JP2019100456A - Elastic oil seal ring - Google Patents

Abstract

To provide an elastic oil seal ring suitable to constitute an oil seal member for sealing a gap between a rotor and a side housing in a rotary piston engine, and capable of preventing oil leakage.SOLUTION: Elastic oil seal rings 1, 2, which are held in ring-shaped seal grooves 4, 5 provided in a rotor 52 rolling in a housing 51, have at least three projection parts 11, 12, 13, 21, 22, 23 projecting toward both lateral surface parts of the seal grooves. At least one projection part 11, 21 projects toward one lateral surface part of the seal grooves 4, 5, and at least the other two projection parts 12, 13, 22, 23 project toward the other lateral surface part of the seal grooves 4, 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an elastic oil seal ring, and more particularly, an elastic oil seal suitable for forming an oil seal member for sealing a gap between a rotor and a side housing in a rotary piston engine and capable of maintaining stable lubricity. On the ring.

  In the rotary piston engine, oil seal members for sealing the gap between the rotor rolling in the housing and the inner surface (side housing) of the housing are provided (Patent Documents 1 to 3).

  The oil seal members 104, 104 are held in an annular inner seal groove 102 and an outer seal groove 103 provided in the rotor 101, as shown in FIG. 9. The oil seal members 104 and 104 are respectively constituted by a hard oil seal ring 105 and an elastic oil seal ring (O-ring) 106.

  The hard oil seal rings 105, 105 are formed in a ring shape by a hard material such as metal or carbon material, and are held in the inner and outer seal grooves 102, 103. Between the bottom of the inner and outer seal grooves 102, 103 and the hard oil seal rings 105, 105, push springs 107, 107 are arranged. The hard oil seal rings 105, 105 are urged in the direction of coming out of the inner and outer seal grooves 102, 103 by the push springs 107, 107, and the side surface portions (seal surfaces) 105a, 105a are pressed against the side housing 108. Oil is lubricated between the side surface portions 105a and 105a and the side housing 108 to such an extent that good lubricity can be maintained.

  The hard oil seal ring 105 held in the inner seal groove 102 has an annular groove 105 b in the outer peripheral surface portion. The hard oil seal ring 105 held in the outer seal groove 103 has an annular groove 105 b in the inner peripheral surface portion. An elastic oil seal ring (O-ring) 106 is disposed in each of the annular grooves 105 b and 105 b. The elastic oil seal ring 106 is formed in a ring shape having a circular cross section by an elastic material such as fluorine rubber (FKM), and is disposed inside and outside the annular seal groove 105 b of the hard oil seal ring 105 105. It is held in the seal grooves 102, 103.

  The elastic oil seal ring 106 held in the inner seal groove 102 is in contact with one side (outside) of the inner seal groove 102 and the hard oil seal ring 105. The elastic oil seal ring 106 seals oil leaked from the gap between the hard oil seal ring 105 and the rotor 101.

  The hard oil seal ring 105 held in the outer seal groove 103 is in contact with one side (inner side) of the outer seal groove 103 and the hard oil seal ring 105. The elastic oil seal ring 106 is configured to hold the oil which can not be stopped by the hard oil seal ring 105 held in the inner seal groove 102, the hard oil seal ring 105 held in the outer seal groove 103 and the side surface of the outer seal groove 103. Seal between.

JP, 2013-72425, A Japanese Utility Model Publication No. 61-137801 Japanese Utility Model Publication No. 58-152501

  In the oil seal member 105 of the rotary piston engine as described above, as shown in FIG. 10, in the annular groove 105b of the hard oil seal ring 105, the elastic oil seal ring 106 is the side of the side surface portion (seal surface) 105a. Misalignment may occur. Such misalignment occurs when the elastic oil seal ring 106 is mounted in the annular groove 105b in a twisted state.

  When such a positional deviation occurs, the elastic oil seal ring 106 interferes (contacts) with the hard oil seal ring 105, and stable lubricity can not be maintained.

  Therefore, it is an object of the present invention to provide an elastic oil seal ring suitable for forming an oil seal member for sealing a gap between a rotor and a side housing in a rotary piston engine and capable of maintaining stable lubricity. Do.

  Other objects of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

1.
An elastic oil seal ring held in a ring-shaped seal groove provided on a rotor rolling in a housing, comprising:
At least three projecting ridges projecting toward both side faces of the sealing groove, and at least one projecting ridge projecting toward one side face of the sealing groove; An elastic oil seal ring characterized in that a projection is made to project toward the other side of the seal groove.
2.
A hard oil seal ring for sealing the gap between the outer surface of the rotor and the inner surface of the housing is held in the seal groove,
The elasticity according to the above 1, wherein at least one protrusion is brought into contact with one side surface of the seal groove, and the other at least one protrusion is brought into contact with the hard oil seal ring. Oil seal ring.

