JP2013124562A - Clearance adjusting mechanism of pipe line structure for exhaust and clearance adjusting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a clearance in a radial direction between an exhaust pipe and a tail pipe.SOLUTION: In a pipe line structure for exhaust comprising an exhaust pipe 59 and a tail pipe 2, a tip end 59a of the exhaust pipe 59 is inserted into an opening inlet end of the tail pipe 2, the tip end 59a of the exhaust pipe 59 is overlapped with the opening inlet end of the tail pipe 2 with a clearance C in the radial direction, and a cylindrical member 3 capable of being displaced in an optional radial direction within the clearance is detachably provided in the opening inlet end of the tail pipe 2.

Description

  The present invention relates to clearance adjustment of an exhaust pipe structure, and in particular, to an improvement of the structure for adjusting a radial clearance between an exhaust pipe and a tail pipe.

Conventionally, in an exhaust pipe structure for an industrial vehicle, for example, a clearance is formed between a discharge side tip of an exhaust pipe of a muffler and an opening inlet end of a tail pipe into which the tip is inserted, so that the exhaust gas flows. It is known that the exhaust gas temperature is reduced by introducing the outside air into the tail pipe from the clearance when exhaust gas is discharged from the exhaust pipe by using the ejector effect that occurs along with the exhaust gas. (See Fig. 1 of Kaihei 4-83826).
The

  On the other hand, since it is necessary to conform to the 4th exhaust gas regulation, industrial vehicle manufacturers collect particulate matter (PM) contained in exhaust gas of diesel engines and remove it from the exhaust gas. It is required to install an exhaust treatment device such as a diesel particulate filter (Diesel Particulate Filter) in the exhaust system of the engine.

  Particulate matter collected by the diesel particulate filter can be burned using the high-temperature exhaust gas introduced into the diesel particulate filter. At a high temperature (about 600 ° C.). Therefore, it is conceivable to reduce the exhaust gas temperature by applying the outside air introduction structure based on the ejector effect that has been used in the conventional exhaust system to the exhaust part of the diesel particulate filter.

  However, when a muffler or a diesel particulate filter is mounted on a vehicle, the muffler and the diesel particulate filter are connected via an elastic member such as rubber (that is, rubber) to prevent the occurrence of resonance due to engine vibration. It can be attached to the vehicle (by mounting support).

  For this reason, the annular clearance formed between the tip of the exhaust pipe connected to the muffler and diesel particulate filter and the opening inlet end of the tail pipe is not uniform, and either side in the radial direction As a result, the ejector effect may be reduced, and the exhaust gas temperature may not be sufficiently reduced.

  The present invention has been made in view of such conventional circumstances, and an object of the present invention is to make it possible to adjust the radial clearance between the exhaust pipe and the tail pipe. In particular, the present invention is intended to allow the clearance between the exhaust pipe and the tail pipe to be formed evenly in the circumferential direction.

  In order to solve the above-described problems, a clearance adjusting mechanism for an exhaust pipe structure according to the present invention includes an exhaust pipe and a tail pipe, and a clearance in a radial direction between an opening inlet end of the tail pipe and a distal end portion of the exhaust pipe. And a cylindrical member that can be displaced in an arbitrary radial direction within the clearance is disposed in the clearance (see claim 1).

  According to the present invention, the cylindrical member that can be displaced in an arbitrary radial direction is disposed in the radial clearance formed between the opening inlet end of the tail pipe and the tip of the exhaust pipe. When the clearance is unevenly formed in the circumferential direction (that is, when the clearance is biased toward any radial direction), the cylindrical member is displaced in the radial direction, thereby forming a cylindrical shape. The radial clearance between the tip of the exhaust pipe and the opening inlet end of the tail pipe can be adjusted via the member. As a result, the clearance between the distal end portion of the exhaust pipe and the opening inlet end of the tail pipe can be evenly formed in the circumferential direction.

  As a result, when exhaust gas is discharged from the exhaust pipe, the ejector effect generated along with the flow of the exhaust gas can be reliably generated over the circumferential direction of the clearance, and outside air can be effectively introduced from the clearance into the tail pipe. As a result, the exhaust gas temperature can be reliably reduced.

