KR101498923B1 - Multi stage gear type transmission - Google Patents

Abstract

An invention for a multi-speed gear transmission is disclosed. The disclosed invention includes: a central shaft portion; An input part rotatably installed on a central shaft part; An output unit rotated in conjunction with rotation of the input unit; A shift unit that receives a rotational force from an input unit and outputs a rotational force to be shifted; A two-stage shift unit that receives a rotational force from the shift unit and transmits the rotational force to the output unit; A shift shaft portion rotatably installed on the central shaft portion and adapted to adjust the shifting operation of the transmission unit by adjusting its rotational position; And a two-speed shift shaft portion provided separately from the transmission shaft portion and rotatably mounted on the central shaft portion, and the rotational position is adjusted independently of the transmission shaft portion to control the shifting operation of the two-speed transmission unit.

Description

[0001] MULTI STAGE GEAR TYPE TRANSMISSION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-speed gear transmission, and more particularly, to a multi-speed gear transmission that outputs a driven power by accelerating or decelerating a received driving force.

Generally, a transmission is a device capable of receiving a driving force and outputting a driven force, and accelerating or decelerating according to a required condition to obtain a desired rotational speed or torque. Such transmission devices are applied to various fields in various fields such as transportation means such as bicycles, automobiles, and various machines, tools, and the like throughout the industry.

Particularly, in a transmission applied to a bicycle, a type in which a plurality of sprockets are stacked and installed in a rear wheel hub and a crank, respectively, is combined with a chain, and a gear stage is selected through a derailleur.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Registration No. 10-0367198 (registered on Dec. 23, 2002, entitled "Bicycle Transmission Device").

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-speed gear transmission capable of enhancing durability and stably controlling the shifting operation.

A multi-speed gear transmission according to the present invention includes: a center shaft portion; An input part rotatably installed on the central shaft part; An output unit rotated in conjunction with rotation of the input unit; A transmission unit receiving a rotational force from the input unit and outputting a rotational force to be shifted; A two-stage shift unit that receives a rotational force from the shift unit and transmits a rotational force to the output unit; A shift shaft portion rotatably installed on the central shaft portion and having a rotational position adjusted to adjust a shifting operation of the transmission unit; And a two-speed shift shaft which is provided separately from the transmission shaft and rotatably installed on the central shaft, and whose rotational position is adjusted separately from the transmission shaft so as to control the shifting action of the two-stage shift unit.

The two-speed transmission unit includes a two-speed transmission portion that is operated in a non-shifting state for transmitting a rotational force received from a rotational force from the transmission unit to the output portion or transmitting an unshifted rotational force to the output portion, ; And a two-speed shifting portion for shifting the two-speed shifting portion in a shifting state or a non-shifting state according to a rotational position of the two-speed shifting shaft portion.

Further, the two-stage shifting portion includes: a two-speed shifting sling gear rotated in conjunction with rotation of the shifting unit; A two-stage transmission side carrier in which a plurality of two-speed-change side planet gears meshing with the two-speed transmission side gear are rotatably installed; And a planetary gear mechanism that is rotatably provided on the central shaft portion and engages with the two-stage speed change side satellite gear, and that outputs a rotational force to the output portion in association with rotation of the two- Side sun gear.

In addition, the two-stage shift control portion may include a two-stage clutch portion movably provided at a fixed position for preventing unidirectional rotation of the two-speed-change side carrier; And a two-stage clutch guiding portion interlocked with the rotation of the two-stage shift shaft portion to move the two-stage clutch portion to the fixed position.

In addition, the two-stage transmission portion may be configured such that, when the two-stage clutch portion is released from the fixed position, the two-stage speed change side carrier and the two-speed change speed side sun gear are integrally rotated with the two- Outputting an unturned rotational force; Wherein the one-way rotation of the two-step speed change side carrier is stopped by the fixed position movement of the two-stage clutch portion, and the two-speed change side satellite gear is rotated in conjunction with the rotation of the two- It is preferable that the two-speed-change-speed sun gear is rotated in conjunction with the rotation of the side gear to output a rotational force shifted to the output section.

The two-stage clutch guide portion includes a first cam pin movably coupled to the center shaft portion and being moved along the longitudinal direction of the central shaft portion in association with rotation of the two-stage speed change shaft portion; A clutch guide ring movably coupled to the two-speed-change shaft portion and moved along the longitudinal direction of the central shaft portion in association with the movement of the first cam pin; And a second cam pin for coupling the second-stage clutch portion to the clutch guide ring so that the second-stage clutch portion is moved along the longitudinal direction of the central shaft portion in association with the movement of the clutch guide ring.

A guide groove is formed in the central shaft portion so as to be concave on the outer circumferential surface of the central shaft portion and extends in a spiral shape along the outer peripheral surface of the central shaft portion to guide movement along the longitudinal direction of the central shaft portion of the first cam pin ; One side of the first cam pin is coupled to the clutch guide ring provided to surround the two-speed shift shaft portion, and the other side of the first cam pin is inserted through the two-stage shift shaft portion and movably inserted into the shift guide groove .

The clutch guide ring may be formed with a first fitting hole into which the first cam pin is fitted and a second fitting hole into which the second cam pin is fitted; Wherein the second-stage clutch portion is formed with a sliding hole formed to penetrate the second-stage clutch portion and extending along the circumferential direction of the second-stage clutch portion so that the second cam pin is movably inserted therein; And the first fitting hole is formed so that at least a portion thereof is covered by the second-stage clutch portion located at a position for opening the second fitting hole to the outside of the second-stage clutch portion through the sliding hole, Is preferably disposed at a position different from the second fitting hole.

Preferably, the sliding hole is formed to have a wider width than the cam pin so that the second-stage clutch portion can be moved along the longitudinal direction of the central shaft portion in a state where the second cam pin is inserted into the sliding hole.

It is preferable that the two-stage shift control portion further include a two-stage clutch pressing portion for elastically pressing the two-stage clutch portion toward the fixed position.

According to the multi-speed gear transmission of the present invention, since the operation control of the transmission unit and the operation control of the two-stage transmission unit are separately performed by the two transmission shaft portions, Resistance to deformation due to frictional resistance, wear and torsion is improved, durability is enhanced, and the shifting operation of the transmission unit and the two-speed transmission unit can be stably controlled.

