JPH07259943A - Continuously variable transmission - Google Patents

Abstract

PURPOSE:To smoothly change the rotational speed ratio, and easily change the rotational speed ratio even in the condition when a pulley is stopped. CONSTITUTION:Pulleys 10, 20 consist of two approximately conical pulley bodies 11, 13 and 21, 23 with their inclined surfaces being opposite to each other. A belt 30 is wound around the pulleys 10,20. The belt 30 consists of two belts (belt bodies) 31, 31. Bodies of revolution 35, 35 are mounted on the surface of the belts 31, 31, and united at several places by uniting members 36. The bodies of revolution 35, 35 are brought into contact with each other. When the radius of contact of the pulley 10 and the belt 30 is changed by changing the space between the pulley bodies 11, 13, the bodies of revolution 35, 35 are rotated and brought into contact with each other, and rotated and brought into contact with the inclined surface of the pulley bodies 11, 13. Similarly, the radius of contact of the pulley 20 and the belt 30 is also changed, and the rotational speed ratio between the pulleys 10, 20 is continuously changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding transmission type continuously variable transmission using a belt and a pulley.

[0002]

2. Description of the Related Art As a means for transmitting the rotational torque of a driving shaft to a driven shaft, there is a winding transmission mechanism that winds a belt around a pulley to transmit power. Further, in the winding transmission mechanism, there is a continuously variable transmission that can change the rotation speed of the pulley infinitely by changing the contact radius of the pulley with the belt.

FIG. 34 is a diagram showing an example of a conventional continuously variable transmission of this type, and FIG. 34 (a) is a schematic perspective view (however, a part of the V-belt 820 is cut away) and FIG. b),
(C) is a plan view.

As shown in the figure, this continuously variable transmission has two sets of conical pulley bodies 801, 801 and 811,8.
Two sets of pulleys 800 and 810 are formed by facing the respective inclined surfaces of the same 11 on the same rotary shafts 803 and 813, and a V belt 820 is wound between the two pulleys 800 and 810. Here one pulley 80
0 can move in the direction of the rotating shaft 803 so that the distance between the two pulley bodies 801 and 801 can be freely adjusted, and the other pulley 810 moves in the direction in which the distance between the pulley bodies 811 and 811 is narrowed by an elastic means (not shown). Being energized.

The rotary shaft 80 of one pulley 800
If 3 is rotationally driven, the other pulley 810 also rotates,
Power can be transmitted to the rotating shaft 813. In this rotating state, if the pulley bodies 801 and 801 are moved in the direction of arrow a shown in FIG. 7B and the distance between them is widened, both pulley bodies 811 and 811 of the other pulley 810 are moved in the direction of arrow b by the elastic means. The interval is narrowed, and a part of the belt slides on the inclined surface of the pulley, whereby the state shown in FIG.
The rotation speed ratio of 3 can be changed steplessly.

In order to increase the strength of the V belt, FIG.
There is also a conventional example using a metal V belt 840 as shown in FIG. The metal V belt 840 is configured by inserting a plurality of metal plate tops 850 between the metal belts 841 and 841 formed by stacking a plurality of strip-shaped metal plates.

By using this metal V-belt 840, it is possible to wind the pulley around the pulley in a state where the tension is considerably increased, so that a large frictional force is obtained.

[0008]

However, the above-mentioned conventional example has the following problems. FIG. 36 shows pulley bodies 801, 801 and V belt 820.
It is a figure which shows the engagement state of. As shown in the figure, the inclined surfaces of the pulley bodies 801, 801 and the side surface of the V-belt 820 are in strong surface contact with each other. Therefore, when changing the position of the V-belt 820, be sure to rotate the pulley 800 while rotating. It has to be done and cannot be done with the pulley bodies 801 and 801 stationary.

Even when the position of the V-belt 820 is changed while rotating the pulley bodies 801, 801, it is difficult to move the V-belt 820 due to friction due to surface contact.

FIG. 37 is a view showing a state in which the rotational speed ratio between the pulleys 800 and 810 is changed. The alternate long and short dash line shown in the figure indicates the initial winding position of the V belt 820,
The dotted line shows the winding position after the change, and the solid line shows the winding position at the start of the change.

As shown in the figure, before the change indicated by the alternate long and short dash line and after the movement indicated by the dotted line, the rotary shaft 803 of the portion of the V belt 820 wound around the pulleys 800, 810.
Since the distance from 813 is constant, a constant rotation speed ratio is obtained in any case. However, in the case of the V-belt 820 that is being changed, the distance from the rotary shafts 803 and 813 of the portion of the V-belt 820 wound around the pulleys 800 and 810 differs depending on the location. Therefore, the V-belt 820 is distorted or the rotational speed ratio is distorted.

As shown in FIG. 36, since both side surfaces of the V belt 820 are in surface contact with the inclined surfaces of the pulley bodies 801, 801, no slip occurs at the central portion c of the side surface of the V belt 820. However, in the upper and lower parts d and e, slippage occurs in the traveling direction of the V-belt 820 due to the difference in the rotation radii, which not only easily wears but also causes a power loss.

The present invention has been made in view of the above points, and an object thereof is to easily change the rotational speed ratio even when the pulley is stationary and to reduce belt wear. To provide a continuously variable transmission.

