KR100906381B1 - By-pass valve for vehicle - Google Patents

Abstract

A bypass valve for a vehicle is provided to discharge exhaust gas directly or discharge exhaust gas after cooling it. A bypass valve for a vehicle comprises a first inlet and a first outlet(112b) which are connected to an exhaust manifold and an intake manifold, a second outlet(114b) which discharges exhaust gas to an EGR(Exhaust Gas Recirculation) cooler, a second inlet(116a) wherein a exhaust gas flows from the EGR cooler, a valve housing(110) which comprises a partition partitioning the first inlet and the first outlet, and the second inlet and the second outlet, a flap which selectively opens and closes the connection hole inside of the valve housing, a shaft(130) whereof one end pass through the valve housing and is coupled with the flap, and an actuator(150) rotating the shaft.

Description

Automotive bypass valves {BY-PASS VALVE FOR VEHICLE}

The present invention relates to a vehicle bypass valve for use in an exhaust gas recirculation system of an engine, and specifically, a vehicle bypass that is simple in structure and easy to manufacture and can reduce manufacturing costs, and can simplify an exhaust gas recirculation system. Relates to a pass valve.

In general, the vehicle's emission refers to a gas emitted from the engine by the combustion engine from the engine through the exhaust pipe, and the exhaust gas includes carbon monoxide (CO), nitrogen oxides (NO _X ), and unburned hydrocarbons (HC). Contains hazardous substances.

Among the harmful substances contained in these exhaust gases, nitrogen oxides have an inverse causal relationship with carbon monoxide and hydrocarbons. In other words, nitrogen oxides are generated the most when carbon monoxide and hydrocarbons are discharged the least. For example, as the fuel is completely burned, its amount increases.

Therefore, various technologies for reducing pollutants in exhaust gas have been developed by regulating the allowable amount of pollutants including nitrogen oxides as related laws, and one of them is exhaust gas recirculation (EGR). .

The above-described exhaust gas recirculation system is a system for reducing the generation amount of nitrogen oxides by lowering the maximum combustion temperature while minimizing a decrease in output by recycling a portion of the exhaust gas. In more detail, when the exhaust gas containing carbon dioxide (CO ₂ ), which has a larger heat capacity than nitrogen (N ₂ ), is mixed in an appropriate ratio in the mixer, the maximum combustion temperature of the engine can be lowered. The amount of generation can be reduced.

FIG. 6 is a schematic view showing a general exhaust gas recirculation system, and FIG. 7 is an exploded perspective view showing an EG cooler assembly according to the prior art.

As described above, the exhaust gas recirculation system 1 is to reduce the generation of nitrogen oxides by recycling a part of the exhaust gas discharged through the exhaust manifold 3 to the intake manifold 2. On the recirculation path, an EG cooler assembly 4 for supplying exhaust gas in a cooled state is installed.

The EZR cooler assembly 4 is a shell & tube type heat exchanger, and is cooled by an inlet pipe 5a through which high-temperature exhaust gas flows in both ends and the EZR cooler assembly 4. The outlet pipe 5b through which the exhaust gas is discharged is connected. In this case, the EZR cooler assembly 4 uses the coolant of the engine 5 to cool the high temperature exhaust gas introduced through the inlet pipe 5a, and the inlet pipe so that the coolant can be introduced and discharged. It further includes 46 and the discharge pipe (48).

On the other hand, with reference to Figure 7 in more detail with respect to the Igal cooler assembly, the Igal cooler assembly 4 is largely provided by the Igal cooler 40 and the one side of the Igal cooler 40 bypass It consists of a valve 50.

The EZR cooler 40 is a shell and tube type, which is connected to an inlet pipe (5a in FIG. 6) and an inlet port 42 through which high-temperature exhaust gas flows in and the outlet pipe (5b in FIG. 6). ) Is connected to the exhaust port 44 for discharging the cooled exhaust gas is formed. In addition, the engine cooling water further includes an inlet and outlet inlet tube 46 and an outlet tube 48.

