JPH1122464A - Cooling air exhaust structure of mower - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent wiping of turf caused by cooling exhaust air after muffler cooling from an exhaust port. After exhausting cooling exhaust air from a radiator (6) around a muffler (24) disposed in front of and below an engine (5), an exhaust port (25A) formed at the front of a muffler cover (25).
In the cooling wind exhaust structure of the mowing machine configured to discharge the muffler to the outside of the muffler, the muffler cover 25 is substantially horizontally extended from the inclined guide surface 25B substantially along the rear portion of the muffler 24 to the exhaust port 25A. And a straight guide surface 25C, and the length of the straight guide surface 25C is set such that its front end is located forward of the front end of the muffler 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system, in which cooling exhaust air from a radiator is guided around a muffler disposed below and in front of an engine, and then discharged outside the machine from an exhaust port formed at a front portion of a muffler cover. The present invention relates to a cooling air exhaust structure for a mowing machine configured as described above.

[0002]

2. Description of the Related Art Conventionally, in a cooling air exhaust structure for a mower as described above, for example, as disclosed in Japanese Patent Application Laid-Open Nos. 9-72216 and 9-72217, the front lower part of a muffler is disclosed. An exhaust port is formed in the vicinity, and a muffler cover is formed so as to have a guide surface for guiding cooling exhaust air from the rear of the muffler to the exhaust port. From the exhaust port toward the lower front.

[0003]

That is, according to the above-mentioned prior art, a state in which the cooling exhaust air, which has become considerably high due to the cooling of the muffler, is discharged by blowing it toward the turf in front of the fuselage. Therefore, there is a possibility that the turf will fall and die due to high-temperature cooling exhaust air from the exhaust port after muffler cooling.

[0004] It is an object of the present invention to prevent grass dying caused by cooling exhaust air after muffler cooling from an exhaust port.

[0005]

In order to achieve the above object, according to the present invention, cooling exhaust air from a radiator is guided around a muffler disposed below and in front of an engine, and then formed at a front portion of a muffler cover. In the cooling wind exhaust structure of the mower configured to discharge the exhaust air from the exhaust port to the outside, the muffler cover is provided with an inclined guide surface substantially along a rear portion of the muffler, and from the inclined guide surface to the exhaust port. The muffler was formed so as to have a substantially horizontal linear guide surface, and the length of the linear guide surface was set to a length such that its front end was located forward of the front end of the muffler.

According to the present invention, cooling exhaust air can be smoothly guided to the periphery of the muffler by the inclined guide surface of the muffler cover substantially along the rear portion of the muffler, and the muffler can be effectively cooled. The muffler can be heated to a high temperature by cooling the muffler with the linear guide surface of the muffler cover, which is substantially horizontal from the inclined guide surface to the exhaust port, and whose front end is set to a length located forward of the front end of the muffler. The exhausted cooling air can be exhausted from the exhaust port toward the front of the fuselage with sufficient horizontal directivity. In other words, it is possible to prevent the cooling exhaust air, which has become considerably high in temperature by cooling the muffler, from being blown onto the grass in front of the fuselage.

[Effect] Therefore, while the muffler is effectively cooled by the cooling exhaust air by the function of the inclined guide surface in the muffler cover, the cooling exhaust air after the muffler is cooled from the exhaust port by the function of the linear guide surface. Grass can be prevented from dying.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire side surface of a lawn mower. In this lawn mower, a mower 3 is connected to an intermediate position in the front-rear direction of a traveling body 1 via a four-parallel-type lifting link mechanism 2 so as to be movable up and down. By doing so, it is configured as a mid-mount type. The traveling body 1 includes a body frame 4 including a pair of left and right main frames 4A and the like, a longitudinal axis type water-cooled engine 5 mounted on a front portion of the body frame 4, and a radiator 6 arranged above the engine 5 in a horizontal posture. An axle frame 7 supported at the front of the body frame 4; a hydrostatic continuously variable transmission 8 and an axle case 9 supported at the rear of the body frame 4;
A front steering wheel 10 mounted on each of the left and right ends of the axle frame 7, a driving rear wheel 11 mounted on each of the left and right ends of the axle case 9, a steering wheel 12 linked to the front wheel 10, and a body frame 4. It is configured as a riding type by a driver's seat 13 arranged above the rear of the vehicle.

