KR20090126661A - In-line fuel pump for elevation lubrication with thrust bearing - Google Patents

Abstract

PURPOSE: An in-line fuel pump is provided to prevent wear and damage due to friction between a primary axis of a motor and a bearing by keeping the rotating primary axis from shaking from side to side. CONSTITUTION: An in-line fuel pump comprises a housing(10) with an inlet(11) and an outlet(12), a pumping unit(20) which supplies LPG fuel into the housing, a motor unit(30), and a thrust bearing. The motor unit comprises a primary axis(32) which is connected to the pumping unit and has an integrated ball on tip thereof, a secondary axis(36) which is formed on the opposite side to the primary axis and supported on the outlet of the housing, and an electric motor(31) which is connected between the primary axis and the secondary axis. The thrust bearing with a support hole is inserted in the primary axis and fixed to the inner surface of the housing.

Description

In-line Fuel Pump for elevation lubrication with Thrust bearing}

The present invention relates to an in-line type LLP fuel pump equipped with a thrust bearing for improving lubricity. More specifically, the bushing is installed on the first and second shafts of the motor so as to be fixed inside the housing, and the motor shakes due to the bushing. In order to prevent the ball from being completely integrally coupled to the end of the first shaft and inserting the ball into the end of the second shaft, the motor is fixed. It is possible to prevent durability degradation due to wear and the like to increase the life of the fuel pump, thereby reducing the cost of repair and replacement, it is possible to increase the pressure of the LPG fuel introduced into the housing on the first shaft of the motor unit Since a bearing having a plurality of grooves is installed at one end thereof so as to catch left and right shakes generated during rotation of the first shaft. AJU is directed to an in-line type LLP fuel pump provided with a thrust bearing for preventing the first shaft from contacting the bearing, thereby improving lubrication without causing wear and breakage.

In general, a pump refers to a device that transfers fluid by inputting energy. A turbo pump that supplies kinetic energy to the fluid by rotation of a vane and a space that periodically changes the space to inhale and discharge the fluid are transported. It is divided into volumetric pumps and special pumps by other means.

Among the pumps described above, the volumetric pump is used as a fuel pump of an automobile because of its low flow rate but very high hydraulic pressure.

In recent years, liquid phase LPG injection (LPLI) has been used for the use of environmentally friendly fuel, such as automotive fuel. there was. However, in the case of the built-in pump, there is a problem that must be replaced at the same time as the fuel tank when a failure occurs, and in recent years, an external fuel pump for installing a pump in a fuel line has been proposed.

However, the external fuel pump pumps the LLP fuel by driving the shaft formed in the motor therein and delivers it to the engine. At this time, the bearing is connected to the inside of the fuel pump so that the shaft rotates in place without shaking, the bearing is continuously rubbed with the inner surface of the fuel pump by the rotation of the shaft is abrasion in the long-term use, the rotational force of the motor is reduced to reduce the fuel pump The problem of low efficiency occurs.

In addition, the maintenance cost of repair and replacement due to the wear of the bearing is increased to reduce the productivity and demand of the external fuel pump.

The present invention has been made to solve the above problems,

Bushings are installed on the first and second shafts of the motor so as to be fixed inside the housing, and the balls are integrally and completely coupled to the ends of the first shaft and the balls are inserted into the ends of the second shaft to prevent the motor from shaking due to the bushings. By fixing the motor, it is possible to prevent deterioration in durability due to wear of the bushing part, the pumping part and the housing even when the LLP fuel is introduced when the motor is driven, thereby increasing the life of the fuel pump, and thus repair and replacement It is an object of the present invention to provide an in-line ellipse fuel pump equipped with a thrust bearing for improving lubricity and reducing cost.

In addition, the present invention is provided with a bearing formed with a plurality of grooves on one end surface so as to increase the pressure of the LLP fuel introduced into the housing on the first shaft of the motor portion, the left, which occurs during the rotation of the first shaft, It is another object to provide an in-line type LLP fuel pump equipped with a thrust bearing for preventing lubricity and preventing the first shaft from contacting the bearing, thereby improving lubricity without causing wear and breakage.

