JP2019183713A - Evaporation fuel treatment device - Google Patents

Abstract

To more easily attach a rectifier to a purge pipe.SOLUTION: An evaporation fuel treatment device comprises a canister into which evaporation fuel generated in a fuel tank is introduced. An atmospheric air introduction pipe for introducing atmospheric air is connected to the canister. The canister is connected to an intake pipe via a purge pipe. A purge valve is attached to the purge pipe. A rectifier 70 is attached between a connecting point of an outlet part of the purge valve and the purge pipe, and a connecting point of the purge pipe and the intake pipe. Multiple rectification chambers 71a are defined at a substantially-columnar main body part 71 of the rectifier 70. A substantially-cylindrical upstream-side cylindrical part 72 is protruded from an end face of the main body part 71 at an upstream side in an axial line direction. A substantially-cylindrical downstream-side cylindrical part 73 is protruded from an end face of the main body part 71 at a downstream side in the axial line direction. The main body part 71, the upstream-side cylindrical part 72 and the downstream-side cylindrical part 73 of the rectifier 70 are inserted into the purge pipe.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fuel vapor processing apparatus.

  The evaporative fuel processing apparatus of Patent Document 1 includes a canister into which evaporative fuel generated in a fuel tank of an internal combustion engine is introduced. The canister adsorbs the evaporated fuel generated in the fuel tank. The canister is connected to an outside air introduction pipe for introducing outside air into the canister. The canister is connected to a portion of the intake pipe downstream of the throttle valve via a purge pipe. A purge valve for switching the flow path of the purge pipe to either one of an open state and a closed state is attached to the purge pipe.

  In the evaporated fuel processing apparatus of Patent Document 1, when the purge pipe flow path is closed by the purge valve, the evaporated fuel generated in the fuel tank flows into the canister and is adsorbed inside the canister. On the other hand, when the flow path of the purge pipe is opened by the purge valve, the outside air flows into the canister through the outside air introduction pipe due to the negative pressure in the intake pipe. Then, the evaporated fuel and the outside air adsorbed inside the canister flow into the intake pipe through the purge pipe.

JP2013-241855A

  In the evaporated fuel processing apparatus of Patent Document 1, when evaporated fuel and outside air flow into the intake pipe via the purge pipe, the pressure difference between the upstream portion of the purge valve and the downstream side of the purge valve becomes large. Then, the gas flow rate increases on the downstream side of the purge valve. When the gas flow velocity is increased in this way, a gas vortex is generated near the outlet of the purge valve, and an air flow noise may be generated by the vortex. Therefore, in the evaporative fuel treatment apparatus of Patent Document 1, it is conceivable to arrange a rectifier in the middle of the purge pipe in order to suppress the generation of gas vortex. However, depending on the configuration of the rectifier, it may take time to attach the rectifier to the purge pipe. Therefore, it is required that the rectifier can be easily attached to the purge pipe.

  An evaporative fuel processing apparatus for solving the above problems includes a canister that introduces evaporative fuel generated in a fuel tank and adsorbs the evaporative fuel, and an outside air introduction pipe that is connected to the canister and introduces outside air into the canister. And a purge pipe that connects the canister and a portion of the intake pipe downstream of the throttle valve, and a purge valve that is provided in the purge pipe and switches the flow path of the purge pipe to one of an open state and a closed state An evaporative fuel processing apparatus comprising: a rectifier provided between a connection portion between the outlet portion of the purge valve and the purge pipe and a connection portion between the purge pipe and the intake pipe; The rectifier includes a column-shaped main body section in which a plurality of rectifying chambers are partitioned, and a tube protruding in the gas flow direction from an end surface in the axial direction of the main body section. And a Jo of the cylindrical portion, at least the cylindrical portion of the rectifier is inserted into the purge tube.

  In the above configuration, the cylindrical portion of the rectifier has a cylindrical shape, and there is no wall portion for partitioning the rectifying chamber inside like the main body portion. Therefore, the cylindrical portion is easily deformed so as to bend in the radial direction as compared with the main body portion. Therefore, when the cylindrical portion of the rectifier is inserted into the purge pipe, the cylindrical section is deformed so as to bend radially inward, and can be easily inserted into the purge pipe. That is, it becomes easier to attach the rectifier to the purge pipe.

