Parts for two-wheeled vehicles

Two-wheeled vehicle parts in accordance with the present invention includes: a first cover having a functional element therein and having a cross-section of a shape to cover the functional element, a second cover corresponding to the first cover so that an end surface of the second cover can be engaged with that of the first cover, and having a cross-section of a shape to cover the functional element, and a projection formed on either the end surface of the first cover or that of the second cover. The first cover and the second cover have respective end surfaces connected with each other through the projection by ultrasonic welding.

1. A method of manufacturing parts for a two-wheeled vehicle for connecting a first cover and a second cover constituting the two-wheeled vehicle parts containing a crystal oscillator, comprising the steps of:

forming a projection on one of an end surface of said first cover and an end surface of said second cover corresponding to the end surface of said first cover;

mounting the crystal oscillator having a predetermined frequency of natural oscillation on one of the covers,

pressing the end surface of said first cover and the end surface of said second cover through said projection; and

providing an oscillation less than the predetermined frequency to at least one of said first cover and said second cover, so as to connect said first cover and said second cover to each other without damaging the crystal oscillator.

2. The manufacturing method of claim 1, wherein

said first cover and said second cover are connected by welding through said projection by ultrasonic welding in said connecting step.

3. The method of claim 1 including the step of mounting the crystal oscillator on the first cover without the use of adhesives and providing the oscillation to the second cover.

4. The method assembling a bicycle having a first cover and a second cover joined to form a chamber, and a crystal oscillator in said chamber the steps of:

forming a projection on an end surface of one of the first cover or second cover;

mounting a crystal oscillator having a predetermined frequency of oscillation on said first cover;

pressing the end surface of the first cover against the end surface of the second cover;

providing an oscillation to the second cover at a frequency less than said predetermined frequency so as to connect the first cover and the second cover to each other, without damaging the crystal oscillator.

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