JP2006161670A - Secondary air supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a secondary air supply device performing accurate and appropriate exhaust gas purification. <P>SOLUTION: At least one first valve 3 controlling supply and stop of secondary air, at least one second valve 4 controlling flow rate of secondary air by varying flow-path area, and at least one third valve 5 preventing reverse flow of exhaust gas are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a secondary air supply apparatus suitable for performing precise and appropriate exhaust gas purification.

  In general, in order to purify the exhaust gas discharged from the combustion chamber, the engine is supplied with secondary air in the exhaust passage, and combustion of the exhaust gas with this secondary air promotes oxidation of the exhaust gas. There is something that was made to purify.

  As a secondary air supply device used for supplying such secondary air, a reed valve that opens a valve using a pressure wave of exhaust gas or a negative pressure of intake air is generally used. The reed valve is connected with an air cut valve for restricting the inflow of secondary air so that excessive secondary air does not flow into the exhaust passage. When such a secondary air supply device is installed in an engine for a motorcycle, examples of the arrangement thereof include, for example, a reed valve and an air cut valve provided separately and arranged in a frame above the engine, There is one in which a valve and an air cut valve are provided integrally and arranged in a frame above the engine (see, for example, Patent Document 1).

  A configuration in which secondary air is directly supplied by an air pump has also been proposed (see, for example, Patent Document 2).

JP 2000-248924 A JP 2004-257360 A

  However, the conventional secondary air supply apparatus has a problem that it is impossible to purify exhaust gas precisely and appropriately.

  That is, in a secondary air supply device having an air cut valve and a reed valve, the reed valve can prevent the backflow of exhaust gas, but the flow rate (supply amount) of the secondary air is not controlled, In addition, when the negative pressure does not occur because the exhaust valve pressure wave or the negative pressure of the intake air, specifically the negative pressure fluctuation in the exhaust passage (exhaust pipe) is used to open the reed valve flow path. When secondary air control is required, the secondary air cannot be controlled, and the secondary air cannot be properly controlled according to the engine operating condition as a whole. There was a problem that exhaust gas could not be purified.

  In addition, in a secondary air supply device that directly supplies secondary air by an air pump, the secondary air can be controlled even when negative pressure of intake air does not occur, but the volume of the passage that communicates the air pump and the valve The valve opening response from the start of the air pump to the opening of the valve is poor, and the secondary air cannot be controlled properly until the pressure of the secondary air reaches a predetermined pressure. That is, there has been a problem that precise and proper exhaust gas purification cannot be performed.

  The present invention has been made in view of this point, and an object of the present invention is to provide a secondary air supply device capable of purifying exhaust gas densely and appropriately.

  In order to achieve the above-mentioned object, the secondary air supply device according to the present invention is characterized in that in the secondary air supply device used for supplying secondary air for purifying the exhaust gas of the engine, the secondary air supply device At least one first valve for controlling supply and stop, at least one second valve for controlling the flow rate of the secondary air by making the flow path area variable, and for preventing backflow of the exhaust gas And at least one third valve.

  It is preferable that the first valve, the second valve, and the third valve are integrally formed, and there are a plurality of the first valve, the second valve, and the third valve, and the first valve, It is preferable that at least one of the second valve and the third valve is further integrally formed.

  Another feature of the secondary air supply device according to the present invention is that in the secondary air supply device used for supplying secondary air by an air pump for purifying the exhaust gas of the engine, the secondary air is kept constant. At least one storable pressure device that can be held by pressure, at least one first valve that controls the supply and stop of the secondary air, and the flow rate of the secondary air is controlled by making the flow area variable. It has at least one second valve and at least one third valve for preventing the exhaust gas from flowing back.

  The first valve, the second valve, and the third valve are preferably integrally formed, and there are a plurality of the pressure-impressor, the first valve, the second valve, and the third valve. It is preferable that at least one of the pressure device, the first valve, the second valve, and the third valve is further integrally formed.

  Furthermore, another secondary air supply apparatus according to the present invention is characterized in that the secondary air is constant in the secondary air supply apparatus used for supplying secondary air by an air pump for purifying engine exhaust gas. At least one animal pressure device that can be held at a pressure of at least one, at least one second valve that controls the flow rate of the secondary air by making the flow path area variable, and at least for preventing a backflow of the exhaust gas And having one third valve.

  It is preferable that the sterilizer, the second valve, and the third valve are integrally formed, and there are a plurality of the sterilizer, the second valve, and the third valve. It is preferable that at least one of the third valve and the third valve is further integrally formed.

  According to the secondary air supply device of the present invention, there are excellent effects such as being able to purify exhaust gas precisely and appropriately according to the operating state of the engine.

  The present invention will be described below with reference to embodiments shown in the drawings.

  1 to 4 show a first embodiment of a secondary air supply apparatus according to the present invention. FIG. 1 is a schematic external view of the main part, and FIG. 2 is a schematic cross-sectional view of the main part of FIG. 3 is a schematic side view of the main part of FIG. 1, and FIG. 4 is a schematic bottom view of the main part of FIG.

  The secondary air supply device 1 of the present embodiment is used for an exhaust passage of an engine. As shown in FIG. 1, the secondary air supply device 1 has two points at the center in the left-right direction in FIG. Two secondary air flow paths 2 (hereinafter referred to as valve flow paths for convenience of explanation) are provided symmetrically in the left-right direction in FIG. 1 about a symmetry line SL indicated by a chain line. That is, the secondary air supply device 1 of this embodiment has two systems of valve flow paths 2 for one exhaust passage. In FIG. 1 and FIG. 2, the two valve flow paths 2 are indicated by a plurality of thick arrows and solid lines connecting these thick arrows. A first valve 3, a second valve 4, and a third valve 5 are provided in each of the two valve flow paths 2 from the secondary air supply side SS shown in the upper part of FIG. They are provided in this order toward the exhaust side ES, which is the gas generation side.

  That is, the secondary air supply device 1 of the present embodiment has the first valve 3 and the second valve 4 in each of the two valve flow paths 2 from the upstream side to the downstream side in the flow direction of the secondary air. And the 3rd valve | bulb 5 is arrange | positioned in this order.

  In the secondary air supply device 1 of the present embodiment, the first valve 3, the second valve 4, and the third valve 5 are integrally formed as one valve unit.

  Further, the second valve 4 of the present embodiment is a second unitized by arranging two second valves 4 symmetrically arranged in one valve case by sharing a valve case described later. The valve unit 6 is used. Of course, a configuration using two second valves 4 may be adopted. However, it is preferable that all the valves are integrated into a valve unit.

  The first valve 3, the second valve unit 6, and the third valve 5 will be described in detail.

  The first valve 3 is for controlling the supply and stop of the secondary air. In this embodiment, the first valve 3 is of an electromagnetic operation type that can quickly switch the supply and stop of the secondary air by electromagnetic operation. A directional control valve, specifically a two-port solenoid valve 7 is used.

  The 2-port solenoid valve 7 will be described by exemplifying the 2-port solenoid valve 7 shown on the left side of FIG.

