JPS6143232B2 - - Google Patents

Description

[Detailed Description of the Invention] A front air spoiler is installed for the purpose of improving aerodynamic characteristics, and deploying downward during high-speed driving to reduce vehicle aerodynamic drag and lift improves driving stability. It is also known to be useful in improving fuel efficiency. However, when driving at low speeds, there are many opportunities for interference with curbs, uneven road surfaces, etc., so it is necessary to raise the front air spoiler to prevent damage.

The applicant had previously filed Japanese Patent Application No. 121869/1986.
In No. 121870 (Japanese Unexamined Patent Publication No. 58-22768), a movable front air spoiler was proposed, in particular, one in which the negative pressure generated in the engine manifold was used as its actuator.

However, the device of the above-mentioned application only has a switching valve (vacuum switching valve) that switches between atmospheric pressure and negative pressure between the intake manifold and the vacuum actuator, and when negative pressure is introduced to the actuator, the actuator This system is activated to deploy the front air spoiler downward. However, in general, when the engine load increases, such as when the vehicle is accelerating or climbing a hill,
Even though it is necessary to deploy the front air spoiler downward, the negative pressure in the intake manifold decreases, causing the problem that sufficient negative pressure cannot be obtained to deploy the air spoiler downward. .

It is an object of the present invention to solve the above-mentioned conventional problems by controlling the communication between the engine intake manifold and the negative pressure chamber of the vacuum actuator in accordance with the negative pressure value of the engine intake manifold. The feature is that a one-way valve is provided on the passage connecting the engine intake manifold and the negative pressure chamber of the vacuum actuator, which closes when the intake manifold negative pressure falls below a predetermined level, so that the engine intake manifold can be closed during acceleration or when climbing a slope. When the negative pressure falls below a predetermined level, the passage is closed so that the negative pressure in the negative pressure chamber of the vacuum actuator does not escape, the diaphragm of the vacuum actuator continues to operate, and the front air spoiler is moved downward. By continuing to maintain the deployed state, the effect of the front air spoiler can be fully demonstrated, contributing to the improvement of the vehicle's aerodynamic characteristics, and when driving at low speeds, the negative pressure passage to the negative pressure chamber of the vacuum actuator is opened and the front air spoiler is maintained. In order to raise the air spoiler and deal with obstacles such as uneven road surfaces, a vacuum switching valve, which is operated by a control switch that responds to vehicle speed or is turned on and off manually, is installed in the negative pressure chamber of the vacuum actuator. A movable front air spoiler is provided on a passage connecting an engine intake manifold and an engine intake manifold.

The effect of the present invention is to simply add a one-way valve to the conventional negative pressure passage from the engine intake manifold, which opens when the engine negative pressure exceeds a certain level and closes when it falls below a specified level. This eliminates the unnecessary movement of the conventional front air spoiler, which rises during acceleration or when climbing a hill, improving the durability of the air spoiler mounting part and ensuring reliable operation over a long period of time. There is an effect that can be done.

One embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a side view of an automobile having a movable front air spoiler showing an embodiment of the present invention, and Fig. 2 shows details of the main parts in Fig. 1. FIG. In the figure, reference numeral 1 denotes a movable front air spoiler, one end of which is pivoted to the vehicle body via a pin 2, swings up and down around the pin 2, and can be deployed downward as shown in FIG. Further, 3 is a vacuum actuator, 4 is a vacuum switching valve, 5 is a one-way valve, 6 is an engine intake manifold, and 7 is a vacuum switching valve that responds to the vehicle speed provided on the power supply circuit 8 of 4. This is an air spoiler control switch that can be turned on or off, or manually operated by the passenger.

Vacuum actuator 3 is diaphragm 9
It is divided into a negative pressure chamber 10 and an atmospheric chamber 11, and negative pressure from the engine intake manifold 6 is introduced to the negative pressure chamber 10 via a passage 12. An arm 13 is connected to the atmospheric chamber 11 side of the diaphragm 9, a link 14 is pivotally attached to the arm 13, and one end of the link 14 is pivotally attached to the front air spoiler 1 via a pin 15. . A spring 16 is provided in the negative pressure chamber 10 and biases the diaphragm 9 toward the atmospheric chamber 11.