Schematic of an internal combustion engine. Explanatory drawing which shows the periphery structure of a purge valve. (A) is a front view of a rectifier. (B) is sectional drawing of the rectifier in the 3-3 line in (a). Explanatory drawing which shows a mode that a rectifier is attached with respect to a purge pipe | tube.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. First, a schematic configuration of the internal combustion engine 100 to which the present invention is applied will be described. In the following description, the terms “upstream” and “downstream” indicate upstream and downstream in the flow direction of intake air, exhaust gas, evaporated fuel, and outside air.

  As shown in FIG. 1, the internal combustion engine 100 includes an intake pipe 11 for introducing intake air from the outside of the internal combustion engine 100. A throttle valve 21 is arranged in the upstream side intake pipe 11 a of the intake pipe 11. The throttle valve 21 controls the amount of intake air flowing through the flow path of the upstream side intake pipe 11a by opening and closing the flow path of the upstream side intake pipe 11a.

  The downstream side of the upstream side intake pipe 11a is connected to a surge tank 11b for suppressing intake pulsation and the like. A downstream side of the surge tank 11 b in the intake pipe 11 is connected to a downstream intake pipe 11 c in the intake pipe 11.

  The downstream side of the downstream side intake pipe 11c in the intake pipe 11 is connected to a cylinder 12 that mixes fuel with the intake air and burns it. Fuel is injected into the cylinder 12 by a fuel injection valve 22. A piston 23 that reciprocates inside the cylinder 12 is disposed inside the cylinder 12. An exhaust pipe 13 for exhausting exhaust from the cylinder 12 is connected to the cylinder 12.

  The internal combustion engine 100 includes a fuel tank 31 that stores fuel for supplying fuel to the fuel injection valve 22. Although not shown, a feed pump is accommodated in the fuel tank 31, and the fuel pumped by the feed pump is supplied to the fuel injection valve 22 through the fuel pipe.

  The fuel tank 31 is connected to an evaporative fuel processing device 50 that suppresses the release of the evaporative fuel generated in the fuel tank 31 to the atmosphere. The evaporated fuel processing apparatus 50 includes a canister 52 that adsorbs evaporated fuel generated in the fuel tank 31. One end of a vapor pipe 51 through which evaporated fuel flows is connected to the canister 52. The other end of the vapor pipe 51 reaches the fuel tank 31. A check valve 61 that suppresses the flow of evaporated fuel from the canister 52 side to the fuel tank 31 side is attached midway in the vapor pipe 51.

  The canister 52 is connected to an outside air introduction pipe 53 that introduces outside air into the canister 52. In the middle of the outside air introduction pipe 53, an outside air introduction valve 62 for switching the flow path of the outside air introduction pipe 53 to one of an open state and a closed state is attached.

  The canister 52 is connected to a purge pipe 55 that connects the canister 52 and the surge tank 11b. In the present embodiment, a part of the upstream side (canister 52 side) of the purge pipe 55 is formed of a steel-made upstream pipe-shaped upstream purge pipe 56, and the downstream side (surge tank) of the purge pipe 55. 11b side) is made of a rubber-made downstream pipe-shaped downstream purge pipe 57. A purge valve 65 for switching the flow path of the purge pipe 55 to either one of the open state and the closed state is attached to a connection portion between the upstream purge pipe 56 and the downstream purge pipe 57.

  The purge valve 65 and the outside air introduction valve 62 are controlled to open and close by the control device 80. The control device 80 outputs a control signal for controlling the opening and closing of the purge valve 65 to the purge valve 65. Further, the control device 80 outputs a control signal for opening / closing the outside air introduction valve 62 to the outside air introduction valve 62. In the present embodiment, the control device 80 controls the entire internal combustion engine 100 such as the opening of the throttle valve 21 and the fuel injection amount of the fuel injection valve 22 in addition to the control of the purge valve 65 and the outside air introduction valve 62 described above. It is configured as an electronic control unit (ECU) for control.

