RU98117037A

RU98117037A - SCREW CLOSING

Info

Publication number: RU98117037A
Application number: RU98117037/28A
Authority: RU
Inventors: А.Ф. Кочетков
Original assignee: Ульяновский государственный технический университет
Filing date: 1998-09-11
Publication date: 2000-06-27

Claims

1. Helical gearing, consisting of cylindrical wheels with an oblique external tooth, having mating tooth profiles in the end section — convex at the gear and concave at the wheel, contacting the teeth at some distance from the gearing pole P, called the displacement value l, characterized in that the wheels made of involute cylindrical worms having in the end section the same involute profile of the lateral surfaces of the helical grooves — convex in a small worm — gears and a wheel concave in a larger worm — identical to the profile of the external tooth of the involute cylindrical wheel, outlined by the involutes of the circumference of the main gear cylinder, and which are helical helical gears with a small number of teeth, equal to the number of worms entering, and small values of the tooth inclination angle β, while the engagement angle α _w is equal to the angle of the tooth profile of the initial contour involute gearing α, i.e. α _w = α = 20 ^o , as well as the fact that an engagement field is obtained, formed by the contact line of the conjugated involute profiles of the teeth of the wheels (worms) in the end section in the direction parallel to the axles of the wheels.

2. The helical meshing according to claim 1, characterized in that both wheels (worms) are made with a straight tooth profile (turns) in the end section, while the meshing angle α _w is equal to the angle of the tooth profile of the initial involute meshing circuit α, i.e. α _w = α = 20 ^o .
3. Helical gearing according to claim 2, characterized in that the value of the angle of engagement α _{w is} determined by the expression

where l is the amount of displacement;
m _T - the module of the teeth of the wheels (worms) in the end section;
Z ₂ - the number of teeth of the wheel equal to the number of visits of a larger worm,
which ensured that the pressure angle α _{d was} zero at all points of the contact line of the rectilinear profiles of the teeth of the wheels (turns of the worms) in the end section.