WO2019240437A1

WO2019240437A1 - Oil pump

Info

Publication number: WO2019240437A1
Application number: PCT/KR2019/006881
Authority: WO
Inventors: 문선주
Original assignee: 명화공업주식회사
Priority date: 2018-06-15
Filing date: 2019-06-07
Publication date: 2019-12-19
Also published as: US20210254618A1; KR102108355B1; KR20190141845A; CN112567111A; EP3808946A1; EP3808946A4

Abstract

The present invention provides an oil pump for sucking and discharging oil, the oil pump comprising: a housing part; a stator part accommodated in the housing part and including an outer ring forming a variable chamber in which oil is introduced between the housing part and the stator part, and a main pressing end protruding outward from an outer peripheral surface of the outer ring; a rotor part accommodated in the outer ring and configured to suck and discharge oil through rotation; a spring part including a main spring pressurizing the stator part, and configured to allow the outer ring to be movably supported in the housing part; a guiding part installed on the outer peripheral surface of the outer ring, slidably installed in a first guiding groove formed on an inner wall of the housing part, and configured to guide the movement of the outer ring, the guiding part including a first guiding member for guiding the movement of the outer ring as the outer ring is pressed by the oil introduced into the variable chamber; and a sealing part interposed between the housing part and the stator part to prevent the oil introduced into the variable chamber from leaking into another space between the housing part and the stator part.

Description

Oil pump

The present invention relates to an oil pump, and more particularly, to an oil pump for sucking and discharging oil.

In general, an oil pump refers to a device that circulates various engines such as an engine by injecting and compressing oil through the rotation of the rotor and then discharging it to the outside. Internal combustion engines have an average internal temperature of about 800 degrees Celsius and a maximum temperature of about 2,000 degrees Celsius at the time of an explosive stroke. In addition, the internal combustion engine continuously generates friction in the cylinder inner wall and the sliding surface of the piston, the crankshaft bearing, the camshaft bearing, and the like. Therefore, the oil pump can be said to reduce the friction generated between the various components constituting the engine while cooling the engine by circulating the oil through such an engine.

There are two types of oil pumps: vane type and gear type. The vane type oil pump includes an outer ring, an inner rotor provided inside the outer ring, and a vane provided on an outer circumferential surface of the inner rotor. And the vane type oil pump operates so that oil is sucked and discharged by the vane as the inner rotor rotates. The gear-type oil pump includes an outer ring and an outer rotor and an inner rotor, which are provided inside the outer ring and have tooth teeth formed on inner and outer circumferential surfaces, respectively. And the gear type oil pump, as the inner rotor rotates to engage with the teeth of the outer rotor, the oil sucked between the inner rotor and the outer rotor is pressurized to be discharged to the outside.

On the other hand, the oil pump is characterized in that the pressure of the oil discharged from the oil pump continuously increases as the number of revolutions of the inner rotor increases. When the pressure discharged from the oil pump is excessively high, each engine such as an engine may not only cause mechanical damage, but also cause deterioration of the efficiency of the entire system. Therefore, in order to prevent this, Korean Patent No. 10-1491175 discloses a variable oil pump capable of selectively reducing the space between the outer ring and the inner rotor.

In the conventional variable oil pump as described above, the outer ring is hinged to the inside of the housing part, and the outer ring moves as the outer ring is pressurized by oil introduced between the outer ring and the housing part, thereby between the outer ring and the inner rotor. It is characterized in that the oil compression space is reduced.

In this case, the conventional variable oil pump has a structure in which the outer ring moves along a certain trajectory within the housing part on the basis of the hinged portion of the inner wall of the housing part. Such a conventional variable oil pump has a problem that the amount of oil supplied to the engine through the oil pump is not effectively and stably adjusted in response to the change in the amount of oil required by the engine according to the change of the engine speed. .

The present invention has been made to solve the above problems, the object of the present invention is to provide an oil pump to effectively and stably adjust the amount of oil supplied to the engine in response to the change in the amount of oil required by the engine There is this.

