Tractor power output device

Abstract

The invention discloses a tractor power output device, and belongs to the technical field of tractor manufacturing. A power output device of a tractor comprises a box body, a first driving shaft and a second driving shaft, the first driving shaft and the second driving shaft are rotationally connected into the box body, four sets of driving gears are sequentially arranged in the axis direction of the first driving shaft, four sets of driven gears are sequentially arranged in the axis direction of the second driving shaft, and a gear shifting meshing sleeve is arranged between every two sets of driven gears. The gear shifting meshing sleeve is meshed with the second driving shaft; the meshing positions between the four sets of driving gears and the four sets of driven gears can be changed through operation of the gear shifting meshing sleeve, so that the rotating speed difference between the first driving shaft and the second driving shaft is changed, the purpose of four different transmission ratios is achieved, and the operation requirements of users are met.

Description

Technical Field

[0001] The present invention relates to the technical field of tractor manufacturing, and in particular to a power output device for a tractor. Background Art

[0002] Tractors are important power machinery in agricultural production. They can form tractor operating units with agricultural machinery to complete field operations, and can also tow trailers to complete transportation operations. Therefore, tractors are an indispensable carrier for implementing precision agriculture. With the continuous development of my country's agricultural modernization, farmers' requirements for the functionality of machinery are constantly increasing.

[0003] In the prior art, most of the power output devices used in tractors are of two-speed structure, but the two-speed structure cannot meet the user's operating requirements under different working conditions. Therefore, we propose a power output device for a tractor. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the two-speed structure in the prior art cannot meet the user's operating requirements under different working conditions, and to propose a tractor power output device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A tractor power output device comprises a housing and a first driving shaft and a second driving shaft rotatably connected in the housing, four groups of driving gears are sequentially arranged along the axis direction of the first driving shaft, four groups of passive gears are sequentially arranged along the axis direction of the second driving shaft, and a shifting meshing sleeve is arranged between every two groups of passive gears, and the shifting meshing sleeve is meshed with the second driving shaft.

[0007] Preferably, the driving gear includes a first gear driving gear, a second gear driving gear, a third gear driving gear and a fourth gear driving gear; the passive gear includes a first gear passive gear, a second gear passive gear, a third gear passive gear and a fourth gear passive gear, and the two groups of shift engagement sleeves are respectively arranged between the first gear passive gear and the second gear passive gear, and between the third gear passive gear and the fourth gear passive gear.

[0008] In order to make the output more stable, further, the second driving shaft includes an output driven shaft rotatably connected in the housing, one end of the output driven shaft extends to the outside of the housing and is connected to a power output shaft through a coupling, and the driven gear is arranged on the output driven shaft.

[0009] In order to facilitate maintenance, further, the first driving shaft and the output driven shaft are both provided with splines, and the I-speed driving gear, the II-speed driving gear and the shift engagement sleeve are all meshed with the splines.

[0010] In order to improve the smoothness of gear shifting, preferably, the gear shift engagement sleeve includes: a shift fork, a switching ring and an engaging gear, wherein the shift fork is rotatably connected to the switching ring, a power conversion tooth is provided on the passive gear, and the switching ring is meshed with the engaging gear and the power conversion tooth; a shift member arranged on the housing is used to drive the shift fork.

[0011] In order to improve the accuracy of gear shifting, the gear shifting member further includes a driving rod, which is fixedly connected to the gear shift fork, wherein a plurality of ball grooves are provided on the driving rod, a spring is provided on the box body, a ball is provided at one end of the spring, and the ball cooperates with the ball groove.

[0012] In order to improve the gear shifting accuracy, further, shaft sleeves are arranged between the first gear driving gear, the second gear driving gear and the third gear driving gear.

[0013] Furthermore, the passive gear and the output passive shaft are rotationally matched via a bearing.

[0014] Furthermore, the box body includes a base shell and a protective shell covering the base shell, and the first driving shaft and the output driven shaft are both rotatably connected in the protective shell.

