JP6909433B2 - Connection structure of flow path forming member - Google Patents

Description

The present invention relates to a connection structure of a flow path forming member.

Patent Document 1 describes an intake duct of a cab-over type vehicle including a snorkel as an intake duct fixed to the rear wall of the cab and a rubber bellows-shaped upper elastic cylinder integrally connected to the lower part of the snorkel. Is described. The upper end of the upper elastic cylinder is fastened and fixed to the lower edge of the snorkel with a belt. Further, a structure is shown in which the inner peripheral surface of the upper end portion of the upper elastic cylinder is inserted into the outer peripheral surface of the lower edge portion of the snorkel from below.

Japanese Unexamined Patent Publication No. 09-144615

In the structure described in Patent Document 1, the upper end portion of the upper elastic cylinder (first flow path forming member) is inserted into the outer peripheral surface of the lower edge portion of the snorkel (second flow path forming member) from below. The second flow path forming member and the first flow path forming member are connected by tightening the upper end portion of the first flow path forming member with a belt (clamp). Therefore, the water flowing down along the outer peripheral surface of the second flow path forming member may be applied to the housing of the clamp, and the housing may be rusted.

Therefore, an object of the present invention is to provide a connection structure of a flow path forming member capable of suppressing rusting of the housing by making it difficult for water to splash on the housing.

In order to achieve the above object, the connection structure of the flow path forming member includes a first flow path forming member, a second flow path forming member, and a clamp. The first flow path forming member has an elastic tubular first connecting portion that opens upward. The second flow path forming member has a diameter from at least a part of a tubular second connecting portion inserted inside the first connecting portion, an intermediate annular portion above the second connecting portion, and an intermediate annular portion. It has a protruding portion that protrudes outward in the direction. The clamp has a band extending in an annular shape along the outer peripheral surface of the first connecting portion, and a housing provided at one end of the band and reducing the diameter of the band by winding the other end of the band.

The projecting portion has a housing upper region that is disposed above the housing in a member-connected state in which the first connecting portion is clamped from the outside of the second connecting portion. The upper surface of the housing upper region changes the flow direction of the water flowing down along the outer surface of the second flow path forming member toward the housing toward one side or both sides in the circumferential direction of the intermediate annular portion separated from the housing. It is a guide surface.

In the above configuration, the protruding portion has a housing upper region arranged above the housing in a member connected state in which the first connecting portion is clamped from the outside of the second connecting portion. The upper surface of the housing upper region changes the flow direction of the water flowing down along the outer surface of the second flow path forming member toward the housing toward one side or both sides in the circumferential direction of the intermediate annular portion separated from the housing. Since it is a guide surface, it is possible to prevent water from splashing on the housing, and it is possible to suppress rusting of the housing.

Further, the guide surface may be an inclined surface that inclines diagonally downward toward one side or both sides in the circumferential direction of the intermediate annular portion.

In the above configuration, the guide surface is an inclined surface that inclines diagonally downward toward one side or both sides in the circumferential direction of the intermediate annular portion. Therefore, the water flowing down along the outer surface of the second flow path forming member toward the housing is guided diagonally downward along the inclination of the guide surface. Therefore, it is possible to more reliably suppress water splashing on the housing.

Further, the cross-sectional shape of the intermediate annular portion may be an oval shape in which one ends and the other ends of a pair of linear portions facing each other are continuous via a pair of curved linear portions. The housing upper region projects radially outward from one of the pair of linear portions. The guide surface is an inclined surface of the left and right inclined obliquely downward toward both sides in the circumferential direction of the intermediate annular portion.

In the above structure, the guide surface is a left-right inclined surface that inclines diagonally downward toward both sides in the circumferential direction of the intermediate annular portion. Therefore, the water flowing down along the outer surface of the second flow path forming member toward the housing is guided diagonally downward along the left-right inclination of the guide surface. Therefore, it is possible to more reliably suppress water splashing on the housing.

According to the present invention, it is possible to suppress rusting of the housing by making it difficult for water to splash on the housing.

It is a perspective view which shows the vehicle which has the connection structure of the flow path forming member which concerns on embodiment of this invention. It is a front view which shows the intake pipe. It is an enlarged view of the main part of the intake duct of FIG. FIG. 3 is a cross-sectional view taken along the line IV-IV of FIG. It is a cross-sectional view taken along the line VV of FIG. It is sectional drawing which shows the deformation example of the protruding part. It is sectional drawing which shows the modification of another protrusion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, FR indicates the front of the vehicle, UP indicates the upper side, and IN indicates the inner side in the vehicle width direction. Further, in the following description, the left-right direction means the left-right direction in a state of facing the front of the vehicle.

