초록 ▼

A hydraulic priority circuit for a fork lift truck having a primary work system for providing power steering and a secondary work system for raising a fork along a mast and for tilting the mast. A variable speed electric motor drives a variable output pump to supply pressurized fluid which is divide

A hydraulic priority circuit for a fork lift truck having a primary work system for providing power steering and a secondary work system for raising a fork along a mast and for tilting the mast. A variable speed electric motor drives a variable output pump to supply pressurized fluid which is divided by a flow divider into two streams leading to the primary and secondary work systems, respectively. A priority solenoid valve is controlled by a device which detects preselected conditions of the truck to direct all the fluid in the stream leading to the primary work system either to the primary work system when the truck is in drive or is rolling, or to the secondary work system when the truck is in neutral and stationary.

대표청구항 ▼

A fluid circuit, comprising: a primary work system, said primary system having first motor means for performing work in response to fluid flow; a secondary work system, said secondary work system having second motor means for performing work in response to fluid flow; pump means for providing a flow

A fluid circuit, comprising: a primary work system, said primary system having first motor means for performing work in response to fluid flow; a secondary work system, said secondary work system having second motor means for performing work in response to fluid flow; pump means for providing a flow of fluid for said first motor means and said second motor means; means for dividing the fluid flow from said pump means into first and second streams; means for controlling the direction of flow of the first stream, said controlling means being constructed to be operable independently of said primary work system and said secondary work system and to have one position and at least one other position; means for directing all of the first stream to said primary work system or said secondary work system in response to the position of said controlling means; and means for delivering the second stream from said dividing means to said secondary work system. A fluid circuit, as set forth in claim 1, wherein said means for controlling includes: a vehicle drive-direction selector, said selector being constructed to be movable to a plurality of positions; and means for sensing the position of said drive-direction selector and for providing control signals in response to the positions of said selector, said directing means being responsive to the control signals.