JPH0552246A - Concave frictional wheel type continuously variable transmission mechanism - Google Patents

Abstract

PURPOSE:To reduce dimension and weight and spread a speed change-enabled surface by fixing a concave frictional wheel having an arcuate surface on an input shaft side, installing a transmission rotary wheel through a universal joint on an output shaft side, and improving the balance of a frictional wheel type continuously variable transmission mechanism. CONSTITUTION:A recessed arcuate surface 3 of a recessed surface frictional wheel 4 fixed on an input shaft 1 has a recessed arcuate surface having the center along the same circumference having the step difference of an output shaft 2 as radius, and the range permitting the contact with a transmission rotary wheel 5 which is inscribed with the recessed arcuate surface forms an arcuate surface ranging from the position closest to the edge of the recessed arcuate surface 3 to the position closest to the same circumference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fixes a concave friction wheel having a concave arc surface on one of the two shafts constituting the input and output shafts, and the inclination angle of the shaft on the other shaft. The present invention relates to a concave friction wheel type continuously variable transmission mechanism in which a transmission rotary wheel that can be changed and is inscribed in the concave arc surface is attached to transmit power between an input and an output shaft.

[0002]

2. Description of the Related Art In a concave friction wheel type continuously variable transmission,
Fix a concave friction wheel with a transmission surface formed into a concave spherical surface on the input and output shaft sides, and attach a rotary transmission wheel inscribed to the concave spherical surface of the concave friction wheel to the shaft of the output shaft via a worm mechanism.
Japanese Patent Application Laid-Open No. 2-203056 discloses, for example, a transmission in which the rotation between the input and output shafts is transmitted in a variable speed manner.

In addition, a friction drive wheel having a convex spherical surface is attached to the input shaft via a universal joint, and a rotary driven wheel having a concave spherical surface in contact with the convex spherical surface is fixed to the output shaft side.
For example, there is JP-A 64-21260.

[0004]

In the former case, since the worm mechanism is used as the rotation transmission means on the output shaft side, the entire machine body becomes large and the weight increases, and the gear ratio between the input and output shafts is increased. It has the disadvantage that its application is limited to very large cases.

On the other hand, in the latter case, a friction drive motor equipped with a convex spherical surface and attached to the input shaft side is swingably supported, and the contact position with a driven vehicle supported at a fixed position is made variable to shift gears. Therefore, in order to stabilize the connecting oscillator of the friction motor, the support balance of the oscillator must be specially considered.

Further, in these known examples, a plurality of sets of friction wheel type continuously variable transmission mechanisms of the same type are arranged around the single input shaft due to the above structural restrictions, and the output side of each set is arranged. There is also a drawback that it is difficult to apply to the multi type that the rotation of is concentrated on a single secondary output shaft, thereby increasing the transmission efficiency.

Therefore, it is a problem to be solved that the mechanism of this kind is simplified, has good stability and is easy to balance, and that it can be applied to the multi type as described above. It was

[0008]

Therefore, according to the present invention, a step is provided between an input shaft and an output shaft which are axially opposed to each other and whose axes are parallel to each other, and the input shaft has a step radius. A concave friction wheel provided with a concave arc surface having a radius having the center of the arc surface along the same circumference is fixed, and is inscribed at the shaft end of the output shaft through a universal joint to the concave arc surface of the concave friction wheel. A transmission rotary wheel is attached, the transmission between the input and output shafts is transmitted, and the rocking bearing having a spindle on the connecting shaft of the universal joint supports the axle of the transmission rotary wheel at the outer end of the spindle. A concave friction wheel type continuously variable transmission mechanism is provided which is provided with a shift operation means for changing the inclination angle of a transmission rotary wheel together with the above-mentioned axle.

[0009]

As described above, according to the present invention, the concave friction wheel is fixed to the input shaft side so as to rotate at a fixed position, and the rotation transmission wheel which is swingable via the universal joint is attached to the output shaft side. Since it has a good balance, it does not require a special structure for stabilization. In addition, the concave arc surface provided on the concave friction wheel is
Since it is formed on a concave arc surface having a radius centered along the same circumference with the radius formed by the step formed between the output shafts, the inclination angle of the inscribed transmission rotary shaft, that is, the range in which gear shifting is possible, is widened. , It is possible to shift in a relatively wide range.

Further, in the present invention, a plurality of sets of the input shaft and the output shaft are arranged around the primary input shaft and the secondary output shaft, and the input and output shafts of each set are respectively set to the first set. Through the rotation transmission means provided between the next input shaft and the secondary output shaft, the rotation transmission is performed in the same direction, and the concave friction wheel of the input shaft of each set and the transmission rotation of the output shaft of each set are rotated. It is provided so as to be transmitted to a secondary output shaft via a vehicle, and the transmission means is attached to the output shaft side of each of the above-mentioned sets, and at the same time the displacement angles of the transmission rotary wheels are changed to the same angle. The one connected to the transmission means is a multi-type speed change mechanism in which multiple sets of concave friction wheel type continuously variable transmission mechanisms of the same type are arranged around one input shaft, and the rotation transmission of each set is concentrated on the secondary output shaft. The device can be configured.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIGS. 1 to 4, reference numeral 1 is an input shaft that is rotationally driven by being connected to a motor or the like (not shown). Reference numeral 2 denotes an output shaft that is rotatably supported by the machine body F with its shaft end facing the input shaft 1 so that the axes are parallel to each other and a step S is provided between the input shaft 1 and the input shaft 1 as shown in FIG. 4 is the input shaft 1
As shown in FIG. 4, this concave friction wheel 4 is a concave friction wheel that is fixed to the shaft end and rotates integrally. A radius having an arc surface center r along the same circumference with the step S as the radius. A concave arc surface 3 of R is provided. Reference numeral 5 denotes a transmission rotary wheel that is rotated by the rotation of the concave friction wheel 4 by contacting a contactor 13 provided on the periphery of the concave arc surface 3, and the transmission rotary wheel 5 includes an axle 7 of the same vehicle.
Is fixed to the universal joint 8, and the output shaft 2 is driven and rotated by the input shaft 1 via the universal joint 8 and the transmission rotary wheel 5.

The axle 7 of the transmission rotary wheel 5 is shown in FIGS.
As shown in FIG. 3, a speed change gear is continuously supported on the outer end of the support shaft 6 which is rotatably supported on the machine body F by being supported by the rocking bearing 10 having the support shaft 6 coaxially with the connecting shaft 9 of the universal joint 8. The tilt angle with the axis of the output shaft 2 is changed by operating the operation means 11. The transmission rotary wheel 5 shown by the solid line in FIG. 1 is located at the minimum speed ratio position with the armature 13 in contact with the position closest to the edge of the concave arc surface 3 of the concave friction wheel 4.

The gear shift operation means 11 includes a handle shaft 14 which is laid across the upper part of the machine body F in parallel with the input and output shafts 1 and 2, a slider 15 which is screwed onto the handle shaft 14, and a slider 1.
Fit the long hole 17 at the upper end to the shaft rod 16 provided at a right angle to 5,
The shifter 19 has a lower end fitted to the outer end of the support shaft 6 through a square hole 18, and the tilt angle of the rocking bearing 10 is changed through the shifter 19 by moving the screwing position of the slider 15. The inscribed position of the transmission rotary wheel 5 with respect to the concave friction wheel 4 is changed, and the speed ratio between the input and output shafts 1 and 2 is changed.

The shift range of this friction wheel type continuously variable transmission mechanism in which the concave arc surface 3 provided on the concave friction wheel 4 is formed as described above,
As shown in FIG. 1, a wide range in which the transmission rotary wheel 5 contacting the edge of the concave arc surface 3 having a radius R approaches the bottom of the concave arc surface 3 shown by the chain line in FIG. Have.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the input shaft 1 and the concave arc surface 3 formed in the same manner as in the first embodiment are provided around the primary input shaft X and the secondary output shaft Y bearing on the same axis. The concave friction wheel 4 and the transmission rotary wheel 5 inscribed in the concave arc surface 3
And the output shaft 2 to which the transmission rotary wheel 5 is attached via the universal joint 8 and the axle 7 of the transmission rotary wheel 5 are borne by the rocking bearing 10 having the support shaft 6 on the connecting shaft 9 of the universal joint 8. , Two sets of concave friction wheel type continuously variable transmissions, which are provided with transmission means 11 at the outer end of the support shaft 6, are arranged vertically above and below the axes of the output shafts X and Y. Between the input shafts 1 and X and between the output shafts 2 and Y of the gear trains 20, 21, 2 respectively.
2 and 23 are additionally provided to serve as the input-side rotation transmission means A and the output-side rotation transmission means B.

