KR20220103457A - A rotary engine - Google Patents

Abstract

The present invention relates to a rotary engine. The rotary engine according to one aspect of the present specification comprises: a rotor body; and a plurality of seals installed on the rotor body. The rotor body is formed in a triangular prism shape which includes: three side surfaces facing the inner surface of a rotor housing; three end parts forming boundary surfaces of two side surfaces adjacent to each other among the three side surfaces; two main surfaces respectively facing a front housing and a rear housing; and a rotary shaft insertion unit penetrating the two main surfaces. The plurality of seals comprise: a first seal installed at an outer edge unit of the main surface of the rotor body; a circular second seal installed around the rotary shaft insertion unit among the main surfaces of the rotor body; a third seal installed in a space between the first seal and the second seal among the main surfaces of the rotor body. The third seal blocks an oil flowing into an accommodation space due to a negative pressure in the accommodation space generated during a suction process. An objective of the present invention is to provide the rotary engine capable of effectively suppressing oil leakage.

Description

Rotary Engine {A ROTARY ENGINE}

This specification relates to a rotary engine. More particularly, it relates to a rotary engine capable of effectively suppressing oil leakage occurring in a main surface portion of a rotor during the suction process of the rotary engine.

In general, a rotary engine refers to an engine that produces power through rotational motion. A rotary engine has a simpler structure than a piston engine, so it is easy to miniaturize, and it has a characteristic of producing a high output with a small displacement because of the continuous combustion stroke. In addition, the rotary engine has the advantage of having less vibration and noise compared to the piston engine because the rotational force is uniform, and emitting less nitrogen oxide.

Therefore, due to the above-mentioned advantages, in recent years, rotary engines have been applied not only to main engines of automobiles and aircraft, but also to compressors of heat pump systems due to their simple structure.

The rotary engine includes a housing having an inner surface of an epitrochoid curve and a rotor rotating within the housing, and when the rotor has a triangular prism, three combustion chambers may be formed by the rotor and the housing.

In each combustion chamber, four strokes consisting of intake, compression, combustion and expansion, and exhaust are performed. Accordingly, when the rotor rotates once, the four strokes are performed three times.

In particular, in the case of a rotary engine, in many cases, an intake valve for injecting fuel or air into the combustion chamber and an exhaust valve for discharging fuel or air from the combustion chamber are not separately provided in many cases. Therefore, intake and exhaust can proceed more smoothly, and the efficiency of gas exchange is good.

On the other hand, in the case of a rotary engine, as fuel or air is injected into the combustion chamber and causes an explosion stroke, excessive heat may be generated. Accordingly, the temperature of the rotary engine may increase, and the temperature increase of the rotary engine may reduce the overall efficiency of the rotary engine.

As a method for cooling a rotary engine, an oil-cooling method, which circulates oil to lubricate components such as a rotating shaft, and an air-cooling method, which circulates air and cools it through convection or conduction, can be considered. have.

In particular, in the case of an oil cooling method in which a rotary engine is cooled by circulating oil, there is a problem in that oil must be supplied periodically. This is because the oil may leak into the combustion chamber while lubricating the rotary engine, and the oil leaked into the combustion chamber may be burned and lost together with the fuel.

Accordingly, the efficiency of the rotary engine is improved by adding a configuration for recovering the supplied oil to prevent oil leakage or reduce the amount of oil leakage.

1 is an exploded perspective view of a rotor and a plurality of seals provided in the rotor according to the prior art, and FIG. 2 is a conceptual diagram for explaining the behavior of oil generated during compression and combustion (expansion) process. , Figure 3 shows a conceptual diagram for explaining the behavior of the oil generated in the suction process.

The rotor, which is eccentrically rotatably installed inside the rotor housing, may be provided in various shapes. Hereinafter, for convenience of description, a case in which the rotor is provided in a triangular pole shape or a similar shape will be described.

As shown in FIG. 1 , the rotor 200 includes a rotor body 210 .

The rotor body 210 includes a first side surface 211 forming one side surface of the rotor body 210 , a second side surface 213 forming the other side surface of the rotor body 210 , the first side surface 211 and the second side surface 211 . A third side surface 215 provided to connect the two side surfaces 213 may be included.

The first to third side surfaces 211 , 213 , and 215 may refer to at least a portion of the outer surface of the rotor 200 .

