Electro-hydraulic control main clutch mechanism and harvester

Abstract

The utility model provides an electro-hydraulic control main clutch mechanism and a harvester, and belongs to the technical field of main clutch electro-hydraulic control of harvesters. The oil tank is connected with the two-position two-way valve through a multi-way valve oil return rubber pipe and a tripping oil return rubber pipe which are connected in sequence; wherein a multi-way valve is further arranged between the multi-way valve oil return rubber pipe and the tripping oil return rubber pipe; the multi-way valve is connected with a rodless cavity of the main clutch oil cylinder through a first pipeline. The multi-way valve is connected with a rod cavity of the main clutch oil cylinder through a second pipeline; the two-position two-way valve is also communicated with the first pipeline; and when the two-position two-way valve is electrified, the oil tank is communicated with the rodless cavity. When the automobile is shut down and flameout occurs, under the condition that the automobile is not started, a rod cavity and a rodless cavity of the oil cylinder are communicated with an oil tank at the same time through a two-position two-way valve, and a piston rod of the main clutch oil cylinder is in a free state, so that a clutch bypasses a dead point by using external force so as to be reset, and the piston rod is retracted; the problem that the main clutch is difficult to reset after the harvester shuts down and flames out is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electro-hydraulic control of a main clutch of a harvester, in particular to an electro-hydraulic controlled main clutch mechanism and a harvester. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Harvesters usually have a hydraulic main clutch system, which uses a main clutch cylinder to realize the engagement and disengagement functions of the main clutch, and control the working device to be in an operating or non-operating state. After the harvester is started, the operator controls the main clutch cylinder to extend, so that the engine and the working device are driven by a belt, thereby realizing the operation of the working device. In order to prevent the vibration generated by the main clutch belt from directly acting on the cylinder, the "over-dead point" main clutch tensioning mechanism absorbs this part of the impact force through a buffer spring, thereby extending the service life of the cylinder. However, when the engine stalls due to holding, due to the presence of the hydraulic lock, this main clutch structure is difficult to reset, and the relevant pipelines need to be removed to reset the clutch, and then restart the engine. This reset method is complicated to operate and has low work efficiency. Utility Model Content

[0004] In order to solve the above technical problems, it is necessary to keep the piston rod of the main clutch cylinder in a free state without starting the vehicle, so that the clutch can be reset by bypassing the "dead point" using external force.

[0005] In order to allow the piston rod to reach a "free state", the utility model provides an electro-hydraulic controlled main clutch mechanism, which uses a two-position two-way valve to allow the rod chamber and the rodless chamber of the oil cylinder to communicate with the oil tank at the same time, so as to solve the problem that the main clutch is difficult to reset after the harvester is stalled.

[0006] The utility model adopts the following technical solutions:

[0007] The first aspect of the present invention provides an electro-hydraulic controlled master clutch mechanism, comprising:

[0008] Fuel tank, multi-way valve, two-position two-way valve and main clutch cylinder;

[0009] The oil tank is connected to a two-position two-way valve via a multi-way valve oil return hose and a vehicle holding oil return hose connected in sequence;

[0010] Wherein, the multi-way valve is further provided between the multi-way valve oil return hose and the engine holding oil return hose;

[0011] The multi-way valve is connected to the rodless chamber of the main clutch oil cylinder through a first pipeline;

[0012] The multi-way valve is connected to the rod chamber of the main clutch oil cylinder through a second pipeline;

[0013] The two-position two-way valve is also connected to the first pipeline;

[0014] When the two-position two-way valve is energized, the oil tank is connected to the rodless chamber.

[0015] Furthermore, the first pipeline includes a first rubber hose, a second steel hose, and a third rubber hose connected in sequence, wherein the first rubber hose and the second steel hose are connected to a two-position two-way valve via a three-way joint.

[0016] Furthermore, a two-position two-way valve is connected between 5 and 8 via a three-way joint.

