JP6868386B2 - Sealing device - Google Patents

Description

The present invention relates to a sealing device used in a device having two relative rotating members.

Conventionally, as this kind of sealing device, for example, as described in Patent Document 1, one of two relative rotating members, for example, a rotating seal member called a slinger fixed to a rotating shaft, and two relative rotating members. On the other hand, for example, a sealing structure having a fixed sealing member fixed to the inner surface of the shaft hole of the housing is known. Such sealing devices are used to seal lubricants, such as grease, in the interior space of equipment. The rotary seal member is provided with a flange, which prevents or reduces the ingress of mud and dust from the atmosphere side into the equipment internal space, so that, for example, a bogie of a railroad vehicle, a bogie of a sintered pallet, a construction machine, a truck. Such sealing devices are used in equipment used in mud or dusty environments such as tranny suspensions and agricultural machinery.

Japanese Patent No. 4978074

For equipment with this type of sealing device, it is desirable to be able to reduce the ingress of foreign matter such as mud, muddy water or dust into the equipment internal space as much as possible.

Therefore, an object of the present invention is to provide a sealing device capable of further reducing the intrusion of foreign matter into the internal space of the device.

In order to solve the above problems, the sealing device according to the present invention has a hole of a first sealing member fixed to an inner member of two relative rotating members and a hole of an outer member of the two relative rotating members. A sealing device provided with a second sealing member fixed to the inner surface of the device and slidably contacting the first sealing member, and sealing a lubricant in the internal space of the device to the internal space of the device. The sealing member 1 has a sleeve fixed to the inner member and a flange integrally connected to the end of the sleeve on the atmosphere side and extending radially to the outside thereof. It is arranged on the atmosphere side of the end of the hole on the atmosphere side, has a diameter larger than that of the hole, and overlaps the portion of the outer member around the hole on the atmosphere side.

In this sealing device, the flange of the first sealing member fixed to the inner member is arranged on the atmospheric side of the hole on the atmospheric side, has a diameter larger than that of the hole, and is around the hole. Covers the atmospheric side of the outer member of the. Therefore, even if the foreign matter advances toward the flange from the atmospheric side, the foreign matter is repelled by the flange, and the invasion of the foreign matter into the hole is greatly reduced.

Preferably, the flange of the first sealing member has an elastic flange portion formed of an elastic body, and the elastic flange portion has a diameter larger than that of the hole, and the outer member has a diameter larger than that of the hole. A porous member that overlaps the portion on the atmosphere side and is softer than the elastic flange portion and slidably contacts the outer member is attached to the surface of the elastic flange portion on the side opposite to the atmosphere side. In this configuration, since the porous member is interposed between the flange and the outer member, it is difficult for foreign matter to enter the inside of the hole from the atmospheric side.

Preferably, the flange of the first sealing member has an elastic flange portion formed of an elastic body, and the elastic flange portion has a diameter larger than that of the hole, and the outer member has a diameter larger than that of the hole. A lip portion that overlaps the portion on the atmospheric side and is slidably in contact with the outer member may be formed on the side of the elastic flange portion opposite to the atmospheric side. In this configuration, the lip portion formed on the surface of the elastic flange portion of the flange opposite to the atmospheric side slidably contacts the outer member, so that foreign matter does not easily enter the inside of the hole from the atmospheric side. ..

More preferably, a recess for holding the lubricant is formed on the surface of the elastic flange portion opposite to the atmosphere side, and the lip portion forms a wall portion of the recess. In this case, since the recess for holding the lubricant exists in the vicinity of the lip portion, the invasion of foreign matter is further suppressed, the wear of the lip portion is reduced, and the torque applied to the flange from the outer member is reduced. Is reduced.

Preferably, the second sealing member has a cylindrical protrusion that is concentrically arranged with the hole and slidably contacts the flange of the first sealing member. In this configuration, since the protrusion of the second sealing member slidably contacts the flange, it is difficult for foreign matter to enter the inside of the hole from the atmospheric side.

