Independent double-clutch mechanism of tractor

Abstract

The utility model relates to the technical field of tractor power mechanisms, in particular to a transmission mechanism of a tractor clutch. Comprising an engine flywheel, a main transmission shaft and a PTO transmission shaft, the main transmission shaft is connected with a gear shifting mechanism, the PTO transmission shaft is connected with a PTO output mechanism, the front end of the PTO transmission shaft is fixedly connected to the center of the engine flywheel, the main transmission shaft is a hollow shaft, and the PTO transmission shaft is rotatably sleeved with the main transmission shaft. The front end of the main transmission shaft is provided with a clutch driven disc capable of axially moving through a spline, a clutch pressure disc is arranged behind the clutch driven disc, and the edge of the clutch pressure disc is fixedly connected to an engine flywheel through a bolt; the rear end of the PTO transmission shaft is connected with a PTO output mechanism through a wet clutch. The clutch mechanism can respectively control PTO power output and main transmission to a gearbox, and the PTO power output and the main transmission can be accurately controlled. The transmission shaft is high in concentricity and low in failure rate, multiple power transmission modes of independent power output and synchronous power output can be achieved, and meanwhile shaft breakage accidents are reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of tractor power mechanisms, specifically an independent dual-clutch mechanism for tractors. Background Technology

[0002] The function of a tractor clutch is to transmit power from the diesel engine to the gearbox and cut off power output when needed. In other words, the clutch is located between the engine and the gearbox. The clutch's drive shaft can transmit power from the diesel engine to the gearbox in a switching manner, and also to the tractor's power output shaft, ensuring smooth operation of the tractor during starting, driving, and stopping, while providing power output to the suspension system. Traditional tractors with conventional single-acting clutches obtain power from the engine for both driving and output shaft power through a single-plate clutch. When driving, changing gears, turning, or stopping, all power is cut off, including the power source needed by implements. Therefore, in complex working conditions requiring gear changes and turning in the field, implements cannot receive power, leading to missed tillage during field operations and inability to perform stationary tasks. Chinese Patent 201910729293X discloses a "Tractor Power Take-Off Device with Wet Clutch," authorized publication number CN110466348B. This device includes a power input shaft connected to the engine, a power output shaft and a power connecting shaft sequentially sleeved on the power input shaft, a transmission output system connected to the power output shaft, a sliding sleeve slidably sleeved between the power output shaft and the power connecting shaft, a mounting seat for mounting the inner plate on the wet clutch connected to the power input shaft, and a housing for mounting the outer plate on the wet clutch connected to the power output system. The housing is also connected to the PTO power take-off system. The device includes a control system for the operation of the sliding sleeve and the wet clutch. This device can achieve independent power output and synchronous power output. However, this device still requires the sliding sleeve to transmit the PTO power output. The sliding sleeve has a compact structure, is subjected to high force, and has a high failure rate during use. Furthermore, an additional control system is needed to ensure that the tractor can only be started when the PTO power is disconnected, to avoid the danger caused by sudden tractor ignition and starting while the PTO is operating, and to improve driving safety. My other Chinese patent application, 2024229933078, discloses a transmission mechanism for a tractor clutch. This transmission mechanism includes a drive shaft, a first engaging gear, and a second engaging gear mounted on the drive shaft. The front end of the drive shaft is connected to a clutch disc. The front end of the drive shaft has a front spline for connecting to the clutch disc, and the middle section has a first engaging gear spline. The first engaging gear is mounted on the drive shaft via the first engaging gear spline. A gearbox I shaft is rotatably fitted onto the rear end of the drive shaft. The gearbox I shaft is coaxial with the drive shaft. The front end of the gearbox I shaft has a second engaging gear spline. The second engaging gear is rotatably mounted on the front end of the gearbox I shaft via a bearing. An engaging sleeve assembly is mounted on the second engaging gear spline. When the engaging sleeve assembly engages with the second engaging gear, the second engaging gear rotates synchronously with the gearbox I shaft. When the engaging sleeve assembly releases the second engaging gear and engages with the first engaging gear, the gearbox I shaft rotates synchronously with the drive shaft.The clutch drive shafts on both sides of the engagement sleeve assembly of this transmission mechanism are integrated structures with reasonable structure and good concentricity, which can effectively avoid and reduce the occurrence of shaft breakage accidents and reduce the failure rate of the clutch transmission mechanism. Summary of the Invention

[0003] This invention provides an independent dual-clutch mechanism for tractors with a reasonable structure, high concentricity of the drive shaft, and low failure rate to solve the above problems. It realizes multiple power transmission modes, including independent power output and synchronous power output, while reducing the occurrence of shaft breakage accidents.

