JP2001050288A - Sealed rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve a sealing property without increasing bearing width and cope with high speed rotation by providing a cover with a fixing part fixed to either one of an inner ring or an outer ring and providing a labyrinth, a contact seal or both of them between the cover and a sealing plate. SOLUTION: An external shape 13 of a sealing plate 11 is fitted into an outer ring 5 and a lip 14 on an inside diameter 12 side comes into contact with a seal groove 3 of an inner ring 1. At the outside of the sealing plate 11, a desired labyrinth 30 is formed in space with an outside face 16 of the sealing plate 11 and a steel plate or a plastic cover 21 is fixed to the inner ring 1. Therefore, even if water and mud are scattered from the outside, the almost all are interrupted by the cover 21 and entering of water and mud can be prevented by the labyrinth 30 and a labyrinth 31 between the outer ring 5 and the cover 21 and thereby entering of water and mud into the bearing becomes very difficult. By utilizing both surfaces of an inner ring seal groove outside diameter surface 2 and an inner ring end face 4, the cover 21 can be easily and accurately fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for an electromagnetic clutch for transmitting and shutting off power to a compressor of a refrigeration cycle of a vehicle such as an automobile, and an intermediate pulley for keeping the belt tension uniform. The present invention relates to a sealed rolling bearing.

[0002]

2. Description of the Related Art In conventional sealed rolling bearings used for conventional electromagnetic clutches, intermediate pulleys, etc., a total of two contact seals (sealing plates) are provided, one on each side, for sealing. I have. Although the shape of the sealing lip portion of these sealing plates is various, it is basically one piece on one side. For example, as shown in FIG. 11, the seal 300 is fitted to the outer ring 100, and the seal lip 301 is in contact with the inner ring 200, thereby preventing water or mud from entering from the outside.

[0003]

A conventional rolling contact bearing used for an electromagnetic clutch, an intermediate pulley, and the like includes:
Various light contact seals are adopted to cope with a rotational speed exceeding 000 rpm and to secure sealing performance.

[0004] In recent automobiles, the mounting position of a compressor or the like is located below the engine in order to reduce the space in the engine room, or the use of RV vehicles or the like has increased the bearing seal. The demand for hermeticity tends to increase year by year.

[0005] For this reason, there is a limit to the water resistance and dust resistance of the conventional light contact seal alone. Therefore, there has been a demand for a highly hermetically sealed bearing that minimizes the bearing width and minimizes the increase in cost.

However, in order to achieve high sealing in this type of conventional bearing, it is necessary to increase the lip interference. However, this increases self-heating during high-speed rotation, and as a result, the grease life of the bearing is reduced. It will cause a decline and is not realistic.

[0007] In addition, although bearings with slingers have been proposed for other uses, their fixing methods are not sufficient and the positioning accuracy is poor, making them suitable for applications such as electromagnetic clutches and bearings for intermediate pulleys. Absent. That is, Japanese Patent Application Hei 10-
037558 proposes a bearing with a slinger to improve the sealing performance, but the slinger and the bearing are not integrated,
Inconvenient in handling. Also, JP-A-11-10125
In No. 1, there is proposed a type in which a slinger having an L-shaped cross section is press-fitted from both sides into the inner surface of the inner ring. It is. Further, Japanese Unexamined Patent Publication No.
196066 proposes a bearing with a slinger to improve the sealing performance. This slinger is fixed to the inner ring side by both the flange portion and the protrusion, but the protrusion is very short and the cover is sufficient. Positioning accuracy cannot be obtained.

[0008] The present invention has been made in view of such problems of the prior art.
Significantly improved sealing without increasing the bearing width,
Another object of the present invention is to provide a sealed rolling bearing that can cope with high-speed rotation.

[0009]

The technical solution of the present invention to achieve the above object is a rolling bearing having a sealing plate between an inner ring and an outer ring, wherein the rolling bearing is provided inside the bearing and A cover is arranged outside the sealing plate to ensure high sealing performance, the cover includes a fixing portion for fixing to either the inner ring or the outer ring, and a labyrinth or contact seal is provided between the cover and the sealing plate. Or have both.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The bearing of the present invention includes a sealing plate 11 between the inner ring 1 and the outer ring 5, and is provided inside the bearing and the sealing plate 11.
A cover 21 is arranged outside the housing to ensure high sealing performance, and a long labyrinth 3 is provided between the sealing plate 11 and the cover 21.
0 or a contact seal or both. In the drawings, reference numeral 9 denotes a rolling element, and reference numeral 10 denotes a cage.

