Variator

FIELD: machine building.

SUBSTANCE: variator includes raceways, the first and the second rollers (199a, 199b), each of which is installed with possibility of being rotated in the corresponding holder (118a, 118b), roller control element that allows it to perform rotation about the rotational axis and translational movement. Variator also includes a damper that dampens translational movement of the control element.

EFFECT: enhanced reliability.

12 cl, 10 dwg

 

The level of technology

The present invention relates to variable-speed drives, that is, to devices for the transmission of motion with constant change of the gear ratio between the input rotational member and the output rotary element, and more particularly to variable - speed drives in which the drive is transmitted from one raceway to the other group of rollers that roll along the respective surfaces of the raceway, and is arranged to move for a change of gear ratio.

In many published patent applications from the company Torotrak (Development) Limited we are talking about such a variable-speed drive, in which at least one pair of raceways mounted for rotation around a common axis (called below the axis of the variator) and is directed essentially polutoroetazhny depth surfaces, which together form an essentially toroidal cavity. In this cavity mounted rollers that roll on extended surfaces of the raceways for transmitting drive from each other. While the fastening means of the rollers allow them not only to rotate around their own axes, but also to make the deviation by changing the angle formed between the axis of the roller and the axis of the variator. This deviation performed by the rollers in unison, is associated with changes in relative velocities of the tracks kachani and, therefore, with the change of gear ratio provided by the variator. This type of device is often referred to as CVT friction-rolling with toroidal path.

In recent years, have been proposed various mechanisms for regulating the deflection rollers, but the main reference in this regard refers to the published international patent application WO 2006/084906 (application number PCT/ER/050860, Torotrak (Development) Ltd and others), in which for the above purpose it is proposed to use a simple mechanism. The drawing of this application are presented in figure 1. Its reference position changed.

This variator 10 has two rollers 12A, 12b, mounted in a cavity formed between a pair of the above polaroiding depth of the raceways, the periphery of one of which is indicated by the reference position 14. The other raceway is not shown, because otherwise it would close the rollers. Each roller is mounted for rotation around its own axis between the forks 16 of the respective holder 18a, 18b. Each of these holders is attached via a corresponding ball joint 20A, 20b to the lever 22. While still attached to the body of the variator (not shown) of the finger 24 forms the axis of rotation of the lever in its slot 26. This lever has a cross member 28, passing on both sides of the axis of rotation, when ball joints 20A, 20b are attached to the cross member on opposite sides of the axis of rotation. To control its rotation and, consequently, to control the transmission ratio of the variator is used radial shoulder 30 of the lever. This lever, for example, can be attached to the pedal going to the control device driver. Alternatively, it may operate through a power mechanism such as a hydraulic drive.

Since the rollers 12 are enclosed between tracks 14 rolling their centers make movement on a circular path 31 around the common axis of the raceway (the axis of the variator), which is designated in the drawing by cross 34. From this drawing it is obvious that rotation of the lever causes the rollers to move in the same circular direction around the axis (both clockwise or both counterclockwise). The displacement of the rollers causes them to regulate themselves in unison to new angles (i.e. angles of both rollers are changed essentially by the same amount) and, thus, to change the gear ratio. When ball joints 20A, 20b provide them with the necessary freedom of movement.

The variator 10 is used only mechanism - lever 22, to give effect to both clips. It is known that a variable of this type have disadvantages related the data with unequal distribution of the load between the rollers. If the rollers take angles that even very slightly not the same, then one of them will provide a gear ratio that is different from the other. This error rate should be regulated by slippage on the surface section of the roller/raceway, but the load is not evenly distributed between the rollers, which leads to very undesirable consequences, including poor performance and excessive wear. This misalignment may occur due to manufacturing tolerances, etc. to avoid these problems, the control mechanisms rollers, using one drive, often provides videos some additional freedom of movement, providing them with the opportunity to find positions in which the load will be distributed equally. In figure 1, for example, this is achieved through the slots 26 to ensure that the movement of the lever 22 in a radial direction relative to the axis 34 of the variator. Radial displacement (namely radial translational movement) of the lever causes the rollers to move in a circular motion on their circular paths 31, it should be noted that where the rotation of the lever causes the rollers to move in the same circular direction, the translational movement of the lever causes them to move about isobologram direction (that is, one moves clockwise, and the other counterclockwise). Therefore, the translational movement of the lever changes the angle of one roller relative to the angle of the other. Any irregularity in the distribution of load between the rollers leading to effects on the lever resultant force which tends to move it, and the resulting displacement (translational movement) seeks to balance the load on the rollers. This lever, of course, tends to occupy a radial position in which the load on the rollers is distributed evenly.

