KR101920677B1 - Electronic parking brake apparatus - Google Patents

Abstract

The present invention relates to an electronic parking brake apparatus, and more particularly, to an electronic parking brake apparatus which includes an operating lever connected to a parking cable, a brake shoe rotated to the drum side by an operating lever to frictionally contact the drum, A guide pipe connected to the back plate at one side of the back plate; a guide pipe connected to the guide pipe to convert the speed and the direction of motion of the rotary shaft of the electric motor to act on the parking cable; And a mounting bracket that is installed between the back plate and the actuator and has one side fixed to the back plate and the other side connected to the protrusion of the actuator with a clearance therebetween.

Description

[0001] ELECTRONIC PARKING BRAKE APPARATUS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic parking brake apparatus, and more particularly, to an electronic parking brake apparatus that applies a driving force of an actuator to a parking cable to implement braking of a drum brake.

The parking brake system of a vehicle is an essential safety device used for urgent braking of an automobile in an emergency situation where the vehicle can not be moved arbitrarily during a state or stop, or when the braking device can not be operated while driving.

Conventionally, a mechanical parking brake apparatus, which is mechanically operated by a force applied by a driver to a hand lever or a foot pedal, is mainly used.

In recent years, however, an electronic parking brake device (electronic parking brake) capable of improving the operational convenience and increasing the braking performance at the time of parking brake operation is mounted by operating the parking brake using the power of the actuator.

The actuator of such an electronic parking brake device implements the operation of pulling or releasing the parking cable by acting on the parking cable through the gear and the speed reducer (hereinafter referred to as "gear box") the driving force of the electric motor driven by the controller do.

The actuator converts the rotational motion of the electric motor rotary shaft to a linear motion by using the linear motion conversion gear of the gear box or the like, acts on the parking cable, restrains the pulled parking cable with a locking mechanism so as not to be released, .

A drum brake provided in an electronic parking brake apparatus uses a parking cable connected to a moving member of an actuator to rotate a brake shoe having a lining (friction material) to the drum side and frictionally contact the drum to obtain a braking force.

A related art is disclosed in Korean Patent Registration No. 0925923 (registered on Nov. 2, 2009, entitled " Electronic parking brake installation structure ").

Between the actuator and the drum brake, there is provided a mounting bracket for supporting the housing of the actuator from the back plate of the drum brake in the set direction (angle).

The mounting bracket is fixed to the back plate and the housing at a plurality of places by fastening members such as bolts or rivets.

When the vehicle is braked, a load due to the pulling of the parking cable is applied to the connection portion between the actuator and the drum brake. In this case, the position of the actuator may be momentarily slightly moved due to the load applied to the parking cable.

At this time, a load is also applied to the mounting bracket, so that the mounting bracket is deformed or damaged.

When the mounting bracket is deformed or damaged as described above, the actuator connected to the mounting bracket can not be returned to the normal position, and its position or direction is distorted.

An object of the present invention is to provide an electronic parking brake device capable of preventing a mounting bracket from being deformed or damaged by a load acting on a connection portion between an actuator and a drum brake when the vehicle is braked.

According to an aspect of the present invention, there is provided an electronic parking brake apparatus comprising: an operating lever connected to a parking cable; a brake shoe rotated toward the drum by the operating lever to frictionally contact the drum; A drum brake having a plate; A guide pipe installed at one side of the back plate so as to penetrate the back plate; An actuator coupled to the guide pipe and having a protrusion formed to protrude toward the back plate and to change the speed or the direction of motion of the rotating shaft of the electric motor to act on the parking cable; And a mounting bracket installed between the back plate and the actuator, wherein one side of the mounting bracket is fixed to the back plate and the other side of the mounting bracket is connected to the protrusion of the actuator with a clearance therebetween.

In the present invention, the actuator includes: a gear box having a gear member for changing a speed or a moving direction of a rotating shaft of the electric motor; and a gear housing for covering the gear member; And a screw box connected to the parking cable, the screw being linearly moved in conjunction with the rotation of the gear member, and a screw housing for covering the screw and having one side portion coupled to the guide pipe.

