Sharp R-267LST Bedienungsanleitung PDF herunterladen (Seite 16)

4,309,917

15

supply

mainline

?uid

pressure

to,

or

exhaust

from,

1st

chamber

262

and

indicator

valve

126,

respectively,

when

neutral

shift

valve

127

is

in

the

neutral

position

or

drive

position.

Solenoid

valve

B

retains

or

exhausts

this

pressure

downstream

of

restriction

271

in

lst

chamber

262

and

supplied

to inhibitor

valve

126

respectively

when

solenoid

valve

B

is

deenergized

or

energized.

Mainline

112

is

always connected

through

restriction

270

to

2nd

chamber

feed

line

269

which

is

connected

to

solenoid

valve

A

for

pressure

control,

and

to

supply

pressure

to,

or

exhaust

from,

2nd

chamber

263

and

inhibitor

valve

126,

respectively,

when

solenoid

valve

A

is

deenergized

or

energized.

In

Neutral

and

Pivot

Steer

Manual

Ranges,

the

sole

noid

valve

A

is

energized,

so

2nd

chamber

263

adjacent

land

e

of

spool

258

will

be

exhausted,

and

spring

261

and

pressure

in

lst

chamber

262—because

solenoid

valve

B

is

deenergized——positions

neutral

shift

valve

127

in

the

neutral

position

shown

(FIG.

3B).

In

forward

and

re

verse

automatic

drive

manual

ranges,

solenoid

valve

B

is

energized

to

exhaust

lst

chamber

262

adjacent

land

a

of

spool

258

and

solenoid

valve

A

is

deenergized

so

pressure

in

2nd

chamber

263

acts

on

land

e

of

spool

258

to

cause

the

spool

258

to

shift

against

spring

261

to

drive

position.

Solenoid

valve

B

and

lst

chamber

262

are

used

so

that

if

solenoid

valve

A

is

not

energized

in

Neutral or

Pivot

Steer

manual

ranges, neutral

shift

valve

127,

in

neutral

position

nevertheless

will

remain

in

neutral

posi

tion.

Neutral

shift

valve

127,

in

neutral

position,

connects

mainline

112

to

lst

chamber

feed

line

268

and

through

restriction

271

therein

for

control

by

solenoid

valve

B

and

to

lst

chamber

262

and

inhibitor

valve

126,

advance

line

204

to

neutral

advance

line

264

for

neutral

opera

tion

of

propulsion

hydrostatic

transmission

39,

range

feed

line

267

to

exhaust

273

so

no

range

ratio

is

estab

lished,

and

automatic

advance

line

266

to

exhaust

274

so

there

is

no

automatic

advance

of

ratio

of

propulsion

hydrostatic

transmission

39.

Neutral

shift

valve

127,

in

drive

position,

connects

advance

line

204

to

automatic

advance

line

266

for

automatic

advance

of

propulsion

hydrostatic

transmission

39,

and

connects

neutral

ad

vance

line

264

to

exhaust

276.

Also,

in

drive

position

of

neutral

shift

valve

127,

mainline

112

is

connected

to

range

feed

line

267

for

range

ratio

shifting,

1st

chamber

feed

line

268

is

disconnected

from

mainline

112

and

connected

to

exhaust

274,

so

lst

chamber

262

is

ex

hausted.

Solenoid

valve

B

is

also

energized

for

exhaust

for

this

automatic

forward-reverse

drive

position.

INHIBITOR

VALVE

The

inhibitor

valve

126

(FIG.

3B),

for inhibiting

ratio

change,

has

a

spool

277

having

four

equal-diameter

lands

a,

b,

c,

and

d,

slidable

in

bore

278.

Spool

277

is

biased

to

the

normal

or

lst

ratio

range

position

shown

by

spring

279

in

spring

chamber

281

at

one end

portion

of

bore

278

vented

by

exhaust

282

when

2~3

feed

line

283

is

exhausted

in

lst

ratio

range.

Spool

277

is

moved

to

2-3

ratio

range

position

in

2nd and

3rd

ratio

ranges

when

2~3

feed

line

283

supplies

2-3

feed pressure

to

3rd

chamber

284

at

the

opposite

end

of

bore

278

to

move

spool

277

against

spring

279.

Mainline

112,

lst

(B)

and

and

2nd

(A)

chamber

feed

lines

268

and

269,

3rd

(C

and

E)

chamber

feed

line

285,

and

exhausts

286

and

287

are

connected

to

bore

278

for

control

by

spool

277.