And the rotor body 210 may further include a main surface 217 facing each of the front housing (front housing) and the rear housing (rear housing).

The rotor 200 may include a combustion chamber 220 recessed in the rotor body 210 to provide a space in which fuel and air can be combusted.

The combustion chamber 220 may be recessed from the outer surface of the rotor body 210 toward the inside of the rotor body 210 , and may be provided on the first to third side surfaces 211 , 213 , and 215 , respectively.

As the rotor 200 includes the three side surfaces 211 , 213 , and 215 , the rotor 200 may divide the inner space of the rotor housing into three accommodating spaces.

However, since different strokes are performed in the three accommodating spaces, the three accommodating spaces must be kept airtight from each other.

Therefore, in order to maintain airtightness between the three accommodation spaces, the three side surfaces 211 , 213 , and 215 have an apex seal 241 on each of the three ends 231 formed in contact with each other so as to be in close contact with the inner circumferential surface of the rotor housing. ) are provided respectively.

And a corner seal 242 and a side seal 243 are provided on each of the two main surfaces 217, respectively, and the corner seal 242 has a coupling groove for accommodating the apex seal 241 (not shown). not) is provided.

On the other hand, the rotor body 210 is provided with a rotating shaft coupling portion 250 that is formed to pass through the two main surfaces 217 and coupled to the rotation shaft, and a cut-off is provided on the main surface 217 around the rotation shaft coupling portion 250 . A cut-off seal 244 , an outer oil seal 245 , and an inner oil seal 246 are provided, respectively.

In addition, the above-mentioned various seals 241 to 246 are each elastically supported by an elastic body.

The cut-off seal 244 , the outer oil seal 245 , and the inner oil seal 246 prevent the metering oil from leaking from the main surface 217 of the rotor body 210 into the combustion chamber.

However, in the compression and combustion (expansion) process of the rotary engine, gas is supplied from the combustion chamber toward the main surface 217 as shown by the thick arrow in FIG. 2 , so the oil located on the main surface 217 of the rotor 200 is shown in FIG. As shown by the thin arrow of 2, it circulates in the main surface 217 part.

Accordingly, when the pressure on the combustion chamber side is higher than the oil pressure on the main surface of the rotor as in the compression and combustion (expansion) process of the rotary engine, the oil located on the main surface 217 is unlikely to leak toward the combustion chamber.

However, since the inside of the combustion chamber is formed at negative pressure while the suction process is being performed in the combustion chamber, the gas of the combustion chamber does not flow toward the main surface, but rather the main surface inside the side seal 243 and the corner seal 242 as shown in FIG. 3 It can be said that the oil located in the part leaks to the combustion chamber side by negative pressure in many cases.

Therefore, there is a problem in that it is not easy to suppress oil leakage occurring in the suction process of the rotary engine only with the conventional seal.

In order to solve this problem, a rotary engine employing an oil recovery structure for reducing the amount of leakage oil is disclosed in Japanese Patent Laid-Open No. 2013-072425 (hereinafter referred to as a prior document).

Hereinafter, the oil recovery structure of the prior art will be briefly described with reference to FIGS. 4 and 5 .

4 is a plan view of a rotor employing an oil recovery structure according to the prior art and a plurality of seals provided in the rotor, and FIG. 5 is a cross-sectional view of FIG. 4 "VI-VI".

4 and 5, in the prior literature, an oil return hole 260 communicating with the inside of the rotor body 210 is installed in the groove portion 217a of the main surface 217 where the inner oil seal 246 is installed. recovering oil.

4 and 5 , an unexplained reference numeral 243 denotes a side seal, 244 denotes a cut-off seal, and an unexplained reference numeral 245 denotes an outer oil seal.

However, in the case of the prior literature, there may be a problem in that the oil existing inside the rotor body 210 flows back through the oil recovery hole 260 .

Accordingly, there is a demand for a technology capable of effectively suppressing the oil leakage amount generated from the main surface of the rotor without considering the reverse flow of oil.

Japanese Patent Laid-Open No. 2013-072425 (published on April 22, 2013)

SUMMARY OF THE INVENTION An object of the present specification is to provide a rotary engine capable of effectively suppressing oil leakage occurring in a main surface portion of a rotor during a suction process of the rotary engine.

