JP2007267625A - Riding lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the body construction of a riding lawn mower and increase the supporting strength of a blower for the transfer of mowed grass. <P>SOLUTION: The traveling body of the mower is divided into a front frame 2a having broad lateral width and positioned at a high level and a rear frame 2b having narrow lateral width and positioned at a low level. The front frame 2a and the rear frame 2b are joined together with an intermediate plate frame and fixed in a manner to coincide the lateral center lines of the front and rear frames 2a, 2b to the intermediate frame while staggering the end part in vertical and lateral directions. An engine 12 is mounted on the front frame 2a, a driver's seat 11 is mounted on the rear frame 2b, and a blower transmission case 21 and a blower 16 are attached to the intermediate frame. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a riding lawn mower in which a mower for performing ground work such as lawn mowing is disposed below a vehicle body.

A so-called front mower type riding lawn mower in which a mower of a ground working machine is mounted on the front side of the vehicle body is known from Japanese Patent Laid-Open No. 63-98313. This riding lawn mower is configured such that turf grass cut by a mower is sent to a blower via a shooter and further collected from the blower via a duct to a collector at the rear of the vehicle body.
JP 63-98313 A EP0745316 (B1)

  In the riding lawn mower as described above, the present invention is intended to increase the support strength of the blower for transporting turfgrass while simplifying the machine structure.

  The invention of claim 1 includes a high-order front frame (2a) having a wide left-right width and a traveling body (2) disposed on the front side, and a low-order rear frame (2b) having a narrow left-right width disposed on the rear side. When the front frame (2a) and the rear frame (2b) are joined by a plate-shaped intermediate frame (36), the front and rear frames (2a) are joined to the intermediate frame (36). , (2b) are joined and fixed in a state of being shifted in the vertical direction and the horizontal direction with the center line in the left-right direction aligned, and the engine (12) is mounted on the front frame (2a), and the rear part A riding lawn mower is characterized in that a cockpit (11) is mounted on the frame (2b), and a blower transmission case (21) and a blower (16) are attached to the intermediate frame (36).

  According to the said structure, with respect to a plate-shaped intermediate frame (36), the front part (2a) with the wide left-right width | variety of a front side part, and the low-order rear frame (2b) with a narrow left-right width | variety of a rear side part are The ends of the front and rear frames (2a) and (2b) are joined and fixed in a state where they are shifted in the vertical and horizontal directions with the center line in the left and right direction being aligned, and the engine (12) is attached to the front frame (2a). , The cockpit (11) is mounted on the rear frame (2b), and the blower transmission case (21) and the blower (16) are mounted on the intermediate frame (36).

  According to a second aspect of the present invention, a distribution transmission shaft (22) to which power is transmitted from the engine (12) is mounted under the blower transmission case (21), and the blower belt transmission is transmitted from the distribution transmission shaft (22). The riding lawn mower according to claim 1, characterized in that power is transmitted to the blower (16) via the gear transmission (21a) in the device (24) and the blower transmission case (21). To do.

  According to said structure, in addition to the said effect | action of invention of Claim 1, the motive power of an engine (12) is transmitted to the distribution transmission shaft (22) pivoted on the lower part of the blower transmission case (21), and also a blower It is transmitted to the blower (16) via the belt transmission (24) and the gear transmission (21a) in the blower transmission case (21).

  The invention of claim 1 makes the plate-shaped intermediate frame (36) strong over a wide range in the vertical direction and the horizontal direction, and can increase the support strength of the blower transmission case (21) and the blower (16). Moreover, the plate-shaped intermediate frame (36) that connects the front frame (2a) and the rear frame (2b) can be used as a mounting member for the blower transmission case (21) and the blower (16), and the number of parts can be reduced. It is possible to reduce the cost.

