Auxiliary system for vehicle implements

Patent metadata

Field	Value
Publication number	US-10724554-B2
Application number	US-201716098013-A
Country	US
Kind code	B2
Filing date	Apr 25, 2017
Priority date	May 3, 2016
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A hydraulic system includes one or more hydraulic subsystems that have a source of additional flow for supplying an auxiliary system. The hydraulic system may include one or more actuator systems, a boost system, and a further hydraulic system, such as a steering system. The source of additional flow for supplying the auxiliary system may include: sizing the boost system for providing both full boost function and auxiliary function, sizing the steering system for providing both full steering function and auxiliary function, utilizing available flow from an unused actuator function, and/or utilizing a selector manifold for actively selecting the source of auxiliary flow based on the flow and pressure demands of the respective hydraulic systems. Such a hydraulic system enables flow to be available to an auxiliary function regardless of the flow requirements for the actuator functions and/or other vehicle functions, while also minimizing interactions and flow disruptions to the various hydraulic subsystems.

First claim

What is claimed is:

1. A hydraulic system for a vehicle comprising:
at least one actuator system that supplies hydraulic fluid to control all of a set of primary hydraulically actuated functions, the at least one actuator system having a maximum flow requirement for the set of primary hydraulically actuated functions;
a boost system having a maximum flow requirement for supplying or accepting hydraulic fluid to or from the at least one actuator system;
an additional system that supplies hydraulic fluid to control an additional primary hydraulically actuated function, the additional system having a maximum flow requirement for the additional primary hydraulically actuated function; and
an auxiliary system having an auxiliary outlet port for removable connection of an auxiliary implement comprising a detachable tool, the auxiliary system being configured to supply hydraulic fluid via the auxiliary outlet port to control an auxiliary hydraulic function of the auxiliary implement, the auxiliary system having a desired flow requirement for operating the auxiliary implement;
wherein at least one of the boost system, the additional system, and the at least one actuator system is selectively in fluid communication with the auxiliary system for supplying hydraulic fluid to the auxiliary implement via the auxiliary outlet port when the auxiliary implement is fluidly connected to the vehicle via the auxiliary outlet port;
wherein at least one of the boost system, the additional system, and the at least one actuator system includes an additional source of flow for satisfying at least a portion of the desired flow requirement of the auxiliary system for operating the auxiliary implement when the auxiliary implement is fluidly connected to the vehicle via the auxiliary outlet port; and
wherein all of the set of primary hydraulically actuated functions and the additional primary hydraulic function are fully operable when the auxiliary implement is disconnected from the auxiliary system.

2. The hydraulic system according to claim 1 , wherein the at least one actuator system includes a primary hydraulic pump for satisfying the maximum flow requirement of the at least one actuator system; and
wherein at least one of the boost system and the additional system includes at least one hydraulic pump that collectively or singly satisfies the respective maximum flow requirements of the boost system, the additional system, and/or at least some of the desired flow for the auxiliary system.

3. The hydraulic system according to claim 2 , wherein the at least one actuator system includes an unbalanced actuator having an extend chamber and a retract chamber to and from which hydraulic fluid is supplied and returned in opposite directions to effect operation of at least one primary function of the set of primary hydraulically actuated functions;
wherein the primary hydraulic pump is a bi-directional pump operable in one direction for supplying hydraulic fluid through a first fluid flow line to the extend chamber of the unbalanced actuator, and operable in another direction for supplying hydraulic fluid through a second fluid flow line to the retract chamber of the unbalanced actuator; and
wherein the boost system includes a boost pump for supplying hydraulic fluid to a fluid communication line selectively in fluid communication with one of the first or second fluid flow lines.

4. The hydraulic system according to claim 3 , wherein the boost system is selectively in fluid communication with the auxiliary system, and
wherein the additional source of flow includes the boost pump that is sized to satisfy the maximum flow requirement for the boost system and additional flow for satisfying at least a portion of the desired flow requirement of the auxiliary system.

5. The hydraulic system according to claim 1 , wherein the additional system is a steering system, the steering system including a steering pump for supplying hydraulic fluid to a steering circuit to satisfy the maximum flow requirement for a hydraulically actuated steering function as the additional primary hydraulically actuated function; and
wherein the boost system includes a boost pump for supplying hydraulic fluid to a boost circuit to satisfy the maximum flow requirement for accepting or supplying hydraulic fluid from or to the at least one actuator system.

6. The hydraulic system according to claim 5 ,
wherein the at least one actuator system includes a primary hydraulic pump for satisfying the maximum flow requirement of the at least one actuator system;
the hydraulic system further comprising:
an electric motor for driving the primary hydraulic pump; and
a single electric motor for driving both the boost pump and the steering pump.

7. The hydraulic system according to claim 5 , wherein the steering system is selectively in fluid communication with the auxiliary system, and
wherein the additional source of flow includes the steering pump that is sized to satisfy the maximum flow requirement for the steering system and additional flow for satisfying at least a portion of the desired flow requirement of the auxiliary system.

8. The hydraulic system according to claim 7 , wherein the boost system is in fluid communication with the steering system and the auxiliary system;
wherein the boost system includes the boost pump that provides flow to the auxiliary system for satisfying at least a portion of the desired flow requirement of the auxiliary system; and
wherein the steering system provides flow to the auxiliary system to supplement at least a portion of the flow provided to the auxiliary system by the boost system.

9. The hydraulic system according to claim 7 , wherein the boost system supplies hydraulic fluid to the auxiliary system through an auxiliary outlet line, and
wherein hydraulic fluid is returned from the auxiliary system to the boost system through an auxiliary return line at a return pressure sufficient for providing at least a portion of the maximum flow requirement of the boost system.

10. The hydraulic system according to claim 9 , wherein the boost system is in fluid communication with the steering system and the auxiliary system;
wherein the boost system and the auxiliary system each have a maximum hydraulic pressure and/or flow requirement; and
wherein, if the maximum hydraulic pressure and/or flow requirement of the auxiliary system is less than the maximum hydraulic pressure and/or flow requirement of the boost system, then the boost system and the steering system each supply pressure and/or flow to satisfy at least a portion of the desired pressure and/or flow requirement of the auxiliary system and the maximum pressure and/or flow requirement of the boost system.

11. The hydraulic system according to claim 1 ,
wherein the boost system and the auxiliary system each have a maximum hydraulic pressure and/or flow requirement;
wherein, if the maximum hydraulic pressure and/or flow requirement of the auxiliary system is no less than the maximum hydraulic pressure and/or flow requirement of the boost system, then return pressure and/or flow from the auxiliary system returns to the boost system at a return pressure sufficient for providing at least a portion of the maximum flow requirement and/or maximum pressure requirement of the boost system; and
wherein, if the maximum hydraulic pressure and/or flow requirement of the auxiliary system is less than the maximum hydraulic pressure and/or flow requirement of the boost system, then flow from a boost pump is divided such that at least a portion of the flow from the boost pump is provided to the auxiliary system and the remaining flow is delivered through a control valve to the b

Assignees

• Parker Hannifin Corp

Inventors

• Thompson Randall D
• Gomm Ralf
• Bhaskar Vivek
• Eriksson Björn

Classifications

• F15D1/04

  Arrangements of guide vanes in pipe elbows or duct bends; Construction of pipe conduit elements for elbows with respect to flow, e.g. for reducing losses of flow · CPC title

• E02F9/2292

  Systems with two or more pumps · CPC title

• F15B2211/7142

  the output members being arranged in multiple groups · CPC title

• F15B11/17 Primary

  using two or more pumps · CPC title

• F15B2211/613

  Feeding circuits · CPC title