KR101305986B1 - Electrical parking brake - Google Patents

Abstract

PURPOSE: An electronic parking brake for a vehicle is provided to prevent a cable operation member from being rotated during reciprocation when a brake is operated or stopped. CONSTITUTION: An electronic parking brake (100) comprises a drum assembly (110), a housing (120), a cable operating member (130), a driven gear (140), a driving gear (150), a driving unit (160), and a rotation preventing device (170). The drum assembly generates a frictional force between a drum (111) and a lining and brakes wheels. The housing is connected to the rear surface of the drum by penetrating the drum of the drum assembly. The cable operating member is connected to the driven gear and pushes or pulls a parking cable by being moved forward and backward by the rotation of the driven gear. The driven gear is installed on a space unit of the housing and is rotated by being connected to the driving gear. The driving gear is rotated by being connected to a driving shaft (161) of the driving unit. The driving unit is arranged on the outer periphery of the drum assembly and generates a driving force for braking of the parking brake. The rotation preventing device includes a guide slot (171) and a rotation preventing member (172). The guide slot is formed on the cable operating member in the longitudinal direction. The rotation preventing device is supported on the inner side surface of the housing by protruding from both sides of the guide slot and prevents the cable operating member from being rotated by the rotatory force of the driven gear.

Description

Electronic Parking Brake for Cars {ELECTRICAL PARKING BRAKE}

The present invention relates to an electronic parking brake for a vehicle, and more particularly, to an electronic parking brake for a vehicle that can easily operate the parking brake using a driving force of a motor.

In general, the parking brake of the vehicle is a device that serves to brake the rear wheel or the front wheel of the vehicle to maintain the parking state when the vehicle is parked.

This parking brake is activated by the driver pulling the parking lever provided on the side of the driver's seat. The parking brake is connected to the brake shoe of the brake assembly through the wire. When the driver pulls the parking lever, the brake shoe is in close contact with the drum and generates braking force. In this state, the parking lever is pressed until the release button provided on the parking lever is pressed. Since it does not return to the original position, the parking state is maintained.

This parking brake has a problem that the driver has to operate the parking lever every time the vehicle is parked or starts to operate, which is difficult to use for a female driver or an elderly person who is weak in use.

In order to solve this problem, an electronic parking brake (EPB) that electronically controls the driving of the parking brake has recently been used. The electronic parking brake drives the motor based on the sensing signals received from various sensors, and the cable connected to the brake shoe that acts as a brake due to the motor's driving force comes into contact with the drum and is pulled or released. have.

Such an electronic parking brake is disclosed in Korean Patent Registration No. 10-0596112 (Patent Document 1) and Korean Patent Publication No. 10-2012-0088995 (Patent Document 2).

1 and 2 illustrate an example of a conventional electronic parking brake.

The conventional electronic parking brake 1 is connected to the drum assembly 2, the housing 3 coupled to the drum assembly 2, the cable 2a to the drum assembly 2, and reciprocated inside the housing 3. Worm wheel screwed to the bolt screw (4), the rotating screw 5, which is screwed to the bolt screw (4) rotatably coupled to the housing 3, the rotating member (5) and gear teeth (6a) is provided on the outer peripheral surface Gear 6, a worm gear 7 corresponding to the worm wheel gear 6, a drive motor 8 for rotating the worm gear (7).

The housing 3 has a space portion formed therein, and one end thereof is coupled to the drum assembly 2. The bolt screw 4 is fitted in the inner space of the housing 3 so as to reciprocate. The rotating member 5 is rotatably coupled to the other open end of the housing 3.

The end of the bolt screw 4 is connected to a cable 2a which is connected to the shoe of the drum assembly 2. Accordingly, the bolt screw 4 is pulled or released while the rotary member 5 is rotated by the drive motor 8 while being reciprocated in the space portion of the housing 3.

