KR200245204Y1 - Rear bumper air resistance reduction device - Google Patents

Abstract

The present invention provides an actuator that is operated when the vehicle speed exceeds a predetermined speed to reduce the air resistance force that increases as air is introduced into the concave portion of the rear bumper that is convexly formed at the rear side when driving the vehicle, which hinders forward driving of the vehicle. By opening the air discharge port formed in the rear bumper by using the air flowing into the rear bumper naturally flows to the rear side to reduce the air resistance, formed on the upper side of the rear bumper 30 to the outside The air outlet 31 through which the discharged air A passes, the door 32 which opens and closes the air outlet 31, the front side of the door 32 and the rear bumper 30 are connected to each other. A plurality of hinges 33 for guiding the turning 32 in the vertical direction, an actuator 40 fixed to the rear bumper 30 to open and close the door 32, automatic The vehicle speed sensor 35 that measures the speed of the vehicle and outputs the vehicle speed data, and compares the vehicle speed data output from the vehicle speed sensor 35 with a predetermined speed and then determines that the vehicle speed is equal to or greater than a predetermined value. And a microcomputer 36 for outputting a driving signal for controlling the actuator 40 in the opening direction and outputting a driving signal for controlling the actuator 40 in the closing direction of the door 32 when it is determined that the vehicle speed is less than a predetermined value. And a driving means 37 for amplifying the output signal of the microcomputer 36 to drive the actuator 40.

Description

Rear bumper air resistance reduction device

The present invention relates to a device for reducing the rear bumper (REAR BUMPER) air resistance of the vehicle, and more particularly, it is increased as air enters into the concave portion of the rear bumper that is convexly formed to the rear side during the driving of the vehicle, thereby increasing the driving speed of the vehicle. In order to reduce the disturbance air resistance, the air resistance formed in the rear bumper is opened by opening the air vent formed in the rear bumper by using the actuator operated when the vehicle speed is over the predetermined speed, thereby reducing the air resistance by naturally flowing the air flowing inside the rear bumper to the rear side. It relates to a rear bumper air resistance reduction device of a car that can be made.

In general, since the rear bumper of the vehicle is convex toward the rear side as shown in FIG. 1 of the accompanying drawings, the rear bumper (11) and the rear bumper (11) are formed through the gap formed between the rear bumper 11 and the vehicle body 12 when the vehicle moves forward. As it enters the concave portion 11 of 11), it does not escape outwards and thus generates an air resistance that prevents the vehicle from traveling forward.

Therefore, when the vehicle accelerates from a low speed to a high speed, the acceleration performance is lowered by the air resistance force, and the driving force of the vehicle is reduced by the air resistance, thereby causing a problem of lowering fuel economy.

The present invention has been made to solve the above problems, the purpose of which can be generated by such air resistance by automatically controlling the air flowing into the concave portion of the rear bumper during the forward driving of the vehicle to naturally flow to the rear side It is to provide a rear bumper air resistance reduction device of a vehicle that can prevent the deterioration of the acceleration performance, and can improve the driving force of the vehicle that can be reduced by the air resistance to improve fuel efficiency.

In order to achieve the object of the present invention is formed in the upper portion of the rear bumper, the air outlet through which the air discharged from the inside and the outside, the door opening and closing the air outlet, the front side of the door and the rear bumper is connected A plurality of hinges for guiding the door in a vertical direction, an actuator fixed to the rear bumper to open and close the door, a vehicle speed sensor for measuring vehicle speed and outputting vehicle speed data, and a vehicle speed output from the vehicle speed sensor After receiving the data and comparing with the predetermined speed, if it is determined that the vehicle speed is higher than the predetermined value, the driving signal for controlling the actuator is output in the door opening direction. A microcomputer for outputting a driving signal to amplify the amplified output signal of the microcomputer The rear bumper of a car air resistance reduction device is provided with drive means for driving the actuator group.

