JPH1189377A - Mower elevating device for riding lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an almighty lawn mower which is easy to perform mowing work in a normal area or a narrow place while being equipped with a five-row reel mower suitable for large-scale grassland. SOLUTION: Three first to third reel mowers 3,3,3 on the front side of the fuselage and fourth and fifth reel mowers 5,5 on the left and right of the fuselage.
And the first to fifth reel mowers 3, 3, 3,
A switching valve 30 is provided which is provided with lift cylinders 2B and 4B which can swing up and down independently with respect to the machine body, and which blocks an oil passage for the lift cylinder 4B to thereby prevent the reel mower 5 from descending. The fourth and fifth reel mowers 5 and 5 on the side of the machine are provided with hydraulic circuits for lifting and lowering, respectively.

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 reel mower at the front of the fuselage.
The present invention relates to a mower elevating device of a riding lawn mower having a total of five reel mowers.

[0002]

2. Description of the Related Art As a riding lawn mower equipped with a reel mower, a triple mower having three reel mowers connected to the front of the machine so as to be able to move up and down as shown in Japanese Patent Application Laid-Open No. 9-121645. Formula ones were common.

[0003]

In order to construct a lawn mower for a large area grassland such as a golf course using a reel mower, a reel mower is provided on each of the left and right sides of the fuselage in the above-mentioned triple type. The use of a five-unit type is preferable in that the front-rear balance can be improved as compared with the three-unit type while having a large cutting width.

However, in the case of a five-row system, the overall width of the machine becomes large, and when mowing work is always performed with five reel mowers, it is difficult to provide flexibility in a narrow place. It may be preferable to configure a lifting device. The purpose of the present invention is
While equipped with a five-reel reel mower suitable for large-scale grassland,
An object of the present invention is to provide an almighty lawn mower that can easily perform mowing work in a normal area or a narrow place.

[0005]

According to a first aspect of the present invention, there is provided a mower elevating device for a riding lawn mower.
A first reel mower disposed in a central region in the left-right direction of the front of the traveling machine body, and a first reel mower disposed on each of the left and right of the first reel mower.
The second and third reel mowers are arranged such that a part of the cutting width overlaps with the reel mower, and the second and third reel mowers are arranged such that a part of the cutting width overlaps with the second reel mower at the left lateral position of the traveling machine. A fourth reel mower, and a fifth reel mower disposed so that a part of the cutting width overlaps with the third reel mower at a position on the right side of the traveling machine. A hydraulic actuator for allowing the lift to move up and down, and a valve for preventing the lowered reel mower from lowering by closing an oil passage for the hydraulic actuator for raising and lowering the reel mower,
The fourth and fifth reel mower lifting / lowering hydraulic circuits are provided respectively.

According to a second aspect of the present invention, in the first aspect, the hydraulic circuit is configured such that all of the first to fifth reel mowers are simultaneously raised and lowered, and the fourth and fifth reel mowers are raised and lowered. Each is provided with a switching valve that can be switched between an open position that allows the lowering of the mower and a lowered lock position that prevents the lowering of the mower.

[Operation] According to the configuration of the first aspect, the first to the first.
Even if the three reel mowers are lowered, the fourth and fifth reel mowers provided on the left and right sides of the machine can be stopped in an up state. Therefore, in addition to mowing work in a five-reel mower state using five reel mowers, the fourth Alternatively, it is possible to freely select a mowing operation in a quadruple reel mower state with the fifth reel mower raised and a mowing operation in any of the continuous reel mower states with the fourth and fifth reel mowers raised. become. In other words, by appropriately using the three to five reel mower state, a state suitable for not only a large-area grassland but also a grass-cutting work or a narrow-cutting work of a narrow width left uncut can be realized. Further, since the hydraulic actuator is used for raising and lowering each reel mower, the above-described operation can be achieved by a simple modification such as providing a valve for closing an oil passage of the hydraulic circuit.

Further, if the fourth and fifth reel mowers are swung up and down, the machine body will rise with an inclination angle such that the outside of the machine body is high and the inside of the machine body is low. It is in a state suitable for traveling on the bank. In other words, by raising one or both of the fourth and fifth reel mowers, it is possible to pass through a narrow place such as a grove, and also perform mowing work right beside a slope such as a bank or a bank. , Etc., so that more mowing work forms can be selected. Also, when raised, the lower surfaces of the fourth and fifth reel mowers are exposed to facilitate maintenance.

