Gear Pump Division - Parker Truck Hydraulics Center · Gear Pump Division Motors, Winch Motors and...

October 28, 2014

Gear Pump Division

Motors, Winch Motors and Two-Speed Motors

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A gear motor is a hydraulic actuator which takes flow from a hydraulic pump and converts it to force and rotary motion in order to do work.

What is a gear motor?

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No, they are similar in construction, but they are not the same.

Is a gear motor the same thing as a gear pump?

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•Motors are bi-rotational • Pumps are run in a single direction • Motors have an external drain • Pumps drain internally

• Motors have like porting • Pump inlet is larger than the outlet

• Motor shaft seals are rated for 125 psi • Pump shaft seals are rated for 15 psi

What are the physical differences between a gear motor and a gear pump?

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Motor Function

From Pump

To Tank

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•Gear motors are considered high speed - low torque • Standard gear motors do not operate smoothly at speeds lower than 400 rpm

•Start-up torque is typically 60-65% of theoretical torque • Running torque is 80-90% of theoretical torque

• The drain line must be connected when downstream pressure exceeds 100 psi

Gear Motor Characteristics

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Highest Torque and Displacement

Lowest Torque and Displacement

Average or Running Torque

Graph of Motor Torque

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Winch Motors

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• Available in the 30/31™, 50/51™ and the 75/76™ series motors

• CAD gear teeth • 13 teeth for the 30/31and 50/51 series • 14 teeth for the 75/76 series

• Increased frequency and smaller amplitude torque ripple

• Can offer up to 75% of theoretical torque at start up • Smooth operation down to 100 rpm

Winch Motor Features

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The Winch Motor design is available in the 30/31,50/51 and 75/76 series motors. The key feature of the Winch Motor is the Computer Assisted Design gear teeth. The standard gear has 10 teeth. WM gears have 13 teeth in 30/31 and 50/51 series and 14 teeth in the 75/76 series. The WM gears have a smaller fluctuation in displacement as they rotate than standard gears, as a result the amplitude of torque ripple the WM gears produce is significantly smaller than that of standard gears. These features translate into start up torque that can reach 75% of theoretical, and smooth reliable operation at speeds down to 100 rpm.

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Standard 76 Gear Winch Motor 76 Gear

Tooth Profile Comparison

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5100

4600

4200 Standard M76 WM 76

Torque Ripple Comparison

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Special Winch Motor Thrust Plates & Ring Seal Parts

•Thrust Plate - 391 2185 059 •Thrust Plate Seals - standard pocket seals (6 per thrust plate) •Ring Seals - 391 2585 024

WM30/31™

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•Thrust Plate - 391 2185 062 •Thrust Plate Seals - standard pocket seals (6 per thrust plate) •Ring Seals - 391 2585 022

WM50/51™

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•Thrust Plate - 391 2185 053 •Thrust Plate Seals - 391 2885 040 Teflon ring (2 per thrust plate) •Ring Seals - 391 2585 023

WM75/76™

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Integral Bearing Carrier Two-Speed Motors

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•Available in the 30/31 and the 50/51 series motors •Can be set up in Winch Motor configuration •Rated to 3000 psi (207 bar) •75 to 3000 psi (5 to 207 bar) pilot pressure to shift the spool •Can offer up to 83% of theoretical starting torque in the low speed mode* •Smooth operation down to 100 rpm*

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Rear section gears

Front section gears

All Two-Speed Motors are built with the gears “out of phase”.

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900

1100

1300

1500

1700

1900

2100

2300

WM50-1 1/2"

WM50-1 1/2"

WM50-1 1/2"x1 1/2"in phase

Torque in Inch Pounds

Torque Ripple for a Two-Speed Winch Motor with “in phase” Gear Sets

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900

1100

1300

1500

1700

1900

2100

2300

WM50-1 1/2"

WM50-1 1/2"

WM50-1 1/2"x 1 1/2"out of phase

Torque in Inch Pounds

Torque Ripple for a 2-Speed Winch Motor with “out of phase” Gear Sets

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RAISE

M 1

M 2

Shown with spool biased to low speed. Can also be assembled as biased to high speed.

I.B.C. Two-Speed Motor Schematic

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• Primary Work Rotation • Secondary Work Rotation • Counterbalance Rotation • Constant Gear Section • Intermittent Gear Section

I.B.C. Two-Speed Motor Important Terms

Presenter

Presentation Notes

Although most motor applications require both clockwise and counter clockwise rotation, typically the majority of the work is done in only one direction of rotation. This direction is called the primary work rotation. The opposite direction of rotation is used to reset the equipment in position to repeat the work cycle. This direction is called the secondary work rotation. In a winch application the primary work rotation is the “raise” rotation while “lower” would be the secondary work rotation. The Integral Bearing Carrier 2-Speed Motor should not be used in applications that require a counterbalance valve in both directions of rotation. A counterbalance valve can only be mounted to the 2-speed motor on the side of the bearing carrier opposite the 2-speed valving. A left-hand assembly can only have a counterbalance valve mounted on it’s right side, functioning in clockwise rotation. A right-hand assembly can only have a counterbalance valve mounted on the left side, functioning in the counterclockwise rotation. This will be explained more fully ,later in this program. In the high speed spool position, all the incoming oil flows through one gear section. This section is called the constant gear section. The other gear section recirculates oil internally. It is called the intermittent gear section.

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• Primary Work Rotation - Clockwise • Secondary Work Rotation - Counter Clockwise • Counterbalance Rotation - Counter Clockwise (Mount the counterbalance valve (not shown) on the left side only) • Front gear section constant operation • Rear gear section intermittent operation

The 2-speed valve is on the right side of the assembly in this view.

A = Counterbalance and/or Brake release signal port B = Spool shift signal port C = Spring chamber drain port* D = Shaft seal drain port* E = Work port F = Counterbalance work port

B D

C

A F

E

* Drain lines must be connected to tank.

I.B.C. Two-Speed Motor Right Hand Assembly

23 The 2-speed valve is on the left side of the assembly in this view.

• Primary Work Rotation - Counter Clockwise • Secondary Work Rotation - Clockwise • Counterbalance Rotation - Clockwise (Mount the counterbalance valve (not shown) on the right side only) • Rear gear section constant operation • Front gear section intermittent operation

A = Counterbalance and/or Brake release signal port B = Spool shift signal port C = Spring chamber drain port* D = Shaft seal drain port* E = Work port F = Counterbalance work port

B D

C

A F

E

I.B.C. 2-Speed Motor Left Hand Assembly

* Drain lines must be connected to tank.

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Intensified Pressure

System Pressure

Pilot Signal Pressure

Tank Pressure

Vacuum (Cavitation)

Counterbalance Valve Signal Pressure

I.B.C. Two-Speed Motor Color Key

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Clockwise - Left hand Assembly or Counter Clockwise - Right hand Assembly

Pilot Signal

From Pump

To Tank

To Tank

Low Speed

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From Pump

To Tank

To Tank

Pilot Signal Transition

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From Pump

To Tank

To Tank

Pilot Signal High Speed

28 To Tank

To Tank

Counter Clockwise - Left hand Assembly or Clockwise - Right hand Assembly

Pilot Signal

From Pump

Low Speed

29 To Tank

To Tank


Pilot Signal

From Pump

Transition

30

From Pump

To Tank

To Tank


Pilot Signal High Speed

Gear Pump Division - Parker Truck Hydraulics Center · Gear Pump Division Motors, Winch Motors and...

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Transcript of Gear Pump Division - Parker Truck Hydraulics Center · Gear Pump Division Motors, Winch Motors and...