JP2023132351A - Combine harvester - Google Patents

Abstract

To detect the reaping height in a reliable manner in a combine harvester having a structure for detecting the reaping height by a reaping unit, by preventing malfunction due to contact with stocks broken by the reaping unit or their roots.SOLUTION: A combine harvester comprises: a reaping unit that is porvided to be raised and lowered in relation to a travel machine; and a reaping height detection device 40 for detecting the height of the reaping unit. The reaping height detection device 40 comprises a device body 41 that is vertically turnably installed; a grounding body 42 supported to be turnable relative to the device body 41; and a detection sensor 43 for detecting the quantity of rotation of the grounding body 42, and detects the height of the reaping unit on the basis of a detection signal by the detection sensor 43. The device body 41 is supported in relation to a grass divider support part 120 for supporting a grass dividing plate 21 provided on the front part of the reaping unit, and a unit supporter 44 for protecting the device body 41 from the front and both lateral sides is further provided.SELECTED DRAWING: Figure 5

Description

The present invention relates to a combine harvester with a height-adjustable cutting section.

In general, a combine harvester includes a reaping section on the front side of a traveling machine body and a threshing section on the traveling machine body, and the harvesting section reaps grain culms and the threshing section performs threshing while traveling. Conventionally, some combine harvesters have a reaping section that can be raised and lowered relative to the traveling machine body, and are equipped with a cutting height detection device to control the cutting height, which is the height of the reaping section from the ground (for example, (See Patent Document 1.) In such a configuration, the operation of a lifting device such as a hydraulic cylinder that raises and lowers the reaping section is controlled based on the detection signal of the cutting height detection device, and the cutting height is automatically controlled.

Patent Document 1 discloses a configuration in which a cutting height detection device includes a sensor unit disposed at the lower rear of a weeding body included in a cutting section. The sensor unit consists of a unit body as a device body installed on a bracket attached to a grass cutting body, a potentiometer as a detection sensor that detects the rotational position of the unit body, and a sensor unit that is attached to the unit body as an axis in the left and right direction with respect to the unit body. and a grounding body rotatably provided in the direction.

The unit main body is attached to the bracket so as to be rotatable up and down by a rotation shaft located at the front of the unit and whose axis is in the left-right direction. The grounding body extends downward from the rear of the unit body.

Patent No. 5857987

According to the configuration of the sensor unit as disclosed in Patent Document 1, there are the following problems. During grain culm reaping work, the plant may be split left and right by the weeding body as the machine moves forward. In such a case, the plants that have been split left and right, their roots, etc. may come into contact with the unit body or grounding body located on the rear side of the splitting body. Contact of the plant or the like with the unit body or the grounding body may cause the sensor unit to malfunction and cause the detected value of the cutting height to become unstable. In particular, the fact that the left and right split plants act on the grounding body causes a decrease in the detection accuracy of the cutting height by the sensor unit.

The present invention has been made in view of the above-mentioned problems, and in the configuration for detecting the cutting height by the cutting section, it is possible to prevent the plants split left and right by the weeding body, their roots, etc. from coming into contact with each other. It is an object of the present invention to provide a combine harvester that can prevent malfunction due to the above and stably detect cutting height.

A combine according to the present invention includes a reaping section that is movable up and down with respect to a traveling machine body, and a cutting height detection device for detecting the height of the reaping section, the combine harvester comprising: The detection device includes a device main body that is provided to be movable up and down, a grounding body that is rotatably supported with respect to the device main body, and a detection sensor that detects the amount of rotation of the grounding body, The height of the reaping section is detected based on a detection signal from the detection sensor, and the apparatus main body is supported with respect to a weeding body support section that supports a weeding body provided at the front part of the reaping section. The device further includes a protection member that protects the device main body from the front side and both left and right sides.

In the combine harvester according to another aspect of the present invention, in the combine harvester, the protection member is provided so as to be rotatable with respect to the cutting body support part integrally with the device main body with the front-rear direction as an axial direction. It is something.

In the combine harvester according to another aspect of the present invention, in the combine harvester, the protection member is a plate-shaped portion with the thickness direction in the left and right direction as a portion that protects the device main body from both left and right sides. The device includes a plate portion, and the left and right side plate portions are provided with bent portions bent in directions facing each other so as to be located at the rear of the device main body.

In the combine harvester according to another aspect of the present invention, in the combine harvester, the cutting body support section includes a front guide section that is located in front of the device main body and guides the grain culms to the left and right outside as the machine body moves forward. It is provided.

According to the present invention, in the configuration for detecting the cutting height by the cutting section, it is possible to prevent malfunctions caused by contact between the plants split left and right by the weeding body, their roots, etc., and to stably detect the cutting height. The cutting height can be detected.

It is a left side view of a combine concerning one embodiment of the present invention. FIG. 1 is a right side view of a combine harvester according to an embodiment of the present invention. It is a top view showing the composition of the reaping part of the combine concerning one embodiment of the present invention. FIG. 2 is a left side view showing the configuration of a weeding part and a cutting height detection device according to an embodiment of the present invention. FIG. 1 is a left front perspective view showing a cutting height detection device and its support structure according to an embodiment of the present invention. FIG. 1 is a right front perspective view showing a cutting height detection device and its support configuration according to an embodiment of the present invention. FIG. 1 is a left side view showing a cutting height detection device and its support structure according to an embodiment of the present invention. FIG. 1 is a right side view showing a cutting height detection device and its support structure according to an embodiment of the present invention. FIG. 1 is a plan view of a cutting height detection device according to an embodiment of the present invention. FIG. 2 is a bottom view of a cutting height detection device according to an embodiment of the present invention. FIG. 1 is a front view showing a cutting height detection device and its support structure according to an embodiment of the present invention. FIG. 1 is a front perspective view showing a sensor unit according to an embodiment of the present invention. FIG. 2 is a plan sectional view showing the configuration of a shaft support of a cutting height detection device according to an embodiment of the present invention. FIG. 2 is a front view schematically showing a cutting height detection device and its peripheral configuration according to an embodiment of the present invention, and is an explanatory diagram of the effects of the combine harvester according to an embodiment of the present invention.

The present invention relates to a cutting height detection device for detecting the height of the cutting portion in a combine harvester having a height-adjustable cutting portion, and suppresses malfunction of the device by devising the configuration of the cutting height detection device. However, the aim is to improve the stability of the detection accuracy of cutting height. Embodiments of the present invention will be described below.

The overall configuration of a combine harvester 1 according to this embodiment will be described using FIGS. 1 and 2. In the following description, the left side and the right side when facing the front of the combine 1 (the left side in FIG. 1) are referred to as the left side and right side of the combine 1, respectively.

As shown in FIGS. 1 and 2, the combine 1 according to the present embodiment includes a running section 2 configured as a crawler-type traveling device having a pair of left and right crawler sections 3, 3, and a running section 2 supported by the running section 2. A traveling body 4 is provided. The traveling body 4 includes a frame-shaped structure of the vehicle body of the combine harvester 1 . The combine 1 includes an engine 11 as a drive source mounted on a traveling body 4.

A reaping section 5 is provided at the front of the traveling body 4 to take in grain culms of rice, wheat, etc. from the field while reaping them. A threshing section 6 that threshes the grain culm harvested by the reaping section 5 and a grain tank 7 that stores the grain taken out from the threshing section 6 are arranged side by side on the traveling body 4. There is. The threshing section 6 is placed on the left side of the machine, and the grain tank 7 is placed on the right side of the machine. The combine harvester 1 performs harvesting of grain culms by a reaping part 5, threshing by a threshing part 6, etc. while traveling by a traveling part 2.

Each crawler section 3 constituting the traveling section 2 includes a track frame 3a extending in the front-back direction below the traveling body 4, various rotating bodies such as a drive sprocket 3b supported by the track frame 3a, and rotation of these bodies. It has a crawler belt 3c wrapped around the body. The crawler section 3 is driven by receiving power from the engine 11 through the drive sprocket 3b.

The reaping section 5 is driven by the driving force from the engine 11, reaps the grain culm, and conveys the reaped grain culm to the threshing section 6 or the like. The reaping section 5 is provided on the front side of the traveling machine body 4 over substantially the entire body width of the combine harvester 1 . The reaping section 5 is provided so as to be movable up and down with respect to the traveling machine body 4. Note that FIG. 2 shows a state in which the reaping section 5 is lowered compared to the state shown in FIG.

The threshing section 6 includes a handling cylinder 6a whose rotational axis direction is the front-rear direction, and a grain culm feeding device provided on the left side of the handling cylinder 6a. The grain culm feeding device conveys the grain culm rearward in a recumbent position, holding the base of the grain culm harvested by the reaping unit 5 and with the ear tip facing the handling barrel 6a side. The grain culm supply device includes a feed chain 6b wound around a plurality of sprockets whose rotational axis is in the left-right direction, and a grain culm supply clamping body 6c that cooperates with the feed chain 6b to clamp the base of the grain culm. It is composed of:

A sorting section 8 is provided below the threshing section 6 on the traveling body 4 for sorting the processed material threshed by the threshing section 6. The sorting section 8 includes a swing sorting device 8a, a wind sorting device, and a grain conveying device. The sorting section 8 oscillates and sorts the processed material that has fallen from the threshing section 6 using a oscillating sorting device 8a, and wind-sorts the processed material after the oscillating sorting using a wind sorting device. The sorting unit 8 transports the grains from the processed material after wind sorting to the right toward the grain tank 7 by a grain conveying device, and blows straw, dust, etc. backwards by a wind sorting device, and transfers them to the right side. discharge to the outside. The grains transported toward the grain tank 7 by the grain transport device are stored in the grain tank 7.

A discharge auger 9 serving as a grain discharge device for discharging the grains in the grain tank 7 to the outside is rotatably provided at the right rear end portion of the traveling body 4. The discharge auger 9 has a discharge port 9a at its tip, and discharges the grains stored in the grain tank 7 from the discharge port 9a. The grains discharged from the discharge port 9a are put into a truck bed, a container, or the like.

On the traveling body 4, behind the threshing section 6, a waste straw processing section 10 is provided that processes waste straw after being threshed by the threshing section 6. The waste straw processing unit 10 includes a waste straw conveying device 10a and a waste straw cutting device 10b. The straw discharging device 10a transports the threshed grain culm (discarded culm) rearward by the threshing section 6 and discharges it to the outside of the machine, or conveys it to the straw discharging cutting device 10b. The straw cutting device 10b cuts the waste culm conveyed from the straw transportation device 10a and discharges it to the outside of the machine.

On the traveling body 4, on the right side of the reaping section 5 and in front of the grain tank 7, a driving section 14 covered by a cabin 13 is provided. A handle part 15 as a steering operation part is provided in the front part of the driver part 14, a driver's seat 16 is provided behind the handle part 15, and various operations are provided on the side of the driver's seat 16. Equipment is provided.

