CN112567111A

CN112567111A - Oil pump

Info

Publication number: CN112567111A
Application number: CN201980052936.XA
Authority: CN
Inventors: 文善柱
Original assignee: Myunghwa Ind Co Ltd
Current assignee: Meiwa Kogyo Co Ltd; Myunghwa Ind Co Ltd
Priority date: 2018-06-15
Filing date: 2019-06-07
Publication date: 2021-03-26
Also published as: US20210254618A1; WO2019240437A1; EP3808946A4; KR102108355B1; EP3808946A1; KR20190141845A

Abstract

The present invention provides an oil pump that sucks and discharges oil, the oil pump including: a housing portion; a stator portion that is housed in the housing portion and includes an outer ring that forms a variable chamber between the housing portion and the stator portion, into which oil is introduced, and a main pressing end that protrudes outward from an outer peripheral surface of the outer ring; a rotor portion housed in the outer ring and configured to suck and discharge oil by rotation; a spring portion including a main spring pressing the stator portion and configured to movably support the outer ring in the housing portion; a guide portion that includes a first guide piece that is mounted on the outer peripheral surface of the outer ring, slidably mounted in a first guide groove formed in an inner wall of the housing portion, and guides the movement of the outer ring as the outer ring is pressed by the oil flowing into the variable chamber, and that guides the movement of the outer ring; and a sealing portion interposed between the housing portion and the stator portion, thereby preventing the oil introduced into the variable chamber from leaking into another space between the housing portion and the stator portion.

Description

Oil pump

Technical Field

The present invention relates to an oil pump, and more particularly, to an oil pump that sucks and discharges oil.

Background

In general, an oil pump refers to a device that draws oil, compresses the oil, and discharges the oil to the outside by rotation of a rotor portion to circulate the oil to various engines such as an engine. The average internal temperature of the internal combustion engine is about 800 degrees celsius, and the maximum temperature is about 2,000 degrees celsius as an instantaneous value in the explosion stroke. In an internal combustion engine, friction is continuously generated between the inner wall of a cylinder and the sliding surface of a piston, the bearing of a crankshaft, the bearing of a camshaft, and the like. Therefore, it is considered that the oil pump cools the engine by circulating oil through the engine, and reduces friction generated between various components constituting the engine.

The oil pump is of two types, vane type and gear type. The vane type oil pump comprises an outer ring, an inner rotor arranged in the outer ring and vanes arranged on the peripheral surface of the inner rotor. In addition, the vane type oil pump operates such that oil is sucked and discharged by the vanes as the inner rotor rotates. The gear type oil pump includes an outer ring, an outer rotor and an inner rotor, the outer rotor and the inner rotor being mounted inside the outer ring, and the outer rotor having gear teeth formed on an inner circumferential surface thereof, and the inner rotor having gear teeth formed on an outer circumferential surface thereof. In addition, the gear type oil pump rotates as the inner rotor to mesh with the outer rotor so that oil sucked between the inner rotor and the outer rotor is pressed and discharged to the outside.

On the other hand, the oil pump is characterized in that the pressure of oil discharged from the oil pump continuously increases as the number of revolutions of the inner rotor increases. In the case where the pressure discharged from the oil pump is excessively high, each engine may suffer mechanical damage, and the pressure is a factor that reduces the overall efficiency of the system. Therefore, in order to prevent this, korean patent No. 10-1491175 discloses a variable oil pump capable of selectively reducing a space between an outer ring and an inner rotor.

In the conventional variable oil pump as described above, it is characterized in that the outer ring is hinge-connected to the inside of the housing portion, and the outer ring is moved with the pressing of the oil flowing between the outer ring and the housing portion, thereby reducing the oil compression space between the outer ring and the inner rotor.

