Abstract: An assembled battery is formed by combining battery modules. Each battery module includes at least one battery cell and a rectangular box-shaped case that accommodates the at least one battery cell. The battery modules include a first battery module and a second battery module located adjacent to each other. The case of each of the first battery module and the second battery module includes an opposing side surface that is opposed to one of the first battery module and the second battery module. Each opposing side surface includes projections, which are laid out in rows, and ribs, which extend parallel to the layout direction of the projections. The ribs are smaller in height than the first projections. The ribs include connection ribs that connect the projections located in a predetermined range in the layout direction of the projections.

Abstract: An assembled battery is formed by combining battery modules. Each battery module includes at least one battery cell and a rectangular box-shaped case that accommodates the at least one battery cell. The battery modules include a first battery module and a second battery module located adjacent to each other. The case of each of the first battery module and the second battery module includes an opposing side surface that is opposed to one of the first battery module and the second battery module. Each opposing side surface includes projections, which are laid out in rows, and ribs, which extend parallel to the layout direction of the projections. The ribs are smaller in height than the first projections. The ribs include connection ribs that connect the projections located in a predetermined range in the layout direction of the projections.

Abstract: A sleeve housing for a motor includes a bearing member, which includes a cylindrical portion and a collar portion and is formed by press working or by forging. The bearing member is retained by a retaining portion which is a portion of a cutting tool and which relatively rotates with respect to the cutting tool in a concentric manner with a predetermined rotation axis in order to execute a cutting process on a lower portion of the collar portion with reference to an upper portion thereof, so as to effectively form the sleeve housing with very high precision.

Abstract: A sleeve housing for a motor includes a bearing member, which includes a cylindrical portion and a collar portion and is formed by press working or by forging. The bearing member is retained by a retaining portion which is a portion of a cutting tool and which relatively rotates with respect to the cutting tool in a concentric manner with a predetermined rotation axis in order to execute a cutting process on a lower portion of the collar portion with reference to an upper portion thereof, so as to effectively form the sleeve housing with very high precision.

Abstract: A fluid dynamic bearing includes a sleeve, a shaft arranged inside the sleeve with a gap interposed therebetween, and a hollow cylindrical bearing housing having a closed end and an open end. The bearing housing is arranged outside the sleeve and has a flange having a thrust bearing surface. A plurality of dynamic pressure generating grooves are formed on the thrust bearing surface. A flat region surrounding the dynamic pressure generating grooves is formed on the thrust bearing surface at and along an outer peripheral edge of the thrust bearing surface.

Abstract: A method for assembling a bearing structure is provided. The bearing structure includes a housing of a cylindrical shape with one closed end, made up of a cylindrical portion and a cap portion. The method includes the steps of inserting a shaft integrated with a rotor hub into a sleeve and fixing a stopper member to the distal end of the shaft so as to make a hub assembly, inserting the sleeve into the housing, exerting a force on the sleeve to move toward the bottom of the housing until an end surface of the sleeve abuts the stopper member, pulling one of the housing and the hub assembly from the other relatively in the axial direction by a predetermined distance, and fixing the sleeve to the housing.