JP2001295849A - Seal plate for synthetic resin bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rotating sound from being generated by cutting a residual of a gate opening mark left on the outer circumferential side of a seal plate and sticking chips to a ball etc., when the seal plate is press-fitted in a lock groove in an outer ring, in the seal plate for synthetic resin bearing. SOLUTION: The seal plate 1 is formed with an approximately trapezoidal cross-section projection 1c into an annular shape in the inside face of the outer circumferential edge, the flat top face of the projection is made to abut on the inside face of the lock groove in its planar contact therewith, and the inclined face on its outer circumferential side is set to insertion inclined face. The seal plate is also formed with an annular protrusion 1d elastically touching the outside face of the lock groove and an annular recess 1e facilitating the elastic bending of the protrusion in the outside face of its outer circumferential edge. The insertion inclined face 1a is formed with a shallow groove having a lateral width W in the thickness direction of the seal plate so that the gate opening mark is positioned in the inside upper part of the shallow groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a plastic sealing plate used for a seal type bearing, and is used for a bearing having annular locking grooves formed on inner peripheral surfaces at both ends of an outer ring. In particular, when the seal plate is inserted into the locking groove of the outer ring, the residual resin at the gate opening trace remaining on the inclined surface on the outer peripheral side of the seal plate is shaved by the corner of the locking groove, and the shaved resin powder The present invention relates to a synthetic resin bearing seal plate capable of almost completely preventing rotation noise and the like due to the above.

[0002]

2. Description of the Related Art Generally, in the fields of office equipment and home electric appliances, a large number of sealed bearings in which grease (lubricant) is sealed are used. The plastic sealing plate is widely used because it is easy to insert and obtain good sealing performance.

[0003] As the plastic sealing plate, for example, a structure disclosed in Japanese Utility Model Publication No. 7-32895 has been widely known, and as shown in FIG. Is a substantially trapezoidal annular projection 1c
An annular raised portion 1d having a triangular cross-sectional shape projecting outward from the seal plate 1 on the outer surface of the outer peripheral edge portion;
An annular concave portion 1e for facilitating elastic bending of d is integrally formed.

The inner surface of the seal plate 1 is applied to the inner peripheral edge of the side surface of the outer race 2 of the bearing, and the outer peripheral edge of the seal plate 1 is uniformly pressed inward, so that the inner surface of the outer race 2 is formed. The cross-sectional shape formed on the peripheral surface is inserted into the substantially U-shaped locking groove 6, and the back side of the trapezoidal projection 1 c is brought into contact with the inner side surface 6 a of the locking groove 6 as shown in FIG. At the same time, the raised portion 1d comes into contact with the outer surface 6c of the locking groove 6 in a bent state.

As a result, the seal plate 1 is tightly and firmly inserted into the locking groove 2 by the elastic force of the raised portion 1d, and reliably seals the gap between the outer ring 2 and the inner ring 3. That is, the outer peripheral edge of the seal plate 1 is
a and a small gap G between the inner peripheral edge of the seal plate 1 and the inner ring 3 so that the grease sealed between the inner and outer rings 2 and 3 can be moved to the outside. Leakage and intrusion of dust and the like between the inner and outer rings 2 and 3 are prevented. In FIG. 14, reference numeral 4 denotes a ball, and reference numeral 5 denotes a retainer.

As shown in FIG. 15, these plastic sealing plates 1 are usually formed by connecting a movable mold for injection molding (not shown) and a fixed mold (not shown) to a line PL. Are formed as a so-called mold parting line in a facing manner, and the resin is injected from a gate port 7 provided on the outer peripheral side of the seal plate 1 to form the seal plate 1.

In forming the gate port 7,
A gate recess 8 having a predetermined depth is provided on the outer peripheral side of the seal plate 1 if necessary, and a gate port 7 is provided in the gate recess 8.
By providing a so-called submarine gate, when the resin portion of the gate mark 9 is cut off after the injection molding, the tip of the gate mark 9 is fixed to the outer peripheral surface of the seal plate 1 (insertion slope) as shown in FIG. It does not protrude outward from the surface 1a).

The gate port 7 is usually provided on the outer peripheral surface side of the seal plate 1 as shown in FIG. 15, since the thickness of the seal plate 1 is extremely small, when the gate port 7 is provided on the outer surface thereof. In this case, it is difficult to form the gate recess 8, and the direction of movement of the mold at the time of release of the molding die is the same as the direction of the remaining gate mark 9. This is because it is difficult to perform the sealing. In the injection molding of the seal plate 1 of this type, a molding method in which a gate port 7 is provided on the outer peripheral surface side of the seal plate 1 is adopted almost entirely.

