DE2361891A1 - PROCESS FOR ESTABLISHING AND RELEASING THE BODY BETWEEN A WHEEL AND A WHEEL AXLE AND BODY MANUFACTURED BY THE PROCESS - Google Patents

Description

Patent attorneys

Dipl.-Ing. Helmut MI se ling Dipl.-Ing. Richard Schlee Dr.-Ing. Joachim Boecker its 11.t2.1973

Biamarocatrasis 43 Telephone: (0641) 71059

Bo © / Kü 11.875

Allmänna Svenska ElektriskaAktiebolaget ■ ' ¥ äst β ga s / Sweden _m

Process for producing and cutting the

between. © inen

and. one -

The invention relates to © 1® IF ®vt ote ^{1 © ©}

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as well as aaefe das. Ea € Eit äas ³

on the Radaehs © soloher

eventually press ρ

have been solved ρ s @ is © i ³ gna ^ insaderge

Such a 'lying when removing the wheel © n the property ^ nd / or putη has Man dl © l <eh © n »3 © i dem dafeei'oft damage

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'0'RIQINAL INSPECTED

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this procedure is more hand-carried because of the uneven durability of the dressing and the need for it Operations.

In conical journal has mounted in other were connected and a sleeve loosely around the bush is clamped by means of shrinkage or pressure oil to the rest of the dressing _t equal to a clutch or a bearing. A splclier Association is easily solved, however, relatively complicated to manufacture. It is therefore not very suitable for iron bathing wheels. Kit, with varying degrees of success, has also been manufactured for this purpose _f where msm. no metal sleeve

It has also railway wheel Associations © leads it a Btaohs © which is a cylindrical hole feat "ad shrunk l to what the wheel with the .Radnabe the sleeve is shrunk. Ak. There is a pressure oil hole in the area between the bushing and the wheel. and during dismantling, the wheel is pulled down from the base bevel with the help of BruGkSl, which remains on the hub seat of the wheel base. If a part attached to the wheel axle behind the wheel is to be removed from this association, the bushing usually has to be twisted off the wheel axle first. This method can be used for a standard axis without a gearbox behind it.

Such associations are also available without Druel £ uleinri @ ^ tmig _r 'where the socket is first on a éiie Äeiis © msxgBB & s ^ ismS ^ and

469826/9886 ° «™ * ^{L INSPECTED} "

Pressing off the wheel remains seated on the axle.

In dressings where the bushing is mounted in the hub ₉ , it often happens during dismantling that the pressure oil is distributed over both surfaces of the bushing * It is then uncertain whether the wheel will come loose from the bushing as intended or the wheel and the sleeve come loose from the axle.

When pressure oil associations in connection with cast iron parts are used, the pressure oil must be prevented from reaching the cast iron, otherwise there is a risk that the oil penetrates into the pores of the cast iron. For cast iron associations Therefore, sealing rings or other sealing elements are required on the cast iron surfaces.

The invention is based on the object of developing a process and a dressing of the type mentioned, in which the disadvantages of the known methods and associations discussed _β do not occur.

To solve this problem, a method is proposed that is characterized in that in the inside of the A cylindrical bushing is shrunk in on the wheel hub and that the composite body thus obtained is placed on the wheel, Axle is shrunk on, with the bushing made of a softer material than the wheel axle. To solve the

409825/0888

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According to the invention, the dressing is pressurized oil into a channel pumped, which is in connection with the surface between the bushing and the wheel axle. So the wheel comes together with the Sleeve detached from the axle, after which the bearing rings and other parts mounted inside the wheel can be checked of the wheel can decrease. In a preferred embodiment of a bandage produced by the method there is a duct for pressure oil in the bushing, which communicates with the surface between the bushing and the axle stands, however, has no connection to the hub. When pumping in When DruGköl enters the channel, the hub and the sleeve are released from the axle and can then be pulled off the axle will.

