Power take-off with braking function

Abstract

This utility model discloses a power take-off (PTO) with braking function, including a PTO housing, an output shaft and an output gear disposed within the PTO housing, the output gear being sleeved on the output shaft; multiple friction plates are mounted on the outer side of the output gear along its circumference; it also includes a clutch hub sleeved on the output shaft, the rear end of the clutch hub being open and the front end being movably connected to a brake hub; multiple mating plates are mounted on the inner wall of the clutch hub facing the output shaft, the friction plates and mating plates being alternately distributed; a piston is also sleeved on the output shaft between the inner wall of the clutch hub and the mating plates, a first oil chamber is formed between the piston and the clutch hub, and a second oil chamber is formed between the clutch hub and the brake hub; a third oil passage is provided on the clutch hub, capable of connecting the first oil chamber and the second oil chamber; a first oil passage is provided on the output shaft, the first oil passage communicating with the first oil chamber; a first spring capable of extending and retracting along the output shaft axially is provided inside the clutch hub, and a second spring capable of extending and retracting along the output shaft axially is provided inside the brake hub.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, specifically to a power take-off unit with braking function. Background Technology

[0002] Currently, the application of power take-offs (PTOs) in China is mainly in dump trucks. With the diversification of engineering vehicles, the types of loads connected to PTOs are also gradually increasing. When the rotational inertia of the connected load is too large, the PTO often experiences difficulty in pulling away during operation, causing wear on the friction plates and mating plates, thus affecting the service life of the PTO. To address this issue, most modification shops connect an external brake disc to the PTO output end. This design is not only structurally complex but also increases the difficulty of installation, debugging, and maintenance, and urgently needs improvement. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a power take-off with braking function, so as to solve the technical problem that the friction plate and mating plate of the power take-off are worn due to the unsmooth pull-out, thus affecting the service life of the power take-off.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A power take-off (PTO) with braking function includes a PTO housing, an output shaft and an output gear disposed within the PTO housing, the two ends of the output shaft extending out of the PTO housing, and the output gear being sleeved on the output shaft; a plurality of friction plates are mounted on the output gear along its circumferential outer side.

[0006] It also includes a clutch hub sleeved on the output shaft, the rear end of the clutch hub being open and the front end being movably connected to a brake hub; a plurality of mating plates are installed on the inner wall of the clutch hub facing the output shaft, and the friction plates and mating plates are alternately distributed;

[0007] A piston is also fitted on the output shaft. The piston is located between the clutch hub and the mating plate. A first oil chamber is formed between the piston and the clutch hub, and a second oil chamber is formed between the clutch hub and the brake hub. A third oil passage is provided on the clutch hub, which can connect the first oil chamber and the second oil chamber. A first oil passage is provided on the output shaft, and the first oil passage is connected to the first oil chamber.

[0008] The clutch hub is provided with a first spring that can extend and retract along the output shaft axial direction, and the brake hub is provided with a second spring that can extend and retract along the output shaft axial direction.

[0009] This utility model also has the following technical features:

[0010] Specifically, the output shaft is also provided with a second oil passage leading to the friction plate.

[0011] Furthermore, a first baffle is provided at the end of the clutch hub away from the piston. The first baffle is sleeved on the output shaft, and the mating plate is disposed between the first baffle and the piston.

[0012] Furthermore, the two ends of the first spring are respectively connected to the piston and the spring seat sleeved on the output shaft.

[0013] Furthermore, an annular mounting cavity with an open front end is provided on the front end face of the brake drum. The second spring is provided in the mounting cavity. The two ends of the second spring are respectively connected to the bottom plate of the mounting cavity and the second baffle provided at the front end of the brake drum. The second baffle is connected to the clutch drum by bolts.

[0014] Furthermore, the clutch hub has multiple threaded holes on its front end face, the brake hub has multiple first through holes, and the second baffle has multiple second through holes. The threaded holes, first through holes, and second through holes can be coaxially connected, and the bolt passes through the second through holes and the first through holes into the threaded holes.

[0015] Furthermore, a friction ring is provided between the clutch hub and the brake hub, and the friction ring is sleeved on the clutch hub.

[0016] Furthermore, an output flange is fitted onto the axial front end of the output shaft, and the rear end of the output flange extends into the power take-off housing.

