KR102644870B1 - Parking brake apparatus for vehicle - Google Patents

Abstract

The parking brake device for a vehicle according to the present invention includes a motor unit that receives power from the outside and generates power, a power transmission unit that is directly connected to the motor unit and rotates by transmitting the drive of the motor unit, and a power transmission unit that transmits power from the power transmission unit. A pair of pressurizing units that receives the pressure and pressurizes the brake pads are installed between the pair of pressurizing units and are respectively connected to the pair of pressurizing units, and transfer the pressurizing load from one of the pair of pressurizing units to the other pressurizing unit. It is characterized by including a load transfer part that transmits the load.

Description

Parking brake device for vehicle {PARKING BRAKE APPARATUS FOR VEHICLE}

The present invention relates to a parking brake device for a vehicle, and more specifically, to a parking brake device for a vehicle that can transmit a load uniformly to brake pads.

In general, the actuator of an automobile's electronic parking brake consists of a motor and a power transmission device to operate the friction pad installed on the caliper of the disc brake device when parking.

When the driver presses the parking brake switch, the rotational force of the actuator's motor 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 transfer sleeve moves forward, and the piston and caliper housing that accommodate it move toward each other due to the advancement of the pressure connection sleeve, so that the two friction pads mounted on the piston and caliper housing move on both sides of the disk. Pressure to restrict rotation.

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

The present invention was developed to improve the above problems, and its purpose is to provide a parking brake device for a vehicle that can uniformly transmit a load to the brake pads due to a load transfer unit.

A parking brake device for a vehicle according to the present invention includes: a motor unit that generates power by receiving power from the outside; A power transmission unit that is directly connected to the motor unit and rotates by transmitting the drive of the motor unit; A pair of pressurizing units that receive power from the power transmission unit and pressurize the brake pads; And a load transfer unit installed between the pair of press parts, connected to each of the pair of press parts, and transferring the press load of one of the pair of press parts to the other press part. It is characterized by

In the present invention, each of the pair of pressing units includes a sun gear unit that receives power from the power transmission unit and rotates; A planetary gear unit engaged with the sun gear unit and rotated; A carrier portion coupled to the planetary gear portion; and a piston unit connected to the carrier unit, receiving rotational power from the planetary gear unit, and moving toward the brake pad to press the brake pad.

In the present invention, the power transmission unit includes a transmission shaft directly connected to the motor unit and dynamically connected to the motor unit; and a transmission worm gear disposed on both sides of the transmission shaft and transmitting the rotational force of the transmission shaft to the sun gear unit.

In the present invention, the transmission worm gear is characterized in that it transmits power to the sun gear unit through the connecting gear unit.

In the present invention, the connecting gear portion includes a connecting gear body coupled to the sun gear portion; and a connecting worm wheel formed on the outer peripheral surface of the connecting gear body and engaged with the transmission worm gear.

In the present invention, the connecting gear portion further includes a connecting insertion portion formed in an inner space of the wall where the connecting worm wheel is formed, and the ring gear portion is inserted into the connecting insertion portion.

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

In the present invention, the sun gear portion and the connecting gear portion are formed integrally.

In the present invention, the load transfer 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 characterized in that they are directly engaged with each other. .

In the present invention, the load transfer unit includes a pair of ring gear units, each of which is rotatable in engagement with the planetary gear unit; and one or more transmission gear parts disposed between the pair of ring gear parts and engaging with the ring gear parts.

In the present invention, each of the pair of ring gear parts includes: a ring gear inner part in which an inner gear part is formed along an inner peripheral surface to engage with the planetary gear part; And a ring gear outer portion coupled to the outer surface of the ring gear inner portion 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 are formed integrally.

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

In the present invention, the carrier part is splined to the piston part.

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

The parking brake device for a vehicle according to the present invention has the effect of allowing the pressurizing unit to pressurize the brake pad with a uniform load by transferring it to the remaining pressing units when the pressurizing load is concentrated on one of the plurality of pressurizing units due to the load transfer unit. .

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

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

In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

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

1 to 5, a parking brake device 1 for a vehicle according to an embodiment of the present invention includes a driving unit 50, a pressing unit 100 and 200, and a load transfer 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 that generates power, and a drive shaft 62 that is rotated by the motor body 61.

The driving unit 50 additionally includes a power transmission unit 70. That is, the motor unit 60 of the driving unit 50 can indirectly transmit 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 drive shaft 62, each of 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 formed integrally with the transmission shaft 71, or may be formed separately from the transmission shaft 71 and be integrated by coupling.