  As shown in FIG. 2, the two-port solenoid valve 7 of this embodiment has a spool 8 formed in a stepped columnar shape. The spool 8 is arranged along a horizontal direction whose longitudinal direction is shown in the left-right direction in FIG. The spool 8 is slidably disposed along the horizontal direction in an inner hole 9a of a sleeve 9 formed in a cylindrical shape. Further, the sleeve 9 is disposed inside a solenoid valve case 10 as a valve case, and the first port 7P and the sleeve 9 penetrate through both the solenoid valve case 10 and the sleeve 9 from the outer periphery toward the inner hole 9a. Two ports of the second port 7A are formed. The axial centers of the first port 7P and the second port 7A are formed so as to be shifted along the axial direction of the sleeve 9.

  One first port 7P serves as an inlet for secondary air used to supply secondary air to the two-port solenoid valve 7, and the upper end of FIG. 2 is an opening through which external secondary air can be introduced. The lower end of FIG. 2 is a small-diameter opening connected to the inner hole 9a, and is formed above the spool 8 shown in FIG.

  The other second port 7A serves as an outlet used to exhaust the secondary air supplied to the two-port solenoid valve 7. The upper end of FIG. 2 is an opening connected to the inner hole 9a, and the lower end is 2 It is an opening for exhausting the secondary air that has passed through the port solenoid valve 7, and is formed below the spool 8 shown in FIG.

  A solenoid case 11A in which a solenoid 11 is housed is attached to the left end portion of the electromagnetic valve case 10. The solenoid 11 is mainly formed of a fixed iron core, a coil, and a plunger 12 (only a part is shown in the right two-port solenoid valve 7 in FIG. 2). The base end portion of the spool 8 is brought into contact with the tip end portion of the plunger 12 by the biasing force of the biasing spring 13 disposed at the tip end of the spool 8 inside the electromagnetic valve case 10, and the solenoid 11 is driven. By moving the spool 8 along the inner hole 9a by force, the opening and closing of the first flow path 14, which is the flow path of the 2-port electromagnetic valve 7, can be controlled.

  That is, the 2-port solenoid valve 7 is formed with a first flow path 14 that communicates the first port 7P, the inner hole 9a, and the second port 7A in this order. It can be opened and closed by a spool 8 that moves by a driving force.

  For example, when the coil is not energized, the land 8a at the tip of the spool 8 is moved between the first port 7P and the second port 7A by the biasing force of the biasing spring 13. Like the 2-port solenoid valve 7 shown on the left side of FIG. 2, it is formed so as to block the first flow path 14 between the first port 7P and the second port 7A. When the coil is energized, the spool 8 resists the urging force of the urging spring 13 by the magnetic force of the electromagnet, and the land at the tip of the spool 8 becomes like the two-port solenoid valve 7 shown on the right side of FIG. 8a moves forward from the second port 7A (the two-port solenoid valve 7 shown on the left side of FIG. 2 has the right side of FIG. 2 and the two-port solenoid valve 7 shown on the right side of FIG. 2 has the left side of FIG. 2). Like the two-port solenoid valve 7 shown on the right side of FIG. 2, the first flow path 14 between the first port 7P and the second port 7A is opened.

  Note that the first flow path 14 may be opened in a non-energized state of the coil, and the first flow path 14 may be blocked by energizing the coil, as required by the design concept.

  Further, the two-port solenoid valve 7 on the left side in FIG. 2 shows a shut-off state of the first flow path 14 in which the secondary air introduced from the first port 7P is shut off by the spool 8, and the right-hand side in FIG. The two-port solenoid valve 7 shows an open state of the first flow path 14 in which the secondary air introduced from the first port 7P is exhausted from the second port 7A.

  The two-port solenoid valve 7 is electrically connected to a control unit composed of a CPU, a memory, and the like (not shown), and each solenoid 11 of the two two-port solenoid valves 7 is controlled by a control command sent from the control unit. It can be driven independently.

  That is, the opening and closing of the first flow paths 14 of the two two-port solenoid valves 7 can be individually controlled.

  Therefore, the upstream side in the flow direction of the valve flow path 2 shown on the left side of FIG. 1 among the two valve flow paths 2 of the secondary air is the first flow path 14 of the 2-port solenoid valve 7 shown on the left side of FIG. The upstream side in the flow direction of the valve flow path 2 shown on the right side of FIG. 1 is formed by the first flow path 14 of the 2-port electromagnetic valve 7 shown on the right side of FIG.

  Since other configurations are the same as those of a conventionally known two-port solenoid valve, detailed description thereof is omitted.

  The first valve 3 can be selected from various other directional control valves that can quickly switch between supply and stop of secondary air, such as poppet valves, diaphragm valves, rotary valves, and planar slide valves. can do.

  Of course, the operation method is not limited to the electromagnetic operation type using the electromagnetic force, but the pneumatic operation type in which the valve operation is performed by the pneumatic force or the machine operation type in which the air flow direction is switched by the mechanical force is used. May be.

  As described above, the second valve unit 6 is obtained by unitizing the two second valves 4 in a symmetrical arrangement. That is, the second valve unit 6 of the present embodiment is an integrated unit of the second valve 4 shown on the left side of the symmetry line SL and the second valve 4 shown on the right side of the symmetry line SL in FIGS. It is. Therefore, in the secondary air supply device 1 of the present embodiment, the two second valves 4 are further integrally formed.

  The second valve 4 is for controlling the flow rate of the secondary air. In the present embodiment, the opening degree of the valve body with respect to the flow path is controlled by a mechanical force based on the driving force of the servo motor. The flow control valve of the machine operation type which can make the flow path area (passage cross-sectional area) variable, more specifically, the electric throttle valve 15 is used.

  As shown in FIGS. 1 to 4, the second valve unit 6 of the present embodiment is a common fixed plate as a valve case for integrating two electric throttle valves 15 arranged symmetrically in FIG. 1. 16. The shared fixed plate 16 is formed in a horizontally long, substantially rectangular parallelepiped shape shared by the two electric throttle valves 15 and, as shown in FIG. 2, is divided into two in the vertical direction of FIG. 2 is the upper plate 16a, and the other shown in the lower part of FIG. 2 is the lower plate 16b. Further, as shown in FIG. 4, the upper plate 16a has a bowl-like attachment having a substantially semicircular side surface that can be attached so that the lower part of the solenoid valve case 10 of the two-port solenoid valve 7 is in close contact with the upper plate 16a. A concave surface 17 is formed. Then, the mounting plate 18 as a fastening member inserted from the lower surface side of the common fixing plate 16 shown in the lower part of FIG. 2 is used to connect the upper plate 16 a and the lower plate 16 b and the common fixing plate 16 and the two-port solenoid valve 7. Each is attached to one piece. Further, a pair of left and right valve chambers 19 are formed symmetrically between the opposing surfaces of the upper plate 16a and the lower plate 16b.

