Piston engine comprising member to cover bottom face of valve head of poppet valve

Inactive Publication Date: 2010-07-22
YAOITA YASUHITO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0057]According to the engines of the three aspects of the present invention, the volume of the combustion chamber reduces by the volume of an upper part of the member which protrudes into the space in the combustion chamber which would face with the closed poppet valve if the member were not provided. Therefore, the engines can achieve high compression ratio of the combustion chamber. Thu

Problems solved by technology

As a result, the negative work increases.
This increases the loss caused by the suction resistance, so that the torque lowers.
As a result, just after the piston leaves the bottom dead point, the exhaust resistance causes a great loss.
Consequently, the combustion chamber having a suction valve facing the top of the piston and a side valve cannot have a high combustion ratio, so that the engine efficiency is low.
As a result, knocking occurs.
If the strokes of the piston are longer than its diameter, the combustion

Method used

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  • Piston engine comprising member to cover bottom face of valve head of poppet valve
  • Piston engine comprising member to cover bottom face of valve head of poppet valve
  • Piston engine comprising member to cover bottom face of valve head of poppet valve

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Experimental program
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first embodiment

[0069]A first embodiment will be described.

[0070]The first embodiment is included in the first aspect.

[0071]A piston engine shown in FIGS. 1 and 2 comprises a cylinder head 5, a cylinder block 6, a main cylinder 1, a piston 26, a sub cylinder 4, overhead valves 25A and 25B, and a poppet valve 2.

[0072]The piston 26 reciprocates in the main cylinder 1. A combustion chamber 27 is defined between the cylinder head 5 and the piston 26. The combustion chamber 27 further extends outside the main cylinder 1. An inner wall of the combustion chamber 27 comprises a first part and a second part. The first part represents the inner wall which faces with an upper face of the piston 26. The second part represents the inner wall of the extended part outside the main cylinder 1.

[0073]The combustion chamber 27 may extend both right and left sides outside the main cylinder 1.

[0074]The sub cylinder 4 is installed in the cylinder block 6 which locates outside the main cylinder 1.

[0075]The overhead valve...

second embodiment

[0125]The second embodiment will be described.

[0126]In FIG. 4, the sub cylinder 4 is provided in the cylinder head 5. In this case, the gas path contacting with the poppet valve 2 is provided in the cylinder block. The poppet valve 2 provided outside the cylinder is a side valve.

third embodiment

[0127]The third embodiment will be described.

[0128]In FIG. 5, a pneumatic unit, hydraulic unit 19, electromagnetic unit or electric unit is employed in place of the spring 12. These units bias the valve cover 7 so that the upper face 8 presses the bottom face of the poppet valve 2. These units and the third spring 12 are to bias the valve cover 7 toward the valve sheet 16.

[0129]In FIG. 5, the compression ring 9 is subject to the pressure of the combustion gas so that the valve cover is pushed downwards. The valve cover and the bottom face of the poppet valve are not separated from each other by the pressing force.

[0130]The above-described units including the hydraulic unit 19 bias the valve cover toward the valve sheet 16 of the poppet valve 2 with a force not less than this pressing force.

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PUM

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Abstract

To achieve high compression ratio and lower temperature of the exhaust poppet valve in an engine provided with a poppet valve on an extend part of a combustion chamber outside a main cylinder, disclosed is a valve cover having a cylindrical side face and upper face, an compression ring either the cylindrical side face and an inner wall of the sub cylinder, means to contact closely a bottom face of a poppet valve and the upper face of the valve cover, the upper part of the valve cover occupying most part of the combustion chamber facing with the bottom face, the valve cover moves along with the poppet valve when the poppet valve is lifted, a combination of overhead valves and the poppet valve including one intake valve and one exhaust valve, and total number of the overhead valve and poppet valve is not less than 3.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a piston engine comprising a member to cover a bottom face of a valve head of a poppet valve. When the combustion chamber extends outside the main cylinder, the member occupies a space facing with the bottom face of the poppet valve provided outside a main cylinder in a combustion chamber.[0003]2. Description of the Related Art[0004]The suction resistance and exhaust resistance of a four cycle engine are high when it rotates at high speed. The suction lifts in this engine are extremely small in the initial stages of the periods when the suction valve is open. The initial stages are shorter when the engine rotates at a higher speed. This restricts the inflow of suction gas. As a result, in the initial stages of the periods when the suction valve is open, the pressure in the cylinder is lower than the pressure at the back of the piston.[0005]Under this condition, the piston keeps moving do...

Claims

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Application Information

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IPC IPC(8): F01L3/00F01M1/02
CPCF01L1/252F01L1/28F01L1/46F01M2011/022F01L2001/0535F01L2001/0537F01L2001/054F01L3/20
Inventor YAOITA, YASUHITO
Owner YAOITA YASUHITO
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