JP2019131070A - Intake structure - Google Patents

Abstract

To reduce a length of an intake passage at the upstream side of an air cleaner relative to an entire length of a cab in a vehicle in which the air cleaner is provided behind the cab disposed above an engine.SOLUTION: An intake structure IS according to one embodiment of a technology of the disclosure includes: an outer air introduction part 30 defined between a cab 18 and a tire 26 and having an opening 30a at an upstream side end part; and a duct member 22 having an opening 22a for taking outer air from the outer air introduction part 30 at its end part.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to an intake structure for introducing air into an engine mounted on a vehicle.

  Some cab-over type vehicles in which a cabin (cab) is disposed above an engine include an intake duct for introducing outside air into the engine. For example, there is a vehicle that includes an intake duct, i.e., a vertical duct, that is erected on the back surface behind the cab, and that has an air cleaner disposed behind the cab. However, providing the intake duct at the rear of the cab in this way leads to a reduction in the loading space behind the cab if the overall length of the vehicle is the same.

  On the other hand, if the intake duct is simply moved forward to secure the loading space, the cab space may be reduced. Therefore, for example, Patent Document 1 discloses an intake structure in a cab-over type vehicle in which an air cleaner is disposed behind a cab and below a loading platform, and is directed to securing a cab and a loading space behind the cab. In this intake structure, an introduction duct having an opening close to the grill at the foremost part of the vehicle is connected via an internal passage of the floor member of the cab on the upstream side of the intake duct for introducing outside air into the air cleaner.

JP 2007-168556 A

  However, in the intake structure of Patent Document 1, it is necessary to secure an intake passage on the upstream side of the air cleaner by the same length as the entire length of the cab. By lengthening the intake passage in this way, for example, there is a possibility that an increase in intake resistance may occur.

  Therefore, the technique of the present disclosure aims to shorten the length of the intake passage on the upstream side of the air cleaner with respect to the total length of the cab in a vehicle or the like in which an air cleaner is provided behind the cab disposed above the engine. And

  In order to achieve the above object, the technology of the present disclosure includes an outside air introduction section that is defined between a cab and a tire and has an opening at an upstream end, and an opening for taking outside air from the outside air introduction section. An air intake structure comprising a duct member having an end at the end.

  Preferably, the opening of the duct member is located above the tire.

  Preferably, a liner member is provided on the lower side of the lower side member of the cab so as to define the outside air introduction portion.

  Preferably, the opening of the outside air introduction portion is positioned on the vehicle front side with respect to the opening of the duct member.

  Preferably, the opening of the duct member is positioned above the opening of the outside air introduction portion.

  Preferably, the duct member is configured to be connected to an air cleaner, and the air cleaner is disposed below a body member disposed behind the cab.

  The intake structure according to the technology of the present disclosure has the above-described configuration. For example, in a vehicle in which a cab is provided above the engine and an air cleaner is provided behind the cab, the length of the intake passage on the upstream side of the air cleaner is increased. It becomes possible to make it relatively short.

It is a schematic structure figure of the front part of the cab over type vehicle provided with the air intake device to which the air intake structure concerning one embodiment in the art of this indication was applied, and is a figure showing the state where the cab was fixed to the regular position. It is a schematic block diagram of the front part of the cab over type vehicle of FIG. 1, and is a figure showing the place where the cab is in a forward tilted state. It is a schematic diagram for showing the position in the vehicle of the air cleaner and the duct member in the air intake apparatus of FIG. FIG. 4 is a partial schematic cross-sectional view of the intake device of FIG. 1 at a position along line IV-IV of FIG. 3.

  Hereinafter, embodiments according to the technology of the present disclosure will be described with reference to the accompanying drawings. The same parts (or configurations) are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated. Note that front and rear, left and right, and top and bottom in the embodiments described later are based on the vehicle in the state of FIG.

  The intake structure IS according to the present embodiment is applied to an intake device 10 for introducing outside air to an engine 14 (shown in FIG. 2) of a cab-over type vehicle 12 shown in FIGS. 1 and 2 are views of a front portion of the vehicle 12 as viewed from the right side of the vehicle. FIG. 1 shows a state where a cab 18 attached to the chassis frame 16 of the vehicle 12 is fixed at a normal position, and FIG. 2 shows a state where the cab 18 is tilted forward (tilt state). FIG. 3 is a view of the vehicle 12 in the state of FIG. 1 as viewed from above, and schematically shows the positional relationship of the air cleaner 20 and the duct member 22 in the vehicle 12 in the intake device 10.

