JP2014185768A - Continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a distance between shafts.SOLUTION: A continuously variable transmission 1 is constituted by winding a belt V (endless member) around a pulley mechanism 4 provided on an input shaft 2 and a pulley mechanism 5 provided on an output shaft 3. The pulley mechanisms 4, 5 each have a ring-like winding part 6 around the outer periphery of which the belt V is wound, and a driving mechanism part 7 for changing an outside diameter of the winding part 6. Scissors members 20 that can couple a pair of overlaid link members 10A, 10B with each other at an intermediate part in a longitudinal direction and relatively rotate around a common rotation shaft Xc are aligned in a circumferential direction around the input shafts 2, 3 in a ring-like manner while the rotation shaft Xc is along a radial direction of the input shafts 2, 3. The scissors members 20 adjacent to each other in the circumferential direction are constituted so that ends of the link members 10A, 10B are coupled with each other relatively rotatably to form the winding part 6.

Description

  The present invention relates to a continuously variable transmission.

  A belt-type continuously variable transmission has a basic configuration in which a belt is wound between a primary pulley and a secondary pulley (for example, Patent Document 1).

JP 2010-270773 A

FIG. 5A is a diagram illustrating the basic configuration of a belt-type continuously variable transmission, and FIG. 5B illustrates the winding radius of the belt V wound around the primary pulley Ppri and the secondary pulley Psec. It is a figure and is the figure which represented the AA cross section in (a) typically.
In FIG. 5B, the belt arrangement when the gear ratio of the continuously variable transmission is the highest is indicated by a solid line, and the belt arrangement when the gear ratio is the lowest is indicated by a wavy line. .

  Each of the primary pulley Ppri and the secondary pulley Psec includes a fixed sheave 100 and a movable sheave 110 assembled to the fixed sheave 100 from the direction of the rotation axis. In the fixed sheave 100 and the movable sheave 110, the rotation sheave in the rotation axis direction. A pulley groove 115 in which the belt V is clamped is formed between the flange-shaped sheave portions 101 and 111 arranged to face each other.

  In the belt-type continuously variable transmission configured as described above, the contact between the belt V and the primary pulley Ppri and the secondary pulley Psec is achieved by changing the groove width of the pulley groove 115 by moving the movable sheave 110 in the rotation axis direction. The radius (winding radii D1, D2: see FIG. 5B) is changed, and the gear ratio is continuously variable by changing the groove width of the pulley groove 115 according to the driving state of the vehicle. It is going to change.

Here, since the outer diameter Dx of the primary pulley Ppri and the secondary pulley Psec (the outer diameter of the sheave portions 101 and 111) is determined based on the time when the winding radius of the belt V is maximized, the primary pulley Ppri and the secondary pulley Ppri are determined. The distance L between the shafts of the pulley Psec (the distance between the input shaft and the output shaft of the continuously variable transmission) is inevitably determined based on the outer diameter Dx of the primary pulley Ppri and the secondary pulley Psec.
For this reason, due to the recent demand for miniaturization, even if the distance L between the axes is to be reduced, the distance between the axes cannot be reduced.

  Therefore, it is required to reduce the distance between the shafts in the belt type continuously variable transmission.

The present invention
A continuously variable transmission configured by winding an endless member around a pulley mechanism provided on an input-side rotating shaft and a pulley mechanism provided on an output-side rotating shaft,
The pulley mechanism is
A ring-shaped winding part around which the endless member is wound around the outer circumference;
A drive mechanism that changes the outer diameter of the winding part,
The winding portion,
A pair of link members connected to each other at the middle in the longitudinal direction, and scissors members that are relatively rotatable around a common rotation axis are arranged in a ring shape in the circumferential direction around the rotation axis. A continuously variable transmission characterized in that adjacent scissors members are formed by connecting ends of link members so as to be relatively rotatable.

If comprised in this way, if the intersection angle around the rotating shaft of two link members will change, the length of the circumferential direction of a winding part will change, and the outer diameter of a winding part will change. Therefore, by changing the crossing angle of the two link members around the rotation axis to change the outer diameter of the winding portion, the winding radius of the endless member wound around the outer periphery of the winding portion is changed to the continuously variable transmission. The predetermined radius according to the gear ratio can be set.
As a result, in a continuously variable transmission that employs a pulley mechanism having a winding part, it is possible to change the radial sizes of the input-side pulley mechanism (winding part) and the output-side pulley mechanism (winding part). Therefore, the distance between the shafts can be made narrower than in the case of the conventional continuously variable transmission in which the outer diameter of the pulley is set with reference to the time when the winding radius of the endless member is maximized.

