Drive mechanism for a continuously variable transmission

 

The invention relates to mechanical engineering, in particular to a device transmission with stepless gear ratio. The device variation of the transmission includes one or more input disk and output disk, which form one or more toroidal cavities between them. Several rollers are located in the above-mentioned toroidal cavities. The rollers are held in contact with the respective disks by means of application of pressure end load. One of the disks mounted on the shaft by an intermediate relatively flexible element to provide a degree of bending of the shaft without deformation of the toroidal cavity. 16 C.p. f-crystals, 6 ill.

The present invention relates to a device transmission with stepless gear ratio type of rolling friction on the toroidal orbit, which is called variation (CVT).

In such a device is the main shaft, which is driven, for example, an internal combustion engine, which is transmitted to the two input disks mounted on the shaft. Two output disk is set opposite sides to each other and between the input disks and are offered the weekend drives through a few videos, located in the toroidal cavity, which is provided between the input disks and output disks.

Also known variable-speed drives with a single cavity in which one of the input disk mounted for rotation on the input shaft and one output disk facing the input disc in such a way that forms a toroidal cavity in which is located a few videos of power transmission. Despite the fact that this device is less inherent disadvantages described here, it is obvious that the present invention is applicable in a device with a single cavity.

The rollers are hydraulically efforts means the end of the load, so that they come into contact with surfaces of the respective input and output discs to transmit torque from the input disk to the output disk. Energy is transmitted from the output disk via, for example, chain drive for the next transmission element, such as a planetary gear.

Drive through the circuit creates a transverse load on the shaft and at high levels of power transmission may cause bending of the shaft. The degree of bending is relatively small, but it can have a significant impact on the position of the two output disks, which can increase the load on the, that will not allow the drive force to be transmitted effectively from the input disk to the output disk.

It is obvious that the influence of bending of the shaft essentially leads to deformation of the toroidal cavity between the input and output disks.

Eliminating the above drawback can be briefly formulated as the adoption of a relatively small degree of bending of the shaft and then providing some flexibility in the installation disk so that bending of the shaft disks was provided the opportunity to rotate in planes parallel to one another, and thus to retain the shape of the cavities.

In the application GB-A-436363 the mechanism of power transmission with variable speed, with toroidal disks and rollers, in which one of the disks installed on the support shaft by means of one or more of the tooth or Cam on the front surface, which engages with the clutch fixed key on the Central shaft. Such a device provides a certain degree of relative movement between the disc and the shaft, but this design can be improved.

The purpose of this invention is the provision of a transmission device in which one or more disks mounted on the shaft of OOI.

Accordingly, the present invention provides a device variation of the transmission containing the input shaft, one or more input disks mounted on the shaft for rotation with the output node of the drive, and the input disk and the output node of the disk form between one or more toroidal cavities, a few rollers located in the cavity or cavities, and means for application of pressure end load to hold the rollers in contact with the appropriate disk or disks to transmit driving force, characterized in that one of the disks mounted on the shaft by an intermediate relatively flexible element.

Relative to the flexible element can be attached to the sleeve at an inner radial location, and the sleeve is attached to the shaft to be rotatable together with him.

For example, the sleeve may have slots to be able to rotate with the shaft axis relative to the shaft.

Relative to the flexible element can be attached to the sleeve with clamping ring.

The flexible element can be attached in the outer radial location to the ring clutch.

Ring clutch may be about is rnative the disk may be provided with protrusions, members into engagement with the corresponding grooves on the ring clutch.

Relative to the flexible element can be firmly fixed in the specified external radial location with the outer clamping ring.

On the shaft can be installed jet plate having two or more sets of pins, one of these sets of pins protrudes through an opening with a gap in the flexible element for contact with the surface of the specified one of the disks, with the pins of one of the other of these sets of pins engages with a relatively flexible element in the inner radial location.

The device may include a node clamping nut, which is installed with the threads on the shaft so that turning of the jet plate for contact with the specified one of the disks through the appropriate one of these sets of pins.