In the present invention, the flange of the first sealing member fixed to the inner member is arranged on the atmospheric side of the hole on the atmospheric side, has a diameter larger than that of the hole, and is around the hole. Covers the atmospheric side of the outer member. Therefore, even if the foreign matter advances toward the flange from the atmospheric side, the foreign matter is repelled by the flange, and the invasion of the foreign matter into the inside of the hole and the internal space of the device is greatly reduced.

It is sectional drawing of the sealing apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing of the sealing device of FIG. 1 before being attached to a rotating shaft and a shaft hole. It is sectional drawing of the sealing apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing of the sealing apparatus which concerns on 3rd Embodiment of this invention.

Hereinafter, various embodiments according to the present invention will be described with reference to the accompanying drawings.
First Embodiment FIG. 1 is a diagram according to the first embodiment of the present invention, and shows a sealing device used for an apparatus having two relative rotating members. In the present specification, "rotation" includes not only a motion exceeding 360 ° but also a motion of rotating within a range of less than 360 °, and further includes a motion of rotating in one direction and a reverse direction within a range of less than 360 °. ..

The sealing device 1 seals between the rotating shaft (inner member in the radial direction) 4 and the inner surface of the shaft hole 6 of the housing (outer member in the radial direction) 5 into which the rotating shaft 4 is inserted. This is to prevent or reduce the leakage of fluid from the equipment internal space S to the atmosphere A side. The rotating shaft 4 has a columnar shape, the shaft hole 6 has a circular cross section, and the sealing device 1 is substantially annular, but in FIG. 1, only the shaft hole 6 and the left side portion of the sealing device 1 are shown.

The sealing device 1 is an assembly that is a combination of a rotating seal member 8 called a slinger that is fixed to the rotating shaft 4 and rotates integrally with the rotating shaft 4, and a fixed sealing member 10 that is fixed to the shaft hole 6. The rotary seal member 8 and the fixed seal member 10 cooperate to seal the lubricant in the equipment internal space S. The rotary seal member 8 is fitted to the fixed seal member 10, and when a large force is applied along the axial direction of the sealing device 1, the fitting is released and the rotary seal member 8 can be removed.

The rotary seal member 8 has a sleeve 12 fixed to the rotary shaft 4 and a flange 14 that is integrally connected to the end of the sleeve 12 on the atmosphere A side and extends radially to the outside thereof. The method of fixing the rotating shaft 4 and the sleeve 12 is not limited, but may be, for example, a tightening fit. The rotary seal member 8 has a double structure and has an elastic body, for example, an elastic ring 16 formed of an elastomer, and a rigid body, for example, a metal reinforcing ring 18, which is in close contact with the elastic ring 16 and reinforces the elastic ring 16. ..

The sleeve 12 includes an inner cylindrical portion 16a that is a part of the elastic ring 16 and is brought into close contact with the rotating shaft 4, and an outer cylindrical portion 18a that is a part of the reinforcing ring 18 and is fixed to the outer circumference of the inner cylindrical portion 16a. Has. The flange 14 is fixed to the elastic flange portion 16b, which is a part of the elastic ring 16 and is arranged on the atmosphere A side, and the elastic flange portion 16b, which is a part of the reinforcing ring 18 and is arranged on the equipment internal space S side. It has a rigid flange portion 18b.

The fixed seal member 10 also has a double structure, and has an elastic body, for example, an elastic ring 20 formed of an elastomer, and a rigid body for reinforcing the elastic ring 20, for example, a metal reinforcing ring 22. Most of the reinforcing ring 22 is embedded in the elastic ring 20, and is in close contact with the elastic ring 20.

The reinforcing ring 22 of the fixed seal member 10 includes a cylindrical portion 22a concentrically arranged in the shaft hole 6 and a disk portion 22b arranged radially inside the cylindrical portion 22a and arranged on a plane perpendicular to the shaft hole 6. It has a connecting portion 22c having a U-shaped cross section that connects the cylindrical portion 22a and the disk portion 22b.