However, even in the case of the submarine type gate opening configuration as shown in FIG. 16, if the upper surface 8a of a certain depth is present in the gate recess 8, the fixing force of the gate opening trace 9 by the upper surface 8a is large. Becomes As a result, when the gate mark 9 is cut off, the gate mark 9 in the recess upper surface 8a is not smoothly separated, and as shown in FIG. 17, the remaining part of the gate mark 9 moves outward from the insertion inclined surface 1a. It will protrude.

When the remaining portion of the gate mark 9 protrudes outward from the insertion inclined surface 1a on the outer peripheral surface of the seal plate, the seal plate 1 is pressed against the side surface of the outer ring 2 and pushed into the locking groove 6. At this time, the remaining portion of the projected gate opening mark 9 is shaved by the corner of the locking groove 6, and the shaved resin powder adheres to the ball 4, the ball raceway groove of the outer ring 2 and the inner ring 3. As a result, various troubles occur such as generation of rotational noise during operation of the bearing and irregular wear of the ball 4.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional synthetic resin bearing seal plate,
That is, the remaining portion of the gate mark 9 formed at the time of injection molding protrudes outward from the insertion inclined surface 1a of the outer peripheral surface of the seal plate, so that the remaining portion of the projected gate mark 9 is shaved when the seal plate 1 is inserted. In order to solve problems such as generation of rotation noise due to the resin powder, a large amount of the remaining gate mark 9 is not left, and a small amount of the gate mark 9 is left. As the sealing plate 1
A seal plate made of a synthetic resin bearing for preventing the remaining portion of the gate mark 9 from being scraped off at the time of insertion, thereby completely preventing the generation of rotational noise and the like caused by shavings of the remaining portion of the gate mark 9. Is provided.

[0012]

According to the first aspect of the present invention, there is provided a cross-sectional shape comprising a vertical inner side surface 6a, a bottom surface 6b formed at both ends of an inner peripheral surface of an outer ring 2, and an outer side surface 6c inclined outwardly. Are fitted into the substantially U-shaped annular locking groove 6 to elastically abut the inner and outer surfaces 6a and 6c of the locking groove 6, and the outer peripheral surface of the outer peripheral edge is provided. In the seal plate made of a synthetic resin bearing in which the gate mark 9 at the time of injection molding is located, a protrusion 1c having a substantially trapezoidal cross section is formed in an annular shape on the inner side surface of the outer peripheral edge of the seal plate 1, The flat top surface of the projection 1c is brought into contact with the inner side surface 6a of the locking groove 6 in a surface contact state, and the inclined surface on the outer peripheral side is inserted into the insertion inclined surface 1a.
An annular raised portion 1 d elastically contacting the outer surface 6 c of the locking groove 6 on the outer surface of the outer peripheral edge of the seal plate 1;
An annular concave portion 1e is formed to facilitate elastic bending of the raised portion 1d. Further, a shallow groove 10 having a width W in the thickness direction of the sealing plate 1 is formed on the insertion inclined surface 1a.
The basic configuration of the present invention is that the gate mark 9 is located above the inside of the gate 0.

According to a second aspect of the present invention, in the first aspect of the present invention, the shape of the upper portion of the shallow groove 10 in a side view is substantially triangular, and the depth of the shallow groove 10 gradually increases downward. It is like that.

A third aspect of the present invention is an annular ring having a substantially U-shaped cross section comprising a vertical inner side surface 6a, a bottom surface 6b, and an outer side surface inclined 6c formed at both ends of the inner peripheral surface of the outer ring 2. The outer peripheral edge is fitted into the locking groove 6 of
And elastically abut against the inner and outer surfaces 6a and 6c of the
In the synthetic resin bearing seal plate in which the gate mark 9 at the time of injection molding is located on the outer peripheral surface of the outer peripheral edge, a projection 1c having a substantially trapezoidal cross section is formed on the inner surface of the outer peripheral edge of the seal plate 1. Is formed into an annular shape, and the flat top surface of the projection 1c is brought into contact with the inner side surface 6a of the locking groove 6 in a surface contact state, and the inclined surface on the outer peripheral side thereof is used as the insertion inclined surface 1a. The outer surface of the outer peripheral edge of the plate 1 has an outer surface 6 c of the locking groove 6.
An annular ridge 1d elastically contacting the ridge 1d and an annular recess 1e for facilitating elastic bending of the ridge 1d are formed respectively.
Protrusions 11 are formed in the thickness direction of the seal plate 1 at a slight interval L on the insertion inclined surface 1a.
The basic structure of the present invention is that the gate mark 9 is located above the area between the gate marks 11.

