JP2006180734A - Tractor mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems such that since in a high dump collector-formed tractor mower, the collector is lifted against its vehicle body, the vibration, swinging, etc., of the vehicle body occur easily on traveling at a high speed and also the vehicle is easily rolled on going over a furrow. <P>SOLUTION: This tractor mower is provided by installing the collector 3 for receiving and housing the conveyed grass mown by a mower 2 attached with the vehicle body 1, at the rear part of the vehicle body 1 as capable of being lifted up and down and as capable of dumping on being lifted up, and also regulating the vehicle speed within a low speed zone in the lifted up state of the collector 3. By lifting up the collector 3, since the vehicle speed is regulated within the low speed zone and it is impossible to speed up to a high speed zone by stepping on an accelerator pedal, etc., even if the uneven surface, slope surface, etc., of a traveling ground surface change widely, the vibration, swinging, etc., of the vehicle body and collector are reduced and a stable traveling posture is maintained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tractor mower that mounts a mower on a tractor body and cuts turf grass, and relates to a mower configured to mount a collector that accommodates turf grass cut by the mower. It is intended to drive safely by limiting the vehicle speed.

In a front mower in which a mower is mounted on the front side of the vehicle body, there is a technology for mounting a collector on the rear side so that it can be raised and lowered by a lift cylinder and a lift link and dumped by a dump cylinder at an elevated position (see, for example, Patent Document 1). Are known.
Japanese Patent Application Laid-Open No. 5-76231 (page 2, FIG. 1, FIG. 4).

  In a tractor mower that mounts a mower on a tractor vehicle body and cuts turf grass, a collector that accommodates the turf grass after cutting is mounted on the rear portion of the vehicle body so as to be movable up and down. When the turf grass accommodated in the collector is discharged, the high dump collector is used, and the collector is raised to a high position with respect to the vehicle body and then dumped. In such a configuration of the high dump collector, the collector is raised higher than the vehicle body. Therefore, when the vehicle is traveling at high speed, the vehicle body is easily oscillated or swayed.

  According to the first aspect of the present invention, a collector (3) for receiving and accommodating turf grass cut by a mower (2) mounted on the vehicle body (1) is provided at the rear portion of the vehicle body (1) so as to be movable up and down. In addition, a tractor mower structure is provided which is provided so as to be capable of dumping at the time of ascending, and restricts the vehicle speed to a low speed region when the collector (3) is in the ascending state. While traveling on the tractor body (1), the mower (2) transmits the turfgrass, and the cut turfgrass is sent to the collector (3) and stored. When the collector (3) is in the turfgrass accommodation posture, the collector (3) is at the lower limit position of the aircraft and lowers the position of the center of gravity. On the other hand, when the turfgrass is full in the collector (3), the collector (3) is raised and dumped to discharge it to any position. By raising the collector (3), the vehicle speed is restricted to a low speed range. Even if the accelerator petal or the like is depressed, the restricting means cannot act to increase the vehicle speed to the high speed range. For this reason, even if the uneven surface or the inclined surface of the traveling ground changes greatly, vibrations, swings, etc. of the vehicle body (1) and the collector (3) can be reduced, and a stable traveling posture is maintained.

  According to a second aspect of the present invention, in the first aspect, the vehicle body (1) is provided with an HST4 for continuously changing the vehicle speed, and the operation mechanism (5) for operating the HST4 is linked to regulate the vehicle speed. It is characterized by this. In a tractor mower capable of continuously variable speed travel using an HST (hydraulic continuously variable transmission) (4) as a main transmission, the operating range of the operating mechanism 5 for continuously variable speed operation is raised to the collector (3). The vehicle speed range is regulated to a low speed range of continuously variable transmission by interlocking regulation depending on the position.

