JP2571707Y2 - 4-stroke piston engine with explosion and exhaust strokes longer than suction and compression strokes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a four-stroke piston engine with improved stroke.

[0002]

2. Description of the Related Art Conventionally, in a 4-cycle piston engine,
During each of the suction-compression-explosion-exhaust strokes, the piston makes two reciprocations between top dead center and bottom dead center, and the crankshaft moves two
The only thing that the piston does during the rotation is the explosion stroke. However, in the conventional engine, the piston stroke has the same stroke length as the reciprocating stroke for intake / compression and the reciprocating stroke for explosion / exhaust. Therefore, the piston can effectively work only 1/4 stroke out of two reciprocations. , Loss is large and efficiency is low.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in view of the above-mentioned problems. It is an object of the present invention to provide a four-cycle engine capable of solving the problem.

[0004]

In the four-stroke piston engine of the present invention, a base end of a piston rod is fixed to a fixed sun gear, a planetary gear rotating around the sun gear, and an internal gear meshing with the planetary gear. The planetary gear mechanism consisting of gears is pivotally attached to a link fixed to the planetary gear, and the linear reciprocating motion of the piston is converted into the rotational motion of the internal gear by the planetary gear mechanism, thereby sucking the explosion and exhaust strokes -The above problem was solved by a configuration characterized by making the length longer than the compression stroke.

[0005]

The sun gear of the planetary gear mechanism is fixed, and when the planetary gear rotates around the sun gear, if a point fixed to the planetary gear is outside the pitch circle of the planetary gear, the locus drawn by that point is a Cartesian・ It becomes a trochoid and becomes a cycloid if it is on the pitch circle. Therefore, when the base end of the piston rod is pivotally connected to a fixed point of the planetary gear, the base end also traces the same trajectory as described above, and accordingly, the stroke of the linear reciprocating motion of the piston is regulated. . Now, as shown in FIG. 4, if the number of teeth and the pitch diameter of the sun gear and the planetary gear are made equal and the number of teeth and the pitch diameter of the internal gear are set to double, respectively, while the planetary gear makes one revolution, , The planetary gear rotates twice and the internal gear rotates 1.5 times.
When the outer point P (distance s from the center of the planetary gear) fixed to the planetary gear is taken on a line connecting the center of the planetary gear just above the sun gear and meshing with the sun gear, the locus is shown in FIG. A curate trochoid curve m as shown in (b) is obtained. Therefore, when the piston rod proximal end is pivotally connected to the point P, the piston is at the top dead center e when the point P is at the point a in the figure, and gradually descends from this position with the rotation of the planetary gear, and b At the point, the piston reaches the first bottom dead center f, further rises there, reaches the point c at the same height as the point a again, reaches the top dead center e, and descends therefrom to reach the point d. The piston reaches the second bottom dead center g in the descending position and rises from there to reach the point a to become the top dead center e, during which the piston makes two reciprocations. Therefore, the suction stroke between a and b (ef), the compression stroke between b and c (fe), and cd (e-
g) is an explosion stroke, and d-a (ge) is an exhaust stroke, the explosion stroke and the exhaust stroke are 2D (D is the pitch diameter of the sun gear and the planetary gear) more than the suction stroke and the compression stroke. Can be longer. That is, the stroke of the explosion stroke for working outside can be made longer than the suction stroke and the compression stroke, and an efficient four-cycle engine can be obtained.

As shown in FIG. 4B, the stroke of the piston can be adjusted by adjusting the distance of the point P from the center point of the planetary gear, and the pitch diameter of the planetary gear and the sun gear can be changed. Thereby, the difference between the explosion stroke and the exhaust stroke and the suction stroke and the compression stroke can be adjusted. The rotation of the internal gear is taken out as the rotation of the output shaft that meshes with and transmits to the gear, and the rotation speed of the output shaft can be controlled by changing the ratio of the numbers of both teeth.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows a main part of the piston engine of the present embodiment. In the drawing, reference numeral 1 denotes a piston which reciprocates in a cylinder (not shown), and a base of a piston rod 3 pivotally mounted on a piston pin 2 has a planetary gear. It is connected to a rotary motion converter 5 composed of a mechanism. The rotary motion converting device 5 includes a ring gear 8 having outer teeth 6 and inner teeth 7 formed on an outer peripheral surface and an inner peripheral surface, a sun gear 9 fixed to a center portion thereof, the sun gear 9 and the inner teeth. 7 and a pair of planetary gears 10 meshing with each other are provided.
The output gear 15 is configured to mesh with the external teeth 6 of the planetary gear mechanism. The number of teeth and the pitch diameter of the sun gear 9 and the planetary gear 10 are the same, and the internal teeth 7 of the ring gear 8 have twice the number of teeth and the pitch diameter.

