JPH0646634A - Mower fitting structure in lawn mower - Google Patents

Abstract

PURPOSE:To provide a structure designed to reduce the back-and-forth movement of a mower by suspendedly setting up a link in the direction against the energetizing force for mower movement owing to the belt tension for a belt interlocking mechanism. CONSTITUTION:Mechanical power is inputted, from a rear-set engine 5 via the belt of a belt interlocking mechanism 23 into a mower 5 suspendedly set up through a quadruple link mechanism D composed of operational links 25, 26 and rods 27, 28. A link 39 in a lying attitude is suspendedly set up between the mower and traveling machine body 4, and the belt tension for the mechanism 23 is compensated by the tension of the link 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower mounting structure for a small-sized mid-mount lawn mower, and more specifically, to a technique for enabling an up and down adjustment operation of a mower while inputting power from a vertical axis type engine. Regarding

[0002]

2. Description of the Related Art A small riding lawn mower capable of cutting a lawn lawn lawn lawn mower that is as labor-intensive as the walking lawn mower is as easy as the present applicant. There is one proposed in Japanese Patent Application No. 3-333100 filed by K.K. This is to provide a compact mid-mount lawn mower with the overall length suppressed as much as possible by adopting an integrated transmission structure in which the vertical axis type engine is located behind the seat and the belt transmission is transmitted to the traveling mission and the mower. is there.

[0003]

In the above-mentioned small-sized mid-mount lawn mower, the gap between the front and rear wheels and the mower in the front-rear direction is set to be extremely small for the purpose of suppressing the overall length. By interposing a four-link mechanism consisting of short links in the front and rear and front and rear rods in a standing posture, movement of the mower in the fore-and-aft direction due to vertical adjustment is prevented as much as possible. However, in this link mechanism, the mower is free to move in the front-rear direction and its positioning is not performed.Because of the belt tension acting on the engine output shaft and the mower input shaft, the mower is displaced rearward, and depending on the case, Since there is a risk of contact with the rear wheels, a general mower suspension in which a long link member along the belt tension direction is installed between the mower and the machine body, as shown in JP-A-4-66328. It is possible to counter the belt tension by following the installation structure. However, it is physically difficult to provide a link attachment fulcrum on the lower abdomen of the fuselage behind the mower, which is a place where a driving mission and multiple transmission mechanisms are intertwined in a narrow space, and another solution is devised. Must. An object of the present invention is to realize a mower mounting structure capable of counteracting belt tension while making the most of the mower suspension structure having a small forward and backward movement by a four-link mechanism.

[0004]

In order to achieve the above-mentioned object, the present invention provides a power transmission through a belt interlocking mechanism arranged in a substantially horizontal direction at a lower abdomen of a traveling body between front wheels and rear wheels. A mower to which is input is arranged, and the mower is moved up and down via a four-link mechanism composed of a front rod and a rear rod in a standing posture interposed between the front portion and the rear portion of the mower. It is possible to hang it on the traveling machine body and to lay a link in a recumbent posture, which is longer than the front and rear rods, between the mower and the traveling machine body, and urge movement of the mower by the belt tension of the belt interlocking mechanism. The erection direction of the link is set such that the direction and the pulling direction of the link are substantially the same or substantially the same.

[0005]

In other words, by constructing the reclining posture link against the belt tension over the mower and the mower on the side where the engine is not arranged with respect to the mower, there is a relatively extra space where the transmission structure is not complicated. It becomes possible to provide a fulcrum for attachment of the link to the fuselage at the location. Since the link is set to be longer than the rod for suspending the mower, the movement of the mower in the fore and aft due to the rocking of the mower when adjusting the elevation of the mower can be minimized, and the 4-link mechanism is adopted. It is possible to eliminate mower movement due to belt tension without compromising the front-rear length compactness. Since the link opposes the belt tension by its pulling force, it is not necessary to consider the anti-buckling strength as compared with the structure that opposes in the compression direction (the structure of the above-mentioned Japanese Patent Laid-Open No. 4-66328). Can be lightened. According to the characteristic configuration, there are a structure in which the engine output shaft is at the front part of the machine body and the link is attached to the rear part of the machine body and a structure in which the engine output shaft is at the rear part of the machine body and the link is attached to the front part of the machine body. In the structure, both the mower pulling direction and the belt tension as the aircraft progresses act in the link pulling direction, which makes the link lighter than the former structure and also reduces the backlash of each mounting part due to the mower mounting configuration. By aligning the mowers in the traveling direction, it becomes possible to exert the effect of making it difficult for the mower to swing in the front-back direction during lawnmower work.

[0006]

Therefore, by devising the structure for providing the link mounting portion on the side opposite to the engine installation side, the compact mid adopts a mower suspension structure with a four-link mechanism with a little back-and-forth movement while reducing the weight of the link itself. We were able to provide a mount lawn mower.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 shows a side view of the mid-mount type lawnmower, and FIG. 5 shows an enlarged side view of the rear part thereof. 1 is a front steering wheel, 2 is a drive rear wheel, A is a drive part, B is a control part, and C is a control part. Is a transmission part, 3 is a mower, and 4 is an airframe. Driving part A
Is composed of a vertical axis type engine 5, an engine bonnet 6, an air cleaner 8, a carburetor 9 and the like, and is mounted on the body frame 4. The control unit B has a handle 10
Front panel 11 with step floor 12
And the driver's seat 13, the driver's seat 13 is located immediately in front of the engine 5, and the driver's seat 13
The battery 15 is installed inside the floor cover 14 that covers the lower part of the
And a fuel tank 16 is provided. The transmission portion C is a first belt that extends over an HST (hydrostatic type continuously variable transmission) 18 arranged on the rear side of the rear axle 17, an input shaft 19 of the HST 18, and a crankshaft 20 protruding downward from the machine body frame 4. It is composed of an interlocking mechanism 21, a second belt interlocking mechanism 23 and the like extending over the crankshaft 20 and the input cutting blade shaft 22 of the mower 3, and the rear axle 17 and the differential mechanism 24 are inside a casing 18a that houses the HST 18. To be equipped with.

