JP2004036711A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device 1 for a rotary engine capable of preventing a twist and a cut from occurring on a seal ring 5 without impairing the assemblage of the seal ring 5 and follow-up capability of a metal ring oil seal 2 in the sealing device 1 installed in the rotor 11 of the rotary engine and sealing a clearance between the rotor 11 and a side housing 13. <P>SOLUTION: This sealing device comprises the metal ring oil seal 2 installed in an installation groove 12 provided in the rotor 11 and fitted closely to the side housing 13, a spring means 3 pressing the metal ring oil seal 2 against the side housing 13, and the seal ring 5 of a rubber-like elastic material installed in the groove provided in the side face of the metal ring oil seal 2 and fitted closely to the rotor 11. The cross sectional shape of the seal ring 5 is formed such that the side of the groove 4 seated on a groove bottom part is formed in a rectangular shape in cross section along a groove shape and formed so as to provide a flat seating surface 5c. The side thereof in close-contact with the rotor 11 is formed in an arc shape in cross section mainly by an O-ring. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sealing device, and more particularly, to a sealing device that is mounted on a rotor in a rotary engine and seals between the rotor and a side housing.
[0002]
[Prior art]
Conventionally, in rotary engines, a sealing device has been used to prevent engine oil from leaking from between the rotor and the side housing, and the conventional sealing device is mounted in a mounting groove provided in the rotor as a main sealing part. It has a metal ring oil seal that is in close contact with the surface of the side housing. Further, a plate spring is provided which presses the metal ring oil seal against the side housing so that the metal ring oil seal follows the surface of the side housing when the processing accuracy of the surface of the side housing is not so good. In order to prevent oil from leaking between the seal and the rotor, an O-ring made of a rubber-like elastic material is provided which is mounted in a groove provided on the side surface of the metal ring oil seal and is in close contact with the inner surface of the mounting groove of the rotor.
[0003]
In the above conventional sealing device, the O-ring should be fixedly installed in a groove provided on the side surface of the metal ring oil seal, but actually, the O-ring is also rotated by the rotation movement. As a result, a circumferential tensile load acts on the O-ring. In addition, the metal ring oil seal reciprocates in the axial direction due to the vibration of the engine and the follow-up of the side housing. At this time, a torsional load is applied to the O-ring due to its circular cross-sectional shape. When the O-ring is twisted, the tensile strength tends to decrease extremely.
[0004]
The O-ring may be cut in the conventional sealing device due to the pulling and torsion, and the recent increase in the rotation speed of the rotor, and therefore, there is a disadvantage that the sealing performance is reduced due to this.
[0005]
In order to prevent the O-ring from being twisted, it is conceivable to change the cross-sectional shape from a circle to an X-shape or a rectangle. However, a seal ring (X-ring) having an X-shaped cross-section has a plurality of lips. The seal ring (square ring) having a rectangular cross section has a large contact area with the rotor and a large frictional resistance. However, there is an inconvenience that the followability to the side housing is deteriorated.
[0006]
[Problems to be solved by the invention]
In view of the above, the present invention provides a seal for a rotary engine that can prevent the seal ring from being twisted or cut without impairing the workability of assembling the seal ring and the followability of the metal ring oil seal. It is intended to provide a device.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a sealing device according to claim 1 of the present invention is a sealing device that is mounted on a rotor in a rotary engine and seals between the rotor and a side housing. A metal ring oil seal that is in close contact with the side housing; a spring means for pressing the metal ring oil seal against the side housing; and a rubber that is mounted in a groove provided in a side surface of the metal ring oil seal and is in close contact with the rotor. A sealing ring made of a resilient material, wherein the cross-sectional shape of the seal ring is such that the side seated on the groove bottom of the groove has a rectangular or substantially rectangular cross-section along the groove shape and a flat seating surface. Wherein the side close to the rotor has an arc shape or a substantially arc shape in cross section based on an O-ring. A.
