JP2002013405A - Lubricating oil guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excessive heating and seizure of a lubricating part which is caused as it becomes hard to flow lubricating oil in a lubricating oil passage far from an oil pump with one single oil pump is provided while a plural number of the lubricating oil passages are provided in parallel at the time of lubricating a crankshaft and other driveshafts of an engine. SOLUTION: A lubricating oil guide device provided with an oil gallery 2 having a plural number of the oil passages 1, 1... and to supply lubricating oil fed by pressure by the oil pump 3 to an inlet 2a part of the oil gallery 2 through an oil filter 4 constitutes its characteristic feature of making a passage sectional area of the oil passage 1 larger as it is separated farther from the inlet 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil guide device. The present invention relates to a device for maintaining a balance of lubricating pressure oil in an oil passage of a hydraulic device or an engine.

[0002]

2. Description of the Related Art In a conventional lubricating oil guide device, for example, in a lubricating oil passage of an engine, oil collected in an oil pan below an engine is suctioned by an oil pump and is then transferred to an oil gallery. Pump. And
Pressure oil is pushed into each of the oil passages that are opened in the oil gallery.However, in the conventional configuration, since the passage cross-sectional areas of the respective oil passages are the same, the oil passages that are farther downstream of the oil gallery become more distant. The lubricating oil became difficult to flow, and the oil path that became distant on the downstream side was liable to cause problems such as overheating and seizure of the lubrication-required parts.

[0003]

SUMMARY OF THE INVENTION The present invention is to solve such a problem of the conventional device, and has taken the following technical means. That is, a plurality of oil paths 1
1. . . The oil gallery 2 is provided with a lubricating oil pumped by an oil pump 3 and supplied to an inlet 2a of the oil gallery 2 through an oil filter 4. The structure of the lubricating oil guide device is characterized in that the cross-sectional area of the passage is increased.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, the present invention is incorporated into an engine 5 for agricultural tractors. The front end of the clutch housing 6 is attached to the rear of the engine 5. A radiator (not shown) is provided in front of the engine 5, and the cooling fan 8 sucks air around the radiator to cool it.

[0005] The structure of the engine 5 is such that an oil pan 1 made of cast iron or an iron plate formed by drawing an iron plate at the lower portion of a cylinder body 9.
The cylinder head 11 and the head cover 12 are mounted above the cylinder body 9. A cap 13 for closing a lubrication port for injecting lubricating oil is mounted on the head cover 12. An intake manifold 42 for intake and an exhaust manifold 43 for exhaust are attached to the cylinder head 11. 14 is an air cleaner and 15 is a muffler.

The crankshaft 1 is located at the lower end of the cylinder body 9.
The connecting rod 6 is connected to a piston 17 provided in the cylinder body 9 by a connecting rod 18 so as to convert the explosive force in the combustion chamber into rotational movement. A camshaft 19 is provided near the side wall at the upper and lower middle portions of the cylinder body 9, and opens and closes the intake and exhaust valves 21 of each combustion chamber.

An oil strainer 20 is disposed near the bottom of the oil pan 10. Also, the crankshaft 16
The lubricating oil sucked from the oil strainer 20 through the suction oil passage 22 is pressurized by the hydraulic pump 3 by the operation of the hydraulic pump 3 driven by using the driving force such as the above. The lubricating oil pressurized by the hydraulic pump 3 reaches the oil filter 4 from the high-pressure oil passage 23.

The oil filter 4 is removably attached to the outer wall surface of the cylinder body 9. The oil filter 4 removes dust in the oil, and cleans the lubricating oil while maintaining a predetermined pressure. And reaches the entrance 2a of the oil gallery 2. The oil gallery 2 has a plurality of oil paths 1, 1. . . Are branched and juxtaposed, and the respective oil paths 1, 1. . Is the metal part of the crankshaft 16 and the camshaft 1
9 and then a part of the high pressure oil is blown out from another small opening to lubricate necessary parts such as the camshaft 41 for the injection pump 40. Although not shown, the remaining pressure oil is sent further around the intake / exhaust valve 21, and after lubricating other parts, returns to the oil pan 10 below the engine 5 according to gravity.

In the illustrated example, the oil passage 1 provided at a position farther from the inlet 2a of the oil gallery 2 has a larger passage sectional area. For example, if the diameter of the oil passage 1 near the inlet 2a is 12 mm, the oil passage 1a at the farthest part is 14 mm.
To facilitate the inflow of lubricating oil.

