TW202200445A - Stepless speed change device applicable to bicycle including a frame, and a power input shaft, an eccentric cam part, a slide base, a speed change mechanism and a control part connected with the frame - Google Patents

Abstract

The present invention includes a frame, and a power input shaft, an eccentric cam part, a slide base, a speed change mechanism and a control part connected with the frame. The frame is provided with a plurality of control rods and a plurality of working gears. The slide base is provided with a plurality of corresponding swing rods and spherical rollers. The power input shaft drives the eccentric cam part to rotate one cycle, which will allow each swing rod to reciprocate at a working angle so that the corresponding working gear is driven to drive the speed change mechanism in a single direction to output power. In addition, when the control part controls the plurality of control rods to rotate synchronously, the plurality of slide bases can be driven to move relative to the corresponding control rods to change the contact position between the spherical roller and the eccentric cam part, so that the size of the working angle can be changed steplessly resulting in stepless speed change. The present invention achieves both advantages of stepless speed change of bicycles and stepless speed change more suitable for different riding needs.

Description

Continuously variable transmission for bicycles

The present invention relates to a stepless speed change device applied to a bicycle, in particular to a stepless speed change device applied to a bicycle which can achieve the stepless speed change of the bicycle, and the stepless speed change is more suitable for different riding requirements.

Conventional transmissions are widely used in various industrial fields, from vehicles to industrial machinery. In the application of bicycles, in addition to the function of transmitting power, the main purpose of the speed change mechanism is to adjust its speed ratio in a timely manner according to road conditions and driving needs to meet the requirements of the rider. There are two types of bicycle shifting mechanisms on the market: [1] External derailleur for a chain shifter. The chain shifting device has the advantages of simple shifting control, easy manufacture, and low cost. However, since the shifting mechanism components are directly exposed to the outside, the shifting mechanism is more susceptible to pollution and corrosion from the external environment, resulting in unsmooth operation. [2] Internal derailleur mounted on the rear hub. The entire speed change mechanism of the internal transmission is installed in a casing, so the sealing and lubrication are good, and its speed change accuracy is not easily affected by the external environment. more difficult to manufacture. However, whether it is a chain-shift external derailleur or a rear hub inner derailleur, these two types are all step-variable speed change mechanisms, and there is a lack of stepless speed change mechanisms for bicycles on the market. Therefore, it is necessary to develop new technologies to solve the above shortcomings.

The purpose of the present invention is to provide a stepless speed change device applied to a bicycle, which has the advantages of achieving the stepless speed change of the bicycle, and the stepless speed change is more suitable for different riding needs. In particular, the problem to be solved by the present invention lies in the external transmission of the known chain shifting device. Since the components of the transmission mechanism are directly exposed to the outside, the transmission mechanism is more susceptible to pollution and corrosion from the external environment, resulting in unsmooth operation. The internal transmission is more difficult to design and manufacture because of its compact structure, small volume, and more precise shifting action requirements. The point is that the first two types are all variable speed mechanisms, and there is a lack of stepless speed change mechanisms for bicycles on the market. The technical means to solve the above problems is to provide a stepless speed change device applied to a bicycle, which includes: A frame with a pair of first holes, a plurality of pairs of second holes and a plurality of pairs of third holes; a plurality of control rods are arranged between the plurality of pairs of second holes; a plurality of polygon outputs are arranged between the plurality of pairs of third holes rod; each polygonal output rod has an extension end on which a one-way clutch and a working gear are arranged; the one-way clutch is set between the extension end of the polygonal output rod and the working gear ; a power input shaft having a central part and two ends, and the power input shaft has a rotation axis; the central part is pivoted on the pair of first holes; an eccentric cam part with a conical outer surface and a virtual axis, the eccentric cam part is eccentrically arranged in the center part; the virtual axis is parallel to the rotation axis and separated by an eccentric distance; Plural sliding seats, each sliding seat has a control hole, a sliding hole, a swing rod, a spherical roller and an elastic element; the plurality of control holes are connected with the corresponding plurality of control rods, and each control When the rod is rotated, it can control the corresponding sliding seat to move on the axis of rotation, the sliding hole is for the corresponding polygonal output rod to pass through, and can slide relatively; the swing rod has a polygonal sliding seat And a pivoting seat, the polygon sliding seat is connected to the corresponding polygon output rod, and is a relatively slidable, non-rotatable structure; the elastic element is pulled to keep the corresponding spherical rollers in contact with the outer surface of the cone; a speed change mechanism having a speed change input part, a speed change part and a speed change output part, the speed change input part is engaged with the plurality of working gears; a control part connected to control the synchronous rotation of the plurality of control rods; Thereby, when power is input to either end, the power input shaft is forced to rotate, because the eccentric cam is eccentrically arranged, so that when the eccentric cam rotates once, each swinging rod will produce a reciprocating swing , its swing range is defined as a working angle, the swing lever synchronously drives the corresponding working gear to rotate the working angle in one direction, the plurality of working gears pass through the speed change input part and the speed change part, and the speed change output part output power; And when the control part controls the plurality of control rods to rotate synchronously, the plurality of sliding seats and the corresponding control rods move relative to each other, thereby changing the contact position between the spherical roller and the outer surface of the cone, and can continuously change the The size of the working angle can produce stepless speed changers. The above objects and advantages of the present invention can be easily understood from the detailed description and accompanying drawings of the following selected embodiments. Hereinafter, the present invention will be described in detail with the following examples and accompanying drawings:

