JP2011163551A - Load sensitive continuously variable transmission by width variable belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a load gets excessively great in a gear ratio of a high speed gear to be difficult in start by actuating a pedal, when a vehicle stops under the condition where the gear ratio is brought into the high gear ratio during travel at the high gear ratio, in a multi-stage gear type transmission of a bicycle, a problem wherein the gear ratio must be set to restore a low-speed gear suitable for the start, a problem where a pedal is required to be rotated under the state where a rear wheel floats up from a ground face, for switching the gear ratio, and a problem wherein a shift gear is difficult to be switched because a chain is meshed with a gear at strong tension in an ascending slope. <P>SOLUTION: A belt comprising an elastomer of varying a width by a tension due to a load rotating a wheel is wound onto a driven pulley and a driving pulley of deep bottom, the belt with the width varying by the tension moves between a bottom side narrow in a V groove width of the driving pulley and an outer circumferential side of wide V groove width, by an elastic force of the belt, and a ratio of an effective diameter to that of the driven pulley varies because a circular arc diameter varies in every moving, in this load sensitive continuously variable transmission by the width variable belt of the present invention. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a bicycle transmission.

Conventionally, in a bicycle transmission, a plurality of chain wheels with different numbers of teeth are arranged side by side on the drive chain wheel on the pedal side and the driven chain wheel on the rear wheel side, and the chain is hung between the driven gear and the drive gear. The gear was shifted by changing the gear with a different number of teeth by moving the chain sideways with the chain guide.

The ratio between the drive chain wheel and the driven chain wheel was fixed, and a planetary gear or the like was incorporated in the rear wheel hub, and the gears were switched by tilting the claws with a wire or the like to change the gear.

Some bicycles use a transmission method using a timing belt and a timing pulley in addition to the chain to transmit the drive, but the speed change was not possible with the timing belt.

For example, in the field other than bicycles, in the case of continuously variable transmission using a belt, as shown in FIG. 21, the movable side plate 100a of the drive pulley is moved away from the fixed side plate 100 in the direction of the arrow A103, and as shown in FIG. By moving the movable side plate 101a parallel to the axis in the direction of the fixed side plate 101, which is the direction of the arrow B104, and changing the V-shaped groove width, the winding arc diameter of the V belt 8 becomes the drive pulley in FIG. Since the width of the V pulley formed by 100a is narrow, the V belt 8 is close to the outer periphery of the pulley and takes a large arc, and the driven pulley in FIG. 22 has a wider V pulley formed by the fixed side plate 101 and the movable side plate 101a. Therefore, the V-belt 8a is lowered in the direction of the shaft 102 and has a small arc diameter. By changing the widths of the drive pulley FIG. 21 and the driven pulley FIG. 22 according to the load, the winding arc diameter of the V-belt 8 continuously changes, and stepless speed change is possible. The force is transmitted by the rotational friction by the side pressure friction between the belt 8, the side surface 26, the fixed side plates 100 and 101, and the movable side plates 100 a and 101 a.

Referring to FIG. 21, when tension is applied when the core wire 24 is arranged on the inner bottom 43 side of the belt, the V belt 8 draws an arc diameter between the side surface 26 of the belt and the inner surface 6 of the pulley at the same angle. Therefore, the central portion of the belt is pulled in the direction of the shaft 102 due to the tension of the core wire and is warped, whereby the angle of the side surface 26 of the belt 8 is changed and normal force cannot be transmitted. In order to prevent this, the core wire 24 is buried over the entire width of the belt in the vicinity of the back side 42 from the upper and lower centers of the belt. Thus, the conventional belt does not expand and contract in the longitudinal direction even when tension is applied. Even if the V belt 8 is pressed against the fixed side plate 100 of the V pulley and the inner side surface 6 of the movable side plate 100a, the cross section of the belt 8 is deformed so that the angle does not change and the width does not change. Is formed.
As described above, there is a CVT continuously variable transmission using a V belt, wherein the groove width of the V pulley changes. For example, in Japanese Patent Application Laid-Open No. 2001-099235, as a means for improving the side pressure resistance, the cut yarn in the rubber is oriented in the belt width direction to improve the side pressure resistance.
In addition, a cord is embedded so as not to expand and contract in the direction of a longitudinal endless ring (hereinafter referred to as endless) that hangs on the drive gear and the driven gear.

