WO2020218123A1

WO2020218123A1 - Work vehicle, harvesting machine, and work machine

Info

Publication number: WO2020218123A1
Application number: PCT/JP2020/016610
Authority: WO
Inventors: 松本健太; 戸田義之; 齊藤崇; タンチアユアン; 磯▲崎▼耕輝; 猿渡賢治; 丸山純一; 河合雄一郎
Original assignee: 株式会社クボタ
Priority date: 2019-04-24
Filing date: 2020-04-15
Publication date: 2020-10-29
Also published as: CN117751757A; CN113677193A; CN113677193B

Abstract

This work vehicle is provided with: a driving source capable of executing rotational driving; a work apparatus driven by the driving source; a transmission belt capable of transmitting power from the driving source to the work apparatus; a belt tension-type work clutch 23A switchable between a transmitting state in which power is transmitted to the transmission belt and a non-transmitting state in which power is not transmitted to the transmission belt; a clutch operation unit capable of carrying out an operation of switching the work clutch 23A between the transmitting state and the non-transmitting state on the basis of an engagement control signal which is a control signal relating to an engagement operation of the work clutch 23A and a disengagement control signal which is a control signal relating to a disengagement operation of the work clutch 23A; and a rotational speed detection sensor capable of detecting a rotational speed R of the driving source.

Description

Work platforms, harvesters, and work machines

The present invention relates to a work vehicle, a harvester, and a work machine.

[First background technology]
For example, Patent Document 1 discloses a work vehicle in which a work device (in the document, a "cutting section", a "threshing section", etc.) is driven by a drive source. A transmission belt (“belt” in the literature) is interposed between the drive source and the work device, and the transmission belt transmits the power of the drive source by the work clutch and does not transmit the power of the drive source. It is configured to be switchable to. When the transmission belt is switched to a state in which the power of the drive source is transmitted, the work clutch is operated after the rotation speed of the drive source is reduced. As a result, the slip of the transmission belt at the time of switching the transmission belt is reduced, and the transmission belt is protected.

[Second background technology]
Conventionally, as a harvester, for example, the harvester described in Patent Document 2 is known. The harvester described in Patent Document 2 is provided with a cutting section (“cutting section [3]” in the document) that cuts the planted crop while scraping it, and a scraping reel (“cutting section [3]” in the document) that scrapes the planted crop into the harvesting section. In the literature, a "scraping reel [12]") is provided. The scraping reel includes left and right reel frames (“reel frame [19]” in the literature) that are rotationally driven around a rotation axis (“axis center [X1]” in the literature) that extends along the left-right direction of the machine. A plurality of rod-shaped support members (“support frame [20]” in the literature) that are provided over the left and right reel frames and extend along the left-right direction of the machine, and a plurality of members that are attached to the support members at intervals in the left-right direction of the machine. Tyne (“Tyne [22]” in the literature) and is provided. The tine has a support portion supported by the support member (“mounting portion [35]” in the literature), a spring portion located below the support member (“coil portion [33]” in the literature), and a spring portion. It is provided in a hanging state and has an action part (“action part [32]” in the literature) that scrapes into the planted crop.

[Third background technology]
In a combine harvester, which is an example of a work machine on which an engine is mounted, a radiator for cooling an engine is conventionally supported by a support frame formed in a square frame shape so as to surround the outer periphery thereof. The support frame is fixed to the airframe frame by bolt connection or the like. For example, referring to the working machine disclosed in Patent Document 3, the dustproof case that closes the outside of the radiator body is supported so as to be swingable integrally with the engine bonnet, and the dustproof case and the engine bonnet are swinging outward. Then, the radiator is opened so that it faces the outside.

Japanese Patent Application Laid-Open No. 2005-178631 Japanese Patent Application Laid-Open No. 2013-110983 Japanese Patent Application Laid-Open No. 2017-200469

[First task]
By the way, as shown in Patent Document 1, in the configuration in which the rotation speed of the drive source is lowered when the work clutch switches the transmission belt, the operator actually performs the transmission belt switching operation first. There is a time lag until the switching of the transmission belt is completed. Therefore, depending on the length of this time lag, it is possible that the operator may feel uncomfortable. Therefore, an object of the present invention is to provide a work vehicle that has both protection of a transmission belt and comfort of operation by an operator.

[Second task]
In the harvester described in Patent Document 2, the tine acts on the planted crop from the front and the planted crop is scraped. At that time, the planted crop comes into contact with the spring portion from behind, and the crop tends to wrap around the spring portion. In view of the above situation, there is a demand for a harvester in which crops are less likely to wrap around the spring portion of the tine.

[Third task]
In this type of working machine disclosed in Patent Document 3, a worker may remove the radiator in order to remove dust adhering to the inside of the radiator body. Then, in the above-mentioned conventional configuration, when such a radiator removal work is performed, the dustproof case is opened, and then the connection between the support frame surrounding the outer circumference of the radiator and the airframe frame is released to obtain a large size. It was necessary to integrally remove the support frame and the radiator, which are the members of the above, to the outside, which was a troublesome work for the operator. Therefore, there has been a demand for improving workability when performing maintenance work on the radiator.

The work vehicle according to the present invention for solving the above-mentioned [first problem] can be driven by a rotationally driveable drive source, a work device driven by the drive source, and can transmit power from the drive source to the work device. A belt tension type work clutch that can be switched between a transmission belt, a transmission state in which power is transmitted to the transmission belt, and a non-transmission state in which power is not transmitted to the transmission belt, and a control signal relating to the engagement operation of the work clutch. A clutch operation unit capable of switching the work clutch between the transmission state and the non-transmission state based on the on-control signal, which is the on-control signal, and the off-control signal, which is the control signal related to the disengagement operation of the work clutch. When the clutch operating unit is provided with a rotation speed detection sensor capable of detecting the rotation speed of the drive source and the rotation speed is equal to or lower than a preset threshold value when the on-control signal is detected, the clutch is provided. When the operation unit immediately performs a transmission switching operation to bring the work clutch in the non-transmission state into the transmission state, and the rotation speed is higher than the threshold value when the clutch operation unit detects the ON control signal, The clutch operating unit controls the first rotation speed to lower the rotation speed of the drive source so that the rotation speed becomes equal to or lower than the threshold value, and switches the transmission in a state where the rotation speed becomes equal to or lower than the threshold value. It is characterized by performing an operation.

According to the present invention, when the rotation speed of the drive source is equal to or lower than a preset threshold value, the clutch operating unit immediately switches the work clutch to the transmission state, so that the operation of the work clutch does not have a time lag. The speed of operation of the work clutch is ensured. When the rotation speed of the drive source is higher than the threshold value, the clutch operating unit switches the work clutch to the transmission state after the rotation speed of the drive source is lowered below the threshold value, so that the transmission belt slips. Is firmly reduced. That is, according to the present invention, since the timing of the switching operation of the work clutch is adjusted according to the rotation speed of the drive source, a work vehicle in which the protection of the transmission belt and the comfort of the operator's operation are compatible is realized. Will be done. In the present invention, the meaning of "when the rotation speed is equal to or less than a preset threshold value" also includes the meaning of "when the rotation speed is lower than the preset threshold value". Further, in the meaning of "when the rotation speed is higher than the threshold value when the clutch operation unit detects the on-control signal", "the rotation speed when the clutch operation unit detects the on-control signal" Is greater than or equal to the threshold value. ” In addition, in the first rotation speed control of the present invention, in the sense of "decreasing the rotation speed of the drive source so that the rotation speed is equal to or less than the threshold value", "so that the rotation speed is less than the threshold value". It also includes the meaning of "lowering the rotation speed of the drive source". Further, the "rotational speed of the drive source" in the present invention may be the target rotation speed with respect to the drive source, or may be the rotation speed actually detected by the drive source.

In the present invention, when the transmission switching operation is completed in a state where the first rotation speed control is performed and the rotation speed is equal to or less than the threshold value, the rotation speed of the clutch operation unit becomes higher than the threshold value. As described above, it is preferable to perform the second rotation speed control for increasing the rotation speed of the drive source. Further, in the present invention, the accelerator operating tool for setting the rotation speed is provided, and the clutch operating unit controls the second rotation speed so that the rotation speed reaches the set rotation speed of the accelerator operating tool. It is suitable.

With this configuration, even if the rotation speed of the drive source is reduced, the rotation speed of the drive source is automatically increased after the switching operation of the work clutch is completed. Therefore, as compared with the configuration in which the operator manually increases the rotation speed of the drive source, the trouble for the operator is reduced and the operability of the work clutch is firmly secured. Further, the configuration in which the rotation speed of the drive source is increased to the set rotation speed of the accelerator operating tool after the switching operation of the work clutch is completed further reduces the trouble for the operator.

In the present invention, the first change rate, which is the rate of change of the rotation speed per unit time in the first rotation speed control, and the second rate of change, which is the change rate of the rotation speed per unit time in the second rotation speed control. The rate of change is set, and it is preferable that the first rate of change is smaller than the second rate of change. Further, in the present invention, it is preferable that the first rate of change is constant regardless of the number of rotations at the time when the clutch operating unit detects the ON control signal.

For example, when the drive source drives equipment other than the work equipment, the rotation speed of the drive source may suddenly decrease with the first rotation speed control due to the drive load of the equipment being applied to the drive source. Conceivable. In this case, if the operation of the drive source or the device is suddenly changed, the operator may be surprised or uncomfortable. In this configuration, since the first rate of change is smaller than the second rate of change, the number of revolutions when the number of revolutions of the drive source is decreased is larger than the change of the number of revolutions when the number of revolutions of the drive source is increased. It changes gradually. Therefore, even when a device other than the work device is being driven, there is no sudden change in the operation of the drive source or the device, and the possibility that the worker is surprised or uncomfortable is greatly reduced. Further, the configuration in which the first rate of change is constant regardless of the rotation speed of the drive source makes the operation change of the device more stable.

In the present invention, it is the first interval time, which is the time from the completion of the first rotation speed control to the start of the transmission switching operation, and the time from the completion of the transmission switching operation to the start of the second rotation speed control. The second interval time is set, and it is preferable that the second interval time is longer than the first interval time.

Immediately after the transmission belt is switched to the working state, it is possible that the transmission belt is slipping or vibrating. Therefore, it is desirable that a time for stably acclimatizing the transmission belt is secured between the completion of the transmission switching operation and the start of the second rotation speed control. On the other hand, from the viewpoint of operability of the work clutch, it is desirable that the switching operation by the clutch operation unit is performed as quickly as possible. In this configuration, since the second interval time is longer than the first interval time, it is possible to sufficiently acclimatize the transmission belt while the second interval time elapses. As a result, while the transmission belt is protected, the work clutch can be switched to the transmission state as quickly as possible without causing discomfort to the operator in waiting time.

In the present invention, a notification unit capable of notifying the transmission switching operation is provided, and the notification unit is preset from the time when the clutch operation unit detects the ON control signal and the start of the transmission switching operation. It is preferable to continue to notify the transmission switching operation when the set time has elapsed.

With this configuration, the notification unit notifies the operator of the state in which the clutch operating unit is switching the work clutch to the transmission state, so that the operator can recognize that the clutch operating unit is in the switching operation. .. As a result, even if the working clutch cannot be immediately switched to the transmission state when the clutch operating unit detects the on-control signal, there is a possibility that the operator may misunderstand it as a failure.

In the present invention, it is preferable that the set time is set before the completion of the transmission switching operation, and the notification unit stops the notification when the set time has elapsed.

When the clutch operation unit detects the ON control signal, the notification unit notifies the operator of the status of the switching operation of the clutch operation unit. Therefore, by configuring the notification to be stopped before the completion of the transmission switching operation, the notification by the notification unit does not have to be persistent, and the possibility of unpleasant notification for the operator is reduced.

The feature of the harvester according to the present invention for solving the above-mentioned [second problem] is that a harvesting section for cutting the planted crop is provided, and the harvesting reel for scraping the planted crop into the cutting section. The harvesting machine is provided with a plurality of left and right reel frames that are rotationally driven around a rotation axis extending along the left and right directions of the machine, and a plurality of the left and right reel frames. A rod-shaped support member extending along the left-right direction of the machine body and a plurality of tines attached to the support member at intervals in the left-right direction of the machine body are provided, and the tine is provided with a support portion supported by the support member. A spring portion located below the support member and an action portion provided in a state of hanging from the spring portion and squeezing into the planted crop are provided and fitted to the outer peripheral portion of the support member. A cover member having a fitting portion and a cover portion extending downward through the rear of the spring portion and covering the spring portion from the rear is provided.

According to this feature configuration, since the spring part is covered with the cover part from the rear, when the tine scrapes the planted crop, the planted crop does not come into contact with the spring part from the rear. Therefore, it is difficult for crops to wrap around the spring portion. Further, the cover member is attached to the support member in a state where the fitting portion is fitted to the outer peripheral portion of the support member. As a result, the cover member can be firmly attached to the support member.

Further, in the present invention, the support portion is fixed to the outer peripheral portion of the support member by a bolt, and the cover member is provided with a portion continuous with the fitting portion and covers the head of the bolt. It is preferable to have.

According to this feature configuration, the head of the bolt is covered by the part of the cover member that is continuous with the fitting part, so it is difficult for crops to wrap around the head of the bolt.

Further, in the present invention, the tine is formed in a shape that passes behind the support member to reach the spring portion, and the fitting portion is fitted to the front portion of the outer peripheral portion of the support member. It is preferable that the cover portion is extended downward so as to be in contact with the rear portion of the tine.

