JP2020186778A - Sealing device - Google Patents

Abstract

To prevent leakage of a sealed fluid and removal of a sealing device even if deformation occurs in a resin component due to heat.SOLUTION: A sealing device 101 opens on one surface side attached to a crank case 11 and is housed and held in a resin housing 51 having a flange 53 on an inner peripheral surface through which a crank shaft 31 penetrates. An annular base 111, having a back side end surface 112 butted with the flange 53 and a front side end surface 113 butted with the crank case 11, housed in the housing 51, and made of a resin, forms a base of the sealing device 101. The annular base 111 has a shaft hole 114 through which the crank shaft 31 penetrates and includes a seal lip 132 which contacts with the crank shaft 31. A gap between the housing 51 and the annular base 111 is sealed by a seal 151, which fits in an annular groove 152 provided on an outer peripheral surface of the annular base 111, for example, an O ring.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sealing device.

In fields such as automobiles and general-purpose machines, sealing devices are used to seal the fluid in the machine.

For example, Patent Document 1 describes an oil seal provided in an opening for inserting a pipe for mounting a spark plug of a rocker cover. Patent Documents 2 and 3 describe an oil seal that comes into contact with the crankshaft of an engine.

Patent Document 1 discloses a configuration example in which a baffle plate is welded to the lower surface of a rocker cover and an oil seal is arranged between the rocker cover and the baffle plate (paragraphs [0008] to [0010] of Document 1). (See FIG. 1). An oil seal support is welded to the outer periphery of the oil seal, and the oil support is fitted and supported between the rocker cover and the baffle plate. The oil support is welded to the baffle plate.

Patent Document 2 discloses a configuration example in which an oil seal is provided in an opening for a crankshaft (a hole 12 for a crankshaft) provided in an engine cover, and the oil seal is brought into contact with a clan shaft penetrating the opening (Reference). See paragraphs 2 [0009] to [0015]).

Patent Document 3 discloses a configuration example in which an oil seal is provided in an opening (through hole 22) provided in a timing chain cover and the oil seal is brought into contact with a crankshaft penetrating the opening (paragraph [0029] of Document 3]. ] [0033] to [0036]).

The rocker cover of Patent Document 1, the engine cover of Patent Document 2, and the timing chain cover of Patent Document 3 all form a part of the housing. The "member penetrating the opening" is a pipe for mounting a spark plug in Patent Document 1, and a crankshaft in Patent Documents 2 and 3.

Japanese Unexamined Patent Publication No. 06-034153 Japanese Unexamined Patent Publication No. 07-055015 Japanese Unexamined Patent Publication No. 2015-121300

In the field of automobiles, weight reduction has always been an issue. Especially in recent years, the demand for energy saving has increased against the background of global energy problems, and weight reduction has become even more important. A commonly used method for weight reduction is a review of materials.

For example, in the configuration example of Patent Document 1, synthetic resin is used as a material for the rocker cover, the oil seal support, and the baffle plate (see paragraph [0008] of Document 1). In the configuration example of Patent Document 2, the engine cover is manufactured of molded plastic (see paragraph [0009] of Document 2). In the configuration example of Patent Document 3, the timing chain cover is composed of polyamide as a resin material (see paragraph [0029] of Document 3). In this way, in the configuration examples shown in Patent Documents 1 to 3, resin parts are used as a part of the housing and the sealing device to reduce the weight.

Resin has a larger dimensional change due to thermal expansion than metal, and is easily deformed by heat. The higher the temperature, the easier the creep deformation will progress. Therefore, when using resin parts for the sealing device and its housing, it is necessary to consider deformation due to heat. This is because when deformed by heat, the close force between the sealing device and the opening for accommodating the sealing device is reduced, causing leakage of the sealing fluid and, in some cases, disconnection of the sealing device. ..

It is possible to solve the disconnection of the sealing device by using a retaining structure. Patent Documents 1 to 3 also employ a retaining structure for a sealing device. However, the retaining structure increases the number of parts and causes the structure to become complicated. This raises new issues such as rising parts costs and manufacturing costs, and increasing assembly man-hours. Improvement is required.