According to the second aspect of the present invention, one or both of the fourth and fifth reel mowers are raised, and the first and second reel mowers are raised.
The third reel mower can easily appear in the lowered state by the switching operation of the switching valve, and the above-described operation can be obtained.
Then, at the time of the mower raising operation, all the reel mowers are raised, so that the mowing operation can be stopped or the shift to the traveling state can be quickly performed by only one kind of operation.

According to the first and second mower elevating devices, (a) the hydraulic circuit for the fourth and fifth reel mowers can be easily modified by providing a valve for preventing the lowering of the mower. While it is possible to appropriately use the reel-to-5-reel mower state, and to improve the narrow-passing performance,
It was possible to provide a wide range of mowing work from a relatively narrow grassland or a narrow grassland to a large grassland.

In the mower lifting device according to the second aspect, the fourth
With the switching valve for lowering operation provided only in the hydraulic circuit for the fifth reel mower, the above-mentioned effect (a) can be obtained, and simultaneously the raising operation of five reel mowers can be performed. There is an advantage that the state can be shifted to the traveling state.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows the overall side view of the lawn mower,
FIG. 2 is an overall plan view. The lawn mower includes a riding type traveling body 1, three reel mowers 3 connected to the front of the traveling body 1 via a front elevation link mechanism 2 so as to be able to move up and down, and left and right elevation link mechanisms 4. Left and right 1 connected to the left and right sides of the traveling body 1
It is configured as a five-reel mower type having a total of five reel mowers 5 each. Each of the lifting link mechanisms 2 and 4 and each of the reel mowers 3 and 5 are of a hydraulic drive type that is hydraulically driven by hydraulic oil supplied from the traveling machine body 1. Further, each of the reel mowers 3 and 5 is configured to be able to roll freely around the longitudinal axis P1.

As shown in FIGS. 1 and 2, the traveling body 1
Riding operation unit 6 disposed at the front, driving unit 7 disposed at the rear, a pair of left and right driving front wheels 8 mounted at the front, which cannot be steered, and steering operation mounted at the rear A four-wheel drive type is constituted by a pair of freely movable left and right driving rear wheels 9 and the like. The traveling body 1 between the boarding operation unit 6 and the driving unit 7
, Each lifting link mechanism 2,4 and each reel mower 3,5
A hydraulic oil tank (not shown) storing hydraulic oil to be supplied to the vehicle is provided.

As shown in FIGS. 1 and 2, a first reel mower 3 is provided at the center of the front of the traveling body 1 in the left-right direction.
A first reel mower 3 is provided on each of the left and right sides of the first reel mower 3.
And the second and third reel mowers 3 arranged so that a part of the cutting width overlaps with the second reel mower 3 and a part of the cutting width at the left side position of the traveling machine 1. A fourth reel mower 5 is provided, and a fifth reel mower 5 is disposed at a position on the right side of the traveling machine so as to partially overlap the third reel mower 3 with a cutting width.

The first to third parts connected to the front of the traveling body 1
The reel mowers 3, 3, and 3 are hydraulic lift cylinders 2B.
1st arm 1 by the operation of the front lifting link mechanism 2 provided with
By the swing of the 0 and the second and third arms 12, 12, each of the reel mowers 3 can be swung up and down to a non-working position where each reel mower 3 follows the ground and a non-working position where each reel mower 3 separates from the ground. In the non-working position, the second and third reel mowers 3, 3 disposed rearward can be switched to the storage posture in which the outer ends thereof stand up.

As shown in FIGS. 1, 2 and 4, the fourth and fifth reel mowers 5, 5 connected to the left and right sides of the traveling body 1 are operated by the left and right lifting link mechanisms 4, respectively.
The work posture can be switched between a work posture in which the ground follows the ground and a storage posture in which the outer ends of the work stand up and are separated from the ground. More specifically, each of the left and right lifting link mechanisms 4 includes a swing link 4A pivotally supported by each of the body frames 11 located on both right and left sides of the traveling body 1 so as to be vertically swingable around a longitudinal axis P2. It is constituted by a hydraulic lift cylinder 4B that drives the swing link 4A to swing.

At the free end of the oscillating link 4A, the left and right central portions of the housing 5A of the respective reel mowers 5 are aligned with the front-rear axis P1.
It is pivotally connected around it for rolling and swinging. A rod 13 is pivotally supported below the swing link 4A in each of the left and right body frames 11 so as to be vertically swingable around a longitudinal axis P3. A long hole 13a is formed on the free end side of the rod 13, and the long hole 13a is engaged with an engaging pin 5a provided on the traveling body 1 side with respect to the longitudinal axis P1 in the housing 5A of each reel mower 5. Has been stopped.

