초록 ▼

A two-cylinder air compressor has a motor with a through drive shaft. Identical housings are provided at each end of a cylindrical spacer sleeve that surrounds the motor. The housings include cylinder housing extensions each of which mounts a cylinder sleeve, a valve plate and a head. The heads are

A two-cylinder air compressor has a motor with a through drive shaft. Identical housings are provided at each end of a cylindrical spacer sleeve that surrounds the motor. The housings include cylinder housing extensions each of which mounts a cylinder sleeve, a valve plate and a head. The heads are part of a one-piece cylinder head member. Wobble pistons are mounted on each end of the motor shaft and operate in the cylinder sleeves. The cylinder sleeves rest on a floor in the housing which has integrally formed passages for cooling air to circulate around the cylinder sleeves. The one-piece cylinder head member includes integral tubes connecting the heads. The integral tubes span the distance between the heads and are spaced from the outside of the spacer. The housings may be joined by through bolts or without bolts by press fitting the bearings in the housing, press fitting the housings to the spacer sleeve, and press fitting the motor shaft into the bearings. The one-piece cylinder head serves as the final retention member, clamping the housings axially while maintaining radial orientation.

대표청구항 ▼

[ We claim:] [1.]1. In a pump comprising at least two separate cylinder housings, each cylinder housing defining a cylinder with an axis, the axes being parallel and spaced apart; a pair of pistons, each piston being reciprocable in a corresponding one of the cylinders so as to reciprocate along the

[ We claim:] [1.]1. In a pump comprising at least two separate cylinder housings, each cylinder housing defining a cylinder with an axis, the axes being parallel and spaced apart; a pair of pistons, each piston being reciprocable in a corresponding one of the cylinders so as to reciprocate along the axis of the corresponding cylinder to vary a working volume of the cylinder; a motor positioned between the cylinder housings and driving the pistons so as to reciprocate the pistons; a pair of head members, each head member being fastened to a different one of the cylinder housings; and at least one tube spanning the head members, wherein the tube provides fluid communication between the head members; improvement wherein:the motor is fixed between the cylinder housings with a fastenerless connection joining the motor to the cylinder housings;a head which is common to both of the cylinder housings is rigid so as to assist securing the housings in a fixed orientation relative to one another; andsaid head is monolithically formed in a single piece of continuous material which includes the head members and the tube.