  Further, in the present invention, the inner diameter of the opening inlet end of the tail pipe is larger than the outer diameter of the distal end portion of the exhaust pipe, and the distal end portion of the exhaust pipe is inserted into the opening inlet end of the tail pipe. A shaped member is detachably provided at the opening inlet end of the tail pipe or the tip of the exhaust pipe (see claim 2).

  In the present invention, the tubular member has a first projecting portion that projects to the outer periphery, and the first projecting portion is attached to and detached from the opening inlet end of the tail pipe or the mounting portion provided on the exhaust pipe. It is attached freely (see claim 3).

  In the present invention, the mounting portion is constituted by a second projecting portion projecting from the opening inlet end of the tail pipe or the outer periphery from the exhaust pipe (see claim 4).

  In the present invention, the first overhanging portion is attached to the second overhanging portion with an attachment screw, and the attachment screw is inserted into the insertion hole of the attachment screw formed in the first overhanging portion. When inserted into the hole, the cylindrical member has a size and an arrangement such that the cylindrical member is displaced to an arbitrary radial position within the clearance (see claim 5).

  In the present invention, the insertion hole for the mounting screw is formed of a pair of holes (that is, so-called “fool holes”) that are spaced apart in the radial direction and have a larger play than the outer diameter of the mounting screw. 6).

  In the present invention, the first projecting portion projects from one end of the tubular member to the outer periphery (see claim 7).

  In the present invention, the second overhanging portion is provided at a position away from the distal end portion of the exhaust pipe (see claim 8).

  In the present invention, the distal end portion of the exhaust pipe is formed in a tapered shape that gradually decreases in diameter toward the distal end portion (see claim 9).

  In this invention, the cylindrical member is comprised from the 1st, 2nd half member which each has a half-circle shape with a cross-sectional semicircle shape (refer Claim 10).

  In the present invention, the exhaust pipe is connected to a diesel particulate filter (see claim 11). In the case of a diesel particulate filter, since the exhaust gas temperature is generally very high (about 600 ° C.), the clearance formed between the tail pipe opening inlet end and the exhaust pipe front end as in the present invention is reduced. By adjusting and effectively introducing outside air into the tail pipe over the circumferential direction of the clearance when exhausting from the diesel particulate filter to the exhaust pipe, the exhaust temperature of the diesel particulate filter is reliably reduced it can.

  In the present invention, the tail pipe is fixed to the vehicle body side (see claim 12).

  In the present invention, the exhaust pipe structure is used in an industrial vehicle (see claim 13).

  A clearance adjustment method for an exhaust pipe structure according to the present invention includes an exhaust pipe and a tail pipe, and an opening inlet end of the tail pipe is overlapped with a distal end portion of the exhaust pipe with a radial clearance therebetween. In the exhaust piping structure, a cylindrical member is disposed in the clearance, and the clearance is adjusted by adjusting the radial position of the cylindrical member (see claim 14).

  According to the present invention, the cylindrical member is disposed in the radial clearance formed between the opening inlet end of the tail pipe and the tip of the exhaust pipe, and the radial position of the cylindrical member is adjusted. By adjusting the radial position of the tubular member when the clearance is unevenly formed in the circumferential direction (that is, when the clearance is biased toward one of the radial directions) The radial clearance between the tip of the exhaust pipe and the opening inlet end of the tail pipe can be adjusted via the cylindrical member. As a result, the clearance between the distal end portion of the exhaust pipe and the opening inlet end of the tail pipe can be evenly formed in the circumferential direction.

  As a result, when exhaust gas is discharged from the exhaust pipe, the ejector effect generated along with the flow of the exhaust gas can be reliably generated over the circumferential direction of the clearance, and outside air can be effectively introduced from the clearance into the tail pipe. As a result, the exhaust gas temperature can be reliably reduced.

  As described above, according to the present invention, the cylindrical member is disposed in the radial clearance formed between the opening inlet end of the tail pipe and the tip of the exhaust pipe, and the cylindrical member is disposed in the radial direction. Since the radial position of the cylindrical member is adjusted, the clearance can be adjusted via the cylindrical member when the clearance is unevenly formed in the circumferential direction. It becomes possible to form evenly in the direction. As a result, when exhaust gas is discharged from the exhaust pipe, the ejector effect generated along with the flow of the exhaust gas can be reliably generated over the circumferential direction of the clearance, and outside air can be effectively introduced from the clearance into the tail pipe. The exhaust gas temperature can be reliably reduced.

