Steering-by-wire device

Abstract

The utility model relates to a steer-by-wire device which comprises a shell assembly, an angle sensor and a shell end cover, and a gear shaft and a rack shaft which are meshed with each other are installed in the shell assembly. The angle sensor is used for monitoring the steering angle of the gear shaft and comprises a rotor part and a stator part; the shell end cover is buckled on the shell assembly; the shell end cover is positioned at one axial end of the gear shaft; the rotor part is detachably installed on the gear shaft, the stator part is fixedly installed on the shell end cover, and the rotor part and the stator part are arranged in an opposite mode in the axial direction of the gear shaft. In the utility model, the rotor part and the stator part are separately arranged, the rotor part is detachably arranged on the gear shaft, and the stator part is fixedly arranged on the shell end cover. And during later maintenance and replacement, the rotor part can be quickly detached from the gear shaft, so that the gear shaft cannot be damaged, and the gear shaft is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of steering gears, and in particular relates to a wire-controlled steering device. Background Art

[0002] In the wire-controlled steering system, there is no mechanical connection between the steering wheel and the steering actuator. The method to achieve the steering function is that the main controller of the vehicle sends the steering angle target signal to the steering gear through the wire signal. The steering gear has its own angle sensor and controller to perform closed-loop control of the angle signal feedback. At present, most new domestic vehicles use electric power steering systems. Electric power steering systems can be divided into column-type electric power steering systems, gear-type electric power steering systems, and rack-type electric power steering systems according to the different positions of the power-assisting mechanism in the steering system.

[0003] For example, the Chinese utility model patent with the authorization announcement number CN215398893U provides a gear-type automotive wire-controlled electric power steering device, which is essentially a gear-type electric power steering, including a housing assembly, in which a rack shaft and a gear shaft that mesh with each other are installed. When in use, steering rods are installed at both ends of the rack shaft, and the gear shaft is driven to rotate by a worm gear mechanism. When in use, the power-assisted motor drives the gear shaft to rotate through the worm gear mechanism, and when the gear shaft rotates, it can drive the rack shaft to slide, thereby realizing power steering. Among them, the housing assembly includes the rack housing and worm gear housing in this patent.

[0004] In order to achieve closed-loop control, an angle sensor is usually used to monitor the steering angle of the gear shaft in real time, and the power motor performs angle closed-loop control based on the monitoring data, thereby achieving precise steering. The angle sensor includes a relatively arranged rotor part and a stator part. In the prior art, the rotor part and the stator part are usually welded to the gear shaft, as shown in the Chinese utility model patent with authorization announcement number CN219565224U.

[0005] The disadvantage of this method is that the rotor part and the stator part are both welded to the gear shaft, and destructive dismantling is required for later maintenance and replacement, which may cause damage to the gear shaft. Utility Model Content

[0006] The utility model provides a wire-controlled steering device to solve the technical problem in the prior art that the gear shaft is easily damaged when the angle sensor is disassembled.

[0007] In order to solve the above problems, the wire-controlled steering device provided by the present invention adopts the following technical solution: a wire-controlled steering device, comprising:

[0008] A housing assembly, wherein a gear shaft and a rack shaft meshing with each other are installed in the housing assembly;

[0009] An angle sensor, used to monitor the steering angle of the gear shaft, the angle sensor includes a rotor part and a stator part;

[0010] The steer-by-wire device also includes:

[0011] The housing end cover is buckled on the housing assembly, and the housing end cover is located at one axial end of the gear shaft;

[0012] The rotor part is detachably mounted on the gear shaft, and the stator part is fixedly mounted on the housing end cover. The rotor part and the stator part are arranged opposite to each other in the axial direction of the gear shaft.

[0013] The beneficial effect is that in the utility model, the rotor part and the stator part are arranged separately, the rotor part is detachably mounted on the gear shaft, and the stator part is fixedly mounted on the housing end cover. During later maintenance and replacement, the rotor part can be quickly removed from the gear shaft without causing damage to the gear shaft, thus protecting the gear shaft. Only the rotor part is mounted on the gear shaft, which also reduces the load on the gear shaft.

[0014] As a further optimization, a mounting blind hole is provided on one end face of the gear shaft close to the housing end cover, and the rotor part includes a protruding mounting shaft, which is fixed in the mounting blind hole. By providing the mounting blind hole on the end face of the gear shaft to mount the rotor part, the installation is more convenient.

[0015] As a further optimization, the mounting shaft and the mounting blind hole are interference fitted together.

[0016] As a further optimization, the stator part is detachably mounted on the housing end cover.

[0017] As a further optimization, a mounting column is provided on the inner side of the shell end cover facing the rotor part, the stator part includes a sensor circuit board, and the wire-controlled steering device includes a bolt, which passes through the sensor circuit board and is screwed into the mounting column to fix the sensor circuit board on the mounting column.

[0018] As a further optimization, the rotor part includes a multi-turn code disk, and the stator part includes a multi-turn induction coil corresponding to the multi-turn code disk one by one.