[0014]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention comprises a pulley which is substantially conical and rotates about a rotary shaft provided in the center thereof, and a belt is provided on an inclined surface of the pulley. In a continuously variable transmission in which the rotation speed of the pulley is changed steplessly by changing the radius of contact of the pulley with the belt, the belt has a surface in a plane substantially perpendicular to the traveling direction of the belt. Or a rotation radius of the belt is configured so that the entire belt rotates in a plane substantially perpendicular to the traveling direction of the belt, and the contact radius of the belt with the inclined surface of the pulley is increased. When changing, the belt was brought into rolling contact in the radial direction of the pulley.

[0015]

When the contact radius of the belt wound around the inclined surface of the pulley is changed, the rotating body attached to the belt or the belt itself makes rolling contact on the inclined surface of the pulley. Therefore, the frictional resistance is small and the belt can be moved smoothly. Even if the rotation of the pulley is stopped, the speed can be changed easily and in an instant. In addition, during shifting, the belt radially expands and contracts its contact radius radially with respect to the inclined surface of the pulley. Therefore, the belt will not be distorted or the rotation speed ratio will not be distorted during the shifting. Unlike the V-belt, it does not make a surface contact with the pulley but makes a point contact, a line contact or a small surface contact, so that an accurate rotation speed ratio can be transmitted, and no slip due to the difference between the inner and outer circumferences occurs. From the above,
There is little loss in power transmission, and energy can be used efficiently.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. [First Embodiment] FIG. 1 is a diagram showing an example of a continuously variable transmission according to the first embodiment. FIG. 1A is a schematic perspective view (however, a part of the belt 30 is cut away), FIG. 3B is a schematic plan view.

As shown in the figure, this continuously variable transmission is constructed by winding a belt 30 around two sets of pulleys 10 and 20. Each component will be described below.

The pulley 10 has two substantially conical pulley bodies 11 and 13 with their inclined surfaces faced to each other, and rotary shafts 15 and 17 fixed to the pulley bodies 11 and 13 slidable in the axial direction and integrally formed in the rotational direction. It is configured to be coupled so as to rotate. At this time, both rotary shafts 15 and 17 are supported by a moving mechanism (not shown) so as to be movable by the same distance in the axially opposite direction (direction of arrow A or B).

Similarly, the pulley 20 is also constructed by connecting the rotary shafts 25 and 27 of the two pulley bodies 21 and 23 so as to be slidable in the axial direction and integrally rotated in the rotational direction. At this time, both rotary shafts 25 and 27 are supported by the elastic members 29 and 29 in a state of being elastically ejected in the direction of arrow C by a predetermined elastic force.

On the other hand, the belt 30 comprises two belt members 31, 3
It consists of 1. 2 is a diagram showing the belt 30,
FIG. 1A is a partially exploded perspective view, and FIG. 1B is a belt body 3.
1 is a side sectional view of FIG. As shown in FIG. 1 and FIG. 1, in the belt members 31 and 31, a large number of cylindrical rotating members 35 are inserted into connecting members 33 and 33 each formed in a ring shape. Then for every two rotating bodies 35)
A bundling member 36 for bundling the two connecting members 33, 33 is attached and configured.

The connecting member 33 is manufactured, for example, by bundling a number of thin wires or by stacking a plurality of thin elastic metal plates so as to be integrated. Its cross-sectional shape is shown in FIG.
As shown in (b), four flat surfaces 37 are provided on the outer peripheral surface of the cylinder, and the four corners 39 are formed in an arc shape.

Then, as shown in FIG. 2A, the connecting member 3
Two rotating bodies 35, 35 are inserted into 3, 33, respectively, and both connecting members 33, 33 are fixed by a binding member 36, and as shown in FIG.
The rotating bodies 35, 35 are attached to the whole. As a result, the rotating bodies 35, 35 attached to the belt bodies 31, 31 come into strong contact with each other.

At this time, the connecting members 33, 33 have 4
Since the two flat surfaces 37 are provided, the binding member 3
By mounting 6, the positions of the connecting members 33, 33 are fixed, and the rotating members 35, 35 do not rotate about the axis in conjunction with the rotation of the rotating members 35, 35.

At this time, as shown in FIG. 2B, a predetermined play is provided between the four arc-shaped corners 39 of the connecting members 33, 33 and the inner peripheral surface of the rotating body 35, and the rotating body 35 is provided. Make it easy to rotate.

The bundling member 36 may be constructed, for example, by providing a metal plate with two holes into which the connecting members 33, 33 can be inserted.

The belt 30 is connected to the pulleys 10 and 2
It is wrapped around 0, but at this time, two belt bodies 31, 31
The outer circumferences of the rotating bodies 35, 35 of the pulley body 11,
It strongly contacts the inclined surfaces of 13, 21, 23.

That is, the rotating bodies 35, 35 of the two belt bodies 31, 31 are in pressure contact with each other and in contact with the inclined surfaces of the pulley bodies 11, 13, 21, 23, respectively.

Next, the operation of this continuously variable transmission will be described. In FIG. 1, when the rotary shaft 15 or 17 is rotationally driven, the pulley bodies 11 and 13 rotate, and the other pulley bodies 21 and 23 and the rotary shafts 25 and 27 thereof are fixed to each other via the belt 30 wound around the pulley bodies 11 and 13. Power is transmitted at a rotation speed ratio of.

