Work vehicle

Abstract

It was requested that the airtightness of the cabin interior space be improved. [Solution] The system comprises an operating unit 7, a cabin 8 covering the operating unit 7, an operating lever RE provided inside the cabin 8, an operated device HS provided outside the cabin 8, an operating rod RO connected to the operated device HS, and a conversion mechanism KI connected to the operating lever RE and the operating rod RO, which converts the movement of the operating lever RE into the movement of the operating rod RO. A through hole is formed in the floor 8A of the cabin 8, the operating rod RO is positioned to pass through the floor 8A of the cabin 8 through the through hole, and the conversion mechanism KI is positioned inside the cabin.

Description

Technical Field

[0001] The present invention relates to work vehicles such as combines, tractors, rice transplanters, etc.

Background Art

[0002] In a combine, which is an example of a work vehicle, for example, as described in Patent Document 1, a plurality of operation levers are provided inside a cabin that covers the driver's cab, and as an operated device operated by the operation lever, for example, a hydrostatic continuously variable transmission, a parking brake, etc. are provided, and the operation lever and an operation rod for operating the operated device are connected via an operation linkage mechanism. The operation lever is provided on the side panel, and the driver's space where the operator is present and the space where the operation linkage mechanism is present are partitioned by the side panel.

[0003] Also, in this type of combine, for example, as described in Patent Document 2, there is a combine provided with a cabin that covers the upper part of the driver's cab in order to improve the working environment of the operator.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a work vehicle having an operation linkage mechanism as described above, it is necessary to form a long insertion hole in the side panel to allow the operation of the operation lever. As a result, when a work vehicle having an operation linkage mechanism as described above is configured to include a cabin, it is difficult to improve the airtightness of the space inside the cabin, and there are disadvantages such as a decrease in functions such as dust intrusion and noise reduction.

[0006] Therefore, there was a demand for a way to improve the airtightness of the space inside the cabin. [Means for solving the problem]

[0007] The characteristic configuration of the work vehicle according to the present invention is that it comprises an operator's unit, a cabin covering the operator's unit, an operating lever provided inside the cabin, an operated device provided outside the cabin, an operating rod connected to the operated device, and a conversion mechanism connected to the operating lever and the operating rod, which converts the movement of the operating lever into the movement of the operating rod, wherein a through hole is formed in the floor of the cabin, the operating rod is positioned to penetrate the floor of the cabin through the through hole, and the conversion mechanism is positioned inside the cabin.

[0008] According to the present invention, since the operating rod is positioned to penetrate the cabin floor through a through-hole, the operating lever and conversion mechanism are located within the cabin's internal space. Because the operating rod transmits operating information to the operated device by being pushed and pulled in the longitudinal direction, there is no need to form a large opening where the operating rod penetrates, making it easier to ensure airtightness. Therefore, it is possible to improve the airtightness of the space inside the cabin.

[0009] In the present invention, it is preferable that the operating rod and the through-holes are provided in multiple quantities, with one operating rod passing through one of the through-holes.

[0010] With this configuration, since one through-hole is formed for each of the multiple operating rods, it is easier to ensure airtightness at the insertion point of each operating rod, thereby improving the overall airtightness of the space inside the cabin.

[0011] In the present invention, it is preferable that a cover member is provided which is positioned on the underside of the cabin floor and covers the through hole and the operating rod.

[0012] With this configuration, by covering the area exposed by the through-hole with a cover member, it is possible to improve the airtightness of the cabin floor while enabling operation by the operating rod.

[0013] In the present invention, it is preferable that the operating lever is located on the side panel of the operating unit.

[0014] With this configuration, the control lever is located on the side panel, making it easy for the driver seated in the driver's seat to operate the control lever.

[0015] In the present invention, it is preferable that the operated device is located below the operating unit.

[0016] With this configuration, the controllable device located below the driver's seat can be properly operated by operating the control lever located inside the cabin.

[0017] In the present invention, the operated device is preferably a transmission, a hydrostatic continuously variable transmission, or a parking brake.

