KR100367671B1 - Oil sub-relief valve of engine - Google Patents

Abstract

The present invention relates to an oil auxiliary relief valve of an engine oil supply system, comprising an oil pump installed at a boundary point of a suction passage for sucking oil from an oil pan and a supply passage for supplying oil to the engine, and the supply passage and the suction passage. The engine consists of a relief valve chamber installed on the bypass passage connecting the valve and an oil relief valve elastically installed in the elastic spring supported by the relief pressure adjusting bolt screwed to the relief valve chamber to elastically open and close the bypass passage. An oil supply system comprising: a diaphragm case fixed to a plurality of supports protruding from a bottom of a relief pressure adjusting bolt screwed to the relief valve chamber, and having a vacuum induction pipe for vacuum formed at a lower portion thereof; A diaphragm which partitions the inside of the diaphragm case into a vacuum upper and lower parts and is elastically supported by a spring mounted to the lower part; A valve rod which penetrates through an upper portion of the diaphragm case and a central portion of each of the relief pressure adjusting bolts so that an upper end thereof extends to a position close to an oil relief valve, and a lower end thereof is supported by a diaphragm; The invention is characterized in that it is fixed to the upper end of the valve rod, constitutes an auxiliary relief valve for opening and closing the bypass valve hole formed in the center of the oil relief valve.

Description

Oil sub-relief valve of engine oil supply system

The present invention bypasses the oil supplied to the engine during the cold start of the engine to the oil pan to shorten the cold start time and at the same time the oil auxiliary relief of the engine oil supply system that can protect the oil circulation system from excessive pressure It is about a valve.

In the vehicle, the oil relief valve is configured to bypass the supplied oil pressure to the oil pan when the oil pressure supplied to the engine is above the prescribed set pressure to prevent the oil circulation system from being damaged by the excessive pressure of the oil. In addition, it plays an important role in protecting the engine.

In the prior art, as illustrated in FIG. 3, the oil pump 100 sucks oil from an oil pan (not shown) through the suction passage 101 to supply oil to the oil circulation system of the engine through the supply passage 102. And a bypass passage 103 is formed between the suction passage 101 and the supply passage 102, and then an oil relief elastically supported by the elastic spring 202 in the valve chamber 201 formed on the bypass passage. The valve 200 is provided.

In addition, the oil relief valve 200 is a means for adjusting by varying the elastic pressure of the elastic spring 202 by the operation of screwing or unscrewing the relief pressure adjusting bolt 203 screwed to one side of the valve chamber 201 The oil relief valve 200 is adjusted to close the bypass passage 103 when the normal pressure of the oil supplied to the supply passage 102, that is, the oil is supplied to the supply passage at a predetermined set pressure. In addition, when oil is supplied above a predetermined set pressure, the oil relief valve 200 overcomes the force of the elastic spring 202 and opens the bypass passage 103 so that the oil bypasses the bypass passage 103. In order to prevent oil pressure above the set pressure from being supplied to the engine oil system, it is possible to protect the oil system from damage caused by excessive pressure. It is.

However, the prior art as described above has been pointed out as a problem that it does not adequately cope with the increase of the viscosity of the engine oil due to the low temperature during the cold of the engine, not only does the start-up time increase during cold start but also the excessive pressure is supplied to the oil circulation system.

The viscosity of the engine oil increases with decreasing temperature, especially as it decreases below freezing.

Therefore, when the engine is cold-started, the high-viscosity oil of a low temperature in the oil pan is supplied to the oil circulation system of the engine through the supply passage 102 by the operation of the oil pump 100. At this time, since the supplied oil has a high viscosity, Accordingly, the fluid friction force is large, which hinders the increase of the engine speed, thereby making the engine difficult to start. As a result, the startup time is lengthened during cold start, and the oil pump 100 supplies the oil to the oil circulation system during cold start. In light of this, the high temperature oil of low temperature inside the engine is not depreciated quickly by the oil pan, and the oil relief valve 200 cannot be operated quickly due to the large fluid friction, so the oil circulation system is momentarily excessive. The problem of supplying pressure oil appears.

The present invention was created in order to solve the problems described in the prior art as described above, the engine is cold-cooled by means of additionally mounting the auxiliary relief valve on the oil relief valve which is a safety device installed so that the oil of excessive pressure is not supplied to the engine Simultaneous auxiliary relief valve operates to bypass oil supplied by the oil pump to the oil pan to prevent excessive supply of high-viscosity oil to the engine's oil circulation system to improve engine cold startability. The present invention has been invented for a different purpose in order to protect the oil circulation system from excessive pressure.

