EP0318303A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Valve operating system for internal combustion engines
Assignee: Honda Motor Co Ltd
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Filing: 1988-11-25
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Granted: —
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Expires: 2008-11-25
Abstract
Abstract A drive cam follower (24) operatively connected to an engine valve and a free cam follower (25) capable of becoming free relative to the engine valve are adjacently disposed for operation in mutually different modes in response to rotation of a cam shaft. A connection change-over mechanism (26) is provided between the cam followers and capable of changing-over the interconnection and disconnection thereof, and resilient biasing means (125) is provided between the free cam follower and an engine body for resiliently urging the free cam follower toward the cam shaft. The resilient biasing means comprises an urging piston slidably received in the engine body for abutmant against the free cam follower, and a spring (127,128) interposed between the urging piston and the engine body to resiliently bias the urging piston in a direction to abut against the free cam folllower. The urging piston is provided, at its end closer to the free cam follower, with an abutment (126) formed of a reduced diameter to abut against the free cam follower. This facilitates assembling of the resilient biasing means to the engine body, and makes it possible to dispose the resilient biasing means in proximity to a pivoting point of the free cam follower.
Inventors
- 👤 Toshihiro C/O Kabushiki Kaisha Honda Oikawa
- 👤 Tsuneo C/O Kabushiki Kaisha Honda Tanai
- 👤 Noriyuki C/O Kabushiki Kaisha Honda Yamada
- 👤 Tsutomu C/O Kabushiki Kaisha Honda Saka
- 👤 Toshiki C/O Kabushiki Kaisha Honda Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/26; F01L1/267; F01M; F01M9/00; F01M9/10; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F01L2001/0537; F01L1/34; F01L1/344; F01L1/3442; F01L2001/34423; F01L2001/34436; F01M9/101; F01M9/102; F01M9/108; F02; F02B; F02B2275/00; F02B2275/18
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
174 words
A valve operating system for internal combustion engines, comprising a drive cam follower operatively connected to an engine valve, a free cam follower capable of becoming disengaged from the engine valve, said cam followers being adjacently disposed for operation in mutually different modes in response to rotation of a cam shaft, a connection change-over mechanism provided between said cam followers and capable of changing-over connection and disconnection between the followers, and resilient biasing means provided between said free cam follower and an engine body for resiliently urging said free cam follower toward said cam shaft, wherein said resilient biasing means comprises an urging piston slidably received in the engine body for abutment against the free cam follower, and a spring interposed between the urging piston and the engine body to resiliently bias the urging piston in a direction to abut against the free cam folllower, the urging piston being provided, at an end thereof closer to the free cam follower, with an abutment having a reduced diameter to abut against the free cam follower.
Claim 2
Dependent Claim
174 words
A valve operating system for internal combustion engines, comprising a drive cam follower operatively connected to an engine valve, a free cam follower capable of becoming disengaged from the engine valve, said cam followers being adjacently disposed for operation in mutually different modes in response to rotation of a cam shaft, a connection change-over mechanism provided between said cam followers and capable of changing-over connection and disconnection between the followers, and resilient biasing means provided between said free cam follower and an engine body for resiliently urging said free cam follower toward said cam shaft, wherein said resilient biasing means comprises an urging piston slidably received in the engine body for abutment against the free cam follower, and a spring interposed between the urging piston and the engine body to resiliently bias the urging piston in a direction to abut against the free cam folllower, the urging piston being provided, at an end thereof closer to the free cam follower, with an abutment having a reduced diameter to abut against the free cam follower.
Claim 3
Dependent Claim
56 words
A valve operating system for internal combustion engines according to claim 1, further including a cylindrical guide member fitted in the engine body, in which the urging piston is slidably received, and a stopper detachably fixed to an inner surface of said guide member adjacent the open end thereof so as to engage said urging piston.
Claim 4
Dependent Claim
29 words
3 A valve operating system for internal combustion engines according to claim 2, wherein said stopper comprises a retaining ring of a circular shape with a cut out portion.