The pivotal position of the rod 13, the length of the rod 13 and the elongated hole 13a, and the location of the engagement pin 5a are determined by the engagement pin 5a when the reel mowers 5 are in the horizontal working posture. When the reel mower 5 is in the retracted position, the engaging pin 5a is positioned at the approximate center of the long hole 13a.
, And the longitudinal axis P3, which is the swing fulcrum of the rod 13, the engaging pin 5a, and the longitudinal axis P1, which is the rolling fulcrum of the reel mower 5, are aligned in a straight line. Is set to

With the above configuration, the lift cylinder 4B
When the swing link 4A is lifted and rocked by the operation of (1), the reel mower 5 rises in a horizontal posture, and with the rise, the rod 13 linked via the engaging pin 5a is lifted and rocked, and the reel mower 5 is moved. The engagement pin 5a moves to the free end side of the rod 13 in the long hole 13a. When the engaging pin 5a reaches the end of the elongated hole 13a on the rod 13 free end side,
As the reel mower 5 rises, the ascent of the traveling body 1 is stopped by the rod 13, and the swing fulcrum P3 of the rod 13, the engagement pin 5a, and the rolling fulcrum P1 of the reel mower 5 are directly connected. In the state of being aligned on the line, the outer end stands up and is switched to the storage posture separated from the ground.

In this retracted position, the swinging fulcrum P3 of the rod 13, the engaging pin 5a, and the rolling fulcrum P1 of the reel mower 5 are arranged in a straight line, so that the rod 13 is connected to the traveling machine 1 and the reel mower 5. , The rolling fulcrum P1 of the reel mower 5
The swing around is regulated. That is, rod 1
Numeral 3 functions as a restraint member for restricting swinging around the rolling fulcrum P1 in the retracted posture of the reel mower 5.

On the other hand, when the swing link 4A is caused to swing downward by the operation of the lift cylinder 4B,
As the reel mower 5 descends, the rod 13 descends and swings, allowing the reel mower 5 to return to a horizontal posture due to its own weight. It can be switched. In this working posture, the engagement pin 5a is
3a, it is located substantially at the center of the slot 13a.
Rolling swing of the reel mower 5 is allowed by the accommodation of the a. That is, the elongated hole 13a formed on the free end side of the rod 13 functions as a flexible portion that allows rolling swing in the working posture of the reel mower 5.

Therefore, in the working posture of each reel mower 5, the rolling motion of each reel mower 5 is allowed by the action of the above-mentioned flexible portion 13a, so that each reel mower 5 is placed on the ground along the horizontal inclination of the terrain. Since it follows the ground contact, it is possible to perform a good mowing operation by the rolling swing of each reel mower 5.

Also, as described above, the state where the accommodation limit of the accommodation part 13a is reached by the rise of the fourth and fifth reel mowers 5, 5 (the engagement pin 5a of the reel mower 5 is
3a, the swing fulcrum P3 of the rod 13, the engagement pin 5a, and the rolling fulcrum P1 of the reel mower 5 are aligned in a straight line while reaching the end of the rod 13 at the free end side. In the storage posture of each reel mower 5, the above-described tensioning action of the restraint member 13 can be obtained.

[0024] In addition, the action of the reel mower 5 enables the swing of the reel mowers 5 around the rolling fulcrum P1 to be regulated, so that the traveling machine 1 when traveling on uneven terrain or the like is used.
The deformation of the housing 5A and the damage of the fourth and fifth reel mowers 5, 5 due to the collision of the reel mowers 5 around the rolling fulcrum P1 with other objects which may occur due to the vibration of the reel mowers 5 can be prevented. is there.

Next, a hydraulic circuit for rotating the first to fifth reel mowers will be described. In this lawn mower, basically, two sets of circuits for triple reel mowers are used to achieve dual use of hydraulic equipment.

That is, as shown in FIG. 4, three hydraulic motors 14, three on-off valves 15, a control valve 16, a variable throttle valve 17, a relief valve 18, and a hydraulic pump 19 are provided. A traveling hydraulic circuit for the three reel mowers 3,3,3 is constituted, and the three hydraulic valves 15 are used for the first hydraulic block a.
And a control valve 16, a variable throttle valve 17, and a relief valve 18
And the second hydraulic block b are respectively constituted. And
By providing another set of hydraulic circuits for the fourth and fifth reel mowers 5 and 5 with one hydraulic motor 14 and one open / close valve 15 removed, a hydraulic circuit for a 5-reel mower is provided. There is. However, the relief pressure of the relief valves 20 for the fourth and fifth reel mowers 5 and 5 is two-thirds (1 kg) for the three relief valves 18 (210 kg).
40 kg).

