Drive mechanism for continuously variable transmission

FIELD: machine building.

SUBSTANCE: variator transmission consists of input shaft (18), input disk (10) installed on input shaft and rotating with it and output disk (12) facing input disk and coaxially rotating with it. Input and output disks (10, 12) form a toroid cavity between them. In the toroid cavity there are positioned only two rollers; also the first and the second rotating rollers are arranged on the first and the second roller carriages. Facility (34, 36) of end load holds rollers down to contact with the input and output disks for motion transfer. Two roller carriages are mounted on opposite sides from the axis of lever pivot. Pivot axis of the lever travels in one, preset radial direction relative to rotation axis of input and output disks.

EFFECT: simplified and inexpensive variator.

27 cl, 3 dwg

 

The present invention relates to a device infinitely variable transmission of the type traction roller of a toroidal surface, referred to hereinafter as the variator.

The basic form of the variator includes an input disk with a toroidal groove connected with the input drive shaft and output drive with a toroidal groove made coaxially relative to the input disk. Many videos (usually three roller) is provided in the toroidal cavity formed between the input and output disks and the power is transmitted from the input disk to the output disk via rollers. Rollers fixed in the roller, which are exposed to shear forces (usually by means of a hydraulic piston double-acting). The same hydraulic pressure is usually applied to the so-called chamber of mechanical load for applying axial force to one of the disks, to ensure adhesion of the rollers due to friction with the input and output disks.

Such transmission is mainly intended for use in applications with relatively large capacity, high torques, such as gearboxes of vehicles. Indeed, to allow manipulation of the levels of power and torque and to provide a more SIMM is tricou transmission, it is usually necessary to use a pair of input discs and a pair of coaxially installed output disks forming two toroidal cavities, each of which contains three rollers. One advantage of using three rollers in each toroidal cavity is that such execution is inherently stable in rolling contact at three equally spaced positions around the disk, minimizes the bending components of the variator and, therefore, minimizes wear. However, it is usually also necessary each roller to supply its own control piston double-acting, hydraulic pressure control using a computer.

Although the cost of such complications is acceptable in gearboxes of cars, this precludes the use of variable-speed drives in equipments with lower requirements.

Thus there is a need to create a quick, cheap variator for use in conditions that do not have such requirements.

According to the present invention provide variation transmission containing:

input shaft;

the input disc mounted on the input shaft for rotation together with him;

the output disk facing the input disc and made with the possibility of a coaxial rotation with him, moreover, the input and output disks form a toroidal cavity between them;

two rollers arranged in a toroidal cavity;

first and second means idlers are installed, respectively, the first and second rollers rotatably;

the tool end of the load for pressing the rollers into contact with the input and output discs to transmit movement;

lever means having an axis of rotation, two means of idlers mounted on the lever on opposite sides of the axis of rotation; and

turning means for turning the lever means about the axis of rotation;

in which the axis of rotation of the lever is arranged to move in a radial direction relative to the axis of rotation of the input and output disks.

By providing a variation of the gearbox, with only two rollers, and the control of the rollers with the lever means instead of hydraulic control, you can reduce the complexity and cost of transmission, and to provide a transmission which is suitable for relatively low power applications with a small torque. However, the radial displacement of the axis of rotation of the lever means enables movement of the lever means in a position in which the forces on the rollers matched.

Preferably, the axis of rotation of the lever is fixed in the direction perpendicular by mentioning the fact the radial direction, i.e. moving the axis of rotation limited to the mentioned radial direction.

Lever means, preferably, includes pivot pin, which is made with the possibility of displacement along the slot, which is mentioned in the radial direction. Preferably, the diameter of hinge finger, essentially, is the same as the width of the slot through which the pivot pin is retarded when moving in the longitudinal direction of the slot. Preferably, the axis of rotation is arranged to move a given distance in said radial direction.

Preferably, the hinge means for turning the lever means contains a plot of the shoulder.

Preferably, the hinge means (for example, ball joint) is provided between each means of the roller and lever means.

Preferably, the input shaft and the output disk drive inputs mixed epicycle gear, which is preferably coaxial with respect to the input shaft.

Also means reducing gear may be attached to the exit of the mixed epicycle gear.

Preferably, the tool end load contains elastically deformable means. Preferably, the tool end load contains only elastic deformation or the alignment tool.

Elastically deformable means preferably takes place between the transmission housing and one of the input and output disks.

Elastically deformable means preferably includes a spring, such as spring washer Belleville (Belleville).