According to this feature configuration, the fitting portion can be successfully fitted to the outer peripheral portion of the support member while avoiding the tines passing behind the support member. Further, the cover portion is extended downward in a state of being in contact with the rear portion of the tine. As a result, the cover portion is firmly supported by the rear portion of the tine, and the gap between the cover portion and the rear portion of the tine is reduced to prevent crops that cause wrapping around the spring portion from entering through the gap. it can.

Further, in the present invention, it is preferable that the cover portion is extended downward to a height position below the lower end of the spring portion in a state of being in contact with the rear portion of the spring portion.

According to this feature configuration, the cover portion is firmly supported by the rear portion of the spring portion, and the gap between the cover portion and the rear portion of the spring portion is reduced so that crops that cause wrapping around the spring portion can enter through the gap. Can be effectively prevented. Further, the portion of the cover portion located below the lower end of the spring portion can protect the spring portion from crops that try to wrap around the spring portion from below.

Further, in the present invention, the cover portion is extended downward to a height position lower than the lower end of the fitting portion, and is below the lower end of the fitting portion in the cover portion. It is preferable that a support bracket for supporting the lower portion located on the side is provided.

According to this feature configuration, the portion of the cover member that is separated from the portion (fitting portion) attached to the support member (lower portion of the cover portion) can be firmly supported by the support bracket.

Further, in the present invention, it is preferable that the support portion is fixed to the outer peripheral portion of the support member by bolts, and the support bracket is fixed to the outer peripheral portion of the support member together with the support portion by the bolts. ..

According to this feature configuration, the fixed structure can be simplified by standardizing the bolts.

Further, in the present invention, the cover member is provided with a first engaging portion, and the support bracket is provided with a second engaging portion, the first engaging portion and the second engaging portion. It is preferable that the support bracket is fixed to the outer peripheral portion of the support member by the bolt in the engaged state.

According to this feature configuration, the cover member can be firmly attached to the support member via the support bracket so that the cover member does not come off from the support member.

Further, in the present invention, it is preferable that the support bracket is provided with a pressing portion that presses the fitting portion from the side opposite to the supporting member in a cross-sectional view of the supporting member.

According to this feature configuration, the fitting portion can be firmly held by the pressing portion so that the fitting portion does not come off from the outer peripheral portion of the support member.

Further, in the present invention, it is preferable that the cover member is a long member that covers a plurality of the tines, and the lower portions of the cover members on both the left and right sides are supported by the support brackets, respectively.

According to this feature configuration, the lower part of the cover can be supported in a well-balanced manner on the left and right.

Further, in the present invention, the tine has one support portion, left and right spring portions distributed to the left and right with respect to the one support portion, and left and right spring portions corresponding to each of the left and right spring portions. It is preferable that the working portion is provided.

According to this feature configuration, the support portion is shared between the left spring portion and the left acting portion and the right spring portion and the right acting portion. As a result, the number of parts related to the tine can be reduced, and the weight of the tine can be reduced.

Further, in the present invention, it is preferable that the support bracket for supporting the cover portion is attached to the support member between the left and right spring portions.

According to this feature configuration, the support bracket can be installed using the space between the left and right springs.

Further, in the present invention, it is preferable that the spring portion is located below the front of the support member, and the cover portion is inclined forward and downward along the rear portion of the spring portion in a side view.

According to this feature configuration, the cover portion is inclined along the rear portion of the support member and the rear portion of the spring portion. As a result, the gap between the cover portion and the rear portion of the spring portion can be reduced, and crops that cause wrapping around the spring portion can be prevented from entering through the gap.

The feature of the working machine according to the present invention for solving the above-mentioned [third problem] is that it covers the engine to form an engine room, supports the driver's seat from below, and faces laterally outward. An open engine bonnet, a radiator for cooling the engine provided on the lateral side of the engine in the engine room, and a radiator provided on the lateral side of the radiator to allow ventilation and prevent the passage of dust. A dustproof case that closes the lateral outside of the radiator, a cooling fan that is provided on the lateral inside of the radiator and draws outside air through the dustproof case to cool the radiator, and an intake space between the cooling fan and the radiator. A fan shroud that is provided so as to extend over the cooling fan and the radiator so as to surround the outer periphery of the radiator and guides outside air from the radiator to the cooling fan, and an opening formed on the lateral inside of the dustproof case and the radiator. A support frame for supporting the radiator is provided so as to extend over the radiator, and the radiator is supported by the support frame so as to be slidable rearward along the cooling surface, and is supported in the rear part of the engine room. The point is that an opening is formed in which the radiator can be removed and removed rearward.

According to the present invention, the operator slides the radiator rearward with respect to the support frame through the opening formed in the rear part of the engine room, and pulls out the radiator to the outside of the engine room through the opening. Can be removed. There is no need to remove the support frame, the operator only has to remove the radiator. Therefore, troublesome work such as removing both the support frame and the radiator to the outside is unnecessary. As a result, it is possible to improve workability when performing maintenance work on the radiator.

In the present invention, it is preferable that the fan shroud is configured so that it can be divided into a plurality of divided bodies in the circumferential direction.

According to this configuration, when removing the fan shroud with the radiator removal work, the operator can remove the fan shroud for each divided body. As a result, the work of removing the fan shroud becomes easier and the workability of the maintenance work is further improved as compared with the case where the entire fan shroud is integrally formed.

In the present invention, in the fan shroud, a part of the plurality of divided bodies is supported by the radiator, and the other divided body of the plurality of divided bodies is separated from the radiator. Is suitable.

According to this configuration, when attaching / detaching the fan shroud to / from the radiator, the operator only needs to attach / detach a part of the divided bodies to / from the radiator, and it is not necessary to attach / detach other divided bodies to / from the radiator, which is efficient. I can work well.

In the present invention, it is preferable that the part of the divided body is detachably supported by the radiator and can be detached rearward along the removing direction of the radiator.

According to this configuration, when removing the fan shroud, the operator divides the fan shroud into a part of the split body and another split body, and a part of the fan shroud is supported by the radiator. Since the divided body and the radiator can be removed integrally, the work can be done efficiently.

In the present invention, the upper portion of the fan shroud that covers the upper side of the intake space, the lower portion that covers the lower side of the intake space, and the front side of the intake space in the removal direction. It is preferable that the front side portion to be covered can be removed.

According to this configuration, the upper part, the lower part, and the front part are not likely to interfere with the cooling fan even if they are removed rearward along the removal direction. Therefore, the fan shroud can be removed and removed without interfering with the cooling fan.

In the present invention, it is preferable that the upper portion, the lower portion, and the front portion are integrally formed.

According to this configuration, the operator can remove the upper part, the lower part, and the front part integrally, so that the work can be performed more efficiently than when each of them is removed separately.

In the present invention, in the fan shroud, the vertical wall portion covering the side surface of the intake space on the cooling fan side is the front side vertical wall portion located on the front side in the removal direction and the removal direction. It is divided into a back side vertical wall portion located on the back side of the above, and the front side vertical wall part can be removed and removed integrally with the upper part, the lower part, and the front side part. It is preferable that the back side vertical wall portion is provided integrally with the back side portion that covers the back side of the intake space in the removal direction.

According to this configuration, when removing the fan shroud, the operator can perform the upper part, the lower part, and the front side in a state where the integrally provided back side vertical wall part and the back side part are separated. The part and the vertical wall part on the front side can be removed integrally, and the work can be performed efficiently.

In the present invention, an intake opening for intake air by the cooling fan is formed in the vertical wall portion, and a peripheral wall portion protruding toward the cooling fan side is formed in the outer peripheral portion of the intake opening, and the cooling is performed. The fan is provided in a state of being inserted into the peripheral wall portion, and the boundary between the front side vertical wall portion and the back side vertical wall portion of the peripheral wall portion is connected so as to be disconnectable, and the upper portion and the lower portion are connected. It is preferable that the side portion and the front side portion are supported by the radiator.

According to this configuration, since the outer peripheral portion of the intake opening is covered with the peripheral wall portion, intake by the cooling fan is efficiently performed. Since a plurality of divided bodies are connected at the boundary of the peripheral wall portion by using the peripheral wall portion protruding toward the cooling fan side, the connection and disconnection are performed as compared with the structure in which the end faces of the wall surfaces of the plurality of divided bodies are abutted against each other. Easy to operate. Further, the upper portion, the lower portion, and the front portion of the fan shroud are supported by the radiator. Therefore, the operator can remove the upper portion, the lower portion, and the front portion of the fan shroud together with the radiator by releasing the connection at the boundary of the peripheral wall portion.

In the present invention, the support frame is formed in a four-sided frame shape along the outer circumference of the radiator, and an opening is formed in the lower frame-shaped portion so as to penetrate vertically, and a lid body capable of opening and closing the opening is provided. It is preferable that it is used.

According to this configuration, dust adhering to the cooling air inlet portion of the radiator may fall after the cooling operation of the cooling fan is completed and accumulate on the lower frame-shaped portion. When the lid is opened, the accumulated dust is discharged downward through the opening. During the operation of the cooling fan, the opening is closed by the lid so that the cooling air can be properly passed through the dustproof case.

It is a side view which shows the combine as a work vehicle in 1st Embodiment. It is a top view which shows the combine as a work vehicle in 1st Embodiment. It is a transmission system diagram which shows the power transmission of a combine in the 1st Embodiment. It is a functional block diagram which shows the switching operation of a clutch operation unit, and the flow of data in 1st Embodiment. It is a flowchart which shows the switching control of a clutch in 1st Embodiment. It is a flowchart which shows the switching control of a clutch in 1st Embodiment. It is a time chart diagram which shows the switching control of a clutch in 1st Embodiment. It is a time chart diagram which shows the switching control of a clutch in 1st Embodiment. It is a time chart diagram which shows the switching control of a clutch in 1st Embodiment. It is a right side view which shows the combine in the 2nd Embodiment. It is a top view which shows the cutting part in 2nd Embodiment. It is a right side view which shows the scraping reel in 2nd Embodiment. It is a top view which shows the scraping reel in 2nd Embodiment. It is a right side view which shows the reel frame and the inner tine in the 2nd Embodiment. It is an exploded perspective view which shows the mounting structure of the inner tine and the cover member in 2nd Embodiment. It is a front view which shows the inner tine and the cover member in the 2nd Embodiment. 16 is a cross-sectional view taken along the line XVII-XVII in FIG. 16 is a cross-sectional view taken along the line XVIII-XVIII in FIG. It is an overall side view of the combine in the third embodiment. It is the whole plan view of the combine in 3rd Embodiment. It is a rear view which shows the internal structure of the engine room in 3rd Embodiment. It is a front view which shows the internal structure of the engine room in 3rd Embodiment. It is a top view which shows the internal structure of the engine room in 3rd Embodiment. It is a back sectional view which shows the support structure of the radiator in 3rd Embodiment. It is an exploded perspective view which shows the support structure of a radiator in 3rd Embodiment. It is sectional drawing which shows the attachment state of the lid body in 3rd Embodiment. It is a perspective view which shows the separation structure of the fan shroud in the third embodiment. It is a figure which shows the support structure of the supply pipe in the 3rd Embodiment.

Hereinafter, when defining the front-rear direction of the traveling vehicle of the combine, it is defined along the traveling direction of the aircraft in the working state, and when defining the left-right direction of the aircraft, the left and right are defined in the state of the traveling direction of the aircraft. .. That is, the direction indicated by reference numeral (F) in FIGS. 1, 2, 10, 11, 19 and 20 is the front direction of the airframe, that is, FIG. 1, FIG. 2, FIG. 10, FIG. 11, FIG. 19 and FIG. 20. The direction indicated by the symbol (B) is the rearward direction of the aircraft. The direction indicated by the reference numeral (L) in FIGS. 2, 11 and 20 is the left direction of the aircraft, and the direction indicated by the reference numeral (R) in FIGS. 2, 11 and 20 is the right direction of the aircraft. Therefore, the left-right direction of the machine body corresponds to the width direction of the traveling machine body.

[First Embodiment]
Hereinafter, the first embodiment of the work platform according to the present invention will be described with reference to FIGS. 1 to 9. The first embodiment shows an example of the present invention for solving the above-mentioned [first problem]. FIGS. 1 and 2 show ordinary combine harvesters for crops such as rice, wheat and soybean.

A pair of left and right crawler traveling devices 2 are provided below the body frame 1 of the traveling machine.
A harvesting unit 3 as a working device is provided in front of the traveling machine, and the harvesting unit 3 harvests the crop to be harvested and transports it to the rear. A threshing device 4, a grain tank 5, a grain discharging device 6, and the like are provided on the machine frame 1 as the working device of the present invention. The threshing apparatus 4 handles and processes the harvested culms transported from the harvesting unit 3, and sorts the threshed products obtained by the handling process into grains and waste products. The grain tank 5 stores the grains obtained by the threshing device 4. The grain discharge device 6 discharges the grains stored in the grain tank 5 to the outside of the machine. The combine is configured as a whole culm throwing type in which the root of the planted culm is cut and cut, and all the cut culms are put into the threshing device 4.

A driving unit 7 is provided on the fuselage frame 1, and the driving unit 7 is an area with a cabin on which the operator boarded and operates the operation. The driving unit 7 is located on the right side of the front portion of the machine body, and the grain tank 5 is located behind the driving unit 7. Further, the threshing device 4 is located on the left side and the grain tank 5 is located on the right side, and the threshing device 4 and the grain tank 5 are arranged side by side in the left-right direction. An engine 8 as a drive source capable of rotationally driving is provided on the lower side of the driving unit 7. The threshing device 4 has a handling cylinder 9 that is rotationally driven around an axis along the front-rear direction of the machine body, and handles the cut grain culms transported to the front part of the threshing device 4 by the handling body 9 while sending them to the rear of the machine body. It is configured to do.

