HANGZHOU PERPETUAL MACHINERY & EQUIPMENT CO,. LTD

Specializing in manufacturing gears and sprockets!

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Classification of closed gear transmission
- Jan 01, 2018 -

The gear transmission is divided into three kinds, that is, the open, the half open and the closed. The gear transmission used for automobiles, machine tools, aero engines and so on is all installed in the box body (casing) which is processed accurately and tightly closed, which is called closed gear transmission (Gearbox). Compared with open or semi open, it has the best conditions for lubrication and protection, and it is used in important occasions.

HANGZHOU PERPETUAL MACHINERY & EQUIPMENT CO, LTD, is a professional power transmission company, mainly producing a chain, a pinion, a gear, a bearing ...


The company was founded in 2000, with the name of PLW and Industrial Corporation, as part of our market growth, we now have our trademark "PLW".


HANGZHOU PERPETUAL MACHINERY & EQUIPMENT CO., LTD, is mainly in the manufacture of standard roller chains, stainless steel chains, high quality agricultural chain, conveyor chains, special chains and sprockets etc. Standard products can be manufactured according to ANSI, BS, DIN, KANA. We improve every day that passes. We look forward to pictures and samples of all customers. We can discuss the development and research of the non-standard product.


We have many professional engineers and professional designs provided by SOLIDWORK, AUTOCAD. If you have any questions about the selection, design and application of the production, do not hesitate to contact us, we will provide the most professional and efficient service possible.


Our company is developing rapidly in the main markets of the world. For this reason, we are committed to producing first-class products. For increased growth, PLW has an advanced enterprise management system that works solely to meet the needs of our customers in order to improve our service and the quality of our products by innovating with our service and our quality.