A bicycle bottom bracket assembly is provided with a support member, a bearing unit and a seal member. The support member includes a hanger mounting structure and a bearing mounting structure. The bearing unit includes an outer race, an inner race and at least one roller element disposed between the
A bicycle bottom bracket assembly is provided with a support member, a bearing unit and a seal member. The support member includes a hanger mounting structure and a bearing mounting structure. The bearing unit includes an outer race, an inner race and at least one roller element disposed between the outer and inner races. The outer race is fixed to the bearing mounting structure of the support member. The seal member has a proximal end fixed to the support member and a distal end slidably contacting the inner race of the bearing unit.
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1. A bicycle bottom bracket assembly comprising: a support member including a hanger mounting structure and a bearing mounting structure;a bearing unit including an outer race, an inner race and at least one roller element disposed between the outer and inner races, the outer race being fixed to the
1. A bicycle bottom bracket assembly comprising: a support member including a hanger mounting structure and a bearing mounting structure;a bearing unit including an outer race, an inner race and at least one roller element disposed between the outer and inner races, the outer race being fixed to the bearing mounting structure of the support member; anda seal member having a proximal end fixed to the support member and a distal end slidably contacting the inner race of the bearing unit, the proximal end of the seal member being fixed to the support member at a location axially inward from the bearing unit with respect to a rotational center axis of the bearing unit. 2. The bicycle bottom bracket assembly according to claim 1, wherein the distal end of the seal member is in sliding contact with an axially inner facing surface of the inner race of the bearing unit. 3. A bicycle bottom bracket assembly comprising: a first support member including a hanger mounting structure and a bearing mounting structure;a first bearing unit including an outer race, an inner race and at least one roller element disposed between the outer and inner races, the outer race being fixed to the bearing mounting structure of the first support member; anda first axially inner seal member having a proximal end fixed to the first support member at a location axially inward from the first bearing unit with respect to a rotational center axis of the first bearing unit and a distal end slidably contacting the inner race of the first bearing unit; anda first axially outer seal member having a proximal end fixed to the first support member at a location axially outward from the first bearing unit with respect to the rotational center axis of the first bearing unit and a distal end slidably contacting the inner race of the first bearing unit. 4. The bicycle bottom bracket assembly according to claim 3, wherein the distal end of the first axially inner seal member is in sliding contact with an axially facing surface of the inner race of the first bearing unit. 5. The bicycle bottom bracket assembly according to claim 3, wherein the distal end of the first axially outer seal member contacts an axially extended portion of the inner race of the first bearing unit. 6. The bicycle bottom bracket assembly according to claim 5, wherein the axially extended portion of the inner race of the bearing unit includes a polished surface, and the distal end of the first axially outer seal member contacts the polished surface. 7. The bicycle bottom bracket assembly according to claim 3, further comprising a first seal guard supporting the inner race of the first bearing unit; anda first auxiliary cover disposed between the first support member and the first seal guard,the first seal guard and the first auxiliary cover being arranged to form a labyrinth structure that is positioned at a location axially outward from the first axially outer seal member with respect to the rotational center axis of the first bearing unit. 8. The bicycle bottom bracket assembly according to claim 3, wherein the first bearing unit is press-fitted into the bearing mounting structure of the first support member. 9. The bicycle bottom bracket assembly according to claim 3, wherein the hanger mounting structure of the first support member has a threaded outer circumferential surface that is configured and arranged to be threaded into a first open end of a hanger part of a bicycle frame. 10. The bicycle bottom bracket assembly according to claim 3, wherein the first support member has a first connecting tube mounting part that extends axially inward from the hanger mounting structure of the first support member. 11. The bicycle bottom bracket assembly according to claim 10, further comprising a connecting tube member that is fitted to the first correcting mounting part of the first support member. 12. The bicycle bottom bracket assembly according to claim 11, further comprising an O-ring member disposed between one end of the connecting tube member and the first connecting tube mounting part of the first support member. 13. The bicycle bottom bracket assembly according to claim 11, wherein the connecting tube member is fitted inside an inner circumferential surface of the first connecting tube mounting part of the first support member. 14. The bicycle bottom bracket assembly according to claim 11, wherein the connecting tube member is fitted over an outer circumferential surface of the first connecting tube mounting part of the first support member. 15. The bicycle bottom bracket assembly according to claim 3, further comprising a second support member including a hanger mounting structure and a bearing mounting structure;a second bearing unit including an outer race, an inner race and at least one roller element disposed between the outer and inner races of the second bearing unit, the outer race of the second bearing unit being fixed to the bearing mounting structure of the second support member; anda second axially inner seal member having a proximal end fixed to the second support member at a location axially inward from the second bearing unit with respect to a rotational center axis of the second bearing unit and a distal end slidably contacting the inner race of the second bearing unit. 16. The bicycle bottom bracket assembly according to claim 15, wherein the distal end of the first axially inner seal member is in sliding contact with air axially facing surface of the inner race of the first bearing unit, andthe distal end of the second axially inner seal member is in sliding contact with an axially facing surface of the inner race of the second bearing unit. 17. The bicycle bottom bracket assembly according to claim 15, further comprising a first axially outer seal member having a proximal end fixed to the first support member at a location axially outward from the first bearing unit with respect to the rotational center axis of the first bearing unit and a distal end slidably contacting the inner race of the first bearing unit, anda second axially outer seal member having a proximal end fixed to the second support member at a location axially outward from the second bearing unit with respect to the rotational center axis of the second bearing unit and a distal end slidably contacting the inner race of the second bearing unit. 18. The bicycle bottom bracket assembly according to claim 17, wherein the distal end of the first axially outer seal member contacts an axially extended portion of the inner race of the first bearing unit, andthe distal end of the second axially outer seal member contacts an axially extended portion of the inner race of the second bearing unit. 19. The bicycle bottom bracket assembly according to claim 18, wherein the axially extended portion of the inner race of the first bearing unit includes a first polished surface, and the distal end of the first axially outer seal member contacts the first polished surface,the axially extended portion of the inner race of the second bearing unit includes second polished surface, and the distal end of the second axially outer seal member contacts the second polished surface. 20. The bicycle bottom bracket assembly according to claim 17, further comprising a first seal guard supporting the inner race of the first bearing unit;a first auxiliary cover disposed between the first support member and the first seal guard, the first seal guard and the first auxiliary cover being arranged to form a first labyrinth structure that is positioned at a location axially outward from the first axially outer seal member with respect to the rotational center axis of the first bearing unit;a second seal guard supporting the inner race of the second bearing unit; anda second auxiliary cover disposed between the second support member and the second seal guard, the second seal guard and the second auxiliary cover being arranged to form a second labyrinth structure that is positioned at a location axially outward from the second axially outer seal member with respect to the rotational center axis of the second bearing unit. 21. The bicycle bottom bracket assembly according to claim 15, wherein the first support member has a first connecting tube mounting part that extends axially inward from the hanger mounting structure of the first support member, andthe second support member has a second connecting tube mounting part that extends axially inward from the hanger mounting structure of the second support member. 22. The bicycle bottom bracket assembly according to claim 21, further comprising a connecting tube member extending between the first connecting tube mounting part of the first support member and the second connecting tube mounting part of the second support member. 23. The bicycle bottom bracket assembly according to claim 22, further comprising a first O-ring member disposed between one end of the connecting tube member and the first connecting tube mounting part of the first support member, anda second O-ring member disposed between the other end of the connecting tube member and the second connecting tube mounting part of the second support member.
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