[0015] Compared with the prior art, the present invention provides a tractor power output device having the following beneficial effects:

[0016] 1. The tractor power output device changes the engagement and separation of different passive gears with the second driving shaft through the shifting engagement sleeve, thereby realizing the switching of four-speed transmission ratios, effectively meeting the user's operating needs;

[0017] 2. The tractor power output device is connected to the power output shaft through the elastic connection of the coupling, thereby reducing the rigid impact of the meshing between the driving gear and the passive gear, effectively protecting the meshing between the two driving shafts and the gears, and prolonging their service life;

[0018] 3. The tractor power output device is easy to replace and maintain through a spline connection. The first driving shaft and the output driven shaft are both rotatably connected in a sealed cavity, which, on the one hand, prevents external dust pollution and, on the other hand, ensures lubrication efficiency and component service life.

[0019] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The present invention can change the meshing position between the four groups of driving gears and the four groups of driven gears through the operation of the shift engagement sleeve, thereby changing the speed difference between the first driving shaft and the second driving shaft, achieving the purpose of four different transmission ratios and meeting the user's operating requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A three-dimensional schematic diagram of a tractor power output device proposed by the present invention;

[0021] Figure 2 A schematic plan cross-sectional view of a tractor power output device proposed by the present invention;

[0022] Figure 3 A schematic diagram of the partial structure of a tractor power output device proposed by the present invention Figure 1 ;

[0023] Figure 4 A schematic diagram of the partial structure of a tractor power output device proposed by the present invention Figure 2 ;

[0024] Figure 5 A schematic diagram of the partial structure of a tractor power output device proposed by the present invention Figure 3 ;

[0025] Figure 6 A schematic diagram of the partial structure of a tractor power output device proposed by the present invention Figure 4 .

[0026] In the figure: 1, first driving shaft; 101, spline; 102, bushing; 2, I gear driving gear; 3, II gear driving gear; 4, III gear driving gear; 5, IV gear driving gear; 6, output passive shaft; 7, I gear passive gear; 8, II gear passive gear; 9, III gear passive gear; 10, IV gear passive gear; 11, output shaft; 12, base shell; 13, shift engagement sleeve; 1301, shift fork; 1302, switching ring; 1303, engagement gear; 1304, conversion tooth; 14, driving rod; 1401, ball groove; 1402, ball; 1403, spring; 15, protective shell. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Embodiment 1:

[0030] Reference Figure 1-Figure 6A tractor power output device comprises a housing and a first driving shaft 1 and a second driving shaft rotatably connected in the housing. Here, the first driving shaft 1 is preferably used as a power shaft connected to an engine, i.e., an input part, and the second driving shaft is used as a power shaft connected to a traveling part of the tractor, i.e., an output part. Four groups of driving gears are sequentially arranged along the axial direction of the first driving shaft 1, and four groups of passive gears are sequentially arranged along the axial direction of the second driving shaft, and a shifting meshing sleeve 13 is arranged between every two groups of passive gears. The shifting meshing sleeve 13 meshes with the second driving shaft. The meshing positions between the four groups of driving gears and the four groups of driven gears can be changed by operating the shifting meshing sleeve 13, thereby changing the speed difference between the first driving shaft 1 and the second driving shaft, so as to achieve the purpose of four different transmission ratios and meet the operation requirements of users.

[0031] Specifically, the driving gears include a first gear driving gear 2, a second gear driving gear 3, a third gear driving gear 4 and a fourth gear driving gear 5; the passive gears include a first gear passive gear 7, a second gear passive gear 8, a third gear passive gear 9 and a fourth gear passive gear 10, and two sets of shift engagement sleeves 13 are respectively arranged between the first gear passive gear 7 and the second gear passive gear 8, the third gear passive gear 9 and the fourth gear passive gear 10, and the same numbered ones are in a meshing state. The shift engagement sleeves 13 are used to change the meshing and separation of different passive gears with the second driving shaft, thereby realizing the switching of four gear ratios, effectively meeting the user's operating needs.