According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, the annular raised portion 1d is provided on the outer surface 6c of the locking groove 6 by the outer peripheral surface 1d of the upper portion thereof. 'Is a thin annular raised portion 1d having a substantially triangular cross section.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 12, the same parts and members as those in FIGS. 13 to 17 are denoted by the same reference numerals. FIG. 1 is an enlarged vertical sectional view showing a main part of a synthetic resin seal plate according to a first embodiment of the present invention. As in the case of the conventional seal plate 1 shown in FIGS. The inside of a substantially U-shaped annular locking groove 6 having a vertical inner side surface 6a formed at both ends of an inner peripheral surface, a flat bottom surface 6b, and an outer side surface 6c inclined to open outward. Inserted into.

The seal plate 1 is formed in an annular shape by integral molding of engineering plastic having excellent heat resistance and abrasion resistance and having an appropriate elastic force. A substantially trapezoidal projection 1c having a cross-sectional shape that comes into contact with the inner side surface 6a in a surface contact state is formed in an annular shape. The protrusion 1c has a flat top surface, and an outer peripheral surface is an insertion inclined surface 1a.

A seal plate 1 is provided on the outer peripheral edge of the seal plate 1.
A protrusion 1d is formed in an annular shape, protruding in the direction of the outer surface and contacting the outer surface 6c of the locking groove 6 in a bent state.
The raised portion 1 d is formed in a pointed shape, and is shaped along the axis of the seal plate 1.

Further, an annular concave portion 1e is formed near the inner peripheral surface of the raised portion 1d to facilitate bending of the raised portion 1d. The thickness of the seal plate 1 of this embodiment is set to about 0.35 mm and the outer diameter is set to about 9 mm, and the inner peripheral portion is formed to be thick. The inner diameter of the seal plate 1 is set so that a very small gap is formed between the inner peripheral surface of the inner ring 3 and the outer diameter of the seal plate 1 when the seal plate 1 is fitted into the locking groove 6. The fitting groove 6 is set so that a slight gap is formed between the fitting groove 6 and the bottom surface of the locking groove 6.

Referring to FIGS. 1 and 2, the insertion inclined surface 1a on the outer peripheral side of the seal plate 1 has a width W = about 115 mm.
A shallow groove 10 having a depth H of about 0.05 mm is formed.
The upper part inside the shallow groove 10 is the position of the gate port 7. Also, the bottom surface 10a of the upper part of the shallow groove 10 is
As shown in FIG. 1, the depth H is formed so as to be inclined so as to gradually increase downward, so that the remaining portion of the gate mark 9 does not remain in a state protruding outside the insertion inclined surface 1a. Like that.

That is, by forming the bottom surface 10a at the upper part of the shallow groove 10 as described above, the fixing and holding force of the gate mark 9 near the portion A to the remaining portion becomes relatively weak, and the gate mark 9 after injection molding is reduced. When the remaining portion is pulled and peeled, the remaining portion of the gate mark 9 is cut off and peeled almost completely from the base and very easily.

FIGS. 3 and 4 show another example of the first embodiment of the present invention, in which a raised portion 1d is formed at a position slightly inward of the insertion inclined surface 1a of the seal plate 1. FIG. is there. The structure of the seal plate 1 is the same as that shown in FIGS.
Since this is the same as the case described above, a detailed description thereof will be omitted here.

FIGS. 5 to 7 show a second embodiment of the present invention. Instead of the shallow groove 10 of the first embodiment, the outer peripheral surface (insertion inclined surface 1a) of the seal plate 1 is provided. The protrusions 11 are formed at intervals L in the thickness direction of the seal plate 1.

That is, as shown in the plan view of FIG. 8, two ridges 11 are formed in parallel at a predetermined position E on the outer peripheral edge of the seal plate 1 at a predetermined interval L. At the outer peripheral edge positions F and F 'which are deviated by about 120 ° from the point E, a ridge 11 serving as a guide at the time of insertion is formed.

The width S of the ridge 11 is about 0.5 mm.
The height H 'is selected to be about 0.5 mm, and the distance L between the two ridges 11 is set to about 1.5 mm. The height H 'is selected in accordance with the remaining amount of the gate mark 9 and is set so that the remaining amount of the gate mark 9 does not go outside beyond the ridge 11. As shown in FIG. 6, the gate opening 7 is set at an upper portion between the two ridges 11, 11, and the remaining portion of the gate opening trace 9 mainly remains inside the gate opening 7.