The

letters

within

parentheses

indicate

the

solenoid

valves

supplied

by

these

chamber

feed

lines.

When

inhibitor

valves

126

and

its

spool

277

are

in lst

ratio

range

posi

25

45

65

'16

tion

shown

(FIG.

3B),

mainline

112

is

connected

only

by

restriction

270

to

2nd

chamber

feed

line

269

and

is

connected

between

lands

0

and

d

of

spool

277

to

3rd

chamber

feed

line

285,

and

lst

chamber

feed

line

268

is

blocked

from

exhaust

286

to

be

operative

and

exhaust

287

is

blocked.

When

inhibitor

valve

126

and

its

spool

277

are

in

the

2-3

ratio

range

position,

mainline

112

is

connected

between

lands

b

and

c of

spool

277

for

full

flow

to

2nd

chamber

feed

line

269

in

addition

to

the

connection

by

restriction

270,

and

lst

and

3rd

chamber

feed

lines

268

and

285

are respectively

connected

to

exhausts

286

and

287

to

exhaust

lst

chamber

262

of

neutral

shift

valve

127

and

reverse

chambers

296

and

296’

of

forward

and

reverse

signal

valves

128

and

129.

FORWARD

AND

REVERSE

SIGNAL

VALVES

The

forward

and

reverse

signal

valves

128

and

129

(FIG.

3B)

are

supplied

by

mainline

112

and

controlled

by

selectively

energized

solenoid

valves

C,

D,

E,

and

F,

to

selectively

supply

forward

or

reverse

signal

lines

288

or

289

when

the

manual

range

control

254

is,

respec

tively,

in

forward

or

reverse

range

position.

Both

for

ward

and

reverse

signal

lines

288

and

289

are

exhausted

in

neutral

and

pivot

steer

positions

of

the

manual

range

control

254.

The

forward

signal

valve

128

has

a

spool

291

having

three

equal-diameter

lands

a,

b,

and

c,

slidable

in

a

bore

292.

Spring

293,

located

in

forward

pressure

chamber

294 and

forward

shift

pressure

in

forward

pressure

chamber

294

both

act

on

land

a

of

spool

291

to

bias

spool

291

to

the

forward

position

shown,

even

if

there

is

reverse

shift

pressure

in

reverse

pressure

chamber

296.

Reverse

shift

pressure

in

reverse

pressure

chamber

296

at

the

opposite

end

of

spool

291

acts’on

land

c of

spool

291

in

the

opposite

direction

to

bias

spool

291

to

reverse

position

against

spring

293

when

forward

pressure

chamber

294

is

exhausted.

Reverse

signal

valve

129

(FIG.

3B)

has

the

same

structure

as

forward

signal

valve

128

so the

same

refer

ence

numerals

(primed)

have

been

used

for

the

structure

with

reference

to

the

above

description

of

the

forward

signal

valve

128,

and

the

different

connections

and

sole

noid

valves

are

now

described.

In

the

forward

signal

valve

128,

bore

292

is

connected

to

forward

exhaust

297,

forward

chamber

feed

line

298

and

forward

feed

line

299,

mainline

112,

reverse

feed

line

301

and

reverse

exhaust

302.

Forward

chamber

feed

line

298

has

a

restriction

303

and

is

connected

to

feed

forward

pressure

chamber

294

and

the

pressure

therein

is

controlled

by

solenoid

valve

D.

The

3rd

chamber

feed

line

285

is

connected

by

reverse

chamber

feed

line

304

which

has

restriction

306

to

feed

reverse

pressure

chamber

296,

and

the

pressure

therein

is

con

trolled

by

solenoid

valve C.

In

the

reverse

signal

valve

129,

bore

292’

is

connected

to

reverse

feed

line

301,

reverse

signal

line

289,

exhaust

307,

forward

signal

line

288

and

forward

feed

line

299.

Forward

chamber

feed

line

308 having

restriction

309

connects

forward

signal

line

288

to

feed

forward

cham

ber

294’,

and

the

pressure

therein

is

controlled

by

sole

noid

valve

F.

The

3rd

chamber

feed

line

285

is

also

connected

by

reverse

chamber

feed

line

311

having

restriction

312

to

feed

reverse

pressure

chamber

296',

and

the

pressure

therein

is

controlled

by

solenoid

valve

E.

When

gear

ratio

control

420

is

providing

neutral

or

lst

ratio

range

for

forward

or

reverse

drive,

the

2—3

feed

line

283

is

exhausted,

so

inhibitor

valve

126

supplies

3rd

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 33 34

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