  According to the present invention, it is possible to provide an elastic oil seal ring suitable for forming an oil seal member for sealing a gap between a rotor and a side housing in a rotary piston engine and capable of maintaining stable lubricity.

An enlarged sectional view showing a state of use of an elastic oil seal ring according to an embodiment of the present invention in a rotary piston engine An exploded perspective view showing the state of use shown in FIG. 1 Sectional view showing the state of use shown in FIG. 1 Sectional perspective view showing the hard oil seal ring in the use state shown in FIG. 1 Sectional view of the elastic oil seal ring (outside) shown in FIG. 1 Cross section of the elastic oil seal ring (inside) shown in FIG. 1 FIG. 2 is a cross-sectional view of the elastic oil seal ring in the use state shown in FIG. An enlarged sectional view showing a state of use of an elastic oil seal ring according to another embodiment of the present invention in a rotary piston engine An enlarged sectional view showing a state of use of a conventional elastic oil seal ring in a rotary piston engine An enlarged sectional view showing a state in which a conventional elastic oil seal ring is used in a rotary piston engine and a positional deviation occurs.

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

  FIG. 1 is an enlarged sectional view showing a state of use of an elastic oil seal ring according to an embodiment of the present invention in a rotary piston engine.

  As shown in FIG. 1, the elastic oil seal rings 1 and 2 according to the present invention constitute oil seal members 3 and 3 in a rotary piston engine 50 to which the elastic oil seal rings 1 and 2 are applied. The gap between the rotor 52 and the inner surface (side housing 53) of the housing 51 is sealed.

  FIG. 2 is an exploded perspective view showing the state of use shown in FIG. FIG. 3 is a cross-sectional view showing the state of use shown in FIG.

  As shown in FIGS. 2 and 3, the rotary piston engine 50 has a housing 51 composed of a bowl-shaped main housing 54 having a trochoid inner circumferential surface 54 a and a pair of side housings 53, 53. It has a substantially triangular rotor 52 housed therein. The outer circumferential surface of the rotor 52 forms three working chambers 58 with the inner surface of the housing 51.

  An eccentric shaft 55 is provided through substantially the center of each side housing 53, 53. The rotor 52 is rotatably supported on an eccentric 55 a of the eccentric shaft 55. Further, an internal gear 52a provided inside the rotor 52 is in mesh with a fixed gear 53a provided in the side housing 53, and the movement locus of the rotor 52 is defined by these eccentric wheels 55a and the respective gears 52a and 53a. Planetary rotation movement. That is, the rotor 52 rotates around the eccentric ring 55a of the eccentric shaft 55 while sliding the apex seals 57 provided on the three tops 56 of the outer periphery on the trochoid inner peripheral surface 54a, and the eccentric shaft It revolves around 55 axes.

  Three respective working chambers 58 around the rotor 52 are respectively formed between the respective tops 56. Each working chamber 58 moves in the circumferential direction by rolling of the rotor 52 in the housing 51, and four strokes of intake, compression, combustion, and exhaust are performed with a predetermined phase difference, and the pressure by the combustion Rotates the eccentric shaft 55 via the rotor 52.

  An intake port and an exhaust port are formed in one side housing 53. Each port opens at a predetermined position in the housing 51, and performs intake and exhaust of exhaust gas to the working chamber 58. The housing 51 is provided with a spark plug for igniting the mixture in the working chamber 58.

  The apex seal 57 extends in the width direction of the rotor 52 so as to prevent blowout from the working chamber 58 of gas that has become high pressure due to combustion. Arc-shaped side seals 59 are provided on both sides of the rotor 52 so as to connect the adjacent tops 56. The side seals 59 seal the gap between the outer peripheral surface of the rotor 52 and the side housing 53. Also, the top 56 of the rotor 52 is provided with a corner seal 60 that couples the side seals 59 together. The corner seal 60 is formed in a substantially cylindrical shape that opens to the side housing 53 side.

  The eccentric shaft 55 is formed with an oil passage 61 to which rotor cooling oil is supplied from an oil pump (not shown). The rotor cooling oil in the oil passage 61 is sent to the internal space 62 of the rotor 52 by the centrifugal force caused by the rotation of the eccentric shaft 55.

