JP6533737B2 - Sealing device - Google Patents

Description

  The present invention relates to a shaft seal portion of various devices, in particular, a seal device used for a differential side of an automobile.

  The sealing device used for the differential side of a conventional automobile is, as shown in FIG. 2, foreign matter such as mud water from the outer side 122 of the housing 210 in an annular space formed between the shaft 200 and the housing 210 rotating relative to each other. And a sealing member 100 mounted on the housing 210, and a slinger 110 disposed on the outer side 122 of the sealing member 100 and mounted on the shaft 200, in order to prevent There is.

  The seal member 100 includes a core metal 101 having a substantially U-shaped cross section opened on the inner side 121, a main lip 102 and an auxiliary lip 103 fixed radially inward of the core metal 101 and in sliding contact with the outer peripheral surface of the shaft 200. It has a side lip 104 fixed to the outer side 122 of the cored bar 101 and extending diagonally outward in the radial direction of the outer side 122. In recent years, in the sealing device, the side lip 104 is in sliding contact with the slinger 110 as the demand for high sealing is increased (see, for example, Patent Document 1).

Unexamined-Japanese-Patent No. 2007-225064

  In the sealing device, the side of the sealing member 100 is reciprocated (thrust movement) in the axial direction between the solid line position and the two-dot chain line position in the figure during operation. The volume of the space 123 defined by the lip 104, the slinger 110, the outer peripheral surface of the shaft 200, and the auxiliary lip 103 may change. In this case, when the volume of the space 123 is reduced, the space 123 has a positive pressure, and the air in the space 123 flows out from between the tip of the side lip 104 and the slinger 110 to the outside 122. And the space part 123 becomes negative pressure because the volume of the space part 123 becomes large after that.

  When such a negative pressure occurs, the area of the sliding contact portion of the side lip 104 with the slinger 110 increases, so that the temperature rises with the increase of the torque, resulting in insufficient lubrication at the sliding contact portion. Further, as the reaction force of the side lip 104 increases, the torque (temperature) further increases, and the wear of the sliding contact portion of the side lip 104 is promoted. Therefore, when the negative pressure is generated, the life of the side lip 104 is reduced, and the function of preventing foreign matter from entering the space portion 123 is deteriorated.

  This invention is made in view of such a problem, and it is providing the sealing device which can suppress that the life of a side lip falls due to the movement of the slinger which a side lip sliding-contacts. To aim.

  The sealing device of the present invention is mounted on the housing in order to prevent foreign matter from entering the inside from the outside of the housing in an annular space formed between the shaft and the housing which rotate relative to each other. A sealing device comprising: a seal member; and a slinger having a sliding contact surface radially extending on the outer side with respect to the seal member and mounted on the shaft, wherein the seal member is the outer side A core metal portion having a substantially U-shaped cross section and a main lip fixed to an outer end in the axial direction of a small diameter cylindrical portion on the inner side in the radial direction of the core metal and slidingly contacting the outer peripheral surface of the shaft The auxiliary lip fixed to the axially outer end of the cylindrical portion and in sliding contact with the outer peripheral surface of the shaft on the outer side with respect to the main lip, and the inner peripheral surface of the large diameter cylindrical portion radially outside the cored bar , And opening the core portion A side lip fixed to the side surface on the back side and in sliding contact with the sliding contact surface of the slinger, the side lip, the slinger, the outer peripheral surface of the shaft, the auxiliary lip, the outer peripheral surface of the small diameter cylindrical portion, and A space is defined by the side surface on the back side of the opening.

  According to the present invention, the space portion includes the side lip, the slinger, the outer peripheral surface of the shaft, and the auxiliary lip as well as the outer peripheral surface of the small diameter cylindrical portion in the substantially U-shaped cross section open in the outside. And it is section-formed also by the side of the opening back side. Thus, the volume of the space can be made larger in the axial direction than the volume of the conventional space 123 (see FIG. 2). Therefore, even if the volume of the space changes due to the thrust movement of the slinger. The rate of change can be reduced. As a result, it is possible to reduce the positive pressure value and the negative pressure value in the space portion, and to suppress the wear of the sliding portion of the side lip with the slinger. Therefore, it is possible to suppress a decrease in the life of the side lip due to the movement of the slinger which is in sliding contact with the side lip.

