Double-HST transmission case structure of crawler tractor

Abstract

The utility model discloses a double-HST transmission case structure of a crawler tractor, which relates to the field of tractor transmission and comprises a transmission case shell, a power input part is arranged at the front end of the transmission case shell, and a sun wheel shaft and a power output part are arranged at the tail end of the transmission case shell. Planetary gear train mechanisms are arranged on the left side and the right side of the sun wheel shaft in a stacked mode, a walking transmission assembly and a steering assembly are arranged in the transmission case shell, and the walking transmission assembly is arranged in the transmission case shell and used for adjusting the rotating speed of the sun wheel shaft. Compared with a traditional crawler transmission system, the double-HST transmission case structure of the crawler tractor has the advantage of hydraulic and mechanical walking power switching, high efficiency of mechanical power and flexibility of hydraulic power are combined, the hydraulic planet differential steering technology is integrated, and compared with a traditional steering clutch gearbox, the double-HST transmission case structure of the crawler tractor has the advantages that no quick-wear part exists in the system, and the system is more stable and reliable. The system is long in service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to tractor drive technology field, concretely is a kind of double HST transmission case structure of tracked tractor. BACKGROUND

[0002] Tractor as a common agricultural production machinery, can effectively improve agricultural work efficiency, transmission case as the important component of tractor, plays the function of controlling tractor output power.

[0003] Prior art 1 (application number 202223564636.8, China patent published on June 6, 2023) a kind of tractor gearbox with HST, including sequentially connected HST transmission mechanism, main transmission mechanism, high-low gear mechanism, high-low gear mechanism is set to the rear side of main transmission mechanism, four speed gears in main transmission mechanism are adjusted, output eight different speed gears;HST is installed at the front side of main transmission mechanism, is connected with the power input shaft in gearbox by HST power output shaft, the power of engine is transmitted to power output mechanism;HST drive output shaft is connected with the inner spline of always meshing driving gear, and driving force is transmitted to driving output mechanism, the gearbox structure provided by the scheme is simple, HST transmission mechanism is combined with the above two transmission mechanisms, can complete the output of eight forward gears and eight reverse gears, improve the operation ability of tractor;Prior art 2 (application number 201910359581.0, China patent published on May 1, 2020) a kind of tracked vehicle variable speed transmission equipment, the tracked vehicle variable speed transmission equipment includes box body assembly, transmission assembly, differential steering assembly, main reducer assembly and PTO variable speed component composition. Among them, transmission assembly, differential steering assembly, main reducer assembly, PTO variable speed component are installed on box body assembly, transmission assembly has high-speed four gears and low-speed four gears, differential steering assembly adopts HST to directly control worm, worm adjusts the worm wheel of two sides differential device to realize vehicle steering, main reducer assembly has main reduction effect, also has the switching forward and reverse effect, cooperates with transmission assembly, realizes forward 8 speed and reverse 8 speed combination, the utility model adopts combined gear shifting, gear position is more, and the matching performance with agricultural implement is good, adopts HST direct connection control tracked vehicle steering, with the advantages of simple structure, high steering precision, steering instantaneous rate adjustable and the like.

[0004] The transmission case of the prior art directly through mechanical transmission, although it has high transmission efficiency, but poor flexibility, the flexibility is improved by using hydraulic transmission, but the transmission efficiency will decrease, due to the setting of internal vulnerable parts, the service life of system is lower and other use deficiencies. UTILITY MODEL CONTENTS

[0005] The utility model discloses a purpose lies in providing a kind of tracked tractor double HST transmission case structure, to solve the direct transmission case of current transmission of above-mentioned background art, although it has higher transmission efficiency, but flexibility is poor, the flexibility of using hydraulic transmission is improved, but transmission efficiency will decline, the setting of internal vulnerable parts leads to the problem of lower system service life.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of tracked tractor double HST transmission case structure, including transmission case shell, the front end of the transmission case shell is provided with power input part, the tail end of the transmission case shell is provided with sun gear shaft and power output part, the left and right sides of the sun gear shaft are stacked and are provided with planetary gear train mechanism, the inside of the transmission case shell is provided with travel transmission assembly and steering assembly, the travel transmission assembly is arranged in the inside of transmission case shell, for adjusting the rotational speed of sun gear shaft, the side wall of the transmission case shell is provided with HST1 matched with the travel transmission assembly, the steering assembly is arranged in the inside of transmission case shell, and the outer wall of transmission case shell is provided with HST2 matched with the steering assembly.

[0007] Further optimize the technical scheme, the HST1 and HST2 are all split type structure design.

[0008] Further optimize the technical scheme, the HST1 and HST2 all include variable pump and hydraulic motor, and the variable pump and hydraulic motor are connected with each other.

[0009] Further optimize the technical scheme, the power input part is diesel engine, and provides power input for transmission system.

[0010] Further optimize the technical scheme, the rear side of the power input part is provided with input shaft, and the front end of the input shaft is provided with clutch, and the power input part is connected with the input shaft through the clutch.

[0011] Further optimize the technical scheme, the outside of the input shaft is provided with first transmission gear, and the input shaft transmits power to HST1 and HST2 through the first transmission gear.

[0012] Further optimize the technical scheme, the rear side of the first transmission gear is provided with mechanical gear, power gear and HST gear.

