Gearheads Technology − short and to the point
Gearhead When performance is required at high torque levels and correspondingly low speeds, maxon precision gearheads are in their element. The output speed decreases in accordance with the gearhead reduction, while the output torque increases. To deter- mine this accurately, the efficiency of the system must be considered.
Program
Conversion The conversion of the speed and torque of the gearhead output (n L , M L ) to the motor shaft (n mot , M mot ) follows the equations below: n mot = i · n L Legend: M L M mot = i · ɳ
– GPX/GP (planetary gearhead) – KD (Koaxdrive) – GSW (strain wave gearhead)
i: Gearhead reduction η : Gearhead efficiency
Gearhead selection For the selection of the gearhead, the maxi- mum transmittable power – the product of speed and torque – is decisive. It should be noted that the transmittable power depends on the number of gear stages. The load torque should be below the nomi- nal torque (maximum continuous torque) of the gearhead M N,G .
Once the gearhead has been selected, the data converted back to the motor axis ( n mot , M mot ) are used for motor selection. The maxon modular system defines the appropriate motor-gearhead combinations.
For short-term loads, the gearhead’s short- term torque must also be considered. The input speed of the gearhead n max,G should not be exceeded, if possible. Therefore, at a given operating speed, the maximum achievable reduction ratio i max is limited. For selecting the gear reduction i, the following thus applies:
n max,G
M N,G ≥ M L
i ≤ i max =
n L
Temperature/lubrication maxon gearheads come pre-lubricated for their entire service life. The lubricants used are particularly effective within the recom- mended temperature range. For higher or lower operating temperatures, we provide recommendations for special lubricants. Service life In continuous operation at maximum per- missible load and maximum recommended input speed, the gearheads typically achieve 1,000 to 3,000 operating hours. If these limit values are not exceeded, the
service life is significantly extended. Operating below the speed limit allows the gearhead to handle higher torques without compromising its service life. Conversely, higher speeds and correspondingly higher reductions can be chosen when operating below the torque limits. Factors that influence the service life: – Exceeding the maximum torques can lead to increased wear and tear – Local temperature peaks in the area where the gear teeth mesh can destroy the lubricant
– Massively exceeding the gearhead input speed reduces the service life – Radial and axial loads on the bearings
1 Output shaft 2 Mounting flange 3 Output shaft bearing 4 Axial support 5 Gearhead intermediate plate 6 Gear wheel 7 Planetary wheel 8 Sun wheel 9 Planetary carrier 10 Ring gear
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