JPS6017541Y2 - Sealing device for rolling bearings with cages - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a rolling bearing having a cage.

In general, sealing devices are used to prevent lubricant from leaking from the housing, and to prevent dirt, metal wear particles, scale, water, gas, etc. from entering from the outside. It is an important element and has a great influence on the operating performance and durability of the bearing.

Furthermore, some bearings have a sealing device built in in advance, while others do not.

Deep groove ball bearings are equipped with sealing devices in the form of seal plates, but it is also possible to add seals such as oil seals to other types of rolling bearings without seals without changing their main dimensions. If provided, internal design changes such as reducing the length of the rolling elements will be required, resulting in a reduction in load capacity.

Furthermore, the number of parts increases and the price also increases.

FIG. 1 shows a conventional example of a double-row tapered roller bearing in which a seal is provided without changing the main dimensions of the bearing.

Figure a shows the state before the seal is attached, and Figure a shows the state after interest is applied.

In this bearing, a seat 2 for attaching a seal is provided by extending both flanges 1a of an inner ring 1, and a seal spacer 4 is arranged on both end surfaces of an outer ring 3, and a space between the seat 2 and the seal spacer 4 is provided. Seal 5 is attached to the

6 is a tapered roller, 7 is a cage, and 8 is an outer ring spacer.

This embodiment also has the disadvantage that the number of parts increases, and if the bearing width is kept constant, the load capacity decreases.

In view of the above-mentioned drawbacks of the conventional sealing device for a rolling bearing with a cage, the present invention has been developed to improve and eliminate the drawbacks.

The configuration of the present invention will be explained below according to the embodiments shown in the drawings.

It should be noted that the same reference numerals as in the prior art represent the same members.

FIG. 2 is a sectional view of a main part showing a first embodiment of the present invention applied to a double-row tapered roller bearing.

As illustrated in FIG. 2 and below, the present invention provides a tapered roller bearing with a cage in which an L-shaped annular flange extending radially inward is formed at the end of the small diameter side of the inner ring. an abbreviated annular groove that opens radially outward into which the part is fitted, and a seal lip part that is arranged to face each other so that its upper and lower ends are in contact with the outer circumferential surface of the end of the inner ring and the inner circumferential surface of the end of the outer ring. and a tapered surface for fitting into the retainer whose diameter decreases toward the larger diameter side of the inner ring. A sealing device for a fitted cage rolling bearing is provided.

In this case, the seal 9 is made of synthetic leather and rubber.

With this, it is possible to obtain a bearing sealing device with a simple configuration without changing the internal design such as shortening the length of the rollers, thereby suppressing the increase in the number of parts and the associated price hike. be able to.

FIG. 4 is a cross-sectional view of a main part showing a second embodiment in which the synthetic rubber seal 9 of the first embodiment is separated from the inner and outer rings 1 and 3 to provide a non-contact type.

In this embodiment, a part of the seal 9 has a lip 9a for draining water.
It consists of

Either the non-contact type or the contact type may be selected, and the decision may be made taking into consideration the circumferential speed on the sliding surface.

The other configurations and effects are the same as in the first embodiment.

In these embodiments, the tip of the lip seal portion includes:
A tapered surface 10 for fitting into the retainer 7 is formed, the diameter of which decreases toward the larger diameter side of the inner ring.

As can be understood from the above description, according to the present invention, the L-shaped annular flange of the retainer located on the small diameter side of the inner ring is directly fitted into the L-shaped annular groove of the seal that opens outward in the radial direction. Therefore, the seal can be configured to be detachable from the cage.

Therefore, when the seal becomes worn, it can be easily replaced with a new one, and the tightness and lip shape of the seal can also be easily changed regardless of the design dimensions of the tapered roller bearing.

Furthermore, according to the present invention, in the final assembly process of the inner ring, rollers, and cage of a tapered roller bearing, after the rollers are fitted from the outside of the cage, the pillars of the cage are crimped in the axial direction. Seals can be easily installed at the ends of the cage where it would not be possible to keep a seal attached after the assembly process has been completed.

In addition, the L-shaped annular flange extending radially inward of the cage located on the small diameter side of the inner ring is securely fitted into the L-shaped annular inner groove of the seal that opens radially outward. Therefore, even if a centrifugal force is applied to the seal, a reliable locking state can be maintained between the L-shaped annular flange and the L-shaped annular groove without slippage.

On the other hand, since the tip of the seal lip part is formed with a tapered surface 10 for fitting into the cage, the diameter of which decreases toward the larger diameter side of the inner ring, the seal can be fitted into the L-shaped annular shape of the cage with a slight pushing force. It can be attached to the collar.

In this way, according to the invention of the present invention, a sealing device can be obtained without changing the main dimensions of the bearing or without major internal design changes, and a tapered roller bearing with improved sealing performance can be produced at a low cost. may be provided.

Furthermore, since a seal is attached to the cage, the circumferential speed on the sliding surface is lower than that of conventional models, and the deflection of the cage during rotation is reduced.

This provides excellent protection against damage to the cage caused by external vibrations, high-speed rotation, rapid rotational speed fluctuations, etc.

[Brief explanation of the drawing]

Fig. 1a is a cross-sectional view showing the state of the double-row tapered roller bearing before the seal is installed, b is a cross-sectional view showing the state after the seal is installed, and Fig. 2 shows the first embodiment of the present invention. FIG. 3 is a cross-sectional view of a seal thereof, and FIG. 4 is a cross-sectional view of a main part of a double-row tapered roller bearing showing a second embodiment. 7... Cage, 9, 10... Annular seal.

Claims (1)

[Scope of utility model registration request] A tapered roller bearing with a cage is formed with an L-shaped annular collar extending radially inward at the small-diameter end of the inner ring, and the bearing opens radially outward into which the L-shaped annular collar fits. An abbreviated annular groove, a seal lip portion facing each other so that its upper and lower ends are in contact with the outer circumferential surface of the end of the inner ring and the inner circumferential surface of the end of the outer ring, and the diameter decreases toward the larger diameter side of the inner ring. A rolling bearing with a cage, characterized in that a seal made of an annular member made of an elastic material and having a generally C-shaped cross-sectional shape as a whole and a tapered surface for fitting into a cage is removably fitted. sealing device.