The elastic ring 20 of the fixed seal member 10 has an outer cylindrical body 20a arranged outside the cylindrical portion 22a. The outer cylindrical body 20a is an outer seal portion fixed to the shaft hole 6. The fixing method is not limited, but may be, for example, a tight fit. The reinforcing ring 22 applies a force outward in the radial direction to the outer cylindrical body 20a of the elastic ring 20, and firmly presses the outer cylindrical body 20a against the shaft hole 6. However, the reinforcing ring 22 is not always indispensable.

Further, the elastic ring 20 has an inner cylinder 20b concentric with the outer cylinder 20a. A garter spring 30 for compressing the inner cylinder 20b inward in the radial direction is wound around the inner cylinder 20b. The inner cylindrical body 20b is formed with a receiving groove for receiving the garter spring 30.

The inner cylindrical body 20b of the elastic ring 20 of the fixed seal member 10 has a seal lip portion 36, a dust strip portion 38, and a dust strip portion 40. The seal lip portion 36 is a protrusion that protrudes inward from the inner cylindrical body 20b and is continuous in the circumferential direction. The seal lip portion 36 makes a sealing contact with the outer peripheral surface of the sleeve 12 of the rotary seal member 8 to prevent or reduce the leakage of fluid from the equipment internal space S to the atmosphere A side. When the rotary seal member 8 rotates together with the rotary shaft 4, the outer peripheral surface of the sleeve 12 slides with respect to the seal lip portion 36. The garter spring 30 applies a force for pressing the seal lip portion 36 against the rotating shaft 4 to the seal lip portion 36. FIG. 1 shows a state in which the seal lip portion 36 and other lip portions are pressed against the rotary seal member 8 and deformed.

The dust strip portions 38 and 40 extend obliquely from the inner cylindrical body 20b to the atmosphere A side and inward. The tips of the dust strips 38 and 40 are in close contact with the outer peripheral surface of the sleeve 12 of the rotary seal member 8, and when the rotary seal member 8 rotates with the rotary shaft 4, the outer peripheral surface of the sleeve 12 is in contact with the outer peripheral surface of the sleeve 12 Sliding against.

Further, the elastic ring 20 of the fixed seal member 10 has a dust strip portion 42. The dust strip portion 42 extends from the vicinity of the inner cylindrical body 20b toward the atmosphere A side, bends, and further extends radially outward and diagonally toward the atmosphere A side. The tip of the dust strip portion 42 comes into contact with the rigid flange portion 18b of the flange 14 of the rotary seal member 8, and when the rotary seal member 8 rotates with the rotary shaft 4, the rigid flange portion 18b slides against the dust strip portion 42. Move.

The dust strip portions 38, 40, and 42 mainly play a role of preventing foreign matter (mud, muddy water, and dust) from entering from the atmosphere A side to the equipment internal space S side. However, the dust strip portions 38, 40, and 42 may prevent the lubricant from flowing out from the equipment internal space S side to the atmosphere A side.

In this embodiment, the elastic flange portion 16b of the flange 14 of the rotary seal member 8 has a diameter larger than that of the shaft hole 6 and overlaps the portion of the housing 5 around the shaft hole 6 on the atmosphere A side. The rigid flange portion 18b has a diameter smaller than that of the shaft hole 6, but the rigid flange portion 18b also has a diameter larger than that of the shaft hole 6 and overlaps the portion of the housing 5 around the shaft hole 6 on the atmosphere A side. You may. Since the outer edge of the flange 14 covers the portion of the housing 5 on the atmosphere A side, even if foreign matter moves toward the flange 14 from the atmosphere A side, the foreign matter is repelled by the flange 14, and the inside of the shaft hole 6 is eventually reached. The intrusion of foreign matter into the device internal space S is greatly reduced.