Next, as shown in FIG. 3, in order to change the rotational speed ratio, the pulleys 11, 13 on the drive side are moved in the direction of arrow A to narrow the gap between them.
The rotating bodies 35, 35 that are in contact with the inclined surface of No. 3 move in the direction of expanding the radius while rolling contact with the inclined surface in the direction of arrow D on the inclined surface.

On the other hand, the belt 30 wound around the driven side is pulled in the direction of arrow E by this, and the pulley body 2
1 and 23 are arrows F against the elastic force of the elastic members 29, 29.
Direction, and the gap is widened, but at this time, the rotating bodies 35, 35 contacting the inclined surfaces of the pulley bodies 21, 23.
Makes rolling contact on the inclined surface in the direction of arrow G.

That is, when changing the rotation speed ratio, the rotating bodies 35, 35 in contact with the pulley bodies 11, 13 and the rotating bodies 35, 35 in contact with the pulley bodies 21, 23 rotate in opposite directions. At this time, no twist occurs in the connecting members 33, 33 (see FIG. 1) to which the rotating bodies 35, 35 are attached.

Further, in this continuously variable transmission, the rotating bodies 35, 3 are provided on the inclined surfaces of the pulley bodies 11, 13, 21, 23.
Since 5 moves by rolling contact, the friction between the two is extremely small, and even when both pulleys 10 and 20 are stopped, the pulleys 11 and 13 and the pulley body 21 can easily be rotated. , 23 can be changed.

Moreover, the belt 30 is composed of the pulley bodies 11, 1
The pulleys 1 and 2 of the belt 30 can be uniformly spread and narrowed radially with respect to the inclined surfaces of 3, 21, 23.
Rotating shafts 15, 17, 2 wound around 0, 20
The distance (radius) from 5, 27 is always constant, and even if the rotational speed ratio is being changed, the belt 30 and the pulley 1
No strain occurs at 0 and 20.

Further, since the contact between the pulley bodies 11, 13, 21, 23 and the belt 30 is point or line contact, the contact pressure between the belt 30 and the pulleys 10, 20 can be concentrated at the point or line and increased. Yes, and therefore increase friction,
Hard to slip even under high torque load.

Further, since it is a point or line contact and not a surface contact like a V-belt, there is no difference between the inner and outer circumferences of the contact surfaces, an accurate rotation speed ratio can be transmitted, and slip caused by the difference between the inner and outer circumferences does not occur. .

When a conventional continuously variable transmission is used in a transmission of an automobile, when the gear is changed while the engine is rotating at a high speed with the accelerator fully depressed, the pulley and the belt are prevented from slipping during the shifting process. A separate electromagnetic clutch or hydraulic clutch is installed to shift the gear while delaying the shift by sliding the rotation elsewhere, and the engine is running at high speed, but it may not be accelerated in one direction, and power cannot be transmitted. There was a case where the fuel consumption became worse.

However, when the continuously variable transmission according to the present embodiment is used, such a situation does not occur, and the rotation speed ratio is changed in a straight line at a rotation speed ratio that is always suitable for power without delaying the shift in the shifting process. You can accelerate while making it possible to improve fuel efficiency.

[Second Embodiment] FIG. 4 is a diagram showing a continuously variable transmission according to a second embodiment of the present invention. FIG. 4A is a perspective view and FIG. FIG. The same parts as those in the first embodiment are designated by the same reference numerals.

This continuously variable transmission differs from the first embodiment in the shape of the rotating bodies 45, 45 of the belt 40. That is, in this embodiment, as shown in FIG. 7B, the outer peripheral side surface of the rotating body 45 has centers o ₁ and o _{2 of} radii r and r slightly larger than the radius of the arc formed by the inclined surface of the pulley.
2 are provided on both sides of the center line s to form a concave arc surface 47. According to this structure, the pulley bodies 11, 13, 21,
The number of contact points of the 23 with the inclined surface increases to two points (points p and q shown in FIG. 4B), which increases the slip and further enhances the rotation transmission force.

With this construction, the pulley body 11,
Since the convex portions of the 13, 21, 23 and the rotating bodies 45, 45 do not come into contact with each other, they are less likely to be damaged by each other and have good safety.
The transmission force can be increased and the life can be extended. In particular, if an oil film is provided on the contact portion, the contact friction force can be increased due to the traction effect.

Both end surfaces 48, 48 of the rotating body 45 are curved or tapered so that they can be easily bent. Further, two points g and h are provided between the two rotating bodies 45, 45 which are in rolling contact
To prevent slippage and prevent displacement of the rotating body in the direction of rotation.

In this embodiment, the binding member 36
Are attached to every five rotating bodies 45.

The outer peripheral side surface of the rotating body 45 is shown in FIG.
As shown in (a) and (b), a linear inclined surface 49 may be provided instead of the circular arc. Further, as shown in FIG. 5 (c), a large number of inclined surfaces or arcs may be provided, or as shown in FIG. 5 (d), they may be alternately combined.

