Abstract: A hydraulic machine includes a housing interior space and a group of hydrostatic working chambers which are mounted in said housing interior space so as to be rotatable about an axis of rotation and which, as the group rotates, are connectable alternately to a high pressure and to a low pressure of the hydraulic machine and exhibit leakage into the housing interior space. A heat exchanger device is accommodated in the housing interior space. The hydraulic machine may be associated with a hydraulic assembly and a hydraulic axle.

Abstract: A hydraulic actuator includes a cylinder, a pump, an electric motor and a central block. The mechanism or the rotating parts of the pump are directly installed in an interior of the block, and the drive shaft of the pump is correspondingly mounted in walls or in covers of the block.

Abstract: A hydraulic machine includes a housing interior space and a group of hydrostatic working chambers which are mounted in said housing interior space so as to be rotatable about an axis of rotation and which, as the group rotates, are connectable alternately to a high pressure and to a low pressure of the hydraulic machine and exhibit leakage into the housing interior space. A heat exchanger device is accommodated in the housing interior space. The hydraulic machine may be associated with a hydraulic assembly and a hydraulic axle.

Abstract: A hydraulic actuator includes a cylinder, a pump, an electric motor and a central block. The mechanism or the rotating parts of the pump are directly installed in an interior of the block, and the drive shaft of the pump is correspondingly mounted in walls or in covers of the block.

Abstract: In practical application, it often happens that a large number of motion sensors and control mechanisms is required in order to carry out controlled movements, e.g., of welding tongs. The object of the present invention is to provide a solution for controlling the movement of a pair of welding tongs in the most efficient and economical manner possible with a minimum of electrical and mechanical expenditure. This object is attained by the present invention by using mechanical displacement-limiting means that limit a swiveling motion if it should occur. The advantage is the robust design and elimination of electronics and sensor systems, which are susceptible to interference.