The inner ring 1, the outer ring 5, the rolling elements 9, and the retainer 10 are not particularly limited in the present invention.
Although a detailed description is omitted, a well-known structure or the like can be appropriately changed within the scope of the present invention.

The sealing plate 11 is fixed to one of the bearings (the inner ring 1 or the outer ring 5) on the inner diameter 12 side or the outer diameter 13 side. The sealing plate 11 is made of rubber or synthetic resin, or a metal core coated with rubber or resin. It may be either a contact or non-contact seal of the annular body, or a shield made of metal or the like, and its shape and structure are not particularly limited and can be arbitrarily changed within the scope of the present invention. is there. Further, the presence or absence of the lip is not limited.

A second lip 15 is formed on the outer surface (front surface) 16 of the sealing plate 11, and when the sealing plate 11 is in light contact with the cover 21, the second lip 15 can also prevent intrusion of a part of water or mud. I can do it.

Further, in order to prevent heat generated by rotation of the sealing plate 11 and the cover 21 as much as possible, part or all of the second lip 15 may not be in contact with the cover 21. The provision of the second lip 15 improves dustproofness (high sealing property) for preventing intrusion of dust and sludge from the outside.

The cover 21 is formed of a steel plate or a synthetic resin into an annular body, and is provided with a fixing portion 24 at one of an inner diameter 22 and an outer diameter 23 thereof.
Alternatively, it is arranged inside the outer ring 5) and outside the sealing plate 11 to ensure high sealing performance.

The cover 21 may be made of, for example, a corrosion-resistant plating such as a galvanized steel plate or stainless steel, or a synthetic resin such as nylon or PPS mixed with glass fiber. Is appropriately selected within the range.

The fixing portion 24 is provided with an inner diameter 22 of the cover 21.
Alternatively, an axial fitting piece 25 formed on one of the outer diameters 23 and fitted on one of the bearings (the inner ring outer diameter surface 2 or the outer ring inner diameter surface 6), and each axial direction formed in this manner. The fitting pieces 25 are formed straight on the same diameter side and are formed of radial guide pieces 26 that come into contact with either one of the bearings (the inner ring 1 or the outer ring 5) end face 4 or 8.

Specifically, the following configuration is given as a typical example of the fixing portion 24. For example, the inner diameter 2 of the cover 21
2 are bent in the axial direction at several places, and are radially interposed between the axial fitting pieces 25... Fitted on the inner ring outer diameter surface 2 and the axial fitting pieces 25. The radial guide pieces 26 which are formed straight and come into contact with the inner ring end face 4 are provided.
(See FIG. 2).

The axial fitting piece 25 is provided on one of the inner surfaces 2 of the cover 21 near the inner diameter 22 or the outer diameter 23.
7, a plurality of protrusions are integrally or separately protruded in the axial direction in the circumferential direction, or are protruded in the axial direction continuously in the circumferential direction. A structure in which any one of the outer diameters 23 becomes the radial guide piece 26 as it is may be used.

The fixing portion 24 is merely an example, and the present invention is not limited thereto. The axial fitting piece 25 and the radial guide piece 26 constituting the fixing portion 24 are merely examples. The overall length and shape are not particularly limited, and the number of formed covers is not limited. A plurality of covers 21 can be easily and accurately fixed to the bearing. It is sufficient if they are formed one by one, and they can be set arbitrarily.

Therefore, even if water, mud or the like is scattered from the outside by the cover 21, most of the scattered water or mud can be shut off at this portion, and the intrusion of water, mud or the like into the bearing becomes very small.

The fixing of the cover 21 to the bearing (the inner ring 1 or the outer ring 5) does not necessarily have to be completely fixed, and may be such that the cover 21 is not detached until it is incorporated into an electromagnetic clutch, an intermediate pulley or the like. This is because, after being assembled, the cover 21 and the bearing (the inner ring 1 or the outer ring 5) are fixed so that they cannot move in the axial direction.

Further, a long labyrinth 30 is formed by the cover 21 and the sealing plate 11, so that intrusion of water, mud or the like into the bearing can be further suppressed. The shape and length of the labyrinth 30 are not particularly limited.
1, can be appropriately changed depending on the structure of the cover 21.

The sealing plate 11 and the cover 21 are disposed inside at least one of the left and right bearings so that the labyrinth 3
0 or a contact seal or both may be formed.

Next, a specific embodiment of the present invention will be described.

[First Embodiment] In this embodiment, the outer ring 13 of the sealing plate (seal) 11 is fitted to the outer ring (fixed ring) 5, and the lip 14 of the inner diameter 12 is fitted into the seal groove 3 of the inner ring 1. In contact. A desired labyrinth 30 is formed between the outer surface 16 of the sealing plate 11 and the outer surface 16 of the sealing plate 11, and a steel plate or plastic cover 21 is fixed to the inner ring 1 (FIGS. 1 and 2). ).