[Third Embodiment] FIG. 6 is a plan view showing a third embodiment of the present invention, and FIG. 7 is a schematic perspective view thereof. In this continuously variable transmission, teeth 53 are formed on the surfaces of the two belt members 51, 51 forming the belt 50 in the direction in which the belt members 51, 51 roll with respect to the pulley members 61, 63, 71, 73. It is provided and configured. On the other hand, the pulley body 6
Ring-shaped teeth 62, 64, 72, 74 corresponding to the inclined surfaces of 1, 63, 71, 73 are also provided.

The belt members 51, 51 of this embodiment are
Each of them is composed of one ring-shaped member (the rotating body is not attached), and therefore when one of the parts rotates, the other parts also rotate in the same direction. Both belt bodies 5
Between 1 and 51, as shown in FIG. 7, binding members 80 are bound in places.

On the other hand, the space between the pulley bodies 61 and 63 and the space between the pulley bodies 71 and 73 are the same at the same time in the axial direction of the rotary shafts 65 and 66 and the axial direction of the rotary shafts 75 and 76 (direction of arrow Q) by unillustrated moving mechanisms. It is supported so that it can move in any direction. Further, the pulleys 60, 70 are supported so as to be movable in the inter-axis direction (direction of arrow R).

From the state shown in FIG. 6 (a), the pulley body 61, 63 and the pulley body 71, 73 are moved so as to narrow the gap between them at the same time.
When the rotating shafts 75 and 76 are brought closer to the rotating shafts 65 and 66, the belt members 51 and 51 mesh with each other and the teeth 62 and 6 of the pulley members 61, 63, 71 and 73 are engaged.
While also meshing with 4, 72, 74, they move while rotating outward on the inclined surface. At this time, both belt bodies 5
Since both 1 and 51 rotate in the same direction, they are not twisted.

In the case of this embodiment, the radius of the portion of the belt 50 that meshes with both the pulleys 60, 70 is large (in the case of the above-mentioned first and second embodiments), but both pulleys 60 have the same radius. , 70 contacting the belt 50 with different diameters, the rate of change of the radius and the rate of change of the rotational speed ratio are different, so that the rotational speed ratio between the pulleys 60, 70 can be changed.

By the way, the belt body 51 may be provided with a groove 55 for mounting the binding member 80 as shown in FIG. 8A. Further, as shown in FIG.
A large number of gear-shaped rotating bodies 58 may be attached to. Reference numeral 59 in the figure is an engaging projection for preventing the rotating bodies 58 from rotating in different directions, and a recess (not shown) is provided on the back surface of the engaging projection 59. Engagement protrusion 5
It is adapted to engage with 9.

Further, as shown in FIG. 8 (c), a large number of cylindrical rotary members 76, 76 having teeth on their outer circumferences are inserted into the two connecting members 75, 75 to bind them together. Member 77
You may unite with. The rotating body 7 adjacent to each rotating body 76
There is provided an engaging portion 78 for coupling with 6 and rotating in the same direction at the same time, and the binding member 77 is mounted thereon. All the rotating bodies 76 rotate at the same time, but the connecting member 75 does not rotate. However, it may be rotated. Dividing the rotating body in this way improves the flexibility of the belt.

In the embodiment shown in FIGS. 6 and 7, the teeth 53 of the belt members 51, 51 and the pulley members 61, 63, 7 are used.
1, 73 teeth 62, 64, 72, 74 are not provided, the surface of the belt body has a circular cross section, and the pulley bodies 61, 63, 7
The inclined surfaces 1 and 73 may be linear as in the embodiment shown in FIG.

Further, the shapes of the teeth 53 of the belt bodies 51, 51 can be variously modified.

[Fourth Embodiment] FIGS. 9A and 9B are schematic plan views showing a fourth embodiment of the present invention, and FIG. 10 is a schematic perspective view thereof. As shown in the figure, in this embodiment, one belt 85 provided with teeth 87 similar to the belt body 51 shown in FIG. 6 and teeth 91 and 101 similar to the pulley body 61 shown in FIG. 6 are provided. The pulleys 90 and 100 are provided, and the belt 85 is wound around the inclined surfaces of the pulleys 90 and 100 installed in opposite directions.

Here, guide members 110 and 110 that engage with the teeth 87 of the belt 85 to support and guide the teeth 87 are arranged outside the pulleys 90 and 100. The guide members 110, 110 are cylindrical members on the shafts 111, 111 and have rotating members 115, 1 with teeth 113, 113 provided on the surfaces thereof.
It is configured by attaching 15.

When both guide members 110, 110 are moved in parallel in the direction of arrow S from the state shown in FIG. 9A, the belt 85 rotates, as shown in FIG. The winding position around 100 is moved to change the rotation speed ratio between the pulleys 90 and 100.

The rotating member 1 of the guide members 110, 110
15, 115 do not necessarily need to rotate. In this case, the belt 85 slides on the surfaces of the rotating members 115, 115.

In the above embodiment, one guide member is provided for one pulley. However, by providing a plurality of guide members in the circumferential direction of the pulley, the belt can be attached to the pulley. It can be easily held in contact.

