Zf Batavia L.l.c.

Michael Herrmann

Wolfgang Rapp

Manfred Fischer

The link belt for power transmission for a continuously variable transmission, with individual links ( ) and a ring package ( ), which holds the links ( ) together, contains an additional, outer ring package ( ) for the purpose of absorbing the radial forces generated on the links ( ) is provided, which is arranged around the link belt ( ) and is mounted such that it can no longer rotate along with the link belt ( ), however is still able to follow the strip's adjusting movement, wherein the ring package ( ) ensures that the links are guided and held together.

Sliding link belt

The radial piston pump possesses a pump housing in which a plurality of cylinder bores are provided having pump pistons placed therein which can be driven by a cam. Further, an arrangement is provided in each pump piston ( ) wherein the inlet or the outlet, or both the inlet as well as the outlet of the fluid in each cylinder bore, is controlled.

Radial piston pump with piston arrangement for controlling inlet/exit flow

The radial piston pump possesses a pump body with a plurality of cylinder borings for the reception of pump pistons which can be driven by a cam. The cylinder borings are closed by valve plugs in which pressure passages are provided. In the pressure passages, outlet valves are inserted which respectively possess a valve stem ( ) an end of which, proximate to the pump piston ( ), is provided with an impact plate.

Radial piston pump

The invention is based on a radial piston pump ( ) with a pump body ( ), in which pump body ( ) are placed pistons ( ), and cylinders ( ) arrayed radial to a cam ( ) and the pistons ( ) upon an inward thrust suck in fluid by means of suction side intakes ( ) and upon an outward thrust, the pistons ( ) impel fluid through pressure openings ( ) in the outer end walls ( ) of the cylinder ( ) into a plenum ( ). It is proposed, that in the base of the cylinders ( ) respectively a connection boring ( ) is made to the cam ( ), which connection boring ( ) is controlled by a relief valve ( ). Upon the exceeding of its opening pressure the relief valve ( ) opens and pressure peaks in the cylinder ( ) can be diminished by means of said connection boring. At the same time, a pressure buffer between the base of the piston ( ) and the bearing shell ( ) is formed.

The invention is based on a radial piston pump ( ) with a pump body ( ), in which pump body ( ) are placed pistons ( ), and cylinders ( ) arrayed radial to a cam ( ) and the pistons ( ) upon an inward thrust suck in fluid by means of suction side intakes ( ) and upon an outward thrust, the pistons ( ) impel fluid through pressure openings ( ) in the outer end walls ( ) of the cylinder ( ) into a plenum ( ) whereby the check valves ( ) are formed from an annular coil spring valve ( ) which cover the pressure ports ( ) and the thereto connected stress relieving corrugations ( ), and upon the exceeding of a specified threshold transport pressure, the respective pressure opening ( ) opens to the plenum ( ). The proposal is made, that a stress relieving zone ( ) of a piston-cylinder unit ( ) be connected to the pressure zone ( ) of a neighboring piston-cylinder unit ( ). Thereby pressure peaks in neighboring piston-cylinder units ( ) would be ameliorated and by a thrust of reduced magnitude of the coil spring valve ( ) of a relatively great circumferential area, the intensity of noise would be diminished.

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Lebach, Germany

Michael Herrmann