Why are two meshing gears made of different face widths?

In summary, the face widths of two meshing gears in an automobile transmission are not always the same, with the pinion often being wider than the gear. This is to ensure that there is no overhang on either side and to allow for full face contact without needing critical adjustments. The main reason for this is to avoid any potential issues or errors.
  • #1
k.udhay
160
10
Hi,

I observe in an automobile transmission that two meshing gears of same material are never of same face widths. Either the driver of driven is a couple or more millimeters wider than the other. Most of the time (not always) the pinion is wider than the gear.

Though I can assume that the pinion is wider for reinforcement purpose, why is it not always the case? Thanks.
 
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  • #2
The face contact ratio must be bigger than one:
iirc: the main reason is just to make sure that one gear is always inside the width of the other ... so there's no overhang on each side to catch on something. Margin for error type of thing.

Checking:
The face widths of pinions are usually wider than face widths of mating gears to insure full face contact
without critical adjustment.
-- http://www.wmberg.com/catalog/pdf/b00k2-16.pdf​
 
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1. Why are two meshing gears made of different face widths?

The face width of a gear refers to the distance across the face of the gear. Two meshing gears are often made with different face widths in order to achieve a desired gear ratio. This means that the gears will rotate at different speeds, allowing for efficient power transmission.

2. How does the face width of a gear affect its performance?

The face width of a gear can affect its performance in several ways. A wider face width can provide greater surface area for the gear teeth to engage with, resulting in a stronger and more durable gear. It can also help distribute the load more evenly across the gear, reducing wear and increasing efficiency.

3. What is the purpose of having different face widths for meshing gears?

The purpose of having different face widths for meshing gears is to achieve a specific gear ratio. This allows for efficient power transmission and can also facilitate the transfer of motion between different components in a machine.

4. Can two gears with the same face width be meshed together?

Yes, two gears with the same face width can be meshed together. However, this may not always be the most efficient option. Having different face widths allows for a wider range of gear ratios to be achieved and can also improve the overall performance and durability of the gears.

5. How are the face widths of meshing gears determined?

The face widths of meshing gears are typically determined based on the desired gear ratio and the torque and speed requirements of the system. Factors such as the material and size of the gears may also be considered in determining the optimal face width for efficient and durable gear performance.

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