Power reversing device and tractor

Abstract

The utility model provides a power reversing device and a tractor. Comprising a shell, an input shaft, a driving hub, a first output shaft, a first clutch, a driving gear, a second output shaft, a second clutch, a driving gear ring and a hydraulic pump. The driving hub and the input shaft keep rotating synchronously, the first output shaft and the driving gear are both arranged on the input shaft in an empty sleeving mode, the second output shaft is parallel to the first output shaft and meshed with the driving gear through the driven gear, the first clutch is arranged between the driving hub and the first output shaft, and the second clutch is arranged between the driving hub and the driving gear. And the driving gear ring sleeves the driving hub and is in transmission connection with the hydraulic pump. According to the utility model, the transmission direction is changed by adopting the wet clutch, so that the whole reversing operation is more convenient and smoother. And meanwhile, the structural characteristics of the power reversing device are fully utilized, the driving gear ring is integrated on the driving hub of the wet clutch, power take-off of the hydraulic pump is achieved, and the structure of the whole hydraulic power take-off device is simplified.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery transmission technology, and in particular to a power reversing device and a tractor. Background Technology

[0002] In related technologies, on the one hand, the power output of a tractor engine mainly relies on conventional mechanical transmissions such as gears, synchronizers, or meshing sleeves. Mechanical structures such as lever-controlled shift forks control the engagement of gears to change the transmission direction. However, this type of mechanical reversing device is cumbersome to use and requires a high level of hand-foot coordination from the driver. On the other hand, the hydraulic pump power take-off (PTO) of a tractor is generally located on the engine or chassis, and power is output through a pump PTO gear on the drive shaft. However, the compact internal space of the engine and chassis not only increases the installation difficulty of the hydraulic pump PTO but also makes the maintenance and inspection of the hydraulic pump more difficult. Therefore, it is necessary to provide a power reversing device to overcome the aforementioned shortcomings. Utility Model Content

[0003] The purpose of this invention is to provide a power reversing device and a tractor.

[0004] According to one aspect of the present invention, a power reversing device is provided, the power reversing device being disposed between an engine and a transmission, the power reversing device comprising: a housing; an input shaft disposed within the housing and drivenly connected to the engine; a drive hub disposed on the input shaft and rotating synchronously with the input shaft; a first output shaft loosely fitted onto the input shaft; a first clutch disposed between the drive hub and the first output shaft, such that the input shaft selectively connects to the first output shaft; a drive gear loosely fitted onto the input shaft; a second output shaft disposed within the housing and parallel to the first output shaft, the second output shaft having a driven gear meshing with the drive gear; a second clutch disposed between the drive hub and the drive gear, such that the input shaft selectively connects to the second output shaft; a drive gear ring fitted onto the drive hub and rotating synchronously with the drive hub; and a hydraulic pump disposed adjacent to the housing, the drive gear ring being drivenly connected to the hydraulic pump.

[0005] Preferably, the housing includes a front end face near the engine and a rear end face near the gearbox. The input shaft is connected to the front end face via a first bearing, the input shaft extends to the rear end face and is connected to the first output shaft, and the first output shaft is connected to the rear end face via a second bearing.

[0006] Preferably, a needle roller bearing is provided between the circumferential connecting surfaces of the input shaft and the first output shaft, and a thrust bearing is provided between the end face connecting surfaces of the input shaft and the first output shaft.

[0007] Preferably, the input shaft and the middle position of the drive hub are connected by a connecting part and rotate synchronously, and the drive gear ring is sleeved on the outer ring of the connecting part.

[0008] Preferably, the input shaft has a first oil passage and a second oil passage, the first oil passage being connected to the working cylinder chamber of the first clutch, and the second oil passage being connected to the working cylinder chamber of the second clutch.

[0009] Preferably, the first oil passage, the second oil passage, and the hydraulic pump are connected by pipelines, and the hydraulic pump provides hydraulic oil to the first oil passage and the second oil passage.

