JPH0467004B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a four-stroke engine.

(Prior art) Conventionally, in this type of engine, a spark plug is provided in the center of a head cover that has an exhaust hole and an intake hole, and a bowl-shaped spark plug is provided with a hole in the upper (outside) side of the head cover that rotates by a gear drive. A four-cycle engine in which the exhaust manifold and intake manifold are mounted on top of the bowl-shaped gear, with the gear held down with a metal fitting so that it does not fall off, with the manifolds facing the exhaust hole and intake hole, is specially designed. It is disclosed in Japanese Patent Publication No. 16214/1983.

(Problems to be Solved by the Invention) The four-cycle engine described in the above-mentioned prior art has a configuration in which the bowl-shaped gear is held down with a metal fitting so that it does not fall off, resulting in poor rotational stability. The exhaust manifold and intake manifold are installed on top of the gear so that these manifolds face the exhaust hole and intake hole, and the tightness (airtightness) between the rotating bowl-shaped gear and the non-rotating manifold is important. There are deficiencies such as difficulty in obtaining.

An object of the present invention is to provide a new four-cycle engine that is designed to solve the above-mentioned defects.

(Means for Solving the Problems) In order to achieve the above object, the four-stroke engine of the present invention has a piston 2, a crankshaft 3, a crank 4, and a link 5 built into the cylinder 1, and An inner head cover 6 and an outer head cover 7 are screwed on and disassembled to form a thin disc-shaped sealed space 8 on the top surface of the cylinder 1, and shaft holes 19, 19' are formed in the center of the inner head cover 6 and outer head cover 7. Furthermore, a rotary plate 9 is rotatably inserted into the space 8, and a pipe-shaped central shaft 9' is provided at the center of the rotary plate 9.
are integrally provided so that the upper and lower ends of the central shaft 9' are rotatably supported in the shaft holes 19, 19', and a shaft is provided in the inner diameter hole 20 of the central shaft 9' to prevent rotation of the central shaft 9'. A fixed shaft 18 is provided with the spark plug 15 facing downward, and a driven gear 13 is cut on the outer circumference of the rotary plate 9, and a driving gear 14 is connected to the driven gear 13. One communication hole 10 is provided at the eccentric location of the rotary plate 9 while meshing with the rotary plate 9.
In addition, an upper and lower pair of intake ports 11, 11' and an upper and lower pair of exhaust ports 12, 12' are provided in the inner head cover 6 and outer head cover 7 at locations corresponding to the locus of the communication hole 10, respectively. In the 1/4 rotation phase of the rotary plate 9, it overlaps with the intake ports 11, 11', and in the 4/4 rotation phase, it overlaps with the exhaust ports 12, 12', 2/
In the 4,3/4 rotation phase, there is a discrepancy between the intake ports 11, 11' and the exhaust ports 12, 12'.
11', and the exhaust ports 12, 12' are intended to be closed.

(Embodiment) The first embodiment shown in FIGS. 1 and 2 and the second embodiment shown in FIGS. 3 and 4 include a cylinder 1, a piston 2, a crankshaft 3, a crank 4, and a link 5. The cylinder 1 is covered with an inner head cover 6 and an outer head cover 7, a thin disc-shaped sealed space 8 is provided on the top surface of the cylinder 1, and a rotating plate 9 is inserted into this space 8 to close the rotating plate 9. Center the inner and outer head covers 6 and 7 above.
is rotatably supported by a pipe-shaped central shaft 9',
A communication hole 10 is provided at an eccentric location of the rotary plate 9, and an upper and lower pair of intake ports 1 are provided at locations corresponding to the locus of the communication hole 10 in both the inner and outer head covers 6, 7.
1, 11' and a pair of upper and lower exhaust ports 12, 12' are opened, and a driven gear 13 is cut on the outer circumference of the rotating plate 9, and a driving gear 14 is meshed with this driven gear 13. A spark plug 15 is attached to the rotary plate 9 through a fixed shaft 18 so as not to interfere with the rotation of the rotary plate 9, and when the communication hole 10 is in the 1/4 rotation phase of the rotary plate 9, it is connected to the intake port 11, In the 4/4 rotation phase, it overlaps with the exhaust ports 12, 12', and in the 2/4 and 3/4 rotation phases, it overlaps with the intake ports 11, 11' and the exhaust ports 12, 12', and these two overlap. The opening is closed, and the spark plug 15 is connected to the rotating plate 9.
is designed to fire when the piston 2 is in the upper position in the 3/4 rotation phase.

As is clear from FIGS. 5 to 9, the operation of the four-cycle engine according to the present invention is such that the rotating plate 9 is in a 1/4 rotation phase and the crank 4 is in a 1/2 rotation phase.
When entering the rotation phase, the rotary plate 9 performs the suction stroke by 2/4
When the rotation phase occurs and the crank 4 is in the 2/2 rotation phase, the compression stroke is performed, and when the rotation plate 9 is in the 3/4 rotation phase and the crank 4 is in the 3/2 rotation phase, the explosion stroke is performed. becomes 4/4 rotation phase and crank 4
When it reaches the 4/2 rotation phase, it constitutes an exhaust stroke.