  In the upper plate 16a, two first ports 15P penetrating the upper plate 16a in the vertical direction are formed symmetrically. Further, two second ports 15A penetrating the lower plate 16b in the vertical direction are formed in the lower plate 16b in a bilaterally symmetrical manner. The first port 15P and the second port 15A are each formed in a substantially rectangular plane having the same size, and are formed so that the first port 15P and the second port 15A overlap in the vertical direction in FIG. Yes.

  One first port 15P serves as an inlet for secondary air that has passed through the two-port electromagnetic valve 7 used for supplying secondary air to the electric throttle valve 15, and the upper end of FIG. The lower port of FIG. 2 is an opening connected to the valve chamber 19. The secondary air exhausted from the second port 15 </ b> A of the two-port solenoid valve 7 can be introduced into the electric throttle valve 15.

  The other second port 15A serves as an outlet used for exhausting the secondary air supplied to the electric throttle valve 15. The upper end of FIG. 2 is an opening connected to the valve chamber 19, and the lower end is an electric throttle. It is an opening for exhausting secondary air that has passed through the valve 15.

  That is, the upper end of the first port 15P of the electric throttle valve 15 shown on the left side of FIG. 2 is connected to the second port 7A of the two-port solenoid valve 7 shown on the left side of FIG. Is connected to the valve chamber 19 of the electric throttle valve 15 shown on the left side of FIG. Further, the upper end of the first port 15P of the electric throttle valve 15 shown on the right side of FIG. 2 is connected to the second port 7A of the two-port solenoid valve 7 shown on the right side of FIG. 2, and the lower end of the first port 15P. Is connected to a valve chamber 19 of an electric throttle valve 15 shown on the right side of FIG. Further, the upper end of the second port 15A of the electric throttle valve 15 shown on the left side of FIG. 2 is connected to the valve chamber 19 of the left side electric throttle valve 15 of FIG. 2, and the electric throttle valve 15 shown on the right side of FIG. The upper end of the second port 15A is connected to the valve chamber 19 of the electric throttle valve 15 shown on the right side of FIG.

  The valve chamber 19 is provided with a flat sliding plate 20 as a valve body. The sliding plate 20 is sandwiched between the upper plate 16a and the lower plate 16b and is slidable in the left-right direction in FIG. 2, and the sliding plate 20 is used when opening the flow path. A planar rectangular plate through hole 20a penetrating in the plate thickness direction is formed. That is, the sliding plate 20 is formed in a horizontally long rectangular frame shape in the left-right direction as a whole.

  In the outer edge of the sliding plate 20, specifically, in the sliding plate 20 shown on the left side of FIG. 2, the central part at the left end, and in the sliding plate 20 shown on the right side in FIG. Each end of the drive rod 21 is connected. The other end of the drive rod 21 is a pin portion 21a bent downward in FIG. The pin portion 21 a is fitted in a support hole 22 a (FIG. 3) formed in the distal end portion of the drive lever 22, and the base end portion of the drive lever 22 is an attachment member (not shown) on the side surface of the common fixing plate 16. It is attached to the output shaft of the servo motor 23 supported via. The sliding plate 20 can be moved in the left-right direction along the valve chamber 19 by rotating the driving lever 22 by the driving force of the servo motor 23. In addition, the opening and closing of the second flow path 24 can be controlled by moving the sliding plate 20 in the left-right direction.

  That is, the electric throttle valve 15 is formed with a second flow path 24 that communicates the first port 15P, the valve chamber 19 and the second port 15A in this order, and the second flow path 24 is connected to the servo motor 23. It can be opened and closed by a sliding plate 20 that is moved by a driving force.

  For example, as shown in FIGS. 2 and 3, when the servo motor 23 is driven and the tip of the drive lever 22 is moved in the direction farthest away from the end of the shared fixing plate 16, the electric diaphragm shown on the left side of FIG. Like the valve 15, the plate through hole 20 a of the sliding plate 20 is separated from the first port 15 P and the second port 15 A, and the sliding plate 20 allows the space between the first port 15 P and the second port 15 A. The second flow path 24 is cut off. Further, when the servo motor 23 is driven and the tip of the drive lever 22 is moved in the direction closest to the end of the common fixing plate 16, the sliding plate 20 is moved like the electric throttle valve 15 shown on the right side of FIG. The plate through hole 20a is located between the first port 15P and the second port 15A, and the sliding plate 20 opens the second flow path 24 between the first port 15P and the second port 15A (fully opened). ). Furthermore, by controlling the drive amount of the servo motor 23, the flow path area can be made variable by the plate through hole 20a of the sliding plate 20.

  The electric throttle valve 15 on the left side of FIG. 2 shows a shut-off state of the second flow path 24 where the secondary air introduced from the first port 15P is shut off by the sliding plate 20, and the right side of FIG. The electric throttle valve 15 shows a fully opened state of the second flow path 24 in which the maximum amount of secondary air introduced from the first port 15P is exhausted from the second port 15A.

  The servo motor 23 of the electric throttle valve 15 is electrically connected to a control unit configured by a CPU, a memory, and the like (not shown), and the servo motor 23 of each electric throttle valve 15 according to a control command sent from the control unit. Can be driven independently, and the drive amount can be controlled.

  That is, the opening and closing of the second flow path 24 and the control of the flow area (valve opening) can be individually performed by the sliding plates 20 of the two electric throttle valves 15.

  Therefore, the middle part of the flow direction of the valve flow path 2 shown on the left side of FIG. 1 among the two flow paths 2 of the secondary air is the second flow path 24 of the electric throttle valve 15 shown on the left side of FIG. The intermediate portion in the flow direction of the valve flow path 2 shown on the right side of FIG. 1 is formed by the second flow path 24 of the electric throttle valve 15 shown on the right side of FIG.

  The other configuration is the same as the configuration of a throttle valve using a conventionally known sliding plate, and a detailed description thereof will be omitted.

  As the second valve 4, other throttle valves that can control the flow rate of the secondary air by making the flow path area variable, such as butterfly valves, rotary valves, needle valves, etc. Selectable can be used.

  Of course, as an operation method, an electromagnetic operation type using an electromagnetic force or a pneumatic operation type in which a valve operation is performed by a pneumatic force may be used.

  The third valve 5 is for preventing the backflow of exhaust gas. In the present embodiment, a reed valve 25 that can shut off the flow path by the pressure of the exhaust gas from the exhaust side ES is used. ing.

  The reed valve 25 will be described with reference to the reed valve 25 shown on the left side of FIG.

  The reed valve 25 has a plate-like support substrate 26 formed in a substantially rectangular plane. A fluid circulation hole 27 penetrating in the thickness direction of a substantially rectangular plane is formed in the substantially central portion of the support substrate 26.

  A lead plate 28 as a valve body formed in a substantially rectangular plane that can be opened and closed according to the pressure of the fluid passing through the flow hole 27 covers the lower surface of the support substrate 26 so as to block the lower end of the flow hole 27. A stopper 29 for restricting the open position of the lead plate 28 is provided on the lower surface side of the lead plate 28. The base end portion located on the left end side of the lead plate 28 and the stopper 29 has the tip of a mounting screw 30 as a fastening member inserted from the lower surface side of the support substrate 26 shown in the lower part of FIG. Both are fixed to the lower surface of the support substrate 26 in a cantilever manner by being screwed into the lower surface of the lower plate 16 b, and the reed valve 25 itself is attached to the second valve unit 6.