The harvesting section 3 is provided with a cutting section 10 and a feeder 11 side by side. The cutting section 10 is provided in the front portion of the harvesting section 3, cuts the planted grain culms to be harvested, and laterally feeds and joins the cut cut grain culms to the middle portion of the width of the machine body. The feeder 11 is connected to the rear part of the cutting section 10 and transports all the culms of the cutting culms collected by the cutting section 10 to the middle portion of the machine width of the cutting section 10 backward toward the threshing device 4. To do. The harvesting section 3 including the cutting section 10 and the feeder 11 is moved to an ascending position around the horizontal axis P1 by expanding and contracting the lifting hydraulic cylinder 12 erected over the machine frame 1 and the feeder 11. It is supported so that it can swing up and down with the descending position.

The cutting section 10 is supported by a cutting frame 13 formed by connecting a square pipe, an angle member having an L-shaped cross section, and the like. The cutting section 10 is provided with a pair of left and

right dividers

14 and 14, a scraping reel 15, a cutting blade 16, and a lateral feed auger 17. A pair of left and

right dividers

14, 14 are provided at the foremost end of the traveling machine body, and weed the planted culms to be harvested and the planted culms to be non-cut. The scraping reel 15 is located behind and above the divider 14, and scrapes the planted culm to be harvested toward the rear. The cutting blade 16 is located behind the divider 14 and cuts the root side of the planted culm to be harvested, which is scraped backward by the scraping reel 15, and is configured in a hair clipper shape, for example. There is. The lateral feed auger 17 is located between the cutting blade 16 and the feeder 11, and the cut grain culms cut by the cutting blade 16 are laterally fed to the middle side in the left-right direction to gather and gather toward the rear feeder 11. And send it out.

[Transmission structure of the first embodiment]
A description of the transmission structure for transmitting the power of the engine 8 to the threshing device 4, the harvesting unit 3, and the like is described below. FIG. 3 is a system diagram of a transmission mechanism that transmits the driving force of the engine 8 to the crawler traveling device 2, the harvesting section 3, the threshing device 4, and the grain discharging device 6, respectively. The engine 8 is provided with an output shaft 8a. The output shaft 8a protrudes from the main body of the engine 8 to the left and right sides of the machine. The first transmission belt 23 is wound around the pulleys of the output shaft 8a and the wall insert drive shaft 21, and the second transmission belt 24 is wound around the pulleys of the output shaft 8a and the traveling transmission shaft 22. Has been done. As a result, the output shaft 8a is configured so that the wall insert drive shaft 21 and the traveling transmission shaft 22 can be driven by belts.

A belt tension type threshing clutch 23A is provided on the first transmission belt 23, and the threshing clutch 23A applies tension to the first transmission belt 23 so that the first transmission belt 23 can transmit power. The threshing clutch 23A corresponds to the "working clutch" of the present invention.

The power transmitted to the traveling transmission shaft 22 is transmitted to the traveling driving device 60. Although detailed description will be omitted, the traveling drive device 60 is provided at a lower portion in the front portion of the machine body, and has a hydrostatic continuously variable transmission and a transmission. Further, the traveling drive device 60 drives the left and right

crawler traveling devices

2 and 2 at a speed suitable for the driving operation based on the driving operation of the shifting operation tool and the turning operation tool (not shown) provided in the driving unit 7. It is configured as follows. The traveling drive device 60 is driven so that the left and right

crawler traveling devices

2 and 2 have a constant speed or a substantially constant speed when traveling straight, and the left and right

crawler traveling devices

2 and 2 have a speed difference when turning.

The transmission power of the wall insert drive shaft 21 is transmitted to the first item collection unit 28 and the second item collection unit 29 via the sorting transmission belt 25, respectively. Further, the transmission power of the wall insert drive shaft 21 is transmitted to the threshing relay shaft 37 via the threshing transmission belt 30. A wall insert 33 is provided on the wall insert drive shaft 21, and the wall insert 33 rotates around the wall insert drive shaft 21.

The sorting transmission belt 25 is wound around the wall insert drive shaft 21, the relay shaft 26, the first item collection unit 28, and the second item collection unit 29, and the first item collection unit 28 and the second item are collected. The recovery unit 29 is integrally driven by a belt via a sorting transmission belt 25. The sorting transmission belt 27 is wound around the relay shaft 26 and the swing sorting device 32, and the transmission power of the wall insert drive shaft 21 is transmitted via the sorting transmission belt 25, the relay shaft 26, and the sorting transmission belt 27. It is transmitted to the swing sorting device 32.

The threshing transmission belt 30 is wound around the wall insert drive shaft 21 and the threshing relay shaft 37. A bevel gear 43a is provided at an end of the threshing relay shaft 37 on the side opposite to the side on which the threshing transmission belt 30 is wound, and the bevel gear 43a engages with the bevel gear 43c of the handling barrel shaft 9A. The handling barrel shaft 9A is a rotating shaft core of the handling barrel 9 and extends in the front-rear direction, and a bevel gear 43c is provided at the front end portion of the handling barrel shaft 9A. Further, a counter shaft 39 is provided on the side opposite to the side where the threshing relay shaft 37 is located with the handling barrel shaft 9A sandwiched in the left-right direction. A bevel gear 43b is provided at the left end of the counter shaft 39, and the bevel gear 43b engages with the bevel gear 43c. The threshing relay shaft 37 and the counter shaft 39 are arranged on the same shaft core in the lateral direction of the machine body, and as the threshing relay shaft 37 rotates, the rotational power of the threshing relay shaft 37 via the

bevel gears

43a, 43b, 43c. Is transmitted to the handling barrel shaft 9A and the counter shaft 39, respectively. The counter shaft 39 rotates in the direction opposite to the rotation direction of the threshing relay shaft 37. The threshing relay shaft 37, the handling barrel shaft 9A, and the counter shaft 39 are each covered with a shaft case 36. The left end of the threshing relay shaft 37 protrudes to the left side of the machine from the shaft case 36, and the right end of the counter shaft 39 protrudes to the right side of the shaft case 36.

The transmission power of the threshing relay shaft 37 is configured to be transmittable to the cutting input shaft 42 via the cutting transmission belt 40. The cutting transmission belt 40 is provided so as to extend forward from the threshing relay shaft 37. Further, the counter shaft 39 is configured to be transmittable to the cutting input shaft 42 via the cutting transmission belt 41. The cutting transmission belt 41 is located on the side opposite to the side where the cutting transmission belt 40 is located with the feeder 11 sandwiched in the left-right direction.

The cutting input shaft 42 functions as a drive shaft of the feeder 11, and is provided in a state of protruding outward on the left side from the transport case of the feeder 11. The cutting

transmission belts

40 and 41 are wound around the left and right ends of the cutting input shaft 42, respectively. A sprocket is attached to a portion of the cutting input shaft 42 inside the feeder 11, and the cutting input shaft 42 and the feeder transport chain 11A rotate integrally via the sprocket.

A belt tension type cutting clutch 40A is provided on the cutting transmission belt 40, and the cutting clutch 40A applies tension to the cutting transmission belt 40 so that the cutting transmission belt 40 can transmit power. A belt tension type cutting clutch 41A is provided on the cutting transmission belt 41, and the cutting clutch 41A applies tension to the cutting transmission belt 41 so that the cutting transmission belt 41 can transmit power. The cutting

clutches

40A and 41A do not apply tension to the cutting

transmission belts

40 and 41 at the same time, and one of the cutting

clutches

40A and 41A is one of the cutting

transmission belts

40 and 41. Is configured to apply tension to the clutch. When the cutting clutch 40A applies tension to the cutting transmission belt 40, the cutting unit 10 and the feeder 11 rotate so as to convey the cutting grain culm to the rear of the machine body. When the cutting clutch 41A applies tension to the cutting transmission belt 41, the cutting unit 10 and the feeder 11 are reversed, and for example, when the cutting grain culm is clogged with the feeder 11, the cutting grain culm is returned to the front of the machine body.

The transmission power of the cutting input shaft 42 is transmitted to the cutting relay shaft 45 by the cutting transmission belt 44 extending in the front-rear direction along the outside of the right side portion of the feeder 11. The transmission power of the cutting relay shaft 45 is transmitted to the lateral feed auger 17 via the chain 46 and is transmitted to the cutting blade 16 via the reciprocating rotating rod 47. The reciprocating rotation rod 47 is configured to be able to reciprocally slide the cutting blade 16 by reciprocatingly rotating at a predetermined angle. Further, the transmission power of the cutting relay shaft 45 is transmitted to the suction reel 15 via the

chains

46 and 48 and the belt 49.

Of the output shaft 8a, a pulley for winding the discharge transmission belt 50 is provided at the end opposite to the side where the first transmission belt 23 and the second transmission belt 24 are located, and the output shaft 8a and the discharge input shaft 51 are provided. The discharge transmission belt 50 is wound around the above. A belt tension type discharge clutch 50A is provided on the discharge transmission belt 50, and the discharge clutch 50A applies tension to the discharge transmission belt 50 so that the discharge transmission belt 50 can transmit the power of the engine 8 to the discharge input shaft 51. It is configured. When the discharge clutch 50A applies tension to the discharge transmission belt 50, the discharge screw 6A inside the grain discharge device 6 rotates via the discharge input shaft 51, and the grains stored in the grain tank 5 are discharged from the grain discharge device. It is discharged to the outside of the machine via 6. As described above, the working device of the present invention is driven by the engine 8 as a drive source.

[About the clutch of the first embodiment]
As described with reference to FIG. 3, as clutches capable of transmitting power to the transmission belt, a threshing clutch 23A, a cutting clutch 40A, 41A, and a discharge clutch 50A are provided. These clutches intervene in the power transmission system described above. The threshing clutch 23A is arranged adjacent to the first transmission belt 23. The cutting clutch 40A is arranged adjacent to the cutting transmission belt 40, and the cutting clutch 41A is arranged adjacent to the cutting transmission belt 41. The discharge clutch 50A is arranged adjacent to the discharge transmission belt 50. Each of these clutches is a belt tensioner that can engage with each adjacent transmission belt and is configured to be switchable between a transmission state and a non-transmission state. In the first embodiment, the "transmission state" means a state in which the clutch transmits power to the adjacent transmission belts, and the "non-transmission state" means that the clutch transmits power to the adjacent transmission belts. It means a state in which power is not transmitted. These clutches are configured to be operable by the first clutch operating unit 52A and the second clutch operating unit 52B as shown in FIG.

Although not shown, the threshing clutch 23A and the first clutch operation unit 52A are linked by an operation wire. The first clutch operation unit 52A is configured to be able to switch the threshing clutch 23A to the transmission state by pulling the operation wire. Although not shown, the threshing clutch 23A is provided with a spring, and the threshing clutch 23A is urged away from the first transmission belt 23. From this, if the first clutch operating unit 52A does not pull the operating wire of the threshing clutch 23A, the threshing clutch 23A is held in the non-transmission state.

Although not shown, the cutting clutch 40A and the second clutch operation unit 52B are linked by an operation wire. The second clutch operation unit 52B is configured to be able to switch the cutting clutch 40A to the transmission state by pulling the operation wire. The cutting clutch 41A and the second clutch operating unit 52B are linked by an operating wire. The second clutch operation unit 52B is configured to be able to switch the cutting clutch 41A to the transmission state by pulling the operation wire. The discharge clutch 50A and the second clutch operation unit 52B are linked by an operation wire, and the second clutch operation unit 52B is configured to be able to switch the discharge clutch 50A to the transmission state by pulling the operation wire. The second clutch operation unit 52B is configured so that the cutting

clutches

40A and 41A and the discharge clutch 50A can be individually (independently) switched between a transmission state and a non-transmission state.

Although not shown, the threshing clutch 23A, the cutting

clutches

40A and 41A, and the discharge clutch 50A are each provided with a spring, and each of these clutches is urged away from their adjacent belts. There is. From this, if the second clutch operating unit 52B does not pull the operating wires of the cutting

clutches

40A and 41A and the discharging clutch 50A, the cutting

clutches

40A and 41A and the discharging clutch 50A are not used. It is held in the transmission state.

[Transmission switching operation by the clutch operation unit in the first embodiment]
As shown in FIG. 4, the clutch operation unit 52 includes a first clutch operation unit 52A and a second clutch operation unit 52B. The first clutch operation unit 52A and the threshing clutch 23A are linked to each other via an operation wire. Although not shown, the first clutch operating unit 52A has an electric motor, and the operating wire extending between the first clutch operating unit 52A and the threshing clutch 23A is pulled or loosened by the electric motor.

The second clutch operation unit 52B and the cutting clutch 40A are linked to each other via an operation wire. The second clutch operation unit 52B and the cutting clutch 41A are linked to each other via an operation wire. The second clutch operation unit 52B and the discharge clutch 50A are linked to each other via an operation wire. That is, three operation wires, an operation wire linked with the cutting clutch 40A, an operation wire linked with the cutting clutch 41A, and an operation wire linked with the discharge clutch 50A, are connected to the second clutch operation unit 52B. .. Although not shown, the second clutch operating unit 52B has an electric motor, and these three operating wires are pulled and loosened by the electric motor.

The second clutch operation unit 52B is configured so that these three operation wires are individually pulled or loosened as the electric motor of the second clutch operation unit 52B operates. For example, between each of these three operating wires and the electric motor, three cam mechanisms are interposed corresponding to each of the three operating wires, and each of these three cam mechanisms is provided with each of the three operating wires. It is formed in a different shape corresponding to. Then, each of the cam mechanisms rotates with the operation of the electric motor, so that these three operation wires are pulled or loosened separately. It should be noted that these three operating wires may be pulled or loosened at the same time as the electric motor of the second clutch operating unit 52B operates.

