JP2020089336A - Riding lawn mower - Google Patents

Abstract

To provide a riding lawn mower that is capable of mowing lawn at the uniform reaping height even if there is variation of a reaping load.SOLUTION: A riding lawn mower is provided for sending the lawn being mown by a mower 1 provided with a vehicle body frame 12 traveling with front wheels 18, 18 and rear wheels 21, 21 into a collector 3 using the blowing air of a blower 2. In the riding lawn mower, there are provided a mower drive motor MM for driving the mower 1, a mower load sensor MS for detecting a drive load of the mower drive motor MM, and a drive control device H for controlling the rotation of the blower drive motor BM for driving the blower 2. The rotation of the blower drive motor BM controls acceleration/deceleration according to the load detected by the mower load sensor MS.SELECTED DRAWING: Figure 7

Description

The present invention relates to a riding lawn mower for cutting and collecting lawn in a garden or a golf course.

Patent Document 1 discloses a mobile electric working machine as a riding lawn mower.

This mobile electric working machine is provided with a lifting mechanism for the working machine for mowing the lawn, and a technique of detecting the load of the working machine and adjusting the height of the working machine so as not to cause overload work is used.

JP, 2013-17437, A

When mowing turf with the above-mentioned mobile electric working machine and the mowing load fluctuates depending on the vegetation density of the turf, the mowing section, which is the working machine, moves up and down and the mowing depth of the turf fluctuates. It cannot be used as a grass surface.

An object of the present invention is to make it possible to mow a lawn with a uniform mowing height even if the mowing load of the riding lawn mower varies.

The problems of the present invention described above are solved by the following technical means.

The invention of claim 1 is a riding lawn mower in which lawn mowed by a mower 1 provided on a vehicle body frame 12 traveling with front wheels 18 and 18 and rear wheels 21 and 21 is fed to a collector 3 by blowing air from a blower 2. A mower drive motor MM to be driven, a mower load sensor MS to detect the drive load of the mower drive motor MM, and a drive control device H to control the rotation of the blower drive motor BM to drive the blower 2 are provided, and the mower load sensor MS is detected. The riding lawn mower is characterized in that the rotation of the blower drive motor BM is controlled to be accelerated or decelerated in accordance with the applied load.

According to the invention of claim 2, a blower rotation sensor BS for detecting the rotation speed of the blower 2 is provided, and when the blower rotation sensor BS detects a predetermined rotation speed or less, the drive controller H stops the rotation of the mower 1 and the blower 2 Is reversely driven for a predetermined time, and the riding lawn mower according to claim 1 is used.

The invention of claim 3 is the riding lawnmower according to claim 2, wherein the driving of the front wheels 18 and the rear wheels 21 is stopped when the blower 2 is driven in the reverse direction.

A fourth aspect of the present invention is a riding lawn mower in which lawn mowed by a mower 1 provided on a vehicle body frame 12 that travels with front wheels 18, 18 and rear wheels 21, 21 is fed to a collector 3 by blowing air from a blower 2. A drive control device H for switching between two-wheel drive for driving 18 and four-wheel drive for driving rear wheels 21, 21 together with front wheels 18, 18 is provided, and a front wheel rotation sensor 18S for detecting drive rotation of the front wheel 18 detects a slip of the front wheel 18. A riding lawn mower is characterized in that when it is detected, the drive control device H switches to four-wheel drive, and when slip is eliminated, it switches to two-wheel drive.

According to the invention of claim 1, when the mower 1 has a uniform depth and the lawn is partially mowed while the lawn density is high and the mowing load increases, the rotation of the blower drive motor BM that drives the blower 2 is increased to remove the lawn. Since it is efficiently sent to the collector 3, it is possible to form a lawn surface with a uniform depth without changing the cutting depth depending on the density of the lawn cutting, without delaying the lawn transportation.

According to the invention of claim 2, in addition to the effect of claim 1, when the blower rotation sensor BS detects that the lawn conveyance by the blower 2 is clogged and the rotation is reduced due to an increase in load, the drive control device H Rotate the blower 2 in the reverse direction and discharge it to the side of the clogged mower 1 to clear the clog.

