Bearings – Rotary bearing – Antifriction bearing
Patent
1989-01-23
1990-04-03
Footland, Lenard A.
Bearings
Rotary bearing
Antifriction bearing
384903, F16C 1910
Patent
active
049135651
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a thrust bearing arrangement, in which a thrust bearing is brought to a given position on an axle or a shaft and subsequently secured in said position.
Normally, a thrust bearing is moved to a given setting or position on an axle and secure preliminary in this position by means of washers, shims or like devices, whereafter a locking ring is screwed along the axle into locking abutment with the bearing. This procedure, however, is highly time consuming and also assumes that the setting of the thrust bearing can be checked in some way or another.
The object of this invention is to provide a thrust bearing arrangement of the aforesaid kind which will enable the thrust bearing to be brought to a given position or setting on an axle and quickly secured in said position in a simple manner.
SUMMARY OF THE INVENTION
According to the present invention, a specific clearance is set between an end wall of a rotor and an inner surface of a high pressure end wall of a screw rotor compressor while mounting an axle of said rotor in a thrust bearing in a bearing seating in said high pressure end wall by providing the high pressure end wall of the screw rotor compressor with an access space to provide radial access to the bearing seating; and transversely inserting a feeler gauge in the radial access space at one or another end surface of the thrust bearing. The rotor is into abutment with the inner surface of the high pressure end wall; a separate heated shrink ring is pushed over the axle of the rotor and pressed against the thrust bearing with the feeler gauge still in position in the radial access space at an end surface of the thrust bearing; and then the feeler gauge is removed after shrink ring has cooled down.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawing, the single FIGURE of which illustrates in longitudinal section a screw compressor provider with a thrust bearing arrangement according to one embodiment of the invention.
DETAILED DESCRIPTION
The illustrated screw compressor comprises a housing 1 which incorporates a high-pressure end wall 2. An end wall 3 is screwed firmly onto the low pressure side and the high-pressure end wall 2 carries a casing 4. A male rotor 5 and a female rotor 6 are rotatably journalled in the housing 1, in radial bearings 7.
The rotors 5, 6 are provided on the high pressure side with respective bearing trunnions 15, 16 which extend externally beyond the high-pressure end wall 2. A respective thrust bearing 17, 18 is mounted on each of the outwardly projecting trunnions 15, 16. Each of the thrust bearings comprises a rolling bearing having a respective inner race 19 and 20, which is slideably mounted on a respective trunnion 15, 16, and an outer race 21 and 22 which abut the outer surface of the end wall 2. A locking ring 23 and 24 is shrink-fitted on a respective trunnion in abutment with a respective inner race 19 and 20.
All play, or clearance, between the shrink rings 23, 24, the thrust bearings 17, 18 and the outer surface of the end wall 2 is eliminated when the rotors 5, 6 are urged in a direction towards the low-pressure end wall 3, while an intended clearance a of 0.04-0.05 mm is obtained between the inner surface of the end wall 2 and the high-pressure end surfaces of the rotors 5, 6 when the shrink rings 23, 24 are locked to the trunnions 15, 16 in precisely the correct position.
This thrust bearing arrangement to produce the above results is achieved quickly and easily, by simply displacing the rotors 5, 6 into abutment with the inner surface of the high-pressure end wall 2, prior to fitting the shrink rings, by appropriate manipulation of the low pressure trunnions, to which access could be obtained via a belt pulley 25 mounted on the low pressure trunnion 26 of the male rotor 5 and by removing a cover plate 27 outside the low pressure trunnion 28 of the female rotor.
Casing 4 is removed from the high-pressure end wall 2 to p
REFERENCES:
patent: 3397021 (1968-08-01), Fitzsimmons
patent: 4613240 (1986-09-01), Hagelthorn
patent: 4732497 (1988-03-01), Sawa et al.
Footland Lenard A.
Svenska Rotor Maskiner AB
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