KR101055974B1 - Electric parking brake - Google Patents

Abstract

The electric parking brake apparatus according to the present invention is connected to the brakes 21 and 22 that apply braking force to the wheels 11 and 12 of the vehicle, and the parking cables 41 and 42 to operate the brakes 21 and 22. ), A motor 110 generating a driving force for operating the parking cables 41, 42, a hollow shaft-shaped rotary shaft 111 installed through the center of the motor 110, and the rotary shaft 111 Planetary gears 132 such that the plurality of planetary gears 132 and the planetary gears 132, which are geared to the sun gear 131 so as to pivot along the circumference of the sun gear 131 and the sun gear 131 integrally coupled to the outside, are connected to the gears And an output carrier 135 connected to the planetary gears 132 so as to transmit power to the internal gear 134 and the planetary gear 132 which are disposed along the turning path of the rotary gears. The linear gear movement between the planetary gear unit 130, the screw member 141 and the screw member 141 is And a screw-nut unit 140 having nut members 146 and 148 to be screwed to each other and penetrating the rotating shaft 111 so as to enable power transmission with the carrier 135. Parking cables 41 and 42 are connected to 140 to operate the parking cables 41 and 42 by mutual linear movement of the screw members 141 and the nut members 146 and 148.

Parking brake, motor, planetary gear, screw member, nut member

Description

Electric parking brake system

1 is a perspective view schematically showing some components of a vehicle equipped with a conventional parking brake device.

2 is a front view schematically showing the configuration of an electric parking brake apparatus according to a preferred embodiment of the present invention.

3 and 4 are side views showing a partial configuration of each of the electric parking brake apparatus according to a preferred embodiment of the present invention shown in FIG.

Explanation of symbols on the main parts of the drawings

21, 22 ... Brake 41, 42 ... No. 1,2 Parking Cable

110 ... motor 111 ... rotation shaft

120 ... Emergency release unit 121 ... Warm wheel

122 Worm 130 Planetary Gear Unit

131 Sun gear 132 Planetary gear

134 Internal gear 135 Output carrier

140 Screw-nut unit 141 Screw member

142 ... slip 143 ... power connection

144,145 ... 1,2 bolts 146,148 ... 1,2 nuts

150 ... Load sensor 160 ... Control

The present invention relates to a parking brake device device mounted on a vehicle, and more particularly, to an electric parking brake device device that can be made smoothly by using a motor and a planetary gear unit to reduce the noise.

In general, the parking brake device is a device for stopping the vehicle from moving when the vehicle is parked, and applies a braking force to the wheel of the vehicle to prevent the wheel from rotating.

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

As shown in FIG. 1, the conventional parking brake apparatus includes a drum brake 21, 22 provided on each of a pair of wheels 11, 12, a parking lever 30 for driver operation, and parking. And a pair of parking cables 41 and 42 connected between the lever 30 and the respective brakes 21 and 22.

Each of the brakes 21 and 22 is, as is known, a drum that rotates together with the wheels 11 and 12, and a pair of brake shoes that are movably installed in the drum and selectively squeezed to the drum inner surface. And an operating lever for operating each brake shoe, and a restoring spring for restoring each brake shoe to its original position.

One end of each of the parking cables 41 and 42 is connected to the operating levers of the left and right brakes 21 and 22, and the other end is connected to the parking levers 41 and 42 so that the same load is applied to the left and right parking cables 41 and 42. Is coupled to an equalizer 50 connected to the < RTI ID = 0.0 >

In the conventional parking brake device having such a configuration, when the driver pulls the parking lever 30 upward, the parking cables 41 and 42 are pulled at the same time, and the operating levers of the left and right brakes 21 and 22 are applied to the respective brakes. Push the shoe towards the inner side of the drum. When the brake shoe is squeezed to the inner surface of the drum by this operation, a braking force is applied to the drum and the wheels 11 and 12, and the wheels 11 and 12 do not rotate.

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, and various research and developments have been made to improve the operation performance or reduce the operation noise. have.

The present invention has been made in view of the above point, an object of the present invention is to provide an improved electric parking brake device that can be made smoothly by using a motor and a planetary gear unit to reduce the noise.

