Rim mounting device for tire testing device, magnet mounting method, rim replacing device and tire testing device

A method for mounting a permanent magnet in a spindle of a tire testing device, including the spindle for rotating a tire, a rim fixed to this spindle for holding the tire at the spindle side, and a permanent magnet generating a magnetic force to fix the rim to the spindle,

• the method, comprising:
• forming, in the spindle, a bottomed mounting recess, in which the permanent magnet is inserted, and a through hole extending from a bottom surface of this mounting recess towards a side of the mounting recess opposite to an opening thereof;
• inserting a guide member in the through hole, so that an end section thereof penetrates from the bottom surface of the mounting recess towards the opening side thereof;
• and
• inserting the permanent magnet inside the mounting recess while the bottom section side of the permanent magnet is supported by the end section of the guide member against a force of the bottom surface that attracts the permanent magnet due to a magnetic force of the permanent magnet.

A method for mounting a permanent magnet in a spindle of a tire testing device, including the spindle for rotating a tire, a rim fixed to this spindle for holding the tire at the spindle side, and a permanent magnet generating a magnetic force to fix the rim to the spindle,

• the method comprising:
• forming, in the spindle, a bottomed mounting recess, in which the permanent magnet is inserted;
• preparing a case body adapted to prevent direct contact between the permanent magnet and an inner circumferential surface and bottom surface of the mounting recess, and shaping an outer circumferential surface of this case body and the inner circumferential surface of the mounting recess so as to allow their thread engagement;
• and
• screwing the case body into the mounting recess to insert the case body together with the permanent magnet in the mounting recess while a bottom section side of the permanent magnet is supported by the case body against a force of the bottom surface of the mounting recess attracting the permanent magnet due to a magnetic force of the permanent magnet.

A rim replacing device provided in a tire testing device, the tire testing device including an upper rim and a lower rim capable of clamping a tire, an upper spindle for holding the upper rim, a lower spindle for holding the lower rim so that an axial center thereof becomes coaxial with an axial center of the upper rim, an upper spindle housing for rotatably supporting the upper spindle around the axial center, and an upper frame for supporting the upper spindle housing, the rim replacing device being adapted to replace the upper rim held by the upper spindle and comprising:

• a plurality of permanent magnets respectively provided in the upper spindle at a plurality of locations around an axial center thereof and generating a magnetic force for attracting the upper rim to the upper spindle;
• and
• a detaching device for detaching the upper rim, which is attracted to the upper spindle by the magnetic force of said permanent magnets, from the upper spindle;
• wherein said detaching device is fixed to the upper frame and presses the upper rim at a position radially outward remote from an outer circumferential surface of the upper spindle, in a direction to detach this upper rim from the upper spindle.