RU97101303A

RU97101303A - VARIABLE SPEED DRIVE

Info

Publication number: RU97101303A
Application number: RU97101303/28A
Authority: RU
Inventors: И.Д. Сизов
Original assignee: И.Д. Сизов
Filing date: 1997-01-30
Publication date: 1999-02-20

Claims

1. A variator comprising a two-stage multi-threaded elasto-friction gear, characterized in that the axles inclined to the axis of the input shaft at an angle equal to half the angle at the vertices of the paired cones mounted on bearings on these axes so that the outermost the generators of one group of cones and the outermost generators of the other group of cones become parallel to the axis of the input shaft, the drive roller is in contact with the internal generators with a rubber rim, transmitting t rotation through another group of cones to the rubber ring of the female rim connected to the output shaft.

2. The variator according to claim 1, comprising a drive roller, characterized in that the hub of the roller on the outside has uniformly arranged obtuse-angled grooves in which the same protrusions of the rubber rim enter the lubricant, this joint is tightly closed on both sides of the roller by rubber films, the angle between the wall of the groove and the radius drawn through its middle, is determined by the formula

where γ is the angle between the groove wall and the radius drawn through its middle;
d is the diameter of the circumference of the middle of the walls of the grooves;
μ is the friction coefficient of the rim with cones;
d _about - the working diameter of the rim;
μ _c - coefficient of friction of the walls of the grooves and protrusions with lubricant;
and the groove angle is approximately 2γ; along the width of the rim, the rubber has a variable elastic slip (variable hardness) proportional to the geometric slip and compensating for it, variable rubber hardness is achieved by manufacturing technology or by gluing rings with different hardness; the working surface of the rim has a conical shape with the smallest diameter in the direction of the greatest hardness of the rubber, i.e. at the bases of paired cones, which provides a significant movement of the rolling pole along the generatrix of the cone in the direction of increasing the gear ratio.

3. The variator according to claims 1 and 2, comprising a female rim connected to the output shaft, characterized in that the rim has a large ring with obtuse grooves on the inside, the angle of the groove is determined by the formula for the drive roller; the grooves of the rubber ring are installed in the grooves on the lubricant with the same angle, these joints are tightly closed on both sides with rubber films to prevent the lubricant from getting into the contact spots of the ring with the cones; the rubber ring has a variable elastic slip (variable hardness) in width, proportional to the geometric slip at the calculated moment; the inner working surface of the ring has a conical shape with a minimum diameter on the side of the base of the cones in the soft rubber zone, this eliminates the opposite sliding friction behind the rolling pole and increases the movement of the rolling pole over the entire width of the rim depending on the transmitted moment; the covering rim determines the maximum design moment on the output shaft, which is expressed by the formula
M = 0.5μQKd ₄ ,
where M is the maximum design torque on the output shaft;
μ is the coefficient of friction in the contact spot of the rubber ring with the cone;
Q is the maximum allowable force of pressing the ring to the cone;
K is the number of contacting cones;
d ₄ - the inner diameter of the rubber ring.