An object of the present invention is to prevent the sealing fluid from leaking or the sealing device from coming off due to a simple structure even if the resin component is deformed by heat.

One aspect of the sealing device of the present invention is a resin ring having an abutting portion against a mating member on one end surface in the axial direction and an end surface on the opposite side in the axial direction, and having a shaft hole penetrating in the axial direction in the central portion. A base, an annular seal lip fixed to the annular base and protruding inward of the shaft hole, an annular seal arranged on the outer peripheral surface of the annular base, and an annular seal provided on the annular base to provide the seal. It is equipped with a regulation unit that regulates the position in the axial direction.

Another aspect of the sealing device of the present invention is a back end surface which is housed in a resin housing having one side which is attached to the device side and has an opening, and which abuts on a flange provided on the inner peripheral surface of the housing, and the device side. A resin annular base having an end face on the front side that abuts against the device and a shaft hole that penetrates in the axial direction in the central portion, and a shaft that is fixed to the annular base and protrudes from the device and penetrates the shaft hole. An annular seal lip that comes into contact, an annular seal that is arranged on the outer peripheral surface of the annular base and is in close contact with the inner peripheral surface of the housing, and a regulating portion that is provided on the annular base and regulates the position of the seal in the axial direction. And.

Yet another aspect of the sealing device of the present invention is a resin housing having a flange on the inner peripheral surface having an opening on one side attached to the device side and penetrating a shaft protruding from the device side, and housing in the housing. A resin annular base having an end surface on the back side that abuts on the flange and an end surface on the front side that abuts on the device side and having a shaft hole penetrating the shaft in the central portion, and fixed to the annular base. An annular seal lip protruding from the device and contacting a shaft penetrating the shaft hole, an annular seal arranged on the outer peripheral surface of the annular base and in close contact with the inner peripheral surface of the housing, and the annular base. It is provided with a regulating unit that regulates the position of the seal in the axial direction.

According to the present invention, even if the resin component is deformed by heat, it is possible to prevent the sealing fluid from leaking or the sealing device from coming off by a simple structure.

As one embodiment, a horizontal cross-sectional view before assembly showing only half of the sealing device held in the housing cut on the axis of the crankshaft to illustrate how the sealing device is attached to the crankcase. A horizontal cross-sectional view showing only half of the sealing device cut on the axis of the crankshaft. As another example of implementation, a horizontal cross-sectional view showing only half of the sealing device cut on the axis of the crankshaft. As yet another example of implementation, a horizontal cross-sectional view showing only half of the sealing device cut on the axis of the crankshaft. As yet another example of implementation, a horizontal cross-sectional view showing only half of the sealing device cut on the axis of the crankshaft. As yet another example of implementation, a horizontal cross-sectional view showing only half of the sealing device cut on the axis of the crankshaft.

An embodiment will be described with reference to FIGS. 1 and 2. This embodiment shows an example of a sealing device provided in the crankcase of an engine and sealing a gap between the crankcase and the crankshaft. The crankcase is a member on the equipment side that forms a part of the engine, and the crankshaft is a shaft that protrudes from the equipment side.

As shown in FIG. 1, the crankcase 11 is provided with a shaft hole 12 (indicated by a dotted line), and a crankshaft 31 (indicated by a two-dot chain line) protrudes from the shaft hole 12 to the outside. A recess 13 is provided around the shaft hole 12, and the bottom portion of the recess 13 is a mounting surface 14. The mounting surface 14 is flat. The sealing device 101 is inserted into the recess 13 and attached to the mounting surface 14. The reference numeral C is the central axis of the shaft hole 12. The central axis C forms the axis of the crankshaft 31 and the sealing device 101.

The sealing device 101 is housed in the housing 51 and is attached to the crankcase 11 together with the housing 51. The sealing device 101 attached to the crankcase 11 seals the crankshaft 31. In the drawing, A is the outside of the aircraft and B is the inside of the aircraft.

The sealing device 101 of the present embodiment has two broad and narrow meanings from the viewpoint of whether or not the housing 51 is included. The sealing device 101 in the narrow sense does not include the housing 51. On the other hand, the sealing device 101 can be thought of as including the housing 51 because it is attached to the crankcase 11 while being housed in the housing 51. This is the sealing device 101 in a broad sense. In the present embodiment, the sealing device in the narrow sense is referred to as the sealing device 101, and the sealing device in the broad sense including the housing 51 is referred to as the sealing device 101A.