When the seal plate 1 of the second embodiment is inserted into the locking groove 6 of the outer ring 2, first, the insertion inclined surface 1 a of the seal plate 1 is first attached to the inner peripheral edge of the side surface of the outer ring 2 as before. And press the outer peripheral edge evenly inward. Then, the sealing plate 1 has three projections 11 formed on the outer peripheral surface at an interval of about 120 ° to come into contact with the corners of the locking groove 6 to serve as a guide and to bend smoothly due to its elasticity. After that, the outer peripheral edge is fitted into the locking groove 6 of the outer ring 2. That is, as shown in FIG. 9, the seal plate 1 has the bottom surface of the projection 1 c abutting on the inner side surface 6 a of the locking groove 6 in a surface contact state, and the raised portion 1 d on the outer side surface 6 c of the locking groove 6. It comes into contact in a bent state, and is tightly and firmly fitted into the locking groove 6 by the elastic force of the raised portion 1d. As is clear from FIG. 9, since there is a gap G between the bottom surface 6 b of the locking groove 6 and the outer peripheral surface of the seal plate 1, expansion and contraction of the seal plate 1 due to heating and cooling or the like is caused by the gap G. Will be absorbed.

In the seal plate 1 according to the second embodiment shown in FIG. 8, guides at the time of insertion at approximately 120 ° intervals at three locations (E, F, F ') on the outer peripheral surface. Ridge 1 that plays a role
1 is provided, but it goes without saying that it may be provided at four or more places at about 90 °. Further, in the second embodiment, the protruding ridge 11 is formed in a half-moon shape as shown in FIG. 5 when viewed from the side in a longitudinal section. However, as shown in FIGS.
Needless to say, it may be.

In the first and second embodiments, the raised portion 1d that contacts the outer surface 6c of the locking groove 6 is formed in a narrow triangular shape. May be a prismatic shape or a relatively thick raised portion 1d as shown in FIG.

[0029]

According to the first aspect of the present invention, an inclined surface for insertion is provided on the outer peripheral side of the outer peripheral edge of the seal plate, and a shallow groove having a width W in the thickness direction is provided on the inclined surface for insertion. The gate mark is located above the gate mark. As a result, when the gate mark is separated from the seal plate after injection molding, the remaining gate mark hardly protrudes outside the insertion inclined surface, and the protruding gate mark is cut when the seal plate is inserted. It is possible to effectively prevent the occurrence of noise troubles and the like due to being performed. In particular, in the case where the bottom of the gate is formed as a shallow groove and the bottom is gradually deepened downward, the trace of the gate opening is smoothly pulled from the root and peeled off, and the residual trace of the gate opening becomes almost zero.

According to the third aspect of the present invention, an insertion inclined surface is provided on the outer periphery of the outer peripheral edge of the seal plate, and a narrow ridge is provided on the insertion inclined surface in the thickness direction with an interval L therebetween. It is formed so that the gate opening mark is located above between the two ridges. As a result, the protrusion provided on the inclined surface for insertion serves as a guide so that the seal plate can be smoothly inserted into the locking groove, and by appropriately selecting the height of the protrusion, the gate opening mark can be obtained. Can be completely prevented from protruding outward from the ridge, and the occurrence of an obstacle due to resin shavings can be completely prevented. Further, the ridges can be easily formed by applying a very small amount of processing to the mold, and do not hinder the arrangement and management of the seal plate. The sealing plate made of synthetic resin according to the present invention has excellent practical utility as described above.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a seal plate for a bearing made of synthetic resin according to a first embodiment of the present invention.

FIG. 2 is a partial front view of FIG. 1;

FIG. 3 is a partially enlarged sectional view of another example of the seal plate for a synthetic resin bearing according to the first embodiment of the present invention.

FIG. 4 is a partial view taken along line II in FIG. 3;

FIG. 5 is a partially enlarged cross-sectional view of a seal plate for a synthetic resin bearing according to a second embodiment of the present invention.

FIG. 6 is a partial view of the front side of FIG. 5;

FIG. 7 is a cross-sectional view taken along a roll in FIG. 6;

FIG. 8 is a schematic plan view of a synthetic resin bearing seal plate according to a second embodiment.

FIG. 9 is a longitudinal sectional view of a main part showing a state in which a seal plate according to a second embodiment is inserted.

FIG. 10 is a longitudinal sectional view of a main part of a seal plate provided with a ridge of another shape.

FIG. 11 is a vertical sectional view of a main part of a seal plate provided with a ridge of still another shape.