It is a figure explaining the continuously variable transmission provided with the pulley mechanism concerning embodiment. It is a figure explaining the winding part of a pulley mechanism. It is a figure explaining operation | movement of a pulley mechanism. It is a figure explaining the distance between axes in a continuously variable transmission. It is a figure explaining the structure of the continuously variable transmission concerning a prior art example.

Hereinafter, an embodiment of a belt type continuously variable transmission 1 according to the present invention will be described.
FIG. 1 is a diagram for explaining a continuously variable transmission 1 including pulley mechanisms 4 and 5 according to the embodiment. FIG. 1A is a schematic configuration diagram of the continuously variable transmission 1, and FIG. 4 is a perspective view illustrating a state where a belt V is wound around the outer periphery of a winding unit 6. FIG. In FIG. 1B, only a part of the winding part 6 and the belt V is shown.
FIG. 2 is a view for explaining the wrapping portion 6 of the pulley mechanisms 4 and 5 and the scissors member 20 constituting the wrapping portion 6. FIG. 2A illustrates the link member 10 constituting the scissors member 20. (B) is a figure explaining the scissors member 20 comprised by connecting the link member 10 (10A, 10B), (c) is the scissors member 20 arranged in the circumferential direction around the axis line Xa. It is a figure explaining the state which connected mutually and comprised the winding part 6. FIG.
In FIGS. 2B and 2C, one link member 10 </ b> A is shown with hatching so that the overlapped link members 10 </ b> A and 10 </ b> B can be distinguished from each other.

The continuously variable transmission 1 has a basic configuration in which a belt V is wound around an input-side pulley mechanism 4 provided on an input shaft 2 and an output-side pulley mechanism 5 provided on an output shaft 3. Yes.
Here, since the input side pulley mechanism 4 and the output side pulley mechanism 5 have the same configuration, the configuration of the input side pulley mechanism 4 will be described below, and the output side pulley mechanism 5 will be described. The description of the configuration is omitted.

The pulley mechanism 4 includes a ring-shaped winding portion 6 that surrounds the outer periphery of the input shaft 2, and a drive mechanism portion 7 that changes the outer diameter of the winding portion 6. The belt V is wound around.
The winding portion 6 includes a scissors member 20 configured by connecting two link members 10 (10A, 10B) so as to be relatively rotatable around a common rotation axis Xc (connection member 15). The scissors members 20 that are arranged in a ring shape in the circumferential direction around the axis line Xa) and that are adjacent in the circumferential direction are connected to each other.

  As shown to (a) of FIG. 2, the base 11 of the link member 10 has a rectangular shape in planar view. The base 11 is a plate-like member formed with the same thickness over the entire length Lb in the longitudinal direction, and is formed with the same width W over the entire length in the longitudinal direction.

A through hole 12 is provided in the central portion of the base portion 11 in the longitudinal direction so as to penetrate the base portion 11 in the thickness direction, and the base portion 11 is also thickened at one end 111 and the other end portion 112 in the longitudinal direction of the base 11. A through hole 13 and a through hole 14 are provided penetrating in the direction.
In the base portion 11, the through hole 12 is located between the through holes 13 and 14, and the separation distance Lx between the through hole 12 and the through hole 13 and the separation distance Lx between the through hole 12 and the through hole 14 are the same length. Is set.

In the embodiment, the two link members 10 (10A, 10B) overlapped with each other are connected to each other at an intermediate portion in the longitudinal direction to form the scissors member 20, and the link member 10 (10A, 10B) in the scissors member 20 is configured. Are connected to each other by a connecting member 15 inserted into the central through-hole 12 (see FIG. 2B).
In this state, the link members 10 </ b> A and 10 </ b> B are relatively rotatable around a common rotation axis Xc passing through the center of the through hole 12, and the scissors member 20 is a paper surface as viewed from the axial direction of the rotation axis Xc. The link member 10 </ b> A located on the front side and the link member 10 </ b> B located on the back side of the drawing are crossed and assembled into the winding portion 6.

As shown in FIG. 2 (c), the scissors member 20 in the wrapping portion 6 is arranged in a direction in which one link member 10A is arranged radially outside and the other link member 10B is arranged radially inside, respectively. They are arranged in the circumferential direction around the input shaft 2 (axis line Xa).
In this state, each scissors member 20 is arranged in a direction in which the rotation axes Xc of the link members 10A and 10B are aligned (matched) along a straight line extending in the radial direction from the input shaft 2 (axis line Xa) ( The rotation axis Xc of each scissors member 20 is located radially around the axis line Xa when viewed from the axial direction of the input shaft 2.

  As shown in FIG. 2 (c), each of the scissors members 20 in the wrapping portion 6 includes a link member of another scissors member 20 adjacent to the one end 111A and the other end 112A of the link member 10A in the circumferential direction. The one end 111B and the other end 112B of the link member 10A and the one end 111B and the other end 112B of the link member 10B are overlapped with each other. The coupling members 16 and 17 inserted into the through holes 13 and 14 are coupled so as to be relatively rotatable around a rotation axis Xd substantially parallel to the rotation axis Xc.

Here, when the winding portion 6 is viewed from the outside in the radial direction of the axis Xa, each of the connection points (connection members 15) of the scissors members 20 adjacent in the circumferential direction is located on a straight line Ln orthogonal to the axis Xa. Yes. The connecting point (connecting member 16) between the one end portions 111A and 111B of the link members 10A and 10B and the connecting point (connecting member 17) between the other end portions 112A and 112B are also straight lines Ln1 orthogonal to the axis Xa. , Ln2.
As described above, since the distance Lx between the through hole 12 and the through holes 13 and 14 in the link member 10 is the same, the distance La between the straight line Ln and the straight line Ln1, the straight line Ln and the straight line Ln2 The separation distance La is also the same.

  Here, as shown in FIG. 2B, when the crossing angle θ of the link members 10A and 10B is increased in the scissors member 20, the distance between the one end 111A of the link member 10A and the one end 111B of the link member 10B is increased. Lc and the separation distance Lc between the other end portion 112A of the link member 10A and the other end portion 112B of the link member 10B increase by the same width.

Therefore, for example, when the crossing angle θ of the link members 10 </ b> A and 10 </ b> B is increased in each of the scissors members 20 constituting the winding portion 6, the circumferential length of the winding portion 6 is increased, and the outside of the winding portion 6 is increased. The diameter (diameter) increases. Further, when the crossing angle θ of the link members 10A and 10B is reduced, the circumferential length of the winding part 6 is shortened, and the outer diameter (diameter) of the winding part 6 is reduced.
Thus, the winding part 6 concerning embodiment can change the outer diameter by changing the crossing angle of link member 10A, 10B.

As shown in FIG. 1A, one end of a connecting rod 24 is swingably connected to one connecting member 17 in the width direction of the winding portion 6, and the other end of the connecting rod 24 is The ring-shaped fixing member 22 that is externally fitted and fixed to the input shaft 2 is swingably connected.
A plurality of connecting rods 24 are provided at intervals in the circumferential direction around the input shaft 2, and are arranged radially when viewed from the axial direction of the input shaft 2 (the axial direction of the axis line Xa).

  Each of the connecting rods 24 has the same length, and holds the winding portion 6 at a predetermined position on the radially outer side of the input shaft 2. The winding portion 6 is connected to the input shaft 2 via a connecting rod 24 and a fixing member 22, and rotates together with the input shaft 2 when the input shaft 2 rotates.

  Here, one end and the other end of the connecting rod 24 are connected to the connecting member 17 and the fixing member so that the connecting portion with the connecting member 17 can move in the radial direction and the axial direction of the input shaft 2. 22 is swingably connected. Therefore, when the outer diameter of the winding portion 6 increases, the crossing angle θ1 of the connecting rod 24 with respect to the input shaft 2 (axis line Xa) increases, and when the outer diameter of the winding portion 6 decreases, the input shaft 2 of the connecting rod 24 increases. The crossing angle θ1 with respect to (axis line Xa) is reduced.