Next will be described a specific variant of implementation of the present invention only by way of example, with reference to the accompanying drawings, on which:

Figure 1 is a view in longitudinal section of a variant of implementation of variation transmission in accordance with the present invention;

Figure 2 is a schematic representation of a transmission shown in figure 1; and

Figure 3 is a front view in cross section of a transmission shown in figure 1, when viewed in the direction of the arrows III-III, showing a management tool rollers.

The system continuously variable transmission includes a variator V, with the input disk 10 with a toroidal groove and located opposite the output disk 12 with a toroidal groove. Two rollers 14, 16 are installed in the toroidal cavity formed between opposing surfaces with toroidal undercut the input and output disks 10, 12 for the transmission of motion from the input disk 10 to the output disk 12 with respect, which is variable due to the inclination of the rollers 14, 16.

Input the first disk 10 is connected with the input shaft 18 of the system and rotates with it. The variator V provides output power through the tubular output shaft 20, which is connected with the output disk 12 and is coaxial with the input shaft 18 and around it. Input shaft 18 and output shaft 20 of the variator provide input power for mixed epicycle gear E1. As shown schematically, the end of the output shaft of the variator 20, remote from the output disc 12 carries a first Central gear S1 mixed epicycle gear E1. Drove C1 gears E1 is connected with the input shaft 18 and provides them in motion. Drove C1 carries four identical, evenly spaced internal radial direction of the planetary gears P1 and four identical, evenly spaced outer in the radial direction of the planetary gear P2 (not visible in figure 1) the same size as inside in the radial direction of the planetary gears P1. Interior in the radial direction of the planetary gears P1 engages with the first Central gear S1 and the corresponding one of the four outer in the radial direction of the planetary gears P2. Outer in the radial direction of the planetary gear P2 also engages with the gear A1 with internal gearing supplied inside the teeth, which form in the output power of the mixed epicycle gear E1. Output power from gear A1 with internal gearing is transmitted through a coaxial output shaft 22 in the form of a pipe to a simple downward epicycle kit E2 gears. Epicycle reduction kit E2 gears contains a Central input gear S2, supported by the shaft 22, which is engaged with four spaced at equal angular distances of the planetary gears P3, supported by the planet carrier C2. Planetary gears P3 also engages with the gear A2 with internal gearing, mounted on the transmission housing. The rotation of the carrier C2 generates the output power of the epicycle reduction kit E2 gears and sends out the output shaft 24, which is connected to the planet carrier C2. Output shaft 24 is coaxial with the input shaft 18, one end of which fits into a recess 26 in the inner end of output shaft 24.

Transmission is placed in essentially tubular sump 30 which supports the input and output shafts 18, 20. The end of the crankcase 30 adjacent to the input shaft 18, is closed by end plates 32. Conical spring washer 34 Belleville passes between the inner surface of the end plate 32 and the annular support plate 36, which is in rolling contact with outwardly the flat surface of the input disk 10 of the variator. Spring washer Belleville applies force ("end load") to the input disk 10 and provides the ability to transmit torque from the input disk 10 through the rollers 14, 16 to the output disk 12.

By means of variation of the inclination of the two rollers 14, 16 (as described below) you can adjust the speed of the output disc 12 relative to the input disk 10. Through a combination of rotations of the input gear and the output of the variator in a mixed epicycle gear E1, you can change the power output gear. In the shown device, the transmission may be changed gear from full reverse, through "neutral gear", to the full line. However, with appropriate selection of gear operating range of the variator can be adapted to the needs. For example, the variator can be performed with the possibility of changing from the low reverse gear through a neutral gear to a direct increase of the transmission if the vehicle running gear, usually operated at a direct gear and only sometimes is operated in reverse gear.

The mechanism for changing the inclination of the two rollers 14, 16 in more detail is shown in figure 3. Each roller 14, 16 is installed with an option of rotation in raichoor 40 by means of trunnion 42, which is mounted for rotation in the opposite flat support plates 44, 46 of the roller. One end of each roller 40 is connected with a corresponding one of two ends of the cross member 48 of the lever 50 control through the spherical bearing 52 (for example, "Rose bearing"made Rose Bearings Limited). The lever 50 of the control is equipped with a hinged finger 54, located midway between the center points of the two spherical bearings 52. Pivot pin is in the slot 56 of the same width as the diameter of hinge finger, but continues in a radial direction relative to the axis of rotation of the variator. In the mounting lug 58, which acts in the variator in the space between the input and output disks 10, 12, made the slot 56.