The housing 51 is made of resin and has a bottomless cup shape. More specifically, an opening 52 is provided on one side of the housing 51 attached to the crankcase 11, and a flange 53 is provided at a position opposite to the opening 52. The flange 53 extends inward from the inner peripheral surface of the housing 51 and opens the central portion of the housing 51. The cup shape described above is formed by the flange 53, and the opening in the central portion of the flange 53 gives the housing 51 a bottomless shape. In the present embodiment, the opening at the central portion of the flange 53 is referred to as the central hole 54.

The housing 51 is attached to the crankcase 11 with the opening 52 inserted into the recess 13 toward the mounting surface 14. The housing 51 is fixed to the crankcase 11 by a fastening means (not shown).

As shown in FIGS. 1 and 2, the sealing device 101 bridge-bonds the rubber-like elastic body 131 to the inner peripheral surface of the annular base 111. The rubber-like elastic body 131 integrally forms the seal lip 132 and the dust strip 141.

The annular base 111 is a cylindrical resin member. The resin material may be the same material as the housing 51 or a different material.

The annular base 111 includes one end face 112 and an end face 113 on the opposite side in the axial direction, and the shaft hole 114 is passed through the central portion. An abutting portion 115 that abuts the mating member is provided on one end surface 112 and the end surface 113 on the opposite side.

One end face 112 becomes a back end face located on the back side when the annular base 111 is housed in the housing 51. One end face 112 is flat and abuts on the flange 53 within the housing 51. At this time, the elastic member 161 described later, which is fixed to one end face 112, abuts. Therefore, of the one end surface 112, the portion fixing the elastic member 161 constitutes the abutting portion 115 that abuts on the flange 53 which is the mating member.

The end face 113 on the opposite side becomes the end face on the opposite side located on the front side when the annular base 111 is housed in the housing 51. The end surface 113 on the opposite side is also flat, and when the housing 51 accommodating the annular base 111 is attached to the crankcase 11, the entire surface of the housing 51 abuts against the mounting surface 14 in the recess 13 (see FIG. 2). Therefore, the entire surface of the end surface 113 on the opposite side constitutes an abutting portion 115 that abuts on the mounting surface 14 of the crankcase 11 which is a mating member.

The inner peripheral surface of the annular base 111 serving as the shaft hole 114 is stepped, and is divided into a small diameter portion 116a and a large diameter portion 116b. The small diameter portion 116a is an inner peripheral surface on the side close to one end surface 112 (the end surface on the back side) of the annular base 111. The large diameter portion 116b is an inner peripheral surface on the side close to the end surface 113 (the end surface on the front side) on the opposite side of the annular base 111. As can be seen from the name, the small diameter portion 116a has a smaller diameter than the large diameter portion 116b. The inner diameter of the small diameter portion 116a coincides with the inner diameter of the central hole 54 of the housing 51. The axial length of the large diameter portion 116b is longer than that of the small diameter portion 116a.

The step shape of the inner peripheral surface of the annular base 111 connects the small diameter portion 116a and the large diameter portion 116b in the direction of the central axis C of the sealing device 101, that is, in the direction orthogonal to the axial direction. In this embodiment, this surface is referred to as a step surface 117.

The rubber-like elastic body 131 is adhered to the inner peripheral surface of the annular base 111 so as to straddle the small diameter portion 116a and the step surface 117. The portion adhered to the small diameter portion 116a is relatively thick and is continuous with the seal lip 132 and the dust strip 141. The rubber-like elastic body 131 adhered to the step surface 117 is in the form of a film.

The seal lip 132 is an annular member provided on the B side of the machine with respect to the dust strip 141. The seal lip 132 is given a triangular cross-sectional shape with the lip end 135 at the top where the inner slope 133, which is the slope on the B side inside the machine, and the outer slope 134, which is the slope on the outside A side, intersect. The lip end 135 comes into contact with the crankshaft 31, defines a space on the B side inside the machine and a space on the A side outside the machine, and seals the two spaces.

