Agricultural machinery speed control system and agricultural machinery

Abstract

The utility model relates to the field of agricultural machinery, and discloses an agricultural machinery speed control system and agricultural machinery, the agricultural machinery speed control system comprises a gearbox, the outer end of each gear shifting pull rod of the gearbox extends out of a box body; the gear shifting driving mechanism comprises a fixing structure, a plurality of connecting structures and a plurality of electric telescopic devices, the connecting structures and the gear shifting pull rods are arranged in a one-to-one correspondence mode, the electric telescopic devices and the connecting structures are arranged in a one-to-one correspondence mode, and the fixing structure is fixed to the outer wall of the box body; each electric telescopic device is arranged on the fixing structure and provided with a telescopic rod capable of moving in a telescopic mode, and each connecting structure is connected with the outer end of the corresponding telescopic rod and the outer end of the corresponding gear shifting pull rod. The agricultural machine speed control system can greatly save manpower, improve the gear shifting efficiency and reduce the risk of oil way leakage during gear shifting, and has the advantages of being high in structural compactness, good in machine part stress, high in gear shifting transmission efficiency, high in universality and interchangeability and the like.

Description

Technical Field

[0001] This application belongs to the technical field of agricultural machinery, and particularly relates to an agricultural machinery speed change system and an agricultural machine. Background Art

[0002] The traveling gearboxes of agricultural machines such as wheat harvesters in China generally adopt mechanical shifting structures. Whether it is an up-shifting structure or a side-shifting structure, a mechanical pull rod structure or a flexible cable structure is used to achieve mechanical shifting. Among them, the mechanical pull rod shifting structure has problems such as being bulky, occupying a large space, and having a relatively high cost. In contrast, the flexible cable shifting structure occupies a relatively small space and has a relatively low cost, so it is widely used in domestic harvesters.

[0003] However, whether it is a mechanical pull rod structure or a flexible cable structure, there are problems of time-consuming and laborious shifting and low efficiency. Therefore, at the present stage, it is necessary to further optimize the shifting method of the traveling gearbox of agricultural machinery. Utility Model Content

[0004] The purpose of this application is to provide an agricultural machinery speed change system and an agricultural machine, which can optimize the shifting method to greatly save manpower and improve the shifting efficiency.

[0005] To achieve the above purpose, on the one hand, this application provides an agricultural machinery speed change system, which includes:

[0006] A gearbox, including a box body, a speed change transmission mechanism arranged in the box body, and a plurality of shifting pull rods for switching the gears of the speed change transmission mechanism. The outer ends of each of the shifting pull rods extend outside the box body; and

[0007] A shifting driving mechanism, including a fixing structure, a plurality of connecting structures, and a plurality of electric telescopic devices. The plurality of connecting structures are arranged in one-to-one correspondence with the plurality of shifting pull rods, the plurality of electric telescopic devices are arranged in one-to-one correspondence with the plurality of connecting structures, the fixing structure is fixed on the outer wall of the box body, each of the electric telescopic devices is arranged on the fixing structure and is provided with a telescopic rod capable of telescopic movement, and each of the connecting structures connects the outer end of the corresponding telescopic rod and the outer end of the corresponding shifting pull rod.

[0008] In some embodiments, the agricultural machinery speed change system further includes:

[0009] A plurality of state detection devices, respectively used to detect the real-time working states of the plurality of electric telescopic devices;

[0010] A processing device communicates with the plurality of electric telescopic devices and the plurality of state detection devices, and is configured to be able to start and stop the plurality of electric telescopic devices and determine the real-time gear position of the speed change transmission mechanism according to the real-time working states of the plurality of electric telescopic devices.

[0011] In some embodiments, the state detection device includes an electrical parameter sensor for detecting the real-time electrical parameters of the electric telescopic device;

[0012] And / or, the state detection device includes a plurality of position sensors arranged at intervals in sequence along the telescopic direction of the electric telescopic device and for detecting the real-time position of the telescopic rod, and the plurality of position sensors are arranged in one-to-one correspondence with the plurality of gear positions of the speed change transmission mechanism.