Another of these drives can be mounted for rotation with the shaft and secured by means of a stop to prevent axial movement.

The node of the output disk can be mounted on the bearing means, which has a partially spherical articulating surfaces, providing an opportunity for the host disk rotating the shaft.

In the above construction, the flexible element can also be fixed on the jet plate of the mechanism of the mechanical load.

In the above construction, the flexible member can be firmly fixed on the jet plate and the hub by bolting or riveting.

In any device, the flexible element can be firmly fixed on the drive through the device of a bolt or rivet.

In another design, the flexible element in any device may be pre-configured or pre-loaded, so that after application of the mechanical load it is essentially perpendicular to the specified axis of the shaft.

The present invention disclosed in detail with reference to the corresponding drawings, in which: Fig. 1 is a schematic view of the device transmission with stepless gear ratio of this type, which may include the present invention; Fig. 2 - the view from the spatial detail of a variant of implementation of the disk node according to the present invention; Fig.3 is a section along the line a-a in Fig.2; Fig.4 is a section along the line b-b In Fig.2; and Fig. 5 and 6 is a cross-section of an alternative implementation of the present invention.

With Sator, which contains the input shaft 10, two input disk 12, 14 and two output disk 16, 18, two sets of rollers 20, 22, which are located in the toroidal cavities 24, 26 formed between the input and output disks, and chain drive 28 mounted on the two output disks 16, 18.

Two input disk 12, 14 mounted for rotation with the shaft 10, for example, using a slotted supports, while the output disks 16, 18 have the possibility of free rotation relative to the shaft 10.

The input disc 14 has a limited axial movement, and the disc 12 is fixed against axial movement on the shaft by a stop, not shown, on the shaft 10.

The disk 14 is subjected to a load in the direction to the left as shown in Fig. 1, for example, by hydraulic pressure, so that the sets of rollers 20, 22 are held in contact with the toroidal surfaces of the input and output disks that allows transmission of drive force from the power source, such as an internal combustion engine, through a chain drive 28 for the next transmission element of the vehicle, for example not shown, the planetary gear.

It is clear that the chain drive 28 may impose a bending effect on the shaft 10 and therefore can happens is while the load on the remaining rollers may be reduced.

Increasing the load on some of the rollers may be unacceptable, because the videos are unreasonably high voltage, while reducing the load on the remaining rollers will reduce the efficiency of the drive between the input and output disks, as between the input and output discs may slip.

To prevent or substantially reduce the deformation of the toroidal cavities 24, 26, which is created by the bending effect applied to the shaft 10, in the present invention proposed design, which allows the input and output disks to take the position of the planes of rotation, which are and remain essentially parallel to one another, when there is a bend.

In Fig.2, 3 and 4 show the node 30, which allows you to set the disk 14 to rotate with the shaft 10, to transmit the driving force, but also allows the plane of rotation of the disk to be non-perpendicular with respect to the shaft 10.

Node 30 includes a relatively flexible element, such as a diaphragm 32, which is mounted in the inner radial location to the spline hub 34 by means of clamping rings 36 and screws 38, while sliczna device is designed as a clip from a sheet of spring steel (for example, spring steel BS 1449:CS80). Other suitable alternatives, however, are obvious to a person skilled in this field.

The sleeve 34 has a possibility of axial movement in the slots made on the shaft 10, and the axial displacement of the sleeve 34 is limited by using the ledge 40, made on the shaft 10. As shown in Fig.3-6, between the drive shaft and provided with a gap G for the required relative movement.

In the outer radial location of the aperture 32 is attached to the ring 42 of the clutch by the clamping ring 44 and screws 46.

The ring 42 of the clutch is made with rectangular teeth 48 arranged on its periphery, which engages between the respective teeth 50 provided on the circumference of the disk 14, for example like a clutch. The engagement of the teeth 48 and the teeth 50 allows transmission of drive force from the diaphragm 32 to the disk 14, and sets the disk 14 relative to the shaft 10. It is obvious that the disk may be provided with protrusions having the ability to enter into the corresponding notches on the ring clutch.

