JP2009022285A - Combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent increase of oil pressure beyond need caused by abnormal stop or the like of an implement HST 16 for driving a pre-processing unit 17 in a combine. <P>SOLUTION: Pressure for stopping an engine 1 is brought to be smaller than pressure for passing through a detour route of positive rotation by installing a positive rotation regulation valve 72 for permitting pressurized oil to pass through, when the oil pressure exceeds the pressure for passing through the detour route of positive rotation, to the detour route of positive rotation for returning the pressurized oil to an oil pressure pump 16P with bypassing an oil pressure motor 16M, while installing an oil pressure sensor 73 for detecting the oil pressure in an oil pressure passage from the oil pressure pump 16P to the oil pressure motor 16M and an engine-stopping means for stopping the engine 1 depending on information from the oil pressure sensor 73, in the oil pressure passage of the implement HST 16 for driving the pre-processing unit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hydraulic continuously variable transmission in a combine equipped with a hydraulic continuously variable transmission in a pre-processing transmission system to a pre-processing unit including grain haul conveyance.

  Conventionally, a combiner having a hydraulic continuously variable transmission (HST) in a pre-processing transmission system to a pre-processing unit including a grain feeder is known, and the HST is a pair of variable displacement hydraulics connected in a closed circuit. A pump and a hydraulic motor are provided. Then, the HST is shifted in correspondence with the traveling speed, and the operation speed of the preprocessing unit is synchronized with the traveling speed.

  However, the hydraulic motor is stopped (locked) at the time of an abnormal stop due to a straw clogging or the like in the preprocessing unit, and the hydraulic pressure rises, causing the hydraulic pressure to be higher than the normal hydraulic pressure.

  In order to solve the above problems, the present invention branches the output from the engine (1) into a traveling transmission system and a preprocessing transmission system to the preprocessing unit (17) including the cereal conveyance, and travels to the traveling transmission system. A traveling HST (4), which is a hydraulic transmission device for the vehicle, and a working machine HST (16), which is a hydraulic transmission device for driving the pretreatment unit, are provided in the pretreatment transmission system, respectively. The working machine HST (16) is a variable displacement type. Of the working machine HST (16) in a combine that includes a hydraulic pump (16P) and a hydraulic motor (16M), and provided with speed interlocking means for changing the driving speed of the working machine HST (16) in conjunction with the traveling speed. In the hydraulic path, the pressure oil from the hydraulic pump (16P) that normally rotates the hydraulic motor (16M) to the hydraulic motor (16M) side is returned to the hydraulic pump (16P) side by bypassing the hydraulic motor (16M). Establish a detour route If the oil pressure of the forward rotation pressure oil that normally rotates the hydraulic motor (16M) is smaller than the preset forward rotation bypass path passage pressure in the forward rotation bypass path, the forward rotation bypass path is closed and the forward rotation pressure is set. While restricting the passage of oil in the forward bypass path, when the hydraulic pressure of the forward pressure oil exceeds the forward bypass path passage pressure, the forward bypass path is opened to allow the forward pressurized oil to pass through the forward bypass path. A forward rotation regulating valve (72) is provided, and a hydraulic pressure sensor (73) for detecting the hydraulic pressure of the forward rotation pressure oil is further provided in a hydraulic path from the hydraulic pump (16P) of the normal rotation pressure oil to the hydraulic motor (16M). An engine stop means is provided for stopping the engine (1) when the oil pressure of the forward rotation pressure oil exceeds a predetermined pressure based on information from the oil pressure sensor (73), and the engine stop pressure is passed through the forward bypass path. Characterized by setting smaller than pressure It is.

According to the first aspect of the present invention, it is possible to prevent the oil pressure of the normal rotation pressure oil from increasing more than necessary due to the abnormal stop of the pretreatment unit 17 and the like, and shorten the life of the hydraulic equipment such as the work machine HST16. And damage to the hydraulic equipment is prevented.
Further, the engine stop pressure is set to be smaller than the forward bypass path passage pressure, and when the hydraulic motor 16M is locked, the engine 1 is first stopped by the engine stop function, but when the engine stop function does not operate due to a failure or the like, A forward rotation restricting function for restricting the forward rotation of the hydraulic motor 16M via the detour path 66 and stopping the operation of the work machine HST16 is activated.
That is, the engine 1 is stopped by the engine stop function or the output of the work machine HST 16 is stopped by the forward rotation restricting function, and the preprocessing unit 17 and the hydraulic equipment are not easily damaged.

  FIG. 1 is a transmission system diagram of a combine that employs a cereal conveying power transmission device in a combine according to the present invention. Two pulleys 2 and 3 for taking out an output are attached to a drive shaft (output shaft) 1a of an engine 1. Yes. The driving force from the engine 1 is transmitted through the pulley 2 to the traveling HST4, which is a hydraulic transmission device for traveling as a traveling transmission system, and the handling cylinder 6 is transmitted through the pulley 3 to the barrel 6 as a work machine transmission system. The output is branched to the trunk input shaft 7.

  The driving force for the left and right traveling devices is shifted and output from the transmission (traveling transmission) 8 for traveling transmission provided with the traveling HST 4, whereby the left and right traveling devices are driven with a variable speed, and the vehicle body is shifted at a variable speed. It has a structure.