[0013] In some embodiments, the agricultural machinery speed change system further includes:

[0014] A plurality of temperature detection devices, respectively used for detecting the temperatures of the plurality of electric telescopic devices;

[0015] A processing device communicates with the plurality of electric telescopic devices and the plurality of temperature detection devices, and is configured to be able to stop the corresponding electric telescopic device and / or emit an alarm signal when the temperature of any one of the electric telescopic devices is higher than a preset maximum temperature.

[0016] In some embodiments, the agricultural machinery speed change system further includes:

[0017] A plurality of current detection devices, respectively used for detecting the working currents of the plurality of electric telescopic devices;

[0018] A processing device communicates with the plurality of electric telescopic devices and the plurality of current detection devices, and is configured to be able to perform at least one of stopping the corresponding electric telescopic device, controlling the telescopic rod of the corresponding electric telescopic device to move reversely, and emitting an alarm signal when the working current of any one of the electric telescopic devices is greater than a preset maximum current.

[0019] In some embodiments, the agricultural machinery speed change system further includes a hydraulic motor for driving the rotation of the power input shaft of the gearbox, and the shift driving mechanism is arranged on one side of the box body where the power output shaft of the gearbox extends;

[0020] And / or, the agricultural machinery speed change system further includes a mechanical handbrake connected to the gearbox, the mechanical handbrake includes a handbrake pulley and a handbrake cable, and the shift driving mechanism is arranged between the handbrake pulley and the handbrake cable;

[0021] And / or, the agricultural machinery speed change system further includes an electronic handbrake connected to the gearbox, and the shift driving mechanism is arranged above the electronic handbrake.

[0022] In some embodiments, the shift driving mechanism further includes a first bolt assembly passing through and fixing the outer walls of the fixed structure and the box body, a first pin passing through and hinging the fixed structure and the electric telescopic device, a second bolt assembly passing through and fixing the outer end of the connecting structure and the shift lever, and a second pin passing through and hinging the outer end of the connecting structure and the outer end of the telescopic rod.

[0023] In some embodiments, the agricultural machinery speed change system further includes:

[0024] A hydraulic motor for driving the power input shaft of the gearbox to rotate, and including a first pressure measuring port and a second pressure measuring port;

[0025] An on-off valve including an on-off first oil port and a second oil port, the first oil port is connected to the first pressure measuring port through a pipeline, the second oil port is connected to the second pressure measuring port through a pipeline, and the on-off valve can conduct the first oil port and the second oil port when the speed change transmission mechanism shifts gears.

[0026] In some embodiments, the agricultural machinery speed change system includes:

[0027] A shift trigger mechanism including a plurality of gear trigger keys corresponding to a plurality of gears of the speed change transmission mechanism one by one, and each of the gear trigger keys is used to generate a gear trigger command corresponding to the gear;

[0028] A processing device communicates with the shift trigger mechanism and a plurality of the electric telescopic devices, and is configured to be able to control the plurality of electric telescopic devices to act cooperatively according to the received gear trigger command so that the speed change transmission mechanism is shifted into the corresponding gear.

[0029] The second aspect of the present application further provides an agricultural machine including the above-mentioned agricultural machinery speed change system.

[0030] Through the above technical solution, when the agricultural machinery speed change system in the present application needs to shift gears, a plurality of electric telescopic devices can be used to drive a plurality of connecting structures respectively, and then the plurality of connecting structures can drive a plurality of shift levers of the gearbox to move respectively, so as to switch the speed change transmission mechanism of the gearbox to the target gear. Since the gear shift is electrically driven, compared with the existing gear shift method of the manual operation mechanical gear shift structure, the agricultural machinery speed change system of the present application can greatly save manpower and improve the gear shift efficiency, and the electric telescopic device is a pure electric power source, without the need to add a complex hydraulic oil circuit, which can greatly reduce the risk of oil leakage, reduce the failure rate, improve the use safety, and is economical and environmentally friendly.

[0031] In addition, the shifting drive mechanism is integrally fixed to the outer wall of the gearbox by using a fixed structure, and the shifting rod is driven by a simple connection structure between the shifting rod and the corresponding electric telescopic device. This can not only improve the structural compactness of the entire agricultural machinery transmission system, reduce the space occupied by the system, but also make the force on the shifting rod better, extend the service life of the components, and effectively improve the shifting transmission efficiency.