“Shrinking ^11” is also understood to mean cold shrinking (freezing).

With reference to the figures, the two embodiments of the shrink bandage produced according to the method according to the invention show, the invention is to be explained in more detail:

Figure 1 shows a wheel hub 1 into which a bushing 2 is shrunk whose material is softer than that of the wheel axis 3 is. The one consisting of wheel hub 1 and socket 2 composite body is mounted on the wheel axle 3

A09825 / 0886 - 5 -

shrinks. The socket 2 is expediently at least 25 Brinell, but preferably at least 100 Brinell softer than the hub seat of wheel axle 3. If the difference between the degrees of hardness is too small, there is a risk a weld. In the socket, a pressure oil channel 4 is arranged, which has no connection with the inner Has surface of the wheel hub, but is in communication with a groove 5 in the wheel axle. When loosening the shrink bandage oil is pumped into the channel 4, whereupon the wheel hub 1 together with the bushing 2 is detached from the wheel axle and an inspection of the warehouse can be carried out.

In the alternative embodiment of the invention according to FIG Job. However, this embodiment requires a greater casting thickness for the bushing 7 than for the bushing in the embodiment according to Figure 1. ■

The bushing is shrunk into the hub and thereby permanently attached to the hub, usually with a Degree of shrinkage between 0.5 and 1 per thousand is applied. Between the hub and socket on the one hand and the wheel axle on the other the degree of shrinkage should be around 1 per thousand. As mentioned, the socket should have a lower hardness than the Have wheel axle 3 to reduce damage during disassembly.

409825/0886 "^"

A possibly damaged socket can easily be replaced here. The softer material has as well a favorable influence on the fatigue strength.

As mentioned, the hardness of the bushing is preferably about 100 Brinell less than that of the wheel axle. There may also be a slight difference to the hub, but the importance of the same is less. The first difference is to avoid cold welding between the axle and the bushing, and this is achieved by a difference in hardness.

The bushing thickness should be at least 5 mm in order to achieve the To enable attachment of the pressure oil hole and pumping through of the oil. In relation to the procedure with Monell spraying offers this process the possibility of series production, for example of the bushings.

As a material example, SIS 2244 with a

p breaking strength of at least 75 kp / mm. The Nabt can for example in a material SIS 2120 and the with

ρ a breaking point of about 30-45 kp / mm.

Wheels of the type described are especially suitable as drive wheels in railway operations, but the shrink fit can also be used for wheels for other purposes, e.g. in gears or various coupling details.

409825/0886

In the case of the known shrink bandages, micro-movements often result in cold welding between the wheel axle and hub on the inside of the hub. This disadvantage is eliminated by the method according to the invention.

The invention can within the scope of the inventive concept disclosed can be varied in many ways.

409825/0886

Claims (5)

-. 8 - ■ ■ Claims 1 J Procedure for making and loosening the dressing
between a wheel and a wheel axle, characterized in that a cylindrical sleeve is shrunk into the inside of the wheel hub and that the composite body thus obtained is shrunk onto the wheel axle, the sleeve being made of a softer material than the wheel axle
consists. 2. The method according to claim 1, characterized in that
To loosen the association, pressure oil is pumped into a channel that is connected to the surface between the bushing and the wheel axle. 3. Association between a wheel and a wheel axle, produced according to the method according to claim 1, characterized in that that a bushing (2) is shrunk into the wheel hub (1) whose material is softer than that of the wheel axle (3), and that the assembled body of wheel hub (1) and bushing (2) is shrunk onto the wheel axle (3). 4. Association according to claim 3, characterized in that the bush (2) consists of steel and its hardness by at least 25 Brinell is less than the hardness of the wheel axle (3) 409825/0886 5. Association according to claims 3 or 4, characterized in that that in the socket (2) a pressure oil channel (4) is arranged in a known manner, which exclusively with the area between the bushing (2) and the wheel axle (3) in Connection. 409825/0886 L e r s e i t e