As such, according to this embodiment, even if one transmission shaft 71 is rotated using one motor unit 60, the two transmission worm gears 72 connected to the transmission shaft 71 can be rotated simultaneously. , it is possible to provide power to a pair of pressurizing units 100 and 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 becomes possible to transmit the same force to each at the same time.

Since the transmission shaft 71 is directly connected to the motor unit 60, the power provided from the motor unit 60 is directly transmitted to the transmission shaft 71. Therefore, the power generated in the motor unit 60 can be transmitted to the power transmission unit 70 without loss.

Additionally, since 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.

Referring to Figures 1 to 3, the parking brake device 1 for a vehicle according to this 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 transfer unit 300. The mounting cover 510 is detachably coupled to the mounting case 500 and closes one opening of the mounting case 500 to block foreign substances from entering the mounting case 500.

The pressurizing parts 100 and 200 according to an embodiment of the present invention are installed inside the caliper housing 10 and are brake pads that receive power from the driving part 50 and generate contact friction with the disk (not shown). Pressurize (20).

A plurality of pressing units 100 and 200 are provided, and the plurality of pressing units 100 and 200 are arranged side by side. The pressurizing parts 100 and 200 are installed symmetrically on the left and right sides (see 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 pressurize the brake pad 20 with the same pressing load. Due to this pressing force, the brake pad 20 moves toward the disc, and braking force is generated due to friction between the brake pad 20 and the disc.

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

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

The connection gear parts 120 and 220 include a connection gear body 121 and 221, a connection worm wheel 122 and 222, and a connection insertion portion 123 and 223.

The connection gear units 120 and 220 are provided with connection worm wheels 122 and 222 on their outer peripheral surfaces to engage with each transmission worm gear 72 of the drive unit 50, specifically the power transmission unit 70.

As a result, the power generated from the motor unit 60 is transmitted to the connecting 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 connecting worm wheels 122 and 222 are formed in a worm wheel shape.

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

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

The sun gear units 110 and 210 receive power from the drive unit 50 and rotate. According to this 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 through the connection gear units 120 and 220 that are dynamically connected to the drive unit 50. ) rotation becomes possible.

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

The sun gear connection bodies (112, 212) are coupled to the connection gear bodies (121, 221). The sun gears 111 and 211 are formed in the central portion of the sun gear connecting bodies 112 and 212, and are formed in a gear shape on the outer peripheral surface to engage with the planetary gear portions 130 and 230.

The sun gear units 110 and 210 are concentric with the rotation center of the connection gear units 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 portions 110 and 210 are disposed on the inside of the inner peripheral surface of the connecting gear portions 120 and 220 where the connecting insert portions 123 and 223 are formed.

The sun gear units 110 and 210 may be formed integrally with the connection gear units 120 and 220. Alternatively, the sun gear units 110 and 210 may be formed separately from the connecting gear units 120 and 220, but may be integrated by coupling.

As the sun gear units 110 and 210 are formed integrally with the connection gear units 120 and 220, or are integrated with each other, when the connection gear units 120 and 220, which are driven by receiving power from the power transmission unit 70, are rotated, the sun gear unit ( 110, 210) are also rotated.

The sun gears 111 and 211 are disposed inside a plurality of planetary gear units 130 and 230. The planetary gear units (130, 230) engage with the sun gears (111, 211) and rotate and revolve.

The planetary gear units 130 and 230 include a plurality of planetary gears 131 and 231. In this embodiment, the number of planetary gears 131 and 231 is exemplified as four, but the number is not limited to this, and the number may be three or less or five or more.

The plurality of planetary gears 131 and 231 are arranged at an equal angle based on the rotation center of the sun gears 111 and 211. The plurality of planetary gears 131 and 231 engage with the sun gears 111 and 211 and rotate and/or rotate when the sun gears 111 and 211 rotate.

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 clockwise or counterclockwise (as shown in FIG. 4).

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

The carrier portions 150 and 250 include a carrier body 151 and 251, a carrier rotation axis 152 and 252, and a carrier connection portion 153 and 253.

The carrier rotation axis (152, 252) is formed to protrude from the carrier body (151, 251) toward the planetary gear units (130, 230).

The carrier rotation shafts 152 and 252 are provided in plural numbers equal to the number of planetary gear units 130 and 230, and are coupled through the planetary gear units 130 and 230. Due to this, the planetary gear units (130, 230) can rotate and rotate on the carrier rotation axis (152, 252).