Further, as a means of light transmission belt transmission, there is a transmission method using a round pulley and a high hardness polyurethane round single belt.

There were the following problems. (Hereinafter, the chain wheel is referred to as a gear) The force required to step on the pedal 4 to travel or start is small. The stepping force is greater but faster than the gear ratio between the driving side and the driven side (hereinafter referred to as low gear). If the running gear ratio is stopped without switching to the low gear ratio at the drive-driven and driven-side gear ratio (hereinafter referred to as high gear), the gear ratio has a large force to step on the pedal 4. It was difficult to start because it was in the required high gear ratio, and it was not possible to start with normal power, especially when it was an uphill.

In order to solve this problem and start, it was necessary to switch the gear ratio to a low gear. To change gears while stopped, if there is a speed change mechanism on the driven side, switch the gear ratio with the lever on the handle, etc., then raise the stand and tilt it forward with the stand of the car body as the fulcrum. In an unstable state where the wheel was lifted off the ground, the pedal had to be turned several times to move the chain to a gear with more teeth, that is, a larger diameter than the currently engaged gear.

Also, if there is something heavy in the shopping basket attached to the handlebars, if the gear ratio remains high, the bicycle will stagger to step on the pedal with a strong force, so it may be dangerous to jump out onto the roadway. It was.

In addition, since the chain is pulled strongly on the drive side and is strongly engaged with the driven gear, the gear ratio is reduced even if the switching operation is performed. It was difficult to switch to the ratio. To change the gear ratio, it is necessary to prevent tension from being applied to the chain until several chains on the driven shaft and several aligned gears are moved to a gear with a large number of teeth across the diameter. However, it was very difficult to step on the pedal so as not to apply tension, so there was a case where shifting was not possible.

The planetary gear transmission installed in the rear wheel hub uses a planetary gear, and the gear change is reduced by defeating the claw on the ratchet in the hub, but the pedal has a large stepping force. It was difficult to decelerate on the uphill because I couldn't defeat the claws and was temporarily waiting for the claw to fall, either by losing the pedal force or by weakening it.

In the case of the transmission method using the timing belt and the timing pulley, there is no transmission loss, and the transmission cannot be performed by the combination of the timing belt and the timing pulley. In the case of a round belt, since it is a single unit without a core wire, the belt of the present invention has high lateral pressure resistance in the lateral direction of the belt because it has high hardness and elastic force to prevent expansion and contraction in the endless direction. Cannot be used.

The CVT continuously variable transmission mechanism for changing the width of the V pulley is complicated and large, and the cost is not suitable for the bicycle.
The present invention is intended to solve the above problems.

Means to solve the problem

The present invention is based on the concept of reverse rotation, and the inner width of the V groove 44 of the driving V pulley 5 (hereinafter referred to as driving pulley) is fixed without changing, but the driven pulley 19 of the rear wheel spanning the belt 8 is rotated. The belt 8 whose width changes according to the tension generated by the load of the belt is wound around the V groove 44 of the V-shaped driving pulley 5 and the groove 20 of the driven pulley 19 with a fixed width, and the power is transmitted. To do. The shape of the groove 20 is matched with the cross-sectional shape of the belt 8. The effective diameter of the driven pulley 19 with which the belt 8 is brought into frictional contact is set larger than the minimum effective diameter of the drive pulley 5 and smaller than the maximum effective diameter of the drive pulley 5.

5, the belt 8 showing an endless shape bends inward and outward, but the core wire 24 does not expand or contract in the endless direction (refer to FIGS. 4 and 5 and the direction of the arrow 46) even when subjected to tension. Is buried in the belt 8 in the entire length in the endless direction, and the core wire 24 is buried in the lower direction from the upper and lower centers of the belt and in the vicinity of the inner bottom 43 of the belt so as not to disturb the change of the width when tension is applied. See FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG.

In the direction perpendicular to the endless direction (hereinafter referred to as the lateral direction), it is desirable that the rubber hardness representing the elastic force at this time is 50 degrees or less. .
Referring to FIG. 1, the tension applied to the belt 8 presses the side surface 26 of the belt 8 against the inner surface 6 of the V pulley 5, the reaction force is applied to the inner surface 6 of the V pulley 5, and the stress is applied to the inside of the belt 8. Since the belt 8 is formed of an elastic body, the belt 8 receives reaction force (hereinafter referred to as external force) generated on the inner surface 6 of the V pulley 5 from both sides in the belt center upward direction, and the external force acting on the belt. Is greater than the elastic force at the current position of the belt, the belt width is elongated longitudinally and the belt 8 moves toward the center of the V pulley 5 toward the crankshaft 2 and the arc position where the external force and the elastic force of the belt 8 are balanced. As a result, the arc diameter becomes smaller and the belt 8a is held.

The belt 8 has an arc diameter smaller than the maximum arc diameter at the position of the drive pulley 5, and if the external force becomes smaller than the elastic force of the belt 8 at that time, the belt 8 tries to return to the original shape formed. With this elastic force, the drive pulley 5 starts to move in the outer peripheral direction and is held at the arc position where the external force and the elastic force of the belt 8 are balanced. At this time, the inner side surface 6 of the driving pulley 5 is in friction with the side surface 26 of the belt 8, and the belt 8 has entered the driving pulley 5 from 9 o'clock to 12 o'clock. The force to push up acts on the belt 8 to help the belt 8 smoothly move in the outer peripheral direction of the drive pulley 5. FIG. 4 illustrates some aspects of the present invention, which are divided into items.

The belt 8 that hangs around the drive pulley 5 and the driven pulley 19 is embedded in the belt so that the belt 8 does not expand and contract in the endless direction, and the core wire 24 is embedded in the vicinity of the inner bottom 43 of the belt 8.
For the core wire, woven fabric such as aramid fiber, high-tensile tetron, polyester, Kepler, rope or non-woven fabric, etc. which has tensile strength and excellent flexibility is used.
See FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 11, FIG.

The belt 8 approximates to rubber or vulcanized rubber so that the cross-sectional shape is deformed in the upper direction of the center of the belt 8 in accordance with the external force from the side surface 26 of the belt, the width of the belt changes and the belt 5 can move toward the center of the pulley 5. It is made of an elastic resin, TPE (Thermo Plastic Elastomer) thermoplastic elastomer resin. See FIG. 1, FIG. 3, FIG. 15, FIG. 16, FIG.

In this manner, the core wire 24 does not expand or contract even if tension is applied in the endless direction. However, if tension is applied to the belt, both of the V pulley 5, the inner surface 6 and both of the belt, and the side surface 26 are counteracted by external force. If force and stress are generated and the external force is larger than the allowable stress level of the belt, that is, the elastic force, the width of the belt is narrowed, and the cross-sectional deformation extending upward is caused. The movement in the direction of the crankshaft 2 is started. The belt 8 is held on both the inner surfaces 6 of the V pulley 5 at a position where the external force generated from the tension applied to the belt 8 and the stress (elastic force) at the time when the cross section of the belt is deformed are equalized to form a belt 8a. FIG. FIG. FIG. FIG. FIG. FIG. See FIG.

When the belt 8 has the hollow portion 9, in order to maintain the shape, a spiral, ring-shaped, or U-shaped core wire 21 is arranged so as to intersect the core wire 24 at an interval, and the side surface 26 of the outer cover surface is disposed. An anti-slip groove 27 perpendicular to the surface is provided. FIG. FIG. See Fig. 8

Further, the inner surface 6 of the driving pulley 5 is provided with unevenness 7 by sandblasting or the like for eliminating noise and preventing slipping when the belt 8 moves. See Figure 1

Further, the belt 8 is formed of a plurality of layers of materials 8c and 8b having different elastic forces, the core wire 24 is embedded therein, and a groove 27 is provided in the jacket. See FIG. 7 and FIG.

Moreover, it is made of the same elastic body, the core wire 24 is embedded, a groove 27 is provided in the jacket, and the cut 41 extends from the back side 42 of the belt 8 to the inner bottom 43 of the belt 8 and close to the core wire 24. To improve flexibility. See FIG.

The internal pressure of the hollow portion 9 of the belt 8 is increased by air or gas so that the width of the belt 8 due to external force can be changed quickly and the elastic force of the belt material can be compensated. See FIG.

The V-belt (JIS K 6323) normally does not expand and contract in the endless direction, and even when an external force is applied from the side surface (26), the belt width becomes narrow and the V angle of the belt does not change, that is, the cross section does not deform. In this way, it is reinforced with a core wire 24, a jacket cloth 22 and the like, and is characterized by being difficult to expand and contract both in the endless direction and in the lateral direction of the belt. See FIG.

The present invention does not expand and contract in the endless direction, but by providing elasticity in the width direction of the belt, the side surface (26) of the belt is deformed in accordance with the external force and the belt width is changed by changing the belt width. This is a load-sensitive continuously variable transmission using a variable width belt that continuously takes an arc diameter corresponding to an external force at the V groove 44.

The invention's effect

The belt 8 is formed of an elastic body that deforms in the lateral direction of the belt when an external force of a certain level or more is applied to the side face 26 but returns to its original shape when unloaded. However, since the core wire 24 is embedded in the entire length in the endless direction, it does not expand and contract.

The basic principle of the present invention will be described with reference to FIGS.
First, as shown in FIG. 4, power is transmitted by winding a belt 8 around a drive pulley 5 fixed to a pedal 4 and a crankshaft 2 engaged with a crank 3 and a driven pulley 19 fixed to an axle of a rear wheel. There is no. The effective diameter of the driven pulley 19 is set larger than the minimum effective diameter of the driving pulley 5 and smaller than the maximum effective diameter of the driving pulley 5.

When the belt 8 moves in the direction of the crankshaft 2 of the drive pulley 5 (hereinafter referred to as the center) due to an increase in tension, the wrapping arc diameter decreases and the belt sags. In order to eliminate this sag, the drive pulley 5 A tension pulley is arranged later. The fixed tension pulley 13 is attached so as to operate on the tension 10 shaft. The tension shaft 10 is held so that the support tool 11 and the kick spring 12 are rotated, and the kick spring 12 is hooked on the support tool 11. A rotating tension pulley 14 is gripped by the shaft of the support 11 so as to rotate, and the action of the kick spring 12 makes it possible to rotate clockwise with the tension 10 shaft as a fulcrum. The belt 8 passing between the dynamic tension pulleys 14 is bent to take up slack.

Further, the principle of belt movement will be described with reference to FIG.
The tension applied to the belt 8 presses the side surface 26 of the belt 8 against both the drive V pulley 5 and the inner surface 6, a reaction force is generated on the inner surface 6 of the V pulley 5, and a stress is generated inside the belt 8. The belt 8 is formed of rubber or a thermoplastic elastomer resin having elasticity similar to that of vulcanized rubber. The belt 8 receives external force generated on the inner surface 6 of the V pulley 5 from both sides in the belt center upward direction. When the external force acting on the belt 8 expands and contracts in the lateral direction and exceeds the elastic force at the current arc diameter position of the driving pulley 5 of the belt 8 made of an elastic body having an elastic force, the belt width is elongated in the longitudinal direction and the belt 8 is deformed. At the circular arc position where the external force and the elastic force (stress) of the belt 8 are balanced by moving toward the center of the drive pulley 5, the circular arc diameter is reduced and the belt 8a is held.

If the position of the belt 8 on the drive pulley 5 is an arc diameter belt 8a smaller than the maximum arc diameter, and the external force becomes smaller than the elastic force of the belt 8a at that time, the belt 8a tries to return to the original shape formed. The side face 26 of the belt 8 is in friction with the inner side face 6 of the drive pulley 5, and the belt 8a enters from the 9 o'clock to 12 o'clock direction of the pulley. A force that pushes up in the 39 direction works on the belt 8a to assist the movement of the belt 8a in the outer peripheral direction of the drive pulley 5, and is held at an arc position where the elastic force and the external force of the belt 8 are balanced. See Figure 1

This movement of the belt 8 follows the change in the force (external force) that turns the driven pulley 19, and the arc diameter of the winding around the drive pulley 5 changes continuously, so that a load-sensitive continuously variable transmission by the variable width belt becomes possible. ing.