[0017] Furthermore, the bolt includes an integrally connected bolt head, a first screw section, and a second screw section. The diameter of the first screw section is larger than the diameter of the second screw section, and the diameter of the first screw section is 2-4 mm smaller than the diameter of the first through hole.

[0018] Compared with the prior art, this utility model has the following technical effects:

[0019] This utility model has a simple, compact, and reasonable structure and is lightweight. A braking structure is added to the clutch hub of the power take-off to ensure that the power take-off can disengage normally during use, protect the friction plates and mating plates, and improve the service life and stability of the power take-off. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a partial structural diagram of the present invention before hydraulic oil is injected.

[0022] Figure 3 A partial structural diagram of this utility model after hydraulic oil has been injected;

[0023] Figure 4 This is a schematic diagram of a bolt structure;

[0024] Figure 5 This is a schematic diagram of the friction ring structure;

[0025] Figure 6 This is a schematic diagram of the brake hub structure.

[0026] The meanings of the labels in the attached diagram are as follows:

[0027] 1-Power take-off housing, 2-Output shaft, 3-Output gear, 4-Friction plate, 5-Clutch hub, 6-Brake hub, 7-Matching plate, 8-Piston, 9-First oil chamber, 10-Second oil chamber, 11-Third oil passage, 12-First oil passage, 13-First spring, 14-Second spring, 15-Second oil passage, 16-First baffle, 17-Spring seat, 18-Second baffle, 19-Bolt, 20-Friction ring, 21-Output flange; 601-Mounting cavity; 1901-Bolt head, 1902-First screw section, 1903-Second screw section.

[0028] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0029] Unless otherwise specified, all components in this utility model can be purchased from the market.

[0030] The terms "upper," "lower," "front," "rear," "top," and "bottom," etc., used in this utility model to indicate orientation or positional relationships are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "Inner" and "outer" refer to the inner and outer contours of the corresponding components, and the above terms should not be construed as limitations on this utility model. This utility model is based on... Figure 1 The directions are shown.

[0031] Furthermore, the terms "first," "second," and other ordinal numbers are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0032] In this invention, unless otherwise stated, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] 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. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0034] Example 1

[0035] Following the above technical solution, this embodiment provides a power take-off unit with braking function, such as... Figure 1 As shown, it includes a power take-off housing 1, and an output shaft 2 and an output gear 3 disposed inside the power take-off housing 1. Both ends of the output shaft 2 extend out of the power take-off housing 1, and the output gear 3 is sleeved on the output shaft 2 and meshes with the intermediate gear to transmit power; multiple friction plates 4 are installed on the outer side of the output gear 3 along its circumference.

[0036] It also includes a clutch hub 5 fitted on the output shaft 2. The rear end of the clutch hub 5 is open and the front end is movably connected to a brake hub 6. The clutch hub 5 can be axially positioned by the shoulder on the output shaft 2 and can be connected to the output shaft 2 by a spline to transmit power. Multiple mating plates 7 are installed on the inner wall of the clutch hub 5 facing the output shaft 2. The friction plates 4 and the mating plates 7 are alternately distributed and can transmit force through friction.

[0037] A piston 8 is also fitted on the output shaft 2. The piston 8 is located between the clutch hub 5 and the mating plate 7. A first oil chamber 9 is formed between the piston 8 and the clutch hub 5. Specifically, the first oil chamber 9 is formed between the front end face of the piston 8 and the inner wall of the clutch hub 5. A second oil chamber 10 is formed between the clutch hub 5 and the brake hub 6. Specifically, the second oil chamber 10 is formed between the front end face of the clutch hub 5 and the inner wall of the brake hub 6. A third oil passage 11 is provided on the clutch hub 5, which can connect the first oil chamber 9 and the second oil chamber 10. A first oil passage 12 is provided on the output shaft 2, which is connected to the first oil chamber 9. Hydraulic oil can enter the first oil chamber 9 through the first oil passage 12, and then enter the second oil chamber 10 through the third oil passage 11.

