Sharp R-267LST Bedienungsanleitung PDF herunterladen (Seite 17)

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17

chamber

feed

line

285,

and

forward

and

reverse

signal

valves

128

and

129

are

moved

to

all

manual

range

posi

tions

in

response

to

manual

range

control

254,

as

de~

scribed

below.

When

the

manual

range

control

254

is

in

forward

position,

in

forward

and

reverse

signal

valves

128

and

129,

respectively,

solenoid

valves

C

and

F

are

energized

to

exhaust

reverse

pressure

chambers

296

and

296',

so

springs

293

and

293’

move

both

forward

and

reverse

signal

valves

128

and

129

to

the

forward

position

shown

(FIG.

3B).

When

forward

signal

valve

128

is

in

forward

position,

forward

exhaust

297

is

blocked, mainline

112

is

connected

to

feed

forward

chamber

feed

line

298

and

forward

feed

line

299

and

exhaust

reverse

feed

line

301

to

reverse

exhaust

302.

When

reverse

signal

valve

129

is

in

forward

position,

forward

feed

line

299

is

connected

to

supply

forward

signal

pressure

to

forward

signal

line

288,

reverse

signal

line

289

is

connected

to

exhaust

307,

and

reverse

feed

line

301

is

blocked.

Since

mainline

pressure

is

supplied

to

both

forward

chamber

feed

lines

298

and

308

which

respectively

feed

forward

pressure

chambers

294

and

294',

solenoid

valves

D

and

F

are

deenergized

and

thus

closed,

so

both

forward

pressure

chambers

294 and

294'

are

pressurized

to

hold

both

forward

and

reverse

signal

valves

128

and

129

are

in

forward

position

supplying

forward

signal

line

288.

When

manual

range

control

254

is

in

neutral

range

position,

solenoid

valves

C

and

D

are

respectively

ener

gized

and

denergized

as

in

forward

range

position,

so

forward

signal

valve

128

remains

in

‘the

forward

posi

tion

and

functions

as

described

above

for

forward

posi

tion.

In

this

neutral

range

position

of

manual

range

control

254,

the

energization

of

solenoid

valves

E

and

F

is

reversed—E

being

deenergized

and

F

energized-so

reverse

pressure

chamber

296’

is

pressurized

and

for

ward

pressure

chamber

294'

is

exhausted, so

reverse

signal

valve

129

is

moved

to

reverse

position.

Thus

forward

signal

valve

128

in

forward

position

provides

the

above-described

connections.

Reverse

signal

valve

129

in

reverse

position

blocks

forward

feed

line

299

at

land

c of

spool

291',

connects

forward

signal

line

288

to

exhaust

307

and

connects

reverse

signal

line

289

to

reverse

feed

line

301

for

connection

by

forward

signal

valve

128

to

reverse

exhaust

302,

so

both

the

forward

and

reverse

signal

lines

288

and

289

are

exhausted

in

neutral

manual

range.

In pivot

steer

manual

range

position

of

manual

range

control

254,

the

same

solenoid

valves

are

energized

to

provide

the

same

operation

exhausting

both

forward

and

reverse

signal

lines

288

and

289

as

in

neutral

manual

range

position

described

above.

When

manual

range

control

254

is

in

reverse

position,

solenoid

valves

C-and

E

are

deenergized

to

pressurize

reverse

chambers

296

and

296‘,

and

solenoid

valves

D

and

F

are

energized

to

exhaust

forward

chambers

294

and

294’

so

both

forward and

reverse

signal

valves

128

and

129

are

in

reverse

position.

In

forward

signal

valve

128,

mainline

112

is

connected

to

reverse

feed

line

301

and

both

forward

feed

line

299 and

forward

chamber

feed

line

298

are

connected

to

forward

exhaust

297.

In

reverse

signal

valve

129,

forward

signal

line

288

and

forward

chamber

feed

line

308

are

connected

to

exhaust

307

and

reverse

feed

line

301

is

connected

to

supply

mainline

pressure

to

reverse

signal

line

289.

In

2nd and

3rd

ratio

ranges,

inhibitor

valve

126

ex

hausts

3rd

chamber

feed

line

285

so

the

reverse

pressure

chambers

296

and

296‘

cannot

be

pressurized-even

though

solenoid

valves

C

and

E

are

deenergized-so

—

5

20

25

30

40

45

50

60

65

18

both

forward

and

reverse

signal

valves

128

and

129

cannot

be

shifted

to

reverse

position.