Another object to be solved by the present specification is to provide a rotary engine capable of effectively suppressing oil leakage occurring in the main surface of a rotor without considering the reverse flow of oil.

Another object to be solved by the present specification is to provide a rotary engine capable of reducing the amount of oil supplied to the rotary engine by effectively reducing the oil leakage amount.

A rotary engine according to one aspect of the present specification includes a rotor body and a plurality of seals installed on the rotor body, wherein the rotor body includes three side surfaces facing the inner surface of the rotor housing, and one of the three side surfaces adjacent to each other It is formed in a triangular prism shape having three ends forming a boundary surface of two side surfaces, two main surfaces facing the front housing and the rear housing, respectively, and a rotation shaft insert penetrating the two main surfaces, the plurality of of the seal, a first seal installed on the outer part of the main surface of the rotor body, a circular second seal installed around the rotation shaft insertion part on the main surface of the rotor body, and the first seal on the main surface of the rotor body and a third seal installed in a space between the seal and the second seal, wherein the third seal blocks oil flowing into the accommodation space due to a negative pressure of the accommodation space generated during a suction process.

The third seal includes a first portion having a first length, and a shortest distance between the first portion and a corner seal included in the first seal is smaller than a shortest distance between the first portion and the second seal. do.

The third seal may include at least one second portion extending from at least one of both ends of the first portion.

According to the rotary engine having such a configuration, it is possible to effectively suppress oil leakage occurring in the main surface of the rotor during the suction process without considering the reverse flow of oil.

Therefore, the amount of oil supplied to the rotary engine can be reduced by effectively reducing the oil leakage amount.

1 is an exploded perspective view of a rotor according to the prior art and a plurality of seals provided in the rotor.
2 is a conceptual diagram for explaining the behavior of oil generated during compression and combustion (expansion) process.
3 is a conceptual diagram for explaining the behavior of oil generated in the suction process.
4 is a plan view of a rotor employing an oil recovery structure according to the prior art and a plurality of seals provided in the rotor.
5 is a cross-sectional view "VI-VI" of FIG.
6 is an exploded perspective view of a rotary engine having a seal structure according to a first embodiment of the present specification.
Fig. 7 is a view showing the configuration of a main part of the rotor shown in Fig. 6;
FIG. 8 is a view showing an operating principle of the rotary engine shown in FIG. 6 .
9 is a view illustrating a flow path of oil supplied to a rotating shaft in the rotary engine shown in FIG. 6 .
10 is a conceptual diagram for explaining the behavior of oil generated in the suction process in the rotor having the seal structure according to the first embodiment of the present specification.
11 is a plan view of a rotor having a seal structure according to a second embodiment of the present specification.
12 is a plan view of a rotor having a seal structure according to a third embodiment of the present specification.
13 is a plan view of a rotor having a seal structure according to a fourth embodiment of the present specification.

Hereinafter, embodiments of the present specification will be described in detail with reference to the accompanying drawings. However, the present specification is not limited to these embodiments and may be modified in various forms, of course.

In the drawings, in order to clearly and briefly describe the present specification, the illustration of parts irrelevant to the description is omitted, and the same reference numerals are used for the same or extremely similar parts throughout the specification. And in the drawings, in order to make the description more clear, the thickness, width, etc. of the components are selectively enlarged or reduced regardless of the numerical range described in the detailed description. Not limited to bars.

And, when a certain part "includes" another part throughout the specification, other parts are not excluded unless otherwise stated, and other parts may be further included. In addition, when a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where the other part is "directly on" but also the case where another part is located in the middle. When a part, such as a layer, film, region, plate, etc., is "directly above" another part, it means that no other part is located in the middle.

Hereinafter, embodiments of the present specification will be described with reference to the accompanying drawings.

6 is an exploded perspective view of a rotary engine having a seal structure according to a first embodiment of the present specification, and FIG. 7 is a view showing the configuration of main parts of the rotor shown in FIG. 6 .

And FIG. 8 is a view showing an operating principle of the rotary engine shown in FIG. 6 , and FIG. 9 is a view showing a flow path of oil supplied to a rotating shaft in the rotary engine shown in FIG. 6 .

In describing the embodiments of the present specification, the same reference numerals are assigned to the same components as those provided in the conventional rotary engine described above.