The present invention provides an oil pump for sucking and discharging oil, comprising: a housing part; A stator part which is accommodated in the housing part and includes an outer ring forming a variable chamber in which oil flows between the housing part, and a main pressing end protruding outward from an outer circumferential surface of the outer ring; A rotor part accommodated in the outer ring and configured to suck and discharge oil through rotation; A spring portion including a main spring pressurizing the stator portion and allowing the outer ring to be movable within the housing portion; It is installed on the outer circumferential surface of the outer ring, is slidably installed in the first guiding groove formed on the inner wall of the housing portion, and guides the movement of the outer ring as the outer ring is pressed by oil introduced into the variable chamber. A guiding part including a first guiding member and guiding a movement of the outer ring; And an sealing part interposed between the housing part and the stator part to prevent the oil introduced into the variable chamber from leaking into another space between the housing part and the stator part.

The first guiding groove is formed on the opposite side of the variable chamber when the outer ring is based on the outer ring, and the first guiding member is provided on an outer circumferential surface of the outer ring on the opposite side of the variable chamber, and the spring part includes: One end may further include a first auxiliary spring in contact with an outer circumferential surface opposite to the main spring of the outer ring and the other end in contact with an inner wall of the housing part.

The stator portion further includes a first auxiliary pressing end protruding from an outer circumferential surface of the outer ring to surround the first auxiliary spring, and the sealing part is interposed between an inner wall of the outer ring and the first auxiliary spring. It may include a first sealing member.

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

The main spring has one end in contact with the main pressing end and the other end in contact with the inner wall of the housing part, and presses the stator part to a side opposite to a direction in which oil introduced into the variable chamber presses the outer ring. Can be.

The housing part has a second guiding groove formed on an inner wall of the opposite side of the main spring on the basis of the main pressing end, and the guiding part is provided on an outer circumferential surface of the outer ring and is slidable to the second guiding groove. It may further include a second guiding member to be installed.

The first guiding groove is formed along a direction away from the main spring in a position adjacent to the main spring, the main guiding groove is formed along a direction opposite to the direction of the force applied to the main pressing end, the second The guiding groove may be formed to face the main pressing end side on an inner wall of the housing part in which the variable chamber is formed.

The housing part has a second guiding groove formed on an inner wall of the first auxiliary pressing end side, and the guiding part is provided on an outer circumferential surface of the outer ring and slidably installed on the second guiding groove. It may further include a ding member.

The stator unit further includes a third auxiliary pressing end projecting outwardly from an outer circumferential surface portion of the outer ring between the first guiding member and the main pressing end, wherein the main spring has one end of the third auxiliary pressing end. The other end is in contact with the inner end portion of the housing portion on the side of the main pressing end is arranged to press the stator portion.

The housing part has a second guiding groove formed on an inner wall of the side adjacent to the variable chamber, and the guiding part is provided on an outer circumferential surface of the outer ring and slidably installed on the second guiding groove. Further comprising a ding member, wherein the main spring, 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 of the second guiding groove side can press the stator portion.

According to the oil pump according to the present invention, the guide portion including the first and second guide members for guiding the movement of the outer ring at different positions, and the first and second auxiliary to movably support the outer ring at different positions By providing a spring portion including a spring, the outer ring can be moved along various trajectories within the housing portion.

Therefore, according to the oil pump according to the present invention, in response to a change in the amount of oil required by the engine according to the speed change of the engine, the amount of oil supplied to the engine can be effectively and stably adjusted.

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

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

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

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

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

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

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

The housing part 110 is formed with a suction port and a discharge port through which oil is sucked and discharged, and the stator unit 120, the rotor unit 130, the spring unit 140, the guiding unit 150, and the sealing unit 160. ) Housed inside. In addition, a variable chamber 110a is formed between the housing 110 and the stator 120 to bypass some of the oil discharged to the outside through the discharge port of the housing 110.