Round jet plate 52 mounted on the shaft 10 and has two sets of pins 54, 56 installed in the conical countersunk holes 58, 60 number of pins.

Node 30 is pre-loaded with node 62 of the nut that holds the nut 64 and a locking plate 66, bolted with a nut 64.

Between the nut 64 and the plate 52 is a washer 68 Belleville.

Rotation of the nut 64 exerts pressure through the washer 68 Belleville on the plate 52, and the pins 56 are holes in the clamping ring 36, so that the plate 52 rotates with the diaphragm 32.

At the same time, the pins 54, which pass through the holes with a gap in the diaphragm 32 are in contact with the rear surface of the disk 14.

After the site was subjected to a preload, thus clamping ring 66 is secured in place to prevent rotation of the nut 64.

It is obvious that the disk 14 is effective pre-loaded so that the rollers 22 in the cavity 26 come into contact with the input disc 14 and the output disc 18.

Also evident is that as the teeth 48 of the ring 42 of the clutch are in engagement with the teeth 50 on the outer surface of the circumference of the disk 14, the driving force can be transmitted from the shaft 10 to the disk 14.

Node 30 also includes a housing 63 and the end cap 70, which is held in place not shown here means.

The shaft 10 has an inlet opening 72, on the days the surface of the plate 52. Aperture 32 provided with holes, so that the hydraulic medium can fill this space. Applied hydraulic load causes the sleeve 34 to come into contact with the stop 40, so that between the disk 14 and the diaphragm 32 there is a gap.

The site is provided with seals S in order to keep the hydraulic medium in the required amount.

It is obvious that when the shaft 10 is subjected to bending, a relatively flexible diaphragm 32 can bend, while rotation of the disk 14 that can deliver given the force from the shaft 10 to the disk 14, as well as to preserve the shape of the toroidal cavity 26.

In addition to the set, the disk 14, the disk 12 can be installed in the usual way, i.e. using a spline connection and a stop to prevent movement of the disc 12 too far to the left as shown in Fig. 1, so that when the shaft 10 is subjected to a bending plane of the disc 12 will remain perpendicular to the axis of rotation of the shaft 10. It is obvious that the disk 12 can be set as described in relation to the disk 14.

It is possible to provide a device for the output disks 16, 18, installing the drives on the bearing, in which the interacting surface of the partially spherical, so siteline axis of rotation of the shaft 10.

It is obvious that the above arrangement may be reversed so that the input disks 12, 14 become output disks and the output disks become the input disks. In addition, it is obvious that the present invention can be applied to the variator with a single cavity, which has bearings that allow the bending of the shaft. Also obvious is that when you use the variator with two cavities, it is possible to provide a flexible drive for the output and the input disk, if necessary.

An alternative solution to the above, as shown in Fig.5 and 6, each of which is a transverse section, taken from slightly different angles, to show fully the elements of the flexible drive. In this device, similar elements have the same numerical designation as in Fig.3 and 4, and re-referred to only when necessary.

In an alternative embodiment, the disk 14 is also installed using a relatively flexible element 32, but this element is mounted somewhat differently. For example, the outer ends of the element fixed to the disc using blind rivets 100, which is rigidly fixed element 32 between a pair of clamping rings 102, 104 and the disk 14. Several timesthe provide sufficient strength to provide a torque transmission connection. The inner end of the element 32 remains attached to the splined sleeve 34, but also attached to the reaction plate 52. In a particular embodiment, several bolts 106 to protrude through the sleeve 34, the flexible element 32 in the reactive plate 52, which is provided with threaded sections 103 for receiving corresponding threads 110 on the bolts 106. Can be used in reverse arrangement, in which the bolts pass through the jet plate and includes a sleeve 34 with a screw threaded.

