Hi-Ratio Compound Pulleys: Hi-Lo Manufacturing Company

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High Ratio Compound Pulleys

Hi-Ratio Compound Pulleys for ¼ and ½ hp. drives provide economy and exceptional efficiency at speed ratios up to 7 to 1. Pulley faces are made of highly durable plastic containing special additives to insure long service life.
The pulley itself is comprised of two parts, either of which can be used independently. These are:

No. HR-2 Variable Speed Pulley Assembly which is needle-bearing mounted on a hardened and ground countershaft. It requires a control of some type for operation.
No. HRB-2 Control Base. On the majority of applications, this base eliminates the necessity for a pivoted motor base to maintain proper belt tension.

Operating Principles
The Hi-Ratio Pulley is needle-bearing mounted on a hardened and ground crankshaft. Speed variation is accomplished by moving the countershaft between the driving and driven sheaves. Movement towards the driver (Fig. 1) reduces the driven speed. Movement away from the driver increases the driven speed (Fig. 2)

Please note: Figures in this document should not be used for engineering purposes. They are for reference only. To obtain exact specifications, click on the catalog icon to order catalog HL386.

Produced by the Internet Power Company, Seattle, WA

	Click on the "Top" icon to return to the top of this page.
	High Ratio Compound Pulleys
	Hi-Ratio Compound Pulleys for ¼ and ½ hp. drives provide economy and exceptional efficiency at speed ratios up to 7 to 1. Pulley faces are made of highly durable plastic containing special additives to insure long service life. The pulley itself is comprised of two parts, either of which can be used independently. These are: No. HR-2 Variable Speed Pulley Assembly which is needle-bearing mounted on a hardened and ground countershaft. It requires a control of some type for operation. No. HRB-2 Control Base. On the majority of applications, this base eliminates the necessity for a pivoted motor base to maintain proper belt tension.
	Operating Principles The Hi-Ratio Pulley is needle-bearing mounted on a hardened and ground crankshaft. Speed variation is accomplished by moving the countershaft between the driving and driven sheaves. Movement towards the driver (Fig. 1) reduces the driven speed. Movement away from the driver increases the driven speed (Fig. 2)