JP5858326B2 - Cab front structure - Google Patents

Description

  The present invention relates to a front structure of a cab such as a cab over type truck.

  Japanese Patent Application Laid-Open No. 2007-106300 describes a dash panel insulator that is mounted on a side surface of a dash panel compartment that divides an engine compartment and a compartment. The dash panel insulator includes a sound insulation panel, and a sound absorbing material is integrated on one side of the sound insulation panel. The dash panel insulator is fixed to the dash panel in a state where the sound absorbing material is in close contact with the passenger compartment side of the dash panel.

JP 2007-106300 A

  In general, noise in the cab of a cab-over type vehicle is transmitted to the cab from below through the engine mount and cab mount of the vehicle, and the panels constituting the cab (roof panel, A side panel, a dash panel, a back panel, and a floor panel) are radiated from each panel by vibrating.

  The insulator described in Patent Document 1 is effective for reducing the noise radiated from the dash panel, and even in the cab-over type vehicle, measures are taken to reduce the noise radiated from the dash panel. It is preferable.

  However, when the insulator described in Patent Document 1 is fixed to the dash panel of the cab-over type vehicle, the insulator is caused by the vibration of the dash panel due to the excitation force transmitted to the cab from below and the acoustic radiation resulting from the vibration of the dash panel. There is a possibility that noise may be radiated from the insulator into the vehicle interior due to vibration of itself. Further, when the insulator is increased in weight for vibration suppression, the vehicle is increased in weight.

  Therefore, an object of the present invention is to provide a cab front structure that can reduce the noise in the vehicle interior caused by the vibration of the dash panel while suppressing the weight of the vehicle.

  In order to achieve the above object, the cab front structure of the present invention includes a floor panel, a dash panel, and a heat exchanger case body.

The floor panel extends rearward from the lower front end of the cab and defines the bottom of the passenger compartment. The dash panel stands up along the vehicle width direction from the front end portion of the floor panel, and partitions the front portion of the passenger compartment. The heat exchanger case body is supported at least on the cab side excluding the dash panel behind the dash panel, and has a front surface of the case body that faces the rear surface of the dash panel, and an evaporator and an evaporator for cooling air flowing in from outside or inside the vehicle The heater core which heats the air cooled by is accommodated. In addition, the heat exchanger case body is a frame shape that extends forward from the front surface of the case body to the rear surface of the dash panel and closely contacts the rear surface of the dash panel to form a closed space between the rear surface of the dash panel and the front surface of the case body. A closed space forming portion. The closed space forming unit forms the closed space so that the area of the front surface area defined on the rear surface of the dash panel in the closed space is larger than the area of the rear surface area defined on the front surface of the case body.

  In the above configuration, noise radiated from the rear surface of the dash panel due to vibration of the dash panel is radiated to the closed space between the rear surface of the dash panel formed by the closed space formation body and the front surface of the case body, and is radiated into the vehicle interior. Not. For this reason, the noise in the vehicle interior resulting from the vibration of the dash panel can be reduced.

  In addition, the heat exchanger case body, which is supported at least on the cab side excluding the dash panel behind the dash panel and accommodates heavy evaporators and heat cores, extends forward from the front of the case body and adheres to the rear surface of the dash panel Therefore, the vibration of the closed space forming portion due to the vibration of the dash panel and the acoustic radiation from the rear surface of the dash panel can be reduced. For this reason, generation | occurrence | production of the noise resulting from the vibration of a closed space formation part can be suppressed, and the noise in a vehicle interior can be reduced. Further, since it is not necessary to increase the weight of the closed space forming portion for damping the closed space forming portion, the weight of the vehicle can be suppressed.

  Further, since the closed space forming portion is formed in a frame shape, the weight of the vehicle can be suppressed as compared with a case where a panel-like soundproof member having a surface facing the rear surface of the dash panel, for example, a sound insulation panel is provided. .

