12+12 gear tractor transmission system

Abstract

12+12 gear position tractor transmission system relates to transmission system technical field, including input shaft, intermediate shaft and output shaft, the output end of output shaft is connected with planetary gear set, and the planetary gear set is connected with the shuttle sliding sleeve, and the input shaft, the intermediate shaft and the output shaft are connected through gear set. The utility model solves the technical scheme of 12+12 gear position in traditional technology also has the obvious defect, although the gear number target is achieved, but the reverse gear path needs the additional meshing gear pair, causes the gearbox axial size to be too long and be difficult to match the compact cab, increases the manufacturing cost, and the production assembly complex increases the labor problem.

Description

Technical Field

[0001] This utility model relates to the field of transmission system technology, specifically to a 12+12 gear tractor transmission system. Background Technology

[0002] The gearbox transmission system is a crucial component in various mechanical industries. It transmits the engine's output power according to a predetermined path and magnitude, thereby enabling the movement of the working parts. The transmission system primarily functions to change the gear ratio, achieve reverse driving while maintaining the engine's rotation direction, and interrupt power transmission using neutral gear. Depending on the working environment, the driver can operate it accordingly based on actual needs.

[0003] In modern agriculture, the number of gears in the tractor transmission system directly affects the efficiency and economy of farmland operations. Currently, most mainstream models are equipped with 8+8 or 16+16 gears: the former causes the engine to deviate from its efficient operating condition due to the large speed difference, resulting in increased fuel consumption; the latter, although it has a dense gear ratio, adopts a multi-stage gear shaft system layout, which has the problems of bulky structure and high manufacturing cost.

[0004] A prior art patent with publication number CN207569153U discloses a solution comprising a housing containing a clutch unit, a power shuttle shift unit, a main transmission unit, and a secondary transmission unit. These units are sequentially connected in a transmission configuration. The clutch unit includes a torsional damper for connection to the engine. The power shuttle shift unit includes a wet clutch for rapid switching between forward and reverse gears via hydraulic control. The main transmission unit includes a synchronizer for shifting between four gears. This design effectively buffers the impact of engine startup on the subsequent transmission, reduces noise during engine startup, and minimizes wear between gears. It allows for reversing without interrupting power, improving tractor operating efficiency and reducing driver fatigue.

[0005] As existing devices are used, the shortcomings of this technology have gradually become apparent, mainly in the following aspects:

[0006] The existing 12+12 gear technical solution also has significant drawbacks. Although it achieves the target number of gears, the reverse gear path requires an additional meshing gear pair, resulting in an excessively long axial dimension of the gearbox that is difficult to match a compact cab, increasing manufacturing costs and making production and assembly more complex and labor-intensive.

[0007] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] In view of the defects in the existing technology, this utility model provides a 12+12 gear tractor transmission system to solve the problem that the traditional 12+12 gear technical solution also has significant defects. Although the number of gears is achieved, the reverse gear path requires an additional meshing gear pair, which makes the axial dimension of the gearbox too long and difficult to match the compact cab, increasing manufacturing costs and making production and assembly more complicated and labor-intensive.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A 12+12 gear tractor transmission system includes an input shaft, an intermediate shaft, and an output shaft. The output end of the output shaft is connected to a planetary gear set, and a shuttle-type sliding sleeve is connected to the planetary gear set. The input shaft, intermediate shaft, and output shaft are connected by the gear set.

[0011] As an optimized solution, the gear set includes a second-speed drive gear and a third-speed drive gear connected to the input shaft, and a fourth-speed drive gear shaft is coaxially rotatably provided at the end of the input shaft. A third- and fourth-speed meshing sleeve is slidably provided between the third-speed drive gear and the fourth-speed drive gear shaft.

[0012] As an optimized solution, a middle gear drive gear is rotatably mounted on the fourth gear drive shaft, and a middle gear engagement sleeve is slidably mounted on the fourth gear drive shaft.

[0013] As an optimized solution, the gear set includes a third-speed driven gear and a fourth-speed driven gear fixedly connected to the intermediate shaft, and also includes a first-speed driven gear and a second-speed driven gear rotatably connected to the intermediate shaft, with a second-speed meshing sleeve slidably provided between the first-speed driven gear and the second-speed driven gear.

[0014] As an optimized solution, the gear set includes a high-low gear meshing seat connected to the output shaft, a slidingly mounted intermediate gear driven gear meshing sleeve on the high-low gear meshing seat, and a low gear driven gear rotatably mounted on the output shaft.

[0015] As an optimized solution, the second-gear drive gear meshes with the second-gear driven gear.

[0016] As an optimized solution, the third-speed driving gear meshes with the third-speed driven gear.

