SYSTEM ABLE TO CHANGE CROSS-SECTIONAL AREA OF AIR INTAKE TUBE

Abstract

A system able to change a cross-sectional area of an air intake tube is provided. The system is disposed between a throttle valve and an air intake tube of an air cleaner, and includes an adjustment device, a control module, and a stepping motor. The adjustment device includes a retaining seat, a rotating disc fitted in the retaining seat, a plurality of blades disposed on the retaining seat and the rotating disc. After the control module receives signals of an engine and the throttle valve and transmits a control signal to the stepping motor, the stepping motor drives the rotating disc to pivot the blades for controlling the cross-sectional area of an opening of the air intake tube.

Claims

1. A system able to change a cross-sectional area of an air intake tube, the system being disposed between a throttle valve and an air intake tube of an air cleaner, the air intake tube being formed with an accommodation trough therein, the system comprising: an adjustment device, comprising: a retaining seat, the retaining seat having a hollow annular shape and being provided with a plurality of perforations, the retaining seat being locked to the air intake tube; a rotating disc, the rotating disc having a hollow annular shape and being provided with a plurality of through holes and a fixing groove, the rotating disc being movably fitted in an annular space of the retaining seat; a plurality of blades, the blades being annularly disposed on the retaining seat and the rotating disc to form an opening of the air intake tube, the blades each having holes corresponding to the perforations of the retaining seat and the through holes of the rotating disc; and a plurality of locking pins, the locking pins being inserted through the holes of the blades and locked to the perforations of the retaining seat and the through holes of the rotating disc respectively so that the blades and the rotating disc can be pivoted on the retaining seat; a control module, connected with an engine and the throttle valve and being able to transmit a control signal to a stepping motor after receiving a rotational speed signal of the engine and a pressure value signal of the throttle valve; the stepping motor, disposed in the accommodation trough and connected to the fixing groove of the rotating disc through a connecting lever, the stepping motor being connected with the control module, wherein after the stepping motor receives the control signal, the stepping motor drives the rotating disc to turn so that the rotating disc links the blades to control a cross-sectional area of the opening of the air intake tube to be decreased or increased.

2. The system as claimed in claim 1, wherein the blades each have an arc shape.

3. The system as claimed in claim 1, wherein the air intake tube is a two-section tube, the air intake tube is formed with at least two screw holes, the retaining seat is provided with screw holes corresponding to the screw holes of the air intake tube, and the retaining seat is locked between two sections of the air intake tube through locking members.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic view showing the assembly of the system of the present invention;

[0011] FIG. 2 is a block diagram showing the connection of the system of the present invention;

[0012] FIG. 3 is a sectional view showing the connection of the system of the present invention;

[0013] FIG. 4 is an exploded view of the adjustment device of the present invention;

[0014] FIG. 5 is a schematic view showing the reduction of the cross-sectional area; and