  In addition to the above-described effect of the first aspect of the invention, the transmission structure from the engine (12) to the blower (16) can be strengthened.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is an overall side view of the riding lawn mower 1, FIG. 2 is a plan view of the front side thereof, FIG. 3 is a perspective view of the front side thereof, and FIG. 4 is a front view of the differential case.

  A mower having left and right front wheels 3, 3 and left and right rear wheels 4, 4 on the front side and rear side of the traveling machine body 2 of the riding lawn mower 1, and having left and right rotary cutting blades below the front side part of the traveling machine body 2. 6 is provided to be movable up and down. A steering column 8 is erected on the floor 7 above the front side of the traveling machine body 2, a steering handle 9 is provided above the steering column 8, and an operation panel 10 is provided below the steering handle 9. Further, a cockpit 11 is provided behind the handle 10, an engine 12 is provided behind the cockpit 11 and covered with a hood 13, and a collector 14 is provided above the hood 13.

  A blower case 16 a with a blower 16 is disposed behind the cockpit 11, and the upper portion of the blower case 16 a and the collector 14 are connected by a duct 17. Further, a rearwardly inclined shooter 18 is disposed between the blower 16 and the mower 6 in a side view. Thus, the turf grass cut by the mower 6 is sent to the blower 16 through the shooter 18 from the outlet at the center of the rear of the mower deck 6 a, and further conveyed by air to the collector 14 through the duct 17.

Next, the transmission configuration of the riding lawn mower 1 will be described.
An output shaft 12a of the engine 12 is projected forward, a blower transmission case 21 is attached to the rear side of the blower case 16a, and a lower portion of the blower transmission case 21 is connected from the output shaft 12a on the engine 12 side via a universal joint 23. Power is transmitted to the distribution transmission shaft 22 pivoted on the power transmission, and the power is transmitted from the distribution transmission shaft 22 to the blower 16 via the blower belt transmission device 24 and the gear transmission device 21 a in the blower transmission case 21.

  Further, the traveling power is distributed from the distribution transmission shaft 22 via the traveling belt transmission device 25 and transmitted to the hydraulic pump shaft 26c of the hydraulic pump 26a of the continuously variable transmission (HST) 26 provided below the blower 16, The hydraulic motor 26a is shifted by a tilting movement of a trunnion shaft (not shown).

  Further, the hydraulic pump 26a and the hydraulic motor 26b of the continuously variable transmission 26 are provided on the left and right below the blower 16, and the hydraulic motor shaft 26d of the hydraulic motor 26b is disposed in the center of the left and right of the traveling machine body 2 in plan view. Power is transmitted from the hydraulic motor shaft 26d to a traveling transmission shaft (not shown) that is aligned with the center of the shaft, and is further transmitted to the left and right rear wheels 4 and 4 via a differential mechanism (not shown).

  In addition, a differential case 27 is disposed in front of the continuously variable transmission 26, and left and right front wheel transmission cases 28, 28 extend forward from both left and right sides of the differential case 27, and left and right front wheels are disposed at the lower ends of the left and right front wheel transmission cases 28, 28. 3 and 3 are pivoted. The front end of the hydraulic motor shaft 26d of the hydraulic motor 26b extends into the differential case 27, and the gear transmission 27a in the differential case 27, the differential mechanism 27b, and the front wheel gears in the left and right front wheel transmission cases 28, 28 are extended from the hydraulic motor shaft 26d. Power is transmitted to the left and right front wheels 3, 3 via the transmission devices 28a,.

Next, the transmission configuration to the mower 6 will be described.
The mower deck 6a of the mower 6 is constructed such that a pair of left and right cutting blades 6b and 6b are pivoted around the vertical axis, and the cutting blades 6b and 6b are rotated in reverse to discharge the turf grass from the rear central outlet to the rear. is doing. A PTO case 31 is attached to the right side of the differential case 27 so as to protrude forward, a PTO shaft 32 is mounted on the PTO case 31 so as to protrude forward, and a PTO input is input from a gear transmission 27a in the differential case 27. Power is transmitted to the PTO shaft 32 via the shaft 31a, gears 31b, 31c, and 31d, and a PTO universal joint 33, mower input shaft 6c, and mower transmission device (not shown) in the mower deck 6a are further transmitted from the PTO shaft 32. Power is transmitted to the cutting blades 6b and 6b via the relay. The shaft that supports the intermediate gear 31c constitutes clutch means.

