阅读说明：本技术 流路形成部件的连接构造 (Connection structure of flow passage forming member ) 是由 加茂重树 后藤健二 于 2018-05-30 设计创作，主要内容包括：第二连接部从上方插入到向上方开口的第一连接部(34)的内侧。突状部(9)从中间环状部(18)的至少一部分向径向外侧突出。夹具(8)的壳体(51)通过设于带(50)的一端并卷绕带(50)的另一端而使带(50)缩径。突状部(9)在第一连接部(34)被夹具(8)从第二连接部的外侧紧固的连接状态下,具有位于壳体(51)的上方的壳体上方区域(28)。壳体上方区域(28)的上表面是将朝向壳体(51)并沿第二流路形成部件(6)的外表面流下的水的流下方向,变更为朝向从壳体(51)的分离的中间环状部(18)的周向的一侧或两侧的引导面(30)。(The second connecting portion is inserted from above into the inside of the first connecting portion (34) which opens upward. The projecting portion (9) projects radially outward from at least a part of the intermediate annular portion (18). A case (51) of the jig (8) is provided at one end of the tape (50) and winds the other end of the tape (50) to reduce the diameter of the tape (50). The projecting portion (9) has a housing upper region (28) located above the housing (51) in a connected state in which the first connecting portion (34) is fastened by the jig (8) from the outside of the second connecting portion. The upper surface of the housing upper region (28) is a guide surface (30) which changes the flow direction of water flowing down along the outer surface of the second flow path forming member (6) toward the housing (51) to one or both sides in the circumferential direction of the intermediate annular portion (18) separated from the housing (51).)

1. A connection structure of flow path forming members, comprising:

a first flow path forming member having an elastic cylindrical first connecting portion opening upward,

a second flow path forming member having a cylindrical second connecting portion inserted from above into the first connecting portion, an intermediate annular portion above the second connecting portion, a projecting portion projecting radially outward from at least a part of the intermediate annular portion, and

a jig having a band extending annularly along an outer peripheral surface of the first connecting portion, and a case provided at one end of the band and around which the other end of the band is wound to reduce the diameter of the band;

the projecting portion has a housing upper region located above the housing in a connected state where the first connecting portion is fastened by the jig from an outside of the second connecting portion;

the upper surface of the housing upper region is a guide surface that changes a flow-down direction of water flowing down toward the housing and along the outer surface of the second flow passage forming member to one side or both sides in the circumferential direction of the intermediate annular portion separated from the housing.

2. The connection structure of flow path forming members according to claim 1,

the guide surface is an inclined surface inclined obliquely downward toward one side or both sides of the intermediate annular portion in the circumferential direction.

3. The connection structure of flow path forming members according to claim 1,

the cross-sectional shape of the intermediate annular portion is an elliptical shape in which one end and the other end of a pair of opposing linear portions are continuous via a pair of curved linear portions;

the housing upper region protrudes radially outward from one of the pair of linear portions;

the guide surface has a left inclined surface inclined obliquely downward toward a left side in a circumferential direction of the intermediate annular portion and a right inclined surface inclined obliquely downward toward a right side in the circumferential direction of the intermediate annular portion, a left lower end of the left inclined surface extends to a vicinity of a left end of the one linear portion, and a right lower end of the right inclined surface extends to a vicinity of a right end of the one linear portion.

Technical Field

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

Background

Patent document 1 describes an intake duct for a flat-head vehicle, including: a breather pipe fixed to a rear wall of the cab as an intake duct; and a corrugated upper elastic cylinder made of rubber integrally coupled to a lower portion of the vent pipe. The upper end of the upper elastic cylinder is fastened and fixed to the lower edge of the vent pipe by a belt. Further, the inner peripheral surface of the upper end portion of the upper elastic tube is inserted into the outer peripheral surface of the lower edge portion of the breather pipe from below.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese laid-open patent publication No. H09-144615

Disclosure of Invention

[ problems to be solved by the invention ]

However, in the structure described in patent document 1, the upper end portion of the first flow path forming member is fastened by a band (jig) in a state where the upper end portion of the upper elastic cylindrical body (first flow path forming member) is inserted from below into the outer peripheral surface of the lower edge portion of the breather pipe (second flow path forming member), thereby connecting the second flow path forming member and the first flow path forming member. Therefore, water flowing down along the outer peripheral surface of the second flow passage forming member may splash on the housing of the jig, and rust may be generated in the housing.

