JPH10280921A - Rotary type valve open/close device for four cycle engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase intake/exhaust efficiency and also simplify an intake/ exhaust device by storing a rotary cylinder in a cylinder and overlapping the intake/exhaust ports of a cylinder head to the intake/exhaust common port of a rotary cylinder head and carrying out the intake/exhaust at the intake/ exhaust process time. SOLUTION: Four intake ports 7 and four exhaust ports are provided on the head of a cylinder 4 at 90 deg. angle interval and also a rotary cylinder 5 provided with four intake/exhaust common ports 3 on the head is inserted in this cylinder 4. By rotating this rotary cylinder 5 and overlapping the intake/exhaust common port 3 properly to the intake port 7 and exhaust port, the intake/ exhaust are carried out at four places. In this rotary cylinder 5, by inserting a piston 2 vertically and movably and meshing a rotary cylinder gear 11 with an idling gear 12 meshed with a gear 13 on a crank shaft 6, the crank shaft 6 and the rotary cylinder 5 are rotated communicatingly at the ratio of 8:1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for opening and closing a rotary valve of a four-cycle engine.

[0002]

2. Description of the Related Art In a conventional valve opening / closing device for a four-stroke engine, an intake port and an exhaust port are opened and closed by moving a piston valve up and down by a camshaft to perform intake and exhaust.

[0003]

In a conventional valve opening / closing device for a four-stroke engine, an intake port and an exhaust port are opened and closed by rotating a camshaft and vertically moving a piston valve. The intake port and exhaust port are narrow, so the intake port and exhaust port near the beginning and end are also narrowed, which makes the intake and exhaust efficiency worse, and the valve head also makes the intake and exhaust ventilation efficiency worse. In order to solve the problem, the number of valves is increased or a variable valve is used, but this has a problem that the apparatus becomes complicated.

An object of the present invention is to improve the intake and exhaust efficiency of a four-stroke engine and to simplify the intake and exhaust systems.

[0005]

In order to achieve the above object, a rotary valve opening / closing apparatus according to the present invention comprises a rotary cylinder inscribed in a cylinder, and a cylinder head having four intake ports and four exhaust ports. The rotary cylinder is provided with four intake / exhaust ports, and the gear provided on the crankshaft and the gear provided on the rotary cylinder skirt are used to rotate the crankshaft and the rotary cylinder in an eight-to-one ratio for intake. During the stroke and the exhaust stroke, the intake and exhaust ports are set so that the intake and exhaust ports of the cylinder head and the intake / exhaust port of the rotary cylinder head overlap each other.

When the crankshaft gear and the rotary cylinder skirt gear cannot be directly meshed with each other because the crankshaft and the rotary cylinder are interlocked and rotated at an eight-to-one ratio, an idling gear may be interposed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, the intake stroke is started from the exhaust stroke end stroke. Four intake ports 7 and four exhaust ports 8 are provided at the head of the cylinder 4, and a rotary cylinder 5 The rotary cylinder 5 is rotated by rotating the rotary cylinder 5 so that four inlets 7 and four outlets 8 of the head of the cylinder 4 are provided.
The four intake / exhaust ports of the head of the rotary cylinder 5 are overlapped at the four locations, and four strokes are performed four times with one rotation of the rotary cylinder 5 to achieve intake,
Exhaust can be performed in four places.

In FIG. 2, the crankshaft 6 is rotated by the vertical movement of the piston 2 and the crankshaft gear 1 is about to enter the intake stroke from the exhaust stroke end stroke.
3 also rotates, the rotary cylinder gear 11 is rotated by the idling gear 12, and the crankshaft 6 and the rotary cylinder 5 are interlockedly rotated at an eight-to-one ratio.
During the intake and exhaust strokes, intake and exhaust can be performed by overlapping the cylinder head intake port 7 and exhaust port 8 with the rotary cylinder intake / exhaust port 3.

When the intake port and the exhaust port overlap, there is a doubt about the ventilation efficiency. However, it is considered that the problem can be sufficiently solved by devising the cylinder section intake port, the exhaust port, the piston head and the like.

Although there is a question about airtightness, when airtightness is required, the intake and exhaust ports of the cylinder part and the rotary cylinder intake / exhaust port are located in the middle of each other. It is thought that the problem can be solved sufficiently by using a ring-shaped material for the plug port of the cylinder and the rotary cylinder intake / exhaust port, and replenishing the oil.

[0011]

Since the present invention is configured as described above, it has the following effects.

The intake port and the exhaust port are well balanced, the area of the intake port and the exhaust port are widened, and the opening and closing ports near the initial and final stages are also widened, so that the intake and exhaust efficiency is increased,
It can handle a wide range of engine speeds and achieve high torque, high output, and low fuel consumption.

Since there is no valve head, the ventilation efficiency of intake air and exhaust gas is increased, and exhaust gas can be cleaned.

Since the area of the intake port and the exhaust port is widened, and the opening and closing ports near the initial and final stages are also widened, the load on the piston is reduced during intake and exhaust, torque is improved, high output and low fuel consumption are achieved. Can be achieved.

[0015] Since the area of the intake port and the exhaust port is widened, and the opening and closing ports near the initial and final stages are also widened, the opening of the exhaust port can be delayed. High output and low fuel consumption can be achieved.

The number of parts is small, the apparatus is simple, and downsizing, weight reduction and cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a front view of a simple four-cycle engine rotary valve opening / closing device.

FIG. 2 is a cross-sectional view of a simple four-cycle engine rotary valve opening / closing device AA.

FIG. 3 is a front view of a simple four-cycle engine rotary cylinder.

[Explanation of symbols]

 Reference Signs List 1 plug 2 piston 3 intake / exhaust port 4 cylinder 5 rotary cylinder 6 crankshaft 7 intake port 8 exhaust port 9 piston pin 10 lot 11 rotary cylinder gear 12 idling gear 13 crankshaft gear 14 plug port

Claims (1)

[Claims] 1. A rotary cylinder (5) is inscribed in a cylinder (4), an intake port (7) and an exhaust port (8) are provided in the cylinder (4), and an intake / exhaust port (3) is provided in the rotary cylinder (5). ), The rotary cylinder (5) is rotated in conjunction with the crankshaft (6), and the intake port (7) and the exhaust port (8) of the cylinder (4) are connected to the intake / exhaust port (8) of the rotary cylinder (5). 3) Rotary valve opening / closing device for a four-stroke engine that performs intake and exhaust by overlapping 3).