The electric parking brake apparatus according to the present invention for achieving the above object, the parking cable 41, 42 and the parking cable 41, 42 to be connected to a brake for applying a braking force to the wheel of the vehicle to operate the brake. A rotating shaft 111 including a motor 110 generating a driving force for operating the hollow shaft, the hollow shaft being installed through the center of the motor 110; A sun gear 131 integrally coupled to the outer side of the rotation shaft 111, a plurality of planetary gears 132 geared to the sun gear 131 so as to pivot along the circumference of the sun gear 131, and the planetary gear The internal gear 134 disposed along the turning path of the planetary gears 132 to be connected to the gears 132, and the planetary gears 132 of the planetary gears 132 to transmit power to the planetary gears 132. A planetary gear unit 130 coupled to a connection member 133 installed at each center and having an output carrier 135 rotating with the same rotation center line as the rotation center line of the sun gear 131; A screw having a screw member 141 which is connected to the output carrier 135 so as to transmit power through the rotating shaft 111 and the nut member which is screwed to allow a linear movement with the screw member 141 A nut unit 140, wherein the screw member 141 is rotatably inserted into the rotary shaft 111: coupled to one end of the slip unit 142 and is output to the output carrier. Power connection portion 143 is inserted into the rotation center of the 135: First bolt portion 144 is coupled to one end of the power connection portion 143 and made of a plurality of male threads 144a having a predetermined spiral direction: and The second bolt portion 145 coupled to the other end of the slip portion 142 and composed of a plurality of male threaded portions 145a having a direction opposite to the spiral direction of the male threaded portion 144a of the first bolted portion 144: The nut member is provided with the first bolt portion 144 and b. A first nut member 146 coupled to each other and a second nut member 148 screwed to the second bolt portion 145, wherein each of the parking cables 41 and 42 is connected to the first and second bolt members 148. The parking cable 41 is coupled to each end of the second nut member 146 and 148 by the mutual linear movement of the screw member 141 and the nut member by the rotation of the output carrier 135. 42 is operated, the power connection portion 143 of the screw member 141 is made of a shape corresponding to the non-circular center hole 135a of the cross section is provided in the center of the output carrier 135, The slip part 142 and the power connection part 143 may be slidably moved in the axial direction with respect to the rotation shaft 111 and the output carrier 135.

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In addition, the electric parking brake apparatus according to the present invention further includes an emergency release unit capable of manually rotating the rotating shaft of the motor, the emergency release unit, the worm wheel and the integrally coupled to the outer circumference of the rotating shaft It includes a worm gear-connected to the worm wheel and capable of manual operation.

In addition, at least one of the screw-nut unit and each of the parking cables is provided with a load sensor for detecting the magnitude of the force applied to each of the parking cables by the screw-nut unit.

Hereinafter, an electric parking brake apparatus according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. For reference, in the following description of the present invention, the same configuration and operation as in the prior art will be described with reference to the configuration shown in the conventional drawings.

Figure 2 is a front view schematically showing the configuration of the electric parking brake apparatus according to a preferred embodiment of the present invention, Figure 3 and Figure 4 is a partial configuration of the electric parking brake apparatus according to a preferred embodiment of the present invention shown in FIG. A side view showing each excerpt.

As shown in FIG. 2, the electric parking brake apparatus according to the preferred embodiment of the present invention is connected to the brakes 21 and 22 that apply braking force to the wheels 11 and 12 of the vehicle (see FIG. 1). The first and second parking cables 41 and 42, the motor 110 generating a driving force for operating the first and second parking cables 41 and 42, and a rotating shaft of the motor 110 ( The planetary gear unit 130 connected to the power transmission to the 111, the screw-nut unit 140 is coupled to the planetary gear unit 130 to operate, and a control device for controlling the driving of the motor 110 ( 160).

Since the brakes 21 and 22 and the first and second parking cables 41 and 42 for operating the same are the same in structure and operation as in the related art, detailed description thereof will be omitted.

The motor 110 is driven by receiving power from the outside, and has a rotating shaft 111 in the form of a hollow shaft. One end of the rotary shaft 111 is provided with an emergency release unit 120 which will be described later.

