JP2008206468A - Riding lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding lawn mower which is downsized by relatively simplifying a power transmission system to a mower driving system and a traveling system. <P>SOLUTION: The riding lawn mower comprises: traveling transmission systems 31, 35, 36 which transmit power from an engine crank pulley 23 by a transmission shaft 27 etc., provided along a longitudinal direction on either of the right and left sides of a vehicle body 2, and which transmit power from a longitudinal shaft 30 of a counter transmission case 29 to a rear traveling speed change gear 33; and mower transmission systems 41, 42, 44, 45, 53, 54a and 54b which are provided ahead of the counter transmission case 29, and which transmit output from a lateral shaft 40 of the counter transmission case 29. The power can be outputted in such a manner as to branch off into both the traveling transmission systems 31, 35 and 36 and the mower transmission systems 41, 42, 44, 45, 53 and 54 via the counter transmission case 29 without voluminousness and without the need for the arrangement of engine power transmission systems 24, 25 and 27 in the upper space of the mower 7. Thus, the transmission constitution can be simplified. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a riding lawn mower.

  Conventionally, a mower deck that covers two cutting blades can be moved up and down on the abdomen of a traveling vehicle body with front and rear wheels, and a collector for collecting grass is attached to the rear of the traveling vehicle body, and the mower deck and collector are connected via a shooter. Riding lawn mowers connected to each other are known.

  In Japanese Patent Laid-Open No. 2005-237218, the power transmission to the mower is performed from the crank pulley of the engine toward the lower side of the engine, and the power transmission to the traveling system is performed by a hydrostatic pressure by an output shaft that outputs rearward from the engine. It is disclosed that it is carried out to a type continuously variable transmission (sometimes referred to as HST).

Japanese Patent Laid-Open No. 2006-6168 discloses a configuration in which an output shaft that outputs driving force from the engine to the rear is transmitted to the transmission case, and output is transmitted from the transmission shaft to the traveling system and the mower drive system, respectively. ing.
JP-A-2005-237218 JP 2006-6168 A

In the riding lawn mower described in Patent Documents 1 and 2 above, a configuration using a transmission shaft and a gear mechanism is adopted for the power transmission system that transmits the power from the engine separately to the mower drive system and the traveling system. ing.
However, the power transmission system to the mower drive system is relatively complicated, and miniaturization of the riding lawn mower is not at a satisfactory stage.
SUMMARY OF THE INVENTION An object of the present invention is to provide a riding lawn mower with a relatively simplified power transmission system to a mower drive system and a traveling system.

  The invention according to claim 1 includes an engine (6) provided at a front portion on a traveling vehicle body (2), a traveling transmission device (33) provided at a rear portion on the traveling vehicle body (2), and a pair of right and left A mower (7) provided on the abdomen of the traveling vehicle body (2) having front and rear wheels (3, 4), and a collector (10) for collecting grass attached to the rear of the traveling vehicle body (2); A lawn mower equipped with a shooter (13) that connects (7) and a collector (10) along the front-rear direction of the left and right sides of the vehicle body (2) that transmits power from the engine (6) The engine power transmission system (24, 25, 27) provided and the power from the engine power transmission system (24, 25, 27) is input and output to the vertical axis (30) and the horizontal axis (40). Counter transmission case (29) provided on the vertical axis of the counter transmission case (29) 0) to the transmission (33) for traveling and the output from the horizontal axis (40) of the counter transmission case (29) to the mower (7). It is a riding lawn mower provided with a mower transmission system (41, 42, 44, 45, 53, 54a, 54b) for transmission.

  According to the second aspect of the present invention, the counter transmission case (29) and the traveling transmission (33) are arranged on one side of the left or right side of the vehicle body (2), and the other of the left and right sides of the vehicle body (2) is arranged. The riding lawn mower according to claim 1, wherein a shooter (13) is arranged on one side of the side.

