Hydraulic continuously variable transmission

Abstract

The utility model relates to transmission technical field, concretely is a kind of hydraulic stepless gearbox, comprising: clutch, for providing the mechanical power of interchanger, using wet clutch, through first gear drive mechanism input engine partial power, and pass through second gear drive mechanism transmission to planetary reduction gear device;Hydraulic power transmission device, for providing the stepless hydraulic power of interchanger, it passes through first gear drive mechanism input engine partial power, and pass through second gear drive mechanism transmission to planetary reduction gear device;Planetary reduction gear device, for gathering the power of hydraulic power transmission device and clutch, again power transmission to speed change device.The above-mentioned hydraulic stepless gearbox can realize continuous speed change, and speed change device and clutch linkage, jointly control the gear shifting of transmission, and operator can quickly, stably carry out gear switching, and speed change device can realize forward and backward and the stepless control of multiple gears.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, specifically a hydraulic continuously variable transmission. Background Technology

[0002] Currently, the mechanical shift tractors mainly used by customers require disengaging the main clutch during gear shifting, interrupting power transmission and reducing the tractor's operating efficiency. Completing multiple complex operating processes, including operation, steering, gear shifting, and tool adjustment, is cumbersome, difficult, and demanding. Utility Model Content

[0003] The purpose of this invention is to provide a hydraulic continuously variable transmission (CVT) to overcome the problems existing in the current equipment.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hydraulic continuously variable transmission, comprising: The clutch is used to provide mechanical power to the gearbox. It is a wet clutch that inputs part of the engine power through the first gear transmission mechanism and transmits it to the planetary reduction gear through the second gear transmission mechanism. A hydraulic power transmission device is used to provide continuously variable hydraulic power to the gearbox. It inputs part of the engine power through a first gear transmission mechanism and transmits it to the planetary reduction gear through a second gear transmission mechanism. Planetary reduction gear is used to combine the power of the hydraulic power transmission device and the clutch, and then transmit the power to the gear shifting device. The gear shifting device is used in conjunction with the clutch to control the gearbox shifting, achieving stepless control of each gear. The gear shifting device includes a first drive shaft, a second drive shaft, a reverse gear shaft, a reverse transition double gear rotatably mounted on the reverse gear shaft, a first-gear drive gear, a reverse gear drive gear, a second-gear drive gear, and a third-gear drive gear mounted on the first drive shaft, and a first-gear driven gear, a reverse gear driven gear, a second-gear driven gear, and a third-gear driven gear mounted on the second drive shaft. The first-gear drive gear meshes with the first-gear driven gear, the reverse gear drive gear meshes with the reverse transition double gear, the reverse transition double gear meshes with the reverse gear driven gear, the second-gear drive gear meshes with the second-gear driven gear, and the third-gear drive gear meshes with the third-gear driven gear. A reverse gear engagement sleeve is provided between the first-gear driven gear and the reverse gear driven gear, and a second-third gear engagement sleeve is provided between the second-gear drive gear and the third-gear drive gear. Both the first-gear reverse gear engagement sleeve and the second-third gear engagement sleeve are connected to hydraulic cylinders.

[0005] Based on the above technical solution, the present invention can be further improved as follows: As a further improvement to the above technical solution, the first gear transmission mechanism includes a third gear connected to the engine, a first gear connected to the hydraulic power transmission device, and a second gear connected to the clutch.

[0006] As a further improvement to the above technical solution, the planetary reduction device includes a ring gear, a sun gear, and a planetary gear carrier. The ring gear is used to receive continuously variable hydraulic power from the hydraulic power transmission device, and the sun gear is used to receive mechanical power from the clutch. The planetary gear carrier combines continuously variable hydraulic power and mechanical power and transmits the hybrid power to the gear shifting device.

[0007] As a further improvement to the above technical solution, the hydraulic power transmission device includes a hydraulic pump and a motor. The hydraulic pump converts the input mechanical power into hydraulic power and transmits it to the motor. The motor converts the hydraulic power output by the hydraulic pump into mechanical power.