  ADVANTAGE OF THE INVENTION According to this invention, the noise in a vehicle interior resulting from a vibration of a dash panel can be reduced, suppressing the weight increase of a vehicle.

It is a principal part perspective view of the vehicle concerning one Embodiment of this invention. It is a principal part perspective view of the cab of the vehicle of FIG. FIG. 3 is a cross-sectional view of the vehicle of FIG. 1 taken along the line III-III. FIG. 4 is a cross-sectional view taken along line IV-IV of the vehicle in FIG. 1. It is a perspective view which shows the outline of the HVAC unit and shroud of the vehicle of FIG. It is a top view which shows the outline of the dash panel, HVAC unit, and shroud of the vehicle of FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawing, the arrow FR indicates the front of the vehicle, the arrow UP indicates the upper side, and the arrow IN indicates the inner side in the vehicle width direction. In the following description, front and rear means front and rear of the vehicle, and left and right mean left and right in a state of facing the front of the vehicle.

  As shown in FIGS. 1 to 4, the front structure 1 of the cab according to this embodiment includes a dash panel 15, a floor panel 13, an installation bar 50, an HVAC (Heating, Ventilating and Air-Conditining) unit 60, and a shroud 80. And the front portion of the cab 3 having the seal portion 90.

  As shown in FIG. 1, the vehicle 2 is a cab-over type truck in which an engine room 9 is located below the cab 3. The cab 3 is supported so as to be able to incline forward by a front cab mount 5 and a rear cab mount (not shown) attached to the front end portion of the vehicle body frame 4.

  The vehicle body frame 4 includes left and right main beams 6 extending in parallel in the front-rear direction, a plurality of cross members 7, a front cab mount 5, and a rear cab mount. The left and right main beams 6 are connected to each other by a plurality of orthogonal cross members 7. A traveling axle (not shown) is provided near the front end and the rear end of the body frame 4. The traveling wheels 8 are rotatably supported at both ends of the traveling axle in the vehicle width direction.

  The cab 3 is a substantially box-shaped body and partitions the passenger compartment 10 inside. The cab 3 includes a roof panel 11, a side panel 12, a front frame portion 16, a dash panel 15, a back panel 14, and a floor panel 13. These panels are made of a high-strength material such as a steel plate, for example, and are formed by press molding. The cab 3 also has an instrument bar 50 (see FIGS. 2 to 4) that supports an instrument panel (not shown) located on the front side of the passenger compartment 10.

  The roof panel 9 defines the upper part of the passenger compartment 10. The side panels 12 are joined to both ends of the roof panel 11 in the vehicle width direction, and define both ends of the vehicle compartment 10 in the vehicle width direction. The front frame portion 16 is joined to the side panel 12 in front of the passenger compartment 10. The dash panel 15 is joined to the front frame portion 16 and the side panel 12 and stands up along the vehicle width direction to partition the front portion of the vehicle compartment 10. The back panel 14 is joined to the roof panel 11 and the side panel 12 and defines a rear portion of the vehicle compartment 10. The floor panel 13 is joined to the side panel 12, the dash panel 15, and the back panel 14, and defines the bottom portion of the passenger compartment 10.

  The roof panel 11 is a substantially rectangular flat plate. Both ends in the vehicle width direction of the roof panel 11 are joined to the upper end of the side panel 12, and the rear end is joined to the upper end of the back panel 14.

  The side panel 12 has a door opening 20 formed in a substantially rectangular shape at the center, and includes a front pillar portion 21, a rocker portion 22, a fender portion 23, a roof side rail portion 24, and a rear pillar portion 25. Have.