Referring to Figures 1, 2A, 2B, 3A, 3B, 4, 5A and 5B, the present invention is a stepless speed change device applied to a bicycle, which includes: A frame 10 has a pair of first holes 11 , a plurality of pairs of second holes 12 and a plurality of pairs of third holes 13 . A plurality of control rods 121 are provided between the plurality of pairs of second holes 12 ; a plurality of polygonal output rods 131 are provided between the plurality of pairs of third holes 13 ; each polygonal output rod 131 has an extension end 13A, which There is a one-way clutch 13B and a working gear 13C. The one-way clutch 13B is disposed between the extension end 13A of the polygonal output rod 131 and the working gear 13C. A power input shaft 20 has a central portion 21 and two end portions 22 , and the power input shaft 20 has a rotation axis X; the central portion 21 is pivoted on the pair of first holes 11 . An eccentric cam portion 30 has a conical outer surface 31 and an imaginary axis line 32, the eccentric cam portion 30 is eccentrically disposed on the central portion 21; the imaginary axis line 32 is connected to the rotation axis line X parallel and separated by an eccentricity D. A plurality of sliding seats 40, each sliding seat 40 has a control hole 41, a sliding hole 42, a swing rod 43, a spherical roller 44 and an elastic element 45 (to avoid the disorder of the drawing, please refer to Fig. 6A ). The plurality of control holes 41 are connected to the corresponding plurality of control rods 121 , and each control rod 121 can control the corresponding sliding seat 40 to move on the rotation axis X when each control rod 121 is rotated. The sliding hole 42 allows the corresponding polygonal output rod 131 to pass through and can slide relatively. The swing rod 43 has a polygonal sliding seat 431 and a pivoting seat 432 . The polygonal sliding seat 431 is connected to the corresponding polygonal output rod 131 , and is a structure capable of relative sliding but not relatively rotating. The elastic element 45 is pulled to keep the corresponding spherical roller 44 in contact with the outer surface 31 of the cone. A speed change mechanism 50 has a speed change input part 51 , a speed change part 52 and a speed change output part 53 . The shift input portion 51 meshes with the plurality of working gears 13C. a control part 60 connected to control the plurality of control rods 121 to rotate synchronously; Thereby, when power is input to the either end portion 22 , the power input shaft 20 is forced to rotate, because the eccentric cam portion 30 is eccentrically arranged, so that when the eccentric cam portion 30 rotates once, each swinging rod 43 is A reciprocating swing is generated, and the swing range is defined as a working angle θ (refer to FIG. 6B ). The swing lever 43 synchronously drives the corresponding working gear 13C to rotate the working angle θ in one direction. After the plurality of working gears 13C pass through the speed change input portion 51 and the speed change portion 52 , the power is outputted through the speed change output portion 53 (eg, a sprocket, which can be connected to a chain). And when the control part 60 controls the plurality of control rods 121 to rotate synchronously, the plurality of sliding seats 40 move relative to the corresponding control rods 121, thereby changing the contact position of the ball-shaped roller 44 and the outer surface of the cone 31, and The size of the working angle θ can be changed steplessly, and a stepless speed changer can be produced. In practice, each control rod 121 can be a screw. Each control hole 41 corresponds to the screw and is a screw hole. Thereby, when each control rod 121 is rotated, the corresponding sliding seat 40 can be controlled to move relative to the control rod 121 along the rotation axis X. Each polygonal output rod 131 and the polygonal sliding seat 431 (as shown in FIG. 3B ) have corresponding structures, such as hexagonal cross-section, polygonal cross-section or convex-fitting groove, as long as the Each of the polygonal output rods 131 and the polygonal sliding seat 431 can be slidable relative to each other but cannot be rotated relative to each other. The shift input portion 51 may be a gear structure. The speed change portion 52 at least includes a sun gear 521 , a plurality of planetary gears 522 , a ring gear 523 and a planetary gear carrier 524 . Of course, the shifting portion 52 can also be modified to other types of shifting mechanisms. Thereby, the plurality