JP6029568B2 - Continuously variable transmission - Google Patents

Description

  The present invention relates to a continuously variable transmission of a four-bar linkage mechanism type that can change speed by adjusting a rotation radius with a rotation radius adjustment mechanism provided on a rotation center axis of an input shaft.

  Conventionally, a hollow input shaft that rotates in a case by transmitting a driving force from a main drive source such as an engine provided in a vehicle, an output shaft that is arranged in parallel with the input shaft, and rotation of the input shaft A plurality of turning radius adjusting mechanisms provided on the central axis, a plurality of swing links pivotally supported on the output shaft, and an input side annular portion rotatably fitted on the turning radius adjusting mechanism at one end There is known a four-bar link mechanism type continuously variable transmission including a connecting rod having the other end connected to the swing end of the swing link (see, for example, Patent Document 1).

  The input shaft, the output shaft, the turning radius adjusting mechanism, the swing link, and the connecting rod of Patent Document 1 constitute a lever crank mechanism. Between the swing link and the output shaft, the swing link is fixed to the output shaft when trying to rotate relative to the output shaft on one side, and the output shaft is fixed when trying to rotate relative to the other side. On the other hand, a one-way clutch is provided as a one-way rotation prevention mechanism that idles the swing link.

  The turning radius adjusting mechanism includes a disk-like rotating portion having a through hole formed eccentrically from the center, a ring gear provided on the inner peripheral surface of the through hole, and a first pinion fixed to the input shaft and meshing with the ring gear. And a carrier to which the driving force from the adjusting drive source is transmitted, and two second pinions that are pivotally supported by the carrier so as to rotate and revolve, and mesh with the ring gear. The first pinion and the two second pinions are arranged so that a triangle whose apex is the central axis thereof is an equilateral triangle.

  When the rotational speed of the input shaft that is rotated by the main drive source and the carrier that is rotated by the adjustment drive source is the same, the eccentricity of the center point of the rotating portion with respect to the input center axis of the input shaft is maintained, and the rotation radius The radius of the rotation locus of the adjusting mechanism is also kept constant. When the rotational speed of the input shaft rotated by the main drive source and the carrier rotated by the adjustment drive source are different, the amount of eccentricity of the center point of the rotating part with respect to the rotation center axis of the input shaft changes, and the rotation radius adjustment mechanism The radius of rotational motion also changes.

  Then, as the radius of the rotational motion of the rotational radius adjusting mechanism changes, the swing width of the swing end of the swing link also changes, and the gear ratio is switched to control the rotational speed of the output shaft relative to the input shaft.

  In such a continuously variable transmission, the distance between the center point of the equilateral triangle whose apex is the center axis of the three pinions and the input center axis of the input shaft, and the center point of the equilateral triangle and the center point of the rotating part By setting the distance to be equal to each other, the rotation center axis of the input shaft and the center point of the rotating part can be overlapped to make the amount of eccentricity zero. When the amount of eccentricity is 0, even when the input shaft is rotating, the swing width of the swing end of the swing link is 0, and the output shaft is not rotated.

JP 2012-1048 A

  In the four-bar linkage type continuously variable transmission, the balance of the input shaft including the cam portion is important for suppressing noise and vibration. However, the input shaft including the cam portion of the continuously variable transmission of the four-bar linkage mechanism is coupled with the complexity of the structure of the continuously variable transmission itself, so that there is almost no place to add a weight for adjusting the balance of the input shaft. Also, for the same reason, there is almost no place for providing a weight for adjustment by attaching a weight in advance and trimming the weight.

  In view of the above, it is an object of the present invention to provide a continuously variable transmission that can easily adjust the balance of an input shaft, and a method for adjusting the balance of an input shaft.

  In order to achieve the above object, the present invention provides an input shaft that is rotated by the driving force of a main drive source, an output shaft that is arranged in parallel to the rotation center axis of the input shaft, and a swing that is supported by the output shaft. A lever crank mechanism that converts a rotational motion of the input shaft into a swing motion of the swing link, and a swing link that is about to rotate relative to the output shaft. The swinging link is fixed to the output shaft, and the swinging link is idled with respect to the output shaft when the swinging link is about to rotate relative to the output shaft. The lever crank mechanism is a continuously variable transmission that includes a turning radius adjusting mechanism capable of adjusting a turning radius and a connecting rod that connects the turning radius adjusting mechanism and the swing link. The turning radius adjusting mechanism A cam portion that rotates integrally with the input shaft, and a mating surface hole is provided in a mating surface of the adjacent cam portions, and the balance of the input shaft including the cam portion is adjusted in the mating surface hole. The adjustment member for use can be inserted freely.

