Hammermore

Abstract

To provide a hammer mower that even though having a function of changing a height position, can be configured to be compact by preventing a machine body from being large-sized.SOLUTION: A hammer mower 1 comprising a work machine 3 for mowing in a farm field, the work machine disposed in front of a travel part 2, comprises a height adjustment mechanism 60 for adjusting the work machine's height by changing a height position of a front wheel 9 and fixing the changed height position of the front wheel. The front wheel 9 is disposed in the vicinity of a side part of a cutter cover 30 and an operation unit 62 for the height adjustment mechanism 60 is disposed above the cutter cover 30.SELECTED DRAWING: Figure 21

Description

[Technical field]

[0001] The present invention relates to the technology of a hammer mower for mowing grass. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been known a technique relating to a hammer mower in which a working implement for mowing grass in a farm field is disposed at the front of a traveling section and which performs grass cutting work while traveling (see Patent Document 1). The traveling section of the hammer mower includes a transmission case, an engine frame fixed to the transmission case, an engine mounted on the engine frame and serving as a power source for traveling and the working machine, a traveling shaft that is mounted across the transmission case and driven by power transmitted from the engine, traveling wheels fixed to the traveling shaft, and a cutter cover. The working machine of the hammer mower includes a cutter rotating shaft that is mounted across the cutter cover and driven by power transmitted from the engine, and a plurality of cutter blades are provided on the outer circumferential surface of the cutter rotating shaft.

[0003] Some hammer mowers are equipped with a height adjustment mechanism that adjusts the height of the working implement (cutter blade) higher or lower relative to the field. The height adjustment mechanism of the hammer mower includes, for example, a mechanism that changes the height position of the working implement (cutter blade) by changing the protruding position of the front wheels by rotating an operating part such as a handle, and a mechanism that changes the protruding position of the front wheels and fixes it with a pin or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 3-78920 Summary of the Invention [Problem to be solved by the invention]

[0005] However, some of the hammer mowers have front wheels arranged to protrude in front of the cutter cover, and an operating part for adjusting the height of the working implement in the height adjustment mechanism arranged to protrude in front or to the side of the machine body. The arrangement of the front wheels and the operating part of the height adjustment mechanism in this way increases the size of the machine body, which can make it difficult to mow grass in narrow places or in farm fields, for example.

[0006] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a hammer mower that has a compact structure even though it has a function for changing its height position. [Means for solving the problem]

[0007] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0008] That is, in claim 1, a hammer mower is provided with a working implement for mowing a field, which is disposed in front of a traveling part and performs mowing work while traveling, and the traveling part is provided with a transmission case and a Rue The engine frame includes an engine mounted on the engine frame and serving as a power source for traveling and working machines, a traveling shaft that is supported on the transmission case and driven by the power transmitted from the engine, and a transmission provided on the traveling shaft. RunThe working machine is provided with a side wheel, a cutter cover that covers the upper part of the working machine, and a front wheel provided near the cutter cover, and the working machine is configured such that a cutter rotating shaft that is driven by the power transmitted from the engine is traversed within the cutter cover, and a plurality of cutter blades are provided on the outer circumferential surface of the cutter rotating shaft, and a height adjustment mechanism is provided that adjusts the height of the working machine by changing the height position of the front wheel and fixing the changed height position of the front wheel to raise or lower the height of the working machine, and the front wheel is provided near the side of the cutter cover. The height adjustment mechanism is arranged on a work machine and includes an operating unit that is operated by an operator when adjusting the height of the work machine, and the operating unit of the height adjustment mechanism is arranged above the cutter cover, and the height adjustment mechanism includes a rotating unit that supports the front wheel near the side of the cutter cover and is configured to be rotatable around the axis of the cutter rotation shaft, and the operating unit is configured such that, when operated by an operator, the rotating unit is rotated to change the height position of the front wheel and the rotating position of the rotating unit is fixed.

[0009] Claim 2 In the present invention, the rotating part of the height adjustment mechanism comprises a pair of left and right support members that are arranged on the outside of the side panels of the cutter cover, and the support members of the rotating part are configured to be rotatable around the axis of the cutter rotation shaft and support a front wheel at one end thereof, and the rotation position of the front wheel is changed by the support members of the rotating part rotating around the axis of the cutter rotation shaft.

[0010] Claim 3 The cutter cover is provided with a rebound prevention plate that prevents stones and other objects that are bounced forward when the work machine is operating to cut grass from bouncing back and hitting the operator, and the rebound prevention plate is provided at the front end of the cutter cover.

[0011] Claim 4In the hammer mower, the hammer mower is provided with a handle that is gripped by an operator when driving or mowing, and the anti-bounce plate is provided with a driving guide, and when the hammer mower is driven by an operator holding the handle, the hammer mower is driven so that the driving guide of the anti-bounce plate is aligned with a specified object in the field as seen by the operator, thereby stabilizing the driving path of the hammer mower.

[0012] Claim 5 In the above, the cutter cover is provided with a protective plate that is positioned inside the cutter cover and prevents stones, grass, etc. that are kicked up when the working machine performs a grass-cutting operation from directly contacting the cutter cover.

[0013] In claim 6, the present invention provides a power take-off shaft for transmitting power from the engine, the power take-off shaft being inserted into the belt cover and having a pulley provided therein, the cutter rotation shaft being inserted into the belt cover and having a pulley provided therein, and a belt being wound between the pulley of the power take-off shaft and the pulley of the cutter rotation shaft within the belt cover, so that power from the engine is transmitted to the cutter rotation shaft, and a belt tensioning mechanism is provided that applies tension to the belt disposed within the belt cover and is configured to absorb impacts to the belt, vibrations of the belt, and the like, and the belt tensioning mechanism is a case fixed to the belt cover; The movable member is disposed in the case and is movable along the axial direction of the case. , Kan A moving arm having a through hole, a biasing spring for biasing the moving arm toward the belt, a support shaft inserted into the through hole of the moving arm, and a support shaft inserted into the support shaft. Be and a bearing that is rotatable while in contact with the belt. Effect of the Invention

