JP4262170B2 - Support mechanism of gauge wheel in agricultural machine - Google Patents

Description

  The present invention relates to a support mechanism for a gauge wheel in an agricultural working machine such as a walking management machine equipped with a rotary.

Conventionally equipped with an engine, a transmission, a rotary for rotation driven by a driving force output by the transmission and a wheel, a rotary wheel is arranged in front of the wheel, and a gauge wheel that maintains a tilling depth is a gauge wheel arm. Is provided in front of the rotary so as to be able to swing up and down, a bracket is projected on the bearing side of the rotary shaft that supports the rotary, a swing fulcrum of the gauge ring arm is provided on the bracket, and the gauge ring arm is pivoted on the bracket. Agricultural machines equipped with a guide for guiding movement are known (see, for example, Patent Document 1).
JP-A-8-317702

  However, since the guide has a groove shape with an opening at the back, if mud or the like is scattered toward the guide when plowing with the rotary by being positioned in front of the rotary, the mud enters and adheres to the groove from the rear, and the gauge wheel arm There is a drawback that the swinging of the motor cannot be performed smoothly.

In order to solve the above-mentioned problems, a gauge wheel support mechanism in an agricultural machine according to the present invention includes an engine 9, a transmission, a rotary rotary 6 driven by a driving force output by the transmission, and a wheel 4. The rotary shaft 3 is disposed in front of the wheel 4, and a gauge wheel 23 that maintains the tilling depth is provided in a freely swingable manner in front of the rotary 6 via the gauge wheel arm 24. In the agricultural machine with the bracket 22 projecting on the bearing side, a swing fulcrum of the gauge wheel arm 24 is provided on the bracket 22, and a guide groove 37 for guiding the swing of the gauge wheel arm 24 is provided on the bracket 22. 37 is provided with a positioning portion 38 for positioning the swinging position of the gauge wheel arm 24. The positioning portion 38 is provided on the gauge wheel arm 24 side. Provided a positioning mechanism for positioning the over-di wheel arm 24, the positioning mechanism, a lever 31 provided swingably to the gauge wheel arm 24 side, consist of a cam 33 for pivoting the swing of the lever 31 The positioning mechanism is provided with an elastic member 34 that urges the cam 33 to the fixed posture R so that the gauge ring arm 24 is fixed, and the gauge ring arm 24 is swung by the swinging operation of the lever 31. The first feature is that the cam 33 is switched to the free posture F against the urging force of the elastic member 34 so as to be movable .

Second, the engine 9, the transmission, and the rotary 6 for tillage 6 driven by the driving force output by the transmission and the wheel 4 are provided. The rotary 6 is disposed in front of the wheel 4 to increase the tillage depth. In a farming machine in which a gauge wheel 23 to be maintained is provided in a vertically swingable manner in front of the rotary 6 via a gauge wheel arm 42, and a bracket 41 protrudes from the bearing side of the rotary shaft 3 that pivotally supports the rotary 6. 3 is provided with a swing fulcrum of the gauge wheel arm 42, a bracket 41 is provided with a positioning portion for positioning the swing position of the gauge wheel arm 42, and the gauge wheel arm 42 is attached to the positioning portion on the gauge wheel arm 42 side. a positioning mechanism for positioning provided, so that the gauge wheel arm 24, 42 can be removed by upward pivoting position, gauge wheels a It is characterized by forming the swing fulcrum portion of the arm 24, 42 in the notched shape.

Third, the positioning unit, composed of a plurality of positioning holes 51 along the swing trajectory of the gauge wheel arm 42, a positioning mechanism consisted resiliently pin 49 projecting from the gauge wheel arm 42 It is characterized by.

  According to the structure of the present invention configured as described above, since the positioning mechanism positions the swing of the gauge wheel arm with respect to the positioning portion in the guide structure, mud or the like from the front-rear direction has a groove ( There is an effect that the gauge wheel can be smoothly swung and positioned at a predetermined position. The positioning mechanism can be simply configured by configuring the positioning mechanism from a lever that is swingably provided on the gauge wheel arm side and a cam that is rotated by the swinging of the lever.

  At this time, the positioning mechanism is urged by an elastic member that urges the cam to a fixed posture so that the gauge wheel arm is fixed so that the gauge wheel arm can be moved by swinging the lever. By opposing the cam to a free posture, the gauge wheel arm can be moved by swinging by grasping the lever, and the gauge wheel arm can be fixed by releasing the lever. The positioning mechanism can be excellent.

