JP2002238325A - Sulky lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a large stress given to a deck itself and enhance durability of a mower by devising a structure for connecting and supporting the mower in a sulky lawn mower in which the mower is connected in a suspended state to a sulky traveling machine body through a lifting link mechanism. SOLUTION: In this sulky lawn mower, a lifting link mechanism 5 is constituted in a 4 linking structure comprising a front link 21 and a rear link 22 pivotally linked to a machine frame 8 and a forward and backward directing link 23 pivotally connected to from the free ends of the frond link 21 ranging to the rear link 21 and the front and back parts of the mower are flexibly suspended in upward and downward directions from and linked to the lifting mechanism 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding lawn mower having a mower suspended and connected to a riding traveling body via a lifting link mechanism so as to be able to lift and lower.

[0002]

2. Description of the Related Art As the riding type mower described above, for example,
JP-A-2000-53032 and JP-A-2000-35
As disclosed in Japanese Patent Publication No. 1330, the lifting link mechanism includes a front link and a rear link. The front and rear of the mower are connected to the free ends of the front and rear links, and the body, the front and rear links, and the deck of the mower. A parallel quadruple link structure was configured. Further, the posture of the mower is adjusted by operating a screw expansion / contraction adjusting section provided on the front link.

[0003]

In the parallel quadruple link structure having the above structure, since the mower deck itself functions as a part of the link, a large stress due to the weight of the mower and the traction load during work traveling. Worked on the deck, leaving room for improvement in terms of durability. Of course, it is also possible to increase the strength of the deck by taking measures such as configuring the deck to be thick and providing a large number of reinforcing ribs, but increasing the weight of the entire mower and increasing the manufacturing cost, etc. Problem occurred.

The present invention has been made in view of such a situation. By devising a connection support structure of the mower, it is possible to suppress a large stress from acting on the deck itself. The main purpose is to increase the durability.

[0005]

Means for Solving the Problems [Configuration, Function and Effect of the Invention According to Claim 1]

(Structure) The invention according to claim 1 is a riding lawn mower in which a mower is suspended and connected to a riding traveling body via a lifting link mechanism so that the mower can be lifted and lowered. A four-link structure comprising a front link and a rear link connected to each other, and a front-rear link connected pivotally across the free ends of the front link and the rear link. The front and rear are suspended and connected with flexibility in the vertical direction.

(Operation) According to the above configuration, the front link,
Since the elevating link mechanism including the rear link and the front-rear link has a quadruple link structure by itself, it is sufficient that the elevating link mechanism is given a strength to withstand the load of the mower and the traction load. No load stress for maintaining the link structure is applied to the mower simply suspended and supported by the link mechanism. Therefore, there is no need to increase the strength of the deck as in the conventional structure in which the Mower deck is part of the quadruple link structure.

Further, the mower can retreat upward due to the flexibility of the front and rear connecting portions, and even if the mower comes into contact with the ground, it can be easily retracted upward to avoid damage.

(Effects) Therefore, according to the first aspect of the present invention, it is sufficient that the deck has sufficient strength to maintain the function of the mower, and while reducing the weight and cost of the entire mower, The durability as a lawn mower can be secured.

[Structure, operation and effect of the invention according to claim 2]

(Structure) According to a second aspect of the present invention, in the first aspect of the present invention, the suspension height at a connecting portion before and after the mower is adjustable.

(Operation) According to the above configuration, the posture of the mower in the front-rear direction can be adjusted by changing and adjusting the lower limit height of the accommodation at the front and rear connection points. It can be set, or it can be set to a posture in which it is slightly lowered and inclined forward with respect to the forward direction. Moreover, even if such an adjustment is made, there is no change in the specification of the lifting link mechanism, and the desired mower support function and strength are exhibited.

(Effect) Therefore, according to the second aspect of the present invention, the above-mentioned effect of the first aspect is provided, and the mower's posture is arbitrarily adjusted, and the degree of finishing is optionally adjusted, so that desired mowing is achieved. It can be performed.