[0014] The present invention has the following advantages. That is, according to the present invention, even if the device has a function of changing the height position, the device can be configured compactly while preventing the device from becoming large in size. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing a hammer mower according to an embodiment of the present invention. [Diagram 2] A front view of the hammer mower. [Diagram 3] A rear view of the same hammer mower. [Figure 4] Also a plan view showing the hammer mower. [Diagram 5] Also a bottom view showing the hammer mower. [Figure 6] A left side view of the same hammer mower. [Figure 7] Right side also showing a hammer mower. [Figure 8] An enlarged side view of the front of the Hammermore. [Figure 9] FIG. 4 is an enlarged side view showing the vicinity of the viewing window of the hammer mower. [Figure 10] FIG. 4 is an enlarged perspective view showing the vicinity of the running wheels of the hammer mower. [Figure 11] This is an enlarged view of the hammer mower with the running wheels disassembled from the running shaft. [Figure 12] FIG. 4 is a plan sectional view showing the running shaft and running wheels of the hammer mower. [Figure 13] FIG. 4 is a front cross-sectional view showing the running shaft and running wheels of the hammer mower. [Figure 14] FIG. 4 is a plan sectional view showing the running shaft and running wheels of the hammer mower. [Figure 15] FIG. 4 is a plan sectional view showing the running shaft and running wheels of the hammer mower. [Figure 16] FIG. 4 is a plan sectional view showing the running shaft and running wheels of the hammer mower. [Figure 17] FIG. 4 is an enlarged perspective view showing the vicinity of the running wheels of the hammer mower. [Figure 18]FIG. 4 is a plan sectional view showing the running shaft and running wheels of the hammer mower. [Figure 19] (a) An enlarged perspective view of the rear of the hammer mower, (b) An enlarged perspective view of the rear of the hammer mower. [Figure 20] An enlarged perspective view of the front of the Hammermower. [Figure 21] An enlarged side view of the front of the Hammermore. [Figure 22] FIG. 4 is an enlarged plan view showing an operating portion of the height adjustment mechanism of the hammer mower. [Diagram 23] FIG. 4 is an enlarged side view showing the hammer mower with the working implement positioned lowered. [Figure 24] FIG. 4 is an enlarged plan view showing the operating part of the hammer mower with the working implement positioned lowered. [Diagram 25] FIG. 4 is an enlarged side view showing the hammer mower with the working implement positioned at a higher position. [Figure 26] FIG. 11 is a large side plan view showing the operating part of the hammer mower with the working implement positioned at a high position. [Figure 27] FIG. 4 is a front view showing an operating part of the height adjustment mechanism of the hammer mower. [Figure 28] FIG. 13 is a front view showing an operating part of a height adjustment mechanism of the hammer mower. [Figure 29] An enlarged front view of the hammer mower. [Diagram 30] An enlarged plan view of the same hammer mower. [Diagram 31] FIG. 4 is an enlarged perspective view showing the inside of the cutter cover of the hammer mower. [Diagram 32] FIG. 4 is an enlarged cross-sectional side view showing the inside of the cutter cover of the hammer mower. [Diagram 33] An enlarged side view showing the inside of the belt cover of the hammer mower. [Diagram 34] FIG. 2 is a front cross-sectional view showing the hammer mower belt cover and belt tensioning mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Next, a hammer mower 1 according to an embodiment of the present invention will be described with reference to FIGS. As shown in Figs. 1 to 7, the hammer mower 1 is a walk-behind hammer mower including a traveling section 2 and a working implement 3, and is configured such that the working implement 3 is disposed in front of the traveling section 2 for mowing grass in a farm field. The running unit 2 is configured to be capable of traveling in the forward and backward directions while an operator is gripping the handle 17. The running unit 2 includes a transmission case 4, an engine frame 5, an engine 6, a running shaft 7, running wheels 8, a handle 17, a cutter cover 40, a front wheel 9, a belt cover 10, and a belt cover 11. The traveling part 2 is fixed to a transmission case 4, and an engine frame 5 protrudes rearward from the transmission case 4. An engine 6 is mounted on the engine frame 5, and the engine 6 serves as a power source for traveling and for the working machine 3. A traveling shaft 7, which is driven by the power transmitted from the engine 6, is horizontally mounted on the lower part of the transmission case 4, and traveling wheels 8, 8 are mounted on the traveling shaft 7. The working machine 3 is attached to the front part of the transmission case 4. A speed change lever 20 is provided so as to extend rearward and upward from the left side part of the transmission case 4. A handle 17, which is held by an operator when traveling or mowing, is provided on the upper part of the transmission case 4 so as to extend rearward and upward. A traveling clutch lever 18, a working clutch lever 19, a back handle 21, etc. are arranged on the handle 17. The traveling of the hammer mower 1 can be controlled by the traveling clutch lever 18, the back handle 21, etc., and the operation of the working machine 3 (for example, the rotation speed of the cutter rotating shaft 30, etc.) can be controlled by the working clutch lever 19. A cutter cover 40 is provided at the front end of the transmission case 4 via a mounting plate 32, a connecting plate 33, etc., and a pair of left and right front wheels 9, 9 are provided near both sides of the cutter cover 40. The front wheels 9 are in contact with the field below the work machine 3.

[0017] The work machine 3 mows grass in a field by winding up the grass with power transmitted from the engine 6. As shown in FIG. The work machine 3 has a cutter rotation shaft 30 that is driven by power transmitted from the engine 6 and is installed horizontally inside the cutter cover 40 (at the bottom of the cutter cover 40), and the bases of multiple cutter blades 31·31···, which are Y-shaped when viewed from the front, are attached to the outer circumferential surface of the cutter rotation shaft 30 via stays. When the cutter rotating shaft 30 rotates at high speed, the cutter blades 31·31··· are able to protrude perpendicularly (radially) to the cutter rotating shaft 30 by centrifugal force to cut grass. Furthermore, in the unlikely event that the cutter blade 31 comes into contact with soil in the field or stones rolling on the field surface, the cutter blades 31 are configured to rotate around the axis of the stay to move away from the contact, thereby preventing damage.

[0018] Next, the power transmission configuration from the engine 6 will be described. A power take-off shaft protrudes from the left side of the engine 6, and the power from the engine 6 is transmitted via the power take-off shaft to pulleys, belts, etc. in a belt cover 10 located to the left of the transmission case 4, and then to an input shaft that protrudes to the right from approximately the center of the front-to-rear of the belt cover 10 and is inserted into the transmission case 4, and then transmitted to the transmission case 4. In addition, the power from the engine 6 is transmitted to pulleys, belts, etc. in the belt cover 10 via the power take-off shaft of the engine 6, and is then transmitted to a power take-off shaft that protrudes to the right from the front of the belt cover 10 and is positioned in the shaft cover 12. The power take-off shaft is inserted into the upper rear part of the belt cover 11, and a pulley 14 is provided at its protruding end (right end) inside the belt cover 11. The cutter rotation shaft 30 is inserted into the lower front part of the belt cover 11, and a pulley 15 is provided at its protruding end (right end) inside the belt cover 11. A belt 16 is wound between the pulleys 14 and 15. In this way, the power from the engine 6 is transmitted to the power take-off shaft, then to the pulley and belt 16 inside the belt cover 11, and finally to the cutter rotation shaft 30 (see FIG. 33).

[0019] As shown in Figures 1 to 7, the cutter cover 40 comprises a main plate 41, a pair of left and right side plates 42, a bearing 43, and a shaft cover 44, and is configured to cover the upper side of the working machine 3 (the cutter rotation shaft 30 and cutter blade 31 of the working machine 3, etc.) and to be open below. The main plate 41 of the cutter cover 40 is formed by bending a flat metal member. The front part of the main plate 41 is inclined downward from the front to the rear and the main plate 41 is formed in an arc shape from the midpoint of the front to the rear in a side view. A pair of left and right side plates 42 of the cutter cover 40 are configured to be fixed so that their upper edges are connected to the main plate 41. The pair of left and right side plates 42 rotatably support the cutter rotation shaft 30. Each of the pair of left and right side plates 42 has a through hole formed in approximately the center thereof, in which a bearing 43 and bearings, etc. are disposed, and the left and right ends of the cutter rotation shaft 30 are inserted into the bearings 43, etc., to rotatably support the cutter rotation shaft 30. The shaft cover 44 of the cutter cover 40 is disposed in the through hole of the left side plate 42, and is configured to cover the left end of the cutter rotation shaft 30 (see Figures 8 to 9).

[0020] As shown in FIG. 8 or 9, the cutter cover 40 includes a viewing window 45. The viewing window 45 is configured to allow an operator to visually check the state of the rotational movement of the cutter rotation shaft 30 (cutter blade 31) from outside the cutter cover 40. The viewing window 45 is provided in the left side plate 42 of the cutter cover 40. The viewing window 45 is provided in the shaft cover 44 of the left side plate 42 of the cutter cover 40. The viewing window 45 is configured by being formed so as to penetrate the center of the shaft cover 44 in the left-right direction. A lid body 46, which is a disk-shaped member made of a transparent resin material, is provided to the viewing window 45.

[0021] As described above, the cutter cover 40 is provided with a viewing window 45 configured to enable the operator to visually check the state of the rotational movement of the cutter rotation shaft 30 from outside the cutter cover 40. Therefore, after turning the working lever to the OFF position while the work machine 3 is performing a grass cutting operation, the operator can look at the state of the cutter rotation shaft 30 through the viewing window 45 and visually confirm from outside the cutter cover 40 whether the rotational movement of the cutter rotation shaft 30 (cutter blade 31) has stopped. Therefore, the work efficiency can be improved and safety can be ensured.

[0022] Furthermore, as described above, since the viewing window 45 is provided in the shaft cover 44 (the center of the shaft cover 44) of the cutter cover 40, the operator can more reliably visually check the state of the rotational movement of the cutter rotation shaft 30 and more reliably recognize whether the rotational movement of the cutter rotation shaft 30 (cutter blade 31) has stopped.

