Patent US4856469A successfully refreshed from Google Patents.
US4856469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical parts of valve driving mechanism for internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1988-09-22
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Granted: 1989-08-15
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Expires: 2008-09-22
Abstract
Abstract A valve driving mechanism of which a rocker arm is provided at one end portion with a roller brought into a rotative contact with a cam surface of a cam for driving engine valves. The cam consists of 2.0-4.0 wt % of C, 1.5-3.5 wt % of Si, 0.1-1.0 wt % of Mn, 0.005-0.08 wt % of Mg, less than 0.15 wt % of P, less than 0.15 wt % of S, 0.3-1.0 wt % of Cu, 0.03-0.09 wt % of Mo with the balance of Fe, with a matrix of the cam being a granular graphite cast iron having a mixed structure of 30-50 vol % of residual austenite structure and a bainite structure.
Inventors
- 👤 Ken Okazaki
- 👤 Kazuo Satou
- 👤 Junichi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:10
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/18; F01L1/181; C; C22; C22C; C22C37/00; C22C37/10; F01L1/02; F01L1/04; F01L1/047; F01L2301/00; F01L2305/00; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20882; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
In a valve driving mechanism of which a rocker arm is provided at one end portion with a roller brought into a rotative contact with a cam surface of a cam for driving engine valves, the improvement comprising the cam consisting of 2.0-4.0 wt % of C, 1.5-3.5 wt % of Si, 0.1-1.0 wt % of Mn, 0.005-0.08 wt % of Mg, less than 0.15 wt % of P, less than 0.15 wt % of S, 0.3-1.0 wt % of Cu, 0.03-0.09 wt % of Mo with the balance of Fe, a matrix of the cam being a granular graphite cast iron having a mixed structure of 30-50 vol % of residual austenite structure and a bainite structure.
Claim 2
Dependent Claim
118 words
In a valve driving mechanism of which a rocker arm is provided at one end portion with a roller brought into a rotative contact with a cam surface of a cam for driving engine valves, the improvement comprising the cam consisting of 2.0-4.0 wt % of C, 1.5-3.5 wt % of Si, 0.1-1.0 wt % of Mn, 0.005-0.08 wt % of Mg, less than 0.15 wt % of P, less than 0.15 wt % of S, 0.3-1.0 wt % of Cu, 0.03-0.09 wt % of Mo with the balance of Fe, a matrix of the cam being a granular graphite cast iron having a mixed structure of 30-50 vol % of residual austenite structure and a bainite structure.
Claim 3
Dependent Claim
19 words
A valve driving mechanism in accordance with claim 1 wherein the roller is constituted by a carburized steel material.
Claim 4
Dependent Claim
34 words
A valve driving mechanism in accordance with claim 1 wherein C, Si, Mn and Mg included in the cam material are substantially the same rates as those in a ductile cast iron commonly used.
Claim 5
Dependent Claim
34 words
A valve driving mechanism in accordance with claim 1 wherein P and S are included in the material as a impurity by substantially the same quantity as in the ductile cast iron commonly used.
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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) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |