Page 128 - Goodyear2011PTCatalog

P O W E R T R A N S M I S S I O N P R O D U C T S G E N E R A L I N F O R M A T I O N
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G E N E R A L I N F O R M A T I O N
G oodyear E ngineered P roducts
M atchmaker ® S ystem
The RMA Engineering Standards IP-20 & IP-22 sets up limits for
matching Classical and Wedge V-belts having polyester cord based
on their lengths and cross-sections. These standards have been
developed to ensure that belts that meet the RMA tolerances will
run together on multiple-belt drives and effectively share the load
that is being transmitted.
V-Belt Permissible Deviation From Nominal Length - Envelope Narrow Profile
Industry Standard
Product Length Range
0˝ to 50˝ – 63⁄64˝ 15mm (.5905˝)
51˝ to 80˝ – 63⁄64˝ 20mm (.7874˝)
81˝ to 100˝ – 63⁄64˝ 25mm (.9842˝)
101˝ to 140˝ – 63⁄64˝ 30mm (1.181˝)
141˝ to 300˝ – 63⁄64˝ 40mm (1.575˝)
301˝ to 400˝ – 63⁄64˝ 50mm (1.968˝)
401˝ to 500˝ 61mm (2.400˝)
Source: RMA 1P-22, 2007
Engineering Standard “Envelope Narrow V-Belts and Sheaves”
Many Goodyear Engineered Products branded V-belts are produced
to meet these standards under the Matchmaker Matching System.
Multiple V-belts will still have different lengths under this system;
however, the elongation of the polyester reinforced V-belts will
allow the belt lengths to normalize once the belts are tensioned. The
Matchmaker System only applies to V-belts with polyester cord;
V-belts with Flexten® cord do not fall into this program. Sets of
multiple Flexten reinforced V-belts have to be specially ordered to
ensure they are within an acceptable length range to each other, or
they can be ordered as one banded HY-T® Torque Team Plus® belt.
As an example, a 5V710 belt has a Matchmaker matching limit of
0.30˝. This means a 5V710 that measures 71.150˝ is considered
matched to one that measures 70.850˝ because the difference in
belt length between the two is 71.150˝ – 70.850˝ = 0.30˝, which
is within the 0.30” matching limit that is called out for in the
Matchmaker System.
MATCHMAKER Belts Classical Lengths Wedge Lengths
• Wedge TLP ™ (3VT, 5VT, 8VT)
• HY-T Wedge (3VX, 3V, 5VX, 5V, & 8V)
• HY-T Plus (A, B, C, & D)
• Torque Flex® (AX, BX, & CX)
• HY-T Torque Team ® (HY-T & HY-T Wedge)
• Torque Team Laminated
0˝–60˝.................... 0.15˝
61˝–144˝. ................ 0.30˝
145˝–240˝. ............. 0.45˝
241˝–360˝............... 0.60˝
361˝–480˝. ............. 0.75˝
481˝ & longer......... 0.90˝
0˝–63˝.................... 0.15˝
64˝–150˝................. 0.30˝
151˝–250˝............... 0.45˝
251˝–375˝............... 0.60˝
376˝ & longer......... 0.75˝
As a fnal note, the best way to optimize the Matchmaker program is
to utilize the “frst in-frst out” method of inventory control. Every
V-belt manufacturer that produces polyester-corded belts bases
their matching principles on the assumption that their inventory
is constantly turning over. This is because an inherent property
of polyester is that it will shrink over time. Thus, a belt built two
years ago will not measure the same as it did when it was originally
produced. How much and how fast the polyester shrinks is largely
dependent on the environmental conditions that the belt is exposed
to during storage. As it is diffcult to easily monitor the environment
of certain storage spaces, it becomes apparent why it is important to
make certain that the oldest inventory is the frst to be used. With
these procedures in place, the Matchmaker System will continue to
serve your multiple-belt drive needs.
Meets RMA Engineering Standards IP-22 for Narrow V-Belts, 2007