KR101024265B1 - Actuator for electric parking brake system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for an electronic parking brake apparatus, and more particularly, to an actuator for an electronic parking brake apparatus capable of improving assembly performance and miniaturizing a product.

The present invention is seated in the power transmission unit for transmitting the rotational force of the motor and the motor to the output shaft, the motor and the power transmission unit is seated on a different surface, and the second case coupled to the first case to restrain the power transmission unit and It provides an actuator for an electronic parking brake device including a motor case coupled to the first case to restrain the motor.

Drive, Power Train, Output Shaft, Deceleration, Actuator

Description

Actuator for Electronic Parking Brake System {ACTUATOR FOR ELECTRIC PARKING BRAKE SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for an electronic parking brake apparatus, and more particularly, to an actuator for an electronic parking brake apparatus capable of improving assembly performance and miniaturizing a product.

In general, the actuator is an actuator for moving a rotatably installed member or a slidably installed member, such as a door installed inside a duct of an air conditioner, and a friction member of a parking brake device that restrains a wheel of a vehicle. Is installed for driving a member that is difficult to drive directly.

In particular, the actuator installed in the electronic parking brake device must maintain a state in which the friction member restrains the rotation of the wheel, so that the driving force must be transmitted to the output shaft of the actuator even after the brake device is operated.

In addition, since the vehicle must be prevented from being moved by the slip of the friction member after the operation of the brake device is started, the driving force transmitted from the actuator to the friction member requires a high output driving force of a predetermined value or more.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

The actuator for the electronic parking brake apparatus according to the prior art has a problem in that the output shaft is spaced when driven for a long time because a high output is applied to the output shaft, and the structure of the actuator is provided because the support member is installed to suppress the output shaft from being spaced apart. It is complicated and there is a problem that assembly is not easy.

Therefore, there is a need for improvement.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an actuator for an electronic parking brake apparatus which can be miniaturized due to its simple structure and improved in assembly.

In order to achieve the above object, the present invention is a motor and a power transmission unit for transmitting the rotational force of the motor to the output shaft is seated, the motor and the power transmission unit is seated on a different surface and the first case, and the first And a second case coupled to the case and restraining the power transmission unit, and a motor case coupled to the first case and restraining the motor.

In addition, a motor insertion part into which the motor is inserted is formed on an outer wall of the first case of the present invention, and a rotation groove part is rotatably inserted into the power transmission part on an inner wall of the first case opposite to the motor insertion part. It provides an actuator for an electronic parking brake device, characterized in that.

In addition, the outer wall of the motor insertion portion of the present invention is provided with an directional projection, the motor facing the directional projection provides an actuator for an electronic parking brake device, characterized in that the directional groove is formed.

In addition, the rotary shaft of the motor of the present invention, the restraining projection is formed, the pinion to which the rotation shaft is coupled is inserted into the restraining projection for the electronic parking brake device characterized in that the restraint groove is formed to restrain the rotation of the pinion. Provide the actuator.

In addition, the second case facing the pinion of the present invention, the support portion for rotatably supporting the pinion is formed, the support portion is an actuator for an electronic parking brake device, characterized in that the ball contacting the pinion is inserted. To provide.

The actuator for the electronic parking brake apparatus according to the present invention has a motor case made of a separate material, and the motor and the power transmission unit are coupled to the other side of the case, respectively, so that the assembly of the motor is not considered when designing the mounting position of the power transmission unit. Is improved and the product can be miniaturized.

In addition, the actuator for the electronic parking brake apparatus according to the present invention is engaged with the rotation shaft and the pinion of the motor, the pinion is rotatably supported by the support portion, so that the motor and pinion can be easily assembled, and the motor insertion portion Since the direction projections are formed, there is an advantage that the assembly of the motor and the case can be easily performed.

Hereinafter, an embodiment of an actuator for an electronic parking brake apparatus according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a perspective view showing an actuator for an electronic parking brake apparatus according to an embodiment of the present invention, Figure 2 is a perspective view showing an output hole and a motor case of the actuator for an electronic parking brake apparatus according to an embodiment of the present invention 3 is an exploded perspective view showing an actuator for an electronic parking brake apparatus according to an embodiment of the present invention.

