Continuously variable transmission

Abstract

The present invention discloses a continuously variable transmission mechanism, which relates to the technical field of variable speed transmission. The technical scheme includes a first supporting component, a second supporting component, a cam rocker assembly and a speed adjustment assembly. The cam rocker assembly includes a cam, a rocker and a rocker support shaft. One end of the rocker is in contact with the cam surface, and the other end is sleeved on the rocker support shaft. The rocker and the rocker support shaft are linked in the circumferential direction, and the rocker can move axially relative to the rocker support shaft. The cam is arranged in a conical shape in the axial direction. When the speed adjustment assembly drives the rocker to move in the axial direction, the axial contact position between the rocker and the cam is changed, thereby changing the swing angle of the rocker to achieve continuously variable speed. The present invention can optimize the axial size, so that it is easy to install on the vehicle, so as to achieve continuously variable speed during riding and optimize the riding experience.

Description

Technical Field

[0001] The present invention relates to the technical field of variable speed transmission, and more specifically, to a stepless speed change mechanism. Background Art

[0002] The existing Chinese patent with authorization announcement number CN104179908B discloses a continuously variable transmission, which includes an input part, an output shaft, a crank rocker structure, a one-way rotation prevention mechanism and a rotation radius adjustment mechanism; wherein the output shaft has a rotation center axis parallel to the rotation center axis of the input part.

[0003] However, the input shaft and output shaft of the above-mentioned continuously variable transmission are arranged in parallel, so that the continuously variable transmission cannot be installed on a riding vehicle (such as a bicycle, an electric power-assisted bicycle, and a tricycle, etc.), for example, it cannot be installed on the rear wheel of a bicycle to be used as a speed-changing hub. Moreover, the structure of the rotation radius adjustment mechanism makes the axial dimension of the continuously variable transmission larger, which is not conducive to optimizing the axial dimension to match the frame size of the riding vehicle. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a continuously variable transmission mechanism which can optimize the axial dimension so as to facilitate installation on a vehicle, thereby achieving continuously variable transmission during riding and optimizing the riding experience.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A continuously variable transmission mechanism, comprising:

[0007] A first supporting member and a second supporting member fixedly connected;

[0008] A cam rocker assembly carried between the first support member and the second support member, the cam rocker assembly comprising a cam, a rocker and a rocker support shaft, the cam rollingly supported between the first support member and the second support member, the rocker support shaft rollingly supported between the first support member and the second support member; one end of the rocker keeps in contact with the cam surface, and the other end is sleeved on the rocker support shaft; the rocker and the rocker support shaft are linked in a circumferential direction, and the rocker can move axially relative to the rocker support shaft;

[0009] Input components;

[0010] output components; and,

[0011] A speed adjustment assembly, the speed adjustment assembly is used to drive the rocker to move axially relative to the rocker support shaft;

[0012] The cam receives the torque from the input assembly and drives the rocker to swing back and forth, and the swing torque of the rocker is transmitted to the output assembly via the rocker support shaft;

[0013] The cam is arranged in a conical shape along the axial direction; when the speed adjustment component drives the rocker to move along the axial direction, the axial contact position between the rocker and the cam is changed, thereby changing the swing angle of the rocker to achieve stepless speed change.

[0014] Further, the first supporting component includes a first supporting shaft and a first supporting frame, the end of the first supporting shaft is provided with a first shaft plate, and the end surface of the first supporting frame is provided with a first fixing seat connected to the first shaft plate;

[0015] The second supporting component comprises a second supporting shaft and a second supporting frame, the end of the second supporting shaft is provided with a second shaft plate, and the end surface of the second supporting frame is provided with a second fixing seat connected with the second shaft plate;

[0016] A fixing rod is arranged between the first supporting frame and the second supporting frame.

[0017] Furthermore, a first shaft section is provided at one end of the cam, and a second shaft section is provided at the other end; a bearing is provided between the first shaft section and the first support frame, and a bearing is provided between the second shaft section and the second support frame.

[0018] Furthermore, the input component includes an input sun gear sleeved on the first shaft segment, an input planetary gear meshing with the input sun gear is arranged between the first shaft plate and the first support frame; an input sleeve is rollingly supported on the first support shaft, an input ring gear is sleeved on the input planetary gear, and a connecting rib plate is arranged between the input sleeve and the input ring gear.

[0019] Furthermore, bearings are respectively arranged between the rocker support shaft and the first support frame, and between the rocker support shaft and the second support frame; the output assembly includes an output gear sleeved on the rocker support shaft, and an output gear ring sleeved on the output gear; a one-way clutch is arranged between the output gear and the rocker support shaft, and the output gear is located between the second support frame and the second shaft plate.

