CN2034213U - Radical-thrust hollow cylindrical roller bearing - Google Patents

Abstract

The utility model is discloses a radical-thrust hollow cylindrical roller bearing, which is a radial-thrust bearing used an outer ring, (or an inner ring) a splicing retainer ring, and a retaining edge with angle of a movable retainer ring (angle=0 DEG-3 DEG) to bear the axial force. The utility model has the advantages of compact structure, simple installation, and economy. The additional axial load or the radial load of a shaft caused by heating expansion to the bearing can not be generated.

Description

Radical-thrust hollow cylindrical roller bearing

The utility model relates to a kind of roller bearing that is used for rotation motion machinery.

Existing hollow roller bearing can only bear radial load.Must cooperate during use and bear axial force with thrust bearing.The axial force of being born is very little on the axle of some lathes, precision optical machinery and high speed rotary machinery, the ratio less than 15% of its thrust load and radial load.Therefore, the purpose of this utility model is to provide a kind of novel hollow cylindrical roller bearing---thrust hollow cylindrical roller bearing radially, so that shaft support can bear radial and axial load simultaneously.

All there is the solid cylinder roller bearing of rib inner ring, outer ring, can allow to bear the thrust load of a small amount of interruption.Abroad this type of bearing structure is improved in order to increase the ability that this class bearing bears thrust load, be about to the straight rib of bearing and the roller of straight end face and change the rib of band angle and the cylindrical roller of dribbling end face into; And the cylindrical roller of the rib of band angle and straight end face.This variation is seen in the earliest in U. S. Patent NO in 1964, and 3,268,279 these improved purposes are to change the roller end face of bearing and the simple sliding friction state between the lasso rib, makes it to form between this friction pair the very thin lubricant film that can carry of one deck.

Hollow cylindrical roller bearing as the full dress roller of preload will have better bearing capacity than solid roller bearing when all being with rib on Internal and external cycle, this be because:

1, this bearing does not have retainer and completely adorns roller, and therefore the roller quantity on each row raceway is more than the solid cylinder roller bearing, so the average axial force between roller end face and the bearing edge guard is just little.

2, the roller of hollow cylindrical roller bearing receives all the time and preloads, therefore each roller can both transmit axial force, and in solid, roller bearing only the roller at loading zone bear axial force, then play is arranged in the non-bearing district because of bearing, roller tilts not bear axial force, (see figure 1).

The supporting region of general solid roller bearing is slightly larger than 90 °, promptly only has the roller about 1/4 can bear axial force.

In sum, the roller quantity of radially transmitting thrust load in the thrust hollow cylindrical roller bearing manys 4-5 doubly than unidimensional solid cylinder roller bearing, and the distribution of power is more reasonable, easier formation oil film between roller end face and lasso rib.

The utility model is in known radially preload, completely adorns on the hollow cylindrical roller bearing basis of roller, no retainer, has increased rib at bearing inner race or outer ring, utilizes the rib of roller end face and bearing enclose to transmit axial force, makes axially locating.For making the lubricant film that formation can be carried between roller end face and rib, make its contact area be in good lubricating status, and adopted the angle rib to contact with the hollow roller of straight end face.Make lubricant oil be easy to enter the contact area, make the contact area be positioned as close to raceway on the other hand so on the one hand,, reduced frictional force to obtain higher axial carrying capacity and best end-face friction state.

For the two-way bearing that bears axial force, two lassos (inside and outside circle) all must be made for two rib forms.For hollow roller is installed, wherein must there be a rib to make the splicing form.Bear axial force person for unidirectional, can splice the rib form.Inner ring, outer ring and movable all ribs that contact with roller such as splicing back-up ring have 0 °～3 ° angle.