Next, the peripheral configuration of the purge valve 65 will be specifically described.
As shown in FIG. 2, the purge valve 65 includes a substantially cylindrical valve body 66. The valve body 66 has a communication hole 66a having a circular cross section extending in the gas flow direction (left and right direction in FIG. 2). In addition, the open state and the closed state of the flow path in the purge valve 65 are switched by opening and closing the communication hole 66a by a valve body (not shown).

  From the end surface of the valve body 66 on the canister 52 side (the right side in FIG. 2), a substantially cylindrical inlet portion 67 projects. The outer diameter of the inlet portion 67 is substantially the same as the inner diameter of the upstream purge pipe 56. An inlet hole 67a that is an internal space of the inlet portion 67 communicates with the communication hole 66a. An end of the upstream purge pipe 56 in the purge pipe 55 is connected to the inlet 67 of the purge valve 65. In the present embodiment, the inlet portion 67 of the purge valve 65 is inserted into the upstream side purge pipe 56 so that both are connected.

  A substantially cylindrical outlet 68 protrudes from the end face of the valve body 66 on the intake pipe 11 side (left side in FIG. 2). The outer diameter of the outlet portion 68 is slightly larger than the inner diameter of the downstream purge pipe 57 before the purge valve 65 is connected. An outlet hole 68a that is an internal space of the outlet portion 68 communicates with the communication hole 66a. The outlet 68 of the purge valve 65 is connected to the end of the purge pipe 57 on the downstream side of the purge pipe 55. In the present embodiment, the outlet 68 of the purge valve 65 is inserted into the downstream purge pipe 57 so that they are connected. Accordingly, the portion of the downstream purge pipe 57 where the outlet 68 is inserted is elastically deformed radially outward, and the outer diameter of the outlet 68 and the inner diameter of the downstream purge pipe 57 are substantially the same. It has become.

  Note that the connection point X between the outlet 68 of the purge valve 65 and the downstream purge pipe 57 in the purge pipe 55 is a region where the downstream purge pipe 57 covers from the outside in the outlet 68 of the purge valve 65 (in FIG. 2, the outlet part). 68).

  A cylindrical rectifier 70 as a whole is inserted into the downstream purge pipe 57. The rectifier 70 is attached so that the axial direction of the rectifier 70 is along the gas flow direction of the downstream purge pipe 57. The outer diameter of the rectifier 70 is substantially the same as the outer diameter of the outlet portion 68 of the purge valve 65. Further, the outer diameter of the rectifier 70 is slightly larger than the inner diameter of the downstream purge pipe 57 before the rectifier 70 is attached. Then, by inserting the rectifier 70 into the downstream purge pipe 57, the portion of the downstream purge pipe 57 where the rectifier 70 is inserted is elastically deformed radially outward. Therefore, when the rectifier 70 is attached, the outer diameter of the rectifier 70 and the inner diameter of the downstream purge pipe 57 are substantially the same.

  The rectifier 70 is disposed at a position adjacent to the outlet portion 68 on the downstream side of the outlet portion 68 of the purge valve 65. That is, in this embodiment, the rectifier 70 is disposed at a position adjacent to the downstream side in the gas flow direction with respect to the connection point X between the outlet portion 68 of the purge valve 65 and the downstream purge pipe 57 in the purge pipe 55. In this embodiment, the upstream end of the rectifier 70 and the downstream end of the outlet portion 68 of the purge valve 65 are in contact with each other.

  As shown in FIGS. 3A and 3B, the rectifier 70 includes a substantially cylindrical main body 71 located in the center in the axial direction, an upstream cylindrical portion 72 located on both sides in the axial direction, and a downstream side. It can be roughly divided into a cylindrical portion 73. Six rectifying chambers 71 a pass through the main body 71 from the upstream end face to the downstream end face of the main body 71. The rectifying chambers 71 a extend in parallel with each other along the axial direction of the main body 71. As shown in FIG. 3A, each rectifying chamber 71a has a circular shape when viewed from the gas flow direction. When viewed from the gas flow direction, one of the six rectifying chambers 71 a is located at the approximate center of the main body 71. In addition, when viewed from the gas flow direction, the remaining five of the six rectifying chambers 71a surround the one rectifying chamber 71a located substantially in the center of the main body 71 so as to surround the peripheral portion of the main body 71. They are evenly lined up in the direction.