Referring to the drawings, the rotary engine 10 includes a housing 100 forming an accommodation space, a rotor 200 provided to rotate eccentrically inside the housing 100, and the rotor 200 by being coupled to the rotor 200 . It may include a rotating shaft 300 for rotating.

The housing 100 includes a rotor housing 110 having both ends open to form an accommodating space S, a front housing 120 coupled to one end of the rotor housing 110 to seal the accommodating space S, and a rotor housing. It may include a rear housing 130 coupled to the other end of the 110 to seal the accommodation space (S).

The front housing 120 and the rear housing 130 may be respectively coupled to the rotor housing 110 to face each other, and may be provided at a spaced apart position. Accordingly, the front housing 120 and the rear housing 130 may seal the accommodation space S formed by the rotor housing 110 .

On the other hand, at least one of the rotor housing 110 or the front and rear housings 120 and 130 has an intake port 131 for guiding fuel or air into the accommodation space S and fuel or air located in the accommodation space S. An exhaust port 133 for discharging to the outside of the accommodation space S may be provided.

The rotor 200 may be eccentrically rotatably provided inside the rotor housing 110 . In other words, the rotor 200 may be located in the receiving space (S). Also, the rotor housing 110 may be provided to surround at least a portion of the rotor 200 .

The shape of the rotor 200 may be provided in various ways. As will be described later, since the shape of the rotor 200 determines the shape of the inner circumferential surface of the rotor housing 110 , when the shape of the rotor 200 is changed, the shape of the rotor housing 110 is also changed.

However, hereinafter, for convenience of description, a case in which the rotor 200 is provided in a triangular pole shape or a shape similar thereto will be described.

The rotor 200 includes a rotor body 210 that is eccentrically rotatably provided in the interior or accommodation space S of the rotor housing 110 .

The rotor body 210 includes a first side surface 211 forming one side of the rotor body 210 , a second side surface 213 and a first side surface 211 forming the other side of the rotor body 210 , A third side surface 215 provided to connect the two side surfaces 213 may be included.

In this case, the first to third side surfaces 211 , 213 , and 215 may mean at least a portion of the outer surface of the rotor 200 .

The rotor 200 may include a combustion chamber 220 recessed in each side surface 211 , 213 , and 215 to provide a space in which fuel and air can be combusted.

The combustion chamber 220 may be recessed from the outer surface of the rotor body 210 toward the inside of the rotor body 210 .

In addition, the combustion chamber 220 may be provided on the first to third side surfaces (211, 213, 215), respectively.

The rotor 200 is provided to rotate eccentrically in the accommodating space S, and rotates so as to be in close contact with the inner circumferential surface 111 of the rotor housing 110 . Accordingly, the combustion chamber 220 may provide a space in which fuel and air may be combusted while the rotor 200 is in close contact with the inner circumferential surface 111 of the rotor housing 110 .

As the rotor body 210 includes three side surfaces 211 , 213 , and 215 , the rotor body 210 may divide the accommodation space S into three spaces.

The rotor body 210 may form a portion in close contact with the inner circumferential surface 111 of the rotor housing 110 to divide the accommodating space S into three spaces.

To this end, the rotor body 210 may include three end portions 230 forming an interface between two adjacent side surfaces among the three side surfaces 211 , 213 , and 215 .

In order to maintain airtightness between the spaces partitioned into three spaces in the receiving space S by the rotor 200 , the rotor 200 may include a first seal.

The first seal includes an apex seal 241 installed at each of the three ends 230 , and outer portions of the two main surfaces 217 provided in the rotor body 210 , in particular, the two main surfaces 217 . A corner seal 242 installed in a portion adjacent to the three end portions 230, and a side seal installed in a portion adjacent to the three side surfaces 211, 213, and 215 of the two main surfaces 217, respectively (243) may be included.

The apex seal 241 is a contact part 2413 in close contact with the inner circumferential surface 111 of the rotor housing 110 and an elastic part 2411 coupled to the contact part 2413 to provide an elastic force to the contact part 2413. may include

The contact portion 2413 may be coupled from the rotor body 210 toward the inner circumferential surface 111 of the rotor housing 110 to be in contact with the inner circumferential surface 111 of the rotor housing 110 . However, in order to keep the contact part 2413 in contact with the inner circumferential surface 111 of the rotor housing 110 , a force provided toward the inner circumferential surface 111 of the rotor housing 110 is required for the contact part 2413 . can

The elastic part 2411 applies a force in a direction toward the inner circumferential surface 111 of the rotor housing 110 to the contact part 2413 so that the contact part 2413 is always in close contact with the inner circumferential surface 111 of the rotor housing 110 . (2413) may be provided.