The lever 50 is equipped with a shoulder 60 which protrudes from the crankcase of the variable in the direction perpendicular to the connection line of the Central points of two spherical bearings 52 (i.e., perpendicular to the axis of the cross member 48 of the lever). The end of the arm 60, which protrudes from the crankcase of the variator, made with a hole 62 for connecting two bozinovski cables (not shown) or other direct mechanical connection for rotation of the lever in opposite directions. The connection is a direct mechanical connection from the person operating the equipment, part of which forms the box the gear, and it is important that any force to the lever 50 should be applied in the direction perpendicular to the longitudinal axis of the shoulder 60, so no need to apply any force along the longitudinal axis of the shoulder 60. For example, the shoulder 60 may be connected to the accelerator pedal of the vehicle or pedal acceleration and reverse.

When the lever 50 is rotated, one of the rollers 10, 12 is pushed and the other pulled, both with equal torque. Mount hinge finger 54 within the slots 56 in the mounting lug 58 provides the ability to move the finger 54 in the radial direction inward and outward, and this ensures that the horizontal force from the rollers equalized and neutralized each other. This is important in cheap assemblies in which the components manufacturer, is probably less accurate. Radial movement of the hinge arm allows movement of the lever in the position in which any violation of the balance between the two rollers, which are the result of differences in production will be offset.

1. Variation transmission containing the input shaft, the input disc mounted on the input shaft for rotation with it, the output disk facing the input disc and made with the possibility of a coaxial rotation with him, and input and output disks form toroidal is to satisfy the cavity between them; only two rollers located in the toroidal cavity; first and second means idlers are rotatably mounted respectively to the first and second rollers; means end load for pressing the rollers into contact with the input and output discs to transmit movement; lever means having an axis of rotation, and two means of idlers mounted on the lever means on opposite sides of the axis of rotation, and a turning means for turning the lever means about the axis of rotation, with the axis of rotation of the lever means is arranged to move in one specified in the radial direction relative to the axis of rotation of the input and output disk.

2. Transmission according to claim 1, in which the axis of rotation of the lever means fixed in the direction perpendicular to the radial direction.

3. Transmission according to claim 1, in which the lever means includes pivot pin, which is made with the possibility of displacement along the slot, which runs in the radial direction.

4. Transmission according to claim 2, in which the lever means includes pivot pin, which is made with the possibility of displacement along the slot, which runs in the radial direction.

5. Transmission according to claim 3, in which the diameter of hinge finger, essentially, the same as Shire is in the slot.

6. Transmission according to claim 4, in which the diameter of hinge finger, essentially the same as the width of the slot.

7. Transmission according to any one of claims 1 to 6, in which the axis of rotation of the lever means is arranged to move a given distance in the radial direction.

8. Transmission according to any one of claims 1 to 6, in which the turning means for turning the lever means about the axis of rotation contains a plot of the shoulder.

9. Transmission according to claim 7, in which the turning means for turning the lever means about the axis of rotation contains a plot of the shoulder.

10. Transmission according to any one of claims 1 to 6, optionally containing hinge means between each means of the roller and lever means.

11. Transmission according to claim 7, additionally containing the hinge means between each means of the roller and lever means.

12. Transmission of claim 8, further containing a hinge means between each means of the roller and lever means.

13. Transmission according to claim 9, further containing a hinge means between each means of the roller and lever means.

14. Transmission of claim 10, in which the hinge means includes a ball joint.

15. Transmission according to claim 11, in which the hinge means includes a ball joint.

16. Transmission by A12, in which the hinge means includes a ball joint.

17. Transmission in item 13, in which the hinge means includes a ball joint.

18. Transmission according to claim 1, in which the input shaft and the output drive form the input power mixed epicycle gear.

19. Transmission on p in which mixed epicycle gear is coaxial with respect to the input shaft.

20. Transmission on p, optionally containing means downshift, United with the release of mixed epicycle gear.

21. Transmission according to claim 19, further containing a means downshift, United with the release of mixed epicycle gear.

22. Transmission according to claim 1, in which the tool end load contains progtesterone tool.

23. Transmission according to article 22, in which the tool end of the load contains only progtesterone tool.

24. Transmission according to item 22 or 23, in which progtesterone tool passes between the transmission housing and one of the input and output disks.

25. Transmission according to article 22, in which progtesterone means includes a spring.

26. Transmission according to item 23, in which progtesterone means includes a spring.

27. Transmission in paragraph 24, to the second progtesterone means includes a spring.



 

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