JP3004144B2 - Work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a working vehicle such as a riding lawn mower.

[0002]

2. Description of the Related Art A riding lawn mower is disclosed, for example, in US Pat.
No. 4,627, the first of which
The illustrated vehicle body cover includes an injection molded half 16 and a half 18.
And these seams are 20. Also,
Japanese Utility Model Publication No. Sho 62-12713 proposes an agricultural tractor, and a vehicle body 15 of the tractor is shown in FIG. 3 and includes a hood surrounding cover 9 and a brim-like cover 1 therearound.
9, a step 10, a transmission case cover 11, a rear fender 12, and the like, which are integrally molded with resin.

[0003]

In the case where the above-mentioned body cover is divided into two parts on the left and right, a large bending stress is easily generated at the joint, so that it is necessary to increase the joint strength of the joint. Structure becomes complicated. In addition, in the case where the hood and the rear fender are integrated, the body cover (the body 15) becomes too large, and the cost of the injection mold increases.

[0004]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems, the present invention provides a steering column which is fitted to a rear portion of a hood in a closed state, and is made of resin with a step and left and right rear fenders. The body cover is appropriately sized to facilitate the production of the resin mold. The steering column has a substantially U-shaped planar cross section with an open front surface, and includes a rear wall portion and left and right side walls.
This makes it easier to secure the rigidity of the steering column. And the steering shaft in this substantially U-shape
Of course, the second half of the fuel tank can be stored
You.

[0005] The front end of the side wall of the steering column is covered with the rear end of the closed hood. Open the air intake on the front of the hood or on the rear wall of the steering column. Thereby, there is an advantage that the sealing performance of the hood is improved and the cooling performance inside the hood is further improved.

[0006] At the middle rear portion of the left and right rear fenders, an upper open type concave portion capable of accommodating small articles is integrally formed. This makes it possible to always easily insert small articles from behind.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is a side view of a working vehicle according to the present invention. In the working vehicle 1, a front wheel 3 is attached to a front portion of a body frame 2 extending forward and backward, and a cutter deck 4 is suspended at a lower center portion of the body frame 2. A rear wheel 5 is attached to a rear portion of the vehicle body 2, and a bag support 7 for holding a glass bag 6 is attached to a rear end of the vehicle body frame 2.

FIG. 2 is a side sectional view of the work vehicle according to the present invention. The body frame 2 of the work vehicle 1 has an engine 9 as a prime mover including auxiliary equipment, a steering shaft 10 and a step 11 from front to rear. (See FIG. 1), a seat 12 is disposed, the engine 9 is surrounded by a hood 13 that can be opened and closed, the steering shaft 10 is surrounded by a steering column 15, and at least a part of the gear transmission 16 and the rear wheel 5 is a rear fender 17 (See FIG. 1). Further, a battery 19 is accommodated below the seat 12, and an upper open-type recess 20 suitable for accommodating small articles is arranged behind the seat 12.

When the steering shaft 10 is swung through the handle 21, the front wheel 3 is moved through the link mechanism 22.
Is steered. In the figure, 24 is a fuel tank, 25 is a partition plate, 26 is a muffler, and 27 near the seat 12 is a cutter deck lifting lever. When the cutter deck raising / lowering lever 27 is operated, a parallel link 28 indicated by an imaginary line is displayed.
The height of the cutter deck 4 can be arbitrarily adjusted via the.

The drive system from the engine 9 to the rear wheel 5 and the cutter 29 will be described in detail with reference to the following drawings, but only the arrangement of pulleys and belts will be described in advance. A drive pulley 31 is attached to an output shaft 9 a of the engine 9, a first pulley 33, a second pulley 34, and a third pulley 35 are attached to a relay shaft 32 below the seat 12, and the input shaft 1 of the gear transmission 16 is attached.
6a, the fourth pulley 36 is attached, and the cutters 29, 29
(This will be described in detail with reference to FIG. 3, but the present embodiment uses a twin cutter system.) The fifth cutter shafts 29a, 29a
A pulley 37 and a sixth pulley 38 are attached.
A first belt 39 for driving the relay shaft 32 is driven between the driving pulley 31 and the first pulley 33, and a first belt 39 for driving the gear transmission 16 between the second pulley 34 and the fourth pulley 36. The two belts 40 are stretched, and a third belt 41 for rotating the cutters 29, 29 is stretched between the third pulley 35, the fifth pulley 37, and the sixth pulley 38.