In order to achieve the above object, the present invention provides a fuel pump for compressing and pumping LPG (Liquefied Petroleum Gas, LPG) fuel,

A housing having inlets and outlets formed at both sides for introducing / exhausting the LLP fuel;

A pumping part formed at an inlet side of the housing to introduce the LLP fuel into the housing;

A first shaft connected to the pumping part and integrally formed with a ball so that the pumping part is driven, a second shaft formed on an opposite side of the first axis and supported at an outlet side of the housing, A motor unit which is installed between the two shafts and is formed inside the housing, the electric motor being configured to generate rotational force by electricity;

The thrust bearing for improving the lubrication is installed, characterized in that the support hole is formed to be fitted to the first shaft corresponding to the electric motor, the thrust bearing is fixed to the inner surface of the housing; It relates to an in-line type LLP fuel pump.

As described above, the in-line type LLP fuel pump installed with the thrust bearing for improving the lubricity of the present invention is provided with bushings on the first and second shafts of the motor to be fixed inside the housing, and the motor shakes due to the bushing. In order to prevent the ball from being completely integrally coupled to the end of the first shaft and inserting the ball into the end of the second shaft, the motor is fixed. It is possible to prevent durability degradation due to wear, etc., which increases the life of the fuel pump, thereby reducing the cost of repair and replacement.

In addition, the present invention is provided with a bearing formed with a plurality of grooves on one end surface so as to increase the pressure of the LLP fuel introduced into the housing on the first shaft of the motor portion, the left, which occurs during the rotation of the first shaft, By holding the right shake to prevent the first shaft from contacting the bearing, there is an effect that the wear and damage does not occur.

The present invention has the following features to achieve the above object.

The present invention is a fuel pump for compressing and pumping the LPG (Liquefied Petroleum Gas, LPG) fuel,

A housing having inlets and outlets formed at both sides for introducing / exhausting the LLP fuel;

A pumping part formed at an inlet side of the housing to introduce the LLP fuel into the housing;

A first shaft connected to the pumping part and integrally formed with a ball so that the pumping part is driven, a second shaft formed on an opposite side of the first axis and supported at an outlet side of the housing, A motor unit which is installed between the two shafts and is formed inside the housing, the electric motor being configured to generate rotational force by electricity;

The support hole is formed to be fitted to the first shaft to correspond to the electric motor, the thrust bearing is fixed to the inner surface of the housing; characterized in that it comprises a.

The present invention having such a feature will be more clearly described through the preferred embodiment accordingly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a cross-sectional view showing an in-line type LLP fuel pump installed with a thrust bearing for improving lubricity according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view showing a portion A of FIG.

As shown in FIG. 1 and FIG. 2, the LLP fuel pump 100 of the present invention includes a housing 10, a pumping unit 20, a motor unit 30, and a thrust bearing 50.

The housing 10 has an inlet 11 and an outlet 12 formed at both sides to inject / discharge the LLP fuel, and a fuel tank (not shown) at the inlet 11 of the housing 10. The outlet 12 of the housing 10 is connected to a fuel injector (not shown) of the engine.

That is, the fuel pump 100 according to the embodiment of the present invention is an external fuel pump installed in a fuel line connecting the fuel tank and the fuel injector.

Here, a space is formed in the inlet 11 side of the housing 10 so that the pumping unit 20 is installed, and another space is formed in the outlet 12 side so that the motor unit 30 can be installed. do. At this time, the guide film 13 is formed to divide the internal space of the housing 10 into the pumping unit 20 side and the motor unit 30 side, the LP film through the pumping unit 20 in the guide film 13 A fuel passage 14 is formed to transfer fuel to the motor unit 30, and the fuel passage 14 has a constant angle so that the LLP fuel is smoothly transferred to the motor unit 30 by the rotation of the pumping unit 20. Is formed.

The pumping unit 20 is installed in a space formed at the inlet 11 side of the housing 10 so that the LLP fuel is introduced into the housing 10 through the fuel passage 14 of the guide membrane 13. The roller vane 21 is connected to the first shaft 32 of the portion 30 and rotated so that the LPI fuel flows through the inlet 11 of the housing 10, and the outer circumferential surface of the roller vane 21. A plurality of rollers circumferentially arranged in a circumferential direction to inhale and discharge the LPI fuel by the rotation of the roller vanes, and installed on both sides of the roller vane 21 so as to cover the flow paths of the LPI fuel to be sucked and discharged. It is composed of a plate 22 is formed with a transfer hole 24 on one end to provide a.

