Side power take-off structure of transmission and torque transmission method of side power take-off structure

Abstract

The invention relates to a transmission, and provides a side power takeoff structure of a transmission and a torque transmission method of the side power takeoff structure in order to solve the technical problems that an existing side power takeoff is complex in structure, low in transmission efficiency and the like. The power takeoff output shaft is sequentially sleeved with a power takeoff gear shifting gear hub and a power takeoff transmission gear. The power takeoff transmission gear is sleeved on the power takeoff output shaft through an output shaft needle bearing; a power takeoff connecting chain is arranged between the power takeoff transmission gear and the main box intermediate shaft; a power takeoff output shaft outer spline is arranged on the power takeoff output shaft, an inner spline of the power takeoff gear shifting gear hub is meshed with the power takeoff output shaft outer spline, and a power takeoff gear shifting sliding sleeve is arranged between the power takeoff gear shifting gear hub and the power takeoff transmission gear. An internal spline of the power takeoff gear shifting sliding sleeve is meshed with an external spline of the power takeoff gear shifting gear hub; during gear engaging, the shifting fork drives the power takeoff gear shifting sliding sleeve to move towards the power takeoff transmission gear end and is meshed with the external spline of the power takeoff transmission gear end.

Description

Technical Field

[0001] The present invention relates to a transmission, and more particularly to a side power take-off structure of a transmission and its torque transmission method. Background Art

[0002] The power take-off of a transmission obtains power from the extended intermediate shaft of the transmission through the hollow shaft of the power take-off, then transmits the power to the input gear through the engaged gear sleeve, and finally outputs the power through the gear shaft and the output flange. The power take-off is usually connected to the low-speed gear of the gearbox or the output shaft of the auxiliary box to output power to an external working device. According to different power output forms, the power take-off can be divided into side, front, rear power output forms of the transmission and front power output form of the engine.

[0003] The main and auxiliary box intermediate shafts of a single intermediate shaft transmission usually cross-distribute. To ensure better radial force distribution of the gears in the transmission, the main box intermediate shaft is usually on the lower right side of the second shaft, and the auxiliary box intermediate shaft is on the lower left side of the second shaft; the side power take-off of the transmission usually obtains power from the main box intermediate shaft through gear meshing; the side power take-off can be divided into left-side power take-off and right-side power take-off. Since the exhaust pipe is installed on the right side of the transmission, most of the existing side power take-offs use left-side power take-off. When installing the side power take-off, it is necessary to avoid the space of the auxiliary box from the axis of the output shaft of the side power take-off, and this space layout limitation will cause the axis of the output shaft of the side power take-off to be far from the center position of the intermediate shaft.

[0004] Chinese Patent with application number CN202410776193.3 discloses a left power take-off component of a transmission, which uses multi-stage gear meshing to gradually transmit torque to the output shaft of the side power take-off to achieve long-distance power take-off and torque transmission; however, the device structure of multi-stage gear meshing is complex, there are many gear meshing pairs, the torque transmission efficiency is low, and at the same time, due to the axial force generated by the helical gear, there is a certain bending moment on the gear and the power take-off shaft, which is not conducive to the stable operation of the bearing, the failure rate is relatively high, and it requires the cooperation of many multi-stage gears, bearings and intermediate shafts, etc., which undoubtedly increases the production cost and manufacturing cost, and is also not conducive to later maintenance. Summary of the Invention

[0005] The purpose of the present invention is to solve the technical problems of the complex structure, low transmission efficiency, high failure rate of the side power take-off of the existing transmission, as well as relatively high production cost and manufacturing cost, and to propose a side power take-off structure of a transmission and its torque transmission method.