Accordingly, an object of the present disclosure is to provide a connection structure of flow path forming members that can suppress rusting of a casing by making it difficult for water to splash onto the casing.

[ means for solving the problems ]

To achieve the above object, a connection structure of a flow passage forming member includes a first flow passage forming member, a second flow passage forming member, and a jig. The first flow path forming member has an elastic tubular first connecting portion that opens upward. The second flow path forming member has: the second connecting portion is inserted into the cylindrical second connecting portion from above, and the intermediate annular portion above the second connecting portion is a projecting portion projecting radially outward from at least a part of the intermediate annular portion. The clamp has: the band extends annularly along the outer peripheral surface of the first connecting portion, and the case is provided at one end of the band and winds the other end of the band to reduce the diameter of the band.

The "elastic cylindrical first connecting portion" referred to herein means that the first connecting portion is cylindrical and is elastically deformable.

The projecting portion has a housing upper region located above the housing in a connected state where the first connecting portion is fastened by a jig from outside the second connecting portion. The upper surface of the housing upper region is a guide surface that changes the flow direction of water flowing down toward the housing and along the outer surface of the second flow path forming member to one side or both sides in the circumferential direction of the intermediate annular portion separated from the housing.

In the above configuration, in a connected state where the first connecting portion is fastened by the jig from the outside of the second connecting portion, the projecting portion has a housing upper region located above the housing. Since the upper surface of the upper region of the casing is a guide surface that changes the flow direction of the water flowing down toward the casing and along the outer surface of the second flow path forming member to one side or both sides in the circumferential direction of the intermediate annular portion separated from the casing, the water can be made less likely to splash into the casing, and rust formation of the casing can be suppressed.

The guide surface may be an inclined surface inclined obliquely downward toward one side or both sides of the intermediate annular portion in the circumferential direction.

In the above configuration, the guide surface is an inclined surface inclined obliquely downward toward one side or both sides in the circumferential direction of the intermediate annular portion. Therefore, the water remaining along the outer surface of the second flow passage forming member toward the housing is guided obliquely downward along the inclination of the guide surface. Therefore, the splashing of water to the case can be more reliably suppressed.

The intermediate annular portion may have an elliptical cross-sectional shape in which one end and the other end of the pair of linear portions facing each other are continuous with each other through the pair of curved linear portions. The housing upper region protrudes radially outward from one of the pair of linear portions. The guide surface has a left inclined surface inclined obliquely downward toward the left side in the circumferential direction of the intermediate annular portion and a right inclined surface inclined obliquely downward toward the right side in the circumferential direction of the intermediate annular portion, a left lower end of the left inclined surface extends to the vicinity of the left end of the one linear portion, and a right lower end of the right inclined surface extends to the vicinity of the right end of the one linear portion.

In the above configuration, the guide surface has a left inclined surface inclined obliquely downward toward the left side in the circumferential direction of the intermediate annular portion and a right inclined surface inclined obliquely downward toward the right side in the circumferential direction of the intermediate annular portion. Therefore, water flowing down along the outer surface of the second flow passage forming member toward the housing is guided obliquely downward along the right and left inclinations of the guide surface. Therefore, the splashing of water to the case can be more reliably suppressed.

Further, one of a pair of linear portions having an elliptical cross-sectional shape of the intermediate annular portion protrudes outward in the radial direction of the housing upper region, the left lower end of the left inclined surface extends to the vicinity of the left end of the one linear portion, and the right lower end of the right inclined surface extends to the vicinity of the right end of the one linear portion. Therefore, among the water flowing down along the outer surface of the second flow path formation member, the water flowing down toward the first connection portion below the linear portion where the fastening force by the clip becomes low can be guided to the first connection portion below the curved linear portion where the fastening force by the clip becomes high. Therefore, it is possible to suppress water from splashing to the first connection portion below the linear portion having a low fastening force by the clip, and to suppress water from entering the flow passage forming member.