[Structure, operation and effect of the invention according to claim 3]

(Structure) According to a third aspect of the present invention, in the invention according to the first aspect, two sets of right and left elevating link mechanisms having a four-link structure are provided. While connecting to the lifting link mechanism,
It is characterized in that the suspension height at each of the front, rear, left and right connection points can be adjusted.

(Operation) According to the above configuration, by changing and adjusting the lower limit height of the accommodation at the front, rear, left and right connection points, the front and rear posture and the left and right posture of the mower can be freely adjusted. Moreover, even if such an adjustment is made, there is no change in the specification of the lifting link mechanism, and the desired mower support function and strength are exhibited.

(Effects) Therefore, according to the third aspect of the present invention, the above-described effects of the first aspect are provided, and the mower's posture is arbitrarily adjusted, and the finishing condition and the like are arbitrarily adjusted so that the desired lawn mowing is achieved It can be performed.

[Structure, operation and effect of the invention according to claim 4]

(Structure) According to a fourth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a connecting pin for pivotally connecting the free ends of the front link, the rear link, and the front-rear link. In addition, the front and rear of the mower are clean.

(Operation / Effect) According to the above configuration, the connecting pin for pivotally connecting the free ends of the front link and the rear link to the front-rear link can be shared with the support pin for suspending and supporting the mower. This is effective for cost reduction by saving.

[Structure, operation and effect of the invention according to claim 5]

(Structure) According to a fifth aspect of the present invention, in the invention of any one of the first to fourth aspects, a pedal for raising and lowering the lifting link mechanism is provided in a driving unit of the passenger traveling body. Features.

(Operation / Effect) According to the above-mentioned configuration, the operator in boarding operation can raise and lower the mower by foot operation while operating the body with both hands, which is effective in improving operability and workability. .

[Structure, operation and effect of the invention according to claim 6]

(Structure) The invention according to claim 6 is characterized in that, in the invention according to claim 5, the pedal is used to switch a control valve of a hydraulic cylinder for operating the lifting link mechanism up and down. I do.

(Operation / Effect) According to the above configuration, the pedal operation for switching the control valve is light, and the operability and workability are further improved.

[Structure, operation and effect of the invention according to claim 7]

(Structure) According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, the riding traveling body includes left and right driving rear wheels and caster type idle front wheels, and The mower is disposed between a wheel and a free-wheeling front wheel, and the left and right driving rear wheels are configured to be independently capable of normal and reverse rotation.

(Operation) According to the above configuration, the left and right driving rear wheels are operated in the same direction and at the same speed to perform straight running, and the left and right driving speeds can be varied to steer the aircraft. In particular, by operating the left and right driving rear wheels in opposite directions, it is possible to perform a single-point turning of the body around the turning rear wheels, that is, a so-called spin turn.

(Effects) Therefore, according to the invention of claim 7, the above-mentioned effects of any one of the inventions of claims 1 to 6 can be obtained, and various running or turning of the body can be performed, so that golf can be performed. The mowing work can be performed lightly on a lawn having a complicated shape such as a place or a lawn with many standing trees.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall side view of a riding lawn mower according to the present invention, and FIG. 2 shows a plan view thereof. This riding lawn mower has a riding traveling body 1
A pair of left and right idle front wheels 2 which can be turned in a caster manner and a pair of left and right driving rear wheels 3 fixed to the rear of the fuselage are provided at the front of the vehicle. In the lower abdomen between the aircraft, bar blade type mower 4
Has a structure in which it is suspended and connected via an elevating link mechanism 5, an engine 6 for driving the driving rear wheel 3 and the mower 4 is mounted on the rear part of the fuselage, and a driver seat 7 is provided in front of the engine.

