JP2011121452A - Body rear structure for rear engine bus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep the strength of an outrigger intact and keep an exhaust pipe fixing means simple even when an exhaust pipe with an exhaust gas treatment device is arranged through an engine room front panel. <P>SOLUTION: The outrigger 10 partitioning off an engine room in the rear of a rear engine bus is so constructed that horizontal frames 12 and 14 positioned widthwise, vertical frames 16 and 18 positioned vertically and mounted with the horizontal frames, and brace frames 22 and 24 installed diagonally from a center portion of the horizontal frames to the vertical frames on both sides are secured together and that a reinforcing gusset plate 26 is secured to the connections of the horizontal and brace frames. The exhaust pipe 30 with an exhaust gas treatment device for emitting engine exhaust gas is arranged through a frameless open space s formed under the brace frames 22 and 24. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rear body structure of a rear engine bus in which an engine is disposed under the floor of a rear portion of the vehicle body. More specifically, an open space for allowing an exhaust pipe with a muffler to pass through an outrigger that partitions an engine room is provided.

In large vehicles such as buses equipped with diesel engines, exhaust gas standards have become strict in recent years, and it is necessary to improve exhaust gas purification performance. Therefore, an exhaust gas treatment device such as a DPF device or an SCR catalytic converter is attached to the exhaust pipe.
As an exhaust gas treatment device for improving the exhaust gas purification performance, a two-stage exhaust gas treatment in which a liquid reducing agent such as urea water is injected on the upstream side of the reduction catalyst of the exhaust gas purification converter to promote the reduction reaction by the reduction catalyst. An apparatus is preferred.

This two-stage exhaust gas treatment device reduces the NO, HC, CO, etc. in the exhaust gas by oxidation reaction, and a catalytic converter with a built-in reduction catalyst that removes NO _X in the exhaust gas after jetting a liquid reducing agent into the exhaust gas. Since the oxidation catalyst is arranged in series with the exhaust gas flow, the entire length of the exhaust pipe becomes long and a large space is required in the longitudinal direction of the vehicle body.

  In a rear engine bus in which an engine is mounted on the rear part of a vehicle body, an original in-vehicle incidental facility and an incidental facility for exhaust gas purification catalyst are disposed in a rear wheel rear space. Therefore, when an exhaust pipe with a two-stage exhaust gas treatment device for a rear engine bus is equipped, it is necessary to devise the arrangement so as not to take up a large space in the longitudinal direction of the vehicle body.

Patent Document 1 discloses a rear engine body structure of a rear engine bus equipped with an exhaust pipe with a two-stage exhaust gas treatment device. Hereinafter, the rear structure of the vehicle body will be described with reference to FIG.
In the vehicle body rear structure 100 shown in FIG. 3, an engine room 108 is provided behind the rear wheel 106 provided on the vehicle body 102 and below the passenger compartment floor 104. The engine main body 110 is disposed in the engine room 108, and a crankshaft 112 thereof extends in the longitudinal direction of the vehicle body along the engine center line 102a. In the figure, 106 a is the center of rotation of the rear wheel 106.

  A transmission 114 connected to the crankshaft 112 is provided on the front side of the engine body 110. An engine room front panel 116 is provided in the vehicle width direction near the boundary between the engine body 110 and the transmission 114, and heat dissipated from the engine body 110 by the engine room front panel 116 is forward of the engine room front panel 116. To prevent it from spreading.

The engine body 110 is connected to an exhaust pipe 120 with an exhaust gas treatment device through which exhaust gas is exhausted. The exhaust gas is exhausted from an exhaust port 124a provided at the rear end of the vehicle body. The exhaust pipe 120 includes an exhaust path including a first exhaust pipe 122 and a second exhaust pipe 124, a first muffler 126 provided in the first exhaust pipe 122, and a second exhaust pipe provided in the second exhaust pipe 124. It consists of a muffler 128. The first muffler 126 is equipped with an oxidation catalyst that reduces NO, HC, CO, etc. in the exhaust gas by an oxidation reaction. The second muffler 128, the reducing catalytic converter is provided with a reducing catalyst for NO _X removal is filled. Urea water into the exhaust pipe upstream of the second muffler 128 is sprayed to remove the NO _X to promote reduction reaction at the second muffler 128.

