Transmission structure of tractor gearbox

Abstract

The utility model discloses a tractor gearbox transmission structure which is mainly composed of a hydraulic oil way system, a transmission mechanism and a box body. The hydraulic oil way system is divided into a working oil way and a lubricating oil way and controls the transmission mechanism to work. The transmission mechanism comprises a high-speed gear, a low-speed gear, a reverse gear and an output transmission mechanism which are all installed in the box body. The high-speed gear transmission mechanism and the low-speed gear transmission mechanism achieve transmission through a first clutch, a second clutch and a gear respectively, and the low-speed gear is connected with the high-speed gear through an intermediate transition mechanism (comprising a first transition gear and a second transition gear). The reverse gear mechanism comprises a second transmission shaft, a driven gear, a third clutch and a third gear, is connected with the first transmission shaft through the driving gear and is meshed with the second transition gear of the middle transition mechanism through the third gear to achieve reverse gear transmission. The output transmission mechanism is composed of an input shaft and an output shaft, the input shaft is fixedly connected with a first gear of a high-speed gear, the output shaft is in transmission with the input shaft through a gear mechanism, and finally power is transmitted to wheels.

Description

TECHNICAL FIELD

[0001] The utility model relates to a transmission structure of tractor gearbox. BACKGROUND

[0002] The main working principle of power shift gearbox is to use friction clutch (mostly wet type, multi-plate structure) as the load shift mechanism of power shift execution element to realize. In the shift process, the slip control of clutch will continuously transmit power, ensure that the power will not be interrupted in the conversion process of transmission ratio, thereby reducing the shift time and improving the shift quality.

[0003] The existing gearbox adopts four wet clutches and auxiliary gear configuration meshing sleeve, and realizes the uninterrupted shift operation of transmission through the hydraulic control system. But the existing power shift gearbox has certain defects, and its main deficiency is complex structure, for example, four wet clutches are needed to control the power shift of four gears, which is complex in manufacturing, high in cost and long in axial dimension. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the above technical problems, and provides a transmission structure of tractor gearbox.

[0005] A transmission structure of tractor gearbox, including hydraulic oil circuit system, transmission mechanism, box, the hydraulic oil circuit system includes working oil circuit and lubricating oil circuit, the working oil circuit system is used for controlling transmission mechanism work, the transmission mechanism is installed in the box, the transmission mechanism includes high speed gear transmission mechanism, low speed gear transmission mechanism, reverse gear transmission mechanism, output transmission mechanism;

[0006] The high speed gear transmission mechanism includes first transmission shaft, the first transmission shaft is coaxially provided with first gear and first clutch, the first gear is rotatably connected with the first transmission shaft, and the first clutch includes a first part and a second part, the first part is fixedly connected with the first transmission shaft, and the second part is fixedly connected with the first gear;

[0007] The low speed gear transmission mechanism includes second gear and second clutch which are coaxially arranged on the first transmission shaft, the second gear is rotatably connected with the first transmission shaft, and the second clutch includes a first part and a second part, the first part is fixedly connected with the first transmission shaft, and the second part is fixedly connected with the second gear,

[0008] The second gear and the first gear are driven through intermediate transition mechanism, and the intermediate transition mechanism includes intermediate transition shaft, the intermediate transition shaft is coaxially provided with first transition gear and second transition gear, the first transition gear is engaged with the second gear, and the second transition gear is engaged with the first gear;

[0009] The reverse gear comprises a second transmission shaft, a driven gear, a third clutch and a third gear, the driven gear is engaged with a driving gear, the driving gear is fixedly and coaxially installed on the first transmission shaft, the third gear is rotationally connected with the second transmission shaft, the third gear is engaged with a second transition gear, the third clutch comprises a first part and a second part, the first part is fixedly connected with the second transmission shaft, and the second part is fixedly connected with the third gear.

[0010] The output transmission mechanism comprises an input shaft and an output shaft, the input shaft is fixedly connected with the first gear, the output shaft is transmissionally connected with the input shaft through a gear mechanism, and the output shaft is used for transmitting power to wheels.

[0011] In the embodiment, the second transmission shaft is located at the side of the first transmission shaft, the output shaft is located below the first transmission shaft, and the intermediate transition shaft is located below the first transmission shaft and the second transmission shaft.