Further, the present invention can suppress the disengagement of the second cam pin from the first fitting hole in the process of inserting the second cam pin into the second fitting hole while the assembly between the second-stage clutch guide portion and the second- Therefore, it is easy and convenient to assemble the parts in the manufacturing process.

1 is a front sectional view showing the structure of a multi-speed gear transmission according to an embodiment of the present invention.
2 is an exploded perspective view showing a multi-speed gear transmission according to an embodiment of the present invention.
3 is an exploded perspective view illustrating a portion of a transmission shaft and a direct connection portion according to an embodiment of the present invention.
4 is a side cross-sectional view showing a mounting structure of a ratchet pawl according to an embodiment of the present invention.
5 is a side cross-sectional view showing the operating state of the ratchet pawl shown in Fig.
6 is an exploded perspective view illustrating an input side transmission according to an embodiment of the present invention.
7 is an exploded perspective view illustrating an output side shifting portion according to an embodiment of the present invention.
8 is a front sectional view showing the installation structure of a direct connection part according to an embodiment of the present invention.
9 is a front sectional view showing the operation of the direct connection portion shown in FIG.
10 is an exploded perspective view showing a two-speed transmission shaft portion and a two-speed transmission unit portion according to an embodiment of the present invention.
11 is a side cross-sectional view showing the installation structure of the two-speed change control portion according to the embodiment of the present invention.
12 is a front sectional view showing an installation structure of the two-speed change control unit according to the embodiment of the present invention.
13 is a front sectional view showing the operation of the two-speed change control unit shown in Fig.
FIG. 14 is a front sectional view showing a state in which the two-speed transmission unit is rotated in the other direction according to an embodiment of the present invention.

Hereinafter, an embodiment of a multi-speed gear transmission according to the present invention will be described with reference to the accompanying drawings. For convenience of explanation, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is an exploded perspective view showing a structure of a multi-speed gear transmission according to an embodiment of the present invention, FIG. 2 is an exploded perspective view illustrating a multi-speed gear transmission according to an embodiment of the present invention, FIG. 4 is an exploded perspective view showing a portion of a transmission shaft and a direct connection portion according to an embodiment of the present invention. FIG. 4 is a side sectional view showing a mounting structure of a ratchet pawl according to an embodiment of the present invention, and Fig. 5 is a side sectional view showing an operating state of the ratchet pawl shown in Fig. 6 is an exploded perspective view illustrating an input side transmission according to an embodiment of the present invention, and FIG. 7 is an exploded perspective view illustrating an output side transmission according to an embodiment of the present invention. FIG. 8 is a front sectional view showing a direct connection part according to an embodiment of the present invention, and FIG. 9 is a front sectional view showing the operation of the direct connection part shown in FIG. 10 is an exploded perspective view showing a two-speed transmission shaft portion and a two-speed transmission unit portion according to an embodiment of the present invention, and FIG. 11 is a perspective view showing a structure of a two-speed shift control portion according to an embodiment of the present invention Fig. 12 is a front sectional view showing an installation structure of the two-speed shift control unit according to an embodiment of the present invention, FIG. 13 is a front sectional view showing the operation of the two-speed shift control unit shown in FIG. 12, 2 is a front sectional view showing a state in which the two-speed transmission unit is rotated in the other direction according to an embodiment of the present invention.

1 and 2, a multi-speed gear transmission according to an embodiment of the present invention includes a central shaft portion 100, an input portion 200, an output portion 300, a transmission unit 400, A two-speed transmission unit 500, a transmission shaft portion 600, and a two-speed transmission shaft portion 700. [

The center shaft portion 100 is installed so as not to rotate in a frame (not shown) where the multi-speed gear transmission is installed. A pawl (not shown) for receiving the ratchet pawl 10 is formed on the outer circumferential surface of the central shaft portion 100 and a pawl spring 20 (not shown) for resiliently supporting the ratchet pawl 10 is provided in the central shaft portion 100, (Not shown) for receiving the pawl spring groove (not shown).

3 and 4, a plurality of ratchet pawls 10 are provided along the longitudinal direction of the central shaft portion 100 (hereinafter referred to as "axial direction"). The ratchet pawls 10 are provided in the number corresponding to the number of the respective sun gears 414, 419, 424 and 429 to be described later and each ratchet pawl 10 is received in the pole groove of the central shaft portion 100, And is rotatably mounted on the center shaft portion 100 so as to be rotatable in a direction projecting toward the center shaft portion 100 side. Each of the ratchet pawls 10 is resiliently supported by a pawl spring 20 received in a pawl spring groove, and is urged in a direction projecting toward the corresponding sun gear 414, 419, 424, 429 side.

Each of the sun gears 414, 419, 424, and 429 is provided outside the central shaft portion 100 and the transmission shaft portion 600, and is rotatably installed around the central shaft portion 100. Each of the sun gears 414, 419, 424 and 429 is disposed at an axial position where it engages with the mating ratchet pawl 10, .

As shown in Fig. 5, each ratchet pawl 10 is rotated so as to protrude toward the mating respective corresponding sun gears 414, 419, 424, and 429. When the ratchet pawls 10 are engaged with the projections of corresponding mating sun gears 414, 419, 424 and 429, In one direction or in the other direction.

Referring to FIGS. 1 and 2, the input unit 200 is rotatably installed on the central shaft portion 100. The input unit 200 receives the rotational force, rotates, and transmits the input rotational force to the transmission unit 400. In this embodiment, the input unit 200 is illustrated as being rotated in conjunction with rotation of the sprocket 210 that is connected to a chain (not shown) and rotated by movement of the chain.

The output unit 300 is rotated in conjunction with the rotation of the input unit 200. The output unit 300 is provided in the form of a case for housing the transmission unit 400, the two-speed transmission unit 500, the transmission shaft unit 600 and the two-speed transmission shaft unit 700, Speed transmission unit 500, and is rotated.