According to the invention of claim 3, in addition to the effect of claim 2, the traveling of the vehicle body frame 12 is stopped even if the cutting lawn is reversely injected to the mower 1 side by the reverse rotation of the blower 2, so the lawn surface is disturbed. There is nothing.

In the invention of claim 4, the normal cutting operation is a two-wheel drive in which only the front wheels 18 and 18 are driven and does not disturb the vegetation of the lawn, and the front wheels 18 and 18 slip and the traveling direction of the body frame 12 changes. When the vehicle is about to be disturbed, the drive control device H drives the four wheels to drive the front wheels 18 and 18 as well as the rear wheels 21 and 21 to stabilize the traveling, so that various lawns can be reliably traveled and good mowing work can be performed.

It is the whole right view of a riding lawn mower. It is the whole top view which abbreviated a part of riding lawn mower. It is the whole rear view of a riding lawn mower. It is a top view of a right and left rear wheel part. It is a cutting side view of a rear wheel part. It is a side view at the time of a collector rise of a riding lawn mower. It is a control block diagram of each drive motor.

Embodiments of the present invention will be described below with reference to the examples shown in the drawings. In the description of the embodiments, the left and right directions are referred to as left and right, respectively, and the forward direction is referred to as the front direction and the backward direction is referred to as the rear direction toward the forward direction of the airframe, but the configuration of the present invention is not limited thereto.

The structure and operation of the riding lawn mower will be described.

The riding lawn mower of the present embodiment includes a mower 1 which is connected to a lower part of a front side of the vehicle body so as to be able to move up and down, and mowers 1 for cutting turf grass, a blower 2 for sucking and conveying the turf grass cut behind, and a rear side thereof It is provided with a collector 3 for accommodating the grass that has been cut.

A driver's seat 4 is provided on the front side of the vehicle body. A steering wheel 6 for steering operation and an operation panel 7 are provided on a handle post 5 on the front side of the driver's seat 4, and a forward pedal 9f, a backward pedal 9r, a brake pedal 10 and the like are provided at step 8. Has been.

The vehicle body frame 12 that supports the driver's seat 4, the handle post 5, the step 8 and the like includes a rear engine 13, a transmission case 14 integrally connected to a front side portion of the engine 13, and a transmission case 14 to the front side. A front frame portion 15 that is integrally connected so as to extend and a rear frame portion 16 that is integrally connected so as to extend rearward from the engine 13 are connected to each other. That is, by connecting the rear side portions of the pair of left and right front frame portions 15, 15 to the left and right side surfaces of the transmission case 14, and directly mounting the engine 13 on the rear side portion of the transmission case 14 via the spacers, The body frame 12 is formed by rigidly connecting four members.

The front axle 17 is mounted on the left and right front frame portions 15, 15, and the left and right front wheels 18, 18 are provided on both the left and right sides of the front axle 17 via left and right front wheel drive motors Mf, Mf.

The left and right rear frame parts 16, 16 are configured to be slightly narrower in the vertical direction than the left and right front frame parts 15, 15, and are refracted so that the rear half is higher than the front half in a side view. Left and right rear axles 20, 20 are mounted on the frame portions 16, 16 via pivot shafts 19 in the vertical direction so as to be steerable and swingable. Left and right rear wheels 21, 21 are arranged on both left and right sides of the left and right rear axles 20, 20 via left and right rear wheel drive motors Mr, Mr.

A generator G that supplies electric power to the left and right front wheel drive motors Mf, Mf, Mr, and Mr that respectively drive the left and right front wheels 18, 18 and the left and right rear wheels 21, 21 is provided behind the engine 13 as described later. There is.

The electric power generated by the generator G is supplied to the front wheel drive motor Mf that drives the front wheels 18 and 18 and the rear wheel drive motor Mr that drives the rear wheels 21 and 21, and drives the mower motor MM that drives the mower 1 and the blower 2. Is supplied to the blower motor BM.

The mower 1 and the blower 2 are communicated with each other by a front side portion of a conveying chute 25 that conveys the cut grass, and a rear end portion of the conveying chute 25 faces a front opening portion of the collector 3.