  On the other hand, a driving force transmission belt 11 is wound between a pulley 3 on the engine 1 side and a pulley 9 attached to the barrel input shaft 7, and a tension clutch is disposed on the belt 11 side as a threshing clutch. 12 is provided. That is, the driving force is transmitted from the engine 1 to the work machine transmission system via the threshing clutch 12 so as to be freely connected and disconnected.

  The driving force of the work machine transmission system that is input to the handling cylinder input shaft 7 via the threshing clutch 12 is transmitted through the pulley 13 attached to the handling cylinder input shaft 7 (work machine transmission). 14 is transmitted to a work machine HST16 (input pulley 15 of the work machine HST16), which is a hydraulic power transmission device provided in 14, and is transmitted from the work machine transmission 14 to the pretreatment unit 17 in the combine and to the threshing feed chain 18. The transmission system of is branched and output.

  At this time, the work machine transmission 14 has two output shafts, a preprocessing output shaft 19 for driving force output to the preprocessing portion 17 and a feed chain output shaft 21 for driving force output to the threshing feed chain 18. The threshing feed chain 18 is driven by a sprocket 22 provided on the end side of the feed chain output shaft 21. The handling cylinder 6 is driven by a driving force input directly from the handling cylinder input shaft 7 via the bevel gear 23 (without the transmission).

  In other words, the work machine transmission system includes a transmission system to the threshing unit 24 (transmission of driving force to the barrel 6 and the threshing feed chain 18), and the transmission of driving force to the threshing unit 24 is driven to the work machine transmission 14. Along with the transmission of force, the threshing clutch 12 provided on the upstream side of the transmission to the work machine transmission 14 in the work machine transmission system is connected and disconnected.

  On the other hand, the pre-processing unit 17 includes a cereal reaping device (cutter) 41, a pulling device 42, a cereal conveying device such as a star wheel and a handling depth conveying body 43, and the like. For transmission, a belt 29 for transmission wound around a pulley 27 attached to the input shaft 26 of the driving force on the preprocessing unit 17 side and a pulley 28 attached to the preprocessing output shaft 19 is used. Done through.

  The pre-processing unit 17 has a structure in which each of the mechanisms is driven at a driving speed corresponding to the rotational speed (speed) of the driving force by the driving force input to the input shaft 26 as in the prior art. On the belt 29 side, a tension clutch for connecting / disconnecting transmission of driving force to the preprocessing unit 17 (input shaft 26) is provided as a preprocessing clutch 31.

  As described above, in the “disengaged” state of the pretreatment clutch 31, by operating the “threshing” clutch 12, driving force is input from the engine 1 to the barrel input shaft 7, and the pretreatment unit 17 remains stopped. Then, the barrel 6 and the threshing feed chain 18 are driven, and the pretreatment clutch 31 is further “engaged” to drive the driving force to the pretreatment portion 17 and the pretreatment portion 17 (each of the above mechanisms) is driven. The

  At this time, the work implement transmission 14 is configured integrally with the work implement HST16 as shown in FIGS. 2 and 3, and is structured to be shifted by the work implement HST16. The preprocessing output shaft 19 and the feed chain output shaft 21 are provided downstream (downstream) from the work machine HST16.

  That is, the work machine transmission 14 is supported by the preprocessing output shaft 19 while the gear G1 supported by the output shaft 16a of the work machine HST16 meshes with the gear G2 supported by the preprocessing output shaft 19. The gear G3 and the gear G4, which is rotatably supported by the output shaft 16a, are meshed with each other. The sprocket P1 and the feed chain output shaft, which are rotatably supported by the output shaft 16a and rotate together with the gear G4. 21 has a structure in which a sprocket P2 that is pivotally supported so as to rotate integrally with the shaft 21 is connected by transmission via a chain C.

  At this time, a torque limiter mechanism 20 is interposed between the feed chain output shaft 21 and the sprocket P2. As a result, the driving forces from the preprocessing output shaft 19 and the feed chain output shaft 21 are both shifted from the work machine HST16, that is, the drive speeds of the feed chain 18 and the preprocessing unit 17 are shifted in synchronization by the work machine HST16.

  In addition, since the driving force to the handling cylinder input shaft 7 is cut by operating the threshing clutch 12 to “cut”, none of the pretreatment unit 17, the handling cylinder 6, and the threshing feed chain 18 are stopped and driven. Further, when a high load (clogging or the like) is applied to the feed chain 18 side, the torque limiter mechanism 20 cuts off the drive of the feed chain output shaft 21 from the work machine HST16 side, preventing overload to the work machine HST16 side. The

  On the other hand, a driving force is input to the traveling HST 4 from the engine 1 side to the traveling HST 4, and the driving force changed by the traveling HST 4 is sub-shifted via the sub-transmission mechanism 32 provided on the traveling transmission 8 side. And output to the traveling device side.

  In other words, the main transmission lever 33 that operates the traveling HST4 to shift the output from the traveling HST4 and the auxiliary transmission lever (not shown) that operates the auxiliary transmission mechanism 32 are attached to the traveling transmission 8 side. The travel driving force toward the travel device is shifted by operating the lever 33 and the sub-shift lever, and the travel speed of the aircraft is changed.

  At this time, the sub-transmission mechanism 32 is attached with a sub-transmission output shaft 34 that outputs a sub-shifted driving force (driving force after a shifting operation), and a traveling rotation sensor 36 is attached to the sub-transmission output shaft 34. The rotation speed (traveling speed) of the auxiliary transmission output shaft 34 can be detected. The preprocessing output shaft 19 of the work machine transmission 14 is provided with a preprocessing rotation sensor 37 that detects the rotational speed of the preprocessing output shaft 19 (driving speed of the preprocessing unit 17).

