KR20130112367A

KR20130112367A - Electric parking brake system

Info

Publication number: KR20130112367A
Application number: KR1020120034681A
Authority: KR
Inventors: 정유돈; 박병주
Original assignee: 주식회사 만도
Priority date: 2012-04-04
Filing date: 2012-04-04
Publication date: 2013-10-14

Abstract

PURPOSE: An electric parking brake device is provided to allow a user to conveniently use the electric parking brake device by using a motor for braking and improving space utilization by reducing the space of an existing parking lever. CONSTITUTION: An electric parking brake device includes a motor (110), a cycloid reducer (120), a spindle member (130), and a nut member. The motor generates a driving force for driving a rotary lever (8). The cycloid reducer amplifies the driving force by being connected to the rotary shaft of the motor. The spindle member is rotated by receiving the driving force amplified by the cycloid reducer. The nut member is connected to the end of the rotary lever by moving in a longitudinal direction of the spindle member.

Description

Electric parking brake system

The present invention relates to a parking brake device mounted on a vehicle, and more particularly to an electric parking brake device operated by a motor.

In general, the parking brake device is a device for stopping the vehicle from moving when the vehicle is parked, and serves to hold the wheel of the vehicle against rotation.

1 is a cross-sectional view showing a partial configuration of a vehicle equipped with a conventional manual parking brake device.

Referring to the drawings, a first brake shoe having a drum 1 that rotates together with a wheel of a vehicle, installed inside the drum 1, and braking the drum 1 through friction with an inner surface of the drum 1. (2) and the second brake shoe (3). In addition, an operating lever 5 is provided inside the drum 1 to push the two brake shoes 2 and 3 on both sides toward the inner surface of the drum 1 when the parking cable 4 associated with the driver's parking lever is pulled. do.

The first and second brake shoes 2, 3 are semi-circularly curved rims 2a, 3a to correspond to the inner surface of the drum 1, and the rims 2a, 3a for friction with the inner surface of the drum 1, respectively. Linings (2b, 3b) attached to the outer surface of the) and webs (2c, 3c) coupled to the inner surface of the rims (2a, 3a) for rigid reinforcement of the rims (2a, 3a).

The actuating lever 5 includes a support lever 6 having one end supporting the web 2c of the first brake shoe 2 and the other end extending toward the second brake shoe 3, and the support lever 6 in the longitudinal direction. To push the pressure member 7 while rotating by the pulling operation of the pressing member 7 and the parking cable 4 supported by the web 3c of the second brake shoe 3. Rotating lever (8) rotatably coupled to the support lever (6).

Rotating lever (8) is one end is rotatably coupled to the support lever (6) through the rotating shaft (8a), the other end extends through the back plate 10 to the outside, to the outside of the back plate (10) An end portion of the extended pivot lever 8 is provided with a hook portion 8b to connect the parking cable 4 by walking.

In addition, a portion where the other end of the pressing member 7 and the pivoting lever 8 come into contact with each other is formed of a convex curved surface.

Such a parking brake device includes a pivoting lever 8 that rotates in the direction of an arrow A about the pivotal shaft 8a when the parking cable 4 associated with the driver's parking lever (not shown) is pulled. The curved portion presses the curved portion of the pressing member 7 so that the pressing member 7 pushes the web 3c of the second brake shoe 3 toward the inner surface of the drum 1. At the same time, the support lever 6 pushes the web 2c of the first brake shoe 2 forward by the reaction force acting on the support lever 6 toward the first brake shoe 2. Therefore, the two brake shoes 2 and 3 on both sides are in close contact with the inner surface of the drum 1 to perform braking of the drum 1.

Meanwhile, reference numeral '9', which is not described, is a return spring for returning the two brake shoes 2 and 3 to their original positions when the brake is released.

In the conventional parking brake device, the rotation lever 8 rotates when the parking cable 4 is pulled, and the second brake shoe 3 is pressurized by the rotation of the rotation lever 8. Due to the phenomenon of pushing (3) in the rotational direction of the rotation lever 8, the second brake shoe 3 is moved toward the braking direction to generate a braking force.