  As shown in FIG. 3B, a substantially cylindrical upstream cylindrical portion 72 protrudes from the upstream end surface of the main body portion 71 in the axial direction toward the upstream side in the gas flow direction. The outer diameter of the upstream cylindrical portion 72 is substantially the same as the outer diameter of the main body portion 71. That is, the upstream cylindrical portion 72 extends along the outer peripheral edge of the end surface on the upstream side in the axial direction of the main body portion 71. In the gas flow direction, the length of the upstream cylindrical portion 72 is substantially ½ of the length of the main body portion 71. The internal space 72 a of the upstream cylindrical portion 72 has a substantially columnar shape and communicates with each rectifying chamber 71 a of the main body 71. In addition, the upstream end portion of the outer peripheral surface of the upstream cylindrical portion 72 is a tapered surface 72b whose outer diameter is smaller toward the upstream side. The thickness T2 of the wall portion of the upstream cylindrical portion 72 is the shortest distance from the outer peripheral surface of the main body portion 71 to the rectifying chamber 71a, that is, the smallest thickness T1 of the wall portions defining the rectifying chambers 71a in the main body portion 71. It is thinner than. Thus, the upstream cylindrical portion 72 has a thin structure as compared with the main body portion 71.

  From the end surface of the main body 71 on the downstream side in the axial direction, a substantially cylindrical downstream cylindrical portion 73 projects toward the downstream side in the gas flow direction. The outer diameter of the downstream cylindrical portion 73 is substantially the same as the outer diameter of the main body portion 71. That is, the downstream side cylindrical portion 73 extends along the outer peripheral edge of the end surface of the main body portion 71 on the downstream side in the axial direction. In the gas flow direction, the length of the downstream cylindrical portion 73 is approximately ½ of the length of the main body portion 71. The internal space 73 a of the downstream side tubular portion 73 has a substantially cylindrical shape and communicates with each rectifying chamber 71 a of the main body portion 71. The downstream end of the outer peripheral surface of the downstream cylindrical portion 73 is a tapered surface 73b having an outer diameter that decreases toward the downstream side. The thickness T3 of the wall portion of the downstream cylindrical portion 73 is the shortest distance from the outer peripheral surface of the main body portion 71 to the rectifying chamber 71a, that is, the smallest thickness T1 of the wall portions defining the rectifying chambers 71a in the main body portion 71. It is thinner than. Thus, the downstream side cylindrical portion 73 has a thin structure as compared with the main body portion 71.

  Next, the airflow noise suppression effect by the rectifier 70 will be described. As shown in FIG. 1, the control device 80 controls the outside air introduction valve 62 to be in an open state from when the operation of the internal combustion engine 100 is started until when the operation of the internal combustion engine 100 is ended.

  As shown in FIG. 1, depending on the operating state of the internal combustion engine 100, for example, when the control device 80 controls the purge valve 65 to be closed when the evaporated fuel in the canister 52 is relatively small, the purge valve 65 purges. The flow path of the tube 55 is closed. In this case, the evaporated fuel generated in the fuel tank 31 flows into the canister 52 through the vapor pipe 51. The evaporated fuel that has flowed into the canister 52 is adsorbed inside the canister 52.

  On the other hand, according to the operating state of the internal combustion engine 100, for example, when the control device 80 controls the purge valve 65 to be open when the amount of evaporated fuel inside the canister 52 is relatively large, the purge valve 65 causes the flow path of the purge pipe 55 to flow. Becomes open. In this case, the outside air flows into the canister 52 through the outside air introduction pipe 53 due to the negative pressure in the intake pipe 11. Then, the evaporated fuel and the outside air adsorbed inside the canister 52 flow into the surge tank 11 b in the intake pipe 11 through the purge pipe 55.

