JPS5959521A - Engine room temperature control device for vehicle - Google Patents

Abstract

PURPOSE:To eliminate malfunction of a fuel system in an engine room, by opening a lid through a link mechanism by a force of a shape memory alloy when engine room temperature rises higher than a fixed value, thereby to allow cool air to be induced into the engine room. CONSTITUTION:In a vehicle such as a snowmobile having a fixed cover 8 covering an engine, there is provided a lid opening and closing device 12 for opening and closing a lid 11 in response to temperature in an engine room 9 thereby to maintain the temperature in the engine room 9 at a value less than a fixed temperature. The lid opening an closing device 12 is provided with a coiled shape memory alloy 18 acting to expand when the temperature in the engine room 9 becomes higher than a fixed value. A piston 19 is pushed when such expansion of the alloy 18 exceeds a tensile force of a return spring 21. A link lever 26 is clockwise rotated through a pin 22 and a link rod 25 by such slide of the piston 19, thereby outwardly opening the lid 11 about a pin 34 so as to open a cool air intake opening 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the temperature in the engine room of a vehicle such as a snowmobile, which has an engine room with a fixed cover surrounding the engine.

In snowmobiles and the like, the engine is covered with a fixed cover, so the temperature inside the engine room tends to rise. Therefore, various problems are likely to occur in the engine's fuel system, such as percolation in the carburetor that supplies fuel to the engine.

It is an object of the present invention to provide a fuel system which has a simple structure and which can effectively adjust the temperature within the engine room to eliminate the above-mentioned malfunctions in the fuel system.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view of a snowmobile to which an embodiment of the present invention is applied, and FIG. 2 is a plan view thereof.

The snowmobile (1) is equipped with an engine (3) at the front of the vehicle body (2), a control seat (4) at the rear, and an engine (3) mounted at the front of the vehicle body (2).
3), the vehicle travels by driving a crawler (5) provided at the lower rear of the vehicle body (2). The snowmobile (]) also has a handle (6) that can be used to operate a pair of skis (7) attached to the front lower side of the vehicle body (2). In the snowmobile (1) having such a structure, the engine (3) is surrounded by a fixed cover (8) to form an engine room (9).

A cooling air intake port θQ that takes in cooling air from outside the vehicle body (2) is provided in the upper part of the fixed cover (8). A lid 0υ that guides cooling air to the engine (3) disposed in the engine room (9) is attached to the cooling air intake 00 so as to be openable and closable in the traveling direction of the snowmobile. When the lid 0υ is open, the inner surface of the lid 0υ guides the running air generated by the running of the snowmobile (1) to the engine (3) as cooling air. On the other hand, a lid opening/closing device 02 is provided in the engine room (9). The lid opening/closing device 0 opens and closes the lid θυ in response to the temperature in the engine room (9), thereby adjusting the temperature so that the temperature in the engine room (9) does not exceed a certain level.

Next, referring to Fig. 3 and Fig. 4, fit the lid opening/closing device.
The structure of Qa will be explained. The lid opening/closing device α has a cylinder shape and is fixed to the inside of the fixed cover (8) via a bracket. The lid opening/closing device 0-pier includes an inner tube (14) and an outer tube θ which are arranged concentrically with each other.

One end of each of the two channels is connected by a cap θQ. In this connected state, the other end of the inner tube 04) protrudes outward from the outer tube OQ. Both tubes α4)
A shape memory alloy (T) made of Cu-Zn or Ni-Ti1 that expands and contracts in response to the internal temperature of the engine room (9) and a cylindrical screw I/N01 are inserted into the space αQ between 130 and 130. . This shape memory alloy α barrel is coiled to obtain strong force when it is expanded. In this way, at the other end of the shape memory alloy (formerly disposed between the cap θQ and the piston OO, the inner tube 04).

A cylindrical piston (a) with a bottom is inserted and attached from the bottom of the inner tube 04) so that it can slide inside the inner tube 04). A return spring Qυ is provided between the piston rod and the cap Oe and inside the inner tube 04) to constantly pull the piston (4) toward the cap uQ. The tensile force of this return spring η is smaller than the elongation force of shape memory alloy 081 when the temperature inside the engine room (9) exceeds a predetermined value, but the elongation force of shape memory alloy 081 at other times. larger than

Next, attach pins (2) to both screws 1 to 0 (1), respectively.
) A counter is installed. The pin (A) protrudes outward from the outer tube OQ through a long groove (■■) formed in the peripheral wall of the outer tube 0υ in the axial direction thereof. Both pistons H (1)
is a pair of link rods (c) attached to pins (c) (b)
are connected. On the other hand, shape memory alloy 0
Each end (A) (7) of a link lever (A) serving as a link mechanism for enlarging the telescopic stroke of 8) is connected.