[0017] Furthermore, the second pipeline includes a first steel pipe and a second rubber pipe connected in sequence.

[0018] Furthermore, the multi-way valve includes an enabling valve and a reversing valve;

[0019] The enabling valve includes a P port and a T port;

[0020] The reversing valve includes an A port and a B port.

[0021] Furthermore, the P port of the enabling valve is connected to the fuel tank through a three-way interface at one end through a multi-way valve oil return hose, and is connected to a two-position two-way valve at the other end through a holding oil return hose.

[0022] Furthermore, the port A of the reversing valve is connected to the first rubber hose, and the port B is connected to the first steel pipe.

[0023] Furthermore, under normal working conditions, when the main clutch is "closed", the oil in the oil tank enters the rodless chamber in the main clutch cylinder through the multi-way valve return oil hose and the first pipeline in turn. At the same time, the oil in the rod chamber in the main clutch cylinder is discharged and transported to the oil tank through the second pipeline and the multi-way valve return oil hose in turn.

[0024] Furthermore, under normal working conditions, when the main clutch is "off", the oil in the oil tank passes through the multi-way valve return oil hose and the second pipeline in turn into the rod chamber in the main clutch cylinder, and the oil in the rodless chamber is transported to the oil tank through the first pipeline and the multi-way valve return oil hose in turn.

[0025] A second aspect of the present invention provides a harvester, which uses the electro-hydraulic controlled main clutch mechanism as described in the first aspect.

[0026] The technical solution of this utility model has the following beneficial effects:

[0027] When the engine stalls due to a jam, the utility model allows the rod chamber and the rodless chamber of the oil cylinder to communicate with the oil tank at the same time through a two-position two-way valve without starting the vehicle, so that the piston rod of the main clutch oil cylinder is in a free state, so that the clutch can be reset by bypassing the "dead point" with external force, and the piston rod can be retracted without disassembling the relevant pipelines, thus solving the problem of the main clutch being difficult to reset after the harvester stalls.

[0028] This reset structure can be manually reset by simply powering on the machine, with clear logic and simple operation.

[0029] The multi-way valve adopts a "single lock" structure and is combined with an external two-position two-way valve to simplify the structure and reduce costs.

[0030] The "over-dead point" main clutch tensioning mechanism will generate vibrations that act on the shock-absorbing spring, thereby increasing the life and reliability of the oil cylinder.

[0031] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0033] Figure 1 2 is a structural diagram of an electro-hydraulic controlled main clutch mechanism in a specific embodiment of the present invention.

[0034] Figure 2 This is one of the hydraulic principle diagrams of an electro-hydraulic controlled main clutch mechanism in a specific embodiment of the utility model, wherein the piston rod cannot be retracted into the main clutch cylinder.

[0035] Figure 3 This is the second hydraulic principle diagram of an electro-hydraulic controlled main clutch mechanism in a specific embodiment of the utility model, wherein the piston rod is in a free telescopic state.

[0036] Markings in the figure:

[0037] 1. Fuel tank, 2. Multi-way valve return oil hose, 3. Multi-way valve, 4. Holding oil return hose, 5. First hose, 6. Two-position two-way valve, 7. First steel pipe, 8. Second steel pipe, 9. Second hose, 10. Third hose, 11. Main clutch cylinder, 12. Shock absorber spring, 13. Pull rod, 14. Main clutch tensioning arm, 15. Main clutch tensioning pulley, 16. Pull plate, 31. Reversing valve, 32. Enabling valve, 33. Overflow valve, 34. Hydraulic lock DETAILED DESCRIPTION

[0038] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0040] In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0041] Example 1

[0042] This embodiment discloses an electro-hydraulic controlled main clutch mechanism, such as Figure 1 As shown, it includes an oil tank 1, a multi-way valve 3, a two-position two-way valve 6 and a main clutch cylinder 11; the oil tank 1 is connected to the two-position two-way valve 6 through a multi-way valve return oil hose 2 and a holding oil return hose 4 which are connected in sequence; wherein, a multi-way valve 3 is also arranged between the multi-way valve return oil hose 2 and the holding oil return hose 4; the multi-way valve 3 is connected to the rodless cavity of the main clutch cylinder 11 through a first pipeline; the multi-way valve 3 is connected to the rod cavity of the main clutch cylinder 11 through a second pipeline; when the two-position two-way valve is energized, the oil tank is connected to the rodless cavity.