[0006] To achieve the above purpose, the technical solution proposed by the present invention is as follows:

[0007] A side power take-off structure of a transmission, including a power take-off component connected to the main box of the transmission. A power take-off connection port is provided on the outer side of the housing of the main box of the transmission. The power take-off component is connected to the main box intermediate shaft in the main box of the transmission through the power take-off connection port. The special feature is that:

[0008] The power take-off assembly includes a power take-off housing, a power take-off output shaft, and a power take-off output flange. The front end of the power take-off output shaft is located inside the power take-off housing, and the rear end extends outside the power take-off housing and is connected to the power take-off output flange. The power take-off output flange is used to connect to an external power take-off device. A power take-off shift gear hub and a power take-off drive gear are sequentially sleeved on the power take-off output shaft located inside the power take-off housing from front to back;

[0009] The power take-off drive gear is sleeved on the power take-off output shaft through an output shaft needle bearing; a power take-off connecting chain is arranged between the power take-off drive gear and the intermediate shaft of the main box for realizing torque transmission between the intermediate shaft of the main box and the power take-off output shaft;

[0010] The power take-off output shaft is provided with an external spline of the power take-off output shaft. The internal spline of the power take-off shift gear hub meshes with the external spline of the power take-off output shaft. A power take-off shift sleeve is arranged at the connection end of the power take-off shift gear hub and the power take-off drive gear. The power take-off shift sleeve is connected to an external shift fork for realizing axial movement of the power take-off shift sleeve; before shifting gears, the internal spline of the power take-off shift sleeve meshes with the external spline of the power take-off shift gear hub, and when shifting gears, its internal spline simultaneously meshes with the external splines of the power take-off shift gear hub and the power take-off drive gear for realizing torque transmission between the power take-off drive gear and the power take-off output shaft.

[0011] Further, external teeth on the shaft are arranged between two main box intermediate shaft gears on the main box intermediate shaft. One end of the power take-off connecting chain is connected to the external teeth on the shaft, and the other end is connected to the power take-off drive gear for realizing long-distance torque transmission between the main box intermediate shaft and the power take-off output shaft.

[0012] Further, the power take-off connecting chain is a power take-off toothed chain. One end of the power take-off toothed chain is meshed and connected to the external teeth on the shaft, and the other end is meshed and connected to the power take-off drive gear for torque transmission between the main box intermediate shaft and the power take-off output shaft.

[0013] Further, retaining rings are arranged on both sides of the power take-off drive gear for restricting axial movement of the power take-off drive gear.

[0014] Further, two roller bearings are fixedly arranged on the inner wall of the power take-off housing. The front end of the power take-off output shaft is movably connected to the inner wall of the power take-off housing through the two roller bearings.

[0015] Further, both of the two roller bearings are cylindrical roller bearings.

[0016] Further, the rear end of the power take-off output shaft is connected to the power take-off output flange by splines or interference fit.

[0017] Further, the power take-off housing is fixedly connected to the power take-off connection port through power take-off fastening bolts.

[0018] The present invention also proposes a torque transmission method for the above-mentioned side power take-off structure of the transmission, which is characterized in that:

[0019] The input torque of the engine is transmitted to the power take-off drive gear through the power take-off connecting chain via the intermediate shaft of the main case; the power take-off shift sleeve realizes the gear shifting and gear disengaging functions of the power take-off assembly under the control of an external shift fork;

[0020] Before gear shifting, the internal spline of the power take-off shift sleeve is constantly engaged with the external spline of the power take-off shift gear hub;

[0021] When gear shifting, under the control of the external shift fork, the power take-off shift sleeve moves towards the power take-off drive gear, and its internal spline is simultaneously engaged with the external splines of both the power take-off shift gear hub and the power take-off drive gear. The power take-off drive gear outputs the torque to the power take-off output shaft via the power take-off shift sleeve and the power take-off shift gear hub, completing the torque transmission;

[0022] When gear disengaging, under the control of the external shift fork, the power take-off shift sleeve moves towards the power take-off shift gear hub, and its internal spline disengages from the external spline of the power take-off drive gear, stopping the torque transmission.

[0023] Advantages of the present invention:

[0024] 【1】For the side power take-off structure of the transmission of the present invention, there is no need for multi-stage gears for torque transmission. The long-distance torque transmission between the intermediate shaft of the main case and the power take-off output shaft can be achieved through the power take-off connecting chain, greatly improving the torque transmission efficiency, ensuring the smooth operation of the bearings. This side power take-off structure significantly reduces the use of meshing teeth, effectively reducing the failure rate of the device, saving production costs and manufacturing costs. Its structure is simple and easy to disassemble and assemble, facilitating later disassembly, inspection and maintenance, and extending the service life of the transmission.

