Bearings – Rotary bearing – Antifriction bearing
Patent
1999-03-22
2000-10-17
Ta, Khoi Q.
Bearings
Rotary bearing
Antifriction bearing
384127, 384584, F16C 1908
Patent
active
061321036
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to rotor provided with bearing trunnions, which rotor is made of lightweight material having limited strength properties.
When rotors are made of a material with limited strength properties in comparison to steel, some problems are involved in the provision of the bearing trunnions. If the bearing trunnions are made of the same material as the rotors and integrated with the rotors, e.g. of aluminum, magnesium, plastics or ceramic material, the bearing trunnions will get an unpractically large diameter and so also the bearings. This disadvantage is particularly obvious at journalling of the low pressure ends of the rotors in screw compressors provided with axial inlet ports, the design of which is restricted by bearing trunnions and bearings having a large diameter. The provision of axially positioned screws for reinforcing the bearing trunnions has been tested, but this has not been sufficient for avoiding harmful flexural stresses to the bearing trunnions. Steel shafts passing through especially plastic rotors have been used, resulting in sufficient bending strength, but at the same time resulting in an increased rotor weight where low weight is desired.
The object of the present invention is to achieve in a simple way rotors having bearing trunnions which have a comparatively small diameter but at the same time a great strength property, especially bending strength.
SUMMARY OF THE INVENTION
According to the present invention, a rotor is provided with a plurality of bearing trunnions (4,5). The rotor is made of a lightweight material having limited strength properties. At least one (4) of the trunnions (4, 5) comprises a concentric sleeve (20) located at one end of the rotor. The sleeve (20) has an inner end (21) which is radially fixed by a guide (4,40) at the one end (22) of the rotor, and the sleeve (20) has an outer end positioned by a clamping surface (23) acted upon by a head (24) of a screw (25) that extends into a threaded boring (28) in the one end of the rotor. the head (24) of the screw bears axially against the outer end of the sleeve (20) and keeps the sleeve (20) pressed against the one end (22) of the rotor.
According to a preferred embodiment of the invention, the sleeve comprises an inner race of a radial bearing (30).
According to another embodiment of the invention, the guide comprises a hollow trunnion (4) protruding from the one end of the rotor, and the hollow trunnion has essentially the same outer diameter as the inner diameter of the sleeve (20).
According to an alternative embodiment of the invention, the guide comprises an annular groove (40) in the one end of the rotor, into which groove (40) the inner end portion (21) of the sleeve protrudes.
According to another feature of the invention, the screw head (24) has an underside which is provided with an alignment spacer (29) which protrudes into the outer end of the sleeve (20). The spacer preferably has an outer diameter which is substantially the same as the inner diameter of the outer end of the sleeve for close engagement with the sleeve and for centering the sleeve. The spacer (29) faces the clamping surface (23) on the underside of the screw head (24).
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in further detail below with reference to the appended drawings, which show various embodiments of rotors according to the invention;
FIG. 1 is a side view of a screw compressor with a housing, bearings and clutch, shown in section,
FIG. 2 is a detail of FIG. 1 shown on a larger scale, and
FIG. 3 is a modification of the embodiment shown in FIG. 2.
DETAILED DESCRIPTION
FIG. 1 shows a screw compressor with a housing 1, in which a male rotor 2 and a female rotor 3 are journalled with bearing trunnions 4 and 5, respectively, in a low pressure end wall 6 and a high pressure end wall 7.
Each bearing trunnion 5 is journalled in a combined thrust and radial bearing 8 whose inner race 9 together with a spacer sleeve 10 abut the bearing trunnion 5 and are ke
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Lysholm Technologies AB
Ta Khoi Q.
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