Sharp R-267LST Bedienungsanleitung PDF herunterladen (Seite 18)

19

112

feed

disconnect

chamber

feed

line

323

to

pressurize

disconnect

chamber

318,

as

solenoid

valve

H

is

deener

gized,

and

feed

steer

signal

line

326.

In

the

other

manual

range

positions

(forward,

pivot

steer,

and

reverse),

sole

noid

valve,

G

is

deenergized

to

pressurize

connect

chamber

319

and

solenoid

valve

H

is

energized

to

ex

haust

disconnect

chamber

318;

so

disconnect

valve

125,

with

its

spool

314

in

connect

position,

connects

mainline

112

to

clutch

apply

line

321

to

apply

disconnect

clutch

24,

and

connects

steer

signal

line

326

and

disconnect

chamber

318

and

its

feed

line

323

to

exhaust

327.

As

pointed

out

below,

steer

signal

line

326

prevents

steer

ing

in

neutral.

ADVANCE

RETURN

SIGNAL

SYSTEM

Neutral

Shuttle

Valve

The

return

line

205

is

supplied

by

advance

return

signal

system

160

(FIG.

3C).

The

neutral

advance

line

264

is

supplied

by

neutral

shift

valve

127

in

neutral

position,

in

neutral

and

pivot

steer

manual

ranges,

from

advance

line

204

supplied

by

advance

return'

signal

system

160.

Return

line

205

and

neutral

advance

line

264,

which

alternatively

have

re

turn

signal

pressure

or

neutral

advance

signal

pressure,

are

connected

to

neutral

shuttle

valve

256 (FIG.

3B),

which

connects

the

one

of

return

line

205

or

neutral

advance

line

264

having

a

signal

pressure

to

l-2-3

return

line

331.

RETURN

SIGNAL

CONTROL

VALVE

The

return

signal

control

valve

332

(FIG.

3B)

has a

spool

333

with

three

equal-diameter

lands

a,

b,

and

c,

slidable

in

a

bore

334

and

biased

to

lst

or

low

position

shown

by

spring

335 engaging

land

c

of

spool

333

and

located

in

chamber

336

in

one end

of

bore

334

vented

by

exhaust

337.

The

2—3

feed

pressure supplied

by

2—3

feed

line

283

in

2nd

and

3rd

ratio

ranges

to

operating

cham

ber

338

in

the

opposite

end

of

bore

334

at

the

opposite

end

of

spool

333

to

act

on

land

a

of

spool

333

to

move

spool

333

against

spring

335

to

2—3

position.

With

return

signal

control

valve

332

and

its

spool

333

in

lst

or

low

position

shown,

1-2-3

return

line

331

is

connected

to

lst

or

low

return

line

339

and

2—3

return

line

341

is

con

nected

to

exhaust

342.

With

return

signal

control

valve

332

and

its

spool

333

in

2—3

position,

1-2-3

return

line

331

is

connected

to

2—3

return

line

341

and

lst

return

line

339

is

connected

to

exhaust

343.

The

1st

or

low

return

line

339

is

supplied

in

neutral

or

pivot

steer

man

ual

ranges

by

neutral

advance

line

264

or

return

line

205

and

thus

has

pressure

at

all

times

and

is

supplied

in

forward

and

reverse

manual

ranges

only

in

lst

and

reverse

ratio

drive

only

with

return

signal

pressure

from

return

line

205.

ADVANCE

SIGNAL

CONTROL

VALVE

The

advance

signal

control

valve

344

(FIG.

3B)

has

a

spool

346 having

three

equal-diameter

lands

a,

b,

and

c,

and

a

piston

347

of

the

same

diameter

slidable

in

a

bore

348.

Piston

347

is

engageable

with-

land

a

of

spool

346.

A

spring

349,

seated

on one

end

wall

350

of

bore

348

and

located

in

spring

chamber

351

in

bore 348

and

vented

by

exhaust

352,

engages

land

0

of

spool

346

to

bias

spool

346

to

engage

piston

347

which

abuts

the

other

or

opposite

end

wall

353

of

bore 348

when

ad

vance

signal

control

valve

344 and

its

spool

346

are

in

the

1-3

position

shown

(FIG.

