Patent US6439187B1 successfully refreshed from Google Patents.
US6439187B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical compression release
Assignee: Certified Parts Corp
•
Filing: 2000-11-10
•
Granted: 2002-08-27
•
Expires: 2020-11-10
Abstract
Abstract A compression release mechanism for an internal combustion engine wherein a rotatable pin positioned axially parallel to the camshaft is rotatably received in the cams, and has a lift member mounted at an axial end thereof. The pin is non-cylindrically shaped at one axial end thereof, and the non-cylindrically shaped end is received and secured into a correspondingly shaped bore disposed in a cylindrical hub extending perpendicularly from a one-piece flyweight. An optional adhesive can be used to secure the pin to the hub of the flyweight. According to a further optional embodiment, the hub can be crimped so as to engage the release pin. The disclosed configuration ensures a secure engagement and therefore avoids slipping between the release pin and the flyweight. Further, the design facilitates easy alignment of the pin with the flyweight during assembly. The flyweight can be a one-piece integral structure.
Inventors
- 👤 James R. Dietz
- 👤 Anthony P. Freund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:29
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/08; F01L13/085; F01L2760/00; F01L2760/001
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
135 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a flyweight having a hub extending substantially perpendicularly therefrom, a non-cylindrically shaped bore disposed in said hub; and a release pin disposed substantially axially parallel to the camshaft, said release pin including a first end having a shape corresponding to said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, and further comprising an adhesive proximate said first end of said release pin, wherein said release pin is adhesively secured to said flyweight.
Claim 2
Dependent Claim
135 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a flyweight having a hub extending substantially perpendicularly therefrom, a non-cylindrically shaped bore disposed in said hub; and a release pin disposed substantially axially parallel to the camshaft, said release pin including a first end having a shape corresponding to said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, and further comprising an adhesive proximate said first end of said release pin, wherein said release pin is adhesively secured to said flyweight.
Claim 3
Dependent Claim
138 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a flyweight having a hub extending substantially perpendicularly therefrom, a non-cylindrically shaped bore disposed in said hub; and a release pin disposed substantially axially parallel to the camshaft, said release pin including a first end having a shape corresponding to said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, wherein the release pin includes an annular groove within which a retaining ring is received to thereby retain the release pin in the compression release mechanism.
Claim 4
Dependent Claim
138 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a flyweight having a hub extending substantially perpendicularly therefrom, a non-cylindrically shaped bore disposed in said hub; and a release pin disposed substantially axially parallel to the camshaft, said release pin including a first end having a shape corresponding to said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, wherein the release pin includes an annular groove within which a retaining ring is received to thereby retain the release pin in the compression release mechanism.
Claim 5
Dependent Claim
15 words
The compression release mechanism of claim 2 , wherein said complementary shape is a D-shape.
Claim 6
Dependent Claim
17 words
The compression release mechanism of claim 2 , wherein said flyweight is integrally formed in one piece.
Claim 7
Dependent Claim
18 words
The compression release mechanism of claim 2 , wherein said release pin is integrally formed in one piece.
Claim 8
Dependent Claim
21 words
The compression release mechanism of claim 2 , wherein said release pin is rotatably received through the inboard and outboard cams.
Claim 9
Dependent Claim
29 words
The compression release mechanism of claim 2 , wherein said lift member is disposed adjacent a side of the outboard cam, said side facing away from the cam gear.
Claim 10
Dependent Claim
134 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a one-piece flyweight having a hub extending substantially perpendicularly therefrom, a bore disposed in said hub; and a release pin including a first end having a shape matching said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, said release pin rotatably disposed through the inboard and outboard cams, and further comprising an adhesive proximate said first end of said release pin, wherein said release pin is adhesively secured to said flyweight.
Claim 11
Dependent Claim
134 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a one-piece flyweight having a hub extending substantially perpendicularly therefrom, a bore disposed in said hub; and a release pin including a first end having a shape matching said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, said release pin rotatably disposed through the inboard and outboard cams, and further comprising an adhesive proximate said first end of said release pin, wherein said release pin is adhesively secured to said flyweight.
Claim 12
Dependent Claim
137 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a one-piece flyweight having a hub extending substantially perpendicularly therefrom, a bore disposed in said hub; and a release pin including a first end having a shape matching said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, said release pin rotatably disposed through the inboard and outboard cams, wherein the release pin includes an annular groove within which a retaining ring is received to thereby retain the release pin in the compression release mechanism.
