# US 5,700,135 A · Bellows cam plate pump

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- Number: US 5,700,135 A
- Document ID: US5700135A
- Status: Granted
- Kind: A
- Application number: 08/598,580
- Filed: 1996-02-12
- Granted: 1997-12-23
- Earliest claimed: 1995-02-24
- Assignees: Nissan Motor Co., Ltd.
- Inventors: Iwane Inokuchi; Shigeru Kamegaya; Toshikazu Oshidari; Atsuhiro Sakamoto
- Web page: https://patentgrep.com/patent/US5700135A

## CPC

- F04B 43/086: {with two or more tubular flexible members in parallel (F04B43/1136 takes precedence)}
- F02M 59/04: characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft {or swash-plate type pumps (with rotary valve F02M59/362)}
- F02M 59/14: of elastic-wall type
- F02M 69/02: Pumps peculiar thereto {(elastic wall type pumps F02M59/14)}
- F04B 1/14: having stationary cylinders
- F04B 1/146: Swash plates; Actuating elements
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A cam plate pump comprises a pressurizing chamber formed by a bellows which elongates and contracts along a center axis parallel to the input shaft of the pump. The cam plate rotates together with the input shaft, and compresses the bellows via a piston. A mechanism for guiding the piston along the center axis, and a mechanism for blocking the rotational torque acting on the bellows via the piston are provided. These mechanisms prevent a bending load or twisting load from acting on the bellows.

## Claims

### Claim 1

A bellows cam plate pump comprising
an input shaft,
a pressurizing chamber formed by a bellows that elongates and contracts along a center axis parallel to said input shaft,
a cam plate fixed at an inclination to said input shaft,
an inlet port for supplying fluid to said pressurizing chamber according to an expansion of said chamber,
an outlet port for discharging fluid from said pressurizing chamber according to a contraction of said chamber,
a piston for compressing said bellows by a displacement according to a rotation of said cam plate, said piston including a depression for accommodating one end of said bellows, and
a cylindrical means displaced substantially coaxial with said bellows for guiding the displacement of said bellows along the center axis of said bellows.

### Claim 2 (depends on 1)

A bellows cam plate pump as defined in claim 1, further comprising an auxiliary plate which is in contact with the piston, a member which rolls between said auxiliary plate and said cam plate such that said auxiliary plate is free to rotate relative to said cam plate, and means for preventing rotation of the auxiliary plate.

### Claim 3 (depends on 1)

A bellows cam plate pump as defined in claim 1, wherein said depression has such dimensions that said depression accommodates the end of said bellows with a clearance.

### Claim 4 (depends on 3)

A bellows cam plate pump as defined in claim 3, wherein said depression has a plane at right angles to said center axis, and said bellows comes in contact with said piston in said plane.

### Claim 5 (depends on 4)

A bellows cam plate pump as defined in claim 4, wherein the bellows is connected to a member having a spherical surface which comes in contact with said plane.

### Claim 6 (depends on 4)

A bellows cam plate pump as defined in claim 4, wherein the bellows is connected to a member having a projection which comes in contact with said plane.

### Claim 7 (depends on 1)

A bellows cam plate pump as defined in claim 1, wherein said piston contacts said cam plate.

### Claim 8 (depends on 7)

A bellows cam plate pump as defined in claim 7, wherein said cylindrical means guides said piston such that said piston is free to slide along said center axis.

### Claim 9 (depends on 8)

A bellows cam plate pump as defined in claim 8, wherein said depression has a plane at right angles to said center axis, and said bellows is connected to a member having a spherical surface which comes in contact with said plane.

### Claim 10 (depends on 8)

A bellows cam plate pump as defined in claim 8, wherein said depression has a plane at right angles to said center axis, and said bellows is connected to a member having a projection which comes in contact with said plane.

### Claim 11 (depends on 8)

A bellows cam plate pump as defined in claim 8, wherein said depression is formed with such dimensions that said depression accommodates one end of said bellows with a clearance.

### Claim 12 (depends on 1)

A bellows cam plate pump as defined in claim 1, wherein the piston has a spherical surface which comes in contact with the cam plate.