Gearbox for large agricultural machine

Abstract

The utility model belongs to the technical field of agricultural machines, and relates to a gearbox for a large agricultural machine, which comprises a gearbox body, an input shaft and a drive half shaft, the gearbox body comprises an inner shell and an outer shell, the input shaft extends into the gearbox body from the inner shell and is sleeved with an input gear, and the drive half shaft is sleeved with an output shaft. The driving half shaft is sleeved with a driving gear and extends out of the gearbox body from the shell, a first gear shaft and a second gear shaft are rotationally arranged in the gearbox body, the first gear shaft is sleeved with a first intermediate pinion and a first intermediate bull gear, the second gear shaft is sleeved with a second intermediate pinion and a second intermediate bull gear, and the first intermediate pinion and the second intermediate bull gear are meshed with the second intermediate pinion and the second intermediate bull gear. The input gear is in meshed transmission with the first middle large gear, the first middle small gear is in meshed transmission with the second middle large gear, and the second middle small gear is in meshed transmission with the driving gear. The gearbox for the large agricultural machine can provide larger torsion and has the advantage of being simple and compact in structure.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of agricultural machine, and relates to a gearbox for large agricultural machine. BACKGROUND

[0002] The agricultural machine transmits power through a dedicated gearbox, and the gearbox for agricultural machine has significant differences in design ideas, structural features and use occasions from the gearbox for other vehicles. The gearbox for agricultural machine does not have high speed requirement, and pays more attention to large torque and heavy load to adapt to the harsh requirements of agricultural operation.

[0003] A typical gearbox for agricultural machine is disclosed in Chinese utility model CN218564313U (publication date: March 3, 2023), which is an agricultural variable speed driving device, comprising two gearboxes which are identical in structure and oppositely arranged, the gearboxes comprise an inner shell and an outer shell forming a gear cavity, a gear set is arranged in the gear cavity, the gear set comprises an input gear, a first intermediate gear meshing with the input gear, a second intermediate gear coaxial with the intermediate gear and a driving gear meshing with the second intermediate gear, a driving half shaft extending out of the outer shell is fixed axially in the driving gear, the driving half shaft axes of the two gearboxes are on the same straight line, and a plurality of connecting rods are fixedly connected between the gearboxes.

[0004] The transmission ratio of the existing gearbox for agricultural machine is generally about 15:1, which cannot meet the requirement of large torque for large agricultural machine. UTILITY MODEL CONTENTS

[0005] The utility model provides a gearbox for large agricultural machine in view of the shortage of prior art, can provide greater torque, still has the advantages such as simple and compact structure.

[0006] To solve the above technical problem, the purpose of the utility model is realized by the following technical scheme:

[0007] A gearbox for large agricultural machine, comprising a gearbox body, an input shaft and a driving half shaft, the gearbox body comprises an inner shell and an outer shell, the input shaft extends into the gearbox body from the inner shell and is sleeved with an input gear, the driving half shaft is sleeved with a driving gear and extends out of the gearbox body from the outer shell, a first gear shaft and a second gear shaft are rotationally arranged in the gearbox body, a first intermediate small gear and a first intermediate large gear are sleeved on the first gear shaft, a second intermediate small gear and a second intermediate large gear are sleeved on the second gear shaft, the input gear, the first intermediate large gear, the first intermediate small gear, the second intermediate large gear and the second intermediate small gear are respectively meshed and driven, and the second gear shaft extends out of the gearbox body from the inner shell and is sleeved with a hydraulic brake.

[0008] In the above-mentioned gearbox for large agricultural machines, the first intermediate small gear is integrally formed with the first gear shaft, and the first intermediate large gear is connected with the first gear shaft through a spline; the second intermediate small gear is integrally formed with the second gear shaft, and the second intermediate large gear is connected with the second gear shaft through a spline.

[0009] In the above-mentioned gearbox for large agricultural machines, the inner shell and the outer shell of the gearbox body are respectively provided with bearing mounting cavities, bearings are arranged in the bearing mounting cavities, and the first gear shaft and the second gear shaft are rotatably supported by the bearings.

[0010] In the above-mentioned gearbox for large agricultural machines, the outer side of the outer shell is connected with a half shaft shell seat and a bearing seat, the driving half shaft is arranged in the half shaft shell seat and rotatably supported by the bearing in the bearing seat.

[0011] In the above-mentioned gearbox for large agricultural machines, the outer side of the inner shell is provided with a flange seat, the cylinder body of the hydraulic brake is mounted on the flange seat through fasteners, and the end of the second gear shaft is connected with the connecting sleeve of the hydraulic brake through a spline; the hydraulic brake adopts a general type in the art.

