JP2007159518A - Riding lawn-mowing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding lawn-mowing machine which can smoothly transmit a power of an engine to a mower without connecting a cutter-driving PTO shaft of the mower to a driving shaft of the mower with a drive belt and a pulley. <P>SOLUTION: This riding lawn-mowing machine comprises a travel driving system B from an engine 12 for driving wheels 3, 4, and a blower-driving system A for transmitting a power from the engine 12 to a blower 23 for blowing and conveying cut lawn grasses through a chute 27 disposed in the center of the machine frame, wherein the travel driving system B comprises a case 15 used for gear transmission and disposed in a form spanning the chute 27, and a gear transmission system in a pair of portal type axle cases 32, 32 for driving wheels 4, 4 disposed on both the sides of the case 15, and the blower-driving system A has a mower-driving PTO shaft 38 for transmitting a power to a mower 6-driving shaft 40 disposed between the chute 27 and one axle case 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a riding lawn mower in which a mower that performs ground work such as lawn mowing is mounted below a vehicle body.

Japanese Patent Application Laid-Open No. 63-98313 discloses a so-called front mower type riding lawn mower in which a lawn mower (moor), which is a typical example of a ground working machine, is mounted on the front of a vehicle body. This riding lawn mower collects turf grass cut by a mower on a collector at the rear of the vehicle body via a shooter and a duct. A transmission that shifts the power from the engine is used to drive the blower and the vehicle body that are provided to air-carry the turf grass cut to the collector.
JP 63-98313 A EP0840998 (B1) Patent Specification

  In the riding lawn mowers of the inventions described in Patent Documents 1 and 2, the PTO shaft driven by engine power is arranged at the center of the fuselage. For this reason, when the mower blades are arranged in two left and right positions and are rotated in the reverse direction to discharge the mowing grass backward from the left and right center of the mower, there is a problem of interfering with the discharge guide cylinder portion to the collector. is there. In order to avoid this, a configuration in which the input shaft of the driving force from the engine is directed in front of the mower can be considered, but in the so-called front mower configuration, the configuration of the driving force input mechanism from the front side of the mower becomes complicated, and the driving This is impossible because the force transmission mechanism tends to be insufficient in strength.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a riding lawn mower capable of smoothly transmitting the power on the engine side to the mower without connecting the mower cutter driving PTO shaft and the mower driving shaft with a driving belt and a pulley. Is to provide.

The above-mentioned problem of the present invention is solved by the following solution means.
According to the first aspect of the present invention, turfgrass is produced by a traveling drive system (B) for transmitting power from the engine (12) to drive the wheels (3, 4) provided on the airframe and the cutter (5, 5). A blower drive system (A) for transmitting power from the engine (12) to a blower (23) for blowing and conveying the turf grass cut by the mower (6) for cutting through a shooter (27) provided in the center of the machine body; The travel drive system (B) includes a continuously variable transmission (HST) (19), a transmission system in a gear transmission case (15) provided in a shape straddling the shooter (27), And a transmission system in a pair of portal type axle cases (32, 32) for driving the wheels (4, 4) provided on both sides of the case (15), and the blower drive system (A) is an HST (19 ) Pump shaft (28a) A riding lawn mower having a transmission system for transmitting a PTO shaft for mower drive provided between the et power the chute (27) and one of the axle case (32) (38).
In addition, in the riding lawn mower of the present invention, the cutters (5, 5) can use one or more, three, or quadruple type.

  According to a second aspect of the present invention, the shooter (27) is detachably provided, and the PTO shaft (38) for driving the mower is attached to a PTO case (37) that supports the PTO shaft (38). The shaft (38) and the PTO case (37) are configured to be able to swing left and right about the continuously variable transmission (HST) pump shaft (28a) with respect to the airframe, and the mower (6) and the shooter (27) are airframed. The riding lawn mower according to claim 1, wherein the lawn mower can be moved to the left and right center portion side of the machine body by being removed from the vehicle.

