JP2789408B2 - Continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission used in the field of transmissions requiring a high speed reduction stepless transmission in various industries and machine tools.

[0002]

2. Description of the Related Art As a conventional speed reducer having a constant speed reduction ratio, a planetary differential speed reducer using a gear train is well known. As a continuously variable speed change device, a coaxially provided input shaft extends from an input shaft to an output shaft. 2. Description of the Related Art There is known a frictionless continuously variable transmission having a configuration using a conical trochanter on a transmission system.

[0003]

However, the above-described frictionless continuously variable transmission has a complicated shape and has difficulties in terms of manufacturing accuracy, and is relatively large and heavy in structure. was there.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a rolling bearing composed of a large number of rollers with excellent strength, stable durability, high accuracy, low frictional resistance and noise. It is an object of the present invention to provide a continuously variable transmission that is small in size, particularly compact, excellent in manufacturability and economy, capable of reversible rotation, and capable of securing a high deceleration rate.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has been made in consideration of the above circumstances.
a and an output-side tapered portion 3b are configured such that their large-diameter-side end surfaces are abutted and integrated on the same central axis so as to be axially mounted on the input shaft 1, and the input side of the tapered inner ring 3 A fixed outer ring 5 which is a ring form which concentrically surrounds the outer periphery of the tapered portion 3a and which has a tapered inner surface 5a having the same direction and the same gradient corresponding to the input side tapered portion 3a and which is fixedly connected to the housing 4.
And a ring configuration that concentrically surrounds the outer periphery of the output side tapered portion 3b of the tapered inner ring 3, and the tapered inner surface 7b having the same direction and the same gradient corresponding to the output side tapered portion 3b.
And an output outer ring 7 configured to be rotatably supported by the housing 4 and fixedly coupled to an inner surface of a cylindrical ring 6 that rotates integrally with the output shaft 2, and an input-side tapered portion 3 a
A plurality of drum-shaped input-side rollers 10a that circumscribes an outer peripheral surface of the fixed outer ring 5 and rotates and revolves by rotation of the tapered inner ring 3 and an output shaft-side taper of the tapered inner ring 3 Each of a plurality of drum-shaped output rollers 10b that circumscribes the outer peripheral surface of the portion 3b and inscribes the tapered inner surface 7b of the output outer ring 7 and that rotates and revolves by rotation of the tapered inner ring 3 is shared by a single unit. It is held in a plurality of roller holding holes 9 formed in the cylindrical wall of the cylinder, and this is fixed to the input side taper portion 3 a of the tapered inner ring 3.
And the outer peripheral surface of the output side taper portion 3b, inside the fixed outer ring 5 and the output outer ring 7, penetrating the tapered inner ring 3 in the axial direction so as to be freely adjustable.
The rotation of the input roller 10a determined by the rotation of the input shaft 1 causes the rotation of the input side roller 10a to be rotated by the common roller holding cylinder 8. The revolution of the output roller 10b is constrained in the same way as the revolution of the input roller 10a, the output outer ring 7 is rotated to allow the rotation of the rotation of the output roller 10b due to the constraint, and the rotation input from the input shaft 1 is The gist of the present invention is a continuously variable transmission that changes the speed and outputs the output from the output shaft 2.

[0006]

In order to facilitate understanding of the operation of the continuously variable transmission according to the present invention constructed as described above, the tapered inner ring 3 is used.
Assuming that the outer peripheral surfaces of the input side taper portion 3a and the output side taper portion 3b are symmetric, and the diameters of the input side roller 10a and the output side roller 10b are the same, the following will be described. That is, when the tapered inner ring 3 is rotated by the rotation of the input shaft 1, the input-side roller 10 a and the output-side roller 10 b held by the rotatable roller holding cylinder 8 become the input-side and output-side taper portions 3 a, 3 b. Rotates in a state of circumscribing the outer peripheral surface of the.

The input side roller 10a rotates while being in contact with the tapered inner surface 5a of the fixed outer race 5 fixed to the housing.
To revolve around the input side taper portion 3a. As a result, the rotatable roller holding cylinder 8 holding the input side roller 10a is the same as the revolution of the input side roller 10a. Will rotate.

On the other hand, an output-side roller 10b circumscribing the outer peripheral surface of the output-side tapered portion 3b of the input shaft 1 is internally connected to a tapered inner surface 7b of an output outer ring 7 integrally connected to the output shaft 2 and rotatably supported. Since it rotates in the contact state, it rolls on the tapered inner surface 7 b of the output outer ring 7 and revolves around the tapered inner ring 3.

In this case, the circumscribed diameter of the input side tapered portion 3a with which the input side roller 10a is in contact and the output side roller 1a
In the case where the circumscribed diameters of the output side tapered portion 3b contacted by the outer roller 0b are the same, each roller 10
The rotation of the input roller 10a determined by the rotation of the input shaft 1 causes the rotation of the input roller 10a to be maintained by the common roller holding cylinder 8 that holds the input roller 10a. The rotation of the side roller 10b is not restricted, and the output outer ring 7 does not operate.

However, when the circumscribed diameters are different from each other, the revolution of the input roller 10a determined by the rotation of the input shaft 1 causes the common roller holding cylinder 8 that holds the input roller 10a to rotate the output roller 10a. Roller 10
In order to constrain the revolution of the output roller b to be the same as the revolution of the input roller 10a, the output outer ring 7 may change the rotation of the output roller 10b so as to match the restricted number of revolutions. Activate This operation of the output outer wheel 7 causes the output shaft 2 to output.

The input side roller 10a and the output side roller 10b have input side and output side tapered portions 3a,
The setting for changing the circumscribed position of the outer peripheral surface of the housing 3b
By performing an external operation, the common roller holding cylinder 8 is moved in the axial direction to perform the operation steplessly.

By controlling this, when the diameter of the contact portion of the input side taper portion 3a circumscribed by the input side roller 10a is larger than the contact portion diameter of the output side taper portion 3b circumscribed by the output side roller 10b, the output is reduced. The rotation of the shaft 2 reduces and transmits the rotation of the input shaft 1 in the same direction, and as the diameter difference increases from small to large, the number of rotations becomes large (the deceleration rate is small). The rotation of 2 becomes zero,
If the diameter of the contact portion of the input side tapered portion 3a circumscribed by the input side roller 10a is set smaller than the diameter of the contact portion of the input side tapered portion 3b circumscribed by the output side roller 10b, the rotation of the input shaft 2 is reversed. As a result, the output shaft 2 is decelerated and transmitted.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS AND

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a continuously variable transmission according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an input shaft 1, an output shaft 2, a tapered inner ring 3, a housing 4, a fixed outer ring 5, It comprises an output outer ring 7, a roller holding cylinder 8, a movement adjustment setting means, a plurality of input-side rollers 10a and an output-side roller 10b. The configuration of these components and their mutual coupling will be described below. .

First, the input shaft 1 is rotatably supported by a radial bearing 11 and a thrust bearing 12 provided at the center of the output shaft 2 on the same axis with the output shaft 2 having the same axis. The output shaft 3 is rotatably supported by an input-side bearing 14 provided on an input-side flange 13 that closes an input-side open end of the input shaft 1. The output shaft 3 includes a radial bearing 11 at the distal end of the input shaft 1 and an output-side open end of a housing 4. An oil seal 17 that supports the input shaft 1 and the output shaft 2 in a liquid-tight manner is rotatably supported by an output-side bearing 16 provided on an output-side flange 15 that closes the input shaft 1 and the output shaft 2. And a holding cover 19 having a bearing preload bolt hole 18 are fixed.

In the tapered inner ring 3, the input-side taper portion 3a and the output-side taper portion 3b are joined together by joining their large-diameter end surfaces on the same central axis, and are symmetrical with respect to the large-diameter portion as the axis of symmetry. And is fixedly mounted on the input shaft 1 supported by the housing 4 by key means k.

The fixed outer ring 5 is a ring form which concentrically surrounds the outer periphery of the input side tapered portion 3a of the tapered inner ring 3 and has the same direction corresponding to the input side tapered portion 3a.
A tapered inner surface 5a having the same gradient is formed, and is fixed to the housing 4 by the same key means k as described above so as not to rotate.
Further, the maximum diameter of the tapered inner ring 3 and the minimum diameter of the tapered inner surface 5a of the fixed outer ring 5 are such that the common roller holding cylinder 8 can penetrate, as described later.

The output outer ring 7 is connected to the tapered inner ring 3.
Is a ring form that concentrically surrounds the outer periphery of the output side tapered portion 3b, and has a configuration in which a tapered inner surface 7b having the same direction and the same gradient corresponding to the output side tapered portion 3b is formed.
A key means k is provided on the inner surface of the cylindrical ring 6 which rotates integrally with the output shaft 2.
, And the output shaft 2 is rotatably supported by the housing 4.

The roller holding cylinder 8 holds a plurality of input-side rollers 10a and output-side rollers 10b. Each input-side roller 9 has a plurality of roller holding holes 9 formed in a common integral cylindrical cylinder wall. 10a and output side roller 1
0b, and a flange 28 provided at one end on the input side of the cylindrical portion so that the tapered inner ring 3 can be freely moved in the axial direction when the input shaft 1 is supported by the rotary slide bearing 20. It is a configuration that penetrates.

The plurality of drum-shaped input-side rollers 10a held circumscribes the outer peripheral surface of the input-side tapered portion 3a of the tapered inner ring 3, and the tapered inner surface 5a of the fixed outer ring 5
, And revolves and revolves by rotation of the tapered inner ring 3, and a plurality of drum-shaped output-side rollers 10 b
Is circumscribed on the outer peripheral surface of the output shaft side tapered portion 3b of the tapered inner race 3 and inscribed on the tapered inner surface 7b of the output outer race 7 to rotate and revolve by rotation of the tapered inner race 3. The revolution of the input roller 10b is performed by the roller holding cylinder 8 that is rotated by the revolution of the input roller 10a determined by the rotation of the input shaft 1.
The output outer ring 7 is constrained to be the same as the revolution of the output-side roller 10b so as to allow the rotation of the output-side roller 10b to be changed by the restriction.
Are rotated, and the rotation input from the input shaft 1 is shifted and output from the output shaft 2.

The movement adjustment setting means comprises a roller holding cylinder 8 supported on the input shaft 1 by a rotary slide bearing 20.
A part of the flange 28 is sandwiched by an axial sliding fork 22 fixed to a rack 21 so as not to hinder the smooth rotation of the roller holding cylinder 8, and the fork 22 is controlled by a control worm 23 and a control worm wheel 24. The rotation of the driven pinion 25 and the horizontal movement of the guide pin 26 are used to adjust the movement of the roller holding cylinder 8 in the axial direction. With this operation, the input side roller 10a is circumscribed. The circumscribed diameter position of the input side tapered portion 3a and the circumscribed diameter position of the input side tapered portion 3b to which the output side roller 10b circumscribes are changed. Reference numeral 27 denotes a position dial scale fixed coaxially with the pinion 25.

[0021]

According to the continuously variable transmission of the present invention constructed and operated as described above, when the tapered inner ring 3 is rotated by the rotation of the input shaft 1, each of the tapered portions 3a, 3a
input roller 10a and output roller 1 circumscribing b
0b is rotated, and the input side roller 10a and the tapered inner surface 7 of the output outer ring 7 are inscribed in the tapered inner surface 5a of the fixed outer ring 5.
The output-side roller 10b inscribed in b revolves around the tapered inner ring 3 while rotating, but the revolution of the input-side roller 10a determined by the rotation of the input shaft 1 is controlled by the common roller holding cylinder 8. Since the revolution of the output roller 10b is constrained to be the same as the revolution of the input roller 10a, and the output outer ring 7 rotates so as to allow the output roller 10b to change its rotation due to the constraint, each roller 10a The roller holding cylinder 8 holding the first and second rollers 10a and 10b is axially moved by the movement adjustment setting means to change and set the contact diameter of each of the rollers 10a and 10b with each of the tapered portions 3a and 3b. One rotation can be transmitted to the output shaft 2 for reduction.

