JP4929909B2 - Tractor mower transmission - Google Patents

Description

  The present invention relates to a transmission device in which a height of a mower deck is configured to be low in a tractor mower in which a mower deck is mounted on a front portion, an abdominal portion, or the like of a tractor.

In the tractor mower (mid mower) attached to the abdomen of the tractor, a gear case for bearing the input shaft is provided on the center front part of the mower deck, and an interlocking shaft is provided between the gear case and the gear case for bearing the rear blade shaft. (See, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-237218 (page 4, FIG. 2).

  In the case of the tractor mower, when the input shaft for transmitting the blade shaft, the bearing metal, the gear case, etc. are provided on the upper side of the mower deck, the height (thickness) of the mower deck is increased, and the tractor body Even when the elevation height interval with respect to the bottom portion is limited to be small and the climbing state is not enough, the ascending stroke (lifting height) cannot be sufficiently formed, so that the mower deck is liable to contact the uneven ground or the like and is easily damaged.

According to the first aspect of the present invention, the gear cases 3 and 4 for bearing the upper end portions of the pair of left and right blade shafts 1 and 2 are arranged on the upper side of the mower deck 5, and the input interlocking shaft 6 for bearing on the gear case 3 on one side thereof. The front end of the motor deck 5 is supported by a bearing metal 7 on the front end of the mower deck 5, and a pulley 8 is attached to the front of the mower deck 5. A pulley 8 is attached to the pulley 8, and an input shaft 9 is supported on the central front side of the width of the mower deck 5. A belt 11 is stretched between the pulley 10 and the gear case 3 on the input side, and a blade bevel gear 13 at the upper end of the blade shaft 1 is connected to the input bevel gear 12 at the rear end of the input interlocking shaft 6. , tractor, characterized by transmitting the blade interlocking shaft 14 interlocking edge bevel gear 15 to the bearing over between the left and right gear case 3 and 4 is meshed The structure of chromatography A gearing.
When the input shaft 9 is transmitted from the PTO shaft on the tractor vehicle body side, the input interlocking shaft 6 on one side of the mower deck 5 and the pulley 8 are transmitted and rotated from the input shaft 9 via the belt 11 to each gear case 3, 4. The blade shafts 1 and 2 are rotated. In such a transmission mechanism, the front input shaft 9 is positioned at the center front side portion of the mower deck 5, and the pulley 10 protrudes to the front side of the mower deck 5 by the bearing by the bearing metal 7 of the side input shaft 6. Since the input shaft 9 at the center of the mower deck 5, the input interlocking shaft 6 at the side, and the belt 11 spanned between them are set low, the elevation height of the mower deck 5 is increased. maintain.

Further, the input interlocking shaft 6 transmitted from the input shaft 9 to the belt 11 transmits and rotates the blade shaft 1 on one side via the input bevel gear 12 and the blade bevel gear 13 of the gear case 3, and meshes with the input bevel gear 12. The blade shaft 2 of the gear case 4 on the other side is rotated through the interlocking bevel gear 15 and the blade interlocking shaft 14. Since the blade bevel gear 13 on the blade shaft 1 supported by the gear case 3 and the interlocking bevel gear 15 of the blade interlocking shaft 14 are directly meshed with the input bevel gear 12 of the input interlocking shaft 6, the input interlocking shaft 6, The set heights of the gear case 3, the blade interlocking shaft 14, and the like can be lowered.

  According to the first aspect of the present invention, the input shaft 9 located at the center front portion of the mower deck 5 and the pulley 8 of the input interlocking shaft 6 interlocked from the input shaft 9 via the belt 11 are arranged on the front side of the mower deck 5. Thus, the height of the input shaft 9, the boom 8, the belt 11 and the like on the mower deck 5 can be lowered, and the height of the tractor vehicle body can be kept high.

Further, since the blade bevel gear 13 on the blade shaft 1 and the interlocking bevel gear 15 of the blade interlocking shaft 14 are directly meshed with the input bevel gear 12 of the input interlocking shaft 6 in the gear case 3 on the mower deck 5, these gear case 3 and The installation height of the input interlocking shaft 6 and the blade interlocking shaft 14 can be reduced, the transmission configuration can be simplified, and the elevation height relative to the tractor vehicle body can be maintained high.