[0032] Furthermore, the agricultural machinery transmission system of the present application does not need to change the overall structure and sealing performance of the existing gearbox. By replacing the connection structure and / or fixed structure of different specifications, the connection and use of the shifting drive mechanism with different models of gearboxes can be realized, and the versatility and interchangeability are strong.

[0033] In summary, by adopting the agricultural machinery transmission system of the present application, agricultural machinery such as harvesters can develop in the direction of high efficiency, high comfort, and unmanned features such as automation and intelligence.

[0034] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific embodiment part. Brief Description of the Drawings

[0035] The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation to the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts. In the drawings:

[0036] Figure 1 is a schematic diagram of an agricultural machinery transmission system in a specific embodiment of the present application;

[0037] Figure 2 is Figure 1 a schematic diagram of the agricultural machinery transmission system in another perspective;

[0038] Figure 3 is Figure 2 a partial enlarged view B of the agricultural machinery transmission system in, and shows the respective strokes of the electric cylinder I and the electric cylinder II at different gear positions of the gearbox corresponding to this partial enlarged view B;

[0039] Figure 4 is a schematic diagram of an optional first connection structure and a second connection structure in a specific embodiment of the present application.

[0040] Explanation of the Reference Numerals in the Drawings

[0041] 1 Gearbox 2 On-off valve

[0042] 3 Hydraulic motor 4 Handbrake cable

[0043] 5 Handbrake pulley 6 Second connection structure

[0044] 7 First pin 8 First electric telescopic device

[0045] 9 Second electric telescopic device 10 Position sensor

[0046] 11 Fixing structure 12 First connection structure

[0047] 13 First shift lever 14 Second shift lever Detailed implementation manners

[0048] The following will describe in detail the detailed implementation manners of the present application with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only for explaining and illustrating the present application, and are not used to limit the present application.

[0049] Refer to Figures 1 to 4 , a first exemplary embodiment of the present application provides an agricultural machinery transmission system, which includes:

[0050] Gearbox 1, including a box body, a speed change transmission mechanism arranged in the box body, and a plurality of shift levers for switching the gears of the speed change transmission mechanism, and the outer ends of each shift lever extend out of the box body; and

[0051] Shift driving mechanism, including a fixing structure 11, a plurality of connection structures, and a plurality of electric telescopic devices (such as electric cylinders, linear motors, etc.), the plurality of connection structures are arranged in one-to-one correspondence with the plurality of shift levers, the plurality of electric telescopic devices are arranged in one-to-one correspondence with the plurality of connection structures, the fixing structure 11 is fixed on the outer wall of the box body, each electric telescopic device is arranged on the fixing structure 11 and is provided with a telescopic rod capable of telescopic movement, and each connection structure connects the outer end of the corresponding telescopic rod and the outer end of the corresponding shift lever.

[0052] It should be noted that to switch the speed change transmission mechanism to a certain gear, it is necessary for each of the plurality of shift levers to meet the corresponding stroke requirements to ensure successful engagement of the gear. Therefore, it is also required that each of the plurality of electric telescopic devices meets the corresponding stroke requirements. For different gears, the stroke combinations of the plurality of electric telescopic devices are also different.

[0053] For example, refer to Figure 2 and Figure 3 , the plurality of electric telescopic devices may include a first electric telescopic device 8 and a second electric telescopic device 9, the plurality of connection structures may include a first connection structure 12 and a second connection structure 6, and the plurality of shift levers may include a first shift lever 13 and a second shift lever 14. Among them, the first electric telescopic device 8 uses electric cylinder I and connects the first shift lever 13 through the first connection structure 12, and the second electric telescopic device 9 uses electric cylinder II and connects the second shift lever 14 through the second connection structure 6.

[0054] When the motor in the electric cylinder I rotates forward, the piston rod of the electric cylinder I extends to drive the first connection structure 12 to push the first shift lever 13 to move to the right; when the motor in the electric cylinder I rotates reversely, the piston rod of the electric cylinder I retracts to drive the first connection structure 12 to pull the first shift lever 13 to move to the left.