  The rotor cooling oil sent to the internal space 62 takes heat from the inner wall surface while swirling in the internal space 62 due to the change of the inertial force received by the planetary rotation of the rotor 52. The rotor cooling oil in the internal space 62 cools the rotor 52 and then acts as a centripetal force toward the center of the rotor 52 to form a shaft through hole 63 formed in the rotor 52 and a shaft formed in the side housing 53 It passes through the through hole 64 and is discharged to an oil ring flow passage (not shown). The rotor cooling oil fed from the shaft through hole 63 of the rotor 52 to the shaft through hole 64 of the side housing 53 passes through the gap between the side portion of the rotor 52 and the inner surface of the side housing 53 and reaches the side seal 59 and the corner seal 60. It is sealed by the oil seal members 3 and 3 so as not to occur.

  The oil seal members 3, 3 are held in the ring-shaped outer seal groove 4 and the inner seal groove 5 provided in the rotor 52. These oil seal members 3 and 3 are respectively constituted by elastic oil seal rings 1 and 2 and hard oil seal rings 6 and 6.

  The hard oil seal rings 6, 6 are formed in a ring shape by a hard material such as a metal or a carbon material, and are held in the outer and inner seal grooves 4, 5. Between the bottoms of the outer and inner seal grooves 4, 5 and the hard oil seal rings 6, 6, push springs 7, 7 are arranged. The hard oil seal rings 6, 6 are urged in the direction of coming out of the outer and inner seal grooves 4, 5 by the push springs 7, 7, and the side surface portions (seal surfaces) 6a, 6a are pressed against the side housing 53. Oil is lubricated between the side portions 6 a and 6 a and the side housing 53 to such an extent that good lubricity can be maintained. Good lubricity means that an oil (oil film) is present between the side portions 6a, 6a and the side housing 53 to such an extent that they can slide smoothly, and the oil amount thereof is the side seal 59. A state where it is suppressed to such an extent that it does not enter into the combustion chamber over.

  FIG. 4 is a cross-sectional perspective view showing the hard oil seal ring in the use state shown in FIG.

  The hard oil seal ring 6 held in the outer seal groove 4 has an annular groove 6b in the inner peripheral surface as shown in FIG. Further, the hard oil seal ring 6 held in the inner seal groove 5 has an annular groove 6 b in the outer peripheral surface portion. Elastic oil seal rings 1 and 2 are disposed in the annular grooves 6b and 6b, respectively.

  The elastic oil seal rings 1 and 2 are formed of an elastic material such as fluorine rubber (FKM), and are disposed in the annular grooves 6b and 6b of the hard oil seal rings 6 and 6, respectively. It is held in five.

  FIG. 5 is a cross-sectional view of the elastic oil seal ring (outside) shown in FIG. 6 is a cross-sectional view of the elastic oil seal ring (inner side) shown in FIG.

  The elastic oil seal rings 1 and 2 are, as shown in FIGS. 5 and 6, respectively, at least three ridges 11, 12, 13, 21 and 22 projecting toward both side faces of the seal grooves 4 and 5, respectively. , 23 have. The elastic oil seal rings 1 and 2 in this embodiment are generally pentagonal (home base type) in cross-sectional shape.

  In addition, the elastic oil seal rings 1 and 2 cause at least one of the ridges 11 and 21 to protrude toward one side surface of each of the seal grooves 4 and 5, and the other at least two ridges 12 , 22 and 23 project toward the other side of the seal grooves 4 and 5.

  The outer elastic oil seal ring 1 in this embodiment causes one protrusion 11 to protrude toward the inner side surface of the outer seal groove 4 and the other two protrusions 12 and 13 are outer seals It projects toward the outer side surface of the groove 4. Further, the elastic oil seal ring 2 on the inner side makes one protrusion 21 project toward the outer side of the inner seal groove 5, and the other two protrusions 22 and 23 form the inner seal groove 5. It projects towards the inner side of the.

  The elastic oil seal rings 1 and 2 may be provided with four ridges, and the cross-sectional shape may be substantially square (rectangular), or five or more ridges may be provided.

  The outer elastic oil seal ring 1 in the present embodiment brings one protrusion 11 into contact with the inner side surface of the outer seal groove 4 and the other two protrusions 12 and 13 with hard oil seal It is in contact with the bottom of the annular groove 6 b of the ring 6. Further, the elastic oil seal ring 2 on the inner side brings one protrusion 21 into contact with the outer side surface of the inner seal groove 5 and the other two protrusions 22 and 23 to the hard oil seal ring 6 The bottom of the annular groove 6b of the

  The elastic oil seal ring 2 in the inner seal groove 5 seals the oil leaking from the gap between the hard oil seal ring 6 and the rotor 52. The elastic oil seal ring 1 in the outer seal groove 4 is a portion of the oil that can not be stopped by the hard oil seal ring 6 held in the inner seal groove 5, the hard oil seal ring 6 held in the outer seal groove 4 and the outer seal Seal with the side of the groove 4.