The carrier connection parts 153 and 253 are formed on the inner peripheral surface of the carrier body 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 parts 153 and 253 have a concave groove shape, and the piston connection parts 173 and 273 have the shape of a protruding protrusion inserted into the carrier connection parts 153 and 253.

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

The carrier connection portions 153 and 253 and the piston connection portions 173 and 273 may be splined to each other. Of course, the carrier portions 150 and 250 and the piston portions 170 and 270 may be coupled in other ways, such as screw coupling, in addition to spline coupling.

The piston units 170 and 270 are connected to the carrier units 150 and 250. The piston units 170 and 270 rotate together as the carrier units 150 and 250 rotate.

The piston portions 170 and 270 include a piston body 171 and 271, a piston shaft 172 and 272, and a piston connection portion 173 and 273.

The piston bodies 171 and 271 have a hollow interior and are placed so as 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 body (171, 271) is coupled to the piston shaft (172, 272), and piston connection portions (173, 273) are formed at the ends of the piston shafts (172, 272), that is, the ends facing the carrier portions (150, 250). do.

When the carrier parts (150, 250) rotate, the piston connection parts (173, 273) splined with the carrier connection parts (153, 253) rotate, and the rotational movement of the carrier parts (150, 250) moves the piston parts (170, 270). is converted to linear motion.

As the piston units 170 and 270 move in a straight line, the piston units 170 and 270 move toward the brake pad 20. Accordingly, the piston portions 170 and 270 contact the brake pad 20 and pressurize the brake pad 20, thereby generating braking force due to friction between the brake pad 20 and the disc.

The load transfer unit 300 is each connected to a pair of pressing units 100 and 200, and transfers the pressing load from one of the pressing units 100 and 200 to the other pressing unit 100 and 200.

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

The pair of ring gear units 310 are each engaged with the planetary gear units 130 and 230 and can rotate.

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

In this case, the gap between the pair of ring gear units 310 shown in FIG. 4, in other words, the gap between the connection gear units 120 and 220 on one side and the other side is reduced, so that the connection gear units 120 and 220 are aligned accordingly. The gap between the transmission worm gear 72 on one side and the other side becomes smaller.

Additionally, 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 a pair of ring gear units 310 and engage with the ring gear units 310.

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

Each ring gear portion 310 includes a ring gear inner portion 311 and a ring gear outer portion 315.

The ring gear inner portion 311 may be disposed on the outside of the planetary gear portions 130 and 230, and an inner gear portion 312 may be formed along the inner peripheral surface to mesh with the planetary gear portions 130 and 230.

The inner gear part 312 of the ring gear inner part 311 installed on one side (left side in Figure 5) engages with the planetary gear part 130 and rotates clockwise or counterclockwise (as in Figure 5), and the transmission gear part ( Power is transmitted through 320) to the ring gear portion 310 disposed on the other side (right side in Figure 5), specifically, to the ring gear outer portion 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 to engage with the transmission gear portion 320. The ring gear outer portion 315 may be formed integrally with the ring gear inner portion 311.

As the inner gear part 312 of the ring gear inner part 311 installed on one side (left side in FIG. 5) rotates while engaging with the planetary gear part 130, the ring gear outer part 315 is formed integrally with the ring gear inner part 311. ) is also rotated in the same direction.

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

The transmission gear unit 320 is rotated in engagement with the ring gear unit 310, specifically the outer gear unit 316 formed on the outer ring gear unit 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 unit 310.

The rotational power transmitted to the ring gear part 310 on the other side is transmitted to the carrier part 250 coupled with 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 peripheral surface of the sun gear 211, the carrier part 250 coupled to the planetary gear 231 rotates, thereby moving the piston part 270 toward the brake pad 20.

When the press load for pressing the brake pad 20 is not applied uniformly to the pair of press parts 100 and 200, specifically the pair of piston parts 170 and 270, due to the load transfer unit 300. , the pressurized load of the piston unit 170 on one side can be transferred to the piston unit 270 on the other side so that the pair of piston units 170 and 270 are in contact with the brake pad 20 with a uniform pressurized load.

Of course, on the contrary, the pressure load of the piston unit 270 on the other side can be transmitted to the piston unit 270 on one side.

Referring to Figures 4 to 7, in the present invention, the transmission gear part 320 is formed in the shape of a spur gear (SPUR GEAR), and is engaged with the outer gear part 316 formed along the outer peripheral surface of the outer ring gear 315. It is rotated.