[0055] When the motor in the electric cylinder II rotates forward, the piston rod of the electric cylinder II extends to drive the second connection structure 6 to push the second shift lever 14 to move to the right; when the motor in the electric cylinder II rotates reversely, the piston rod of the electric cylinder II retracts to drive the second connection structure 6 to pull the second shift lever 14 to move to the left.

[0056] To switch the speed transmission mechanism to a certain gear, it is necessary for both the first shift lever 13 and the second shift lever 14 to meet the corresponding stroke requirements respectively to ensure successful engagement of this gear. Therefore, it is also required that both the electric cylinder I and the electric cylinder II meet the corresponding stroke requirements respectively.

[0057] Specifically, refer to Figure 3 , when shifting to the N gear (i.e., the neutral gear), the piston rods of both the electric cylinder I and the electric cylinder II reach the position N, indicating that the shift to the N gear is successful. When shifting to the first gear, it is necessary to first let the piston rods of both the electric cylinder I and the electric cylinder II return to the position N, and then the piston rod stroke of the electric cylinder I reaches the position H, indicating that the shift to the first gear is successful. When shifting to the second gear, it is necessary to first let the piston rods of both the electric cylinder I and the electric cylinder II return to the position N, and then the piston rod stroke of the electric cylinder II reaches the position L, indicating that the shift to the second gear is successful. When shifting to the third gear, it is necessary to first let the piston rods of both the electric cylinder I and the electric cylinder II return to the position N, and then the piston rod stroke of the electric cylinder II reaches the position H, indicating that the shift to the third gear is successful.

[0058] In addition, the agricultural machinery speed change system of the present application does not limit the number of gears of the gearbox (for example, two-speed change, three-speed change, four-speed change, etc. are all acceptable), but it is necessary to ensure that multiple connection structures and multiple shift levers are arranged in one-to-one correspondence, and multiple electric telescopic devices and multiple connection structures are arranged in one-to-one correspondence.

[0059] Through the above technical solutions, when the agricultural machinery speed change system of the present application needs to shift gears, multiple electric telescopic devices can be used to drive multiple connection structures respectively, and then multiple connection structures can drive multiple shift levers of the gearbox 1 to move respectively, so as to switch the speed transmission mechanism of the gearbox 1 to the target gear. Since the gear shift is electrically driven, compared with the existing gear shift method of manual operation mechanical shift structure, the agricultural machinery speed change system of the present application can greatly save manpower and improve the gear shift efficiency. Moreover, the electric telescopic device is a pure electric power source, without the need to add complex hydraulic oil circuits, which can greatly reduce the risk of oil leakage, reduce the failure rate, improve the use safety, and is economical and environmentally friendly.

[0060] In addition, the shift driving mechanism is integrally fixed to the outer wall of the transmission 1 by the fixed structure 11, and the shift lever is driven by a simple connection structure between the shift lever and the corresponding electric telescopic device. This can not only improve the structural compactness of the entire agricultural machinery transmission system, reduce the space occupied by the system, but also enable the shift lever to be better stressed, extend the service life of the parts, and effectively improve the shift transmission efficiency.

[0061] Furthermore, the agricultural machinery transmission system of the present application does not need to change the overall structure and sealing performance of the existing transmission 1. By replacing the connection structure and / or the fixed structure 11 with different specifications, the connection and use of the shift driving mechanism with different models of transmissions 1 can be realized, and the versatility and interchangeability are strong.

[0062] In summary, by adopting the agricultural machinery transmission system of the present application, agricultural machinery such as harvesters can develop in the direction of high efficiency, high comfort, automation, intelligence and other unmanned directions.

[0063] In some embodiments, the agricultural machinery transmission system may further include:

[0064] A plurality of state detection devices respectively configured to detect the real-time working states of a plurality of electric telescopic devices;

[0065] A processing device communicating with the plurality of electric telescopic devices and the plurality of state detection devices, and configured to be able to start and stop the plurality of electric telescopic devices and be able to determine the real-time gear position of the speed change transmission mechanism according to the real-time working states of the plurality of electric telescopic devices.

