目录
履带拖拉机无级变速器设计(操纵机构设计)...............................................................................................................1
摘要.............................................................................................................................................1
DESIGNOFTRACKEDTRACTORVARIABLECONTINOUSLYTRANSMISSION(CONTROL.....................................................................................2
MECHANISM)........................................................................................................................................2
ABSTRACT..........................................................................................................................................2
第一章绪论........................................................................................................................................4
第二章液压机械无级变速器传递方案的确定.................................................................................................................5
§ 2.1 压机械无级传动的原理及特点.....................................................................................................................5
(1,-:i)nc=n「+、£g(2-1).......................................................................................................................6
ts=
t
r(
2-2
).....................................................................................................................................6
1.............................................................................................................................................6
t
s
=——
c
(2-3)...................................................................................................................................6
1+a...........................................................................................................................................6
:(2-4).......................................................................................................................................6
机的额定转速 n=2300r/min。.......................................................................................................................7
(2-7)........................................................................................................................................10
(k 1)i2i3 -e.................................................................................................................................10
(2-8)........................................................................................................................................10
第三章液压调速油路的设计...........................................................................................................................11
§ 3.1 量泵与定量马达排量的确定.....................................................................................................................11
式中:M 为转矩,N.m;P 为功率,KWn 为转速,r/min 其中:P=106;n=2300。..................................................................................13
所以:M=9550106/2300..........................................................................................................................13
二 440........................................................................................................................................13
M!=
M3
k(2-10)..................................................................................................................................13
令 K=3;则 m,=
440
3;...............................................................................................................................13
i2i3=0.5971;.................................................................................................................................13
440//........................................................................................................................................13
所以:M=,""5971...............................................................................................................................13
=223.3;......................................................................................................................................13
令:△P=40MPa;M=223.3;........................................................................................................................13
=2 二 223.3/40.................................................................................................................................13
=35.1........................................................................................................................................13
那二%...........................................................................................................................................15
1.273292.6...................................................................................................................................17
(2-13).......................................................................................................................................17
=10.6+8.5....................................................................................................................................17
L-AN46。其道动黏度为:=0.45cm/O.................................................................................................................17
§3.2 液压油路压力损失的确定.........................................................................................................................17
(2—14).......................................................................................................................................17
du...........................................................................................................................................17
_1.273292.6..................................................................................................................................17
=150.45......................................................................................................................................17
10
4
...........................................................................................................................................17
=490<2300....................................................................................................................................17
印十二曲「旦.....................................................................................................................................19
I-旧)_.........................................................................................................................................19
§ 3.3 箱尺寸的确定...............................................................................................................................19
=5.13........................................................................................................................................22
=30+5.13.....................................................................................................................................22
=35.13(2—21).................................................................................................................................22
§ 3.4 压元件的选择...............................................................................................................................22
=143.51......................................................................................................................................22
第四章液压机械无级变速器液压控制油路设计..............................................................................................................23
§ 4.1 路设计....................................................................................................................................23
V=0.848......................................................................................................................................28
F= 93.1......................................................................................................................................28
V=1.139......................................................................................................................................28
F=63.8.......................................................................................................................................28
V=1.662......................................................................................................................................28
F=38.6 K.N —63.8 K.N ;.......................................................................................................................28
V=2.747 m/s—5.555m/s ;.......................................................................................................................28
§ 4.2.1 济性换挡...............................................................................................................................28
1. 如果:Fr-93.1K.N?..........................................................................................................................28
2. Fr63.8K.N—93.1K.N.........................................................................................................................28
v............................................................................................................................................28
v............................................................................................................................................29
2.Fr63.8K.N—93.1K.N?.........................................................................................................................30
v............................................................................................................................................30
38.6.........................................................................................................................................30
3............................................................................................................................................30
-63.8 K.N ?..................................................................................................................................30
4............................................................................................................................................30
Fr 19.1......................................................................................................................................30
-38.6 K.N ?..................................................................................................................................30
4.2.2........................................................................................................................................30
有:F=£f =1.20 时,V 0.848 v F r...............................................................................................................30
2. F=E,旦=1.15 时,V1.139—1.662?vFR...........................................................................................................31
3. F=卫,一=1.1 时,V1.662—2.747?...............................................................................................................31
vFR..........................................................................................................................................31
4. □=卫,-八=1.05 时)V2.747m/s—5.555m/s?.......................................................................................................31
vFR..........................................................................................................................................31
P............................................................................................................................................31
F="=1.20 时,V0.848—1.139?.....................................................................................................................32
10. F=P,匚=1.15 时,V1.139—1.662?..............................................................................................................32
11. F=卫,一=1.1 时,V1.662—2.747?..............................................................................................................32
vFr..........................................................................................................................................32
12. 口=卫一=1.05 时,V2.747m/s—5.555m/s?........................................................................................................32
第五章结论.......................................................................................................................................34
参考文献.........................................................................................................................................35
致谢................................................................................................................................................37