The clutch operation unit 52 includes an ECU (Electronic Control Unit), a memory (for example, DRAM or EEPROM), a relay circuit, various input / output devices, and the like, in addition to the first clutch operation unit 52A and the second clutch operation unit 52B. That is, the clutch operation unit 52 is also configured as an electronic control unit, and the electric motors of the first clutch operation unit 52A and the second clutch operation unit 52B are controlled by the electronic control unit.

The operation switch 54 is arranged at an arbitrary position in the driving unit 7 (see FIG. 1) and is configured to be operable by a passenger boarding the driving unit 7. The control signal of the operation switch 54 is input to the clutch operation unit 52, and the clutch operation unit 52 uses the electric motor of the first clutch operation unit 52A and the electric motor of the second clutch operation unit 52B based on the control signal of the operation switch 54. Control. That is, the electric motors of the first clutch operation unit 52A and the second clutch operation unit 52B are configured to be operable based on the control signal of the operation switch 54, and the above-mentioned operation wires are pulled or loosened. Or something.

The control signal includes an on control signal and an off control signal. That is, the clutch operation unit 52 is configured to be able to detect an on control signal and an off control signal from the operation switch 54. The on-control signal is a control signal related to the on-operation of the clutch, and when the electric motor is rotationally controlled to pull the operation wire based on the on-control signal, the clutch is switched from the non-transmission state to the transmission state. Further, the disengagement control signal is a control signal related to the disengagement operation of the clutch, and when the electric motor is rotationally controlled to loosen the operation wire based on the disengagement control signal, the clutch is switched from the transmission state to the non-transmission state.

As described above, the first clutch operation unit 52A is based on the on-control signal which is a control signal for the on-operation of the threshing clutch 23A and the off-control signal which is the control signal for the off-operation of the threshing clutch 23A. Is configured so that it can be switched between a transmission state and a non-transmission state. Further, the second clutch operation unit 52B has an on-control signal which is a control signal related to each on-operation of the cutting

clutches

40A and 41A and the discharge clutch 50A, and an off-control signal which is a control signal related to the off-operation of these clutches. Based on the signal, each of these clutches is configured to be switchable between a transmission state and a non-transmission state. In other words, the clutch operation unit 52 sets the clutch into a transmission state and a non-transmission state based on the on-control signal, which is a control signal related to the clutch on-operation, and the off-control signal, which is a control signal related to the clutch-off operation. It is configured so that it can be switched.

As described above based on FIG. 3, since each transmission belt shown in FIG. 3 is rotationally driven by the power of the engine 8, the rotation speed of these transmission belts is proportional to the rotation speed of the engine 8. The rotation speed of the engine 8 as a drive source is hereinafter referred to as "engine rotation speed R". The engine speed R includes the meaning of "target speed for engine 8". Further, the engine speed R may include the meaning of "the actual speed of the engine 8".

When the above-mentioned belt tension type clutch is switched from the non-transmission state to the transmission state while the engine speed R is high, the transmission belt adjacent to the clutch suddenly starts to rotate at high speed. In this case, when a sudden load is applied to the transmission belt, impact, vibration, slip, etc. are generated on the transmission belt, which may shorten the life of the transmission belt. In particular, since the first transmission belt 23 transmits power to a working device including a harvesting unit 3, a threshing device 4, and the like, a large load is likely to be applied to the first transmission belt 23. From this, it is desirable that the engine speed R is in a low state when the clutch is switched from the non-transmission state to the transmission state. Therefore, the clutch operation unit 52 in the first embodiment is configured so that the engine speed R can be adjusted when the clutch is switched from the non-transmission state to the transmission state. The operation in which the clutch operation unit 52 switches the clutch from the non-transmission state to the transmission state is hereinafter referred to as "transmission switching operation".

The clutch operation unit 52 is configured so that the set rotation speed can be input from the accelerator operating tool 53, and the actual rotation speed of the engine 8 can be input from the rotation speed detection sensor 55. The accelerator operating tool 53 is, for example, a dial-type or lever-type operating tool, and is configured so that the target rotation speed of the engine 8 can be set based on the operating amount of the accelerator operating tool 53. The rotation speed detection sensor 55 is, for example, a rotation speed detector mounted on the engine 8.

The clutch operating unit 52 is configured to be able to output an instruction signal to the engine control unit 56 based on the amount of operation of the accelerator operating tool 53. The engine control unit 56 is configured to enable various controls on the engine 8, and the actual rotation speed of the engine 8 is adjusted by the engine control unit 56 based on an instruction signal from the clutch operation unit 52. The actual rotation speed of the engine 8 is detected by the rotation speed detection sensor 55, and the detected rotation speed is periodically (for example, every 0.1 seconds) transmitted from the rotation speed detection sensor 55 to the clutch operation unit 52 as a detection signal. ..

The clutch operation unit 52 is configured to be able to output a notification signal to the notification unit 57, and when the clutch operation unit 52 performs a transmission switching operation by the clutch, the notification signal is output from the clutch operation unit 52 to the notification unit 57. The notification unit 57 is, for example, a monitor, a buzzer, an indicator light, or the like arranged in the operation unit 7, and is configured to enable notification regarding a transmission switching operation. The passenger of the driving unit 7 can recognize the state in which the clutch is switched from the non-transmission state to the transmission state by the notification of the notification unit 57. The notification unit 57 may be incorporated in a terminal (for example, a smartphone or a mobile computer) carried by a passenger of the driving unit 7 or a worker working in the field.

The clutch switching control by the clutch operation unit 52 will be described with reference to FIGS. 4 to 6. In FIGS. 5 and 6, the flow chart shows the control when the first clutch operating unit 52A switches the threshing clutch 23A from the non-transmission state to the transmission state. “Start” in FIG. 5 is the timing at which the clutch operation unit 52 detects the ON control signal. From this timing, the clutch switching control is started, and the notification process is started first (step # 01). The notification process is a process in which the clutch operation unit 52 outputs a notification signal to the notification unit 57, and the start of clutch switching control is notified to the passenger of the operation unit 7 via the notification unit 57. This notification process continues until the clutch switching control process reaches step # 17, which will be described later.

After the start of the notification process, it is determined whether the engine speed R is higher than the preset threshold value RL (step # 02). The threshold value RL is stored in advance in the memory of the clutch operation unit 52, for example. Then, the engine speed R and the threshold value RL are compared. The threshold value RL may have an arbitrary hysteresis width, and the hysteresis width stabilizes the determination based on the comparison between the engine speed R and the threshold value RL. When the engine speed R is equal to or less than the threshold value RL (or less than the threshold value RL) (step # 02: No), the clutch switching control proceeds to step # 11 described later.

When the engine speed R is higher than the threshold RL (step # 02: Yes), the speed control flag FL is set to ON (step # 03). The rotation speed control flag FL is a variable used in the processing of the ECU of the clutch operation unit 52, and is used in the second rotation speed control described later. After the rotation speed control flag FL is set to ON, the first rotation speed control is performed (step # 04). The "first rotation speed control" is a control for lowering the engine speed R so that the engine speed R becomes equal to or less than the threshold RL (or less than the threshold RL). In the first rotation speed control, an instruction signal for lowering the engine rotation speed R is transmitted from the clutch operation unit 52 to the engine control unit 56, and in the engine control unit 56, the actual rotation speed of the engine 8 is equal to or less than the threshold RL (or the threshold RL). The engine 8 is controlled so as to be less than). The engine speed R changes with time, and the determination of whether or not the engine speed R is higher than the threshold value RL is periodically repeated (step # 05). When the engine speed R is equal to or less than the threshold RL (or less than the threshold RL) (step # 05: No), the first speed control of the engine speed R ends, and the clutch switching control goes to step # 11 described later. move on.

In step # 11, it is determined whether or not the rotation speed control flag FL is set to ON. When it is determined that the rotation speed control flag FL is ON (step # 11: Yes), the torque of the engine 8 may be unstable because the first rotation speed control is immediately performed at this timing. Conceivable. In this state, for example, if the threshing clutch 23A is subjected to a transmission switching operation, it is conceivable that the output of the engine 8 becomes unstable at this timing. In order to avoid such inconvenience, the wait process as shown in steps # 12 to # 14 is executed. When the rotation speed control flag FL is OFF (step # 11: No), the clutch switching control proceeds to step # 15 described later.

In step # 12, the counting of the first waiting timer Tw1 is started, and the determination of step # 13 is repeated until the first waiting timer Tw1 counts up. The first wait timer Tw1 is a timer variable used in the processing of the ECU of the clutch operation unit 52. The time from the start of counting of the first waiting timer Tw1 in step # 12 to the counting up of the first waiting timer Tw1 in step # 13 is referred to as "first interval time". The first interval time is the time from the completion of the first rotation speed control to the start of the transmission switching operation, and after the first rotation speed control is performed, the change in the actual rotation speed in the engine 8 converges. It is set as a waiting time for the torque of the engine 8 to stabilize. Further, the first interval time is a value stored in the memory of the clutch operation unit 52 and can be changed as appropriate. Of course, the first interval time may be a zero value. In this case, the first wait timer Tw1 counts up immediately (step # 13: Yes), and no waiting time occurs. When the first waiting timer Tw1 counts up (step # 13: Yes), the count state of the first waiting timer Tw1 is cleared (step # 14).

In step # 15, counting of the notification timer Tn is started. The notification timer Tn is a timer variable used in the processing of the ECU of the clutch operation unit 52, and is used to set the end timing of the notification processing started in step # 01. After the count of the notification timer Tn is started, the transmission switching operation for the threshing clutch 23A is started (step # 16). The start of counting the notification timer Tn in step # 15 and the start of the transmission switching operation for the threshing clutch 23A in step # 16 may be performed at the same time.

In the first embodiment, the notification process by the notification unit 57 ends before the transmission switching operation for the threshing clutch 23A is completed. Therefore, it is determined whether or not the notification timer Tn counts up after the transmission switching operation for the threshing clutch 23A is started (step # 17). The count-up time of the notification timer Tn is set to be shorter than the time required for the transmission switching operation for the threshing clutch 23A. Further, the count-up time of the notification timer Tn is stored in the memory of the clutch operation unit 52 and is a value that can be appropriately changed.

When the notification timer Tn counts up (step # 17: Yes), the notification process by the notification unit 57 ends (step # 18), and the count state of the notification timer Tn is cleared (step # 19). Then, it is determined whether or not the transmission switching operation for the threshing clutch 23A is completed (step # 20), and the processes of steps # 17 to # 20 are repeated until the transmission switching operation for the threshing clutch 23A is completed. During this time, the operation wire extending over the threshing clutch 23A and the first clutch operation unit 52A is pulled by the operation of the electric motor of the first clutch operation unit 52A, and the threshing clutch 23A is switched from the non-transmission state to the transmission state. If the processing of steps # 17 to # 20 is repeated after the determination of Yes is performed in step # 17 and the processing of steps # 18 and # 19 is performed, the notification timer Tn is in the counting state. Therefore, step # 17 always determines No. Further, although not shown in the flowchart, when the transmission switching operation is completed (step # 20: Yes) and the notification timer Tn is counting, the notification processing by the notification unit 57 ends and the notification timer Tn The count status is cleared.

When the transmission switching operation for the threshing clutch 23A is completed (step # 20: Yes), it is determined whether or not the rotation speed control flag FL is set to ON (step # 21). When the rotation speed control flag FL is OFF (step # 21: No), the clutch switching control ends as it is. When the rotation speed control flag FL is ON (step # 21: Yes), the second rotation speed control is performed in the processes of steps # 23 to # 27. "Second rotation speed control" means that when the transmission switching operation is completed in a state where the first rotation speed control is performed and the engine rotation speed R is equal to or less than the threshold value RL (or less than the threshold value RL), the engine rotation speed R is changed. It is a control that raises the engine speed R so as to be higher than the threshold value RL. By this second rotation speed control, the engine rotation speed R is restored.

After the rotation speed control flag FL is cleared in step # 22, counting of the second waiting timer Tw2 is started (step # 23), and the determination of step # 24 is repeated until the second waiting timer Tw2 counts up. The second wait timer Tw2 is a timer variable used in the processing of the ECU of the clutch operation unit 52. The time from the start of counting of the second waiting timer Tw2 in step # 23 to the counting up of the second waiting timer Tw2 in step # 24 is referred to as "second interval time". The second interval time is the time from the completion of the transmission switching operation to the start of the second rotation speed control, and the impact and vibration applied to the first transmission belt 23 converge and the rotational state of the first transmission belt 23 becomes stable. It is set as a waiting time to do. The second interval time is a value stored in the memory of the clutch operation unit 52 and can be changed as appropriate. Of course, the second interval time may be a zero value. In this case, the second wait timer Tw2 immediately counts up (step # 24: Yes), and no waiting time occurs. When the second waiting timer Tw2 counts up (step # 24: Yes), the count state of the second waiting timer Tw2 is cleared (step # 25).

The counts of the first wait timer Tw1, the second wait timer Tw2, and the notification timer Tn may be incremented from the zero value to the count-up time value. Further, the counts of the first wait timer Tw1, the second wait timer Tw2, and the notification timer Tn may be decremented from the value of the count-up time to the zero value. The count-up times of the first waiting timer Tw1, the second waiting timer Tw2, and the notification timer Tn are set separately.

The second rotation speed control is started in step # 26, and the determination in step # 27 is repeated until the completion of the second rotation speed control is determined. During this time, the engine speed R changes with time, and the engine speed R and the set speed of the accelerator operating tool 53 are periodically compared. In the second rotation speed control, an instruction signal for increasing the engine rotation speed R is transmitted from the clutch operation unit 52 to the engine control unit 56, and in the engine control unit 56, the actual rotation speed of the engine 8 is the set rotation speed of the accelerator operating tool 53. The engine 8 is controlled to reach the number. When the engine speed R reaches the set speed of the accelerator operating tool 53, the completion of the second speed control is determined (step # 27: Yes), and the clutch switching control ends.