  Further, on the side of the shift trunnion shaft (not shown) of the work machine HST16, as shown in FIG. 1, the trunnion shaft (swash plate angle of the work machine HST16) is operated to change the speed of the work machine HST16. An actuator (motor) 39 is integrally attached to the work machine HST16. Further, as shown in FIG. 4, both the rotation sensors 36 and 37 are input to the microcomputer unit 38 which is a control device, and a motor 39 is connected to the output side of the microcomputer unit 38.

  The microcomputer unit 38 controls the motor 39 based on the information from the both rotation sensors 36 and 37, and the preprocessing unit 17 (preprocessing output shaft 19) and the threshing feed chain 18 (feed chain output shaft 21). The driving speed is synchronized, and the driving speed of the pre-processing unit 17 is automatically shifted in association with (synchronized with) the traveling speed.

  This means that during work traveling, the amount of harvested cereal per unit time is increased or decreased corresponding to the traveling speed, and the amount of cereal to be processed by the preprocessing unit 17 per predetermined unit time changes. Therefore, it is necessary to change the driving speed of the pre-processing unit 17 (the cutter 41, the pulling device 42, the handling depth conveyance body 43, etc.) according to the traveling speed (synchronized).

  Therefore, the microcomputer unit 38 uses the traveling speed information from the traveling rotation sensor 36 to send information from the preprocessing rotation sensor 37 so as to drive the preprocessing unit 17 at a driving speed that secures a processing amount corresponding to the traveling speed. The shift of the work implement HST16 is monitored and controlled by the motor 39, and the drive speed of the preprocessing unit 17 is changed in conjunction with the travel speed as shown in the graph of FIG. That is, the speed interlocking means for changing the driving speed of the preprocessing unit 17 in conjunction with the traveling speed includes a motor 39, a microcomputer unit 38, a preprocessing rotation sensor 37, a traveling rotation sensor 36, and the like.

  As shown in FIG. 5, the microcomputer unit 38 (speed interlocking unit) sets the driving speed of the preprocessing in proportion to the traveling speed when the traveling speed is equal to or higher than a predetermined low speed (speed maintenance control start speed) V1. When the traveling speed becomes lower than the speed maintenance control start speed V1 (including 0) and when the vehicle travels backward, the drive of the pre-processing unit 17 is maintained while maintaining a predetermined low speed (maintenance speed) V2. It is configured.

  The speed interlocking unit is configured to continue driving the pre-processing unit 17 at the maintenance speed V2 when the traveling speed becomes lower than the speed maintenance control start speed V1 as described above. You may set so that it may be substantially 0 or 0. The maintenance speed V2 is a speed at which the combine can perform the cutting and conveying work.

  The work machine transmission 14 is driven by the preprocessing output shaft 19 and the feed chain output shaft 21 so that the feed chain 18 is driven at a predetermined speed ratio with respect to the driving speed of the preprocessing unit 17 by the above-described structure. Force (speed) ratio is set.

  With the above structure, the output rotation direction of work implement HST16 may be only in one direction (forward rotation), that is, the above mechanism can be realized only by forward shifting, and reverse rotation is unnecessary. Rather, since the pre-processing unit 17 and the feed chain 18 operate in the reverse direction due to the reverse rotation of the work implement HST16, it is necessary to prevent this, that is, the reverse rotation of the work implement HST16 needs to be restricted.

  For this reason, the work machine HST16 has a structure as shown below, and is regulated such as reverse rotation. That is, as shown in FIG. 6, the work machine HST16 includes a variable displacement hydraulic pump 16P that is driven to rotate by a driving force from the engine 1, and a hydraulic motor connected to the hydraulic pump 16P in a closed circuit. 16M and a charge pump 16C for replenishing oil in the closed circuit, and the charge pump 16C is configured to be driven integrally with the hydraulic pump 16P.

  Further, in the closed circuit, the forward or reverse pressure oil from the hydraulic pump 16P for rotating the hydraulic motor 16M forward or backward to the hydraulic motor 16M side bypasses the hydraulic motor 16M and the hydraulic pump 16P side (hydraulic pump) A detour path 66 is provided to return to the input side of 16P, and the detour path 66 is configured to feed a normal rotation pressure oil from the hydraulic pump 16P to the hydraulic motor 16M, and a reverse pressure oil is hydraulically supplied. It is provided between the reverse path pipe 68 that feeds oil from the pump 16P to the hydraulic motor 16M side.

  When the normal pressure pressure oil is fed from the hydraulic pump 16P to the hydraulic motor 16M via the normal rotation path pipe 67, the hydraulic motor 16M is normally rotated by the normal pressure oil, and the oil discharged from the hydraulic motor 16M is discharged. When the reverse pressure oil is returned from the hydraulic pump 16P to the hydraulic motor 16M via the reverse path pipe 68 and returned to the hydraulic pump 16P via the reverse path pipe 68, the hydraulic motor 16M is reversed by the reverse pressure oil. Thus, the drained oil from the hydraulic motor 16M is returned to the hydraulic pump 16P via the forward rotation path pipe 67, and the hydraulic motor 16M is driven to rotate as described above.

