Gearbox capable of loading upshift and downshift and bicycle thereof

Abstract

The invention relates to the technical field of transmission systems, in particular to a gearbox capable of loading upshift and downshift and a bicycle thereof, which comprise a box body, a gear shifting control system, a main shaft, an auxiliary shaft, an M-gear main shaft gear, an M-gear auxiliary shaft gear and a ratchet wheel, the gear shifting control system comprises an elastic shifting fork mechanism, a gear retreating piece and a gear shifting driving mechanism used for driving the elastic shifting fork mechanism and the gear retreating piece to move. When the speed changing box is changed into the low gear from the M gear, in the continuous rotation process of the main shaft load, the gear retreating piece is adopted to abut against the ratchet wheel to enable the ratchet wheel to retreat from the main shaft gear of the M gear, then the ratchet wheel is pulled back to the preset position through the elastic shifting fork mechanism, and therefore load unloading and gear downshifting are not needed in the process that the speed changing box is downshifted into the low gear from the high gear. For example, the bicycle can be downshifted without stopping pedaling, and the load rotation of the main shaft is effectively utilized to reverse the gear. The speed changing box is smooth in gear lifting, greatly reduces the risk of abrasion and damage of the speed changing box, prolongs the service life, and reduces the failure rate and the use cost.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission systems, and in particular to a gearbox capable of load upshifting and downshifting and a bicycle thereof. Background Art

[0002] In the transmission system of a gearbox, in order to achieve the mechanism for changing the transmission between different gear pairs of the gearbox, a shift control system is required for shifting gears. As Figure 1 shown, in the existing gearbox, the pawl of the shift control system is arranged inside the countershaft. When shifting gears, the pawl is pushed by pulling the cable by hand to hide in the countershaft. When the gearbox is under load and needs to shift gears, the pawl cannot be pulled out because it cannot be pulled, and at this time, it is necessary to forcibly pull out the pawl after stopping pedaling to disengage it, which has risks such as cable breakage or pawl deformation and jamming.

[0003] Based on the deficiencies of the above-mentioned gearbox, there is an urgent need to provide a solution to overcome the above technical problems. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a gearbox capable of load upshifting and downshifting, which has smooth upshifting and downshifting, greatly reduces the risk of wear and damage of the gearbox, extends the service life, reduces the failure rate and usage cost, and can effectively avoid problems such as the need to stop pedaling to downshift in the existing gearbox, cable breakage or pawl deformation and jamming.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a gearbox capable of load upshifting and downshifting, including a box body and a shift control system; a main shaft and a countershaft are installed in parallel in the box body, an M-gear main shaft gear is installed on the main shaft, an M-gear countershaft gear meshing with the M-gear main shaft gear is installed on the countershaft, a ratchet wheel meshing with the M-gear main shaft gear is slidably installed on the main shaft, and the ratchet wheel is drivingly connected to the shift control system;

[0007] The shift control system includes an elastic fork mechanism, a reverse gear member, and a shift driving mechanism for driving the elastic fork mechanism and the reverse gear member to move;

[0008] When shifting from a low gear to the M gear, the shift driving mechanism drives the elastic fork mechanism and the reverse gear member to move from a preset position towards the M-gear main shaft gear, so that the elastic fork mechanism drives the ratchet wheel to mesh with the M-gear main shaft gear, realizing upshifting of the gearbox;

[0009] When shifting from the M gear to the low gear, the gear shift drive mechanism drives the elastic fork mechanism and the back-off member to move away from the M gear main shaft gear to a preset position. During the continued rotation of the main shaft, the back-off member contacts the ratchet to make the ratchet exit the M gear main shaft gear. The elastic fork mechanism pulls the ratchet back to the preset position to realize the gearbox downshift and disengagement.

[0010] Wherein, the ratchet is provided with an axially protruding back-shifting protrusion, and the back-shifting member is located on one side of the back-shifting protrusion; when changing from the M gear to the low gear, the back-shifting member contacts the back-shifting protrusion of the ratchet, causing the ratchet to exit the M gear main shaft gear.

[0011] Preferably, there are two retraction protrusions, which are arranged on both sides of the ratchet, and the retraction member is located between the two retraction protrusions.

[0012] Wherein, the shift control system is provided with a shift guide rod, and the elastic fork mechanism and the backshift member are both slidably mounted on the shift guide rod.