[0004] The technical solution adopted by this utility model to solve the technical problem is:

[0005] This utility model discloses an independent dual-clutch mechanism for a tractor, comprising an engine flywheel, a main drive shaft, and a PTO drive shaft. The main drive shaft is connected to a shifting mechanism, and the PTO drive shaft is connected to a PTO output mechanism. The front end of the PTO drive shaft is fixedly connected to the center of the engine flywheel. The main drive shaft is a hollow shaft, and the PTO drive shaft is rotatably fitted inside the main drive shaft. An axially movable clutch driven plate is mounted on the front end of the main drive shaft via a spline. A clutch pressure plate is disposed behind the clutch driven plate, and the edge of the clutch pressure plate is fixedly connected to the engine flywheel by bolts. The rear end of the PTO drive shaft is connected to the PTO output mechanism via a wet clutch.

[0006] This solution allows the clutch mechanism to control the PTO power output and the main drive to the gearbox separately, both with precise control. It features high driveshaft concentricity, low failure rate, and supports multiple power transmission modes, including independent and synchronous power output, while also reducing the occurrence of shaft breakage accidents.

[0007] Preferably, a connecting sleeve is installed at the front end of the PTO drive shaft via a spline, the front end of the connecting sleeve is fixedly connected to the engine flywheel, a bearing seat is provided at the rear end of the connecting sleeve, a front bearing is installed in the bearing seat, and the front end of the main drive shaft is installed in the front bearing.

[0008] With this solution, the PTO drive shaft is directly connected to the engine flywheel, while the main drive shaft is connected to the engine flywheel through a clutch device, which facilitates independent power output of the PTO when the vehicle is parked.

[0009] Preferably, the rear end of the PTO drive shaft is fixedly connected to the driving end of the wet clutch, and the driven end of the wet clutch is connected to the PTO output mechanism.

[0010] With this solution, the wet clutch controls the PTO output without being affected by the main drive shaft, enabling precise control.

[0011] Preferably, the PTO output mechanism includes a PTO drive shaft fixedly connected to the driven end of the wet clutch and a PTO driven shaft that is connected to the PTO drive gear through gear meshing.

[0012] This solution allows for the modification of the PTO output speed, making it more suitable for agricultural machinery operations.

[0013] Preferably, a bushing is fitted on the outer side of the main drive shaft, and the bushing is fixedly connected to the first partition in the housing; the main drive shaft extends backward through the first partition and its end is mounted on the second partition through a bearing, and the PTO drive shaft in the inner cavity of the main drive shaft extends through the second partition into the housing behind the second partition.

[0014] This design ensures that the main drive shaft and PTO drive shaft are structurally robust and highly concentric, reducing the likelihood of shaft breakage. The bushing on the main drive shaft serves as a support and housing for the release bearing seat, which is used to mount the clutch release mechanism and is connected to the clutch pedal on the outside of the housing via the transmission mechanism.

[0015] Thanks to the aforementioned structure, this clutch mechanism can separately control the PTO power output and the main drive to the gearbox, both of which can be precisely controlled. The driveshaft has high concentricity and a low failure rate, enabling multiple power transmission modes, including independent and synchronous power output, while also reducing the occurrence of shaft breakage accidents. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of one embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A schematic diagram of the assembly structure of the embodiment. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions away from the geometric center of a specific component.

[0019] like Figure 1 , Figure 2As shown, the independent dual-clutch mechanism of the tractor described in this utility model includes an engine flywheel 1, a main drive shaft 6, and a PTO drive shaft 3. The engine flywheel 1 is directly connected to the engine's power output, providing power to the main drive shaft 6 and the PTO drive shaft 3. The main drive shaft 6 is connected to a shift mechanism, and the output end of the shift mechanism is connected to a travel mechanism to drive the travel wheels. The PTO drive shaft 3 is connected to a PTO output mechanism. PTO stands for auxiliary power output; for tractors, PTO typically refers to the power output used to drive agricultural implements.