According to an embodiment of the present invention, the projecting portion may include a base portion protruding from the outer surface portion of the actuator toward the back plate and having a block shape; An extension portion protruding from the end of the base portion toward the back plate; And an extension connected to an end of the extension with a width greater than that of the extension.

In the present invention, the mounting bracket may include a bracket part having one side fixed to the back plate and the other side fitted to the projection; And an elastic clip part fitted between the extension part of the projection part and the bracket part, one side of the elastic clip part elastically contacting the protrusion part and the other side part elastically contacting the bracket part.

In the present invention, the bracket portion may include: a plate fixing portion fixed to the back plate by a fastening member; A housing connection part formed with a slot through which the expansion part can pass, the slot being inserted into the extension part and being in contact with the base part; And a bending connection portion having one side portion connected to the plate fixing portion and the other side portion bent toward the base portion side of the protrusion portion and connected to the housing connection portion.

In the present invention, the housing connection part may have a flat contact surface corresponding to an end surface of the base part, A side contact portion connected to one side portion of the cross-sectional contact portion and contacting one side portion of the base portion; And another side contact portion connected to the other side portion of the cross-sectional contact portion and contacting the other side portion of the base portion.

In the present invention, the elastic clip portion may include: a bent portion having a bent shape; And a slit portion formed to extend from one end of the bent portion to the other end portion and fitted to the extended portion of the protruding portion.

The present invention realizes a structure in which a mounting bracket for supporting an actuator at a set angle is engaged with a protrusion formed in an actuator so as to be in contact with an actuator at a clearance.

Accordingly, even if relative movement between the drum brake and the actuator occurs as the clearance between the mounting bracket and the protruding portion is generated, the binding state between the mounting bracket and the actuator can be stably maintained.

That is, according to the present invention, even when the relative position between the drum brake and the actuator changes momentarily due to the load applied to the parking cable during braking of the vehicle, the mounting bracket is not deformed or damaged and the connection state between the drum brake and the actuator can be stably maintained .

1 is a perspective view illustrating an electronic parking brake apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the electronic parking brake apparatus according to an embodiment of the present invention in another direction. FIG.
3 is a perspective view illustrating a connection between a drum brake and an actuator of an electronic parking brake apparatus according to an embodiment of the present invention.
4 is a perspective view illustrating a screw box of an electronic parking brake apparatus according to an embodiment of the present invention.
5 is a perspective view illustrating a bracket portion of a mounting bracket of an electronic parking brake apparatus according to an embodiment of the present invention.
6 is a perspective view illustrating an elastic clip portion of a mounting bracket of an electronic parking brake apparatus according to an embodiment of the present invention.
7 is a perspective view illustrating a process of fitting a bracket portion of a mounting bracket to a protrusion of an actuator of an electronic parking brake apparatus according to an embodiment of the present invention.
FIG. 8 is a perspective view illustrating a process of fitting an elastic clip portion of a mounting bracket to a protruding portion of an actuator of an electronic parking brake apparatus according to an embodiment of the present invention.

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

FIG. 1 is a perspective view showing an electronic parking brake apparatus according to an embodiment of the present invention in various directions, FIG. 3 is a perspective view showing a connection between a drum brake and an actuator of an electronic parking brake apparatus according to an embodiment of the present invention. It is a perspective.

FIG. 4 is a perspective view of a screw box of an electronic parking brake apparatus according to an embodiment of the present invention, and FIGS. 5 and 6 are views showing a bracket portion of a mounting bracket of the electronic parking brake apparatus, Respectively.

FIGS. 7 and 8 are perspective views illustrating a process of fitting a bracket portion of a mounting bracket to a protruding portion of an actuator of an electronic parking brake device according to an embodiment of the present invention, and a process of fitting the elastic clip portion.

1 and 2, an electronic parking brake apparatus 100 according to an embodiment of the present invention includes a drum brake 130, a guide pipe 140, an actuator 150, and a mounting bracket 190.

