JPS6021453Y2 - Cam chamber oil sump structure of internal combustion engine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cam chamber lubrication structure in high-speed diesel engines and the like.

In conventional mid- and low-speed diesel engines, there was no problem even if the bushing rod was a little long, but as the engine became higher speed, the tracking ability of the bushing rod became a problem, and in order to make the bushing rod as short as possible, it was conventionally placed in the crank chamber. The camshaft was moved upwards, and a separate cam chamber was created for lubrication.

The present invention relates to the configuration of the lubricating oil return passage of the cam chamber.

Conventionally, when there was a camshaft in the crank chamber, an oil passage was provided through the camshaft, and lubricating oil was flowed from the oil passage to each cam surface to lubricate each cam.

However, when a high-speed engine is used and the camshaft is bearing-supported in the cam chamber, it is difficult to penetrate the oil passage inside the camshaft. A lubrication method is also used in which the lubricating oil that is led into the cam chamber or flows out from the oil passage of the cylinder block 1 of the camshaft bearing section to the bearing section is collected in the cam chamber and used to lubricate the cam. be.

The present invention uses these methods to maintain the lubricating oil accumulated in the cam chamber at the minimum level necessary for lubrication.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall front sectional view of the diesel engine.

. Cylinder heads 3 corresponding to the number of cylinders are placed on the top surface of the cylinder block 1, and furthermore, a valve arm chamber 4 is placed on the top of the cylinder head 3.

Attach the oil pan 2 to the bottom of the cylinder block 1,
Lubricating oil comes out of the oil pan and returns to this oil pan after circulation.

A connecting rod is supported by a bearing on the crankshaft 12, and a piston 7 is pivotally connected to the tip of the connecting rod.

The piston 7 slides up and down within a cylinder liner 5 fitted into the cylinder block 1.

The intake and exhaust valves 23 in the cylinder head are moved up and down by a bushing rod 9 via a valve arm bridge and a valve arm 10.

The bushing rod 9 is pushed upward by the cam 8 via the tappet 22.

The present invention relates to a cam chamber 1a in which the cam 8 is bearing-supported on a cam shaft 20 to which the cam 8 is fixed.

15 is a central air supply pipe, 16 is a fuel injection valve, 19 is a lubricating oil filter, 17 is an oil cooler, 14 is an exhaust manifold, 13 is a supercharger, and 18 is a fresh water cooler.

A lubricating oil passage is provided from the valve arm axis of the valve arm 10 to the upper end of the bushing rod 9, which lubricates the connection point and enters the inside of the tappet 22 through a pipe inside the bushing rod 9, and enters the bottom hole of the tappet 22. 22a leads to the joint between the tappet and the cam 8.

FIG. 2 is a side sectional view of the cam chamber 1a.

FIG. 3 is a front sectional view of the cam chamber 1a.

The camshaft 20 is driven by a camshaft gear 21 provided at one end of the camshaft 20, is supported by a bearing part of the cylinder block 1, and the bearing metal is lubricated by an oil passage 1f opened in the cylinder block of the bearing part. Ru.

The lubricating oil from the oil passage 1f and the lower hole 22 of the tappet 22
Lubricating oil from a accumulates in the cam chamber 1a.

Conventionally, the cam chamber was configured in one chamber covering all cylinders, but this problem arises because the lubricating oil in the cam chamber becomes unevenly distributed in one direction whenever a diesel engine is mounted at an angle or when the ship pitches or rolls. The idea is to separate the intake and exhaust tappets and cams of each cylinder into small chambers to lubricate them.

Furthermore, a lubricating oil return oil passage is opened for each cam chamber 1a of each small chamber at a constant level H from the cam chamber bottom surface 11.

The lubricating oil level H1 is the lowest level of the cam chamber, and even if the cams 8, 8 are tilted to the level h□, the lubricating oil return oil passage 1h is located at the protruding portion 1b of the cam chamber so that the cams 8, 8 are still infiltrated with the lubricating oil surface. It is installed through the.

However, if too much lubricating oil flows into the cam chamber and blows out from the tappet guide, it will cause loss of lubricating oil, so make sure to connect the lubricant return oil path 1g to the cam chamber so that the lubricant level does not reach level 2 or higher. It penetrates through the protrusion 1c of 1a.

h2 indicates the level at which the crane reaches its maximum inclination due to pitching or rolling of the ship.

First of all, as a minimum line, collect lubricating oil to the level of Hl,
If a larger amount of lubricating oil returns and it cannot be handled by the oil passage 1h, the level H2 of the return oil passage 1g
The return oil passage 1g has the role of returning the oil to the crank chamber using the return oil passage 1g.

As described above, in the present invention, a cam shaft equipped with an intake/exhaust valve operating cam, etc. is installed through a cam chamber divided for each cylinder, and a lubricating oil return oil passage leading to the crank chamber of the cylinder block is provided in the cam chamber. Since each cam chamber is opened at two locations with different heights, the following effects are achieved.

First, the lubricating oil flowing into the cam chamber can always be maintained at the lowest level H1 to lubricate the cam, tappet, and camshaft bearing.

Secondly, since the height of each cam chamber was changed and the return oil passage 1g1h was opened at two locations, lubricating oil overflowed more than necessary.
If lubricating oil tries to blow out from the tappet guide, it can be returned to the crank chamber through the return oil path 1g, and there is no possibility that too much lubricating oil will overflow.

Therefore, a stable oil level can be maintained even when the engine is operating at an angle.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of the entire diesel engine, FIG. 2 is a side sectional view of the cam chamber, and FIG. 3 is a front sectional view of the cam chamber. 1... Cylinder block, butt... Intake and exhaust valve operating cam, 9... Butsch rod, 20...
...Cam shaft, 1a...Cam chamber, 1d...
... Crank chamber, 1h, Ig ... Lubricating oil return oil path, 11 ... Bottom of cam chamber.

Claims (1)

[Scope of utility model registration request] A camshaft equipped with an intake/exhaust valve actuating cam, etc. is installed through a cam chamber separated for each cylinder, and a lubricant return oil passage leading to the crank chamber of the cylinder block is installed in each cam chamber at a high height. A cam chamber oil sump structure for an internal combustion engine that is characterized by openings in two locations with different sizes.