JPS5977034A - Supercharging system internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce the unbalance moment of inertia of a piston for providing a compact and light engine by arranging a plurality of cylinders horizontally opposed to each other at both sides of a crank case to connect pistons in both cylinders to a crank shaft on the 180 deg. offsetted positions. CONSTITUTION:A plurality of cylinders 1, 2 are arranged horizontally opposed at both left and right sides of a crank case 3. And when pistons 51, 52 in both cylinders 1, 2 in the crank case 3 are connected through rods 121, 122 to crank pins 111, 112 of a crankshaft 10 journalled orthogonally to the axis of both cylinders 1, 2, both pins 111, 112 are offsetted 180 deg. from each other to interconnect both pistons 51, 52 such that said both p istons are reciprocatingly separated from each other after approaching each other. Thus, unbalance moment of inertia caused by the reciprocation of the pistons 51, 52 in both cylinders 1.2 and the balance weight of the crankshaft 10 are reduced to provide a compact and light engine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-stroke internal combustion engine in which the crankcase is configured as a compression and charging chamber for intake air for each cylinder.

In a piston-type internal combustion engine, the volume of the crankcase that houses the crankshaft increases and decreases due to the reciprocating motion of the piston, so this increase and decrease in volume is used to control the intake air in a 4-cycle engine. Supercharging by compressing the
No. 116], etc.

However, this prior art four-stroke internal combustion engine uses two cylinders with ignition orders shifted by 360 degrees into one cylinder.
By simultaneously reciprocating the pistons in the solid cylinder in the same direction, the suction that is drawn into the crankcase through the check valve when both cylinders are raised is When the air is lowered,
Since the pistons in both cylinders reciprocate in the same direction at the same time, the kinetic inertia against the reciprocating motion is significantly unbalanced, causing large vibrations in the engine. In order to eliminate the vibration caused by the unbalance of the kinetic inertia, it is necessary to install a large balance weight or a balance shaft, which increases the weight of the engine and significantly increases the size of the engine. there were.

In the present invention, as in the prior art described above, two cylinders are paired, and supercharging is alternately performed for each solid cylinder by increasing and decreasing the crankcase volume due to the reciprocating movement of histones in the solid cylinder. In a four-stroke internal combustion engine, the solid cylinders are arranged in a horizontally opposed manner with the crankshaft positions shifted by 1800 degrees, and a crankcase for accommodating the crankshaft is provided between the solid cylinders, and the histones of the solid cylinders are directed toward the crankcase. By configuring the histones to reciprocate so that they approach each other and then move away from each other, the unbalance of kinetic inertia caused by the reciprocating motion of the histones is reduced, making the engine smaller and lighter, and increasing the suction efficiency for the engine. This is aimed at improving supercharging efficiency.3. .

Next, an example of the present invention will be explained with reference to the drawings. Siri?7ri(4,)(4,), said Siri, 17
Histonia (51) (5,) reciprocating in the tank, intake port (61) C6,) with intake valve (7,) (7,), and exhaust boat (81) with exhaust valve (9K) (9,). )(8
), and histones (5
, ) (52) is pivotally supported in the crankcase (3) in a direction perpendicular to the axis of the solid cylinder (101). □) When connecting via (12,), both crank pins J (121) and (122) are shifted by 180°, and the thrusts of solid cylinder fil (2): J (5t) (5g) are close to each other. After that, it is configured to reciprocate away from each other, and the left side 1g1
When cylinder (1) is on the explosion stroke, the second cylinder on the right side (2) is on the intake stroke, and when cylinder 11 is on the exhaust stroke, the second cylinder (2) is on the compression stroke, and the first cylinder (1) is on the intake stroke. The second cylinder (2) is configured to be in the explosion stroke during the stroke, and the second cylinder (2) is in the exhaust stroke when the first cylinder (1) is in the compression stroke.

Then, connect the re-unk case (3) to the intake conduit (13,
) (1, 3,) to the solid cylinder fil (21), while the air intake passage 05 from the air cleaner Oa is connected to the rear case (3).
), and the intake passage α9 is provided with fuel supply means such as a carburetor α0 and a check valve αη that opens only from the carburetor (1ω to the crankcase (3)).