As shown in FIGS. 1 to 3, a front frame 4B extending forward from a main frame 4A and a lower bonnet 14 standing upright on the front frame 4B are provided at the front of the traveling body 1. An upper bonnet 15, which is connected to the lower bonnet 14 so as to be capable of opening and closing around a horizontal axis P,
An engine room 18 is formed by a control panel 16 erected on the main frame 4A so as to be connected to the upper and lower bonnets 14 and 15, and a mounting table 17 arranged from the front frame 4B to the control panel 16. Is formed. The engine room 18 is divided by a partition wall 19 into a first chamber 18A on the front side and a second chamber 18B on the rear side, and the engine 5 and the radiator 6 are arranged in the first chamber 18A. ing. An intake port 16 </ b> A is formed on the rear surface and on both left and right sides of the control panel 16 to take in cooling outside air with the rotation of the cooling fan 20 provided between the engine 5 and the radiator 6. Cooling fan 20
Is a fan case 21 connected to the bottom of the radiator 6.
The rotation of the fan case 21 allows cooling outside air taken into the second chamber 18B of the engine room 18 from the intake port 16A through the radiator 6 through the opening 19A formed in the partition wall 19 by the rotation. Outlet 21A formed in the front of the fan case 21
Exhaust ports 14A, 15A formed on the front surfaces of the lower bonnet 14 and the upper bonnet 15.
From outside the machine. Fan case 2
A pair of left and right ducts 22 are provided in series at the one outlet 21A to guide a part of the cooling exhaust air discharged from the outlet 21A toward the front and lower part of the engine 5. At the lower front of the engine 5, a pair of left and right exhaust pipes 2
A muffler 24 connected to the engine 5 via 3 is provided, and a muffler cover 25 surrounding the muffler 24 is provided. The left and right ducts 22 are connected to the muffler cover 25. I have. In other words, a part of the cooling air discharged from the outlet 21A of the fan case 21 is guided around the muffler 24 to cool the muffler 24. Note that the cooling exhaust air after cooling the muffler 24 is discharged outside the machine from an exhaust port 25 </ b> A formed in a lower front part of the muffler cover 25.

The muffler cover 25 is formed to have a curved inclined guide surface 25B extending substantially along the rear portion of the muffler 24, and a substantially horizontal straight guide surface 25C extending from the inclined guide surface 25B to the exhaust port 25A. Have been. The length of the linear guide surface 25C is set to a length such that its front end is located forward of the front end of the muffler 24. From this configuration,
By the inclined guide surface 25B of the muffler cover 25, the cooling exhaust air guided by the left and right ducts 22 can be smoothly guided to the periphery of the muffler 24, so that the muffler 24 can be cooled effectively and the muffler cover can be effectively cooled. 25
The cooling exhaust air, which has been heated by cooling the muffler 24, can be discharged from the exhaust port 25A toward the front of the fuselage with sufficient horizontal directivity provided by the linear guide surface 25C. In this way, it is possible to prevent the cooling exhaust air, which has become considerably high in temperature by cooling the muffler 24, from being blown to the turf in front of the fuselage. That is, while the muffler 24 is effectively cooled by the cooling exhaust air by the function of the inclined guide surface 25B of the muffler cover 25, the function of the linear guide surface 25C is
The turf can be prevented from falling off due to cooling exhaust air after muffler cooling discharged from the exhaust port 25A.

By the way, the outlet 21 of the fan case 21
The left and right ducts 22 for guiding a part of the cooling exhaust air discharged from A toward the muffler 24 are square pipe-shaped ones in which the amount of air flowing in the duct is increased by increasing the duct width. Has been adopted. That is, by increasing the amount of air flowing in the duct, the muffler 24
Can be more effectively cooled, and the temperature rise of the cooling exhaust air at the time of muffler cooling can be suppressed. From this point as well, the muffler 24 can be effectively cooled by the cooling exhaust air. Also, it is possible to prevent the grass from falling off due to the cooling exhaust air after the muffler cooling discharged from the exhaust port 25A. The left and right ducts 22 are
The opening on the side of the muffler 24 faces the connection between the exhaust pipe 23 from the engine 5 and the muffler 24,
Thus, the cooling exhaust air can be intensively blown near the connection with the exhaust pipe 23, which is the hottest point in the muffler 24, and the muffler 24 can be cooled efficiently.