  On the other hand, by configuring the gauge wheel arm to be mounted on the bearing side of the rotary shaft that supports the rotary so that the gauge wheel is attached, the gauge wheel arm's rocking fulcrum is stabilized, and the gauge wheel can be swung. In addition, there is an effect that positioning at a predetermined position can be performed smoothly and stably. Then, the positioning portion is composed of a plurality of positioning holes along the swinging locus of the gauge wheel arm, and the positioning mechanism is composed of a pin that is elastically projected from the gauge wheel arm. Can be configured easily.

  In any of the above cases, the gauge wheel arm can be formed in a notch shape so that the gauge wheel arm can be removed in the upward rotation position. Can easily be removed, and the gauge wheel can be easily removed to store the farming machine in a compact manner.

  1, 2, and 3 are a side perspective view, a plan perspective view, and a front perspective view of a walking management machine that is an agricultural working machine to which the present invention is applied. The mission case 1 constitutes the fuselage frame. An axle 2 is provided on the lower rear side of the transmission case 1 and a rotary shaft 3 is provided on the lower front side so as to protrude left and right. Wheels 4 are pivotally supported on the left and right axles 2. A rotary rotary 6 is pivotally supported on the left and right rotary shafts 3.

  A recess 7 is formed in front of the upper part of the mission case 1. An engine base 8 is attached to the recess 7. An engine 9 is mounted on the engine base 8. As a result, the engine 9 is attached to an upper position of the mission case 1 with a part thereof entering the recess 7. At this time, the center of gravity G of the engine 9 is located behind the intermediate position between the rotary shaft 3 and the axle 4.

  The transmission case 1 includes a transmission including a travel transmission mechanism that shifts the travel drive force for the wheels 4 and a rotary transmission mechanism that shifts the rotary drive force for the rotary 6. An input shaft 11 for driving force to the transmission projects from the rear upper side of the transmission case 1. The driving force of the engine 3 is output from the output shaft 12 of the engine 9.

  The input shaft 11 is disposed at a position above the axle 2 and behind the axle 2 in the mission case 1. The engine 9 is arranged such that the input shaft 11 is positioned behind a line L connecting the axle 2 and the output shaft 12 of the engine 9 in a side view.

  An output pulley 13 is supported on the output shaft 12 of the engine 3, and an input pulley 14 is supported on the input shaft 11 of the transmission 1. A driving force transmission belt 16 is wound between the output pulley 13 and the input pulley 14 via a main clutch comprising a tension clutch. As a result, the output from the engine 9 is transmitted to the transmission through the main clutch so as to be freely turned on and off.

  A bracket 17 is bolted to the rear of the mission case 1 obliquely upward. A handle 18 is attached to the bracket 17 obliquely rearward and upward. The handle 18 is provided with a clutch operating portion 19 for swinging the main clutch. The driving of the wheel 4 and the rotary 6 can be turned on and off by the clutch operating lever 19.

  From the mission case 1, a main operation lever 21 that operates to drive and shift the wheels 4 and the rotary 6 protrudes rearward. The main operation lever 21 protrudes rearward through a lever guide. The main operation lever 21 can be swung back and forth and left and right along the lever guide. The running speed and the driving speed and rotation direction of the rotary 6 are changed by the swing operation of the main transmission lever 21.

  The front of the transmission case 1 is a bearing portion that accommodates the bearing of the rotary shaft 3. A bracket 22 is bolted to the bearing in the transmission case 1 (the front end portion of the transmission case 1). A gauge wheel arm 24 is supported on the bracket 22 so as to freely swing up and down.

  The upper part of the rotary 6 is covered with a fender 26 fixed to the mission case 1. The front of the fender 26 is supported by the bracket 22. Accordingly, the fender 26 is stably attached to the body frame side.

  The walking type management machine is configured as described above, and the wheel 4 is grounded, and the operator holds the handle 18, operates the engine 9, enters the main clutch, and operates the rear wheel 4. The airframe travels by driving and the tillage work is performed by the rotary 6 that rotates as the airframe travels.

  The aircraft travels while the wheels 4 and the gauge wheels 23 are in contact with the ground. Since the positional relationship between the wheel 4 and the rotary 6 is fixed, the tillage depth is determined by the amount of the rotary 6 protruding downward from the straight line E connecting the ground point of the wheel 4 and the ground point of the gauge wheel 23. Therefore, the tilling depth is set and maintained by swinging the gauge wheel arm 24 and setting the height position of the gauge wheel 23.

  Also, as shown in FIG. 1, the height position of the gauge wheel 23 is set so that the rotary 6 does not protrude below a straight line E connecting the ground point of the wheel 4 and the ground point of the gauge wheel 23. The airframe can be easily moved without touching the ground 6.

  As described above, the engine 9 is attached to the transmission case 1 side with a part thereof entering the recess 7, and the input shaft 11 is behind the line L connecting the axle 2 and the output shaft 12 of the engine 9 in a side view. Is positioned so that the input shaft 11 is located behind the axle 2 and the center of gravity G of the engine 9 is located behind the intermediate position between the rotary shaft 3 and the axle 2. Is in position.

  As a result, the center of gravity of the fuselage becomes the low position of the fuselage and is located on the wheel 4 side (rear side), and the balance of the front and rear of the fuselage is heavy on the wheel 4 side and light on the rotary 6 side. As a result, the running stability of the airframe is improved due to the low center of gravity, and a load is applied to the wheel 4 side, so that the grounding property of the wheel 4 is high and the traction force is improved, so that the rotary 6 rotates forward in the X direction. Dashing and the like are prevented, and the running performance of the walking management machine is high.

  Further, when turning, the handle 18 is pushed down, and the front side is raised so that the rotary 6 and the gauge wheel 23 are separated from the tilling surface with the wheel 4 as a fulcrum. Also in this case, since the center of gravity of the fuselage is in the lower rear, the handle 18 can be easily pushed down with a small force, and the maneuverability of the walking management machine is high.

  Further, due to the low mounting position of the engine 9 and the arrangement of the input shaft 11, the output shaft 12, and the axle 2, the overall height and overall length of the airframe excluding the handle 18 and the gauge wheel 23 (gauge wheel arm 24) are both small, and the airframe is compact. Configured.

  On the other hand, as shown in FIGS. 4 (a) and 4 (b), the gauge ring arm 24 is pivotally supported at the tip thereof via a gauge ring shaft 27 so as to be freely rotatable. A fulcrum shaft 28 is pivotally supported at the base end portion. A cam shaft 29 is rotatably supported between the fulcrum shaft 28 and the gauge wheel shaft 27. A handle lever 31 is attached to the cam shaft 29 so as to rotate integrally. A portion of the cam shaft 29 protruding from the gauge wheel arm 24 is formed with a parallel flat 32 to constitute a cam 33.

  A tension spring 34 is provided between the handle lever 31 and the fulcrum shaft 28. The swinging position of the handle lever 31 (the rotational position of the cam shaft 29) is positioned by the free length of the tension spring 34. By grasping the handle lever 31 together with the gauge wheel arm 24, the handle lever 31 is swung against the urging force of the tension spring 34, and the cam shaft 29 rotates.

  As shown in FIGS. 5 and 6, the bracket 22 is configured by fixing two plates 35 to the transmission case 1 symmetrically. On the upper side of each plate 35 constituting the bracket 22, a notch-shaped fulcrum groove 36 opened on the upper side is provided. An arcuate guide groove 37 is formed in front of the plate 35 along the swinging locus of the cam shaft 29 when the gauge wheel arm 24 is swung around the fulcrum shaft 28 as an axis.

  The fulcrum shaft 28 of the gauge wheel arm 24 is inserted into the left and right fulcrum grooves 36, and the left and right cams 33 of the cam shaft 29 are inserted into the left and right guide grooves 37. As shown in FIG. 7, the guide groove 37 is formed so as to allow the movement of the cam 33 in the free posture F of the cam 33 where the flat 32 follows the arc locus of the guide groove 37. However, in the middle of the guide groove 37, a plurality of positions, positioning portions 38 are formed which are formed with holes having a diameter capable of rotating the cam 33 (cam shaft 29) so that the flat crosses the arc locus.

  As a result, when the cam 33 (cam shaft 29) is rotated so that the flat 32 intersects the arc locus in the positioning portion 38 and the cam 33 is set to the fixed posture R (see FIG. 7), the cam 33 comes out of the positioning portion 38. Cannot be fixed, and the position is fixed to the positioning portion 38. Thereby, as shown in FIG. 8, the swing angle of the gauge wheel arm 24 is positioned and fixed in a plurality of stages, and the height position of the gauge wheel 23, that is, the tilling depth is set.