  As shown in FIG. 2, when the evaporated fuel and the outside air gas flow into the intake pipe 11 via the purge pipe 55, the pressure in the upstream purge pipe 56 upstream of the purge valve 65 and the purge valve 65 The pressure difference from the pressure in the downstream downstream purge pipe 57 becomes large. Then, the flow rates of the evaporated fuel and the outside air gas are most likely to be highest immediately downstream of the connection point X between the outlet 68 of the purge valve 65 and the downstream purge pipe 57 in the purge pipe 55. Here, if the rectifier 70 is not provided, the flow rate of the evaporated fuel and the outside gas increases, and the evaporated fuel and the outside gas flow when the gas flows through the communication hole 66a of the purge valve 65 and the like. As the flow is disturbed, the flow of the evaporated fuel and the outside gas is greatly disturbed near the outlet 68 of the purge valve 65, and a gas vortex is likely to occur. When the vortex of the evaporated fuel and the gas of the outside air is generated as described above, an air flow noise may be generated by the vortex of the gas.

  In the present embodiment, the rectifier 70 is connected to the downstream purge pipe 57 in the purge pipe 55 and the surge tank 11 b in the intake pipe 11 from the connection point X between the outlet 68 of the purge valve 65 and the downstream purge pipe 57 in the purge pipe 55. Located between the connection points. The rectifier 70 has a plurality of rectification chambers 71a. Therefore, the gas flowing through each rectifying chamber 71a is rectified in the direction in which the gas flows while flowing through each rectifying chamber 71a. And after gas flows out from each rectification room 71a, gas which flowed out from one rectification room 71a does not spread easily to the gas side which flowed out from other rectification room 71a. Thereby, it can suppress that the flow of gas is disturb | confused and a vortex | eddy_current generate | occur | produces downstream from the rectification | straightening chamber 71a. As a result, it is possible to suppress the airflow sound accompanying the generation of gas vortex.

In this embodiment, the operation and effect when the rectifier 70 is attached to the downstream purge pipe 57 will be described.
As shown in FIG. 2, the outer diameter of the rectifier 70 is slightly larger than the inner diameter of the downstream purge pipe 57 before the rectifier 70 is attached. Therefore, when the rectifier 70 is attached to the downstream purge pipe 57, the rectifier 70 is inserted into the downstream purge pipe 57 while elastically deforming the downstream purge pipe 57 radially outward.

  As shown in FIG.3 (b), in this embodiment, the downstream cylindrical part 73 in the rectifier 70 is the cylinder shape in which the substantially cylindrical internal space 73a was divided. That is, the downstream cylindrical portion 73 in the rectifier 70 does not have a wall portion for partitioning the rectification chamber 71 a unlike the main body portion 71. Therefore, the downstream side tubular portion 73 is more easily elastically deformed than the main body portion 71 so as to bend in the radial direction. Therefore, as shown in FIG. 4, when the downstream tubular portion 73 in the rectifier 70 is inserted into the upstream end portion of the downstream purge pipe 57, the downstream tubular portion 73 becomes the downstream tubular portion. It is elastically deformed so as to bend radially inward with the connection portion between the portion 73 and the body portion 71 as a fulcrum. Then, since the outer diameter of the downstream cylindrical portion 73 is reduced, the downstream cylindrical portion 73 can be easily inserted into the downstream purge pipe 57. That is, the rectifier 70 can be more easily attached to the downstream purge pipe 57. In FIG. 4, the elastic deformation inward in the radial direction in the downstream side tubular portion 73 is exaggerated. The same effect can be obtained when the upstream cylindrical portion 72 in the rectifier 70 is inserted into the downstream end portion of the downstream purge pipe 57.

