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SANY Crawler Hydraulic Excavator (SY195C9, SY205C9, SY215C9, SY225C9). Shop Manual (2013) - page 10

Structure and Function

4.6.6 Travel motor

Model: TM40VD-A-99/163-1

NOTE: For the location of the travel motor on the machine, see “Hydraulic equipment layout” on

page 4-24.

D1

A

P

P1

P2

B

D2

P5

WX215-1204014G

Ps:

Duo speed pilot hose port

D1:

Drain port

P1:

Pressure detection port

D2:

Plug

P2:

Pressure detection port

A:

Main oil port

P5:

Parking brake release port

B:

Main oil port

Working condition

Speed 1

Speed 2

Gear ratio

49.95

Reduction gear

Theoretical output torque

(kgf.m)

Max. 4650

4535

2767

Theoretical output speed

(r.p.m)

Max. 60

28

45.9

Displacement

(cc/rev)

Max. 174.7

162.9

99.4

Continuous pressure

(kgf/cm2)

Max. 350

350

Theoretical speed

(r.p.m)

Max. 2800

1400

2294

Hydraulic motor

Flow

(l/min)

250

228

Duo speed control pressure

(kgf/cm2)

20~70

Braking torque

(kgf.m)

Min. 50

Brake release pressure

(kgf/cm2)

8.2

1~3L/min (above 365)

Relief valve activation pressure

15L/min (above 420)

4-91

Structure and Function

Explosive view

37

38

46

50

43

42

15

40

41

5

10

1

44

8

22

6

34

11

35

47

14

48

49

21

33

3

9

19

7

42

4

15

27

20

21

6

30

23 24

8

29

10

14

31

5

15

32

18

15

17

2

36

54

25

52

28

55

4

12

51

7

39

56

9

58

45

3

57

26

53

59

13

16

WX215-1204013G

1) Flange, rear

16)

Plug

31) Baffle

46)

Ball bearing

2) H5 balance valve

17)

Spool

32) Spheric bush

47)

Spring

spool

18)

Spring

33) Timing plate

48)

Piston

3) Plug

19)

Ball

34) Parking piston

49)

Stopper

4) D type block

20)

Orifice

35) Spring

50)

Pivot

5) Check plug

21)

O-ring

36) C y l i n d e r b l o c k

51)

Plunger

6) Check valve

spring

22)

Filter

52)

Piston seal

7) Spring

23)

Name plate

37) Friction plate

53)

Valve body

8) Stop spring

24)

Rivet

38) Spacer

54)

Washer

9) O-ring

39) Oil seal

25)

Plug

55)

O-ring

10) O-ring

40) O-ring

26)

Drive shaft

56)

O-ring

11) Parallel pin

41) O-ring

27)

P-type swash

57)

Shim

12) Socket head bolt

plate

42) Parallel pin

58)

Spring

13) O-ring

28) Cylinder block

43) Washer

59)

Piston rod

14) Plug

29) Piston

44) Washer

15) Plug

30) Stopper

45) Ball bearing

4-92

Structure and Function

Model: MAG-170VP-3400E

NOTE: For the location of the travel motor on the machine, see “Hydraulic equipment layout” on

page 4-24.

Ps

Pm1

Tin

1

Dr

P1

A

Pm2

Pp

2

P2

B

ZX215-1002132

Ps:

Duo speed pilot hose port

A. Mounting surface with sprocket

Pm1: Pressure detection port

B. Mounting surface with undercarriage

Pm2: Pressure detection port

1. Mounting hole with sprocket

Tin:

Motor case inner oil port

2. Mounting hole with undercarriage

Pp:

Brake release port

Dr:

Oil drain port

P1:

Main oil port

P2:

Main oil port

NOTE: For more technical information about the travel motor, see “Travel motor” on page 3-7.