7 to 9 show time charts of the engine speed R, the state of the threshing clutch 23A (see FIG. 4 and the like, the same applies hereinafter), and the notification process by the notification unit 57 (see FIG. 4, the same applies hereinafter). Is shown over time. In FIGS. 7 to 9, the non-transmission state and the transmission state of the threshing clutch 23A are shown by horizontal lines, and the state during the transmission switching operation for the threshing clutch 23A is shown by an inclined line. ing.

FIG. 7 shows how the clutch operating unit 52 (see FIG. 4, the same applies hereinafter) performs a transmission switching operation when the engine speed R is always equal to or lower than the threshold value RL.
In the example shown in FIG. 7, No is determined in step # 02 based on the flowchart shown in FIG. Since the rotation speed control flag FL is not set to ON, the determination of No is performed in step # 11, and the determination of No is also performed in step # 21. From this, the process of step # 01, the process of step # 15, and the process of step # 16 are performed substantially at the same time. Therefore, the timing at which the transmission switching operation for the threshing clutch 23A is started and the timing at which the notification process by the notification unit 57 is started are substantially simultaneous.

In FIG. 7, the timing at which the threshing clutch 23A starts to shift from the non-transmission state to the transmission state is the detection timing of the input control signal. The processing of step # 01 shown in FIG. 5 and the processing of steps # 15 and # 16 shown in FIG. 6 are performed substantially simultaneously at the detection timing of the input control signal. As described above, when the engine speed R is equal to or less than the preset threshold value RL (or lower than the threshold value RL) when the clutch operation unit 52 detects the ON control signal, the clutch operation unit 52 is the threshing clutch 23A. Immediately perform the transmission switching operation for.

FIG. 8 shows how the clutch operation unit 52 performs the transmission switching operation when the engine speed R is R1 which is higher than the threshold value RL. In this case, the set rotation speed of the accelerator operating tool 53 (see FIG. 4, the same applies hereinafter) is set to R1. Further, FIG. 9 shows a state in which the transmission switching operation is performed by the clutch operation unit 52 when the engine speed R is R2 having a speed higher than the threshold value RL. In this case, the set rotation speed of the accelerator operating tool 53 is set to be R2, and R2 is a rotation speed lower than R1.

In any of the examples shown in FIGS. 8 and 9, the processes of steps # 01 to # 04 in FIG. 5 are performed at the timing when the clutch operation unit 52 detects the on-control signal. In the example shown in FIG. 8, the first rotation speed control is performed during the time Td1, and in the example shown in FIG. 9, the first rotation speed control is performed during the time Td2. In this way, when the engine speed R is higher than the threshold RL when the clutch operation unit 52 detects the ON control signal, the clutch operation unit 52 controls the first speed and the engine speed R is the threshold RL. The transmission switching operation for the grain removal clutch 23A is performed in a state of being below (or less than the threshold value RL).

In the first rotation speed control shown in FIG. 8, the engine rotation speed R is lowered from R1 to the threshold value RL during the time Td1. If the rate of change of the engine speed R per unit time in the first speed control is defined as the first rate of change Rd, the first rate of change Rd is calculated from the following formula in the example shown in FIG.
Rd = (R1-RL) / Td1

Further, in the first rotation speed control shown in FIG. 9, the engine rotation speed R is lowered from R2 to the threshold value RL during the time Td2. In the example shown in FIG. 9, the above-mentioned first rate of change Rd is calculated from the following formula.
Rd = (R2-RL) / Td2

The first rate of change Rd is represented by the degree of inclination of the graph of the engine speed R in FIGS. 8 and 9. The broken line shown in the graph of the engine speed R in FIG. 9 is a superposition of the solid lines shown in the graph of the engine speed R in FIG. As shown in FIG. 9, the degree of inclination (broken line) of the graph of the engine speed R when the engine speed R is lowered from R1 to the threshold RL, and the degree of inclination (broken line) when the engine speed R is lowered from R2 to the threshold RL. The degree of inclination (solid line) of the graph of the engine speed R is the same. From this, as shown in the following equation, the first rate of change Rd is constant regardless of the engine speed R at the time when the clutch operating unit 52 detects the ON control signal.
Rd = (R1-RL) / Td1 = (R2-RL) / Td2

In any of the examples shown in FIGS. 8 and 9, after the completion of the first rotation speed control, the first wait timer Tw1 is counted based on the processes of steps # 12 and # 13 shown in FIG. The first interval time is shown by "Tw1" in FIGS. 8 and 9. After the lapse of the first interval time, the transmission switching operation for the threshing clutch 23A is started based on the process of step # 16 shown in FIG. After the transmission switching operation is completed, the second wait timer Tw2 is counted based on the processes of steps # 23 and # 24, and the second interval time is shown by "Tw2" in FIGS. 8 and 9.

After the lapse of the second interval time, in any of the examples shown in FIGS. 8 and 9, the second rotation speed control based on the process of step # 26 in FIG. 6 is performed. In the example shown in FIG. 8, the second rotation speed control is performed during the time Ta1, and in the example shown in FIG. 9, the second rotation speed control is performed during the time Ta2.

In the second rotation speed control shown in FIG. 8, the engine rotation speed R is raised from the threshold value RL to R1 during the time Ta1. If the rate of change of the engine speed R per unit time in the second speed control is defined as the second rate of change Ru, the second rate of change Ru is calculated from the following formula in the example shown in FIG.
Ru = (R1-RL) / Ta1

Further, in the second rotation speed control shown in FIG. 9, the engine rotation speed R is raised from the threshold value RL to R2 during the time Ta2. In the example shown in FIG. 9, the above-mentioned second rate of change Ru is calculated from the following formula.
Ru = (R2-RL) / Ta2

The second rate of change Ru is represented by the degree of inclination of the graph of the engine speed R in FIGS. 8 and 9. Further, the second rate of change Ru is constant as shown in the following equation.
Ru = (R1-RL) / Ta1 = (R2-RL) / Ta2
The second rate of change Ru does not have to be constant, and for example, the second rate of change Ru may change according to the set rotation speed of the accelerator operating tool 53.

In the first embodiment, the first rate of change Rd is set smaller than the second rate of change Ru. In other words, the time Td1 is set longer than the time Ta1, and the time Td2 is set longer than the time Ta2. When the crawler traveling device 2 is driven when the first rotation speed control is executed, it is conceivable that the actual rotation speed of the engine 8 suddenly drops due to the driving load of the crawler traveling device 2. In such a case, the crawler traveling device 2 may suddenly decelerate, which may surprise or make the operator feel uncomfortable. In this configuration, since the engine speed R is gradually lowered based on the first rate of change Rd, the crawler traveling device 2 gradually decelerates without sudden deceleration. Therefore, the possibility that the operator is surprised or uncomfortable when executing the first rotation speed control is greatly reduced.

The first interval time is the time to wait for the output of the engine 8 (see FIG. 3, the same applies hereinafter) to stabilize immediately after the first rotation speed control, and the second interval time is the time immediately after the transmission switching operation. It is a time to wait for the impact and vibration applied to the transmission belt 23 (see FIG. 4, the same applies hereinafter) to converge. As described above, since the engine speed R is gradually lowered in the first rotation speed control, the output of the engine 8 immediately after the first rotation speed control is the impact of the first transmission belt 23 after the transmission switching operation is completed. It stabilizes faster than waiting for the vibration to converge. Therefore, in the first embodiment, the first interval time shown by "Tw1" in FIGS. 8 and 9 is set shorter than the second interval time shown by "Tw2" in FIGS. 8 and 9. .. In other words, the second interval time indicated by "Tw2" in FIGS. 8 and 9 is set longer than the first interval time indicated by "Tw1" in FIGS. 8 and 9. The second interval time is set to, for example, 0.7 seconds. The first interval time is set to, for example, 0 to 0.3 seconds, and may be a zero value.

The set time counted by the notification timer Tn is indicated by the interval time of "Tn" in FIGS. 7 to 9, and the notification process is switched from ON to OFF at the timing when the count of the notification timer Tn ends. The set time counted by the notification timer Tn is a set time preset from the start of the transmission switching operation for the threshing clutch 23A. That is, as shown in FIGS. 7 to 9, the notification unit 57 has a time when the clutch operation unit 52 detects the ON control signal and a time when a preset set time has elapsed from the start of the transmission switching operation. Continue to notify about the transmission switching operation.

At the timing when the notification process is switched from ON to OFF, the transmission switching operation for the threshing clutch 23A is not completed. That is, the set time counted by the notification timer Tn is set before the completion of the transmission switching operation. For example, if the time required from the start to the completion of the transmission switching operation is 1.3 seconds, the set time counted by the notification timer Tn is set to, for example, 1 second. Then, when the count of the notification timer Tn elapses for the set time, the notification unit 57 stops the notification. Therefore, the notification by the notification unit 57 does not have to be persistent, and the possibility that the operator feels the notification unpleasant is reduced.

[Another Embodiment of the First Embodiment]
The present invention is not limited to the configuration exemplified in the first embodiment described above, and the following, typical alternative embodiments of the present invention will be exemplified.

(1-1) In the first embodiment described above, the configuration in which the clutch operating unit 52 transmits and switches the threshing clutch 23A is exemplified, but the "working clutch" of the present invention includes the cutting

clutches

40A and 41A and the discharge clutch. It may be 50A. When the cutting clutch 40A is the "working clutch" of the present invention, the "transmission belt" of the present invention is the cutting transmission belt 40. When the cutting clutch 41A is the "working clutch" of the present invention, the "transmission belt" of the present invention is the cutting transmission belt 41. In addition, when the discharge clutch 50A is the "work clutch" of the present invention, the "transmission belt" of the present invention is the discharge transmission belt 50.

(1-2) In the first embodiment described above, when the transmission switching operation is completed in a state where the first rotation speed control is performed and the engine rotation speed R is equal to or less than the threshold value RL, the clutch operation unit 52 makes a second rotation. Numerical control is performed, but the present invention is not limited to this first embodiment. For example, the clutch operation unit 52 may be configured to be selectable and set so as not to perform the second rotation speed control.

(1-3) In the first embodiment described above, the clutch operation unit 52 controls the second rotation speed so that the engine rotation speed R reaches the set rotation speed of the accelerator operating tool 53. Not limited to. For example, in step # 03 shown in FIG. 6, the engine speed control flag FL may be set to ON, and at the same time, the engine speed R at this timing may be stored in the memory of the clutch operation unit 52. .. In this case, in the second rotation speed control, the engine control unit 56 controls the engine 8 so that the actual rotation speed of the engine 8 reaches the engine rotation speed R stored in step # 03. good. Then, in step # 27, when the engine speed R reaches the engine speed R stored in step # 03, the completion of the second rotation speed control is determined, and the clutch switching control is terminated. good.

(1-4) In the first embodiment described above, in the first rotation speed control, the engine rotation speed R is lowered in proportion to the time based on the first rate of change Rd. Not limited. For example, in the first rotation speed control, the engine rotation speed R may be lowered in an S-shaped curve by control based on a known minimum jerk model or the like. Further, for example, in the second rotation speed control, the engine rotation speed R may be increased in an S-shaped curve by control based on a known minimum jerk model or the like.

(1-5) In the first embodiment described above, the first interval time, which is the time from the completion of the first rotation speed control to the start of the transmission switching operation, is provided, but the first interval time is not provided. It may be configured.

(1-6) In the first embodiment described above, the notification unit 57 notifies the transmission switching operation from the time when the clutch operation unit 52 detects the ON control signal to the time before the completion of the transmission switching operation. It is not limited to this first embodiment. For example, the set time counted by the notification timer Tn may be set at a time after the completion of the transmission switching operation. Further, even after the notification timer Tn counts up, the notification unit 57 may perform some notification.

(1-7) In the first embodiment described above, the second interval time is the count time of the second wait timer Tw2, which is the time from the completion of the transmission switching operation to the start of the second rotation speed control. , Not limited to this first embodiment. For example, the count time of the second wait timer Tw2 may be set as the time from the start of the transmission switching operation to the start of the second rotation speed control. In this case, the count time of the second wait timer Tw2 may be set longer than the time required for the transmission switching operation. Of course, the count time of the second wait timer Tw2 may be set longer than the count time of the notification timer Tn. In this case, for example, if the time required from the start to the completion of the transmission switching operation is 1.3 seconds, the set time for the notification timer Tn to count is set to, for example, 1 second, and the count time for the second wait timer Tw2. May be configured to be set to, for example, 2 seconds.

It should be noted that the configuration disclosed in the above-described first embodiment (including another embodiment of the first embodiment, the same shall apply hereinafter) is applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. It is possible. Further, the first embodiment disclosed in the present specification is an example, and the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention. The invention disclosed in the first embodiment described above relates to a work platform. The invention disclosed in the first embodiment can be applied not only to the above-mentioned conventional combine harvester, but also to a tractor, a paddy field working machine, a backhoe, etc. Is.

[Second Embodiment]
Hereinafter, the second embodiment of the harvester according to the present invention will be described with reference to FIGS. 10 to 18. The second embodiment shows an example of the present invention for solving the above-mentioned [second problem].

[Overall configuration of the combine of the second embodiment]
FIG. 10 shows a whole culm harvester (corresponding to the “harvester” according to the present invention). The combine is provided with an airframe frame 101 and a crawler traveling device 102. In front of the machine body, a cutting section 103 is provided for cutting while scraping the planted grain culm. The cutting unit 103 includes a scraping reel 104 for scraping the planted culm, a cutting blade 105 for cutting the planted culm, a scraping auger 106 for scraping the harvested culm, and a cutting frame 107 supporting these. And are provided. Dividers 108 for weeding the planted culms are provided at the front ends of the cutting frame 107 on both the left and right sides.

A driving unit 109 is provided at the front of the aircraft. A threshing device 110 is provided for threshing all the culms of the harvested culms. A feeder 111 for transporting the harvested culm toward the threshing device 110 is provided across the cutting section 103 and the threshing device 110. The feeder 111 is vertically swingably supported by the front portion of the threshing device 110. A hydraulic cylinder 112 for vertically swinging the feeder 111 is provided over the feeder 111 and the machine frame 101. To the right of the threshing device 110, a grain tank 113 for storing the grains obtained by the threshing process of the threshing device 110 is provided. A grain discharge device 114 for discharging grains in the grain tank 113 is provided.

[Scraping reel of the second embodiment]
As shown in FIGS. 11 to 14, the scraping reel 104 includes left and right support arms 115, a scraping reel drive shaft 116, left and right reel frames 117, and a plurality of support bars 118 (related to the present invention). It is provided with a "support member"), a plurality of tines 119, and a tine posture holding mechanism 120.

A connecting shaft 121 for connecting the base ends of the left and right support arms 115 is provided over the base ends of the left and right support arms 115. The left and right support arms 115 are vertically and vertically swingably supported by the rear portion of the cutting frame 107 via the connecting shaft 121. A suction reel drive shaft 116 for inputting power for scraping and driving the scraping reel 104 is provided over the tip portions of the left and right support arms 115. A belt transmission mechanism 122 that transmits power to the suction reel drive shaft 116 is linked to the right end portion of the suction reel drive shaft 116. A hydraulic cylinder 123 for vertically swinging the support arm 115 over the left side support arm 115 and the left side portion of the cutting frame 107 and over the right side support arm 115 and the right side portion of the cutting frame 107, respectively. (See FIG. 10) is provided.

The left and right reel frames 117 are rotationally driven in the direction of arrow A around the rotation axis X1 extending along the left and right direction of the machine body. The left reel frame 117 is supported by the left end portion of the suction reel drive shaft 116. The reel frame 117 on the right side is supported by the right end portion of the suction reel drive shaft 116. The reel frame 117 is formed in a substantially pentagonal shape when viewed from the side. The reel frame 117 includes a frame main body 124 having five arm portions 124a, and a strip-shaped plate member 125 wound around the tip portions of the five arm portions 124a.

The support bar 118 is a round bar-shaped support member that extends along the left-right direction of the machine body. Support bars 118 are provided over the tips of the five arm portions 124a on the left frame body 124 and the tips of the five arm portions 124a on the right frame body 124, respectively. That is, a plurality of support bars 118 (five in the second embodiment) are provided over the left and right reel frames 117.

The tine posture holding mechanism 120 holds the tine 119 in a posture extending downward from the support bar 118. The tine posture holding mechanism 120 is provided with an auxiliary reel frame 126 that can rotate around the rotation axis X2 parallel to the rotation axis X1 and a link 127 that links the auxiliary reel frame 126 and the support bar 118. There is. The auxiliary reel frame 126 is formed in a substantially pentagonal shape when viewed from the side. The auxiliary reel frame 126 is provided with a frame main body 128 having five arm portions 128a, and a strip-shaped plate member 129 wound around the tip portions of the five arm portions 128a. A link 127 is provided over the tip of each arm portion 128a and each support bar 118 in the frame main body 128.

By rotating the auxiliary reel frame 126 around the rotation axis X2, the support bar 118 is rotated via the link 127. As a result, the tine 119 is held in a posture of extending downward from the support bar 118 regardless of the rotation of the reel frame 117.

[Tyne of the second embodiment]
The plurality of tines 119 are attached to the support bars 118 at intervals in the left-right direction of the machine body. As the tine 119, a plurality of outer tines 130 located at both left and right ends of the support bar 118 and a plurality of inner tines 131 (corresponding to the "tine" according to the present invention) located laterally inside the outer tine 130 are used. It is equipped. The outer tine 130 is made of a round bar having an outer diameter larger than that of the inner tine 131, and has a higher bending strength than the inner tine 131.

As shown in FIGS. 15 to 18, the inner tine 131 is composed of a round bar having an outer diameter smaller than that of the outer tine 130, and has a lower bending strength than the outer tine 130. The inner tine 131 is provided with a support portion 131a, a spring portion 131b, an action portion 131c, and an extension portion 131d. The support portion 131a is supported by the support bar 118. The spring portion 131b is located below the support bar 118. The working portion 131c is provided in a state of hanging from the spring portion 131b and acts on the planted culm. The extension portion 131d extends over the support portion 131a and the spring portion 131b.

In the second embodiment, the inner tine 131 is provided with one support portion 131a, left and right spring portions 131b, left and right action portions 131c, and left and right extension portions 131d. The left and right spring portions 131b are distributed to the left and right with respect to one support portion 131a. The left extension 131d extends over one support 131a and the left spring 131b. The extension portion 131d on the right side extends over one support portion 131a and the spring portion 131b on the right side. The acting portion 131c on the left side corresponds to the spring portion 131b on the left side. The working portion 131c on the right side corresponds to the spring portion 131b on the right side. The inner tine 131 is formed in a shape symmetrical with respect to its left-right center C1.

The support portion 131a is fixed to the outer peripheral portion of the support bar 118 by bolts 132 while being placed on the upper surface of the support bar 118. The support portion 131a is provided with a recess that opens rearward so that the bolt 132 can pass in the vertical direction. The support bar 118 is formed with a hole 118a through which the bolt 132 is inserted. The bolt 132 is inserted into the hole 118a from above the support portion 131a. A flat washer 133 is externally fitted to a portion of the bolt 132 between the head 132a and the support portion 131a. A nut 134 is attached to a portion of the bolt 132 that protrudes downward from the support bar 118.

In the second embodiment, the spring portion 131b is composed of a triple-wound spring portion around the axis parallel to the support bar 118. The spring portion 131b is located below the front of the support bar 118. The inner tine 131 is formed in a shape that extends from above the support bar 118 to the spring portion 131b through the rear of the support bar 118. The working portion 131c is formed in a shape that extends from the spring portion 131b in the anterior-lower direction and bends in the rear-lower direction. The extension portion 131d is formed in a shape extending from the support portion 131a to the spring portion 131b through the rear of the support bar 118.

[Cover member of the second embodiment]
As shown in FIGS. 15 to 18, a cover member 135 is attached to the support bar 118. The cover member 135 is composed of a single elongated member that covers the plurality of tines 119. The cover member 135 has a left-right length extending over the left and right ends of the support bar 118 (specifically, left and right extending over the outermost tine 130 located at the leftmost end and the outermost tine 130 located at the rightmost end of the plurality of tines 119. Has a length). The cover member 135 includes a fitting portion 136, a first cover portion 137 (corresponding to the "cover portion" according to the present invention), and a second cover portion 138 (a "part covering the head of the bolt" according to the present invention. (Equivalent to), and are provided. The fitting portion 136 is fitted to the outer peripheral portion of the support bar 118. The first cover portion 137 is extended downward through the rear of the spring portion 131b and covers the spring portion 131b from the rear. The second cover portion 138 is provided continuously with the fitting portion 136 and covers the head 132a of the bolt 132. The fitting portion 136, the first cover portion 137, and the second cover portion 138 are each formed over the entire left and right sides of the cover member 135.

The fitting portion 136 is formed in an arc shape that follows the shape of the outer peripheral portion of the support bar 118. The fitting portion 136 is fitted to the front portion of the outer peripheral portion of the support bar 118. Specifically, the fitting portion 136 is fitted to a portion of the outer peripheral portion of the support bar 118 on the front side of the hole 118a. The upper end portion 136a of the fitting portion 136 is inserted into the gap between the front end portion of the support portion 131a and the outer peripheral portion of the support bar 118. The lower end portion 136b of the fitting portion 136 is inserted into the gap between the nut 134 and the outer peripheral portion of the support bar 118.

The first cover portion 137 is extended downward in contact with the rear portion of the inner tine 131. Specifically, the first cover portion 137 is in contact with the rear portion of the spring portion 131b and the rear portion of the extension portion 131d, and is below the lower end of the fitting portion 136 and below the lower end of the spring portion 131b. It is extended downward to the height position of. The first cover portion 137 is inclined forward downward along the rear portion of the spring portion 131b and the rear portion of the extension portion 131d in a side view.

The second cover portion 138 covers the head 132a and the support portion 131a of the bolt 132 so that the head 132a and the support portion 131a of the bolt 132 are not exposed. The second cover portion 138 is formed over the upper end portion of the fitting portion 136 and the upper end portion of the first cover portion 137.

[Support bracket of the second embodiment]
Support brackets 139 are attached to the left and right ends of the support bar 118, respectively. The support bracket 139 supports the lower portion of the first cover portion 137 that is located below the lower end of the fitting portion 136. That is, the lower portions of the cover member 135 on both the left and right sides are supported by the support brackets 139, respectively. The left support bracket 139 is attached to the support bar 118 between the left and right spring portions 131b of the inner tine 131 located at the leftmost end of the plurality of inner tines 131. The right support bracket 139 is attached to the support bar 118 between the left and right spring portions 131b of the inner tine 131 located at the rightmost end of the plurality of inner tines 131.

The support bracket 139 is made of a bent plate material. The support bracket 139 includes a mounting portion 139a, a holding portion 139b, and an engaging portion 139c (corresponding to the "second engaging portion" according to the present invention).

A hole 139d through which the bolt 132 is inserted is formed in the mounting portion 139a. A nut 140 is attached to a portion of the bolt 132 that protrudes downward from the attachment portion 139a. That is, the support bracket 139 is fixed to the outer peripheral portion of the support bar 118 together with the support portion 131a by bolts 132.

The holding portion 139b is provided so as to stand up from the front end portion of the mounting portion 139a. The pressing portion 139b presses the fitting portion 136 from the side opposite to the supporting bar 118 (front side) in a side view (cross-sectional view of the support bar 118). The upper end of the pressing portion 139b is located at a height position above the center X3 of the support bar 118 in a side view.

The engaging portion 139c is provided so as to hang down from the rear end portion of the mounting portion 139a. Here, in the cover member 135, the inner surface portion (the surface portion on the side facing the spring portion 131b) of the first cover portion 137 has an engaging portion 137a (the first one according to the present invention) over the entire left and right sides of the cover member 135. (Equivalent to one engaging part) is formed. The engaging portion 137a is formed in a groove shape in a side view. By inserting the engaging portion 139c of the support bracket 139 into the engaging portion 137a of the cover member 135, the engaging portion 137a of the cover member 135 and the engaging portion 139c of the support bracket 139 are engaged. That is, the support bracket 139 is fixed to the outer peripheral portion of the support bar 118 by bolts 132 in a state where the engaging portion 137a of the cover member 135 and the engaging portion 139c of the support bracket 139 are engaged.

[Another Embodiment of the Second Embodiment]
(2-1) In the second embodiment described above, the inner tine 131 is provided with one support portion 131a, left and right spring portions 131b, left and right extension portions 131d, and left and right action portions 131c. ing. However, the inner tine 131 may be configured to include one support portion 131a, one spring portion 131b, and one action portion 131c.

(2-2) In the second embodiment described above, the spring portion 131b is composed of a triple-wound spring portion. However, the spring portion 131b may be composed of a double-wound or single-wound spring portion.

(2-3) In the second embodiment described above, the cover member 135 is provided with the second cover portion 138. However, the cover member 135 may not be provided with the second cover portion 138.

(2-4) In the second embodiment described above, the inner tine 131 is formed in a shape that passes behind the support bar 118 and reaches the spring portion 131b. However, the inner tine 131 may be formed in a shape that passes in front of the support bar 118 and reaches the spring portion 131b.

(2-5) In the second embodiment described above, the fitting portion 136 is fitted to the front portion of the outer peripheral portion of the support bar 118. However, the fitting portion 136 may be fitted to the rear portion, the upper portion, or the lower portion of the outer peripheral portion of the support bar 118.

(2-6) In the second embodiment described above, the first cover portion 137 is extended downward in contact with the rear portion of the inner tine 131 (spring portion 131b). However, the first cover portion 137 may be extended downward in contact with the front portion of the inner tine 131 (spring portion 131b).

(2-7) In the second embodiment described above, the first cover portion 137 is extended downward to a height position below the lower end of the spring portion 131b. However, the first cover portion 137 does not have to be extended downward to a height position below the lower end of the spring portion 131b. For example, the first cover portion 137 may be extended downward to a height position above the lower end of the spring portion 131b. Alternatively, the first cover portion 137 may be extended downward to the same height position as the lower end of the spring portion 131b.

(2-8) In the second embodiment described above, the support bracket 139 is fixed to the outer peripheral portion of the support bar 118 by a bolt 132 common to the inner tine 131. However, the support bracket 139 may be fixed to the outer peripheral portion of the support bar 118 by a bolt different from the bolt 132.

(2-9) In the second embodiment described above, the support bracket 139 is attached to the support bar 118 between the left and right spring portions 131b in one inner tine 131. However, the support bracket 139 may be attached to the support bar 118 between adjacent inner tines 131.

(2-10) In the second embodiment described above, the support bracket 139 is bolted to the outer peripheral portion of the support bar 118 in a state where the engaging portion 137a of the cover member 135 and the engaging portion 139c of the support bracket 139 are engaged. It is fixed by 132. However, the cover member 135 and the support bracket 139 may not be provided with the engaging portion 137a and the engaging portion 139, respectively.

