KR20150055477A - Testing apparatus of fuel injection pump - Google Patents

Abstract

The present invention relates to an apparatus for testing a fuel injection pump comprising: a drive unit to lift a plunger included in a fuel injection pump to be tested; a first sensor unit coupled to the fuel injection pump and measuring a gap between a barrel where the plunger is installed and the plunger; and a test unit deriving a shaft trajectory of the plunger from the gap obtained by the first sensor unit. According to the present invention, the present invention figures out the gap between the plunger and the barrel through the shaft trajectory of the plunger derived by the test unit to evaluate a lubricating property of the fuel injection pump so as to be capable of developing the fuel injection pump suitable for characteristics of usage.

Description

TESTING APPARATUS OF FUEL INJECTION PUMP [0001]

The present invention relates to a fuel injection pump test fixture for testing a fuel injection pump.

Generally, a fuel injection pump is installed in an engine for providing propulsion power to an automobile or a ship (hereinafter, referred to as "object") using diesel as fuel, compresses the fuel to a high pressure and sends it to an injector installed in the combustion chamber . Such a fuel injection device is constituted by a plunger and a barrel for substantially compressing and delivering the fuel. The injector compresses and sends the fuel by reciprocating within a barrel in which a plunger serving as a piston acts as a cylinder.

1 is a cross-sectional view illustrating a conventional fuel injection pump.

Referring to FIG. 1, a fuel injection pump 1 according to the prior art includes a plunger 10 for compressing or decompressing fuel and a barrel 20 to which the plunger 10 is coupled.

The plunger 10 is coupled to the barrel 20 so as to reciprocate upward and downward. The plunger 10 is reciprocally driven by the cam of the camshaft. A relief groove (not shown) communicating with the plunger chamber 21 is formed in the plunger 10 and a control lead (not shown) communicating with the release groove is formed.

A plunger chamber 21 and a discharge chamber 22 are formed in the barrel 20 and a spill port 23 communicating the plunger chamber 21 and the discharge chamber 22, Respectively. Accordingly, fuel starts to be compressed when the plunger 10 rises and its peripheral surface closes the spill port 23. When a predetermined pressure is reached, a delivery valve (not shown) on the plunger chamber 21, Not shown) is injected through the injector, the remaining fuel is transferred into the ship oil chamber 22 through the return pipe.

Here, the plunger 10 is designed so as to maintain a smooth repetitive up-and-down sliding movement, so that the surface of the plunger 10 can be processed with a high degree of roughness and the gap between the plunger 10 and the inner circumferential surface of the barrel 20 can be maintained constant. However, in the fuel injection pump 1 according to the related art, the movement locus of the plunger 10 is changed by a disturbance such as an external impact, so that the gap between the plunger 10 and the barrel 20 is changed. Accordingly, in the fuel injection pump 1 according to the related art, the thickness of the oil film formed between the plunger 10 and the barrel 20 is changed. Therefore, the performance of the fuel injection pump 1 may be deteriorated as the plunger 10 and the barrel 20 are frictioned with each other. Therefore, the plunger 10 and the barrel 20 may be deteriorated, Development of a device for grasping the gap between the barrels 20 is desperately required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a fuel injection pump testing apparatus for grasping a state of a gap between a plunger and a barrel.

In order to solve the above problems, the present invention can include the following configuration.

A fuel injection pump testing apparatus according to the present invention includes: a driving unit for lifting a plunger of a fuel injection pump to be tested; A first sensor unit coupled to the fuel injection pump and measuring a gap between the plunger and the plunger; And a test section for deriving an axis locus of the plunger from the gap acquired by the first sensor section.

According to the fuel injection pump testing apparatus according to the present invention, the first sensor section includes a plurality of first sensors spaced apart from each other on the fuel injection pump, and the first sensors detect that different parts of the plunger are separated from the barrel And measuring the spaced gaps.

The fuel injection pump testing apparatus according to the present invention includes a second sensor portion coupled to the fuel injection pump, wherein the first sensor portion is located at a first height from the plunger in the axial direction of the plunger, And the second sensor portion measures a gap in which a portion of the plunger located at a second height lower than the first height is spaced from the barrel in the axial direction of the plunger.

According to the fuel injection pump testing apparatus according to the present invention, the first sensor unit may include a plurality of first sensors for measuring the gaps in which different portions of the plunger located at the first height are spaced from the barrel as the plunger moves up and down, Wherein the second sensor portion includes a plurality of second sensors for measuring gaps in which different portions of the plunger located at the second height are spaced from the barrel as the plunger moves up and down, The sensors and the second sensors measure the gap spaced apart from each other along the circumferential direction of the plunger from the barrel.

According to the present invention, the following effects can be achieved.