[0025] 【2】The present invention sets external teeth on the intermediate shaft of the main case and connects the external teeth on the intermediate shaft with the power take-off drive gear through a power take-off tooth-shaped chain to achieve long-distance torque transmission. The power take-off tooth-shaped chain can effectively weaken the impact of the torque load at the input end of the intermediate shaft of the main case, eliminate the generation of axial force between teeth, ensure the stable operation of the transmission, and improve the torque transmission efficiency.

[0026] 【3】The present invention can achieve the torque transmission of the structure through two cylindrical roller bearings and one power take-off needle roller bearing. The two cylindrical roller bearings can bear large radial loads, reducing the use of bearings in the side power take-off assembly, saving production costs, and also ensuring the axial stability of the transmission and reducing the failure rate of the device.

[0027] 【4】The power take-off shifting sleeve of the present invention has a simple structure. The external shifting fork pushes the power take-off shifting sleeve to move axially, thereby realizing the switching of the power take-off function, ensuring the stability of the shifting process, and effectively reducing the failure rate of the device.

[0028] 【5】Circlips are arranged on both sides of the transmission gear of the power take-off of the present invention, effectively improving the stability of the transmission gear of the power take-off and preventing it from sliding axially. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic external structure diagram of the side power take-off structure of a transmission of the present invention connected to the main case of the transmission;

[0030] Figure 2 is a sectional view of the connection between the side power take-off structure and the main case of the transmission in an embodiment of the present invention;

[0031] Figure 3 is a sectional view of the connection structure between the side power take-off structure and the main case of the transmission in an embodiment of the present invention;

[0032] Figure 4 is a schematic structural diagram of the intermediate shaft of the main case in an embodiment of the present invention;

[0033] Figure 5 is a schematic structural diagram of the output shaft of the power take-off in an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of the positional relationship among the power take-off shifting gear hub, the power take-off shifting sleeve and the power take-off transmission gear in an embodiment of the present invention;

[0035] Figure 7 is a flowchart of the torque transmission method of the side power take-off structure of a transmission of the present invention; Reference numerals:

[0036] 1 - Transmission main case, 2 - Intermediate shaft of the main case, 3 - Power take-off housing, 4 - Output shaft of the power take-off, 5 - Output flange of the power take-off, 6 - Shifting gear hub of the power take-off, 7 - Transmission gear of the power take-off, 8 - Output shaft needle bearing, 9 - Power take-off connecting chain, 10 - External spline of the output shaft of the power take-off, 11 - Shifting sleeve of the power take-off, 12 - Gear on the intermediate shaft of the main case, 13 - External teeth on the intermediate shaft, 14 - Roller bearing, 15 - Power take-off fastening bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] As Figure 1 shown, a side power take-off structure of a transmission includes a power take-off assembly connected to the transmission main case 1. A power take-off connection port is provided on the outer side of the housing of the transmission main case 1. The power take-off assembly is connected to the intermediate shaft 2 in the transmission main case 1 through the power take-off connection port;

[0038] As Figure 2 and Figure 3 shown, the power take-off assembly includes a power take-off housing 3, a power take-off output shaft 4, and a power take-off output flange 5. The power take-off housing 3 is fixed to the power take-off connection port by power take-off fastening bolts 15. The front end of the power take-off output shaft 4 is located inside the power take-off housing 3. Two roller bearings 14 are fixedly arranged on the inner wall of the power take-off housing 3. Cylindrical roller bearings can withstand large radial loads. Therefore, cylindrical roller bearings are used for the roller bearings 14. The front end of the power take-off output shaft 4 is movably connected to the inner wall of the power take-off housing 3 through two cylindrical roller bearings. This not only reduces the bearing usage of the side power take-off assembly, saves production costs, but also ensures the axial stability of the transmission and reduces the device failure rate;

