Three-shaft power takeoff

Abstract

The utility model discloses a three-shaft type power takeoff which comprises a power takeoff shell, an input shaft, an output flange plate, a shifting fork unit, a power input unit, a transmission unit and a power output unit, the input shaft and the output flange plate extend out of the power takeoff shell, the shifting fork unit, the power input unit, the transmission unit and the power output unit are installed in the power takeoff shell, and the power input unit is meshed with the transmission unit. The transmission unit is meshed with the power output unit; the input shaft is connected with the power input unit through the meshing sleeve, and the shifting fork unit can drive the meshing sleeve to move in the axial direction of the meshing sleeve. The output flange is connected with a power output unit. According to the three-shaft power takeoff provided by the utility model, power is takeoff from the intermediate shaft of the main box of the AMT, and the power of the engine is finally transmitted to various hydraulic pumps at the rear end of the power takeoff through internal power transmission of the power takeoff, so that the functions of tipping, hoisting, pumping and the like of a vehicle are realized. The three-shaft power takeoff provided by the utility model is high in product reliability; the structure is simple, assembling is easy, a plurality of existing parts are used, and the manufacturing period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of transmissions, in particular to a three-axis power take-off. Background Art

[0002] AMT transmissions are gaining popularity in various commercial vehicle models, particularly dump trucks, special-purpose vehicles, and truck cranes. With the increasing emphasis on vehicle lightweighting, transmission design is inevitably being pursued as well. Therefore, a close center-to-center arrangement between the main and auxiliary transmissions has become a mainstream lightweighting strategy. However, OEMs require power take-offs with high output torque, a small overall speed ratio, and a large center-to-center distance between the power take-off and the transmission's main output shaft. Currently available power take-offs cannot meet these requirements. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a three-axis power take-off to solve the problems in the existing technology of the power take-off output torque pin, large output total speed ratio, and small center distance between the power take-off output wheel and the main output shaft of the transmission.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a three-axis power take-off, including a power take-off housing, an input shaft and an output flange, wherein the input shaft and the output flange extend out of the power take-off housing.

[0005] It also includes a fork unit, a power input unit, a transmission unit and a power output unit installed in the power take-off housing. The power input unit is engaged with the transmission unit, and the transmission unit is engaged with the power output unit.

[0006] The input shaft is connected to the power input unit via an engagement sleeve, and the shift fork unit can drive the engagement sleeve to move along its own axial direction.

[0007] The output flange is connected to the power output unit.

[0008] The utility model also has the following technical features:

[0009] The shift fork unit comprises a shift fork shaft passing through the power take-off housing and a shift fork sleeved on the shift fork shaft.

[0010] One end of the shift fork shaft extends out of the power take-off housing, and a pneumatic unit is installed on the end extending out of the power take-off housing. The pneumatic unit can drive the shift fork shaft to move along its own axial direction.

[0011] The shift fork can drive the engagement sleeve to move along its own axial direction.

[0012] The pneumatic unit includes a cylinder body mounted on the power take-off housing and a piston located in the cylinder body. The piston is sleeved on the end of the fork shaft. A return spring is also installed between the piston and the power take-off housing.

[0013] The shift fork shaft and the shift fork are fixed by an elastic cylindrical pin.

[0014] The cylinder body is also provided with an air inlet, which is connected to the air supply unit.

[0015] The power input unit comprises an input gear shaft passing through the power take-off housing and an input gear sleeved on the input gear shaft, and the input gear is meshed with the transmission unit.

[0016] One end of the input shaft is sleeved with one end of the input gear shaft, and the input shaft and the input gear shaft can rotate relative to each other.

[0017] The engagement sleeve is sleeved on the input gear shaft, and the engagement sleeve can drive the input shaft and the input gear shaft to rotate synchronously.

[0018] A cylindrical roller bearing is installed between the input gear shaft and the power take-off housing.

[0019] One end of the input shaft sleeved with the input gear shaft is provided with a needle bearing.

[0020] The transmission unit comprises an intermediate gear shaft passing through the power take-off housing and an intermediate gear sleeved on the intermediate gear shaft. The intermediate gear is respectively engaged with the input gear and the power output unit.

[0021] A cylindrical roller bearing is installed between the intermediate gear shaft and the power take-off housing.

[0022] The power output unit comprises an output gear shaft passing through the power take-off housing and an output gear sleeved on the output gear shaft, and the output gear is meshed with an intermediate gear.

[0023] A cylindrical roller bearing is installed between the output gear shaft and the power take-off housing.