The stator unit 120 includes an outer ring 121, a main pressing stage 122, a first auxiliary pressing stage 123, and a second auxiliary pressing stage 124. The outer ring 121 is accommodated in the housing part 110 and forms the variable chamber 110a between the housing part 110 and the 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 stage 123 is formed to protrude from an outer circumferential surface of the outer ring 121 corresponding to the opposite side of the main pressing stage 122. The second auxiliary pressing stage 124 protrudes from the end of the main pressing stage 122 toward the radial reference outer side of the outer ring 121. Here, the first auxiliary pressing stage 123 may be formed in a pair spaced apart from each other along the circumferential direction of the outer ring 121. In addition, the second auxiliary pressing stage 124 may be formed in a pair disposed spaced apart from each other.

The rotor unit 130 is accommodated in the outer ring 121 to suck and discharge oil through rotation, and includes an outer rotor 131, an inner rotor 132, and a rotating shaft 133. The outer rotor 131 is fixedly coupled to the outer ring 121 such that an 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 pressure chamber 131a is formed between the outer rotor 131 and the oil sucked in and pressurized. The outer rotor 131 and the inner rotor 132 are installed to engage gear teeth formed on the inner and outer circumferential surfaces thereof, respectively.

The rotation shaft 133 is rotatably fixed to the housing part 110, and is installed through the center of the inner rotor 132 to be fixedly coupled to the inner rotor 132. The rotation shaft 133 is rotated together with the inner rotor 132 by receiving the power of the engine.

The spring 140 is to support the stator 120 so as to be movable within the housing 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 of the variable chamber 110a based on the main pressing stage 122. The main spring 141 is disposed 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 part 110. Accordingly, the main spring 141 presses the stator part 120 to the side opposite to the direction in which the oil introduced into the variable chamber 110a presses the stator part 120.

The first auxiliary spring 142 is disposed between the pair of first auxiliary pressing ends 123, one end of which is in contact with an outer circumferential surface of the outer ring 121, and the other end of which is an inner wall of the housing part 110. Heads up. The second auxiliary spring 143 is disposed between the pair of second auxiliary pressing stages 124, one end of which is in contact with the end of the main pressing stage 122, and the other end of the housing part 110 Facing the inner wall

Meanwhile, when the housing part 110 is based on the stator part 120, the first guiding groove 111 is formed on an inner wall opposite to the variable chamber 110a. In addition, when the housing part 110 is based on the main pressing end 122, the second guiding groove 112 is formed on the inner wall of the opposite side of the main spring 141.

The guiding part 150 guides the movement of the stator part 120 and includes a first guiding member 151 and a second guiding member 152. The first guiding member 151 is fixedly installed on an outer circumferential surface opposite to the variable chamber 110a of the outer circumferential surface of the outer ring 121. The first guiding member 151 is slidably inserted into the first guiding groove 111. Accordingly, the first guiding member 151 guides the movement of the stator unit 120 as the outer ring 121 is pressed by the oil introduced into the variable chamber 110a.

The second guiding member 152 has an outer circumferential surface of the outer ring 121 on the side of the variable chamber 110a, that is, the main spring 141 when the main pressing end 122 is used as a reference. It is fixed to the outer circumferential surface of the outer ring 121 of the side that is not. The second guiding member 152 is slidably inserted into the second guiding groove 112. Accordingly, the second guiding member 152 guides the movement of the stator 120 together with the first guiding member 151.

According to the oil pump 100 according to the present invention, the stator unit 120 may be disposed in a state of maintaining structural stability inside the housing unit 110. That is, the pressure applied by the main spring 141 to the stator unit 120 upwards is transferred to the second guiding member 152 and the variable chamber 110a inserted into the second guiding groove 112. The introduced oil may be supported by the pressure applied to the stator unit 120. In addition, the pressure applied by the first auxiliary spring 142 to the stator part 120 may include the first guiding member 151 and the second auxiliary spring 143 inserted into the first guiding groove 111. It may be supported by the pressure applied to the stator unit 120. Accordingly, in the oil pump 100 according to the exemplary embodiment of the present invention, the stator part 120 may maintain a structurally stable state inside the housing part 110.

