syana22
Pridružen/-a: 16.02. 2021, 19:14
Prispevkov: 4
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 Objavljeno: 16 Feb 2021 19:31 Naslov sporočila: Maintenance of electrical appliances |
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The gearbox is one of the coolest parts of a washing machine. If you rotate the pulley in the gearbox in one direction, the inner shaft rotates slowly back and forth, reversing its direction roughly every half a turn. If you rotate the pulley the other way, the rim rotates at high speed, and the trough rotates completely with it.
Gearbox movement mechanism
Here you can see a gear with a link attached to it. This link is exactly like a link attached to an old steam train wheel - as the gear turns (along with the linkage), pushing another piece of gear in a circular shape back and forth. This pancake gear drives a small gear on the inner shaft, leading to the slide. In addition to rotating the inner shaft in alternating directions, there are other gears within the system that provide gear reduction to slow rotation. Since the motor spins only one speed, which is the spin cycle speed, reducing the gears is necessary to facilitate a slower wash cycle.
صيانة توشيبا
Speed reduction
When the washer enters the spin cycle, the entire mechanism locks up, causing everything to spin at the same speed as the input, which is attached to the motor. The interesting thing here is that when the motor rotates the gearbox in one direction, the impeller works, and when it rotates in the other direction, the whole machine shuts off. How do you do this?
In the figure above, note the bevel gear gear. There is also a smaller gear with slanted teeth behind the large gear in front. These are the only two gears with bevel teeth. Depending on the way the gear rotates, the angle to the teeth will tend to force the inner gear to slide either to the left or to the right inside the gearbox. If it slips to the left, it triggers a mechanism that locks the gearbox.
Gearbox locking mechanism
You can see a small incision in the outer shaft. This notch is hollow, and is attached to the shaft by a small helical gear. When the pinion moves, it drives this outer shaft with it, and the pinion occupies the single tooth fixed by the locking mechanism. When the gearbox is closed, the inner shaft, which drives the impeller, and the outer shaft, which drives the trough, rotates at the same speed as the input pulley. |
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