KR20210009244A - Parking brake apparatus for vehicle - Google Patents

Abstract

The present invention is to provide a parking brake apparatus for a vehicle in which a load can be uniformly transmitted to a brake pad due to a load transmission unit. According to the present invention, a parking brake apparatus comprises: a motor unit for generating power by receiving power from the outside; a power transmission unit which is directly connected to the motor unit and is rotated by driving the motor unit; a pair of pressing units for receiving the power from the power transmission unit to press a brake pad; and a load transmission unit installed between the pair of pressing units and connected to the pair of pressing units, respectively, and transmitting a pressing load of any one of the pair of pressing units to the other pressing unit.

Description

Vehicle parking brake system {PARKING BRAKE APPARATUS FOR VEHICLE}

The present invention relates to a parking brake device for a vehicle, and more particularly, to a parking brake device for a vehicle capable of uniformly transmitting a load to a brake pad.

In general, an actuator of an electronic parking brake of a vehicle is composed of a motor and a power transmission device for operating a friction pad installed in a caliper of a disc brake device during parking.

When the driver presses the parking brake switch, the rotational force of the motor of the actuator is transmitted to the input shaft of the caliper through a power transmission device such as a reduction device. Through the rotation of the input shaft, the pressure full-speed sleeve advances, and the piston and caliper housing accommodating it move toward each other by the advancement of the pressure connection sleeve, so that the two friction pads mounted on the piston and caliper housing are located on both sides of the disk. To restrain rotation.

When a plurality of pistons are provided and a driving force is transmitted from a single actuator, a load is unevenly transmitted to the plurality of pistons, and in this case, there is a problem that uneven wear occurs and braking performance is deteriorated.

The present invention has been conceived to improve the above problems, and an object thereof is to provide a vehicle parking brake device capable of uniformly transmitting a load to a brake pad due to a load transmission unit.

A vehicle parking brake apparatus according to the present invention includes: a motor unit receiving power from an external source to generate power; A power transmission unit directly connected to the motor unit and configured to rotate by transmitting the driving of the motor unit; A pair of pressing units receiving power from the power transmission unit and pressing the brake pads; And a load transmission unit installed between the pair of pressing units and connected to each of the pair of pressing units, and transmitting a pressing load of any one of the pair of pressing units to the other pressing unit. It is characterized by that.

In the present invention, each of the pair of pressing parts, a sun gear part which is rotated by receiving power from the power transmission part; A planetary gear engaged with the sun gear and rotated; A carrier part coupled to the planetary gear part; And a piston part connected to the carrier part and receiving rotational power from the planetary gear part and moving toward the brake pad to press the brake pad.

In the present invention, the power transmission unit, the transmission shaft is directly connected to the motor unit and the motor unit and the power transmission; And transmission worm gears disposed on both sides of the transmission shaft and transmitting rotational force of the transmission shaft to the sun gear portion.

In the present invention, the transmission worm gear is characterized in that it transmits power to the sun gear portion through a connection gear portion.

In the present invention, the connection gear unit, a connection gear body coupled to the sun gear unit; And a connection worm wheel formed on an outer circumferential surface of the connection gear body and engaged with the transmission worm gear.

In the present invention, the connection gear portion further comprises a connection insertion portion formed in the inner space of the wall in which the connection worm wheel is formed, and the ring gear portion is inserted and disposed in the connection insertion portion.

In the present invention, the rotation center of the sun gear part is concentric with the rotation center of the connection gear part.

In the present invention, the sun gear portion and the connection gear portion is characterized in that it is formed integrally.

In the present invention, the load transmission unit includes a pair of ring gear units, each of the pair of ring gear units is rotatable in engagement with the planetary gear unit, and the pair of ring gear units are directly engaged with each other. .

In the present invention, the load transmission unit, each of a pair of ring gear units rotatable in engagement with the planetary gear unit; And one or more transmission gear units disposed between a pair of the ring gear units and engaged with the ring gear units.

In the present invention, each of the pair of ring gear portions includes: a ring gear inner portion having an inner gear portion formed along an inner circumferential surface so as to engage with the planetary gear portion; And a ring gear outer portion coupled with an outer surface of the inner portion of the ring gear and having an outer gear portion formed along the outer peripheral surface to engage with the transmission gear portion.

In the present invention, the ring gear inner portion and the ring gear outer portion is formed integrally.

