JPH0440045Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shaft sealing device between an axle of a gear device for a railway vehicle.

[Conventional technology]

An example of a conventional shaft sealing device is shown in FIG. 4, for example.

FIG. 4 is a sectional view showing a shaft sealing device between the axle and the axle of a conventional gear device for a railway vehicle.
2a is a bearing, 2a is a bearing inner ring fitted on the axle 1, 2b is a bearing outer ring fitted on a bearing presser cover 3, 4 is an oil drainer, 5 is a gear box, and 6 is a bearing fitted on the axle 1. It is a big gear.

In FIG. 4, the inner diameter part of the bearing presser cover 3 forms a labyrinth part between it and the oil cutter 4 fitted on the axle 1, and the outer diameter part is fastened to the gear box 5.

Thus, the function of the shaft seal device configured in this way is that lubricating oil is held in the gear box 5,
The rotation of the large gear 6 scatters the oil and lubricates the bearing 2. However, some of the oil applied to the bearing 2 passes through the bearing as shown by the arrow and reaches the air section A, and is transferred to the labyrinth section B. Leakage to the outside is prevented.

[Problem that the invention attempts to solve]

However, in the conventional shaft sealing device, in order to inspect the bearing 2, it is necessary to remove the bearing presser cover 3 into which the bearing outer ring 2b is fitted, so the outer diameter of the oil drain 4 is smaller than the inner diameter of the bearing outer ring 2b. must also be small. Therefore, it is not possible to increase the outer diameter of the oil sluice 4, and the oil sluice 4 passes through the bearing 2 into the space A.
There was no effect to shake off the lubricating oil flowing into the area.

Therefore, since prevention of oil leakage relies only on the shaft sealing effect of the labyrinth portion B, which is composed of slits, there is a problem in that oil leakage occurs during use.

The present invention was devised in view of the above points, and its purpose is to eliminate oil leakage from the labyrinth part B, to have a reliable oil leakage prevention effect,
Moreover, the present invention provides a shaft sealing device having a structure that allows easy inspection of bearings.

[Means for solving problems]

In other words, the means to achieve this purpose was that the conventional shaft seal device had no oil cutting function because the outer diameter of the oil drain had to be made smaller than the inner diameter of the outer ring of the bearing. A bearing holder is installed further outside the first stage labyrinth, which is formed by a gap between the inner diameter of the bearing holder located on the outside and the outer diameter of the collar that is fitted onto the axle and presses the bearing inner ring in the axial direction. A swing-off ring having an outer diameter sufficiently larger than the inner diameter of the lid labyrinth part is fitted into a shallow groove that is wider than the axial thickness of the swing-off ring cut into the outer diameter of the collar, and the swing-off ring is inserted into this shallow groove. A ring-shaped snap spring cut at one point on the circumference is fitted into the remaining width portion after fitting the ring to fix the swing-off ring in the axial direction. The inner diameter of the swing-off ring is molded or glued with a flexible material such as rubber so that it can be easily removed from the collar when inspecting the bearing. It is only necessary to push it in lightly, and it is designed so that it can be easily removed using a pull-out tap after removing the snap ring.

The outside of the shake-off ring is surrounded by a small lid that is fastened to the bearing presser lid, and the inner diameter of the small lid forms a labyrinth having a narrow gap with the outer diameter of the outer end of the collar.

[Effect]

Its action is described below.

(1) The first stage oil drain, which is closest to the bearing, prevents oil leaks.

(2) Shake off the oil that leaks through the oil drain with a large diameter shake-off ring.

(3) The labyrinth between the small lid on the outside of the shake-off ring and the collar prevents oil leakage.

In order to construct a shaft sealing device having such an effect, the inner diameter of the swing-off ring is molded or glued with a flexible material such as rubber, and the ring is connected to the fitting part of the collar into which it is fitted. By providing an appropriate amount of interference between the two rings, creating a fitting force that is comparable to a light tap with a hammer, and further fixing the ring in the axial direction with a snap spring, it was possible to obtain a ring that is easy to install and remove.

By using such a swing-off ring that is easy to insert and remove, it becomes possible to easily inspect the bearing, and the shaft sealing device having the structure of the present invention has become practical.

Hereinafter, one embodiment of the shaft sealing device of the present invention will be described in detail based on the drawings.

〔Example〕

Fig. 1 is a cross-sectional view showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the swing ring of the present invention, Fig. 3 A and B show a snap spring, and Fig. 3 A is a plan view thereof. FIG. 3B is a cross-sectional view, and in the figure, the same reference numerals as in FIG. 4 indicate parts having the same configuration and function.

In Figures 1 to 3, 10 is the bearing outer ring 2b.
This is a bearing retaining lid that is fitted and fastened to the gear box 5, and the inner diameter side of the bearing retaining lid 10 has a narrow gap between it and the outer circumference of the collar 11 that is fitted onto the axle 1 and fixes the bearing inner ring 2a. A labyrinth is formed by maintaining gaps. A wide and shallow groove 11a is cut on the middle part of the outer circumference of the collar 11, that is, on the outside of the labyrinth part with the bearing presser cover 10, and furthermore, the outer circumference of the collar 11 has a small lid 12 fastened to the bearing presser cover 10. A labyrinth is formed between the inner diameter part of the A flexible material such as rubber is molded or glued onto the inner diameter of the shallow groove 11a in the middle of the collar 11, and a shake-off ring 13 having an outer diameter larger than the inner labyrinth part of the bearing presser cover 10 is fitted. A ring-shaped snap ring 14 cut at one point on the circumference is fitted into the remaining groove portion of the wide shallow groove 11a into which the swing-off ring 13 is fitted, fixing the swing-off ring 13 in the axial direction. . Further, 10a is an oil return hole drilled in the bearing presser lid 10, and 12a is a small lid 1.
This is the oil return hole drilled in 2.

