Hydraulic mechanical stepless speed change transmission system

Abstract

The invention discloses a hydraulic mechanical stepless speed change transmission system, which relates to the technical field of vehicle transmission, and comprises an input shaft assembly, a hydraulic pump shaft assembly, a hydraulic motor shaft assembly and an output shaft assembly, the hydraulic motor shaft assembly is in transmission connection with the output shaft assembly; a hydraulic pump of the hydraulic pump shaft assembly is in pipeline connection with a hydraulic motor of the hydraulic motor shaft assembly; the whole structure is simple, stepless speed change is achieved through the hydraulic pump and the hydraulic motor, clutches are avoided, gear shifting can be achieved by adjusting the rotating speed and the displacement of the hydraulic pump and the hydraulic motor, stepless speed regulation and continuous reversing can be achieved according to driving requirements, gear shifting impact is avoided, controllability is good, and therefore the working efficiency is improved; and hydraulic and mechanical power coupling is carried out on the hydraulic motor shaft assembly, pure mechanical transmission can be achieved by adjusting the displacement of the hydraulic pump and the displacement of the hydraulic motor, and the transmission efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle transmission, and in particular to a hydraulic mechanical continuously variable transmission system. Background Art

[0002] In order to improve the safety and reliability of use, hydraulic transmission and power shift transmission are generally used in domestic medium and large loaders and graders. However, the driving mode of hydraulic transmission and power shift transmission currently used has the problems of low transmission efficiency, low working efficiency, high energy consumption and difficulty in meeting emission standards. In order to solve this problem, some loaders adopt electric transmission solutions, but the electric transmission solution is not only costly, but also limited in usage scenarios, making it difficult to promote in the market.

[0003] Therefore, people are in urgent need of a hydraulic mechanical continuously variable transmission system with high transmission efficiency and high working efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic mechanical continuously variable transmission system to solve the problems existing in the above-mentioned prior art. By realizing continuously variable speed change through a hydraulic pump and a hydraulic motor, stepless speed regulation and continuous reversing can be achieved according to driving requirements, without gear shifting shock, and with good controllability, thereby improving work efficiency. In addition, hydraulic and mechanical power coupling is performed on the hydraulic motor shaft assembly to realize pure mechanical transmission and improve transmission efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a hydraulic mechanical continuously variable transmission system, comprising an input shaft assembly, a hydraulic pump shaft assembly, a hydraulic motor shaft assembly and an output shaft assembly, wherein the input shaft assembly is respectively transmission-connected to the hydraulic pump shaft assembly and the hydraulic motor shaft assembly, the hydraulic motor shaft assembly is transmission-connected to the output shaft assembly, and the hydraulic pump of the hydraulic pump shaft assembly is connected to the hydraulic motor pipeline of the hydraulic motor shaft assembly.

[0006] Preferably, transmission is performed between the input shaft assembly and the hydraulic pump shaft assembly, between the input shaft assembly and the hydraulic motor shaft assembly, and between the hydraulic motor shaft assembly and the output shaft assembly via gears.

[0007] Preferably, the input shaft assembly includes an input shaft and a planetary transmission mechanism, the planetary transmission mechanism includes a planetary carrier, planetary gears, an inner ring gear and a sun gear, the input shaft is transmission-connected to the planetary carrier, the planetary gears are respectively meshed with the sun gear and the inner ring gear, the inner ring gear is tooth-transmission-connected to the hydraulic motor shaft assembly, and the sun gear is tooth-transmission-connected to the hydraulic motor shaft assembly.

[0008] Preferably, the hydraulic pump assembly comprises a hydraulic shaft, the hydraulic pump and a hydraulic shaft driven gear, the hydraulic shaft is meshed and driven with the inner gear ring through the hydraulic shaft driven gear, and the hydraulic shaft is drivingly connected to the hydraulic pump.

[0009] Preferably, the hydraulic motor shaft assembly includes the hydraulic motor, a motor shaft, a motor shaft passive gear and a motor shaft driving gear, the motor shaft is meshed and driven with the sun gear through the motor shaft passive gear, the motor shaft is transmission connected to the output shaft assembly through the motor shaft driving gear, and the motor shaft is transmission connected to the hydraulic motor.

[0010] Preferably, the hydraulic motor shaft assembly is provided with two hydraulic motors, and the two hydraulic motors can be used synchronously or alternately.

[0011] Preferably, the output shaft assembly includes an output shaft and an output shaft driven gear, and the output shaft is meshed and driven with the motor shaft driving gear through the output shaft driven gear.

[0012] Preferably, the hydraulic mechanical continuously variable transmission system further comprises a PTO shaft assembly, and the PTO shaft assembly is drivingly connected to the input shaft assembly.

[0013] Preferably, the input shaft assembly includes an input shaft driving gear arranged on the input shaft, and the PTO shaft assembly includes a PTO shaft and a PTO shaft passive gear, and the PTO shaft passive gear is meshed with the input shaft driving gear for transmission.

[0014] Preferably, the hydraulic mechanical continuously variable transmission system further comprises an automatic transmission control unit for controlling the variable change and the variable change speed of the hydraulic pump and the hydraulic motor.

[0015] Compared with the prior art, the present invention mainly achieves the following technical effects:

[0016] The overall structure is simple, and stepless speed change is achieved through a hydraulic pump and a hydraulic motor. There is no clutch, and gear shifting can be achieved by adjusting the speed and displacement of the hydraulic pump and the hydraulic motor. Stepless speed regulation and continuous reversing can be achieved according to driving needs, without gear shifting shock and good controllability, thereby improving work efficiency. Hydraulic and mechanical power coupling is performed on the hydraulic motor shaft assembly, and pure mechanical transmission can be achieved by adjusting the hydraulic pump and the displacement of the hydraulic motor, thereby improving transmission efficiency.

[0017] Compared with the prior art, other solutions of the present invention have achieved the following technical effects:

[0018] Two hydraulic motors are set up. When the forward and reverse vehicle speeds are high, one motor can be used alternately to extend the life of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the hydraulic mechanical continuously variable transmission system of the present invention;

[0021] Among them, 1. input shaft; 2. planetary carrier; 3. planetary gear; 4. inner ring gear; 5. sun gear; 6. hydraulic shaft; 7. hydraulic pump; 8. hydraulic shaft passive gear; 9. hydraulic motor; 10. motor shaft; 11. motor shaft passive gear; 12. motor shaft driving gear; 13. output shaft; 14. output shaft passive gear; 15. PTO shaft; 16. PTO shaft passive gear; 17. input shaft driving gear. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a hydraulic mechanical continuously variable transmission system to solve the problems existing in the prior art. By realizing continuously variable speed change through a hydraulic pump and a hydraulic motor, stepless speed regulation and continuous reversing can be achieved according to driving requirements, without gear shifting shock, and with good controllability, thereby improving work efficiency. In addition, hydraulic and mechanical power coupling is performed on the hydraulic motor shaft assembly to realize pure mechanical transmission and improve transmission efficiency.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Please refer to Figure 1As shown, a hydraulic mechanical continuously variable transmission system is provided, including an input shaft assembly, a hydraulic pump shaft assembly, a hydraulic motor shaft assembly and an output shaft assembly. The input shaft assembly is respectively connected to the hydraulic pump shaft assembly and the hydraulic motor shaft assembly in a transmission manner, the hydraulic motor shaft assembly is connected to the output shaft assembly in a transmission manner, the hydraulic pump 7 of the hydraulic pump shaft assembly is connected to the hydraulic motor 9 of the hydraulic motor shaft assembly by pipeline, and the motion transmission path of the system is: the input shaft assembly receives the motion transmitted by the engine, and transmits the motion to the hydraulic pump shaft assembly to drive the hydraulic pump 7, while the hydraulic pump 7 transmits the motion to the hydraulic motor shaft assembly by hydraulic transmission, and the input shaft assembly directly transmits the motion to the hydraulic motor shaft assembly. Then it is transmitted to the hydraulic motor shaft assembly in the form of mechanical transmission, and finally the hydraulic motor shaft assembly transmits the motion to the output shaft assembly, and the output shaft assembly transmits the motion to the front and rear drive axles; the overall structure of this system is simple, and stepless speed change is achieved through the hydraulic pump 7 and the hydraulic motor 9. There is no clutch, and gears can be shifted by adjusting the speed and displacement of the hydraulic pump 7 and the hydraulic motor 9. It can achieve stepless speed regulation and continuous reversing according to driving needs, without gear shifting shock, and has good controllability, thereby improving work efficiency, and hydraulic and mechanical power coupling is performed on the hydraulic motor shaft assembly. Pure mechanical transmission can be achieved by adjusting the displacement of the hydraulic pump 7 and the hydraulic motor 9, thereby improving transmission efficiency.