  The front pillar portion 21 includes a front pillar inclined portion 21a extending obliquely forward from the upper end and a front pillar vertical portion 21b extending bent substantially vertically downward from the lower end of the front pillar inclined portion 21a. Configure the leading edge. The rocker portion 22 bends and extends backward from the lower end of the front pillar portion 21 (lower end of the front pillar vertical portion 21 b), and constitutes a part of the lower edge of the door opening 20. The fender portion 23 extends in an arch shape from the rear end of the rocker portion 22. The lower end side of the fender portion 23 constitutes a wheel house that covers the front wheels from above. Further, the upper end side of the fender portion 23 constitutes a part of the lower edge of the door opening 20. The roof side rail portion 24 extends from the upper end of the front pillar portion 21 (the upper end of the front pillar inclined portion 21a) so as to bend toward the rear of the vehicle, and defines the upper edge of the door opening 20. The rear pillar portion 25 connects the rear end of the fender portion 23 and the rear end of the roof side rail portion 24 to partition the rear edge of the door opening 20.

  The floor panel 13 is a substantially rectangular plate. The floor panel 13 includes a floor panel front portion 30 extending rearward from the front end of the cab, a floor panel inclined portion 31 extending inclined rearwardly from the rear end of the floor panel front portion 30, and a rear end of the floor panel inclined portion 31. And a floor panel rear part 32 extending substantially parallel to the floor panel front part 30 and extending to the rear end of the cab. An engine room 9 that houses an engine (not shown) is formed below the floor panel 13 of the vehicle 2.

  As shown in FIGS. 2 to 4, the floor panel front portion 30 includes a front end portion 33 that extends substantially horizontally from the front end to the rear, a slope portion 34 that slopes downward and rearward from the rear end of the front end portion 33, and a slope. A rear end portion 35 that bends substantially parallel to the front end portion 33 from the rear end of the portion 34 and extends to the front end of the floor panel inclined portion 31.

  A floor panel joint portion 36 extending substantially vertically downward is formed at the front end of the front end portion 33 of the floor front portion 30.

  As shown in FIG. 1, the dash panel 15 is a substantially rectangular plate-like body, the rear surface upper portion of the dash panel 15 is joined to the front frame portion 16, and both ends in the vehicle width direction of the dash panel 15 are joined to the side panel 12. To do. Further, the lower portion of the dash panel 15 is joined to the floor panel joint portion 36 of the floor panel 13 as described later (see FIGS. 3 and 4). That is, the dash panel 15 stands up along the vehicle width direction from the front end portion of the floor panel 13 and partitions the front portion of the passenger compartment 10.

  The back panel 14 is a substantially rectangular plate-like body. The back panel 14 has a back panel opening 40 into which a rear window glass is fitted at a substantially central portion.

  The instrument bar 50 is disposed inside the instrument panel and, as shown in FIGS. 2 and 3, is a substantially cylindrical shape made of metal that extends along the vehicle width direction substantially parallel to the dash panel 15 above the floor panel 13. The instrument bar main body 51 and the floor panel 13 are connected to the instrument bar main body 51 and the rear panel of the dash panel 15 and slightly to the left of the center in the vehicle width direction (passenger seat side). And a column 52 which is a substantially cylindrical member made of metal that supports 51 from below.

  The instrument bar main body 51 is formed in a substantially U shape as viewed from above, with its central portion bent rearward. In addition, bracket portions 56 extending in the vertical direction are formed at both ends of the instrument bar main body 51 in the vehicle width direction. The bracket portion 56 is configured such that a bolt (not shown) that passes through a bolt hole provided in the bracket portion 56 is screwed with a bolt hole (not shown) provided in the front pillar vertical portion 21b of the side panel 12. It is fixed to the upper part inside the front pillar vertical part 21b. A steering support bracket 105 that supports the steering column 104 of the steering 103 is fixed to the right side (driver's seat side) of the instrument bar main body 51 in the vehicle width direction. The instrument bar main body 51 is supported on the upper rear surface of the dash panel 15 by a plurality of brackets.

  The column 52 includes a column body 53, an upper bracket portion 54 that extends from the upper end of the column body 53, and a lower bracket portion 55 that extends from the lower end of the column body 53.