Claim 13
Dependent Claim
137 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a one-piece flyweight having a hub extending substantially perpendicularly therefrom, a bore disposed in said hub; and a release pin including a first end having a shape matching said bore, said first end received in said bore, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, said release pin rotatably disposed through the inboard and outboard cams, wherein the release pin includes an annular groove within which a retaining ring is received to thereby retain the release pin in the compression release mechanism.
Claim 14
Dependent Claim
17 words
The compression release mechanism of claim 9 , wherein the one-piece flyweight is an integrally molded structure.
Claim 15
Dependent Claim
16 words
The compression release mechanism of claim 9 , wherein the one-piece flyweight is molded from nicad-zinc.
Claim 16
Dependent Claim
18 words
The compression release mechanism of claim 9 , wherein the bore in the hub has a non-cylindrical shape.
Claim 17
Dependent Claim
13 words
The compression release mechanism of claim 9 , wherein the bore is D-shaped.
Claim 18
Dependent Claim
21 words
The compression release mechanism of claim 9 , wherein said release pin is rotatably received through the inboard and outboard cams.
Claim 19
Dependent Claim
29 words
The compression release mechanism of claim 9 , wherein said lift member is disposed adjacent a side of the outboard cam, said side facing away from the cam gear.
Claim 20
Dependent Claim
129 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a one-piece flyweight having a hub extending substantially perpendicularly therefrom, a bore disposed in said hub; and a release pin including a first end having a shape matching said bore, said first end received in said bore and secured therein by crimping a portion of the hub against the first end of the release pin, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, said release pin rotatably disposed through the inboard and outboard cams.
Claim 21
Dependent Claim
129 words
A compression release mechanism for relieving compression during engine starting in an internal combustion engine having a camshaft rotatably disposed within a housing, the camshaft having inboard and outboard cams and a cam gear disposed thereon, said mechanism comprising: a one-piece flyweight having a hub extending substantially perpendicularly therefrom, a bore disposed in said hub; and a release pin including a first end having a shape matching said bore, said first end received in said bore and secured therein by crimping a portion of the hub against the first end of the release pin, said release pin having a lift member disposed at a second end thereof, said lift member adapted to selectively engage a valve actuation device, said release pin rotatably disposed through the inboard and outboard cams.
Claim 22
Dependent Claim
21 words
The compression release mechanism of claim 16 , wherein the crimped portion of the hub is deformed against the release pin.
Claim 23
Dependent Claim
24 words
The compression release mechanism of claim 16 , wherein the release pin is provided with a non-cylindrical portion against which the hub is deformed.
Claim 24
Dependent Claim
23 words
The compression release mechanism of claim 18 , wherein the release pin is provided with a groove into which the hub is deformed.
Claim 25
Dependent Claim
17 words
The compression release mechanism of claim 16 , wherein the one-piece flyweight is an integrally molded structure.
Claim 26
Dependent Claim
34 words
The compression release mechanism of claim 16 , wherein the release pin includes an annular groove within which a retaining ring is received to thereby retain the release pin in the compression release mechanism.
Claim 27
Dependent Claim
21 words
The compression release mechanism of claim 16 , wherein said release pin is rotatably received through the inboard and outboard cams.
Claim 28
Dependent Claim
29 words
The compression release mechanism of claim 16 , wherein said lift member is disposed adjacent a side of the outboard cam, said side facing away from the cam gear.
References Cited (Backward Citations)
US3362390A
Cited
US3395689A
Cited
US3381676A
Cited
US3496922A
Cited
US3897768A
Cited
US4241620A
Cited
US4252092A
Cited
JPS5943913A
Cited
US4672930A
Cited
US4696266A
Cited
JPS62265414A
Cited
US4898133A
Cited
US4977868A
Cited
EP0515183A1
Cited
US5184586A
Cited
US5197422A
Cited
US5301643A
Cited
US5687683A
Cited
US5711264A
Cited
US5809958A
Cited
US5823153A
Cited
WO2001061157A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-08-26 | 2006-02-25 | 2006-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-08-26 | 2010-02-25 | 2010-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-08-26 | 2014-02-25 | 2014-08-27 | $7700.00 | Window Closed / Lapsed |