US4776305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust timing control device for two-cycle engines
Assignee: Honda Motor Co Ltd
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Filing: 1987-05-20
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Granted: 1988-10-11
•
Expires: 2007-05-20
Abstract
Abstract A two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the exhaust port with an exhaust timing control device located in the exhaust passage. The device includes a valve body which, in a first embodiment, is pivotally mounted in the exhaust passage and extends to the exhaust port. In a second embodiment, the valve body is fixed at one end and operates as a flexible resilient member to acheive variation in timing control. Each valve body is biased against a cam mechanism which may be rotated to actuate the valve body for controlling exhaust timing. The cam also provides a sealing mechanism between the valve body and the upper surface of the exhaust passage.
Inventors
- 👤 Ikuo Oike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:27
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/028; F02D13/0284; F01; F01L; F01L1/00; F01L1/36; F01L1/38; F01L7/00; F01L7/10; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
109 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; and a cam pivotally mounted relative to and selectively extendible at least partially into the exhaust passage; biasing means coupled to said valve body for biasing said valve body against said cam for selective movement of said valve body with pivotal movement of said cam.
Claim 2
Dependent Claim
109 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; and a cam pivotally mounted relative to and selectively extendible at least partially into the exhaust passage; biasing means coupled to said valve body for biasing said valve body against said cam for selective movement of said valve body with pivotal movement of said cam.
Claim 3
Dependent Claim
19 words
The exhaust timing control device of claim 1 wherein said cam abuts against the top of the exhaust passage.
Claim 4
Dependent Claim
30 words
The exhaust timing control device of claim 2 wherein said cam is in sealing abutment with said valve body and in sealing abutment with the top of the exhaust passage.
Claim 5
Dependent Claim
58 words
The exhaust timing control device of claim 1 wherein said valve body is pivotally mounted relative to the exhaust passage about a pivot axis in a plane with which the axial direction of the cylinder is normal, said cam being in contact with said valve body between said pivot axis and said distal end of said valve body.
Claim 6
Dependent Claim
26 words
The exhaust timing control device of claim 4 wherein the pivot axis of said cam and the pivot axis of said valve body are substantially parallel.
Claim 7
Dependent Claim
28 words
The exhaust timing control device of claim 1, wherein said biasing means comprises a spring coupled with said valve body to bias said valve body against said cam.
Claim 8
Dependent Claim
33 words
The exhaust timing control device of claim 1 wherein said valve body includes a flexible plate member fixed at an end displaced from the exhaust port and terminating adjacent to the exhaust port.
Claim 9
Dependent Claim
31 words
The exhaust timing control device of claim 7 wherein said valve body further includes a valve member fixed at an end of said flexible plate member closest to the exhaust port.
Claim 10
Dependent Claim
16 words
The exhaust timing control device of claim 8 wherein said cam bears on said valve member.
Claim 11
Dependent Claim
24 words
The exhaust timing control device of claim 7 wherein said flexible plate member is in flexure to bias said valve body against said cam.
Claim 12
Dependent Claim
110 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder, said valve body including a flexible plate member fixed at a proximal end displaced from the exhaust port and extending toward the exhaust port; and a means for actuating said valve body operatively positioned above said valve body, said valve body being biased against said means.
Claim 13
Dependent Claim
110 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder, said valve body including a flexible plate member fixed at a proximal end displaced from the exhaust port and extending toward the exhaust port; and a means for actuating said valve body operatively positioned above said valve body, said valve body being biased against said means.
Claim 14
Dependent Claim
31 words
The exhaust timing control device of claim 11 wherein said actuating means is in sealing abutment against said valve body and in sealing abutment with the top of the exhaust passage.
Claim 15
Dependent Claim
31 words
The exhaust timing control device of claim 11 wherein said valve body further includes a valve member fixed at an end of said flexible plate member closest to the exhaust port.
Claim 16
Dependent Claim
17 words
The exhaust timing control device of claim 13 wherein said actuating means bears on said valve member.
Claim 17
Dependent Claim
25 words
The exhaust timing control device of claim 11 wherein said flexible plate member is in flexure to bias said valve body against said actuating means.
Claim 18
Dependent Claim
110 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder an an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; a cam pivotally mounted on the upper side of and selectively extendible at least partially into the exhaust passage, said cam pivotable to a desired position based on engine parameters; and biasing means coupled to said valve body for biasing said valve body against said cam.