A prime mover section including the engine 11 is provided below the driving section 14 . Engine 11 is, for example, a diesel engine. The power of the engine 11 is transmitted to various devices provided in each part of the combine 1 via a transmission and the like.

The reaping section 5 will be explained using FIGS. 1 to 3. The reaping section 5 has a reaping support frame 20 as a reaping frame, and the reaping support frame 20 is equipped with a grass dividing plate 21, a pulling device 22, a raking device 23, a cutting blade device 24, and a grain culm conveying device 25. It is constructed by supporting etc. Each device included in the reaping section 5 is operated by power being transmitted from the engine 11.

The grass dividing board 21 is an example of a grass dividing body that constitutes the grass dividing section 50 that the cutting section 5 has, and is provided at the front part of the cutting section 5 . The grass dividing board 21 has a tapered shape and separates grain culms growing in the field. The pulling device 22 is provided on the rear side of the grass dividing board 21, and raises the lodging grain culm by operating a plurality of tines 22a connected by a chain.

The raking device 23 is provided on the rear side of the raising device 22, and includes a chain-driven conveyance mechanism 23a, a rotary packer 23b, and the like, and rakes the grain culm. In addition, in FIG. 3, only the component provided at the left end of the scraping device 23 is shown, and illustration of other components is omitted.

The cutting blade device 24 is a clipper-type device that cuts the base of the raised grain culm. The grain culm conveying device 25 is a device for conveying the harvested grain culms, and it joins a plurality of reaped grain culms, conveys them rearward and upward, and places them in a sideways position at the starting end of the feed chain 6b of the threshing section 6. Hand it over.

As shown in FIG. 1, the reaping support frame 20 is supported by a support frame 26 that is arranged in a downward-sloping manner on the front side of the traveling machine body 4. As shown in FIG. The support frame 26 is provided approximately at the center in the left-right direction of the machine body, and the reaping support machine frame 20 is provided on the front side of the support frame 26.

As shown in FIG. 3, the reaping support frame 20 includes a horizontal frame 31 extending in the left-right direction of the machine body, and a plurality of weeding frames 32 and 34 extending forward from the horizontal frame 31. The reaping support frame 20 is supported by a support frame 26 in the horizontal frame 31.

The horizontal frame 31 is a linear frame portion made of a square pipe-shaped member. The weeding frames 32 and 34 are frame portions made of round pipe-shaped members, have a predetermined bent or curved shape, and extend in the front-rear direction in plan view. The weeding frames 32 and 34 are supported in a cantilevered manner by fixedly supporting the rear end portions or rear portions to the horizontal frame 31.

The plurality of weeding frames 32 and 34 are arranged in parallel at a predetermined interval in the left-right direction. The number of weeding frames 32 and 34 is one more than the number of rows to be cut by the combine 1. The combine harvester 1 according to this embodiment is capable of cutting six rows, and seven weeding frames 32 and 34 are provided. Among the seven grass cutting frames 32 and 34, the grass cutting frames 34 located second and sixth from the left, respectively, have shapes different from the other plurality of (five) grass cutting frames 32.

A pulling device 22 is arranged between the grass dividing frames 32 and 34 adjacent to each other on the left and right, and a total of six pulling devices 22 are provided. A lower part of the pulling device 22 is connected and supported to the front part of each of the grass dividing frames 32 and 34 via a support stay (not shown) or the like. Further, a grass dividing board 21 is attached to the front part of each grass dividing frame 32, 34. Note that, as the plurality of grass dividing boards 21, two types of grass dividing boards 21, a relatively large one and a relatively small one, are provided in a predetermined arrangement. In this embodiment, four relatively large grass dividing boards 21 and three relatively small grass dividing boards 21 are arranged alternately in the left and right direction.

The reaping section 5 having the above configuration is rotatably attached to the traveling machine body 4 about a predetermined axis via a hydraulic cylinder 18 (see FIG. 1) as a lifting device. That is, the reaping section 5 is provided so as to be movable up and down with respect to the traveling machine body 4 by rotational movement caused by the expansion and contraction movement of the hydraulic cylinder 18. The hydraulic cylinder 18 is provided between the traveling body 4 and the support frame 26. A rear end portion of the support frame 26 is supported so as to be rotatable around an axis in the left-right direction with respect to the traveling body 4 as a rotational fulcrum for the vertical movement of the reaping section 5.

As mentioned above, the combine harvester 1 is provided with the reaping part 5 movable up and down with respect to the traveling machine body 4. The combine 1 includes a cutting height detection device 40 in order to control the cutting height (height above the ground), which is the height of the cutting section 5 from the ground G1. In such a configuration, the operation of the hydraulic cylinder 18 that raises and lowers the reaping section 5 is controlled based on the detection signal of the cutting height detection device 40, and the cutting height is automatically controlled.

The operation of the hydraulic cylinder 18 is controlled by the operation control of a solenoid valve that is a control valve. A control device (not shown) constituting a control unit included in the combine harvester 1 controls the cutting height by controlling the operation of the control valve of the hydraulic cylinder 18 based on the detection signal of the cutting height detection device 40.

The automatic control of the cutting height involves controlling the operation of the control valve of the hydraulic cylinder 18 to maintain the cutting height of the cutting section 5 at the set value based on the detection signal of the cutting height detection device 40. 5 is automatically controlled to raise and lower. In automatic control of the cutting height, the control device controls the cutting section 5 so that the cutting height detected by the cutting height detection device 40 reaches a preset target value (hereinafter referred to as "cutting height target value"). Control height.

That is, if the detected cutting height is below the target cutting height value, the control device raises the cutting section 5, and if the detected cutting height is above the target cutting height value, the control device raises the cutting section 5. By lowering the section 5, the elevation control of the reaping section 5 is performed so that the height of the reaping section 5 is maintained at a height corresponding to the target cutting height value. The operating unit 14 is provided with an operation unit for adjusting the cutting height, and for example, during automatic control of the cutting height, control is performed to prioritize adjustment of the cutting height by operating the operation unit. . The cutting height target value is, for example, 10 mm, 30 mm, 50 mm, etc.

As described above, the combine harvester 1 has a weed cutting section 50 including a weed cutting board 21 and a mowing section 5 that is movable up and down with respect to the traveling body 4, and a cutting height that is the height of the mowing section 5. and a cutting height detection device 40 for detecting the cutting height.

In this embodiment, the cutting height detection device 40 is arranged behind the grass dividing plates 21A, which are located second and sixth from the left among the seven grass dividing plates 21 (see FIG. 3). . The grass dividing board 21A is supported by a grass dividing frame 34 having a different shape from other grass dividing frames 32. The grass dividing board 21A is a relatively smaller grass dividing board 21 among the two types of grass dividing boards 21. In this way, the combine 1 includes two cutting height detection devices 40. However, the number of cutting height detection devices 40 included in the combine harvester 1 and the positions in which the cutting height detection devices 40 are provided are not limited. The cutting height detection device 40 may be provided, for example, at one location on the rear side of the grass dividing board 21 at the left end or right end.

The configuration of the cutting height detection device 40 and the support structure of the cutting height detection device 40 will be explained using FIGS. 4 to 14. The cutting height detection device 40 includes a device main body 41, a grounding body 42, a detection sensor 43 that is a cutting height sensor, and a unit support body 44 that is a member that supports the device main body 41.

In the cutting height detection device 40, the device body 41, the grounding body 42, and the detection sensor 43 constitute an integrated sensor unit 45 (see FIG. 12). It is rotatably supported around an axis in the left and right direction. The unit support body 44 is supported so as to be rotatable about an axis in the front-rear direction with respect to the weed part 50.

The cutting height detection device 40 as a whole is supported so as to be rotatable about an axis in the front and back direction with respect to the weeding part 50, and the sensor unit 45 is supported around an axis in the left and right direction with respect to the unit support body 44. It is rotatably supported. The rotation of the cutting height detection device 40 about the longitudinal axis and the rotation of the sensor unit 45 about the left and right axis are performed in response to an external force acting on the cutting height detection device 40. In the following, a state in which no external force is acting on the cutting height detection device 40 is defined as a reference state, and the cutting height detection device 40 in the standard state will basically be described.

In the sensor unit 45, the device main body 41 has a structure in which various gears, springs, etc. are supported on predetermined shafts within a case 51 made of, for example, metal casting. The case 51 has a left-right bipartite structure including a right case body 52 forming the main body of the case 51 and a left case body 53 covering the left side of the right case body 52 in a lid-like manner. The right case body 52 and the left case body 53 are fixed to each other by fixing bolts 55 at four locations around the case 51 when viewed from the side. The case 51 has a generally rectangular outer shape whose longitudinal direction is the front-rear direction (left-right direction in FIG. 7) when viewed from the side. The case 51 has an upwardly convex chevron-shaped upper side when viewed from the side.

In the sensor unit 45, the grounding body 42 extends downward from the rear side of the rear end of the case 51. Furthermore, the detection sensor 43 is attached to the right side of the case 51.

The unit support body 44 is a narrow plate-like member bent to form a predetermined shape in a plan view, and extends in the front-rear direction. As shown in FIGS. 9 and 10, the unit support 44 includes a first support 46 mainly forming the left side of the unit support 44 and a first support 46 mainly forming the right side of the unit support 44. 2 supports 47.

The unit support body 44 includes a left side part 44a that is elongated in the front-rear direction, a front part 44b formed to form a right angle from the front end of the left side part 44a to the right, and a front part 44b that extends rearward from the right end of the front part 44b. It has a right side surface portion 44c that is formed toward the right side and is elongated in the front-rear direction. All of these surface portions forming the unit support body 44 are vertical surface portions.

That is, the first support body 46 and the second support body 47 are both plate-shaped members bent to form a predetermined shape in a plan view, and these supports support the left side surface portion 44a and the front surface portion. 44b and a right side surface portion 44c are formed. The unit support 44 has a shape such that its lower edge is located at a substantially constant height as a whole.

As shown in FIGS. 9 and 10, the first support 46 includes an outer wall surface 46a forming the left side surface 44a of the unit support 44, and a front wall surface 46b forming a part of the front surface 44b of the unit support 44. and an inner wall surface portion 46c formed to form a right angle toward the rear from the right end portion of the front wall surface portion 46b. The inner wall surface portion 46c is formed to face the front end portion of the outer wall surface portion 46a in the left-right direction. The first support body 46 has an approximately "J"-shaped bent shape when viewed from above by an outer wall surface portion 46a, a front wall surface portion 46b, and an inner wall surface portion 46c (see FIG. 9).

The second support 47 includes a side wall 47a forming the right side 44c of the unit support 44, a front wall 47b forming a part of the front 44b of the unit support 44, and the side wall 47a and the front wall 47b. It has a sloped wall surface portion 47c formed at a corner portion and having a chamfered shape when viewed from the bottom.

The left side surface portion 44a of the unit support body 44 (the outer wall surface portion 46a of the first support body 46) is a plate-shaped portion elongated in the front and rear directions with the left-right direction as the plate thickness direction. The left side part 44a has approximately half of the front side as a wide part with a relatively wide dimension (width) in the vertical direction, and approximately half of the rear side is approximately 1/2 to 1/3 of the front part. It is a narrow part with a width of about 100 cm. The left side surface portion 44a has an oblique side portion above the front-rear center portion that slopes downward so that the width gradually narrows from the front side to the rear side. The left side surface portion 44a has a rear end extending further rearward than the rear end of the case 51 in the front-rear direction.

The front part 44b of the unit support body 44 is a plate-shaped part whose thickness direction is the front-rear direction. The front part 44b has a vertical dimension that is approximately the same as the vertical dimension of the front part of the left side part 44a. The front surface portion 44b has a dimension in the left-right direction that is approximately 1/2 the length of the left side surface portion 44a in the front-rear direction. The front portion 44b is formed by a front wall portion 46b of the first support 46 and a front wall portion 47b of the second support 47. Specifically, the front surface portion 44b is a portion where the second support body 47 overlaps the front side wall surface portion 47b from the front side with respect to the right side portion of the front side wall surface portion 46b of the first support body 46.

The first support body 46 and the second support body 47 are connected to each other by being fastened and fixed by a screw body 48 and a nut 49 that pass through the overlapping portion of the front wall surface portions 46b and 47b. The threaded body 48 has a threaded portion protruding forward from the front wall surface portion 47b of the second support body 47, and a nut 49 is screwed into this protruding portion. The fixing portions formed by the screw bodies 48 are provided at two locations, upper and lower.

The right side surface portion 44c of the unit support body 44 (the side wall surface portion 47a of the second support body 47) is a longitudinally elongated plate-shaped portion whose thickness direction is the left-right direction, and faces the left side surface portion 44a in the left-right direction. It is set up like this. The right side part 44c has a relatively wide front part, and a narrow part having a width about 1/2 to 1/3 of the front part. It is a part. The front portion of the right side portion 44c has a vertical dimension that is approximately the same as the vertical dimension of the front portion 44b. The right side surface portion 44c has an oblique side portion on the upper side of the front portion that slopes downward so that the width gradually narrows from the front side to the rear side. The right side surface portion 44c has a rear end located at approximately the same position as the rear end of the case 51 in the front-rear direction.

The unit support body 44 is open at the top and bottom, and has a substantially rectangular shape with the longitudinal direction in the front-rear direction in plan view due to the left side part 44a, the front part 44b, and the right side part 44c. The unit support body 44 has a left side part 44a, a front side part 44b, and a right side part 44c located on the left side, the front side, and the right side of the sensor unit 45 (see FIG. 12), respectively, and has a peripheral wall surrounding the sensor unit 45. It makes up the department. That is, the sensor unit 45 is provided so that substantially the entirety thereof is located in a space surrounded by the unit support 44 when viewed from above.

The sensor unit 45 is located substantially entirely inside the unit support body 44 in the front-rear direction and left-right direction. In particular, in the sensor unit 45, substantially the entire case 51 is located between the outer wall surface 46a and the inner wall surface 46c of the first support 46 in the left-right direction. Thereby, the sensor unit 45 positions the front end of the case 51 immediately behind the front surface 44b and between the front end of the outer wall 46a (left side 44a) and the inner wall 46c.

Further, the sensor unit 45 is provided on both the left and right sides of the case 51 so that the left side surface portion 44a and the right side surface portion 44c are located at an intermediate portion of the case 51 in the vertical direction. That is, in the sensor unit 45, both upper and lower sides of the case 51 protrude from the unit support 44 with respect to the left side part 44a and the right side part 44c (see FIG. 7).

Each part of the sensor unit 45 will be explained. The device main body 41 is provided on a front fixed shaft 61, which is a first shaft, so as to be movable up and down. The front fixed shaft 61 is a support shaft whose axial direction is the left-right direction, and supports the sensor unit 45 rotatably about the first axis P1 (see FIGS. 7 and 9).

The front fixed shaft 61 is located near the front end of the case 51 in the device main body 41. The front fixed shaft 61 extends leftward from the inner wall surface 46c with its right end fixed to the inner wall surface 46c of the first support body 46 via the support plate 56. The front fixed shaft 61 is a fixed shaft supported in a cantilever manner with respect to the inner wall surface portion 46c. The support plate 56 is fixed at two upper and lower locations with bolts 57, in a state that it overlaps the inside (left side) of the inner wall surface portion 46c.

The front fixed shaft 61 may be any shaft fixed to the unit support 44 . Therefore, the front fixed shaft 61 may be a shaft supported in a cantilevered manner by fixing its left end to the front end of the left side 44a of the unit support 44. Alternatively, it may be a shaft fixed to both sides of the inner wall surface portion 46c and constructed between these.

The front fixed shaft 61 is supported so as to be rotatable relative to the case 51. That is, the case 51 is rotatably supported with respect to the front fixed shaft 61.

In this way, the sensor unit 45 is provided so as to be movable up and down in a state of cantilever support with the left and right direction as the axial direction with respect to the front fixed shaft 61 which is a fixed shaft fixed to the unit support body 44. (see arrow A1 in Figure 7). That is, the unit support body 44 supports the device main body 41 of the sensor unit 45 by the front fixed shaft 61 so as to be movable up and down about the first axis P1.

Regarding the rotation of the sensor unit 45 about the first axis P1 with respect to the unit support 44, the sensor unit 45 is rotated downward (to the left) by a case return member, which is an elastic member such as a spring provided in the case 51. (clockwise direction when viewed from the top). The case return member is, for example, a torsion spring having a coiled main body portion with linear extensions at both ends. In this case, the case return member is in a state in which the main body part is passed through the front fixed shaft 61, one extending part is locked to the front fixed shaft 61 side, and the other extending part is locked to the case 51 side. , and applies a force to the front fixed shaft 61 side to push the case 51 downward. Thereby, the sensor unit 45 is urged in a direction to rotate downward about the front fixed shaft 61.

Further, a case return spring 58 is provided on the rightward protruding portion of the front fixed shaft 61 from the case 51 for biasing the sensor unit 45 in the downward rotational direction with respect to the front fixed shaft 61. . The case return spring 58 is a torsion spring having a coiled main body portion with linear extensions 58a at both ends.

The case return spring 58 has a main body portion passed through the front fixed shaft 61, and one extending portion 58a is inserted into a locking hole portion 52a formed on the right side of the front portion of the right case body 52 of the case 51 (see FIG. 8). At the same time, the other extension part 58a is fixed to the front part 44b of the unit support 44 in a predetermined manner, and the case 51 is lowered with respect to the front fixed shaft 61 side. Apply a downward force to the side. Thereby, the sensor unit 45 is urged in a direction to rotate downward about the front fixed shaft 61.

On the other hand, regarding the rotation of the sensor unit 45 with respect to the unit support 44, a case stopper bolt 59 provided in the case 51 restricts the downward rotation of the sensor unit 45 at the reference state position. The case stopper bolt 59 is screwed into the middle part of the upper edge of the left case body 53 from the left side, and its head protrudes from the left case body 53 toward the left. The case stopper bolt 59 is located near the rear side of the upper front fixing bolt 55 among the four fixing bolts 55.

With such a configuration, in the standard state, the sensor unit 45 can be moved downward relative to the unit support 44 by bringing the head of the case stopper bolt 59 into contact with the upper edge of the left side surface 44a of the unit support 44. It is impossible to rotate. Note that the locking portion of the sensor unit 45 with respect to the unit support body 44 may be a protruding portion formed to protrude as a part of the left case body 53.

In this way, the sensor unit 45 is biased in the downward rotation direction about the front fixed shaft 61, and downward rotation with respect to the unit support body 44 from the reference state is restricted. Therefore, when an external force from the ground G1 or the like that causes the sensor unit 45 to rotate upward around the front fixed shaft 61 acts on the sensor unit 45, the sensor unit 45 is moved by the case return member in the case 51 and the case return member. It rotates upward against the urging force of the spring 58. The sensor unit 45 in the upwardly rotated state is automatically rotated downwardly by the biasing force of the case return spring 58 and the like when the external force is released, and the case stopper bolt 59 is moved against the unit support 44. The locking action returns to the reference state position.

The grounding body 42 is rotatably supported by a rear rotation shaft 62 which is a second shaft located behind the front fixed shaft 61 with respect to the device main body 41 . The rear rotation shaft 62 is a support shaft whose axial direction is in the left-right direction, and rotatably supports the grounding body 42 with respect to the case 51 of the device main body 41 about the second axis P2.

The rear rotation shaft 62 is located near the rear end of the case 51 and is supported so as to be rotatable relative to the case 51 via a bearing member such as a bush. A grounding body 42 is fixed to a portion of the rear rotation shaft 62 that protrudes rightward from the case 51. The grounding body 42 has a grounding body main body portion 42a that is a portion extending downward from the device main body 41, and a support arm portion 42b that is a supporting portion for the rear rotation shaft 62. The ground body main body part 42a and the support arm part 42b are both plate-shaped parts having a predetermined shape.

The ground body main body portion 42a is a spatula-shaped portion having a downwardly expanding shape whose width (horizontal dimension) gradually increases from the upper side to the lower side. The ground body main body portion 42a has an obtuse bent shape with the front side convex when viewed from the side. The ground body main body portion 42a has a maximum width that is approximately the same as the left-right width of the case 51, and is located within the left-right width of the case 51 in the left-right direction.

The support arm portion 42b extends from the upper end of the ground body body portion 42a located immediately behind the case 51 to the right front side along the case 51, and is fixed to the rear rotation shaft 62. The support arm portion 42b has a front portion as a fixed surface portion with the plate thickness direction in the left-right direction, and the right end portion of the rear rotation shaft 62 is passed through this fixed surface portion, and the rear rotation shaft is fixed with a nut 68 or the like. It is fastened and fixed to 62. A threaded portion into which a nut 68 is screwed is formed at the right end of the rear rotation shaft 62 .

In this way, the grounding body 42 is fixed to the rear rotation shaft 62 and rotates integrally with the rear rotation shaft 62 about the second axis P2. The grounding body 42 is provided so as not to interfere with the case 51 within its rotation range. Regarding the rotational position of the grounding body 42, the position of the grounding body 42 in the cutting height detection device 40 in the reference state is defined as the reference position.

The grounding body 42 performs the following rotation as a relative rotation about the rear rotation axis 62 with respect to the device main body 41. That is, the grounding body 42 rotates so as to move the tip side backward due to drag resistance (ground sliding resistance) from the ground G1 due to the forward movement of the combine 1, with the tip in contact with the ground G1. (rotate backward) (see arrow C1 in FIG. 7). On the other hand, the grounding body 42 rotates (forward rotation) so as to move the distal end side forward due to the grounding sliding resistance caused by the combine harvester 1 moving backward (see arrow C2 in FIG. 7).

The detection sensor 43 is a sensor that detects the amount of rotation of the grounding body 42 around the rear rotation axis 62. The detection sensor 43 is provided for the intermediate rotation shaft 70, which is the third axis of the cutting height detection device 40, and detects the rotation of the grounding body 42 around the rear rotation axis 62 based on the amount of rotation of the intermediate rotation shaft 70. Detect the amount of rotation.

The intermediate rotation shaft 70 is a support shaft whose axial direction is in the left-right direction, and is rotatable relative to the case 51 of the device main body 41 via a bearing member such as a bush about the third axis P3. Supported. The intermediate rotating shaft 70 is located between the front fixed shaft 61 and the rear rotating shaft 62 in the front-rear direction.

The detection sensor 43 is a rotary potentiometer, and detects the rotational position of the grounding body 42 via the intermediate rotation shaft 70 and the rear rotation shaft 62. The detection sensor 43 is fixed to the right case body 52 at two locations, front and rear, with bolts 73 on the right side surface of the right case body 52 .

The detection sensor 43 is connected to the right end of the intermediate rotation shaft 70, and directly detects the rotational position of the intermediate rotation shaft 70 about the third axis P3 using the intermediate rotation shaft 70 as a detection axis. . The detection sensor 43 has a main body part 43a and a connector part 43b to which a signal line is connected in the main body part 43a. One end side of a wire harness 80 as a signal line is connected to the connector portion 43b (see FIG. 6). The detection sensor 43 is connected to a control device provided on the traveling aircraft 4 side by a wire harness 80.

The connector portion 43b is a cylindrical portion that protrudes rearward and diagonally upward from the main body portion 43a. The wire harness 80, which has one end connected to the connector portion 43b, extends rearward and diagonally upward from the detection sensor 43. Note that the detection sensor 43 may have a configuration in which a signal line directly extends from the main body as a connection configuration to the control device.

The intermediate rotation shaft 70 rotates in response to transmission of the rotational power of the rear rotation shaft 62 as the grounding body 42 rotates. The intermediate rotation shaft 70 receives the rotational power of the rear rotation shaft 62 through gears and the like provided for each of the rear rotation shaft 62 and the intermediate rotation shaft 70 . The rotation of the intermediate rotation shaft 70 is detected by the detection sensor 43. Note that the grounding body 42 uses a grounding body return member, which is an elastic member such as a spring provided in the case 51, and can be adjusted later by setting the biasing force (torque) of the grounding body returning member, the case returning member, etc. Regarding rotation around the side rotation shaft 62, it is provided so as to be positioned at a predetermined reference position in a state where no external force is applied.

In the cutting height detection device 40 having the above-described configuration, when the grounding body 42 is located rearward from the reference position, the grounding body 42 rotates relative to the device main body 41 in a state where rotation about the front fixed shaft 61 is stopped. , is provided to rotate around a rear rotation axis 62. That is, when the combine harvester 1 is moving forward, for example, when the grounding body 42 is rotated rearward from the reference position due to a pressing action from the front, the device main body 41 rotates around the front fixed shaft 61. Without this, only the grounding body 42 rotates relative to the device main body 41 around the rear rotation axis 62.

The detection sensor 43 detects the amount of backward rotation of the grounding body 42 from the reference position. That is, the relative rotation of the grounding body 42 backward with respect to the device main body 41 from the state where the grounding body 42 is at the reference position is detected by the detection sensor 43 as a rotation for detecting the cutting height.

On the other hand, regarding the relative rotation of the grounding body 42 with respect to the device main body 41, the rotation of the grounding body 42 forward from the reference position is accompanied by upward rotation of the case 51. That is, when the grounding body 42 rotates forward from the reference position, the entire device main body 41 rotates upward around the front fixed shaft 61 in conjunction with the rotation of the grounding body 42 . Here, when the grounding body 42 rotates forward relative to the device main body 41 from the reference position, the intermediate rotation shaft 70 does not rotate, and the rotation of the intermediate rotation shaft 70 is not detected by the detection sensor 43. Not done.

As described above, the cutting height detection device 40 is configured such that the detection sensor 43 detects the amount of rotation of the grounding body 42 when the grounding body 42 is rotated backward from the reference position with respect to the device main body 41. has been done.

With the cutting height detection device 40 having the above configuration, the combine harvester 1 detects the height (cutting height) of the reaping section 5 based on the detection signal from the detection sensor 43. As described above, the cutting height detection device 40 detects the rearward rotation of the grounding body 42, and therefore mainly detects the cutting height when the combine 1 is moving forward.

In the cutting height detection device 40, the detection sensor 43 detects the rotational position of the intermediate rotation shaft 70 that rotates in conjunction with the rotation of the grounding body 42, thereby determining the height of the grass dividing plate 21 from the ground G1. In other words, the cutting height is detected. The detection signal of the grounding body 42 is sent to the control device through the wire harness 80. The control device receives the detection signal input from the detection sensor 43, and operates the hydraulic cylinder 18 (see FIG. 1) based on the detection signal so as to maintain the cutting height calculated from the detection result at the set value. and adjust the cutting height.

The cutting height detection device 40 is rotated so as to swing from side to side about an axis O1 (see FIGS. 7 and 9) along the front-rear direction due to the support structure of the unit support body 44 for the weed part 50. Possibly supported.

The configuration of the weeding section 50 will be explained. The grass cutting section 50 includes a grass cutting frame 34 provided at the lower part of the cutting section 5 and a grass cutting board 21 provided on the front side of the grass cutting frame 34. Here, the grass dividing plate 21 and the grass dividing frame 34 that support the cutting height detection device 40 are the grass dividing plate 21A and the grass dividing frame 34 located second and sixth from the left, respectively (see FIG. 3).

The weeding frame 34 has the following parts from the rear end side to the front end side. That is, as shown in FIG. 4, the weeding frame 34 has a rear inclined part 101 which is a front downwardly inclined part, an intermediate horizontal part 102 which is a horizontal part, and an obtuse angle corner together with the intermediate horizontal part 102. It has a front side slope part 103 which is a front upward slope part forming a part. The rear inclined portion 101 has a bent shape with a relatively steeper slope at the front than at the rear. The intermediate horizontal portion 102 and the front inclined portion 103 form a curved corner portion 104 . The weeding frame 34 has a rear end portion of the rear inclined portion 101 as a base end portion, and a front end portion of the front inclined portion 103 as a tip end portion.

The weeding frame 34 positions the rear end of the rear inclined part 101 above the horizontal frame 31, and connects the rear inclined part 101 to the horizontal frame 31 via a support member 105 fixed to the horizontal frame 31. It is fixed (see Figure 4). The support member 105 is constituted by a plurality of plate-shaped members fixed to the horizontal frame 31 and the weeding frame 34 by welding or the like.

The grass dividing board 21 includes a grass dividing board main body 121 and a rib plate portion 122 provided on the rear side of the grass dividing board main body 121. The grass divider main body 121 is a plate-shaped member having a convex front side in a plane cross-sectional view, and has a sharp-pointed shape that gradually becomes narrower from the rear side to the front side in a front view and a plan view. The grass divider main body 121 has a curved shape that is downward in the front and convex on the lower rear side in side view.

The rib plate portion 122 is a plate-shaped portion whose thickness direction is the left-right direction, and is provided at the left and right center portions of the grass divider body 121 on the rear side of the front plate portion of the grass divider body 121. The rib plate portion 122 is provided as an integral part with the grass divider main body 121 by fixing a plate-shaped member to the grass divider main body 121 by welding or the like. The rib plate portion 122 is provided on the grass dividing plate main body 121 in a range from approximately the center in the vertical direction to the lower end (tip).

The rib plate portion 122 has a shape that follows the curved shape of the grass divider main body 121 in a side view, and extends rearward from the grass divider main body 121 so as to form an arrow shape together with the grass divider main body 121 in a plan cross-sectional view. It is set to protrude. The configuration in which the rib plate portion 122 is provided on the grass dividing plate main body 121 has a substantially symmetrical shape.

Further, the grass dividing section 50 includes a hitch 125 as a grass dividing plate support member provided on the rear side of the grass dividing plate 21. The hitch 125 and the hitch support plate 124 constitute a weed support section 120. The weeding body support part 120 receives the weeding board 21 and is fixed to the weeding frame 34 to support the weeding board 21 with respect to the weeding frame 34 .

The hitch 125 is a longitudinal plate-like member, and is provided in an upwardly inclined manner so that its longitudinal direction follows the upwardly upwardly inclined slope of the grass dividing board 21 . The hitch 125 has a rear end located near the lower side of the rear end of the grass divider main body 121 in the extending direction of the grass divider main body 121, and a front end located approximately at the front and rear of the rib plate portion 122. It has a length that allows it to be located in the center.

The hitch 125 has a rear hitch rear portion 125a arranged in an inclined manner as a relatively narrow plate-like portion, and a portion in front of the hitch rear portion 125a as a hitch front portion that is wider than the hitch rear portion 125a. 125b. The hitch front portion 125b is a portion of the hitch 125 located in front of the device main body 41. The hitch front part 125b forms a linear upper edge of the hitch 125 together with the hitch rear part 125a, and also forms a downward protrusion along a substantially rectangular shape when viewed from the side, and has a vertical dimension of the front part of the hitch 125. is partially enlarged. The hitch front portion 125b has a rear portion protruding downward from the grass divider plate 21 when viewed from the side. The hitch front portion 125b forms a horizontal lower edge portion 125c at the front portion of the hitch 125.

The hitch 125 is fixed to the weeding frame 34 via the hitch support plate 124. The hitch support plate 124 is a plate-shaped member whose thickness direction is in the left-right direction, and is fixed to the front inclined portion 103 of the grass division frame 34 by welding or the like. The hitch support plate 124 is provided so as to protrude forward and downward from the front side of the upper part of the front side slope part 103 so as to follow the slope of the grass divider plate 21 .

The hitch support plate 124 has a substantially triangular outer shape whose vertical dimension gradually decreases from the rear side to the front side when viewed from the side. The hitch support plate 124 is disposed approximately at the center of the cylindrical front inclined portion 103 in the left-right direction. Note that the hitch support plate 124 has a thicker thickness than the hitch 125.

The hitch 125 is fastened and fixed to the hitch support plate 124 with bolts 127 and nuts 128 at two locations, front and rear, with the hitch rear portion 125a stacked on top of the hitch support plate 124 from the left side. The bolt 127 passes through the hitch 125 and the hitch support plate 124 and is screwed into the nut 128. The hitch support plate 124 has a lower exposed portion 124a at the rear that projects downward from the rear of the hitch 125 when viewed from the left side. The lower exposed part 124a is a part of the hitch support plate 124 that is lower than the rear fixed part of the two fixed parts by the bolts 127 when viewed from the left side, and is located between the rear end and the front of the hitch 125. This is a portion located between the inclined portion 103 and the inclined portion 103.

A grass dividing plate 21 is attached to the hitch 125. The grass divider board 21 is fastened and fixed to the hitch 125 at two places, front and rear, with bolts 141 and nuts 142, with the rear part of the rib plate part 122 stacked on the hitch front part 125b from the right side. The bolt 141 passes through the hitch 125 and the rib plate portion 122 and is screwed into the nut 142.

In this way, the hitch 125 supports the grass dividing board 21 in front of the grass dividing frame 34 by being fixed to the grass dividing frame 34. The grass dividing board 21 is attached to the grass dividing body support part 120 so that its position can be adjusted. In this embodiment, the grass dividing board 21 is provided so that its attachment angle (inclination angle) with respect to the hitch 125 that constitutes the grass dividing body support section 120 can be adjusted. That is, the grass dividing board 21 is attached to the hitch 125 so that its angular position can be adjusted.

Specifically, as shown in FIG. 7, of the two front and rear fixing portions of the bolt 141 to the rib plate portion 122 of the hitch 125, a bolt hole 125d through which the bolt 141 passes through the hitch 125 is provided at the rear fixing portion. is a long hole whose longitudinal direction is the direction of the downward slope. Further, the bolt hole 125e of the hitch 125 in the front fixing portion is a circular hole through which the bolt 141 passes.

With such a fixing structure of the hitch 125, the grass divider plate 21 can be rotated with respect to the hitch 125 by the bolt hole 125d, which is a long hole, in the rotation direction with the center of the fixed part by the bolt 141 on the front side as the rotation fulcrum B0. The mounting angle (tilt angle) can be adjusted within the movable range (see arrow B1 in FIG. 4). That is, the grass dividing board 21 can be rotated up and down to raise and lower the rear side within a rotation range using the lower fixed part as a fulcrum for position adjustment. In addition, in FIG. 7 and FIG. 8, the grass dividing board 21 in a lowered state is shown with a two-dot chain line, and the grass dividing board 21 in a raised state is shown with a one-dot chain line.

The cutting height detection device 40 is supported so as to be rotatable around an axis in the front-rear direction with respect to the grass cutting section 50 having the above-described configuration. The cutting height detection device 40 has a shaft support 130 on its front side as a support portion for the weed splitter 50, and is rotatably supported by the shaft support 130 about an axis O1 in the front-rear direction. ing.

The pivot support 130 is provided on the rear side of the grass dividing plate 21. The shaft support 130 includes a boss portion 132 that is a support portion provided on the rear side of the grass divider plate 21, and a support shaft portion 131 that is provided at the front end of the unit support body 44 and supported by the boss portion 132. . The shaft support 130 has a structure in which a support shaft portion 131 protruding forward from the front wall portion 46b of the front surface portion 44b of the unit support body 44 is supported by a boss portion 132 provided at the lower end portion of the hitch 125. has. That is, the front end side of the cutting height detection device 40 is attached to the hitch 125 via the boss portion 132.

The support shaft portion 131 projects forward from the front wall surface portion 46b of the unit support body 44. The support shaft portion 131 is provided by penetrating and fixing a pin-shaped shaft to the front surface portion 44b by welding or the like with the front-rear direction as the axial direction. The support shaft portion 131 is an integral part of the unit support body 44, and has its axis aligned with the axis O1.

As shown in FIG. 13, the boss portion 132 is a hollow cylindrical portion that forms a shaft support space 132b with a cylindrical inner circumferential surface 132a, and has an open rear side and a tapered portion 132c on the front side. There is. The boss portion 132 is provided by fixing a cylindrical member to the lower end portion of the hitch 125.

The hitch 125 has a notch-like recess 125f at its lower end, which has a bent shape that follows the shape of the front portion of the boss portion 132 in a side view. The cylindrical member forming the boss portion 132 is fixed to the hitch 125 by welding or the like, with its front portion fitted into the recess 125f of the hitch 125. The boss portion 132 has an outer diameter larger than the thickness of the hitch 125, and positions the hitch 125 in the center in the left-right direction.

A support shaft portion 131 is rotatably supported by the boss portion 132 with its front portion inserted into a shaft support space 132b. The boss portion 132 has a rear opening-side surface end close to the front surface of the front portion 44b of the unit support body 44. A cylindrical bush 134 and an O-ring 136 are interposed between the support shaft portion 131 and the inner circumferential surface 132a of the boss portion 132, and serve as a bearing member that passes through the support shaft portion 131. The O-ring 136 is located near the open end of the boss portion 132 and is provided so as to fit into an outer circumferential groove 131c formed in the support shaft portion 131.

The support shaft portion 131 is prevented from coming off from the boss portion 132 by a set screw 137 and a lock nut 138 that are screwed from the outside of the boss portion 132 toward the inside in the radial direction. The lock nut 138 is fixed to the outer peripheral surface of the boss portion 132 by welding or the like. The set screw 137 is screwed into the lock nut 138, passes through the peripheral wall of the boss portion 132, and engages with the support shaft portion 131. The set screw 137 engages with the support shaft 131 by positioning its tip within the outer circumferential groove formed by the reduced diameter portion 131a in the front side of the bush 134 of the support shaft 131. (See Figure 13).

In this manner, the shaft support 130 supports the support shaft portion 131 provided at the front portion of the unit support body 44 with the boss portion 132 via the hitch 125 with respect to the grass dividing plate 21 . Thereby, the shaft support 130 rotatably supports the front side of the cutting height detection device 40 with respect to the weed part 50 with the front-rear direction as a rotation axis. The cutting height detection device 40 is supported in a cantilever manner with respect to the weed part 50 by a shaft support 130.

As described above, the cutting height detection device 40 is supported by the unit support 44 by supporting the unit support 44 rotatably around the axis O1 in the front-rear direction with respect to the weed part 50. The sensor unit 45 is supported so as to be swingable from side to side.

The cutting height detection device 40 is elastically positioned at a predetermined neutral position by a return spring 147 provided on the shaft support 130 with respect to rotation around the axis in the front-rear direction. The return spring 147 is a so-called torsion spring, and has linear extensions 147a at both ends of a coiled portion. The return spring 147 is provided with a coiled portion thereof passing through the rear part of the boss portion 132, and extending portions 147a at both ends thereof extending upward.

On the other hand, in the unit support body 44, a locking pin 148 is provided to protrude forward from the front side wall surface portion 46b. The locking pin 148 projects forward from a semicircular projection 44g provided on the upper edge of the front wall portion 46b, and is located above the boss portion 132.

The return spring 147 has extending portions 147a positioned on both left and right sides of the locking pin 148, and the locking pin 148 is held elastically by the extending portions 147a from both the left and right sides. In addition, the return spring 147 has extending portions 147a located on both left and right sides of the lower portion of the hitch 125 located above the locking pin 148, and the left and right extending portions 147a clamp the hitch 125 with elastic force. There is.

According to such a configuration, when an external force of a predetermined magnitude or more that causes the cutting height detection device 40 to rotate around the axis O1 acts on the cutting height detection device 40, the cutting height detection device 40 rotates in the rotation direction. In response to this, one extension 147a is pushed by the locking pin 148, and the other extension 147a is rotated against the elastic force of the return spring 147, with the other extension 147a being locked to the hitch 125. Then, when the external force ceases to act, the cutting height detection device 40 returns to the neutral position due to the elastic force of the return spring 147.

In the cutting height detection device 40 having the above configuration, the unit support body 44 functions as a protection member. A unit support 44 serving as a protection member supports the device main body 41 with respect to a grass dividing body support portion 120 that supports the grass dividing plate 21 provided at the front part of the cutting section 5, and supports the device main body 41 on the front side and on both left and right sides. protect from

The unit support body 44 is rotatably supported by the hitch 125 around a front-rear axis via a support shaft portion 131 and a boss portion 132 that protrude forward from the front portion 44b. Further, the unit support body 44 supports the device main body 41 so as to be rotatable around a left-right axis via a front fixed shaft 61 that protrudes leftward from the inner wall surface portion 46c.

In this way, the unit support 44 is interposed between the hitch 125 and the device main body 41 as a support member that supports the device main body 41 with respect to the hitch 125. That is, the device main body 41 is provided to the hitch 125 via the unit support 44.

Further, the unit support body 44 has a front part 44b located in front of the apparatus main body 41, and the front part 44b protects the apparatus main body 41 from the front side. The unit support body 44 covers the case 51 from the front side, with most of the front part 44b overlapping the case 51 of the apparatus main body 41 when viewed from the front.

The unit support body 44 has a left side part 44a and a right side part 44c located on the left and right sides of the apparatus main body 41, respectively, and the left side part 44a and the right side surface part 44c protect the apparatus main body 41 from both left and right sides. The unit support 44 covers the case 51 from the left side, with most of the left side portion 44a overlapping the case 51 when viewed from the left side. Further, the unit support body 44 covers the case 51 from the right side, with most of the right side portion 44c overlapping the case 51 when viewed from the right side.

In this way, the unit support body 44 protects the device main body 41 from both the left and right sides, and includes a left side surface portion 44a and a right side surface portion, which are left and right side plate portions that are plate-shaped portions with the thickness direction in the left and right direction. Contains 44c.

Further, the unit support body 44 is provided so as to be rotatable with respect to the weeding body support part 120 integrally with the device main body 41 with the front-rear direction as an axial direction. That is, due to the configuration in which the cutting height detection device 40 is supported by the shaft support 130 via the hitch 125 with respect to the grass dividing board 21, the unit support body 44 is integrated with the device main body 41 connected via the front fixed shaft 61. Specifically, it is supported to be rotatable about the axis O1 with respect to the hitch 125.

In addition, in the unit support body 44, left and right bent surface portions (151, 152) are provided on the rear side of each of the left side surface portion 44a and the right side surface portion 44c. ) is provided.

The left side surface portion 44a extends rearward from the rear end of the device main body 41 in the front-rear direction, and a left bent surface portion 151 is provided on the rear side of the left side surface portion 44a. The left bent surface portion 151 is bent from the rear end of the left side surface portion 44a, which is a plate-shaped portion with the left-right direction as the plate thickness direction, toward the left and right inner side (right side) so as to form an obtuse angle with the left side surface portion 44a when viewed from the bottom. It is a part. The left bent surface portion 151 is formed at the rear end portion of the first support body 46 . In this embodiment, the angle between the left side surface portion 44a and the left bent surface portion 151 is approximately 130°.

The left bent surface portion 151 has a slightly tapered shape whose vertical dimension gradually decreases from the left side surface portion 44a side to the distal end side. The left bent surface portion 151 is provided so that the tip portion 151a is positioned behind the left side portion of the case 51. The left bent surface portion 151 has a tip portion 151a formed into an arcuate rounded portion having a semi-cylindrical surface.

The right bent surface portion 152 on the rear side of the right side surface portion 44c extends from the rear end of the right side surface portion 44c, which is a plate-shaped portion with the left-right direction as the plate thickness direction, to the left and right inside ( This is the part that is bent toward the left side. The right bent surface portion 152 is formed at the rear end portion of the second support body 47. In this embodiment, the angle between the left side surface portion 44a and the right bent surface portion 152 is approximately 120°.

The right bent surface portion 152 has a slightly tapered shape whose vertical dimension gradually decreases from the right side surface portion 44c side to the distal end side. The right bent surface portion 152 is provided so that the tip portion 152a is positioned behind the right side portion of the case 51. The right bent surface portion 152 has a tip portion 152a formed into an arcuate rounded portion having a semi-cylindrical surface.

The left curved surface portion 151 and the right curved surface portion 152 are provided so that their tips 151a and 152a butt against each other. As shown in FIG. 10, the left and right bent surface portions 151, 152 have their respective tip portions 151a, 152a within the range D0 of the outer diameter of the grass dividing frame 34 located behind the cutting height detection device 40 in the left and right direction. It is set up to be located at. That is, in the left-right direction, the tip 151a of the left curved surface 151 is located on the right side (lower side in FIG. 10) of the left end position D1 of the weeding frame 34, and the tip 152a of the right curved surface 152 is , is located on the left side (upper side in FIG. 10) of the right end position D2 of the weeding frame 34.

In the configuration in which the unit support 44 has the left and right bent surface portions 151 and 152 as described above, the unit support 44 allows the vertical intermediate portion of the device body 41 to be viewed from both the left and right sides of the entire case 51 in the front and back direction. It will be completely covered. A gap 153 between the tip portions 151a and 152a of the left bent surface portion 151 and the right bent surface portion 152 on the rear side of the unit support body 44 is covered from the rear by the corner portion 104 of the weeding frame 34. . The gap 153 is covered by the weeding frame 34 in a plan view. Note that the bending angle of the left bent surface portion 151 and the right bent surface portion 152 with respect to the left side portion 44a or the right side portion 44c is not limited, and the bending angle may be an acute angle or a right angle. Good too.

In addition, among the hitches 125 constituting the weeding body support section 120, the hitch front section 125b is located in front of the device main body 41 and serves as a front guide section that guides the grain culms to the left and right outside as the machine moves forward. A horizontal guide plate section 160 is provided. The horizontal guide plate portion 160 is a horizontal plate-shaped portion, and is provided by fixing a front guide plate, which is a plate-shaped member, to the lower side of the hitch 125.

The horizontal guide plate portion 160 is provided by fixing a flat front guide plate to the horizontal lower surface of the lower edge portion 125c of the hitch 125 by welding or the like. The horizontal guide plate portion 160 has a substantially isosceles triangular outer shape with the apex side facing forward when viewed from the bottom. The horizontal guide plate section 160 has guide edges 162 on both left and right sides corresponding to oblique sides of the approximately isosceles triangular outer shape.

In the horizontal guide plate section 160, the hitch 125 is positioned approximately at the center in the left-right direction, and most of the left and right sides protrude from the hitch 125 to the left and right. Further, the horizontal guide plate portion 160 has a top portion 163, which is a front end portion, protruding forward from the lower edge portion 125c of the hitch 125 and is located on the left side of the rib plate portion 122. A right-angled notch 164 is formed on the top 163 side of the horizontal guide plate 160 to avoid interference with the rib plate 122 .

The horizontal guide plate section 160 has a rear edge located below the return spring 147. The horizontal guide plate section 160 has a rear surface 165 positioned slightly forward of the front surface section 44b of the unit support body 44 in the front-rear direction. A substantially U-shaped notch 166 is formed at the rear edge of the horizontal guide plate portion 160 to avoid interference with the cutting height detection device 40 that rotates around an axis in the front-rear direction.

Further, in the cutting height detection device 40, the detection sensor 43 is installed on the outside of the case 51 of the device main body 41. In this configuration in which the detection sensor 43 is disposed outside the device main body 41, the device main body 41 is provided with a sensor cover 170 that covers the detection sensor 43.

The sensor cover 170 is provided to cover the detection sensor 43 attached to the right side of the case 51 mainly from the upper side, the right side, and the rear upper side. The sensor cover 170 is an integral member having a substantially box shape with a plurality of surfaces, and is attached to the case 51 to form a cover portion with the front side and rear lower side open. The sensor cover 170 is a member made of resin or metal, for example.

The sensor cover 170 has a top surface portion 171 , a right side surface portion 172 , a rear top surface portion 173 , and a left side surface portion 174 facing the right side surface portion 172 . A fixing surface portion 175 for fixing the sensor cover 170 to the case 51 is provided on the left side of the sensor cover 170. The sensor cover 170 covers the entire detection sensor 43 from above and from the right side with a top surface portion 171 and a right side surface portion 172. The upper surface portion 171 and the right side surface portion 172 form a front opening 170 a on the right front side of the right case body 52 together with the right case body 52 .

The fixed surface portion 175 has a shape that follows the outer shape of the rear side of the upper side of the case 51, which is chevron-shaped when viewed from the side. The fixed surface portion 175 includes a horizontal front portion extending to the left from the front portion of the upper surface portion 171, and a rear portion of the front portion that is sloped downward along the lower edge of the left side portion 174. It has a rear inclined surface portion that forms a.

The sensor cover 170 is fixed to the case 51 with bolts 176 at two locations on the fixed surface portion 175: the front portion and the front and rear intermediate portions of the rear inclined surface portion. The bolt 176 passes through the fixing surface portion 175 and is screwed into a screw hole 52b (see FIG. 12) formed in the right case body 52 of the case 51.

In the sensor cover 170, the positions of the front edges of the upper surface part 171 and the right side part 172 are substantially aligned with the position of the front end of the detection sensor 43. A curved surface portion 177 is provided on the front edge of the right side surface portion 172 and has a quarter-cylindrical curved surface shape extending inward from the left and right over the entire vertical direction.

The sensor cover 170 has a rear portion formed as a projecting portion 178 that projects rearward from the top of the case 51. The projecting portion 178 is formed by the rear portions of the top surface portion 171 and the right side surface portion 172, the rear top surface portion 173, and the left side surface portion 174. It forms an enclosed internal space. This internal space forms an opening 179 that opens toward the rear lower side of the sensor cover 170 by the right side surface portion 172, the rear upper surface portion 173, and the left side surface portion 174. The internal space of the projecting portion 178 serves as a space for arranging the connection portion of the wire harness 80 to the detection sensor 43 and its vicinity within the sensor cover 170 .

The weeding body support part 120 has a part located above the device main body 41, and serves as an upper guide part that guides the grain culms to the left and right sides as the machine moves forward. A guide plate portion 202, a right front guide plate portion 203, and a right rear guide plate portion 204 are provided.

The left front guide plate portion 201 is a plate-shaped portion having a predetermined bent shape when viewed from the side, and is provided by fixing a plate-shaped member to the left side surface 125g of the hitch 125 by welding or the like. The left front guide plate portion 201 is provided in an inclined shape so as to follow the forward downward slope of the hitch 125. The left front guide plate portion 201 has a thickness direction that is perpendicular to the front downward inclination direction when viewed from the side.

The left front guide plate part 201 has a bent shape in side view, and includes, from the front side to the rear side, a front slope part 201a, an intermediate slope part 201b having a gentler slope than the front slope part 201a, and a rear slope part 201c. (See Figure 7). The left front guide plate portion 201 is provided so that approximately half of the front side, which is the front portion of the front slope portion 201a and the intermediate slope portion 201b, is covered by the left side portion of the grass divider plate 21 when viewed from the left side. Note that by rotating the grass dividing plate 21 upward, the entire or substantially entire left front guide plate portion 201 is exposed (see FIG. 7).

The left front guide plate section 201 has approximately half of the rear side consisting of the rear part of the intermediate slope part 201b and the rear slope part 201c located below the lower edge of the grass divider plate 21 in side view, and exposed from the grass divider plate 21. ing. The left front guide plate part 201 widens the left-right width of the rear inclined part 201c to the left side with respect to other parts, and the left side part of the rear inclined part 201c is directed leftward from the grass divider plate 21 when viewed from the front. It is projected outward.

In the left front guide plate part 201, the left end of the rear inclined part 201c is located outside (on the left side) of the case 51 in the left-right direction. In this embodiment, the side end surface 201d located at the left end of the rear inclined portion 201c is located at approximately the same position in the left-right direction as the left side surface 44d of the left side surface portion 44a of the unit support body 44 (see FIG. 11). Note that the side end surface 201d is a surface along the front-rear direction in plan view. The side surface of the front part of the rear inclined part 201c is an inclined surface 201e that is inclined in a direction that gradually narrows the width of the rear inclined part 201c from the rear side to the front side. The inclined surface 201e is continuous with the side surface 201f of the intermediate inclined portion 201b (see FIG. 14).

The rear inclined portion 201c of the left front guide plate portion 201 extends in an inclined shape along the lower edge of the rear portion of the hitch 125 when viewed from the left side. The left front guide plate part 201 has the front end of the rear inclined part 201c positioned above near the front end of the case 51 in the front-rear direction, and the rear end of the rear inclined part 201c positioned above the rear of the case 51. I'm letting you do it. In this way, the left front guide plate portion 201 has the rear inclined portion 201c as a portion located above the device main body 41, and the rear inclined portion 201c covers the left side portion of the device main body 41 from above.

The front inclined portion 201a and the intermediate inclined portion 201b of the left front guide plate portion 201 are provided so as to cover most of the upper portion of the left side portion of the case 51 when viewed from the front. The front inclined portion 201a has a rear side surface that is flush with the side surface 201f of the intermediate inclined portion 201b, and a front side surface that is oriented such that the width of the front inclined portion 201a is gradually narrowed from the rear side to the front side. The inclined surface 201g is inclined to . The left front guide plate portion 201 extends so that its front end portion is positioned forward of the boss portion 132 in the front-rear direction.

A left rear guide plate section 202 is provided on the rear side of the left front guide plate section 201 . The left rear guide plate part 202 is a plate-shaped part provided in parallel with the left front guide plate part 201 on the rear side of the left front guide plate part 201 . The left rear guide plate portion 202 is provided by fixing a plate-shaped member to the left side surface 124b of the hitch support plate 124 and the left outer peripheral surface of the front inclined portion 103 of the grass dividing frame 34 by welding or the like. . The plate-shaped member forming the left rear guide plate portion 202 has an arc-shaped recess 202a into which the grass dividing frame 34 is fitted (see FIG. 5).

The left rear guide plate part 202 has approximately the same width as the left front guide plate part 201, and in the left-right direction, the side end surface 202d located at the left end as a surface along the front-rear direction in plan view is the side of the left front guide plate part 201. It is located at approximately the same position as the end surface 201d (see FIG. 11). The left rear guide plate part 202 has a front side surface as an inclined surface 202e that is inclined in a direction that gradually narrows the width of the left rear guide plate part 202 from the rear side to the front side (see FIG. 5).

The left rear guide plate part 202 has a front end located below the rear end of the left front guide plate part 201, and is provided so as to be continuous with the left front guide plate part 201 in a plan view. The left rear guide plate section 202 has a front end located above the center of the case 51 in the front-rear direction, and a rear end located further back than the case 51. In this way, the left rear guide plate portion 202 is located above the device main body 41 and covers the rear portion of the left side portion of the device main body 41 from above.

The right front guide plate portion 203 is provided at a portion between the hitch support plate 124 and the rib plate portion 122 on the right side of the hitch 125. The right front guide plate portion 203 is provided by fixing a plate-shaped member to the right side surface 125h of the hitch 125 by welding or the like. The right front guide plate portion 203 is provided in an inclined shape along the forward downward slope of the hitch 125. The right front guide plate portion 203 has a thickness direction that is perpendicular to the front downward inclination direction when viewed from the side.

The right front guide plate portion 203 is provided so as to be entirely covered by the right side portion of the grass divider plate 21 when viewed from the right side. Note that by rotating the grass dividing plate 21 upward, the entire right front guide plate portion 203 is exposed (see FIG. 8). The right front guide plate portion 203 has a side end surface 203d located at the right end as a surface along the front-rear direction in plan view, located inside (on the left side) of the right end of the grass dividing board 21. The front right guide plate section 203 has a front side surface as an inclined surface 203e that is inclined in a direction that gradually narrows the width of the right front guide plate section 203 from the rear side to the front side.

The front right guide plate portion 203 has a front end portion located above the boss portion 132 and a rear end portion located above the front portion of the case 51 in the front-rear direction. In this manner, the right front guide plate portion 203 is located above the device main body 41 and covers the front portion of the right side portion of the device main body 41 from above.

A right rear guide plate section 204 is provided at the upper rear of the right front guide plate section 203 . The right rear guide plate part 204 is provided on the right side of the hitch support plate 124 at a height above the left rear guide plate part 202 in an inclined shape so as to follow the forward downward slope of the hitch 125. The right rear guide plate part 204 is a plate-shaped part provided so as to be parallel to the left rear guide plate part 202 and to have a substantially symmetrical outer shape in plan view. The right rear guide plate portion 204 is provided by fixing a plate-shaped member to the right side surface 124c of the hitch support plate 124 and the right outer peripheral surface of the front inclined portion 103 of the grass dividing frame 34 by welding or the like. . The plate-shaped member forming the right rear guide plate portion 204 has an arc-shaped recess 204a into which the grass dividing frame 34 is fitted (see FIG. 11).

In the right rear guide plate portion 204, a side end surface 204d located at the right end as a surface along the front-rear direction in plan view is located outside (on the right side) of the case 51 in the left-right direction. The front portion of the right rear guide plate portion 204 has a tapered shape whose width is gradually narrowed from the rear side to the front side. The right rear guide plate portion 204 has, as a right side surface, a side end surface 204d, a first inclined surface 204e on the front side of the side end surface 204d, and a second inclined surface 204f on the front side of the first inclined surface 204e. The angle of inclination of the second inclined surface 204f with respect to the front-rear direction in plan view is smaller than the same angle of inclination of the first inclined surface 204e.

The right rear guide plate portion 204 extends obliquely along the upper edge of the hitch support plate 124 when viewed from the right side. The right rear guide plate portion 204 has a front end portion located above the front portion of the case 51 and a rear end portion located further back than the case 51 in the front-rear direction. In this way, the right rear guide plate portion 204 is located above the device main body 41 and covers most of the rear side of the right side portion of the device main body 41 from above.

Of the four upper guide parts as described above, the front right guide plate part 203 and the rear right guide plate part 204 located on the right side are used as parts that support the wire harness 80 extending from the detection sensor 43. As shown in FIG. 6, the right front guide plate part 203 and the right rear guide plate part 204 are connected to the wire harness 80, which is arranged along the front downward slope of the grass cutting body support part 120 on the right side of the grass cutting body support part 120. It becomes a support plate part that supports a portion from below.

The right front guide plate portion 203 has an upper plate surface that is a flat inclined surface, and this upper plate surface serves as a support surface 203g for the wire harness 80. Similarly, the right rear guide plate portion 204 has an upper plate surface, which is a flat inclined surface, as a support surface 204g for the wire harness 80. The support surface 203g of the right front guide plate section 203 is an inclined surface that is stepped down from the support surface 204g of the right rear guide plate section 204.

The front right guide plate section 203 and the rear right guide plate section 204 support the wire harness 80 with a portion of the wire harness 80 placed on the support surfaces 203g and 204g, respectively. Due to the supporting action of the right front guide plate section 203 and the right rear guide plate section 204 on the wire harness 80, the wire harness 80 is partially guided so as to form a predetermined wiring configuration.

The portion of the wire harness 80 that is supported by the right front guide plate portion 203 and the right rear guide plate portion 204 is a portion that is arranged in an inclined manner along the front downward slope of the weeding body support portion 120. Further, most of the portion of the wire harness 80 supported by the right front guide plate portion 203 and the right rear guide plate portion 204 is covered by the right side portion of the grass dividing plate 21 in the lowered state.

In the right front guide plate part 203 and the right rear guide plate part 204, the wire harness 80 is attached to the right front guide plate part 203 and the right rear guide plate part 204 by a stopper such as a band or a locking device such as a clamp (not shown). It is locked and fixed as appropriate. This prevents the wire harness 80 from being misaligned with respect to the right front guide plate section 203 and the right rear guide plate section 204.

The wire harness 80 connects a connector (not shown) provided at one end to the connector portion 43b of the detection sensor 43, extends from the detection sensor 43, and connects the traveling aircraft 4 equipped with the control device through a predetermined wiring route. wired to the side. Specifically, the wire harness 80 is folded back from the connector part 43b with the connection port opening toward the rear upper side to the front side in the internal space of the overhang part 178 in the sensor cover 170, and is folded back to the front side in the internal space of the overhang part 178 in the sensor cover 170. 43 is placed with the top facing the front.

The wire harness 80 extends forward from the opening 170a on the front side of the sensor cover 170, is folded back near the boss portion 132 when viewed from the right side, and is placed in front of the weeding body support portion 120 on the right side of the weeding body support portion 120. It is placed toward the rear along a downward (backward upward) slope. A locking guide 180 is provided above the boss portion 132 to lock the wire harness 80 that is folded back.

The locking guide 180 is a substantially plate-shaped external portion having a predetermined bent or curved shape, is fixed to the right side surface 122a of the rib plate portion 122, and extends toward the right from the rear end of the rib plate portion 122. It stands out. The locking guide 180 has an arm portion 181 extending in the left-right direction, a bent portion 182 bent toward the front from the distal end of the arm portion 181, and a proximal end portion of the arm portion 181 in the protruding portion from the rib plate portion 122. It has a fixing part 183 bent toward the rear side. The locking guide 180 is provided on the rib plate portion 122 by fixing a fixing portion 183 to the right side surface 122a of the rib plate portion 122 by welding or the like. In addition, in the locking guide 180, an elongated opening is formed in the middle part in the width direction from the arm part 181 to the bent part 182.

The wire harness 80 folded back to the rear side by the locking guide 180 is supported and guided by the right front guide plate part 203 and the right rear guide plate part 204 on the right side of the weed support part 120. A portion of the wire harness 80 on the rear side of the portion supported by the right rear guide plate portion 204 is housed within the grass dividing frame 34.

The grass dividing frame 34 is made of a hollow pipe, and the internal space of the grass dividing frame 34 is a space in which the wire harness 80 is disposed. An elongated hole 34 a through which the wire harness 80 passes is formed in the right side peripheral wall of the front inclined portion 103 of the grass dividing frame 34 . A wire harness 80 arranged inside the weeding frame 34 extends outside the weeding frame 34 from a predetermined location at the rear of the weeding frame 34, and is connected to the control device on the machine side through a predetermined wiring route. There is. Note that the opening at the tip of the hollow pipe constituting the grass dividing frame 34 is closed by a disc-shaped lid member 35.

FIG. 6 shows a binding band 210 made of resin that serves as a fastener for fastening the wire harness 80 to a portion of the wire harness 80 disposed inside the sensor cover 170. In the example shown in FIG. 6, the binding band 210 has one side disposed outside the right side part 172 of the sensor cover 170, and the other side placed between the detection sensor 43 and the right case body within the sensor cover 170. 52 and into a locking hole 171a (see FIGS. 5 and 12) opened in the upper surface part 171 of the sensor cover 170, and is locked above the upper surface part 171.

The binding band 210 surrounds the wire harness 80 together with the detection sensor 43 and the right side portion 172 of the sensor cover 170, and fixes and holds the wire harness 80 disposed above the detection sensor 43 within the sensor cover 170. The wire harness 80 is not limited to the example shown in FIG. 6, but is fixedly held at an appropriate location by a binding band or the like in the wiring route.

The operation of the cutting height detection device 40 will be explained. During normal work with the combine 1, that is, when working with the machine moving forward, the cutting height is controlled based on the detected value of the cutting height by the cutting height detection device 40 so that the cutting height is maintained at the set value. will be held. The detection of the cutting height is performed with the rotational position of the grounding body 42 relative to the device main body 41 being behind the reference position.

When the aircraft moves forward, the grounding body 42, which slides with its tip in contact with the ground G1, rotates around the rear rotation axis 62 from the reference position with respect to the case 51 of the device main body 41 due to the ground sliding resistance. Rotate backward (see arrow C1 in Figure 7). The grounding body 42 rotates around the second axis P2 integrally with the rear rotation shaft 62, and the rotation of the rear rotation shaft 62 is transmitted to the intermediate rotation shaft 70 via a gear or the like. The rotation of the intermediate rotation shaft 70 is detected by the detection sensor 43, and the cutting height is detected based on the amount of rotation of the intermediate rotation shaft 70.

Further, when a lateral external force acts on the cutting height detection device 40, for example, when a steering operation of the machine body is performed with the grounding body 42 in contact with the ground, the cutting height detection device 40 uses the shaft support 130 to It rotates around the longitudinal axis O1 and escapes (see arrow E1 in FIG. 11). When the external force in the lateral direction ceases to act on the cutting height detection device 40, the biasing structure of the return spring 147 and the locking pin 148 causes the cutting height detection device 40 to return to a predetermined neutral position.

According to the combine harvester 1 having the above-described configuration, in the configuration for detecting the cutting height by the reaping section 5, errors caused by contact between plants split left and right by the weed dividing plate 21, their roots, etc. The operation can be prevented and the cutting height can be detected stably.

As shown in FIG. 14, in the grain culm reaping work, when horizontal cutting or the like is performed, the plant 220 may be split into left and right grain culms 221 by the grass dividing plate 21 as the machine moves forward. In such a case, the plant 220 split left and right, its root, etc. may come into contact with the device main body 41 and the grounding body 42 located on the rear side of the grass dividing board 21. Contact of the plant 220 or the like with the device main body 41 or the grounding body 42 may cause the sensor unit 45 to malfunction and cause the detected value of the cutting height to become unstable. In particular, the fact that the plant 220 or the like that is split left and right acts on the grounding body 42 causes a decrease in the detection accuracy of the cutting height by the sensor unit 45. Note that FIG. 14 is a front view schematically showing the configuration of the cutting height detection device 40 and its surroundings.

Therefore, the cutting height detection device 40 includes a unit support 44 as a protection member that supports the device main body 41 with respect to the grass cutting body support portion 120 and protects the device main body 41 from both left and right sides. Thereby, even if the plant is split left and right by the weed dividing board 21 during grain culm reaping work, the sensor unit 45 can be protected by the unit support 44.

That is, as the aircraft moves forward, plants, etc. that are split left and right by the grass dividing plate 21 are guided to the left and right outer sides of the sensor unit 45 by the unit support 44 on the rear side of the grass dividing plate 21, and are then tilted to the left and right outer sides. be able to. In other words, the unit support 44 can continuously apply a weed-dividing action to the plants, etc., which have been split left and right by the weed-dividing board 21.

Thereby, it is possible to suppress the plant that has been split left and right from coming into contact with the sensor unit 45. Specifically, for example, it is possible to prevent a plant that has been split laterally from falling down laterally inward and coming into contact with the device main body 41 or getting caught on the grounding body 42. Therefore, it is possible to suppress the malfunction of the sensor unit 45 due to, for example, a plant split laterally being caught on the grounding body 42, and the detection accuracy of the cutting height can be ensured. As a result, the operability of the combine 1 can be improved.

Further, the unit support body 44 is provided so as to be rotatable integrally with the device main body 41 around an axis in the front-rear direction with respect to a hitch 125 that constitutes the weeding body support section 120. According to such a configuration, when a lateral external force acts on the cutting height detection device 40, the cutting height detection device 40 can be rolled around the axis O1 to release the force, thereby reducing the influence of the external force. In addition, it is possible to make the unit support body 44 follow the rotating device main body 41. As a result, the device main body 41 can be protected by the unit support body 44 regardless of the rotational position of the device main body 41 around the axis in the front-rear direction, and the detection accuracy of the cutting height can be effectively stabilized. .

Further, the unit support body 44 has a left curved surface section 151 and a right curved surface section 152 bent in directions opposite to each other on the rear side of each of the left side surface section 44a and the right side surface section 44c. According to such a configuration, the rear side of the unit support body 44 surrounding the device main body 41 in plan view can be closed or substantially closed. This can prevent stumps, uncut plants, etc. from entering the inside of the unit support body 44 when the aircraft is moving backward, etc., and prevent the plants, etc. from coming into contact with the device main body 41, the grounding body 42, etc. Since this can be avoided, the detection accuracy of the cutting height can be effectively stabilized.

In particular, in the present embodiment, the left and right bent surface portions 151 and 152 are provided such that their respective tip portions 151a and 152a are located within the width range of the left and right sides of the weeding frame 34 located immediately behind them. There is. According to such a configuration, the gap 153 between the left and right curved surfaces 151 and 152 can be covered from the rear by the weed splitting frame 34, so that when the aircraft moves backward, etc. can effectively prevent the invasion of

Further, a horizontal guide plate portion 160 located at the front of the device main body 41 is provided below the hitch 125. According to such a configuration, the left and right guide edges 162 in the approximately isosceles triangular outer shape with the front side as the apex side in plan view mainly serve as guide parts, and the left and right guide edges 162 serve as guide parts to remove foreign objects such as split plants and weeds. As the aircraft moves forward, it can be guided to the left and right outside of the sensor unit 45. This can improve the weeding effect in conjunction with the weeding board 21, and can effectively prevent plants split left and right from coming into contact with the sensor unit 45.

Further, according to the combine harvester 1, in the configuration for detecting the cutting height by the cutting section 5, even if the position of the grass dividing plate 21 is adjusted, there is no need to reset the target value of the cutting height, which is good. It is possible to obtain excellent workability.

As described above, the cutting height target value that is preset in the automatic cutting height control is a value related to the height of the device main body 41 from the ground. For this reason, in a configuration in which the vertical position of the grass dividing board 21 can be adjusted, for example, in a configuration in which the device main body 41 is attached to the grass dividing board 21, the device main body 41 is attached to the grass dividing board 21 as the vertical position of the grass dividing board 21 is changed. 41 will move up and down, and it will be necessary to reset the target cutting height value, which will reduce work efficiency.

Therefore, as in the present embodiment, by providing the device main body 41 to the grass dividing body support part 120 that supports the grass dividing board 21 so that its position can be adjusted up and down, it can be used independently of the position adjustment of the grass dividing board 21. , the height position of the device main body 41 can be maintained. That is, since the grass dividing board 21 and the device main body 41 are provided relative to the grass dividing body support part 120 so as to be able to move independently, the height of only the grass dividing board 21 can be changed.

This eliminates the need to reset the target cutting height due to the position adjustment of the weeding board 21, so that the weeding board 21 may be adjusted depending on the growing situation of crops such as lodging, field conditions, etc. The position adjustment work can be performed smoothly, and work efficiency can be improved. Further, by ensuring support strength for the cutting height detection device 40 in the hitch 125, the strength of the hitch 125 can be improved.

Further, the weeding body support section 120 is provided with a left front guide plate section 201, a left rear guide plate section 202, a right front guide plate section 203, and a right rear guide plate section 204 as upper guide sections located above the device main body 41. It is being According to such a configuration, even when the weed dividing plate 21 is rotated upward, for example, these guide plate parts move the plants, etc. split to the left and right, to the left and right of the sensor unit 45 as the aircraft moves forward. It can be guided to the outside.

Thereby, irrespective of the position of the grass dividing board 21, it is possible to suppress the plants split to the left and right from coming into contact with the sensor unit 45, and the detection accuracy of the cutting height can be stabilized. In each guide plate section, the inclined surfaces 201e, 201g, 202e, 203e, the first inclined surface 204e, and the second inclined surface 204f mainly act as guide surfaces for the left and right split plants.

Furthermore, the front right guide plate section 203 and the rear right guide plate section 204 are used as supporting members for the wire harness 80. According to such a configuration, it is possible to eliminate the need to separately provide a member for supporting and guiding the wire harness 80 around the grass cutting body support part 120, so that the support structure for the wire harness 80 can be obtained at a low cost. I can do it.

Further, in a configuration in which the position of the grass dividing board 21 can be adjusted, a horizontal guide plate section 160 is provided on the hitch 125 of the grass dividing body support section 120. According to such a configuration, the position of the horizontal guide plate part 160 is maintained without being affected by the position adjustment of the grass dividing plate 21, so that the horizontal guide plate part 160 can divide the grass regardless of the position of the grass dividing plate 21. You can get grass effect. Thereby, even by adjusting the position of the grass dividing plate 21, it is possible to prevent plants split to the left and right from coming into contact with the sensor unit 45 due to the grass dividing action of the horizontal guide plate section 160. You can work with peace of mind.

The cutting height detection device 40 also includes a sensor cover 170 that covers the detection sensor 43 attached to the device main body 41. According to such a configuration, it is possible to protect the detection sensor 43 and the connection portion of the wire harness 80 to the detection sensor 43 from seeds, foreign matter, etc. that try to approach the device main body 41 as the aircraft moves. can. This makes it possible to suppress problems such as damage to the detection sensor 43 itself and the signal transmission path to the detection sensor 43.

The embodiment described above is an example of the present invention, and the present invention is not limited to the embodiment described above. Therefore, it goes without saying that various changes can be made to the embodiments other than those described above, depending on the design, etc., as long as they do not deviate from the technical idea of the present invention. Furthermore, the effects described in the present disclosure are merely examples and are not limiting, and other effects may also be present.

In the embodiment described above, the sensor cover 170 is provided on the right side of the device main body 41 and on the inside (left side) of the right side surface portion 44c of the unit support 44, which is a protection member. It may also be configured to serve as a protection member. In the case of such a configuration, for example, the range of coverage of the device body 41 by the sensor cover 170 may be expanded, or the right side portion 172 of the sensor cover 170 may be placed in the same position as the right side portion 44c of the unit support 44 with respect to the device body 41. By locating the sensor cover 170 on the left and right outer sides (right side), the sensor cover 170 can guide the plants etc. that have been split left and right by the grass dividing plate 21 to the right outer side. According to such a configuration, the right side portion 44c of the unit support body 44 can be omitted. Specifically, the second support body 47 can be omitted and the unit support body 44 can be configured only by the first support body 46.

Further, the unit support body 44 may also serve as the sensor cover 170. That is, a structure may be adopted in which a cover portion corresponding to the sensor cover 170 is provided as a part of the unit support body 44. In such a configuration, for example, by enlarging the right side surface portion 44c of the unit support 44, a cover portion that covers the detection sensor 43 is provided as a part of the unit support 44. According to such a configuration, the unit support 44 functions as a protection member and a sensor cover according to the present invention, and it is possible to omit providing the sensor cover as a separate member from the unit support 44. .

1 Combine harvester 4 Traveling machine body 5 Reaping section 21 Grass division board (grass division body)
40 Cutting height detection device 41 Device main body 42 Grounding body 43 Detection sensor 44 Unit support (protective member)
44a Left side part (side plate part)
44c Right side part (side plate part)
45 Sensor unit 51 Case 80 Wire harness 120 Grass support part 121 Grass divider body 122 Rib plate part 124 Hitch support plate 125 Hitch 151 Left bending surface part (bending part)
152 Right bent surface part (bent part)
160 Horizontal guide plate section (front guide section)
170 Sensor cover 201 Left front guide plate part (upper guide part)
202 Left rear guide plate part (upper guide part)
203 Right front guide plate part (upper guide part)
204 Right rear guide plate part (upper guide part)

Claims (4)

A combine harvester comprising a reaping part that is movable up and down with respect to a traveling machine body, and a cutting height detection device for detecting the height of the reaping part,
The cutting height detection device includes:
A device body that is movable up and down,
a grounding body rotatably supported with respect to the device main body;
a detection sensor that detects the amount of rotation of the grounding body,
The height of the reaping section is detected based on a detection signal from the detection sensor,
The apparatus further includes a protection member that supports the apparatus main body with respect to a grass cutting body supporting part that supports the grass cutting body provided at the front part of the reaping part, and protects the apparatus body from the front side and both left and right sides. combine. The combine harvester according to claim 1, wherein the protection member is provided so as to be rotatable with respect to the grass cutting body support part integrally with the device main body with the front-rear direction as an axial direction. The protection member includes left and right side plate parts that are plate-shaped parts with the left and right direction as the thickness direction, as parts that protect the device main body from both the left and right sides,
According to claim 1 or 2, bent portions are provided on the rear sides of the left and right side plate portions, the bent portions being bent in directions facing each other so as to be located at the rear of the device main body. combine harvester. Claims 1 to 3, characterized in that the weed support section is provided with a front guide section that is located in front of the device main body and guides the grain culms to the left and right outside as the machine moves forward. The combine harvester according to any one of the items.

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