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(11) | EP 2 093 415 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Torque transmission apparatus for transmitting driving torque from starter motor to internal combustion engine |
| (57) In a torque transmission apparatus 1, an oil seal 7 is placed at an outer periphery
of a clutch 6 in its diameter direction. The clutch 6 has an outer 6a, an inner 6b,
and a link member 6c. A lip part 7a of the oil seal 7 slides on the outer periphery
of the outer 6a fixed to a primary rotary body 3. A bearing 4 placed at the inner
periphery of the clutch 6 in the diameter direction is a ball bearing with a seal.
In particular, a filling ratio of a lubricant with which a filling space formed between
the bearing 4 and the oil seal 7 is filled is not more than 60 %. When an engine rotates,
this structure suppresses the inner pressure of the oil seal 7 from increasing and
a torque loss from increasing. The above structure decreases the fuel consumption
of the engine.
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