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On Design ■Operating motion and PV value ■Environmental temperature and PV value PV value listed in this catalogue is allowable PV value for radial journal rotational operation. Depending on the operation motion, allowable PV value should be designed with more leeway based on the standard below. Service temperature range listed in the catalogue indicates heat resistance derived from the material and the structure of the bearings. Depending on the environmental temperature, it is necessary to design the bearing based on below conditions. When a bearing is used in high temperature: ●PV value should be set at low level as decline of the frictional characteristics and difficulty in frictional heat diffusion may be anticipated. ●Decline in the hardness of the bearing material should be taken into account. ●Clearance decrease caused by the dimensional change of the bearing and the mating shaft due to heat expansion should be considered. ●In order to prevent sliding at the outer diameter and falling off of the bearing, lock screw or detent screw should be implemented taking press fitting interference decrease caused by stress relaxation of the bearing into account. When a bearing is used in low temperature: ●Study impact strength and brittleness of the bearing material in low temperature ●Study clearance decrease caused by the heat shrinkage of the inner diameter of the bearing. ●Study decline of the fixed force which is brought about by the decrease in the interference with the housing. Compared to the metallic bearing, plastic bearing (especially thermoplastic resin material) has the lower melting point and therefore, is prone to heat effect. As heat expansion coefficient is big, attention should be paid in fitting design such as stress relaxation, decrease in clearance due to temperature change and others. Selection and Design of Oiles Bearings Bushing Plate Washer 0 0.2 0.4 0.6 0.8 1.0 Reciprocation 1 : stroke/bearing length<2 Reciprocation 2 : stroke/bearing length>2 Shaft rotation Bearing rotation Shaft oscillation Bearing oscillation Reciprocation 1 Reciprocation 2 Minute oscillation 0 0.2 0.4 0.6 0.8 1.0 Reciprocation 1 Reciprocation 2 Minute oscillation 0 0.2 0.4 0.6 0.8 1.0 Shaft rotation Bearing rotation Shaft oscillation Bearing oscillation Minute oscillation Reciprocation 1 : stroke/bearing length<2 Reciprocation 2 : stroke/bearing length>2 ※Values in the chart are to be used only as a guide when allowable PV value of bushing at shaft rotational motion is 1. Mode of motion Coefficient of load Mode of motion Coefficient of load Mode of motion Coefficient of load Room temp. Allowable max. temp. Allowable PV value 337Selection Guide Product Air Bearings Metallic Bearing Multi-layer Bearing Plastic Bearing Information Technical Corporate Profi le Information Slide Shifter