1 is a schematic configuration diagram of an exhaust system including an exhaust piping structure of a forklift that employs a clearance adjustment mechanism according to an embodiment of the present invention. It is a figure which expands and shows the said piping structure for exhaust (FIG. 1). (A) is a front view of the cylindrical member which comprises the said clearance adjustment mechanism, (b) is the bottom view. (A) And (b) is a figure for demonstrating the effect of the said clearance adjustment mechanism. It is a figure which shows the modification of the said cylindrical member (FIG. 3), Comprising: (a) is a front view of a cylindrical member, (b) is the bottom view. It is a figure which expands and shows the piping structure for exhaust_gas | exhaustion by which the clearance adjustment mechanism by other Example of this invention was employ | adopted, Comprising: It is a figure equivalent to FIG. 2 of the said Example.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an exhaust system including an exhaust piping structure to which a clearance adjusting mechanism according to an embodiment of the present invention is applied. Here, the exhaust pipe of a diesel particulate filter (Diesel Particulate Filter) mounted on a forklift will be described as an example. A diesel particulate filter is a device for collecting particulate matter (PM) contained in exhaust gas of a diesel engine and removing it from the exhaust gas.

  As shown in FIG. 1, the diesel particulate filter 50 is supported by frames 51 and 52 via rubber mount support mechanisms, respectively. The rubber mount support mechanism is sandwiched between the angle plate 53 fixed to the diesel particulate filter 50, the angle plate 54 fixed to the sub-frame 51A of the frame 51 or the frame 52, and the angle plates 53 and 54. And a mount rubber 55 that is fastened and fixed to each angle plate 53 and 54 by a bolt 57 that passes through each angle plate 53 and 54 and a nut 57 that is screwed to the tip of the bolt 56.

  An exhaust pipe 58 through which exhaust gas discharged from an engine (not shown) is introduced is connected to the exhaust gas introduction side of the diesel particulate filter 50, and the tail pipe 2 is connected to the exhaust gas outlet side. An exhaust pipe 59 extending toward is connected. The tail pipe 2 extends upward (upward in FIG. 1), has an exhaust port 2a at its upper end (opening outlet end), and a portion near the upper end is attached to the support frame 100 of the head guard of the forklift. It is fixed through. A clearance adjusting mechanism 1 according to the present embodiment is provided between the distal end portion of the exhaust pipe 59 and the opening entrance end of the tail pipe 2.

  As shown in FIG. 2, the outer diameter of the distal end portion 59 a of the exhaust pipe 59 is smaller than the inner diameter of the opening inlet end of the tail pipe 2, and the distal end portion 59 a of the exhaust pipe 59 is the opening inlet end of the tail pipe 2. Has been inserted. The distal end portion 59a of the exhaust pipe 59 and the opening inlet end of the tail pipe 2 overlap each other with a radial clearance C therebetween. Further, the distal end portion 59a of the exhaust pipe is formed in a tapered shape that gradually becomes smaller in diameter toward the distal end. In the clearance C, the cylindrical member 3 which comprises the clearance adjustment mechanism 1 is arrange | positioned. The tubular member 3 is detachably attached to a flange portion (second overhanging portion) 20 that protrudes to the outer periphery at the opening inlet end of the tail pipe 2 via an attachment screw 4. The flange portion 20 is formed with a screw hole into which the screw portion 40 of the mounting screw 4 is screwed.

  As shown in FIG. 3, the cylindrical member 3 has a through-hole 30 </ b> A having a circular cross section, is formed at a thin cylindrical portion 30 whose upper and lower ends are opened, and a lower end of the cylindrical portion 30. It has an overhanging flange portion (first overhang portion) 31. The inner diameter of the through hole 30 </ b> A of the cylindrical portion 30 is larger than the outer diameter of the distal end portion 59 a of the exhaust pipe 59, and the outer diameter of the cylindrical portion 30 is smaller than the inner diameter of the opening inlet end of the tail pipe 2. . The flange portion 31 is formed with a pair of insertion holes 31a through which the mounting screws 4 are inserted. Here, each insertion hole 31a is spaced apart in the radial direction, that is, arranged at a position 180 degrees apart in the circumferential direction. Each insertion hole 31a has an inner diameter that is larger in play than the outer diameter of the screw portion 40 of the mounting screw 4, and each insertion hole 31a is a so-called “fool hole” (see FIG. 2).