Accordingly, the elastic part 2411 may be provided inside the rotor 200 rather than the close contact part 2413 .

The rotor 200 may include a rotation shaft insertion part 250 that forms an inner circumferential surface of the rotor body 210 and is coupled to the rotation shaft 300 .

The side seal 242 may be provided such that one end is in contact with the corner seal 241 installed at any one of the plurality of ends 230 and the other end is in contact with the corner seal 241 installed at the other one of the plurality of ends. .

The rotation shaft insertion part 250 may be provided in a shape corresponding to the rotation shaft 300 , and may be provided in a hollow cylindrical shape or a shape similar thereto. In particular, since the rotation shaft insertion part 250 may be coupled to the eccentric part 310 to be described later, the rotation shaft insertion part 250 may be provided in a shape corresponding to the eccentric part 310 .

The rotating shaft 300 is formed to pass through the housing 100 and the rotor 200 , and is coupled to the rotor 200 to rotate the rotor 200 .

More specifically, the rotation shaft 300 may be formed to sequentially pass through the front housing 120 , the accommodation space S, and the rear housing 130 .

The rotation shaft 300 includes an eccentric portion 310 coupled to the rotation shaft insertion portion 250, and a first extension portion coupled to the front housing 120 by extending from the eccentric portion 310 in a direction away from the rear housing 130 ( 320 , and a second extension 330 extending in a direction away from the front housing 120 from the eccentric portion 310 to be coupled to the rear housing 130 .

The eccentric part 310 may have a larger diameter than the first extension part 320 and the second extension part 330 . That is, the eccentric part 310 connects the first extension part 320 and the second extension part 330 and has the same diameter as the first extension part 320 and the second extension part 330. 311 ) and an extension 313 extending from the central portion 311 to a radially outward direction of the central portion 311 to induce eccentricity.

Accordingly, the rotor 200 may be coupled to the eccentric portion 310 to rotate eccentrically.

The front housing 120 may include a first bearing 125 through which the first extension 320 passes, and the rear housing 130 includes a second bearing 125 through which the second extension 330 passes. 135) may be included.

On the other hand, the rotary engine 10 may include an ignition device for exploding or burning fuel flowing inside the accommodation space (S).

The ignition device is provided in the housing 100 and is formed to penetrate the spark plug 420 provided to communicate with the accommodation space S and the housing 100 to provide a space in which the spark plug 420 can be installed. It may include a hole 410 .

The insertion hole 410 may be provided through at least one of the rotor housing 110 , the front housing 120 , and the rear housing 130 . However, hereinafter, for convenience of description, a case in which the insertion hole 410 is provided in the rotor housing 110 will be limitedly described.

The insertion hole 410 may pass through the inner circumferential surface 111 and the outer circumferential surface of the rotor housing 110 to provide a space in which the spark plug 420 is installed.

The spark plug 420 may be installed in the insertion hole 410 to cause a spark in the accommodation space S. Accordingly, the fuel located in the accommodation space S may be exploded or combusted by the spark plug 420 .

A plurality of spark plugs 420 may be provided. As a plurality of spark plugs 420 are provided, a plurality of insertion holes 410 may also be provided.

Accordingly, the rotor 200 can rotate eccentrically by dividing the receiving space S into three spaces inside the housing 100 . In addition, each of the three spaces partitioned by the rotor 200 may be airtight maintained by the apex seal 241 , the corner seal 242 , and the side seal 243 .

As described above, a portion of the rotor 200 rotates while always maintaining a state in close contact with the inner circumferential surface 111 of the rotor housing 110 . Accordingly, excessive heat may be generated in the rotor 200 , and the excessive heat may reduce reliability of the rotor 200 .

Accordingly, the rotary engine 10 lubricates the rotor 200 by supplying oil to the rotor 200 , and may include an oil supply unit 500 capable of cooling the rotor 200 .

