Patent ID: 8689701

Claim:
A wheel truck, comprising: a) a front wheel pair assembly ( 4 ) and a rear wheel pair assembly ( 4 ), each wheel pair assembly ( 4 ) comprising bearing assemblies ( 7 ) on two ends; b) two side frame assemblies ( 1 ), each side frame assembly comprising a square box in the center and journal-box guides on two ends, and the journal-box guides being disposed on the bearing assemblies ( 7 ) via roller bearing adapters ( 6 ); c) two spring suspension devices ( 8 ), the two spring suspension devices ( 8 ) being disposed in the square boxes of the two side frame assemblies, respectively; and d) a bolster assembly ( 2 ) comprising two ends which are disposed in the two spring suspension devices ( 8 ), respectively; wherein: the spring suspension devices ( 8 ) comprise a bearing spring unit ( 8 c ), a damping spring ( 8 b ) disposed on each side of the bearing spring unit ( 8 c ), and a wedge ( 8 a ) disposed on a top of the damping spring ( 8 b ); the wedge ( 8 a ) comprises a primary friction surface ( 8 a 1 ) and a secondary friction surface ( 8 a 2 ); the primary friction surface ( 8 a 1 ) is attached to a column surface ( 1 a ) of the side frame assembly ( 1 ); the secondary friction surface ( 8 a 2 ) is attached to an inclined surface ( 2 a ) of the bolster assembly ( 2 ); the wedge ( 8 a ) is provided with the following structure parameters: α=16-30°, and μ<tgα<μ+μ 1 , in which α represents an included angle between the secondary friction surface ( 8 a 2 ) and a vertical plane, μ represents a friction coefficient of the primary friction surface ( 8 a 1 ), and μ 1 represents a friction coefficient of the secondary friction surface ( 8 a 2 ); and a mechanical property of the damping spring ( 8 b ) meets the following formula: K 1 ×ctgα=K×C/2μ, in which K 1 represents a rigidity of the damping spring ( 8 b ), K represents a total rigidity of the spring suspension device ( 8 ), and C represents a relative friction coefficient of the wheel truck and ranges from 0.05 to 0.15.