In this case, a roller vane 21 or a gear rotor method formed in the pumping unit 20 may also be used, and the motor unit 30 inside the pumping unit 20 outside the roller vane 21. When driven by the first shaft 32 of the plate 22 is further formed to prevent the shaking to drive smoothly.

Here, the roller vanes 21 are driven by being connected to the first shaft 32 of the motor unit 30. The first shaft 32 is coupled to the roller vanes 21 so that the ends thereof are connected to the plate 22. In this case, the ball is completely integrally coupled to the end of the first shaft 32 so that the end of the first shaft is formed into a rounded arc, and the rounded arc of the first shaft 32 is formed. Due to this, when the first shaft 32 rotates, friction with the plate 22 may be reduced, and wear and the like may be prevented. In this case, a groove (not shown) is formed at one end of the plate 22 in contact with the end of the first shaft 32 such that the first shaft 32 is not spaced apart from the left and right sides.

The motor unit 30 is connected to the pumping unit 20 so that the pumping unit 20 is driven so that the first end 32 is formed integrally with the ball, and formed on the opposite side of the first shaft 32 And an electric motor connected between the second shaft 36 supported on the outlet 12 side of the housing 10 and the first shaft 32 and the second shaft 36 to generate rotational force by electricity. It consists of 31 is installed in the housing (10).

Here, of course, any actuator may be used in addition to the electric motor 31. In addition, the electric motor 31 includes a permanent magnet 34 and a rotor 33 disposed in a magnetic field region generated by the permanent magnet 34. Since the electric motor 31 is obvious to those skilled in the art, the detailed description thereof will be omitted.

In addition, the first and second shafts 32 and 36 are formed to protrude to both sides of the electric motor 31 by a predetermined interval, and the first shaft 32 to fix the electric motor 31 inside the housing 10. The guide membrane 13 is installed through the second shaft 36, and one side of the second shaft 36 is inserted into the housing 10 of the outlet 12 at a predetermined interval to fix the electric motor 31. At this time, the bushing 40 is fitted to the outer circumferential surfaces of the first and second shafts 32 and 36 in contact with the housing 10, so that the first and second shafts 32 and 36 are rotated, thereby reducing the friction to the minimum. Make it smooth. At this time, the bushing 40 is obvious to those skilled in the art to which the present invention pertains, and thus a detailed description thereof will be omitted.

Here, the bushing 40 is installed on the outer circumferential surface of the housing 10 and the first and second shafts 32 and 36, but is not fixed, so that the bushing 40 is rotated when the first and second shafts 32 and 36 are rotated. By being spaced apart at regular intervals from the housing 10, no wear occurs between the bushing 40 and the housing 10. Accordingly, the durability of the fuel pump 100 is improved to increase the life of the fuel pump 100.

At this time, however, when the bushing 40 is spaced apart, the electric motor 31 and the first and second shafts 32 and 36 of the motor unit 30 may not be fixed while being shaken. The ball 35 is inserted into the end portion (part of contact with the outlet 10 side housing 10) of the 36, the ball 35 is inserted into the housing when the second shaft 36 is rotated The ball 35 is not fixed to minimize friction with the 10. A coupling groove 36a is formed at the end of the second shaft 36 so that the ball 35 can be inserted therein.

As such, the ball 35 is inserted into the end of the second shaft 36 to prevent the electric motor 31 and the second shaft 36 of the motor unit 30 from shaking, and also the motor shaft. And wear of the housing 10 can be reduced.

In addition, an insertion groove 15 is formed in the inner surface of the outlet 12 side housing 10 in accordance with the ball 35 inserted into the end of the second shaft 36 so that the ball 35 is not separated. Prevent it.

Here, the ball 35 is inserted to be detachably attached to the end of the second shaft 36 or attached in various ways, such as being fixed integrally with the second shaft 36.