[0032] In addition, the second driving shaft includes an output passive shaft 6 rotatably connected in the housing, one end of the output passive shaft 6 extends to the outside of the housing and is connected to a power output shaft 11 through a coupling, and the passive gear is arranged on the output passive shaft 6. The power output shaft 11 is externally connected through an elastic connection method of the coupling, thereby reducing the rigid impact of the meshing between the driving gear and the passive gear, effectively protecting the meshing between the two driving shafts and the gears, and improving their service life.

[0033] Splines 101 are provided on the first driving shaft 1 and the output driven shaft 6. The I-speed driving gear 2 and the II-speed driving gear 3 are detachably connected to the first driving shaft 1 through the splines 101, which is convenient for replacement and maintenance. Bushings 102 are provided between the I-speed driving gear 2, the II-speed driving gear 3 and the III-speed driving gear 4 to maintain the distance between the driving gears and ensure the meshing accuracy between the driving gears and the driven gears. The III-speed driving gear 4 and the IV-speed driving gear 5 are directly fixedly connected to the first driving shaft 1. The shift engagement sleeve 13 is meshed with the output driven shaft 6 through the splines 101. The driven gear is rotatably connected to the output driven shaft 6 through a needle bearing, and the inner ring of the needle bearing is a structure with meshing splines 101.

[0034] Embodiment 2:

[0035] A tractor power output device comprises a housing and a first driving shaft 1 and a second driving shaft rotatably connected in the housing, wherein the first driving shaft 1 is preferably used as a power shaft connected to an engine, i.e., an input part, and the second driving shaft is used as a power shaft connected to a tractor travel part, i.e., an output part. Four groups of driving gears are sequentially arranged along the axis direction of the first driving shaft 1, and four groups of passive gears are sequentially arranged along the axis direction of the second driving shaft, and a shifting meshing sleeve 13 is arranged between every two groups of passive gears, and the shifting meshing sleeve 13 is meshed with the second driving shaft. The meshing positions between the four groups of driving gears and the four groups of driven gears can be changed by operating the shifting meshing sleeve 13, thereby changing the speed difference between the first driving shaft 1 and the second driving shaft, and the shifting meshing sleeve 13 is used to mesh with the second driving shaft. The sleeve 13 includes: a shift fork 1301, a switching ring 1302 and a meshing gear 1303, wherein the shift fork 1301 is rotatably connected to the switching ring 1302, the end faces of the four groups of passive gears are fixedly connected with power conversion teeth 1304, and the inner ring of the switching ring 1302 is provided with two rows of tooth structures, which can mesh with the meshing gear 1303 and the power conversion teeth 1304. Here, when the switching ring 1302 is only meshed with the meshing gear 1303, there is no power transmission between the two driving shafts, and when the two rows of tooth structures of the switching ring 1302 are respectively meshed with the meshing gear 1303 and the power conversion teeth 1304, power transmission is formed between the two driving shafts; there is also a shift member arranged on the housing, which is used to drive the shift fork 1301.

[0036] Specifically, the shifting member includes a driving rod 14, which is fixedly connected to the shift fork 1301, wherein a plurality of ball grooves 1401 are provided on the driving rod 14, a spring 1403 is provided on the box body, a ball 1402 is provided at one end of the spring 1403, and the ball 1402 cooperates with the ball groove 1401. When the driving rod 14 is pushed, the engagement position between the ball 1402 and the plurality of ball grooves 1401 can be changed, which is the shifting position.

[0037] Specifically, the housing includes a base shell 12 and a protective shell 15 covering the base shell 12, which forms a cavity. The first driving shaft 1 and the output driven shaft 6 are both rotatably connected in the sealed cavity, which prevents external dust pollution on the one hand and ensures lubrication efficiency and component service life on the other hand.