  One lead plate 28 is for allowing the fluid to flow from the upper side to the lower side of the flow hole 27 and for preventing the flow in the opposite direction, that is, the reverse flow of the exhaust gas, and is a thin plate-like metal having elasticity. Alternatively, it is formed of a resin or the like.

  That is, when no pressure is applied to the reed valve 25 and when the pressure above the reed valve is lower than the pressure below, the reed plate 28 is formed by the flow hole 27 by closing the lower end of the flow hole 27. It is formed to be able to take a closed position where the three flow paths 31 are blocked. Further, when the pressure above the reed valve 25 is higher than the pressure below the reed valve 25, the reed plate 28 is in contact with the stopper 29 so that the third flow path 31 can be opened.

  The other stopper 29 is formed of a rigid metal or the like, and protrudes toward the support substrate 26 so that the free end located on the right end side swells away from the lower surface of the support substrate 26. It is curved.

  Therefore, the downstream side in the flow direction of the valve flow path 2 shown on the left side in FIG. 1 among the two valve flow paths 2 of the secondary air is formed by the third flow path 31 of the reed valve 25, and the right side in FIG. 1 is formed by a third flow path 31 of the reed valve 25 shown on the right side of FIG.

  The outer peripheral portion of the support substrate 26 is a mounting portion, and a thin film formed of an elastic body such as rubber is provided on the surface of the mounting portion, more specifically on the upper and lower surfaces and the outer peripheral side surface of the outer peripheral portion of the support substrate 26. A first gasket portion is formed.

  On the upper and lower surfaces of the first gasket portion, annular protrusions for preventing the fluid passing through the flow hole 27 from leaking to the outside are formed. Further, a thin film second gasket portion formed of an elastic body such as rubber is formed on the upper and lower surfaces of the central portion connected to the end surface of the flow hole 27 of the support substrate 26 and the inner peripheral surface of the flow hole 27. . The second gasket portion located on the upper surface of the central portion of the support substrate 26 forms a flat rectangular frame-shaped valve seat surrounding the periphery of the flow hole 27 with respect to the lead plate 28 as a valve body.

  The other configuration is the same as the configuration of the conventionally known reed valve 25, and thus detailed description thereof is omitted.

  The third valve 5 is not limited to the reed valve 25 and can be selected from various check valves that can prevent the backflow of exhaust gas.

  In the present embodiment, the two valve flow paths 2 are provided symmetrically in the left-right direction, but the two valve flow paths 2 may be provided symmetrically or opposite to each other in the direction perpendicular to the sheet of FIG. Good. Of course, the first valve 3, the second valve 4, and the third valve 5 may each be one so that the valve flow path 2 is one system according to the design concept or the like.

  Further, in the present embodiment, the first valve 3, the second valve 4, and the third valve 5 are integrally formed. However, the first valve 3, the second valve 4 may be used as necessary according to the design concept. In addition, at least one of the third valves 5 may be disposed separately. However, when separated, the degree of freedom of design with respect to the arrangement positions of the valves in the exhaust system of the engine is improved, but connection piping for connecting the separated portions is necessary.

  In addition, since each component is arrange | positioned left-right symmetrically centering | focusing on the symmetry line SL, the code | symbol is attached | subjected only to the principal part on the right side of the symmetry line SL in FIGS.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  According to the electromagnetic valve as the first valve 3 of the secondary air supply device 1 of this embodiment, the spool 8 is moved in the left-right direction by the driving force of the solenoid 11 so that the two-port electromagnetic valve 7 on the left side in FIG. As shown in FIG. 2, the closed position for blocking the first flow path 14 between the first port 15P and the second port 15A, and the first port 15P as shown in the right two-port solenoid valve 7 in FIG. Since it is possible to selectively take two positions, that is, the open position where the first flow path 14 between the second port 15A and the second port 15A is opened, the supply and stop of the secondary air can be quickly switched. As a result, excessive supply of secondary air can be prevented.

  In addition, according to the electric throttle valve 15 as the second valve 4 of the secondary air supply device 1 of the present embodiment, the sliding plate 20 is moved in the left-right direction by the driving force of the servo motor 23, so that FIG. As shown in the left electric throttle valve 15, as shown in the closed position where the second flow path 24 between the first port 15P and the second port 15A is blocked, and as shown in the right electric throttle valve 15 in FIG. By selectively taking two positions, the fully open position that fully opens the second flow path 24 between the first port 15P and the second port 15A, and controlling the drive amount of the servo motor 23, Since an arbitrary position between the closed position and the open position can be taken, the flow area of the second flow path 24 can be made variable, and the flow rate of the secondary air passing through the second flow path 24 is controlled. Can do. As a result, it is possible to supply the secondary air and control the flow rate even when no negative pressure is generated on the exhaust side ES.

  Furthermore, according to the reed valve 25 as the third valve 5 of the secondary air supply device 1 of the present embodiment, the reed valve 25 is located above (upstream of the secondary air) and below (downstream of the secondary air). 2, when no pressure is applied to the reed valve 25 and when the pressure above the reed valve 25 is lower than the pressure below, the reed plate 28 circulates. As shown in the reed valve 25 on the right side of FIG. 2 and the closed position where the hole 27 is closed to block the third flow path 31, the lead plate 28 when the pressure above the reed valve 25 is higher than the pressure below is shown. Since two positions can be selectively taken, that is, an open position where the third flow path 31 in which the flow hole 27 is opened in contact with the stopper 29 is opened, only in one direction from the upper side to the lower side of the flow hole 27. Allow secondary air flow in the opposite direction It is possible to prevent the reverse flow of a flowing exhaust gas.

  Further, according to the secondary air supply device 1 of the present embodiment, the solenoid 11 of the two-port solenoid valve 7 and the servo motor 23 of the electric throttle valve 15 are controlled based on a control command sent from the control unit. Therefore, for example, the control unit detects the operating state of the engine based on detection signals sent from various sensors such as an air fuel consumption sensor, a slot opening sensor, and a drive shaft rotation sensor. Depending on the state, the opening and closing of the first flow path 14 of the secondary air supply device 1, the opening and closing of the second flow path 24, and the opening of the valve can be controlled. As a result, precise and appropriate exhaust gas purification can be easily and reliably performed according to the operating state of the engine.

  Thus, according to the secondary air supply device 1 of the present embodiment, the flow rate of the secondary valve can be changed by changing the flow rate of the first valve 3 that controls the supply and stop of the secondary air. Since the second valve 4 to be controlled and the third valve 5 for preventing the backflow of the exhaust gas are provided, precise and proper purification of the exhaust gas can be performed easily and reliably.

  Further, according to the secondary air supply device 1 of the present embodiment, since the first valve 3, the second valve 4 and the third valve 5 are integrally formed, the mounting space can be reduced, and each Since the distance between the valves can be shortened, the valve opening response of the lead plate 28 can be improved, and the responsiveness of each valve to changes in the operating state of the engine can be improved.