In this case, the above-described conventional variable oil pump has a structure in which the outer ring moves along a certain trajectory inside the housing portion based on the hinge connection portion of the inner wall of the housing portion. Such a conventional variable oil pump has the following problems: the amount of oil supplied to the engine by the oil pump cannot be effectively and stably adjusted in response to a change in the amount of oil required by the engine in accordance with a change in the speed of the engine.

Disclosure of Invention

Technical problem

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide an oil pump in which the amount of oil supplied to an engine is effectively and stably adjusted in response to a change in the amount of oil required by the engine.

Solution to the problem

The present invention provides an oil pump for sucking and discharging oil, comprising: a housing portion; a stator portion including an outer ring that is received inside the housing portion and forms a variable chamber into which oil flows between the housing portion and the stator portion, and a main pressing end that is formed to protrude outward from an outer circumferential surface of the outer ring; a rotor portion that is housed inside the outer ring and sucks and discharges oil by rotating; a spring portion including a main spring pressing the stator portion and movably supporting the outer ring inside the housing portion; a guide portion that includes a first guide piece that is mounted on the outer peripheral surface of the outer ring, slidably mounted in a first guide groove formed in an inner wall of the housing portion, and guides the movement of the outer ring as the outer ring is pressed by the oil flowing into the variable chamber, and that guides the movement of the outer ring; and a seal portion interposed between the housing portion and the stator portion, the seal portion preventing the oil flowing into the variable chamber from leaking into another space between the housing portion and the stator portion.

The first guide groove may be formed on the opposite side of the variable chamber based on the outer ring, and the first guide may be mounted on the outer circumferential surface of the outer ring on the opposite side of the variable chamber. The spring portion may further include a first auxiliary spring, one end of which is in contact with the outer circumferential surface of the outer ring on the side opposite to the main spring, and the other end of which is in contact with the inner wall of the housing portion.

The stator portion may further include a first auxiliary pressing end formed to protrude from the outer circumferential surface of the outer ring to surround the first auxiliary spring. The sealing portion may include a first seal member interposed between the inner wall of the outer ring and the first assist spring.

The spring part may further include a second auxiliary spring, one end of which is in contact with the main pressing end and the other end of which is in contact with the inner wall of the housing part. The stator portion may further include a second auxiliary pressing end formed to protrude from the main pressing end to surround the second auxiliary spring.

The main spring may be arranged such that one end is in contact with the main pressing end and the other end is in contact with the inner wall of the housing portion, and the oil flowing into the variable chamber may press the stator portion toward a side opposite to a direction in which the outer ring is pressed.

The housing portion may be formed with a second guide groove on the inner wall on the opposite side to the main spring based on the main pressing end. The guide portion may further include a second guide member mounted on the outer circumferential surface of the outer ring and slidably mounted in the second guide groove.

The first guide groove may be formed in a direction away from the main spring at a position adjacent to the main spring, and may be formed in a direction opposite to a direction of a force applied to the main pressing end by the main spring. The second guide groove may be formed to face the main pressing end side from the inner wall of the housing portion in which the variable chamber is formed.

The housing portion may be formed with a second guide groove on the inner wall on the first auxiliary pressing end side. The guide portion may further include a second guide member mounted on the outer circumferential surface of the outer ring and slidably mounted in the second guide groove.

The stator portion may further include a third auxiliary pressing end protruding outward from a portion of the outer circumferential surface of the outer ring between the first guide and the main pressing end. The main spring may be arranged such that one end is in contact with the third auxiliary pressing end and the other end is in contact with a portion of the inner wall of the housing portion on the main pressing end side to pressurize the stator portion.

The housing portion may be formed with a second guide groove on the inner wall of a side adjacent to the variable chamber. The guide portion may further include a second guide member mounted on the outer circumferential surface of the outer ring and slidably mounted in the second guide groove. The main spring may be disposed such that one end is in contact with the main pressing end and the other end is in contact with the inner wall portion of the housing portion at the second guide groove side to pressurize the stator portion.

