JPS6214355Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a cylinder block for internal combustion engines.
In particular, it relates to a cylinder block for an internal combustion engine having an oil bath cam chamber.

In this type of internal combustion engine, the intake cam and exhaust cam that operate the intake valve and exhaust valve are lubricated by lubricating oil stored in an oil bath type cam chamber. Therefore, the lubricating oil level must be maintained at a level sufficient to lubricate the exhaust and intake cams in relation to their positions, and this lubricating oil level must be maintained at a level sufficient to lubricate the exhaust and intake cams. It is regulated by the height of the weir that defines the location of the oil sump that forms the rim. When the level of lubricating oil exceeds a specified level, the excess amount flows over the weir that defines the location of the oil sump and flows down into the recess between the cylinders. Therefore, in the conventional cylinder block, the height of the weir for defining the oil sump position in the oil bath type cam chamber is the same before and after the oil bath chamber.

On the other hand, when mounting the engine on a vehicle, due to the relationship between the accelerator position and the engine mounting position,
The propeller shaft is tilted, and the permissible tilt angle of the propeller shaft determines the mounting angle of the engine relative to the vehicle. Therefore, as mentioned above, the level of lubricating oil in the oil bath type cam chamber is determined by the height of the oil sump position regulating weir, but in reality, when the engine is When placed, the cylinder block tilts and
Since the lubricating oil flows over the oil sump location weir, the actual height of the oil sump location weir that holds the lubricating oil is determined by the vehicle mounting angle of the engine. . Therefore, depending on the vehicle mounting angle of the engine, it may not be possible to maintain a sufficient level of lubricating oil to lubricate the intake cam and exhaust cam.
Also, when the engine is tilted relative to the vehicle, the intake cam and exhaust
In order to maintain a sufficient level of lubricating oil to lubricate the cam, it is necessary to increase the height of the weir that defines the oil sump location, which increases the weight of the cylinder block and increases the size of the structure. There were structural and economic disadvantages.

This idea was made in view of the above circumstances, and it is not necessary to increase the height of both the front and rear oil sump regulation weirs in the cylinder block, thus saving material and weight. The object of the present invention is to provide a cylinder block for an internal combustion engine that can reduce the

Corresponding to this purpose, the cylinder block for an internal combustion engine of this invention has a cylinder block with an oil bath type cam chamber, and a cylinder block of the oil sump position regulating weir of the oil bath type cam chamber. When mounted on a vehicle, the height of the lower oil sump position defining weir is greater than the height of the upper oil sump position defining weir.

The details of this invention will be explained below with reference to the drawings showing one embodiment.

In Figures 1 and 2, 1 is a cylinder.
A cylinder block 1 rotatably supports a camshaft 4 via a bearing 3, and a cylinder block 1 rotatably supports an intake cam 5 and an exhaust cam 6 between adjacent journal parts 2 of the camshaft 4. An oil reservoir 7 of lubricating oil is formed below them, and the intake cam 5
The exhaust cam 6 is immersed in lubricating oil held in an oil sump 7. The front and rear ends of the oil sump 7 are divided by weirs A and B, and the amount and level of lubricating oil stored in the oil sump 7 is regulated by the heights of these weirs A and B. . What should be noted here is the position and height of weirs A and B.
When the cylinder block 1 is mounted on a vehicle, the height ha of the lower weir A is larger than the height hb of the upper weir B. In this case, the difference in height between the two weirs A and B △h=
ha-hb is Δh=ltanθ, where l is the longitudinal length of weirs A and B, and θ is the tower mounting angle of the engine.
Furthermore, oil pits 8 and 9 are formed on the outside of the weirs A and B.

When the cylinder block 1 configured in this way is mounted on a vehicle, the lubricating oil level forms a horizontal plane, and the horizontal plane is a plane connecting the top surface of weir A and the top surface of weir B. matches. Therefore,
The total height of weir A and the total height of weir B are each effectively used to retain the lubricating oil at the required level, and there is no need to provide any wasted parts in the height direction, especially in weir B. This reduces the weight of the cylinder block, making it both structurally and economically effective. Excess lubricating oil contained in the oil sump 7 crosses weirs A and B,
The oil will flow down from the oil pits 8 and 9. Also,
In particular, by aligning the top surface of weir A with the horizontal plane,
If it is tilted, excess lubricating oil will surely flow out of the weir A, thereby making it possible to accurately control the amount of lubricating oil and avoid wasting storage of lubricating oil.

[Brief explanation of the drawing]

FIG. 1 is a partially explanatory vertical cross-sectional view of a cylinder block for an internal combustion engine according to an embodiment of the invention, and FIG. 2 is a cross-sectional view taken along the line - in FIG. 1... Cylinder block, 2... Journal, 3... Bearing, 4... Cam shaft,
5...Intake cam, 6...Exhaust cam
Cam, 7...Oil sump, 8...Oil pit, 9...Oil pit.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) When a cylinder block with an oil bath type cam chamber is mounted on a vehicle, the height of the weir for regulating the position of the oil sump located below is A cylinder block for an internal combustion engine, characterized in that the height is greater than the height of a sump regulating weir. (2) The scope of the utility model registration claim, characterized in that the top surface of the oil sump position regulating weir located below is formed into a slope so as to form a horizontal surface when the cylinder block is mounted on a vehicle. Cylinder block for an internal combustion engine according to item 1.