In this configuration, when the first cylinder (1) on the left side is in the exhaust stroke, the second cylinder (2) on the right side is in the compression stroke, and the solid cylinders (51) (5,) move away from each other. , since the internal volume of the crankcase (3) increases, air from the air cleaner (air cleaner) is sucked into the crankcase (3) via the carburetor and the check valve αη, and then the first air
When (1) is in the suction stroke and @2 cylinder (2) is in the explosion stroke, the histonia (5,) (5,) of the solid cylinder move closer to each other and the internal volume of the crankcase (3) is reduced. After a short while, the intake air that was previously drawn into the crankcase (3) is forced into the first cylinder (1). Also, the first cylinder (
5 when 1) is in the compression stroke and the second cylinder (2) is in the exhaust stroke.
-4 The action of sucking air into the crankcase (3) and then force-feeding the intake air in the crankcase (3) to the second cylinder when the first cylinder is in the explosion stroke and the second cylinder is in the intake stroke is repeated. Yes, in this case, the increase in the internal volume of the crankcase (3) is twice the stroke volume in one 1jLft1, and after sucking in approximately the same amount of air, it pumps itself into one cylinder. The intake air to the solid cylinder is compressed and supercharging is performed.

Then, the same stroke (5 m
) (5,) is a solid cylinder (11:2+) with a crankcase (
3), the kinetic inertia of one histone is the same as that of the opposite histone. In balance with the kinetic inertia of the other body moving in the direction,
Since both kinetic inertias cancel each other out, the first-order unbalance of kinetic inertia regarding the reciprocating motion of both pistons no longer occurs, and a balance weight or balasis is used to eliminate the first-order inertial unbalance regarding the reciprocating motion of the histones. Since the shaft can be abolished, the solid cylinder is also ((2)
The crankcase (3) is arranged horizontally opposite to the crankcase (3), and the crankcase (3) is also used for the solid cylinder, and the middle dimension of the rear case (3) in the crankshaft direction is (1) I/'i is shorter than when two cylinders are arranged side by side in the crankshaft direction with respect to the crankcase as in the prior art described above, and the pistons in both cylinders are at bottom dead center. At this time, the internal volume of the crankcase, the volume of the gap at the beginning of suction, and at the time of compression line are smaller than in the prior art, so the compression ratio of the intake air in the crankcase can be increased.

In the above embodiment, a fuel supply means such as a carburetor (161) was provided in the intake passage (5) from the air cleaner a (to the crankcase (3)), but the fuel supply means was provided in the intake passage α0. Instead of providing an intake pipe (13,
In addition, both cylinders fl arranged horizontally opposite to the crankcase (3) may be provided in the
) +21 as one pair, ・By arranging multiple pairs in the axial direction of the -wooden crankshaft, 4 cylinders or 6 cylinders
This makes it easy to create an engine with an even number of cylinders.

The above invention provides a four-stroke internal combustion engine in which air taken into a crankcase having two cylinders is alternately pumped to both cylinders. The pistons in both cylinders are arranged horizontally opposite each other, and the crankshaft positions are shifted by 180 degrees so that the pistons in both cylinders move reciprocally toward the crankshaft in the crankcase, so that the pistons approach each other and then move away from each other. Because they are connected, there is less unbalance of kinetic inertia due to the reciprocating movement of the same cylinders in both cylinders, and the balance weight on the crankshaft can be reduced by this amount, or the balance shaft can be eliminated, so the engine Since the engine can be significantly reduced in size and weight, the compression ratio of the intake air in the crankcase is also high, which has the effect of significantly improving the intake efficiency and supercharging efficiency for the engine.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical front view, and FIG. 2 is a sectional view taken along the line 1--2 of FIG. +1) +2)... Cylinder, (3)... Crankcase, (5,) (52)... Same position, flol-°°
Classic shaft, (ll,)l (112)... crankbishi, 041... air cleaner, +151... intake passage. Patent applicant: Taihatsu Kogyo Co., Ltd.

Claims (1)

[Claims] (1) In a four-stroke internal combustion engine in which air taken into a crankcase having two cylinders is alternately pumped to the solid cylinders, the solid cylinders are horizontally opposed to each other on both left and right sides of the crankcase. On the other hand, the histonia in the solid cylinder is connected to the crankshaft in the crankcase with the position of the histonia shifted by 180 degrees so that both pistons move closer to each other and then move away from each other. A supercharged internal combustion engine.