JPH04365913A - Lubricator for vertical shaft type engine - Google Patents

Abstract

PURPOSE:To provide a lubricator for a vertical shaft type engine capable of effectively introducing oil sucked up through an oil pipe to a main lubricating unit for the purpose of lubrication. CONSTITUTION:In a lubricator for a vertical shaft type engine where a cylinder is disposed horizontally and a crankshaft 3 and a camshaft 6 in association with the crankshaft 3 are pivoted vertically inside a crank case 1, an oil pipe 17 is vertically inserted through and fixed to a driven gear 7 on the camshaft 6. The oil pipe 17 is positioned in such a manner as to face the lower surface of a counter weight 15 and to face at the upper edge thereof a breather passage port 11 when the counter weight 15 of the crankshaft 3 is located above the camshaft driven gear 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a lubricating device for a vertical shaft engine.

0002

2. Description of the Related Art As shown in cross section in FIG. 5, the shaft end of an output shaft 2 is led out from the bottom surface of a crankcase 1, and in a vertical shaft type engine used for a lawn mower, etc. In order to supply lubricating oil to the large end 5a of the engine 5, a lubrication mechanism different from that of a general horizontal shaft type engine is adopted.

As shown in FIG. 5, an oil pipe 8 is vertically inserted into the camshaft driven gear 7 on the valve camshaft 6 so that its lower end is immersed in oil O. Due to the rotation, the oil pipes 8 rotate together, and the oil O is sucked up due to the pressure difference between the lower end of the oil pipe 8 and the upper end open to the atmosphere, and the oil is sprayed to the main lubrication points (Utility Application No. 1-25155).
issue). In the figure, 9 is a cylinder, 10 is a piston, 11 is a breather passage opening, and 12 and 13 are cams.

0004

[Problems to be Solved by the Invention] However, with the above configuration, oil splashed up by the rotation of the engine splashes onto the breather passage opening 11 opened inside the crankcase 1 and directly enters the breather passage opening 11. There is a problem in that oil is discharged outside the engine, increasing oil consumption. In addition, the oil tends to scatter upwardly inside the crankcase 1 through the oil pipe 8, and is difficult to scatter horizontally, so that the amount of oil splashed to the main lubricating parts is reduced, resulting in insufficient lubrication.

This invention is an improvement on the above-mentioned suction type lubrication device using an oil pipe, and is suitable for a vertical shaft type engine that can effectively guide the oil that is sucked up and scattered through the oil pipe to the main lubricating part. The purpose is to provide a lubricating device.

[0006]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the lubricating device for a vertical shaft engine according to the present invention has a cylinder arranged horizontally and a crankshaft and a camshaft arranged vertically in a crankcase. In a lubricating system for a shaft-supported vertical shaft engine, an oil pipe is inserted into the driven gear on the camshaft so as to pass through it vertically, and the counterweight of the crankshaft aligns the insertion position of the oil pipe with the camshaft. When located on the driven gear, the oil pipe faces the lower surface of the counterweight, and the upper end of the oil pipe faces the breather passage opening.

[0007]

[Operation] When the crankshaft rotates due to engine rotation, the camshaft rotates in the opposite direction, and oil is sucked up through the oil pipe due to the rotation of the camshaft, and the oil is scattered into the crankcase. When this oil scattering from the oil pipe approaches the breather passage opening, the counterweight of the crankshaft approaches the oil pipe from the opposite side, and when the oil pipe reaches the position facing the breather passage opening, the counterweight covers the oil pipe. , oil is prevented from getting into the breather passage opening. The oil sprinkled on the counterweight is directed horizontally, effectively lubricating the cylinder and gear contact areas. When the counterweight leaves the upper end of the oil pipe, the oil does not flow toward the breather passageway opening, but instead lubricates other locations that require lubrication.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section of the main part of the present invention, in which a drive gear 14 is fixed to a crankshaft 3 that is vertically supported in a crankcase 1, and a crankshaft is mounted parallel to the crankshaft 3. A driven gear 7 fixed to a camshaft 6 that is pivotally supported by the case 1 is meshed with the drive gear 14.