Advantageous effects

With the oil pump according to the invention, there are provided: a guide portion including first and second guides at different positions for guiding movement of the outer ring; and a spring portion including first and second auxiliary springs at different positions for movably supporting the outer ring, thereby enabling the outer ring to move along various trajectories inside the housing portion.

Therefore, with the oil pump according to the present invention, it is possible to efficiently and stably adjust the amount of oil supplied to the engine in response to a change in the amount of oil required for the engine, according to a change in the speed of the engine.

Drawings

Fig. 1 is a diagram showing a state before oil is introduced into a variable chamber of an oil pump according to a first embodiment of the present invention.

Fig. 2 is a diagram showing a state after oil is introduced into a variable chamber of an oil pump according to a first embodiment of the present invention.

Fig. 3 is a diagram showing an oil pump according to a second embodiment of the present invention.

Fig. 4 is a diagram showing an oil pump according to a third embodiment of the present invention.

Fig. 5 is a diagram showing an oil pump according to a fourth embodiment of the present invention.

Detailed Description

The invention is described with reference to the embodiments shown in the drawings, which are intended to be illustrative only and by which various modifications and equivalent other embodiments are possible, as will be understood by those skilled in the art. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

Referring to fig. 1 and 2, an oil pump 100 according to an embodiment of the present invention includes a housing portion 110, a stator portion 120, a rotor portion 130, a spring portion 140, a guide portion 150, and a sealing portion 160.

The housing portion 110 has a suction port and a discharge port through which oil is sucked and discharged, and accommodates the stator portion 120, the rotor portion 130, the spring portion 140, the guide portion 150, and the seal portion 160 therein. Further, a variable chamber 110a into which some oil detours (bypass) discharged to the outside through the discharge port of the housing portion 110 are introduced is formed between the housing portion 110 and the stator portion 120.

The stator portion 120 includes an outer ring 121, a main pressing end 122, a first auxiliary pressing end 123, and a second auxiliary pressing end 124. Outer ring 121 is housed inside housing part 110, and variable chamber 110a is formed between outer ring 121 and housing part 110. The main pressing end 122 is formed to protrude radially outward from the outer circumferential surface of the outer ring 121.

The first auxiliary pressing end 123 is formed to protrude from the outer circumferential surface of the outer ring 121 corresponding to the side opposite to the main pressing end 122. In addition, the second auxiliary pressing end 124 is formed to protrude toward the outside based on the radial direction of the outer ring 121 from the end of the main pressing end 122. Here, the first auxiliary pressing ends 123 may be formed as a pair arranged spaced apart from each other in the circumferential direction of the outer ring 121. In addition, the second auxiliary pressing ends 124 may be formed as a pair arranged to be spaced apart from each other.

The rotor portion 130 is accommodated inside the outer ring 121 to suck and discharge oil by rotating, and includes an outer rotor 131, an inner rotor 132, and a rotating shaft 133. The outer rotor 131 is fixedly connected to the outer ring 121 such that the outer circumferential surface is in contact with the inner circumferential surface of the outer ring 121. The inner rotor 132 is installed inside the outer rotor 131, and a pressing chamber 131a that sucks and presses oil is formed between the inner rotor 132 and the outer rotor 131. In addition, the outer rotor 131 and the inner rotor 132 are installed such that gear teeth (gear teeth) formed on an inner circumferential surface of the outer rotor and an outer circumferential surface of the inner rotor are engaged with each other.

The rotation shaft 133 is rotatably fixed to the housing portion 110 and installed to penetrate through a central portion of the inner rotor 132, thereby being fixedly connected to the inner rotor 132. In addition, the rotating shaft 133 receives power from the engine and rotates together with the inner rotor 132.