[0023] A visual identification mark 47 is provided on the surface of the left end of the cutter rotation shaft 30. The visual identification mark 47 makes it easier for an operator to visually recognize the state of the rotational operation of the cutter rotation shaft 30 through the viewing window 45. The visual identification mark 47 is colored in a color (e.g., yellow) that makes it easier for an operator to visually recognize the state of the rotational operation of the cutter rotation shaft 30 through the viewing window 45. The visual identification mark 47 is configured in a linear shape and is provided at a position eccentric from the axis. The visual identification mark 47 is provided so as to extend in a radial direction from the axis.

[0024] As described above, since the visual mark 47 is provided on the surface of the left end of the cutter rotation shaft 30, the operator can more reliably visually confirm the state of the rotational movement of the cutter rotation shaft 30 by visually checking the rotation of the visual mark 47, and can more reliably recognize whether the rotational movement of the cutter rotation shaft 30 (cutter blade 31) has stopped.

[0025] It is to be noted that the viewing window 45 may not be provided with the lid 46. The lid 46 is not limited to being transparent and may be made of, for example, semi-transparent material, and may be made of, for example, glass material instead of resin material. The lid 46 may be made of a magnifying glass that allows an operator to visually check the state of the rotational operation of the cutter rotation shaft 30 in a magnified manner. Furthermore, the visual identification mark 47 is not limited to being linear, but may be any shape that makes it easy to visually identify the state of the rotational movement of the cutter rotation shaft 30, and may be, for example, a single or multiple circles or squares, or a spiral shape provided over the entire surface of the left end of the cutter rotation shaft 30.

[0026] As shown in Figures 10 to 13, the running wheel 8 has a wheel 23, and with the running shaft 7 inserted into the cylindrical portion 24 of the wheel 23, a washer 25 and a fastener 26 such as a screw are attached to the end of the running shaft 7, and the running wheel 8 is attached to the running shaft 7. The running wheels 8 are configured to be able to rotate freely (not rotate) with respect to the running shaft 7 in a region of a predetermined rotation angle of the running shaft 7 when the running shaft 7 rotates. The running wheels 8 are configured to be able to be fixed to the running shaft 7 by a fixing pin 54 described later. The traveling shaft 7 has a plurality (three) of mounting holes 22 at each of its left and right ends (portions where the traveling wheels 8 are attached). The mounting holes 22 are arranged in a line along the axial direction of the traveling shaft 7 at predetermined intervals, and are configured so that the fixing pin 54 can be inserted therethrough. The number of mounting holes 22 is not limited to three, and may be two or four or more. The fixing pin 54 is used to fix and attach the contact member 50 or the running wheel 8, which will be described later, to the running shaft 7.

[0027] The running wheel 8 has a protrusion 27 on the wheel 23 . The protrusion 27 of the running wheel 8 is a cylindrical member that is configured to protrude inward from the inner surface (the surface on the machine body side) of the wheel 23. The protrusion 27 of the running wheel 8 is disposed near the cylindrical portion 24 of the wheel 23.

[0028] The hammer mower 1 includes a contact member 50 on the traveling shaft 7 . The abutment member 50 is attached to the traveling shaft 7. The abutment member 50 includes a main body 51 and a pair of abutment bodies 52,52. The body 51 of the abutting member 50 is cylindrical and configured to allow the traveling shaft 7 to be inserted therethrough. The body 51 of the abutting member 50 has a pair of through holes 53 penetrating in a direction perpendicular to the axial direction. The pair of through holes 53, 53 of the body 51 of the abutting member 50 are disposed to be shifted in phase by 180° from each other, and are configured to allow a fixing pin 54, described later, to be inserted therethrough. The pair of abutment bodies 52 of the abutment member 50 are provided so as to protrude from the outer surface of the main body 51 in a direction perpendicular to the axial direction of the main body 51. The abutment body 52 of the abutment member 50 is disposed outside the through hole 53 of the main body 51. The pair of abutment bodies 52 of the abutment member 50 are disposed so as to be shifted in phase from each other by 180°. The abutment body 52 of the abutment member 50 is disposed so as to be shifted in phase from the location where the through hole 53 of the main body 51 is disposed. The contact body 52 of the contact member 50 is configured so as to be able to come into contact with the protrusion 27 of the running wheel 8 when the running shaft 7 rotates. The abutting body 52 of the abutting member 50 is not limited to a pair, and may be, for example, a single piece, and the abutting body 52 of the abutting member 50 is not limited to being arranged to be out of phase with the location of the through hole 53 of the main body 51 by 90°. The abutting body 52 of the abutting member 50 may also be configured to protrude from the outer surface of the main body 51 in the axial direction of the main body 51 (see FIG. 17 or FIG. 18).

[0029] The abutment member 50 is attached to the traveling shaft 7 by, for example, inserting a fixing pin 54 into the through hole 53 of the main body 51 and the mounting hole 22 of the traveling shaft 7 while aligning the through hole 53 of the main body 51 with the innermost (machine body side) mounting hole 22 of the three mounting holes 22 of the traveling shaft 7. At this time, a snap pin is provided to prevent the fixing pin 54 from falling out of the through hole 53 of the main body 51 and the mounting hole 22 of the traveling shaft 7. The contact member 50 is configured to rotate together with the traveling shaft 7 when attached to the traveling shaft 7 .

[0030] The running wheel 8 is attached to the running shaft 7 so that the wheel 23 is disposed outside the contact member 50 with the contact member 50 attached to the running shaft 7 as described above. With this configuration, the running wheel 8 is configured to rotate when the running shaft 7 rotates and the abutment body 52 of the abutment member 50 abuts against the protrusion 27 of the running wheel 8. Also, the running wheel 8 is configured so that the abutment body 52 of the abutment member 50 does not abut against the protrusion 27 of the running wheel 8 in a region of a predetermined rotation angle (approximately 130° in this embodiment) of the running shaft 7 when the running shaft 7 rotates. In other words, the running wheel 8 is configured to rotate (not rotate) freely with respect to the running wheel 8 in a region of approximately 130° (predetermined rotation angle) of the running shaft 7 when the running shaft 7 rotates.

[0031] As described above, the running wheels 8 are configured to be able to rotate freely (not rotate) relative to the running shaft 7 within a range of a predetermined rotation angle of the running shaft 7 when the running shaft 7 rotates, so that the hammer mower 1 can be easily turned and operability can be improved.

[0032] As described above, the running wheel 8 is provided with the protrusion 27 on the wheel 23, the abutment member 50 is configured to rotate together with the rotation of the running shaft 7 while attached to the running shaft 7, the abutment body 52 of the abutment member 50 is configured to be able to abut against the protrusion 27 of the running wheel 8 when the running shaft 7 rotates, and the running wheel 8 is configured to rotate when the running shaft 7 rotates and the abutment body 52 of the abutment member 50 abuts against the protrusion 27 of the running wheel 8, and when the running shaft 7 rotates, in the range of a predetermined rotation angle of the running shaft 7, the abutment body 52 of the abutment member 50 does not abut against the protrusion 27 of the running wheel 8 but rotates freely relative to the running wheel 8. As a result, a simple configuration can be realized that allows the hammer mower 1 to easily perform turning operations.

[0033] The running wheel 8 is configured so that it can be set to either a state in which it spins freely relative to the running shaft 7 in a range of a predetermined rotation angle of the running shaft 7 when the running shaft 7 rotates, or a configuration in which it is fixed to the running shaft 7 and rotates together with the running shaft 7 when the running shaft 7 rotates. The following describes a setting in which the running wheels 8 rotate together with the running shaft 7 when the running shaft 7 rotates. 14, the cylindrical portion 24 of the outer wheel 23 of the running wheel 8 has a pair of through holes 28 that penetrate in a direction perpendicular to the axial direction. The pair of through holes 28, 28 of the cylindrical portion 24 of the outer wheel 23 of the running wheel 8 are arranged to be shifted in phase by 180° from each other, and are configured to allow a fixing pin 54 to be inserted therethrough. The fixing pin 54 attached to the abutment member 50 on the running axle 7 is removed, and the through hole 28 of the wheel 23 of the running wheel 8 is aligned with the outermost mounting hole 22 (opposite the machine body) of the three mounting holes 22 of the running axle 7, and the removed fixing pin 54 is inserted through the through hole 28 of the wheel 23 of the running wheel 8 and the mounting hole 22 of the running axle 7, thereby fixing the running wheel 8 to the running axle 7. At this time, a snap pin is provided on the fixing pin 54 to prevent it from falling out of the through hole 28 of the wheel 23 and the mounting hole 22 of the running axle 7. At this time, the abutment member 50 may be disposed inside the running wheel 8 with the running axle 7 inserted therethrough, or may be removed from the running axle 7. In this state where the running wheels 8 are attached to the running shaft 7, they are configured to rotate together with the running shaft 7 when the running shaft 7 rotates. In this configuration where the running wheels 8 are configured to rotate together with the running shaft 7 when the running shaft 7 rotates, for example, it is possible to improve operability when traveling from a flat farm field to a downhill slope.

