A tractor power reversing and power high and low gear shifting transmission device

Abstract

The present invention is a tractor power reversing and power high and low gear shifting transmission device, comprising a power high and low gear area, a main speed change area, a power reversing area, an auxiliary speed change area and a creeping gear area which are sequentially arranged in a box body from top to bottom. The power high and low gear clutch of the present invention is integrated on the input shaft, the forward gear clutch and the reverse gear clutch are arranged separately, and the reverse gear clutch is raised relative to the bottom of the box, so as to reduce the reverse gear clutch from being soaked in the gearbox body oil, and the reverse gear clutch can be not completely immersed in the oil for a long time. If the friction plate is soaked in the oil, the oil groove on the friction plate cannot remove the oil in time during operation, and the friction coefficient will be reduced, resulting in an excessively long friction time when the clutch is working, relatively large sliding wear, and poor heat dissipation; the existing power high and low gear clutch is arranged separately, and the forward clutch and the reverse gear clutch are integrated on the shaft, and this shaft is at the bottom of the gearbox and is completely immersed in the oil.

Description

Technical Field

[0001] The invention relates to a gearbox transmission mechanism, in particular to a tractor power reversing and power high and low gear shifting transmission device. Background Art

[0002] The gearbox adopts multiple wet clutches and auxiliary transmission configuration meshing sleeves, and realizes uninterrupted gear shifting operation of the transmission through a hydraulic control system. Compared with traditional mechanical gear shifting technology, this gearbox shifting technology realizes continuous power output, improves the driver's operating comfort, reduces the operating difficulty and labor intensity to a certain extent, and improves the operation quality and work efficiency. However, with the increasing number of tractor operation projects and supporting agricultural machinery, tractors need to be set with multiple gears. The more gears, the more complex the structure, which puts higher requirements on the market positioning and gear shifting quality of tractors. Under this trend, the existing power shift gearbox has certain defects. Its main disadvantage is the complex structure, such as Figure 1 As shown, the four power shifting gears require four wet clutches (C1, C2, C3, C4) to control, which is complex to manufacture, high in cost, and has a long axial dimension. Summary of the invention

[0003] In order to solve the problems of complex manufacturing, high cost and long axial dimension of the current gearbox, the present invention provides a tractor power reversing and power high and low gear shifting transmission device, including a power high and low gear area, a main speed change area, a power reversing area, an auxiliary speed change area and a crawling gear area arranged in a box body from top to bottom, the power high and low gear area includes an input shaft, and a power high gear gear set, a power high and low gear clutch and a power low gear gear set are arranged on the input shaft in sequence, the main speed change area includes an I shaft and a III shaft both connected to the input shaft, and a II shaft is also connected between the I shaft and the III shaft, and the A main speed shifting device is provided on both shaft I and shaft III, the power reversing area includes a reversing shaft I connected to shaft I and a reversing shaft II connected to shaft II, the reversing shaft I is connected to a reverse gear set and a reverse clutch, the reversing shaft II is provided with a forward clutch, the auxiliary speed change area includes an auxiliary speed driving gear shaft coaxially connected to the reversing shaft II, the auxiliary speed driving gear shaft is provided with a reverse gear driven by the reverse gear set, the auxiliary speed driving gear shaft is connected to the crawling gear area, and the auxiliary speed driving gear shaft and the crawling gear area are also connected to the output shaft.

[0004] Preferably, a secondary speed change gear set is provided on the secondary speed change driving gear shaft.

[0005] Furthermore, the auxiliary speed change gear set includes a middle gear, a high gear and a low gear. Three gears are set in the auxiliary speed change area, which greatly simplifies the mechanical structure, improves reliability and reduces manufacturing costs.

[0006] Preferably, the main speed shifting device on the I-axis is an even-numbered gear shifting device, and the even-numbered gear shifting device includes an even-numbered gear set and a synchronizer arranged on the I-axis.

[0007] Furthermore, the even-numbered gear set includes a II gear driving gear, a IV gear driving gear, a VI gear driving gear and a VIII gear driving gear.

[0008] Preferably, the main speed shifting device on the III shaft is an odd-numbered gear shifting device, and the odd-numbered gear shifting device includes an odd-numbered gear set and a synchronizer arranged on the III shaft.

[0009] Furthermore, the odd-numbered gear set includes a first gear driving gear, a third gear driving gear, a fifth gear driving gear and a seventh gear driving gear.

