Abstract:
A scroll type apparatus for fluid displacement is disclosed. In one embodiment, the apparatus (10) includes an adjustment mechanism (88) capable of being adjusted after assembly of the apparatus to close an axial gap between scroll members (14, 42) and account for manufacturing tolerances in apparatus components. In another embodiment, the apparatus includes an orbital scroll (42) of two portions (44, 46), with a supporting portion (44) surrounding an eccentric bearing (34) of higher density than that of a scroll portion (46). The center of mass of the orbital scroll is thus moved towards the eccentric bearing to reduce torquing of the scroll as it orbits. In a further embodiment, the apparatus includes n orbital scroll (42) having two portions, a supporting portion (44) surrounding an eccentric bearing (34) having a lower coefficient of thermal expansion than that of scroll portion (46), to reduce thermal expansion of the supporting portion, reducing misalignment of the orbital scroll on the eccentric bearing.
Abstract:
A method of manufacturing a pin (roller) holding ring for a gear mechanism in which external gears (5a, 5b) are meshed internally with an internal gear (20) comprising a pin (roller) holding ring (110) having semi-circular pin (roller) holding holes in the inner peripheral side and pins (rollers) (11) close-fitted rotatably in these pin holding holes, the method comprising the steps of drilling fully circular pin holding holes (113a) in a ring base material before the inner diameter DA of a pin holding ring base material (151) is machined to a finish diameter, and expansion-machining the inner diameter of the pin holding ring up to a finish diameter after the inner surfaces of the pin holding holes have been surface-finished by a roller burnishing machining so as to provide the pin holding ring having semi-circular pin holding holes, whereby the sliding rotation of the pins in the pin holding holes can be improved.
Abstract:
A compressor has a housing assembly and at least one rotor held by the housing assembly for rotation about a rotor axis. The rotor has a first face and a first housing element has a second face in facing spaced-apart relation to the first face of the rotor. The housing has a coating on the second face and a plurality of inserts protruding from the second face into the coating.
Abstract:
The invention relates to a radial piston pump unit for a high pressure injection system with a pump housing (1) in which a driveshaft (2) with an eccentric section (3) is mounted. A reciprocating ring (4) sits on the above section and drives at least one spring-loaded piston (5) which may be displaced in a direction radial to the drive axis (2). The driveshaft (2) is embodied to comprise an end region (6) which has a floating mounting and is also the drive for a fuel supply pump (8).
Abstract:
A method for controlling the operation of a vacuum pump when stopping the gas transferring operation thereof, the vacuum pump having a housing in which a pump chamber is formed and a gas transferring body which is rotatably disposed in the pump chamber for transferring gas, the method comprises the steps of reducing rotational speed of the gas transferring body to a first preset speed below a second preset speed that is lower than a normal speed of the gas transferring body during normal gas transferring operation of the vacuum pump, maintaining the speed of the gas transferring body below the second preset speed, and stopping the rotation of the gas transferring body when the temperature of the housing reaches a predetermined temperature which is lower than that of the housing during the normal gas transferring operation of the vacuum pump.
Abstract:
The rotary piston type internal combustion engine (E1) comprises an output shaft (1), a rotor (2), a housing (4), an annular operation chamber (5) formed by the rotor and housing on at least one side of the rotor in the axial direction of the output shaft for constituting an intake operation chamber, a compression operation chamber, a combustion operation chamber, and an exhaust operation chamber, a pressuring/pressured member (6) provided to the rotor for partitioning the annular operation chamber, two operation chamber partitions (7, 8) provided to the housing for partitioning the annular operation chamber, biasing mechanisms for biasing the operation chamber partitions toward their respective advanced positions, an intake port (11), an exhaust port (12), and a fuel injector (14), wherein the pressuring/pressured member (6) is constituted by an arc-shaped partition having first and second inclined surfaces and the operation chamber partitions (7, 8) are each constituted by a reciprocating partition reciprocating in parallel to the axis of the output shaft.
Abstract:
An air cooled rotor for a rotary internal combustion engine, such as a Wankel type engine, in which the housing has a two-lobed epitrochoidal bore which forms the cavity, the rotor having an outer profile of generally equilateral triangular shape with outwardly curved sides, such as convexly curved sides, and the rotor being mounted on an eccentric journal of a main shaft and being geared to rotate in a planetary manner within the cavity at one third of the speed of rotation of the main shaft, the rotor comprising a body and an insert (22) secured together by one or more rigid fasteners (29) which extend into a passage part (27) of the insert (22) from a passage part (28) of the body which opens to the outer profile (12) of the rotor (10), the or each fastener (29) extending transverse to the axis of rotation of the rotor, at an angle of between 70° and 90° to the axis.