[0012] In the embodiment, the first transmission shaft is rotationally connected with the first gear and the second gear through a first bearing, and the second transmission shaft is rotationally connected with the third gear through a first bearing.

[0013] In the embodiment, the intermediate transition shaft, the first transmission shaft and the second transmission shaft are installed in the box through a second bearing.

[0014] In the embodiment, the first transmission shaft is provided with a sealing ring between the first transmission shaft and the first part of the first clutch and the second clutch, and the second transmission shaft is provided with a sealing ring between the second transmission shaft and the first part of the third clutch.

[0015] In the embodiment, the front end of the first transmission shaft is sleeved with a shock absorber through a spline structure, and the shock absorber is provided with a sealing ring between the shock absorber and the first transmission shaft.

[0016] In the embodiment, the first transmission shaft and the second transmission shaft are both installed in an end cover, the end cover is installed in a pre-set inner hole in the box, and the end cover is provided with a sealing ring between the end cover and the inner wall of the inner hole, between the end cover and the first transmission shaft and between the end cover and the second transmission shaft.

[0017] In the embodiment, the end cover is fixedly connected with the box through bolts.

[0018] Advantages: Compared with the prior art, the utility model has the following advantages:

[0019] The independent control of the working oil circuit and the lubricating oil circuit through the hydraulic oil circuit system ensures the efficient and stable operation of the transmission mechanism.

[0020] The design of the first clutch and the second clutch allows the first gear and the second gear to be separated or combined with the first transmission shaft respectively, thereby realizing the switching of gears. The application of the third clutch allows the reverse transmission mechanism to work independently of other gears, increasing the flexibility of operation.

[0021] Through the design of the intermediate transition shaft and the transition gears, smooth transition between low-speed gears and high-speed gears is realized, improving transmission efficiency. At the same time, this design also allows the reverse gear to smoothly access the transmission system without interfering with the normal operation of other gears.

[0022] The second transmission shaft is located to the side of the first transmission shaft, the output shaft is located below the first transmission shaft, and the intermediate transition shaft is located below them. This layout is not only compact but also optimizes space utilization.

[0023] The application of bearings and sealing rings ensures good cooperation and sealing between components, reducing friction and wear. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the transmission structure of a tractor gearbox from the outside;

[0025] Figure 2 is Figure 1 is a sectional view of A-A in the middle;

[0026] Figure 3 is Figure 1 is a sectional view of B-B in the middle;

[0027] Figure 4 is Figure 2 is a sectional view of C-C in the middle;

[0028] In the figure, 1 is the box body, 2 is the speed gear transmission mechanism, 3 is the reverse gear transmission mechanism, 4 is the intermediate transition mechanism, 5 is the output transmission mechanism, 7 is the input shaft, 8 is the output shaft, 9 is the first gear, 10 is the first clutch, 11 is the driving gear, 12 is the second clutch, 13 is the second gear, 14 is the first transmission shaft, 15 is the shock absorber, 16 is the intermediate transition shaft, 17 is the first transition gear, 18 is the second transition gear, 19 is the second transmission shaft, 20 is the third clutch, 21 is the third gear, and 22 is the driven gear. DETAILED DESCRIPTION

[0029] In order to deepen the understanding of the present application, the following will be further described in combination with the embodiments and the drawings. The embodiments are only used to explain the present application and do not constitute a limitation on the protection scope of the present application.

[0030] As Figures 1-4The shown, box 1, speed gear drive mechanism 2, reverse drive mechanism 3, intermediate transition mechanism 4, output drive mechanism 5, input shaft 7, output shaft 8, first gear 9, 9 first clutch 10, driving gear 11, second clutch 12, second gear 13, first transmission shaft 14, shock absorber 15, intermediate transition shaft 16, first transition gear 17, second transition gear 18, second transmission shaft 19, third clutch 20, third gear 21, driven gear 22;

[0031] A tractor gearbox drive structure, comprising a hydraulic oil circuit system, a transmission mechanism, a box 1, the hydraulic oil circuit system comprises a working oil circuit and a lubricating oil circuit, the working oil circuit system is used for controlling the transmission mechanism, the transmission mechanism is installed in the box 1, the transmission mechanism comprises a speed gear drive mechanism 2, a reverse drive mechanism 3, an output drive mechanism 5; wherein the speed gear drive mechanism 2 comprises a high-speed gear drive mechanism, a low-speed gear drive mechanism;