The spring part 140 is provided such that the stator part 120 is movably supported inside the housing part 110, and includes a main spring 141, a first auxiliary spring 142, and a second auxiliary spring 143. The main spring 141 is disposed on the opposite side to the variable chamber 110a based on the main pressing end 122. In addition, the main spring 141 is arranged such that one end is in contact with the main pressing end 122 and the other end is in contact with the inner wall of the housing portion 110. Therefore, the main spring 141 presses the stator portion 120 toward the side opposite to the direction in which the oil flowing into the variable chamber 110a presses the stator portion 120.

A first auxiliary spring 142, one end of which is in contact with the outer circumferential surface of the outer ring 121 and the other end of which faces the inner wall of the housing part 110, is arranged between the pair of first auxiliary pressing ends 123. A second auxiliary spring 143, one end of which is in contact with the end of the main pressing end 122 and the other end of which faces the inner wall of the housing part 110, is disposed between the pair of second auxiliary pressing ends 124.

On the other hand, the housing portion 110 has a first guide groove 111 formed in an inner wall of the stator portion 120 on the side opposite to the variable chamber 110 a. Further, the housing portion 110 is formed with a second guide groove 112 on the inner wall on the side opposite to the main spring 141 based on the main pressing end 122.

The guide part 150 is provided to guide the movement of the stator part 120, and includes a first guide 151 and a second guide 152. The first guide 151 is fixedly installed on an outer circumferential surface of the outer ring 121 on the opposite side to the variable chamber 110 a. In addition, the first guide 151 is slidably inserted into the first guide groove 111. Accordingly, as the outer ring 121 is pressed by the oil flowing into the variable chamber 110a, the first guide 151 guides the movement of the stator portion 120.

The second guide 152 is fixedly mounted on the outer circumferential surface of the outer ring 121 on the variable chamber 110a side, that is, on the outer circumferential surface of the outer ring 121 on the side where the main spring 141 is not disposed, based on the main pressing end 122. In addition, the second guide 152 is slidably inserted into the second guide groove 112. Accordingly, the second guide 152 guides the movement of the stator part 120 together with the first guide 151.

With the above-described oil pump 100 according to the present invention, the stator portion 120 may be disposed inside the housing portion 110 while maintaining structural stability. That is, the pressure applied upward to the stator portion 120 by the main spring 141 may be supported by the pressure applied to the stator portion 120 by the oil flowing into the second guide 152 and the variable chamber 110a inserted into the second guide groove 112. In addition, the pressing force applied to the stator part 120 by the first auxiliary spring 142 may be supported by the pressing force applied to the stator part 120 by the first guide 151 and the second auxiliary spring 143 inserted into the first guide groove 111. Therefore, the oil pump 100 according to the embodiment of the present invention may maintain the structural stable state of the stator portion 120 inside the housing portion 110.

In addition, the oil pump 100 according to the present invention is designed in the following structure: the force is applied to the stator part 120 in a state where the first and second

auxiliary springs

142 and 143 disposed at different positions are not fixed to the inner wall of the housing part 110, and the stator part 120 is supported in a state where the first and

second guide members

151 and 152 disposed at different positions are in sliding contact with the first and

second guide grooves

111 and 112. Accordingly, as the stator portion 120 is pressed by the oil flowing into the variable chamber 110a, the stator portion 120 may move along various trajectories inside the housing portion 110. Therefore, with the oil pump 100 according to the present invention, the amount of oil supplied to the engine can be effectively and stably adjusted in response to a change in the amount of oil required by the engine according to a change in the speed of the engine.

On the other hand, the first guide groove 111 is formed in a direction away from the main spring 141 at a position adjacent to the main spring 141, and may be formed in a direction opposite to a direction of a force applied to the main pressing end 122 by the main spring 141. That is, as shown in fig. 1 and 2, the first guide groove 111 may be formed in a diagonal direction toward the lower left at a position adjacent to the main spring 141.

The second guide groove 112 may be formed on an inner wall of the housing part 110 in which the variable chamber 110a is formed, facing the main pressing end 122 side. That is, as shown in fig. 1 and 2, the second guide groove 112 may be formed along a diagonal direction toward the lower right on the inner wall of the housing part 110 in which the variable chamber 110a is formed.