In the present invention, the inner portion of the ring gear protrudes further toward the sun gear portion than the outer portion of the ring gear, and the inner portion of the ring gear surrounds the sun gear portion and the planetary gear portion.

In the present invention, the carrier part is characterized in that the spline is coupled to the piston part.

In the present invention, the piston part receives rotational power from the carrier part, and linearly reciprocates toward the brake pad according to the rotation direction of the carrier part.

In the vehicle parking brake apparatus according to the present invention, when a pressure load is biased to any one of a plurality of pressurization units due to the load transmission unit, it is transmitted to the remaining pressurization unit so that the pressurization unit pressurizes the brake pad with a uniform load. .

1 is a perspective view showing a vehicle parking brake device according to an embodiment of the present invention.
2 is a partial perspective view showing a parking brake device for a vehicle according to an embodiment of the present invention.
3 is a partial exploded view showing a vehicle parking brake apparatus according to an embodiment of the present invention.
4 is a front view showing a vehicle parking brake device according to an embodiment of the present invention.
5 to 7 are state diagrams showing a driving state of the vehicle parking brake apparatus according to an embodiment of the present invention.

Hereinafter, an embodiment of a vehicle parking brake apparatus according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

1 is a perspective view showing a vehicle parking brake apparatus according to an embodiment of the present invention. 2 is a partial perspective view showing a parking brake device for a vehicle according to an embodiment of the present invention. 3 is a partial exploded view showing a parking brake device for a vehicle according to an embodiment of the present invention. 4 is a front view showing a vehicle parking brake apparatus according to an embodiment of the present invention. 5 to 7 are state diagrams showing a driving state of the vehicle parking brake apparatus according to an embodiment of the present invention.

1 to 5, a vehicle parking brake device 1 according to an embodiment of the present invention includes a driving unit 50, a pressing unit 100 and 200, and a load transmission unit 300.

The driving unit 50 includes a motor unit 60 that receives power from the outside and generates power. The motor unit 60 includes a motor body 61 from which power is generated, and a drive shaft 62 that is rotated by the motor body 61.

The drive unit 50 further includes a power transmission unit 70. That is, the motor unit 60 of the driving unit 50 may indirectly transmit the power generated through the power transmission unit 70 to the pressing units 100 and 200.

The power transmission unit 70 includes a transmission shaft 71 and a transmission worm gear 72.

The transmission shaft 71 is directly coupled to the drive shaft 62. Therefore, the rotation of the drive shaft 62 is directly transmitted to the transmission shaft 71.

Transmission worm gears 72 are disposed on both sides of the power transmission unit 70, respectively. Therefore, when the transmission shaft 71 is rotated by the rotation of the driving shaft 62, the transmission worm gears 72 at both ends connected to the transmission shaft 71 are interlocked and rotated.

The transmission worm gear 72 may be integrally formed on the transmission shaft 71, and may be formed separately from the transmission shaft 71 and integrated by coupling.

As described above, according to the present embodiment, even if one transmission shaft 71 is rotated using one motor unit 60, two transmission worm gears 72 connected to the transmission shaft 71 can be simultaneously rotated. , It is possible to provide power to the pair of pressing units (100, 200) at the same time.

That is, as the power transmission unit 70 has a structure including one transmission shaft 71 and a pair of transmission worm gears 72 connected to the transmission shaft 71, a pair of pressing units 100 , 200) It is possible to simultaneously transmit the same force to each.

Since the transmission shaft 71 is directly connected to the motor unit 60, the power provided from the motor unit 60 is transmitted to the transmission shaft 71 as it is. Accordingly, it is possible to transmit the power generated by the motor unit 60 to the power transmission unit 70 without loss.

In addition, as the motor unit 60 and the transmission shaft 71 are directly connected to each other, the size of the brake device can be reduced and power efficiency can be improved.

1 to 3, the vehicle parking brake device 1 according to the present embodiment includes a mounting case 500 and a mounting cover 510.

The mounting case 500 includes a driving unit 50, a pressing unit 100, 200, and a load transmission unit 300. The mounting cover 510 is detachably coupled to the mounting case 500 and blocks the entry of foreign substances into the mounting case 500 by closing an opening on one side of the mounting case 500.

The pressing parts 100 and 200 according to an embodiment of the present invention are installed inside the caliper housing 10 and receive power from the driving unit 50 to generate contact friction with a disk (not shown). Press (20).