For this reason, when the force to depress the pedal 4 is increased, the tension applied to the belt 8 is increased, and an external force is generated between the side surface 26 of the belt and the inner surface 6 of the V pulley, and the external force is greater than the elastic force of the belt 8. The cross section of the belt 8 is deformed, the belt width is narrow, the belt 8 starts to move toward the center of the drive pulley 5 and the external force generated from the tension applied to the belt 8 and the elastic force (stress when the cross section of the belt 8 is deformed). The belt 8 is held by both the drive pulley 5 and the inner surface 6 at a position where the) becomes equal, and the arc diameter is reduced to form the belt 8a. See Figure 3

Because of this principle, when a pedal 4 is depressed to start a bicycle, a force is transmitted to the drive V pulley 5 and a force is transmitted to the driven pulley 19 by the belt 8 and a large force is required to rotate the driven pulley 19. The belt 8 wound around the drive pulley 5 has a strong tension but does not expand or contract because the core wire 24 is inserted in the endless direction. For this reason, the tension applied to the side surface 26 of the belt 8 Press against both inner surfaces 6 on a disk-shaped circumference that makes an angle with V.

When the external force generated by the pressing force due to the tension is greater than the elastic force of the belt 8 or the restoring force due to the pressure of the hollow portion 9 or both, the elastic force of the belt 8 is lost and the width is deformed narrowly, and the width becomes narrower. The portion is deformed toward the upper center of the belt 8 which is more easily deformed from the lower side. In the belt 8 deformed in cross section, the reaction force (external force) generated by the belt tension between the V pulley 5 and the inner side surface 6 is balanced with the elastic force at the arc diameter position of the belt 8 and the restoring force due to the shape. The V-groove 44 of the drive pulley 5 is moved in the central direction to a position where the arc diameter can be taken, and finally, the result becomes FIGS. 3 and 8a.

The arc diameter of the moved belt 8a is smaller than the arc diameter of the driven pulley 19, the number of rotations of the driven pulley 19 is smaller than the rotation of the drive pulley 5, and the gear ratio is low.

If the load decreases while traveling at a low gear ratio due to a large load on an uphill or the like, the elastic force and restoring force of the belt 5 wins over the tension applied to the belt 8, and the original force is used. The elastic force to return to the shape acts on both inner side surfaces 6 having an angle V of the drive pulley 5. The point of intersection of the reaction forces from the inner side surfaces 6 on both sides is the center upper side of the belt 8, and the belt (8) is in the V groove 44 of the drive pulley (5) and tries to move upward in the direction of the intersection.

FIG. 4 is a side view of the drive pulley 5 and the driven pulley 19 wound around the belt 8. In this case, when the belt 8 enters the drive pulley 5, it can be expressed by a clock from 9:00 to 12:00. If the tension applied to the belt 8 is small, the rotation direction of the drive pulley 5 is clockwise as indicated by the arrow 38, so that the belt 8 at this position always has both side surfaces of the drive pulley 5 6, the belt 8 moves to the outer periphery of the pulley 5 by the two actions, and the rotational speed of the driven pulley 19 is driven by the drive pulley 5. The number of gears increases, resulting in a high gear ratio and high speed driving.

In this way, the belt 8 having elasticity only in the cross-sectional direction perpendicular to the endless direction, even when starting or running, or even when the slope gradually increases, the load of the drive pulley 5 depends on the load at that time. The gear ratio is changed by changing the arc diameter of the belt 8 in accordance with the load in the V-groove 44, and the pedaling force required for the pedal 4 is always made substantially constant.

4, the belt 8 discharged from the drive pulley 5 is discharged between 6 o'clock and 9 o'clock when expressed in terms of time, so here again, the belt 8 is the rotational friction between both the drive pulley 5 and the inner surface 6. The fixed tension pulley 13 prevents the belt 8 from sagging when the belt 8 moves toward the center of the drive pulley 5 and has a small arc diameter. Since the rotation tension pulley 14 is arranged behind the drive pulley 5, the belt 8 is regulated by the fixed tension pulley 13, so that it can be smoothly fed to the driven pulley 19 without being wound around the drive pulley 5. .

