초록 ▼

A hydrostatic transmission having a variable displacement pump whose control element varies the transmission ratio and output direction of the transmission is controlled by a hydraulic servomechanism including a direction-reversing valve and a cylinder connected to this valve. A direction selector a

A hydrostatic transmission having a variable displacement pump whose control element varies the transmission ratio and output direction of the transmission is controlled by a hydraulic servomechanism including a direction-reversing valve and a cylinder connected to this valve. A direction selector acts upon the valve and a mechanical or hydraulic locking mechanism is provided to prevent shifting of the valve until the control element of the pump has been restored to its neutral position before direction change.

대표청구항 ▼

A hydrostatic transmission comprising: a hydrostatic pump driven by a prime mover and constituting a first hydraulic machine, a hydrostatic motor connected to a load and constituting a second hydrostatic machine, and hydraulic lines connecting said motor and said load in a main working network, one

A hydrostatic transmission comprising: a hydrostatic pump driven by a prime mover and constituting a first hydraulic machine, a hydrostatic motor connected to a load and constituting a second hydrostatic machine, and hydraulic lines connecting said motor and said load in a main working network, one of said machines having a control element shiftable between extreme positions through a neutral position to control the direction of operation of said load and the transmission ratio between said machines; a hydraulic cylinder connected to said element for displacing same; a three-position valve having a neutral position and a pair of limiting positions; a direction selector for selecting the positions of said valve and thereby controlling said cylinder correspondingly to displace said element; force-generating means operated by said selector to apply a corresponding force to said valve tending to urge said valve into the selected position thereof; locking means connected with said valve for preventing the displacement of said valve by said force-generating means unless said element is in its neutral position; and means responsive to the position of said element for releasing said locking means in the neutral position of said element.