In addition, the ball 35 may selectively use any one of silicon carbide (SIC), alumina (Al₂O₃), and zirconia (ZrO₂) material identical to the first and second axes 32 and 36 of the motor unit 30. have.

3 is a cross-sectional view showing a bearing housing and a thrust bearing according to an embodiment of the present invention, Figure 4 is a plan view showing a thrust bearing according to an embodiment of the present invention, Figure 5 is an embodiment of the present invention Figure 6 is a perspective view showing a thrust bearing, Figure 6 is a perspective view showing a bearing housing according to an embodiment of the present invention, Figure 7 is a graph showing a pressure rise curve of the thrust bearing according to an embodiment of the present invention.

3 to 5 and 7, the thrust bearing 50 is formed with a support hole 51 to be fitted to the first shaft 32 to correspond to the electric motor 31, the housing ( The bearing housing 60 is further formed to be fixed to the inner surface of the 10). At this time, the thrust bearing 50 is coupled to the bearing housing 60 to be fixed to the inner surface of the housing 10.

Here, the thrust bearing 50 is formed in a cross-section "ㅗ" shape is protruding one side is inserted into the bearing housing 60, referring to Figure 1, the thrust bearing 50 corresponding to the electric motor 31. On one side of the fan-shaped groove 52 is formed a plurality of radial. At this time, the groove 52 is an ellipji fuel introduced into the housing 10 flows into the groove 52 portion, the pressure of the ellipji fuel is increased to increase the pressure of the ellipji fuel toward the support hole 51 of the thrust bearing 50 To push. As a result, high-pressure LLP fuel is injected into the first shaft 32 inserted into the support hole 51 of the thrust bearing 50 to control the shaking of the first shaft 32 and accordingly the first shaft 32. The thrust bearing 50 may be prevented from contacting to prevent wear and breakage in advance.

Here, the groove 52 is formed with a flow path groove 53 which communicates with the groove 52 so that the LLP fuel introduced into the housing 10 flows into the groove 52 and is discharged into the support hole 51. The flow path groove 53 is formed in a plurality of radially from one end surface of the thrust bearing 50, the flow path groove 53 is formed to communicate from the outer peripheral surface of the thrust bearing 50 to the inner peripheral surface of the support hole 51 In this case, the groove 52 is also in communication with the intermediate portion.

In addition, the groove 52 is formed on the side opposite to the rotation direction of the first shaft 32 with respect to the center line C in the drawing, and according to the rotation of the first shaft 32. It is effective to increase the pressure of LLP fuel introduced in 52).

As shown in Figure 3 or 6, the bearing housing 60 is formed in a cross-section "ㅗ" shape and the protruding one side and the thrust bearing 50 is in contact, the bearing housing so that the thrust bearing 50 is coupled A coupling hole 61 is formed at the center of the 60, and a plurality of fixing holes 62 are formed on the outer circumferential surface of the protrusion to fix the thrust bearing 50 to the coupling hole 61 by the coupling member.

In addition, the bearing housing 60 is coupled to the thrust bearing 50, a plurality of fixing holes 62 are formed in the circumferential direction of one end surface to be fixed to the inner surface of the housing 10 by a fixing member. .

1 is a cross-sectional view showing an in-line type elbow fuel pump installed with a thrust bearing for improving lubricity according to an embodiment of the present invention,

FIG. 2 is an enlarged cross-sectional view illustrating part A of FIG. 1;

3 is a cross-sectional view illustrating a bearing housing and a thrust bearing according to an embodiment of the present invention;

4 is a plan view showing a thrust bearing according to an embodiment of the present invention,

5 is a perspective view showing a thrust bearing according to an embodiment of the present invention,

Figure 6 is a perspective view showing a bearing housing according to an embodiment of the present invention,

Figure 7 is a graph showing the pressure rise curve of the thrust bearing according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

10 housing 11 inlet

12: outlet 13: guide film

14: fuel passage 15: insertion groove

20: pumping part 21: roller vane

22: plate 23: roller

30: motor unit 31: electric motor

32: 1st axis 33: rotor

34: permanent magnet 35: ball

36: 2nd axis 40: bushing

50: thrust bearing 51: support hole

52: home 53: euro home

60: bearing housing 61: coupling hole

62: fixing hole 100: fuel pump

Claims (10)

