JPH0732985Y2 - Bearing seal plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a seal plate used for a seal type bearing, and more particularly to a plastic seal plate used for a miniature bearing or a medium size bearing.

(Prior Art) In recent years, in the fields of office equipment, home appliances, etc., the bearings used therefor have tended to become smaller and smaller, and the outer diameter of the outer ring has become smaller. For example, many ultra-small sealed bearings with a size of a few millimeters are used.

Therefore, in the ultra-compact bearing with an outer diameter of a few millimeters, the inner and outer rings are extremely thin, and the distance from the side surface of the inner and outer rings to the retainer is also extremely short. The use of a metal seal plate has become almost impossible, and a plastic seal plate has been used instead.

Conventionally, as a sealing plate made of this kind of plastic, for example, one having a structure disclosed in Japanese Utility Model Publication No. 60-12719 is known.

That is, as shown in FIG. 8, the sealing plate 7 has an insertion inclined surface 7a and an outer inclined surface 7b formed on both ends of the outer peripheral surface, and an annular raised portion 7c formed on the inner surface of the outer peripheral edge. Yes,
When this seal plate 7 is pressed and its outer peripheral edge portion is fitted into the locking grooves 9 formed at both ends of the inner peripheral surface of the outer ring 8, as shown in FIG. The outer side inclined surface 7b is pressed against the outer side surface 9b of the locking groove 9 by the elastic force of the side surface 9a.

As a result, the sealing plate 7 is tightly fitted in the locking groove 9 even if the processing accuracy of the locking groove 9 varies, and the inner and outer rings 8, 10
It will seal the gap between them.

(Problems to be solved by the invention) However, in the conventional seal plate 7, the raised portion 7c is formed substantially vertically on the inner side surface of the seal plate 7, and the raised portion 7c is formed.
Since it itself is formed to be relatively thick, a large compressive stress is generated in the raised portion 7c when it is fitted into the locking groove 9, and the sealing plate 7
A force is generated that pushes outward.

As a result, when the seal plate 7 expands due to the temperature change of the environment in which the bearing is used, or when the seal plate 7 itself absorbs moisture in the lubricating oil and expands, the compressive stress generated in the raised portion 7c causes There has been a problem that the seal plate 7 itself is largely curved outward, and a part of it protrudes outward from the side surface of the bearing.

Further, since the raised portion 7c is formed on the inner side surface 9a of the seal plate 7, if the seal plate 7 is pressed into the locking groove 9 too much, the raised portion 7c may be damaged or become large. There is a problem that the seal plate 7 may be distorted, and as a result, the seal plate 7 is easily rattled during use.

Further, when the raised portion 7c is formed substantially vertically on the inner surface of the seal plate 7, the raised portion 7c bends inward of the seal plate 7 when the seal plate 7 is fitted into the locking groove 9. Or, it may be bent outward, and when the seal plate 7 is fitted in the locking groove 9, the bending direction of the raised portion 7c may be different. As a result, the sealing property may be impaired. However, since the raised portion 7c abuts the inner peripheral surface of the locking groove 9 in a substantially line contact state, the sealing property is further reduced.

The present invention was devised in order to solve the above problems, and the purpose thereof is to be able to absorb the above-mentioned error at the time of fitting into the locking groove even if an error occurs in the processing accuracy of the locking groove of the outer ring. Also, even if it expands due to temperature change or absorption of water during use, it fits into the locking groove of the outer ring in a good posture, and further, damage and distortion at the time of fitting into the locking groove can be prevented, It is still another object of the present invention to provide a bearing seal plate that can improve the sealing performance.

(Means for Solving the Problem) In the present invention, a cross-sectional shape consisting of a vertical inner side surface 6a formed at both ends of the inner peripheral surface of the outer ring 2, a bottom surface 6b, and an outer side surface 6c inclined outward is substantially U. A plastic bearing seal plate in which the outer peripheral edge portion is fitted into the ring-shaped annular locking groove 6 so as to elastically engage the inner and outer surfaces 6a and 6c of the locking groove 6. In this case, a protrusion 1c having a substantially trapezoidal cross section is formed in an annular shape on the inner surface of the outer peripheral edge of the seal plate 1, and the flat top surface of the protrusion 1c is formed on the inner surface 6a of the locking groove 6. Make contact in the state of surface contact and insert the inclined surface on the outer peripheral side
1a, and on the outer surface of the outer peripheral edge portion of the seal plate 1, an outer inclined surface 1b facing in parallel to the outer surface 6c of the engaging groove 6 in order from the outer peripheral side to the inner peripheral side, and the engaging groove 6 A thin annular ridge 1d having a substantially triangular cross-section that comes into contact with the outer side surface 6c in a bent state, and an annular recess 1e that facilitates elastic bending of the ridge 1d.
Is formed as the basic configuration of the invention.

