US4677722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tapered piston pin
Assignee: Chrysler Motors Corp
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Filing: 1985-12-16
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Granted: 1987-07-07
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Expires: 2005-12-16
Abstract
Abstract A tubular piston pin for an internal combustion engine being of lightweight and high strength design with a cylindrical exterior surface and a double hourglass shaped aperture defined by thin-walled end portions; a thin-walled intermediate portion and two thicker-walled portions therebetween. A method for easy and inexpensive piston pin manufacture includes: the formation of half pins by molding a metal slug between two dies each having tapered end portions, punching out a midportion or intermediate web or wall to form an aperture therethrough with a generally hourglass shape, and aligning and joining two half pins axially together to form a piston pin with the double hourglass shaped interior aperture.
Inventors
- 👤 Eric D. Emmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:52
CPC Classifications
B; B23; B23P; B23P15/00; F; F16; F16J; F16J1/00; F16J1/10; F16J1/14; F16J1/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49256
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A method of manufacturing a tubular piston pin having a cylindrical exterior surface and a contoured interior surface in the form of a double hourglass shaped aperture extending axially therethrough and characterized by opposite thin-walled end portions and midportion and by thicker-walled portions therebetween, comprising these steps: supporting a metal cylinder in a cylindrical bore of a rigid housing, both having equal diameters; molding the metal cylinder by moving a pair of dies in opposite directions each against an opposite end face of the metal cylinder to produce a substantially tubular half pin with thin-walled end portions and a thicker-walled midportion including a radially extending wall thereacross; striking out the radially extending wall of the half pin to produce a continuous aperture axially through the half pin and having a substantially hourglass shape; axially aligning two half pins and integrally joining the abutting ends thereof to produce a piston pin of twice the length of the half pin having a double hourglass configured aperture extending axially therethrough.
Claim 2
Independent Claim
167 words
A method of manufacturing a tubular piston pin having a cylindrical exterior surface and a contoured interior surface in the form of a double hourglass shaped aperture extending axially therethrough and characterized by opposite thin-walled end portions and midportion and by thicker-walled portions therebetween, comprising these steps: supporting a metal cylinder in a cylindrical bore of a rigid housing, both having equal diameters; molding the metal cylinder by moving a pair of dies in opposite directions each against an opposite end face of the metal cylinder to produce a substantially tubular half pin with thin-walled end portions and a thicker-walled midportion including a radially extending wall thereacross; striking out the radially extending wall of the half pin to produce a continuous aperture axially through the half pin and having a substantially hourglass shape; axially aligning two half pins and integrally joining the abutting ends thereof to produce a piston pin of twice the length of the half pin having a double hourglass configured aperture extending axially therethrough.
Claim 3
Dependent Claim
21 words
The method of manufacturing the piston pin set forth in claim 1 in which the pin halves are joined by welding.
Claim 4
Dependent Claim
22 words
The method of manufacturing the piston pin set forth in claim 2 in which the weld is created by electron beam energy.
Claim 5
Dependent Claim
21 words
The method of manufacturing the piston pin set forth in claim 2 in which the weld is created by friction energy.
Claim 6
Dependent Claim
21 words
The method of manufacturing the piston pin set forth in claim 2 in which the weld is created by laser energy.
Claim 7
Dependent Claim
43 words
The method of manufacturing the piston pin set forth in claim 1 in which the end portions of the dies adapted for molding the metal cylinder have a generally tapered configuration with a relatively large diameter base and a progressively smaller outward dimension.
Claim 8
Dependent Claim
31 words
The method of manufacturing the piston pin set forth in claim 1 including a final step of grinding the external cylindrical surface of the piston pin to remove any weld residue.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-06 | 1991-01-05 | 1991-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-06 | 1995-01-05 | 1995-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-06 | 1999-01-05 | 1999-07-07 | $7700.00 | Window Closed / Lapsed |