[0020] Furthermore, the speed adjustment assembly includes a screw rod, on which a screw sleeve is provided; bearings are respectively provided between the screw rod and the first support frame, and between the screw rod and the second support frame; two adjustment plates are fixedly provided on the screw sleeve, the rocker support shaft passes through the adjustment plates, and the two adjustment plates clamp the rocker therein.

[0021] Furthermore, the speed adjustment assembly also includes a first gear fixedly mounted on the screw rod, a transmission shaft is passed through the second support frame and the second shaft plate; one end of the transmission shaft passes through the second support frame, and the end of the transmission shaft is sleeved with a second gear meshing with the first gear; the other end of the transmission shaft passes through the second shaft plate, and the end of the transmission shaft is sleeved with a third gear; an adjustment sleeve is rollingly supported on the second support shaft, and a fourth gear meshing with the third gear is provided on the outer wall of the adjustment sleeve.

[0022] Furthermore, an elastic member is provided between the rocker and the adjustment plate, and the elastic member is used to keep the rocker in contact with the cam.

[0023] Furthermore, a roller in contact with the cam is provided at the end of the rocker.

[0024] Furthermore, when the cam rotates one circle, the rocker performs one or more cycles of reciprocating swing.

[0025] In summary, the present invention has the following beneficial effects:

[0026] 1. The first supporting member and the second supporting member are fixedly connected to carry various components, and the first supporting member and the second supporting member are also used for the installation and fixation of the entire mechanism. The structural arrangement enables the continuously variable transmission mechanism in this embodiment to be suitable for riding vehicles, thereby improving the smoothness of the speed change during riding and optimizing the riding experience;

[0027] 2. A cam is used to drive the rocker to swing back and forth. The cam is arranged in a cone shape along the axial direction. By changing the axial contact position between the rocker and the cam, the swing angle of the rocker can be changed, thereby achieving stepless speed change. This is not only convenient for adjustment, but also conducive to optimizing the axial size of the mechanism, thereby facilitating installation matching with riding vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The structure of the continuously variable transmission mechanism in the embodiment is shown in FIG. Figure 1 ;

[0029] Figure 2 The structure of the continuously variable transmission mechanism in the embodiment is shown in FIG. Figure 2 ;

[0030] Figure 3 The structure of the continuously variable transmission mechanism in the embodiment is shown in FIG. Figure 3 ;

[0031] Figure 4 The structure of the continuously variable transmission mechanism in the embodiment is shown in FIG. Figure 4 ;

[0032] Figure 5The structure of the cam rocker assembly in the embodiment is shown in FIG. Figure 1 ;

[0033] Figure 6 The structure of the cam rocker assembly in the embodiment is shown in FIG. Figure 2 ;

[0034] Figure 7 The structure of the cam rocker assembly in the embodiment is shown in FIG. Figure 3 ;

[0035] Figure 8 The structure of the cam in the embodiment is shown in FIG. Figure 1 ;

[0036] Fig. 9 The structure of the cam in the embodiment is shown in FIG. Figure 2 ;

[0037] Fig.10 The structure of the cam in the embodiment is shown in FIG. Figure 3 ;

[0038] Fig.11 The structure of the cam in the embodiment is shown in FIG. Figure 4 ;

[0039] Fig.12 The structure of the cam in the embodiment is shown in FIG. Figure 5 .

[0040] In the figure: 1, first support shaft; 11, first shaft plate; 21, first support frame; 211, first fixed seat; 22, second support frame; 221, second fixed seat; 23, fixed rod; 3, second support shaft; 31, second shaft plate; 41, input sleeve; 42, input ring gear; 43, connecting rib plate; 44, input planetary gear; 45, input sun gear; 46, gear plate; 5, cam; 51, first shaft section; 52, second shaft section; 61, rocker support shaft; 611, keyway; 62, rocker; 621, roller; 63, output gear; 64, output ring gear; 65, adjusting plate; 71, screw; 72, screw sleeve; 73, first gear; 74, second gear; 75, transmission shaft; 76, third gear; 77, adjusting sleeve; 78, fourth gear; 79, cable; 8, wheel hub. Implementation

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0042] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law. Example