[0008]
According to a second aspect of the present invention, there is provided the sealing device according to the first aspect, wherein a projection-like enlarged portion for enlarging the seating width of the flat seating surface is provided on a side surface of the seal ring. It is a feature.
[0009]
According to a third aspect of the present invention, there is provided the sealing device according to the first or second aspect, wherein a groove-shaped concave portion for reducing an insertion load of the seal ring is provided on a seating surface of the seal ring. It is characterized by the following.
[0010]
In the sealing device according to the first aspect of the present invention having the above-described structure, the cross-sectional shape of the seal ring is rectangular or substantially rectangular along the groove shape on the side that is seated on the groove bottom of the groove, and the seat is flat. Because of the shape having the surface, the seating posture of the seal ring can be stabilized, and the seal ring can be prevented from being twisted.
[0011]
On the other hand, the cross-sectional shape of the seal ring on the side that is in close contact with the rotor has an arc-shaped or substantially arc-shaped cross-section based on the O-ring. It is possible to prevent the resistance from increasing.
[0012]
In addition to this, in the sealing device according to the second aspect of the present invention having the above-described configuration, since the projection-like enlarged portion that enlarges the seating width of the flat seating surface is provided on the side surface of the seal ring. In addition, the seating posture of the seal ring is further stabilized, which is effective in preventing torsion. In addition, even when the width of the groove in which the seal ring is mounted is relatively wide, the width of the side of the seal ring in close contact with the rotor is relatively narrow. Since the setting can be performed, it is possible to suppress an increase in the contact area of the seal ring with the rotor and an increase in the frictional resistance.
[0013]
Further, in the sealing device according to the third aspect of the present invention having the above-described configuration, since the groove-shaped concave portion for reducing the insertion load of the seal ring is provided on the seating surface of the seal ring, the seal ring is mounted when the seal ring is mounted. It becomes easy to be elastically deformed, so that it becomes easy to mount the seal ring in the groove.
[0014]
The present application includes the following technical matters.
[0015]
That is, in order to achieve the above object (improvement of high load durability, etc.), one sealing device proposed by the present application has the following contents.
[0016]
(1) The sealing device is a sealing device having a seal combined with a metal ring oil seal (O / S) mounted on a rotor of a rotary engine.
{Circle around (2)} The sealing device has a half cross-section (semicircle) of the O-ring on the sealing surface side and a groove-shaped half on the non-sealing side based on the O-ring having an appropriate sealing function. This is a sealing device having a ring-shaped seal (made of rubber) used as a seal of a rotary engine having a rectangular shape along the axis.
{Circle around (3)} The sealing device is a sealing device having a seal ring having a D-shaped cross section and a sealing device having a seal ring having a T-shaped cross section (when the groove width is wide).
{Circle around (4)} In the above embodiments {circle around (2)} and {circle around (3)}, an O-ring made of a single rubber material suitable for the purpose is set (virtually) to have an optimum O-ring from the sealing function, and the cross-sectional shape is set based on this The seal (moving) side has the O-ring semicircle as it is, and the other half of the non-sealing (non-moving) side has a rectangular shape along the groove shape, for example, a D-shaped cross section. When the groove width is wide, the D-shaped section increases the friction, and the followability of the metal ring oil seal to the housing deteriorates.
(5) According to the above (2) to (4), the seal has the same sealing function and friction characteristics as the O-ring, does not twist, and has a large cross-sectional shape, so that the overall strength increases. , The cutting drag increases.
[0017]
{Circle around (6)} In the sealing device, the sealing surface side has a half cross-section (semicircle) of the O-ring, and the other half of the non-sealing side has a groove shape, based on the O-ring having an appropriate sealing function. A ring-shaped seal (made of rubber) used as a seal for a rotary engine that has a shape that reduces the load on the seal surface (reduces the insertion load) by providing a rectangular notch along the triangle and providing a triangular notch on the non-seal side. It is a sealing device which has.