(Operation) When the seal plate is mounted on the bearing, the seal plate is applied to the side surface of the outer ring in a posture in which the protrusion faces the ball side, and the outer peripheral edge portion is uniformly pressed inward. Then, the seal plate bends reasonably due to its elasticity, and then its outer peripheral edge portion is fitted into the locking groove of the outer ring.

At this time, the protrusion formed on the inner side surface of the seal plate engages with the inner side surface of the locking groove in a surface contact state to regulate the pushing amount, prevent foreign matter from entering and lubricating oil from leaking, and The raised portion formed on the outer peripheral edge of the seal plate comes into contact with the outer surface of the locking groove in a bent state, for example, to prevent rattling with the outer ring due to its elastic force and prevent foreign matter from entering and lubricating oil from leaking. To prevent.

Since the raised portion of this seal plate projects toward the outer surface of the seal plate and is in contact with the outer surface of the locking groove, compressive stress is applied to the raised portion when the seal plate is fitted into the locking groove. Even if it occurs, almost no force is generated to push the seal plate itself outward.

As a result, even if the sealing body itself expands due to temperature change or absorption of moisture and a large compressive stress is generated in the raised portion, the sealing plate does not bend greatly outward, and a good posture is maintained in the locking groove. Fitted and held.

Further, since the protrusion of the seal plate has a substantially trapezoidal sectional shape, the amount of pushing is restricted by the protrusion when fitted.

As a result, even if the pressing force applied to the seal plate at the time of fitting is excessively large, the seal plate is not partially crushed, and the seal plate is not damaged or distorted.

Furthermore, in the seal plate, the protrusion makes surface contact with the inner surface of the locking groove,
Moreover, since the outer peripheral edge portion of the seal plate is pressed into the locking groove by the elastic force of the raised portion, the sealing property is significantly improved. However, since the ridge is provided so as to project toward the outer surface of the seal plate, when the seal plate is fitted into the locking groove, the ridge always bends in the same direction, impairing the sealing performance. It will not be

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a partially enlarged sectional view of a bearing equipped with the seal plate 1 according to the first embodiment of the present invention, in which 2 is an outer ring and 3
Is an inner ring, 4 is a ball, and 5 is a retainer.

An annular locking groove 6 having a substantially inverted U-shaped cross section is formed at both ends of the inner peripheral surface of the outer ring 2, and the locking groove 6 has a vertical inner surface 6a and a flat bottom surface 6b. And an outer side surface 6c inclined outward.

The seal plate 1 is formed into an annular shape by integral molding of engineering plastic having excellent heat resistance and wear resistance and having appropriate elastic force, and an inclined surface 1a for insertion is formed on the inner peripheral portion thereof. Outer inclined surfaces 1b facing the outer surface 6c of the locking groove 6 in parallel with each other are formed on the outer peripheral outer portions.

Then, the protrusion 1c having a substantially trapezoidal cross section is fitted to the inner surface of the outer peripheral edge portion of the seal plate 1 in surface contact with the inner surface 6a of the locking groove 6.
Is formed in a ring shape. The protrusion 1c has a flat top surface and an outer peripheral surface serving as an insertion inclined surface 1a.

Further, on the outer peripheral edge portion of the seal plate 1, a thin-walled ridge portion 1d is formed in an annular shape, which protrudes toward the outer side surface of the seal plate 1 and contacts the outer side surface 6c of the locking groove 6 in a bent state. This ridge
1d is formed in a pointed shape and is shaped along the axis of the seal plate 1, and its outer peripheral surface is continuous with the outer inclined surface 1b and is parallel to the axis of the seal plate 1.

Further, an annular recess 1e is formed in a position near the inner peripheral surface of the raised portion 1d in order to facilitate bending of the raised portion 1d.

