EXHAUST CONTROL DEVICE FOR VEHICLE ENGINE

• US 20090084338A1
• Filed: 09/25/2008
• Published: 04/02/2009
• Est. Priority Date: 09/28/2007
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Yasui, Shinsuke, TSUBAKINO, Yukihiro, Azumagakito, Isao
• Granted Patent: US 8,453,438 B2
• Time in Patent Office: Days
• US Class Current: 123/190.100
• CPC Class Codes: F01L 1/053 overhead type
• CPC Class Codes: F01L 1/143 for use with overhead camshafts
• CPC Class Codes: F01L 1/18 Rocking arms or levers
• CPC Class Codes: F01L 1/181 Centre pivot rocking arms
• CPC Class Codes: F01L 1/26 characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with coaxial valves F01L1/28
• CPC Class Codes: F01L 2001/0535 Single overhead camshafts [SOHC]
• CPC Class Codes: F02D 9/04 concerning exhaust conduits throttle valves, or arrangements thereof in conduits F02D9/08
• CPC Class Codes: F02D 9/16 the members being rotatable

Abstract

An exhaust control device for a vehicle engine wherein an exhaust pipe forms an exhaust passage along with an exhaust port is connected to a cylinder head via the exhaust port. A rotary valve is capable of changing the opening area of the exhaust passage. The rotary valve being disposed in approximately the middle of the exhaust passage. The opening area of the exhaust passage is made controllable by the rotary valve while avoiding an increase in the number of component parts. A rotary valve having a turning axis located at a position offset from the center of the exhaust port is housed in a valve housing provided integrally with a cylinder head.

Claims

1. An exhaust control device for a vehicle engine in which a combustion chamber faced by a top of a piston is slidably fitted into a cylinder bore included in a cylinder block and is connected to a crankshaft is defined between a cylinder block and a cylinder head joined to the cylinder block, comprising:

an exhaust valve port facing the combustion chamber so as to be opened and closed by an exhaust valve and an exhaust port communicating with the exhaust valve port provided in the cylinder head;

an exhaust pipe forming an exhaust passage along with the exhaust port is connected to the cylinder head via the exhaust port; and

a rotary valve capable of changing an opening area of the exhaust passage is disposed in the middle of the exhaust passage;

wherein the rotary valve, having a turning axle located at a position offset from the center of the exhaust port, is housed in a valve housing provided integrally with the cylinder head.

2. The exhaust control device for a vehicle engine according to claim 1, wherein the valve housing is provided integrally with the cylinder head in such a manner that the rotary valve can change a bent-internal side partial passage sectional area of a bent portion in the exhaust port.

3. The exhaust control device for a vehicle engine according to claim 2, wherein the exhaust side connection pipe forming a portion of the exhaust port expanding in one of left and right directions of a vehicle to bend horizontally is provided integrally with the cylinder head to project therefrom, and

the rotary valve with a turning axis vertically oriented is housed in the valve housing formed integrally with the exhaust side connection pipe.

4. The exhaust control device for a vehicle engine according to claim 2, wherein the exhaust side connection pipe forming a portion of the exhaust port expanding upward to bend vertically is provided integrally with the cylinder head to project therefrom, and

the rotary valve with a turning axis oriented in the left-right direction of a vehicle is housed in the valve housing formed integrally with the exhaust side connection pipe.

5. The exhaust control device for a vehicle engine according to claim 2, wherein the exhaust side connection pipe bending to expand upward and toward one of the left and right of a vehicle so as to form a portion of the exhaust port is provided integrally with the cylinder head (30C) to protrude therefrom, and

the rotary valve having a turning axis vertically slanting to be located on the other side of the left and right of the vehicle as the turning axis goes downward is housed in the valve housing formed integrally with the exhaust side connection pipe.

6. The exhaust control device for a vehicle engine according to claim 1, wherein the axis of the cylinder bore is disposed to be offset from an axis of the crankshaft in a turning direction of the crankshaft.

7. The exhaust control device for a vehicle engine according to claim 2, wherein the axis of the cylinder bore is disposed to be offset from an axis of the crankshaft in a turning direction of the crankshaft.

8. The exhaust control device for a vehicle engine according to claim 3, wherein the axis of the cylinder bore is disposed to be offset from an axis of the crankshaft in a turning direction of the crankshaft.

9. The exhaust control device for a vehicle engine according to claim 4, wherein the axis of the cylinder bore is disposed to be offset from an axis of the crankshaft in a turning direction of the crankshaft.

10. The exhaust control device for a vehicle engine according to claim 5, wherein the axis of the cylinder bore is disposed to be offset from an axis of the crankshaft in a turning direction of the crankshaft.