{Circle around (7)} In the embodiment of the above paragraph {circle around (6)}, a single rubber material suitable for the application is used, and an optimal O-ring is set (virtual) from the sealing function, and based on this, the cross-sectional shape is changed to a seal (movement). On the side, the O-ring semicircle is left as it is, and the other half on the non-seal (non-moving) side is rectangular along the groove shape and is provided with notches.
(8) According to the configuration of (7), the seal has the same sealing function and friction characteristics as those of the O-ring, does not twist, and has a large cross-sectional shape. growing. In addition, the notch facilitates elastic deformation and reduces the insertion load.
[0018]
{Circle around (9)} D-rings and T-rings have been used in the past, but they have never been used where the torsion and tension act simultaneously on the seal ring. According to the present invention, it is possible to solve not only the problem of preventing twisting but also the problem unique to a rotary engine, such as prevention of cutting due to twisting and pulling.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 shows a rotor 11 in a rotary engine to which a sealing device according to an embodiment of the present invention is mounted, and an annular mounting groove 12 is provided in an end face portion 11a of the rotor 11. The sealing device according to the present embodiment is mounted in the mounting groove 12 to seal between the end face portion 11a of the rotor 11 and the surface 13a of the side housing 13 (see FIG. 2 or 3) opposed thereto. . Reference numeral 14 denotes an eccentric shaft (output shaft).
[0021]
First embodiment ...
FIG. 2 shows a cross section of the sealing device 1 according to the first embodiment of the present invention, and the sealing device 1 is configured as follows.
[0022]
That is, first, a metal ring oil seal (also referred to as a metal oil seal) 2 that is mounted in the mounting groove 12 of the rotor 11 and slidably contacts the surface 13a of the side housing 13 is provided. A leaf spring 3 is provided on the groove bottom side of the seal 2 as a spring means for pressing the metal ring oil seal 2 in one axial direction (upward in the drawing) to elastically press the metal ring oil seal 2 against the surface 13 a of the side housing 13. . An annular groove 4 is provided on a side surface and an inner peripheral surface of the metal ring oil seal 2, and the groove 4 is slidably contacted with the inner surface 12a of the mounting groove 12 of the rotor 11 so as to be slidable. A seal ring 5 made of a rubber-like elastic material for sealing between the oil seal 2 and the rotor 11 is provided.
[0023]
The metal ring oil seal 2 is formed by integrally molding an annular seal lip 2b slidably in close contact with the surface 13a of the side housing 13 at one end of the annular body 2a. The groove 4 for mounting the seal ring 5 is formed on the inner peripheral surface. The leaf spring 3 is formed by waving an annular flat plate.
[0024]
The seal ring 5 is formed by integrally molding a sliding portion 5b slidably in close contact with the inner surface 12a of the mounting groove 12 of the rotor 11 on a seating portion 5a seated on the groove bottom of the groove 4. The cross-sectional shape of the seating portion 5a is rectangular or substantially rectangular along the groove shape and has a flat seating surface 5c, and the cross-sectional shape of the latter sliding portion 5b is an O-ring. The cross-sectional shape is an arc shape (semicircle) or a substantially arc shape (substantially semicircle) based on the above. The seating surface 5c is formed on the outer peripheral surface of the seal ring 5 as a cylindrical surface.
[0025]
The sealing device 1 having the above structure seals the lubricating oil in the engine so as not to leak in the direction of the arrow in the figure through the gap between the rotor 11 and the side housing 12. It is characterized in that it has an operational effect.
[0026]
That is, regarding the cross-sectional shape of the seal ring 5, the cross-sectional shape of the seat portion 5a is rectangular or substantially rectangular in cross section along the groove shape and has a flat seating surface 5c. Even when the metal ring oil seal 2 reciprocates in the axial direction to follow the side housing 13 or the side housing 13, the seating posture of the seal ring 5 is stabilized, and the seal ring 5 is twisted like a conventional O-ring. There is no. Therefore, it is possible to prevent the seal ring 5 from being cut by the combined action of the pulling and the twisting, and it is possible to improve the sealing performance.