[0066] When the stroke of the electric telescopic device changes, its real-time working state will change accordingly. Therefore, by detecting the real-time working state of the corresponding electric telescopic device through the state detection device and feeding back the real-time working state to the processing device, the processing device can analyze the real-time working state information, so as to accurately determine the stroke information of the telescopic rod of the electric telescopic device. Therefore, when the processing device receives the real-time working states of the plurality of electric telescopic devices respectively detected by the plurality of state detection devices, it can accurately determine the stroke information of the telescopic rods of the plurality of electric telescopic devices. Thus, by communicating the processing device with the plurality of electric telescopic devices and the plurality of state detection devices, a closed-loop control of the stroke of the telescopic rods of the plurality of electric telescopic devices can be realized, ensuring that the real-time gear position of the speed change transmission mechanism is switched to the required target gear position.

[0067] In some embodiments, the state detection device may include an electrical parameter sensor for detecting the real-time electrical parameters of the electric telescopic device (for example, a potentiometer can be used to detect the real-time voltage of the motor in the electric telescopic device). At this time, the processing device can analyze the real-time electrical parameters to accurately determine the stroke information of the telescopic rod of the electric telescopic device.

[0068] It should be noted that in the existing multi-speed gearboxes, an interlock mechanism must be provided between different shift levers to avoid the situation where the gearbox is engaged in two gears simultaneously, which may cause damage to the gears of the gearbox. Since the agricultural machinery transmission system of the present application does not involve improvements to the internal structure of the gearbox 1, the interlock mechanism should also be provided in the gearbox 1.

[0069] During the gear shifting process of the agricultural machinery transmission system of the present application, if the electric telescopic device suddenly loses power, it may be impossible to successfully engage the gear. However, even if the power supply to the electric telescopic device is restored at this time, it is not advisable to manually start the electric telescopic device rashly. This is because in the case of sudden power loss, it is impossible to determine the actual stroke of the telescopic rod of the electric telescopic device. Due to the presence of the interlock mechanism, if the electric telescopic device is manually started rashly and the moving direction and displacement of the telescopic rod are incorrect, it will cause damage to the internal interlock mechanism of the gearbox.

[0070] In this embodiment, by providing an electrical parameter sensor and a processing device, when the electric telescopic device is restored to power, the electrical parameter sensor can immediately detect the real-time electrical parameters of the electric telescopic device, and the processing device can immediately analyze the real-time electrical parameters, so as to accurately determine the real-time stroke of the telescopic rod of the electric telescopic device. Furthermore, the moving direction and displacement of the telescopic rod can be accurately controlled, enabling the system to continue to complete the unfinished gear shifting operation, ensuring that the gearbox 1 can be engaged in the target gear, avoiding damage to the internal interlock mechanism of the gearbox, and effectively improving the emergency performance and gear engagement success rate of the agricultural machinery transmission system.

[0071] In some embodiments, the state detection device may include a plurality of position sensors 10 arranged at intervals along the telescopic direction of the electric telescopic device and used to detect the real-time position of the telescopic rod of the electric telescopic device. The plurality of position sensors 10 are arranged in one-to-one correspondence with the multiple gears of the speed change transmission mechanism.

[0072] The position sensor 10 of this embodiment can adopt a contact sensor or a proximity sensor. When the telescopic rod moves into the sensing range of a certain position sensor 10, the position sensor 10 can send a corresponding position signal to the processing device, and the processing device can analyze the position signal to accurately determine the stroke information of the telescopic rod.

[0073] For example, the position sensor 10 can adopt a magnetic induction switch. At this time, a magnetic induction coil can be installed on the telescopic rod. When the telescopic rod reaches the required gear stroke during the telescopic process, the magnetic induction coil on the telescopic rod is just within the sensing range of the corresponding magnetic induction switch. At this time, the magnetic induction switch is triggered and sends a corresponding position signal to the processing device, and the processing device can analyze the position signal to determine that the telescopic rod reaches the required gear stroke at this time.

[0074] The above-mentioned position sensor 10 and electrical parameter sensor can either be selectively set in the agricultural machinery transmission system or be set simultaneously. This application does not limit this. When the position sensor 10 and the electrical parameter sensor are both provided in the agricultural machinery transmission system, double insurance for shift stroke detection can be achieved, preventing the phenomenon of gear disengagement caused by insufficient gear stroke when the transmission 1 shifts gears.