  As described above, the first exhaust pipe 122, the first muffler 126, and the second muffler 128 are arranged on the left side of the engine body 110, and the second exhaust pipe 124 is arranged in the vehicle width direction through the lower side of the engine body 110. The exhaust pipe 120 having a long overall length is well accommodated in the engine room 108. In the rear wheel rear space 130 where the exhaust pipe 120 is not disposed, an in-vehicle waste storage tank for storing sewage discharged in the vehicle, an original in-vehicle incidental facility 132 such as a trunk room, a wheelchair lift, a urea water tank 134, etc. Ancillary equipment for purifying exhaust gas is provided.

  The structure of the engine room front panel 116 disposed in the rear structure of the bus body shown in FIGS. 3 and 4 will be described with reference to FIG. FIG. 5 shows only the right side portion of the engine room front panel 116 in the vehicle width direction. In FIG. 5, the engine room front panel 116 includes an outrigger 140 that is an assembly of each frame, and a heat insulating panel 142 that is stretched around the outrigger 140.

  The outrigger 140 includes horizontal frames 144 to 150 arranged in the horizontal direction, vertical frames 152 and 154 arranged in the vertical direction, and bracing frames 156 and 158 arranged in the diagonal direction, and these frames are fixed to each other. Has been configured. An engine support 162 is fixed to the upper surface of the lower frame 160 arranged in the lateral direction, and the engine body 110 is fixed to the engine support 162 via an engine mount 164.

The left outrigger (not shown) is similarly configured, and the left outrigger is also provided with an engine support, and the engine main body 110 is supported by a pair of left and right engine supports. Further, another pair of engine supports is provided at the rear of the vehicle body, and the engine body 110 is supported by a total of four engine supports.
By partitioning the engine room 108 with the engine room front panel 116 on which the heat-insulating panel 142 is stretched, the heat dissipated from the engine body 110 is prevented from being dissipated to the front space.

  Further, the vertical frame 152 has an upper portion inclined by a minute angle toward the inside of the vehicle body, and the vehicle body is assembled to the chassis frame by coupling the vehicle body to the outer surface of the vertical frame 152. Further, the support strength of the vehicle body is increased by coupling the vehicle body to the outrigger.

JP 2006-341819 A

At present, there is a tendency for ancillary equipment mounted on the bus to increase, and therefore, the weight of the bus body tends to increase. Along with this, the engine horsepower tends to increase, and the engine body is becoming larger. For this reason, in the rear engine bus, the engine body and the incidental equipment of the engine cannot be accommodated in the engine room at the rear of the vehicle body in some cases.
Therefore, the exhaust pipe with the exhaust gas treatment device cannot be accommodated in the engine room, and a part of the exhaust pipe has to be protruded to the front region of the outrigger.

  However, when the exhaust pipe is arranged through the engine room front panel, the strength of the outrigger is reduced, and it is necessary to add a fixing means for fixing the long exhaust pipe outside the engine room. There is a problem that the vehicle body structure becomes complicated.

  In view of the problems of the prior art, the present invention does not reduce the strength of the outrigger even when the exhaust pipe with the exhaust gas treatment device is disposed through the engine room front panel in the rear engine bus. The purpose is to simplify the fixing means.

In order to achieve such an object, the rear body structure of the rear engine bus of the present invention is:
In the rear engine bus body rear structure, in which the engine is disposed under the floor at the rear of the vehicle body, and the engine placement region and the front region thereof are partitioned by an outrigger to form an engine room.
The outrigger is installed in a horizontal frame arranged in the vehicle width direction, a vertical frame arranged in the vertical direction and provided with the horizontal frame, and obliquely installed from the central portion of the horizontal frame toward the vertical frames on both sides. The brace frame is fixed to each other, and a reinforcing gusset plate is fixed to the connecting portion between the lateral frame and the brace frame,
An exhaust pipe with a muffler for exhausting exhaust gas of the engine is disposed through an open space formed below the bracing frame.