Vacuum switching valve 4 is shown as a solenoid valve in the drawings, but it may also be a manual switching valve. 17 is an electromagnetic coil, 18 is a plunger, 19 is a spring that urges the valve 20 at the tip of the plunger 18 to press against the valve seat, and 21 is a connection between the atmosphere and the negative pressure passage 1 by the valve 20.
A hole 23 that communicates with the coils 2 and 22 is a power source that sends current to the electromagnetic coil 17 through the power circuit 8.

The one-way valve 5 is a feature of the present invention, and is disposed on a passage 22 connecting the vacuum switching valve 4 and the intake manifold 6, and when the intake manifold negative pressure is greater than a predetermined value,
The valve 24 opens against the spring 25,
This is a one-way valve that is pushed by a spring 25 to close when the engine intake manifold negative pressure becomes less than a predetermined value.

Next, to explain the operation, when the automobile is running at a constant speed, intake manifold negative pressure higher than a predetermined negative pressure is generated in the intake manifold 6, so the one-way valve 5 is open, and the vacuum switching valve 4 is opened at the vehicle speed. or manually, when valve 20 closes hole 21 as shown.
The negative pressure is led to the negative pressure chamber 10 through the passages 22 and 12, and the diaphragm 9 moves downward, and the arm 1
3. The air spoiler 1 swings downward about the pin 2 via the link 14, and is expanded downward as shown in FIG.

When the vehicle starts running at a low speed, the control switch 7 senses the low speed and turns on, and current from the power source 23 flows through the electromagnetic coil 17 and pulls up the plunger 18 against the spring 19.
opens the hole 21, the negative pressure in the negative pressure chamber 10 is discharged through the passage 12, and the pressure in the negative pressure chamber 10 and the atmospheric chamber 11 becomes the same, so the diaphragm 9 is raised by the spring 16, and the arm 13 and link 14, the front air spoiler 1 is pulled upwards around the pin 2. In this case, the same operation is performed even if the control switch 7 is turned on manually by the passenger.

Next, when the vehicle accelerates or starts climbing a hill, the intake manifold negative pressure becomes lower than the predetermined pressure. In this state, until now Spring 2
The valve 24 of the one-way valve 5, which had been open against the pressure 5, is closed. In this case, of course, the control switch 7 of the vacuum switching valve 4 is turned off and it is inactive, and the valve 20 is closed. Therefore, since the one-way valve 5 is closed, the negative pressure in the negative pressure chamber 10 does not escape to the intake manifold 6 side, and the negative pressure remains as it is, and the diaphragm continues to move downward against the spring 16. The air spoiler 1 also extends downward around the pin 2, which can reduce aerodynamic drag and lift during acceleration or hill climbing, which is particularly desired.

[Brief explanation of the drawing]

FIG. 1 is a side view of an automobile equipped with a movable front air spoiler showing an embodiment of the present invention, and FIG. 2 is a system diagram showing details of the main parts in FIG. Explanation of the main parts of the diagram 1... Movable front air spoiler, 2... Pin, 3... Vacuum actuator, 4... Vacuum switching valve, 5... One-way valve, 6... Engine intake manifold,
7... Air spoiler control switch, 9... Diaphragm, 10... Negative pressure chamber, 12... Passage, 13... Arm, 14... Link, 15... Pin, 16... Spring, 17... Electromagnetic coil, 18... Plunger, 20
...valve, 22...passage, 24...valve.

Claims (1)

[Claims] 1 Directly attach the front air spoiler to the front air spoiler that is movably attached to the vehicle body.
Alternatively, a vacuum actuator operated by negative pressure introduced from the engine intake manifold is connected to be driven via a link mechanism, and the negative pressure from the engine intake manifold is introduced into the negative pressure chamber of the actuator. in some cases,
In a movable front air spoiler that operates to deploy the front air spoiler downward via the link mechanism, the diaphragm is mounted on a passage connecting the negative pressure chamber of the actuator and the engine intake manifold in response to vehicle speed or manually. A vacuum switching valve is provided which is operated by a control switch that is turned on and off by the valve, and a one-way valve is provided on the passage between the valve and the intake manifold, which opens when the manifold negative pressure exceeds a predetermined value and closes when the negative pressure of the manifold falls below a predetermined value. A movable front air spoiler characterized by the provision of a movable front air spoiler.