Left and right guard struts 26, 26 are erected on the left and right sides between the driver's seat 4 and the collector 3 on the body frame 12. As shown in FIG. 6, the left and right guard struts 26, 26 are pin-connected to the front end of an elevating link mechanism 27 for elevating and lowering the collector 3, and a frame frame member 28 is provided on the upper rear side of the elevating link mechanism 27 about the axis in the left-right direction. The upper end of the base is pivotally connected. A lower end portion of the frame frame member 28 is rotatably supported by a fulcrum support shaft 29 penetrating the lower rear portion of the collector 3 in the left-right direction so that the elevator link mechanism 27 and the frame frame member 28 are connected to each other. The space between them is connected by a stretchable dump cylinder mechanism 31.

The lower parts of the left and right guard columns 26, 26 and the lower end of the rearward-inclined elevating link mechanism 27 are pin-connected with the elevating cylinder 30, and the upper end of the elevating link mechanism 27 is pin-connected with the lower front part of the dump cylinder mechanism 31. As the lifting cylinder 30 extends, the lifting link mechanism 27 moves upward to move the collector 3 upward, and the lifting cylinder 30 contracts to move the collector 3 downward. In addition, the collector 3 is dumped by the extension operation of the dump cylinder mechanism 31, the collector door 3a is opened and rotated by its own weight to discharge the turf grass backward, and the contraction operation is performed to perform the dump return operation.

As shown in FIG. 5, the power from the rear end of the crankshaft 22 of the engine 13 is transmitted to the generator G via the output pulley 33, the transmission belt 34, the input pulley 35, and the generator input shaft 36. The generator G is configured to receive power and drive a built-in power generation mechanism (both not shown) to supply predetermined power. The generated electric power is supplied to each of the left and right front wheel drive motors Mf, Mf, Mr, Mr, and has a known configuration for driving the left and right front wheels 18, 18 and the left and right rear wheels 21, 21 respectively.

Of the constituent elements of the vehicle body frame 12, the rear side portions of the left and right rear frame portions 16, 16 are connected by a first plate 40 extending in the left-right direction and in the vertical direction, and the first plate 40 is connected in front of the generator G. The bolts are fastened to the side surfaces, and they are arranged behind the engine 13 so as to face each other through a space.

The generator input shaft 36 is supported on the mounting side of the engine 13 above the first plate 40, the input pulley 35 is mounted on the front end of the generator input shaft 36, and the rear side of the generator input shaft 36 is mounted. The rotation input part of the generator G is detachably attached.

A transmission belt 34 is stretched between the output pulley 33 of the crankshaft 22 of the engine 13 and the input pulley 35 so as to extend in the up-down direction, and the output pulley 33 is rotated via the input pulley 35. It is transmitted to the generator input shaft 36.

The input pulley 35 and the generator input shaft 36 are arranged on the front side of the first plate 40, and the generator G main body is mounted on the rear side of the first plate 40. Further, the output pulley 33 and the input pulley 35 of the crankshaft 22 are provided. Are vertically stacked in a plan view, the mounting configuration of the generator G disposed behind the engine 13 is simplified and made compact, and the overall length of the machine body is shortened.

Further, the output pulley 33 of the crankshaft 22 is provided with one belt-pulley portion 37 for driving the generator 38 mounted on the rear side surface of the engine 13.

By supporting the front end portion of the support member of the pivot shaft 19 on the lower side portion of the first plate 40 extending downward from the shaft support portion of the generator input shaft 36, the pivot shaft 19 is extended to the engine 13 side. The close arrangement is facilitated to achieve compactness.

The rear end portion of the support member of the pivot shaft 19 is connected by a second plate 41 in the left-right direction and the vertical direction, and the upper portions of the first plate 40 and the second plate 41 are connected and reinforced by a reinforcing plate 39. .. A support member of the pivot shaft 19 is swingably supported around a longitudinal axis, and a rear axle 20 that supports the left and right rear wheels 21 and 21 is swingably supported by the pivot shaft 19.

