Self Locking Gear Box
For power transmission, input torque is applied to the worm and it rotates and transmits the torque to the spur gear. As a result the gear rotates. The above picture is showing a single start worm gear train. It is single start as you can see a single thread wraps around the worm. Similarly, two, three and multi start worm gear trains are also possible. Self-locking Worm GearA self-locking worm gear is a type of worm gear that does not allow the interchangeability of the input and output gears.
Self Locking Gear Box Reviews
Worm gear motor with self-locking, ie in the absence of electricity in the motor, the output shaft is not to move, that is self-locking. Gearbox output shaft direction of the motor shaft is arranged vertically, the entire body of the motor output shaft relative to the g`eneral direction of gear motor short, widely adapted to a number of. Locking gear set. Self-locking is caused by normal friction in the gear set in high ratio worm gearing. As a rule of thumb, worm gear ratios over about 30:1 will probably be self-locking. Spur, helical and bevel gears are not usually self-locking. You should not depend on worm gears, even in ratios over 30:1, to be self-locking, especially if safety is affected. Self-locking function of vertical shaft gear reducer and number of transmission stages Apr 24, 2019 The vertical shaft gear reducer plays a role of matching the rotational speed and transmitting torque between the prime mover and the working machine or the actuator, and is a relatively precise machine.
Self Locking Gear Box Kit
As you know, in trains you can interchange the driving gear and the driven gear but the same is not possible for the self-locking type of worm gears. For this type of gear, the worm always acts as a driving gear and the spur gear as a driven gear- vice versa is not possible.
If you try to run it otherwise, it will lock automatically.As a matter of fact, most of the worm gear trains used in industry are of the self-locking type. But you can of course design a non-self- locking type of worm gear. Approximately, if the tangent of the helix angle of the worm gear is less than the coefficient of friction between the worm and the gear, then the worm gear train should be a self-locking type. A more precise governing equation to ensure the self-locking feature of the worm gear train is:f.
Worm gearboxesDue to its mode of operation, a worm gearbox enables high step-down ratios.In worm gearboxes, both shafts intersect in a defined distance (A).This centre-to-centre distance is reflected in the specification of the gearbox size.(Example: S 100 – centre-to-centre distance 100 mm) Low-noise axial-offset gearboxesWorm gearboxes are highly precise and powerful axial-offset gearboxes. The high-performance gearboxes cope with today’s high requirements in every respect. They are quiet-running and insensitive to shocks.
It is not without reason that they are used worldwide, inter alia, in conveying systems. In everyday language, worm gearboxes are also known as Worms. The housing surface on the side 1 and the flange surfaces on the sides 5 and 6 are machined and may be used as mounting surfaces.All flanges always have threaded mounting holes.You have the following available ordering options: Gearbox sizeOrdering optionsThreaded mounting holes are located in the housing surfaces on the gearbox sideThreaded mounting holes are located in the flanges on the gearbox side040-2-100-100-100-100-10061,65, 6The standard version of the mounting / fastening has the order code 1.Please enquire other mounting Options. The installation position is defined by the gearbox side directed downwards during operation and will be indicated by the associated numeral.The gearboxes can be used in all installation positions.The technically most favourable and thus recommended installation position is the installation position 1.
In this position, the worm shaft is horizontal and located at the bottom.Please contact us for consultation if the angle of the gearbox side directed downwards deviates more than 15° from the horizontal position. The performance data and torques listed in the selection tables are only valid if the gearboxes are used in the installation positions 1, 5 or 6.The values must be reduced by 10% if the worm shaft is vertical or located at the top (installation position 3, 4 or 2).
The achievable efficiency depends on rotational speed, torque, installation position, sealing, and lubricant type. Starting EfficiencyThe efficiency is always lower during the starting phase and in the cold operating state since the lubricating film is not formed until the sliding motion has started.Therefore a higher torque is needed.The starting efficiencies listed below are guidance values and valid for run-in gearboxes.These starting efficiencies must be taken into account for the layout.
Number of threadsGear ratio rangeStarting efficiencyPitch183 – 620,30 – 0,403°-3,5°153 – 300,40 – 0,505°-6°226 – 150,56 – 0,6510°-12°413 – 7,50,68 – 0,7519°-23°650,74 – 0,8228°-32°Operating EfficiencyThe tooth flanks of worm gearboxes in the as-delivered condition are not yet fully smoothed.Therefore the gearboxes should berun in with approx. 50% of the nominal data, if possible, before they are operated under load.The efficiencies specified in the performance tables relate to the permissible nominal data and are guidance values for run-in gearboxes with standard sealing that have operating temperature, and an oil viscosity of 460 mm2/s.
Step-up driveDue to the high efficiency of the ATEK worm gear sets it is possible to drive the gearboxes with 4-thread and 6-thread worm shafts also from the worm gear side and thus to generate a stepping-up.The efficiency with a driving worm gear is calculated by the formula: η´ = 2 – (1 / η) Self-lockingThe self-locking is directly related to the efficiency of the gearbox.Please refer to chapter 8.2.11 Self-locking for more Information. If venting is required the gearboxes will be delivered with a vent filter.The vent bores will be equipped with screw plugs for transport.The vent filter will be enclosed as a separate item and must be mounted in the intended position prior to commissioning.An elbow may be required.Please adhere to the operating instructions!The position will be specified in the order documents.Please refer to Figure 8.2.9-1; Installation positions, for the position of the filter.Here, E4, for example, means: Venting on side 4. For optimal running, the tooth space in the gear set is manufactured larger than the tooth.When the direction of rotation is changed, this results in a rotation angle until the counter-rotating tooth flanks contact each other.This rotation angle is called circumferential backlash. Circumferential backlash, measuring methodThe circumferential backlash is measured after the drive shaft (N1) has been fixed.A force of around 2% of the nominal torque is applied to the output shaft (N2) in both rotational directions.A tooth backlash will result between the two final positions. This can be measured as rotation angle and is indicated in minutes of arc arcmin.All ATEK worm gearboxes can be delivered as low-backlash types.The following values can be set with standard gear sets: Ordering optionGear set040 – 125160 -250/0000Standard. Worm gearboxes are self-locking if the gearboxes cannot be driven from the worm gear side.The self-locking is directly related to the efficiency of the gearbox.If self-locking is demanded the corresponding efficiency of the gearbox with driving worm must be below 0.5.If a gearbox must be unconditionally self-locking, or alternatively, unconditionally not self-locking, we ask to contact us for consultation, giving a description of the case of application. Static self-lockingWorm gearboxes are statically self-locking if starting from standstill with driving worm gear is impossible.The self-locking depends on the pitch of the toothing.The angle is 2.5° to 5°.Please enquire this.Vibrations may override / deactivate the self-locking.Therefore a self-locking toothing cannot always take the place of a brake or an anti-reversing device.
Dynamic self-lockingWorm gearboxes are dynamically self-locking if, with rotating gearbox mechanism, continued operation is impossible due to torque action on the worm gear (output side) of the gearbox.The overrun occurring after switching-off depends on the rotating masses on the drive side.Dynamic self-locking is only possible with very large gear ratios in the range of low driving speeds.Please enquire this. LimitsIf driven parts have high mass inertia moments no self-locking must occur during the run-down process.Extremely high load peaks may occur in case of sudden blocking of the gearbox.In such cases, a gearbox with multistart worm should be used whenever possible.Also, if a braking motor or a separate brake is used on the drive side, the braking moment must not be too high, and it must be mitigated by using an additional flywheel mass on the drive side.