JPH066752U - Bearing sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] A shield plate suitable for mass production is provided, which is capable of engaging in correspondence with variations in accuracy of the locking groove of the outer ring and has appropriate rigidity, and has relatively low manufacturing cost. It is characterized by that. [Structure] The outer ring 1 or the engaging portions 8 and 12 of the shield plates 7 and 11 with the outer ring 1 or the outer ring 1 and the inner ring 5 are made of a relatively soft synthetic resin, and the other portions 9 are made of a relatively hard synthetic resin. . Even if there are variations in the shape of the locking groove, the engaging portions 8 and 12 that are elastically deformed can reliably engage with each other, and the other portions have appropriate rigidity, so that they are not deformed or curved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device for a bearing, particularly a sealing device for a small rolling bearing.

[0002]

[Prior art]

 Conventionally, as an example of this type of bearing sealing device, there is one used for bearings for miniatures and office equipment. The structure of the fitting portion of this sealing device will be described with reference to the sectional view of the portion shown in FIG. In the figure, at both end portions (only one is shown) of the inner peripheral surface 1a facing the inner ring (not shown) of the outer ring 1, cross-section substantially V-shaped engaging with the outer peripheral engaging portion 2a of the annular shield plate 2 is shown. Shaped engagement groove 1b is formed. The outer peripheral engaging portion 2a of the shield plate 2 is formed in a substantially V-shaped cross section, and is provided with a tapered outer peripheral end surface 2b and an annular groove 2c formed on the surface opposite to the end surface 2b. . The shield plate 2 is made of synthetic resin, and the outer peripheral engagement portion 2a can be elastically deformed when fitted. Particularly, the tip portion 2d of the outer peripheral end surface 2b is elastically deformed to be locked in the engagement groove 1b.

When the shield plate 2 is attached to the outer ring 1 with the above-mentioned configuration, the outer peripheral end surface 2b of the shield plate 2 is brought into contact with the outer peripheral end 1c of the locking groove 1b, and the shield plate 2 is further pressed. Then, the outer peripheral engaging portion 2a elastically deforms and bends, and after being fitted into the engaging groove 1b, the outer peripheral engaging portion 2a is engaged with the engaging groove 1b particularly when the tip portion 2d tries to recover due to its own elasticity. Be stopped.

[0004]

[Problems to be solved by the device]

 By the way, in order to keep the fitting ability between the outer ring 1 and the shield plate 2 high and prevent the shield plate 2 from falling off, it is necessary to maintain the accuracy of the engaging groove 1b and the outer peripheral engaging portion 2a. However, the cutting shape accuracy of the locking groove 1b of the outer ring 1 which is generally made of iron or the like is not at a sufficient level to satisfy this, and therefore only the molding accuracy of the outer peripheral engagement portion 2a of the shield plate 2 is sufficient. It is not possible to maintain the proper fitting ability. On the other hand, when a softer synthetic resin is used as the material of the shield plate 2, the elasticity is increased, so that even if the molding precision of the locking groove 1b varies, it is possible to maintain a sufficient fitting ability. Like However, in this case, the rigidity of the shield plate 2 as a whole becomes smaller this time, so that other portions may be projected or deformed outward from between the outer ring and the inner ring, which may impair the function of the bearing.

In order to improve this, as shown in FIG. 9, there is also one which is formed so that the reinforcing metal plate 3 and the like are located on the inner surface of the central portion of the shield plate 2. However, such a structure raises the manufacturing cost and is not suitable for mass production.

In view of such a problem, the present invention has a bearing sealing device that includes a shield plate that can cope with variations in accuracy of the locking groove of the outer ring and that has appropriate rigidity and that is relatively inexpensive to manufacture. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 The bearing sealing device according to the present invention has an outer ring having a locking groove having a substantially V-shaped cross section formed at an end portion on the inner peripheral surface side, and an elastic member having a tapered end surface and capable of being engaged with the locking groove. A bearing sealing device comprising a deformable outer peripheral engagement portion and an annular synthetic resin shield plate fitted between an outer ring and an inner ring, the outer ring of the shield plate or the outer ring and the inner ring. It is characterized in that the engaging portion with is made of a relatively soft synthetic resin and the other portions are made of a relatively hard synthetic resin.

[0008]

[Action]

 When mounting the shield plate, if the tapered end surface of the shield plate is brought into contact with the locking groove and pressed against it, the outer peripheral engaging part is relatively soft and elastically deforms, and then securely engages with the locking groove. Moreover, since the rigidity is high except for the engaging portion of the shield plate, it does not project or deform from the outer ring and the inner ring.

[0009]

【Example】

 A preferred embodiment of the present invention will be described below with reference to FIG. 1, but the same parts as those of the above-described conventional art are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 shows a sectional view of a main part of a rolling ball bearing, in which a ball 6 is held between an outer ring 1 and an inner ring 5. An inner ring non-contact type shield plate 7 is fitted in locking grooves 1b (only one of which is shown) formed at both end portions of the outer ring 1.

The shield plate 7 includes a fitting portion 8 made of a relatively soft synthetic resin that constitutes a portion that engages with the locking groove 1b of the outer race 1, and a portion that is not in contact with the outer race 1 and the inner race 5. It is configured by forming a different material with the constituent shield portion 9 made of a relatively hard synthetic resin. Here, the fitting portion 8 has a tapered outer peripheral end surface 8b ', a tip portion 8f, and an annular groove 8c on a substantially V-shaped outer peripheral engaging portion 8a that fits in the locking groove 1b as in the above-described conventional technique. Each of them is formed, and a recess 8d is formed at the other end. Further, at one end of the shield portion 9, a convex portion 9a that fits into the concave portion 8d is formed. The concave portion 8d and the convex portion 9a may be formed so as to be opposite to each other.

