KR20170020586A

KR20170020586A - Oil Pump

Info

Publication number: KR20170020586A
Application number: KR1020150113866A
Authority: KR
Inventors: 문선주
Original assignee: 명화공업주식회사
Priority date: 2015-08-12
Filing date: 2015-08-12
Publication date: 2017-02-23

Abstract

The present invention relates to an oil pump including a body which is provided with a suction line for sucking oil from an oil pan, and a supply line which supplies the oil flowing in from the suction line, to each friction portion of an engine, an outer rotor which is installed to rotate in the body, and an inner rotor which is installed to be eccentric with respect to the outer rotor and is rotated in association with the rotation of a driving shaft of an engine. The oil pump comprises: a first oil chamber which is formed to come in contact with the outer rotor and inner rotor in the body, and is provided with an oil inlet through which oil flows; a second oil chamber which is formed to come in contact with the outer rotor and the inner rotor in the body, and is provided with an oil outlet through which oil compressed by the inner rotor is discharged; and a rotor cover which is disposed comes in contact with the sides of the outer rotor and the inner rotor in the body, and allows a part of the oil compressed in compression spaces of the outer rotor and the inner rotor to flow into the second oil chamber. According to the present invention, the flow path for supplying a part of the oil compressed in the oil compression space to the discharge side of oil is formed to prevent noise and cavitation in the pump when the oil pump is operated.

Description

Oil Pump {Oil Pump}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump, and more particularly, to an oil pump that prevents noise and cavitation from occurring in a pump during operation of the pump.

The oil pump is configured to pressurize the oil using mechanical energy of the prime mover, such as an electric motor, an internal combustion engine or a steam turbine, and then move it to each part of the engine.

Depending on the structure of the oil pump, gear type, bean type and piston type are available. The oil pump has a constant delivery pump in which the discharge amount of the pump is always constant according to the load variation and a variable delivery pump in which the discharge amount is changed in accordance with the variation of the load.

The variable displacement type oil pump in which the amount of discharge varies in accordance with the variation of load as a vane type includes a main body, an inner rotor rotating in accordance with rotation of the drive shaft, an outer rotor eccentrically installed with the inner rotor, and an outer rotor elastically supporting the outer rotor, A support spring that keeps the inner rotor in a position eccentrically positioned with respect to each other, and a plurality of vanes that rotate while contacting with the inner circumferential surface of the outer rotor to transmit the oil to the outside.

Here, the plurality of vanes are configured to be radially slidably coupled to the outer circumferential surface of the inner rotor, so that the distance between the inner rotor and the center axis of the inner rotor can be varied when the inner rotor rotates.

When the oil pump rotates at a high speed, if the oil supply does not sufficiently supply to correspond to the rotational speeds of the outer rotor and the inner rotor, the inner part of the oil pump can not be filled with oil so that compression and expansion of the oil can proceed There is a problem in that cavitation which does not exist is generated.

Prior art to the present invention is exemplified by Patent No. 10-175375.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide an oil pump which circulates a part of the oil compressed and discharged in the oil compression space to the compression space of the oil to thereby generate noise and cavitation And an object of the present invention is to provide an oil pump capable of preventing oil spillage.

In order to accomplish the above object, the present invention provides an oil pump comprising: a body having a suction line for suctioning oil from an oil pan, and a supply line for supplying the oil introduced from the suction line to each friction portion of the engine; An inner rotor rotatably installed in the inner rotor and an inner rotor disposed eccentrically with respect to the outer rotor and rotated in association with rotation of a drive shaft of the engine, A first oil chamber formed adjacent to the inner rotor and having an oil inlet through which the oil flows; A second oil chamber formed in the body so as to be in contact with the outer rotor and the inner rotor and having an oil outlet through which the oil compressed by the outer rotor and the inner rotor is discharged; And a portion of the oil introduced into the second oil chamber after being compressed in the compression space of the outer rotor and the inner rotor is supplied to the compression space The oil pump includes a rotor cover for allowing the oil pump to rotate.

