hmr regulated motors data and specifications - wainbee · hmr regulated motors data and...

1

HMR Regulated MotorsData and Specifications

SpecificationsHMR 55 HMR 75 HMR 105 HMR 135

cm 3/rev in 3/rev 55 3.36 75 4.57 105 6.40 135 8.23Pressure Ratings Nominal 5000 PSIG Maximum 6090 PSIG Peak 7250 PSIG

Max. Disp.Rated Speed 4000 3700 3300 3000

Min. Disp.Rated Speed 5000 4600 4100 3700

Envelope Size L 9.0 9.5 10.5 11.3 W 8.0 8.2 8.2 10.1 H 9.2 9.8 9.8 10.7Weight 75.0 71.0 73.0 125.0HP Rating Count 107.0 161.0 205.0 241.0

2

HMR Regulated MotorsCounterbalance Valve

Circuit Diagram

B

A´

SA

L G

TN

B´

HMR - 02

EXPLANATIONSA / B Main connection ports (from main control valve)A`/ B ̀ Main connection ports (towards travel motor)S Make up port (optional)G Connection line to pressure regulator

3

Since the counterbalance travel valve (CBV) is of symmetrical design, only one direction oftravel is described here.

Travel forward under load

Oil flow from the travel control valve arriving at port B (see basic design on page 2) travelsto port B´ through logic valve 6. This cuts the connection between chamber B/B´ andbypass B´ when closed. Stroke of its poppet is limited by a stop working pressure passing through check valve 3b, reaching the front end of control spool 2 and forcing this to the right against spring 5, thus connecting bypass A´ with the gallery TN (opening begins atapproximately 8bar, reaching full flow at approximately 40bar). At the same time, travel pressure is available at port G via shuttle valve 9, thus being signaled to the travel motor controller.The return oil in this case flows via bypass A´ to the gallery TN, through the right handcheck valve 8a and can continue to the open connection port A of the control valve.If pressure at TN exceeds 5 bar, the motor gets flushed owing to the preloading check valve10 and its subsequent restrictor 11.

Braking function

Whenever a negative head is generated at B, either because flow is throttled at will for stopping or braking, or in a downhill situation, the make up connection between bypass A´ and TN is blocked. The oil flow to port B that had previously taken place via check valve8b must be restituted at once. This is done through the shortest connection, i.e. from gallery TN via the check valve, and takes place as soon as pressure at A is higher than thatat B. This arrangement avoids the long distance from TN to A via check valve 8a and all the way through swivel and upper carriage.

Description of Function


4

Countering on a machine running out

At full speed and travel pressure higher than 40 bar, the control spool 2 is entirely open;for decelerating it must move from its "fully open" to its "closed" position. The speed ofwhich depends on the dampening effect of a ring gap.

During this closing movement, a countering process can be started. By means of the directional control valve, a pressure signal is sent to port A instead of port B. The pressure rise at A shifts the poppet 6a against the pressure prevailing at port A`; on exceeding the pressure existing at A,̀ the connection of A` to bypass A` is closed. This means that countering can be induced by the operator and will go through as long as pressure at port A is higher than that of the oil flow bleeding from A to bypass A`.

This arrangement makes it possible to design very smoothly decelerating brake valves(long closing time of control spool 2), yet at the same time, to assure controlled positivecountering of the drive. In this instance, control spool 2 keeps the passage to TN closed; drift of the vehicle corresponds to no more than the very low leakage rate at this point.

Additional make up is feasible at port 12 if the above solution proves insufficientto avoid cavitation.

0

0 1 2 3 4 5 6 7 8

10

20

30

40

Range of control

Ope

ning

pre

ssur

e [b

ar]

Stroke [mm]

(∆p

A-B

/B-A

)

Opening pressure/stroke characteristic

Description of Function


5

Circuit Diagram

A

L

B

Vmin Vmax

U

X1

XA

S

1

2

3

5

6 7

Y1

HMR Regulated MotorsPneumatic Maximum Displacement Override

with Counterbalance Valve

4

p X1= 4 ... 8 bar

Connection enabling case to be filled with oil.

Measuring connection, actuating pressure

Drain (filling, vent) ports

Measuring connection, actuating pressure supply

Flow in at port A : Direction of rotation leftFlow in at port B : Direction of rotation right

Vmax - connection (pneumatic)

EXPLANATIONS

A B Working connections SAE

L U

Y1

X1

XA

S Feed into (option)

6

In the unregulated condition, the motor operates at “minimum displacement.” Following theattainment of a set pressure, the motor swings steplessly towards “maximum displacement.” The shuttle valve (1) in the brake valve, which is mounted on the travel motor, connects theregulator (2) to the high-pressure connection with the higher pressure, either A or B. This high-pressure is therefore always signalled to the regulator (2) (see circuit diagram).Through the two non-return valves (3) and (4), the higher pressure of the high-pressure con-nections A and B is likewise selected and delivered to the pressure-reducing valve (5). Thereduced pressure reaches the displacement piston that affects the regulator (2) via channel(6), this being the displacement piston which affects a “minimum displacement position.”The actuating pressure can be measured at connection XA. The second displacement pistonis relieved through channel (7) into the interior of the motor casing.

The start of the feedback control is determined by the pressure setting of the regulator (2),i.e., the pressure at which the motor begins to move towards “minimum displacement.” Assoon as the pilot in the regulator (2) is displaced against the spring force, the actuating pres-sure of the pressure reducing valve (5) enters the channel (7) to the displacement piston,which adjusts the motor to “maximum swash angle.” The regulating point is reached when the other displacement piston is relieved through the channel (6) to the tank, measurable atconnection Y1. Adaptation to the required torque is effected steplessly through changing ofthe swash angle. Functioning of pneumatic Vmax operation

For a variety of applications (deliberate switching off the high-pressure influence in specificdrive operations), it is necessary that the regulating motor can also be set, if required, belowthe start of regulating control to “maximum displacement.” For this purpose, an external pneumatic control pressure (about 4… 8 bar) is connected to the regulator (2) through the connection X1.

Functioning of pressure regulator

Functional Description

HMR - 02P regulating motors are swash-plate axial piston motors with a displacementwhich is variable in relation to the given tractive force requirement for the open circuit.



7

AG

1

2 3

45 6

Basic Design of Rotating Group



1 Shaft

2 Working piston

3 Cylinder barrel

4 Swash plate

5 Valve plate

6 Counterbalance valve

EXPLANATIONS

8

HMR Regulated MotorsElectric Maximum Displacement Override

Electric Brake Pressure Shutoff Purging System

El. Cold power rating P20< 26WM1/M2

M1M2M1

de-energized: connection side A

de-energized: connection side Benergized:} pressure-controlledenergized: acting as fixed displacement

Solenoid switching operations

M1/M2: d.c. solenoid 12 V 12 V

pressure-controlled

motor HMF… - 02(qmax operation).

Circuit Diagram

A

L

U B

M1

M2

qmin qmax

XA

10

Y1

4

5

6

2

1

8

a b

9

3 7

EXPLANATIONS

A

L U Drain (filling, vent) ports Connection enabling case to be filled with oil.

B Working connections SAE

Flow in at port A : Direction of rotation left

Flow in at port B : Direction of rotation right

Measuring connection actuating pressure supply M10x1XA

Measuring connection actuating pressure M14x1.5Y1

9

In the unregulated condition, the motor operates at “minimum displacement.” Following at-tainment of a set pressure, the motor swings steplessly towards “maximum displacement.”

The two main connections of the HMR are designated A and B (see circuit diagram). Twoconnecting channels a and b lead from the main channels A and B to the regulator (2) via the electrically operated 3/2 directional control valve (1). Through the two non-return valves(3) and (4), the higher pressure is selected from the high-pressure connections A and B anddelivered, via the pressure-reducing valve (5), the regulator (2) and channel (6), to the dis-placement piston that effects a “minimum displacement.” The actuating pressure can be measured at connection XA. The second displacement piston is relieved through channel (7) into the interior of the motor casing. The start of the feedback control is determined by the pressure setting of the control valve (2), i.e., the pressure at which the motor begins torotate towards “maximum displacement.”

As soon as the pilot in the regulator (2) is displaced against the spring force, the actuatingpressure of the pressure-reducing valve (5) enters the channel (7) to the displacement piston,which adjusts the motor to “maximum swash angle.” The regulating point is reached when theother displacement piston is relieved through the channel (6) to the tank, measurable at theconnection Y1.Adaptation to the required torque is effected steplessly through changing of the swash angle.

Functioning of electric displacement override

For a variety of applications (deliberate switching off the high-pressure influence in specific drive operations), it is necessary that the regulating motor can also be set, if required, below start of regulating control to “maximum displacement.” For this purpose, the valve (2) is switched electrically with the solenoid M1.



HMR - 02P regulating motors are swash-plate axial piston motors with a displacementthat is variable in relation to the given tractive force requirement, for the closed circuit.

HMR Regulated MotorsElectric Brake Pressure Shutoff

Purging System

10

HMR qmin

HMR qmax

Output torque

selected regulationbegin

regulation end

Self-adjusting displacementcorresponding to the requiredtorque.

Maximum operating pressure p ( bar ) %

min

100

100

100

000

Functioning of electric brake pressure shut-off The electric brake pressure shut-off prevents the return brake pressure from acting on theregulator.The solenoid M2 is operated by selection of the “forward” or “reverse” direction of travel.Depending on whether the solenoid M2 is energized or de-energized, the high pressurecan only pass to the regulator (2) from one high-pressure side, A or B. If pressure is re-versed in the braking operation, the increasing brake pressure cannot affect the regulatorand the motor remains in qmin.

Example: Connection “A” is the admission sideThe oil flow in this channel flows to the hydraulic motor. If the pressure is increased abovebegin of regulation set in the regulator (2) by increasing the tractive resistance in A, then the motor is regulating.During braking, the direction of flow and direction of rotation are maintained, but the higherpressure now occurs in the return side “B.” This, however, has no affect on the regulator. The hydraulic motor remains in the qmin position or returns to this position (exception,electric qmax operation actuated). It brakes at the torque resulting from qmin, which in vehicles, corresponds to a lightly braked coasting behavior.

Diagram Control behavior of the HMR - 02

Str

oke

vo

lum

e q

( c

c. /

rev

) %

Ou

tpu

t to

rqu

e (

Nm

) %



Purging System

11

Linde purging system

The hydraulic motor is equipped with a Linde purging system. This comprises two scavengingsystems: - circuit scavenging - case scavenging

Circuit scavenging

If temperature problems occur (e.g. in the case of high ambient temperature), the temperaturein the closed circuit can be substantially reduced by the scavenging system. The shuttle valve(8) connects the lowpressure side to the discharge valve (9). The purge oil can be cooled then and fed back into the system via a make up circuit (not in motor) to cool the closed loop.

Case scavenging

The heat generated in the rotating group of the hydraulic motor (bearings, linkages, slide faces) can only be discharged from the motor casing through the drained-off leakage. Undercertain unfavorable operating conditions, e.g. high motor speed and low operating pressure,the resulting leakage is not sufficient to dissipate the “frictional heat.”

With the Linde purging system, a quantity of oil flows from the discharge valve (9) at about10 l/min, as a cooling scavenging oil, into the casing of the hydraulic motor and then, after having scavenged the casing, drains off together with the resultant leakage.



Purging System

12

Functioning of the Linde purging system

When both high-pressure lines are without load and have only boost pressure (e.g. when the pump is in the neutral position), the two pistons of the shuttle valve (8) (Fig.1) are in the spring-centered position. Operating fluid is unable to flow to the discharge valve (9) from either the high-pressure connection A or the high-pressure connection B.

However, if high pressure (HP) builds up, for example, on the A side, then this high pressuredisplaces the piston A1, driving the piston B1 towards the low-pressure (LP) connection B(Fig.2). The conical seat (10) on piston A1 acts as a stop, thereby simultaneously preventinghigh-pressure fluid from being transferred out of the spring compartment A1 towards the discharge valve (9).

A

Fig. 1

Outlet

9

8

A1 B1

LP LP

A

Fig. 2 Inlet

9

8

A1 B1

Outlet10

HP LP



Purging System

B

B

13

6

1

32

54

7

Basic Diagram


Purging System

1 Shaft

2 Working piston

3 Cylinder barrel

4 D.C. solenoid M25 D.C. solenoid M1

6 Swash plate

7 Valve plate

EXPLANATIONS

14

B S

L Vmin Vmax

X1

XA

1

2

34

5

6

U

Y1

A

7

Circuit Diagram


Working connections SAE

Port enabling case to be filled with oil.

Gauge port, actuating pressure


Gauge port, actuating pressure supply



Vmax - connection (hydraulic)

EXPLANATIONS

A B

pX1= 20 ... 30 bar

L U

Y1

X1

XA


15

3

4

7

1

2

5

8

9

Basic Design of Control System

from counterbalance valve( shuttle valve 1 )

6


1 Pressure reducing valve2 Pilot (regulator)3 Connection X14 Connecting channel 6 5 Connecting channel 76 Measuring connection, actuating pressure Y17 Displacement piston Vmax8 Displacement piston Vmin9 Swash plate

EXPLANATIONS

16

A

L

B

Vmin Vmax

U

X1

XA

S

1

2

3

5

6

Y1

Circuit Diagram


Working connections SAE

Port enabling case to be filled with oil.

Gauge port, actuating pressure


Gauge port, actuating pressure supply



Vmax-connection (hydraulic)

EXPLANATIONSA B

pX1= 20… 30 bar

L U

Y1

X1

XA


47

17

In the unregulated condition, the motor operates at “minimum displacement.” Following theattainment of a set pressure, the motor swings steplessly towards “maximum displacement.” The shuttle valve (1) in the counterbalance valve that is mounted on the travel motor con-nects the regulator (2) to the high pressure connection with the higher pressure, eitherA or B. This high pressure is therefore always signaled to the regulator (2), see circuit diagram. Through the two non-return valves (3) and (4), the higher pressure of the high-pres-sure connections A and B is likewise selected and delivered to the pressure-reducing valve(5). The reduced pressure reaches the displacement piston that affects the regulator (2), via channel (6), this being the displacement piston which effects a “minimum displacement position.” The actuating pressure can be measured at connection XA. The second displace-ment piston is relieved through channel (7) into the interior of the motor casing.

The start of the feedback control is determined by the pressure setting of the regulator (2),i.e., the pressure at which the motor begins to move towards “minimum displacement.” Assoon as the pilot in the regulator (2) is displaced against the spring force, the actuating pres-sure of the pressure reducing valve (5) enters the channel (7) to the displacement piston,which adjusts the motor to “maximum swash angle.” The regulating point is reached when the other displacement piston is relieved through the channel (6) to the tank, measurable atconnection Y1. Adaptation to the required torque is effected steplessly through changing ofthe swash angle. Functioning of hydraulic Vmax operation

For a variety of applications (deliberate switching off the high-pressure influence in specificdrive operations), it is necessary that the regulating motor can also be set, if required, belowthe start of regulating control to “maximum displacement.” For this purpose, an external hy-draulic control pressure (about 20 – 30 bar) is connected to the regulator (2) through the connection X1.



HMR - 02P regulating motors are swash-plate axial piston motors with a displacementthat is variable in relation to the given tractive force requirement for the open circuit.


18

AG

1

2 3

45 6



1 Shaft2 Working piston

3 Cylinder barrel4 Swash plate5 Valve plate

6 Counterbalance valve

EXPLANATIONS

19

A

XA

qmaxqmin

G Y1

X1

L U

B T

4

1

2 35 6

Circuit Diagram


Flow in at port A : Direction of rotation leftFlow in at port B : Direction of rotation right

Connection enabling case to be filled with oil.

Measuring connection, actuating pressure


Measuring connection, actuating pressure supply M10x1

qmax - connection (pneumatic) M14x1.5

EXPLANATIONS

A B Working connections SAE

px1= 4… 8 bar

L U

Regulator control pressure

Y1

G

T Casing connection

X1

XA

20

In the unregulated condition, the motor operates at “minimum displacement.” Following theattainment of a set pressure, the motor swings steplessly towards “maximum displacement.”

The shuttle valve in the brake valve that is mounted on the travel motor (not supplied byLinde) connects the regulator (1) to the high-pressure connection with the higherpressure, either A or B. This high-pressure is therefore always signalled to the regulator (1) via connection G (see circuit diagram).Through the two non-return valves (2) and (3), the higher pressure of the high-pressure con-nections A and B is likewise selected and delivered to the pressure-reducing valve (4). Thereduced pressure reaches the displacement piston that affects the regulator (1), via channel(5), this being the displacement piston which effects a “minimum displacement position.”The actuating pressure can be measured at connection XA. The second displacement pistonis relieved through channel (6) into the interior of the motor casing.

The start of the feedback control is determined by the pressure setting of the regulator (1),i.e., the pressure at which the motor begins to move towards “minimum displacement.” Assoon as the pilot in the regulator (1) is displaced against the spring force, the actuating pres-sure of the pressure reducing valve (4) enters the channel (6) to the displacement piston,which adjusts the motor to “maximum swash angle.” The regulating point is reached when the other displacement piston is relieved through the channel (5) to the tank, measurable atconnection Y1. Adaptation to the required torque is effected steplessly through changing ofthe swash angle.

Functioning of pneumatic qmax operation

For a variety of applications (deliberate switching off the high-pressure influence in specificdrive operations), it is necessary that the regulating motor can also be set, if required, belowthe start of regulating control to “maximum displacement.” For this purpose, an external pneumatic control pressure (about 4 – 8 bar) is connected to the regulator (1) through the connection X1.



HMR - 02P regulating motors are swash-plate axial piston motors with a displacementthat is variable in relation to the given tractive force requirement for the open circuit.


21

2 3

1

45


1 Shaft2 Working piston3 Cylinder barrel4 Swash plate5 Valve plate

EXPLANATIONS


hmr regulated motors data and specifications - wainbee · hmr regulated motors data and...

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