[0013] Preferably, the gear shift drive mechanism includes a gear shift drum stick and a drum stick drive mechanism for driving the gear shift drum stick to rotate; the gear shift drum stick is provided with a plurality of gear shift drive grooves, and the guide pin at the upper end of the elastic fork mechanism and the guide pin at the upper end of the retracting member are respectively movably arranged in the gear shift drive grooves.

[0014] Preferably, the ratchet is provided with a neutral positioning hole, and the main shaft is provided with an elastic positioning bead structure. When the ratchet is in neutral, the positioning beads of the elastic positioning bead structure are inserted into the neutral positioning hole.

[0015] Preferably, the gearbox capable of load-carrying up and down gears includes a first-speed gear set, a fifth-speed gear set, a third-speed gear set, a fourth-speed gear set and a second-speed gear set arranged in sequence along the axial direction of the main shaft; the M-speed main shaft gear and the M-speed countershaft gear are any one of the fifth-speed gear set, the third-speed gear set, the fourth-speed gear set and the second-speed gear set.

[0016] Preferably, the gearbox capable of load-carrying up and down gears is also provided with an anti-neutral gear mechanism, the anti-neutral gear mechanism comprising at least one pawl member installed in the first-gear countershaft gear on the countershaft and a reset member for resetting the pawl member; the pawl member is located in the first-gear countershaft gear; when in use, when the countershaft drives the pawl member to rotate, the pawl member slips in the first-gear countershaft gear; when the main shaft drives the first-gear mainshaft gear and the first-gear countershaft gear to rotate, the pawl member engages with the first-gear countershaft gear, so that the pawl member drives the countershaft to rotate.

[0017] The secondary shaft is provided with a pawl groove, the pawl member is provided with a mounting portion that cooperates with the pawl groove, and the mounting portion is mounted in the pawl groove; the pawl member is further provided with a pawl portion, one side of the pawl portion is provided with an arc-shaped sliding surface, and the other side of the pawl portion is provided with an engaging surface;

[0018] The pawl member is provided with a first fixing groove, the secondary shaft is provided with a second fixing groove, the reset member is an annular spring, and the reset member is embedded in the first fixing groove and the second fixing groove to install the pawl member on the secondary shaft; the reset member always makes the pawl part of the pawl member tilt up and extend out of the pawl groove.

[0019] The present invention also provides a bicycle comprising the above-mentioned gearbox capable of shifting up and down under load.

[0020] Beneficial effects of the present invention:

[0021] The present transmission and bicycle capable of shifting gears under load, when changing from the M gear to the low gear, uses the continuing rotation of the main shaft load to utilize the retracting member to come into contact with the ratchet to make the ratchet withdraw from the M gear main shaft gear, and then uses the elastic shift fork mechanism to pull the ratchet back to the preset position, thereby realizing the transmission downshifting from high gear to low gear without unloading the load. For example, the bicycle can be downshifted without stopping to pedal, and the load rotation of the main shaft is effectively utilized to downshift. Compared with the existing transmissions that require stopping to pedal to downshift, have the possibility of cable breakage or ratchet deformation and jamming, the present transmission shifts gears smoothly, greatly reduces the risk of transmission wear and damage, extends the service life, and reduces the failure rate and use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the existing gearbox.

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the gearbox after the box body is hidden.

[0024] Figure 3 This is a schematic diagram of the exploded structure of the gearbox after the box body is hidden.

[0025] Figure 4 It is a three-dimensional structural diagram of the installation structure of the gear shifting control system, main shaft, M gear main shaft gear and ratchet according to the present invention.

[0026] Figure 5 for Figure 3 Schematic diagram of the structure at point A.

[0027] Figure 6 It is a schematic diagram of the exploded structure of the secondary shaft, pawl member and reset member of the present invention.

[0028] Figure 7Schematic structural diagram of the countershaft, ratchet pawl member and reset member of the present invention.

[0029] Figure 8 is Figure 7 Schematic enlarged cross-sectional structure diagram at D-D in [the figure].

[0030] Figure 9 is Figure 7 Schematic enlarged cross-sectional structure diagram at C-C in [the figure].

