JPS606571Y2 - Engine lubrication hydraulic pump mounting device - Google Patents

Description

[Detailed description of the invention] This invention relates to a transmission device for a lubricating hydraulic pump used for separate lubrication of two-stroke engines or forced lubrication of four-stroke engines. The purpose of this technology is to reduce production costs by sharing the same parts by making it possible to drive the pump in the normal direction using the same transmission parts and the same pump, even in engines that use the same transmission system.

Some engines have crankshafts that rotate to the right and others that rotate to the left, depending on the purpose of use.

In this case, if an attempt is made to drive the same lubricating oil pressure pump with the same transmission part, if the pump rotates forward with the right-handed engine, it will rotate in the reverse direction with the left-handed engine, making it impossible to pump the lubricating oil.

For this reason, conventionally, in the case of the above-mentioned left-handed rotation engine, in order to rotate the pump in the normal direction, a pump with a different rotation direction was used, or a reverse transmission was inserted into the transmission mechanism for the pump. , the manufacturing cost of the engine was high.

In order to eliminate the above-mentioned drawbacks, the present invention uses a worm transmission mechanism as a component for transmitting the pump to the rotating shaft of the engine, and a driven worm gear is connected to the main drive worm.
For example, by using the special properties of the worm mechanism that engaging from above will result in forward rotation transmission, and engaging from below will result in reverse rotation transmission, the worm gear can be engaged with the worm in reverse transmission, and the above-mentioned left-handed rotation engine can be produced. This eliminates the need to use pumps with different rotational directions or to install a reversing transmission.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows a vertical front view of a forced air-cooled vertical two-stroke engine. This engine E has a cylinder 4 cast into the upper part of a crankcase 2 that pivotally supports a crankshaft and that houses a piston 3 so as to be slidable up and down. This is a two-stroke engine with a well-known structure in which a cylinder block 5 is mounted and fixed, and each lubricating section R between the piston 3 and the cylinder 4, between the crankshaft 1 and the crank rod 6, and between the crankshaft 1 and the crankcase 2.
The lubrication method is a so-called separate lubrication method in which lubricating oil is pumped to each lubrication portion R by a pump P.

That is, the rotation take-out device 8 is fixed to the worm 7 fixed to the crankshaft 1 protruding from the rear side wall 2a of the crankcase 2 so that the worm gear 9 engages with the worm 7, and a lubricating oil pressure pump is connected to the output shaft end 9a of the worm gear 9. The main body 11 of the lubricating hydraulic pump P is attached to the case main body 12 of the rotary extractor 8 so that the input shaft 10 of the pump P fits therein.

This rotation take-out device 8 is provided with a worm transmission mechanism W, which fixes a worm 7 to the crankshaft 1 and a worm gear 9 that meshes with the worm 7, as shown in FIGS. 2 and 3. Consisting of

The rotation take-out device 8 has a case main body 12 formed to cover the periphery of the worm transmission mechanism W, and the case main body 12
A worm gear insertion hole 14 is provided at the top and bottom of the worm gear, the bottom of which has a pivot hole 13 for the worm gear 9.

Worm gear insertion hole 1 of the case body 12 thus constructed
After inserting the worm gear 9 from the opening 15 side of the worm gear insertion hole 14 and pivotally supporting the output shaft 9b in the shaft support hole 13, the other end 9a of the output shaft 9b is inserted into the opening 15 of the worm gear insertion hole 14 with a bearing 16. The bearing 16 is supported and fixed in the worm gear insertion hole 14 with a stop ring 17.

After fitting the spline hole 19 of the input shaft 10 of the lubricating hydraulic pump P to the spline portion 18 at the end of the output shaft 9b protruding from the case body 12, the main body 11 of the lubricating hydraulic pump P is attached to the case body. 12 to the pump mounting surface 12a to complete the installation of the lubricating oil pressure feed pump P.

As shown in FIG. 4, the lubricating hydraulic pump P is a gear pump that has two gears 20 arranged side by side inside a pump casing 11, and the spline portion 1B of the output shaft 9b is fitted into the center of the gear 20. A spline hole 19 is provided.

Then, when the crankshaft 1 of the engine E rotates to the left as shown by the imaginary line in FIG. The lubricating oil is sucked in through the lubricating oil supply pipe 22, flows as shown by the arrows in FIG.

When the rotation direction of the engine E is clockwise, the lubricating hydraulic pump P is attached to the pump mounting surface 12b at the bottom of the case body 12 in the same manner as the lubricating hydraulic pump P described above. It will be done.

Then, the crankshaft 1 rotates as shown by arrow B in the imaginary line in Figure 2, and the pinion gear 9 and output shaft 9b rotate clockwise, so the flow of lubricating oil in the lubricating hydraulic pump P is the same as described above. flows.

Note that the reference numeral 24 in the figure is a lid that closes the opening of the lower pinion gear insertion hole 14.

Also, as shown in the imaginary diagram in FIG. 4, the lubricating hydraulic pump P is shifted laterally depending on the rotational direction of the engine E, and the installation engages with the spline portion 18 at the end of the rotating shaft of the pinion gear 9. It is also conceivable that the lubricating oil pressure pump P that rotates in the same direction can be shared by engines E that rotate in different directions by changing the fit of the spline portion 18 from one gear 20 to the other gear 20.

In the case shown in FIG. 5, spline portions 18 are provided at both ends of the output shaft 9b of the pinion gear 9, and the lubricating oil pressure sending pump 9 is inserted into one of the spline portions 18 depending on the rotational direction of the engine E. It is designed to be fixed to the other mounting surface 12b.

In this case, the case body 12 of the rotary take-out device 8
can be formed into a small size.

Since the present invention is structured and operates as described above, even when the engine rotation direction is different, the same transmission parts and the same pump can be used, and production costs can be reduced by using common parts.

Moreover, regardless of the rotational direction of the engine, one type of transmission part and pump can be used in common, so there is no possibility of assembly errors.

Moreover, the structure for achieving the above effects can also be implemented at low cost with a simple structure that allows the occlusion position of the worm gear to be changed with respect to the worm provided on the rotating shaft.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 shows a forced air cooling vertical type 2
Vertical front view of the cycle engine, Figure 2 is the same as Figure 1 ■-■
Line sectional view, Figure 3 is an enlarged view of main parts, Figure 4 is Figure 2 IV-
The sectional view taken along the line IV and FIG. 5 are views corresponding to FIG. 2 showing another embodiment. P... Lubricating hydraulic pump, E... Engine, R... E lubricating parts, W... Worm transmission mechanism, 1... ...Crankshaft, 7...
... Worm, 9... Worm gear, 12.
...Case wall, 14...Installation hole.

Claims (1)

[Claims for Utility Model Registration] 1. A lubrication hydraulic pump P that pumps lubricating oil to each lubricating part R of the engine E is interlocked and connected to the rotating shaft 1 of the engine E via a worm transmission mechanism W. Drill two types of holes 14 for installing the worm gear 9 in the case wall 12 that covers the
When the worm gear 9 is inserted and engaged with the worm 7 provided on the rotating shaft 1 through one of the assembling holes 14, and when it is inserted and engaged through the other assembling hole 14, the pump P is A mounting device for a lubricating hydraulic pump for an engine, characterized in that the directions of rotation of the transmission to the engines are different from each other. 2 Utility Model Registration Scope of Claims In the mounting device for an engine lubricating hydraulic pump described in paragraph 1, the engine E is a separately lubricated two-stroke engine.