That is, when the rotating member 5 is rotated, the bolt screw 4 screwed to the rotating member 5 is configured to linearly move. At this time, the guide portion 4a provided at the end of the bolt screw 4 is guided to the inner circumferential surface of the housing 3 to prevent the bolt screw 4 from rotating together with the rotating member 5.

However, in order to prevent the bolt screw 4 from being rotated while being linearly moved by the rotation of the rotary member 5 in the conventional electronic parking brake 1, the cross section of the guide portion 4a provided in the bolt screw 4 It is formed in the same shape as the cross section of the space part of the housing 3. Therefore, as the guide portion 4a of the bolt screw 4 contacts the inner surface of the housing 3 when the bolt screw 4 is linearly moved, the movement of the bolt screw 4 is not smooth, and the bolt screw 4 is connected to the housing ( There was a problem that the phenomenon occurs that the submerged on the inner surface of 3).

In addition, when surface treatment is performed to smooth the surface of the guide portion 4a to reduce friction between the guide portion 4a of the bolt screw 4 and the inner surface of the housing 3, the product cost increases due to the surface treatment. There is a problem that a separate process is added to reduce the production efficiency of the product.

Korean Patent Registration No. 10-0596112 Korean Patent Laid-Open Patent Publication 10-2012-0088995

Therefore, the present invention has been made in order to solve the above problems, the cable operating member for pulling the parking cable is configured so as not to contact the inner peripheral surface of the housing, and supported by the anti-rotation member penetrated to the cable operating member, the brake It is an object of the present invention to provide an electronic parking brake for a vehicle, which can prevent the cable operating member from rotating during reciprocating movement.

The present invention for achieving the above object, the drum assembly for braking the wheel, generating a driving force for braking the wheel, the drive unit coupled to the drum assembly, the drive gear is coupled to the drive shaft of the drive unit is rotated And a driven gear geared to the drive gear and rotated, a housing coupled to the drum assembly, one end of which the driven gear is coupled, and a gear geared to the driven gear, the front and rear of the housing being driven by rotation of the driven gear. And a cable actuating member for driving the parking cable of the drum assembly, and supported by the housing and movably coupled to the cable actuating member to prevent the cable actuating member from rotating inside the housing when the cable actuating member is actuated. And an anti-rotation member.

In addition, the cable actuating member penetrates the anti-rotation member so that both ends of the anti-rotation member are supported on the inner circumferential surface of the housing, and preferably includes a guide slot for sliding the anti-rotation member during reciprocating movement of the cable actuating member.

In addition, the anti-rotation member is preferably formed in a circular cross section so as to be rotated when the reciprocating movement and slide in the guide slot during the operation of the cable operating member.

In addition, it is preferable that a support groove is formed inside the housing to rotatably support the rotation preventing member.

In addition, the driven gear preferably includes a shaft member screwed to the cable operating member, and a rotating member fitted to the outside of the shaft member, the gear member geared to the drive gear on the outer peripheral surface.

In addition, the shaft member and the rotating member is preferably provided with a plane for preventing the rotating member from screwing on the shaft member when the rotating member is coupled to the outer side of the shaft member.

According to the present invention, the outer circumferential surface of the cable operating member is configured not to contact the inner circumferential surface of the housing, and the fixing pin penetrated to the cable operating member is supported on the inner circumferential surface of the housing, so that the cable activating member is connected to the inner circumferential surface of the housing during brake operation. The contact efficiency can be prevented from being reduced and the locking phenomenon can be eliminated.

1 is a perspective view showing a conventional electronic parking brake for a vehicle.
2 is a cross-sectional view taken along AA of FIG. 1.
Figure 3 is an exploded perspective view showing an electronic parking brake for a vehicle according to an embodiment of the present invention.
4 is a cross-sectional view showing a coupling structure of the bolt screw and the housing in the electronic parking brake of FIG.
5 is a cross-sectional view taken along line BB of FIG. 4.
6 is a cross-sectional view of the braking force is generated in the electronic parking brake for a vehicle according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

3 is an exploded perspective view showing an electronic parking brake for a vehicle according to an embodiment of the present invention, Figure 4 is a cross-sectional view showing a coupling structure of the bolt screw and the housing in the electronic parking brake of FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4, and FIG. 6 is a cross-sectional view showing a state in which a braking force is generated in the electronic parking brake according to an embodiment of the present invention.

