| 摘要 |
PURPOSE: A seal structure is provided to reduce the axial length of a device by accepting a peripheral member of oil seal in the axial direction although two or more oil seals are arranged. CONSTITUTION: A seal structure comprises a main speed reducer casing(30), first and second oil seals(50,52), a pre-speed reducer casing(27), and an inner pin member. The outer circumference of a cylinder part(30A) of the main speed reducer casing is contacted with an external space. The first and the second oil seals are arranged in the inner circumference of the cylinder part of the casing. The pre-speed reducer casing is contacted with the inner circumference of the first oil seal. The inner pin member is contacted with the inner circumference of the second oil seal. The inner pin member is contacted with the pre-speed reducer casing. A part of the inner pin member is contacted with the internal space of the main speed reducer. The external space and the internal space are sealed by the first and the second oil seals.
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