Gear shifting control mechanism capable of loading upshift and downshift

Abstract

The utility model relates to the technical field of transmission systems, in particular to a gear shifting control mechanism capable of loading up and down gears, which comprises a gear shifting mechanism and a ratchet wheel which is slidably mounted on a spindle and meshed with an M-gear spindle gear. The gear shifting mechanism 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] This utility model relates to the field of transmission system technology, and in particular to a shifting control mechanism capable of load shifting up and down. Background Technology

[0002] In a gearbox transmission system, a gear shifting system is needed to achieve the transmission and change of gears between different gear pairs. For example... Figure 1 As shown, in existing gearboxes, the pawl of the shift control system is located inside the countershaft. When shifting gears, the pawl is engaged by pulling a cable, which keeps it in the countershaft. When the gearbox is under load, the pawl may not be able to be pulled out when shifting gears, preventing it from disengaging. In this case, the pedal must be stopped and the pawl must be forcibly pulled out to disengage it, which carries the risk of cable breakage or pawl deformation and jamming.

[0003] Given the shortcomings of the aforementioned gearboxes, there is an urgent need to provide a solution to overcome these technical problems. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a shifting control mechanism capable of load-bearing upshifting and downshifting. Its shifting and downshifting are smooth, greatly reducing the risk of wear and damage to the gearbox, extending its service life, reducing the failure rate and operating costs, and effectively avoiding problems such as the need to stop and pedal downshift in existing gearboxes, as well as cable breakage or ratchet deformation and jamming.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides a load-bearing shifting control mechanism, including a shifting mechanism and a ratchet slidably mounted on the main shaft and meshing with the M gear main shaft gear; the ratchet is driven to the shifting mechanism; the shifting mechanism includes a flexible shift fork mechanism, a retraction component, and a shifting drive mechanism for driving the flexible shift fork mechanism and the retraction component to move;

[0007] When shifting from a low gear to an M gear, the shift drive mechanism drives the elastic shift fork mechanism and the de-shifting component to move from a preset position toward the M gear main shaft gear, so that the elastic shift fork mechanism drives the ratchet to mesh with the M gear main shaft gear, thereby realizing the upshift of the gearbox.

[0008] When shifting from M gear to a lower gear, the shift drive mechanism drives the elastic shift fork mechanism and the retraction component to move away from the M gear main shaft gear to a preset position. As the main shaft continues to rotate, the retraction component abuts against the ratchet to disengage the ratchet from the M gear main shaft gear. The elastic shift fork mechanism pulls the ratchet back to the preset position, thus disengaging the gearbox from downshift.

[0009] The ratchet is provided with a retraction protrusion that protrudes axially, and the retraction member is located on one side of the retraction protrusion. When shifting from the M gear to a lower gear, the retraction member abuts against the retraction protrusion of the ratchet, causing the ratchet to disengage from the M gear main shaft gear.

[0010] Preferably, there are two retraction protrusions, which are located on both sides of the ratchet, and the retraction member is located between the two retraction protrusions.

[0011] The gear shifting mechanism is provided with a gear shifting guide rod, and the elastic shift fork mechanism and the retraction component are slidably mounted on the gear shifting guide rod.

[0012] Preferably, the shift drive mechanism includes a shift drum and a drum drive mechanism for driving the shift drum to rotate; the shift drum is provided with a plurality of shift drive slots, and the guide pin at the upper end of the elastic shift fork mechanism and the guide pin at the upper end of the retraction component are respectively movably disposed in the shift drive slots.

[0013] 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 bead of the elastic positioning bead structure is engaged in the neutral positioning hole.

[0014] The beneficial effects of this utility model are:

[0015] This transmission's shifting mechanism, capable of handling both upshifting and downshifting, utilizes the continued rotation of the main shaft under load to engage with the ratchet, disengaging it from the M-gear main shaft gear. A flexible shift fork then pulls the ratchet back to a preset position. This allows the transmission to downshift without unloading, similar to a bicycle downshifting without stopping the pedals. Furthermore, it effectively utilizes the rotation of the main shaft under load for downshifting. Compared to existing transmissions that require stopping the pedals for downshifting and are susceptible to issues like broken cables or deformed pawls, this transmission offers smoother shifting, significantly reducing wear and damage, extending service life, and lowering failure rates and operating costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an existing gearbox.

[0017] Figure 2 This is a three-dimensional structural diagram of the gearbox housing hidden in this utility model.

[0018] Figure 3 This is an exploded structural diagram of the gearbox housing hidden in this utility model.