  Further, according to the secondary air supply device 1 of the present embodiment, two each of the first valve 3, the second valve 4 and the third valve 5 are provided, so that two independent valve flow paths 2 are provided. It can be. And by making the independent valve flow path 2 into 2 systems, it controls by closing one valve flow path 2 and opening the other valve flow path 2, and the conventional secondary air supply apparatus It is possible to purify the exhaust gas properly in the intermediate rotation region of the engine, which is impossible in Further, by providing two valve flow paths 2, in a rotation region where a sharp exhaust gas purification is required, by performing control to open the two valve flow paths 2 together, a more agile exhaust gas. It is possible to use it to purify it.

  Further, according to the secondary air supply device 1 of the present embodiment, the independent valve flow paths 2 can be made into two systems, so that any one of the valves constituting the valve flow path 2 has a failure. Even so, since the exhaust gas can be purified by the valve passage 2 of the other system, the reliability can be improved.

  Further, according to the secondary air supply device 1 of the present embodiment, the two second valves 4 out of the two first valves 3, the two second valves 4, and the two third valves 5 are further integrated. Since the second valve unit 6 is formed, the number of parts can be reduced, and the labor and time required for manufacturing can be reduced. As a result, productivity can be improved.

  Furthermore, the reduction in the number of parts in the secondary air supply device 1 of the present embodiment can be used for a small engine that cannot secure a large mounting space because the assembly can be made small.

  Therefore, according to the secondary air supply apparatus 1 of this embodiment, cost reduction and size reduction can be achieved easily.

  In addition, according to the secondary air supply device 1 of the present embodiment, the single second valve 4 can be easily formed by dividing the shared fixed plate 16 along the symmetry line SL indicated by the two-dot chain line in FIG. Therefore, it is possible to easily share parts with the secondary air supply device 1 having a configuration in which each of the first valve 3, the second valve 4, and the third valve 5 is one.

  5 and 6 show a second embodiment of the secondary air supply device 1 according to the present invention. FIG. 5 is a schematic cross-sectional view of the main part, and FIG. 6 is a schematic side view of FIG. is there. In addition, the same code | symbol is attached | subjected in drawing about the structure which is the same thru | or equivalent to the secondary air supply apparatus 1 of 1st Embodiment mentioned above.

  A secondary air supply device 1A of the present embodiment is a modification of the second valve unit 6 in the secondary air supply device 1 of the first embodiment described above.

  That is, the second valve unit 6A of the secondary air supply device 1A of the present embodiment has two electric butterfly valves 32 that can be rotated by a servo motor 23A as the second valve 4, as shown in FIGS. Are provided integrally.

  More specifically, the second valve unit 6A of this embodiment has a main body case 33 as a valve case for integrating two electric butterfly valves 32 arranged symmetrically in FIG. The main body case 33 is formed in a horizontally long substantially rectangular parallelepiped shape shared by the two electric butterfly valves 32. As shown in FIG. 5, the main body case 33 is divided into two parts in the vertical direction of FIG. Furthermore, one shown in the upper part of FIG. 5 is an upper case 33a, and the other shown in the lower part of FIG. 5 is a lower case 33b. Further, as shown in FIG. 6, the upper case 33a has a bowl-like attachment having a substantially semicircular side surface that can be attached so that the lower part of the electromagnetic valve case 10 of the two-port electromagnetic valve 7 is in close contact with the upper case 33a. A concave surface 34 is formed.

  The main body case 33 is formed with a substantially circular case through hole 36 for forming the pair of left and right second flow paths 35 so as to penetrate the main body case 33 in the vertical direction. These case through holes 36 are formed symmetrically about the symmetry line SL. The first port 32P is formed by the opening at the upper end of the case through hole 36, and the second port 32A is formed by the opening at the lower end.

  As shown in FIG. 5, a substantially disc-shaped disk 37 is disposed in each of the second flow paths 35, and the driving force of a pair of left and right servomotors 23 </ b> A attached to the side surface of the main body case 33. By rotating the disk 37, the opening and closing of the second flow path 35 and the flow path area can be controlled.

  For example, like the electric butterfly valve 32 shown on the left side of FIG. 5, the servo motor 23A is driven so that the thickness direction of the disk 37 is the vertical direction of FIG. The second flow path 35 is formed so as to be in sliding contact with a seat ring (not shown) disposed on the inner surface and blocked by the disk 37. Further, like the electric butterfly valve 32 shown on the right side of FIG. 5, the servo motor 23A is driven and the thickness direction of the disk 37 is set to the left and right direction of FIG. In addition to being separated from the inner surface of 36, the area occupied by the disk 37 with respect to the second flow path 35 is minimized, and the second flow path 35 can be opened (fully opened). Further, by controlling the drive amount of the servo motor 23A, the valve opening degree by the disk 37, that is, the flow passage area of the second flow passage 35 can be made variable.

  The electric butterfly valve 32 on the left side of FIG. 5 shows a state where the second flow path 35 where the secondary air introduced from the first port 32P is blocked by the disk 37 is shown in FIG. The butterfly valve 32 shows a fully opened state of the second flow path 35 in which the maximum amount of secondary air introduced from the first port 32P is exhausted from the second port 32A.

  The servo motor 23A is electrically connected to a control unit including a CPU, a memory, and the like (not shown), and independently drives the servo motor 23A of each electric butterfly valve 32 according to a control command sent from the control unit. The driving amount can be controlled.

  That is, the opening and closing of the second flow path 35 and the control of the flow path area (valve opening degree) by the respective disks 37 of the two electric butterfly valves 32 can be performed individually.

  Since other configurations are the same as those of the secondary air supply device 1 of the first embodiment described above, detailed description thereof is omitted.

  According to the secondary air supply device 1A of the present embodiment having such a configuration, the same effects as the secondary air supply device 1 of the first embodiment described above can be achieved.

  7 and 8 show a third embodiment of the secondary air supply device 1 according to the present invention. FIG. 7 is a schematic cross-sectional view of the main part, and FIG. 8 is a schematic side view of FIG. is there. In addition, the same code | symbol is attached | subjected in drawing about the structure which is the same as that of the secondary air supply apparatus of 1st Embodiment mentioned above, or corresponds.

  The secondary air supply device 1B of this embodiment shows another modification of the second valve unit 6 in the secondary air supply device 1 of the first embodiment described above.

  That is, the second valve unit 6B of the secondary air supply device 1B of the present embodiment has two electric rotary valves 38 that can be rotated by a servo motor 23B as the second valve 4, as shown in FIGS. Are provided integrally.

  More specifically, the second valve unit 6B of the present embodiment has a body 39 as a valve case for integrating two electric rotary valves 38 arranged symmetrically in FIG. The body 39 is formed in a horizontally long substantially rectangular parallelepiped shape shared by the two electric rotary valves 38. Then, on the upper surface of the body 39, as shown in FIG. 8, a saddle-like mounting concave surface having a substantially semicircular side surface that can be attached so that the lower part of the electromagnetic valve case 10 of the two-port electromagnetic valve 7 is in close contact with it. 40 is formed.