It was found that the mechanism shown in figure 1, is exposed to excessive vibration, and that the solution to this problem is the subject of this invention.

Disclosure of inventions

In accordance with the present invention proposed a variable containing the first and second raceways that are installed with the possibility of rotation around the axis of the variator and having turned polutoroetazhny recessed surface, the first and second rollers located between the raceways for the rolling elements in their deep surfaces and, thus, the transfer drive from one raceway to the other at continuously varying a transmission ratio, each roller is mounted for rotation in the respective holder and are free from committing deviation d is I change the angle between its axis and the axis of the variator, and the control roller, provided with fastening means that allow it to perform as (a) rotation around the axis of rotation, and (b) translational movement, while the holders are attached to the control on opposite sides of the axis of rotation so that rotation of the control causes like movement of the rollers in the same circular direction around the axis of the variator, and, therefore, their regulation in unison to new angles, thereby providing a change in the transmission ratio, and the translational movement of the control to change the angle of inclination of one of the rollers relative to the angle of inclination of the other roller and, thus, allows the rollers to take positions in which the load is balanced, this variable contains a damper that DAMPS the translational movement of the control.

Here and below the term "progressive movement" is used to denote movement, leading to change the location of the object, and in order to distinguish this term from the term "rotation". The term "displacement" is used in relation to traffic related to the translational movement or rotation, or both. Of course, these terms are widely used in this sense.

<> The damper may be damp only translational movement control, or it can be damp as translational movement and rotation of this control.

Preferably, the damper was friction. It can, for example, include a spring to bias together the two surfaces, the friction which resists translational movement control. However, there may be used and other types of damper. For example, the damper may be hydraulic.

Most preferably, the control was a lever mounted through the axis of rotation, around which it can rotate. This lever should have freedom of rotation only in a small angular range, and the term "rotation" should be understood in this sense. The axis of rotation can be moved to provide translational movement of the lever. Preferably, the damper influenced the axis of rotation for damping its translational movement. Thus, the damping may be provided only in relation to the rotational movement of the control, not its translational movement. Alternatively, the damper can operate between the fixed part and the control for dempfirovany is as rotation, and the progressive movement.

Preferably, the fastening means of control provided him with only one degree of translational freedom of movement. Even more preferably, the control had the ability to move only in the direction of essentially radial relative to the axis of the variator.

The fastening means of the control preferably contain a slot that defines the direction in which the control can perform translational movement, and a driven element, moving in the slot.

Next will be described the specific embodiments of the present invention offered only as an example and with reference to the accompanying drawings.

Brief description of drawings

Figure 1 is a somewhat simplified view of the variator, made according to the prior art, when viewed along the axis of the raceway, and one of the raceways are not shown to show internal components;

Figa and 2B are views in perspective of the lever according to the present invention, differing from each other by the fact that on FIGU not shown bracket, in order to show the internal elements, which are partially shown in cross section; and figs shown enlarged the first type of part, shown in figv, with concealed element, shown by the dotted line.

Figa and 3B are a front view and side view, respectively, of node lever/roller made according to the present invention;

Figure 4 is a front view of the same node lever/videos, but with the bracket used to install;

Figa and 5B are views from above in the section buttons, which forms a part of the lever mechanism;

6 is a view in cross section of a universal joint, which is part of the lever;

Detailed description of the invention

Figure 2-4 shows the lever 122, which, as the lever 22, as described with reference to the prior art, is designed to control the movement of the rollers in the variator. It is installed with the possibility of rotation in the bracket 150, which in turn must be rigidly attached to the housing (not shown) of the variator. This bracket includes front and rear 152, 154, attached to each other by means of fixing screws 156. The rear portion 152 is made in one piece with it, the back plate 158 with through holes for attaching the bracket to the housing of the variator. In the rear plate 158 is made in the rear of the slot 160. The front part has a front plate 162 with made in her front slot 164. In this particular embodiment, the implement is placed front and rear slots 160, 164 have the same shape and are aligned with each other. In the respective slots are front and rear buttons 166, 168, they have a rectangular shape, and their side surfaces provide a sliding fit in these slots, while their length is shorter than the length of the slots, so that they can move along these slots. While the side sections or flanges 170, 172 (best seen on figure 5) made in one piece with these buttons held in a lateral direction from them. These buttons are mounted on each side of the lever 122 and attached plug tube 174 (see figs), which passes through the hole in the lever 122, and the ends of which enter into corresponding blind holes in the buttons 166, 168. Insertion tube 174 provides a pivoting linkage 122, which is thus able to rotate within a limited angular range around the axis of the limited insertion tube 174, and to move a short distance in the direction defined by the slots 160, 164.

