| 摘要 |
A wheel unit ( 10 ) comprises a wheel rim ( 12 ), a pneumatic tyre ( 14 ) receivable on the wheel rim ( 12 ) and a runflat assembly ( 16 ) adapted to be seated on the wheel rim ( 12 ) to close off a well ( 22 ) provided in the wheel rim ( 12 ). The runflat assembly ( 16 ) includes an annular support body ( 24 ) which is radially expandable to an expanded condition and contraction means ( 28,30 ) adapted to be operated via an opening ( 78 ) formed in the wheel rim ( 12 ). The contraction means ( 28, 30 ), when activated, is operable on the support body ( 24 ) to cause the support body ( 24 ) to be contracted to a radially contracted condition. The contraction mean is accessible through the opening ( 78 ) to cause the support body ( 24 ) to be radially contracted to seat the runflat assembly ( 16 ) on the wheel rim ( 12 ) to close off the well ( 22 ). The support body ( 24 ), when in its contracted condition, has a diameter greater than that of the wheel rim ( 12 ).
|