4-93

Structure and Function

Connected to sprocket

Mounted on the undercarriage

5

4

2-1

1-4

1-3

Piston motor shaft

1-5

1-6

1-2

1-1

3

2-4

2-3

2-2

2-6

2-5

ZX215-1002093

4-94

Structure and Function

A. Stopped state

Ɣ When the main valve is neutralized (motor

pressure is generated at port P1 and port

stopped), port M1 and port M2 are shut off

P2. The motor is not rotating.

by spool (1) and check valve (2) since no

8-1

8

8-2

Circuit B

Circuit C2

Circuit C1

M1

M2

Orifice D3

Orifice D1

Damper chamber A2

Damper chamber A1

Orifice D4

Orifice D2

Spring chamber 2

Spring chamber 1

P1

P2

6-2

6-1

7-1

7-2

5-1

3

4-1

2-1

1

2-2

4-2

5-2

ZX215-1002094

4-96

Structure and Function

B. When the motor is activated

Ɣ When hydraulic oil from the main pump

damper chamber (A1) via orifice (4-1) and

enters port P1 of the counterbalance valve,

check valve (5-1). The force generated in

spring (3) is pushed to the left by check

this way pushes spring (7-2) on the other

valve (2-1), opening circuit C1. The hy-

side and moves piston (1) to the right. At

draulic oil enters the piston motor via port

this time, return oil from port M2 passes

M, trying to make the motor rotating. At the

through circuit of the notch on the periph-

same time, return oil from the piston motor

ery of piston (1), and through port P2 when

enters the counterbalance via port M2, but

pressure is generated at port M2, and en-

it is stopped by check valve (2-2). The out-

ters the tank via the main valve finally. The

put pressure of the main pump increases

motor is activated at this time.

as a result, and the hydraulic oil works

on the inside of spring chamber (1) and

8-1

8

8-2

Circuit B

Circuit C2

Circuit C1

M1

M2

Orifice D3

Orifice D1

Damper chamber A2

Damper chamber A1

Orifice D4

Orifice D2

Spring chamber 2

Spring chamber 1

P1

P2

6-2

6-1

7-2

7-1

5-1

3

4-1

2-1

1

2-2

4-2

5-2

ZX215-1002095

4-97

Structure and Function

D. Braking of motor

Ɣ The counterbalance valve and the relief

braking force of motor rotation. When the

valve forms the braking circuit. When the

pressure at port M2 reaches the set pres-

main valve is neutralized position, hydrau-

sure of relief valve (8), cone valve (8-1) at

lic oil from the main pump is cut off, and

port M1 overcomes the force of spring (8-

pressure at port P1 and P2 is the same.

2) and moves to the left, and hydraulic oil

As a result, piston (1) moves to the neutral

flows the port M1. In this way, the impact-

position, and the opening area of circuit B

ing force due to inertia at port M2 is under

decreases. At the same time, because of

control, and vacuum at port M1 is avoided.

the inertia of external force, the motor does

not stop rotating (pump effect), and pres-

sure at port M2 rises and serves as the

8-1

8

8-2

Circuit B

Circuit C2

Circuit C1

M2

M1

Orifice D3

Orifice D1

Damper chamber A2

Damper chamber A1

Orifice D4

Orifice D2

Spring chamber 2

Spring chamber 1

P1

P2

6-1

6-2

7-1

7-2

5-1

3

4-1

2-1

1

2-2

4-2

5-2

ZX215-1002096

4-99

Structure and Function

E. Shuttle valve function for high pressure

selection

Ɣ The counterbalance valve can function

ber E to release travel brake. In addition,

as a shuttle valve to release travel brake.

piston (1) moves to neutral position, as

When hydraulic oil is fed to port P1, piston

shown in fig 5 when motor stops. Circuit D

(1) moves to the right, as shown in fig. 4.

is closed and drain circuit F of motor body

At this time, drain circuit F of motor body

is connected. Hydraulic oil in travel brak-

is cut off, and circuit D leading to cylinder

ing cylinder chamber E is conducted to the

chamber E for travel braking is connected.

drain circuit of motor body, and travel brake

Hydraulic oil flows to circuit G via the ori-

is applied.

fice, and enters travel brake cylinder cham-

1

Circuit D

Circuit D

Orifice

Circuit F

Circuit F

Circuit D

Circuit G

Circuit G

Cylinder chamber E

ZX215-1002097

1

Circuit D

Circuit D

Orifice

Circuit F

Circuit F

Circuit D

Circuit G

Circuit G

Cylinder chamber E

ZX215-1002098

4-100

Structure and Function

Operation of parking brake

1) When travel begins

Ɣ As the travel lever is operated, pressurized

oil from the pump activates counterbalance

10

valve spool (10), opens the parking brake

circuit, and flows to chamber A of brake

piston (12). Pressurized oil overcomes the

force of spring (11) and pushes piston (12)

toward the left.