  On the other hand, in the detour path 66, a forward rotation restricting valve 72 is interposed between a reverse rotation detour path pipe 69 connected to the reverse path path pipe 68 and a forward rotation detour path pipe 71 connected to the forward rotation path pipe 67 side. The pressure oil is unconditionally fed from the reverse path pipe 68 side to the forward path pipe 67 side, and the pressure oil is supplied from the forward path pipe 67 side to the reverse path pipe 68 side. Only when the hydraulic pressure is exceeded, the forward rotation restricting valve 72 is configured to open and feed the pressurized oil.

  In other words, the forward rotation restricting valve 72 is a check and high pressure relief valve, and permits the feeding of pressure oil (reverse pressure oil) in one direction (from the reverse path pipe 68 side to the forward path pipe 67 side). Then, in the opposite direction (from the forward rotation path pipe 67 side to the reverse rotation path pipe 68 side), the oil pressure of the forward rotation pressure oil (forward rotation pressure oil) is the predetermined hydraulic pressure (passing through the forward rotation bypass path). The pressure is allowed only in the above case.

  The output of the charge pump 16C is connected to the reverse rotation bypass path pipe 69, so that replenishment oil can be fed from the charge pump 16C to the reverse path path 68 and forward rotation path pipe 67.

  When the hydraulic motor 16M is driven in the normal rotation direction by the above structure and the pretreatment unit 17 and the feed chain 18 are normally operated, the normal rotation pressure oil from the hydraulic pump 16P is normal as shown in FIG. Oil discharged from the hydraulic motor 16M, which is sent to the hydraulic motor 16M via the rotation path pipe 67 and driven to rotate forward, is returned to the hydraulic pump 16P via the reverse path path 68, and supplementary oil is supplied by the charge pump 16C. It is sent to the reverse path pipe 68 through the reverse bypass path pipe 69 and sent to the hydraulic pump 16P together with the oil drained.

  On the other hand, when the reverse pressure oil is erroneously sent from the hydraulic pump 16P to the hydraulic motor 16M via the reverse path pipe 68, the reverse rotation is sent through the reverse path pipe 68 as shown in FIG. The hydraulic oil is not fed to the hydraulic motor 16M side due to the resistance on the hydraulic motor 16M side when the hydraulic motor 16M is rotated, and passes from the reverse rotation bypass path pipe 69 to the forward rotation restriction valve 72 and the forward rotation bypass path pipe 71. Is sent to the forward path pipe 67 and returned to the hydraulic pump 16P via the forward path pipe 67.

  That is, the reverse pressure oil bypasses the hydraulic motor 16M via the bypass path 66 and is returned to the hydraulic pump 16P, and the reverse rotation oil does not reversely rotate the hydraulic motor 16M, and the reverse rotation restriction of the hydraulic motor 16M is performed. Is called. As a result, the reverse of the hydraulic motor 16M (work machine HST16) can be achieved with the above simple configuration without providing a one-way clutch or the like in the reverse rotation bypass path for returning the reverse pressure oil to the hydraulic pump 16P by bypassing the hydraulic motor 16M. Rotation can be regulated. Further, since work machine HST16 is restricted from reverse rotation in any situation, work machine HST16 can be easily stopped (output is 0).

  On the other hand, the hydraulic motor 16M is stopped (locked) at the time of an abnormal stop due to a straw clogging of the pretreatment unit 17 or the feed chain 18, and the hydraulic pressure of the normal rotation pressure oil in the normal rotation path pipe 67 rises. The abnormal pressure is higher than the oil pressure of the normal rotation pressure oil (when the pretreatment unit 17 and the feed chain 18 are operated).

  For this reason, in the present embodiment, the above-mentioned forward rotation bypass path passage pressure is set to be substantially the same value as the abnormal pressure, whereby the forward rotation regulating valve 72 functions as a torque limiter, and the preprocessing unit 17 When the feed chain 18 stops abnormally, the forward rotation restricting valve 72 is opened as shown in FIG. 7B, and the forward rotation pressure oil fed through the forward rotation path pipe 67 is locked by the hydraulic motor 16M. As a result, the normal rotation bypass path pipe 71 is sent to the forward rotation restriction valve 72, the forward rotation restriction valve 72 is opened, and the reverse rotation bypass path pipe 69 is sent to the reverse rotation path pipe 68, bypassing the hydraulic motor 16M. Returning to the hydraulic pump 16P, the forward rotation of the hydraulic motor 16M is stopped.

  As described above, the bypass path 66 bypasses the hydraulic motor 16M from the reverse path pipe 68 to the forward path pipe 67 and always returns the hydraulic motor 16M to the input side of the hydraulic pump 16P unconditionally, and reverses the hydraulic motor 16M. When the reverse rotation bypass path that restricts rotation and the forward rotation pressure oil bypasses the hydraulic motor 16M from the forward rotation path pipe 67 to the reverse rotation path pipe 68 and the hydraulic pressure of the forward rotation pressure oil exceeds the forward rotation bypass path passage pressure. It returns to the input side of the hydraulic pump 16P, and also serves as a forward rotation bypass path that restricts the forward rotation of the hydraulic motor 16M.

  That is, in the present embodiment, it is not necessary to drive the hydraulic motor 16M in the reverse direction, so that the reverse pressure oil passes through the reverse bypass path only when the hydraulic pressure of the reverse pressure oil exceeds a predetermined pressure in the bypass path 66 (reverse bypass path). Is not required, and the reverse rotation restricting valve for returning the reverse pressure oil to the input side of the hydraulic pump 16P by bypassing the hydraulic motor 16M, the one-way clutch, etc. are not required, and the reverse bypass path is the reverse bypass path pipe 69, etc. The structure of the working machine HST16 can be simplified.

  Further, since the reverse rotation of the hydraulic motor 16M is always unconditionally restricted, the reverse rotation of the hydraulic motor 16M can be reliably restricted. On the other hand, since the forward rotation restricting valve 72 functions as a torque limiter as described above, the drive of the preprocessing unit 17 and the like is stopped when the preprocessing unit 17 and the like are abnormally stopped. In addition to preventing breakage, it is also possible to easily remove clogged straws of the pretreatment unit 17 and the feed chain 18.

  On the other hand, the control of the microcomputer unit 38 is provided with engine stop means (function) for urgently stopping the operation of the engine 1, and the forward path pipe is connected to the input side of the microcomputer unit 38 as shown in FIG. A pressure sensor (hydraulic sensor) 73 that is provided on the 67 side and detects the oil pressure of the normal rotation pressure oil is connected, and the engine stop means uses the information from the oil pressure sensor 73 to change the oil pressure of the normal rotation pressure oil to a predetermined engine stop pressure. The engine 1 is configured to be stopped when exceeding the above.

  As a result, the hydraulic pressure of the normal rotation pressure oil is prevented from increasing more than necessary due to abnormal stoppage of the pretreatment unit 17 and the feed chain 18, and the life of the hydraulic equipment such as the work machine HST16 is shortened. It is prevented that the device is damaged. The engine stop pressure is set to be smaller than the forward bypass path passage pressure. When the hydraulic motor 16M is locked, the engine 1 is first stopped by the engine stop function. However, when the engine stop function is not activated due to a failure or the like, the engine stop pressure is bypassed. A forward rotation restricting function for restricting forward rotation of the hydraulic motor 16M via the path 66 and stopping the operation of the work machine HST16 is activated.

  That is, the engine 1 is stopped by the engine stop function, or the output of the work machine HST 16 is stopped by the forward rotation restricting function, and the preprocessing unit 17, the feed chain 18 side, or the hydraulic equipment is not easily damaged. In some cases, only one of the engine stop function and the forward rotation restricting function on the work machine HST 16 side may be provided.

  With the structure shown above, the driving speed of the pre-processing unit 17 is changed in sync with the traveling speed (following), and the corn harvester is smoothly cut and conveyed to the downstream side according to the traveling speed, Further, the feed chain 18 changes the drive speed following the change in the drive speed of the pretreatment unit 17, and the cereals that are conveyed by the treatment depth conveyance body 43 of the pretreatment unit 17 are smoothly transferred to the joint handling cylinder 6 side. Can be transported.

  At this time, the pre-processing unit 17 side and the feed chain 18 side are driven by the same transmission (work machine transmission 14), and the driving speed is always synchronized. Etc. are prevented.

  On the other hand, since the work machine transmission 14 is configured using the work machine HST 16, a common work machine HST 16 is disposed on the input side of the pretreatment unit 17 and the threshing feed chain 18, and the work machine transmission 14 side In addition to the compact structure, not only the traveling device, but also the pre-processing unit 17 and the threshing feed chain 18 are steplessly shifted, so that the cereal conveyance disturbance caused by the relationship with the traveling speed and the relationship with the amount of cutting is avoided. It can be prevented smoothly.

  In addition, the driving force of the pretreatment unit 17 and the threshing feed chain 18 is synchronously output from the work machine transmission 14 disposed on the downstream side of the threshing clutch 12, and the driving force of the handling cylinder 6 is also downstream of the threshing clutch 12. Therefore, by setting the threshing clutch 12 to the “cut” state, the pretreatment unit 17, the threshing feed chain 18, the handling cylinder 6, etc. are stopped, and the pretreatment unit 17 is turned off when the threshing unit 24 is stopped. A check device for stopping or not driving is unnecessary, and the structure can be simplified.

  On the other hand, since the pretreatment clutch 31 is disposed on the transmission downstream side of the work machine transmission 14 (between the pretreatment output shaft 19 of the work machine transmission 14 and the input shaft 26 of the pretreatment unit 17), the threshing clutch 12 is engaged. In the operating state, work implement HST16 is in a driving (rotating) state.

  For this reason, when the pre-processing clutch 31 is “ON”, the hydraulic pump 16P for rotating the hydraulic motor 16M is already inputted by the rotational driving force in the work machine HST16, and the charge pump 16C (hydraulic pump 16P) is rotated together with the hydraulic pump 16P. And a hydraulic pump 16M for replenishing oil leaking between the hydraulic motor 16M.

  As a result, the load on the charge pump 16C side when the pre-processing clutch 31 is engaged is small, no high pressure is generated in the charge pump 16C, and the charge pump 16C is already rotating, preventing troubles such as piston seizure. The durability of the hydraulic equipment (HST) is also improved.

  In the case of the present embodiment, both the traveling transmission 8 and the work machine transmission 14 use HST as a transmission, and the HST (work machine HST 16) is controlled by electronic control so that the work machine transmission 14 is automatically controlled. Because of the structure to change the speed, the followability to the traveling speed of the speed interlocking means is high, and the traveling speed and the pre-processing unit even when a change in volumetric efficiency due to oil temperature, pressure, etc. occurs in the traveling HST4 or the working machine HST16. The drive speed of 17 synchronizes accurately.

  Further, the control of the microcomputer unit 38 includes a driving speed maintaining means (function) for continuing the driving of the pre-processing unit 17 while maintaining the speed V2 when the traveling speed is equal to or lower than the predetermined low speed V1 as described above. Since it is provided, for example, when the cutting operation is performed to the vicinity of the headland, and the vehicle is stopped or moved backward by the main speed change (traveling HST4), the drive speed maintaining function drives the preprocessing unit 17, the feed chain 18, and the handling cylinder 6. Will continue.

  That is, the speed maintaining function also includes a function of a reverse speed maintaining means for continuing the driving of the pre-processing unit 17 while maintaining the speed V2 even when the aircraft is moving backward, as described above, thereby cutting the cereals. It is possible to prevent leftovers and leftovers from being transported, and to prevent spilling and turbulence of cereals such as spills. In addition, the driving speed of the pre-processing unit 17 is reduced more than necessary, so that inconveniences such as pulling out and pushing out of stocks due to insufficient mowing work are prevented.

  On the other hand, the control of the microcomputer unit 38 is provided with speed maintenance canceling means (function) for stopping (cancelling) the driving speed maintenance function, and serves as switching means, as shown in FIG. It is configured so that the operation and non-operation of the speed maintenance cancel function (actuation of the drive speed maintenance function) can be set by the operation (ON, OFF) of the forced scraping release switch 53 connected to the input side. .

  That is, when the forced scraping release switch 53 is turned on (on), the speed maintenance cancel function is activated, and the traveling speed is zero or a predetermined low speed (nearly zero) as shown in the graph of FIG. Stop speed) When V3 or less and the reverse state, the pre-processing unit 17 and the threshing feed chain 18 can be stopped with the work machine HST16 as neutral.

  As a result, during normal mowing and threshing work (row cutting), the forced scraping release switch 53 is turned on to operate the speed maintenance canceling function, and when the traveling speed is 0 or the near-stop speed V3 or less and the reverse traveling state, the preprocessing unit 17 and By stopping the threshing feed chain 18, for example, when threshing clogging occurs and the handling cylinder 6 is stopped, the pretreatment unit 17 and the threshing feed chain 18 are stopped by stopping the machine body, Clogging can be easily removed.

  In addition, since the pre-processing unit 17 and the threshing feed chain 18 are stopped, waste or the like is not discharged to the rear side of the fuselage when turning around, for example, at the time of turning. Inconvenience is prevented. Further, it is possible to prevent the uncut shears from being scraped unnecessarily.

  On the other hand, the above-described pre-processing unit 17 can be moved up and down as in the prior art, and a pre-processing height potentiometer 44 for detecting the height of the pre-processing unit 17 is attached to the pre-processing unit 17 side. As shown, information from the potentiometer 44 is input to the microcomputer unit 38.

  The microcomputer unit 38 operates the work implement HST16 by the motor 39 to output the work implement HST16 when the pre-processing unit 17 is raised to a predetermined set height by the information from the potentiometer 44. 0, automatic stop means (function) for stopping the driving of the pretreatment unit 17 and the threshing feed chain 18 is provided.

  Thus, for example, when the pretreatment unit 17 is raised during turning, for example, when turning, the automatic stop function is activated by raising the pretreatment unit 17 to a predetermined height, and the pretreatment unit 17 and the threshing feed chain 18 are Since driving is stopped, drainage or the like is not discharged. For this reason, a straw or the like is not dropped at the turning place, and inconveniences such as the aircraft stepping on the straw when turning are prevented. At this time, as described above, the driving of the pre-processing unit 17 and the threshing feed chain 18 is stopped in synchronization, so that the conveyance disturbance and clogging of the cereals are prevented.

  When the preprocessing unit 17 is lowered from the raised state, the automatic stop function is canceled and the microcomputer unit 38 activates the motor 39 to lower the preprocessing unit 17 and the threshing feed again. The chain 18 is driven in synchronism with the traveling speed, and cutting, conveyance, and the like are resumed.

  Further, as shown in FIG. 4, a lift shut release switch 46 is also input to the microcomputer unit 38. When the lift shut release switch 46 is ON, the operation of the automatic stop function is stopped. When the lift shut release switch 46 is ON, the pretreatment unit 17 and the threshing feed chain 18 continue to be driven even if the pretreatment unit 17 is raised to the set height.

  However, on the side of the microcomputer unit 38, a main sensor 47 on the handling depth carrier 43 side that senses whether or not wrinkles are contained in the pre-processing unit 17 is also input, and the main sensor 47 moves toward the microcomputer unit 38 side. According to the information, even when the lift shut release switch 46 is ON, a drive stopping means (function) is provided to stop the driving of the preprocessing unit 17 and the threshing feed chain 18 when the preprocessing unit 17 finishes pouring the straw. Yes.

  That is, when the microcomputer unit 38 detects that the main sensor 47 is turned off after the pre-processing unit 17 is lifted by the drive stop function and the soot is finished, the motor 39 is driven to set the output of the work machine HST16 to zero. The drive of the pre-processing part 17 and the threshing feed chain 18 is stopped, and the drive beyond necessity is prevented.

  On the other hand, a main clutch 51 is provided between the pulley 2 and the input pulley 48 of the traveling HST, and the transmission of the driving force to the traveling device side (traveling transmission system) is cut off by operating the main clutch 51 to be cut off. It is possible to stop the aircraft.

  At this time, a sensor (safety switch) 52 for detecting a depression of the clutch pedal (disengagement operation of the main clutch 51) is provided on the side of the traveling clutch pedal that operates the main clutch 51. Information is input to the microcomputer unit 38. In the microcomputer unit 38, the motor 39 is driven by turning on the safety switch 52 (when the clutch pedal is depressed), the output of the work machine HST16 is set to 0 (neutral), and the preprocessing unit 17 and the threshing feed chain 18 are driven. An operation stop means (function) for stopping the operation is also provided.

  When the clutch pedal is depressed, the main transmission lever 33 is also forcibly returned to neutral, and the output of the traveling HST4 is also switched to 0 (neutral). As a result, the operator can depress the travel clutch pedal and disengage the main clutch 51 to urgently stop the airframe, so that the emergency stop operation is easy and the emergency stop can be surely performed.

  By the way, it is necessary to raise the drive speed of the pre-processing part 17 on the performance of the mowing in the state where the uncut grain cocoon is lying down. That is, in the case of this combine, the proportional coefficient of the driving speed of the preprocessing unit 17 with respect to the traveling speed is increased, and the driving speed of the preprocessing unit 17 set by the speed interlocking unit is increased with respect to the traveling speed as described above. There is a need.

  For this reason, in the present embodiment, the microcomputer unit 38 is provided with speed increasing means (function) for increasing the driving speed of the preprocessing unit 17 with respect to the traveling speed. The microcomputer unit 38 is shown in FIG. As described above, the speed increasing function is set to be turned on and off by turning on / off the lodging switch 58 connected to the microcomputer unit 38.

  Thereby, when performing the harvesting and threshing operation of the fallen cedar by the combine of the present embodiment, the operator activates the speed increase function by manually turning on the fallen switch 58, as shown in FIG. Compared with the driving speed S1 similar to FIG. 5 (dotted line in FIG. 9), the preprocessing unit 17 is driven at a high speed S2 (solid line in FIG. 9) with respect to the traveling speed, thereby cutting down the fallen cereal straw. It can be carried out easily and stably. When the lodging switch 58 is turned OFF, the preprocessing unit 17 is driven at the speed of S1.

  In addition, the driving speed of the pretreatment unit 17 in which the cereals conveyed from the pretreatment unit 17 to the feed chain 18 are in an appropriate posture varies depending on the material conditions (such as the nap angle of rice and the rigidity of rice bran), the field conditions, etc. Thus, under any conditions, if the pre-processing unit 17 is driven at a preset driving speed (standard speed) by the speed interlocking means or the speed increasing function, the cereal conveyance such as the tip or the head of the stock will be disturbed. There is a case.

  In order to avoid this inconvenience, in this embodiment, the control of the microcomputer unit 38 is performed by changing the speed ratio of the driving speed of the preprocessing unit 17 with respect to the traveling speed (the proportional coefficient), and the driving speed of the preprocessing unit 17 is changed to the above. Speed change means (function) for changing the standard speed is provided, and the microcomputer unit 38 has a speed change function by switching a preprocessing speed change dial switch 59 connected to the microcomputer unit 38 as shown in FIG. It is configured to set on / off.

  At this time, the pre-processing speed change dial switch 59 has a plurality of switching positions as shown in FIG. 10, and by switching to each position, the standard speed is changed as shown in the graph of FIG. The drive speed is increased or decreased. That is, when the pre-processing speed change dial switch 59 is switched to position 1, it is driven with a proportional coefficient of 1 in FIG.

  As a result, when the driving speed of the pre-processing unit 17 is increased with respect to the traveling speed (standard speed), the tip is preceded, and when the driving speed is lowered, the stock is preceded (the tip is delayed). When the cereal conveyance disturbance occurs, the cereal conveyance disturbance can be corrected by switching the preprocessing speed change dial switch 59 to an appropriate position. Note that a variable resistance (volume or the like) may be used as the preprocessing speed change dial switch 59 so that the increase / decrease of the driving speed is set steplessly.

  Further, as shown in FIG. 4, a camera 61 is provided at the inherited portion of the feed chain 18 from the pre-processing unit 17, and is connected to the input side of the microcomputer unit 38. You may comprise so that the speed change function may be actuated and the grain posture may be automatically corrected by adjusting the drive speed of the preprocessing unit 17.

  When the combine of the present invention is used for handling work, the traveling speed becomes 0. Therefore, if the speed maintenance canceling function is activated (the forced scratch release switch 53 is turned on), the driving speed of the preprocessing unit is 0, If the speed maintenance canceling function is inactive (the forced scratch release switch 53 is OFF), the driving speed maintenance function is activated and the driving speed of the preprocessing unit becomes V2.

  That is, in the handling operation, the driving speed of the feed chain 18 becomes 0 or relatively low (V2), and the operation cannot be performed or deteriorates. In order to avoid this inconvenience, the microcomputer unit 38 of the present invention is provided with a handling speed increasing means (function), and the driving speed of the feed chain 18 during handling is increased by the handling speed increasing function. Thus, the handling operation can be efficiently performed.

  That is, the microcomputer unit 38 is connected with a hand switch 56 for detecting a hand handling state as shown in FIG. 4, and the microcomputer unit 38 is operated at a hand speed by turning the hand switch 56 on and off. It is configured to set the up / down function.

  By the way, in the present embodiment, as shown in FIG. 12, the feed chain 18 is held above the feed chain 18 as in the prior art, and a feed rail 62 that holds the grain straw together with the feed chain 18, and a feed at the front end 62 a of the straw rail 62. There is provided a grain presser foot 63 supported so as to be swingable up and down with respect to the chain 18, and the grain presser foot 63 has a handling work position H for raising the feed chain 18, and a feed The posture can be freely switched to the normal work position A where the front end of the chain 18 is laid down.