(2-11) In the second embodiment described above, the support bracket 139 is provided with a holding portion 139b. However, the support bracket 139 may not be provided with the holding portion 139b. In this case, for example, the cover member 135 is covered with a cover member divided into two front and rear parts from above the cover member 135, and the cover member is tightened in the front-rear direction so that the cover member 135 does not come off from the support bar 118. May be good.

(2-12) In the second embodiment described above, the support bracket 139 is provided. However, the support bracket 139 may not be provided.

(2-13) In the second embodiment described above, the lower portions of the cover member 135 on both the left and right sides are supported by the support brackets 139, respectively. However, instead of, or together with this, the lower portion of the cover member 135 at the left and right central portions may be supported by the support bracket 139.

(2-14) In the second embodiment described above, the cover member 135 is composed of a single elongated member covering a plurality of tines 119. However, the cover member 135 may be configured so as to be split into two or more members.

It should be noted that the configuration disclosed in the above-mentioned second embodiment (including another embodiment of the second embodiment, the same shall apply hereinafter) is applied in combination with the configuration disclosed in the other embodiment as long as there is no contradiction. It is possible. Further, the second embodiment disclosed in the present specification is an example, and the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention. The invention disclosed in the second embodiment can be used for a corn harvester as well as a whole culm harvester.

[Third Embodiment]
Hereinafter, a third embodiment of the working machine according to the present invention will be described with reference to FIGS. 19 to 28. The third embodiment shows an example of the present invention for solving the above-mentioned [third problem].

[Overall configuration of the third embodiment]
FIG. 19 shows a conventional combine harvester. The traveling body of this combine is provided with a body frame 201 and a crawler traveling device 202. In front of the traveling machine, a harvesting section 203 for harvesting planted culms in the field is provided. In the harvesting section 203, a scraping reel 204 for scraping the planted culms, a cutting blade 205 for cutting the planted culms, and an auger for laterally feeding the harvested culms in the cutting width direction, gathering them, and sending them backward. 206 and are provided.

A driving unit 207 is provided behind the harvesting unit 203. The driving unit 207 is covered with the cabin 208. A grain tank 209 for storing grains obtained by threshing is provided behind the driving unit 207. A threshing device 210 for threshing all the culms of the harvested culms is provided side by side with the grain tank 209. The grain tank 209 is configured to be rotatable around an axial core Y1 extending in the vertical direction at the rear of the grain tank 209, over an open position overhanging to the right and a closed position located next to the rear of the operation unit 207. Has been done. A feeder 211 is provided across the harvesting section 203 and the threshing device 210 to transport all the culms of the harvested culms toward the threshing device 210. The driver unit 207 is provided with a driver's seat 212 and an operation panel 213 provided with various operation tools. A driving unit 215 is provided below the operating unit 207.

[Moving unit of the third embodiment]
As shown in FIGS. 21 to 24, the driving unit 215 includes an engine 216, a radiator 217 for cooling the engine, a cooling fan 218, a fan shroud 219, and the like. The radiator 217 cools the engine 216, and the cooling fan 218 draws in outside air to cool the radiator 217. The fan shroud 219 guides outside air from the radiator 217 to the cooling fan 218.

As shown in FIGS. 20 and 22, an engine bonnet 221 is provided, and the engine bonnet 221 covers the upper part of the engine 216 to form an engine room 220. The engine bonnet 221 supports the driver's seat 212 from below and is open to the outside. The radiator 217 is provided on the lateral side of the engine 216 in the engine room 220. The cooling fan 218 is provided on the lateral inside of the radiator 217 in the engine room 220.

The lateral outside of the engine room 220 is covered with a dustproof case 222 located on the outside of the fuselage with respect to the radiator 217. A dust net 223 is provided on the lateral outer surface of the dust case 222, and the dust net 223 is breathable and blocks the passage of dust.

The rear end of the dustproof case 222 is supported by the support frame 225 so as to be swingable around the vertical axis core Y2 via the hinge 224. The support frame 225 is formed in a frame shape so as to substantially follow the outer peripheral portion of the dustproof case 222, and is fixed to the radiator frame 226. The dustproof case 222 swings around the vertical axis core Y2 to be in a closed posture that covers the outside of the engine room 220 and an open posture that opens the outside of the engine room 220 (see the virtual line in FIG. 20). It can swing over.

The cooling fan 218 draws in outside air through the dustproof case 222 in the closed position to cool the radiator 217. A fan shroud 219 is provided between the radiator 217 and the cooling fan 218, and the fan shroud 219 guides the outside air so that the cooling air from the cooling fan 218 efficiently passes through the radiator 217. The fan shroud 219 is provided so as to extend over the cooling fan 218 and the radiator 217 in a state of surrounding the outer periphery of the intake space between the cooling fan 218 and the radiator 217.

Although not shown, the transmission mechanism that transmits the power of the engine 216 to the cooling fan 218 is provided with a rotation direction switching mechanism that can switch the rotation direction of the cooling fan 218 in the forward and reverse directions. In the normal rotation state, the cooling fan 218 draws in outside air through the dustproof case 222 to cool the radiator 217. In the reverse state, the cooling fan 218 can blow the wind toward the lateral outside to blow off the dust adhering to the dust net 223 of the dustproof case 222. When the reverse operation of the cooling fan 218 is repeatedly performed, dust may adhere and accumulate on the inside of the radiator 217.

The radiator 217 has a rectangular cooling surface 217A in a side view, and the outside air drawn by the cooling fan 218 via the dustproof case 222 passes through the cooling surface 217A and exerts a cooling action. In the vicinity of the cooling surface 217A of the radiator 217, an intercooler 229 that cools the combustion air for the engine 216 by using the cooling air is provided.

As shown in FIGS. 21 and 22, the exhaust port 231 of the air cleaner 230 provided behind the driver's seat 212 and the suction port of the compression unit 232a in the supercharger 232 provided on the upper part of the engine 216 are excessive. It is connected via the turbocharger suction pipe 233. As shown in FIGS. 22 and 23, the discharge port of the compression unit 232a in the turbocharger 232 and the introduction port 229a of the intercooler 229 are connected via the supply pipe 234. The inlet 229b of the intercooler 229 and the intake portion of the engine 216 are connected via an engine suction pipe 235. The suction portion of the turbine portion 232b of the turbocharger 232 is connected to the exhaust manifold 237 of the engine 216, and the exhaust pipe 238 is connected to the exhaust portion of the turbine portion 232b of the turbocharger 232.

The upper part of the engine 216 is provided with an exhaust gas purification device 239 that purifies the exhaust gas so as to reduce the diesel particulates contained in the exhaust of the engine 216 by a collection filter (not shown). The front portion of the exhaust gas purification device 239 is supported by a connecting flange 241 provided on the exhaust pipe 238 via an L-shaped support bracket 240 in a side view.

The support bracket 240 holds the position of the connection point of the supply pipe 234 to the turbocharger 232. As shown in FIG. 28, a mounting plate 242 along the front-rear direction is integrally provided at the right end of the support bracket 240. Both sides of the holding member 243 that sandwiches and holds the supply pipe 234 are bolted to the mounting plate 242. The supply pipe 234 is gripped by the holding member 243 and is held so that the supply pipe 234 does not come off due to frictional force.

The support structure of the radiator 217 will be described. As shown in FIGS. 21 to 25, the radiator 217 is supported by the radiator frame 226 as a support frame. The radiator frame 226 covers the intake space between the radiator 217 and the dustproof case 222, and is formed in a square frame shape along the outer periphery of the radiator 217 so that the outside air passing through the dustproof case 222 is guided to the cooling surface 217A. Has been done. That is, as shown in FIG. 25, the radiator frame 226 has a lower frame-shaped portion 245, front and rear frame-shaped

portions

246 and 247, and an upper frame-shaped portion 248 on the outer periphery of the radiator 217. It is provided in a rectangular shape in a side view along the line. The bottom of the radiator frame 226 is supported by the airframe frame 201.

The radiator frame 226 is provided with a mounting support portion 249, and the mounting support portion 249 protrudes from the lower frame-shaped portion 245 toward the lateral inside of the machine body. The mounting support portion 249 is composed of a plate-like body having a horizontal posture that is long in the front-rear direction and narrow in the left-right direction. A receiving portion 250 is provided at the front end portion of the mounting support portion 249, and the receiving portion 250 prevents the radiator 217 mounted on the mounting support portion 249 from coming off forward. The rear end portion of the mounting support portion 249 is not provided with a member for receiving and blocking, and the rear end portion of the mounting support portion 249 is open. Therefore, the operator can pull out the radiator 217 rearward. A reinforcing rib 251 is provided on the lower side of the rear end portion of the mounting support portion 249.

As shown in FIGS. 24 and 25, two engaging holes 253 are formed in the mounting support portion 249. The two locking pins 252 project downward from the lower part of the radiator 217 at two front and rear positions. The radiator 217 is mounted and supported on the mounting support portion 249 by each of the two locking pins 252 entering the engaging hole 253 to prevent the radiator 217 from being displaced. The upper part of the radiator 217 is connected to the upper frame-shaped portion 246 of the radiator frame 226 via the connecting bracket 254 at two front and rear positions.

As shown in FIG. 21, a large opening 255 is formed at the rear of the engine room 220 so that the radiator 217 can be pulled out and removed rearward. When the operator removes the radiator 217 for maintenance work, the radiator 217 supported by the mounting support 249 is rearwarded from the rear opening 255 of the engine room 220, as shown by a virtual line in FIG. Can be slid towards. At this time, the radiator 217 slides backward along the cooling surface 217A on the upper surface of the mounting support portion 249. When the operator removes the radiator 217, it is necessary to open the grain tank 209 to the open position, remove the cooling water circulation pipe 256, and disconnect the connecting bracket 254 in advance. Further, the operator moves the radiator 217 while sliding it with respect to the mounting support portion 249 in a state where the locking pin 252 and the engaging hole 253 are disengaged.

As shown in FIGS. 24 and 25, the lower frame-shaped portion 245 of the radiator frame 226 is provided with a cleaning port 257 as an opening that penetrates vertically, and a lid 258 that can open and close the cleaning port 257. There is. The frame-shaped portion 245 includes a vertical surface portion 245a for fixing the support frame 225 of the dustproof case 222 on the outer side in the left-right direction, and a vertical surface portion 245b for fixing the mounting support portion 249 on the inner and inner sides in the left-right direction. It has a U-shaped cross section when viewed in the anteroposterior direction. Therefore, if dust accumulates inside the lower frame-shaped portion 245, it is difficult to clean it. Therefore, the cleaning port 257 is configured to remove dust.

As shown in FIG. 26, the lid body 258 inserts and engages the bifurcated insertion portion 259 provided at the rear end portion with the inner edge of the rear end of the cleaning port 257, and also engages with the front-rear central portion of the lid body 258. And the front end portion are bolted to the peripheral edge portion of the cleaning port 257 of the lower frame-shaped portion 245. The operator can easily remove the lid 258 by releasing the bolt connection.

Next, the fan shroud 219 will be described. The fan shroud 219 is provided so as to extend over the cooling fan 218 and the radiator 217 in a state of surrounding the outer periphery of the intake space between the cooling fan 218 and the radiator 217. As shown in FIGS. 25 and 27, the fan shroud 219 has an upper portion 219a covering the upper side of the intake space, a lower portion 219b covering the lower side of the intake space, and a rear portion covering the rear side of the intake space. It includes a 219c, a front side portion 219d that covers the front side of the intake space, and a vertical wall portion 219e that covers the side surface on the left side (cooling fan 218 side) of the intake space. The rear side corresponds to the front side in the extraction direction of the radiator 217, and the rear side portion 219c corresponds to the "front side portion" that covers the front side in the extraction direction of the intake space. The front side portion 219d corresponds to the "back side portion" that covers the back side of the intake space in the removal direction.

The upper portion 219a is provided in a horizontal posture. The lower portion 219b is provided in an inclined posture which is located on the upper side toward the left side. The rear side portion 219c is provided in an inclined posture which is located on the front side toward the left side. The front side portion 219d is provided in an inclined posture which is located on the rear side toward the left side. The right end of the fan shroud 219 is formed in a rectangular shape surrounding the outer periphery of the radiator 217, and the intake space surrounded by the fan shroud 219 faces the left side (cooling fan 218 side) along the front-rear direction and the vertical direction. The width is getting narrower. With this configuration, the cooling air passing through the intake space is satisfactorily guided to the cooling fan 218 side.

The vertical wall portion 219e is formed with an intake opening 260 in which intake is performed by the cooling fan 218. The intake opening 260 is circular and is formed to have a large diameter close to the substantially vertical width of the vertical wall portion 219e. A peripheral wall portion 261 projecting toward the cooling fan 218 is formed at the inner edge portion of the intake opening 260. The cooling fan 218 is provided so as to enter the peripheral wall portion 261. The intake opening 260 corresponds to an "opening" formed on the lateral inner side of the dustproof case 222.

To add an explanation, the vertical wall portion 219e of the fan shroud 219 is divided into a left vertical wall portion 219e1 located on the left side and a right vertical wall portion 219e2 located on the right side at substantially the center position on the left and right. The left vertical wall portion 219e1 corresponds to the "front vertical wall portion" located on the front side in the removal direction. Further, the right vertical wall portion 219e2 corresponds to the "back side vertical wall portion" located on the back side in the removal direction.

Of the fan shroud 219, the upper portion 219a, the lower portion 219b, and the rear portion 219c are integrally formed. The left vertical wall portion 219e1 is screwed and fixed to the upper portion 219a, the lower portion 219b, and the rear portion 219c that are integrally formed. The right vertical wall portion 219e2 and the front side portion 219d are integrally formed.

