JP4414453B2 - Hanging point structure of exhaust purification system - Google Patents

Description

  The present invention relates to a suspending point structure for suspending an exhaust gas purification device for an internal combustion engine mounted on an automobile from a suspension tool during vehicle assembly or maintenance.

  An automobile is provided with an exhaust purification device for removing carbon monoxide and hydrocarbons in the exhaust of the engine with a catalyst. In particular, a diesel engine has recently been used to remove PM (particulate matter). An exhaust emission control device that integrates a DPF (Diesel Particulate Filter) is employed (see Patent Documents 1 and 2).

In such an exhaust purification device integrated with a DPF, the weight increases, so the burden on the worker increases during vehicle assembly and maintenance. Therefore, a suspension point is provided in the exhaust purification device, and a machine such as a crane is installed. It is desirable to suspend the exhaust purification device and use it to assist the desorption operation of the exhaust purification device.
JP 2006-17018 A JP 2006-336506 A

  However, when the exhaust purification device is arranged in the immediate vicinity of the exhaust manifold and the exhaust purification device is arranged vertically so that the exhaust flows downward, the exhaust purification device is formed so as to gradually expand toward the large-diameter catalyst housing portion. Since the cone portion is located at the upper end, it is conceivable to provide a suspension point here.

  However, in recent years, this cone part is often manufactured by pressing a plate material due to the idea of low heat mass, and when the stay that becomes a hanging point is welded to this cone part, the strength of the cone part itself is also reduced. In addition, since the welded portion of the stay becomes a weak point in terms of strength, there arises a problem that the durability reliability of the exhaust purification device is lowered.

  On the other hand, in order to solve such a problem in terms of strength, it is conceivable to secure the necessary strength by increasing the plate thickness. However, in this case, the effect of reducing the heat mass is reduced, which is not desirable.

  In addition, in the configuration in which the stay that becomes the suspension point is joined to the cone part, the number of parts increases because a new stay is added, and the work to join the stay to the cone part is required, so the number of manufacturing steps is increased. There are increasing difficulties.

  The present invention has been devised to solve such problems of the prior art, and its main purpose is to avoid a decrease in durability reliability of the exhaust purification device and a decrease in the effect of low heat mass. An object of the present invention is to provide a hanging point structure of an exhaust emission control device configured to be able to do this. Another object of the present invention is to avoid an increase in the number of parts and the number of manufacturing steps.

In order to solve such a problem, in the present invention, as shown in claim 1, a suspension point for suspending an exhaust purification device (1) of an internal combustion engine mounted on an automobile on a suspension (53) In the structure, the exhaust purification device is arranged so that the exhaust gas flows in a substantially vertical direction, and is connected to an end portion of an exhaust passage member (tubular member 32) communicating with another adjacent exhaust device (supercharger 3). The provided flange plate (33) for connection is provided at the upper end, and the hook engaging hole (51) through which the hook is inserted is provided as a hanging point on the flange plate.

  According to this, the flange plate itself is highly rigid compared to other components, and in order to maintain airtightness, the flange plate and the exhaust passage member are closely joined to each other, and has high joint rigidity. Compare the exhaust passage member because the load acting on the exhaust passage member from the flange plate is evenly distributed over the entire circumference of the exhaust passage member having a closed cross section, and no large stress is partially generated in the exhaust passage member As a press-formed product of a thin plate material, there is no problem in strength, and the durability and reliability of the exhaust emission control device can be ensured, and a decrease in the effect of low heat mass can be avoided.

In addition , it is not necessary to newly add a dedicated member for securing the suspension point and join with the casing of the exhaust purification device, so that it is possible to avoid an increase in the number of parts and the number of manufacturing steps, thereby reducing the manufacturing cost. The increase can be suppressed.

In the suspending point structure of the exhaust gas purification device, as shown in claim 2 , an end portion of the exhaust passage member is opened sideways so as to communicate with the other exhaust device located on the side of the exhaust passage member. In addition, the suspension member engaging hole may be provided in the upper portion of the flange plate extending in the vertical direction.

According to this, the exhaust gas purification device can be stably suspended. In addition, another exhaust device connected to the exhaust purification device is located on the side of the flange plate, and the other exhaust device obstructs the attachment / detachment of the suspension device to / from the suspension engagement hole performed from above. Therefore, workability can be improved.