[0027]
On the other hand, since the cross-sectional shape of the sliding portion 5b in the seal ring 5 is an arc-shaped cross section or a substantially arc-shaped cross section based on an O-ring, the contact area with the rotor 11 as in a conventional square ring is reduced. It does not increase and the frictional resistance does not increase. Therefore, the followability of the metal ring oil seal 2 to the side housing 13 due to the elastic bias of the leaf spring 3 can be prevented from being deteriorated, and the sealing performance can be improved.
[0028]
Further, since the cross-sectional shape of the seal ring 5 integrally including the seating portion 5a and the sliding portion 5b has a squeezed shape without a lip due to the above-described configuration, assembling work of the seal ring 5 like a conventional X-ring. It is possible to prevent the property from deteriorating.
[0029]
The configuration of the sealing device 1 having the above configuration can be added or changed as follows.
[0030]
Second embodiment ...
As shown in FIGS. 3 and 4, on the side surface (axial end surface) of the seal ring 5, a protruding enlarged portion 5 d for increasing the seating width (axial width) of the seating surface 5 c is provided. In the figure, an annular protruding enlarged portion 5d is integrally formed on each of both side surfaces of the seal ring 5, thereby increasing the seating width of the seating surface 5c.
[0031]
When the enlarged portion 5d for enlarging the seating width of the seating surface 5c is provided on the side surface of the seal ring 5 as described above, since the seating posture of the seal ring 5 is further stabilized, twisting of the seal ring 5 is prevented. It can be prevented more effectively. Further, even when the width (axial width) of the groove 4 for mounting the seal ring 5 is relatively wide, the width (axial width) of the sliding portion 5b of the seal ring 5 can be set relatively small. Therefore, from this point as well, it is possible to suppress an increase in the contact area of the seal ring 5 with the rotor 11 and an increase in frictional resistance.
[0032]
In FIG. 4, the height of the seal ring 5 in the free state is x, the height of the enlarged portion 5d is y, the width of the seal ring 5 is z, the depth of the groove 4 in the assembled state is A, Let B be the width of
x = 1.2A
y = 0.5x
z = 0.9B
B @ 2A
Are set to satisfy the respective conditions. In FIG. 4, the center of the ring diameter may be any of the upper, lower, left and right.
[0033]
Third embodiment ...
As shown in FIG. 5, on the side surface (axial end surface) of the seal ring 5, a protruding enlarged portion 5 d for enlarging the seating width (axial width) of the seating surface 5 c is provided. A groove-shaped recess 5e for reducing the insertion load of the seal ring 5 is provided. In the figure, an annular protruding enlarged portion 5d is formed integrally on both side surfaces of the seal ring 5 to increase the seating width of the seating surface 5c, and the concave portion 5e is formed as a triangular or substantially triangular cross section. Have been.
[0034]
When the enlarged portion 5d for enlarging the seating width of the seating surface 5c is provided on the side surface of the seal ring 5 as described above, since the seating posture of the seal ring 5 is further stabilized, twisting of the seal ring 5 is prevented. Even if the width (axial width) of the groove 4 for mounting the seal ring 5 is relatively large, the width (axial width) of the sliding portion 5b of the seal ring 5 can be reduced. Since it is possible to set a relatively small value, it is possible to suppress an increase in the contact area of the seal ring 5 with the rotor 11 and an increase in frictional resistance. In addition, the provision of the groove-shaped concave portion 5e for reducing the insertion load of the seal ring 5 on the seating surface 5c facilitates the elastic deformation of the seal ring 5, so that the insertion load of the seal ring 5 can be reduced. Therefore, the assembling workability can be improved. It is desirable that the width (axial direction width) of the concave portion 5e is equal to or larger than the width of the sliding portion 5b. In addition, the seal ring 5 in FIG. 5 can be said to have a pair of seating legs 5g provided on a seal ring main body 5f having a circular section in view of its shape.
[0035]
【The invention's effect】
The present invention has the following effects.
[0036]
That is, in the sealing device according to the first aspect of the present invention having the above configuration, the cross-sectional shape of the seal ring is rectangular or substantially rectangular along the groove shape on the side that is seated on the groove bottom of the groove, and is flat. Since it has a shape having a suitable seating surface, the seating posture of the seal ring can be stabilized, and the seal ring can be prevented from being twisted like a conventional O-ring. Therefore, it is possible to prevent the seal ring from being cut due to the combined action of the pulling and the twisting, thereby improving the sealing performance.
[0037]
On the other hand, on the side where the cross-sectional shape of the seal ring is in close contact with the rotor, the cross-sectional shape or the substantially circular shape is based on the O-ring. It is possible to prevent the friction resistance from increasing due to the increase. Therefore, it is possible to prevent the followability of the metal ring oil seal to the side housing from being deteriorated by the spring means, thereby improving the sealability.
[0038]
In addition, since the seal ring has a squeezed cross-sectional shape having no lip due to the above-described configuration, it is possible to prevent deterioration in workability of assembling the seal ring as in the conventional X-ring. .
[0039]
In addition to this, in the sealing device according to the second aspect of the present invention having the above configuration, a protruding enlarged portion for enlarging the seating width of the flat seating surface is provided on the side surface of the seal ring. Therefore, the seating posture of the seal ring can be further stabilized, and the occurrence of twist in the seal ring can be more effectively prevented. Further, even when the width of the groove in which the seal ring is mounted is relatively wide, the width of the seal ring on the side close to the rotor can be set relatively narrow. An increase in the contact area and an increase in frictional resistance can be suppressed.
[0040]
Further, in the sealing device according to the third aspect of the present invention having the above configuration, since the groove-shaped concave portion for reducing the insertion load of the seal ring is provided on the seating surface of the seal ring, It becomes easy to elastically deform at the time of mounting, and it becomes easy to mount the seal ring in the groove. Therefore, the workability of assembling the seal ring can be improved.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a rotor on which a sealing device according to an embodiment of the present invention is mounted. FIG. 2 is a half sectional view of a sealing device according to a first embodiment of the present invention. FIG. 3 is a second embodiment of the present invention. FIG. 4 is an enlarged cross-sectional view (end view) of a seal ring in the sealing device according to the first embodiment.
FIG. 5 is a sectional view (end view) of a seal ring in a sealing device according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sealing device 2 Metal ring oil seal 2a Annular main body 2b Seal lip 3 Leaf spring (spring means)
4 Groove 5 Seal ring 5a Seating portion 5b Sliding portion 5c Seating surface 5d Enlarged portion 5e Recess 5f Seal ring body 5g Seating leg 11 Rotor 11a End surface 12 Mounting groove 12a Inner surface 13 Side housing 13a Surface 14 Eccentric shaft

Claims (3)

In a sealing device (1) mounted on a rotor (11) of a rotary engine to seal between the rotor (11) and a side housing (13),
A metal ring oil seal (2) mounted in a mounting groove (12) provided in the rotor (11) and in close contact with the side housing (13); and a metal ring oil seal (2) mounted on the side housing (13). And a seal ring (5) made of a rubber-like elastic material, which is mounted in a groove (4) provided on a side surface of the metal ring oil seal (2) and is in close contact with the rotor (11). Has,
The cross-sectional shape of the seal ring (5) is such that the side of the groove (4) that is seated at the bottom of the groove has a rectangular or substantially rectangular cross section along the shape of the groove (4) and is a flat seating surface (5c). Wherein the side close to the rotor (11) has an arc-shaped cross section or a substantially arc shape based on an O-ring. The sealing device according to claim 1,
A sealing device characterized in that a protruding enlarged portion (5d) for enlarging a seating width of a flat seating surface (5c) is provided on a side surface of a seal ring (5). The sealing device according to claim 1 or 2,
A sealing device, characterized in that a groove-shaped recess (5e) for reducing the insertion load of the seal ring (5) is provided on a seating surface (5c) of the seal ring (5).

Images