KR20000045723A - Pressure adjuster of vehicle oil pump - Google Patents

Abstract

PURPOSE: A pressure adjuster is provided to regularly lubricate the main working part of an engine by regularly keeping oil pressure and oil flow of an oil pump without mis-operation of a relief valve caused by oil viscosity. CONSTITUTION: A relief valve(50) is open when oil pressure is more than regular pressure. Then a plunger(54) of the relief valve compresses an elastic member(60) and moves to the lower end of a housing(52) of the valve. The lower protrusion(58) of the plunger passes through a bypass channel(14) and then the bypass channel and flue hole(22) are coupled by the housing. Thus, the part of oil in a vent port(10) is sequentially inlet to the housing, the bypass channel and a suction port(6) to reduce vent pressure and flow of an oil pump.

Description

Pressure regulator of automobile oil pump

The present invention relates to a pressure regulating device for an automobile oil pump, and more particularly, to adjust a pressure and a flow rate of oil discharged to an engine by an oil pump to maintain a constant pressure of oil circulating in the engine. It relates to a pressure regulator of the oil pump.

As you know, the engines of automobiles rub against each other while they are rotating. In addition, many of them are subjected to very large loads and are often rubbed at high speed.

The forces used in these frictional parts are all resistances and losses to the forces obtained from the expansion stroke of the cylinder. In addition, friction between parts naturally causes wear of the parts, which shortens the life, and causes the overall performance of the engine to decrease.

Therefore, oil is supplied as lubricating oil in the engine to promote lubrication between components inside the engine.

The engine oil is collected in an oil pan mounted on the lower part of the engine, and the oil collected in the oil pan is pumped to an oil pump to filter foreign substances in the oil through the oil filter, and then scattered on the main moving part to reduce friction in the engine. It reduces the resistance and cools the inside of the engine.

In other words, the engine oil lubricates not only the main moving parts of the engine but also all the engines from the valve unit to the cylinders, and the frictional resistance of the lubrication to the crankshaft, connecting rod and piston of the main moving parts, This will greatly affect the cooling of the piston and cylinder. In addition, the airtightness of the piston and the cylinder is also maintained by the engine oil.

Referring to the accompanying drawings, an oil pump that pumps such oil from an oil pan and discharges it to an engine is as follows.

1 is a cross-sectional view illustrating a conventional automobile oil pump, and FIG. 2 is an exploded perspective view illustrating main parts of the inner and outer gears and the housing of the conventional oil pump.

As shown, the oil pump 2 is mounted on one side of the engine to pump the oil of the oil pan (not shown) to the oil filter to introduce the filtered oil into the engine.

One side of the housing 4 of the oil pump 2 is formed with a suction port 8 through which oil from the oil pan is sucked, and a discharge port 12 through which oil is discharged. On one side of the upper end of the spaced apart housing 4 is in communication with this is formed a discharge port (12a) in contact with the engine.

A stepped suction port 6 and a discharge port 10 are formed in the housing 4 on one side of the suction port 8 and the discharge port 12 of the oil pump 2, and the housing 4 has an outer gear. 18 is inserted and provided, and an inner gear 16 connected to a crankshaft (not shown) is eccentrically provided at the center of the outer gear 18.

On the other hand, a portion 20 in which the inner gear 16 and the outer gear 18 are spaced apart from each other is provided with a sickle 20, and the inner gear 16 and the outer gear 18 by the sickle 20. Rotated to move the oil introduced into the suction port 8 side toward the discharge port 12 side.

In addition, a communication port 22 communicating with the discharge port 10 is formed at one side of the housing 4 of the oil pump 2, and the front end of the relief valve 24 is connected to the communication port 22. .

A support plate 28 is provided at the inner end of the housing 26 of the relief valve 24, and an elastic member 30 is provided between the support plate 28 and the housing 26 to provide a restoring force to the support plate 28. Will be provided.

One side of the relief valve 24 is connected to the bypass flow passage 14 in communication with the suction port (6) is formed.

In the conventional oil pump of the vehicle, the crankshaft rotates when the vehicle starts, and the inner gear 16 in the oil pump 2 housing 4 rotates, and the outer gear 18 engaged thereto rotates. While pumping the oil stored in the oil pan into the oil pump (2).

Then, the oil is continuously pumped into the suction port 6 of the suction port 8 formed on one side of the housing 4 of the oil pump 2, and the oil is pumped into the oil pump 2, the inner gear 16 is rotated And oil flows between the gears of the outer gear 18 engaged with the oil, and moves to the discharge port 12 side of the housing 4.

At this time, the oil is introduced between the gears of the inner gear 16 and the outer gear 18 by the cycle 20 provided between the inner gear 16 and the outer gear 18 does not leak. .