The transmission unit 400 receives the rotational force from the input unit 200 and outputs the rotational force. The transmission unit 400 includes a plurality of transmission units 410 and 420 for shifting and outputting the rotational force received from the input unit 200. In this embodiment, the transmission unit 400 is illustrated as being of a type including the input side speed change portion 410 and the output side speed change portion 420. [

1 and 6, the input side transmission portion 410 includes a first input side ring gear 411, a first input side carrier 412, a first input side satellite gear 413, a first input side sun gear 413, A second input side carrier 417, a second input side satellite gear 418, and a second input side sun gear 419. The first input side sun gear 414, the second input side ring gear 416,

The first input side ring gear 411 is formed in a ring shape in which gear teeth are formed inside. The first input side carrier 412 is engaged with the first input side ring gear 411 so as to be rotated integrally with the first input side ring gear 411. The first input side carrier 412 is engaged with the input unit 200 and is rotated by the rotation of the input unit 200. A plurality of first input side planet gears 413 on which the gear teeth are formed are rotatably (rotatably) mounted on the first input side carrier 412 and can rotate (revolve) inside the second input side ring gear 416 . The first input side sun gear 414 is rotatably provided around the central shaft portion 100 and is meshed with a plurality of first input side satellite gears 413 with gear teeth formed outside, The state of being rotatable or being prevented from being rotated is determined.

In this embodiment, it is exemplified that the rotational force is transmitted by the one-directional rotation of the input unit 200. [ According to this, the one-directional rotation of the first input side sun gear 414 is prevented by the operation of the ratchet pawl 10.

The second input side ring gear 416 is formed on the outer side of the first input side ring gear 411 and is formed in a ring shape in which gear teeth are formed inside one side adjacent to the first input side satellite gear 413. One side of the second input side ring gear 416 meshes with the first input side satellite gear 413 and the other side of the second input side ring gear 416 is engaged with the second input side carrier 417 and is rotated integrally with the second input side carrier 417. The second input side carrier 417 is located inside the first input side ring gear 411 and the second input side ring gear 416 and is coupled with the second input side ring gear 416 to be connected to the second input side ring gear 416, . A plurality of second input side planet gears 418 on which gear teeth are formed are rotatably (rotatably) mounted on the second input side carrier 417 and can rotate (revolve) inside the first input side ring gear 411 . The second input side sun gear 419 is rotatably provided around the central axis portion 100 and is meshed with a plurality of second input side satellite gears 418 with gear teeth formed on the outside thereof, The state of being rotatable or being prevented from rotating in the other direction.

The rotational force input by the one-way rotation of the input unit 200 is transmitted to the first input side carrier 412, which is rotated integrally with the input unit 200, as described above.

At this time, when the first input sun gear 414 is in the uni-directional rotation state, the second input side ring gear 416, the first input side sun gear 413, and the first input side sun gear 414, The second input side ring gear 416 is rotated integrally with the second input side ring gear 412 so that the second input side ring gear 416 outputs the untranslated rotational force.

When the first input side sun gear 414 meshes with the ratchet pawl 10 and is prevented from rotating in one direction, the first input side sun gear 413 rotates in engagement with the first input side sun gear 414, The input side ring gear 416 is rotated in engagement with the first input side satellite gear 413 that rotates. Accordingly, the second input side ring gear 416 outputs the rotational torque that is shifted.

The second input side carrier 417 and the second input side sun gear 418 and the second input side sun gear 419 are connected to the second input side ring gear 419. In the case where the second input side sun gear 419 is rotatable in the other direction, So that the second input side carrier 417 or the second input side sun gear 419 outputs the untranslated rotational force.

When the second input side sun gear 419 is prevented from rotating in the other direction, the second input side sun gear 418 rotates in engagement with the second input side ring gear 416 while rotating the second input side ring gear 416, And the second input side carrier 417 is rotated by revolving of the second input side satellite gear 418. [ Thus, the second input side carrier 417 outputs the rotational torque that is shifted.

1 and 7, the output side speed change portion 420 includes a first output side ring gear 421, a first output side carrier 422, a first output side satellite gear 423, a first output side sun gear 423, A first output side carrier 424, a second output side ring gear 426, a second output side carrier 427, a second output side satellite gear 428 and a second output side sun gear 429.

The first output side ring gear 421 is formed in a ring shape in which gear teeth are formed inside. The first output side carrier 422 is engaged with the first output side ring gear 421 to be rotated together with the first output side ring gear 421. The first output side carrier 422 is coupled with the second input side carrier 417 through the direct connection part 430 to be described later and is rotated together with the second input side carrier 417 and the second input side ring gear 416 . A plurality of first output side planet gears 423 are provided rotatably (rotatably) on the first output side carrier 422 and can rotate (revolve) inside the second output side ring gear 426 . The first output side sun gear 424 is rotatably provided around the center portion and is meshed with a plurality of first output side satellite gears 423 with gear teeth formed on the outside thereof. The state becomes possible or the state in which the rotation in one direction is blocked.

The second output side ring gear 426 is provided on the outside of the first output side ring gear 421 and is formed in a ring shape in which gear teeth are formed inside one side adjacent to the first output side satellite gear 423. The second output side ring gear 426 is engaged with the first output side satellite gear 423 and the other side is coupled with the second output side carrier 427 and rotated together with the second output side carrier 427. The second output side carrier 427 is located inside the first output side ring gear 421 and the second output side ring gear 426 and is coupled with the second output side ring gear 426 to form the second output side ring gear 426, . A plurality of second output side planetary gears 428 are provided rotatably (rotatably) on the second output side carrier 427 and can rotate (revolve) inside the first output side ring gear 421 . The second output side sun gear 429 is rotatably provided about the central axis portion 100 and is meshed with a plurality of second output side planet gears 428 with gear teeth formed on the outside thereof, The state of being rotatable or being prevented from rotating in the other direction.

Since the shifting operation of the output side speed change portion 420 as described above is similar to the shifting operation of the input side speed change portion 410, detailed description thereof will be omitted.

Meanwhile, as shown in FIGS. 1, 3 and 8, a direct connection portion 430 is provided between the input side speed change portion 410 and the output side speed change portion 420. The direct connection portion 430 is connected to the second input side sun gear 419 of the input side speed change portion 410 and the first output side sun gear 424 of the output side speed change portion 420 according to the rotational position of the speed change shaft portion 600 Side sun gear 419 and the first output-side sun gear 424, as shown in Fig.

In the present embodiment, the direct connection portion 430 is exemplified as including the direct carrier 431, the direct-coupled clutches 433 and 434, and the direct-coupled clutch guide ring 435. [

The direct connection carrier 431 connects the second input side carrier 417 and the first output side carrier 422. The direct coupling carrier 431 is coupled to the second input side carrier 417 and the other side is coupled to the first output side carrier 422 to transmit the rotational force of the second input side carrier 417 to the first output side carrier 422 do.

