KR101475858B1 - A speed variable transmission using a roller - Google Patents

Abstract

The present invention relates to a 2-speed variable transmission using rollers and, more specifically to a 2-speed variable transmission using rollers which controls the contacts of a plurality of rollers located inside a plurality of gears and transmits power through the gears contacted with the rollers. According to the present invention, the 2-speed variable transmission using rollers includes: first and second driving gears fitted to a driving shaft rotating with power received thereto having a different gear ratio from each other; a first driven gear having a shape of a ring and receiving the rotary force from the first driving gear; a second driven gear having a shape of a ring and receiving the rotary force from the second driving gear in such a manner as to rotate at a faster speed than that in the first driven gear; first and second contact gears fitted to an output shaft in such a manner as to be spaced apart from the inner peripheral surface of the first driven gear or the second driven gear by a given distance; a plurality of first rollers contacted with the inner peripheral surface of the first driven gear and the first contact gear when the rotating speed of the first driven gear is higher than that of the first contact gear, and to transmit the rotary force of the first driven gear to the output shaft; a locking part located on the end of the output shaft; and a plurality of second rollers contacted with the inner peripheral surface of the second driven gear and the second contact gear through the locking operation of the locking part to transmit the rotary force of the second driven gear to the output shaft, wherein when the rotary force of the second driven gear having the faster rotating speed than the first driven gear is transmitted to the output shaft, the connection between the first driven gear and the output shaft is released.

Description

[0001] The present invention relates to a two-speed transmission using a roller,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a two-speed transmission using a roller, and more particularly to a two-speed transmission using a roller that controls power transmission by controlling contact of a plurality of rollers located in a plurality of gears.

Generally, a transmission used in various prime movers and transportation engines is a device for changing the rotational speed and rotational force of the output gear. Compared with a point where a maximum torque is reached at a constant speed in a general automotive internal combustion engine, a strong torque and a low rotational speed As the speed increases, the rotation speed is needed rather than the torque. Therefore, when starting by using the gear, the rotation speed is decreased and the torque is increased and the rotation speed is increased as the speed is increased do.

In the case of a general passenger car, the structure is usually configured for 3 to 6 shifts, and is composed of a metal material having high hardness for durability, and its structure is complicated.

In order to improve the fuel economy by attaching such a transmission to a small vehicle body such as a motorcycle or by reducing the weight of the vehicle body, weight reduction and volume reduction of the weight of the transmission have been emphasized.

Although a transmission having a structure similar to that of Korean Patent No. 10-0585615 " Reverse transmission for motorcycle " has been developed due to a simpler type of transmission, there is still a limit to reduce the volume due to its complicated structure. Due to its durability, its weight has also been limited.

Korean Patent No. 10-0585615 " Reverse transmission for motorcycle "

SUMMARY OF THE INVENTION It is an object of the present invention to provide a two-speed transmission having a simple structure and using a roller having a small volume.

In order to achieve the above object, a two-speed transmission using a roller according to the present invention includes a first drive gear and a second drive gear, which are located on a drive shaft that receives power and rotate and have different gear ratios, A second driven gear which is in the form of a ring that is rotated at a speed higher than that of the first driven gear by receiving a rotational force from the second driven gear, and a second driven gear A first contact gear and a second contact gear which are separated from each other by a predetermined distance from the inner circumferential surface and are coupled to the output shaft and an inner circumferential surface of the first driven gear when the rotational speed of the first driven gear is higher than a rotational speed of the first contact gear, A plurality of first rollers which contact the first gear to transmit the rotational force of the first driven gear to the output shaft, a lock portion located at the end of the output shaft, And a plurality of second rollers which contact the inner circumferential surface of the second driven gear and the second contact gear to transmit the rotational force of the second driven gear to the output shaft, When the rotational force of the driven gear is transmitted to the output shaft, the connection between the first driven gear and the output shaft is released.

The first driven gear may further include a plurality of first grooves formed on an inner circumferential surface of the first driven gear and a plurality of second grooves formed on an outer circumferential surface of the second contact gear, And the depth of the second groove in the rotational direction side is shallower than the depth in the opposite direction of rotation.

The first roller is sandwiched between the first driven gear and the first contact gear when the first roller is located at a shallow position of the first groove, so that the rotational force of the first driven gear is transmitted to the output shaft.