[0043] The first pipeline includes a first rubber hose 5, a second steel hose 8, and a third rubber hose 10 connected in sequence, wherein the first rubber hose 5 and the second steel hose 8 are connected to a two-position two-way valve 6 via a three-way joint. The second pipeline includes a first steel hose 7 and a second rubber hose 9 connected in sequence.

[0044] The multi-way valve 3 includes an enabling valve 32, a reversing valve 31, and a relief valve 33. The enabling valve 32 includes ports P and T; the reversing valve 31 includes ports B1 and A1. Port P of the enabling valve 32 is connected to the fuel tank 1 via a three-way interface through the multi-way valve return hose 2 at one end and to a two-position, two-way valve 6 via a holding oil return hose 4 at the other end. Port B1 of the reversing valve 31 is connected to the first hose 5, and port A1 is connected to the first steel pipe 7. The relief valve 33 limits the maximum operating pressure in the hydraulic system, preventing system failure or equipment damage caused by excessive pressure. When the internal system pressure exceeds the set value, the relief valve 33 automatically opens, releasing excess hydraulic oil to ensure safe system operation.

[0045] One end of the third hose 10 is connected to the second steel pipe 8 , and the other end of the third hose 10 is connected to the rod cavity of the main clutch cylinder 11 . One end of the second hose 9 is connected to the first steel pipe 7 , and the other end of the second hose 9 is connected to the rodless cavity of the main clutch cylinder 11 .

[0046] The damping spring 12 is installed on the pull rod 13 to cushion the vibration of the belt and protect the main clutch cylinder 11. The pull rod 13 connects the main clutch tensioning arm 14 and the pull plate 16. The main clutch tensioning pulley 15 is responsible for tensioning the main clutch belt. When the main clutch is "closed", the thrust of the cylinder piston rod acts on the pull plate 16, which drives the pull rod 13. The pull rod 13 drives the main clutch tensioning arm 14 to rotate. The main clutch tensioning arm 14 drives the main clutch tensioning pulley 15. The main clutch tensioning pulley 15 tensions the belt, completing the "close" of the main clutch. When executing "open", the action is the opposite. This is the existing technology and will not be described in detail here.

[0047] Under normal working conditions, when the main clutch is "closed", the oil in the oil tank 1 passes through the multi-way valve oil return hose 2 and the first pipeline in sequence to enter the rodless chamber in the main clutch oil cylinder 11. At the same time, the oil in the rod chamber in the main clutch oil cylinder 11 is discharged and transported to the oil tank 1 in sequence through the second pipeline and the multi-way valve oil return hose 2. Specifically:

[0048] The oil in the oil tank 1 is pumped into the P port of the enabling valve 32 through the gear pump through the multi-way valve return oil hose 2, and the oil is discharged from the B1 port of the reversing valve 31 and sequentially passes through the first hose 5, the second steel pipe 8 and the third hose 10 to transport the oil to the rodless chamber of the main clutch cylinder 11. At the same time, the rod chamber discharges the oil from the main clutch cylinder 11, and the oil returns to the A1 port of the reversing valve 31 through the second hose 9 and the first steel pipe 7 in sequence, and then is transported to the oil tank 1 through the T port through the multi-way valve return oil hose 2.

[0049] Under normal working conditions, when the main clutch is "off", the oil in the oil tank 1 passes through the multi-way valve return oil hose 2 and the second pipeline in turn into the rod chamber in the main clutch cylinder 11, and the oil in the rodless chamber is transported to the oil tank 1 through the first pipeline and the multi-way valve return oil hose 2 in turn.

