JPS606583Y2 - Engine power take-off shaft lubrication system - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that lubricates the power take-off shaft of an engine.
The aim is to use existing structures to make it possible to do it cheaply and reliably.

Forced lubrication is required for parts such as the power take-off shaft that are subject to large forces. Generally speaking, oil supply piping or passages are attached to the engine, lubricating oil is pressurized into the pipes, and the lubricating oil is forced into the piping to reach the power take-off shaft. I'm trying to guide you.

Therefore, the structure becomes complicated, manufacturing costs increase, and the balance of oil supply with other lubrication locations must be considered.

Furthermore, there is a risk that the lubricating oil may leak from the pipe before reaching the power take-off shaft, and in order to ensure forced lubrication, high precision is required of the components, which further increases costs.

Therefore, the inventor of this invention focused on the fact that when the engine is running, a mist of oil is always present around the power take-off gear that transmits power to the power take-off shaft, and uses this mist oil to forcibly lubricate the power take-off shaft. I thought about doing it.

That is, in order to solve the above problems using mist oil, this invention forms a passage that communicates from the inside of the power take-off gear to the outside, and connects the starting end of this passage to the bearing of the power take-off shaft. The mist oil is communicated with the oil mist space around the gear through the passageway, and as the power take-off shaft rotates, mist oil is passed through this passage to forcibly lubricate the bearing of the power take-off shaft.

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.

The engine body 1 of this engine E consists of a crankcase 2, a cylinder block 3 fixed to the upper side of the crankcase 2, and a gear case 4 fixed to the front side.An oil pan 5 is fixed to the lower side of the crankcase 2, and the gear case 4 The front surface of is covered with a gear case cover 4a.

Lubricating oil chambers 6 and 7 are formed in the lower part of the crank chamber R and the bottom of the gear case 4, respectively.

The lubricating oil in the lubricating oil chamber 6 in the lower part of the crank chamber R is sucked into the lubricating pump 9 through the strainer 8, and is pumped into the crankshaft 1.
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 4, and filtered lubricating oil is constantly supplied to the lubricating oil chamber 7 in the gear case 4. It is kept constant by the communication hole 13 that communicates the oil chambers 7 and 6.

Inside the gear case 4, with the crank gear 14 at the center,
A lubricating oil pump drive gear 15, an output transmission gear 16, and the like are arranged, as well as a power extraction gear 17 rotated by the output transmission gear 16 at a position considerably away from the specified oil level.

Each of these gears 15, 16, 17 is a crank gear 14 that rotates clockwise, the lubricant pump drive gear 15 and output transmission gear 16 rotate counterclockwise, and the power extraction gear 17 rotates clockwise. Rotated.

Then, the lower half of the lubricant pump drive gear 15 located at the lowest position is below the specified oil level, and the rotation of this gear 15 scatters the lubricant oil upward, and the output transmission gear 16 Gap 18 between the peripheral surface and the outer wall 4b of the gear case 4
is carried toward the power take-off gear 17, and the lubricating oil is also splashed by the power take-off gear 16, and the gear case 4
The interior is an oil mist space S.

This mist oil lubricates the power take-off shaft 19.

That is, as shown in FIG. 3, the outer wall 4 of the gear case 4
A power take-off boss 20 is attached and fixed to b, and the power take-off shaft 19 is mounted on this boss 20 with two bearings 21.2.
2, and the power take-off gear 17 is formed integrally with the inner end 19a of the power take-off shaft 19.

A discharge hole 23 is formed in the power take-off shaft 19 and passes through it in the axial direction, and an input shaft 24a of a working hydraulic pump 24 is spline-fitted into this hole 23.

A part of the outer wall 4b forms a gap 25 near the end face of the power take-off gear 17, and this gap 25 serves as a centrifugal discharge path 26, the starting end 26a of which is connected to both bearings 21 and 25. It communicates with the oil mist space S via the rolling space 27 of 22.