[0018] With this configuration, the operation of the control lever allows for the proper operation of the transmission's drive switching mechanism, the gear shifting operation of the hydrostatic continuously variable transmission, or the operation of the parking brake. [Brief explanation of the drawing]

[0019] [Figure 1] This is a side view of the entire combine harvester. [Figure 2] This is an overall plan view of the combine harvester. [Figure 3] Plan view of the driver's compartment. [Figure 4] This is a diagram showing the power transmission configuration. [Figure 5] This is a longitudinal cross-sectional side view of the driver's compartment. [Figure 6] This is a front cross-sectional view of the driver's compartment. [Figure 7] It is a side view showing the main transmission operating system and the brake operating system. [Figure 8] It is a side view showing the auxiliary transmission operating system.

Embodiments for Carrying out the Invention

[0020] Hereinafter, an embodiment of a general - type combine, which is an example of a work vehicle according to the present invention, will be described based on the drawings. The present invention is not limited to the following embodiments, and various modifications are possible without departing from the gist thereof.

[0021] In the following description, unless otherwise specified, the direction of arrow F in the figure is defined as "front", the direction of arrow B as "rear", the direction of arrow L as "left", and the direction of arrow R as "right". The direction of arrow U in the figure is defined as "up", and the direction of arrow D as "down".

[0022] 〔Overall Configuration〕 Figs. 1 and 2 show a general - type combine for harvesting rice, wheat, etc. This combine includes a traveling body equipped with a pair of left - and - right crawler - type traveling devices 2 at the lower part of the machine body frame 1. At the front part of the traveling body, a cutting and conveying part 3 for cutting the standing grain straws to be harvested and conveying them backward is connected so as to be swingable up and down around the horizontal axis core P1. And on the machine body frame 1, there are provided a threshing device 4 for performing handling processing on the cut grain straws from the cutting and conveying part 3 and also performing sorting processing on the threshed products obtained by the handling processing, a grain tank 5 for storing the grains from the threshing device 4, a grain discharging device 6 for discharging the grains stored in the grain tank 5 to the outside of the machine, a driving part 7 where the driver rides to perform driving operations, and the like.

[0023] The driving part 7 is located on the right side of the front part of the machine body and is covered by a cabin 8. A grain tank 5 is located behind the driving part 7. 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 provided side by side in the left - right direction. And below the driving part 7, a driving engine 9 is provided, and the power of the engine 9 is transmitted to each part.

[0024] The harvesting and conveying unit 3 is comprised of a rotating reel 10 that sweeps the planted grain stalks to be harvested towards the rear, a clipper-type harvesting device 11 that cuts the base of the planted grain stalks to be harvested, a lateral auger 12 that gathers the cut grain stalks at a predetermined location in the center of the left-right direction and sends them towards the rear, and a feeder 13 that conveys the harvested grain stalks toward the threshing device 4. The harvesting and conveying unit 3 is supported by a lifting hydraulic cylinder 14 so that it can swing up and down around a horizontal axis P1.

[0025] The threshing device 4, though not described in detail here, is configured such that, in the upper part of the internal space enclosed by the left and right side walls and the top plate, a threshing drum 15 that rotates around a front-to-back axis threshes the harvested grain stalks conveyed from the feeder 13, and then separates the threshed material into grain, second-grade material, and straw waste. The grain is stored in the grain tank 5. The second-grade material is returned to the inside of the threshing device 4, and the straw waste and other materials are discharged to the rear of the machine. After the harvesting operation is completed, the grain stored in the grain tank 5 is discharged outside the machine by a well-known screw conveyor type grain discharge device 6.

[0026] [Transmission structure] Next, I will explain the transmission structure. As shown in Figure 4, the power from the engine 9 is transmitted to the main transmission 18, which consists of a hydrostatic continuously variable transmission, via a belt transmission mechanism 17 equipped with a first transmission belt 16. After being shifted in the main transmission 18, the power is transmitted to the transmission 19 located on the front side of the engine 9. The transmission 19 is equipped with a gear-meshing auxiliary transmission 20 and a turning mechanism (not shown), and the power transmitted to the transmission 19 is transmitted to the left and right running gears 2 via an internal transmission mechanism of the transmission 19. The transmission 19 also has a built-in brake mechanism 21 that provides braking force to the left and right running gears 2.

[0027] The power from the engine 9 is intermittently transmitted to the rotating shaft 25 of the winnowing machine 24 via a belt-tension type threshing clutch 23 equipped with a second transmission belt 22. Power is also transmitted from the left end of the rotating shaft 25 of the winnowing machine 24 to the various components of the threshing apparatus 4 via a third transmission belt 26.