  According to the first aspect of the present invention, a universal joint (46) is provided between the shooter (27) and one axle case (32) from the PTO shaft (38) at a position shifted in the left-right direction from the center of the airframe. The power can be transmitted to the input shaft (40) of the mower (6) via power transmission means such as), so that an unreasonable load is not applied to the universal joint (46).

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the mower (6) and the shooter (27) are removed, and a general work machine such as a snowplow or a road cleaner is installed in the center of the machine body. It can be operated without difficulty by power transmission from.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a side view of a riding lawn mower in which a mower is attached to the tractor of this embodiment. In the present invention, the left and right directions in the forward direction of the lawn mower are referred to as the left side and the right side, respectively, the forward direction is referred to as the front side, and the reverse direction is referred to as the rear side.

  A front wheel 3 and a rear wheel 4, 4 are provided at the front and rear of the traveling vehicle body 2, respectively, and a mower 6 for lawn mowing having a pair of left and right cutters 5 is provided below the front of the vehicle body 2 so as to be movable up and down. It is done. A steering column 8 is erected on the floor 7 above the front portion of the vehicle body 2, and a handle 10 is provided on the top of the column 8. A cockpit 11 is provided behind the steering wheel 10, and a hood 34 that covers the engine 12, the radiator 9, and the like is disposed behind the cockpit 11, and a collector 14 is provided above the hood 34. .

  As shown in the side view of FIG. 1, the riding lawn mower 1 of the present embodiment has the front end of the front mower 6 for rear wheel steering and the front end of the floor 7 arranged at substantially the same front and rear positions in a side view of the lawn mower. The seating positions of the axle 3a and the operator's cockpit 11 are also arranged at substantially the same front and rear positions in a lawn mower side view.

  If the front end of the floor 7 is too far ahead of the front end of the mower 6, turf grass can be left uncut, and if the front end of the floor 7 is too far behind the front end of the mower 6, it is difficult to align the turf grass. Furthermore, if the front end of the floor 7 and the front end of the mower 6 are substantially in the same front-rear position when viewed from the side of the lawn mower, the distance between the obstacle and the mower 6 can be easily understood when moving forward at the wall, etc. good.

  The mower 6 is configured such that an end portion thereof is rotatably attached to the vehicle body 2 (for example, a front end portion of an axle case 32 described later), and a front side thereof is vertically movable up and down.

  A blower case 24 with a blower 23 is disposed in the lower rear part of the cockpit 11, and the blower 23 is operated by the output of the engine 12. A turfgrass transport duct 26 that connects the blower case 24 and the collector 14 is provided above the blower case 24. Further, a shooter 27 that is shaped to rise after side view is disposed between the blower 23 and the mower 6, and the turf grass cut by the mower 6 passes through a discharge port at the rear center of the deck 6 a and has a short cylindrical guide guide portion and The end portion is superposed on the guide portion and is sent to the blower 23 via the shooter 27 provided so as to be able to be bent, and is conveyed to the rear collector 14 via the duct 26. It is noted that the wind is generated by the rotation of the cutter 5 of the mower 6, and the mowing grass is conveyed in the shooter 27 by the generated wind and the blower wind, and is further conveyed in the duct 26 by the blower wind and reaches the collector 14.

The operation mechanism of the lawn mower provided with the above-described schematic members will be described.
The output shaft 12a of the engine 12 is extended to the front of the engine 12, and the output shaft 12a and a power distribution pulley shaft 30 (FIG. 1) provided to be supported by a blower case 25 described later are connected via the universal joint 13. The power distribution pulleys 31a and 31b fixed to the power distribution pulley shaft 30 include a pair of pulleys 31a and 31b that distribute power to the blower drive system A and the travel drive system B, respectively. The blower drive system A is the power distribution shaft. The power is received from the pulley 31a by a pulley 36 integrated with a blower drive pulley shaft 33 provided in the blower transmission case 25 above 30 and the blower 23 is driven via the gear mechanism 25a in the blower transmission case 25. . On the other hand, the travel drive system B is provided below the power distribution shaft 30 and drives an HST drive pulley 29 integrated with a hydraulic pump shaft 28a (FIG. 2) of a continuously variable transmission (HST) 19 comprising a pump 28 and a motor 35. Thus, the HST motor is configured to obtain a predetermined rotation by operating a trunnion shaft (not shown) in conjunction.

Further, as will be described later, the HST lever 19 is disposed in such a relationship that the hydraulic pump 28 and the hydraulic motor 35 are provided side by side, so that a space can be formed above the HST lever 19, which is convenient for the arrangement of the blower case 24. As described above, since the blower case 24 and the HST 19 are arranged at positions where they overlap each other in the vertical direction, the guide duct 27 from the mower 6 can be shortened as compared with that of a conventional riding lawn mower.
Note that power transmission may be performed by a chain or gear instead of the pulley group.

  The blower drive system A is transmitted power from the blower drive pulley shaft 33 to the blower rotary shaft 20 by a gear mechanism 25 a provided in a blower transmission case 25 adjacent to the rear of the blower case 24. The blower driving pulley shaft 33 and the blower rotating shaft 20 are supported on both side walls of the blower transmission case 25. Moreover, since the rotating shaft 30 of the power distribution pulleys 31a and 31b is also supported by the blower transmission case 25, the support structure of the power distribution pulleys 31a and 31b is simplified.

  Further, as shown in the plan view of the main part of FIG. 2, the HST 19 has a hydraulic pump 28 and a hydraulic motor 35 arranged in parallel, and the hydraulic motor shaft 35a is used instead of the hydraulic pump shaft (HST input shaft) 28a. The drive shaft of the rear wheel 4 is coaxial with the hydraulic motor shaft 35a of the HST 19 (see FIG. 1). For this reason, the drive system of the rear wheel 4 is simplified, and it is not necessary to use a universal joint at the connecting portion between the rear wheel drive shaft and the hydraulic motor shaft 35a of the HST 19, and a simple power transmission mechanism is obtained.

  In addition, as shown in FIG. 1, a connection surface between the differential case 15 and the HST 19 is disposed below the blower case 24, and an extended line of the boundary line between the differential case 15 and the HST 19 passes through the front and rear intermediate portions of the blower case 24. Yes. For this reason, the HST 19 can be disposed below the blower case 24, and the belt can be easily hung between the power distribution pulley 31b and the HST drive pulley 29.

  In the differential case 15, a bevel gear mechanism 15a (including gears 15a1 to 15a4) and a differential mechanism 15b (including gear 15b1) that are linked to the hydraulic motor shaft 35a from the side close to the HST 19 are disposed in the front and rear. Since the upper surface side of the side wall surface is formed to be the inclined surface 15c, the inclined surface 15c can be along the lower surface of the shooter 27, and the shooter 27 can be easily arranged.

  Further, as shown in FIG. 1, a blower 23 is disposed at a substantially middle portion in the vertical direction between the deck 6a of the mower 6 and the outlet 26a of the duct 26 on the collector 14 side in the height direction. Thus, the suction force of the turfgrass cut by the mower 6 of the blower 23 and the discharge force of the turfgrass to the collector 14 can be made substantially the same, so that the turfgrass transfer efficiency of the blower 23 is improved as compared with the prior art, and the blower rotation speed is relatively high. As a result, the noise of the blower 23 can be reduced.

  FIG. 3 shows a perspective view of the turfgrass conveyance section from the mower 6 to the blower case 24, and FIG. 4 shows a front view of the vicinity of the differential case 15. As shown in these drawings, the gear-type traveling device in the differential case 15 includes a front-wheel drive gear transmission mechanism and a PTO having a three-axis gear transmission configuration (32a to 32c) in a pair of axle cases 32 integral with the differential case 15. A gear transmission mechanism to the mower drive PTO shaft 38 in the case 37 is provided. As shown in FIG. 3, the central differential case 15 and the left and right axle cases 32 constitute a portal case, and the shooter 27 can be disposed below the differential case 15.