1 is a cross-sectional view showing a rear bumper structure of a conventional vehicle

Figure 2 is a cross-sectional view showing an embodiment of the rear bumper air resistance reduction device of a vehicle according to the present invention

Figure 3 is a cross-sectional view showing another embodiment of the rear bumper air resistance reduction device of a vehicle according to the present invention

* Description of Signs of Main Parts of Drawings *

30: rear bumper 43: closing spring

A: Air 44: Piston

31: Air outlet 45: Upper pivot

32: door 46: piston road

33: hinge 47: intake manifold

40: actuator 42a: negative pressure chamber

35: vehicle speed sensor 48: negative pressure hose

36: microcomputer SV: solenoid valve

37: Driving means 51: Sector gear

41: Lower pivot BT: Battery

42: Cylinder tube M: Electric motor

52: Pinion

Figure 2 is a cross-sectional view showing an embodiment of a rear bumper air resistance reduction device of a vehicle according to the present invention, Figure 3 is a cross-sectional view showing another embodiment of a rear bumper air resistance reduction device of a vehicle according to the present invention, As described above, an air outlet 31 formed at an upper portion of the rear bumper 30 and passing air A discharged from the inside to the outside, a door 32 opening and closing the air outlet 31, and the door A plurality of hinges 33 which connect the front side of the front side 32 and the rear bumper 30 to guide the door 32 in the up and down direction, and are fixed to the rear bumper 30 to secure the door 32. The actuator 40 is opened and closed, the vehicle speed sensor 35 measuring the speed of the vehicle and outputting vehicle speed data, and the vehicle speed data received from the vehicle speed sensor 35 are compared with a predetermined speed, and the vehicle speed is then calculated. If it is determined that the predetermined value or more, 32 doors A microcomputer 36 for outputting a drive signal for controlling the actuator 40 in a direction and outputting a drive signal for controlling the actuator 40 in a closing direction of the door 32 when the vehicle speed is determined to be less than a predetermined value; The drive unit 37 for driving the actuator 40 by amplifying the output signal of the microcomputer 36 was configured.

The actuator 40 has a cylinder tube 42 which is freely installed in the rear bumper 30 by the lower pivot 41 as shown in the accompanying drawings showing an embodiment of the present invention and The piston 44 is inserted into the cylinder tube 42 and receives a constant tension by the closing spring 43, and at the same time defines a piston 44, and a lower end is connected to the piston 44, and an upper end is connected to the upper pivot 45. The piston rod 46 and the intake manifold 47 of the engine and the cylinder tube which are installed in the door 32 to transmit the force of the piston 44 and the closing spring 43 to the door 32. A solenoid valve (SV) installed on a negative pressure hose 48 for connecting the negative pressure chamber 42a provided at 42 to open and close a passage in accordance with a signal of a driving means 37 controlled according to an output signal of the microcomputer 36. ).

The actuator 40 is projected downward from the bottom of the door 32, as shown in FIG. 3 of another embodiment of the present invention, and has a sector gear having the same center as the center of rotation of the door 32 ( 51) and an electric motor (M) fixed to the rear bumper (30) and supplied with electric power from the battery (BT) of the vehicle, and installed on the motor shaft of the electric motor (M) and engaged with the sector gear (51). Composed of pinion (52).

Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.

First, in the exemplary embodiment as shown in FIG. 2, the vehicle speed data input from the vehicle speed sensor 35 for a very short time while driving is input to a register which is a temporary storage location of the microcomputer 36, and the previous vehicle speed data. And vehicle speed data measured next are compared with each other.

At this time, when the calculation result that the next measured vehicle speed data is larger than the previous vehicle speed data is calculated, the microcomputer 36 outputs a drive signal to the drive means 37 through the output port to operate the actuator 40. The actuator 40 opens the door 32. In this process, the opening amount of the door 32 is continuously adjusted by applying a drive signal to the driving means 37 and operating the actuator 40 while giving a delay time proportional to the speed difference.

That is, when the changing vehicle speed is decelerated, the actuator 40 pulls the door 32 downward and moves in the direction in which the door 32 is closed, so that the air flowing into the rear bumper 30 when the forward driving flows out is discharged. The action of narrowing the passageway of the outlet 31 to suppress drag is generated, and if the changing vehicle speed is accelerated, the actuator 40 pushes the door 32 upward so that the door 32 moves in the opening direction. As the air flowing into the rear bumper 30 flows forward, the passage of the air outlet 31 flows out, and the rear bumper discharges a lot of air flowing into the rear bumper 30 in proportion to the increased speed. It is to act to reduce the air resistance by (30). In this process, the opening amount of the door 32 is determined according to the speed difference.

