JPS606582Y2 - Engine gear train lubrication system - Google Patents

Description

[Detailed description of the invention] This invention relates to a lubricating device for an engine, and in particular to a lubricating device for a gear engaging portion located on a lubricating oil surface in a gear case, by increasing the temperature of the lubricating oil in this gear engaging portion. The purpose is to provide sufficient lubrication without causing any lubrication.

Conventionally, the lubricating oil level in the gear case is raised to lubricate the gear engaging part on the oil level, and the gear engaging part on the lubricating oil level is
Some gears are lubricated by lubricating oil that is scattered by the gears immersed in the lubricating oil, and other lubricating oil that is carried along by adhering to the gears.

However, when the lubricating oil level is raised in this way, the lubricating oil easily reaches the gear engagement part above the oil level, but the amount of lubricating oil that is scattered increases, and this cools and heats various parts in the gear case, causing lubrication. As the oil returns to the oil chamber, the oil temperature increases immediately, reducing the lubricating effect. To prevent the oil temperature from rising, lower the lubricating oil level.
It becomes difficult for the lubricating oil to reach the gear engagement part above the oil surface, resulting in insufficient lubrication.

This becomes a big problem when the gear engagement portion is in an output relationship where a large force is applied.

This idea solves the conflicting problems mentioned above. To achieve this, the lubricating oil level is lowered, the part of the gear case that faces the gear is brought closer to the circumferential surface of the gear, and an oil path is formed in the gap between the gears. The rotation of the lubricating oil passage allows the lubricating oil to move quite far and high above the oil surface, making it possible to sufficiently lubricate the gear engagement portion on the lubricating oil surface.

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a cutaway side view of essential parts of a vertical diesel engine, and FIG. 2 is a longitudinal sectional front view.

In this engine E, a gear case 2 is fixed to the front side of a crankcase 1, and an oil pan 3 is fixed to the lower side.The front side of the gear case 2 is covered with a gear case cover 4, and the lower part of the crank chamber 5 and the bottom inside the gear case 2 are respectively fixed. Lubricating oil chambers 6 and 7 are formed.

The lubricating oil in the lubricating oil chamber 6 at the bottom of the crank chamber 5 is sucked into the lubricating pump 9 through the strainer 8, and
The lubricating oil is pumped through a pressure feed path 11 to various lubricating locations such as the valve drive shaft and the valve drive camshaft.

The outlet 12 of the pressure regulating valve for keeping this pressure constant is opened in the gear case 2, and filtered lubricating oil is constantly supplied to the lubricating oil chamber 7 in the gear case 2, and the specified oil level is the same at both temperatures. It is kept constant by the communication hole 13 that communicates the oil chambers 7 and 6.

Inside the gear case 2, with the crank gear 14 at the center,
A fuel cam gear 15 and a valve train cam gear 16 are located above it on the left and right.
However, an output gear 17 is arranged on the right side, and a lubrication pump drive gear 18 is arranged on the lower side.

In this way, the lubrication pump drive gear 18 can be driven directly by the crank gear 14, the fuel cam gear 15 and the valve train cam gear 16 can be driven by the idle gear 19, and the output gear 17 can be driven by the crank gear 14 through the output transmission gear 20. Linked together.

The crank gear 14 rotates clockwise, the lubrication pump drive gear 18 and the output transmission gear 20 rotate counterclockwise, and the output gear 17 rotates clockwise.

Now, of the peripheral wall 2a of the gear case 2, the output transmission gear 2
The portion facing each lower circumferential portion of the output gear 17 is formed as a lubricating oil supply guide surface 21 so as to be close to each lower circumferential portion and face each other, and this guide surface 21 and the lower circumferential portion of each gear 20, 17 An oil passage 22 is formed between the two.

The inlet 22a of the oil passage 22 is opened above the specified oil level and facing slightly downstream of the peripheral surface portion of the lubricant pump drive gear 18 facing the output transmission gear 20 in the rotational direction.

The lower half of the lubricant pump drive gear 18 located at the lowest position is below the specified oil level, so when this gear 18 rotates, the lubricant oil is moved diagonally upward, that is, to the output transmission gear 20, by centrifugal force. It enters the oil passage 22 from the inlet 22a, and is conveyed within the oil passage 22 toward the output gear 17 by the output transmission gear 20 like a gear pump.

A portion of the lubricating oil is then blown away from the output transmission gear 20 toward the output gear 17 by centrifugal force.

That is, when the engine E is started, the lubricating oil in the lubricating oil chamber 7 at the bottom of the gear case 2 is carried by the rotation of each gear 18 and 20 to the output gear 17 located at a high position in the gear case 2, and is transferred to the output transmission gear. 20 and the output gear 17, the engagement portion 23 between the output gear 17 and the output transmission gear 20, and further the crank gear 14 and the output transmission gear 2.
The occlusal part 23 with 0 is well lubricated.

Of course, while the lubricating oil is being conveyed from the lubricating oil chamber 7 to the output gear 17, a considerable amount of lubricating oil leaks to the end face of the gear, but each gear 18 and 20 is rotating at a considerable speed, A sufficient amount to lubricate the occlusal portion 23 is ensured.