4 is an exploded perspective view illustrating a power transmission unit of the actuator for an electronic parking brake apparatus according to an embodiment of the present invention, and FIG. 5 is a power transmission of the actuator for an electronic parking brake apparatus according to an embodiment of the present invention. 6 is a cross-sectional view showing an actuator for an electronic parking brake apparatus according to an embodiment of the present invention.

7 is a perspective view illustrating a third reduction gear and an output shaft of an actuator for an electronic parking brake apparatus according to an embodiment of the present invention, and FIG. 8 is an actuator for an electronic parking brake apparatus according to an embodiment of the present invention. An exploded perspective view showing an output shaft mounting structure.

1 to 8, an actuator for an electronic parking brake apparatus according to an embodiment of the present invention includes a case 50, a motor 70 installed in the case 50 and generating rotational force, and a case 50. Output shaft 90 protruding from the) and a power transmission unit 80 for transmitting the rotational force of the motor 70 to the output shaft (90).

The case 50 has a motor 70 and a power transmission unit 80 is seated, the motor 70 and the power transmission unit 80 is seated on different surfaces, the first case 10 and the first case ( 10 is coupled to the second case 20 to restrain the power transmission unit 80, and coupled to the first case 10 includes a motor case 30 to restrain the motor 70.

Since the motor 70 and the power transmission unit 80 are installed on different surfaces of the first case 10, the interference between the motor 70 and the power transmission unit 80 does not occur, and the power transmission unit 80 is provided. Since the position or mounting method of the motor 70 does not have to be taken into consideration when designing the installation position of the), the degree of freedom of design is improved.

A motor insertion part 12 into which the motor 70 is inserted is formed on an outer wall of the first case 10, and a power transmission part 80 is formed on an inner wall of the first case 10 opposite to the motor insertion part 12. Rotating groove 16 is rotatably inserted.

Accordingly, when the motor 70 and the power transmission unit 80 are seated on the first case 10, the motor 70 and the power transmission unit 80 overlap with each other when viewed in plan view. Since the power transmission unit 80 is installed on the outer wall and the inner wall of the first case 10, that is, in different spaces, the distance between the rotation shaft 72 and the power transmission unit 80 of the motor 70 can be reduced. The size of 50 can be reduced.

In addition, since the motor 70 is constrained to the outer wall of the first case 10 by the motor case 30, when the motor 70 is installed in the first case 10, the motor 70 is rotated by the rotation groove 16. Since the installation of the interference groove 16 can be designed to be close to the rotary shaft 72 of the motor 70.

Since the cutting part 13 is formed in the motor insertion part 12 through which the rotation shaft 72 of the motor 70 penetrates, the rotation shaft 72 extending from the motor 70 installed on the outer wall of the first case 10 is cut. Since it penetrates the portion 13 and extends into the first case 10, the first transmission unit 10 may be engaged with the power transmission unit 80 installed on the inner wall of the first case 10.

Directional protrusions 14 are formed on the outer wall of the motor insertion part 12, and a direction groove part 76 is formed on the motor 70 that faces the direction protrusions 14, so that the motor 70 is inserted into the motor insertion part 12. The motor 70 is coupled to the motor inserting portion 12 when a torsion occurs in the rotation shaft 72 of the motor 70 by the rotational force generated by the motor 70. Deviation from can be suppressed.

Constraints 74 are formed on the rotation shaft 72 of the motor 70, and the constraining groove 74 is inserted into the pinion 78 to which the rotation shaft 72 is coupled to restrain the rotation of the pinion 78. 79 is formed.

The outer diameter of the rotation shaft 72 of the motor 70 is smaller than the inner diameter of the pinion 78. Therefore, the pinion 78 can be easily inserted into the rotation shaft 72, so that the pinion 78 can be easily assembled.

The constraining protrusion 74 and the constraining groove 79 have a cross-sectional shape in a semicircle or polygonal shape, and since the cross-sectional area of the constraining groove 79 is formed larger than the cross-sectional area of the constraining protrusion 74, the insertion of the constraining protrusion 74 is difficult. It is easily done, and the rotating shaft 72 and the pinion 78 of the motor 70 are rotated at the same time.

