| 摘要 |
A seat slide device for a vehicle includes a lower rail fixed on the floor of the vehicle, and an upper rail slidably supported on the lower rail through intermediately located members such as rollers and balls. The upper rail has a horizontal portion possessing an outer face adapted to be connected with a seat cushion frame and an inner face contacting the intermediately located members. The horizontal portion of the upper rail possesses a stepped portion dividing the horizontal portion of the upper rail into a connection portion adapted to be connected to the seat cushion frame and a contact portion which contacts the intermediate members. By dividing the horizontal portion of the upper rails into the connection portion and the contact portion, possible adverse affects associated with distortion resulting from welding the upper rail to the cushion frame is significantly reduced and preferably avoided. The seat slide device also provides smooth rolling of the rollers and the balls, and undesirable sliding force increase or large engagement play of the seat slide device is avoided. It is also possible to directly weld the upper rail and the cushion frame, and the number of required parts and the height of the seat device can be reduced. Also, the welding process is made easier by providing a space between the cushion frame and the slide portion of the upper rail.
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