JPS62214220A - Uniflow scavenging diesel engine - Google Patents

Abstract

PURPOSE:To control scavenge timing and to improve an output, by providing a control ring, which reciprocates in a phase different from that of a piston, between a cylinder liner and the piston. CONSTITUTION:In a uniflow scavenging engine, which provides scavenge ports 3a in the bottom of a cylinder liner 3 being equipped with an exhaust hole providing an exhaust valve 9 in the top part, a control ring 2 is provided between a piston 1 and the cylinder liner 3. The control ring 2 reciprocates being driven by a crankshaft which reciprocates the piston 1. The control ring 2 is reciprocated in a phase with a delay of about 45 deg. from that of the piston. In this way, the scavenge ports 3a are provided from opening before the piston 1 sufficiently reaches the bottom dead center, and the engine sufficiently converts combustion energy into an output while prevents a scavenge flow from escaping with exhaust.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-stroke Uniflow clean-air diesel engine.

[Conventional technology]

In the conventional uniflow scavenging diesel engine, a piston slides on the cylinder liner surface, and the piston opens and closes the scavenging hole. It was necessary to open the exhaust valve a little earlier than the scavenging hole opening time, and the effective stroke of the two engines ended when the pistons were far above.

[Problem that the invention seeks to solve]

The purpose is to create a structure that maximizes the effective stroke of the engine and maintains the amount of air supplied, that is, to extend the period during which the piston performs work without changing the combustion state of the engine. That is, since more output is obtained with the same combustion, the fuel consumption of the engine per horsepower per hour is reduced.

[Means to solve the problem]

The present invention has been made with attention to the above points, and its characteristic feature is that the cylinder liner is slidably interposed between the cylinder liner and the piston, is interlocked with the crankshaft, and is mounted under the piston. It is important to prepare a control ring that opens the scavenging hole when the engine reaches dead center and delays the opening of the exhaust valve.

[Effect]

In the above case, the control ring is configured to open the scavenging port when the piston reaches the bottom dead center. Note that the exhaust valve needs to be opened a certain amount before the scavenging port opens.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an engine according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing the piston, control ring, crosshead, and crankshaft of the engine shown in FIG. 1.

FIG. 3 is a diagram showing the movement of components according to the invention.

1 and 2, a control ring 2 is provided between a piston 1 and a cylinder liner 3, the piston 1 slides on the inside of the control ring 2, and the control ring 2 slides on the inside of the cylinder liner 3. It shall be a mechanism.

The control ring 2 also includes a control ring rod 5 similar to the piston rod 4.
is installed, cross head 11° connecting rod 1
3 to the crankshaft 15. However, the angle of the crank is slightly delayed from that of the piston 14. Piston rings are provided on the outer periphery of the piston 1 and the outer periphery of the control ring 2, respectively. In addition, 6 and 7 are gland i9 sockets, 8 is a cylinder cover, l (1: cross spatula)', and 12H connecting rod.

The states of the piston 1, the control ring 2, the scavenging port 3a, and the movement of the exhaust valve 9 are diagrammatically shown in FIG. piston 1
reaches bottom dead center (BDC).

The control ring 2 opens the scavenging port 3a.

A little before that, exhaust valve 9 was opened (EV
O). The exhaust valve 9 can be delayed to such an extent that blowback does not occur when the scavenging port 3a opens.

If blowback occurs after a longer delay, it will have a negative effect on the a performance.

In addition, in this mechanism, on the piston l side and the control ring 2 side,
It is also possible to change the connecting rod ratio (ratio of connecting rod 13 and crank radius). Furthermore, the control ring also transmits power when descending. Further, even after the piston 1 enters the downward stroke, the control ring 2 rises, but the combustion chamber volume must be configured to expand.

〔Effect of the invention〕

The above case has the following effects.

Since the maximum effective stroke of the engine is obtained and the area for scavenging and exhaust is sufficient, good combustion occurs, and the energy received by the piston from a certain amount of fuel and converted into work is maximized, and the same When performing work, the fuel consumption rate is the lowest.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an engine according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing the piston, control ring, crosshead, and crankshaft of the engine shown in FIG. 1. FIG. 3 is a diagram showing the movement of components according to the invention. 1...Piston, 2...Control ring, 3...Cylinder liner, 3a...Scavenging hole, 4...Piston rod,
5... Control ring rod, 9... Exhaust valve, 10.11.
...Cross spatula l', 12.13...Konro l',
14.15...Crankshaft. 9...+11i'ipo゛

Claims (1)

[Claims] 1. A control ring is slidably interposed between the cylinder liner and the piston and is linked to the crankshaft, opening the scavenging hole when the piston reaches the bottom dead center and delaying the opening timing of the exhaust valve. Uniflow scavenging diesel engine.