JPS606581Y2 - Internal combustion engine lubricating oil control device - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a lubricating device for a valve train in a rocker cover in which a blow-by gas reduction device is incorporated in an internal combustion engine, and is suitable for use during high-speed operation or high oil temperature. This invention relates to a lubricating oil control device that prevents oil from blowing out.

[Conventional technology]

In an internal combustion engine, a blow-by gas reduction device is provided from the crank chamber to the air cleaner side via an oil separator in a rocker cover, and a blow-by gas reduction device is provided to supply oil under pressure to the valve mechanism by an oil pump as a lubricating device for the valve mechanism in the rocker cover. Some devices are configured so that the oil after lubrication flows down the oil return passage in a natural fall manner.

[Problem that the invention attempts to solve]

By the way, when a lubrication device and a blow-by gas reduction device are installed together, the amount of oil discharged by the oil pump increases in proportion to the engine speed, and at the same time, the amount of oil supplied increases as the oil temperature increases. On the other hand, there is a limit to the amount of oil returned from the oil return passage, so during high-speed operation or high oil temperature, the amount of oil supplied to the valve mechanism exceeds the amount returned, causing oil to accumulate inside the rocker cover. This may cause oil to blow out from the blow-by gas outlet.

[Means for solving problems]

The present invention was developed to solve these problems, and it measures the oil pressure and oil temperature in the middle of the oil supply passage from the crankcase side to the valve mechanism in the rocker cover in which the blow-by gas reduction device is incorporated. An oil flow adjustment valve that detects and operates the oil flow control valve is installed, and when the oil pressure exceeds the set value during high-speed operation, or when the oil temperature exceeds the set value during high oil temperature, the oil flow adjustment valve throttles the oil passage and reduces the oil level. To provide a lubricating oil control device for an internal combustion engine, which prevents oil from accumulating in a rocker cover by reducing the rate of increase in .

In addition, regarding the provision of an oil amount adjustment valve, it is disclosed in Japanese Patent Application Laid-Open No. 49-7
No. 5943, JP-A-49-75944, JP-A-51-
Although there is a prior art related to the 734 Pine, its valve body structure is completely different.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In Fig. 1, an example of an internal combustion engine to which the present invention is applied will be described. Reference numeral 1 indicates a crankcase, and an oil pan 2 is attached to the bottom of the crankcase 1, and lubricating oil is supplied to the bottom of the crankcase 1. This oil is pumped up by an oil pump (not shown) and supplied to the journal portion of the crankshaft 4 through the oil passage 3.

Further, the oil in the oil passage 3 passes through oil supply passages 6 and 16 provided in communication with the crankcase 1 and the cylinder head 5 thereon, and then passes through the passage of the camshaft 9 in the valve mechanism 8 in the rocker cover 7. 10, etc., and is supplied to the journal portion of the camshaft 9, the cam surface of the cam 11, the sliding surface of the rocker arm 12, etc. to lubricate and cool each part.

The inside of the rocker cover 7 communicates with the oil pan 2 through an oil return passage 13 that is formed in communication with the crankcase 1 and the cylinder head 5, and oil that lubricates and cools the valve mechanism 8 and flows into the rocker cover 7. falls down the oil return passage 13 under its own weight and returns to the oil pan 2.

On the other hand, in contrast to such a lubricating device, the blow-by gas return device is such that the crank chamber 14 in the lower part of the crankcase 1 communicates with the rocker cover 7 through the blow pie gas passage 15, and is attached to the upper part of the rocker cover 7. An oil separator 17 that separates oil and gas is connected to an air cleaner 19 via a blow-by gas hose 18 so as to guide only blow-by gas.

In such a configuration, according to the present invention, a passage 6 for pressure-feeding oil from the crankcase 1 side to the valve mechanism 8 is provided.
, 16 is provided with an oil amount adjusting valve 20.

As detailed in FIG. 2, this oil amount adjusting valve 20 has a large-diameter valve chamber 21 formed at the end of the passage 6 on the crankcase 1 side, and a valve body 22 provided within this valve chamber 21. Tear down.

In the valve body 22, a pressure receiver 24 having a large diameter and having an oil passage hole 23 is movably fitted into the valve chamber 21 to detect oil pressure, and a thermo-operation mechanism 2 is attached to the pressure receiver 24 to detect oil temperature.
A valve portion 26 is provided via the valve portion 5, and a return spring 27 is biased to the valve portion 26.

The thermo-operation mechanism 25 has a housing 29 movably attached to a support rod 28 erected at the center of the pressure receiver 24, and the interior of the housing 29 is divided into two chambers 31 by a diaphragm 30.
．． 32, the chamber 31 on the side of the valve part 26 is filled with a temperature-sensitive substance 33 such as wax that expands due to temperature, and the chamber 32 on the side of the pressure receiver 24 is filled with an incompressible substance 34.

When the oil temperature exceeds the set oil temperature, the diaphragm 30 is deflected due to the expansion of the substance 33, and the housing 29 is moved forward through the incompressible substance 34.

Further, in the valve portion 26, a throttle passage 36 is bored in a passage member 35 integrally attached to the tip of the housing 29 in the shape of an inverted letter.
In addition, a collar 37 of a predetermined size is prevented from being removed by a stop ring 38 and is installed so as to be retractable against a spring 39 to communicate or block the passage 16 on the cylinder head 5 side.