[Fifth Embodiment] FIGS. 11A and 11B are views showing a fifth embodiment of the present invention. FIG. 11A is a schematic side view and FIG. 11B is a view taken along line GG of FIG. It is an outline sectional view. In this embodiment, as shown in FIG.
A pulley 120 (having the same structure as the pulley 10 in FIG. 1) similar to that of the embodiment is used, and the other is used as an external gear 130. The rotation shaft 121 of the pulley 120 and / or the rotation shaft 131 of the gear 130 are
It is configured to be movable in the arrow H direction.

On the other hand, the two belt members 141 and 145 constituting the belt 140 have the connecting member 1 as in the first embodiment.
A large number of rotating bodies 143 and 147 are rotatably attached to the 42 and 146. And this connecting member 14
2, 146 are fixed by a plate-shaped binding member 150. This bundling member 150 is arranged such that one or several rotating bodies 14 and 147 are separated by a predetermined distance.
A large number of sheets are attached to the connecting members 142, 146 with the sheet 3, 147 interposed therebetween. Each of the binding members 150 includes the gear 130.
Tooth 151 that meshes with is provided.

When the gear 130 is driven, the teeth 151 mesh with it, the belt 140 rotates, and the pulley 1
20 rotates. When the rotation speed ratio of the pulley 120 is changed, the distance between the two pulley bodies forming the pulley 120 may be changed. Also at this time, the rotating body 143,
Since 147 moves while rolling on the inclined surfaces of the two pulley bodies, the rotation speed ratio can be changed smoothly. At this time, the pulley 120 or the gear 130 moves in the arrow H direction.

According to this structure, slippage on the gear 130 side is eliminated, so that more power can be transmitted more reliably.

In this embodiment, as shown in FIG.
Belt 16 wrapped around two pulleys 160, 162
Various modifications are possible, such as meshing the gear 166 in the middle of step 4, or providing the coupling member with teeth meshing with the gear.

Other Embodiments (1) FIG. 13 shows a pulley 170 of another shape used in the present invention.
FIGS. 7A and 7B are front views showing a pair of pulley bodies 171, 175, FIG. 7C is a side view of a main portion of the pulley 170, and FIG. FIG. 3E is a schematic view of a main part showing a state in which the belt 180 is wound around the pulley 170, and FIG. 6E is a schematic cross-sectional view showing the structure of the belt 180 wound around the pulley 170.

As shown in the figure, the pulley body 171,
The inclined surface of 175 is provided with a groove 172 and a protrusion 176 extending in the radial direction. And the groove 172 and the protrusion 17
6 are arranged at opposite positions, as shown in FIG.

A belt 180 having the same structure as shown in FIG. 1 is wound around the pulley 170. However, in the case of this belt 180, the rotating member 18
A play is provided between the two so that the one can be shifted to the left or right a little. Therefore, as shown in FIG. 7D, the rotating body 181 can be slightly eccentric with respect to the connecting member 183 at the portion where the groove 172 and the protrusion 176 face each other. At this time, the connecting member 183 does not deform. With the above configuration, the frictional force between the pulley 170 and the belt 180 is increased, and the power that can be transmitted can be increased.

As shown in FIG. 7E, the connecting member 1
If 83 is formed into a substantially elliptical shape, and the gap between the upper and lower portions thereof and the rotating body 181 is S1 and S1, and the gap between the left and right portions thereof and the rotating body 181 is S3 and S3, there is almost no vertical play, This is preferable because it has a structure with sufficient play.

(2) FIG. 14 is a view showing another method of winding the belt 194 around the pulleys 190 and 192. That is, as shown in the figure, when the belt 194 is wound around the two pulleys 190, 192, the two rotary wheels 196, 1
98 may be interposed. With this configuration, for example, when the radius of the belt 194 wound around the pulley 190 on one side is increased and the radius of the belt 194 wound around the pulley 192 on the other side is decreased at the same time, the belt 19
The rotation directions of 4 (indicated by arrows in the figure) can be the same.

Therefore, in the case of this embodiment, it is not necessary to attach a large number of rotating bodies capable of rotating in opposite directions as in the first embodiment (though this may be done). That is, the belt 194
May be composed of, for example, two integrated belts each having a circular cross section.

(3) Two belts may be doubly wound around the pulley. At this time, for example, as shown in FIG.
A guide member 205 is attached in order to keep the two belts 201 and 203 in contact with the inclined surface of the pulley body 200. The guide member 205 is configured by attaching a rotating member 206, which is cylindrical on the shaft 207 and has a guide groove 209 provided on the surface thereof.

(4) As shown in FIG. 16, the two belt bodies 211 and 213 may have different diameters.

(5) The belt material is metal, resin,
Various materials such as rubber or a combination thereof can be used. Inside the belt, wires, metal plates, cloth,
You can improve tensile strength by inserting various core materials such as chains and joints. When the binding member shown in FIG. 1 is used and the various core members are used as the connecting member, the core member is not rotated. Also, when various core materials are used as the connecting members which are members that are easily bent in the vertical and horizontal directions, the core materials may be rotated, and the holes of the binding members may be rotatably provided. On the other hand, a belt body 51 as shown in FIG.
When used as the core material of 51, this core material also rotates.
Further, grooves may be provided on the surface of the belt, or a soft or hard coating may be applied.

(6) A magnetic material may be provided on either or both of the belt and the pulley, and the contact force and frictional force between the two may be increased by the attraction of the magnetic material.