[0032] The high-speed gear drive mechanism comprises a first transmission shaft 14, the first transmission shaft 14 is coaxially provided with a first gear 9, a 9 first clutch 10, the first gear 9 is rotatably connected with the first transmission shaft 14, the 9 first clutch 10 comprises a first part and a second part, the first part is fixedly connected with the first transmission shaft 14, and the second part is fixedly connected with the first gear 9;

[0033] The low-speed gear drive mechanism comprises a second gear 13 and a second clutch 12 coaxially provided on the first transmission shaft 14, the second gear 13 is rotatably connected with the first transmission shaft 14, and the second clutch 12 comprises a first part and a second part, the first part is fixedly connected with the first transmission shaft 14, and the second part is fixedly connected with the second gear 13,

[0034] The second gear 13 and the first gear 9 are driven through an intermediate transition mechanism 4, the intermediate transition mechanism 4 comprises an intermediate transition shaft 16, the intermediate transition shaft 16 is coaxially provided with a first transition gear 17 and a second transition gear 18, the first transition gear 17 is engaged with the second gear 13, and the second transition gear 18 is engaged with the first gear 9;

[0035] The reverse gear comprises a second transmission shaft 19, the second transmission shaft 19 is coaxially provided with a driven gear 22, a third clutch 20 and a third gear 21, the driven gear 22 is engaged with the driving gear 11, the driving gear 11 is fixedly and coaxially installed on the first transmission shaft 14, the third gear 21 is rotatably connected with the second transmission shaft 19, the third gear 21 is engaged with the second transition gear 18, the third clutch 20 comprises a first part and a second part, the first part is fixedly connected with the second transmission shaft 19, and the second part is fixedly connected with the third gear 21;

[0036] The output transmission mechanism 5 comprises an input shaft 7 and an output shaft 8, the input shaft 7 is fixedly connected with the first gear 9, the output shaft 8 is in transmission with the input shaft 7 through a gear mechanism, and the output shaft 8 is used for transmitting power to the wheels.

[0037] In the embodiment, the second transmission shaft 19 is located at the side of the first transmission shaft 14, the output shaft 8 is located below the first transmission shaft 14, and the intermediate transition shaft 16 is located below the first transmission shaft 14 and the second transmission shaft 19.

[0038] In the embodiment, the first transmission shaft 14 is rotatably connected with the first gear 9 and the second gear 13 through a first bearing, and the second transmission shaft 19 is rotatably connected with the third gear 21 through a first bearing.

[0039] In the embodiment, the intermediate transition shaft 16, the first transmission shaft 14 and the second transmission shaft 19 are installed in the box 1 through a second bearing.

[0040] In the embodiment, the first transmission shaft 14 is rotatably connected with the first clutch 10 and the first part of the second clutch 12, and the second transmission shaft 19 is rotatably connected with the first part of the third clutch 20.

[0041] In the embodiment, the front end of the first transmission shaft 14 is sleeved with a shock absorber 15 through a spline structure, and a sealing ring is arranged between the shock absorber 15 and the first transmission shaft 14.

[0042] In the embodiment, the first transmission shaft 14 and the second transmission shaft 19 are both installed in the end cover, the end cover is installed in the pre-set inner hole of the box 1, and a sealing ring is arranged between the end cover and the inner wall of the inner hole, between the end cover and the first transmission shaft 14, and between the end cover and the second transmission shaft 19.

[0043] In the embodiment, the end cover is fixedly connected with the box 1 through bolts.

[0044] Usage: when it is needed to switch gears, the driver presses the corresponding control button on the operation table in the cab, so that the electric control electromagnetic valve provides hydraulic oil with a certain pressure, the hydraulic oil with a certain pressure controls the corresponding clutch to be combined through the working oil path system.

[0045] When switching to the high-speed gear, the first clutch 10 is combined, and the power is transmitted from the engine, the shock absorber 15, the first transmission shaft 9, the first clutch 10, the first gear 9, the input shaft 7 and the output shaft 8 to the wheels in turn.

