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§3-9 习 题 3-1 选择齿轮材料时，为何小齿轮的材料要选得比大齿轮好些或小齿轮的齿面硬度取得高些？ 3-2 试画出图3-22所示减速器中各齿轮上所受各力的方向(径向力、圆周力和轴向力)。 3-3 双级斜齿圆柱齿轮减速器如下图所示，要求轴II上的两齿轮产生的轴向力Fa2与Fa3相互抵消。设worm gearboxes, planetary gearboxes, screw jacks, cycloidal reducers, ring gears, pto shafts一对齿轮的螺旋角β1=15°，试确定worm gearboxes, planetary gearboxes, screw jacks, cycloidal reducers, ring gears, pto shafts二对齿轮的螺旋角β2＝？worm gearboxes, planetary gearboxes, screw jacks, cycloidal reducers, ring gears, pto shafts二对齿轮3和4的螺旋线方向如何？
3-4 有一台单级直齿圆柱齿轮减速器。已知：z1 ＝32，z2 ＝108，中心距a=210mm，齿宽b=72mm，大小齿轮材料均为45号钢，小齿轮调质，硬度为250～270HBS，齿轮精度8级。输入转速n1=1460r/min。电动机驱动，载荷平稳，齿轮寿命为10000小时。试求该齿轮传动所允许传递的最大功率。 3-5 试设计提升机构上用的闭式直齿圆柱齿轮传动。已知：齿数比 u=4.6，转速n1 =730r/min，传递功率P1＝10kW，双向传动，预期寿命5年，每天工作16小时，对称布置，原动机为电动机，载荷为中等冲击，z1＝25，大小齿轮材料均为45号钢，调质处理，齿轮精度等级为8级，可靠性要求一般。 3-6 试设计闭式双级圆柱齿轮减速器(见图3-22)中高速级斜齿圆柱齿轮。已知：传递功率P1＝20kW，转速n1=1430r/min，齿数比u＝4.3，单向传动，齿轮不对称布置，轴的刚性较小，载荷有轻微冲击。大小齿轮材料均用40Cr，表面淬火，齿面硬度为48～55HRC，齿轮精度为7级，两班制工作，预期寿命5年，可靠性一般。 3-7 试设计一闭式单级直齿圆锥齿轮传动。已知：输入转矩T1 ＝90.5N.m，输入转速n1=970r/min，齿数比u=2.5。载荷平稳，长期运转，可靠性一般。 3-8 校核一对直齿圆锥齿轮传动所能传递的功率P1。已知：z1＝18，z2＝36，m=2mm, b=13mm, n1=930r/min，由电动机驱动，单向转动，载荷轻微冲击，工作寿命24000小时，齿轮材料为45号钢，小齿轮调质，硬度为250～280HBS，大轮正火，硬度为190～210HBS，齿轮精度8级，小锥齿轮悬臂布置，设备可靠性要求较高。
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