Planetary gear mechanical stepless variable speed drive axle

Abstract

The present application relates to the technical field of drive, specifically to a kind of planetary gear mechanical stepless variable speed drive axle, including shell, planetary gear box, output shaft, first hydraulic tank, rear variable diameter pulley and steel band, it further includes input shaft, second hydraulic tank, front variable diameter pulley, pressure regulating assembly, pusher, resistance component and mounting block, the input shaft is connected with planetary gear box output end, the second hydraulic tank is connected with input shaft, the front variable diameter pulley is connected with input shaft, the pressure regulating assembly is connected with front variable diameter pulley, the pusher is connected with pressure regulating assembly, the resistance component is connected with pressure regulating assembly, the mounting block is connected with resistance component, the steel band is connected in front variable diameter pulley surface and rear variable diameter pulley surface, the present application is by adjusting the pressure to steel band, and then the purpose of improving front variable diameter pulley and steel band transmission stability is achieved.

Description

Technical Field

[0001] This invention relates to the field of drive technology, specifically to a planetary gear mechanical continuously variable transmission drive axle. Background Technology

[0002] The planetary gear mechanical continuously variable transmission drive axle is a continuously variable transmission drive system that connects planetary gears. It achieves forward and reverse rotation of the continuously variable transmission drive system by clamping the sun gear, planet carrier, and external gear ring of the planetary gears respectively.

[0003] The continuously variable transmission (CVT) system works by controlling the distance between the two ends of the front and rear variable diameter pulleys via a hydraulic system. The distance between the front and rear variable diameter pulleys changes inversely. A steel belt connects to the surfaces of the front and rear variable diameter pulleys. Changes in the distance between these pulleys cause inversely proportional changes in the rotational diameter of the steel belt's ends, thus achieving continuously variable speed. The front variable diameter pulley is connected to the power output end of the planetary gears. Therefore, the stability of the transmission between the front variable diameter pulley and the steel belt determines the overall stability of the gear transmission system. Since the front variable diameter pulley is relatively stationary with the steel belt when driving it, wear on the steel belt is minimal. The diameter of the steel belt is relatively small; however, the rotation diameter of the steel belt is adjusted by the squeezing force of the front variable diameter pulley on the steel belt. Therefore, when it is necessary to quickly increase the transmission ratio, the gap between the front variable diameter pulleys narrows and squeezes the steel belt, causing the steel belt to expand on the surface of the front variable diameter pulley. The squeezing force generated during the squeezing process will aggravate the wear of the steel belt, which will lead to a decrease in the fit between the steel belt and the front variable diameter pulley, resulting in slippage during use. When the transmission ratio is quickly reduced, the front drive pulley needs to be separated, which will cause the steel belt to lose the squeezing force from the front drive pulley. At this time, the friction between the two when the front drive pulley drives the steel belt to rotate is reduced, which can easily cause the steel belt to slip during the rotation process.

[0004] To address the issue that the magnitude of the front drive pulley's compressive force affects the efficiency of the steel belt drive, existing technologies offer several solutions. For example, the continuously variable transmission (CVT) with publication number CN104595442B reduces the probability of slippage by increasing the contact area between the belt and the drive pulley. While this reduces slippage during transmission, the increased friction further exacerbates wear between the steel belt and the drive pulley, leading to reduced fit and consequently affecting service life.

[0005] To address this, a planetary gear mechanical continuously variable transmission drive axle is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a planetary gear mechanical continuously variable transmission drive axle, which solves the problem that the magnitude of the extrusion pressure of the front variable diameter pulley on the steel belt affects the transmission efficiency of the steel belt. By adjusting the pressure on the steel belt during the diameter change process, the transmission stability is improved.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A planetary gear mechanical continuously variable transmission drive axle includes a housing, a planetary gearbox, an output shaft, a first hydraulic tank, a rear variable-diameter pulley, and a steel belt. The planetary gearbox is connected to the housing, the output shaft is connected to the housing, the first hydraulic tank is connected to the output shaft, and the rear variable-diameter pulley is connected to the output shaft. It also includes an input shaft, a second hydraulic tank, a front variable-diameter pulley, a pressure adjusting component, a pusher, a resistance component, and a mounting block. The input shaft is connected to the output end of the planetary gearbox, the second hydraulic tank is connected to the input shaft, the front variable-diameter pulley is connected to the input shaft, the pressure adjusting component is connected to the front variable-diameter pulley, the pusher is connected to the pressure adjusting component, the resistance component is connected to the pressure adjusting component, and the mounting block is connected to the resistance component. The steel belt connects to the surfaces of the front and rear variable-diameter pulleys. When the front variable-diameter pulley changes diameter, the resistance component limits the pressure adjusting component. The pressure adjusting component slides within the front variable-diameter pulley to adjust the pressure on the steel belt. The pusher pushes the pressure adjusting component to reset within the variable-diameter pulley.