Even in the case of a high gear where the belt 8 is in the vicinity of the outer periphery of the drive pulley 5 at the start, the belt 8 moves in the groove 44 of the pulley 5 before the force is transmitted to the driven pulley 19. Therefore, the pedal 4 can be lightly stepped and rotated, and can continue to be stepped on with its inertia, so that a large force is not required at the time of starting. A belt 8 that does not expand and contract in the endless direction but expands and contracts in the lateral (width) direction, and has an elastic force and a restoring force, enables a continuously variable transmission in response to a load. As a result, in any situation, it is possible to concentrate only on driving without being bothered by gear shift switching.
Since the structure is very simple, it can be manufactured at a low cost, and it has a feature that it is not in the past, and it has the feature of automatically changing continuously in response to the load, so it can compete with cheap overseas products.

Although it is not necessary to equip with standard equipment, it is possible to install the following.
An upper pulley 17 with a collar 40 that can be rotated to the upper side of the belt 8 in the belt approaching direction of the drive pulley 5 and a lower pulley 18 with a collar 40 that can be rotated to the lower side are arranged and simultaneously moved up and down. In this way, the shift can be fixed by forcing the approach position of the belt 8. 4 and 15. Further, if the fixed shaft 33 for fixing the upper pulley 17 and the thrust shaft 29 holding the upper pulley 18 is pulled out by pulling the wire B 35 held on the fixed shaft 33, the thrust is obtained. Since the shaft 29 becomes free in the thrust bearing 32, the upper pulley 17 and the upper pulley 18 follow the vertical movement of the belt 8 and do not restrict the belt entry position.

Embodiments of the present invention will be described below.
FIG. 4 is a side view of the present invention. In this figure, the belt 8 is first wound around the drive pulley 5 and the driven pulley 19, and the belt is not in tension with the pedal 4. Drive pulley 8 having a deep bottom is held in an arc on inner side surfaces 6 on both sides of drive pulley 5 at a position near the outer periphery of V groove 44 in FIGS.

The belt 8 deforms in the lateral direction of the belt when an external force of a certain level or more is applied to the side surface 26, but has elasticity to return to its original shape when unloaded, or has elasticity similar to rubber. A resin, TPE (Thermo Plastic Elastomer), is formed from a thermoplastic elastomer resin. However, since the core wire 24 is embedded in the entire length in the endless direction, it does not expand and contract. The core wire is formed into a core wire 24 using a woven fabric such as aramid fiber, high-tensile tetron, polyester, Kepler, rope or non-woven fabric which has tensile strength and excellent flexibility.
The core wire 24 is buried in the lower direction from the upper and lower centers of the belt in the vicinity of the inner bottom 43 of the belt so as not to inhibit the change in width when tension is applied. A non-slip groove 27 is provided on the outer surface.
A rubber hardness of 50 degrees or less, which indicates the elasticity of rubber or the like, allows smooth movement in the movement of the belt 8, but when formed in a plurality of layers having different elastic forces, the hardness of the jacket layer 8b is 50 degrees. The above is desirable. In the following description of the embodiment of the invention, the belt 8 will be described as having the features of the previous stage.

Usually, the V-belt is a trapezoid consisting of four sides.
In FIGS. 5 and 6, a triangle having R (radius) at three corners is formed, and a hollow portion 9 is provided in the entire endless direction. A belt 8 provided with a spiral, ring-shaped, or U-shaped core wire 21.

5 and 6 are triangular with R (radius) at three corners, and have a hollow portion 9 in the entire endless direction, and intersect the core wire 24 at intervals to maintain the shape. A spiral, ring-shaped, or U-shaped core wire 21 is provided, and a non-slip groove 27 is formed on the jacket surface. The internal pressure of the hollow portion 9 is made higher than atmospheric pressure by air, gas, etc. The belt 8 which strengthened.

FIG. 7 shows a trapezoidal V shape, and a groove 45 is provided in the entire endless direction in the center on the back side 42 of the belt to facilitate cross-sectional deformation in the lateral direction of the belt. Is a belt 8 having improved flexibility at regular intervals.

FIG. 8 shows a belt 8 having a round shape and a hollow portion 9.

FIG. 9 shows a belt 8 formed of the same elastic body into a single circle and having a cut 41 on the back side 42.

FIG. 10 shows a belt 8 having a plurality of layers of different elastic bodies (8c) and (8b) and having a circular cross-sectional shape.