  The cored bar portion is a first large diameter cylindrical body axially extending along the inner peripheral surface of the housing, and a first annular ring extending radially inward from an axial inner end portion of the first large diameter cylindrical body A first cored bar having a body and a first small diameter cylindrical body extending axially outward from an inner peripheral end of the first annular body, the first small diameter cylindrical body constituting the small diameter cylindrical portion; A second cylindrical body fitted and fixed to the inner peripheral surface of the first large-diameter cylindrical body, and extending radially inward from an axial inner end portion of the second cylindrical body and the first annular body A second cored bar having a second annular body fixed to the side surface on the outer side, wherein the inner peripheral surface of the second cylindrical body constitutes the inner peripheral surface of the large diameter cylindrical portion, It is preferable that the side surface on the outer side of the 2-ring body constitutes the side surface on the back side of the opening.

  In this case, the main lip and the auxiliary lip are fixed to the first small diameter cylindrical body (small diameter cylindrical portion) of the first core metal, and the side lip is fixed to the second annular body of the second core metal. The seal member can be easily manufactured by fitting and fixing the second cored bar on which the side lip is fixed to the first cored bar on which the auxiliary lip is fixed.

  The sealing device of the present invention is particularly effective when it is used on the differential side of a car, because the thrusting movement of the slinger is remarkable.

  ADVANTAGE OF THE INVENTION According to the sealing device of this invention, it can suppress that the lifetime of a side lip originates in the movement of the slinger which a side lip slidably contacts.

It is a sectional view showing an important section of a sealing device concerning one embodiment of the present invention. It is sectional drawing which shows the principal part of the conventional sealing device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.
FIG. 1 is a cross-sectional view showing the main part of a sealing device according to an embodiment of the present invention. The sealing device 1 is used for a differential side of a car, and is mounted in an annular space formed between a shaft 81 and a housing 82 which rotate relative to each other. To prevent the ingress of foreign matter such as mud.

The sealing device 1 includes a seal member 2 mounted on the inner peripheral surface 82 a of the housing 82 and a slinger 10 mounted on the outer peripheral surface 81 a of the shaft 81 on the outer side B of the seal member 2.
The slinger 10 is, for example, made of metal such as stainless steel (for example, SUS material etc.), and the cylindrical body 11 fitted on the outer peripheral surface 81 a of the shaft 81 and the radial outer side from the axial inner end portion of the cylindrical body 11 And an annular body 12 extending in the direction. The inner side surface 12a of the torus 12 is a sliding contact surface in sliding contact with a lip tip end 64b of a side lip 64 described later.

  The seal member 2 includes a cored bar portion 3 and a seal main body 6 provided on the cored bar portion 3. The metal core portion 3 has a large diameter cylindrical portion 31, an annular portion 32, and a small diameter cylindrical portion 33, and is formed into a substantially U-shaped cross section opened to the outside B by these.

  The metal core 3 has a first metal core 4 having a substantially U-shaped cross section and a second metal core 5 having a substantially L-shaped cross-section, which is press-fit fitted to the first metal core 4. And. The first cored bar 4 is an annular member as a whole, and includes a first large diameter cylindrical body 41, a first annular body 42, and a first small diameter cylindrical body 43. The second core metal 5 is also an annular member as a whole, and has a second cylindrical body 51 and a second annular body 52.

  In the first core metal 4, the first large diameter cylindrical body 41 is formed to extend in the axial direction along the inner peripheral surface 82 a of the housing 82. At an axially inner end portion of the first large-diameter cylindrical body 41, a first annular body 42 which is bent radially inward and extends inward in the radial direction is formed. At an inner peripheral end of the first annular body 42, a first small diameter cylindrical body 43 which is bent to the outer side B and extends to the outer side B is formed. The first small diameter cylindrical body 43 has an annular projecting portion 43a which protrudes radially inward at the axial outer end portion thereof.

In the second core metal 5, at the axially inner end portion of the second cylindrical body 51, a second annular body 52 which is bent radially inward and extends inward in the radial direction is formed. The axial length of the second cylindrical body 51 is shorter than the first large diameter cylindrical body 41 of the first core metal 4, and the radial length of the second annular body 52 is the first It is formed shorter than the first annular body 42 of the core 4.
The second cylindrical body 51 of the second core metal 5 is fitted and fixed to the inner circumferential surface of the first large-diameter cylindrical body 41 of the first core metal 4. Further, the second annular body 52 of the second core metal 5 is fixed to the side surface of the first annular body 42 on the outer side B of the first core metal 4.

