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一种可减少机加工时35～40%的汽车发动机新型正时齿轮,已由Gateshead、Tyne and Wear模制件公司研制成功。这种新型齿轮的轮毂是铸钢的,外齿圈是模压的玻璃纤维增强尼龙,如图中之1。发动机厂家利用这种毛胚,只需加工键槽和齿形就可得到成品;当然,也可由该公司加工。与普通钢制齿轮相比,这种新型齿轮不仅未丧失原有的耐磨性,且传动噪音较小。另一种低噪音齿轮,是用酚醛树脂织物层作成的。图中之2,是作为汽车正时齿轮的这种齿轮,其外齿圈厚度为18毫米、由纤维方向成放射状排列的棉织物所构成。图中之3,是经切齿后的成品。这种
A new type of timing gear for automotive engines that reduces machining 35 to 40 percent has been developed by Gateshead, Tyne and Wear Molding. The hub of this new gear is cast steel and the outer ring gear is molded glass-fiber reinforced nylon, as shown in Figure 1. Engine manufacturers use this blank, simply by processing the keyway and tooth profile can be finished; of course, can also be processed by the company. Compared with ordinary steel gear, this new gear not only did not lose the original wear resistance, and transmission noise is small. Another low-noise gear, made of phenolic resin fabric. In the figure 2, this kind of gear, which is used as a timing gear of a car, has an outer ring gear of 18 mm in thickness and is composed of cotton fabrics radially arranged in the fiber direction. The figure 3, is after the finished tooth. This