JP2009281229A - Supercharging bypass device for internal combustion engine with supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate opening and closing of a cap case 8 of an air cleaner in a device which is provided with a supercharging bypass passage 11 connecting a supercharging passage 6 at a downstream of the supercharger in an intake air route and the air cleaner in the intake air route from the air cleaner 3 to an internal combustion engine 1 via the supercharger 2, and which is provided with a supercharging pressure control valve 12 in the supercharging bypass passage. <P>SOLUTION: A soft elastic body flexible hose 14 is used for a section from the supercharging pressure control valve to the cap case of the air cleaner in the supercharging bypass passage. The flexible hose is bent in a L-shape against its elasticity. The supercharging pressure control valve 12 is supported in such a manner that the flexible hose is rotated to a straightly extending direction from a L-shape bend condition. The flexible hose is energized in a direction opening the cap case of the air cleaner under the L-shape bend condition. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a supercharging bypass device provided in an intake path from an air cleaner to the internal combustion engine through the supercharger in an internal combustion engine equipped with a supercharger such as an exhaust turbocharger.

  In general, in an internal combustion engine equipped with a supercharger such as an exhaust turbocharger, the supercharger is bypassed in the intake path from the air cleaner to the internal combustion engine through the supercharger, and the downstream side and the upstream side. A supercharging bypass passage is connected to the turbocharger, and when the supercharging pressure downstream from the supercharger becomes higher than a predetermined value during deceleration or the like, the supercharging pressure control valve in the supercharging bypass passage is opened. The supercharging pressure is controlled so as not to exceed a predetermined value by blowing the supercharging intake air upstream.

In this case, conventionally, as described in, for example, Patent Documents 1 and 2, the supercharged intake air is blown to the upstream side of the turbocharger through the supercharging bypass passage, thereby preventing the supercharged intake air. It is configured to reduce noise associated with blow.
No. 1-22139 Japanese Utility Model Publication No. 6-336958

  In order to avoid fouling of the filter element in the air cleaner when the air cleaner is blown through the supercharged bypass passage, the air cleaner is joined to the main body case containing the filter element so as to be openable and closable. It is preferable to connect the supercharged bypass passage to the cap case.

  However, with this configuration, the opening and closing operation of the cap case is significantly hindered due to the supercharged bypass passage connected thereto, so that the filter element cannot be easily replaced. Will be invited.

  The present invention has a technical problem to solve this problem.

In order to achieve this technical problem, claim 1 of the present invention provides:
“A supercharger that bypasses the supercharger and connects the supercharger passage downstream of the supercharger and the air cleaner in the intake path to the internal combustion engine from the air cleaner to the internal combustion engine. In a supercharging bypass device having a supply bypass passage and a supercharging pressure control valve provided in the supercharging bypass passage,
The portion of the supercharging bypass passage from the supercharging pressure control valve to the cap case in the air cleaner is a flexible hose made of a soft elastic body, and this flexible hose is resistant to its elasticity. On the other hand, the supercharging pressure control valve is supported so that the flexible hose rotates in a linearly extending direction from an L-shaped state, and the flexible hose is further bent. The flexible hose is configured to bias the cap case in the air cleaner in a direction in which the flexible hose is bent in an L shape. "
It is characterized by that.

Further, claim 2 of the present invention is
“In the first aspect of the present invention, a portion of the supercharging bypass passage from the supercharging pressure control valve to the supercharging passage is a second flexible hose made of a soft elastic body. The flexible hose is configured to urge the supercharging pressure control valve so as to rotate in a direction extending linearly from a state where the flexible hose is bent in an L shape.
It is characterized by that.

  According to the first aspect of the present invention, the cap case in the air cleaner is biased in the opening direction by the elasticity of the flexible hose in the supercharging bypass passage. It can be pushed open by releasing the match. Next, the cap case is opened so that the flexible hose extends linearly from the L shape, and in addition, the supercharging pressure control valve extends from the L shape to the linear shape. Since it rotates in the direction that extends, it will be opened further.

  Accordingly, the filter element can be easily replaced by opening and closing the cap case.

  According to the second aspect of the present invention, the second flexible hose can increase the urging force when the cap case is first pushed open, and the cap case can be opened larger. Can help the effect.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  In this figure, reference numeral 1 denotes an internal combustion engine, reference numeral 2 denotes an exhaust turbocharger driven by the exhaust gas of the internal combustion engine 1, and reference numeral 3 denotes an air cleaner.

  The air taken into the air cleaner 3 from the air introduction pipe 4 reaches the exhaust turbocharger 2 through the air cleaner 3 through the intake passage 5, and is compressed here, and then the internal combustion engine through the supercharge passage 6. 1 is inhaled.

  As is well known in the art, the air cleaner 3 is divided into a main body case 7 containing a filter element and a cap case 8 with respect to the main body case 7, and the cap case 8 has one end thereof. Is pivotally attached to the main body case 7 by a hinge 9 so that the other end can be detachably joined to the main body case 7 by a clip 10. With respect to the case 7, as shown by a two-dot chain line in FIG.

  The cap passage 8 can be freely opened and closed by providing a soft elastic body bellows tube or a soft elastic body hose tube in the intake passage 5 in the middle thereof. It is configured to do.