However, the transmission gear unit 320 has various forms, such as a bevel gear shape in addition to the spur gear shape, and a helical gear shape in which the gear teeth are 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 is illustrated as having a gear shape, it is not limited to this and is each connected to a pair of ring gear units 310 in a belt shape, and the power of one side pressing part 100 is applied to the other pressing part 200. ), various modifications such as delivery are possible.

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

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

In the present invention, the parking brake device 1 for a vehicle has a plurality of pressing parts 100 and 200 that pressurize the brake pad 20, causing the brake pad 20 to move toward the disk, and creating a gap 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 to this, and various modifications such as forming three or more are possible.

The pressing units 100 and 200 receive power from the driving unit 50 and move linearly back and forth toward the brake pad 20.

Specifically, when power is supplied from the outside and power is generated in the motor unit 60, the power transmission unit 70 connected to the motor unit 60 receives power from the motor unit 60 and rotates. The power transmission unit 70 simultaneously transmits rotational power to a pair of pressing units 100 and 200.

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

As the connection gear parts 120 and 220 rotate, the sun gear parts 110 and 210 also rotate in conjunction with each other, and the planetary gears 131 and 231 meshed with the sun gears 111 and 211 rotate and rotate at the same time. , 211) moves in orbit around the circumference.

As the planetary gears 131 and 231 rotate in revolution, the carrier portions 150 and 250 coupled to the planetary gears 131 and 231 rotate clockwise or counterclockwise. As the carrier parts 150 and 250 rotate, the piston parts 170 and 270 coupled to the carrier parts 150 and 250 move toward the brake pad 20 and contact and pressurize the brake pad 20.

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

As shown in FIG. 6, when the parking brake device 1 for a vehicle is driven, the pressing unit 100 disposed on one side (left in FIG. 6) receives more power than the pressing unit 200 disposed in the other side (right 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 portion 170 on one side is already in contact with the brake pad 20 and the piston portion 270 on the other side is not yet in contact with the brake pad 20, the planetary phase of the pressing portion 100 on one side is The fisherman (130) only performs rotational movements. That is, the planetary gear unit 130 does not rotate.

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

Since the pressing part 100, specifically the piston part 170, disposed on the left side of FIG. 6 can no longer move toward the brake pad 20, the planetary gear 131 only rotates and rotates due to the reaction force therefrom. The ring gear inner portion 311, where the inner gear portion 312 is formed to engage with the ring gear 131, is rotated clockwise or counterclockwise.

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

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

As a result, the power provided from the driving unit 50 is provided to the piston unit 270 on the other side that has not yet come into contact with the brake pad 20, so that the piston unit 270 on the other side is already in contact with the brake pad 20. The linear movement of the piston part 170 on one side in contact with the pad 20 is stopped.

Afterwards, when both the piston parts 170 and 270 on 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 on one side and the other side, respectively, and the pistons on one side and the other side The brake pad 20 is simultaneously pressed with a uniform load by the units 170 and 270.

Referring to Figures 4 to 7, when the pressing load is concentrated on one pressing part 100 of a pair of pressing parts 100 and 200 due to the load transfer unit 300 according to an embodiment of the present invention. , this can be transferred to the pressing unit 200 on the other side, so that the pair of pressing units 100 and 200 can press the brake pad 20 toward the disc with a uniform pressing load.

Likewise, if the pressing load is more concentrated on the other pressing part 200 of the pair of pressing parts 100 and 200, it is transferred to the pressing part 100 on one side and the pair of pressing parts 100 and 200 The brake pad 20 can be pressed toward the disc with a uniform pressing load.

Referring to FIG. 3, the ring gear inner portion 311 protrudes further toward the sun gear portions 110 and 210 (left side in FIG. 3) than the ring gear outer portion 315, and the ring gear inner portion 311 protrudes further toward the connection gear portion 120. , 220) can be inserted into the connection insertion parts 123 and 223.

As a result, the ring gear unit 310 can be prevented from being separated from the connecting gear units 120 and 220 or the sun gear units 110 and 220 when rotational power is transmitted from the driving unit 50.

The carrier portions 150 and 250 are splined to the piston portions 170 and 270, and as a result, the rotational power of the carrier portions 150 and 250 is transferred to the piston portions 170 and 270, specifically the piston connection portions 173 and 273. It can be delivered to .

The piston connection parts (173, 273) are coupled to the piston shafts (172, 272) coupled to the piston bodies (171, 271), and the piston bodies (171, 271) are connected to each other with rotational power transmitted through the carrier parts (150, 250). allows it to move straight toward the brake pad (20).