The drum brake 130 includes a brake shoe 132, a back plate 133, an operation lever 134, and a lining (friction material) 135.

The brake shoe 132 is positioned inside the drum 120 rotated together with the wheel, and the lining 135 is attached to the contact portion with the drum 120.

The brake shoe 132 is rotatably mounted on the back flake 133 and is disposed in the outward direction in contact with the drum 120 by the rotation of the operation lever 134 connected to the parking cable 180, And is rotated in the inward direction to be spaced apart.

When the parking cable 180 is pulled, the operation lever 134 is rotated, the brake shoe 132 is rotated in the outward direction, and frictionally contacts the drum 120 to restrain and brake the rotation of the wheel.

The guide pipe 140 has a pipe shape and is installed through the back plate 133 at one side of the back plate 133 connected to the actuator 150.

The guide pipe 140 is formed to extend from the back plate 133 to the gear box 152 side with a relative angle to the back plate 133.

One side of the parking cable 180 is connected to a screw 157 which is linearly moved in the actuator 150 and the other side of the parking cable 180 is extended toward the brake shoe 132 through a guide pipe 140, do.

The actuator 150 converts the speed and the direction of motion of the rotating shaft of the electric motor 151 to act on the parking cable 180. The actuator 150 is inserted into the guide pipe 140 and connected to the drum brake 130.

A protrusion 159 protrudes toward the back plate 133 and a mounting bracket 190 is coupled to the protrusion 159. The protrusion 159 protrudes toward the side of the back plate 133,

2, an actuator 150 according to an embodiment of the present invention includes an electric motor 151, a gear box 152, a screw box 156, and a protrusion 159. As shown in FIG.

The electric motor 151 generates a driving force (braking force) in the form of a rotary motion for braking the wheel by bringing the brake shoe 132 into contact with the drum 120 in a different expression for pulling the parking cable 180.

The gear box 152 is provided with a plurality of gear members 113 and 114 for changing the speed and direction of rotation of the rotary shaft of the electric motor 151 so as to rotate the rotary shaft of the electric motor 151 and the electric motor 151 And is connected to the covering motor housing.

Referring to FIG. 2, the gear box 152 according to an embodiment of the present invention includes a worm 153, a worm gear 154, and a gear housing 155.

The worm 153 has a bar shape in which a spiral groove portion is continuously formed on the outer peripheral portion, and is connected to the rotary shaft of the electric motor 151.

The worm gear 154 is provided in a direction perpendicular to the worm 153 and has a gear tooth gear connected to the spiral outer circumferential portion of the worm 153. The worm gear 154 is rotated at a reduced speed in conjunction with the rotation of the worm 153.

The gear housing 155 has a casing structure that can protect the worm 153 and the worm gear 154 from external foreign matter and is installed outside the worm 153 and the worm gear 154.

One side of the gear housing 155 is connected to a motor housing that covers the electric motor 151 and the other side is connected to the screw housing 158 of the screw box 156.

The screw box 156 has a screw 157 that is linearly moved in conjunction with the rotation of the gear members 113 and 114 and is connected to the gear box 152. The end of the screw 157 is connected to the guide pipe 140.

Referring to FIGS. 2 and 4, the screw box 156 according to an embodiment of the present invention includes a screw 157 and a screw housing 158.

The screw 157 has a bar shape having a spiral groove formed in the outer surface thereof and is linearly moved in conjunction with the rotation of the worm gear 154 in a state in which the helical groove engages with the spiral protrusion formed on the inner peripheral portion of the worm gear 154.

For example, when the worm gear 154 rotates in the forward direction (clockwise direction), the screw 157 is moved in a direction away from the guide pipe 140. When the worm gear 154 rotates in the reverse direction (counterclockwise direction) , The screw 157 is moved toward the guide pipe 140 side.

1 and 2, one side of the parking cable 180 is connected to the screw 157 and the other side of the parking cable 180 extends to the side of the brake shoe 132 through the guide pipe 140 and is connected to the operation lever 134 .

