JP2017020581A5

JP2017020581A5 -

Info

Publication number: JP2017020581A5
Application number: JP2015138786A
Authority: JP
Filing date: 2015-07-10
Publication date: 2018-05-31

Description

尚、前記内輪軌道１７の溝半径Ｒ_１７を、前記各玉１９、１９の直径Ｄ_１９の０．５０５倍よりも小さくする（Ｒ_１７＜０．５０５Ｄ_１９）と、前記内輪軌道１７とこれら各玉１９、１９の転動面との接触面積が過度に大きくなって、前記玉軸受１の運転時の動トルクが増大すると共に、前記角隙間θを０．３度以上、１．０度以下の範囲に設定する事が難しくなる。一方、前記内輪軌道１７の溝半径Ｒ_１７を、前記各玉１９、１９の直径Ｄ_１９の０．５２倍よりも大きくする（Ｒ_１７＞０．５２Ｄ_１９）と、これら各玉１９、１９の転動面との接触面積が過度に小さくなり、これら各玉１９、１９の転動面との接触面圧が徒に大きくなる可能性がある。この結果、これら各玉１９、１９の転動面との接触面圧が前記外輪軌道１５よりも大きく成り易い、前記内輪軌道１７の転がり疲れ寿命を確保し難くなる可能性がある。
又、前記角隙間θを、０．３度よりも小さくする（θ＜０．３度）と、前記外輪１６と前記内輪１８との間に作用するアキシアル荷重が大きくなった場合に、前記外輪軌道１５及び前記内輪軌道１７と、前記各玉１９、１９の転動面との接触面圧が過度に増大して、前記玉軸受１の転がり疲れ寿命の確保が難しくなる可能性がある。一方、前記角隙間θを、１．０度よりも大きくする（θ＞１．０度）と、前記外輪１６と前記内輪１８とのがたつきが徒に大きくなる可能性がある。 If the groove radius R ₁₇ of the inner ring raceway 17 is made smaller than 0.505 times the diameter D ₁₉ of the balls 19, ₁₉ (R ₁₇ <0.505 D ₁₉ ), the inner ring raceway 17 and each of these The contact area of the balls 19 and 19 with the rolling surface becomes excessively large, the dynamic torque during operation of the ball bearing 1 increases, and the angular gap θ is 0.3 degrees or more and 1.0 degrees or less. It becomes difficult to set the range. On the other hand, when the groove radius R ₁₇ of the inner ring raceway 17 is made larger than 0.52 times the diameter D ₁₉ of each ball 19, ₁₉ (R ₁₇ > 0.52D ₁₉ ), There is a possibility that the contact area with the rolling surface becomes excessively small, and the contact surface pressure with the rolling surface of each of the balls 19, 19 may increase spontaneously. As a result, the contact surface pressure of the balls 19, 19 with the rolling contact surface is likely to be larger than that of the outer ring raceway 15 , and it may be difficult to ensure the rolling fatigue life of the inner ring raceway 17.
Further, when the angular gap θ is smaller than 0.3 degrees (θ <0.3 degrees), the axial load acting between the outer ring 16 and the inner ring 18 becomes larger. Contact surface pressure between the raceway 15 and the inner ring raceway 17 and the rolling surfaces of the balls 19 and 19 may increase excessively, making it difficult to ensure the rolling fatigue life of the ball bearing 1. On the other hand, if the angular gap θ is larger than 1.0 degree (θ> 1.0 degree), the rattling between the outer ring 16 and the inner ring 18 may become large.