JPH0113767Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an engine lubrication system, and in particular to an oil supply path to a cylinder head of the engine lubrication system.

Conventionally, after the oil stored in the oil pan is forced into the main oil passage by an oil pump, this oil is distributed and supplied to the crankshaft part on the cylinder head side and each part of the camshaft on the cylinder block side. Engine lubricating devices that lubricate various parts of a camshaft are known.

In such an engine lubricating system, an orifice is installed in the oil passage bored in the cylinder head or cylinder block in order to distribute the appropriate amount of oil between the crankshaft and each part of the camshaft. Ru.

(Problem that the invention aims to solve) However, in the conventional engine lubricating system described above, when the engine stops operating, oil flows backward through the oil passage, so when the engine is restarted, the cylinder head There was a time delay in the oil supply to the engine, making it impossible to supply oil quickly.

In addition, since the orifice is interposed in the oil passage formed in the cylinder head or cylinder block, there is a problem that the engine assembly process becomes complicated.

Therefore, the purpose of this invention is to reduce the time delay in supplying oil to the cylinder head when restarting the engine, without deteriorating the ease of assembling the engine and minimizing the increase in engine size. To provide an engine lubricating device capable of solving the problem and realizing prompt oil supply.

(Means for Solving the Problems) In order to achieve the above object, the present invention is to pump the oil stored in the oil pan to the main oil passage by an oil pump, and then transfer the oil to the crankshaft portion and the cylinder block side. A check valve that allows oil to flow only from the cylinder block side oil passage to the cylinder head side oil passage, in an engine lubricating system that distributes and supplies oil to various parts of the camshaft through a passage and a cylinder head side oil passage. An orifice is provided in the upstream oil passage of the check valve integrally with the check valve, and a spring is provided in the downstream oil passage of the check valve to bias the check valve in the closing direction. One end is inserted into the cylinder block side oil passage to form a part of this oil passage, and the other end is fitted into the cylinder head side oil passage to form a part of this oil passage. Features.

(Function) According to this type of engine lubricating device, the orifice is provided integrally with the check valve, and this check valve is arranged on the tightening surface of the cylinder head and cylinder block, which reduces assembly man-hours and the number of parts. This also makes it possible to position the cylinder head and cylinder block.

In addition, since the oil pressure is lower on the downstream side of the orifice than on the upstream side, by providing the check valve on the downstream side of the orifice, the valve body and spring that make up the check valve can be made smaller and lighter. The overall size can be reduced. Therefore, there is no need to unnecessarily enlarge the cylinder block side oil passage and the cylinder head side oil passage into which the check valve is inserted, and bulging of the cylinder block and cylinder head can be minimized.

Even if the engine is stopped, the check valve prevents the oil remaining in the cylinder head oil passage from flowing backwards, so when the engine is restarted, the oil remaining in the cylinder head oil passage will remain in the cylinder head oil passage. The oil is immediately used for lubrication, and there is no time delay in oil supply.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a block diagram of an oil supply system of a lubricating device according to the present invention, FIG. 2 is a diagram showing an oil supply path to a cylinder head of the same device, and FIG. 3 is a cutaway side view of a check valve.

In the oil supply system shown in FIG. 1, oil in an oil pan 1 provided at the bottom of the engine is pumped up by an oil pump 3 via an oil strainer 2, and then regulated by a hydraulic regulator 4.
The oil is fed under pressure into the main oil passage 5. A portion of this pressure-fed oil is supplied to the crankshaft 6 portion on the cylinder block A side, and the other oil is supplied to the camshaft 7 on the cylinder head B side. That is, the oil supplied to the crankshaft 6 portion is supplied to each part of the crankshaft 6 via oil passages 8 branched from the main oil passage 5, and the oil supplied to the camshaft 7 portion is supplied to each part of the crankshaft 6 through the oil passages 8 branched from the main oil passage 5. The oil is supplied to each part of the camshaft 7 through the cylinder block side oil passage 15 connected to the 5th end, the cylinder head side oil passage 25, the oil passage 35 formed in the hollow rocker arm shaft 9, and the oil passage 10 branched by this. be done. In addition, in Fig. 1, 11 is a piston, 1
2 is the Rotzker arm.