  As shown in FIG. 7, the body 39 is formed with body through holes 42 for forming a pair of left and right second flow paths 41 so as to penetrate the body 39 in the vertical direction. These body through holes 42 are formed symmetrically about the symmetry line SL. The first port 38P is formed by the opening at the upper end of the body through hole 42, and the second port 38A is formed by the opening at the lower end.

  Each of the second flow paths 41 is provided with a rotor 44 as a valve body having a passage 43 having the same size as the body through hole 42, and a pair of left and right servomotors attached to the side surface of the body 39. By rotating the rotor 44 with the driving force of 23B, the opening and closing of the second flow path 41 and the flow path area can be controlled.

  For example, like the electric rotary valve 38 shown on the left side of FIG. 7, the servo motor 23 </ b> B is driven so that the passage 43 of the rotor 44 is in the left-right direction of FIG. The second flow path 41 can be blocked by the rotor 44 in sliding contact with a stator (not shown) disposed on the rotor. Further, like the electric rotary valve 38 shown on the left side of FIG. 7, the servo motor 23 </ b> B is driven and the passage 43 of the rotor 44 is set in the vertical direction of FIG. The second channel 41 is formed so as to be open (fully open). Further, by controlling the drive amount of the servo motor 23B, the valve opening degree by the passage 43 of the rotor 44, that is, the flow passage area of the second flow passage 41 can be made variable.

  The left side electric rotary valve 38 in FIG. 7 shows a shut-off state of the second flow path 43 in which the secondary air introduced from the first port 38P is blocked by the rotor 44, and the right side electric rotary valve 38 in FIG. The rotary valve 38 shows a fully opened state of the second flow path 41 in which the maximum amount of secondary air introduced from the first port 38P is exhausted from the second port 38A through the passage 43 of the rotor 44.

  The servo motor 23B is electrically connected to a control unit composed of a CPU, a memory, etc. (not shown), and independently drives the servo motor 23B of each electric rotary valve 38 by a control command sent from the control unit. The driving amount can be controlled.

  That is, the opening and closing of the second flow path 41 and the control of the flow area (valve opening) can be individually performed by the rotors 44 of the two electric rotary valves 38.

  Since other configurations are the same as those of the secondary air supply device 1 of the first embodiment described above, detailed description thereof is omitted.

  According to the secondary air supply device 1B of the present embodiment having such a configuration, the same effects as those of the secondary air supply device 1 of the first embodiment described above can be achieved.

  FIG. 9 is a schematic cross-sectional view showing a main part of a fourth embodiment of the secondary air supply device according to the present invention. In addition, the same code | symbol is attached | subjected in drawing about the structure which is the same as that of the secondary air supply apparatus of 1st Embodiment mentioned above, or corresponds.

  The secondary air supply device 1 </ b> C of this embodiment is an example of an embodiment that is used for supplying secondary air by an air pump for purifying exhaust gas of an engine.

  The secondary air supply device 1C of the present embodiment is obtained by adding an accumulator as a livestock pressure device to the secondary air supply device 1 of the first embodiment described above.

  That is, as shown in FIG. 9, the secondary air supply device 1C of the present embodiment is similar to the secondary air supply device 1 of the first embodiment described above. From the upstream side to the downstream side in the flow direction of the secondary air, the first valve 3 formed by the accumulator 51 and the two-port solenoid valve 7 serving as the animal pressure device, and the integrated second valve that unitizes the two electric throttle valves 15. The second valve 4 formed by the valve unit 6 and the third valve 5 formed by the reed valve 25 are connected to the exhaust gas shown in the lower part of FIG. 9 from the secondary air supply side SS by the air pump shown in the upper part of FIG. They are provided in this order toward the exhaust side ES which is the generation side.

  The accumulator 51 is configured as an accumulator unit 53 that is unitized by disposing two accumulators 51 arranged symmetrically by sharing a main body case 52 described later in one main body case 52.

  The accumulator 51 is for accumulating pressure when the load is small and releasing it when the load is large to supplement the energy. In the present embodiment, the accumulator 51 determines the pressure of the secondary air supplied to the first valve 3 to a predetermined value. The value of can be held.

  The accumulator unit 53 of this embodiment is a unit in which two accumulators 51 are arranged in a symmetrical arrangement. That is, the accumulator unit 53 of this embodiment is an integrated unit of the accumulator 51 shown on the left side of the symmetry line SL and the accumulator 51 shown on the right side of the symmetry line SL.

  Therefore, in the secondary air supply device 1 of the present embodiment, two accumulators 51, first valves 3, second valves 4, and third valves 5 are provided, and two accumulators 51, Each of the two electric throttle valves 15 as the two valves 4 is further integrally formed. Of course, each of the accumulator 51 and the second valve 4 may be used for each of the two valve flow paths 2C.

  The accumulator unit 53 has a cylindrical main body case 52, and the inside of the accumulator unit 53 is an air chamber 54 capable of storing secondary air of a predetermined pressure. In addition, supply ports 53P each having an opening through which secondary air can be introduced are formed at both ends of the main body case 52. These supply ports 53P are used for adjusting the pressure of the secondary air. The secondary port portion 55A of the regulator 55 is connected. Further, an output port 53A penetrating the main body case 52 inward and outward is formed symmetrically about the symmetry line SL at the lower part of the outer peripheral surface of the main body case 52, and each of these output ports 53A is connected to each other. One end of the pipe 56 is connected. The other end of the connection pipe 56 is connected to the first port 7P of each first valve 3 in each of the two systems of valve flow paths 2C.

  In other words, the accumulator unit 53 is connected to the supply port 53P and the output port 53A by the air chamber 54, whereby the accumulator unit 53 is connected to the supply port 53P, the air chamber 54 and the output port 53A in this order. A flow path 57 is formed.

  Accordingly, in the secondary air supply device 1C of the present embodiment, the secondary air valve flow path 2C moves from the upstream side in the flow direction toward the downstream side, the accumulator flow path 57, the flow path of the connection pipe 56, the first The channel 14, the second channel 24 and the third channel 31 are formed.

  In addition, as the accumulator unit 53, it can also be set as the structure which provides the partition which isolate | separates the right-and-left part inside the main body case 52 in the position of the symmetry line SL.

  The size of each part such as the volume of the air chamber 54 of the accumulator unit 53 may be set according to the design concept or the like.

  The regulator 55 is used for adjusting the pressure of secondary air from an air pump (not shown), and is usually a spring type valve system, for example, a valve that detects the pressure on the secondary side of the fluid by a diaphragm. What opens and closes is used. The primary side port portion 55P of the regulator 55 is formed so as to be able to supply secondary air sent by an air pump.

  Since the first valve 3, the second valve 4, and the third valve 5 are formed in the same manner as the secondary air supply device 1 of the first embodiment described above, detailed description thereof is omitted. Of course, the first valve 3, the second valve 4, and the third valve 5 can be selected from various types as in the secondary air supply device 1 of the first embodiment described above.