[0009] The above solution allows for adjustment of the pressure on the steel belt by the pressure regulating component, thereby achieving the purpose of adjusting the pressure on the steel belt according to the diameter change direction of the front variable diameter pulley, effectively preventing slippage between the front variable diameter pulley and the steel belt.

[0010] Preferably, the front variable diameter pulley includes a fixed pulley, a movable pulley, and slots. Both the fixed pulley and the movable pulley are connected to the input shaft. The movable pulley is connected to the power output end of the second hydraulic box. The facing surfaces of the fixed pulley and the movable pulley are conical. Multiple slots are formed at equal angles along the central axis of the input shaft on the surfaces of the fixed pulley and the movable pulley. Thus, the rotation diameter of the steel belt on the surfaces of the fixed pulley and the movable pulley can be controlled by the distance between them, thereby achieving the purpose of controlling the transmission amount.

[0011] Preferably, the longitudinal section of the slot is an isosceles trapezoid with the short side facing the input shaft, and the two sides of the slot are chamfered.

[0012] Through the above scheme, the fixed pulley and the movable pulley will cause the steel belt to gradually increase in diameter during the extrusion process. The chamfering design reduces the wear between the steel belt and the groove edge during the compression and diffusion process. At the same time, the shape of the groove allows the steel belt to gradually separate from the groove during the expansion process, thereby reducing the wear on the steel belt edge. On the other hand, it can increase the resistance during the shrinkage process of the steel belt, thus adapting to the shape change of the steel belt. Meanwhile, the existence of resistance effectively ensures the stability of the transmission between the steel belt and the fixed pulley and the movable pulley.

[0013] Preferably, the pressure regulating assembly includes a fixed block, a sliding plate, and a movable component. The multiple fixed blocks are respectively connected to the opposite surfaces of the fixed pulley and the movable pulley. The sliding plate is slidably connected to the fixed block. The longitudinal cross-section of the fixed block is trapezoidal. The sliding plate is connected to the movable component.

[0014] The above scheme facilitates the movement of the movable part. By setting the cross-section of the fixed block into a trapezoidal shape, the friction between the slide and the fixed block is reduced during the rotation of the slide, thus facilitating the sliding of the slide.

[0015] Preferably, the movable component includes a connecting block, a movable block, and a protrusion. The connecting block is connected to the slide plate, the movable block is connected to the connecting block, the protrusion is connected to the movable block, the movable block slides in the slot, and there is a gap between the opposing surfaces of the movable blocks on both sides and the opposing surfaces of the fixed pulley and the movable pulley.

[0016] The above method allows for adjustment of the position of the convex strip, thereby controlling the contact area between the steel belt and the front variable diameter pulley during rotation. The gap between the movable block and the front variable diameter pulley further reduces the contact area between the steel belt and the front variable diameter pulley.

[0017] Preferably, the longitudinal cross-section of the protrusion is an isosceles trapezoid with the short side facing outward, and the protrusion is centrally located on the surface of the movable block.

[0018] The above scheme can increase the friction area between the steel strip and the steel strip during the shrinkage process, and at the same time increase the squeezing force on the steel strip through the convex strip, thereby increasing the pressure on the steel strip during shrinkage and achieving the purpose of balancing the front and rear squeezing forces of the steel strip.

[0019] Preferably, the pushing component includes a spring plate and a limiting block, the spring plate is connected to the slide plate, the limiting block is connected to both ends of the spring plate, and the spring plate is V-shaped.

[0020] The above scheme generates a driving force on the slide plate, effectively ensuring the fit between the slide plate and the front variable diameter pulley. At the same time, the structural design of the spring plate allows the centrifugal force generated during rotation to further enhance the driving force on the slide plate. Meanwhile, the limiting blocks are connected to both ends of the spring plate, thus achieving a good limiting effect on the spring plate.

