KR20030048167A - Oil pump - Google Patents

Abstract

PURPOSE: An oil pump is provided to reduce loss of power by supplying an appropriate amount of oil to the engine in accordance with the engine RPM. CONSTITUTION: An oil pump comprises an operating space(34) formed in a gear portion(33) of an internal gear(31); a high speed operating piece(42) accommodated in the operating space, which has an inclined inner end; a mid speed operating piece(40) having an inclined inner end which is smaller than the inclined inner end of the high speed operating piece, wherein the mid speed operating piece is accommodated in the operating space side by side to the high speed operating piece; an oil chamber(35) formed side by side to the operating space; the primary rod(50) having an inclined end such that the mid speed operating piece is pushed outward by the pressure of the oil caught at the oil chamber during the mid speed operation of engine; the secondary rod(55) protruded from the intermediate portion of the primary rod such that the high speed operating piece is pushed outward by the pressure of the oil caught at the oil chamber during the high speed operation of engine; and oil passages(21,36) formed at a crank shaft(20) and the internal gear so as to transfer the oil pressure to the oil chamber in proportion to the engine RPM.

Description

Oil pump {Oil pump}

The present invention relates to an oil pump, and more particularly to an oil pump to adjust the pumping amount of the oil pump in accordance with the operating area by the engine speed.

In general, the engine of the engine is injected with engine oil to reduce friction and promote smooth operation of the engine. The engine oil is divided into scattering, pumping and pumping scattering according to the injection method of the engine oil. A lot of pressure feeding is used.

The pressurized lubrication device is composed of an oil pan, an oil pump, an oil filter, an oil pressure regulator and an oil pressure display device, and pumps oil stored in the oil pan with an oil pump to generate pressure along a predetermined passage. By lubricating each part of the engine by lubrication, the proper amount of oil must be adequate for smooth lubrication, and the proper hydraulic pressure must be maintained so that the engine oil is supplied to the entire lubrication part of the engine.

Therefore, the pressure type lubrication device is equipped with a hydraulic regulator to properly adjust the pressure of the oil pumped by the oil pump, and a hydraulic gauge or a warning light is installed on the instrument panel so that the driver can easily recognize the proper pressure of the oil. have.

In addition, the conventional oil pump is mounted on the lower side of the cylinder block to supply oil by pumping oil from the oil pan in which the oil is stored, which is shown in FIGS. 7 and 8. 7 is a side cross-sectional view of a conventional oil pump, and FIG. 8 is a front view of the conventional oil pump.

As shown in the drawing, one side of the oil pump housing 11 of the oil pump 10 is formed with a shaft hole 12 to which one end of the crank shaft 20 of the engine is axially coupled, and one side of the oil pump is accommodated. The space 13 to be formed is formed. The internal gear 14 and the external gear 15 are accommodated in the space 13 formed in the oil pump housing 11, and the internal gear 14 is axially coupled to the crank shaft 20.

In particular, since the internal gear 14 and the external gear 15 are formed to be eccentric with each other, a gap is formed between the outer circumference of the internal gear 14 and the inner circumference of the external gear 15. As the internal gear 14 and the external gear 15 rotate in engagement with each other, the oil flowing into the gap is pressurized and the amount of oil required by the engine is pumped through the flow path 16 formed in the oil pump housing 11. At this time, the oil pumping amount diagram of the oil pump 10 has a linear shape as shown in FIG. 9.

That is, the oil pump configured as described above is supplied with more oil than the amount of oil actually required in the engine because the amount of oil pumped from the oil pump is determined in proportion to the engine speed. Therefore, the excess oil pumped from the oil pump is returned to the oil pan, causing unnecessary power consumption, there is a problem that the noise due to the high rotation of the oil pump also increases.

Therefore, the present invention has been made to solve the above problems, and more specifically, an object of the present invention is to provide an oil pump to adjust the pumping amount of the oil pump according to the operating area by the rotational speed of the engine.