[0043] A continuously variable transmission mechanism, referring to Figures 1 to 12 , which includes a first supporting part and a second supporting part that are fixedly connected, a cam rocker assembly, an input assembly, an output assembly and a speed adjustment assembly; the cam rocker assembly is arranged between the first supporting part and the second supporting part. In this embodiment, the cam rocker assembly includes a cam 5, a rocker 62 and a rocker support shaft 61. The cam 5 is rollingly supported between the first supporting part and the second supporting part, and the rocker support shaft 61 is rollingly supported between the first supporting part and the second supporting part; one end of the rocker 62 keeps in contact with the surface of the cam 5, and the other end is sleeved on the rocker support shaft 61; the rocker 62 and the rocker support shaft 61 are linked in the circumferential direction, and the rocker 62 can move axially relative to the rocker support shaft 61; specifically, the rocker support shaft 61 is provided with an axial The key slot 611 is arranged in the direction of the rotation of the rocker 62, and the inner wall of the rocker 62 is provided with a key block that cooperates with the key slot 611; wherein, the cam 5 receives the torque from the input component and drives the rocker 62 to swing back and forth, and the swing torque of the rocker 62 is transmitted to the output component through the rocker support shaft 61; in this embodiment, the cam 5 is arranged in a conical shape along the axial direction, and the speed adjustment component is used to drive the rocker 62 to move axially relative to the rocker support shaft 61; the cam 5 in this embodiment is arranged in a conical shape along the axial direction, so the rocker 62 contacts with any axial position of the cam 5, and the rotation of the cam 5 can drive the rocker 62 to swing back and forth; when the speed adjustment component drives the rocker 62 to move axially, the axial contact position of the rocker 62 and the cam 5 is changed, thereby changing the swing angle of the rocker 62 to realize stepless speed change.

[0044] Reference Figures 1 to 12 In this embodiment, each component is carried by a first supporting member and a second supporting member that are fixedly connected, and the first supporting member and the second supporting member are also used for the installation and fixation of the entire mechanism. The structural arrangement makes the continuously variable transmission mechanism in this embodiment suitable for riding vehicles, thereby improving the smoothness of speed change during riding and optimizing the riding experience; in this embodiment, a cam 5 is used to drive the rocker 62 to swing back and forth, and the cam 5 is arranged in a conical shape along the axial direction. By changing the axial contact position between the rocker 62 and the cam 5, the swing angle of the rocker 62 can be changed, thereby realizing continuously variable speed change; this is not only convenient for adjustment, but also conducive to optimizing the axial size of the mechanism, thereby facilitating the installation of matching riding vehicles; the cam 5 rotates one circle, and the rocker 62 swings back and forth for one or more cycles; refer to Fig.11 and Fig.12 At this time, the cam 5 is a single-head cam, and a high point position H and a low point position L are set on the cam. The single-head cam rotates one circle, driving the rocker to perform a cycle of reciprocating swing; refer to Figures 8 to 10At this time, the cam 5 is a double-headed cam, and two high point positions H and two low point positions L are set on the cam, and the high point positions H and the low point positions L are arranged in sequence. The double-headed cam rotates one circle, driving the rocker to perform two cycles of reciprocating swings; wherein, the more heads the cam has, the smoother the output; in this embodiment, the cam rocker assembly includes five rockers 62, which is conducive to reducing the volatility of the rocker speed and improving the stability of the output; when the structural arrangement allows, the more rockers 62, the better.

[0045] Reference Figures 1 to 6 Specifically, in this embodiment, the first supporting component includes a first supporting shaft 1 and a first supporting frame 21, a first shaft plate 11 is provided at the end of the first supporting shaft 1, and a plurality of first fixing seats 211 connected to the first shaft plate 11 are provided on the end surface of the first supporting frame 21; the second supporting component includes a second supporting shaft 3 and a second supporting frame 22, a second shaft plate 31 is provided at the end of the second supporting shaft 3, and a plurality of second fixing seats 221 connected to the second shaft plate 31 are provided on the end surface of the second supporting frame 22; a plurality of fixing rods 23 are provided between the first supporting frame 21 and the second supporting frame 22; in this embodiment, the first supporting component and the second supporting component both adopt a split structure, which is convenient for production and assembly; a first shaft section 51 is provided at one end of the cam 5, and a second shaft section 52 is provided at the other end; a bearing is provided between the first shaft section 51 and the first supporting frame 21, and a bearing is provided between the second shaft section and the second supporting frame 22, so as to ensure the stable rotation of the cam 5.