A plurality of pressing parts 100 and 200 are provided, and a plurality of pressing parts 100 and 200 are arranged side by side. The pressing parts 100 and 200 are installed symmetrically to the left and right (based on FIG. 4) with respect to the central part of the brake pad 20.

The pressing units 100 and 200 receive power from the driving unit 50 and press the brake pad 20 with the same pressing load. The brake pad 20 is moved toward the disk by this pressing force, and a braking force is generated due to friction between the brake pad 20 and the disk.

The pressurization parts 100 and 200 according to an embodiment of the present invention include sun gear parts 110 and 210, connection gear parts 120 and 220, planetary gear parts 130 and 230, carrier parts 150 and 250, and piston parts. (170, 270).

Meanwhile, in FIGS. 4 to 7, the connecting gear bodies 121 and 221 of the connecting gear units 120 and 220 are omitted for convenience of description.

The connection gear units 120 and 220 include connection gear bodies 121 and 221, connection worm wheels 122 and 222, and connection inserts 123 and 223.

The connection gear units 120 and 220 are provided with connection worm wheels 122 and 222 on their outer circumferential surfaces so as to engage with the respective transmission worm gear 72 of the driving unit 50, specifically, the power transmission unit 70.

As a result, the power generated from the motor unit 60 is transmitted to the connection worm wheels 122 and 222 through the power transmission unit 70. That is, the power of the driving unit 50 is transmitted to the connecting gear units 120 and 220 to rotate the connecting gear units 120 and 220. The connection worm wheels 122 and 222 are formed in a worm wheel shape.

The connection inserts 123 and 223 are formed in the inner space of the connection worm wheels 122 and 222. That is, the connection worm wheel (122, 222) is formed on the outside of the wall formed along the outer circumferential surface of the connection gear body (121, 221), the connection inserts (123, 223) is the connection worm wheel (122, 222) is formed. It is formed in the inner space of the wall.

A ring gear part 310, specifically, a ring gear inner part 311 is inserted into the connection inserting parts 123 and 223. The connection insertion portions 123 and 223 are formed in a concave groove shape.

The sun gear units 110 and 210 are rotated by receiving power from the driving unit 50. According to the present embodiment, the sun gear units 110 and 210 are coupled to the connection gear units 120 and 220, and the sun gear units 110 and 210 are connected to the driving unit 50 and are energetically connected to the connecting gear units 120 and 220. ) Can be rotated.

The sun gear units 110 and 210 include sun gears 111 and 211 and sun gear connection bodies 112 and 212.

The sun gear connection bodies 112 and 212 are coupled to the connection gear bodies 121 and 221. The sun gears 111 and 211 are formed in the center of the sun gear connection bodies 112 and 212, and are formed in a gear shape on the outer circumferential surface so as to mesh with the planetary gears 130 and 230.

The sun gear parts 110 and 210 are concentric with the rotation center of the connection gear parts 120 and 220. Therefore, when power is transmitted to the connection gear units 120 and 220 by the power transmission unit 70, the connection gear units 120 and 220 and the sun gear units 110 and 210 rotate on the same rotation axis.

The sun gear units 110 and 210 are disposed inside the inner circumferential surfaces of the connection gear units 120 and 220 in which the connection inserts 123 and 223 are formed.

The sun gear units 110 and 210 may be integrally formed with the connection gear units 120 and 220. Alternatively, the sun gear units 110 and 210 are formed as separate objects from the connection gear units 120 and 220, and may be integrated by combining them.

When the sun gear units 110 and 210 are integrally formed with or are integrated with the connection gear units 120 and 220, when the connecting gear units 120 and 220 driven by receiving power from the power transmission unit 70 rotate, the sun gear unit ( 110, 210) are also rotated together.

The sun gears 111 and 211 are disposed inside the planetary gears 130 and 230 provided with a plurality of them. The planetary gear units 130 and 230 rotate and rotate while being engaged with the sun gears 111 and 211.

The planetary gear units 130 and 230 are provided with a plurality of planetary gears 131 and 231. In the present embodiment, the number of planetary gears 131 and 231 is exemplified as four, but the number of planetary gears 131 and 231 is not limited thereto.

The plurality of planetary gears 131 and 231 are arranged at an equal angle with respect to the rotation center of the sun gears 111 and 211. The plurality of planetary gears 131 and 231 rotate and/or revolve when the sun gears 111 and 211 rotate while being engaged with the sun gears 111 and 211.