[0021] Preferably, the resistance assembly includes a connecting frame, a connecting plate, a reduction gear ring, and a retainer. The connecting frame is connected to the slide block, the connecting plate is connected to the connecting frame, the reduction gear ring is connected to the connecting plate, and the retainer is connected to the reduction gear ring. The longitudinal section of the connecting plate is semi-circular, and the connecting frame is connected to the housing via a mounting block. Therefore, the circular longitudinal section of the connecting frame reduces interference with the slide block's rotation trajectory during rotation, thus improving the stability of the slide block's rotation.

[0022] Preferably, the deceleration rubber ring includes a connecting section, a deformation section, an adhesion section, and a cavity. The connecting section is connected to a connecting plate, the deformation section is connected to the connecting section, the adhesion section is connected to the connecting section, and the connecting section, deformation section, and adhesion section form a cavity.

[0023] The above solution can increase the friction between the card holder and the card holder when the card holder moves quickly. By increasing the contact area between the adhesion section and the card holder when moving quickly, the moving speed of the sliding plates on both sides is slowed down, and the cavity facilitates the deformation of the deformation section.

[0024] Preferably, the card holder includes a card plate and a wedge plate, the card plate being slidably connected to the housing, and the contact surface between the wedge plate and the adhesion section being an inclined surface.

[0025] Through the above scheme, the inclined plane can gradually increase the resistance between the wedge plate and the adhesion section, thereby reducing the problem of large friction between the fixed block connected to the second hydraulic cylinder and the slide plate, which leads to a large thrust of the slide plate, and thus achieving the purpose of good support effect for the slide plates on both sides.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. This invention solves the problem that the magnitude of the extrusion pressure of the front variable diameter pulley on the steel belt affects the transmission efficiency of the steel belt. By setting a front variable diameter pulley and opening a trapezoidal groove on the surface of the front variable diameter pulley, the contact area with the front variable diameter pulley can be increased or decreased during the radial movement of the steel belt, thereby ensuring the transmission effect of the steel belt with the front variable diameter pulley.

[0028] 2. By setting a pressure regulating component, the pressure on the sidewall of the steel belt is controlled. When the diameter of the steel belt expands during rotation, the pressure on the steel belt is reduced, thus avoiding excessive wear on the sidewall of the steel belt caused by excessive pressure. When the diameter of the steel belt decreases, the pressure between the component and the steel belt is increased, thereby improving the rotational stability of the steel belt. By setting different states of the pressure regulating component for different radial movement directions of the steel belt, the stability of the steel belt transmission efficiency is effectively guaranteed.

[0029] 3. By setting up a resistance component, different pressure states are generated for the radial movement of the steel belt in different directions. By making the axial diameter change speed of the resistance component less than the axial diameter change speed of the front variable diameter pulley, support forces are generated in different directions for the pressure regulating component, thereby effectively ensuring the adjustment effect of the pressure regulating component on the steel belt, and further ensuring the stability of the steel belt transmission efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the variable diameter pulley section of the present invention;

[0032] Figure 3 This is a schematic diagram of the slot portion of the present invention;

[0033] Figure 4 This is a schematic diagram of the voltage regulating component of the present invention;

[0034] Figure 5 This is a structural schematic diagram of the invention from a rear-view perspective;

[0035] Figure 6 This is a schematic diagram of the structure of the resistance component of the present invention;

[0036] Figure 7 For the present invention Figure 6 Enlarged view of point A;

[0037] Figure 8 This is a schematic diagram of the structure after the spacing between the variable diameter pulleys of the present invention has been reduced.

[0038] In the diagram: 1. Housing; 2. Planetary gearbox; 3. Output shaft; 4. First hydraulic tank; 5. Rear variable diameter pulley; 6. Steel belt; 7. Input shaft; 8. Second hydraulic tank; 9. Front variable diameter pulley; 901. Fixed pulley; 902. Movable pulley; 903. Groove; 10. Pressure regulating assembly; 1001. Fixed block; 1002. Slide plate; 1003. Moving part; 10031. Connecting block; 10032. Movable part Block; 10033, protruding strip; 11, pushing component; 1101, spring plate; 1102, limiting block; 12, resistance component; 1201, connecting frame; 1202, connecting plate; 1203, deceleration rubber ring; 12031, connecting section; 12032, deformation section; 12033, adhesion section; 12034, cavity; 1204, card holder; 12041, card plate; 12042, wedge plate; 13, mounting block. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, so as to provide a more detailed description of their working state and structural features. Obviously, the described embodiments are only some embodiments of the present invention and not complete embodiments. Based on the embodiments of the present invention, other embodiments obtained by those of ordinary skill in the art without creative effort are all within the protection scope of the present invention.