FIG. 3 is a plan sectional view of the working vehicle of the present invention. When the driving pulley 31 rotates, the first pulley 33 is driven, and the second pulley 34 and the third pulley 35 are connected via the relay shaft 32. Driven. The second pulley 34 is connected to the second belt 4
0 drives the fourth pulley 36 through the gear transmission 1
The rear wheels 5, 5 are driven via the rear wheel 6 and the rear axle 42. On the other hand, the third pulley 35 drives the fifth pulley 37 and the sixth pulley 38 via the third belt 41. Thus, the left and right cutters 29, 29 are rotated. In the figure, 44, 45, 4
Reference numerals 6, 47 and 48 denote tensioner pulleys or idler pulleys, which keep the belt tension constant or keep the belt running properly. Further, the tensioner pulley 48 is moved artificially to loosen the third belt 41 and the cutter 2
The driving of 9, 29 is interrupted. Further, the traveling drive is interrupted by loosening the tensioner pulley 45.

FIG. 4 is a plan view of the work vehicle of the present invention.
The cutter deck raising / lowering lever 27 and the traveling shift lever 51 are disposed on both sides of the seat 12, respectively, a throttle lever 52 and a cutter operation switching lever 53 are disposed near the handle 21, and a brake is provided at the front of steps 11 and 11. A pedal 54 and a clutch pedal 55 are arranged.
A duct 56 extends from one end of the cutter deck 4, and the tip of the duct 56 reaches the glass bag 6.

FIG. 5 is a diagram showing a vehicle body cover of the working vehicle according to the present invention. The vehicle body cover 60 is composed of two parts, a front cover 61 corresponding to the bonnet 13 and a rear cover 62 other than the front cover 61. Features. The rear cover 62
The steering column 15, the step 11, the rear fender 17, the battery storage recess 63 (see FIG. 2), the seat mounting surface 64, and the upper open recess (small storage recess) 20 are formed by integral resin molding. Furthermore, the bonnet 13
Swings up and down around the pin 65 and is opened and closed. It is characterized in that the rear end 13a of the closed hood 13 (imaginary line) overlaps the front end 15a of the steering column 15.

FIG. 6 is a sectional view taken along line 6 of FIG. 2. The steering column 15 has a substantially U-shaped plane cross section with an open front surface, and includes a rear wall portion 15b and left and right side walls 15c, 15c.
Consists of Since the steering column 15 has a substantially U-shaped cross section, the strength and rigidity are large. Inside the steering shaft 10 as well as the fuel tank 24
Can be stored. As described above, the front end 15a of the side wall of the steering column 15 is covered with the rear end 13a of the hood 13 in the closed state.

FIG. 7 is an operation diagram of the inside of the hood of the working vehicle according to the present invention, in which the air taken in from the air intake 13b on the front surface of the bonnet 13 is guided by the partition plate 25 and proceeds to the back. This air descends from a through hole 25a formed in the partition plate 25, cools the engine 9 and a carburetor (not shown), further cools the muffler 26, and then lowers the rear of the muffler and the oblique front of both sides of the muffler. Is discharged to

FIG. 8 is a view showing another embodiment of FIG. 7, in which an air intake 15d is formed in the rear wall 15b of the steering column 15, and the inside of the hood 13 is cooled by the air from the air intake 15d. . Since there is no need to provide an air intake in front of the bonnet 13, the bonnet 1
The shape of 3 is simplified.

The engine 9 may be a prime mover such as a diesel engine, a gasoline engine, an electric motor, a hydraulic motor, or the like. Further, the working vehicle 1 of the present embodiment is a riding lawn mower, but is not limited thereto.
As long as a steering column, a step, and a rear fender are arranged in the middle, a working vehicle such as an agricultural tractor, a civil tractor, an agricultural work vehicle, or a civil engineering vehicle may be used.

