TWI796173B - Freely shiftable gear transmission - Google Patents

Abstract

A gear box that can be shifted freely includes a base unit, a transmission unit, a speed matching unit, and multiple speed change units. The transmission unit includes two pivoting tubes that can be driven to rotate on the base unit. The pace unit includes a rotating rod rotatably arranged on the base unit, and a plurality of speed gears arranged at intervals on the rotating rod. The speed change units are arranged on the pivot tubes, and each speed change unit includes a speed change gear, and the speed change gears mesh with the speed control gears respectively. Each speed change unit can be changed between a linked state and an idle state. In the linked state, the speed change gear and the corresponding pivot tube rotate synchronously. In the idle state, the speed change gear and the corresponding pivot tube rotate synchronously. The tubes are relatively rotatable. In this way, there is no need to go through a gradual predetermined switching path when switching gear ratios, and redundant configurations with similar gear ratios can be omitted, thereby achieving the effect of fast switching and reducing space waste.

Description

Freely shiftable gear transmission

The invention relates to a transmission device, in particular to a gear box with free gear shifting.

Generally, the existing speed change device, such as the shifting device of a bicycle, has a sprocket set at the pedal place and a rear wheel respectively, and a set of chains arranged on these sprocket sets, and utilizes the mechanism to stir the chain to make it Forcibly replace the set sprocket, and adjust the rotation speed and pedaling weight by setting the sprocket combination with different gear ratios.

However, in the process of shifting speed, the existing speed change device, in terms of the pedaling power, no matter from light to heavy or from heavy to light, only one level of sprocket must be lifted or lowered at a time, and the pedal and the rear The sprocket at the wheel can only be switched one by one, that is to say, the sprocket must be switched gradually. If the slope changes frequently, the gear ratio may not be suitable for the current environment after the switch is completed, so the switch is not fast enough. The immediate question, in addition, in order to meet various pedaling needs, the sprocket set at the pedal and the sprocket set at the rear wheel will inevitably have sprocket combinations with similar gear ratios, for example, the sprocket set at the pedal has the largest number of teeth and the rear wheel The sprocket with the smallest number of teeth in the sprocket set at the pedal, and the sprocket with the largest number of teeth in the sprocket set at the rear wheel with the smallest number of teeth in the sprocket set at the pedal. The sprocket combination causes the problem of waste of assembly space.

Therefore, the object of the present invention is to provide a freely shiftable gear box that can be switched quickly and reduces space waste.

Therefore, the freely shiftable gear transmission of the present invention is suitable for a machine tool, and the freely shiftable gear transmission includes a base unit, a transmission unit, a speed matching unit, and multiple speed change units.

The base unit is arranged on the implement.

The transmission unit includes two pivoting tubes that can be driven to rotate on the base unit, one of the pivoting tubes extends along a first axis, and the other of the pivoting tubes extends along a second axis. Axis extension.

The pace unit includes a rotating rod rotatably arranged on the base unit, and a plurality of speed gears arranged at intervals on the rotating rod.

The speed change units are arranged on the pivot tubes, one of the pivot tubes is provided for at least one speed change unit, and the other is provided for a plurality of the speed change units, each speed change unit includes a speed change gear, The speed change gears mesh with the pace gears respectively. Each speed change unit can be changed between a linked state and an idle state. At the same time on each pivot tube, one of the speed change units is in the linked state, and the other speed change units are in the idle state. In the linked state, the The transmission gear rotates synchronously with the corresponding pivot tube, and in the idling state, the transmission gear and the corresponding pivot tube can rotate relatively.

The effect of the present invention is that: each speed change device can independently switch the interlocking state and the idling state, when switching the gear ratio, it is not necessary to go through a progressive and predetermined switching path, and redundant configurations with similar gear ratios can be omitted to achieve Fast switching and less space wasted.

Referring to Fig. 1, Fig. 2, Fig. 3, the embodiment of the gear box that can be shifted freely of the present invention is suitable for an implement 9, and this gear box that can be shifted freely comprises a base unit 2, a transmission unit 3 , a speed matching unit 4, and a plurality of speed changing units 5.