  The lower bracket portion 55 is a substantially flat body and is formed integrally with the lower end portion of the column main body 53. The lower bracket portion 55 extends obliquely downward and rearward from the lower end portion of the column main body 53. A bolt inserted into a bolt hole (not shown) provided in the approximate center of the lower bracket portion 55 is screwed into a bolt hole (not shown) provided in the inclined portion 34 of the floor panel front portion 30 of the floor panel 13. As a result, the lower bracket portion 55 is fixed to the inclined portion 34. Note that the lower surface of the lower bracket portion 55 may be welded to the upper surface of the inclined portion 34 by spot welding or the like.

  The column main body 53 has a cylindrical shape and extends from the upper end of the lower bracket so as to be inclined rearward and upward.

  The upper bracket portion 54 is a substantially flat body and is formed integrally with the upper end of the column main body 53. The upper bracket portion 54 extends substantially vertically upward from the upper end of the column main body 53. On the upper end surface of the upper bracket portion 54, a joining surface 54a having a cross section in the front-rear direction recessed in an arc shape is formed. The support 52 supports the instrument bar body 51 from below by fixing (welding) the joint surface 54a and the lower part of the side surface of the instrument bar body 51 by spot welding or the like. A bolt hole is formed in the joint surface 54a, and a bolt inserted through the bolt hole is screwed into a bolt hole formed in the side surface of the instrument bar main body 51, thereby fixing the joint surface 54a and the instrument bar main body 51. May be.

  The HVAC unit 60 is disposed inside the instrument panel and includes a heat exchanger unit 61 and a blower unit 62 as shown in FIGS. 2, 5, and 6. The heat exchanger unit 61 is disposed substantially at the center in the vehicle width direction, and the blower unit 62 is arranged in parallel on the left side (passenger seat side) of the heat exchanger unit 61 in the vehicle width direction.

  The blower unit 62 includes an inside / outside air switching box 63 that switches and introduces air flowing from outside or inside the vehicle, and a centrifugal blower 64 that flows air introduced from the inside / outside air switching box 63 into the heat exchanger unit 61. have. The inside / outside air switching box 63 is provided with an inside air introduction port, an outside air introduction port, and an inside / outside air switching damper (not shown). The inside air inlet is an opening through which the air in the passenger compartment flows. The outside air inlet is an opening for introducing air outside the vehicle. The inside / outside air switching damper is a damper for closing either one of the inside air introduction port and the outside air introduction port, and switches the air flowing in by the operation to the air outside the vehicle or the air inside the vehicle. The blower 64 includes a blower case 65, a blower fan (not shown), a blower motor, and the like housed in the blower case 65, and the blower fan is driven by a blower motor supplied with electric power from a vehicle power source. The right side of the blower case 65 communicates with an inflow port of a heat exchanger case body 69 (described later), and an air passage 66 (see FIGS. 2 and 6) through which air blown by the blower 64 flows into the heat exchanger case body 69. Reference) is provided. Two upper blower bracket joints 67 extending upward are formed at an upper portion of the blower case 65 at a predetermined interval in the vehicle width direction. A lower blower bracket joint 68 extending downward is formed at the lower left portion of the blower case 65. Each bracket joining portion 67, 68 is substantially flat and has a bolt hole formed in the center.

  The heat exchanger unit 61 includes a heat exchanger case body 69 and an evaporator and a heater core (not shown) housed in the heat exchanger case body 69.