One end of a connecting rod 23 is swingably connected to the other connecting member 16 in the width direction of the winding portion 6, and the other end of the connecting rod 23 is swingably connected to the movable member 21. ing.
A plurality of connecting rods 23 are provided at intervals in the circumferential direction around the input shaft 2 and are arranged radially when viewed from the axial direction of the input shaft 2 (the axial direction of the axis Xa).
Each of the connecting rods 23 has the same length as the connecting rod 24 described above, and holds the winding portion 6 at a predetermined position on the radially outer side of the input shaft 2. The winding portion 6 is connected to the input shaft 2 via the connecting rod 23 and the movable member 21, and rotates together with the input shaft 2 when the input shaft 2 rotates.

Here, one end and the other end of the connecting rod 23 are connected to the connecting member 16 and the movable member so that the connecting portion with the connecting member 16 can move in the radial direction and the axial direction of the input shaft 2. 21 is swingably connected.
The movable member 21 to which the connecting rod 23 is connected is provided so as to be movable only in the axial direction of the input shaft 2 by a keyway (not shown) provided on the outer periphery of the input shaft 2.
Therefore, when the movable member 21 moves in the axial direction of the input shaft 2, the connecting portion of the connecting rod 23 with the movable member 21 moves in the axial direction, and the connecting portion of the connecting rod 23 with the connecting member 16 moves to the input shaft. The outer diameter of the winding part 6 is changed by moving in the axial direction and the radial direction.

  A concave groove 21a (see FIG. 1) is provided on the outer periphery of the movable member 21, and a connecting member 27 extending from the rod 26 of the actuator 25 is provided in the concave groove 21a from the outside in the radial direction. Is engaged. Here, the actuator 25 moves the rod 26 and the connecting member 27 forward and backward in the axial direction of the input shaft 2, and the connecting member 27 is engaged with the concave groove 21a so as to be relatively rotatable. Therefore, when the rod 26 and the connecting member 27 are moved in the axial direction of the input shaft 2 by the actuator 25, the movable member 21 is moved in the axial direction by the connecting member 27.

The operation of the pulley mechanism 4 will be described.
FIG. 3 is a diagram for explaining the operation of the pulley mechanism 4. FIG. 3A schematically shows a state in which the winding portion 6 is disposed on the outer diameter (maximum outer diameter Dx1) at which the winding radius of the belt V is maximum. (B) is a figure which shows typically the state by which the winding part 6 is arrange | positioned to the outer diameter (minimum outer diameter Dx2) in which the winding radius of the belt V becomes the minimum. FIG. 3C is a view of the winding portion 6 having the maximum outer diameter as viewed from the outside in the radial direction, and illustrates the shape of the scissors member 20 arranged side by side in the circumferential direction in the winding portion 6. (D) is the figure which looked at the winding part 6 made into the minimum outer diameter from the radial direction outer side, Comprising: The shape of the scissors member 20 arrange | positioned along with the circumferential direction in the winding part 6 FIG.

  As shown in FIGS. 3A and 3C, in the winding portion 6 having the maximum outer diameter, the crossing angle θ between the link member 10A of the scissors member 20 and the link member 10B is large, and the outer peripheral surface The scissors member 20 that becomes the winding surface of the belt V is disposed at a position farthest radially outward from the input shaft 2.

From this state, when the actuator 25 (see FIG. 1) is driven to move the movable member 21 in a direction away from the fixed member 22 (rightward in FIG. 3A), the movable member of the connecting rod 23 is moved. The connecting portion with the 21 side moves together with the movable member 21 in the direction of arrow a in the figure.
Then, the connecting portion of the connecting rod 23 to the connecting member 16 moves in the axial direction and the radial direction of the input shaft 2, and the connecting rod 23 decreases the crossing angle θ1 with respect to the axis Xa (see arrow b in the figure). Therefore, a force (see arrow c in the figure) in the direction of narrowing the outer diameter of the winding part 6 acts on the winding part 6 to which the connecting rod 23 is connected.

  Here, since the connecting rods 23 are provided radially in the circumferential direction around the input shaft 2, when the connecting rod 23 is tilted in the direction of the arrow b in the figure by the movement of the movable member 21, one end of each connecting rod 23 is provided. Are connected to the input shaft 2 side (in the direction of narrowing the outer diameter of the winding portion 6).