The second roller is sandwiched between the second driven gear and the second contact gear when the second roller is located at a shallow position of the second groove, so that the rotational force of the second driven gear is transmitted to the output shaft.

The lock portion may include a pressing portion inserted axially into an end portion of the output shaft where the second driven gear is located, a ball protruding in the direction of the outer circumference of the output shaft according to a depth of the pressing portion, And a second roller guide for rotating the second roller to change the position of the second roller.

The second elastic member may further include a second elastic member between the second contact gear and the second roller guide, wherein the second elastic guide rotates the second roller guide in a direction opposite to the direction in which the second roller guide is rotated along the protrusion of the ball .

As described above, the two-speed transmission using the roller according to the present invention has a simple structure, high durability through the roller, and reduced volume.

1 is a plan view showing a two-speed transmission using a roller according to the present invention.
2 is a perspective view showing a two-speed transmission using a roller according to the present invention.
3 is a front view showing a first driven gear and its interior in a two-stage transmission using a roller according to the present invention.
4 is a front view showing a first driven gear of a two-speed transmission using a roller according to the present invention.
5 is a view showing the operation of the first driven gear of the two-speed transmission using the roller according to the present invention.
6 or 7 is a front view showing a second driven gear of a two-speed transmission using a roller according to the present invention.
8 is a view showing the operation inside the second driven gear of the two-speed transmission using the roller according to the present invention.
9 to 14 are diagrams showing a locking portion of a two-speed transmission using a roller according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a perspective view illustrating a two-speed transmission using a roller according to an embodiment of the present invention. FIG. 3 is a perspective view of a two-stage transmission using a roller according to an embodiment of the present invention. 4 is a front view showing a first driven gear of a two-speed transmission using a roller according to the present invention, and Fig. 5 is a front view showing a first driven gear of a 2 < rd > 6 or 7 is a front view showing a second driven gear of a two-speed transmission using a roller according to the present invention, and Fig. 8 is a front view of the second driven gear according to the present invention FIGS. 9 to 14 are diagrams showing a locking part of a two-speed transmission using a roller according to the present invention. FIG.

1 or 2 shows a two-speed transmission 1 using a roller according to the present invention and a power shaft 2 to which a rotational force is transmitted from a power means such as a motor or an engine.

The two-speed transmission 1 using the roller according to the present invention includes a drive shaft 10 that is rotated by receiving a rotational force from the power shaft 2, a drive shaft 10 coupled to the drive shaft 10, A first driving gear 11 and a second driving gear 12 that rotate and a ring-shaped first driven gear 21 that receives rotational force from the first driving gear 11; An output shaft 20 for outputting a rotational force transmitted by any one of the first driven gear 21 and the second driven gear 22; And a lock unit 30 for transmitting the rotational force of the driven gear 22 to the output shaft 20.

More specifically, the rotational force transmitted to the driving shaft 10 is transmitted to the first driven gear 21 through the first driving gear 11 to rotate the output shaft 20, and the locking portion 30 The first driven gear 21 and the output shaft 20 are disconnected from each other when the second driven gear 22 is connected to the output shaft 20 by the operation of the first driven gear 21 The rotational force transmitted to the output shaft 10 is transmitted to the output shaft 20 by the second driven gear 22.

The first driven gear 21 is connected to the output shaft 20 and the second driven gear 22 is driven in accordance with the operation of the lock portion 30. In this case, (To transmit rotational force) to the output shaft 20.

Further, when the second driven gear 22 is connected to the output shaft 20, the connection between the first driven gear 21 and the output shaft 20 is released (to be described in detail below)

Since the first drive gear 11 and the second drive gear 12 are coupled to the same drive shaft 10, the first driven gear 21 and the second driven gear 22 are connected to the output shaft 20).

3 to 5 show the first driven gear 21 and the operation thereof in the two-speed transmission using the roller according to the present invention.

As described above, when the first driven gear 21 and the output shaft 20 of the two-stage transmission using the roller according to the present invention are rotated for the first time (power is started to be transmitted in the stopped state) The first driven gear 21 and the output shaft 20 are connected by the first roller 41 as shown in Fig.