[0017] As an optimized solution, the fourth-speed drive gear shaft meshes with the fourth-speed driven gear.

[0018] As an optimized solution, the intermediate gear drive gear meshes with the intermediate gear driven gear meshing sleeve.

[0019] As an optimized solution, a first-gear drive gear that meshes with the first-gear driven gear is fixedly connected to the input shaft.

[0020] As an optimized solution, a low-gear drive gear that meshes with the low-gear driven gear is fixedly connected to the fourth-gear drive gear shaft.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This utility model integrates a shuttle mechanism at the rear end of the main and auxiliary transmissions, and achieves forward and reverse movement through a planetary gear mechanism and a sliding sleeve. It eliminates the idler wheel and idler wheel shaft, optimizes the gear system structure, and integrates the low-gear drive gear with the fourth-gear drive gear shaft to reduce the minimum operating speed. The reverse gear adopts a planetary mechanism, which greatly reduces the reverse speed and increases the safety of reversing.

[0023] This reduces the length of the gearbox, saves manufacturing costs, and allows it to be adapted to a compact cab;

[0024] The system employs a main transmission gear set with four speed ratios and a secondary transmission gear mechanism with three speed ratios, working in conjunction with a planetary gear mechanism to achieve 12 forward gears and 12 reverse gears, meeting the user's operational needs under different working conditions and improving operational efficiency. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] In the diagram: 1-Input shaft; 2-Second gear drive gear; 3-Third gear drive gear; 4-Third and fourth gear engagement seats; 5-Third and fourth gear engagement sleeves; 6-Fourth gear drive gear; 7-Middle gear drive gear; 8-Middle gear engagement sleeve; 9-Middle gear engagement seat; 10-Intermediate shaft; 11-First gear driven gear; 12-First and second gear engagement seats; 13-First and second gear engagement sleeves; 14-Second gear driven gear; 15-Third gear driven gear; 16-Fourth gear driven gear; 17-High and low gear engagement seats; 18-Middle gear driven gear engagement sleeve; 19-Low gear driven gear; 20-Output shaft; 21-Planetary gear set; 22-Shuttle sleeve; 23-First gear drive gear; 24-Low gear drive gear. Detailed Implementation

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0029] like Figure 1 As shown, the 12+12 gear tractor transmission system includes an input shaft 1, an intermediate shaft 10, and an output shaft 20. The output end of the output shaft 20 is connected to a planetary gear set 21, and a shuttle sleeve 22 is connected to the planetary gear set 21. The input shaft 1, the intermediate shaft 10, and the output shaft 20 are connected to each other through the gear set. The housing of the planetary gear set 21 is fixed to the housing of the gearbox.

[0030] The planetary gear set 21 and the shuttle sleeve 22 form a planetary shuttle mechanism. The shuttle mechanism consists of a gear ring, six sets of double-row planetary gears, and an input shaft 1. The output shaft 20 is the sun gear shaft, which is the sun gear shaft of this device, and transmits power to this device. The sun gear shaft and the planetary gear set are always meshed and rotating. The planetary gear set 21 and the gear ring are always meshed and rotating. Three sets of double-row planetary gears are pre-assembled on the planet carrier. The planet carrier and the planetary gear system form the planet carrier gear assembly. The internal gear ring is fixed. Therefore, when the sun gear rotates, the planet carrier gear assembly always rotates synchronously. The end of this device is designed with a spline meshing sleeve. The spline meshing sleeve is fitted on the small bevel gear shaft and is constantly meshed with it through the spline. The above mechanism is mainly used to control the on and off of power and the change of transmission direction.

[0031] The gear set includes a second-speed drive gear 2 and a third-speed drive gear 3 connected to the input shaft 1. A fourth-speed drive gear 6 shaft is coaxially rotatable at the end of the input shaft 1. A third- and fourth-speed meshing sleeve 5 is slidably provided between the third-speed drive gear and the fourth-speed drive gear 6 shaft. A third- and fourth-speed meshing seat 4 is connected to the third- and fourth-speed meshing sleeve 5.

[0032] A middle gear drive gear 7 is rotatably mounted on the shaft of the fourth gear drive gear 6, and a middle gear engagement sleeve 8 is slidably mounted on the shaft of the fourth gear drive gear 6. The middle gear engagement sleeve 8 is connected to a middle gear engagement seat 9.

[0033] The gear set includes a third-speed driven gear 15 and a fourth-speed driven gear 16 fixedly connected to the intermediate shaft 10, and also includes a first-speed driven gear 11 and a second-speed driven gear 14 rotatably connected to the intermediate shaft 10. A first-speed and second-speed engagement sleeve 13 is slidably provided between the first-speed and second-speed driven gear 11 and the second-speed driven gear 14, and a first-speed and second-speed engagement seat 12 is connected to the first-speed and second-speed engagement sleeve 13.