  The present invention also provides an input shaft that rotates within the case by transmission of the driving force of the main drive source, an output shaft that is arranged in parallel to the rotation center axis of the input shaft, and a swing that is supported by the output shaft. A lever crank mechanism that converts a rotational motion of the input shaft into a swing motion of the swing link, and a swing link that is about to rotate relative to the output shaft. The swinging link is fixed to the output shaft, and the swinging link is idled with respect to the output shaft when the swinging link is about to rotate relative to the output shaft. A rotation prevention mechanism, and the lever crank mechanism includes a rotation radius adjustment mechanism capable of adjusting a rotation radius, and a connecting rod connecting the rotation radius adjustment mechanism and the swing link, and the rotation radius adjustment mechanism. Is integrated with the input shaft A method of adjusting a balance of an input shaft including the cam portion of a continuously variable transmission including a rotating cam portion, wherein the cam portion includes a mating surface on at least one of the mating surfaces where the adjacent cam portions overlap each other. A balance inspection step in which a hole is provided and the balance of the input shaft including the cam portion is inspected; and when the balance inspection step determines that the balance of the input shaft needs to be adjusted, And an insertion step of inserting an adjusting member whose weight is adjusted to a predetermined weight in order to adjust the balance.

  According to the present invention, a mating surface hole is provided in a mating surface where adjacent cam portions overlap each other, and an adjusting member for adjusting the balance of the input shaft is inserted into the mating surface hole. Accordingly, it is not necessary to add a weight to the outer surface of the input shaft including the cam portion, and it is only necessary to insert the adjusting member adjusted to a predetermined weight into the mating surface hole, so that the input shaft balance can be easily adjusted. be able to.

  In the present invention, the turning radius adjusting mechanism includes a rotating portion that is rotatably provided on the cam portion in a state of being eccentric with respect to the cam portion, and a mating surface of the adjacent cam portions is the rotating portion. When located at the center, it is preferable that the center of gravity of the adjustment member is located on the mating surface. According to this configuration, the center of the rotating part and the direction of the centrifugal force of the adjusting member generated when the input shaft rotates coincide with each other, and the rotating part can be rotated with good balance.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows embodiment of the continuously variable transmission of this invention in a partial cross section. Explanatory drawing which shows the lever crank mechanism of this embodiment. Explanatory drawing which shows the change of the rotation radius of this embodiment. 3A shows a state where the turning radius is maximum, FIG. 3B shows a case where the turning radius is medium, FIG. 3C shows a case where the turning radius is small, and FIG. 3D shows a state where the turning radius is zero. Explanatory drawing which shows the change of the rocking | fluctuation range of the rocking | fluctuation link with respect to the change of the rotation radius of this embodiment. FIG. 4A shows the swing range when the turning radius is the maximum, FIG. 4B shows the inside of the turning radius, and FIG. 4C shows the swing range when the turning radius is small. The perspective view which shows the mating surface and adjustment member of a cam part of this embodiment. Sectional drawing which expands and shows the mating face hole and adjustment member of this embodiment.

  With reference to FIGS. 1 to 6, an embodiment of a continuously variable transmission according to the present invention and a balance adjusting method for an input shaft of the continuously variable transmission will be described. The continuously variable transmission according to the present embodiment is a transmission capable of setting the speed ratio h (h = rotational speed of the input shaft / rotational speed of the output shaft) to infinity (∞) and the rotational speed of the output shaft to “0”. It is a kind of so-called IVT (Infinity Variable Transmission).

  Referring to FIG. 1, a continuously variable transmission 1 of a four-bar linkage mechanism type is centered on a rotation center axis P1 by transmitting a driving force from a main driving source ENG such as an engine such as an internal combustion engine or an electric motor. An input shaft end 2a that rotates, an output shaft 3 that is arranged in parallel to the rotation center axis P1 and transmits rotational power to drive wheels (not shown) of the vehicle via a differential gear (not shown), and a rotation center axis P1 And six turning radius adjusting mechanisms 4 provided on the top. A propeller shaft may be provided instead of the differential gear.