For example, when power is transmitted by the power shaft in the stopped state and the drive shaft is rotated, the first drive gear 11 coupled to the drive shaft is rotated, and the first drive gear 11 The engaged first driven gear 21 is rotated.

When the first driven gear 21 receives the power, the first driven gear 21 has a rotational speed higher than that of the output shaft 20 in a stopped state. When the first driven roller 21 is driven by the first driven gear 21 And the first contact gear 51 so that the rotational force of the first driven gear 21 is transmitted to the output shaft 20.

The above-described sequence of steps is performed through the following structure.

1. Connection of first driven gear to output shaft

The first driven gear 21 having a ring shape has a plurality of first rollers 41 located along the inner circumferential surface thereof and a first contact gear 51 located at the center thereof.

A plurality of first grooves 43 are formed on the inner circumferential surface of the first driven gear 21 and the depth 43a of one side of the first grooves 43 is formed deeper than the depth 43b of the other side .

More specifically, as shown in FIG. 4, a plurality of first grooves 43 formed on the inner circumferential surface of the first driven gear 21 has a deep one side like 43a and a shallow other side like 43b.

5A, a plurality of first rollers 41 are positioned so as to correspond one by one to a plurality of first grooves 43 formed on the inner peripheral surface of the first driven gear 21, and 21a When the first driven gear 21 rotates in the same direction as the first roller 41, the first roller 41 is located at a shallow position of the first groove 43.

This is because a plurality of unfixed first rollers 41 are moved by inertia or contact with the inner circumferential surface of the first driven gear 21 and one of the first rollers 41 Is moved.

That is, the plurality of first rollers 41 corresponding to the plurality of first grooves 43 are moved only within the corresponding first grooves 43, respectively.

When the plurality of first rollers 41 are located at shallow positions in the plurality of first grooves 43 as described above, the space between the first driven gear 21 and the first contact gear 51 is narrow A plurality of first rollers 41 are fitted (fitted) between the first driven gear 21 and the first contact gear 51.

When the plurality of first rollers 41 are brought into close contact with the first driven gear 21 and the first contact gear 51, the rotational force of the first driven gear 21, The first contact gear 51 is rotated as shown by 51a and the output shaft 20 is rotated by the rotation of the first contact gear 51 coupled to the output shaft 20 .

However, when the rotational speed of the first driven gear 21, which has received the power, is not higher than the rotational speed of the output shaft 20, The first driven gear 41 is brought into close contact with the first driven gear 21 and the first contact gear 51 so that the rotational force of the first driven gear 21 is transmitted to the output shaft 20.

That is, when the rotational speed of the first driven gear 21 is faster than the rotational speed of the output shaft 20, the first driven gear 21 and the output shaft 21 are always driven by the first roller 41, 20 are connected to transmit the rotational force of the first driven gear 21 to the output shaft 20.

2. Disengagement of first driven gear and output shaft

Also, unlike the above description, when the first driven gear 21 is slower than the rotation speed of the output shaft 20, the first driven gear 21 and the output shaft 20 are disconnected from each other.

More specifically, when the rotational speed 21b of the first driven gear 21 is slower than the rotational speed 51b of the first contact gear 51 as shown in FIG. 5 (B) The first roller 41 positioned to correspond to each of the plurality of first grooves 43 formed on the inner peripheral surface of the gear 21 is located at a deep position of the first groove 43.

This is because a plurality of unfixed first rollers 41 are pushed deep into the first groove 43 by contact with the first contact gear 51 rotating at a high speed, 1 contact gears 51, as shown in Fig.

That is, the plurality of first rollers 41 are not brought into close contact with (caught in) the shallow portions of the first grooves 43 by the first contact gears 51 having a rotation speed faster than that of the first driven gear 21, (Where the gap exists).

When the plurality of first rollers 41 are located deep within the plurality of first grooves 43 as described above, the space between the first driven gear 21 and the first contact gear 51 is widened The connection between the first driven gear 21 and the first contact gear 51 is released.

The plurality of first rollers 41 are positioned between the first driven gear 21 and the first contact gear 51 so that the rotational force of the first driven gear 21 is transmitted to the first contact gear 51, And the connection between the output shaft 20 and the first driven gear 21 is released.