[0020] The front end of the PTO drive shaft 3 is fixedly connected to the center of the engine flywheel 1. Figure 1 In this embodiment, a connecting sleeve 2 is splinedly mounted on the front end of the PTO drive shaft 3. The connecting sleeve 2 is an internal splined sleeve with a flange at the front end. The front end of the connecting sleeve 2 is fixedly connected to the engine flywheel 1 via the flange. The front end of the PTO drive shaft 3 has an external spline that adapts to the connecting sleeve 2. The external spline of the front end of the PTO drive shaft 3 is installed into the internal spline of the connecting sleeve 2. Of course, as another embodiment of this utility model, the PTO drive shaft 3 and the engine flywheel 1 can also be fixedly connected by other easily assembled methods. For example, the connecting sleeve 2 and the front end of the PTO drive shaft 3 can be fitted with a polygonal shaft head through a polygonal hole. In addition, a bearing seat is provided at the rear end of the connecting sleeve 2. The bearing seat is coaxially arranged with the connecting sleeve 2 and forms an integrated structure with the connecting sleeve 2. A front bearing 64 is installed in the bearing seat. The outer ring surface of the front bearing 64 is interference-fitted onto the inner wall of the bearing seat. The front end of the main drive shaft 6 is installed in the front bearing 64, and the inner ring surface of the front bearing 64 is interference-fitted onto the main drive shaft 6. In this way, the main drive shaft 6 is rotatably mounted in the bearing seat of the connecting sleeve 2 via the front bearing 64, and the rotation of the main drive shaft 6 is not affected by the connecting sleeve 2, and vice versa.

[0021] The main drive shaft 6 is a hollow shaft, and the PTO drive shaft 3 is rotatably fitted inside the main drive shaft 6. A clutch driven plate 4, which can move axially, is mounted on the front end of the main drive shaft 6 via a spline. A clutch pressure plate 5 is located behind the clutch driven plate 4, and the edge of the clutch pressure plate 5 is bolted to the engine flywheel 1. In use, the clutch driven plate 4 can be axially moved using a clutch operating mechanism (not shown in the attached diagram) to press the clutch driven plate 4 against the clutch pressure plate 5, or to separate the two. The clutch operating mechanism for axially moving the clutch driven plate 4 is existing technology and will not be described in detail here.

[0022] The rear end of the PTO drive shaft 3 is connected to the PTO output mechanism via a wet clutch 7. A wet clutch is an oil-cooled clutch consisting of multiple closely spaced steel plates and friction plates. A hydraulic cylinder presses the steel plates and friction plates together to engage the clutch. Upon oil return, the steel plates and friction plates separate under spring force. The friction plate directly controlled by the hydraulic cylinder is called the driving end, and the friction plate engaged with the driving end to perform the clutch function is called the driven end. The rear end of the PTO drive shaft 3 is fixedly connected to the driving end of the wet clutch 7, and the driven end of the wet clutch 7 is connected to the PTO output mechanism. When the hydraulic mechanism controls the wet clutch 7 to engage, the power of the PTO drive shaft 3 can be transmitted to the PTO output mechanism through the wet clutch 7; conversely, when the wet clutch 7 is disengaged, the PTO drive shaft 3 idles, and the PTO output mechanism does not operate. The structure and working principle of the wet clutch are existing technology and will not be described in detail here.

[0023] like Figure 1 As shown, the PTO output mechanism includes a PTO drive shaft 8 fixedly connected to the driven end of the wet clutch 7, and a PTO driven shaft 9 connected to the PTO drive gear via gear meshing. Thus, a suitable rotational speed of the PTO driven shaft 9 can be obtained by adjusting the gear parameters to meet the needs of agricultural machinery operation.

[0024] A bushing 60 is fitted onto the outer side of the main drive shaft 6, and the bushing 60 is fixedly connected to the first partition 62 in the housing 61. The main drive shaft 6 extends rearward through the first partition 62, and its end is mounted on the second partition 63 via a bearing. The PTO drive shaft 3 inside the main drive shaft 6 extends through the second partition 63 into the housing 61 behind the second partition 63. The first partition 62 and the second partition 63 in the housing 61 provide support for the main drive shaft 6 and the PTO drive shaft 3, preventing them from bending or becoming misaligned due to radial forces. Additionally, the bushing 60 serves as a support and housing for the release bearing in the clutch disengagement mechanism. The release bearing housing is fitted onto the outer side of the main drive shaft, the support is fixed in position, and the release bearing is mounted on it, connected to the clutch pedal on the outside of the housing via a transmission mechanism. When the clutch pedal is depressed, the release bearing housing moves, and the release bearing moves accordingly, pushing the clutch components to disengage the clutch. The clutch disengagement mechanism is existing technology and will not be described in detail here.