  Reference numeral 11 denotes a supercharging bypass passage that bypasses the exhaust turbocharger 2 and connects the supercharging passage 6 and the air cleaner 3. A supercharging pressure control valve 12 that opens when the supercharging pressure in the supply passage 6 becomes higher than a predetermined value is provided. The supercharging pressure control valve 12 is provided on the lower surface of the main body case 7 in the air cleaner 3 in detail. Is attached to a bracket 13 described later so as to freely rotate about the horizontal axis 14 as a central axis.

  As shown in FIGS. 3 and 4, the bracket 13 has a structure in which a metal plate is bent downward in a U-shape, and in the long slot holes 13 a ′ and 13 b ′ formed in the left and right vertical plates 13 a and 13 b, The supercharging pressure control valve 12 is rotatably supported by fitting a flange 12a provided on the supercharging pressure control valve 12. In this case, the supercharging pressure control valve 12 rotates freely in the direction of arrow A, but the rotation in the direction of arrow B opposite to this is blocked by a stopper 12a 'provided in the flange 12a. It is configured as follows.

  A portion of the supercharging bypass passage 11 from the supercharging pressure control valve 12 to the air cleaner 3 is constituted by a first flexible hose 14 made of a soft elastic material such as rubber, while the supercharging bypass A portion from the supercharging pressure control valve 12 to the supercharging passage 6 in the passage 11 is similarly constituted by a second flexible hose 15 made of a soft elastic material such as rubber.

  The first flexible hose 14 includes a hose insertion pipe 16 provided laterally on the supercharging pressure control valve 12 and a hose insertion pipe provided downward on the bulging portion 17 on the side surface of the cap case 8 of the air cleaner 3. 18 is inserted and connected in a bent state in an L shape against the elasticity of the first flexible hose 14, and the first flexible hose is bent in the L shape. 14, the cap case 8 in the air cleaner 3 is urged in the opening direction as indicated by an arrow C.

  The second flexible hose 15 includes a second hose insertion pipe 19 provided laterally on the supercharging pressure control valve 12 and a hose insertion pipe 20 provided on the supercharging passage 6. 15 is bent and connected in a U-shape against the elasticity at 15, and in this state, the boost pressure control valve 12 is moved in the direction of the arrow A by the elasticity of the second flexible hose 15. It is configured to urge so as to rotate in the direction.

  In this configuration, the cap case 8 in the air cleaner 3 is urged in the opening direction by the elasticity of the first flexible hose 14 in the supercharging bypass passage 11. By releasing the joint engagement by 10 or the like, it is pushed open as shown in FIG.

  Moreover, since the elasticity of the second flexible hose 15 in the supercharging bypass passage 11 is also added to the biasing of the cap case 8 in the opening direction, the cap case 8 can be more reliably pushed open. .

  Next, the cap case 8 is opened so that the first flexible hose extends linearly from an L shape as shown by a two-dot chain line in FIG. Since the valve 12 rotates in the direction in which the first flexible hose extends linearly from the L shape (the direction of the arrow A), the valve 12 is further opened.

  In addition, the second flexible hose 15 allows rotation of the first flexible hose in the supercharging pressure control valve 12 in a direction extending linearly from an L shape. It can be opened larger.

  In the above embodiment, the supercharging pressure control valve 12 is supported by the main body case 7 of the air cleaner 3. However, the present invention is not limited to this, and the supercharging pressure control valve 12 is configured as described above. It can be supported on a member other than the main body case 7, such as a support bracket of an air cleaner or a vehicle body frame in a vehicle.

  Needless to say, the supercharger is not limited to the exhaust turbocharger 2 but can be applied to a case where a mechanical supercharger driven by an internal combustion engine is used.

It is a front view which shows embodiment of this invention. FIG. 2 is a side view taken along the line II-II in FIG. 1. It is a figure which shows the support of a supercharging pressure control valve. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is a figure which shows the state which opened the cap case of the air cleaner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Exhaust turbocharger 3 Air cleaner 5 Intake passage 6 Supercharging passage 7 Air cleaner main body case 8 Air cleaner cap case 11 Supercharging bypass passage 12 Supercharging pressure control valve 13 Bracket 14 1st flexible hose 15 1st 2 Flexible hose

Claims (2)

A supercharger that bypasses the supercharger and connects the air cleaner between the air cleaner and the supercharger that is downstream of the supercharger in the intake path from the air cleaner to the internal combustion engine. In a supercharging bypass device having a bypass passage and a supercharging pressure control valve in the supercharging bypass passage,
The portion of the supercharging bypass passage from the supercharging pressure control valve to the cap case in the air cleaner is a flexible hose made of a soft elastic body, and this flexible hose is resistant to its elasticity. On the other hand, the supercharging pressure control valve is supported so that the flexible hose rotates in a linearly extending direction from an L-shaped state, and the flexible hose is further bent. The supercharging bypass device in an internal combustion engine with a supercharger is characterized in that the flexible hose is configured to bias the cap case in the air cleaner in a state of bending the flexible hose into an L shape. .   The portion of the supercharging bypass passage from the supercharging pressure control valve to the supercharging passage is the second flexible hose made of a soft elastic body. The flexible hose is configured to urge the supercharging pressure control valve so as to rotate in a direction extending linearly from a state where the flexible hose is bent in an L shape. A supercharging bypass device in an internal combustion engine with a machine.

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