of working gears 13C drive the speed change input portion 51, and the speed change input portion 51 drives the planetary gear carrier 524. At this time, the ring gear 523 does not move, the planetary gear carrier 524 drives the plurality of planetary gears 522 to rotate, and the plurality of planetary gears 522 rotate. The planetary gear 522 drives the sun gear 521 to rotate, and the sun gear 521 outputs power through the speed change output part 53 . The control unit 60 includes: a central control unit 61; The plurality of driving motors 62 are provided corresponding to the plurality of control rods 121 , and the central control unit 61 is connected to and controls the rotation amount of the plurality of control rods 121 through the plurality of driving motors 62 . Regarding the embodiment of the present case, the plurality of control rods 121 and the plurality of sliding seats 40 in the related drawings are taken as an example of 3 groups. In fact, the number is not limited, and may also be 4 groups, 5 groups, 6 groups or more. a. Theoretically, the more groups, the higher the degree of power overlap, and the smoother the overall power output. A computer simulation is performed using 4 joysticks 121 and 4 slides 40 . The theoretical speed ratio of this design example is about 1:1.2 to 1:4.2. When the four control rods 121 and the four sliding seats 40 are located at the large cone position P1 (refer to Fig. 5, the diameter of the cross-section is larger), the change range of the speed is about 350% (as shown in the first part of Fig. 7). A curve L1, a second curve L2, a third curve L3 and a fourth curve L4), in actual application, the peak speed fluctuation will be flattened due to inertia, which is estimated to be about 250%~300%. And when the four control rods 121 and the four slides 40 move to a small cone position P2 (the diameter of the cross section is small), the range of the speed change is changed to about 50% (as shown in the first part of Fig. 7). Five curves L5, a sixth curve L6, a seventh curve L7 and an eighth curve L8 are shown). The number of teeth of each working gear 13C, the sun gear 521, each planetary gear 522, the ring gear 523 and the speed change input portion 51 can be the following application examples: The number of teeth of the working gear 13C can be 36 teeth (because the rotation angle of the polygonal output rod 131 is about 40 degrees, in practice, the working gear 13C can be a 60-degree bevel shape corresponding to the speed change input portion 51, and its outer diameter and will not go beyond the shell.). The number of teeth of the sun gear 521 may be 15 teeth. The number of teeth of each planetary gear 522 may be 21 teeth. The number of teeth of the ring gear 523 may be 18 teeth. The number of teeth of the speed change input portion 51 may be 57 teeth. The output result is shown in Figure 7, from which it can be seen that the power overlaps. Because the one-way clutch 13B is provided, the final output is only one-way rotation, which proves the high feasibility of this case. The advantages and effects of the present invention are summarized as follows: [1] It can achieve the stepless speed change of the bicycle. The frame designed by the present invention (including at least a control rod, a polygonal input rod, a one-way clutch and a working gear), a power input shaft, an eccentric cam portion, a sliding seat, a speed change mechanism and a control portion. It can achieve the stepless speed change of the bicycle. Therefore, a stepless speed change of the bicycle can be achieved. [2] The stepless speed change is more suitable for different riding needs. The present invention can be applied to the stepless speed change control of bicycles. The control part controls the plurality of control rods to rotate synchronously, so that the plurality of sliding seats and the corresponding control rods can move relatively along the axis of rotation, thereby changing the contact position between the spherical roller and the outer surface of the cone, which can be changed steplessly The size of the working angle can produce stepless speed change. It allows different riders to freely adjust according to different riding states. Therefore, the stepless speed change is more suitable for different riding needs. The above is only to describe the present invention in detail by means of preferred embodiments, and any simple modifications and changes made to the embodiments do not depart from the spirit and scope of the present invention.