[0019] Figure 4 This is a schematic diagram showing the usage state of the shift control mechanism of this utility model, which can be loaded to shift up and down. Detailed Implementation

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0021] refer to Figures 2 to 4 As shown, this utility model discloses a shifting control mechanism capable of load-bearing upshifting and downshifting, including a shifting mechanism 6 and a ratchet 5 slidably mounted on the main shaft 1 and meshing with the M gear main shaft gear 3; the ratchet 5 is drivenly connected to the shifting mechanism 6; the shifting mechanism 6 includes an elastic shift fork mechanism 61, a retraction member 62, and a shifting drive mechanism 63 for driving the elastic shift fork mechanism 61 and the retraction member 62 to move;

[0022] When shifting from a low gear to an M gear, the shift drive mechanism 63 drives the elastic shift fork mechanism 61 and the de-shifting component 62 to move from a preset position toward the M gear main shaft gear 3, so that the elastic shift fork mechanism 61 drives the ratchet 5 to mesh with the M gear main shaft gear 3, thereby realizing the upshift of the gearbox.

[0023] When shifting from M gear to a lower gear, the shift drive mechanism 63 drives the elastic shift fork mechanism 61 and the retraction member 62 away from the M gear main shaft gear 3 to a preset position. As the main shaft 1 continues to rotate, the retraction member 62 abuts against the ratchet 5 to disengage the ratchet 5 from the M gear main shaft gear 3. The elastic shift fork mechanism 61 pulls the ratchet 5 back to the preset position, thus disengaging the gearbox from downshift.

[0024] In actual use, the shifting mechanism capable of shifting up and down is used in the gearbox, which also has a housing; a countershaft 2 is installed in the housing, parallel to the main shaft 1, and an M-gear countershaft gear 4 is installed on the countershaft 2, which meshes with the M-gear main shaft gear 3. In this embodiment, the M-gear is the lowest speed gear of the non-gearbox, i.e., the first gear of the non-gearbox.

[0025] This transmission, capable of shifting up and down, utilizes the continued rotation of the main shaft 1 under load when shifting from M gear to a lower gear. The retraction component 62 engages with the ratchet 5, causing it to disengage from the M gear main shaft gear 3. Then, the elastic shift fork mechanism 61 pulls the ratchet 5 back to a preset position. This allows the transmission to downshift without unloading, similar to how a bicycle can downshift without stopping the pedals. Furthermore, it effectively utilizes the load rotation of the main shaft 1 for downshifting. Compared to existing transmissions that require stopping the pedals for downshifting and are susceptible to issues like broken cables or deformed pawls, this transmission offers smoother shifting, significantly reducing the risk of wear and damage, extending service life, and lowering failure rates and operating costs.

[0026] In this embodiment, the ratchet 5 is provided with an axially protruding de-shifting protrusion 51, and the de-shifting member 62 is located on one side of the de-shifting protrusion 51. When shifting from M gear to a lower gear, the de-shifting member 62 abuts against the de-shifting protrusion 51 of the ratchet 5, causing the ratchet 5 to disengage from the M gear main shaft gear 3. Specifically, the de-shifting protrusion 51 has an arc-shaped transition. The de-shifting member 62 abuts against the de-shifting protrusion 51, forcing the ratchet 5 to move away from the M gear main shaft gear 3, thereby separating the ratchet 5 from the M gear main shaft gear 3, thus achieving de-shifting. The structure of the de-shifting member 62 abutting against the de-shifting protrusion 51 makes de-shifting direct. Compared with the structure of pulling the ratchet 5 with a cable, it is more durable and stable, resulting in a lower transmission failure rate.

[0027] In this embodiment, two reversing protrusions 51 are provided, located on both sides of the ratchet 5, and the reversing member 62 is located between the two reversing protrusions 51. Preferably, the gearbox includes a first gear set 100, a fifth gear set 500, a third gear set 300, a fourth gear set 400, and a second gear set 200 arranged sequentially along the axial direction of the main shaft 1; the M-position main shaft gear 3 and the M-position countershaft gear 4 are any one of the fifth gear set 500, the third gear set 300, the fourth gear set 400, and the second gear set 200.

[0028] Specifically, in a five-speed gearbox, a double-sided ratchet 5 can be installed between the fifth gear set 500 and the third gear set 300, and another double-sided ratchet 5 can be installed between the fourth gear set 400 and the second gear set 200. Two unshifting protrusions 51 are provided on the ratchet 5, thereby enabling the unshifting of the second gear set 200, the third gear set 300, the fourth gear set 400, and the fifth gear set 500. This five-speed gearbox structure allows adjacent gear sets to share the same ratchet 5 and unshifting component 62, making its structure simpler and greatly reducing the size of the gearbox.

[0029] In this embodiment, the gear shifting mechanism 6 is provided with a gear shifting guide rod 64, and the elastic shift fork mechanism 61 and the retraction component 62 are slidably installed on the gear shifting guide rod 64, which facilitates the installation of the elastic shift fork mechanism 61 and the retraction component 62, and makes the movement of the elastic shift fork mechanism 61 and the retraction component 62 more stable when shifting gears.

[0030] In this embodiment, the elastic shift fork mechanism 61 can be an existing shift fork mechanism, so it will not be described in detail.

[0031] In this embodiment, the gear shifting drive mechanism 63 includes a gear shifting drumstick 631 and a drumstick drive mechanism for driving the gear shifting drumstick 631 to rotate. The gear shifting drumstick 631 is provided with multiple gear shifting drive slots 6311, and the guide pins at the upper ends of the elastic shift fork mechanism 61 and the retraction member 62 are respectively movably disposed within the gear shifting drive slots 6311. Specifically, the drumstick drive mechanism can use a cable mechanism or a motor mechanism to drive the gear shifting drumstick 631 to rotate, which can be implemented using existing mechanisms, and therefore will not be described in detail.

[0032] In this embodiment, the ratchet 5 is provided with a neutral positioning hole 52, and the main shaft 1 is provided with an elastic positioning bead structure. When the ratchet 5 is in neutral, the positioning bead of the elastic positioning bead structure is engaged in the neutral positioning hole 52, thereby preventing the ratchet 5 from shaking and shifting, making it more stable and reliable during use. Specifically, the elastic positioning bead structure can adopt an existing spring-assisted positioning bead structure.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A shifting control mechanism capable of load shifting and gear raising, comprising a shifting mechanism (6) and a ratchet (5) slidably mounted on a main shaft (1) and meshing with an M-gear main shaft gear (3); the ratchet (5) is drivenly connected to the shifting mechanism (6); characterized in that: The shifting mechanism (6) includes an elastic shift fork mechanism (61), a retraction member (62), and a shifting drive mechanism (63) for driving the elastic shift fork mechanism (61) and the retraction member (62) to move; When shifting from a low gear to an M gear, the shift drive mechanism (63) drives the elastic shift fork mechanism (61) and the de-shifting component (62) to move from a preset position toward the M gear main shaft gear (3), so that the elastic shift fork mechanism (61) drives the ratchet (5) to mesh with the M gear main shaft gear (3), thereby realizing the gearbox upshifting; When shifting from M gear to a lower gear, the shift drive mechanism (63) drives the elastic shift fork mechanism (61) and the retraction member (62) away from the M gear main shaft gear (3) to a preset position. As the main shaft (1) continues to rotate, the retraction member (62) abuts against the ratchet (5) to disengage the ratchet (5) from the M gear main shaft gear (3). The elastic shift fork mechanism (61) pulls the ratchet (5) back to the preset position, thus disengaging the gearbox from downshift.

2. The shifting control mechanism capable of load shifting and upgrading gears according to claim 1, characterized in that: The ratchet (5) is provided with a retraction protrusion (51) that protrudes axially, and the retraction member (62) is located on one side of the retraction protrusion (51); When shifting from M gear to a lower gear, the retraction part (62) abuts against the retraction protrusion (51) of the ratchet (5), causing the ratchet (5) to disengage from the M gear main shaft gear (3).

3. The shifting control mechanism capable of load shifting and upgrading gears according to claim 2, characterized in that: There are two retraction protrusions (51), which are located on both sides of the ratchet (5), and the retraction member (62) is located between the two retraction protrusions (51).

4. The shifting control mechanism capable of load shifting and upgrading gears according to claim 1, characterized in that: The shifting mechanism (6) is provided with a shifting guide rod (64), and the elastic shift fork mechanism (61) and the retraction component (62) are both slidably installed on the shifting guide rod (64).

5. The shifting control mechanism capable of load shifting and upgrading gears according to claim 1, characterized in that: The shift drive mechanism (63) includes a shift drumstick (631) and a drumstick drive mechanism for driving the shift drumstick (631) to rotate. The shift drum (631) is provided with multiple shift drive slots (6311), and the guide pin at the upper end of the elastic shift fork mechanism (61) and the guide pin at the upper end of the retraction component (62) are respectively movably disposed in the shift drive slots (6311).

6. The shifting control mechanism capable of load shifting and upgrading gears according to claim 1, characterized in that: The ratchet (5) is provided with a neutral positioning hole (52), and the spindle (1) is provided with an elastic positioning bead structure. When the ratchet (5) is in neutral, the positioning bead of the elastic positioning bead structure is inserted into the neutral positioning hole (52).

Images