The oil supply unit 500 may be provided in the housing 100 to supply oil to the rotor 200 . The oil supply unit 500 is provided in the housing and includes a supply passage 580 through which oil moves, a sealing portion 530 provided in contact with the rotor 200 to selectively close the supply passage 580 , and a sealing portion. It may include an elastic part 520 for pressing the 530 toward the receiving space (S).

The supply flow path 580 may be formed through the inside of the housing 100 .

Accordingly, it is possible to reduce the volume of the oil supply unit 500 compared to the case where the supply passage 580 is exposed to the outside, and it is possible to prevent the supply passage 580 from being damaged in advance.

In addition, the oil supply unit 500 not only prevents the elastic unit 520 or the sealing unit 530 from being separated from the housing 100 , but also blocks the supply flow path 580 from being exposed to the outside to prevent lubricating oil or fuel. may include a support part 510 for supporting the elastic part 520 to prevent leakage.

Meanwhile, the support part 510 , the elastic part 520 , and the sealing part 530 may be provided in at least one of the front housing 120 and the rear housing 130 to lubricate or cool the rotor 200 . have.

The oil supply unit 500 forms a space in which oil is stored, and circulates the oil stored in the oil storage tank 550 and the oil storage tank 550 provided to be spaced apart from the housing 100 to supply the rotary engine 10 . An oil pump 540 may be further included.

9, the oil supply unit 500 is disposed in the oil flow path and the oil heat exchanger 560 for lowering the temperature of the oil flowing through the oil pump 540 to exclude foreign substances mixed with the oil. An oil filter 570 may be included.

Meanwhile, the above-described support part 510 , the elastic part 520 , and the sealing part 530 may be connected to the oil pump 540 to receive oil from the oil pump 540 . However, it is not necessarily limited thereto, and oil may be supplied through a separate pump.

Hereinafter, an operation process of the rotary engine 10 will be described with reference to FIG. 8 .

Referring to (a) of FIG. 8, an intake stroke in which fuel f is sucked from the intake port is performed. Referring to FIG. 3(b), when the rotor 200 rotates in the intake stroke, fuel f) moves along the end 230 of the rotor 200 or the apex seal 241 and is compressed in close contact with the rotor housing 110 is performed.

Referring to FIG. 8C , the fuel compressed in the compression stroke explodes due to a spark generated from the spark plug 420, and an explosion stroke in which the volume starts to increase explosively is performed.

Referring to FIG. 3D , the rotor 200 rotates at a high speed due to the repulsive force of the explosion stroke, and an exhaust stroke of discharging the oxide of the fuel f to the exhaust port is performed. Thereafter, the rotor 200 performs the aforementioned suction stroke again while rotating due to inertia.

Thereby, the suction stroke, the compression stroke, the explosion stroke and the discharge stroke can be performed sequentially and continuously. However, the above-described strokes may be sequentially performed in any one of the combustion chambers 220 partitioned by the rotor 200, and in the other one of the combustion chambers 220 partitioned by the rotor 200, any one of the combustion chambers ( 220) and a different administration from the one proceeded.

Accordingly, the apex seal 241 must be provided to be in close contact with the inner circumferential surface of the rotor housing 110 in order to maintain airtightness between the accommodation spaces S partitioned by the rotor 200 . That is, the apex seal 241 needs to be continuously lubricated or cooled.

To this end, the rotary engine 10 may lubricate or cool the rotary engine 10 by including the above-described oil supply unit 500 . However, it may be difficult to recover the entire amount of oil supplied to the rotary engine 10 by the oil supply unit 500 . In particular, when the supplied oil flows into the accommodation space S, this is because the oil may also be burned along with the combustion of the fuel.

Hereinafter, a flow path of oil that can flow into the accommodation space S will be described with reference to FIG. 9 .

9 is a view showing a state in which the rotation shaft 300 is lubricated by the oil supply unit 500 .

Referring to FIG. 9 , the oil pump 550 may suck at least a portion of the oil located in the oil storage tank 550 and guide it to the rotation shaft 300 . The oil flowing by the oil pump 550 may flow through at least one of the oil heat exchanger 560 and the oil filter 570 to be supplied to the rotation shaft 300 . That is, the oil heat exchanger 560 and the oil filter 570 may be positioned before the rotation shaft 300 in the oil flow path formed by the oil pump 540 to exchange oil or remove foreign substances contained in the oil.