Therefore, in the fan shroud 219, a part of the divided body B1 is formed by the upper portion 219a, the lower portion 219b, the rear side portion 219c, and the fixed left vertical wall portion 219e1, and the right vertical wall is integrally formed. The other divided body B2 is composed of the portion 219e2 and the front side portion 219d, and is configured to be divisible into two divided bodies B1 and B2 in the circumferential direction.

Flange connecting portions 263 capable of bolt connection are formed at two locations above and below the boundary 262 between the left vertical wall portion 219e1 and the right vertical wall portion 219e2 of the peripheral wall portion 261. The flange connecting portion 263 is configured to be abutted in the front-rear direction so that bolts can be connected and disconnected along the front-rear direction. Although not shown, the portion where the two divided bodies B1 and B2 overlap is fixed by a plurality of screws. These multiple screws are also removable.

A part of the split body B1 is supported by the radiator 217, and the other split body B2 is separated from the radiator 217. Mounting brackets 264 are provided on the upper surface of the upper portion 219a and the lower surface of the lower portion 219b at intervals in the front-rear direction. With the fan shroud 219 in the proper mounting position, each mounting bracket 264 is bolted to a mounting portion 265 provided on the radiator 217. Although the other split body B2 is separated from the radiator 217, it can be connected to a part of the split body B1 attached to the radiator 217 by the upper and lower flange connecting portions 263.

A part of the split body B1 can be integrally removed rearward along the removal direction of the radiator 217. When removing a part of the divided body B1, if the connection by the flange connecting portions 263 at the upper and lower two positions is released, the other divided body B2 falls sideways on the spot because there is nothing to be supported. Then, a part of the divided body B1 can be removed and removed rearward without interfering with the cooling fan 218. When the radiator 217 is removed, the operator can also remove a part of the divided body B1 at the same time. Further, the operator can remove only a part of the divided body B1 if the connection between the part of the divided body B1 and the radiator 217 is released.

[Another Embodiment of the Third Embodiment]
The present invention is not limited to the configuration exemplified in the above-mentioned third embodiment, and the following, typical alternative embodiments of the present invention will be exemplified.

(3-1) In the third embodiment described above, the left vertical wall portion 219e1 is screwed and fixed, but the left vertical wall portion 219e1 is together with the upper portion 219a, the lower portion 219b and the rear portion 219c. It may be integrally formed.

(3-2) In the third embodiment described above, the right vertical wall portion 219e2 and the front side portion 219d are integrally formed, but instead of this configuration, the right vertical wall portion 219e2 and the front side portion 219d are formed. It may be detachably connected.

(3-3) In the third embodiment described above, the other split body B2 is separated from the radiator 217, but instead of this configuration, the other split body B2 is supported by the radiator 217. May be.

(3-4) In the third embodiment described above, the fan shroud 219 is divided into two parts, a part B1 and another B2, but instead of this structure, three or more parts are used. It may be configured to be divided into divided bodies.

(3-5) In the third embodiment described above, the cleaning port 257 (opening) penetrating vertically is formed in the lower frame-shaped portion 245, but instead of this configuration, the cleaning port 257 is formed. It may be configured not to be used.

The configuration disclosed in the above-mentioned third embodiment (including another embodiment of the third embodiment, the same shall apply hereinafter) shall be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. It is possible. Further, the third embodiment disclosed in the present specification is an example, and the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention. The invention disclosed in the third embodiment can be applied to harvesters such as ordinary combine harvesters and head-feeding combine harvesters, and agricultural work machines such as tractors and rice transplanters, and works not only for agricultural work machines but also for construction machines and the like. It can also be applied to machines.

[First Embodiment]
3: Harvesting section (working equipment)
4: Threshing device (working device)
5: Glen tank (working equipment)
6: Grain discharge device (working device)
8: Engine (drive source)
23: First transmission belt (transmission belt)
23A: Threshing clutch (working clutch)
52: Clutch operation unit 53: Accelerator operator 55: Rotation speed detection sensor 57: Notification unit R: Engine rotation speed (rotation speed)
RL: Threshold Rd: First change rate Ru: Second change rate Tn: Notification timer (preset set time from the start of transmission switching operation)
Tw1: First wait timer (first interval time)
Tw2: Second wait timer (second interval time)
[Second Embodiment]
103: Cutting part 104: Scraping reel 117: Reel frame 118: Support bar (support member)
131: Inner tine (tine)
131a: Support part 131b: Spring part 131c: Acting part 132: Bolt 132a: Bolt head 135: Cover member 136: Fitting part 137: First cover part (cover part)
137a: Engaging part (first engaging part)
138: Second cover (the part that covers the head of the bolt)
139: Support bracket 139b: Holding part 139c: Engaging part (second engaging part)
X1: Center of rotation [third embodiment]
216: Engine 217: Radiator 218: Cooling fan 219: Fan shroud 219a: Upper part 219b: Lower part 219c: Rear part (front part)
219d: Front side part (back side part)
219e: Vertical wall part 219e1: Left vertical wall part (front side vertical wall part)
219e2: Right vertical wall part (back side vertical wall part)
220: Engine room 221: Engine bonnet 222: Dustproof case 226: Support frame 243: Lower frame-shaped part 255: Opening (opening where the radiator can be removed rearward)
257: Cleaning port (opening that penetrates up and down)
258: Lid body 260: Intake opening (opening)
261: Peripheral wall 262: Boundary

Claims

With a drive source that can be driven to rotate
A work device driven by the drive source and
A transmission belt capable of transmitting power from the drive source to the work device,
A belt tension type work clutch that can be switched between a transmission state in which power is transmitted to the transmission belt and a non-transmission state in which power is not transmitted to the transmission belt.
Based on the on-control signal which is a control signal related to the on-operation of the work clutch and the off control signal which is the control signal related to the off-operation of the work clutch, the work clutch is put into the transmission state and the non-transmission state. A clutch operation unit that can be switched and
A rotation speed detection sensor capable of detecting the rotation speed of the drive source is provided.
When the clutch operating unit detects the on-control signal and the rotation speed is equal to or lower than a preset threshold value, the clutch operating unit switches the transmission of the working clutch in the non-transmission state to the transmission state. Perform the operation immediately
When the rotation speed is higher than the threshold value when the clutch operation unit detects the ON control signal, the clutch operation unit sets the rotation speed of the drive source so that the rotation speed is equal to or less than the threshold value. A work vehicle that controls the first rotation speed to be lowered and also performs the transmission switching operation in a state where the rotation speed is equal to or less than the threshold value.
When the transmission switching operation is completed in a state where the first rotation speed control is performed and the rotation speed is equal to or lower than the threshold value, the clutch operation unit is driven so that the rotation speed becomes higher than the threshold value. The work vehicle according to claim 1, wherein the second rotation speed control for increasing the rotation speed of the source is performed.
An accelerator operation tool for setting the number of revolutions is provided.
The work vehicle according to claim 2, wherein the clutch operation unit controls the second rotation speed so that the rotation speed reaches the set rotation speed of the accelerator operating tool.
The first change rate, which is the rate of change of the rotation speed per unit time in the first rotation speed control, and the second change rate, which is the change rate of the rotation speed per unit time in the second rotation speed control, Is set,
The work platform according to claim 2 or 3, wherein the first rate of change is smaller than the second rate of change.
The work platform according to claim 4, wherein the first rate of change is constant regardless of the number of revolutions at the time when the clutch operating unit detects the on-control signal.
The first interval time, which is the time from the completion of the first rotation speed control to the start of the transmission switching operation, and the second interval time, which is the time from the completion of the transmission switching operation to the start of the second rotation speed control. And are set,
The work platform according to any one of claims 2 to 5, wherein the second interval time is longer than the first interval time.
A notification unit capable of notifying the transmission switching operation is provided.
The notification unit notifies the transmission switching operation over a time when the clutch operation unit detects the ON control signal and a time when a preset set time has elapsed from the start of the transmission switching operation. The work vehicle according to any one of claims 1 to 6 to be continued.
The set time is set to a time point before the completion of the transmission switching operation.
The work vehicle according to claim 7, wherein the notification unit stops notification when the set time has elapsed.
It is equipped with a cutting section that cuts the planted crops while scraping them.
A harvester equipped with a scraping reel for scraping planted crops in the cutting section.
The scraping reel is provided with a plurality of left and right reel frames that are rotationally driven around a rotation axis extending along the left and right directions of the machine, and a plurality of rod-shaped supports extending along the left and right directions of the machine. A member and a plurality of tines attached to the support member at intervals in the left-right direction of the machine body are provided.
The tine has a support portion supported by the support member, a spring portion located below the support member, and an action portion provided in a state of hanging from the spring portion and acting on the planted crop. Be prepared,
A cover member having a fitting portion fitted to the outer peripheral portion of the support member and a cover portion extending downward through the rear of the spring portion and covering the spring portion from the rear is provided. Harvester.
The support portion is fixed to the outer peripheral portion of the support member by bolts.
The harvester according to claim 9, wherein the cover member is provided with a portion continuous with the fitting portion and covers the head of the bolt.
The tine is formed in a shape that passes behind the support member and reaches the spring portion.
The fitting portion is fitted to the front portion of the outer peripheral portion of the support member.
The harvester according to claim 9 or 10, wherein the cover portion is extended downward in contact with the rear portion of the tine.
The harvester according to claim 11, wherein the cover portion is extended downward to a height position below the lower end of the spring portion in a state of being in contact with the rear portion of the spring portion.
The cover portion is extended downward to a height position below the lower end of the fitting portion.
The harvester according to claim 11 or 12, wherein a support bracket for supporting a lower portion of the cover portion located below the lower end of the fitting portion is provided.
The support portion is fixed to the outer peripheral portion of the support member by bolts.
The harvester according to claim 13, wherein the support bracket is fixed to the outer peripheral portion of the support member together with the support portion by the bolt.
The cover member is provided with a first engaging portion, and the support bracket is provided with a second engaging portion.
The harvester according to claim 14, wherein the support bracket is fixed to the outer peripheral portion of the support member by the bolt in a state where the first engaging portion and the second engaging portion are engaged.
The harvester according to any one of claims 13 to 15, wherein the support bracket is provided with a pressing portion that presses the fitting portion from the side opposite to the supporting member in a cross-sectional view of the supporting member.
The cover member is a long member that covers a plurality of the tines.
The harvester according to any one of claims 13 to 16, wherein the lower portions on both the left and right sides of the cover member are supported by the support brackets, respectively.
In the tine, one support portion, left and right spring portions distributed to the left and right with respect to the one support portion, and left and right action portions corresponding to the left and right spring portions are provided. The harvester according to any one of claims 9 to 17, which is provided.
The harvester according to claim 18, wherein a support bracket that supports the cover portion is attached to the support member between the left and right spring portions.
The spring portion is located below the front of the support member and is located below the front.
The harvester according to any one of claims 9 to 19, wherein the cover portion is inclined forward and downward along the rear portion of the spring portion in a side view.
An engine bonnet that covers the engine to form an engine room, supports the driver's seat from below, and is open to the outside.
In the engine room, a radiator for cooling the engine provided on the lateral side of the engine and
A dustproof case provided on the lateral side of the radiator to block the lateral side of the radiator in a state of allowing ventilation and blocking the passage of dust.
A cooling fan provided on the lateral inside of the radiator and drawing outside air through the dustproof case to cool the radiator.
A fan shroud that is provided so as to surround the cooling fan and the radiator so as to surround the outer periphery of the intake space between the cooling fan and the radiator and guides outside air from the radiator to the cooling fan.
A support frame provided so as to extend over the opening formed on the lateral inner side of the dustproof case and the radiator and to support the radiator is provided.
The radiator is supported by the support frame so that it can slide backward along the cooling surface.
A working machine in which an opening is formed in the rear part of the engine room so that the radiator can be pulled out and removed rearward.
The working machine according to claim 21, wherein the fan shroud is configured to be able to be divided into a plurality of divided bodies in the circumferential direction.
The fan shroud according to claim 22, wherein a part of the plurality of divided bodies is supported by the radiator, and the other divided body of the plurality of divided bodies is separated from the radiator. Working machine.
The working machine according to claim 23, wherein the part of the divided body is detachably supported by the radiator and can be detached rearward along the removing direction of the radiator.
Of the fan shroud, an upper portion that covers the upper side of the intake space, a lower portion that covers the lower side of the intake space, and a front portion that covers the front side of the intake space in the removal direction. The working machine according to claim 24, which is removable.
The working machine according to claim 25, wherein the upper portion, the lower portion, and the front side portion are integrally formed.
Of the fan shroud, the vertical wall portion covering the side surface of the intake space on the cooling fan side is located on the front side vertical wall portion located on the front side in the removal direction and on the back side in the removal direction. It is divided into the vertical wall part on the back side,
The front vertical wall portion can be integrally removed and removed rearward from the upper portion, the lower portion, and the front portion.
The working machine according to claim 26, wherein the back side vertical wall portion is integrally provided with a back side portion that covers the back side of the intake space in the removal direction.
An intake opening for intake by the cooling fan is formed in the vertical wall portion.
A peripheral wall portion protruding toward the cooling fan is formed on the outer peripheral portion of the intake opening.
The cooling fan is provided so as to enter the peripheral wall portion.
The boundary between the front vertical wall portion and the back vertical wall portion of the peripheral wall portion is connected so as to be disconnectable.
The working machine according to claim 27, wherein the upper portion, the lower portion, and the front side portion are supported by the radiator.
The support frame is formed in a square frame shape along the outer circumference of the radiator, and an opening that penetrates vertically is formed in the lower frame shape portion.
The working machine according to any one of claims 21 to 28, which is provided with a lid capable of opening and closing the opening.