Since the present invention is constructed in this manner, blow-by gas leaking from the cylinders of the crank case 1 into the crank chamber 14 during engine operation enters the rocker cover 7 through the blow-by gas passage 15, where it is collected by the oil separator 17. The oil component is separated and removed, and only the blow-by gas is sucked into the air cleaner 19 via the blow-up gas hose 18 and is again used for combustion.

Further, oil at the bottom of the oil pan 2 and the like is pumped by an oil pump and supplied to the journal portion of the crankshaft 4 through a passage 3 for lubrication, and at the same time is supplied to the valve mechanism 8 through a passage 6.

By the way, the oil in the passage 6 flows into the valve chamber 21 of the oil amount adjusting valve 20.
The oil pressure is detected by acting on the pressure receiver 24, and when the oil pressure is low during low to medium speed operation, the pressure receiver 24 is moved to a backward position by the spring 27 as shown in FIG.

In addition, oil passes through the through hole 23 of the pressure receiver 24 and enters the valve chamber 21.
The temperature of the oil is detected by flowing into the body and touching the housing 29 of the thermo-operating mechanism 25, and when the oil temperature is below the set oil temperature, the housing 29 is retracted to the side of the pressure receiver 24 as shown in FIG.

Therefore, when the oil pressure during low to medium speed operation is below the set value and the oil temperature is also below the set value, both the pressure receiver 24 and the housing 29 of the thermo-operating mechanism 25 move backward as shown in Fig. 2. The collar 37 is separated from the cylinder head 5 and communicates the valve chamber 21 with the passage 16.

Therefore, the oil flowing into the valve chamber 21 is directly supplied to the valve mechanism 8 through the passage 16 without flow rate control, and lubricates each part, and the lubricated oil flows from the rocker cover 7 to the oil return passage. 13 and is returned to the oil pan 2.

On the other hand, when the oil discharge pressure of the oil pump exceeds the set oil pressure during high-speed operation, the pressure receiver 24
detects this, and the entire valve body 22 together with the pressure receiver 24 moves toward the cylinder head 5 against the spring 27, as shown in FIG.
1 is blocked and the passage member 35 is inserted into the passage 16.

Therefore, the valve chamber 21 communicates with the passage 16 only through the throttle passage 36, and the oil is supplied from the passage 16 to the valve mechanism 8 while reducing the flow rate through the throttle passage 36. As a result, the oil amount is reduced to the fourth level. Decrease the increase rate as shown.

In this way, the amount of oil supplied to the valve mechanism 8 is limited to the amount necessary for lubrication and cooling during high-speed operation, and no excess oil flows into the rocker cover 7, and all oil after lubrication is transferred to the rocker cover 7. The oil sequentially flows down the oil return passage 13 without accumulating in the cover 7.

Furthermore, if the oil temperature rises due to continued high-load operation and exceeds the set oil temperature, and the oil supply amount also increases due to this influence, the thermo-operation mechanism 25 in the oil amount adjustment valve 20 This is detected, and the valve portion 26 is moved together with the housing 29 against the spring 27 as shown in FIG.

Therefore, in this case as well, the valve chamber 21 communicates with the passage 16 only through the throttle passage 36 to reduce the amount of oil supplied to the valve mechanism 8, and the rocker cover 7
Prevent excess oil from accumulating inside.

Incidentally, when both the oil pressure and the oil temperature exceed the set values, it goes without saying that the two operations shown in FIG.

[Effect of idea]

As described above, according to the present invention, when one or both of the oil pressure and oil temperature exceeds a set value and the amount of oil supplied to the valve mechanism 8 increases, the oil amount adjustment valve 20 adjusts the amount of oil. Since the oil is regulated and no longer accumulates in the rocker cover 7, the oil accumulated in the rocker cover 7 will not flow into the oil separator 17 of the blow-by gas reduction device and blow out.

Since the oil amount adjusting valve 20 is configured to operate by detecting both oil pressure and oil temperature, additional parts are not required and the structure is simple.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an embodiment of the device according to the present invention, Fig. 2 is a sectional view showing the main part of the oil flow regulating valve, and Fig. 3 a.
b is a sectional view showing the operating state, and FIG. 4 is a diagram showing the relationship between oil amount and engine speed. 1...Crankcase, 6,16...
Oil supply passage, 7...Rocker cover, 8
... Valve train mechanism, 17 ... Oil separator, 20 ... Oil amount adjustment valve, 21 ...
Valve chamber, 22 valve body, 24...pressure receiver, 25...
... Thermo-operation mechanism, 26 ... Valve section, 36
...Aperture passage, 37...Tsuba.

Claims (1)

[Scope of utility model registration request] An oil volume adjustment valve is provided in the middle of the oil supply passage from the crankcase side to the rocker cover internal valve mechanism that includes the oil separator of the blow-by gas reduction device, and the oil volume adjustment valve has a valve chamber communicating with the oil supply passage; A valve body is installed in the valve chamber, and a valve part is attached to a pressure receiver that detects oil pressure via a thermo-operation mechanism that detects oil temperature, and the valve part communicates with the oil supply passage. Alternatively, it is equipped with a blocking collar and a throttle passage, and when one or both of the oil pressure and oil temperature exceeds a set value, the collar blocks the oil supply passage and connects the throttle passage to reduce the rate of increase in oil amount. A lubricating oil control device for an internal combustion engine, characterized in that it is configured as follows.