lA?lB?b12b12??2??3?B?a??5?b22?b32722?8.5?3?16?16?47.5mm722?5?622?1042
?8.5?3?16?16?135.5mm??2??3?B?a?
M?Fd161.76a12?0.767?2?23.68Nm RFr1lB?M1H?l?1.176?135.5?23.68A?lB135.5?47.5?1KN RFr1lA?M2H?l?1.176?47.5?23.68?175.8NA?lB135.5?47.5
RlBF135.51V?lt1?A?lB135.5?47.5?3.14?2.32KN RlA2V?lF47.5t1?A?lB135.5?47.5?3.14?0.815KN
M22max?MH?MV?120NmT?96.96Nm
M ?maxca?(W)2?4(?T22W)?5.1MPa
17CrNiMo6的??F?远大于此，故该轴强度满足要求。
2、Ⅱ轴校核
Ⅱ轴受力分析： a）
b)
c)
26
d)
e)
f)
Ft2?2T2d2?2?437.75288.235?3.04KN?
Fr2?Ft2tan?cos?d22?3.04?tan20??cos1343'45''288.2352?1.138KN
Fa2?Ft2tan??3.04tan1343'45''?0.743KN
M2?Fa2?0.743??105.78Nm
齿轮三的受力分析：
Ft3?2T3d3?2?437.7593.477?9.366KN?
Fr3?Ft3tan?cos?d32?9.366?tan20??cos1540'45''93.4772622?3.54KN
Fa3?Ft3tan??9.366tan1540'45''?2.63KN
M3?Fa3lA?lB?b12b12?0.734??34.31Nm
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??2??3?B?a??5?b22?b32?8.5?3?19?18.6?47.9mm722?5?622?1042??2??3?B?a???8.5?3?19?18.6?135.9mm
R3H?Fr3lA?Fr2lB?M2?M3?3.54?47.9?1.138?135.9?105.78?34.31?0.843KNlA?lB135.9?47.9R4H?Fr3?Fr2?R3H?3.54?1.138?0.843?1.559KNRFt2lB?Ft3lA3.04?135.9?9.366?47.9
3V?l?A?lB135.9?47.9?4.689KN RFt2lA?Ft3lB3.04?47.9?9.366?135.94V?l?A?lB135.9?47.9?7.717KN
M22max?MH?MV?385.43NmT2?437.75Nm
d3bt(d?t)2??503?10?9W??14?5.5?(50?5.5)2?10?932?2d?32?2?50?1.075?10?5
W?d32?9t??bt(d?t)503?1014?5.5?(50?5.5)2?10?9?5162d???16?2?50?2.302?10
?(Mmax)2?4(?T22ca?WW)?42.5MPat
45钢的??F?=60MPa大于此，故该轴强度满足要求。
3、Ⅲ轴校核
齿轮四的受力分析： a)
b)
c)
d)
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e)
f)
Ft4?2T3d4?2?1482.56336.518?8.81KN?
Fr4?Ft4tan?cos??8.81?tan20??cos1540'45''722?3.33KN
Fa4?Ft4tan??8.81tan1540'45''?2.473KN
lA?lB?b12b12??2??3?B?a??5?b22?b32?8.5?3?22?25.4?44.1mm722?5?622?1042??2??3?B?a??8.5?3?22?25.4?132.1mm
M?Fa4d42M?Fr4lA?2.473?336.5182416.1?3.33?44.1?416.1Nm
R5H?R6H?R5V?R6V?lA?lBFr4lB?MlA?lBlAlA?lBlBlA?lB??132.1?44.1132.1?44.144.1132.1?44.1132.1132.1?44.12?1.528KN3.33?132.1?416.1?4.836KN
Ft4?Ft4?2?8.81?2.205KN?8.81?6.605KN
Mmax?MH?MV?354.38Nm
3?92?9T2?1482.56Nm
2W?Wt??d323?3bt(d?t)2d?2??88?1032??914?5.5?(88?5.5)?102?8814?5.5?(88?5.5)?102?882?6.394?10?9?5
?5?d16?bt(d?t)2d???88?10163??13.083?10
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?Mmax2ca?(W)2?4(?T2W)?14.7MPat
45钢的??F?=60MPa远大于此，故该轴强度满足要求。
八、键的校核
1、Ⅰ轴键的选择和校核
根据联轴器选择A型（圆头普通平键）键，基本尺寸如下： 公称直径b*h L t d 32 10*8 63 5 ?T2?96.96p?2dlk?32?63?3?32MPa???F?
满足要求。
2、Ⅱ轴键的选择和校核
选择A型（圆头普通平键）键，基本尺寸如下： 齿轮2所用： 公称直径b*h L t d 47 14*9 50 5.5 ?T2?437.75p?2dlk?47?50?3.5?106.4MPa???F??120MPa
满足要求。
齿轮3所用： 公称直径b*h L t d 50 14*9 90 5.5 ?p?2T437.75dlk?2?50?90?3.5?55.6MPa???F??120MPa
满足要求。
3、Ⅲ轴键选择及校核
齿轮四所用： 公称直径b*h L t d 88 25*14 80 9
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