The direct coupling clutches 433 and 434 are provided movably in the axial direction inside the direct carrier 431. The direct clutches 433 and 434 are provided on the side adjacent to the second input side carrier 417 and on the side adjacent to the first output side carrier 422, respectively.

The direct-coupled clutch 433 provided on the side adjacent to the second input side carrier 417 is moved in the axial direction and can be moved toward the second input side sun gear 418 side, and the second input side sun gear 418, Side sun gear 418, the second input-side sun gear 418 is engaged.

The direct-coupled clutch 434 provided on the side adjacent to the first output side carrier 422 can be moved toward the first output side sun gear 424 side along the axial direction and moved toward the first output side sun gear 424 side And is engaged with the first output side sun gear 424.

The direct coupling clutch guide rings 435 and 436 are provided on the outer side of the transmission shaft portion 600 so as to surround the transmission shaft portion 600 and are disposed between the respective direct clutches 433 and 434 to support the direct clutches 433 and 434 in the axial direction . Each of the direct coupling clutch guide rings 435 and 436 that respectively support the respective direct coupling clutches 433 and 434 is movably provided along the axial direction and moves in conjunction with the rotation of the transmission shaft portion 600 to move the direct clutches 433 and 434 Guide.

According to the present embodiment, the guide groove 110 is formed in the central shaft portion 100. The guide groove 110 is recessed in the outer circumferential surface of the central shaft portion 100, and a portion thereof is formed to be bent in the axial direction. Guide pins 437 and 438 are engaged with the respective directly-coupled clutch guide rings 435 and 436, respectively.

Each of the guide pins 437 and 438 passes through a through hole (not shown) formed to extend axially in the transmission shaft portion 600 and is movably inserted into the guide groove 110. The guide pins 437 and 438 move along the guide groove 110 while rotating along the outer peripheral surface of the central shaft portion 100 together with the transmission shaft portion 600 when the transmission shaft portion 600 rotates, In the axial direction. The direct coupling clutch guide rings 435 and 436 can be guided and guided in the axial direction by the guide pins 437 and 438.

In the present embodiment, the direct-coupled clutch guide rings 435 and 436 are illustrated as being moved in the axial direction, with the distance between them becoming narrower or further away. As shown in Fig. 8, the direct-coupled clutch guide rings 435 and 436 move in the direction in which the distance between them is narrowed to press the direct-coupled clutches 433 and 434 in the axial direction, Thereby releasing the engagement between the gears 419 and 424. The direct connection state between the second input side sun gear 419 and the first output side sun gear 424 is released.

9, when the direct coupling clutch guide rings 435 and 436 are moved in directions away from each other, the action of the elastic members 439 interposed between the direct carrier 431 and the direct clutches 433 and 434 The direct coupling clutches 433 and 434 move toward the sun gears 419 and 424, respectively, and are engaged with the respective sun gears 419 and 424, respectively. Accordingly, the second input side sun gear 419 and the first output side sun gear 424 are directly connected.

Referring to Figs. 1 to 3, the shifting operation of the transmission unit 400 as described above is controlled by the speed change shaft portion 600. Fig. The transmission portion 600 is rotatably installed on the central shaft portion 100 and its rotational position is adjusted to control the shifting operation of the transmission unit 400. [

The transmission shaft portion 600 is engaged with the operation of the ratchet pawl 10 and the operation of the direct connection portion 430. The transmission shaft portion 600 is installed so as to surround the central shaft portion 100 and a plurality of pole operation holes (not shown) are formed in the transmission shaft portion 600.

According to the present embodiment, each ratchet pawl 10 is restrained by the transmission shaft portion 600 in the transmission shaft portion 600 and accommodated in the pawl groove, and then the transmission shaft portion 600 is rotated, When the hole is located on the outer side, the restraining by the transmission shaft portion 600 is released.

Since the ratchet pawl 10 is released from the ratchet pawl 10 in such a manner that the ratchet pawl 10 is elastically supported by the pawl spring 20, the ratchet pawl 10 can be rotated so as to protrude toward the corresponding sun gears 414, 419, 424, The protruded ratchet pawl 10 engages with the projections of corresponding mating sun gears 414, 419, 424 and 429 to prevent rotation of the sun gears 414, 419, 424 and 429 in one direction or the other.

That is, the operation of the ratchet pawl 10 as described above can be adjusted by the operation of the speed change shaft portion 600 which determines whether or not the ratchet pawl 10 is restrained through the movement of the pawl operating hole. Each of the pawl actuating holes may be formed to be located at different positions along the circumferential direction of the transmission shaft portion 600 so that only a part of the ratchet pawl 10 is operated according to the rotational position of the transmission shaft portion 600. [ Thus, only a part of the ratchet pawl 10 can be operated according to the rotational position of the speed change shaft portion 600, so that only the operation of adjusting the rotational position of the speed change shaft portion 600 allows the input speed change portion 410 and the output side speed change portion 420 can be controlled.

The operation of the direct connection portion 430 may be achieved by guiding the guide pin 437 and 438 to move along the guide groove 110 by rotating the transmission shaft portion 600.

The rotational position adjustment of the transmission shaft portion 600 may be performed by the transmission shaft operating portion 610. The operation of the shift shaft operation portion 610 may be controlled by a shift wire (not shown) connected to control the rotation of the shift shaft portion 600 externally.

As an example, the transmission shaft operating portion 610 may be configured to include a take-up shaft (not shown) in which the rotational position is changed according to the degree to which the transmission wire is wound, and a plurality of gears have. The rotational force transmitted through the transmission shaft operating portion 610 is transmitted to the transmission shaft portion 600 by the transmission shaft connecting member 650 connecting between the transmission shaft operating portion 610 and the transmission shaft portion 600. Accordingly, the rotational position of the transmission shaft portion 600 can be adjusted by controlling the transmission wire externally.