As shown in the figure, after the power from the engine 6 is transmitted to the counter case 11, two sets of forward and reverse hydrostatic continuously variable transmissions (hereinafter referred to as "HST" and "HST") arranged on the left and right sides of the counter case 11 are provided. The transmission output from each HST 12 is transmitted to the left and right driving rear wheels 3 via the deceleration case 13. A shift lever 14 for shifting each HST 12 is provided on both left and right sides of the driver's seat so as to be able to swing back and forth. By swinging both shift levers 14 forward by the same amount, the vehicle can travel straight ahead. In addition, by performing the swinging operation by the same amount in the rearward direction, it is possible to perform straight forward and reverse traveling. Further, by making a difference in the operation amount of the left and right shift levers 14 in the same direction, a speed difference corresponding to the difference is obtained. To perform forward steering or reverse steering. In particular, by operating the left and right shift levers 14 in opposite directions, the left and right driving rear wheels 3 are operated in opposite directions to each other, and a single-point turning around the driving rear wheels 3 as a turning center, a so-called spin turn Can turn the aircraft.

The lifting link mechanism 5 includes
A front link 21 and a rear link 22 pivotally connected to the front and rear two places of the left and right main frames 8 and a front-rear link 23 pivotally connected across these free ends. It is constituted by a parallel quadruple link mechanism. A fulcrum shaft 2 connecting the base ends of the left and right rear links 22
A single-acting hydraulic cylinder 26 is connected to a drive arm 25 protruding from the hydraulic cylinder 4, and the hydraulic cylinder 26 is driven and extended by the supply of pressure oil, whereby the entire lifting link mechanism 5 is driven to rise in parallel, and the hydraulic pressure is reduced by drainage. When the cylinder 26 is shortened, the entire lifting link mechanism 5 descends in parallel with its own weight. An elevating lever 28 that operates a control valve 27 that controls the operation of the hydraulic cylinder 26 is provided on the right lateral outside of the driver's seat 7.

A lower limit adjusting mechanism 30 for adjusting the lowering limit of the lifting link mechanism 5 by adjusting the swing limit of the drive arm 25 is provided. This lower limit adjusting mechanism 30
As shown in FIG. 6, by rotating an adjustment knob 31 provided below the driver's seat 7 to rotate a stopper 32 having a stepped rotation shape, the drag pin 3 provided on the drive arm 25 is rotated.
The height of the stopper surface acting on the third arm 3 is selected, whereby the downward swing limit of the drive arm 25 is adjusted.

At four positions on the upper surface of the deck 41 of the mower 4 at the front, rear, left and right, a bracket 4 having upper and lower slots 42 is provided.
The connecting pins 35 and 36 for pivotally connecting the front and rear links 21 and 22 and the front and rear link 23 are inserted through and connected to the long holes 42 of the brackets 43, so that the mower 4 is within a predetermined range. It is suspended and supported with the upper and lower flexibility. As shown in FIGS. 7 and 8, an adjustment bolt 44 for restricting the upper end position of the long hole 42 is mounted on the upper part of each bracket 43. The suspension height at each of the front, rear, left, and right support points of the mower 4 can be finely adjusted to adjust the posture of the mower 4 in the front-rear direction and the left-right direction.

As shown in FIG. 5, the mower 4 has three rotating bar blades 4 inside a deck 41 made of a sheet metal press.
5 is used, and a rearward-facing input shaft 47 of a bevel gear case 46 provided at the center of the upper surface of the deck and a PTO shaft 48 protruding forward from the counter case 11 are transmission shafts. The power input to the bevel gear case 46 is transmitted to the central blade 45 via the shaft 51, and the power input to the bevel gear case 46 is transmitted via the belt 51 to the left and right blades 44. It has become. The PTO
A PTO clutch lever 52 for operating a PTO clutch (not shown) for interrupting power take-off from the shaft 48 is provided on the right side of the driver's seat 7.