The bypass valve 50 is provided on one side of the EG cooler 4 as described above, and is a means for selectively opening and closing the inlet 42 and the outlet 44. The inlet passage 52a and the outlet passage ( A valve housing 52 having a 52b formed therein; a flap (not shown) provided inside the valve housing 52 to selectively open and close the inflow passage 52a and the discharge passage 52b; Actuator 54 is included.

At this time, the above-described conventional bypass valve 50 has a structure capable of cooling the high-temperature exhaust gas by using the coolant similarly to the EG cooler 4, and the inlet pipe 56a through which the coolant is introduced and discharged. And a discharge pipe 56b.

However, in order to cool the exhaust gas using the cooling water, a flow path (not shown) must be formed inside the valve housing 52, and the inlet pipe 56a and the discharge pipe 56b through which the coolant is introduced and discharged as described above. This should be provided in addition. Therefore, the structure of the bypass valve 50 is complicated and difficult to manufacture, there is a disadvantage that takes a lot of cost when manufacturing. In addition, the cooling effect of the exhaust gas by the cooling water is inefficient, and in particular, the exhaust gas recirculation system 1 is complicated because an apparatus (e.g., an inflow pipe and an exhaust pipe) for supplying the cooling water to the bypass valve 50 must be added. There is a disadvantage of losing.

The present invention has been made to solve the above-mentioned problems, and its object is to provide a bypass valve for a vehicle that is simple in structure and easy to manufacture and can reduce manufacturing cost.

Another object of the present invention is to provide a bypass valve for a vehicle that can simplify the exhaust gas recirculation system.

In the vehicle bypass valve according to the present invention for achieving the above object, a first inlet and a first outlet connected to the exhaust manifold and the intake manifold of the vehicle are respectively formed at both ends, and exhaust gas is discharged by an IG cooler. A second inlet and a second inlet through which the exhaust gas flows from the EZR cooler are formed on one side, and the first inlet, the first outlet, and the second inlet and the second outlet are partition walls which form a connection hole. Valve housing comprising a; A flap provided to be rotatable with respect to a central axis within the valve housing to selectively open and close the connection hole; A shaft coupled to the flap through the valve housing; And an actuator for rotating the shaft.

The actuator may include a body in which a vacuum chamber is provided, a diaphragm provided inside the body, a spring for providing elasticity to the diaphragm, one end of which is connected to the diaphragm, and the other end of which is connected to the shaft. Consists of tappets.

The bypass valve for a vehicle according to the present invention configured as described above does not require a configuration for inflow and discharge of cooling water, and does not have to form a flow path inside the valve housing. Can be saved. In particular, since it is not necessary to separately provide a configuration for supplying cooling water to the vehicle bypass valve according to the present invention as described above has the advantage that can simplify the exhaust gas recirculation system.

With reference to the accompanying drawings will be described embodiments of the present invention; In this case, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a perspective view showing a vehicle bypass valve according to the present invention, Figure 2 is an exploded perspective view showing a vehicle bypass valve according to the present invention. 3 and 4 are sectional views showing the valve housing of the vehicle bypass valve according to the present invention, and FIG. 5 is a sectional view showing the actuator of the vehicle bypass valve according to the present invention.

The bypass valve for a vehicle according to the present invention is a bypass valve used in an exhaust gas recirculation system (EGR), and more specifically, a bypass valve for selectively cooling the exhaust gas recycled by being combined with an EG cooler. It is a pass valve.

Looking at the bypass valve for a vehicle according to the invention with reference to the drawings as follows.

The vehicle bypass valve 100 according to the present invention includes a valve housing 110 including a flap 120 formed on the transfer passages 112, 114, and 116 and having the exhaust passages 112, 114, and 116 formed therein. The actuator 150 is configured to selectively open and close the flap 120 using the engine negative pressure of the vehicle.

