JPH07253145A - Toroidal type continuously variable transmission - Google Patents

Abstract

PURPOSE:To prevent interference between an interlocking connection means to insure the synchronous operation of a power roller and a gear housing, and to impart high rigidity to the gear housing, and in addition, to detect the abnor mal operation of the power roller quickly and precisely. CONSTITUTION:A common output gear is provided between both the output discs of two sets of continuously variable transmission units having input-output discs and power rollers 8, 9. A gear housing 31 for receiving and holding the output gear is provided, and roller supporting members 13a, 13b, 13c, 13d to support each power roller rotatably and precessing-turnably are respectively interlockingly connected by totally three pieces of endless wires 36a, 36b, 40. In addition, a precess cam 41 to detect the precessing-turning positions of the power roller 8, 9 is provided on one of roller supporting member 13a, 13c around which a longitudinal endless wire 40 is wound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal type continuously variable transmission, and more particularly, it sufficiently secures synchronized swinging rotation of respective power rollers in the same speed changing direction.

[0002]

2. Description of the Related Art In a toroidal type continuously variable transmission having a plurality of sets of continuously variable transmission units, all power rollers are naturally structured so as to swing and swing in synchronization with each other. It is configured.

However, there is a possibility that the above-mentioned synchronization of the power rollers may be lost due to fluctuations in operating conditions between the continuously variable transmission units, disturbances acting on those units, and the like. First, in order to prevent the abnormal operation of the individual power rollers from interfering with the synchronization from occurring, the power roller is actually put into practice.
A shift control device as disclosed in Japanese Patent No. 52 is proposed.

This is provided with first and second respective continuously variable transmission units 110 and 120, both of which are connected in parallel between common input / output shafts, as illustrated in FIG. In the toroidal type continuously variable transmission that transmits power, the power rollers 111a, 111b,
The roller supporting members 112a, 112b, 122a, 122b for supporting 121a, 121b are interlockingly connected to each other by wires or the like.

More specifically, the first continuously variable transmission unit 11
0 and the second continuously variable transmission unit 120 are coaxially arranged on the common axis I with their respective output disks 113, 123 being in close proximity to each other, and the respective input disks 114, 124 are The output discs 113 and 123, which are integrally provided on a shaft 131 coupled to the shaft 130 and are located opposite to the input discs 114 and 124, are rotatably supported on the shaft 131 and are Both output disks 113,
123 is drivingly connected by a spline 123a, and an output gear 132 coaxially arranged between the two output disks is drivingly coupled to the output disks 113 and 123 by a loading cam 133. Of the input disks 114, 124 and the output disks 113, 12
3, a pair of two power rollers 111a, 111b and 121a, 121, which are located with a common axis I therebetween.
b is clamped, and the power rollers 111a,
111b and 121a, 121b are replaced by respective roller support members 112a, 112b and 122a, 122.
b, each roller axis 115a, 115b, 125
Rotating around a and 125b, and swing axis 1
Around 16a, 116b and 126a, 126b,
The roller support members 112a and 112a, which are pivotally supported together with the roller support members,
b and 122a, 122b are interlockingly connected by a wire as illustrated in FIG.

In FIG. 5, the power rollers 111a, 111b and 121a, 12 are respectively provided.
b is the swing axis 116a, 116b and 126a,
When it is rotated around the 126 b in the direction of the arrow a in synchronism with each other at a constant speed, the gear ratios of both units 110 and 120 are synchronously shifted to the high speed side, and the transmission is steplessly moved to the high gear ratio side. Can be shifted and, conversely, those power rollers 1
11a, 111b and 121a, 121b are indicated by arrows b
By rotating the gears in the same direction at a constant speed in a synchronized manner, the transmission can be continuously stepped to the low gear ratio side.

By the way, in the interlocking connection structure shown in FIG. 6 (a), the roller supporting members 112a, 112b and 122a, 122b are respectively connected to each other in each of the first and second continuously variable transmission units. A single endless wire 117, 127 is wound so as to intersect in an X-shape on the way, and the roller supporting members 112a, 112a located on one side of the common axis I between the two continuously variable transmission units.
122a, one front-back endless wire 134
Is also wound so as to intersect in an X shape in the middle, and the respective wires 117, 127, and 134 are connected to the pins 118a,
By fixing the corresponding roller support members by 118b and 128a, 128b, synchronous rotation of those roller support members 112a, 112b, 122a, 122b, and by extension, all power rollers in the directions of arrows a and b is achieved. It is a guarantee.