The planetary gear units 130 and 230 are coupled to the carrier units 150 and 250. When the plurality of planetary gears 131 and 231 revolve around the sun gears 111 and 211, the carrier units 150 and 250 are also rotated in a clockwise or counterclockwise direction (see FIG. 4).

As the carrier parts 150 and 250 rotate, the piston parts 170 and 270 move toward the brake pad 20 and press the brake pad 20.

The carrier parts 150 and 250 include carrier bodies 151 and 251, carrier rotation shafts 152 and 252, and carrier connection parts 153 and 253.

The carrier rotation shafts 152 and 252 are formed to protrude from the carrier bodies 151 and 251 toward the planetary gears 130 and 230.

A plurality of carrier rotation shafts 152 and 252 are provided equal to the number of planetary gear units 130 and 230 and are coupled through the planetary gear units 130 and 230. Accordingly, the planetary gear units 130 and 230 are rotated on the carrier rotation shafts 152 and 252 and can rotate.

The carrier connection parts 153 and 253 are formed on the inner circumferential surfaces of the carrier bodies 151 and 251 and are connected to the piston connection parts 173 and 273 of the piston parts 170 and 270.

In this embodiment, the carrier connection portions 153 and 253 have a concave groove shape, and the piston connection portions 173 and 273 have a protrusion shape inserted into the carrier connection portions 153 and 253.

On the contrary, the piston connecting portions 173 and 273 may have a concave groove shape, and the carrier connecting portions 153 and 253 may have a protruding protrusion shape inserted into the piston connecting portions 173 and 273.

The carrier connection parts 153 and 253 and the piston connection parts 173 and 273 may be spline-coupled to each other. Of course, the carrier units 150 and 250 and the piston units 170 and 270 may be coupled in a manner other than spline coupling, for example, screw coupling.

The piston parts 170 and 270 are connected to the carrier parts 150 and 250. The piston parts 170 and 270 are rotated together as the carrier parts 150 and 250 are rotated.

The piston parts 170 and 270 include piston bodies 171 and 271, piston shafts 172 and 272, and piston connection parts 173 and 273.

The piston bodies 171 and 271 have a hollow interior and are disposed to be in contact with the brake pad 20 by movement. The piston bodies 171 and 271 may be formed in a cylindrical shape.

The piston bodies 171 and 271 are coupled with the piston shafts 172 and 272, and piston connecting portions 173 and 273 are formed at the ends of the piston shafts 172 and 272, that is, the ends facing the carrier parts 150 and 250. do.

When the carrier parts 150 and 250 rotate, the piston connecting parts 173 and 273 that are spline-coupled with the carrier connecting parts 153 and 253 are rotated, so that the rotational motion of the carrier parts 150 and 250 is performed by the piston parts 170 and 270. Is converted into linear motion.

Due to the linear movement of the piston parts 170 and 270, the piston parts 170 and 270 are moved toward the brake pad 20. Therefore, when the piston parts 170 and 270 contact the brake pad 20 and press the brake pad 20, braking force is generated due to friction between the brake pad 20 and the disk.

The load transmission unit 300 is connected to the pair of pressing units 100 and 200, respectively, and transmits a pressurized load of any one of the pressing units 100 and 200 to the other pressing unit 100 and 200.

The load transmission unit 300 according to an embodiment of the present invention includes a pair of ring gear units 310. The load transmission unit 300 may further include one or more transmission gear units 320.

Each of the pair of ring gear units 310 is rotatable in engagement with the planetary gear units 130 and 230.

The pair of ring gear units 310 may be directly engaged with each other. That is, the pair of ring gear units 310 may be directly connected to each other without disposing the transmission gear unit 320 in the middle.

In this case, since the distance between the pair of ring gear units 310 shown in FIG. 4, in other words, the distance between the connection gear units 120 and 220 on one side and the other side is reduced, it fits with the connection gear units 120 and 220 The distance between the biting one side and the transmission worm gear 72 of the other side is further reduced.

In addition, the pair of ring gear units 310 may be indirectly engaged through one or more transmission gear units 320. That is, the transmission gear unit 320 may be disposed between the pair of ring gear units 310 to be engaged with the ring gear unit 310.

3 to 7, each of the ring gear units 310 may be installed between the planetary gears 131 and 231 and the connection worm wheels 122 and 222.