Next, the structure of the riding lawn mower 1 will be described with reference to FIGS.
The traveling machine body 2 is divided into a high-position front frame 2a having a wide left-right width on the front side and a low-position rear frame 2b having a narrow left-right width on the rear side, and the front frame 2a and the rear frame 2b Are joined by a plate-like intermediate frame 36. When joining, the center line in the left-right direction is aligned and the rear lower part of the front frame 2a and the front upper part of the rear frame 2b are partially overlapped with each other in the vertical direction. Both ends are arranged on the left and right outer sides, and the left and right outer sides of the rear frame 2b are arranged closer to the center, for example, by welding.

  The cockpit 11 and the fender 15 are attached above the rear side of the front frame 2a, and the continuously variable transmission 26, the differential case 27, and the left and right front wheel transmission cases 28, 28 are supported in a suspended manner below the rear side. The floor 7 is attached to the upper surface of the front side portion.

  Further, an inner frame 2c is integrally attached to an inner lower portion of the rear frame 2b, and the engine 12 is mounted on the inner frame 2c via a rubber mount (not shown). Further, the lower part of the blower transmission case 21 is attached with bolts and nuts to the left and right central portions of the intermediate frame 36, and the blower 16 is provided on the upper front side of the blower transmission case 21. As shown in FIG. 9B, a mounting portion 21a is integrally formed on the lower outer periphery of the blower transmission case 21, and the mounting portion 21a is fixed to the plate-like intermediate frame 36 with bolts and nuts. ing.

  According to the above configuration, the plate-like intermediate frame 36 that connects the front frame 2a and the rear frame 2b can be used as a mounting member for the blower transmission case 21 and the blower 16, thereby reducing the number of parts and reducing the cost. Can be planned. Further, the left and right sides of the wide front frame 2a are connected to the left and right sides of the intermediate frame 36, and the left and right ends of the narrow rear frame 2b are connected to the center while being shifted in the vertical direction. Therefore, the plate-like intermediate frame 36 can be made strong over a wide range, and the support strength of the blower transmission case 21 and the blower 16 can be increased.

  A distribution transmission shaft 22 to which power is transmitted from the engine 12 is mounted under the blower transmission case 21, and the power transmitted to the distribution transmission shaft 22 is transmitted to the blower belt transmission device 24 and the gears in the blower transmission case 21. Since the transmission is transmitted to the blower 16 via the transmission device 21a, the transmission configuration from the engine 12 to the blower 16 can be strengthened.

Next, the support structure of the differential case 27, the left and right front wheel transmission case 28, and the PTO case 31 will be described with reference to FIGS.
A differential case 27 is disposed in front of the continuously variable transmission 26, and left and right front wheel transmission cases 28, 28 are attached to the left and right sides of the differential case 27 so as to extend obliquely downward toward the front. Further, the PTO case 31 is attached so as to extend forward from the right front portion of the differential case 27, and the right side surface of the PTO case 31 and the inner side surface of the right front wheel transmission case 28 are brought close to each other. Further, the power transmitted to the PTO input shaft 31a of the PTO case 31 is configured to be transmitted to the PTO shaft 32 via the gears 31b, 31c, 31d, and a dedicated work position in which the PTO case 31 is rotated rightward. The general-purpose work position rotated from the center is adjustable.

  A reinforcing plate 37 is provided so as to cover the lower side of the PTO case 31, and left and right mounting plates 37a and 37a are attached to the left and right sides of the reinforcing plate 37 so as to be movable in the left and right directions, and the left and right mounting plates 37a and 37a are attached. It is detachably attached to the left and right front wheel transmission cases 28, 28 by bolts 37b.

  According to the above configuration, since the left and right front wheel transmission cases 28 and 28 are connected by the reinforcing plate 37, the support strength of the left and right front wheel transmission cases 28 and 28 can be increased, and the PTO case 31 is protected by the reinforcing plate 37. can do.

  Next, the fender 15 disposed around the cockpit 11 will be described with reference to FIGS. The fender 15 includes a planar cockpit seat mounting portion 15a at the front left and right central portions, a high planar fuel tank covering portion 15b at the rear left and right central portions, a left operation panel portion 15c convex in the front-rear direction of the left side, The right operation panel 15d is convex in the front-rear direction of the right side.

  The cockpit mounting portion 15a is provided with a hole 40 for attaching the cockpit 11, the fuel tank covering portion 15b is provided with a fuel cap hole 41, the left operation panel portion 15c is provided with a parking lever hole 42, and a collector lifting / lowering. A lever hole 43, a collector opening / closing lever hole 44, and a cup holder hole 45 are provided. The cup holder hole 45 is provided with a drain hole 45 a. The right operation panel 15d is provided with a mower elevating lever hole 46, a main transmission lever hole 47, and an auxiliary transmission lever hole 48.

  Further, a concave cup holder hole 45 is formed in the rear part of the left operation panel portion 15c convex in the front-rear direction, and a drain hole 45a is formed in the front side portion of the hole 45, and the rear of the drain hole 45a. Is configured with a rib 45b for closing the convex lower space.

  According to the above configuration, the fender 15 can be firmly configured by the ribs 45b, and the ribs 45b prevent water and garbage falling from the drain holes 45a of the cup holder holes 45 from moving backward. The water and dust mixed with the cooling air of the engine 12 (indicated by an arrow in FIG. 12B) can be prevented from flowing to the engine 12 or the radiator side.

Next, based on FIGS. 12 and 14, a description will be given of a shared configuration of a plurality of types of fenders 15.
For example, a large fender 15 is configured as shown in FIG. Based on the large fender 15 of FIG. 12, a small fender 15 is configured as shown in FIG. That is, based on the shape of the fender 15 shown in FIG. 12, most of the fender 15 is shared, and a detailed special configuration that is not shared is configured by a nested type.

  That is, since the planar cockpit seat mounting portion 15a at the front center of the left and right has the same configuration, there is no additional processing, and the shooter hole 49 and the fuel are inserted into the planar fuel tank covering portion 15b at the rear center of the left and right by nesting. The tank cap hole 50 is additionally processed. Further, a small operation hole 51 is additionally processed by a nesting type in the right operation panel 15d convex in the front-rear direction on the right side, and a small size is provided in the left operation panel part 15c convex in the front-rear direction on the left side. A parking lever hole 42, a collector lift lever hole 43, and a collector opening / closing lever hole 44 corresponding to the above are additionally processed by a nested mold.

  According to the above-described configuration, when molding a plurality of small and large fenders 15, a plurality of fenders can be molded by sharing one punching die and partially performing additional processing with a nested die. Can be reduced.

Next, an open / close locking configuration of the bonnet 13 will be described based on FIGS. 12, 13, and 15.
A bonnet 13 that covers the engine 12 is provided behind the fender 15, and the rear end of the bonnet 13 is supported so as to be freely openable and closable around an axis in the left-right direction. In the closed state of the bonnet 13, as shown in FIG. The front end of the bonnet 13 and the rear end of the fender 15 are configured to approach each other. The left and right rear ends of the fender 15 are provided with left and right engaging portions 15k and 15k, and the bonnet 13 is provided with engaging portions 13a and 13a on the inside of the left and right front lower ends. 15k, 13a and 13a are configured to face each other in the closed state. In addition, left and right hooks 57 and 57 are rotatably supported by a left and right shaft 56 at the rear lower portion of the fender 15, and the left and right hooks 57 and 57 are pressed against the shaft 56 by a locking spring 59. The lever 58 is attached to the shaft 56.