[0028] Power is transmitted from the left end of the rotating shaft 25 of the winnowing machine 24 to the threshing drum 15 of the threshing device 4 via the fourth transmission belt 27, the left-right oriented intermediate transmission shafts 28, and the bevel gear transmission mechanism 29. Power is transmitted from the intermediate transmission shaft 28 to the harvesting input shaft 32 via a belt-tension type harvesting clutch 31 equipped with a fifth transmission belt 30, and from this harvesting input shaft 32 to each part of the harvesting conveying section 3. In addition, power from the engine 9 is transmitted to the grain discharge device 6 via a belt-tension type discharge clutch 34 equipped with a sixth transmission belt 33.

[0029] [Driver's Unit] As shown in Figure 3, the driver's unit 7 is equipped with a cross-shaped swing lever 35 that can be operated in a cross shape in the forward / backward and left / right directions, and a display panel 36 that displays various information, located in front of the driver's seat 7A.

[0030] A side panel 37 is provided to the side of the driver's seat 7A. The front of this side panel 37 is equipped with a work clutch lever 38 for engaging and disengaging the threshing clutch 23 and the harvesting clutch 31, a main transmission lever 39 for operating the main transmission 18, and a sub-transmission lever 40 for operating the sub-transmission 20. When the work clutch lever 38 is operated to the first working position, the threshing clutch 23 is switched to the engaged state, allowing threshing work to be performed. When the work clutch lever 38 is operated to the second working position, the harvesting clutch 31 is engaged in addition to the threshing clutch 23, allowing harvesting work to be performed. The work clutch lever 38, the main transmission lever 39, and the sub-transmission lever 40 are inserted through guide holes provided in the side panel 37, but these guide holes are not equipped with any materials (such as rubber plates) to maintain airtightness.

[0031] The rear side of the side panel 37 is equipped with an accelerator operation switch 41, a discharge switch 42 for switching the operating state of the grain discharge device 6, a posture change switch 43 for changing the posture of the grain discharge device 6, and the like. A foot pedal 44 is provided at the bottom of the side panel 37.

[0032] The harvesting and conveying unit 3 can be raised and lowered by swinging the cross-shaped swing lever 35 along the front-rear direction. Although not shown in the figures, when a detection sensor provided at the base end of the cross-shaped swing lever 35 detects the forward-rear swing operation of the cross-shaped swing lever 35, a control device (not shown) controls the lifting hydraulic cylinder 14. When the cross-shaped swing lever 35 swings backward, the harvesting and conveying unit 3 rises, and when the cross-shaped swing lever 35 swings forward, the harvesting and conveying unit 3 lowers.

[0033] The vehicle body can be turned by swinging the cross-shaped swing lever 35 along the left-right direction. Although not shown in the diagram, the hydraulic steering mechanism provided in the transmission 19 and the cross-shaped swing lever 35 are linked together via an operating wire (not shown). Swinging the cross-shaped swing lever 35 to the right or left allows the vehicle body to be turned to the right or left in conjunction with the pushing and pulling operation of the operating wire.

[0034] Since the operation information for each of the switches described above is transmitted to the control device via electrical wiring, and the rotation operation is transmitted via an operating wire, there is little risk of reducing the airtightness of the cabin 8. In contrast, in places where operation information is transmitted to the operated device by mechanical linkage operations as described later, there is a risk of reducing the airtightness of the cabin 8.

[0035] [Operational linkage mechanism] This combine harvester includes an operating lever RE located inside the cabin 8, an operated device HS located outside the cabin 8, an operating rod RO connected to the operated device HS, and a conversion mechanism KI connected to the operating lever RE and the operating rod RO, which converts the movement of the operating lever RE into the movement of the operating rod RO. A through-hole AL is formed in the floor of the cabin 8, and the operating rod RO is positioned to penetrate the floor 8A of the cabin 8 through the through-hole AL. The conversion mechanism KI is located inside the cabin 8.

[0036] Multiple operating rods RO and through holes AL are provided, with one operating rod RO passing through each through hole AL. In addition, multiple operable devices HS are provided on the outside of the cabin 8. Specifically, the operable devices HS include a transmission 19 that houses a sub-transmission 20, and a main transmission 18 consisting of a hydrostatic continuously variable transmission. These operable devices HS are provided below the driver's compartment 7 and below the floor 8A of the cabin 8.

[0037] Specifically, the operating lever RE includes a main shift lever 39 for shifting the main transmission 18, a sub-shift lever 40 for shifting the sub-transmission 20, and a brake lever 45 operated by the pedal 44.

[0038] As shown in Figures 5, 6, and 7, the main gear shift lever 39 is supported on the support frame 46 of the cabin 8 so as to be able to swing in the front-rear direction around the horizontal axis P2. A pivot operating member 47 is provided at the pivot base end of the main gear shift lever 39, which rotates integrally with the swing operation of the main gear shift lever 39, and the upper end of the main gear shift operating rod 48 is pivotally connected to the front end of the pivot operating member 47. The lower end of the main gear shift operating rod 48 is linked in conjunction with the gear shift arm 18a of the main transmission 18.

[0039] When the main shift lever 39 swings forward from the neutral position, the rotating operating member 47 swings counterclockwise in Figure 7, causing the main shift operating rod 48 to slide downward and increasing the speed of the main transmission 18 in the forward position. When the main shift lever 39 swings backward from the neutral position, the rotating operating member 47 swings clockwise in Figure 7, causing the main shift operating rod 48 to slide upward and increasing the speed of the main transmission 18 in the reverse position. The linked configuration of the rotating operating member 47 and the main shift operating rod 48 corresponds to the conversion mechanism KI.

[0040] As shown in Figures 5, 6, and 8, the auxiliary transmission lever 40 is supported on the support frame 46 so as to be able to swing in the front-rear direction around the horizontal axis P3. A pivot shaft 49 that rotates integrally with the pivot base end of the auxiliary transmission lever 40 is provided, and a swing arm 50 that can swing integrally with the pivot shaft 49 is provided. An auxiliary transmission operating rod 51 is pivotally connected to the swing end of the swing arm 50. The auxiliary transmission operating rod 51 slides vertically in conjunction with the front-rear swing of the auxiliary transmission lever 40, and is linked to change the speed of the auxiliary transmission device 20. The linkage configuration of the swing arm 50 and the auxiliary transmission operating rod 51 corresponds to the conversion mechanism KI.

[0041] In this embodiment, in addition to the main transmission 18 and the auxiliary transmission 20, a brake mechanism 21 is provided. The brake mechanism 21 is located inside the transmission 19 and is configured to switch to a braking state by pressing a pedal 44 located at the bottom of the side panel 37. The pedal 44 is supported at the front end of a brake lever 45 that can swing like a balance beam around a horizontal axis P4 in the middle of the front-rear part of the support frame 46. The upper part of a brake operating rod 52 is pivotally connected to the rear end of the brake lever 45.

[0042] The brake lever 45 is biased to swing clockwise in Figures 5 and 7 by the biasing force of the spring 53. When the brake lever 45 swings counterclockwise against the biasing force due to the pedal being pressed, the brake operating rod 52 slides upward, operating the brake mechanism 21 into a braking state. As a result, the left and right running gears 2 are braked. The brake lever 45 is configured to be held in position in the braking state by a locking device (not shown). Therefore, the brake mechanism 21 functions as a parking brake. The position holding of the locking device can be released by manual operation. The lower part of the brake operating rod 52 is linked to the brake mechanism 21. The linking mechanism between the brake lever 45 and the brake operating rod 52 corresponds to the conversion mechanism KI.

[0043] The brake lever 45 is equipped with a lateral locking pin 56. A pair of neutral return operating links 57 are provided to link the brake lever 45 and the main gear shift lever 39. The lower end of each operating link 57 is engaged with the locking pin 56 via an elongated hole 58 that is long in the vertical direction. The upper end of each operating link 57 is pivotally connected to the front and rear portions of the rotating operating member 47, respectively.

[0044] When the brake lever 45 is not operated, the pair of operating links 57 can slide freely within the range of the elongated hole 58, allowing gear shifting by the main gear lever 39. On the other hand, when the pedal 44 is pressed and the brake lever 45 is operated, even if the main gear lever 39 is operated to either the forward or reverse operating range and is held in place by a friction holding mechanism (not shown), the operating links 57 can forcibly return it to the neutral position, switching the main transmission 18 to the neutral state.

[0045] [Layout configuration] As shown in Figure 6, the floor 8A of the cabin 8 extends not only to the floor portion of the driving space but also to the lower part of the side panel 37 in the left-right direction. As shown in Figures 3 and 6, the cabin 8 has an interior space enclosed by the left and right side portions 8B and 8C including the glass portion GL and the door portion DR, the ceiling portion 8D, the front wall portion 8E including the windshield, and the floor 8A, etc. In other words, the main transmission lever 39 and the corresponding conversion mechanism KI, the sub-transmission lever 40 and the corresponding conversion mechanism KI, and the brake lever 45 and the corresponding conversion mechanism KI are all located inside the cabin 8.

[0046] The operating rod RO is positioned to pass through through holes AL formed in the floor 8A of the cabin 8, moving vertically through the floor 8A. Specifically, as shown in Figures 5 to 8, there are three through holes AL, and one operating rod RO passes through each through hole AL. That is, the main transmission operating rod 48 is positioned to pass through the floor 8A vertically through the first through hole 60. The auxiliary transmission operating rod 51 is positioned to pass through the floor 8A vertically through the second through hole 61. The brake operating rod 52 is positioned to pass through the floor 8A vertically through the third through hole 62.

[0047] The underside of the floor 8A of the cabin 8 is provided with cover members 63 that cover the through-holes AL and the operating rod RO. Cover members 63 are provided separately for each of the three through-holes 60, 61, and 62. The cover members 63 are made of boots constructed by bending rubber material into a bellows shape. Even when the operating rod RO is slid along the longitudinal direction, the cover members 63 expand and contract, maintaining a sealed state at the point where the operating rod RO passes through. By adopting the above arrangement configuration, the airtightness of the internal space of the cabin 8 can be improved.

[0048] [Another embodiment] (1) In the above embodiment, multiple operating rods RO and through holes AL are provided, and one operating rod RO is passed through one through hole AL. However, it is also possible to have a configuration in which only one operating rod RO and one through hole AL are provided, or a configuration in which two or more operating rods are passed through one through hole AL.

[0049] (2) In the above embodiment, a rubber boot was used as the cover member 63, but instead, a cover member made of a soft resin material may be used, or a configuration without a cover member may be used to improve the sealing of the through hole AL.

[0050] (3) In the above embodiment, the operating lever RE is provided on the side panel 37, but the configuration is not limited to this, and the operating lever RE may be provided in front of or behind the driver's seat 7A.

[0051] (4) In the above embodiment, the operated device is provided with a transmission 19 (sub-transmission 20 and brake device) and a main transmission 18, but it may be provided with only one of these, and in addition to the transmission 19 and main transmission 18, it may also be provided with a brake device of a different configuration, or with any other device.

[0052] (5) In the above embodiment, the operated device HS is positioned below the operating unit 7, but it is not limited to being positioned below the operating unit 7; it may also be positioned below the threshing device 4 or the grain tank 5, and the arrangement can be changed as appropriate. [Industrial applicability]

[0053] This invention is not limited to combine harvesters, but can also be applied to other types of work vehicles such as tractors and rice transplanters. [Explanation of Symbols]

[0054] 8 cabins 8A floor 18. Main transmission (hydrostatic continuously variable transmission) 19 Transmission 21 Parking brake 37 Side Panel 63 Cover component AL through hole KI conversion mechanism HS Operated device RE operating lever RO operating rod

Claims

1. The driver's compartment and, The cabin covering the aforementioned driver's section, An operating lever located inside the cabin, An operating device provided outside the cabin, An operating rod connected to the device to be operated, The system includes a conversion mechanism connected to the operating lever and the operating rod, which converts the movement of the operating lever into the movement of the operating rod, A through hole is formed in the floor of the cabin. The operating rod is positioned so as to penetrate the floor of the cabin through the through-hole, A work vehicle in which the conversion mechanism is located inside the cabin.

2. The operating rod and the multiple through holes are provided, The work vehicle according to claim 1, wherein one operating rod is passed through one of the through holes.

3. The work vehicle according to claim 1, wherein a cover member is provided that is positioned on the underside of the cabin floor and covers the through hole and the operating rod.

4. The work vehicle according to claim 1, wherein the operating lever is located on the side panel of the operating unit.

5. The work vehicle according to claim 1, wherein the operated device is located below the operating unit.

6. The work vehicle according to claim 1, wherein the operated device is a transmission, a hydrostatic continuously variable transmission, or a parking brake.

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