The seal plate 1 of this embodiment has a thickness of about 0.35 mm,
The outer diameter is set to about 9 mm, and the inner peripheral edge is formed thick. The inner diameter of the seal plate 1 is set so that there is a very small gap between it and the outer peripheral surface of the inner ring 3 when the seal plate 1 is fitted into the locking groove 6, and the outer diameter of the seal plate 1 is also set to the locking groove. It is set so that a slight gap is formed between the engaging groove 6 and the bottom surface of the engaging groove 6 when fitted.

Thus, when mounting the seal plate 1 on the bearing, first, the inclined surface 1a for insertion is applied to the inner peripheral edge portion of the side surface of the outer ring 2, and the outer peripheral edge portion is uniformly pressed inward.

Then, the seal plate 1 bends reasonably due to its elasticity, and then its outer peripheral edge portion is fitted into the locking groove 6 of the outer ring 2.

That is, as shown in FIG. 2, in the seal plate 1, the protruding portion 1c abuts the inner side surface 6a of the locking groove 6 in a surface contact state, and
1d comes into contact with the outer surface 6c of the locking groove 6 in a bent state, and the ridge 1d
It is tightly and firmly fitted into the locking groove 6 by the elastic force of.

Since the thin ridge 1d of the sealing plate 1 projects toward the outer surface of the sealing plate 1 and is in contact with the outer surface of the locking groove 6, the sealing plate 1 is fitted into the locking groove 6. However, almost no force is generated to push the seal plate 1 itself outward, and the compressive stress generated in the raised portion 1d is also small.

As a result, even if the seal plate 1 itself expands due to a temperature change or absorption of moisture, the seal plate 1 is not greatly bent outward, and is fitted and held in the locking groove 6 in a good posture.

Further, when the seal plate 1 is fitted in the locking groove 6, the pushing amount is restricted by the substantially trapezoidal projection 1c, so that even if the pressing force applied to the temporary seal plate 1 becomes excessive, 1 is not crushed partially, and the seal plate 1 is not damaged or distorted.

Further, since the protrusion 1c of the seal plate 1 is fitted in the locking groove 6 in a surface contact state, and the raised portion 1d of the seal plate 1 is bent and is in contact with the locking groove 6, the sealing performance is improved. It is possible to significantly improve and prevent rattling with the outer ring 2. However, since the protrusion 1d is provided so as to project toward the outer side surface of the seal plate 1, when the seal plate 1 is fitted into the locking groove 6, the protrusion 1d always bends in the same direction. The sealing property is not impaired.

Moreover, since the outer peripheral edge portion and the inner peripheral edge portion of the seal plate 1 are relatively thick, the strength is not significantly deteriorated, and the flow of the molten resin is smooth during the injection molding to improve the workability. It is extremely good and the number of defective products is reduced.

In addition, the outer peripheral edge of the seal plate 1 has an inner surface 6a of the locking groove 6.
Since the outer ring 6 is fitted only to the outer surface 6c, a large force does not act on the outer ring 2 in the radial direction, and as a result, the outer ring 2 may be distorted and the roundness of the bearing may be reduced. Absent.

3 and 4 show a sealing plate 1 according to a second embodiment of the present invention, in which the sealing plate 1 has a uniform thickness except for the outer peripheral edge portion. This seal plate is also the first
It is possible to obtain substantially the same operational effects as the seal plate 1 of the embodiment.

FIG. 5 shows a sealing plate 1 according to a third embodiment of the present invention, in which the ridge 1d is inclined slightly inward with respect to the axis of the sealing plate 1 except for the outer peripheral edge. Is formed to have a uniform thickness. This seal plate 1 is also the first
It is possible to obtain substantially the same operational effects as the seal plate 1 of the embodiment.

7 and 8 show a seal plate 1 according to a fourth embodiment and a fifth embodiment of the present invention, in which the seal plate 1 is a raised portion.
The inner peripheral surface of 1d is parallel to the axis of the seal plate 1, and the outer peripheral surface of the raised portion 1d is slightly inwardly inclined with respect to the axis of the seal plate 1 so that the thickness other than the outer peripheral edge is It is formed uniformly. This seal plate 1 can also achieve substantially the same operational effects as the seal plate 1 of the first embodiment.

In the third, fourth and fifth embodiments described above, the thickness of the seal plate 1 other than the outer peripheral edge portion is made uniform, but the inner peripheral edge portion is made thicker as in the first embodiment. You may form.