Effects of the invention

According to the present disclosure, rust of the case can be suppressed by making it difficult for water to splash to the case.

Drawings

Fig. 1 is a perspective view showing a vehicle having a connection structure of a flow passage forming member according to an embodiment of the present disclosure.

Fig. 2 is a front view showing an intake pipe.

Fig. 3 is an enlarged view of a main portion of the intake pipe of fig. 2.

Fig. 4 is an IV-IV sectional view of fig. 3.

Fig. 5 is a view in section from V to V of fig. 4.

Fig. 6 is a cross-sectional view showing a modification of the projecting portion.

Fig. 7 is a cross-sectional view showing another modification of the projection.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. IN each drawing, FR denotes a front of the vehicle, UP denotes an upper side, and IN denotes a vehicle width direction inner side. In the following description, the left-right direction means a left-right direction in a state where the vehicle is facing forward.

As shown in fig. 1, the connection structure of the flow passage forming member of the present embodiment is suitable for connection of an intake pipe (flow passage forming member) 3 for circulating intake air to an air cleaner 4. The vehicle 1 provided with the intake pipe 3 is a tractor 1 towing a trailer (not shown), and the cab 2 is located above front portions of a pair of left and right side sills (not shown) extending in the front-rear range of the tractor 1. The cab 2 is supported so that the front end side of the cab 2 is tiltable about a tilt axis (not shown) with respect to the chassis side, and is supported from below to the side members by a plurality of cab mounts (not shown) in a non-tilt state. An engine (not shown) is located at the center in the vehicle width direction below cab 2. A connector (カプ ラ)5, which is a connection device for coupling the trailer to the tractor 1, is located above the rear of the side beams. Intake pipe 3 is a duct for circulating intake air to the engine, is disposed rearward of an outer end portion of rear surface 2a of cab 2 on the right side in the vehicle width direction, is fixed to rear surface 2a of cab 2 in a state of extending in the vertical direction along rear surface 2a of cab 2, and includes vertical duct (second flow passage forming member) 6, corrugated duct (first flow passage forming member) 7, and jig 8.

As shown in fig. 2 to 4, the vertical duct 6 is a resin duct, and integrally includes: a duct body 10 that defines an internal flow path (an upper end flow path 15, an intermediate flow path 16, and a lower end flow path 17 described later) that extends continuously from an upper outer intake port 20 and a rear intake port 21 to a lower end opening 23 at a lower end; and a resonator portion 11 separated from the duct body portion 10 by a rib 33. The vertical duct 6 is formed to have a thin thickness in the front-rear direction so as not to protrude greatly rearward of the cab 2.

The duct body 10 has a duct upper end portion 12, a duct intermediate portion 13, and a duct lower end portion 14. The duct upper end portion 12 has an outer intake port 20 that opens outward in the vehicle width direction and a rear intake port 21 that opens rearward, extends inward in the vehicle width direction from the outer intake port 20 and the rear intake port 21, and defines an upper end portion flow passage 15 therein. The duct intermediate portion 13 has an upper end opening (not shown) communicating with the duct upper end portion 12 at an upper portion on the vehicle width direction outer side, extends in the vertical direction, and internally defines an intermediate flow passage 16 that guides the intake air from the upper end flow passage 15 of the duct upper end portion 12 downward. The duct lower end portion 14 includes 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 opening downward, and internally defines a lower end portion flow passage 17 that guides the intake air from the intermediate flow passage 16 of the duct intermediate portion 13 to the lower end opening 23. The pipe ring portion 18 and the pipe connecting portion 19 are formed in an elliptical shape having 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 end and the other end of the front and rear linear portions 24, and the pipe ring portion 18 is provided with the projecting portions 9 over the entire circumference. A flange portion 26 protruding radially outward is formed on the outer peripheral surface of the lower end portion of the pipe connecting portion 19. A corrugated duct 7 continuous to the air cleaner 4 below the cab 2 is connected to the lower end opening 23.

