JPS5848417Y2 - Thrust bearing sealing device - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of sealing devices for thrust bearings such as thrust cylindrical roller bearings, thrust tapered roller bearings, and thrust ball bearings used in king pins. To provide a sealed thrust bearing in which old grease in the bearing can be easily pushed out and discharged when replenishing grease or replacing grease in the bearing.

Next, an embodiment of the thrust roller bearing sealing device of this invention shown in FIGS. 1 to 3 will be explained. 1 is one race (inner ring), 2 is the other race (outer ring), 3 Roller, 4 is the case, 5 is the seal body,
6 is a king pin, and 7 is a bearing seat.

The case 4 is fitted and fixed to one race 1, and the end on the opposite side overlaps the outer peripheral surface of the other race 2 in the axial direction, so as to surround a part of the circular surface of the other race 2. installed on.

As shown in FIG. 2, the seal body 5 has a fixed part 51 that bulges outward in the radial direction at one end in the axial direction, and one race 1 at the opposite end. It is formed with a seal lip 52 that comes into sliding contact with the inner surface of.

As shown in FIGS. 2 and 3, the fixing portion 51 is filled with grease that does not obstruct the passage of grease (grease pushed out from inside the bearing during grease replenishment or replacement can pass through). Notch part 511 as a passage part,
511... is formed.

In the seal body 5 formed in this way, for example, as shown in FIG. The seal lip 52 contacts the circumferential surface to seal the other race 2 side, and the seal lip 52 comes into sliding contact with the inner surface (lower surface) of one race 1 to seal the one race 1 side, forming the sealing device of this invention. .

As described above, in the thrust bearing sealing device of this invention, the seal body has a fixed part that bulges in the radial direction on the ring seal lip side (fixed side of the seal body), and the fixed part is located inside the case. Since it is fixed, the positioning of the seal body is of course reliable, and the fixed part is formed with an appropriate number of grease passage parts that communicate between the space B on the case side and the outside of the bearing. For example, in a king pin thrust bearing device as shown in FIG. 1, when grease is supplied to the bearing, the grease flows in the direction of the arrow due to the grease supply pressure, causing the seal lip 52 to open outward. The grease is pushed out into the space B on the case side, and the pushed out grease is passed through the grease passage parts 511, 511 of the fixed part.
. . . and is discharged to the outside of the bearing for grease replacement.

Therefore, not only is it easy to replenish and replace grease with a small supply pressure, but the bearing is always lubricated with new grease, so there is no trouble caused by deteriorated old grease, and the life of the bearing can be extended. Can be done.

In particular, the grease passing portion does not directly communicate between the inside of the bearing and the outside of the bearing, but communicates with the outside of the bearing through a space B formed on the case side. Since the inside of the bearing and the outside are sealed by a seal lip, the grease inside the bearing does not flow out through the grease passage part during use.
Can withstand long-term use.

Although the seal body 5 in the embodiment was attached in contact with the case, in consideration of ease of assembly, it may be attached with some clearance between it and the case.

In addition, the grease passage part is not limited to a notch, and in short, there is no particular limitation to this shape as long as the grease can pass through to the outside. may be implemented with appropriate modifications within the scope of the claims.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of the essential parts showing the sealing device of the thrust bearing of this invention, Fig. 2 is a partial sectional view of the seal body of the bearing shown in Fig. 1, and Fig. 3 is taken from A-A in Fig. 2. FIG. In the symbols of the embodiment, 1 is one race (inner ring), 2 is the other race (9'4r wheel), 3 is a roller, 4 is a case, and 5 is a sealing body.

Claims (1)

[Scope of utility model registration request] A rolling element 3 is provided between one race 1 and the other race 2, and the other race 2 is surrounded by a case 4 fitted to the one race 1.
and the other race 2, a fixing portion 51 is located on the other race 2 side and bulges outward in the radial direction and contacts the other race 2 and the case 4; It has a seal lip 52 located on the race 1 side and in contact with the one race 1, and in the fixing part 51, there is a space B on the case side formed by the seal lip 52, the case 4, and the fixing part 51. A sealing device for a thrust bearing that is sealed by a seal body 5 having an appropriate number of grease passage portions 511, 511, . . . communicating with the outside of the bearing.