[0034] The gear set includes a high and low gear engagement seat 17 connected to the output shaft 20, a slidingly mounted intermediate gear driven gear engagement sleeve 18 on the high and low gear engagement seat 17, and a low gear driven gear 19 rotatably mounted on the output shaft 20.

[0035] The second gear drive gear 2 meshes with the second gear driven gear 14.

[0036] The third-speed drive gear 3 meshes with the third-speed driven gear 15.

[0037] The fourth gear drive gear 6 meshes with the fourth gear driven gear 16.

[0038] The intermediate gear drive gear 7 meshes with the intermediate gear driven gear meshing sleeve 18.

[0039] A first-gear drive gear 23, which meshes with a first-gear driven gear 11, is fixedly connected to the input shaft 1.

[0040] A low-gear drive gear 24, which meshes with the low-gear driven gear 19, is fixedly connected to the shaft of the fourth-gear drive gear 6.

[0041] The transmission route of this device is as follows:

[0042] High-speed forward first gear: Input shaft 1 to first gear driven gear 11 to first and second gear engagement sleeve 13 to first and second gear engagement seat 12 to intermediate shaft 10 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22.

[0043] High-speed forward second gear: Input shaft 1 to second gear drive gear 2 to second gear driven gear 14 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to intermediate gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0044] High-speed forward three gears: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to third gear drive gear 3 to third gear driven gear 15 to intermediate shaft 10 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0045] High-speed forward fourth gear: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to fourth gear drive gear 6 to fourth gear driven gear 16 to intermediate shaft 10 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0046] Forward gear (medium speed): Input shaft 1 to first gear driven gear 11 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear driving gear 6 to intermediate gear engagement seat 9 to intermediate gear engagement sleeve 8 to intermediate gear driving gear 7 to intermediate gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0047] Medium forward second gear: Input shaft 1 to second gear drive gear 2 to second gear driven gear 14 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear drive gear 6 to intermediate gear engagement seat 9 to intermediate gear engagement sleeve 8 to intermediate gear drive gear 7 to intermediate gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0048] Medium forward three gears: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to third gear drive gear 3 to third gear driven gear 15 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear drive gear 6 to intermediate gear engagement seat 9 to intermediate gear engagement sleeve 8 to intermediate gear drive gear 7 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0049] Medium forward fourth gear: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to fourth gear drive gear 6 to intermediate gear engagement seat 9 to intermediate gear engagement sleeve 8 to intermediate gear drive gear 7 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0050] Low speed forward first gear: Input shaft 1 to first gear driven gear 11 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear driving gear 6 to low gear driven gear 19 to intermediate gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0051] Low-speed forward second gear: Input shaft 1 to second gear drive gear 2 to second gear driven gear 14 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear drive gear 6 to low gear driven gear 19 to medium gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0052] Low-speed forward third gear: Input shaft 1 to third / fourth gear engagement seat 4 to third / fourth gear engagement sleeve 5 to third gear drive gear 3 to third gear driven gear 15 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear drive gear 6 to low gear driven gear 19 to medium gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0053] Low-speed forward fourth gear: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to fourth gear drive gear 6 to low gear driven gear 19 to medium gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to planetary gear set 21 to shuttle shift sleeve 22

[0054] High-speed reverse first gear: Input shaft 1 to first gear driven gear 11 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to intermediate gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to shuttle shift sleeve 22

[0055] High-speed reverse second gear: Input shaft 1 to second gear drive gear 2 to second gear driven gear 14 to first and second gear engagement sleeve 13 to first and second gear engagement seat 12 to intermediate shaft 10 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 21 to shuttle shift sleeve 22

[0056] High-speed reverse three gears: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to third gear drive gear 3 to third gear driven gear 15 to intermediate shaft 10 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to shuttle shifter sleeve 22

[0057] High-speed reverse fourth gear: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to fourth gear drive gear 6 to fourth gear driven gear 16 to intermediate shaft 10 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to shuttle shifter slide sleeve 22

[0058] Reverse gear at medium speed: Input shaft 1 to first gear driven gear 11 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear driving gear 6 to intermediate gear engagement seat 9 to intermediate gear engagement sleeve 8 to intermediate gear driving gear 7 to intermediate gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to shuttle shifter slide sleeve 22