As shown in fig. 3 to 5, the projecting portion 9 is provided over the entire circumference of the pipe loop portion 18 of the vertical pipe 6, and integrally includes an upper band region 27 having a straight line portion 24b located rearward and a curved line portion 25 located right and left, and an upper case region 28 having a straight line portion 24a located forward, in a pipe connection state in which the corrugated pipe 7 is fastened and connected to the vertical pipe 6 by a clamp 8 described later. An inclined surface 29 having a reverse taper shape is formed on the outer peripheral surface of the belt upper region 27 so as to be inclined downward and radially outward.

The housing upper region 28 protrudes forward from the forward linear portion 24 a. Guide surfaces 30 are provided on the upper surface of the housing upper region 28, and the guide surfaces 30 change the flow direction of water flowing down along the outer surface of the vertical pipe 6 toward the housing 51 of the jig 8 described later to both sides in the circumferential direction of the pipe annular portion 18 separated from the housing 51. The guide surface 30 has a left inclined guide surface 30a inclined obliquely leftward and downward to the left of the pipe annular portion 18 in the circumferential direction and a right inclined guide surface 30b inclined obliquely rightward and downward to the right of the pipe annular portion 18 in the circumferential direction so that a portion corresponding to the upper portion of the housing 51 is at an apex in the pipe connected state. 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 extends to the vicinity of the left end of the inclined surface 29b of the right curved linear portion 25 b. The guide surface 30 extends without being inclined with respect to the radial direction, and water flowing down along the outer surface of the vertical pipe 6 toward the housing 51 is guided by the left inclined guide surface 30a and the right inclined guide surface 30b to the vicinity of the right end of the inclined surface 29a of the left curved linear portion 25a and the vicinity of the left end of the inclined surface 29b of the right curved linear portion 25 b.

The resonator portion 11 defines a resonator space (not shown) therein, and is formed in a closed container shape except for the internal opening 32. The resonator portion 11 is located on the vehicle width direction outer side of the duct intermediate portion 13 of the duct main body portion 10 and below the duct upper end portion 12. The intermediate flow passage 16 of the duct intermediate portion 13 and the resonator space of the resonator portion 11 are partitioned by a rib 33 extending so as to intersect the vehicle width direction, and communicate with each other through an internal opening 32 formed in the rib 33. The resonator portion 11 reduces the sound pressure of intake air sound when intake air flows through the vertical duct 6 by resonance action.

The intake air sucked from the outer intake port 20 and the rear intake port 21 flows through the upper end flow passage 15 of the duct upper end portion 12, the intermediate flow passage 16 of the duct intermediate portion 13, and the lower end flow passage 17 of the duct lower end portion 14, and is guided toward the corrugated duct 7.

The corrugated duct 7 includes an elongated cylindrical upper end connecting portion (first connecting portion) 34 having an upper end opening 37 which opens upward, an elongated cylindrical lower end connecting portion 35 having a lower end opening (not shown) which opens downward, and a corrugated portion 36 located between the upper end connecting portion 34 and the lower end connecting portion 35, and a corrugated duct line 39 which extends in the vertical direction and divides the intake air flow inside. The serpentine 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 elliptical shape of the outer peripheral surface of the pipe connecting portion 19 of the vertical pipe 6.

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

The vehicle-width-direction inner diameter of the upper end connecting portion 34 (the distance from the vehicle-width-direction left inner circumferential surface of the upper end connecting portion 34 to the vehicle-width-direction right inner circumferential surface of the opposite upper end connecting portion 34) is set slightly larger than the vehicle-width-direction outer diameter of the duct connecting portion 19 of the vertical duct 6 (the distance from the vehicle-width-direction left inner circumferential surface of the duct connecting portion 19 to the vehicle-width-direction right inner circumferential surface of the opposite duct connecting portion 19), and the front-rear-direction inner diameter of the upper end connecting portion 34 (the distance from the front inner circumferential surface of the upper end connecting portion 34 to the rear inner circumferential surface of the opposite upper end connecting portion 34) is set slightly larger than the front-rear-direction outer diameter of the duct connecting portion 19 of the vertical duct 6 (the distance.