FIG. 2 shows the swing-off ring 13 shown in FIG.
3a is a metal main body, 13b is a flexible material such as rubber molded or bonded to the inner diameter of the main body 13a, and the inner diameter is the same as the groove 11a in the middle of the collar 11.
A shallow groove 1 with an appropriate clearance for the outer diameter of the part.
It is designed so that the swing-off ring 13 can be removed from 1a. Reference numeral 13c is a tapped hole into which a bolt is inserted and the swing-off ring 13 is removed. Further, the waving ring 13 can be inserted by tapping lightly with a hammer, and can be removed by removing the snap spring 14, inserting a bolt into the tap hole 13c, and pulling it by hand. .
Therefore, when inspecting the bearing 2, it is sufficient to simply pull out the snap ring 14 and the swing-off ring 13, and then remove the bearing presser cover 10.

Next, its effect will be explained.

A portion of the oil that lubricates the bearing 2 passes through the bearing due to the rotation of the large gear 6, but oil leakage is prevented by the labyrinth formed by the inner diameter of the bearing presser cover 10 and the outer diameter of the collar 11. . However, the oil leaking from this labyrinth part is shaken off by the centrifugal force by the shake-off ring 13 located outside the labyrinth part, and the space B made up of the bearing presser cover 10 and the small cover 12
and is returned to the gear box via the return holes 12a and 10a.

The swinging effect of the swinging ring 13 increases as the outer diameter of the ring increases, so the oil passing through the first stage labyrinth is completely shaken off by the large diameter swinging ring 13 of the shaft sealing device of the present invention. The inner diameter of the small lid 12 and the collar 1 located further outside the shake-off ring.
There is no oil leakage from the labyrinth part, which has an outer diameter of 1, and a great effect can be obtained as a shaft sealing device. In conventional shaft sealing devices, when disassembling and reassembling the bearing presser cover, there is a restriction that the outer diameter of the oil cutter 4 must be smaller than the inner diameter of the bearing outer ring 2b, so it is not possible to install a swing ring with a large outer diameter. First, reliable shaft sealing cannot be achieved because the oil leakage prevention effect is relied on only in the labyrinth portion.

In the shaft sealing device of the present invention, a swing ring 1 whose inner diameter is molded or bonded with a flexible material such as rubber
3 and a snap spring 14, which facilitates the insertion and removal of the swing-off ring 13 into and out of the collar 11, so that a swing-off ring 13 having a larger diameter than the inner diameter of the bearing cover 10 is attached to the outside of the bearing presser cover 10. It becomes possible to attach the cutting ring 13, and the cutting effect of the cutting ring 13 enables reliable shaft sealing.

In addition, in this embodiment, the collar 1 fitted on the axle 1
However, the collar 11 may be omitted and the deflection ring 13 may be fitted directly onto the axle 1 in the same manner.

[Effect of idea]

As explained above, according to the present invention, the large-diameter swing ring 13, which is characterized by having a flexible material such as rubber molded or bonded to the inner diameter part that can be easily inserted and removed, is used as a bearing presser. By placing it outside the labyrinth of the lid 10, there is no problem in inspecting the bearing, and the large-diameter swing ring 1
3. The swing-off effect enables reliable shaft sealing, and the practical benefits are enormous.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the shaft sealing device of the present invention, FIG. 2 is a cross-sectional view of the swing ring of the present invention,
3A and 3B show a snap spring, FIG. 3A is a plan view thereof, FIG. 3B is a sectional view, and FIG. 4 is a sectional view showing an example of a conventional snap spring. 1... Axle, 2... Bearing, 3, 10... Bearing presser cover, 4... Oil drainer, 5... Gear box, 6... Large gear, 11... Collar, 12... Small lid, 13...
...Furikiri ring, 14...Snat spring, 13
b...Flexible material.

Claims (1)

[Scope of utility model registration request] In a shaft sealing device for a gear device for a railway vehicle, a flexible material such as rubber is molded or glued on at least the inner diameter portion further outside the labyrinth portion provided between the bearing presser cover and the collar fitted on the axle. , a swing-off ring whose outer diameter is larger than the inner diameter of the labyrinth part of the bearing presser cover is provided, and this is fitted to the collar, and the fitting portion of the swing-off ring to the collar is arranged in the collar so that the axial dimension of the swing-off ring is A wider and shallower groove is cut, a furikiri ring is fitted into this groove, and a snap ring cut at one point on the circumference is fitted into the remaining part of the groove to fix the furikiri ring. A shaft sealing device further comprising a small lid attached to the bearing presser lid, the small lid having a labyrinth portion whose inner diameter forms a narrow gap between the inner diameter and the collar.