[0039] The rear end of the power take-off output shaft 4 extends out of the power take-off housing 3 and is connected to the power take-off output flange 5 by spline or interference fit. The power take-off output flange 5 is used to connect to an external power take-off device. A power take-off shift gear hub 6 and a power take-off drive gear 7 are sequentially sleeved on the power take-off output shaft 4 located inside the power take-off housing 3 from front to back;

[0040] As Figure 5 shown, the power take-off drive gear 7 is sleeved on the power take-off output shaft 4 through an output shaft needle bearing 8. Retaining rings are arranged on both sides of the power take-off drive gear 7 to limit the axial movement of the power take-off drive gear 7; A power take-off connecting chain 9 is arranged between the power take-off drive gear 7 and the main box intermediate shaft 2. The power take-off connecting chain 9 adopts a power take-off toothed chain. As Figure 4 shown, an external gear on the intermediate shaft is arranged between two main box intermediate shaft gears 12 of the main box intermediate shaft 2. One end of the power take-off toothed chain is meshed and connected to the external gear on the intermediate shaft, and the other end is meshed and connected to the power take-off drive gear 7 for torque transmission between the main box intermediate shaft 2 and the power take-off output shaft 4;

[0041] As Figure 6 shown, an external spline of the power take-off output shaft is arranged on the power take-off output shaft 4. The internal spline of the power take-off shift gear hub 6 meshes with the external spline of the power take-off output shaft. A power take-off shift sleeve 11 is arranged at the connection end of the power take-off shift gear hub 6 and the power take-off drive gear 7. The power take-off shift sleeve 11 is connected to an external shift fork to realize the axial movement of the power take-off shift sleeve 11; Before shifting gears, the internal spline of the power take-off shift sleeve 11 meshes with the external spline of the power take-off shift gear hub 6. When shifting gears, its internal spline meshes with the external splines of both the power take-off shift gear hub 6 and the power take-off drive gear 7 at the same time to realize torque transmission between the power take-off drive gear 7 and the power take-off output shaft 4.

[0042] The power take-off drive gear 7 can be designed with different gear parameters according to actual requirements to achieve power take-off conditions with different speed ratios, expanding the application range and applicability of the power take-off assembly.

[0043] As Figure 7 shown, the present invention also provides a torque transmission method using the above-mentioned side power take-off structure of the transmission, and the torque transmission process is as follows:

[0044] The input torque of the engine is transmitted to the power take-off drive gear 7 through the power take-off connecting chain 9 on the intermediate shaft 2 of the main box; the power take-off shift sleeve 11 realizes the functions of engaging and disengaging the power take-off assembly under the control of an external shift fork;

[0045] Before engaging, the internal spline of the power take-off shift sleeve 11 is always engaged with the external spline of the power take-off shift gear hub 6;

[0046] When engaging, under the control of an external shift fork, the power take-off shift sleeve 11 moves towards the power take-off drive gear 7, and its internal spline is simultaneously engaged with the external splines of both the power take-off shift gear hub 6 and the power take-off drive gear 7. The power take-off drive gear 7 outputs the torque to the power take-off output shaft 4 through the power take-off shift sleeve 11 and the power take-off shift gear hub 6, completing the torque transmission;

[0047] When disengaging, under the control of an external shift fork, the power take-off shift sleeve 11 moves towards the power take-off shift gear hub 6, and its internal spline is disengaged from the external spline of the power take-off drive gear 7, stopping the torque transmission.

