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Products (Machinery - Industrial parts)

Mitsuboshi Belting: Industrial-use Belts, Continuously Variable Transmission–use Belts


Mitsuboshi Belting is representative of the quality of the conveyor belt manufacturing industry in Japan.

Since it was established in 1919, Mitsuboshi Belting has focused on the development and manufacturing of transmission belts and conveyor belts. Core products today include synthetic resin belts and other synthetic resin products. 
The recently-developed Narromadillo, a continuously variable transmission (CVT)–compatible belt developed for use with motorbikes sold to the South East Asian market, has proven extremely popular. Mitsuboshi Belting has also strengthened its production and sales framework for general use industrial belting, resulting in greatly improved sales in Asia. Performance is expected to continue to improve in the future.


The CVT Belt: Narromadillo

The innovative Narromadillo, developed in 2007, is a completely unique belting product. Conventionally, CVT belts have either been made from rubber or from metal. The Narromadillo, however, was developed as an attempt to bring together the benefits of both types by combining high elasticity, high-temperature resin and flexible rubber. 

This represents the first successful combination of the relevant positive features of resin and rubber to create an ideal hybrid material.

This material boasts high flexibility, and the loss of power transmission from deformation has been reduced by 70%. As a result of this dramatic improvement in durability performance, the long service life of this belting is reported to be double that of conventional rubber belting. It maintains the power transmission efficiency of metallic rubber while reducing costs since there is no need for lubricating oil. It also makes a significant contribution to the improvement of the fuel efficiency of the vehicles in which it is fitted.

Until now, rubber belting was prone to problems related to flexural heat, which has hampered attempts to make belting more compact. This new material, however, has been designed in order to moderate self-heating, and to ensure that it will not heat up even when bent into compact shapes. The new material also clears the problem of weight gain that has been a specific demerit of metallic variable speed belting.

Being able to make the variable speed unit more compact also contributes to significant improvements to in-vehicle restrictions.

The belting can fit into spaces designed for step transmission, meaning that there is no need to change the design according to transmission system.

Of particular note is its compatibility with scooters and snowmobiles. Previously, the large size of the belting was prohibitive, and different designs were required for vehicles with continuously variable transmission and for those with step variable transmission. When using the Narromadillo, however, there is no need to change the design, meaning the realization of more efficient production.

In 2009, the Narromadillo was chosen to be fitted in the newest export model of motorcycle from one of Japan’s leading motorcycle manufacturers. This has contributed in no small part to Mitsuboshi Belting’s impressive performance, discussed above.


Focus on Basic Materials Research

Mitsuboshi Belting’s Techno Research Center conducts basic research on new materials, such as rubber and synthetic resins, as well as development and research on adding value to products.
The Center focuses on improving the functionality and quality of rubber and belting products, which are the core business of Mitsuboshi Belting. It also develops a range of materials intended to promote advancement in multiple industrial fields.
One example is the engineering plastics developed by the Center. These plastics demonstrate outstanding physical and chemical properties, and, of these, Vespel® boasts the best heat resistance and wear resistance of all the high-performance resins currently being mass produced. The continuous use temperature for Vespel is 300°C, with heat resistance during continuous use up to 480°C. The PV limit factor under no lubrication can be anywhere between 20–100 times higher than that of conventional engineering plastic, indicating exception wear resistance.

Since launching its vulcanized rubber waterproofing sheet material for roofs on the Japanese market, it has become recognized as a pioneer in waterproofing sheet materials, developing waterproofing sheet materials for use in construction and civil engineering. This has allowed the company to make important contributions to the betterment of society, and the Techno Research Center is continuing efforts in this field.

At present, the core products manufactured by Mitsuboshi Belting in this business field are waterproofing sheets that provide the optimal balance of flexibility and strength and impermeable sheets with considerably enhanced impact and laceration resistance.

Mitsuboshi Belting also manufactures antibacterial, anti-fungal resin belting with proven outstanding action on pathogenic E. coli O-157, for use by food manufacturers. It is also involved in the development of other materials, designed to be kind to the environment, which do not result in the expulsion of harmful substances. The intention is to see such materials applied widely to products used in all aspects of society. 

In March 2012, Mitsuboshi Belting launching ULTRA e-POWER, a low-energy belt intended for use in generators and air conditioning facilities, improving performance and helping in efforts to respond to increasingly tightening energy supplies.

ULTRA e-POWER demonstrates improved flexibility through the adoption in its design of a double-cog shape, which has also helped to reduce bending loss during power transmission. The use of a new combination of chloroprene rubber has improved distortion resistance and has reduced transmission loss through slip during revolution. These improvements mean that ULTRA e-POWER is twice as energy efficient as conventional products.

Mitsuboshi Belting Giken Co., Ltd., a subsidiary of Mitsuboshi Belting, conducts research and development on production technology. The systems developed here are rolled out to working plants all over the world, allowing them to ensure the smooth production of high-quality goods.

Going forward, Mitsuboshi Belting will continue to work towards ensuring that it can respond to the needs of diverse industrial fields—needs that are certain to change, expand, and diversify in the coming years—by maintaining a strong framework and the highest possible levels of technological capability. Its market-leading products are sure to make further important contributions on a global scale into the future.

May 18, 2012

About the author
Hiromi Jitsukata is a reporter for Japanest NIPPON
(Mitsuboshi Belting., Ltd.)