  According to the above configuration, in the present embodiment, the first large-diameter cylindrical body 41 and the second cylindrical body 51 constitute the large-diameter cylindrical portion 31 of the core 3 and the inner circumferential surface of the second cylindrical body 51. The reference numeral 51 a constitutes the inner circumferential surface of the large diameter cylindrical portion 31. The first annular body 42 and the second annular body 52 constitute the annular portion 32 of the cored bar 3, and the side surface 52 a of the outer side B of the second annular body 52 is the cored body 3. It constitutes the side of the back of the opening. Furthermore, the first small diameter cylindrical body 43 alone constitutes the small diameter cylindrical portion 33 of the cored bar 3.

The seal body 6 is formed of an elastic material such as synthetic rubber, and the seal portion 61 bonded to the first cored bar 4 by vulcanization and the main lip 62 and the auxiliary lip 63 and the second cored bar 5 are vulcanized. And a side lip 64 bonded.
The seal portion 61 is an annular member as a whole, and is formed in a substantially U-shaped cross section. The seal portion 61 includes the axially outer end surface and the outer peripheral surface of the first large diameter cylindrical body 41, the side surface of the first annular body 42 on the inner side A, the inner peripheral surface of the first small diameter cylindrical body 43 and the projecting portion 43a. And fixed so as to cover each of them. A large diameter cylindrical seal portion 61 a covering the outer peripheral surface of the first large diameter cylindrical body 41 in the seal portion 61 is fitted and fixed to the inner peripheral surface 82 a of the housing 82.

  The small diameter cylindrical seal portion 61b covering the inner peripheral surface of the first small diameter cylindrical body 43 and the projecting portion 43a in the seal portion 61 extends from the end of the outer side B to the inner side A inward in the radial direction. An annular main lip 62 is formed in sliding contact with the outer peripheral surface 81 a of the first. A circumferential groove 62a is formed on the outer peripheral surface of the main lip 62, and an annular spring member 7 for pressing the main lip 62 from the outer peripheral side is attached to the circumferential groove 62a. The main lip 62 is pressed against the outer peripheral surface 81 a of the shaft 81 by being tightened by the spring member 7, and seals between the outer peripheral surface 81 a and the first core metal 4.

  The small-diameter cylindrical seal portion 61b of the seal portion 61 extends from the end of the outer side B to the outer side B and radially inward, and on the outer side B of the main lip 62 on the outer peripheral surface 81a of the shaft 81. An annular auxiliary lip 63 in sliding contact is formed. Thereby, the auxiliary lip 63 prevents foreign matter which has passed through the sliding contact portion between the side lip 64 and the slinger 10 from the outer side B from invading the inner side A.

  The side lip 64 is formed of an annular member, and is fixed to the axially outer end surface and the inner circumferential surface 51 a of the second cylindrical body 51 and the radially outer end of the side surface 52 a of the second annular body 52. The side lip 64 has an outer side B and a radially inward extending lip proximal end 64a, and a lip distal end 64b extending outward and radially outward from the distal end of the lip proximal end 64a. . The lip tip end portion 64 b is in sliding contact with the inner side surface 12 a of the torus 12 of the slinger 10 to prevent foreign matter from invading the inside side A from the outside side B.

  With the above configuration, the side lip 64, the slinger 10, the outer peripheral surface 81a of the shaft 81, the auxiliary lip 63, the outer peripheral surface 43b of the first small diameter cylindrical body 43, and the side surface 52a of the second annular body 52 An annular space C is defined.

  As described above, according to the sealing device 1 of the present embodiment, the space C is opened in the outer side B in addition to the side lip 64, the slinger 10, the outer peripheral surface 81a of the shaft 81, and the auxiliary lip 63. A section is also formed by the outer peripheral surface 43b of the small diameter cylindrical portion 33 in the letter-shaped cored bar portion 3 and the side surface 52a on the back side of the opening. Thus, the volume of the space C can be made larger in the axial direction than the volume of the conventional space 123 (see FIG. 2). Even if the volume of the space portion C changes, the rate of change can be reduced by the thrust movement that reciprocates in the axial direction between the two-dot chain line position. As a result, the positive pressure value and the negative pressure value in the space C can be reduced, and wear of the sliding contact portion of the side lip 64 with the slinger 10 can be suppressed. Therefore, it is possible to suppress a decrease in the life of the side lip 64 due to the side lip 64 coming into sliding contact with the slinger 10. In particular, when the sealing device 1 is used on the differential side of an automobile, the above-mentioned thrust movement of the slinger 10 is remarkable, which is effective.

