US 4,541,788 AGranted

Diaphragm fluid pump

AssigneesToyota Jidosha Kabushiki Kaisha, Aisan Kogyo Kabushiki Kaisha

InventorsYoshihisa Nomura, Shingo Watanabe, Shoichi Yamamoto

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Abstract

In a diaphragm fluid pump which includes a diaphragm piston assembly assembled within a pump housing to form a pump chamber at one side thereof, the diaphragm piston assembly includes a diaphragm member secured in a fluid-tight manner at its outer periphery to the peripheral wall of the pump housing, and an operation rod connected at one end to the diaphragm member and at another end to a swingable end of a rocker arm to reciprocate the diaphragm piston assembly in an axial direction so as to produce a positive or negative pressure in the pump chamber. A pair of axially spaced upper and lower guide assemblies are mounted within the pump housing to slidably support the operation rod in its axial direction, and a support member is mounted on a lower end portion of the operation rod and slidably supported by the lower guide assembly, the support member being provided at its upper end with a receiver portion for receiving thereon the swingable end of the rocker arm.

Claims10

Dependent claims

A diaphragm fluid pump, comprising:

a housing assembly including a lower housing section for forming a lubricating oil chamber therein and an upper housing section coupled with said lower housing section and provided thereon with inlet and exhaust ports;
a diaphragm piston assembly including a diaphragm member clamped in a fluid-tight manner at the outer periphery thereof between said housing sections to form a pump chamber in said upper housing section, and an operation rod connected at the upper end thereof with the center of said diaphragm member;
valve means assembled within said upper housing section and including a first check valve to permit fluid flow into said pump chamber through said inlet port and a second check valve to permit fluid flow discharged from said pump chamber through said exhaust port;
and
a rocker arm pivoted on a portion of said lower housing section and driven by a drive shaft to swing in a vertical direction, said rocker arm having a swingable end connected with said operation rod to reciprocate said diaphragm piston assembly in an axial direction;
said diaphragm fluid pump further comprising a pair of axially spaced upper and lower guide assemblies mounted within said lower housing section for slidably supporting said operation rod in its axial direction, and a support sleeve rotatably mounted on the lower end portion of said operation rod and slidably supported by said lower guide assembly, said support sleeve being formed with an annular flange for receiving thereon the swingable end of said rocker arm.

3 more elements

A diaphragm fluid pump comprising a housing assembly including a lower housing section for forming a lubricating oil chamber therein and an upper housing section coupled with said lower housing section and provided thereon with inlet and exhaust ports;

and a diaphragm piston assembly including a diaphragm member secured in a fluid-tight manner at the outer periphery thereof to said housing assembly to form a pump chamber in said upper housing section, and an operation rod connected at the upper end thereof with the center of said diaphragm member;
valve means assembled within said upper housing section and including a suction check valve to permit fluid flow sucked into said pump chamber through said inlet port and a discharge check valve to permit fluid flow discharged from said pump chamber through said exhaust port;
and a rocker arm pivoted on a portion of said lower housing section and driven by a drive shaft to swing in a vertical direction, said rocker arm having a swingable end connected with said operation rod to reciprocate said diaphragm piston assembly in an axial direction;
said diaphragm fluid pump further comprising a pair of axially spaced upper and lower guide assemblies mounted within said lower housing section for slidably supporting said operation rod in its axial direction;
and a flange formed in a piece with the lower portion of said operation rod and located above said lower guide assembly for receiving thereon the swingable end of said rocker arm;
wherein said lower guide assembly comprises a guide means fixedly coupled within a vertical stepped bore in a bottom portion of said lower housing section for slidably supporting the lower portion of said operation rod in its axial direction;
and
wherein said vertical stepped bore includes a large diameter part in which said guide means is coupled and a small diameter part in which the lower end of said operation rod is exposed, the small diameter part of said bore forming an oil well to store therein an amount of lubricating oil.

5 more elements

Dependencies are inferred from the claim text.