Claims

1. A side power take-off structure of a transmission, comprising a power take-off assembly connected to the main transmission case (1). A power take-off connection port is provided on the outer side of the housing of the main transmission case (1). The power take-off assembly is connected to the main case intermediate shaft (2) inside the main transmission case (1) through the power take-off connection port. It is characterized in that: The power take-off assembly includes a power take-off housing (3), a power take-off output shaft (4) and a power take-off output flange (5). The front end of the power take-off output shaft (4) is located inside the power take-off housing (3), and the rear end extends outside the power take-off housing (3) and is connected to the power take-off output flange (5). The power take-off output flange (5) is used to connect to an external power take-off device. A power take-off shift gear hub (6) and a power take-off transmission gear (7) are sequentially sleeved on the power take-off output shaft (4) inside the power take-off housing (3) from front to back; The power take-off transmission gear (7) is sleeved on the power take-off output shaft (4) through an output shaft needle bearing (8); A power take-off connection chain (9) is provided between the power take-off transmission gear (7) and the main case intermediate shaft (2) for realizing torque transmission between the main case intermediate shaft (2) and the power take-off output shaft (4); A power take-off output shaft external spline (10) is provided on the power take-off output shaft (4). The internal spline of the power take-off shift gear hub (6) meshes with the power take-off output shaft external spline (10). A power take-off shift sleeve (11) is provided at the connection end of the power take-off shift gear hub (6) and the power take-off transmission gear (7). The power take-off shift sleeve (11) is connected to an external shift fork for realizing the axial movement of the power take-off shift sleeve (11); Before shifting gears, the internal spline of the power take-off shift sleeve (11) meshes with the external spline of the power take-off shift gear hub (6), and during shifting gears, its internal spline simultaneously meshes with the external splines of the power take-off shift gear hub (6) and the power take-off transmission gear (7) for realizing torque transmission between the power take-off transmission gear (7) and the power take-off output shaft (4).

2. The side power take-off structure of a transmission according to claim 1, characterized in that: An external tooth on the intermediate shaft is provided between the two main case intermediate shaft gears (12) of the main case intermediate shaft (2). One end of the power take-off connection chain (9) is connected to the external tooth on the intermediate shaft, and the other end is connected to the power take-off transmission gear (7) for realizing long-distance torque transmission between the main case intermediate shaft (2) and the power take-off output shaft (4).

3. The side power take-off structure of a transmission according to claim 2, characterized in that: The power take-off connection chain (9) is a power take-off toothed chain. One end of the power take-off toothed chain meshes and connects with the external tooth on the intermediate shaft, and the other end meshes and connects with the power take-off transmission gear (7) for torque transmission between the main case intermediate shaft (2) and the power take-off output shaft (4).

4. The side power take-off structure of a transmission according to claim 3, characterized in that: Circlips are provided on both sides of the power take-off transmission gear (7) for restricting the axial movement of the power take-off transmission gear (7).

5. The side power take-off structure of a transmission according to claim 4, characterized in that: On the inner wall of the power take-off housing (3), two roller bearings (14) are fixedly arranged, and the front end of the power take-off output shaft (4) is movably connected to the inner wall of the power take-off housing (3) through the two roller bearings (14).

6. The side power take-off structure of a transmission according to claim 5, wherein: Both of the two roller bearings (14) are cylindrical roller bearings.

7. The side power take-off structure of a transmission according to claim 6, wherein: The rear end of the power take-off output shaft (4) and the power take-off output flange (5) are connected by splines or an interference fit.

8. The side power take-off structure of a transmission according to claim 7, wherein: The power take-off housing (3) is fixedly connected to the power take-off connection port through power take-off fastening bolts (15).

9. A torque transmission method for the side power take-off structure of a transmission according to any one of claims 1-8, wherein: The input torque of the engine is transmitted to the power take-off drive gear (7) through the power take-off connecting chain (9) via the intermediate shaft (2) of the main case; the power take-off shift sleeve (11) realizes the functions of engaging and disengaging the power take-off assembly under the control of an external shift fork; Before engaging, the internal splines of the power take-off shift sleeve (11) are constantly meshed with the external splines of the power take-off shift gear hub (6); When engaging, under the control of an external shift fork, the power take-off shift sleeve (11) moves towards the power take-off drive gear (7), and its internal splines are simultaneously meshed with the external splines of the power take-off shift gear hub (6) and the external splines of the power take-off drive gear (7). The power take-off drive gear (7) outputs the torque to the power take-off output shaft (4) through the power take-off shift sleeve (11) and the power take-off shift gear hub (6) to complete torque transmission; When disengaging, under the control of an external shift fork, the power take-off shift sleeve (11) moves towards the power take-off shift gear hub (6), and its internal splines are disengaged from the external splines of the power take-off drive gear (7) to stop torque transmission.

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