[0031] Figure 10 Stereoscopic schematic diagram of the ratchet pawl member and reset member of the present invention. Detailed implementation manners

[0032] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the implementation manners does not limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0033] Referring to Figures 2 to 10 As shown, the present invention discloses a gearbox capable of load-lifting gear shifting, including a box body and a gear shifting control system 6; a main shaft 1 and a countershaft 2 are installed in parallel in the box body. An M-gear main shaft gear 3 is installed on the main shaft 1, and an M-gear countershaft gear 4 meshing with the M-gear main shaft gear 3 is installed on the countershaft 2. A ratchet wheel 5 meshing with the M-gear main shaft gear 3 is slidably installed on the main shaft 1, and the ratchet wheel 5 is drivingly connected to the gear shifting control system 6;

[0034] The gear shifting control system 6 includes an elastic fork mechanism 61, a gear disengaging member 62, and a gear shifting drive mechanism 63 for driving the elastic fork mechanism 61 and the gear disengaging member 62 to move;

[0035] When shifting from a low gear to the M gear, the gear shifting drive mechanism 63 drives the elastic fork mechanism 61 and the gear disengaging member 62 to move from a preset position towards the M-gear main shaft gear 3, so that the elastic fork mechanism 61 drives the ratchet wheel 5 to mesh with the M-gear main shaft gear 3, realizing gear upshift of the gearbox. At this time, because the rotational speed of the M gear is higher, the ratchet wheel of this low gear will disengage from the main shaft gear of this low gear, realizing smooth separation;

[0036] When shifting from the M gear to a low gear, the gear shifting drive mechanism 63 drives the elastic fork mechanism 61 and the gear disengaging member 62 to move away from the M-gear main shaft gear 3 to a preset position. During the continuous rotation of the main shaft 1, the gear disengaging member 62 abuts against the ratchet wheel 5 to make the ratchet wheel 5 disengage from the M-gear main shaft gear 3, and the elastic fork mechanism 61 pulls the ratchet wheel 5 back to the preset position, realizing gear downshift disengagement of the gearbox.

[0037] In this embodiment, the M gear is the gear with the non-lowest rotational speed of the gearbox, that is, the first gear of the gearbox.

[0038] The gearbox capable of shifting up and down under load, when changing from the M gear to the low gear, uses the continuing rotation of the main shaft 1 under load to use the retracting member 62 to interfere with the ratchet 5 to make the ratchet 5 withdraw from the M gear main shaft gear 3, and then uses the elastic fork mechanism 61 to pull the ratchet 5 back to the preset position, thereby realizing the gearbox downshifting from a high gear to a low gear without unloading the load. For example, a bicycle can be downshifted without stopping to pedal, and the load rotation of the main shaft 1 is effectively used to downshift. Compared with the existing gearbox that needs to stop to pedal to downshift, has the possibility of cable breakage or pawl deformation and jamming, the gearbox of this gearbox shifts up and down smoothly, greatly reduces the risk of gearbox wear and damage, extends the service life, and reduces the failure rate and use cost.

[0039] In this embodiment, the ratchet 5 is provided with an axially protruding retraction projection 51, with the retraction member 62 located to one side of the retraction projection 51. When shifting from the M gear to the low gear position, the retraction member 62 contacts the retraction projection 51 of the ratchet 5, causing the ratchet 5 to retract from the M gear mainshaft gear 3. Specifically, the retraction projection 51 is arc-shaped, and the retraction member 62 contacts the retraction projection 51, forcing the ratchet 5 away from the M gear mainshaft gear 3, thereby separating the ratchet 5 from the M gear mainshaft gear 3 and achieving retraction. The retraction member 62 and retraction projection 51 contact structure makes retraction direct. Compared to a structure where the ratchet 5 is pulled by a wire, it is more durable and stable, reducing the failure rate of the transmission.

[0040] In this embodiment, there are two return protrusions 51, which are arranged on both sides of the ratchet 5, and the return member 62 is located between the two return protrusions 51; the load-carrying shift-up and shift-down gearbox includes a first-speed gear set 100, a fifth-speed gear set 500, a third-speed gear set 300, a fourth-speed gear set 400 and a second-speed gear set 200 arranged in sequence along the axial direction of the main shaft 1; the M-speed mainshaft gear 3 and the M-speed countershaft gear 4 are any one of the fifth-speed gear set 500, the third-speed gear set 300, the fourth-speed gear set 400 and the second-speed gear set 200.