Thus

during

oper

ation

in

forward

manual

range,

2nd

or

3rd

ratio

range,

a

shift

to

neutral,

pivot

steer,

or

reverse

manual

ranges

will

be

inhibited

until

ratio

range

is

reduced

to

1st

ratio

range,

where

shifts

between

all

manual

ranges

are

per

mitted.

In

neutral

and

pivot

steer

manual

range

positions,

forward

signal

valve

128

is

in

forward

position

and

reverse

signal

valve

129

is

in

reverse

position.

On

a

shift

to

forward

manual

range

position,

only

reverse

signal

valve

129

is

shifted

to

forward

position

by

spring

293’

when

reverse

pressure

chamber

296'

is

exhausted

byv

solenoid

valve

E,

and

then

forward

signal

pressure

from

forward

signal

line

288

via

forward

chamber

feed

line

308

pressurizes

forward

chamber

294'

as

solenoid

valve

F

is

deenergized

and

closed.

On

a

shift

to

reverse

man

ual

range,

only

forward

signal

valve

128

is

shifted

to

reverse

position

by

energizing

solenoid

valve

D

to

ex

haust

forward

chamber

294

and

deenergizing

solenoid

valve

C

to

pressurize

reverse

pressure

chamber

296.

On

a

direct

shift

from

forward

to

reverse

manual

range

positions,

quickly

through

neutral,

both

solenoid valves

D

and

F

are

energized

to

exhaust

forward

pressure

chambers

294

and

294’

and

both

solenoid

valves

C

and

E

are

deenergized

to

pressurize

reverse

pressure

cham

bers

296

and

296’

to

shift

both

forward

and

reverse

signal

valves

128

and

129

to

reverse

position to

supply

reverse

signal

line

289.

On

a

reverse

to

forward

manual

range

shift,

both

soleniod

valves

C

and

E

are

energized

to

exhaust

reverse

pressure

chambers

296

and

296’

so

springs

293

and

293'

shift

both

forward

and

reverse

signal

valves

128

and

129

to

forward

position

to

supply

forward

signal

pressure

to

forward

signal

line

288

and

pressurize

forward

pressure

chambers

294 and

294'

as

solenoid

valves

D

and

F

are

deenergized.

DISCONNECT

VALVE

Disconnect

clutch

valve

125

(FIG.

3B)

has

a

spool

314

having

three

equal-diameter

lands

a,

b,

and

c,

slid

able

in

a

bore

316.

At

one

end

of

disconnect

valve

125,

spring

317

in

disconnect

chamber

318 and

pressure

in

disconnect

chamber

318

may

both

act

on

the

end

of

land

a

of

spool

314

to

bias

spool

314

to

disconnect

position

shown.

At

the

other

end

of

disconnect

valve

125,

pres

sure

in

connect

chamber

319

may

act

on

the

end

of

land

c

of

spool

314

in

the

opposite

direction

to

the

connect

position.

Disconnect

valve

125,

with

spool

314

in

the

disconnect

position

shown,

connects

disconnect

clutch

24

via

disconnect

clutch

apply

line

321

to

release

dis

connect

clutch

24,

connects

mainline

112

to

disconnect

chamber

feed

line

323

which

has

restriction

324,

and

connects

mainline

112

to

steer

signal

line

326. In

con

nect

position

of

spool

314,

disconnect valve

125

con

nects

mainline

112

to

disconnect

clutch

apply

line

321

to

apply

disconnect

clutch

24

and

connects

disconnect

chamber

feed

line

323

and

steer

signal

line

326

to

ex

haust

327.

Mainline

112

is

connected

by

connect

cham

ber

feed

line

328

which

has

restriction

329,

and

down

stream

thereof

is

controlled

by

solenoid

valve

G

to

control

pressure

in

connect

chamber

319.

Disconnect

chamber

feed

line

323,

downstream

of

its

restriction

324,

is

controlled

by

solenoid

valve

H

and

supplies

disconnect

chamber

318.

When

the

manual

range

control

254

is

in

neutral

posi

tion,

solenoid

valve

G

is

energized

to

exhaust

connect

chamber

319

so spring

317

moves

spool

314

to

the

dis

connect

position

shown

(FIG.

3B),

and

then

mainline

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 33 34

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