TWI395888B - Automotive linear actuators - Google Patents

Description

Linear actuator for vehicles

The present invention relates to a linear actuating device, and more particularly to a linear actuating device for a vehicle.

A conventional vehicle-assisted device, such as a power-assisted steering system applied to a steering machine, includes an electric motor, a speed reduction mechanism coupled to the electric motor, and a switching mechanism coupled to the speed reduction mechanism, the electric motor being used Providing auxiliary power, and having a rotating shaft, a plurality of magnets disposed on the rotating shaft, a stator unit surrounding the rotating shaft and the magnets and having a plurality of stator teeth, and a plurality of coils surrounding the stator teeth The speed reduction mechanism has a belt and a pulley to provide a function of power amplification. The conversion mechanism is used for providing a function of rotation and translation, and has a lead screw, a ball, a ball nut, and a steering rack. After the coils are sequentially energized, corresponding magnetic fields can be respectively generated. At this time, the stator units respectively have corresponding magnetic poles corresponding to the energizing directions of the coils, and the magnetic poles are respectively located The magnets of the rotating shaft respectively generate a repulsive or attracting effect, thereby driving the rotating shaft to rotate and being amplified by the speed reducing mechanism The output mechanism converts the rotating stroke into a moving stroke through the conversion mechanism, thereby interlocking the steering rack, thereby controlling the movement of the steering rack by applying different energizing directions to the coils. In turn, a linear auxiliary force is generated on the steering rack to achieve the purpose of assisting steering.

However, the vehicle actuation device has the disadvantages of a large number of components, a complicated structure, a high cost, a complicated assembly procedure, and difficulty in processing. Moreover, the stator teeth are prone to generate torque ripple after being electrically driven, and are easily caused by steering teeth. The phenomenon of uneven output.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a linear actuating device for a vehicle which can reduce cost, has a compact structure, can output an axial output force, and can make the power output smoother.

Thus, the linear actuating device for a vehicle of the present invention is applied to an automotive system including a shaft member, the linear actuator for the vehicle comprising a certain subunit, and a moving subunit.

The stator unit includes a non-metallic insulating sleeve member surrounding the one axis, a plurality of coils sleeved on the insulating sleeve member along the extending direction of the axis, and a receiving the insulating sleeve member and the coils a housing module, the moving unit includes a moving rod that is disposed on the insulating sleeve member and movable relative to the insulating sleeve member along the axis and connected to the shaft member, and is spaced apart along the extending direction of the axis a magnet that is placed on the moving rod.

The utility model has the advantages that the coil is directly surrounded by the periphery of the movable unit, and the movable rod is smoothly driven by the non-metallic arrangement of the insulating sleeve member, which is not only simple in structure, but also easy to install and more. The material can be reduced to reduce the cost, and the structural design of the stator without the stator can also make the moving rod able to receive a smooth axial output, and the force at the output is smoother.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Referring to Figures 1, 2, and 6, the preferred embodiment of the linear actuator for a vehicle of the present invention is applied to an automotive electric assist steering system 5 that includes a steering wheel 51 and a steering wheel 51. a steering column 52, an intermediate linkage rod 53 coupled to and rotating with the steering column 52, a pinion member (not shown) mounted to the intermediate linkage rod 53, and two rotations of the pinion member a shaft member 54 (referred to as a horizontal tie rod) moving along an axis L, a torsion sensor 55 connected to the intermediate linkage rod 53 , and an electrical connection between the torsion sensor 55 and the linear actuator for the vehicle An electronic control unit 56 (ECU) comprising a certain sub-unit 3 and a moving sub-unit 4.

Referring to Figures 2, 3 and 6, the stator unit 3 includes an insulating sleeve member 31 which is non-metallic and surrounds the axis L, and a plurality of coils which are sleeved on the insulating sleeve member 31 at intervals along the extending direction of the axis L. 32, and a housing module 33, the housing module 33 includes a housing portion 331 for receiving the insulating sleeve member 31 and the coils 32, and a housing portion 331 for electrically assisting the vehicle The mechanism fixing portion 332 of the steering system 5 is provided with a pinion mounting hole 333 for receiving the pinion member. In the embodiment, the insulating sleeve member 31 is made of nylon.

Referring to Figures 2, 3 and 4, the insulating sleeve member 31 has a ring wall 311 surrounding the axis L, two outer bushings 312 disposed at opposite ends of the ring wall 311 along the direction of the axis L, and a plurality of edges. The extending direction of the axis L is spaced apart from the outer surface of the ring wall 311 to accommodate the receiving ring groove 314 of the coils 32. The distance between the receiving ring grooves 314 determines the change of the magnetic field of the coil. Trends, thus planning the required spacing as needed.

