JP2000309285A - Work vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] When a work vehicle is provided with a step in a riding section, it is intended to reduce the weight of the step and simplify the production process. A step 8 includes an upper layer forming section, a lower layer forming section, a vertical wall section connecting the upper layer and the lower layer forming section, and a hollow section A surrounded by the upper layer forming section, the lower layer forming section and the vertical wall section. Step 8 is formed of a hollow resin molded product. A concave portion into which the control portion in which the steering wheel is disposed is provided at the front portion of the step 8, and a hollow portion A is provided at the concave portion of the step 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle such as a riding lawn mower or a relatively small tractor, and more particularly, to a seat at a middle portion between upper surfaces of a rear wheel fender that covers a range above right and left rear wheels. The present invention relates to a fender structure of a working vehicle configured to attach a fender.

[0002]

2. Description of the Related Art In recent years, in order to reduce the weight of a work vehicle and simplify a manufacturing process, parts such as steps and fenders that form a traveling body of the work vehicle are formed by press forming a sheet metal material. Instead, resin moldings having relatively high strength are often used. Therefore, conventionally, by forming a reinforcing rib integrally with the base material of the resin molded product by injection molding, a resin molded product having relatively high strength has been obtained.

[0003]

However, in order to form a large reinforcing rib integrally with the base material of the resin molded product in order to obtain a resin molded product having higher strength by injection molding, the reinforcing rib is formed. The surface of the base material shrinks,
Since the thickness of the base material portion is smaller than the thickness of the other base material portions and the strength is generally low, the reinforcing ribs cannot be made too large, and a higher strength cannot be obtained. In addition, since the surface is shrunk, the appearance quality must be reduced.

An object of the present invention is to obtain a fender structure of a work vehicle that is lighter and has higher strength without deteriorating the appearance quality.

[0005]

In order to achieve the above object, according to the present invention, there is provided a fender structure for a working vehicle in which a seat is attached to a middle portion between upper left and right upper surfaces of a rear wheel fender which covers a portion above right and left rear wheels. In the above, the rear wheel fender is formed of a hollow resin molded product by blow molding, and a resin material overlapping portion is provided corresponding to a seat mounting portion thereof, and a lower surface of the resin material overlapping portion is supported on the body frame side. It was configured to be supported by a member.

[0006]

According to the present invention, no shrinkage occurs on the surface of the resin molded product by increasing the strength of the resin molded product unlike the injection molding. In addition, since the direct load caused by the driver's boarding is directly applied to the support member, it is not necessary to unnecessarily increase the thickness of the resin molded product.

[0007]

As described above, according to the present invention, the strength can be increased without deteriorating the appearance quality. In addition, the weight can be reduced as compared with the case where the strength to endure a direct load caused by the ride of the driver is provided. In other words, it is possible to obtain a fender structure of a work vehicle that is lighter and has higher strength without deteriorating the appearance quality. Moreover,
By arranging the resin material polymerization part corresponding to the seat mounting part, the seat can be easily attached,
The ability to be lighter in weight has made it possible to improve steering performance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a mid-mounted riding lawn mower will be described below with reference to the drawings. [First Embodiment] As shown in FIG. 1, a riding lawn mower includes a bonnet 2 forming an engine room at the front of a traveling machine body 1, a longitudinal axis type engine 3 mounted in the engine room, and a traveling machine. A front wheel 4 provided at a front part of the vehicle body 1, a rear wheel 5 provided at a rear part of the traveling body 1, a control panel 7 forming a front part of a riding part 6 located between the front wheel 4 and the rear wheel 5, Step 8, forming a scaffold of the riding section 6, a rear wheel fender 9 that covers the upper part of the left and right rear wheels 5 and forms a rear part of the riding section 6, and is attached to a middle part of the upper surface of the rear wheel fender 9 in the left and right. Seat 10, front wheel 4 and rear wheel 5
And a mower 12 connected to the lower abdomen of the traveling body 1 via a link mechanism 11 so as to be able to move up and down.

