|
|
 |
 |
 |
|
 |
| |
This article is part of a section of the RcTek site that is devoted to informing the model car owner about the various different aspects of two speed transmissions.
This article covers a wear problem regarding the ball bearing adjusters/actuators used in this type of model car transmission. |
 |
|
 |
|
|
 |
|
|
|
|
|
| Ball Bearing Adjuster/Actuator Wear |
| After some considerable use, due to the amount of gear changes and the vibrations involved with IC (Internal Combustion) model cars, the ball bearing in the hollow adjusters can become trapped. |
| This problem can result in sticking gear changes or, in extreme cases, no gear changes at all. |
|
| In the diagram on the right you can see where the ball bearings (green) are in the two speed assembly. They provide a low resistance, free running contact point between the adapter and the shoes and sit just inside some specially made hollow grub screws (red). |
|
|
|
|
|
|
| As stated above, after a considerable amount of use, the ball bearings can, through pressure and vibration, move upwards and become trapped inside the hollow grub screws. |
| The two diagrams above show the ball bearing/grub screw assembly in greater detail. The one on the left is an example of a new assembly and the one on the right shows just what can happen when the grub screw wears and/or deforms and allows the ball bearing to move up and become trapped. |
|
| I must stress that this is a problem that would take a very long time to manifest itself into a problem that would affect the working of your two speed assembly. There would be some loss of adjustment, but this is not really a problem and this article only serves to warn you of what can happen. |
| Summary |
| You will now hopefully be better informed as to what kind of wear problems occur with the two speed transmission systems used on remote controlled model cars and the effects of such wear. |
| Further Information |
| If you have any comments or suggestions about this or any of the other R/C car content on the RcTek site, please feel free to ask them on our On-line Forum |
|
| Unless stated otherwise all images and content are Copyright (c) RcTek 2000/2001 |
|