As shown in FIG. 1, the connection structure of the flow path forming member according to the present embodiment is applied to the connection of the intake pipe (flow path forming member) 3 that circulates the sucked air to the air cleaner 4. The vehicle 1 provided with the intake pipe 3 is a tractor 1 that pulls a trailer (not shown), and the cab 2 is arranged above the front part of a pair of left and right side members (not shown) extending in front of and behind the tractor 1. Will be done. The cab 2 is supported so that the front end side of the cab 2 can be tilted with respect to the chassis side about the tilt axis (not shown). Be supported. An engine (not shown) is arranged at the center of the vehicle width below the cab 2. Above the rear portion of the side member, a coupler 5 which is a connecting device for connecting the trailer to the tractor 1 is arranged. The intake pipe 3 is a duct through which intake air to the engine flows, is arranged behind the outer end portion on the right side of the rear surface 2a of the cab 2 in the vehicle width direction, and extends in the vertical direction along the rear surface 2a of the cab 2. It is fixed to the rear surface 2a of the cab 2 and includes a vertical duct (second flow path forming member) 6, a bellows-shaped duct (first flow path forming member) 7, and a clamp 8.

As shown in FIGS. 2 to 4, the vertical duct 6 is a resin duct, and is an internal flow path (described later) that continuously extends from the upper outer intake port 20 and the rear intake port 21 to the lower end opening 23 at the lower end. The duct main body 10 for partitioning the upper end flow path 15, the intermediate flow path 16, and the lower end flow path 17) and the resonator portion 11 partitioned by the rib 33 from the duct main body 10 are integrally provided. .. The vertical duct 6 is formed to be thin in the front-rear direction so as not to protrude significantly behind the cab 2.

The duct main body portion 10 has a duct upper end portion 12, a duct intermediate portion 13, and a duct lower end portion 14. The upper end portion 12 of the duct has an outer intake port 20 that opens outward in the vehicle width direction and a rear intake port 21 that opens rearward, and is inside the vehicle width direction from the outer intake port 20 and the rear intake port 21. The upper end flow path 15 is partitioned inside. The duct intermediate portion 13 has an upper end opening (not shown) communicating with the duct upper end portion 12 at the upper portion on the outer side in the vehicle width direction, extends in the vertical direction, and takes in air from the upper end passage 15 of the duct upper end portion 12. The intermediate flow path 16 that guides downward is partitioned inside. The duct lower end portion 14 has a duct annular portion 18 (intermediate annular portion) extending downward from the lower end of the duct intermediate portion 13, and a duct connecting portion (second connecting portion) 19 provided with a lower end opening 23 that opens downward. Then, the lower end flow path 17 that guides the intake air from the intermediate flow path 16 of the duct intermediate portion 13 to the lower end opening 23 is internally partitioned. The duct annular portion 18 and the duct connecting portion 19 include a pair of front and rear linear portions 24 facing each other, and a pair of left and right curved linear portions 25 connecting one ends and the other ends of the front and rear linear portions 24. The duct annular portion 18 is provided with a protruding portion 9 over the entire circumference. A flange portion 26 that projects outward in the radial direction is formed on the outer peripheral surface of the lower end portion of the duct connection portion 19. A bellows-shaped duct 7 continuous with the air cleaner 4 below the cab 2 is connected to the lower end opening 23.

As shown in FIGS. 3 to 5, the protruding portion 9 is provided over the entire circumference of the duct annular portion 18 of the vertical duct 6, and the bellows-shaped duct 7 is fastened to the vertical duct 6 by a clamp 8 described later. The band upper region 27 arranged in the rear linear portion 24b and the left and right curved linear portions 25 and the housing upper region 28 arranged in the front linear portion 24a are connected in a duct connected state. Have one. On the outer peripheral surface of the band upper region 27, a reverse tapered inclined surface 29 that inclines downward in the radial direction is formed.