Further, in the interlocking connection shown in FIG. 1B, one common endless wire 135 is used for all the roller supporting members 1.
12a, 112b, 122a, 122b, and the interlocking connection shown in FIG. 11 (c) shows that the roller support members 112a, 112b are provided in one continuously variable transmission unit.
In addition to wrapping one endless wire 117 around each of the
The roller support members 112a, 112b and 122a, 122b are wound around the roller support members 137 diagonally.
That is, the synchronized constant-speed rotation in the directions of the arrows a and b is ensured.

According to such an interlocking connection structure, when a certain power roller tries to change the swinging angle around its own swinging axis due to, for example, disturbance, each wire has its power roller. In the same gear shifting direction as the other power rollers in an interlocking manner with them, thereby effectively pivoting the swing angle of a certain power roller to limit all power rollers. It can be fully synchronized.

[0010]

However, the interlocking connection structure disclosed in this prior art is made only by paying attention to the fact that all the power rollers are synchronized and pivoted. No consideration is given to the relative arrangement of the other components of the transmission and the respective wires, and in order to perform the shift control,
It is necessary to feed back to the shift control device,
Detecting means for detecting the pivoting position of the power roller, and sometimes the axial position of the roller supporting member,
Since no consideration has been given to which roller support member is provided in association with the roller support member, the prior art is applied to, for example, a toroidal type continuously variable transmission as described in JP-A-1-216158. In this case, in addition to the output gear as a common gear drivingly connected to both output discs, a gear housing for accommodating and supporting a driven gear meshing with the output gear and a wire for interconnecting the continuously variable transmission units are provided. However, there is a problem in that it is difficult to dispose the gear housing because interference occurs as indicated by a virtual line.

A first object of the present invention is to avoid the interference between the gear housing and the wire as much as possible, and to make it possible to dispose a gear housing having a required high rigidity, and the first object of the present invention. The purpose of No. 2 is that, when the interlocking connection structure as illustrated in FIG. 6A is selected with the above-mentioned first purpose, even if any of the power rollers has an abnormal operation that causes a synchronous failure, The occurrence of abnormal operation is detected promptly and with high accuracy by sufficiently reducing the influence of wire elongation and other mechanical errors, and as a result, the occurrence of large abnormalities is avoided under the action of the shift control device. Especially.

That is, under the interlocking connection structure shown in FIG. 6 (a), for example, detection means is provided in association with the roller support member 112b, and a signal from the detection means is fed back to the shift control device to control the shift. In this case, when the power roller 121b supported by the roller support member 122b of the other speed change unit 120 is abnormally operated, the abnormal state is caused by the three endless wires 127, 134 and 117. Since they are sequentially transmitted to the detection means, mechanical error or the like unique to each endless wire causes a decrease in transmission accuracy of abnormality information in terms of time and quantity. Since it becomes impossible to feed back the information on the occurrence of the synchronization loss quickly and accurately, the second aspect of the present invention can be realized. Target is to solve these problems advantageously.

[0013]

The toroidal type continuously variable transmission of the present invention is basically the above-mentioned Japanese Patent Laid-Open No. 1-216.
Similarly to the one described in Japanese Patent No. 158, the input / output disks arranged to face each other and the two disks are arranged on both sides of the disk with the rotation axes of these disks separated from each other, and frictionally engage with the facing surfaces of the disks. Two sets of continuously variable transmission units, each of which has a pair of power rollers, are coaxially arranged with their respective output discs in close proximity to each other. A gear housing is provided for accommodating and supporting the gear, the gear housing is fixed to the transmission case, and each power roller is rotatably supported around its axis and its axis line is supported. A roller support member for swinging and pivoting is provided around a swing axis line orthogonal to the power swing direction of each power roller in the same speed change direction. An interlocking means for ensuring synchronized swing rotation is provided, and one roller supporting member is directly or indirectly provided with means for detecting the swing rotation position of the power roller. , The interlocking means,
Each one endless wire wound around each of the pair of roller supporting members of each continuously variable transmission unit, and each of the two roller supporting members adjacent to each other in the axial direction of each continuously variable transmission unit. And a single endless wire wound in the front-rear direction, and the detection means is provided in association with one of the roller support members wound with the endless wire in the front-rear direction.

Preferably, the gear housing includes one side of the gear housing, that is, the center axis of the gear is included.
Also, the extension of the front-rear endless wire is allowed in the gear housing only on one side of the center plane parallel to the planes passing through the respective central axes of the two roller supporting members wound with the front-rear endless wire. A constriction portion is provided inwardly of the gear housing.

More preferably, on the other side of the center plane, the gear housing is provided with a bulging portion which projects outward from the gear housing.

[0016]

In this toroidal type continuously variable transmission, especially, the number of endless wires is required by interlockingly connecting the respective roller supporting members of the respective continuously variable transmission units with one another in the front-rear direction endless wire. This can be minimized, and it is possible to effectively prevent a decrease in the rigidity of the gear housing due to the extension of the front-rear endless wire between the transmission units.

In other words, the gear housing for accommodating and supporting the gear must have sufficiently high rigidity against the forces in the twisting direction and the bending direction thereof in order to reliably support the meshing reaction force of the gear. However, when the wires for interlocking connection of the transmission units are extended as shown in FIGS. 6B and 6C, the gear hanging has a constricted portion with a large total volume, a notch portion, Since it is unavoidable to provide escapes, it is not possible to give high rigidity to the gear housing, and due to deformation of the gear housing, poor meshing of internal gears, deterioration of gear durability, noise generated by gears Problems such as increase in On the other hand, when interlocking the transmission units with one another in the front-rear direction, there is no need to provide a constricted part with a small total volume in the gear housing, so ensure high housing rigidity. Therefore, it is possible to effectively prevent the above-mentioned problems from occurring.

This is more effective when the constricted portion which allows the extension of the front-rear endless wire is provided only on one side of the gear housing, and the constricted portion is removed from the other side thereof. This is more noticeable when the bulging portion is provided on the other side of the gear housing to further increase the housing rigidity.

Further, in this continuously variable transmission, the detecting means for detecting the swinging pivot position of the power rollers is provided on either one of the roller supporting members around which the front and rear endless wires are wound, so that the power rollers are connected to each other. No matter which power roller has an abnormal operation that interferes with synchronous operation, the abnormal operation can be detected quickly and with high accuracy through the interposition of up to two wires. With the gear shift control device performing the control operation in this manner, it is possible to sufficiently prevent the occurrence of a large abnormality.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are vertical cross-sectional views of a normal toroidal type continuously variable transmission to which the present invention can be applied, which is basically described in Japanese Patent Application Laid-Open No. 1-216158. Is almost the same as.

Here, two sets of continuously variable transmission units 2 and 3 are coaxially arranged inside the transmission case 1, and the respective transmission units 2 and 3 are connected to the input disks 4 and 5.
, Output disks 6 and 7, and power rollers 8 and 9 in general.

Here, in each speed change unit, the input / output disks 4, 6 and 5, 7 are arranged so as to face each other, and the speed change units 2, 3 are arranged so that the output disks 6, 7 are close to each other. It is arranged on the spindle 10 in a posture.
Here, the main shaft 10 is rotatably supported by the transmission case 1, and the input disks 4 and 5 are rotatably coupled to the main shaft by ball splines 11 and 12 so as to be displaceable in the axial direction. Each output disc 6,7
Rotatably supported.

As is apparent from FIG. 2, the power rollers 8 and 9 are formed as a pair, and the power rollers 8 and 9 are arranged on both sides of the rotation axis of the input / output disks 4 to 7, and the power rollers of each pair are arranged. 8 and 9 are frictionally engaged with the facing surfaces of the corresponding input / output disks. In addition, each power roller 8, 9
The roller support member 13 rotatably supports the power roller axis line, and the roller support member itself is swingably rotatable with the power rollers 8 and 9 around a swing axis line orthogonal to the power roller axis line. To support.

In the continuously variable transmission unit 2 on the front and rear sides, this support of the roller support members 13 is carried out by bearing the upper end portions of both roller support members 13 to a common upper link 15 via bearings and the lower end portions thereof. The lower link 16 is connected to a common lower link 16, and in the continuously variable transmission unit 3 on the rear stage side, the upper end portions of both roller support members 13 are connected to the upper link 17 and the lower end portions are connected to the lower link 18, respectively. By doing. Each Azupalink 15,17
Supports the central portion of the lower link 16 and 18 through the upper link posts 19 and 20 so as to be tiltable, and the lower links 16 and 18 support the central portion of the lower link 16 and the lower post 2 respectively.
1, 2 and 2 are supported by the transmission case 1 so as to be tiltable,
As a result, the roller support members 13 of the speed change units 2 and 3 can be vertically moved under the action of the pistons 23 in the directions of the swing axis in opposite directions in synchronization with each other.

By the way, in order to ensure such synchronous displacement of the roller supporting member 13 between the front and rear continuously variable transmission units, here, as shown in FIG. 1, the lower links 16 and 18 are connected to the bridging member 24. Connect together by. In this sense, it is preferable that the upper links 15 and 17 are also integrally connected, but in reality, it is difficult to secure a space for disposing the bridging member. Instead, the upper link posts 19 and 17 are replaced. By integrally connecting 20 with the upper link post base 25, the force in the front-rear direction acting on the upper links 15 and 17 is sufficiently supported, and the synchronization performance between both transmission units is improved.