Next, a hydraulic circuit for driving the first to fifth reel mowers up and down will be described. As shown in FIG. 5, the oil discharged from the hydraulic pump 21 is supplied to a mower lifting / lowering pressure circuit A, a power steering circuit B, and a charge circuit C for HST via a flow dividing valve 22.

The mower lifting / lowering pressure circuit A includes three lift cylinders 2B for first to third reel mowers, two lift cylinders 4B for fourth and fifth reel mowers, a basic hydraulic block 23, And a lock circuit 24. The basic hydraulic block 23 includes the above-mentioned flow dividing valve 22, relief valve 25, control valve 26, pilot check valve 27
The lift lock circuit 24 includes two pilot check valves 29,
It is provided with two switching valves 30.

The operation of the mower lifting / lowering voltage circuit A is as follows. First, when the control valve 26 is switched from the neutral position n to the ascending position u, the pump pressure becomes five lift cylinders 2.
B, 2B, 2B, 4B, 4B and supplied to all
The fifth reel mowers 3, 3, 3, 5, and 5 are simultaneously raised. Next, in a state shown in the figure (a state in which the two switching valves 30 are both in the open position o), the control valve 26 is moved to the lower position d.
, The partial pressure of the pump pressure by the throttle 31 provided in the middle of the drain path is reduced to three pilot check valves 27 and 2.
9 and 29 to release their checking action, so that each lift cylinder 2B, 2B, 2B, 4B, 4B
Is drained by the weight of the reel mower, and the first to fifth reel mowers 3, 3, 3, 5, and 5 simultaneously descend by their own weight. That is, all five mowers can be moved up and down integrally by the switching operation of the control valve 26.

When the above-described lowering operation is performed in a state where the switching valve 30 is switched from the open position o to the lowering lock position r, the pilot check valve 29 is brought into a check function, and the control valve 26 is switched to the lowering position d. However, the oil is not discharged from the lift cylinder 4B. That is,
When the switching valve 30 is operated to the lowering lock position r, the fourth or fifth reel mower 5 to be operated can be locked so as not to lower from the position at that time. Therefore, the fourth
Alternatively, since the fifth or both of them can be locked at the raised position, it is possible to arbitrarily select the mowing operation using the three reel mowers 3 on the front side or the mowing work using the four reel mowers including the reel mower 5 on the left or right side of the machine. You can do it.

[Alternative Embodiment] Japanese Patent Application No. 9-2 filed earlier
As shown in FIG.
The operation system 30 and the operation system of the on-off valves 15 and 15 for the fourth and fifth reel mowers 5 and 5 are linked, and when the switching valve 30 is switched to the lowering lock position r, the fourth or fifth side of the machine body is switched. It is convenient if the hydraulic motor 14 of the fifth reel mower 5 is linked so as to stop.

[Brief description of the drawings]

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

FIG. 2 is an overall plan view of the lawn mower.

FIG. 3 is a rear view of a reel mower showing a configuration of left and right lifting link mechanisms.

FIG. 4 is a hydraulic circuit diagram for reel mower rotation drive.

FIG. 5 is a hydraulic circuit diagram for driving up and down the reel mower.

[Explanation of symbols]

 3 Reel mower on the front side of the fuselage 5 Reel mower beside the fuselage 2B, 4B Lift cylinder 30 Valve (switching valve) A Lifting hydraulic circuit o Opening position r Lowering lock position

Claims (2)

[Claims] 1. A first reel mower disposed in a central region in the left-right direction of a front part of a traveling machine body, and a first reel mower and a part of a cutting width are disposed on right and left sides of the first reel mower, respectively. The second and third reel mowers, the fourth reel mower disposed so that a part of the cutting width overlaps with the second reel mower at the left lateral position of the traveling body, and the right lateral position of the traveling aircraft. And a fifth reel mower disposed so that a part of the cutting width overlaps with the third reel mower, and a hydraulic pressure for swinging and lowering the first to fifth reel mowers individually with respect to the traveling machine body. An actuator, and a valve for closing the oil passage for the hydraulic actuator for raising and lowering the reel mower to prevent the lowered reel mower from lowering. Mower lifting device of riding lawn mower that is provided to each of the hydraulic circuits. 2. A lifting hydraulic circuit for raising and lowering all of the first to fifth reel mowers at the same time, and the fourth and fifth reel mower raising and lowering hydraulic circuits each include a mower. 2. The mower lifting and lowering device for a riding lawn mower according to claim 1, further comprising a switching valve that can be switched between an open position that allows lowering of the vehicle and a lowering lock position that prevents lowering of the mower.