JP2531465Y2 - Control unit for snowmobile control unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a control unit protection device for a snowmobile that protects a control unit disposed in an engine room from snow, rainwater, and the like flowing together with cooling air.

[Problems to be Solved by Conventional Techniques and Inventions] Recently, like general automobiles, there has been a trend toward electronic control in snowmobiles. For example, in the case of air-fuel ratio control, the fuel injection amount is reduced by the throttle opening α. And engine speed N
In the so-called α-N control, the fuel injection amount is set based on the throttle opening α and the engine speed N, and a means for calculating the fuel injection pulse width for the injector is employed.

The control unit that calculates the fuel injection pulse width needs to be provided in a place that is not easily affected by rainwater, vibration, and the like. In addition, since this control unit calculates the fuel injection pulse width and the like based on the output signals of the sensors attached to the engine, it is desirable to install the control unit in a place relatively close to the engine, that is, in an engine room.

This engine room is covered with a front hood, for example, as disclosed in Japanese Patent Publication No. 63-45359, and an air intake formed in the front hood actively sends cooling air to the engine room. By adopting this, the heat-generating parts such as mufflers and exhaust manifolds are cooled to prevent the generation of vapor in the fuel piping due to radiant heat.

Therefore, depending on the running conditions of the snowmobile, snow, rainwater, and the like enter the engine room together with the cooling air from the air intake, and easily adhere to the waterproof case constituting the control unit.

In general, the joint between the lid and the main body of the waterproof case is sealed with packing or the like.For example, when the waterproof case is repeatedly heated and cooled by the influence of radiant heat immediately after the engine is stopped, the joint, So-called breathing may occur, and water droplets attached to the outside of the waterproof case may enter the inside. As a result, water droplets adhere to the control board on which the CPU and the like are housed in the waterproof case, which causes malfunction.

As a countermeasure, conventionally, the waterproof case is further surrounded by a separate cover to make it less susceptible to radiant heat, or by changing the layout of the air intake,
Although the snow and rainwater are prevented from directly adhering to the waterproof case, if a separate cover is used, the cover must be detached one by one during maintenance and inspection, which complicates the operation. Also, changing the layout of the air intake is not preferable because the cooling efficiency of the engine room is reduced.

[Purpose of the Invention] The present invention has been made in view of the above circumstances, facilitates maintenance and inspection without changing the layout of the air intake, and effectively protects the control unit from snow, rainwater, vibration, and the like. It is an object of the present invention to provide a snowmobile control unit protection device that can perform the control.

[Means and Actions for Solving the Problems] To achieve the above object, a snowmobile control unit protection device according to the present invention includes an engine disposed immediately downstream of an air intake formed in a hood covering an engine room, Further, an air box communicating with an intake system of the engine is provided on a side of the engine room opposite to the air intake port with the engine interposed therebetween, and the upper surface of the air box and the hood covering the upper side of the air box are provided. And a deflector hanging down from the hood is interposed between the front surface of the control unit and an upper part of the engine opposed to the front surface of the control unit.

That is, when the snowmobile travels, cooling air is taken into the engine room from the air intake formed in the hood that covers the engine room, cools the heat-generating portion such as the engine, and passes backward. At this time, the cooling air that has passed through the upper part of the engine collides with a deflector suspended from the hood to change the flow path, and is disposed behind the deflector and communicates with the air intake system of the engine. Bypassing the control unit disposed between the box and the hood covering above the air box, the control unit is protected from snow, rainwater, and the like flowing in with the cooling air from the air intake through the control unit. You.

[Embodiments of the present invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a front part of a snowmobile, and FIG. 2 is a horizontal sectional view of a front part of a snowmobile.

(Structure) Reference numeral 1 in the figure denotes a front hood, which is a raw hood that is fixedly mounted on a body frame (not shown)
1a and an upper hood 1b which is openably joined to the raw hood 1a. A suspension arm 3 supported by the stay 2 extends downward from both sides of the bottom of the raw hood 1a, and a ski 4 is connected to the suspension arm 3.

On the other hand, an engine room 5 is formed in the hood 1, and an air intake (louver) 1c for taking outside air into the engine room 5 is formed in a front portion of the upper hood 1b.

Further, an engine 7 provided in the engine room 5 is provided immediately downstream of the air intake port 1c. Further, a continuously variable drive pulley is provided on the output shaft of the engine 7.
A continuously variable drive pulley 7a and a crawler (not shown) at the rear of the machine are connected via a belt 7b and a continuously variable driven driven pulley (not shown).
Further, an exhaust manifold 8 connected to the exhaust port of the engine 7 extends to the air intake 1c side,
An exhaust pipe 9 connected to the distal end of the exhaust pipe 9 extends rearward, bypassing the lower side of the air intake port 1c, and is opened to the atmosphere via a muffler (not shown).

Further, a throttle body 10 is connected to an intake port of each cylinder of the engine 7 through a vibration-proof member 10a such as rubber. Further, an expansion chamber 11 of an air box 11 provided behind the engine 7
a is connected via another vibration isolating member 10b such as rubber. An intake system is constituted by the intake port of the engine 7, the throttle body 10, and the like.

Further, an intake air chamber 11c partitioned from the expansion chamber 11a by an air cleaner element 11b is formed at an upper portion of the air box 11, and the intake air chamber 11c is open to the rear of the front hood 1.
Communicated with 11d.