The Assembly includes a simple fastening of the front and rear portions 152, 154 of the bracket 150 to each other around the lever 122 and buttons 166, 168, whereupon the lever and buttons are in the United status.

According to the present invention, this mechanism includes a device for damping displacement (translational movement) this is the site of a lever. For this purpose, the spring 176 is running out the front and rear buttons 166, 168 in the side. In the present embodiment, the spring is helical and pre-stressed (compressed) during Assembly. It passes through the insertion tube 174 so that its ends rest against the corresponding buttons 166, 168. Thus, the side sections 170, 172 of the rear buttons are shifted relative to the adjacent surface of the rear plate 158 and the side sections 170, 172 of the front buttons are shifted relative to the front plate 162. The friction between the side sections 170, 172 and adjacent surfaces prevent translational movement of the node of the lever and thus provide the desired damping. The purpose of damping is the dissipation of energy, which otherwise can lead to undesirable oscillatory movement of the lever.

It should be noted that this campfires only the translational movement of the lever 122. As part of that provide frictional damping, side sections 170, 172, attached to the lever only through the support formed by the inserted tube 174, the rotational movement of the lever is not impeded.

On figa-2C rollers and their holders are not shown, but can be seen on figa-3B and 4. In this embodiment, the cross arm is formed protruding in the lateral direction of the flange and a, b having a through hole 182 (figs). This universal joints 184a, b attach the appropriate holder 118a, b roller to each flange. The design of the universal hinge 184 is best presented on Fig.6. Each of them has a first part containing a threaded shank 186, taken in one of the holes 182 and attachable to the flange 178 nut a, b (pigv). The shank 186 passes to the nesting section 190, a spherical inner surface which receives the spherical head 192 of the second portion 194 of the hinge. The first part may, for example, be stamped around the head 192 to hold. Another threaded shank 196 protrudes from the head 192 and made in one piece with it. In the present embodiment, each of the holders 118a, b variator is formed of a single lever a, b, attached to the corresponding universal joint through the threaded shank 196. Thus the rollers a, b is installed on the corresponding levers a, b with respective rotary bearings.

On FIGU can be seen that the levers a, b holders tilted. On figa-3B raceways of the variator is not shown, but their common axis of the variator) indicated by the dashed line 200. This imaginary line 202 through the center of the universal joint 184a and the center roller 199b, forms with the axis of the variator 200 not the nternet angle C. This angle is often referred to as the longitudinal inclination of the axis of rotation. It should be noted that in operation, the rollers are free to deviate from the line 202. As is known in the art, the deviation of the rollers is controlled by their interaction with the raceways on which they roll, the rollers will always strive to submit themselves so that their axes of rotation (marked on FIGU cross 204b) crossed the axis of the variator 200, and they can achieve this through the longitudinal angle of inclination of the axis of rotation. The lever 122 causes both rollers a, b, to move in the same direction - clockwise or counterclockwise around the axis of the variator 200. This would ensure that the axis of the rollers 204 199 would have come out of the region of intersection with the axis of the variator 200, if not for the fact that the rollers automatically adjust themselves, deviating from the line 202 to restore this intersection. By doing this, they move in unison to change the gear ratio of the speed provided by the variator. Thus, between the lever position and deviation of the rolls is a kind of relationship or interaction between the lever position and gear ratio of the variator, which is equivalent. When you select a specific position of the lever according to the government sets the gear ratio of the variator.

As has been described, it is assumed that such factors as manufacturing tolerances may result in rejection of the rollers will be slight differences, and therefore, the load distribution in this case would have been different if not for the fact that the node of the lever 122, the brackets 118a, b and rollers a, b, are able to move, to allow the rollers to find the position in which the load is distributed evenly. This movement (namely the translational movement) of the lever is due to the structural peculiarities of the lever 122, that is, in this embodiment, due to the slots 160, 164 and buttons 166, 168, moving in them. The progressive movement in this embodiment is performed in a direction that is radial relative to the axis 200 of the variator from the raceways of the variator. Move this node in this direction causes both rollers move in opposite circular directions around the axis of the variator 200 (one clockwise, the other counterclockwise) and, therefore, allows angles to be changed to reduce the unevenness in the distribution of the load.