Although not essential, in this embodiment, a porous member 46 is attached to the surface of the elastic flange portion 16b opposite to the atmosphere A side, and the porous member 46 is attached to the atmosphere of the housing 5 around the shaft hole 6. It makes slidable contact with the part on the A side. The porous member 46 is an annulus attached to the outer edge of the flange 14. Since the porous member 46 is interposed between the outer edge of the flange 14 and the housing 5, it is difficult for foreign matter to enter the inside of the shaft hole 6 from the atmosphere A side.

The porous member 46 is a non-woven fabric (felt), sponge, foamed resin, or foamed rubber that is softer than the material of the elastic ring 16. The porous member 46 may be bonded to the elastic flange portion 16b with an adhesive, or may be bonded by cross-linking the material. Alternatively, the porous member 46 may be joined to the elastic flange portion 16b by allowing a part of the elastomer, which is the material of the elastic ring 16, to permeate the porous member 46 during molding of the elastic ring 16.

As shown in FIG. 2, before the sealing device 1 is attached to the rotating shaft 4 and the shaft hole 6, the porous member 46 has a large thickness, and as shown in FIG. 1, the sealing device 1 is attached to the rotating shaft. When attached to the 4 and the shaft hole 6, the porous member 46 is compressed between the outer edge of the flange 14 and the housing 5 and comes into close contact with the housing 5. Therefore, until the porous member 46 is considerably worn away, no gap is formed between the portion of the housing 5 around the shaft hole 6 on the atmosphere A side and the rotary seal member 8, and foreign matter is prevented from entering.

In this embodiment, a single porous member 46 is provided, but the number of the porous members 46 is not limited, and a plurality of porous members 46 may be provided.

Although not essential, in this embodiment, the elastic ring 20 of the fixed seal member 10 has a cylindrical protrusion 44 arranged concentrically with the shaft hole 6. The protrusion 44 exists inside the outer cylinder 20a of the elastic ring 20 in the radial direction and extends in parallel with the outer cylinder 20a. The tip of the protrusion 44 comes into contact with the flange 14 of the rotary seal member 8, and when the rotary seal member 8 rotates with the rotary shaft 4, the flange 14 slides with respect to the dust strip portion 42. In this embodiment, since the protrusion 44 of the fixed seal member 10 slidably contacts the flange 14, foreign matter is unlikely to enter the inside of the shaft hole 6 from the atmosphere A side. In this way, the protrusion 44 plays a role of preventing foreign matter from entering the equipment internal space S side from the atmosphere A side.

As described above, in the sealing device 1, various measures are taken to prevent or reduce the invasion of foreign matter from the atmosphere A side into the equipment internal space S. Therefore, the sealing device 1 is used in a mud or dusty environment such as a railroad vehicle bogie, a sintered pallet bogie, a construction machine, a truck trannyon suspension, and an agricultural machine (cultivator, tractor, rice transplanter, etc.). Even in the equipment used in the above, the sealing function is suitably exhibited. However, the application of the sealing device 1 is not limited to such a device, and may be another device.

The porous member 46 may be impregnated with a lubricant (ie, oil or grease). In this case, the wear resistance of the porous member 46 is improved, and foreign matter, particularly muddy water, can be further prevented from entering the equipment internal space S side from the atmosphere A side.

Lubricant is placed in the space 50 between the seal lip portion 36 and the dust strip portion 38 (see FIG. 1), the space 52 between the dust strip portions 38 and 40, and the space 54 between the dust strip portions 40 and 42. You may. In this case, the wear resistance of these lip portions is improved.

Second Embodiment FIG. 3 shows a sealing device 61 according to a second embodiment of the present invention. In FIG. 3, the same reference numerals are used to show the components common to the first embodiment, and these components will not be described in detail.

The sealing device 61 has a rotary seal member 68 that is different from the rotary seal member 8 of the first embodiment. Similar to the rotary seal member 8 of the first embodiment, the rotary seal member 68 is integrally connected to the sleeve 12 fixed to the rotary shaft 4 and the end portion of the sleeve 12 on the atmosphere A side and radially to the outside thereof. It has an expanding flange 14. Further, the rotary seal member 68 has a double structure and has an elastic ring 16 and a reinforcing ring 18.