  1 and 2, each turning radius adjusting mechanism 4 includes a cam disk 5 as a cam part and a rotating disk 6 as a rotating part. The cam disks 5 have a disk shape, are eccentric from the rotation center axis P <b> 1, and are provided in each rotation radius adjustment mechanism 4 so as to form one set with respect to one rotation radius adjustment mechanism 4. . The cam disk 5 is provided with a through hole 5a penetrating in the direction of the rotation center axis P1. Further, the cam disk 5 is opened in a direction opposite to the direction decentered with respect to the rotation center axis P1, and a notch hole 5b for communicating the outer peripheral surface of the cam disk 5 with the inner peripheral surface constituting the through hole 5a. Is provided.

  Each set of cam disks 5 is arranged so as to make a round in the circumferential direction of the rotation center axis P <b> 1 with six sets of cam disks 5 with a phase difference of 60 degrees.

  The cam disk 5 is formed integrally with the cam disk 5 of the adjacent turning radius adjusting mechanism 4 to constitute an integrated cam portion 5c. The integrated cam portion 5c may be formed by integral molding, or may be integrated by welding two cam portions. A pair of cam disks 5 of each turning radius adjusting mechanism 4 are fixed by bolts (not shown). The cam disk 5 located on the most main drive source side on the rotation center axis P1 is formed integrally with the input shaft end 2a. In this way, the input shaft 2 including the cam disk 5 is configured by the input shaft end portion 2 a and the plurality of cam disks 5.

  The input shaft 2 includes an insertion hole 60 formed by connecting the through holes 5 a of the cam disk 5. Thereby, the input shaft 2 is configured in a hollow shaft shape in which one end opposite to the main drive source ENG is open and the other end is closed. The cam disk 5 located at the other end on the main drive source side is formed integrally with the input shaft end 2a. As a method of integrally forming the cam disk 5 and the input shaft end 2a, integral molding may be used, or the cam disk 5 and the input shaft end 2a may be integrated by welding. .

  Each set of cam disks 5 is rotatably fitted with a disk-shaped rotating disk 6 having a receiving hole 6a for receiving the cam disk 5 in an eccentric state.

  As shown in FIG. 2, the rotating disk 6 has a cam disk 5 center point P2 and a rotating disk 6 center point P3, a distance Ra between the rotation center axis P1 and the center point P2, and the center point P2 and the center point. It is eccentric with respect to the cam disk 5 so that the distance Rb of P3 is the same.

  The receiving hole 6 a of the rotating disk 6 is provided with internal teeth 6 b that are positioned between the pair of cam disks 5.

  In the insertion hole 60 of the camshaft 51, the pinion 70 is positioned so as to be concentric with the rotation center axis P <b> 1 and corresponding to the inner teeth 6 b of the rotary disk 6, and the pinion 70 rotates relative to the input shaft 2 having the cam disk 5. It is arranged to be free. The pinion 70 is formed integrally with the pinion shaft 72. The pinion 70 may be configured separately from the pinion shaft 72, and the pinion 70 may be connected to the pinion shaft 72 by spline coupling. In the present embodiment, the term “pinion 70” is defined as including the pinion shaft 72.

  The pinion 70 meshes with the internal teeth 6 b of the rotating disk 6 through the notch hole 5 b of the cam disk 5. The pinion shaft 72 is provided with a pinion bearing 74 positioned between the adjacent pinions 70. The pinion shaft 72 supports the input shaft 2 via the pinion bearing 74. A differential mechanism 8 composed of a planetary gear mechanism or the like is connected to the pinion shaft 72. The driving force of the adjusting drive source 14 is transmitted to the pinion 70 via the differential mechanism 8.

  Since the rotating disk 6 is eccentric with respect to the cam disk 5 such that the distance Ra and the distance Rb are the same, the center point P3 of the rotating disk 6 is positioned on the same axis as the rotation center axis P1. Thus, the distance between the rotation center axis P1 and the center point P3, that is, the eccentricity R1 can be set to “0”.

  The peripheral edge of the rotary disk 6 is provided with a large-diameter input-side annular portion 15a at one end (on the input shaft 2 side), and at the other end (output shaft 3 side) at the end of the input-side annular portion 15a. An input side annular portion 15a of a connecting rod 15 having a small-diameter output side annular portion 15b is externally fitted rotatably via a connecting rod bearing 16 comprising two ball bearings arranged side by side in the axial direction. Six swing links 18 corresponding to the connecting rod 15 are provided on the output shaft 3 via a one-way clutch 17. In the present embodiment, the swing link 18 also has a function as an outer ring of the one-way clutch 17.

  The one-way clutch 17 is provided between the swing link 18 and the output shaft 3. When the swing link 18 is about to rotate relative to the output shaft 3 on one side, the swing link 18 is connected to the output shaft. 3 (fixed state), and the rocking link 18 is idled with respect to the output shaft 3 (idle state) when trying to rotate relatively to the other side.

  The swing link 18 is formed in an annular shape, and a swing end portion 18 a connected to the output-side annular portion 15 b of the connecting rod 15 is provided below the swing link 18. The swing end portion 18a is provided with a pair of protruding pieces 18b protruding so as to sandwich the output-side annular portion 15b in the axial direction. The pair of projecting pieces 18b are provided with insertion holes 18c corresponding to the inner diameter of the output-side annular portion 15b. A connecting pin 19 as a swing shaft is inserted into the insertion hole 18c and the output side annular portion 15b. Thereby, the connecting rod 15 and the swing link 18 are connected.

  In the present embodiment, the oscillating end 18a is disposed below the output shaft 3 so that the oscillating end 18a of the oscillating link 18 is immersed in the oil reservoir of lubricating oil collected below the case 80. Has been. As a result, the oscillating end 18a can be lubricated with the oil reservoir, and the lubricating oil in the oil reservoir can be lifted by the oscillating motion of the oscillating link 18 to lubricate other components of the continuously variable transmission 1. it can.

  In the description of the present embodiment, the gear ratio is defined as the rotational speed of the input shaft / the rotational speed of the output shaft.

  FIG. 3 shows the positional relationship between the pinion shaft 72 and the rotating disk 6 in a state where the eccentric amount R1 (rotating radius) of the rotating radius adjusting mechanism 4 is changed. FIG. 3A shows a state where the eccentric amount R1 is “maximum”, and the pinion shaft is such that the rotation center axis P1, the center point P2 of the cam disk 5, and the center point P3 of the rotation disk 6 are aligned. 72 and the rotary disk 6 are located. At this time, the gear ratio h is minimized.

  FIG. 3B shows a state in which the eccentric amount R1 is set to “medium” which is smaller than that in FIG. 3A, and FIG. 3C shows a state in which the eccentric amount R1 is set to “small” which is further smaller than that in FIG. The gear ratio h is “medium” which is larger than the gear ratio h in FIG. 3A in FIG. 3B and “large” which is larger than the gear ratio h in FIG. 3B in FIG. FIG. 3D shows a state where the amount of eccentricity R1 is “0”, and the rotation center axis P1 and the center point P3 of the rotating disk 6 are located concentrically. The gear ratio h at this time is infinite (∞). The continuously variable transmission 1 of the present embodiment allows the rotation radius of the rotation radius adjustment mechanism 4 to be adjusted by changing the eccentricity R1 by the rotation radius adjustment mechanism 4.

  FIG. 4 shows a change in the swing range of the swing link 18 when the eccentric amount R1 of the turning radius adjusting mechanism 4 is changed. 4A shows the swing range of the swing link 18 when the eccentric amount R1 is the maximum, FIG. 4B shows the swing range of the swing link 18 when the eccentric amount R1 is medium, and FIG. The swing range of the swing link 18 when the eccentric amount R1 is small is shown. It can be seen from FIG. 4 that the swing range becomes narrower as the eccentric amount R1 becomes smaller. When the eccentric amount R1 becomes “0”, the swing link 18 does not swing.

  In the present embodiment, the turning radius adjusting mechanism 4, the connecting rod 15, and the swing link 18 constitute a lever crank mechanism 20 (four-bar linkage mechanism). Then, the lever crank mechanism 20 converts the rotational motion of the input shaft 2 into the swing motion of the swing link 18. The continuously variable transmission 1 of this embodiment includes a total of six lever crank mechanisms 20. When the input shaft 2 is rotated and the pinion shaft 72 is rotated at the same speed as the input shaft 2 when the eccentric amount R1 is not “0”, each connecting rod 15 changes its phase by 60 degrees, and the eccentric amount R1. Accordingly, the swing link 18 swings between the input shaft 2 and the output shaft 3 by alternately pushing the swing end 18a toward the output shaft 3 or pulling it toward the input shaft 2 side.

  Since the output side annular portion 15b of the connecting rod 15 is connected to a swing link 18 provided on the output shaft 3 via a one-way clutch 17, the swing link 18 is pushed and pulled by the connecting rod 15 to swing. Then, the output shaft 3 rotates only when the swing link 18 rotates in either the pushing direction side or the pulling direction side, and the output shaft 3 rotates when the swing link 18 rotates in the other direction. Thus, the force of the swing motion of the swing link 18 is not transmitted to the swing link 18, and the swing link 18 is idled. Since each turning radius adjusting mechanism 4 is arranged with a phase changed every 60 degrees, the output shaft 3 is rotated in turn by each turning radius adjusting mechanism 4.

