Patent ID: 9517707
Filing Date: 2016-12-13
CPC Classification: B60N,F16C

Claim Text:
1. A seat slide device for a vehicle, comprising: an upper rail made of an aluminum alloy, the upper rail comprising: a lower rail made of an aluminum alloy, the lower rail comprising: a plurality of guide balls each made of a synthetic resin, for supporting movement of the upper rail relative to the lower rail, the plurality of guide balls being arrayed in line without using a cage in a portion between each of the plurality of ball rolling grooves of the upper rail and each of the ball rolling grooves of the lower rail, which are opposed to each other; and at least two high-strength balls each made of a material having a Young's modulus higher than each of the plurality of guide balls, the high-strength balls being disposed such that the plurality of guide balls are sandwiched between said at least two high-strength balls, in an array direction on each of the plurality of ball rolling grooves of the upper rail and the ball rolling grooves of the lower rail.