Provided is a gasket (30), which is used in a motor-driven compressor including an inverter housing, including a flat core of metal (31) and an elastic foamed material (32) so disposed as to cover both surfaces of the core (31), and the gasket (30) has embossed recesses and projections (33) with predetermined shapes. It is possible to enhance sealing performance to seal the inverter housing by using this gasket (30). A motor-driven compressor using this gasket (30) enhances vibration prevention.

A mounting assembly mounts a fluid end unit to a power end unit and includes first and second end members, and a coupling. A first end of the first end member is a threaded shaft configured to be received in a mounting aperture of a power end unit. A first end of the second end member is a threaded shaft configured to be received in a mounting aperture of a fluid end unit corresponding to the mounting aperture of the power end unit. The coupling couples and extends the first end member and the second end member and may be removed therefrom without changing a relative position of the second end member to the first end member.

A mounting assembly mounts a fluid end unit to a power end unit and includes first and second end members, and a coupling. A first end of the first end member is a threaded shaft configured to be received in a mounting aperture of a power end unit. A first end of the second end member is a threaded shaft configured to be received in a mounting aperture of a fluid end unit corresponding to the mounting aperture of the power end unit. The coupling couples and extends the first end member and the second end member and may be removed therefrom without changing a relative position of the second end member to the first end member.

In order to prevent the leakage of a gas from an internal space communicating with a compression chamber inside a cylinder in a cylinder head of a compressor, the compressor includes a suction valve pressing portion that presses a suction valve so that the suction valve provided in the internal space of the cylinder head does not slip off through a suction-side head opening, the suction valve pressing portion includes a suction valve pressing and inserting portion that is inserted into the cylinder head through the suction-side head opening, the outer peripheral surface of the suction valve pressing and inserting portion is provided with an annular suction valve pressing groove portion, a suction-side O-ring is attached into the suction valve pressing groove portion, and a suction-side backup ring that suppresses the movement of the suction-side O-ring toward the suction-side head opening is disposed at a position near the suction-side head opening of the suction-side O-ring inside the suction valve pressing groove portion.

In order to prevent the leakage of a gas from an internal space communicating with a compression chamber inside a cylinder in a cylinder head of a compressor, the compressor includes a suction valve pressing portion that presses a suction valve so that the suction valve provided in the internal space of the cylinder head does not slip off through a suction-side head opening, the suction valve pressing portion includes a suction valve pressing and inserting portion that is inserted into the cylinder head through the suction-side head opening, the outer peripheral surface of the suction valve pressing and inserting portion is provided with an annular suction valve pressing groove portion, a suction-side O-ring is attached into the suction valve pressing groove portion, and a suction-side backup ring that suppresses the movement of the suction-side O-ring toward the suction-side head opening is disposed at a position near the suction-side head opening of the suction-side O-ring inside the suction valve pressing groove portion.

In the two-cylinder hermetic compressor, a first compression mechanism unit includes a first cylinder and a first piston, and a second compression mechanism unit includes a second cylinder and a second piston. A main bearing is disposed on one surface of the first cylinder, and an intermediate plate is disposed on another surface of the first cylinder. The intermediate plate is disposed on one surface of the second cylinder, and an auxiliary bearing is disposed on another surface of the second cylinder. A shaft is constituted by a main shaft portion which has a rotor attached thereto and is supported by the main bearing, a first eccentric portion having a first piston attached thereto, a second eccentric portion having a second piston attached thereto, and an auxiliary shaft portion supported by the auxiliary bearing. The diameter of the auxiliary shaft portion is set larger than the diameter of the main shaft portion.

In one aspect, a fluid end portion of a reciprocating pump assembly includes a fluid end block and an inlet manifold connected thereto. The manifold includes an opening formed therethrough and including a slot portion to facilitate the connection between the inlet manifold and the fluid end block. In another aspect, a method of connecting an inlet manifold to a fluid end block includes inserting fasteners into respective openings in the fluid end block, and effecting relative movement between the inlet manifold and the fluid end block so that the fasteners pass within respective slot portions formed through a mounting plate of the inlet manifold. In yet another aspect, a manifold is adapted to be connected to a fluid end block and includes an elongated member and a mounting plate connected thereto. The mounting plate includes openings formed therethrough, the openings including respective slot portions spaced in a parallel relation.

In one aspect, a fluid end portion of a reciprocating pump assembly includes a fluid end block and an inlet manifold connected thereto. The manifold includes an opening formed therethrough and including a slot portion to facilitate the connection between the inlet manifold and the fluid end block. In another aspect, a method of connecting an inlet manifold to a fluid end block includes inserting fasteners into respective openings in the fluid end block, and effecting relative movement between the inlet manifold and the fluid end block so that the fasteners pass within respective slot portions formed through a mounting plate of the inlet manifold. In yet another aspect, a manifold is adapted to be connected to a fluid end block and includes an elongated member and a mounting plate connected thereto. The mounting plate includes openings formed therethrough, the openings including respective slot portions spaced in a parallel relation.

An apparatus comprising a stator and a rotor which are arranged inside a housing extending along a common longitudinal axis, wherein the stator encloses the rotor in a radial direction. A space is formed between an inside of a wall of the housing and an outside of a wall of the stator. The housing has a first housing element and a second housing element that are arranged with their contact surfaces aligned with each other thus sealing the housing. Thereby, a sealing element is arranged between the contact surfaces of the housing elements. The sealing element has the shape of an annular disc with a circumferential form and at least one sealing area. In the circumferential direction, the form corresponds to a contour of the contact surfaces. The sealing area is designed to at least partially enclose the space.

During a pressurization stroke of a high-pressure pump, a cylinder inner wall and a plunger receive a fuel pressure from the pressurization chamber. Meanwhile, an upper housing does not receive the fuel pressure from the pressurization chamber, so that its thickness can be made thin. A cylinder is comprised of a bottom portion, a cylindrical portion and a large-diameter cylindrical portion. When inserting the large-diameter cylindrical portion into a large engaging hole, the bottom portion and the cylindrical portion are not brought into contact with a lower housing. A high liquid-tightness between the bottom portion, the cylindrical portion and a small engaging hole can be ensured.