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Title:
IMPROVED BICYCLE FRAME STRUCTURE
Document Type and Number:
WIPO Patent Application WO/2020/038385
Kind Code:
A1
Abstract:
An improved bicycle frame structure, comprising a frame (1), a rear fork foot (2), a front fork foot (3) and a bottom bracket (4), the rear fork foot (2) and the front fork foot (3) being respectively fixed to rear and front ends of the frame (1), and the bottom bracket (4) being located at a lower end of the middle of the frame (1). Inner bearing positions are provided in both the rear fork foot and the front fork foot, so that a rear wheel carrier bearing (6) and a front wheel bearing (5) are respectively and correspondingly fitted in the respective inner bearing positions. The front fork foot and the front wheel bearing are fixed and connected by a front wheel hub fixing pin (11) in a penetrating manner, a front wheel hub (8) is sheathed on the front wheel hub fixing pin, and there is no need to provide corresponding bearings in the front wheel hub. The rear fork foot and the rear wheel carrier bearing are fixed and connected by a rear wheel hub fixing pin (12) in a penetrating manner, a rear wheel hub (9) is sheathed on the rear wheel hub fixing pin, and there is no need to provide corresponding bearings in the rear wheel hub. Outer bearing positions are provided on both ends of a horizontal straight tube of the bottom bracket, a crankshaft bearing (7) is sheathed on each of the outer bearing positions, a crankshaft (10) is sheathed on the outside of the crankshaft bearing, and a main shaft of the crankshaft is arranged to be penetrating the horizontal straight tube of the bottom bracket and fixedly connect two crankshafts. The frame structure simplifies the structure of a hub, reduces the difficulty of manufacturing the hub, and improves the bending resistance and torsion resistance of a crankshaft.

Inventors:
YU XIAOAI (CN)
Application Number:
CN2019/101702
Publication Date:
February 27, 2020
Filing Date:
August 21, 2019
Export Citation:
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Assignee:
SHANGHAI KOSMO MACHINERY CO LTD (CN)
International Classes:
B62K19/30; B60B27/00; B62M3/00
Foreign References:
CN108749981A2018-11-06
CN208746171U2019-04-16
CN108100138A2018-06-01
CN102463844A2012-05-23
CN201049717Y2008-04-23
CN2875929Y2007-03-07
DE102004063505A12006-07-06
JPH072157A1995-01-06
Attorney, Agent or Firm:
SHANGHAI BANGDE PATENT AGENCY (CN)
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