  As described above, according to the present invention, the flange plate itself is higher in rigidity than other components, and further, no large stress is generated in the exhaust passage member joined to the flange plate. Even if the passage member is a press-formed product made of a relatively thin plate material, there is no problem in strength, the durability reliability of the exhaust gas purification device can be ensured, and the lowering of the effect of low heat mass can be avoided. In addition, it is not necessary to newly add a dedicated member for securing the suspension point and join with the casing of the exhaust gas purification apparatus, so that an increase in the number of parts and manufacturing man-hours is avoided and an increase in manufacturing cost is suppressed. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an exhaust emission control device to which the present invention is applied. This exhaust purification device 1 is provided alongside a diesel engine (internal combustion engine) mounted on an automobile, is vertically arranged so that exhaust flows downward, and is exhausted from an exhaust port of a cylinder head (not shown). Exhaust gas that has flowed through the exhaust manifold 2 and the turbine section 4 of the supercharger 3 is introduced from above, flows downward in the interior, and then is discharged from below, for example, extending to the rear of the vehicle body through the lower side of the diesel engine Led to the exhaust pipe.

  This exhaust purification device 1 is accommodated in a casing 13 in a state where two upstream and downstream purification members 11 and 12 are arranged in series, and the upstream and downstream purification members 11 and 12 are respectively connected to a DOC. Diesel Oxidation Catalyst (Diesel Oxidation Catalyst) and DPF (Diesel Particulate Filter, Diesel Exhaust Particulate Filter), which continuously burns and removes PM (particulate matter) collected in DPF (CR-DPF).

  Exhaust pressure pipes 14 and 15 are attached to the positions between the two purification members 11 and 12 and the downstream side of the downstream purification member 12, so that the downstream purification member (DPF) The differential pressure before and after is detected, and the amount of particulate accumulation in the DPF is estimated. Further, a temperature sensor 16 is attached at a position between the two purification members 11 and 12, thereby detecting the exhaust gas temperature raised by the oxidation reaction heat of the oxidation catalyst constituting the purification member 11.

  The casing 13 includes a substantially cylindrical main body portion 17 in which the purification members 11 and 12 are accommodated and held, a cone portion 18 provided at the upper end of the main body portion 17 for connection to the upstream supercharger 3, and a downstream side. The main body portion 17 has a cone portion 19 provided at the lower end for connection with the side exhaust pipe.

  FIG. 2 is a front view of the exhaust emission control device 1 shown in FIG. FIG. 3 is a side view of the exhaust emission control device 1 shown in FIG. FIG. 4 is a cross-sectional view showing the cone portion 18 at the upper end of the exhaust gas purification apparatus 1 shown in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG.

  As shown in FIG. 5, the upper cone portion 18 includes a cone member 31, a tubular member 32, and a flange plate 33. The tubular member 32 includes an upper divided body 34 and a lower divided body 35. The upper divided body 34 and the lower divided body 35 of the cone member 31 and the tubular member 32 are both manufactured by pressing a steel plate (for example, a stainless steel material) and joined together by welding.

  The cone member 31 is formed so as to gradually expand toward the large-diameter main body portion 17 that accommodates the purification members 11 and 12, and the opening end surfaces of the inlet end portion 37 and the outlet end portion 38 are not parallel to each other. It has a truncated cone shape.

  The tubular member 32 is provided with a flange having an inlet end 45 opened laterally and extending radially from the inlet end 45 of the tubular member 32 in order to communicate with the side supercharger 3. The plate 33 extends in the vertical direction. The flange plate 33 is connected to the housing 41 of the turbine section of the side turbocharger 3 by bolts 42 and nuts 43.

  The tubular member 32 has an L-shaped tube shape in which the inlet end portion 45 opens sideways and the outlet end portion 46 opens downward, and the opening end surfaces of the inlet end portion 45 and the outlet end portion 46 are orthogonal to each other. The flow direction of the exhaust gas introduced laterally from the exhaust discharge port 47 provided in the housing 41 of the turbine unit 4 is changed downward by the tubular member 32 as indicated by an arrow in FIG.

  The upper divided body 34 and the lower divided body 35 constituting the tubular member 32 are divided in a horizontal plane by a divided plane substantially parallel to the opening end face of the outlet end portion 46, and the upper divided body 34 has a semicircular cross section. The lower divided body 35 includes a portion 35a having a semicircular arc-shaped cross section and a portion 35a side having this bowl shape. It is composed of an open U-shaped cross-section portion 35b and an oval-shaped cylindrical portion 35c to which the cone member 31 is connected.