Further, as shown in FIG. 1, a cam flange 26 is arranged coaxially with the input disc 4 of the continuously variable transmission unit on the preceding stage side, and is provided on the opposing surface of the cam flange 26 and the input disc 4. Each cam surface and the cam roller arranged between these cam surfaces constitute the loading cam 27. The loading cam 27 is well-known, and transmits the rotation of the cam flange 26 by an input shaft (not shown) to the input disk 4 and inputs it by the relative rotation of the cam flange 26 and the input disk 4 according to the transmission torque. Thrust in the direction of the output disc 6 is applied to the disc 4.

On the other hand, the thrust reaction force acting on the cam flange 26 is input to the input disc 5 of the rear speed change unit 3 via the thrust bearing 28, the main shaft 10, the loading nut 29 and the disc spring, and as a result, The same thrust as described above is applied to the input disk 5 in the direction of the output disk 7.

Further, here, the output discs 6 and 7 of both transmission units 2 and 3 are drivingly coupled to a common output gear 30, and the output gear 30 is rotatably supported on the main shaft and a gear housing 31. And the gear housing 31 is fixed to the transmission case 1 by bolts 32 extending in the axial direction of the input / output disk. The rotation of the gear 30 is taken out from the output shaft 35 via the driven gear 33 and the counter shaft 34 which mesh with the gear 30.

FIG. 3 shows an example of application of the present invention to a toroidal type continuously variable transmission having such a structure. Figure 3
FIG. 13 is a bottom view of the roller support member shown with the oil pan removed, in which 13a and 13b respectively indicate the right and left roller support members of the front speed change unit 2, and 13c and 13d respectively. Rear gear unit 3
2 shows the right and left roller support members.

Here, a pair of roller supporting members 13a, 13b and 13c, 13d of the transmission units 2 and 3 are provided.
In the same manner as described with reference to FIG. 6A, each one of the endless wires 36a and 36b is wound in the middle so as to cross in an X shape to interlock the paired roller support members. Bring In this interlocking connection, in this example, each of the endless wires 36a, 36b is provided with two arcuate large-diameter portions 37a, 37b, which are positioned opposite to each other, and these large-diameter portions 37a, 37b are By fitting the arcuate cutouts (the cutouts provided in the roller support member 13d are shown by reference numeral 39 in the figure) provided in the corresponding roller support members 13a, 13b, 13c, 13d, The occurrence of slippage in the circumferential direction with respect to the roller support member is prevented.

By the way, the endless wires 36a, 36
The arc-shaped large-diameter portions 37a and 37b can be formed on b by, for example, caulking and fixing a sleeve that has passed through the wire body, or brazing the sleeve to the wire.

Further, here, the roller support members 13a on the right side of the transmission units 2 and 3 at the front and rear stages,
As shown in FIG. 6 (a), one endless wire 40 in the front-rear direction is connected to the other end 13c along the X line.
Roller supporting members 1 that are crossed and wound around in a letter shape.
3a and 13c are interlockingly connected. Even in this case, the front-rear direction endless wire 40 has the large-diameter portions 40a provided at the two positions thereof, respectively.
The engagement with the cutouts provided in a and 13c prevents the roller support member from slipping.

Here, each endless wire 36
As shown in FIG. 2, the endless wires 36a and 36b are
The relative relationship of being positioned above the front-rear endless wire 40 is particularly suitable for preventing interference between the front-rear endless wire 40 and other constituent members.

According to the interlocking connection structure as described above, the synchronous operation of the power roller 8 can be ensured by the three relatively short endless wires 36a, 36b, 40, so that the wire cost can be reduced. In addition, it is possible to sufficiently prevent a decrease in synchronization accuracy due to the elongation of the wire or the like.

Under the interlocking connection structure, one endless wire 40 in the front-rear direction is attached to the gear housing 3.
1, the gear housing 31 is provided with the gear housing 31 as shown in FIG.
Since it suffices to form one small constricted portion 31a slightly recessed inward, the size of the gear housing itself can be made sufficiently large, and the rigidity of the gear housing can be effectively increased. It should be noted that FIG. 4 shows a state in which the gear housing 31 is bolted to the intermediate wall 1 a of the transmission case 1.

This means that, as shown in the drawing, the constricted portion 31a is provided only on one side of the gear housing 31,
It is more effective if the constriction is completely removed from the other side of it, and furthermore, it is pushed outwards on the other side of the gear housing 31, as shown in phantom in the figure. This is particularly remarkable when the bulging portion 31a is provided.