Wherein the rotor cover includes a cover body having a ring shape having a diameter corresponding to the diameter of the outer rotor and having an oil inflow hole for discharging oil compressed by the outer rotor and the inner rotor, A chamber groove formed to connect the outer rotor and the oil compression space of the inner rotor to the second oil chamber, and a second oil chamber formed on the rear surface of the cover body so that one end thereof is connected to the oil inflow hole and the other end thereof is connected to the second oil chamber An oil groove formed on the cover body and a plurality of fixing protrusions protruding from the outer circumferential side of the cover body.

According to the present invention as described above, a flow path for circulating a part of the oil compressed and discharged in the oil compression space to the compression space of the oil is formed, thereby preventing noise and cavitation from occurring in the pump when the oil pump operates .

1 is a view showing an example of the configuration of an oil pump according to an embodiment of the present invention.
Fig. 2 is a view showing an example of the arrangement state of the rotor cover used in the present invention. Fig.
3 is a front view showing an example of the configuration of a rotor cover used in the present invention.
4 is a rear view showing an example of the configuration of a rotor cover used in the present invention.

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

FIG. 1 is a view showing an example of the configuration of an oil pump according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of the arrangement state of a rotor cover used in the present invention.

1 and 2, an oil pump 100 according to an embodiment of the present invention includes a body 110, a first oil chamber 101, a second oil chamber 102, an outer rotor 120, An inner rotor 130 and a rotor cover 140.

The body 110 is formed with a suction line (not shown) for sucking oil from the oil pan and a supply line (not shown) for supplying the oil introduced from the suction line to each friction portion of the engine.

Inside the body 110, an outer rotor 120 and an inner rotor 130 to be described later can be accommodated.

The outer rotor 120 is formed in a substantially ring shape. The outer rotor 120 is installed in the inner space of the body 110.

On the inner circumferential surface of the outer rotor 120, a plurality of first gears protrude.

The inner rotor 130 is circular and eccentrically disposed inside the outer rotor 120 by a predetermined amount and a plurality of second gears that mate with the first gear are projected on the outer circumferential surface of the inner rotor 130.

The oil is compressed in a space between the inner circumferential surface of the outer rotor 120 and the outer circumferential surface of the inner rotor 130.

The outer rotor 120 and the inner rotor 130 rotate counterclockwise in the drawing.

The first oil chamber 101 is formed at a predetermined position on the inner side of the body 110 so that one side of the outer rotor 120 contacts the inside of the body 110.

The oil in the first oil chamber 101 is compressed by the outer rotor 120 and the inner rotor 130. The oil in the first oil chamber 101 is supplied through the suction line outside the oil pump 100.

The second oil chamber 102 is formed at a predetermined position on the inner side of the body 110 so that one side of the outer rotor 120 contacts the inside of the body 110. The second oil chamber 102 receives the oil compressed by the outer rotor 120 and the inner rotor 130.

In the figure, the first oil chamber 101 and the second oil chamber 102 are formed at positions opposite to each other, but their positions can be changed according to the needs of the user.

The rotor cover 140 is disposed at a position where the outer rotor 120 is disposed in the body 110 so that the outer rotor 120 and one surface of the inner rotor 130 are disposed in contact with each other, (130).

The rotor cover 140 includes a cover body 142, a chamber groove 144, an oil groove 148, and a fixing protrusion 149.

The cover main body 142 is in the form of a ring having a diameter corresponding to the diameter of the outer rotor 120 and is disposed at an arrangement position of the outer rotor 120. However, the cover body 142 may be partially removed in order to facilitate interconnection with external components. An oil inflow hole 143 is formed on the cover main body 142 to allow the outer rotor 120 and a part of the oil discharged from the second oil chamber 102 after being compressed by the inner rotor 130 to flow into the second oil chamber 102.

The cover main body 142 supports the outer rotor 120 and the inner rotor 130 during the rotation operation of the outer rotor 120.