When the worm gear 154 is rotated by the rotation of the electric motor 151, the screw 157 connected to the worm gear 154 is linearly moved in a direction away from the guide pipe 140, The operation lever 134 is rotated.

At this time, the brake shoe 132 is pushed by the operation lever 134 to rotate in the outward direction to contact the drum 120, and frictionally contact with the drum 120 to restrain and brake the rotation of the wheel.

The screw housing 158 has a casing structure for covering the screw 157 and has one side connected to the gear box 152 and the other side connected to the guide pipe 140.

Referring to FIG. 4, the screw housing 158 according to an embodiment of the present invention includes a screw receiving portion 158a and a pipe connecting portion 158b.

The screw receiving portion 158a is a portion in which the screw guide 160 guiding the movement of the screw 157 is guided by a straight path and is inserted into the gear housing 155 of the gear box 152 by a fastening member such as a bolt. Respectively.

The screw guide 160 has an inner surface shape corresponding to the outer surface of the screw 157 and is provided inside the screw receiving portion 158a and has the same cross sectional shape along the axial direction of the screw 157. [

The screw 157 is moved only in a linear path corresponding to the axial direction of the screw 157 without being arbitrarily rotated or twisted in a state of being in contact with the inner surface of the screw guide 160.

The pipe connection portion 158b is a portion where the screw housing 158 is connected to the guide pipe 140. One side portion is connected to the screw receiving portion 158a and the other side portion is fitted to the guide pipe 140.

The projection 159 protrudes toward the back plate 133 on one side of the outer surface of the screw housing 158 adjacent to the back plate 133.

4, a protrusion 159 according to an embodiment of the present invention includes a base portion 159a, an extension portion 159b, and an extension portion 159c.

The base portion 159a has a hexahedral block shape and is formed to protrude from the outer surface portion of the screw housing 158 toward the back plate 133 side.

The extending portion 159b is formed so as to project from the end of the base portion 159a toward the back plate 133 side.

The extension 159c is connected to the end of the extension 159b with an extended width than the extension 159b.

The mounting bracket 190 is disposed between the back plate 133 and the actuator 150 in order to support the actuator 150 from the back plate 133 of the drum brake 130 at a set angle Respectively.

One side of the mounting bracket 190 is fixed to the back plate 133 and the other side of the mounting bracket 190 is fitted to the protrusion 159 of the actuator 150 with a clearance to be connected to the actuator 150.

Referring to FIG. 3, a mounting bracket 190 according to an embodiment of the present invention includes a bracket portion 191 and an elastic clip portion 196.

The bracket portion 191 extends from the back plate 133 to the protrusion 159 of the actuator 150 and has one side fixed to the back plate 133 and the other side fitted to the protrusion 159.

5, the bracket part 191 according to an embodiment of the present invention includes a plate fixing part 192, a housing connection part 193, and a bending connection part 194.

The plate fixing portion 192 has a contact surface corresponding to a flat one surface portion of the back plate 133 and is fixed to the back plate 133 by a fastening member such as a rivet.

The plate fixing portion 192 has a shape branched to both sides corresponding to one side and the other side with respect to the extending direction of the bending connection portion 194.

A through hole capable of penetrating the fastening member is formed in the connection portion between the branched side portions of the plate fixing portion 192 and the bending connection portion 194 and is fixed to the back plate 133 through the fastening member.

The housing connection portion 193 has a shape corresponding to the end portion of the base portion 159a of the projection 159 and is provided in a state of being pressed against the base portion 159a.

The housing connection portion 193 is formed with a slot S through which the extended portion 159c of the projection 159 can pass.

7, the housing connection portion 193 is inserted into the protrusion 159 to a position where it contacts the base portion 159a while the slot S is positioned corresponding to the extension portion 159c, And is fixedly mounted on the projecting portion 159 with the elastic clip portion 196 sandwiched therebetween.

