JPS5840264Y2 - Valve gear for low speed internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device for a low-speed internal combustion engine, which is generally used as a piston underside pump cancel valve in a Sulza-type low-speed internal combustion engine.

1 and 2 show a conventional example of a Sulza type low-speed internal combustion engine.

Namely, 1 is an exhaust pipe, 2 is a cylinder, 3 is a piston rod, 4 is a scavenging chamber, 5 is an under piston chamber, 6 is a common scavenging chamber, 7 is an auxiliary air chamber, 8, 9 and 10 are check valves. be.

Reference numeral 11 denotes a piston underside pump cancel valve provided on a dividing wall between the underpiston chamber 5 and the scavenging common chamber 6, and is opened and closed by an air cylinder 12.

The compressed air to the air cylinder 12 is controlled by a solenoid valve, and the operation of the solenoid valve is controlled based on the sensing of the combustion air pressure in the scavenging common chamber 6 by a pressure switch.

This conventional method requires an air cylinder unit (so-called air compressor), an air storage tank, an electric motor, compressed air piping, electric power, automatic control equipment, etc., resulting in high costs.

The present invention aims to improve these shortcomings and provide an economical valve device for low-speed internal combustion engines that is easy to operate, has few failures, and an embodiment thereof will be described below based on FIGS. 3 and 4. I will explain.

20 is a wall that partitions the scavenging common room 21 and the outside of the engine 22;
A seat 24 is attached so as to pass through a hole 23 provided at an arbitrary location.

Reference numeral 25 indicates a cylinder mounted on the seat 24 while being located within the scavenging common chamber 21, and 26 indicates a piston disposed within the cylinder.

A receiving plate 27 is disposed inside the piston 26, and a compression spring 28 is disposed between it and the receiving seat 24, and the piston 26 is biased in the projecting direction.

Reference numeral 29 is a coupling member that passes through the piston 26 and is integrated with the receiving plate 27, and an indicator 30 that can protrude to the outside of the engine 22 is connected to the outer end of the coupling member 29.

A diaphragm 31 covers the outer end of the piston 26, and its inner side is fixed to the joint member 29 via a link 32, and its outer side is clamped and fixed between the outer end of the cylinder 25 and the flange plate 33.

A portion of this diaphragm 31 that corresponds to the inner hole 34 of the flange plate 33 forms a pressure receiving surface of the piston 26 .

Furthermore, the combustion air has a high moisture content and there is a risk that the piston 26 will rust, but the diaphragm 31 serves to prevent the piston 26 from coming into contact with such an atmosphere.

35 is a valve seat frame provided on the partition wall between the scavenging common chamber 21 and the under piston chamber, 36 is a valve attached to the valve seat frame 35 via a shaft 3T so as to be openable and closable, and 38 is a stopper for regulating closing.

Reference numeral 39 denotes an arm rod connected to the valve 36 and connected to the joint member 29 via pins 40A, 40B and a rod 41 so as to be relatively swingable.

FIG. 3 shows the valve closed state in which the piston 26 is raised via the receiving plate 27 by the elastic force of the compression spring 28, and the valve 36 is rotated via the rod 41 until it comes into contact with the stopper 38.

In this state, as the rotational speed of the internal combustion engine increases and the horsepower increases, the pressure in the scavenging common chamber 21 increases.

This pressure is received by the diaphragm 31 through the inner bore 34, i.e. the piston 26, and thus presses the compression spring 28.
When a pressure higher than the set elasticity, for example, a pressure of 1 kg/cm 2 g, is applied, the piston 26 is moved downward by the elastic force of the compression spring 28.

This causes the valve 3 to pass through the rod 41 as shown in FIG.
6 is opened and moved.

Conversely, when the valve 36 is opened and the internal combustion engine's rotational speed drops and the horsepower drops, the pressure in the scavenging common chamber drops and the elastic force of the compression spring 28 is overcome by the pressure received by the diaphragm 31. Then, the valve 36 is closed as shown in FIG.

As described above, according to the present invention, when the rotation speed of the internal combustion engine is low, the valve can be closed by elastic force, and when the rotation speed is high, the valve can be automatically closed by the increasing combustion air pressure. There are fewer breakdowns for everyone who drives.
Not only can we provide an economical valve device for low-speed internal combustion engines, but the diaphragm can prevent moisture-rich combustion air from coming into contact with the pistons and cylinders, preventing the occurrence of rust. , valve operation outside the engine can be easily confirmed.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal cross-sectional view of a conventional example, FIG. 2 is a perspective view of the main parts thereof, and FIGS. 3 and 4 are longitudinal expanded explanatory views showing one embodiment of the present invention. 21...Scavenging common room, 25...Cylinder, 26...
・Piston, 2B...compression spring, 29...coupling material,
30... Indicator, 31... Diaphragm, 3
6...Valve, 41...Rod.

Claims (1)

[Scope of utility model registration request] A cylinder that communicates the scavenging common chamber with the outside of the engine through a through hole provided in the wall is installed on a wall that separates the scavenging common chamber and the outside of the engine in a low-speed internal combustion engine. A piston connected to a valve provided between two chambers of the low-speed internal combustion engine is provided, and the piston is biased toward the scavenging common chamber to close the valve, and the gas is supplied. A spring is provided that allows the piston to be displaced by the air pressure to open the valve when combustion air pressure acts on the piston, and a diaphragm is provided that covers the inner surface of the cylinder and the outer surface of the piston on the scavenging common chamber side, and further, A valve device for a low-speed internal combustion engine, characterized in that a rod-shaped indicator that can protrude outside the engine is linked to the piston.