A CVT transmission

Abstract

The present invention discloses a CVT transmission, comprising a driving clutch assembly and a shifting and shifting assembly, and a movable-tooth continuously variable transmission structure of the CVT transmission is formed by a transmission belt, wherein the driving clutch assembly comprises: a driving wheel; a linkage chuck; a clutch chuck, wherein an assembly space with adjustable spacing is formed between the clutch chuck and the linkage chuck and is equipped with a transmission belt, wherein the transmission belt serves as a power transmission component and is used to transmit the circumferential rotation force of the driving wheel to the shifting and shifting assembly; a push turntable, which is arranged below the clutch chuck and has a spiral lifting structure and is capable of converting the circumferential rotation around its own axis into a longitudinal lifting motion, so as to push the clutch chuck to move toward the linkage chuck; a clutch pull rod, wherein one end of the clutch pull rod is hinged to the push turntable and is used to drive the push turntable to rotate circumferentially. The technical solution makes the pushing action more uniform and stable, and avoids the problem of partial disengagement between the clutch chuck and the linkage chuck causing the transmission belt power transmission to be stuck.

Description

Technical Field

[0001] The present invention relates to the technical field of CVT continuously variable transmissions, and in particular to a CVT transmission. Background Art

[0002] Riding lawn mowers generally use a CVT (continuously variable) transmission, which has a drive clutch mechanism inside the transmission with two states: disengaged and engaged, corresponding to the state of the lawn mower moving or standing by. The clutch mechanism generally uses electrical attraction, mechanical push-up, etc. to achieve its clutch state switching, but in actual application, the clutch chuck is prone to partial failure to move into position and engage, causing power transmission jams in the linked parts. Especially after long-term use, it is also prone to noise and component damage. At the same time, for the CVT transmission, the internal movable tooth continuously variable transmission allows the operator to adjust the driving speed by adjusting the depth of the pedal. However, there is a safety hazard if the lawn mower is traveling too fast in reverse gear. There is a need for a CVT transmission that can limit the speed when reversing. Summary of the Invention

[0003] In response to the above problems existing in the prior art, a CVT transmission is provided to avoid the problem of transmission belt power transmission being stuck due to a clutch chuck not being partially moved into engagement, so as to overcome at least one of the above technical defects.

[0004] The specific technical solutions are as follows:

[0005] A CVT transmission includes a driving clutch assembly and a shifting and shifting assembly, wherein a transmission belt is connected between the driving clutch assembly and the shifting and shifting assembly to form a movable-tooth continuously variable transmission structure of the CVT transmission. The driving clutch assembly includes:

[0006] The driving wheel serves as the external power input end;

[0007] The linkage chuck is arranged below the driving wheel and is coaxially connected to the driving wheel;

[0008] The clutch chuck is longitudinally movable and arranged below the linkage chuck. An assembly space with adjustable spacing is formed between the clutch chuck and the linkage chuck and is equipped with a transmission belt. The transmission belt serves as a power transmission component to transmit the circumferential rotation force of the driving wheel to the shift and gear assembly.

[0009] The push turntable is arranged below the clutch chuck and has a spiral lifting structure, which can convert the circumferential rotation around its own axis into longitudinal lifting motion to push the clutch chuck toward the linkage chuck.

[0010] The clutch pull rod has one end hinged to the push turntable to drive the push turntable to rotate in a circumferential direction.

[0011] Preferably, one end of the clutch pull rod away from the pushing turntable is hinged with a linkage rotating plate, and the linkage rotating plate drives the clutch pull rod to move to drive the pushing turntable to rotate circumferentially.

[0012] Preferably, it also includes a reversing and gear shifting component, which has a rotating block, and a stroke limiting structure is formed between the rotating block and the linkage rotating plate. The stroke limiting structure is used to limit the maximum stroke of the linkage rotating plate rotating in the direction of the rotating block, and the maximum stroke is adjustable.

[0013] Preferably, the shifting and shifting assembly includes:

[0014] The driven wheel assembly includes an upper wheel disc and a lower wheel disc that are coaxially connected. The distance between the upper wheel disc and the lower wheel disc is adjustable and the upper wheel disc and the lower wheel disc are connected to the transmission belt. The lower end of the driven wheel assembly has a linkage gear.