  Further, the main lip 62 and the auxiliary lip 63 are fixed to the first small diameter cylindrical body 43 of the first core metal 4, and the side lip 64 is fixed to the second annular body 52 of the second core metal 5. The seal member 2 can be easily manufactured by fitting and fixing the second core metal 5 to which the side lip 64 is fixed to the first core metal 4 to which the 62 and the auxiliary lip 63 are fixed.

In addition, this invention can be suitably changed and implemented, without being limited to the said embodiment. For example, the sealing device 1 of the present invention may be applied to shaft seals of various devices in addition to the differential side of a car.
Further, in the above embodiment, only the side surface 52a of the second annular body 52 is used as the side surface on the back side of the opening of the metal core portion 3 which defines the space C, but the second annular body 52 The side surface 52a of the second annular body 52 and the side surface of the outer side B of the first annular body 42 may be used. The side surface 52a of the second annular body 52 and the side surface of the outer side B of the first annular body 42 may be used. May be used.

  1: Sealing device 2: Seal member 3: Core metal part 4: First core metal 5: Second core metal 10: Slinger 12a: Sliding contact surface 31: Large diameter cylindrical part 33: Small diameter Cylindrical part 41: first large diameter cylindrical body 42: first annular body 43: first small diameter cylindrical body 43b: outer peripheral surface (peripheral surface of small diameter cylindrical part) 51: second cylindrical body 51a: Inner peripheral surface (inner peripheral surface of large diameter cylindrical portion), 52: second annular body, 52a: side surface (side surface of opening of core metal portion), 62: main lip, 63: auxiliary lip, 64: side Lip, 81: shaft, 81a: outer peripheral surface, 82: housing, A: inner side, B: outer side, C: space portion

Claims (3)

A seal member attached to the housing to prevent foreign matter from entering the inside from the outside of the housing in an annular space formed between the shaft and the housing which rotate relative to each other; A sealing device having a sliding contact surface radially extending on the outer side with respect to a member and mounted on the shaft,
The seal member is
A metal core portion having a substantially U-shaped cross section opened to the outside;
A main lip fixed to the axially outer end portion of the small diameter cylindrical portion on the inner side in the radial direction of the metal core portion and in sliding contact with the outer peripheral surface of the shaft;
An auxiliary lip fixed to the axially outer end of the small diameter cylindrical portion and in sliding contact with the outer peripheral surface of the shaft on the outer side with respect to the main lip;
And a side lip fixed to the inner peripheral surface of the large diameter cylindrical portion on the radially outer side of the metal core portion and the side surface on the back side of the opening of the core metal portion and in sliding contact with the sliding contact surface of the slinger
A sealing device characterized in that a space is defined by the side lip, the slinger, the outer peripheral surface of the shaft, the auxiliary lip, the outer peripheral surface of the small diameter cylindrical portion, and the side surface on the back side of the opening. The core portion is
A first large diameter cylindrical body axially extending along an inner circumferential surface of the housing, a first annular body extending radially inward from an axial inner end of the first large diameter cylindrical body, and the first annular body A first cored bar having a first small diameter cylindrical body extending axially outward from an inner peripheral end of the torus, wherein the first small diameter cylindrical body constitutes the small diameter cylindrical portion;
A second cylindrical body fitted and fixed to the inner peripheral surface of the first large-diameter cylindrical body, and extending radially inward from an axial inner end portion of the second cylindrical body and the first annular body And a second cored bar having a second annular body fixed to the side surface on the outer side,
The inner circumferential surface of the second cylindrical body constitutes the inner circumferential surface of the large-diameter cylindrical portion, and the side surface on the outer side of the second annular member constitutes the side surface on the back side of the opening. Sealing device as described in.   The sealing device according to claim 1, wherein the sealing device is used for a differential side of a car.

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