The jig 8 is disposed in a jig disposition groove 41 formed in an outer peripheral surface of the upper end connection portion 34 of the corrugated pipe 7, and includes a belt 50 and a housing 51. The housing 51 has: the case body 53 is formed with a band insertion hole (not shown) that penetrates in the circumferential direction and through which the band 50 is inserted, and a fastening bolt 54 that winds the band 50 inserted through the band insertion hole. The belt 50 is a belt-like member extending from one circumferential end edge of the housing 51, and a front end edge thereof is inserted into the belt insertion hole from the other circumferential end side of the housing 51, and is formed in a ring shape. The length of the long side of the band 50 is set to be longer than the length of the outer periphery of the corrugated tube 7, and the inner diameter of the loop formed by the band 50 in the initial state is larger than the outer diameter of the upper end connecting portion 34 of the corrugated tube 7. The band 50 is formed in a ring shape, and the fastening bolt 54 is rotated in the fastening direction, whereby the band 50 is wound from the other end side to one end side of the band insertion hole, and the diameter is reduced from the initial state.

Next, the operation of fastening and connecting the corrugated pipe 7 to the vertical pipe 6 by the clamp 8 will be described.

When the corrugated pipe 7 is connected to the vertical pipe 6, first, the clamp 8 is attached to the corrugated pipe 7. When the clip 8 is attached to the corrugated pipe 7, the upper end connecting portion 34 of the corrugated pipe 7 is inserted through the ring-shaped inner side of the band 50 in the initial state, and the band 50 is disposed on the outer peripheral surface of the clip disposing groove 41 of the upper end connecting portion 34. Next, the pipe connecting portion 19 of the vertical pipe 6 is inserted into the upper end opening 37 of the upper connecting portion 34 of the corrugated pipe 7. The vertical duct 6 is inserted to a position where the upper end surface of the upper end connecting portion 34 of the corrugated duct 7 abuts against the lower surface of the projecting portion 9 of the vertical duct 6. In a state where the vertical duct 6 is inserted to a position where the upper end surface of the upper end connecting portion 34 of the corrugated duct 7 abuts against the lower surface of the projecting portion 9 of the vertical duct 6, the upper surface of the positioning groove 40 forming the inner peripheral surface of the upper end connecting portion 34 of the corrugated duct 7 abuts against the upper surface of the flange portion 26 of the duct lower end portion 14 of the vertical duct 6. The upper end surface of the upper end connecting portion 34 abuts against the lower surface of the projecting portion 9 and the upper surface of the positioning groove 40 abuts against the upper surface of the flange portion 26, whereby the position of connection of the corrugated pipe 7 to the vertical pipe 6 is positioned at a predetermined position. Finally, the fastening bolt 54 of the housing 51 is rotated in the fastening direction, whereby the band 50 is wound from the other end side to the one end side, and the loop shape of the band 50 is reduced from the initial state. By reducing the diameter of the band 50 in a ring shape, the outer peripheral surface of the upper end connecting portion 34 of the corrugated pipe 7 positioned at the connecting position is fastened to the inner peripheral surface of the band 50, and the corrugated pipe 7 is fastened to the vertical pipe 6 by fastening the clamp 8.

In the above-described connection structure of the flow passage forming member, the projecting portion 9 has the housing upper region 28 located above the housing 51 in the duct connection state in which the upper end connecting portion 34 of the corrugated duct 7 is fastened by the clamp 8 from the outside of the duct lower end portion 14 of the vertical duct 6. Since the upper surface of the housing upper region 28 is the guide surface 30 that changes the flow direction of the water flowing down toward the housing 51 along the outer surface of the vertical duct 6 to the two sides in the circumferential direction of the duct annular portion 18 separated from the housing 51, the water can be made less likely to splash into the housing 51, and rust formation of the housing 51 can be suppressed.

