초록 ▼

A fluid pressure device such as a hydraulic pump is provided having an improved inlet porting arrangement to permit a greater output flow rate for a given input speed. The pump is of the type including a housing defining an inlet chamber and an outlet chamber and inner and outer rotors having spaced

A fluid pressure device such as a hydraulic pump is provided having an improved inlet porting arrangement to permit a greater output flow rate for a given input speed. The pump is of the type including a housing defining an inlet chamber and an outlet chamber and inner and outer rotors having spaced apart axes of rotation defining a line of eccentricity. The teeth of the rotors interengage to define a plurality of expanding and contracting volume chambers. The housing includes an end face adjacent the rotors at which the inlet chamber defines an inlet port communicating with the expanding volume chambers. The inlet port is generally arcuate and extends circumferentially from approximately the line of eccentricity on one side of the device to the line of eccentricity on the opposite side of the device. Preferably, the inlet port includes a pair of terminal portions of reduced radial width to prevent cross-porting between the inlet port and the outlet port when one of the teeth of the outer rotor is circumferentially aligned with the terminal portion.

대표청구항 ▼

A hydraulic device comprising: a. a housing defining an inlet chamber and an outlet chamber; b. an internally-toothed member having an axis of rotation and an externally-toothed member eccentrically disposed within said internally-toothed member and having an axis of rotation, said axes of rotation

A hydraulic device comprising: a. a housing defining an inlet chamber and an outlet chamber; b. an internally-toothed member having an axis of rotation and an externally-toothed member eccentrically disposed within said internally-toothed member and having an axis of rotation, said axes of rotation being spaced apart; c. shaft means operatively connected to one of said toothed members, as each of said toothed members rotates about its respective axis of rotation; d. the teeth of said toothed members interengaging to define a plurality of expanding and contracting volume chambers; e. said housing including an end face adjacent said toothed members, said inlet chamber and said outlet chamber defining at said end face, an inlet port and an outlet port, respectively, said inlet port communicating with said expanding volume chambers and said outlet port communicating with said contracting volume chambers; f. said toothed members defining generally diametrically opposed first and second sealing points, said first sealing point separating the largest of said contracting and expanding volume chambers and said second sealing point separating the smallest of said contracting and expanding volume chambers; and g. said inlet port being generally arcuate and extending circumferentially from adjacent said first sealing point to adjacent said second sealing point, said inlet port including a first terminal portion disposed adjacent said first sealing point to remain in fluid communication with the largest of said expanding volume chambers for several degrees of rotation of said internally-toothed member and said externally-toothed member after said largest of said expanding volume chambers begins to contract, to improve the inlet flow characteristics of the device.