  Further, as shown in the front view of the differential case 15 in FIG. 4, the hydraulic pump shaft 28 a of the HST 19 is extended into the PTO case 37 so that power can be input. The rotation of the pump shaft 28a is transmitted to the PTO shaft 38 through the intermediate transmission shaft 39 of the transmission gear group. The PTO shaft 38 is disposed in a space D formed between the axle case 32 and the shooter 27. Further, the PTO case 37 can be rotated in the direction of arrow A around the shaft 28a by releasing the connection with the differential case 15, and can be fixedly fastened with the shaft center disposed at the center of the machine body. With this configuration, at least the mower 6 and the shooter 27 can be removed to equip a work machine (such as a snowplow) described later for transmission.

Next, the transmission structure of the mower 6 will be described. Form which has a pair of left and right cutters 5 and forms a weed opening at the center of the rear of the mower 6 which rotates in opposite directions, arranges a shooter 27 at the center of the machine body, and guides the weed toward the collector 14 at the rear by the blower 23 The transmission structure to the mower 6 includes a front mower (which is a configuration disclosed in the present specification and configured to transmit transmission from the rear side of the mower), and a mid mower (provided to move up and down on the abdomen of the tractor, and the collector 14 at the rear. And is configured to transmit power from the front side of the mower 6 because the engine 12 is mounted on the front portion.
Conventionally, the transmission structure is separately provided for the front mower and the midmoor, but the above structure is an improved structure.

  5 to 7, the power transmission is transmitted from the PTO shaft 38 to the mower drive shaft 40 via the universal joint 46 (FIGS. 2 and 3). A bevel gear 71 is provided at the end of the mower drive shaft 40, and two bevel gears 74 and 75 are provided on the horizontal shaft 76A in a back-to-back manner between the upper end bevel gear 73 of one of the left and right rotary cutter shafts 72. It is configured to be housed in a bevel transmission case 77 and detachably fixed to the mower deck 78.

  The horizontal shaft 76A is provided with an intermediate transmission shaft 76C and couplings 76D and 76D, and is extended to a horizontal shaft 76B of a transmission case 80 that supports the other cutter shaft 79. Inside the case 80, a pair of bevel gears 81, 82 are provided. It is configured to be able to interlock with rotation. The transmission case 80 is also detachably fixed to the mower deck 78 in the same manner as the bevel transmission case 77. Cutters 83 and 84 are provided at the lower ends of the left and right rotary cutter shafts 72 and 79, respectively.

  With the configuration as described above, when the rotation in the arrow (A) direction is applied to the mower drive shaft 40, the left and right rotary cutter shafts 72 and 83 are rotated in the arrow (B) direction, and the other rotary cutter shaft is provided. 79 and the cutter 84 are given rotation in the direction of arrow (c).

  On the other hand, FIG. 8 shows a configuration in which a transmission mechanism to the mid mower 70 is incorporated. The transmission mechanism to the mid mower 70 shown in FIG. 8 includes the mower drive shaft 40, the bevel transmission case 77, the horizontal shafts 76A and 76B, the intermediate transmission shaft 76C, the transmission case 80, and the left and right cutter shafts 72 in the front mower 6 of FIG. 79, and the bevel gear group inside each case 77, 80 is removed from the mower deck 78, that is, the left and right transmission cases 77, 80 are removed from the mower deck 78 and used in the mid mower mechanism. ing.

  Note that the front mower 6 in FIG. 5 and the mid mower 70 in FIG. The front mower 6 receives power from the rear PTO shaft 38, while the mid mower 70 is provided with a PTO shaft (motor shaft 35 a) for taking out power at a position lowered from the front engine 12 by belt transmission downward. This is because the left and right relationships of the transmission cases 77 and 80 are reversed.

  In FIG. 8, the PMO shaft 90 of the mid mower 70 is input from the front side to the mower drive shaft 40 via the universal joint 91, while being input to the bevel transmission case 77 a and interlocked with the bevel gear 74 a. The bevel gear 74a is different from the arrangement configuration of the bevel gear 74 in the bevel transmission case 77 in FIG. 5 in the transmission case 77a. The configuration is the same as in FIG. Therefore, when rotation in the direction of arrow (d) is applied to the motor drive shaft 40, the rotary cutter shaft 72 and cutter 83 rotate in the direction of arrow (e), and the rotary cutter shaft 79 and cutter 84 rotate in the direction of arrow (f). To do.