  According to a third aspect of the present invention, a power transmission belt (45a, 45b) is provided between the counter transmission case (29) and the input transmission case (42) of the mower (7), and the belt (45a, 45b). The riding lawn mower according to claim 1, further comprising a tension pulley (53) for securing the tension and a two-stage idle pulley (54a, 54b).

  In the invention according to claim 4, the mower (7) is provided with a pair of left and right cutting blades (47, 47) in the traveling direction, and the pair of cutting blades (47, 47) respectively correspond to the respective input transmission cases (57, 47). 42) The power is transmitted from the counter transmission case (29) and one mower input transmission case (42) and the other input transmission case (57) are connected by a transmission shaft (46). It is a riding lawn mower as described.

  According to the first aspect of the present invention, the engine power transmission system (24, 25, 27) is arranged on one side of the vehicle body (2) toward the counter transmission case (29). It is not necessary to dispose the engine power transmission system (24, 25, 27) on the front side, and it is not bulky. In addition, it is possible to branch output to both the traveling transmission system (31, 35, 36) and the mower transmission system (41, 42, 44, 45, 53, 54a, 54b) via the counter transmission case (29). It can be simplified.

  According to the second aspect of the present invention, the counter transmission case (29) and the traveling system speed change mechanism (33) can be arranged close to each other, so that both can be configured compactly, and the turf grass such as a shooter (13) is provided on the opposite side. A discharge space can be secured.

  According to invention of Claim 3, belt tension is securable irrespective of the raising / lowering position of a mower (7).

  According to the invention described in claim 4, the transmission configuration of the pair of left and right cutting blades (47, 47) is a simple configuration.

Hereinafter, a riding lawn mower equipped with the present invention will be described with reference to the drawings.
First, the overall configuration of the riding lawn mower will be described. FIG. 1 is an overall left side view, and FIG. 2 is an overall plan view with the collector removed.
In the present specification, the left and right directions in the forward direction of the riding lawn mower 1 are respectively referred to as left and right, the forward direction is referred to as front, and the reverse direction is referred to as rear.
3 is a side view of the power transmission system of the mower part of the riding lawn mower of FIG. 1, FIG. 4 is a rear view of the riding lawn mower of FIG. 1, and FIG. 5 is a power input to the mower of the riding lawn mower of FIG. A plan view of the system is shown.

  The riding lawn mower 1 includes an engine 6 inside a hood 5 at the front part of the vehicle body, left and right front wheels 3 and 3 at the front part of the vehicle body (chassis) 2, and left and right rear wheels 4 and 4 at the rear part of the vehicle body 2. It has a configuration. An engine 6 is mounted on the vehicle body 2 above the front wheels 3 and 3, and a mower 7 is disposed below the vehicle body 2. A cockpit 9 is provided above the rear portion of the vehicle body 2, and a collector 10 is attached to the rear end portion of the vehicle body 2, and a shooter 13 that connects the collector 10 and the mower deck 11 that covers the mower 7. Is arranged.

  A fuel tank 14 is disposed below the fenders 15 on both sides of the cockpit 9. The steering handle 16 is attached to a handle post 18 behind the bonnet 5.

  As shown in FIGS. 1 and 2, a transmission shaft 27 that is rotationally interlocked from the crankshaft 20 of the engine 6 via a pulley 23, a transmission belt 24, and a pulley 25 is provided on a vehicle body (chassis) 2 that is disposed in the front-rear direction. It is arranged along one side and connected to the input shaft 29a of the subsequent counter transmission case 29.

The power input into the counter transmission case 29 is transmitted from the counter transmission case 29 to a drive system for the mower 7 and a traveling system for driving the front and rear wheels 3 and 4 such as a transmission described later.

  That is, an input shaft (pump) of a pulley 31 provided on a longitudinal axis 30 provided protruding from the counter transmission case 29 and a hydrostatic continuously variable transmission (HST) 33 of a traveling system provided behind the counter transmission case 29. A belt 36 is stretched between pulleys 35 provided on a shaft 34 to drive the HST 33 and input from the HST 33 to a gear-type transmission (not shown) in a transmission case 38 from the transmission to the front wheel 3. And / or power is output to the rear wheel 4. The HST 33 and the external gear type transmission device constitute a traveling transmission.