The guide surface 30 has left and right inclined surfaces 29 inclined obliquely downward toward both sides in the circumferential direction of the pipe annular portion 18. Therefore, the water flowing down along the outer surface of the vertical duct 6 toward the housing 51 is guided obliquely downward along the right and left inclinations of the guide surface 30. Therefore, the splashing of water to the housing 51 can be more reliably suppressed.

The case upper region 28 projects radially outward from the front linear portion 24a of the oval cross-sectional shape of the duct annular portion 18, and the left lower end of the left inclined surface 29a extends to the vicinity of the left end of the front linear portion 24a, and the right lower end of the right inclined surface 29b extends to the vicinity of the right end of the front linear portion 24 a. Therefore, among the water flowing down along the outer surface of the vertical duct 6, the water flowing down toward the upper end connection portion 34 below the linear portion 24, the tightening force of which is reduced by the clamp 8, is guided to the upper end connection portion 34 below the curved linear portion 25, the tightening force of which is increased by the clamp 8. Therefore, water is prevented from splashing on the upper end connecting portion 34 below the linear portion 24 having a low tightening force by the clamp 8, and water can be prevented from entering the intake pipe 3.

In the present embodiment, the corrugated bellows 36 is provided between the upper end connecting portion 34 and the lower end connecting portion 35 of the corrugated pipe 7, but the present invention is not limited thereto, and a long cylindrical portion may be provided.

Further, the guide surface 30 having the left inclined guide surface 30a inclined obliquely leftward and downward toward the left side in the circumferential direction of the pipe annular portion 18 and the right inclined guide surface 30b inclined obliquely rightward and downward toward the right side in the circumferential direction of the pipe annular portion 18 is provided on the upper surface of the housing upper region 28 so that the portion corresponding to the upper portion of the housing 51 is at the apex in the pipe connected state, but the present invention is not limited thereto. For example, as shown in fig. six, a guide surface 61 inclined radially outward toward the upper side and extending in the circumferential direction of the pipe annular portion 18 may be provided on the upper surface of the housing upper region 60 protruding forward from the linear portion 24a in front of the pipe annular portion 18. As shown in fig. 7, the pipe may be configured such that a linear portion 24a in front of the pipe annular portion 18 protrudes forward in a flat plate shape, and a guide surface 63 extending in the circumferential direction of the pipe annular portion 18 without inclining with respect to the radial direction is provided on the upper surface of a case upper region 62 inclining to both sides in the circumferential direction of the pipe annular portion 18 so that an upper portion corresponding to the case 51 in the pipe connected state becomes an apex.

In the present embodiment, the connection structure of the flow path forming member is applied to the connection of the intake pipe 3 for circulating the air sucked from the outer air inlet 20 and the rear air inlet 21 to the air cleaner 4, but is not limited thereto. For example, the present invention can also be applied to connection of exhaust pipes.

The present disclosure has been described above based on the above embodiments, but the present disclosure is not limited to the contents of the above embodiments, and it goes without saying that the present disclosure can be appropriately modified within a range not departing from the scope of the present disclosure. That is, it is obvious that other embodiments, examples, operation techniques, and the like, which are completed based on the present embodiment by those skilled in the art, are all included in the scope of the present disclosure.

The present application is based on the japanese patent application published on 31/05/2017 (japanese patent application 2017-108837), the content of which is hereby incorporated by reference.

[ Industrial availability ]

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

[ description of reference numerals ]

1 vehicle

2 driver's cabin

2a cab rear surface

3 air inlet pipe (flow passage forming component)

6 vertical pipe (second flow path forming part)

7 corrugated pipe (first flow path forming part)

8 clamp (クラン プ)

9 projecting part

10 duct body

12 upper end of pipeline

13 middle part of pipeline

14 lower end of pipeline

18 pipe ring (middle ring)

19 pipe connection (second connection)

20 outside air inlet

21 rear air inlet

24 linear part

Front linear part 24a

25 curved linear portion

27 area above belt (バン ド)

28. 60, 62 housing upper region

29 inclined plane

30. 61, 63 guide surfaces

34 upper end connecting part (first connecting part)

35 lower end connecting part

36 corrugated part

50 belt (バン ド)

51 casing