[0041] Specifically, in a five-speed gearbox, a double-sided ratchet 5 can be provided between the fifth-speed gear set 500 and the third-speed gear set 300, and another double-sided ratchet 5 can be provided between the fourth-speed gear set 400 and the second-speed gear set 200; two retraction protrusions 51 are provided on the ratchet 5, so that retraction of the second-speed gear set 200, the third-speed gear set 300, the fourth-speed gear set 400 and the fifth-speed gear set 500 can be achieved. The five-speed gearbox structure enables adjacent gear sets to share the same ratchet 5 and retraction member 62, making its structure simpler and, at the same time, greatly reducing the volume of the gearbox.

[0042] In this embodiment, a shift guide rod 64 is provided in the shift control system 6. The elastic fork mechanism 61 and the reverse gear member 62 are both slidably mounted on the shift guide rod 64, facilitating the installation of the elastic fork mechanism 61 and the reverse gear member 62, and making the movement of the elastic fork mechanism 61 and the reverse gear member 62 more stable during shifting.

[0043] In this embodiment, the elastic fork mechanism 61 can adopt an existing fork mechanism, so it will not be elaborated here.

[0044] In this embodiment, the shift driving mechanism 63 includes a shift drum rod 631 and a drum rod driving mechanism for driving the rotation of the shift drum rod 631; a plurality of shift driving grooves 6311 are provided on the shift drum rod 631, and the guide pins at the upper ends of the elastic fork mechanism 61 and the reverse gear member 62 are respectively movably arranged in the shift driving grooves 6311. Specifically, the drum rod driving mechanism can adopt a cable mechanism or a motor mechanism, etc. to drive the rotation of the shift drum rod 631, and it can be realized by an existing mechanism, so it will not be elaborated here.

[0045] In this embodiment, a neutral position locating hole 52 is provided in the ratchet wheel 5, and an elastic positioning bead structure is provided on the main shaft 1. When the ratchet wheel 5 is in the neutral position, the positioning bead of the elastic positioning bead structure is snapped into the neutral position locating hole 52, thereby preventing the ratchet wheel 5 from shaking and gear jumping, and making it more stable and reliable during use. Specifically, the elastic positioning bead structure can adopt an existing structure with a spring abutting against the positioning bead.

[0046] In this embodiment, the load-bearing shiftable transmission further includes an anti-neutral gear mechanism, which includes at least one pawl member 05 installed in the first gear countershaft gear 04 on the countershaft 2 and a reset member 06 for resetting the pawl member 05;

[0047] The pawl member 05 is located in the first gear countershaft gear 04; during use, when the countershaft 2 drives the pawl member 05 to rotate, the pawl member 05 slips in the first gear countershaft gear 04; when the main shaft 1 drives the first gear main shaft gear 03 and the first gear countershaft gear 04 to rotate, the pawl member 05 meshes with the first gear countershaft gear 04, so that the pawl member 05 drives the countershaft 2 to rotate.

[0048] In actual application, when the gearbox is in normal use, when the countershaft 2 drives the pawl member 05 to rotate, the pawl member 05 slips within the first-gear countershaft gear 04, and the pawl member 05 cannot engage and drive with the first-gear countershaft gear 04, without affecting the transmission of other high-gear gears; when the shift cable of the gearbox breaks, or the drum rod mechanism or slider mechanism in the shift control system is deformed, jammed, etc., resulting in the gearbox being unable to shift gears, the main shaft 1 drives the first-gear main shaft gear 03 to rotate, the first-gear main shaft gear 03 drives the first-gear countershaft gear 04 to rotate, the first-gear countershaft gear 04 engages with the pawl member 05 and drives the countershaft 2 to rotate, thereby preventing the gearbox from being in a neutral state.

[0049] This anti-neutral mechanism can always ensure that the gearbox is not in a neutral state, thereby avoiding the riding danger of the bicycle in the neutral state, ensuring riding safety, and ensuring the safety and reliability of the product. At the same time, by directly installing the pawl member 05 and the reset member 06 on the countershaft 2 within the first-gear countershaft gear 04, the installation space between the first-gear countershaft gear 04 and the countershaft 2 is effectively utilized, making its structure more compact, which is conducive to reducing the overall volume of the gearbox, reducing the weight of the gearbox and the bicycle, and it has strong practicality.