As such, the oil moved to the discharge port 12 flows into the discharge port 10 in communication with the discharge port 12 and is discharged to the main moving part of the engine through the discharge port 12a in contact with the engine to lubricate the engine. Oil pressure is discharged at a constant pressure.

Thereafter, when the oil pressure discharged to the engine is equal to or higher than the predetermined pressure, the pressure in the oil pump 2 rises.

Then, the relief valve 24 provided at one side of the oil pump 2 is opened, and a part of the oil of the discharge port 10 discharged to the engine is suction port 6 of the suction port 8 of the oil pump 2. The support plate 28 of the relief valve 24 communicated to the discharge port 10 of the discharge port 12 through the communication port 22 is elastically upward in the upward direction by the raised oil pressure. After the support plate 28 is moved upward by a predetermined amount, the discharge port 10 and the bypass flow passage 14 of the discharge port 12 communicate with each other, and the discharge port ( Part of the oil introduced into 10 is to be returned through the suction port (6) of the suction port (8).

However, in the conventional oil pump 2 made as described above, when the oil pressure discharged and scattered by the engine becomes a predetermined pressure or more, the pressure in the oil pump 2 is increased to open the relief valve 24 and open the oil pressure. In the initial startup of the vehicle, since the viscosity of the oil is large, the pressure on the discharge port 10 side of the oil pump 2 is greatly increased, so that the oil pressure discharged to the engine is below a certain pressure. Since the relief valve 24 is opened to return the oil on the discharge port 10 side to the suction port 6 side, the oil pressure discharged to the engine falls below a certain pressure, and the amount of oil is significantly reduced. The end of the main movement of the lubrication is not made properly, there was a problem that the wear of the engine.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, to prevent the malfunction of the relief valve due to the oil viscosity at the initial startup of the vehicle to prevent the pressure and flow rate of the oil discharged to the engine by the oil pump It is an object of the present invention to provide a pressure regulating device for an automobile oil pump that maintains a constant, thereby lubricating the main moving parts of the engine uniformly.

Technical configuration of the present invention for achieving the above object is a communication port formed to communicate with the discharge port of the discharge port on one side of the housing of the oil pump; A bypass passage formed at one side of the housing spaced from the communication port so as to communicate with the suction port of the suction port; A relief valve connected to one side of the bypass passage and a communication port, the tip of which communicates with one side of the discharge port in contact with the engine; An elastic member inserted into the housing of the relief valve; And a plunger provided at one end of the elastic member to communicate with the communication port and the bypass passage while moving in the housing of the relief valve.

In addition, the plunger provided in the housing of the relief valve is formed at both ends of the upper projection and the lower projection is pressed into the housing of the relief valve, the lower projection is located between the communication port and the bypass passage before the movement of the plunger, After the movement is characterized in that the communication port and the bypass flow passage is located between the upper projection and the lower projection.

1 is a cross-sectional view showing a conventional automobile oil pump

Figure 2 is an exploded perspective view showing the main parts of the inner and outer gears and the housing of the conventional oil pump

3 is a sectional view showing an oil pump according to the present invention;

Figure 4 is a state diagram used in accordance with the present invention

Explanation of symbols on the main parts of the drawings

2: oil pump 4: housing

6: suction port 8: suction port

10: discharge port 12, 12a: discharge port

14: Bypass Euro 16: Inner Gear

18: Outer Gear 20: Sickle

22: communication port 24: relief valve

26: housing 28: support plate

30: elastic member 50: relief valve

52: housing 54: plunger

56: upper protrusion 58: lower protrusion

60: elastic member

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view showing an oil pump according to the present invention, Figure 4 is a state diagram used in accordance with the present invention.

As shown, the inner gear 16 and the outer gear 18 which are eccentric inside the outer gear 18 are rotated through the cycle 20 to suck oil into the inlet 8 to the outlet 12. In the oil pump 2 to be discharged, a communication port 22 communicating with the discharge port 10 of the discharge port 12 is formed at one side of the housing 4 of the oil pump 2, and the communication port ( One side of the housing 4 spaced apart from the 22 is formed with a bypass passage 14 communicating with the suction port 6 of the suction port 8.

In addition, one side of the housing 4 is provided with a relief valve 50, one side of the relief valve 50 is connected to the bypass passage 14 and the communication port 22 in communication with, The tip is mounted in communication with one side of the discharge port 12a in contact with the engine.

An elastic member 60 of a spring is inserted into the housing 52 of the relief valve 50, and a plunger 54 is provided at one end of the elastic member 60 in the housing 52 of the relief valve 50. It is provided to be movable up and down within the communication port 22 and the bypass passage 14 to communicate.

In addition, at both ends of the plunger 54 provided in the housing 52 of the relief valve 50, an upper projection 56 and a lower projection 58 press-fitted into the housing 52 of the relief valve 50 are provided. Is formed.

