JPH0519740U - Oil seal protector - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] When installing the oil seal, prevent the oil seal lip from inverting and ensure easy assembly with the rotary shaft of the oil seal. To provide a protector for an oil seal which can be used. An oil seal protector 17 mounted on the sealing side of an oil seal having a mounting portion 5 mounted on a housing 6 and a lip portion 7 pressed against a rotating shaft 9, wherein the protector is a support portion mounted on the oil seal. 18 and a flange portion 19 extending from the upper end of the support portion on the sealing side toward the center of the rotary shaft, and the inner peripheral end portion 20 of the flange portion is expanded in diameter toward the axial sealing side. It is characterized in that an inclined surface 22 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil seal protector attached to an oil seal, which is known as a type of sealing device, and particularly prevents lip reversal when inserting the oil seal into the shaft and improves the mountability on the rotating shaft. The present invention relates to a protector for an oil seal.

[0002]

[Prior Art]

 Generally, an oil seal is often used to prevent leakage of lubricating oil from the bearings of rotating shafts and reciprocating shafts. It is known that an annular protector having a substantially L-shaped cross section is fitted and mounted on the sealing side of the oil seal in order to prevent the lip reversal when the oil seal is inserted into the shaft.

FIG. 5 shows a main part of a general type of such a conventional oil seal 1, which is formed by an annular seal body 2 having a substantially U-shaped cross section. The seal body 2 is made by integrally molding a rubber-like elastic body 4 on an annular reinforcing ring 3 made of metal or the like having a substantially L-shaped cross section. The oil seal 1 is configured such that the mounting portion 5 formed of the outer peripheral portion of the seal body 2 is fitted to the inner peripheral surface of the housing 6 with an appropriate tightening allowance, and the rubber-like elastic body 4 is the inner peripheral portion of the seal body 2. The lip portion 7 formed by the above is pressed against the outer peripheral surface of the rotating shaft 9 by the tightening force of the garter spring 8 mounted on the outer peripheral portion thereof to prevent the leakage of lubricating oil or the like on the sealing side O. The dust lip 10 is pressed against the outer peripheral surface of the rotating shaft 9 to prevent dust and foreign matter from the atmosphere side A from entering the oil seal 1.

To further explain, the lip portion 7 and the dust lip 10 are in the state of solid lines in FIG. 5 in the free state, and are pressed against the outer peripheral surface of the rotating shaft 9 with the tightening margins Sa and Sb, respectively.

In the oil seal 1, the lip portion 7 of the oil seal 1 is inserted from the insertion end 15 of the rotary shaft 9 shown by the alternate long and short dash line in FIG. When the oil seal 1 is mounted while being pressed into the predetermined position of 6, it is difficult to make the central axis of the oil seal 1 coincide with the central axis of the rotating shaft 9, and the lip portion 7 of the oil seal 1 is inverted. Therefore, it took a lot of skill to attach the oil seal 1.

Therefore, in order to prevent the lip portion 7 of the oil seal 1 from being inverted, as shown in FIG. 6, a protector 11 made of metal having an annular shape and a substantially L-shaped cross section is provided on the reinforcing ring 3. It is proposed to be attached inside. That is, the distance D between the inner peripheral end surface 13 of the flange portion 12 extending toward the center of the rotary shaft 9 of the protector 11 and the rotary shaft 9 is set to about 1 mm, and the inner peripheral end surface 13 prevents the oil seal 1 from rotating. The oil seal 1 is mounted in a predetermined position while suppressing a large inclination of the center shaft with respect to the rotating shaft 9.

[0007]

[Problems to be solved by the device]

 However, in the oil seal 1 provided with the conventional protector 11 described above, since the inner peripheral end surface 13 of the flange portion 12 of the protector 11 is a surface parallel to the outer peripheral surface of the rotating shaft 9, the rotating shaft When attempting to insert the oil seal 1 provided with the protector 11 from the insertion end 15 of the shaft 9 in the direction of the thick arrow in the figure, the corner 14 of the inner peripheral end face of the protector 11 causes the oil seal 1 to be inserted into the insertion end 15 of the rotary shaft 9. 1 will be opposed to the chamfered portion 16 provided as a guide portion when inserted, and the corner 14 of the inner peripheral end surface of the protector 11 and the insertion end 15 of the rotating shaft 9 will be provided when inserting into the rotating shaft 9. The chamfered portion 16 comes into contact and chatter or the like occurs, which prevents smooth insertion, resulting in poor workability in assembling the oil seal 1 with the rotating shaft 9, resulting in poor workability and in the protector 11. There is a problem that it requires concentricity precision of the rotation shaft 9 on the peripheral edge surface 13.