The planetary gear unit 130 includes a sun gear 131 integrally coupled to an outer circumference of the rotation shaft 111, a plurality of planetary gears 132 pivoting along the circumference of the sun gear 131, and a planetary gear 132. And an internal gear 134 disposed along a turning path of the vehicle, an output carrier 135 connected to the planetary gears 132 so as to transmit power, and a gear housing 136 in which these components are accommodated. .

As shown in FIG. 3, the plurality of planetary gears 132 are installed at equal intervals so as to be connected to the internal gear 134 fixed to the inner side of the sun gear 131 and the gear housing 136 at the same time. The planetary gear 132 is not limited to three as shown in the figure, but may be installed in two, four, or another number. Connection members 133 are installed at the centers of the planetary gears 132, and the planetary gears 132 and the output carrier 135 are coupled to each other through these connection members 133. Slip is generated at a connection portion of at least one of the connection portion between each connection member 133 and the planetary gear 132 and the connection portion between each connection member 133 and the output carrier 135.

The output carrier 135 rotates at the same rotational speed as the planetary gears 132 turning around the sun gear 131. In addition, the output carrier 135 rotates with the same rotation center line as the rotation center line of the sun gear 131. As shown in FIG. 3, a hexagonal center hole 135a is formed in the center of the output carrier 135. The center hole 135a is a portion corresponding to the power connection portion 143 of the screw-nut unit 140, which will be described later, and the power connection portion 143 such as a square shape or a triangular shape other than the hexagon shape is slid in the axial direction. It may be movable, but may be made of various non-circular shapes that can be prevented from sliding in the circumferential direction.

As shown in FIG. 3, when the sun gear 131 rotates counterclockwise, each of the planetary gears 132 rotates counterclockwise around the sun gear 131 while rotating clockwise, thereby outputting the result. The carrier 135 rotates counterclockwise at a reduced rotational speed equal to the rotational speed of the planetary gears 132.

As shown in FIG. 2, the screw-nut unit 140 includes a screw member 141 coupled to the output carrier 135, and first and second nut members screwed to respective ends of the screw member 141. 146, 148.

The screw member 141, a slip part 142 rotatably inserted into the rotating shaft 111, and a power connection part 143 coupled to one end of the slip part 142 and inserted into a rotation center of the output carrier 135. And a first bolt portion 144 coupled to one end of the power connection portion 143 and having a plurality of male threads 144a having a predetermined spiral direction, and coupled to the other end of the slip portion 142 and having a first bolt portion ( The second bolt portion 145 is formed of a plurality of male threads 145a having a spiral direction opposite to the male threads 144a of 144. As shown in FIG. 3, the power connection part 143 has a hexagonal shape whose cross section corresponds to the center hole 135a of the output carrier 135, and the center hole 135a to allow sliding in the axial direction. Is inserted into Similar to the center hole 135a of the output carrier 135, the cross-sectional shape of the power connection unit 143 may not slip in the circumferential direction while being inserted into the center hole 135a such as a square shape, a pentagon shape, etc. in addition to the hexagonal shape. It can be made in a variety of non-circular shapes.

The first nut member 146 has a plurality of female threads 147a having the same spiral direction as the spiral direction of the male thread 144a of the first bolt portion 144 so that the first bolt portion 144 may be screwed. A nut part 147 is formed. The first parking cable 41 is connected to the end of the first nut member 146.

Similarly, the second nut member 148 has a plurality of arms having the same spiral direction as the spiral direction of the male thread 145a of the second bolt portion 145 so that the second bolt portion 145 can be screwed together. The nut part 149 which consists of nanasan 149a is provided. A second parking cable 42 is connected to an end of the second nut member 148, and a load sensor 150 is installed between the second nut member 148 and the second parking cable 42.