[0024] The output flange is connected to the output gear shaft, and an oil seal is installed between the outer side surface of one end of the output flange connected to the output gear shaft and the power take-off housing.

[0025] The shift fork unit further comprises an indicator light mounted on the power take-off housing, one end of the indicator light extends into the interior of the power take-off housing, and the indicator light can indicate the relative position of the shift fork shaft.

[0026] The power take-off housing is also provided with an oil filling plug and an oil drain plug.

[0027] Compared with the prior art, the present invention has the following technical effects:

[0028] (I) The three-axis power take-off provided by the present invention takes power from the intermediate shaft of the AMT transmission main box, and transmits the engine power to various types of hydraulic pumps at the rear end of the power take-off through the internal power transmission of the power take-off, so that the vehicle can realize functions such as dumping, lifting, and pumping.

[0029] (II) The three-axis power take-off provided by the present invention has high product reliability, simple structure, and is easy to assemble. It utilizes multiple existing parts, shortens the manufacturing cycle, and improves the competitiveness of our company's AMT. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of the three-axis power take-off of the present utility model.

[0031] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure in the UU direction.

[0032] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure in the middle WW direction.

[0033] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure in the ZZ direction.

[0034] The meaning of each reference numeral in the accompanying drawings:

[0035] 1-Power take-off housing, 2-Input shaft, 3-Output flange, 4-Shift fork unit, 5-Power input unit, 6-Transmission unit, 7-Power output unit, 8-Engaging sleeve, 9-Cylindrical roller bearing, 10-Needle roller bearing, 11-Oil seal, 12-Oil filling plug, 13-Oil drain plug, 14-Plastic plug.

[0036] 4-1-Shift fork shaft, 4-2-Shift fork, 4-3-Pneumatic unit, 4-4-Elastic cylindrical pin, 4-5-Indicator light.

[0037] 5-1-Input gear shaft, 5-2-Input gear.

[0038] 6-1-intermediate gear shaft, 6-2-intermediate gear.

[0039] 7-1-output gear shaft, 7-2-output gear.

[0040] 4-3-1 - Cylinder block, 4-3-2 - Piston, 4-3-3 - Return spring.

[0041] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0042] Unless otherwise specified, all components in the present invention are components known in the prior art.

[0043] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the scope of protection of the present invention.

[0044] Example 1:

[0045] This embodiment provides a three-axis power take-off, such as Figure 1-Figure 4 As shown, it includes a power take-off housing 1, an input shaft 2 and an output flange 3, the input shaft 2 and the output flange 3 extending out of the power take-off housing 1, and also includes a fork unit 4, a power input unit 5, a transmission unit 6 and a power output unit 7 installed in the power take-off housing 1, the power input unit 5 is engaged with the transmission unit 6, and the transmission unit 6 is engaged with the power output unit 7.

[0046] The input shaft 2 is connected to the power input unit 5 via the engagement sleeve 8, and the shift fork unit 4 can drive the engagement sleeve 8 to move along its own axial direction.

[0047] The output flange 3 is connected to the power output unit 7 .

[0048] When the customer has requirements such as tipping, lifting, and pumping, the fork unit 4 drives the engaging sleeve 8 to move along its own axial direction, so that the engaging sleeve 8 engages with the right external spline of the input shaft 2 and the left external spline of the input gear shaft 5-1 of the power input unit 5 at the same time. At this time, the input shaft 2 will transmit the power transmitted by the engine to the transmission intermediate shaft to the engaging sleeve 8, and then the engaging sleeve 8 will transmit the power to the power input unit 5, and then to the transmission unit 6, and then to the power output unit 7, and then to the output flange 3, and finally through the output flange 3 to transmit the power to the drive shaft and the rear-end power system.

[0049] like Figure 1 As shown, 15- hexagon head bolt and flat washer assembly (M12x40), 16- hexagon head bolt and flat washer assembly (M12x130), 17- hexagon head bolt and flat washer assembly (M12x55), 18- hexagon head bolt and flat washer assembly (M12x120), 19- hexagon head bolt and flat washer assembly (M12x35), 20- hexagon head bolt and flat washer assembly (M12x90), 21- hexagon socket head screw and flat washer.

[0050] As a preferred embodiment of this invention:

[0051] like Figure 2As shown, the fork unit 4 includes a fork shaft 4 - 1 passing through the power take-off housing 1 and a fork 4 - 2 sleeved on the fork shaft 4 - 1 .

[0052] One end of the fork shaft 4-1 extends out of the power take-off housing 1, and a pneumatic unit 4-3 is also installed on the end extending out of the power take-off housing 1. The pneumatic unit 4-3 can drive the fork shaft 4-1 to move along its own axial direction.

[0053] The shift fork 4 - 2 can drive the engagement sleeve 8 to move along its own axial direction.

[0054] The pneumatic unit 4-3 includes a cylinder body 4-3-1 installed on the power take-off housing 1 and a piston located in the cylinder body 4-3-1. The piston 4-3-2 is sleeved on the end of the fork shaft 4-1. A return spring 4-3-3 is also installed between the piston 4-3-2 and the power take-off housing 1.

[0055] The fork shaft 4-1 and the fork 4-2 are fixed by an elastic cylindrical pin 4-4.

[0056] The cylinder body 4-3-1 is also provided with an air inlet, which is connected to the air supply unit.

[0057] When not in use, the air inlet is blocked with a plastic plug 13.

[0058] When the customer has needs such as tipping, lifting, and pumping, the customer controls the air supply unit to allow gas to enter the cylinder body 4-3-1. The gas pushes the piston 4-3-2 to move to the left, and the piston 4-3-2 drives the shift fork shaft 4-1 to move to the left. The shift fork 4-2 is fixed to the shift fork shaft 4-1 by the elastic cylindrical pin 4-4. The shift fork 4-2 moves to the left synchronously, thereby driving the meshing sleeve 8 to move to the left, so that the meshing sleeve 8 is engaged with the right side external spline of the input shaft 2 and the left side external spline of the input gear shaft 5-1 at the same time. At this time, the input shaft 2 will transmit the power transmitted from the engine to the transmission intermediate shaft to the meshing sleeve 8. At this time, the power is transmitted from the input shaft 2 to the power input unit 5.

[0059] As a preferred embodiment of this invention:

[0060] like Figure 3 As shown, the power input unit 5 includes an input gear shaft 5 - 1 passing through the power take-off housing 1 and an input gear 5 - 2 sleeved on the input gear shaft 5 - 1 , and the input gear 5 - 2 is engaged with the transmission unit 6 .

[0061] One end of the input shaft 2 is sleeved with one end of the input gear shaft 5 - 1 , and the input shaft 2 and the input gear shaft 5 - 1 can rotate relative to each other.

[0062] The engagement sleeve 8 is sleeved on the input gear shaft 5 - 1 , and the engagement sleeve 8 can drive the input shaft 2 and the input gear shaft 5 - 1 to rotate synchronously.

[0063] A cylindrical roller bearing 9 is installed between the input gear shaft 5-1 and the power take-off housing 1, and a needle roller bearing 10 is installed at one end of the input shaft 2 that is sleeved with the input gear shaft 5-1.

[0064] As a preferred embodiment of this invention:

[0065] like Figure 4 As shown, the transmission unit 6 includes an intermediate gear shaft 6-1 passing through the power take-off housing 1 and an intermediate gear 6-2 sleeved on the intermediate gear shaft 6-1. The intermediate gear 6-2 is respectively engaged with the input gear 5-2 and the power output unit 7.

[0066] A cylindrical roller bearing 9 is installed between the intermediate gear shaft 6 - 1 and the power take-off housing 1 .

[0067] As a preferred embodiment of this invention:

[0068] like Figure 4 As shown, the power output unit 7 includes an output gear shaft 7-1 passing through the power take-off housing 1 and an output gear 7-2 sleeved on the output gear shaft 7-1, and the output gear 7-2 is meshed with the intermediate gear 6-2.

[0069] A cylindrical roller bearing 9 is installed between the output gear shaft 7 - 1 and the power take-off housing 1 .

[0070] The output flange 3 is connected to the output gear shaft 7 - 1 , and an oil seal 11 is installed between the outer side surface of one end of the output flange 3 connected to the output gear shaft 7 - 1 and the power take-off housing 1 .

[0071] As a preferred embodiment of this invention:

[0072] like Figure 2 As shown, the fork unit 4 also includes an indicator light 4-5 installed on the power take-off housing 1, one end of the indicator light 4-5 extends into the interior of the power take-off housing 1, and the indicator light 4-5 can indicate the relative position of the fork shaft 4-1.

[0073] like Figure 3 As shown, when the shift fork shaft 4-1 moves to the left, the shift fork shaft 4-1 contacts the bottom of the indicator light 4-5, and the indicator light 4-5 lights up. When the shift fork shaft 4-1 moves to the right, the shift fork shaft 4-1 loses contact with the bottom of the indicator light 4-5, and the indicator light 4-5 goes out.