In addition, the oil pump 100 according to the present invention, the stator unit 120 in the state in which the first and second

auxiliary springs

142 and 143 disposed at different positions are not fixed to the inner wall of the housing unit 110. To the stator part 120 while the first and second guiding

members

151 and 152 slidably contact the first and second guiding

grooves

111 and 112. As the structure is designed, as the stator part 120 is pressed by the oil introduced into the variable chamber 110a, the stator part 120 follows various trajectories within the housing part 110. You can move it. Therefore, according to the oil pump 100 according to the present invention, in response to the change in the amount of oil required by the engine according to the speed change of the engine, the amount of oil supplied to the engine can be effectively and stably adjusted.

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

The second guiding groove 112 may be formed to face the main pressing end 122 on an inner wall of the housing part 110 in which the variable chamber 110a is formed. That is, as shown in FIGS. 1 and 2, the second guiding groove 112 may be formed in a diagonal direction toward the lower right from the inner wall of the housing part 110 in which the variable chamber 110a is formed. It can be.

When the first and second guiding

grooves

111 and 112 are formed in such a structure, the stator part 120 in which the first and second guiding

members

151 and 152 and the first and second guiding

members

151 and 152 are fixed is installed. ) May be smoothly guided downward along the first and second guiding

grooves

111 and 112.

However, this is only one of several embodiments of the present invention, and the first and second guiding

grooves

111 and 112 may be formed in various shapes according to the movement form of the stator part 120 desired by the operator. .

The sealing part 160 is interposed between the housing part 110 and the stator part 120 so that oil introduced into the variable chamber 110a is between the housing part 110 and the stator part 120. It is prevented from leaking to a space other than the variable chamber 110a of the space of the. To this end, the sealing unit 160, the first sealing member 161 and the 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 110 and the other end of the second auxiliary spring 143. As such, the first and

second sealing members

161 and 162 are provided at both sides of the variable chamber 110a, respectively, to prevent the oil introduced into the variable chamber 110a from leaking into other spaces.

Hereinafter, the oil pump 100 according to the second to fourth embodiments of the present invention will be described in detail with reference to FIGS. 3 to 5. At this time, the oil pump 100 according to the second to fourth embodiments of the present invention to focus only on the parts that are 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 may include a second guiding groove 112 on an inner wall of the side of the first auxiliary pressing stage 123. ) Is formed, and the guiding part 150 further includes a second guiding member 152 installed on the outer circumferential surface of the outer ring 121 and slidably installed in the second guiding groove 112. can do.

When the second guiding groove 112 and the second guiding member 152 are disposed in such a structure, the force transmitted to the main pressing end 122 by the main spring 141 is the second. It is not directly transmitted to the guiding member 152 may protect the second guiding member 152. In this case, the main spring 141 presses the stator part 120 in a direction opposite to a direction in which oil introduced 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 unit 120 may be formed between the first guiding member 151 and the main pressurization stage 122. It may further include a third auxiliary pressing end 125 protruding outward from the outer peripheral surface portion of the outer ring 121. The main spring 141 is disposed such that one end is in contact with the third auxiliary pressing end 125 and the other end is in contact with an inner wall portion of the housing part 110 on the main pressing end 122 side.

In the case where the main spring 141 is arranged in such a structure, when the oil introduced into the variable chamber 110a is applied to the stator part 120 in a counterclockwise direction when the main spring 141 is disposed as shown in FIG. 4. The main spring 141 may apply a force to the stator 120 in a clockwise direction corresponding to the opposite direction. Accordingly, the oil pump 100 according to the present invention can more flexibly adjust the amount of oil discharged according to the oil introduced into the variable chamber 110a.