FIG. 11 shows a belt 8 having a plurality of layers of different elastic bodies (8c) and (8b) and a trapezoidal cross section.

FIG. 12 shows a belt 8 formed in a semicircular shape.

FIG. 13 shows a belt 8 having a V cross-sectional shape and corners with R (radius).

Partial cross-sectional oblique view of drive pulley and belt Partial cross-sectional oblique view of driven pulley 6 is a partial cross-sectional view of the pedal portion in which the belt 8 of FIG. 6 is arranged on the drive pulley. Side view of the configuration of the present invention Side and partial sectional oblique view of the belt of the present invention showing an endless state Partial cross-sectional oblique view of a belt with a triangular cross-section and a hollow section Partial cross-sectional oblique view of a belt with a trapezoidal cross-section and a groove and cut at the top Partial cross-sectional oblique view of a belt formed with a round cross-section and a hollow portion Partial cross-sectional oblique view of the belt 8 in which the cut line 41 is arranged on the back side 42 of the belt whose cross-sectional shape is formed as a single circle. Partial cross-sectional oblique view of a belt formed of multiple layers of elastic bodies with different cross-sectional shapes Partial cross-sectional oblique view of a belt formed of multiple layers of elastic bodies with different cross-sectional shapes Partial sectional oblique view of a belt with a semicircular cross-sectional shape Partial sectional oblique view of a belt having a V-shaped cross section Partial cross-sectional oblique view of upper pulley 17 and lower pulley 18 Sectional view of belt 9 wound around drive pulley Sectional view of belt 10 wound around drive pulley Sectional view with belt Fig. 8 wrapped around drive pulley Partial sectional view of V belt (JIS K6323) Partial sectional front view of the operation unit 15 Partial sectional side view of the operation unit 15 Sectional view of drive pulley of CVT continuously variable transmission Cross section of driven pulley of CVT continuously variable transmission

DESCRIPTION OF SYMBOLS 1 Car body 2 Crankshaft 3 Crank 4 Pedal 5 Driving pulley 6 Inner side surface 7 Unevenness by sandblasting, etc. 8 Belt 8a Elastic material having elastic force different from that of the belt 8b 8c moved in the bottom direction of the driving pulley 9 hollow portion 10 tension shaft 11 support 12 kick spring 13 fixed tension pulley 14 rotary tension pulley 15 operation portion 16 operation plate 17 upper pulley 18 lower pulley 19 driven pulley 20 driven pulley groove 21 lateral core wire 22 outside Cloth 23 Adhesive rubber 24 Core wire 25 Bottom rubber 26 Side surface 27 Groove in jacket 28 Wire A
29 Thrust shaft 30 Support plate 31 Holding metal 32 Thrust shaft, receiver 33 Fixed shaft 34 Pressing spring 35 Wire B 36 Wire cable 37 Recessed portion of thrust shaft 38 Arrow 39 indicating the rotational direction 39 Force direction applied to the belt by rotational friction 40 Collar 41 Cut 42 Belt back side 43 Belt inner bottom 44 Drive pulley V groove 45 Belt back groove 46 Endless direction arrow 47 V pulley bottom 100 Drive pulley fixed side plate 100a Drive pulley , Movable side plate 101, fixed side plate 101a of driven pulley, movable side plate 102 of driven pulley, shaft 103, arrow A
104 Arrow B

Claims (5)

Load-sensitive continuously variable transmission using a variable width belt, characterized in that a belt 8 that does not expand and contract in the endless direction, but is stretched and elastic in the direction transverse to the endless direction, is wound around at least a pair of pulleys. apparatus. 2. A load-sensitive continuously variable transmission using a variable width belt according to claim 1, further comprising a hollow portion. 2. The load-sensitive continuously variable transmission using a variable width belt according to claim 1, wherein the pressure of the hollow portion is increased by air or gas. 2. The load response by the variable width belt according to claim 1, wherein the core wire is embedded in the vicinity of the inner bottom 43 of the belt in a direction lower than the upper and lower centers of the belt, and a groove 27 is provided on the outer jacket surface. Continuously variable transmission. The load-sensitive continuously variable transmission using a variable width belt according to claim 1, wherein the load-sensitive continuously variable transmission is formed of a plurality of different elastic bodies.

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