However, such a conventional manual parking brake device has the inconvenience that the driver should pull the parking lever with an appropriate force, the operation radius of the parking lever is large, there is a problem that the utilization of the interior space of the vehicle is inferior.

In order to solve the various disadvantages of the manual parking brake, an electric parking brake that automatically operates the brake using a motor has been proposed, which improves the usability of the installation space, the compactness of the structure, and the improvement of the operating performance. Various research and development are being done to.

The present invention has been made in view of the above technical background, and the connection between the structure and components of each component, such as a motor for generating a driving force, a gear for transmitting the driving force, and a screw-nut member for converting the rotational movement into a linear movement. The purpose of the present invention is to provide an electric parking brake device that can be used more smoothly and stably by improving the structure, and that the parts of the existing parking brake device can be used in common with little or no change.

In order to achieve the above object, the motorized parking brake apparatus according to an aspect of the present invention, a drum that rotates with the wheel of the vehicle, the first and second brakes respectively installed on both sides of the drum for braking the drum A parking brake device comprising a shoe, an actuating lever supporting two brake shoes and pushing the two brake shoes to an inner surface of a drum when the pivoting lever is pulled, the motor generating a driving force for driving the pivoting lever; A cycloid reducer connected to the rotation shaft of the motor to amplify the driving force; A spindle member connected to the cycloid reducer and rotating to form a male thread; And a nut member having a female screw portion that is screwed to allow a linear movement to the male screw portion of the spindle member. The nut member is provided with a lever pin fitted to and engaged with a ring portion formed at an end of the pivot lever.

In addition, the cycloid reducer, the eccentric rotation unit is coupled to the rotary shaft of the motor to transfer the rotation eccentrically; A cycloid gear provided at the center of the eccentric rotation part and having a plurality of through holes radially from the center thereof and eccentrically rotating by the eccentric rotation part; An internal gear formed in engagement with an outer surface of the cycloid gear and allowing the cycloid gear to revolve and rotate by rotation of the rotary shaft; And an output shaft inserted into a plurality of through holes, respectively, to compensate for the eccentric center of the cycloidal gear.

In addition, the internal gear may be fixed to the motor to prevent rotation.

In addition, a bearing may be installed between the cycloid gear and the eccentric rotation part.

The spindle member may further include a spindle shaft having a predetermined length and having a male screw portion formed on an outer circumferential surface thereof; And a flange portion protruding radially from the other end portion of the spindle shaft, wherein the flange portion has a coupling hole formed at a position corresponding to the through hole, and coupled to the output shaft.

In addition, at one end of the spindle shaft may be provided with a polygonal connecting shaft protruding outward from the portion of the male screw formed to rotate the spindle shaft manually from the outside.

The electric parking brake apparatus according to the present invention can be conveniently used by braking using a motor, as well as to reduce the space of the conventional parking lever provided in the driver's seat can improve the space utilization. That is, the assembly of the vehicle can be improved by eliminating the conventional parking cable.

In addition, by using the cycloid reducer, high deceleration is possible, as well as by combining the motor and the cycloid reducer and the spindle member in series to minimize the overall length can provide a compact coupling structure and improve the space utilization.

In addition, by directly installing and using the conventional parking brake device, there is an effect that the existing vehicle parts can be applied with almost no modification.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in detail with reference to the following drawings, which illustrate preferred embodiments of the present invention, and thus the technical idea of the present invention should not be construed as being limited thereto.
1 is a cross-sectional view schematically showing the configuration of a conventional parking brake device.
2 is a cross-sectional view schematically showing the configuration of an electric parking brake apparatus according to a preferred embodiment of the present invention.
3 is an exploded perspective view showing an actuator provided in the electric parking brake apparatus according to the preferred embodiment of the present invention.
4 is a cross-sectional view showing a braking state of the electric parking brake apparatus according to the preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

2 is a cross-sectional view schematically showing the configuration of an electric parking brake apparatus according to a preferred embodiment of the present invention. Here, the same reference numerals as in the drawings of the conventional parking brake apparatus described above refer to members having the same function.

