JPH0417775Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a fluid supply mechanism to a reciprocating piston.

[Conventional technology]

For example, in a two-stroke crosshead diesel engine, a ram is used as a pressurized supply booster for lubricating oil and air to lubricate the crosshead and cool the pistons. A mechanism for converting the motion into reciprocating motion is known.

However, in this type of fluid supply mechanism to a reciprocating piston, the relative displacement due to the swing between the crosshead and coaxial bearing is small, so it is not possible to ensure a sufficient ram stroke, and furthermore, the ram is supplied via a mechanical link. Since the ram is driven, there is a problem in terms of pressurizing effect in supplying the crosshead bearing lubricating oil under pressure, and there is also a problem in that reliability is lowered due to the complexity of the ram drive mechanism.

[Problem that the invention attempts to solve]

The present invention was proposed in view of the above circumstances, and the object thereof is to provide a highly reliable and economical lubricating oil and cooling air supply mechanism to crosshead bearings and pistons.

[Means for solving problems]

To this end, the present invention is based on an air cylinder that extends parallel to the longitudinal direction of the piston rod fixed to a crosshead pin, a free ram that is slidably inserted into the air cylinder, and a reciprocating motion of the piston. and a flow path for supplying air or lubricating oil in the air cylinder compressed by the relative reciprocation of the free ram to the inside of the piston and the crosshead bearing.

[Effect]

With such a configuration, it is possible to obtain an economical lubricating oil and cooling supply mechanism to the crosshead bearing and piston, which has a simple structure, high reliability, and high reliability.

〔Example〕

An embodiment in which the present invention is applied to a two-stroke crosshead type diesel engine will be explained with reference to the drawings. Fig. 1 is an overall vertical sectional view showing the piston and crosshead, and Fig. 2 shows a modification of the crosshead shown in Fig. 1. FIG.

In the above figure, 1 is a free ram that is slidably inserted into a cylinder 2 that extends parallel to the longitudinal direction of the piston, and an intake hole 4 is opened in the center of the cylinder 2. The intake port is also open.

3 is a weight for adjusting the ram inertia built into the free ram 1, 5 is a bracket attached to the side of the crosshead pin 7 for fixing the cylinder 2, and 6 is a swing whose lower end is pivoted to the bracket 5. link, 8
is an air supply hole for communicating the upper chamber of the cylinder 2 to the piston 13 via the crosshead pin 7;
9 is bored in the crosshead pin 7 and the piston 1
3. A pressurized lubricating oil supply hole to the crosshead bearing 14; 10 is a hole bored in the bracket 5 to supply pressurized air and pressurized lubricating oil to the piston and crosshead;
11 is a check valve inserted into the upper chamber communication hole of the cylinder 2; 12 is a piston rod connecting the piston 13 and the crosshead pin 7; and 15 is a telescopic pipe.

In such a structure, the cylinder 2 containing the free ram 1 is attached to the crosshead pin 7 with a swing link 6 mounting bracket or a telescopic pipe 15.
It is fixed via a mounting bracket 5 or directly mounted alone.

Therefore, when the piston 13 moves up and down, the free ram 1 whose mass is appropriately adjusted repeats the up and down movement inertia at an appropriate speed.

As a result, the air inside the crankcase existing outside the crosshead pin 7 or the lubricating oil supplied at low pressure from outside the engine is pressurized each time the upward stroke is made, and the air is supplied to the air supply hole 8 to the piston or to the crosshead bearing. A pressurized lubricant supply hole 9 or pressurized air or pressurized lubricant supply hole 10 to the piston and crosshead is supplied.

As a result, in the case of air, pressurized air to the piston 8 or to the piston and crosshead is supplied via the pressurized lubricating oil supply hole 10 to the interior of the piston 13, and in the case of lubricating oil to the cross bearing. Pressurized lubricant is supplied to the inside of the crosshead bearing 14 or the piston 13 through the pressurized lubricant supply hole 9 or the pressurized air or pressurized lubricant supply hole 10 to the piston and crosshead, respectively.

At this time, these fluids are supplied by the check valve 11 without flowing back into the cylinder 2.

This structure has an extremely simple structure, does not require any other driving source, and can reduce speed.
By increasing the output and ensuring the cooling effect of the oil-cooled piston, which has severe operating conditions, and supplying lubricating oil to the crosshead bearing under pressure, it is possible to solve the major technical difficulties of large, low-speed crosshead type diesel engines.

[Effect of idea]

In short, according to the present invention, the air cylinder is fixed to the crosshead pin and extends parallel to the longitudinal direction of the piston rod, the free ram is slidably inserted into the air cylinder, and the reciprocating motion of the piston is used. By providing a flow path for supplying the air or lubricating oil in the air cylinder compressed by the relative reciprocating motion of the free ram to the inside of the piston and the crosshead bearing, the structure of the crosshead bearing and piston is simple and reliable. The present invention is extremely useful industrially because it provides an economical lubricating oil and cooling air supply mechanism with large quantities.

[Brief explanation of the drawing]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention applied to a two-stroke crosshead type diesel engine, and FIG. 2 is a partially enlarged view showing a modification of the crosshead shown in FIG. DESCRIPTION OF SYMBOLS 1... Free ram, 2... Cylinder for free ram, 3... Weight for adjusting ram inertia force, 4... Suction hole, 5... Bracket, 6... Swing link, 7...
...Crosshead pin, 8...Air supply hole, 9...
Pressurized lubricating oil supply hole, 10... Pressurized air or pressurized lubricating oil supply hole, 11... Check valve, 12... Piston rod, 13... Piston, 14... Crosshead bearing, 15... Telescopic pipe .

Claims (1)

[Scope of utility model registration request] An air cylinder fixed to the crosshead pin and extending parallel to the longitudinal direction of the piston rod, a free ram slidably inserted into the air cylinder, and the relative reciprocation of the free ram that occurs based on the reciprocating motion of the piston. 1. A fluid supply mechanism to a piston and a crosshead, comprising a flow path for supplying air or lubricating oil in the air cylinder compressed by the movement to the inside of the piston and the crosshead bearing.