[0038] A first spring 13 capable of extending and retracting along the output shaft 2 is installed inside the clutch hub 5, and a second spring 14 capable of extending and retracting along the output shaft 2 is installed inside the brake hub 6. That is, the extension and retraction directions of the first spring 13 and the second spring 14 are arranged along the axial direction of the output shaft 2. The piston 8 can move along the axial direction of the output shaft 2 under the action of oil pressure and spring force, and the brake hub 6 can move along the axial direction of the output shaft 2 under the action of oil pressure and spring force, thus controlling whether the power take-off outputs power.

[0039] As a preferred embodiment, the output shaft 2 is further provided with a second oil passage 15 leading to the friction plate 4. Oil from the control valve can be delivered to the first oil chamber 9 via the first oil passage 12, and oil from the control valve can be delivered to the working chamber within the clutch hub 5 via the second oil passage 15 to control the operation of the power take-off. The lubricating oil delivered via the second oil passage 15 is used to lubricate the friction plate 4 and the mating plate 7, reducing wear.

[0040] As a preferred embodiment, a first baffle 16 is provided at the end of the clutch hub 5 away from the piston 8. The first baffle 16 is sleeved on the output shaft 2, and the mating plate 7 is disposed between the first baffle 16 and the piston 8.

[0041] As a preferred embodiment, the two ends of the first spring 13 are respectively connected to the piston 8 and the spring seat 17 sleeved on the output shaft 2.

[0042] As a preferred embodiment, an annular mounting cavity 601 with an open front end is provided on the front end face of the brake drum 6. A second spring 14 is provided in the mounting cavity 601. The two ends of the second spring 14 are respectively connected to the bottom plate of the mounting cavity 601 and the second baffle 18 provided at the front end of the brake drum 6. The second baffle 18 is connected to the clutch drum 5 by bolts 19, and the brake drum 6 can move axially along the bolts 19.

[0043] As a preferred embodiment, the clutch hub 5 has multiple threaded holes on its front end face, the brake hub 6 has multiple first through holes, and the second baffle 18 has multiple second through holes. The threaded holes, first through holes, and second through holes can be coaxially connected, and the bolt 19 passes through the second through holes and the first through holes into the threaded holes.

[0044] In this embodiment, the first through hole, the second through hole, and the threaded hole have a one-to-one correspondence.

[0045] As a preferred embodiment, a spacer is further provided between the clutch hub 5 and the brake hub 6. Figure 5 The friction ring 20 shown is sleeved on the clutch 5 hub and connected to the power take-off housing 1. It does not rotate during operation. The friction ring 20, brake hub 6, and second baffle 18 are mounted on the clutch hub 5 by bolts 19.

[0046] As a preferred embodiment, the output shaft 2 is fitted with an output flange 21 at its axial front end, and the rear end of the output flange 21 extends into the power take-off housing 1. The output shaft 2 is connected to the flange 21 via a spline for output.

[0047] like Figure 4 As shown, in a preferred embodiment, the bolt 19 includes an integrally connected bolt head 1901, a first screw section 1902, and a second screw section 1903. The diameter of the first screw section 1902 is larger than the diameter of the second screw section 1903, and the diameter of the first screw section 1902 is 2-4 mm smaller than the diameter of the first through hole. The first screw section 1902 passes through the first and second through holes, and the second screw section 1903 extends into the threaded hole. The outer wall of the second screw section 1903 is provided with external threads, and the threaded hole is provided with internal threads that can match the external threads, so that the bolt 19 can be threadedly connected to the clutch hub 5.

[0048] The usage process of this utility model is as follows:

[0049] When the power take-off (PTO) needs to operate normally, hydraulic oil enters the first oil chamber 9 and exerts pressure on the piston 8 and clutch hub 5. This pushes the piston 8 axially backward, compressing the friction plate 4 and mating plate 7, thus connecting the output gear 3 and clutch hub 5 to output power. At this time, the first spring 13 is compressed, and the clutch hub 5 also moves axially forward under pressure until it abuts against the second baffle 18. The brake hub 6 and friction ring 20 are in a floating state, achieving... Figure 3 In the state shown, there is no braking effect. At this time, the second spring 14 is compressed, and the power take-off works normally.

