A sealed refrigerant compressor (10A) accommodates an electric component (20A) and a compression component (30) in a sealed container (11). A crankshaft (40) included in the compression component (30) includes a main shaft part (41) and an eccentric shaft part (42). A main shaft part (41) is secured to a rotor (22A) of the electric component (20A). The rotor (22A) is provided with a balance adjustment means such as a balance hole (27), which adjusts an unbalanced load caused by the structure of the main shaft part (41).

A connecting device includes a substantially cylindrical or tubular body provided, at one of its ends, with an outer perimeter projection and co-operative with a duct of channel of a cylinder cap. The device is preferably producible with steel aluminum alloy, or another metal alloy with similar structural and thermal properties mainly due to the stresses it may suffer during use. The device is configured to be able to absorb tolerance variations and to have a resilience capable of providing resistance at the time when a connection undergoes mechanical stresses of performance, especially torsion.

A power end assembly includes a crankshaft section, a crosshead section, and a connector section coupled together by one, two, or more sets of stay rods. The power end may include one or more support plates that are coupled to the crankshaft section and/or crosshead section. The crosshead section includes a plurality of individual crosshead frames. The connector section may include a plurality of individual connector plates or may be a unitary connector plate. The power end is configured to be coupled to a fluid end assembly by coupling the fluid end assembly to the connector plates.

A piston is described for the compression of a pneumatic fluid in a compression chamber of a cylinder comprising: a cylindrically shaped piston body, adapted to be arranged slidably within said cylinder, and having a side wall and a top wall; along a circumferential perimeter of said side wall of the piston body a seat being defined; and a sealing assembly accommodated in said seat, and adapted to ensure the fluid-tightness along said circumferential perimeter; the sealing assembly comprising a plurality of sealing elements, having shapes complementary to one another, and configured so that the wear of a sealing element along said circumferential perimeter corresponds to a sliding in the radially outer direction of the adjacent sealing element.

PROBLEM TO BE SOLVED To improve controllability of a motor including a stator with two-split structure.

SOLUTION
A motor 400 includes a stator 460 disposed to surround an outer circumference of a rotor 440 which rotates integrally with a drive shaft 420. The stator 460 includes an inner core 462 having multiple protrusions 462B radially outwardly extending from an outer circumferential surface of a cylindrical portion 462A, and a cylindrical outer core 464 having its inner circumferential surface side attached to a top of the protrusion 462B. A connection portion (first connection portion 462F) as a part for connecting a side surface (first side surface 462D) of the protrusion 462B at an upstream side in a rotating direction of the rotor 440 and an outer circumferential surface of the cylindrical portion 462A has a rounded shape. A connection portion (second connection portion 462G) as a part for connecting a side surface (second side surface 462E) of the protrusion 462B at a downstream side in the rotating direction of the rotor 440 and the outer circumferential surface of the cylindrical portion 462A has a rounded shape. A radius r1 of the rounded shape of the first connection portion 462F is greater than a radius r2 of the rounded shape of the second connection portion 462G.

A housing structure for a device to be mounted on a vehicle is provided with which strength for withstanding a collision can be ensured. An electric compressor (1), which is a device to be mounted on a vehicle, is equipped with a device main body (10), and a cylindrical housing (13) provided in a vehicle and on the inside of which the device main body (10) is accommodated. A protruding portion (20) protruding radially outward is formed on a cylindrical part (15) constituting the housing (13). A cross section of the protruding portion (20) orthogonal to an axial line (15L) of the cylindrical part (15) presents an arc-like shape or a substantially arc-like shape protruding outward in the radial direction.

This air pump device is provided with: an electric pump unit including a pump mechanism and a motor; a case; and a vibration-proof member. The pump mechanism and the motor are arranged side by side in the axial direction of the motor. The pump mechanism has an inlet and an outlet at an end in the axial direction on the opposite side of the motor. The case has a first wall and a second wall which are located on opposite sides in the axial direction of the motor and which face the electric pump unit. The vibration-proof member is provided with: a first axial vibration-proof unit interposed between the electric pump unit and the first wall; and a second axial vibration-proof unit interposed between the electric pump unit and the second wall. The first axial vibration-proof unit covers the inlet.

This air pump device is provided with: an electric pump unit including a pump mechanism and a motor; a case; and a vibration-proof member. The pump mechanism and the motor are arranged side by side in the axial direction of the motor. The pump mechanism has an inlet and an outlet at an end in the axial direction on the opposite side of the motor. The case has a first wall and a second wall which are located on opposite sides in the axial direction of the motor and which face the electric pump unit. The vibration-proof member is provided with: a first axial vibration-proof unit interposed between the electric pump unit and the first wall; and a second axial vibration-proof unit interposed between the electric pump unit and the second wall. The first axial vibration-proof unit covers the inlet.

A compressor includes a motor, a balance weight and a partition. The motor includes a rotor having a first end surface and a second end surface. The balance weight is disposed on the first end surface or the second end surface. The partition is disposed on the first end surface or the second end surface. The rotor has a through hole extending from the first end surface to the second end surface. The partition divides, from the through hole, at least one of a front region and a rear region. The front region is located in front of a front edge of the balance weight in a rotational direction of the rotor. The rear region is located behind a rear edge of the balance weight in the rotational direction of the rotor.

A compressor is disclosed. A compressor according to the present discloser includes a piston structure which has a guide member reciprocating inside a cylinder in an axial direction, and a magnet frame which supports a mover moving together with the piston structure, in which the piston structure includes the guide member, a mount member connected to the magnet frame, and an elastic member provided between the guide member and the mount member and capable of elastic deformation.