Power takeoff adding structure of automatic transmission

Abstract

A power takeoff structure of an automatic transmission belongs to the technical field of automatic transmissions. A power takeoff driving gear structure is additionally arranged at the rear end of the driving chain wheel, a power takeoff driving gear of the driving chain wheel is in transmission connection with the power takeoff, and a needle bearing is radially additionally arranged between the driving chain wheel and the pump shell assembly. On the basis of an AT transmission and based on the principle of minimum variation, outward transmission of power is achieved by newly designing an oil pump driving chain wheel structure, a shell system is newly designed, and two power takeoff mounting windows are additionally arranged on the two sides of a shell. The requirement for additionally arranging the power takeoff of the automatic transmission is met, the power takeoff is laterally arranged, the axial length of the transmission can be shortened, meanwhile, the power takeoff can be selectively arranged on any side according to the arrangement of the whole vehicle, and the space pressure of the whole vehicle is relieved. Two sets of power takeoff devices can be assembled on the two sides of the AT transmission at the same time, the two sets of power takeoff devices can work at the same time, and the requirement that multiple functions of a special vehicle can be carried out at the same time can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic transmissions, and in particular relates to a structure for adding a power take-off to an automatic transmission. Background Art

[0002] With the rapid development of the automobile industry, the commercial vehicle sector has put forward higher and higher comfort requirements for driving and riding, especially for special vehicles used in specific professional fields such as crane trucks and road sweepers. The original requirements of only realizing special functions have gradually developed to paying equal attention to functionality and comfort.

[0003] To meet the comfort requirements of special vehicles, this can be achieved by selecting an automatic transmission, but most automatic transmissions on the current market do not have the ability to match a power take-off and cannot transmit power other than driving the vehicle to the outside, making it impossible to realize special vehicle lifting, cleaning and other functions. Summary of the invention

[0004] In order to solve the above technical problems, the present invention further provides an automatic transmission with an added power take-off structure, combined with the mainstream power take-off layout in the industry, and at the same time to alleviate the space pressure of the whole vehicle, the present invention is optimized and developed based on the AT transmission according to the lateral arrangement of the power take-off to meet the needs of the AT transmission matching the power take-off.

[0005] The technical solution adopted by the present invention is:

[0006] A structure for adding a power take-off to an automatic transmission comprises a transmission housing, a pump housing assembly, a front end cover, a driving sprocket, a hydraulic torque converter and an oil pump assembly; the driving sprocket is connected to the hydraulic torque converter, the driving sprocket and the oil pump assembly are wrapped between the front end cover and the pump housing assembly, the spline at the front end of the driving sprocket is connected to the oil pump assembly through a chain transmission, a power take-off driving gear structure is added to the rear end of the driving sprocket, the power take-off driving gear structure of the driving sprocket is connected to the power take-off, and a needle bearing is added radially between the driving sprocket and the pump housing assembly.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] Based on the AT transmission and the principle of minimum variation, the present invention realizes outward power transmission through a newly designed oil pump driving sprocket structure, a newly designed housing system, and two power take-off installation windows are added on both sides of the housing.

[0009] The present invention realizes the demand of adding a power take-off to an automatic transmission, and the power take-off is arranged laterally, which can shorten the axial length of the transmission. At the same time, the power take-off can be installed on any side according to the layout of the whole vehicle, thereby reducing the space pressure of the whole vehicle.

[0010] The present invention enables the AT transmission to be equipped with two sets of power take-offs on both sides at the same time, and the two sets of power take-offs can work at the same time, which can meet the requirements of special vehicles for performing multiple functions at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention;

[0012] Figure 2 It is a schematic diagram of the structure of the power take-off window of the present invention;

[0013] Figure 3 This is a schematic diagram of the installation of the power take-off window of the present invention;

[0014] Figure 4 It is a schematic diagram of the structure of the driving sprocket of the present invention;

[0015] Figure 5 is a main cross-sectional view of the driving sprocket of the present invention;

[0016] Figure 6 This is a left view of the power take-off window of the present invention;

[0017] Figure 7 This is a right view of the power take-off window of the present invention;

[0018] Figure 8 This is an axonometric view of the power take-off cover plate of the present invention;

[0019] Fig. 9 This is a main sectional view of a power take-off cover plate of the present invention;

[0020] Among them: 1. Transmission housing; 2. Friction reducing gasket; 3. Pump housing assembly; 4. Input shaft assembly; 5. Reaction shaft; 6. Needle bearing; 7. Chain; 8. Front cover; 9. Driving sprocket; 10. Torque converter; 11. Thrust bearing; 12. Oil pump assembly; 13. Bolts; 14. Sealing gasket; 15. Power take-off cover; 16. Power take-off driving gear structure. DETAILED DESCRIPTION

[0021] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0022] The AT transmission oil pump system is arranged at the front end of the transmission, between the torque converter 10 and the planetary gear mechanism.

[0023] like Figure 1As shown, the oil pump system is connected to the hydraulic torque converter 10 through the driving sprocket 9, the driving sprocket 9 and the oil pump assembly 12 (driven sprocket) are wrapped between the front cover 8 and the pump housing assembly 3, and the driving sprocket 9 and the oil pump assembly 12 are connected through the chain 7. The engine power is transmitted to the driving sprocket 9 through the hydraulic torque converter 10, and the driving sprocket 9 transmits the power to the oil pump assembly 12 through the chain 7, driving the oil pump assembly 12 to work.

