JP2018105323A - Seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal device capable of further improving resistance to muddy water and dust.SOLUTION: A seal device 10 includes: an outer circumferential side seal member 20 attached to one side member of two members; an inner circumferential side seal member 30 attached to the other side member; a protection member 40 attached between the outer circumferential side seal member and the inner circumferential side seal member; and a cover member 50 attached to the inner circumferential side seal member 30. Therein, the protection member 40 has an outer circumferential flange part 42 arranged at an outside B of the machine of the inner circumferential side seal member 30, the cover member 50 is arranged at the outside B of the machine of the outer circumferential flange part 42, has an inner circumferential side flange 52 which is brought into contact with an end surface of the outside of the machine of the outer circumferential flange part 42, the protection member 40 is assembled movably in an axial direction with respect to the outer circumferential side seal member 20 and the inner circumferential side seal member 30 and is elastically energized in such a direction that the outer circumferential side flange part 42 is pushed against the inner circumferential side flange part 52 by an elastic member 70.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing device, and more particularly to a sealing device that is used in a severe external environment, such as that required for muddy water resistance and dust resistance, such as for agricultural machinery. The sealing device of the present invention is also used as an oil seal for a hub bearing and an oil seal for a differential gear.

  2. Description of the Related Art Conventionally, a sealing device as shown in FIG. 2 is provided in an annular gap 562 between a housing 560 and a rotary shaft 561 in order to prevent muddy water, dust and the like from entering from the outside B to the inside A. 510 is attached.

  The sealing device 510 is slidably in contact with the outer peripheral side seal member 520 attached to the inner peripheral surface 560a of the housing 560 and the inner peripheral side of the outer peripheral side seal member 520, and is attached to the outer peripheral surface 561a of the rotating shaft 561. Of the inner peripheral side sealing member 530, the protective member 540 that is fitted to the metal ring 522 of the outer peripheral side sealing member 520, and extends from the housing 560 side toward the inner diameter direction, and the inner peripheral side sealing member 530 A cover member 550 made of a metal material or a resin material is provided which is fitted on the peripheral side and is in close contact with the other surface 543b of the protection member 540.

  In the sealing device 510 configured as described above, when the cover member 550 is in close contact with the protective member 540, muddy water, dust, and the like flying from the outside B of the machine enter between the outer peripheral side seal member 520 and the inner peripheral side seal member 530. Therefore, the durability of the sealing device 510 is improved.

  Further, in the sealing device 510 having the above-described configuration, the cover member 550 is made of a metal material or a resin material having a high rigidity with respect to the rubber material, and the cover member 550 is in close contact with the protection member 540, so that muddy water, dust, and the like are generated. The cover member 550 is prevented from being deposited and adhered, thereby maintaining a stable sealing property.

  However, the sealing device 510 having the above configuration has room for further improvement in the following points.

  In recent years, the sealing device 510 may be used for agricultural machines used in areas where the environment such as muddy water and dust becomes severe. When the sealing device 510 is used in such a harsh environment, a cover member is used. 550 may be deformed, and muddy water, dust, or the like may enter the sliding portions of the outer peripheral side seal member 520 and the inner peripheral side seal member 530 from the gap between the deformed cover member 550 and the protection member 540.

JP 2002-98234 A

  This invention is made | formed in view of the above points, The technical subject is to provide the sealing device which can improve a muddy water resistance and dust property further.

  As a means for effectively solving the technical problem described above, the present invention provides a sealing device for sealing an annular gap between two relatively rotating members, wherein the sealing device is attached to one of the two members. An outer peripheral seal member to be attached, an inner peripheral seal member attached to the other member, a protective member attached between the outer peripheral seal member and the inner peripheral seal member, and the inner peripheral seal member A cover member to be attached, and the protective member is bent toward the inner peripheral side from an end on the outer side in the axial direction, and is disposed on the outer side of the inner peripheral side seal member. The cover member is disposed on the machine outer side of the outer peripheral flange part, and has an inner peripheral flange part that contacts an end surface of the outer peripheral flange part on the machine outer side. The material is assembled so as to be axially displaceable with respect to the outer peripheral side seal member and the inner peripheral side seal member, and elastically biased in a direction in which the outer peripheral side flange portion is pressed against the inner peripheral side flange portion by an elastic member. It is characterized by being.

  In the present invention, it is preferable that the protection member integrally includes a cylindrical portion disposed between the outer peripheral side seal member and the inner peripheral side seal member and the outer peripheral flange portion, and the outer peripheral side seal. The member is formed with a convex portion that slidably contacts the outer peripheral surface of the cylindrical portion.