  In this embodiment, the two valve flow paths 2C are provided symmetrically in the left-right direction. However, the two valve flow paths 2C may be provided symmetrically or opposite to each other in the direction perpendicular to the sheet of FIG. Good. Needless to say, the accumulator 51, the first valve 3, the second valve 4, and the third valve 5 may each be one so that the valve flow path 2 </ b> C is one system, depending on the design concept and the like.

  Further, in the present embodiment, the first valve 3, the second valve 4, and the third valve 5 are integrally formed. However, the first valve 3, the second valve 4 may be used as necessary according to the design concept. In addition, at least one of the third valves 5 may be disposed separately. However, when separated, the degree of freedom of design with respect to the arrangement positions of the valves in the exhaust system of the engine is improved, but connection piping for connecting the separated portions is necessary.

  Since other configurations are the same as the configuration of the secondary air supply device 1 of the first embodiment described above, detailed description thereof is omitted.

  In addition, since each component is arrange | positioned left-right symmetrically centering | focusing on symmetrical line SL, the code | symbol is attached | subjected only to the principal part on the right side of symmetrical line SL in FIG.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  According to the accumulator 51 of the secondary air supply device 1 </ b> C of the present embodiment, secondary air having a predetermined pressure can be held in the air chamber 54 even when the air pump is stopped. Regardless of the volume of the passage, secondary air having a predetermined pressure can be instantaneously supplied to the first valve 3.

  When the air pump is stopped, the regulator 55 can prevent the secondary air in the air chamber 54 from flowing back to the air pump side, and the first valve 14 is blocked by the first valve or the second valve. The secondary air in the air chamber 54 is prevented from flowing to the exhaust side ES by at least one of the blocking of the second flow path 24 by the above, so that the secondary air of a predetermined pressure can be held in the air chamber 54. It has become.

  According to the electromagnetic valve as the first valve 3 of the secondary air supply device 1C of this embodiment, the spool 8 is moved in the left-right direction by the driving force of the solenoid 11, thereby the two-port electromagnetic valve 7 on the left side in FIG. As shown in the closed position where the first flow path 14 between the first port 15P and the second port 15A is blocked, and as shown in the two-port solenoid valve 7 on the right side of FIG. Since it is possible to selectively take two positions, that is, the open position where the first flow path 14 between the second port 15A and the second port 15A is opened, the supply and stop of the secondary air can be quickly switched. As a result, excessive supply of secondary air can be prevented.

  Further, according to the electric throttle valve 15 as the second valve 4 of the secondary air supply device 1C of the present embodiment, the sliding plate 20 is moved in the left-right direction by the driving force of the servo motor 23, so that FIG. As shown in the left electric throttle valve 15, as shown in the closed position where the second flow path 24 between the first port 15P and the second port 15A is blocked, and as shown in the right electric throttle valve 15 in FIG. By selectively taking two positions, the fully open position that fully opens the second flow path 24 between the first port 15P and the second port 15A, and controlling the drive amount of the servo motor 23, Since an arbitrary position between the closed position and the open position can be taken, the flow area of the second flow path 24 can be made variable, and the flow rate of the secondary air passing through the second flow path 24 is controlled. Can do. As a result, the supply of secondary air and the flow rate can be controlled.

  Furthermore, according to the reed valve 25 as the third valve 5 of the secondary air supply device 1C of the present embodiment, the reed valve 25 is located above (upstream side of the secondary air) and below (downstream side of the secondary air). As shown in the reed valve 25 on the left side of FIG. 9, the reed plate 28 flows when no pressure is applied to the reed valve 25 and when the pressure above the reed valve 25 is lower than the pressure below. As shown in the reed valve 25 on the right side of FIG. 9 and the closed position where the hole 27 is closed to block the third flow path 31, the lead plate 28 in the case where the pressure above the reed valve 25 is higher than the pressure below. Since two positions can be selectively taken, that is, an open position where the third flow path 31 in which the flow hole 27 is opened in contact with the stopper 29 is opened, only in one direction from the upper side to the lower side of the flow hole 27. Allow secondary air flow in the opposite direction It can be a flow blocking the backflow of exhaust gas.

  Further, according to the secondary air supply device 1C of the present embodiment, the solenoid 11 of the two-port solenoid valve 7 and the servo motor 23 of the electric throttle valve 15 are controlled based on a control command sent from the control unit. Therefore, for example, the control unit detects the operating state of the engine based on detection signals sent from various sensors such as an air fuel consumption sensor, a slot opening sensor, and a drive shaft rotation sensor. Depending on the state, the opening and closing of the first flow path 14 of the secondary air supply device 1C, the opening and closing of the second flow path 24, and the opening of the valve can be independently controlled regardless of the driving of the air pump.

  Therefore, according to the secondary air supply device 1C of the present embodiment, the accumulator 51 that can hold the secondary air at a constant pressure, the first valve 3 that controls the supply and stop of the secondary air, the secondary air Since it has the 2nd valve 4 which controls the flow volume of air by making a flow-path area variable, and the 3rd valve 5 for preventing the back flow of exhaust gas, secondary air is supplied with an air pump Even in this case, precise and appropriate purification of exhaust gas can be performed easily and reliably.

  Further, according to the secondary air supply device 1C of the present embodiment, the first valve 3, the second valve 4, and the third valve 5 are integrally formed, so that the mounting space can be reduced, and the first Since the distances between the first valve 3, the second valve 4, and the third valve 5 can be shortened, the valve opening response of the lead plate 28 can be improved, and the first valve 3 with respect to changes in the operating state of the engine, The responsiveness of the second valve 4 and the third valve 5 can be improved.

  Further, according to the secondary air supply device 1C of the present embodiment, since each of the accumulator 51, the first valve 3, the second valve 4, and the third valve 5 is provided, the independent valve flow path 2C is provided. Can be two systems. And by making the independent valve flow path 2C into two systems, the control is performed by closing one valve flow path 2C and opening the other valve flow path 2C. It is possible to purify the exhaust gas properly in the intermediate rotation region of the engine, which is impossible in Further, by providing two valve flow paths 2C, in a rotational range where a rapid exhaust gas purification is required, control is performed to open both of the two valve flow paths 2C, thereby providing a more agile exhaust gas. It is possible to use it to purify it.

  Further, according to the secondary air supply device 1C of the present embodiment, two independent valve flow paths 2C can be provided, so that any one of the valves constituting the valve flow path 2C of one system fails. Even so, since the exhaust gas can be purified by the valve passage 2C of the other system, the reliability can be improved.

  Further, according to the secondary air supply device 1C of the present embodiment, the two accumulators 51 out of the two accumulators 51, the two first valves 3, the two second valves 4, and the two third valves 5 and Since the two second valves 4 are further formed as an accumulator unit 53 and a second valve unit 6 that are integrally formed, the number of parts can be reduced, and the labor and time required for manufacturing can be reduced. As a result, productivity can be improved.

  Furthermore, the reduction in the number of parts in the secondary air supply device 1C of the present embodiment can be used for a small engine that cannot secure a large mounting space because the assembly can be made small.

