Abstract: A fluid machine includes a thrust bearing support supporting a dynamic thrust bearing that includes a first dynamic thrust bearing and a second dynamic thrust bearing and including a first bearing base and a second bearing base fixed to each other via a spacer member. The fluid machine includes a main passage through which fluid flows from a motor chamber toward an operation chamber, and a space between an inner side of the spacer member and an outer side of the first dynamic thrust bearing and the second dynamic thrust bearing in a radial direction of a rotary shaft. The space communicates with a first through hole of the first bearing base communicating with the motor chamber and a second through hole of the second bearing base communicating with the main passage. The thrust bearing support includes a connecting passage interconnecting the space and the main passage.

Abstract: A hot forged non-heat treated steel for induction hardening, comprising by mass percent, C: 0.35 to 0.45%, Si: 0.20 to 0.60%, Mn: 0.40 to 0.80%, S: 0.040 to 0.070%, Cr: 0.10 to 0.40%, Ti: 0.020 to 0.100%, Ca: 0.0005 to 0.0050%, B: 0.0005 to 0.0030%, O: 0.0015 to 0.0050%, Mo: 0 to 0.05%, P: 0.025% or less, V: 0.03% or less, Al: 0.009% or less and N: 0.0100% or less, and the balance being Fe and impurities, with Fn1=C+(Si/10)+(Mn/5)+(5Cr/22)+1.65V?(5/7S)+1.51×(Ti?3.4N)?0.63, Ca/O?1.0, and 25.9×Fn1+27.5×(Ti?3.4N)?7.9?5.7, has more excellence in the machinability than a conventional steel and also has fatigue strength equal to or more than that of a conventional steel, while using the steel product in a hot forged state as a starting material.

Abstract: A hot forged non-heat treated steel for induction hardening, comprising by mass percent, C: 0.35 to 0.45%, Si: 0.20 to 0.60%, Mn: 0.40 to 0.80%, S: 0.040 to 0.070%, Cr: 0.10 to 0.40%, Ti: 0.020 to 0.100%, Ca: 0.0005 to 0.0050%, B: 0.0005 to 0.0030%, 0: 0.0015 to 0.0050%, Mo: 0 to 0.05%, P: 0.025% or less, V: 0.03% or less, Al: 0.009% or less and N: 0.0100% or less, and the balance being Fe and impurities, with Fn1=C+(Si/10)+(Mn/5)+(5Cr/22)+1.65V?(5/7S)+1.51×(Ti?3.4N)?0.63, Ca/O?1.0, and 25.9×Fn1+27.5×(Ti?3.4N)?7.9?5.7, has more excellence in the machinability than a conventional steel and also has fatigue strength equal to or more than that of a conventional steel, while using the steel product in a hot forged state as a starting material.