A long 〇]) is formed in the middle part of the link lever (c).

The pin (C) attached to the piston (E) is inserted into the long 0υ of the link lever (C). Note that the mounting end 0 of the lid aυ is supported on the vehicle body side 9 by a pin (b) inserted into the arc-shaped elongated part (g).

Next, the effect will be explained.

If the temperature inside the engine room (9) of the snowmobile (]) is below the specified level, the force of the return spring pulling the piston rod is stronger than the stretching force of the old alloy θ barrel. Therefore, the piston (E) is pulled toward the cap OQ, and thereby the pin (A) that is engaged with the elongated part (G) of the link lever (C) is moved together with the piston (A).

Therefore, the link lever (A) is rotated counterclockwise in FIG. 3 about the one end (A). As a result, the lid (
II) Close the cooling air intake 1'00 as shown by the solid line in Figure 3. Next, when the engine (3) is driven and the temperature inside the engine room (9) falls below a predetermined value, the elongation force of the alloy ae exceeds the tensile force of the return spring Qυ. This pushes the piston (one) inside the inner tube o10. Then, the pin (a) of the piston 0 pushes the link rods (c) (g) along the long grooves (c) (c) of the outer tube 0υ. .This allows the piston (a) pin @
rotates the link lever (c) clockwise in FIG. 3 via the long Q-metal of the link lever (c). Link lever (
C) expands the amount of movement of the piston (A) to open the lid (]]).

In this way, the lid θυ is connected to the cooling air intake (as shown by the chain line in Figure 3).
Open II. As a result, the cooling air is guided from the inner surface of the lid θυ to the engine (3), especially the fuel system such as the carburetor, through the cooling air intake port 00, and cools the engine (3). According to this invention, a cooling air intake is provided in the fixed cover of the engine room, and a lid for guiding cooling air to the engine is attached to the cooling air intake so that it can be opened and closed in the direction of travel of the vehicle. A lid opening/closing device is provided to close the lid.
A return spring that biases the JM closing wing device in the closing direction, a coiled shape memory alloy that expands and contracts depending on the temperature in the engine room, and a shape memory alloy that is interposed between the lid and the shape memory alloy to expand and contract the shape memory alloy. The structure is equipped with a link mechanism that expands the line, so when the temperature inside the engine room exceeds a certain level, the coiled shape memory alloy automatically opens the lid against the wind pressure while driving. In addition, a link mechanism is provided to eliminate the lack of stroke to open the lid sufficiently when using shape memory alloy alone, so it is possible to obtain a sufficient stroke to open the lid and guide sufficient cooling air to the engine. I can do it.

As described above, in the present invention, it is possible to effectively adjust the temperature in the engine room with a simple configuration and eliminate malfunctions in the fuel system.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of a snowmobile to which this embodiment is applied, FIG. 2 is a plan view thereof, FIG. FIG. 4 is a partially cutaway perspective view of the lid opening/closing device. (1)...snowmobile, (3)...engine, (8)...
・・Fixed cover, (9)・・Engine room, α0・
...Cooling air intake, 0υ...lid, 021...lid opening/closing device, 0 barrel...shape memory alloy, Qυ...return spring,
(G)...Link Lever Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Oka 1) Kazuhide

Claims (1)

[Claims] (1) An engine room is constructed by covering the engine equipped in the vehicle with a fixed cover, a cooling air intake is provided in the fixed cover, and a lid is placed on the cooling air intake to guide the cooling air to the engine in the engine room. is installed so that it can be opened and closed in the direction of vehicle travel, and a lid opening/closing device is installed in the engine compartment.
The lid opening/closing device includes a return spring that biases the lid in the closing direction, a coiled shape memory alloy that expands and contracts depending on the temperature in the engine room, and a coil that is interposed between the lid and the shape memory alloy to expand and contract the shape memory alloy. A temperature control device for an engine room of a vehicle, comprising a link mechanism for increasing the temperature.