A relief valve 25 is provided in the middle of the transfer oil passage 24, and when the internal pressure of the transfer oil passage 24 fluctuates rapidly, the relief valve 25 is opened. From the oil pan 10 side. In the illustrated drain oil passage 24, the oil is discharged from the inlet 2a of the oil gallery 2 to the vicinity of the oil passage 1a farthest from the oil gallery 2, and the shortage of the lubricating oil is compensated from the downstream side.

The relief valve 25a shown in FIGS. 5 and 6 of another example is intended to correct the opening / closing pressure of the valve by the internal pressure of the transfer oil passage 24.
The holding position of the relief piston 27 slidably mounted therein is changed by the internal pressure of the transfer oil passage 24. That is, a balance chamber 29 is provided downstream of the relief cylinder 28 that holds the relief valve 25a and is connected to the transport oil path 24 by an oil path via a communication path 31, and a balance piston 30 is provided in the balance chamber 29. The balance piston 30 is integrally provided with a rod 33 for supporting a seat plate 32 provided in the relief cylinder 28.
The seat plate 32 moves by the amount that 0 has moved in the axial direction.

A relief spring 34 is provided between the seat plate 32 and the relief piston 27 to change the gap between the ends of the leak holes 35, 35 opened at appropriate positions of the relief cylinder 28 and the head of the relief piston 27. I have. Also,
Balance piston 30 and bottom wall 3 of relief cylinder 28
Between 6, a balance spring 37 is provided. FIG. 5 shows a state in which the conveying oil passage 24 is at a low pressure, and the driving rotation of the oil pump 3 is low. In this case, the internal pressure of the balance chamber 29 acting on the balance piston 30 is also low, the gap between the relief piston 27 and the leak hole 35 is small, and the amount of lubricating oil that escapes from the drain passage 26a toward the oil pan 10 is small. The internal pressure inside is kept high, and the internal pressure acting on the oil passage 1 of the oil gallery 2 also becomes high. Reference numeral 38 denotes a pressure release hole for releasing the internal pressure of the back pressure chamber of each piston to the drain passage 26a on the atmosphere side to improve the operation of the pistons. Reference numeral 39 denotes a partition wall, which is an intermediate partition of the relief cylinder 28.

FIG. 6 shows a state in which the conveying oil passage 24 is in a high pressure state. When the balance piston 30 substantially completely compresses the balance spring 37 by the pressure of the balance chamber 29 and moves the leak hole 35 to the substantially fully open side, the conveying oil passage 24 is conveyed. The durability is improved by preventing the internal pressure of the oil passage 24 from increasing more than necessary when the oil pump 3 is driven at a high speed. As described above, since the leak hole 35 acts as a throttle valve, it is described as a large opening in the illustrated example. However, if the hole diameter is too large for internal pressure balance, the pressure fluctuates greatly, and if the hole diameter is small, the pressure varies with the pump discharge pressure. A delicate cross-sectional area is required.

[0014]

According to the present invention, the present invention
The following specific technical effects are exhibited. That is, the plurality of oil paths 1, 1. . . An oil gallery 2 having
In the oil gallery 2, lubricating oil pumped by an oil pump 3 is supplied through an oil filter 4 to an inlet 2a of the oil gallery 2. In the oil gallery 2, an oil passage 1 that is farther from the inlet 2a has a larger passage sectional area. Since the lubricating oil guide device is characterized in that the lubricating oil can easily flow into the oil passage 1 provided at a position far from the oil gallery 2, overheating and abnormal wear of the lubricating portion can be reduced. .

[Brief description of the drawings]

FIG. 1 is an explanatory development view of a lubricating oil passage.

FIG. 2 is an overall side view of the engine with a partial cross section.

FIG. 3 is a partially sectional rear view of the engine.

FIG. 4 is a partially sectional front view of the engine.

FIG. 5 is an explanatory view of another essential part, that is, a relief valve at low pressure.

FIG. 6 is an explanatory diagram at the time of high pressure in FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 oil passage 2 oil gallery 3 oil pump 4 oil filter

Claims (1)

[Claims] 1. A plurality of oil passages 1, 1. . . The oil gallery 2 is provided with a lubricating oil pumped by an oil pump 3 and supplied to an inlet 2a of the oil gallery 2 through an oil filter 4. A lubricating oil guide device characterized in that the cross-sectional area of the passage becomes larger as the passage becomes larger.