[0013] Further optimize the technical scheme, the hydraulic motor in the HTS1 is connected with HST output shaft, and the HST output shaft is connected with small bevel pinion pair, and the small bevel pinion pair is connected with the input shaft.

[0014] Further optimize the technical scheme, the rear side of the small bevel pinion pair is sequentially provided with high gear and low gear.

[0015] Further optimization of the technical scheme, the outer side of the sun gear shaft is provided with a second transmission gear.

[0016] Compared with the prior art, the utility model has the advantages that compared with the traditional track transmission system, the utility model has the advantages of hydraulic and mechanical walking power switching, so that the high efficiency of mechanical power and the flexibility of hydraulic power are combined, the hydraulic planetary differential steering technology is integrated, the system does not have a wearing part, the system has a long service life, and the steering precision is high. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the transmission structure principle of the utility model.

[0018] In the figure: 1, power input part;2, input shaft;3, clutch;4, first transmission gear;5, variable pump;6, hydraulic motor;7, mechanical gear;8, power gear;9, HST gear;10, HST output shaft;11, small bevel gear pair;12, high gear;13, low gear;14, second transmission gear;15, sun gear shaft;16, planetary gear mechanism. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0020] Please refer to Figure 1 The utility model provides the following technical scheme: a track tractor double HST transmission box structure, including transmission box shell body;

[0021] Embodiment one: the utility model provides a technical scheme, discloses the front end of transmission box shell body is provided with power input part 1, and the tail end of transmission box shell body is provided with sun gear shaft 15 and power output part, and the left and right sides of sun gear shaft 15 are provided with planetary gear mechanism 16, and transmission box shell body is provided with walking transmission assembly and steering assembly in the inside, walking transmission assembly is arranged in the inside of transmission box shell body and is used for adjusting the rotating speed of sun gear shaft 15, and the side wall of transmission box shell body is provided with HST 1 that cooperates with the walking transmission assembly, and steering assembly is arranged in the inside of transmission box shell body, and the outer wall of transmission box shell body is provided with HST 2 that cooperates with the steering assembly.

[0022] The structure has the advantages of hydraulic and mechanical walking power switching, so that the high efficiency of mechanical power and the flexibility of hydraulic power are combined, and the hydraulic planetary differential steering technology is integrated, so that no easy-to-damage part is arranged in the system compared with a traditional steering clutch gearbox.

[0023] In the embodiment one, the power input part 1 is a diesel engine, and provides power input for the transmission system.

[0024] The power input part 1 formed by the diesel engine transmits power to the input shaft 2, drives the first transmission gear 4, and the first transmission gear 4 drives the two variable pumps 5 in the transmission case shell left and right.

[0025] The contents not described in detail in the specification belong to the prior art known by the person skilled in the art.

[0026] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A dual HST transmission box structure for a tracked tractor, comprising a transmission box housing; Its features are: The front end of the transmission housing is provided with a power input section (1), the rear end of the transmission housing is provided with a sun gear shaft (15) and a power output section, and planetary gear trains (16) are arranged on the left and right sides of the sun gear shaft (15). The transmission housing is provided with a walking transmission assembly and a steering assembly. The walking transmission assembly is located inside the transmission housing and is used to adjust the rotational speed of the sun gear shaft (15). The side wall of the transmission housing is provided with an HST1 that cooperates with the walking transmission assembly. The steering assembly is located inside the transmission housing, and the outer wall of the transmission housing is provided with an HST2 that cooperates with the steering assembly.

2. The dual HST transmission box structure for a tracked tractor according to claim 1, characterized in that: Both HST1 and HST2 are designed as separate structures.

3. The dual HST transmission box structure for a tracked tractor according to claim 2, characterized in that: Both HST1 and HST2 include a variable pump (5) and a hydraulic motor (6), which are interconnected.

4. The dual HST transmission box structure for a tracked tractor according to claim 1, characterized in that: The power input unit (1) is a diesel engine that provides power input to the transmission system.

5. The dual HST transmission box structure for a tracked tractor according to claim 1, characterized in that: The power input unit (1) has an input shaft (2) on its rear side, and a clutch (3) is provided at the front end of the input shaft (2). The power input unit (1) is connected to the input shaft (2) through the clutch (3).

6. The dual HST transmission box structure for a tracked tractor according to claim 5, characterized in that: The input shaft (2) is provided with a first transmission gear (4) on its outer side, and the input shaft (2) transmits power to HST1 and HST2 through the first transmission gear (4).

7. The dual HST transmission box structure for a tracked tractor according to claim 6, characterized in that: The rear side of the first transmission gear (4) is provided with a mechanical gear (7), a power gear (8) and an HST gear (9).

8. The dual HST transmission box structure for a tracked tractor according to claim 7, characterized in that: The hydraulic motor (6) inside the HTS1 is connected to the HST output shaft (10), and a small bevel gear pair (11) is connected to the HST output shaft (10). The small bevel gear pair (11) is connected to the input shaft (2).

9. The dual HST transmission box structure for a tracked tractor according to claim 8, characterized in that: The rear side of the small bevel gear pair (11) is provided with a high gear (12) and a low gear (13).

10. The dual HST transmission box structure for a tracked tractor according to claim 9, characterized in that: A second transmission gear (14) is provided on the outer side of the sun gear shaft (15).

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