JP2539597Y2 - Rolling bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bearing used in, for example, an automobile transmission or a differential gear mechanism, and more particularly to a power transmission gear held in a gear case provided with a lubricating oil tank. The present invention relates to a rolling bearing such as a cylindrical roller bearing, a tapered roller bearing, and a ball bearing that are supported.

[0002]

2. Description of the Related Art In a transmission and a differential gear mechanism of an automobile, a drive shaft or a driven shaft to which a gear is fitted is supported through a bearing, and the power from the internal combustion engine is reduced and transmitted or the rotational drive direction is changed. ing. Such a power transmission mechanism is disposed in a gear case, in which lubricating oil for lubricating these gears or bearings is filled to form a lubricating oil storage tank. is there. For example, as shown in FIG. 7, a drive shaft 50 and a driven shaft 60 having gears 31, 32 and 33, 34 and the like fitted therein are arranged in a gear case 30, and these drive shafts and driven shafts are bearings 35. , 3
6, 37 and 38 are supported. A lubricating oil storage tank 39 is formed in the lower part of the gear case 30. A part of the gear 31 and the like splashes lubricating oil to lubricate the entire gear.

[0003] The lubricating oil in the gear case 30 often contains minute dust generated during gear meshing or machining or polishing. Bearings that must be used in dirty oil containing such hard foreign matter cause indentations on the rolling surface due to such foreign matter, cracks originating from the indentations lead to surface starting point separation, and the expected life of the bearing May not be completed. As a conventional lubrication method for bearings and the like, there has been an open type lubrication method for lubricating the bearings 35 and the like simultaneously with the gears. However, since it is impossible to prevent foreign matter from entering, a sealed bearing with a filter has been proposed. I was However, simply filtering fine dust with a filter causes clogging and eventually causes seizure, which limits the effect. Therefore, a structure in which the bearing itself is hermetically sealed and the inside of the bearing is separately lubricated with lubricating oil or grease having a higher viscosity than the gear lubricating oil has been proposed, and is known to be effective. (JP-A-53-109049). Japanese Patent Application Laid-Open No. 55-101 discloses a bearing having a structure in which foreign matter is prevented from entering as much as possible into a bearing for supporting a drive shaft disposed in the above-mentioned gear case.
No. 40 is known. In addition, a rubber seal or a felt seal may be attached to the bearing.

[0004]

When lubricating bearings 35, 36 and the like disposed in a gear case for storing lubricating oil, rubber seals or felt seals are used for lubricating oil. This makes it difficult to penetrate and causes the problem of seizure. In the case of a structure in which the inside of the bearing is lubricated with separate lubricating oil in consideration of the intrusion of foreign substances contained in the lubricating oil, the bearing structure becomes complicated, cost increases cannot be avoided, and maintenance and inspection are troublesome. . Further, the fine dust in the lubricating oil is difficult to remove because it is always jumped up and moved together with the lubricating oil by the gear. Even if the lubricating oil itself stored in the gear case is removed by a filter, the filter is easily clogged and maintenance and inspection are troublesome.

[0005] This invention has been made in view of the above-mentioned problems, and without complicating the structure of the bearing itself.
It is an object of the present invention to provide a rolling bearing that can be easily maintained and inspected, and that can use lubricating oil stored in a gear case for lubricating the bearing.

[0006]

In order to solve the above-mentioned problems, the present invention provides an outer race, an inner race, and a rolling element interposed between inner and outer races and held by a synthetic resin cage. In the rolling bearing having a tongue, a tongue-shaped section that slides on the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring is formed at both outer ends or one end of the cage, and the outer peripheral surface is formed on both sides or one side thereof. It is characterized in that magnets are integrally embedded in the mold at fixed intervals in the direction.

Alternatively, in a rolling bearing having an outer race, an inner race, and a rolling element interposed between the inner race and the outer race and held by a synthetic resin cage, both ends or one end on the outside of the cage. In addition, a labyrinth sealing portion is formed between the inner peripheral surface of the outer race or the outer peripheral surface of the inner race, and magnets are integrally embedded in the mold on both sides or one side of the outer end surface at a constant circumferential interval. It is characterized by the following.