  Further, as shown in FIG. 3B, in this embodiment, in the radial direction of the rectifier 70, the thickness T3 of the wall portion of the downstream cylindrical portion 73 is a wall that divides each rectification chamber 71 a in the main body portion 71. It is thinner than the smallest thickness T1 of the portions. Therefore, in the present embodiment, for example, the thickness T3 of the wall portion of the downstream cylindrical portion 73 is the same as the smallest thickness T1 of the wall portions that define the rectifying chambers 71a in the main body portion 71. In comparison, the downstream cylindrical portion 73 is easily elastically deformed so as to bend in the radial direction.

  In the present embodiment, the downstream side end portion of the outer peripheral surface of the downstream side cylindrical portion 73 is a tapered surface 73b whose outer diameter becomes smaller toward the downstream side. The outer diameter of the downstream cylindrical portion 73 in the rectifier 70 is slightly larger than the inner diameter of the downstream purge pipe 57 before the rectifier 70 is attached. Therefore, when the downstream cylindrical portion 73 in the rectifier 70 is inserted into the upstream end portion of the downstream purge pipe 57, the tapered surface 73 b of the rectifier 70 is formed on the upstream end portion of the downstream purge pipe 57. Abuts on the inner periphery. Then, a part of the force for inserting the rectifier 70 along the axial direction of the downstream purge pipe 57 is converted into a force for bending the downstream cylindrical portion 73 radially inward by the tapered surface 73b. The Therefore, in this embodiment, the rectifier 70 can be inserted into the downstream purge pipe 57 more quickly.

This embodiment can be implemented with the following modifications. The present embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.
-In the said embodiment, the shape of the rectifier 70 can be changed suitably. For example, the rectifier 70 may have an elliptic cylinder shape as a whole. Further, for example, even when the tapered surface 72b of the upstream cylindrical portion 72 and the tapered surface 73b of the downstream cylindrical portion 73 are not provided, the rectifier 70 can be sufficiently inserted into the downstream purge pipe 57. Can omit the tapered surface 72b and the tapered surface 73b.

  In the above embodiment, one of the upstream cylindrical portion 72 and the downstream cylindrical portion 73 in the rectifier 70 may be omitted. For example, as shown in FIG. 2, when the rectifier 70 is inserted into the upstream end portion of the downstream purge pipe 57 from the upstream end side of the downstream purge pipe 57, The cylindrical part 72 may be omitted. Further, when the rectifier 70 is inserted into the downstream end portion of the downstream purge pipe 57 from the downstream end portion side of the downstream purge pipe 57, the downstream cylindrical portion 73 of the rectifier 70 is omitted. May be.

  In the above embodiment, the thickness relationship between the wall thickness T3 of the downstream cylindrical portion 73 and the smallest thickness T1 of the wall portions that divide each rectifying chamber 71a in the main body portion 71 may be changed. For example, in the radial direction of the rectifier 70, the thickness T3 of the wall portion of the downstream cylindrical portion 73 may be the same as the smallest thickness T1 of the wall portions defining the rectifying chambers 71a in the main body portion 71. Good. Similarly, in the radial direction of the rectifier 70, the thickness T2 of the wall portion of the upstream cylindrical portion 72 is the same as the smallest thickness T1 of the wall portions that define the rectifying chambers 71a in the main body portion 71. Also good.

  -In the said embodiment, the shape of the main-body part 71 in the rectifier 70 can be changed suitably. For example, the number of the rectifying chambers 71a in the main body 71 may be appropriately changed as long as it is two or more. The rectifying chamber 71a may have an elliptical shape or a polygonal shape when viewed from the gas flow direction.

  Further, in the main body 71 of the rectifier 70, the internal space of the main body 71 may be partitioned by a plurality of partition walls extending in a lattice shape. Furthermore, in the main body 71 of the rectifier 70, the internal space of the main body 71 may be partitioned into a honeycomb shape by a plurality of partition walls. In these cases, the space partitioned by each partition wall constitutes the rectifying chamber 71a.

  In the above embodiment, the position of the rectifier 70 may be changed as appropriate. For example, the rectifier 70 may be attached to the inside of the outlet hole 68 a in the outlet portion 68 of the purge valve 65. In this case, the rectifier 70 is located at a connection point X between the outlet 68 of the purge valve 65 and the downstream purge pipe 57 in the purge pipe 55. In this configuration as well, the rectifier 70 is located inside the downstream purge pipe 57 in the radial direction, so that the rectifier 70 is inserted into the downstream purge pipe 57.

