Friction toroidal variator

FIELD: mechanical engineering.

SUBSTANCE: friction toroidal variator comprises inlet disk (2) and outlet disk (3) provided with toroidal surfaces, friction roller (5), spider whose one axle is provided with roller (5), holder (8) of friction roller, control mechanism, and mechanism for control of gear ratio. The second axle of the spider is fit in holder (8) of the friction roller that can rotate around the main axle of the variator. The control mechanism and mechanism for control of gear ration are made of gear sector (9) that rotates on the second axle of the spider secured to the first axle of the spider and housing (12) by means of worm gearing and spring (15) secured in housing (12) and connected with holder (8) directly or through the reduction gear.

EFFECT: simplified control and control of gear ratio.

8 dwg

 

The invention relates to the field of engineering, namely, the friction transmission with stepless stepless change gear ratio, and more particularly, to a transmission, in which the force is transferred through the rolling of the rollers on the tracks with toroidal surface.

A variable of this type in General contain the input and output disks, the surface of which, facing each other, made as part of the Torah, and friction discs relating to these surfaces, and a mechanism for changing the position of the friction discs. In progressive transmission, described in EN 2087777, GB 1395319, EP 0078125, EP 0133330, the position of the disks is changed by hydraulic cylinders. It is clear that such mechanisms have a large number of parts, structurally complex, require a supply of hydraulic fluid, the formation of channels within the body molding, application of sealing pressure.

Known variator US 3.276.279 chosen for the prototype, which changes the position of the friction disk, changing the angle of the plane of its rotation. Variable contains the input and output disks, with toroidal raceways. Between the toroidal surfaces are friction rollers. Each friction roller through bearings freely seated on one of the axes of the cross, which is the axis of rotation of the friction roller. This axis is particularly the inner ring of the bearing. The second axis crosses defines the cylinder planted side surface of the holder associated with the case. This cylinder is made with the piston double-acting, coupled with the roller carrier. The cylinder is connected to the input and output hydraulic conclusions. The change in the differential pressure acting on the piston of the fluid changes the angle of the plane of rotation of the roller, and accordingly, the gear ratio. The pressure changes of the hydraulic servomotor. The variator provided with a device control ratio according to the position of the servo motor. The main disadvantages of the prototype are the complexity of the control mechanism gear ratio, including the hydraulic system (pump, pressure sensors and fluid flow, a complex system of tubes for supplying fluid), resulting in high losses and a relatively small range of change of gear ratio is determined by the angle of deviation of the friction disk (about 50 degrees).

Thus, the object of the invention is to provide a simple and reliable variable speed drive controlled by the setting of gear ratio while expanding the range of its change. In addition, the object of the invention is to increase efficiency.

The technical result of the invention is to simplify control and management per the handout attitude with smooth change of the modes of operation of the variator.

The problem is solved in that the friction tore the variator, as a prototype, contains coaxial input and output disks with toroidal surfaces and at least one friction roller between them, interacting with them toroidal surfaces, the d-pad, on one of the axes is freely set the friction roller, the holder of the friction roller, and the control mechanism and control of gear ratio by changing the inclination of the friction roller with respect to an axis of the input and output disks.

The second axis OA crosses planted in the holder of the friction roller. Unlike the prototype, the holder has the possibility of rotation around the main axis of the variator. Mechanism and control of gear ratio made in the form of a gear sector, planted with the possibility of rotation on the second axis crosses and rigidly connected with the first axis crosses and through worm gearing, with the body of the variator, and a spring with one end fixed in the housing, and the other is associated with the holder of the friction disk directly or through a gearbox.

The change of gear ratio occurs when the rotation of the holder due to the crowding of the friction roller on the surface of the slave disk from rotation of the lead. Spring provides resistance to rotation of the holder about the master disk.

Further, the invention is illustrated by drawings, where figure 1 shows the kinematic diagram tore variator, figure 2 is a view in longitudinal section, figure 3 is a longitudinal view of the holder with a friction disc and a ring gear on it, figure 4 - view of the holder in a plane transverse to the axis of the variator, slip-disc, ring gear and threaded on the body 5, 6, 7 and 8 show different versions of the torus of the variator.

The variator consists of a drive shaft 1 with a fixed disk 2 with toroidal surface facing the same surface of the disk 3 is connected to the driven shaft 4. Discs 2 and 3 rotate around the main axis OA. At least one friction roller 5 located between the toroidal working surfaces of the disks 2 and 3 and tazapsidis with them, transmits rotation from the driving disk 2 to the slave disk 3. (Figure 1 shows two rollers, although they may be more). Axis OA of rotation of the rollers 5 mounted with two degrees of freedom in mutually perpendicular directions, for which the inner ring 7 of the bearing 6, which rotates the roller 5, mounted for rotation around an axis OO perpendicular to the axis OO installed in the holder 8. On the inside of the holder 7 is fixed toothed sector 9, which is in constant contact with the thread around the VA is iator ring 10 thread 11. This ring 10 is fixedly mounted in the housing 12. Holder friction roller 8 is mounted for rotation relative to the main axis OA, for example, in the bearing on the shaft 4 (or on the shaft 1, or on both shafts). The holder 8 has a ring gear 13, which works in conjunction with the control gear 14, which is connected with the spring 15 of the resistance to rotation of the holder 8.

The holder 8 as an option connects directly with a spring 15, a second end fixed in the housing 12 (connected with it).