[0046] Reference Figures 1 to 6 In this embodiment, the input assembly includes an input sun gear 45 sleeved on the first shaft section 51, and a plurality of input planetary gears 44 meshing with the input sun gear 45 are arranged between the first shaft plate 11 and the first support frame 21; specifically, a support shaft is arranged on the end surface of the first support frame 21, and a bearing is arranged between the support shaft and the input planetary gear 44; an input sleeve 41 is rollingly supported on the first support shaft 1, and specifically, a bearing is arranged between the input sleeve 41 and the first support shaft 1; an input ring gear 42 is sleeved on the input planetary gear 44, and a connecting rib plate 43 is arranged between the input sleeve 41 and the input ring gear 42; A toothed disc 46 is sleeved on the input sleeve 41, and the toothed disc 46 drives the input sleeve 41 to rotate. The input sleeve 41 drives the input gear ring 42 to rotate through the connecting rib plate 43, the input gear ring 42 drives the input planetary gear 44 to rotate, the input planetary gear 44 drives the input sun gear 45 to rotate, and the input sun gear 45 drives the cam 5 to rotate; in this embodiment, the input component adopts a planetary gear assembly, and the first supporting component is used as a planetary carrier, which is conducive to simplifying the structure, facilitating the layout, and optimizing the axial size; of course, in other optional embodiments, the input component adopts other structural forms, which are not limited here.

[0047] Reference Figures 1 to 6Specifically, in this embodiment, bearings are respectively arranged between the rocker support shaft 61 and the first support frame 21, and between the rocker support shaft 61 and the second support frame 22; at the same time, one end of the rocker support shaft 61 is embedded in the second shaft plate 31; the output assembly includes an output gear 63 sleeved on the rocker support shaft 61, and an output ring gear 64 sleeved on the output gear 63; a one-way clutch is arranged between the output gear 63 and the rocker support shaft 61, and the output gear 63 is located between the second support frame 22 and the second shaft plate 31; the cam 5 drives the rocker 62 to swing back and forth, and the rocker 62 drives the rocker support shaft 61 to swing back and forth; during the reciprocating swing of the rocker support shaft 61, the torque in one swinging direction is transmitted to the output gear 63 through the one-way clutch, and the output gear 63 drives the output ring gear 64 to rotate to realize power output.

[0048] Reference Figures 1 to 6 Specifically, in this embodiment, the speed adjustment assembly includes a screw rod 71, on which a screw sleeve 72 is sleeved; bearings are respectively provided between the screw rod 71 and the first support frame 21, and between the screw rod 71 and the second support frame 22, so as to ensure the stable rotation of the screw rod 71; two adjustment plates 65 are fixedly sleeved on the screw sleeve 72, and the rocker support shaft 61 passes through the adjustment plate 65, and the two adjustment plates 65 clamp the rocker 62 therein; rotating the screw rod 71 drives the screw sleeve 72 to move axially, and the screw sleeve 72 drives the two The adjustment plate 65 moves axially, and the two adjustment plates 65 can drive the rocker 62 to move axially to achieve speed adjustment; the speed adjustment assembly also includes a first gear 73 fixedly sleeved on the screw rod 71, and a transmission shaft 75 is inserted between the second support frame 22 and the second shaft plate 31; one end of the transmission shaft 75 passes through the second support frame 22, and the end of the transmission shaft 75 is sleeved with a second gear 74 meshing with the first gear 73; the other end of the transmission shaft 75 passes through the second shaft plate 31, and the end of the transmission shaft 75 A third gear 76 is sleeved thereon; an adjusting sleeve 77 is rollingly supported on the second support shaft 3, and a fourth gear 78 meshing with the third gear 76 is arranged on the outer wall of the adjusting sleeve 77; specifically, a bearing is arranged between the adjusting sleeve 77 and the second support shaft 3; in this embodiment, a cable 79 for controlling the rotation of the adjusting sleeve 77 is arranged on the outer wall of the adjusting sleeve 77, thereby facilitating speed adjustment; after the adjusting sleeve 77 rotates, the fourth gear 78 is driven to rotate, the fourth gear 78 drives the third gear 76 to rotate, the third gear 76 drives the second gear 74 to rotate through the transmission shaft 75, the second gear 74 drives the first gear 73 to rotate, and the first gear 73 drives the screw 71 to rotate, thereby realizing speed adjustment; in this embodiment, the speed adjustment assembly includes two screws 71, which can improve the stability of the movement of the adjustment plate 65; after arranging a plurality of output gears 63, the transmission shaft 75 is arranged to transmit the torque of the speed adjustment by utilizing the gaps between the output gears 63, which is conducive to simplifying the structure, facilitating the arrangement, and optimizing the axial size.