Each of the ring gear units 310 includes an inner ring gear 311 and an outer ring gear 315.

The ring gear inner part 311 may be disposed outside the planetary gear parts 130 and 230, and an inner gear part 312 may be formed along the inner circumferential surface so as to engage with the planetary gear parts 130 and 230.

The inner gear part 312 of the ring gear inner part 311 installed on one side (left as referenced in FIG. 5) is rotated in a clockwise or counterclockwise direction (based on FIG. 5) while being engaged with the planetary gear part 130, and the transmission gear part ( Through 320, the power is transmitted to the ring gear unit 310 disposed on the other side (right side of FIG. 5), specifically, the ring gear outer side 315.

The ring gear outer portion 315 is coupled to the outer surface of the ring gear inner portion 311, and an outer gear portion 316 is formed along the outer peripheral surface so as to engage with the transmission gear portion 320. The ring gear outer portion 315 may be integrally formed with the ring gear inner portion 311.

As the inner gear portion 312 of the ring gear inner portion 311 installed on one side (left as referenced in FIG. 5) rotates while being engaged with the planetary gear portion 130, the ring gear outer portion 315 formed integrally with the ring gear inner portion 311 ) Is also rotated in the same direction.

Accordingly, the rotational force of the ring gear outer portion 315 of one side is transmitted to the ring gear portion 310 disposed on the other side (right side of FIG. 5) through the transmission gear portion 320, specifically, the ring gear outer portion 315.

The transmission gear unit 320 rotates in engagement with the ring gear unit 310, specifically the outer gear unit 316 formed on the ring gear outer side 315, and transmits the rotational power of the ring gear unit 310 disposed on one side to the other side. It is transmitted to the arranged ring gear 310.

The rotational power transmitted to the ring gear part 310 of the other side is transmitted to the carrier part 250 coupled to the planetary gear 231 through the ring gear inner part 311 and the planetary gear 231. As the planetary gear 231 rotates and revolves along the outer circumferential surface of the sun gear 211, the piston part 270 moves toward the brake pad 20 as the carrier part 250 coupled with the planetary gear 231 rotates.

When the pressurizing load for pressing the brake pad 20 is not uniformly applied to the pair of pressurizing units 100 and 200, specifically the pair of piston units 170 and 270 due to the load transfer unit 300 , By transferring the pressing load of the piston part 170 on one side to the piston part 270 on the other side, the pair of piston parts 170 and 270 may contact the brake pad 20 with a uniform pressing load.

Of course, contrary to this, the pressurized load of the piston part 270 on the other side can be transmitted to the piston part 270 on the one side.

4 to 7, in the present invention, the transmission gear part 320 is formed in the shape of a spur gear, and is engaged with the outer gear part 316 formed along the outer circumferential surface of the ring gear outer part 315. Rotated.

However, in addition to the spur gear shape, the transmission gear unit 320 has various shapes such as a bevel gear shape, a helical gear shape in which the gear teeth are formed to be inclined at a predetermined angle with the rotation center axis of the transmission gear unit 320 Can be replaced with

In addition, although the transmission gear unit 320 has been illustrated as having a gear shape, it is not limited thereto, and is connected to the pair of ring gear units 310 in a belt shape, and the power of one pressing unit 100 is applied to the other pressing unit 200 ), it is possible to perform various modifications.

A plurality of load transmission units 300 may be provided. Accordingly, it is not limited to two as in the present embodiment, and various modifications such as one or three or more may be provided depending on the distance between the pair of pressing portions 100 and 200 are possible.

The operation principle of the vehicle parking brake device 1 configured as described above will be described.

In the present invention, in the vehicle parking brake device 1, a plurality of pressing units 100 and 200 press the brake pad 20 so that the brake pad 20 moves toward the disk, and between the brake pad 20 and the disk. Braking force is generated due to contact friction.

In the present invention, two pressing parts 100 and 200 are provided, but the present invention is not limited thereto, and various modifications such as three or more are possible.

The pressing units 100 and 200 receive power from the driving unit 50 and are linearly reciprocated toward the brake pad 20.

Specifically, when power is supplied from the outside to generate power in the motor unit 60, the power transmission unit 70 connected to the motor unit 60 is rotated by receiving power from the motor unit 60. The power transmission unit 70 simultaneously transmits rotational power to the pair of pressing units 100 and 200.