Therefore, when the power take-off shaft 19 rotates, the mist oil in the gap 25 is discharged to the outside by centrifugal force, and negative pressure is generated in the center O of the power take-off gear 17.

This negative pressure causes the mist oil in the oil mist space S to be sucked through the rolling spaces 27 of the bearings 21 and 22, causing the mist oil to flow as shown in FIG. 4.

The mist oil passing through the transfer space 27 then forcibly lubricates the bearings 21 and 22.

That is, the power take-off shaft 19 is lubricated.

The above-mentioned suction force becomes stronger because the narrower the gap 25 is, the greater the centrifugal force becomes.
The closer b is brought together, the more the mist oil will flow, and the more effectively the power take-off shaft will be lubricated.

In the above embodiment, the power output shaft 19 and the input shaft 24a of the working pump 24 are spline-fitted, and the starting end 26a of the centrifugal discharge path 26 is connected to the oil through the rolling space 27 of the bearings 21 and 22. Although it is made to communicate with the mist space S, it is also possible to make a small hole in the outer end 19b of the power extraction shaft 19 in a direction perpendicular to the shaft center to make the starting end 26a of the centrifugal discharge path 26 communicate with the oil mist space S. good.

This is a case where the power take-off shaft 19 protrudes to the outside, and in this case, the discharge hole 23 does not pass through the power take-off shaft 19 and has a bottom.

Furthermore, in order to make the mist oil flow well in the centrifugal discharge passage 26, the inside of the discharge hole 23 and the power extraction gear 17 are
It is conceivable to attach a wind blower to the end face of the

In short, it is sufficient if the mist oil passes through the transfer spaces of the bearings 21 and 22.

Since this invention is constructed and operates as described above, it has the following effects.

(a) The mist oil that exists around the power take-off gear passes through the transfer space of the bearing that supports the power take-off shaft, so the mist oil that passes through this space forcibly lubricates the power take-off shaft. can do.

(b) The structure for forcibly lubricating the power take-off shaft with mist oil can be implemented using existing structures, so there is no need to provide special oil supply piping, and it can be implemented at low cost.

(c) Since lubrication is performed by the rotation of the power take-off shaft itself, lubrication of the power take-off shaft begins immediately after the engine is started, and continues to be lubricated while the engine is running.

Therefore, the power take-off shaft can be reliably lubricated.

That is, compared to the case where lubricating oil is pumped, there is no lubrication delay and no malfunction due to oil leakage occurs.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and Fig. 1 is a cutaway side view of the main parts of a vertical diesel engine, Fig. 2 is a longitudinal front view, Fig. 3 is a cross-sectional plan view, and Fig. 4 is a main part of Fig. 3. This is an enlarged view. S...Oil mist space, 1...Engine body, 4b...Outer wall, 17...Power extraction gear, 19...Power Extraction shaft, 19a・
...Inner end, 2o...Boss for power takeoff, 2
1.22...Curved bearing, 23...Drain hole,
25...Gap, 26...Centrifugal discharge path,
26a... Starting end, 27... Rolling space.

Claims (1)

[Claims for Utility Model Registration] 1. Outer wall 4b of oil mist space S in engine body 1
A power take-off boss 20 is provided in the power take-off boss 20, the power take-off shaft 19 is supported by the power take-off boss 20 via bearings 21, 22, and a power take-off gear 17 is fixed to the inner end 19a of the power take-off shaft 19. A centrifugal discharge passage 26 for discharging oil from the inside of the power extraction gear 17 to the outside is formed in the power extraction gear part, and the starting end 26a of the centrifugal discharge passage 26 is connected to the bearing 21.
．． A power take-off shaft lubrication device for an engine 1, characterized in that it communicates with an oil space S via a transfer space 27 of 22. 2 Utility Model Registration In the engine power take-off shaft lubrication device described in claim 1, the outer wall 4b is brought close to the end face of the power take-off gear 17 to form a gap 25, and this gap 25 is connected to the centrifugal discharge passage 26. What was said.