[0038] In the present invention, power is input into the device from the first driving shaft 1, driving the first gear driving gear 2, the second gear driving gear 3, the third gear driving gear 4 and the fourth gear driving gear 5 to rotate, and the first gear driving gear 2, the second gear driving gear 3, the third gear driving gear 4 and the fourth gear driving gear 5 are respectively always meshed with the first gear passive gear 7, the second gear passive gear 8, the third gear passive gear 9 and the fourth gear passive gear 10. When the first group of the shifting meshing sleeve 13 controls the first gear driving gear 2 and the second gear driving gear 3 to mesh with the first gear passive gear 7 and the second gear passive gear 8 respectively, the power is output to the first and second gears; when the second group of the shifting meshing sleeve 13 controls the third gear driving gear 4 and the fourth gear driving gear 5 to mesh with the third gear passive gear 9 and the fourth gear passive gear 10 respectively, the power is output to the third and fourth gears, thereby realizing the output operation of the four-speed transmission ratio, effectively meeting the user's operation requirements for different working conditions.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tractor power output device, comprising a housing and a first driving shaft (1) and a second driving shaft rotatably connected in the housing, characterized in that: Four groups of driving gears are arranged in sequence along the axis direction of the first driving shaft (1), and four groups of passive gears are arranged in sequence along the axis direction of the second driving shaft, and a shifting engagement sleeve (13) is arranged between every two groups of passive gears, and the shifting engagement sleeve (13) is meshed with the second driving shaft.

2. A tractor power output device according to claim 1, characterized in that: The driving gears include a first gear driving gear (2), a second gear driving gear (3), a third gear driving gear (4) and a fourth gear driving gear (5); The passive gears include a first gear passive gear (7), a second gear passive gear (8), a third gear passive gear (9) and a fourth gear passive gear (10), and two groups of shift engagement sleeves (13) are respectively arranged between the first gear passive gear (7) and the second gear passive gear (8), and between the third gear passive gear (9) and the fourth gear passive gear (10).

3. A tractor power output device according to claim 2, characterized in that: The second driving shaft comprises an output driven shaft (6) rotatably connected in the housing, one end of the output driven shaft (6) extends to the outside of the housing and is connected to a power output shaft (11) via a coupling, and the driven gear is arranged on the output driven shaft (6).

4. A tractor power output device according to claim 3, characterized in that: The first driving shaft (1) and the output driven shaft (6) are both provided with splines (101), and the first gear driving gear (2), the second gear driving gear (3) and the shift engagement sleeve (13) are all meshed with the splines (101).

5. A tractor power output device according to claim 4, characterized in that: The gear shifting engagement sleeve (13) comprises: A shift fork (1301), a switching ring (1302) and a meshing gear (1303), The shift fork (1301) is rotatably connected to the switching ring (1302), a power conversion tooth (1304) is provided on the passive gear, and the switching ring (1302) is meshed with the meshing gear (1303) and the power conversion tooth (1304); The shifting member arranged on the housing is used to drive the shifting fork (1301).

6. A tractor power output device according to claim 5, characterized in that: The shift member comprises a driving rod (14), wherein the driving rod (14) is fixedly connected to a shift fork (1301). The driving rod (14) is provided with a plurality of ball grooves (1401), the box body is provided with a spring (1403), one end of the spring (1403) is provided with a ball (1402), and the ball (1402) matches with the ball groove (1401).

7. A tractor power output device according to claim 3, characterized in that: Axle sleeves (102) are arranged between the first gear driving gear (2), the second gear driving gear (3), and the third gear driving gear (4).

8. A tractor power output device according to claim 2, characterized in that: The driven gear and the output driven shaft (6) are rotationally matched via a bearing.

9. A tractor power output device according to claim 3, characterized in that: The box body comprises a base shell (12) and a protective shell (15) covered on the base shell (12); the first driving shaft (1) and the output driven shaft (6) are both rotatably connected in the protective shell (15).

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