JPS5835893Y2 - Crankshaft oil seal oil supply structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil supply structure for a crankshaft oil seal of an internal combustion engine.

The purpose of this invention is to improve the lubricity and durability of the oil seal material provided in the oil seal section at the end of the crankshaft, as well as to improve the durability of the oil seal retainer that holds the oil seal material. The aim was to create common parts that could be applied to both vertical and horizontal engines.

As shown in FIG. 1, the conventional crankshaft oil seal section has a crankshaft 1 supported by a main bearing 5 on a cylinder block 4, and a flywheel 2 attached to the crankshaft end 1a.

Further, an oil sealing material 6 is brought into contact with a sleeve 7 fitted on the outer circumferential surface of the crankshaft end 1a to seal oil seeping out from the main bearing 5 portion.

This oil seal material 6 is held in an oil seal retainer 3 fixed to the cylinder block 4, and the oil seal retainer 3 has an annular overflow oil receiver 9 having an oil sump groove 8 on the main bearing 5 side. is installed protrudingly.

This overflow oil receiver 9 is connected to the main bearing 5
In order to prevent the entire amount of oil seeping out from directly colliding with the seal part, it acts as a so-called weir, and was designed to prevent overflow oil from reaching the seal part as much as possible.

As a result, the oil seal portion lacks lubrication, causing the lip of the oil seal material 6 to wear out, which may shorten the service life of the oil seal material and cause oil leakage.

Therefore, if all of the overflow oil reaches the casseal part, it will promote lubrication of the oil seal material and prevent wear, but there is a limit to the oil seal function, and too much overflow oil will prevent oil leakage. Ideally, an appropriate amount of oil should be supplied to the oil seal material.

The present invention solves the above-mentioned conventional problems, provides an ideal oil supply, and has an oil seal oil supply structure that can be applied to different vertical and horizontal engines as a single part.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

Reference numeral 3 designates an oil seal retainer from which an overflow oil receiver 9 having an oil reservoir groove 8 is protruded, as shown in FIG.

The present invention is characterized in that openings ayb are provided at two locations, one above and one side of the annular overflow oil receiver 9, which are cut out at arbitrary angles.

It is desirable that the upper opening a and the one-sided frontage be in a substantially perpendicular relationship.

Therefore, a portion 9a of the overflow oil receiver exists between both openings a+b.

As described above, the present invention has two notches in the upper opening a and the left opening of the overflow oil receiver 9 which is protruded from the oil seal retainer 3, so that the oil seeps out from the main bearing 5. The overflow oil is dammed by the overflow oil receiver 9.9a,
Some of the overflow oil flows through the two openings ayb.
As a result, the sliding surface between the oil seal material 6 and the sleeve 7 is supplied with oil.

Since this amount of oil is supplied through two openings, the upper opening a and the left opening S, the most appropriate amount for lubricating the oil seal material 6 can be obtained, and it cannot be obtained by opening only one of them. Furthermore, it is not possible to standardize parts for different types of engines with one part, which will be described later.

Incidentally, a comparison of the amount of oil supplied per engine speed between the conventional oil seal retainer and the present invention shows that, as is clear from the graph in Fig. However, in the present invention, as shown in curve A, the data from the measurement results shows that an appropriate amount of oil was obtained for lubrication of the oil seal material 6. Proven.

Next, since the openings at and b are opened in two directions at right angles, one part can be commonly used for both vertical and horizontal engines.

In other words, in the case of a vertical engine, the upper opening a and the left opening A are arranged in a relationship as shown in Fig. 2, but in the case of a horizontal engine, the left opening A is located upward, and the upper opening a is located on one side and obtains the appropriate amount of lubrication action.

Moreover, the over 70-
The oil receiver parts 9 and 9a are attached to the crankshaft end 1 when installing the oil seal retainer to the cylinder block.
The oil seal can be protected by acting as a guide member for the oil seal, and a smooth fitting operation can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional crankshaft oil seal, Fig. 2 is a front view of the oil seal retainer according to the present invention, and Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2. FIG. 4 is a comparison curve diagram of engine rotation speed vs. oil supply amount between the conventional engine and the present invention. 1...Crankshaft, 3...Oil seal retainer, 6...Oil seal material, 9
, 9a... Overflow oil receiver, a...
...Upper opening, b...Left side opening.

Claims (1)

[Scope of utility model registration request] At the crankshaft oil seal portion where an oil seal material held in an oil seal retainer is brought into contact with the outer circumferential surface of the end of the crankshaft which is supported by a main bearing on the cylinder block, the oil seal member is provided protruding from the oil seal retainer toward the main bearing side. Cutout openings are provided at two locations, one above the annular overflow oil receiver and one on one side in a direction substantially perpendicular thereto, and one of the cutout openings is provided in both the vertical and horizontal directions of the cylinder block. A crankshaft oil seal oil supply structure located above.