Drive gear 1 of the crankshaft 3
A crank-shaped counterweight 15 is located above 4.
16 are provided.

An oil pipe 17 is inserted vertically through the driven gear 7 of the camshaft 6 so as to be inclined backward by an angle θ with respect to the rotational direction a, as shown in FIGS. 2 and 3. An opening 18 at the lower end of this oil pipe 17 is formed obliquely to the axis of the oil pipe 17, and this opening 18 is relatively perpendicular. This opening 18 is immersed in oil O in the crankcase 1, and the rotation of the driven gear 7 in the direction of arrow a allows the oil O to easily enter the opening 18. In addition, in order to improve the intake of oil O, the direction of rotation a of the driven gear 7 is
On the other hand, a slit 19 is formed in the axial direction on the front side.

The insertion position of the oil pipe 17 is such that when the counterweight 15 of the crankshaft 3 is located above the driven gear 7 (the state shown in FIG. 1), the upper end of the oil pipe 17 faces the lower surface of the counterweight 15. At this time, the upper end of the oil pipe 17 is facing the breather passage opening.

Therefore, when the crankshaft 3 rotates due to the rotation of the engine, the camshaft 6 shifts to the gear 14.
, 7 rotate in the opposite direction to the crankshaft 3, and this rotation sucks up the oil O through the oil pipe 17 and scatters the oil into the crankcase 1. When the direction of oil scattering by the oil pipe 17 approaches the breather passage opening, the counterweight 15 approaches the upper end of the oil pipe 17 from the opposite side, and when the oil pipe 17 comes to the position facing the breather passage opening, the oil pipe 1
The counterweight 15 comes to cover the upper end of the breather passageway 7, thereby preventing oil from splashing onto the breather passage opening. The oil sprinkled on the counterweight 15 heads horizontally and is sprinkled on the cylinder portion and the gear contact portion to lubricate them. When the counterweight 15 leaves the upper end position of the oil pipe 17, the oil has moved to a position where it does not go to the breather passage, but is scattered toward other parts that require lubrication and lubricates them.

In order to improve oil scattering when the counterweight 15 covers the upper end of the oil pipe 17,
As shown in Fig. 4, there is a slope 2 at the outer end of the lower surface of the counterweight 15.
It is preferable to form 0.

[0015]

Effects of the Invention As described above, according to the present invention, oil consumption can be greatly reduced because oil does not scatter to the breather passage opening, which causes oil discharge, and a wire mesh is installed at the breather passage opening to prevent oil from leaking. This eliminates the need for additional mechanisms such as, and simplifies the structure. Furthermore, the oil is effectively splashed onto the cylinder and gear parts, increasing the lubrication effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of the camshaft, driven gear, and oil pipe in FIG. 1;

FIG. 3 is a front view of FIG. 2.

FIG. 4 is a side view of another modification.

FIG. 5 is a sectional view showing a conventional technique.

[Explanation of symbols]

1 Crank case 3 Crankshaft 6 Camshaft 7 Driven gear 11 Breather passage entrance 14 Drive gear 15, 16 Counterweight 17 Oil pipe 18 Opening 19 Slit 20 Slope

Claims (1)

[Claims] 1. A lubricating device for a vertical shaft type engine in which a cylinder is arranged horizontally and a crankshaft and a camshaft are vertically supported in a crankcase, in which an oil pipe passes vertically to a driven gear on the camshaft. Insert the oil pipe so that the oil pipe is inserted in the correct position.
A vertical shaft type engine characterized in that when the counterweight of the crankshaft is located on the camshaft driven gear, the counterweight is in a position facing the lower surface of the counterweight, and the upper end of the oil pipe is in a position facing the breather passage opening. Lubrication device.