[0074] The power take-off housing 1 is further provided with an oil filling plug 12 and an oil drain plug 13 .

[0075] The specific usage of this embodiment is as follows:

[0076] Currently, our company's 9-speed integrated AMT transmission lacks a compatible rear power take-off (PTO). While addressing this gap, we thoroughly researched the needs of OEMs and learned that they require a PTO with high output torque, a small overall speed ratio, and ample driveshaft flange mounting space. To address this, this utility model, tailored to both market demand and the needs of the short-center-distance 9-speed AMT, has invented a three-axis PTO structure. This PTO draws power from the intermediate shaft of the AMT transmission's main case. Through the PTO's internal power transmission, engine power is ultimately transmitted to various hydraulic pumps at the rear of the PTO, enabling vehicle functions such as tipping, lifting, and pumping.

[0077] The through-shaft type means that the power take-off input shaft directly obtains power from the intermediate shaft of the transmission main box. Traditional power take-offs generally obtain power from the side or bottom of the transmission main box or from the intermediate shaft of the auxiliary box; the three-shaft type, that is, the input shaft, input gear shaft, intermediate gear shaft, and output gear shaft. Compared with the traditional three-shaft and two-shaft types, the position of the intermediate shaft gear can be adjusted according to actual conditions, thereby changing the center distance between the power take-off output shaft and the transmission main output shaft.

[0078] The utility model designs a Figure 1-Figure 4 For the three-axis PTO structure shown in the figure, after the OEM installs the transmission and PTO on the vehicle frame, they remove the plastic plug 13 and insert the appropriate air pipe connector and air pipe into the air hole at the cylinder block 4-3-1. When the customer has needs such as tipping, lifting, and pumping, they control the air path so that the gas enters the cylinder block 4-3-1. Figure 2 The gas pushes piston 4-3-2 to the left, which in turn drives shift fork shaft 4-1 to the left. Shift fork 4-2 is fixed to shift fork shaft 4-1 via elastic cylindrical pin 4-4. Shift fork 4-2 moves synchronously to the left, which in turn drives engagement sleeve 8 to the left, causing engagement sleeve 8 to simultaneously engage with the right external spline of input shaft 2 and the left external spline of input gear shaft 5-1. At this point, input shaft 2 transmits the power transmitted by the engine to the transmission intermediate shaft to engagement sleeve 8. Engagement sleeve 8 then transmits the power to input gear shaft 5-1, then to intermediate gear shaft 6-1, and finally to output gear shaft 7-1. The power is then transmitted to output flange 3 via output gear 7-2 on output gear shaft 7-1. Finally, the power is transmitted to the transmission shaft and the rear-end power system via output flange 3.

[0079] When the user no longer needs the power take-off, the air supply to cylinder block 4-3-1 is cut off, and the air in the right portion of cylinder block 4-3-1 is naturally exhausted through a control valve, maintaining ventilation to atmospheric pressure. Since there is no high-pressure pressure in the right portion of cylinder block 4-3-1, the left side 4-3-3 pushes piston 4-3-2 to the right, which in turn drives the shift fork shaft 4-1 to the right. This, in turn, drives the shift fork 4-2 and engagement sleeve 8 to the right, causing engagement sleeve 8 to no longer engage with the right external spline of input shaft 2 and instead engage with the left external spline of input gear shaft 5-1. Because the end of input shaft 2 that connects to input gear shaft 5-1 is fitted with a needle bearing 10, power from input shaft 2 is ultimately unable to be transmitted to input gear shaft 5-1. At this point, power is interrupted.

[0080] In addition, other features of this embodiment are as follows: the oil seal 11 of this embodiment plays a sealing role, and the oil seal 11 adopts a bidirectional oil seal, so this embodiment can output in both directions.

[0081] Since the direct interface with the transmission in this embodiment is arranged on the upper left, it is necessary to add oil to the power take-off separately to ensure that the internal components of the power take-off can be fully lubricated and cooled.

[0082] In order to fully lubricate the gear shaft and each cylindrical roller bearing, a refueling plug 12 is reserved at the top of the power take-off. A certain amount of lubricating oil can be directly injected from the refueling plug 12 and stored in the power take-off housing 1.

[0083] The surfaces of the piston 4-3-2 and the cylinder body 4-3-1 where they meet are also provided with O-rings to seal the gas.

[0084] Beneficial effects: High product reliability; simple structure, easy assembly, using multiple existing parts, shortening the manufacturing cycle; improving our company's AMT competitiveness.

