There is provided a free rotary fluid machine including: a main body which is provided in a hollow cylindrical shape, and has an elliptical inner circumferential surface; a rotor which is provided in the main body, and rotates about the same rotation center as the main body; tip seals which are provided at one side of the rotor so as to be in contact with the inner circumferential surface of the main body; and blades which are provided between the tip seals provided adjacent to each other, and supported by the tip seals, in which the blade has one end surface that faces the inner circumferential surface of the main body, and the other end surface that is opposite to one end surface, and centers of radii of curvature of one end surface and the other end surface are positioned at the same side. As described above, a space formed among the inner circumferential surface of the main body, the rotor, and the tip seal is sealed by the auxiliary tip seal, and as a result, it is possible to reduce friction between the tip seal and the main body and to prevent a leak of an introduced working fluid.

A high-pressure fuel pump includes a drive shaft, and a vane pump and a plunger pump which are driven by the drive shaft. The vane pump is configured to supply pre-pressurized fuel to the plunger pump. The drive shaft includes a cam configured to drive a piston rod of the plunger pump such that the plunger pump alternately executes a fuel suction stroke and a fuel discharge stroke. The drive shaft further includes a shaft portion for driving a rotor of the vane pump. The vane pump is configured such that for each fuel suction stroke of the plunger pump the vane pump provides a fuel supply cycle that is advanced by a phase angle relative to the fuel suction stroke.

A vane pump sucks the hydraulic fluid from a first inlet port and discharges it into a first outlet port and, at the same time, sucks the hydraulic fluid from a second inlet port and discharges it into a second outlet port, as a rotor having a plurality of slits housing vanes and extending in a radial manner rotates. The vane pump has a first back-pressure groove that is communicated with some of the slits to supply a back pressure from the first outlet port to the corresponding vanes and a second back-pressure groove that is communicated with other of the slits to supply a back pressure from the second outlet port to the corresponding vanes. The vanes to which the back pressure is supplied from the first back-pressure groove include the vanes in pump chambers into which the hydraulic fluid is sucked from the second inlet port.

A pump device includes a flow control valve that returns a part of working fluid discharged from a pump to the suction side, and the flow control valve includes a valve body, a first fluid pressure chamber that is provided so as to face against a first-side end surface of the valve body and that is communicated with a discharge channel, a second fluid pressure chamber that is provided so as to face against a second-side end surface of the valve body and that is communicated with the discharge channel, a biasing member that is accommodated in the second fluid pressure chamber for biasing the valve body in the valve-closing direction, and a pressure regulator that is provided in a communicating passage through which the discharge channel is communicated with the second fluid pressure chamber and that adjusts pressure in the second fluid pressure chamber.

The present invention relates to a rotary motor, comprising a plurality of vanes, wherein each of the vanes is split into two subvanes, one or more elastic members, wherein the elastic member is configured to push each of the subvanes forming a vane toward an end plate to form a seal between the subvane and the end plate; an inner rotary member housing the plurality of vanes projecting from a central rotation axis of the inner rotor; a lobe member encompassing the inner rotary member and the plurality of vanes; a plurality of chambers wherein each of the chambers is encompassed by an inner surface of the lobe member and an outer surface of the inner rotary member; and one or more end plates to enclose the plurality of vanes, the inner rotary member, the lobe member and the plurality of chambers.

A vane pump unit assembled into a housing includes a rotor; a plurality of vanes; a cam ring; a first plate; a second plate; a connecting bar that has a first end portion fixed to the first plate, and a second end portion which protrudes from the second plate; and a clip that prevents the second plate and the cam ring from slipping out of the connecting bar. Before the clip is assembled into the housing, the retaining of the clip is positioned at least either between the first plate and the cam ring or between the second plate and the cam ring, in a place where a gap is formed. After the clip is assembled into the housing, the housing interposes the first plate, the cam ring, and the second plate in the axial direction, and the first and second plates are in close contact with the cam ring.

A positive-displacement unitary pump and turbine is operable as a fluid energy exchanger using a charging fluid as motive force and acting upon a separate feed fluid that exits the turbine at an elevated energy state. The rotor casing defines a rotor chamber having a contoured wall that forms a plurality of lobes, typically in an even number. Each lobe has an inlet port and an outlet port defined by the contoured wall, and the rotor has a plurality of vanes that follow the contoured wall as the rotor spins. The rotor is driven by the charging fluid entering first and second lobes, located generally opposite one another, and exiting the lobes at a lower energy state. The driven rotor is operable to elevate the energy level of a feed fluid in third and fourth lobes, located generally opposite one another.

A vane pump that includes a first communication passage that extends along an outer periphery of the cam ring and that guides a fluid that has not flowed into the first suction port from the first inflow passage to the second suction port; a second communication passage that extends along the outer periphery of the cam ring on an opposite side of the first communication passage with respect to the rotor and that guides a fluid that has not flowed into the second suction port from the second inflow passage to the first suction port; and a rectifying portion that guides the fluid from the second inflow passage so that the fluid flows into the second suction port along the outer periphery of the cam ring.

A vane pump having an electric drive unit with a drive shaft, a pump chamber, a rotor arranged in the pump chamber so as to rotate about a rotational axis, and a driver that has at least one driver pin and is connected in a rotationally fixed manner to the drive shaft, wherein, in an operating state of the vane pump, the driver pin, by way of a contact surface of the driver pin designed as a section of a lateral surface, engages in a torque-transmitting manner with a contact surface of the rotor delimiting a rotor recess designed to correspond to the driver pin. In order to improve a vane pump, it is proposed that the contact surface of the rotor is designed and arranged in such a manner that the rotational axis lies in the contact surface when this contact surface is hypothetically extended toward the rotational axis.

A bead gasket for sealing off a gap between a first component and a second component, the bead gasket including: a first gasket layer including a holding element; a second gasket layer comprising a complementary holding element; and one or more folding portions which connect(s) the first gasket layer and the second gasket layer, wherein the first gasket layer, the second gasket layer and the respective folding portion are formed in one piece, and the gasket layers are or can be folded one onto the other by folding over the respective folding portion, such that they face each other in an axial direction, and wherein the holding element and the complementary holding element are in or can be moved into a holding engagement with each other based on a positive fit and/or frictional fit, in order to secure the gasket layers against diverging from each other.