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US 4,077,305 AGranted
Hydraulic piston motor
AssigneeLinde Aktiengesellschaft
InventorHans Waldemar Stuhr
Life of this patent
Estimating the term…
Abstract
A hydraulic piston motor, preferably a hydrostatic motor of the axial-piston type, has its pistons hydrostatically urged against a surface which is moved relative to or with the pistons in order to reduce static frictional retardation of the pistons upon starting the motor.
Claims17
A hydraulic piston motor comprising a shaft;
- cylinder means operatively connected with said shaft and forming at least one cylinder;
- a piston hydraulically reciprocable in said cylinder for rotating said shaft;
- and temporarily effective start-promoting means effective upon hydraulic pressurization of said cylinder prior to rotation of said shaft to impart to a member acting upon said piston and thereby to said piston an initial relative movement between said piston and said cylinder to break adhesive static friction therebetween and thereby decrease the friction retarding starting displacement of said piston.
A hydraulic piston motor comprising a shaft;
- cylinder means operatively connected with said shaft and forming at least one cylinder;
- a piston hydraulically reciprocable in said cylinder for rotating said shaft;
- means effective upon hydraulic pressurization of said cylinder prior to rotation of said shaft to impart to a member acting upon said piston and thereby to said piston an initial relative movement between said piston and said cylinder to break adhesive static friction therebetween and thereby decrease the friction retarding starting displacement of said piston;
- and
- rotation sensing means effective upon hydraulic pressurization of said motor under standstill of said shaft for initiating said relative movement.
2 more elements
An axial-piston motor system comprising:
- a housing;
- a cylinder drum rotatable in said housing and formed with a plurality of annularly spaced cylinder bores and respective pistons reciprocable within said bores;
- a body formed with an inclined surface bearing against said pistons;
- a shaft operatively connected with said cylinder drum for rotation upon hydraulic pressurization of said cylinder bores to displace said pistons;
- and
- temporarily effective start promoting means for axially displacing said body upon the development of a pressure at said bores sufficient to rotate said drum in the absence of static friction between said pistons and the walls of said bores for breaking said static friction.
3 more elements
An axial-piston motor system comprising:
- a housing;
- a cylinder drum rotatable in said housing and formed with a plurality of annularly spaced cylinder bores and respective pistons reciprocable within said bores;
- a body formed with an inclined surface bearing against said pistons;
- a shaft operatively connected with said cylinder drum for rotation upon hydraulic pressurization of said cylinder bores to displace said piston;
- and
- temporarily effective start-promoting means for axially displacing said body upon the development of a pressure at said bores sufficient to rotate said drum in the absence of static friction between said pistons and said body for breaking said static friction.
3 more elements
An axial-piston motor system comprising:
- a housing;
- a cylinder drum rotatable in said housing and formed with a plurality of annularly spaced cylinder bores and respective pistons reciprocable within said bores;
- a body formed with an inclined surface bearing against said pistons;
- a shaft operatively connected with said cylinder drum for rotation upon hydraulic pressurization of said cylinder bores to displace said piston;
- and
- temporarily effective start-promoting means for axially displacing said drum upon the development of a pressure at said bores sufficient to rotate said drum in the absence of static friction between said pistons and the walls of said bores for breaking said static friction.
3 more elements
An axial-piston motor system comprising:
- a housing;
- a cylinder drum rotatable in said housing and formed with a plurality of annularly spaced cylinder bores and respective pistons reciprocable within said bores;
- a body formed with an inclined surface bearing against said pistons;
- a shaft operatively connected with said cylinder drum for rotation upon hydraulic pressurization of said cylinder bores to displace said piston;
- and
- an auxiliary piston tangential to said shaft effective with lost motion against the force of a spring and actuated upon the development of a pressure at said bores sufficient to rotate said drum in the absence of static friction between said pistons and the walls of said bores for engaging said shaft to initiate rotation thereof and break said static friction.
3 more elements
Dependencies are inferred from the claim text.