JPH0754564Y2 - Engine lubrication oil supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for supplying lubricating oil to a sliding portion or the like in an engine mounted on an automobile, a motorcycle or the like.

[Prior Art] As a device of this type, the present applicant has devised a device shown in Japanese Utility Model Laid-Open No. 64-11312.

This device sucks the lubricating oil stored in the oil pan provided in the lower part of the engine from the oil strainer by the oil pump operated by the rotation of the engine, passes it through the oil filter, and then pumps it to each sliding part. It is supplied and then returned to the oil pan.When the oil pressure of the lubricating oil to be pumped rises above a certain level in the middle of the lubricating oil passage from the oil strainer to the oil filter, the lubricating oil will enter the oil pan. An oil relief valve for returning and adjusting the hydraulic pressure is provided. The strainer chamber and the relief valve chamber are partitioned by a partition wall lower than the oil level of the lubricating oil in the oil pan.

According to this, since the lubricating oil in the strainer chamber is sucked into the oil strainer, bubbles generated by the lubricating oil discharged from the oil relief valve are not directly sucked by the oil strainer, and the bubbles are It is hard to mix with the lubricating oil that is pumped.

[Problems to be Solved by the Invention] In the above-mentioned device, a communication passage that connects both chambers is formed in the lower part of the partition wall. For example, when the engine is rotated at high speed and the suction pressure of the oil strainer increases, Even if the communication passage extends downward with respect to the strainer chamber, it is conceivable that the bubbles may flow into the strainer chamber through the communication passage and be directly sucked from the oil strainer.

The present invention has been made in view of the above circumstances, in which bubbles generated by the lubricating oil discharged from the oil relief valve are not sucked from the oil strainer, and the bubbles are mixed into the lubricating oil to be pumped. Prevention,
An object of the present invention is to provide a lubricating oil supply device for an engine that can obtain an effective lubricating action.

[Means for Solving the Problems] The present invention has been made in order to achieve the above-mentioned object, and an oil pan for storing lubricating oil, which is provided in a lower portion of an engine, has a first chamber inside the oil pan. And a second partition are provided, and a suction port of an oil pump for lubricating hydraulic pressure is opened in the first chamber, and a hydraulic pressure adjusting oil connected to the oil pump is provided in the second chamber. In a lubricating oil supply device for an engine in which an oil discharge port of a relief valve is opened, a communication passage that connects the first chamber and the second chamber is formed in the partition wall, and the communication passage is appropriately elastic. It is characterized in that it is closed by a tongue piece having.

[Operation] According to the engine lubricating oil supply device of the present invention, as the lubricating oil in the first chamber is sucked from the oil strainer by the operation of the oil pump, the tongue piece is elastically deformed toward the first chamber side and is continuously connected. The passage opens and the lubricating oil in the second chamber flows into the first chamber through the communication passage. On the other hand, even if some of the bubbles generated by the operation of the oil relief valve try to flow into the first chamber through the communication passage, the bubbles are blocked by the tongue and hardly flow into the first chamber. Almost no bubbles are mixed in the oil, and the lubricating action works effectively.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall side view of a motorcycle 1. The motorcycle 1 includes a vehicle body frame 2, a front fork 3 rotatably supported by a front end of the vehicle body frame 2, and a front fork 3 attached to the front fork 3. Steering wheel 4
And a front wheel 5 rotatably supported by the front fork 3.
A rear fork 6 swingably supported at the rear end of the body frame 2, a rear wheel 7 rotatably supported by the rear fork 6, and a fuel tank disposed above the body frame 2. 8 and a seat 9 arranged behind the fuel tank 8.

A front cowl 10 and a rear cowl 11 are mounted on the front and rear of the motorcycle 1 so as to cover the vehicle body. Inside the front cowl 10, a water-cooled multi-cylinder engine 12 according to the present invention is installed. An upper radiator 13 and a lower radiator 14 which are arranged in front of the vehicle radiator 12 for cooling the engine 12 are stored in a state of being supported by the vehicle body frame 2.

The engine 12 has a crankcase 15 as shown in FIG.
Cylinders on the front bank side
It is a so-called V-type engine that is divided into 16 and the cylinder 17 on the rear bank side.
The carburetors 18 and 19 for supplying the air-fuel mixture are provided in the inside of the space 17.

