Method of making a valve stem seal with formable retainer tabs

Patent metadata

Field	Value
Publication number	US-9943935-B2
Application number	US-201615093796-A
Country	US
Kind code	B2
Filing date	Apr 8, 2016
Priority date	Apr 8, 2016
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A method for making a valve stem seal, comprising the steps of providing a metal retainer having a top portion and a body portion. The body portion having a first section and a second section. In a first state, the first section of the body portion is cylindrical and the second section of the body portion is cone shaped. Providing a hollow mold. Inserting the metal retainer into the outer mold piece, inserting the inner mold piece into the metal retainer, and then securing the inner and outer mold pieces to each other. Filling a cavity around the top portion of the metal retainer with an elastomeric compound. Removing the metal retainer and the formed rubber sealing element from the mold pieces, and pressing downward over the formed valve stem seal to compress the second section of the body portion radially inwardly.

First claim

What is claimed is:

1. A method for making a valve stem seal, comprising the steps of:
providing a metal retainer comprising a top portion and a body portion, said body portion comprising a first section and a second section, wherein in a first state, said first section of said body portion is cylindrical and said second section of said body portion is cone shaped, said metal retainer top portion and body portion defining a through passageway;
providing a hollow mold cavity created from an outer mold piece and an inner mold piece, wherein said outer mold piece has a hollow interior and said inner mold piece is solid;
inserting said metal retainer into said hollow interior of said outer mold piece;

inserting said inner mold piece into said metal retainer in said hollow interior of said outer mold piece and securing said outer mold piece with said inner mold piece;
filling a first cavity around said top portion of said metal retainer with an elastomeric compound;
removing said metal retainer and a formed rubber sealing element from said mold pieces; and
pressing downward over said formed valve stem seal to compress said second section of said body portion radially inwardly, wherein in a second state said first section of said body portion is cylindrical and said second section of said body portion is cylindrical.

2. The method of making a valve stem seal according to claim 1 , wherein said top portion comprising a radially inwardly extending flange, an inner diameter of said radially inwardly extending flange is less than an inner diameter of said first section of said body portion.

3. The method of making a valve stem seal according to claim 1 , wherein said top portion is flush with a top of said formed rubber sealing element, an inner diameter of said top portion is equal to an inner diameter of said first section of said body portion.

4. The method of making a valve stem seal according to claim 1 , wherein said second section of said body portion comprising vertical tabs, said vertical tabs are equidistance from one another and are formable so that they may be moved during or after the molding process.

5. The method of making a valve stem seal according to claim 4 , wherein each of said vertical tabs comprising an inwardly extending flange.

6. The method of making a valve stem seal according to claim 1 , wherein in said second state, said first section of said body portion and second section of said body portion are parallel to and in alignment with one another.

7. The method of making a valve stem seal according to claim 6 , wherein an inner diameter of said first section of said body portion is substantially equal to an inner diameter of said second section of said body portion.

8. The method of making a valve stem seal according to claim 1 , wherein in said second state, an inner diameter of said first section of said body portion is greater than an inner diameter of said second section of said body portion.

9. The method of making a valve stem sealing according to claim 1 , wherein said top portion may be horizontally molded into the side of said formed rubber sealing element.

10. The method of making a valve stem sealing according to claim 1 , wherein an inner surface of said top portion contacts an exterior surface of said rubber sealing element.

Assignees

• Dana Automotive Systems Group

Inventors

• Mcarthy Troy D

Classifications

• F16J15/3276

  with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted · CPC title

• F16J15/3252

  with rigid casings or supports · CPC title

• B29L2031/26

  Sealing devices, e.g. packaging for pistons or pipe joints · CPC title

• B29K2905/00

  Use of metals, their alloys or their compounds, as mould material · CPC title

• B29K2021/00

  Use of unspecified rubbers as moulding material · CPC title