  Further, a belt 45 is stretched between a pulley 41 provided on the horizontal shaft 40 protruding from the counter transmission case 29 and a pulley 44 provided on the input shaft 43 of the input transmission case 42 to the front mower 7 of the counter transmission case 29. The mowing blade 47 of the mower 7 is driven.

Since the transmission shaft 27 is disposed on one side of the vehicle body 2 toward the counter transmission case 29 for driving the mower 7 and the traveling wheels 3 and 4, it is not necessary to dispose the transmission shaft 27 in the upper space of the mower 7. The mower mounting part is not bulky in the height direction. Further, it is possible to branch output to both the traveling system and the mower drive system via the counter transmission case 29, and the power transmission configuration from the engine 6 can be simplified.
Further, since the counter transmission case 29 and the HST 33 can be arranged close to one side of the vehicle body 2, both can be configured compactly, and a turf grass discharge space can be secured on the opposite side of the vehicle body 2.

  The exhaust duct 50 provided at the center of the left and right decks 11 and 11 of the mower 7 is connected to the shooter 13, but the exhaust duct 50 is inclined rearward to the left with respect to the center axis in the longitudinal direction of the vehicle. A space in which a transmission such as HST33 can be placed is secured on the right side behind the vehicle.

  Further, since the discharge duct 50 is inclined toward the left rear as described above, the deck 11 of the mower 7 can be arranged in parallel in the left-right direction of the vehicle, so that the discharge duct 50 is arranged along the axial center in the front-rear direction. Compared to the case, the wheel base can be shortened and the vehicle can be downsized.

  Further, since the deck 11 of the mower 7 can be arranged in parallel in the left-right direction perpendicular to the longitudinal axis of the vehicle, a large amount of overlap between the pair of cutting blades 47 can be set at the center where the two mower decks 11 are connected. The cutting radius of turfgrass etc. can be reduced.

  A belt 45 is provided between the counter transmission case 29 and the input transmission case 42 of the mower 7 as shown in the right side view of the mower drive system portion in FIG. 3 and the plan sectional view of the power input system to the mower 7 in FIG. In addition to the transmission structure, a tension pulley 53 and two-stage idle pulleys 54a and 54b are provided.

  That is, the mower 7 is driven from the horizontal shaft 40 of the counter transmission case 29 via the transmission belt 45 a and the intermediate shaft 55, and the pulley 41 is provided on the horizontal shaft 40. Further, a first counter pulley 56 a and a second counter pulley 56 b are connected to an intermediate shaft 55 provided on the vehicle body 2. A transmission belt 45a is stretched between the pulley 41, the first counter pulley 56a, and the second counter pulley 56b, and a transmission belt 45b is stretched between the second counter pulley 56b and the input pulley 44 on the mower 7 side. ing.

  The transmission belt 45a is configured to be tensioned / relaxed by the tension pulley 53, and can be turned on and off. The transmission to the mower 7 is turned on and off by operating a PTO clutch lever (not shown).

  The transmission belt 45b is moderately tensioned by two-stage idle pulleys 54a and 54b of a bracket 54 whose lower side is connected to the machine body so as to be swingable. That is, the spring 58 is wound around the pivot portion of the bracket 54, the two-stage idle pulleys 54a and 54b are urged by the spring 58, and the two-stage idle pulley 54a and the mower 7 are in the lowered state (solid line position in FIG. 3). The idle pulley 54a on one side of 54b is in contact with the belt 45b and is tensioned. However, when the mower 7 is in the raised state (the two-dot chain line position in FIG. 3), both the two-stage idle pulleys 54a and 54b are in contact with the belt 45b and are in tension. To do.

