JP2012241704A - Four-cycle reciprocating engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem regarding a multi-valve engine whose configuration improves its exhaust efficiency and whose circular cylinder has three or more similarly circular intake/exhaust ports, that an increase in the number of the intake/exhaust ports reduces the area of each of the intake/exhaust ports and limits their numbers, and additionally an increase in the number of valves increases the number of components including springs, valves, cams and cam shafts and labor charges and requires more power for driving these as well.SOLUTION: This four-cycle engine uses one valve for intake/exhaust operations. Thus, it can be very simply and inexpensively manufactured with a smaller number of components.

Description

  The present invention relates to a four-cycle reciprocating engine that performs intake and exhaust with a single valve.

  A four-cycle reciprocating engine creates a sealed space with a cylinder and a piston, and generates power by vigorously burning and exploding fuel inside. The initial SV engine is wide, and the OHV engine that uses a push rod to drive the cam is not suitable for relatively high rotations because the length of the long push rod changes due to heat.

  Therefore, an OHC was devised that opens and closes the valve directly with a cam. However, the resistance of intake and exhaust increases as the engine speed increases. In order to improve the intake / exhaust efficiency, it has been transformed into a WOHC, so-called multi-valve engine, in which the intake / exhaust ports at one location are further increased to one location or more, a total of three locations or more.

  To increase the output of a reciprocating engine, it is possible to increase rotation, reduce sliding resistance, and improve intake and exhaust efficiency.

  The multi-valve engine is designed to improve the intake and exhaust efficiency. By increasing the number of valves, the area of the intake and exhaust ports was increased and the intake and exhaust efficiency was improved. However, by providing a plurality of the same circular intake / exhaust ports in a circular cylinder and increasing the number thereof, the area of each intake / exhaust port is reduced, and the overall area is limited. Moreover, as the number of valves increased, the engine cost, valves and camshafts increased, and the driving force for driving them increased.

  Intake and exhaust are combined with a single valve.

  As a result, an intake / exhaust port having a size close to the diameter of the cylinder can be provided, and accordingly, the intake / exhaust efficiency can be improved, and the number of parts, labor cost, and driving force can be reduced.

  It is side surface sectional drawing of this invention   FIG. 4 is a plan view of another arrangement of the valve of the present invention.   FIG. 6 is a plan view of other conventional valves of a multi-valve engine.

  The sliding and rotating parts are the conventional four-cycle engine itself, but the position of the ignition device (4) and the fuel injection device (5) is limited because one large valve occupies the central part.

  The intake / exhaust port (3) has a circular shape as large as possible, and an intake / exhaust valve (2) matching it is provided, fixed by a spring (8) as before, and rotated by a camshaft (11). The combustion chamber (12) in the cylinder (1) is opened or sealed by the action of the cam (10). The ignition device (4) and the fuel injection device (5) are arranged at arbitrary positions where the respective functions can be performed.

  Since it is a 4-cycle engine, it starts with intake. Until the piston (9) reaches the bottom dead center from the top dead center through the intake / exhaust valve (2) opened by being pushed down by the cam (10) by the rotation of the cam shaft (11) interlocked with the crankshaft (14). Air is sucked into the combustion chamber (12) by a device for forcibly circulating air from the intake port side to the combustion chamber (12) and exhaust port side. When the piston (9) reaches bottom dead center, the intake / exhaust valve (2) is closed. As the crank (15) rotates as it is due to inertia, compression starts in the combustion chamber (12). Explosion and expansion start by injecting fuel from the fuel injection device (5) at any time when the piston (9) is rising, and then igniting by the ignition device (4). High pressure gas without escape from the combustion chamber (12) pushes down the piston (9). This action moves the crank (15) via the connecting rod (13) to rotate the crankshaft (14), and this rotational motion becomes power. When the piston (9) reaches bottom dead center, the intake / exhaust valve (2) is now opened. As the piston (9) rises and the volume of the combustion chamber (12) is reduced, the exhaust is pushed out of the engine from the exhaust port (7) by the air blown from the intake port (6) by the attached device.

  During exhaust and intake, the crankshaft (14) rotates once. During this time, the intake / exhaust valve (2) is opened, and the intake / exhaust valve (2) is closed for one rotation during compression and explosion. Accordingly, the crankshaft (14) makes two revolutions and the camshaft (11) makes one revolution in one stroke of four cycles of suction, compression, explosion and exhaust. The ignition device (4) can be applied to a diesel engine with a slight change such as replacing the ignition device (4) with a preheating device.

  The availability of a 4-cycle reciprocating engine is well known.

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Intake / exhaust valve 2A Intake valve 2B Exhaust valve 3 Intake / exhaust port 4 Ignition device 5 Fuel injection device 6 Intake port 7 Exhaust port 8 Spring 9 Piston 10 Cam 11 Cam shaft 12 Combustion chamber 13 Connecting rod 14 Crank shaft 15 Crank 16 Lubrication oil

Claims (2)

  A 4-cycle reciprocating engine that uses only one valve for intake and exhaust.   The engine according to claim 1, further comprising a device for forcibly circulating air from the intake port side to the exhaust port side.

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