[0050] Specifically:

[0051] The oil in the oil tank 1 is pumped into the P port of the enabling valve 32 through the gear pump via the multi-way valve return oil hose 2, and the oil is discharged from the A1 port of the reversing valve 31 and sequentially transmitted through the first steel pipe 7 and the second hose 9 to the rod chamber. The oil in the rodless chamber passes through the third hose 10, the second steel pipe 8 and the first hose 5 in sequence and enters the B1 port of the reversing valve 31, and flows out from the T port and is transported to the oil tank 1 via the multi-way valve return oil hose 2.

[0052] The multi-way valve 3 also includes a hydraulic lock 34, a hydraulically controlled one-way valve. Under normal operating conditions, when the solenoid valve is energized to perform the "close" or "disengage" action, the pressure generated by the activation of the enabling valve 32 opens the hydraulic lock 34, allowing oil to flow smoothly into and out of the main clutch cylinder 11. When the engine is stalled, the power source is lost, and the hydraulic lock 34 cannot be opened. Oil can only enter the rodless chamber and cannot flow out, causing the piston rod of the main clutch cylinder 11 to extend but not retract. In the prior art, the first pipeline must be disassembled to reset the clutch and restart the engine. This disassembly process can cause oil leakage and contamination, is cumbersome, and requires reinstalling the pipeline, which shortens the pipeline life and reduces work efficiency. The present utility model energizes the external two-position two-way valve 6, directly connecting the rodless chamber to the fuel tank 1. Oil can bypass the hydraulic lock 34 and return to the fuel tank 1. The piston is now free and can be manually reset. This simple operation eliminates the need to disassemble any pipelines, reducing labor intensity and improving work efficiency.

[0053] When the car is stalled, the engine stops working, but the power supply in the car is normal. The gear pump needs to be running when the engine is running, so the gear pump cannot work. However, the two-position two-way valve 6 is powered by the power supply in the car, so it can work normally.

[0054] When the engine is held and the ignition is turned off, the main clutch is in the "closed" state, the two-position two-way valve 6 is energized, and the oil in the rodless chamber of the main clutch cylinder 11 is transported to the oil tank 1 in sequence from the third hose 10, the second steel pipe 8, the engine holding oil return hose 4 and the multi-way valve oil return hose 2, so that the piston in the main clutch cylinder 11 is in a free extension and contraction state.

[0055] When the engine is stalled, the hydraulic lock 34 in the multi-way valve 3 cannot be opened, the rodless chamber is disconnected from the fuel tank 1, and the piston rod cannot retract into the main clutch cylinder 11. At this time, when the two-position two-way valve 6 is energized, the multi-way valve oil return hose 2 serves as the oil return pipe for the rodless chamber, connecting the rodless chamber to the fuel tank 1, and the piston rod is in a freely retractable state. It is important to note that during normal operation (i.e., when the engine is stalled), the multi-way valve oil return hose 2 serves as the oil return pipe for the multi-way valve 3.

[0056] Working principle of this utility model:

[0057] When the machine is working normally, Figure 2 As shown, the multi-way valve 3 and the two-position two-way valve 6 are both in a power-off state, the oil in the rodless chamber cannot return to the oil tank 1 through the hydraulic lock 34, and the piston rod cannot retract into the main clutch cylinder 11. At this time, the main clutch is in the engaged state.

[0058] When an accident occurs and the vehicle stalls, that is, when the engine speed is detected to be 0 and the piston rod of the main clutch oil cylinder 11 is not retracted, the two-position two-way valve is energized, connecting the rodless cavity of the main clutch oil cylinder 11 with the oil tank 1, so that the piston rod is in a free extension state, such as Figure 3 At this point, you can use external force to reset the clutch, and the engine power output will be in a no-load state when you start the vehicle again.

