As shown in FIG 1A and FIGS 2 to 4, a control valve assembly 16 for {HEAD ~ the fluid operated speed change mechanism} 6 is mounted on the front bearing support plate 10A, and {TAIL ~ fluid passages} 18 and 19 for connecting the control valve assembly 16 to the annular chambers 14a and 15a are formed between the front and rear bearing support plates 10A and 10B 
As shown in FIG 1A and FIGS 2 to 4 , a control valve assembly 16 for { HEAD ~ the fluid operated speed change mechanism } 6 is mounted on the front bearing support plate 10A , and { TAIL ~ fluid passages } 18 and 19 for connecting the control valve assembly 16 to the annular chambers 14a and 15a are formed between the front and rear bearing support plates 10A and 10B
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