Gear zero Backlash system solution

Gear zero Backlash system solution

Backlash, sometimes called lost motion or play, is the gap or clearance between two workpieces when they are combined. Here it refers to a clearance between meshed gear teeth. Gear backlash is required to keep gears meshing without getting stuck and to provide enough space for lubricating and thermo expansion. Backlash is reserved to prevent overheating and teeth damage, and to ensure the smooth operation of a gear set or gearboxes. The existence of backlash is also helpful to the assembly and maintenance of a gear set or gearbox, to prolong the service life. Besides, this gap is essential to absorb the gear machining error and the gear deformation under loading.

In practice, when a gearbox or a speed reducer reciprocates back and forth, the backlash effect will accumulate with the increase of the running distance. Such mechanical play causes significant lost motion between speed reducer input and output shafts, making it difficult to achieve accurate positioning in some applications such as precision inspection instruments, machine tools, robotics and other equipment. For these applications that require special accuracy, it is necessary to increase the precision in gear design, machining and assembly, or to use special types of non-traditional gear drive speed reducers. This speed reducer unit can achieve very low or zero backlash and is suitable for applications where performance outweighs cost.

Backlash is commonly measured in arc minute (arcmin) or arc second (arcsec). 1 arc minute = 1/60 of one degree = 0.0167 degree. Taking the planetary gearbox as an example, the backlash can be divided into ≦1arcmin, ≦3 arcmin, ≦5 arcmin, ≦7 arcmin. There is no international standard to follow for the test method for a gearbox or a speed reducer backlash. Backlash is one of the important index data to measure the performance of gearboxes or speed reducers. The smaller the backlash, the higher the precision and the higher the relative price. Therefore, controlling and reducing the backlash of the gearbox or speed reducer is a serious issue of the manufacturers.

How to get a zero backlash gear

There are several ways in which it is possible to provide a gearbox with zero backlash, thus enabling high precision motion control.

his pinion shaft consists of a gear pair and a tensioning unit. By adjusting the distance between the gears, a tooth flank offset is created, which eliminates backlash and causes tension between the pinion and the rack. The eliminated backlash increases positioning accuracy and reduces vibrations during reversal movements along the rack path – a decisive advantage in applications with high demands on accuracy and smooth operation.

zero backlash gear   Shaft

You can choose us to solve this problem for you with   zero backlash gear

Case-hardened       

material                    : Made of special alloy steel material with wear resistance     

ground teeth            : helical, left hand,  

helix angle                : 19° 31·42

pressure angle          ：20°

toothing quality        :   DIN 4-5

module                     :   MX5- 5-6 & 8

Function description

Tensioning pinion shafts consist of a drive shaft, an oblique toothed gear pair, and a tensioning unit. The gear pair is manufactured with an axial distance of s = 2 mm (m = 5...8).

By reducing this distance (axial displacement of the outer wheel) between the gears, the backlash during the engagement with the rack is reduced or the pre-tension is initiated. A defined pre-tension moment can be generated between the rack and the gear pair via the pre-tension unit.

Max. pre-load torque Tv max.   Disc spring layers

5                           325 Nm          double   3 graduation marks

6                           487 Nm          double   5 graduation marks

8                           550 Nm          double   3   graduation marks

8                          1050 Nm         double   6   graduation marks

Note:  

Stronger pre-load is obtainable by means of multiple spring layers, but then Tv max.   has to be smaller. Disc springs can also be ordered separately.  

If necessary, please Contact Us info@andrizds.de

Order number: MSX M module LZ helical straight teeth LH tooth number axis diameter H35/H48/H50-S non-standard

Example: MSX-M6-LZ-16-H48/50

Module          number of teeth    face width        Disc spring layers      No preload force T2 (NM)       Maximum preload load T (NM)                        lock nut                fixing screw

zero backlash gear   Flange gear

Order number:

MFX M module LZ helical straight teeth LH tooth number PCD: A080/A 125/A 140/A 160/A200/A 250-S non-standard

                                                                                                      B080 / B 125 / B140   /   B160

                                                                                                      C080 / C 125 / C145   /   C166

                                                                                                      Straight teeth LH P080/P125/P140/P160

Example: MFX-M6-LZ-16-A125

Module          number of teeth    face width        Disc spring layers      No preload force T2 (NM)       Maximum preload load T (NM)                        lock nut                fixing screw