The chamber groove 144 is formed with a predetermined depth and area at a predetermined position of the cover body 142. The chamber groove 144 is of a "C" shape, and the open portion is disposed to face the second oil chamber 102. The chamber groove 144 connects the oil compression space of the outer rotor 120 and the inner rotor 130 to the second oil chamber 102 and is connected to the outer rotor 120 and the inner rotor 130, To be supplied to the second oil chamber 102.

An oil groove 148 is formed on the back surface of the cover body 142. The oil groove 148 is connected to the oil inflow hole 143 at one end and connected to the second oil chamber 102 at the other end. The oil groove 148 allows a part of the compressed oil in the second oil chamber 102 to be supplied to the oil inflow hole 143. The oil groove 148 may be formed to have a predetermined depth and width. The curvature of the oil groove 148 may correspond to the curvature of the outer periphery of the outer rotor 120.

A plurality of fixing protrusions 149 are projected around the outer periphery of the cover body 142. The degree of protrusion and size of the fixing protrusion 149 can be changed according to the user's need. The fixing protrusion 149 can be fixed to the fixing protrusion 149 inside the body 110 more easily by fixing the end of the fixing protrusion 149 to the inside of the body 110 so that the rotor cover 140 can be fixed, The cover body 142 may be prevented from being detached from its original position during operation of the outer rotor 120 and the inner rotor 130 after the corresponding fixing groove is formed.

Hereinafter, the operation of the present invention will be described.

When the engine (not shown) operates, the oil pump 100 receives rotation of the engine and rotates. At this time, the oil in the body 110 of the oil pump 100 is supplied to the respective portions of the engine through the supply line, and then bypassed to enter the first oil chamber 101 inside the body 110 .

The outer rotor 120 and the inner rotor 130 are rotated by the continuous operation of the engine so that the oil in the first oil chamber 101 is compressed and then the oil in the chamber groove 144 And is supplied to the outside through the second oil chamber 102.

At this time, a part of the compressed oil supplied to the second oil chamber 102 is supplied to the compression space of the outer rotor 120 and the inner rotor 130 through the oil groove 148 and the oil inflow hole 143.

Accordingly, since a part of the oil compressed and supplied as described above is circulated to the compression space, cavitation that prevents the compression and expansion of the oil from progressing can be prevented even if the number of revolutions of the engine increases.

The present invention can prevent noise and cavitation from occurring in the pump during operation of the oil pump by forming a passage for supplying a part of the oil compressed in the oil compression space to the oil discharge side.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Oil pump 101, 102: First oil chamber, Second oil chamber
110: body 120: outer rotor
130: Inner rotor 140: Rotor cover

Claims

A main body having a suction line for sucking oil from the oil pan and a supply line for supplying the oil introduced from the suction line to each friction portion of the engine, an outer rotor rotatably installed inside the main body, An oil pump which is disposed eccentrically with respect to an outer rotor and in which an inner rotor that rotates in conjunction with rotation of a drive shaft of the engine is disposed inside,
A first oil chamber formed in the body so as to be in contact with the outer rotor and the inner rotor and having an oil inlet through which the oil flows;
A second oil chamber formed in the body so as to be in contact with the outer rotor and the inner rotor and having an oil outlet through which the oil compressed by the outer rotor and the inner rotor is discharged; And
And a rotor cover disposed on the inside of the body so that one side of the outer rotor and the inner rotor are disposed in contact with each other and a portion of the oil compressed in the compression spaces of the outer rotor and the inner rotor flows into the second oil chamber. .

The method according to claim 1,
The rotor cover
A cover body having a ring shape having a diameter corresponding to the diameter of the outer rotor and having an oil inflow hole for discharging the oil compressed by the outer rotor and the inner rotor,
A chamber groove formed on the cover body so as to connect the oil compression space of the outer rotor and the inner rotor to the second oil chamber,
An oil groove having one end connected to the oil inflow hole and the other end connected to the second oil chamber on the back surface of the cover body;
And a plurality of fixing protrusions protruding from the outer peripheral side of the cover body.