In the rear structure of the vehicle body of the present invention, an open space for passing an exhaust pipe with an exhaust gas treatment device is formed below the bracing frame, and the exhaust pipe is disposed through the open space.
In the present invention, the bracing frame is provided on the outrigger, and the reinforcing gusset plate is fixed to the connecting portion between the lateral frame and the bracing frame, so that an open space for passing the exhaust pipe is formed below the bracing frame. However, the strength of the outrigger can be maintained high. In addition, the configuration of the outrigger can be simplified.

  In the device of the present invention, the exhaust pipe with a muffler may be suspended from the reinforcing gusset plate via a mounting bracket. In this way, if the exhaust pipe with the exhaust gas treatment device is attached to the reinforcing gusset plate fixed to the connecting portion between the horizontal frame and the brace frame, the support strength of the exhaust pipe can be increased and the reinforcement Since the gusset plate can be used as the exhaust pipe fixing means, the exhaust pipe fixing means can be simplified.

  In the vehicle body rear portion structure of the present invention, an exhaust pipe with a muffler may be attached to the mounting bracket via a vibration-proof rubber. The exhaust pipe easily vibrates when the exhaust gas flows, but the vibration of the exhaust pipe can be suppressed by suspending the exhaust pipe through the vibration-proof rubber on the mounting bracket.

  According to the present invention, in the rear engine bus rear body structure in which the engine is disposed under the floor of the rear portion of the vehicle body, and the engine placement region and the front region thereof are partitioned by the outrigger to form an engine room, the outrigger has a vehicle width. The horizontal frame arranged in the direction, the vertical frame arranged in the vertical direction and on which the horizontal frame is installed, and the brace frame installed obliquely from the central part of the horizontal frame toward the vertical frames on both sides are fixed to each other In addition, an exhaust pipe with an exhaust gas treatment device that exhausts engine exhaust gas into an open space formed below the bracing frame is formed by fixing a reinforcing gusset plate to a connection portion between the lateral frame and the bracing frame. By arranging it through, it is possible to form an open space for passing an exhaust pipe with a muffler below the bracing frame and outriggers. Strength can be maintained high. In addition, the configuration of the outrigger can be simplified.

It is a front view of the engine room front panel which shows one Embodiment of the bus body rear part structure of this invention. It is the perspective view which expanded a part of the said embodiment. It is a schematic side view of the conventional bus body rear part structure. FIG. 4 is a schematic plan view of the bus vehicle body rear structure shown in FIG. 3. It is a front view of the engine room front panel of the conventional bus vehicle body rear part structure.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

(Embodiment)
An embodiment of the rear structure of the bus body of the present invention will be described with reference to FIGS. FIG. 1 shows an outrigger 10 that constitutes a part of the rear structure of the bus body of the present embodiment and an exhaust pipe 30 with an exhaust gas treatment device that is disposed through the lower portion of the outrigger 10. The exhaust pipe 30 with the exhaust gas treatment device of the present embodiment is a case where the engine room front panel 116 is disposed on the right side of the engine main body 110 in the longitudinal direction of the vehicle body as shown by a two-dot chain line in FIG. It is an example.

  FIG. 1 shows only the right side portion of the outrigger 10. In addition, the left side part not shown also has the same structure. The outrigger 10 is composed of horizontal frames 12 and 14 arranged in a horizontal direction, vertical frames 16 and 18 arranged in an up-and-down direction, and bracing frames 20, 22 and 24 arranged in an oblique direction. Has been. A heat insulation panel 25 is stretched on the outrigger 10 to constitute an engine room front panel. The engine room front panel suppresses the heat dissipated from the engine body (not shown) from being transmitted to the front region of the chassis frame.

  All the frames constituting the outrigger 10 are made of a material having a hollow square closed cross section. Butt portions of the horizontal frame 14 and the bracing frames 22 and 24 are butt welded. In addition, a reinforcing gusset plate 26 is welded to the joint between the horizontal frame 14 and the bracing frames 22 and 24 to reinforce the strength of the joint. A plurality of welding holes 28 are formed in the reinforcing gusset plate 26, and the reinforcing gusset plate 26 is line welded to the lateral frame 14 and the bracing frames 22, 24 along the outline of the welding hole 28.

The vertical frame 16 is welded to the web 32 of the side member 30 having a U-shaped cross section. As a result, the outrigger 10 is supported by the side member 30.
Thus, an open space s without a frame is formed below the reinforcing gusset plate 26, and the exhaust muffler 30 can be disposed through the open space s.