  When the handle lever 31 (the rotational position of the cam shaft 29) is positioned by the free length of the tension spring 34, the flat 32 of the cam 33 intersects the arc locus, and when the handle lever 31 is gripped with the gauge wheel arm 24, The cam 33 (flat 32) is formed so that the flat 32 of the cam 33 follows the arc locus.

  As described above, the height of the gauge wheel 23 is adjusted by swinging the gauge wheel arm 24 by the swinging fulcrum formed by inserting the fulcrum shaft 28 into the fulcrum groove 36 by grasping the handle lever 31 together with the gauge wheel arm 24. The height of the gauge ring 23 can be determined by fixing the swing angle of the gauge ring arm 24 by releasing the handle lever 31 in the positioning portion 38.

  Alternatively, the handle lever 31 is gripped together with the gauge wheel arm 24, the cam 33 is positioned at a portion other than the positioning portion 38 of the guide groove 37, the handle lever 31 is released, and the gauge wheel arm 24 is swung as it is, so that the cam 33 is moved. When facing the positioning portion 38, the cam 33 is fitted into the positioning portion 38, and the cam 33 rotates so that the flat 32 intersects the arc locus by the urging force of the tension spring 34, so that the swing angle of the gauge ring arm 24 is automatically set. Therefore, the height of the gauge ring 23 is positioned by being fixed to the positioning portion 38.

  The positioning mechanism for positioning the gauge wheel arm 24 on the positioning portion 38 is simply configured by the cam shaft 29 (cam 33) and the handle lever 31 as described above. Since the wheel arm 24 can be easily swung, the positioning mechanism is excellent in operability, and the gauge wheel arm 23 can be easily positioned.

  Further, since the bracket 22 is disposed on the front side of the rotary 6, a large amount of mud or the like scatters toward the bracket 22 during plowing. However, since the guide groove 37 is formed of a groove that is not open on the front and rear sides, mud and the like are prevented from entering the guide groove 37 from the front and rear direction, and mud and the like enter and adhere to the guide groove 37. Less is.

  As a result, inconveniences such as inability to smoothly swing the gauge wheel arm 24 due to adhesion of mud or the like are prevented, and positioning of the gauge wheel 23 (swing movement of the gauge wheel arm 24) can be performed easily and smoothly. Can do.

  On the other hand, the upper side of the guide groove 37 in each plate 35 constituting the bracket 22 is curved outward (see FIG. 6). The guide groove 37 reaches the middle of the curved portion. As a result, the guide groove 37 is opened at the upper end, and the camshaft 29 can be removed from the guide groove 37 by swinging the gauge ring arm 24 upward as shown in FIG. .

  Further, since the fulcrum shaft 28 is inserted into the fulcrum groove 36 opened on the upper side, when the cam shaft 29 is removed from the guide groove 37 as described above, the fulcrum shaft 28 is removed from the opening of the fulcrum groove 36, and the gauge The wheel 23 can be removed from the bracket 22 together with the gauge wheel arm 24. The gauge wheel arm 24 can be easily assembled to the bracket 22 by reversing the above-described removal.

  Thereby, when it is unnecessary, the gauge wheel 23 can be easily removed, and the gauge wheel 23 can be easily removed to store the agricultural machine compactly. At this time, since the gauge wheel 23 is removed together with the gauge wheel arm 24, there is no arm projecting forward on the machine body side, and storage is easy and space-saving.

  On the other hand, as shown in FIG. 9, a single plate-like bracket 41 curved in an arc shape is provided between the bearing portion (front end portion of the mission case 1) and the fender 26 in the mission case 1, which is different from the above. The shaped gauge wheel arm 42 may be configured to pivotally support a flange 40 provided at the bearing portion (the front end portion of the mission case 1) in the mission case 1.

  As shown in FIGS. 10A and 10B, the gauge wheel arm 42 is pivotally supported at the tip thereof via a gauge wheel shaft 44 so as to freely rotate. A fulcrum shaft 46 is attached to the base end portion. On the other hand, a fulcrum groove 43 is formed in the flange 40 so as to open rearward, and a fulcrum shaft 46 is inserted into the fulcrum groove 43.