In the case where the first and

second guide grooves

111 and 112 are formed to have such a structure, the first and

second guide members

151 and 152 and the stator portion 120 in which the first and

second guide members

151 and 152 are fixedly installed may be smoothly guided downward along the first and

second guide grooves

111 and 112.

However, this is only one of several embodiments of the present invention, and it is considered that the first guide groove 111 and the second guide groove 112 may be formed in various shapes according to the type of movement of the stator portion 120 desired by the implementer.

The sealing portion 160 is interposed between the housing portion 110 and the stator portion 120, and prevents oil that has flowed into the variable chamber 110a from leaking into a space other than the variable chamber 110a, of a space between the housing portion 110 and the stator portion 120. To this end, the sealing part 160 includes a first sealing member 161 and a second sealing member 162.

The first sealing member 161 is interposed between the inner wall of the housing part 110 and the other end of the first auxiliary spring 142. The second sealing member 162 is interposed between the inner wall of the housing portion 110 and the other end of the second auxiliary spring 143. As described above, since the first and

second seals

161 and 162 are respectively provided at both sides of the variable chamber 110a, the oil flowing into the variable chamber 110a can be prevented from leaking into other spaces.

Hereinafter, the oil pump 100 according to the second to fourth embodiments of the present invention will be described with reference to fig. 3 to 5. In this case, the oil pump 100 according to the second to fourth embodiments of the present invention will be described with emphasis on only the portions different from the oil pump 100 according to the first embodiment.

Referring to fig. 3, in the oil pump 100 according to the second embodiment of the present invention, the housing part 110 is formed with a second guide groove 112 on an inner wall of the first auxiliary pressing end 123 side, and the guide part 150 may further include a second guide 152 mounted on an outer circumferential surface of the outer ring 121 and slidably mounted in the second guide groove 112.

With the second guide groove 112 and the second guide 152 arranged in this structure, the force transmitted to the main pressing end 122 by the main spring 141 is not directly transmitted to the second guide 152, so that the second guide 152 can be protected. Further, in this case, the main spring 141 presses the stator portion 120 in a direction opposite to a direction in which the oil flowing into the variable chamber 110a presses the outer ring 121.

Referring to fig. 4, in the oil pump 100 according to the third embodiment of the present invention, the stator portion 120 may further include a third auxiliary pressing end 125 protruding outward from a portion of the outer circumferential surface of the outer ring 121 between the first guide 151 and the main pressing end 122. In addition, the main spring 141 is arranged such that one end is in contact with the third auxiliary pressing end 125, and the other end is in contact with a portion of the inner wall of the housing portion 110 on the main pressing end 122 side.

With the main spring 141 arranged in this structure, referring to fig. 4, when the oil flowing into the variable chamber 110a applies a force to the stator portion 120 in a counterclockwise direction, the main spring 141 may apply a force to the stator portion 120 in a clockwise direction corresponding to the opposite direction. Therefore, the oil pump 100 according to the present invention can more flexibly adjust the amount of oil discharged according to the oil flowing into the variable chamber 110 a.

Referring to fig. 5, in the oil pump 100 according to the fourth embodiment of the present invention, the main spring 141 is arranged such that one end is in contact with the main pressing end 122 and the other end is in contact with a portion of the inner wall of the housing portion 110 on the second guide groove 112 side. Therefore, the main spring 141 presses the main pressing end 122 in a direction away from the second guide groove 112.

Since the oil pump 100 according to the present invention is designed to have various structures as described above, the stator portion 120 may move along various trajectories inside the housing portion 110 as the stator portion 120 is pressed by the oil flowing into the variable chamber 110 a. Therefore, with the oil pump 100 according to the present invention, the amount of oil supplied to the engine can be effectively and stably adjusted in response to a change in the amount of oil required by the engine according to a change in the speed of the engine.