  In FIG. 2, a mounting bracket 32 is attached to the reinforcing gusset plate 26 with bolts 34. A fixing plate 38 is coupled to the lower flange 32 a of the mounting bracket 32 by means of bolts 39 via cylindrical anti-vibration rubbers 34 and 36. A hat-shaped adapter 40 is coupled to the fixing plate 38 by a bolt 41. The flanges 40 a formed at both ends of the adapter 40 have an arc shape with the same curvature as the outer peripheral surface of the exhaust pipe 30.

A welding hole 42 is formed in the flange 40 a, and the adapter 40 is line-welded to the outer peripheral surface of the exhaust muffler 30 along the outline of the welding hole 42. In this manner, the exhaust pipe 30 can be disposed through the open space s in a direction perpendicular to the outrigger 10.
As shown in FIG. 1, an L-shaped steel plate 44 is fixed to the bracing frame 22, and a steel plate 46 is fixed to the vertical frame 16 in the horizontal direction. A heat insulating panel 48 is attached to the steel plates 44 and 46 along the arrangement direction of the exhaust pipe 30. Thus, by covering the exhaust pipe 30 with the heat insulating panel 48, it is possible to suppress the retained heat of the exhaust gas from being diffused from the exhaust pipe 30.

  In such a configuration, according to the present embodiment, the bracing frames 22 and 24 are provided on the outrigger 10, and the reinforcing gusset plate 26 is fixed to the connecting portion between the lateral frame 14 and the bracing frames 22 and 24. Even if the open space s for passing the exhaust pipe 30 with the muffler is formed below the 22, 24, the strength of the outrigger 10 can be maintained high as in the conventional case.

  Further, since the exhaust pipe 30 is suspended from the reinforcing gusset plate 26 via the mounting bracket 32, the support strength of the exhaust pipe 30 can be increased, and another fixing means can be used as a fixing means for the exhaust pipe 30. There is no need to provide means. Thereby, the fixing means of the exhaust pipe 30 can be simplified.

  Further, the exhaust pipe 30 with a muffler is likely to vibrate due to the flow of exhaust gas. However, since the exhaust pipe 30 is suspended from the mounting bracket 32 via vibration isolating rubbers 34 and 36, the vibration of the exhaust pipe 30 with a muffler is outriggered. 10 can be effectively suppressed.

  According to the present invention, in the rear engine bus, even when the exhaust pipe with the exhaust gas treatment device is disposed through the engine room front panel constituted by the outrigger, the strength of the outrigger is not lowered and the fixing means for the exhaust pipe is provided. Can be simplified.

DESCRIPTION OF SYMBOLS 10 Outrigger 12,14 Horizontal frame 16,18 Vertical frame 20,22,24 Bracing frame 25,48 Thermal insulation panel 26 Reinforcement gusset plate 28,42 Weld hole 30 Exhaust pipe with exhaust gas treatment device 32 Mounting bracket 32a, 40a Flange 34, 36 Anti-vibration rubber 38 Fixed plate 40 Adapter 44, 46 Type steel s Open space

Claims (3)

In the rear engine bus body rear structure, in which the engine is disposed under the floor at the rear of the vehicle body, and the engine placement region and the front region thereof are partitioned by an outrigger to form an engine room.
The outrigger is installed in a horizontal frame arranged in the vehicle width direction, a vertical frame arranged in the vertical direction and provided with the horizontal frame, and obliquely installed from the central portion of the horizontal frame toward the vertical frames on both sides. The brace frame is fixed to each other, and a reinforcing gusset plate is fixed to the connecting portion between the lateral frame and the brace frame,
A vehicle rear structure for a rear engine bus, wherein an exhaust pipe with an exhaust gas treatment device for exhausting exhaust gas of an engine is disposed through an open space formed below the bracing frame.   2. The rear engine bus rear body structure according to claim 1, wherein the exhaust pipe with the exhaust gas treatment device is suspended from the reinforcing gusset plate via a mounting bracket.   The rear engine bus rear body structure according to claim 2, wherein the exhaust pipe with the exhaust gas treatment device is attached to the mounting bracket via an anti-vibration rubber.

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