  Based on the illustrated example, the tractor mower has a mid mower configuration in which the mower deck 5 is mounted on the abdomen of the vehicle body 16, a collector 17 is attached to the rear portion of the vehicle body 16, and a discharge port 18 formed at the center rear portion of the mower deck 5 through a shooter 19. The collector 17 is connected to collect the cut turf grass. The tractor is equipped with an engine 20 at the front, and a front wheel 22 steered by a steering handle 21 in front of the driver's seat 24 and a rear wheel 23 are arranged. The configuration of the form. The moor deck 5 is suspended and mounted on the abdomen of the vehicle body 16 by front and rear parallel lift links 25 and 26, and can be moved up and down via a lift rod 27 connected to a lift arm at the rear of the vehicle body 16. The input shaft 9 provided on the front side of the moor deck 5 is connected to a front PTO shaft 28 provided on the bottom of the front end of the vehicle body 16 via an interlocking shaft 29. The interlocking shaft 29 is extendable and interlocked via a universal joint so that it can be transmitted even if the mower deck 5 moves up and down.

  The mower deck 5 has a pair of left and right blade shafts 1 and 2 and can rotate the blade 30 to cut grass. An input shaft 9 is provided at the center front side in the width direction of the mower deck 5 to connect the front PTO shaft 28, and a discharge port 18 for discharging the cut grass is formed at the center rear side to connect the shooter 19. In addition, gauge wheels 31, 32, 33 are arranged before and after the moor deck 5. A center gauge wheel 31 is attached below the input shaft 9 at the front center part, and a side gauge wheel 32 is attached to the left and right outer parts. A side gauge wheel 33 is attached to the rear side. The mower deck 5 has a bearing boss 34 for bearing each of the blade shafts 1 and 2 in the central portion, and the outer peripheral portion is sequentially bulged upward to form a collecting cylinder 35. The left and right collecting cylinders 35 are configured to be integrally connected to each other, and the left and right collecting cylinders 35 are arranged at the 18 outlets so that the turf grass cut by the left and right blades 30 is collected and discharged from the center toward the rear outlet 18. It is configured to join together. Gear cases 3 and 4 are attached to the upper side of the bearing bosses 34 so that the blade shafts 1 and 2 are interlocked by bevel gears. Among them, the left gear case 3 where the input interlocking shaft 6 of the mower deck 5 is located has a rear end portion of the input shaft 6 and has an input bevel gear 12. The input bevel gear 12 is placed on the lower side of the blade shaft 1. And the interlocking bevel gear 15 of the blade interlocking shaft 14 are meshed on the lateral side. Further, the right gear case 4 receives the right end portion of the blade interlocking shaft 14 which is supported between the gear case 3 and the right bevel gear 15 of the blade interlocking shaft 14 and the bevel gear 13 at the upper end of the blade shaft 2 are engaged with each other. Let

  On the mower deck 5, a bearing metal 7 for bearing the front end portion of the input interlocking shaft 6 is provided on the rear end edge portion of the mower deck 5, and the front end of the input interlocking shaft 6 is the front deck surface of the mower deck 5. The pulley 8 is attached so as to protrude forward from 34. At this time, the pulley 8 is positioned in front of the front deck surface 34 and is set as low as possible, so that the belt 11 wound around the pulley 8 is unlikely to interfere with rotation or rotation. In particular, in the form in which the lower end edge of the pulley 8 is positioned below the upper surface of the mower deck 5 as shown in FIG. 6, the protruding heights of the belt 11, the pulley 8, the input interlocking shaft 6 and the like can be set lower. .

  Further, the center front side portion of the mower deck 5 forms a delta-shaped deck spacing portion 36 as a left and right deck connecting portion, and the gauge wheel 31 and the input shaft 9 are attached to the deck spacing portion 36. The wheel bracket 38 of the gauge wheel 31 is attached to the lower surface of the connecting base 37 that is integrally attached across the front deck surfaces 34 on both the left and right sides of the deck spacing portion 36 by tightening the bolts 38 with bolts 39. An input bearing boss 40 for bearing the input shaft 9 is integrally formed on the upper surface of the connection base 37. A gauge wheel 31 is pivotally supported on the wheel bracket 38 by a wheel shaft 41. Further, link pins 42 are provided on both the left and right sides of the connection base 37 to connect the rear ends of the lift links 25. A tension arm 44 of a tension pulley 43 that tensions the belt 11 is provided at the front end of the connection base 37 so as to be rotatable up and down around the arm shaft 45 and is tensioned toward the belt 11 by a spring 46. Yes. A V-belt 11 is stretched between the pulley 10 of the input shaft 9 and the pulley 8 at the front end of the input interlocking shaft 6 and is tensioned by the tension pulley 43 to be in a transmission state.