  In the present invention, it is preferable that the elastic member is a coil spring, and the outer peripheral side sealing member is provided with a recess for holding one end of the coil spring.

  According to the sealing device of the present invention, since the cylindrical portion of the protective member is displaced in the axial direction by elastic bias, the cover member and the protective member are maintained in close contact with each other, and the sealing device is further improved in mud water resistance and dust resistance. Can be improved.

It is sectional drawing of the sealing device which concerns on embodiment of this invention. It is sectional drawing of the sealing device which concerns on a prior art.

  Next, the sealing device 10 according to the present embodiment will be described in detail based on the drawings.

  As shown in FIG. 1, the sealing device 10 according to the present embodiment is attached to an annular gap 62 between the housing 60 and the rotary shaft 61, and includes an outer peripheral side seal member 20 attached to the housing 60. The inner peripheral side seal member 30 attached to the rotating shaft 61, the protective member 40 held between the outer peripheral side seal member 20 and the inner peripheral side seal member 30, and the cover member attached to the inner peripheral side seal member 30 50 and an elastic member 70 that elastically urges the protection member 40 toward the machine outer side B in the axial direction.

  The outer peripheral side sealing member 20 is composed of a metal ring 22 having an L-shaped cross section and a rubber-like elastic body 21 attached to the metal ring 22, and is fitted to an inner peripheral surface 60 a of the housing 60. And a seal portion 24 extending in the inner diameter direction from the end portion of the inner side A in the axial direction of the cylindrical portion 23.

  The inner circumferential side seal member 30 includes a metal ring 32 having an L-shaped cross section and a rubber-like elastic body 31 attached to the metal ring 32, and is fitted to the outer circumferential surface 61 a of the rotating shaft 61. A cylindrical portion 33 to be joined, and a seal portion 34 extending from the end of the machine-side B in the axial direction of the cylindrical portion 33 toward the outer diameter direction are provided.

  The protective member 40 is disposed between the outer peripheral side seal member 20 and the inner peripheral side seal member 30 so as to be displaceable in the axial direction.

  The cover member 50 is made of a plate spring that can be elastically deformed in the axial direction, and the tip 52a thereof is elastically biased toward the machine inner side A in the axial direction.

  The elastic member 70 is disposed on the inner surface of the protection member 40.

  Each space between the outer peripheral side sealing member 20 and the inner peripheral side sealing member 30 is filled with grease (not shown). Details of each of the above configurations are as follows.

(Outer peripheral side seal member)
The cylindrical portion 23 seals between the housing 60 and the cylindrical portion 23 by fitting the outer peripheral surface thereof with the inner peripheral surface 60 a of the housing 60. Further, the cylindrical portion 23 is formed with a convex portion 25 that seals between the protective member 40 and the cylindrical portion 23 by the inner peripheral surface 23a of the cylindrical portion 23 being in close contact with the outer peripheral surface 41a of the protective member 40. ing.

  In the seal portion 24, the machine-side seal lip 24 a and the machine-side seal lip 24 b formed at the inner circumferential side end of the seal portion 24 are slidably in contact with the outer circumferential surface 33 a of the cylindrical portion 33 of the inner circumferential side seal member 30. Thus, the space between the outer peripheral side sealing member 20 and the inner peripheral side sealing member 30 is sealed.

  Further, the outer peripheral side seal member 20 is slidably brought into contact with the seal portion 34 of the inner peripheral side seal member 30 by extending from the middle of the radial direction toward the machine outer side B, so that the outer peripheral side A protrusion 26 is formed to seal between the seal member 20 and the inner peripheral seal member 30. Further, a concave portion 26a is formed on the outer peripheral surface of the protruding portion 26, and the concave portion 26a is mounted so that one end of the inner side A of the elastic member 70 in the axial direction is fitted.

(Inner circumference side seal member)
The cylindrical portion 33 seals between the rotary shaft 61 and the cylindrical portion 33 by fitting the inner peripheral surface of the cylindrical portion 33 with the outer peripheral surface 61 a of the rotary shaft 61. The cylindrical portion 33 has an outer peripheral surface 33a slidably in contact with the outer side seal lip 24a and the inner side seal lip 24b of the outer peripheral side seal member 20, so that the outer peripheral side seal member 20 and the inner peripheral side The space between the seal member 30 is sealed.