The second case 20 facing the pinion 78 is formed with a support 22 for rotatably supporting the pinion 78, and a ball 24 contacting the pinion 78 is inserted into the support 22. Therefore, the pinion 78 slidably fitted to the rotation shaft 72 of the motor 70 is prevented from being separated from the rotation shaft 72.

An output hole part 18 in which an output shaft 90 is installed is formed at one side of the inner wall of the first case 10, and a third reduction gear 86 of the power transmission part 80 to be described later is formed at the edge of the output hole part 18. A seating portion 18a into which a bearing 92 installed in the insert is inserted is formed.

Therefore, when the fixing portion 88 of the third reduction gear 86 provided with the output shaft 90 and the bearing 92 is inserted into the seating portion 18a, when the large rotational force of the predetermined value or more is transmitted to the output shaft 90, the output shaft 90 It is possible to suppress that the 90 is separated from the first case 10.

The power transmission unit 80 is installed in the rotary groove 16 of the first case 10 to be engaged with the pinion 78, and the first reduction gear 82 and the rotary groove 16 are installed in the first reduction gear. The second reduction gear 84 that is geared with the gear 82, the third reduction gear 86 is installed in the output hole portion 18, the output shaft 90 is installed, and the second reduction gear 84 is geared with the second reduction gear 84. It includes.

The first reduction gear 82 and the second reduction gear 84 are formed with threads forming the input parts 82a and 84a to which the rotational force is transmitted and the output parts 82b and 84b to which the rotational force is output, respectively. Since the diameter of the 84a and the outputs 84a and 84b and the number of threads are formed to be differential, the rotational force transmitted from the motor 70 is decelerated and transmitted to the output shaft 90.

Since the pinion 78 and the input portion 82a of the first reduction gear 82 are made of a helical gear in which the thread is inclined, the rotation shaft 72 and the first reduction gear 82 of the motor 70 are formed. The length of the contact line between the input portion 82a of the can transmit a large force, and smoothly rotates, so the noise is reduced.

Since the rotational force transmitted to the first reduction gear 82 is first decelerated while being transmitted through the output portion 82b of the first reduction gear 82, the output portion 82b of the first reduction gear 82 and the second reduction reduction The gear 84 and the third reduction gear 86 are made of spur gears whose threads are formed in the vertical direction.

The third reduction gear 86 is provided with a fixing portion 88 through which the output shaft 90 is press-fitted in the center portion, and a bearing 92 is provided on the outer circumferential surface of the fixing portion 88.

Since the output shaft 90 is formed to have a polygonal cross-sectional shape and is press-fitted to the fixing unit 88, the output shaft 90 prevents slippage between the third reduction gear 86 and the output shaft 90 so as to transmit accurate rotational force, thereby providing a bearing ( 92, the seating portion 18a, and the fixing portion 88 suppress the flow of the output shaft 90 so that the output shaft 90 is not spaced apart from the first case 10 even if a distortion occurs in the output shaft 90. do.

In addition, since the third reduction gear 86 is manufactured by sintering, the shape of the thread can be easily manufactured, and the output shaft 90 is manufactured by forging so as to be strong against torsion.

Since the pinion 78, the first reduction gear 82, the second reduction gear 84, and the third reduction gear 86 have a coating layer coated on the outer surface thereof, the strength of each thread is improved and brake operation is completed. Later, the occurrence of breakage between the threads and the threads by the rotational force transmitted from the motor 70 is suppressed.

In addition, the effect of buffering the collision between the threads at the moment of starting the power transmission or when the brake is completed and the transmission of the power is stopped can suppress noise and breakage caused by the collision between the threads. Will be.

Such a coating layer includes a fluororesin layer, which can be easily changed and implemented by those skilled in the art having the technical constitution of the present invention, and thus detailed descriptions of other embodiments will be omitted.

Looking at the operation of the actuator for an electronic parking brake apparatus according to an embodiment of the present invention configured as described above are as follows.

First, when the parking brake is driven by the driver's operation, power is applied to the motor 70 to rotate the rotation shaft 72 and the pinion 78, and the rotational force of the motor 70 transmitted through the pinion 78 is reduced. It is transmitted to the output shaft 90 along the 1st reduction gear 82, the 2nd reduction gear 84, and the 3rd reduction gear 86. As shown in FIG.