In principle, there is a risk that this node is moved lever becomes oscillatory, and the node will move back and forth from their usual p is the situation, creating unwanted vibration. This problem is eliminated according to the present invention due to the above measures for damping movement of the lever.

As described above, the damping device shown in figa-6, only serves to damp the gradual displacement of the node of the lever, and not to dampen its rotation. In other embodiments, the exercise may be necessary to damp both types of movements node lever, and rotation and translational movement. Thus, there may be additional measures to eliminate unwanted oscillatory "behavior" - rotation of the lever/tilt rollers. According to a simple way to achieve this damping could be deleted buttons 166, 168, tube 174 and the spring 176, and instead they set lever 122 through a simple finger held in the slots 160, 164. In this case, the frictional damping could be provided by springs, pre-compressed between the lever 122 and the adjacent surfaces of the front and rear plates 158, 162 to provide friction tending to resist as the rotation and translational movement of the host vehicle. In this case, would be suitable spring conical washers (also known as Belleville springs).

It should be understood that the above-mentioned options implemented the recommended reading lists, first of all, as an example, and not limitation. Allowed many options and design alternative solutions that do not go beyond the scope defined in the claims.

For example, dampers, described here, can trigger friction, but it is possible to replace them for this other type of mechanism such as a hydraulic damper. There are also other options, compared with the above described structural arrangement, when the progressive movement of the lever slot; in principle, this slot may be made in the lever (as in the case of lever 22 in the variator 10, depicted in figure 1 of the prior art), or to the mounting means of the lever (as in the embodiment of the present invention to figa-6). The latter option is preferable, since the direction of movement of the lever 122 is always radial.

1. Variable containing the first and second raceways that are installed with the possibility of rotation around the axis of the variator and having turned polutoroetazhny recessed surface, the first and second rollers located between the raceways for the rolling elements in their deep surfaces and thereby transmit drive from one raceway to the other is Oh, for continuously changing a transmission ratio, each roller is mounted for rotation in the respective holder and are free from committing deviations to change the angle between its axis and the axis of the variator, and a control roller, provided with fastening means that allow it to perform as (a) rotation around the axis of rotation, and (b) translational movement, while the holders are attached to the control on opposite sides of the axis of rotation so that rotation of the control causes like movement of the rollers in the same circular direction around the axis of the variator, and therefore their regulation in unison to new angles, thereby providing a change in the transmission ratio, and the translational movement of the control to change the angle of inclination of one of the rollers relative to the angle of inclination of the other roller and, thus, allows the rollers to take positions in which the load is balanced, characterized in that it contains a damper that DAMPS the translational movement of the control.

2. The variator according to claim 1, in which the damper DAMPS only the translational movement of the control.

3. The variator according to claim 1, in which the damper DAMPS both translational movement and rotation of the control.

4. VA is iator according to any one of claims 1 to 3, in which the damper is friction.

5. The variator according to claim 4, in which the damper includes a spring to bias together the two surfaces, the friction which resists translational movement of the control.

6. The variator according to claim 1, in which the control is a lever mounted through the axis of rotation, around which it can rotate.

7. The variator according to claim 6, in which the axis of rotation is configured to move to provide translational movement of the lever.

8. The variator according to claim 7, in which the damper acts on the axis of rotation for damping its translational movement.

9. The variator according to claim 1, in which the damper acting between the fixed part and the control for damping as its rotation and translational movement.

10. The variator according to claim 1, in which the mounting means provide only one degree of translational freedom of movement.

11. The variator of claim 10, in which the control is arranged to move only in the direction of essentially radial relative to the axis of the variator.

12. The variator according to claim 1, in which the fastening means of the control contains a slot that defines the direction in which the control is capable of translational movement, and ve is my element, moving in the slot.



 

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16 cl, 11 dwg

FIELD: machine building.

SUBSTANCE: device consists of control part actuated by user for control of ratio (lever (50) and of device of working connection (rollers (18) of control part for regulation of ratio with movable part for transfer of variator torque. The connecting device corresponds to a hydro-mechanical arrangement. When a user actuates control part (50) for regulation of ratio there is regulated ratio of variator. The device also has the appliance for turning torque off (valve (60) actuated by a user for disconnection of the part for regulation of the ratio from the movable part for transfer of torque.

EFFECT: simplification of design.

17 cl, 3 dwg

FIELD: transport.

SUBSTANCE: invention discloses planetary variator, combination of reverse variable transmission system comprising these planetary variators, hydraulic system for reverse variable transmission control and method for this hydraulic system regulation.

EFFECT: higher engine efficiency due to lower specific fuel consumption.

12 cl, 13 dwg

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