Shifting device for lawn mower and the like
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsKazuo Aoi, Takanori Suzuki
Life of this patent
Estimating the term…
Abstract
An improved shifting device for the hydrostatic transmission of a lawn tractor or the like. The shifting device includes means for permitting a greater latitude of movement of the shift lever without effecting either forward or reverse movement. This is done by incorporating a linkage system for interconnecting the shift lever with the transmission control that includes a lost motion connection and by providing a leak path in the hydrostatic transmission so that a greater than normal pressure must be exerted before drive in one direction is possible.
Claims10
In a shifting device for shifting a hydrostatic transmission between a forward position, a neutral position and a reverse position comprising a shift lever moveable through a range of positions from a forward through a neutral area to a reverse area, control means for pressurizing a first conduit to effect forward operation of said transmission and a second conduit to effect reverse operation of said transmission, and means for operating said control means to pressurize said first conduit upon movement of such shift lever from said neutral area into said forward area and said control means to pressurize said second conduit upon movement of said shift lever from said neutral area into said reverse area, the improvement comprising means for delaying the operation of said transmission into at least one of its drive modes upon movement of the shift lever from its neutral position for a predetermined degree of movement toward that drive mode selecting position.
In a shifting device for shifting a hydrostatic transmission between a forward position, a neutral position and a reverse position comprising a shift lever moveable through a range of positions from a forward through a neutral area to a reverse area, control means for pressurizing a first conduit to effect forward operation of said transmission and a second conduit to effect reverse operation of said transmission, and means for operating said control means to pressurize said first conduit upon movement of such shift lever from said neutral area into said forward area and said control means to pressurize said second conduit upon movement of said shift lever from said neutral area into said reverse area, the improvement comprising means for delaying the operation of said transmission into at least one of its drive modes upon movement of the shift lever toward that drive mode selecting position comprising means for reducing the pressure rise in at least one of the conduits upon movement of said shift lever from its neutral area into the area of said shift lever where the conduit is pressurized.
Dependencies are inferred from the claim text.