As shown, the vehicle electronic parking brake 100 according to an embodiment of the present invention, the drum assembly 110, the housing 120, the cable operating member 130, the driven gear 140, the drive gear 150 ), The driving unit 160, the anti-rotation mechanism 170.

First, the drum assembly 110 is pulled in conjunction with the operating lever when the parking cable 112 is pulled, the lining connected to the operating lever is in close contact with the drum 111, thereby providing a friction force between the drum 111 and the lining To brake the wheel.

The housing 120 has a space 121 formed therein, and both ends thereof are formed to penetrate each other. One end of the housing 120 penetrates through the drum 111 of the drum assembly and is coupled to the rear surface of the drum 111.

The space 121 of the housing 120 is formed to be larger than the outer diameter of the cable operating member 130 so that the cable operating member 130 to be described later is accommodated forward and backward. That is, the inner diameter of the space 121 is formed larger than the outer diameter of the cable operating member 130 so that the cable operating member 130 does not contact the inner circumferential surface of the space 121 when the cable operating member 130 moves forward and backward. Will be.

The outer side of the housing 120 is formed with a fixing portion 122 for fixing the housing 120 to the drum assembly 110 or a peripheral component with a fastening member. The fixing part 122 may be formed by protruding from the outer circumferential surface of the housing 120 or by forming a flange around the outer circumference of the other end.

The cable operation member 130 is connected to the parking cable 112 at one end, and coupled to the shaft member 141 of the driven gear 140, which will be described later, on the other end, and is moved back and forth by the rotation of the shaft member 141. The parking cable 112 serves to pull or release.

One end of the cable operating member 130 is inserted into the housing 120 and is connected to the parking cable 112 that is inserted into the housing 120 through the drum 111 of the drum assembly 110. The other end of the cable operating member 130 protrudes to the other end of the housing 120 and is coupled to the shaft member 141 of the driven gear 140 to be described later.

The cable actuating member 130 is screwed with the driven gear 140 to be described later, so that the parking cable 112 is pulled or released while the driven gear 140 rotates to operate the parking brake 100. To turn it off or to deactivate it. The cable operating member 130 is composed of a bolt screw is formed on the outer peripheral surface.

The driven gear 140 is screwed to the other end of the cable operation member 130 which is mounted in the space of the housing 120 and protrudes to the other end of the housing 120, and is rotated by the driving unit 160 to be described later. The cable operating member 130 serves to move forward and backward.

The driven gear 140 includes a shaft member 141 which is screwed to the outer circumferential surface of the cable operating member 130, and a rotating member 142 that is coupled to the outer circumferential surface of the shaft member 141 but provided with gear teeth on the outer circumferential surface thereof. .

The shaft member 141 is inserted into and fixed to the inside of the rotating member 142, and is configured to rotate together with the rotating member 142 when the rotating member 142 is rotated by the drive gear 150 to be described later. That is, a plane is formed on the outer circumferential surface of the shaft member 141, and a plane corresponding to the plane of the shaft member 141 is formed on the inner circumferential surface of the rotating member 142, so that the plane and the rotating member 142 of the shaft member 141 are formed. When the rotating member 142 is rotated by the plane of the shaft member 141 is rotated together with the rotating member 142 without turning.

Here, the shaft member 141 and the rotating member 142 may be integrally configured, but in view of the difficulty of processing and molding, it is preferable to combine them after each configuration.

The driven gear 140 is rotated by the drive gear 150 coupled to the drive shaft 161 of the drive unit 160 to be described later. When the driven gear 140 is rotated by the rotation of the drive gear 150, it is preferable that the driven gear 140 is rotatably supported by the housing 120 to be rotated in place.

