JPS6023443Y2 - Internal combustion engine oil pump mounting device - Google Patents

Description

[Detailed description of the invention] This invention is particularly applicable to oil pumps for automobile internal combustion engines.
The present invention relates to an improvement of the mounting device.

Oil pumps that are driven by the rotation of the crankshaft and are generally used to supply lubricating oil for internal combustion engines have cylinder blocks with deep skirts, which means that the skirt section is It was usually applied only to models that extended below the crankshaft.

This is because even when an oil pump is attached, the entire circumference of the lower surface of the skirt portion of the cylinder block is formed into one flat surface, so that a seal can be easily formed between the lower surface of the skirt and the oil pan connected thereto.

However, with such a deep skirt type,
For example, as seen in the Utility Model Publication No. 55-1532,
As the overall height of the cylinder block increases, its weight increases accordingly, which ultimately causes a deterioration in the fuel efficiency of the automobile.

This invention was proposed in view of this point, and by forming a boss portion of a predetermined shape on the oil pump body and configuring the oil pan to be connected via this boss portion,
An object of the present invention is to provide an oil pump mounting device for an internal combustion engine that enables a crankshaft-driven oil pump to be mounted on a half-skirt type cylinder block without increasing the overall height of the engine.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in FIGS. 1 and 2, one end of a crankshaft 3 is pivotally supported on the lower surface of a front wall portion IA of a half-skirt type cylinder block 1 via a bearing cap 2. As shown in FIGS.

An oil pump main body 5, which is rotationally driven in synchronization with the crankshaft 3 by a gear member 4 fitted to the outward protrusion 3A of the crankshaft 3, is attached to the outside of the front wall IA through a gasket 6 by bolts or the like. It is fixed.

The oil pump main body 5 has a pump chamber 8 equipped with a suction lower A and a discharge 7B outside the gear member 4.
By the rotation of the cylinder block 1, lubricating oil from an oil pan 9, which will be described later, is sucked in from a suction lower A, and is forced to be fed to a main gallery formed inside the cylinder block 1 via a discharge lower B.

Further, an annular boss portion 10 as a mounting seat for the oil pan 9 is integrally formed to protrude from the front surface of the oil pump body 5 so as to surround the lower half of the projecting end 3A of the crankshaft 3.

This annular boss portion 10 further integrally has flat portions 11A and IIB extending in the left-right direction in FIG. They are set to have the same height.

On the lower surfaces of these annular boss portions 10, flat portions 11A, and IIB, there are grooves 1 for gasket retention in the left-right direction in FIG.
2 is perforated.

On the other hand, the front flange portion 9A of the oil pan 9 is also formed in the same shape as the oil pump mounting seat 10, IIA, and IIB.

Therefore, after the oil pump main body 5 is attached to the cylinder block 1, the above-mentioned mounting seats 10, IIA, IIB of the cylinder block 1 lower surface and the oil pump main body 5 are provided with endless convex cross-sections formed along these lower surfaces. When the oil pan 9 is joined via the gasket 13, the joint surface between the lower surface of the cylinder block 1 and the oil pan 9 is sealed all around.

Incidentally, the tightening at this time is performed using bolts or the like between the lower surface of the cylinder block 1 and the flange portion of the oil pan 9.

In other words, the mounting seat 10 and IIA of the oil pump main body 5,
IIB and the front flange portion 9A of the oil pan 9 are simply crimped together.

A dust cover 14 is fixed to the front wall portion 1A of the cylinder block 1 with bolts or the like to cover the exposed portion of the oil pump body 5.

This dust cover 14 has a box shape as a whole as shown in FIGS. 3A and 3B, and its lower surface 14A escapes the protruding end 3A of the crankshaft 3, and the annular boss portion 1 described above.
It is cut out in a semicircular shape so that it partially overlaps with 0.

In the figure, 15 is an annular oil seal fitted on the inner peripheral surface of the oil pump body 5, and 16 is an oil strainer connected to the suction lower of the oil pump body 5.

In this way, a mounting seat such as an annular boss portion 10 is provided protruding from the crankshaft-driven oil pump body 5 attached to the front wall IA of the cylinder block 1, and the oil pan 9 is joined via this mounting seat. (However, only the front flange portion 9A of the oil pan 9) is configured as shown in FIG. Also, the oil pump can be installed without increasing the overall length of the engine.

Furthermore, since the oil pan 9 is installed over the entire lower surface of the oil pump main body 5, a large capacity oil pan 9 can be installed in a small engine.

Further, since the gasket 13 can be of an endless shape over the entire circumference, there is no need for an increase in the number of parts or a deterioration in assembly workability.

Further, the mounting seats such as the annular boss portion 10 described above can also be used as a seating surface for the dust cover 14, and since the cover 14 and the protruding end portion 3A of the crankshaft 3 can be separated, the cover 14 can be easily attached and detached. be.

As explained above, according to this invention, a mounting seat of a predetermined shape to which the flange of the oil pan joins is integrally formed with the crank-driven oil pump, so that the crank-driven oil pan can be used in half. It can be installed on a skirt-type cylinder block without increasing the overall height of the engine, reducing engine weight and improving fuel efficiency.

In addition, the lower surface of the boss at the front of the oil pan and the front flange of the oil pan have a predetermined shape so that they are joined to each other, so that a sufficient seal can be achieved through the gasket, and the entire lower surface of the skirt section is evenly spaced. Even if it is not composed of two flat surfaces, there is no need to worry about oil leakage.

[Brief explanation of the drawing]

Figure 1 is a front view of this invention, Figure 2 is a vertical side view of it,
Figures 3 A and B are side and front views of the dust cover, Figure 4
The figure is an overall exploded perspective view. 3...Crankshaft, 1...Cylinder block fallen, IA...Cylinder block front wall, 5...Oil pump body, 3A...Crank Projecting end portion of shaft, 10... Annular boss portion, IIA, IIB... Plane portion, 9...
Oil pan, 9A...Front flange, 13.
·····gasket.

Claims (1)

[Scope of utility model registration request] An oil pump body that is linked to the crankshaft is attached to the front surface of a half-skirt type cylinder block that pivotally supports one end of the crankshaft, and an oil pump body that surrounds approximately the lower half of the protruding end of the crankshaft is attached to the front of the oil pump body. A boss portion having a predetermined shape is provided protrudingly, and the flange portion of the oil pan is placed in a corresponding shape on the lower surface of the boss.
An oil pump mounting device for an internal combustion engine, characterized in that an oil pan is mounted on the lower surface of a cylinder block via a gasket.