[0010] Preferably, a third oil passage is provided on the input shaft, and the input shaft is connected to the drive gear through a third bearing and a fourth bearing. The third oil passage is connected to the third bearing, the fourth bearing, the piston of the first clutch, and the piston of the second clutch.

[0011] Preferably, the input shaft has a first spline at the end near the engine, a second spline at the end near the gearbox, a third spline on the first output shaft, and a fourth spline on the second output shaft. The first spline is connected to the engine's drive shaft, and the second, third, and fourth splines are connected to the gearbox's drive shaft.

[0012] Preferably, an oil passage is provided below the rear end face, so that the housing is connected to the inner cavity of the gearbox.

[0013] According to another aspect of the present invention, a tractor is provided, including the aforementioned power reversing device.

[0014] Compared with existing technologies, the power reversing device and tractor provided by this utility model have the following advantages: This utility model uses a wet clutch to change the transmission direction, making the overall reversing operation easier and smoother. At the same time, it fully utilizes the structural characteristics of the power reversing device, integrating the drive gear ring onto the drive hub of the wet clutch to achieve power take-off from the hydraulic pump, simplifying the entire hydraulic power take-off device structure and reducing the overall failure rate of the tractor. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 This is a schematic diagram of the commutation device in this utility model;

[0017] Figure 2 This is a cross-sectional schematic diagram of the commutation device in this utility model;

[0018] Figure 3 This is one of the cross-sectional schematic diagrams of the commutation device (without housing) in this utility model;

[0019] Figure 4 This is a partially enlarged view of the first clutch in this utility model;

[0020] Figure 5 This is the second cross-sectional schematic diagram of the commutation device (without housing) in this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Front end face; 12. Rear end face; 121. Oil passage hole;

[0022] 2. Input shaft; 21. Drive hub; 211. Drive gear ring; 212. Connecting part; 22. First bearing; 23. First oil passage; 24. Second oil passage; 25. Third oil passage; 26. First spline; 27. Second spline;

[0023] 4. First output shaft; 41. First driven hub; 42. Second bearing; 43. Needle roller bearing; 44. Thrust bearing; 45. Third spline;

[0024] 5. Driving gear; 51. Second driven hub; 52. Third bearing; 53. Fourth bearing;

[0025] 6. Second output shaft; 61. Driven gear; 62. Fourth spline;

[0026] 7. First clutch; 71. Friction plate assembly; 72. Piston; 73. Elastic element; 74. Limiting plate; 75. Baffle;

[0027] 8. Second clutch. Detailed Implementation

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0030] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0031] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0034] See appendix Figures 1 to 5 This embodiment discloses a power reversing device, mainly applied to agricultural machinery such as tractors. The power reversing device is located between the engine and the gearbox, transmitting the engine's power to the gearbox and controlling the tractor's forward and reverse movement. The power reversing device includes: a housing 1, an input shaft 2, a first output shaft 4, a drive gear 5, a second output shaft 6, a first clutch 7, a second clutch 8, a drive gear ring 211, and a hydraulic pump (not shown in the figure).

[0035] See appendix Figure 1 , 2The housing 1 includes a front end face 11 and a rear end face 12. The front end face 11 is located on the side closer to the engine, and the rear end face 12 is located on the side closer to the gearbox. The input shaft 2 is installed inside the housing 1. One end of the input shaft 2 passes through the front end face 11 and is connected to the engine via the first spline 26.

[0036] See appendix Figure 2 , 3 The input shaft 2 is equipped with a drive hub 21. The input shaft 2 and the drive hub 21 are connected at their midpoints by a connecting part 212 and rotate synchronously. The drive gear ring 211 is fitted onto the outer ring of the connecting part 212 and rotates synchronously with the drive hub 21. The hydraulic pump is arranged adjacent to the housing 1, and the drive gear ring 211 is connected to the hydraulic pump for transmission.

[0037] The other end of the input shaft 2 extends to the rear end face 12 and connects to the first output shaft 4. The first output shaft 4 is loosely fitted onto the input shaft 2 and is coaxially arranged with the input shaft 2. The first output shaft 4 is provided with a first driven hub 41 that rotates synchronously with the first output shaft 4. Specifically, a needle roller bearing 43 is provided between the circumferential connecting surfaces of the input shaft 2 and the first output shaft 4, and a thrust bearing 44 is provided between the end face connecting surfaces of the input shaft 2 and the first output shaft 4.