  The seal portion 34 is formed with a sub lip 35 whose diameter decreases from the outer peripheral side end portion toward the inner diameter direction, and a tip portion 35 a of the sub lip 35 slides on one surface 43 a of the outer peripheral side flange portion 42 of the protection member 40. Touching freely. An elastic member 70 is disposed on the outer peripheral side of the seal portion 34.

(Protective member)
The cylindrical portion 41 has an outer peripheral surface 41a that is in close contact with the convex portion 25 of the outer peripheral side seal member 20, and an inner peripheral side that is in contact with the elastic member 70 that is mounted on the concave portion 26a of the protruding portion 26. The outer peripheral side flange portion 42 extends in the inner diameter direction from one end of the machine outside B.

  The outer peripheral side flange portion 42 has one surface 43a elastically urged by the elastic member 70 and slidably contacts with the sub lip 35 formed on the seal portion 34 of the inner peripheral side seal member 30. The surface 43b of the cover member 50 is in close contact with the tip end portion 52a of the inner peripheral flange portion 52 of the cover member 50.

(Cover member)
The cover member 50 includes a fixed portion 51 that is fitted to the inner peripheral surface of the inner peripheral side seal member 30, and an inner peripheral flange that is bent toward the outer diameter direction from one end of the machine-side outer side B in the axial direction of the fixed portion 51. Part 52. And the front-end | tip part 52a of the outer peripheral side of the inner peripheral side flange part 52 is contacting with the outer peripheral side flange part 42 in the protection member 40 with a required elastic restoring force.

(Elastic member)
The elastic member 70 is located on the inner peripheral side of the cylindrical portion 41 and on the outer peripheral side of the seal portion 34 in the inner peripheral side seal member 30 and is formed of a coil spring that exhibits an elastic restoring force in the axial direction. . One end of the elastic member 70 is attached to the recess 26a of the protrusion 26 in a state compressed in the axial direction.

  In the sealing device 10 having the above configuration, the inner peripheral side seal member 30 is disposed on the inner peripheral side of the outer peripheral side seal member 20, and the protective member 40 is disposed between the outer peripheral side seal member 20 and the inner peripheral side seal member 30. Is arranged. Further, one end of the elastic member 70 is attached to the concave portion 26 a of the protruding portion 26 located inside the cylindrical portion 41. Further, the cylindrical portion 41 of the protection member 40 located on the outer peripheral side of the elastic member 70 is held by a convex portion 25 formed on the inner peripheral side of the cylindrical portion 23 of the outer peripheral side seal member 20 and also has a concave portion. It is held by an elastic member 70 attached to 26a. In addition, the outer peripheral side flange portion 42 of the cylindrical portion 41 has one surface 43 a elastically biased by the elastic member 70, and is slidable with the sub lip 35 formed on the seal portion 34 of the inner peripheral side seal member 30. And the other surface 43b comes into close contact with the front end portion 52a of the inner peripheral flange portion 52 of the cover member 50.

  Thereby, the sealing device 10 according to the present embodiment is in a state in which the outer peripheral side seal member 20, the inner peripheral side seal member 30, the protective member 40, and the cover member 50 are combined, and the protective member 40 can be displaced in the axial direction. It is said that.

  Next, the operation of the protection member 40 and the cover member 50 in the sealing device 10 according to the present embodiment will be described.

  First, when the device or the like is operated, the inner peripheral side seal member 30 and the cover member 50 together with the rotary shaft 61 are fixed while the outer peripheral side seal member 20 and the protective member 40 held by the outer peripheral side seal member 20 are fixed. Rotate.

  And the outer peripheral side flange part 42 in the protection member 40 in the sealing device 10 which concerns on this embodiment is pressed against the inner peripheral side flange part 52, and as shown in FIG. The flange portion 52 is in close contact. Here, when the elastic restoring force of the inner peripheral flange portion 52 in the cover member 50 is reduced, a gap is generated between the outer peripheral flange portion 42 and the inner peripheral flange portion 52. Is pressed in the axial direction by the elastic restoring force of the elastic member 70. And the outer peripheral side flange part 42 and the inner peripheral side flange part come into close contact again by the axial displacement to the position where the protection member 40 contacts the inner peripheral side flange part 52.

  As described above, according to the sealing device 10 according to the present embodiment, even when the elastic restoring force of the cover member 50 is reduced, the cylindrical portion 41 of the protection member 40 is displaced in the axial direction, so that the protection member 40 and the cover member The contact state with 50 can be maintained. Therefore, a gap is not generated between the protection member 40 and the cover member 50, and muddy water, dust and the like are prevented from entering between the outer peripheral side seal member 20 and the inner peripheral side seal member 30.