  The vehicle 12 includes a chassis frame 16 and a cab 18 attached on the chassis frame 16. The chassis frame 16 has a pair of side frames 16a (see FIGS. 1 to 3) extending in the front-rear direction of the vehicle 12, and a plurality of cross members 16b (see FIG. 3) passed between the side frames 16a. The cab 18 is provided so as to be positioned at the foremost side of the vehicle. On the chassis frame 16 behind the cab 18, as shown in FIGS. 1 and 2, a loading platform 24 (which is a mounting member) is attached. That is, in this embodiment, the vehicle 12 is a truck. In addition, instead of the loading platform 24, for example, a mounting member such as a tank, a crane, a pump, and a mixer can be attached to the chassis frame 16. The tire 26 in FIGS. 1 to 3 is a right front wheel (as a steered wheel) suspended from the chassis frame 16 and is located below the cab 18.

  The cab 18 is disposed on the upper side of the engine 14 supported by the chassis frame 16 (via a mounting member (not shown)). The intake device 10 to which the intake structure IS is applied is configured to be connected to the engine 14 and supply purified outside air (air) to the engine 14. The intake device 10 includes an air cleaner 20 for removing foreign matters such as dust and dirt in the outside air, and a duct member 22 connected to the upstream side of the air cleaner 20. The intake device 10 further includes an intake pipe and an intake manifold connected to the downstream side of the air cleaner 20 in order to guide the outside air purified by passing through the air cleaner 20 to the engine 14. .

  The air cleaner 20 is disposed behind the cab 18. Here, the air cleaner 20 is disposed on the right rear side of the cab 18. Although not shown, the air cleaner 20 is fixed to the chassis frame 16 by known mechanical joining means (for example, bolting) (via a bracket or the like not shown). More specifically, the air cleaner 20 is disposed behind the cab 18 and below the loading platform 24. And the duct member 22 connected with the air cleaner 20 is arrange | positioned so that it may have the opening part 22a (it has the opening of the edge part of the upstream of the duct member 22) in the external air introduction part 30. FIG. Therefore, as will be described later, the outside air taken into the outside air introduction part 30 can be taken into the duct member 22 from the outside air introduction part 30 through the opening 22a. The outside air introduction unit 30 constitutes a part of the intake device 10 to which the intake structure IS is applied. The air cleaner 20 is not limited to the drum type, and may have various shapes or sizes. For example, the air cleaner 20 may be a small one provided inside the duct member 22.

  Since the air cleaner 20 is disposed on the right rear side of the cab 18, the outside air introduction unit 30 is provided together with the duct member 22 at a location on the same side (here, the right side) of the cab 18. The outside air introduction portion 30 is defined between the cab 18 and the tire 26, specifically below the cab 18 and above the tire 26. More specifically, the outside air introduction section 30 is defined between a floor member (lower member) 32 that forms the lower side of the cab 18 and a tire 26 that is disposed on the lower side of the cab 18. The floor member 32 is provided with an inner liner 34 as a liner member on the lower side thereof. The inner liner 34 is attached to the floor member 32 by bolting (not shown) as mechanical joining means. Here, although not illustrated, the inner liner 34 is a member having a substantially U-shaped cross-sectional shape (in a virtual cross section orthogonal to the longitudinal direction (extending in the vehicle width direction here)). However, the inner liner 34 may have other shapes. The inner liner 34 may be fixed to the floor member 32 by other joining means, for example, metallurgical joining means such as welding. By attaching the inner liner 34 to the floor member 32, the outside air introduction part 30 is partitioned between them.