The present invention overcomes the above-mentioned problems in the conventional one, reliably prevents the inversion of the lip portion of the oil seal when installing the oil seal, and simplifies the assembling of the oil seal with the rotating shaft. The purpose of the present invention is to provide an oil seal protector with a simple structure that can be easily implemented.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the protector for an oil seal of the present invention is an protector for an oil seal which is mounted on the sealing side of an oil seal having a mounting part for a housing and a lip part pressed against a rotating shaft. The protector has a support part to be attached to the oil seal and a flange part extending from the upper end on the sealing side of the support part toward the center of the rotary shaft, and the axial direction is provided at the inner peripheral end part of the flange part. It is characterized in that an inclined surface whose diameter is expanded toward the opposite sealing side is provided.

[0010]

[Action]

 According to the oil seal protector of the present invention having the above-described configuration, when the oil seal is mounted on the rotary shaft, the chamfered portion provided as a guide portion at the insertion end of the rotary shaft and the seal side of the oil seal are provided. The inclined surface provided on the inner peripheral end surface of the installed protector faces in an inclined state, and the mutual alignment effect prevents the rotary shaft from being greatly inclined with respect to the oil seal. It can be installed smoothly and the assemblability can be improved, and the lip reversal of the oil seal can be reliably prevented by using the protector.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. It should be noted that the same or corresponding configurations as those of the above-described conventional one are denoted by the same reference numerals in the drawings, and the description thereof will be omitted.

FIG. 1 shows a first embodiment in which a protector 17 for an oil seal according to the present invention is mounted on a conventional oil seal 1, and both a mounting portion 5 on a housing 6 and a lip portion 7 are rubber-like elastic. This is applied to the oil seal 1 integrally formed with the reinforcing ring 3 by the body 4.

The oil seal protector 17 in this embodiment is formed in a substantially L-shaped cross section in which a cylindrical support portion 18 and a flange portion 19 extending toward the center of the rotary shaft 9 are connected in series. A rotary shaft guide portion 21 is vertically formed on the inner peripheral end surface 20 of the flange portion 19 in the direction of the rotary shaft 9 toward the sealing side O. The internal dimension of the rotary shaft guide portion 21 is provided with an appropriate distance D from the rotary shaft 9. The end surface of the rotary shaft guide portion 21 on the sealing side O facing the rotary shaft 9 is provided with an appropriate tilt angle β with respect to the tilt angle α of the chamfered portion 16 provided at the insertion end 15 of the rotary shaft 9. An inclined surface 22 having an appropriate length is provided so as to increase the distance from the appropriate position of the rotary shaft guide portion 21 toward the sealing side O and the rotary shaft 9. The oil seal protector 17 is made of metal, but is preferably made of a material that does not damage the rotary shaft 9 when it comes into contact with the rotary shaft 9, such as resin. As the resin material, various types such as nylon type, phenol type, polyamide type, etc., which are not affected by the object to be sealed, can be appropriately selected.

Further, the oil seal protector 17 may be mounted by fitting the support portion 18 on the inner peripheral side of the reinforcing ring 3 of the oil seal 1 or by further bonding the both.

Next, the operation of this embodiment having the above-mentioned configuration will be described.

According to the oil seal 1 equipped with the oil seal protector 17 of the present invention having the above-described structure, when the oil seal 1 is mounted at a predetermined position in the housing 6, the insertion end of the rotary shaft 9 is inserted. A chamfered portion 16 provided as a guide portion in 15 is inserted from the end surface on the sealing side O of the inclined surface 22 of the rotary shaft guide portion 21 provided on the inner peripheral end surface 20 of the flange portion 19 of the oil seal protector 17. Therefore, the chamfered portion 16 of the rotary shaft 9 and the inclined surface of the oil seal protector 17 can start the insertion of the rotary shaft 9 into the oil seal 1 with a wide tolerance. Immediately after the start of insertion, the chamfered portion 16 of the rotary shaft 9 and the inclined surface of the oil seal protector 17 serve as a guide to insert the oil seal 1 into the rotary shaft 9 while aligning each other. It can be done smoothly. Further, the inner peripheral end surface 20 of the oil seal protector 17 prevents the central axis of the oil seal 1 from being largely inclined with respect to the rotating shaft 9, while surely preventing the inversion of the lip portion 7 and the oil seal 1 and the rotating shaft. 9 can be mounted.

