Abstract:
This wheel support bearing assembly includes an outer member (1), an inner member (2), and a plurality of rows of rolling elements (5) between opposed rolling surfaces (3) and (4) in both members. At least one sensor unit (19) is provided on the outer diametric surface of a stationary member selected from the outer member (1) and the inner member (2). The sensor unit (19) is made up of a strain generating member (20) having two or more contact fixing segments (20a) adapted to be fixed to an outer diametric surface of the stationary member in contact therewith and a sensor (21) fitted to the strain generating member (20) for detecting a strain induced in this strain generating member (20). A groove (25) is provided in the outer diametric surface of the stationary member at a location between the neighboring two contact fixing segments (20a) of the sensor unit (19).
Abstract:
The device includes a rolling bearing unit supporting a radial load and a magnetic bearing unit supporting an axial load and/or a bearing preload; an electromagnet fitted to a spindle housing so as to confront, on a non-contact basis, a flange shaped thrust plate mounted on a main shaft; a motor rotor of a motor for driving the shaft, and a motor stator opposed to the rotor, the shaft being driven by magnetic or Lorentz forces developed between the rotor and the stator; and a sensor detecting an axial force acting on the bearing unit, and a controller controlling the electromagnet. In this device, the stiffness of a composite spring formed by the bearing unit and a support system for the bearing unit is chosen to be higher than the negative stiffness of a composite spring of a motor part comprised of the electromagnet and the motor.
Abstract:
A sensor assembly (3) is sandwiched together with a rubber material (11) mixed with a vulcanizing agent in a mold assembly (2) including an upper mold (9) and a lower mold (10). The upper and lower molds (9, 10), while completely sandwiching the sensor assembly (3), are heated for a predetermined length of time, and a pressure is then applied to the sensor assembly (3) to complete a compressive molding.
Abstract:
A sensor-incorporated wheel support bearing assembly, enabling a load sensor to be compactly installed on the vehicle and capable of detecting a load on a wheel with good sensitivity includes a ring member, affixed to a stationary member, which has at an intermediate portion thereof a first non-contact ring portion not in contact with the stationary member, at one end a first contact ring portion in contact with the stationary member, and at the other end the following (A) or (B): (A) a second non-contact ring portion having a wall thickness greater than that of the first non-contact ring portion; (B) a second contact ring portion in contact with the stationary member. A strain sensor is fitted to; in (A), the first non-contact ring portion, and in (B), the first non-contact ring portion or first contact ring portion, which has smaller wall thickness.
Abstract:
In a wheel support bearing assembly having rows of rolling elements (3) interposed between an outer member (1) and an inner member (2), spacers (27) are interposed between vehicle body fitting holes (9) in the outer member (1), which is a stationary member, and a knuckle (25). A sensor unit (16) including a sensor mounting member (17) and a strain sensor (18) is fitted to the outer member (1). The sensor mounting member (17) has at least two contact fixing portions (17a, 17b) fixed to the outer member (1) and, also, has at least one recess (17c) between the neighboring contact fixing portions (17a, 17b), the strain sensor (18) being disposed in this recess (17c).
Abstract:
A occupant weight detecting device detects the weight of an occupant setting on a vehicle seat assembly and includes a pivot support mechanism for supporting the vehicle seat assembly for pivotal movement about a horizontally extending shaft relative to a seat fixing portion in a vehicle; an elastic force applying mechanism for applying a biasing force to the vehicle seat assembly to enable the latter to pivot an angle, proportional to a load imposed on the vehicle seat assembly, relative to the seat fixing portion; a pivot angle detecting mechanism for detecting an angle of pivot of the vehicle seat assembly relative to the seat fixing portion; and a pivot restricting mechanism for defining a pivotal range over which the vehicle seat assembly can pivot relative to the seat fixing portion.
Abstract:
A blood pump apparatus comprises a housing, a centrifugal pump section including an impeller and rotating inside the housing to feed a fluid by a centrifugal force, an impeller rotational torque generation section for attracting thereto said impeller and rotating said impeller; and a plurality of grooves for hydrodynamic bearing provided on an inner surface of said housing at a side of said impeller rotational torque generation section, each of the grooves for hydrodynamic bearing having a first side and a second side both extending from a periphery of said portion in which a groove for hydrodynamic bearing is formed toward a central side thereof and opposed to each other, a third side connecting one end of said first side and one end of said second side to each other, and a fourth side connecting said other end of said first side and said other end of said second side to each other; said first side and said second side are formed as a circular arc respectively in such a way that centers of said circular arcs are different from each other.
Abstract:
A spindle device equipped with a combined externally pressurized gas-magnetic bearing assembly, and a machining apparatus utilizing the spindle device. The spindle device is capable of accomplishing a high speed rotation with high rotational precision and includes a main shaft (4) rotatably supported by the combined bearing assembly (6 to 9), an electric current detecting device (15 to 18) disposed in a spindle controller (3) for detecting a current supplied to electromagnets of the combined bearing assembly (6 to 9). Also provided is a machining status determining device (19) for determining the machining status in reference to the current detected by the current detecting device (15 to 18). The machining status may be an indication of the extent to which a machining tool is impaired.