Patent US4651704A successfully refreshed from Google Patents.
US4651704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breather arrangement for cam case of internal combustion engine
Assignee: Honda Motor Co Ltd
•
Filing: 1986-01-27
•
Granted: 1987-03-24
•
Expires: 2006-01-27
Abstract
Abstract A breather arrangement for an internal combustion engine includes a hollow cam shaft which is disposed in a cam case of the engine. Blow-by gas in the cam case is admitted into an axial bore of the cam shaft, while oil entrained by the gas is separated by centrifugal forces due to rotation of the cam shaft. This allows only the blow-by gas to be recirculated to an intake system of the engine.
Inventors
- 👤 Norio Sekiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:08
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01M; F01M13/00; F01M13/04; F01M9/00; F01M9/10; F01M9/101; F02; F02M; F02M25/00; F02M25/06; F01M2013/0422; F02B; F02B2275/00; F02B2275/18; F02B75/00; F02B75/16; F02B75/18; F02B75/20; F02F; F02F7/00; F02F7/006; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
A breather arrangement for a cam case of an internal combustion engine, comprising: a hollow can shaft disposed in the cam case and formed with a bore extending axially therethrough, at least one blow-by gas inlet opening for admitting blow-by gas in the cam case into said bore, and at least one oil discharge opening for discharging oil which is deposited in said bore; and a breather pipe to one end of which said bore of said hollow cam shaft is communicated, the other end of said breather pipe communicating to an intake system of the engine.
Claim 2
Dependent Claim
97 words
A breather arrangement for a cam case of an internal combustion engine, comprising: a hollow can shaft disposed in the cam case and formed with a bore extending axially therethrough, at least one blow-by gas inlet opening for admitting blow-by gas in the cam case into said bore, and at least one oil discharge opening for discharging oil which is deposited in said bore; and a breather pipe to one end of which said bore of said hollow cam shaft is communicated, the other end of said breather pipe communicating to an intake system of the engine.
Claim 3
Dependent Claim
45 words
A breather arrangement as claimed in claim 1, wherein the blow-by gas inlet opening extends radially throughout a particular section of the cam shaft other than a cam section and a journal section, said particular section being exposed to the interior of the cam case.
Claim 4
Dependent Claim
23 words
A breather arrangement as claimed in claim 2, wherein the oil discharge opening is positioned in the cam section of the cam shaft.
Claim 5
Dependent Claim
54 words
A breather arrangement as claimed in claim 3, wherein in the cam section of the cam shaft the bore of the cam shaft is shaped to have an offset cross-section in conformity with a cam profile of the cam section, the oil discharge opening being formed in a lobe portion of the cam section.
Claim 6
Dependent Claim
27 words
A breather arrangement as claimed in claim 3, wherein the oil discharge opening is located in a portion of the cam section other than a lobe portion.
Claim 7
Dependent Claim
33 words
A breather arrangement as claimed in claim 1, wherein an inside diameter of the bore of the cam shaft is reduced in a section thereof where the blow-by gas inlet opening is provided.
Claim 8
Dependent Claim
30 words
A breather arrangement as claimed in claim 1, wherein the bore of the cam shaft is communicated to the breather pipe through an aperture which is coaxial with the bore.
Claim 9
Dependent Claim
46 words
A breather arrangement as claimed in claim 1, wherein the bore of the cam shaft is communicated to the breather pipe at one end of the cam shaft which is opposite to the other end where a drive pulley for driving the cam shaft is mounted.
Claim 10
Dependent Claim
72 words
A breather arrangement as claimed in claim 1, wherein the bore of the cam shaft is communicated to the breather pipe through an annular recess formed in an inner periphery of a cam holder, a passageway formed in the cam holder for communicating said annular recess to a threaded bore, and a passageway formed through a bolt which is received in said threaded bore to fix a cylinder head cover in place.
Claim 11
Dependent Claim
40 words
A breather arrangement as claimed in claim 1, wherein the bore of the cam shaft is communicated to the breather pipe by a joint member having a labyrinth portion which is coupled in an open end of the cam shaft.
Claim 12
Dependent Claim
46 words
A breather arrangement as claimed in claim 1, wherein a first cam shaft for actuating intake valves of the engine and a second cam shaft for actuating exhaust valves are disposed in the cam case, each of said cam shafts being provided with the axial bore.
References Cited (Backward Citations)
DE1097755B
Cited
DE1476036A1
Cited
US3326198A
Cited
DE2103061A1
Cited
US4205642A
Cited
US4329968A
Cited
US4270508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |