JP3278469B2 - Gear type 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 gear type continuously variable transmission.

[0002]

2. Description of the Related Art Conventionally, with regard to a continuously variable transmission of this kind which is versatile and is controlled by mechanical control means, for example, pulleys are fixed to respective shafts of an input shaft system and an output shaft system, respectively.
The belt is stretched between these pulleys to transmit the torque, and the diameter of the pulley is continuously changed by an appropriate means to realize a stepless speed change.

[0003]

However, in such a conventional method, since a slip element exists between the pulley and the belt, the work transmission rate is not high, and the slip element and the belt expand and contract. Therefore, it was difficult to accurately set the rotation speed of the output shaft.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and has a high transmission power of work and a gear type continuously variable transmission capable of accurately setting the number of revolutions of an output shaft. To solve the above problem.

[0005] As a specific means thereof, claim 1
In the above, an outer peripheral gear meshing with a gear of an input shaft rotated by an appropriate drive source is rotatably provided on the outer periphery of a cylindrical adjustment main body, and a cylindrical body rotatably penetrating this adjustment main body at its eccentric position is provided. The bearing device is rotatably supported between bearing bodies of the bearing device. The bearing device is urged toward the input shaft side and is configured to be rotatable in the urging direction. A gear is provided on the outer periphery of the output shaft that passes in the axial direction inside the body, and the output shaft is rotatably supported by the bearing device, and the length in the circumferential direction is the central angle (360 /
n) The windows corresponding to ゜ are spirally drilled in the cylindrical body one by one so as to be sequentially displaced in the circumferential direction and the axial direction, and the inner periphery of the main body is divided into n equal parts on the inner periphery of the ring-shaped main body. N divided internal gears each having a set partial tooth and having a rotatable locking arm on the outer periphery of the main body via an appropriate support are inserted into the cylindrical body, and the partial tooth is connected to the output shaft. And the support and the locking arm are rotatably fixed to the inner periphery of the outer peripheral gear by projecting from the corresponding window with a gap in the circumferential direction. A gear-type continuously variable transmission is provided.

According to a second aspect of the present invention, the support and the locking arm of the first aspect are configured as one extendable support arm, and the tip of the support arm is fixed to the inner periphery of the outer peripheral gear. The present invention provides a gear type continuously variable transmission having the same.

[0007]

[Effect] Each of the n divided internal gears inserted into the cylinder is
Each of them has partial teeth whose inner circumference is equally divided by n, and they are arranged so as to be shifted one by one in the circumferential direction and the axial direction. , A spiral inner peripheral gear is formed. On the other hand, since the gear of the output shaft is at an eccentric position with respect to the cylinder, the gear of the output shaft meshes with a part of the inner peripheral gear, that is, any one of the partial teeth of each divided internal gear. Therefore, the path through which the rotation of the input shaft is transmitted to the output shaft is the gear of the input shaft, the outer peripheral gear, the locking arm, the support, the divided internal gear, and the gear of the output shaft.

The rotation of the outer peripheral gear is transmitted to each divided internal gear via a locking arm.
Is at an eccentric position with respect to the outer peripheral gear, and since the support and the locking arm protrude from the corresponding window with a gap in the circumferential direction, the rotational speed of the outer peripheral gear and the rotational speed of the inner peripheral gear coincide with each other. However, the angular velocity differs depending on each divided internal gear. Therefore, the rotation different from the rotation of the outer peripheral gear is transmitted to the gear of the output shaft due to the difference in the angular velocity, and the speed change is realized.

In order to continuously change the speed, the eccentric angle of the eccentric position of the cylinder may be continuously changed by appropriately rotating the adjusting body. In this case, the reaction force of the outer peripheral gear due to the eccentricity of the cylindrical body is compensated by the rotational bias of the adjusting device. The approach and separation between the internal gear of each divided internal gear and the internal circumference of the external gear due to the eccentricity of the cylindrical body with the external gear due to the rotation are absorbed by the support and the locking arm.

[0010] In the above case, in the second aspect, it is absorbed by the telescopic support arm.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a cylindrical body and a bearing device in the present embodiment. It is rotatably supported by respective supports 5, 5 of ring-shaped bearing bodies 3, 4 at both ends. The support conditions of the bearing bodies 3 and 4 are basically the same on the left and right. For example, on the left side, the support body 5 is fixed across the diameter of the cylindrical bearing body 3 and is fixed. Position, that is, FIG.
As shown in the above, the inner diameter (diameter) of the bearing body 3 is represented by a:
The output shaft 1 is rotatably supported at a position where the output shaft 1 is divided into b (a <b).

Support pillars 6 and 7 are integrally provided below the bearing bodies 3 and 4, and the support pillars 6 and 7 are connected to a connecting body 8.
And the lower ends of the support columns 6 and 7 are provided so as to be rotatable with respect to an appropriate base 9. A spring member 10 is provided between the support column 7 and the base 9.
Are rotatably provided, and the support column 7, that is, the entire bearing device 2 is urged to rotate in the direction of the thick arrow in the drawing by the spring member 10. The outer circumference of both ends of the cylindrical body 11 is rotatably supported on the inner peripheral walls of the bearing bodies 3 and 4, and the entire cylindrical body 11 is rotatable between the bearing bodies 3 and 4. Therefore, the output shaft 1 is rotatable at the eccentric position in the cylindrical body 11.

On the other hand, as shown in FIGS. 1 and 2, the cylindrical body 11 has rectangular windows 12, 13, 14, 15,
16, 17, 18, and 19 are bored in the circumferential direction with a length corresponding to the central angle of 45 °. These windows 12, 13, 1
4, 15, 16, 17, 18, and 19 are sequentially shifted in the axial direction, respectively, and are bored in the cylinder 11 so as to cut the spiral for exactly one cycle. On the outer periphery of the output shaft 1 up to the windows 12 to 19 in the cylindrical body 11,
A gear 21 having a length substantially equal to the axial length L of the one cycle is fixed. A flange 22 is provided on the outer periphery of the cylindrical body 11 on the bearing body 4 side, and a flange 23 is provided at a distance from the flange 22. An adjusting body 32 of a rotation ratio adjusting device 31 as shown in FIG. 3 is rotatably provided between the flanges 22 and 23 on the outer periphery of the cylindrical body 11.

The adjusting body 32 of the adjusting device 31 has a substantially short cylindrical shape having an axial length of M, and a hole 33 having a diameter substantially equal to the outer circumference of the cylinder 11 is formed in the eccentric position in the axial direction. The main body 32 is rotatable around the outer periphery of the cylindrical body 11 by rotatably inserting the cylindrical body 11 into the hole 33. Then, one end surface of the adjustment body 32 (the flange 23
A movable member 35 is rotatably provided at one end of the bracket 34, and the lower end of the movable member 35 has a lower end with respect to the base 9. A screw body 36 rotatably supported in the same direction as above is threaded vertically. An appropriate handle 37 is provided at the upper end of the screw body 36. By rotating the handle 37, the movable member 35 moves the screw body 36 up and down, and accordingly, the main body 32 of the adjusting device 31 The eccentric angle of the hole 33 can be changed by rotating in the direction of the arrow X inside.

A cylindrical portion 42 of an outer peripheral gear 41 as shown in FIG. 4 is rotatably fitted on the outer periphery of the adjusting body 32 of the adjusting device 31. That is, the outer peripheral gear 41
On the bearing body 4 side, there is a cylindrical portion 42 of length M in which the outer periphery of the main body 32 of the adjusting device 31 is inscribed,
The adjusting body 32 of the adjusting device 31 is accommodated in the cylindrical portion 42, and the annular stopper 44 is fixed from outside by a bolt 45, a nut 46, or the like. The cylindrical portion 42 is rotatable around the outer periphery of the adjustment main body 32.

On the inner periphery of the gear portion 43 of the outer peripheral gear 41, projections 48 having small holes 47 in the axial direction are spirally displaced in the axial direction at eight equal angles (central angle 45 °). The expansion and contraction portions of the divided internal gear group shown in FIG. 5 inserted into the cylindrical body 11 are rotatably locked to these projections 48. That is, as shown in FIG. 5, divided internal gears A, B,
There are eight gears C, D, E, F, G, and H, and each of these divided internal gears has the same configuration and the same size. For details, for example, regarding the divided internal gear A, a ring-shaped main body 51
Has a partial tooth 52 obtained by dividing the circumference into eight equal parts, and further, a support member 5 is provided outside the partial tooth 52 in the main body 51.
One end of the support arm 3 is fixed, and one end of a locking arm 54 is provided on the other end of the support 53 so as to be rotatable in the circumferential direction.