[0019] As a further optimization, the housing assembly includes a separately arranged rack and gear housing and a worm gear housing, the rack shaft and the gear shaft are both installed in the rack and gear housing, one end of the gear shaft is rotatably installed in the rack and gear housing, the other end of the gear shaft is located in the worm gear housing and a rotor part is provided at this end; a worm wheel and a worm are provided in the worm gear housing, the worm wheel is non-rotatably mounted on the gear shaft, and the worm is meshed with the worm wheel to drive the gear shaft to rotate; the housing end cover is buckled on one end of the worm gear housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0021] Figure 1 is an overall schematic diagram of a steer-by-wire device;

[0022] Figure 2 for Figure 1 Schematic diagram after removing the worm gear housing;

[0023] Figure 3 It is a schematic diagram of the structure of the gear shaft;

[0024] Figure 4 is a three-dimensional diagram of the rotor part;

[0025] Figure 5 It is a top view of the rotor part;

[0026] Figure 6 is a schematic diagram of the structure of the shell end cover;

[0027] Figure 7 It is a structural diagram of the stator part.

[0028] Description of reference numerals:

[0029] 1. Gear rack housing; 2. Worm gear housing; 3. Housing end cover; 4. Rack shaft; 5. Gear shaft; 6. Worm wheel; 7. Rotor part; 8. Stator part; 31. Mounting column; 51. Mounting blind hole; 71. Mounting shaft; 72. Code disk; 81. Sensor circuit board; 82. Induction coil; 83. Bolt through hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0031] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0032] Embodiment 1 of the wire-controlled steering device provided by the utility model:

[0033] like Figures 1 to 7 As shown, the wire control steering device includes a housing assembly, which is fixedly mounted on the vehicle body. The housing assembly includes a rack and pinion housing 1 and a worm gear housing 2, wherein the rack and pinion housing 1 and the worm gear housing 2 are detachably connected by bolts. A rack shaft 4 and a gear shaft 5 are installed in the rack and pinion housing 1, and both ends of the rack shaft 4 extend out of the rack and pinion housing 1. Both ends of the rack shaft 4 are used to connect the steering structure such as the tie rod, and the vehicle steering is controlled by sliding the rack shaft 4, and the gear shaft 5 and the rack shaft 4 are meshed with each other.

[0034] like Figure 1 and Figure 2 As shown, one end of the gear shaft 5 is installed in the gear rack housing 1, and the other end of the gear shaft 5 penetrates into the worm gear housing 2. A worm wheel 6 and a worm (not shown in the figure) are installed in the worm gear housing 2, and the worm wheel 6 is fixedly sleeved on the outside of the gear shaft 5. A motor (not shown in the figure) is installed on the worm gear housing 2, and the motor drives the rack shaft 4 to slide through the worm, worm wheel 6, and gear shaft 5 in sequence, thereby realizing steering.

[0035] A housing end cover 3 is also mounted on the worm gear housing 2 , wherein the housing end cover 3 is fixedly mounted on the worm gear housing 2 by three bolts and corresponds to one end of the gear shaft 5 .

[0036] Among them, the structures of the housing assembly, the rack shaft 4, the gear shaft 5, the worm wheel 6, and the worm are the same as those in the prior art and will not be repeated here.

[0037] The steer-by-wire device further comprises an angle sensor, which is located in the worm gear housing 2. The angle sensor monitors the steering angle of the gear shaft 5 in real time, thereby realizing closed-loop control.

[0038] The angle sensor includes a stator part 8 and a rotor part 7. The stator part 8 is fixedly mounted on the inner side of the housing end cover 3, and the rotor part 7 is fixedly mounted on the gear shaft 5, specifically, on one end of the gear shaft 5 close to the housing end cover 3. Specifically, a code disc 72 is arranged on the rotor part 7, and an induction coil 82 is provided on the sensor circuit board 81. The rotation angle of the rotor part 7 is detected by the stator part 8, so as to calculate the steering angle.

[0039] Specifically, a mounting blind hole 51 is provided at the end of the gear shaft 5, and a mounting shaft 71 protrudes from the center of the rotor part 7. The outer diameter of the mounting shaft 71 is consistent with the aperture of the mounting blind hole 51, and the mounting shaft 71 is inserted into the mounting blind hole 51 with interference fit, so that the rotor part 7 is fixedly mounted on the gear shaft 5, and the rotor part 7 can rotate synchronously with the gear shaft 5. When the rotor part 7 needs to be replaced or repaired, the mounting shaft 71 can be pulled out of the mounting blind hole 51 by applying force outward, thereby realizing the detachable assembly between the rotor part 7 and the gear shaft 5, and the gear shaft 5 will not be damaged during disassembly or assembly.

