US4738602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing an apex seal for a rotary piston engine using high energy heating radiation
Assignee: Mazda Motor Corp
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Filing: 1986-12-04
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Granted: 1988-04-19
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Expires: 2006-12-04
Abstract
Abstract A method for manufacturing an apex seal for a rotary piston engine comprising steps of preparing an apex seal blank made of ceramic material, and applying a high energy heating radiation to the sliding surface of the apex seal blank to form a roughened and porous structure on the surface portion of the apex seal blank. The high energy heating radiation is desirably applied to the apex seal blank under a non-oxidizing atmosphere so that an oxidization of the components of the ceramic material can be prevented.
Inventors
- 👤 Junichi Yamamoto
- 👤 Yoshifumi Yamamoto
- 👤 Katsuya Ohuchi
- 👤 Tsutomu Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:46
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5093; C04B41/5096; C04B41/80; C04B41/81; C04B41/85; F; F01; F01C; F01C19/00; F01C19/005; Y; Y10; Y10S; Y10S29/00; Y10S29/024; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49231; Y10T29/49234; Y10T29/49297; Y10T29/49995
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
A method for manufacturing an apex seal for rotary piston engine wherein the method comprises steps of preparing an apex seal blank made of Si 3 N 4 , and applying a high energy heating radiation to the sliding surface of the apex seal blank to form a roughened and porous structure of Si on the surface portion of the apex seal blank.
Claim 2
Independent Claim
63 words
A method for manufacturing an apex seal for rotary piston engine wherein the method comprises steps of preparing an apex seal blank made of Si 3 N 4 , and applying a high energy heating radiation to the sliding surface of the apex seal blank to form a roughened and porous structure of Si on the surface portion of the apex seal blank.
Claim 3
Dependent Claim
16 words
A method in accordance with claim 1 in which the heating energy radiation is a laser.
Claim 4
Dependent Claim
17 words
A method in accordance with claim 1 in which the heating energy radiation is an electronic beam.
Claim 5
Dependent Claim
19 words
A method in accordance with claim 1 in which the heating energy radiation is applied under a non-oxidizing atmosphere.
Claim 6
Dependent Claim
17 words
A method in accordance with claim 4 in which the non-oxidizing atmosphere is prepared by Ar gas.
Claim 7
Dependent Claim
18 words
A method in accordance with claim 4 in which the non-oxidizing atmonsphere is prepared by CO 2 .
Claim 8
Dependent Claim
35 words
An apex seal for rotary piston engine made of Si 3 N 4 having a roughened and porous structure formed on the sliding surface thereof wherein the roughened and porous structure is constituted by Si.
Claim 9
Dependent Claim
35 words
An apex seal for rotary piston engine made of Si 3 N 4 having a roughened and porous structure formed on the sliding surface thereof wherein the roughened and porous structure is constituted by Si.
Claim 10
Dependent Claim
87 words
A rotary piston engine comprising at least one rotor housing, at least two side housings, at least one rotor disposed in a space defined by the rotor housing and side housings, and apex seals mounted on corners of the rotor brought into sliding contact with a trochoidal surface of the rotor housing wherein the apex seal is made of Si 3 N 4 and provided with a roughened and porous structure of Si formed on the sliding surface thereof by applying a high energy heating radiation thereto.
Claim 11
Dependent Claim
87 words
A rotary piston engine comprising at least one rotor housing, at least two side housings, at least one rotor disposed in a space defined by the rotor housing and side housings, and apex seals mounted on corners of the rotor brought into sliding contact with a trochoidal surface of the rotor housing wherein the apex seal is made of Si 3 N 4 and provided with a roughened and porous structure of Si formed on the sliding surface thereof by applying a high energy heating radiation thereto.
Claim 12
Dependent Claim
30 words
A rotary piston engine in accordance with claim 8 in which the rotor housing is formed with a flame sprayed layer of Cr 2 C 2 on the trochoidal surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |