威格士葉片泵，美國(guó)VICKERS葉片泵結(jié)構(gòu)原理
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with the triple pump version. In addition, further reductions in noise levels of an
intrinsically quiet design offer real possibilities in traditional internal gear pump applications.
The highly seizure-resistant surface of the bronze wafer plate is particularly forgiving in cold start-up applications.
Performance Vickers? VMQ pumps meet global SAE and ISO standards. Three single-pump and three thru-drive
sizes are available in 20 displacements, ranging from 10 cm3/r (0.62 in3/r) to 215 cm3/r (13.12 in3/r)
. Four double-pump configurations offer combined displacements from 20 cm3/r (1.23 in3/r) up to 373 cm3/r (22.76 in3/r).
Two triple-pump configurations can combine displacements from 110 cm3/r
(6.71 in3/r) to 463 cm3/r (28.25 in3/r). Continuous outlet pressure ratings reach 293 bar (4250 psi),
with permissible peak pressures up to 310 bar (4500 psi).
Features and Benefits ? Hydraulically balanced design (no internal radial forces) gives almost limitless shaft and bearing life.
? Extremely low noise levels enhance operator comfort.
? Shafts easily handle maximum pressures, ensuring exceptionally long shaft life.
? Unique bi-llic wafer plate allows for cold startups.
Vickers? VMQ pumps provide continuous pressure ratings up to 293 bar (4250 psi) for
the 25 size and displacements up to 463 cm3/r (28.25 in3/r)
the minimum spline engagement should not be less than 85% of the spline pitch diameter to
ensure maximum shaft torque rating. Mounting Dimensions Requirements Dimensional
control requirements of the customer’s mounting pad to which the pump or motor is affixed are as follows.
Pilot Diameter Concentricity of the customer’s female pilot diameter relative to
the effective axis of the female drive must be within 0,
10 mm (0.004 in.) total indicator reading.
The clearance between the male and female pilot diameters must be +0,01 to +0,05 mm (+0.0005 to +0.0020 in.).
Mounting Face The customer’s mounting face to which the pump or motor is affixed must be
square to the axis of the female drive within 0,0381 mm per mm (0.0015 inch per inch).
Shafts Dimensions of keyed shaft receivers must be between +0,003 and +0,03 mm (+0.0001 and +0.0010 in.) of the maximum shaft diameter shown on pages 63 and 64.
? Shaft seal options: single seal design for “dry mount” applications,
? Efficient design means pumps perform under the harshest speed, temperature and cyclical loading conditions.
? Removable cartridges, usually with pump in-line, facilitate maintenance or flow changes.
? Twenty displacements allow selection of the best flow output for optimum use of energy.
? Interchangeable cartridges between single, thru-drive, double and triple pumps,
simplify cartridge selection and reduce inventory.
? High volumetric efficiencies. ? Compatible with a wide variety of fluids.
The latest state-of-the-art Vickers? VMQ fixed displacement vane pumps set new
standards of performance and efficiency for both industrial and mobile applications.
Originally launched in 1995, the new VMQ series features design enhancements in all areas, resulting in a unique
combination of higher pressure capabilities and outstandingly low noise levels.
or double seal design for fluid separation in “wet mount” applications
such as gearboxes or where lubricant is always present. (Wet mount applications extend shaft life.)
Pump Characteristics Minimum Speed Minimum recommended starting speed, under fluid conditions stated above,
is generally 600 r/min. However, the pump size, system characteristics and environmental conditions can raise or lower this speed.
A lower speed can often be achieved after the pump has primed. If low starting or operating
speeds are required, consult your Eaton Hydraulics representative. Rated Pressure
Pumps should not be operated at or near rated pressures at idle speeds for extended periods.
Localized overheating and damage can result. Never assume pumps in a double, triple
or thru-drive pump assembly can be simultaneously loaded to rated pressure.
Shaft loading must be checked for excessive torque.
Drive Alignment Concentricity and angular alignment of shafts are important to pump life.
Misalignment can induce heavy loads on bearings, causing premature failure.
Flexible coupling halves must be aligned according to the coupling manufacturer’s recommendations.
Universal Joints When using double universal joint couplings, the shafts must be parallel and the yokes must be in line.
The offset should be kept as low as possible. Maximum allowable offset will, of course, vary with application conditions.
The pump shaft to universal joint diametral fit should be close (major diameter fit) with no looseness.
Mounting Pad Accessory Drives A splined shaft is recommended on applications where the pump shaft is coupled directly
into a transmission or gearbox. Spline drives should be lubricated.
The possibility of interference between the shaft and transmission splines, due to tolerance stack-up, can exist.
To reduce this possibility, side tooth spline fits should be used.
A side tooth fit and short length of engagement permits more flexibility and less tendency
for side loading than does a major diameter fit spline or long spline engagement. As a general rule,
威格士葉片泵，美國(guó)VICKERS葉片泵結(jié)構(gòu)原理