Next, the mower 3 and its transmission structure will be described in detail. As shown in FIGS. 1 to 6, the mower 3 includes front and rear operation links 25, 26 and front and rear rods 27, 26.
And a driven cutting blade shaft 3 which is hung on the machine body frame 4 by a four-link mechanism D and is driven by the input cutting blade shaft 22 and a third belt interlocking mechanism 29.
It is configured as a two-blade type in which 0 is provided and two rotary blades 31 are mounted on the cutting blade housing 32. The rear link 26 to which the elevating lever 33 is attached and the front link 25 are interlockingly connected by a connecting link 34, and the elevating lever 33 is provided on the left side of the driver's seat 13. Cutting blade housing 3
A round bar (corresponding to a shaft member) 36 is installed in a fixed state across the left and right at two rear portions of the round bar 36 via two mounting brackets 35 fixed to both ends. While supporting a pair of left and right rear rods 28, 28 on the left and right substantially central positions of the round bar 36 and the brake pedal 3.
A tension link 39 in a recumbent posture is provided so as to extend across a front bracket 38 on which 7 and the like are supported. The tension link 39 counteracts that the mower 3 is pulled backward by the belt tension of the second belt interlocking mechanism 23. As shown in FIG. 2, on the round bar 36, the two connecting plates 41, 41 in a swingable state are fixedly attached between the two washers 40, 40 fixed by welding. The tension link 39 and the round bar 36 are detachably connected to each other by sandwiching and fixing the rear portion of the link 39 with two bolts.

The second belt interlocking mechanism 23 is constructed by winding a belt around the engine pulley 43, the input pulley 42 of the input cutting blade shaft 22 and the tension pulley 44, and uses the tension pulley 44 to make a PTO clutch.
The brake mechanism E is configured. That is, as shown in FIGS. 1, 3, and 4, a brake shoe 45 a capable of making contact with the input pulley 42 is attached to a tension arm 45 which is swingable around a vertical fulcrum P that rotatably supports the tension pulley 44. A brake spring 46, which is attached and biases the tension arm 45 toward the brake side, and an operation wire 48 having a tension spring 47 interposed are connected to the tension arm 45. That is, when the PTO clutch lever 49 is operated to the entry side, the brake spring 46
The operation wire 48 is pulled against the urging force of the cutting blade, the belt is tensioned by the tension spring 47, and the cutting blade clutch in which the second belt interlocking mechanism 23 functions is engaged.
When the TO clutch lever 49 is operated to the disengagement side, the operation wire 48 is loosened, the tension spring 47 does not function, the second belt interlocking mechanism 23 stops transmitting, and the cutting blade clutch is disengaged. The brake shoe 45a is pressed against the input pulley 42 to immediately stop the inertial rotation of the rotary blades 31, 31 at the same time as the cutting blade clutch is disengaged. The third belt interlocking mechanism 29 uses a transmission pulley 50 attached to the lower side of the input pulley 42, and includes a tension pulley 52 that is biased by a winding spring 51.

As shown in FIGS. 1 and 3, the input pulley 42
A belt cover 53 made of a bent plate material for partially covering the outer periphery of the input pulley 42 is attached to the cutting blade housing 32, and the belt 54 extends along the inner peripheral surface of the belt cover 53 when the cutting blade clutch is disengaged. It is designed to obtain an effective transmission disconnection state by breaking contact with.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a plan view of a mower portion.

FIG. 2 is a perspective view showing a connection structure of a tension link and a round bar.

FIG. 3 is a cross-sectional view of the main part showing the structure near the input shaft of the mower.

FIG. 4 is a system diagram showing the structure and operation of a PTO clutch / brake.

FIG. 5 is a sectional side view of the rear part of the lawn mower.

[Figure 6] Overall side view of the lawn mower

[Explanation of symbols]

 1 front wheel 2 rear wheel 3 mower 4 traveling machine body 23 belt transmission mechanism 27 front rod 28 rear rod 39 link D 4 link mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuyuki Yamashita Nobuyuki Yamashita 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) Inventor Akira Minoura 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house

Claims (1)

[Claims] 1. Power is input to a lower abdomen of a traveling body (4) between a front wheel (1) and a rear wheel (2) via a belt interlocking mechanism (23) arranged in a substantially horizontal direction. The mower (3) is disposed, and the front and rear rods (27), () in a standing posture are installed between the front and rear portions of the mower (3) and the traveling body (4). 28) is suspended from the traveling machine body (4) via a four-link mechanism (D) composed of 28) and has a length longer than that of the front and rear rods (27) and (28). The long recumbent link (39) is connected to the mower (3) and the traveling body (4).
And the link (3) and the moving and urging direction of the mower by the belt tension of the belt interlocking mechanism (23).
A mower mounting structure for a lawn mower in which the erection direction of the link (39) is set in a state where the pulling direction of 9) matches or substantially matches.