Bạc đạn (Bearings) & Bánh răng (Gear) :
Các bạc đạn bình thường ắt hẳn chư vị rành rùi
Khi bạc đạn rơ, mòn, tất phải thay cái mới.
Cái cũ có thể tận dụng làm ... bánh xe các vật dụng khác, đồ chơi con trẻ, gắn vào 2 đầu võng ...
Thầy thợ VN gọi loại dưới đây là "bạc đạn nón", hay "bạc đạn chóp" ,
= Roller Bearings
(Anh) = Roulement à rouleaux coniques
1 cặp Roller Bearings lắp đối diện nhau :Réglage du jeu =
chiều "rơ" , lỏng
Bạc đạn trục bơm nước = Water Pump Bearings.
.... vì bạc đạn dạng này luôn tiếp xúc với nước => rất nhiều kiểu dáng hình thù cấu tạo khác nhau
Do đó xin chư vị cảm phiền cứ gõ cụm từ trên => tự tìm theo nhu cầu, đa tạ
Các dạng Bánh răng (Gear)Bevel gears
Bevel gear used to lift floodgate by means of central screw.
Bevel gears are essentially conically shaped, although the actual gear does not extend all the way to the vertex (tip) of the cone that bounds it. With two bevel gears in mesh, the vertices of their two cones lie on a single point, and the shaft axes also intersect at that point. The angle between the shafts can be anything except zero or 180 degrees. Bevel gears with equal numbers of teeth and shaft axes at 90 degrees are called miter gears
The teeth of a bevel gear may be straight-cut as with spur gears, or they may be cut in a variety of other shapes. 'Spiral bevel gears'
have teeth that are both curved along their (the tooth's) length; and set at an angle, analogously to the way helical gear teeth are set at an angle compared to spur gear teeth. 'Zero bevel gears'
have teeth which are curved along their length, but not angled. Spiral bevel gears have the same advantages and disadvantages relative to their straight-cut cousins as helical gears do to spur gears. Straight bevel gears are generally used only at speeds below 5 m/s (1000 ft/min), or, for small gears, 1000 r.p.m.Rack and pinion
A rack is a toothed bar or rod that can be thought of as a sector gear with an infinitely large radius of curvature. Torque can be converted to linear force by meshing a rack with a pinion: the pinion turns; the rack moves in a straight line. Such a mechanism is used in automobiles
to convert the rotation of the steering
wheel into the left-to-right motion of the tie rod(s). Racks also feature in the theory of gear geometry, where, for instance, the tooth shape of an interchangeable set of gears may be specified for the rack (infinite radius), and the tooth shapes for gears of particular actual radii then derived from that. The rack and pinion gear type is employed in a rack railway
Sun and planet gear
Animation of sun (yellow)
and planet (red)
gearA type of non-circular gear
Harmonic Drive gear
Bánh răng Hypoid (Hypoid gears)
Hypoid gears resemble spiral bevel gears, except that the shaft axes are offset, not intersecting. The pitch surfaces appear conical but, to compensate for the offset shaft, are in fact hyperboloids of revolution.Hypoid gears are almost always designed to operate with shafts at 90 degrees. Depending on which side the shaft is offset to, relative to the angling of the teeth, contact between hypoid gear teeth may be even smoother and more gradual than with spiral bevel gear teeth. Also, the pinion can be designed with fewer teeth than a spiral bevel pinion, with the result that gear ratios of 60:1 and higher are "entirely feasible" using a single set of hypoid gears.
Bánh răng Hypoid là dạng răng xiên - xoắn => trục răng láp khớp vào bánh răng vi-sai cầu sau loại này giúp hạ thấp gầm xe : Hypoid gear in a differentialhttp://en.wikipedia.org/wiki/Gearhttp://en.wikipedia.org/wiki/Spiral_bevel_gear