JP2015132321A - Infinity variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infinity variable transmission capable of ensuring a large change rate of a radius of rotation of a lever crank mechanism with respect to a rotation angle of a rotational section even on an OD side.SOLUTION: An infinity variable transmission 1 comprises a lever crank mechanism 20 converting a rotational motion of an input shaft 2 to a swing motion of a swing link 18 pivotally supported by an output shaft 3. In the lever crank mechanism 20, a radius-of-rotation adjustment mechanism 4 capable of adjusting a radius of rotation R1 is coupled to the swing link 18 by a connecting rod 15. The radius-of-rotation adjustment mechanism 4 includes a cam disc 5 integrally rotating with the input shaft 2 in an eccentric state; a pinion 70 rotated relatively to and concentric with the input shaft 2; and a rotary disc 76 rotatably supported by the cam disc 5 in an eccentric state and having inner teeth 6b engaged with the pinion 70. Pitch circle radii 70c and 6c of the pinion 70 and the inner teeth 6b in a portion where the pinion 70 is engaged with the inner teeth 6b when the radius of rotation R1 is large are larger than those when the radius of rotation R1 is small.

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

  Each of the first and second transmissions described in Patent Document 1 corresponds to the continuously variable transmission. The input shaft, output shaft, turning radius adjustment mechanism, swing link and connecting rod of the transmission 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 adjustment mechanism is transmitted concentrically to the input shaft by transmitting the driving force from the disk-shaped cam part that rotates integrally with the input shaft in an eccentric state with respect to the input shaft and the adjustment drive source. It is composed of a rotatable pinion and a disk-shaped rotating part that is rotatably connected to a connecting rod. The rotating portion is rotatably supported by the cam portion while being eccentric with respect to the cam portion. The rotating portion is provided with an internal gear that meshes with the pinion.

  The turning radius R1 of the lever crank mechanism is a distance between the center point of the rotating part and the rotation center axis of the input shaft, and determines the speed ratio of the continuously variable transmission. The turning radius R1 is adjusted by the turning radius adjusting mechanism using the driving force of the adjusting drive source.

  That is, when the pinion is driven by the adjustment drive source at the same speed as the rotation speed of the input shaft, the rotating part rotates integrally with the cam part. In this case, the radius r1 of the rotational motion on the input shaft side is constant, and the driving force is transmitted from the input shaft to the output shaft at a constant speed ratio.

  When there is a difference between the rotational speed of the input shaft and the rotational speed of the pinion, the rotating part rotates around the cam part. The rotation radius R1 changes according to the rotation angle θ. Therefore, by rotating the pinion faster or slower with respect to the input shaft and then returning to the same speed, the rotation angle θ can be selected, the rotation radius R1 can be changed, and the gear ratio can be controlled.

  For example, the gear ratio can be set to the maximum or infinite by selecting the rotation angle θmin at which the rotation radius R1 is minimum, for example, zero, as the rotation angle θ. Further, the gear ratio can be set to the minimum by selecting the rotation angle θmax that maximizes the rotation radius R1.

JP2013-24382A

  However, according to the conventional continuously variable transmission, the change characteristic of the rotation radius R1 with respect to the rotation angle θ is relatively steep on the θmin side where the gear ratio is large, and is gradual on the θmax side where the gear ratio is small.

  For this reason, at the speed ratio on the OD (overdrive) side where the speed ratio is small, the rate of change of the rotation radius R1 with respect to the rotation angle θ is small, so that it is not possible to obtain good responsiveness when shifting. In order to obtain good responsiveness, it is necessary to drive the pinion at a higher speed and increase the load of the adjusting drive source by a smaller change rate of the rotation radius R1 with respect to the rotation angle θ.

  In view of the above, an object of the present invention is to provide a continuously variable transmission in which the rate of change of the rotation radius of the lever crank mechanism with respect to the rotation angle of the rotating portion is large even on the OD side.

  The continuously variable transmission according to the present invention includes an input unit to which a driving force from a main drive source is transmitted, an output shaft disposed in parallel with the rotation center axis of the input unit, and a swing supported by the output shaft. A lever crank mechanism that converts a rotational motion of the input unit into a swing motion of the swing link, and the swing link 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, wherein the lever crank mechanism includes a rotation radius adjustment mechanism having an adjustable rotation radius, and a connecting rod connecting the rotation radius adjustment mechanism and the swing link, and the rotation radius adjustment mechanism. Is eccentric with respect to the rotation center axis A cam part that rotates in a state, a pinion concentric with the rotation center axis and rotatable relative to the cam part, and rotatably supported by the cam part in an eccentric state with respect to the cam part. A continuously variable transmission that includes a rotating portion that is rotatably connected to the connecting rod, and the pitch circle radius of the pinion and the internal gear at a position where the pinion and the internal gear mesh with each other, It increases according to the increase of the turning radius.

  In the configuration of the present invention, the rotation radius R1 in the lever crank mechanism corresponds to the amount of swing motion of the swing link, that is, the gear ratio of the continuously variable transmission. When the adjustment drive source is driven so that the rotation speed of the cam portion and the rotation speed of the pinion are the same, the rotation portion and the cam portion rotate together, so the rotation radius R1 is kept constant. Is done.

  On the other hand, when the adjustment drive source is driven so that there is a difference between the rotation speed of the cam section and the rotation speed of the pinion, the rotation section rotates around the cam section around the center point of the cam section. . The rotation radius R1 changes according to the rotation angle θ. That is, when the rotation angle θ is 0 ° when the rotation radius R1 is minimum or zero, and the rotation angle θ is 180 ° when the rotation radius R1 is maximum, the range from θ to 0 ° to 180 ° is obtained. , The rotation radius R1 increases as the rotation angle θ increases.

  At this time, in the conventional continuously variable transmission, since the pitch circle radius of the pinion and the pitch circle radius of the internal gear of the cam portion are constant regardless of the rotation angle θ, the rate of change of the rotation radius R1 with respect to the rotation angle θ is , Θ is smaller when θ is larger than when θ is smaller. For this reason, the responsiveness of the gear ratio with respect to the drive amount of the adjusting drive source is relatively high on the low speed side (UD side) where the rotation radius R1 is small and relatively low on the high speed side (OD side) where the rotation radius R1 is large.

  On the other hand, in the present invention, the pitch circle radius rw1 of the pinion and the pitch circle radius rw2 of the internal gear of the cam portion change according to the position where these gears mesh with each other, that is, according to the rotation radius R1, and the rotation radius R1. It increases with increasing.

  As a result, the rate of change of the rotation radius R1 with respect to the rotation angle θ can be made larger on the OD side and smaller on the UD side. Therefore, it is possible to reduce the operating speed of the adjustment drive source on the OD side and improve the response to the shift instruction, and to reduce the load of the adjustment drive source on the UD side.

  In the present invention, the pitch circle radius may increase gradually according to the increase in the rotation radius. According to this, the change characteristic of the rotation radius R1 with respect to the rotation angle θ becomes smooth.

It is explanatory drawing which shows the embodiment of the continuously variable transmission of this invention in a partial cross section. It is explanatory drawing which shows the lever crank mechanism of this embodiment. It is 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. It is 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. 4A shows the swing range when the eccentric amount R1 is the maximum, FIG. 4B shows the inside of the turning radius, and FIG. 4C shows the swinging range where the turning radius is small. It is explanatory drawing which shows the pinion and the pitch circle radius of an internal tooth in the turning radius adjustment mechanism of this embodiment. FIG. 5A shows a state where the pinion and the internal teeth mesh when the rotation radius R1 is 0, and FIG. 5B shows a state where the pinion and the internal teeth mesh when the rotation radius R1 is maximum. It is explanatory drawing which shows the change of the location where the pinion and the internal teeth mesh in the rotation radius adjustment mechanism of this embodiment, changing the rotation angle θ of the rotary disk by 45 °. 6A shows a rotation angle θ of 0 °, FIG. 6B shows a rotation angle θ of 45 °, FIG. 6C shows a rotation angle θ of 90 °, FIG. 6D shows a rotation angle θ of 135 °, and FIG. 6E shows a rotation angle θ of 180 °. The state of time is shown. It is a graph which shows the change characteristic of rotation radius R1 with respect to rotation angle (theta) of the rotating disk in the rotation radius adjustment mechanism of this embodiment. It is explanatory drawing which shows the pitch circle radius of a pinion and an internal tooth in the turning radius adjustment mechanism of another embodiment of this invention. FIG. 8A shows a state where the pinion and the internal teeth mesh when the turning radius is 0, and FIG. 8B shows a state where the pinion and the internal teeth mesh when the turning radius is maximum.

