JP2007330229A - Riding type lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding type lawn mower that can simply and easily be attached to or detached from the body of the mower. <P>SOLUTION: The mower 43 is arranged between the front left and right wheels 2, 2 and the rear left and right wheels, a rotation fulcrum is set on the mower body, and the front and rear link arms 51F, 51R are linked in one body via the fulcrum with each other and hung down. One of the front and the rear link arms is rotatably linked through the link holder tool 60, 64 to the brackets 57F, 57R on the mower 43 side in the horizontal direction, and in the other link arm the supporting shaft portion arranged in its lower end side is connected to the fulcrum receiving groove 63R having an opening part 62R formed on the bracket 57R on the side of mower 43 to be turnably connected around a horizontal axis. When the link and holding tool of the link arm 51F of the one link arm is released, the support shaft part of the other link arm 51R is released and the supporting shaft is unhinged from the opening part 62R. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a riding lawn mower having left and right front wheels and left and right rear wheels and having a mower that is mounted on a vehicle body so as to be movable up and down.

2. Description of the Related Art Conventionally, a riding lawn mower having left and right front wheels and left and right rear wheels and having a mower mounted on a vehicle body by a link mechanism so as to be movable up and down is known.
The mower of such a riding lawn mower is arranged between the front wheel and the rear wheel, and its lifting mechanism has four link arms of the same length between the mower deck and the vehicle body frame in the front, rear, left, and right sides. The link arms are attached to both ends of one lift shaft that spans from side to side at the front of the body frame, the rear link arms are pivotally attached to the rear middle part of the body frame, and the lower ends of the link arms are respectively A pin is detachably connected to the mower deck.
JP 2005-117966 A

  However, when the maintenance is performed with the mower removed, there is a problem of removing front and rear, left and right four front portions of the removable pins. Even if the pin insertion / removal configuration is simplified, it must be performed in front, rear, left, and right.

  For this reason, the present invention tries to easily and easily attach and detach the mower.

  In view of the above, the invention according to claim 1 is a riding lawn mower having left and right front wheels (2, 2) and left and right rear wheels (3, 3), and having a mower (43) that is mounted on the vehicle body so as to be movable up and down. In the machine, a mower (43) is disposed between the left and right front wheels (2, 2) and the left and right rear wheels (3, 3), and the vehicle body has a rotation fulcrum and is connected to each other. The front and rear link arms (51F, 51R) that pivot around the fulcrum are provided in a suspended manner, and one of the front and rear link arms is connected to the bracket (57F, 57R) on the mower (43) side ( 60, 64) is pivotally connected around the horizontal horizontal axis, and the other link arm is formed with a support shaft portion provided on the lower end side of the bracket (57R) on the mower (43) side, and an open portion (62R). ) Around the horizontal axis by engaging with the fulcrum receiving groove (63R) And allowing the support shaft portion of the other link arm (51R) to be disengaged from the open portion (62R) by releasing the connection holding tool of the one link arm (51F). It is set as the structure of the characteristic riding lawn mower.

  If comprised as mentioned above, in the attachment or detachment of a mower (43), the connection holder (60, 64) comprised by one (51F) of the link arms (51F, 51R) will be removed. Then, the one side link arm (51F) and the mower (43) side bracket (57F) are separated. In this state, when the support shaft portion of the other link arm (51R) is displaced toward the open portion (62R) of the fulcrum receiving groove (63R), the entire mower (43) is displaced, so that the link arm (51R) Is separated from the bracket (57R).

  According to the second aspect of the present invention, the connecting pin on one link arm (51F) side is in the bracket (57R) on the mower (34) side, and the connecting pin (60) always urged in the axial direction is inserted and removed. The riding lawn mower according to claim 1, which is configured as described above. Therefore, it becomes easy to insert or remove the connection pin (60) as the connection holder.

  In the invention according to claim 3, the front and rear brackets (57F, 57R) on the mower (43) side are provided with fulcrum receiving grooves (63F, 63R) having open portions (62F, 62R), and either The riding lawn mower according to claim 1, wherein a detachable coupling holder (64) for holding a fulcrum pin of the link arm (51F) is provided on the bracket (57F). The configuration of the link arms (51F, 51R) is the configuration of the arm portion and the distal end side support shaft, which can be the same in the front and rear, facilitating component management.

  According to a fourth aspect of the present invention, the jack (100) is mounted on the front frame of the vehicle body, the front frame is provided so that it can be jacked up, and is connected to the bracket (57F) side including the connecting holders (60, 64). 4. The riding lawn mower according to claim 1, wherein the link arm to be used is a front link arm (51F). Accordingly, when the jack (100) is attached to the front part of the vehicle body and the vehicle body is lifted to the center of the grounding part of the rear wheels (3, 3), the mower (43) is also raised to a high posture in parallel. In this state, the mower (43) can be inspected and maintained.

  According to the first aspect of the present invention, the link arm (51F) on one side and the bracket on the mower (43) side are separated by removing the connecting holder from one (51F) of the link arms (51F, 51R). If the entire mower (43) is displaced in this state, the link arm (51R) is separated from the bracket, so that the connection can be released only on one side of the front and rear link arms, and the operation can be simplified.

In addition to the above, the invention according to claim 2 can facilitate the insertion or extraction of the connecting pin (60) as the connecting holder, thereby improving the efficiency of the work.
The invention according to claim 3 makes it possible to make the configuration of the link arms (51F, 51R) the same at the front and rear, facilitating parts management. The invention according to claim 4 raises the mower (43) to a higher position. Since the connecting holder is configured on the front link arm side to be provided, it is difficult to come off easily due to a load, and it is safe without causing an unexpected drop.

Embodiments of the present invention will be described below with reference to the drawings.
First, as shown in FIGS. 1 and 2, the riding lawn mower 1 includes front wheels 2, 2 and rear wheels 3, 3, and the front wheels 2, 2 are configured by non-drive type caster wheels, 3 is driven by the power of the engine 4.

  The engine 4 is provided at the rear of the machine body, and is elastically supported via four vibration isolators (not shown) between a pair of left and right main frames 6 and 6 provided along the front-rear direction. Yes. The engine 4 is located behind the axles 3a and 3a of the rear wheels 3 and 3 when viewed from the side, and a muffler 9 and an air cleaner 10 are disposed above it. The tail pipe 9a of the muffler 9 is extended downward from the main body portion, and the exhaust port portion is directed laterally outward.

Further, a suction fan 12, a radiator 13, and an oil cooler 14 are provided in this order on the rear side in the traveling direction of the engine 4.
The engine 4, muffler 9, air cleaner 10, radiator 13, and other outer peripheral parts are covered with a box-shaped bonnet 16, and the bonnet 16 is configured so that the front side can be opened largely upward with a fulcrum provided at the rear lower part as a center. is doing. A slit-like outside air inlet 16a is provided on the rear surface of the bonnet 16, and cold outside air is taken into the bonnet 16 from the outside air inlet 16a to cool auxiliary devices such as the muffler 9 and the air cleaner 10 around the engine 4. Yes.

  On the other hand, a transmission case 18 is provided in front of the engine 4, and an input shaft 19 provided in the transmission case 18 and an output shaft 20 on the engine 4 side are connected by a universal joint shaft 22. A pair of hydraulic continuously variable transmissions (HSTs) 24, 24 have variable displacement hydraulic pumps 25, 25 on the left and right sides (right side in FIG. 2) of the transmission case 18 in the state where the rotational axis is aligned. The hydraulic pumps 25 and 25 are always driven by a drive mechanism including a plurality of gear groups provided in the transmission case 18 during operation of the engine 4.

