of the utility model is as follows: one end of the torsion bar 1 and the input shaft 2 are interference-fitted through the first connecting pin 3, the other end of the torsion bar 1 and the connecting shaft 7 are interference-fitted through the second connecting pin 18, the first O-ring 4 is sleeved on the upper part of the torsion bar 1, the inner hole of the dust cover 5 and the input shaft 2 are clearance-fitted, the outer ring of the dust cover 5 and the upper cover 6 are clearance-fitted, the connecting shaft 7 and the input shaft 2 are clearance-fitted and are clearance-fitted through the first connecting structure a (such as Figure 2 As shown in the figure, the two can rotate relative to each other by a certain angle, the sensor body 8 and the input shaft 2 are connected as a whole by welding at the first welding position A, the magnetic ring 9 and the intermediate shaft 10 are connected as a whole by welding at the second welding position B, the outer ring of the worm wheel partition 11 and the wire control housing 15 are clearance-fitted, the inner hole of the worm wheel partition 11 and the first deep groove ball bearing 21 are interference-fitted, the inner hole of the worm wheel 12 and the intermediate shaft 10 are interference-fitted, the hydraulic input shaft 14 and the intermediate shaft 10 are connected by splines, the connecting bolt 16 and the connecting shaft 7 are threadedly connected and locked by the connecting ring 17, the connecting shaft 7 and the intermediate shaft 10 are clearance-fitted and connected by the second connecting structure b (as shown in the figure, the sensor body 8 and the input shaft 2 are connected as a whole by welding at the first welding position A, the magnetic ring 9 ... wire control housing 15, the inner hole of the worm wheel partition 11 and the first deep groove ball bearing 21 are interference-fitted, the inner hole of the worm wheel 12 and the intermediate shaft 10 are interference-fitted, the hydraulic input shaft 14 and the intermediate shaft 10 are spline-connected, the connecting bolt 16 and the connecting shaft 7 are threadedly connected and locked by the connecting ring 17, the connecting shaft 7 and the intermediate shaft 10 are clearance-fitted and connected by the second connecting structure b (as shown in the figure, the sensor body 8 and the input shaft 2 are connected as a whole by welding at the first welding position A, the magnetic ring 9 and the intermediate shaft 10 are clearance-fitted Figure 3 The second deep groove ball bearing 23 and the intermediate shaft 10 are connected as shown in the figure so that they cannot rotate relative to each other, the inner hole of the second deep groove ball bearing 23 and the intermediate shaft 10 are interference fit, the outer ring of the needle roller bearing 22 and the upper cover 6 are interference fit, the inner ring needle of the needle roller bearing 22 and the connecting shaft 7 are sliding fit, the outer ring of the second deep groove ball bearing 23 and the upper cover 6 are interference fit, the inner ring of the second deep groove ball bearing 23 and the sleeve 24 are interference fit, and the sleeve 24 and the input shaft 2 are interference fit.

[0049] The conventional design has only two sections of the input shaft 2 and the connecting shaft 7, and the magnetic ring 9 is welded to the input shaft 2, and the sensor body 8 is welded to the connecting shaft 7. This design has poor assembly processability and is difficult to assemble and disassemble.

[0050] The design scheme is to add an intermediate shaft 10, which together with the input shaft 2, the connecting shaft 7 and other structures forms a three-section structure, and weld the sensor body 8 to the input shaft 2, and weld the magnetic ring 9 to the connecting shaft 7, that is, the sensor body 8 and the magnetic ring 9 of the torque angle sensor are swapped.