Power from the engine 3 is transmitted to a mower 12 and a transmission case 14 for driving the rear wheels 5 through a belt transmission mechanism 13 configured in two systems.

Each of the hood 2, the control panel 7, the step 8, and the rear wheel fender 9 is made of a resin material so as to reduce the weight of the traveling body 1 and simplify the manufacturing process. As shown in FIG. 1, a bonnet 2 includes a lower bonnet 2A fixedly attached to the traveling body 1 and an upper bonnet 2 attached to the lower bonnet 2A so as to swing freely around a front horizontal axis.
B.

As shown in FIGS. 2 to 7, the step 8 and the rear wheel fender 9 are integrally formed by a blow molded hollow resin molded product. And the strength of the rear wheel fender 9 is increased. In addition, a resin material overlapping portion B in which resin materials overlap each other is provided corresponding to a seat mounting portion 9A which is a left and right middle portion of the upper surface of the rear wheel fender 9, and a lower surface of the resin material overlapping portion B is attached to the body frame. By supporting the support member 16A on the 16 side, a direct load when a driver sits on the seat 10 is applied to the support member 16A without being applied to the rear wheel fender 9. A water inlet A1 for injecting water into the hollow portion A is formed in an upper portion of the hollow portion A, and a drainage port A2 for discharging water from the hollow portion A is formed in a lower portion of the hollow portion A. I have. Then, by pouring water from the water inlet A1 into the hollow portion A to increase the weight of the rear side of the traveling body 1 and increase the ground load of the rear wheel 5, the improvement of the climbing performance when working on a slope is improved. By reducing the weight of the traveling body 1 by draining the water from the drain port A2, it is possible to improve the steering performance when working on level ground.

As shown in FIG. 8 to FIG.
Is composed of a resin molded product by injection molding. When the control panel 7 is injection-molded, the high-pressure gas is fed from an injection gate 7A for injecting a resin material to a portion forming the basic skeleton of the control panel 7, thereby suppressing a reduction in appearance quality due to shrinkage and a hollow rib 7B. Is formed to increase the strength of the control panel 7. Further, it is possible to compensate for a decrease in flow characteristics when glass fibers such as fillers are contained in the resin material in order to increase the strength of the material.
Incidentally, reference numeral 17 in the drawing denotes a plug for closing the injection gate 7A formed for feeding high-pressure gas.

[Second Embodiment] As shown in FIGS. 11 to 13, in this embodiment, each of the step 8 and the rear wheel fender 9 is formed of a separate hollow resin molded product by blow molding. By forming a hollow portion A in each of the step 8 and the rear wheel fender 9, the strength of the step 8 and the rear wheel fender 9 is increased. As in the case of the first embodiment, a resin material overlapping portion B in which resin materials overlap with each other is provided corresponding to a seat mounting portion 9A which is a left and right middle portion of the upper surface of the rear wheel fender 9. or,
A hollow portion A is provided above the hollow portion A of the rear wheel fender 9.
A water inlet A1 is formed below the hollow portion A of the rear wheel fender 9, and a drain port A2 for draining water from the hollow portion A is formed.

[Embodiment 3] As shown in FIGS. 14 to 16, in this embodiment, as in the second embodiment, each of the step 8 and the rear wheel fender 9 is formed of a separate resin molded product. However, step 8 is made of a resin molded product by injection molding similar to the control panel 7 of the first embodiment,
The rear wheel fender 9 is formed of a hollow resin molded product as in the second embodiment. That is, in step 8, the hollow ribs 8B are formed while suppressing the deterioration of the appearance quality due to the shrinkage by sending the high pressure gas from the injection gate 8A for injecting the resin material during the injection molding to the portion requiring reinforcement in step 8. Thus, the strength of step 8 is increased. Further, it is possible to compensate for a decrease in flow characteristics when glass fibers such as fillers are contained in the resin material in order to increase the strength of the material. Incidentally, reference numeral 17 in the drawing denotes a plug for closing the injection gate 8A formed to feed the high-pressure gas. On the other hand, as in the case of the second embodiment, the rear wheel fender 9 is provided with a water inlet A1 for injecting water into the hollow part A above the hollow part A, and a hollow part below the hollow part A. A drain port A2 for draining from A is formed.