[0008] As a further improvement to the above technical solution, one end of the transmission shaft is connected to the planetary gear carrier of the planetary reduction device. The first gear drive gear and the reverse gear drive gear are fixedly mounted on the transmission shaft, and the second gear drive gear and the third gear drive gear are rotatably mounted on the transmission shaft. The second gear driven gear and the third gear driven gear are fixedly mounted on the transmission shaft, and the first gear driven gear and the reverse gear driven gear are rotatably mounted on the transmission shaft.

[0009] As a further improvement to the above technical solution, the reverse gear engagement sleeve is splined on the second transmission shaft. The reverse gear engagement sleeve is driven by a hydraulic cylinder to move axially along the second transmission shaft and engage with the first gear driven gear or the reverse gear driven gear. When the reverse gear engagement sleeve moves to the left and engages with the first gear driven gear, it switches to the first gear position; when the reverse gear engagement sleeve moves to the right and engages with the reverse gear driven gear, it switches to the reverse gear position.

[0010] As a further improvement to the above technical solution, the second and third gear engagement sleeve is splined and mounted on the first transmission shaft. The second and third gear engagement sleeve is driven by a hydraulic cylinder to move axially along the first transmission shaft and engage with the second or third gear drive gear. When the second and third gear engagement sleeve moves to the left and engages with the second gear drive gear, it switches to the second gear position; when the second and third gear engagement sleeve moves to the right and engages with the third gear drive gear, it switches to the third gear position.

[0011] As a further improvement to the above technical solution, a wheel drive drive gear is fixedly installed on the second transmission shaft. The wheel drive drive gear is a bevel gear and is connected to the wheel drive mechanism. The wheel drive mechanism is connected to the two wheels of the tractor.

[0012] As a further improvement to the above technical solution, the wheel drive mechanism includes a left half-shaft, a left half-shaft gear, a driven bevel gear, a planetary gear shaft, a planetary gear, a right half-shaft gear, and a right half-shaft. The driven bevel gear meshes with the wheel drive driving gear. The planetary gear is mounted on the planetary gear shaft and can rotate freely. The left half-shaft and the right half-shaft are respectively fitted into the left half-shaft gear and the right half-shaft gear through spline gears. The two sides of the planetary gear mesh with the left half-shaft gear and the right half-shaft gear respectively to form a differential transmission system.

[0013] The beneficial effects of this utility model are as follows: The aforementioned hydraulic continuously variable transmission (CVT) utilizes a connection structure that combines a hydraulic power transmission device, a clutch, a planetary reduction gear, and a gear shifting device. Simultaneously employing both hydraulic and mechanical power, it achieves continuous speed changes during gear shifting, meeting the requirements of frequent forward and reverse movement and speed adjustments by the tractor. Because the aforementioned hydraulic CVT can provide continuous speed changes, the tractor performs excellently in agricultural operations. The gear shifting device, linked to the clutch, jointly controls the gearbox's shifting, allowing the operator to quickly and smoothly switch gears. The gear shifting device enables stepless control of forward and reverse movement and multiple gears; in practical applications, this greatly improves the tractor's operational convenience and work efficiency. Whether tilling, sowing, or harvesting, the aforementioned hydraulic CVT allows the tractor to achieve maximum efficiency under various operating conditions. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a simplified structural diagram of the hydraulic continuously variable transmission provided in a preferred embodiment of the present invention; Figure 2 yes Figure 1 A simplified structural diagram showing the connection between the hydraulic continuously variable transmission (CVT) and the engine and wheel drive mechanism. In the diagram: 1. Engine; 2. Clutch; 3. First gear transmission mechanism; 4. Hydraulic power transmission device; 41. Hydraulic pump; 42. Motor; 5. Second gear transmission mechanism; 6. Planetary reducer; 61. Ring gear; 62. Sun gear; 63. Planetary gear carrier; 71. Drive shaft one; 711. First gear drive gear; 712. Second gear drive gear; 713. Third gear drive gear; 714. Reverse gear drive gear; 715. Second and third gear engagement sleeve; 72. Drive shaft two; 721, First gear driven gear; 722, Second gear driven gear; 723, Third gear driven gear; 724, Reverse gear driven gear; 725, First / Reverse gear engagement sleeve; 726, Wheel drive drive gear; 73, Reverse gear shaft; 731, Reverse gear transition double gear; 81, Left half shaft; 82, Left half shaft gear; 83, Driven bevel gear; 84, Planetary gear shaft; 85, Planetary gear; 86, Right half shaft gear; 87, Right half shaft; 88, Wheel. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0017] like Figure 1 , Figure 2 As shown, a preferred embodiment of the present invention provides a hydraulic continuously variable transmission, comprising: Clutch 2 is used to provide mechanical power to the gearbox. It is a wet clutch. Part of the power is input to the engine 1 through the first gear transmission mechanism 3 and transmitted to the planetary reduction gear 6 through the second gear transmission mechanism 5. The hydraulic power transmission device 4 is used to provide stepless hydraulic power to the gearbox. It inputs part of the power from the engine 1 through the first gear transmission mechanism 3 and transmits it to the planetary reduction device 6 through the second gear transmission mechanism 5. Planetary reduction gear 6 is used to combine the power of hydraulic power transmission device 4 and clutch 2, and then transmit the power to the gear shifting device. The gear shifting device is used in conjunction with clutch 2 to control the gear shifting of the gearbox, so as to achieve stepless control of each gear.

[0018] Specifically, the first gear transmission mechanism 3 includes a third gear connected to the engine 1, a first gear connected to the hydraulic power transmission device 4, and a second gear connected to the clutch 2.

[0019] Specifically, the planetary reduction gear 6 includes a ring gear 61, a sun gear 62, and a planetary gear carrier 63. The ring gear 61 is used to receive continuously variable hydraulic power from the hydraulic power transmission device 4, and the sun gear 62 is used to receive mechanical power from the clutch 2. The planetary gear carrier 63 combines continuously variable hydraulic power and mechanical power and transmits the hybrid power to the gear shifting device.

[0020] Specifically, the hydraulic power transmission device 4 includes a hydraulic pump 41 and a motor 42. The hydraulic pump 41 converts the input mechanical power into hydraulic power and transmits it to the motor 42. It also adjusts the output hydraulic flow according to a control signal, thereby achieving stepless power regulation. The motor 42 converts the hydraulic power output from the hydraulic pump 41 into mechanical power and transmits it to the ring gear 61 of the planetary reduction gear 6 through the second gear transmission mechanism 5. The motor 42 ensures that the gearbox can obtain stable output torque and speed in different operating environments. The planetary reduction gear 6 serves to collect and transmit power. Through close cooperation with the motor 42, the planetary reduction gear 6 transmits stepless hydraulic power to the ring gear 61. Through interaction with the sun gear 62 and planetary gears, it effectively disperses and transmits high-intensity torque and traction, ensuring stable operation under complex working conditions and reducing mechanical failures and wear caused by high-intensity operation.

[0021] The clutch 2 is a wet clutch, allowing the operator to control the tractor's speed and direction more easily and smoothly, thereby improving work efficiency. The clutch 2 transmits the mechanical power of the engine 1 to the sun gear 62 of the planetary reduction gear 6 via the second gear transmission mechanism 5. The sun gear 62 of the planetary reduction gear 6 can adjust the output torque and speed according to actual needs, ensuring stable and efficient operation under various conditions. In conjunction with electronic shifting, the wet clutch disengages during gear shifting, and engages slowly after gear engagement, achieving a smooth speed transition.

[0022] The gear shifting device is linked to the clutch 2 for control. When the gear shifting device changes gears, the clutch 2 is in the disengaged state; when the gear shifting device changes gears, the clutch 2 is in the engaged state. The entire linkage process is very short, allowing the operator to quickly and smoothly shift gears while ensuring smooth power transmission during the shift, reducing the impact and vibration caused by gear shifting. The gear shifting device can achieve fully automatic gear shifting, providing the corresponding mechanical gear and hydraulic power according to the set speed, and controlling the corresponding mechanical gear and hydraulic pump 41 displacement according to the load.

[0023] The gear shifting device includes a first drive shaft 71, a second drive shaft 72, a reverse gear shaft 73, a reverse transition double gear 731 rotatably mounted on the reverse gear shaft 73, a first gear drive gear 711, a reverse gear drive gear 714, a second gear drive gear 712 and a third gear drive gear 713 mounted on the first drive shaft 71, and a first gear driven gear 721, a reverse gear driven gear 724, a second gear driven gear 722 and a third gear driven gear 723 mounted on the second drive shaft 72.

[0024] Specifically, one end of the drive shaft 71 is connected to the planetary gear carrier 63 of the planetary reduction gear 6. The first gear drive gear 711 and the reverse gear drive gear 714 are fixedly mounted on the drive shaft 71, while the second gear drive gear 712 and the third gear drive gear 713 are rotatably mounted on the drive shaft 71. The second gear driven gear 722 and the third gear driven gear 723 are fixedly mounted on the drive shaft 72, while the first gear driven gear 721 and the reverse gear driven gear 724 are rotatably mounted on the drive shaft 72. The first gear drive gear 711 meshes with the first gear driven gear 721, and the reverse gear drive gear 714 transitions with the reverse gear. The large teeth of the double gear 731 mesh, the small teeth of the reverse transition double gear 731 mesh with the reverse driven gear 724, the second gear drive gear 712 meshes with the second gear driven gear 722, and the third gear drive gear 713 meshes with the third gear driven gear 723; a reverse gear engagement sleeve 725 is provided between the first gear driven gear 721 and the reverse gear driven gear 724, and the reverse gear engagement sleeve 725 is sleeved on the second drive shaft 72 via a spline; a second-third gear engagement sleeve 715 is provided between the second gear drive gear 712 and the third gear drive gear 713, and the second-third gear engagement sleeve 715 is sleeved on the first drive shaft 71 via a spline.

[0025] A reverse gear engagement sleeve 725 is connected to a hydraulic cylinder. The hydraulic cylinder can drive the reverse gear engagement sleeve 725 to move axially along the transmission shaft 72 and engage with the first gear driven gear 721 or the reverse gear driven gear 724. When the reverse gear engagement sleeve 725 moves to the left and engages with the first gear driven gear 721, it switches to the first gear position. The transmission route of the power output by the engine 1 is: transmission shaft 71 → first gear drive gear 711 → first gear driven gear 721 → transmission shaft 72. When the reverse gear engagement sleeve 725 moves to the right and engages with the reverse gear driven gear 724, it switches to the reverse gear position. The transmission route of the power output by the engine 1 is: transmission shaft 71 → reverse gear drive gear 714 → large tooth of reverse transition double gear 731 → small tooth of reverse transition double gear 731 → reverse gear driven gear 724 → transmission shaft 72.

[0026] The second and third gear engagement sleeve 715 is connected to the hydraulic cylinder. The hydraulic cylinder can drive the second and third gear engagement sleeve 715 to move axially along the transmission shaft 1 71 and engage with the second gear drive gear 712 or the third gear drive gear 713. When the second and third gear engagement sleeve 715 moves to the left and engages with the second gear drive gear 712, it switches to the second gear position. The transmission route of the power output by the engine 1 is: transmission shaft 1 71 → second gear drive gear 712 → second gear driven gear 722 → transmission shaft 2 72. When the second and third gear engagement sleeve 715 moves to the right and engages with the third gear drive gear 713, it switches to the third gear position. The transmission route of the power output by the engine 1 is: transmission shaft 1 71 → third gear drive gear 713 → third gear driven gear 723 → transmission shaft 2 72.

[0027] Specifically, a wheel drive drive gear 726 is fixedly mounted on the second drive shaft 72. The wheel drive drive gear 726 is a bevel gear. The wheel drive drive gear 726 is connected to the wheel drive mechanism, which is connected to the two wheels 88 of the tractor.

[0028] Specifically, the wheel drive mechanism includes a left half-shaft 81, a left half-shaft gear 82, a driven bevel gear 83, a planetary gear shaft 84, a planetary gear 85, a right half-shaft gear 86, and a right half-shaft 87. The driven bevel gear 83 meshes with the wheel drive drive gear 726. The planetary gear 85 is mounted on the planetary gear shaft 84 and can rotate freely. The left half-shaft 81 and the right half-shaft 87 are respectively fitted into the left half-shaft gear 82 and the right half-shaft gear 86 through spline gears. The two sides of the planetary gear 85 mesh with the left half-shaft gear 82 and the right half-shaft gear 86 respectively to form a differential transmission system.

[0029] When this utility model is in use, after the engine 1 starts, it transmits power to the first gear transmission mechanism 3. The power is divided into two parallel paths: one path passes through the hydraulic power transmission device 4, where the hydraulic pump 41 converts the mechanical power into hydraulic power and transmits it to the motor 42; the motor 42 receives the continuously variable hydraulic power and transmits it to the gear ring 61 of the planetary reduction device 6 through the second gear transmission mechanism 5; in practical applications, this enables the tractor to achieve smooth and continuous power output under various complex terrains and operating conditions. The other power path is through clutch 2, which is a wet clutch. Wet clutches can withstand higher torque, ensuring no slippage or power interruption occurs. Power is then transmitted via the second gear transmission mechanism 5 to the sun gear 62 of the planetary reduction gear 6. The two power paths converge at the planetary gear carrier 63, which receives continuously variable hydraulic power from the ring gear 61 and mechanical power from the sun gear 62. The planetary gear carrier 63 then transmits the combined power to the gear shifting device. When shifting gears via pedal or lever, the gear shifting device and clutch 2 are linked to ensure that clutch 2 is disengaged during gear shifting and engaged after shifting. In practical applications, this allows the tractor to flexibly distribute and adjust the power output of each component according to operational needs.

[0030] The aforementioned hydraulic continuously variable transmission (CVT) utilizes a connection structure consisting of a hydraulic power transmission unit 4, a clutch 2, a planetary reduction gear 6, and a gear shifting device. Simultaneously employing hydraulic and mechanical power, it achieves continuous speed changes during gear shifting, meeting the requirements of frequent forward, reverse, and speed adjustments for tractors. Because the CVT provides continuous speed changes and precise direction switching, the tractor performs exceptionally well in agricultural operations. The gear shifting device, linked to the clutch 2, jointly controls the gearbox's shifting, allowing the operator to quickly and smoothly switch gears. The gear shifting device enables stepless control of forward and reverse movements and multiple gears; in practical applications, this significantly improves the tractor's operational convenience and work efficiency. Whether tilling, sowing, or harvesting, the aforementioned hydraulic CVT allows the tractor to achieve maximum efficiency under various operating conditions.

[0031] Any descriptions not covered in the above specific embodiments of this utility model belong to the well-known technology in the field, and can be implemented by referring to the well-known technology.

[0032] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydraulic continuously variable transmission, characterized in that: include: The clutch is used to provide mechanical power to the gearbox. It is a wet clutch that inputs part of the engine power through the first gear transmission mechanism and transmits it to the planetary reduction gear through the second gear transmission mechanism. A hydraulic power transmission device is used to provide continuously variable hydraulic power to the gearbox. It inputs part of the engine power through a first gear transmission mechanism and transmits it to the planetary reduction gear through a second gear transmission mechanism. Planetary reduction gear is used to combine the power of the hydraulic power transmission device and the clutch, and then transmit the power to the gear shifting device. The gear shifting device is used in conjunction with the clutch to control the gearbox shifting, achieving stepless control of each gear. The gear shifting device includes a first drive shaft, a second drive shaft, a reverse gear shaft, a reverse transition double gear rotatably mounted on the reverse gear shaft, a first-gear drive gear, a reverse gear drive gear, a second-gear drive gear, and a third-gear drive gear mounted on the first drive shaft, and a first-gear driven gear, a reverse gear driven gear, a second-gear driven gear, and a third-gear driven gear mounted on the second drive shaft. The first-gear drive gear meshes with the first-gear driven gear, the reverse gear drive gear meshes with the reverse transition double gear, the reverse transition double gear meshes with the reverse gear driven gear, the second-gear drive gear meshes with the second-gear driven gear, and the third-gear drive gear meshes with the third-gear driven gear. A reverse gear engagement sleeve is provided between the first gear driven gear and the reverse gear driven gear, and a second and third gear engagement sleeve is provided between the second gear driving gear and the third gear driving gear. Both the first and reverse gear engagement sleeves and the second and third gear engagement sleeves are connected to the hydraulic cylinder.

2. The hydraulic continuously variable transmission according to claim 1, characterized in that: The first gear transmission mechanism includes gear three connected to the engine, gear one connected to the hydraulic power transmission device, and gear two connected to the clutch.

3. The hydraulic continuously variable transmission according to claim 2, characterized in that: The planetary reduction gear includes a ring gear, a sun gear, and a planetary gear carrier. The ring gear receives continuously variable hydraulic power from the hydraulic power transmission device, and the sun gear receives mechanical power from the clutch. The planetary gear carrier combines continuously variable hydraulic power and mechanical power and transmits the hybrid power to the gear shifting device.

4. The hydraulic continuously variable transmission according to claim 3, characterized in that: The hydraulic power transmission device includes a hydraulic pump and a motor. The hydraulic pump converts the input mechanical power into hydraulic power and transmits it to the motor. The motor converts the hydraulic power output by the hydraulic pump into mechanical power.

5. The hydraulic continuously variable transmission according to claim 4, characterized in that: One end of the drive shaft is connected to the planetary gear carrier of the planetary reduction gear. The first gear drive gear and the reverse gear drive gear are fixedly mounted on the drive shaft, and the second gear drive gear and the third gear drive gear are rotatably mounted on the drive shaft. The second gear driven gear and the third gear driven gear are fixedly mounted on the drive shaft, and the first gear driven gear and the reverse gear driven gear are rotatably mounted on the drive shaft.

6. The hydraulic continuously variable transmission according to claim 5, characterized in that: The reverse gear engagement sleeve is splined onto the second transmission shaft. The reverse gear engagement sleeve is driven by a hydraulic cylinder to move axially along the second transmission shaft and engage with either the first gear driven gear or the reverse gear driven gear. When the reverse gear engagement sleeve moves to the left and engages with the first gear driven gear, it switches to the first gear position; when the reverse gear engagement sleeve moves to the right and engages with the reverse gear driven gear, it switches to the reverse gear position.

7. The hydraulic continuously variable transmission according to claim 6, characterized in that: The second and third gear engagement sleeves are splined and mounted on the first transmission shaft. The second and third gear engagement sleeves are driven by the hydraulic cylinder to move axially along the first transmission shaft and engage with the second or third gear drive gear. When the second and third gear engagement sleeves move to the left and engage with the second gear drive gear, the gear is switched to the second gear position. When the second and third gear engagement sleeve moves to the right and engages with the third gear drive gear, it switches to the third gear position.

8. The hydraulic continuously variable transmission according to claim 1, characterized in that: A wheel drive drive gear is fixedly mounted on the second drive shaft. The wheel drive drive gear is a bevel gear and is connected to the wheel drive mechanism, which is connected to the two wheels of the tractor.

9. The hydraulic continuously variable transmission according to claim 8, characterized in that: The wheel drive mechanism includes a left half-shaft, a left half-shaft gear, a driven bevel gear, a planetary gear shaft, planetary gears, a right half-shaft gear, and a right half-shaft. The driven bevel gear meshes with the wheel drive driving gear. The planetary gears are mounted on the planetary gear shaft and can rotate freely. The left half-shaft and right half-shaft are respectively fitted into the left half-shaft gear and the right half-shaft gear through spline gears. The two sides of the planetary gears mesh with the left half-shaft gear and the right half-shaft gear respectively to form a differential transmission system.

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