The rubber-like elastic body 131 is provided with a mounting groove 136 having a semicircular cross section at a position corresponding to the back side of the lip end 135 of the seal lip 132. A garter spring 137 in which both ends of the coil spring are connected in an annular shape is fitted in the mounting groove 136. The garter spring 137 enhances the contact force of the lip end 135 of the seal lip 132 with respect to the crankshaft 31 by its tightening force.

The dust strip 141 is an annular member provided on the outside A side of the seal lip 132 and extending the lip end 142 diagonally toward the outside A side. The lip end 142 of the dust strip 141 is in contact with the crankshaft 31. The dust strip 141 prevents foreign matter such as sludge and dust from entering from the outside A side to the inside B side.

The sealing device 101 has a double sealing structure in order to prevent oil from leaking from between the housing 51 and the annular base 111.

The first seal structure is a seal 151 arranged on the outer peripheral surface of the annular base 111. In this embodiment, an O-ring is used as the seal 151. The annular base 111 is provided with an annular groove 152 on the outer peripheral surface as a regulating portion that regulates the axial position of the seal 151. The groove 152 is located near the center of the annular base 111 in the axial direction, and is provided over the entire circumference of the outer peripheral surface of the annular base 111.

The annular groove 152 has a shape that is recessed at a right angle from the outer peripheral surface of the annular base 111 and has a rectangular shape when cross-sectionald. The seal 151 fits into the groove 152, and a part of the seal 151 that does not fit in the groove 152 protrudes from the outer peripheral surface of the annular base 111. As shown in FIG. 2, this protruding portion is in close contact with the inner peripheral surface of the housing 51. As a result, the seal 151 seals the gap between the inner peripheral surface of the housing 51 and the outer peripheral surface of the annular base 111.

The second seal structure is the elastic member 161 described above. The elastic member 161 is an annular member made of an elastic material such as various synthetic rubbers, and is fixed to one end surface 112 of the annular base 111. When cross-sectioned, the elastic member 161 has a tapered trapezoidal shape, and when the annular base 111 is housed in the housing 51, the tip portion thereof abuts against the flange 53. Therefore, similarly to the end surface 113 on the opposite side, the elastic member 161 itself becomes the abutting portion 115 that abuts on the flange 53 which is the mating member.

As shown in FIG. 2, when the housing 51 for accommodating the sealing device 101 is attached to the crankcase 11, the shaft hole 114 of the annular base 111 and the center hole 54 of the housing 51 overlap each other and penetrate the crankshaft 31. At this time, the seal lip 132 and the dust strip 141 bring their lip ends 135 and 142 into contact with the crankshaft 31.

The action will be described.

In order to mount the sealing device 101A in a broad sense on the crankcase 11, the housing 51 and the sealing device 101 are attached to the crankcase 11 while the crankshaft 31 is passed through the shaft hole 114 of the annular base 111 and the center hole 54 of the housing 51. Install.

As an example of the mounting method, a method in which the sealing device 101 is stored in the housing 51 in advance to form the sealing device 101A and then mounted on the crankcase 11 in this state can be adopted. To execute this method, first, the sealing device 101 is inserted into the opening 52 of the housing 51 from the side of one end surface 112, and the sealing device 101 is incorporated into the housing 51. Then, the assembled sealing device 101A is inserted into the recess 13 of the crankcase 11 while passing the crankshaft 31 through the shaft hole 114 and the center hole 54. If the housing 51 is fixed to the crankcase 11 by a fastening means (not shown), the work of attaching the sealing device 101 is completed.

As another example of the mounting method, a method of mounting the annular base 111 and the housing 51 separately on the crankcase 11 may be adopted. To execute this method, first, the crankshaft 31 is passed through the shaft hole 114 with the opposite end surface 113 facing the mounting surface 14 of the crankcase 11, and the annular base 111 is attached to the crankshaft 31. Next, the crankshaft 31 is passed through the central hole 54 of the housing 51 with the opening 52 facing the crankcase 11, and the housing 51 is attached to the crankshaft 31. Then, the sealing device 101 is inserted into the opening 52 of the housing 51 from the side of one end surface 112, and the sealing device 101 is incorporated into the housing 51. The sealing device 101A assembled in this way is pushed in and inserted into the recess 13 of the crankcase 11. If the housing 51 is fixed to the crankcase 11 by a fastening means (not shown), the work of attaching the sealing device 101 is completed.