Each of the cylinders 16 and 17 is composed of a cylinder block 20, a cylinder head 21 and a cylinder head cover 22 which are integrated with each other. Inside the cylinders 16 and 17, a crankshaft 23 in a crankcase 15 is connected to a crankshaft 23 via a connecting rod 23a. Piston 24 connected, two camshafts 25, 26 rotated by crankshaft 23, intake side and exhaust side valves 27, 28 operated by these camshafts 25, 26, piston 24 and cylinder head 19 A combustion chamber 29 and the like formed by and are provided.

A lubricating oil supply device 30 according to the present invention is installed below the engine 12.

As shown in FIG. 3, the lubricating oil supply device 30 is integrally fixed to the lower portion of the crankcase 15 and has a lubricating oil L inside.
Oil pan 31, an oil strainer 32 immersed in the lubricating oil L, an oil pump 34 mounted in the crankcase 15 and connected to the oil strainer 32 via an oil passage pipe 33a, and the crankcase 15 Of oil filter 35 fixed to the front part (right side in FIG. 3) of oil and connected to oil pump 34 through oil passage pipe 33b, and oil passage pipe
The oil relief valve 36 is provided in the middle of 33b and is immersed in the lubricating oil L.

The oil pump is actuated by the rotation of the engine 12, sucks the lubricating oil L from the suction port 32a of the oil strainer 32, sends it from the oil passage pipe 33a to the oil filter 35 via the oil passage pipe 33b, and then is formed in the engine 12. The sliding parts in the engine 12 (for example, crankshaft 23, piston 24, camshaft 25,
Supply to sliding parts such as 26). Lubricating oil L that has finished the lubricating action
Is returned to and stored in the oil pan 31, and is circulated again through the above-mentioned path.

In this circulation of the lubricating oil L, when the hydraulic pressure of the lubricating oil L to be pumped increases and reaches a certain constant hydraulic pressure, for example, as the engine 12 rotates at high speed, the oil relief valve 36 operates and the oil passage pipe 33b. An appropriate amount of the lubricating oil L passing through is returned to the oil pan 31 and is adjusted so that the hydraulic pressure does not rise any further.

This oil relief valve 36 is urged by a spring 38 into an outer cylinder 37 having a bottomed cylindrical shape, which communicates with the oil passage pipe 33b and has a discharge port 37a for the lubricating oil L formed in its body. Usually, the inner cylinder 39 that closes the discharge port 37a is housed, and when the lubricating oil L passing through the oil passage pipe 33b reaches a certain hydraulic pressure as described above, the lubricating oil L causes the inner cylinder 39 to spring. By moving against 38, the discharge port 37a is opened and the lubricating oil L is discharged from the discharge port 37a into the oil pan 31. Then, when the oil pressure of the lubricating oil L passing through the oil passage 33b is lowered by this operation, the inner cylinder 39 is returned to the original position by the spring 38 and the discharge port 24a is closed.

By the way, in the oil pan 31, a partition wall 40 is provided for partitioning the oil pan 31 into the oil strainer 32 side and the oil relief valve 36 side, and the oil strainer 32 side is the first chamber 41 and the oil relief valve 36 side is the second side. It is said to be room 42. That is, the suction port 32a of the oil strainer 32 is opened in the first chamber 41, and the oil relief valve 36 is provided in the second chamber 42.
The outlet 37a for the lubricating oil L is open.

As shown in FIGS. 3 and 4, the partition wall 40 is in the shape of an L-shaped plate, and is erected substantially vertically to the bottom of the oil pan 31, and its height is within the oil pan 31. It is set lower than the oil level L _{1 of the} stored lubricating oil L. An end surface of the partition wall 40 facing the inner surface of the oil pan 31 is slightly apart from the inner surface of the oil pan 31, and thereby a communication passage 43 between the two chambers 41 and 42 is formed. A tongue piece 44 that normally closes the communication passage 43 is attached to the end of the partition wall 40.