  The hydraulic motors 27 and 27 of the hydraulic continuously variable transmissions (HST) 24 and 24 are provided in the vicinity of the shaft support portions of the rear wheels 3 and 3, and swash plates (not shown) of the hydraulic continuously variable transmissions (HST) 24 and 24. ) To adjust the rotation speed and the rotation direction of the hydraulic motors 27 and 27. The hydraulic motor portions 27 and 27 are detachably attached to motor brackets 23 and 23 fixed to the outside of the main frames 6 and 6. The swash plates of the hydraulic pumps 25, 25 of the hydraulic continuously variable transmissions (HST) 24, 24 are operated by operating a pair of left and right steering levers 30, 30 provided at the front of the cockpit 28 in the front-rear direction. Is adjusted.

  Next, an interlocking relationship between the steering levers 30 and 30 and the trunnion shafts 31 and 31 on the hydraulic pumps 25 and 25 side will be described with reference to FIGS. The pivot shaft 32 of the right steering lever 30 formed of a cylindrical body is provided with an arm member 34 that protrudes downward integrally therewith. Similarly, the left steering lever 30 configured of a cylindrical body of the left steering lever 30 is provided. The rotary shaft 33 is provided with an arm member 35 that projects upward integrally therewith, and these arm members 34, 35 are plates 37, 38 fixed to the trunnion shafts 31, 31 of the hydraulic pumps 25, 25, respectively. The rods 40 and 41 are interlocked and connected. When the steering levers 30 and 30 are tilted forward from the neutral position where the airframe is stopped, the trunnion shafts 31 and 31 of the hydraulic continuously variable transmissions (HST) 24 and 24 are rotated in the forward direction. On the contrary, the trunnion shafts 31, 31 are rotated in the reverse direction when the aircraft is pulled backward from the neutral position, so that the aircraft moves backward. When the left and right steering shift levers 30 and 30 are operated in opposite directions, one trunnion shaft 31 rotates in the forward direction and the other trunnion shaft 31 rotates in the reverse direction so that the interlining can be turned on the spot.

  As shown in FIG. 6, the two steering levers 30 and 30 can be tilted outward in a neutral position and perpendicular to the operation direction. Since the interval between 30 and 30 is widened and the operator can pass between the steering levers 30 and 30, getting on and off is facilitated.

Next, the structure of the mower 43 and the drive system will be described.
At the front part of the transmission case 18, a PTO shaft 42 projects from the front, and the input shaft 44 on the mower 43 side interposed between the front and rear wheels 2, 2, 3, 3, and the PTO shaft 42. A universal joint shaft 45 is detachably interposed between the two. The power on the engine 4 side is transmitted to or disconnected from the PTO shaft 42 by turning on and off a hydraulic clutch (not shown) provided in the transmission case 18.

  The mower 43 includes three cutting blades 46, 46, 46 in the deck 43a. The mower 43 receives power from the PTO shaft 42 pivotally supported by the gear case 43b via a power transmission member such as a belt. The cutting blades 46, 46, 46 are all rotated in the clockwise direction when viewed from above to cut grass and grass. A mowing grass discharge port 47 for discharging the cut grass and grass is provided on the right outer side of the mower deck 43a, and the cut grass is discharged outward from the discharge port 47. A discharge cover 48 that is rotatable up and down is provided above the discharge port 47, and presses and urges the entire cover downward so that the grass cut in the mower deck 43 a is guided only outward in the lateral direction.

  Next, the raising / lowering mechanism of the mower deck 43a is demonstrated based on FIG. 1 and FIGS. 7-9. The mower deck 43a is supported by a front frame 49 connected to the front portions of the main frames 6 and 6 through link mechanisms 50 and 50 so as to be movable up and down, and hydraulic oil is supplied to a single hydraulic cylinder 52 provided on one side of the front portion of the machine body. When mower deck 43a is supplied or discharged, the entire mower deck 43a moves up and down substantially parallel to the ground.