Claim 5
Dependent Claim
42 words
A valve operating system for internal combustion engines according to claim 1, 2 or 3 wherein that end of said urging piston closer to the free cam follower is formed with a tapered abutment capable of abutting against said free cam follower.
Claim 6
Dependent Claim
100 words
A valve operating system for internal combustion engines according to any preceding claim wherein said connection change-over mechanism includes a change-over pin movable between a position in which the adjacent cam followers are connected together and a position in which such connection is released, and the abutment of the urging piston is disposed to abut against the free cam follower between a surface extending through a center line of said change-over pin in parallel to an axis of a cylinder and a surface extending through a pivoting point of the cam follower in parallel to the axis of the cylinder.
Claim 7
Dependent Claim
78 words
A valve operating system for internal combustion engines according to any of claims 1 to 4, wherein said connection change-over mechanism includes a change-over pin movable between a position in which the adjacent cam followers are connected together and a position in which such connection is released, an axis of said urging piston extending through a center of said abutment and being disposed between the center of said change-over pin and the pivoting point of said cam follower.
Claim 8
Dependent Claim
48 words
A valve operating system for internal combustion engines according to any preceding claim further including a first spring having a relatively small spring constant and a second spring having a relatively large spring constant, said springs being interposed in series between said urging piston and said engine body.
Claim 9
Dependent Claim
22 words
A valve operating system for internal combustion engines according to claim 7, further including a retainer between said first and second springs.
Claim 10
Dependent Claim
63 words
A valve operating system for internal combustion engines according to any preceding claim including a cylindrical guide member fitted in the engine body, in which said urging piston is slidably received, and an air vent hole made in the abutment of said urging piston for permitting a spring chamber defined between said urging piston and said guide member to communicate with the outside.
Claim 11
Dependent Claim
31 words
A valve operating system for internal combustion engines according to claim 9, wherein said air vent hole is cross-shaped so that it is opened to an outer surface of said abutment.
Claim 12
Dependent Claim
49 words
A valve operating system for internal combustion engines according to claim 8, wherein said retainer includes projections for fitting ends of said first and second springs, said projections being provided on front and rear surfaces of a disk-shaped body of the retainer to receive said first and second springs.
Claim 13
Dependent Claim
56 words
A valve operating system for internal combustion engines according to claim 6, 7 or 8, wherein at least the second spring of said first and second springs comprises a coiled spring having a non-linear load characteristic having a spring load increased in variation with an increase in amount of displacement but having a substantially uniform diameter.
Claim 14
Dependent Claim
110 words
A valve operating system for internal combustion engines according to any preceding claim including a cylindrical guide member fitted in the engine body, in which said urging piston is slidably received, an ejecting aperture provided in said urging piston and opened to an end of the piston closer to said free cam follower, a lubricating oil inlet passage provided in a cylinder head being said engine body and opened to an upper surface of the cylinder head to introduce a lubricating oil, and a lubricating oil inlet hole made in said guide member to communicate with said lubricating oil inlet passage and capable of being closed by said urging piston.
Claim 15
Dependent Claim
75 words
A valve operating system for internal combustion engines according to claim 13, wherein said connection change-over mechanism includes a change-over pin movable between a position in which the adjacent cam followers are connected together and a position in which such connection is released, and the ejection direction of said ejecting aperture is established toward between said drive cam follower and said free cam follower at a location in which said connection change-over mechanism is provided.
Claim 16
Dependent Claim
52 words
A valve operating system for internal combustion engines according to claim 13 or 14, wherein the upper surface of the cylinder head is formed so that it is inclined toward and in the vicinity of an opening of said lubricating oil inlet passage which faces said upper surface of the cylinder head.
Claim 17
Dependent Claim
59 words
A valve operating system for internal combustion engines according to claim 13, 14 or 15, wherein said lubricating oil inlet hole is made in said guide member between a lower end edge of said urging piston which is in its uppermost limit position and the lower end edge of said urging piston which is in its lowermost limit position.
References Cited (Backward Citations)
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