As yet another example of the mounting method, it is also feasible to mount the sealing device 101 on the crankcase 11 by one of the above two methods and mount the crankshaft 31 later.

Needless to say, various changes are allowed in each step of the above three methods.

When the sealing device 101A in a broad sense is attached to the crankcase 11, the sealing device 101 housed in the housing 51 is sandwiched between the mounting surface 14 of the crankcase 11 and the flange 53 of the housing 51. At this time, the elastic member 161 provided on one end surface 112 of the annular base 111 is crushed and elastically deformed, and is brought into close contact with the flange 53 by itself. Then, the elastic member 161 exerts an elastic restoring force and presses the opposite end surface 113 against the mounting surface 14.

The sealing device 101 sandwiched between the mounting surface 14 and the flange 53 brings the seal 151 provided on the outer peripheral surface of the annular base 111 into close contact with the inner peripheral surface of the housing 51. In this way, the sealing device 101 is positioned in the housing 51 in both the axial direction and the radial direction. As a result, the seal lip 132 and the dust strip 141 bring the lip ends 135 and 142 into contact with the crankshaft 31 without bias.

As a result of the lip end 135 of the seal lip 132 coming into contact with the crankshaft 31, oil leakage from the inside B to the outside A is prevented.

As a result of the lip end 142 of the dust strip 141 coming into contact with the crankshaft 31, foreign matter such as sludge and dust is prevented from entering from the outside A side to the inside B side.

When the sealing device 101A in a broad sense is attached to the crankcase 11, the end surface 113 on the opposite side, which is the abutting portion 115 of the annular base 111, is abutted against the mounting surface 14 of the crankcase 11. Since both the mounting surface 14 and the opposite end surface 113 are flat, the end surface 113 is in close contact with the mounting surface 14. The closeness of these two surfaces exerts a certain degree of regulatory power against oil leakage from the inside B of the crankcase 11 to the outside A.

On the other hand, the mounting surface 14 of the crankcase 11 and the end surface 113 on the opposite side of the sealing device 101 are merely in surface contact, and this alone cannot prevent oil leakage. In particular, in the present embodiment, resin is used for both the housing 51 constituting the sealing device 101A and the annular base 111 of the sealing device 101. Resin has a large dimensional change due to thermal expansion with respect to metal, and creep deformation is also large. When the engine warms up and the heat is conducted to the sealing device 101A, the housing 51 and the annular base 111 are deformed.

Therefore, the sealing device 101 or the sealing device 101A of the present embodiment is provided with a seal 151 and an elastic member 161 to prevent oil from leaking from the inside B of the crankcase 11 to the outside A. ..

The seal 151, which is an O-ring, passes between the mounting surface 14 of the crankcase 11 and the end surface 113 on the opposite side of the sealing device 101, and circulates through the gap between the housing 51 and the annular base 111 to the outside A. Seal the oil that is about to leak. As long as the seal 151 functions normally, only the seal 151 prevents oil leakage.

The elastic member 161 seals the oil that has passed through the seal 151 due to the impaired normal function of the seal 151. The sealing device 101 can more reliably prevent oil leakage due to the double sealing structure of the seal 151 and the elastic member 161.

At this time, in the present embodiment, resin is used for both the housing 51 and the annular base 111. Therefore, when the heat of the warmed engine is conducted, the housing 51 and the annular base 111 are deformed at the same ratio, and the gap size between the two is not significantly changed, although it depends on the relationship between the resin materials used. As a result, it is possible to more reliably prevent oil leakage due to the seal 151.

Moreover, since the sealing device 101 is reliably prevented from coming off by the flange 53 of the housing 51, it is possible to reliably prevent the sealing device 101 from falling off from the housing 51.