  Now, in FIG. 4, the partial schematic sectional drawing in the external air introduction part 30 and its peripheral position is shown. FIG. 4 is a partial schematic cross-sectional view of a virtual plane (along the line IV-IV in FIG. 3) defined to extend in the front-rear direction of the vehicle 12. The outside air introduction part 30 is located on the upstream side 30a (having an opening at its upstream end) and downstream (here, on the vehicle rear side) (having an opening) with respect to the upstream opening 30a. And a downstream opening 30b. In the present embodiment, the upstream opening 30a is provided so as to open to a space (external space) below the cab 18 (above the chassis frame 16) in the vertical direction of the vehicle. That is, the upstream opening 30a functions as an air intake. The upstream opening 30a is positioned at the front side of the tire 26 (the front end thereof) in the vehicle front-rear direction, and thus is separated from the front end of the vehicle (in the vehicle front-rear direction) by a predetermined distance. The downstream opening 30b opens in front of the air cleaner 20 on the air cleaner 20 side. The upstream opening 30a is partitioned and formed in a first bracket portion 36 provided in the floor member 32 and extending in the vertical direction. The downstream opening 30b is partitioned and formed in a second bracket portion 38 provided in the floor member 32 and extending in the vertical direction. The second bracket portion 38 is disposed behind the first bracket portion 36. A mud guard or the like may be attached to the second bracket portion 38. The inner liner 34 is attached and fixed to the floor member 32 so as to fit between the first bracket portion 36 and the second bracket portion 38 in the floor member 32. In the drawing, the inner liner 34 is shown as being integrally fixed to the floor member 32. In addition, although the 1st bracket part 36 and the 2nd bracket part 38 are each provided integrally with the floor member 32, you may be comprised by the floor member 32 so that attachment or detachment is possible respectively.

  As is apparent from FIG. 4, the upstream opening 30a of the outside air introduction section 30 is located below the downstream opening 30b. And the intermediate part 30c (between the upstream opening part 30a and the downstream opening part 30b) where the opening part 22a of the duct member is located in the outside air introduction part 30 is substantially the same height as the downstream opening part 30b. It is positioned. That is, the outside air introduction part 30 is formed so as to gradually increase in height from the upstream opening 30a toward the intermediate part 30c. In this manner, the portion that changes so as to increase in height from the upstream opening 30a toward the intermediate portion 30c is referred to as an inlet inclined portion 30d. And the intermediate part 30c of the external air introduction part 30 is formed so that it may be located in the highest position in the external air introduction part 30, as evident from FIG. As is clear from these descriptions and FIG. 4, the opening 22 a of the duct member 22 is positioned above the upstream opening 30 a of the outside air introduction unit 30. The intermediate portion 30 c in the outside air introduction portion 30 and the opening 22 a of the duct member 22 positioned there are clearly located above the tire 26. As shown in FIG. 4, the outside air introduction part 30 is configured to be slightly lower than the intermediate part 30 c at the rear of the intermediate part 30 c and the upstream side of the downstream opening part 30 b. The location may be configured at substantially the same height as the intermediate portion 30c. As is clear from FIG. 4, in the outside air introduction portion 30, the upstream opening 30 a is positioned on the vehicle front side with respect to the opening 22 a of the duct member 22.

  The duct member 22 is disposed so as to extend in and out of the outside air introduction portion 30 through the downstream opening 30 b of the outside air introduction portion 30. As described above, the upstream opening 22 a of the duct member 22 is positioned at the intermediate portion 30 c of the outside air introduction portion 30, and the downstream end connection portion 22 b (having the opening) is located above the air cleaner 20. Positioned to be located. A connecting pipe portion 20 a of the air cleaner 20 is connected to the end connecting portion 22 b of the duct member 22. However, the connection between the end connection portion 22b of the duct member 22 and the connection pipe portion 20a of the air cleaner 20 is detachable. This is because the cab 18 can take the normal state shown in FIG. 1 and the forward tilt state shown in FIG. For this reason, the connection portion between the end connection portion 22b of the duct member 22 and the connection pipe portion 20a of the air cleaner 20 is preferably provided so as to enable the connection more suitably and further suppress the influence of vibration or the like of the cab 18 or the like. A connection duct 40 is provided. The connection duct 40 is formed in a bellows shape. Here, the connecting duct 40 is fixed to the end connecting portion 22b of the duct member 22 (by a mechanical connecting means (not shown) (for example, a clip band)). When the cab 18 is in the state of FIG. 1 or when the cab 18 moves from the state of FIG. 2 to the state of FIG. 1, the downstream end (or free end) of the connection duct 40 fixed to the duct member 22. When the cab 18 is tilted from the state shown in FIG. 1 to the state shown in FIG. 2, the connection duct 40 is detached from the connection pipe portion 20 a of the air cleaner 20. The connection duct 40 can also be fixed to the connection pipe portion 20a of the air cleaner 20. Further, in order to more suitably fit the connection pipe portion 20a of the air cleaner 20 into the connection duct 40, the shape of the connection duct 40, the shape of the connection pipe portion 20a, and the like may be designed respectively.

