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1. EP1134423 - A blower

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Claims

1. A blower having an impeller (10) adapted to be rotated upon energizing the blower comprising;
a bearing apparatus for supporting a rotational centre portion of the impeller (10), the bearing apparatus including;
a sleeve (6),
a stepped shaft (7) including a larger diameter portion (7a) and a reduced diameter portion (7b) provided at one end thereof,
a first rolling contact groove (17a) formed at an appropriate position around the outer peripheral surface of the larger diameter portion (7a),
a second rolling contact groove (17b) formed on an inner peripheral surface of the sleeve (6) so as to correspond with the first rolling contact groove (17a),
balls (18a) of a first row interposed between the first and second grooves (17a, 17b),
an inner race (19) fitted over the reduced diameter portion (17b) and secured thereto with an appropriate preloading force,
a third rolling contact groove (20a) formed around an outer peripheral surface of the inner race (19),
a fourth rolling contact groove (20b) formed on the inner peripheral surface of the sleeve (6) so as to correspond with the third rolling contact groove (20a), and
balls (18b) of a second row interposed between the third and fourth grooves (20a, 20b).
  2. A blower comprising:

a frame (1) including a base (3) connected through stays (2) to the frame (1) so as to be positioned at the central portion of the frame (1),

a cylindrical bearing member (4) formed integrally with the base (3) to extend therefrom forwardly,

a stator (5) including an iron core (5a) and a coil (5b) and mounted on the exterior of the cylindrical bearing member (4),

an impeller (10) including a front face plate (10a), a flange (10b) formed over the outer periphery of the front face plate (10a), and suitable numbers of blades (11) provided on the outer periphery of the flange (10b),

a yoke (8) including a front face plate (8a) to which the front face plate (10a) of the impeller (10) is secured, a flange (8b) formed over the outer periphery of its front face plate (8a), magnet or magnets (9) mounted on its flange (8b), and

a bearing apparatus for supporting a central portion (8c) of the yoke (8) through a shaft (7) or sleeve (6) of the bearing apparatus to which the central portion (8c) of the yoke (8) is fitted and secured, the bearing apparatus including:

a sleeve (6),

a stepped shaft (7) including a larger diameter portion (7a) and a reduced diameter portion (7b) provided at one end thereof,

a first rolling contact groove (17a) formed at an appropriate position around the outer peripheral surface of the larger diameter portion (7a),

a second rolling contact groove (17b) formed on an inner peripheral surface of the sleeve (6) so as to correspond with the first rolling contact groove (17a),

balls (18a) of a first row interposed between the first and second grooves (17a, 17b),

an inner race (19) fitted over the reduced diameter portion (7b) and secured thereto with an appropriate preloading force,

a third rolling contact groove (20a) formed around an outer peripheral surface of the inner race (19),

a fourth rolling contact groove (20b) formed on the inner peripheral surface of the sleeve (6) so as to correspond with the third rolling contact groove (20a), and

balls (18b) of a second row interposed between the third and fourth grooves (20a, 20b).


  3. A blower according to claim 2 wherein the bearing apparatus is for supporting the central portion (8c) of the yoke (8) through the shaft (7) of the bearing apparatus to which the central portion (8c) of the yoke (8) is fitted and secured.
  4. A blower according to claim 2 wherein the bearing apparatus is for supporting the central portion (8c) of the yoke (8) through the sleeve (6) of the bearing apparatus to which the central portion (8c) of the yoke (8) is fitted and secured.
  5. A blower according to claim 4 wherein the bearing apparatus is provided within the cylindrical bearing member (4) so that the sleeve (6) can be rotated around the axis of the bearing apparatus, and the end of the shaft (7) is secured to the base (3).
  6. A blower comprising:

a frame (1) including a base (3) connected through stays (2) to the frame (1) so as to be positioned at the central portion of the frame (1),

a stator (5) including an iron core (5a) and a coil (5b) and mounted on the inner peripheral surface of a flange (3a) extending forwardly from an outer periphery of the base (3),

an impeller (10) including a front face plate (10a), a flange (10b) formed over the outer periphery of the front face plate (10a), and suitable numbers of blades (11) provided on the outer periphery of the flange (10b) thereof,

a bearing apparatus for supporting a central portion of a supporting plate (23) mounted on the rear surface of the front face plate (10a), the bearing apparatus including,

a sleeve (6) to which the central portion of the supporting plate (23) is fitted and secured,

a stepped shaft (7) including a larger diameter portion (7a) and a reduced diameter portion (7b) provided at one end thereof,

a first rolling contact groove (17a) formed at an appropriate position around the outer peripheral surface of the larger diameter portion (7a),

a second rolling contact groove (17b) formed on an inner peripheral surface of the sleeve (6) so as to correspond with the first rolling contact groove (17a),

balls (18a) of a first row interposed between the first and second grooves (17a, 17b),

an inner race (19) fitted over the reduced diameter portion (7b) and secured thereto with an appropriate preloading force,

a third rolling contact groove (20a) formed around an outer peripheral surface of the inner race (19),

a fourth rolling contact groove (20b) formed on the inner peripheral surface of the sleeve (6) so as to correspond with the third rolling contact groove (20a), and

balls (18b) of a second row interposed between the third and fourth grooves (20a, 20b), wherein

the exterior of the sleeve (6) of the bearing apparatus is provided with a cylindrical yoke (8) on which a magnet or magnets (9) corresponding to the coil (5b) of the stator (5) is provided, and the end of the shaft (7) is secured to the base (3).


  7. A blower according to any one of claims 1 to 6 wherein the balls (18a, 18b) are made of ceramic material.
  8. A blower according to any one of claims 1 to 7 wherein the outer diameter of the inner race (19) is the same as that of the larger diameter portion (7a) of the shaft (7), and the diameter of the balls (18a) of the first row is the same as that of the balls (18b) of the second row.