According to the present embodiment, in order to seal the oil in the crankcase 11 and prevent the sealing device 101 from falling off, a simple structure is adopted in which the cylindrical sealing device 101 is simply housed in the housing 51. There is. More specifically, simply by abutting one end surface 112 of the sealing device 101 against the flange 53 of the housing 51 via the elastic member 161 and abutting the opposite end surface 113 against the mounting surface 14 of the crankcase 11, the inside of the housing 51 The sealing device 101 is stored in the housing without falling off. Then, the oil leakage is prevented only by arranging the seal 151 on the outer peripheral surface of the annular base 111 and fixing the elastic member 161 to one end surface 112.

Therefore, according to the present embodiment, even if the housing 51, which is a resin component, or the annular base 111 of the sealing device 101 is deformed by heat, oil leakage or omission of the sealing device 101 is prevented by a simple structure with a small number of parts. It can be prevented from occurring.

According to the present embodiment, the following actions and effects are also obtained.

Since the seal 151 is an O-ring, oil leakage can be reliably prevented by widely used and easily available parts.

Since the regulating portion that regulates the position of the seal 151 in the axial direction is the annular groove 152, the structure can be further simplified.

Since the elastic member 161 is fixed to the abutting portion 115 of one end surface 112 of the annular base 111, a manufacturing error between the housing 51 and the annular base 111 is large, or one or both of them are deformed. Even so, the sealing device 101 can be reliably held in the housing 51. Moreover, since the elastic member 161 is annular, it can exert a sealing action.

Since the abutting portion 115 of the end surface 113 on the opposite side of the annular base 111 is flat, it can be brought into close contact with the mounting surface 14 of the crankcase 11 and the holding state of the sealing device 101 in the housing 51 can be stabilized.

Another embodiment will be described with reference to FIG. The same parts as those of the embodiments shown in FIGS. 1 and 2 are indicated by the same reference numerals, and description thereof will be omitted.

This embodiment is an example in which a square ring is provided instead of the O-ring as the seal 151 arranged on the outer peripheral surface of the annular base 111. The square ring is also common to the O-ring in that it is an annular seal 151. The difference from the O-ring is that the close force of the housing 51 with respect to the inner peripheral surface can be further strengthened. Adoption of a square ring is advantageous when it is necessary to increase the closeness of the housing 51 to the inner peripheral surface.

Yet another embodiment will be described with reference to FIG. The same parts as those of the embodiments shown in FIGS. 1 and 2 are indicated by the same reference numerals, and description thereof will be omitted.

This embodiment is an example in which a D ring is provided instead of the O ring as the seal 151 arranged on the outer peripheral surface of the annular base 111. The D-ring is also common to the O-ring and the square ring (see FIG. 3) in that it is an annular seal.

When a square ring is used as the seal 151, the close contact force with respect to the inner peripheral surface of the housing 51 can be increased, but when the sealing device 101 is housed in the housing 51, it is caught by the edge of the opening 52 of the housing 51, which reduces workability. It is expected to do. At this point, the D-ring can make it easier to store the sealing device 101 with respect to the housing 51 than with the square ring, while increasing the closeness to the inner peripheral surface of the housing 51 as compared with the O-ring.

Yet another embodiment will be described with reference to FIG. The same parts as those of the embodiments shown in FIGS. 1 and 2 are indicated by the same reference numerals, and description thereof will be omitted.

This embodiment is an example in which an X ring is provided instead of the O ring as the seal 151 arranged on the outer peripheral surface of the annular base 111. The X-ring is also common to the O-ring in that it is an annular seal.

The X ring used as the seal 151 has a shape in which the lip ends are arranged in two rows along the axial direction. The X-ring can increase the close contact area of the housing 51 with respect to the inner peripheral surface by the lip end of each row, and can improve the sealing property.

Yet another embodiment will be described with reference to FIG. The same parts as those of the embodiments shown in FIGS. 1 and 2 are indicated by the same reference numerals, and description thereof will be omitted.

The sealing device 101 or the sealing device 101A of the present embodiment is an example in which a plurality of seals 151 and elastic members 161 are provided. More specifically, three seals 151 are provided, and three grooves 152 are provided along the axial direction on the outer peripheral surface of the housing 51. A seal 151 is housed in each of the grooves 152. Further, three elastic members 161 having different diameters are fixed to one end surface 112 of the annular base 111.