  When a force for narrowing the outer diameter of the winding portion 6 is applied to the winding portion 6, in each of the scissors members 20 that have received this force, the link members 10A and 10B are crossed by the link members 10A and 10B. By rotating in the direction in which the angle θ is narrowed (see arrow d in the figure), the circumferential length of the winding part 6 is shortened, so that the outer diameter of the winding part 6 is narrowed.

At this time, the connecting rod 24 swingably connected to the connecting member 17 on the opposite side is interlocked with the rotation of the link members 10A and 10B in the direction of narrowing the crossing angle θ (see arrow d in the figure). By pulling and tilting in the direction indicated by the middle arrow b, the outer diameter of the winding portion 6 on the side of the connecting member 17 is also narrowed simultaneously with the connecting member 17.
Here, since the connecting rod 24 is also provided radially in the circumferential direction around the input shaft 2, the outer diameter of the winding portion 6 on the side of the connecting member 17 is uniformly narrowed.
Therefore, the winding part 6 changes equally from the state of the maximum outer diameter shown to (a), (c) of FIG. 3 to the state of the minimum outer diameter shown to (b), (d) of FIG. It will be.

  Thus, by moving the movable member 21 in the axial direction of the input shaft 2 by the actuator 25, the outer diameter of the winding portion 6 is set to the maximum outer diameter (see FIG. 3A) and the minimum outer diameter (see FIG. 3). 3 (see (b)), the position of the movable member 21 in the axial direction of the input shaft 2 is adjusted to adjust the belt V wound around the outer periphery of the winding portion 6. The wrapping radius can be any radius.

  FIG. 4 is a diagram for explaining the inter-shaft distance of the continuously variable transmission including the pulley mechanism according to the embodiment and the inter-shaft distance of the continuously variable transmission including the conventional pulley mechanism. It is a figure explaining the center distance in the case of the continuously variable transmission 1 which employ | adopted the pulley mechanisms 4 and 5 which have the winding part 6 concerning this form, (b) is a continuously variable transmission provided with the conventional pulley mechanism. It is a figure explaining the distance between axes in the case of a machine.

As shown in FIG. 4 (b), in a continuously variable transmission having a conventional pulley mechanism, the outer diameter Dx of the pulley portion on the input side and the pulley portion on the output side (fixed sheave 100, movable sheave 110) is It is set on the basis of the maximum winding radius (maximum winding radius).
Therefore, the inter-axis distance L between the primary pulley Ppri and the secondary pulley Psec is determined by the outer diameter Dx of the pulley portion (the fixed sheave 100 and the movable sheave 110).

As shown in FIG. 4A, in the continuously variable transmission 1 employing the pulley mechanisms 4 and 5 having the winding part 6 according to the embodiment, the outer diameter of the winding part 6 is the winding radius of the belt V. It changes according to.
Here, in the continuously variable transmission 1, since the winding parts 6 of the pulley mechanisms 4 and 5 do not both have the maximum outer diameter Dx1, one winding part 6 has the maximum outer diameter Dx1, and the other winding part 6 When the portion 6 reaches the minimum outer diameter Dx2, the pulley mechanism 4 and the pulley mechanism 5 are brought close to each other up to an inter-axis distance L1 at which the winding portion 6 of the pulley mechanism 4 and the winding portion 6 of the pulley mechanism 5 do not interfere with each other. Can be provided.
As a result, the inter-axis distance can be made narrower than in the case of a continuously variable transmission having a conventional pulley mechanism.

As described above, in the embodiment,
A belt V (endless member) is wound around a pulley mechanism 4 provided on the input shaft 2 (input-side rotation shaft) and a pulley mechanism 5 provided on the output shaft 3 (output-side rotation shaft). Continuously variable transmission 1,
The pulley mechanisms 4 and 5
A ring-shaped winding portion 6 around which the belt V is wound around the outer periphery;
A drive mechanism unit 7 that changes the outer diameter of the winding unit 6,
The scissors member 20 that is connected to the pair of link members 10A and 10B that are overlapped with each other at the intermediate portion in the longitudinal direction so as to be relatively rotatable around the common rotation axis Xc is used as the rotation axis Xc. The scissors adjacent to each other in the circumferential direction are arranged in a ring along the circumferential direction around the rotary shaft (input shaft 2, output shaft 3) in the direction along the radial direction of the rotary shaft (input shaft 2, output shaft 3) The member 20 can be relatively rotated around the common rotation axis Xd between the ends of the link members 10A and 10B (one end 111A and one end 111B, and the other end 112A and the other end 112B). It was set as the structure formed by connecting.