  Note that the tension of the belt 45b by the two-stage idle pulleys 54a and 54b is not so much as to control the transmission / reception of the drive power, but a tension that prevents the transmission belt 45b from falling off the two-stage idle pulleys 54a and 54b. Is intended.

The driving force input via the input pulley 44 fixed to the input shaft 43 of the mower input transmission case 42 is transmitted to the right cutting blade 47 via a bevel gear mechanism provided on a drive shaft (not shown) in the mower input transmission case 42. The drive shaft is transmitted to the drive shaft of the left cutting blade 47 in the input transmission case 57 in which the drive shaft of the left cutting blade 47 is accommodated via the transmission shaft 46.
Note that the transmission mechanism is configured so that the left and right cutting blades 47 and 47 rotate simultaneously while maintaining a phase difference of 90 degrees.

  The engine power is transmitted to the cutting blades 47 and 47 of the mower 7 using the two-stage idle pulleys 54a and 54b and the belt 45 with the above configuration, so that the tension of the belt 45b can be ensured regardless of the lift position of the mower 7. it can.

  As shown in the plan view of FIG. 2 and the like, the gauge wheels 7b, 7b on the left and right rear sides of the mower 7 and the tip of the turf grass discharge duct 50 are provided on substantially the same plane. For this reason, as shown in FIG. 6, when maintenance such as replacement of the cutting blade 47 of the mower 7 is performed, the left and right rear gauge wheels 7b, 7b of the mower 7 and the tip of the turf grass discharge duct 50 are stably grounded. The more deck 11 can be leaned up.

Next, the configuration of the mower 7 will be described.
The mower deck 11 of the mower 7 is a left-right symmetrical housing having a substantially 8-shaped plan view covering the two left and right cutting blades 47, 47, and the cutting blades 47, 47 rotate in opposite directions. Yes. Further, the left and right mower decks 11 and 11 are formed with discharge passages 11a and 11a along the rotation direction of the cutting blades 47 and 47, and the end portions of the discharge passages 11a and 11a merge at the left and right central portions, and obliquely backward. A discharge duct 50 inclined to the rear is formed, and the rear end of the duct 50 is connected to the front end of the shooter 13 so that turfgrass is fed into the shooter 13.

  As shown in FIG. 1, a first support link 59 a that connects the front end portion of the mower deck 11 and a second support link 59 b that connects the rear portion of the mower deck 11 are provided at the lower abdomen of the traveling vehicle body 2. The mower deck 11 is supported by the link mechanism 59 so as to be movable up and down. The mower deck 11 is provided with a pair of left and right gauge wheels 7a and 7b at the front and rear, and the rear gauge wheel 7b is configured to be adjustable in height.

  As described above, when the rotational power of the engine 6 is transmitted to the rotating parts, the left and right cutting blades 47 and 47 are rotated in opposite directions, and the turfgrass cut by the cutting blades 47 and 47 at a predetermined cutting height is It is discharged to the rear shooter 13 through the left and right discharge passages 11 a, 11 a in the mower deck 11, and is accommodated in the collector 10 through the shooter 13. When the collector 10 is full of turfgrass, the hydraulic control lever is operated to extend a lifting cylinder (not shown) to raise and rotate the collector 10 to release the turfgrass.

Next, based on the side view of the shooter part of FIG. 7, the bottom part on the collector 10 side in the shooter 13 is a two-stage open / close plate, and the configuration of these open / close mechanisms will be described.
A part of the bottom plate on the collector 10 side in the shooter 13 is composed of a first bottom plate 62 connected to the end of the shooter 13 and a second bottom plate 63 continuous to the first bottom plate 62, and a pivot fulcrum 62 a of the first bottom plate 62 is The pivot point 63 a of the second bottom plate 63 is provided at the connection portion with the collector 10. A distal end portion of a rotation arm 72 integral with the second bottom plate 63 is rotatably connected to the rotation fulcrum 63a of the second bottom plate 63. A plate member 65 having a long hole 65 a and a long hole 65 b is attached to the base of an opening / closing lever 64 disposed below the left side of the cockpit 9.