11. The exhaust control device for a vehicle engine according to claim 1, wherein the cylinder block is joined to a crankcase rotatably journaling the crankshaft having an axis extending in the left-right direction of a vehicle so as to slant an axis of the cylinder bore forwardly upwardly,

a radiator is disposed forward of the cylinder head,

an exhaust port is provided in a front lateral wall of the cylinder head, and

a throttle body connected to an intake port provided in a rear lateral wall of the cylinder head is disposed rearward of the cylinder head.

12. The exhaust control device for a vehicle engine according to claim 2, wherein the cylinder block is joined to a crankcase rotatably journaling the crankshaft having an axis extending in the left-right direction of a vehicle so as to slant an axis of the cylinder bore forwardly upwardly,

a radiator is disposed forward of the cylinder head,

an exhaust port is provided in a front lateral wall of the cylinder head, and

a throttle body connected to an intake port provided in a rear lateral wall of the cylinder head is disposed rearward of the cylinder head.

13. The exhaust control device for a vehicle engine according to claim 3, wherein the cylinder block is joined to a crankcase rotatably journaling the crankshaft having an axis extending in the left-right direction of a vehicle so as to slant an axis of the cylinder bore forwardly upwardly,

a radiator is disposed forward of the cylinder head,

an exhaust port is provided in a front lateral wall of the cylinder head, and

a throttle body connected to an intake port provided in a rear lateral wall of the cylinder head is disposed rearward of the cylinder head.

14. The exhaust control device for a vehicle engine according to claim 4, wherein the cylinder block is joined to a crankcase rotatably journaling the crankshaft having an axis extending in the left-right direction of a vehicle so as to slant an axis of the cylinder bore forwardly upwardly,

a radiator is disposed forward of the cylinder head,

an exhaust port is provided in a front lateral wall of the cylinder head, and

a throttle body connected to an intake port provided in a rear lateral wall of the cylinder head is disposed rearward of the cylinder head.

15. The exhaust control device for a vehicle engine according to claim 5, wherein the cylinder block is joined to a crankcase rotatably journaling the crankshaft having an axis extending in the left-right direction of a vehicle so as to slant an axis of the cylinder bore forwardly upwardly,

a radiator is disposed forward of the cylinder head,

an exhaust port is provided in a front lateral wall of the cylinder head, and

a throttle body connected to an intake port provided in a rear lateral wall of the cylinder head is disposed rearward of the cylinder head.

16. The exhaust control device for a vehicle engine according to claim 6, wherein the cylinder block is joined to a crankcase rotatably journaling the crankshaft having an axis extending in the left-right direction of a vehicle so as to slant an axis of the cylinder bore forwardly upwardly,

a radiator is disposed forward of the cylinder head,

an exhaust port is provided in a front lateral wall of the cylinder head, and

a throttle body connected to an intake port provided in a rear lateral wall of the cylinder head is disposed rearward of the cylinder head.

17. An exhaust control device for a vehicle engine in which a combustion chamber faced by a top of a piston is slidably fitted into a cylinder bore included in a cylinder block and is connected to a crankshaft is defined between a cylinder block and a cylinder head joined to the cylinder block, comprising:

an exhaust valve port facing the combustion chamber, said exhaust valve port being opened and closed by an exhaust valve and an exhaust port communicating with the exhaust valve port provided in the cylinder head;

an exhaust pipe is operatively connected to the cylinder head via the exhaust port; and

a rotary valve operatively positioned within the exhaust pipe for changing an opening area of the exhaust pipe;

said rotary valve, having a turning axle located at a position offset from the center of the exhaust port, is housed in a valve housing provided integrally with the cylinder head.

18. The exhaust control device for a vehicle engine according to claim 17, wherein the valve housing is provided integrally with the cylinder head in such a manner that the rotary valve can change a bent-internal side partial passage sectional area of a bent portion in the exhaust port.

19. The exhaust control device for a vehicle engine according to claim 18, wherein the exhaust side connection pipe forming a portion of the exhaust port expanding in one of left and right directions of a vehicle to bend horizontally is provided integrally with the cylinder head to project therefrom, and

the rotary valve with a turning axis vertically oriented is housed in the valve housing formed integrally with the exhaust side connection pipe.

20. The exhaust control device for a vehicle engine according to claim 18, wherein the exhaust side connection pipe forming a portion of the exhaust port expanding upward to bend vertically is provided integrally with the cylinder head to project therefrom, and

the rotary valve with a turning axis oriented in the left-right direction of a vehicle is housed in the valve housing formed integrally with the exhaust side connection pipe.