As shown in FIG. 2, the electric parking brake apparatus 100 according to the present invention includes a drum 1 that rotates together with a wheel (not shown) of a vehicle and a drum 1 that is installed inside the drum 1. The first brake shoe 2 and the second brake shoe 3, which brake the drum 1 through friction with the inner surface, and the two brake shoes 2 and 3 on both sides when the pivoting lever 8 is pulled out. An operating lever 5 for pushing toward the inner surface of the drum 1, a motor 110 for generating a driving force for driving the pivoting lever 8, a reducer 120 connected to the motor 110, and the reducer Actuator unit consisting of a spindle member 130 is rotated by receiving the driving force amplified by 120, and the nut member 140 for converting the rotational force of the actuator unit to a linear reciprocating motion to move the pivoting lever (8) do.

In the electric parking brake apparatus 100 having the above configuration, the operating lever 5 for pressing the first and second brake shoes 2, 3 to the inner surface of the drum 1 to generate a braking force is conventionally known. Since the configuration and operation are the same, a detailed description thereof will be omitted.

As described above, the actuator unit includes a motor 110, a reducer 120 connected to the motor 110, and a spindle member 130 connected to the reducer 120. Such an actuator unit is shown in FIG. 3.

Referring to the drawings, the motor 110 has a rotating shaft 111, and generates a driving force for driving the rotation lever (8). In this case, as shown in the drawing, the other end of the pivoting lever 8 extends through the back plate 10, and the lever pin 148 described later may be inserted into an end extending outward of the back plate 10. The ring part 8b is provided so that it may be.

On the other hand, the motor 110 is connected to a control device (not shown) for controlling the motor 110 is controlled its operation. For example, the control device controls various operations of the motor 110 such as driving and stopping of the motor 110, forward rotation, reverse rotation, and the like through an input signal transmitted according to an operation command of an operation switch of a driver. When the brake operation command or the brake release command is applied by the driver, the control unit rotates the motor 110 in the forward or reverse direction. In addition, the control device is provided with a load sensor (not shown) for detecting the magnitude of the force applied to the rotation lever 8, the force applied to the rotation lever 8 by receiving a signal output from the load sensor When the predetermined size or more may be made to stop the motor (110).

The reducer 120 is connected to the rotary shaft 111 and serves to amplify the driving force. The reducer according to the present invention uses the cycloid reducer 120. Thus, hereinafter, the reducer is referred to as a cycloid reducer 120.

The cycloidal reducer 120 is coupled to the rotary shaft 111 of the motor 110, the eccentric rotation part 121 to eccentrically rotate, the eccentric rotation by the eccentric rotation part 121, the cycloid gear 123, the cycloid gear 123 And an internal gear 125 for engaging the outer surface of the cycloid gear 123 to rotate and rotate, and an output shaft 126 provided in each of the plurality of through holes 124 formed in the cycloid gear 123.

The eccentric rotation part 121 has a hole in which the rotation shaft 111 of the motor 110 is inserted and coupled to be eccentrically rotated so as to be eccentric from the center.

The cycloidal gear 123 is eccentrically rotated 121 is installed in the center thereof is eccentrically rotated. At this time, the eccentric rotation part 121 is connected to the cycloid gear 123 by the bearing 122. That is, the bearing 122 is provided between the cycloid gear 123 and the eccentric rotation part 121.

The cycloid gear 123 is formed with a plurality of through holes 124 radially with respect to the center. As shown, six through holes 124 are formed in the cycloid gear 123 to have a predetermined interval. Here, the number of the through holes 124 may be selectively increased or decreased according to the capacity, and the through holes 124 have the same amount of eccentricity as the eccentric rotation part 121 to compensate for the eccentric center of the cycloid gear 123. An output shaft 126 is provided.

The internal gear 125 has the same cycloid curve as the teeth of the cycloid gear 123 to engage the outer surface of the cycloid gear 123. The internal gear 125 is fixed to the motor 110 so that the cycloidal gear 123 rotates and rotates during eccentric rotation.