When the screw member 141 together with the output carrier 135 rotates in one direction, for example, the forward direction, the first bolt part 144 is inserted into the nut part 147 of the first nut member 146 by the screw movement. The first and second parking cables 41 and 42 are drawn toward the motor 110 while the second bolt 145 is inserted into the nut 149 of the second nut member 148. On the contrary, when the screw member 141 rotates in the other direction, for example, in the reverse direction, the first bolt part 144 is pulled out of the nut part 147 of the first nut member 146 and the second bolt part 145 is made into the first bolt part 145. 2 The force applied to the first and second parking cables 41 and 42 while removing from the nut part 149 of the nut member 148 is removed.

The load sensor 150 installed between the second nut member 148 and the second parking cable 42 has a force applied to each of the parking cables 41 and 42 by the action of the screw-nut unit 140. The magnitude is detected and the signal is sent to the control device 160. The installation position of the load sensor 150 may be between the first nut member 146 and the first parking cable 41.

In addition, the emergency release unit 120 coupled to one side of the rotation shaft 111 of the motor 110 may apply a force to the first and second parking cables 41 and 42 in a sudden situation such as a failure or interruption of power supply. As shown in FIG. 4, the worm wheel 121 is integrally coupled to the outer circumference of the rotating shaft 111 and the worm 122 is geared to the worm wheel 121. An end portion of the worm 122 is provided with a manual operation unit 123 for manually operating the worm 122. When the driver rotates the worm 122 by combining a tool such as a spanner or a wrench to the manual operation unit 123, the worm wheel 121 and the worm wheel 121 connected to the gear and the rotating shaft 111 integrally coupled with the worm wheel 121. By this rotation, the screw-nut unit 140 is manually operated.

The controller 160 controls various operations of the motor 110, such as driving and stopping, forward rotation, and reverse rotation, of the motor 110 through an input signal transmitted from the driver command and the load sensor 150. When the brake operation command or the brake release command is applied by the driver, the control unit 160 rotates the motor 110 in the forward or reverse direction. In addition, the controller 160 receives the signal output from the load sensor 150 and stops the motor 110 when the force applied to the first and second parking cables 41 and 42 becomes greater than a predetermined size. .

The operation of the electric parking brake apparatus according to the preferred embodiment of the present invention having such a configuration is as follows.

First, when a brake operation command is applied through the control device 160, the motor 110 rotates in a predetermined direction, for example, a forward direction. When the rotation shaft 111 rotates, the output gear 135 rotates at a reduced speed such as the rotation speed of the planet gears 132 while the sun gear 131 and the plurality of planetary gears 132 rotate. At the same time, the first bolt part 144 is inserted into the nut part 147 of the first nut member 146 by the screw movement while the screw member 141 rotates, and the second bolt part 145 is inserted. It is inserted into the nut part 149 of the second nut member 148. As a result, the first and second parking cables 41 and 42 are pulled toward the motor 110, and each brake 21 is operated by the operation of the first and second parking cables 41 and 42. 22, see FIG. 1, applies a braking force to the wheels 11, 12; see FIG. When the first and second parking cables 41 and 42 continue to be pulled and the force applied to them is greater than or equal to a certain magnitude, the control device 160 that has received a signal for this from the load sensor 150 is connected to the motor 110. Time).

When the force applied to each of the first parking cable 41 and the second parking cable 42 is different, the power connecting portion 143 and the slip portion 142 of the screw member 141 are centered on the output carrier 135. Each slides in the ball 135a and the rotating shaft 111, and moves toward a parking cable that receives more force. As a result, the first and second parking cables 41 and 42 are subjected to the same force.

On the contrary, when the driver's brake release command is applied through the control device 160, the rotation shaft 111 of the motor 110 rotates in a predetermined direction, for example, in a reverse direction. The driving force of the rotary shaft 111 is transmitted to the screw member 141 through the sun gear 131, the plurality of planetary gears 132 and the output carrier 135, and the screw member 141 rotates in the opposite direction as when the brake is operated. While the first bolt portion 144 and the second bolt portion 145 is released from each nut portion 147, 149 of the first and second nut members 146, 148. Therefore, the force applied to the first and second parking cables 41 and 42 is removed, and each parking cable 41 and 42 is removed by the elastic force of the restoring spring provided in each brake 21 and 22. The braking force of the brakes 21 and 22 applied to the respective wheels 11 and 12 (see FIG. 1) while being pulled toward the brakes 21 and 22 (see FIG. 1) is removed.