The oil passing through the oil heat exchanger 560 and the oil filter 570 sequentially passes through the first extension part 320, the eccentric part 310, and the second extension part 330 of the rotation shaft 300 to the rotation shaft 300. A portion in contact with the rotor 200 may be lubricated.

In addition, the oil that has been sequentially passed through the first extension part 320 , the eccentric part 310 , and the second extension part 330 lubricates the contact portion between the rotating shaft 300 and the rotor 200 , and then the oil storage tank 550 . ) and can be recovered.

Accordingly, the oil pump 540 may pull up the oil located in the oil storage tank 550 again and supply it to the rotation shaft 300 .

In addition, the support part 510 , the elastic part 520 , and the sealing part 530 may receive oil from the oil pump 540 and supply oil to the apex seal 241 . As such, the apex seal 241 may be cooled or lubricated.

Meanwhile, the oil lubricating the rotation shaft 300 may leak into the accommodation space S due to the eccentric rotation of the rotor 200 . More specifically, when the rotor 200 rotates, the rotor 200 may generate centrifugal force, and the oil flowing between the rotor 200 and the rotation shaft 300 receives the centrifugal force of the rotor 200 and the rotor 200 . can move outside of

Accordingly, oil may flow largely through the two oil passages in the accommodation space (S). One oil flow path may be formed by the oil supplied to the accommodation space S to cool or lubricate the apex seal 241, and the other oil flow path contains oil for lubricating the rotary shaft 300 of the rotor ( 200) may be formed by the oil moving to the receiving space (S) by receiving the centrifugal force.

And, as described above, the oil introduced into the accommodation space S may be burned and lost together with the fuel when the fuel is burned. That is, the entire amount of oil supplied to the accommodation space S may not be recovered and some may be lost.

In addition, the rotor 200 is supplied with metered oil for lubrication and cooling of the seals, and the metered oil is supplied through the main surface 217 of the rotor body 210 into three receiving spaces, particularly three combustion chambers. may leak.

Accordingly, the rotor 200 has a second seal for preventing the metering oil from leaking through the main surface 217 of the rotor body 210 into three accommodating spaces, in particular, three combustion chambers.

The second seal is installed on the periphery of the rotation shaft insertion part 250 among the main surfaces 217 of the rotor body 210 and includes a cut-off seal 244 formed in a circular annular shape, respectively, and the cut-off seal ( 244 ) and at least one oil seal 245 , 246 installed in a space between the rotation shaft insertion part 250 .

On the other hand, as shown in FIG. 10 , in the embodiment of the present specification, the main surface 217 of the rotor body 210 in the space between the first seal and the second seal contains the accommodating space S generated during the suction process. A third seal 247 for blocking oil flowing into the receiving space S due to the negative pressure is further positioned.

To explain this, oil leaking through the second seal is collected in the space between the first seal and the second seal, and the oil collected in this space is a corner seal due to the negative pressure formed in the combustion chamber during the suction process of the rotary engine. It leaks into the combustion chamber through the 242 and the side seal 243.

Accordingly, when the third seal 247 is installed in the space between the first seal and the second seal, oil accumulated in the space between the first seal and the second seal can be prevented from leaking into the combustion chamber.

The third seal 247 includes a first portion 247a formed with a first length L1 , the shortest distance d1 between the longitudinal central portion of the first portion 247a and the corner seal 242 . ) is formed to be smaller than the shortest distance d2 between the longitudinal central portion of the first portion 247a and the second seal, in particular the cut-off seal 244 .

In addition, the first portion 247a is formed so that the longitudinal center portion is convex toward the corner seal 242 compared to both ends.

Accordingly, the third seal 247 may prevent oil on the main surface 217 of the rotor body 210 from leaking between the side seal 243 and the corner seal 242 during the suction process of the rotary engine. .

Hereinafter, another embodiment of the present specification will be described with reference to FIGS. 11 to 13 .

11 is a plan view of a rotor having a seal structure according to a second embodiment of the present specification, FIG. 12 is a plan view of a rotor having a seal structure according to a third embodiment of the present specification, and FIG. It is a plan view of a rotor having a seal structure according to a fourth embodiment.