[0024] like Figure 4 , Figure 5 As shown, a power take-off driving gear structure 16 is added to the rear end of the driving sprocket 9, which meshes with the power take-off input gear to transmit the power transmitted by the torque converter 10 to the power take-off and the oil pump assembly 12 at the same time;

[0025] like Figure 1 As shown, in order to meet the use requirements of the power take-off, a needle bearing 6 is radially added between the driving sprocket 9 and the pump housing assembly 3 to reduce friction, transfer load and support the rotational movement of the driving sprocket 9. The torque converter 10 is mounted on the rear end of the driving sprocket 9. The front end spline of the driving sprocket 9 is transmission-connected to the oil pump assembly 12 with the driven sprocket through the chain 7. The power take-off driving gear structure 16 of the driving sprocket 9 is transmission-connected to the power take-off.

[0026] The power is transmitted from the engine to the front end spline of the driving sprocket 9 through the torque converter 10. Part of the power is transmitted to the chain 7 through the driving sprocket 9 driving sprocket teeth, thereby driving the oil pump assembly 12 to work; the other part of the power is directly transmitted to the power take-off through the power take-off driving gear structure 16 of the driving sprocket 9, thereby driving the power take-off to work.

[0027] The left and right ends of the driving sprocket 9 are respectively the pump housing assembly 3 and the front cover 8. As the driving sprocket 9 moves, an axial force is generated in the direction of the front cover 8 (the front end of the transmission), so a thrust bearing 11 for bearing the axial thrust load is added between the driving sprocket 9 shaft and the front cover 8; in order to prevent the driving sprocket 9 from moving toward the rear of the transmission under certain specific working conditions and directly contacting the pump housing assembly 3 to generate friction, a friction-reducing gasket 2 is added between the driving sprocket 9 and the pump housing assembly 3 to reduce friction.

[0028] The transmission housing 1, the pump housing assembly 3, the input shaft assembly 4, the reaction shaft 5, and the front cover 8 need to adapt to the power take-off driving gear structure 16 added to the driving sprocket 9, and be designed to be adaptable in the axial and radial directions to ensure the movement space of the driving sprocket 9.

[0029] The pump housing assembly 3 is sleeved on the reaction shaft 5 , and the reaction shaft 5 is sleeved on the input shaft assembly 4 .

[0030] like Figure 2 , Figure 3As shown, in order to meet the installation requirements of the power take-off, the transmission housing 1 needs to be axially lengthened, and a power take-off window is added on each side of the transmission housing 1 (see Figure 6 , Figure 7 ), realize the connection with the power take-off and arrange the power take-off sideways,

[0031] According to the power take-off window, the power take-off cover 15 is newly designed (see Figure 8 , Fig. 9 ), when the power take-off is not installed, the power take-off window is sealed by the power take-off cover 15. The power take-off cover 15 can be directly installed on the power take-off window of the transmission housing 1 through the bolts 13, and a sealing gasket 14 is added between the power take-off cover 15 and the power take-off window to achieve a sealing effect; when a power take-off is required, the power take-off cover 15 can be directly removed and replaced with a power take-off.

[0032] Both power take-off windows can be connected to the power take-off, and the power take-off driving gear structure 16 of the internal driving sprocket 9 can transmit power outward at the two power take-off window positions. Therefore, the present invention can realize the function of matching the power take-off on either side or both sides of the transmission at the same time.

[0033] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An automatic transmission with a power take-off structure, comprising a transmission housing (1), a pump housing assembly (3), a front cover (8), a driving sprocket (9), a hydraulic torque converter (10) and an oil pump assembly (12); the driving sprocket (9) is connected to the hydraulic torque converter (10), the driving sprocket (9) and the oil pump assembly (12) are wrapped between the front cover (8) and the pump housing assembly (3), the front spline of the driving sprocket (9) and the oil pump assembly (12) are connected by a chain (7), and the characteristics are: A power take-off driving gear structure (16) is added to the rear end of the driving sprocket (9); the power take-off driving gear structure (16) of the driving sprocket (9) is transmission-connected to the power take-off; and a needle bearing (6) is radially added between the driving sprocket (9) and the pump housing assembly (3).

2. The automatic transmission with a power take-off structure according to claim 1, characterized in that: A thrust bearing (11) for bearing axial thrust load is added between the driving sprocket (9) shaft and the front end cover (8).

3. The structure for adding a power take-off device to an automatic transmission according to claim 2, characterized in that: A friction-reducing gasket (2) is added between the driving sprocket (9) and the pump housing assembly (3) to reduce friction.

4. The structure for adding a power take-off device to an automatic transmission according to claim 1, characterized in that: A power take-off window is added to each of the left and right sides of the transmission housing (1), so that the power take-off is arranged laterally.

5. The structure for adding a power take-off device to an automatic transmission according to claim 4, characterized in that: The power take-off window is sealed by a power take-off cover plate (15).

6. The structure for adding a power take-off device to an automatic transmission according to claim 5, characterized in that: A sealing gasket (14) is provided between the power take-off cover plate (15) and the power take-off window.

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