[0059] Medium speed reverse second gear: Input shaft 1 to second gear drive gear 2 to second gear driven gear 14 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear drive gear 6 to intermediate gear engagement seat 9 to intermediate gear engagement sleeve 8 to intermediate gear drive gear 7 to intermediate gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to shuttle shifter sleeve 22

[0060] Medium speed reverse three gears: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to third gear drive gear 3 to third gear driven gear 15 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear drive gear 6 to intermediate gear engagement seat 9 to intermediate gear engagement sleeve 8 to intermediate gear drive gear 7 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to shuttle shifter slide sleeve 22

[0061] Medium speed reverse fourth gear: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to fourth gear drive gear 6 to intermediate gear engagement seat 9 to intermediate gear engagement sleeve 8 to intermediate gear drive gear 7 to intermediate gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to shuttle shifter slide sleeve 22

[0062] Low speed reverse first gear: Input shaft 1 to first gear driven gear 11 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear driving gear 6 to low gear driven gear 19 to intermediate gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to shuttle shifter slide sleeve 22

[0063] Low-speed reverse second gear: Input shaft 1 to second gear drive gear 2 to second gear driven gear 14 to first / second gear engagement sleeve 13 to first / second gear engagement seat 12 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear drive gear 6 to low gear driven gear 19 to medium gear driven gear engagement sleeve 18 to high / low gear engagement seat 17 to output shaft 20 to shuttle shift sleeve 22

[0064] Low-speed reverse three gears: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to third gear drive gear 3 to third gear driven gear 15 to intermediate shaft 10 to fourth gear driven gear 16 to fourth gear drive gear 6 to low gear driven gear 19 to medium gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to shuttle shifter slide sleeve 22

[0065] Low-speed reverse fourth gear: Input shaft 1 to third and fourth gear engagement seat 4 to third and fourth gear engagement sleeve 5 to fourth gear drive gear 6 to low gear driven gear 19 to medium gear driven gear engagement sleeve 18 to high and low gear engagement seat 17 to output shaft 20 to shuttle shift sleeve 22

[0066] The above-mentioned 12+12 gear transmission system, achieved through a simple gear set, meets the needs of different working conditions and improves the efficiency of transmission operations.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A 12+12 gear tractor transmission system characterized in that: It includes an input shaft (1), an intermediate shaft (10) and an output shaft (20). The output end of the output shaft (20) is connected to a planetary gear set (21). A shuttle-type sliding sleeve (22) is connected to the planetary gear set (21). The input shaft (1), the intermediate shaft (10) and the output shaft (20) are connected to each other through the gear set. The gear set includes a second-speed drive gear (2) and a third-speed drive gear (3) connected to the input shaft (1). A fourth-speed drive gear (6) shaft is coaxially rotatably provided at the end of the input shaft (1). A third- and fourth-speed meshing sleeve (5) is slidably provided between the third-speed drive gear and the fourth-speed drive gear (6) shaft. A middle gear drive gear (7) is rotatably mounted on the shaft of the fourth gear drive gear (6), and a middle gear meshing sleeve (8) is slidably mounted on the shaft of the fourth gear drive gear (6). The gear set includes a third-speed driven gear (15) and a fourth-speed driven gear (16) fixedly connected to the intermediate shaft (10), and also includes a first-speed driven gear (11) and a second-speed driven gear (14) rotatably connected to the intermediate shaft (10). A second-speed meshing sleeve (13) is slidably provided between the first-speed driven gear (11) and the second-speed driven gear (14).

2. The 12+12 range tractor transmission system of claim 1, wherein: The gear set includes a high and low gear engagement seat (17) connected to the output shaft (20), a slidingly disposed medium gear driven gear engagement sleeve (18) on the high and low gear engagement seat (17), and a low gear driven gear (19) rotatably mounted on the output shaft (20).

3. The 12+12 range tractor transmission system of claim 1, wherein: The second-gear drive gear (2) meshes with the second-gear driven gear (14).

4. The 12+12 range tractor transmission system of claim 1, wherein: The three-speed driving gear (3) meshes with the three-speed driven gear (15).

5. The 12+12 range tractor transmission system of claim 1, wherein: The shaft of the fourth-speed drive gear (6) meshes with the shaft of the fourth-speed driven gear (16).

6. The 12+12 range tractor transmission system of claim 2, wherein: The intermediate drive gear (7) meshes with the intermediate driven gear meshing sleeve (18).

7. The 12+12 range tractor transmission system of claim 2, wherein: A first-gear drive gear (23) that meshes with the first-gear driven gear (11) is fixedly connected to the input shaft (1), and a low-gear drive gear (24) that meshes with the low-gear driven gear (19) is fixedly connected to the shaft of the fourth-gear drive gear (6).

Images