Referring to FIGS. 1 and 10 to 12, the two-speed transmission unit 500 receives the rotational force from the transmission unit 400 and transmits the rotational force to the output unit 300. The two-stage transmission shaft portion 700 is separated from the transmission shaft portion 600 and installed on the central shaft portion 100 so as to be rotatable around the central shaft portion 100. The two-speed shaft portion 700 is adjusted in its rotational position separately from the speed change shaft portion 600 to control the shifting operation of the two-speed transmission unit 500. [ The specific structure and operation of the two-speed-change shaft portion 700 will be described later.

According to the present embodiment, the two-speed transmission unit 500 includes a two-speed transmission portion 510 and a two-speed shift control portion 550. [

The two-speed transmission portion 510 receives a rotational force from the transmission unit 400 and transmits the rotational force to the output portion 300. The two-speed portion 510 transmits the rotational force to the output portion 300, Lt; / RTI > This two-speed transmission portion 510 includes a two-speed transmission side gear 511, a two-speed transmission side carrier 513, a two-speed transmission side sun gear 515 and a two-speed transmission side sun gear 517 do.

The two-speed shifting gear 511 is rotated in conjunction with the rotation of the shift unit 400. [ The second output side carrier 427 and the second output side ring gear 426 are coupled to the second output side carrier 427. The second output side carrier 427 and the second output side ring gear 426 .

The two-speed transmission side carrier 513 is provided on the inner side of the two-speed transmission side sling 511. The two-speed transmission side carrier 513 is rotatably provided with a plurality of two-stage transmission side planet gears 515 which are formed with gear teeth on the outside and meshed with the inside of the two-speed transmission side-siding gear 511.

Speed transmission side sun gear 517 is rotatably provided on the central shaft portion 100 and engages with the two speed transmission side satellite gear 515. The two speed transmission side carrier 513 or the two speed transmission side satellite gear 515 And outputs a rotational force to the output section 300. [ The output section 300 is coupled with the two-speed transmission side sun gear 517 and is integrally rotated with the two-speed transmission side sun gear 517. The two-speed transmission section 510 is connected to the two- And transmits the rotational force to the output unit 300 through the rotation of the output unit 300.

Stage transmission side carrier 513 is interlocked with the rotation of the two-stage speed change side carrier 513 during the rotation of the two-speed transmission side carrier 513, the two-speed transmission side carrier 513 and the two- Stage transmission side carrier 513 is prevented from being rotated in one direction, it is engaged and rotated with the two-speed transmission side sun gear 515 that rotates on the two-speed transmission side carrier 513. [

When the two-speed transmission side sun gear 517 is rotated together with the two-speed transmission side carrier 513, the two-speed transmission portion 510 outputs the rotational force input from the transmission unit 400 in an unshifted state (300). When the two-speed transmission side satellite gear 515 rotates on the two-speed transmission side carrier 513, the two-speed transmission portion 510 shifts the rotational force input from the transmission unit 400 to a speed- (300).

Reference numeral 30 denotes a bearing for rotatably coupling the output portion 300 to the central shaft portion 100.

The two-speed change control portion 550 operates the two-speed transmission portion 510 in the shifting state or the non-shifting state according to the rotational position of the two-speed shifting shaft portion 700. [ The two-stage shift control unit 550 includes a two-stage clutch unit 560 and a two-stage clutch guide unit 570.

The two-stage clutch portion 560 is provided so as to be movable to a fixed position for preventing unidirectional rotation of the two-speed change speed side carrier 513. The two-stage clutch portion 560 is formed in a ring shape surrounding the central shaft portion 100 and the two-stage speed change shaft portion 700, and is provided movably in the axial direction.

(Not shown) of an inclined shape is formed at one end portion of the two-stage clutch portion 560 facing the two-speed transmission side carrier 513, and the two-speed clutch portion 560 is opposed to the two- The protruding jaws are formed on the side walls of the side carrier 513 so as to be opposed to the protruding jaws of the two-stage clutch portion 560. [

The two-stage clutch portion 560, which has been moved to the fixed position, is engaged with the protruding jaws of the two-speed transmission side carrier 513 formed at one end of the two-stage speed change side carrier 513, The two-stage clutch portion 560 allows the two-speed transmission side carrier 513 to rotate only in the other direction and inhibits the one-way rotation.

The second-stage clutch guide portion 570 moves the second-stage clutch portion 560 to the fixed position in association with the movement of the second-speed-change shaft portion 700. The two-stage clutch guide portion 570 includes a first cam pin 571, a clutch guide ring 573, and a second cam pin 575.

On the other hand, a movement guide groove 120 is formed in the central shaft portion 100. The movement guide groove 120 is recessed in the outer peripheral surface of the central shaft portion 100 and extends in a spiral shape along the outer peripheral surface of the central shaft portion 100 to guide the movement of the first cam pin 571 in the axial direction Thereby forming a path.

The first cam pin 571 is movably coupled to the central shaft portion 100 and is moved along the axial direction in association with the rotation of the two-stage speed change shaft portion 700. [ The clutch guide ring 573 is movably provided on the outside of the two-speed change shaft portion 700 so as to surround the two-speed change shaft portion 700, and is engaged with the first cam pin 571 in the axial direction . One side of the first cam pin 571 is coupled to the clutch guide ring 573 and the other side of the first cam pin 571 is movable through the two-speed shift shaft portion 700 to the movement guide groove 120 .

According to the present embodiment, the two-speed-change shaft portion 700 is formed in a ring shape and is installed outside the central shaft portion 100 so as to surround the outer peripheral surface of the central shaft portion 100.

A through hole (not shown) penetrates through the two-stepped shaft portion 700 and extends in the axial direction. A first cam pin 571 is inserted into the through hole. The first cam pin 571 is inserted into the through hole and is movably coupled to the two-speed change shaft portion 700 in the axial direction. The other side of the first cam pin 571 is inserted through the through- And is movably inserted into the movement guide groove 120.

In addition, a first fitting hole 573a is formed in the clutch guide ring 573. The first cam pin 571 is coupled to the clutch guide ring 573 by being engaged with the first fitting hole 573a so that the clutch guide ring 573 engaged with the first cam pin 571 is engaged with the first cam pin 571, And can be moved in the axial direction integrally with the first cam pin 571 when the cam pin 571 is moved.