3B)

in

1st

and

3rd

forward

ratio

ranges.

4,309,917

,...

0

45

50

55

60

65

20

Reverse

signal

line

329

supplies

reverse

signal

pres~

sure

to

reverse

chamber

354

in

bore

348

between

piston

347 and

other

end

wall

353.

The

2nd

clutch

line

356,

which

supplies

2nd

clutch

pressure

to

engage

2nd

clutch

88,

is

connected

to

2nd

clutch

chamber

357

in

bore

348

between

piston

347

and

land

a

of

spool

346.

When

the

propulsion

drive

13

is

operating

in

reverse

drive

or

2nd

forward

ratio

range

drive,

and

thus

either

reverse

signal

line

289

supplies

pressure

to

reverse

chamber

354

or

2nd

clutch

line

356

supplies

pressure

to

2nd

clutch

chamber

357,

the

spool

346

is

moved

against

spring

349

to

R-2nd

position.

-

The

advance

signal

control

valve

in

1-3

position

shown

(FIG.

3B),

connects

2—3

return

line

341

to

2nd

minus

ratio

change

feed

line

358

and

connects

automatic

advance

line

266

to

one

branchline

359

of

1st

ratio

change

feed

line

361.

The

other

branchline

360

of

lst

plus

ratio

change

feed

line

361

is

blocked.

In

the

R-2nd

position,

the

advance

signal

control

valve

344

reverses

the

connections

and

connects

2-3

return

line

341

to

the

other

branchline

360

and

lst

ratio

change

feed

line

361

and

connects

automatic

advance

line

266

to

2nd

ratio

change

feed

line

358.

The

one

branchline

359

of

lst

ratio

change

feed

line

361

is

blocked.

The

lst

and

2nd

ratio

change

feed

lines

361

and

358

respectively

provide

a plus

signal

for

changing

displace

ment

from

maximum

negative

displacement-

toward

or

to

maximum

positive

displacement

in

H1

or

pump

unit

41

to

a

lower

negative

displacement

in

H2

or

motor

unit

42,

and

a

minus

signal

for

oppositely

changing

displace

ment

from

any

value

toward

or

to

maximum

negative

displacement

in

H1

and

H2

units

41

and

42.

As

shown

in

the

following

TABLE

II,

the

2nd

ratio

change

feed

line

358

provides

the

2—3

return

signal

(R)

in

3rd

ratio

range

and

the

automatic

advance

signal

(A)

in

Reverse

and

2nd

ratio

ranges.

The

lst

ratio

change

feed

line

361

provides

the

2—3

return

signal

(R)

in

re

verse

and

2nd

ratio

ranges

and

the

automatic

advance

signal

(A)

in

1st

and

3rd

ratio

ranges.

TABLE

II

Ratio

Change

Manual

Ratio

Feed

Lines

Ranges Ranges

lst

2nd

Fwd

l

A

O

Fwd

2

R

A

Fwd

3

A

R

Rev Rev

R

A

N

N O O

ZERO

STROKE

BIAS

VALVE

The

zero

stroke

bias

valve

363 (FIG.

3A)

is

similar

to

the

above

US.

Pat.

No.

3,590,577

and

has a

valve

spool

364

with

two

equal-diameter

lands

a

and b

slidable

in

a

bore 365

in

a

valve

sleeve

366.

The

spool

364

is

con

nected

by

linkage

367,

which

includes

a

pin

368

and

adjustment

device

369, to

pump

ring

370.

The

pin

368

is

secured

to

ring 370,

which

is

the

bearing

ring

and

dis

placement

change

member

moving

proportionally

to

displacement,

of

known

pump

or

H1

hydrostatic

unit

42

of

propulsion

hydrostatic

transmission

39.

The

linkage

367

which

connects

pump

ring

370

to

valve

spool

364

for

common

movement

has

adjustment

device

369

so

the

position

of

the

valve

spool

364

can be

manually

adjusted

to

the

proper

position

relative

to

the

position

of

pump

ring

370.

The

adjustment

device

369,

as

shown,

has a

head

apertured

to

receive

pin

368

and

a

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