In the electric parking brake apparatus according to the preferred embodiment of the present invention, by using the planetary gear unit, the operation of the electric parking brake apparatus is made smoothly and noise is reduced.

On the other hand, although not shown, the specific configuration of the screw member and the nut member may vary somewhat. In detail, the nut part other than the bolt part may be installed at the end of the power connection part 143 inserted into the output carrier 135, and the nut part other than the bolt part may also be installed at the end of the slip part 142 inserted into the rotation shaft 111. have. In addition, a pair of screw members to which the first and second parking cables 41 and 42 are respectively connected may be screwed to each nut part.

In this case, the nut member is rotated by the rotation of the output carrier, but since the mutual linear motion due to the screw movement between the nut member and the screw member is not different, the operation of the first and second parking cables 41 and 42 is performed. Is the same as in the above preferred embodiment.

The electric parking brake apparatus according to the present invention described above uses a planetary gear unit having a low frictional loss and high power transmission efficiency due to a distributed transmission load, thereby smoothly operating and reducing noise.

The present invention has been described above with reference to some embodiments, but the present invention is not limited to the configuration and operation as illustrated and described as such embodiments. That is, the present invention is capable of various changes and modifications within the spirit and scope of the appended claims.

Claims (5)

An electric motor including a parking cable (41) 42 connected to a brake that applies a braking force to a wheel of a vehicle and generating a driving force for operating the parking cable (41) 42. In the parking brake system, A hollow shaft rotating shaft 111 installed through the center of the motor 110; A sun gear 131 integrally coupled to the outer side of the rotation shaft 111, a plurality of planetary gears 132 geared to the sun gear 131 so as to pivot along the circumference of the sun gear 131, and the planetary gear The internal gear 134 disposed along the turning path of the planetary gears 132 to be connected to the gears 132, and the planetary gears 132 of the planetary gears 132 to transmit power to the planetary gears 132. A planetary gear unit 130 coupled to a connection member 133 installed at each center and having an output carrier 135 rotating with the same rotation center line as the rotation center line of the sun gear 131; A screw having a screw member 141 which is connected to the output carrier 135 so as to transmit power through the rotating shaft 111 and the nut member which is screwed to allow a linear movement with the screw member 141 A nut unit 140; The screw member 141, Slip portion 142 is rotatably inserted into the rotary shaft 111: A power connection part 143 coupled to one end of the slip part 142 and inserted into a rotation center of the output carrier 135: A first bolt portion 144 coupled to one end of the power connection portion 143 and composed of a plurality of male threads 144a having a predetermined spiral direction; and A second bolt portion 145 coupled to the other end of the slip portion 142 and composed of a plurality of male thread threads 145a having a direction opposite to the spiral direction of the male thread threads 144a of the first bolt portion 144: And The nut member, The first nut member 146 is screwed with the first bolt portion 144: And A second nut member 148 screwed to the second bolt portion 145; Each of the parking cables 41 and 42 is coupled to each end of the first and second nut members 146 and 148 so that the screw member 141 and the nut are rotated by the output carrier 135. Each of the parking cables 41 and 42 is operated by mutual linear movement of the members, The power connecting portion 143 of the screw member 141 has a cross section corresponding to a non-circular center hole 135a provided at the center of the output carrier 135, the slip portion 142 and The power connection unit (143) is an electric parking brake device, characterized in that the sliding movement in the axial direction with respect to the rotary shaft (111) and the output carrier (135). delete delete The method of claim 1, Further comprising an emergency release unit 120 capable of manually rotating the rotary shaft 111 of the motor 110, The emergency release unit 120, the worm wheel 121 is integrally coupled to the outer circumference of the rotary shaft 111 and the worm wheel gear 121 is characterized in that it comprises a worm 122 which can be manually operated Electric parking brake system. The method of claim 1, Force applied to each of the parking cables 41 and 42 by the screw-nut unit 140 on at least one side between the screw-nut unit 140 and each of the parking cables 41 and 42. Motorized parking brake device, characterized in that the load sensor 150 for detecting the size of the installed.

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