[0040] Please see Figures 1 to 8 This invention provides a planetary gear mechanical continuously variable transmission drive axle, the technical solution of which is as follows:

[0041] For details, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 8A planetary gear mechanical continuously variable transmission drive axle includes a housing 1, a planetary gearbox 2, an output shaft 3, a first hydraulic tank 4, a rear variable diameter pulley 5, and a steel belt 6. The planetary gearbox 2 is connected to the housing 1, and the output shaft 3 is also connected to the housing 1, with the output shaft 3 located at the rear of the planetary gearbox 2. The surface of the output shaft 3 is connected to the first hydraulic tank 4 and the rear variable diameter pulley 5, which is connected to the first hydraulic tank 4 (the rear variable diameter pulley 5 is divided into two sections; one section is fixed to the output shaft 3, and the other section is movably engaged with the output shaft 3 and connected to the power output end of the first hydraulic tank 4. Driven by the power of the first hydraulic tank 4, the other section of the rear variable diameter pulley 5 slides on the surface of the output shaft 3, and the facing surfaces of the two sections of the rear variable diameter pulley 5 are conical). It also includes an input shaft 7, a second hydraulic tank 8, a front variable diameter pulley 9, and a pressure regulating assembly 10. The system comprises a pusher 11, a resistance assembly 12, and a mounting block 13. The input shaft 7 is connected to the output end of the planetary gearbox 2. The second hydraulic tank 8 is connected to the input shaft 7 and is located at the right end of the input shaft 7. The front variable diameter pulley 9 is connected to the input shaft 7. The pressure regulating assembly 10 is connected to the front variable diameter pulley 9. The pusher 11 is connected to the pressure regulating assembly 10. The resistance assembly 12 is connected to the pressure regulating assembly 10. The mounting block 13 is connected to the resistance assembly 12. The side of the mounting block 13 away from the resistance assembly 12 is connected to the housing 1. The steel belt 6 is connected to the surface of the front variable diameter pulley 9 and the surface of the rear variable diameter pulley 5. When the front variable diameter pulley 9 changes diameter, the resistance assembly 12 limits the pressure regulating assembly 10. The pressure regulating assembly 10 slides in the front variable diameter pulley 9 to adjust the pressure on the steel belt 6. The pusher 11 pushes the pressure regulating assembly 10 to reset in the front variable diameter pulley 9.

[0042] The front variable diameter pulley 9 includes a fixed pulley 901, a movable pulley 902, and slots 903. Both the fixed pulley 901 and the movable pulley 902 are connected to the input shaft 7. The fixed pulley 901 is fixedly connected to the input shaft 7, while the movable pulley 902 is slidably connected to the input shaft 7 along its axis. The movable pulley 902 is connected to the power output end of the second hydraulic box 8. The second hydraulic box 8 drives the movable pulley 902 to slide on the surface of the input shaft 7. The facing surfaces of the fixed pulley 901 and the movable pulley 902 are conical. The side of the steel belt 6 contacts the conical surfaces of the fixed pulley 901 and the movable pulley 902. Multiple slots 903 are equally spaced along the central axis of the input shaft 7 on the surfaces of the fixed pulley 901 and the movable pulley 902. The longitudinal section of the slot 903 is an isosceles trapezoid with its short side facing the input shaft 7. The slots 903 are slidably formed when the fixed pulley 901 and the movable pulley 902 drive the steel belt 6 to slide on the surface of the input shaft 7. When belt 6 rotates, the steel belt 6 remains relatively stationary with respect to the fixed pulley 901 and the movable pulley 902. The steel belt 6 makes inclined contact with the groove 903, thereby increasing the resistance of the fixed pulley 901 and the movable pulley 902 when driving the steel belt 6 to move circumferentially. During pitch change, friction occurs between the steel belt 6 and the fixed pulley 901 and the movable pulley 902. Through the trapezoidal groove 903 with the smaller end pointing downwards, the edge of the steel belt 6 gradually separates from the groove 903 when it expands, thereby reducing the friction between the steel belt 6 and the edge of the groove 903. This facilitates the movement of the steel belt 6 on the surfaces of the fixed pulley 901 and the movable pulley 902. When the steel belt 6 contracts, the edge of the steel belt 6 contacts the groove 903, thereby increasing the friction between the steel belt 6 and the groove 903 and improving the stability of the steel belt 6 during contraction. The groove 903 has chamfers on both sides to facilitate the sliding of the steel belt 6.

[0043] It should be noted that the steel strip 6 is composed of multiple thrust blocks stacked together, and the thrust blocks are connected by ring assemblies.

[0044] By setting a front variable diameter pulley 9, the steel belt 6 is subjected to resistance in different directions when the diameter of the front variable diameter pulley 9 changes. By setting a slot 903, when the steel belt 6 expands, the contact between the edge of the steel belt 6 and the slot 903 gradually widens. As the steel belt 6 moves, the edge of the steel belt 6 gradually moves to the slot 903, and the resistance between the steel belt 6 and the slot 903 gradually decreases. At the same time, the trapezoidal shape of the slot 903 slows down the speed at which the contact area between the steel belt 6 and the fixed pulley 901 and the movable pulley 902 increases, thereby reducing friction. When the steel belt 6 contracts, the edge of the steel belt 6 rubs against the edge of the slot 903, thereby increasing the resistance when the steel belt 6 contracts and improving the stability of the steel belt 6 during transmission.

[0045] As one embodiment of the present invention, refer to Figure 4 , Figure 5 and Figure 8The pressure regulating assembly 10 includes a fixed block 1001, a slide 1002, and a movable component 1003. Multiple fixed blocks 1001 are respectively connected to the opposite faces of the fixed pulley 901 and the movable pulley 902. The left fixed block 1001 is connected to the planetary gearbox 2, and the right fixed block 1001 is connected to the second hydraulic box 8. The slide 1002 is slidably connected to the fixed block 1001. The longitudinal section of the fixed block 1001 is trapezoidal. When rotating, the centrifugal force generated by the slide 1002 is directed outward. By making the long side of the trapezoid of the fixed block 1001 face the input shaft 7, the force point of the slide 1002 during rotation is located at the long side of the trapezoid of the fixed block 1001, which reduces the sliding resistance between the side of the slide 1002 and the side of the fixed block 1001, and facilitates the sliding of the slide 1002 with the fixed block 1001 during rotation. The slide 1002 is connected to the movable component 1003.

[0046] The movable component 1003 includes a connecting block 10031, a movable block 10032, and a protruding strip 10033. The connecting block 10031 is connected to the slide plate 1002, the movable block 10032 is connected to the connecting block 10031, and the protruding strip 10033 is connected to the movable block 10032. The movable block 10032 slides in the slot 903. The shape of the movable block 10032 is adapted to and engages with the slot 903. The number of movable blocks 10032 corresponds to the number of slots 903. The facing surfaces of the two movable blocks 10032 are connected to the fixed pulley 901 and the movable belt. A gap exists between the facing surfaces of pulleys 902 and 902. This gap reduces the contact area between the steel belt 6 and both the fixed and movable pulleys 901 and 902, thereby reducing the friction between the variable-diameter pulley 9 and the steel belt 6 during diameter changes. Simultaneously, the edge of the groove 903 contacts the steel belt 6, increasing the resistance between the steel belt 6 and the groove 903 during contraction, thus improving transmission stability. The longitudinal section of the convex strip 10033 is an isosceles trapezoid with its short side facing outwards. The convex strip 10033 is centrally located on the surface of the movable block 10032, further enhancing the resistance of the steel belt 6 during expansion. During the tensioning process, the steel belt 6 rotates from contact with the sidewalls of the fixed pulley 901 and the movable pulley 902 to a state of non-contact (moving from the protrusion 10033 to the gap between the opposing surfaces of the movable block 10032 and the opposing surfaces of the fixed pulley 901 and the movable pulley 902), thereby reducing friction. Simultaneously, during the contraction process, the steel belt 6 changes from non-contact to contact, increasing the resistance to movement at the edge of the steel belt 6 and improving the stability of the steel belt 6 in contact with the sidewalls of the fixed pulley 901 and the movable pulley 902 during rotation. The pushing component 11 includes a spring plate 1. 101 and limiting block 1102, spring plate 1101 is connected to slide 1002, limiting block 1102 is connected to both ends of spring plate 1101, limiting block 1102 limits both ends of spring plate 1101, spring plate 1101 is in the shape of "V", so that spring plate 1101 opens from the side close to input shaft 7 to the side away from input shaft 7. Then, during the rotation of spring plate 1101, under the influence of centrifugal force, the "V" shaped tip of spring plate 1101 is thrown outward, thereby achieving the purpose of increasing the elasticity of spring plate 1101.

[0047] By setting the pressure regulating component 10, when the rotation diameter of the steel belt 6 expands, the protrusion 10033 separates from the steel belt 6, reducing the contact area with the steel belt 6, thereby reducing friction. When the rotation diameter of the steel belt 6 shrinks, the protrusion 10033 squeezes the steel belt 6, thereby increasing the resistance between the steel belt 6 and the fixed pulley 901 and the movable pulley 902, thus improving the stability of the transmission.

[0048] As one embodiment of the present invention, refer to Figure 5 , Figure 6 , Figure 7 and Figure 8The resistance assembly 12 includes a connecting frame 1201, a connecting plate 1202, a deceleration rubber ring 1203, and a clamping bracket 1204. The connecting frame 1201 is fixedly connected to the slide plate 1002 and is connected to the housing 1 via a mounting block 13. The mounting block 13 can slide laterally on the housing 1, thereby allowing the connecting frame 1201 to slide laterally with the housing 1. The connecting plate 1202 is fixedly connected to the connecting frame 1201. The deceleration rubber ring 1203 is connected to the connecting plate 1202 and the clamping bracket 1204. One end of the deceleration rubber ring 1203 away from the connecting frame 1201 extends to the outside of the clamping bracket 1204. The longitudinal section of the connecting plate 1202... The surface is semi-circular. The deceleration rubber ring 1203 includes a connecting section 12031, a deformation section 12032, and an adhesion section 12033. A part of the connecting section 12031 is connected to the connecting plate 1202, and the other part of the connecting section 12031 is suspended. The deformation section 12032 is connected to the connecting section 12031, and the adhesion section 12033 is connected to the connecting section 12031. The connecting section 12031, the deformation section 12032, and the adhesion section 12033 form a cavity 12034. The card holder 1204 includes a card plate 12041 and a wedge plate 12042. The card holder 1204 is slidably connected to the housing 1. The contact surface between the wedge plate 12042 and the adhesion section 12033 is an inclined surface.

[0049] By setting the resistance component 12, when the front variable diameter pulley 9 changes diameter rapidly, the adhesion section 12033 deforms to increase the contact area with the wedge plate 12042, thereby increasing the resistance between the wedge plate 12042 and the deceleration rubber ring 1203. The moving speed of the connecting plates 1202 on both sides is slowed down, thus forming a good support effect, thereby achieving the purpose of controlling the distance between the two sliding plates 1002.

[0050] During transmission, the output power is transmitted to the planetary gearbox 2, which controls the direction of power output. The planetary gearbox 2 drives the front variable diameter pulley 9 to rotate through the input shaft 7. The steel belt 6 is in contact with the front variable diameter pulley 9, and when the front variable diameter pulley 9 rotates, it drives the steel belt 6 to transmit power. The steel belt 6 transmits power to the output shaft 3 through the rear variable diameter pulley 5. When the front variable diameter pulley 9 is transmitting power, it is relatively stationary with the steel belt 6, resulting in less friction.

[0051] When the front variable diameter pulley 9 is rapidly shortened, the second hydraulic cylinder pushes the movable pulley 902 to move laterally on the input shaft 7, thereby reducing the distance between the movable pulley 902 and the fixed pulley 901. The rotation diameter of the steel belt 6 around the movable pulley 902 and the fixed pulley 901 gradually increases. At this time, the steel belt 6 located on the conical surface of the movable pulley 902 and the fixed pulley 901 is subjected to compressive force and moves outward, rubbing against the fixed pulley 901 and the movable pulley 902. Since the side of the slot 903 is an isosceles trapezoid with the short side facing the input shaft 7, the edge of the steel belt 6 moves to the slot 903. At point 3, the steel belt 6 gradually separates from the slot 903. The side of the steel belt 6 moves from a state of contact with the fixed pulley 901 or the movable pulley 902 to a state of no contact with the fixed pulley 901 or the movable pulley 902 at the slot 903. This prevents the steel belt 6 from rubbing against the fixed pulley 901 or the movable pulley 902. At the same time, due to the squeezing force of the fixed pulley 901 and the movable pulley 902 on the steel belt 6, a good transmission effect can still be maintained even when the friction of the steel belt 6 is reduced. The same principle applies when the front variable diameter pulley 9 is slowly shortened, thereby achieving the purpose of reducing friction.

[0052] When the front variable diameter pulley 9 shortens rapidly, the right slide 1002, affected by the friction of the moving fixed block 1001, moves synchronously with the fixed block 1001. At this time, the slide 1002 drives the reduction rubber ring 1203 to rub against the surface of the wedge plate 12042 through the connecting frame 1201 and the connecting plate 1202. When the moving speed is high, the adhesion section 12033 deforms, increasing the contact area with the wedge plate 12042 and improving the connection strength between the wedge plate 12042 and the right slide 1002. This transmits the power to the left reduction rubber ring 1203. The left reduction rubber ring 1203 deforms, thus transmitting the power from both sides to the left slide 1002. Due to the adhesion of the reduction rubber ring 1203, the change in the distance between the two slides 1002 is less than that between the fixed pulley 901 and the movable pulley. The changing speed of 902 causes the spring plates 1101 on both sides to bend. Under the action of the connecting block 10031 and the movable block 10032, the protrusion 10033 leaves the conical surface of the fixed pulley 901 and the movable pulley 902, thereby reducing the friction between it and the steel belt 6. When the front variable diameter pulley 9 shortens slowly, the moving speed of the deceleration rubber ring 1203 slows down, thereby reducing the deformation amplitude. The sliding plates 1002 on both sides shrink along with the fixed pulley 901 and the movable pulley 902, thereby causing the protrusion 10033 to fit against the conical surface of the fixed pulley 901 and the movable pulley 902, ensuring the friction between the steel belt 6 and the fixed pulley 901 and the movable pulley 902. When the changing speed slows down or stabilizes, the spring plate 1101 pushes the sliding plate 1002 to reset, thereby causing the protrusion 10033 to reset and fit against the surface of the steel belt 6.

[0053] When the front variable diameter pulley 9 expands rapidly, the steel belt 6 slides on the surface of the front variable diameter pulley 9 and shortens the rotation diameter. The deceleration rubber ring 1203 and the wedge plate 12042 are pulled together, which causes the sliding discs 1002 on both sides to fit tightly against the surfaces of the fixed pulley 901 and the movable pulley 902, respectively. Affected by the sliding discs 1002, the pressure of the convex strip 10033 on the steel belt 6 increases, thereby improving the transmission stability of the steel belt 6. At the same time, during the downward movement of the steel belt 6, the edge of the steel belt 6 moves from the groove 903 to contact the fixed pulley 901 and the movable pulley 902, thereby increasing the resistance of the steel belt 6, which further improves the transmission stability of the steel belt 6.

