SU1458633A1 - Gear transmission - Google Patents

Description

The invention relates to mechanical engineering, to gears with variable gear ratio. The purpose of the invention is to improve the reliability of gear transmission is achieved by increasing the rigidity of the kinematic chain. Gear sectors 5 and 6 are installed on the leading and driven shafts 1, 2 with the possibility of simultaneous radial movement in the slots of the bottom

1458633 A1

1458633

3, 4. Sectors 5 of shaft 1 covers ring 7, and sectors 6 of shaft 2 comprise ring 8. Rings 7, 8 have internal teeth for interaction with the corresponding sectors 5, 6 and external teeth for interaction with each other. The teeth of sectors 5, 6 and the internal teeth of the rings 7, 8 may have pointed tops, and sectors 5, 6 - the possibility of limited circumferential elastic displacement. Rings 7, 8 can be

flexible. Torque from shaft 1 to shaft 2 is transmitted along the kinematic chain sector 5 - ring 7 - ring 8 - sector 6. The gear ratio varies by moving sectors 5, 6 in the slots of the disks 3, 4. The use of gears (internal and external) for transmitting torque torque increases the rigidity of the kinematic chain, i.e. accuracy of variation, reliability. 2 hp f-ly, 5 ill.

one

The invention relates to mechanical engineering and can be used in gears with variable gear ratio.

The aim of the invention is to improve the reliability of the gear by increasing the rigidity of the kinematic chain connecting the drive and driven shafts.

FIG. I depicts a gear; in fig. 2 - section A — A in FIG. one; in fig. 3 - toothed sector; in fig. 4 - teeth of the rings with the profile modification; in fig. 5 - embodiment of the rings flexible.

The gear transmission contains parallel drive and driven shafts 1 and 2, on which pairs of discs 3 and 4 with radial grooves are fixed. In the latter, toothed sectors 5 and uniformly around the circumference of shafts 1 and 2 with the possibility of simultaneous radial movement are installed.

• 6. Sectors 5 of the drive shaft 1 are kinematically connected with sectors 6 of the driven shaft 2 by means of gear elements in the form of two respectively covering sectors 5 of shaft 1 and sectors 6 of shaft 2 of rings 7 and 8. Rings 7 and 8 have internal to interact with sectors 5 and 6 and outer teeth for interaction with each other.

A device for simultaneous radial movement of sectors 5 and 6 is made as follows. Shafts 1 and 2 are hollow. Each of the sectors 5 and 6 is fastened with a pair of corresponding disks 3, 4 of the spokes 9 placed in the radial grooves. The ends of the spokes 9 are placed in the cavities of the respective shafts 1 and 2 and the rollers 10 are attached to them. Coaxially the shafts 1 and 2 in their cavities are placed auxiliary shafts .11 and 12 with screw thread of the opposite direction on each of them. On shafts 11, 12 there are pairs of cones 13, 14 with threaded holes for interaction with screw cuts of the opposite direction (in this case, the shaft I). On the 1G shaft (and, respectively, on the same shaft 12)

2

between the cones 13, 14 with the possibility of relative rotation, a thrust washer 15 is installed. The ends of the latter and the working surfaces of the cones 13, 14 form kinematic pairs with rollers 10 of the spokes 9.

5 The preload force at the contact points in these pairs is provided by springs 16. The cones of each pair (on the shaft 11 - the cones 13, 14) are fixed in the circumferential

direction and can move only 10 along the shafts 11, 12. This is ensured

guides 17. Shafts 11, 12 are kinematically connected by a pair of engaging gears 18, 19 with a gear ratio equal to one, and a handwheel'20 is mounted on the shaft 11.

15 Coupling 21 connects the drive shaft 1 with the engine 22. The tooth profiles of sectors 5, 6 are made with a modification in the form of pointed tops (Fig. 4), and sectors 5, 6 are installed with the possibility of an elastic limited displacement (Fig. 3). The tapering of the tips of the teeth can be done by chamfers b, as shown in FIG. 4, or the use of correction. FIG. 3 elastic displacement of the sector is provided by the implementation of its two parts: the axis 23

25 FOR ’attachment of the sector to the spokes 9 and the very toothed sector 24 itself, connected to the axis 23 of the leaf spring 25. In FIG. 5 rings 26, 27 can be made flexible in the radial direction and have additional supports 30 in the form of rollers 28, crimping rings 26, 27 around sectors 29, 30.

The transmission works as follows. The torque from the engine 22 through the coupling 21 is transmitted to the drive shaft 1. Next, due to the sequential engagement of sectors 5 with the ring 7, the moment is transmitted to the ring 8 and from it, due to the sequential engagement with sectors 6, to the known shaft 2.

Gear ratio determined

40 ratio of distances of sectors 5, 6 to

axes of the respective shafts 1, 2. Change

this ratio is produced rotation 1458633

3

handwheel 20. In this case, the shafts 11, 12 rotate relative to the shafts 1, 2. The corresponding cones in pairs (for example, cones 13 and 14) approach (or diverge), affecting the rollers 10 of the spokes 9 and thereby changing the arrangement of the spokes 9, and consequently, the sectors 5, 6 in the grooves of the pairs of disks 3, 4. The movement of the sectors 5, 6 in the grooves of the pairs of disks 3, 4 is produced by an amount multiple of the pitch of the inner teeth of the rings 7, 8. This condition is not necessary with a modified tooth profile (FIG. 4) and securing sectors 5, 6 (fig. 3) elastic in the circumferential direction, since inaccuracies are hooked These are compensated for by sharpening the tips of the teeth and by the elastic displacement of sectors 5, 6. The use of flexible rings 26, 27 (Fig. 5) expands the range of change in gear ratios, since reducing the distance of the sectors 29, 30 to the axes of the respective shafts , 30 with internal teeth of the rings 26, 27 is provided by compression of the rings 26, 27 by rollers 28.

The use of internal and external gearing for the kinematic connection between the shafts 1, 2 increases the rigidity of this connection in comparison, for example.

four

with chain transmission, i.e., increases the accuracy of the variation of the gear ratio, the reliability of the transmission.

five

Claims (2)

<claim-text> Formula of Invention </ claim-text> <ul style = "list-style: none;"> <li> <claim-text> 1. Gear transmission containing parallel drive and driven shafts mounted on them evenly around the circumference with the possibility of simultaneous operation - </ claim-text> </ li> </ ul> <claim-text> Yudialny movement of the gear sectors and kinematically connecting sectors of the drive shaft with the sectors of the driven gear elements, characterized in that, in order to improve reliability, the gear elements 1c are made in the form of two rings covering the sectors of the respective shafts with internal for interacting with the sectors and with external teeth for interaction with each other. </ claim-text> <ul style = "list-style: none;"> <li> <claim-text> 2. Gear-transfer according to claim 1, in case of - </ claim-text> </ li> </ ul> <claim-text> 20 due to the fact that, the profiles of the teeth of the sectors and the internal teeth of the rings are made with pointed tops, and the sectors are installed with the possibility of an elastic limited circumferential displacement. </ claim-text> <claim-text> 25 3. Gearing on π. 1, characterized in that the rings are flexible in the radial direction. </ Claim-text> <claim-text> AA </ claim-text> <claim-text> FIG. 2 </ claim-text> <claim-text> 1458633 </ claim-text>