H/B series high power speed reducer

Overview

The YFH and YFB series are Yanfeng Group's high-power industrial gear units. YFH is the parallel-shaft (helical) type and YFB the right-angle (bevel-helical) type. Both are described in the catalogue as brand-new hardened tooth-flank gear units with a wide torque range, built on a modular unit-structure design. They can be mounted horizontally (with or without feet) or vertically, and are available with a solid output shaft, a hollow shaft, or a hollow shaft with shrink disk. The exploded view shows a heavy cast housing with bolted housing cover, end covers and shims, helical gear shafts on rolling bearings, input and output shafts with parallel keys, breather cap and lip-type oil seals.

The gears are made of high-strength, high-quality alloy steel that is carburized and quenched. The catalogue lists the resulting advantages as high efficiency, long service life, ability to carry large axial and radial loads, low running noise, high reliability and compact structure. The cover page also highlights a three-layer high-density polymer paint finish that seals out dust and resists heat, premium ball bearings that reduce friction, and precision-ground alloy-steel gears for meshing accuracy.

Units are built with one to four gear stages in frame sizes 1 to 22, with output speeds from 1.7 to 1200 r/min, output torque up to 470,000 N·m and motor powers from 2.52 to 5366 kW. The type designation encodes series (YFH/YFB), number of stages, output shaft design (S solid, H hollow, D hollow with shrink disk), mounting position (H horizontal, M horizontal without feet, V vertical), size, nominal ratio, assembly design (A, B, C, D) and input shaft rotation (CW/CCW).

The selection guide walks through calculating the transmission ratio, checking the nominal power rating against driven-machine, prime-mover, starting and safety factors, checking peak torque, permissible additional radial force and actual ratio, and verifying thermal balance. Horizontal units use dip lubrication; forced lubrication is available on request and is used for vertical units, with thermal capacity tables provided for units without auxiliary cooling, with fan cooling, with cooling coil and with fan plus coil. The worked example in the catalogue is a blast-furnace feed conveyor drive.