高压燃油泵
发动机发电机
转速表
通风口
24．所有齿轮的啮合都设计为“不规则”的齿轮传动比，以保证齿轮上的每一个齿在每转一圈时不与它对应的齿再度啮合。这样可以将磨损均匀地分布到所有的齿上。
离心式
通风机
飞机发电机
径向传动轴
25. Spiral bevel gears are used for the connection of shafts whose axes are at an angle to one another but in the same plane. The majority of gears within a gear train are of the straight spur gear type, those with the widest face carry the greatest loads. For smoother running, helical gears are used but the resultant end thrust caused by this gear tooth pattern must be catered for within the mounting of the gear.
Gearbox sealing
26. Sealing of the accessory drive system is primarily concerned with preventing oil loss. The internal gearbox has labyrinth seals where the static casing mates with the rotating compressor shaft. For some o! the accessories mounted on the external gearbox, an air blown pressurized labyrinth seal is
齿轮箱封严
26．附件驱动系统的封严主要在于考虑防止滑油流失。内部齿轮箱在静止的机匣与旋转的压气机轴的配合处用篦齿式封严。对于装在外部齿轮箱上的某些附件，采用了吹风增压的篦齿式封严。这是考虑万一某个附件损坏时，防止滑油从齿轮箱进入附件装置，以及防止齿轮箱甚至发动机的污染。吹风增压封严件的使用使齿轮箱的压力比大气压力大约高3磅／平方英寸。为补充篦齿式封严的作刖，可以使用“滑油甩油环”。这是利用漏出的滑油沿传动轴流动并沿着旋转轴上的凸边向外甩出这一现象。然后，将这部分滑油再收集起来并返回齿轮箱。
离心式通风机
Accessory drives
后机匣
图7-5 一种带辅助齿轮箱传动装置的外部齿轮箱
27．为了减轻重最，要采用尽可能轻的材料。内部齿轮箱的机匣由铝合金铸成，而外部齿轮箱所处的环境温度低，所以它可以采用更轻的镁合金机匣。从强度和韧性出发，齿轮由非耐腐蚀的钢制成。齿轮经表面硬化，获得了硬度非常高的耐磨表层，同时为了齿轮平稳的啮合，齿是经过精确研磨的。
通向辅助齿轮箱
前机匣
材料
直齿正齿轮
螺旋伞齿轮
辅助齿轮箱
传动轴
辅助齿轮箱
传动机构
径向传动轴
起动机安装座
斜齿正齿轮
employed. This prevents oil from the gearbox entering the accessory unit and also prevents con-tamination of the gearbox, and hence engine, in the event of an accessory failure. The use of an air blown seal results in a gearbox pressure of about 3 lbs. per sq. in. above atmospheric pressure. To supplement a labyrinth seal, an 'oil thrower ring' may be used. This involves the leakage oil running down the driving shaft and being flung outwards by a flange on the rotating shaft. The oil is then collected and returned to the gearbox.
Materials
27. To reduce weight, the lightest materials possible are used. The internal gearbox casing is cast from aluminium but the low environmental temperatures that an external gearbox is subjected to allows the use of magnesium castings which are lighter still. The gears are manufactured from non-corrosion resistant steels for strength and toughness. They are case hardened to give a very hard wear resistant skin and feature accurately ground teeth for smooth gear meshing.
Rolls-Royce Tay
罗尔斯-罗伊斯公司
“泰”(Tay)发动机
布里斯托尔公司
“提修斯”发动机
Bristol Theseus
This engine was conceived in 1940 as a 4000 hp turbo-prop but was later scaled down to 2000 hp. Named the Theseus the engine was type tested in December 1946. the world's first turbo-prop to reach this stage of development. After extensive flight testing in an Avro Lincoln, four Theseus engines were installed in a Handley-Page Hermes 5.
该发动机于1940年按4000马力涡轮螺桨发动机方案开始设计，但是后来缩型为2000马力。以“提修斯”(Theseus)命名的该发动机于1946年12月进行了定型试车，成为世界第一台能达到这一研制阶段的涡轮螺桨发动机。在阿弗罗公司的“林肯”(Avro Lincoln)飞机上进行了广泛的飞行试验之后，4台“提修斯”发动机装用到了汉德利-佩奇公司(Handley-Page)的“赫尔姆”(Hermes)5型飞机上。
8: Lubrication
Contents Page
Introduction 73 绪言
润滑系统
Lubricating systems 73 Pressure relief valve system 减压活门系统
全流量系统
总损耗(可消耗的)系统
Full flow system
Total loss (expendable) system Oil system components 77 滑油系统部件
润滑油
Lubricating oils 83
2. The requirements of a turbo-propeller engine are somewhat different to any other types of aero gas turbine. This is due to the additional lubrication of the 2．对涡轮螺桨发动机润措系统的要求与其他类型
的航空燃气涡轮发动机多少有所不同。这是由于另
外还要润滑载荷很大的螺旋桨减速器齿轮，并且还
需要向螺旋桨桨距控制机构供给高压滑油。
3．大多数燃气涡轮发动机使用自容纳的循环式润滑
系统，它将滑油分配到发动机的各个部位，并用油泵将滑油送回滑油箱。但是，有些发动机使用一种称之为总损耗或可消耗的系统。在这种系统中，滑油润滑了发动机之后便溢出发动机外。
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