Each of the divided internal gears A, B, C, D, E, F, G, and H having such a configuration is inserted one by one in the axial direction and the circumferential direction of the cylindrical body 11 while being shifted one by one. I have. For example, referring to a division in the set gear A, as shown in FIG. 6, so as to protrude the support 5 3 from the window 12 of the cylindrical body 11 is inserted a split in the set gear A to the cylindrical body 11 You. To make insertion and assembly easier,
Any conventional treatment may be used. For example, as shown
However, there is a radius around the outer edge of the ring-shaped body 51.
In addition, the corners of the support 53 are also rounded.
So that the support 53 can protrude from the window 12 without difficulty.
It is also convenient to do so. The locking arm 52 is supported
After projecting the body 53 from the window 12, the support 53
Can also be installed. But if you don't want to work,
After inserting only the main body 51 into the cylindrical body 11,
The support 53 is inserted, and the bottom of the support 53 is
Or be fixed by other suitable joining means.
Can also be. Hereinafter, similarly, other divided internal gears B,
C, D, E, F, G, H also support members 53, locking arms 5
4 corresponding by sequentially shifting so as to protrude through the window 13 to 19, it is charged into the cylinder body 11. In this case, as shown in FIG. 6, clearances with respect to the support 53 are secured at both ends in the circumferential direction of the window 12.

In this manner, each window 12 to 1 of the cylindrical body 11
The eight locking arms 54 protruding from 9 are rotatably locked to eight projections 48 provided in the outer peripheral gear 41 described above. FIG. 7 shows this state (however, the cylindrical body 11 is omitted for convenience of illustration). Then, the divided internal gears A, B, C,
A spiral inner peripheral gear formed by the D, E, F, G, and H partial teeth 52 is created. As is apparent from FIG. 7, the diameter of the spiral inner peripheral gear created in the inner periphery of the cylindrical body 11 in this manner is larger than the diameter of the gear 21 provided on the output shaft. Is eccentric to the position where the outer diameter (diameter) of the cylindrical body 11 is divided into a: b (a <b), so that a part of the inner peripheral gear and the gear 21 provided on the output shaft 1
Are set so as to mesh with each other at the point of closest approach (rear in FIG. 7: input shaft 61 side described later).

The present embodiment has the above configuration. When used, the gear 62 and the outer peripheral gear 41 provided on the outer periphery of the input shaft 61 rotated by an appropriate drive source as shown in FIG. Gear part 43 is meshed. And the input shaft 61
Is rotated to rotate the gear 62, the outer peripheral gear 41 meshed with the gear portion 43 rotates the outer periphery of the adjustment body 32 of the adjustment member 31 in the opposite direction. Then, the locking arms 54 rotatably attached to the projections 48 provided on the inner circumference of the outer peripheral gear 41 and the support 53 supporting the same also try to rotate. While it is within the clearance of each window, the rotational force cannot be transmitted to the gear 21 of the output shaft 1,
When each support member 53 comes into contact with the edge of each corresponding window, the divided internal gears A, B, C, D, E, F, G, and H are locked and fixed, and the rotational force is transmitted.

In this case, each divided internal gear A, B, C,
A spiral inner peripheral gear for one cycle is formed by the respective partial teeth 52 of D, E, F, G, and H. The inner peripheral gear thus formed is located at an eccentric position in the outer peripheral gear 41, Each of the locking arms 54 for transmitting the rotation of the outer peripheral gear 41 is rotatable and absorbs the approach and separation of the outer peripheral gear 41 with respect to the inner peripheral wall, so that the divided internal gears A, B, C, D, E ,
Each of the angular velocities F, G, and H is different at a certain point.

The inner peripheral gear and the gear 2 of the output shaft 1
1 is at a point on the input shaft 61 side where the locking arm 54 is most rotated and bent. At this time, the support 53 of each locking arm 54 is positioned at the edge of the window. Each of the divided internal gears, which are locked to the gears, transmits the rotational force to the gear 21 of the output shaft 1. Incidentally, this time is when the angular velocity is the highest.

