The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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Wide Variable Speed Belts

1/3 through 15 HP
      Pulleys in the WB series use wide variable speed belts for the most efficient transmission of torque through the widest possible speed range. These pulleys are two-side moveable for the best possible belt alignment when used with a grooved companion sheave. However, the location of the belt centerline close to the bore end of the pulley reduces the overhung load on motor bearings and seals. Precision-calibrated springs maintain correct pressure, keeping the belt properly tensioned and minimizing belt slip.

      WB pulleys can be used on both adjustable and fixed center drives. They offer maximum service when lubricated through a convenient grease fitting and occasionally run through the speed range.

    Belt Selection

      WB pulleys offer optimum speed ratios because they are used with wide variable speed belts. Pulley flanges are designed to match standard belt angle and width, so each pulley model must be matched to the correct belt to insure full speed range and maximum torque capacity.

    Adjustable Center Drives

      The typical adjustable center drive consists of: the WB pulley mounted on the motor shaft; a grooved companion sheave mounted with a bushing on the driven shaft; an adjustable motor base; and a variable speed belt. A wide range of pulley sizes and horsepower ratings are available from the WB series to fit the system requirements, and Lovejoy offers the correct drive belt, companion sheave, bushing, and motor base to complete the package.

    Fixed Center Drives

      Fixed center, or compound, drives offer greater driven speed ranges in a compact space. A fixed center drive consisting of a WB spring-loaded pulley and an adjustable pulley to match offers the best possible package for “C” mount configurations where zero offset is critical. Zero offset means that the driver and driven units are in line with one another, and the driven pulley is mounted in such a way that the belt rides as close as possible to the driven unit. This reduces overhung load and provides a smoother running drive. Three WB fixed center drive packages are available, from 1/3 through 3 HP.
Unit of Measure

Specifications

Description 

 N/A 303E-7/8-PULLEY

Drive Type

 N/A Adjustable Center - Driver

Belt Size

 N/A 2926V

Ratio

 N/A 3.4:1

Weight

 N/A 21.50 lb

UPC Number

 N/A 18814

Dimensional Data

Bore Diameter 

 N/A 7/8 in

Keyway Size 

 N/A 3/16 x 3/32 in

Overall Width

 N/A 3.680 in

Outside Diameter (Dimension C)

 N/A 10.000 in

Max. Pitch Diameter (Dimension PD)

 N/A 9.700 in

Min. Pitch Diameter (Dimension PD)

 N/A 2.800 in

Overall Length

 N/A 8.750 in

Cubic inches

 N/A 875.00000 in³

Performance Data

Torque Capacity

 N/A 108.00 in·lb

Motor Power at 1,150 rpm

 N/A 2.00 hp

Motor Power at 1,750 rpm

 N/A 3.00 hp

Features

Features 

 N/A
  • Sizes range from 6 to 13 inches in diameter
  • Ratings to 15 HP
  • Made of durable cast iron flanges (if greater than 1 HP)
  • Lightweight, corrosion-resistant anodized aluminum flanges on Models 245 and 260
  • Precision balanced for smooth operation