[Modifications] The present invention is not limited to the above embodiment. For example, the working vehicle in the present invention may be a riding rice transplanter or a relatively small tractor. Further, as a hollow resin molded product by blow molding, a water injection port A1 for injecting water into the hollow portion A, and
The drainage port A2 for draining from the hollow portion A may not be formed.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a step and a rear fender.

FIG. 3 is a sectional view taken along line aa in FIG. 2;

FIG. 4 is a sectional view taken along line bb in FIG. 2;

FIG. 5 is a sectional view taken along the line c-c in FIG. 2;

FIG. 6 is a sectional view taken along line dd in FIG. 2;

FIG. 7 is a sectional view taken along the line ee in FIG. 2;

FIG. 8 is a partially cutaway side view of the control panel.

FIG. 9 is a partially cutaway rear view of the control panel.

FIG. 10 is a cross-sectional plan view of the control panel.

FIG. 11 is a plan view of steps in the second embodiment.

FIG. 12 is a plan view of a rear fender in the second embodiment.

FIG. 13 is a longitudinal sectional side view of a step and a rear fender in the second embodiment.

FIG. 14 is a plan view of the steps in the third embodiment.

15 is a sectional view taken along line ff in FIG. 14;

FIG. 16 is a sectional view taken along line g-g in FIG.

[Explanation of symbols]

 Reference Signs List 5 left and right rear wheels 9 rear wheel fender 9A seat mounting part 10 seat 16 fuselage frame 16A support member B resin material overlapping section

Claims (6)

[Claims] An upper layer forming section (8a) and a lower layer forming section (8).
b), a vertical wall portion (8c) connecting the upper and lower layer forming portions (8a) and (8b), and the upper layer forming portion (8a);
A step (8) comprising a lower layer forming portion (8b) and a hollow portion (A) surrounded by a vertical wall portion (8c);
The step (8) is formed of a hollow resin molded product, and a recess (8d) into which a control section (7) in which a control handle (15) is arranged is provided at a front portion of the step (8). A work vehicle having the hollow portion (A) in the concave portion (8d) of the step (8). 2. The work vehicle according to claim 1, wherein the step (8) is formed of a hollow resin molded product by blow molding. 3. A step (8) arranged in the riding section (6), and a rear structural section (9) connected to the rear of the step (8) and located at a higher position than the step (8). The rear structure (9) is provided with a seat (1
0), the upper layer forming portions (8a) and (9a) and the lower layer forming portion (8
b), (9b), and the upper and lower layer forming portions (8a),
A vertical wall (8) connecting (9a), (8b) and (9b)
c) and (9c), and the upper layer forming portions (8a) and (9c).
a), lower layer forming portions (8b) and (9b) and vertical wall portions (8
c) and (9c), the step (8) and the rear structural part (9) are provided, and the step (8) and the rear structural part (9) are hollow. A concave portion (8d), which is integrally formed of a resin molded product and in which a control portion (7) in which a control handle (15) is disposed, is provided at a front portion of the step (8). A work vehicle having the hollow portion (A) in a concave portion (8d). 4. The work vehicle according to claim 3, wherein the step (8) and the rear structural portion (9) are formed by blow molding a hollow resin molded product. 5. The method according to claim 1, wherein the hollow portion (A) is provided over substantially the entire area of the concave portion (8d) of the step (8). Working vehicle. 6. The upper and lower layer forming portions (8a), (9)
The work vehicle according to any one of claims 1 to 5, further comprising a superposed portion (B) in which a), (8b), and (9b) are superimposed.