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

As the oil pump 100 according to the present invention is designed with various structures as described above, the stator unit 120 is pressed by the oil introduced into the variable chamber 110a. The interior of the unit 110 may be moved along various trajectories. Therefore, according to the oil pump 100 according to the present invention, in response to the change in the amount of oil required by the engine according to the speed change of the engine, the amount of oil supplied to the engine can be effectively and stably adjusted.

Claims

In the oil pump for sucking and discharging oil,

A housing part;

A stator part which is accommodated in the housing part and includes an outer ring forming a variable chamber in which oil flows between the housing part, and a main pressing end protruding outward from an outer circumferential surface of the outer ring;

A rotor part accommodated in the outer ring and configured to suck and discharge oil through rotation;

A spring portion including a main spring pressurizing the stator portion and allowing the outer ring to be movable within the housing portion;

It is installed on the outer circumferential surface of the outer ring, is slidably installed in the first guiding groove formed on the inner wall of the housing portion, and guides the movement of the outer ring as the outer ring is pressed by oil introduced into the variable chamber. A guiding part including a first guiding member and guiding a movement of the outer ring; And

An oil pump interposed between the housing part and the stator part and including a sealing part to prevent oil flowing into the variable chamber from leaking into another space between the housing part and the stator part.
The first guiding groove is formed on the opposite side of the variable chamber when the outer ring is based on the outer ring, and the first guiding member is provided on an outer circumferential surface of the outer ring on the opposite side of the variable chamber,

The spring part further comprises a first auxiliary spring whose one end is in contact with the outer circumferential surface opposite to the main spring of the outer ring and the other end is in contact with the inner wall of the housing part.
The method according to claim 2,

The stator unit further includes a first auxiliary pressing end protruding from an outer circumferential surface of the outer ring to surround the first auxiliary spring,

The sealing part, the oil pump including a first sealing member interposed between the inner wall of the outer ring and the first auxiliary spring.
The method according to claim 2,

The spring portion further includes a second auxiliary spring whose one end is in contact with the main pressing end and the other end is in contact with the inner wall of the housing part.

The stator unit further comprises a second auxiliary pressurizing end protruding from the main pressurizing end to surround the second auxiliary spring.
The method according to claim 2,

The main spring has one end in contact with the main pressing end and the other end in contact with the inner wall of the housing part, and presses the stator part to a side opposite to the direction in which oil introduced into the variable chamber presses the outer ring. Oil pump.
The method according to claim 5,

The housing portion, the second guiding groove is formed on the inner wall opposite the main spring on the basis of the main pressing end,

The guiding part is installed on an outer circumferential surface of the outer ring, the oil pump further comprises a second guiding member slidably installed in the second guiding groove.
The method according to claim 6,

The first guiding groove is formed along a direction away from the main spring at a position adjacent to the main spring, and is formed along a direction opposite to the direction of the force applied by the main spring to the main pressing end.

The second guiding groove is an oil pump formed to face the main pressing end side from the inner wall of the housing portion in which the variable chamber is formed.
The method according to claim 5,

The housing portion, the second guiding groove is formed on the inner wall of the first auxiliary pressing end side,

The guiding part is installed on an outer circumferential surface of the outer ring, the oil pump further comprises a second guiding member slidably installed in the second guiding groove.
The method according to claim 1,

The stator portion further includes a third auxiliary pressing end projecting outward from an outer circumferential surface portion of the outer ring between the first guiding member and the main pressing end,

The main spring, the one end is in contact with the third auxiliary pressing end and the other end is disposed so as to contact the inner wall portion of the housing portion on the side of the main pressing end to pressurize the stator part.
The method according to claim 1,

The housing portion, the second guiding groove is formed on the inner wall of the side adjacent to the variable chamber,

The guiding part further includes a second guiding member installed on an outer circumferential surface of the outer ring and slidably installed in the second guiding groove.

The main spring, the oil pump is disposed so 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 on the side of the second guiding groove.