With this configuration, when the crossing angle θ around the rotation axis Xc of the pair of link members 10A and 10B changes, the circumferential length of the winding part 6 changes, and the outer diameter Dx of the winding part 6 changes. (Dx1, Dx2) changes.
Therefore, the driving mechanism 7 changes the crossing angle θ around the rotation axis Xc of the pair of link members 10 </ b> A and 10 </ b> B to change the outer diameter of the winding portion 6, thereby winding the outer periphery of the winding portion 6. The wound radius of the belt V can be set to a predetermined radius corresponding to the transmission ratio of the continuously variable transmission.
Thereby, in the continuously variable transmission including the pulley mechanisms 4 and 5 in which the outer diameter of the winding part 6 is changed, the pulley mechanism 4 on the input side (the winding part 6) and the pulley mechanism 5 on the output side (the winding part 6). ) In the radial direction can be changed, so that the outer diameter of the pulley is set on the basis of when the winding radius of the endless member is maximized. The distance can be reduced.

The drive mechanism unit 7
One end in the longitudinal direction is swingably connected to a fixed member 22 that rotates integrally with the rotation shaft (input shaft 2, output shaft 3), and the other end in the longitudinal direction is connected to the rotation shaft (input shaft 2, output shaft). A connecting rod 23 (first connecting member) that is swingably connected to one side of the winding portion 6 in the axial direction of the shaft 3);
One end in the longitudinal direction is swingably connected to a movable member 21 that rotates integrally with the rotation shaft (input shaft 2 and output shaft 3), and the other end in the longitudinal direction is connected to the rotation shaft (input shaft 2, output shaft). And a connecting rod 24 (second connecting member) that is swingably connected to the other side of the winding portion 6 in the axial direction of the shaft 3), and the movable member 21 is connected to the rotating shaft (input shaft). 2. It is configured to be movable in the axial direction of the output shaft 3) and to move forward and backward in the axial direction by the actuator 25.

With this configuration, when the movable member 21 is moved in the axial direction by the actuator 25, the connecting portion of the connecting rod 23 to the movable member 21 is moved in the axial direction, so that the rotating shaft (input shaft 2) of the connecting rod 23 is moved. The inclination with respect to the output shaft 3) changes. Then, according to the moving direction of the movable member 21, the position of the connecting portion (connecting member 16) with the winding portion 6 of the connecting rod 23 is added to the axial direction of the rotating shaft (input shaft 2, output shaft 3). It also changes in the radial direction.
As a result, a force for changing (expanding / reducing) the outer diameter of the winding portion 6 acts on the winding portion 6, and the force applied in each of the scissors members 20 constituting the winding portion 6. Accordingly, the crossing angle θ of the link members 10A and 10B changes. Thereby, the length of the circumferential direction of the winding part 6 changes, and the outer diameter of the winding part 6 changes.
Therefore, the outer diameter of the winding portion 6 can be easily changed (expanded / reduced) simply by moving the movable member 21 in the axial direction by the actuator 25.
In particular, since only the movable member 21 on one side of the winding portion 6 in the axial direction of the rotation shaft (the input shaft 2 and the output shaft 3) is provided to be movable in the axial direction, both the movable member 21 and the fixed member 22 are provided. Can be moved in the axial direction, and the configuration can be simplified as compared with the case where these are moved in the axial direction by an actuator.

  Here, the other end of the connecting rod 23 is swingably connected to a connecting portion (connecting member 16) between the one end portions 111A and 111B of the link members 10A and 10B, and the other end of the connecting rod 24 is connected to the link member 10A. 10B, the other end portions 112A and 112B are connected to each other in a swingable manner (the connecting member 17). In the axial direction of the input shaft 2, the connecting portion (the connecting member 16) and the connecting portion (the connecting member 17) are It was set as the structure provided in the position which becomes symmetrical on both sides of the connection part (connection member 15) of link member 10A, 10B in the scissors member 20. As shown in FIG.