Further, in this case, if the oil seal protector 17 is formed of a material such as a resin material that does not damage the rotary shaft, the inclined surface 22 of the oil seal protector 17 when the oil seal 1 and the rotary shaft 9 are mounted. Further, even if the inner peripheral end surface 20 comes into contact with the outer peripheral surface of the rotary shaft 9, the rotary shaft 9 is not damaged at all, and the guide performance of the oil seal protector 17 is improved. Therefore, the work of installing the oil seal 1 can be performed easily and quickly, and the workability of assembling can be improved.

FIG. 2 shows a second embodiment of the oil seal protector 17 according to the present invention. In this embodiment, the flange portion 19 of the first embodiment described above is sealed with the inner peripheral end face 20. The inclined surface 22 is formed by bending so as to expand the diameter to the side O. The other structure is the same as that of the first embodiment.

According to this embodiment having such a configuration, the same effects as those of the above-described first embodiment can be obtained, the inclined surface 22 can be easily formed, and the manufacturing cost can be reduced. You can

FIG. 3 shows a third embodiment of the oil seal protector 17 according to the present invention. In this embodiment, an inclined surface is formed within the plate thickness of the inner peripheral end surface 20 of the first embodiment described above. 22 is formed. Other configurations are similar to those of the first embodiment.

According to this embodiment having such a configuration, the same effects as those of the first embodiment described above are obtained, and the inclined surface 22 can be formed more easily than in the second embodiment. .. Further, since there is no protruding portion on the outer side of the oil seal 1 in the axial direction, it is easy to arrange the oil seal 1 with the protector 17 stacked and stored, and to prevent damage due to the protruding portion when handling by hand. It is possible to improve the handleability.

FIG. 4 shows a fourth embodiment of the oil seal protector 17 according to the present invention. In this embodiment, the flange portion 19 of the first embodiment described above is located on the atmosphere side A from an appropriate position. The inclined surface 22 is formed by bending so as to reduce the diameter. The other structure is the same as that of the first embodiment.

According to this embodiment having such a configuration, the same effects as those of the above-described first embodiment can be obtained, the manufacturing cost can be reduced, and the oil seal 1 projects outward in the axial direction. Since there is no part, it is easy to arrange the oil seals 1 equipped with the protector 17 when they are stacked and stored, and when handling by hand, it is possible to prevent damage due to the protruding parts and improve handling properties. it can.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

For example, the shape of the supporting portion may be a two-step cylindrical shape provided with a reduced diameter portion, and the length of the supporting portion that contacts the mounting portion on the oil seal 1 may be shortened.

[0026]

[Effect of the device]

 As described above, according to the oil seal protector of the present invention, the assembling property of the oil seal and the rotary shaft can be improved with a simple structure, and the oil seal and the rotary shaft can be assembled together. It is possible to reliably prevent the lip portion of the oil seal from rotating.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of essential parts showing a first embodiment in which an oil seal protector according to the present invention is attached to an oil seal.

FIG. 2 is a vertical sectional side view of an essential part showing a second embodiment of the present invention.

FIG. 3 is a view similar to FIG. 2 showing a third embodiment of the present invention.

FIG. 4 is a view similar to FIG. 2 showing a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional side view of an essential part showing an example of a conventional oil seal.

FIG. 6 is a vertical cross-sectional side view of essential parts showing a conventional example in which a conventional oil seal protector is attached to an oil seal.

[Explanation of symbols]

 1 Oil seal 2 Seal body 3 Reinforcement ring 5 Mounting part 6 Housing 7 Lip part 9 Rotating shaft 15 Insertion end 16 Chamfering part 17 Oil seal protector 18 Support part 19 Flange part 20 Inner peripheral end face 21 Rotating shaft guide part 22 Inclined surface

Claims (1)

[Scope of utility model registration request] 1. An oil seal protector mounted on the sealing side of an oil seal having a mounting part on a housing and a lip part pressed against a rotating shaft, wherein the protector is a supporting part mounted on the oil seal, and a supporting part. A flange portion extending from the upper end on the sealing side of the portion toward the center of the rotary shaft, and an inner peripheral end portion of the flange portion is provided with an inclined surface whose diameter is expanded toward the sealing side in the axial direction. A protector for oil seals.