Each of the coils 32 has a first end 321 and a second end 322 respectively inputting a power supply force. In the present embodiment, the coils 32 are powered by the driving of the electronic control unit 56.

Referring to Figures 2, 3 and 5, the mover unit 4 includes a shaft member that is threaded through the insulating sleeve member 31 and movable relative to the insulating sleeve member 31 along the axis L and that is coupled to the automotive electric assist steering system 5. The moving rod 41 of the 54 is disposed on the magnet 42 of the moving rod 41 at intervals along the extending direction of the axis L, and the moving rod 41 and the outer bushing 312 are disposed along the extending direction of the axis L. Inner shaft sleeve 43. In this embodiment, a portion of the magnets 42 are covered by the inner shaft sleeves 43 and supported by the inner shaft sleeves 43 to cause the magnets 42 to be coupled between the magnets 42 and the coils 32. Corresponding air gap. It is to be noted that the magnetic poles of one side of the magnet 42 adjacent to the insulating sleeve member 31 may be arranged in such a manner that the N pole and the S pole are arranged in a phase-arranged manner, and each magnet 42 is integrally formed in a ring shape. In addition to the form, a plurality of small magnets may be combined into a ring shape and sleeved on the moving rod 41.

Referring to Figures 3, 5 and 6, the moving rod 41 has an electromagnetic transmission portion 411 for the magnets 42, a mechanism opposite to the electromagnetic transmission portion 411 for connecting the pinion members of the automotive electric assist steering system 5. The fixing portion 412 is disposed at an outer surface of the electromagnetic transmission portion 411 at intervals along the extending direction of the axis L to accommodate the magnet mounting groove 413 of the magnet 42, and a plurality of the fixing portions 412 are disposed at the mechanism fixing portion 412 to electrically engage the automobile The helical teeth 414 of the pinion member of the steering system 5 are assisted. In the embodiment, the moving rod 41 and the shaft member 54 are integrally formed, but the two separate components may be assembled with each other.

Referring to FIGS. 2, 3, and 6, after the steering wheel 51 is rotated and the torque sensor 55 senses the torque, the electronic control unit 56 inputs a positive voltage or a negative voltage from the first end 321 of each coil 32, respectively. After the second negative terminal 322 inputs a different negative voltage or positive voltage, a magnetic field can be generated at the corresponding coil 32, and the magnetic field can attract or repel the adjacent magnet 42 and then interlock. The moving rod 41 moves, and after the arrangement of the magnetic poles of the magnets 42 and the corresponding energizing manners of the coils 32, the axial force generated by the magnetic force can be controlled to control the moving rod 41. After moving and cooperating with the automobile electric assist steering system 5, it is possible to achieve an effect of electrically generating an assisting force to steer the vehicle.

Referring to FIG. 7, a schematic view of the preferred embodiment applied to an automobile brake assembly 6 includes a piston housing 61 housed in the piston housing 61 and along the axis L. a first piston 62, a first spring 63, a second piston 64 and a second spring 65 are disposed in the piston housing 61 and are respectively disposed corresponding to the first spring 66 and the second spring 67. a first oil outlet 66 and a second oil outlet 67, a brake oil cup 68 connecting the piston housing 61, a shaft member 69 connecting the first piston 62 and the moving rod 41, and a connection The brake pedal mechanism 70 of the shaft member 69. In this embodiment, the moving member 41 and the shaft member 69 are integrally formed, but the two separated components may be assembled with each other.

When the brake pedal mechanism 70 is stepped on, the movement lever 41 is driven to move along the axis L through a control module (not shown), and the shaft member 69 is moved, the first piston 62 is moved, and then the first piston 62 is compressed. A spring 63 pushes the second piston 64 to move, and finally compresses the second spring 65. At this time, the squeezed oil is input into the braking mechanism from the first oil outlet 66 and the second oil outlet 67 (Fig. The brakes are generated, and the linear motion device of the vehicle can also achieve the effect of assisting the brakes.

It is worth mentioning that the present invention can also be applied to a vehicle suspension structure of a vehicle or other mechanism requiring an axial output, and the same function can be achieved by connecting the movable shaft 41 to the appropriate shaft member 54.