  Between the first bottom plate side portion 62b in the vicinity of the rotation fulcrum 62a of the first bottom plate 62 and the long hole 65a of the plate member 65, links 66 having both ends rotatably connected are arranged. In addition, a link 68 having both ends rotatably connected to each other is disposed between the end of the rotating arm 72 integral with the second bottom plate 63 and the elongated hole 65b of the plate member 65. An adjustment rod 70 incorporating a spring 69 biased in the longitudinal direction of the link 66 is screwed into the link 66 on the long hole 65 a side of the plate material 65, and the tip of the adjustment rod 70 is the length of the plate material 65. The hole 65a is slidably locked. An adjustment rod 71 is screwed into the link 68 on the long hole 65 b side of the plate member 65, and the tip of the adjustment rod 71 is slidably locked in the long hole 65 b of the plate member 65.

  In the above configuration, first, when the opening / closing lever 64 is pulled in the direction of the arrow a, first, the combination of the adjustment rod 70 and the link 66 locked to the elongated hole 65a of the plate member 65 attached to the base of the opening / closing lever 64 is first performed. The first bottom plate 62 is rotated in the direction of arrow b around the rotation fulcrum 62a. The turf grass deposited on the first bottom plate 62 by the rotation of the first bottom plate 62 is moved to the second bottom plate 63 side.

  Further, when the opening / closing lever 64 is pulled in the direction of the arrow a and the tip of the adjustment rod 71 screwed into the long hole 65b of the plate member 65 passes the non-operation range by the long hole 65b, the adjustment rod 71, the link 68, and the rotating arm 72. The link mechanism comprising the combination of the second base plate 63 rotates the second bottom plate 63 about the rotation fulcrum 63a in the direction of the arrow c, and the turf grass accumulated on the second bottom plate 63 jumps into the collector 10.

  While the second bottom plate 63 is rotating, the first bottom plate 62 is stopped while maintaining a predetermined standing posture by the compression of the spring 69 interposed between the adjustment rod 70 and the link 66, and the subsequent The movement of turf grass to the second bottom plate 63 side is limited. Thus, the grass on the first bottom plate 62 and the second bottom plate 63 is conveyed to the collector 10 side.

  Next, when the screwing position of the adjustment rod 71 screwed to the link 68 is adjusted to set the total length of the link 68 and the adjustment rod 71 to be short, the adjustment rod 71 engages with the long hole 65 b of the plate member 65. The position is lowered in advance.

  When the opening / closing lever 64 is pulled in this state, the first bottom plate 62 and the second bottom plate 63 are moved substantially simultaneously (or depending on the setting of the screwing position of the adjusting rod 71 and the screwing position of the adjusting rod 70) First, the turf grass on the first bottom plate 62 is discharged downward from the open space where the second bottom plate 63 is opened in order to rotate in the direction of the arrow b and the arrow c to open the second bottom plate 63. The

If comprised in this way, since the turf grass is discharged out of the machine without being accommodated in the collector 10, the clogging phenomenon can be eliminated at an early stage.
Also, the turfgrass deposited on the first bottom plate 62 can fall on the ground from the space formed when the second bottom plate 63 is opened.
In this way, turfgrass can be easily and reliably removed from the shooter where turfgrass is likely to be clogged.

  The collector 10 is supported by a left and right shaft 73 at the rear part of the machine body, and switches from a state in which turf grass from the shooter 13 can be received to a state in which the collector 10 rotates around the shaft 73 and discharges the turf grass from the front release portion. It is a configuration. An operation lever 106 is provided at the front end of the collector 10, and the entire collector 10 can be rotated around an axis 73 by pulling the operation lever 106 upward and tilting it forward. The damper 105 is a member that assists the rotation of the collector 10.

  The present invention has high industrial applicability as a small riding lawn mower.