  The upper divided body 34 is provided with a mounting hole 49 for an exhaust sensor (not shown) for detecting the exhaust state of the diesel engine, for example, a LAF (Linear Air Fuel Ratio) sensor for detecting the air-fuel ratio of the exhaust. The exhaust sensor is fixed in a state where the tip end portion projects into the exhaust passage in the tubular member 32.

  The inlet end portion 45 of the tubular member 32 has a circular cross section as a whole at the hook-like portions 34a and 35a of the upper divided body 34 and the lower divided body 35, and the flange plate 33 is formed by fillet welding or the like. Joined with. Here, the tubular member 32 and the flange plate 33 are tightly joined over the entire circumference of the tubular member 32 so as to obtain airtightness, whereby high joining rigidity is obtained.

  As shown in FIG. 4, the flange plate 33 has bolt insertion holes 44 through which bolts 42 to be connected to the supercharger 3 are inserted at equal intervals in the circumferential direction. A plurality (three in this case) are provided at positions equidistant from the center.

  In addition, the flange plate 33 is provided with a long hole-like hanger engaging hole (hanger engaging portion) 51 which is a hanging point when the exhaust purification device 1 is hung. The hanger engagement hole 51 is provided at a position closer to the exhaust manifold 2 than the upper bolt insertion hole 44, and the hanger engagement hole 51 is on a vertical line passing through the center of gravity of the exhaust gas purification apparatus 1 in the installed state or The exhaust purification device 1 is suspended from the suspension in a well-balanced position.

  In the exhaust emission control device 1 configured as described above, as shown in FIGS. 2 and 3, the exhaust emission control device 1 is suspended by hooking the suspension 53 into the suspension engagement hole 51 of the flange plate 33 at the upper end. can do. At this time, a load corresponding to the weight of the exhaust purification device 1 acts on the flange plate 33, but the load applied from the flange plate 33 to the tubular member 32 is uniformly distributed over the entire circumference of the tubular member 32 having a closed cross section. A large stress is not partially generated in the tubular member 32, and high durability reliability can be ensured.

  Further, as shown in FIG. 1, the supercharger 3 connected to the exhaust emission control device 1 is located on the side of the flange plate 33, and the attachment / detachment of the suspension 53 to / from the suspension engagement hole 51 performed from above is performed. Since work can be performed smoothly without being obstructed by the supercharger 3, workability can be improved.

  In the above example, the hanging member engaging hole 51 is provided in the flange plate 33 as a hanging member engaging portion for hooking the hanging device 53, but the hanging member engaging portion in the present invention is not limited to this. For example, a protrusion may be provided on the flange plate 33 as long as the suspension member 53 can be engaged therewith.

It is a perspective view showing a catalytic converter to which the present invention is applied. It is a front view of the exhaust emission control device shown in FIG. It is a side view of the exhaust emission control device shown in FIG. It is sectional drawing which shows the cone part of the upper end of the exhaust gas purification apparatus shown in FIG. It is sectional drawing cut | disconnected by the VV line | wire of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust purification device 3 Supercharger 11 * 12 Purifying member 13 Casing 17 Main body part 18 Cone part 19 Cone part 31 Cone member 32 Tubular member (exhaust passage member)
33 Flange plate 45 Entrance end 51 Lifter engagement hole (suspender engagement part)
53 Suspension

Claims (3)

A hanging point structure for suspending an exhaust gas purification device of an internal combustion engine mounted on an automobile on a hanging tool,
The exhaust purification device includes a flange plate for connection provided at an end of an exhaust passage member that is arranged so that the exhaust gas flows in a substantially vertical direction and communicates with another adjacent exhaust device. A hanging point structure of an exhaust emission control device, wherein a hanging member engaging hole through which a hanging member is inserted is provided as a hanging point on a flange plate. In order to communicate with the other exhaust device located on the side of the exhaust passage member, an end portion of the exhaust passage member is opened laterally, and the suspension member is attached to an upper portion of the flange plate extending in the vertical direction. The suspension point structure of the exhaust emission control device according to claim 1, wherein a joint hole is provided. The suspension point structure of the exhaust emission control device according to claim 2, wherein the lifting tool engaging hole is provided on a vertical line passing through the center of gravity of the exhaust purification device or in the vicinity thereof in the installed state .

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