61
CHAPTER 5. HYDROSTATIC TRANSMISSION
3. FUNCTION
3.1. VARIABLE TYPE PUMP
Nine pistons are housed in the cylinder block, which is connected to the engine and revolves as the
engine does, while the slant board does not. When the slant board and shaft are perpendicular to each
other, cylinder displacement volumes A and B do not vary, so no delivery or suction takes place.
Slant board
Spline
Piston
A
B
Cylinder block
Shaft
INPUT
Fig. 8-3
If the slant board is angled by α degrees, displacement volumes A and B become different from each
other: A > B. If the shaft turns in the direction of “Q,” delivery of fluid takes place as the displacement
volume varies from B to A. Consequently if delivery and suction pipes are connected to the two arched
ports respectively, a pump mechanism is formed. In this case, “Ps” is the suction port and “Pd” is the
delivery port.
Fig. 8-4
α
A
B
Q
Pd Ps
INPUT
To Next Page
Loading...
Need help?
General