  A control unit (not shown) for controlling the adjustment drive source 14 is provided. The control unit is an electronic unit composed of a CPU, a memory, and the like, and the control program stored in the memory is executed by the CPU, thereby controlling the adjustment drive source 14 and the amount of eccentricity of the turning radius adjustment mechanism 4. It functions to regulate R1.

  As shown in FIG. 5, the continuously variable transmission 1 according to the present embodiment has a mating surface 80 as a surface on which one set of cam disks 5 is superimposed, and a mating surface hole 81 is provided in the mating surface 80. The mating surface holes 81 provided in each of the pair of cam disks 5 are configured in the same shape. The mating surface 80 is located at the center of the rotating disk 6.

  The cylindrical adjustment member 90 is press-fitted (inserted) into the mating surface hole 81 after adjusting the cylindrical adjustment member 90 to have a predetermined weight by cutting the inner peripheral surface thereof. At this time, the adjusting member 90 is configured so that the center of gravity of the adjusting member 90 is positioned just on the mating surface 80 by being inserted into the mating surface hole 81. In the back of the mating face hole 81, a reduced diameter portion 81a is provided which is reduced in diameter so as to prevent the inserted adjustment member 90 from falling off.

  Next, a method for adjusting the balance of the input shaft 2 including the cam disk 5 of the present embodiment will be described. First, the balance is inspected by rotating the input shaft 2 including the cam disk 5 (balance inspection step). The rotation balance inspection method is a well-known inspection method often used in engine crankshafts and the like, and thus the description thereof is omitted.

  In the balance inspection process, when it is determined that the balance needs to be adjusted, the input shaft 2 including the cam disk 5 is once disassembled and the inner peripheral surface is cut so as to obtain the required weight. The adjustment member 90 is press-fitted into the corresponding mating face hole 81 (insertion step). Then, the input shaft 2 including the cam disk 5 is assembled again. Thereafter, the balance inspection process is performed again. If balance adjustment is necessary, the insertion process is performed again. If balance adjustment is not necessary, the input shaft 2 is completed.

  According to the balance adjusting method of the continuously variable transmission 1 and the input shaft 2 of the present embodiment, there is no need to attach a weight to the outer surface of the input shaft 2 including the cam disk 5 and the adjusting member is adjusted to a predetermined weight. Therefore, the balance of the input shaft 2 can be easily adjusted.

  Further, the adjusting member 90 is press-fitted into the mating surface hole 81 so that the mating surface 80 of the adjacent cam disk 5 is positioned at the center of the rotating disk 6 and the center of gravity of the adjusting member 90 is positioned at the mating surface 80. Yes. According to such a configuration, the center of the rotating disk 6 and the direction of the centrifugal force of the adjusting member 90 generated when the input shaft 2 rotates coincide with each other, and the rotating disk 6 can be rotated with a good balance.

  In the present embodiment, the description has been given of the case in which the mating surface holes 81 corresponding to the mating surfaces 80 of the adjacent cam disks 5 are provided and the adjusting member 90 is inserted. However, the continuously variable transmission and the input shaft balance adjusting method of the present invention are not limited to this. For example, although there is a possibility that the rotational balance of the rotary disk 6 is somewhat impaired by the centrifugal force of the adjusting member 90, the mating face hole 81 is provided only on one mating face between adjacent cam disks. The adjustment member 90 may be press-fitted.

  In the present embodiment, the input shaft end portion 2 a and the plurality of cam disks 5 constitute the input shaft 2, and the input shaft 2 is formed by connecting the through holes 5 a of the cam disk 5. Explained what provided.

  However, the input shaft of the present invention is not limited to this. For example, as a component part of the input shaft, a hollow input shaft core portion having an insertion hole whose one end is open and the other end is closed is provided. An input having a plurality of cam disks is formed by forming a through hole larger than that of the present embodiment so that the input shaft core portion can be inserted into the disk, and by connecting each cam disk to the outer peripheral surface of the input shaft core portion by spline. An axis may be configured.

  In this case, the hollow input shaft core portion is provided with a notch hole corresponding to the notch hole of the cam disk. Then, the pinion inserted into the input shaft core part meshes with the internal teeth of the rotating disk via the notch hole of the input shaft core part and the notch hole of the cam disk.