  In the oil seal members 3, 3, the elastic oil seal rings 1, 2 contact the ridges 11, 12, 13, 21, 22, 23 with the side portions of the seal grooves 4, 5 and the hard oil seal ring 6. Since the contact pressure is high because the contact area is small and the contact area is narrow, no positional deviation occurs on the side surface (seal surface) 6 a side in the annular groove 6 b of the hard oil seal ring 6. Further, the elastic oil seal rings 1 and 2 are not mounted in the annular groove 6b in a twisted state because the protruding portions 11, 12, 13, 21, 22, 23 are provided. .

  The elastic oil seal rings 1 and 2 do not interfere (contact) with the hard oil seal ring 6 because such positional deviation and twisting do not occur. Therefore, since the flatness of the side surface portion 6a is not deteriorated, stable lubricity with the side housing 53 is maintained.

  In addition, elastic oil seal rings 1 and 2 are not limited to the above-mentioned embodiment, but arrange elastic oil seal ring 1 which has one projected rim part 11 in inner skin in inner seal groove 5, and an outer peripheral surface The elastic oil seal ring 2 having one protrusion 21 may be disposed in the outer seal groove 4.

  FIG. 7 is a cross-sectional view of the elastic oil seal ring in the use state shown in FIG. 1 and is a case where the amount of crushing is small (a) and a case where the amount of crushing is large (b).

  In the oil seal members 3, 3, the elastic oil seal rings 1, 2 contact the ridges 11, 12, 13, 21, 22, 23 with the side portions of the seal grooves 4, 5 and the hard oil seal ring 6. Since the contact pressure is high because the contact area is small and the contact area is narrow, there is no interference with the hard oil seal ring 6 of the elastic oil seal ring 1 regardless of the size of the crushing margin.

  FIG. 8 is an enlarged sectional view showing a state of use of the elastic oil seal ring according to another embodiment of the present invention in a rotary piston engine.

  The elastic oil seal rings 1 and 2 can be provided with protrusions 14, 15, 24 and 25 on the side faces of the hard oil seal ring 6 opposite to the side faces of the annular groove 6 b as shown in FIG. 8. In this case, the positional deviation of the elastic oil seal rings 1 and 2 at the time of mounting can be regulated by the protrusions 14, 15, 24 and 25 of the side surface portions. However, it is preferable that the ridges 14, 15, 24, 25 of the side surface portion be formed so as not to press the side surface of the annular groove 6b. This is because when the ridges 14, 15, 24, 25 press the side surface of the annular groove 6b, there is a possibility that the flatness of the side surface portion (seal surface) 6a is deteriorated.

1 elastic oil seal ring 2 elastic oil seal ring 3 oil seal member 4 outer seal groove 5 inner seal groove 6 hard oil seal ring 6a side surface (seal surface)
6b Annular groove 7 Push spring 11 Protrusion 12 Protrusion 13 Protrusion 14 Protrusion 15 Protrusion 21 Protrusion 21 Protrusion 22 Protrusion 23 Protrusion 24 Protrusion 25 Protrusion 50 Rotary piston engine 51 Housing 52 Rotor 52a Internal Gear 52b Outer Side 53 Side Housing 53a Fixed Gear 54 Main Housing 54a Trochoid Inner Peripheral 55 Eccentric Shaft 55a Eccentric Wheel 56 Top 57 Apex Seal 58 Working Chamber 59 Side Seal 60 Corner Seal 61 Oil Passage 62 Internal Space 63 shaft through hole 64 shaft through hole

Claims (2)

An elastic oil seal ring held in a ring-shaped seal groove provided on a rotor rolling in a housing, comprising:
At least three projecting ridges projecting toward both side faces of the sealing groove, and at least one projecting ridge projecting toward one side face of the sealing groove; An elastic oil seal ring characterized in that a projection is made to project toward the other side of the seal groove. A hard oil seal ring for sealing the gap between the outer surface of the rotor and the inner surface of the housing is held in the seal groove,
The at least one protrusion is brought into contact with one side surface of the seal groove, and the other at least one protrusion is brought into contact with the hard oil seal ring. Elastic oil seal ring.

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