As described above, the rotational force of the input shaft 61 is
Although transmitted to the output shaft 1, the rotation speeds r ₀ (rpm) and r ₁ (rpm) of the input shaft 61 and the output shaft 1 in this case, and their moments T ₀ (kg · m) and T ₁ ( kg · m) is as follows. That is, as shown in FIG.
When the distance from the center of the shaft to the pitch circle of the gear 62 that meshes with the outer peripheral gear 41 is l ₀ , and the distance from the center of the output shaft 1 to the pitch circle is l ₁ , r ₁ = R ₀ · l ₀ / l ₁ , and T ₁ = T ₀ · l ₁ / l ₀ .

To change the speed of the output shaft, the handle 37 of the adjusting device 31 is appropriately operated to adjust the adjusting body 32.
Is rotated to change the eccentric angle of the cylindrical body 11, the eccentricity of the inner peripheral gear formed by the divided internal gears A, B, C, D, E, F, G, and H with respect to the outer peripheral gear 41. The position can also be changed, for example, as shown in FIG. In this case, each rotation speed r ₂ (rpm) and moment T ₂ (kg · m) of the output shaft 1 change as follows. That is, assuming that the distance from the axis of the output shaft 1 to the pitch circle of the gear portion 13 of the outer peripheral gear 41 is l ₂ as shown in the figure, r ₂ = r ₀ · l ₀ / l ₂ T ₂ = That is, T ₀ · l ₂ / l ₀ . Therefore, by operating the handle 37 of the adjusting device 31, the rotation speed and moment of the output shaft 1 can be continuously and continuously changed.

As is apparent from the above embodiment, according to the present invention, since no pulley or belt to be wound around the pulley is used, there is no so-called "slip" element, and the work transfer rate is reduced. It is extremely expensive. By operating the handle 37 of the adjusting device 31 as described above, the number of revolutions of the output shaft 1 can be changed in a stepless manner, so that the desired number of revolutions can be set accurately. Therefore, for example, when used on the secondary side of a servomotor, an accurate secondary-side rotation speed can be obtained. Of course, the present invention can be applied to various types of production equipment requiring rotation control, such as rotation control of a blower.

In the above embodiment, the present invention is installed only on the output shaft 1 side. However, by installing the present invention also on the input shaft 61 side, the gear ratio can be increased synergistically.

In the above-described embodiment, the structure in which the locking arm 54 is rotatably provided with respect to the support member 53 of the divided internal gear to absorb the approach and separation from the inner periphery of the outer peripheral gear 41 is adopted. It was taken, but not limited to this
Alternatively, the divided internal gear 71 shown in FIG. This divided internal gear 71 has partial teeth 73 on the inner circumference of a ring-shaped main body 72.
And a tubular support 74 is provided outside the partial teeth 73. The support 74 is provided with an arm 75 that can slide inside the support 74 in the reciprocating arrow direction in the drawing. When the arm 75 of the divided internal gear 71 is attached to the inner peripheral wall of the outer gear 41, the distal end surface of the arm 75 may be fixed to the inner peripheral wall of the outer gear 41 via an appropriate link.

The divided internal gear having such a configuration may be configured as shown in FIG. That is, FIG.
The split internal gear 81 shown in FIG. 7 has the same configuration as the main body 82 and the partial teeth 83, except that the support body 84 has a cylindrical shape, and the arm 85 slidably inserted into the support body 84 is adapted to that. It is a square. According to this, the strength of the support body 84 and the arm 85 is improved. Therefore, the transmission can be configured to withstand high torque.

[0028]

According to the first aspect, since there is no so-called slip element in the rotation transmission system, the work transmission rate is extremely high. Also, the number of rotations of the output shaft can be set accurately.

According to the second aspect, the transmission system between the outer peripheral gear and the divided internal gear is further simplified while retaining the effect of the first aspect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bearing device according to an embodiment.

FIG. 2 is a partial sectional front view of the bearing device in the embodiment.

FIG. 3 is a perspective view of an adjusting device according to the embodiment.