As shown in FIG. 5, a hood 51 is provided to cover the upper surface, upper left and right side surfaces, and the rear side surface of the engine 13 and the generator G. The hood 51 has a structure in which the rear side can be opened and rotated upward with the front upper part as a fulcrum, and can be held in an open state. When the hood 51 is returned and rotated to the lower closed state, an action of an appropriately provided stopper (not shown) is provided. It is configured to be locked in place by.

When the hood 51 is opened and rotated, the collector 3 can be raised as shown in FIG. 6, the rear handle 51a of the hood 51 can be lifted, and the hood 51 can be opened and rotated upward as desired to the front fulcrum.

A damper (not shown) is provided between the hood 51 and the machine body frame 12 so that the hood 51 can be maintained in the open posture. In this open state, the operator can turn to the rear of the machine and perform correction adjustment and maintenance around the generator G from the rear side of the engine 13.

As shown in FIGS. 5 and 6, an intermediate frame 52 having a U-shape in plan view is provided to reinforce the hood 51 at a position corresponding to the upper surface of the hood 51 in the closed state. The intermediate frame 52 not only protects the engine 13, but also protects auxiliary devices around the engine 13 and traveling system oil passages.

In FIG. 5, a gear pump chamber 55 is provided on the rear side of the generator G, and the gear pump chamber 55 receives a rotational power from a generator input shaft 36 of the generator G and is driven by a pump in the front-rear direction. A shaft 56 is provided, and a small diameter gear pump 55a is provided on both front and rear sides of the pump shaft 56. The gear pump 55 a supplies and discharges pressure oil to and from the steering hydraulic cylinder mechanism 57, the mower lifting hydraulic cylinder mechanism 58, the collector lifting elevator cylinder 30, and the dump cylinder mechanism 31.

In addition, as shown in FIGS. 4 and 5, the rear upper surface of the hood 51 is formed as a rearwardly slanted surface 51b, and the rear left and right side surfaces are each configured as a slanted surface 51c whose width becomes narrower toward the rear side. There is.

As shown in FIG. 2, the left and right rear wheels 21 and 21 and the driving left and right rear wheel drive motors Mr and Mr are connected to the left and right rear axles 20 via steering support members such as steering left and right king pins 60 and 60. It is provided to be steerable. The steering hydraulic cylinder mechanism 57 is interposed between the left and right tie rods 61, 61 connecting the steering support members of the left and right rear wheel drive motors Mr, Mr to the left and right sides, and the left and right telescopic rods of the steering cylinder mechanism 57 are moved to the left and right. Pins are connected to the left and right tie rods 61, 61 of the wheels 21, 21 and the left and right rear wheels 21, 21 can be steered by interlocking the left and right rear wheels 21 and 21 with the steering cylinder mechanism 57 in accordance with the left and right turning operation of the steering handle 6.

As shown in FIG. 2, in the mower deck 1a of the mower 1, two blades are rotatably supported around the vertical axis, and the left vertical axis passes from the transmission case 14 through the second transmission output shaft 24. The mowing power is transmitted, and the mowing power is also branched and transmitted to the vertical axis on the other side.

As shown in FIGS. 1 and 2, the mower deck 1a is configured so that the front side portions of the elevating links 65, 65 attached to the left and right front frame portions 15, 15 so as to be able to ascend and descend are connected so as to be vertically rotatable. Can be changed to a grounding work posture and a non-grounding posture.

The mower raising/lowering hydraulic cylinder mechanism 58 is provided between the working arm portion 65a of the raising/lowering links 65, 65 and the machine body frame portion, and the mower deck 1a is raised/lowered by the expansion/contraction operation of the mower raising/lowering hydraulic cylinder mechanism 58. There is.

Attached to the left and right front side frame portions 15, 15 are left and right V-shaped frame portions 66, 66 in which the front curved frame portion and the vertical frame portion are integrally rigidized (shown in FIG. 1). 66 and 66 are connected by a horizontal frame portion 67 in the left-right direction to form support bases 68, 68, and the bases of the left and right guard supports 26, 26 are firmly supported.