FIG. 12 is a longitudinal sectional view of a main part of a seal plate provided with a raised portion having another shape.

FIG. 13 is a longitudinal sectional view showing an example of a conventional synthetic resin sealing plate.

FIG. 14 is a longitudinal sectional view of a main part showing a state where the seal plate of FIG. 13 is inserted.

FIG. 15 is an essential part longitudinal cross sectional view showing a conventional state of forming a gate opening and a gate recess.

FIG. 16 is an explanatory diagram showing a state of forming gate marks on a conventional seal plate.

FIG. 17 is another explanatory view showing a state where a gate mark is formed on a conventional seal plate.

[Explanation of symbols]

1 is a bearing seal plate, 1a is an insertion inclined surface, 1c
Is a trapezoidal projection, 1d is a raised portion, 1d 'is an outer peripheral surface of the raised portion, 1e is a concave portion, 2 is an outer ring, 3 is an inner ring, 4 is a ball, 5
Is a retainer, 6 is a locking groove, 6a is an inner surface, 6b is a bottom surface,
6c is an outer surface, 7 is a gate opening, 8 is a gate recess, 8a is an upper surface, 9 is a mark of a gate opening, 10 is a shallow groove, 10a is a bottom surface of the shallow groove, 11 is a ridge, W is a lateral width, and H is a depth. , H 'is the height of the ridge, L is the interval, and S is the width of the ridge.

Claims (4)

[Claims] 1. A cross section comprising a vertical inner surface (6a), a bottom surface (6b), and an outer surface (6c) inclined outward and open at both ends of an inner peripheral surface of an outer ring (2) is substantially U-shaped. The outer peripheral edge of the groove is fitted into the L-shaped annular locking groove (6) to elastically abut the inner and outer surfaces (6a) and (6c) of the locking groove (6), and In the seal plate for bearing made of synthetic resin in which the gate opening mark (9) at the time of injection molding is located on the outer peripheral surface of the peripheral portion, a substantially trapezoidal cross section is formed on the inner side surface of the outer peripheral edge of the seal plate (1). The projection (1c) is formed in an annular shape, and the flat top surface of the projection (1c) is brought into contact with the inner side surface (6a) of the locking groove (6) in a surface contact state, and the outer peripheral side is inclined. Is used as an insertion inclined surface (1a), and the outer surface of the outer peripheral edge of the sealing plate (1) is brought into elastic contact with the outer surface (6c) of the locking groove (6). Annular ridge (1d) and annular recess (1e) for facilitating elastic bending of ridge (1d)
And a shallow groove (1) having a width (W) in the thickness direction of the sealing plate (1) on the insertion inclined surface (1a).
0), wherein the gate mark (9) is located above the inside of the shallow groove (10). 2. The shape of the upper part of the shallow groove (10) in a side view is substantially triangular, and the depth (H) of the shallow groove (10) gradually increases downward. 4. A seal plate for a synthetic resin bearing according to item 1. 3. A cross-sectional shape comprising a vertical inner surface (6a), a bottom surface (6b), and an outer surface (6c) inclined outwardly is formed at both ends of the inner peripheral surface of the outer ring (2). The outer peripheral edge of the groove is fitted into the L-shaped annular locking groove (6) to elastically abut the inner and outer surfaces (6a) and (6c) of the locking groove (6), and In the seal plate for bearing made of synthetic resin in which the gate opening mark (9) at the time of injection molding is located on the outer peripheral surface of the peripheral portion, a substantially trapezoidal cross section is formed on the inner side surface of the outer peripheral edge of the seal plate (1). The projection (1c) is formed in an annular shape, and the flat top surface of the projection (1c) is brought into contact with the inner side surface (6a) of the locking groove (6) in a surface contact state, and the outer peripheral side is inclined. Is used as an insertion inclined surface (1a), and the outer surface of the outer peripheral edge of the sealing plate (1) is brought into elastic contact with the outer surface (6c) of the locking groove (6). Annular ridge (1d) and annular recess (1e) for facilitating elastic bending of ridge (1d)
Are further formed, and narrow width ridges (11) are formed in the thickness direction of the sealing plate (1) at intervals (L) on the insertion inclined surface (1a). Article (11) ・ (1
A seal plate for a synthetic resin bearing, wherein the gate mark (9) is located above the space between 1). 4. An annular ridge (1d) is provided with a locking groove (6).
4. A thin annular protruding portion (1d) having a substantially triangular cross-section in which the outer peripheral surface (1d ') of the upper portion thereof contacts the outer surface (6c) of the upper surface in a bent state. 4. A seal plate for a synthetic resin bearing according to item 1.