FIG. 4 is a perspective view of an outer peripheral gear in the embodiment.

FIG. 5 is a perspective view of each divided internal gear in the embodiment.

FIG. 6 is a perspective view showing a state where a support and a locking arm protrude from a window of a cylindrical body in the embodiment.

FIG. 7 is a perspective view showing a state in which an outer peripheral gear and a gear of an input shaft mesh with each other in the embodiment.

FIG. 8 is an axial front explanatory view showing a relationship between an input shaft and an output shaft in the embodiment.

9 is an axial front explanatory view showing a relationship between an input shaft and an output shaft after shifting from the state of FIG. 8 in the embodiment.

FIG. 10 is a perspective view showing another example of the divided internal gear.

FIG. 11 is a perspective view showing another example of the divided internal gear.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 output shaft 2 bearing device 3 bearing body 4 bearing body 10 spring member 11 cylindrical body 12 window 13 window 14 window 15 window 16 window 17 window 18 window 18 window 19 window 21 gear 31 adjusting device 32 adjusting body 33 adjusting hole 33 outer peripheral gear 42 cylindrical portion 43 Gear part 51 Main body 52 Partial teeth 53 Support body 54 Locking arm 61 Input shaft 62 Gear A Divided internal gear B Divided internal gear C Divided internal gear D Divided internal gear E Divided internal gear F Divided internal gear G Split internal gear H Split internal gear

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-171761 (JP, A) JP-A-57-146947 (JP, A) JP-A-59-147152 (JP, A) JP-A-62-162 83532 (JP, A) JP-A-63-140147 (JP, A) JP-A-3-260439 (JP, A) JP-A-4-15340 (JP, A) JP-B-43-40657 (JP, B1) JP-B-47-24060 (JP, B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 35/00 F16H 3/42

Claims (2)

(57) [Claims] An outer peripheral gear meshing with a gear of an input shaft rotated by an appropriate drive source is rotatably provided on the outer periphery of a cylindrical adjustment main body, and penetrates the adjustment main body at an eccentric position so as to be rotatable. A cylindrical body is rotatably supported between the bearing bodies of the bearing device, and the bearing device is biased toward the input shaft side and is configured to be rotatable in the biasing direction, and is eccentric from the axis of the cylindrical body. A gear is provided on the outer periphery of the output shaft passed in the axial direction within the cylinder, and the output shaft is rotatably supported by the bearing device, and the length in the circumferential direction is equal to the central angle (36).
0 / n)}, and n windows are spirally formed in the cylindrical body so as to be shifted one by one in the circumferential direction and the axial direction, and the inner circumference of the main body in the ring shape is defined as n. N divided internal gears each having equally divided partial teeth and having a rotatable locking arm on the outer periphery of the main body via an appropriate support are inserted into the cylindrical body, and the partial teeth are It is configured to mesh with the gear of the output shaft, and the support body and the locking arm project from the corresponding window with a gap in the circumferential direction and are rotatably fixed to the inner circumference of the outer gear. A gear-type continuously variable transmission. 2. An outer peripheral gear meshing with a gear of an input shaft rotated by an appropriate drive source is rotatably provided on the outer periphery of a cylindrical adjustment main body, and penetrates the adjustment main body at an eccentric position so as to be rotatable. A cylindrical body is rotatably supported between the bearing bodies of the bearing device, and the bearing device is biased toward the input shaft side and is configured to be rotatable in the biasing direction, and is eccentric from the axis of the cylindrical body. A gear is provided on the outer periphery of the output shaft passed in the axial direction within the cylinder, and the output shaft is rotatably supported by the bearing device, and the length in the circumferential direction is equal to the central angle (36).
0 / n)}, and n windows are spirally formed in the cylindrical body so as to be shifted one by one in the circumferential direction and the axial direction, and the inner circumference of the main body in the ring shape is defined as n. N divided internal gears each having equally divided partial teeth and having an extendable support arm on the outer periphery of the main body are inserted into the cylinder, and the partial teeth mesh with the gears of the output shaft. A gear-type continuously variable transmission, wherein each of the support arms protrudes from the corresponding window with a gap in the circumferential direction, and a tip of the support arm is fixed to an inner periphery of an outer peripheral gear.