[0034] As described above, the running wheels 8 can be set to either a state in which they spin freely relative to the running axle 7 in a range of a predetermined rotation angle of the running axle 7 when the running axle 7 rotates, or a configuration in which they rotate together with the running axle 7 when the running axle 7 rotates. Therefore, the setting can be changed according to the situation to perform running in a state with improved operability.

[0035] The running wheels 8 are configured to rotate together with the running shaft 7 when the running shaft 7 rotates, and are configured so that their arrangement positions can be set to either the outside or the inside. The running wheels 8 will be described with their arrangement position on the inside. 15, the running wheel 8 can be fixed to the running axle 7 by inserting the fixing pin 54 into the through hole 28 of the wheel 23 of the running wheel 8 and the mounting hole 22 of the running axle 7 with the through hole 28 of the wheel 23 of the running wheel 8 aligned with the central mounting hole 22 of the three mounting holes 22 of the running axle 7. At this time, a snap pin is provided on the fixing pin 54 to prevent it from falling out of the through hole 28 of the wheel 23 and the mounting hole 22 of the running axle 7. At this time, the abutting member 50 may be disposed inside the running wheel 8 with the running axle 7 inserted therethrough, or may be removed from the running axle 7. 16, the running wheel 8 can be fixed to the running axle 7 by inserting the fixing pin 54 into the through hole 28 of the wheel 23 of the running wheel 8 and the mounting hole 22 of the running axle 7 with the through hole 28 of the wheel 23 of the running wheel 8 aligned with the innermost mounting hole 22 of the three mounting holes 22 of the running axle 7. At this time, a snap pin is provided on the fixing pin 54 to prevent it from falling out of the through hole 28 of the wheel 23 and the mounting hole 22 of the running axle 7. At this time, the abutting member 50 may be disposed on the running axle 7 on the outside of the running wheel 8 with the running axle 7 inserted therethrough, or may be removed from the running axle 7. By fixing the running wheel 8 to the running axle 7 in this manner, the running wheel 8 is positioned inward (towards the body) than the position of the running wheel 8 when the fixing pin 54 is inserted through the through hole 28 of the wheel 23 of the running wheel 8 and the outermost mounting hole 22 of the three mounting holes 22 of the running axle 7. By arranging the running wheels 8 in this manner, the turning operation of the hammer mower 1 can be performed relatively easily, and the operability can be relatively improved.

[0036] It is also possible to provide a configuration in which two fixing pins 54 are provided, and with one of the fixing pins 54 used to attach the abutment member 50 to the running shaft 7, the other fixing pin 54 is inserted through the through hole 28 of the wheel 23 of the running wheel 8 and the mounting hole 22 of the running shaft 7, thereby fixing the running wheel 8 to the running shaft 7.

[0037] As shown in FIG. 19( a ), the hammer mower 1 includes a pin arrangement portion 29 . The pin arrangement portion 29 is configured so that the fixing pin 54 can be arranged therein. The pin arrangement portion 29 is configured as a through hole formed in a flat metal member that is provided at the rear end portion of the engine frame 5 (the rear end portion of the aircraft) and that is inclined from front-upper to rear-lower. The through hole is configured so that the body portion of the fixing pin 54 can be inserted therethrough, and is configured with a diameter smaller than that of the head portion of the fixing pin 54. A pair of pin arrangement portions 29 are formed on the left and right. When the fixing pin 54 is not used to fix the running wheel 8 or the abutment member 50 to the running shaft 7, the fixing pin 54 not used to fix the running shaft 7 is inserted into the pin arrangement section 29 with its head facing upward, so that the head of the fixing pin 54 is caught and held, and the fixing pin 54 is arranged in the pin arrangement section 29. Also, by providing a snap pin on the fixing pin 54 with its head facing downward and its body inserted into the pin arrangement section 29, the fixing pin 54 is arranged in the pin arrangement section 29 with the snap pin caught.

[0038] As described above, since the pin arrangement section 29 is provided, for example, an unused fixing pin 54 (one of the two fixing pins 54) can be arranged in the pin arrangement section 29, thereby preventing the fixing pin 54 from being lost. 19(b), the pin arrangement portion 29 is configured to be able to arrange a fixing pin 54. The pin arrangement portion 29 can also be configured to be arranged in front of a flat plate-shaped member that is inclined front-upper, rear-lower and at the rear end portion of the engine frame 5 (at the rear end portion of the engine frame 5).

[0039] Handle 17 is configured to be approximately U-shaped in plan view by bending a single approximately round bar-shaped member. The rear portion of handle 17 (the bottom portion configured in the approximately U-shape) is configured as a part that is gripped by the operator when traveling or mowing the grass. The work clutch lever 19 controls the grass cutting operation of the work machine 3, and is provided on the left side of the handle 17.

[0040] The traveling clutch lever 18 is used to operate the hammer mower 1 to travel or stop (ON / OFF operation of traveling). As shown in Figs. 1 to 7, the traveling clutch lever 18 is configured to be substantially W-shaped in a plan view by bending a rod-shaped member to match the shape of the rear part of the handle 17. The traveling clutch lever 18 is disposed in the rear part of the handle 17 near a part that is gripped by an operator when traveling or mowing. The traveling clutch lever 18 is configured to span from the left part to the right part of the handle 17. The traveling clutch lever 18 is provided on the handle 17 so as to be rotatable up and down with its front end part as a pivot point. The traveling clutch lever 18 is configured to be biased upward. When the traveling clutch lever 18 is positioned upward, the traveling clutch lever 18 is in an OFF state, and the traveling of the hammer mower 1 is stopped. When the traveling clutch lever 18 is rotated downward to be positioned downward, the traveling clutch lever 18 is in an ON state, and the hammer mower 1 travels.

[0041] The back handle 21 is located in the center between the left and right of the rear of the handle 17. The back handle 21 is operated when the lever is in the ON state to switch the hammer mower 1 between forward and reverse, and is configured to be OFF when the operator is not gripping the back handle 21 and ON when the operator is gripping the back handle 21. When the travel lever is in the ON state, the hammer mower 1 is configured to travel forward when the back handle 21 is in the OFF state (when the back handle 21 is not gripped) and to travel backward when the back handle 21 is in the ON state (when the back handle 21 is gripped).

[0042] As described above, the hammer mower 1 is provided with the reverse handle 21 which is operated with the traveling clutch lever 18 in the ON state to switch between forward and reverse travel, and the reverse handle 21 is located on the handle 17 (in the center of the left and right rear of the handle 17). Therefore, compared to the conventional configuration (in which, when it is desired to travel in reverse, the traveling operation is stopped, the gear handle is used to switch to reverse gear, and the traveling clutch lever 18 is then turned ON to travel in reverse), it is possible to smoothly switch from forward to reverse travel, thereby improving operability and workability, etc. The rear handle 21 is not limited to being disposed in the center of the left and right rear part of the handle 17, but can be disposed in any suitable position on the handle 17 depending on the specifications, etc.

[0043] The traveling clutch lever 18 is configured so that the central left-right portion (corresponding to the portion where the back handle 21 is disposed) is concave, and the operator's hand can be placed in the concave portion. This configuration allows the operator to rotate the traveling clutch lever 18 up and down (to turn traveling on and off) while operating the back handle 21, improving operability and workability.