[0050] In this embodiment, the countershaft 2 is provided with a pawl groove 21, the pawl member 05 is provided with a mounting portion 051 that cooperates with the pawl groove 21, and the mounting portion 051 is installed in the pawl groove 21, facilitating the installation of the pawl member 05.

[0051] In this embodiment, the pawl member 05 is further provided with a pawl portion 052. One side of the pawl portion 052 is provided with an arc-shaped sliding surface 0521, and the other side of the pawl portion 052 is provided with an engaging surface 0522; specifically, the structures of the pawl portion 052 and the mounting portion 051 make the pawl member 05 as a whole in a wedge shape; the arc-shaped sliding surface 0521 facilitates the pawl member 05 to slide out of the tooth groove of the first-gear countershaft gear 04, so that it slips and does not engage, and the engaging surface 0522 enables the pawl portion 052 to engage with the tooth groove of the first-gear countershaft gear 04, thereby driving the first-gear countershaft gear 04 and the countershaft 2 to rotate, so that the gearbox is not in a neutral state.

[0052] During actual use, both the first-gear main shaft gear 03 and the first-gear countershaft gear 04 are set as the first gear of the gearbox. When other gears, such as the second gear to the fifth gear, can be shifted and changed gears normally, the rotational speed of the countershaft 2 driving the pawl member 05 is higher than the rotational speed of the first-gear countershaft gear 04, causing the arc-shaped sliding surface 0521 of the pawl member 05 to contact the tooth groove of the first-gear countershaft gear 04, so that it slips and idles without engaging, without affecting the use of other gears.

[0053] In this embodiment, the pawl member 05 is provided with a first fixing groove 053, and the countershaft 2 is provided with a second fixing groove 22. The reset member 06 is an annular spring. The reset member 06 engages with the first fixing groove 053 and the second fixing groove 22 to mount the pawl member 05 on the countershaft 2. The reset member 06 holds the pawl member 05 in place, constantly tilting the pawl portion 052 of the pawl member 05 out of the pawl groove 21. When the pawl member 05 comes into contact with the first gear countershaft gear 04 and slips, the pawl member 05 is pressed downward by the first gear countershaft gear 04 and slides past it. The elasticity of the reset member 06 again tilts the pawl portion 052 out of the pawl groove 021.

[0054] The matching structure of the countershaft 2, the first-gear countershaft gear 04, the reset member 06 and the ratchet member 05 of this gearbox is easy to install and replace, and the structural design is ingenious. It reduces at least one set of gear-shift ratchet mechanisms for separating and engaging the gears of the gears, reduces the space occupied by the internal space of the gearbox, and makes the gearbox smaller, lighter and safer.

[0055] The present invention also provides a bicycle comprising the aforementioned load-shifting transmission. The load-shifting transmission employed in this bicycle allows the transmission to downshift from a high gear to a low gear without unloading the load. For example, the bicycle can downshift without stopping to pedal, effectively utilizing the load-bearing rotation of the main shaft 1. Compared to conventional transmissions that require stopping to downshift and are subject to cable breakage or pawl deformation and jamming, this transmission allows for smoother shifting, significantly reducing the risk of wear and damage, extending its service life, and lowering its failure rate and operating costs.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are all within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A gearbox capable of load upshifting and downshifting, comprising a box body and a shift control system (6); a main shaft (1) and a countershaft (2) are installed in parallel in the box body, an M-gear main shaft gear (3) is installed on the main shaft (1), an M-gear countershaft gear (4) meshing with the M-gear main shaft gear (3) is installed on the countershaft (2), a ratchet wheel (5) meshing with the M-gear main shaft gear (3) is slidably installed on the main shaft (1), and the ratchet wheel (5) is drivingly connected to the shift control system (6); characterized in that: The shift control system (6) includes an elastic fork mechanism (61), a reverse gear member (62), and a shift driving mechanism (63) for driving the elastic fork mechanism (61) and the reverse gear member (62) to move; When shifting from a low gear to the M gear, the shift driving mechanism (63) drives the elastic fork mechanism (61) and the reverse gear member (62) to move from a preset position towards the M-gear main shaft gear (3), so that the elastic fork mechanism (61) drives the ratchet wheel (5) to mesh with the M-gear main shaft gear (3), realizing upshifting of the gearbox; When shifting from the M gear to a low gear, the shift driving mechanism (63) drives the elastic fork mechanism (61) and the reverse gear member (62) to move away from the M-gear main shaft gear (3) to a preset position. During the continuous rotation of the main shaft (1), the reverse gear member (62) abuts against the ratchet wheel (5) to cause the ratchet wheel (5) to disengage from the M-gear main shaft gear (3), and the elastic fork mechanism (61) pulls the ratchet wheel (5) back to the preset position, realizing downshifting and disengagement of the gearbox.