(7) As shown in FIG. 17 (a), the belt 220 may be constructed by attaching a spiral rotator 223 to the outer periphery of the connecting member 221, or as shown in FIG. 17 (b). The belt 230 may be configured by connecting bendable universal joints.

(8) As shown in FIG. 18 (a), the side surfaces of a large number of rotating bodies 240 may be concave and convex curved surfaces (the connecting members are not shown in this figure). Further, as shown in FIG. 8B, a plurality of rotating bodies 250 may be provided with projections 251 and engaging recesses 253, and both may be sequentially connected.

(9) The connecting member 33 of the first embodiment shown in FIG.
A member having high hardness or hard to wear may be attached between the rotor and each of the rotating bodies 35, or a bearing may be attached to prevent the rotating body 35 from being worn during rotation.

(10) As shown in FIGS. 19A to 19C, protrusions 261 and 266 are provided on the inner peripheral surface of the rotating body 260 or the outer peripheral surface of the connecting member 265 to make point contact or line contact between them. You may make it contact a small area.

(11) As shown in FIG. 20, the chain 27
Rotation center shafts 272, 27 of the rotating body 275 attached to 0
3 may be different from each other. With this configuration,
The rotating body 275 is 1 with respect to both pulley bodies 281 and 283.
We contact each other. It should be noted that instead of the chain 270, another member may be used and the rotating shaft of the rotating body 275 may be biaxial.

(12) A continuously variable transmission having a structure in which the entire belt body 51 is integrally rotated as in the embodiment shown in FIG. 7 (FIG. 9).
The belt 85 having the structure shown in FIG. The teeth 53 of the belt body 51 may be omitted. ), In FIG.
As shown in (b), the belt member 280 has a connecting member 281.
The disk body 283 may be integrally formed. See also FIG.
As shown in FIGS. 1 (c) and 1 (d), the coupling member 285 and the disc body 287 may be engaged with each other in a shape other than a circular shape so that the disc body 287 rotates integrally with the coupling member 285.

(13) As shown in FIG. 22, the connecting member 29
The rotating body 295 attached to 0 has two rolling contact portions 2
It is also possible to use an integrated structure of 96 and 297. Reference numeral 298 shown in the figure is a seat provided at the end of the rotating body 295 for mounting the binding member 292 thereon. Further, the binding member may be attached to the outer circumference of the rotating body within a range in which the binding member does not contact the pulley.

A bearing may be provided on the seat 298 to reduce the frictional resistance with the binding member 292. Again seat 29
By providing a circumferential projection on the outer peripheral surface of 8, or by providing a circumferential projection on the inner peripheral surface of the binding member 292,
The contact between the seat 298 and the binding member 292 may be point or line contact to reduce the frictional resistance between them.

As shown in FIG. 23, the rotary members 301,
Even if the projections 302, 302 are provided on the side surface of 301 and the projections 302, 302 are brought into point or line contact with the side surface of the binding member 310, the frictional resistance between them can be reduced. Conversely, protrusions may be provided on both side surfaces of the binding member 310.

(14) As shown in FIG. 24 (a), the bundling member 320 includes two connecting members 321 and 323 on one plate.
Alternatively, holes 325 and 327 may be provided so as to pass through.
When it is desired to separate the two rotary bodies as in the embodiment shown in FIG. 11, the holes 341 and 343 of the binding member 340 may be widened as shown in FIG.

(15) The binding member may be fixed to the connecting portion. Various fixing means such as welding and bolting are used for fixing. With this configuration, the connecting portion does not rotate even when the rotating body rotates, and is not twisted. For example, FIG. 25 (a)
As shown in, the binding member 351 may be directly fixed to the coupling member 350. When the rotation center axis of the rotating body is biaxial as in the embodiment shown in FIG. 20, the coupling member 355 itself is deformed as shown in FIG. The axis may be biaxial. Further, as shown in FIG. 26, the two rows of chains 361 and 363 may be connected by a binding member 365.

Also, as shown in FIG. 27, a binding member 370.
It is also possible to provide two holes 371 and 371 other than the circular shape in the above and allow the connecting members 373 and 373 having the same cross-section to penetrate therethrough.

(16) In the fifth embodiment (FIGS. 11 and 12), one pulley is replaced with a gear, or a continuously variable transmission having a structure in which a gear is engaged in the middle of the belt is shown. Other types of belts for continuously variable transmissions include the following.

FIG. 28 shows a belt of this type.
That is, as shown in FIG. 7B, a belt 380 having a gear engagement gap 382 between the rotating bodies 381 is prepared.
The belt 380 may be directly meshed with the gear 383 as shown in FIG.

Further, as shown in FIG.
3 is attached to the outer periphery of the chain 391, each rotating body 3
A gap portion 395 of the chain may be provided between 93, and the teeth of the gear 397 may be meshed with the gap portion 395.

Further, as shown in FIG.
A gap portion 403 for gear meshing is provided between the two rows of chains 400, 400 to which the gear 1 is attached.
A gear may be meshed with 03.

Further, the gears may be meshed with the portion of the binding member by setting the spacing between the binding members as the spacing of the gears.
Further, the ring-shaped connecting member may be provided with interference portions such as irregularities at gear intervals, and the gears may be meshed with the interference portions.

