In front tube diameter at through Qian fork of Qian fork straight tube, and Qian fork straight tube its wear out front tube of top Department put reset with its bottom Xia pressure front tube and Qian fork straight tube between of car head Bowl and is located in Qian fork straight tube bottom and front tube bottom between of got off head bowl of handles straight tube, and the front Bowl within has bearing, and front tube relative Yu the front bowl of bearing at set reset axis body, and the reset axis body is through relative Yu the front bowl of bearing end margin and set of oblique to reset margin positioning bearing. Both ends of the front tube diameter relative to reset the axle body with chimeric slots SAG, while shaft is provided with corresponding to the chimeric slots projecting chimeric. Characterized, front of the bowl of the pipe relative to the head bearing set reset shaft, and each shaft is by relative to the front of the bowl of the inclined to reset the margins for the bearing edge to bearing. Through the structure, the stable positioning of the bearing, and the composition and maintenance is very convenient.

Currently front Bowl group bearing tie front tube or Qian fork tube structure, can is divided into has teeth and no teeth tie of two big class system, and regardless of for has teeth or no teeth system, its front Bowl group tie front tube of structure are can is divided into two species form, a for exposed type of structure, another a for stability hid type of structure, which, exposed type of structure due to its exposed of structure very easy for external collision and by improper of damage, so proposed hidden type of structure.

Its basic of structure are and General existing structure similar, for in a front tube 60 diameter sets set a Qian fork 70 of Qian fork straight tube 71 external, and in Qian fork straight tube 71 diameter at close tie has head straight tube 80, and its Qian fork straight tube 71 top Department another set into outside thread form, to for a bowl body 90 screw collection, and through tight pressure front Bowl group related of structure, to formed tight solid of form, and its front tube 60 diameter of top at has SAG of ring slot 61 to for Bowl body 90 capacity placed which, And in ring slot 61 bottom another has ball rail 62 to for a bearing 63 tight tie Yu course, bearing 63 diameter for its Bowl body 90 pointed-like of pressure tight structure be tight pressure positioning, and in front tube 60 bottom also relative Yu bearing 63 has mouth down of ball rail 64 to for capacity reset, and in Qian fork straight tube 71 bottom at relative has a concave arc-like of bearing seat 710 to tie hosted bearing 63, however so of structure real has following of defects 1, and Its front tube 60 must special design making front tube 60 for tie bearing 63 and Bowl body 90 of set, front tube 60 has ring slot 61, and ball rail 62, and ball rail 64, so front tube 60 must special design making, and is boring within hole of job, must precision high, thus caused making Shang of easily, scrap very high, so has improved of necessary.

　　Front Bowl group bearing distribution Shang has its inconvenience of at due to its front tube 60 within for Bowl body 90 capacity reset, that its for lock tight of Bowl body 90 deep in front tube 60 within ring slot 61 in the, tool must cannot easily reached, so, Bowl body 90 of pressure tight more difficult, relative to, to for split group Shi also produced quite of difficult.