  The reason why the bevel gear 74a is arranged as shown in FIG. 8 is in the rotation direction of the motor drive shaft 40 on the input side. When the bevel gear 74a is arranged as shown in FIG. 8, the transmission configuration of the front mower 6 shown in FIG. 5 can be used as it is.

  As described above, most of the left and right rotary cutter shafts 72 and 79 can be shared from the mower drive shaft 40, or if the rotations of the PTO shaft 38 and the PTO shaft 90 coincide with each other, it is possible to completely share the cost. Can be planned.

  Further, as shown in FIGS. 5 to 7, by arranging the two bevel gears 74 and 75, the thrust forces acting on the two bevel gears 74 and 75 are offset in opposite directions, and an unreasonable burden on the bearing is caused. This contributes to a longer life of the bearing 95. That is, a thrust force in the right direction of the paper is generated in the bevel gear 74 that is interlocked with the rotation from the mower drive shaft 40 side, while the bevel gear 75 is moved in the left direction of the paper as the rotary cutter shaft 72 of the mower 6 is driven. Since the thrust force acts, these thrust forces cancel each other, reducing an unreasonable burden on the bearing 95 located in the middle.

  Further, as shown in the side view of the tractor in FIG. 9 and the perspective view of the step portion in FIG. 10, the steering column 8 and the step 7 may be linked to each other so that the mower 6 can be easily flipped up.

  Step 7 of the airframe is divided into a main body side step 7a and a steering column side step 7b, and both are connected by a polygonal shaft 17 as shown in FIG. Protrusions 7d having polygon insertion holes 7c are provided at both ends of the machine side step 7a, the steering column side steps 7b are provided with insertion holes 7e of the polygon shaft 17, and the projections 7d of the machine side step 7a are inserted. A recessed portion 7f is provided.

  The convex part 7d of the machine side step 7a is inserted into the concave part 7f of the steering column side step 7b, and the polygon shaft 17 is inserted into the polygon insertion hole 7c and the insertion hole 7e. The inner peripheral shape of the polygon insertion hole 7c and the insertion hole 7e and the outer peripheral shape of the polygon shaft 17 are the same polygonal shape. At this time, if the polygon shaft 17 is inserted so as to pass through the polygon insertion hole 7c and the insertion hole 7e in a state where the steering column side step 7b is set to an angle at which the steering column side step 7b is desired to be attached, between the steps 7a and 7b. The desired mounting angle can be set. The polygon shaft 17 is provided with a retaining pin 17a and a gripping portion 17b at both ends.

  Since the steering column side step 7b is fixed at the position indicated by the two-dot chain line in FIG. 9 and can be separated from the transmission mechanism or the link mechanism with the airframe side of the mower 6, maintenance of the mower 6 can be performed. Easy to do.

  FIG. 11 shows a side view of the tractor when a snow remover 42 is installed instead of the mower 6. The snowplow 42 is connected to the fuselage by a support rod 44 provided via a pin 43a inserted through a bracket 43 below the front of the fuselage, and rods 45, 45 provided in a protruding state from the front of the left and right axle cases 32, respectively. is doing. When the snowplow 42 is driven, the PTO shaft 38 and the PTO shaft 38 are swung to the center of the machine body, the PTO shaft 38 is moved to the machine body center, and the PTO input shaft of the snowplow 42 is connected from the PTO shaft 38 through the universal joint 46. In this configuration, the power on the engine 12 side is transmitted to 42a.

  The snow remover 42 is configured to discharge the snow that has been brought to the left and right center sides by a known pair of snow collecting spirals 42b and 42b from the snow discharge cylinder 42d in the direction of arrow C by the rotation of the blower 42c.

  INDUSTRIAL APPLICABILITY The present invention is highly useful not only as a home and industrial riding lawn mower but also as other working machines such as a snowplow.