In such a configuration, according to the sealing device 101 or the sealing device 101A of the present embodiment, since a plurality of seals 151 are provided, a more reliable seal leakage prevention function can be exhibited. Further, since the three elastic members 161 are provided, a stronger holding function of the sealing device 101 is exhibited between the flange 53 of the housing 51 and the mounting surface 14 of the crankcase 11. The three elastic members 161 also have an effect of reinforcing the seal leakage prevention function.

So far, four embodiments have been introduced. In carrying out these embodiments, various modifications and changes are possible.

For example, in each of the above embodiments, an example in which an annular member 161 exhibiting a sealing action is used as the elastic member 161 is shown, but a non-annular elastic member 161 may be used. Further, in the embodiment shown in FIG. 6, an example in which a plurality of elastic members 161 are provided is shown. In this configuration, a part of the elastic member 161 may be annular and the remaining part may be non-annular. The non-annular elastic member 161 can be deformed in any way, for example, a columnar shape or a tapered columnar shape.

In practice, any other transformation or change is possible.

11 Crankcase 12 Shaft hole 13 Depression 14 Mounting surface 31 Crankshaft 51 Housing 52 Opening 53 Flange 54 Center hole 101 Sealing device 101A Sealing device 111 Circular base 112 One end surface 113 Opposite end surface 114 Shaft hole 115 Butt portion 116a Small diameter Part 116b Large diameter part 117 Step surface 131 Rubber elastic body 132 Seal lip 133 Inner slope 134 Outer slope 135 Lip end 136 Mounting groove 137 Gata spring 141 Dustrip 142 Lip end 151 Seal 152 Groove 161 Elastic member A Outer machine B Inside C Central axis

Claims (11)

An annular base made of resin having an abutting portion against a mating member on one end surface on the axial direction and an end surface on the opposite side in the axial direction and having a shaft hole penetrating in the axial direction in the central portion.
An annular seal lip fixed to the annular base and protruding inward of the shaft hole,
An annular seal arranged on the outer peripheral surface of the annular base and
A regulating unit provided on the annular base and restricting the position of the seal in the axial direction,
A sealing device equipped with. The seal is an O-ring.
The sealing device according to claim 1. The regulating portion is an annular groove into which the seal is fitted.
The sealing device according to claim 1 or 2. An elastic member is fixed to the abutting portion of the one end face.
The sealing device according to claim 1. The elastic member is annular.
The sealing device according to claim 4. The abutting portion of the opposite end face is flat.
The sealing device according to claim 1. It is housed in a resin housing with one side that is attached to the device side and has an opening, and has an end surface on the back side that abuts on a flange provided on the inner peripheral surface of the housing and an end surface on the front side that abuts on the device side. An annular base made of resin with a shaft hole penetrating in the direction in the center,
An annular seal lip that is fixed to the annular base and that protrudes from the device and contacts the shaft that penetrates the shaft hole.
An annular seal arranged on the outer peripheral surface of the annular base and in close contact with the inner peripheral surface of the housing,
A regulating unit provided on the annular base and restricting the position of the seal in the axial direction,
A sealing device equipped with. An elastic member is fixed to the end face on the back side.
The sealing device according to claim 7. A resin housing with an opening on one side attached to the device side and a flange on the inner peripheral surface that penetrates the shaft protruding from the device side.
A resin annular base housed in the housing, having an end surface on the back side that abuts on the flange and an end surface on the front side that abuts on the device side, and having a shaft hole in the center portion through which the shaft is penetrated.
An annular seal lip that is fixed to the annular base and that protrudes from the device and contacts the shaft that penetrates the shaft hole.
An annular seal arranged on the outer peripheral surface of the annular base and in close contact with the inner peripheral surface of the housing,
A regulating unit provided on the annular base and restricting the position of the seal in the axial direction,
A sealing device equipped with. An elastic member is fixed to the end face on the back side.
The sealing device according to claim 9. The device is the crankcase of the engine
The shaft is a crankshaft,
The sealing device according to any one of claims 7 to 10.

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