As shown in FIG. 2, a steering operation system extending from the left and right front wheels 10 to the steering wheel 12 has a torque sensor 27A for detecting an operation torque acting on a steering shaft 26 in accordance with the turning operation of the steering wheel 12. And an electric power steering device 27 comprising an electric motor 27C for assistingly turning the steering shaft 26 via a bevel gear mechanism 27B with a steering assist force corresponding to the operation torque detected by the torque sensor 27A. Is provided, so that the turning operation force of the steering wheel 12 required during the steering operation can be reduced.

By the way, in the steering operation system without the electric power steering device 27 as described above, the steering shaft 26 is
To remove the steering wheel 2, the nut 28 for fixing the steering wheel 12 to the steering shaft 26 is loosened, and the upper portion of the steering shaft 26 is hit with a hammer or the like to loosen the fitting between the steering shaft 26 and the steering wheel 12. However, in the steering operation system having the electric power steering device 27, when the steering wheel 12 is removed, the upper part of the steering shaft 26 can be hit with a hammer or the like, and the torque sensor 27A of the power steering device 27 can be used. Causes a failure. Therefore, the steering shaft 2
It is considered that a gear puller 29 is used instead of hitting the upper part of the steering wheel 1.
Only a gap of about 3 to 4 mm is formed between the gear puller 2 and the control panel 16, whereby the gear puller 29
Cannot be locked to the steering wheel 12 so that the gear puller 29 cannot remove the steering wheel 12 from the steering shaft 26. Therefore, FIGS. 4 and 5
As shown in FIG. 2, a circular handle puller 30 made of a plate material having a plate thickness of about 3 mm, which can be engaged in a gap between the steering wheel 12 and the control panel 16 is provided. The handle puller 30 has two notches 30a into which the steering shaft 26 is engaged, locking members 30b which lock the claw portions 29A of the gear puller 29, and a connecting member 30c for bolt connection. 30A.

That is, as shown in FIG. 4, when removing the steering wheel 12 from the steering shaft 26, the nut 28 for fixing the steering wheel 12 to the steering shaft 26 is loosened, and then the steering shaft 26 is inserted into the notch 30a. Each semicircle 30 is placed in the gap between the steering wheel 12 and the control panel 16 so as to be engaged.
A is engaged with the steering wheel 12 and the steering panel 16 by fastening the semi-circular bodies 30A by bolts. Each claw portion 29A of the gear puller 29 is locked to the stopper 30b, and in this state, a pull-out bolt 29C screwed to a nut portion 29B of the gear puller 29 is screwed and pressed against the upper end of the steering shaft 26, thereby using a hammer or the like. The steering wheel 12 can be easily removed from the steering shaft 26 without causing a failure such as the torque sensor 27A of the power steering device 27 caused by hitting the upper portion of the steering shaft 26.

[Other Embodiments] Hereinafter, other embodiments of the present invention will be listed. As the inclined guide surface 25B of the muffler cover 25,
It may be formed in a straight line substantially along the rear part of the muffler 24. As the straight guide surface 25C of the muffler cover 25,
It may be formed horizontally from the inclined guide surface 25B to the exhaust port 25A, or may be formed to be inclined upward or downward in a state nearly horizontal from the inclined guide surface 25B to the exhaust port 25A. It may be.

[Brief description of the drawings]

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

FIG. 2 is a front longitudinal sectional side view of a lawn mower showing a shape of a muffler cover.

FIG. 3 is a longitudinal sectional front view of a lawn mower showing a muffler cooling structure.

FIG. 4 is a side view of the steering wheel showing a use state of the handle puller and the gear puller.

FIG. 5 is an exploded perspective view showing a configuration of a handle puller.

[Explanation of symbols]

 5 Engine 6 Radiator 24 Muffler 25 Muffler cover 25A Exhaust port 25B Inclined guide surface 25C Straight guide surface

Continued on the front page (72) Inventor Seiya Harada 64 Ishizu-Kitacho, Sakai City, Osaka, Japan Inside Kubota Sakai Factory (72) Inventor Seigo Murakawa 64, Ishizu-Kitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory

Claims (1)

[Claims] 1. A mowing machine configured to guide cooling exhaust air from a radiator around a muffler disposed in front of and below an engine, and then discharge the exhaust air to the outside through an exhaust port formed at a front portion of a muffler cover. A cooling air exhaust structure, wherein the muffler cover is formed to have an inclined guide surface substantially along a rear portion of the muffler, and a substantially horizontal linear guide surface extending from the inclined guide surface to the exhaust port. With
A cooling air exhaust structure for a mowing machine, wherein a length of the linear guide surface is set to a length whose front end is located forward of a front end of the muffler.