# US 5,701,930 A · Modular valve assembly

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- Number: US 5,701,930 A
- Document ID: US5701930A
- Status: Granted
- Kind: A
- Application number: 08/431,893
- Filed: 1995-05-01
- Granted: 1997-12-30
- Earliest claimed: 1995-05-01
- Inventors: Robert L. Russell
- Web page: https://patentgrep.com/patent/US5701930A

## CPC

- F01L 1/04: by means of cams, camshafts, cam discs, eccentrics or the like (F01L1/10 takes precedence)
- F01L 3/085: {Valve cages}
- Y10T 29/49412: with assembly, disassembly or composite article making
- Y10T 29/53552: Valve applying or removing
- Y10T 137/7613: Threaded into valve casing
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A pre-assembled valve mechanism for use in valve controlled internal combustion engines and the like which is constructed and arranged to be installed and removed quickly as a unitary module with minimum effort and expenditure of time; the module comprising a cylindrical housing with valve seat and exhaust port, a headed valve cooperable with the seat, a valve guide, a return spring and a valve actuating cam follower coaxially mounted in operating position with the housing.

## Claims

### Claim 1

A modular, pre-assembled valve assembly designed to be installed and removed as a unit comprising:
a generally cylindrical housing having a lateral gas port and an adjacent valve seat constructed to be removably and insertably secured completely within a mating socket formed in an external support, of an engine block;
a valve having an elongated stem and a valve head cooperable with said valve seat;
a stationary valve guide insertible into and supported on an interior wall portion within said housing to support said stem for coaxial movements therewithin;
an axially moveable cam follower slidably disposed within said housing and engageable with a valve actuating cam located externally of said housing, and
a spring extending between an interior cylindrical blind socket within said cam follower for slidably receiving a major portion of said spring therein and one end of said guide for biasing said valve head against said seat whereby, said cylindrical housing is easily inserted into and removed from said engine block mating socket along with said valve guide, said spring, said cam follower, said valve head, said valve seat and said valve stem as a single unit simultaneously.

### Claim 2

A modular, unitary valve assembly actuated by an external valve cam, comprising in combination:
an elongated generally cylindrical housing having an axially extending cylindrical interior with a frustro-conical valve seat at one end thereof;
said housing having external threads at its other end for effecting threaded assembling completely into and disassembling from a mating socket formed in an external support of an engine block;
an annular valve guide insertible into and supported on a wall portion of said interior;
a cam follower slidably mounted within said interior in axially spaced relation with said valve guide comprising a tail portion extending outwardly of said the other end of said housing for operatively engaging the external valve cam;
a spring extending between and engaging one end of said guide and an interior cylindrical blind socket within said cam follower for slidably receiving a major portion of said spring therein; and
a valve comprising a head matingly engageable with said valve seat and having an elongated stem extending coaxially through said valve guide and said spring and detachably connected with said cam follower whereby, said cylindrical housing is easily inserted into and removed from said engine block mating socket along with said valve guide, said spring, said cam follower, said valve head, said valve seat and said valve stem as a single unit simultaneously.

### Claim 3 (depends on 2)

The combination of claim 2, wherein said housing has a lateral port communicating with said interior.

### Claim 4 (depends on 2)

The combination of claim 2, wherein said follower has an internally threaded socket and the valve's stem has an externally threaded end portion connectable with said socket.

### Claim 5 (depends on 2)

The combination of claim 2 wherein said cylindrical interior of said housing comprises a pair of axial bores of different diameters extending from opposite ends of said housing to form an annular shoulder at the intersection of said bores for engageably locating said valve guide in said interior.

### Claim 6 (depends on 5)

The combination of claim 5, wherein said valve guide comprises an annulus insertibly engageable with said bores and having an external shoulder abuttable with said annular shoulder to effect a substantially gas tight seal therebetween.

### Claim 7 (depends on 6)

The combination of claim 6, wherein said external threads serve to detachably connect the assembly to an internally threaded mating bore formed in said support.

### Claim 8 (depends on 7)

The combination of claim 7, wherein said housing has an external shoulder formed adjacent said one end for abutting a mating shoulder formed internally of said interior adjacent said valve seat whereby to effect a substantially gas tight seal therebetween and limit threaded advance of said housing into said mating bore and align said lateral port with a cooperating passageway in said support.