Ɣ Since the pushing force to plate (13) and

disc (14) disappears, plate (13) is sepa-

Travel control valve

rated from disc (14) and the brake is re-

leased.

M

A

11

14

13

12

22

ZX215-1002099

2) When travel stops

Ɣ As the travel lever is placed in neutral,

counterbalance valve spool (10) returns to

10

the neutral position and closes the park-

ing brake circuit. The pressurized oil in

chamber (A) of brake piston (12) passes

through the orifice of the brake piston and

is drained to the motor case. Brake piston

(12) is pushed to the right by spring (12).

Plate (13) and disc (14) are pushed to-

Travel control valve

gether, and the brake is applied. As brake

piston (12) returns, flow of pressurized oil

is reduced with slow return valve (22). The

M

A

time delay will be set to activate the brake

11

14

13

12

22

ZX215-1002100

only after the machine has stopped.

4-101

Structure and Function

Brake valve operation

Ɣ The brake valve consists of suction safety

valve (8A) and counterbalance valve (18).

Travel control valve

Functions and operations of respective

PA

PB

components are described below.

8A

18

MA

MB

ZX215-1002101

1) Counterbalance valve and check valve

Function

Ɣ When the machine is travels downhill, the

weight of the machine tends to make the

Travel control valve

travel speed faster than the motor speed.

PA

PB

If the machine travels with the engine at

8B

low speed, the motor may rotate at zero

8A

load, resulting in run away and inviting a

very dangerous situation. These valves are

used to avoid such a situation by control-

ling the machine to travel as per the engine

speed (pump delivery).

19

MA

MB

Operation when pressurized oil is supplied

ZX215-1002102

Ɣ Operating the travel lever conducts the

pressurized oil from the control valve to

port (PA). The pressurized oil opens suc-

tion safety valve (8A) and then flows to

motor outlet port (MB) via motor inlet port

(MA). The motor outlet side is closed by

suction safety valve (8B) and spool (19),

so the pressure at the supply side rises.

4-102

Structure and Function

Ɣ The pressurized oil on the supply side

flows to chamber (S1) via orifice (E1) and

Travel control valve

orifice (E2) of the spool (19). As the pres-

PA

PB

sure in chamber (S1) goes above the spool

selector pressure, spool (19) is pushed

toward the right. Port (MB) and port (PB)

are connected, the motor outlet port side

opens and the motor starts rotating.

S1

19

MA MB

E1 E2

ZX215-1002103

Operation of brake during downhill travel

Ɣ If the machine goes out of control while

travelling downhill, the motor will be caused

Travel control valve

to rotate without load to decrease the inlet

PA

PB

side oil pressure. Pressure in chamber (S1)

20

is released via orifices (E1) and (E2). As

the pressure in chamber (S1) goes below

the spool selector pressure, spool (19)

is returned to the left by spring (20) and

S1

outlet port (MB) is throttled. The pressure

at the outlet port side rises, generating ro-

tation resistance on the motor to prevent

19

the machine from losing control. On the

other hand, the spool moves to a position

MA MB

where the pressure on outlet port (MB) can

E1

E2

be balanced against the machine's own

ZX215-1002104

weight and the inlet port pressure. Oil flow

from the outlet circuit is reduced to ensure

the travel speed corresponded to the pump

delivery.

4-103

Structure and Function

2) Safety valve

Function

Ɣ When the machine travel is stopped (or it

is travelling downhill), the counterbalance

valve closes the inlet and outlet circuits of

the motor. Since the motor is rotated by

inertial force, pressure in the motor outlet

port side is abnormally increased, poten-

tially resulting in damages on the motor

and piping. The safety valve releases this

abnormal pressure to the inlet port side of

the motor in order to prevent damages to

the equipment.

