JPH0645104Y2 - Shaft seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a shaft seal for sealing a rotating part, and more particularly to a shaft seal obtained by improving a fixed sealing structure.

[Prior Art] Conventionally, a shaft seal for sealing between a rotating member and a rotating member of this type is fitted and fixed to one member thereof, and a plurality of seal lips protruding in the radial direction and the axial direction are slid on the other member, respectively. Since they are brought into contact with each other for sealing, the mounting accuracy of the fixed portion of the housing has a great influence on the sealing performance, and has become an important part in design.

As this fixing structure, from the structure in which the outer peripheral portion of the shaft seal is simply fitted and fixed, in order to improve the mounting accuracy of the seal lip oriented in the axial direction, detailed description will be given with reference to the drawings. Similarly, a structure has been developed in which the flange 6 is formed on the reinforcing ring 3 and the flange 6 is brought into contact with and fixed to the end surface of the housing 1.

[Problems to be Solved by the Invention] However, if the flange 6 of the reinforcing ring 3 is brought into direct contact with the end surface of the housing 1, a problem remains in the sealing property. Therefore, the elastic sealing portion 4 is inserted between them. And
When this part receives a fitting input during mounting, it is largely deformed and press-fitted, making the fixing position extremely unclear. Therefore, in the case of the shaft seal having the seal lip 5 which is in contact with the radial direction as shown in FIG. 1, a desired contact position cannot be obtained, which is a serious drawback that greatly affects the sealing performance.

The present invention has been made in view of these drawbacks, and an object thereof is to provide a shaft seal having high mounting accuracy and good moldability.

[Means for Solving the Problems] The present invention, as shown in FIG. 1, includes a housing 1 and a rotary shaft 2.
A shaft seal comprising a metal-made reinforcing ring 3 for sealing the inside and the outside and a seal portion 4 made of an elastic body, which is interposed between the reinforcing ring 3 and the housing 1. Has a plurality of seal lips 5 protruding in the axial direction or the radial direction, and the housing 1 is provided on the outer peripheral portion of the reinforcing ring 3.
A flange 6 having a diameter larger than that of the mounting portion is provided, and the outer peripheral portion of the flange 6 is bent axially inward so as to be in contact with the end face of the housing 1 to form a protruding portion 7 in which a notch portion 9 is disposed. An annular projection 8 is provided on the inner diameter side of the protruding portion 7 and is continuous from the seal portion 4 and protrudes axially from the end surface of the protruding portion 7 by a compression dimension.

[Operation] When mounting the shaft seal having the above structure, as shown in FIG. 1, the shaft 6 is first inserted along the inner peripheral surface of the mounting portion of the housing 1, and the flange 6 comes into contact with the end surface of the housing 1 at the end. try to. At this time, the annular projection 8 provided on the flange 6 comes into contact with the end surface of the housing 1, and this is compressed and deformed by the pressing force so that the tip of the projecting portion 7 comes into contact next. However, since the projecting portion 7 is made of metal as described above and has rigidity higher than that of press fitting, the fitting operation stops here and the projecting portion 7 is fixed at a desired fixed position.

[Embodiment] In carrying out the present invention, since the annular projection 8 formed on the flange 6 of the reinforcing ring 3 is located on the inner peripheral side of the projecting portion 7, there remains a problem in the material filling property. It is also possible to form a plurality of cutouts 9 as shown in FIG. 2 and shape the shape of the elastic body which is in an unvulcanized state at the time of molding easily by passing through the cutouts 9. Further, as shown in FIG. 3, a plurality of uneven portions 10 protruding at intervals are formed in the radial portion provided on the protruding portion 7 and material passage is realized by the recessed portions of the protruding portions 10. Therefore, the moldability and the filling property are not deteriorated.

Further, the shape of the annular projection 8 is not limited to the one-piece special shape shown in FIG. 1, but it is also possible to form a plurality of projection stripes, for example.

[Advantage of the Invention] As described above, the annular protrusion 8 that contacts the end surface of the housing 1
Is sandwiched between the end face of the housing 1 and the flange 6 to maintain a high surface pressure, strongly adhere to each other, and exhibit a high sealing performance.

Further, since the fitting stop position of the shaft seal is determined by the end face of the projecting portion 7, it is possible to easily and extremely accurately mount it only by press fitting until it stops.

Due to this accurate mounting position, the seal lip 5 protruding to the side can obtain an optimum sliding pressure, and the effect on the sealing performance and the durability becomes extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the shaft seal of the present invention. 2 and 3 are partial side views showing an embodiment of the reinforcing ring used in the present invention. FIG. 4 is a sectional view of a conventional shaft seal. 1 ... Housing, 2 ... Rotating shaft, 3 ... Reinforcing ring, 4 ... Seal part, 5 ... Seal lip, 6 ... Flange, 7 ... Projection part, 8
... annular protrusion, 9 ... notch, 10 ... uneven part

Claims (3)

[Scope of utility model registration request] 1. A shaft seal comprising a metal reinforcing ring 3 and an elastic seal portion 4 interposed between a housing 1 and a rotary shaft 2; said reinforcing ring 3 being attached to the housing 1 and sealing portion. Reference numeral 4 denotes a seal lip 5 projecting in the axial direction or the radial direction, a flange 6 having a diameter larger than that of the mounting portion of the housing 1 is provided on the outer peripheral portion of the reinforcing ring 3, and the outer peripheral portion of the flange 6 is arranged in the axial direction. A protruding portion 7 is formed by bending or protruding inward, and an annular protrusion 8 is provided on the inner diameter side of the protruding portion 7 and is continuous from the seal portion 4 and axially protrudes from the end surface of the protruding portion 7. And shaft seal. 2. A shaft seal according to claim 1, wherein a cutout portion 9 is formed in the projecting portion 7. 3. The shaft seal according to claim 1 or 2, wherein a plurality of concave and convex portions are formed on a radial portion provided on the protruding portion 7.