Continuously variable transmission and automobile

Abstract

The embodiment of the utility model provides a continuously variable transmission and an automobile, and relates to the field of transmissions. The continuously variable transmission comprises an input gear, a plunger pump, an adjusting structure and a connecting rod, the plunger pump and the input gear are arranged at an interval, the adjusting structure is arranged on the input gear, the first end of the connecting rod is rotatably connected to a plunger of the plunger pump, and the second end of the connecting rod is rotatably connected to the adjusting structure. The adjusting structure is arranged on the input gear, the connecting rod is connected with the adjusting structure, transmission between the input gear and the plunger pump is achieved through the adjusting structure and the connecting rod, the input gear drives the adjusting structure to move so as to drive the connecting rod to move, and the connecting rod can provide hydraulic pressure large enough for the plunger pump. In addition, the distance between the second end of the connecting rod and the circle center of the input gear can be continuously adjusted through the adjusting structure, and then stepless speed change is achieved. The embodiment of the utility model further provides an automobile which comprises the continuously variable transmission.

Description

Technical Field

[0001] This utility model relates to the field of transmissions, and more specifically, to a continuously variable transmission (CVT) and an automobile. Background Technology

[0002] During the development of automobiles, continuously variable transmissions (CVTs) were gradually invented. With CVTs, automobiles can continuously change the transmission ratio to meet different driving conditions.

[0003] Currently, the most common continuously variable transmissions (CVTs) on the market are hydraulic mechanical CVTs and metal belt CVTs. However, regardless of the type of CVT, they are difficult to transmit large torques, which makes them prone to slippage during rapid vehicle acceleration and under heavy load. Utility Model Content

[0004] This invention provides a continuously variable transmission (CVT) and an automobile that can solve the problem that existing CVTs cannot transmit large torques.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] An embodiment of this utility model provides a continuously variable transmission, which includes:

[0007] Input gear;

[0008] A plunger pump, with the plunger pump spaced apart from the input gear;

[0009] An adjustment mechanism is installed on the input gear.

[0010] The connecting rod has its first end rotatably connected to the plunger of the plunger pump, and its second end rotatably connected to an adjusting mechanism that can continuously adjust the distance between the second end of the connecting rod and the center of the input gear.

[0011] Optionally, the adjusting structure includes a sleeve and a hydraulic cylinder. The sleeve is arranged along the diameter direction of the input gear, and the middle part of the sleeve coincides with the center of the input gear. The hydraulic cylinder is installed inside the sleeve, and an axial groove is formed on the sleeve wall. The second end of the connecting rod passes through the axial groove and is connected to the piston rod of the hydraulic cylinder.

[0012] Optionally, the sleeve is also provided with a pusher, which is located on the side of the sleeve away from the hydraulic cylinder. The pusher can push the connecting rod to move towards the hydraulic cylinder when the hydraulic cylinder is depressurized.

[0013] Optionally, the adjustment structure includes a worm gear, a rotating cap, and a stepper motor. The worm gear is connected to the output end of the stepper motor, the rotating cap is rotatably engaged with the worm gear, and the second end of the connecting rod is rotatably connected to the rotating cap.

[0014] Optionally, the continuously variable transmission also includes a hydraulic motor, which is connected to the piston pump via an oil pipeline, and the piston pump, oil pipeline and hydraulic motor form a circulation loop.

[0015] Optionally, the plunger pump is also equipped with a check valve, which allows the oil in the circulation loop to flow in one direction only.

[0016] Optionally, a flow pulsation compensation valve is installed on the oil pipeline.

[0017] Optionally, a reversing valve is provided on the circulation loop.

[0018] Optionally, the plunger pump has multiple plungers, which are spaced apart, and each plunger is individually connected to an adjustment structure. The corresponding adjustment structures are equally distributed on the input gear along the diameter direction of the gear.

[0019] An embodiment of this utility model also provides an automobile, including the continuously variable transmission described above.

[0020] The beneficial effects of this utility model embodiment:

[0021] This continuously variable transmission (CVT) includes an input gear, a piston pump, an adjusting structure, and a connecting rod. The piston pump is spaced apart from the input gear, and the adjusting structure is located on the input gear. The first end of the connecting rod is rotatably connected to the piston of the piston pump, and the second end of the connecting rod is rotatably connected to the adjusting structure. The adjusting structure can continuously adjust the distance between the second end of the connecting rod and the center of the input gear. In this embodiment, the adjusting structure is located on the input gear, and the connecting rod is connected to the adjusting structure. Transmission between the input gear and the piston pump is achieved through the adjusting structure and the connecting rod. The input gear drives the adjusting structure to move, which in turn drives the connecting rod. The connecting rod can provide sufficient hydraulic pressure to the piston pump, thereby outputting high torque. Furthermore, the adjusting structure allows for continuous adjustment of the distance between the second end of the connecting rod and the center of the input gear, thus achieving continuously variable transmission.

[0022] The car includes a continuously variable transmission (CVT), which has all the functions of a CVT. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a continuously variable transmission (CVT) provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of an adjustment structure provided in an embodiment of the present invention.

[0026] Icons: 1-Input gear; 2-Plunger pump; 20-Plunger; 21-Plunger cylinder; 211-Oil outlet; 212-Oil return; 3-Adjusting structure; 30-Sleeve; 301-Axial groove; 302-Pushing component; 31-Hydraulic cylinder; 311-Piston rod; 4-Connecting rod; 40-First end; 41-Second end; 5-Hydraulic motor; 6-Oil pipeline; 7-Directional valve. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Unless otherwise explicitly specified and limited, terms such as "setup" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] It should be noted that, for the sake of simplicity, the aforementioned method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders or simultaneously. The steps in the methods of this application embodiments can be adjusted, combined, or deleted according to actual needs.

[0035] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0036] Transmissions are used to address the limited speed range of a vehicle's powertrain (internal combustion engine). Transmissions typically have several gears, each corresponding to a specific gear ratio. The driver selects the appropriate gear ratio based on the vehicle's driving conditions to ensure smooth operation. Currently, there are three main types of transmissions used in automobiles: manual spur gear transmissions, Simpson planetary gear transmissions, and hydraulic-belt transmissions. Spur gear and planetary gear transmissions have several fixed gear ratios. When vehicle speed changes, it's impossible to constantly adjust the gear ratio to maintain a constant engine speed and ensure maximum torque output. While hydraulic-belt continuously variable transmissions (CVTs) allow for arbitrary gear ratio settings within a certain range, their design makes them less capable of transmitting large torques, leading to slippage during rapid acceleration and under heavy loads.

[0037] In view of this, the present invention provides a continuously variable transmission and a car that can solve the above problems, which will be described in detail below.

[0038] Please refer to Figure 1 and Figure 2 The continuously variable transmission includes an input gear 1, a plunger pump 2, an adjustment structure 3, and a connecting rod 4. The plunger pump 2 is spaced apart from the input gear 1. The adjustment structure 3 is located on the input gear 1. The first end 40 of the connecting rod 4 is rotatably connected to the plunger 20 of the plunger pump 2. The second end 41 of the connecting rod 4 is rotatably connected to the adjustment structure 3. The adjustment structure 3 can continuously adjust the distance between the second end 41 of the connecting rod 4 and the center of the input gear 1.

[0039] In this embodiment of the invention, the adjustment structure 3 is mounted on the input gear 1. The input gear 1 drives the adjustment structure 3 to move. The connecting rod 4 is connected to the adjustment structure 3, thereby driving the connecting rod 4 to move. The input gear 1 and the plunger pump 2 are transmitted through the adjustment structure 3 and the connecting rod 4. The connecting rod 4 can provide the plunger pump 2 with a sufficiently large hydraulic pressure, so that the plunger pump 2 can output a large torque. Moreover, the distance between the second end 41 of the connecting rod 4 and the center of the input gear 1 can be continuously adjusted through the adjustment structure 3 to achieve stepless speed change.

[0040] Specifically, the adjusting structure 3 is set along the diameter direction of the input gear 1. When the input gear 1 rotates, it drives the adjusting structure 3 to rotate. The adjusting structure 3 drives the connecting rod 4 to drive the plunger 20 of the plunger pump 2 to reciprocate, thereby outputting hydraulic pressure through oil.

[0041] The plunger pump 2 includes a plunger 20 and a plunger cylinder 21. The plunger 20 is located in the plunger cylinder 21 and can move like a piston along the cylinder. The plunger cylinder 21 is provided with an oil outlet 211 and an oil return hole 212. The oil in the plunger cylinder 21 can flow out through the oil outlet 211 and return through the oil return hole 212. Both the oil outlet 211 and the oil return hole 212 are connected to oil pipes 6. The oil pipes 6 are connected to a hydraulic motor 5. The hydraulic motor 5 is connected to the plunger cylinder 21 through the oil pipes 6. The plunger pump 2, the oil pipes 6, and the hydraulic motor 5 form a circulation loop. As the plunger 20 reciprocates, the oil in the plunger cylinder 21 is pressurized and squeezed through the oil pipes 6 to the hydraulic motor 5. The hydraulic motor 5 converts the hydraulic energy of the oil into mechanical energy. After the work is completed, the oil returns to the plunger cylinder 21 through the oil return hole 212 via another oil pipe 6, and the work is performed in this cycle.

[0042] One-way valves are also provided at the oil outlet 211 and oil return 212 of the plunger pump 2. The one-way valves make the oil in the circulation loop flow in one direction, so that the oil always exits from the oil outlet 211 of the plunger cylinder 21 and returns from the oil return 212. The one-way valves determine that the power can only be transmitted from the plunger pump 2 to the hydraulic motor 5 side, and cannot be transmitted from the hydraulic motor 5 to the plunger pump 2. If the power is input from the hydraulic motor 5 side, the oil in the circulation loop will be directly blocked by the one-way valve at the oil outlet 211 or the oil return 212, and the oil cannot apply pressure to the plunger 20 and therefore cannot drive the plunger 20.

[0043] A reversing valve 7 is also installed on the oil pipeline 6, which enables the hydraulic motor 5 to reverse its operation. Specifically, the oil in the oil pipeline 6 has its flow direction switched at the reversing valve 7, and the oil flowing to the hydraulic motor 5 in the forward direction is switched to flow to the hydraulic motor 5 in the reverse direction, thereby realizing the reversing of the hydraulic motor 5. When applied to automobiles, this is manifested as the shifting from forward gear to reverse gear.

[0044] Of course, the directional valve 7 can also be equipped with an oil return function, so that the oil flowing out of the plunger pump 2 can be directly returned to the plunger pump 2 through the oil pipeline 6, the directional valve 7, and the oil pipeline 6. The oil does not pass through the hydraulic motor 5, so that the hydraulic motor 5 is in neutral. At this time, the directional valve 7 can control the forward flow, reverse flow and oil return of the oil.

[0045] Optionally, to achieve a compact overall structure for the continuously variable transmission (CVT), all hydraulic lines 6 can be directly housed within the casings of the piston pump 2, directional valve 7, and hydraulic motor 5, allowing these hydraulic lines 6 to withstand greater pressure and thus transmit greater torque. Alternatively, all hydraulic lines 6 can be made of high-strength, pressure-resistant materials, or they can be thickened to improve their ability to withstand hydraulic pressure.

[0046] Continue to refer to Figure 2 The plunger 20 is connected to the adjusting structure 3 via the connecting rod 4. The adjusting structure 3 is used to continuously adjust the distance between the connecting rod 4 and the center support of the input gear 1. Specifically, the second ends 41 of both rods are tractably connected to the adjusting structure 3, and the first end 40 of the connecting rod 4 is rotatably connected to the plunger 20. When the distance between the second end 41 of the connecting rod 4 and the center of the input gear 1 changes, the stroke of the plunger 20 reciprocating also changes, resulting in different hydraulic energy applied by the oil in the plunger cylinder 21, thus outputting different torques. It can be seen that when the second end 41 of the connecting rod 4 coincides with the center of the input gear 1, that is, when the connection between the second end 41 of the connecting rod 4 and the adjusting structure 3 coincides with the center of the input gear 1, the rotation of the input gear 1 does not drive the connecting rod 4 to move, so the plunger 20 will not move. At this time, the hydraulic motor 5 is not driven by hydraulic force and is in neutral.

[0047] Optionally, the adjusting structure 3 is a hydraulic system, comprising a sleeve 30 and a hydraulic cylinder 31. The sleeve 30 is fixedly arranged along the diameter direction of the input gear 1, and the middle part of the sleeve 30 coincides with the center of the input gear 1. The sleeve 30 is hollow inside, and the hydraulic cylinder 31 is installed inside the sleeve 30. An axial groove 301 is formed on the sleeve wall, penetrating the side wall of the sleeve 30. The second end 41 of the connecting rod 4 is connected to a hinge joint, one end of which passes through the axial groove 301 and is connected to the piston rod 311 of the hydraulic cylinder 31. When the piston rod 311 moves, it drives the hinge joint and the second end 41 of the connecting rod 4 to move together. For example, when the piston rod 311 retracts and pulls the hinge joint to coincide with the center of the input gear 1, the transmission is in neutral. By precisely controlling the movement of the hydraulic cylinder 31 and the piston rod 311, precise control of the transmission ratio can be achieved.

[0048] Of course, the sleeve 30 here can also be replaced by other mounting structures, as long as the set requirements can be met. This embodiment of the utility model does not limit this.

[0049] Optionally, a pusher 302 is also provided inside the sleeve 30. The pusher 302 is located on the side of the sleeve 30 away from the hydraulic cylinder 31. The pusher 302 can push the connecting rod 4 to move towards the hydraulic cylinder 31 when the hydraulic cylinder 31 is depressurized. The hinge joint connected to the piston rod 311 and the second end 41 of the connecting rod 4 coincide with the center of the input gear 1, so that the transmission automatically enters neutral. For example, the pusher 302 is a spring. When there is leakage or pressure loss in the pipeline that supplies hydraulic oil to the hydraulic cylinder 31 or in other parts of the adjustment structure 3, the compressed spring can gradually push the piston rod 311 back to the hydraulic cylinder 31, so as to avoid the transmission ratio of the transmission becoming uncontrollable when the adjustment structure 3 malfunctions. The pusher 302 helps to improve the safety of the vehicle during driving.

[0050] In another embodiment of this utility model, the adjusting structure 3 includes a worm gear, a rotating cap, and a stepper motor. The worm gear and the output end of the stepper motor are connected via a shaft connector. The rotating cap is fitted onto the worm gear and rotates in cooperation with it. The second end 41 of the connecting rod 4 is rotatably connected to the rotating cap. When the stepper motor operates, it drives the worm gear to rotate. The rotating cap fitted onto the worm gear rotates relative to the worm gear and moves along the axial direction of the worm gear, thereby driving the second end 41 of the connecting rod 4 to move, so as to adjust the distance between the second end 41 of the connecting rod 4 and the center of the input gear 1. It is worth mentioning that the axial direction of the worm gear is along the diameter direction of the input gear 1.

[0051] In other embodiments, the adjustment structure 3 may also be in other structural forms. This utility model embodiment does not limit this, as long as the adjustment structure 3 can meet the adjustment requirements and transmission requirements.

[0052] Because the input gear 1, adjusting structure 3, and connecting rod 4 may generate significant vibrations during transmission, and a single connecting rod 4 and adjusting structure 3 cannot achieve uniform reciprocating motion of the plunger 20, the plunger pump 2 has multiple plungers 20 in order to reduce vibration, noise generated by vibration, and fluid pulsation. These multiple plungers 20 are arranged in parallel with intervals, and each plunger 20 is individually connected to a connecting rod 4 and an adjusting structure 3. The corresponding multiple adjusting structures 3 are equally distributed along the diameter of the gear on the input gear 1. For example, with two plungers 20, two adjusting structures 3, and two connecting rods 4, the angle between the two adjusting structures 3 in opposite directions is 180°. When three plungers 20, three adjusting structures 3, and three connecting rods 4 are used, the angle between the three adjusting structures 3 in opposite directions is 120°, and so on. The more adjusting structures 3 there are, the smoother the movement of the plunger 20.

[0053] Of course, multiple adjustment structures 3 and one plunger 20 can also be set. Multiple adjustment structures 3 are connected in parallel with plunger 20 through multiple connecting rods 4, thereby driving plunger 20 to reciprocate. Among them, the multiple adjustment structures 3 adjust synchronously.

[0054] To further reduce the adverse effects of fluid flow pulsation, decrease the possibility of cavitation, and ensure smooth operation of the hydraulic motor 5, a fluid flow pulsation compensation valve can be installed on the oil pipeline 6. When the oil pipeline 6 experiences instantaneous high pressure, a portion of the high-pressure oil pushes open the piston of the fluid flow pulsation compensation valve and enters the valve. When the oil pipeline 6 returns to low pressure, the high-pressure oil that entered the fluid flow pulsation compensation valve is pushed back into the oil pipeline 6 by the piston spring, compensating for the oil flow loss caused by the pressure reduction and making the flow of hydraulic oil in the pipeline more stable. Of course, to prevent backflow of the pushed-back oil, the connecting pipe between the fluid flow pulsation compensation valve and the oil pipeline 6 must be arranged at an angle, and the outlet of the connecting pipe should face the direction of oil flow.

[0055] Secondly, since the hydraulic motor 5 is connected to the drive wheel, a torsional damper can be added between the hydraulic motor 5 and the drive wheel to reduce the power fluctuations actually output to the drive wheel and further improve the smoothness of operation.

[0056] Continue to refer to Figure 1 Since the input gear 1 needs to resist the bending and torsional stress from the connecting rod 4 to make the power transmission smoother, an auxiliary support gear that meshes with it can be added to the outside of the input gear 1 to improve the ability of the input gear 1 axle to resist the bending and torsional stress from the connecting rod 4.

[0057] Optionally, an auxiliary support wheel can be provided at the connection between the second end 41 of the connecting rod 4 and the piston rod 311. The auxiliary support wheel is provided with a radial groove, one end of which extends to the center of the auxiliary support wheel. The length of the radial groove is the same as the extension length of the piston rod 311. A protruding slider is provided at the connection between the second end 41 of the connecting rod 4 and the piston rod 311. The slider fits into the radial groove and can only slide along the radial groove. The slider can be driven by the extension movement of the piston rod 311, thereby further improving the ability of the input gear 1 shaft to resist the bending and torsional stress from the connecting rod 4.

[0058] Optionally, a spring is also provided inside the radial groove of the auxiliary support wheel, with the spring located at both ends of the slider, to further improve the ability of the input gear 1 axle to resist bending and torsional stress from the connecting rod 4.

[0059] Alternatively, a small hydraulic cylinder can be embedded in the slider, which is connected to a hydraulic line, so that the slider and the hinge joint are simultaneously driven by the small hydraulic cylinder and the piston rod 311, in order to further improve the ability of the input gear 1 axle to resist bending and torsional stress from the connecting rod 4.

[0060] It is worth mentioning that any of the above-mentioned methods can be used to improve the ability of the input gear 1 axle to resist the bending and torsional stress from the connecting rod 4. Alternatively, two or three of the methods can be combined to improve the ability of the input gear 1 axle to resist the bending and torsional stress from the connecting rod 4. For example, an auxiliary support gear can be set on the outside of the input gear 1, an auxiliary support wheel can be set at the connection between the second end 41 of the connecting rod 4 and the piston rod 311, and a spring can be set inside the radial groove of the auxiliary support wheel. Another example is that an auxiliary support gear can be set on the outside of the input gear 1, an auxiliary support wheel can be set at the connection between the second end 41 of the connecting rod 4 and the piston rod 311, and a small hydraulic cylinder can be embedded in the slider.

[0061] The continuously variable transmission (CVT) of this embodiment can adjust the transmission ratio in real time according to the engine status to maximize the engine's power efficiency. Since the transmission's speed range is a fixed interval, from zero to any value, the transmission ratio between the lowest and highest speeds can be set to a difference of ten times or more. Even for ordinary diesel engines with a speed range of only about 800-3000 rpm, a final vehicle speed range of 8-240 km / h can be achieved (the diesel engine provides 3 times the speed, and the transmission provides 10 times the speed, resulting in a total speed range of 30 times. Assuming the vehicle's minimum design speed is 8 km / h, the corresponding diesel engine idle speed is 800-1000 rpm, and the maximum speed is 8*30=240 km / h). For most gasoline engines with a speed range of 800-6000 rpm, and electric motors with a larger speed range, the working stroke variation range of the plunger 20 can be further reduced, thereby reducing design difficulty and minimizing the size of the assembly.

[0062] The continuously variable transmission (CVT) of this embodiment has the ability to transmit large torques, and at the same time adopts hydraulic transmission, resulting in high transmission efficiency, compact overall structure, large variable range of transmission ratio, and good adaptability when applied to automobiles.

[0063] The working principle of the continuously variable transmission (CVT) according to this embodiment of the utility model is as follows:

[0064] When the input gear 1 rotates, it drives the adjusting structure 3 to move. The adjusting structure 3 drives the connecting rod 4 to move, and the connecting rod 4 drives the plunger 20 to reciprocate. The plunger pump 2 causes the hydraulic oil to flow unidirectionally along the oil pipeline 6. The oil passes through the reversing valve 7 and flows through the hydraulic motor 5. The hydraulic motor 5 drives the drive wheel connected to it to rotate, completing the transmission. Changing the extension length of the piston rod 311 or changing the position of the rotating cap changes the distance between the second end 41 of the connecting rod 4 and the center of the input gear 1, thereby changing the working stroke of the plunger 20. The greater the distance between the second end 41 of the connecting rod 4 and the center of the input gear 1, the longer the working stroke of the plunger 20. Assuming that the speed of the input gear 1 remains constant, the amount of oil pumped by the plunger pump 2 in the same amount of time increases. Since the cross-sectional area of ​​the one-way valve of the plunger pump 2 remains constant, the oil flow rate will increase, thereby increasing the speed of the hydraulic motor 5, completing the speed change. Due to the leverage effect, the thrust transmitted from the input gear 1 will be lower, resulting in a lower thrust of the plunger 20 to push the oil, which in turn leads to a lower torque transmitted to the hydraulic motor 5.

[0065] An embodiment of this utility model also provides a car that can use the continuously variable transmission (CVT) described in this embodiment. The car equipped with the CVT can transmit large torque, thereby preventing the car from slipping during rapid acceleration and under heavy load, making the car safer to drive.

[0066] Of course, when the continuously variable transmission (CVT) described in this embodiment of the present invention is applied to a traditional internal combustion engine-powered vehicle, since the transmission is unidirectional, a retarder may need to be installed at the power output end to obtain an engine braking effect similar to that of an internal combustion engine. The retarder can be electromagnetic, hydraulic, or aerodynamic, etc., and the retarder can also be part of a braking energy recovery system to recover braking energy. Of course, the CVT of this embodiment of the present invention can also be applied to pure electric vehicles and hybrid vehicles.

[0067] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A continuously variable transmission (CVT), characterized in that, include: Input gear (1); A plunger pump (2) is provided at an interval from the input gear (1); Adjustment structure (3), the adjustment structure (3) is disposed on the input gear (1); The connecting rod (4) has its first end (40) rotatably connected to the plunger (20) of the plunger pump (2), and its second end (41) rotatably connected to the adjusting structure (3). The adjusting structure (3) can continuously adjust the distance between the second end (41) of the connecting rod (4) and the center of the input gear (1).

2. The continuously variable transmission according to claim 1, characterized in that, The adjustment structure (3) includes a sleeve (30) and a hydraulic cylinder (31). The sleeve (30) is arranged along the diameter direction of the input gear (1), and the middle part of the sleeve (30) coincides with the center of the input gear (1). The hydraulic cylinder (31) is installed inside the sleeve (30). An axial groove (301) is provided on the cylinder wall of the sleeve (30). The second end (41) of the connecting rod (4) passes through the axial groove (301) and is connected to the piston rod (311) of the hydraulic cylinder (31).

3. The continuously variable transmission according to claim 2, characterized in that, The sleeve (30) is also provided with a pusher (302), which is located inside the sleeve (30) on the side away from the hydraulic cylinder (31). The pusher (302) can push the connecting rod (4) to move towards the hydraulic cylinder (31) when the hydraulic cylinder (31) is depressurized.

4. The continuously variable transmission according to claim 1, characterized in that, The adjustment structure (3) includes a worm gear, a rotating cap and a stepper motor. The worm gear is connected to the output end of the stepper motor. The rotating cap is rotatably engaged with the worm gear. The second end (41) of the connecting rod (4) is rotatably connected to the rotating cap.

5. The continuously variable transmission according to claim 1, characterized in that, The continuously variable transmission also includes a hydraulic motor (5), which is connected to the plunger pump (2) through an oil pipe (6). The plunger pump (2), the oil pipe (6), and the hydraulic motor (5) form a circulation loop.

6. The continuously variable transmission according to claim 5, characterized in that, The plunger pump (2) is also equipped with a check valve, which allows the oil in the circulation loop to flow in one direction.

7. The continuously variable transmission according to claim 5, characterized in that, A flow pulsation compensation valve is installed on the oil pipeline (6).

8. The continuously variable transmission according to claim 5, characterized in that, A reversing valve (7) is installed on the circulation loop.

9. The continuously variable transmission according to any one of claims 1-8, characterized in that, The plunger pump (2) has a plurality of plungers (20), which are spaced apart, and each plunger (20) is individually connected to the adjustment structure (3). The corresponding plurality of adjustment structures (3) are equally distributed on the input gear (1) along the diameter direction of the gear.

10. A car, characterized in that, Including the continuously variable transmission as described in any one of claims 1-9.

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