A link 11 corresponding to a crank arm of a conventional piston crank mechanism is fixed to the planetary gear 10 as shown in the figure, and a pin 12 provided between the links is connected to a base end of the piston rod 3. The part is pivoted. This embodiment shows a case where the distance between the axis of the pin 12 provided on the link 11 and the axis of the planetary gear 10 is set to 0.75D (D is the pitch diameter of the planetary gear).

The piston engine 4 constructed as described above
The cycle process will be described with reference to FIG. First, the figure (a)
When the piston 1 is at the top dead center e, the ring gear 8 is rotating due to the inertia of the explosion in this state.
When the sun gear 9 rotates clockwise in the figure, the link 11 also rotates together with it, and the piston 1 also descends with it, and when the planetary gear 10 reaches a point located exactly on the piston axis. Then, the tip of the link 11 has just reached the lower end in the axial direction of the piston, and the state shown in FIG. 2B is reached, the piston 1 reaches the first bottom dead center f, and the suction process ends. When the planetary gear 10 further rotates from this state, the link 11
Gradually rises, and accordingly, the piston 1 starts rising and the compression stroke starts. Planet gear 10 is 90 ° from top dead center
While not rotating, the piston 1 reaches the top dead center e, and then enters the explosion stroke slightly after the top dead center. When the piston 1 is pushed down by the explosion, the planetary gear 1
0 also rotates, and reaches the second bottom dead center g, which is the lowest point. The position of the pin 12 of the link 11 at that time is also the lowest point. Therefore, the stroke of the explosion stroke is two times greater than that of the suction stroke.
It becomes longer by D. Then, when the planetary gear 10 is further rotated, the exhaust stroke starts, and the state of (a) is reached and the exhaust stroke ends. Hereinafter, such repetition is performed.

FIG. 4B shows that the distance s between the pin of the link 11 and the center of the planetary gear in the above embodiment is 1.5D.
In this embodiment, each stroke is longer. By adjusting the distance s in this manner, the stroke length can be arbitrarily adjusted, and by changing the pitch diameter of the sun gear and the planetary gear,
The difference in stroke length between the explosion and exhaust strokes and the suction and compression strokes can be adjusted.

[0011]

[Effects of the Invention] The present invention has the above configuration,
In a four-stroke piston engine, the explosion stroke and the exhaust stroke can be made longer than the suction stroke and the compression stroke. Therefore, the stroke of working outside is long, and the stroke of consuming energy without working becomes short. Energy efficiency is improved accordingly. Further, the reciprocating linear motion of the piston is directly converted into rotary motion by the planetary gear mechanism, and can be directly changed to the rotation speed of the output shaft by changing the ratio of the number of teeth to the output shaft, which is efficient.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a stroke of a piston engine according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of the piston engine according to the embodiment of the present invention.

3A is a partial cross-sectional front view of the piston engine in a state at a second bottom dead center, and FIG. 3B is a partial cross-sectional front view in a state at a first bottom dead center.

FIG. 4 is an explanatory diagram of the operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Piston 2 Piston pin 3 Piston rod 5 Rotational motion conversion device 8 Ring gear 9 Sun gear 10 Planetary gear 11 Link 12 Pin 15 Output gear

Claims (1)

(57) [Scope of request for utility model registration] In a four-cycle piston engine, a piston rod proximal end is provided with a fixed sun gear, a planetary gear rotating around the sun gear, and an internal gear engaged with the planetary gear. The explosion / exhaust stroke is made longer than the suction / compression stroke by pivotally connecting to a link fixed to the planetary gear and converting the linear reciprocating motion of the piston into the rotational motion of the internal gear by the planetary gear mechanism. A four-cycle piston engine characterized by: