The invention discloses a special gear for sliding door and window. The special gear comprises a circular gear body, and engaging teeth which are uniformly arranged at the peripheral edge of the circular gear body, and is characterized in that the tooth profile of the gear is an involute, the pressure angle is 25-35 degrees, the tip clearance coefficient is 0.001-0.2, the modification coefficient ranges from -0.5 to -0.2, the addendum coefficient is 0.4-0.7 and the tooth height is 2mm-5mm. According to the special gear, a traditional mechanical gear design manner is changed and a traditional gear computational formula is released to obtain an involute gear with the large pressure angle, large modification coefficient and ultra-short-gear involute; the gear strength can be improved without extra heat treatment and the gear can be effectively prevented from being broken. In actual application, when the two gears are engaged, the tolerance gap between the involute and the fitting part of the gears is small and a side clearance is basically not formed.

Special gear for sliding door and window

The utility model discloses an external spline gear and a spline gear transmission device. The teeth of the external spline gear are straight teeth; each tooth comprises an involute gear tooth section and an involute external spline tooth section both of which are connected integrally; the tooth number z2, the modulus m2, the pressure angle alpha2, the modification coefficient X2 and the tooth dedendum coefficient h*f2 of each involute external spline tooth are as same as the tooth number z1, the modulus m1, the pressure angle alpha1, the modification coefficient X1 and the tooth dedendum coefficient h*f1 of each involute gear tooth; the tooth depth coefficient h*a2 of each involute external spline tooth is smaller than the tooth depth coefficient h*a1 of each involute gear tooth. The spline gear transmission device comprises the external spline gear, a transmission gear and a connecting sleeve; the teeth of the external spline gear are straight teeth; each tooth comprises an involute gear tooth section and an involute external spline tooth section both of which are connected integrally; a clamping groove which is far away from the involute gear tooth section is formed in the involute external spline tooth section; the clamping groove is provided with a clamping ring; the clamping ring can support against the inner side of the connecting sleeve. According to the external spline gear and the spline gear transmission device, axial space can be reduced efficiently, and convenience is brought to machining.

Yan Li

Papers

External spline gear and spline gear transmission device