[0075] In some embodiments, the agricultural machinery transmission system may further include:

[0076] A plurality of temperature detection devices, respectively configured to detect the temperatures of a plurality of electric telescopic devices (for example, respectively configured to detect the temperatures of the motors in a plurality of electric telescopic devices);

[0077] A processing device, communicating with the plurality of electric telescopic devices and the plurality of temperature detection devices, and configured to be able to stop the corresponding electric telescopic device and / or send an alarm signal to remind the operator when the temperature of any one of the electric telescopic devices is higher than a preset maximum temperature.

[0078] Through the setting of this embodiment, the agricultural machinery transmission system has an overheat protection function for a plurality of electric telescopic devices, can effectively improve the use safety and reliability, avoid overheating damage of the electric telescopic devices, and extend their service life.

[0079] In some embodiments, the agricultural machinery transmission system may further include:

[0080] A plurality of current detection devices, respectively configured to detect the operating currents of a plurality of electric telescopic devices (for example, respectively configured to detect the operating currents of the motors in a plurality of electric telescopic devices);

[0081] A processing device, communicating with the plurality of electric telescopic devices and the plurality of current detection devices, and configured to be able to perform at least one of stopping the corresponding electric telescopic device, controlling the telescopic rod of the corresponding electric telescopic device to move in the reverse direction, and sending an alarm signal when the operating current of any one of the electric telescopic devices is greater than a preset maximum current.

[0082] During the shifting process, when the shifting resistance is greater than the thrust of the electric telescopic device, the electric telescopic device will experience an overload phenomenon, and the operating current of the electric telescopic device will instantaneously increase, resulting in overheating of the electric telescopic device. And through the setting of this embodiment, when the operating current of any one of the electric telescopic devices is greater than the preset maximum current, the processing device can stop the corresponding electric telescopic device, and / or control the telescopic rod of the corresponding electric telescopic device to move in the reverse direction so that the telescopic rod retracts to the neutral gear stroke position, and / or send an alarm signal, thereby enabling the agricultural machinery transmission system to have an overload protection function for a plurality of electric telescopic devices, can effectively improve the use safety and reliability, avoid overload damage of the electric telescopic devices, and extend their service life.

[0083] In some embodiments, the agricultural machinery speed change system further includes a hydraulic motor 3 for driving the power input shaft of the gearbox 1 to rotate, and the shift driving mechanism is arranged on one side of the box body where the power output shaft of the gearbox 1 extends;

[0084] And / or, the agricultural machinery speed change system further includes a mechanical handbrake connected to the gearbox 1. The mechanical handbrake includes a handbrake pulley 5 and a handbrake cable 4, and the shift driving mechanism is arranged between the handbrake pulley 5 and the handbrake cable 4;

[0085] And / or, the agricultural machinery speed change system further includes an electronic handbrake connected to the gearbox 1, and the shift driving mechanism is arranged above the electronic handbrake.

[0086] Through the arrangement of the shift driving mechanism set in this embodiment, not only can the structural compactness of the agricultural machinery speed change system be improved, but also the interference between the shift driving mechanism and the front bridge of the agricultural machinery can be prevented, so as to facilitate the installation and use of the agricultural machinery speed change system in the agricultural machinery and improve the practicability.

[0087] In some embodiments, the shift driving mechanism further includes a first bolt assembly passing through and fixing the structure 11 and the outer wall of the box body, a first pin 7 passing through and hinging the fixed structure 11 and the electric telescopic device, a second bolt assembly passing through and connecting the fixed connection structure and the outer end of the shift lever, and a second pin passing through and hinging the connection structure and the outer end of the telescopic rod. By adopting simple detachable connection structures such as bolt assemblies and pins, the entire shift driving mechanism can be more easily disassembled and assembled, thus facilitating maintenance.

[0088] In some embodiments, the agricultural machinery speed change system may further include:

[0089] A hydraulic motor 3 for driving the power input shaft of the gearbox 1 to rotate, and including a first pressure measuring port and a second pressure measuring port;

[0090] An on-off valve 2, including an on-off first oil port and a second oil port. The first oil port is connected to the first pressure measuring port through a pipeline, and the second oil port is connected to the second pressure measuring port through a pipeline. The on-off valve 2 can conduct the first oil port and the second oil port when the speed change transmission mechanism shifts gears.