Further, as shown in FIG.
The support member 41 in which the timing belt 413 is attached to the center of the connecting members 410 and 410 in two rows
5, and a gear may be meshed with the timing belt 413.

(17) The pulley 10 shown in FIG. 1 may be used as the pulley, and the belt 50 having a groove in the traveling direction as shown in FIG. 7 may be used as the belt. In this case, FIG.
As shown in FIG.
The two points 5 contact each other, and the frictional force can be increased.

(18) The outer peripheral shape of the rotating body is shown in FIG.
As shown in (d) to (d), if unevenness is provided and meshed with each other, deviation of the rotating body in the belt traveling direction can be prevented.

(19) An oil film may be provided between the belt and the pulley that are in contact with each other, and high frictional force generated by applying high pressure to the oil film may be used for driving (traction drive).

(20) As shown in FIG. 31, the inclined surfaces of the pulley bodies 431 and 431 around which the belt is wound may be provided with unevenness extending in the radial direction. This can increase the frictional force with the belt. If the number of the irregularities is increased,
Effective because it increases the number of contact points with the belt.

(21) The shape of the outer peripheral side surface of the rotating body can be variously modified. For example, it may be formed in a convex shape (a drum shape) as shown in FIG. 32 (a), or in the same figure (b). 2 may be provided, or conversely, it may be formed in a concave shape having a radius of curvature larger than the radius of curvature of the pulley body as shown in FIG. Further, the outer peripheral side surface shape of the rotating body may be various shapes other than these.

(22) The pulley 170 (pulley bodies 171, 175) shown in FIG. 13 is attached to the pulley 60 shown in FIG.
(Pulley bodies 61, 63) may be applied. FIG. 33
(A) and (b) are the pulley bodies 441 and 44, respectively.
3 is shown. Grooves 442 and protrusions 444 extending in the radial direction are formed on the inclined surfaces of both pulley bodies 441 and 443, respectively.
And ring teeth 445, 445 on both sides.
Is provided. At this time, a belt 50 as shown in FIG. 7 is used as the belt. With this configuration,
The advantages of both embodiments can be exhibited.

The input shaft of the continuously variable transmission of the present invention may be provided in a prime mover such as a motor or an engine, or the output shaft may be provided in a follower.

Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications can be made within the scope of the gist of the present invention, and these are excluded from the present invention. is not.

[0099]

As described in detail above, the continuously variable transmission according to the present invention has the following excellent effects. The contact radius of the belt wound around the inclined surface of the pulley can be easily and steplessly changed, and the rotation speed ratio of the pulley can be easily changed.

When the contact radius of the belt wound around the inclined surface of the pulley is changed, the rotating body attached to the belt or the belt itself makes rolling contact on the inclined surface of the pulley, so that the frictional resistance is small and the movement of the belt is small. Even if the rotation is smooth and the pulley rotation is stopped, the rotation speed ratio can be easily and instantaneously changed.

Further, during the shifting, the belt radially expands and contracts the contact radius with the inclined surface of the pulley smoothly, so that the belt is distorted during the shifting or the rotational speed ratio is distorted. There is no such thing.

Since it is not a surface contact like the V-belt,
An accurate rotation speed ratio can be transmitted, and slip due to the difference between the inner and outer circumferences does not occur.

There is little loss in power transmission, and energy can be used efficiently.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a continuously variable transmission according to a first embodiment of the present invention, in which FIG. 1 (a) is a schematic perspective view and FIG. 1 (b).
Is a schematic plan view.

2 is a diagram showing a belt 30, FIG. 2A is a partially exploded perspective view, and FIG. 2B is a side sectional view of a belt body 31.

[FIG. 3] Pulleys 10 and 2 when changing the rotation speed ratio
It is a figure which shows the state of 0 and the belt 30.

4A and 4B are views showing a second embodiment of the present invention, in which FIG. 4A is a perspective view and FIG. 4B is an enlarged view of a main part of a belt 40.

FIG. 5A to FIG. 5D are diagrams showing another rotating body.

6 (a) and 6 (b) are plan views showing a third embodiment of the present invention.

FIG. 7 is a schematic perspective view of a third embodiment.

8A, 8B, and 8C are views showing a belt and a belt body having another structure.

9A and 9B are schematic plan views showing a fourth embodiment of the present invention.

FIG. 10 is a schematic perspective view of a fourth embodiment.

FIG. 11 is a diagram showing a fifth embodiment of the present invention, in which FIG. 11 (a) is a schematic side view and FIG. 11 (b) is GG in FIG. 11 (a).
It is an outline sectional view.

FIG. 12 is a schematic side view showing a modified example of the fifth embodiment.

13 (a) and 13 (b) are front views showing a pair of pulley bodies 171 and 175 according to another embodiment, FIG. 13 (c) is a side view of a main part of the pulley 170, and FIG. 8A is a schematic view of a main part showing a state where the belt 180 is wound around the pulley 170, and FIG. 8E is a schematic sectional view showing the structure of the belt 180 wound around the pulley 170.

FIG. 14 is a view showing another method of winding the belt 194 around the pulleys 190 and 192.

FIG. 15 is a schematic side view of an essential part showing a winding state of a pulley and a belt of another embodiment.

FIG. 16 is a schematic plan view of another embodiment.