One end of the output shaft 126 is rotatably inserted into the through hole 124 of the cycloid gear 123, and the other end of the output shaft 126 is fitted into the coupling hole 134 of the spindle member 130 to be described later. That is, the spindle member 130 is connected to the cycloid gear 123 by the output shaft 126 to rotate. At this time, the output shaft 126 may be configured in one piece coupled to the coupling hole 134 of the spindle member 130.

When the cycloidal gear reducer 120 rotates the eccentric rotation part 121 connected to the rotary shaft 111 of the motor 110, the cycloidal gear 123 connected to the bearing 122 performs an orbital motion in the inner gear 125. While rotating according to the difference between the number of teeth formed in the inner gear 125 and the number of teeth formed in the cycloid gear 123.

For example, when the cycloid gear 123 is rotated clockwise by the eccentric rotation part 121, the inner gear 125 is engaged with the inner gear 125 even though the cycloid gear 123 itself rotates in the clockwise direction. Rotating counterclockwise along the inner side.

That is, since the amount of rotation of the cycloid gear 123 rotates is the number of revolutions that are output after deceleration, the deceleration using the cycloid gear 123 is transmitted to the spindle member 130. Accordingly, the output shaft 126 is connected to the through hole 124 of the cycloid gear 123 to cancel the swing of the idle motion, and the spindle member 130 is rotated on the same line as the rotation shaft 111 of the motor 110. It becomes possible. That is, as the output shaft 126 is made to rotate synchronously with the idle of the cycloid gear 123, the rotational force transmitted from the cycloid gear 123 is rotated 111 and the rotating shaft 111 of the motor 110 It rotates by receiving rotational force on the same line.

According to the present invention, by adopting the structure of the cycloid reducer 120 described above, the contact ratio of the gear is significantly higher than the conventional planetary gear assembly or the combination of spur gears, so that a higher output torque can be obtained, and the planetary Compared with the gear assembly of the gear, the thickness and the number of gear parts can be reduced to reduce the overall length of the actuator.

The spindle member 130 extends radially from the spindle shaft 131 having a predetermined length, the connecting shaft 132 protruding from one end of the spindle shaft 131, and the other end of the spindle shaft 131. The flange 133 is provided.

The spindle shaft 131 has a male screw portion 131a formed on an outer circumferential surface thereof, and is screwed with a female screw portion (not shown) formed in a coupling hole (not shown) of the nut member 140 to be described later. Accordingly, as the spindle shaft 131 rotates, the nut member 140 moves along the longitudinal direction of the spindle shaft 131.

The connecting shaft 132 is provided to release the braking by manually rotating the spindle shaft 131 by using a separate tool (not shown) when an abnormal operation state, that is, braking of the motor 110 is impossible. It is preferable that the connecting shaft 132 has a hexagonal cross section, and if the cross section can be rotated by being inserted into a separate tool, the cross section may have various polygonal shapes such as triangle and square.

The flange portion 133 is provided to be directly coupled to the cycloid reducer 120, the coupling portion 134 is formed in a position corresponding to the through hole 124 in the flange portion 133, the cycloid gear 123 It is coupled with the drill shaft 126 installed. As described above, the spindle member 130 rotates the shaft of the motor 110 as the output shaft 126 is synchronously rotated with the idle of the cycloid gear 123 to transmit the rotational force transmitted from the cycloid gear 123 in which the output shaft 126 is eccentrically rotated. It is possible to rotate on the same line as (111).

The nut member 140 moves along the longitudinal direction of the spindle member 130 and is coupled to the end of the rotation lever 8. In the center of the nut member 140 is formed through a coupling hole (not shown) formed with a female screw portion (not shown) that is screwed to allow the linear movement of each other to the male screw portion (131a) of the spindle shaft 131, At one end, a lever pin 148 is installed to be caught by the ring portion 8b of the rotation lever 8. Thus, the nut member 140 moves along the longitudinal direction of the spindle shaft 131 to operate the pivoting lever 8.

Then, the braking operation of the electric parking brake device as described above will be described.