  The gauge ring arm 42 is provided with a guide pin 47 that comes into contact with the front and rear curved surfaces of the bracket 41 in a state where the fulcrum shaft 46 is inserted into the fulcrum groove 43. Thus, when the fulcrum shaft 46 is inserted into the fulcrum groove 43, the gauge ring arm 42 is swingably supported by the flange 40 while being guided by the guide pin 47 along the curved surface of the bracket 41.

  The gauge ring arm 42 is provided with a positioning pin 49 via a support mechanism 48. On the other hand, the bracket 41 is provided with a positioning portion including a plurality of positioning holes 51 along the swing locus of the pin 49. By inserting the pin 49 into any one of the positioning holes 51, the swing position of the gauge ring arm 42 is fixed, and the height of the gauge ring 23 is positioned.

  11A, 11B, and 11C, the support mechanism 48 is configured around a substantially U-shaped frame plate 52 that is integrally fixed to the gauge wheel arm 42. . A pin 49 is inserted into the frame plate 52 so as to be slidable in the insertion / removal direction. An operation plate 56 is integrally provided on the protruding end side of the pin 49 from the frame plate 52.

  The pin 49 is provided with a ring 53 in the frame plate 52. A compression spring 54 is provided between the ring 53 and the frame plate 52. The pin 49 is urged by the compression spring 54 in the direction in which the pin 49 is inserted into the positioning hole 51. However, the pin 49 is positioned at a position where the operation plate 56 and the frame plate 52 contact each other.

  The upper surface of the frame plate 52 is rectangular. The short side of the frame plate 52 is curved and fixed to the gauge wheel arm 42. The end of the operation plate 56 with respect to the long side of the upper surface of the frame plate 52 is curved downward and is located on the outer side of the frame plate 52. In this state, the pin 49 is urged by the compression spring 54 to protrude from the gauge wheel arm 42 and is inserted into the positioning hole 51 of the bracket 41.

  With the operation plate 56, the pin 49 can be removed from the positioning hole 51. When the pin 49 is removed from the predetermined positioning hole 51 and the operation plate 56 is rotated 90 degrees around the pin 49, the curved end of the operation plate 56 comes into contact with the upper surface of the frame plate 52, and the pin 49 extends from the positioning hole 51. The disconnected state is maintained. The pin 49 can be inserted into the other positioning hole 51 by rotating the operation plate 56 again by 90 degrees and positioning the curved portion of the operation plate 56 outside the frame plate 52.

  Therefore, as described above, the pin 49 is removed from the positioning hole 51, and the gauge wheel arm 42 is swung by the swinging fulcrum formed by inserting the fulcrum shaft 46 into the fulcrum groove 43. By inserting the pin 49 into the positioning hole 51 at a position opposite to the position 51, the swing angle of the gauge ring arm 42 can be adjusted and fixed, and the height of the gauge ring 23 can be adjusted for positioning.

  Alternatively, the pin 49 is removed from the positioning hole 51 as described above, and the pin 49 is positioned at a portion where the positioning hole 51 of the bracket 41 is not provided, so that the curved portion of the operation plate 56 is positioned outward of the frame plate 52. By rotating the plate 56 by 90 degrees and swinging the gauge ring arm 42 as it is, when the pin 49 is opposed to the other positioning hole 51, the pin 49 is automatically inserted into the positioning hole 51 by the urging force of the compression spring 54. Then, the swing angle of the gauge wheel arm 24 is automatically fixed to the positioning portion, and the height of the gauge wheel 23 is positioned.

  As described above, the pin 49 provided on the gauge wheel arm 42 via the support mechanism 48 constitutes a positioning mechanism for positioning the gauge wheel arm 42 in each positioning hole 51, whereby a positioning portion and a positioning mechanism including simple holes are formed. Is easily configured. Further, since the fulcrum shaft 46 of the gauge wheel arm 42 is pivotally supported on the bearing portion (front end portion of the mission case 1) side (flange 40) in the mission case 1, the swing fulcrum of the gauge wheel arm 42 is stabilized, The swinging operation and positioning of the gauge wheel 23 can be performed smoothly and stably.

  In addition, since each positioning part consists of a plurality of positioning holes 51 that are not opened forward or rearward, the point that mud or the like enters the respective positioning holes 51 from the front-rear direction and is attached thereto is the same as in the above embodiment. It is.

  On the other hand, a removal guide portion 57 directed rearward is provided in front of the upper portion of the bracket 41. As a result, as shown in FIG. 9, when the gauge wheel arm 42 is swung so that the front guide pin 47 is positioned at the removal guide portion 57, the gauge wheel arm 42 can be moved forward. By removing the fulcrum shaft 46 from the fulcrum groove 43, the gauge wheel 23 can be removed together with the gauge wheel arm 42. The effect of removing the gauge ring 23 is the same as that of the above embodiment.

It is a side perspective view of a walk type management machine. It is a plane perspective view of a walk type management machine. It is a front perspective view of a walk type management machine. (A), (b) is the top view and side view of a gauge ring arm single-piece | unit with which the gauge ring was attached. It is a side view of one plate which comprises a bracket. It is A arrow directional view of FIG. It is a principal part fragmentary view of a positioning part part. It is a principal part side view which shows the up-and-down rocking | fluctuation of a gauge ring. It is a principal part side view which shows the vertical rocking | fluctuation of the gauge ring of other embodiment. (A), (b) is the top view and side view of a gauge ring arm single-piece | unit with which the gauge ring of other embodiment was attached. (A), (b), (c) is the top view, back view, and side view which show the support mechanism single-piece | unit of a pin.

Explanation of symbols

4 Wheel 6 Rotary 9 Engine 22 Bracket 23 Gauge wheel 24 Gauge wheel arm 31 Handle lever (lever)
33 Cam 34 Tension spring (elastic member)
37 Guide groove 38 Positioning portion 41 Bracket 42 Gauge wheel arm 51 Positioning hole 49 Pin F Free posture R Fixed posture

Claims (3)

An engine (9), a transmission, and a rotary (6) and a wheel (4) for tillage driven by a driving force output by the transmission, and the rotary (6) is disposed in front of the wheel (4) And a rotary shaft (3) for pivotally supporting the rotary (6) by providing a gauge ring (23) for maintaining the tilling depth in a freely swingable manner in front of the rotary (6) via the gauge ring arm (24). In the agricultural machine having a bracket (22) projecting on the bearing side, a swing fulcrum of the gauge wheel arm (24) is provided on the bracket (22), and the gauge wheel arm (24) is swung on the bracket (22). A guide groove (37) for guiding is provided, a positioning portion (38) for positioning the swinging position of the gauge wheel arm (24) is provided in the guide groove (37), and the position determination is performed on the gauge wheel arm (24) side. Part (38) to provide a positioning mechanism for positioning the gauge wheel arm (24), the positioning mechanism, the lever provided swingably gauge wheel arm (24) side (31), said lever (31) An elastic member (34) that urges the cam (33) to a fixed posture (R) so that the gauge ring arm (24) is fixed to the positioning mechanism. ), And the positioning mechanism is operated against the urging force of the elastic member (34) so that the gauge ring arm (24) can be oscillated and moved by the oscillating operation of the lever (31). ) Support mechanism for the gauge wheel in the agricultural machine with a structure for switching to a free posture (F) . An engine (9), a transmission, and a rotary (6) and a wheel (4) for tillage driven by a driving force output by the transmission, and the rotary (6) is disposed in front of the wheel (4) A rotary shaft (3) for pivotally supporting the rotary (6) by providing a gauge ring (23) for maintaining the tilling depth in a freely swingable manner in front of the rotary (6) via the gauge ring arm (42). In the agricultural machine having a bracket (41) projecting on the bearing side of the rotary shaft (3), a swinging fulcrum of the gauge wheel arm (42) is provided on the bearing side of the rotary shaft (3), and the bracket (41) is provided with the gauge wheel arm (42). positioning portion for positioning the swing position is provided, the positioning mechanism for positioning the gauge wheel arm (42) in the positioning portion is provided in the gauge wheel arm (42) side, the gauge wheel arm (2 ), (42) so that it can Detach above rotating position, gauge wheel arm (24), the support mechanism of the gauge wheels in the rocking fulcrum of notch shape formed was agricultural machine (42). The positioning portion is composed of a plurality of positioning holes (51) along the swinging locus of the gauge wheel arm (42), and the positioning mechanism is a pin (49) that protrudes elastically from the gauge wheel arm (42). The support mechanism of the gauge ring | wheel in the agricultural machine of Claim 2 comprised from these.

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