The upper protrusion 56 and the lower protrusion 58 of the plunger 54 have the lower protrusion 58 communicating with the communication port 22 of the relief valve 50 and the bypass passage 14 before the plunger 54 moves. The communication port 22 and the bypass flow passage 14 are interposed between the communication port 22 and the bypass passage 14 after the plunger 54 moves. The communication port 22 and the bypass passage 14 communicate with each other by being located between the lower protrusions 58.

When the crankshaft rotates at the initial start of the vehicle, the pressure regulating device of the vehicle oil pump according to the present invention made as described above rotates the inner gear 16 in the oil pump 2 housing 4, thereby engaging it. As the outer gear 18 rotates, the oil of the oil pan is pumped, and the oil pumped into the oil pump 2 is introduced into the suction port 6 of the suction port 8.

As described above, the oil flowing into the suction port 6 of the suction port 8 is introduced between the gears of the inner gear 16 and the outer gear 18 by the rotation of the inner gear 16 and the outer gear 18. As the gear 20 rotates with the gear 20, it is introduced into the discharge port 10 of the discharge port 12.

As described above, the oil introduced into the discharge port 10 of the discharge port 12 is discharged to the main moving part of the engine through the discharge port 12a in contact with the engine to lubricate the engine.

Thereafter, when the oil pressure discharged and scattered by the engine is greater than or equal to the predetermined pressure, the relief valve 50 connected to one side of the discharge port 12a of the oil pump 2 is opened, which increases the oil pressure discharged to the engine. As a result, the plunger 54 of the relief valve 50 moves to the lower end of the housing 52 of the relief valve 50 while compressing the elastic member 60, and the lower protrusion 58 of the plunger 54 moved as described above. When passing through the bypass passage 14 of the oil pump (2), the bypass passage 14 and the communication port 22, which is in communication with each side of the relief valve 50 by the lower projection (58), respectively. Are communicated with each other through the housing 52 of the relief valve 50.

Then, a part of the oil of the discharge port 10 discharged through the discharge port 12a of the oil pump 2 flows into the communication port 22 communicated with the discharge port 10, and the housing of the relief valve 50 The oil introduced into the 52 and introduced into the housing 52 of the relief valve 50 as described above flows into the bypass passage 14 connected to one side of the relief valve 50. The oil introduced into the 14 flows back into the suction port 6 and returns to the suction port 8 to reduce the discharge pressure and the flow rate of the oil pump 2.

On the other hand, at the initial startup of the vehicle, the viscosity of the oil is formed to be large so that the pressure on the discharge port 10 side of the oil pump 2 rises rapidly even though the oil pressure discharged to the engine is below a certain pressure.

However, at this time, the relief valve 50 is not operated as in the prior art, because the relief valve 50 is in communication with one side of the discharge port (12a) of the oil pump 2 in contact with the engine of the oil Since the operation is performed according to the discharge pressure, even if the oil pressure of the discharge port 10 in the oil pump 2 rises at the initial start of the vehicle, the oil pressure and the flow rate discharged to the engine can be kept constant at all times.

As described above, the pressure regulating device of the vehicle oil pump of the present invention always maintains a constant discharge pressure and flow rate of the oil discharged to the engine even if the pressure of the discharge port in the oil pump is increased by the oil viscosity at the initial start-up of the vehicle It is maintained to make it effective to improve the lubricity of the engine.

Claims (2)

An oil pump in which the inner gear 16 and the outer gear 18 eccentric inside the outer gear 18 are rotated via the sickle 20 to suck oil into the inlet 8 and discharge the oil into the outlet 12. In (2), A communication port 22 formed at one side of the housing 4 of the oil pump 2 to communicate with the discharge port 10 of the discharge port 12; A bypass passage 14 formed at one side of the housing 4 spaced apart from the communication port 22 so as to communicate with the suction port 6 of the suction port 8; A bypass valve 14 and a communication port 22 communicating with one side thereof, and a tip end of the relief valve 50 mounted to communicate with one side of the discharge port 12a in contact with the engine; An elastic member 60 inserted into the housing 52 of the relief valve 50; A plunger 54 provided at one end of the elastic member 60 so as to communicate with the communication port 22 and the bypass passage 14 while moving in the housing 52 of the relief valve 50. Pressure regulating device of the vehicle oil pump, characterized in that made. The method of claim 1, The plunger 54 provided in the housing 52 of the relief valve 50 has upper and lower protrusions 56 and lower protrusions 58 pressed into the housing 52 of the relief valve 50 at both ends thereof. Before the movement of the plunger 54, the lower projection 58 is located between the communication port 22 and the bypass passage 14, and after the movement, the communication port 22 and the bypass passage 14 are the upper projection. Pressure control device of the vehicle oil pump, characterized in that the communication is located between the 56 and the lower projection (58).