The housing upper region 28 projects forward from the front linear portion 24a. On the upper surface of the housing upper region 28, the flow direction of the water flowing down along the outer surface of the vertical duct 6 toward the housing 51 of the clamp 8 described later is changed to both sides in the circumferential direction of the duct annular portion 18 separated from the housing 51. A guide surface 30 is provided. The guide surface 30 has a left inclined guide surface 30a that inclines diagonally downward to the left toward the left side in the circumferential direction of the duct annular portion 18 and a duct annular portion so that the portion above the housing 51 is at the apex in the duct connected state. It has a right-side inclined guide surface 30b that inclines diagonally downward to the right toward the right side in the circumferential direction of 18. The left lower end of the left inclined guide surface 30a extends to the vicinity of the right end of the inclined surface 29a of the left curved linear portion 25a, and the right lower end of the right inclined guide surface 30b is the inclined surface 29b of the right curved linear portion 25b. It extends to the vicinity of the left end of. The guide surface 30 extends without being inclined in the radial direction, and the water flowing down along the outer surface of the vertical duct 6 toward the housing 51 is provided by the left inclined guide surface 30a and the right inclined guide surface 30b. , The guide is guided to the vicinity of the right end of the inclined surface 29a of the curved linear portion 25a on the left side and the vicinity of the left end of the inclined surface 29b of the curved linear portion 25b on the right side.

The resonator portion 11 is formed in a container shape in which a resonator space (not shown) is partitioned inside and the openings other than the internal opening 32 are sealed. The resonator portion 11 is arranged outside the duct intermediate portion 13 of the duct main body portion 10 in the vehicle width direction and below the duct upper end portion 12. The intermediate flow path 16 of the duct intermediate portion 13 and the resonator space of the resonator portion 11 are separated by a rib 33 extending in the vehicle width direction, and communicate with each other by an internal opening 32 formed in the rib 33. The resonator section 11 reduces the sound pressure of the intake sound when the intake air flows through the vertical duct 6 by a resonance action.

The intake air sucked from the outer intake port 20 and the rear intake port 21 flows through the upper end flow path 15 of the duct upper end portion 12, the middle portion flow path 16 of the duct intermediate portion 13, and the lower end flow path 17 of the duct lower end portion 14. Then, it is guided to the bellows duct 7 side.

The bellows-shaped duct 7 has an elongated cylindrical shape in which an upper end connecting portion (first connecting portion) 34 having an upper end opening 37 that opens upward and a lower end opening (not shown) that opens downward are formed. A bellows-shaped duct line that has a bellows-shaped bellows portion 36 arranged between the upper end connecting portion 34 and the lower end connecting portion 35, and extends in the vertical direction to allow intake air to flow inward. 39 is partitioned. The bellows-shaped duct 7 is made of flexible resin or rubber. The inner peripheral surface of the upper end connecting portion 34 has an inner peripheral surface slightly larger than the oval shape of the outer peripheral surface of the duct connecting portion 19 of the vertical duct 6.

The duct connection portion 19 of the vertical duct 6 is connected to the upper end opening 37 of the upper end connection portion 34. The lower end opening of the lower end connecting portion 35 communicates with the air cleaner 4 on the chassis side in the non-tilted state, the air outside the vehicle interior is sucked by the air cleaner 4 through the vertical duct 6, and is separated from the air cleaner 4 side in the tilted state. A vertical duct 6 is inserted into the inner peripheral surface of the upper end connecting portion 34 to a position where the upper end surface of the upper end connecting portion 34 of the bellows-shaped duct 7 abuts on the lower surface of the protruding portion 9 of the vertical duct 6. A positioning groove 40 is formed in which the flange portion 26 of the duct lower end portion 14 of the duct 6 is engaged. A clamp arrangement groove 41 in which a clamp 8 described later is arranged is provided on the outer peripheral surface of the upper end connection portion 34. The groove width of the clamp arrangement groove 41 is formed to be slightly wider than the width of the band 50 of the clamp 8.

The inner diameter of the upper end connecting portion 34 in the vehicle width direction (the distance from the inner peripheral surface of the upper end connecting portion 34 on the left side in the vehicle width direction to the inner peripheral surface of the opposite upper end connecting portion 34 in the vehicle width direction) is the vertical duct 6. Set slightly larger than the outer diameter of the duct connection portion 19 in the vehicle width direction (distance from the inner peripheral surface of the duct connection portion 19 on the left side in the vehicle width direction to the inner peripheral surface of the opposite duct connection portion 19 in the vehicle width direction). The inner diameter of the upper end connecting portion 34 in the front-rear direction (the distance from the inner peripheral surface in front of the upper end connecting portion 34 to the inner peripheral surface behind the facing upper end connecting portion 34) is the duct connecting portion of the vertical duct 6. It is set to be slightly larger than the outer diameter of 19 in the front-rear direction (the distance from the inner peripheral surface in front of the duct connecting portion 19 to the inner peripheral surface behind the duct connecting portion 19 facing the duct connection portion 19).

