Straight or helical shaft gearbox
This gearbox is known by this name because of the type of design in the gear. The design of the gear is such that it has a high stress and pressure tolerance compared to normal gears.
Technical specifications of direct or helical shaft gearbox
A gear is a toothed rotating part that is in contact with another similar part. Gears are one of the most important components of any machine. Two or more gears that are next to each other and in communication with each other are called gearboxes. Gearboxes can increase the output torque by reducing the speed of the gears and determine the direction of rotation of the output shaft.
Helical gear or gearbox
One of the most widely used and common gearboxes in the industry is the direct shaft gearbox with helical gear. A pair of helical gears is shown in the figure below.
Straight or helical shaft gearbox
The reason for the name of this gearbox is its diagonal and helical gears. The difference between the helical gear and the normal gear is the degree of engagement of the two gears. In the helical gear, the amount of contact surface between the gears is more, and this causes more pressure and less noise. Also, the helical gears are made of alloy steel, which increases the ability to withstand pressure. In some helical gearbox models, the brake is used to prevent the gearbox from returning. A pair of meshed helical gears that have the same and opposite helix angles. One gear acts as a driver and the other acts as a moving gear and causes the transfer of rotation and torque from one axle to another. The structure of helical gearboxes is such that power transmission in these gearboxes is done by moving a point along the gear surface. The efficiency of direct shaft gearboxes is high due to the use of helical gears and is usually between 90 and 99%. Direct shaft gearboxes are widely used in the industry due to their advantages.
Helical gearboxes are one of the oldest and most basic industrial gearboxes, which cover the torque range between 50 and 20000 Nm in single-stage and 2- and 3-stage models. These types of gearboxes are divided in terms of conversion ratio variation from 1:30 to 1:289.74, in compound or combined gearboxes the conversion ratio is up to 1:2700. Access to this amount of torque and very high conversion ratio is very difficult in the market and only special gearboxes have these features.
Also, the helical gearbox or direct shaft can supply gearboxes with high output revolutions or gearboxes with low weight. Because helical gearboxes are always high efficiency, they offer a better ratio between torque output and installation space, which means that helical gearboxes are compatible with all conditions.
Types of helical gearbox or straight shaft flanged helical gearbox
Helical gearbox with base and flange
Helical gearbox with outlet pot
Helical gearbox with outlet pot
The output shaft of the helical gearbox is in line with the shaft of the electric motor. The helical gearbox or direct shaft can be coupled with electric motors, servo motors or hydro motors, and even the input speed of the electric motor can be transferred to the gearbox through the coupling, i.e. the shaft input.
Types of direct shaft gearboxes (helical)
Single-stage or multi-stage helical gearbox
Helical gearbox with base or flanged gearbox
Base and flange helical gearbox
Helical gearbox with outlet pot
Helical or direct shaft gearbox brands
SEW brand, Bonfiglioli, etc. are prominent European brands and Rahnama brand, Iran Helical Gearbox, Pars Helical Gearbox, etc. are also reliable brands of Iranian quality gearbox manufacturers.
Helical gearbox components
Helical gearboxes suitable for the required torque and input power consisting of a number of helical or truncated gears, input pinion, output shaft pinion, seals, bearings, a number of spike holders, air valve, gearbox housing or shell, gasket And a number of shims have been formed.
How to choose a helical gearbox
To choose a gearbox, we must first know what the gearbox is for. Then it is the value of the working interval of the gearbox that is important. The amount of power, which is specified in kilowatts or horsepower, as well as the nominal torque of the gearbox, which is specified in newton meters. The output speed of the gearbox or the conversion ratio of the gearbox must be known. Finally, we need to determine how to install the gearbox.
Advantages of direct shaft gearbox
Quiet operation with low noise
High efficiency
Ability to work at high speeds without vibration
Ability to transmit high torque and power
Easy and convenient maintenance
Ability to work at high conversion ratios
Sufficient space for proper lubrication of gears and long life
Repair and maintenance of helical gearbox
If you hear unusual noises and strong vibration of the gearbox, the bearings of the gearbox should be checked and replaced, and if the problem is with the gears, you should contact our experts at Hyper Sanat Famco to replace the mentioned gearbox gears if there are any. do.
Oil leakage can occur from different parts of the gearbox, these causes include gasket failure and gearbox seal leaks.
The non-rotation of the gearbox output shaft when the electric motor is working can be the cause of this failure due to the loss of the gearbox input pinion.
Every 3000 hours or at least every six months, the oil or grease inside the gearbox should be checked.
Every three years, the oil of the gearbox and gear bearings must be changed (of course, small size helical gearboxes and worm gearboxes do not need to change the oil during their operation).
Application of helical gearboxes or direct shaft gearboxes
Helical gearbox (direct shaft gearbox) is one of the most widely used in various industries. Helical gearbox (straight shaft gearbox) with flange for vertical installation such as mixers and stand type are mostly used in material transfer lines. Other uses of this product include the following:
Helical mixer gearbox
Thickener helical gearbox
Helical batching gearbox
Helical gearbox of steel industry
Helical Gearbox of Cement Industries
Helical gearbox for food industry
Helical gearbox for water and sewage industries
Helical gearbox of pharmaceutical industry
Helical gearbox of marine industries
Helical gearbox of tile and ceramic industries
Helical gearbox for packaging industries
Conveyor helical gearbox