It should be noted that, in this embodiment, the implement 9 is a bicycle. In other embodiments, it can also be applied to other implements 9 that need to change the rotation speed of the mechanism, such as electric vehicles, etc., and is not limited thereto.

The base unit 2 is disposed on the implement 9 and includes a housing 21 and a cover 22 cooperating with the housing 21 to define a shift space 211 for the transmission units 5 to be disposed.

Referring to Fig. 3, Fig. 4 and Fig. 5, the transmission unit 3 includes two pivoting tubes 31 which can be driven and rotatably arranged on the base unit 2, and two rotating shafts which respectively pass through the pivoting tubes 31. The seat 32, the pivot tubes 31 respectively extend along a first axis L1 and a second axis L2, and the rotating seats 32 also extend respectively along the first axis L1 and the second axis L2. Each pivoting tube 31 forms an accommodating space 311 extending along its axial direction, and a plurality of through-hole groups 312 formed on the surface at intervals along its axial direction and communicating with the accommodating space 311. Each through-hole group 312 has a plurality of penetrating holes. The pivoting tube 31 communicates with the through holes 313 of the accommodating space 311 , and the through holes 313 are angularly spaced around the first axis L1 or the second axis L2 corresponding to the pivoting tube 31 . Each rotating base 32 has two grooves 321 extending axially, a mounting groove 322 for the driving elements 54 , and two opposite openings 323 communicating with the mounting grooves 322 .

The speed regulating unit 4 includes a rotating rod 41 rotatably disposed on the base unit 2 , and eight speed regulating gears 42 disposed at intervals on the rotating rod 41 . The rotating rod 41 extends along the extension direction of the first axis L1, and the speed gears 42 are arranged at intervals along the extension direction of the first axis L1.

Referring to Fig. 3, Fig. 4, Fig. 6, these speed change units 5 are arranged on these pivotal tubes 31, in more detail, eight of these speed change units 5 are included in this embodiment, and three of these speed change units 5 Set on the pivot tube 31 extending along the first axis L1, the other five shift units 5 are set on the pivot tube 31 extending along the second axis L2, each shift unit 5 includes a set of The transmission gear 51 corresponding to the pivoting tube 31, the pushing member 52 set on the corresponding rotating seat 32, the three locking members 53 movably arranged on the corresponding through hole group 312, a setting The driving member 54 in the installation groove 322, one can be driven by the driving member 54 to rotate and then drive the driving gear 55 of the pushing member 52, and the two grooves 321 arranged on the rotating base 32 and signal A limit switch 56 of the driving member 54 is connected.

In more detail, in this embodiment, the number of the speed-matching gears 42 and the speed-changing units 5 is eight. In other implementations, the speed-pacing gears 42 and the speed-changing units 5 can also be adjusted according to the number of speed-changing stages. The number of the speed change units 5 and the number of the speed change units 5 on the pivot tubes 31 are not limited thereto; The number of holes 313 is three. In other implementations, the number of through holes 313 of these clamping members 53 and each through hole group 312 can also be adjusted according to requirements, and is not limited thereto; in this embodiment, the clamps The contact member 53 is in the shape of a cylinder. In other implementations, other shapes can also be selected according to the requirements of the card contact, such as polygonal cylinders, etc., and are not limited thereto.

The speed change gears 51 respectively mesh with the speed speed gears 42 and have a polygonal hole 511 extending axially through the corresponding pivot tube 31 . The ejecting member 52 is annular and has a tooth row portion 521 engaging with the drive gear 55, three notches 522 arranged at angular intervals and recessed on the outer peripheral surface, and two notches 522 formed on the inner ring surface and respectively accommodating the gears. The limiting groove 523 of the moving part 561 and a cable management groove 524 formed on the inner ring surface and adjacent to one of the openings 323 . Each limit switch 56 has an actuating portion 561 protruding from the groove 321 and extending into the corresponding limit groove 523, each limit groove 523 has two opposite inner wall surfaces 525, and the inner wall surfaces 525 When one of them touches the actuating part 561, the limit switch 56 sends a signal to stop the driving part 54 from actuating.