The driving of the motor unit 60 is transmitted to a transmission shaft 71 directly connected to the motor unit 60. When each of the transmission worm gear 72 connected to the transmission shaft 71 is rotated by the rotation of the transmission shaft 71, the connection gear portions 120 and 220 engaged with the transmission worm gear 72 are rotated.

The sun gear units 110 and 210 are also rotated in conjunction with the rotation of the connection gear units 120 and 220, and the planetary gears 131 and 231 meshed with the sun gears 111 and 211 perform rotational motion and the sun gear 111 , 211).

As the planetary gears 131 and 231 move orbit, the carrier units 150 and 250 coupled to the planetary gears 131 and 231 are rotated clockwise or counterclockwise. As the carrier units 150 and 250 rotate, the piston units 170 and 270 coupled with the carrier units 150 and 250 are moved toward the brake pad 20 and pressurize the brake pad 20 in contact.

Due to various factors, more power provided from the driving unit 50 may be transmitted to any one of the pair of pressing units 100 and 200.

As shown in FIG. 6, when the vehicle parking brake device 1 is driven, more power than the pressing part 200 disposed on the other side (the right as in FIG. 6) to the pressing part 100 disposed on one side (left as shown in FIG. 6) In the case of transmission, the piston part 170 on one side may contact the brake pad 20 before the piston part 270 on the other side.

If the piston part 170 on one side has already contacted the brake pad 20 and the piston part 270 on the other side has not yet contacted the brake pad 20, the planetary machine of the pressing part 100 on one side Fisherman 130 only rotates. That is, the planetary gear unit 130 does not perform orbit.

Since the power generated by the operation of the drive unit 50 is continuously transmitted to the sun gear 111, the sun gear 111 is continuously rotated. At this time, since the piston part 170 is already in contact with the brake pad 20, the plurality of planetary gears 131 meshed with the sun gear 111 do not rotate but only rotate.

Since the pressurization unit 100 disposed on the left side of FIG. 6, specifically the piston unit 170 can no longer move toward the brake pad 20, the planetary gear 131 performs only rotational motion and the planetary gear ( The ring gear inner portion 311 in which the inner gear portion 312 is formed to engage with 131 is rotated clockwise or counterclockwise.

The reaction force generated from the pressurizing part 100 on one side (left as per FIG. 6) through the ring gear outer part 315 integrally coupled with the ring gear inner part 311 is transmitted through the transmission gear part 320 to the other side (as in FIG. 6). It is transmitted to the pressing part 200 of the right side).

Specifically, pressurization of one side through the outer gear part 316 of the other side, the inner gear part 312 of the ring gear inner part 311, the planetary gear part 230, and the carrier part 250 coupled with the planetary gear part 230 The power provided to the unit 100 is transmitted to the piston unit 270 on the other side.

As a result, the power provided from the drive unit 50 is provided to the piston unit 270 on the other side that has not yet contacted the brake pad 20, so that the brake is already applied until the piston unit 270 on the other side contacts the brake pad 20. The linear movement of the piston unit 170 on one side of the pad 20 is stopped.

Thereafter, when both the piston parts 170 and 270 of one side and the other side contact the brake pad 20, the power of the driving part 50 is provided to the piston parts 170 and 270 of one side and the other side, respectively, and the piston of one side and the other side The brake pads 20 are simultaneously pressed by the parts 170 and 270 with a uniform load.

4 to 7, when the pressurizing load is biased to the pressurizing unit 100 on one side of the pair of pressurizing units 100 and 200 due to the load transmission unit 300 according to an embodiment of the present invention , By transferring this to the pressurizing unit 200 of the other side, the pair of pressurizing units 100 and 200 can press the brake pad 20 toward the disc with a uniform press load.

Likewise, when the pressurizing load is more biased to the pressurizing unit 200 of the other side of the pair of pressurizing units 100 and 200, it is transmitted to the pressurizing unit 100 of one side and a pair of pressurizing units 100 and 200 The brake pad 20 can be pressed toward the disk with a uniform pressure load.

3, the ring gear inner part 311 protrudes more toward the sun gear parts 110 and 210 (left as referenced in FIG. 3) than the ring gear outer part 315, and the ring gear inner part 311 is a connection gear part 120 It may be inserted into the connection insertion portions 123 and 223 of the, 220).

Accordingly, it is possible to prevent the ring gear unit 310 from being separated from the connection gear units 120 and 220 or the sun gear units 110 and 220 when receiving rotational power from the driving unit 50.