In the fuel pump for compressing and pumping the LPG (Liquefied Petroleum Gas, LPG) fuel, A housing (10) having inlets (11) and outlets (12) formed at both sides for inlet / outlet of the LLP fuel; A pumping part (20) formed at an inlet (11) side of the housing (10) to introduce the LLP fuel into the housing (10); A first shaft 32 having an end portion integrally formed with a ball so as to be connected to the pumping unit 20 to drive the pumping unit 20, and formed on an opposite side of the first shaft 32 to form the housing 10. It consists of a second shaft 36 which is supported on the outlet 12 side of the electric motor 31 is connected between the first shaft 32 and the second shaft 36 to generate a rotational force by electricity A motor unit 30 installed inside the housing 10; A thrust bearing having a support hole 51 formed to be fitted to the first shaft 32 to correspond to the electric motor 31, and fixed to an inner surface of the housing 10; In-line type LLP fuel pump is installed with a thrust bearing for improving lubricity, characterized in that comprising a. The method of claim 1, Lubricity of the thrust bearing 50 is characterized in that the fan-shaped grooves 52 are formed radially in plural, so that the pressure of the Elpji fuel introduced into the housing 10 increases in the grooves 52. In-line elbow fuel pump with thrust bearing for improvement. The method of claim 2, The groove 52 is formed in the direction opposite to the rotation of the first shaft 32 with respect to the center line C, and is inserted into the support hole 51 by the pressure of the high LLP fuel in the groove 52. An in-line type elbow fuel pump provided with a thrust bearing for improving lubricity, characterized by keeping (32) from contacting the inner circumferential surface of the thrust bearing (50). The method of claim 3, wherein In each of the grooves 52, a flow path groove 53 communicating with the grooves 52 radially from one end surface of the thrust bearing 50 so that the LPI fuel introduced into the housing 10 flows into the grooves 52. In-line ellipse fuel pump is installed with a thrust bearing for improving lubricity, characterized in that formed. The method of claim 1, The thrust bearing 50 is an in-line type LLP fuel pump installed with a thrust bearing for improving lubricity, characterized in that the bearing housing 60 is further formed to be fixed to the inner surface of the housing (10). The method of claim 5, The bearing housing 60 has a coupling hole 61 formed at the center portion thereof so that the thrust bearing 50 is coupled to fix the thrust bearing 50 to the coupling hole 61 by a coupling member, and the housing 10. Inline type LLP fuel pump is installed in the thrust bearing for improving lubricity, characterized in that a plurality of fixing holes 62 are formed in the circumferential direction of one end so as to be fixed to the inner surface of the. The method of claim 1, wherein the pumping unit 20, A roller vane 21 connected to the first shaft 32 of the motor unit 30 and rotated so that the LPI fuel is introduced into the housing through the inlet 11 of the housing 10; A plurality of rollers 23 disposed in the circumferential direction on the outer circumferential surface of the roller vanes 21 to suck and discharge the LLP fuel by the rotation of the roller vanes; A plate 22 installed on both sides of the roller vane 21 and having a transfer hole 24 formed at one end thereof to provide a flow path of the suctioned and discharged LPG fuel; In-line type LLP fuel pump is installed with a thrust bearing for improving lubricity, characterized in that comprising a. The method of claim 1, When the first and second shafts 32 and 36 rotate in the housing 10, the bushings 40 are respectively installed at portions in contact with the housing 10 so as to reduce friction with the housing 10. In-line elbow fuel pump with thrust bearing for improved lubricity. The method of claim 1, The second shaft 36 has a ball 35 at an end contacting the outlet side housing so that the second shaft 36 rotates smoothly while the electric motor 31 is fixed in the housing 10 and prevents shaking. In-line ellipse fuel pump is installed with a thrust bearing for improving lubricity, characterized in that the insertion. The method of claim 9, An insertion groove 15 is formed on an inner surface of the housing 10 at the outlet 12 side in accordance with the ball 35 inserted into the end of the second shaft 36 to prevent the ball 35 from being separated. In-line ellipse fuel pump is installed with a thrust bearing for improving lubricity.

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