[0091] Through the setting of this embodiment, when shifting gears, the first oil port and the second oil port of the on-off valve 2 can be conducted, so that the first pressure measuring port and the second pressure measuring port of the hydraulic motor 3 are conducted, and the pressure of the oil inlet and the oil outlet of the hydraulic motor 3 reaches a balanced state. At this time, the motor output shaft of the hydraulic motor is in a free state, which can reduce the resistance of the motor hydraulic pressure to the power input shaft of the gearbox during the gear shifting process and improve the gear shifting success rate.

[0092] The present application does not limit the specific valve type selection of the on-off valve 2. For example, the on-off valve 2 can adopt a normally closed solenoid valve. During gear shifting, the solenoid valve can be energized to conduct the first oil port and the second oil port, and when gear shifting is not required, the solenoid valve can be de-energized to cut off the conduction between the first oil port and the second oil port.

[0093] In some embodiments, an agricultural machinery transmission system may include:

[0094] A gear shifting trigger mechanism, including a plurality of gear trigger keys respectively arranged corresponding to a plurality of gears of the transmission mechanism, and each gear trigger key is used to generate a gear trigger command corresponding to the corresponding gear;

[0095] A processing device, communicating with the gear shifting trigger mechanism and a plurality of electric telescopic devices, and configured to be able to control the coordinated action of the plurality of electric telescopic devices according to the received gear trigger command so that the transmission mechanism is engaged in the corresponding gear.

[0096] By triggering gear shifting with a gear trigger key, no matter which gear the gearbox 1 is currently in, only the corresponding gear trigger key of the required gear needs to be triggered, and the gearbox 1 can be shifted to the required gear, realizing one-key gear shifting, which saves time and effort.

[0097] It should be noted that the gear trigger key can be either a physical button or a touch button, and the present application does not limit this. For example, when the gear trigger key is a physical button, the gear trigger key can be set on the armrest box of the agricultural machinery cab; for another example, when the gear trigger key is a touch button, the gear trigger key can be displayed on the touch panel of the agricultural machinery cab.

[0098] Finally, for the agricultural machinery transmission system of the present application, it should also be supplemented that the gearbox 1 adopted can be any existing form of agricultural machinery gearbox, such as a sliding gear gearbox, a dog clutch gearbox, etc., and all can be applied to the agricultural machinery transmission system of the present application. Among them, for the sliding gear gearbox, it realizes power transmission in the corresponding gear by pushing the shifting gear (i.e., the sliding gear) on the transmission shaft to the meshing position to mesh with the corresponding gear; for the dog clutch gearbox, it realizes power transmission in the corresponding gear by the internal spline of the dog clutch meshing with the external spline of the gear and the external spline of the transmission shaft.

[0099] In addition, the second exemplary embodiment of the present application also provides an agricultural machinery, such as a harvester, a tractor, etc. This agricultural machinery includes the above-mentioned agricultural machinery transmission system, and thus also has all the technical effects brought by this agricultural machinery transmission system, which will not be elaborated here.

[0100] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0101] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0102] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0103] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. Agricultural machinery speed change system, characterized in that, Comprising: A transmission (1), including a housing, a speed-changing transmission mechanism disposed within the housing, and a plurality of shift rods for switching the gears of the speed-changing transmission mechanism, with the outer ends of each of the shift rods extending outside the housing; And A shift driving mechanism, including a fixed structure (11), a plurality of connection structures, and a plurality of electric telescopic devices. The plurality of connection structures are arranged in one-to-one correspondence with the plurality of shift rods, and the plurality of electric telescopic devices are arranged in one-to-one correspondence with the plurality of connection structures. The fixed structure (11) is fixed to the outer wall of the housing, each of the electric telescopic devices is disposed on the fixed structure (11) and is provided with a telescopic rod capable of telescopic movement, and each of the connection structures connects the outer end of the corresponding telescopic rod and the outer end of the corresponding shift rod.