The idle front wheel 2 is mounted on both ends of a front wheel support frame 55 which is connected to the front end of the main frame 8 so as to be able to swing around a longitudinal axis x. By rotating the front wheel support frame 55 up and down about the longitudinal axis x, the front part of the machine body can be lifted. As described above, by using the front wheel support frame 55 to greatly lift the front of the aircraft, the bottom of the deck is opened while the mower 4 is mounted on the aircraft to facilitate blade replacement and cleaning inside the deck. You can do it.

Reference numeral 57 in the figure is a hand accelerator lever for adjusting the speed of the engine 6, and 58 is a hand brake lever used for parking.

[Alternative Embodiment] As shown in FIG. 9, when a pedal 60 for switching the control valve 27 for raising and lowering is provided at the front foot of the driver's seat 7 instead of the raising and lowering lever 28, both hands are operated. The mower 4 can be raised and lowered by foot operation while being used, and this is effective in improving operability. In this case, the pedal 60 may be stepped back and forth with the toe and the heel, and the lifting operation may be performed with a single pedal. Alternatively, the lifting pedal and the lowering pedal may be separated, and they may be depressed. A lifting operation may be performed.

The pedal 60 and the lifting link mechanism 5
May be mechanically linked to each other so that the lifting / lowering link mechanism 5 is vertically moved by depressing the pedal 60.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding lawn mower.

FIG. 2 is an overall plan view of a riding lawn mower.

FIG. 3 is a rear view of the riding type mower.

FIG. 4 is a side view of the mower suspension structure.

FIG. 5 is a plan view showing a mower drive structure.

FIG. 6 is a front view showing a mower lifting drive unit;

FIG. 7 is a cutaway side view showing a part of the mower suspension structure.

FIG. 8 is a longitudinal sectional front view showing a part of the mower suspension structure.

FIG. 9 is an overall side view showing a riding lawn mower according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Riding body 2 Riding front wheel 3 Driving rear wheel 4 Mower 5 Elevating link mechanism 21 Front link 22 Rear link 23 Front-back link 26 Hydraulic cylinder 27 Control valve 35 Connection pin 36 Connection pin 60 Pedal

 ──────────────────────────────────────────────────の Continued on the front page (72) Yoshikazu Togoshi 64, Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works, Inc. In-house (72) Inventor Yoshihiro Kawahara 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works, Ltd. 2B083 AA02 BA12 BA18 CA13 HA03 HA06 HA28 HA38

Claims (7)

[Claims] 1. A riding lawn mower having a mower suspended and connected to a riding body via a lifting link mechanism so that the mower can be lifted and lowered. And a front-rear link that is pivotally connected across the free ends of the front link and the rear link, and the lifting link mechanism suspends the front and rear of the mower with vertical flexibility. Riding lawn mower characterized by being lowered and connected. 2. The riding lawn mower according to claim 1, wherein a suspension height at a connection point before and after the mower is adjustable. 3. The riding lawn mower according to claim 1, further comprising two sets of right and left link mechanisms having a quadruple link structure, and two left and right link sections at front and rear of the mower. And a suspension mower at each of the front, rear, left and right connection points is adjustable. 4. The riding lawnmower according to claim 1, wherein the connecting pin pivotally connects the free ends of the front link, the rear link, and the front-rear link. And a mower connected to the front and rear of the mower. 5. The riding lawn mower according to claim 1, wherein a pedal for operating the lifting link mechanism to move up and down is provided in a driving section of the riding traveling body. Riding lawn mower. 6. A riding lawn mower according to claim 5, wherein the pedal is used to switch a control valve of a hydraulic cylinder for operating the lifting link mechanism up and down. Type mower. 7. The riding lawn mower according to claim 1, wherein the riding traveling body is provided with left and right driving rear wheels and caster type idle front wheels, and a driving rear wheel. A mower disposed between the front and rear idler wheels, and the left and right driving rear wheels are configured to be independently capable of forward and reverse speed change.