[0010] Preferably, the shaft II is provided with a passive gear drivingly connected to the main speed change gear shifting device. The passive gears on the shaft II corresponding to the I and II gears are shared by the I and II gears, the passive gears on the shaft II corresponding to the III and IV gears are shared by the III and IV gears, the passive gears on the shaft II corresponding to the V and VI gears are shared by the V and VI gears, and the passive gears on the shaft II corresponding to the VII and VIII gears are shared by the VII and VIII gears.

[0011] Furthermore, the input shaft is connected to the I shaft via a transmission shaft, a transmission gear set is provided on the transmission shaft, and the transmission shaft is connected to the I shaft via a spline.

[0012] Preferably, it further comprises a transfer case, wherein a transfer case output shaft is axially arranged in the transfer case, a transfer case gear set is arranged on the transfer case output shaft, the transfer case gear set is meshed with the output shaft gear set on the output shaft, and a transfer case clutch assembly is also arranged on the transfer case output shaft.

[0013] Beneficial effects: 1. The power high and low gear clutch of the present invention is integrated on the input shaft, the forward gear clutch and the reverse gear clutch are arranged separately, and the reverse gear clutch is raised relative to the bottom of the box, which reduces the reverse gear clutch from being soaked in the gearbox body oil, and allows the reverse gear clutch to be completely immersed in the oil for a short time. If the friction plate is soaked in the oil, the oil groove on the friction plate cannot remove the oil in time during operation, and the friction coefficient will be reduced, resulting in an excessively long friction time when the clutch is working, relatively large sliding friction, and poor heat dissipation; the existing power high and low gear clutch is arranged separately, and the forward clutch and the reverse gear clutch are integrated on the shaft, and this shaft is at the bottom of the gearbox and is completely immersed in the oil;

[0014] 2. An additional gear is added to the auxiliary transmission area. The auxiliary transmission area has three gears, plus the crawler gear, which can achieve 32 forward gears and 32 reverse gears as a whole. It greatly simplifies the mechanical structure, improves reliability, and reduces manufacturing costs. It is particularly suitable for the existing mechanical manufacturing level of Chinese agricultural machinery enterprises and has a high cost performance and product grade. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the existing gearbox structure;

[0016] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 3 for Figure 2 Middle BB section view;

[0018] Figure 4 for Figure 2 Middle AA section view;

[0019] In the figure: 1. Power high and low gear area; 2. Main speed change area; 3. Power reversing area; 4. Auxiliary speed change area; 5. Creeping gear area; 6. Input shaft; 7. Power high gear gear set; 8. Power high and low gear clutch; 9. Power low gear gear set; 10. I shaft; 11. II shaft; 12. III shaft; 13. Reversing shaft I; 14. Reversing shaft II; 15. Reverse gear set; 16. Reverse clutch; 17. Forward clutch; 18. Auxiliary speed change driving gear shaft; 19. Reverse gear; 20. Output shaft; 21. Intermediate gear; 22. High gear; 23. , low gear; 24, even gear gear set; 25, synchronizer; 26, II gear driving gear; 27, IV gear driving gear; 28, VI gear driving gear; 29, VIII gear driving gear; 30, odd gear gear set; 31, I gear driving gear; 32, III gear driving gear; 33, V gear driving gear; 34, VII gear driving gear; 35, passive gear; 36, transmission shaft; 37, transmission gear set; 38, transfer case; 39, transfer case output shaft; 40, transfer case gear set; 41, output shaft gear set; 42, transfer case clutch assembly. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0021] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is 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 of the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0022] Example 1

[0023] A tractor power reversing and power high and low gear shifting transmission device, comprising a power high and low gear area 1, a main speed change area 2, a power reversing area 3, an auxiliary speed change area 4 and a creeping gear area 5 arranged in a box body from top to bottom, the power high and low gear area 1 comprises an input shaft 6, and a power high gear gear set 7, a power high and low gear clutch 8 and a power low gear gear set 9 are arranged in sequence on the input shaft 6, the main speed change area 2 comprises an I shaft 10 and a III shaft 12 both connected to the input shaft 6, a II shaft 11 is further connected between the I shaft 10 and the III shaft 12, the I shaft 10 and the III shaft 12 are both provided with a main speed change shifting device, the power reversing area 3 comprises a reversing shaft I 13 connected to the I shaft 10 and a reversing shaft II 14 connected to the II shaft 11, the reversing shaft I 13 is connected to a reverse gear set 15 and a reverse clutch 16, the reversing shaft II 14 is provided with a forward clutch 17, the auxiliary speed change area 4 comprises an auxiliary speed change driving gear shaft 18 coaxially connected to the reversing shaft II 14, the auxiliary speed change driving gear shaft 18 is provided with a reverse gear 19 drivingly connected to the reverse gear set 15, the auxiliary speed change driving gear shaft 18 is connected to the crawling gear area 5, and the auxiliary speed change driving gear shaft 18 and the crawling gear area 5 are also connected to an output shaft 20.