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

In an oil pump in which an internal gear is supported at one end of the crank shaft, and the external gear is coupled to the outer circumference of the internal gear,

An operating space formed in the gear portion of the internal gear;

A high speed operation piece accommodated inside the operation space, the inner end of which is inclined;

An intermediate end working piece which is formed to be inclined at an inner end like the high speed working piece, and is smaller than the high speed working piece, and is accommodated in the working space in parallel with the high speed working piece;

An oil chamber formed at one side of the operation space;

A primary rod having an inclined surface formed at one end such that the medium speed operation piece is pushed outward by the pressure of the oil applied to the oil chamber when the engine is operated at medium speed;

A secondary rod protruding from an intermediate portion of the primary rod such that the high speed working piece is pushed outward by the pressure of the oil applied to the oil chamber when the engine is rotated at high speed;

And an oil passage formed in the crank shaft and the internal gear so that oil pressure proportional to the rotational speed of the engine can be transmitted to the oil chamber.

1 is a block diagram of an oil pump according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 to 5 is an operation state diagram of the oil pump according to the present invention,

3 is a diagram when the engine is operated at a low speed.

4 is a diagram when the engine is driven at medium speed;

5 is a diagram when the engine is driven at a high speed.

6 is a graph showing a pumping amount diagram of an oil pump formed by the present invention.

7 to 8 are views for explaining the conventional technology.

9 is a pumping amount diagram of a conventional oil pump.

※ Explanation of codes for main parts of drawing

20: crankshaft 21: oil passage

30: oil pump 31: internal gear

32: shaft hole 33: gear unit

34: working space 35: oil chamber

36: oil passage 40: medium speed operation piece

42: high speed operation piece 50: primary rod

51: slope 53: first spring

55: secondary rod 56: second spring

Hereinafter, with reference to the accompanying drawings an embodiment according to the configuration and operation of the present invention will be described in detail.

1 is a configuration diagram of an oil pump according to the present invention, Figure 2 is a cross-sectional view taken along the line AA of Figure 1, Figures 3 to 5 show the operating state of the oil pump according to the present invention, Figure 3 4 is a case where the engine is operated at medium speed, FIG. 5 is a case where the engine is operated at high speed, and FIG. 6 shows a pumping amount diagram of the oil pump formed by the present invention.

Reference numerals shown in the drawings indicate the oil pump formed by the present invention. When the oil pump 30 is formed of the internal gear 31 and the external gear 39 as in the prior art, the internal gear 31 is It is inserted into one end of the crank shaft 20.

In the center of the internal gear 31 is formed a shaft hole 32 for fitting one end of the crank shaft 20, the gear portion 33, the operating space for accommodating the operation piece to be installed as shown in the drawing 34 ) Is formed. In addition, an oil chamber 35 is formed at one side of the working space 34 to provide a pressure of oil. Oil passages 21 and 36 are formed in the crankshaft 20 and the internal gear 31 so that oil can be supplied to the oil chamber 35.

And the operating piece accommodated in the operating space 34 is composed of a medium speed operation piece 40 and a high speed operation piece 42, the medium speed operation piece 40 and the high speed operation piece 42 The inner end is inclined at the same slope. In particular, the high speed operation piece 42 is preferably formed longer than the medium speed operation piece 40, the medium speed operation piece 40 is accommodated in the oil chamber 35 side, the high speed operation piece 42 is housed side by side on the side of the medium speed operation piece.

The primary rod having an inclined surface 51 at one end thereof is advanced by the pressure of the oil applied to the oil chamber 35 when the engine is operated at a medium speed, so that the high speed working piece 42 is pushed outward. 50 is formed. Since the primary rod 50 is accommodated in the oil chamber 35 and its inner side is connected by the first spring 53, the primary rod is reduced when the oil pressure in the oil chamber 35 is reduced. 50 is formed so that it may be returned.

In particular, the primary rod 50 is formed with a groove 52 so that one end of the secondary rod 55 can be accommodated therein. Accordingly, one end of the secondary rod 55 is received in the groove 52 of the primary rod 50 while being elastically supported by the second spring 56.

Referring to the operation of the present invention configured as described above are as follows.

