Valve arrangement for internal combustion engine

• US 4,679,532 A
• Filed: 08/12/1985
• Issued: 07/14/1987
• Est. Priority Date: 08/15/1984
• Status: Expired due to Term

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Tsuchida, Naoki, Aoi, Kazuo
• Primary Examiner(s): Lazarus, Ira S.
• Application Number:
  US06/764,880
• Time in Patent Office: 701 Days
• Field of Search: 123/90.27, 123/90.4, 123/90.22, 123/90.23, 123/308, 123/315
• US Class Current: 123/90.22
• CPC Class Codes: F01L 1/265 peculiar to machines or engines with three or more intake valves per cylinder
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder
• CPC Class Codes: F02B 2075/027 four
• CPC Class Codes: F02B 2275/18 DOHC [Double overhead camshaft]
• CPC Class Codes: F02F 1/4221 particularly for three or more inlet valves
• CPC Class Codes: F02F 2001/245 the valve stems being orientated at an angle with the cylinder axis

Abstract

A valve placement arrangement for an internal combustion engine including at least three intake valves and two exhaust valves and wherein no two of the exhaust valves are adjacent to each other and they are separated by intake valves so as to insure against undue heating and minimize thermo-loading.

Claims

1. In a valve arrangement for an internal combustion engine having a combustion chamber having a peripheral edge in plan view defining a closed curve, at least three intake valves serving said chamber, and at least two exhaust valves serving said chamber, the improvement comprising said valves being located so that their outer edges all lie adjacent said closed curve so that said valves lie on a closed curve spaced inwardly from the peripheral edge of said combustion chamber in plan view, no two of said exhaust valves being adjacent to each other around the closed curve upon which they lie.

2. In a valve arrangement as set forth in claim 1 wherein the combustion chamber has a circular cross-sectional configuration in plan view and the valves are circumferentially spaced from each other.

3. A valve arrangement as set forth in claim 2, wherein the circumferential spacing of the valves is such that no two exhaust valves are adjacent to each other in a circumferential direction.

4. In a valve arrangement for an internal combustion engine having a combustion chamber having a circular cross-sectional configuration in plan view, at least three intake valves serving said chamber, and at least two exhaust valves serving said chamber, the improvement comprising said valves being circumferentially spaced from each other and no two of said exhaust valves being adjacent to each other, two of the intake valves lie on one side of a plane containing the center of the combustion chamber and the other of the intake valves lies on the opposite side of the plane, the exhaust valves lying substantially on said other side of said plane.

5. In a valve arrangement as set forth in claim 4 further including a spark plug positioned centrally in the chamber.

6. In a valve arrangement as set forth in claim 5 wherein the intake passage serving the intake valve on the side opposite the plane extends through one surface of that side of the cylinder head and the exhaust passages extend through another surface of that side of the cylinder head.

7. A valve arrangement as set forth in claim 5, wherein the intake valves lie on opposite sides of a plane perpendicular to the first mentioned plane and passing through the center of the combustion chamber, the other of the intake valves being intersected by the perpendicular plane.