[0024] The auxiliary transmission gear set is arranged on the auxiliary transmission driving gear shaft 18. The auxiliary transmission gear set includes a middle gear 21, a high gear 22 and a low gear 23. Three gears are arranged in the auxiliary transmission area 4, which greatly simplifies the mechanical structure, improves reliability and reduces manufacturing cost.

[0025] The main speed change gear shifting device on the I shaft 10 is an even-numbered gear shifting device, and the even-numbered gear shifting device includes an even-numbered gear set 24 and a synchronizer 25 arranged on the I shaft 10. The even-numbered gear set 24 includes a II gear driving gear 26, a IV gear driving gear 27, a VI gear driving gear 28, and a VIII gear driving gear 29.

[0026] The main speed change gear shifting device on the III shaft 12 is an odd-numbered gear shifting device, which includes an odd-numbered gear set 30 and a synchronizer 25 arranged on the III shaft 12. The odd-numbered gear set 30 includes a I gear driving gear 31, a III gear driving gear 32, a V gear driving gear 33 and a VII gear driving gear 34.

[0027] The II shaft 11 is provided with a passive gear 35 drivingly connected to the main speed change gear shifting device. The passive gear 35 on the II shaft 11 corresponding to the I gear and the II gear is shared by the I gear and the II gear, the passive gear 35 on the II shaft 11 corresponding to the III gear and the IV gear is shared by the III gear and the IV gear, the passive gear 35 on the II shaft 11 corresponding to the V gear and the VI gear is shared by the V gear and the VI gear, and the passive gear 35 on the II shaft 11 corresponding to the VII gear and the VIII gear is shared by the VII gear and the VIII gear.

[0028] The input shaft 6 is connected to the I shaft 10 through a transmission shaft 36, and a transmission gear set 37 is provided on the transmission shaft 36. The transmission shaft 36 is connected to the I shaft 10 through a spline. When the power high and low gear zone 1 selects a low gear, the input shaft 6 is directly connected to the III shaft 12 through the power low gear gear set 9. When the power high and low gear zone 1 selects a high gear, the power high gear gear set 7 on the input shaft 6 meshes with the transmission gear set 37 on the transmission shaft 36 to transmit power to the I shaft 10.

[0029] It also includes a transfer case 38, in which a transfer case output shaft 39 is axially arranged, and a transfer case gear set 40 is arranged on the transfer case output shaft 39. The transfer case gear set 40 is meshed with an output shaft gear set 41 on the output shaft 20, and a transfer case clutch assembly 42 is also arranged on the transfer case output shaft 39.

[0030] Working principle: when it is necessary to shift gears Ⅰ, Ⅲ, Ⅴ and Ⅶ, the power high and low gear zone 1 is set to low gear, the input shaft 6 is connected to the III shaft 12 through the power low gear gear set 9, the corresponding driving gear in the odd gear gear set 30 on the III shaft 12 drives the passive gear 35 on the II shaft 11 to rotate, and then the II shaft 11 transmits the power to the reversing shaft Ⅱ 14 (if reverse gear is required, the II shaft 11 transmits the power to the reversing shaft Ⅰ 13), the reversing shaft Ⅱ 14 transmits the power to the auxiliary transmission driving gear shaft 18, and then the gear position of the auxiliary transmission zone 4 is selected according to the needs, and the power is output from the output shaft 20, and then it is selected whether to connect with the transfer case 38 according to the needs.