It is worth mentioning that, in this embodiment, the first axis L1 is parallel to the second axis L2, and the speed change gears 51 and the pace gears 42 are spur gears. In other embodiments, they can also be Other configurations and other types of gears can be selected according to installation and transmission requirements, for example, the first axis L1 is transverse to the second axis L2, and a combination of bevel gears is used, which is not limited thereto.

Referring to Fig. 4, Fig. 6 and Fig. 7, further speaking, each speed change unit 5 can be changed between a linkage state (see Fig. 6) and an idle state (see Fig. 7), and each pivoting tube 31 has the same One of the speed change units 5 is in the linked state at a time, and the other speed change units 5 are in the idling state. In the linked state, the speed change gear 51 rotates synchronously with the corresponding pivot tube 31. In the idling state, the The transmission gear 51 and the corresponding pivot tube 31 are relatively rotatable. When it is necessary to make the speed change unit 5 into the interlocking state, the driving member 54 drives the driving gear 55 to rotate and then drives the ejecting member 52 to rotate around the rotating seat 32. At this time, the outer peripheral surface of the ejecting member 52 pushes against the The locking members 53 protrude from the respective through holes 313 and are locked against the inner peripheral surface of the transmission gear 51. When the transmission unit 5 needs to be in the idling state, the driving member 54 The pushing member 52 reversely rotates until the notches 522 correspond to the engaging members 53 , and since the notches 522 are closer to the axis, the engaging members 53 are separated from the inner peripheral surface of the transmission gear 51 .

During operation, the pivoting tube 31 extending along the first axis L1 receives power (such as pedaling of a bicycle by human power) and rotates around the first axis L1, and sequentially drives the transmission units 5 thereon , the gears 42, the shifting units 5 on the other pivoting tube 31 and the other pivoting tube 31, and the other pivoting tube 31 outputs power to other mechanisms (such as the rear wheel of a bicycle) ), and at this time, the power is transmitted by the gear ratios between the speed change units 5 and the corresponding speed gears 42 in the interlocking state. When it is necessary to operate with different gear ratios, only the different Wait for the speed change unit 5 to switch to the interlocking state, and then the rest of the speed change units 5 will be in the idling state.

Compared with the existing transmission devices, the present invention can independently switch the interlocking state and the idling state through each transmission device, and does not need to go through a gradual and predetermined switching path when switching gear ratios, and can be directly selected according to requirements during configuration. The combination of appropriate gear ratios can save redundant configurations with similar gear ratios, achieving the effect of fast switching and reducing space waste.

In summary, the freely shiftable gear box of the present invention can indeed achieve the purpose of the present invention.

But what is described above is only an embodiment of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the patent specification are still within the scope of the present invention. Within the scope covered by the patent of the present invention.

2: Base unit 21: Shell 211:Shift space 22: cover body 3: Transmission unit 31: Pivot tube 311:Accommodating space 312: Through hole group 313: through hole 32: Swivel seat 321: Groove 322: installation slot 323: opening 4: Speed unit 41:Turning rod 42: Speed gear 5: Speed change unit 51: Transmission gear 511: polygonal hole 52: Push top piece 521: gear row 522: Gap 523: limit slot 524: cable management slot 525: Inner wall surface 53: Card arrival 54: Driver 55: Drive gear 56:Limit switch 561: actuation part 9: Machinery L1: first axis L2: second axis

Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the drawings, wherein: Fig. 1 is a perspective view illustrating an embodiment of the freely shiftable gear transmission of the present invention installed on a machine tool; Fig. 2 is a perspective view of this embodiment; Fig. 3 is a top view of this embodiment; Fig. 4 is a sectional view obtained along line IV-IV among Fig. 3; Fig. 5 is a sectional view taken along line V-V among Fig. 1; Fig. 6 is a sectional view taken along the line VI-VI in Fig. 1, illustrating a speed change unit of this embodiment in a linked state; and Fig. 7 is a sectional view similar to Fig. 6, illustrating the transmission unit in an idling state.