In this embodiment, the cover 21 is fixed by bending an arbitrary portion of the inner diameter 22 at predetermined intervals (4 to 8 positions) inward in the axial direction so as to form a strip, and forming the outer ring seal groove. The axial fitting piece 25 for fitting the outer surface 25a to the radial surface 2 and the thus formed axial fitting pieces 25... Guide piece 26 that contacts its inner surface 26a
...

At this time, the sealing plate 11 is a seal formed by covering the core metal 17 with rubber. The sealing plate 11 is of a non-contact type with respect to the cover 21, and is provided between the inner surface 27 of the cover and the outer surface 16 of the sealing plate. A long labyrinth 30 is formed.

The labyrinth 30 is arbitrarily formed by adjusting the outer surface 16 of the sealing plate 11 and the inner surface 27 of the cover 21.
The width, shape and the like are not particularly limited, and are optional within the scope of the present invention.

For example, the outer shape of the sealing plate 11 and the cover 2
If the labyrinth shape is complicated by making one or both of the inner surface shapes complicated, it becomes more difficult for water or mud to enter.

Therefore, even if water, mud or the like is scattered from outside, most of the scattered water is blocked by the cover 21, and the labyrinth 31 between the labyrinth 30, the outer ring 5 and the cover 21 is further removed.
Infiltration of water, mud and the like into the bearing becomes very difficult because it can prevent intrusion. In addition, as described above, by using both surfaces of the inner ring seal groove outer diameter surface 2 and the inner ring end surface 4, the cover 21 is formed.
Can be easily and accurately fixed.

In this embodiment, a relief 33 is formed at an angle on the inner diameter surface 6 of the outer ring 5 of the labyrinth 31 of the cover 21 and the outer ring (fixed ring) 5.

In general, a bearing used for an electromagnetic clutch or an intermediate pulley is provided with a clearance 33 at an appropriate angle on the inner diameter surface 6 of the outer ring 5 in a labyrinth 31 formed by the outer ring 5 and the cover 21 during operation. Even if water, mud or the like is scattered, the part is rotating and is discharged to the outside of the bearing along the relief (angle) 33 due to the centrifugal force. It will be difficult.

[Second Embodiment] In this embodiment, the sealing plate 11
A second lip 15 is provided on the outer surface 16 of the ridge.
The second lip 15 is in light contact with the outer diameter 23 of the cover 21 (FIG. 3).

The inclination angle of the second lip 15 is not limited. The other configuration and operation and effect are the same as those of the first embodiment, and therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted.

Therefore, by providing the second lip 15, it is possible to prevent a part of water or mud from entering and to improve the high sealing performance. In addition, because of the contact in the radial direction, there is an advantage that the contact pressure can be easily controlled.

[Third Embodiment] In this embodiment, the sealing plate 11
In order to minimize heat generation due to rotation of the cover and the cover 21, a part or the entirety of the second lip 15 in the third embodiment is made non-contact (FIG. 4). Even with such a configuration, the labyrinth 3 between the second lip 15 and the cover 21
According to 2, it is possible to prevent intrusion of water, mud and the like as in the second embodiment.

Since the other constructions and functions and effects are the same as those of the second embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.

[Fourth Embodiment] In this embodiment, a modification of the fixing portion 24 of the cover 21 in the third embodiment is shown (FIG. 5).

That is, in the present embodiment, as in the first to third embodiments, an arbitrary portion of the inner diameter 22 is bent at predetermined intervals (several to four positions) inward in the axial direction so as to be bent in the axial direction. Instead of forming the fitting pieces 25 in a strip shape and forming the radial guide pieces 26 straight in the radial direction between the axial fitting pieces 25 thus formed, The inner diameter 22 is used as it is as the radial guide piece 26, and the axial fitting piece 25 is continuously or intermittently concentric with the inner diameter 22 at the inner surface position within a desired distance from the inner diameter 22. It has a structure with several protrusions (FIG. 5).

Since the other constructions and functions and effects are the same as those of the third embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.

Fifth Embodiment In this embodiment, the cover 21
The outer diameter is inclined outward at an angle to the inclined inner surface 28,
Along with inwardly bending the inner diameter, the axial fitting piece 25 is bent outward from the bending portion 29 in the axial direction,
The fitting piece 25 is bent from the end in the radial direction to form a radial guide piece 26 continuously. A second lip 15 is continuously provided on the outer surface 16 of the sealing plate 11 so as to make light contact with the inclined inner surface 28 near the outer diameter of the cover 21 (FIG. 6).