  An embodiment of a four-bar linkage type continuously variable transmission according to the present invention will be described with reference to FIGS. 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 input shaft 2, the pinion 70 is positioned so as to be concentric with the rotation center axis P <b> 1 and corresponding to the inner tooth 6 b of the rotating 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.

  When the rotation speed of the input shaft 2 to which the cam disk 5 is fixed and the rotation speed of the pinion shaft 72 are the same, the rotation disk 6 rotates together with the cam disk 5. When there is a difference between the rotational speed of the input shaft 2 and the rotational speed of the pinion shaft 72, the rotating disk 6 rotates the periphery of the cam disk 5 around the center point P <b> 2 of the cam disk 5.

  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.

  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 projecting pieces 18b projecting 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.

  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. 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.

  Further, the continuously variable transmission according to this embodiment includes a control unit (not shown) that controls the adjustment drive source 14. 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.

  FIG. 5 shows the pitch circle radius rw1 of the pinion 70 and the pitch circle radius rw2 of the inner teeth 6b of the rotary disk 6 in the turning radius adjusting mechanism 4. In FIG. 5A, the pitch circle radius rwa of the pinion 70 and the pitch circle radius rwb of the internal tooth 6b at the position where the pinion 70 and the internal tooth 6b mesh with each other when the eccentric amount R1 is “0” in the geared neutral (GN) state. It is shown.

  FIG. 5B shows the pitch circle radius rwc of the pinion 70 and the pitch circle radius rwd of the internal teeth 6b at the position where the pinion 70 and the internal teeth 6b mesh with each other in the overdrive (OD) state where the eccentricity R1 is the maximum. Has been.

  As shown in FIG. 5, the internal teeth 6b are provided in a range necessary for the eccentric amount R1 to change from “0” to “maximum”. This range corresponds to a range of a central angle of 180 ° centering on the center point P2 of the cam disk 5 (see FIG. 2). The pinion 70 is configured to correspond to the internal teeth 6b in this range with less than one rotation (360 °).

  The pitch circle radius rw1 of the pitch circle 70c of the pinion 70 gradually increases from the portion engaged when the eccentric amount R1 in FIG. 5A is “0” to the portion engaged when the eccentric amount R1 in FIG. 5B is “maximum”. ing. Correspondingly, the pitch circle radius rw2 of the pitch circle 6c of the internal tooth 6b is such that the eccentric amount R1 of FIG. 5B is “maximum” from one end side when the eccentric amount R1 of FIG. 5A is “0”. It gradually increases toward the other end meshing with the case.

  In other words, the pitch circle radius rw1 of the pinion 70 and the pitch circle radius rw2 of the internal teeth 6b at locations where they mesh with each other change according to the eccentric amount R1 that is the rotation radius R1 of the lever crank mechanism 20. The pitch circle radii rw1 and rw2 are larger when the eccentric amount R1 is larger than when the eccentric amount R1 is small, and gradually increase as the eccentric amount R1 increases.

  FIG. 6 shows changes in the pitch circle radii rw1 and rw2 at locations where the pinion 70 and the internal teeth 6b in the turning radius adjusting mechanism 4 are engaged, while changing the rotation angle θ of the rotating disk 6 around the pinion 70. 6A to 6E show pitch circle radii rw1 and rw2 at locations where the pinion 70 and the internal teeth 6b mesh when the rotation angle θ is 0 °, 45 °, 90 °, 135 °, and 180 °, respectively. Yes.

  That is, FIG. 6A shows a case of geared neutral (GN) in which the amount of eccentricity R1 is “0” (speed ratio is infinite). FIG. 6B shows the case of underdrive (UD) with a large gear ratio. FIG. 6C shows the case of a top drive (TD) in which the gear ratio is small (the vehicle can travel at the maximum speed). FIG. 6E shows the case of overdrive (OD) in which the speed ratio is minimum.