  According to a third aspect of the present invention, in the first or second aspect, the trunnion arm (51) interlocked with the trunnion shaft (50) is rotated by a stepping operation of the forward petal (16) and the reverse petal (17). The HST (4) operating mechanism (5) is configured to continuously move from a neutral position to a forward speed increasing position and a reverse speed increasing position, and the forward pedal (16), And the arm shaft (53) interlockingly connected to the petal shaft (52) supporting the reverse pedal (17) and interlocking with the trunnion arm (51), and the collector (3) between the forward interlocking side and the reverse interlocking side. Each is connected via a connecting member such as a wire (68, 73) or the like, and the operation of the pedal shaft (52) is regulated by raising the collector (3) more than a predetermined amount.

  When the collector (3) is raised, the connecting member is pulled in conjunction with this, and the predetermined rotation of the arm shaft (53) and the pedal shaft (52) is restricted, and the forward pedal (16) operation and the reverse pedal (17) operation are performed. regulate.

  According to a fourth aspect of the present invention, in the first or second aspect, the trunnion arm (51) interlocked with the trunnion shaft (50) is rotated by a stepping operation of the forward petal (16) and the reverse petal (17). The operation mechanism (5) of the HST (4) is configured to continuously move from a neutral position in a state where the vehicle is stopped to a forward acceleration position and a reverse acceleration position, and the trunnion arm (51) Forms a neutral return cam (59), and a roller arm (61) is provided on the outer periphery of the roller arm (61) so as to be pivoted so that the trunnion shaft (50) is displaced forward and backward. It is configured to connect a connecting member such as a wire (68a) connected to the collector (3) to the roller arm (61) by turning and energizing so as to always return to the neutral position from the state. As a result, when the collector (3) is raised, the connecting member is pulled to restrict the rotation of the roller arm (61) beyond a predetermined level, and the trunnion arm (51) and the trunnion shaft (50) are set to a predetermined level on the forward side and the reverse side. Even if the forward / reverse pedal is depressed, the rotation of the trunnion shaft (50) more than a predetermined amount is restricted and the vehicle speed is not increased.

  According to the first aspect of the present invention, when the collector (3) for storing the cut turf grass is in the raised position or the dump position, the vehicle speed is restricted to the low speed range, and the vehicle body (1) is in a safe state for traveling. Since the rise of the collector (3) and the vehicle speed regulation are automatically performed in conjunction with each other, it is possible to eliminate erroneous operations and improve safety.

  Since the invention according to claim 2 regulates the operation mechanism 5 of the HST (4), which performs continuously variable speed travel, to the low speed range by raising the collector (3), this restriction interlocking configuration is simplified. It is possible to easily adjust the restriction position and perform maintenance.

  According to the third aspect of the present invention, when the collector (3) is raised by the connection of the collector (3) and the arm shaft (53), the forward pedal (16) and the reverse pedal (17) are rotated more than predetermined times. The vehicle speed can be regulated by regulating the movement.

  The invention according to claim 4 can regulate the rotation of the trunnion shaft (50) on both the forward side and the reverse side by connecting the wire (68a) connecting member to the roller arm (61), such as the wire (68a). The connecting member is simple with a single configuration.

  An embodiment of the present invention will be described with reference to the drawings. The tractor vehicle body 1 is equipped with an engine E at the front, and travels from the engine E via the HST 4 and a transmission mechanism in the transmission case 10 and transmits a mower 2 mounted on the abdomen of the vehicle body 1 to turfgrass. It has a mid-mower configuration that reaps the grass. A front wheel 12 that is steered and linked by a steering handle 11 is mounted on the front of the vehicle body 1, and a rear wheel 13 that is linked from a transmission case 10 via a transmission mechanism in a wheel case 15 is provided on the rear. A driver's seat 20 is provided on the seat floor 14 on the vehicle body 1, and an operation box on the side of the driver's seat 20 has an auxiliary transmission lever 24, a mower 2 transmission clutch lever 22, and a mower elevating lever that elevates and lowers the mower 2. 21 and a collector raising / lowering lever 23 for raising and lowering the collector 3 are disposed. A forward petal 16 and a reverse petal 17 are arranged on the right side of the step floor 18, and the HST can be continuously variable via the operation mechanism 5 by stepping on these petals 16, 17.