With such a configuration, the light lip of the second lip 15 to the cover 21 can prevent intrusion of water, mud, and the like as in the second embodiment.

Further, in this embodiment, the axial fitting piece 25 and the radial guide piece 26 are continuously provided, respectively. However, the slits are formed at predetermined intervals and are formed intermittently. It is also within the scope of the present invention.

Further, the angle of the inclined inner surface 28 of the cover 21, the angle of the bent portion 29, the bending angle of the radial guide piece 26, or the length and inclination angle of the second lip 15 of the sealing plate 11 are particularly limited. However, it can be freely changed within the scope of the present invention.

Since the other constructions and functions and effects are the same as those of the first embodiment and the like, the same portions are denoted by the same reference numerals and description thereof will be omitted.

Sixth Embodiment In this embodiment, the sealing plate 11
In order to minimize heat generation due to rotation of the cover and the cover 21, part or all of the second lip 15 in the fifth embodiment is made non-contact (FIG. 7).

With such a configuration, the second lip 15
The labyrinth 32 between the cover and the cover 21 can prevent intrusion of water, mud, and the like as in the fifth embodiment. The other configuration and operation and effect are the same as those of the fifth embodiment, and therefore, the same portions are denoted by the same reference characters and description thereof will be omitted.

"Seventh Embodiment" This embodiment shows a modification in which the cover 21 is made thicker in the fifth embodiment (FIG. 8). The other configuration and operation and effect are the same as those of the fifth embodiment, and therefore, the same portions are denoted by the same reference characters and description thereof will be omitted.

[Eighth Embodiment] This embodiment shows a modification of the labyrinth 30 in the fifth embodiment (FIG. 9). That is, in this embodiment, a plurality of ridges 18 are provided concentrically on the outer surface 16 of the sealing plate 11 to complicate the labyrinth 30 with the inner surface 27 of the cover.

In the present embodiment, the ridges 18 are formed on the inclined surface 1.
9 and an axial horizontal surface 20 are projected in a triangular cross section, and each of the ridges 18 has the same shape.
This makes it extremely difficult for water, mud, and the like to enter, and is extremely excellent.

The number, inclination angle, shape and the like of the ridges 18 are not particularly limited and can be arbitrarily changed within the scope of the present invention. It is also possible to make the shape, angle and the like different for each of the ridges 18.

The labyrinth 30, which is complicated by the provision of the ridges 18, is also within the scope of the present invention when applied to the above-described first to seventh embodiments.

"Ninth Embodiment" This embodiment shows a type having no second lip 15 in the eighth embodiment (FIG. 10). The other configuration and operation and effect are the same as those of the eighth embodiment, and therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted.

[Tenth Embodiment] In this embodiment, the axial fitting piece 25 is formed to be inclined, and the outer surface 25a is fitted to the inclined surface 2a provided on the outer diameter surface 2 of the inner ring 1. The structure is fixed (FIG. 11).

The structure of this embodiment can be applied to the above-described first to ninth embodiments, and other configurations and operational effects are the same as those of the above-described embodiments. The description is omitted.

"Eleventh Embodiment" In this embodiment, the axial fitting piece 25 has its outer surface 25a fitted to the outer diameter surface 2 and its slightly bent tip portion 25b attached to the inner race 1. (See FIG. 12).

The structure of this embodiment can be applied to the above-described first to ninth embodiments, and other configurations and operational effects are the same as those of the above-described embodiments. The description is omitted here.

[Twelfth Embodiment] In this embodiment, the axial fitting piece 25 is formed in an inclined shape, and the tip end 25b is fitted and fixed in the groove 2b formed in the outer diameter surface 2 of the inner ring 1. This is the structure (FIG. 13).

The structure of this embodiment can be applied to the above-described first to ninth embodiments, and other configurations and operational effects are the same as those of the above-described embodiments. The description is omitted here.

[Thirteenth Embodiment] In this embodiment, the outer diameter surface 2 of the inner ring 1 is bulged in the circumferential direction, and the bulged surface 2c
(See FIG. 14). The axial fitting piece 25 provided with the curved surface 25c corresponding to the outer surface 25a is fitted and fixed to the bulging surface 2c.

The structure of this embodiment can be applied to the above-described first to ninth embodiments, and the other structures and operational effects are the same as those of the above-described embodiments. The description is omitted here.

