JP5989377B2 - Exhaust purification device - Google Patents

Description

  The present invention relates to an exhaust emission control device.

  2. Description of the Related Art In recent years, a selective reduction type that includes a particulate filter that collects particulates in exhaust gas in the middle of an exhaust pipe of a vehicle, and that can selectively react NOx with ammonia even in the presence of oxygen on the downstream side of the particulate filter. It is considered that a catalyst is provided and urea water is added as a reducing agent between the selective reduction catalyst and the particulate filter to simultaneously reduce particulates and NOx.

  In that case, each of the particulate filter and the selective catalytic reduction catalyst must be held in the casing and mounted in the vehicle, but these occupy a relatively large arrangement space, and the arrangement space is used for the vehicle. In the case of a vehicle type that is difficult to secure inside the frame, a particulate filter and a selective reduction catalyst casing must be provided outside the frame.

  However, since various equipment such as a fuel tank and a urea water tank must be arranged outside the frame, the particulate filter 1 and the selective catalytic reduction catalyst 2 are held as shown in FIG. The axial centers 3x and 4x of the casings 3 and 4 held are arranged in parallel so as to face the outside (upper side in FIG. 3) in the vehicle width direction (vertical direction in FIG. 3). The outlet side end and the inlet side end of the casing 4 are brought close to each other and connected to each other so that the flow of the exhaust gas 6 is folded back by the communication flow path 5, and the arrangement space occupied in the longitudinal direction of the frame 7 is minimized. Measures may be taken.

  Here, the casings 3 and 4 each holding the particulate filter 1 and the selective catalytic reduction catalyst 2 are supported from the frame 7 side by a support member not shown in FIG.

  In FIG. 3, reference numeral 8 denotes a tail pipe connected to the outlet end portion of the downstream casing 4 housing the selective catalytic reduction catalyst 2.

  Further, as prior art document information related to this type of exhaust purification device, there are the following Patent Documents 1 and 2 and the like.

JP 2011-43078 A JP 2009-108685 A

  However, when the layout as described above is adopted, the exhaust pipe 9 that guides the exhaust gas 6 from the engine (not shown) extends inside the frame 7 (lower side in FIG. 3) and reaches the vicinity of the particulate filter 1. Under the frame 7, it is connected to the gas inlet 3a of the casing 3 of the particulate filter 1 outside the frame 7 (upper side of the frame 7 in FIG. 3). Since it was arrange | positioned according to the position of the axial center 3x of the entrance side edge part of the casing 3, as FIG. 4 shows the arrow view of the IV-IV direction of FIG. 3, the position of the casing 3 of the particulate filter 1 There is a problem that the ground height h of the casing 3 is reduced and the possibility of being damaged by flying stones when traveling on rough roads is increased.

  The present invention has been made in view of the above-described circumstances, and holds an after-treatment device such as a particulate filter in a casing and places the axial center of the casing toward the outside in the vehicle width direction outside the vehicle frame. An object of the present invention is to provide an exhaust emission control device that can secure a ground clearance as much as possible even if it is arranged.

According to the present invention, an axial center of a casing that holds an aftertreatment device that allows exhaust gas to pass therethrough is placed in a state in which the axial center is directed outward in the vehicle width direction, and an inner end thereof is used as an exhaust gas inlet end . Exhaust gas purification arranged on the outside of the frame and led to the vicinity of the aftertreatment device through the inside of the frame to be hidden under the frame and connected to the gas inlet at the inlet end of the casing The apparatus is characterized in that the gas inlet is arranged so as to be eccentric downward with respect to the axial center of the casing.

  Thus, in this way, the gas inlet is arranged eccentrically downward with respect to the axial center of the casing. Therefore, the exhaust pipe which is hidden under the frame and extends outward from the inside of the frame is provided with the gas. In connecting to the inlet, it is possible to connect the gas inlet and the exhaust pipe by slightly lowering the position of the casing, and the ground clearance of the casing is ensured as much as possible.

  Further, when concretely carrying out the present invention, for example, the post-processing device can be a particulate filter that collects particulates in exhaust gas, and in this way, the casing of the particulate filter It is possible to secure the ground clearance as much as possible.