2: Base unit

21: shell

211:Shift space

22: cover body

3: Transmission unit

31: Pivot tube

32: Swivel seat

4: Speed unit

41:Turning rod

42: Speed gear

51: Transmission gear

511: polygonal hole

53: Card arrival

54: Driver

L1: first axis

L2: second axis

Claims (9)

A gear box with freely shiftable gears is suitable for a machine tool. The gear box with free gear shifts includes: a base unit set on the machine tool; The pivoting tube of the base unit, one of the pivoting tubes extends along a first axis, and the other of the pivoting tubes extends along a second axis; a pacer unit includes a rotatable a rotating rod arranged on the base unit, and a plurality of speed control gears arranged at intervals on the rotating rod; and a plurality of shifting units arranged on the pivot tubes, one of which provides at least one of the shifting units The other one is provided for a plurality of such speed change units, each speed change unit includes a speed change gear, a pusher that can be driven, a driving gear that can be driven to rotate, and a plurality of movably arranged on Corresponding to the pivoting tube and the blocking member that can be pushed by the ejector, the ejector is annular and has a tooth row portion that engages with the drive gear, and a plurality of angular intervals that are recessed on the outer peripheral surface The notch parts are adjacent to each other and are used to accommodate the blocking parts. The drive gear rotates and drives the tooth row part to make the ejector part rotate around the corresponding first axis or the second axis, so that The speed change unit is changed between a linked state and an idle state. In the linked state, the outer peripheral surface of the ejector pushes against the locking members protruding from the pivot tube to be stuck against the speed change gear. In the idling state, the engaging parts are located in the respective notches and spaced from the speed change gear, and the speed change gears mesh with the speed control gears respectively; each speed change unit can be changed between the interlocking state and the idling state , At the same time on each pivot tube, one of the transmission units is in the interlocking state, and the other transmission units are in the idling state. In the interlocking state, the transmission gear rotates synchronously with the corresponding pivoting tube. In the idling state At this time, the speed change gear and the corresponding pivot tube can rotate relative to each other. The freely shiftable gear box as claimed in item 1, wherein each pivot tube forms an accommodating space extending along its axial direction, and a plurality of them are formed on the surface at intervals along its axial direction and communicate with the accommodating space. The group of through holes in the space, the locking members are movably arranged in the corresponding group of through holes, the transmission gear has a polygonal hole penetrating through the axial direction of the corresponding pivot tube, in the interlocking state, the The locking member is pushed against the inner peripheral surface of the transmission gear, so that the power is transmitted to the other pivotal tube through the pivoting tube, the meshing gear, and the other transmission unit in the interlocking state. , in the idling state, the engaging members do not abut against the inner peripheral surface of the corresponding transmission gear. The freely shiftable gear box according to claim 2, wherein each group of through holes has a plurality of through holes passing through the pivot tube and communicating with the accommodating space, and the through holes surround the corresponding pivot tube The first axis or the second axis are arranged at angular intervals. The freely shiftable gear box according to claim 2, wherein the transmission unit further includes two pierced through the pivot tubes and extending along the axial direction of the corresponding pivot tubes for the corresponding Etc. The rotary seat that the ejector is sheathed, each transmission unit also includes a driving member that is arranged on the corresponding rotary seat, and the driving member drives the ejector to make the transmission unit change between the interlocking state and the idling state . The freely shiftable gear box as described in Claim 4, wherein each rotating base has two grooves extending axially, and each transmission unit also includes two grooves respectively arranged in these grooves and connected to the signal The limit switch of the driving member, each limit switch has an actuating part protruding from the groove, and the ejector also has two limit switches formed on the inner ring surface and respectively accommodate the actuating parts Each limit slot has two opposite inner wall surfaces, and when one of the inner wall surfaces touches the corresponding actuating part, the limit switch sends a signal to stop the driving part from acting. The freely shiftable gear box as described in claim 5, wherein, each rotating seat also has a mounting groove for the driving parts, and two oppositely arranged openings communicating with the mounting groove, each A ejector also has a wire management groove formed on the inner ring surface and adjacent to one of the openings. The freely shiftable gear box as claimed in claim 2, wherein the engaging members are cylindrical. A freely shiftable gear transmission as claimed in claim 1, wherein the first axis is substantially parallel to the second axis. The freely shiftable gear transmission according to claim 1, wherein the base unit includes a housing, and a cover that cooperates with the housing to define a shifting space for the transmission units .

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