Wankel Gmbh

Werner Schubert

Wolfgang Sohler

Roland Nuber

Franz Sutter

Wilhelm Durach

A rotary piston internal combustion engine includes two side parts and a casing cover part with a trochoidal shaped dual-arc casing inner surfacing of a fluid-cooled housing. An eccentric shaft passes axially through the housing. A triangular piston is journalled on an eccentric of the eccentric shaft with three corners of the piston gliding along the casing inner surfacing in a continuous sliding engagement. A belt drive connects the eccentric shaft with a refrigeration compressor of the same type of construction as the internal combustion engine. A fan wheel is arranged and joined by a universal coupling joint as to a telescopic part that is nonrotatable although axially shiftable relative to a mating telescopic part connected with an output shaft of the internal combustion engine connected by a first universal coupling joint and connected by a second universal coupling joint relative to the fan wheel. The telescopic parts include a polygon cross section for the inner part and an outer part which surrounds the inner part with a corresponding polygon-cylindrical inner shape slidable in the axial direction as is necessary to take up vibration impacts between the internal combustion engine fixed in a tubular frame and the fan wheel mounted in the housing frame. A shift between cooling operation and heating operation is made possible via a vaporization valve so that cooling medium circulation can be returned to the refrigeration compressor brought to a standstill when the circulation is switched to heating operation.

Machine unit consisting of a rotary piston internal combustion engine

A piston of a rotary piston engine of trochoidal type of construction, which is radially divided and the parts of which are connected shiftable axially against each other via axial guide bolts and among each other engaging against an elastomeric or resiliently deformable sealing ring, whereby the axial seals of the piston in the sidewalls thereof are structurally fixed or stationary sealing strips. The radial edges of these sealing strips coincide or cover themselves with the contours of the piston flanks or sides and they have cuts, notches or depressions in the piston corners for the radial seals of the piston which are in alignment with the grooves thereof.

Piston of a rotary piston engine

A bearing arrangement of an external axial rotary piston blower for gaseous medium having a housing which consists of an interior runaway surface and two side parts through which shafts project upon which pistons rotating therewith form working chambers. The shafts of these pistons have ball bearings with lip flap or face seals for sealing-off of gas pressure in the working chambers as well as externally of these bearings having transmission gears journalled with respect to the side parts. Bearing necks or collars are formed and provided with the ball bearings for the shafts of the pistons and these annular grooves are open extending radially outwardly. Groove walls on the transmission side along with inner edges of the gear rings of the gears of the transmission form an annular gap of closest narrow tolerance. A further annular gap can be provided between the bores for the shafts and the bearing necks and the hubs of the gears of the transmission. The annular gaps have a width in a range of a tenth to a twentieth of a millimeter of narrowest close tolerance. An annular chamber is arranged on a side of an end plate of shaft toward the side part. A passage communicates with gap chambers between one end plate of a shaft and an adjoining side part on the one hand. A check valve communicates via a bore in the side part on the other hand.

Bearing arrangement of an external-axial rotary piston blower

A gap seal formed between surfaces cooperating with each other such that operation free of engagement between the cooperating rotor and housing parts with respect to each other at relative speeds occurs subject to a roughened light-metal surface of one part cooperating with a covering of foamed synthetic material on the other part so as to assure gap seal therebetween rather than having any metal-to-metal and/or foamed-material to foamed-material interengagement. The foamed synthetic material covering of a surface preferably is made of polyurethane and the light-metal surface is made of aluminum roughened by sandblasting or etching. The lightweight metal part can have cavities and recess spaces therein to be filled with foamed material as well as other fins, ribs, and anchoring provision for holding the foamed synthetic material bodies in place. The applicability of the cooperating surfaces of lightweight metal parts and foamed synthetic material parts includes rotary piston engines having different configuration of lobes of rotating pistons as well as cooperating surfaces of a spiral compressor and also a screw compressor for delivery of working medium free of oil and bearing grease.

Rotary piston blower with foamed synthetic material surfaces running

A bearing arrangement of an external axial rotary piston blower for gaseous medium having a housing which consists of an interior runway surface and two side parts through which shafts project upon which pistons rotating therewith form working chambers. The shafts of these pistons have ball bearings with lip, flap or face seals for sealing-off of gas pressure in the working chambers as well as externally of these bearings having transmission gears journalled with respect to the side parts. Bearing necks or collars are formed and provided with the ball bearings for the shafts of the pistons and these annular grooves are open extending radially outwardly. Groove walls on the transmission side along with inner edges of the gear rings of the gears of the transmission form an annular gap of closest narrow tolerance. A further annular gap can be provided between the bores for the shafts and the bearing necks and the hubs of the gears of the transmission. The annular gaps have a width in a range of a tenth to a twentieth of a millimeter of narrowest close tolerance. An annular chamber is arranged on a side of an end plate of shaft toward the side part. A passage communicates with gap chambers between one end plate of a shaft and an adjoining side part on the one hand. A check valve communicates via a bore in the side part on the other hand.

An external axial rotary piston blower for quarter-roller type of construction with transfer ports leading to the outlet in the casing runway surfacing or inner peripheral surface of the housing with length differing relative to each other and increasing cross section differing toward the outlet, the greatest length of which can be permitted to be dimensioned or measured only such that the transfer ports are first opened when the inlet is closed-off by the piston traversing the same.

External axial rotary piston blower with noise suppressing transfer ports

An external axial rotary piston blower having a housing including a casing part and two side parts of which the casing part encompasses a cylindrical runway surfacing which is formed by two cylinders intersecting each other in a region of an inlet and an outlet and in which two identical pistons having at least one wing portion rotate among each other, such pistons having starting surfaces with a large radius running against a casing runway surfacing and respectively another piston having a starting surface with a small radius running correspondingly against a casing runway surfacing. Shafts of the pistons are offset or shifted in cold condition in a direction of a short housing axis toward the outlet and the housing on the side of the outlet is shorter in axial direction in cold condition than on the side of the inlet.

Growing community of inventors

Lindau, Germany

Werner Schubert