In summary, the coils 32 can be smoothly driven by directly surrounding the periphery of the movable unit 4, through the arrangement of the non-metallic insulating sleeve member 31, and appropriately arranging the positions of the coils 32. The moving rod 41 moves to generate an axial output force, and the movement of the shaft members 54 and 69 is linked. Compared with the existing linear actuator for a vehicle, the structure is simple, the installation is easy, and the material is reduced to reduce the cost. The structural design of the statorless member can enable the moving rod 41 to be subjected to a smooth axial output, and the output is smoother, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

3. . . Stator unit

31. . . Insulating sleeve

311. . . Ring wall

312. . . Outer bushing

314. . . Locating ring groove

315. . . Spacer groove

32. . . Coil

321. . . First end

322. . . Second end

33. . . Shell module

331. . . Housing

332. . . Institutional fixed department

333. . . Pinion mounting hole

4. . . Moving unit

41. . . Moving rod

411. . . Electromagnetic transmission

412. . . Institutional fixed department

413. . . Magnet mounting slot

414. . . Grooving

42. . . magnet

43. . . Inner shaft sleeve

5. . . Automotive electric assist steering system

51. . . steering wheel

52. . . Steering column

53. . . Intermediate linkage

54. . . Shaft

55. . . Torque sensor

56. . . Electronic control unit

6. . . Car brake assembly

61. . . Piston housing

62. . . First piston

63. . . First spring

64. . . Second piston

65. . . Second spring

66. . . First oil outlet

67. . . Second oil outlet

68. . . Brake oil cup

69. . . Shaft

70. . . Brake pedal mechanism

L. . . Axis

1 is a perspective assembled view of a preferred embodiment of the linear actuating device for a vehicle of the present invention;

Figure 2 is an exploded perspective view of the preferred embodiment;

Figure 3 is a cross-sectional view of the preferred embodiment;

Figure 4 is a front elevational view of an insulating sleeve member of the preferred embodiment;

Figure 5 is a top plan view of a moving rod of the preferred embodiment;

Figure 6 is a schematic view showing the use of the preferred embodiment in an automotive electric assist steering system; and

Fig. 7 is a schematic view showing the use of the preferred embodiment in an automobile brake assembly.

3. . . Stator unit

31. . . Insulating sleeve

312. . . Outer bushing

32. . . Coil

321. . . First end

322. . . Second end

33. . . Shell module

331. . . Housing

332. . . Institutional fixed department

333. . . Pinion mounting hole

4. . . Moving unit

41. . . Moving rod

42. . . magnet

43. . . Inner shaft sleeve

Claims (7)

A linear actuating device for a vehicle is applied to an automobile system including a shaft member, the linear actuating device for the vehicle comprising: a certain subunit, comprising an insulating sleeve member made of non-metal and surrounding an axis, and a plurality of along the axis And a housing module for accommodating the insulating sleeve member, and a housing module for accommodating the insulating sleeve member and the coils; and a moving subunit including a driving sleeve member and a moving rod that moves along the axis relative to the insulating sleeve member and connects the shaft member, a plurality of magnets that are sleeved on the moving rod at intervals along an extending direction of the axis, and at least one direction along which the axis extends The inner shaft sleeve of the rod. The linear actuator for a vehicle according to claim 1, wherein the insulating sleeve member has a ring wall surrounding the axis, and a plurality of outer surfaces of the ring wall are spaced apart from each other along the extending direction of the axis. The accommodating ring grooves of the coils are accommodated. The vehicular linear actuating device of claim 2, wherein the insulating sleeve member further has two outer bushings disposed at opposite ends of the ring wall along an extending direction of the axis, the inner bushing Located inside the outer bushings to connect the corresponding magnets. The vehicular linear actuating device according to claim 1, wherein the moving rod has an electromagnetic transmission portion for the magnets, and a plurality of electromagnetic transmission portions are disposed at intervals along an extending direction of the axis. The outer surface is a magnet mounting groove for receiving the magnets. The linear actuator for a vehicle according to the first aspect of the invention, wherein each of the magnets is formed by a plurality of small magnets combined in a ring shape and sleeved on the moving rod. The linear actuator for a vehicle according to the fourth aspect of the invention, wherein each of the magnets is formed by a plurality of small magnets combined in a ring shape and sleeved on the moving rod. The vehicular linear actuating device according to claim 4, wherein the moving rod further has a mechanism fixing portion opposite to the electromagnetic transmission portion, and a plurality of helical teeth located at the fixing portion of the mechanism.