The rotational movement of the output shaft 90 is converted to the movement of the friction member (not shown) to restrain the wheel of the vehicle (not shown), thereby completing the parking brake operation of the vehicle.

At this time, the pinion 78 installed on the rotating shaft 72 of the motor 70 which rotates at a high speed is supported by the second case 20 so as to be rotatable by the support 22 and the ball 24. The pinion 78 is prevented from being separated from the rotation shaft 72 by the rotation movement.

In addition, since the pinion 78 and the input portion 82a of the first reduction gear 82 are geared in a helical gear manner, slip between the pinion 78 and the first reduction gear 82 is suppressed to achieve accurate power transmission. You lose.

The rotational force decelerated while passing through the first reduction gear 82, the second reduction gear 84, and the third reduction gear 86 is transmitted to the friction member through the output shaft 90. Although the rotation of the third reduction gear 86 and the output shaft 90 is stopped, the torque is generated in the output shaft 90 because the rotation force is transmitted from the motor 70.

At this time, the output shaft 90 is constrained by the fixing part 88, the bearing 92, and the seating part 18a so that the output shaft 90 is not spaced apart from the third reduction gear 86 and the first case 10. It is supported and the driving state of the brake device is maintained.

If the brake device or the actuator malfunctions during the operation of the actuator as described above, and the actuator is separated from the brake device, the third gear 20 may be separated from the first case 10 after the second case 20 is removed from the first case 10. 86) and the output shaft 90 can be separated to facilitate the dismantling operation.

As a result, it is possible to provide an actuator for an electronic parking brake device that is simple in structure, can be downsized, improves assembly, prevents noise, malfunction and damage, and is easy to replace or repair.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand.

In addition, the actuator installed in the electronic parking brake of the vehicle has been described as an example, but this is merely illustrative, and the actuator of the present invention may be used in a product other than the actuator installed in the electronic parking brake of the vehicle.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a perspective view showing an actuator for an electronic parking brake apparatus according to an embodiment of the present invention.

2 is a perspective view illustrating an output hole and a motor case of an actuator for an electronic parking brake apparatus according to an embodiment of the present invention.

3 is an exploded perspective view showing an actuator for an electronic parking brake apparatus according to an embodiment of the present invention.

4 is an exploded perspective view illustrating a power transmission unit of an actuator for an electronic parking brake apparatus according to an embodiment of the present invention.

5 is a plan view showing a power transmission unit of the actuator for the electronic parking brake apparatus according to an embodiment of the present invention.

6 is a cross-sectional view showing an actuator for an electronic parking brake apparatus according to an embodiment of the present invention.

7 is a perspective view illustrating a third reduction gear and an output shaft of an actuator for an electronic parking brake apparatus according to an embodiment of the present invention.

8 is an exploded perspective view showing the output shaft mounting structure of the actuator for the electronic parking brake apparatus according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

10: first case 12: motor insertion unit

14: direction projection 16: rotation hole

18: output hole 20: the second case

22: support 24: ball

30: motor case 50: case

70: motor 72: rotating shaft

74: restraining projection 76: direction groove

80: power transmission unit 82: first reduction gear

84: second reduction gear 86: third reduction gear

88: fixed part 90: output shaft

92: Bearing

Claims (5)

A first case in which a power transmission unit for transmitting the rotational force of the motor and the motor to the output shaft is seated, and the motor and the power transmission unit are seated on different surfaces; A second case coupled to the first case to constrain the power transmission unit; And A motor case coupled to the first case to constrain the motor; A restraining protrusion is formed on a rotation shaft of the motor, and a restraining groove portion is formed on the pinion to which the rotation shaft is coupled to restrain the rotation of the pinion; The second case opposite to the pinion is formed with a support for rotatably supporting the pinion, the support portion is an actuator for an electronic parking brake device, characterized in that the ball in contact with the pinion is inserted. The method of claim 1, A motor insertion part into which the motor is inserted is formed on an outer wall of the first case, and an inner groove of the first case opposite to the motor insertion part is provided with a rotation groove part into which the power transmission part is rotatably inserted. Actuator for parking brake. The method of claim 2, Directional projection is formed on the outer wall of the motor insertion portion, the actuator for the electronic parking brake device, characterized in that the direction groove is formed in the motor facing the direction projection. delete delete

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