The present invention can test the lubrication performance of the fuel injection pump according to the gap state between the plunger and the barrel through the axial locus of the plunger derived by the test part, and thus it is possible to provide a fuel injection pump suited to the characteristics of the place of use.

1 is a sectional view for explaining a fuel injection pump according to the prior art,
2 is a perspective view showing a fuel injection pump testing apparatus according to the present invention,
3 and 4 are sectional views for explaining the first sensor unit in the fuel injection pump testing apparatus according to the present invention,
5 and 6 are sectional views for explaining a second sensor unit in the fuel injection pump testing apparatus according to the present invention.

It should be noted that, in the specification of the present invention, the same reference numerals as in the drawings denote the same elements, but they are numbered as much as possible even if they are shown in different drawings.

Meanwhile, the meaning of the terms described in the present specification should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item, and the third item" means a combination of all items that can be presented from two or more of the first item, the second item, or the third item do.

Hereinafter, a fuel injection pump testing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view showing a fuel injection pump testing apparatus according to the present invention.

Referring to FIG. 2, the fuel injection pump testing apparatus 100 according to the present invention includes a driving unit 130 for reciprocating the plunger 110 of the fuel injection pump to be tested, A first sensor unit 140 for measuring a gap between the plunger 110 and the barrel 130 and a test unit 150 for deriving the axis trajectory of the plunger 110, .

The driving unit 130 allows the plunger 110 to reciprocate within the barrel 130. The first sensor unit 140 is coupled to the fuel injection pump and measures a gap between the plunger 110 and the barrel 130. The test unit 150 derives the axis trajectory of the plunger 110 from the gap acquired by the first sensor unit 140. [

Accordingly, the fuel injection pump testing apparatus 100 according to the present invention is configured such that the test section 150 derives the axis locus of the plunger 110 from the gap acquired by the first sensor section 140, It is implemented to test the lubrication characteristics of the injection pump. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention provides the fuel injection pump suited to the characteristics of use, thereby preventing friction and wear caused by the contact of the plunger 110 and the barrel 120 can do. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention can prevent the plunger 110 and the barrel 120 from being damaged, thereby contributing to enhancement of the durability of the engine.

Hereinafter, the driving unit 130, the first sensor unit 140, and the test unit 150 will be described in detail with reference to the accompanying drawings.

Prior to the description, the plunger 110 moves up and down inside the barrel 120 to pressurize fuel to be supplied to the engine. Accordingly, the plunger 120 may cause the fuel to flow into the plunger chamber (not shown), to be compressed and to be delivered to the delivery valve (not shown).

The barrel 120 has the plunger chamber formed therein. Accordingly, the barrel 120 provides a space in which the plunger 110 can reciprocate up and down. A fuel supply unit (not shown) is formed outside the barrel 120. In this case, the plunger 110 may cause the fuel supplied to the plunger chamber to be sent to the engine side through the fuel supply unit.

Referring to FIG. 2, the driving unit 130 provides a driving force for moving the plunger 110 upward and downward within the barrel 120. For example, the driving unit 130 may include a cam and a driving motor. In this case, as the cam rotates while being connected to the plunger 110, the plunger 110 can reciprocate. The driving motor provides a driving force for moving the plunger 110 up and down. In this case, the driving motor can rotate the cam so that the cam can reciprocate the plunger 110. [0064]

The first sensor unit 140 measures a gap between the plunger 110 and the barrel 120. The first sensor unit 140 may be coupled to the fuel injection pump to measure the gap between the plunger 110 and the barrel 120. For example, the first sensor unit 140 may measure a gap between the plunger 110 and the barrel 120 in a process of reciprocating the plunger 110 in the barrel 120. For example, the first sensor unit 140 may obtain a gap between the plunger 110 and the barrel 120 as an electrical signal at a point on the plunger 110. [ Here, the first sensor unit 140 may be connected to a converter (not shown) to convert the obtained electrical signal into a voltage signal and provide the voltage signal to the test unit 150.

The test unit 150 derives the axis trajectory of the plunger 110. In this case, the test unit 150 can derive the axis trajectory of the plunger 110 from the gap acquired by the first sensor unit 140. For example, the test part 150 can derive the trajectory of the axis of the plunger 110 from the voltage signal path of the gap between the plunger 110 and the barrel 120 acquired by the first sensor part 140 have. Here, the axis locus may be a trajectory parallel to the lifting direction of the plunger 110. Accordingly, in the fuel injection pump testing apparatus 100 according to the present invention, the test section 150 derives the trajectory centered on the axis of the plunger 110 through the voltage signal of the gap acquired by the first sensor section 140 The lubrication characteristics of the fuel injection pump can be tested. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention provides the fuel injection pump suitable for use according to the characteristics of the application, so that the plunger 110 and the barrel 120 are frictioned and abraded Can be prevented. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention can prevent the plunger 110 and the barrel 120 from being damaged, thereby contributing to enhancement of the durability of the engine.