The clamp 8 is arranged in a clamp arrangement groove 41 formed on the outer peripheral surface of the upper end connecting portion 34 of the bellows-shaped duct 7, and includes a band 50 and a housing 51. The housing 51 has a housing body 53 in which a band insertion hole (not shown) is formed through the band 50 in the circumferential direction, and a tightening bolt 54 for winding the band 50 inserted through the band insertion hole. And have. The band 50 is a band-shaped member extending from one end edge in the circumferential direction of the housing 51, and the tip edge thereof is inserted into the band insertion hole from the other end side in the circumferential direction of the housing 51 to form an annular shape. The length of the long side of the band 50 is set longer than the length of the outer circumference of the bellows duct 7, and the inner diameter of the ring shape formed by the band 50 in the initial state is larger than the outer diameter of the upper end connecting portion 34 of the bellows duct 7. big. The ring shape formed by the band 50 is reduced in diameter from the initial state by rotating the tightening bolt 54 in the tightening direction and winding the band 50 from the other end side to one end side of the band insertion hole. ..

Next, the work of tightening and connecting the bellows duct 7 to the vertical duct 6 by the clamp 8 will be described.

When connecting the bellows-shaped duct 7 to the vertical duct 6, first, the clamp 8 is attached to the bellows-shaped duct 7. When attaching the clamp 8 to the bellows-shaped duct 7, the upper end connecting portion 34 of the bellows-shaped duct 7 is inserted inside the ring shape of the band 50 in the initial state, and the band 50 is inserted into the outer periphery of the clamp arrangement groove 41 of the upper end connecting portion 34. Place on the surface. Next, the duct connection portion 19 of the vertical duct 6 is inserted into the upper end opening 37 of the upper connection portion 34 of the bellows-shaped duct 7. The vertical duct 6 is inserted to a position where the upper end surface of the upper end connecting portion 34 of the bellows-shaped duct 7 abuts on the lower surface of the protruding portion 9 of the vertical duct 6. The inner circumference of the upper end connecting portion 34 of the bellows-shaped duct 7 with the vertical duct 6 inserted to a position where the upper end surface of the upper end connecting portion 34 of the bellows-shaped duct 7 abuts on the lower surface of the protruding portion 9 of the vertical duct 6. The upper surface of the flange portion 26 of the duct lower end portion 14 of the vertical duct 6 comes into contact with the upper surface of the positioning groove 40 formed on the surface. The connection position of the bellows-shaped duct 7 with respect to the vertical duct 6 is determined by the contact between the upper end surface of the upper end connecting portion 34 and the lower surface of the protruding portion 9 and the contact between the upper surface of the positioning groove 40 and the upper surface of the flange portion 26. Positioned in position. Finally, by rotating the tightening bolt 54 of the housing 51 in the tightening direction, the band 50 is wound from the other end side to one end side, and the ring shape of the band 50 is reduced in diameter from the initial state. The inner peripheral surface of the band 50 tightens the outer peripheral surface of the upper end connecting portion 34 of the bellows-shaped duct 7 positioned at the connection position by reducing the diameter of the ring shape of the band 50, and the bellows-shaped duct 7 is tightened by tightening the clamp 8. It is tightened to the vertical duct 6.

In the connection structure of the flow path forming member configured as described above, the upper end connecting portion 34 of the bellows-shaped duct 7 is projected from the outside of the duct lower end portion 14 of the vertical duct 6 in a duct connected state tightened by the clamp 8. The portion 9 has a housing upper region 28 that is located above the housing 51. The upper surface of the housing upper region 28 is a guide surface that changes the flow direction of water flowing down along the outer surface of the vertical duct 6 toward the housing 51 toward both sides of the duct annular portion 18 detached from the housing 51 in the circumferential direction. Since it is 30, it is possible to prevent water from splashing on the housing 51, and it is possible to suppress rusting of the housing 51.

Further, the guide surface 30 is a left and right inclined surface 29 that inclines diagonally downward toward both sides in the circumferential direction of the duct annular portion 18. Therefore, the water flowing down along the outer surface of the vertical duct 6 toward the housing 51 is guided diagonally downward along the left-right inclination of the guide surface 30. Therefore, it is possible to more reliably suppress water splashing on the housing 51.

Further, the housing upper region 28 protrudes outward in the radial direction from the linear portion 24a in front of the oval cross-sectional shape of the duct annular portion 18, and becomes the left lower end of the left inclined surface 29a and the right lower end of the right inclined surface 29b. Extend to the vicinity of both ends of the front linear portion 24a. Therefore, of the water flowing down along the outer surface of the vertical duct 6, the water flowing down toward the upper end connecting portion 34 below the linear portion 24 where the tightening force by the clamp 8 is low is tightened by the clamp 8. It can be guided to the upper end connecting portion 34 below the curved linear portion 25 where the force is increased. Therefore, it is possible to suppress water splashing on the upper end connecting portion 34 below the linear portion 24 in which the tightening force of the clamp 8 is reduced, and it is possible to suppress the ingress of water into the intake pipe 3.