In addition, the operation of the actuator 40 remains in the negative pressure chamber 42a formed in the cylinder tube 42 from the intake manifold 47 of the engine when the valve opens due to the excitation current flowing through the solenoid valve SV. As the air is sucked into the intake manifold 47, the piston 44 and the piston rod 46 move upward, and the negative pressure and the closing spring formed in the negative pressure chamber 42a according to the opening amount of the solenoid valve SV. At the point where the elastic force of 43 is balanced, the movement of the piston 44 and the piston rod 46 is stopped to maintain the opening position of the door 32.

That is, when the solenoid valve SV is closed, the piston 44 and the piston rod 46 are formed between the piston rod 46 and the cylinder tube 42 while being pushed by the elastic force of the closing spring 43. The door 32 is closed by returning while receiving outside air through the gap.

In the process as described above, the microcomputer 36 receives the vehicle speed data periodically from the vehicle speed sensor 35 through the input port, and changes the opening amount of the door 32 according to the vehicle speed from time to time.

On the other hand, in another embodiment as shown in Figure 3, the operation of the microcomputer 36, the vehicle speed sensor 35, the drive means 37 is the same as in the previous example, the actuator 40 is of a different structure Only the operation of) will be described.

First, if the changing vehicle speed is deceleration, the electric motor M is rotated in the reverse direction to give the sector gear 51 a downward rotation force through the pinion 52, and the door by the sector gear 51 moving downwards. 32 moves in the closing direction. At this time, the action of reducing the drag occurs by narrowing the passage of the air outlet 31 through which air flowing into the rear bumper 30 flows out during the forward driving.

And if the changing vehicle speed is accelerated, the electric motor (M) is rotated in the forward direction to give a rotational force moving upwards to the sector gear 51 through the pinion (52), the door (by the sector gear 51 moving upwards) 32) moves in the open direction. At this time, the air flowing into the rear bumper 30 flows to the rear of the rear bumper 30 by discharging a lot of air flowing into the rear bumper 30 in proportion to the increased speed by expanding the passage of the air outlet 31. ) Will reduce air resistance.

As described above, when the vehicle accelerates at a low speed to a high speed, the air flowing into the rear bumper can flow naturally to the rear side through the air outlet so that the acceleration performance is improved by reducing the air resistance. There is an effect to reduce, and the reduction by the air resistance is to reduce the driving force of the vehicle has the effect of improving fuel economy.

Claims (3)

An air outlet 31 formed at an upper portion of the rear bumper 30 to allow air A discharged from the inside to the outside, a door 32 opening and closing the air outlet 31, and the door 32. A plurality of hinges 33 which connect the front side of the rear bumper 30 and guide the door 32 in the vertical direction, and the actuator fixed to the rear bumper 30 to open and close the door 32. 40, a vehicle speed sensor 35 that measures the speed of the vehicle and outputs vehicle speed data, and compares the vehicle speed data output from the vehicle speed sensor 35 with a predetermined speed and then calculates the vehicle speed more than a predetermined value. If it is determined that the driving signal for controlling the actuator 40 in the door 32 opening direction outputs the drive signal for controlling the actuator 40 in the closing direction of the door 32 when the vehicle speed is determined to be less than a predetermined value The microcomputer 36 and the output of the microcomputer 36 An amplifier to reduce air resistance on the rear bumper of a car, characterized in that configured in the driving means 37 for driving the actuator (40) of the device. According to claim 1, wherein the actuator 40 is inserted into the cylinder tube 42 and the cylinder tube 42, the pivot movement is freely installed inside the rear bumper 30 by a lower pivot (41) The piston 44 receives constant tension by the closing spring 43 and at the same time partitions the inside thereof, and a lower end is connected to the piston 44, and an upper end is installed on the door 32 by the upper pivot 45. The piston rod 46 for transmitting the force of the piston 44 and the closing spring 43 to the door 32, the intake manifold 47 of the engine and the negative pressure chamber 42a provided in the cylinder tube 42 The rear of the vehicle, comprising a solenoid valve (SV) installed on the negative pressure hose 48 to be connected to open and close the passage in accordance with the signal of the drive means 37 controlled in accordance with the output signal of the microcomputer 36. Bumper air drag reduction device. 2. The actuator (40) according to claim 1, wherein the actuator (40) protrudes downward from the bottom of the door (32) and has a center of gravity equal to the center of rotation of the door (32) and the rear bumper (30). It is fixed to the electric motor (M) which is supplied to the electric power from the battery (BT) of the vehicle and the pinion (52) is installed on the motor shaft of the electric motor (M) is fitted to the sector gear (51) Rear bumper air resistance reduction device for cars.