It is a left view of the riding lawn mower of one Example of the present invention. It is a top view below from the vehicle body (no collector) of the riding lawn mower of one embodiment of the present invention. It is a right view of the power transmission system of the mower part of the riding lawn mower of one embodiment of the present invention. It is a rear view of the riding lawn mower of one Example of the present invention. It is a top view which shows the power input system to the mower of the riding lawn mower of one Example of this invention. It is a side view of the state which raised the mower deck of the riding lawn mower of FIG. 1 on the ground. It is a side view for description of the baseplate interlocking mechanism of the connection part of the shooter and collector of the riding lawn mower of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Riding lawn mower 2 Car body 3 Front wheel 4 Rear wheel 5 Bonnet 6 Engine 7 Moore 7a, 7b Gauge wheel 9 Pilot seat 10 Collector 11 More deck 11a Discharge passage 13 Shutter 14 Fuel tank 15 Fender 16 Steering handle 18 Handle post 20 Crankshaft 23 Engine Crank pulley 24 Transmission belt 25 Pulley 27 Transmission shaft 29 Counter transmission case 29a Input shaft
30 Vertical axis 31 Pulley 33 Hydrostatic continuously variable transmission (HST)
34 Input shaft (pump shaft) 35 Pulley 36 Belt 38 Transmission case 40 Horizontal shaft 41 Pulley 42 Input transmission case 43 Input shaft 44 Input pulley 45, 45a, 45b Transmission belt 46 Transmission shaft 47 Cutting blade 50 Discharge duct 53 Tension pulley 54a, 54b Two-stage idle pulley 55 Intermediate shaft 56a First counter pulley 56b Second counter pulley 57 Input transmission case 58 Constant spring 59 Parallel link mechanism 59a First support link 59b Second support link 62 First bottom plate 62a Rotation fulcrum 62b First Bottom plate side portion 63 Second bottom plate 63a Rotation fulcrum 63b Second bottom plate side portion 64 Opening / closing lever 65 Plate members 65a, 65b Long hole 66 Link 68 Link 69 Spring 70 Adjustment rod 71 Adjustment rod 72 Rotation arm 73 Shaft 105 Damper 106 Operation lever

Claims (4)

An engine (6) provided at a front portion on the traveling vehicle body (2);
A travel transmission (33) provided at a rear portion on the travel vehicle body (2);
A mower (7) provided on the abdomen of the traveling vehicle body (2) having a pair of left and right front and rear wheels (3, 4);
A collector (10) for collecting grass mounted on the rear of the traveling vehicle body (2);
A riding lawn mower comprising a shooter (13) connecting the mower (7) and the collector (10),
An engine power transmission system (24, 25, 27) provided along the front-rear direction of the left and right sides of the vehicle body (2) for transmitting power from the engine (6);
A counter transmission case (29) provided at the rear of the vehicle body for inputting power from the engine power transmission system (24, 25, 27) and outputting it to the vertical axis (30) and the horizontal axis (40);
A traveling transmission system (31, 35, 36) for transmitting the output from the vertical axis (30) of the counter transmission case (29) to the traveling transmission (33);
And a mower transmission system (41, 42, 44, 45, 53, 54a, 54b) for transmitting the output from the horizontal axis (40) of the counter transmission case (29) to the mower (7). Riding lawn mower.   The counter transmission case (29) and the traveling transmission (33) are arranged on one side of the left and right sides of the vehicle body (2), and the shooter (13 The riding lawn mower according to claim 1, wherein:   Belts (45a, 45b) for power transmission are provided between the counter transmission case (29) and the input transmission case (42) of the mower (7), and tension pulleys for securing the tension of the belts (45a, 45b) ( 53) and a two-stage idle pulley (54a, 54b).   The mower (7) is provided with a pair of left and right cutting blades (47, 47) in the traveling direction, and power is transmitted to the pair of cutting blades (47, 47) from the corresponding input transmission cases (57, 42), 4. The passenger according to claim 3, wherein one of the mower input transmission case (42) and the other input transmission case (57) to which power is transmitted from the counter transmission case (29) is connected by a transmission shaft (46). Lawn mower.

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