# US 9,004,254 B2 · Parking brake system

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- Number: US 9,004,254 B2
- Document ID: US9004254B2
- Status: Granted
- Kind: B2
- Application number: 13/315,192
- Filed: 2011-12-08
- Published: 2013-01-24
- Granted: 2015-04-14
- Earliest claimed: 2011-07-21
- Assignees: Hyundai Motor Company
- Applicants: Sung Wook Jang; Tae Whan Kim; Da Hui Kim
- Inventors: Sung Wook Jang; Tae Whan Kim; Da Hui Kim
- Web page: https://patentgrep.com/patent/US9004254B2

## CPC

- B60T 11/046: {Using cables (B60T11/043 takes precedence)}
- B60T 1/005: {by locking of wheel or transmission rotation}
- F16H 63/3416: {Parking lock mechanisms or brakes in the transmission}
- F16H 63/3483: {with hydraulic actuating means}
- F16H 63/3491: {Emergency release or engagement of parking locks or brakes}
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- F16H: GEARING

## Abstract

A parking brake system that uses a locking device to maintain a parking release condition may include a control lever that may be rotatably connected to the exterior of a transmission, a shift cable that may be rotatably connected to an end of the control lever, the locking device that may be connected to the other end of the shift cable and selectively maintains the parking release condition, and a parking device that includes a piston member in a cylinder and that may be connected to the end of the control lever and uses hydraulic pressure to move the control lever and the shift cable such that the parking release condition may be maintained.

## Claims

### Claim 1

A parking brake system that uses a locking device to maintain a parking release condition, comprising:
a control lever that is rotatably connected to an exterior of a transmission;
a shift cable, one end of which is rotatably connected to an end of the control lever;
the locking device that is connected to the other end of the shift cable and selectively maintains the parking release condition; and
a parking device that includes a piston member in a cylinder and that is connected to the end of the control lever and uses hydraulic pressure to move the control lever and the shift cable such that the parking release condition is maintained,
wherein the locking device includes:
a locking lever that is connected to the other end of the shift cable and selectively rotated by the shift cable;
a locking pin that is slidably disposed in the locking lever to ascend and descend relative to the locking lever;
a locking spring that elastically supports the locking pin; and
a detent that is disposed at an upper end side of the locking pin wherein an engagement position of the locking pin with the detent is varied by rotation of the locking lever according to a stage of a shift speed.

### Claim 2 (depends on 1)

The parking brake system of claim 1, wherein the locking device further includes a rotation shaft that is disposed at a lower end portion of the locking lever such that the locking lever rotates about the rotation shaft.

### Claim 3 (depends on 1)

The parking brake system of claim 1, further including a locking release link that contacts the locking pin and rotates by a hinge that is formed therein.

### Claim 4 (depends on 3)

The parking brake system of claim 3, wherein an end of the locking release link is coupled to a solenoid valve and selectively operated thereby.

### Claim 5 (depends on 3)

The parking brake system of claim 3, wherein an emergency button is disposed at an upper end side of the locking release link and the locking release link actuated by the emergency button moves the locking pin to change the engagement position to implement a parking mode in an emergency.

### Claim 6 (depends on 5)

The parking brake system of claim 5, wherein the emergency button is operated by a parking button.

### Claim 7 (depends on 1)

The parking brake system of claim 1, wherein the detent is formed as a step structure having at least a step according to a stage of a shift speed in the transmission.

### Claim 8 (depends on 1)

The parking brake system of claim 1, wherein an oil supply hole is formed at one side of the cylinder to selectively supply oil to the piston member.

### Claim 9 (depends on 1)

The parking brake system of claim 1, further including:
a pinion gear that is formed at a lower end portion of the locking lever; and
a rack gear that is selectively engaged with the pinion gear and rotates the pinion gear formed to the locking lever to release an emergency parking mode.

### Claim 10 (depends on 9)

The parking brake system of claim 9, wherein the rack gear is disposed at a pushrod, and a return spring is connected to a lower end portion of the pushrod.

### Claim 11 (depends on 10)

The parking brake system of claim 10, wherein the rack gear is disposed without being engaged with the pinion gear when the return spring extends with a predetermined amount.

### Claim 12 (depends on 9)

The parking brake system of claim 9, wherein an emergency parking release hole is formed at an upper end portion of the locking lever to move the locking pin to a position of a parking mode.