First, referring to the valve housing 110, the valve housing 110 is formed in the form of a block of a rectangular parallelepiped, the exhaust passages 112, 114, 116 are formed therein. The first inlet 112a and the first inlet 112a and the second end of the transfer passage 112 connecting the exhaust manifold 200 and the intake manifold 300 through the valve housing 110 in the longitudinal direction One outlet 112b is formed. In addition, a second discharge port 114b is formed at one end of the IR cooler 400 in the second transfer passage 114 connecting the exhaust manifold 200 and the IR cooler 400, and the intake manifold is formed. A second inlet 116a is formed at one end of the IR cooler 400 in the third transfer path 116 connecting the 300 and the IR cooler 400.

In this case, a partition wall 118 dividing the first transfer passage 112 and partitioning the second transfer passage 114 and the third transfer passage 116 is formed in the valve housing 110. The partition wall 118 is formed with a connection hole 119 having a predetermined diameter, and the connection hole 119 is provided with a flap 120 which is rotated about a central axis to selectively open and close the connection hole 119 as necessary. do.

As described above, the vehicle bypass valve including the valve housing 110 formed as described above selectively opens and closes the connection hole 119 to directly discharge the exhaust gas by controlling the rotation of the flap 120. It can be discharged by cooling or discharged by cooling.

In more detail, when the connecting hole 119 is closed by rotating the flap 120 in the forward direction (referred to as 0 degrees), the exhaust gas introduced through the first inlet 112a is transferred to the first transfer path ( It is discharged through the 112 and the second transfer passage 114 to the second discharge port (114b) flows into the EZ cooler 400, cooled to a predetermined temperature in the EZ cooler 400 and then the second inlet ( It is discharged through the first discharge port 112b via the third transfer passage 116 and the first transfer passage 112 through 116a.

On the other hand, when the connecting hole 119 is opened by rotating the flap 120 in the reverse direction (referred to as 80 degrees), the exhaust gas introduced through the first inlet 112a may be the second and third transfer passages 114 and 116. It is directly discharged through the first outlet 112b along the first transfer path 112 without passing through.

Here, the rotation angle of the flap 120 for selectively opening and closing the connection hole 119 is preferably within 80 degrees. This is to allow the flap 120 to be easily returned to its initial position (0 degrees), and as described above, when the rotation angle is set within 80 degrees, the flap 120 can be returned even at a small force such as negative pressure of the engine. to be.

On the other hand, as shown in Figure 4, the flap 120 is coupled to the shaft 130 penetrating through the valve housing 110 at the position of the connection hole 119, one end of the shaft 130 Is exposed to the outside of the valve housing 110 is coupled to the tappet 159. In addition, a bearing 142 is provided between the valve housing 110 and the shaft 130 to smoothly rotate the shaft 130, and foreign matter flows into the bearing 142 on one side of the bearing 142. A shaft seal (shaft-seal, 144) is provided to prevent it from being, and one side of the shaft seal (144) is provided with a seal plate (140) to prevent separation of the shaft seal (144). In this case, the seal plate 140 is preferably press-fitted to the valve housing 110 in order to prevent the flow and departure in the process of rotating the shaft 130.

On the other hand, the valve housing 110 is formed with a plurality of screw coupling grooves 117 for coupling with the intake and exhaust management (300, 200), the EG cooler 400, the plurality of screw coupling groove ( 117 of the intake and exhaust manifold (300,200), the screw coupling groove to which the long screw is coupled for coupling with the EZ cooler 400 can be reinforced by reinforcement to prevent bending or damage of the valve housing (110) It was made.

The actuator 150 includes a body 154 in which the vacuum chamber 152 is provided, a diaphragm 156 provided in the body 154, a spring 158 that provides elasticity to the diaphragm 156, and One end of the tappet 159 is connected to the diaphragm 156 through the body 154 and the other end is connected to the shaft 130.

