Dual brake slack adjuster and systems, components, and methods thereof

Patent metadata

Field	Value
Publication number	US-11619274-B2
Application number	US-202017122190-A
Country	US
Kind code	B2
Filing date	Dec 15, 2020
Priority date	Dec 15, 2020
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

A slack adjuster and systems, components, and methods can comprise a base enclosure, a pair of floating piston assemblies, and a pair of sensing piston assemblies. The base enclosure can define an internal chamber that extends along a longitudinal axis of the base enclosure and an inlet channel that extends along a transverse axis of the base enclosure perpendicular to the longitudinal axis. The internal chamber can have a first chamber portion, a second chamber portion, and a center chamber portion that intersects the inlet channel. The floating piston assemblies can be respectively provided in the first and second chamber portions. Likewise, the sensing piston assemblies can be respectively provided in association with the floating piston assemblies.

First claim

The invention claimed is:

1. A multi-wheel braking system for a vehicle comprising:
a hydraulic fluid source adapted to control supply of hydraulic fluid responsive to a braking input; and
a dual slack adjuster having an inlet port to receive the hydraulic fluid from the hydraulic fluid source, a first outlet port to selectively pass the hydraulic fluid to control braking of a first wheel of the vehicle, and a second outlet port to selectively pass the hydraulic fluid to control braking of a second wheel of the vehicle, the dual slack adjuster including:
a base enclosure defining an internal chamber that extends along a longitudinal axis of the base enclosure, an inlet channel that extends from the inlet port along a transverse axis of the base enclosure perpendicular to the longitudinal axis, at least one first backflow channel that extends from the inlet channel in a first direction of the longitudinal axis, and at least one second backflow channel that extends from the inlet chap a second direction of the longitudinal axis opposite the first direction,
a first sensing piston assembly at a first outlet port side and a second sensing piston assembly at a second outlet port side, and
a first floating piston assembly at the first outlet port side and a second floating piston assembly at the second outlet port side,
wherein the internal chamber includes a first chamber portion at the first outlet port side, a second chamber portion at the second outlet port side, and a center chamber portion that intersects the inlet channel and intervenes between the first and second chamber portions,
wherein the first chamber portion accommodates the first floating piston assembly and the second chamber portion accommodates the second floating piston assembly such that each of the first and second floating piston assemblies is movable to each of a first position and a second position within the first and second chamber portions, respectively,
wherein in the first position of the first floating piston assembly the first sensing piston assembly is entirely in the first chamber portion and in the second position of the first floating piston assembly the first sensing pi ston assembly is partly in the center chamber portion,
wherein in the first position of the second floating piston assembly the second sensing piston assembly is entirely in the second chamber portion and in the second. position of the second floating piston assembly the second sensing piston assembly is partly in the center chamber portion,
wherein all portions of each of the at least one first backflow channel and all portions of each of the at least one second backflow channel remain in a same position relative to the base enclosure and the inlet channel when the first and second floating piston assemblies are respectively in each of the first and second positions,
wherein each of the at least one first backflow channel and each of the at least one second backflow channel are entirely distinct from the first chamber portion, the second chamber portion, and the center chamber portion of the internal chamber, and
wherein no portion of each of the at least one first backflow channel and the at least one second backflow channel extends along the longitudinal axis of the base enclosure.

2. The multi-wheel braking system according to claim 1 ,
wherein the at least one first backflow channel includes one first backflow channel at a first side of the longitudinal axis closer to the inlet port and another first backflow channel at a second side of the longitudinal axis farther from the inlet port, and
wherein the at least one second backflow channel includesone second backflow channel at the first side of the longitudinal axis closer to the inlet port and another second backflow channel at the second side of the longitudinal axis farther from the inlet port.

3. The multi-wheel braking system according to claim 1 , wherein the base enclosure includes:
a first end cap having the first outlet port,
a second end cap haying the second outlet port, and
a central base threadedly receiving each of the first end cap and the second end cap and having the inlet port, the inlet channel, the at least one first backflow channel, and the at least one second backflow channel.

4. The multi-wheel braking system according to claim 1 ,
wherein a first spring biases a first piston of the first floating piston assembly toward the first outlet port, and
wherein a second spring biases a second piston of the second floating piston assembly toward the second outlet port.

5. The multi-wheel braking system according to claim 1 ,
wherein a first flow path for the hydraulic fluid is directly from the first chamber portion through the first sensing piston assembly, then through the first floating piston assembly to the first outlet port, and
wherein a second flow path for the hydraulic fluid is directly from the second chamber portion through the second sensing piston assembly, then through the second floating piston assembly to the second outlet port.

6. The multi-wheel braking system according to claim 1 ,
wherein a first piston of the first floating piston assembly extends to more than half of a first length of a first cage of the first sensing piston assembly, and
wherein a second piston of the second floating piston assembly extends to more than half of a second length a second cage of the second sensing piston assembly.

7. A method comprising:
providing a dual slack adjuster assembly having an inlet port to receive brake fluid, a first outlet port to selectively pass the brake fluid, and a second outlet port to selectively pass the brake fluid; and
providing the brake fluid within the dual slack adjuster assembly,
wherein the dual slack adjuster assembly includes:
a base enclosure defining an internal chamber that extends along a longitudinal axis of the base enclosure and an inlet channel that extends from the inlet port along a transverse axis of the base enclosure perpendicular to the longitudinal axis, the internal chamber having a first chamber portion, a second chamber portion, a center chamber portion that intersects the inlet channel and is in fluid communication with the first and second chamber portions, a first backflow channel that extends from the inlet channel in a first direction of the longitudinal axis, and a second backflow channel that extends from the inlet channel in the direction of the longitudinal axis opposite the first direction, the first and second backflow channels being parallel to each other and spaced apart from each other in a direction of the transverse axis,
a pair of floating piston assemblies respectively slidingly provided in the f rst and second chamber portions, and
a pair of sensing piston assemblies respectively supported on the floating piston assemblies,
wherein said providing the brake fluid to the dual slack adjuster assembly causes each set of floating piston and sensing piston assemblies to respectively slide within the first and second chamber portions to one of a first position and a second position, and
wherein in the first position each of the sensing piston assemblies is entirely outside of the center chamber portion of the internal chamber.

8. The method according to claim 7 , wherein in the second position each of the sensing piston assemblies extends into the center chamber portion of the internal chamber.

9. The method according to claim 7 , wherein said providing the brake fluid includes, for each set of floating piston and sensing piston assemblies, causing the brake fluid to respectively flow directly from the first and second chamber portions through the sensing piston assemblies.

10. The method according to

Assignees

• Caterpillar Inc

Inventors

• Wei Puning

Classifications

• F16D65/22

  adapted for pressing members apart {, e.g. for drum brakes} · CPC title

• F16D2125/06

  Pistons · CPC title

• F16D2121/04

  acting on a piston-type actuator, e.g. for liquid pressure · CPC title

• F16D65/74 Primary

  self-acting in one direction · CPC title