Further, a waterproof case 12a of a control unit (ECU) 12 is fixed on the upper surface of the air box 11 via a bracket 13, and a deflector 16 having a larger area than the front surface is provided on the front surface of the waterproof case 12. The upper part of the deflector 16 is fixed to the inner wall surface of the upper hood 1b.

As a result, the control unit 12 controls the air intake 1c.
Seen from the side, the deflector 16 and the upper hood 1
b, It is in a state surrounded by the air box 11.

Note that a control board (not shown) for mounting a CPU and the like is housed in the waterproof case 12a. The above control unit
In 12, a throttle opening (α) signal output from a throttle opening sensor 14 connected to a throttle valve (not shown) provided on the throttle body 10 and a CDI
Various calculations are performed by detecting the pulse output interval, and the injection pulse width and the like for the injector 15 are set.

(Operation) Next, the operation of the embodiment having the above configuration will be described.

When the engine 7 is operated and a crawler (not shown) at the rear of the fuselage is driven via a continuously variable pulley 7a and a belt 7b connected to the engine 7, the snowmobile runs, and the upper Cooling air is taken into the engine room 5 from an air intake 1c formed on the front surface of the hood 1b, and heat generating parts such as the exhaust manifold 8, the exhaust pipe 9, the muffler (not shown), and the engine 7 are cooled.

On the other hand, the wind that has cooled the engine 7 passes through the side surface or the upper surface of the engine 7 and passes backward. The cooling air passing through the upper portion of the engine 7 is supplied to the upper hood
Collision with the deflector 16 erected from 1b causes its distribution route to be deflected. The control unit 12 fixed behind the deflector 16 is surrounded by the deflector 16, the upper hood 1b, and the air box 11, so that the waterproof case 12a of the control unit 12 Inflowing snow and rainwater do not directly adhere.

As a result, even if so-called breathing occurs at the joint of the waterproof case 12a under the influence of the radiant heat immediately after the engine is stopped, since water droplets do not adhere to the waterproof case 12a, water droplets enter the inside. It is difficult to protect the internal control board from water droplets.

Further, since the deflector 16 is fixed to the upper hood 1b, if the upper hood 1b is opened at the time of maintenance and inspection, the deflector 16 is additionally removed, and workability is improved.

(Second Embodiment) FIG. 3 is a horizontal sectional view of a front portion of a snowmobile according to a second embodiment of the present invention.

In this embodiment, the upper hood 1a of the front hood 1
(See Fig. 1)
As shown in the figure, it is formed by bending backward from the center portion, passes through the upper part of the engine 7, and
The cooling air colliding with the front of the deflector 16 can be released in a layered manner to the left and right along the surface of the deflector 16, smoothing the flow of the cooling air, and further adhering snow and rainwater to the waterproof case 12a of the control unit 12. It can be effectively prevented.

Further, since the air box 11 is connected to the throttle body 10 via the vibration isolating member 10b and the throttle body 10 is connected to the intake port of the engine 7 via another vibration isolating member 10a. The air box 11 is hardly directly affected by the vibration of the engine 7, and therefore the control unit mounted and fixed to the air box 11
12 Vibration resistance is improved.

[Effects of the Invention] As described above, according to the present invention, an engine is disposed immediately downstream of an air intake formed in a hood covering an engine room, and the air intake of the engine room and the engine are disposed. An air box communicating with the intake system of the engine is disposed on the side opposite to the air box, and a control unit is disposed between the upper surface of the air box and a hood covering the upper part of the air box. By interposing a deflector between the unit and the upper part of the engine opposite to the front of the control unit, the control unit is surrounded by a deflector, a hood, and an air box, and the layout of the air intake is changed as in the past. Without flowing, the snow flowing into the control unit with the cooling air,
It can be effectively protected from rainwater.

Further, since the deflector is interposed, it is not necessary to cover the control unit with a separate cover or the like, and maintenance and inspection are facilitated.

Further, since the deflector is vertically suspended from the hood, when the hood is opened at the time of maintenance and inspection, the deflector is removed together with the hood, thereby improving workability.

[Brief description of the drawings]

1 and 2 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a front portion of a snowmobile, FIG. 2 is a horizontal sectional view of a front portion of a snowmobile, and FIG. FIG. 4 is a horizontal sectional view of a front portion of a snowmobile according to a second embodiment of the present invention. 1 ... hood, 1c ... air intake, 5 ... engine room, 7 ... engine, 10 ... intake system, 11 ... air box, 12 ... control unit, 16 ... deflector.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Fumio Tachibana 1-7-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Shimizu Tomi Heavy Industries Co., Ltd. (72) Kazuo Suzuki 1-7-1-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Tomi Shigeki Kogyo Co., Ltd. (72) Inventor Yoshiki Tsubame 1671-1, Kasukawa-cho, Isesaki-shi, Gunma Japan Electronic Equipment Co., Ltd. (56) References JP-A-63-203495 (JP, A) JP-A-57- 18451 (JP, A) Actually open 1979-98229 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] An engine is disposed immediately downstream of an air intake formed in a hood covering an engine room, and an intake system of the engine is provided on a side of the engine room opposite to the air intake with the engine interposed therebetween. An air box communicating with the air box; a control unit disposed between the upper surface of the air box and the hood covering above the air box; and a front surface of the control unit and a front surface of the control unit. A control unit protection device for a snowmobile, wherein a deflector hanging from the hood is interposed between the engine and an upper part of the engine.