[0015] FIG. 6 is a schematic view showing the enlargement of the cross-sectional area.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Advantages and features of the inventive concept and methods of accomplishing the same may be understood more readily by reference to the following detailed description of embodiments and the accompanying drawings. The inventive concept may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0017] Referring to FIG. 1 and FIG. 2, the present invention discloses a system 1 able to change a cross-sectional area of an air intake tube. The system 1 is disposed between a throttle valve 2 and an air intake tube 4 of an air cleaner 3. In an embodiment of the present invention, the air intake tube 4 is a two-section tube (referring to FIG. 3). The air intake tube 4 is formed with at least two screw holes 41. One section of the air intake tube 4 is provided with an accommodation trough 421. The accommodation trough 421 is formed with an engaging wall 421 therein. The system 1 comprises an adjustment device 11, a control module 12, and a stepping motor 13. The adjustment device 11 comprises a retaining seat 111, a rotating disc 112, a plurality of blades 113, and a plurality of locking pins 114 (referring to FIG. 4). The retaining seat 111 has a hollow annular shape, and is provided with a plurality of perforations 1111 and screw holes 1112 corresponding to the screw holes 41 of the air intake tube 4. The retaining seat 111 is locked between the two sections of the air intake tube 4 through locking members 6. The rotating disc 112 has a hollow annular shape, and is provided with a plurality of through holes 1121 and a fixing groove 1122. The rotating disc 112 is movably fitted in an annular space of the retaining seat 111. The blades 113 are annularly disposed on the retaining seat 111 and the rotating disc 112 to form an opening 1132 of the air intake tube 4, referring to FIG. 5. The blades 113 each have holes 1131 corresponding to the perforations 1111 of the retaining seat 111 and the through holes 1121 of the rotating disc 112. Preferably, the blades 113 each have an arc shape. The locking pins 114 are inserted through the holes 1131 of the blades 113 and locked to the perforations 1111 of the retaining seat 111 and the through holes 1121 of the rotating disc 112, respectively, so that the blades 113 and the rotating disc 112 can be pivoted on the retaining seat 111. The control module 12 is connected with an engine 5 and the throttle valve 2. After receiving a rotational speed signal of the engine 5 and a pressure value signal of the throttle valve 2, the control module 12 transmits a control signal to the stepping motor 13. The stepping motor 13 is engaged on the engaging wall 421 of the accommodation trough 42 of the air intake tube 4 and connected to the fixing groove 1122 of the rotating disc 112 through a connecting lever 14. The stepping motor 13 is connected with the control module 12. After the stepping motor 13 receives the control signal, the rotating disc 112 is driven by the connecting lever 14 to rotate, and the blades 113 are linked by the rotating disc 12 to control the cross-sectional area of the opening 1132 of the air intake tube 4 within a restricted range.

[0018] Next, referring to FIG. 2 to FIG. 4, when in use, the system 1 is locked to the air intake tube 4, and the control module 12 is connected with the engine 5 and the throttle valve 2. When the engine 5 is at a low rotational speed, the required air inflow is small. After the control module 12 receives the rotational speed signal of the engine 5 and the pressure value signal of the throttle valve 2, the control module 12 transmits a control signal to the stepping motor 13. The stepping motor 13 has a drive shaft 131 to drive the connecting lever 14 according to the control signal, so that the rotating disc 112 of the adjustment device 11 is rotated counterclockwise in the retaining seat 111 (as shown in FIG. 5), meanwhile, the rotating disc 112 is rotated to link the blades 113 to be pivoted to reduce the cross-sectional area A of the opening 1132 of the air intake tube 4 so as to decrease the amount of air entering the throttle valve 2.

[0019] When the engine 5 is at a high rotational speed, the required air inflow is large. After the control module 12 receives the rotational speed signal of the engine 5 and the pressure value signal of the throttle valve 2, the control module 12 transmits a control signal to the stepping motor 13. The stepping motor 13 has the drive shaft 131 to drive the connecting lever 14 according to the control signal, so that the rotating disc 112 of the adjustment device 11 is rotated clockwise in the retaining seat 111 (as shown in FIG. 6), meanwhile, the rotating disc 112 is rotated to link the blades 113 to be pivoted to enlarge the cross-sectional area A of the opening 1132 of the air intake tube 4 so as to increase the amount of air entering the throttle valve 2.

[0020] Accordingly, the system of the present invention clearly achieves the following effects:

[0021] 1. The system of the present invention is disposed between the throttle valve and the air intake tube of the air cleaner. After the control module receives the signals of the engine and the throttle valve, the control module controls the stepping motor to drive the rotating disc of the adjustment device to turn clockwise or counterclockwise according to the rotational speed of the engine, thereby adjusting the cross-sectional area of the air intake tube in cooperation with different rotational speeds of the engine.

[0022] 2. The system of the present invention is capable of changing the cross-sectional area of the opening of the air intake tube according to the demand of the engine at different rotational speeds, thereby improving the inertia retention of the air and greatly improving the volumetric efficiency of the engine.

[0023] Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.