  The cross-sectional shape of the duct member 22 thus provided at each position in the longitudinal direction (substantially in the vehicle front-rear direction) is a cross-sectional shape on a virtual plane orthogonal to the position (here, the cross-sectional shape is circular, but is another shape (for example, a substantially rectangular cross-section)) And the cross-sectional area is generally the same in the longitudinal direction. On the other hand, the cross-sectional area at each position in the longitudinal direction (substantially in the vehicle front-rear direction) of the outside air introduction portion 30 is made larger than the corresponding cross-sectional area of the duct member 22. This is to allow the outside air to suitably enter the outside air introduction portion 30 and further flow into the duct member 22.

  Now, in the intake device 10 of the intake structure IS, the outside air is introduced into the outside air introduction portion 30 through the upstream opening 30a. Then, after passing through the inlet inclined portion 30 d, outside air is sucked into the duct member 22 from the opening 22 a of the duct member 22. Thereafter, the outside air that has passed through the duct member 22 is supplied to the engine 14 via the air cleaner 20.

  The effects of the intake device 10 will be described below. First, in the air intake device 10, the outside air introduction portion 30 in which the opening 22a of the duct member 22 is positioned is positioned above the tire 26 (on the vehicle front side of the air cleaner 20) and below the cab 18, from the above description. As can be seen, it has an upstream opening 30a (as an air intake) that opens away from the tip of the cab. Therefore, in the intake device 10 of the present embodiment, the length of the intake passage on the upstream side of the air cleaner 20 can be significantly shortened with respect to the entire length of the cab 18 as compared with the intake device disclosed in Patent Document 1. Therefore, the intake resistance in the intake passage can be reduced accordingly. In addition, since the cross-sectional area of the outside air introduction part 30 is larger than the cross-sectional area of the duct member 22, the introduction of outside air at the opening 22 a of the duct member 22, that is, intake intake, is performed on the outside air introduction part 30. The opening 22a is not hindered by the arrangement.

  Further, the outside air introduction portion 30 is defined between the floor member 32 of the cab 18 and the tire 26 disposed on the lower side of the cab 18, and the upstream opening 30 a thereof is formed in the vehicle front-rear direction. It is positioned immediately in front of the tire 26. Accordingly, the outside air introduction unit 30 can guide outside air that is not (or not at all) affected by heat from the engine 14 to the inside thereof. Therefore, according to the intake device 10 to which the intake structure of the present embodiment is applied, it is possible to inhale outside air having a lower temperature, and thus it is possible to lower the intake air temperature. The upstream opening 30a of the outside air introduction unit 30 is preferably provided at a location where heat from the engine 14 is difficult to receive or low in heat reception possibility so that the intake air temperature can be reduced.

  Furthermore, an inner liner 34 is provided on the lower side of the floor member 32 of the cab so as to partition and form the outside air introduction portion 30 where the opening 22a of the duct member 22 is positioned. Therefore, in the intake device 10, the opening 22 a of the duct member 22 is preferably separated from the tire 26 and its periphery by the inner liner 34 that partially defines and forms the outside air introduction portion 30. Therefore, it is possible to more suitably prevent soil, water, and the like splashed up by the tire 26 and the like during traveling from reaching the opening 22a. Further, the intermediate portion 30 c of the outside air introduction portion 30 and the opening 22 a of the duct member 22 positioned there are clearly above the tire 26, and in this case, substantially above the tire 26. Accordingly, it is possible to more suitably prevent such soil and water from reaching the opening 22a.

  In addition, the opening 22 a of the duct member 22 positioned in the outside air introduction portion 30 is positioned above the upstream opening 30 a of the outside air introduction portion 30, and the upstream opening 30 a of the duct member 22 It is positioned on the vehicle front side with respect to the opening 22a. Therefore, in the intake device 10, the outside air introduced from the upstream opening 30a into the outside air introduction portion 30 has an inlet inclined portion whose height increases toward the intermediate portion 30c (where the opening 22a of the duct member is located). Pass 30d. In this process, water and foreign matter in the outside air can be removed. For example, during rainy weather, raindrops may enter the outside air introduction unit 30 together with outside air. However, the inlet inclined portion 30d is inclined so that its height increases from the upstream opening 30a toward the intermediate portion 30c. In the process, raindrops and the like can be separated from the outside air by its own weight. Therefore, by providing the entrance inclined portion 30d, it is possible to suitably suppress or prevent intrusion of raindrops and the like into the duct member 22. In particular, as described above, since the cross-sectional area of the outside air introduction part 30 is larger than the cross-sectional area of the duct member 22, the outside air outside the duct member 22 at the outside air introduction part 30, that is, the flow rate of intake air is relatively slow, The air-water separation can occur more suitably. In addition, since the inlet inclined portion 30d can function so as to provide the air-water separation action in this way, it may be referred to as an air-water separation portion.