In the present embodiment, a structure in which a bellows-shaped bellows portion 36 is provided between the upper end connecting portion 34 and the lower end connecting portion 35 of the bellows-shaped duct 7 is exemplified, but the present invention is not limited to this. , A long cylindrical tubular portion may be provided.

Further, the left side inclined guide surface 30a that inclines diagonally downward to the left toward the left side in the circumferential direction of the duct annular portion 18 and the circumference of the duct annular portion 18 so that the portion above the housing 51 in the duct connected state becomes the apex. A structure is exemplified in which a guide surface 30 having a right side inclined guide surface 30b that inclines diagonally downward to the right toward the right side in the direction is provided on the upper surface of the housing upper region 28, but is not limited thereto. .. For example, as shown in FIG. 6, a guide surface 61 that inclines outward in the radial direction and extends in the circumferential direction of the duct annular portion 18 projects forward from the linear portion 24a in front of the duct annular portion 18. The structure may be provided on the upper surface of the housing upper region 60. Further, as shown in FIG. 7, the circumference of the duct annular portion 18 is projected forward in a flat plate shape from the linear portion 24a in front of the duct annular portion 18 so that the portion above the housing 51 in the duct connected state becomes the apex. A structure may be provided in which a guide surface 63 extending in the circumferential direction of the duct annular portion 18 without being inclined in the radial direction is provided on the upper surface of the housing upper region 62 that is inclined toward both sides in the direction.

Further, in the present embodiment, the connection structure of the flow path forming member is applied to the connection of the intake pipe 3 that circulates the air sucked from the outer intake port 20 and the rear intake port 21 to the air cleaner 4, but is limited to this. It's not something. For example, it may be applied to the connection of the exhaust pipe.

Although the present invention has been described above based on the above-described embodiment, the present invention is not limited to the contents of the above-described embodiment, and can be appropriately modified without departing from the present invention. That is, it goes without saying that all other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are included in the category of the present invention.

The connection structure of the flow path forming member of the present invention can be widely used for trucks and other vehicles.

1 Vehicle 2 Cab 2a Rear surface of cab 3 Intake piping (flow path forming member)
6 Vertical duct (second flow path forming member)
7 Bellows-shaped duct (first flow path forming member)
8 Clamp 9 Protruding part 10 Duct body part 12 Duct upper end part 13 Duct middle part 14 Duct lower end part 18 Duct ring part (intermediate ring part)
19 Duct connection (second connection)
20 Outer intake port 21 Rear intake port 24 Straight part 24a Front straight part 25 Curved linear part 27 Band upper area 28,60,62 Housing upper area 29 Inclined surface 30,61,63 Guide surface 34 Upper end connection part ( 1st connection)
35 Lower end connection 36 Bellows 50 Band 51 Housing

Claims (3)

A first flow path forming member having an elastic tubular first connection portion that opens upward,
A tubular second connecting portion inserted into the inside of the first connecting portion from above, an intermediate annular portion above the second connecting portion, and at least a part of the intermediate annular portion projecting outward in the radial direction. A second flow path forming member having a protruding portion,
A clamp having a band extending in an annular shape along the outer peripheral surface of the first connection portion and a housing provided at one end of the band and having a housing for reducing the diameter of the band by winding the other end of the band is provided. ,
The protruding portion has a housing upper region arranged above the housing in a member connected state in which the first connecting portion is clamped from the outside of the second connecting portion by the clamp.
The upper surface of the housing upper region is one side or both sides in the circumferential direction of the intermediate annular portion deviated from the housing in the flow direction of water flowing down toward the housing along the outer surface of the second flow path forming member. A connection structure of a flow path forming member, which is a guide surface that changes toward. The connection structure of the flow path forming member according to claim 1.
The guide surface is a connecting structure of a flow path forming member, which is an inclined surface that inclines diagonally downward toward one side or both sides in the circumferential direction of the intermediate annular portion. The connection structure of the flow path forming member according to claim 1.
The cross-sectional shape of the intermediate annular portion is an oval shape in which one ends and the other ends of a pair of linear portions facing each other are continuous via a pair of curved linear portions.
The housing upper region projects radially outward from one of the pair of linear portions.
The guide surface is a connecting structure of a flow path forming member, characterized in that the guide surface is a left and right inclined surface that is inclined obliquely downward toward both sides in the circumferential direction of the intermediate annular portion.

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