If comprised in this way, link member 10A, 10B in the scissors member 20 can be rapidly rotated around a mutual connection part (connection member 15), and the outer diameter of the winding part 6 can be changed.
In particular, the wrapping portion 6 includes a pair of link members 10 (10A, 10B) connected to each other so as to be relatively rotatable, and the end portions of the link members 10 (10A, 10B) are relative to each other. Since it is configured to be connected in a rotatable manner, the friction generated when the outer diameter of the winding portion 6 is changed can be reduced, and the required driving force can be reduced. Therefore, the outer diameter of the winding part 6 can be quickly changed by one actuator 25.

  A plurality of connecting rods 23 and 24 are provided in a radial manner at intervals in the circumferential direction around the input shaft 2.

If comprised in this way, when the force which changes the outer diameter of the said winding part 6 will act with respect to the winding part 6, this force will be applied to a rotating shaft (input shaft 2, output shaft 3). Acts equally in the surrounding circumferential direction. Thereby, since the outer diameter of the winding part 6 can be expanded / contracted equally, the winding radius of the belt V wound around the winding part 6 can be changed stably.
Furthermore, since the connecting rods 23 and 24 are provided radially in the circumferential direction around the input shaft 2, the shape stability of the winding portion 6 is improved, so that the winding portion 6 can be reliably held at a predetermined outer diameter. it can.
Therefore, the reliability of the pulley mechanism that employs the winding portion is improved.

In the above-described embodiment, the case where only the movable member 21 located on one side across the winding portion 6 is provided so as to be movable back and forth in the axial direction of the rotary shaft (input shaft 2 and output shaft 3) is illustrated. The fixing member 22 positioned on the other side may be provided so as to be movable back and forth in the axial direction of the rotation shaft (input shaft 2 and output shaft 3), and may be moved forward and backward in the axial direction by an actuator.
Even in such a case, since the outer diameter of the winding portion 6 can be changed, the same effect as the case of the above-described embodiment is exhibited.

DESCRIPTION OF SYMBOLS 1 Continuously variable transmission 2 Input shaft 3 Output shaft 4, 5 Pulley mechanism 6 Winding part 7 Drive mechanism part 10 (10A, 10B) Link member 11 Base part 12 Through-hole 13 Through-hole 14 Through-hole 15 Connecting member 16 Connecting member 17 Connecting member 20 Scissors member 21 Movable member 21a Concave groove 22 Fixed member 23 Connecting rod 24 Connecting rod 25 Actuator 26 Rod 27 Connecting member 111 (111A, 111B) One end 112 (112A, 112B) The other end Dx Outer diameter Dx1 Maximum outer Diameter Dx2 Minimum outer diameter V Belt Xa Axis Xc Rotating axis Xd Rotating axis

Claims (3)

A continuously variable transmission configured by winding an endless member around a pulley mechanism provided on an input-side rotating shaft and a pulley mechanism provided on an output-side rotating shaft,
The pulley mechanism is
A ring-shaped winding part around which the endless member is wound around the outer circumference;
A drive mechanism that changes the outer diameter of the winding part,
The winding portion,
A pair of link members connected to each other at the middle in the longitudinal direction, and scissors members that are relatively rotatable around a common rotation axis are arranged in a ring shape in the circumferential direction around the rotation axis. A continuously variable transmission characterized in that adjacent scissors members are formed by connecting ends of link members so as to be relatively rotatable. The drive mechanism is
A first longitudinal end is connected to the rotary shaft in a swingable manner, and a second end in the longitudinal direction is connected to one side of the winding portion in the axial direction of the rotary shaft in a swingable manner. A connecting member of
A second end of the longitudinal direction is pivotably connected to the rotating shaft, and the other end of the longitudinal direction is swingably connected to the other side of the winding portion in the axial direction of the rotating shaft. A connecting member, and
At least one of a connecting portion of the first connecting member with the rotating shaft and a connecting portion of the second connecting member with the rotating shaft is movable in the axial direction of the rotating shaft. The continuously variable transmission according to claim 1,   3. The continuously variable transmission according to claim 2, wherein a plurality of the first connecting members and the second connecting members are provided radially with a space in the circumferential direction around the rotation shaft. .

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