On the other hand, as another embodiment, the first groove 43 located on the inner peripheral surface of the first driven gear 21 may be located on the outer peripheral surface of the first contact gear 51. [

When the first groove 43 is located on the outer peripheral surface of the first contact gear 51, the shallow portion of the first groove 43 is located on the side of the rotation direction 51a of the first contact gear 51, And the deep portion is located on the side of the first contact gear 51 in the direction opposite to the rotating direction 51a.

That is, the shape of the inner peripheral surface of the first driven gear 21 has the same shape as that of the inner peripheral surface of the second driven gear 2 (2) described below, and the shape of the outer peripheral surface of the first contact gear 51 is The shape of the outer peripheral surface of the second contact gear 52 will be described.

6 to 8 illustrate the operation of the second drive gear 12 and the interior thereof in the two-stage transmission using the roller according to the present invention.

As described above, the second driven gear 22 of the two-stage transmission using the roller according to the present invention is connected to the output shaft 20 by the operation of the lock portion 30, and the second driven gear 22, The connection between the first driven gear 21 and the output shaft 20 is released as the rotational speed of the output shaft 20 becomes faster than that of the first driven gear 21 when the output shaft 20 is connected to the output shaft 20. [

This is because the gear ratio is set so that the second driven gear 22 rotates faster than the first driven gear 21.

More specifically, as described above, when power is transmitted by the power shaft (2 in FIG. 1) and the driving shaft (10 of FIG. 1) is rotated, the driving shaft The second drive gear 12 coupled with the gear 11 rotates together and the second driven gear 22 engaged with the second drive gear 12 is rotated simultaneously with the first driven gear 21 do.

Since the second driven gear 22 can be connected to the output shaft 20 only by the connecting operation of the lock portion 30, the first driven gear 21 and the second driven gear 21, which are coupled to the same driving shaft 10, The driven gear 22 is rotated at the same time but the power is not transmitted from the second driven gear 22 to the output shaft 20 and only the engagement of the second driven gear 22, The rotational force of the output shaft 22 can be transmitted to the output shaft 20.

The above-described sequence of steps is performed through the following structure.

3. Connection of 2nd driven gear to output shaft

As shown in FIG. 6, the second driven gear 22 having a ring shape includes a plurality of second rollers 42 disposed along the inner circumferential surface thereof, and a second contact gear 52 disposed at the center thereof.

7, a plurality of second grooves 44 are formed on the outer circumferential surface of the second contact gear 52, and the depth of one side of the second groove 44 is greater than the depth of the other side .

More specifically, as shown in FIG. 7, the plurality of second grooves 44 formed on the outer circumferential surface of the second contact gear 52 has a deep one side like 44a and a shallow other side like 44b.

8A, the plurality of second rollers 42 are positioned so as to correspond to the plurality of second grooves 44 formed on the outer peripheral surface of the second contact gear 52, The second roller 42 is moved to a shallow position of the second groove 44 by a portion (described below).

When the plurality of second rollers 42 are located at shallow positions in the plurality of second grooves 44 as described above, the space between the second driven gear 22 and the second contact gear 52 is narrow And a plurality of second rollers 42 are closely contacted with (intermixed with) the interspace.

When the plurality of second rollers 42 come into close contact with the second driven gear 22 and the second contact gear 52, the rotational force of the second driven gear 22 is transmitted to the second contact gear 52 And the output shaft 20 is rotated by the rotation 22a of the second contact gear 52 coupled with the output shaft 20. [

4. Release of 2nd driven gear and output shaft

Further, when the second roller 42 is moved to the deep portion of the second groove 44 by the lock portion (to be described below), the second driven gear 22 and the output shaft 20 are connected to each other Is released.

More specifically, when the second roller 42 is located at a deep position in the second groove 44 by the lock portion (described below) as shown in FIG. 8B, This is because the second roller 42 is not in contact (caught) between the second driven gear 22 and the second contact gear 52 even if the second roller 22 rotates as in 22b.

That is, even if the second driven gear 22 rotates, the position of the second roller 42 is fixed to the deep portion of the second groove 44 by the lock portion, It is not possible to stick to the shallow part of the body.

As described above, in order to release the connection between the second driven gear 22 and the second contact gear 52, a predetermined position on the rotating output shaft 20 or the second contact gear 52 The second groove 42 is formed on the second contact gear 52 as the second roller 42 is to be fixed.