[0031] When it is necessary to shift to the II, IV, VI and VIII forward gears, the power high and low gear zone 1 is set to the high gear, the power high gear gear set 7 on the input shaft 6 meshes with the transmission gear set 37 on the transmission shaft 36, and the power is transmitted to the transmission shaft 36, and the transmission shaft 36 transmits the power to the I shaft 10, and the corresponding driving gear in the even gear gear set 24 on the I shaft 10 drives the passive gear 35 on the II shaft 11 to rotate, and then the II shaft 11 transmits the power to the reversing shaft II 14 (if reverse gear is required, the II shaft 11 transmits the power to the reversing shaft I 13), and the reversing shaft II 14 transmits the power to the auxiliary transmission driving gear shaft 18, and then the gear position of the auxiliary transmission zone 4 is selected according to the needs, and the power is output from the output shaft 20, and then it is selected whether to connect with the transfer case 38 according to the needs.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tractor power reversing and power high and low gear shifting transmission device, characterized in that: The invention comprises a power high and low gear area (1), a main speed change area (2), a power reversing area (3), an auxiliary speed change area (4) and a crawling gear area (5) which are arranged in sequence in a housing from top to bottom. The power high and low gear area (1) comprises an input shaft (6), on which a power high gear gear set (7), a power high and low gear clutch (8) and a power low gear gear set (9) are arranged in sequence. The main speed change area (2) comprises an I shaft (10) and a III shaft (12) which are both connected to the input shaft (6), a II shaft (11) is further connected between the I shaft (10) and the III shaft (12), and a main speed change shifting device is arranged on the I shaft (10) and the III shaft (12). The power reversing area (3) comprises a main speed change shifting device which is connected to the I shaft (11). 0) and a reversing shaft II (14) connected to the II shaft (11), the reversing shaft I (13) being connected to a reverse gear set (15) and a reverse clutch (16), the reversing shaft II (14) being provided with a forward clutch (17), the auxiliary speed change section (4) comprising an auxiliary speed change driving gear shaft (18) being coaxially connected to the reversing shaft II (14), the auxiliary speed change driving gear shaft (18) being provided with a reverse gear spur (19) drivingly connected to the reverse gear set (15), the auxiliary speed change driving gear shaft (18) being connected to the crawling gear section (5), the auxiliary speed change driving gear shaft (18) and the crawling gear section (5) being further connected to an output shaft (20).

2. A tractor power reversing and power high and low gear shifting transmission device according to claim 1, characterized in that: The auxiliary speed change driving gear shaft (18) is provided with an auxiliary speed change gear set.

3. A tractor power reversing and power high and low gear shifting transmission device according to claim 2, characterized in that: The auxiliary speed change gear set comprises a middle gear (21), a high gear (22) and a low gear (23).

4. A tractor power reversing and power high and low gear shifting transmission device according to claim 1, characterized in that: The main speed change gear shifting device on the I shaft (10) is an even-numbered gear change gear, and the even-numbered gear change gear comprises an even-numbered gear gear set (24) and a synchronizer (25) arranged on the I shaft (10).

5. A tractor power reversing and power high and low gear shifting transmission device according to claim 4, characterized in that: The even-numbered gear set (24) comprises a II gear driving gear (26), a IV gear driving gear (27), a VI gear driving gear (28) and a VIII gear driving gear (29).

6. A tractor power reversing and power high and low gear shifting transmission device according to claim 1, characterized in that: The main speed change gear shifting device on the III shaft (12) is an odd-numbered gear change gear, and the odd-numbered gear change gear comprises an odd-numbered gear set (30) and a synchronizer (25) arranged on the III shaft (12).

7. A tractor power reversing and power high and low gear shifting transmission device according to claim 6, characterized in that: The odd-numbered gear set (30) comprises a first gear driving gear (31), a third gear driving gear (32), a fifth gear driving gear (33) and a seventh gear driving gear (34).

8. A tractor power reversing and power high and low gear shifting transmission device according to claim 1, characterized in that: The II shaft (11) is provided with a passive gear (35) which is transmission-connected to the main speed change gear shifting device.

9. A tractor power reversing and power high and low gear shifting transmission device according to claim 1, characterized in that: The input shaft (6) is connected to the I shaft (10) via a transmission shaft (36), a transmission gear set (37) is provided on the transmission shaft (36), and the transmission shaft (36) is connected to the I shaft (10) via a spline.

10. A tractor power reversing and power high and low gear shifting transmission device according to claim 1, characterized in that: The invention also comprises a transfer case (38), wherein a transfer case output shaft (39) is axially arranged in the transfer case (38), a transfer case gear set (40) is arranged on the transfer case output shaft (39), the transfer case gear set (40) is meshed with an output shaft gear set (41) on the output shaft (20), and a transfer case clutch engaging member (42) is also arranged on the transfer case output shaft (39).

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