2. The agricultural machinery speed change system according to claim 1, wherein The agricultural machinery speed-changing system further includes: A plurality of state detection devices, respectively configured to detect the real-time working states of the plurality of electric telescopic devices; A processing device, communicating with the plurality of electric telescopic devices and the plurality of state detection devices, and configured to be able to start and stop the plurality of electric telescopic devices and determine the real-time gear position of the speed-changing transmission mechanism according to the real-time working states of the plurality of electric telescopic devices.

3. The agricultural machinery speed change system according to claim 2, wherein, The state detection device includes an electrical parameter sensor for detecting the real-time electrical parameters of the electric telescopic device; And / or, the state detection device includes a plurality of position sensors (10) arranged at intervals in sequence along the telescopic direction of the electric telescopic device and configured to detect the real-time position of the telescopic rod, and the plurality of position sensors (10) are arranged in one-to-one correspondence with the plurality of gears of the speed-changing transmission mechanism.

4. The agricultural machinery speed change system according to claim 1, characterized in that, The agricultural machinery speed-changing system further includes: A plurality of temperature detection devices, respectively configured to detect the temperatures of the plurality of electric telescopic devices; A processing device, communicating with the plurality of electric telescopic devices and the plurality of temperature detection devices, and configured to be able to stop the corresponding electric telescopic device and / or emit an alarm signal when the temperature of any one of the electric telescopic devices is higher than a preset maximum temperature.

5. The agricultural machinery speed change system according to claim 1, characterized in that, The agricultural machinery speed-changing system further includes: A plurality of current detection devices, respectively configured to detect the working currents of the plurality of electric telescopic devices; A processing device, communicating with the plurality of electric telescopic devices and the plurality of current detection devices, and configured to be able to perform at least one of stopping the corresponding electric telescopic device, controlling the telescopic rod of the corresponding electric telescopic device to move in the reverse direction, and emitting an alarm signal when the working current of any one of the electric telescopic devices is greater than a preset maximum current.

6. The agricultural machinery speed change system according to claim 1, characterized in that, The agricultural machinery speed-changing system further includes a hydraulic motor (3) for driving the rotation of the power input shaft of the transmission (1), and the shift driving mechanism is arranged on the side of the housing where the power output shaft of the transmission (1) extends; And / or, the agricultural machinery speed-changing system further includes a mechanical handbrake connected to the transmission (1), the mechanical handbrake includes a handbrake pulley (5) and a handbrake cable (4), and the shift driving mechanism is arranged between the handbrake pulley (5) and the handbrake cable (4); And / or, the agricultural machinery speed change system further includes an electronic handbrake connected to the gearbox (1), and the shift driving mechanism is arranged above the electronic handbrake.

7. The agricultural machinery speed change system according to claim 1, characterized in that, The shift driving mechanism further includes a first bolt assembly that penetrates and fixes the fixed structure (11) and the outer wall of the box body, a first pin (7) that penetrates and hinges the fixed structure (11) and the electric telescopic device, a second bolt assembly that penetrates and fixes the connection structure and the outer end of the shift lever, and a second pin that penetrates and hinges the connection structure and the outer end of the telescopic rod.

8. The agricultural machinery speed change system according to claim 1, characterized in that, The agricultural machinery speed change system further includes: A hydraulic motor (3) for driving the power input shaft of the gearbox (1) to rotate, and including a first pressure measurement port and a second pressure measurement port; An on-off valve (2) including an on-off first oil port and a second oil port, the first oil port is connected to the first pressure measurement port through a pipeline, the second oil port is connected to the second pressure measurement port through a pipeline, and the on-off valve (2) can conduct the first oil port and the second oil port when the speed change transmission mechanism shifts gears.

9. The agricultural machinery speed change system according to claim 1, characterized in that, The agricultural machinery speed change system includes: A shift trigger mechanism including a plurality of gear trigger keys corresponding to the plurality of gears of the speed change transmission mechanism one by one, and each of the gear trigger keys is used to generate a gear trigger command corresponding to the gear; A processing device communicating with the shift trigger mechanism and the plurality of electric telescopic devices, and configured to be able to control the plurality of electric telescopic devices to cooperate according to the received gear trigger command so that the speed change transmission mechanism is shifted into the corresponding gear.

10. An agricultural machine, characterized in that, Including the agricultural machinery speed change system according to any one of claims 1 to 9.

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