When the high rigidity is imparted to the gear housing 31 in this way, the deformation of the gear housing 31 due to various forces acting on the gear housing 31 is prevented, the internal gear is not meshed well, and the durability of the gear is deteriorated. It is possible to sufficiently prevent the generation of gear noise.

In addition, in this example, as is apparent from FIG. 3, the power rollers 8 and 9 are directly supported by the power rollers 8 and 9 on one roller supporting member 13a around which the front and rear endless wire 40 is wound. A detecting means for detecting the swinging position of the member 13 and the axial position of the roller support member 13, which is a recess cam 41 in this case, is attached.

According to this, even if any of the power rollers 8 and 9 supported by the roller support member 13 has an abnormal operation, the abnormality can be promptly and accurately detected by only inserting at most two wires. Therefore, it is possible to always perform appropriate shift control and effectively prevent the occurrence of a large abnormality.

Although the present invention has been described with reference to the illustrated example, the recess cam 41 can be attached to the roller supporting member 13c instead of the roller supporting member 13a, and one endless wire 40 in the front-rear direction can be attached. The roller support members 13b and 13d can also be wound around and mounted.

[0041]

As described above, according to the present invention, by using the relatively short three endless wires, the respective power rollers and directly the respective roller supporting members are interlockedly connected, and four wires are used. In comparison with the case where a long wire is used, the synchronization accuracy can be improved, and the rigidity of the gear housing can be maintained sufficiently high.

Regarding the rigidity of the gear housing, when a constricted portion which allows the extension of the front-rear endless wire is provided only on one side of the gear housing, and when the constricted portion swells on the other side portion of the gear housing. It is particularly effective when a section is provided. Further, here, by providing the detecting means on either one of the work supporting members wound with the front-back direction endless wire, it is possible to detect abnormal operation of the power roller quickly and accurately and always perform appropriate shift control. it can.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating an application device of the present invention.

FIG. 2 is a vertical cross-sectional view in a direction orthogonal to the cross section of FIG.

FIG. 3 is a bottom view showing an application example of the present invention.

FIG. 4 is a diagram showing a relative relationship between a gear housing and a front-rear endless wire.

FIG. 5 is a partial cross-sectional schematic line plan view showing an application device of the prior art.

FIG. 6 is a schematic diagram illustrating a conventional technique.

[Explanation of symbols]

1 Transmission Case 1a Intermediate Wall 2,3 Continuously Variable Transmission Unit 4,5 Input Disc 6,7 Output Disc 8,9 Power Roller 10 Spindle 11,12 Ball Spline 13 (13a, 13b, 13c, 13d) Roller Support Member 27 Loading cam 30 Output gear 31 Gear housing 31a Constricted portion 31b Swelling portion 33 Driven gears 36a, 36b Endless wire 37a, 37b, 40a Large diameter portion 39 Notch portion 40 Front-rear endless wire 41 Precess cam

Claims (3)

[Claims] 1. An input disk and an output disk, which are arranged to face each other, and two pairs of two disks, which are arranged on both sides of the disks with the rotation axes of these disks separated from each other and frictionally engage with the facing surfaces of the disks. Two sets of continuously variable transmission units including a power roller are coaxially arranged with their respective output discs in close proximity to each other, and a common gear drivingly connected to them is provided between both output discs. , A gear housing for accommodating the gears is provided, the gear housing is fixed to the transmission case, each power roller is rotatably supported around its axis, and a swing axis line orthogonal to the axis line is provided. A roller support member that supports swinging rotation is provided around each roller support member, and each roller support member swings in synchronization in the same gear shifting direction of each power roller. A toroidal type continuously variable transmission, which is interconnected by interlocking means for ensuring rotation, and in which one roller support member is provided with means for detecting the swinging pivot position of the power roller. Each one endless wire wound around each of the pair of roller support members of the continuously variable transmission unit and each of the two roller support members adjacent to each other in the axial direction of each continuously variable transmission unit. A toroidal type continuously variable transmission, which is composed of one wound front-rear endless wire, and the detection means is provided on either one of the roller support members wound with the front-rear endless wire. 2. The gear housing only on one side of a center plane including the center axis of the gear and parallel to the planes passing through the center axes of the two roller supporting members wound with the front-rear direction endless wire. The toroidal type continuously variable transmission according to claim 1, further comprising a constricted portion inwardly of the gear housing, the constricted portion allowing the extension of the front-rear endless wire. 3. The toroidal type continuously variable transmission according to claim 2, wherein the gear housing is provided on the other side of the center plane with a bulging portion protruding toward the outer side of the gear housing.