  Due to the rotation of the PTO shaft 28, the input shaft 9 is rotated via the interlocking shaft 29, and the left input interlocking shaft 6 is rotated from the input shaft 9 via the belt 11. As the input interlocking shaft 6 rotates, the blade bevel gear 13 meshing with the input bevel gear 12 and the interlocking bevel gear 15 are rotated to rotate the blade shaft 1 and the blade interlocking shaft 14. Further, it is rotationally transmitted via the blade interlocking shaft 14 via the bevel gears 12 and 13 in the right blade shaft 2 gear case 4. Turf grass mowed by the blade 30 by the rotation of the blade shafts 1 and 2 is collected along the collecting cylinder 35 at the center of the moor deck 5 and sent to the rear discharge port 18. When the mowing ground changes unevenly, the mower deck 5 moves up and down by the grounding rotation of the gauge wheels 31, 32, and 33 to maintain the mowing height of the turf grass at a constant level, and the lift link 25 by the up and down rotation of the lift arm. Can be moved up and down to raise the mower deck 5 to a non-cutting position, or moved down to a cutting position. When the mower deck 5 is raised, the upper surface of the mower deck 5 approaches the lower surface of the abdomen of the tractor vehicle body 16, but the pulley 10 of the input shaft 9 protruding from the upper surface of the mower deck 5 and the pulley 8 on the input interlocking shaft 6. Since the installation height of the belt 11 and the gear cases 3 and 4 on the blade shafts 1 and 2 can be reduced, the height of the entire moor deck 5 including these parts can be reduced. Thus, the distance from the lower surface of the upper tractor vehicle body 16 can be maintained high, and the lift of the mower deck 5 can be increased.

  The collector 17 communicates with the shooter 19 on the front side and has an open / close lid 47 on the rear side. The rear frame 48 of the vehicle body 16 is provided so as to be able to fall backward via a fall cylinder 49. When the stored turf grass is full, the fall cylinder 49 rotates the collector 17 rearward to open the open / close lid 47. The contained turf can be discharged. Further, a bottom plate 51 that can be swung up and down by a cylinder 50 is provided inside the collector 17. When the bottom plate 51 is rotated to the bottom, turfgrass can be accommodated in the collector 17, and when it is rotated upward, the bottom 52. The turfgrass carried from the shooter 19 can be released and guided to the cut ground.

  Next, mainly based on FIG. 9, the side cover 60 which can be opened and closed is provided in the left and right side openings 61 of the collector 17. The side cover 60 is made of a sheet-like fabric and can be closed with a fastener or the like. In addition, the opening 61 is provided with a ventilated net 62 and exhausted without passing through the turf grass to reduce grass resistance. However, the side cover 60 is closed to the outside and the opening 61 is closed. It can be closed.

  Next, mainly based on FIGS. 10 and 11, the rear end of the shooter 19 is connected to the blower 65 as a form of a front mower in which the mower deck 5 is mounted on the front side of the tractor vehicle body 16, and is collected to the collector. In this configuration, an opening 66 is formed above the front end of the collecting cylinder 35 or the shooter 19, and a switching valve 67 that opens and closes the opening 66 and the lower discharge port 18 is pivotally supported 69. The lever 68 can be operated. Turf grass is likely to be clogged in the discharge port 18 and the shooter 19 of the mower deck 5. In such a case, the switching valve 67 is rotated to the lower discharge port 18 side to close the discharge port 18 and open 66. In the open state, the outside air is sucked from the opening 66 by the suction force of the blower 65 and ventilated, so that the clogging of the turf grass at the discharge port 18 and the shooter 19 can be eliminated. 68 is a front axle housing for mounting the front wheel 22, the front PTO shaft 28 is provided in a part of the housing 68, and the input shaft 9 interlocked via the interlocking shaft 29 is provided in the right gear case 4 part. The mower deck 5 is configured to be interlocked from the rear side. 69 is a step floor.

  Next, mainly based on FIG. 12, a shooter 19 provided inexpensively between the discharge port 18 of the mower deck 5 and the suction port of the blower 65 is formed in a cylindrical shape, and a spiral 71 is formed on the inner peripheral surface. It is configured to be able to rotate in conjunction with the winding of the belt 74 by a recoil motor 73 that rotates by turning on and off by operating the lever 72. By rotating the shooter 19, the grass 71 being collected can be forcibly conveyed by the spiral 71 to eliminate clogging.

  Next, mainly based on the fan 76 shaft 77 of the blower 65, the blower 65, the shooter 19 and the like are integrally moved up and down to rotate the mower deck 5 mainly based on FIG. It reduces movement and simplifies the configuration. The fan shaft 77 of the blower 65 is set in the horizontal direction, the shooter 19 side of the blower 65 is provided so as to rotate up and down integrally with the mower deck 5, and the discharge cylinder 78 communicating with the collector side is provided on the machine body side. Fix it.

  Next, based mainly on FIGS. 12, 14, 15, and 16, in the engine 20 mounted on the rear portion of the tractor vehicle body 16, an oil cooler 80 that cools engine oil is attached to a side net 81 in the front of the engine room. It is made into the form which is hard to receive a cooling fall in the position which is provided in the vicinity of and is hard to produce clogging by the adsorption | suction of the cutting turf grass. The oil cooler 80 is provided at the front portion of the ejector portion E by the muffler 82 at a position where the ejector effect is easily received, so as to enhance the cooling effect of the engine oil. The engine 20 provided under the collector 17 at the rear of the vehicle body 16 easily sucks turf grass into the engine room under the hood 83. The engine 20 is mounted on the vehicle body 16 with the flyweight 85 of the crankshaft 84 facing forward and facing the driver's seat 24, with the radiator 90, the radiator fan 86, the mask 87, etc. facing rearward. . Reference numeral 88 denotes an oil pan, and 89 denotes a rear axle housing. The muffler 82 is provided on the engine 20 from the upper part on one side toward the rear along the inside of the side net 81, and is provided so as to be seen in the rear end part of the muffler cutter 91 provided at the lateral end part of the radiator 85. An appropriate ejector interval portion 92 is formed between the front end portion of these muffler cutters 91 and the rear end portion of the muffler 82 to be mounted on the muffler cutter 91 to form an ejector portion E, and the oil cooler 80 is disposed on the front side. It is installed. The cooling air flowing by the rotation of the radiator fan 86 flows in the engine room from the front side to the rear mask 87 side, and sucks outside air from the left and right side covers and the side net 81 in part. Further, the exhaust of the engine 20 flows from the muffler 82 to the muffler cutter 91 and is exhausted rearward. At this time, in the ejector E section, outside air is sucked from the rear side or the side net 81 side, and the flow of cooling air in the front oil cooler 80 section can be satisfactorily maintained by this outside air suction. Since the oil cooler 80 is provided on the front side of the muffler 82, the oil cooler 80 is located on the upper side of the flow direction of the wind by the radiator fan 86, the ejector E section, and the like, and thus is heated by the muffler 82. Can be reduced.

The top view and side view of a moor deck transmission mechanism part. The front view. The some enlarged plan view. The perspective view of a moor deck, and the disassembled perspective view of the one part. The side view of a blade axis | shaft transmission mechanism part. The side view which shows the example in part. The side view of the whole tractor mower. The plan view. The perspective view of the collector part which shows the example of another part. The side view of the moor deck part which shows another example. The plan view. The side view of the shooter part which shows a part another example. The side view and the top view of a blower part which show some other examples. The top view of an engine part. The side view. The front view.

1 blade shaft 2 blade shaft 3 gear case 4 gear case <br/> 5 mower deck 6 input interlocking shaft 7 bearing metal 8 pulleys 9 input shaft 10 a pulley 11 a belt 12 an input bevel gear 13 blade bevel gear 14 blade interlocking shaft 15 interlocked bevel gear

Claims (1)

The gear case (3), (4) for bearing the upper end of the pair of left and right blade shafts (1), (2) is arranged on the upper side of the mower deck (5), and the input for bearing in one of the gear cases (3) The front end of the interlocking shaft (6) is supported by the bearing metal (7) on the front end of the mower deck (5), and the pulley (8) is attached to the front side of the moor deck (5). ) And the pulley (10) of the input shaft (9) that is supported on the center front side of the mower deck (5) width, the belt (11) is stretched over the gear case (3) on the input side. The blade interlocking shaft is supported between the blade bevel gear (13) at the upper end of the blade shaft (1) and the left and right gear cases (3) and (4) with respect to the input bevel gear (12) at the rear end of the input interlocking shaft (6). (1 ) Interlocking bevel gear (15 end) and transmission of a tractor the mower, characterized in that the transmission by meshed with.

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