  According to the above-described exhaust gas purification apparatus of the present invention, the after-treatment device such as the particulate filter is held by the casing, and the casing is disposed outside the vehicle frame in a state where the axis of the casing is directed outward in the vehicle width direction. However, the ground clearance can be secured as much as possible, and an excellent effect that the possibility of damage to the casing due to flying stones or the like when traveling on rough roads can be remarkably reduced can be achieved.

It is a side view which shows an example of the form which implements this invention. It is a top view which shows another example of a form of this invention. It is a top view which shows a prior art example. FIG. 4 is an arrow view in the IV-IV direction of FIG. 3.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view showing an example of an embodiment for carrying out the present invention, and corresponds to a view taken along arrows IV-IV in FIG. 3 used for explaining a conventional example. Here, since the plan view of the present embodiment is substantially the same as that of FIG. 3, the following description will refer to FIG. 3 as equivalent to the plan view of the present embodiment.

  As in the layout described with reference to FIGS. 3 and 4, the exhaust purification apparatus of the present embodiment has the particulate filter 1 and the selective catalytic reduction catalyst 2 outside the vehicle frame 7 (upper side in FIG. 3). Are arranged in parallel so that the axial centers 3x and 4x of the casings 3 and 4 are respectively directed toward the outside (upper side in FIG. 3) in the vehicle width direction (vertical direction in FIG. 3). FIG. 3 and FIG. 4 show an example in which the outlet end portion of the casing 3 and the inlet end portion of the casing 4 are brought close to each other and connected to each other so that the flow of the exhaust gas 6 is turned back by the communication flow path 5. The part which attached | subjected the same code | symbol represents the same thing.

However, in this embodiment, the gas inlet 3a at the inlet end on the inner side in the vehicle width direction of the casing 3 holding the upstream particulate filter 1 is offset downward with respect to the axial center 3x of the casing 3. The exhaust pipe 9 that is arranged in the center and led to the vicinity of the particulate filter 1 through the inside of the frame 7 is hidden under the frame 7 and connected to the gas inlet 3a.

  Thus, in this way, since the gas inlet 3a is arranged eccentrically downward with respect to the axial center 3x of the casing 3, it is hidden under the frame 7 from the inside of the frame 7 and projects outward. When connecting the exhaust pipe 9 to the gas inlet 3a, it is possible to connect the gas inlet 3a and the exhaust pipe 9 only by slightly lowering the position of the casing 3, and the ground height h of the casing 3 is secured as much as possible. Will be.

  Therefore, according to the above embodiment, even if the particulate filter 1 is held by the casing 3 and the axial center 3x of the casing 3 is directed outward in the vehicle width direction, it is disposed on the outside of the frame 7 of the vehicle. High h can be secured as much as possible, and the possibility of damage to the casing 3 due to flying stones or the like when traveling on rough roads can be remarkably reduced.

  FIG. 2 shows another embodiment of the present invention. In the embodiment shown in FIG. 1, the selective reduction catalyst 2 is arranged in parallel on the downstream side of the particulate filter 1. As shown in FIG. 2, the particulate filter 1 may be held by the casing 3 and installed alone, and even in this case, by arranging the gas inlet 3 a eccentrically, As in the case of the embodiment, the ground height h of the casing 3 can be as large as possible.

  The exhaust emission control device of the present invention is not limited to the above-described embodiment. The aftertreatment device held by the casing is not necessarily limited to the particulate filter. Of course, various changes can be made without departing from the scope.

1 Particulate filter (post-processing device)
3 Casing 3a Gas inlet 3x Axle 6 Exhaust gas 7 Frame 9 Exhaust pipe

Claims (2)

The casing centering on the post-treatment device that passes the exhaust gas to be purified is placed in a state in which the axial center of the casing faces outward in the vehicle width direction, and the inner end of the casing is located outside the vehicle frame with the exhaust gas inlet end. An exhaust purification device that is arranged and is connected to a gas inlet at an inlet side end portion of the casing by letting an exhaust pipe led through the inside of the frame to the vicinity of the aftertreatment device under the frame. The exhaust gas purification apparatus is characterized in that the gas inlet is eccentrically disposed downward with respect to the axial center of the casing.   The exhaust purification device according to claim 1, wherein the aftertreatment device is a particulate filter that collects particulates in the exhaust gas.

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