SU813036A1 - Flexible link variable-speed drive - Google Patents

Description

The invention relates to a machine ^- building and can be used as power transmission on combines, motorcycles, snowmobiles, etc.

Known V-belt variator, containing two leading conical pulleys and a centrifugal regulator, driven conical pulleys, a load cam clutch and a compensation spring on the driven shaft. With an increase in the speed of the drive shaft, the weights of the centrifugal controller compress the drive conical pulleys, a transition from low gear to higher gear occurs [1],

However, this design of the variator provides only a smooth change in the gear ratio, but does not take into account the ratio of torque from the engine on the drive shaft and the moment of resistance on the driven shaft. Because of this, the variator cannot quickly and accurately establish the optimal ratio depending on the driving conditions.

The closest to the proposed technical essence and the achieved result is a variator with flexible coupling, containing drive and driven shafts, pulleys located on them, at least one of the disks of which is mounted with the possibility of movement along the shaft, a cam load coupling, the coupling half of which is connected with the moving disk [2].

However, this design of the variator does not allow to obtain the automatic action of the variator, since the working surface of the coupling half is made screw with a constant angle of winding.

The purpose of the invention is to obtain 5 automatic 'gear ratio settings.

This goal is achieved by the fact that the working surface of the coupling half. Associated with the moving disk, 0 is described by a square parabola.

Figure 1 shows the variator, a General view; figure 2 - the interaction of the cam load clutch of the drive shaft; in Fig.3 - the interaction of the cam load clutch of the driven shaft.

The variator contains a leading 1 and a driven 2 shafts, on which are located the leading 3 and driven 4 pulleys, 0 consisting respectively of disks

5.6 and 7.8. Disks 5 and 7 are mounted with the possibility of movement along shafts 1 and 2, and disks 6 and 8 are stationary using the stop 9. Pulleys 3 and 4 are covered by a belt 10. A cam load clutch is installed on the drive shaft 1, consisting of a coupling half 11 mounted on the drive shaft 1, 'and the coupling half 12 made integral with the disk 5. A cam load coupling is installed on the driven shaft 2, consisting of a coupling half 13 mounted on the driven shaft 2 and a coupling half integral with the disk 7. surface 15 of the coupling half 11 and 13 is square parabola.

The variator works as follows.

When the drive shaft 1 rotates, the output shaft 2 receives rotation through the belt 10. The axial force produced by the coupling half 12 depends on the torque on the driven shaft .1 and does not depend on the position of the disk 5 on this shaft. The axial force transmitted to the disk 7 depends on both the moment of resistance on the driven shaft 2 and the position of the disk 7 on this shaft, and this position is connected with the gear ratio of the variator. The surface 15 of the coupling halves 11 and 13 is made so that at each point of contact of the cams the equality tg4-i is observed.

where H is the angle between the pressure direction of the coupling half 11 and 13 and the tangent’s point of contact;

- gear ratio from the leading 3 to the driven 4 pulley.

Subject to this equality, the variator automatically sets the gear ratio, numerically equal to the ratio of the resistance moment on the driven shaft to the engine torque on the drive shaft.

Claims (2)

(54) FLEXIBLE VARIATOR 5.6 and 7.8. The disks 5 and 7 are installed with the possibility of movement. Along rollers 1 and 2, and the disks 6 and 8 are fixed, with the help of the stop 9. The pulleys 3 and 4 are covered by the belt 10. On the drive shaft 7 there is a cam load on the clutch, shaft of coupling half 11 fixed on the drive shaft 1 / and coupling half 12, made integral with the disk 5. On the driven 2 shaft, there is a cam-type clutch loaded with coupling half 13 fixed on the driven shaft 2 and coupling half 14, which is integral with the disk 7. The surface 15 of the coupling half 11 and 13 is made on a square parabola. The variator works as follows. When the drive shaft 1 rotates, the rotation receives the driven shaft 2 through the belt 10. The axial force, generated by the coupling half 12, depends on the torque on the driven shaft .1 and does not depend on the position of the disk 5 on this shaft. The axial force transmitted to the disk 7 depends both on the moment of resistance on the follower in lu 2 and on the position of the disk 7 on this shaft, and this position is related to the variator gear ratio. The surface 15 of the half couplings 11 and 13 is made so that at each point of contact of the cams, the equality tg4-l is observed. where H is the angle between the direction of pressure of the coupling half 11 and 13 and the tangent point of the touch; 1 - the gear ratio from the master 3 to the driven 4 pulley. If this equality is observed, the variator automatically sets the gear ratio, numerically equal to the ratio of the resistance moment on the driven shaft to the engine torque on the driving shaft. Claims A flexible coupling variator containing drive and driven shafts, pulleys arranged on them, at least one of the disks of which are mounted for movement along the shaft, a camshaft load coupling, the half coupling of which is associated with a moving disk, characterized in that In order to automatically set the gear ratio, the working surface of the half coupling connected with the moving disk is described by a square parabola. Sources of information taken into account in the examination 1. driving, 1974, № 11, p.21. 2. US patent number 3.006.207, cl. 74-230.17,1961 (prototype). // 7 / Js (rig g (puts