In a preferred embodiment, the flexible element pre-configured or pre-loaded, so that after application of the mechanical load he takes a position that is essentially perpendicular to the shaft and only deviate from it, if the shaft is subjected to bending. In fact, the arrangement is such that in the resting position, the Central portion of the flexible element according to Fig.5 and the sleeve 34 is moved in the direction of the cavity by a distance equal such that the disk 14 will be moved after the application of hydraulic end load. The arrangement according to Fig.5 shows the position when full hydraulic end load, and reactive plate 52 is shown offset from the disk 14 is fully inserted in the lock nut 64. Before the app is no small gap (not shown) between the jet plate and a lock nut 64. This gap provides space for the necessary moves when applied hydraulic end load.

Claims

1. The device variation of the transmission containing the input shaft (10), one or more input discs (12, 14) mounted on the shaft (10) for rotation with it, the set (16, 18) of the output drive and input the disk or disks (12, 14) and the set (16, 18) of the output drive form one or more toroidal cavities (24, 26) between a few rollers (20, 22) located in the cavity or cavities (24, 26), and means for application of pressure end load to hold the rollers in contact with the respective drive(12, 14, 16, 18), to transmit the drive force, wherein one of the disks (12, 14) or drive set (16, 18) of the output disks mounted on the shaft by means of an intermediate flexible element (32).

2. The device under item 1, characterized in that the flexible element (32) is attached to the sleeve (34) in the inner radial location, and the sleeve (34) is attached to the shaft (10) rotatably together with him.

3. The device according to p. 2, characterized in that the sleeve (34) has slots through which is provided the possibility of its rotation somtam, that the flexible element (32) is attached to the sleeve (34) clamping ring (36).

5. Device according to any one of paragraphs. 1-4, characterized in that the flexible element (32) is configured to mount in an external radial location to the ring (42) clutch.

6. The device under item 5, characterized in that the ring (42) clutch contains tabs (48), and the disc contains the corresponding recess, so that the protrusions are engaged between the respective protrusions (50) on the specified disk.

7. Device according to any one of paragraphs. 1-6, characterized in that the flexible element (32) is rigidly fixed in the specified external radial location through the outer clamping ring (44).

8. Device according to any one of paragraphs. 1-7, characterized in that it contains reactive plate (52) mounted on the shaft (10) with jet plate (52) has two or more sets of pins (54, 56), and one of these sets of pins (54) acts through the holes with a gap in the flexible element to contact with the surface of the specified one of the disks (14), and the pins of one of the other of these sets of pins (56) engages with the flexible element (32) in the inner radial location.

9. The device under item 8, characterized in that it contains the contact with the specified one of the disks (14) through respective of these sets of pins (54, 56).

10. Device according to any one of paragraphs. 1-8, characterized in that the other of these disks (12) mounted for rotation with the shaft (10) and includes a tool stop to prevent axial movement.

11. Device according to any one of paragraphs. 1-10, characterized in that the hub (16, 18) of the output disc is mounted on the bearing means, which has a partially spherical articulating surfaces, whereby the disk node is provided rotatably relative to the shaft (10) and the adoption of the rotation plane other than perpendicular relative to the shaft (10).

12. The device under item 8, characterized in that the flexible element (32) is rigidly attached to the jet plate (52) mechanism of the mechanical load.

13. The device according to p. 12, characterized in that the flexible element (32) is rigidly attached to the jet plate (52) and the hub by bolting (106) or rivets.

14. Device according to any one of paragraphs. 1-13, characterized in that the flexible element (32) is rigidly attached to the disc (14) via a bolted connection (46) or rivets.

15. Device according to any one of paragraphs. 1-14, characterized in that the flexible element is pre-configured or pre-loaded, so that when the application of the mechanical load he even, that variable contains two input disk and output disk, and these output disks are to each other opposite sides and located between the two input disks.

17. Device according to any one of paragraphs. 1-15, characterized in that the variable contains two input disk and two output disk, and the specified input disks are to each other opposite sides and located between the two output disks.

 

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