 3 and 4 are sectional views for explaining the first sensor unit in the fuel injection pump testing apparatus according to the present invention.

Referring to FIGS. 3 and 4, the first sensor unit 140 includes a plurality of first sensors 141 and 142 that are spaced apart from each other on the fuel injection pump.

The first sensors 141 and 142 measure the gaps in which different portions of the plunger 110 are spaced apart from the barrel 120. For example, the first sensor 141 of any one of the first sensors 141, 142 may be positioned at a first position for measuring a gap spaced from the barrel 120 by a portion of the plunger 110 The fuel injection pump may be connected to one side of the fuel injection pump. In this case, the first sensor 142 of the first one of the first sensors 141 and 142 is positioned at a position perpendicular to the first sensor 141 positioned at the first position, And may be coupled to the other side of the fuel injection pump so as to be positioned at a second position for measuring a gap spaced from the barrel 120.

In this case, the test unit 150 can derive the axis trajectory of the plunger 110 from the gaps acquired by the first sensors 141 and 142. For example, the test part 150 may derive the trajectory of the axis of the plunger 110 from the voltage signal path of the gap between the plunger 110 and the barrel 120 obtained by the first sensors 141 and 142 can do. The axis trajectory of the plunger 110 derived from the gap obtained from the first sensors 141 and 142 by the test unit 150 is shown in the following graph.

[Figure 1]

Referring to FIG. 1, the X axis represents the rotation angle of the plunger 110, and the Y axis represents the output voltage value of the rotation angle of the plunger 110. 1 represents the first sensor 141 of any one of the first sensors 141 and 142 and the blue graph represents the first sensor 141 of the other one of the first sensors 141 and 142 Sensor 142. Fig.

Accordingly, the fuel injection pump testing apparatus 100 according to the present invention tests the lubrication characteristics of the fuel injection pump by deriving the axial center locus of the plunger 110 through the first sensors 141 and 142 can do. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention can obtain the axial center locus of the plunger 110 at one or more points of the plunger 110, It is possible to improve accuracy in deriving the axial center locus of the plunger 110 as compared with the case where the plunger 110 is derived. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention derives the axial center locus of the plunger 110 at the first position and the second position, It is possible to accurately grasp the lubrication characteristics of the fuel injection pump.

5 and 6 are sectional views for explaining a second sensor unit in the fuel injection pump testing apparatus according to the present invention.

Referring to FIGS. 5 and 6, the fuel injection pump testing apparatus 100 according to the present invention may include a second sensor unit 160 coupled to the fuel injection pump.

In this case, the first sensor unit 140 measures a gap where a portion of the plunger 110 positioned at the first height in the lifting direction of the plunger 110 is separated from the barrel 120. For this, the first sensor unit 140 may be coupled to the first height of the barrel 120.

The second sensor unit 160 measures a clearance between the plunger 110 and the barrel 120. For example, the second sensor unit 160 may include a portion of the plunger 110 located at a second height lower than the first height in the lifting direction of the plunger 110, . For this, the second sensor unit 160 may be coupled to the second height of the barrel 120. For example, the second sensor unit 160 acquires a gap between the plunger 110 and the barrel 120 measured at a second height of the plunger 110 as an electrical signal. Here, the second sensor unit 160 may be connected to the converter to convert the obtained electrical signal into a voltage signal and provide the voltage signal to the test unit 150.

In this case, the test unit 150 determines the overall shaft locus of the plunger 110 and the lubrication state of the fuel injection pump from the gaps obtained by the first sensor unit 140 and the second sensor unit 160 . For example, in the test unit 150, the entire axial trajectory of the plunger 100 and the axial trajectory of the plunger 100 from the voltage signal of the gap acquired by the first sensor unit 140 and the second sensor unit 160 The lubrication state can be derived. Accordingly, the fuel injection pump testing apparatus 9100 according to the present invention is configured such that the test unit 150 can measure the fuel injection amount of the plunger 200 through the voltage signal of the gap obtained by the first sensor unit 140 and the second sensor unit 160, The overall shaft trajectory of the fuel injection pump 110 and the lubrication state of the fuel injection pump can be tested to test the lubrication characteristics of the fuel injection pump. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention can improve the accuracy in the test process for providing the fuel injection pump suitable for use according to the characteristics of the use place. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention can detect the damage of the plunger 110 and the barrel 120 in real time as the fuel injection pump is applied to the place of use, Can contribute to improving the technology for testing performance and durability.

