The present invention relates a scroll compressor. According to an exemplary embodiment of the present invention, the scroll compressor includes: an orbiting scroll configured to be seated on one surface of a main frame and provided with a plurality of seating grooves along a circumferential direction; a stepped part configured to be formed in the seating groove; a ring member configured to be inserted into the seating groove and have a lower surface adhering to the stepped part; and a guide pin configured to have one end fixed to the main frame and the other end extended in an inside length of the ring member, in which the guide pin has the end maintained in a spaced state from the stepped part.

A supercharger constructed in accordance to one example of the present disclosure includes a housing, a first rotor, a second rotor and a rotor shaft assembly. The first and second rotors are received in cylindrical overlapping chambers of the housing. The first rotor has a central longitudinal passage. The rotor shaft assembly rotatably supports the first rotor and includes a first rotor shaft and a separate and distinct second rotor shaft. The first and second rotor shafts are press-fit into the central passage defined in the first rotor.

The present invention relates to a rotor for a vacuum pump 150 having a roots pumping mechanism, the rotor comprising at least two hollow lobes 160, 162, 164, 166, each lobe having an outer wall 208 which defines a lobe profile, a hollow cavity 210 generally inward of the outer wall, and at least one strengthening rib 226 located in the cavity to resist stress on the lobes generated during rotation.

A compressor is provided and may include a shell, a hub, an insert, and at least one collar. The hub may be disposed within the shell and define an axis of rotation. The hub may include an axially extending aperture. The insert may be disposed within the aperture. The at least one collar may be disposed about the hub.

A driveshaft assembly for a compressor includes an unloader assembly and a driveshaft. The unloader assembly includes an unloader and a counterweight. The unloader assembly is rotationally supported by a bearing. The unloader includes a flank surface that is slidably engaged with a flank surface on the driveshaft.

It is intended to provide a vacuum pump so that without upsizing the vacuum pump, noise and vibration are reduced, heat dissipation property is secured, and the casing is downsized. Therefore, at least one turning part is provided in an exhausting path formed in a casing body. The casing body is formed of a material whose thermal conductivity is higher than that of a rotor and vanes, and a cylinder part where the vanes slide is press fitted in the casing body.

It is intended to provide a vacuum pump so that without upsizing the vacuum pump, noise and vibration are reduced, heat dissipation property is secured, and the casing is downsized. Therefore, at least one turning part is provided in an exhausting path formed in a casing body. The casing body is formed of a material whose thermal conductivity is higher than that of a rotor and vanes, and a cylinder part where the vanes slide is press fitted in the casing body.

A pump shaft (10; 12) and a pump member (16; 18) mountable on the shaft for rotation with the shaft have respective contact surfaces that contact when the pump member is mounted on the shaft. At least one of the contact surfaces is formed such that corrosion products of the surface are substantially incompatible with the other contact surface so that joining of the shaft and pump member at the contact surfaces by corrosion is substantially prevented. The pump shaft and pump member may be parts of a dry pump.

A compressor including a shell; a first scroll and a second scroll positioned in the shell, the first scroll having a first end plate and a first wrap extending from the first end plate toward the second scroll, the second scroll having a second end plate and a second wrap extending from the second end plate toward the first scroll, the first wrap and the second wrap being engaged with each other to define a compression chamber therebetween, the second end plate of the second scroll further having a mounting hub portion extending in a direction away from the first scroll; a driving mechanism positioned on a side of the second scroll away from the first scroll in the shell and configured for driving the first scroll to rotate about a first rotation center, such that the first scroll drives the second scroll to rotate about a second rotation center; and a shaft positioned in the shell and fixedly mounted in the compressor, one end of the shaft being provided with a first hole in which the mounting hub portion is accommodated.

A compressor includes a housing, a motor disposed in the housing, a driving shaft connected to the motor, a first compression mechanism connected to the driving shaft, and a second compression mechanism. The second compression mechanism includes a stationary scroll and an orbiting scroll engaged with each other, a bushing seat positioned at an end portion of the driving shaft, a bushing, and a bearing. A main axis of the driving shaft passes through a positioning protrusion of the bushing seat, and the positioning protrusion is deflected at an angle relative to a straight line connected by a plurality of contact points between the orbiting scroll and the stationary scroll. The bushing is sleeved on the positioning protrusion, and a center line of the bushing is eccentric to the main axis. The bearing is sleeved on the bushing, and the orbiting scroll is sleeved on the bearing.