[0038] The input shaft 2 and the first output shaft 4 pass through the rear end face 12. The first output shaft 4 is connected to the rear end face 12 via a second bearing 42. The first bearing 22 and the second bearing 42 are used to install and fix the input shaft 2 and the first output shaft 4. A second spline 27 is provided on the other end of the input shaft 2. The second spline 27 is an internal spline and is connected to the PTO shaft in the gearbox. A third spline 45 is provided on the first output shaft 4. The third spline 45 is an external spline and is connected to the drive shaft of the gearbox.

[0039] The first clutch 7 is disposed between the driving hub 21 and the first driven hub 41, allowing the input shaft 2 to selectively connect with the first output shaft 4. The first clutch 7 includes a friction plate assembly 71 disposed between the driving hub 21 and the first driven hub 41. When the friction plate assembly 71 is engaged, the power of the driving hub 21 is transmitted to the first driven hub 41 through the friction plate assembly 71. When the friction plate assembly 71 is disengaged, the transmission connection between the driving hub 21 and the first driven hub 41 is broken.

[0040] See appendix Figures 3 to 5A baffle 75 is provided on the side of the drive hub 21 away from the connecting part 212. A piston 72 is provided on the side of the first driven hub 41 near the connecting part 212. The piston 72, the input shaft 2, the connecting part 212, and the drive hub 21 form a working cylinder chamber. A first oil passage 23 is provided on the input shaft 2, and the first oil passage 23 is connected to the working cylinder chamber of the first clutch 7. A friction plate assembly 71 is disposed between the baffle 75 and the piston 72. The friction plate assembly 71 includes a friction plate and a driven disc. The friction plate is fixed to the drive hub 21, and the driven disc is fixed to the first driven hub 41.

[0041] A limiting plate 74 is provided on the input shaft 2 at a predetermined distance from the piston 72. An elastic element 73 is provided between the limiting plate 74 and the piston 72, so that the piston 72 is disengaged from the friction plate assembly 71. When hydraulic oil enters the working cylinder chamber along the first oil passage 23, it pushes the piston 72 to overcome the elastic force of the elastic element 73, so that the piston 72 moves towards the baffle 75 to press the friction plate and the driven plate. The power of the driving hub 21 is transmitted to the first driven hub 41.

[0042] The driving gear 5 is loosely fitted on the input shaft 2 and is coaxially arranged with the input shaft 2. The input shaft 2 and the driving gear 5 are connected by a third bearing 52 and a fourth bearing 53. The driving gear 5 is provided with a second driven hub 51 to keep the driving gear 5 rotating synchronously. The second output shaft 6 is installed parallel to the input shaft 2 in the housing 1. The second output shaft 6 is provided with a driven gear 61 that meshes with the driving gear 5.

[0043] The second clutch 8 is disposed between the driving hub 21 and the second driven hub 51, allowing the input shaft 2 to selectively connect with the second output shaft 6. The structure of the second clutch 8 is the same as that of the first clutch 7. The second clutch 8 includes a friction plate assembly 71 disposed between the driving hub 21 and the second driven hub 51. When the friction plate assembly 71 is engaged, the power of the driving hub 21 is transmitted to the second driven hub 51 through the friction plate assembly 71. When the friction plate assembly 71 is disengaged, the transmission connection between the driving hub 21 and the second driven hub 51 is broken.

[0044] Similarly, a second oil passage 24 is provided on the input shaft 2, which is connected to the working cylinder chamber of the second clutch 8. When hydraulic oil enters the working cylinder chamber along the second oil passage 24, the piston 72 moves toward the baffle 75 to press against the friction plate and the driven plate, and the power of the driving hub 21 is transmitted to the second driven hub 51.