[0051] Brief description of working principle:

[0052] One end of the torsion bar 1 is interference fit with the input shaft 2 through the first connecting pin 3, and the other end of the torsion bar 1 is interference fit with the connecting shaft 7 through the second connecting pin 18. The upper end of the input shaft 2 is externally connected to the steering wheel through a steering control mechanism. When the steering wheel is turned by hand, the input shaft 2 drives the torsion bar 1 to rotate synchronously, and the torsion bar 1 is deformed relative to the connecting shaft 7, that is, the angular displacement between the input shaft 2 and the connecting shaft 7 changes. The sensor body 8 of the torque angle sensor is welded to the input shaft 2 as a whole, and the magnetic ring 9 is welded to the connecting shaft 7 as a whole. Therefore, the sensor body 8 and the magnetic ring 9 have an angular displacement change, which is converted into an electrical signal related to the torque angle sensor. The electrical signal is reflected in the torque and angle of the steering wheel. The torque angle sensor sends the electrical signal to the controller ECU in real time. The controller ECU controls the motor to rotate according to the received electrical signal and control logic. The motor drives the worm wheel 12 to rotate after the worm gear speed reduction and distance increase. The worm wheel 12 drives the intermediate shaft 10 and the hydraulic input shaft 14 to rotate together. The hydraulic input shaft 14 controls the hydraulic part to work and finally realizes the steering function. The three-stage structure of the present invention has good assembly processability, and is convenient and simple to assemble and disassemble, and easy to operate.

[0053] like Figure 2 As shown, the input shaft 2 and the connecting shaft 7 are clearance-matched and can rotate relative to each other by a certain angle through the first connecting structure a. This angle is the angular range of the deformation of the torsion bar 1. The appearance of this angle causes the relative angular displacement between the sensor body 8 and the magnetic ring 9 to change, thereby generating an electrical signal reflecting the torque and the angle, and finally realizing the steering control. The first connecting structure a allows the angle to change only within a certain range. When the torsion angle exceeds the range, the input shaft 2 and the connecting shaft 7 rotate together as a whole. At this time, the torsion bar 1 will no longer deform. This structure is the torsion bar limit protection structure, which prevents the torsion bar from being damaged due to extreme operation.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronically controlled hydraulic power steering device, characterized in that: comprising a torsion bar (1); An input shaft (2) is provided at one end of the torsion bar (1), and the outside of the input shaft (2) is connected to the steering wheel; The other end of the torsion bar (1) is connected to a connecting shaft (7), and an intermediate shaft (10) is provided on the connecting shaft (7); The sensor body (8) of the electronically controlled hydraulic power steering device is fixedly connected to the input shaft (2); the magnetic ring (9) of the electronically controlled hydraulic power steering device is fixedly connected to the connecting shaft (7); The worm gear (12) and the hydraulic input shaft (14) of the electronically controlled hydraulic power steering device are both connected to the intermediate shaft (10).

2. The electronically controlled hydraulic power steering device according to claim 1, characterized in that: The torsion bar (1) and the input shaft (2) are in interference fit, and the torsion bar (1) and the connecting shaft (7) are in interference fit.

3. The electronically controlled hydraulic power steering device according to claim 2, characterized in that: The torsion bar (1) and the input shaft (2) are interference-fitted via a first connecting pin (3); the torsion bar (1) and the connecting shaft (7) are interference-fitted via a second connecting pin (18).

4. The electronically controlled hydraulic power steering device according to claim 1, characterized in that: The input shaft (2) and the connecting shaft (7) are clearance-matched.

5. The electronically controlled hydraulic power steering device according to claim 1, characterized in that: The connecting shaft (7) and the intermediate shaft (10) are clearance-matched.

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

7. The electronically controlled hydraulic power steering device according to claim 6, characterized in that: The inner wall of the input shaft (2) is also provided with a third limit surface (202), and the side wall of the connecting shaft (7) is also provided with a fourth limit surface (702). When the electronically controlled hydraulic power steering device is in operation, the third limit surface (202) rotates within the circumferential range of the fourth limit surface (702).

8. The electronically controlled hydraulic power steering device according to claim 7, characterized in that: 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.

9. The electronically controlled hydraulic power steering device according to claim 1, characterized in that: A fifth limiting surface (703) is provided on the outer side of the connecting shaft (7), a sixth limiting surface (101) is provided on the inner wall of the intermediate shaft (10), and the fifth limiting surface (703) and the sixth limiting surface (101) are arranged in coordination.

10. The electronically controlled hydraulic power steering device according to claim 1, characterized in that: The sensor body (8) is fixed to the input shaft (2) by welding, and the magnetic ring (9) is fixed to the connecting shaft (7) by welding.

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