JP3351634B2 - Bearing contact seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact seal for bearings used for bearings requiring strong water resistance such as bearings for electromagnetic clutches of car air conditioners.

[0002]

2. Description of the Related Art A bearing for an electromagnetic clutch of a car air conditioner is required to have high water resistance due to its characteristics. For example, a rolling bearing 50 using a contact seal 51 shown in FIG. 4 is used. The seal 51 has a ring shape in which a mandrel 52 is covered with an elastic body 53 such as rubber.
5, the seal lip portion 53 a on the inner peripheral side, which is a part of the elastic body 53, comes into sliding contact with the seal contact surface 56 a of the bearing inner ring 56.

[0003]

The water resistance of the bearing depends on the seal 51. However, due to the manufacture of the seal 51, irregularities such as burrs are formed on the leading edge 53aa of the seal lip 53a.
Since the uneven portion slides on the seal contact surface 56a of the inner ring 56, it is difficult to obtain sufficient water resistance. That is, although the molding of the seal 51 is performed using a split mold, FIG.
As shown in (B), the leading edge 5 of the seal lip portion 53a
3aa is the mold setting position P. The reason for setting the mold dividing position P is that if the mold is divided by another position, in the case of dividing into two parts, “forcible removal” is always performed for one of the molds. However, as described above, the leading edge 53aa of the seal lip 53a
If the mold is divided in such a manner, it is inevitable that irregularities such as burrs will be generated at that location. If burrs or the like are generated on the seal lip portion 53a, a small gap may be generated between the seal lip portion 53a and the bearing inner ring 56 when the seal lip portion 53a is assembled to the bearing 50, so that reliable water resistance may not be obtained.

An object of the present invention is to provide a contact seal for a bearing capable of improving water resistance irrespective of occurrence of burrs and the like.

[0005]

A contact seal for a bearing according to the present invention is obtained by covering a plate-shaped core with an elastic body by insert molding.
Te becomes, a ring-shaped seal for closing between the inner and outer rings of the rolling rising bearings, Sessu circumferential surface sliding of the inner ring of the elastic member
Cie Rurippu portion is based on the configuration provided extending in inclination direction with respect to the axis. In the bearing contact seal having this configuration, the seal lip extends vertically toward the inner diameter side.
And a cross-section that extends further inclining outward.
Te, the shape of the tip portion of the sheet Rurippu section, a shape having a cutout portion of the annular between the substantially vertical front end surface and the inner circumferential side of the inclined surface with the axis, and the front end surface of the core bar Same as inner surface
It is located on the surface .

[0006]

According to this structure, the portion where the seal lip slides on the inner ring is the leading edge of the inclined surface which becomes the opening edge of the cutout. It can be a position off the leading edge of the inclined surface that is the sliding contact point. For example, a tip end surface substantially perpendicular to the seal axis of the seal lip portion or a position in the notch portion can be set as the mold dividing position. In this case, the portion of the die where the notch is formed needs to be forcibly punched out of the molded product. Therefore, even if it becomes impossible to remove the mold, the mold can be removed without any trouble. In this way, the mold splitting position can be removed from the bearing sliding contact point of the seal lip, so that even if irregularities such as burrs occur at the mold splitting position, the seal lip always has a gap between the seal contact surface of the bearing. Without contact. Therefore, the water resistance is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1A shows a bearing for a car air conditioner electromagnetic clutch comprising a double-row angular contact ball bearing using the contact seal for bearing. In the bearing 1, double rows of rolling elements 5, 5 held by retainers 4 are interposed between the inner ring 2 and the outer ring 3, and the bearing contact seals 6 of this embodiment are provided near the width surfaces on both sides. Be composed. The outer diameter surface of the bearing inner race 2 has a seal contact surface 2a at an end in the width direction, and a portion between the raceway surface 2b and the seal contact surface 2a has a large diameter with a step relative to the seal contact surface 2a. The diameter is 2c.

[0008] The contact seal 6 for bearing is a plate-shaped mandrel 7.
The outer peripheral edge is attached to the seal mounting groove 9 of the outer ring 3 in a fitted state, and the inner peripheral seal lip portion 8a is attached to the inner ring. 2 in sliding contact with the seal contact surface 2a. The seal lip portion 8a is formed integrally with the elastic body 8. The bearing contact seal 6 has a substantially inward groove shape with respect to the bearing 1, and a seal lip portion 8 a extends from an inner end of an inner peripheral edge of the groove portion. The seal lip portion 8a has a rectangular cross section that extends vertically toward the inner diameter side and further extends obliquely outward.

The shape of the tip of the seal lip 8a is such that it has an annular notch 10 between the tip surface a perpendicular to the axis and the inclined surface b on the inner peripheral side. Notch 10
It has a cross-sectional shape in which the bottom surface is a cylindrical surface and the side surfaces are inclined surfaces that open to the inner diameter side. The tip surface a is the inner surface 7 of the mandrel 7
It is located on the same plane as a. By forming the cutout portion 10 in this manner, the leading edge c which is the innermost peripheral portion of the seal lip portion 8a becomes an opening edge portion of the inclined surface b with respect to the cutout portion 10. Seal lip 8 of bearing contact seal 6
a, a second lip 8b is provided extending from the vicinity of the proximal end to the inside of the bearing, and the distal end of the second lip 8b is provided on the large-diameter surface 2
The labyrinth seal is located near the end of the seal contact surface 2c on the side of the seal contact surface 2a.

