Harvesters – Motorized harvester – Having motor on ground-supported carrier
Reexamination Certificate
2001-05-25
2004-02-03
Kovács, Árpád F (Department: 3671)
Harvesters
Motorized harvester
Having motor on ground-supported carrier
C180S068100, C180S068300
Reexamination Certificate
active
06684616
ABSTRACT:
BACKGROUND OF THE INVENTION
I. Field of the Invention
This invention relates to the field of lawn mowers, in more particularly to the air induction system of the mower hood of a riding lawn mower.
II. Description of the Related Art
It is well known in the art to provide ventilation in the hood of a riding lawn mower in order to cool the engine. Also, the air pulled in through the hood is used in mixing oxygen with the gasoline to create combustible conditions to provide power in the engine. However, most of the prior art mowers have the ventilation slits in the top of the mower hood. This allows rain and other debris to enter the mower engine, causing problems of rust and dampness.
One type of riding lawn mower is disclosed in U.S. Pat. No. 4,969,533 to Holm et al. Holm discloses a tractor including a dual screen filtering arrangement located upstream of a radiator and an engine combustion air inlet. Although the Holm patent discloses the use of air inlets on the side of the mower hood, it does not disclose the creation of air induction cavities solely by connecting an upper hood and a lower hood. The present invention also does away with the need for screens to prevent debris from entering the engine.
One type of riding lawn mower is disclosed in U.S. Pat. No. 5,782,312 to Murakawa. Murakawa discloses slits formed in a front surface of a panel body on the left and right sides for drawing in engine cooling air. These slits are provided particularly to guide the cooling air forwardly and downwardly. In the current invention however the slit for drawing in the air is aligned along the side of the mower hood, as opposed to the panel body near the steering wheel as in Murakawa. The length of the air induction cavity in the current invention also allows a good volume of air to be drawn into the engine. The Murakawa patent also does not disclose any method for separating the hot and cold air underneath the hood, and does not have the inventive blower housing as described in the current invention. The current invention therefore provides advantages over the cooling capabilities of the Murakawa invention.
Another riding mower is disclosed in U.S. Pat. No. 5,113,819 to Murakawa et al. Murakawa discloses air guide covers that, together with the surface of the engine body, define a cooling air passage that allows the oil cooler to be supplied with cooling air that has not been heated by the engine. However, this separation of the hot and cold air takes place within the engine, as opposed to underneath the hood, and separate from the engine as in the current invention. The current invention also draws the air into the engine through air induction cavities that are located lower than the air intake, thereby preventing debris from entering the engine.
Another riding lawn mower is described in U.S. Pat. No. 5,207,187 to Kurohara et al. Kurohara discloses two shield members connected to opposite ends of each other and extending downwardly between the side walls of the engine and the side surface of the hood respectively. This shield allows the cooling air to be introduced from the rear of the engine and to flow along opposite sides of the engine to reach an air suction opening above the engine. However, these shield members do not separate the hot and the cold air from going into the engine, and also the air drawn in, in Kurohara, comes from the back of the mower hood or the front of the panel body underneath the steering column.
The present invention contemplates a new and improved air induction system, which is simple in design, effective in use, and overcomes the foregoing difficulties and others while providing better and more advantageous overall results.
SUMMARY OF THE INVENTION
In accordance with the present invention, a new and improved air induction system is provided which has an engine, a base, a hood for enclosing the engine, the hood comprising an upper hood, a lower hood, a first air induction cavity on a first side of the hood, a second air induction cavity on a second side of the hood, the air induction cavities having a first diameter and a second diameter, wherein the first diameter is substantially larger than the second diameter, a headlight, bellows for adjustably attaching the blower housing to the engine, and a blower housing, the blower housing comprising a first shield member, a second shield member, an air intake, a first lip and a second lip, the lips being angled toward the blower housing, the lips having an angle A
1
, the angle A
1
being approximately between 60° and 80°, a first channel, and a second channel, the induction cavities being formed by the connection of the upper hood to the blower housing.
In accordance with another aspect of the present invention, the air induction system has an upper hood, a lower hood, a blower housing, an air induction cavity, the air induction cavity being formed by the connection of the upper hood to the blower housing, and an air intake.
In accordance with yet another aspect of the present invention, the air induction system includes the upper hood having a top that is a continuous piece, the air induction cavity being located on a side of the upper hood, the housing assembly having at least two air induction cavities, upper and lower lips, the upper and lower lips forming the air induction cavity, and an air intake.
In accordance with still another aspect of the present invention, the air induction system includes the air intake having a height, the lower lip having a height, the height of the air intake being greater than the height of the lower lip, the air induction cavity having a first diameter and a second diameter, the first diameter being greater than the second diameter, a first shield member, a second shield member, the shield members separating the air from an engine from the ambient air, an air intake, and the blower housing fitting inside the upper hood.
In accordance with yet another aspect of the present invention, the air induction cavities have a width and a height, the width being greater than the height.
In accordance with another aspect of the present invention, a method of air induction includes the steps of providing an upper hood, providing an air intake, providing a blower housing, connecting the upper hood to the blower housing, thereby creating an air induction cavity, drawing air into the blower housing through the air induction cavity into the air intake and preventing hot air from the associated engine from mixing with the air being drawn into the air intake, the mixing being prevented by first and second shield members.
In accordance with still another aspect of the present invention, the method includes the steps of providing an upper hood with an upper lip, providing a blower housing with a lower lip, the lower lip having a height and the air intake having a height, the height of the air intake being greater than the height of the lower lip, providing an air induction cavity having a first diameter and a second diameter, the first diameter being greater than the second diameter.
One advantage of the current invention is that rainwater is prevented from entering the engine because the air is drawn in from the side of the mower hood.
Another advantage of the current invention is that the hot air is prevented from going into the air intake, and only ambient air is used.
Still another advantage of the current invention is that the air induction cavity is formed by the connection of the upper hood and the blower housing.
Yet another advantage of the current invention is that the ambient air is drawn in from the sides of the hood, thereby preventing debris from entering the engine.
Still other benefits and advantages of the invention will become apparent to those skilled in the art upon a reading and understanding of the following detailed specification.
REFERENCES:
patent: 3896872 (1975-07-01), Pabst et al.
patent: 3982600 (1976-09-01), Gerresheim et al.
patent: 3987766 (1976-10-01), Welck
patent: 4231344 (1980-11-01), Urbinati et al.
patent: 4354458 (1982-10-01), Bury
patent: 4606422 (1986-08-
Bennett Timothy D.
Emerson Roger D.
Kovács Árpád F
McDowell Brouse
MTD Products Inc.
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