17 (a) and 17 (b) are views showing a part of a belt of another embodiment.

18 (a) and 18 (b) are views showing a part of a belt of another embodiment.

19 (a) to 19 (c) are cross-sectional views of a main part showing an engaged state of a rotating body and a connecting member according to another embodiment.

FIG. 20 is a schematic view of a main portion showing another embodiment.

21A to 21D are diagrams showing belts according to other examples.

FIG. 22 is a perspective view of essential parts showing a belt according to another embodiment.

FIG. 23 is a cross-sectional view of main parts showing the structure of a belt according to another embodiment.

24 (a) and 24 (b) are views showing a belt according to another embodiment.

25 (a) and 25 (b) are partial perspective views showing a belt according to another embodiment.

FIG. 26 is a diagram showing a part of a belt according to another embodiment.

FIG. 27 is a perspective view showing a part of a belt according to another embodiment.

28 (a) to 28 (e) are diagrams showing belts according to other examples.

FIG. 29 is a diagram showing an engaged state of a pulley and a belt of another embodiment.

30 (a) to 30 (d) are side views showing a rotating body according to another embodiment.

FIG. 31: Pulley bodies 431, 43 according to another embodiment
It is a side view showing 1.

32 (a), 32 (b) and 32 (c) are side views showing a rotating body according to another embodiment.

33 (a) and 33 (b) are views showing pulley bodies 441 and 443 according to another embodiment.

FIG. 34 is a diagram showing an example of a conventional continuously variable transmission, FIG. 34 (a) is a schematic perspective view, and FIGS. 34 (b) and 34 (c) are plan views.

FIG. 35 is a diagram showing another example of a conventional continuously variable transmission,
The figure (a) is a schematic perspective view, and the figure (b) is a metal V-belt 8.
It is a figure which shows 40.

FIG. 36 is a diagram showing an engaged state of a pulley 800 and a V belt 820.

FIG. 37 is a diagram showing a state when changing the rotation speed ratio between the pulleys 800 and 810.

[Explanation of symbols]

 10, 20 Pulley 11, 13, 21, 23 Pulley body 15, 17, 25, 27 Rotating shaft 30 Belt 31 Belt body 33 Connecting member 35 Rotating body 36 Bundling member

Claims (8)

[Claims] 1. A pulley having a substantially conical shape and rotating about a rotating shaft provided at the center thereof, wherein a belt is wound around an inclined surface of the pulley and a contact radius of the pulley with the belt is changed. In a continuously variable transmission that continuously changes the rotational speed of a pulley, the belt is configured by attaching a rotating body that rotates in a plane substantially perpendicular to the traveling direction of the belt on its surface,
Alternatively, the entire belt is configured to rotate in a plane substantially perpendicular to the traveling direction of the belt, and when the contact radius of the belt with the inclined surface of the pulley is changed, the belt is moved in the radial direction of the pulley. A continuously variable transmission characterized in that it makes rolling contact. 2. The pulley comprises two pulleys each having a substantially conical shape, with their inclined surfaces facing each other on the same axis of rotation, and further comprising two belts to which the rotor is attached. When the rotating bodies of the belt are brought into contact with each other and are brought into contact with the inclined surfaces of different pulley bodies respectively, and when the gap between the pair of pulley bodies is changed to change the contact radius of the pulley and the belt, 2. The continuously variable transmission according to claim 1, wherein the rotating bodies of the belts of the book make rolling contact with each other and simultaneously make rolling contact with the inclined surface of the pulley body. 3. The pulley comprises two pulleys each having a substantially conical shape, with their inclined surfaces facing each other on the same rotating shaft, and further comprising two belts to which the rotating body is attached. The rotating bodies of the belts are brought into contact with the inclined surfaces of different pulley bodies, and the two belts are bundled by a binding member, and the gap between the pair of pulley bodies is changed to change the contact radius between the pulleys and the belt. 2. When changing, the rotating bodies of the two belts make rolling contact with the inclined surface of the pulley body.
The described continuously variable transmission. 4. The continuously variable transmission according to claim 1, wherein teeth are provided on a surface of the belt in a direction in which the belt rolls with respect to a pulley. 5. The belt is attached to a ring-shaped connecting member that is wound around the pulley, and is attached to the outer periphery of the connecting member so as to rotate independently in a plane substantially perpendicular to the traveling direction of the belt. The continuously variable transmission according to claim 1, 2 or 3 or 4, wherein the continuously variable transmission is constituted by a plurality of rotating bodies. 6. The stepless belt according to claim 1, wherein the belt is provided with teeth which are uneven in a traveling direction thereof, and gears are meshed with the teeth. transmission. 7. A substantially conical shape, which is wound around an inclined surface of a pulley that rotates about a rotation shaft provided in the center thereof,
In a belt in which the rotation speed of the pulley is changed steplessly by changing the contact radius of the pulley with the belt, the surface of the belt is a rotating body that rotates in a plane substantially perpendicular to the traveling direction of the belt. A belt characterized by being attached. 8. A pulley having a substantially conical shape, which is rotated about a rotation shaft provided at the center thereof and whose rotation speed is changed by changing a contact radius with a belt wound around the inclined surface, A pulley characterized in that an inclined surface of the pulley is provided with teeth that are uneven in the radial direction of the pulley.