[0040] The stator part 8 is fixedly mounted on the inner side of the housing end cover 3 (i.e., the side facing the gear shaft 5), and the stator part 8 is detachably mounted on the housing end cover 3. Specifically, the stator part 8 includes a sensor circuit board 81, and three mounting columns 31 are integrally formed on the inner side of the housing end cover 3. The mounting columns 31 are provided with threaded holes, and the sensor circuit board 81 is provided with bolt through holes 83. Bolts are passed through the bolt through holes 83 and into the threaded holes, so as to fix the sensor circuit board 81 on the housing end cover 3.

[0041] In the present invention, the rotor part 7 is mounted on the gear shaft 5, and the stator part 8 is fixedly mounted on the housing end cover 3; at the same time, the rotor part 7 is detachably connected to the gear shaft 5 through the interference fit between the mounting shaft 71 in the rotor part 7 and the mounting blind hole 51, and the gear shaft 5 will not be damaged during disassembly and assembly. Moreover, the stator part 8 is also fixed to the housing end cover 3 by bolts, and detachable assembly is also achieved, which is convenient for installation and subsequent disassembly.

[0042] In this embodiment, the working principle of both the rotor part 7 and the stator part 8 is consistent with the prior art and will not be described in detail. In actual use, the angle sensor preferably uses a sensor that can only detect the steering angle, rather than a sensor that integrates multiple parameters such as torque and steering angle, so as to achieve a lightweight design and improve the convenience of installation.

[0043] Embodiment 2 of the wire-controlled steering device provided by the utility model:

[0044] The difference from Example 1 is that in Example 1, a mounting column is provided on the housing end cover, a bolt through hole is provided on the sensor circuit board, and the sensor circuit board is fixed to the housing end cover by bolts. In this embodiment, a card slot is provided on the inner side of the housing end cover, and the sensor circuit board is carded in the card slot, so that the housing end cover and the stator part can be detachably assembled.

[0045] In other embodiments, the stator portion may be welded or bonded to the housing end cover.

[0046] Embodiment 3 of the wire-controlled steering device provided by the utility model:

[0047] The difference from the embodiment 1 is that in the embodiment 1, the installation shaft is inserted into the installation blind hole and interference fit is performed. In this embodiment, the installation blind hole is a threaded hole, and the installation shaft is threadedly assembled in the threaded hole.

[0048] In other embodiments, in order to realize the detachable assembly of the rotor part and the gear shaft, the rotor part can be designed as a circular ring structure, and the rotor part can be interference fit on the gear shaft.

[0049] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A wire-controlled steering device, comprising: A housing assembly, wherein a gear shaft (5) and a rack shaft (4) meshing with each other are installed in the housing assembly; an angle sensor, used for monitoring the steering angle of the gear shaft (5), the angle sensor comprising a rotor part (7) and a stator part (8); It is characterized in that The steer-by-wire device also includes: The housing end cover (3) is buckled on the housing assembly, and the housing end cover (3) is located at one axial end of the gear shaft (5); The rotor part (7) is detachably mounted on the gear shaft (5), and the stator part (8) is fixedly mounted on the housing end cover (3). The rotor part (7) and the stator part (8) are arranged opposite to each other in the axial direction of the gear shaft (5).

2. The steer-by-wire device according to claim 1, characterized in that: A mounting blind hole (51) is provided on an end surface of the gear shaft (5) close to the housing end cover (3); the rotor part (7) comprises a protruding mounting shaft (71); and the mounting shaft (71) is inserted and fixed in the mounting blind hole (51).

3. The steer-by-wire device according to claim 2, characterized in that: The installation shaft (71) and the installation blind hole (51) are interference fitted together.

4. The steer-by-wire device according to claim 1, 2 or 3, characterized in that: The stator part (8) is detachably mounted on the housing end cover (3).

5. The steer-by-wire device according to claim 4, characterized in that: A mounting post (31) is provided on the inner side of the housing end cover (3) facing the rotor part (7), the stator part (8) includes a sensor circuit board (81), and the wire-controlled steering device includes a bolt, which passes through the sensor circuit board (81) and is screwed into the mounting post (31) to fix the sensor circuit board on the mounting post (31).

6. The steer-by-wire device according to claim 1, 2 or 3, characterized in that: The rotor part (7) includes a multi-turn code disk (72), and the stator part (8) includes a multi-turn induction coil (82) corresponding one-to-one to the multi-turn code disk (72).

7. The steer-by-wire device according to claim 1, 2 or 3, characterized in that: The housing assembly comprises a gear rack housing (1) and a worm gear housing (2) which are arranged separately, the rack shaft (4) and the gear shaft (5) are both installed in the gear rack housing (1), one end of the gear shaft (5) is rotatably installed in the gear rack housing (1), and the other end of the gear shaft (5) is located in the worm gear housing (2) and is provided with a rotor part (7); a worm wheel and a worm are provided in the worm gear housing (2), the worm wheel is fixedly sleeved on the gear shaft (5), and the worm is meshed with the worm wheel to drive the gear shaft (5) to rotate; and the housing end cover (3) is buckled on one end of the worm gear housing (2).

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