[0046] When switching to the low speed gear, the second clutch 12 is engaged, and the power is transmitted from the engine, the damper 15, the first transmission shaft 14, the second clutch 12, the second gear 13, the first transition gear 17, the intermediate transition shaft 16, the second transition gear 18, the first gear 9, the input shaft 7, the output shaft 8 to the wheels in turn; it should be noted that at this time, the first gear 9 is connected with the second part of the first clutch 10, but it is separated from the first part of the first clutch 10, so the first gear 9 is in a rotatable state independently relative to the first transmission shaft 14;

[0047] When switching to the reverse gear, the third clutch 20 is engaged, and the power is transmitted from the engine, the damper 15, the first transmission shaft 14, the driving gear 11, the driven gear 22, the second transmission shaft 19, the third clutch 20, the third gear 21, the second transition gear 18, the first gear 9, the input shaft 7, the output shaft 8 to the wheels in turn;

[0048] It should be noted that when in the low speed gear and the reverse gear, the first gear 9 is connected with the second part of the first clutch 10, but it is separated from the first part of the first clutch 10, so the first gear 9 is in a rotatable state independently relative to the first transmission shaft 14.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transmission structure for a tractor gearbox, characterized in that, It includes a hydraulic circuit system, a transmission mechanism, and a housing. The hydraulic circuit system includes a working oil circuit and a lubrication oil circuit. The working oil circuit system is used to control the operation of the transmission mechanism. The transmission mechanism is installed in the housing and includes a high-speed transmission mechanism, a low-speed transmission mechanism, a reverse transmission mechanism, and an output transmission mechanism. The high-speed transmission mechanism includes a first transmission shaft, on which a first gear and a first clutch are coaxially mounted. The first gear is rotatably connected to the first transmission shaft. The first clutch includes a first part and a second part, the first part of which is fixedly connected to the first transmission shaft and the second part of which is fixedly connected to the first gear. The low-speed transmission mechanism includes a second gear and a second clutch coaxially mounted on a first transmission shaft. The second gear is rotatably connected to the first transmission shaft. The second clutch includes a first part and a second part, with the first part fixedly connected to the first transmission shaft and the second part fixedly connected to the second gear. The second gear and the first gear are connected by an intermediate transition mechanism. The intermediate transition mechanism includes an intermediate transition shaft, on which the first transition gear and the second transition gear are coaxially mounted. The first transition gear meshes with the second gear, and the second transition gear meshes with the first gear. The reverse gear includes a second drive shaft, through which a driven gear, a third clutch, and a third gear are coaxially mounted. The driven gear meshes with the driving gear, the driving gear is fixedly coaxially mounted on the first drive shaft, the third gear is rotatably connected to the second drive shaft, and the third gear meshes with a second transition gear. The third clutch includes a first part and a second part, the first part is fixedly connected to the second drive shaft, and the second part is fixedly connected to the third gear. The output transmission mechanism includes an input shaft and an output shaft. The input shaft is fixedly connected to the first gear, and the output shaft and the input shaft are driven by a gear mechanism. The output shaft is used to transmit power to the wheels.

2. The transmission structure of a tractor gearbox according to claim 1, characterized in that, The second drive shaft is located to the side of the first drive shaft, the output shaft is located below the first drive shaft, and the intermediate transition shaft is located below the area between the first and second drive shafts.

3. The transmission structure of a tractor gearbox according to claim 1, characterized in that, The first drive shaft is rotatably connected to the first gear and the second gear, and the second drive shaft is rotatably connected to the third gear through the first bearing.

4. The transmission structure of a tractor gearbox according to claim 1, characterized in that, The intermediate transition shaft, the first drive shaft, and the second drive shaft are mounted in the housing via the second bearing.

5. The transmission structure of a tractor gearbox according to claim 1, characterized in that, A sealing ring is provided between the first drive shaft and the first clutch, the first part of the second clutch, and between the second drive shaft and the first part of the third clutch.

6. The transmission structure of a tractor gearbox according to claim 1, characterized in that, A vibration damper is sleeved at the front end of the first drive shaft via a spline structure, and a sealing ring is provided between the vibration damper and the first drive shaft.

7. The transmission structure of a tractor gearbox according to claim 1, characterized in that, Both ends of the first and second drive shafts are installed in end covers. The end covers are installed in the pre-set inner holes in the housing. Sealing rings are provided between the end covers and the inner wall of the inner hole, between the end covers and the first drive shaft, and between the end covers and the second drive shaft.

8. The transmission structure of a tractor gearbox according to claim 1, characterized in that, The end caps are fixedly connected to the housing with bolts.

Images