[Fourteenth Embodiment] In the present embodiment, the fixing portion is constituted only by the axial fitting piece 25, and the tip 25 d of the fitting piece 25 is attached to the outer diameter surface 2 of the inner race 1. Abuts against the wall surface 2e of the circumferential recess 2d provided on the outer surface 25.
This is a structure in which a is fitted and fixed to the bottom surface 2f (FIG. 15). By employing a structure in which the tip 25d of the fitting piece is brought into contact with the wall surface 2e, positioning accuracy of the cover 21 in the axial direction can be improved.

The structure of this embodiment can be applied to the above-described first to ninth embodiments, and other configurations and operational effects are the same as those of the above-described embodiments. The description is omitted here.

[Fifteenth Embodiment] In the fifteenth embodiment, the fixed portion is constituted only by the axial fitting piece 25, and the back surface 29a of the bent portion 29 is attached to the wall surface 2e of the recess 2d of the inner ring 1. This is a structure in which the outer surface 25a of the axial fitting piece 25 is fitted and fixed to the bottom surface 2f while being abutted (FIG. 1).
6). By employing a structure in which the back surface 29a of the bent portion is brought into contact with the bottom surface 2e, the positioning accuracy of the cover 21 in the axial direction can be improved.

The structure of this embodiment can be applied to the above-described first to ninth embodiments, and other configurations and operational effects are the same as those of the above-described embodiments. The description is omitted here.

[0068]

According to the present invention, it is possible to provide a sealed rolling bearing which can greatly improve the sealing performance without increasing the bearing width and can cope with high-speed rotation. In other words, by installing a cover inside the bearing on either one of the left and right sides and outside the sealing plate, it is possible to greatly prevent intrusion of water, mud, etc. from the outside, and at the same time, the cover can be installed in a minimum space. Can be held well. In addition, the cover is easily and reliably connected to one of the bearings by a fixing portion including an axial fitting piece that fits the outer diameter surface or the inner diameter surface of the bearing and a radial guide piece that is guided and contacted with the end surface of the bearing. In addition to being fixed, the positioning accuracy of the cover outer diameter portion in the axial direction can be improved.

In the highly sealed bearing according to the present invention, the cover
Outside of the sealing plate and arranged integrally with the bearing, and by forming one or both of the labyrinth and the contact seal on the sealing plate and the cover, even if water or mud splashes during vehicle running Most of the contact seal lip is blocked by the cover, and water and mud cannot reach the inner contact seal lip due to the labyrinth and the contact seal.

[Brief description of the drawings]

FIG. 1 is a partially enlarged longitudinal sectional view showing an embodiment of the bearing of the present invention.

FIG. 2 is an overall perspective view of the cover illustrated in FIG. 1 viewed from an inner surface direction.

FIG. 3 is a partially enlarged longitudinal sectional view showing a second embodiment.

FIG. 4 is a partially enlarged sectional view showing a third embodiment.

FIG. 5 is a partially enlarged sectional view showing a fourth embodiment.

FIG. 6 is a partially enlarged sectional view showing a fifth embodiment.

FIG. 7 is a partially enlarged sectional view showing a sixth embodiment.

FIG. 8 is a partially enlarged sectional view showing a seventh embodiment.

FIG. 9 is a partially enlarged sectional view showing an eighth embodiment.

FIG. 10 is a partially enlarged sectional view showing a ninth embodiment.

FIG. 11 is a partially enlarged sectional view showing a tenth embodiment.

FIG. 12 is a partially enlarged sectional view showing an eleventh embodiment.

FIG. 13 is a partially enlarged sectional view showing a twelfth embodiment.

FIG. 14 is a partially enlarged sectional view showing a thirteenth embodiment.

FIG. 15 is a partially enlarged sectional view showing a fourteenth embodiment.

FIG. 16 is a partially enlarged sectional view showing a fifteenth embodiment.

FIG. 17 is a partially enlarged sectional view showing a conventional technique.

[Explanation of symbols]

 1: inner ring 2: outer diameter surface 4: end surface 5: outer ring 6: inner diameter surface 8: end surface 11: sealing plate 21: cover 24: fixing portion 25: axial fitting piece 26: radial guide piece 30: labyrinth (sealing) 31: Labyrinth (between cover and inner ring inner diameter surface) 32: Labyrinth (between cover and second lip)

Claims (1)

[Claims] 1. A rolling bearing comprising a sealing plate between an inner ring and an outer ring, wherein a cover is arranged inside the bearing and outside the sealing plate to ensure high sealing performance. A sealed rolling bearing having a fixing portion for fixing to either the inner ring or the outer ring, and having a labyrinth and / or a contact seal between the cover and the sealing plate.