In each of the above embodiments, the inner peripheral surface of the seal plate 1 is finished in a linear shape, but the cross-sectional shape of the inner peripheral edge portion can be appropriately changed in design.

(Effects of the Invention) As described above, the seal plate of the present invention is formed with a ring-shaped protrusion having a substantially trapezoidal cross-section on the inner surface of the sealing plate, which is in surface contact with the inner surface of the locking groove. Since the raised portion that protrudes toward the outer side surface of the seal plate and contacts the outer side surface of the locking groove is formed on the outer peripheral edge portion of the seal plate, the following effects can be obtained.

That is, since the raised portion of the seal plate projects toward the outer surface of the seal plate and is in contact with the outer surface of the locking groove, compressive stress is generated in the raised portion when the seal plate is fitted into the locking groove. Even
Almost no force is generated to push the seal plate itself outward.

As a result, even if the sealing plate itself expands due to temperature change or absorption of moisture and a large compressive stress is generated in the ridge, the sealing plate does not bend greatly outward, and it is possible to maintain a good posture in the locking groove. Fitted and held, there is no protrusion on the side surface of the bearing.

Further, when the seal plate is fitted into the locking groove, the pushing amount is regulated by the substantially trapezoidal protrusion, so that even if the pressing force applied to the temporary seal plate becomes excessive, the seal plate is partially Without being crushed, damage and distortion of the sealing plate can be prevented. As a result, the seal plate does not rattle during use.

Further, since the protrusion of the seal plate makes surface contact with the inner surface of the locking groove and the outer peripheral edge portion is pressed into the locking groove by the elastic force of the raised portion of the sealing plate, the sealing property is significantly improved. It will be different. However, since the ridge is provided so as to project toward the outer surface of the seal plate, when the seal plate is fitted into the locking groove, the ridge always bends in the same direction, impairing the sealing performance. It will not be

[Brief description of drawings]

1 is a partially cutaway enlarged front view of a sealing plate according to a first embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of a bearing having the sealing plate according to the first embodiment, and FIG. 2 is a partially broken enlarged front view of the seal plate according to the second embodiment, FIG. 4 is a partially enlarged cross-sectional view of a bearing equipped with the seal plate according to the second embodiment, and FIG. 5 is a seal plate according to the third embodiment. Partially broken enlarged front view, FIG. 6 is a partially broken enlarged front view of the sealing plate according to the fourth embodiment, and FIG. 7 is a partially broken enlarged front view of the sealing plate according to the fifth embodiment, FIG. Is a partially cutaway enlarged front view of a conventional seal plate, and FIG. 9 is a partially enlarged sectional view of a bearing in which a conventional seal plate is mounted. Reference numeral 1 is a seal plate, 1c is a protrusion, 1d is a raised portion, 2 is an outer ring, 6 is a locking groove, 6a is an inner side surface, 6b is a bottom surface, and 6c is an outer surface.

Claims (1)

[Scope of utility model registration request] 1. A cross-sectional shape comprising a vertical inner side surface (6a) formed at both ends of an inner peripheral surface of an outer ring (2), a bottom surface (6b), and an outer side surface (6c) inclined outwardly is substantially U. The outer peripheral edge portion is fitted into the ring-shaped locking groove (6) so that the locking groove (6)
In a seal plate for a plastic bearing, which is elastically fitted to the inner and outer surfaces (6a) and (6c) of the above, a cross-sectional shape is formed on the inner side surface of the outer peripheral edge of the seal plate (1). A substantially trapezoidal projection (1c) is formed in an annular shape, and the projection (1c) is formed.
The flat top surface of c) is brought into surface contact with the inner surface (6a) of the locking groove (6), and the inclined surface on the outer peripheral side is used as the insertion inclined surface (1a). The outer inclined surface (1b) facing the outer surface (6c) of the locking groove (6) in parallel with the outer surface of the outer peripheral edge portion of 1) in order from the outer peripheral side to the inner peripheral side.
And a thin annular ridge (1d) having a substantially triangular cross-section that makes contact with the outer surface (6c) of the locking groove (6) in a bent state, and an annular ridge that facilitates elastic bending of the ridge (1d). A seal plate for a bearing made of plastic, characterized in that each recess (1e) is formed.