  Further, the rectifier 70 may be located at a connection point between the downstream purge pipe 57 in the purge pipe 55 and the surge tank 11 b in the intake pipe 11. Further, the rectifier 70 may be inserted into the downstream purge pipe 57 in the purge pipe 55 at a position spaced from the downstream end of the outlet portion 68 in the purge valve 65.

  In the above embodiment, the rectifier 70 may have a function as an adapter that connects a plurality of downstream purge pipes 57. For example, it is assumed that the downstream purge pipe 57 includes a first purge pipe located on the upstream side and a second purge pipe located on the downstream side. In this case, a rectifier 70 that connects between the first purge pipe and the second purge pipe may be attached between the first purge pipe and the second purge pipe in the downstream side purge pipe 57. Specifically, the upstream side in the axial direction of the rectifier 70 is inserted into the first purge pipe, the downstream side in the axial direction of the rectifier 70 is inserted into the second purge pipe, and the rectifier 70 is inserted into the first purge pipe. It may be inserted across the tube and the second purge tube. In this configuration, at least the upstream cylindrical portion 72 of the rectifier 70 is inserted into the first purge pipe of the downstream purge pipe 57, and at least the downstream cylindrical section 73 of the rectifier 70 is inserted into the first purge pipe 57 of the downstream purge pipe 57. 2 is inserted into the purge pipe.

  In the above-described embodiment, the connection configuration between the downstream purge pipe 57 and the outlet portion 68 of the purge valve 65 in the purge pipe 55 can be changed as appropriate. For example, the upstream end of the downstream purge pipe 57 in the purge pipe 55 and the downstream end of the outlet portion 68 of the purge valve 65 may be joined. In this case, the joint surface between the two is a connection point between the outlet 68 of the purge valve 65 and the downstream purge pipe 57 in the purge pipe 55.

  X: Connection point, 11: Intake pipe, 11a: Upstream intake pipe, 11b ... Surge tank, 11c ... Downstream intake pipe, 12 ... Cylinder, 13 ... Exhaust pipe, 21 ... Throttle valve, 22 ... Fuel injection valve, 23 DESCRIPTION OF SYMBOLS ... Piston, 31 ... Fuel tank, 50 ... Evaporative fuel processing device, 51 ... Vapor pipe, 52 ... Canister, 53 ... Outside air introduction pipe, 55 ... Purge pipe, 56 ... Upstream purge pipe, 57 ... Downstream purge pipe, 61 ... Check valve, 62 ... Outside air introduction valve, 65 ... Purge valve, 66 ... Valve body, 66a ... Communication hole, 67 ... Inlet part, 67a ... Inlet hole, 68 ... Outlet part, 68a ... Outlet hole, 70 ... Rectifier, 71 ... Body part, 71a ... Rectifier chamber, 72 ... Upstream cylindrical part, 72a ... Internal space, 72b ... Tapered surface, 73 ... Downstream cylindrical part, 73a ... Internal space, 73b ... Tapered surface, 80 ... Control device, 100: Internal combustion Seki.

Claims (1)

A canister that introduces evaporated fuel generated in the fuel tank and adsorbs the evaporated fuel, an outside air introduction pipe that is connected to the canister and introduces outside air into the canister, and is downstream of the throttle valves in the canister and the intake pipe An evaporative fuel processing apparatus comprising: a purge pipe that connects a portion on the side; and a purge valve that is provided in the purge pipe and that switches a flow path of the purge pipe to one of an open state and a closed state;
A rectifier is provided between a connection portion between the outlet portion of the purge valve and the purge pipe and a connection portion between the purge pipe and the intake pipe,
The rectifier includes a columnar main body section in which a plurality of rectifying chambers are partitioned, and a cylindrical tubular section protruding in the gas flow direction from an end surface in the axial direction of the main body section,
At least the cylindrical part of the rectifier is inserted into the purge pipe.