Spring 15 directly or by reduction with selected resistance characteristic carries most of the load restraint holder 8 in position, adequate demand value through a balance of forces; torque on the shaft 1, the resistance to rotation of the driven shaft 4 and the resistance of the spring 15, which is opposite to the rotation of the holder 8 from the crowding of the friction roller 5. The spring 15 is always strained. The drag force of the spring 15 directly or through a gearbox in the most twisted state is equal to or less than the maximum torque (power) of the motor - position "B". The lowest resistance of the spring 15 in the promotion to the position "a" (figure 2) slightly more than or equal to the minimum engine torque (minimum sustainable speed).

Options and the execution:

1) Figure 2 - flat twisted spring 15 external end is connected to the housing 12, an inner end connected to the shaft of the control gear 14.

2) the Spring 15 is connected by the end of the holder 8 directly without gear 14.

3) Twisted cylindrical circular cross-section spring - one or two - (15) is located on the holder 8 (figures 5, 6)being connected to the shaft 16 with the gear 17, with around ring 10, having a toothed thread 18 on the side. The shaft 16 is connected with persistent cups 19 of the spring 15 and the wires or rods 20.

The friction pad roller 5 may have several variants, for example:

4) is Rigidly fixed to the ring - figures 1, 5.

5) In the form of a sector of brake pads with spring-loaded backlash from the geometric center axis OO3bottom pads are drawn in total thrust washer and can have partitions. Required Meridian reducing the size of the pads to contact the lateral sides of 1 mm in this amount in figures 2, 3.

6) Pads of circular cross section, mounted on rollers or anti-friction pads, rotating around its axis while changing the angle of rotation of the disk 5 in contact with the working surface of the disks 2 and 3, figures 7, 8.

Options 5, 6 are designed for drift compensation of the position in the plane of rotation of the friction surface of the roller 5 is in contact when the angle of rotation is, against hysteresis.

7) Management (and; or) clarifying management is the impact on the ring gear 13 of the holder 8, the control gear 14 with spring (and or) with gear (and; or) electric motor under the control of the controller.

Orientation in the description of operation of the variator following: from the drive shaft 1, the rotation of the driving shaft 1 to the right thread around the ring 10 left. At any position of the roller 5, except "A", and the resistance of the driven shaft 4, the smaller the force of the spring 15, the holder 8 is rotated counterclockwise (left), drawing in a charge on the surface of the master disk 2 (relative) the friction roller 5. Sector 9 changes the angle of rotation of the roller 5 to the stop in position "A" regardless of the rotation of the disk 2. Designation ratios: for example, A=1/4, where 1 is the number ratio of rotation of the slave (VM) shaft, 4 - master (BM) - BM/BM and in the future.

During the rotation of the driving shaft 1 with disk 2, the friction roller 5 perceives rotation and passes it to the confronting disk 3.

When the maximum normal resistance to rotation of the driven shaft and its nevedenii (when starting transport) from position "A" VM/VD=1/4 figure 1 the roller 5 under the action of drive 2 receives relatively stationary disk 3 along the rotation of the holder 8, under the action of the spring 15 from the least resistance of the spring to most who have - the holder 8 meets increasing resistance, sector 9, moving contact with the threads 11 of the ring 10, changes the angle of rotation of the roller 5, i.e., the axis OO axis OA, changing this ratio from lowest to highest VM/VD 1/4=>4/1 (in this embodiment) from the position "A" to "In" figures 1, 2, the force of the engine torque by means of the modified ratio of rotation of the discs 2, 3 is sufficient for rotation of the disk 3, together with the acceleration to which the corresponding value of the speed stops the rotation of the holder 8 under the action of the increased resistance of the spring 15.

When you reduce the resistance to rotation of the driven shaft 4, the holder 8 under the action of the spring 15 rotates in the reverse direction (to the left), reduces the ratio VM/VD=>1/4"".

Thus, when selected, the resistance of the spring (or other device resistance) of the variator mechanism provides a continuous smooth change of the gear ratio under changing loads of the driven shaft and the speed of the leader.

Smooth start of rotation is provided as follows: at start of rotation of the holder 8 and the toothed sector 9, after making several turns, changing the ratio of rotation of the discs 2 and 3, due to gradual increase in the resistance of the spring gradually suspended while starting rotation led is on disc 3, that provides stretching efforts. At maximum resistance to rotation on the driven shaft 4 of the holder 8 in its rotation, by reason of overcoming power resistance moving and inertia, will put the friction roller 5 to greater than necessary relation to rotation of the driven disc 3 - when using existing stocks of the working surface of the disks 2 and 3, the deflection angle of the roller 5.

Thanks to the above described effect of the beginning of the rotation shaft 4 will happen to objectively lesser rate than if it was a continuation of the rotation.

Smooth change of gear ratios is provided in addition to the above, by changing the ratio of rotation of the discs 2 and 3 only in the "crowding" of the roller 5 on slower disk under the action of the presenter. Pull the rotation of any of the disks 2 or 3 can also be smoothed control system (spring) through the gear 14.

Friction tore variable containing coaxial input and output disks with toroidal surfaces and at least one friction roller between them, interacting with them toroidal surfaces, the d-pad, on one of the axes is freely set the friction roller, the holder of the friction roller and the mechanism and control of gear ratio by changing the inclination of the friction roller relative what about the main axis of the input and output disks, characterized in that the second axis crosses planted in the holder of the friction roller with the possibility of rotation around the main axis of the variator, the mechanism and control of gear ratio made in the form of a gear sector, planted with the possibility of rotation on the second axis crosses rigidly connected with the first axis crosses and through worm gearing with the housing, and a spring with one end fixed in the housing, and the other associated with the holder, directly or through a gearbox.



 

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