[0012] In the above-mentioned gearbox for large agricultural machines, the input shaft and the driving half shaft are distributed on the same side, and the first gear shaft and the second gear shaft are distributed on the same side; the same side distribution means that the connecting line formed by the input shaft and the driving half shaft does not intersect with the connecting line formed by the first gear shaft and the second gear shaft; the input gear, the first intermediate large gear, the second intermediate small gear and the driving gear are located on the side close to the outer shell in the gearbox body, and the first intermediate small gear and the second intermediate large gear are located on the side close to the inner shell in the gearbox body.

[0013] In the above-mentioned gearbox for large agricultural machines, the number of teeth of the input gear, the first intermediate small gear and the second intermediate small gear is 15-20, the number of teeth of the driving gear, the first intermediate large gear and the second intermediate large gear is 40-60, and the transmission ratio of the gearbox is 20-40:1.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model provides a kind of gearbox for large agricultural machine, first-level speed change structure is formed by input gear and first intermediate large gear, second-level speed change structure is formed by first intermediate small gear and second intermediate large gear, third-level speed change structure is formed by second intermediate small gear and driving gear, transmission ratio is improved by above three-level speed change structure, and torsion is increased.Compared with traditional gearbox, the gearbox of the utility model can increase torsion by more than 1.5 times, to meet the large torsion demand of large agricultural machine.Meanwhile, the utility model further optimizes the layout of transmission structure and brake structure, so that the structure of gearbox is more compact, and transmission is more smooth. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the perspective drawing of the utility model;

[0017] Figure 2 It is the internal perspective drawing of the utility model;

[0018] Figure 3 It is the explosion drawing of the utility model;

[0019] Figure 4 It is the explosion drawing of the gearbox body of the utility model;

[0020] Reference signs: 1, gearbox body;2, drive half shaft;3, inner shell;4, outer shell;5, input gear;6, driving gear;7, first gear shaft;8, second gear shaft;9, first intermediate small gear;10, first intermediate large gear;11, second intermediate small gear;12, second intermediate large gear;13, hydraulic brake;14, bearing mounting cavity;15, bearing;16, flange seat. DETAILED DESCRIPTION

[0021] The utility model is further described in conjunction with the drawings with specific embodiment, referring to Figures 1-4 :

[0022] A kind of gearbox for large agricultural machine, including gearbox body 1, input shaft and drive half shaft 2, the gearbox body 1 includes inner shell 3 and outer shell 4, the input shaft is extended into gearbox body 1 by inner shell 3 and is sleeved input gear 5, the drive half shaft 2 is sleeved driving gear 6 and is extended out of gearbox body 1 by outer shell 4, first gear shaft 7 and second gear shaft 8 are rotationally arranged in the gearbox body 1, the first gear shaft 7 is sleeved with first intermediate small gear 9 and first intermediate large gear 10, the second gear shaft 8 is sleeved with second intermediate small gear 11 and second intermediate large gear 12, the input gear 5 is engaged transmission with first intermediate large gear 10, first intermediate small gear 9 and second intermediate large gear 12, second intermediate small gear 11 and driving gear 6 respectively, the second gear shaft 8 is extended out of gearbox body 1 by inner shell 3 and is sleeved with hydraulic brake 13.

[0023] The variable speed principle of the embodiment is: the power device drives the input shaft to rotate, the input gear 5 rotates with the input shaft, the input gear 5 drives the first intermediate large gear 10 engaged therewith to rotate, the first gear shaft 7 and the first intermediate small gear 9 rotate with it, the first intermediate small gear 9 drives the second intermediate large gear 12 engaged therewith to rotate, the second intermediate small gear 11 and the second gear shaft 8 rotate with it, the second intermediate small gear 11 drives the drive gear 6 engaged therewith to rotate, and finally drives the drive half shaft 2 to rotate to output power. Through the above three-stage transmission structure, a larger transmission ratio and torque can be formed. In the embodiment, the tooth numbers of the input gear 5, the first intermediate large gear 10, the first intermediate small gear 9, the second intermediate large gear 12, the second intermediate small gear 11 and the drive gear 6 are 16, 53, 20, 56, 17 and 45 respectively, and a transmission ratio of about 24:1 can be formed.

[0024] In the embodiment, the traditional drum brake is replaced by a hydraulic brake 13, and the second gear shaft 8 is extended out of the transmission case to install the hydraulic brake 13. When braking, the hydraulic brake 13 brakes the second gear shaft 8, thereby braking the entire transmission system. Through the external hydraulic brake 13, the embodiment reduces the space occupation of the transmission case cavity, so that there is enough space to install the three-stage transmission system, and makes the structure of the transmission case more compact.

[0025] The specific structure of each gear in the embodiment is: the first intermediate small gear 9 is integrally formed with the first gear shaft 7, and the first intermediate large gear 10 is connected with the first gear shaft 7 through a spline; the second intermediate small gear 11 is integrally formed with the second gear shaft 8, and the second intermediate large gear 12 is connected with the second gear shaft 8 through a spline.

