Patent ID: 6666103
Filing Date: 2003-12-23
Classification: B60K,F16H,Y02T,Y10S,Y10T

Abstract:
A torque transmission device, comprising:a first rotating shaft supporting a first helical gear; a second rotating shaft supporting a second helical gear, the second rotating shaft being disposed parallel to the first rotating shaft; a rotation body comprising a third helical gear which meshes with the first helical gear, and a fourth helical gear which meshes with the second helical gear; an intermediate shaft which supports the rotation body, the intermediate shaft being disposed parallel to the first rotating shaft; and a thrust bearing which supports the rotation body in a direction along the intermediate shaft, the thrust bearing having an average radius R specified by the following equation: R&GreaterEqual;R1&CenterDot;R2(R1+R2&CenterDot;H)&it;2&CenterDot;H&it;{(1+H2)2&CenterDot;H+COS&it;â€ƒ&it;Î¸&it;2}&it;â€ƒ&it;where,&NewLine;&it;H=tan&it;â€ƒ&it;Î²1tan&it;â€ƒ&it;Î²2,R1=pitch circle radius of the third helical gear, R2=pitch circle radius of the fourth helical gear, &bgr;1=spiral angle of the third helical gear, &bgr;2=spiral angle of the fourth helical gear, and &thgr;2=angle subtended by the mesh point of the first helical gear and third helical gear, and the mesh point of the second helical gear and fourth helical gear, with the intermediate shaft as center.