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will recognize that various modifications and other equivalent embodiments can be made therefrom. You will understand. Therefore, the scope of technical protection of the present invention should be determined by the scope of the patent claims below.

1: Parking brake device for vehicle 10: Caliper housing part
20: brake pad 50: driving unit
60: motor part 70: power transmission part
100, 200: Pressure part
110, 210: Sun gear unit
120, 220: Connection gear part
130, 230: Planetary gear unit
150, 250: Carrier part
170, 270: Piston part
300: load transfer unit
310: Ring gear part
320: Transmission gear unit

Claims (15)

A motor unit that generates power by receiving power from the outside;
A power transmission unit that is directly connected to the motor unit and rotates by transmitting the drive of the motor unit;
A pair of pressurizing units that receive power from the power transmission unit and pressurize the brake pads; and
A load transfer unit installed between the pair of press parts, connected to each of the pair of press parts, and transmitting the press load of one of the pair of press parts to the other press part,
Each of the pair of pressurizing parts,
A sun gear unit that receives power from the power transmission unit and rotates;
A planetary gear unit engaged with the sun gear unit and rotated;
A carrier portion coupled to the planetary gear portion; and
A piston unit connected to the carrier unit and receiving rotational power from the planetary gear unit moves toward the brake pad to press the brake pad.
The load transfer 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,
A parking brake device for a vehicle, characterized in that the pair of ring gear parts are directly engaged with each other.
delete According to paragraph 1,
The power transmission unit,
A transmission shaft directly connected to the motor unit and dynamically connected to the motor unit; and
A parking brake device for a vehicle, comprising a transmission worm gear disposed on both sides of the transmission shaft and transmitting the rotational force of the transmission shaft to the sun gear unit.
According to paragraph 3,
A parking brake device for a vehicle, wherein the transmission worm gear transmits power to the sun gear unit through the connecting gear unit.
According to paragraph 4,
The connection gear part,
A connecting gear body coupled to the sun gear unit; and
A parking brake device for a vehicle, comprising a connecting worm wheel formed on an outer peripheral surface of the connecting gear body and engaged with the transmission worm gear.
According to clause 5,
The connection gear portion further includes a connection insertion portion formed in an inner space of the wall where the connection worm wheel is formed,
A parking brake device for a vehicle, characterized in that the ring gear portion is inserted into the connection insertion portion.
According to clause 6,
A parking brake device for a vehicle, characterized in that the rotation center of the sun gear portion is concentric with the rotation center of the connecting gear portion.
In clause 7,
A parking brake device for a vehicle, characterized in that the sun gear portion and the connecting gear portion are integrally formed.
delete delete A motor unit that generates power by receiving power from the outside;
A power transmission unit that is directly connected to the motor unit and rotates by transmitting the drive of the motor unit;
A pair of pressurizing units that receive power from the power transmission unit and pressurize the brake pads; and
A load transfer unit installed between the pair of press parts, connected to each of the pair of press parts, and transmitting the press load of one of the pair of press parts to the other press part,
Each of the pair of pressurizing parts,
A sun gear unit that receives power from the power transmission unit and rotates;
A planetary gear unit engaged with the sun gear unit and rotated;
A carrier portion coupled to the planetary gear portion; and
A piston unit connected to the carrier unit and receiving rotational power from the planetary gear unit moves toward the brake pad to press the brake pad.
The load transfer part,
a pair of ring gear parts, each of which is rotatable in engagement with the planetary gear part; and
It includes one or more transmission gear parts disposed between a pair of the ring gear parts and engaging the ring gear parts,
Each of the pair of ring gear parts,
a ring gear inner portion in which an inner gear portion is formed along an inner peripheral surface to engage the planetary gear portion; and
A ring gear outer portion coupled to the outer surface of the ring gear inner portion and having an outer gear portion formed along the outer peripheral surface to engage with the transmission gear portion.
According to clause 11,
A parking brake device for a vehicle, characterized in that the inner portion of the ring gear and the outer portion of the ring gear are integrally formed.
According to clause 11,
The ring gear inner portion protrudes further toward the sun gear portion than the ring gear outer portion, and the ring gear inner portion surrounds the sun gear portion and the planetary gear portion.
According to paragraph 1,
A parking brake device for a vehicle, wherein the carrier portion is splined to the piston portion.
According to clause 14,
A parking brake device for a vehicle, wherein the piston unit receives rotational power from the carrier unit and moves linearly back and forth toward the brake pad according to the rotation direction of the carrier unit.

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