[0026] In the embodiment, each shaft is supported to rotate by a bearing 15, and the specific structure is:

[0027] The inner side of the inner shell 3 and the outer shell 4 of the above transmission case body 1 is respectively provided with a bearing mounting cavity 14, the bearing mounting cavity 14 is internally assembled with a bearing 15, and the first gear shaft 7 and the second gear shaft 8 are supported to rotate by the bearing 15. In the embodiment, the bearing mounting cavity 14 is formed by stamping the cavity outward of the inner shell 3 and the outer shell 4.

[0028] The outer side of the above outer shell 4 is connected with a half shaft shell seat and a bearing seat, the drive half shaft 2 is arranged in the half shaft shell seat and supported to rotate by the bearing 15 in the bearing seat.

[0029] In the embodiment, the specific mounting structure of the hydraulic brake 13 is that a flange seat 16 is arranged on the outer side of the inner shell 3, the cylinder body of the hydraulic brake 13 is mounted on the flange seat 16 through fasteners, and the end of the second gear shaft 8 is connected with the connecting sleeve of the hydraulic brake 13 through a spline; the hydraulic brake 13 adopts a general type in the art.

[0030] The embodiment further optimizes the layout of the transmission system: the input shaft and the drive half shaft 2 are distributed on the same side, and the first gear shaft 7 and the second gear shaft 8 are distributed on the same side; the same side distribution means that the line formed by the input shaft and the drive half shaft 2 does not intersect with the line formed by the first gear shaft 7 and the second gear shaft 8; the input gear 5, the first intermediate large gear 10, the second intermediate small gear 11 and the drive gear 6 are located on one side of the transmission case 1 close to the outer shell 4, and the first intermediate small gear 9 and the second intermediate large gear 12 are located on the other side of the transmission case 1 close to the inner shell 3.

[0031] The above embodiment is only a preferred embodiment of the present application, and does not limit the protection scope of the present application, so that: equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A gearbox for large agricultural machines, comprising a gearbox housing (1), an input shaft and a drive half shaft (2), the gearbox housing (1) comprising an inner housing (3) and an outer housing (4), the input shaft extending into the gearbox housing (1) from the inner housing (3) and housing an input gearwheel (5), the drive half shaft (2) housing a drive gearwheel (6) and extending out of the gearbox housing (1) from the outer housing (4), characterized in that, The first gear shaft (7) and the second gear shaft (8) are arranged in rotation in the gearbox body (1), the first intermediate small gear (9) and the first intermediate large gear (10) are sleeved on the first gear shaft (7), the second intermediate small gear (11) and the second intermediate large gear (12) are sleeved on the second gear shaft (8), the input gear (5), the first intermediate large gear (10), the first intermediate small gear (9) and the second intermediate large gear (12), the second intermediate small gear (11) and the drive gear (6) are respectively engaged in transmission, and the second gear shaft (8) extends out of the gearbox body (1) by the inner shell (3) and is sleeved with the hydraulic brake (13). ​ 2. The gearbox according to claim 1, characterized in that The first intermediate small gear (9) is integrally formed with the first gear shaft (7), and the first intermediate large gear (10) is connected with the first gear shaft (7) through the spline; the second intermediate small gear (11) is integrally formed with the second gear shaft (8), and the second intermediate large gear (12) is connected with the second gear shaft (8) through the spline.

3. The gearbox according to claim 1, characterized in that, The inner shell (3) and the outer shell (4) of the gearbox body (1) are respectively provided with bearing mounting cavities (14) on the inner sides, the bearing mounting cavities (14) are assembled with bearings (15), and the first gear shaft (7) and the second gear shaft (8) are supported in rotation by the bearings (15).

4. The gearbox according to claim 1, wherein The outer side of the inner shell (3) is provided with a flange seat (16), the cylinder body of the hydraulic brake (13) is mounted on the flange seat (16) through fasteners, and the end of the second gear shaft (8) is connected with the connecting sleeve of the hydraulic brake (13) through the spline.

5. The gearbox according to claim 1, wherein The input shaft and the drive half shaft (2) are distributed on the same side, the first gear shaft (7) and the second gear shaft (8) are distributed on the same side; the input gear (5), the first intermediate large gear (10), the second intermediate small gear (11) and the drive gear (6) are located on one side of the gearbox body (1) close to the outer shell (4), and the first intermediate small gear (9) and the second intermediate large gear (12) are located on one side of the gearbox body (1) close to the inner shell (3).

6. The gearbox according to claim 1, wherein The number of teeth of the input gear (5), the first intermediate small gear (9) and the second intermediate small gear (11) is 15-20, the number of teeth of the drive gear (6), the first intermediate large gear (10) and the second intermediate large gear (12) is 40-60, and the transmission ratio of the gearbox is 20-40:1.

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