Sequential parking brake assembly

Patent metadata

Field	Value
Publication number	US-2017191539-A1
Application number	US-201715461673-A
Country	US
Kind code	A1
Filing date	Mar 17, 2017
Priority date	Jan 27, 2015
Publication date	Jul 6, 2017
Grant date	—

Abstract

An assembly includes a brake system comprising, a parking brake assembly including a first drive shaft and a second drive shaft. The assembly also includes two or more opposing brake pads, and a rotor extending between the two or more opposing brake pads. During use, the first drive shaft is moved so that a first portion of the brake pad is moved relative to the rotor. The second drive shaft is moved so that a second portion of the brake pad is moved relative to the rotor. One of the first portion of the brake pad or the second portion of the brake pad is moved relative to the rotor before the other of the first portion of the brake pad or the second portion of the brake pad is moved relative to the rotor.

First claim

1 . A brake system comprising:
a first brake piston; a second brake piston; and a brake pad; wherein the first brake piston is moved so that a first portion of the brake pad is moved relative to a rotor, wherein the second brake piston is moved so that a second portion of the brake pad is moved relative to the rotor, and wherein either the first brake piston or the second brake piston is moved before the other of the first brake piston or the second brake piston is moved relative to the rotor.

2 . The brake system of claim 23 , wherein the brake includes:
i. a first gear that engages the first drive shaft and disengages the first drive shaft; ii. a second gear that engages the second drive shaft; and iii. a motor gear unit in communication with the first gear and causing both the first gear and the second gear to rotate; wherein the first gear engages the first drive shaft so that the first drive shaft rotates with the first gear and moves the first portion of the brake pad relative to the rotor, wherein the first gear disengages the first drive shaft so that the first drive shaft does not rotate with the first gear and does not move the first portion of the brake pad relative to the rotor, and wherein the second gear rotates the second drive shaft and moves the second portion of the brake pad relative to the rotor.

3 . The brake system of claim 2 , wherein the motor gear unit rotates the first gear in a first direction and in a second direction,
wherein when the motor gear unit rotates the first gear in the first direction and the first gear engages the first drive shaft, the first drive shaft moves the first towards the rotor to create a brake force or a parking brake force, wherein the second drive shaft moves the second brake piston, which move the second portion of the brake pad towards the rotor to create the brake force or the parking brake force when the motor gear unit rotates the first gear in the first direction regardless if the first gear engages or disengages the first drive shaft, wherein when the motor gear unit rotates the first gear in the second direction and the first gear engages the first drive shaft, the first drive shaft moves the first brake piston which moves the first portion of the brake pad away from the rotor to release the brake force on the parking brake force, and wherein the second drive shaft moves the second brake piston which moves the second portion of the brake pad away from the rotor to release the brake force or the parking brake force when the motor gear unit rotates the first gear in the second direction regardless if the first gear selectively engages or disengages the first drive shaft.

4 . (canceled)

5 . (canceled)

6 . (canceled)

7 . (canceled)

8 . A brake assembly including:
a brake pad: a first brake piston; a second brake piston a first drive shaft in communication with the first brake piston; a first gear that disengages the first drive shaft and the first shaft; a second drive shaft in communication with the second brake piston; a second gear engaging the second drive shaft; and a motor gear unit engaging the first gear and causing both the first gear and the second gear to rotate in a first direction and a in second direction; wherein when the first gear engages the first drive shaft, the first drive shaft rotates with the first gear, which causes the first brake piston to move a first portion of the brake pad relative to a rotor, wherein when the first gear disengages the first drive shaft, the first drive shaft does not rotate with the first gear and the first brake piston does not move the first portion of the brake pad relative to the rotor, and wherein the second gear rotates the second drive shaft so that the second brake piston is moved, which moves a second portion of the brake relative to the rotor.

9 . The brake assembly of claim 26 , wherein when the motor gear unit rotates the first gear in the first direction and the first gear engages and first drive shaft, the first drive shaft moves the first brake piston which moves the first portion of the brake pad towards the rotor to create a brake force or a parking brake force, and
wherein the second drive shaft moves the second brake piston, which moves the second portion of the brake pad towards the rotor to create the brake force or the parking brake force when the motor gear unit rotates the first gear in the first direction regardless if the first gear selectively engages or disengages the first drive shaft, wherein when the motor gear unit rotates the first gear in the second direction and the first gear engages the first drive shaft, the first drive shaft moves the first brake piston which moves the first portion of the brake pad away from the rotor to release the brake force on the parking brake force, and wherein the second drive shaft moves the second brake piston which moves the second portion of the brake pad away from the rotor to release the brake force or the parking brake force when the motor gear unit rotates the first gear in the second direction regardless if the first gear selectively engages or disengages the first drive shaft.

10 . (canceled)

11 . The brake assembly of claim 8 , wherein the first gear includes one or more roller assemblies and the first drive shaft includes detents,
wherein the one or more roller assemblies rotate with the first gear and selectively engage the detents so that the first drive shaft rotates with the first gear and moves the first portion of the brake pad relative to the rotor, and wherein the one or more roller assemblies selectively disengage the detents so that the first drive shaft does not rotate with the first gear and does not move the first portion of the brake pad relative to the rotor.

12 . The brake assembly of claim 11 , wherein the parking brake system includes
a clutch plate located between the first gear and the first drive shaft, the clutch plate includes a track and one or more detents, wherein the one or more roller assemblies engage the detents of the clutch plate when the one or more roller assemblies engage the detents of the first drive shaft, and wherein the one or more roller assemblies engage the track when the one or more roller assemblies disengage the detents of the first drive shaft.

13 . The brake assembly of claim 11 , wherein each of the roller assemblies include:
i. a pivot arm pivoting about a pin located on the first gear; ii. a pivot post connected to the pivot arm; iii. and a roller engaging the pivot post, wherein the pivot arm is biased so that the roller engage the detents of the first drive shaft when the pair of roller assemblies selectively engage the detents and pivots about the pin to disengage the detents when the pair of roller assemblies selectively disengage the detents.

14 . A method of applying a brake comprising:
applying a torque to a first drive shaft so that the first drive shaft rotates and moves a first brake piston towards a rotor; rotating a second drive shaft so that a second brake piston is moved towards the rotor, wherein either the first brake piston or the second brake piston is moved towards the rotor before the other of the first brake piston or the second brake piston is moved towards the rotor.

15 . The method of claim 27 , wherein the step of engaging the first drive shaft includes:
biasing one or more roller assemblies into one or more detents located on the first drive shaft, wherein the step of disengaging the first drive shaft includes biasing the one or more roller assemblies out of one or more detents located on

Assignees

• Akebono Brake Ind

Inventors

• Chelaidite Galus
• Al-Mahshi Waleed Mahmoud
• Thomas Carla

Classifications

• F16D2055/0091

  Plural actuators arranged side by side on the same side of the rotor · CPC title

• F16D55/227 Primary

  by two {or more} pins · CPC title

• F16D2125/40

  Screw-and-nut · CPC title

• F16D2121/24

  using motors · CPC title

• F16D65/0068

  Brake calipers · CPC title