The carrier parts 150 and 250 are spline-coupled to the piston parts 170 and 270, and thereby the rotational power of the carrier parts 150 and 250 is applied to the piston parts 170 and 270, specifically the piston connection parts 173 and 273. Can be passed on.

The piston connections 173 and 273 are coupled with the piston shafts 172 and 272 coupled to the piston bodies 171 and 271, and the piston bodies 171 and 271 with rotational power transmitted through the carrier units 150 and 250 Makes it possible to move linearly toward the brake pad 20

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only illustrative, and those of ordinary skill in the field to which the technology pertains, various modifications and other equivalent embodiments are possible. I will understand. Therefore, the technical protection scope of the present invention should be determined by the following claims.

1: parking brake device for vehicle 10: caliper housing unit
20: brake pad 50: drive unit
60: motor unit 70: power transmission unit
100, 200: pressurization part
110, 210: sun gear
120, 220: connection gear
130, 230: planetary gear
150, 250: carrier part
170, 270: piston part
300: load transmission unit
310: ring gear part
320: transmission gear part

Claims (15)

A motor unit receiving power from the outside to generate power;
A power transmission unit directly connected to the motor unit and configured to rotate by transmitting the driving of the motor unit;
A pair of pressing units receiving power from the power transmission unit and pressing the brake pads; And
Including; a load transmission unit installed between the pair of pressing units, each connected to the pair of pressing units, and transmitting a pressing load of any one of the pair of pressing units to the other pressing unit. Vehicle parking brake device, characterized in that.
The method of claim 1,
Each of the pair of pressing parts,
A sun gear unit rotated by receiving power from the power transmission unit;
A planetary gear engaged with the sun gear and rotated;
A carrier part coupled to the planetary gear part; And
And a piston unit connected to the carrier unit and receiving rotational power from the planetary gear unit and moving toward the brake pad to press the brake pad.
The method of claim 2,
The power transmission unit,
A transmission shaft directly connected to the motor unit and energetically connected to the motor unit; And
And a transmission worm gear disposed on both sides of the transmission shaft and transmitting rotational force of the transmission shaft to the sun gear unit.
The method of claim 3,
The transmission worm gear is a vehicle parking brake device, characterized in that transmitting the power to the sun gear portion through a connection gear portion.
The method of claim 4,
The connecting gear part,
A connection gear body coupled to the sun gear unit; And
And a connection worm wheel formed on an outer circumferential surface of the connection gear body and meshing with the transmission worm gear.
The method of claim 5,
The connection gear part further comprises a connection insertion part formed in the inner space part of the wall where the connection worm wheel is formed,
The vehicle parking brake device, characterized in that the ring gear portion is inserted and disposed in the connection insertion portion.
The method of claim 6,
The vehicle parking brake device, characterized in that the rotation center of the sun gear part is concentric with the rotation center of the connection gear part.
The method of claim 7,
The vehicle parking brake device, characterized in that the sun gear portion and the connection gear portion are integrally formed.
The method of claim 2,
The load transmission unit includes a pair of ring gear units,
Each of the pair of ring gear portions is rotatable in engagement with the planetary gear portion,
A vehicle parking brake device, characterized in that the pair of the ring gear units directly engage with each other.
The method of claim 2,
The load transmission unit,
A pair of ring gear units, each rotatable in engagement with the planetary gear unit; And
And one or more transmission gear units disposed between a pair of the ring gear units and engaged with the ring gear units.
The method of claim 10,
Each of the pair of ring gear parts,
A ring gear inner portion having an inner gear portion formed along an inner circumferential surface to engage the planetary gear portion; And
And a ring gear outer portion coupled with an outer surface of the ring gear inner portion and having an outer gear portion formed along the outer circumferential surface so as to engage with the transmission gear portion.
The method of claim 11,
The vehicle parking brake device, characterized in that the ring gear inner portion and the ring gear outer portion are integrally formed.
The method of claim 11,
The inner portion of the ring gear protrudes further toward the sun gear portion than the outer portion of the ring gear, and the inner portion of the ring gear surrounds the sun gear portion and the planetary gear portion.
The method of claim 2,
The vehicle parking brake device, characterized in that the carrier part is spline-coupled to the piston part.
The method of claim 14,
The piston unit receives rotational power from the carrier unit, and linearly reciprocates toward the brake pad according to a rotation direction of the carrier unit.

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