The present invention as a means for achieving the above object,

An oil pump installed at a boundary point between a suction passage for sucking oil from the oil pan and a supply passage for supplying oil to the engine, a relief valve chamber installed on a bypass passage connecting the supply passage and the suction passage, and the relief valve In the oil supply system of the engine consisting of an oil relief valve for elastically opening and closing the bypass passage by elastically installed on the elastic spring supported by the relief pressure adjustment bolt screwed in the seal,

A diaphragm case fixedly installed at a plurality of supports protruding from a bottom of a relief pressure adjusting bolt screw-assembled in the relief valve chamber, and having a vacuum induction pipe for vacuum formed therein;

A diaphragm which partitions the inside of the diaphragm case into a vacuum upper and lower parts and is elastically supported by a spring mounted to the lower part;

A valve rod which penetrates through an upper portion of the diaphragm case and a central portion of each of the relief pressure adjusting bolts so that an upper end thereof extends to a position close to an oil relief valve, and a lower end thereof is supported by a diaphragm;

An auxiliary relief valve fixedly installed at an upper end of the valve rod to open and close a bypass valve hole formed at a center of the oil relief valve;

It is characterized by the configuration.

1 is an installation state of the auxiliary relief valve for explaining the present invention.

Figure 2 is an open operating state of the auxiliary relief valve of the present invention.

3 is a prior art

※ Explanation of code for main part of drawing

1: Oil pump 2: Suction passage

3: Supply passage 4: Bypass passage

5: Valve room 6: Oil relief valve

7: Elastic spring 8: Relief pressure adjusting bolt

9: auxiliary relief valve 61: bypass valve ball

91: support 92: diaphragm case

92a, 92b: upper and lower 93: diaphragm

94: spring 95: valve rod

96: vacuum induction pipe

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an installation state diagram of the auxiliary relief valve for explaining the present invention, Figure 2 is a view showing an open operation state of the auxiliary relief valve of the present invention,

Reference numeral 1 denotes an oil pump, and the oil pump 1 is installed at a boundary point between the suction passage 2 and the supply passage 3 of the oil supply system, and is driven together when the engine is started to drive an oil pan (not shown). It is responsible for supplying and circulating the oil stored in the pump to the engine oil circulation system.

The supply passage 3 and the suction passage 2 are connected by a bypass passage 4, and a valve chamber 5 is formed in the bypass passage 4.

The oil relief valve 6 installed in the valve chamber 5 is provided to open and close the bypass passage 4 directly communicating with the supply passage 3, and the oil relief valve 6 is provided. It is elastically supported by an elastic spring (7) installed in the valve chamber (5), the elastic force of the elastic spring (7) is screwed to the screw of the relief pressure adjusting bolt (8) which is screwed to seal the valve chamber (5) Is adjusted according to the condition.

That is, the elastic force of the elastic spring 7 is the oil relief valve 6 seals the bypass passage 4 when the oil pressure circulating in the oil circulation system maintains the prescribed set pressure, The oil relief valve 6 is configured to elastically open the bypass passage 4, and the elastic force adjustment of the elastic spring 7 is performed by adjusting the screw engagement state of the relief pressure adjusting bolt 8. It is configured to

The present invention is characterized in that the auxiliary relief valve 9 is additionally installed in the oil relief valve 6 configured as described above.

To this end, the upper portion 92a of the diaphragm case 92 is fixedly attached to the plurality of supports 91 protruding from the bottom of the relief pressure adjusting bolt 8, and the inside of the diaphragm case 92 is The upper and lower parts 92a and 92b are partitioned in a vacuum state by the diaphragm 93, and the diaphragm 93 is configured to be elastically supported by a spring 94 installed in the lower part 92b. .

The auxiliary relief valve 9 has a lower end of the valve rod 95 having an upper end integrally coupled to the bottom thereof. The lower end of the auxiliary relief valve 9 moves up and down the center of the relief pressure adjusting bolt 8 and the center of the upper part 92a of the diaphragm case 92. It is installed to have a structure supported by the diaphragm 93 so as to penetrate through it, and is configured to elastically open and close the bypass valve hole 61 formed at the center of the oil relief valve 6.

In addition, the auxiliary relief valve (9) is formed in a conical shape, while the bypass valve hole (61) drilled in the center of the oil relief valve (6) is formed in a reverse cone shape in cross section.

In addition, a vacuum induction pipe 96 is connected to a lower portion 92b of the diaphragm case 92 so as to generate a vacuum pressure in the lower portion 92b of the diaphragm case 92. It is composed.

The diaphragm 93 is operated by a vacuum pump controlled by an electronic control unit (ECU) (not shown), and the vacuum pump is driven together with the oil pump 1 when the electronic control unit is recognized as cold start. Therefore, since a vacuum pressure is generated in the vacuum induction pipe 96, a vacuum pressure is also generated in the lower portion 92b of the diaphragm case 92, and the diaphragm 93 is spring 94 by the generated vacuum pressure. To overcome the elastic force of the lower portion (92b), that is, the direction in which the vacuum pressure is generated, the valve rod 95 is to open the auxiliary relief valve (9), the vacuum pump after the engine is started When the operation is stopped, the vacuum is broken, and the diaphragm 93 is returned to its original state by the elastic return force of the spring 94 to close the auxiliary relief valve 9.