As described above, the first cam pin 571 that engages the center shaft portion 100, the two-stage speed change shaft portion 700, and the clutch guide ring 573 is configured such that, when the rotational position of the two- And is moved in the axial direction by a path formed in the moving guide groove 120 while being rotated along with the moving guide groove 120 while being rotated together with the two- The clutch guide ring 573 engaged with the first cam pin 571 can be rotated integrally with the first cam pin 571 while being moved in the axial direction in conjunction with the movement of the first cam pin 571.

In addition, a sliding hole 565 is formed in the second-stage clutch portion 560. Stage clutch portion 560 so that the second cam pin 575 is inserted movably in the circumferential direction of the second-stage clutch portion 560. The sliding portion 565 is formed to penetrate through the second- And extend along the circumferential direction.

The second cam pin 575 couples the two-stage clutch portion 560 so as to move in conjunction with the movement of the two-speed shift shaft portion 700. [ According to the present embodiment, one side of the second cam pin 575 is coupled to the second-stage clutch portion 560 in such a manner that it is inserted into the sliding hole 565 so as to be movable in the circumferential direction of the second-stage clutch portion 560, And the other side of the second cam pin 575 is engaged with the clutch guide ring 573. [

The clutch guide ring 573 further includes a second fitting hole 573b. The other side of the second cam pin 575 is engaged with the second fitting hole 573b to be engaged with the clutch guide ring 573. [ Thus, the two-stage clutch portion 560 is engaged with the clutch guide ring 573 through engagement with the second cam pin 575 engaged with the clutch guide ring 573. [

The second cam pin 575 that engages the second-stage clutch portion 560 with the clutch guide ring 573 is rotated integrally with the clutch guide ring 573 when the clutch guide ring 573 is moved in the axial direction, Direction. The two-stage clutch portion 560 coupled with the second cam pin 575 can be moved in the axial direction in association with the movement of the second cam pin 575. [

In the present embodiment, the first fitting hole 573a and the second fitting hole 573b are arranged on the clutch guide ring 573 so as to be spaced apart from each other, and are arranged at different positions in the axial direction. When the second-stage clutch portion 560 is positioned at a position where the second fitting hole 573b is opened to the outside of the second-stage clutch portion 560 through the sliding hole 565, the first fitting hole 573a Is at least partially covered by another portion of the two-stage clutch portion 560 in which the sliding hole 565 is not formed.

Stage clutch portion 560 and the second-stage clutch guide portion 570 are disposed between the center shaft portion 100 and the two-stage speed change shaft portion 700, Stage clutch coupling portion 570 and the second-stage clutch guide portion 570, and assembly of the second-stage clutch guide portion 570 and the second-stage clutch portion 560 in this order.

The two-stage speed change shaft portion 700 is first assembled to the central shaft portion 100 by fitting the outside of the central shaft portion 100 and the clutch guide ring 573 is fitted to the outside of the two- And is assembled to the transmission shaft portion 700.

Then the center shaft 100 is rotated so that the moving guide groove 120 of the central shaft portion 100 and the first fitting hole 573a of the clutch guide ring 573 of the through hole of the two- And the first cam pin 571 is inserted from the outside of the clutch guide ring 573 into the first fitting hole 573a.

Such insertion of the first cam pin 571 can be achieved even when the second-stage clutch portion 560 is fitted to the outside of the clutch guide ring 573 and assembled to the clutch guide ring 573. [ In this case, the insertion of the first cam pin 571 into the first fitting hole 573a is performed by disengaging the two-stage clutch portion 560 from the sliding hole 565 or the sliding hole 565 formed in the two- (Not shown) formed so as to pass through the end portions of the first and second electrodes 560 and 560.

The first cam pin 571 inserted through the first fitting hole 573 is inserted into the movement guide groove 120 through the two-step change shaft portion 573 through the through hole, Assembly between the two-stage speed change shaft portion 700 and the two-stage clutch guide portion 570 is completed.

When assembly of the center shaft portion 100 and the two-stage speed change shaft portion 700 and the second-stage clutch guide portion 570 is completed and the second-stage clutch portion 560 is assembled outside the clutch guide ring 573 as described above, The relative position between the clutch guide ring 573 and the second-stage clutch portion 560 so that the second fitting hole 573b of the clutch guide ring 573 and the sliding hole 565 of the second-stage clutch portion 560 are connected to each other, And the second cam pin 575 is inserted from the outside of the second-stage clutch portion 560 into the second fitting hole 573b.

At this time, since the first fitting hole 573a and the second fitting hole 573b are disposed on the clutch guide ring 573 at positions different from each other in the axial direction, the second fitting hole 573b and the sliding The clutch guide ring 573 and the two-stage clutch portion (clutch) 540 are opened so that the holes 565 are connected to each other, that is, the second fitting hole 573b is opened to the outside of the two- 560 are aligned, at least part of the first fitting hole 573a is covered by the portion where the sliding hole 565 of the second-stage clutch portion 560 is not formed.

Accordingly, the first cam pin 571 inserted in the first fitting hole 573a is covered by the second-stage clutch portion 560 together with the first fitting hole 573a, so that the two-stage clutch guiding portion 570, The second cam pin 575 is inserted from the first fitting hole 573a into the second fitting hole 573b while the second cam pin 575 is inserted into the second fitting hole 573b while the assembly between the two- Can be restrained from being released to the outside.

On the other hand, the two-stage clutch portion 560 provided so as to be movable in the axial direction can be moved to the fixed position side in conjunction with the rotation of the two-stage speed change shaft portion 700 or to the side deviated from the fixed position. For example, the two-stage clutch portion 560 is moved to the fixed position when the two-speed transmission shaft portion 700 is rotated in one direction and can be released from the fixed position when the two-speed transmission shaft portion 700 is rotated in the other direction. The operation and action of the second-stage clutch portion 560 will be described below.

The two-speed transmission side gear 511 of the two-speed transmission unit 500 that receives the rotational force from the transmission unit 400 is rotated in conjunction with the rotation of the transmission unit 400 to rotate integrally with the second output side carrier 427 .

At this time, if the two-stage clutch portion 560 is disengaged from the fixed position, the two-speed transmission side carrier 513 can be rotated in one direction freely (refer to FIG. 12). The two-speed transmission side carrier 513 in this state is rotated integrally with the two-speed transmission side spur gear 511, and is transmitted to the two-speed transmission side carrier 513 via the two-speed transmission satellite gear 515, Side sun gear 517 is also rotated integrally with the two-speed transmission side-siding gear 511 together with the two-speed transmission side- Accordingly, the two-speed transmission portion 510 outputs the rotational force to the output portion 300, and transmits the rotational force input from the transmission unit 400 to the output portion 300 in the non-shifted state.