[0008]

The operation of the rolling bearing according to the present invention in the case where the retainer is used as the above means will be described with reference to the accompanying drawings. According to the means, as shown in FIG. 1, the retainer 5 is a T-shaped retainer having tongue-shaped sections 5a, 5b formed at the ends, and the inner peripheral surface of the outer ring 1, the inner ring 2, Sliding contact with the outer peripheral surface of the ring 3 can prevent relatively large foreign matter from entering the raceway surface, and the outer end surface 5
A magnetic substance such as iron powder can be adhered by the magnet 6 embedded in e to prevent entry of minute foreign matter into the raceway surface.
5 and 6, it is possible to prevent foreign substances from entering the labyrinths 11 and 13 and to prevent fine dust and the like from entering the raceway surface by the magnet 6. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a part of an axial sectional view of a cylindrical roller bearing which is a first embodiment of the rolling bearing of the present invention, and FIG. 2 is a view taken in the direction of arrow P in FIG. In this embodiment, the cylindrical roller bearing has an outer ring 1 having flanges 1F and 1F formed at both ends, an inner ring 2 having a flange 2F formed at one end, a separate ring 3, a roller 4, It comprises a T-shaped holder 5 for holding the rollers 4. The ring 3 and the inner ring 2 may be connected by appropriate means (not shown). Tongue-shaped sections 5a, 5b are provided at both ends of the T-shaped retainer 5 so as to be in sliding contact with the inner peripheral surface of the outer ring 1 and the outer peripheral surfaces of the inner ring 2 and the ring 3.
5c and 5d are formed. The bearing of this embodiment is NU
Although it is a P-type cylindrical roller bearing, an N-type cylindrical roller bearing or an NU-type cylindrical roller bearing can of course be used.

Next, the outer end faces 5 on both sides of the cage 5
Magnets 6 are buried at regular intervals in e and 5f. However, the magnets 6 may be embedded at irregular predetermined intervals instead of at regular intervals. The surface in which the magnets 6 are embedded may be one side surface, not the both side surfaces of the cage 5, particularly only the surface on the side where the lubricating oil enters. The retainer 5 is formed of a synthetic resin, and the tongue-shaped sections 5a and 5b are integrally formed and the magnet 6 is integrally embedded by molding.

As described above, the retainer 5 is a T-shaped retainer, and tongues are provided so as to be circumferentially in contact with the inner peripheral surface 1a of the outer ring 1, the outer peripheral surface 2a of the inner ring 2 and the outer peripheral surface 3a of the ring 3 at both ends. By forming the shape-like pieces 5a, 5b, etc., it is possible to prevent relatively large foreign matter from entering the raceway surface, and the outer end surface 5e
The magnetic material such as iron powder can be attached by the magnet 6 embedded in the magnet to prevent entry of minute foreign matter into the raceway surface. The tongue-shaped section may be formed only on one of the upper and lower sides of the end face of the retainer 3, and a minute gap may be formed on the opposite side.

Next, FIG. 3 is an axial sectional view of a second embodiment of the rolling bearing of the present invention (having a different shape but a common reference numeral). That is, the retainer 5 forms tongue-shaped sections 5a and 5b, one of which is in contact with the inner peripheral surface of the outer ring and the inner peripheral surface of the inner ring, and a gap 7 between the outer peripheral surface of the other inner ring and the inner peripheral surface of the retainer.
And the magnets 6 may be embedded at regular intervals in the circumferential direction of the outer surfaces 5e and 5f of the retainer 5. Of course, the magnet 6 may be embedded only on one side (for example, on the 5e side).

FIG. 4 shows a third embodiment of the rolling bearing of the present invention, which is an embodiment applied to a tapered roller bearing. That is, the raceway surface 1 of the outer race 1 is
g, and a predetermined gap 7 (0 to 0) is formed between the outer peripheral surface of the inner ring 2 and the inner peripheral surface of the retainer 5 while forming a tongue-shaped section 5a that is in sliding contact with the inner ring 2.
0.05 mm), and a T-shaped retainer having a structure in which the magnets 6 are embedded at a constant interval in the circumferential direction on one side. Also in this case, it is possible to prevent entry of a relatively large foreign matter and to prevent the foreign matter from entering the raceway surface by adhering minute dust by the magnet 6.