Operation

Travel control valve

1. When travel is stopped (or when travelling

PA

PB

downhill) (Right swing)

20

Ɣ Reduction of the pressure at motor inlet

(PA) decreases the pressure in chamber

(S1). When it drops beyond the spool

switching pressure, the spool is returned to

S1

the left by spring (20), reducing the pres-

sure at outlet passage (B1). At this time,

the motor continues rotating due to its iner-

tial force, thus pressure on the outlet port

MA MB

(MB) is increased.

A1

B1

ZX215-1002105

Ɣ When the pressure rises above the set

pressure of the suction safety valve (8A),

the poppet opens. The pressurized oil

passes through notch (A1) of spool (19)

into chamber (MA) of the circuit at the op-

posite side.

Spool MB

MA

ZX215-1002107

4-104

Structure and Function

2.

When starting travel (or when traveling at a

constant speed)

Travel control valve

PA

PB

8B

Ɣ

As the travel lever is operated, the pres-

surized oil from the pump moves spool (19)

8A

toward right. The passage to the suction

safety valve functions as a circuit which

passes through notch (B2) of spool (19),

S1

producing large differential pressure. The

pump pressure rises, providing a large

tractional force to the valve.

19

MA MB

E1

B2

ZX215-1002106

3) Relief valve

Ɣ

The structure of the relief valve is shown

in the right figure. This valve is area dif-

ference and direct flow type. It has impact

damping function during starting and brak-

ing.

ZX215-1002108

A. Operation principle and function

Ɣ When the main valve makes the motor

to start or brake, front pressure of cone

2-9-2

2-9-5

valve (2-9-2) rises above the set pressure

and the force of spring (2-9-5), and moves

cone valve (2-9-2) to the right and off the

valve seat. Pressurized oil in the front of

cone valve (2-9-2) is bypassed to the low

pressure side. The impact due to inertia

energy at the high pressure side is put un-

2-9-3

der control and vacuum is prevented from

ZX215-1002109

occurring at the low pressure side through

bypassing pressurized oil to the low pres-

sure side.

4-105

Structure and Function

B. Damping function

Ɣ When the relief valve begins to function,

damping piston (2-9-9) moves to the left.

2-9-2

Area S2

2-9-5

As a result, low pressure is maintained in

spring chamber D. At this time, the loaded

area of cone valve (2-9-2) is S1, and it is

much larger than the normal set loaded

area S1-S2 of the relief valve. So, when

damping piston (2-9-9) is moving, the func-

tional pressure of relief valve is maintained

2-9-3

Area S1

2-9-9

Spring chamber D

at 1/3 of normal set pressure in order to

ZX215-1002110

absorb the impact at the high pressure

circuit side due to inertia energy. When

the movement of damping piston stops,

pressure in spring chamber D rises. Pres-

sure at both side of cone valve (2-9-2) is

the same, and the relief valve is working at

normal set pressure. In this way, the relief

valve reduces the impact during motor start

and brake by a two-stage action to provide

excellent performance.

Damping method

Time

ZX215-1002111

4-106

Structure and Function

4.6.7 Valve control system

8

9

7

6

1

2

4

10

3

5

5

6

7

9

12

11

8

10

13

4

3

2

11

1

12

ZX215-1002112

4-107

Structure and Function

4.6.8 Pilot valve

4.6.8.1 Work equipment and swing pilot valve

P3

P2

A

T

P

P1

P4

A

64~73.5Nm

19~22Nm

ZX215-1002113

P:

From pilot pump relief valve

P1:

L.H. Pilot valve: Arm OUT

R.H. Pilot valve: Boom DOWN

P2:

L.H. Pilot valve: Arm IN

R.H. Pilot valve: Boom UP

P3:

L.H. Pilot valve: Swing LEFT

R.H Pilot valve: Bucket DIG

P4:

L.H. Pilot valve: Swing RIGHT

R.H. Pilot valve: Bucket DUMP

T:

To tank

4-109

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