The tongue piece 44 is made of a material such as rubber having appropriate elasticity, and the thick base portion 44a is fitted to the end portion of the partition wall 40.
The tip of the thin tongue portion 44b just closes the inner surface of the oil pan 31 to close the communication passage 43, but when the engine 12 reaches a certain rotational speed, the flow of the lubricating oil L sucked from the oil strainer 32 causes the first chamber to flow. The communication passage 43 is opened by elastically deforming to the 41 side.

The operation of the lubricating oil supply system of the present embodiment having the above structure will be described below.

As the lubricating oil L in the first chamber 41 is sucked from the oil strainer 32 by the operation of the oil pump 34, the tongue portion of the tongue piece 44 is
44b elastically deforms toward the first chamber 41 to open the communication passage 43, and the lubricating oil L in the second chamber 42 flows into the first chamber 41 through the communication passage 43. Lubricating oil L drawn from the oil strainer 32
After being filtered by the oil filter 35 through the respective oil passage pipes 33a and 33b, after being sent to the respective sliding portions as described above,
Returned to the oil pan 31.

On the other hand, when the oil pressure of the lubricating oil L circulated by the oil pump 34 becomes high, the oil relief valve 36 operates and the lubricating oil L is returned from the discharge port 37a of the oil relief valve 36 into the oil pan 31.

Then, the bubbles generated at this time rise in the lubricating oil L, but some of them are mixed with the flow of the lubricating oil L which is about to flow into the first chamber 41 from the communication passage 43 as described above. There is. However, since the flow of the air bubbles is blocked by the tongue piece 44, the air bubbles hardly flow into the second chamber 42, and rise along the wall surface of the partition wall 40. That is, the lubricating oil L flowing from the second chamber 42 into the first chamber 41 through the communication passage 43 contains almost no bubbles.

Therefore, the oil pump 34 causes the oil strainer 32 to
The bubbles are not mixed in the lubricating oil L that is sucked in and circulated from the
Lubrication works effectively.

Although the present invention is applied to a motorcycle engine in the present embodiment, the present invention is not limited to this, and the present invention can be applied to an automobile or other engine having a similar format.

[Advantages of the Invention] As described above, according to the engine lubricating oil supply device of the present invention, the inside of the oil pan is provided in the lower portion of the engine for storing the lubricating oil and the first chamber and the second chamber. A partition wall is provided for partitioning the chamber with the chamber, an inlet of an oil pump for lubricating hydraulic pressure is opened in the first chamber, and an oil relief valve for hydraulic pressure adjustment connected to the oil pump is provided in the second chamber. In a lubricating oil supply device for an engine having an oil discharge port opened, a communication passage for communicating the first chamber and the second chamber is formed in the partition wall, and the communication passage has a tongue having an appropriate elasticity. Since it is characterized in that it is blocked by one piece, the air bubbles generated by the operation of the oil relief valve are blocked by the tongue piece and hardly flow into the first chamber, so that the air bubbles are not present in the lubricating oil to be supplied. It has the effect that the lubricating action works effectively with almost no mixing.

[Brief description of drawings]

1 to 4 are views showing an embodiment of the present invention. FIG. 1 is an overall side view of a motorcycle to which the embodiment is applied, and FIG. 2 is a partial sectional side view of an engine. FIG. 3 is a side sectional view of a lubricating oil supply device of one embodiment, and FIG. 4 is a perspective view of an oil pan and its inside. 1 ... Motorcycle, 30 ... Lubricating oil supply device, 31 ... Oil pan, 32 ... Oil strainer, 32a ... Suction port, 34
…… Oil pump, 36 …… Oil relief valve, 37a
...... Discharge port, 40 ...... Partition wall, 41 ...... First chamber, 42 ...... Second chamber, 44 ...... Tongue piece, L ... Lubricating oil.

Claims (1)

[Scope of utility model registration request] 1. A partition for partitioning the inside of the oil pan into a first chamber and a second chamber is provided in an oil pan provided in the lower portion of the engine for storing lubricating oil, and a lubricating oil pressure is sent to the first chamber. A lubricating oil supply device for an engine, in which an intake port of an oil pump for a vehicle is opened, and an oil discharge port of an oil pressure relief valve for hydraulic pressure connected to the oil pump is opened in the second chamber. A lubricating oil supply device for an engine, characterized in that a communication passage that connects the first chamber and the second chamber is formed, and the communication passage is closed by a tongue piece having appropriate elasticity.