A dynamic pressure bearing device enabling the prevention of the deterioration of accuracy in its assembling and the lowering of strength and also enabling a reduction in cost. A guide face (2c) used as a guide when a disk hub (3) is press-fitted onto a shaft member (2) is formed on the shaft member. Then, the guide face (2c), the outer peripheral surface (2a3) of the shaft member (2) adjacent to the guide face (2c), and a boundary part between the guide face (2c) and the outer peripheral surface (2a3) are simultaneously ground to form an obtuse part (2d) with radius (r) at the boundary part. Since edges between the guide face (2c) and the outer peripheral surface (2a3) are eliminated, a press-fitting resistance produced when the disk hub is press-fitted onto the shaft end of the shaft member (2) can be reduced.

Dynamic pressure bearing device

Disclosed is a process for manufacturing a sintered slide bearing. A sintered porous bearing body is prepared from a powdered metal material and a resin material in a fluidable state is penetrated into the sintered porous bearing body. The resin material in the sintered porous bearing body is hardened, and the sintered porous bearing body after the hardening of the resin material is repressed to reduce a gap produced between the sintered porous bearing body and the hardened resin material by volume reduction caused on the resin material at the hardening.

Process for manufacturing sintered slide bearing

PROBLEM TO BE SOLVED: To provide a sintered hydrodynamic bearing manufacturing method requiring less steps for stably manufacturing a sintered hydrodynamic bearing which has reduced or closed spaces in pores without reducing its quality, and to provide the sintered hydrodynamic bearing in which lubricating oil is less absorbed SOLUTION: The sintered hydrodynamic bearing manufacturing device comprises a molding step of compression molding material powder, a sintering step of sintering a molding obtained in the molding step, and a resin impregnating step of impregnating the pores of a porous sintered body obtained in the sintering step with liquid resin and hardening the liquid resin in the pores for sealing treatment The porous sintered body has a porosity of 5-20% and contains Cu of 20 mass% or more The liquid resin is an anaerobic resin monomer containing acrylic ester or methacrylic ester as a main component and organic peroxide of 01-10 mass% COPYRIGHT: (C)2007,JPO&INPIT

Sintered hydrodynamic bearing manufacturing method

A production method for sintered bearing member comprises: compacting a metal powder into a green compact, sintering the green compact into a sintered compact; impregnating a resin solvent into the sintered compact, and removing the resin solvent adhering to a surface of the sintered compact, thereby exposing a matrix as sintered on a surface of the sintered compact. Pores existing in portions other than the surface are sealed with the resin.

Production method for sintered bearing member, fluid dynamic pressure bearing device, and spindle motor

Provided is a sintered bearing (8) having a plurality of axial grooves (8c1) equiangularly arranged in an outer peripheral surface (8c) thereof and a plurality of dynamic pressure generating grooves (8a11) equiangularly arranged in an inner peripheral surface (8a) thereof, in which a number of the plurality of axial grooves (8c1) is an integral multiple of a number of the plurality of dynamic pressure generating grooves (8a11) on the same circumference.

Sintered bearing, fluid dynamic bearing device and motor comprising same, and sintered bearing manufacturing method

PROBLEM TO BE SOLVED: To provide a low-cost bearing of high accuracy by forming the bearing of a sintered alloy, providing a bearing face opposed to the outer peripheral surface of a shaft through a clearance, and inclined dynamic pressure grooves formed on the bearing face, and levitating to support the shaft by dynamic pressure action of air in the clearance. SOLUTION: A bearing face 4 opposed to the outer peripheral surface of a shaft through a bearing clearance is formed on the inner peripheral surface of a bearing body 1 formed of a sintered alloy into porous cylindrical shape. The bearing face 4 has a first dynamic pressure generating area m1 with a plurality of dynamic pressure grooves 5 inclined in one direction in relation to an axial direction and arranged in a circumferential direction, a second dynamic pressure generating area M2 axially separated from the first area M1 and having a plurality of dynamic pressure grooves inclined in the other direction in relation to the axial direction and arranged in the circumferential direction, and an annular smooth part (n) formed between both areas M1, m2. Air is collected to the smooth part (n) by the relative rotation of the shaft and bearing body 1, and dynamic pressure at this part is heightened. Bearing rigidity is increased because of no dynamic pressure groove in the smooth part (m). The grooves 5 can be formed by compression molding so as to reduce cost, and thermal deformation is small because of the sintered alloy so as to be able to maintain high accuracy even under high temperature.

Mori Natsuhiko

Papers

Dynamic pressure air bearing