  The heat exchanger case body 69 is formed in a substantially rectangular parallelepiped shape from a resin material having a predetermined mechanical strength, for example, polypropylene. The heat exchanger case body 69 has a planar case body front surface 70 facing the substantially central portion of the rear surface of the dash panel 15 at the front. Two upper heat exchanger bracket joints 71 (see FIGS. 3 and 4) that extend rearward at a predetermined interval in the vehicle width direction are formed in the upper portion of the heat exchanger case body 69. In addition, two lower heat exchanger bracket joints 72 that extend downward at a predetermined interval in the vehicle width direction are formed in the lower portion of the heat exchanger case body 69. Each bracket joint portion 71, 72 is substantially flat and has a bolt hole formed in a substantially central portion. The heat exchanger case body 69 has an air passage (not shown) through which air in the case flows. The rear left side portion of the heat exchanger case body 69 is provided with an inlet (not shown) that is connected to one end of the air passage and communicates with the air passage 66 of the blower unit. The heat exchanger case body 69 is provided with a defroster opening 73, a face opening 74, and a foot opening (not shown) connected to the other end of the air passage. The defroster opening 73 is connected via a defroster duct (not shown) to a defroster outlet (not shown) that sets the air blowing direction toward the windshield of the vehicle. The face opening 74 is disposed at a substantially central portion of the instrument panel via a face duct (not shown), and sets the air blowing direction toward the head and upper body of the front seat occupant (not shown). ). The foot opening is connected via a foot duct (not shown) to a foot outlet (not shown) that sets the air blowing direction toward the feet of the front seat occupant. The air flowing in from the inflow port flows into one end of the air passage and flows in the air passage, and from the defroster opening 73, the face opening 74 and the foot opening, through the defroster outlet, the face outlet and the foot outlet. It flows out into the passenger compartment 10.

  The evaporator is disposed in the vicinity of the upstream side of the air passage in the heat exchanger case body 69. As is well known, an evaporator is supplied with low-pressure refrigerant that has been decompressed by a decompression device such as an expansion valve of a refrigeration cycle for vehicle air conditioning, and the low-pressure refrigerant absorbs heat from the air flowing through the air passage and evaporates. Cool the air flowing through. The heater core is disposed in the vicinity of the downstream side of the air passage in the heat exchanger case body 69. The heater core heats the air flowing through the air passage using the cooling water of the vehicle engine as a heat source. An air mix damper (not shown) is provided between the position in the air passage where the evaporator is close and the position where the heater core is close. By controlling the opening degree of the air mix damper, the amount of air passing through the vicinity of the heater core is adjusted, and the temperature of the air flowing into the passenger compartment 10 from each of the air outlets is adjusted.

  In this HVAC unit 60, when the blower fan of the blower unit 62 rotates, air flows from the inside air introduction port or the outside air introduction port, and the air that flows through the air passage 66 passes through the air passage of the heat exchanger unit 61. Flowing. During cooling operation, the air in the air passage is heat-exchanged by the evaporator and cooled, and the amount of cooled air passing near the heat core is limited by the control of the air mix damper. It flows out into the passenger compartment 10 from the air outlet. Also, during the heating operation, the amount of the cooled air passing through the vicinity of the heater core is increased by the control of the air mix damper, and the air is heated, so that high-temperature air is blown each time compared with the cooling operation. It flows out into the passenger compartment 10 from the exit.

  The shroud 80 is formed in a rectangular frame shape from a resin material having a predetermined mechanical strength, for example, polypropylene. The shroud 80 includes a flat plate-like upper plate portion 81 and a lower plate portion 82 that extend in the vehicle width direction substantially parallel to each other at a predetermined interval in the vertical direction. The shroud 80 includes a flat plate-like left plate portion 83 and a right plate portion 84 that extend in the vertical direction substantially parallel to each other at a predetermined interval in the vehicle width direction. The upper end portion of the left plate portion 83 is connected to the left end portion of the upper plate portion 81, and the lower end portion of the left plate portion 83 is connected to the left end portion of the lower plate portion 82. The upper end portion of the right plate portion 84 is connected to the right end portion of the upper plate portion 81, and the lower end portion of the right plate portion 84 is connected to the right end portion of the lower plate portion 82. Each plate part 81-84 is extended so that it may incline outside toward the front from the rear end of the front-back direction.

