Fluid supply system in vehicles

In a vehicle wherein a supplementary speed change mechanism (12;

• 112) having two fluid-operated clutches (29F, 29R;
• 129L, 129H), which are operated selectively one at a time, and at least one main speed change mechanism (15;
• 18) having plural fluid-operated clutches (36, 37, 38;
• 45, 46, 47), which are operated selectively one at a time, are connected in series and wherein fluid pressure applied to one of said fluid-operated clutches of said supplementary speed change mechanism (12;
• 112) under operation is once reduced automatically in response to the shifting operation of said main speed change mechanism (15;
• 18), a fluid supply system which comprises:
• a flow control valve (50) which is connected to an output flow path (49) of a hydraulic pump (48) and which is operable to divide its inflow into a constant flow flowing out through a constant flow path (51) and a surplus flow flowing out through a surplus flow path (53);
• and
• a flow divider valve (52;
• 52A) which is connected to said constant flow path (51) and which is operable to divide its inflow into two divided flows of a constant ratio, one of said two divided flows flowing out through a first branch path (54) and the other of said two divided flows flowing out through a second branch path (55);
• said fluid-operated clutches (36, 37, 38;
• 45, 46, 47) of said main speed change mechanism (15;
• 18) being adapted to be supplied with operating fluid through said first branch path (54), said fluid-operated clutches (29F, 29R;
• 129L, 129H) of said supplementary speed change mechanism (12;
• 112) being adapted to be supplied with operating fluid through said second branch path (55), and said fluid-operated clutches (29F, 29R;
• 129L, 129H) of said supplementary speed change mechanism (12;
• 112) being adapted to be supplied with lubricant through said surplus flow path (53).