Steering control apparatus for use in endless track type tractors and control valve for use therewith
AssigneeKabushiki Kaisha Komatsu Seisakusho
InventorKazutoshi Imon
Life of this patent
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Abstract
A steering control apparatus for use in endless track type tractor which comprises a pair of control members, a barrel rotatably mounted on a stationary shaft, said control members being fixedly secured to the barrel, a pair of valve connecting levers fixedly secured to the barrel, a valve for steering control clutch for releasing the clutch when actuated, the valve having stems mounted at both ends thereof, and a pair of clutch yokes for releasing clutches when actuated, the clutch yokes being connected to the valve.
Claims11
A steering control apparatus for an endless track type tractor comprising a pair of control members,
- a barrel rotatably mounted on a stationary shaft, said control members being fixedly secured to said barrel,
- a pair of valve connecting levers fixedly secured to said barrel on a first side thereof,
- a driving rod connected to a second side of each said valve connecting levers,
- a spring means connecting each said driving rod to a crank means,
- valve means for steering control clutch for releasing said clutch when actuated, said valve means having stem members mounted at both ends thereof, said stem members being connected to each of said crank means,
- a pair of clutch yokes for releasing clutches when actuated, said clutch yokes being connected to said valve means,
- wherein said valve means is of a mono-spool type,
- a pair of brakes, with a pair of brake connecting levers fixedly secured to said barrel, and
- means for biasing said control members in a clockwise direction.
A control valve for releasing a clutch in steering control apparatus of an endless track type tractor comprising a valve body having an inlet port for pressurized fluid, a pair of ports for supplying pressurized fluid to the right and left clutches to release one of them, and a pair of drain ports,
- a spool slidably disposed in said valve body to selectively open or close said each port,
- a pair of chambers defined at both ends of said spool in said valve body,
- a pair of stem members slidably and coaxially disposed with said spool in said valve body at both ends thereof for slidable actuation of said spool, and
- a pair of spring means disposed in said chambers between said spool and said stem members.
A control valve for releasing a clutch in steering control apparatus of an endless track type tractor comprising a valve body having a pair of fluid inlet ports, a pair of ports for supplying fluid to the right and left hand clutches to release one of them, and a drain port,
- a spool slidably disposed in said valve body to selectively open or close each of said ports,
- a pair of chambers defined at both ends of said spool in said valve body,
- a pair of stem members slidably and coaxially disposed with said spool in said valve body at both ends thereof, and
- a pair of spring means disposed in said chambers, said spring means being adapted to balance with each other.
Dependencies are inferred from the claim text.