  13, when the lever 58 is operated counterclockwise against the locking spring 59 and the hook 57 is locked by the spring force of the lock member 60, the hooks 57 and 57 are engaged. The bonnet 13 can be released by disengaging from the stop portions 15k, 15k, 13a, 13a. Further, when the bonnet 13 is closed and the lever 58 is released from the lock member 60, the hooks 57 and 57 are returned and rotated by the pressing force of the locking spring 59, and the locking portions 15k, 15k, 13a and 13a are locked. The bonnet 13 is locked to the fender 15.

Next, a specific configuration of the operation panel 10 will be described based on FIG.
The operation panel 10 has a substantially semicircular shape, and includes an hour meter 61 at the upper left and right centers, a fuel gauge 62 on the left side, and a water temperature gauge 63 on the right side. Left and right arrow shapes 64, 64 are formed on the left and right sides of the upper and lower intermediate portions, a left blinker arrow 64 L and a battery display 65 are provided in the left arrow shape 64, and a right blinker arrow 64 R, A blinker display 66, a light display 67, and the like are provided.

  Further, a handle hole 68 is provided in the lower left and right central portion of the operation panel 10, a blinker operation lever 69, a light switch 70, a front washer switch switch 71 and the like are provided on the left side, and an engine starter is provided on the right side thereof. A key switch hole 72 and a PTO switch 73 are provided.

  According to the above configuration, by arranging the left and right blinker arrows 64L and 64R in the left and right arrow shapes 64 and 64, it is easy to understand the blinker display even if these displays are reduced, and the entire operation panel 10 can be made smaller. .

Side view of riding lawn mower Plan view of the front side of the riding lawn mower Perspective view of the front side of a riding lawn mower Front view of the front side of the riding lawn mower Side view of riding lawn mower A plan view of the lawn mower partially omitted Rear view of the fuselage Rear view of blower part (A) Cut side view of blower part, (B) Perspective view of blower transmission case Front view of front wheel transmission case Side view of front wheel transmission case (A) Plan view of fender, (B) Side view of fender, (C) Front view of fender, (D) Cut front view of rear side in fender plan view, (E) Front-rear direction intermediate portion in fender plan view Cutaway front view, (F) cut front view of front side in fender plan view Fender side view (A) Top view of fender, (B) Back view of fender Top view of fender and bonnet Front view of the operation panel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Riding lawn mower 2 Traveling machine body 2a Front frame 2b Rear frame 11 Pilot seat 12 Engine 16 Blower 21 Blower transmission case 22 Distribution transmission shaft 24 Blower belt transmission device 36 Intermediate frame

Claims (2)

  The traveling machine body (2) is divided into a high-order front frame (2a) that is disposed on the front side and has a wide left and right width, and a low-order rear frame (2b) that is disposed on the rear side and has a narrow left-right width. When the part frame (2a) and the rear frame (2b) are joined by the plate-shaped intermediate frame (36), each of the front and rear frames (2a), (2b) is connected to the intermediate frame (36). The ends are joined and fixed in a state where they are shifted in the vertical direction and the horizontal direction with the center line in the left-right direction aligned, the engine (12) is mounted on the front frame (2a), and the rear frame (2b) is steered. A riding lawn mower having a seat (11) and a blower transmission case (21) and a blower (16) attached to the intermediate frame (36).   A distribution transmission shaft (22) to which power is transmitted from the engine (12) is mounted under the blower transmission case (21), and a blower belt transmission device (24) and a blower transmission are transmitted from the distribution transmission shaft (22). 2. The riding lawn mower according to claim 1, wherein power is transmitted to the blower (16) via a gear transmission (21a) in the case (21).

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