The present invention provides a rolling bearing unit for supporting wheel that is able to suppress increase in the dimension in the axial direction due to the installation of a generator and a wireless communication apparatus to a minimum, supply sufficient electric power to a sensor attached to a wheel, and wirelessly transmit output signals of the sensor to an electronic apparatus on the vehicle body. The hub 17 comprises an inner recessed portion 29 on the inner diameter side of the inside portion in the axial direction which has a cylindrical fitting surface section 30 on the inner peripheral surface and is coaxial with the center axis of the hub 17, and a supporting member 67 is supported by and fastened to the inside of the inner recessed portion in a state where the hollow cylindrical supporting member 67 fits the cylindrical guide surface section 70 that is provided in the outer peripheral surface to the fitting surface section 30. A rotor 6 which is an armature is fixed to the inside portion in the axial direction of the supporting member 67 to be coaxial with the supporting member 67, and the wireless communication apparatus 12 is placed inside in the radial direction of the supporting member 67. A through-hole 34 where a wiring 57 is placed opens in the bottom surface 31 of the inner recessed portion 29.

An inner ring (10a) of a hub is fitted around a fitting tube part (11) in a state where an axially outer end of the inner ring abuts on a step surface (12), and the axially inner end surface of the inner ring is pressed by an axially outer surface of a pressing part (17) of a clamp portion (13a). Thereby, a hub body (9a) and the inner ring (10a) are fixedly coupled. The clamp portion (13a) has an engaging recess (19) that extends in a radial direction. The inner ring (10a) has an engaging protrusion (21) that is engaged with the engaging recess (19).

A bicycle hub shaft includes a first shaft section made of a first material and inserted into a sprocket seat; and a second shaft section made of a second material. The strength of the first material is stronger than that of the second material. The first shaft section has one end connected to one end of the second shaft section. The bicycle hub shaft is formed by the first and second shaft sections, instead of being integrally formed. Besides, the strength of the first shaft section is stronger than the second shaft section, so that the first shaft section inserted in the sprocket seat has a higher structural strength, thus improving the strength of the bicycle hub shaft and the load capacity of the sprocket seat as well.

A method of manufacturing a rotating bearing unit includes to cause one end surface in the axial direction of the forming punch (46), formed by combining a plurality of punch elements (46, 46) divided in the circumferential direction, which are displaceable in the axial direction and which are not displaceable in the circumferential direction, and having a processing teeth (44, 44) at one end surface in the axial direction, to face the other end surface of the caulking section (20) in the axial direction. In this state, rolls (30a) are rotated about the central axis () of the hub main body (8) while pressing the other end surface of the forming punch (46) in the axial direction with a pressing surface (43) of the roll (30a) having a central axis () that is inclined with respect to the central axis () of the hub main body (8).

A method of manufacturing a rotating bearing unit includes to cause one end surface in the axial direction of the forming punch (46), formed by combining a plurality of punch elements (46, 46) divided in the circumferential direction, which are displaceable in the axial direction and which are not displaceable in the circumferential direction, and having a processing teeth (44, 44) at one end surface in the axial direction, to face the other end surface of the caulking section (20) in the axial direction. In this state, rolls (30a) are rotated about the central axis () of the hub main body (8) while pressing the other end surface of the forming punch (46) in the axial direction with a pressing surface (43) of the roll (30a) having a central axis () that is inclined with respect to the central axis () of the hub main body (8).

A leaf spring apparatus for a vehicle suspension includes a leaf spring, a carrier disposed on an end portion of the leaf spring and mounted on a wheel of a vehicle, a first connection unit connecting the end portion of the leaf spring and the carrier to each other, a cross member disposed on top of the leaf spring and supporting a body of the vehicle, and a second connection unit connecting the leaf spring and the cross member to each other.

A leaf spring apparatus for a vehicle suspension includes a leaf spring, a carrier disposed on an end portion of the leaf spring and mounted on a wheel of a vehicle, a first connection unit connecting the end portion of the leaf spring and the carrier to each other, a cross member disposed on top of the leaf spring and supporting a body of the vehicle, and a second connection unit connecting the leaf spring and the cross member to each other.

An axle for connecting two wheels of a vehicle is provided, The axle includes a retarder configured to generate a braking force.

An axle for connecting two wheels of a vehicle is provided, The axle includes a retarder configured to generate a braking force.

An axle for connecting two wheels of a vehicle is provided, The axle includes a retarder configured to generate a braking force.