9 to 14 illustrate a locking portion of the two-speed transmission using the roller according to the present invention, for restricting the position of the second roller 42 described above.

1) includes a pressing portion 31 inserted at a predetermined depth at an end of the output shaft 20, a first elastic body 33 positioned at an end of the pressing portion 31, And a second roller guide 32 for fixing the position of the ball 35 and the second roller 42 to be protruded or inserted by the movement of the part 31. [

5. Locking and unlocking action

More specifically, as shown in Fig. 10, when the pressing portion 31 is pressed as shown by 31a, the ball 35 is pressed by the inclined surface formed on the pressing portion 31, And protrudes to the outside as in 35a through the hole.

14, when the ball 35 protrudes through a predetermined hole formed in the output shaft 20, the ball 32 is inserted into the rotation groove 32a formed in the inner circumferential surface of the second roller guide 32, The second roller guide 32 is rotated by a predetermined angle like the arrow 30b.

That is, the ball 35 is inserted into the rotation groove 32a of the second roller guide 32 while being projected outward through a predetermined hole formed in the output shaft 20 by the inclined surface formed in the pressing portion 31, As the ball 35 is inserted into the rotary groove 32a, the second roller guide 32 is rotated in the direction 30b by a predetermined angle.

That is, the second roller guide 32 is moved in a predetermined angle so that the ball 35 is inserted into the rotation groove 32a having a staggered shape by a predetermined angle and the ball 35 protruding into the rotation groove 32a is in contact with the rotation groove 32a. .

Accordingly, the second roller 42 inserted into the second roller guide 32 at a predetermined interval is rotated (moved) by a predetermined angle in the direction 30b, And the rotational force of the second driven gear 22 is transmitted to the second driven gear 52 by the second roller 42. The second driven gear 52 is engaged with the second driven gear 22 and the second driven gear 52, ).

As described above, when the rotational force of the second driven gear 22 is transmitted to the second contact gear 52 by the second roller 42 by the lock portion 30, the rotational force of the second driven gear 22 is transmitted to the second contact gear 52 The combined output shaft 20 is rotated.

Since the gear ratio is set so that the second driven gear 22 rotates faster than the first driven gear 21, the output shaft 20, to which the rotational force of the second driven gear 22 is transmitted, The connection between the first driven gear 21 and the output shaft 20 is released as the speed of the output shaft 20 becomes faster than the rotation speed of the first driven gear 21, do.

The rotational force of the first driven gear 21 is transmitted to the output shaft 20 before the second driven gear 22 and the output shaft 20 are connected by the lock portion 30. However, The connection between the first driven gear 21 and the output shaft 20 is released when the second driven gear 22 and the output shaft 20 are connected.

The pressing portion 31 is retracted by the first elastic body 33 by a predetermined distance and the second elastic body 34 is rotated by the second elastic body 34 in the direction of the arrow Y. As a result, (35) is inserted into the output shaft (20).

The reason why the ball 35 is inserted into the output shaft 20 as described above is due to the elastic force of the second elastic body 34 located on one surface of the second roller guide 32, A plurality of second elastic body insertion grooves 32b are formed on one surface and one second elastic body 34 is inserted into each of the second elastic body insertion grooves 32a.

The second elastic body 34 is inserted through the second elastic body insertion hole 32c penetrating from the other surface of the second roller guide 32 into the second elastic body insertion groove 32b and the second elastic body 34 Is brought into contact with the second roller guide 32 and the other end is brought into contact with the rotation projection 53 of the second contact gear 52. [

The second elastic member 34 is urged to rotate the second roller guide 32 in the direction 30a from the rotation protrusion 53 of the second contact gear 52. The second elastic member 34 The ball 35 is inserted into the output shaft 20 as the second roller guide 32 is rotated.

In addition, as the second roller guide 32 is rotated in the same direction as 30a, the connection between the second driven gear 22 and the output shaft 20 is released as shown in FIG. 8 (B).

The second elastic body 34 for rotating the second roller guide 32 in the direction 30a as described above can be elastically deformed by the urging force of the first elastic body 33, There is an effect that the ball 35 is inserted into the output shaft 20 by rotating the second roller guide 32 in the direction of 30a when a defect that the pressing force of the pressing roller 31 is not completely removed occurs.

