## **Tokyo Hensokuki Co., Ltd. (Tohen) – Company & Product Overview**
**Tokyo Hensokuki Co., Ltd.**, now known as **Tohen**, is a Japanese specialist in developing and manufacturing infinitely variable transmissions (CVTs) and mechanical power units. Since its founding in 1951 (Showa 26), Tohen has focused on mechanical variable speed technology, including oversized and custom gear reducers.
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## **Company Profile**
* **Company Name:** Tohen (formerly Tokyo Hensokuki Co., Ltd.)
* **Founded:** 1951 (Showa 26)
* **Headquarters:** Kawaguchi City, Saitama Prefecture, Japan
* **Capital:** ¥10 million
* **Leadership:** President – Toh Namatsu; Executive Chairman – Kinichi Kaneko
* **Core Business:** Development and production of CVT units, mechanical power units, and large-scale custom gear reducers
* **Specialty:** Mechanical speed-variable drives, from standard CVTs to oversized custom units
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## **Product Portfolio & Models**
### **CVT & Speed Variable Drive Series**
Tohen offers a wide range of mechanical, stepless speed-control drive units used in automation and power transmission systems. Major product lines include:
* **AV Series:** AVZ, AVS — parallel-shaft CVTs
* **AW Series:** AWZ, AWS — geared CVT variants
* **AWD Series:** AWDZ — multi-stage, high-offset variants
* **VS / VW Series:** VS, VW, VWVS, VWVR — vertical or wide-format CVTs
* **VWD Series:** VWD, VWDVS — variation with vane-drum design
* **Other key models:** VWR, VRS, VR, CT, VM, TW, TWV, TWD, TWPVS, TGM, TGMD, TGMV, BRM, RC9H
These models support multiple gear ratios and torque capacities, tailored to diverse automation, processing, and motion control needs.
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## **Technical Highlights & Advantages**
### **Mechanical CVT Expertise**
Tohen has more than 70 years of experience in designing mechanical CVT units. Their drives are compact, reliable, and designed for long service life in precision applications, requiring minimal maintenance.
### **Customization & Oversized Reducers**
Beyond standard units, Tohen also offers large-scale, customized speed reducers for special industrial needs. These systems are engineered for heavy-duty applications with precise torque control and gear ratios.
### **Durability and Modularity**
Tohen products are known for long operating life, smooth operation, low noise, and mechanical resistance. Additional options include safety covers, inverter compatibility, and brake units depending on client requirements.
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## **Application Areas**
Tohen’s CVTs and speed-variable drives are used in a wide range of applications, including:
* Factory automation systems
* Parking tower and mechanical lift systems
* Rotational and tilting structures
* Conveyor drive mechanisms
* Shading and facade movement systems in architecture
* Specialty stage and screen lifting equipment
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## **Summary Table: Key Products**
| Product Series | Example Models | Key Features |
| -------------------- | --------------------- | ----------------------------------------------- |
| AV / AW / AWD Series | AVZ, AWZ, AWDZ | Compact mechanical CVTs with wide speed control |
| VW / VWD Series | VWVS, VWDVS, VWR, VRS | Vertical/offset versions, vane-drum types |
| Specialty Models | TGM, TWV, BRM, RC9H | Large torque, custom ratio options available |
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## **Conclusion**
**Tokyo Hensokuki Co., Ltd. (Tohen)** is a trusted pioneer in Japan's mechanical transmission industry. With a rich history and engineering focus, Tohen delivers reliable and scalable CVT systems tailored to both general and customized industrial applications. From standard AV and VW series to oversized custom reducers, their innovations enable precise speed control, durability, and easy integration in complex mechanical environments.