In contrast, when the two-stage clutch portion 560 is moved to the fixed position and engaged with the two-speed transmission side carrier 513, the one-way rotation of the two-speed transmission side carrier 513 is blocked (see FIG. 13 ). When the unidirectional rotation of the two-stage transmission side carrier 513 is blocked in this way, the two-speed transmission side carrier 513 is rotated on the two-speed transmission side carrier 513 in engagement with the two- do. The two-stage transmission side sun gear 517 is engaged with the two-stage transmission side satellite gear 515 and is rotated. Accordingly, the two-speed transmission portion 210 transmits the rotational force to the output portion 300 in a shifting state in which the rotational force input to the transmission portion 400 is shifted.

The shifting operation of the two-speed transmission unit 500 as described above is controlled by the two-speed shift shaft portion 700. [ The two-stage transmission shaft portion 700 is rotatably installed on the central shaft portion 100 and is rotated to adjust the speed of the two-speed transmission unit 500, more specifically, Adjust the operation.

The rotation position of the two-stage transmission shaft portion 700 may be controlled by the two-speed transmission shaft operating portion 710. The operation control of the two-speed shift shaft operating portion 710 may be performed by a shift wire (not shown) connected to control the rotation of the two-speed shift shaft portion 700 externally.

As an example, the two-speed shifting shaft actuating portion 710 includes a take-up shaft (not shown) in which the rotational position is changed according to the degree to which the speed-change wire is wound, and a plurality of gears Lt; / RTI > The rotational force transmitted through the two-speed shift shaft operating portion 710 is transmitted to the two-speed shift shaft connecting portion 750 through the two-speed shift shaft connecting portion 750, which connects the two-speed shift shaft operating portion 710 and the two- And is transmitted to the speed change shaft portion 700. Accordingly, the rotational position of the two-stage speed-change shaft portion 700 can be adjusted by an external transmission wire control.

The two-speed shift shaft operating portion 710 is provided separately from the one-stage shift shaft operating portion 610, and the operation thereof is individually controlled by the different shifting wires. Accordingly, the two-stage speed change shaft portion 700 is individually adjusted in its rotational position separately from the speed change shaft portion 600. The two-speed transmission unit 500 whose operation is controlled by the two-stage transmission shaft portion 700 is separately adjusted in its shift operation separately from the transmission unit 400. [

On the other hand, the two-stage shift control portion 550 of this embodiment may further include a second-stage clutch pressure portion 580. [ The second-stage clutch pressing portion 580 elastically presses the second-stage clutch portion 560 toward the fixed position. In this embodiment, the second-stage clutch pressing portion 580 is exemplified by a coil spring whose one side supports the other side of the second-stage clutch portion 560 and the other side that is supported by the two-speed transmission shaft connecting member 750.

In addition, the sliding hole 565 of the second-stage clutch portion 560 is formed wider than the second cam pin 575. That is, the sliding hole 565 is formed between the second cam pin 575 and the second-stage clutch portion 560 inserted in the sliding hole 565, more specifically, between the cam pin 575 and the second- 560 so as to be spaced apart from each other in the axial direction between the first cam pin 560 and the second cam pin 575.

The two-stage clutch portion 560 engaged with the second cam pin 575 through the sliding hole 565 formed as described above is configured such that when the second cam pin 575 is inserted into the sliding hole 565, So that it can be installed in a flowable manner.

In accordance with the present embodiment, the two-stage clutch portion 560 moved to the fixed position is elastically pressed toward the fixed position by the pressing portion 580 so that the protruding jaws formed on the two-stage clutch portion 560 Speed side carrier 513 and is engaged with the projecting step formed on the second-speed-

As described above, the two-stage clutch portion 560 coupled with the two-speed transmission side carrier 513 allows the two-speed transmission side carrier 513 to rotate in the other direction. As shown in Fig. 14, the two-stage clutch portion 560 is configured such that when the two-speed transmission side carrier 513 is rotated in the other direction, the two-stage clutch portion 560 and the two- As the protruding jaws formed respectively slide along the inclined surfaces formed on the meshed surfaces, they are moved in the axial direction and moved in the direction in which the gap with the engagement portion with the two-speed transmission side carrier 513 is widened. As shown in Fig. 12 Stage transmission side carrier 513 by the biasing force exerted by the urging portion 580. [0157] As shown in Fig.

The sliding hole 565 is formed to be wider than the second cam pin 575 so as to form a space between the cam pin 575 and the inner wall of the two-stage clutch portion 560 in the axial direction, Thereby providing a moving path for allowing axial flow of the same two-stage clutch portion 560. [

According to the above-described multi-speed gear transmission of this embodiment, the transmission shaft portion 600 and the two-speed transmission shaft portion 700 are provided separately from each other, and the transmission shaft portion 600 and the two- (700) are separately controlled via separate actuators (610, 710).

As described above, the multi-speed gear transmission according to the present embodiment adopts a structure in which the operation control of the transmission unit 500 and the operation control of the two-stage transmission unit 600 are separately performed by the two transmission shaft portions 600 and 700, A force such as a load, a rotational force and the like applied through the transmission 500 and the two-speed transmission unit 600 during the shifting operation is guided to be dispersed and acted on the transmission shaft portion 600 and the two-speed transmission shaft portion 700, So that only the parts of the transmission shaft portions 600 and 700 that need operation control can be operated individually.

Accordingly, the force acting on each of the transmission shaft portion 600 and the two-stage transmission shaft portion 700 can be reduced and the number of operations can be reduced, so that the transmission shaft portion 600 and the two- Which is caused by interference with each of the components, and is less deformed due to wear and torsion.

The multi-speed gear transmission of this embodiment, including the above-described transmission shaft portion 600 and the two-speed transmission shaft portion 700, has the advantages of resistance to deformation due to frictional resistance, wear and torsion due to interference with adjacent components The durability is enhanced and the shifting operation of the transmission unit 500 and the two-speed transmission unit 600 can be stably controlled.

