Reverse Driving At Constant Speed (2Wd); Reverse Deceleration - Honda CR-V 1997 Service Manual

Description
Hydraulic Flow (cant'd)
Reverse Driving at Constant Speed 12WD)
When driving in reverse at a constant speed. the dual pump system functions in two wheel drive mode.
The rotati on speed of th e front and rear whee ls is the same, so the speed of the front and rear pumps is also the same.
Fluid discharged by the front oil pump is drawn in by the rear oil pump and is circu lated through the system. But, because
the there is a difference in the capacity between the two pumps. fluid flows through check valve E, and then through
o ri ~
fices. This flu id lubricates and cools the clutch assembly and bearings.
Is this condition, only a low pressure is built up at the clutch piston. Th erefore the clutch does not engage, and the vehicle
remain s in 2WD (front wheel drive).
ORIFICES FRONT OiL PUMP
REAR PUMP
Reverse Deceleration (4WD)
During reverse deceleration, the dual pump system can engage four wheel drive.
When decelerating in reverse direction, the speed of the rear wheels may exceed the speed of the front wheels (due to
engin e braking). In this co ndition, the rear oil pump draws fluid through check valves Band C. Fluid discharged from the
rear oil pump then flows through check valve E to the dutch piston. There, pressure is regulated by two orifices.
The regu lated hydraulic pressure at the clutch piston may force the plates and discs of the clutch together to form a con-
nection. The engaged clutch passes driving force from th e transfer assembly to the rear w heels, producing 4WD.
REAR OIL PUMP
15-8