Toroidal variable-speed drive unit

FIELD: machine building.

SUBSTANCE: variable-speed drive unit comprises master and slave toroidal wheels (2, 3) and roller (6). Their generatrices are made in the form of convex and concave curved surfaces. Due to arrangement of generatrices of working surfaces in master and slave elements in accordance with a certain dependence, area of friction pairs contact is increased.

EFFECT: improved kinematic characteristics of variable-speed drive unit.

3 dwg, 1 tbl

 

The invention relates to mechanical engineering and can be used in mechanisms with smooth speed control.

Known variable that contains the master and slave toroidal friction with a concave working surface, and in contact with the roller, the working surface of the sphere.

When transmitting the movement speed of rotation of the driven toroidal clutch can be adjusted by adjusting the angle of inclination of the axis of rotation of the roller /Revkov GA Stepless V-belt and friction gear / Gasiukov, Baani. - M.: Mashinostroenie, 1980. - S-244./[1].

A disadvantage of the known device is that effective engagement of the two friction can be achieved here only in one point, i.e. at a very small area, which transmitted power remains low. To increase the effective area of contact is impossible, since there are many points of contact with different gear ratios, the roller will have to work at the gap.

The technical result of the invention is the improvement of kinematic characteristics by increasing the contact area of the friction elements torus wheels.

This result is achieved that tore the variator, comprising a housing, installed on the shafts and interconnected master and slave tore wheel, roller, contactyou the speaker with wheels, mounted with a tilt of its axis of rotation: forming the inner and outer working surfaces of the friction made in the form of concave and convex curves. The distance R between the points taken at regular intervals for forming the curve and the axis of rotation of the clutch will be correlated among themselves as

where ρ1, ρ2...... is the distance from the specified non-point curve forming to the axis of rotation of the element.

In the proposed variator each point on the generatrix of the clutch is separated from the axis of rotation of the calculated value and it provides the same gear ratios over a larger area for contact of the friction that reduces slippage and provides increased transmitted power.

Figure 1 shows schematically the proposed variator, General view; figure 2 and 3 presents explanatory drawings.

The variator includes a housing 1, tore the wheels 2 and 3, one of which, for example, 2 - leading, they are set to meet one another vertices and mounted on the shafts 4 and 5; the roller 6 applies torus wheels 2 and 1 and is rotated around its axis on the shaft 7. The roller 6 due to podpruzhinennom (not shown) is always pressed his upper circular surface of the circular surface of the torus toroidal wheels 2 and 3. The roller 6 can be installed under different in the Lamy by turning the shaft 7 around the axis 8.

Tore the variator works as follows.

When the shaft 4 torque is transmitted to the torus wheel 2 in contact with the roller 6. The rotation of roller 6 is transmitted to another tore the wheel 3 and through the shaft 5 is supplied to the actuator (not shown).

As a result of performing forming the working surfaces of the master and slave torus wheels at a certain dependence increases the contact area of the friction pairs.

As a specific example of the development taken tore variable whose radius circular curve forming equal to 100 mm, the control point on the generatrix taken through arc segments 10 mm; the distance ρ, which separates this point from the axis of rotation of the wheel will be of magnitude (table 1), correlated with each other such dependencies

These distances can be represented as values generated for a detailed breakdown of the circular curve defined by the formula Y=R(1-cosφ), Nastavenie on segment m (in the given example, 30 mm).

td align="center"> X=R·sinφ 12.20
Table 1
No. of points wheelThe angle φY=R(1-cosφ)ρ=y+m
15°, 73
211°, 46
317°, 194.4734.47
0.91
422°, 927.9037.90
0.90
528°, 6442.20
0.89
634°, 3817.5047.5056.47
0.89
740°, 1123.5053.5064.43
0.89
845°, 8430.3060.3071.74
0.89
951°, 57At 37.8067.80
0.89
1057°, 3046.0076.00
0.90
1163°, 0354.70At 84.70

The movie in question has a toroidal variator is truncated spherical surface. Distance, taken on its generatrix to the axis of rotation of the roller, calculated according to the formula X=R·sinφ, are given in table 1.

Let the engagement of the roller with the surface of the torus wheel comes in 10, 9, 8. Then the gear ratio at the point of contact will be

If you then rotate the pulley counterclockwise, the contact will occur at points on the new site forming a torus wheel, but the gear ratio here and across the line of contact of the friction will be the same, as shown below.

The second position of the friction

The third position of the friction

These data confirm that the proposed development is provided by the engagement of the friction is not at the same point as the known analogues, and on line, that is at many times larger and this ensures the increase in transmitted power while significantly reducing the slip.

Tore the variator, comprising a housing, installed on the shafts and interconnected master and slave tore wheel and the roller in contact with the wheels mounted to tilt on its axis, forming inner and outer working surfaces of the friction made in the form of concave and convex curves, characterized in that it points taken at regular intervals on the generatrix of the torus frictions will defend from its axis of rotation on values of ρ, which relate to each other as

where ρ1, ρ2...... the distances from the given number the points of the curve line forming to the axis of rotation of the element.



 

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FIELD: mechanical engineering.

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