In the second embodiment, fan gears 24 and 25 meshing with each other as shown in FIG. 6 are attached to the outer end of the support shaft 6 of the rocking bearing 10 that supports the axle 7 of the transmission rotary wheel 5. , A transmission means 12 of displacement angle for simultaneously changing the axles 7 of the transmission rotary wheels 5 of each set to the same angle is provided, and the operation of the transmission means 11 is transmitted to each transmission mechanism via the transmission means 12. It

In the second embodiment configured as described above, the rotation of the primary input shaft X is distributed to the two sets of speed change mechanisms and converted to the same speed ratio, and then the secondary output shaft Y is converted. Since they are integrated, the rotational transmission efficiency is improved.

[0018]

As described above, according to the present invention, a concave friction wheel having a concave arc surface on the input shaft side is fixed and rotated at a fixed position.
Since the transmission rotary wheel whose contact position with the concave friction transmission wheel can be changed is attached to the output shaft side through the universal joint, the machine body is well balanced and stable rotary transmission can be performed.

Further, according to the present invention, since a step is provided between the input and output shafts and the concave arc surface is formed in the concave friction wheel with a radius having the center of the spherical surface on the circumference having the step as a radius, the transmission rotary wheel It is possible to widen the contactable range with, it is possible to reduce the size and weight of the machine body, for example, the primary input shaft and the secondary output shaft coaxially bearing the transmission mechanism of the present invention. It has an excellent effect that it can be applied to a multi-type continuously variable transmission that is arranged around and operates a plurality of sets of transmission mechanisms at the same time, and collectively outputs to one output shaft. ..

[0020]

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the first embodiment of the present invention.

FIG. 3 is a right side view of the first embodiment with a part thereof cut away.

FIG. 4 is a partially cutaway plan view showing the shape of a concave arc surface of the concave friction wheel according to the present invention.

FIG. 5 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 6 is a partially cutaway front view showing a displacement angle transmitting means according to a second embodiment of the present invention.

FIG. 7 is a left side view of the second embodiment of the present invention.

[Explanation of symbols]

 1 Input Shaft 2 Output Shaft 3 Concave Arc Surface 4 Concave Friction Wheel 5 Transmission Rotating Wheel 6 Support Shaft 7 Axle 8 Universal Joint 9 Connecting Shaft 10 Swing Bearing 11 Gear Shift Operating Means 12 Displacement Angle Transmission Means 13 Contact 14 Handle Shaft 15 Slider 16 Shaft rod 17 Long hole 18 Square hole 19 Shifter 20 Gear 21 Gear 22 Gear 23 Gear 24 Gear fan 25 Fan gear A Input shaft side rotation transmission means B Output shaft side rotation transmission means F Body R Concave arc radius r Center of radius of concave arc surface S Step difference X Primary input shaft Y Secondary output shaft

Claims (2)

[Claims] 1. A step S is provided between an input shaft 1 and an output shaft 2 whose shaft ends are opposed to each other and whose axes are parallel to each other, and the input shaft 1 has the same circumference with a radius of the step S. A concave friction wheel 4 provided with a concave arc surface 3 having a radius R having a center r of the arc surface is fixed, and the concave friction surface of the concave friction wheel 4 is attached to the shaft end of the output shaft 2 via a universal joint 8. Transmission wheel 5 inscribed in 3
Rocking bearing 10 having a support shaft 6 mounted on a connecting shaft 9 of the universal joint 8 for transmission between the input and output shafts 1 and 2.
In addition, a concave friction wheel type continuously variable transmission is provided which is provided with a gear shift operation means 11 for bearing an axle 7 of the transmission rotary wheel 5 and for changing an inclination angle of the transmission rotary wheel 5 together with the axle 7 at an outer end of the support shaft 6. mechanism. 2. A plurality of sets of the input shaft 1 and the output shaft 2 are arranged around a primary input shaft X and a secondary output shaft Y which are bearings on the same axis line, and the input and output of each set are arranged. The shafts 1 and 2 are rotationally transmitted in the same direction between the primary input shaft X and the secondary output shaft Y, respectively, so that the rotation of the primary input shaft is prevented. The concave friction wheel 4 and the rotary transmission means A and B for transmitting to the secondary output shaft Y via the transmission rotary wheel 5 of the output shaft 2 of each set, and the transmission means 11 outputs the output of each set. Displacement angle transmission means 1 attached to the shaft 2 side and changing the axles 7 of the transmission rotary wheel 5 to the same angle all at once.
The concave friction wheel type continuously variable transmission mechanism according to claim 1, wherein the concave friction wheel type continuously variable transmission mechanism is connected to the second friction wheel.