  Further, according to the sealing device 10 according to the present embodiment, the convex portion 25 formed on the inner peripheral surface 23 a of the cylindrical portion 23 of the outer peripheral side seal member 20 is connected to the outer peripheral surface 41 a of the cylindrical portion 41 of the protection member 40. By contacting, the space between the cylindrical portion 23 and the cylindrical portion 41 of the outer peripheral side sealing member 20 is sealed, and at the same time, the cylindrical portion 41 is held so as to be axially displaceable.

  Further, according to the sealing device 10 according to the present embodiment, the protruding portion 26 formed on the seal portion 24 of the outer peripheral side seal member 20 is slidably in contact with the seal portion 34 of the inner peripheral side seal member 30. The recess 26 a formed in the protrusion 26 holds the elastic member 70 at the same time as sealing between the outer peripheral seal member 20 and the inner peripheral seal member 30. Thereby, the elastic member 70 is firmly attached to the outer peripheral side seal member 20.

  Further, according to the sealing device 10 according to the present embodiment, the sub lip 35 formed on the seal portion 34 of the inner peripheral side seal member 30 comes into contact with the outer peripheral side flange portion 42 of the protection member 40, so that muddy water, dust, etc. Is prevented from entering between the outer peripheral side seal member 20 and the inner peripheral side seal member 30.

  Further, according to the sealing device 10 according to the present embodiment, since the spaces in the outer peripheral side seal member 20 and the inner peripheral side seal member 30 are filled with grease, the water repellent against the muddy water from which the grease tries to enter from the outside. By exhibiting the effect and the trapping property against dust, intrusion of muddy water, dust and the like is prevented, and at the same time, the cylindrical portion 41 of the protective member 40 functions as a lubricant that smoothly displaces in the axial direction.

  In addition, the sub lip 35 in the sealing device 10 according to the present embodiment may be provided with a margin in advance so that the protection member 40 can follow the displacement when the protection member 40 is displaced in the axial direction.

  The elastic member according to the present invention may be a spiral resin or a cylindrical rubber in addition to the metal coil spring, and can press the protective member in the axial direction. If it is a thing, it will not specifically limit.

DESCRIPTION OF SYMBOLS 10 Sealing device 20 Outer peripheral side sealing member 21 Rubber-like elastic body 22 Metal ring 23 Cylindrical part 23a Inner peripheral surface 24 Seal part 24a Outer side seal lip 24b Inner side seal lip 25 Convex part 26 Protrusion part 26a Concave part 30 Inner peripheral side Seal member 31 Rubber elastic body 32 Metal ring 33 Cylindrical portion 33a Outer peripheral surface 34 Seal portion 35 Sub lip 35a Tip 40 Protection member 41 Cylindrical portion 41a Outer peripheral surface 42 Outer peripheral flange portion 43a One surface 43b The other surface 50 Cover member 51 Fixed portion 52 Inner peripheral flange portion 52a Tip portion 60 Housing 60a Inner peripheral surface 61 Rotating shaft 61a Outer peripheral surface 62 Annular gap 70 Elastic member A Machine inner side B Machine outer side

Claims (3)

In a sealing device for sealing an annular gap between two members that rotate relative to each other,
The sealing device includes an outer peripheral seal member attached to one of the two members, an inner peripheral seal member attached to the other member, the outer peripheral seal member, and the inner peripheral seal member. A protective member attached in between, and a cover member attached to the inner peripheral side sealing member,
The protective member is bent toward the inner peripheral side from an end on the outer side in the axial direction, and has an outer peripheral flange portion disposed on the outer side of the inner peripheral side seal member,
The cover member is disposed on the outer side of the outer peripheral side flange portion, and has an inner peripheral flange portion that contacts an end surface on the outer side of the outer peripheral side flange portion,
The protective member is assembled so as to be axially displaceable with respect to the outer peripheral side seal member and the inner peripheral side seal member, and elastically elastically presses the outer peripheral flange portion against the inner peripheral flange portion. A sealing device characterized by being biased. The sealing device according to claim 1,
The protective member integrally includes a cylindrical portion disposed between the outer peripheral side seal member and the inner peripheral side seal member, and the outer peripheral flange portion,
The sealing device according to claim 1, wherein the outer peripheral side sealing member is formed with a convex portion that slidably contacts the outer peripheral surface of the cylindrical portion. The sealing device according to claim 1 or 2,
The elastic member comprises a coil spring,
The sealing device according to claim 1, wherein the outer peripheral side sealing member is provided with a recess for holding one end of the coil spring.

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