[0050] When the power take-off needs to stop working, the oil circuit is disconnected, and piston 8 returns to its original position under the action of the first spring 13. Figure 2 In the initial position shown, the clutch hub 5 is disconnected from the output gear 3, and there is no power output. At the same time, the second spring 14 pushes the brake hub 6 back to the initial position. The oil in the second oil chamber 10 flows back to the first oil chamber 9 from the third flow channel 11, and then flows back to the power take-off housing 1 from the oil hole on the piston 8. The brake hub 6, friction ring 20, and clutch hub 5 are pressed together, generating a frictional torque that prevents the clutch hub 5 from rotating, thus achieving rapid braking.

[0051] The above technical solutions are only preferred embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art without creative effort within the technical scope disclosed in this utility model are covered within the protection scope of this utility model.

Claims

1. A power take-off (PTO) with braking function, comprising a PTO housing (1), an output shaft (2) and an output gear (3) disposed within the PTO housing (1), wherein both ends of the output shaft (2) extend from the PTO housing (1), and the output gear (3) is sleeved on the output shaft (2); a plurality of friction plates (4) are mounted on the outer side of the output gear (3) circumferentially; further comprising a clutch hub (5) sleeved on the output shaft (2), wherein the rear end of the clutch hub (5) is open and the front end is movably connected to a brake hub (6); a plurality of mating plates (7) are mounted on the inner wall of the clutch hub (5) facing the output shaft (2), and the friction plates (4) and mating plates (7) are alternately distributed, characterized in that, A piston (8) is also fitted on the output shaft (2). The piston (8) is located between the clutch hub (5) and the mating plate (7). A first oil chamber (9) is formed between the piston (8) and the clutch hub (5). A second oil chamber (10) is formed between the clutch hub (5) and the brake hub (6). A third oil passage (11) is provided on the clutch hub (5) to connect the first oil chamber (9) and the second oil chamber (10). A first oil passage (12) is provided on the output shaft (2), and the first oil passage (12) is connected to the first oil chamber (9). The clutch hub (5) is provided with a first spring (13) that can extend and retract along the output shaft (2) axially, and the brake hub (6) is provided with a second spring (14) that can extend and retract along the output shaft (2) axially.

2. The power take-off unit with braking function as described in claim 1, characterized in that, The output shaft (2) is also provided with a second oil passage (15) leading to the friction plate (4).

3. The power take-off unit with braking function as described in claim 1, characterized in that, A first baffle (16) is provided at one end of the clutch hub (5) away from the piston (8). The first baffle (16) is sleeved on the output shaft (2). The mating plate (7) is disposed between the first baffle (16) and the piston (8).

4. The power take-off unit with braking function as described in claim 1, characterized in that, The two ends of the first spring (13) are respectively in contact with the piston (8) and the spring seat (17) sleeved on the output shaft (2).

5. The power take-off unit with braking function as described in claim 1, characterized in that, The brake hub (6) has an open annular mounting cavity (601) on its front end face. The second spring (14) is installed in the mounting cavity (601). The two ends of the second spring (14) are respectively connected to the bottom plate of the mounting cavity (601) and the second baffle (18) located at the front end of the brake hub (6). The second baffle (18) is connected to the clutch hub (5) by bolts (19).

6. The power take-off unit with braking function as described in claim 5, characterized in that, The clutch hub (5) has multiple threaded holes on its front end face, the brake hub (6) has multiple first through holes, and the second baffle (18) has multiple second through holes. The threaded holes, first through holes, and second through holes can be coaxially connected. The bolt (19) passes through the second through hole and the first through hole into the threaded hole.

7. The power take-off unit with braking function as described in claim 1, characterized in that, A friction ring (20) is also provided between the clutch hub (5) and the brake hub (6), and the friction ring (20) is sleeved on the clutch hub (5).

8. The power take-off unit with braking function as described in claim 1, characterized in that, The output shaft (2) has an output flange (21) sleeved at its axial front end, and the rear end of the output flange (21) extends into the power take-off housing (1).

9. The power take-off unit with braking function as described in claim 5, characterized in that, The bolt (19) includes an integrally connected bolt head (1901), a first screw section (1902), and a second screw section (1903). The diameter of the first screw section (1902) is larger than the diameter of the second screw section (1903), and the diameter of the first screw section (1902) is 2-4 mm smaller than the diameter of the first through hole.

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