JPH1182527A - Sealed type rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate power saving, by making a seal and an inner ring into non-contact state under the non-preload condition, and by contacting the seal with the inner ring under the preload condition. SOLUTION: An inner ring 1 is, on the periphery, provided with seal grooves 2, 3 which put the other ends of seals 7, 8 one ends 7c, 8c of which are fixed and arranged to grooves 4a, 4b of an outer ring 4, under the non-contact state. The seal 7, 8 are provided with clearances 9, 10 so that seal lips 7d, 8d are not contacted with groove bottoms 2a, 3a and groove walls 2b, 3b of the inner ring 1 under the condition of non-preload condition, and only after they are applied with a preload, one seal lip 7d is contacted with the groove wall 2b, and the other seal lip 8d is not contacted with the groove wall 3b. Thus, electric power consumption can be held low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing in which a seal and an inner ring are in contact when a preload is applied.

[0002]

2. Description of the Related Art Conventionally, a rolling bearing in which a seal and an inner ring are in contact with each other when a preload is applied, as described above, employs a generally known contact-type seal which is always in contact with the inner ring even in a state where no preload is applied. Used.

Accordingly, in such a general contact-type seal, when a preload is applied, the contact surface between the seal and the inner ring comes into contact more strongly, and the torque during rotation may become extremely heavy.
Therefore, when the bearing is incorporated into a motor or the like, the power consumption of the motor may increase due to the heavy torque. In such a case, there is a case in which the use is inadequate for applications requiring power saving.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. It is an object of the present invention to provide a method in which the seal is not in contact with the inner ring when no preload is applied, and the preload is reduced. The purpose of the present invention is to provide a rolling bearing capable of satisfying the need for power saving by contacting the seal with the inner ring when the rolling is applied.

[0005]

In order to achieve the above object, the present invention provides a technical means in which the seal and the inner ring do not contact each other in a non-preload state, and the seal and the inner ring contact each other when a preload is applied. That is.

[0006]

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

In FIG. 1, 1 is an inner ring, 4 is an outer ring, 5 is a rolling element,
Reference numeral 6 denotes a retainer, and reference numerals 7 and 8 denote seals. Further, the outer ring 4, the rolling elements 5, and the retainer 6 are not limited to the illustrated examples, and other structures can be adopted within the scope of the present invention.

The inner race 1 has one end 7 in the grooves 4a and 4b of the outer race 4.
Seal grooves 2 and 3 are provided around the other ends (lip 7d and 8d sides) of the seals 7 and 8 in which the seals c and 8c are fixedly disposed, respectively.

The seal grooves 2 and 3 are formed, for example, on the side surface 1 of the inner race 1.
The groove bottoms 2a, 3a are formed horizontally from the sides a, 1b, respectively, and the groove walls 2b, 3b are formed from the groove bottoms 2a, 3a in an upwardly inclined shape, respectively. , 3
b is arranged in parallel with the sides of the seals 7, 8, and the groove bottoms 2a, 3a are made non-contact by, for example, making the diameters smaller than the lower ends 7d ', 8d' of the seal lips 7d, 8d, respectively. Further, in the present embodiment, the groove wall is not formed upright on the side surfaces 1a and 1b of the inner race 1.

The seal grooves 2 and 3 are formed with the groove bottoms 2a and 3
If a is formed so as to have a smaller diameter than the lower ends 7d ', 8d' of the seal lips 7d, 8d, the inner lip 1 is horizontally extended from the side surfaces 1a, 1b of the inner ring 1 as in the present embodiment. Instead of being formed, it may be inclined. Further, groove walls 2c, 3c are formed upright on the side surfaces 1a, 1b of the inner ring 1, so that the cross-sectional shape of the seal grooves 2, 3 is formed in a U-shaped or V-shaped concave shape. Thus, a structure may be employed in which either one of the seals 7 and 8 contacts one of the groove walls 2c and 3c (see FIG. 3). Also, the groove walls 2b, 3b, 2
The c and 3c may be, for example, groove walls that rise vertically from the groove bottoms 2a and 3a, instead of being inclined upward as in the present embodiment. It is also possible.

According to the embodiment shown in FIG. 1, for example, according to the embodiment shown in FIG. , 3 in a non-contact manner. In addition, the structure of the one ends 7c and 8c which are fixed sides is not limited to the present embodiment, and a generally known structure can be used.

The seals 7 and 8 are composed of seal members 7a and 8a made of rubber or synthetic resin, for example.
a, 8a, and a metal core 7 made of metal or the like provided integrally therewith.
b, 8b, and the seal lips 7d, 8d are configured to be inclined toward the groove walls 2b, 3b of the inner race 1.

As described above, in the embodiment shown in FIG. 1, the seal lips 7d and 8d are configured so as to be inclined toward the groove walls 2b and 3b of the inner ring 1, but the embodiment shown in FIG. It may be configured to be inclined toward the direction of the groove walls 2c, 3c as described above, and is not limited to these, and can be arbitrarily changed within the scope of the present invention. The seals 7 and 8 are made of metal cores 7b and 8
The structure without b may be used.

When the seals 7 and 8 are not preloaded (in a state where no preload is applied), both seal lips 7d and 8d
Are respectively groove bottoms 2a, 3a and groove walls 2b, 3b of the inner ring 1.
Are arranged with certain gaps 9 and 10 between them.