[0045] The second output shaft 6 is provided with a fourth spline 62, which is an external spline, and is connected to the transmission shaft of the gearbox. The first output shaft 4 and the second output shaft 6 are guided to the transmission shaft in opposite directions of rotation. When the first clutch 7 is engaged, the second clutch 8 is disengaged, enabling the tractor to move forward. When the second clutch 8 is engaged, the first clutch 7 is disengaged, enabling the tractor to move forward.

[0046] In addition, a third oil passage 25 (not shown in the figure) is provided on the input shaft 2. The third oil passage 25 is connected to the third bearing 52, the fourth bearing 53, the piston 72 of the first clutch 7 and the piston 72 of the second clutch 8, so as to realize the lubrication of the third bearing 52, the fourth bearing 53, the first clutch 7 and the second clutch 8.

[0047] Meanwhile, an oil passage hole 121 is provided below the rear end face 12, so that the housing 1 is connected to the inner cavity of the gearbox. Connecting the housing 1 to the inner cavity of the gearbox allows the drive gear 5, driven gear 61, first clutch 7 and second clutch 8 to be immersed in hydraulic oil, thereby achieving lubrication and heat dissipation of the reversing device.

[0048] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A power reversing device, characterized in that, The power reversing device is located between the engine and the transmission, and the power reversing device includes: case; An input shaft, which is disposed within the housing and is connected to the engine drive; An active hub is mounted on the input shaft and rotates synchronously with the input shaft. A first output shaft is loosely fitted onto the input shaft; A first clutch is disposed between the drive hub and the first output shaft, such that the input shaft is selectively connected to the first output shaft; A drive gear, which is loosely fitted onto the input shaft; A second output shaft is disposed inside the housing and parallel to the first output shaft, and a driven gear that meshes with the driving gear is provided on the second output shaft; A second clutch is disposed between the drive hub and the drive gear, such that the input shaft is selectively connected to the second output shaft; A drive gear ring, which is sleeved on the drive hub and rotates synchronously with the drive hub; A hydraulic pump is disposed adjacent to the housing, and the drive gear ring is connected to the hydraulic pump for transmission.

2. The power reversing device as described in claim 1, characterized in that, The housing includes a front end face near the engine and a rear end face near the gearbox. The input shaft is connected to the front end face via a first bearing. The input shaft extends to the rear end face and is connected to the first output shaft. The first output shaft is connected to the rear end face via a second bearing.

3. The power reversing device as described in claim 2, characterized in that, A needle roller bearing is provided between the circumferential connecting surfaces of the input shaft and the first output shaft, and a thrust bearing is provided between the end face connecting surfaces of the input shaft and the first output shaft.

4. The power reversing device as described in claim 3, characterized in that, The input shaft and the middle position of the drive hub are connected by a connecting part and rotate synchronously, and the drive gear ring is sleeved on the outer ring of the connecting part.

5. The power reversing device as described in claim 4, characterized in that, The input shaft is provided with a first oil passage and a second oil passage. The first oil passage is connected to the working cylinder chamber of the first clutch, and the second oil passage is connected to the working cylinder chamber of the second clutch.

6. The power reversing device as described in claim 5, characterized in that, The first oil passage and the second oil passage are connected to the hydraulic pump via pipelines, and the hydraulic pump provides hydraulic oil to the first oil passage and the second oil passage.

7. The power reversing device as described in claim 6, characterized in that, The input shaft is provided with a third oil passage. The input shaft is connected to the drive gear through a third bearing and a fourth bearing. The third oil passage is connected to the third bearing, the fourth bearing, the piston of the first clutch, and the piston of the second clutch.

8. The power reversing device as described in claim 7, characterized in that, The input shaft has a first spline at the end near the engine and a second spline at the end near the gearbox. The first output shaft has a third spline and the second output shaft has a fourth spline. The first spline is connected to the engine's drive shaft, and the second, third, and fourth splines are connected to the gearbox's drive shaft.

9. The power reversing device as described in claim 8, characterized in that, An oil passage is provided below the rear end face, so that the housing is connected to the inner cavity of the gearbox.

10. A tractor, characterized in that, Includes the power reversing device as described in any one of claims 1 to 9.

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