[0054] Although embodiments of the invention have been described, those skilled in the art can make variations and modifications to the embodiments with an understanding of the principles and spirit of the invention, and other effects can be obtained. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A planetary gear mechanical continuously variable transmission drive axle, comprising a housing (1), a planetary gearbox (2), an output shaft (3), a first hydraulic tank (4), a rear variable diameter pulley (5), and a steel belt (6), wherein the planetary gearbox (2) is connected to the housing (1), the output shaft (3) is connected to the housing (1), the first hydraulic tank (4) is connected to the output shaft (3), and the rear variable diameter pulley (5) is connected to the output shaft (3), characterized in that: It also includes an input shaft (7), a second hydraulic tank (8), a front variable diameter pulley (9), a pressure regulating assembly (10), a pusher (11), a resistance assembly (12), and a mounting block (13). The input shaft (7) is connected to the output end of the planetary gearbox (2), the second hydraulic tank (8) is connected to the input shaft (7), the front variable diameter pulley (9) is connected to the input shaft (7), the pressure regulating assembly (10) is connected to the front variable diameter pulley (9), and the pusher (11) is connected to the pressure regulating assembly (10). The resistance component (12) is connected to the pressure regulating component (10), the mounting block (13) is connected to the resistance component (12), the steel belt (6) is connected to the surface of the front variable diameter pulley (9) and the surface of the rear variable diameter pulley (5), when the front variable diameter pulley (9) changes diameter, the resistance component (12) limits the pressure regulating component (10), the pressure regulating component (10) slides in the front variable diameter pulley (9) to adjust the pressure on the steel belt (6), and the pusher (11) pushes the pressure regulating component (10) to reset in the variable diameter pulley; The front variable diameter pulley (9) includes a fixed pulley (901), a movable pulley (902), and slots (903). The fixed pulley (901) and the movable pulley (902) are both connected to the input shaft (7). The movable pulley (902) is connected to the power output end of the second hydraulic box (8). The facing surfaces of the fixed pulley (901) and the movable pulley (902) are conical. Multiple slots (903) are opened at equal angles along the central axis of the input shaft (7) on the surfaces of the fixed pulley (901) and the movable pulley (902). The pressure regulating assembly (10) includes a fixed block (1001), a sliding plate (1002), and a movable component (1003). The multiple fixed blocks (1001) are respectively connected to the opposite surfaces of the fixed pulley (901) and the movable pulley (902). The sliding plate (1002) is slidably connected to the fixed block (1001). The longitudinal section of the fixed block (1001) is trapezoidal. The sliding plate (1002) is connected to the movable component (1003). The movable component (1003) includes a connecting block (10031), a movable block (10032), and a protruding strip (10033). The connecting block (10031) is connected to the slide plate (1002), the movable block (10032) is connected to the connecting block (10031), and the protruding strip (10033) is connected to the movable block (10032). The movable block (10032) slides in the slot (903), and there is a gap between the facing surfaces of the two movable blocks (10032) and the facing surfaces of the fixed pulley (901) and the movable pulley (902). The longitudinal section of the protrusion (10033) is an isosceles trapezoid with the short side facing outward, and the protrusion (10033) is centrally located on the surface of the movable block (10032). The resistance assembly (12) includes a connecting frame (1201), a connecting plate (1202), a deceleration rubber ring (1203), and a clamp (1204). The connecting frame (1201) is connected to the slide plate (1002), the connecting plate (1202) is connected to the connecting frame (1201), the deceleration rubber ring (1203) is connected to the connecting plate (1202), and the clamp (1204) is connected to the deceleration rubber ring (1203). The end of the deceleration rubber ring (1203) away from the connecting frame (1201) extends to the outside of the clamp (1204). The longitudinal section of the connecting plate (1202) is semi-circular. The connecting frame (1201) is connected to the housing (1) through a mounting block (13).

2. The planetary gear mechanical continuously variable transmission drive axle according to claim 1, characterized in that: The longitudinal section of the slot (903) is an isosceles trapezoid with the short side facing the input shaft (7), and the two sides of the slot (903) are chamfered.

3. The planetary gear mechanical continuously variable transmission drive axle according to claim 1, characterized in that: The pusher (11) includes a spring plate (1101) and a limiting block (1102). The spring plate (1101) is connected to the slide (1002), and the limiting block (1102) is connected to both ends of the spring plate (1101). The spring plate (1101) is V-shaped.

4. The planetary gear mechanical continuously variable transmission drive axle according to claim 1, characterized in that: The deceleration rubber ring (1203) includes a connecting section (12031), a deformation section (12032), an adhesion section (12033), and a cavity (12034). The connecting section (12031) is connected to the connecting plate (1202), the deformation section (12032) is connected to the connecting section (12031), and the adhesion section (12033) is connected to the connecting section (12031). The connecting section (12031), the deformation section (12032), and the adhesion section (12033) form the cavity (12034).

5. The planetary gear mechanical continuously variable transmission drive axle according to claim 4, characterized in that: The card holder (1204) includes a card plate (12041) and a wedge plate (12042). The card plate (12041) is slidably connected to the housing (1). The contact surface between the wedge plate (12042) and the adhesion section (12033) is an inclined surface.

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