2-7
Rotary group
The rotary group consists of drive shaft
(F)(111), cylinder block (012), piston
shoes (151,152), set plate (153), spherical
bush (156) and cylinder spring (157). The
drive shaft is supported by bearing
(123,124) at its both ends.
The shoe is caulked to the piston to from
a spherical coupling. It has a pocket to
relieve thrust force generated by loading
pressure and the take hydraulic balance
so that it slides lightly over the shoe plate
(211). The sub group composed by a
piston and a shoe is pressed against the
shoe plate by the action of the cylinder
spring via a retainer and a spherical bush.
Similarly, the cylinder block is pressed
against valve plate (313) by the action of
the cylinder spring.
Swash plate group
The swash plate group consists of swash
plate (212), shoe plate (211), swash plate
support (251), tilting bush (214), tilting pin
(531) and servo piston (532).
The swash plate is a cylindrical part
formed on the opposite side of the sliding
surface of the shoe and is supported by
the swash support.
If the servo piston moves to the right and
left as hydraulic force controlled by the
regulator is admitted to hydraulic chamber
located on both sides of the servo piston,
the swash plate slides over the swash
plate support via the spherical part of the
tilting pin to change the tilting angle (
ɷ
)
2. FUNCTION
MAIN PUMP
The pumps may classified roughly into the rotary group performing a rotary motion and working as
the major part of the whole pump function: the swash plate group that varies the delivery rates: and
the valve cover group that changes over oil suction and discharge.
1)
(1)
(2)
123
111
211
153
151
152
156
157
012
124
313
32092MP03
531
211
548
214
212
251
532
3607A2MP10
ɷ
ɷ