In order to eliminate the axial clearance of bearing, adopted the splicing back-up ring 4 of the activity of band spring 9 to add thrust load in advance.Raceway 6 or interior raceway 7 are guiding beyond the movable splicing back-up ring 4, generally adopt the outer ring raceway guiding when the axle rotation; When not changeing, adopt on axle inner ring raceway to guide.Spring 9 on the movable splicing back-up ring 4 leans against on the box body hole step or on the flange plate 11, promotes the activity splicing back-up ring 4 of band angle, and roller 3 is pressed on another rib, has so just realized adding in advance thrust load, has eliminated axial clearance.Pin (or key) 8 on the movable splicing back-up ring 4 is used for anti-rotation and location.

Compared with the prior art the utility model has:

1, compare with hollow cylindrical roller bearing radially, bearing radial force and axial force have simultaneously been saved thrust or thrust ball bearing radially, simplify the structure, and make design more economical.

2, with existing tapered roller bearing, radially thrust ball bearing is compared, except having radially characteristics such as highi degree of accuracy, high rigidity, high limit rotating speed, they do not need to do axially to adjust accurately, simplified installation as conical bearing, radial-thrust bearing, simultaneously after roller end face and rib break-in, do not influence bearing radial interference amount, need not readjust axial position yet.During this external expanded by heating, can not produce additional axial force and radial force to bearing.

Be described as follows with regard to drawings and Examples of the present utility model below:

Fig. 1 for general solid cylinder roller bearing after being subjected to axial force Pa, because of there is play in bearing roller is tilted, can not bear the situation of thrust load.

Fig. 2 is embodiment one of the present utility model, by the two ribs of inner ring 2 band angles, the unidirectional radially thrust hollow cylindrical roller bearing of outer ring 1 for being with angle single block border, the single-row hollow cylindrical roller 3 of planar end surface to form.

Fig. 6 is embodiment two, and it is by the two ribs of interior astragal angle, and the outer ring is the single block border of band angle and the two-way radially thrust hollow cylindrical roller bearing of being made up of splicing back-up ring 4 and the single-row hollow cylindrical roller of planar end surface.

Fig. 7 is embodiment three, by interior astragal angle single block border, and the unidirectional radially thrust hollow cylindrical roller bearing that two ribs of outer astragal angle and planar end surface hollow cylindrical roller are formed.

Fig. 8 is embodiment four, reaches the two-way radially thrust hollow cylindrical roller bearing that the splicing rib of being made up of movable back-up ring, the two ribs of outer astragal and planar end surface hollow cylindrical roller are formed by interior astragal single block border.

Figure 10 is embodiment five, by interior astragal centre rib, outer astragal single block border, guides radially thrust hollow cylindrical roller bearing of biserial that the movable rib of preload, planar end surface hollow cylindrical roller form outward.

Figure 11 is embodiment six, the single-row two-way thrust hollow cylindrical roller bearing of being made up of the movable back-up ring of the preload of interior astragal single block border and inner ring guiding, the two ribs of outer astragal and planar end surface hollow cylindrical roller.

Fig. 3,4,5 and 9 is each and the enlarged view of roller planar end surface contacting point rib (containing movable splicing rib) 5 in the foregoing description, and embodiment's best angle 12 is 1.5 ° among the figure.

Claims (4)

1, radial-thrust bearing by outer ring, inner ring, and hollow cylindrical roller form, when it is characterized in that the two rib of outer ring 1 (or inner ring 2) band, inner ring 2 (or outer ring 1) is the form of the splicing back-up ring 4 of single block border and activity, and roller 3 is the hollow cylindrical roller of single-row or biserial.

2, bearing according to claim 1, it is characterized in that the outer ring 1, inner ring 2 of bearing, movable splicing back-up ring 4 etc. all with rib 5 that roller 3 contacts on have angle 12, its value is 0 °～3 °.

3, bearing according to claim 1 and 2 is characterized in that the splicing back-up ring 4 of activity is made up of back-up ring body 13, spring 9 and 8 of stop pins (or key), and two kinds of forms that raceway 7 guided in raceway 6 guiding reached beyond having.

4, bearing according to claim 1 is characterized in that: the biserial radially lasso of thrust hollow cylindrical roller bearing (inner ring and outer ring) can all be made the form of being with rib, and inner ring (or outer ring) can not omitted by axial force place rib.

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