[0059] When the engine stalls, the hydraulic lock 34 is provided in the hydraulic main clutch system, and the piston rod of the main clutch cylinder 11 cannot be retracted by manually shutting down the engine. Usually, it is necessary to disassemble the oil pipe to loosen the main clutch transmission belt, and even adjust the tension of the main clutch belt transmission, resulting in a lot of time and effort. However, the utility model allows the rod chamber and the rodless chamber of the cylinder to communicate with the oil tank 1 at the same time through a two-position two-way valve without starting the vehicle, so that the piston rod of the main clutch cylinder is in a free state, so that the clutch can be reset by bypassing the "dead point" with external force, thereby retracting the piston rod, thereby solving the problem of the main clutch being difficult to reset after the harvester stalls.

[0060] Example 2

[0061] This embodiment provides a harvester that uses the electro-hydraulic controlled main clutch mechanism of Example 1.

[0062] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. An electro-hydraulic controlled main clutch mechanism, characterized in that: It includes oil tank, multi-way valve, two-position two-way valve and main clutch oil cylinder; The oil tank is connected to a two-position two-way valve via a multi-way valve oil return hose and a vehicle holding oil return hose connected in sequence; Wherein, the multi-way valve is further provided between the multi-way valve oil return hose and the engine holding oil return hose; The multi-way valve is connected to the rodless chamber of the main clutch oil cylinder through a first pipeline; The multi-way valve is connected to the rod chamber of the main clutch oil cylinder through a second pipeline; The two-position two-way valve is also connected to the first pipeline; When the two-position two-way valve is energized, the oil tank is connected to the rodless chamber.

2. The electro-hydraulic controlled master clutch mechanism according to claim 1, characterized in that: The first pipeline includes a first rubber hose, a second steel hose, and a third rubber hose that are connected in sequence, wherein the first rubber hose and the second steel hose are connected to a two-position two-way valve via a three-way joint.

3. The electro-hydraulic controlled master clutch mechanism according to claim 2, characterized in that: A two-position, two-way valve is connected between 5 and 8 via a three-way connector.

4. The electro-hydraulic controlled master clutch mechanism according to claim 3, characterized in that: The second pipeline includes a first steel pipe and a second rubber pipe connected in sequence.

5. The electro-hydraulic controlled master clutch mechanism according to claim 4, characterized in that: The multi-way valve includes an enabling valve and a reversing valve; The enabling valve includes a P port and a T port; The reversing valve includes a B1 port and an A1 port.

6. The electro-hydraulic controlled master clutch mechanism according to claim 5, characterized in that: The P port of the enabling valve is connected to the fuel tank through a three-way interface at one end through a multi-way valve oil return hose, and is connected to a two-position two-way valve at the other end through a vehicle holding oil return hose.

7. The electro-hydraulic controlled master clutch mechanism according to claim 5, characterized in that: The B1 port of the reversing valve is connected to the first rubber hose, and the A1 port is connected to the first steel pipe.

8. The electro-hydraulic controlled master clutch mechanism according to claim 1, characterized in that: Under normal working conditions, when the main clutch is "closed", the oil in the oil tank passes through the multi-way valve return oil hose and the first pipeline in turn into the rodless chamber in the main clutch cylinder. At the same time, the oil in the rod chamber in the main clutch cylinder is discharged and transported to the oil tank through the second pipeline and the multi-way valve return oil hose in turn.

9. The electro-hydraulic controlled master clutch mechanism according to claim 1, characterized in that: Under normal working conditions, when the main clutch is "off", the oil in the oil tank passes through the multi-way valve return oil hose and the second pipeline in turn into the rod chamber in the main clutch cylinder, and the oil in the rodless chamber is transported to the oil tank through the first pipeline and the multi-way valve return oil hose in turn.

10. A harvester, characterized in that: An electro-hydraulic controlled main clutch mechanism according to any one of claims 1 to 9 is provided.

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