# US 5,346,363 A · Liner for a water jet propulsion pump

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

- Number: US 5,346,363 A
- Document ID: US5346363A
- Status: Granted
- Kind: A
- Application number: 08/052,168
- Filed: 1993-04-23
- Granted: 1994-09-13
- Earliest claimed: 1993-04-23
- Assignees: Outboard Jet - Trutol Bearings, Inc.
- Inventors: Richard C. Stallman; William T. Stallman
- Web page: https://patentgrep.com/patent/US5346363A

## CPC

- B63H 11/08: of rotary type
- F04D 29/4286: {inside lining, e.g. rubber}
- F02B 61/045: {for marine engines}
- B63H: MARINE PROPULSION OR STEERING (propulsion of air-cushion vehicles B60V1/14; specially adapted for submarines, other than nuclear propulsion, B63G; specially adapted for torpedoes F42B19/00)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

A liner of the intake casing for a water jet propulsion pump wherein the liner is made of a resilient material and is disposed internally of said casing surrounding the water impeller and is clamped in position by the pump assembly.

## Claims

### Claim 1

An improved liner for a water jet propulsion pump called a jet drive having a pump volute with an intake casing removably secured thereto and a water impeller disposed in said casing, said impeller having blades with peripheral ends disposed proximate to the internal wall of said casing and which sweep a truncated cone-shaped volume, said liner comprising
a resilient hollow truncated inverted cone-shaped sleeve disposed between said impeller blade peripheral ends and the internal wall of said intake casing, the outer surface of said liner shaped to conform to said internal wall of said casing, the internal surface of said liner shaped to mate in close surrounding spaced relation to said impeller blade peripheral ends, and
an integral flange extending from the external surface of said liner and formed for being sandwiched between said pump volute and said intake casing.

### Claim 2 (depends on 1)

The jet drive liner of claim 1 wherein said liner includes an extension ring which projects beyond said integral flange into said pump volute, the external surface thereof shaped to conform to the adjacent internal wall of said volute and the internal surface thereof being a continuation of the internal wall of said liner formed for mating with said impeller blade peripheral ends.