First, as shown in FIG. 11 , the third seal 247 may include one second portion 247b extending from either end of both ends of the first portion 247a.

In this case, the second part 247b may extend from an end of the first part 247a in a direction opposite to the rotation direction of the rotor 200 .

In addition, the length L2 of the second part 247b may be longer than the length L1 of the first part 247a.

The second part 247b serves to remove oil adhered to the front housing and the rear housing prior to the side seal 243 .

Meanwhile, as shown in FIG. 12 , the second portion 247b may be formed to extend from both ends of the first portion 247a, respectively.

Although FIG. 12 illustrates a configuration in which the length L2 of each of the two second parts 247b is longer than the length L1 of the first part 247a, the two second parts 247b It is also possible to form only one length longer than the length of the first part.

Meanwhile, as shown in FIG. 13 , the first portion 247a of the third seal 247 may have a longitudinal center portion convex toward the rotation shaft insertion portion 250 compared to both ends thereof.

Although the preferred embodiments of the present specification have been described in detail above, the scope of the present specification is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concepts of the present specification defined in the following claims are also provided herein. is within the scope of the

100: housing 110: rotor housing
120: front housing 130: rear housing
200: rotor 210: rotor body
241, 242, 243: first seal 244, 245, 247: second seal
247: third seal 300: axis of rotation

Claims (17)

a housing that forms an accommodating space in which fuel is combusted, the housing including a rotor housing, a cover housing coupled to the rotor housing and sealing the accommodating space, and a rear housing;
a rotor including a rotor body which is eccentrically rotatably installed inside the housing and partitions the accommodation space; and
A plurality of seals installed on the rotor body
including,
The rotor body includes three side surfaces facing the inner surface of the rotor housing, three ends forming an interface between two adjacent side surfaces of the three side surfaces, and facing the front housing and the rear housing, respectively. It is formed in the shape of a triangular prism having two main surfaces and a rotating shaft insert penetrating the two main surfaces,
The plurality of seals may include a first seal installed on an outer part of a main surface of the rotor body, a second seal formed in a circular annular shape installed around the rotation shaft insertion part on a main surface of the rotor body, and the rotor body and a third seal installed in a space between the first seal and the second seal among the main surfaces of
The third seal is a rotary engine that blocks oil flowing into the accommodation space due to a negative pressure of the accommodation space generated during a suction process. In claim 1,
and the first seal includes a corner seal respectively installed on a portion adjacent to the three ends of the two main surfaces, and a side seal installed on a portion adjacent to the three side surfaces of the two main surfaces, respectively. In claim 2,
The third seal includes a first portion defined in a first length, wherein the shortest distance between the longitudinal central portion of the first portion and the corner seal is the shortest distance between the longitudinally central portion of the first portion and the second seal A rotary engine that is formed smaller than the distance. In claim 3,
wherein said first portion of said third seal is formed such that said longitudinal central portion is convex toward said corner seal relative to both ends. In claim 3,
and wherein the first portion of the third seal has a longitudinal central portion convex toward the rotation shaft insertion portion relative to both ends. In claim 3,
and wherein the third seal includes one second portion extending from either end of both ends of the first portion. In claim 6,
and the second portion extends from an end of the first portion along a direction opposite to a rotational direction of the rotor. In claim 7,
The length of the second part is a rotary engine that is formed to be longer than the length of the first part. In claim 3,
and the third seal includes two second portions each extending from opposite ends of the first portion. In claim 9,
A rotary engine in which a length of any one of the two second portions is longer than a length of the first portion. In claim 9,
The length of each of the two second parts is formed to be longer than the length of the first part. 12. In any one of claims 1 to 11,
The second seal may include a cut-off seal and at least one oil seal installed in a space between the cut-off seal and the rotation shaft insertion part. In claim 12,
The at least one oil seal may include an inner oil seal and an outer oil seal positioned between the inner oil seal and the cut-off seal. In claim 12,
The rotary engine further comprising an apex seal installed at each of the three ends. In claim 12,
A rotary engine provided in the housing and further comprising an oil supply unit for supplying oil to the accommodation space. In claim 15,
The oil supply unit is provided in at least one of the front housing and the rear housing. In claim 12,
The rotary engine further comprising a spark plug coupled to the rotor housing to burn fuel.

Images