That is, when the seals 7 and 8 are not preloaded (in a state where no preload is applied), both seal lips 7d and 8d are not connected to the respective groove bottoms 2a and 3a and the groove walls 2b and 3b of the inner ring 1. The gaps 9 and 10 are required so that one seal lip 7d and the groove wall 2b come into contact with each other and the other seal lip 8d is not in contact with the groove wall 3b only when a preload is applied. .

The gaps 9 and 10 formed between the groove walls 2b and 3b have an interval at which one seal lip 7d (8d) and the groove wall 2b (3b) are in contact with each other for the first time when a preload is applied. The distance may be appropriately set within the scope of the present invention.

Therefore, in the non-preload state, as shown in FIG. 1, the respective seals 7, 8 are located in non-contact in the grooves 2, 3 of the inner race 1, and the arrow Fa (→ ←) shown in FIG. When a preload is applied in the direction, the one seal 7 becomes the groove wall 2 b of the inner ring 1.
But the other seal 8 is in contact with the groove wall 3.
The gap 10 between the first and second b is widened and remains in a non-contact state (see FIG. 2).

When a preload is applied in the direction opposite to the arrow (→ ←) shown in FIG. 2, the seal 8 opposite to the seal 7 in FIG. 2 comes into contact with the groove wall 3b, And FIG.
The seal 7 that has been in contact with the groove wall 2b is not in contact with the groove wall 2b.

In the case of the embodiment shown in FIG. 3, in the non-preload state, as shown in FIG. 3 (a), the respective seals 7, 8 are located in non-contact with the grooves 2, 3 of the inner ring 1, FIG.
When a preload is applied in the direction of arrow Fa (→ ←) indicated by (b), one of the seals 7 comes into contact with the groove wall 2c of the inner ring 1, while the other seal 8 is in contact with the groove wall 3c. Gap 10 is widened and remains in a non-contact state. Note that FIG.
When a preload is applied in the direction opposite to the arrow Fa (→ ←) in (b),
The seal 8 comes into contact with the groove wall 3c, and the seal 7 comes out of contact with the groove wall 2c.

Further, the above-described embodiment is merely an embodiment used for describing the rolling bearing of the present invention, and is not limited thereto, and may be changed within the scope of the present invention. That is, in the above embodiment, the description has been given of the case of using both seal bearings. However, for example, a single seal bearing is also included in the scope of the present invention. Furthermore, in the case of a double seal bearing,
It is also within the scope of the present invention that only the preload side has the structure of the present invention and the non-preload side seal is a metal or rubber seal.

[0021]

Embodiments of the present invention will be described below with reference to FIGS. In this embodiment, the motors shown in FIG.
The rolling bearings (both seal types) shown in FIG. 1 are used for the bearings a and b, respectively, whereby the following operational effects are obtained.

When a preload is applied to the upper side of the outer ring 4 of the bearing a by the preload spring 12, the outer ring 4 of the bearing a → the inner ring 1 of the bearing a →
Preload is applied to the shaft 13 → the inner ring 1 of the bearing b → the outer ring 4 of the bearing b → the housing 11. As a result, the seals 7 and 8 come into contact or non-contact as follows. The upper seal 7 of the bearing a contacts the inner ring 1, and the lower seal 8 does not contact the inner ring 1. The upper seal 7 of the bearing b does not contact the inner ring 1,
The lower seal 8 contacts the inner ring 1.

Accordingly, since the lower seal 8 of the bearing b comes into contact with the inner ring 1, dust intrusion from the outside can be prevented. Further, since the lower seal 8 of the bearing a and the upper seal 7 of the bearing b do not contact the inner ring 1, respectively, the torque is reduced, and the power consumption of the motor is reduced.

This embodiment is merely an example of the bearing of the present invention, and the bearing of the present invention is arbitrarily selected and used in an apparatus requiring power saving. It is not limited to use in the illustrated examples.

[0025]

The rolling bearing of the present invention has a structure in which only one seal contacts the inner ring for the first time by applying a preload by applying a preload to the seal in a non-preload state. It has a sealing effect.

Therefore, when the rolling bearing of the present invention is incorporated in a motor or the like, the power consumption can be reduced as compared with the case where a conventional rolling bearing having a contact-type seal is incorporated. Rolling bearings can be provided that meet the needs of consumers.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a sealed rolling bearing of the present invention, in which a seal non-contact state is shown.

FIG. 2 is a longitudinal sectional view showing one embodiment of the sealed rolling bearing of the present invention, and shows a sealing contact state.

3A and 3B show another embodiment of the sealed rolling bearing of the present invention, wherein FIG. 3A shows a seal non-contact state, and FIG. 3B shows a seal contact state.

FIG. 4 is a partially cutaway view showing an embodiment of the sealed rolling bearing of the present invention.

FIG. 5 is a schematic view showing an embodiment of the sealed rolling bearing of the present invention.

[Explanation of symbols]

 1: inner ring 2, 3: inner ring seal groove 2a, 3a: groove bottom 2b, 2c, 3b, 3c: groove wall 7, 8: seal 7d, 8d: seal lip 9, 10: gap

Claims (1)

[Claims] 1. A sealed rolling bearing wherein the seal and the inner ring are not in contact with each other in a non-preloaded state, and the seal and the inner ring are in contact with each other when a preload is applied.