In this case, the body 154 is provided with a vacuum chamber 152 therein, a body 154b having a plurality of fastening protrusions 162 formed along the circumference, and coupled to the body 154b and the fastening protrusion 162. And a cap 154c having a fastening groove 164 formed at a position corresponding thereto. At this time, at least seven fastening protrusions 162 and fastening grooves 164 are formed, and are preferably disposed at equal intervals along the circumference of the body 154b and the cap 154c. In addition, the body 154, more specifically, the discharge hole 166 is formed in the body 154b, so that the foreign substances introduced into the body 154 can be discharged.

Meanwhile, ribs 168 are formed on at least one side of the tappet 159. The ribs 168 are tappets due to a shock applied from the outside or a load applied in a process in which the actuator 150 operates. As a means for preventing the warping of the 159 is preferably formed in a zigzag shape as shown in the figure.

On the other hand, the actuator 150 is coupled to the valve housing 110 through the L-shaped bracket 170, the L-shaped bracket 170 also in the process of the external shock or the actuator 150 is operating It is preferable to emboss 169 the inner edge of the inner edge to prevent bending due to the applied load.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a perspective view showing a bypass valve for a vehicle according to the present invention.

2 is an exploded perspective view showing a bypass valve for a vehicle according to the present invention;

3 and 4 are cross-sectional views showing the valve housing of the vehicle bypass valve according to the present invention.

Fig. 5 is a sectional view showing an actuator of a vehicle bypass valve according to the present invention.

6 is a schematic diagram illustrating a typical exhaust gas recirculation system.

Figure 7 is an exploded perspective view showing an EG cooler assembly according to the prior art.

* Description of the symbols for the main parts of the drawings *

100: vehicle bypass valve 110: valve housing

120: flap 130: shaft

140: seal plate 150: actuator

170: bracket

Claims (9)

In the bypass valve 100 used in the vehicle exhaust gas recirculation system, The first inlet 112a and the first outlet 112b connected to the exhaust manifold 200 and the intake manifold 300 of the vehicle are respectively formed at both ends, and exhaust gas is discharged to the EZ cooler 400. A second inlet 116a through which the exhaust gas flows from the second outlet 114b and the easy cooler 400 is formed at one side thereof, and the first inlet 112a and the first outlet 112b are formed. A valve housing 110 that partitions the inlet 116a and the second outlet 114b and includes a partition wall 118 in which a connection hole 119 is formed; A flap 120 provided to be rotatable with respect to a central axis within the valve housing 110 to selectively open and close the connection hole 119; A shaft 130 penetrating the valve housing 110 and coupled to the flap 120; And Including an actuator 150 for rotating the shaft 130, The actuator 150 includes a body 154 in which a vacuum chamber 152 is provided, a diaphragm 156 provided in the body 154, and a spring 158 that provides elasticity to the diaphragm 156. And a tappet 159, one end of which is connected to the diaphragm 156 through the body 154 and the other end of which is connected to the shaft 130, The body 154 of the actuator 150 has a foreign substance discharge hole 166 is formed, Ribs are formed on at least one side of the tappet 159, The body 154 is provided with a vacuum chamber 152 therein, a body 154b having a plurality of fastening protrusions 162 formed along the circumference, and coupled to the body 154b and being fastened to the fastening protrusion 162. The fastening groove 164 is formed in the corresponding position, Rotation angle of the flap 120 is 0 ~ 80 degrees, The actuator 150 is coupled to the valve housing 110 through the L-shaped bracket 170, the inner edge of the L-shaped bracket 170 is embossed, A seal plate 140 is provided between the valve housing 110 and the shaft 130, and the seal plate 140 is press-fitted and fixed to the valve housing 110. The valve housing 110 is formed with a plurality of screw coupling grooves 117, at least a portion of the vehicle bypass valve, characterized in that the reinforcement is reinforced. delete delete delete delete delete delete delete delete

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