  Further, in the intake device 10 of the intake structure IS, the air cleaner 20 is disposed behind the cab 18 and below the loading platform 24, and the outside air introduction portion 30 is formed by utilizing the space below the cab 18 and above the tire 26. The duct member 22 is open to the outside air introduction portion 30 and is connected to an air cleaner 20 that is generally located behind the duct member 22. Therefore, the intake structure IS does not require a large interval between the cab 18 and the loading platform 24, and allows a space behind the cab, in this case, in particular, a sufficient loading space to be secured. For the same reason, the intake structure IS has an advantage that it does not substantially affect the overall length of the vehicle 14. Therefore, the intake structure IS can flexibly meet the regulations (for example, full length regulations) of each country on the vehicle.

  In addition, this indication is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this indication, it can change suitably and can implement.

  For example, in the above-described embodiment, the opening 22a of the duct member 22 is positioned in the outside air introduction portion 30 that is defined between the floor member 32 of the cab 18 and the tire 26 that is disposed below the cab 18. However, this does not exclude that the position of the outside air introduction portion 30 and the opening 22a of the duct member 22 is in a position that is off from directly above the tire 26 in the vehicle width direction or the left-right direction. Allows such deviations in the left-right direction. Further, in a vehicle in which the air cleaner is disposed on the left side of the vehicle, an outside air introduction portion and a duct member can be provided on the left side of the vehicle. Further, the outside air introduction portion 30 is provided at a member (for example, a position indicated by reference numeral “35” in FIGS. 1 and 2) that forms a step where a driver or the like whose upstream side opening portion 30a gets in and out of the cab 18 takes a step. It may be provided so that it may be located in the member to obtain.

  Further, since the inner liner 34 is provided so as to cover the tire and can function as a mudguard, it may be regarded as a so-called fender. In addition, the outside air introduction portion 30 may be partitioned and formed inside a fender provided below the cab 18 and above the tire 26. In other words, the fender may have a double structure, and a space therebetween may be used as an outside air introduction portion. Alternatively, the cab floor member 32 itself may have a double structure, and the inside of the cab floor member 32 may serve as an outside air introduction section. In this case, the member or portion inside the cab of the floor member can be regarded as the lower member of the cab in the technology of the present disclosure.

  Moreover, in the said embodiment, although the vehicle 12 was a vehicle in which the cab 18 can tilt, the technique of this indication is not limited to this. The technology of the present disclosure can also be applied to a vehicle in which the cab does not tilt, such as a light truck.

IS Intake Structure 10 Intake Device 12 Vehicle 14 Engine 16 Chassis Frame 18 Cab 20 Air Cleaner 22 Duct Member 22a Opening (Opening)
24 Loading platform (body member)
26 tires (wheels)
30 Outside air introduction part 30a Upstream side opening (opening)
32 Floor member (lower member)
34 Inner liner (liner member)
40 Connection duct

Claims (6)

An outside air introduction section that is partitioned between the cab and the tire and has an opening at the upstream end,
An air intake structure comprising: a duct member having an opening at an end for taking in outside air from the outside air introducing portion.   The air intake structure according to claim 1, wherein the opening of the duct member is located above the tire.   The air intake structure according to claim 1 or 2, wherein a liner member is provided on a lower side of the lower side member of the cab so as to define the outside air introduction portion.   The intake structure according to any one of claims 1 to 3, wherein the opening of the outside air introduction portion is positioned on the vehicle front side of the opening of the duct member.   The air intake structure according to any one of claims 1 to 4, wherein the opening of the duct member is positioned above the opening of the outside air introduction portion. The duct member is configured to be connected to an air cleaner;
The air intake structure according to any one of claims 1 to 5, wherein the air cleaner is disposed below a body member disposed behind the cab.

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