Conducting and coupling mechanism between angled valve stems

• US 20070107693A1
• Filed: 11/12/2004
• Published: 05/17/2007
• Est. Priority Date: 11/12/2003
• Status: Active Grant

• Current Assignee: Husqvarna Zenoah Co., Ltd. (HUSQVARNA)
• Original Assignee: Komatsu Zenoah Co. (Komatsu)
• Inventors: Ohtsuji, Takamasa
• Granted Patent: US 7,461,631 B2
• Time in Patent Office: Days
• US Class Current: 123/336
• CPC Class Codes: F02D 11/04 characterised by mechanical control linkages F02D11/06 takes precedence
• CPC Class Codes: F02D 2009/0206 specially positioned with relation to engine or engine housing
• CPC Class Codes: F02M 19/124 Connecting rods between at least two throttle valves F02M1/02 takes precedence
• CPC Class Codes: F02M 23/03 the secondary air-valve controlled by main combustion-air throttle
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A transmissible connecting mechanism having a cam plate and a lever are attached respectively to a lead air control valve shaft and an air-fuel mixture throttle valve shaft which are arranged so as to form an angle. A length of a contact element provided in the lever is extended in parallel to an axis of the air-fuel mixture throttle valve shaft, and the length of the contact element is such that the contact element and a cam surface formed in a cam plate are always brought into contact with each other. The lead air control valve shaft and the air-fuel mixture throttle valve shaft of the carburetor are connected in a transmissible manner, and it is possible to make a stratified scavenging two-cycle engine compact.

Claims

1. A transmissible connecting mechanism between valve shafts forming an angle, the transmissible connecting mechanism interlocking and driving the both valve shafts, which are respectively a lead air control valve shaft and an air-fuel mixture throttle valve shaft of a carburetor in a stratified scavenging two-cycle engine, wherein one of the valve shafts is a drive shaft and the other valve shaft is a driven shaft, wherein

the drive shaft and the driven shaft are arranged so as to form an angle,

the transmissible connecting mechanism is arranged so as to be integrally rotatable with the drive shaft and the driven shaft respectively, and is provided with a pair of first cam member and a second cam member which are transmitted to each other in a contact manner, and

a part of a contact surface of the first cam member and a part of a contact surface of the second cam member are always maintained in a contact state at a time of a contact transmission of the first cam member and the second cam member.

2. The transmissible connecting mechanism between valve shafts forming an angle according to claim 1, wherein one cam member of the first cam member and the second cam member comprises a cam plate having a cam surface, the other cam member comprises a lever having a contact element which is brought into contact with the cam surface.

3. The transmissible connecting mechanism between valve shafts forming an angle according to claim 1 or 2, wherein at least one cam member of the first cam member and the second cam member is structured such that the contact surface with the other cam member is extended in parallel to the valve shaft in which the one cam member is arranged.

4. The transmissible connecting mechanism between valve shafts forming an angle according to claim 1 or 2, wherein at least one cam member of the first cam member and the second cam member is slidably urged along the drive shaft or the driven shaft in which the first cam member or the second cam member is arranged, and toward the other second cam member or the first cam member.