As shown in FIG. 2, the driver of the vehicle in a state in which the two brake shoes 2 and 3 are spaced apart from the inner surface of the drum 1 (the brake is released) is controlled by a control device (not shown), for example, an operation switch ( When not shown), the motor 110 rotates in accordance with its signal to generate a driving force. That is, the cycloid reducer 120 that receives the rotational force of the motor 110 is eccentrically rotated to decelerate, and transmits the rotational force to the spindle member 130 connected to the cycloidal reducer 120. Therefore, when the nut member 140 coupled to the spindle member 130 moves forward and presses the rotation lever 8, as shown in FIG. 4, the rotation lever 8 rotates the rotation shaft 8a. Rotate in the direction of arrow A.

Here, the rotating lever 8 is rotated so that the curved portion of the rotating lever 8 presses the curved portion of the pressing member 7 so that the pressing member 7 drives the web 3c of the second brake shoe 3 to the drum 1. ) And pushes the web 2c of the first brake shoe 2 while advancing the support brake 6 toward the first brake shoe 2 by the reaction force acting on the support lever 6 at the same time. Braking is achieved by

On the other hand, when the braking force is released, the nut member 140 is moved to its original position as the spindle member 130 is rotated in the opposite direction during braking, and the two brake shoes 2 and 3 of the return spring 9 It is restored to its original state while being spaced apart from the inner surface of the drum 1 by elasticity.

The electric parking brake apparatus 100 as described above has an effect that the actuator unit and the nut member 140 may be used without changing or minimizing the components used in the conventional parking brake apparatus. In addition, since the manually operated parking cable and the parking lever (hand brake or foot brake) can be deleted, the space utilization can be improved and can be conveniently used.

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 exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: electric parking brake device 110: motor
111: rotating shaft 120: cycloidal reducer
121: eccentric rotation part 122: bearing
123: cycloidal gear 125: internal gear
126: output shaft 130: spindle member
131: spindle shaft 132: connecting shaft
133: flange 140: nut member
148: lever pin

Claims

A drum rotating together with a wheel of a vehicle, first and second brake shoes respectively installed on both sides of the drum for braking of the drum, supporting two brake shoes, and when the pivoting lever is pulled, two brake shoes are applied to the inner surface of the drum. In the parking brake device including an operating lever for pushing the
A motor generating a driving force for driving the pivot lever;
A cycloid reducer connected to the rotation shaft of the motor to amplify the driving force;
A spindle member connected to the cycloid reducer and rotating to form a male thread; And
And a nut member having a female screw portion that is screwed to allow a linear movement to the male screw portion of the spindle member.
The nut member is an electric parking brake device, characterized in that the lever pin is fitted is coupled to the ring portion formed at the end of the rotation lever.

The method of claim 1,
The cycloid reducer,
An eccentric rotation unit which is coupled to the rotation shaft of the motor to transmit the rotation eccentrically;
A cycloid gear provided at the center of the eccentric rotation part and having a plurality of through holes radially from the center thereof and eccentrically rotating by the eccentric rotation part;
An internal gear formed in engagement with an outer surface of the cycloid gear and allowing the cycloid gear to revolve and rotate by rotation of the rotary shaft; And
And an output shaft inserted into each of the plurality of through-holes to compensate for the eccentric center of the cycloidal gear.

3. The method of claim 2,
The internal gear of the electric parking brake, characterized in that fixed to the motor to prevent rotation.

3. The method of claim 2,
Electric parking brake device characterized in that the bearing is installed between the cycloid gear and the eccentric rotation.

3. The method of claim 2,
The spindle member,
A spindle shaft having a predetermined length and having an external thread formed on an outer circumferential surface thereof; And
And a flange portion protruding radially from the other end portion of the spindle shaft,
The flange portion is an electric parking brake device characterized in that the coupling hole is formed in a position corresponding to the through hole is coupled to the output shaft.

The method of claim 5,
One end of the spindle shaft is an electric parking brake device, characterized in that the connection shaft is formed in a polygonal shape projecting outward from the portion formed with a male screw portion to rotate the spindle shaft manually from the outside.