Similar to the rotary seal member 8 of the first embodiment, the elastic flange portion 16b of the flange 14 of the rotary seal member 68 has a diameter larger than that of the shaft hole 6, and the atmosphere of the housing 5 around the shaft hole 6 is large. It overlaps the part on the A side. The rigid flange portion 18b has a diameter smaller than that of the shaft hole 6, but the rigid flange portion 18b also has a diameter larger than that of the shaft hole 6 and overlaps the portion of the housing 5 around the shaft hole 6 on the atmosphere A side. You may. Since the outer edge of the flange 14 covers the portion of the housing 5 on the atmosphere A side, even if foreign matter moves toward the flange 14 from the atmosphere A side, the foreign matter is repelled by the flange 14, and the inside of the shaft hole 6 is eventually reached. The intrusion of foreign matter into the device internal space S is greatly reduced.

In this embodiment, the porous member 46 is not provided, and instead, an outer edge lip portion 70 is formed on the surface of the elastic flange portion 16b of the flange 14 opposite to the atmosphere A side. The outer edge lip portion 70 is a ring, extending radially outward from the outer edge of the elastic flange portion 16b and diagonally toward the device internal space S side, and the tip thereof is a portion of the housing 5 around the shaft hole 6 on the atmosphere A side. Slidable contact with. FIG. 3 shows a state in which the outer edge lip portion 70 is in contact with the housing 5 and is deformed. The dimensions of the outer edge lip portion 70 are determined so that the outer edge lip portion 70 makes a sealing contact with the housing 5. Since the outer edge lip portion 70, it is difficult for foreign matter to enter the inside of the shaft hole 6 from the atmosphere A side.

A recess 72 for holding the lubricant is formed on the surface of the elastic flange portion 16b opposite to the atmosphere A side. The outer edge lip portion 70 forms the wall portion of the recess 72. As described above, since the recess 72 for holding the lubricant exists in the vicinity of the outer edge lip portion 70, the invasion of foreign matter is further suppressed, the wear of the outer edge lip portion 70 is reduced, and the housing 5 to the flange 14 The torque given to the housing is reduced.

In this embodiment, a single outer edge lip portion 70 is provided, but the number of such lip portions is not limited.

Third Embodiment FIG. 4 shows a sealing device 81 according to a third embodiment of the present invention. In FIG. 4, the same reference numerals are used to show the components common to the first embodiment, and these components will not be described in detail.

The sealing device 81 has a rotary seal member 88 that is different from the rotary seal member 8 of the first embodiment. Similar to the rotary seal member 8 of the first embodiment, the rotary seal member 88 is integrally connected to the sleeve 12 fixed to the rotary shaft 4 and the end portion of the sleeve 12 on the atmosphere A side and radially to the outside thereof. It has an expanding flange 14. Further, the rotary seal member 88 has a double structure and has an elastic ring 16 and a reinforcing ring 18.

Similar to the rotary seal member 8 of the first embodiment, the elastic flange portion 16b of the flange 14 of the rotary seal member 88 has a diameter larger than that of the shaft hole 6, and the atmosphere of the housing 5 around the shaft hole 6 is large. It overlaps the part on the A side. The rigid flange portion 18b has a diameter smaller than that of the shaft hole 6, but the rigid flange portion 18b also has a diameter larger than that of the shaft hole 6 and overlaps the portion of the housing 5 around the shaft hole 6 on the atmosphere A side. You may. Since the outer edge of the flange 14 covers the portion of the housing 5 on the atmosphere A side, even if foreign matter moves toward the flange 14 from the atmosphere A side, the foreign matter is repelled by the flange 14, and the inside of the shaft hole 6 is eventually reached. The intrusion of foreign matter into the device internal space S is greatly reduced.