[0085] The above technical solutions are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of by any technician familiar with the field within the technical scope disclosed by the present invention without creative work are all covered by the protection scope of the present invention.

Claims

1. A three-axis power take-off, comprising a power take-off housing (1), an input shaft (2) and an output flange (3), wherein the input shaft (2) and the output flange (3) extend out of the power take-off housing (1), and characterized in that: It also includes a shift fork unit (4), a power input unit (5), a transmission unit (6) and a power output unit (7) installed in the power take-off housing (1), wherein the power input unit (5) is engaged with the transmission unit (6), and the transmission unit (6) is engaged with the power output unit (7); The input shaft (2) is connected to the power input unit (5) via the engagement sleeve (8), and the shift fork unit (4) can drive the engagement sleeve (8) to move along its own axial direction; The output flange (3) is connected to the power output unit (7).

2. The three-axis power take-off according to claim 1, characterized in that: The shift fork unit (4) comprises a shift fork shaft (4-1) passing through the power take-off housing (1) and a shift fork (4-2) sleeved on the shift fork shaft (4-1); One end of the shift fork shaft (4-1) extends out of the power take-off housing (1), and a pneumatic unit (4-3) is also installed on the end extending out of the power take-off housing (1). The pneumatic unit (4-3) can drive the shift fork shaft (4-1) to move along its own axial direction; The shift fork (4-2) can drive the engagement sleeve (8) to move along its own axial direction.

3. The three-axis power take-off according to claim 2, characterized in that: The pneumatic unit (4-3) comprises a cylinder body (4-3-1) mounted on a power take-off housing (1) and a piston (4-3-2) located in the cylinder body (4-3-1); the piston (4-3-2) is sleeved on the end of the shift fork shaft (4-1); and a return spring (4-3-3) is installed between the piston (4-3-2) and the power take-off housing (1); The shift fork shaft (4-1) and the shift fork (4-2) are fixed via an elastic cylindrical pin (4-4); The cylinder body (4-3-1) is also provided with an air inlet, which is connected to the air supply unit.

4. The three-axis power take-off according to claim 2, characterized in that: The power input unit (5) comprises an input gear shaft (5-1) passing through the power take-off housing (1) and an input gear (5-2) sleeved on the input gear shaft (5-1), wherein the input gear (5-2) meshes with the transmission unit (6); One end of the input shaft (2) is sleeved with one end of the input gear shaft (5-1), and the input shaft (2) and the input gear shaft (5-1) are capable of relative rotation; The engagement sleeve (8) is sleeved on the input gear shaft (5-1), and the engagement sleeve (8) can drive the input shaft (2) and the input gear shaft (5-1) to rotate synchronously.

5. The three-axis power take-off according to claim 4, characterized in that: A cylindrical roller bearing (9) is installed between the input gear shaft (5-1) and the power take-off housing (1), and a needle roller bearing (10) is installed at one end of the input shaft (2) sleeved with the input gear shaft (5-1).

6. The three-axis power take-off according to claim 4, characterized in that: The transmission unit (6) comprises an intermediate gear shaft (6-1) passing through the power take-off housing (1) and an intermediate gear (6-2) sleeved on the intermediate gear shaft (6-1), wherein the intermediate gear (6-2) is respectively engaged with the input gear (5-2) and the power take-off unit (7); A cylindrical roller bearing (9) is installed between the intermediate gear shaft (6-1) and the power take-off housing (1).

7. The three-axis power take-off according to claim 6, characterized in that: The power output unit (7) comprises an output gear shaft (7-1) passing through the power take-off housing (1) and an output gear (7-2) sleeved on the output gear shaft (7-1), wherein the output gear (7-2) meshes with the intermediate gear (6-2); A cylindrical roller bearing (9) is installed between the output gear shaft (7-1) and the power take-off housing (1); The output flange (3) is connected to the output gear shaft (7-1), and an oil seal (11) is installed between the outer side surface of one end of the output flange (3) connected to the output gear shaft (7-1) and the power take-off housing (1).

8. The three-axis power take-off according to claim 2, characterized in that: The shift fork unit (4) further comprises an indicator light (4-5) mounted on the power take-off housing (1), one end of the indicator light (4-5) extending into the interior of the power take-off housing (1), and the indicator light (4-5) can indicate the relative position of the shift fork shaft (4-1).

9. The three-axis power take-off according to claim 2, characterized in that: The power take-off housing (1) is also provided with an oil filling plug (12) and an oil drain plug (13).

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