Dwinauto mechanical gear positioning transmission ratio transmission TFT LCD screen offset machine

Date:2022/1/11 9:19:24 / Read: / Source:本站

Dwinauto mechanical gear positioning transmission ratio transmission TFT LCD screen offset machine

The vast majority are mechanical transmissions. They can accommodate most input devices, are inexpensive to purchase and use, are robust, and simple to maintain; finding a reasonable solution for all work environments. For gentle starts with torque limitation requirements, additional equipment (eg hydraulic transmission, slip clutch) is required in some cases. www.dwinauto.com

Working principle: Gears, chains and toothed belt drives work by tooth engagement, and the transmission ratio here only depends on the number of gear teeth. In belts (except toothed belts) and friction wheel transmissions, the circumferential force is transmitted through friction; slip rate can reach 1~3% depending on the load; the transmission ratio is also changed accordingly (but under constant working conditions) down, the motion can still be transmitted evenly). In tooth meshing (eg gears) the pressing force acts mainly in the circumferential direction. In the friction transmission, the two forces are perpendicular to each other, and when the friction coefficient is 4=01, the circular force that can be transmitted by the contact part is only one-tenth of the positive pressure. This is the main reason why friction transmissions can only be used in applications with relatively low power. www.dwinauto.com

gear drive
This is the most widely used transmission type and is suitable for various shaft positions, powers, speeds and transmission ratios. Its advantages are: simple structure, reliable operation, easy maintenance, small size and high efficiency (note the conditions in worm and helical gear drives). Disadvantages: Force is transmitted rigidly, vibration and uneven operation due to meshing error and fluctuation of gear tooth stiffness (for example, causing waviness during cutting), high operating noise (except for worm drive). Therefore, the use of elastic couplings or one-stage belt drives should be considered in advance when possible.
(1) Cylindrical gear transmission, its design and manufacture are the easiest to master.
1) Spur gears are the easiest to manufacture (including chip and chip-free machining), and do not generate axial force, so they are first suitable for occasions with large circumferential force, that is, they are used as large low-speed gear pairs (when the accuracy is high, such as It can also be used in aero-engines up to a peripheral speed of 00m/s), but the noise performance is not good.
2) Circular rotation ratio: The counterwheel starts from the end corner of one of the teeth, gradually enters into engagement, and similarly gradually disengages. The load carrying capacity is also higher than that of spur gears. Disadvantages: there is axial force (so the bearing is more expensive).
3) The axial force in the herringbone wheel disappears (if the wheel or the large gear can move in the axial direction), the tooth width can be increased; a relief groove must be set between the two helical teeth; when the deviation of the left and right teeth are different, it is often Axial flutter occurs. The real herringbone gear (without undercut) can only be processed on a special machine tool (or with a finger-type milling cutter), and it is impossible to grind the teeth in accordance with the principle of combination. In high-speed transmissions, the axial force of the helical gear can be counteracted by means of the thrust ring, where the power loss is significantly lower than in the thrust bearing due to the lower relative speed. When the direction of the force changes, thrust rings are provided on both sides of the pinion. www.dwinauto.com


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