  Therefore, according to the secondary air supply device 1C of the present embodiment, cost reduction and size reduction can be easily achieved.

  In addition, according to the secondary air supply device 1C of the present embodiment, the accumulator unit 53 is configured such that a partition wall is provided inside the main body case 52 of the accumulator unit 53 to divide the air chamber 54 into left and right at the position of the symmetry line SL. Since the main body case 52 and the shared fixing plate 16 of the second valve unit 6 are divided along the symmetry line SL, the single accumulator 51 and the second valve 4 can be easily obtained. In addition, it is possible to easily share parts with the secondary air supply device 1C having a configuration in which the first valve 3, the second valve 4, and the third valve 5 are each one.

  FIG. 10 is a schematic cross-sectional view showing a main part of a fifth embodiment of the secondary air supply device according to the present invention. In addition, the same code | symbol is attached | subjected in drawing about the structure which is the same as that of the secondary air supply apparatus of 4th Embodiment mentioned above, or corresponds.

  The secondary air supply device 1D of the present embodiment is intended to reduce the size and cost of the secondary air supply device 1C of the fourth embodiment described above.

  That is, as shown in FIG. 10, the secondary air supply device 1D of the present embodiment removes the first valve 3 formed by the two-port solenoid valve 7 from the secondary air supply device 1C of the fourth embodiment described above. In addition, the accumulator unit 53 is integrated with the second valve unit 6.

  Therefore, the secondary air supply device 1D of this embodiment has two systems of valve flow paths 2D for one exhaust passage, and each valve flow path 2D extends from the upstream side to the downstream side in the flow direction. The accumulator channel 57, the second channel 24, and the third channel 31 are formed.

  Further, in order to integrate the accumulator unit 53 with the second valve unit 6, an output port 53 </ b> A formed in the main body case 52 of the accumulator unit 53 is formed on the shared fixing plate 16 of the second valve unit 6. It is fitted inside the 1 port 15P.

  Furthermore, the accumulator unit 53 and the second valve unit 6 are integrally attached by a mounting screw 18 as a fastening member inserted from the lower surface side of the common fixing plate 16 shown below in FIG.

  The other configuration is the same as the configuration of the secondary air supply device 1C of the fourth embodiment described above, and a detailed description thereof will be omitted.

  In addition, since each component is arrange | positioned left-right symmetrically centering | focusing on the symmetrical line SL, the code | symbol is attached | subjected only to the principal part on the right side of the symmetrical line SL in FIG.

  According to the secondary air supply device 1D of the present embodiment having such a configuration, the same effect as that of the secondary air supply device 1C of the fourth embodiment described above can be obtained, and the second air supply device 1D of the fourth embodiment can be achieved. Since the function of the first valve 3 for preventing the excessive supply of the secondary air can be replaced by the air pump, the number of parts can be reduced by simplifying the configuration in the configuration in which the secondary air is supplied by the air pump. Reduction in manufacturing labor and time required for reduction, improvement in productivity due to reduction in labor and time required for manufacturing, and reduction in the number of parts can reduce the size of the assembly, so large installation It can be used for small engines where space cannot be secured.

  Therefore, according to the secondary air supply device 1D of the present embodiment, precise and appropriate exhaust gas purification can be performed easily and reliably, and the size and cost of the configuration in which the secondary air is supplied by the air pump can be reduced. Can be easily achieved.

  In addition, this invention is not limited to each embodiment mentioned above, A various change is possible as needed.

The typical external view which shows the principal part of 1st Embodiment of the secondary air supply apparatus which concerns on this invention. Schematic cross-sectional view of the main part of FIG. Schematic side view of the main part of FIG. Schematic bottom view of the main part of FIG. Typical sectional drawing which shows the principal part of 2nd Embodiment of the secondary air supply apparatus which concerns on this invention. Schematic side view of the main part of FIG. Typical sectional drawing which shows the principal part of 3rd Embodiment of the secondary air supply apparatus which concerns on this invention. Schematic side view of the main part of FIG. Typical sectional drawing which shows the principal part of 4th Embodiment of the secondary air supply apparatus which concerns on this invention. Typical sectional drawing which shows the principal part of 5th Embodiment of the secondary air supply apparatus which concerns on this invention.

Explanation of symbols

1, 1A, 1B, 1C, 1D Secondary air supply device 2, 2C, 2D Valve flow path 3 First valve 4, 4A, 4B Second valve 5 Third valve 6, 6A, 6B Second valve unit 7 2 port Solenoid valve 8 Spool 10 Solenoid valve case 11 Solenoid 14 First flow path 15 Electric throttle valve 20 Sliding plate 23, 23A, 23B Servo motor 24, 35, 41 Second flow path 25 Reed valve 26 Support substrate 27 Flow hole 28 Lead Plate 29 Stopper 31 Third flow path 32 Electric butterfly valve 37 Disc 33 Main body case 52
38 Electric rotary valve 39 Body 44 Rotor 45 Passage 51 Accumulator 52 Body case 53 Accumulator unit 54 Air chamber 55 Regulator 56 Connection pipe 57 Accumulator flow path SL Symmetry line SS Supply side ES Exhaust side

Claims (9)

In a secondary air supply device used for supplying secondary air for purification of engine exhaust gas,
At least one first valve for controlling supply and stop of the secondary air, at least one second valve for controlling the flow rate of the secondary air by changing a flow passage area, and the exhaust gas A secondary air supply device comprising at least one third valve for preventing backflow.   The secondary air supply device according to claim 1, wherein the first valve, the second valve, and the third valve are integrally formed.   There are a plurality of the first valve, the second valve, and the third valve, and at least one of these first valve, second valve, and third valve is further integrally formed. The secondary air supply device according to claim 2. In a secondary air supply device used for supplying secondary air by an air pump for purifying engine exhaust gas,
At least one storable pressure device capable of holding the secondary air at a constant pressure, at least one first valve for controlling supply and stop of the secondary air, and a flow area of the flow rate of the secondary air. A secondary air supply device comprising: at least one second valve controlled by being variable; and at least one third valve for preventing the exhaust gas from flowing backward.   The secondary air supply device according to claim 4, wherein the first valve, the second valve, and the third valve are integrally formed.   There are a plurality of each of the animal pressure device, the first valve, the second valve, and the third valve, and at least any one of these animal pressure devices, the first valve, the second valve, and the third valve is further provided. The secondary air supply device according to claim 5, wherein the secondary air supply device is integrally formed. In a secondary air supply device used for supplying secondary air by an air pump for purifying engine exhaust gas,
At least one animal pressure device capable of holding the secondary air at a constant pressure; at least one second valve for controlling the flow rate of the secondary air by changing the flow passage area; and the backflow of the exhaust gas A secondary air supply device comprising: at least one third valve for preventing the above-described problem.   The secondary air supply device according to claim 7, wherein the animal pressure device, the second valve, and the third valve are integrally formed.   There are a plurality of the animal pressure devices, the second valve, and the third valve, and at least any one of these animal pressure devices, the second valve, and the third valve is further integrally formed. The secondary air supply device according to claim 8, wherein

Images