Abstract A hydraulic reciprocating engine having a piston which is movable in a cylinder, at least one piston rod is secured to the piston. On one side of the piston a supply pressure prevails, and on the other side a regulating pressure prevails. A pressure regulating system is connected between the duct in which the supply pressure and the regulating pressure prevails. The value of a regulating pressure is adjustable in accordance with the value of the supply pressure and in accordance with an adjusting element, for example a spring, acting on a regulating valve of the system. The pressure-regulating system has at least one regulating member, in which the ratio of the surfaces of the regulating member has such a value that in the absence of a force exerted by the adjusting element, the regulating pressure adjusted by the pressure regulating valve relative to the supply pressure, has a value which is inversely proportional to the ratio of the value of the piston surfaces of the hydraulic motor.
A hydraulic reciprocating engine comprising a cylinder, a piston having a first end face and a second end face axially movable within said cylinder, at least one piston rod attached to one of the end faces of said piston and extending beyond the confines of said cylinder so as to be available for exerting an external force, said piston dividing the cylinder into first and second end spaces respectively, a first duct communicating with said first end space in which an adjustable regulating pressure prevails for acting on said first end face of the piston, a second duct communicating with said second end space in which a supply pressure prevails for acting on the second end face of said piston, a pressure-regulating system connected between said first and second ducts for adjusting the value of said regulating pressure, said pressure-regulating system comprising an adjustable valve member and an adjusting element arranged for exerting a force on said valve member, the ratio of opposed surface areas of said valve member having a value such that in the absence of a force exerted by said adjusting element said regulating pressure has a value which is inversely proportional to the ratio of the surface area of said first and second piston end faces, whereby said regulating pressure will be adjusted by said pressure-regulating valve in accordance with the value of said supply pressure and said adjusting element.
Claim 2
Dependent Claim
234 words
A hydraulic reciprocating engine comprising a cylinder, a piston having a first end face and a second end face axially movable within said cylinder, at least one piston rod attached to one of the end faces of said piston and extending beyond the confines of said cylinder so as to be available for exerting an external force, said piston dividing the cylinder into first and second end spaces respectively, a first duct communicating with said first end space in which an adjustable regulating pressure prevails for acting on said first end face of the piston, a second duct communicating with said second end space in which a supply pressure prevails for acting on the second end face of said piston, a pressure-regulating system connected between said first and second ducts for adjusting the value of said regulating pressure, said pressure-regulating system comprising an adjustable valve member and an adjusting element arranged for exerting a force on said valve member, the ratio of opposed surface areas of said valve member having a value such that in the absence of a force exerted by said adjusting element said regulating pressure has a value which is inversely proportional to the ratio of the surface area of said first and second piston end faces, whereby said regulating pressure will be adjusted by said pressure-regulating valve in accordance with the value of said supply pressure and said adjusting element.
Claim 3
Dependent Claim
15 words
The hydraulic reciprocating engine according to claim 1 wherein said adjusting element is a spring.