Claim 19
Dependent Claim
110 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder an an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; a cam pivotally mounted on the upper side of and selectively extendible at least partially into the exhaust passage, said cam pivotable to a desired position based on engine parameters; and biasing means coupled to said valve body for biasing said valve body against said cam.
Claim 20
Dependent Claim
101 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; a cam pivotally mounted relative to the exhaust passage, said cam pivotable to a desired portion based on engine parameters; and biasing means secured directly to said valve body for biasing said valve body against said cam.
Claim 21
Dependent Claim
101 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; a cam pivotally mounted relative to the exhaust passage, said cam pivotable to a desired portion based on engine parameters; and biasing means secured directly to said valve body for biasing said valve body against said cam.
Claim 22
Dependent Claim
15 words
The control device of claim 17 wherein said biasing means comprises a flexible plate member.
Claim 23
Dependent Claim
22 words
The control device of claim 18 wherein said flexible plate member is in flexure to bias said valve body against said cam.
Claim 24
Dependent Claim
109 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; and a cam pivotally mounted relative to and abutting against the top of the exhaust passage; and biasing means coupled to said valve body for biasing said valve body against said cam for selective movement of said valve body with pivotal movement of said cam.
Claim 25
Dependent Claim
109 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; and a cam pivotally mounted relative to and abutting against the top of the exhaust passage; and biasing means coupled to said valve body for biasing said valve body against said cam for selective movement of said valve body with pivotal movement of said cam.
Claim 26
Dependent Claim
150 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; and a cam pivotally mounted relative to the exhaust passage; biasing means coupled to said valve body for biasing said valve body against said cam for selective movement of said valve body with pivotal movement of said cam, said valve body pivotally mounted relative to the exhaust passage about a pivot axis in a plane with which the axial direction of the cylinder is normal, said cam being in contact with said valve body between said pivot axis and said distal end of said valve body.
Claim 27
Dependent Claim
150 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder; and a cam pivotally mounted relative to the exhaust passage; biasing means coupled to said valve body for biasing said valve body against said cam for selective movement of said valve body with pivotal movement of said cam, said valve body pivotally mounted relative to the exhaust passage about a pivot axis in a plane with which the axial direction of the cylinder is normal, said cam being in contact with said valve body between said pivot axis and said distal end of said valve body.
Claim 28
Dependent Claim
127 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder, said valve body also including a flexible plate member fixed at an end displaced from the exhaust port and terminating adjacent to the exhaust port; a cam pivotally mounted relative to the exhaust passage; and biasing means coupled to said valve body for biasing said valve body against said cam for selective movement of said valve body with pivotal movement of said cam.
Claim 29
Dependent Claim
127 words
An exhaust timing control device for a two-cycle engine having a cylinder, an exhaust port through the wall of the cylinder and an exhaust passage extending from the cylinder at the exhaust port, comprising a valve body in the exhaust passage having a distal end which terminates adjacent to the exhaust port, said distal end being movable in the axial direction of the cylinder, said valve body also including a flexible plate member fixed at an end displaced from the exhaust port and terminating adjacent to the exhaust port; a cam pivotally mounted relative to the exhaust passage; and biasing means coupled to said valve body for biasing said valve body against said cam for selective movement of said valve body with pivotal movement of said cam.
References Cited (Backward Citations)
JPS5121038A
Cited
US4121552A
Cited
JPS5139112A
Cited
JPS5142497A
Cited
JPS5174623A
Cited
JPS51147813A
Cited
JPS5218333A
Cited
JPS52132916A
Cited
US4202297A
Cited
JPS54158514A
Cited
JPS55160107A
Cited
US4325335A
Cited
JPS5627014A
Cited
JPS5647609A
Cited
US4333431A
Cited
US4364346A
Cited
US4341188A
Cited
US4516540A
Cited
JPS5762917A
Cited
US4388894A
Cited
US4391234A
Cited
JPS57105511A
Cited
US4399788A
Cited
JPS587060A
Cited
JPS5836818A
Cited
US4494506A
Cited
JPS587059A
Cited
JPS597008A
Cited
DE3232786A1
Cited
US4651684A
Cited
JPS5970029A
Cited
JPS59105928A
Cited
US4541371A
Cited
US4621596A
Cited
US4622928A
Cited
US4672925A
Cited
US4672924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |