Hydraulic mechanical stepless speed change tractor chassis

Abstract

The utility model relates to the technical field of stepless speed change, and discloses a hydraulic mechanical stepless speed change tractor chassis, which solves the problem that mechanical and hydraulic confluence can not be realized for stepless speed change at present, and comprises an HST, one side of the HST is connected with a power coupling unit, one side of the power coupling unit is connected with a PTO moisture clutch, and the other side of the power coupling unit is connected with a hydraulic clutch. One side of the PTO moisture clutch is connected with a gear shift, and one side of the gear shift is connected with a PTO gear; according to the utility model, through the cooperation between the HST and the power coupling unit, the power directly transmitted by the engine and the power transmitted by the HST can be conveniently coupled, and stepless speed change can be realized, so that the HST mainly plays a role of walking stepless speed change, and the service life of the HST can be effectively prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of continuously variable transmission (CVT) technology, specifically a hydraulic mechanical CVT tractor chassis. Background Technology

[0002] The tractor chassis is an important component of the tractor. It supports the entire vehicle body and carries various working devices. The transmission system used in the tractor chassis is a key component of its transmission system, which allows the driver to adjust the speed and torque of the tractor according to the needs of the operation and driving conditions.

[0003] In existing technologies, mechanical shifting and hydraulic shifting are generally used. Pure mechanical shifting cannot achieve continuously variable transmission, while pure hydraulic shifting has low efficiency. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, this utility model provides a hydraulic mechanical continuously variable transmission tractor chassis, which effectively solves the problem that it is currently impossible to achieve the merging of mechanical and hydraulic systems for continuously variable transmission.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic mechanical continuously variable transmission tractor chassis, including an HST, a power coupling unit connected to one side of the HST, a PTO wet clutch connected to one side of the power coupling unit, a gearbox connected to one side of the PTO wet clutch, and a PTO gear connected to one side of the gearbox.

[0006] Preferably, the HST includes a variable pump and a fixed displacement motor.

[0007] Preferably, the power coupling unit includes a sun gear, a ring gear, and a planet carrier.

[0008] Preferably, the gears include auxiliary gear A, auxiliary gear B, auxiliary gear C, and auxiliary gear D.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. This utility model, through the cooperation between HST and power coupling unit, facilitates the coupling of power directly transmitted from the engine with power transmitted from HST, enabling continuously variable transmission (CVT). This allows HST to primarily undertake the function of continuously variable transmission during travel, effectively improving the service life of HST.

[0011] 2. This new type of transmission facilitates the realization of four power ranges for continuously variable transmission through the coordination between auxiliary transmission A and B gears, as well as auxiliary transmission C and D gears, thus making it more widely applicable. Attached Figure Description

[0012] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0013] In the attached diagram:

[0014] Figure 1 This is a schematic diagram of the continuously variable transmission structure of the hydraulic machinery of this utility model.

[0015] In the diagram: 1. HST; 101. Variable pump; 102. Fixed displacement motor; 2. Power coupling unit; 201. Sun gear; 202. Ring gear; 203. Planetary carrier; 3. PTO wet clutch; 4. Auxiliary transmission A gear; 5. Auxiliary transmission B gear; 6. Auxiliary transmission C gear; 7. Auxiliary transmission D gear; 8. PTO gear. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] Example 1, by Figure 1 This utility model relates to a hydraulic mechanical continuously variable transmission (CVT) tractor chassis, including an HST1. A power coupling unit 2 is connected to one side of the HST1, a PTO wet clutch 3 is connected to one side of the power coupling unit 2, a gear shifter is connected to one side of the PTO wet clutch 3, and a PTO gear 8 is connected to one side of the gear shifter. The HST1 includes a variable pump 101 and a fixed displacement motor 102. The HST1 is a hydraulic continuously variable transmission system. The power coupling unit 2 includes a sun gear 201, a ring gear 202, and a planetary carrier 203. The PTO wet clutch 3 allows the output to be switched on and off electronically via a switch or a handle, reducing workload.

[0018] The engine's power is supplied to the variable pump 101, which outputs a portion of the power to the mechanical gearbox and another portion to the fixed displacement motor 102. The fixed displacement motor 102 then outputs the power to the power coupling unit 2, where the power is coupled. Finally, the power is output through the power coupling unit 2. The total output power includes the power directly from the engine and the power transmitted from HST1, achieving continuously variable transmission (CVT). This reduces the pressure on HST1, allowing it to primarily perform the function of continuously variable transmission for driving, effectively improving the service life of HST1.

[0019] Specifically, by Figure 1 The transmission gears are given as follows: A gear 4, B gear 5, C gear 6, and D gear 7.

[0020] The system is equipped with four gears: A gear 4, B gear 5, C gear 6, and D gear 7, which provide four power ranges for continuously variable transmission (CVT) and improve its applicability.

Claims

1. A hydraulic mechanical continuously variable transmission tractor chassis, comprising HST(1), characterized in that: The HST (1) is connected to a power coupling unit (2) on one side, and a PTO wet clutch (3) is connected to one side of the power coupling unit (2). A gear shifter is connected to one side of the PTO wet clutch (3), and a PTO gear (8) is connected to one side of the gear shifter.

2. The hydraulic mechanical continuously variable transmission tractor chassis according to claim 1, characterized in that: The HST (1) includes a variable pump (101) and a fixed displacement motor (102).

3. The hydraulic mechanical continuously variable transmission tractor chassis according to claim 1, characterized in that: The power coupling unit (2) includes a sun gear (201), a gear ring (202), and a planet carrier (203).

4. The hydraulic mechanical continuously variable transmission tractor chassis according to claim 1, characterized in that: The gears include auxiliary gear A (4), auxiliary gear B (5), auxiliary gear C (6), and auxiliary gear D (7).

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