[0015] The gear sleeve includes two reversing gears that are coaxially connected and arranged facing each other, and is located below the driven wheel assembly;

[0016] A paddle, one end of which is connected to the gear sleeve, and is used to drive the gear sleeve to move axially to switch the meshing state of the two reversing gears and the linkage gear to adjust the rotation direction of the gear sleeve;

[0017] The rotating block is connected to the paddle through a connecting rod to drive the paddle to move along the axis of the gear sleeve;

[0018] In addition, the linkage chuck, the clutch chuck, the upper wheel disc, the lower wheel disc and the transmission belt together constitute a movable tooth continuously variable speed change structure.

[0019] Preferably, the rotating block and the linkage rotating plate are arranged adjacent to each other, the linkage rotating plate has a groove on one side facing the rotating block, and a block matching the shape of the groove is formed on the side of the rotating block facing the linkage rotating plate, and the groove and the block together constitute a travel limit structure;

[0020] Moreover, when the gear sleeve is in the reverse state, the block can abut against the groove to limit the maximum travel of the clutch chuck towards the linkage chuck, thereby limiting the maximum speed of the vehicle when in reverse gear.

[0021] Preferably, a base is provided below the pushing turntable, and two arc-shaped grooves with a larger upper portion and a smaller lower portion are formed on the outer wall of the base. The pushing turntable has a longitudinal channel, and the inner wall of the longitudinal channel has two arc-shaped concave surfaces matching the shape of the arc-shaped grooves. At least a portion of the pushing turntable is sleeved on the outside of the base, and the arc-shaped concave surfaces fit the arc-shaped grooves. Moreover, when the pushing turntable rotates and rises, the arc-shaped concave surfaces spirally rise along the arc surface of the arc-shaped groove.

[0022] Preferably, a spring is provided between the base and the pushing turntable. The spring is sleeved on the outer periphery of the pushing turntable and has two ends hooked to the pushing turntable and the base, so as to serve as a reset member for the pushing turntable.

[0023] The beneficial effects of the above technical solution are:

[0024] (1) The CVT transmission includes a driving clutch assembly and a shifting assembly. The driving clutch assembly includes a driving wheel, a linkage chuck, a clutch chuck, a push turntable, and a clutch pull rod. The clutch separation and engagement functions are realized between the linkage chuck and the clutch chuck. The push turntable is arranged below the clutch chuck and has a spiral lifting structure. It can convert its own circumferential rotation into the longitudinal lifting movement of the push clutch chuck. The upper surface of the push turntable rotates to lift the lower surface of the push clutch chuck, making the pushing action more uniform and stable, avoiding the problem of partial disengagement between the clutch chuck and the linkage chuck, which causes the transmission belt power transmission to be stuck.

[0025] (2) When the gear sleeve is in the reverse state, the block can abut against the groove to limit the maximum travel of the clutch chuck in the direction of the linkage chuck, thereby limiting the maximum driving speed of the vehicle when it is in the reverse gear, ensuring that the vehicle can travel forward at the maximum speed and limiting the maximum speed of the reverse gear, effectively improving the driving safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective view of the drive clutch assembly and the shift and shift assembly in the CVT transmission of the present invention;

[0027] Figure 2 A perspective view of the drive clutch assembly and the shift and shift assembly in the CVT transmission of the present invention from another perspective;

[0028] Figure 3 A top view of the drive clutch assembly and the shift and shift assembly in the CVT transmission of the present invention;

[0029] Figure 4 A partial exploded view of a lifting member of a driving clutch assembly in a CVT transmission of the present invention;

[0030] Figure 5 A partial exploded view of the lifting member of the driving clutch assembly in the CVT transmission of the present invention from another perspective;

[0031] Figure 6 A perspective view of a shifting and shifting assembly in a driving clutch assembly in a CVT transmission of the present invention;

[0032] Figure 7 It is a top view of the shifting and shifting assembly in the driving clutch assembly in the CVT transmission of the present invention. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is described in detail in the following embodiments with reference to the accompanying drawings.

[0034] See Figures 1 to 7 As shown in , the CVT transmission provided in this embodiment includes a driving clutch assembly and a shifting and shifting assembly, and a transmission belt 6 is connected between the driving clutch assembly and the shifting and shifting assembly to form a CVT transmission's movable tooth continuously variable transmission structure, wherein the driving clutch assembly includes:

[0035] Driving wheel 1, serving as the external power input end;

[0036] The linkage chuck 7 is arranged below the driving wheel 1 and is coaxially connected to the driving wheel 1;

[0037] The clutch chuck 2 is longitudinally movable and arranged below the linkage chuck 7. An assembly space with adjustable spacing is formed between the clutch chuck 2 and the linkage chuck 7, and a transmission belt 6 is installed. The transmission belt 6 serves as a power transmission member for transmitting the circumferential rotation force of the driving wheel 1 to the reversing and shifting assembly.

[0038] The push turntable 3 is arranged below the clutch chuck 2 and has a spiral lifting structure that can convert the circumferential rotation around its own axis into a longitudinal lifting motion to push the clutch chuck 2 toward the linkage chuck 7;

[0039] The clutch pull rod 4 has one end hinged to the push turntable 3 to drive the push turntable 3 to rotate circumferentially.

[0040] Based on the above technical solution, the CVT transmission includes a driving clutch assembly and a reversing and shifting assembly. The driving clutch assembly includes a driving wheel 1, a linkage chuck 7, a clutch chuck 2, a pushing turntable 3, and a clutch pull rod 4. The clutch separation and engagement functions are realized between the linkage chuck 7 and the clutch chuck 2. The pushing turntable 3 is arranged below the clutch chuck 2 and has a spiral lifting structure, which can convert its own circumferential rotation into a longitudinal lifting movement of the pushing clutch chuck 2. The upper surface of the pushing turntable 3 rotates to push the lower surface of the clutch chuck 2 to lift it, making the pushing action more uniform and stable, avoiding the problem of partial disengagement between the clutch chuck 2 and the linkage chuck 7, which causes the power transmission of the transmission belt 6 to be stuck.

[0041] In a preferred embodiment, specifically as Figures 1 to 3As shown in the figure, the end of the clutch rod 4 away from the push turntable 3 is hinged with a linkage turntable 5, and the linkage turntable 5 drives the clutch rod 4 to move to drive the push turntable 3 to rotate circumferentially; the CVT transmission also includes a reversing and shifting component, which has a rotating block 12, and a stroke limiting structure is formed between the rotating block 12 and the linkage turntable 5. The stroke limiting structure is used to limit the maximum stroke of the linkage turntable 5 rotating in the direction of the rotating block 12, and the maximum stroke is adjustable.

[0042] As a further preferred embodiment, the shifting and shifting assembly includes:

[0043] The driven wheel assembly 8 includes an upper wheel disc and a lower wheel disc connected coaxially. The spacing between the upper wheel disc and the lower wheel disc is adjustable and the transmission belt 6 is connected to the driven wheel assembly 8. The lower end of the driven wheel assembly 8 has a linkage gear 15;

[0044] The gear sleeve includes two reversing gears 9 that are coaxially connected and arranged facing each other, and is located below the driven wheel assembly 8;

[0045] The paddle 10 has one end connected to the gear sleeve and is used to drive the gear sleeve to move axially to switch the meshing state of the two reversing gears 9 and the linkage gear 15 and adjust the rotation direction of the gear sleeve, including forward, reverse and no rotation;

[0046] The rotating block 12 is connected to the paddle 10 through the connecting rod 11, so as to drive the paddle 10 to move along the axis of the gear sleeve;

[0047] In addition, the linkage chuck 7, the clutch chuck 2, the upper wheel disc, the lower wheel disc and the transmission belt 6 together constitute a movable tooth continuously variable speed change structure.

[0048] It is worth noting that, in this embodiment, the forward rotation, reverse rotation and non-rotation states of the gear sleeve are limited to the forward gear, reverse gear and neutral gear of the CVT transmission applied to the vehicle, but are not limited thereto.

[0049] In specific applications, combined Figure 3As shown in FIG, the operator rotates the linkage plate 5 by stepping on the pedal, and the clutch pull rod 4 drives the push plate 3 to spiral upward, pushing the clutch chuck 2 and the linkage chuck 7 to achieve the purpose of engagement. The clutch chuck 2 and the linkage chuck 7 form a structure for driving the transmission belt 6. The upper and lower wheels of the driven pulley assembly 8 can be raised and lowered longitudinally. The linkage chuck 7, clutch chuck 2, upper and lower wheels, and the transmission belt 6 together constitute a movable tooth continuously variable transmission structure. At the same time, the operator manually pushes and pulls the shift rocker to drive the rotating block 12 to rotate about its own hinge point. Then, through the connecting rod 11 and the paddle 10, the two reversing gears 9 of the gear sleeve switch their meshing state with the linkage gear 15 to adjust the rotation direction of the gear sleeve, thereby switching the rotation direction of the CVT transmission output, including the aforementioned forward, reverse, and no rotation states, so that the corresponding vehicle is in the forward gear, reverse gear, and neutral gear states.