For example, an elastomer is used as the material of the fitting portion 8, and the material of the shield portion 9 has higher heat resistance (for example, 130 ° C. or higher) and oil resistance than the elastomer, for example, 66 nylon. A reinforced grade shall be used. Note that other appropriate materials may be adopted. Further, in the shield plate 7, first, the shield part 9 is formed, then the generated shield part 9 is placed in the mold of the shield plate 7, and the synthetic resin in the fitting part 8 is injected. Different material is molded.

Since the present embodiment is configured as described above, in order to attach the shield plate 7 to the outer ring 1, the outer peripheral end face 8b of the fitting portion 8 is attached to the outer peripheral end of the locking groove 1b as in the prior art. If the outer peripheral engaging portion 8a is elastically deformed and pushed into the locking groove 1b by abutting against and pressing against 1c, even if there is some variation in the shape accuracy of the locking groove 1b, it will be affected by its own elasticity. It is securely engaged with the inner wall of the stop groove 1b. In addition, in the engaged state, the shield portion 9 has higher rigidity than the fitting portion 8, so that the shield portion 9 will not be deformed outward by heat, oil, or the like when the bearing is used, and will not be projected outward.

As described above, according to the present embodiment, since the fitting portion 8 of the shield plate 7 is relatively soft, it can be reliably engaged even if there is some variation in the shape accuracy of the locking groove 1b. In addition, since the shield part 9 is harder and has higher rigidity than the fitting part 8, it does not deform or project when the bearing is used, and does not adversely affect the function of the bearing. Further, since the shield plate 7 can be integrally formed by molding different materials, the number of parts and the number of assembling steps at the time of manufacturing do not increase, and the increase in manufacturing cost can be suppressed.

2 and 3 show a modification of the shield plate 7 of the first embodiment. In FIG. 2, the cross section of the joint surface between the fitting portion 8 and the shield portion 9 is arcuate, and FIG. 3 is planar. Such a joining method can be adopted when the two have a good affinity. Needless to say, the shape of the joint surface of both members may be any other suitable shape.

FIGS. 4 to 6 show examples of outer peripheral fitting portions 8 a ′ having different shapes in the fitting portion 8 of the shield plate 7, each having a step portion 8 e and a tapered outer peripheral end surface 8 b. It is designed to be elastically deformable. The shapes of the bonding surfaces in FIGS. 4 to 6 correspond to those in FIGS. 1 to 3, respectively.

Next, FIG. 7 shows an inner ring contact type shield plate 11 that engages with both the outer ring 1 and the inner ring 5. The shield plate 11 is used to seal the lubricating oil or the like between the outer ring 1 and the inner ring 5. In the figure, a contact portion 12 which is held in contact with the inner ring 5 is joined to a joint surface of the shield portion 9 opposite to the fitting portion 8. The contact portion 12 is made of the same synthetic resin as that of the fitting portion 8, and the shape of the joint surface with the shield portion 9 is also the same as that of the fitting portion 8. The joint surface of the shield plate 11 may have the joint surface shape shown in FIG. 2 or 3. Further, the fitting portion 8 having the shape shown in FIGS. 4 to 6 may be adopted.

[0017]

[Effect of device]

 As described above, in the bearing sealing device according to the present invention, the outer ring of the shield plate or the engaging portion with the outer ring and the inner ring is made of a relatively soft synthetic resin, and the other portions are made of a relatively hard synthetic resin. Therefore, even if there is variation in the shape accuracy of the locking groove of the outer ring, the shield plate can be reliably engaged, and other parts do not deform or project outward, and the bearing Does not adversely affect functions and the like. Moreover, it is suitable for mass production because it can suppress an increase in manufacturing cost without increasing the number of parts and the number of assembly steps.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a first embodiment of a bearing sealing device according to the present invention.

FIG. 2 is a view showing a modified example of the shield plate according to the present invention.

FIG. 3 is a diagram showing another modification of the shield plate.

FIG. 4 is a view showing another shield plate having a different outer peripheral engagement portion.

FIG. 5 is a diagram showing a modification of the shield plate of FIG.

FIG. 6 is a diagram showing another modification of the shield plate of FIG.

FIG. 7 is a view showing an example of an inner ring contact type shield plate.

FIG. 8 is a sectional view of a main part of a conventional bearing sealing device.

FIG. 9 is a cross-sectional view of essential parts showing another example of a conventional bearing sealing device.

[Explanation of symbols]

 1 Outer ring 1b Locking groove 7,11 Shield plate 8 Fitting part 8a Outer peripheral engagement part 8b Outer peripheral end face 9 Shield part 12 Contact part

Claims (1)

[Scope of utility model registration request] 1. An outer ring having an engaging groove having a substantially V-shaped cross section formed at an end portion of an inner peripheral surface thereof, and an elastically deformable outer periphery having a tapered end surface and engageable with the engaging groove. In a bearing sealing device, comprising: an annular synthetic resin shield plate that is formed with an engaging portion and can be fitted between an outer ring and an inner ring;
A bearing sealing device, wherein the outer ring of the shield plate or the engaging portion with the outer ring and the inner ring is made of a relatively soft synthetic resin, and the other portions are made of a relatively hard synthetic resin.