  The seal portion 90 is made of an elastic material, for example, polyurethane or rubber, and is formed in a rectangular frame shape having the same size as the front edge of the shroud 80. The seal portion 90 has a close contact portion 91 at the front end and a fixing portion 92 at the rear end.

  Next, the connection aspect of the floor panel 13, the dash panel 15, the instrument bar 50, the HVAC unit 60, the shroud 80, and the seal part 90 will be described.

  As shown in FIGS. 3 and 4, the floor panel joint portion 36 of the floor front portion 30 and the lower portion of the dash panel 15 are welded by spot welding or the like.

  As shown in FIG. 2, the heat exchanger case body 69 of the HVAC unit 60 is disposed in front of the U-shaped hollow portion of the instrument bar main body 51. 2 to 4, the upper blower bracket joint portion 67 of the blower case 65 of the HVAC unit 60 and the upper heat exchanger bracket joint portion 71 of the heat exchanger case body 69 are fixed to the instrument bar main body 51. The HVAC unit 60 is joined with a nut (not shown) that is joined to the upper bracket 100 and a bolt (not shown) inserted into a bolt hole formed in each joint 67, 71 and the upper bracket 100. It is connected to the instrument bar 50 and supported by the instrument bar 50. Further, the lower blower bracket joint portion 68 of the blower case 65 and the lower heat exchanger bracket joint portion 72 of the heat exchanger case body 69 are joined to the lower bracket 101 fixed to the inclined portion 34 of the floor panel 13. The bolts (not shown) inserted through the bolt holes formed in the joint portions 68 and 72 and the lower bracket 101 are screwed with nuts (not shown), so that the HVAC unit 60 is connected to the floor panel 13, and the floor panel 13 is supported.

  As shown in FIGS. 4 to 6, the outer edge of the case body front surface 70 of the heat exchanger case body 69 and the inner side of the rear end portion (rear end portion of each plate portion 81 to 84) of the shroud 80 are adhesives, For example, it is fixed by a polyurethane adhesive or an epoxy resin adhesive. A seal portion 90 is disposed between the front edge of the shroud 80 (the front end portion of each plate portion 81 to 84) and the substantially central portion of the rear surface of the dash panel 15. The fixing portion 92 at the rear end of the seal portion 90 is fixed to the front edge of the shroud 80 with an adhesive or the like. The close contact portion 91 at the front end of the seal portion 90 is in close contact with the substantially central portion of the rear surface of the dash panel 15. As a result, a closed space 85 (see FIG. 4) is formed between the substantially central portion of the rear surface of the dash panel 15 and the case body front surface 70. That is, the closed space 85 is defined by the substantially central portion of the rear surface of the dash panel 15, the shroud 80, and the case body front surface 70.

  In the present embodiment, in the dash panel 15, a substantially central portion of the dash panel 15 that radiates a large amount of noise into the passenger compartment 10 due to a relatively large vibration caused by an excitation force generated mainly by the engine transmitted from below. A closed space 85 is formed between the rear surface and the case body front surface 70 of the heat exchanger case body 69. For this reason, noise radiated from the substantially central portion of the rear surface of the dash panel 15 that defines the closed space 85 is radiated only to the closed space 85 and not radiated into the vehicle interior 10. Can be reduced.

  Further, the case body front surface 70 and the shroud 80 of the heat exchanger case body 69 that is supported by the instrument bar 50 and the floor panel 13 at the rear of the dash panel 15 and accommodates the evaporator and the heat core, which are heavy objects, are fixed. The vibration of the shroud 80 due to the vibration of the dash panel 15 and the acoustic radiation from the central portion of the rear surface of the dash panel 15 can be reduced. For this reason, since generation | occurrence | production of the noise resulting from the vibration of the shroud 80 can be prevented, the noise in the compartment 10 can be reduced. Further, since it is not necessary to increase the weight of the shroud 80 for vibration suppression, it is possible to suppress the weight of the vehicle 2.

