# US 10,119,538 B2 · Reciprocating pump

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,119,538 B2
- Document ID: US10119538B2
- Status: Granted
- Kind: B2
- Application number: 15/248,728
- Filed: 2016-08-26
- Published: 2017-03-02
- Granted: 2018-11-06
- Earliest claimed: 2015-08-26
- Assignees: Maruyama Mfg. Co., Inc.
- Applicants: Maruyama Mfg. Co., Inc.
- Inventors: Takayuki Kaneko; Nobuhiro Yuhashi
- Web page: https://patentgrep.com/patent/US10119538B2

## CPC

- F04B 53/18: Lubricating
- F04B 1/00: Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (machines or pumps with pistons coacting within one cylinder F04B3/00)
- F04B 1/0404: Details or component parts
- F04B 9/02: the means being mechanical
- F04B 53/08: Cooling; Heating; Preventing freezing
- F04B 53/16: Casings; Cylinders; Cylinder liners or heads; Fluid connections
- 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)

## Abstract

In a reciprocating pump which performs a pumping action by causing a reciprocating member to reciprocate as a driving part including a driving shaft accommodated in a driving part case is driven, a portion of the driving part is immersed in a lubricating oil in the driving part case, and one or more ribs are provided on an upper part of an inner wall forming the driving part case so as to be directed inward.

## Claims

### Claim 1

A reciprocating pump which performs a pumping action by causing a reciprocating member to reciprocate as a driving part including a driving shaft accommodated in a driving part case is driven, a portion of the driving part being immersed in a lubricating oil in the driving part case, the driving part case including an inner wall which has an upper part positioned above the lubricating oil, the reciprocating pump comprising:
one or more ribs which are provided on the upper part of the inner wall of the driving part case so as to be directed inward,
wherein at least one of the ribs is disposed directly above the driving shaft.

### Claim 2 (depends on 1)

The reciprocating pump according to claim 1,
wherein a sectional shape of the inner wall of the driving part case perpendicular to an axis of the driving shaft is an elliptical shape.

### Claim 3 (depends on 1)

The reciprocating pump according to claim 1,
wherein at least one of the ribs is directed inward toward a center axis of the driving shaft.

### Claim 4

A reciprocating pump comprising:
a reciprocating member configured to reciprocate as a driving part including a driving shaft is driven, to cause a pump action,
a driving part case accommodating the driving shaft, the driving part case including an inner wall which has an upper part positioned above a center axis of the driving shaft,
first and second ribs which are provided on the upper part of the inner wall of the driving part case so as to be directed inward, the first and second ribs being disposed at different positions in a circumferential direction of the inner wall.

### Claim 5 (depends on 4)

The reciprocating pump according to claim 4,
wherein the first rib is disposed directly above the driving shaft.

### Claim 6 (depends on 4)

The reciprocating pump according to claim 4,
wherein the first rib is directed inward toward the center axis of the driving shaft.

### Claim 7 (depends on 4)

The reciprocating pump according to claim 4,
wherein the second rib is disposed obliquely above the driving shaft.

### Claim 8 (depends on 7)

The reciprocating pump according to claim 7,
wherein the second rib is directed inward toward the center axis of the driving shaft.

### Claim 9

A reciprocating pump comprising:
a reciprocating member configured to reciprocate as a driving part including a driving shaft is driven, to cause a pump action,
a driving part case accommodating the driving shaft, the driving part case including an inner wall,
a plurality of ribs which are disposed at different positions in a circumferential direction of the inner wall, the ribs being provided on the inner wall of the driving part case so as to be directed inward toward a center axis of the driving shaft.

### Claim 10 (depends on 9)

The reciprocating pump according to claim 9,
wherein at least one of the ribs is disposed directly above the driving shaft.

### Claim 11 (depends on 9)

The reciprocating pump according to claim 9,
wherein at least one of the ribs is disposed obliquely above the driving shaft.