2. The gearbox capable of load upshift and downshift according to claim 1, wherein: The ratchet wheel (5) is provided with a reverse gear projection (51) protruding axially, and the reverse gear member (62) is located on one side of the reverse gear projection (51); When shifting from the M gear to a low gear, the reverse gear member (62) abuts against the reverse gear projection (51) of the ratchet wheel (5), causing the ratchet wheel (5) to disengage from the M-gear main shaft gear (3).

3. The transmission capable of load upshift and downshift according to claim 2, characterized in that: There are two reverse gear projections (51), and the two reverse gear projections (51) are arranged on both sides of the ratchet wheel (5), and the reverse gear member (62) is located between the two reverse gear projections (51).

4. The transmission capable of load upshift and downshift according to claim 1, wherein: The shift control system (6) is provided with a shift guide rod (64), and both the elastic fork mechanism (61) and the reverse gear member (62) are slidably installed on the shift guide rod (64).

5. The gearbox capable of load upshift and downshift according to claim 1, wherein: The shift driving mechanism (63) includes a shift drum rod (631) and a drum rod driving mechanism for driving the shift drum rod (631) to rotate; The shift drum rod (631) is provided with a plurality of shift driving grooves (6311), and the guide pins at the upper ends of the elastic fork mechanism (61) and the reverse gear member (62) are respectively movably arranged in the shift driving grooves (6311).

6. The transmission capable of load upshift and downshift according to claim 1, wherein: The ratchet wheel (5) is provided with a neutral position locating hole (52), and the main shaft (1) is provided with an elastic positioning bead structure. When the ratchet wheel (5) is in the neutral position, the positioning bead of the elastic positioning bead structure is snapped into the neutral position locating hole (52).

7. The transmission capable of load upshift and downshift according to claim 1, wherein: The gearbox capable of load upshift and downshift includes a first-gear gear set (100), a fifth-gear gear set (500), a third-gear gear set (300), a fourth-gear gear set (400), and a second-gear gear set (200) arranged in sequence along the axis direction of the main shaft (1); The M-gear main shaft gear (3) and the M-gear countershaft gear (4) are any one of the fifth-gear gear set (500), the third-gear gear set (300), the fourth-gear gear set (400), and the second-gear gear set (200).

8. The gearbox capable of load upshift and downshift according to claim 1, characterized in that: The gearbox capable of load upshift and downshift is further provided with an anti-neutral gear mechanism, which includes at least one pawl member (05) installed in the first-gear countershaft gear (04) on the countershaft (2) and a reset member (06) for resetting the pawl member (05); The pawl member (05) is located within the first-gear countershaft gear (04); during use, when the countershaft (2) drives the pawl member (05) to rotate, the pawl member (05) slips within the first-gear countershaft gear (04); when the main shaft (1) drives the first-gear main shaft gear (03) and the first-gear countershaft gear (04) to rotate, the pawl member (05) meshes with the first-gear countershaft gear (04) so that the pawl member (05) drives the countershaft (2) to rotate.

9. The transmission capable of load upshift and downshift according to claim 8, characterized in that: The countershaft (2) is provided with a pawl groove (21), and the pawl member (05) is provided with a mounting portion (051) that cooperates with the pawl groove (21), and the mounting portion (051) is installed in the pawl groove (21); The pawl member (05) is further provided with a pawl portion (052), one side of the pawl portion (052) is provided with an arc-shaped sliding surface (0521), and the other side of the pawl portion (052) is provided with a meshing surface (0522); The pawl member (05) is provided with a first fixing groove (053), the countershaft (2) is provided with a second fixing groove (22), the reset member (06) is an annular spring, and the reset member (06) is embedded in the first fixing groove (053) and the second fixing groove (22) to install the pawl member (05) on the countershaft (2); the reset member (06) always causes the pawl portion (052) of the pawl member (05) to protrude out of the pawl groove (21).

10. A bicycle, characterized in that: The bicycle includes the gearbox capable of load upshift and downshift according to any one of claims 1-9.

Images