When the engine is operated, an oil pump 30 formed at one end of the crankshaft 20 is operated. The oil pump 30 has an engine speed determined in proportion to the engine speed.

By the way, in the case of the oil pump 30 according to the present invention, although the rotation speed of the oil pump is rotated at the same speed as the crank shaft 20, the pumping amount of the oil is changed step by step according to the operating region of the engine.

That is, when the engine rotates at a low speed, since the pressure of the oil transmitted to the oil chamber 35 through the oil passages 21 and 36 is not large, as shown in FIG. Dragon working piece 42 is in the original position. Therefore, compared with the prior art, the area of the gear part 33 that pumps oil is reduced, thereby reducing the amount of pumping oil.

In addition, when the rotation of the engine becomes a medium speed at a low speed, the pressure of oil scattered by the oil pump 30 also increases. Therefore, the pressure of the oil flowing into the cucumber chamber 35 through the oil passages 21 and 36 is also increased. When the pressure of the oil chamber 35 is increased in this way, the primary rod 50 is advanced by the pressure of the oil. When the primary rod 50 is advanced, the intermediate speed operation piece 40 is pushed out while sliding to the outside by the inclined surface 51 formed at one side thereof. As soon as the medium speed operation piece 40 is pushed out, the pumping area for pumping oil is also increased, thereby increasing the pumping amount of oil. In this way, the medium speed operation piece 40 is pumped in a state in which the medium speed operation piece 40 is completely pushed by the oil pressure.

Finally, when the engine rotates at a high speed, the pressure of oil scattered by the oil pump 30 is also increased to a high pressure. Therefore, the pressure of the oil flowing into the oil chamber 35 through the oil passages 21 and 36 also becomes high pressure. When the pressure in the oil chamber 35 becomes high in this manner, the secondary rod 55 is advanced by the pressure. When the secondary rod 55 is advanced as described above, the end of the secondary rod 55 is pushed to the outside by pushing the inner end of the high speed operation piece 42. In other words, the pumping area for pumping oil increases as the high speed operation piece 40 is pushed out, thereby increasing the pumping amount of oil.

As described above, the oil pumping amount of the oil pump is improved step by step according to the rotational area (low speed, medium speed, high speed) of the engine.

On the contrary, when the engine changes from high speed to medium speed and medium speed to low speed, the engine is operated in the reverse of the above steps.

The oil pump configured as described above does not have a straight line in the oil pumping amount, so that an appropriate oil amount according to the engine rotation area is supplied to the engine, thereby reducing unnecessary power loss. The advantage is that it is supplied in an optimal state.

Claims (3)

In an oil pump in which an internal gear is supported at one end of the crank shaft, and the external gear is coupled to the outer circumference of the internal gear, An operating space 34 formed in the gear part 33 of the internal gear 31; A high speed operation piece 42 which is accommodated in the operation space 34 and whose inner end is inclined; The inner end is formed to be inclined like the high speed operation piece 42, but is formed smaller than the high speed operation piece 42, and is accommodated in the operation space 34 in parallel with the high speed operation piece 42. Working piece 40; An oil chamber 35 formed at one side of the operation space 34; A primary rod 50 formed to be inclined at one end such that the medium speed operation piece 40 is pushed outward by the pressure of the oil applied to the oil chamber 35 when the engine is operated at medium speed; 2 which protrudes from the middle of the primary rod 50 so that the high speed operating piece 42 is pushed outward by the pressure of the oil applied to the oil chamber 35 when the engine is rotated at high speed. A car rod 55; And oil passages 21 and 36 formed in the crank shaft 20 and the internal gear 31 so that oil pressure in proportion to the rotational speed of the engine can be transmitted to the oil chamber 35. Oil pump. The method of claim 1, The first spring 54 is connected to the inner surface of the primary rod 50, so that when the oil pressure is reduced in the oil chamber 35, the primary rod 50 is formed in its original position. An oil pump characterized by the above-mentioned. The method of claim 1, The secondary rod (55) is an oil pump, characterized in that the elastic support is supported by the second spring (56) accommodated inside the primary rod (50).