The auxiliary relief valve 9 of the present invention does not operate when the oil circulating in the oil circulation system of the engine maintains a normal viscosity, and closes the bypass valve hole 61 of the oil relief valve 6. It operates as the oil relief valve 6 as a state, and the oil in the oil circulation system and the oil pan of the engine is higher than the normal viscosity, that is, it operates only during cold start of the engine. The operation is described as follows.

Along with the oil pump 1 when the engine is cold started, a vacuum pump (not shown) for generating a vacuum pressure in the lower portion 92b of the diaphragm case 92 is also driven.

As described above, the oil pump 1 driven during cold startup starts pumping the high viscosity oil of low temperature in the oil pan and supplying it to the supply passage 3 and at the same time the lower portion 92b of the diaphragm case 92. A vacuum relief is generated in the diaphragm 93 to elastically compress the spring 94, while lowering the valve rod 95 as shown in Figure 2, the auxiliary relief valve coupled to the upper end of the valve rod 95 (9) opens the bypass valve hole 61 of the oil relief valve (6).

Therefore, the high-viscosity oil supplied to the supply passage 3 by the oil pump 1 is bypassed toward the oil pan through the open bypass valve hole 61 without moving to the oil circulation system. As the oil in the oil circulation system is not in a large amount, the temperature rises rapidly due to the driving of the engine, and the low viscosity state is performed, thus performing the normal lubrication function. When the oil is circulated to a low viscosity, the electronic controller recognizes this and stops the operation of the vacuum pump. When the vacuum pump stops driving, at the same time, the vacuum acting on the lower portion 92b of the diaphragm case 92 Since the overwhelmingly destroyed in a moment, the spring 94, which was previously compressed, elastically returns and moves the diaphragm 93 to its original state. As a result, the auxiliary relief valve 9 seals the vari-pass valve hole 61 of the oil relief valve 6.

As described above, when the auxiliary relief valve 9 is closed, the oil pumped by the oil pump 1 is normally circulated to the oil circulation system of the engine.

Applicant has a vehicle equipped with the auxiliary relief valve 9 in the oil relief valve 6 as in the present invention, and an existing vehicle equipped with only the oil relief valve, and is cooled under the same temperature, for example, a temperature of minus 20 degrees. As a result of the start-up test, it was confirmed that the conventional vehicle takes about 17 seconds for the cold start time, while the vehicle equipped with the auxiliary relief valve 9 of the present invention is shortened to about 6 seconds.

As described above, the present invention prevents the phenomenon of supplying the oil pressure higher than the set pressure defined by the oil circulation system while at the same time preventing the high precision oil from being supplied to the oil circulation system during the cold start of the engine. Since the engine is driven only by the oil remaining in the oil circulation system, the oil with high viscosity in the oil circulating system rapidly rises to a low viscosity and changes to a low viscosity to perform lubrication functions normally, thereby improving the cold startability of the engine and shortening the cold start time. In addition, the oil circulating in the engine oil circulation system has the effect of protecting the oil circulation system from excessive pressure by allowing the oil to be circulated under the specified set pressure, and also reducing the amount of starting fuel during cold start and unnecessary initial oil consumption. Bags generated during cold start can be prevented It can be reduced and more.

Claims (1)

An oil pump installed at a boundary point between a suction passage for sucking oil from the oil pan and a supply passage for supplying oil to the engine, a relief valve chamber installed on a bypass passage connecting the supply passage and the suction passage, and the relief valve In the oil supply system of the engine consisting of an oil relief valve that is elastically installed on the elastic spring supported by the relief pressure adjustment bolt screw-assembled in the seal to elastically open and close the bypass passage, A diaphragm case fixedly installed at a plurality of supports protruding from a bottom of a relief pressure adjusting bolt screw-assembled in the relief valve chamber, and having a vacuum induction pipe for vacuum formed therein; A diaphragm which partitions the inside of the diaphragm case into a vacuum upper and lower parts and is elastically supported by a spring mounted to the lower part; A valve rod which penetrates through an upper portion of the diaphragm case and a central portion of each of the relief pressure adjusting bolts so that an upper end thereof extends to a position close to an oil relief valve, and a lower end thereof is supported by a diaphragm; An auxiliary relief valve fixedly installed at an upper end of the valve rod to open and close a bypass valve hole formed at a center of the oil relief valve; Oil auxiliary relief valve of the engine oil supply system, characterized in that consisting of.