RU1772479C - Flat-belt speed-changing mechanism - Google Patents

Abstract

Usage: mechanical engineering, namely mechanical gears, drives of working machines. SUMMARY OF THE INVENTION: A flat-belt variator consists of a driving and driven pulleys, a belt. The driving pulley consists of a shaft 1, the hub of segments 5, the piston 4 and the rod 5 of the trunk, the baffle 8, the elastic spring band 2. The driven pulley consists of a shaft, the hub, trunks, baffle, segments, the elastic spring band. The hubs consist of piston 18 and rod 21 chambers. The shafts have cutouts 19 and 20. The segments consist of a chamber, rollers 16, springs 15, pistons. her 24. 3 ill.

Description

I

-Fsh.2

The invention relates to mechanical engineering, in particular to mechanical gears, drives of the working bodies of machines where a change in angular velocity is necessary.

A variator is known comprising a driving and driven pulleys, a belt and a gear control mechanism, the surface of the pulleys is formed by a number of cylindrical rollers mounted on an axis eccentrically located relative to the corresponding roller, with levers connecting the axes, and segments supported by levers. consisting of two or more elements connected by springs. The disadvantages of the variator are the design complexity and the small range of angular velocity control.

The closest to the invention in terms of technical nature and the achieved result is a flat-belt variator comprising a driving and driven pulleys, radial hydraulic cylinders and a synchronizing device.

The disadvantage of this flat-belt variator is that under the action of an unevenly distributed load, the synchronizing device undergoes bending, which leads to the destruction of the variator.

The purpose of the invention is to increase the reliability of a flat belt variator.

The goal is achieved in that the cylinders of the hydraulic cylinders are made in the form of holes in the hub, and the holes are directed along the chord in the segments, while the synchronizing device is made in the form of a closed elastic band located in the segments directed along the chord of the segments and located in the holes directed along the chord spring-loaded rollers from the outside to the tape.

Figure 1 shows a flat belt variator, a General view; figure 2 is a section aa in figure 1; in Fig.Z is a transverse section of the drive pulley.

The flat-belt variator consists of a shaft 1 of the driving pulley, a spring belt 2, a piston and rod lines 3 and 4, segments 5 mounted on the hub b, a belt 7 covering the driving pulley. The partition 8 is installed between the piston and rod mains 3 and 4 of the drive pulley. The driven pulley of a flat-belt variator consists of a piston and rod lines 9, 10, a baffle 13 between them, an elastic spring band 11, segments 12 of the hub 14, springs 15, rollers 16. The piston and rod of the plane of the shanks - guides 17 are connected to

the hydraulic system using cutouts 19 and 20, through which fluid is supplied to the piston chambers 18 and rod chambers 21. Chambers 22 are made in segments 5 and 12,

which are installed spring tapes 2 and 11. The driven pulley is mounted on the shaft 23.

Flat belt variator works as follows.

When the drive shaft 1 and pulley rotate

0 the movement with a flat belt is transmitted to the driven pulley and shaft. In order to change the gear ratio, it is necessary to change the estimated pulley diameters, with one diameter of the pulleys increasing and the other decreasing. To increase the diameter of the drive pulley, fluid flows through the piston line 3 of the shaft 1 and the cutout 19 into the piston chamber 18 made in the hub 5. From the chamber 18, the fluid enters the piston cavities 17 of the guide shafts. Under fluid pressure, the pistons 24 extend out of the guide shafts 17 and the segments 5 increase the diameter of the guide

5 pulleys. The fluid from the rod chambers of the shank guides 17 through the line 21 and the cutout 20 in the shaft 1 enters the line 4.

Highway 4 is connected to the highway

0 10 driven pulley. The liquid through the line 10, the cutout 20 and the rod line 21 enters the rod cavity of the guide shafts 17. Under the action of the liquid pressure, the pistons 24 of the hub 12 move in

5 toward the center of the pulley and the diameter of the driven pulley is reduced. The fluid from the piston cavity 17 of the guide shafts enters the chamber 18 and through the cutout 19 in the shaft 23 to the line 9.

0 When one of the pulley diameters increases, the elastic spring band 2 or 11 is stretched, as a result of which the spring-loaded rollers 16 located in the chambers 22 move towards the belt tension.

5 When one of the pulley diameters decreases, the elastic spring band that covers the rollers 16 is stretched by the action of the spring 15.

Claims (1)

The claims 0 A flat-belt variator containing a driving and driven pulleys, each consisting of a hub and radial hydraulic cylinders mounted on it, fixed at the ends of the hydraulic cylinder rods of transmitting elements in the form of trapezoidal segments and a synchronizing device, a belt covering pulleys, a hydraulic control device consisting of a source pressure and channels made in the hubs connecting the working cavities of the hydraulic cylinders with the latter, characterized in that. in order to increase reliability, the cylinders of the hydraulic cylinders are made in the form of holes in the hub, the holes directed along the chord are made in the segments, and the synchronizing device is made in the form of a closed elastic band located in the segments directed along the chord of the holes and the holes located in the directed chord of the holes spring-loaded rollers from the outside to the tape. I 9 W fifteen eleven P 2 I'm 22 5 5 Si V