  The mower deck 19 of the mower 2 is suspended from the vehicle body 1 via parallel links 25 and 26 and is configured to be lifted and lowered by operating the mower lift lever 21. The blade shaft of the mower 2 is provided such that it can be transmitted from the front PTO 27 provided at the front portion of the vehicle body 1 via the interlocking shaft 28.

  A collector frame 38 provided upright at the rear portion of the vehicle body 1 is provided so that the collector 3 can be raised and lowered via lift links 31 and 32 in the form of parallel links, a lift cylinder 33 and the like. At the time of lowering, the front inlet 34 of the collector 3 can be connected to a discharge cylinder 35 formed between the rear wheels 13 at the bottom of the vehicle body 1 to receive the cut grass. Further, at the time of ascent, the collector 3 can be rotated and turned to the rear side at the uppermost position to open the cover 36, and turfgrass can be discharged from the open portion of the cover 36.

  That is, lift links 31 and 32 are pivotally supported on an upper part of a collector frame 38 attached to the rear end of the vehicle body 1 via a hitch 37 so that the lower part of the frame 38 and the lift link 31 are connected. Thus, a lift cylinder 33 for moving the links 31 and 32 up and down is provided. In the box-shaped collector 3, support pins 41 protruding from the left and right rear portions are supported by a lift arm 42 pivotally connected to the rear ends of the lift links 31 and 32, and the support pins 41 are surrounded by the support pins 41. It is configured to be dumpable. A dump cylinder 44 is provided between the rear portion of the side wall of the collector 3 and the rear end portion of the lift arm 42, and the collector 3 can be rotated around the support pin 41 by the extension of the cylinder 44. Further, the upper end of the link arm 42 is connected to the lower end of the cover arm 43 integral with the cover 36, and the cover 36 is simultaneously opened by the dumping action of the collector 3. The cover 36 is configured such that the cover-side pin 36a and the connector-side hook 36b are locked by an unillustrated elastic force so as to seal the rear opening of the collector 3, and a wire 36c is fixed to the hook 36b. When the wire 36c is pulled up to release the engagement with the pin 36a of the hook 36b, the cover 36 can be opened.

  At the time of turfgrass cutting, the collector 3 is fixed to the lowest turfgrass accommodation position A. Turf grass mowed by the mower 2 as the vehicle body 1 travels is introduced into the collector 3 through the discharge port on the rear side of the mower 2 deck 19 and guided to the collector 3 for storage. When the turf grass of the collector 3 is full due to the cutting, the lift cylinder 33 is extended by operating the collector raising / lowering lever 23 and the lift links 31 and 32 are moved upward to operate the collector 3 from the storage position A to the lift position B. . When the collector 3 reaches the upper limit position C, the dump cylinder 44 is subsequently extended so that the collector 3 is rotated around the support pin 41 and is hooked so as to be opened by extrusion by the cover arm 43. The cover 36 which has been disengaged from 36b is opened, is placed in the dump position D, and the turfgrass is discharged. Further, when the collector 3 after discharging the turf grass is returned to the storage position A, the operation is reverse to the above.

  The HST 4 rotates the trunnion shaft 50 and the arm 51 by the stepping operation of the forward petal 16 and the reverse petal 17, so that there is no change from the neutral position (stopped state) to the forward acceleration position and the reverse acceleration position. The operation mechanism 5 is configured to perform step shifting. A forward link rod 54 and a reverse link rod 55 are formed between the petal shaft 52 and the arm shaft 53 of the vehicle body 1. When the forward petal 16 is stepped on, the arm shaft 53 is rotated forward via the link rod 54. When the reverse petal 17 is stepped on, the arm shaft 53 rotates in the reverse direction via the link rod 55. 56 is a damper. The arm 57 integrated with the arm shaft 53 and the trunnion arm 51 are connected by a link rod 58 whose length can be adjusted. A neutral return cam 59 is formed on the trunnion arm 51, and a roller 60 is ejected on the outer periphery. The roller 60 is rotatably provided on the roller arm 61, and is oscillated around the arm shaft 62 and is repelled by a spring 63 force. Due to the contact pressure of the roller 60, the trunnion arm 51 and the trunnion shaft 50 are urged to rotate so as to always return to the neutral position. Reference numeral 64 denotes a transmission shaft in the transmission case 10, and 65 denotes a traveling brake that brakes the rotation of the transmission shaft 64.

  Here, the configuration of the restricting means for restricting the rising state of the collector 3 and the vehicle speed is as follows. 1 to 3, a pin 67 is provided on a projecting arm 66 below the arm shaft 53 rotated by the petals 16 and 17, and a pin 69 is attached to a plate 69 at the tip of a wire 68 (linking member). The formed long hole 70 is fitted. Further, a pin 72 is provided on the arm 71 protruding above the arm shaft 53, and a long hole 75 formed in the plate 74 at the tip of the wire 73 (linking member) is fitted into this pin 72. Both wires 68 and 73 are connected to the lift link 31 of the collector 3. By raising the lift link 31, the plates 69 and 74 having the long holes 70 and 75 at the tip are pulled, and the movement of the pins 67 and 72 fitted in the long holes 70 and 75 is locked and limited. . When the forward petal 16 is stepped on, the pin 67 of the arm 66 on the link rod 54 side is locked in the elongated hole 70, and the increase in the forward vehicle speed is limited. When the reverse petal 17 is stepped on, the pin 72 of the arm 71 on the link rod 55 side is locked in the elongated hole 75, and the increase in the reverse vehicle speed is limited. For this reason, when the collector 3 is located at the upper limit position C from the raised position B, the degree of regulation of the vehicle speed increases according to the raised position, and the upper limit of the vehicle speed becomes lower according to the higher position.

  Next, referring to FIG. 4 and FIG. 5, the elongated hole 70a formed in the plate 69a at the tip of the wire 68a (linking member) connected to the lifting member of the collector 3, for example, the lift link 31, is used for the neutral return. This is a form to be fitted to a pin 76 provided on the roller arm 61. The roller arm 61 swung around the arm shaft 62 by the neutral return cam 59 rotated by the petals 16 and 17 is pushed out from the neutral position to the outer peripheral side both on the forward side and the reverse side. Since it is rotated, the pin 76 is locked on the tip end side of the long hole 70a of the plate 69a. For this reason, the rocking area of the roller arm 61 is restricted by the position of the plate 69 and the long hole 70 pulled by the rise of the collector 3, and when the rocking of the roller arm 61 is locked, the trunnion arm 51 is rotated. Is also locked, and the acceleration position of the reverse and forward of HST4 is regulated. In the form in which the wire 68a is connected to the roller arm 61, the wire 68a is simple and simple.

  Next, the configuration of the mower deck 19 will be described with reference to FIGS. The mower deck 19 is provided with a pair of left and right blade shafts 80, and a blade 81 is attached to the lower end thereof. A bearing metal 83 for bearing the blade shaft 80 with a bearing 82 is mounted on the mower deck 19 by tightening bolts 84. A deck bracket 86 with legs 85 is attached to the upper side of the bearing metal 83 with bolts 87. The lower end edge of the leg 85 is in contact with the upper surface of the mower deck 19. A pulley 88 is attached to the upper end of the blade shaft 80. A bolt 91 having a collar 90 that is fixed or rotatable on the outer peripheral portion of the toothed belt 89 hung on the pulley 88 is provided on the deck bracket 86. The collar 90 bolt 91 is disposed on the outer peripheral portions on both sides of the belt 89 winding portion to prevent belt tooth skipping due to the bulging of the belt 89. The gap between the outer peripheral surface of the belt 89 and the collar 90 surface is maintained at about 1 millimeter. At the lower end of the blade shaft 80, the central portion in the length direction of the blade 81 is attached to the washer 92 by tightening a bolt 93. A pin hole 94 is formed at both sides in the width direction of the bolt hole 79 for inserting the bolt 93 at the center of the blade 81, and the gap between the blade boss 95 and the washer 92 is screwed into the lower end of the blade shaft 80. The blade 81 is superposed and attached by tightening the bolt 93, and the pin 96 is fitted over the pin hole formed in the washer 92 facing the pin hole 94 of the superposed portion, the blade boss 95, etc. It is configured to rotate integrally with the shaft 80. Since the pin hole 94 into which the pin 96 is inserted is provided in the width direction of the lateral blade 81 of the bolt hole 97, the blade 81 is hardly cracked and durability can be improved.

  An input transmission case 98 is provided at the center front portion of the moor deck 19 and has an input shaft 99 that is linked via the linkage shaft 28. A belt 89 is stretched between the pulley 101 of the output shaft 100 on the transmission case 98 and the pulley 88 on the blade shafts 80 on the left and right side portions. Around each blade shaft 80 pulley 88, a pulley 102 for tensioning a belt 89 is supported on a pulley shaft 103 of a deck bracket 86 portion. The left deck bracket 86 is integrally formed with a reinforcing plate 104 along the direction between the tension pulley shafts 103 in addition to the legs 85. In order to adjust the tension pressure of the belt 89, the tension plate 105 is provided on the right deck bracket 86, and the tension pressure of the spring 107 is adjusted by the adjusting nut 106, and the tension pulley 102 of the tension plate 105 is adjusted. Move and adjust the tension of the belt 89 easily and accurately. The tension plate 105 is provided to be supported by a support shaft 108 positioned at a winding interval around the pulley 88 of the belt 89, and long holes 109 and 110 are formed in an arc shape around the support shaft 108. Locking bolts 111 and 112 for fastening 109 and 110 are screwed into the deck bracket 86 so that the tension plate 105 can be fastened and fixed to the deck bracket 86. 113 is a grounding wheel provided on the front side of the mower deck 19, and 114 is a gauge wheel provided on the rear side. Reference numeral 115 denotes a discharge port formed in the rear center, which can guide the discharge of the cut grass.

  Next, based on FIGS. 11 and 12, a transmission cover 116 that covers the belt 89 transmission mechanism is provided on the upper side of the mower deck 19. An inspection window 117 is formed on the transmission cover 116 over the adjustment spring 107, nut 106, lock bolts 111, 112, and the like (FIG. 12), and an opening / closing cover 118 capable of opening and closing the inspection window 117 is provided. Thus, the hook 119 can be closed and fixed (FIG. 11). This makes it easy to check and adjust the tension of the belt 89.

  Next, the configuration of the clogging sensor 121 that detects turfgrass clogging in the discharge cylinder 35 will be described with reference to FIG. A sensor plate 123 that receives the pressure of turf grass and moves downward against the spring 122 is provided at the bottom of the discharge cylinder 35 so as to swing up and down around the support shaft 130. A limit switch 124 that is turned on and off by being pushed by the sensor plate 123 is provided so that the harness 125 can be plugged into the sensor circuit. The support plate 127 at the bottom of the sensor case 126 having the sensor plate 123, the limit switch 124, and the like is formed with a long adjustment hole 128 in the front-rear direction, and the adjustment tool 129 is fitted to the support plate 127 so that it can be moved forward and backward. It is provided that the position of the spring 122 can be adjusted to move the distance toward the support shaft 130 along the lower surface of the sensor plate 123. The spring 122 is fitted between a pair of upper and lower coupling sliders 131, 132 that can be extended and contracted, and the upper surface of the upper coupling slider 131 can slide and adjust along the lower surface of the sensor plate 123. It is. By adjusting the movement of the spring 122, the spring 122 becomes sensitive when moved toward the support shaft 130, and becomes insensitive when moved away from the support shaft 130. Easy assembly and easy adjustment.

  Next, mainly based on FIG. 14 and FIG. 15, a blower 135 is provided at the rear end of the discharge cylinder 35, and this blower 135 is interlocked from the transmission mechanism of the transmission case 136 via the clutch 134, It can be carried into the collector 3 from the blower cylinder 137 at the upper end. The vehicle body 1 has a front mower configuration in which the step floor 18 and the steering handle 11 are overhanged on the upper side of the mower deck 19. The engine E is mounted at the rear end portion, and is configured such that the fuel tank 138 straddles the front side of the blower cylinder 137 on the rear side of the driver's seat 20 from side to side. An HST 4 is provided on the rear side of the transmission case 136, and transmission cases 139 for transmitting the front wheels 25 are arranged on both the left and right sides. Since the blower 135 and the HST arranged in front of and behind the mission case 136 are arranged in series, the arrangement can be simplified by arranging them along the coaxial core. Further, since the fuel tank 138 is formed so as to straddle the blower cylinder 137 to the left and right, it can be provided as low as possible, facilitating refueling. In addition, by configuring the suspension 139 for supporting the driver seat 20 and the support frame 140 so as to straddle the left and right side portions of the discharge cylinder 35, the position of the discharge cylinder 35 can be configured to be high. The stable operation with a low center of gravity can be performed.

A side view of the mower collector. The side view which shows the operating state of a collector part. The side view of a petal operation mechanism part. The plan view. The top view of the one part. The top view of a moor deck part. The sectional side view of the blade axial part. The top view and side view of the deck bracket part. The enlarged plan view of the tension pulley part. The top view of the blade part. The top view of a moor deck cover part. The top view which shows the action state. The top view and side view of a clogging sensor part. The top view of the vehicle body part which shows another Example. The side view (I) and the front sectional view (b) of some driver seats.

Explanation of symbols

1 Body 2 Moor 3 Collector 4 HST
5 Operation mechanism 16 Forward pedal 17 Reverse pedal 50 Trunnion shaft 51 Trunnion arm 52 Pedal shaft 53 Arm shaft 59 Neutral return cam 61 Roller arm 68 Wire (linking member)
68a wire (linking member)
73 Wire (linking member)

Claims (4)

 A collector (3) for receiving and storing turf grass harvested by the mower (2) mounted on the vehicle body (1) is provided at the rear of the vehicle body (1) so as to be able to be raised and lowered, and to be dumped when this is raised. The tractor mower is characterized in that the vehicle speed is restricted to a low speed range when the collector (3) is raised.  2. The tractor mower according to claim 1, wherein the vehicle body (1) is provided with an HST 4 that continuously changes the vehicle speed, and the vehicle speed is regulated in conjunction with an operation mechanism (5) that operates the HST 4.   By depressing the forward petal (16) and the reverse petal (17), the trunnion arm (51) interlocking with the trunnion shaft (50) is rotated, and the vehicle is stopped from the neutral position to the forward acceleration position. The operation mechanism (5) of the HST (4) is configured to continuously change to the acceleration position, and is linked to the petal shaft (52) that supports the forward pedal (16) and the reverse pedal (17). The trunnion arm (51) is linked between the arm shaft (53) and the collector (3) via a connecting member such as a wire (68, 73) for each of the forward interlocking side and the reverse interlocking side, The tractor mower according to claim 2, wherein the operation of the pedal shaft (52) is regulated by raising the collector (3) more than a predetermined amount.   By depressing the forward petal (16) and the reverse petal (17), the trunnion arm (51) interlocking with the trunnion shaft (50) is rotated, and the vehicle is stopped from the neutral position to the forward acceleration position. The operation mechanism (5) of the HST (4) is configured to continuously change the speed to the acceleration position, and the trunnion arm (51) is formed with a neutral return cam (59), and a roller arm (61 ) And a roller (60) provided so as to be rotatable, and is urged to rotate so that the trunnion shaft (50) is always returned to the neutral position from the forward and backward displacement states of the trunnion shaft (50). The tractor mower according to claim 2, wherein a connecting member such as a wire (68a) connected to 3) is connected to the roller arm (61).

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