[0025] like Figure 1As shown in the figure, the engine flywheel 1 and the clutch pressure plate 5 are respectively located on the front and rear sides of the clutch driven plate 4. At the same time, the edges of the engine flywheel 1 and the clutch pressure plate 5 are rigidly connected by bolts to form a shell-like structure around the clutch driven plate 4. During use, in the initial state, the compression spring in the clutch operating mechanism presses the clutch driven plate 4 against the clutch pressure plate 5, making the clutch driven plate 4 closely fit with the engine flywheel 1 to transmit power. The clutch driven plate 4 then transmits the power to the main drive shaft 6 through splines. The main drive shaft 6 drives the running mechanism to operate through the shifting mechanism. The shifting mechanism realizes the variable-speed and variable-torque output of power through the combination and switching of different gear sets, such as forward gears, reverse gears, high and low speed gears. Of course, the specific structure of the shifting mechanism. When the driver presses the clutch pedal to trigger the clutch operating mechanism, the clutch operating mechanism pushes the clutch driven plate 4 to move axially through a connecting rod or a lever device. The clutch driven plate 4 separates from the clutch pressure plate 5, and the shifting mechanism and the running mechanism lose power and stop working.

[0026] On the other hand, the engine flywheel 1 is connected to the PTO drive shaft 3 through the splines on the connecting sleeve 2. The inner wall of the connecting sleeve 2 is machined with internal rectangular splines or internal involute splines to form a transmission interface with the external splines of the PTO drive shaft 3. The engine flywheel 1 always drives the PTO drive shaft 3 to rotate. The PTO drive shaft 3 transmits the power of the engine flywheel 1 to the active end of the wet clutch 7. The driven end of the wet clutch 7 is connected to the PTO output mechanism. The separation and engagement of the wet clutch are controlled by a hydraulic controller. In the engaged state, the friction plate group at the active end of the wet clutch 7 transmits power through the oil medium to press the friction plates at the driven end, driving the PTO output mechanism to rotate and realizing the external output of power. In the separated state, the friction plate group at the active end of the wet clutch 7 is disengaged from the friction plates at the driven end, and the power transmission is interrupted, facilitating the start and stop of the equipment or the switching of the operation mode. The action of the wet clutch 7 relies on the oil medium to transmit power to press the friction plates. The power transmitted by the oil medium is controlled by an oil solenoid valve group. Therefore, the transmission and disconnection of the PTO power can be realized through the electric control system, and it can cooperate with the hydraulic suspension system of the tractor to achieve linkage cooperation, realizing the simplification of the operation of agricultural implements. Improving the working efficiency of agricultural implements.

[0027] Although some specific embodiments of the present invention have been described in detail above through examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A self-contained double clutch mechanism of a tractor comprising an engine flywheel (1), a main drive shaft (6) connected to a gear shifting mechanism, a PTO drive shaft (3) connected to a PTO output mechanism, characterized in that: The front end of the PTO transmission shaft (3) is fixedly connected to the center of the engine flywheel (1), the main transmission shaft (6) is a hollow shaft, the PTO transmission shaft (3) is rotatably sleeved in the main transmission shaft (6), the front end of the main transmission shaft (6) is provided with an axially movable clutch driven disc (4) through a spline, the rear of the clutch driven disc (4) is provided with a clutch pressure plate (5), the edge of the clutch pressure plate (5) is fixedly connected to the engine flywheel (1) through a bolt; the rear end of the PTO transmission shaft (3) is connected to a PTO output mechanism through a wet clutch (7).

2. The self-contained double clutch mechanism for a tractor as set forth in claim 1, wherein: The front end of the PTO transmission shaft (3) is provided with a connecting sleeve (2) through a spline, the front end of the connecting sleeve (2) is fixedly connected to the engine flywheel (1), the rear end of the connecting sleeve (2) is provided with a bearing seat, the front end bearing (64) is installed in the bearing seat, and the front end of the main transmission shaft (6) is installed in the front end bearing (64).

3. The free-standing double clutch mechanism of a tractor according to claim 1 or 2, characterized in that: The rear end of the PTO transmission shaft (3) is fixedly connected to the driving end of the wet clutch (7), and the driven end of the wet clutch (7) is connected to the PTO output mechanism.

4. The free standing dual clutch mechanism of a tractor as claimed in claim 3 wherein: The PTO output mechanism comprises a PTO driving shaft (8) fixedly connected to the driven end of the wet clutch (7), and a PTO driven shaft (9) drivingly connected to the PTO driving shaft (8) through gear engagement.

5. The free-standing double clutch mechanism of a tractor according to claim 1 or 2, wherein: The outer side of the main transmission shaft (6) is sleeved with a shaft sleeve (60), the shaft sleeve (60) is fixedly connected to the first partition plate (62) in the box body (61); the main transmission shaft (6) extends backward through the first partition plate (62) and is finally installed on the second partition plate (63) through a bearing, and the PTO transmission shaft (3) in the inner cavity of the main transmission shaft (6) extends through the second partition plate (63) into the box body (61) behind the second partition plate (63).

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