  In this embodiment, the one-way clutch 17 is used as the one-way rotation prevention mechanism. However, the one-way rotation prevention mechanism of the present invention is not limited to this. For example, torque is applied from the swing link to the output shaft. A two-way clutch configured to be able to switch the rotation direction with respect to the output shaft of the swing link capable of transmission may be used.

1 continuously variable transmission 2 input shaft 2a input shaft end 2b input shaft bearing 3 output shaft 3a output shaft bearing 4 turning radius adjusting mechanism 5 cam disk (cam portion)
5a Through-hole 5b Notch hole 5c Integrated cam part 6 Rotating disk (rotating part)
6a Receiving hole (inner circumference)
6b Internal gear 8 Differential mechanism (Planetary gear mechanism)
12 Stepped pinion 14 Adjustment drive source (motor)
15 Connecting rod 15a Input side annular portion 15b Output side annular portion 16 Connecting rod bearing 17 One-way clutch 18 Swing link (outer ring)
18a Swing end 18b Projection piece 18c Insertion hole 19 Connection pin 20 Lever crank mechanism (four-bar linkage mechanism)
60 Insertion hole 70 Pinion 72 Pinion shaft 74 Pinion bearing 80 Matching surface 81 Matching surface hole 81a Reduced diameter portion 90 Adjusting member P1 Rotation center axis P2 Center point P3 of the cam disc Distance Rb P2 between the center points Ra P1 and P2 of the disc P3 distance R1 Eccentricity (distance between P1 and P3)

Claims (4)

An input shaft that rotates by the driving force of the main drive source;
An output shaft disposed parallel to the rotation center axis of the input shaft;
A lever crank mechanism having a swing link supported by the output shaft, and converting the rotational motion of the input shaft into the swing motion of the swing link;
When the swing link is about to rotate relative to the output shaft, the swing link is fixed to the output shaft, and the swing link is relative to the other relative to the output shaft. A one-way rotation prevention mechanism that idles the swing link with respect to the output shaft when attempting to rotate,
The lever crank mechanism is a continuously variable transmission including a rotation radius adjustment mechanism capable of adjusting a rotation radius, and a connecting rod connecting the rotation radius adjustment mechanism and the swing link,
The turning radius adjusting mechanism includes a cam portion that rotates integrally with the input shaft,
A mating surface hole is provided in at least one of the mating surfaces of the adjacent cam portions,
A continuously variable transmission, wherein an adjustment member for adjusting the balance of the input shaft including the cam portion can be freely inserted into the mating surface hole. The continuously variable transmission according to claim 1,
The turning radius adjusting mechanism includes a rotating portion provided rotatably on the cam portion in a state of being eccentric with respect to the cam portion,
The mating surface of the cam portion is configured to be located at the center of the rotating portion,
The continuously variable transmission, wherein the mating surface hole is configured such that the center of gravity of the adjusting member is positioned on the mating surface. An input shaft that rotates by the driving force of the main drive source;
An output shaft disposed parallel to the rotation center axis of the input shaft;
A lever crank mechanism having a swing link supported by the output shaft, and converting the rotational motion of the input shaft into the swing motion of the swing link;
When the swing link is about to rotate relative to the output shaft, the swing link is fixed to the output shaft, and the swing link is relative to the other relative to the output shaft. A one-way rotation prevention mechanism that idles the swing link with respect to the output shaft when attempting to rotate,
The lever crank mechanism includes a turning radius adjusting mechanism capable of adjusting a turning radius, and a connecting rod connecting the turning radius adjusting mechanism and the swing link,
The rotation radius adjustment mechanism is a balance adjustment method for an input shaft including the cam portion of a continuously variable transmission including a cam portion that rotates integrally with the input shaft,
The cam portion is provided with a mating surface hole in at least one of the mating surfaces where the adjacent cam portions overlap.
A balance inspection step of inspecting the balance of the input shaft including the cam portion;
When it is determined in the balance inspection step that the balance of the input shaft needs to be adjusted, an insertion member is inserted into the mating surface hole to adjust the weight to a predetermined weight to adjust the balance. And a balance adjusting method for the input shaft. The input shaft balance adjusting method according to claim 3,
The turning radius adjusting mechanism includes a rotating portion provided rotatably on the cam portion in a state of being eccentric with respect to the cam portion,
The mating surface hole is formed in both adjacent cam portions, and defines a space for inserting the adjusting member between the adjacent mating surface holes,
The mating surface of the cam portion is located at the center of the rotating portion,
In the inserting step, the balance adjustment method for the input shaft, wherein the center of gravity of the adjusting member is inserted on the mating surface.