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