[0026] The unit for controlling the variable change and the variable change speed of the hydraulic pump 7 and the hydraulic motor 9 is an automatic transmission control unit (TCU).

[0027] In this embodiment, transmission is carried out between the input shaft assembly and the hydraulic pump shaft assembly, between the input shaft assembly and the hydraulic motor shaft assembly, and between the hydraulic motor shaft assembly and the output shaft assembly through gears.

[0028] In this embodiment, the input shaft assembly includes an input shaft 1 and a planetary transmission mechanism, which includes a planetary carrier 2, planetary gears 3, an inner ring gear 4 and a sun gear 5. The input shaft 1 is transmission-connected to the planetary carrier 2 to drive the planetary gears 3 to move. The planetary gears 3 are respectively meshed with the sun gear 5 and the inner ring gear 4 to drive the sun gear 5 and the inner ring gear 4 to move. The inner ring gear 4 is transmission-connected to the hydraulic motor shaft assembly, the sun gear 5 is transmission-connected to the hydraulic motor shaft assembly, and the input shaft 1 is transmission-connected to the engine.

[0029] In this embodiment, the hydraulic pump 7 assembly includes a hydraulic shaft 6, a hydraulic pump 7 and a hydraulic shaft driven gear 8. The hydraulic shaft 6 is meshed with the inner gear ring 4 through the hydraulic shaft driven gear 8. The hydraulic shaft 6 is connected to the hydraulic pump 7 in a transmission connection. When the inner gear ring 4 moves, the movement can be transmitted to the hydraulic shaft 6 through the hydraulic shaft driven gear 8, thereby driving the hydraulic pump 7 to move.

[0030] In this embodiment, the hydraulic motor shaft assembly includes a hydraulic motor 9, a motor shaft 10, a motor shaft driven gear 11 and a motor shaft driving gear 12. The motor shaft 10 is meshed with the sun gear 5 through the motor shaft driven gear 11 to receive the movement from the sun gear 5 in a mechanical transmission manner. The motor shaft 10 is transmission-connected to the output shaft assembly through the motor shaft driving gear 12. The motor shaft 10 is transmission-connected to the hydraulic motor 9 to receive the movement transmitted by the hydraulic pressure from the hydraulic pump 7.

[0031] The rotation speed of the sun gear 5 is greater than the rotation speed of the motor shaft driven gear 11 to achieve high torque output and improve power performance. The rotation speed of the inner ring 4 is greater than the rotation speed of the hydraulic shaft driven gear 8 to improve power output torque.

[0032] The hydraulic motor shaft assembly is provided with two hydraulic motors 9, and the two hydraulic motors 9 can be used synchronously or alternately. When the forward and reverse vehicle speeds are relatively high, the two hydraulic motors 9 can be used alternately to extend the life of the gearbox.

[0033] In this embodiment, the output shaft assembly includes an output shaft 13 and an output shaft driven gear 14. The output shaft 13 is meshed and driven with the motor shaft driving gear 12 through the output shaft driven gear 14. The output shaft 13 is drivingly connected to the front and rear drive axles.

[0034] The hydraulic mechanical continuously variable transmission system also includes a PTO shaft assembly (PTO, auxiliary power output), which is drivingly connected to the input shaft assembly.

[0035] In this embodiment, the specific transmission connection method between the PTO shaft assembly and the input shaft assembly is: the input shaft assembly also includes an input shaft driving gear 17 arranged on the input shaft 1, the PTO shaft assembly includes a PTO shaft 15 and a PTO shaft passive gear 16, and the PTO shaft passive gear 16 is meshed with the input shaft driving gear 17 for transmission.

[0036] In this embodiment, the hydraulic pump 7 is a closed swash plate variable displacement piston pump, and the hydraulic motor 9 is a bent axis variable displacement piston motor.

[0037] In actual use, when the hydraulic pump 7 has zero displacement and the two hydraulic motors 9 have maximum displacement, there is no power output and it is neutral; when the hydraulic pump 7 has positive displacement, the two hydraulic motors 9 rotate forward and have a large displacement, it is suitable for heavy-load and low-speed driving, and the power output is low-speed and heavy-load forward; when the hydraulic pump 7 has positive displacement and the displacement gradually increases, the two hydraulic motors 9 rotate forward and the displacement gradually decreases, the vehicle speed gradually increases, and the power output is high-speed forward; when the hydraulic pump 7 has positive displacement and the displacement is maximum, and the two hydraulic motors 9 have zero displacement, the vehicle speed reaches the maximum, and the hydraulic transmission power is zero, and the power output is pure mechanical transmission forward; when the hydraulic pump 7 has negative displacement, the two hydraulic motors 9 reverse and have a large displacement, it is suitable for heavy-load and low-speed driving, and the power output is low-speed and heavy-load backward; when the hydraulic pump 7 has negative displacement and the displacement gradually increases, the two hydraulic motors 9 reverse and the displacement gradually decreases, the vehicle speed gradually increases, and the power output is high-speed backward.

[0038] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0039] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0040] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hydraulic mechanical continuously variable transmission system, characterized in that: It includes an input shaft assembly, a hydraulic pump shaft assembly, a hydraulic motor shaft assembly and an output shaft assembly. The input shaft assembly is respectively connected to the hydraulic pump shaft assembly and the hydraulic motor shaft assembly in a transmission manner. The hydraulic motor shaft assembly is connected to the output shaft assembly in a transmission manner. The hydraulic pump of the hydraulic pump shaft assembly is connected to the hydraulic motor pipeline of the hydraulic motor shaft assembly.

2. The hydraulic mechanical continuously variable transmission system according to claim 1, characterized in that: Transmission is carried out between the input shaft assembly and the hydraulic pump shaft assembly, between the input shaft assembly and the hydraulic motor shaft assembly, and between the hydraulic motor shaft assembly and the output shaft assembly through gears.

3. The hydraulic mechanical continuously variable transmission system according to claim 2, characterized in that: The input shaft assembly includes an input shaft and a planetary transmission mechanism, and the planetary transmission mechanism includes a planetary carrier, planetary gears, an inner ring gear and a sun gear. The input shaft is connected to the planetary carrier in a transmission manner, and the planetary gears are respectively meshed with the sun gear and the inner ring gear for transmission. The inner ring gear is connected to the hydraulic motor shaft assembly in a gear transmission manner, and the sun gear is connected to the hydraulic motor shaft assembly in a gear transmission manner.

4. The hydraulic mechanical continuously variable transmission system according to claim 3, characterized in that: The hydraulic pump assembly comprises a hydraulic shaft, the hydraulic pump and a hydraulic shaft driven gear. The hydraulic shaft is meshed and driven with the inner gear ring through the hydraulic shaft driven gear. The hydraulic shaft is in driving connection with the hydraulic pump.

5. The hydraulic mechanical continuously variable transmission system according to claim 3, characterized in that: The hydraulic motor shaft assembly includes the hydraulic motor, a motor shaft, a motor shaft passive gear and a motor shaft driving gear. The motor shaft is meshed and driven with the sun gear through the motor shaft passive gear. The motor shaft is drivingly connected to the output shaft assembly through the motor shaft driving gear. The motor shaft is drivingly connected to the hydraulic motor.

6. The hydraulic mechanical continuously variable transmission system according to claim 5, characterized in that: The hydraulic motor shaft assembly is provided with two hydraulic motors, and the two hydraulic motors can be used synchronously or alternately.

7. The hydraulic mechanical continuously variable transmission system according to claim 5, characterized in that: The output shaft assembly includes an output shaft and an output shaft driven gear, and the output shaft is meshed and driven with the motor shaft driving gear through the output shaft driven gear.

8. The hydraulic mechanical continuously variable transmission system according to claim 1, characterized in that: The hydraulic mechanical continuously variable transmission system further comprises a PTO shaft assembly, which is drivingly connected to the input shaft assembly.

9. The hydraulic mechanical continuously variable transmission system according to claim 8, characterized in that: The input shaft assembly includes an input shaft driving gear arranged on the input shaft, and the PTO shaft assembly includes a PTO shaft and a PTO shaft passive gear, and the PTO shaft passive gear is meshed with the input shaft driving gear for transmission.

10. The hydraulic mechanical continuously variable transmission system according to claim 1, characterized in that: The hydraulic mechanical continuously variable transmission system further includes an automatic transmission control unit for controlling the variable changes and variable change speeds of the hydraulic pump and the hydraulic motor.

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