[0018]

As described above, according to the present invention, the vehicle body cover is divided into a front cover corresponding to a hood and a rear cover other than the front cover, and the steering column, the step, and the left and right rear fenders are integrated into the rear cover. Since the resin is used, the number of parts is reduced, the body cover becomes an appropriate size, and the molding becomes easy. Therefore, the weight of the body cover is reduced, and the injection molding die is preferably inexpensive. Further, by dividing into two parts, only the hood is opened and closed when inspecting the engine and the like, that is, since it is not necessary to remove the rear cover, maintenance and repair become easy. In addition, since the cover is integrated, screws for attaching the cover and the like are abolished, and the joining portion is eliminated, so that the effect of preventing intrusion of rainwater, dust and the like is exhibited, and the sealing performance is improved.

Since the steering column has a substantially U-shaped flat cross section with an open front surface, the strength and rigidity of the steering column are increased, and the rear half of the fuel tank is provided inside.
The parts can be arranged, and the strength and rigidity can be improved and the storage space can be secured.

Since the front end of the side wall of the steering column is covered with the rear end of the closed hood,
The airtightness of the connecting portion between the front cover and the rear cover is improved, and engine sound and the like are prevented from leaking to the outside.

Since the engine room is constructed by closing the rear opening of the hood with the steering column, the inside of the engine room can be cooled by air taken in from the air intake opening in the front of the hood or the rear wall of the steering column.

When the upper open-type recess is integrally formed in the middle rear portion of the left and right rear fenders, small items can be easily accommodated, which is convenient.

[Brief description of the drawings]

FIG. 1 is a side view of a work vehicle according to the present invention.

FIG. 2 is a side sectional view of the work vehicle according to the present invention.

FIG. 3 is a cross-sectional plan view of the work vehicle according to the present invention.

FIG. 4 is a plan view of the work vehicle of the present invention.

FIG. 5 is a body cover diagram of the work vehicle according to the present invention.

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

FIG. 7 is an operation diagram of cooling inside the hood of the work vehicle according to the present invention.

FIG. 8 is a view showing another embodiment of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Work vehicle, 2 ... body frame, 3 ... front wheel, 4 ... cutter deck, 5 ... rear wheel, 9 ... motor (engine), 10
... Steering shaft, 11 ... Step, 12 ... Seat, 13 ... Bonnet, 13a ... Bonnet rear end,
13b: hood air inlet, 15: steering column, 15a: front end of steering column, 15
b: rear wall of steering column, 15c: side wall of steering column, 15d: air intake of steering column, 16: gear transmission (drive unit), 1
7 ... rear fender, 20 ... upper open type recess (small article storage recess), 24 ... fuel tank, 60 ... body cover, 61 ... front cover, 62 ... rear cover.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-107463 (JP, A) JP-A-61-115720 (JP, A) Fully open 1986-105227 (JP, U) Really open Showa 59- 23418 (JP, U) Shokai 56-5639 (JP, U) Shokai 57-130723 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 25/24 B62D 25 / 10-25/12 B62D 29/04 B60K 11/04

Claims (4)

(57) [Claims] 1. A prime mover including a front wheel attached to a front portion of a body frame that extends forward and backward, a drive unit such as a rear wheel and a gear transmission attached to a rear portion of the body frame, and an auxiliary device mounted on the body frame from front to rear. , A steering shaft, left and right steps, and a seat were arranged, the auxiliary devices and the prime mover were enclosed by a hood that can be freely opened and closed, the steering shaft was enclosed by a steering column, and at least a part of the drive unit and rear wheels were enclosed by a rear fender. In the work vehicle, the steering column is formed by a rear wall portion and left and right side walls.
Presents a substantially U-shaped cross section with an open front
In addition, the steering shaft as well as this approximately U-shape
The latter half of the fuel tank is stored and
And are made of resin with the left and right rear fenders.
With the front end of the steering column side wall closed.
Lay on the bonnet as if covered by the rear end of the net
Work vehicle was characterized by Wasaru. 2. A work vehicle according to claim 1 which is characterized in that it has an air intake on the front of the bonnet. 3. A work vehicle according to claim 1, characterized in that it comprises an air intake to the wall portion after the steering column. 4. An intermediate rear portion of the left and right rear fenders,
The work vehicle according to claim 1, wherein an upper open-type concave portion capable of storing small articles is integrally formed.