Danfoss A/s

Sauer Danfoss Aps

Danfoss Fluid Power A/s

Sauer-danfoss (nordborg)

Danvoss A/s

Hans Christian Petersen

Svend Erik Thomsen

Erik Kyster

Claus J Johansen

Tom Tychsen

Erik Haugaard

Gunnar Lysho Hansen

Lars Martensen

Palle Olsen

Ove Thorboel Hansen

Joergen Pedersen

Jorgen Pedersen

Soren N Sorensen

Carl O Flagstad

Finn Lyhne

Hans L Hansen

The invention specifies a hydraulic vane-type machine () having a stator () and having a rotor () which has multiple vanes (), each of which vanes is radially displaceable in a guide () in the rotor (), bears against an inner circumference () of the stator (), and, together with the rotor (), the stator () and in each case one side wall () at each axial end of the rotor (), delimits working chambers whose volumes vary in the event of a rotation of the rotor () relative to the stator (). It is sought to obtain a certain degree of freedom for the design of the inner circumference. For this purpose, it is provided that each vane () has, on its radially inner side, an abutment surface () which bears radially at the outside against a cam disk ().

Hydraulic vane-type 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

A hydraulic machine has a gear wheel () with outwardly extending teeth and a gear ring () with inwardly extending teeth formed by rollers each of which is supported in a pocket () in the gear ring, and pressurized spaces are formed between the gear wheel and the inwardly extending teeth. To keep the wear of the machine small, each pocket () has at least two different radii (R, R, Rn) whereby a radius (R, Rn) at a smaller displacement from the edge () of the pocket is larger than a radius (R) at a larger displacement from the same edge () of the pocket ().

Hydraulic machine

A hydraulic machine has a gear wheel () with outwardly extending teeth and a gear ring () with inwardly extending teeth formed by rollers each of which is supported in a pocket () in the gear ring, and pressurized spaces are formed between the gear wheel and the inwardly extending teeth. To keep the wear of the machine small each pocket () has at least two different radii (R, R, Rn) whereby a radius (R, Rn) at a smaller displacement from the edge () of the pocket is larger than a radius (R) at a larger displacement from the same edge () of the pocket ().

A rotary fluid pressure device has a first oil passage with relatively high pressure fluid therein surrounding the gear set; a plurality of second oil passageways connecting the first oil passageway to the expanding and contracting oil chambers; and fluid non-return valves in each of the second oil passageways to permit the flow of oil therethrough only in a direction from the oil chambers to the first oil passageway.

Transition valving by means of non-return valves

A rotary fluid pressure device has a first oil passage with relatively high pressure fluid therein surrounding the gear set; a plurality of second oil passageways connecting the first oil passageway to the expanding and contracting oil chambers; and fluid non-return valves in each of the second oil passageways to permit the flow of oil therethrough only in a direction to the oil chambers from the first oil passageway to the oil chambers.

A valve member includes an axially movable spool valve rotatably mounted in the valve member to cause the way that fluid is communicated between the inlet and outlet ports of the device and the volume chambers thereof. An outer surface of the spool has a configuration to react to fluid pressure to effect the timing between the gear set and the valving of valve member and that the timing therebetween will be adjusted when the spool valve is moved axially. A valve actuator comprising a spring loaded plunger controlled by fluid pressure at the inlet and outlet ports is in physical contact with one end of the valve spool.

Functionalties of axially movable spool valve

Rotation connection for connecting unaligned machine elements

A hydraulic machine with an orbiting displacement element connected unrotatably with an output shaft via an intermediary shaft, the intermediary shaft having at least at one end an external toothing, which engages an internal toothing, which permits a swivel motion of the intermediary shaft. The external toothing has teeth with concavely shaped tooth sides having a smaller curvature at the axial ends than in the area of the axial center.

Hydraulic machine comprising a gearwheel and annual gear having trochoid

Hydraulic machine and method of producing the contour of a gearwheel of

Hydraulic machine having teeth formed by rollers

The control arrangement may be used for vehicles or in other steering systems and includes a steering motor that is adjusted as a function of hand operated steering mechanism, the steering mechanism controlling a directional section and a metering motor section. The directional section is fluidly connected between the steering motor and both of a tank and the metering motor section. A pump is connected between a tank and the metering motor section. The one sides of electromagnetic plus and negative valves are fluidly connected between the fluid connection of the metering motor section and the directional section while the opposite sides are respectively connected to the connection of the pump and the metering motor section and the connection of the directional section to the tank. A processing device for controlling the valves is provided for sensing the steering angle error. The control arrangement provides a simple structural arrangement to compensate for leakage.

Control arrangement for a fully-hydraulic steering system

A gear wheel assembly of the type having an externally toothed gear wheel and an internally toothed ring wheel with the gear wheel having one less tooth than the ring wheel and the wheels having eccentrically spaced axes with said gear wheel being rotatable about the gear wheel axis which in turn is orbitable about the ring wheel axis. Each tooth of the gear wheel has a flank on each side of the tip thereof with each said flank having a shallow recess formed thereon. Each such recess has three successive curved sections with each such recess starting and ending with the same tangent as the respective adjacent part of the associated flank. With this gear construction an automatic braking action is generated in the absence of hydraulic pressure.

Growing community of inventors

Nordborg, Denmark

Hans Christian Petersen