  In the case of the present embodiment, the handle switch 56 is provided on the heel rail 62 side, and when the culm presser foot 63 is switched to the standing posture (hand-operated work position H), the culm presser foot 63 The support unit 64 is turned on, and the microcomputer unit 38 enters and operates the hand speed increasing function.

  Further, an actuator (preprocessing clutch motor) for operating on / off of the preprocessing clutch 31 is provided on the preprocessing clutch 31 side, connected to the output side of the microcomputer unit 38 as shown in FIG. The preprocessing clutch motor 57 is driven so that the preprocessing clutch 31 can be automatically turned on and off in addition to the manual operation described above.

  As a result, when the grain handle presser 63 is switched to the handling position H and the handling switch 56 is turned on, the microcomputer unit 38 activates the handling speed increasing function, as shown in FIG. The driving speed of the pre-processing unit 17 when the traveling speed becomes equal to or lower than the predetermined speed is increased from the maintenance speed V2 to the handling speed V4 at which the handling operation can be efficiently performed, and the pre-processing clutch motor 57 is driven to disengage the pretreatment clutch 31.

  In this case, the drive of the pre-processing unit 17 is stopped, and the feed chain 18 is driven at a speed corresponding to the preset handling maintenance speed V4. Thus, the handling operation can be performed efficiently without reducing the working efficiency during the handling operation.

  Note that the microcomputer unit 38 checks the ON / OFF of the handling switch 56 in addition to the ON / OFF of the forced scratch release switch 53 in response to the operation of the speed maintenance cancel function. In the case of ON, speed maintenance cancel restricting means (function) that does not operate the speed maintenance cancel function even if the forced scraping release switch 53 is ON is provided.

  As a result, during the handling operation, the handling switch 56 is turned on, so that the speed maintenance cancellation restriction function is activated and the speed maintenance cancellation function is activated (the forced scratch release switch 53 is on). However, the speed maintenance cancel function is automatically stopped, and the inconvenience that the driving speed of the feed chain 18 becomes 0 is automatically prevented.

It is a power transmission diagram of a combine. It is a plane sectional view of a work machine transmission. It is a front view of a work machine transmission. It is a block diagram of a microcomputer unit part. It is a graph which shows the relationship between driving speed and pre-processing drive speed. It is the hydraulic circuit which showed the flow of the pressure oil at the time of normal operation of the working machine HST. (A), (b) is the hydraulic circuit which showed the flow of the pressure oil when a reverse pressure oil is sent out from the hydraulic pump of the working machine HST, and when a hydraulic motor locks. It is a graph which shows the relationship between the travel speed of the state which act | operated the speed maintenance cancellation function, and pre-processing drive speed. It is a graph which shows the relationship between the travel speed of the state which actuated the speed increase function, and pre-processing drive speed. It is a top view of a pre-processing speed change dial switch. It is a graph which shows the relationship between the running speed at the time of operating a speed change function, and a pre-processing drive speed. It is a side view of the front-end part of a feed chain. It is a graph which shows the relationship between the running speed of the state which act | operated the handling speed raising function, and pre-processing drive speed.

Explanation of symbols

1 Engine 14 Work machine transmission (Pre-processing transmission)
16 Work implement HST (hydraulic continuously variable transmission)
16P Hydraulic pump 16M Hydraulic motor 17 Pre-processing section 72 Forward rotation regulating valve 73 Hydraulic sensor

Claims (1)

  The output from the engine (1) is branched into a traveling transmission system and a preprocessing transmission system to the preprocessing section (17) including the corn straw transport, and the traveling transmission system is a traveling HST (4 that is a hydraulic transmission device for traveling). ) Is provided with a working machine HST (16), which is a hydraulic transmission device for driving the pretreatment unit, in the pretreatment transmission system. The working machine HST (16) includes a variable displacement hydraulic pump (16P) and a hydraulic motor (16M). ) And provided with speed interlocking means for changing the driving speed of the work implement HST (16) in conjunction with the traveling speed, the hydraulic motor (16M) is connected to the hydraulic path of the work implement HST (16). A forward rotation bypass path is provided for returning the hydraulic oil from the rotating hydraulic pump (16P) to the hydraulic motor (16M) side to the hydraulic pump (16P) side by bypassing the hydraulic motor (16M), and in the forward rotation bypass path And hydraulic motor ( 6M), when the oil pressure of the forward rotation pressure oil for forward rotation is smaller than the preset forward rotation bypass path passage pressure, the forward rotation bypass path is closed and the passage of the forward rotation pressure oil through the forward rotation bypass path is restricted. On the other hand, when the hydraulic pressure of the normal rotation pressure oil exceeds the normal rotation detour path passage pressure, a normal rotation restriction valve (72) is provided that opens the normal rotation detour path and allows the normal rotation pressure oil to pass through the normal detour path. A hydraulic pressure sensor (73) for detecting the hydraulic pressure of the forward rotation pressure oil is provided in the hydraulic path from the hydraulic pump (16P) of the normal rotation pressure oil to the hydraulic motor (16M), and information from the hydraulic pressure sensor (73) is provided. Is provided with engine stop means for stopping the engine (1) when the hydraulic pressure of the forward rotation pressure oil exceeds a predetermined pressure, and the engine stop pressure is set smaller than the forward rotation bypass path passage pressure. .

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