10: Frames 11: The first hole 12: Second hole 121: Joystick 13: The third hole 131: Polygonal output rod 13A: Epitaxial end 13B: One-way clutch 13C: Working gear 20: Power input shaft 21: Central Department 22: End 30: Eccentric cam part 31: Conical outer surface 32: Virtual axis line 40: Slider 41: Control hole 42: Sliding hole 43: Swing bar 431: Polygon slide 432: Pivot seat 44: Ball Roller 45: Elastic element 50: Transmission mechanism 51: Variable speed input 52: Shifter 521: Sun Gear 522: Planetary gear 523: Ring gear 524: Planetary carrier 53: Variable speed output 60: Control Department 61: Central control unit 62: drive motor X: Rotation axis line D: Eccentricity θ: working angle L1: first curve L2: Second curve L3: Third Curve L4: Fourth curve L5: Fifth curve L6: sixth curve L7: seventh curve L8: Eighth curve P1: Large taper position P2: Small cone position

Figure 1 is an exploded schematic view of the present invention Figure 2A is an enlarged schematic view of a portion of Figure 1 Fig. 2B is an enlarged schematic view of another part of Fig. 1 Figure 3A is a schematic diagram of the present invention Fig. 3B is an enlarged schematic view of a part of the structure of Fig. 3A Figure 4 is a schematic diagram of other angles of Figure 3A Fig. 5A is a schematic diagram of the first operation process of the present invention Fig. 5B is a schematic diagram of the second operation process of the present invention Fig. 6A is a cross-sectional view of one of the corresponding relationships of the partial structures of the present invention Fig. 6B is a cross-sectional view of the second part of the corresponding relationship of the structure of the present invention Fig. 7 is a graph of the power input of the present invention

10: Frames

12: Second hole

121: Joystick

13: The third hole

131: Polygonal output rod

13A: Epitaxial end

13B: One-way clutch

13C: Working gear

20: Power input shaft

21: Central Department

22: End

30: Eccentric cam part

31: Conical outer surface

40: Slider

41: Control hole

42: Sliding hole

43: Swing bar

431: Polygon slide

432: Pivot seat

44: Ball Roller

45: Elastic element

50: Transmission mechanism

51: Variable speed input

52: Shifter

521: Sun Gear

522: Planetary gear

523: Ring gear

524: Planetary carrier

Claims (5)

A stepless speed change device applied to a bicycle, comprising: A frame with a pair of first holes, a plurality of pairs of second holes and a plurality of pairs of third holes; a plurality of control rods are arranged between the plurality of pairs of second holes; a plurality of polygon outputs are arranged between the plurality of pairs of third holes rod; each polygonal output rod has an extension end on which a one-way clutch and a working gear are arranged; the one-way clutch is set between the extension end of the polygonal output rod and the working gear ; a power input shaft having a central part and two ends, and the power input shaft has a rotation axis; the central part is pivoted on the pair of first holes; an eccentric cam part with a conical outer surface and a virtual axis, the eccentric cam part is eccentrically arranged in the center part; the virtual axis is parallel to the rotation axis and separated by an eccentric distance; Plural sliding seats, each sliding seat has a control hole, a sliding hole, a swing rod, a spherical roller and an elastic element; the plurality of control holes are connected with the corresponding plurality of control rods, and each control When the rod is rotated, it can control the corresponding sliding seat to move on the axis of rotation, the sliding hole is for the corresponding polygonal output rod to pass through, and can slide relatively; the swing rod has a polygonal sliding seat And a pivoting seat, the polygon sliding seat is connected to the corresponding polygon output rod, and is a relatively slidable, non-rotatable structure; the elastic element is pulled to keep the corresponding spherical rollers in contact with the outer surface of the cone; a speed change mechanism having a speed change input part, a speed change part and a speed change output part, the speed change input part is engaged with the plurality of working gears; a control part connected to control the synchronous rotation of the plurality of control rods; Thereby, when power is input to either end, the power input shaft is forced to rotate, because the eccentric cam is eccentrically arranged, so that when the eccentric cam rotates once, each swinging rod will produce a reciprocating swing , its swing range is defined as a working angle, the swing lever synchronously drives the corresponding working gear to rotate the working angle in one direction, the plurality of working gears pass through the speed change input part and the speed change part, and the speed change output part output power; And when the control part controls the plurality of control rods to rotate synchronously, the plurality of sliding seats and the corresponding control rods move relative to each other, thereby changing the contact position between the spherical roller and the outer surface of the cone, and can continuously change the The size of the working angle can produce stepless speed changers. A continuously variable transmission for a bicycle as claimed in claim 1, wherein: each of the control rods is a screw; Each control hole corresponds to the screw, and is a screw hole; Therefore, when each control rod is rotated, the corresponding sliding seat can be controlled to move relative to the control rod along the axis of rotation. The stepless speed change device applied to a bicycle according to claim 1, wherein the speed change input part is a gear structure. The stepless speed change device applied to a bicycle according to claim 1, wherein the speed change part has at least a sun gear, a plurality of planetary gears, a ring gear and a planetary gear carrier. The continuously variable speed change device applied to a bicycle according to claim 1, wherein the control part comprises: a central control unit; The plurality of driving motors are arranged corresponding to the plurality of control rods, and the central control unit is connected to and controls the rotation amount of the plurality of control rods through the plurality of driving motors.

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