A method for manufacturing the contact seal 6 for bearings will be described. As shown in FIG. 2, this contact seal 6 for bearings
It is formed by insert molding or the like by injection molding using a split mold 20 composed of an upper mold 21 and a lower mold 22. FIG. 2 shows the mold 20 standing upright for convenience of explanation. The mold dividing position Q between the upper mold 21 and the lower mold 22 is a plane on which the distal end surface a of the seal lip portion 8a and the bearing inner side surface 7a of the mandrel 7 are located. Therefore, the mold position Q
Is a position deviated from a leading edge c which is a sliding contact portion of the seal lip portion 8a with the bearing inner ring 2. When the die position Q is set in this manner, the notch 1
Although the mold portion for molding 0 is forcibly removed, this mold portion is in a small range, and since the molded product is an elastic body, even if forcibly removed, that is, the seal lip portion 8a
Can be easily removed without causing damage, deterioration, etc.

According to the bearing contact seal 6, since the annular notch 10 is provided at the tip of the seal lip 8a as described above, the mold splitting position Q is set at a position deviated from the tip edge c of the seal lip 8a. can do. Therefore, even if irregularities such as burrs occur during molding at the mold splitting position Q,
Burrs and the like do not occur on the tip edge c, and the uneven portion formed at the mold splitting position Q does not affect the contact with the bearing inner ring 2. for that reason,
When assembled in the bearing 1, a gap is prevented from being formed between the seal lip portion 8a and the seal contact surface 2a of the bearing inner ring 2, and the water resistance is improved. Since the bearing contact seal 6 has such excellent water resistance, satisfactory water resistance can be obtained even when used for a bearing for a car air conditioner electromagnetic clutch or the like, which requires strict water resistance. Note that the mold dividing position Q may be any position within the notch 10, and for example, FIG.
The position Q ′ shown in FIG.

FIG. 3 shows a contact seal 6 for a bearing according to this embodiment.
5 shows the results of a severe water resistance test for a bearing in which a bearing and a conventional contact seal 51 shown in FIG. 5 are assembled. Crosses indicate examples in which leakage occurred in the corresponding water supply cycle, and circles indicate examples in which no leakage occurred. From the figure, it can be seen that the water resistance of the conventional type was about 40 cycles, but the water resistance of this embodiment has been improved to 60 cycles or more. Note that one cycle of the water injection cycle was an operation in which water was injected for 0.5 minutes and then stopped for 4.5 minutes.

The bearing contact seal 6 according to the present invention comprises:
Not only angular contact ball bearings, but also deep groove ball bearings and roller bearings
Rolling bearings can be used generally.

[0014]

According to the contact seal for bearing of the present invention, in the contact seal for bearing provided with the seal lip portion of the elastic body extending in the inclined direction with respect to the axis, the shape of the tip of the seal lip portion is changed to the shaft. The annular notch is formed between the tip surface substantially perpendicular to the center and the inclined surface on the inner circumference side, so that burrs and the like are not generated at the tip edge of the seal lip, and the bearing inner ring is assembled at the time of assembly into the bearing. Alternatively, it is possible to prevent a gap from being formed between the bearing and the outer ring of the bearing. Therefore, the water resistance is improved.

[Brief description of the drawings]

FIG. 1A is a partial sectional view of a bearing using a contact seal for bearing according to an embodiment of the present invention, and FIG. 1B is a partially enlarged sectional view of the seal.

FIG. 2 is a sectional view showing the contact seal for bearing together with a mold.

FIG. 3 is a table showing a comparison between water resistance of an example and a conventional example.

FIG. 4A is a partial sectional view of a bearing using a conventional contact seal for bearing, and FIG. 4B is a sectional view of the contact seal for bearing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bearing, 2 ... Inner ring, 3 ... Outer ring, 5 ... Rolling element, 6 ... Bearing contact seal, 7 ... Core, 8 ... Elastic body, 8a ... Seal lip part, 10 ... Notch part, 21 ... Upper die, 22 ... lower mold, a ...
Tip surface, b: Inclined surface, c: Tip edge, Q: Molding position

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 33/72-33/82

Claims (1)

(57) [Claims] 1. An elastic body is inserted into a plate-shaped core by insert molding.
Coated becomes, the formed in a ring shape to close between the inner and outer rings of the rolling rising bearing, the inclination direction peripheral surface in sliding contact <br/> be Cie Rurippu portion of said inner ring of said elastic body for the axis Te contact seal odor bearing provided extends, said seal lip
Part extends vertically to the inner diameter side, and further extends to the outside inclined
Cross section rather have a Jijo, the shape of the tip portion of the front Symbol seal lip, a shape having a cutout portion of the annular between the substantially vertical front end surface and the inner circumferential side of the inclined surface to the axis, Front end face
Inner surface and the shaft BEARING contact seal is positioned on the same plane of Kikokoro gold.