[0050] As a further preferred embodiment, Figure 3 As shown in the figure, the rotating block 12 is arranged adjacent to the linkage rotating plate 5, and the side of the linkage rotating plate 5 facing the rotating block 12 has a groove 14, and the side of the rotating block 12 facing the linkage rotating plate 5 is protruded with a block 13 that matches the shape of the groove 14, and the groove 14 and the block 13 together constitute the above-mentioned stroke limiting structure, and when the gear sleeve is in the reverse state, the block 13 can abut against the groove 14 to limit the maximum stroke of the clutch chuck 2 moving towards the linkage chuck 7, thereby limiting the maximum driving speed of the vehicle when it is in reverse gear.

[0051] In specific applications, the CVT transmission provided in this embodiment is mainly used in riding lawn mowers. When the vehicle is in reverse gear, the maximum stroke of the operator's pedal is limited by the stroke limit structure, that is, the maximum stroke is the position where the block 13 is pressed into the groove 14. In the forward gear and neutral gear, the rotating block 12 rotates in the direction away from the linkage rotating plate 5, so that even if the pedal is stepped on to the deepest position, the block 13 cannot be pressed into the groove 14. That is, the rotating block 12 has no effect on the vehicle's forward gear, ensuring that the vehicle can travel forward at the maximum speed and limiting the maximum speed of the reverse gear, effectively improving the vehicle's driving safety.

[0052] In a preferred embodiment, combined Figure 4 and Figure 5As shown in FIG, a base 18 is positioned below the push-up turntable 3. Two arcuate grooves 19 are formed on the outer wall of the base 18, with the upper portion being larger than the lower portion. The push-up turntable 3 has a longitudinal channel, and the inner wall of the longitudinal channel has two arcuate concave surfaces 16 that match the shape of the arcuate grooves 19. At least a portion of the push-up turntable 3 is sheathed around the base 18, with the arcuate concave surfaces 16 fitting closely with the arcuate grooves 19. As the push-up turntable 3 rotates and ascends, the arcuate concave surfaces 16 spiral upward along the arcuate surfaces of the arcuate grooves 19, making the entire spiral lifting action more stable and reliable. Furthermore, a spring 17 is positioned between the base 18 and the push-up turntable 3. The spring 17 is sheathed around the outer circumference of the push-up turntable 3, with its ends hooked to the push-up turntable 3 and the base 18, serving as a reset member for the push-up turntable 3. In practice, the spring's ends are hooked to the push-up turntable 3 and the base 18, respectively, providing a helical tension force to reset the push-up turntable 3. Obviously, the push-disc 3 can also be reset by its own weight or the reverse push of the linkage pull rod 4. The spring can also be implemented by other elastic members or is not required. Simultaneously, the clutch chuck 2 can move away from the linkage chuck under the tension of the transmission belt 6 and its own weight, i.e., reset downward until the transmission belt is no longer powered. In other words, when the operator releases the pedal, the spring forces the push-disc, pull rod, and linkage turntable to reset, and the clutch chuck also resets. Obviously, a tensioning structure can be added between the clutch chuck and the push-disc, and the present invention is not limited to this embodiment.

[0053] In addition, the base 18 has a through hole and is embedded with a bearing. The driving wheel 1, the linkage chuck 7, the clutch chuck 2, the push turntable 3 and the base 18 are coaxial. The central shaft has a circumferentially arranged longitudinal gear tooth structure, and the driving wheel 1 is fixed to the shaft. The linkage chuck 7 and the clutch chuck 2 both have through holes with internal tooth grooves matching the longitudinal gear tooth structure and can be assembled on the central shaft in a longitudinally movable manner so that the distance between the two is adjustable, and the push turntable 3 has a longitudinal channel for passing through the central shaft to constitute the above-mentioned drive clutch assembly.

[0054] The above description is merely a preferred embodiment of the present invention and is intended to be illustrative rather than restrictive of the present invention. Those skilled in the art will appreciate that many changes, modifications, and even equivalents may be made to the present invention within the spirit and scope of the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A CVT transmission, comprising a driving clutch assembly and a shifting and shifting assembly, wherein the driving clutch assembly and the shifting and shifting assembly are connected by a transmission belt (6) to form a CVT transmission with a movable tooth continuously variable transmission structure, characterized in that: The driving clutch assembly comprises: A driving wheel (1) serving as an external power input terminal; A linkage chuck (7) is arranged below the driving wheel (1) and is coaxially connected to the driving wheel (1); A clutch chuck (2) is longitudinally movable and arranged below the linkage chuck (7). An assembly space with adjustable spacing is formed between the clutch chuck (2) and the linkage chuck (7) and is equipped with the transmission belt (6). The transmission belt (6) serves as a power transmission component for transmitting the circumferential rotation force of the driving wheel (1) to the shifting and shifting assembly. A push turntable (3) is arranged below the clutch chuck (2), and the push turntable (3) has a spiral lifting structure, which can convert the circumferential rotation around its own axis into a longitudinal lifting motion, so as to push the clutch chuck (2) to move in the direction of the linkage chuck (7); A clutch pull rod (4) has one end hinged to the push turntable (3) for driving the push turntable (3) to rotate in a circumferential direction; One end of the clutch pull rod (4) facing away from the pushing turntable (3) is hinged with a linkage rotating plate (5), and the linkage rotating plate (5) drives the clutch pull rod (4) to move so as to drive the pushing turntable (3) to rotate circumferentially; The invention also includes a shifting and shifting assembly, wherein the shifting and shifting assembly has a rotating block (12), and a stroke limiting structure is formed between the rotating block (12) and the linkage rotating plate (5), wherein the stroke limiting structure is used to limit the maximum stroke of the linkage rotating plate (5) rotating in the direction of the rotating block (12), and the maximum stroke is adjustable; The shifting and shifting assembly comprises: A driven wheel assembly (8) comprises an upper wheel disc and a lower wheel disc connected coaxially, wherein the spacing between the upper wheel disc and the lower wheel disc is adjustable and the upper wheel disc and the lower wheel disc are connected to the transmission belt (6); a linkage gear (15) is provided at the lower end of the driven wheel assembly (8); The gear sleeve comprises two reversing gears (9) which are coaxially connected and arranged facing each other, and is located below the driven wheel assembly (8); A paddle (10), one end of which is connected to the gear sleeve, and is used to drive the gear sleeve to move axially to switch the meshing state of the two reversing gears (9) and the linkage gear (15) to adjust the rotation direction of the gear sleeve; The rotating block (12) is connected to the paddle (10) via a connecting rod (11) to drive the paddle (10) to move along the axis of the gear sleeve; Furthermore, the movable-tooth stepless speed change structure is formed by the linkage chuck (7), the clutch chuck (2), the upper wheel disc, the lower wheel disc and the transmission belt (6); The rotating block (12) is arranged adjacent to the linkage rotating plate (5); a groove (14) is provided on the side of the linkage rotating plate (5) facing the rotating block (12); a block (13) having a shape matching that of the groove (14) is formed on the side of the rotating block (12) facing the linkage rotating plate (5); and the groove (14) and the block (13) together constitute the travel limiting structure; Furthermore, when the gear sleeve is in a reverse state, the block (13) can abut against the groove (14) to limit the maximum travel of the clutch chuck (2) in the direction of the linkage chuck (7), thereby limiting the maximum travel speed of the vehicle when it is in reverse gear.

2. The CVT transmission according to claim 1, wherein: A base (18) is further provided below the pushing turntable (3), and two arc-shaped grooves (19) with a larger upper portion and a smaller lower portion are formed on the outer wall of the base (18). The pushing turntable (3) has a longitudinal channel, and the inner wall of the longitudinal channel has two arc-shaped concave surfaces (16) that match the shape of the arc-shaped grooves (19). At least a portion of the pushing turntable (3) is sleeved on the outside of the base (18), and the arc-shaped concave surfaces (16) are in contact with the arc-shaped grooves (19). Moreover, when the pushing turntable (3) rotates and rises, the arc-shaped concave surfaces (16) rise in a spiral along the arc surface of the arc-shaped grooves (19).

3. The CVT transmission according to claim 2, wherein: A spring (17) is further provided between the base (18) and the pushing turntable (3). The spring (17) is sleeved on the outer periphery of the pushing turntable (3) and has two ends connected to the pushing turntable (3) and the base (18), so as to serve as a reset component for the pushing turntable (3).

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