It is a principal part side view of the riding lawn mower of the Example of this invention. It is a principal part top view of the riding lawn mower of the Example of this invention. It is a perspective view which shows the structure between the mower and blower case of the riding lawn mower of FIG. It is a schematic front view of the differential case part of the riding lawn mower of FIG. It is a top view which shows an example of the transmission structure of the front mower of the riding lawn mower of the Example of this invention. It is the top view to which a part of transmission structure of FIG. 5 was expanded. It is the rear view which expanded a part of transmission structure of FIG. It is a top view which shows an example of the transmission structure of the midmoor of the riding lawn mower of the Example of this invention. It is a side view at the time of making the step of the riding lawn mower of the Example of this invention rotatable. FIG. 10 is a perspective view illustrating component assembly in the step of FIG. 9. It is a side view at the time of using the riding lawn mower of this invention as a snowplow.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Riding lawn mower 2 Traveling vehicle body 3 Front wheel 3a Front wheel axle 4 Rear wheel 5 Cutter 6 Moore 6a Deck 7 Floor 7a Machine side step 7b Steering column side step 7c Polygon insertion hole 7d Convex part 7e Insertion hole 7f Concave part 8 Steering column 9 Radiator 10 Handle 11 Pilot seat 12 Engine 12a Engine output shaft 13 Universal joint
14 collector 15 differential case 15a bevel gear mechanism 15a1 to 15a4, 15b1 gear 15b differential mechanism 15c inclined surface 17 polygon shaft 17a retaining pin 17b gripping part 19 HST
20 Blower Rotating Shaft 23 Blower 24 Blower Case 25 Blower Transmission Case 25a Gear Mechanism 26 Duct 26a Duct Outlet 27 Shuter 28 Hydraulic Pump 28a Hydraulic Pump Shaft 29 HST Drive Pulley 30 Power Distribution Pulley Shafts 31a, 31b Power Distribution Pulley 32 Axle Case 32a ~ 32c Three-shaft gear transmission configuration 33 Blower drive pulley shaft 34 Bonnet 35 Hydraulic motor 35a Hydraulic motor shaft 36 Pulley 37 PTO case 38 PTO shaft 39 Intermediate transmission shaft 40 Moore drive shaft 42 Snow removal machine 42a Input shaft 42b Snow collecting spiral 42c Blower 42d Release Snow tube 43 Bracket 43a Pin 44 Support rod 45 Rod 46 Universal joint 70 Mid mower 71 Bevel gear 72, 79 Cutter shaft 73, 74, 74a, 75 Bevel gear 76A, 76B Horizontal shaft 76C Intermediate transmission shaft 76D Coupling 77, 77a Bevel transmission case 78 Moore deck 80 Transmission case 81, 82 Bevel gear 83, 84 Cutter 90 PTO shaft 91 Universal joint 95 Bearing A Blower drive system B Travel drive system D Space

Claims (2)

A driving system (B) for transmitting power from the engine (12) to drive the wheels (3, 4) provided on the airframe, and a mower (6) for cutting turf grass with the cutters (5, 5). In a riding lawn mower equipped with a blower drive system (A) for transmitting power from an engine (12) to a blower (23) that blows and conveys turf grass after cutting through a shooter (27) provided in the center of the fuselage,
The travel drive system (B) is provided on a continuously variable transmission (19), a transmission system in a gear transmission case (15) provided in a shape straddling the shooter (27), and on both sides of the case (15). And a transmission system in a pair of portal type axle cases (32, 32) for driving the wheels (4, 4),
The blower drive system (A) is a PTO for mower drive in which power from a pump shaft (28a) provided in a continuously variable transmission (19) is provided between a shooter (27) and one axle case (32). A riding lawn mower comprising a transmission system for transmission to a shaft (38).   The shooter (27) is detachably provided, and the mower drive PTO shaft (38) is attached to a PTO case (37) that supports the PTO shaft (38), and the PTO shaft (38) and the PTO case ( 37) with respect to the fuselage so that it can swing left and right around the continuously variable transmission pump shaft (28a), and the mower (6) and the shooter (27) are removed from the fuselage, thereby making the left and right central part of the fuselage The riding lawn mower according to claim 1, wherein the riding lawn mower is configured to be able to be moved and arranged.

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