That is, when the pushing portion 31 is not easily retracted, the second roller guide 32 is forcibly rotated in the direction of 30a by using the elastic force of the second elastic body 34 and the second driven gear 22 and the output So that the connection between the shafts 20 is released.

The depth and shallow direction of the first groove 43 and the second groove 44 and the rotational direction of the drive shaft 10 and the position of the first groove 43 and the second groove 44 The first groove 43 is located at the first driven gear and the second groove 44 is located at the second contact gear 52), the second roller guide 32, the direction in which the second roller guide 32 is rotated by the second elastic body 34, and the like may be sufficiently changed.

In another embodiment, the first groove may not be located on the inner peripheral surface of the first driven gear but may be located on the outer peripheral surface of the first contact gear.

In another embodiment, the direction in which the second roller guide 32 is rotated by the second elastic body 34 is in the same direction as 30b, and when the pressing portion 31 is pressed, the ball 35 protrudes 2 roller guide 32 in the direction of 30a.

The connection between the second driven gear 22 and the output shaft 20 can be achieved even when the second roller guide 32 rotates in the direction 30a when the pressing portion 31 is pressed. 8 (B).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention. The scope of the invention should therefore be construed in light of the claims set forth to cover many of such variations.

1: 2-speed transmission using roller
2: Power shaft
10: drive shaft
11: first drive gear
12: second drive gear
20: Output shaft
21: First driven gear
22: second driven gear
30:
31:
32: second roller guide
32a: rotating groove
32b: elastic member insertion groove
32c: Elastic body insertion hole
33: First elastic body
34: second elastic body
35: Ball
41: first roller
42: second roller
43: 1st home
44: 2nd home
51: first contact gear
52: second contact gear
53: rotation projection

Claims (6)

A first driving gear and a second driving gear which are located on a driving shaft that receives power and rotate and have different gear ratios;
A first driven gear in the form of a ring receiving rotational force from the first drive gear;
A second driven gear in the form of a ring that receives rotational force from the second drive gear and rotates at a higher speed than the first driven gear;
A first contact gear and a second contact gear spaced apart from the inner peripheral surface of the first driven gear or the second driven gear by a predetermined distance and coupled to the output shaft;
A plurality of first gears for transmitting the rotational force of the first driven gear to the output shaft in contact with the inner circumferential surface of the first driven gear and the first contact gear when the rotational speed of the first driven gear is higher than the rotational speed of the first contact gear, A roller;
A locking portion located at an end of the output shaft;
And a plurality of second rollers that contact the inner circumferential surface of the second driven gear and the second contact gear by the lock operation of the lock portion to transmit the rotational force of the second driven gear to the output shaft,
When the rotational force of the second driven gear having a rotational speed higher than that of the first driven gear is transmitted to the output shaft, the connection between the first driven gear and the output shaft is released,
The locking portion
A pressing portion axially inserted into an end portion of an output shaft where the second driven gear is located;
A ball protruding in the direction of an outer circumferential surface of the output shaft according to a depth at which the pressing portion is inserted;
And a second roller guide which is rotated at a predetermined angle in accordance with the protrusion of the ball to change the position of the second roller
2-speed transmission with roller.
The method according to claim 1,
A plurality of first grooves formed on an inner peripheral surface of the first driven gear;
Further comprising a plurality of second grooves formed on an outer circumferential surface of the second contact gear,
The depth of the first groove in the rotational direction is deeper than the depth in the opposite direction of rotation,
And the depth of the second groove in the rotation direction side is shallower than the depth in the opposite direction of rotation.
2-speed transmission with roller.
3. The method of claim 2,
And the first roller is sandwiched between the first driven gear and the first contact gear when the first roller is located at a shallow position of the first groove, so that the rotational force of the first driven gear is transmitted to the output shaft
2-speed transmission with roller.
3. The method of claim 2,
And the second roller is sandwiched between the second driven gear and the second contact gear when the second roller is located at a shallow position of the second groove, so that the rotational force of the second driven gear is transmitted to the output shaft
2-speed transmission with roller.
delete 5. The method of claim 4,
Further comprising a second elastic body between the second contact gear and the second roller guide,
And the second elastic body rotates the second roller guide in a direction opposite to a direction in which the second roller guide is rotated along with the projection of the ball
2-speed transmission with roller.

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