  More specifically, the link mechanism 50 includes four link arms 51F, 51F, 51R, 51R having substantially the same length on the front, rear, left, and right, and the front link arms 51F, 51F are bridged on the left and right at the front portion of the front frame 49. The rear link arms 51R, 51R are pivotally attached to the rear intermediate portion of the front frame 49, and the lower ends of the link arms 51F, 51F, 51R, 51R are mower decks 43a. The brackets 57F, 57F, 57R, and 57R are detachably connected to the front and rear brackets 57F, 57F, 57R, and 57R. The lower end portions of the front link arms 51F and 51F are provided with pin mounting holes 58, and the corresponding front brackets 57F and 57F are inserted with connection pins 60 as connection holding members biased by springs 59 in the horizontal axis direction.・ Connected freely. The spring 59 is held in the insertion direction.

  A horizontal pin 61R is fixed to the lower end portion of the rear link arm 51R by welding or the like, and is provided at a suitable height position of the rear bracket 57R so that it can be engaged with and disengaged from a fulcrum receiving groove 63R having an open portion 62R.

Reference numeral 64 denotes a connecting rod that integrally connects the front link 51F and the rear link 51R.
Further, two arms 55, 55 are fixed upward on the left side of the lift shaft 53, and the front end of the hydraulic cylinder 52 is connected to the tip of the arms 55, 55 by a pin 56. The rear end of the hydraulic cylinder 52 is pivotally attached to the left inner portion of the front frame 49 with a pin 56.

  Accordingly, when the mower 43 is mounted, the rear link arm 51R is locked to the fulcrum receiving groove 63R of the bracket 57R, and the front link arm 51F is connected to the connecting pin 60 of the bracket 57F and the pin mounting hole of the front link arm 51F. 58 are matched and connected. In this way, the suspension support work of the mower 43 is completed. When the hydraulic oil is supplied to or discharged from the hydraulic cylinder 52, which is an actuator, and the piston is expanded and contracted, the lift shaft 53 is rotated and the link mechanisms 50, 50 are rotated up and down. The mower deck 43a is moved up or down.

  Further, in order to remove the mower 43, the connecting pin 60 is pulled out and kept in that state (for example, the pin 60 is pulled out of the spring and shifted in phase by 90 degrees so that the pin holder has its pulling position. It is possible to remove the mower 43 from the front and rear link arms 51F and 51R by shifting the position of the mower 43 rearward.

  Accordingly, the mower 43 can be detached without operating the rear link arm 51R by pulling out the connecting pin 60 of the front link arm 51F, and the attachment / detachment can be facilitated.

  FIG. 9 shows another embodiment of the link mechanism 50. The front link arm 51F and the rear link arm 51R have the same length, and a horizontal pin 61F and a horizontal pin 61R are fixed to the lower ends by welding or the like, respectively. The bracket 57F and the bracket 57R are provided with fulcrum receiving grooves 63F and 63R whose rear portions are open portions 62F and 62R, respectively, so that the horizontal pins 61F and 61R can be received. On the front bracket 57F side, a locking pin 64 as a connecting holder is provided to prevent the horizontal pin 61F inserted in the vertical direction and locked to the groove 63F from dropping off from the opening 62F. Therefore, when the pin 64 is pulled out and the mower 43 is displaced forward, the horizontal pins 61F and 61R of the front and rear link arms 51F and 51R can be removed from the fulcrum receiving grooves 63F and 63R.

  Therefore, the mower 43 can be separated by operating the locking pin 64 as in the above example, and the link arms 51F and 51R can have the same configuration both in the front and rear, facilitating component management. Further, the locking pin 64 is also formed on the rear bracket 57R, so that the front side can be automatically cut off when the connection on the rear side is released.

Next, the rear wheel brake device and its operation mechanism will be described.
On the upper surface of the front frame 49, as shown in FIG. 1, a front portion rises diagonally, and a single step 67 having a flat footrest portion in the lateral direction is attached as a whole. An arm 69a of the brake pedal 69 faces the front portion of the step 67, and the rear wheel brake devices 70 and 70 are operated when the operator steps on the upper surface of the brake pedal 69 (solid line in FIG. 1). .

  More specifically, the rear wheel brake devices 70, 70 are provided above the hydraulic motors 27, 27, and are configured such that when the brake pedal 69 is depressed, the left and right rear wheel brakes 70, 70 work simultaneously. .

  A parking operation member (operation pedal) 78 for maintaining the depressed state of the brake pedal 69 is provided in the vicinity of the left side of the brake pedal 69, and the parking operation pedal 78 has a locking plate 79 having a serrated locking portion. These can be rotated around a fulcrum 80.

  The serrated locking portion formed on the lower surface of the locking plate 79 is configured to be engageable with the upper surface of the plate 82 fixed to the front portion of the arm 69a of the brake pedal 69, and the brake pedal 69 is depressed with the right foot. If the parking operation pedal 78 is stepped on with the left foot while maintaining the state, the tooth of the serrated locking portion of the locking plate 79 is hooked on the upper part of the plate 82 integrated with the brake pedal 69, and the brake is applied. The pedal 69 is configured to be kept depressed.

  In FIG. 3, a front frame 49 is integrally fixed to the front portions of main frames 6 and 6 by welding, bolting, or the like, and a vehicle body is formed here. At the front part of the main frames 6 and 6, two vertical frames 87 and 87 having a U-shaped cross section are erected, and a seat frame 88 is fixed between the vertical frames 87 and 87 along the front-rear direction. A safety frame 90 is erected on the rear upper part of the seat frame 88. The safety frame 90 protects the operator when the aircraft rolls over and is formed in an inverted U shape when viewed from the back, and its base is connected by a frame 91 made of a hollow pipe or L-shaped steel pipe provided along the left-right direction. Thus, the entire safety frame 90 is reinforced.

Next, the jack apparatus 100 for lifting the front side portion of the traveling vehicle body will be described with reference to FIGS. 1 and 10.
An attachment frame 49a is attached to the front end of the front frame 49 so as to extend in the left-right direction, and the support bracket 101 of the front wheels 2 and 2 is supported on the frame 49a so as to be able to roll left and right. It is configured to cover. In addition, brackets 103 and 103 for storing the concave jack device 100 are attached to the upper portion of the mounting frame 49a with an appropriate interval, and the jack device 100 is fitted and supported along the left and right directions in the concave portions of the brackets 103 and 103. It is configured to do. In addition, a concave support bracket 104 protruding toward the front side is attached to the left and right central portion of the attachment frame 49a. The jack device 100 includes a shaft and a cylinder that are screw-fitted, and the shaft and the cylinder are expanded and contracted by rotating the handle 100a forward and backward, and a grounding plate 100b is laterally arranged at the lower end. It is supported by a pin.

  Thus, during the traveling work of the riding lawn mower, the jack device 100 is fitted and supported along the left-right direction in the concave portion of the storage bracket 103 of the mounting frame 49 a and is closed by the opening / closing cover 102. When the lawn mower 43 is maintained by raising the front side portion of the traveling vehicle body, the jack device 100 is fitted and attached to the support bracket 104 with the brakes applied to the rear wheels 3 and 3, and the ground plate The jack apparatus 100 is erected in a state where the ground 100b is grounded. Then, the handle 100a is turned to extend the jack device 100 to raise the front side portion of the traveling vehicle body, and the lawn mowing device 43 is inspected in a state where it is raised to a predetermined angle with respect to the ground.

  With the jack device 100 of the riding lawn mower configured as described above, when the front part of the traveling vehicle body is lifted, the left and right front wheels 2 and 2 are simultaneously lifted, so that a wide space is formed below the vehicle body and maintenance work is facilitated.

  Further, when the jack device 100 is used, since the mounting frame 49a is also provided with a support portion for connecting the jack device 100, the handling operation of the device 100 is easy to understand and the operation is also simple. Further, when the jack device 100 is stored, the jack device 100 is stored along the mounting frame 49a, so that it can be stored compactly.

  Further, of the link mechanism 51, the connecting holders 60 and 64 are configured on the link arm 51F side. During jack-up, a load acts on the connecting pin 60 and the locking pin 61F that support the link arm 51F. The connection holders 60 and 64 cannot be inserted / removed, and the unexpected mower can be prevented from falling off.

  FIG. 12 shows a reference example of the steering lever 30. One of the left and right grips 30g, 30g provided in a butt shape is extended as shown in the figure, and the extension 30b is arranged in the lower vicinity of the other grip 30g. In this way, the extension 30b can be operated with the thumb of the same hand while holding the grip 30g with the left hand and operating it back and forth as shown in the figure, and other operations such as switching the PTO on / off switch, mower, etc. The left and right steering levers can be operated while using the right hand with the lifting / lowering lever operation, and the operation of the grip portion of the conventional butt-shaped steering lever 30 can be continued with less fatigue.

1 is an overall side view of a riding lawn mower. It is a whole top view of the riding lawn mower except a cockpit. It is an enlarged side view of the cockpit side. It is an enlarged plan view which shows the circumference | surroundings of a transmission case. It is an enlarged side view which shows the effect | action of a steering lever. It is a front view which shows the effect | action of a steering lever. It is a side view which shows a raising / lowering link mechanism part. It is a top view (A) same as the above, and some enlarged explanatory views (B) and (C). It is a side view (A) and (B) which show another example. It is a side view in use of a jack. It is a top view at the time of jack accommodation. It is a rear view which shows the reference example of a steering lever.

Explanation of symbols

1 Riding lawn mower 2 Front wheel 3 Rear wheel 6 Main frame 43 More 43a More deck 50 Link mechanism 51F Front link arm 51R Rear link arm 52 Hydraulic cylinder 53 Lift shaft 57F Front bracket 57R Rear bracket 60 Connection pin (connection holder)
61F Horizontal pin 61R Horizontal pin 62F Opening part 62R Opening part 63F Support point receiving groove 63R Support point receiving groove 64 Locking pin (connection holder)

Claims (4)

The invention described in claim 1 is a riding lawn mower having left and right front wheels (2, 2) and left and right rear wheels (3, 3), and having a mower (43) that is mounted on the vehicle body so as to be movable up and down. A mower (43) is arranged between the left and right front wheels (2, 2) and the left and right rear wheels (3, 3), and the vehicle body has a pivotal fulcrum and is connected to each other so as to rotate around the fulcrum. The front and rear link arms (51F, 51R) are provided in a suspended manner, and one of the front and rear link arms is connected to the bracket (57F, 57R) on the mower (43) side (60, 64). The other link arm has a support shaft portion provided at the lower end side thereof formed on a bracket (57R) on the mower (43) side and has an open portion (62R). Rotating around horizontal axis by engaging with fulcrum receiving groove (63R) Riding lawn mowing characterized in that it is connected and the support shaft part of the other link arm (51R) is released from the open part (62R) by releasing the connection holding tool of the one link arm (51F). Machine. The link holding member (60) on the one side of the link arm (51F) is configured by inserting and removing a connection pin (60) that is always urged in the axial direction on the bracket (57F) on the side of the mower (34). The riding lawn mower according to 1 Support bracket receiving grooves (63F, 63R) having open portions (62F, 62R) are formed in the front and rear brackets (57F, 57R) on the mower (43) side, and link arms (57F) are provided with link arms (57F). The riding lawn mower according to claim 1, further comprising a detachable coupling holder (64) for holding a fulcrum pin (61F) of 51F). A jack (100) is mounted on the front frame of the vehicle body so that the front frame can be jacked up, and the link arm connected to the bracket (57F) side including the connecting holders (60, 64) is connected to the front link arm ( The riding lawn mower according to claim 1 to 3, which is 51F).

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