  Further, the closed space 85 can be formed by providing a rectangular frame-shaped shroud 80 and a seal portion 90 instead of a panel-like soundproof member having a surface facing the rear surface of the dash panel 15, for example, a sound insulation panel. In addition, it is possible to reduce noise in the passenger compartment 10 due to vibration of the dash panel 15 while suppressing the weight of the vehicle 2.

  In addition, in order to control the vibration of the dash panel 15, there is no need to attach an asphalt sheet or the like to the dash panel 15 to increase the weight. Can be reduced.

  Further, in order to reduce noise, a bead is provided on the dash panel 15 or the dash panel 15 is curved to increase the bending rigidity of the dash panel 15 itself, and the resonance frequency of the dash panel 15 is increased by the engine. It is not necessary to set a value higher than the vibration frequency (23 Hz to 107 Hz when the engine speed is 700 rpm to 3200 rpm). For this reason, since it is not necessary to change the shape of the dash panel 15, a front panel (not shown) disposed on the front outer side (front surface of the cab) of the dash panel 15 or an HVAC unit disposed on the rear inner side of the dash panel 15. Noise can be reduced without changing the layout of the in-vehicle unit such as 60.

  As mentioned above, although embodiment which applied the invention made | formed by this inventor was described, this invention is not limited with the description and drawing which make a part of indication of invention by this embodiment.

  For example, in the present embodiment, the seal portion 90 is disposed between the front edge of the shroud 80 and the rear surface of the dash panel 15, but the seal portion 90 may be omitted. In this case, the front end of the shroud 80 is fixed to the substantially central portion of the rear surface 15 of the dash panel with an adhesive, for example, a polyurethane adhesive or an epoxy resin adhesive.

  In the present embodiment, the heat exchanger case body 69 is supported by the instrument bar 50 and the floor panel 13, but the heat exchanger case 69 may be supported by either the instrument bar 50 or the floor panel 13. Good.

  In the present embodiment, the outer edge of the case body front surface 70 of the heat exchanger case body 69 and the inner side of the rear end of the shroud 80 are fixed by an adhesive, but instead, the heat exchanger case body 69 and The shroud 80 may be integrally formed.

  Further, in this embodiment, the close contact portion 91 at the front end of the seal portion 90 is brought into close contact with the substantially central portion of the rear surface of the dash panel 15, but the close contact portion 91 at the front end of the seal portion 90 is used with an adhesive or the like. The substantially central portion of the rear surface of the dash panel 15 may be fixed.

  That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  The present invention is widely applicable to a cab front structure of a cab over type vehicle.

1: Front structure 2: Vehicle 3: Cab 10: Cab 13: Floor panel 15: Dash panel 30: Floor panel front part 33: Front end part 34: Inclined part 36: Floor panel joint part 50: Instrument bar 51: Instrument Bar body 52: support 60: HVAC unit 61: heat exchanger unit 62: blower unit 69: heat exchanger case body 73: case body front surface 80: shroud (closed space forming body)
85: Closed space 90: Seal part

Claims (1)

A floor panel that extends rearward from the lower front end of the cab and defines the bottom of the passenger compartment;
A dash panel that stands up along the vehicle width direction from the front end of the floor panel and divides the front of the vehicle compartment;
An evaporator that is supported at least on the cab side excluding the dash panel behind the dash panel, has a front surface of the case body that faces the rear surface of the dash panel, and cools air flowing from outside or inside the vehicle, and flows from the evaporator A heat exchanger case body that houses a heater core that heats air, and
The heat exchanger case body extends forward from the front surface of the case body to the rear surface of the dash panel and is in close contact with the rear surface of the dash panel to form a closed space between the rear surface of the dash panel and the front surface of the case body. have a frame-like closed space forming unit for,
The closed space forming unit includes the closed space such that an area of a front surface region defined on the rear surface of the dash panel is larger than an area of a rear surface region defined on the front surface of the case body. A cab front structure characterized by forming a cab.

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