[0049] Reference Figures 1 to 6 In this embodiment, the output assembly also includes a wheel hub 8, and the output ring gear 64 is fixedly arranged on the inner wall of the wheel hub 8; one end of the wheel hub 8 is rollingly supported on the input sleeve 41, and the other end is rollingly supported on the adjusting sleeve 77; in this embodiment, an elastic member is arranged between the rocker 62 and the adjusting plate 65, and the elastic member is used to keep the rocker 62 in contact with the cam 5; specifically, the elastic member is a torsion spring, one end of the torsion spring is connected to the rocker 62, and the other end is connected to the adjusting plate 65; under the elastic force of the torsion spring, the rocker 62 keeps in contact with the surface of the cam 5; preferably, a roller 621 in contact with the cam 5 is arranged at the end of the rocker 62, which can reduce friction, reduce wear, and extend the service life of the mechanism.

Claims

1. A continuously variable transmission mechanism, characterized in that: include: A first supporting member and a second supporting member fixedly connected; A cam rocker assembly carried between the first support member and the second support member, the cam rocker assembly comprising a cam, a rocker and a rocker support shaft, the cam rollingly supported between the first support member and the second support member, the rocker support shaft rollingly supported between the first support member and the second support member; one end of the rocker keeps in contact with the cam surface, and the other end is sleeved on the rocker support shaft; the rocker and the rocker support shaft are linked in a circumferential direction, and the rocker can move axially relative to the rocker support shaft; Input components; Output components; as well as, A speed adjustment assembly, the speed adjustment assembly is used to drive the rocker to move axially relative to the rocker support shaft; The cam receives the torque from the input assembly and drives the rocker to swing back and forth, and the swing torque of the rocker is transmitted to the output assembly via the rocker support shaft; The cam is arranged in a conical shape along the axial direction; when the speed adjustment assembly drives the rocker to move along the axial direction, the axial contact position between the rocker and the cam is changed, thereby changing the swing angle of the rocker to achieve stepless speed change; The first supporting component comprises a first supporting shaft and a first supporting frame, the end of the first supporting shaft is provided with a first shaft plate, and the end surface of the first supporting frame is provided with a first fixing seat connected with the first shaft plate; The second supporting component comprises a second supporting shaft and a second supporting frame, the end of the second supporting shaft is provided with a second shaft plate, and the end surface of the second supporting frame is provided with a second fixing seat connected with the second shaft plate; A fixing rod is provided between the first supporting frame and the second supporting frame; A first shaft section is disposed at one end of the cam, and a second shaft section is disposed at the other end; a bearing is disposed between the first shaft section and the first support frame, and a bearing is disposed between the second shaft section and the second support frame; The speed adjustment assembly includes a screw rod, on which a screw sleeve is sleeved; bearings are respectively arranged between the screw rod and the first support frame, and between the screw rod and the second support frame; two adjustment plates are fixedly sleeved on the screw sleeve, the rocker support shaft passes through the adjustment plates, and the two adjustment plates clamp the rocker therein.

2. The continuously variable transmission mechanism according to claim 1, characterized in that: The input assembly includes an input sun gear sleeved on the first shaft section, an input planetary gear meshing with the input sun gear is arranged between the first shaft plate and the first support frame; an input sleeve is rollingly supported on the first support shaft, an input gear ring is sleeved on the input planetary gear, and a connecting rib plate is arranged between the input sleeve and the input gear ring.

3. The continuously variable transmission mechanism according to claim 1, characterized in that: Bearings are respectively arranged between the rocker support shaft and the first support frame, and between the rocker support shaft and the second support frame; the output assembly includes an output gear sleeved on the rocker support shaft, and an output gear ring sleeved on the output gear; a one-way clutch is arranged between the output gear and the rocker support shaft, and the output gear is located between the second support frame and the second shaft plate.

4. The continuously variable transmission mechanism according to claim 1, characterized in that: The speed adjustment assembly also includes a first gear fixedly mounted on the screw rod, a transmission shaft is passed through the second support frame and the second shaft plate; one end of the transmission shaft passes through the second support frame, and the end of the transmission shaft is sleeved with a second gear meshing with the first gear; the other end of the transmission shaft passes through the second shaft plate, and the end of the transmission shaft is sleeved with a third gear; an adjustment sleeve is rollingly supported on the second support shaft, and a fourth gear meshing with the third gear is provided on the outer side wall of the adjustment sleeve.

5. The continuously variable transmission mechanism according to claim 1, characterized in that: An elastic member is arranged between the rocking arm and the adjusting plate, and the elastic member is used to keep the rocking arm in contact with the cam.

6. The continuously variable transmission mechanism according to claim 1, characterized in that: The end of the rocker is provided with a roller which contacts the cam.

7. The continuously variable transmission mechanism according to claim 1, characterized in that: When the cam rotates one circle, the rocker performs one or more cycles of reciprocating swing.

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