Bearings – Rotary bearing – Antifriction bearing
Patent
1999-02-01
2000-12-12
Hannon, Thomas R.
Bearings
Rotary bearing
Antifriction bearing
74421R, F16C 4102
Patent
active
061588970
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a gear.
BACKGROUND OF THE INVENTION
From the prior art, minimization of the bearing play is known by using a separate transfer mechanism, a screw device, by whose means the play is minimized by shifting the bearing race in the lateral direction. In the prior-art solutions, the shifting of the bearing race takes place expressly by means of a separate positioning actuator.
OBJECTS AND SUMMARY OF THE INVENTION
In the present patent application, attempts have been made to find a solution for the problem of bearing play, in particular in a gear in which the gear comprises a high-speed shaft and a low-speed shaft, in which connection the high-speed shaft is fitted to rotate the low-speed shaft. The low-speed shaft is mounted from both sides of the toothed rim by means of rolling ball bearings. In a prior-art solution of said sort, in particular with increasing speeds, problems arise in the bearings of the low-speed shaft. In particular in paper machine drives, when temperatures vary, the bearing plays must be adequate in order that a reliable operation of the bearing could be guaranteed under all conditions of operation. In a gear, it is possible to speak of a load effect point at the point at which the high-speed shaft is in contact with the low-speed shaft. In a normal situation of loading, attempts are made to minimize the forces applied to the bearings by balancing the gear by means of a torque support from a suitable point on the outside frame constructions. When the balancing is successful, the bearing fully relies on its plays and is, in such a case, susceptible of oscillation. In such a case, outside impulses produce an increased risk of damage in the bearing means. When the gear is used in a paper machine drive, high changes in the thermal load arise on the grooved ball bearings placed at both sides of the gearwheel of the low-speed shaft, which changes further result in a requirement of a large play. When the play becomes larger, some of the rolls glide along the race track, in which case bearing damage and bearing wear are increased. According to the present invention, the service life of the bearings of the low-speed shaft has been increased by using a separate spring device in the lateral shifting of the bearings. The spring device is fitted so that its springs act upon the bearings of one of the bearing races, so that the spring force is applied outwards from the area between the bearings and upon the outer bearing race. The bearing race is mounted by means of a glide fitting on the frame of the bearing housing, and by means of the springs the bearing race is shifted outwards in the construction. In this way the bearing play is eliminated and the rolling members are shifted into contact with their bearing races, both with the inner bearing race and with the outer bearing race. When the rolling members are shifted into contact with the inner bearing race, the force acts upon the gearwheel shaft connected with the inner bearing race, and the inner race of the other bearing is now further shifted, in its turn, so that the shifting takes place towards the vertical central axis Y of the bearing. Thus, by means of the same spring device, the plays are eliminated from two sets of bearing means, both from one side and from the other side of the gearwheel.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in the following with reference to some preferred embodiments of the invention illustrated in the figures in the accompanying drawings, the invention being, however, not to be confined to said embodiments alone.
FIG. 1 illustrates the situation occurring at the load effect point in a bearing construction.
FIG. 2A is a sectional view of a gear construction in accordance with the present invention.
FIG. 2B is a separate illustration of a ring with spring sockets in accordance with the present invention.
FIG. 2C is a sectional view taken along the line I--I in FIG. 2B.
FIG. 2D is an illustration in part of the fixing of the ring with spri
REFERENCES:
patent: 3144283 (1964-08-01), Gamet
patent: 3648533 (1972-03-01), Parenti
patent: 3716280 (1973-02-01), Leibensperger et al.
patent: 3948577 (1976-04-01), Gamet
patent: 4227755 (1980-10-01), Lundberg
patent: 4279451 (1981-07-01), Heldt
patent: 4611935 (1986-09-01), Rode
patent: 4668109 (1987-05-01), Basso
patent: 5061089 (1991-10-01), Bair et al.
patent: 5067827 (1991-11-01), Bokel
patent: 5623345 (1997-04-01), Graft et al.
Maatta Jouni
Sivonen Matti
Hannon Thomas R.
Valmet Voimansiirto Oy
LandOfFree
Gear with bearing arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gear with bearing arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gear with bearing arrangement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-210089