The housing connection portion 193 is positioned on the extension portion 159b in a state in which the housing connection portion 193 is fitted in the projection portion 159. [

A clearance is formed between the extension portion 159b having a width smaller than that of the extension portion 159c and the housing connection portion 193 because the slot S has a size allowing the extension portion 159c to pass therethrough.

Accordingly, even if the relative movement between the drum brake 130 and the actuator 150 occurs due to the clearance between the housing connecting portion 193 and the extending portion 159b, the relative movement between the mounting bracket 190 and the protruding portion 159 The structure remains unchanged.

At this time, one side of the bracket portion 191 is fixed to the back plate 133, and the other side contacting the protrusion 159 maintains the state of supporting the actuator 150 at a set angle.

That is, even if the relative position between the drum brake 130 and the actuator 150 is instantaneously changed due to the load applied to the parking cable 180 when the vehicle is braking, the mounting bracket 190 is not deformed or damaged, And the function of supporting at the set angle is continuously implemented.

In one embodiment of the present invention, the housing connection portion 193 has a cross-sectional shape including a cross-sectional contact portion 193a, a side contact portion 193b, and another side contact portion 193c.

The cross-sectional contact portion 193a has a flat contact surface corresponding to the cross-section of the base portion 159a, and the slot S is formed therethrough.

One side contact portion 193b has a contact surface corresponding to one side portion of the base portion 159a and is vertically connected to one side portion of the cross-sectional contact portion 193a.

The other side contact portion 193c has a contact surface corresponding to the other side surface portion of the base portion 159a and is vertically connected to the other side portion of the end surface contact portion 193a.

The one side contact portion 193b and the other side contact portion 193c are engaged with one side portion of the base portion 159a and the other side portion positioned on the opposite side of the base portion 159a in a state where the housing connection portion 193 is engaged with the end portion of the base portion 159a Respectively.

The relative movement between the drum brake 130 and the actuator 150 is performed only in one direction corresponding to the extension direction of the parking cable 180 and the screw 157 due to the shape of the housing connection portion 193, Relative motion in the direction is constrained.

Accordingly, it is possible to stably restrain the actuator 150 from tilting or twisting in an arbitrary direction due to an external pressing force or the like.

The bending connection portion 194 is a portion connecting the plate fixing portion 192 and the housing connection portion 193 and has one side portion connected to the plate fixing portion 192 and the other side portion bent toward the base portion 159a side of the projection 159 And is connected to the housing connection portion 193 in a shape.

The bracket portion 191 can support the actuator 150 from the back plate 133 at a predetermined angle by the shape of the bent connection portion 194. [

The elastic clip portion 196 is made of an elastic material having elasticity such as a metal material or a plastic material and has a curved shape and extends between the extension portion 159c of the projection 159 and the bracket portion 191 Respectively.

The elastic clip portion 196 is elastically deformed by the protrusion 159 in a state where the elastic clip portion 196 is sandwiched between the extension portion 159c of the protrusion 159 and the housing connection portion 193 of the bracket portion 191, And the other side portion is elastically contacted to the bracket portion 191. [

Referring to FIG. 6, an elastic clip portion 196 according to an embodiment of the present invention includes a bending portion 197, a slit portion 198, and a grip portion 199.

The bent portion 197 has a shape bent to have a width larger than the clearance between the expansion portion 159c and the housing connection portion 193 so that the plate member having a thickness thinner than the clearance between the expansion portion 159c and the housing connection portion 193 I have.

The slit portion 198 is formed to extend from one end of the bent portion 197 to the other end portion and forms a slit-shaped hole portion to be fitted into the extension portion 159b of the projection 159 as shown in Fig. 8 .

When the slit portion 198 is inserted into the extension portion 159b of the projection 159, one side portion and the other side portion of the bent portion 197 are bent by the bent shape of the bent portion 197 as described above, (159c) and the housing connection portion (193) of the bracket portion (191).

In the electronic parking brake apparatus 100 according to the embodiment of the present invention having the above-described structure, the mounting bracket 190 for supporting the actuator 150 at a set angle is provided on the protrusion 159 formed in the actuator 150 So as to realize a structure that is coupled to the actuator 150 so as to be in contact with the actuator 150.