In this embodiment, the porous member 46 is not provided, and instead, an outer edge lip portion 90 is formed on the side of the elastic flange portion 16b of the flange 14 opposite to the atmosphere A side. The outer edge lip portion 90 is an annular ring and extends concentrically with the shaft hole 6 from the outer edge of the elastic flange portion 16b to the device internal space S side. A tapered surface 92 having a diameter smaller toward the S side of the device internal space is formed on the outer periphery of the outer edge lip portion 90.

A tapered surface 93 having a diameter smaller toward the device internal space S side is formed in a portion of the housing 5 around the shaft hole 6 on the atmosphere A side. The tapered surface 92 of the outer edge lip portion 90 of the flange 14 slidably contacts the tapered surface 93 of the housing 5. FIG. 4 shows a state in which the outer edge lip portion 90 is in contact with the housing 5 and is deformed. The dimensions of the outer edge lip portion 90 are determined so that the outer edge lip portion 90 makes a sealing contact with the housing 5. Since the outer edge lip portion 90, it is difficult for foreign matter to enter the inside of the shaft hole 6 from the atmosphere A side.

The lubricant may be placed in the space 94 between the outer edge lip portion 90 and the protrusion 44. In this case, the wear resistance of the outer edge lip portion 90 and the protrusion 44 is improved, and the torque applied from the housing 5 to the flange 14 is reduced.

The rotary seal member 88 of this embodiment may be further provided with the outer edge lip portion 70 of the second embodiment.

Other Modifications Although the embodiments of the present invention have been described above, the above description does not limit the present invention, and various modifications including deletion, addition, and replacement of components within the technical scope of the present invention. Can be considered.
For example, the shape and number of lip portions of the fixed seal member 10 are not limited to those described above.

In the above embodiment, the shaft 4 is a rotating shaft, and the housing having the shaft hole 6 is a stationary member. However, the present invention is not limited to the above embodiment, and can be applied to sealing between two members that rotate relative to each other. For example, the shaft 4 (and the seal member 8) may be stationary and the housing (and the seal member 10) may rotate around it, or both the shaft 4 and the housing may rotate.

A Atmosphere S Equipment internal space 1,61,81 Sealing device 4 Rotating shaft (inner member)
5 Housing (outer member)
6 Shaft hole (hole)
8,68,88 rotary seal member (first seal member)
10 Fixed seal member (second seal member)
12 Sleeve 14 Flange 16 Elastic ring 18 Reinforcing ring 16a Inner cylindrical part 16b Elastic flange part 18a Outer cylindrical part 18b Rigid flange part 20 Elastic ring 20a Outer cylindrical body 20b Inner cylindrical body 22 Reinforcing ring 22a Cylindrical part 22b Disk part 22c Connecting part 30 Garter spring 36 Seal lip part 38, 40, 42 Dustrip part 44 Projection 46 Porous member 50, 52, 54, 94 Space 70, 90 Outer edge lip part 72 Recessed 92 Tapered surface 93 Tapered surface

Claims (2)

A first seal member fixed to the shaft axis and housing rotate relative
A second sealing member fixed to the inner surface of the hole of the housing and slidably contacting the first sealing member is provided.
A sealing device that seals the lubricant in the internal space of the equipment to the internal space of the equipment.
The first seal member is
The sleeve fixed to the shaft and
It has a flange that is integrally connected to the end of the sleeve on the atmosphere side and extends radially to the outside thereof.
The flange is located closer to the atmosphere than the atmospheric end of the hole, has a larger diameter than the hole, and overlaps the atmospheric portion of the housing around the hole.
The flange of the first sealing member has an elastic flange portion formed of an elastic body.
The elastic flange portion has a diameter larger than that of the hole and overlaps the atmospheric side portion of the housing.
A sealing device characterized in that a porous member that is softer than the elastic flange portion and slidably contacts the housing is attached to a surface of the elastic flange portion that is opposite to the atmosphere side. The first aspect of the present invention, wherein the second sealing member is arranged concentrically with the hole and has a cylindrical protrusion that slidably contacts the flange of the first sealing member. Sealing device.

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