CN2167871Y - Caster wheel - Google Patents

Abstract

The utility model relates to a caster wheel installed at the bottoms of furniture and appliances for moving conveniently. The utility model comprises an upper cover 1, a thrust ball bearing 2, a special form thrust ball bearing 3, a roller seat 4, rollers 5. The utility model is characterized in that the special form thrust ball bearing is used on positions where the moments of the acting force of rollers to stress points are less than or equal to zero to improve the stress situation of the thrust ball bearing in order to improve the bearing capacity of the caster wheel. The utility model has the advantages of strong bearing capacity, little possibility of damage, flexible turn, etc., and the utility model is especially suitable for furniture and appliances with large weight.

Description

Caster wheel

The relevant a kind of castor of the utility model.

At present, known castor has following structure: roller shaft and steering shaft are vertical mutually and certain distance arranged, thrust ball bearing is housed with bearing load and realize divertical motion on the steering shaft, the shortcoming of this structure is: when the castor bearing load, the roller application force makes thrust ball bearing compacted near an end of roller, and is the first transaction of a day's business trend away from an end of roller, load is big more, the stress point of bearing is concentrated more, because the shaft strength inequality, so be easy to damage; Also limit simultaneously the weight capacity of castor, influenced the steering flexibility of castor.

It is strong that the utility model aims to provide a kind of weight capacity, not fragile, turns to castor flexibly.

The utility model caster wheel is achieved in that it has loam cake 1, thrust ball bearing 2, turning rolls 4, roller 5, it is characterized in that special-shaped thrust ball bearing 3 is housed between loam cake and turning rolls, and this bearing has at least a stress point to be on the position of roller application force to square≤0 of stress point.

Above-mentioned castor can be that the path of motion of the rolling body of special-shaped thrust ball bearing is non-circular and not in same plane.

Above-mentioned castor can be the rolling body of special-shaped thrust ball bearing when stressed and the rolling body of thrust ball bearing at grade.

Above-mentioned castor can be rolling body measure-alike of the size of rolling body of special-shaped thrust ball bearing and thrust ball bearing.

The utility model uses on to the position of square≤0 of stress point special-shaped thrust ball bearing to increase the rolling stress point, to improve the force-bearing situation of thrust ball bearing at the roller application force, thereby improve the weight capacity of castor, compare with known castor, it is strong that it has weight capacity, not fragile, turn to advantage flexibly.

The cutaway view of the A-A of Fig. 1: Fig. 2.

The birds-eye view of Fig. 2: Fig. 1.

Fig. 3: the low concave portion that is expressed in the special-shaped thrust ball bearing raceway of making on the plane on the turning rolls.

The B-B cutaway view of Fig. 4: Fig. 3.

The left view of Fig. 5: Fig. 1.

Fig. 6: the stressed scheme drawing of known castor.

Fig. 7: the stressed scheme drawing of the embodiment that the utility model provides.

Fig. 8: the utility model is at the stressed scheme drawing of roller application force to square＜0 of stress point o'clock.

Accompanying drawing Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 have provided an embodiment of the present utility model, are described further with reference to the accompanying drawings: the steering shaft in the middle of the loam cake is packed in the hole at turning rolls rear portion, and tolerance clearance is not more than 0.05 millimeter.Screw 6 is tightened on the steering shaft, and its head blocks turning rolls does not make it come off, and between the plane is being thrust ball bearing and special-shaped thrust ball bearing on the lower plane of loam cake and the turning rolls.Thrust ball bearing is to constitute around by the circular hole on the retainer 7 rolling body being trapped among steering shaft.Special-shaped thrust ball bearing is the distortion of thrust ball bearing, and its raceway is non-circular, by retainer be engraved in that the low concave portion on the plane constitutes jointly on the turning rolls.Its principle of work is such: rolling body rolls at friction force effect lower edge raceway, enters low concave portion when rolling across straight line 8, and is no longer stressed, enters stressed position from the raceway other end under the promotion of back rolling body.Pin 9 is fixed on retainer on the turning rolls.Special-shaped thrust ball bearing can be defined as: plane, path of motion place was perpendicular when loading direction and rolling body were stressed, the path of motion of rolling body is non-circular and the thrust ball bearing in same plane not, the above is the roller application force to the embodiment of square=0 of stress point o'clock, can see having a rolling body to be on the position of roller line of action of force from Fig. 1, Fig. 2.

The residing position of special-shaped thrust ball bearing determines according to the size of load, and its stress point should be crossed the roller line of action of force when bearing big load, makes square＜0 of roller application force to stress point.

Fig. 6, Fig. 7, Fig. 8 are respectively the stressed scheme drawings of known castor and two embodiment of the present utility model, for the contrast reference.

Claims (4)

1, a kind of furniture, utensil bottom of being installed in is so that its novel castor that moves, it has loam cake 1, thrust ball bearing 2, turning rolls 4, roller 5, it is characterized in that special-shaped thrust ball bearing 3 is housed between loam cake and turning rolls, and this bearing has at least a stress point to be on the position of roller application force to square≤0 of stress point.

2, according to claim 1 caster wheel, the path of motion that it is characterized in that said special-shaped its rolling body of thrust ball bearing is non-circular and not in same plane.

3, according to claim 2 caster wheel, it is characterized in that said its rolling body of special-shaped thrust ball bearing when stressed and the rolling body of thrust ball bearing at grade.

4,, it is characterized in that the measure-alike of the size of said special-shaped its rolling body of thrust ball bearing and thrust ball bearing rolling body according to claim 3 caster wheel.

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