Accordingly, even if a relative movement occurs between the drum brake 130 and the actuator 150 due to the clearance between the mounting bracket 190 and the protrusion 159, the gap between the mounting bracket 190 and the actuator 150 The binding state can be stably maintained.

That is, the present invention prevents the mounting bracket 190 from being deformed or damaged even when the relative position between the drum brake 130 and the actuator 150 is instantaneously changed due to the load applied to the parking cable 180, The connection state between the brake 130 and the actuator 150 can be stably maintained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

100: Electronic parking brake device 120: Drum
130: Drum brake 132: Brake shoe
133: back plate 134: operating lever
135: lining 140: guide pipe
150: actuator 151: electric motor
152: Gear box 153: Worm
154: Worm gear 155: Gear housing
156: screw box 157: screw
158: screw housing 158a: screw housing part
158b: pipe connecting portion 159:
159a: base portion 159b: extension portion
159c: Extension part 160: Screw guide
180: parking cable 190: mounting bracket
191: Bracket part 192: Plate fixing part
193: Housing connection part 193a:
193b: One side contact portion 193c:
194: Bending connection 196: Elastic clip part
197: bending portion 198: slit portion

Claims (7)

A drum brake having an operating lever connected to a parking cable, a brake shoe rotated to the drum side by the operating lever and in frictional contact with the drum, and a back plate rotatably installed on the brake shoe;
A guide pipe installed at one side of the back plate so as to penetrate the back plate;
An actuator coupled to the guide pipe and having a protrusion formed to protrude toward the back plate and to change the speed or the direction of motion of the rotating shaft of the electric motor to act on the parking cable; And
And a mounting bracket installed between the back plate and the actuator and having one side fixed to the back plate and another side connected to the protrusion of the actuator with a clearance,
The projection
A base portion protruding from the outer surface portion of the actuator toward the back plate, the base portion having a block shape;
An extension portion protruding from the end of the base portion toward the back plate; And
An extension having a width greater than the extension and connected to an end of the extension;
And an electronic parking brake device for parking the vehicle.
The method according to claim 1,
The actuator includes:
A gear member having a gear member for changing a speed or a moving direction of a rotating shaft of the electric motor, and a gear housing for covering the gear member; And
A screw box connected to the parking cable and linearly moved in conjunction with the rotation of the gear member, and a screw housing for covering the screw and having one side portion coupled to the guide pipe;
And an electronic parking brake device for parking the vehicle.
delete The method according to claim 1,
The mounting bracket includes:
A bracket part having one side fixed to the back plate and the other side fitted to the projection; And
An elastic clip portion fitted between the extended portion of the protrusion and the bracket portion, one side of the elastic clip portion being elastically contacted to the protrusion portion and the other side portion being elastically contacted to the bracket portion;
And an electronic parking brake device for parking the vehicle.
5. The method of claim 4,
The bracket portion
A plate fixing part fixed to the back plate by a fastening member;
A housing connection part formed with a slot through which the expansion part can pass, the slot being inserted into the extension part and being in contact with the base part; And
A bending connection portion having one side portion connected to the plate fixing portion and the other side portion bent toward the base portion side of the protrusion portion and connected to the housing connection portion;
And an electronic parking brake device for parking the vehicle.
6. The method of claim 5,
The housing connection part
A cross-sectional contact portion having a flat contact surface corresponding to an end surface portion of the base portion and having the slot formed therethrough;
A side contact portion connected to one side portion of the cross-sectional contact portion and contacting one side portion of the base portion; And
A second side contact portion connected to the other side portion of the cross section contact portion and contacting the other side portion of the base portion;
And an electronic parking brake device for parking the vehicle.
5. The method of claim 4,
The elastic clip portion includes:
A bent portion having a bent shape; And
A slit portion formed to extend from one end of the bent portion to the other end portion, the slit portion being fitted to the extended portion of the protruding portion;
And an electronic parking brake device for parking the vehicle.

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