In order to ensure a sufficient amount of lubricating oil, the lubricating oil supply guide surface 21 should be located directly near the lower peripheral portions of the output transmission gear 20 and the output gear 17, and the lubricating oil supply guide surface 2
1 is made as an independent part using a plate material 24 and fixed in the gear case 2 along the lower circumference of each gear 20 and 17 (see FIGS. 3 and 4), and the plate material 24 is made into a U-shaped cross section. It is conceivable to cover the teeth of each gear 20, 17.

Since this invention is structured and operates as described above, it produces the following effects.

(a) An oil passage formed between the lower periphery of the output gear and output transmission gear and the lubricating oil guide surface of the gear case, where the output gear and output transmission are on a specified oil level due to the rotation of each gear. Since the lubricating oil can be lifted up to the occlusal part with the gear, it is possible to forcibly lubricate the occlusal part, which is located far away and higher than the specified lubricating oil level.

In addition, compared to the above-mentioned high specified oil level, the amount of lubricating oil splashed into the gear case by the gear is prevented from becoming excessive, and the lubricating oil temperature is high and does not become hot, which reduces the lubrication effect. Good lubrication is possible without any problems.

(b) The structure for moving the lubricating oil to the gear engagement part above the specified oil level is a simple structure that consists of forming a lubricating oil guide surface close to the lower periphery of each of the output gear and the output transmission gear. Since no special piping is required, it can be implemented easily and inexpensively.

(c) If the lubricating oil guide surface is made of plate material and made separately from the gear case, it can be applied not only to new engines but also to existing engines.

(2) Since the power source for guiding the lubricating oil from the lubricating oil chamber to the lubrication site, the engagement part of the gear, is the rotation of the gear, lubrication begins immediately when the engine is started.

Therefore, unlike when lubricating oil is pumped, there is no delay in operation, and there is no possibility of insufficient lubrication due to oil leakage from the pumping path.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a cutaway side view of essential parts of a vertical diesel engine, FIG. 2 is a vertical front view, FIG. 3 is a view equivalent to FIG. 2 showing another embodiment, and FIG. FIG. 4 is a sectional view taken along the line IV--IV in FIG. 3. L...Specified oil level, 2...Gear case,
2a... Peripheral wall, 7... Lubricating oil chamber, 14
...... Crank gear, 15... Fuel cam gear, 16... Valve train cam gear, 17...
・Output gear, 18... Lubricating pump drive gear, 1
9... Idle gear, 20... Output transmission gear, 21... Lubricating oil supply guide surface, 22...
...Oil passage, 22a...Inlet, 23...
...Occlusal part, 24...Plate material.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In the gear case 2, a fuel cam gear 15 and a valve train cam gear 16 are placed above and on the left and right sides of the crank gear 14, an output gear 17 is placed on the lateral sides, and a lubricating pump drive gear 18 is placed below the crank gear 14. The fuel cam gear 15 and valve drive cam gear 16 are interlocked and connected to the crank gear 14 via an idle gear 19, and the output gear 17 is interlocked via an output transmission gear 20. A lubricating oil chamber 7 is provided at the bottom of the gear case 2. The lower half of the lubricant pump drive gear 18 is positioned below the specified oil level in the lubricant oil chamber 7, and for each gear 18, 20.17, the lubricant pump drive gear 18 faces the output transmission gear 20. The peripheral surface portion rotates upward, the lower peripheral portion of the output transmission gear 20 rotates toward the output gear 17, and the lower peripheral portion of the output gear 17 rotates toward the output transmission gear 20. The lubricant supply guide surface 21 is brought close to the lower circumference of the output transmission gear 20 and the output gear 17 so that they face each other, and the lubricant supply guide surface 21 and the output transmission gear 20 and the output gear 17 An oil passage 22 for supplying lubricating oil to the engagement portion 23 of the output transmission gear 20 and the output gear 17 is formed between the output transmission gear 20 and the output gear 17. A gear train lubricating device for an engine, characterized in that the opening is located above the lubrication pump drive gear 18 and faces slightly downstream in the rotation direction of the peripheral surface portion facing the output transmission gear 20 of the lubrication pump drive gear 18. 2 Utility Model Registration Scope In the engine gear train lubrication device described in claim 1, the peripheral wall 2a of the gear case 2 is formed close to the lower peripheral portions of the output transmission gear 20 and the output gear 17, and this approach A lubricating oil supply guide surface 21 is formed on the inner surface of the peripheral wall 2a. 3 Utility Model Registration Scope In the engine gear train lubrication system described in claim 1 or 2, the lubricating oil supply guide surface 21 is connected to the output transmission gear 20 and the output gear 1.
7, placed close to each lower circumferential surface. 4. In the gear train lubrication device for an engine described in claim 1 of the utility model registration claim, the lubricating oil supply guide surface 2
1 is made as an independent part using plate material 24 and fixed inside the gear case 2.