The drive gear 150 is coupled to the drive shaft of the motor and is configured to rotate together with the drive shaft when the motor is driven. A gear tooth is formed on an outer circumferential surface of the drive gear 150, and the gear tooth is gear-coupled to the gear tooth of the driven gear 140 to transmit the rotational force of the drive unit 160 to the driven gear 140.

Here, the drive gear 150 is configured as a worm gear, and the driven gear 140 is configured as a worm wheel gear, and when transmitting the driving force of the drive unit 160 to the shaft member 141, the rotation direction of the drive shaft 161 is right angle It is configured to rotate to rotate the shaft member 141.

The driving unit 160 is provided around the outside of the drum assembly 110 and generates a driving force for braking the parking brake. The driving unit 160 is configured as a motor and generates a rotational force. The drive shaft 161 of the drive unit 160 is provided with a drive gear 150 geared to the driven gear 140 in order to linearly move the cable operating member 130 to be described later.

On the other hand, in the cable operation member 130 and the housing 120, the shaft member 141 of the driven gear 140 is rotated by the driving of the drive unit 160 when the parking brake 100 is operated or released, the cable operation When the member 130 moves forward and backward, the anti-rotation mechanism 170 is provided to prevent the cable operation member 130 from being rotated in the space of the housing 120 together with the shaft member 141.

The anti-rotation mechanism 170 penetrates through the guide slot 171 and the guide slot 171 formed in the cable operation member 130 in the longitudinal direction, and protrudes to both sides of the guide slot 171 to form the inner surface of the housing 120. It includes a rotation preventing member 172 supported in.

The guide slot 171 is formed in the cable operating member 130 in a direction in which the cable operating member 130 moves, and is formed through the outer circumferential surface of the cable operating member 130.

The anti-rotation member 172 passes through the guide slot 171 so that both ends thereof are supported by the inner surface of the housing 120 so that the driven gear 140 rotates so that the cable operating member 130 moves forward and backward. 130 is prevented from being rotated by the rotational force of the driven gear 140.

The anti-rotation member 172 is formed of a pin member that is larger than the diameter of the cable operating member 130. The anti-rotation member 172 may have a cross section in various shapes such as a circle, a triangle, a square, and the like, but the cross section may be formed in a circle so that the surface in contact with the inner circumferential surface of the guide slot 171 is minimized. Do.

The anti-rotation member 172 penetrates through the guide slot 171 of the cable operating member 130 and is fixed to the inner circumferential surface of the housing 120. In addition, the anti-rotation member 172 is rotated when supporting the inner circumferential surface of the housing 120 so that the cable operation member 130 slides in the guide slot 171 while the anti-rotation member 172 is rotated when it is reversed. It can also be configured.

An operation of the vehicle electronic parking brake according to an embodiment of the present invention having the above configuration will be briefly described with reference to FIGS. 4 and 6.

First, when the initial state before the parking brake 100 is activated, this initial state is as shown in FIG.

As shown in FIG. 6, when the vehicle is driving or temporarily stops the vehicle, the parking brake 100 is in an inoperative state. That is, in the non-operating state of the parking brake 100, one end of the cable operating member 130 is moved from the space 121 of the housing 120 toward the drum assembly 110, so that the parking cable 112 is not pulled. Lining (not shown) connected to the parking cable is not in close contact with the drum 111 refers to a state that the friction force does not work.

Afterwards, the driver operates the main brake by manipulating the operation lever or the operation button of the parking brake 100 provided in the driver's seat in order to stop the vehicle for a long time after finishing the driving of the vehicle.

Then, when the driving unit 160 operates to generate rotational force, the driving gear 150 fixed to the driving shaft 161 of the driving unit 160 rotates. Thereafter, the driven gear 140 geared to the drive gear 150 is rotated in place.