(Function) In the four-cycle engine according to the present invention, the rotating plate 9 has a pipe-shaped central shaft 9' at its center, and both upper and lower ends of the central shaft 9' are supported by the outer head cover 7 and the inner head cover 6. Since the rotation operation is stable, and the outer head cover 7 provided above the rotary plate 9 is in a fixed state that does not rotate, the manifolds 21 and 21 for the intake port 11 and the exhaust port 12 provided in the outer head cover 7 are stable. ' can be easily connected in an airtight state.

(Effects of the Invention) As described above, the present invention has a piston 2, a crankshaft 3, a crank 4, and a link 5 built into the cylinder 1, and an inner head cover 6 and an outer head cover 7 that can be disassembled by screws on the top surface of the cylinder 1. A thin disk-shaped sealed space 8 is formed on the top surface of the cylinder 1 by covering the cylinder 1, and an inner head cover 6 is also formed.
and a shaft hole 19,1 in the center of the outer head cover 7.
9' is opened, and a rotary plate 9 is rotatably inserted into the space 8, and a pipe-shaped central shaft 9' is integrally provided at the center of the rotary plate 9, and both upper and lower ends of the central shaft 9' are connected. is rotatably supported in the shaft holes 19, 19', and a fixed shaft 18 is provided in the inner diameter hole 20 of the central shaft 9' in a manner that does not interfere with the rotation of the central shaft 9'. Since the spark plug 15 is fixed to the spark plug 18 with the downward direction, the rotational operation of the rotary plate 9 is stable, and one communication hole 10 is provided at an eccentric location of the rotary plate 9, and one communication hole 10 is provided in the inner head cover 6 and the outer head cover 7. Since the configuration has an upper and lower pair of intake ports 11, 11' and an upper and lower pair of exhaust ports 12, 12' at locations corresponding to the locus of the communication hole 10, the intake ports 11 and Manifold 2 for exhaust port 12
This has excellent effects such as making it easy to connect the parts 1 and 21' in an airtight manner.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the first embodiment of the present application, and FIG.
The figure is an exploded perspective view, FIG. 3 is a sectional view showing the second embodiment of the present application, FIG. 4 is an exploded perspective view of the main parts, FIG. 5 is an explanatory diagram of the suction stroke, and FIG. 6 is a compression stroke. FIG. 7 is an explanatory diagram of the explosion stroke, and FIG. 8 is an explanatory diagram of the exhaust stroke. 1...Cylinder, 2...Piston, 3...Crankshaft, 4...Crank, 5...Link, 6...
Inner head cover, 7... Outer head cover, 8
... Space, 9 ... Rotating plate, 9' ... Central axis, 10
...Communication hole, 11,11'...Intake port, 12,1
2'... Exhaust port, 13... Driven gear, 14... Drive gear, 15... Spark plug, 16, 16'...
Valve body, 17, 17'...cam, 18...fixed shaft,
19, 19'...Shaft hole, 20...Inner diameter hole, 21,
21'...Manifold.

Claims (1)

[Claims] 1 A piston 2, a crankshaft 3, a crank 4, and a link 5 are built into the cylinder 1, and an inner head cover 6 and an outer head cover 7 are mounted on the top surface of the cylinder 1 so that they can be disassembled by screws, and a thin disk is formed on the top surface of the cylinder 1. A hermetically sealed space 8 is formed, and shaft holes 19, 19' are formed in the center of the inner head cover 6 and outer head cover 7. A rotary plate 9 is rotatably inserted into the space 8, and the rotary plate 9 is rotated. A pipe-shaped central shaft 9' is integrally provided at the center, and both upper and lower ends of the central shaft 9' are rotatably supported in the shaft holes 19, 19', and the center is rotatably supported in the inner diameter hole 20 of the central shaft 9'. A fixed shaft 18 is provided in such a manner that it does not interfere with the rotation of the shaft 9', the spark plug 15 is fixed to the fixed shaft 18 in a downward direction, and a driven gear 13 is cut on the outer circumference of the rotary plate 9. A driving gear 14 is meshed with this driven gear 13, and one communication hole 10 is provided at an eccentric location of the rotating plate 9.
In addition, upper and lower pairs of intake ports 11, 11' and upper and lower pairs of exhaust ports 1 are located at locations corresponding to the locus of the communication holes 10 on the inner head cover 6 and outer head cover 7.
2 and 12' are opened respectively, and the communication hole 10 connects to the rotating plate 9.
At the 1/4 rotation phase of , it overlaps with the intake ports 11 and 11' and
In the 4th rotation phase, it overlaps with the exhaust ports 12, 12' and 2/4,
In the 3/4 rotation phase, there is a discrepancy between the intake ports 11, 11' and the exhaust ports 12, 12'.
A four-cycle engine characterized in that the exhaust ports 12 and 12' are closed.