Claims

1. An oil pump that pumps and discharges oil, comprising:

a housing portion;

a stator portion including an outer ring that is received inside the housing portion and forms a variable chamber into which oil flows between the housing portion and the stator portion, and a main pressing end that is formed to protrude outward from an outer circumferential surface of the outer ring;

a rotor portion that is housed inside the outer ring and sucks and discharges oil by rotating;

a spring portion including a main spring pressing the stator portion and movably supporting the outer ring inside the housing portion;

a guide portion that includes a first guide piece that is mounted on the outer peripheral surface of the outer ring, slidably mounted in a first guide groove formed in an inner wall of the housing portion, and guides the movement of the outer ring as the outer ring is pressed by the oil flowing into the variable chamber, and that guides the movement of the outer ring; and

and a sealing portion interposed between the housing portion and the stator portion, the sealing portion preventing the oil flowing into the variable chamber from leaking into another space between the housing portion and the stator portion.

2. The oil pump as set forth in claim 1,

wherein the first guide groove is formed on the opposite side to the variable chamber based on the outer ring, and the first guide is mounted on the outer peripheral surface of the outer ring on the opposite side to the variable chamber, and

wherein the spring portion further includes a first auxiliary spring, one end of which is in contact with the outer peripheral surface of the outer ring on the side opposite to the main spring, and the other end of which is in contact with the inner wall of the housing portion.

3. The oil pump as set forth in claim 2,

wherein the stator portion further includes a first auxiliary pressing end formed to protrude from the outer circumferential surface of the outer ring to surround the first auxiliary spring, an

Wherein the seal portion includes a first seal member interposed between the inner wall of the outer ring and the first assist spring.

4. The oil pump as set forth in claim 2,

wherein the spring portion further includes a second auxiliary spring, one end of which is in contact with the main pressing end and the other end of which is in contact with the inner wall of the housing portion, an

Wherein the stator part further includes a second auxiliary pressing end formed to protrude from the main pressing end to surround the second auxiliary spring.

5. The oil pump as set forth in claim 2,

wherein the main spring is arranged such that one end is in contact with the main pressing end and the other end is in contact with the inner wall of the housing portion, and the oil flowing into the variable chamber presses the stator portion toward a side opposite to a direction in which the outer ring is pressed.

6. The oil pump as set forth in claim 5,

wherein the housing portion is formed with a second guide groove on the inner wall on the side opposite to the main spring based on the main pressing end, and

wherein the guide portion further includes a second guide member mounted on the outer peripheral surface of the outer ring and slidably mounted in the second guide groove.

7. The oil pump as set forth in claim 6,

wherein the first guide groove is formed in a direction away from the main spring at a position adjacent to the main spring and in a direction opposite to a direction of a force applied to the main pressing end by the main spring, and

wherein the second guide groove is formed to face the main pressing end side from the inner wall of the housing portion in which the variable chamber is formed.

8. The oil pump as set forth in claim 5,

wherein the housing portion is formed with a second guide groove on the inner wall of the first auxiliary pressing end side, an

9. The oil pump as set forth in claim 1,

wherein the stator portion further includes a third auxiliary pressing end protruding outward from a portion of the outer circumferential surface of the outer ring between the first guide and the main pressing end, and

wherein the main spring is arranged such that one end is in contact with the third auxiliary pressing end and the other end is in contact with the inner wall portion of the housing portion on the main pressing end side to pressurize the stator portion.

10. The oil pump as set forth in claim 1,

wherein the housing portion is formed with a second guide groove on the inner wall of a side adjacent to the variable chamber,

wherein the guide portion further includes a second guide member mounted on the outer peripheral surface of the outer ring and slidably mounted in the second guide groove, and

wherein the main spring is arranged such that one end is in contact with the main pressing end and the other end is in contact with a portion of the inner wall of the housing portion on the second guide groove side to press the stator portion.