Abstract: A train position estimation device which calculates the position of a vehicle traveling on a predetermined path and comprises a surroundings shape measurement unit that is installed in the vehicle and measures the shape of the surroundings of the current location of the vehicle and a map storage unit for storing surroundings shape data at positions measured in advance, the train position estimation device being characterized by comprising a start position estimation unit for storing the probability of presence of the vehicle at each position; a map retrieval section determination device for outputting surroundings shape data for each position in descending order of presence probability; and a matching processing device that compares the surroundings shape data for the current location with the retrieved surroundings shape data and outputs the position for which the difference therebetween is equal to or less than a predetermined threshold value.

Abstract: A bus bar unit is configured to supply power to coils (16) of a plurality of phases, and includes phase bus bars (47U ), (47V), and (47W) which are provided for each phase and are connected to winding start ends of the coils, and a neutral point bus bar (81) which is connected to winding finish ends of the coils, the neutral point bus bar (81) being formed by bending an elongated plate-shaped member such that a width direction of the elongated plate-shaped member and a radial direction of the bus bar unit coincide with each other, and including a plurality of bus bar pieces (82) and a connection portion (83) which connects the bus bar pieces (82) and (82) adjacent to each other, and a width of a deformation portion (85) of the connection portion (83) being narrower than a width of the bus bar piece (82).

Abstract: A magnetic disk drive has a problem in that when a shock in excess of a force used to fasten a spindle shaft to a cover is applied, the spindle shaft becomes inclined. Embodiments of the invention overcome this problem. In one embodiment, a cover is formed with a recessed portion at a location opposite to a spindle shaft. The recessed portion is formed with a projection having an end to be in contact with an inclined portion of a tapped hole of the spindle shaft. Thus, a “plug-like” structure is formed. Preferably, a gap between the cover and the spindle shaft is not present. With this structure, even if the shock is applied from outside, the projection of the cover acts as a stopper to suppress a displacement between the spindle shaft and the cover, thus preventing inclination of the spindle shaft.

Abstract: In one embodiment, a disk drive has a solenoid and spring for turning a ramp mechanism about a rotating shaft. When the drive operates, since the ramp mechanism moves out from the magnetic disk by the force of the solenoid, the outer peripheral edge of a magnetic head that has formerly been unusable can be used as a data read/write region, without the magnetic head interfering with the fins of the ramp mechanism. During a non-operating state of the drive and in case of a power interruption, the force of the spring returns the ramp mechanism to a position at which the magnetic head can be unloaded. This construction allows the storage capacity of the drive to be easily increased without sacrificing the shock resistance of the ramp mechanism.

Abstract: The conventional ramp mechanism constituting a load/unload mechanism for a magnetic disk is disadvantageous for increasing a storage capacity since an outer peripheral edge of the disk is not used as a data area. In one embodiment of the invention, a disk drive has a solenoid and spring for turning a ramp mechanism about a rotating shaft. When the drive operates, since the ramp mechanism moves out from the magnetic disk by the tensile force of the solenoid, the outer peripheral edge of a magnetic head that has formerly been unusable can be used as a data read/write region, without the magnetic head interfering with the fins of the ramp mechanism. During a non-operating state of the drive and in case of a power interruption, the tensile force of the spring returns the ramp mechanism to a position at which the magnetic head can be unloaded. This construction allows the storage capacity of the drive to be easily increased without sacrificing the shock resistance of the ramp mechanism.

Abstract: A magnetic disk drive has a problem in that when a shock in excess of a force used to fasten a spindle shaft to a cover is applied, the spindle shaft becomes inclined. Embodiments of the invention overcome this problem. In one embodiment, a cover is formed with a recessed portion at a location opposite to a spindle shaft. The recessed portion is formed with a projection having an end to be in contact with an inclined portion of a tapped hole of the spindle shaft. Thus, a “plug-like” structure is formed. Preferably, a gap between the cover and the spindle shaft is not present. With this structure, even if the shock is applied from outside, the projection of the cover acts as a stopper to suppress a displacement between the spindle shaft and the cover, thus preventing inclination of the spindle shaft.

Abstract: Disclosed is a file memory unit having a casing for accommodating a head positioning mechanism and a magnetic recording disk virtually in sealed manner, and a frame for supporting the casing resiliently. The unit has the provision of a shock absorbing facility for absorbing the vibration created by the head positioning mechanism and the vibration and impact applied from the outside. The shock absorbing facility has a unitary structure having a first spring constant for absorbing relatively small vibration created by the casing, a second spring constant for absorbing the vibration applied from the outside, and a third spring constant for absorbing the impact applied from the outside.