Referring to FIGS. 2 to 6, the second sensor unit 160 includes a plurality of second sensors 161 and 162 that are spaced apart from the fuel injection pump.

The second sensors 161 and 162 measure the spacing of the different portions of the plunger 110 from the barrel 120 at the second height. For example, the first sensor 141 of any one of the second sensors 161 and 162 may be positioned at a second position such that a portion of the plunger is in a third position for measuring a gap spaced from the barrel 120 To the fuel injection pump.

In this case, the second sensor 162 of the second sensor 161 may be disposed at a position perpendicular to the second sensor 161 located at the first position, And may be coupled to the other side of the fuel injection pump at the second height so as to be positioned at a fourth position for measuring a gap spaced from the barrel 120. Here, the third position may be between the first position and the second position at the second height. For example, the first sensors 141 and 142 and the second sensors 161 and 162 measure the gap spaced apart from the barrel 130 along the circumferential direction of the plunger 110 can do. Here, the first sensors 141 and 142 can measure the movement locus of the plunger 110 on the same plane at the first height. In addition, the second sensors 161 and 162 can measure movement traces of the plunger 110 on the same plane at the second height. The axis trajectory locus of the plunger 110 derived from the gap information acquired by the test unit 150 from the second sensors 161 and 162 is shown in the following graph.

[Figure 2]

2, the X axis represents the rotation angle of the plunger 110, and the Y axis represents the output voltage value of the rotation angle of the plunger 110. As shown in FIG. The red graph of FIG. 2 represents any one of the second sensors 161 and 162 and the blue graph represents the second one of the second sensors 161 and 162 Sensor 162. Fig.

In this case, the test unit 150 can derive the axis trajectory of the plunger 110 from the gaps obtained by the first sensors 141 and 142 and the second sensors 161 and 162. For example, the test unit 150 may measure the voltage of the gap between the plunger 110 and the barrel 120 obtained by the first sensors 141 and 142 and the second sensors 161 and 162 The entire axial locus of the plunger 110 can be derived. The overall axis trajectory of the plunger 110 derived from the test unit 150 is shown in the following graph.

[Figure 3]

FIG. 3 shows an axial center locus of the plunger 110 according to heights derived from gaps acquired by the first sensors 141 and 142 and the second sensors 161 and 162.

Accordingly, the fuel injection pump testing apparatus 100 according to the present invention may be configured such that the test unit 150 detects the fuel injection pump from the gap obtained by the first sensors 141 and 142 and the second sensors 161 and 162, The thickness of the oil film formed at various points of the plunger 110 can be grasped by grasping the entire axial center locus of the plunger 110. [ Therefore, the fuel injection pump testing apparatus 100 according to the present invention can further improve accuracy in the lubrication characteristic testing process of the fuel injection pump according to the thickness of the oil film. Accordingly, the fuel injection pump testing apparatus 100 according to the present invention can contribute to improving the lubrication characteristics of the fuel injection pump by accurately grasping in real time the influence of various design factors on the lubrication characteristics in the fuel injection pump, It can further contribute to improving the performance of the engine.

The fuel injection pump can be used at an appropriate place according to the lubrication characteristics of the fuel injection pump, so that the performance of the engine can be further improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of.

100: fuel injection pump test apparatus 110: plunger
120: barrel 130:
140: first sensor unit 150:
160: second sensor unit

Claims (4)

A driving unit for lifting the plunger of the fuel injection pump to be tested;
A first sensor unit coupled to the fuel injection pump and measuring a gap between the plunger and the plunger; And
And a test section for deriving an axis locus of the plunger from the gap acquired by the first sensor section. The method according to claim 1,
Wherein the first sensor unit includes a plurality of first sensors spaced apart from each other on the fuel injection pump,
Wherein the first sensors measure the spacing of the different portions of the plunger away from the barrel. The method according to claim 1,
And a second sensor unit coupled to the fuel injection pump,
Wherein the first sensor unit measures a gap in which a portion of the plunger located at a first height in the axial direction of the plunger is spaced from the barrel,
Wherein the second sensor portion measures a gap in which a portion of the plunger located at a second height lower than the first height is spaced from the barrel in the axial direction of the plunger. The method of claim 3,
Wherein the first sensor unit includes a plurality of first sensors for measuring a gap spaced apart from the barrel by different portions of the plunger positioned at the first height as the plunger moves up and down,
Wherein the second sensor portion includes a plurality of second sensors for measuring a gap spaced apart from the barrel by different portions of the plunger positioned at the second height as the plunger moves up and down,
Wherein the first sensors and the second sensors measure the gap spaced apart from each other along the circumferential direction of the plunger from the barrel.

Images