  As described above, when the amount of eccentricity R1 changes, the rotary disk 6 has a distance Ra between the rotation center axis P1 of the pinion 70 (input shaft 2) and the center point P2 of the cam disk 5, and the center point P2 and the rotation disk. 6 rotates around the pinion 70 so that the distance Rb to the center point P3 is the same (see FIG. 2). The rotation angle θ is 180 ° when the eccentricity R1 is “maximum” when the value when the eccentricity R1 is “0” is 0 °.

  Since the distance Ra is constant, when the amount of eccentricity R1 changes from “0” to “maximum”, as shown in FIG. 6, the internal teeth are increased by the same amount as the amount by which the pitch circle radius rw1 of the pinion 70 gradually increases. The pitch circle radius rw2 of 6b also increases gradually.

  FIG. 7 shows the change characteristic of the eccentric amount R1 with respect to the rotational angle θ of the rotating disk 6, with the rotational angle θ when the eccentric amount R1 is “0” being 0 °. In FIG. 7, the change characteristic in the present embodiment in which the pitch circle radii rw1 and rw2 increase gradually is shown by a graph curve 73 (solid line). For comparison, a graph curve 71 (dotted line) shows a change characteristic in the conventional case where the pitch circle radii rw1 and rw2 do not change.

  As indicated by the graph curve 71, in the conventional case, since the pitch circle radii rw1 and rw2 of the pinion and the internal gear are constant regardless of the rotation angle θ, the rate of change of the eccentricity R1 with respect to the rotation angle θ is the rotation angle. When θ is small, it is relatively large, and when θ is large, it is relatively small. For this reason, the responsiveness of the gear ratio with respect to the drive amount of the adjustment drive source 14 is relatively high on the low speed side (UD side) where the eccentric amount R1 is small, and relatively low on the high speed side (OD side) where the eccentric amount R1 is large. .

  For this reason, when no measures are taken, it is impossible to obtain a good response ratio of the gear ratio with respect to kick-down or the like. In order to obtain good responsiveness, it is necessary to drive the pinion 70 at a higher speed and increase the load of the adjustment drive source 14 by the amount of change in the eccentric amount R1 with respect to the rotation angle θ.

  Further, in the transmission ratio on the UD (underdrive) side, it is required to maintain a higher driving torque than the responsiveness of the high transmission ratio. For this reason, it is preferable that the change of the eccentricity R1 with respect to the change of the rotation angle θ is gentle. In that case, the load of the adjustment drive source 14 can be reduced. However, contrary to this requirement, as described above, the change characteristic of the eccentric amount R1 with respect to the rotation angle θ is steep on the UD (underdrive) side.

  On the other hand, according to the present embodiment, as indicated by the graph curve 73, the pitch circle radius rw1 of the pinion 70 and the pitch circle radius rw2 of the internal teeth 6b of the rotary disk 6 are the places where these gears mesh, that is, It changes according to the amount of eccentricity R1, and is larger when the amount of eccentricity R1 is larger than when the amount of eccentricity R1 is small.

  Thereby, the change of the eccentricity R1 with respect to the rotation angle θ becomes larger on the OD side and becomes smaller on the UD side. As a result, the change characteristic of the eccentricity R1 with respect to the rotation angle θ becomes more linear. Therefore, it is possible to reduce the operation speed of the adjustment drive source 14 on the OD side and improve the response to the shift instruction, and to reduce the load of the adjustment drive source 14 on the UD side.

  FIG. 8 shows the pitch circle radius rw1 of the pinion 75 and the pitch circle radius rw2 of the internal teeth 76b of the rotary disk 76 in the turning radius adjustment mechanism of the continuously variable transmission according to another embodiment of the present invention. In FIG. 8A, the pitch circle radius rwe of the pinion 75 and the pitch circle radius rwf of the internal tooth 76b at a position where the pinion 75 and the internal tooth 76b mesh with each other when the eccentric amount R1 is “0” in the geared neutral (GN) state. It is shown.

  FIG. 8B shows the pitch circle radius rwg of the pinion 75 and the pitch circle radius rwh of the internal tooth 76b at a position where the pinion 75 and the internal tooth 76b mesh with each other in the overdrive (OD) state where the eccentricity R1 is the maximum. Has been.

  As shown in FIG. 8, the internal teeth 76b are provided in a range necessary for the eccentric amount R1 to change from “0” to “maximum”. This range corresponds to a range of a central angle of 180 ° centering on the center point P2 of the cam disk 5 (see FIG. 2). The pinion 75 is configured to correspond to the internal teeth 76b in this range with less than one rotation (360 °).

  The value of the pitch circle radius rw1 of the pitch circle 75c of the pinion 75 is a portion corresponding to a half of the range of the internal teeth 76b corresponding to the central angle of 180 ° starting from the portion engaged in FIG. 8A. Is rwe, and rwg in the part corresponding to the other half of the range until reaching the engaged part in FIG. 8B. In other words, the pitch circle 75c is configured by dividing the pitch circle radius substantially equally by the rwe portion and the rwg portion. Corresponding to this, the pitch circle 76c of the internal teeth 76b is also configured by dividing the pitch circle radius rw2 substantially equally by the portions of rwf and rwh.

  Also in this case, the pitch circle radius rw1 of the pinion 75 and the pitch circle radius rw2 of the internal teeth 76b at the locations where they mesh with each other change according to the eccentric amount R1, and are larger when the eccentric amount R1 is smaller than when the eccentric amount R1 is small. . However, the change is in two stages.

  In this case as well, it is possible to reduce the operating speed of the adjustment drive source 14 on the OD side and improve the response to the shift instruction, and to reduce the load of the adjustment drive source 14 on the UD side. Further, since the pitch circle radii rw1 and rw2 of the pinion 75 and the inner teeth 76b change in two stages, the pinion 75 and the inner teeth 76b can be formed relatively easily.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment. For example, in the above 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 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, and a through hole is provided so that the input shaft core portion can be inserted into a disk-shaped cam disk. May be formed larger than that of the present embodiment, and each cam disk may be splined to the outer peripheral surface of the input shaft core to constitute an input shaft including a plurality of cam disks.

  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 the above 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.

  Further, the rotation angle θ of the rotary disk 6 when the eccentric amount R1 is the maximum may not be 180 °. For example, when only the speed change ratio when the rotation angle θ is 150 ° is used, the maximum eccentricity R1 may be set to a value when the rotation angle θ is 150 °.

  Alternatively, the input unit may be a pinion, the driving force of the main driving source may be transmitted to the pinion, and the driving force of the adjusting driving source may be transmitted to the cam disk.

  DESCRIPTION OF SYMBOLS 1 ... Continuously variable transmission, 2 ... Input shaft, 3 ... Output shaft, 4 ... Turning radius adjustment mechanism, 5 ... Cam disk (cam part), 6 ... Rotating disk (rotating part), 6b ... Internal tooth (internal gear) , 6c, 70c, 75c, 76c ... pitch circle, 14 ... adjusting drive source, 15 ... connecting rod, 17 ... one-way clutch (one-way rotation prevention mechanism), 18 ... swing link, 20 ... lever crank mechanism (four sections) Link mechanism), 70, 75 ... pinion, 76 ... rotating disk (rotating part), P1 ... rotating center axis, P2 ... center point of cam disk, P3 ... center point of rotating disk, R1 ... eccentricity (rotating radius), Ra: distance between P1 and P2, Rb: distance between P2 and P3, rw1, rw2, rwa-rwh: pitch circle radius.

Claims (2)

An input unit to which the driving force from the main driving source is transmitted;
An output shaft disposed parallel to the rotation center axis of the input unit;
A lever crank mechanism pivotally supported by the output shaft, and a lever crank mechanism for converting the rotational motion of the input portion into the rocking motion of the rocking 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 rotation radius adjustment mechanism having an adjustable rotation radius, and a connecting rod that connects the rotation radius adjustment mechanism and the swing link.
The turning radius adjusting mechanism includes:
A cam portion that rotates eccentrically with respect to the rotation center axis;
A pinion concentric with the rotation center axis and rotatable relative to the cam portion;
A continuously variable transmission that includes an internal gear that is rotatably supported by the cam portion in an eccentric state with respect to the cam portion, meshes with the pinion, and is rotatably connected to the connecting rod. There,
A continuously variable transmission, wherein a pitch circle radius of the pinion and the internal gear at a position where the pinion and the internal gear mesh with each other increases as the rotational radius increases. 2. The continuously variable transmission according to claim 1, wherein the pitch circle radius increases gradually as the turning radius increases.