An open/close support shaft (not shown) along the left-right direction of the hood 51 is supported via the horizontal frame portion 67 or a bracket extending from the horizontal frame portion 67, and the collector 3 is in a raised posture. Under the condition, the rear side portion of the hood 51 can be opened and rotated largely upward.

As shown in FIGS. 4 and 5, the left and right rear frame portions 16 and 16 have rear end portions connected by a horizontal frame portion 70 that is longer in the left and right than the left and right spacing portions to be rigidified. The lateral frame portion 70 is configured to be able to receive the rear lower end portion of the hood 51, and is configured to receive the downward load of the collector 3.

FIG. 7 shows a control block diagram of each electric motor.

The drive control device H is provided with a mower load sensor MS, a blower rotation sensor BS, and a front wheel rotation sensor 18S on the signal input side, each detection signal is input, and a mower drive motor MM and a blower drive motor BM on the control output side. A front wheel drive motor Mf and a rear wheel drive motor Mr are provided and each control signal is output.

The drive controller H is controlled as follows.

When the load detected by the mower load sensor MS is a predetermined load, the blower drive motor BM is driven to rotate at a constant rotation speed. However, when the load decreases, the rotation speed decreases, and when the load increases, the rotation speed increases. To do.

Further, when the rotation speed of the blower rotation sensor BS detects a predetermined low rotation speed or less, the rotation stop is output to the mower driving motor MM, the rotation of the blower 2 is reversely driven for a predetermined time, and then the normal rotation driving is started, whereby the conveyance is performed. Clear the jam and restart the transport.

When the blower 2 is driven in the reverse direction, a stop signal is output to the front wheel drive motor Mf and the rear wheel drive motor Mr to stop driving the front wheels 18, 18 and the rear wheels 21, 21.

Further, in a normal lawn mowing work, a drive signal is output to the front wheel drive motor Mf to drive the vehicle body frame 12 by two-wheel drive of only the front wheels 18, 18, but the front wheel rotation sensor 18S causes the front wheels 18, 18 to slip. When detected, a drive signal is output to the rear wheel drive motor Mr to drive the rear wheels 21 and 21 to switch to four-wheel drive to run, and when the slip is resolved, a stop signal is output to the rear wheel drive motor Mr to drive two wheels. Switch to. The wheel slip is determined by the fact that the traveling speed does not correspond to the motor drive rotation speed.

1 mower 2 blower 3 collector 12 body frame 18 front wheel 21 rear wheel 85 load control device MM mower electric motor MS mower load sensor BM blower electric motor BS blower rotation sensor H drive switching means

Claims (4)

A lawnmower for riding, in which lawn mowed by a mower (1) provided on a vehicle body frame (12) running on front wheels (18, 18) and rear wheels (21, 21) is sent to a collector (3) by blowing air from a blower (2). At a mower drive motor (MM) for driving the mower (1), a mower load sensor (MS) for detecting a drive load of the mower drive motor (MM), and a blower drive motor (BM) for driving the blower (2). ) Is provided to control the rotation of the blower drive motor (BM) according to the load detected by the mower load sensor (MS). Machine. A blower rotation sensor (BS) for detecting the rotation speed of the blower (2) is provided, and when the blower rotation sensor (BS) detects a predetermined rotation speed or less, the drive controller (H) rotates the mower (1). 2. The riding lawn mower according to claim 1, wherein the blower (2) is reversely driven for a predetermined time by stopping the operation. The riding lawn mower according to claim 2, wherein the driving of the front wheel (18) and the rear wheel (21) is stopped when the blower (2) is driven in the reverse direction. A lawnmower for riding, in which lawn mowed by a mower (1) provided on a vehicle body frame (12) running on front wheels (18, 18) and rear wheels (21, 21) is sent to a collector (3) by blowing air from a blower (2). A drive control device (H) for switching between two-wheel drive for driving the front wheels (18, 18) and four-wheel drive for driving the rear wheels (21, 21) together with the front wheels (18, 18). When the front wheel rotation sensor (18S) for detecting the drive rotation of (18) detects the slip of the front wheel (18), the drive control unit (H) switches to four-wheel drive, and when the slip is eliminated, it is switched to two-wheel drive. Characteristic riding lawn mower.

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