Danfoss A/s

Ove Thorboel Hansen

Lars Martensen

Palle Olsen

Hans Christian Petersen

Erik Haugaard

Hardy Peter Jepsen

Henry M Moeller

The invention concerns a hydraulic piston machine, in particular a water hydraulic machine, with at least one cylinder, in which a piston () is arranged to reciprocate, the piston () comprising a hollow that is surrounded by an annular wall and has one open end. It is endeavored to keep cavitations small. For this purpose, a filling member () is arranged in the hollow (), the filling member () having at least a radial projection () and the annular wall () having at least a radial depression () in the inside facing the hollow (), or the annular wall () having a radial projection and the filing member () having a radial depression, the depression having a restraint (), at least at the end adjacent to the open end () of the hollow (), and the projection () and the depression () engaging each other.

Hydraulic piston machine, in particular water hydraulic machine

The invention concerns a vane cell machine with a stator and a rotor having radially displaceable vanes arranged in guides, said vanes bearing on an inside of the stator and bordering, together with the rotor, the stator and a side wall, work chambers at each axial end of the rotor. It is endeavored to provide a vane cell machine that has a good internal tightness, in which the wear is still kept small. For this purpose, in a radially internal area the side wall comprises an insert that is axially movable in the side wall and has a pressure application surface axially inside and axially outside.

Vane cell machine having plates containing axial moving inserts bearing against the rotor

The invention concerns a vane cell machine having a stator and a rotor that is made of a first material, the rotor having guides comprising radially displaceable vanes that rest on an inside of the stator and border work chambers at each axial end of the rotor together with the rotor, the stator and individual stationary side walls, the vanes having, at least at some contact faces with the rotor and the stator, a second material that interacts unfrictionally with the first material. It is endeavoured to keep the wear small. For this purpose, in a radially inner area, the side wall comprises a surface of a third material interacting unfrictionally with the first material and, in a radially outer area a surface made of the first material.

Vane cell machine

Motor start circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding () and an auxiliary winding (), which are supplied with current, particularly alternating current, via current supply connections (), and with a start switching device () serving the purpose of interrupting the current flow through the auxiliary winding () after the start of the motor, the start switching device () being connected to a control device () via a connector (), the control device () being connected between the current supply connections (), and with a winding protection switch (), which is normally closed and which opens on the occurrence of a fault. The invention is characterized in that the control device () is connected to the winding protection switch () via at least one further connector (), preferably via at least one further connector () and the auxiliary winding ().

Water hydraulic machine

The invention concerns a hydraulic axial piston machine () with a cylinder body (), at least one piston () to be axially displaceable in the cylinder body (), said piston () resting on a swash plate () by way of a slide shoe (), with a pressure plate () loading the slide shoe () in the direction of the swash plate (), and a hold-down part (), which bears with a contact surface () on a counter surface () of the pressure plate() facing away from the swash plate (). It is endeavored to operate the machine with as little wear as possible. For this purpose, it is ensured that the contact surface () is formed by a circumferential surface section of a cone, whose peak () is directed towards the swash plate ().

Hydraulic axial piston machine

Hydraulic piston machine

Hydraulic machine and method for assembling a piston and slider shoe unit

A hydraulic piston machine is disclosed, having a cylinder drum and a control plate, which control plate has at least one high-pressure 'kidney' and at least one low-pressure 'kidney' and also a contact surface against which the cylinder drum bears in operation, at least the contact surface being provided with a friction-reducing layer. It is desirable for such a machine to have better operational behavior and a longer service life. For that purpose, the contact surface in the region of the low-pressure kidney has a recessed region forming a gap between the cylinder drum and the control plate.

A hydraulic pumping device for use in a hydraulic machine having a piston and slider shoe unit made of a combination of plastic and metal material to operate with virtually lubricant free fluid.

Growing community of inventors

Nordborg, Denmark

Ove Thorboel Hansen