The diameter of the contact portion of the input side tapered portion 3a circumscribed by the input side roller 10a is
When b is larger than the diameter of the contact portion of the circumscribed output side taper portion 3b, rotation in the same direction as the input shaft 1 is reduced and transmitted to the output shaft 2, and as the diameter difference increases from small to large, the number of rotations increases. When the diameter of both contact portions is equal, the rotation of the output shaft 2 becomes zero, and the diameter of the contact portion of the input side taper portion 3a that circumscribes the input side roller 10a is determined by the output side roller 10b.
If the diameter of the input shaft 2 is set smaller than the diameter of the contact portion of the input side tapered portion 3b, the rotation of the input shaft 2 is reversed and the output shaft 2
Can be transmitted at a reduced speed.

Since the bearing type bearing is used, the transmission efficiency is high, the strength is excellent, the accuracy is stable, the durability is high, the noise and vibration are small, and a robust and small continuously variable transmission can be obtained. At the same time, since the input and output shafts are concentric and the cross section perpendicular to the shaft has a circular structure, the balance accuracy is good, and the structure is simple, the manufacturability is good, and it can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a reduction gear transmission according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 3 Tapered inner ring 3a Input side taper 3b Output side taper 4 Housing 5 Fixed outer ring 5a Tapered inner surface 6 Tube ring 7 Output outer ring 7b Tapered inner surface 8 Roller holding cylinder 9 Holding hole 10a Input side roller 10b Output side roller 11 Radial bearing 12 Thrust bearing 13 Input side flange 14 Input side bearing 15 Output side flange 16 Output side bearing 17 Oil seal 18 Bearing preload bolt hole 19 Holding cover 20 Rotation slide bearing 21 Rack 22 Axial slide fork 23 Control worm 24 worm wheel for control 25 pinion 26 guide pin 27 position dial scale 28 flange k key means

Claims (1)

(57) [Claims] 1. An input side taper portion 3a and an output side taper.
The part 3b has its large diameter side end faces on the same central axis.
A configuration in which the shaft is attached to the input shaft 1 as an integrated form
Concentric with the tapered inner ring 3 and the outer periphery of the input side tapered portion 3a of the tapered inner ring 3
And the input side taper portion 3a
A corresponding tapered inner surface 5a having the same direction and the same gradient is formed.
Rutotomoni, a fixed outer ring 5 which is configured to be fixedly connected to the housing 4, the outer periphery of the output side tapered portion 3b of the tapered inner ring 3 the
The output side taper portion 3
The taper inner surface 7b having the same direction and the same gradient corresponding to b is formed.
And is rotatably supported by the housing 4.
Connected and fixed to the inner surface of the cylindrical ring 6 that rotates integrally with the output shaft 2
Of the fixed outer ring 5 circumscribing the output outer ring 7 and the outer peripheral surface of the input side tapered portion 3a.
The taper inner ring 3 is rotated in contact with the tapered inner surface 5a.
Multiple drum-shaped input-side rollers that rotate and revolve by rolling
-10a and the tapered portion 3b on the output shaft side of the tapered inner ring 3
And the tapered inner surface 7b of the output outer ring 7
And the rotation of the tapered inner ring 3 makes it
Each of a plurality of drum-shaped output-side rollers 10b to be rolled
Roller on a common one-piece cylindrical wall
-Hold it in the holding hole 9 and insert it into the tapered inner ring 3.
The outer peripheral surfaces of the force side taper portion 3a and the output side taper portion 3b
Around and inside the fixed outer ring 5 and the output outer ring 7
The axial movement of the tapered inner ring 3 can be adjusted and set freely.
Through the input shaft 1 so that it can rotate freely.
And an input-side roller 10a which is determined by the rotation of the input shaft 1.
Is revolved by the common roller holding cylinder 8,
The revolution of the side roller 10b is determined by the revolution of the input side roller 10a.
Output side roller 10b
Output outer ring 7 rotates to allow rotation change
Then, the rotation input from the input shaft 1 is changed in speed and output from the output shaft 2
A continuously variable transmission characterized by output .