Electric heating – Metal heating – Of cylinders
Patent
1988-03-29
1991-06-25
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1057, 219 1075, 219 1079, 29244, H05B 614
Patent
active
050269569
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for removing rings from shafts on which the rings are mounted, and more particularly to an improved heat accumulator, the heat of which can be transfered to the ring to be removed to expand same and free it from the shaft on which it is mounted.
Heat accumulators have been previously employed to heat the inner race ring of an antifriction bearing which is secured on a shaft in order to cause thermal expansion of the ring so that it may be easily pulled off the shaft.
Heat accumulators of this type are well known. The action of the force is exerted by means of a special-purpose clamping device which contracts it to a smaller diameter.
Such prior art heat accumulators have been heated by being exposed to the direct thermal action of a source of heat. Unlike the heating up of antifriction bearings prior to mounting them on a shaft it is necessary for heat accumulators to be heated to a substantially higher temperature than the antifriction bearings to that after clamping onto the ring to be pulled off they are still able to transfer a sufficient quantity of heat to the latter. One fraction of the stored heat is lost during the time between detaching the heat accumulator from the source of heat and firmly attaching the heat accumulator to the ring is to be removed, and another fraction of the stored heat remains in the heat accumulator, since the latter only transfers heat to the ring to be removed until there is a temperature equilibrium.
In the past the sources of heat have been oil baths and burners. Oil baths are inconvenient to handle and leave an oil film which has to be removed at least partially before clamping the heat accumulator on the ring to be removed and heating by means of a burner gives rise to problems as regards reaching a precise working temperature.
Resistance heating using a welding transformer or the like hardly comes into question owing to the unavoidable local overheating at the electrode contact points due to the accompanying risk of damage to the heat accumulator.
SUMMARY OF THE INVENTION
It is with the above problems in mind that the present improved ring puller has been developed. The instant ring puller is formed of steel which as compared to aluminum has a relatively low specific heat and thermal conductivity, whereby it may be inductively heated with great efficiency. The steel ring is transversely slotted and a conductor is extended accross the slot. A clamp is provided to bring the slotted ring ends together. In use, the ring puller is inductively heated and arranged in heat exchange relationship with the ring to be removed so that the heat of the ring pulled may be transferred to the ring to be removed to expand and free same from the shaft on which it is mounted.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be explained in detail with reference to two working embodiments thereof, as illustrated in the accompanying drawings, wherein:
FIG. 1 shows a first working example of the heat accumulator in accordance with the invention in perspective to indicate the built-in clamping device and of the handle for transport and handling and also showing the part carrying the magnetic alternating flux as part of the device for inductive heating, on which the heat accumulator is placed.
FIG. 2 shows the contact area for mounting a temperature sensor together with the adjacent part of the heat accumulator as seen from the side.
FIG. 3 is a perspective view of a second form of the heat accumulator.
DESCRIPTION OF PREFERRED EMBODIMENT
The heat accumulator as shown in FIG. 1 consists of a steel ring 1 with a continuous transverse slot 2, the ends of the steel ring adjacent to the slot 2 being formed as eyes 1a which surround pins 3 to which the clamping device 4 is applied. The latter makes it possible to contract the ring by pressing down the handle 4a out of the position shown in FIG. 1 so that the ring 1 then has a smaller diameter. This operation is undertaken only after the heating up of the steel ring 1 to the working temperature on
REFERENCES:
patent: 1607675 (1926-11-01), Jefferies
patent: 1636448 (1927-07-01), Whipple
patent: 2610287 (1952-09-01), Robson
patent: 2933584 (1960-04-01), Thielsch
patent: 4529869 (1985-07-01), Ekstrom, Jr.
Die Kugellager Zeitschrift, vol. 40, Nr. 146, 1965, (Veenendaal), (NL), "Neues Abziehwerkzeug fur Innenringe von Zylinderrollenlagern", pp. 11 and 12.
Fiddler Robert W.
Leung Philip H.
Pruftechnik Dieter Busch & Partner GmbH & Co.
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