In the rolling bearing of the present invention, the lubricating oil in the lubricating oil tank in the gear case is splashed up by a gear or the like to lubricate the bearing together with the gear and the like. This is to prevent intrusion. However, it is also possible to use other bearings in which foreign matter such as minute dust may enter the raceway surface.

FIG. 5 shows a fourth embodiment of the rolling bearing of the present invention, in which a labyrinth structure is provided between the outer ring and the retainer or between the inner ring and the retainer.
That is, labyrinths 11 and 13 are provided between the grooves provided on the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the retainer 5, or labyrinths 12 and 14 are provided between the outer peripheral surface of the inner ring 2 and the inner peripheral surface of the retainer 5. If the magnets 6 are buried at both ends 5e and 5f on both sides of the retainer 5 at a constant circumferential direction, the labyrinth 11 and the like can prevent the invasion of foreign substances and the magnet 6 tracks the fine dust and the like. Intrusion into the surface can be prevented.

FIG. 6 shows a fifth embodiment of the rolling bearing of the present invention, in which the outer peripheral surface of the inner ring 2 and the outer peripheral surface of the inner ring 2 and the outer peripheral surface of the inner ring 2 and the outer peripheral surface of the inner ring 2 are connected to each other. 5 is an embodiment in the case where a labyrinth structure is provided between the inner peripheral surface and the inner peripheral surface. Also in this embodiment, the labyrinth 11, if the magnets 6 are embedded in the outer end surfaces 5e, 5f of the retainer 5 at a constant interval in the circumferential direction,
13 and the like can prevent foreign matter from entering, and the magnet 6 can prevent fine dust and the like from entering the raceway surface. As described above, in each embodiment, the cage 5
Is molded with synthetic resin, and the magnet 6 is integrally embedded by molding, but in this case, the retainer is not limited to synthetic resin.

[0017]

As described above in detail, according to the rolling bearing of the present invention, not only can it be used in dirt oil containing hard foreign matter in the lubricating oil, but also such hard foreign matter can be prevented from entering. I can do it. Thus, the bearing can be lubricated simultaneously with the oil for lubricating the gears and the like, and the bearing life can be improved.

[Brief description of the drawings]

FIG. 1 is a part of an axial sectional view of a first embodiment of the rolling bearing of the present invention.

FIG. 2 is a view on arrow P of FIG. 1;

FIG. 3 is an axial sectional view of a second embodiment of the rolling bearing of the present invention.

FIG. 4 is an axial sectional view of a third embodiment of the rolling bearing of the present invention.

FIG. 5 is an axial sectional view of a fourth embodiment of the rolling bearing of the present invention.

FIG. 6 is an axial sectional view of a fifth embodiment of the rolling bearing of the present invention.

FIG. 7 is a schematic sectional view showing a power transmission mechanism in a gear case such as a transmission of an automobile.

[Explanation of symbols]

 Reference Signs List 1 outer ring 2 inner ring 3 ring 4 roller 5 retainer 5a, 5b, 5c, 5d tongue-shaped section of retainer 5e, 5f outer end face of retainer 6 magnet

Claims (2)

(57) [Scope of request for utility model registration] 1. A rolling bearing having an outer race, an inner race, and a rolling element interposed between an inner race and an outer race and held by a synthetic resin cage, both ends or one end on the outside of the cage. In addition, a tongue-shaped section which is in sliding contact with the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring is formed, and magnets are integrally embedded at a predetermined circumferential interval on both sides or one side of the outer end surface. A rolling bearing. 2. A rolling bearing having an outer race, an inner race, and a rolling element interposed between an inner race and an outer race and held by a synthetic resin cage, both ends or one side end outside the cage. In addition, a labyrinth sealing portion is formed between the inner peripheral surface of the outer race or the outer peripheral surface of the inner race, and magnets are integrally embedded in the mold on both sides or one side of the outer end surface at a constant circumferential interval. A rolling bearing, characterized in that: