CN116075215A - Combine harvester - Google Patents

Abstract

With the structure for detecting the cutting height of the cutting portion, it is possible to eliminate a problem caused by a force acting on the ground body from the ground or the stub, and to detect the cutting height with high accuracy. A combine harvester is provided with: a cutting part which is arranged on the running machine body in a lifting manner; and a harvest height detection device 40 for detecting the height of the harvest section, wherein the harvest height detection device 40 comprises: a device main body 41 provided on the front fixed shaft 61 so as to be rotatable up and down; a grounding body 42 rotatably supported by a rear rotation shaft 62 located behind the front fixed shaft 61; and a detection sensor 43 that detects the rotation amount of the ground body 42 about the rear rotation shaft 62, and detects the height of the cutting portion based on the detection signal of the detection sensor 43.

Description

Combine harvester

Technical Field

The present invention relates to a combine harvester having a harvesting part with an adjustable height.

Background

In general, a combine harvester includes a harvesting unit on the front side of a traveling machine body, and a threshing unit on the traveling machine body, and performs harvesting of stalks by the harvesting unit, threshing by the threshing unit, and the like while traveling. In the past, there are the following structures in a combine: the cutting unit is provided to be liftable and lowerable with respect to the traveling machine body, and the cutting height is controlled as the height of the cutting unit from the ground, and therefore, the cutting unit is provided with a cutting height detection device (for example, refer to patent literature 1). In this configuration, the cutting height is automatically controlled by controlling the operation of the lifting device such as the hydraulic cylinder that lifts the cutting unit based on the detection signal of the cutting height detection device.

Patent document 1 discloses the following structure: the harvesting height detection device includes a sensor unit disposed at a rear lower side of the grain splitting body provided in the harvesting unit. The sensor unit is provided with: a unit main body which is rotatably mounted to the seedling dividing body up and down via a bracket; a potentiometer for detecting a rotational position of the unit body; and a grounding body which is mounted on the unit main body in a manner of being capable of rotating up and down. The unit main body is rotatably supported by the bracket using a 1 st rotation shaft positioned at the front portion thereof. The grounding body is rotatably supported by the unit body by a 2 nd rotation shaft positioned at the rear part of the unit body, and protrudes downward from the rear part of the unit body.

According to the sensor unit disclosed in patent document 1, when the ground contact body whose rearward rotation is restricted is pressed by the ground surface and the stub during normal running, that is, when the machine body is advanced, the ground contact body and the unit body are rotated up and down about the 1 st rotation axis integrally, and the height of the grain splitting body relative to the ground surface is detected based on the rotational position of the unit body. On the other hand, when the machine body is retracted, the ground contact body is pressed by the ground or the stub to rotate forward and contact the lower surface of the unit body, and the ground contact body is pressed from above by the stub or the like to rotate integrally with the unit body upward about the 1 st rotation axis.

Prior art literature

Patent literature

Patent document 1: japanese patent No. 5672293

Disclosure of Invention

In the sensor unit disclosed in patent document 1, the rotation of the unit body is detected by restricting the rearward rotation of the ground contact body and by rotating the unit body up and down around the 1 st rotation axis together with the ground contact body during normal running. According to this structure, there are the following problems.

According to the structure of the sensor unit disclosed in patent document 1, a situation in which the unit body always rotates up and down is likely to occur during normal running. Thus, the unit body is easily damaged. In addition, there are cases where: the mud or the like is jammed between the grain separating body and the unit main body, for example, and prevents the unit main body from rotating upward during normal running. In this case, since the rearward rotation of the ground contact body is restricted, the ground contact body receives excessive force from the ground surface or the stub, and there is a possibility that a defect such as breakage of the ground contact body may occur.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a combine harvester in which a structure for detecting a harvesting height of a harvesting portion can eliminate a problem caused by a force acting on a ground contact body from the ground or a stub, and can detect the harvesting height with high accuracy.

The combine harvester according to the present invention comprises: a cutting part which is arranged on the running machine body in a lifting manner; and a harvesting height detection device for detecting the height of the harvesting part, wherein the harvesting height detection device comprises: a device main body provided on the 1 st axis so as to be rotatable up and down; a grounding body rotatably supported by a 2 nd shaft located behind the 1 st shaft; and a detection sensor that detects the amount of rotation of the ground body about the 2 nd axis, wherein the harvesting height detection device detects the height of the harvesting portion based on a detection signal of the detection sensor.

In a combine harvester according to another aspect of the present invention, the ground engaging body is configured to: the detection sensor detects an amount of rotation of the ground contact body rearward from a predetermined reference position when the ground contact body is positioned at the predetermined reference position in a state of not receiving an external force with respect to the rotation about the 2 nd axis.

In the combine according to another aspect of the present invention, the ground contact body rotates about the 2 nd axis with respect to the device body in a state where the rotation about the 1 st axis is stopped in a state where the ground contact body is located further rearward than the reference position.

In a combine harvester according to another aspect of the present invention, the device main body is configured to: the grounding body rotates around the 1 st axis in association with the rotation of the grounding body in a state of being located further forward than the reference position.

In the combine according to another aspect of the present invention, the harvesting height detecting device includes a 3 rd shaft that rotates in response to transmission of the rotational force of the 2 nd shaft, and the detecting sensor detects the rotation amount of the ground engaging body about the 2 nd shaft based on the rotation amount of the 3 rd shaft.

In accordance with another aspect of the present invention, there is provided a combine harvester, wherein the harvesting height detection device includes: a 1 st transmission member rotatably supported by the 2 nd shaft; and a 2 nd transmission member that receives transmission of the rotational force of the 2 nd shaft from the 1 st transmission member, and the 3 rd shaft receives transmission of the rotational force of the 2 nd shaft via the 1 st transmission member and the 2 nd transmission member.

In the combine harvester according to another aspect of the present invention, the harvesting height detecting device includes a driving member fixed to the 2 nd shaft, the driving member includes a 1 st transmission member input unit that transmits the 2 nd shaft rotation caused by the rearward rotation of the ground contact body to the 1 st transmission member, and the 1 st transmission member rotates about the 2 nd shaft.

In accordance with another aspect of the present invention, there is provided a combine harvester, wherein the harvesting height detection device includes: a 3 rd transmission member rotatably supported by the 2 nd shaft; a 4 th transmission member which is supported by the 3 rd shaft so as to be rotatable relative to each other and which receives transmission of rotational force of the 2 nd shaft from the 3 rd transmission member; and a rotation support unit that receives the rotation power of the 4 th transmission member and rotates the device body about the 1 st axis.

In the combine harvester according to another aspect of the present invention, the harvest height detection device includes a drive member fixed to the 2 nd shaft, the drive member includes a 3 rd transmission member input unit, and the 3 rd transmission member input unit transmits the 2 nd shaft rotation caused by the forward rotation of the ground contact body to the 3 rd transmission member, so that the 3 rd transmission member rotates around the 2 nd shaft.

In the combine according to another aspect of the present invention, a front shaft support portion and a rear shaft support portion that support the harvest height detection apparatus rotatably about a front-rear axis are provided in front of and behind the harvest height detection apparatus.

In accordance with another aspect of the present invention, there is provided a combine harvester, wherein the harvesting section has a seedling dividing section including: a seedling separating frame arranged at the lower part of the cutting part; a seedling dividing plate provided at a front side of the seedling dividing frame; and a support frame fixed to the seedling dividing frame, wherein the front shaft support part is provided at the rear side of the seedling dividing plate, and the rear shaft support part is provided at the support frame.

In accordance with another aspect of the present invention, in the combine harvester, the harvesting height detecting device includes a device body supporting member that supports the device body so as to be rotatable up and down, and the front shaft supporting portion includes: a front support part which is arranged at the rear side of the seedling dividing plate; and a front support shaft portion provided at a front end portion of the apparatus main body support member and supported by the front support portion, the rear shaft support portion having: a rear support portion provided to the support frame; and a rear support shaft portion provided at a rear end portion of the apparatus main body support member and supported by the rear support portion.

In the combine according to another aspect of the present invention, the front bearing portion is located forward of the grain separating frame, and at least a part of the device body is located forward of a front end of the grain separating frame.

In the combine according to another aspect of the present invention, the seedling dividing portion includes a seedling dividing plate support member for supporting the seedling dividing plate on the seedling dividing frame, the seedling dividing plate support member is provided in a shape inclined to be high in front and high in rear, the support frame includes an inclined frame portion inclined to be high in front and low in rear from a rear side of the seedling dividing plate support member, the seedling dividing plate support member and the inclined frame portion are formed in a mountain shape with an upper side being a convex side in a side view, and the cutting height detecting device is disposed between the seedling dividing plate support member and the inclined frame portion.

In the combine according to another aspect of the present invention, the device body support member has a portion overlapping at least a part of the device body when viewed in the axial direction of the front-rear direction, at the front end portion and the rear end portion, respectively.

Effects of the invention

According to the present invention, the structure for detecting the cutting height of the cutting unit can eliminate a problem caused by a force acting on the ground body from the ground surface or the stub, and can detect the cutting height with high accuracy.

Drawings

Fig. 1 is a left side view of a combine harvester according to an embodiment of the invention.

Fig. 2 is a right side view of a combine harvester according to an embodiment of the invention.

Fig. 3 is a plan view showing a structure of a harvesting unit of the combine harvester according to the embodiment of the present invention.

Fig. 4 is a perspective view showing a structure of a harvesting height detection device of a combine harvester according to embodiment 1 of the present invention and a vicinity of an installation portion thereof.

Fig. 5 is a left side view showing the structure of the seedling dividing portion and the harvest height detecting device according to embodiment 1 of the present invention.

Fig. 6 is a perspective view showing the structure of the cutting height detection device according to embodiment 1 of the present invention.

Fig. 7 is a right side view showing the structure of the seedling dividing portion and the harvesting height detecting device according to embodiment 1 of the present invention.

Fig. 8 is a perspective view showing a sensor unit according to embodiment 1 of the present invention.

Fig. 9 is a left side view showing a cutting height detection device according to embodiment 1 of the present invention.

Fig. 10 is a plan view showing a cutting height detection device according to embodiment 1 of the present invention.

Fig. 11 is a left side view showing an internal structure of a device body of the harvest height detection device according to embodiment 1 of the present invention.

Fig. 12 is a plan view showing an internal structure of a device body of the harvesting height detecting device according to embodiment 1 of the present invention.

Fig. 13 is a left side view of the cutting height detection device according to embodiment 1 of the present invention, in which a part of the internal structure of the device main body is omitted.

Fig. 14 is a perspective view showing an internal structure of a device body of the harvesting height detecting device according to embodiment 1 of the present invention.

FIG. 15 is a combined cross-sectional view showing the A-B-C position of FIG. 11.

Fig. 16 is an explanatory view of a position adjustment mechanism for a front fixed shaft according to embodiment 1 of the present invention.

Fig. 17 is a top cross-sectional view showing the structure of the front shaft support section according to embodiment 1 of the present invention.

Fig. 18 is an explanatory diagram showing an operation of the harvesting height detecting device when the combine according to embodiment 1 of the present invention is retracted.

Fig. 19 is an explanatory view of the operation of the harvesting height detection device when the combine according to embodiment 1 of the present invention is advanced from the time of backward movement.

Fig. 20 is an explanatory diagram showing an operation of the harvest height detection apparatus when the harvest device descends when the body of the combine according to embodiment 1 of the present invention is stopped.

Fig. 21 is a left-right rotation explanatory view of the cutting height detection device according to embodiment 1 of the present invention.

Fig. 22 is a left side view showing a structure of a harvesting height detecting apparatus of a combine harvester according to embodiment 2 of the present invention and a vicinity of an installation portion thereof.

Fig. 23 is a perspective view showing the structure of a harvesting height detecting apparatus according to embodiment 2 of the present invention.

Fig. 24 is a perspective view showing the structure of a harvesting height detecting device according to embodiment 2 of the present invention.

Fig. 25 is a left side view showing an internal structure of a device body of the harvest height detection device according to embodiment 2 of the present invention.

Fig. 26 is a plan view showing an internal structure of a device body of the cutting height detection device according to embodiment 2 of the present invention.

FIG. 27 is a combined cross-sectional view showing the X-Y-Z position of FIG. 25.

Fig. 28 is a top cross-sectional view showing the structure of a front shaft support section according to embodiment 2 of the present invention.

Fig. 29 is a top cross-sectional view showing the structure of a rear shaft support section according to embodiment 2 of the present invention.

Fig. 30 is an explanatory diagram of the operation of the cutting height detection device according to embodiment 2 of the present invention.

Detailed Description

The present invention relates to a harvesting height detection device for detecting the height of a harvesting part in a combine harvester having a harvesting part with adjustable height, and the precision of the harvesting height detection device is intended to be improved by carefully designing the structure of the harvesting height detection device. Hereinafter, embodiments of the present invention will be described _。

[ Integrated Structure of combine harvester ]

First, the overall structure of the combine harvester 1 according to the present embodiment will be described with reference to fig. 1 and 2. In the following description, the left and right sides of the combine 1 when facing the front of the combine 1 (left side in fig. 1) are referred to as the left and right sides of the combine 1, respectively.

As shown in fig. 1 and 2, a combine harvester 1 according to the present embodiment includes: a traveling unit 2 of a crawler traveling device having a pair of left and right crawler units 3, 3; and a traveling body 4 supported by the traveling unit 2. The traveling body 4 includes a frame-like structure of the body of the combine 1. The combine 1 includes an engine 11 as a drive source mounted on a traveling machine body 4.

A harvesting unit 5 for harvesting and taking in the ear stalks of rice, wheat, etc. in the field while harvesting them is provided at the front part of the traveling machine body 4. A threshing part 6 for threshing the ear stalks cut by the cutting part 5, and a grain box 7 for storing grains taken out from the threshing part 6 are arranged in a lateral arrangement on the traveling machine body 4. The threshing part 6 is arranged at the left side of the machine body, and the grain box 7 is arranged at the right side of the machine body. The combine harvester 1 performs harvesting of the ear stalks by the harvesting unit 5, threshing by the threshing unit 6, and the like while traveling by the traveling unit 2.

Each crawler belt portion 3 constituting the traveling portion 2 has: a crawler frame 3a extending in the front-rear direction below the traveling body 4; a variety of rotating bodies such as a drive sprocket 3b supported by the track frame 3a; and a crawler belt 3c wound around the rotating body. The crawler belt 3 is driven by the drive sprocket 3b through power transmission from the engine 11.

The harvesting unit 5 is driven by a driving force from the engine 11, and harvests the stalks and conveys the harvested stalks to the threshing unit 6. The harvesting unit 5 is provided over substantially the entire body width of the combine harvester 1 on the front side of the traveling body 4. The cutting unit 5 is provided so as to be capable of being lifted and lowered relative to the traveling machine body 4. Fig. 2 shows a state in which the harvesting unit 5 is lowered relative to the state shown in fig. 1.

The threshing unit 6 includes: a threshing cylinder 6a having a front-rear direction as a rotation axis direction; and a spike stalk supply device provided on the left side of the threshing cylinder 6 a. The ear stalk feeder conveys the ear stalks rearward in a recumbent posture in which the ear stalks cut by the cutting unit 5 are held and the ear is slightly positioned on the threshing cylinder 6a side. The ear stalk supply device is composed of: a feed chain 6b wound around a plurality of sprockets having a left-right direction as a rotation axis direction; and a stalk feeding gripping body 6c that grips the roots of the stalks in cooperation with the feed chain 6 b.

A screening unit 8 for screening the treated material subjected to threshing by the threshing unit 6 is provided below the threshing unit 6 on the traveling machine body 4. The screening unit 8 includes a swing screening device 8a, a wind screening device, and a grain conveying device. The screening unit 8 performs the swing screening of the processed objects falling from the threshing unit 6 by the swing screening device 8a, and performs the wind screening of the processed objects after the swing screening by the wind screening device. The screening unit 8 conveys grains in the processed product subjected to wind screening toward the grain box 7 and to the right by the grain conveying device, and blows off straw scraps, dust, and the like rearward by the wind screening device and discharges them to the outside of the machine body. The grains conveyed toward the grain tank 7 by the grain conveying apparatus are stored in the grain tank 7.

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

A discharged straw treatment unit 10 for treating the discharged straw subjected to threshing by the threshing unit 6 is provided on the traveling machine body 4 and behind the threshing unit 6. The discharged straw processing part 10 has a discharged straw conveying device 10a and a discharged straw cutting device 10b. The discharged straw conveying device 10a conveys the ear stalks (discharged ear stalks) threshed by the threshing unit 6 backward and discharges them to the outside of the machine body, or conveys them to the discharged straw cutting device 10b. The discharged straw cutting device 10b cuts off the discharged spike rod conveyed from the discharged straw conveying device 10a and discharges the cut spike rod to the outside of the machine body.

A driving unit 14 covered with a cab 13 is provided on the right side of the harvesting unit 5 and in front of the grain box 7 on the traveling body 4. A steering wheel portion 15 as a steering operation portion is provided in the front portion of the driver portion 14, a driver seat 16 is provided behind the steering wheel portion 15, and various operation elements are disposed laterally of the driver seat 16.

A prime mover including the engine 11 is provided below the driving portion 14. The 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 harvester 1 via a transmission device or the like.

The cutting unit 5 will be described with reference to fig. 1 to 3. The harvesting unit 5 has a harvesting support frame 20 as a harvesting frame, and is configured such that a seedling dividing plate 21, a seedling supporting device 22, a raking device 23, a cutter device 24, a stalk conveying device 25, and the like are supported by the harvesting support frame 20. Power is transmitted from the engine 11 to operate the devices included in the harvesting unit 5.

The seedling dividing plate 21 constitutes a seedling dividing portion 50 provided in the harvesting portion 5, is provided at the tip of the harvesting portion 5, has a tip-thin shape, and divides the stalks planted in the field. The seedling raising device 22 is provided at the rear side of the seedling dividing plate 21, and causes a plurality of teeth 22a connected by a chain to perform an operation to raise the lodged spike stalks.

The raking device 23 is provided at the rear side of the seedling raising device 22, and is configured to rake the stalks, including a chain-driven conveying mechanism 23a, a rotary loader (packer) 23b, and the like. In fig. 3, only the structure portion of the raking device 23 provided at the left end is shown, and the other structure portions are omitted.

The cutter device 24 is a pusher-type device for cutting the roots and stems of the raised ear stalks. The ear stalk conveying device 25 conveys the cut ear stalks, merges the multi-ridge cut ear stalks, conveys the cut ear stalks in a clamped manner in a rear upper direction, and conveys the cut ear stalks in a horizontal posture to a start end portion of a feed chain 6b of the threshing unit 6.

As shown in fig. 1, the cutting support frame 20 is supported by a support frame 26 disposed in a front side of the traveling machine body 4 so as to be low in front and high in rear. The support frame 26 is provided at a substantially central portion in the left-right direction of the machine body, and the cutting support frame 20 is provided on the front side of the support frame 26.

As shown in fig. 3, the harvesting support frame 20 has: a lateral frame 31 extending in the left-right direction of the machine body; and a plurality of grain separating frames 32, 34 extending forward from the transverse frame 31. The cutting support frame 20 is supported by the support frame 26 at the cross frame 31.

The cross frame 31 is a linear frame portion formed of square tubular members. The seedling dividing frames 32 and 34 are frame portions made of circular tubular members, have a predetermined bent shape or curved shape, and extend in the front-rear direction in a plan view. The seedling dividing frames 32 and 34 are supported in cantilever fashion by being fixedly supported at the rear end or rear portion by the cross frame 31.

The plurality of grain separating frames 32 and 34 are arranged in parallel with a predetermined interval therebetween in the left-right direction. The grain separating frames 32 and 34 are provided to be 1 more than the number of cutting ridges of the combine harvester 1. The combine harvester 1 according to the present embodiment is provided with 8 grain separating frames 32 and 34 by cutting 7 ridges. The left-hand division frame 34 of the 8 division frames 32, 34 has a different shape from the other (7) division frames 32.

A seedling raising device 22 is disposed between the laterally adjacent seedling dividing frames 32, 34, and a total of 7 seedling raising devices 22 are provided. The lower part of the seedling raising device 22 is connected and supported to the front parts of the seedling dividing frames 32 and 34 via support struts 33 (see fig. 4) and the like. Further, a seedling dividing plate 21 is attached to the front ends of the seedling dividing frames 32 and 34. Further, as the plurality of seedling dividing plates 21, 2 seedling dividing plates 21 of a larger seedling dividing plate 21 and a smaller seedling dividing plate 21 are provided in a predetermined arrangement.

The cutting unit 5 having the above-described structure is rotatably mounted on the traveling machine body 4 about a predetermined axis by a hydraulic cylinder 18 as a lifting device (see fig. 1). That is, the harvesting unit 5 is provided so as to be capable of being lifted and lowered relative to the traveling machine body 4 by a turning motion based on the telescopic motion of the hydraulic cylinder 1. The hydraulic cylinder 18 is provided between the traveling machine body 4 and the support frame 26, and the rear end portion of the support frame 26 is supported rotatably about a left-right axis as a fulcrum of the lifting rotation of the harvesting unit 5.

As described above, the combine harvester 1 has the harvesting unit 5 capable of being lifted and lowered relative to the traveling machine body 4. The combine harvester 1 further includes a harvesting height detection device 40 for controlling the harvesting height of the harvesting unit 5 from the ground G1. In this configuration, the cutting height is automatically controlled by controlling the operation of the hydraulic cylinder 18 that moves up and down the cutting unit 5 based on the detection signal of the cutting height detection device 40.

The operation of the hydraulic cylinder 18 is controlled by the operation control of the solenoid valve as a control valve. The control unit provided in the combine harvester 1 controls the harvest height by controlling the operation of the control valve of the hydraulic cylinder 18 based on the detection signal of the harvest height detection device 40.

The automatic control of the harvest height automatically controls the lifting and lowering of the harvest 5 by controlling the operation of the control valve of the hydraulic cylinder 18 so as to maintain the harvest height of the harvest 5 at a set value based on the detection signal of the harvest height detection device 40. The driving unit 14 is provided with an operation unit for adjusting the cutting height, and for example, in automatic control of the cutting height, control is performed such that adjustment of the cutting height based on an operation of the operation unit is prioritized.

As described above, the combine harvester 1 includes: a harvesting part 5 having a seedling dividing part 50 including a seedling dividing plate 21 and provided to be capable of being lifted up and down with respect to the traveling machine body 4; and a harvest height detection device 40 for detecting a harvest height that is the height of the harvest section 5. In the present embodiment, the harvesting height detecting device 40 is disposed on the rear side of the left-end dividing plate 21A of the 8 dividing plates 21. The left-hand seedling-dividing plate 21A is supported by a seedling-dividing frame 34 located at the left-hand end. Further, the left-end seedling-dividing plate 21A is a larger seedling-dividing plate 21 among the 2 seedling-dividing plates 21.

[ embodiment 1 ]

Embodiment 1 of the cutting height detecting device 40 and its supporting structure will be described with reference to fig. 4 to 21.

(Structure of cutting height detection device)

As shown in fig. 4 to 17, the cutting height detection device 40 includes: a device body 41, a grounding body 42, a detection sensor 43, and a unit support body 44 as a device body support member. In the cutting height detection device 40, a sensor unit 45 (see fig. 8) integrally formed from a device main body 41, a grounding body 42, and a detection sensor 43 is supported by a unit support body 44 so that the sensor unit 45 can rotate about a horizontal axis. The unit support body 44 is rotatably supported by the seedling dividing portion 50 about an axis in the front-rear direction.

The cutting height detecting device 40 is supported by the grain separating portion 50 so as to be rotatable about the axis in the front-rear direction, and the sensor unit 45 is supported by the unit support body 44 so as to be rotatable about the axis in the left-right direction. The rotation of the cutting height detecting device 40 about the front-rear direction axis and the rotation of the sensor unit 45 about the left-right direction axis are performed in accordance with an external force acting on the cutting height detecting device 40. Hereinafter, the state in which the external force does not act on the cutting height detecting device 40 is referred to as a reference state, and the cutting height detecting device 40 in the reference state will be described unless otherwise described.

In the sensor unit 45, the device main body 41 has a structure in which various gears, springs, and the like are supported on a predetermined shaft in a case 51 made of, for example, a metal casting. The case 51 has a left-right split structure including a right case 52 constituting a main body of the case 51, and a left case 53 covering the left side of the right case 52 in a cover shape. The right case 52 and the left case 53 are fixed to each other by fixing bolts 55 at 4 portions around the case 51 in a side view. The fixing bolt 55 passes through the bolt hole of the left housing 53 from the left side of the housing 51, and is screwed into the screw hole 52a of the right housing 52 (see fig. 11).

As shown in fig. 9, the case 51 has an approximately rectangular outer shape having a longitudinal direction in a front-rear direction (left-right direction in fig. 9) in a side view. Fixing portions by fixing bolts 55 are provided near four corners of the side view outer shape of the housing 51. The case 51 has a curved shape with an upper side being convex and a lower side being concave in a side view.

With respect to the sensor unit 45, the ground body 42 protrudes downward from the rear side of the rear end of the housing 51. The detection sensor 43 is provided so as to be attached to the right side surface of the housing 51.

The unit support 44 is a member formed by bending a strip-shaped plate-like member in a predetermined shape in a plan view, and extends in the front-rear direction. The unit support body 44 has: a left side surface portion 44a elongated in the front-rear direction; a front surface portion 44b formed in a right-angle shape from a front end portion of the left side surface portion 44a toward the right side; a right front side surface portion 44c formed in a right angle shape from a right end portion of the front surface portion 44b toward the rear; and a rear surface portion 44d formed in a right-angle shape from a rear end portion of the left side surface portion 44a toward the right side. The faces are all longitudinal faces, and have a substantially constant width (dimension in the up-down direction) as a whole.

The left side surface portion 44a is a front-rear elongated substantially rectangular plate-like portion having a plate thickness direction in the left-right direction. The left side surface portion 44a has a shape in which the width gradually narrows from the front side toward the rear side at the rear portion thereof. The front surface portion 44b is a plate-like portion having a plate thickness direction in the front-rear direction. The front surface portion 44b has a dimension of about 1/4 to 1/3 of the length of the left side surface portion 44a in the front-rear direction in the left-right direction.

The right front side surface portion 44c is a plate-like portion having a plate thickness direction in the left-right direction, and faces the front end portion of the left side surface portion 44a in the left-right direction. The right front side surface 44c has a length of about 1/6 to 1/5 of the length of the left side surface 44a in the front-rear direction. The rear surface portion 44d is a plate-like portion having a plate thickness direction in the front-rear direction, and faces the front surface portion 44b in the front-rear direction. The rear surface portion 44d has a dimension longer than half the length of the front surface portion 44b in the left-right direction.

The unit support 44 has the following shape: the left side surface portion 44a, the front surface portion 44b, the right front side surface portion 44c, and the rear surface portion 44d are formed in a rectangular shape that is long in the front-rear direction and most of the right rear side is open in a plan view.

The sensor unit 45 is provided on the unit support 44 so as to be positioned in front of the space portion surrounded by the unit support 44. So that substantially the entire sensor unit 45 is located within a rectangular area along which the outer shape of the unit support 44 is seen in plan view.

The sensor unit 45 is arranged such that the front end of the housing 51 is located right behind the front surface portion 44b and between the front end of the left side surface portion 44a and the right front side surface portion 44 c. In the front-rear direction, substantially half of the rear side of the left side surface portion 44a is positioned further to the rear than the rear end of the housing 51.

In the sensor unit 45, the middle portion of the housing 51 in the up-down direction overlaps the left side surface portion 44a of the unit support body 44 in a left-side view. In the sensor unit 45, the front-rear central portion of the housing 51 is exposed upward with respect to the left side surface portion 44a and the lower portion of the housing 51 is exposed downward in left-side view (see fig. 9).

The respective portions of the sensor unit 45 are explained. The apparatus main body 41 is provided to be rotatable up and down on a front fixed shaft 61 as a 1 st axis. The front fixed shaft 61 is a support shaft having an axial direction in the left-right direction, and rotatably supports the sensor unit 45 about the 1 st axis P1.

The front fixed shaft 61 is located near the front end of the housing 51 in the apparatus main body 41. The front fixing shaft 61 extends from the right front side surface 44c to the left with the right end portion fixed to the right front side surface 44c of the unit support 44. That is, the front fixed shaft 61 is a fixed shaft supported by the right front surface 44c in a cantilever manner. The front fixed shaft 61 may be a shaft that is supported in a cantilever shape so that its left end portion is fixed to the front end portion of the left side surface portion 44a of the unit support body 44, or may be a shaft that is fixed to both sides of the front end portion of the left side surface portion 44a and the right front side surface portion 44c and that is installed between the surface portions.

The front fixed shaft 61 is supported by the housing 51 so as to be rotatable relative to each other. That is, the housing 51 is rotatably supported by the front fixed shaft 61. As shown in fig. 15, the front fixed shaft 61 penetrates a cylindrical boss 52h formed at the front of the right housing 52 with respect to the right housing 52, and is supported by the boss 52h via a bushing 47 as a bearing member. The front fixed shaft 61 is supported by the left housing 53 in a state in which the left end portion is inserted into and fitted into a shaft support hole 53a formed in the front portion of the left housing 53 via the bush 48. Further, an annular oil seal 49 is provided at a base portion of the right housing 52 where the front fixed shaft 61 protrudes rightward, so as to penetrate the front fixed shaft 61.

In this way, the sensor unit 45 is provided on the front fixed shaft 61 (see arrow A1 in fig. 9) as a fixed shaft fixedly provided on the unit support body 44 so as to be vertically rotatable in a cantilever-supported state with respect to the axial direction in the left-right direction. That is, in the present embodiment, the unit support body 44 corresponds to: the apparatus main body 41 of the sensor unit 45 is supported by a front fixed shaft 61 as an apparatus main body support member capable of rotating up and down.

As shown in fig. 11 and 12, with respect to the rotation of the sensor unit 45 about the 1 st axis P1 with respect to the unit support 44, the sensor unit 45 is biased in the downward rotation direction by the housing return spring 56 and the fixing plate 57.

The fixing plate 57 is a plate-like portion perpendicular to the axial direction of the front fixing shaft 61, and is fixedly provided at the left side portion of the front fixing shaft 61. That is, the fixing plate 57 is a portion integral with the front-side fixing shaft 61. The fixing plate 57 is located on the right side of the bushing 48. The fixing plate 57 has an acutely angled support arm portion 57a protruding toward the rear side from a main body portion along a circular outer shape, and has a substantially tear-drop shape as a whole.

The housing return spring 56 is a so-called torsion spring, and has protruding portions 56a, 56b on both end sides of the coil-like portion. The housing return spring 56 is located on the right side of the fixing plate 57, and is provided in a state in which the right side portion of the coil-shaped portion is externally fitted to the boss 52h and the front side fixing shaft 61 is penetrated.

The housing return spring 56 causes one protruding portion 56a located on the right side of the coil-shaped portion to abut against the lower surface 52b of the right housing 52, and causes the other protruding portion 56b located on the left side of the coil-shaped portion to be locked to the fixing plate 57. The other protruding portion 56b is bent to the left at its distal end portion, and is locked to the fixing plate 57 by penetrating an locking hole 57b formed in the support arm portion 57a of the fixing plate 57.

The case return spring 56 applies a force to press the right case 52 downward to the fixing plate 57 fixedly provided to the front fixing shaft 61 by a force in a direction in which the protruding portions 56a and 56b are separated from each other. Thereby, the sensor unit 45 is biased in a direction of rotating downward about the shaft of the front fixed shaft 61.

On the other hand, regarding the rotation of the sensor unit 45 relative to the unit support body 44, the downward rotation of the sensor unit 45 is restricted to the reference state position by the locking projection 53b provided to the housing 51. The locking projection 53b is formed as a part of the left housing 53 so as to protrude leftward from an upper end portion of a front-rear center portion of the left housing 53. In the reference state, the locking projection 53b is brought into contact with the upper edge of the left side surface portion 44a of the unit support body 44, so that the sensor unit 45 cannot relatively rotate downward with respect to the unit support body 44.

In this way, the sensor unit 45 is restricted from rotating downward with respect to the unit support 44 from the reference state in a state in which the sensor unit is biased in the downward rotation direction with respect to the rotation about the front fixed shaft 61. Therefore, an external force that causes the sensor unit 45 to rotate upward about the front fixed shaft 61 acts on the sensor unit 45 to cause the sensor unit 45 to rotate upward against the urging force of the housing return spring 56, and by releasing the external force, the sensor unit 45 is automatically rotated downward by the urging force of the housing return spring 56, and returns to the position in the reference state by the locking action of the locking protrusion 53 b.

In the cutting height detecting device 40 according to the present embodiment, the front fixed shaft 61 that supports the sensor unit 45 on the unit support 44 is provided so that the relative position with respect to the rotational direction of the unit support 44 can be adjusted. The position adjustment mechanism of the front fixed shaft 61 will be described with reference to fig. 10, 14, and 16.

The front fixed shaft 61 is formed of a rod-shaped member having a circular cross-sectional shape, and a right end portion thereof is rotatably fitted in a circular shaft hole 44e (see fig. 7) formed in a lower portion of the right front surface portion 44c of the unit support 44. A shaft support plate 46 that overlaps the inner side (left side) of the right front side surface portion 44c is fixedly provided at the right end portion of the front side fixed shaft 61. The shaft support plate 46 is provided as a portion that rotates integrally with the front fixed shaft 61. The shaft support plate 46 is located within the outer shape of the right front side surface portion 44c in side view. In fig. 14, the shaft support plate 46 is not shown.

The shaft support plate 46 is fastened and fixed to the right front side surface portion 44c by a fixing bolt 58. The fixing bolt 58 penetrates the right front side surface portion 44c from the right side at a position above the front side fixing shaft 61, and is screwed into a nut portion 46a provided on the left side of the shaft support plate 46. The bolt hole 44f through which the fixing bolt 58 passes is a long hole for allowing the front fixed shaft 61 to rotate about the 1 st axis P1 with respect to the right front side surface 44c.

In such a configuration, the shaft support plate 46 is rotated about the 1 st axis P1 (see arrow B1 in fig. 16) in a state where the fastening of the fixing bolt 58 is released, and the position of the front fixed shaft 61 with respect to the rotational direction of the unit support body 44 is adjusted. As for the positional adjustment of the front fixed shaft 61, a stopper screw 59 for positioning the front fixed shaft 61 is provided.

As shown in fig. 16, the stopper screw 59 is provided at a lower portion of a corner portion constituted by the front surface portion 44b and the right front side surface portion 44c of the unit support body 44 as: a screw hole 60a formed in the inner peripheral side of a cylindrical screw tube 60 having a tube axis direction in the up-down direction is inserted from below. The screw cylinder 60 is fixed to the unit support 44 by welding or the like. The stopper screw 59 has a tapered contact portion 59a at its distal end portion, protrudes upward from the screw tube 60, and contacts the shaft support plate 46 from below. A groove 59b for rotating the stopper screw 59 is formed in an end surface of the stopper screw 59 on the opposite side of the contact portion 59 a.

The shaft support plate 46 is configured as a portion that receives the abutment of the stopper screw 59 such that an acute angle-shaped portion, i.e., the abutted portion 46b, protrudes to the front side (left side in fig. 16). The abutted portion 46b has an abutted surface 46c on the lower side, which receives the abutment of the abutment portion 59a of the stopper screw 59.

The shaft support plate 46 is positioned by the abutment of the abutted portion 46b with the stop screw 59 in relation to the position adjustment of the rotational position of the front fixed shaft 61 with respect to the unit support 44. That is, the stopper screw 59 serves as a stopper with respect to the shaft support plate 46 in relation to the rotation of the front fixed shaft 61 in the left-hand direction with respect to the unit support body 44 in left-hand view, and positions the front fixed shaft 61 via the shaft support plate 46.

Accordingly, the rotation position of the shaft support plate 46 with respect to the unit support body 44 can be adjusted by rotating the stopper screw 59 to adjust the protruding amount of the stopper screw 59 from the upper end of the screw tube 60. The position of the front fixed shaft 61 with respect to the unit support 44 can be adjusted by adjusting the rotational position of the shaft support plate 46.

The grounding body 42 is rotatably supported with respect to the apparatus main body 41 by a rear rotation shaft 62 which is the 2 nd shaft located behind the front fixed shaft 61. The rear rotation shaft 62 is a support shaft having an axial direction in the left-right direction, and supports the ground body 42 rotatably about the 2 nd axis P2 with respect to the housing 51 of the device main body 41.

The rear rotation shaft 62 is located near the rear end of the housing 51 in the apparatus main body 41. The rear rotation shaft 62 is rotatably supported by the housing 51. The rear rotation shaft 62 penetrates a shaft support hole 52c formed in the rear portion of the right housing 52 with respect to the right housing 52, and is supported by the shaft support hole 52c via a bush 65 as a bearing member. The rear rotation shaft 62 is supported by the left housing 53 in a state where the left end portion is inserted and fitted into a shaft support hole 53c formed in the rear portion of the left housing 53 via a bush 66. Further, an annular oil seal 67 is provided at a base portion of the right housing 52 where the rear rotation shaft 62 protrudes rightward, so as to penetrate the rear rotation shaft 62.

The grounding body 42 is fixedly provided at a projecting portion of the rear rotation shaft 62 from the housing 51 to the right. The grounding body 42 has: a grounding body main body portion 42a which is a portion protruding downward from the device main body 41; and a support arm portion 42b which is a support portion with respect to the rear-side rotation shaft 62. The grounding body main body 42a and the support arm 42b are each plate-like portions having a predetermined shape.

The grounding body main body 42a is a scoop-like portion as follows: the plate surface shape displayed in a rear view has a shape in which the width (the dimension in the left-right direction) gradually expands from the upper side toward the lower side. The grounding body main body 42a includes the following parts: the front side of the frame is formed in an obtuse angle shape with the upper and lower central portions as the top and the front side as the convex side in a side view. The bending angle of the upper half and the lower half of the grounding body main body 42a is, for example, about 140 ° to 150 ° in a side view. The ground body main body 42a has a maximum width substantially equal to the lateral width of the case 51, and is located within the lateral width of the case 51 in the lateral direction.

The support arm portion 42b is a vertical wall portion formed in an obtuse angle and bent shape, extends rightward and forward from the upper end portion of the grounding body main body portion 42a located immediately behind the housing 51 so as to extend along the housing 51, and is fixed to the rear rotation shaft 62. The support arm 42b has a front portion as a fixing surface portion in the plate thickness direction in the left-right direction, and a right end portion of the rear rotation shaft 62 penetrates the fixing surface portion so as to be relatively non-rotatable, and is fastened and fixed to the rear rotation shaft 62 by a nut 68 or the like.

In this way, the grounding body 42 is fixed to the rear rotation shaft 62 and rotates integrally with the rear rotation shaft 62 around the 2 nd axis P2. The grounding body 42 is provided so as not to interfere with the housing 51 in the rotation range thereof. Regarding the rotational position of the grounding body 42, the position of the grounding body 42 of the cutting height detection device 40 in the reference state is set as the reference position.

The grounding body 42 rotates as follows as a relative rotation about the rear rotation axis 62 with respect to the apparatus main body 41. That is, the ground contact body 42 rotates (rotates rearward) so that the distal end side moves rearward based on the traction resistance (ground contact sliding resistance) from the ground G1 caused by the forward movement of the combine harvester 1 in a state where the distal end is brought into contact with the ground G1 (see an arrow C1 in fig. 9). On the other hand, the ground contact body 42 rotates (rotates forward) so that the distal end side moves forward based on the ground contact sliding resistance caused by the backward movement of the combine 1 (see arrow C2 in fig. 9).

The detection sensor 43 is a sensor that detects the rotation amount of the ground body 42 around the rear rotation shaft 62. The detection sensor 43 is provided on the intermediate rotation shaft 70 of the 3 rd shaft provided as the cutting height detection device 40, and detects the rotation amount of the ground contact body 42 around the rear rotation shaft 62 based on the rotation amount of the intermediate rotation shaft 70.

The intermediate rotation shaft 70 is a support shaft having an axial direction in the left-right direction, and is supported by the housing 51 of the apparatus main body 41 so as to be rotatable about the 3 rd axis P3. The intermediate rotation shaft 70 is located midway between the front fixed shaft 61 and the rear rotation shaft 62 in the front-rear direction.

The intermediate rotation shaft 70 penetrates a cylindrical boss 52d formed in the front-rear middle portion of the right housing 52 with respect to the right housing 52, and is supported by the boss 52d via a bush 71 serving as a bearing member. The intermediate rotation shaft 70 is supported by the left housing 53 in a state in which the left end portion is inserted and fitted into a shaft support hole 53d formed in the front-rear intermediate portion of the left housing 53 via a bush 72.

The detection sensor 43 is a rotary potentiometer, and detects the rotational position of the ground body 42 via the intermediate rotation shaft 70 and the rear rotation shaft 62. The detection sensor 43 is located between the front fixed shaft 61 and the rear rotating shaft 62 in the front-rear direction. The detection sensor 43 is fixed to the right housing 52 at 2 front and rear positions by bolts 73 screwed into the right housing 52 in a state in which a circular protruding portion 43b formed on the left side of the main body portion is fitted into a circular recessed portion 52e formed on the right side surface portion of the right housing 52.

The detection sensor 43 receives the connection of the right end portion of the intermediate rotation shaft 70, and directly detects the rotation position of the intermediate rotation shaft 70 about the 3 rd axis P3 with the intermediate rotation shaft 70 as a detection shaft. The detection sensor 43 has a signal line 43a extending upward from a main body thereof, and is connected to a control unit provided on the traveling machine body 4 side. The main body may have a connector portion to which the signal line is connected instead of the signal line 43a.

The intermediate rotation shaft 70 is rotated by receiving the transmission of the rotational force of the rear rotation shaft 62 caused by the rotation of the ground contact body 42. The intermediate rotation shaft 70 receives transmission of the rotation force of the rear rotation shaft 62 via a detection drive gear 76 as the 1 st transmission member and a detection driven gear 77 as the 2 nd transmission member provided in the cutting height detection device 40.

The detection drive gear 76 is rotatably supported by the rear rotation shaft 62 in a state where the rear rotation shaft 62 penetrates. The detection drive gear 76 is a partial gear having a gear portion 76a constituting an uneven tooth portion at a part in the circumferential direction, and has an approximately fan shape. The detection drive gear 76 is provided in a state in which the gear portion 76a is directed toward the intermediate rotation shaft 70 side in a side view. The angular range in which the gear portion 76a is formed is, for example, an angular range of 80 to 90 °.

The detection driven gear 77 is provided with: the intermediate rotation shaft 70 is integrally rotated with the intermediate rotation shaft 70 in a state where the intermediate rotation shaft 70 is penetrated and fixed to the intermediate rotation shaft 70. The detection driven gear 77 receives the transmission of the rotational force of the rear rotation shaft 62 from the detection drive gear 76. The detection driven gear 77 is a partial gear having a gear portion 77a constituting an uneven tooth portion in a part of the circumferential direction. The detection driven gear 77 is provided in a state in which the gear portion 77a is directed to the rear side in side view, and the gear portion 77a is engaged with the gear portion 76a of the detection drive gear 76, so that the detection driven gear 77 is engaged with the detection drive gear 76. The angular range in which the gear portion 77a is formed is, for example, an angular range of 150 to 170 °.

The cutting height detecting device 40 has a drive arm 80 as a drive member fixed to the rear rotation shaft 62 as a structure for transmitting the rotation of the rear rotation shaft 62 to the detection drive gear 76. The driving arm 80 includes: a tubular base 81, the rear rotation shaft 62 penetrating the base 81; and an arm 82 protruding from the base 81 toward the radial outside of the rear rotation shaft 62.

The drive arm 80 is configured such that the base 81 is engaged with the rear rotation shaft 62 in a spline fit manner, and is fastened and fixed to the rear rotation shaft 62 in a manner such that the base cannot rotate relative to the rear rotation shaft. That is, the drive arm 80 rotates integrally with the rear rotation shaft 62 about the 2 nd axis P2.

The arm 82 is a plate-like portion in the plate thickness direction in the axial direction of the rear rotation shaft 62, and protrudes obliquely rearward and upward from the base 81 with respect to the 2 nd axis P2. The arm 82 has: a distal tip shape that tapers from the base 81 side toward the distal end side from the outer diameter of the base 81 in side view. The arm 82 is provided in the middle of the tubular base 81 in the axial direction of the rear rotation shaft 62, and is adjacent to the left side of the detection drive gear 76. The detection drive gear 76 is mounted on a portion of the base 81 on the right side of the arm 82, and is rotatably supported by the base 81 so as to be rotatable relative to the rear rotation shaft 62.

The driving arm 80 has a detection pin 83 that abuts against the detection driving gear 76. The detection pin 83 is provided to protrude cylindrically from the substantially central portion of the arm 82 toward the right. The detection pin 83 is located radially inward of the rear rotation shaft 62 from the outer peripheral edge portion of the gear portion 76a with respect to the detection drive gear 76, and has a protruding length in the axial direction of the rear rotation shaft 62 that does not interfere with the detection drive gear 76. The detection pin 83 is provided as an abutment portion with respect to the detection drive gear 76 at the rear edge portion 76b of the gear portion 76 a.

In such a configuration, the detection pin 83 is the following 1 st transmission member input unit: the rotation of the rear rotation shaft 62 caused by the rearward rotation of the grounding body 42 is transmitted to the detection drive gear 76, and the detection drive gear 76 is rotated around the rear rotation shaft 62.

That is, as the grounding body 42 rotates rearward, the driving arm 80 rotates via the rear rotation shaft 62 so that the arm 82 moves forward, and the detection driving gear 76 is pressed from the rear by the detection pin 83 and rotates about the rear rotation shaft 62. The detection drive gear 76 rotates to rotate the intermediate rotation shaft 70 together with the detection driven gear 77 meshed with the detection drive gear 76, and the rotation of the intermediate rotation shaft 70 is detected by the detection sensor 43.

As described above, the cutting height detecting device 40 has a structure including the rear rotation shaft 62, the driving arm 80, the detection driving gear 76, the detection driven gear 77, and the intermediate rotation shaft 70 as a detection transmission mechanism for detecting the rearward rotation of the ground 42 by the detection sensor 43 in the sensor unit 45.

The apparatus main body 41 is configured to: the ground body 42 rotates around the front fixed shaft 61 in conjunction with the rotation of the ground body 42 in a state of being located further forward than the reference position. That is, for example, when the ground engaging body 42 is rotated toward the front side of the reference position by a pressing action from the rear as the ground sliding resistance in the case where the body of the combine harvester 1 is retracted, the device body 41 is rotated upward about the front side fixed shaft 61 in accordance with the relative rotation of the ground engaging body 42 with respect to the device body 41.

The cutting height detection device 40 includes a case rotation transmission mechanism as a mechanism for rotating the device main body 41 upward in response to forward rotation of the grounding body 42 from the reference position in the sensor unit 45.

The case rotation transmission mechanism will be described. The case rotation transmission mechanism includes a rear rotation shaft 62, a drive arm 80, a case rotation drive gear 86 as a 3 rd transmission member, a case rotation driven gear 87 as a 4 th transmission member, an intermediate rotation shaft 70, a fixing plate 57, and a front fixed shaft 61.

The case rotation drive gear 86 is rotatably supported by the rear rotation shaft 62 in a state where the rear rotation shaft 62 penetrates. The housing rotation drive gear 86 is adjacent to the left side of the arm 82 of the drive arm 80 in the axial direction of the rear rotation shaft 62. The case rotation drive gear 86 is mounted on a portion of the base 81 of the drive arm 80 on the left side of the arm 82, and is rotatably supported by the base 81 so as to be rotatable relative to the rear rotation shaft 62.

The case turning drive gear 86 is a partial gear as follows: most of the peripheral edge portion is a gear portion 86a constituting an uneven tooth portion, and a part of the peripheral edge portion is a notch-shaped recess 86b. The case turning drive gear 86 is provided in a state in which the recess 86b is directed upward. The recess 86b has a locking surface 86c on the rear side that forms a mountain-like corner portion along with the circular arc shape along which the gear portion 86a extends in side view. The angular range in which the concave portion 86b is formed is, for example, an angular range of 70 to 80 °.

The driven gear 87 for housing rotation is provided so that the intermediate rotation shaft 70 penetrates and is rotatably supported by the intermediate rotation shaft 70. The housing rotation driven gear 87 is positioned on the left side of the detection driven gear 77 on the intermediate rotation shaft 70. The housing rotation driven gear 87 receives the transmission of the rotational force of the rear rotation shaft 62 from the housing rotation driving gear 86. The driven gear 87 for housing rotation is a partial gear having a gear portion 87a constituting an uneven tooth portion in a part of the circumferential direction. The driven gear 87 for housing rotation is a long member having a longitudinal direction with respect to a predetermined radial direction of the intermediate rotation shaft 70, and has a gear portion 87a on one side in the longitudinal direction, and an arm portion 87b extending at an acute angle so as to form a top portion on the other side in the longitudinal direction.

The housing rotation driven gear 87 is provided such that the gear portion 87a is oriented toward the rear rotation shaft 62 in a side view, and the gear portion 87a is engaged with the gear portion 86a of the housing rotation drive gear 86 to engage the housing rotation driven gear 87 with the housing rotation drive gear 86. The angular range in which the gear portion 87a is formed is, for example, an angular range of 80 to 90 °.

The driven gear 87 for rotation of the housing has a support pin 88 abutting against the fixed plate 57. The support pin 88 is provided to protrude cylindrically from the distal end portion of the arm portion 87b toward the right side. The driven gear 87 for housing rotation has a protruding length that interferes with the fixed plate 57 such that the main body portion is located on the left side of the fixed plate 57 in the axial direction of the intermediate rotation shaft 70. The support pin 88 is configured to support the upper edge 57c of the arm 57a as an abutment portion against the fixing plate 57.

The cutting height detecting device 40 has a drive arm 80 fixed to the rear rotation shaft 62 as a structure for transmitting the rotation of the rear rotation shaft 62 to the housing rotation drive gear 86.

The drive arm 80 has a housing rotation pin 84 that abuts against a housing rotation drive gear 86. The case turning pin 84 is provided to protrude cylindrically from the substantially central portion of the arm 82 toward the left. The case rotation pin 84 and the detection pin 83 are coaxially positioned and provided to be substantially laterally symmetrical with respect to the detection pin 83.

The housing rotation pin 84 has a protruding length that interferes with the housing rotation drive gear 86 in the axial direction of the rear rotation shaft 62, and is located in a recess 86b of the housing rotation drive gear 86. The housing rotation pin 84 has an engagement surface 86c of the recess 86b as an abutting portion against the housing rotation drive gear 86.

In this configuration, the case rotation pin 84 is the following 3 rd transmission member input unit: the rotation of the rear rotation shaft 62 caused by the forward rotation of the grounding body 42 is transmitted to the housing rotation drive gear 86, and the housing rotation drive gear 86 is rotated about the rear rotation shaft 62.

That is, as the grounding body 42 rotates forward, the drive arm 80 rotates via the rear rotation shaft 62 so that the arm 82 moves rearward, and the housing rotation drive gear 86 is pressed from the front side by the housing rotation pin 84 and rotates about the rear rotation shaft 62. The housing rotation driving gear 86 rotates to rotate the housing rotation driven gear 87 engaged therewith.

The housing rotation driven gear 87 rotates to bring the support pin 88 into contact with the fixing plate 57, thereby applying a pressing action to the fixing plate 57. Since the fixing plate 57 is fixed to the front fixing shaft 61, the case 51 constituting the apparatus main body 41 rotates around the front fixing shaft 61 so that the rear side rises in reaction to the pressing action of the support pin 88. Here, the housing 51 is rotated upward against the urging force of the housing return spring 56. Thus, the fixing plate 57 functions as a rotation support portion as follows: the apparatus main body 41 is fixed to the front fixed shaft 61 and rotated about the front fixed shaft 61 by the rotation power of the housing rotation driven gear 87.

In the above configuration, the grounding body 42 is provided with: the rotation about the rear rotation shaft 62 is positioned at a predetermined reference position in a state where no external force acts. A structure for positioning the grounding body 42 will be described.

Regarding the rotation of the grounding body 42 about the rear rotation shaft 62, the grounding body return spring 90 is biased in the forward rotation direction by the detection drive gear 76 and the drive arm 80. The grounding body return spring 90 is a so-called torsion spring, and has protruding portions 90a, 90b on both end sides of the coil-like portion. The grounding body return spring 90 is located on the right side of the detection drive gear 76, and is provided in a state in which the rear rotation shaft 62 penetrates the coil-shaped portion via the bushing 91.

The grounding body return spring 90 causes one protruding portion 90a located on the right side of the coil-shaped portion to abut against the lower surface 52b of the right housing 52, and causes the other protruding portion 90b located on the left side of the coil-shaped portion to be locked to the detection drive gear 76. The other protruding portion 90b is locked to the detection drive gear 76 by bending the distal end portion to the left and abutting the front edge portion 76c of the gear portion 76a of the detection drive gear 76.

The grounding body return spring 90 applies a force to the detection drive gear 76 that rotates rightward in left-hand view based on a force in a direction separating the protruding portions 90a and 90b from each other, and applies a force to the drive arm 80 from the detection drive gear 76 that moves the arm 82 rearward by the detection pin 83. As a result, the grounding body 42 is biased in the forward rotation direction by the rear rotation shaft 62 to which the drive arm 80 is fixedly provided.

On the other hand, the forward rotation of the ground body 42 in the reference state is regulated by the housing rotation transmission mechanism described above by the action of the urging force of the housing return spring 56. The grounding body 42 is intended to rotate forward, and the housing rotation pin 84 of the drive arm 80 applies a pressing force from the support pin 88 to the fixing plate 57 via the housing rotation drive gear 86 and the housing rotation driven gear 87, the pressing force being a force against the urging force of the housing return spring 56 to press the housing 51 downward.

That is, the urging force to press down the housing 51 by the housing return spring 56 acts on the grounding body 42 via the housing rotation driven gear 87, the housing rotation driving gear 86, the driving arm 80, and the rear rotation shaft 62, thereby restricting the forward rotation of the grounding body 42 in the reference state. Accordingly, the forces (torques) of the case return spring 56 and the ground return spring 90 are set to position the ground 42 at the reference position.

With respect to the cutting height detecting device 40 having the above-described configuration, the grounding body 42 is provided with: in a state of being located further rearward than the reference position, the apparatus main body 41 in a state of stopping rotation about the front fixed shaft 61 rotates about the rear rotation shaft 62. That is, for example, when the combine 1 is advanced, the ground engaging body 42 is pressed from the front and rotated to the rear side of the reference position, and only the ground engaging body 42 rotates relative to the device body 41 about the rear rotation shaft 62 without rotating the device body 41 about the front fixed shaft 61.

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

On the other hand, with respect to the relative rotation of the grounding body 42 with respect to the apparatus main body 41, the forward rotation of the grounding body 42 from the reference position is accompanied by the upward rotation of the housing 51. That is, in the forward rotation of the grounding body 42 from the reference position, the entire apparatus body 41 is rotated upward around the front fixed shaft 61 in conjunction with the rotation of the grounding body 42.

Here, in the relative rotation of the grounding body 42 forward from the reference position with respect to the device main body 41, the drive arm 80 rotates so that the arm 82 moves rearward, and therefore the detection pin 83 does not act on the detection drive gear 76. Therefore, the intermediate rotation shaft 70 that pivotally supports the detection driven gear 77 that meshes with the detection drive gear 76 does not rotate, and the rotation of the intermediate rotation shaft 70 is not detected by the detection sensor 43.

As described above, the harvest height detection apparatus 40 is configured to: the rotation amount of the grounding body 42 is detected by the detection sensor 43 in a state where the grounding body 42 is rotated backward from the reference position with respect to the apparatus main body 41.

The combine harvester 1 detects the height (harvesting height) of the harvesting unit 5 based on the detection signal of the detection sensor 43 by using the harvesting height detection device 40 having the above-described configuration. As described above, the harvest height detection device 40 detects the rearward rotation of the ground engaging body 42, and therefore, mainly detects the harvest height when the body of the combine 1 advances.

In the harvesting height detecting device 40, the detecting sensor 43 detects the rotational position of the intermediate rotary shaft 70 about the 2 nd axis P2 corresponding to the rotational position of the ground contact body 42, thereby detecting the height of the seedling dividing plate 21 from the ground G1, that is, the harvesting height. The detection signal of the detection sensor 43 is transmitted from the signal line 43a to the control section. The control unit receives an input of a detection signal from the detection sensor 43, and based on the detection signal, operates the hydraulic cylinder 18 so that the harvest height calculated from the detection result is maintained at a set value, thereby adjusting the harvest height.

(support Structure of cutting height detection device)

The supporting structure of the cutting height detection device 40 according to the present embodiment will be described. The harvest height detection device 40 is supported by the unit support 44 rotatably about a front-rear axis with respect to the support structure of the grain dividing portion 50. That is, as shown in fig. 9 and 10, the harvest height detection apparatus 40 is supported rotatably about the axial line O1 along the front-rear direction by the seedling dividing portion 50 so as to swing laterally.

The structure of the seedling dividing portion 50 related to the support of the harvest height detector 40 will be described. The seedling dividing portion 50 includes: a left-end grain separating frame 34 provided at a lower portion of the harvesting portion 5; a seedling dividing plate 21 provided on the front side of the seedling dividing frame 34; and a supporting frame 100 fixed to the grain separating frame 34. Here, the seedling dividing plate 21 associated with the support of the harvest height detection apparatus 40 is a seedling dividing plate 21A located at the left end (see fig. 3).

The grain separating frame 34 has, from the rear side toward the front side: a rear inclined portion 101 which is a front low and rear high inclined portion; a middle inclined portion 102 that forms an obtuse corner together with the rear inclined portion 101 and is an inclined portion having a high front and a low rear; and a front inclined portion 103 which forms an acute angle-shaped corner together with the intermediate inclined portion 102 and is a front low and rear high inclined portion. The intermediate inclined portion 102 and the front inclined portion 103 are formed with a convex curved portion 104 as a corner portion on the upper side. The seedling dividing 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 distal end portion. The entire grain separating frame 34 has a bent shape formed in an approximately Z-shape in a side view.

As for the grain separating frame 34, as shown in fig. 5, the middle portion of the rear-side inclined portion 101 is positioned above the left end portion of the horizontal frame 31, and the rear-side inclined portion 101 is fixed to the horizontal frame 31 by means of the support member 105 fixedly provided on the left end portion of the horizontal frame 31. With respect to the seedling dividing frame 34, a supporting frame portion 106 that supports the lower portion of the seedling supporting device 22 at the left end is made to protrude toward the right side from a portion near the bent portion 104 of the intermediate inclined portion 102 (see fig. 4). The support stay 33 for supporting the left-end grain lifting device 22 is fixedly provided in the support frame 106.

The support frame 100 is a frame portion formed of a tubular member, has a predetermined bent shape or curved shape, and is provided below the seedling dividing frame 34 so as to extend in the front-rear direction in a plan view. In the present embodiment, the support frame 100 is formed of a pipe member having a diameter smaller than that of the grain separating frame 32.

The support frame 100 has, from the rear side toward the front side: a rear inclined portion 111 which is a front low and rear high inclined portion; a horizontal portion 112 that forms an obtuse angle-shaped corner portion together with the rear-side inclined portion 111 and is a horizontal portion; a front inclined portion 113 that forms an obtuse corner together with the horizontal portion 112 and is an inclined portion having a high front and a low rear; and a rising portion 114 rising obliquely rearward and upward so as to form an obtuse corner together with the front-side inclined portion 113.

The rear end portion of the rear inclined portion 111, which is the rear end portion of the support frame 100, is fixed to the front side of the lower portion of the middle inclined portion 102 of the grain dividing frame 34 by welding or the like. The rear inclined portion 111 has an inclination angle substantially vertically symmetrical to the rear inclined portion 101 of the seedling dividing frame 34 in a side view. A reinforcing plate 115 whose plate thickness direction is the left-right direction is erected between the two frames in a state of being fixed by welding or the like below the fixed portion of the rear inclined portion 111 with respect to the grain separating frame 34.

In addition, regarding the support frame 100, the horizontal portion 112 is located slightly above the lower end of the seedling dividing plate 21 in the up-down direction. The front inclined portion 113 has an inclination angle substantially parallel to the intermediate inclined portion 102 of the grain separating frame 34 in a side view. The rising portion 114 has an inclination angle substantially parallel to the front inclined portion 103 of the grain separating frame 34 in a side view, and is fixed to the front inclined portion 103 by welding or the like in a state of being along the rear side of the front inclined portion 103. The corner formed by the front inclined portion 113 and the rising portion 114 is located right behind the tip end portion of the seedling dividing frame 34.

With regard to the support frame 100, both front and rear sides are fixed to the division frame 34 by welding or the like, and constitute a closed frame portion formed in a polygonal shape in a side view together with the division frame 34. That is, the upwardly convex portion formed by the intermediate inclined portion 102 and the front inclined portion 103 of the grain separating frame 34 is vertically engaged with the support frame 100 having a convex shape on the side substantially in a side view, so that a frame portion having a substantially pentagonal shape in a side view is formed.

The seedling dividing plate 21 has: a seedling dividing plate body 121; and a rib portion 122 provided at the rear side of the seedling dividing plate body 121. The seedling dividing plate body 121 is a plate-like member having a convex front side in a plan sectional view, and has a front plate portion formed in a front view shape and a side portion formed in a curved shape from the periphery of the front plate portion to the rear side. The seedling-dividing plate body 121 has a sharp shape in which the width gradually narrows from the rear side toward the front side in a front view and a plan view. The seedling dividing plate body 121 has a curved shape with a front low and a rear high and a rear lower side as a convex side in a side view.

The rib 122 is a plate-like portion having a plate thickness in the left-right direction, and is provided at the left-right center of the dividing plate body 121 at the rear side of the front plate portion of the dividing plate body 121. The rib 122 is provided as a portion integral with the seedling dividing plate body 121 by fixing the plate-like member to the seedling dividing plate body 121 by welding or the like. The rib 122 is provided in a range from a position slightly above the center in the vertical direction to the lower end (tip) with respect to the seedling dividing plate body 121.

The rib portion 122 has a shape along a curved shape in a side view of the seedling-dividing plate body 121, and is provided so as to protrude rearward from the seedling-dividing plate body 121 so as to form an arrow shape together with the seedling-dividing plate body 121 in a plan sectional view. The structure in which the rib portions 122 are provided in the seedling-dividing plate body 121 has a bilaterally symmetrical shape.

In addition, the seedling dividing part 50 includes a foot (catch) 125 as a seedling dividing plate supporting member provided on the rear side of the seedling dividing plate 21. The legs 125 are mounted to the seedling dividing plate 21 and are fixed to the seedling dividing frame 34 to support the seedling dividing plate 21 to the seedling dividing frame 34.

The leg 125 is an elongated plate-like member, and is provided in a slant shape with a low front and a high rear so that its longitudinal direction is inclined along the low front and the high rear of the seedling dividing plate 21. The leg 125 has a length extending from a position substantially identical to the upper end of the rib 122 to a lower portion of the rib 122 in the vertical direction, and is attached to the rib 122 in a state where it mostly overlaps the rib 122 in a side view.

The leg 125 overlaps the rib 122 from the left side, and is fastened and fixed to the rib 122 by bolts 126 and nuts 127 at the lower end portion of the leg 125 and at the upper and lower 2 positions of the upper portion. The bolt 126 passes through the leg 125 and the rib 122 from the left side and is screwed into a nut 127 located on the right side.

The legs 125 are fixed to the distal end portions of the grain separating frame 34 by welding or the like. In detail, the leg 125 has an upper protruding portion 125a that is exposed rearward from the rib portion 122 in a side view on the upper portion, and the rear side of the upper protruding portion 125a is fixed to the front side of the distal end portion of the grain separating frame 34 by welding or the like.

The division frame 34 forms a fixed end portion of the receiving leg 125, that is, a lower end portion of the front inclined portion 103, by an end forming member 128 that is separate from a pipe member constituting a main body portion of the division frame 34. The end forming member 128 is a cylindrical member having a cylindrical reduced diameter portion on one side, and is fixed to a pipe member constituting a main body portion of the seedling dividing frame 34 by bolts 129 or the like in a state where the reduced diameter portion is inserted and fitted into the pipe member.

The tip forming member 128 has a tip portion formed in the grain separating frame 34 and having the same diameter as the pipe member constituting the main body portion, and has a tapered portion 128a with a tapered tip portion. The upper protruding portion 125a of the leg 125 has a bent shape at its rear edge portion that mimics the shape of the front side of the tip forming member 128 including the tapered portion 128a in a side view, and is fixed to the tip forming member 128 so as to be fitted into the tip forming member 128.

In this way, the leg 125 is fixed to the seedling-dividing frame 34 and supports the seedling-dividing plate 21 in front of the seedling-dividing frame 34. The seedling dividing plate 21 is provided so as to be able to adjust the installation angle (inclination angle) with respect to the leg 125.

Specifically, the leg 125 is fixed to the upper fixing portion of the rib 122 at 2 upper and lower positions by bolts 126, and the bolt hole 125b penetrating the bolt 126 through the leg 125 is a long hole having a longitudinal direction in which the front-high and rear-low inclination directions are set. The bolt hole 125c of the leg 125 at the lower fixing portion is a circular hole through which the bolt 126 passes. According to such a fixing structure of the leg 125, the seedling-dividing plate 21 can adjust the attachment angle (inclination angle) with respect to the leg 125 within the movable range of the bolt hole 125b as the long hole in the rotation direction about the fixing portion based on the lower bolt 126 as the fulcrum.

In the grain dividing section 50 having the above-described configuration, the harvesting height detecting device 40 is supported by the grain dividing section 50 so as to be pivotable about the axis in the front-rear direction with the front-rear sides serving as the axis supporting sections 130. That is, in the harvest height detecting device 40, as the supporting portion for the grain separating portion 50, a front shaft supporting portion 130A as a front shaft supporting portion 130 and a rear shaft supporting portion 130B as a rear shaft supporting portion 130 are provided, and are supported by the shaft supporting portion 130 so as to be rotatable about a front-rear axis O1 as a rotation axis. In this way, the front and rear side shaft support portions 130A and 130B that support the cutting height detection device 40 rotatably about the axis in the front-rear direction are provided in the front and rear sides of the cutting height detection device 40.

The front shaft support 130A is provided on the rear side of the seedling dividing plate 21, and the rear shaft support 130B is provided on the support frame 100. The front and rear shaft support portions 130 will be described.

The front shaft support 130A includes: a boss 132 as a front support portion provided at the rear side of the seedling dividing plate 21; and a front support shaft portion 131 provided at the front end portion of the unit support body 44 and supported by the boss 132. The front shaft support 130A has the following structure: the front support shaft portion 131 protruding forward from the unit support body 44 is supported by the boss 132 provided at the lower end portion of the leg 125. That is, in the present embodiment, the tip end portion side of the harvest height detection apparatus 40 is attached to the leg 125 via the boss 132.

The front support shaft portion 131 protrudes forward from the front surface portion 44b of the unit support body 44. The front support shaft 131 is provided by fixing a pin-shaped shaft body to the front surface portion 44b in a penetrating manner by welding or the like with the front-rear direction being the axial direction. The front support shaft 131 is a portion integral with the unit support body 44, and makes the shaft center coincide with the shaft axis O1.

As shown in fig. 17, the protruding portion 132 is a hollow cylindrical portion in which the shaft supporting space 132b is formed by a cylindrical inner peripheral surface 132a, and is a tapered portion 132c having a rear side opened and a front side tapered at its distal end. The boss 132 is provided by fixing a cylindrical member to the lower end portion of the leg 125.

The leg 125 has a recess 125d at its lower end portion, and the recess 125d is formed in a bent shape along a front upper side of the boss 132 including the tapered portion 132c in a side view. The cylindrical member constituting the boss 132 is fixedly provided to the leg 125 by welding or the like in a state where the front portion is fitted in the recess 125d of the leg 125. The boss 132 has an outer diameter larger than the plate thickness of the leg 125, so that the leg 125 is located at the center in the left-right direction.

The front support shaft portion 131 is rotatably supported by the boss portion 132 in a state where the front portion thereof is inserted into the shaft support space 132 b. The front support shaft portion 131 is interposed between the front support shaft portion 131 and an inner peripheral surface 132a of the boss portion 132, in order from the front side toward the rear side, with a cylindrical bushing 134, a washer 135, and an O-ring 136 as bearing members, as members for penetrating the front support shaft portion 131.

The front support shaft 131 is prevented from falling off the boss 132 by a stopper screw 137 and a lock nut 138 which are screwed from the outside of the boss 132 toward the inside in the radial direction. The lock nut 138 is fixed to the outer peripheral surface of the boss 132 by welding or the like. The stopper screw 137 is inserted into the lock nut 138, penetrates the peripheral wall of the boss 132, and is engaged with the front support shaft 131. The stopper screw 137 is engaged with the front support shaft portion 131 by its distal end portion being located in an outer peripheral groove 131a, and the outer peripheral groove 131a is formed by a partially reduced diameter portion at a portion on the front side of the bushing 134 of the front support shaft portion 131.

In this way, the front bearing shaft portion 130A supports the front bearing shaft portion 131 provided at the front portion of the unit support body 44 on the seedling dividing plate 21 via the leg 125 and the boss 132. Thus, the front shaft support 130A rotatably supports the front side of the harvest height detector 40 on the grain dividing portion 50 with the front-rear direction as a rotation axis.

The rear bearing 130B includes: a post 142 as a rear support portion provided to the support frame 100; and a rear support shaft portion 141 provided at a rear end portion of the unit support body 44 and supported by the stay 142. The rear bearing 130B has the following structure: the rear support shaft 141 protruding rearward from the unit support body 44 is supported by a stay 142 provided to the support frame 100 via a support plate 143. That is, in the present embodiment, the rear end portion side of the harvest height detector 40 is attached to the support frame 100 via the support posts 142 and the support plates 143.

The rear support shaft portion 141 protrudes rearward from the rear surface portion 44d of the unit support body 44. The rear support shaft portion 141 is provided by penetrating and fixing a pin-shaped shaft body to the rear surface portion 44d by welding or the like with the front-rear direction being the axial direction. The rear support shaft portion 141 is a portion integral with the unit support body 44, and makes the shaft center coincide with the shaft axis O1. That is, the rear support shaft portion 141 and the front support shaft portion 131 are disposed on the same axis.

The support plate 143 is a plate-like member having an approximately right triangle shape. The support plate 143 is provided on the right side of the right triangle outer shape with respect to the support frame 100 as the front side and fixedly provided on the lower left side of the front side inclined portion 113 by welding or the like so that the hypotenuse portion follows the inclination of the front side inclined portion 113.

The support column 142 is formed by bending an elongated rectangular plate-like member into an approximately L-shape, and has a fixed face 142a as a long face and a support face 142b as a short face as faces constituting corner portions of a right angle shape. The support column 142 is such that the fixing surface 142a overlaps the left side of the support plate 143 in the longitudinal direction, and is fixed to the support plate 143 at 2 front and rear positions by a nut portion 146 or the like that receives the screw insertion of the bolt 145 and the bolt 145 penetrating the fixing surface 142a and the support plate 143.

The support column 142 is formed such that a support surface portion 142b bent from the front side of the fixed surface portion 142a toward the right side is parallel to the rear surface portion 44d of the unit support body 44 and is adjacent to and opposite to the rear side of the rear surface portion 44 d. The support surface portion 142b has a support hole 142c through which the rear support shaft portion 141 passes. The stay 142 penetrates the rear support shaft portion 141 with play with respect to the support hole 142c, and rotatably supports the rear support shaft portion 141.

In this way, the rear bearing shaft portion 130B supports the rear support shaft portion 141 provided at the rear of the unit support body 44 by the support plate 143 and the stay 142 to the support frame 100. Thus, the rear bearing 130B rotatably supports the rear side of the harvest height detector 40 on the grain dividing portion 50 coaxially with the front bearing 130A about the longitudinal axis.

As described above, the harvest height detection device 40 supports the unit support body 44 rotatably about the longitudinal axis O1 in the grain splitting section 50, thereby supporting the sensor unit 45 supported by the unit support body 44 so as to be swingable laterally. In such a support structure, the unit support body 44 has, at the front end portion and the rear end portion, a front support shaft portion 131 and a rear support shaft portion 141 as support shaft portions supported by the front and rear shaft support portions 130, respectively.

The rotation of the cutting height detecting device 40 about the front-rear axis is elastically positioned by a return spring 147 provided in the front bearing 130A so as to be positioned at a predetermined neutral position. The return spring 147 is a so-called torsion spring, and has linear protruding portions 147a, 147b on both end sides of the coil-like portion. The return spring 147 is provided such that a coil-shaped portion thereof penetrates the enlarged-diameter base portion 131b of the front support shaft portion 131, and such that the protruding portions 147a, 147b at both ends protrude upward. Further, the base 131b is a portion of the front support shaft 131 exposed rearward from the boss 132, and is located between the boss 132 and the front surface portion 44b of the unit support 44.

On the other hand, the unit support body 44 is provided with a locking pin 148 protruding forward from the front surface portion 44 b. The locking pin 148 protrudes forward from a semicircular protruding portion 44g provided on the upper edge portion of the front surface portion 44b, and is located above the front support shaft portion 131.

The return springs 147 have the protruding portions 147a, 147b located on the left and right sides of the lock pin 148, and the lock pin 148 is held by the protruding portions 147a, 147b from the left and right sides by elastic force. The return spring 147 has the protruding portions 147a and 147b located on the left and right sides of the lower portion of the leg 125 above the lock pin 148, and the leg 125 is held by the protruding portions 147a and 147b with elastic force.

According to this configuration, when an external force of a predetermined magnitude or more is applied to the cutting height detecting device 40 so as to rotate the cutting height detecting device 40 about the axis O1, the cutting height detecting device 40 rotates against the elastic force of the return spring 147 by pressing one of the protruding portions 147a, 147b by the locking pin 148 according to the rotation direction. When the external force is removed, the cutting height detection device 40 is returned to the neutral position by the elastic force of the return spring 147.

Guide bars 124 are provided on both left and right sides of the seedling dividing plate 21 from the lower portion of the rib 122. The 2 guide bars 124 extend rearward from the rib portion 122 so that the distance between them gradually increases from the front side toward the rear side in plan view. The 2 guide bars 124 function as the following guides: for example, when the combine 1 advances, inclusions such as weeds approaching the harvesting height detector 40 are guided to the left and right sides and are retracted rearward.

In the combine 1 according to the present embodiment, the front bearing 130A is located forward of the grain separating frame 34, and at least a part of the device body 41 is located forward of the front end of the grain separating frame 34. Specifically, the following is described.

The rear end portion of the front shaft support portion 130A is a base end portion of a front support shaft portion 131 protruding forward from the front surface portion 44b of the unit support body 44. On the other hand, the front end portion of the grain separating frame 34 is a tapered portion 128a of the end forming member 128, and the tapered portion 128a is located at a substantially central portion of the unit support 44 in the front-rear direction. The position of the tapered portion 128a in the front-rear direction is substantially the same as the rear end portion of the apparatus main body 41. In this way, the front bearing 130A is located further forward than the grain separating frame 34.

In addition, the substantially front half of the unit support body 44 is positioned on the front side of the tapered portion 128a, which is the front end portion of the grain dividing frame 34, in the front-rear direction. The substantially entire device body 41 of the sensor unit 45 supported by the unit support 44 is located within a range of substantially the front half of the unit support 44 in the front-rear direction. As described above, in the present embodiment, the substantially entire front-rear direction of the apparatus main body 41 is positioned forward of the front end of the grain separating frame 34.

In the present embodiment, the harvesting height detecting device 40 is provided in the following arrangement with respect to the seedling dividing portion 50. With respect to the seedling dividing portion 50, the support frame 100 has a front side inclined portion 113 as an inclined frame portion inclined to be high in front and low in rear behind the leg 125. That is, the front inclined portion 113 is a frame portion inclined from the rear side of the leg 125 to the front side to the rear side. The leg 125 and the front inclined portion 113 are formed in a mountain shape having a convex upper side in a side view.

As shown in fig. 5 and 7, in a side view, the support legs 125 inclined in a front-low-rear-high manner and the front inclined portions 113 of the support frame 100 inclined in a front-high-rear-low manner constitute a substantially mountain-shaped portion having a top portion near the distal end portion of the grain dividing frame 34. That is, the upper end portions of the legs 125 inclined in a front-low-rear high manner and the upper end portions of the front-side inclined portions 113 inclined in a front-high-rear low manner are located in the vicinity of each other with the tip portions of the grain separating frame 34 interposed therebetween.

The harvest height detection device 40 is disposed between the leg 125 and the front inclined portion 113 of the support frame 100. That is, in a side view, a space portion sandwiched between the leg 125 and the front inclined portion 113 in the front-rear direction is formed below the leg 125 and the front inclined portion 113, and the cutting height detecting device 40 is disposed in the space.

The cut-height detecting device 40 is provided in the form of: the front side of the unit support body 44 is supported by the lower end portion of the leg 125 via the boss 132 below the leg 125 and the front inclined portion 113, and the rear side of the unit support body 44 is supported by the lower portion of the front inclined portion 113 via the stay 142 or the like, so as to be erected in the front-rear direction. According to such a support structure, the unit support body 44 extending in the front-rear direction, the leg 125 inclined to be low in front-rear direction from the vicinity of the front end portion of the unit support body 44, and the front-side inclined portion 113 inclined to be low in front-rear direction from the vicinity of the rear end portion of the unit support body 44 constitute a frame structure portion of an approximately isosceles triangle along the side of the unit support body 44 as the base side in side view.

In the present embodiment, the following structure is adopted as the support structure of the device body 41 of the cutting height detection device 40. The unit support body 44 has a portion overlapping at least a part of the apparatus main body 41 when viewed in the axial direction in the front-rear direction at the front end portion and the rear end portion, respectively.

The unit support body 44 has a front surface portion 44b at a front end portion and a rear surface portion 44d at a rear end portion. The front surface portion 44b has substantially the same vertical width as the front portion of the left side surface portion 44a of the unit support body 44, and the rear surface portion 44d has substantially the same vertical width as the rear portion of the left side surface portion 44 a. As described above, the housing 51 constituting the outer shape of the apparatus main body 41 has a size that is exposed up and down with respect to the left side surface portion 44a in side view (see fig. 9).

As shown in fig. 10, the unit support body 44 is positioned such that the entire housing 51 is located within a range of the dimension D1 of the front surface portion 44b in the left-right direction. In addition, the unit support body 44 is located so that a majority of the left side (lower side in fig. 10) of the housing 51 is located within a range of the dimension D2 of the rear surface portion 44D in the left-right direction.

According to the above configuration, the unit support body 44 covers the housing 51 from the front side in a state where most of the front surface portion 44b overlaps the housing 51 in a front view. On the other hand, the unit support body 44 covers the housing 51 from the rear side in a state in which substantially the entire rear surface portion 44d overlaps the housing 51 in a rear view. The unit support body 44 covers the middle portion of the housing 51 in the up-down direction from the left side by the left side surface portion 44a over the entire front-back direction of the housing 51.

(action of cutting height detection device)

The operation of the cutting height detection device 40 according to the present embodiment will be described.

First, the operation of the harvesting height detection device 40 during normal operation of the combine harvester 1, that is, during operation in the forward direction of the machine body will be described with reference to fig. 13. In normal operation, the detection transmission mechanism of the cutting height detection device 40 functions to detect the cutting height. That is, the harvest height is controlled based on the detection value of the harvest height by the harvest height detection device 40 so that the harvest height is maintained at the set value. The cutting height is detected in a state where the rotational position of the grounding body 42 with respect to the device main body 41 is set to the rear side of the reference position.

When the body is advanced (hereinafter, simply referred to as "advanced"), the ground contact body 42, which slides in a state where the tip is brought into contact with the ground G1, is rotated rearward about the rear rotation shaft 62 from the reference position with respect to the housing 51 of the apparatus main body 41 due to the ground contact sliding resistance (refer to an arrow E1). The grounding body 42 rotates integrally with the rear rotation shaft 62 about the 2 nd axis P2, and thereby the driving arm 80 fixedly provided to the rear rotation shaft 62 rotates so that the arm 82 moves forward (see arrow E2).

The drive arm 80 rotates forward, and the detection drive gear 76 is pressed from the rear side by the detection pin 83 of the drive arm 80, whereby the detection drive gear 76 is rotated relative to the rear rotation shaft 62 about the 2 nd axis P2 to the left in a left-hand view (see arrow E3). As the detection drive gear 76 rotates, the detection driven gear 77 engaged with the detection drive gear 76 rotates rightward in left-hand view about the 3 rd axis P3 integrally with the intermediate rotation shaft 70 (see arrow E4). The rotation of the intermediate rotation shaft 70 is detected by the detection sensor 43, and the cutting height is detected based on the rotation amount of the intermediate rotation shaft 70.

Next, the operation of the harvesting height detection device 40 when the body of the combine harvester 1 is retracted (hereinafter referred to as "retracted") will be described with reference to fig. 11. In the backward movement, the housing rotation transmission mechanism of the cutting height detection device 40 is operated to rotate the device main body 41 upward about the front fixed shaft 61. The device body 41 is rotated upward with the rotational position of the grounding body 42 relative to the device body 41 being set forward of the reference position.

When retreating, the ground contact body 42, which has its tip in contact with the ground G1, is rotated forward (see arrow F1) from the reference position about the rear rotation shaft 62 with respect to the housing 51 of the apparatus main body 41 due to the ground contact sliding resistance. The grounding body 42 rotates integrally with the rear rotation shaft 62 about the 2 nd axis P2, and thereby the driving arm 80 fixedly provided to the rear rotation shaft 62 rotates so that the arm 82 moves rearward (see arrow F2).

The drive arm 80 rotates backward, and the housing rotation drive gear 86 is pressed from the front side by the housing rotation pin 84 of the drive arm 80, whereby the housing rotation drive gear 86 is rotated relative to the rear rotation shaft 62 about the 2 nd axis P2 to the right in a left-hand view (see arrow F3). As the case rotation driving gear 86 rotates, the case rotation driven gear 87 engaged with the case rotation driving gear 86 rotates relative to the intermediate rotation shaft 70 in a direction in which the arm 87b descends about the 3 rd axis P3 (see arrow F4).

As the driven gear 87 for housing rotation rotates, the support pin 88 fixed to the arm 87b presses the support arm 57a acting on the fixing plate 57 from above to transmit a load (see arrow F5). Thereby, the apparatus main body 41 is rotated integrally with the ground body 42 and the detection sensor 43 with the front fixed shaft 61 as a center and with the rear side raised (see arrow F6). In this way, the case rotation transmission mechanism functions as a avoidance structure that causes the device main body 41 to rotate upward and avoid when the vehicle is retreated.

Next, the behavior of the cutting height detection device 40 at the time of the backward movement will be described in detail with reference to fig. 18. In the backward movement, the cutting height detecting device 40 is in the reference state in a state where the grounding body 42 is not grounded, and the grounding body 42 is positioned at the reference position (see fig. 18A).

At the time of the backward movement (see arrow T1), the harvesting unit 5 is lowered from the state where the ground contact body 42 is not grounded, and as shown in fig. 18A, the height of the seedling dividing plate, which is the height of the lower end of the seedling dividing plate 21 from the ground surface G1, is lower than the predetermined height H0 at which the ground contact body 42 is grounded, so that the ground contact body 42 is rotated forward about the 2 nd axis P2 by receiving the ground contact sliding resistance from the ground surface G1. The height H0 is, for example, about 60mm. In this state, the 2 nd axis P2 is located slightly lower than the 1 st axis P1. The height of the dividing plate is one of the indices defining the cutting height.

Fig. 18B shows a state in which the seedling-dividing plate height becomes a height H1 slightly lower than the height H0. In this state, the grounding body 42 is slightly rotated forward relative to the device body 41 (see arrow J1), and in conjunction with this, the device body 41 is rotated in a direction slightly away from the reference state (see arrow K1). In this state, for example, in the case where the height H1 is about 50mm, the rotation angle α1 of the ground body 42 with respect to the reference position is about 30 °. The rotation angle of the device body 41 with respect to the reference state is about 10 °, and the 2 nd axis P2 is located at substantially the same height as the 1 st axis P1.

Fig. 18C shows a state in which the seedling-dividing plate height becomes a height H2 lower than the height H1. In this state, the grounding body 42 is further rotated forward relative to the device body 41 (see arrow J2), and in conjunction with this, the device body 41 is further rotated in the upward direction (see arrow K2). In this state, for example, in the case where the height H2 is about 28mm, the rotation angle α2 of the ground body 42 with respect to the reference position is about 60 °. The rotation angle of the device body 41 with respect to the reference state is about 25 °, and the 2 nd axis P2 is located higher than the 1 st axis P1.

Fig. 18D shows a state where the seedling dividing plate height is 0, that is, a state where the lower end of the seedling dividing plate 21 is located on the ground G1. In this state, the grounding body 42 is further rotated forward relative to the device body 41 (see arrow J3), and the device body 41 is further rotated in the upward direction (see arrow K3). In this state, the rotation angle α3 of the ground body 42 with respect to the reference position is about 90 °. The rotation angle of the apparatus main body 41 is about 37.5 °, and the 2 nd axis P2 is located higher than the 1 st axis P1.

Next, the behavior of the harvest height detection device 40 when the seedling plate height is advanced while maintaining 0 from the state in which the device body 41 is retracted by being rotated upward will be described with reference to fig. 19. Fig. 19A shows a state in which the height of the seedling-dividing plate is 0 at the time of backward movement, that is, the same state as fig. 18D.

When the machine body starts to advance while the height of the seedling-dividing plate is kept at 0 from the state shown in fig. 19A (see arrow T2), the grounding body 42 rotates backward relative to the device body 41 due to the grounding sliding resistance (see arrow L1) and the device body 41 also rotates upward (see arrow M1) as shown in fig. 19B. The state shown in fig. 19B is a state in which the apparatus main body 41 is turned to the uppermost state, and in this state, the turning angle α4 of the grounding body 42 with respect to the reference position is about 60 °. That is, the rotation angle of the ground body 42 with respect to the reference position is about 60 °, and the amount of upward pushing of the ground G1 against the apparatus main body 41 is maximum.

Further, the rotation of the device body 41 further upward than the position where the device body 41 rotates upward corresponding to the position where the grounding body 42 rotates forward relative to the device body 41 by the transmission mechanism for housing rotation is: against the rotation of the force of the housing return spring 56. Further, the vicinity of the concave corner 125e of the lower side of the upper protruding portion 125a of the leg 125 serves as a stopper with respect to the apparatus body 41 for the upward rotation of the apparatus body 41.

When the body is further advanced from the state shown in fig. 19B, the grounding body 42 is pushed and further rotated backward (see arrow L2) as shown in fig. 19C, while the device body 41 is rotated downward (see arrow M2) according to the position of the distal end of the grounding body 42. Fig. 19C shows a state in which the rotation angle α5 of the ground body 42 with respect to the reference position is 30 °. In this state, the rotation angle of the apparatus main body 41 with respect to the reference state is about 38 °.

When the body is further advanced from the state shown in fig. 19C, the device body 41 is further rotated downward (see arrow M3) as shown in fig. 19D, and the grounding body 42 is returned to the reference position (see arrow L3). The return of the ground contact body 42 to the reference position during the forward movement is performed mainly by the reaction force (ground contact sliding resistance) from the ground surface G1, and is not performed by the action of the mechanism in the device body 41.

Next, the operation of the harvesting height detection device 40 when the harvesting unit 5 is lowered in the stopped state of the machine body in which the combine 1 is stopped will be described with reference to fig. 20.

Fig. 20A shows a state in which the grounding body 42 is not grounded when the machine body is stopped. In this state, the cutting height detecting device 40 is in the reference state, and the grounding body 42 is located at the reference position.

By lowering the harvesting unit 5 from the state shown in fig. 20A so that the height of the seedling-dividing plate becomes 0 (see arrow U1), the harvesting height detecting device 40 grounds the ground body 42 as shown in fig. 20B, and thereby rotates the device body 41 about the 1 st axis P1 based on the reaction force (ground reaction force) from the ground G1 (see arrow N1). Here, the cutting height detecting device 40 rotates the device body 41 while maintaining the reference position of the grounding body 42 without rotating the grounding body 42 relative to the device body 41. The rotation angle β1 of the apparatus main body 41 with respect to the reference state is, for example, about 27 °.

Next, the behavior of the cutting height detecting device 40 when the cutting height detecting device 40 receives a lateral external force will be described with reference to fig. 21. Here, the case where the cutting height detecting device 40 receives an external force from the lateral direction at the grounding body 42 protruding from below the unit support body 44 will be described. For example, when the body is turned with the ground contact body 42 grounded, a lateral external force acts on the cutting height detection device 40.

When a lateral external force acts on the cutting height detection device 40, the cutting height detection device 40 is rotated around the front-rear axis O1 by the front-rear shaft support 130 to avoid the cutting height. Fig. 21A shows a state in which the cutting height detection device 40 is positioned at a neutral position with respect to the axis O1 without applying a lateral external force to the cutting height detection device 40.

When an external force acts on the cutting height detecting device 40 from the left side (right side in fig. 21A) from the state shown in fig. 21A, the cutting height detecting device 40 rotates so as to move the ground contact body 42 to the right side about the axis line O1 as shown in fig. 21B (see arrow Q1). Fig. 21B shows a state in which the harvest height detection apparatus 40 is rotated from the neutral position to the left side by an angle γ1 around the axis O1. In the example shown in fig. 21B, the angle γ1 is about 45 °.

On the other hand, when an external force acts on the cut height detection device 40 from the right side (left side in fig. 21A) from the state shown in fig. 21A, the cut height detection device 40 rotates so as to move the ground contact body 42 to the left side about the axis O1 as shown in fig. 21C (see arrow Q2). Fig. 21C shows a state in which the harvest height detection apparatus 40 is rotated from the neutral position to the right side by an angle γ2 about the axis O1. In the example shown in fig. 21C, the angle γ2 is about 70 °.

When the lateral external force is removed from the state shown in fig. 21B and 21C, the cut height detection device 40 is returned to the predetermined neutral position by the biasing structure of the return spring 147 and the locking pin 148. Such a lateral rotation (left-right rotation) about the axis O1 in the front-rear direction is performed as an independent operation of the rotation of the ground contact body 42 and the device main body 41 caused by the application of the force in the front-rear direction to the ground contact body 42. That is, the left-right rotation of the cutting height detecting device 40 about the axis O1 and the rotation of the device body 41 about the 1 st axis P1 and the rotation of the grounding body 42 about the 2 nd axis P2 can be performed simultaneously in accordance with the external force acting on the cutting height detecting device 40.

According to the combine harvester 1 of the present embodiment having the above-described configuration, in the configuration for detecting the harvesting height of the harvesting unit 5, it is possible to eliminate a problem caused by the force acting on the ground 42 from the ground G1 and the stub, and to detect the harvesting height with high accuracy.

According to the cutting height detection device 40 of the present embodiment, the cutting height is detected by the ground contact body 42 rotating backward during normal running, so that it is possible to make it difficult to always rotate the device main body 41 up and down. This makes it possible to make the device body 41 less likely to be damaged. In addition, the device body 41 is less likely to rotate up and down, and clogging between the device body 41 and the seedling dividing plate 21, the legs 125, and the like can be suppressed. This can suppress excessive force applied to the ground body 42 from the ground G1 and the stub, and can suppress, for example, a failure such as breakage of the ground body 42.

As described above, in the cutting height detection device 40 according to the present embodiment, for example, the cutting height can be detected with high accuracy by detecting the cutting height by the detection sensor 43 that detects the rotation of the intermediate rotation shaft 70 based on the rotation of the ground contact body 42 without restricting the rearward rotation of the ground contact body 42 about the rear rotation shaft 62 during the forward movement. This can improve the accuracy of controlling the cutting height.

The cutting height detection device 40 according to the present embodiment is configured to: the relative rotation of the ground engaging body 42 with respect to the apparatus main body 41 is detected by the detection sensor 43 with respect to the amount of rotation of the ground engaging body 42 rearward from the reference position.

According to this configuration, the ground contact body 42 is rotated rearward by the ground contact sliding resistance during the forward movement, and the cutting height can be detected by the detection sensor 43. This can suppress the excessive force applied to the ground body 42 from the ground G1 and the stub, and can suppress, for example, a failure such as breakage of the ground body 42.

In the cutting height detection device 40 according to the present embodiment, the ground contact body 42 rotates about the rear rotation shaft 62 with respect to the device body 41 in a state in which rotation about the front fixed shaft 61 is stopped in a state in which the ground contact body is located further rearward than the reference position. That is, the harvest height detection device 40 is configured to: in a state where the grounding body 42 is located further rearward than the reference position, the apparatus main body 41 is not rotated but only the grounding body 42 is rotated.

With this configuration, for example, the position of the device body 41 can be held during the forward movement, so that it is possible to detect the cutting height detected by the rotation of the ground contact body 42 with high accuracy while suppressing a defect such as breakage of the ground contact body 42.

The cutting height detection device 40 according to the present embodiment is configured to: in a state where the grounding body 42 is located forward of the reference position, the apparatus main body 41 rotates around the front fixed shaft 61 in conjunction with the rotation of the grounding body 42.

According to this configuration, for example, the device body 41 can be forcibly retracted upward by the grounding body 42 during the retraction, so that an excessive load that may damage the device body 41 and the grounding body 42 can be suppressed. That is, during the backward movement, the grounding body 42 receives an action in the forward rotation direction due to the grounding sliding resistance, but as the grounding body 42 rotates forward from the reference position, the device body 41 rotates upward, so that the grounding body 42 can be prevented from becoming an overload state, and breakage of the device body 41, the grounding body 42, and the like can be suppressed.

The cutting height detection device 40 according to the present embodiment includes, in a detection transmission mechanism for detecting rearward rotation of the ground 42 by the detection sensor 43: a detection drive gear 76 rotatably supported by the rear rotation shaft 62 integrally rotated with the ground body 42; and a detection driven gear 77 fixed to the intermediate rotation shaft 70 as an input shaft to the detection sensor 43. The rotation of the rear rotation shaft 62 is transmitted to the intermediate rotation shaft 70 via the gear.

With this configuration, the rotation of the ground body 42 can be reliably input to the detection sensor 43. This allows the height of the ground contact body 42 to be accurately detected.

In the cutting height detection device 40 according to the present embodiment, the detection transmission mechanism includes a drive arm 80, and the drive arm 80 includes a detection pin 83 for rotating the detection drive gear 76.

With this configuration, the detection transmission mechanism can be compactly configured, and the rotation of the ground body 42 can be reliably input to the detection sensor 43, so that the cutting height can be detected with high accuracy.

In addition, the cutting height detection device 40 according to the present embodiment includes, in a case rotation transmission mechanism that rotates an apparatus main body 41 upward in conjunction with forward rotation of a ground contact body 42: a case rotation drive gear 86 rotatably supported by the rear rotation shaft 62; a driven gear 87 for housing rotation rotatably supported by the intermediate rotation shaft 70; and a fixing plate 57 fixed to the front fixing shaft 61.

According to this configuration, the case rotation transmission mechanism can be realized with a simple configuration, and the device body 41 can be retracted upward when the vehicle is retracted, so that defects such as breakage of the device body 41 can be suppressed.

In the cutting height detecting device 40 according to the present embodiment, the case rotation transmitting mechanism includes a case rotation pin 84 for rotating the case rotation driving gear 86 in the driving arm 80.

With this configuration, the transmission mechanism for housing rotation can be compactly configured, and the rotation of the grounding member 42 can be reliably input to the drive gear 86 for housing rotation, so that the device main body 41 can be retracted upward.

The harvesting height detection device 40 according to the present embodiment includes: a position adjustment mechanism for adjusting the position of the front fixed shaft 61 with respect to the unit support 44 by the operation of the stopper screw 59.

According to this configuration, in the positioning structure for positioning the device main body 41 with respect to the unit support body 44 by the housing return spring 56 and the locking projection 53b, these components can be assembled so as to eliminate rattling between the detection pin 83 and the housing rotation pin 84 of the drive arm 80 and the detection drive gear 76 and the housing rotation drive gear 86, respectively, depending on the meshing positions of the gears in the device main body 41. This makes it possible to detect the cutting height with high accuracy in the detection of the cutting height by the detection sensor 43.

Further, according to the combine harvester 1 of the present embodiment, the structure for detecting the harvest height of the harvest device 5 can be stably supported, and defects such as breakage of the support device due to external force can be suppressed, so that the harvest height can be detected with high accuracy.

In the sensor unit disclosed in patent document 1, a bracket that receives the attachment of the unit main body via a 1 st rotation shaft is rotatably attached to a forward-inclined rotation shaft that is attached to a cover support member of a seedling separating body. That is, the unit main body is supported by the cover support member of the seedling separating body together with the bracket so as to be rotatable about the axis of the forward-inclined rotation shaft. According to this structure, the following problems occur.

In the supporting structure of the sensor unit disclosed in patent document 1, the sensor unit is supported by a cantilever by supporting the sensor unit to a seedling dividing body located on the front side thereof via a bracket or the like. Therefore, it is difficult to obtain a sufficient supporting strength at the supporting portion of the sensor unit, and if the unit main body is externally biased, for example, there is a possibility that a failure such as breakage may occur at the supporting portion of the sensor unit.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a combine harvester capable of stably supporting a structure for detecting a harvest height of a harvest section, capable of suppressing defects such as breakage of a supporting section due to external force application, and capable of detecting the harvest height with high accuracy.

Accordingly, the harvesting height detecting apparatus 40 according to the present embodiment is supported by the seedling dividing portion 50 so as to be pivotable about the axis in the front-rear direction with the front-rear sides serving as the axis supporting portions 130.

According to this configuration, for example, when a lateral external force acts on the cutting height detecting device 40 when the body is turned with the ground contact body 42 grounded, the cutting height detecting device 40 can be rotated around the axis O1 to avoid the influence of the external force, and the influence of the external force can be reduced. As a result, the harvesting height detecting device 40 can be supported by the seedling dividing portion 50 in a stable state, and defects such as breakage of the harvesting height detecting device 40 can be suppressed mainly for the lateral input. In addition, the cutting height detecting device 40 is supported on both front and rear sides, so that sufficient supporting strength can be easily obtained.

In the present embodiment, the seedling dividing unit 50 includes: a seedling dividing frame 34 for supporting the seedling dividing plate 21 by means of the legs 125; and a supporting frame 100 fixed to the grain separating frame 34. Further, of the front and rear shaft support portions 130 of the harvest height detector 40, a front shaft support portion 130A is provided on the rear side of the seedling dividing plate 21, and a rear shaft support portion 130B is provided on the support frame 100.

According to this structure, the harvesting height detecting device 40 can be stably supported, and the front side of the harvesting height detecting device 40 can be protected by the seedling dividing plate 21. This ensures stable operation of the cutting height detection device 40, and can detect the cutting height with high accuracy.

The harvest height detection device 40 according to the present embodiment includes a unit support 44, and the front shaft support 130A includes: a boss 132; and a front support shaft portion 131 provided at the front end portion of the unit support body 44 and supported by the boss 132, the rear support shaft portion 130B having: a support column 142 provided to the support frame 100; and a rear support shaft portion 141 provided at a rear end portion of the unit support body 44 and supported by the stay 142.

According to this configuration, the front-rear shaft support portion 130 can be provided with a simple configuration, and the cutting height detection device 40 can be stably supported so as to be rotatable about the front-rear shaft. Accordingly, it is possible to suppress the breakage of the cutting height detecting device 40 or other defects with respect to the input to the cutting height detecting device 40 in the lateral direction.

In the present embodiment, the front bearing 130A is located forward of the grain separating frame 34, and substantially the entire apparatus body 41 is located forward of the front end of the grain separating frame 34.

With this configuration, the sensor unit 45 of the cutting height detection device 40 can be disposed in front, and therefore, the accuracy of detecting the cutting height can be improved. That is, since the height of the cutting is detected as the height of the seedling-dividing plate 21 based on the rotational movement of the grounding body 42 of the sensor unit 45, by bringing the sensor unit 45 close to the front seedling-dividing plate 21, the movement of the grounding body 42 can be reflected as the height position of the seedling-dividing plate 21 with higher accuracy.

In the present embodiment, the seedling dividing unit 50 includes a leg 125 for supporting the seedling dividing plate 21 to the seedling dividing frame 34, and the front shaft supporting portion 130A is provided to the leg 125.

According to this structure, the supporting position by the front shaft supporting portion 130A can be maintained regardless of the installation angle of the seedling dividing plate 21 with respect to the leg 125. This enables the cutting height detection device 40 to be stably supported.

In the support structure of the cutting height detection device 40 according to the present embodiment, the cutting height detection device 40 is disposed between the leg 125 forming a mountain shape and the front inclined portion 113 of the support frame 100 in a side view.

According to this configuration, the cutting height detecting device 40 can be covered from the front and rear by the leg 125 and the front inclined portion 113 of the support frame 100, so that the cut stalks, inclusions, and the like can be prevented from coming into contact with the sensor unit 45 of the cutting height detecting device 40. This ensures stable operation of the cutting height detection device 40, and can maintain good detection accuracy.

In the present embodiment, the unit support body 44 has a front surface portion 44b and a rear surface portion 44d, which are portions overlapping the device body 41 when viewed in the axial direction of the front-rear axis O1, at the front end portion and the rear end portion, respectively.

According to this structure, the device body 41 can be covered from the front and rear by the front surface portion 44b and the rear surface portion 44d of the unit support 44, so that the cut stalks, inclusions, and the like can be prevented from coming into contact with the device body 41. This ensures stable operation of the cutting height detection device 40, and can maintain good detection accuracy.

[ embodiment 2 ]

Embodiment 2 of the cutting height detecting device 40 and its supporting structure will be described with reference to fig. 22 to 30. In embodiment 2, the same reference numerals as those in embodiment 1 are given to the same or similar structures as those in embodiment 1, and the description thereof is omitted as appropriate. The cutting height detection device 40 according to the present embodiment is different from embodiment 1 mainly in the internal mechanism of the device body 41 and the support structure of the cutting height detection device 40.

(Structure of cutting height detection device)

The cutting height detection device 40 according to the present embodiment is configured as follows: in comparison with embodiment 1, the present invention has only a detection transmission mechanism for detecting rearward rotation of the grounding body 42 by the detection sensor 43, and omits a case rotation transmission mechanism for rotating the device main body 41 upward as the grounding body 42 rotates forward from the reference position. Therefore, in the cutting height detecting device 40, the housing rotation pin 84 is not provided in the driving arm 80, the housing rotation driving gear 86 is not provided in the rear rotation shaft 62, and the housing rotation driven gear 87 is not provided in the intermediate rotation shaft 70.

As described above, in the present embodiment, the device main body 41 does not include a transmission mechanism for housing rotation, and therefore, the structure for positioning the grounding body 42 is different from that of embodiment 1. A structure for positioning the grounding body 42 will be described.

The grounding member 42 according to the present embodiment is provided with: the 1 st grounding body return spring 221 and the 2 nd grounding body return spring 222 are positioned at predetermined reference positions for rotation about the rear rotation shaft 62 without receiving external force.

The rotation of the grounding body 42 about the rear rotation shaft 62 is biased in the rearward rotation direction by the 1 st grounding body return spring 221 via the drive arm 80. The 2 nd grounding body return spring 222 is used to bias the grounding body 42 in the forward rotation direction via the detection driven gear 77, the detection drive gear 76, and the drive arm 80. In the present embodiment, the base 81 of the drive arm 80 is a plate-like portion integral with the arm 82.

The 1 st grounding body return spring 221 is a so-called torsion spring, and has protruding portions 221a and 221b on both end sides of the coil-like portion. The 1 st grounding body return spring 221 is located on the right side of the detection drive gear 76, and is provided in a state in which the rear rotation shaft 62 penetrates the coil-shaped portion through the bush 223.

The 1 st grounding body return spring 221 causes one protruding portion 221a located on the right side of the coil-shaped portion to protrude rearward and downward and abut against the upper side of the boss 52f into which the fixing bolt 55 on the rear lower side of the right housing 52 is screwed, and causes the other protruding portion 221b located on the left side of the coil-shaped portion to be locked to the driving arm 80. The other protruding portion 221b is engaged with the drive arm 80 by abutting the detection pin 83 of the drive arm 80 from the lower side.

The 1 st grounding body return spring 221 applies a force to the drive arm 80 to rotate leftward in a left-hand view by a force in a direction to separate the protruding portions 221a and 221b from each other. Thereby, the ground contact body 42 is biased in the rearward rotation direction by the rear rotation shaft 62 to which the drive arm 80 is fixedly provided.

On the other hand, the 2 nd grounding body return spring 222 is a so-called torsion spring, and has protruding portions 222a, 222b on both end sides of the coil-like portion. The 2 nd grounding body return spring 222 is positioned on the right side of the detection driven gear 77, and is provided in a state in which the coil-shaped portion is fitted externally to the boss portion 52d and the intermediate rotation shaft 70 is penetrated.

The 2 nd grounding body return spring 222 causes one protruding portion 221a located on the right side of the coil-shaped portion to protrude upward and abut against the front side of the boss 52g into which the fixing bolt 55 on the upper rear side of the right housing 52 is screwed, and causes the other protruding portion 221b located on the left side of the coil-shaped portion to be locked to the detection driven gear 77. The other protruding portion 222b is bent toward the left side from the upper side, and abuts against an engagement convex portion 77b formed to protrude at an acute angle toward the radial outside on the front side of the detection driven gear 77, thereby engaging with the detection driven gear 77.

The 2 nd grounding body return spring 222 applies a force to the detection driven gear 77 to rotate leftward in a left view by a force in a direction to separate the protruding portions 222a and 222b from each other, and applies a force to the driving arm 80 to move the arm portion 82 rearward from the detection driving gear 76 engaged with the detection driven gear 77 by the detection pin 83. Thereby, the ground contact body 42 is biased in the forward rotation direction by the rear rotation shaft 62 to which the drive arm 80 is fixedly provided.

In this way, the force of the 1 st grounding body return spring 221 in the backward rotation direction of the grounding body 42 and the force of the 2 nd grounding body return spring 222 in the forward rotation direction of the grounding body 42 become resistance forces to each other. The urging forces of the two springs are set such that the urging force of the 2 nd grounding body return spring 222 in the forward rotation direction of the grounding body 42 is always larger than the urging force of the 1 st grounding body return spring 221 in the rearward rotation direction of the grounding body 42. As shown in fig. 25, a convex portion that forms the engagement surface 52s that receives the abutment of the rear end surface 76d of the detection drive gear 76 is provided at the rear portion of the right housing 52 and at the rear position of the detection drive gear 76. The rear end surface 76d of the detection drive gear 76 abuts against the engagement surface 52s, and the detection drive gear 76 is restricted from rotating rearward.

According to this configuration, the detection drive gear 76 is locked to the right housing 52 by the end surface 76d abutting against the locking surface 52s by the biasing force of the 2 nd grounding body return spring 22 in the forward rotation direction of the grounding body 42, and the rotation of the grounding body 42 to be rotated backward by the biasing force of the 1 st grounding body return spring 221 is stopped, and the rotation of the grounding body 42 in the reference state is restricted. Further, a structure for positioning the ground body 42 at the reference position may be formed as follows: the ground 42 is positioned at the reference position by setting the forces (torques) of the 1 st ground return spring 221 and the 2 nd ground return spring 222, which are resistances to each other as described above.

In the present embodiment, the structure of the case return spring 56 and the fixing plate 57 for urging the unit support 44 of the sensor unit 45 in the downward rotation direction about the 1 st axis P1 is different from that of embodiment 1 in that the downward rotation of the sensor unit 45 is restricted to the reference state. In the present embodiment, the housing stopper bolt 210 provided in the housing 51 restricts downward rotation of the sensor unit 45 to a reference state position, instead of the locking projection 53b.

The housing stopper bolt 210 is screw-inserted from the left side into the front-rear middle portion of the upper edge portion of the left housing 53, and projects the head portion from the left housing 53 toward the left side. The housing stopper bolt 210 is located near the rear side of the fixing bolt 55 located front-upper among the 4 fixing bolts 55. According to this configuration, in the reference state, the head of the housing stopper bolt 210 is brought into contact with the upper edge of the left side surface portion 44a of the unit support body 44, so that the sensor unit 45 cannot relatively rotate downward with respect to the unit support body 44.

(support Structure of cutting height detection device)

The support structure of the cutting height detection device 40 according to the present embodiment is different from that of embodiment 1 mainly in the structures of the front shaft support portion 130A and the rear shaft support portion 130B. The structure of the front shaft support 130A and the rear shaft support 130B according to the present embodiment will be described.

The front shaft support 130A includes: a stay 242 as a front support portion provided on the rear side of the seedling dividing plate 21; and a front support shaft 231 provided at the front end of the unit support 44 and supported by the stay 242. The front shaft support 130A has the following structure: the front support shaft 231 protruding forward from the unit support body 44 is supported by the support column 242 with respect to the rib 122 of the seedling dividing plate 21. That is, in the present embodiment, the tip end portion side of the harvest height detector 40 is attached to the seedling dividing plate 21 via the stay 242.

The front support shaft 231 protrudes forward from the front surface 44b of the unit support 44. The front support shaft 231 is provided so that a pin-shaped shaft body is fixed to the front surface 44b by welding or the like with the front-rear direction being the axial direction. The front support shaft 231 is a portion integral with the unit support 44, and has its axis aligned with the axis line O1.

The stay 242 is a member formed by bending an elongated rectangular plate-like member into an approximately L-shape, and has a fixed face 242a as a long face and a support face 242b as a short face as faces constituting corner portions of a right angle shape. The support column 242 is configured such that the fixing surface 242a overlaps the lower right side of the rib 122 in the longitudinal direction, and is fastened and fixed to the rib 122 at 2 positions in the front-rear direction by means of a bolt 245 penetrating the fixing surface 242a and the rib 122, a nut 246 receiving the screw insertion of the bolt 245, and the like.

The support column 242 is formed such that a support surface portion 242b bent from the rear side of the fixed surface portion 142a toward the left side is parallel to the front surface portion 44b of the unit support body 44 and faces the front side of the front surface portion 44 b. The support surface 242b has a support hole 242c through which the front support shaft 231 passes. The stay 242 penetrates the front support shaft 231 with play relative to the support hole 242c, and rotatably supports the front support shaft 231. The front support shaft 231 has a base 231a of an expanded diameter at a portion between the front surface 44b of the unit support body 44 and the support surface 242b of the support column 242, and the return spring 147 is provided in the base 231a in a fitted state.

The rear bearing 130B includes: a boss 232 as a rear supporting portion provided to the supporting frame 100; and a rear support shaft portion 241 provided at a rear end portion of the unit support body 44 and supported by the boss 232. The rear bearing 130B has the following structure: the rear support shaft portion 241 protruding rearward from the unit support body 44 is supported by the boss 232 provided on the support frame 100 via the support plate 143 and the support post 142. That is, in the present embodiment, the rear end portion side of the harvest height detection apparatus 40 is attached to the support frame 100 via the boss 232, the support column 142, and the support plate 143.

The rear support shaft portion 241 protrudes rearward from the rear surface portion 44d of the unit support body 44. The rear support shaft portion 241 is provided so that a pin-shaped shaft body is fixed to the rear surface portion 44d by welding or the like in the axial direction. The rear support shaft portion 241 is a portion integral with the unit support body 44, and makes the shaft center coincide with the shaft axis O1. That is, the rear support shaft portion 241 and the front support shaft portion 231 are disposed on the same axis.

The support column 142 has a support hole 142c formed in a support surface 142b facing the rear surface 44d of the unit support body 44, through which the rear support shaft 241 passes. The stay 142 penetrates the rear support shaft portion 241 with play relative to the support hole 142c, and rotatably supports the rear support shaft portion 241.

As shown in fig. 29, the protruding portion 232 is a hollow cylindrical portion in which the shaft supporting space 232b is formed by a cylindrical inner peripheral surface 232a, and the front side is an opening side, and the rear side is a tapered portion 232c having a tapered end. The boss 232 is provided by fixing a cylindrical member to the rear side of the rear surface portion 44d of the unit support 44 by welding or the like. The boss 232 is provided as: the outer diameter is smaller than the outer shape of the rear surface portion 44d, and is housed within the range of the outer shape of the rear surface portion 44d when viewed in the axial direction of the axis O1.

The rear support shaft portion 241 is rotatably supported by the boss portion 232 in a state where the rear portion thereof is inserted into the shaft support space 232 b. A cylindrical bushing 234 as a bearing member and an O-ring 236 provided on the front side thereof are interposed between the rear support shaft portion 241 and the inner peripheral surface 232a of the boss portion 232 as members through which the rear support shaft portion 241 passes.

The rear support shaft portion 241 is prevented from falling off from the boss 232 by a stopper screw 237 inserted spirally from the outside of the boss 232 toward the radial inside, and a lock nut 238. The lock nut 238 is fixed to the outer peripheral surface of the boss 232 by welding or the like. The stopper screw 237 is inserted into the lock nut 238 and penetrates the peripheral wall of the boss 232 to be engaged with the rear support shaft 241. The stopper screw 237 is engaged with the rear support shaft portion 241 by having its distal end portion positioned in the outer peripheral groove 241a, and the outer peripheral groove 241a is formed of a partially reduced diameter portion at a portion on the rear side of the bushing 234 of the rear support shaft portion 241.

In this way, the rear shaft support portion 130B supports the rear support shaft portion 241 provided at the rear portion of the unit support body 44 by the boss 232 via the support plate 143 and the stay 142, to the support frame 100. Thus, the rear bearing 130B supports the rear side of the harvest height detector 40 on the grain dividing portion 50 coaxially with the front bearing 130A and rotatably about the longitudinal axis.

As described above, the harvesting height detecting device 40 supports the unit support body 44 rotatably about the longitudinal axis O1 on the seedling dividing portion 50, thereby supporting the sensor unit 45 supported by the unit support body 44 so as to be swingable laterally. In such a support structure, the unit support body 44 has, at the front end portion and the rear end portion, a front support shaft portion 231 and a rear support shaft portion 241 as support shaft portions supported by the respective front and rear shaft support portions 130, respectively.

(action of cutting height detection device)

The operation of the cutting height detection device 40 according to the present embodiment will be described.

In normal operation of the combine harvester 1, the detection transmission mechanism functions in the harvest height detection device 40 to detect the harvest height, as in embodiment 1. That is, as shown in fig. 25, during the forward movement, the grounding body 42 rotates rearward about the 2 nd axis P2 integrally with the rear rotation shaft 62 due to the grounding sliding resistance (see arrow S1), and the driving arm 80 fixedly provided to the rear rotation shaft 62 rotates so that the arm 82 moves forward. As a result, the detection drive gear 76 is pressed by the detection pin 83, and is rotated relative to the rear rotation shaft 62 about the 2 nd axis P2 to the left in left-hand view, and the detection driven gear 77 engaged with the detection drive gear 76 is rotated integrally with the intermediate rotation shaft 70 about the 3 rd axis P3 to the right in left-hand view. The rotation of the intermediate rotation shaft 70 is detected by the detection sensor 43.

On the other hand, the harvesting height detecting device 40 of the present embodiment does not include a transmission mechanism for housing rotation, and therefore, when the combine harvester 1 is retracted, the grounding element 42 and the portion integral therewith rotate without accompanying the operation of the gears in the device main body 41. That is, as shown in fig. 25, at the time of the backward movement, the grounding body 42 rotates forward about the rear rotation shaft 62 from the reference position with respect to the housing 51 of the device main body 41 due to the grounding sliding resistance (see arrow S2). The grounding body 42 rotates integrally with the rear rotation shaft 62 about the 2 nd axis P2, and thereby the driving arm 80 fixedly provided to the rear rotation shaft 62 rotates so that the arm 82 moves rearward (see arrow S3). Here, the grounding body 42 rotates forward against the urging force of the 1 st grounding body return spring 221. When the ground contact body 42 starts to rotate forward from a state of being located at a rear rotation position from the reference position, for example, the ground contact body is rotated around the 1 st axis P1 by receiving a reaction force from the ground G1 so as to raise the device body 41, and is rotated forward so as to pass through the lower side of the device body 41. In fig. 25, the ground body 42 and the driving arm 80 are shown by two-dot chain lines in a maximum rotation state in which the ground body 42 rotates forward at a rotation angle of about 85 ° and abuts against the housing 51.

Next, another operation of the cutting height detecting device 40 according to the present embodiment will be described with reference to fig. 30. Fig. 30A shows a state in which the grounding body 42 is not grounded when the machine body is stopped, the cutting height detecting device 40 is in the reference state, and the grounding body 42 is located at the reference position.

The harvesting unit 5 is lowered (see arrow U1) from the state shown in fig. 30A so that the height of the seedling plate is 0, and the harvesting height detecting device 40 is rotated about the 1 st axis P1 (see arrow V1) based on the reaction force (grounding reaction force) from the ground G1 by grounding the grounding body 42 as shown in fig. 30B. As the device body 41 rotates about the 1 st axis P1, the cutting height detecting device 40 rotates the grounding body 42 forward relative to the device body 41 by the grounding reaction force (see arrow W1). Here, the rotation angle of the device body 41 with respect to the reference state is, for example, about 55 °, and the rotation angle of the grounding body 42 with respect to the reference position is, for example, about 10 °.

When the machine body is retracted from the state shown in fig. 30B with the height of the seedling plate kept at 0 (see arrow T1), the grounding body 42 is relatively rotated forward with respect to the device body 41 due to the grounding sliding resistance (see arrow W2) as shown in fig. 30C, and the device body 41 is rotated downward and returned to the position in the reference state by the biasing force of the housing return spring 56 or the like (see arrow V2). In this state, the grounding body 42 is in a maximum rotation state toward the front or a state substantially similar to this state.

On the other hand, when the machine body is advanced from the state shown in fig. 30B with the height of the seedling-dividing plate kept at 0 (see arrow T2), the grounding body 42 is relatively rotated backward with respect to the device body 41 due to the grounding sliding resistance (see arrow W3) as shown in fig. 30D, the device body 41 is rotated downward, and the device body is returned to the position in the reference state by the biasing force of the housing return spring 56 or the like (see arrow V3). In this state, the grounding body 42 is in the maximum rotation state toward the rear or in a state substantially similar to this state.

According to the harvesting height detecting device 40 of the present embodiment having the above-described configuration, in the configuration for detecting the harvesting height of the harvesting portion 5, as in the combine harvester 1 of embodiment 1, it is possible to eliminate a problem caused by the force acting on the ground contact body 42 from the ground G1 and the stub, and to detect the harvesting height with high accuracy.

Further, according to the support structure of the cutting height detection device 40 according to the present embodiment, the structure for detecting the cutting height of the cutting unit 5 can be stably supported, and defects such as breakage of the support unit due to external force can be suppressed, so that the cutting height can be detected with high accuracy.

The combine harvester according to the present invention described above by way of embodiments is not limited to the above embodiments, and various modes can be adopted within the scope of the gist of the present invention.

In the above embodiment, the harvest height detection device 40 is provided at the left end portion of the harvest support frame 20 that constitutes the harvest section 5, but the position where the harvest height detection device 40 is provided is not particularly limited. The cutting height detection device 40 may be provided at the right end portion of the cutting support frame 20 by, for example, being formed in a laterally symmetrical structure with the above-described embodiment. The cutting height detection device 40 may be provided at a plurality of locations by being provided at, for example, the left and right end portions of the cutting support frame 20.

In the above embodiment, the unit support body 44 has the left side surface portion 44a as a portion connecting the front surface portion 44b and the rear surface portion 44d, but the form of the unit support body 44 is not particularly limited. The unit support 44 may be formed, for example, as follows: has a right side surface portion located on the right side of the apparatus main body 41 as a portion connecting the front surface portion 44b and the rear surface portion 44 d.

Description of the reference numerals

1 … combine harvester; 4 … running machine body; 5 … harvesting part; 18 … hydraulic cylinders; 21 … seedling dividing plate; 34 … seedling dividing frame; 40 … cutting off a height detection device; 41 … device body; 42 … grounding body; 43 … detection sensor; 44 … unit support (apparatus main body support member); 44b … front surface portion; 44d … rear surface portions; 45 … sensor unit; 50 … seedling dividing part; 57 … fixed plate (rotation supporting portion); 61 … front fixed shaft (1 st shaft); 62 … rear rotation shaft (2 nd shaft); 70 … intermediate rotary shaft (3 rd shaft); 76 … detection drive gear (1 st transmission member); 77 … driven gear for detection (2 nd transmission member); 80 … drive arm (drive member); 83 … a detection pin (1 st input section for transmission member); 84 … housing rotation pin (3 rd transmission member input section); 86 … housing rotation drive gear (3 rd transmission member); a 87 … housing rotation driven gear (4 th transmission member); 100 … support frame; 113 … front inclined portions (inclined frame portions); 121 … dividing plate body; 122 … rib portions; 125 … feet (seedling dividing plate support members); 130 … shaft support; 130a … front axle support; 130B … rear bearing portion; 131 … front support shaft portion; 132 … bosses (front bearing); 141 … rear support shaft portion; 142 … struts (rear support); 231 … front support shaft portion; 232 … bosses (rear bearing); 241 … rear support shaft portion; 242 … struts (front support).

Claims (15)

1. A combine harvester is provided with: a cutting part which is arranged on the running machine body in a lifting manner; and a cutting height detection device for detecting the height of the cutting part,

it is characterized in that the method comprises the steps of,

the cutting height detection device comprises:

a device main body provided on the 1 st axis so as to be rotatable up and down;

a grounding body rotatably supported by a 2 nd shaft located behind the 1 st shaft; and

a detection sensor for detecting the rotation amount of the grounding body around the 2 nd axis,

the harvesting height detection device detects the height of the harvesting part based on the detection signal of the detection sensor.

2. A combine harvester according to claim 1, characterized in that,

the grounding body is provided with: with respect to the rotation about the 2 nd axis, is positioned at a prescribed reference position in a state of not receiving an external force,

the detection sensor detects a rotation amount of the ground body rearward from the reference position.

3. A combine harvester according to claim 2, characterized in that,

the grounding body rotates about the 2 nd axis relative to the device main body in a state of stopping rotation about the 1 st axis in a state of being located further rearward than the reference position.

4. A combine harvester according to claim 2 or 3, characterized in that,

the device body is configured to: the grounding body rotates around the 1 st axis in association with the rotation of the grounding body in a state of being located further forward than the reference position.

5. A combine harvester according to any one of claims 1 to 4, characterized in that,

the cutting height detection device comprises a 3 rd shaft which is rotated by receiving the transmission of the rotation force of the 2 nd shaft,

the detection sensor detects the rotation amount of the ground body around the 2 nd axis based on the rotation amount of the 3 rd axis.

6. A combine harvester according to claim 5, characterized in that,

the cutting height detection device comprises:

a 1 st transmission member rotatably supported by the 2 nd shaft; and

a 2 nd transmission member that receives transmission of the rotational force of the 2 nd shaft from the 1 st transmission member,

the 3 rd shaft receives transmission of the rotational force of the 2 nd shaft via the 1 st transmission member and the 2 nd transmission member.

7. A combine harvester according to claim 6, characterized in that,

the cutting height detection device is provided with a driving component fixed on the 2 nd shaft,

The driving member includes a 1 st transmission member input portion that transmits the 2 nd rotation caused by the rearward rotation of the ground contact body to the 1 st transmission member so that the 1 st transmission member rotates about the 2 nd axis.

8. A combine harvester according to any one of claims 5 to 7, characterized in that,

the cutting height detection device comprises:

a 3 rd transmission member rotatably supported by the 2 nd shaft;

a 4 th transmission member which is supported by the 3 rd shaft so as to be rotatable relative to each other and which receives transmission of rotational force of the 2 nd shaft from the 3 rd transmission member; and

and a rotation support unit that receives the rotation power of the 4 th transmission member and rotates the device body about the 1 st axis.

9. A combine harvester according to claim 8, characterized in that,

the cutting height detection device is provided with a driving component fixed on the 2 nd shaft,

the driving member includes a 3 rd transmission member input portion that transmits the 2 nd rotation caused by the forward rotation of the ground contact body to the 3 rd transmission member, and rotates the 3 rd transmission member around the 2 nd axis.

10. The combine harvester according to any one of claims 1 to 9, characterized in that,

the cutting height detection device is provided with a front shaft support part and a rear shaft support part which support the cutting height detection device to be rotatable around a shaft in the front-rear direction.

11. A combine harvester according to claim 10, characterized in that,

the cutting and taking part is provided with a seedling separating part,

the seedling dividing part includes: a seedling separating frame arranged at the lower part of the cutting part; a seedling dividing plate provided at a front side of the seedling dividing frame; and a supporting frame fixed to the seedling dividing frame,

the front shaft bearing part is arranged at the rear side of the seedling dividing plate, and the rear shaft bearing part is arranged at the bearing frame.

12. A combine harvester according to claim 11, characterized in that,

the cutting height detection device comprises a device body supporting member for supporting the device body to be rotatable up and down,

the front shaft support section has: a front support part which is arranged at the rear side of the seedling dividing plate; and a front support shaft portion provided at a front end portion of the apparatus main body support member and supported by the front support portion,

The rear shaft support portion includes: a rear support portion provided to the support frame; and a rear support shaft portion provided at a rear end portion of the apparatus main body support member and supported by the rear support portion.

13. A combine harvester according to claim 11, characterized in that,

the front shaft support portion is located forward of the grain dividing frame, and at least a part of the device main body is located forward of a front end of the grain dividing frame.

14. A combine harvester according to claim 11 or 13, characterized in that,

the seedling dividing part comprises a seedling dividing plate supporting component for supporting the seedling dividing plate on the seedling dividing frame,

the seedling dividing plate supporting component is arranged in an inclined shape with a lower front and a higher rear,

the supporting frame has an inclined frame part inclined from the rear side of the seedling dividing plate supporting part in a mode of being higher in front and lower in back,

the seedling dividing plate supporting member and the inclined frame portion are formed in a mountain-like shape with an upper side thereof being a convex side in a side view,

the harvesting height detection device is arranged between the seedling dividing plate supporting component and the inclined frame part.

15. A combine harvester according to claim 12, characterized in that,

The device body support member has a portion that overlaps at least a portion of the device body when viewed in the axial direction in the front-rear direction at the front end portion and the rear end portion, respectively.

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