In addition, the multi-speed gear transmission according to the present embodiment includes a step of inserting the second cam pin 575 into the second fitting hole 573b while the assembly between the second-stage clutch guide portion 570 and the second- The second cam pin 575 can be prevented from being arbitrarily disengaged from the first fitting hole 573a, thereby making it possible to assemble the parts easily and conveniently during the manufacturing process.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

10: ratchet pawl 20: pole spring
100: center shaft portion 110: guide groove
120: movement guide groove 200: input part
210: sprocket 300: output part
400: transmission unit 410: input side transmission unit
411: first input side ring gear 412: first input side carrier
413: first input side satellite gear 414: first input side sun gear
416: second input side ring gear 417: second input side carrier
418: second input side satellite gear 419: second input side sun gear
420: output side shifting portion 421: first output side ring gear
422: first output side carrier 423: first output side satellite gear
424: first output side sun gear 426: second output side ring gear
427: second output side carrier 428: second output side satellite gear
429: second output side sun gear 430: direct connection part
431: Direct connection carrier 433, 434: Direct coupling clutch
435,436: Direct coupling clutch guide ring 437, 438: Guide pin
439: elastic member 500: two-speed transmission unit
510: Two-speed shifting portion 511: Two-speed shifting gear
513: Two-speed transmission side carrier 515: Two-speed transmission side satellite gear
517: Two-speed side sun gear 550: Two-speed shift control unit
560: Two-stage clutch portion 565: Sliding hole
570: Two-stage clutch guiding portion 571: First cam pin
573: clutch guide ring 573a: first fitting hole
573b: second fitting hole 575: second cam pin
580: Two-stage clutch depressing part 600:
610: transmission shaft operating part 650: transmission shaft connecting member
700: Two-speed shifting shaft portion 710: Two-speed shifting shaft operating portion
750: Two-speed transmission shaft connecting member

Claims (10)

A central axis;
An input part rotatably installed on the central shaft part;
An output unit rotated in conjunction with rotation of the input unit;
A shift unit that receives a rotational force from the input unit and outputs a rotational force to be shifted;
A two-stage shift unit that receives a rotational force from the shift unit and transmits a rotational force to the output unit;
A shift shaft portion rotatably installed on the central shaft portion and having a rotational position adjusted to adjust a shifting operation of the transmission unit; And
A two-stage speed change shaft that is separate from the speed change shaft and is rotatably installed on the center shaft and adjusts the shifting operation of the two-speed change unit by adjusting the rotational position separately from the speed change shaft; Lt; / RTI >
In the two-stage transmission unit,
A second-speed shifting portion that is operated in a non-shifting state in which the transmission portion receives a rotational force from the transmission and transmits a rotational force to the output portion, and transmits the rotational or non-shifting rotational force to the output portion; And
A 2-speed shift control unit for operating the 2-speed shift unit in a shifting state or a non-shifting state according to a rotational position of the 2-speed shift shaft; / RTI >
Wherein the two-
A two-speed transmission side-gear gear rotated in conjunction with rotation of the transmission unit;
A two-stage transmission side carrier in which a plurality of two-speed-change side planet gears meshing with the two-speed transmission side gear are rotatably installed; And
Stage transmission side planetary gear set which is rotatably provided on the central shaft portion and meshes with the two-stage speed change side satellite gear, and which outputs a rotational force to the output portion in association with the rotation of the two- Sun gear; Lt; / RTI >
Wherein the two-
A two-stage clutch portion provided movably to a fixed position for preventing unidirectional rotation of the two-speed-change side carrier; And
A two-stage clutch guiding portion interlocked with the rotation of the two-stage shift shaft portion to move the two-stage clutch portion to the fixed position; / RTI >
Wherein the second-
A first cam pin movably coupled to the central shaft portion and being moved along the longitudinal direction of the central shaft portion interlocked with the rotation of the two-stage speed change shaft portion;
A clutch guide ring movably coupled to the two-speed-change shaft portion and moved along the longitudinal direction of the central shaft portion in association with the movement of the first cam pin; And
A second cam pin coupling the second-stage clutch portion to the clutch guide ring so that the second-stage clutch portion is moved along the longitudinal direction of the central shaft portion in association with the movement of the clutch guide ring; And a speed change mechanism for changing the speed of the multi-speed gear transmission.
delete delete delete The method according to claim 1,
Wherein the two-
And when the two-stage clutch portion is disengaged from the fixed position, the two-stage speed change side carrier and the two-stage speed change side sun gear are rotated integrally with the two-speed transmission side gear to output a rotational force not shifted to the output portion;
Wherein the one-way rotation of the two-step speed change side carrier is stopped by the fixed position movement of the two-stage clutch portion, and the two-speed change side satellite gear is rotated in conjunction with the rotation of the two- Speed gear side sun gear is rotated in conjunction with the rotation of the side satellite gear to output a rotational force shifted to the output side.
delete The method according to claim 1,
A movement guide groove is formed in the central shaft portion so as to be concave on the outer circumferential surface of the central shaft portion and extend in a helical shape along the outer circumferential surface of the central shaft portion to guide movement along the longitudinal direction of the central shaft portion of the first cam pin ;
One side of the first cam pin is coupled to the clutch guide ring provided to surround the two-speed shift shaft portion, and the other side of the first cam pin is inserted into the movement guide groove through the two- Wherein the transmission mechanism is a transmission mechanism.
The method according to claim 1,
Wherein the clutch guide ring is formed with a first fitting hole into which the first cam pin is fitted and a second fitting hole into which the second cam pin is fitted;
Wherein the second-stage clutch portion is formed with a sliding hole formed to penetrate the second-stage clutch portion and extending along the circumferential direction of the second-stage clutch portion so that the second cam pin is movably inserted therein;
And the first fitting hole is formed so that at least a portion thereof is covered by the second-stage clutch portion located at a position for opening the second fitting hole to the outside of the second-stage clutch portion through the sliding hole, Is disposed at a position different from that of the second fitting hole.
9. The method of claim 8,
Wherein the sliding hole is formed to be wider than the second cam pin so that the second-stage clutch portion can be moved along the longitudinal direction of the central shaft portion in a state where the second cam pin is inserted into the sliding hole Multistage gear transmission.
10. The method of claim 9,
Wherein the two-stage shift control portion further includes a two-stage clutch pressure portion for elastically pressing the two-stage clutch portion toward the fixed position.

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