At this time, the cable operating member 130, which is screwed to the driven gear 140 and received in the space 121 of the housing 120, moves toward the opposite side of the drum assembly 110. Then, the parking cable 112 connected to one end of the cable operating member 130 is pulled away from the drum assembly 110, as shown in FIG. At this time, an operating lever (not shown) connected to the parking cable 112 is pulled, and a lining (not shown) connected with the operating lever extends toward the inner edge of the drum 111 to press the drum 111. Done.

Then, the wheel of the vehicle is braked due to the frictional force generated between the inner peripheral surface of the drum 111 and the lining.

Afterwards, the driver operates the operation lever or the operation button of the subject brake 100 to release the operation of the parking brake 100 to drive the parked vehicle.

Then, the driving unit 160 operates to generate reverse rotational power, and the driving gear 150 fixed to the driving shaft 161 of the driving unit 160 rotates in reverse. Thereafter, the driven gear 140 geared to the drive gear 150 is reversed in place.

At this time, the cable operating member 130, which is screwed to the driven gear 140 and received in the space 121 of the housing 120, moves toward the drum assembly 110. Then, the parking cable 112 connected to one end of the cable operating member 130 is released to the drum assembly 110, and as shown in FIG. At this time, the pulling of the operating lever (not shown) connected to the parking cable 112 is released. Then, the lining, which is connected to the operating lever and pressurizes the inner edge of the drum 111, falls off the drum 111, thereby releasing the braking force of the parking brake 100.

According to the electronic parking brake according to an embodiment of the present invention as described above, the outer circumferential surface of the cable operating member 130 is configured not to contact the inner circumferential surface of the housing 120, the fixing is penetrated through the cable operating member 130 Since the pin is supported on the inner circumferential surface of the housing 120, the cable actuating member 130 contacts the inner circumferential surface of the housing 120 when the brake is actuated, thereby preventing the operation efficiency from being reduced and eliminating the occurrence of the locking phenomenon. You can do it.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

100: parking brake 110: drum assembly
111: drum 112: parking cable
120 housing 121 space part
130: cable operating member
140: driven gear 141: shaft member
142: rotating member
150: drive gear
160 drive unit 161 drive shaft
170: anti-rotation mechanism 171: guide slot
172: anti-rotation member

Claims (6)

A drum assembly for braking the wheel;
A driving unit generating a driving force for braking the wheel and coupled to the drum assembly;
A drive gear coupled to the drive shaft of the drive unit and rotating;
A driven gear geared to the drive gear and rotated;
A housing coupled to the drum assembly and having one end opened to which the driven gear is coupled;
A cable actuating member gear-coupled to the driven gear and moving forward and backward in the housing by the rotation of the driven gear to operate the parking cable of the drum assembly;
A rotation preventing member supported on the housing and movably coupled to the cable operating member to prevent the cable operating member from rotating inside the housing when the cable operating member is operated;
Electronic parking brake comprising a. The method of claim 1,
Cable operation member,
The anti-rotation member is penetrated to support both ends of the anti-rotation member on the inner circumferential surface of the housing, wherein the anti-rotation member includes a guide slot for sliding the anti-rotation member during reciprocating movement of the cable operating member. The method of claim 2,
Anti-rotation member
An electronic parking brake, characterized in that it is formed in a circular cross section so as to be rotated when reciprocating and slid in the guide slot when the cable operating member is operated. The method of claim 1,
Inside the housing
Electronic parking brake, characterized in that the support groove for forming the rotation preventing member rotatably supported. The method of claim 1,
The driven gear
A shaft member screwed to the cable operating member;
A rotary member fitted to the outer side of the shaft member and having a gear tooth geared to a drive gear on an outer circumferential surface thereof;
Electronic parking brake comprising a. The method of claim 5,
In the shaft member and the rotating member,
The rotating member is coupled to the outer side of the shaft member is an electronic parking brake, characterized in that the plane is provided to prevent the rotating member from running in the shaft member when the rotating member is rotated.

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