By the way, as shown in FIG. 2, a check valve 13, the details of which are shown in FIG. 3, is provided between the cylinder block side oil passage 15 and the cylinder head side oil passage 25. This check valve 13 is connected to a valve case 1 as shown in FIG.
4, a ball 15a is urged downward by a spring 16, and the ball 15a is seated to close an oil passage 17 formed in the valve case 14 from above. And, in the middle of oil passage 17,
As shown in the diagram, orifice 1 is used to maintain proper oil distribution between cylinder block A and cylinder head B.
8 are integrally provided.

During engine operation, the oil supplied to the cylinder head B side flows through the main oil passage 5 and flows through the cylinder block side oil passage 1.
5. The oil passes through the orifice 18 provided integrally with the check valve 13, and its pressure pushes up the ball 15a against the elastic force of the spring 16, thereby opening the check valve 13 and the cylinder head side oil passage 2.
5. The oil is supplied to each part of the camshaft 7 through the oil passage 35 and the oil passage 10 in the rocker arm shaft 9.

When the engine is then stopped, the check valve 13 is closed, so the oil supplied to the cylinder head B side is prevented from falling by the check valve 13, and the oil remains on the cylinder head B side. Then, when the engine is restarted next time, the oil remaining on the cylinder head B side can immediately start lubricating each part of the camshaft 7, so there is no time delay in oil supply to the camshaft 7, and the oil can be quickly supplied to the camshaft 7. lubrication is possible.

In addition, an orifice 18 is provided integrally with the check valve 13, and the check valve 13 is disposed on the tightening surface of the cylinder block A and the cylinder head B, so that it is possible to reduce assembly man-hours and the number of parts. This also makes it possible to position the cylinder head B.

Furthermore, since the oil pressure is lower on the downstream side of the orifice 18 than on the upstream side, by providing the check valve 13 on the downstream side of the orifice 18, the ball 15a and the spring 16 that make up the check valve 13 can be made smaller and lighter. As a result, the entire check valve 13 can be made smaller. Therefore, the cylinder block side oil passage 15 and the cylinder head side oil passage 2 into which the check valve 13 is inserted are installed.
There is no need to unnecessarily enlarge the cylinder block A and the cylinder head B, and the bulging of the cylinder block A and the cylinder head B can be minimized.

(Effects of the invention) As is clear from the above explanation, according to the invention, the number of assembly steps and number of parts can be reduced, and
The positioning of the cylinder head and cylinder block is now possible, which improves the ease of assembling the engine.In addition, the bulge of the cylinder block and cylinder head can be kept to a minimum, so the size of the engine can be minimized. Moreover, when the engine is restarted, the oil remaining in the oil passage on the cylinder head side is immediately used for lubrication by the check valve, so there is no time delay in oil supply.

Therefore, it is possible to improve the ease of engine assembly, minimize the increase in engine size, and prevent delays in oil supply when restarting the engine, realizing prompt oil supply. Then you can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an oil supply system of a lubricating device according to the present invention, FIG. 2 is a diagram showing an oil supply path to a cylinder head of the same device, and FIG. 3 is a cutaway side view of a check valve. In the drawings, 3 is an oil pump, 5 is a main oil passage, 6 is a crankshaft, 7 is a camshaft, 13 is a check valve, 18 is an orifice, A is a cylinder block, and B is a cylinder head.

Claims (1)

[Scope of Claim for Utility Model Registration] After the oil stored in the oil pan is forced into the main oil passage by an oil pump, it is transferred to the camshaft through the crankshaft, cylinder block side oil passage, and cylinder head side oil passage. An engine lubricating system for distributing and supplying oil to various parts includes a check valve that allows oil to flow only from the cylinder block side oil passage to the cylinder head side oil passage, and an oil passage upstream of the check valve. An orifice is provided integrally with the check valve, a spring is provided in the oil passage on the downstream side of the check valve to bias the check valve in the closing direction, and one end of the check valve is inserted into the oil passage on the cylinder block side. 1. A lubricating device for an engine, wherein the other end is inserted into the cylinder head side oil passage to form a part of the oil passage.