Rotary Valve Construction

Inactive Publication Date: 2007-12-06
BISHOP INNOVATION PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0040] In a third aspect, the present invention consists of a rotary valve assembly for an internal combustion engine, comprising a rotary valve in accordance with the first aspect of the invention, a cylinder head having a bore in which said valve is supported by bearing means and rotates with a small predetermined clearance between s

Problems solved by technology

These arrangements failed because they were unable to cope with the inevitable thermal and mechanical distortion of the valve which invariably resulted in seizure of the valve in the sleeve.
Although many attempts were made to design sleeves that overcome this problem, none were commercialised.
The combination of this small clearance and small pressures in the inlet and exhaust ports limit the flow of gases between the ports.
Thermal distortion generally results in a “permanent” distorted valve shape that rotates with the valve.
This type of contact typically results in seizure of the valve in the cylinder head bore.
Further, the presence of two ports in the same valve dramatically reduces the space available for valve cooling passages.
Mechanical distortion occurs as a result of cylinder pressure acting on the periphery of the valve that is blocking the window during the compression and power strokes.
However, some prior art patent documents only show the rotary valve constructional and cooling details schematically, as these details were not relevant to the disclosure.
This core is exceedingly complex with thin wall sections and can only be manufactured using ceramic, which is very fragile, expensive and difficult to remove from the casting.
In practise these valves are extremely difficult to cast and require use of the investment casting process which further increases the complexity and cost.
As a result this edge becomes extremely hot and suffers considerable local thermal distortion which damages the axial seals used to seal the combustion gases in the cylinder.
Localised cooling of this area cannot be pro

Method used

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  • Rotary Valve Construction
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Examples

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Example

[0055]FIG. 1 depicts a first embodiment of a rotary valve assembly according to the present invention comprising a valve 1 and a cylinder head 2. Valve 1 has an inlet port 3 and an exhaust port 4. Valve 1 has a centre portion 5 of constant diameter with an inlet portion 9 of reduced diameter on one side and exhaust portion 16 of reduced diameter on the other side. Inlet portion 9 extends between centre portion 5 and the inlet end 42 of valve 1. Exhaust portion 16 extends between centre portion 5 and the exhaust end 43 of valve 1. Inlet port 3 extends from inlet end 42 of valve 1 and terminates at inlet opening 6 in the periphery of centre portion 5. Exhaust port 4 extends from exhaust end 43 and terminates at exhaust opening 7 in the periphery of centre portion 5. Inlet port 3 and exhaust port 4 are separated by a common wall 23. Valve 1 is supported by bearings 8 to rotate about axis 10 in cylinder head 2. Bearings 8 support the periphery of inlet portion 9 and exhaust portion 16. ...

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Abstract

An axial flow rotary valve (1) for an internal combustion engine and method of manufacture thereof. The valve comprising a centre portion (5) having a cylindrical periphery, inlet and exhaust portions (9, 16) both smaller in diameter than the centre portion, and an inlet port (3) and an exhaust port (4) terminating respectively as an inlet opening (6) and an exhaust opening (7) in the periphery of the centre portion. The centre portion having at least one elongate passage (21) communicating between the inlet portion and the exhaust portion, the whole of the passage being disposed circumferentially outside the openings and radially outside at least one of the inlet and exhaust portions.

Description

TECHNICAL FIELD [0001] The present invention relates to a valve for a rotary valve internal combustion engine and manufacture thereof. In particular it relates to axial flow rotary valves with internal cooling and incorporating both an inlet port and an exhaust port in the same valve. BACKGROUND [0002] The present invention relates to axial flow rotary valves incorporating an inlet and an exhaust port in the same valve. These ports terminate as openings in the periphery of the valve. During rotation these openings periodically align with a similar window in the cylinder head allowing the passage of gas from the valve to the cylinder and vice versa. [0003] Rotary valves which run with a small predetermined clearance to the cylinder head bore were developed to address the problem of thermal and mechanical deflection of the valve, which had plagued rotary valve development for the most part of the 20th century. Rotary valves were traditionally sealed by the use of a close fitting stati...

Claims

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Application Information

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IPC IPC(8): F01L7/02
CPCF01L7/023F01L7/024F01L2101/02F01L2101/00F01L7/16F01L2301/00F01L2301/02
Inventor WALLIS, ANTHONY BRUCETHOMAS, ANDREW DONALDROESKE, KLAUS JUERGEN
Owner BISHOP INNOVATION PTY LTD
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