[0044] As shown in Figs. 20 and 21, a height adjustment mechanism 60 is provided for adjusting the height of the work implement 3 (cutter blade 31) to be higher or lower relative to the field. The height adjustment mechanism 60 is configured so that the front wheels 9 are rotatable around the axis of the cutter rotation shaft 30, and is configured to adjust the height of the work machine 3 by changing the rotational position of the front wheels 9 to change the height position of the front wheels 9 and fixing the changed height position of the front wheels 9 to raise or lower the height of the work machine 3. The height adjustment mechanism 60 includes a rotating portion 61 and an operating portion 62 .

[0045] The rotating part 61 of the height adjustment mechanism 60 supports the front wheel 9 near the side of the cutter cover 40, and is configured to be rotatable about the axis of the cutter rotation shaft 30. The rotating part 61 supports the front wheel 9 so as to be located forward of the cutter rotation shaft 30. The operating unit 62 is operated by an operator when adjusting the height of the working machine 3. The operating unit 62 is configured so that, when operated by an operator, it rotates the rotating unit 61 to change the height position of the front wheels 9, and also fixes the rotation position of the rotating unit 61 (the changed height position of the front wheels 9). The operating unit 62 is disposed above the cutter cover 40 on the right side of the machine body, and is disposed rearward of the cutter rotation shaft 30 (on the opposite side to the front wheels 9 across the cutter rotation shaft 30). The operating unit 62 is disposed to the right of the transmission case 4, in front of the engine 6, above and in front of the left running wheel 8, and in the space above (upper rear of) the cutter cover 40.

[0046] In this way, the front wheels 9 are positioned near the side of the cutter cover 30, and the operating part 62 of the height adjustment mechanism 60 is positioned above the cutter cover 30, so that the front wheels 9 do not protrude forward of the cutter cover 30, and the operating part 62 of the height adjustment mechanism 60 does not protrude forward or to the side of the machine body. Therefore, even though the machine has the function of changing the height position of the work implement 3 (cutter blade 31), the machine body can be prevented from becoming large and can be configured compactly, making it relatively easy to mow grass in narrow spaces or around the edges of fields, for example. Furthermore, since the operating unit 62 of the height adjustment mechanism 60 is positioned in the space to the right of the transmission case 4, in front of the engine 6, in front and above the left running wheel 8, and above (above and behind) the cutter cover 40, by positioning the operating unit 62 in a conventional space, even though it has the function of changing the height position of the work machine 3 (cutter blade 31), the machine can be configured compactly without increasing in size. In this manner, the rotating part 61 supports the front wheel 9 near the side of the cutter cover 30 and is configured to be rotatable around the axis of the cutter rotation shaft 30, and the operating part 62 is operated by an operator to rotate the rotating part 61 to change the height position of the front wheel 9. Also, since the rotation position of the rotating part 61 is fixed, the task of changing the height position of the work machine 3 (cutter blade 31) can be made easier.

[0047] The rotating portion 61 of the height adjustment mechanism 60 includes a pair of left and right support members 63 , 63 , and a connecting member 64 .

[0048] A pair of left and right support members 63, 63 of the rotating part 61 of the height adjustment mechanism 60 are supported by left and right bearings 43, respectively, and are configured to be rotatable around the axis of the cutter rotation shaft 30. The support member 63 is a flat metal member and is arranged outside the side plate 42 of the cutter cover 40 so as to be inclined front-lower-rear-upper. The lower part (front lower end) of the support member 63 is located near the lower end of the side plate 42 of the cutter cover 40, and the upper part (rear upper end) of the support member 63 is located near the lower end of the side plate 42 of the cutter cover 40. A through hole is formed in the lower part (front lower end), and the rotating shaft of the front wheel 9 is inserted into the through hole, so that the support member 63 supports the front wheel 9 at one end (lower part). The upper part (rear upper end) of the support member 63 is fixed to the connecting member 64, and the other end (upper part) of the support member 63 is connected to the connecting member 64.

[0049] The connecting member 64 of the rotating part 61 of the height adjustment mechanism 60 is a metal flat bar-shaped member with the longitudinal direction being the left-right direction, and is configured so that the left and right ends each protrude downward (in the front-down direction). The connecting member 64 is formed with a pair of protrusions 65, 65 protruding upward (in the rear-upward direction) on the left part of the middle part (upper part) of the left and right sides. The protrusions 65 of the connecting member 64 rotatably support an arm 66 of the operating part 62, which will be described later. The connecting member 64 is disposed so that its left and right middle parts (upper parts) are located above the main plate 41 of the cutter cover 40, and its left and right end parts are located outside the side plates 42 of the cutter cover 40. The connecting member 64 is disposed on the opposite side of the front wheel 9 with respect to the cutter rotation shaft 30. The connecting member 64 is fixed at its left and right ends to the upper parts of the pair of left and right support members 63,63 by fasteners such as bolts, thereby connecting the pair of support members 63,63.

[0050] The rotating unit 61 thus configured is configured so that the rotational position of the front wheels 9 and the rotational position of the connecting member 64 are changed by the support member 63 rotating about the axis of the cutter rotation shaft 30. The rotating unit 61 is configured so that when the front wheels 9 rotate upward by the support member 63 rotating, the connecting member 64 rotates downward, and when the front wheels 9 rotate downward, the connecting member 64 rotates upward. Then, by setting the rotational position of the front wheels 9 to the upward position (the rotational position of the connecting member 64 to the downward position), the cutter rotation shaft 30 moves so as to be pushed downward, and the working machine 3 (cutter blade 31) approaches the field, and the height of the working machine 3 (cutter blade 31) is lowered (see FIG. 23 or FIG. 24). In addition, by setting the rotation position of the front wheels 9 downward (the rotation position of the connecting member 64 upward), the cutter rotation shaft 30 moves in a pushed-up manner, and the working implement 3 (cutter blade 31) moves away from the field, increasing the height of the working implement 3 (cutter blade 31) (see Figure 25 or Figure 26).

[0051] The operating portion 62 of the height adjustment mechanism 60 includes an arm 66, an operating handle 67, a shaft 68, a cylindrical body 69, a support 70, a pair of upper and lower spring receivers 71, 71, a biasing member 72, an insert 73, and a plurality of notches 74.

[0052] The shaft 68 of the operating unit 62 of the height adjustment mechanism 60 is provided so as to cross a pair of left and right protrusions 65, 65 of the connecting member 64 of the rotating unit 61. The arm 66 of the operating unit 62 is a metal flat bar-shaped member with the left-right direction as the longitudinal direction, and is configured so that the right part protrudes upward and is configured to be substantially L-shaped in a front view. An operating handle 67 is provided on the upward protruding part of the arm 66 of the operating unit 62. The cylinder 69 of the operating unit 62 is fixed to the upper surface of the bent part of the arm 66 when it protrudes upward. The shaft 68 is inserted into the cylinder 69 of the operating unit 62, and the arm 66 is configured to be rotatable up and down.

[0053] A through hole is formed between the bent portion and the left end portion of the arm 66 of the operating portion 62 of the height adjustment mechanism 60 (the left portion of the arm 66). The support 70 of the operating unit 62 is fixed to the upper surface of the connecting member 64 so as to extend upward from the upper surface of the connecting member 64 while being inserted into the through hole of the arm 66. The spring receiver 71 of the operating unit 62 is a flat disk-shaped metal member with a through hole formed in the center. The upper spring receiver 71 of the operating unit 62 is fixed to the upper end of the support 70 with the support 70 inserted into the through hole. The lower spring receiver 71 is fixed to the upper surface of the arm 66 with the support 70 inserted into the through hole. The biasing member 72 of the operation portion 62 is formed of a coil spring. The biasing member 72 is disposed between a pair of spring receivers 71, 71, and biases the spring receiver 71, thereby biasing the left portion of the arm 66 downward. The insert 73 of the operation unit 62 is a flat disk-shaped metallic member, and is fixed to the left end of the arm 66 so as to protrude downward from the lower surface of the arm 66. The insert 73 is configured so as to be able to be inserted into the notch 74.

[0054] The notch 74 of the operating portion 62 of the height adjustment mechanism 60 is formed in the mounting plate 32 and is disposed above the main plate 41 of the cutter cover 40 . Here, the mounting plate 32 is formed by bending a flat metal member, and is configured to be roughly U-shaped when viewed from the side. The front and rear ends of the mounting plate 32 are fixed to the main plate 41 of the cutter cover 40 by fasteners such as bolts, and are positioned above the cutter cover 40. Furthermore, a pair of left and right connecting plates 33, 33 are connected to the upper surface of the mounting plate 32 so as to protrude upward, and an upper portion of the connecting plate 33 is fixed to the transmission case 4 with fasteners such as bolts, and the cutter cover 40 is provided on the transmission case 4 via the mounting plate 32 and the connecting plate 33. The portion where the connecting plate 33 is connected to the mounting plate 32 is located slightly inside the left and right ends of the mounting plate 32, and is configured so that the left and right edges protrude to the left or right. The notch 74 of the operating portion 62 is configured to cut out a right edge portion of the midway portion between the front and rear of the mounting plate 32. The notch 74 is configured to be able to insert the fitting insert 73. A plurality of notches 74 (six in this embodiment) are formed at predetermined intervals in the front-rear direction, and an operator is configured to select one of the plurality of notches 74 to insert the fitting insert 73 into.

[0055] Next, the operation of adjusting the height of the work implement 3 (cutter blade 31) in the height adjustment mechanism 60 will be described. When the insert 73 is inserted into one of the multiple notches 74 of the operating part 62 of the height adjustment mechanism 60 selected by the operator, the rotational positions of the support member 63, connecting member 64, and front wheel 9 of the rotating part 61 are fixed (see Figure 21 or Figure 22). In this state, the operator rotates the operating handle 67 of the operating unit 62 downward (to the lower right) to rotate the arm 66, thereby pulling the insert 73 upward and out of the notch 74 (see Figure 27 or Figure 28). Then, with the insert 73 pulled upward and removed from the notch 74 of the operating part 62, the operator moves the operating handle 67 of the operating part 62 forward (upward and forward) or backward (downward and rearward) to change the rotational position of the connecting member 64 and the rotational position of the front wheels 9, thereby adjusting the height of the working machine 3 (cutter blade 31). Furthermore, with the rotational position of the connecting member 64 and the rotational position of the front wheel 9 changed, the support member 63 of the rotating part 61, the connecting member 64, and the front wheel 9 are fixed in a state in which the insert 73 is inserted into one notch 74 selected by the operator from among the plurality of notches 74, and the height of the working machine 3 (cutter blade 31) is fixed. When the operator releases the operation handle 67 of the operation part 62, the left part of the arm 66 is urged downward by the urging force of the urging member 72, and the state in which the insert 73 is inserted into the notch 74 is maintained.

[0056] The number of notches 74 in the operating portion 62 of the height adjustment mechanism 60 is not limited to six, and the number can be set appropriately depending on the specifications, applications, etc. In addition, the operating unit 62 is not limited to being disposed on the right side of the aircraft body, but may also be configured to be disposed on the left side of the aircraft body.

[0057] As described above, the support member 63 of the rotating part 61 of the height adjustment mechanism 60 is supported by the bearing 43 and is configured to be rotatable around the axis of the cutter rotation shaft 30, supports the front wheel 9 at one end, and is connected to the connecting member 64 at the other end (upper part).By rotating the support member 63 around the axis of the cutter rotation shaft 30, the rotational position of the front wheel 9 and the rotational position of the connecting member 64 can be changed, so that a simple configuration can be used to make it easier to change the height position of the work machine 3 (cutter blade 31).

[0058] As described above, when the insert 73 is inserted into one of the multiple notches 74 of the operating part 62 of the height adjustment mechanism 60 selected by the operator, the rotation positions of the support member 63, connecting member 64, and front wheel 9 of the rotating part 61 are fixed, and the operating handle 67 is operated to rotate the arm 66 and pull the insert 73 out of the notch 74.The operator can then operate the operating handle 67 of the operating part 62 to move it, thereby changing the rotation position of the connecting member 64 and the rotation position of the front wheel 9 to adjust the height of the work machine 3 (cutter blade 31).This makes it possible to simplify the task of changing the height position of the work machine 3 (cutter blade 31) with a simple configuration.

[0059] As shown in FIGS. 1 and 2 or 4 to 8, the hammer mower 1 includes an anti-rebound plate 35. The bounce prevention plate 35 prevents stones and the like that bounce forward when the work machine 3 is performing grass cutting work from hitting a wall or the like and bouncing back and coming into contact with the worker. The anti-bounce plate 35 is formed by bending a flat metal member. The anti-bounce plate 35 has a lower portion 36 extending in the vertical direction and an upper portion 37 formed so as to be inclined front-upper, rear-lower, and downward, and is configured to be substantially V-shaped when viewed from the side. The bounce prevention plate 35 is provided at the front end of the cutter cover 40. The bounce prevention plate 35 is configured such that a lower portion 36 is attached to the front end of the main plate 41 of the cutter cover 40 by a fastener such as a screw, and an upper portion 37 extends forward and upward from the front end of the main plate 41 of the cutter cover 40. The lower portion 36 of the bounce prevention plate 35 is configured to prevent stones and the like that bounce back during the grass cutting operation of the working machine 3 from directly hitting the machine body, a worker, and the like. In addition, the upper portion 37 of the bounce prevention plate 35 is configured to prevent stones and the like that bounce back during the grass cutting operation of the working machine 3 from directly hitting the machine body, a worker, and the like, and to be able to push down grass forward just before it is cut by the working machine 3. The upper end portion of the upper portion 37 of the bounce prevention plate 35 is located at the front end of the machine body.

[0060] As described above, since the anti-bounce plate 35 is provided at the front end of the cutter cover 40, it is possible to more reliably prevent rebounded stones and the like from hitting the operator when the work machine 3 is performing grass cutting operations.

[0061] The anti-rebound plate 35 includes a pair of left and right side plate portions 38, 38. The side plate portions 38 of the bounce-back prevention plate 35 are configured to take in grass just before it is to be cut by the work machine 3 when the hammer mower 1 is traveling to perform grass cutting work. The pair of left and right side plate portions 38 of the bounce-back prevention plate 35 are connected to the lower portion 36 of the bounce-back prevention plate 35. The pair of left and right side plate portions 38 of the bounce-back prevention plate 35 are configured to extend leftward or rightward from the left and right ends of the lower portion 36 of the bounce-back prevention plate 35 and extend outward from the left and right of the cutter cover 40. The side plate portions 38 of the bounce-back prevention plate 35 are configured to incline outward, frontward, inward, and backward. By configuring the anti-bounce plate 35 (side plate portion 38 of the anti-bounce plate 35) in this manner, it is possible to integrally configure a device that has the function of preventing rebounded stones and the like from hitting the operator when the work machine 3 is performing grass-cutting work, as well as the function of collecting grass, thereby reducing the number of parts.

[0062] Further, the side plate portion 38 of the anti-rebound plate 35 is disposed in front of the front wheel 9 . Therefore, when the hammer mower 1 is traveling while performing grass cutting work, the cut grass can be prevented from getting entangled around the front wheel 9.

[0063] As shown in FIGS. 29 and 30, the anti-bounce plate 35 may be configured to have a travel guide 39 on an upper portion 37 thereof. When the hammer mower 1 is driven by an operator holding the handle 17, the travel guide 39 of the bounce prevention plate 35 generally stabilizes the travel path of the hammer mower 1 by driving the hammer mower 1 so that the travel guide 39 is aligned with a specified object in the field as seen by the operator. The travel guide 39 of the anti-rebound plate 35 is disposed in a position visible to an operator when the operator is gripping the handle 17. The travel guide 39 of the anti-rebound plate 35 is provided at the upper end of the upper part 37 (the front end of the machine body). The travel guide 39 of the anti-rebound plate 35 is disposed near each of the left and right ends of the upper part 37. The travel guide 39 of the anti-rebound plate 35 is disposed closer to the center than the side plate portion 38. The travel guide 39 of the anti-rebound plate 35 is configured such that the upper end of the upper part 37 is cut out in an arc shape. Because of this configuration, for example, by running the hammer mower 1 so that the boundary (a specified object) between the mowed area and the unmowed area is aligned with the travel guide 39 of the anti-bounce plate 35 as seen by the operator, the travel path of the hammer mower 1 can be roughly stabilized, and grass can be prevented from being left uncut at the boundary between the mowed area and the unmowed area when mowing work is performed with the work machine 3. In addition, the running guide 39 of the anti-bounce plate 35 is not limited to being an arc-shaped notch, but can be composed of, for example, an angular notch or a protrusion, or can be composed of a triangular mark on the rear upper surface of the upper portion 37.

[0064] As shown in Figures 31 and 32, the cutter cover 40 includes a protective plate 48. The protective plate 48 is made of a flat metal member. The protective plate 48 is disposed inside the cutter cover 40 to prevent stones, grass, etc., kicked up when the working machine 3 performs a grass-cutting operation, from directly contacting the cutter cover 40 (the inside of the cutter cover 40). The protective plate 48 is disposed inside the front part of the main plate 41 of the cutter cover 40 (a part where a relatively large amount of stones, etc., are kicked up when the working machine 3 performs a grass-cutting operation).

[0065] As described above, the cutter cover 40 includes the protective plate 48 that prevents stones and the like kicked up when the working machine 3 performs a grass cutting operation from directly contacting the cutter cover 40, and therefore it is possible to prevent the cutter cover 41 from being damaged (for example, the occurrence of dents, etc.) due to contact with kicked up stones and the like. This reduces the frequency of replacement of the cutter cover 40 due to damage, and reduces the cost of replacing the cutter cover 40.

[0066] Furthermore, since the cutter cover 40 includes the protective plate 48, the strength of the cutter cover 40 itself can be reduced by making the plate thickness of the cutter cover 40 thinner than that of a cutter cover not including the protective plate 48. When the plate thickness of the cutter cover 40 is made thinner in this manner, the weight of the cutter cover 40 can be reduced, and the operability of the hammer mower 1 during turning, etc. can be improved. Also, the thickness of the protective plate 48 of the cutter cover 40 can be increased to increase the weight of the cutter cover 40. When the protective plate 48 is configured to be thick in this way, the protective plate 48 can also function as a weight.

[0067] The protective plate 48 is attached to the cutter cover 40 (the main plate 41 of the cutter cover 40) by fasteners such as screws, and is configured to be detachable. By configuring it in this manner, a damaged protective plate 48 can be easily replaced. Moreover, the protective plate 48 is provided on the cutter cover 40 via a spacer 49. The protective plate 48 is provided on the cutter cover 40 so that a slight gap (e.g., a gap of 5 mm) is provided between the protective plate 48 (the front upper surface of the protective plate 48) and the main plate 41 (the rear lower surface of the main plate 41) of the cutter cover 40. With this configuration, even if a dent or the like is caused in the protective plate 48 by stones or the like kicked up when the working machine 3 performs a grass cutting operation, it is possible to prevent the main plate 41 of the cutter cover 40 from being damaged by the dent or the like in the protective plate 48.

[0068] As shown in FIGS. 33 and 34, the belt cover 11 includes a belt tension mechanism 80. As shown in FIG. The belt tension mechanism 80 of the belt cover 11 is configured to apply tension to the belt 16 placed inside the belt cover 11 and to absorb shocks to the belt 16 and vibrations of the belt 16. The belt tension mechanism 80 applies tension to the belt 16 by biasing the rear part of the belt 16 between the pulley 14 (power take-off shaft) and the pulley 15 (cutter rotation shaft 30) inside the belt cover 11 forward. The belt tension mechanism 80 is attached to the attachment portion of the belt cover 11. The attachment portion of the belt cover 11 is configured in a cylindrical shape and protrudes rearward from its rear portion, approximately in the vertical center. The belt tension mechanism 80 is attached by being fitted into the attachment portion of the belt cover 11. Note that the belt tension mechanism 80 (attachment portion of the belt cover 11) is not limited to being disposed approximately in the vertical center of the rear portion of the belt cover 11, and can be disposed at an appropriate position on the belt cover 11 depending on the specifications, etc. The belt tension mechanism 80 includes a case 81, a cap 82, a moving arm 83, a biasing spring 84, a support shaft 85, a pair of left and right bearings 86, and a pair of left and right belt guides 87.

[0069] The case 81 of the belt tension mechanism 80 is configured in a cylindrical shape. The case 81 is fitted into the mounting portion of the belt cover 11 and fixed thereto. The cap 82 of the belt tension mechanism 80 is detachably attached to the attachment portion of the belt cover 11 so as to cover the opening at the rear end of the attachment portion of the belt cover 11 .

[0070] The moving arm 83 of the belt tension mechanism 80 is configured as a flat metal plate with the longitudinal direction being the front-rear direction. The moving arm 83 is arranged inside the case 81 and configured to be movable along the axial direction of the case 81 (approximately the front-rear direction). The moving arm 83 is arranged so that its rear part is arranged inside the case 81 and its front part protrudes from the front opening of the case 81. The moving arm 83 has a through hole 89 in its front part through which the support shaft 85 is inserted, and is formed so as to be angular at its front-rear midpoint. The angular part of the moving arm 83 is configured as a spring receiver 88 with which the front end of the biasing spring 84 abuts. The biasing spring 84 of the belt tension mechanism 80 is a coil spring, and is disposed inside the case 81. The biasing spring 84 has a rear end supported by a spring support disposed at the rear of the case 81, and a front end abutting against a spring receiver 88 of the moving arm 83, thereby biasing the moving arm 83 forward (towards the belt 16).

[0071] The support shaft 85 of the belt tension mechanism 80 is a cylindrical member that is inserted into a through hole 89 in the moving arm 83 and configured to protrude to the left and right from the moving arm 83. The support shaft 85 is configured to support a bearing 86 and a belt guide 87. The bearing 86 of the belt tension mechanism 80 is configured to be rotatable while in contact with the belt 16. The pair of bearings 86, 86 are inserted through support shafts 85 on the left and right sides of the moving arm 83 to be rotatable, and are disposed on the left and right sides of the front part of the moving arm 83. The front end of the bearing 86 is located forward of the front end of the moving arm 83. The left-right width of the pair of bearings 86, 86 (the distance between the left end of the left bearing 86 and the right end of the right bearing 86) is configured to be slightly larger than the width of the belt 16.

[0072] The belt guide 87 of the belt tension mechanism 80 is configured to prevent the belt 16, which is in contact with the bearing 86, from falling off. The belt guide 87 is a flat metal member, and is configured to have a shape like a part of a circle cut out in a side view. The belt guide 87 has a through hole 89 in its approximate center, through which the support shaft 85 is inserted. The pair of belt guides 87, 87 are inserted through the support shaft 85 on the outer side (left or right) of the left and right bearings 86, and are disposed in front of the moving arm 83 and on the left and right of the bearing 86, respectively. A retaining ring is provided on the outer side of the belt guide 87 to prevent the belt guide 87 and the bearing 86 from falling off the support shaft 85. The interval between the pair of belt guides 87, 87 (the distance from the left belt guide 87 to the right belt guide 87) is configured to be slightly larger than the width of the belt 16. The belt 16 is configured to be disposed between the pair of belt guides 87, 87. The front portion (at least the front part) of the belt guide 87 is located forward of the front end portion of the bearing 86 .

[0073] The belt tension mechanism 80 configured in this manner applies tension to the belt 16 placed inside the belt cover 11 by abutting the pair of bearings 86, 86 against the belt 16 while the moving arm 83 is biased forward by the biasing spring 84, and is configured to absorb impacts to the belt 16, vibrations of the belt 16, etc.

[0074] As described above, the belt tension mechanism 80 is disposed in the case 81 and configured to be movable along the axial direction of the case 81, and includes the moving arm 83 having the through hole 89 through which the support shaft 85 is inserted, the biasing spring 84 that biases the moving arm 83 toward the belt 16, the support shaft 85 inserted in the through hole 89 of the moving arm 83 and configured to support the bearing 86 and the belt guide 87, and the bearing 86 inserted through the support shaft 85 and rotatable in contact with the belt 16. This allows the belt tension mechanism 80 to be thinner (thinner in the left-right direction) than the conventional belt tension mechanism 80 for the belt 16 in the belt cover. The left-right width of the belt cover can be configured to be, for example, 30 mm or less. This allows the hammer mower 1 to be configured to be relatively compact.

[0075] As described above, the belt tensioning mechanism 80 is provided with the belt guide 87 configured to prevent the belt 16 from falling off when in contact with the bearing 86, so that the bearing 86 can be more reliably brought into contact with the belt 16, and tension can be more reliably applied to the belt 16.

[0076] When the work clutch lever 19 is turned ON and the work machine 3 is performing a grass cutting operation, when the work clutch lever 19 is turned OFF, a brake device (not shown) is activated to stop the rotation of the pulley 14 and stop the transmission of power from the engine 6 to the work machine 3. When the work clutch lever 19 is in the OFF state, the brake device (not shown) brakes the pulley in the belt cover 10 provided on the power take-off shaft in the shaft cover 12 to stop the rotation of the pulley, thereby stopping the rotation of the pulley 14. Note that the configuration for stopping the rotation of the pulley 14 when the work clutch lever 19 is in the OFF state is not limited to the above, and for example, a configuration may be used in which the rotation of the pulley 14 is stopped by applying the brakes to the pulley 14 when the work clutch lever 19 is in the OFF state. In this manner, when the brake device (not shown) is activated and the rotation of the pulley 14 stops, tension is applied to the belt 16, and the moving arm 83 of the belt tensioning mechanism 80 is pushed back (moves in the opposite direction to the belt 16), so that the belt 16 is loosened and the pulley 15 can rotate freely relative to the belt 16. Furthermore, since the cutter rotating shaft 30 is rotating when the work machine 3 is performing grass cutting operation, the pulley 15 rotates freely relative to the belt 16 for a while even after the brake device (not shown) is activated and the rotation of the pulley 14 stops, and the cutter rotating shaft 30 and pulley 15 continue to rotate due to their inertia.

[0077] As described above, when the work clutch lever 19 is turned ON and the work machine 3 is performing a grass cutting operation, the rotation of the pulley 14 is stopped by turning the work clutch lever 19 to the OFF state. When the rotation of the pulley 14 stops, tension is applied to the belt 16, the moving arm 83 of the belt tension mechanism 80 is pushed back, and the belt 16 is loosened so that the pulley 15 can rotate freely relative to the belt 16. After the rotation of the pulley 14 stops, the pulley 15 rotates freely relative to the belt 16, and the cutter rotation shaft 30 and the pulley Since pulley 15 continues to rotate due to its inertia, the load on pulleys 14 / 15 and belt 16 can be reduced and damage to pulleys 14 / 15, belt 16, pulley 14's brake device (not shown), etc. can be suppressed compared to a configuration in which belt 16 does not slacken and pulley 15 does not spin freely relative to belt 16 when the work clutch lever 19 is turned ON and the work machine 3 is performing a grass cutting operation, and then the work clutch lever 19 is turned OFF to activate the brake device and stop the rotation of pulley 14. [Explanation of symbols]

[0078] 1 Hammermore 2 Running part 3. Work equipment 4. Transmission case 5 Engine frame 6 Engine 7 Traveling axis 8 Running Wheel 9 Front Wheel 11 Belt cover 14 Pulley 15 Pulley 16 Belt 17 Handle 18 Traveling clutch lever 21 Back Handle 22 Mounting hole 23 Wheels 24 Cylinder part 27 Projection 28 Through hole 29 Pin arrangement section 30 Cutter rotation axis 31 Cutter blade 35 Anti-rebound plate 36 Lower 37 Upper 38 Side plate part 39 Driving Guide 40 Cutter cover 41 Main plate 42 Side Panel 43 Bearings 44 Axis cover 45 Viewing window 47 Visibility Mark 48 Protective plate 49 Spacer 50 Contact member 54 Fixing pin 60 Height adjustment mechanism 61 Rotating part 62 Operation section 63 Support member 64 Connecting member 66 Arm 67 Operating Handle 73 Injection 74 Notch 80 Belt tension mechanism 84 Moving Arm 85 Spring 86 Bearing 87 Belt guide

Claims

1. A hammer mower having a working implement for mowing a field arranged at the front of the traveling part and capable of mowing the field while traveling, the traveling section includes a transmission case, an engine frame fixed to the transmission case, an engine mounted on the engine frame and serving as a power source for traveling and for a working machine, a traveling shaft that is mounted across the transmission case and driven by power transmitted from the engine, traveling wheels provided on the traveling shaft, a cutter cover that covers an upper part of the working machine, and a front wheel provided near the cutter cover; The working machine is configured such that a cutter rotation shaft driven by power transmitted from the engine is traversed within the cutter cover, and a plurality of cutter blades are provided on an outer circumferential surface of the cutter rotation shaft, a height adjustment mechanism for adjusting the height of the working machine by changing a height position of a front wheel and fixing the changed height position of the front wheel, thereby raising or lowering the height of the working machine, The front wheel is disposed near a side of the cutter cover, The height adjustment mechanism includes an operation unit that is operated by an operator when adjusting the height of the work machine, The operation portion of the height adjustment mechanism is disposed above the cutter cover, The height adjustment mechanism includes a rotating part, The rotating portion supports the front wheel near a side portion of the cutter cover and is configured to be rotatable around an axis of the cutter rotation shaft, The operating unit is configured to rotate the rotating unit to change the height position of the front wheels by being operated by an operator, and to fix the rotation position of the rotating unit. Hammermore.

2. The rotation portion of the height adjustment mechanism includes a pair of left and right support members that are arranged on the outer sides of the side plates of the cutter cover, The support member of the rotating portion is configured to be rotatable around an axis of the cutter rotation shaft, and supports a front wheel at one end thereof; The support member of the rotating part is configured to rotate around the axis of the cutter rotation shaft, so that the rotation position of the front wheel is changed.

2. The hammer mower of claim 1.

3. A bounce prevention plate is provided to prevent stones or the like that bounce forward during the grass cutting operation of the working machine from bouncing back and hitting the worker, The anti-rebound plate is provided at the front end of the cutter cover. A hammer mower according to claim 1 or claim 2.

4. The hammer mower has a handle that is held by an operator during travel or mowing, The anti-rebound plate is provided with a running guide, When an operator is gripping the handle and causing the hammer mower to travel, the hammer mower is caused to travel so that the travel guide of the bounce prevention plate coincides with a predetermined object in the field as seen by the operator, thereby stabilizing the travel path of the hammer mower.

4. The hammer mower of claim 3.

5. The cutter cover is provided with a protective plate disposed inside the cutter cover to prevent stones, grass, etc., kicked up when the working machine performs a grass cutting operation, from directly contacting the cutter cover. A hammer mower according to any one of claims 1 to 4.

6. a belt cover and a power take-off shaft to which power from the engine is transmitted, The power take-off shaft is inserted into the belt cover, and a pulley is provided in the belt cover. The cutter rotation shaft is inserted into the belt cover, and a pulley is provided in the belt cover. A belt is wound between the pulley of the power take-off shaft and the pulley of the cutter rotation shaft in the belt cover, so that power from the engine is transmitted to the cutter rotation shaft, a belt tensioning mechanism configured to apply tension to the belt disposed within the belt cover and to absorb shocks to the belt, vibrations of the belt, and the like; The belt tensioning mechanism includes: a case fixed to the belt cover; a moving arm disposed within the case and configured to be movable along an axial direction of the case, the moving arm having a through hole; A biasing spring that biases the moving arm toward the belt; A support shaft that is inserted into the through hole of the moving arm; A bearing is inserted into the support shaft and is rotatable in contact with the belt. A hammer mower according to any one of claims 1 to 5.

Images