JPS6350485Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] "Field of industrial application" This invention relates to a radial ball bearing unit.

``Prior art'' Radial ball bearings used in automobile steering column bearings, etc., may have large variations in the inner diameter dimensions of the steering column pipe that serves as the mating bearing housing, or poor surface roughness. A large gap may be created between the pipe and the outer diameter of the bearing, which may cause problems such as vibrations or tapping sounds in the steering wheel when the engine is idling.

As a countermeasure against this, there are measures such as providing a groove 33 in the circumferential direction on the outer diameter portion of the outer ring 1 of the ball bearing, inserting an O-ring 34, and assembling it into the steering column pipe 31, as shown in FIG.

``Problem that the invention attempts to solve'' In order to install an O-ring in a bearing ring, a groove 33 must be provided, but providing such a groove requires the production of a special bearing, which is expensive. .
Further, even if the O-ring 34 is used, the bearing ring does not necessarily come into contact with the mating mounting part due to vibration, and is not sufficient as a countermeasure against vibration and hammering noise. Also, O-ring 3 like this
4 and a sealed bearing would be even more expensive.

The object of this invention is to provide a radial ball bearing unit that can be assembled without a gap between the mating part and the bearing when fitting with a mating part having a bearing mounting part with large variations in internal diameter.

[Structure of the idea]

This idea involves fitting the base of the case onto the outer periphery of the outer ring from both sides of the radial ball bearing, overlapping the ends of the base through a sealing ring, and fixing them with a snap fit.A tongue-like ring is attached to the outer periphery of the base of each case. Each case is a radial ball bearing unit in which a shaft seal is formed between a holding part that follows a base that contacts the side of the outer ring and an inner ring that follows the holding part.

"Embodiment" FIG. 1 is a longitudinal sectional view of an embodiment of this invention.
1 is an outer ring, 2 is an inner ring, and between raceways 3 and 4 each having an arcuate cross section, rolling elements 5 of balls are disposed in the circumferential direction by a cage 6. A chamfer 7 is provided on the outer corner of the outer ring 1, and a chamfer 8 is provided on the inner corner of the inner ring 2. On the side of the inner ring 2 adjacent to the inner circumferential angle, there is provided an oblique step 11 following a flat surface 9 perpendicular to the axis. A side surface 13 is provided.

Cases 14 and 15 are fitted into the outer ring 1 from the sides. The cases 14 and 15 are both made of synthetic resin, such as polyacetal resin or polyamide resin, and have an annular shape centered on the axis in the illustrated cross section.

The cases 14 and 15 have cylindrical bases 16 and 17 that are press-fitted onto the outer periphery of the outer ring, respectively.
The end 1 of the base 17 is on the outside (outer diameter side) of the end 18 of the
9 is stacked so that the end 18 of the base 16
is in contact with the base 17. Projections 21 and 22 are provided on the outer periphery of the tip of the end 18 of the base 16 and the inner periphery of the tip of the end 19 of the base 17, and the end 18 between the ridges 21 and 22 and between the ridges 21 and 22, A sealing ring 23 is fitted into the space surrounded by the space 19. Therefore, the cases 14 and 15 are assembled by the protrusion 21 pushing out the protrusion 22 toward the outer diameter, elastically deforming the base end 19 of the case 15, and fitting the case 15 with a snap fit. An axial gap is provided between the end 19 of the base 17 and the base 16.

On the outer periphery of the bases 16 and 17, annular tongue rings 24 and 25, each having a rectangular cross section facing in an oblique direction, are provided at the center of the axis.

The direction in which the tips of the tongue-shaped rings 24 and 25 approach each other is the direction of inclination.

Following the base parts 16 and 17, holding parts 26 and 27 are provided which abut on the sides of the outer ring 1.
From 6, 27, side seal parts 28, 29 that cover the space between the inner and outer rings and the side surface 13 and step part 11 of the inner ring 2 are attached to the inner ring 2.
It is provided with a small gap from the side surface 13 and the stepped portion 11.

FIG. 2 shows a case where the radial ball bearing unit 20 of FIG. 1 is attached to, for example, a steering column pipe 31 of an automobile. When the radial ball bearing unit 20 is inserted into the steering column pipe 31, the ends of the tongue-shaped rings 24, 25 are compressed against the elasticity of the tongue-shaped rings 24, 25 provided in the cases 14, 15.
4 and 25 are strongly pressed against the steering column pipe 31. Therefore, since the cases 14 and 15 are fixed to the steering column pipe 31, the inner outer ring 1 also becomes immovable with respect to the steering column pipe 31.

Steering shaft 3 fitted into inner ring 2
2 rotates, the inner ring 2 rotates together, the rolling elements 5 roll on the raceways 3 and 4 to rotate and revolve, and the cage 6 revolves. The side seals 28 and 29 move relative to each other with a small gap between the inner ring stepped portion 11 and the side surface 13, thereby exhibiting a dustproof effect.

[Effect of idea]

This idea has a case that fits into the outer circumference of the outer ring from both sides of the radial ball bearing, and a tongue-shaped ring is provided on the outer circumference of the case, so even if the dimensions of the bearing housing vary widely, the bearing can be installed in the bearing housing without any gaps. .

Since the case is provided with a side seal portion that covers the inner and outer rings and the sides of the inner ring and has a small gap between the inner and outer rings, it has a dustproof effect. Since the bearing is supported elastically, the permissible load against impact load increases. The case provides insulation, heat insulation, and vibration isolation between the mounting shaft and the bearing housing.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional views of an embodiment of this invention, and FIG. 3 is a longitudinal sectional view of a conventional example. 1... Outer ring, 2... Inner ring, 3, 4... Raceway, 5
... Rolling element, 6 ... Cage, 7, 8 ... Corner chamfer, 9 ... Plane section, 11 ... Step section, 12 ... Side surface of outer ring, 13 ... Side surface of inner ring, 14 ... Case,
15... Case, 16, 17... Base, 18, 1
9... End portion, 20... Radial ball bearing unit, 21, 22... Projection, 23... Sealing ring, 24, 25... Tongue ring, 26, 27...
Holding portion, 28, 29... Seal portion, 31... Steering column pipe, 32... Steering shaft, 33... Concave groove, 34... O ring.

Claims (1)

[Scope of utility model registration request] The base of the case is fitted onto the outer periphery of the outer ring from both sides of the radial ball bearing, and the ends of the base are overlapped with a snap fit via a sealing ring. A radial ball bearing unit in which the case is provided with a holding part that contacts the side of the outer ring following the base, and a shaft sealing part is formed between the holding part and the inner ring.