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Variable Speed Drives
Lovejoy offers the most complete line of non-enclosed variable speed belt drives from fractional through 30 horsepower. Each component is made with the quality and reliability that Lovejoy builds into all of its power transmission products.
Features and Benefits
• Very economical and reliable method of speed change
• Allows the user to find the ideal
speed without changing sheaves and belts
• Can be used as a highly efficient belt tensioner, with no adjustment necessary
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• Offers a form of "soft-start," eliminating belt slip and premature wear on belt drives with
inherent high torque start-up requirements
Applications That Best Fit Variable Speed Drives
• Conveyors
• Mixers
• Printing Equipment
• Packaging Machines
• Agricultural Machinery
• Pumps
Styles Available
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Econoline Series
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The Econoline Pulley series provides reliable variable speed service with a proven design at an economical cost. Consisting of a wide selection of models, the Econoline series is ideal for both adjustable and fixed center drives using classic "A" and "B" (or 4L and 5L) section drive belts. This series also offers: driven speed ratios from 1.6 to 1 up to 2.7 to 1 and horsepower ranges from fractional through 5 HP @ 1,750 RPM motor speed.
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Aluminoline Series
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Aluminoline Variable Speed pulleys offer the best possible belt alignment with the least amount of overhung load. Used with "A" and "B" drive belts, these pulleys not only have anodized aluminum flanges which provide quiet operation with minimum vibration, but are rated for 1/3 through 1½ HP motors. These two-sided movable pulleys offer greater speed ratios (up to 2.75 to 1).
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WB Series
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Pulleys in the WB series use wide variable speed belts for the most transmission of torque through the widest possible speed range.
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HI-Ratio Series
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Hi-Ratio drives provide the unique combination of broader driven speed ranges and lowest possible minimum drive speed.
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Hexadrive Series
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Hexadrive Series pulleys are the most durable variable speed pulleys available. The hexagon-shaped center shaft efficiently transmits torque through the six hex flats for top performance and long life. The surface of the shaft is covered with a resilient elastomer, which means there is no metal-to-metal contact on any sliding surface and lubrication is not necessary.
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Adjusta-Sheave Series
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The Lovejoy Adjusta-Sheave can be a cost-saving alternative to a spring-loaded pulley when speed change is infrequent.
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Adjustable Motor Bases
It is necessary to change the distance between the motor and driven shaft in order to change speed with an adjustable center drive. The best way to do this is with an adjustable motor base. Lovejoy offers four basic types of motor bases to satisfy requirements of space, convenience, interchangeability, motor frame size, and economy.
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Styles Available
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Sliding "SMB" Type
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SMB motor bases are extremely low profile and made of strong, lightweight steel, plated for protection against rust and corrosion. A folding knurled adjusting handle replaces the common round hand wheel to offer easy speed adjustment with minimum effort and no tools. Adjustable maximum and minimum speed stops are included. The adjusting handle is easily removed for the addition of a sprocket or U-Joint to adapt to existing control methods. There are three sizes available to fit NEMA motor frames from fractional through 15 horsepower. Simple installation is provided by a one-piece motor mounting plate. The best possible belt alignment is maintained because the motor shaft remains perpendicular to the plane of adjustment. This type is slotted for standard NEMA motor frame mounting, but can be drilled for special mounting sizes to offer flexibility of design.
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Sliding Cast Iron Type
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The original Lovejoy design, made of durable cast iron and steel features independent, slotted motor mounting rails to offer greater flexibility of design, as they can be used to mount NEMA motor frames as well as IEC motors and other products (gearmotors, gear reducers, etc.). Models are available to accommodate motors from fraction through 30 horsepower and adjustable maximum and minimum speed stops are included.
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Sliding Dovetail Type
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The Sliding Dove Tail types are the most compact, lowest price sliding motor base offered by Lovejoy. These feature easy motor mounting and speed adjustment due to the one-piece top plate, which is slotted for NEMA 48 and 56 motor frames. The Sliding Dovetail types are so cost effective they can be used as belt tensioning bases. They are also exceptionally durable and made from tough steel construction.
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Tilting Type
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The Tilting Types are economical bases featuring pivotal rather than sliding movement. They are designed for use with NEMA 48 and 56 motor frames. Less space is required to move the motor through the entire speed range because of the use of tilting motor rails. These types can also be mounted in any position for added versatility.
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Companion Sheaves
Lovejoy companion sheaves are made of durable cast iron to assure best possible wear at the belt contact area. Grooved sheaves, for use with V-V adjustable center drives, are machined to match the belt width and angle of standard variable speed belts for optimum efficiency. The spoke design provides strength and light weight. All companion sheaves are precision balanced for smooth running.
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Variable Speed Belts
Lovejoy variable speed belts are designed for long life, even tracking, smooth running, and efficient transmission of power through wide speed ranges. They are made of special synthetic compounds to provide maximum service in conditions where oil, heat (up to 200 degrees F), and static are present. Maximum recommended belt speed is 5,600 feet per minute.
Download Variable Speed Pulley Catalog
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