  With this configuration, the screw portion 40 of the attachment screw 4 is inserted into each insertion hole 31 a of the flange portion 31 of the cylindrical member 3, and the screw portion 40 of the attachment screw 4 is screwed into the screw hole of the flange portion 20 of the tail pipe 2. In the temporarily fixed state in which the mounting screw 4 is not tightened when being combined, the flange portion 31 of the tubular member 3 is radially aligned by the amount of play between the screw portion 40 of the mounting screw 4 and the insertion hole 31a. It can be moved freely. As a result, the cylindrical member 3 can be displaced in an arbitrary radial direction within the clearance C so that the radial position can be adjusted. As a result, the clearance between the distal end portion 59a of the exhaust pipe 59 can be adjusted. C is adjusted. A washer 41 is interposed between the head of the mounting screw 4 and the flange portion 31 of the cylindrical member 3 so that the head of the mounting screw 4 does not fit into the insertion hole 31a. Yes.

Next, the function and effect of the clearance adjustment mechanism configured as described above will be described with reference to FIG.
4A and 4B show a state in which the flange portion 20 of the tail pipe 2 or the flange portion 31 of the tubular member 3 is viewed from below in FIG.

  As shown in FIG. 4A, when the exhaust pipe 59 of the diesel particulate filter 50 is inserted into the opening inlet end of the tail pipe 2, the exhaust pipe 59 is on either side of the tail pipe 2. It is assumed that they are arranged biased (in this case, the left side of the figure) (that is, misalignment occurs). At this time, the annular clearance C formed between the outer peripheral surface of the exhaust pipe 59 and the inner peripheral surface 2A of the tail pipe 2 is uneven in the circumferential direction. Here, the clearance C in the left part of FIG. 4A is small, and the clearance C in the right part of FIG. 4A is large.

  Next, as shown in FIG. 4B, the cylindrical portion 30 of the cylindrical member 3 is disposed between the outer peripheral surface of the exhaust pipe 59 and the inner peripheral surface 2 </ b> A of the tail pipe 2. By inserting the screw portion 40 of the mounting screw 4 into the insertion hole 31a of the flange portion 31 of the flange portion 31 and screwing the screw portion 40 into the screw hole 20a of the flange portion 20 of the tail pipe 2, the cylindrical member 3 is attached to the tail pipe. Temporarily fix to 2. From this state, by utilizing the play between the screw portion 40 and the insertion hole 31a, the tubular member 3 is displaced in the radial direction, and the radial position of the tubular member 3 is adjusted. The center of the cylindrical portion 30 is aligned with the center of the exhaust pipe 59 (that is, both members are centered). Thereafter, the mounting screw 4 is tightened to fix the cylindrical member 3 to the flange portion 20 of the tail pipe 2.

  In this state, the cylindrical member 3 is provided integrally with the tail pipe 2, and the larger clearance C is covered with the flange portion 31 of the cylindrical member 3 between the exhaust pipe 59 and the tail pipe 2. Thus, by adjusting the larger clearance C to the smaller clearance C, the clearance C becomes uniform over the entire circumferential direction (that is, the entire circumference) (see FIG. 4B).

  As a result, when exhaust gas is discharged from the exhaust pipe 59, the ejector effect generated along with the flow of the exhaust gas can be reliably generated over the entire circumference of the exhaust pipe 59. The outside air can be effectively introduced into the interior, and the exhaust gas temperature can be reliably reduced.

  Further, in this case, the tip 5a of the exhaust pipe 5 is formed in a tapered shape (that is, a nozzle shape) that gradually decreases in diameter toward the tip, so that the tail pipe 2 is exhausted from the exhaust pipe 5. Thus, the negative pressure at the opening inlet end can be increased, whereby the amount of outside air introduced into the tail pipe 2 can be increased.

  When the tubular portion 30 of the tubular member 3 is disposed between the outer peripheral surface of the exhaust pipe 59 and the inner peripheral surface 2A of the tail pipe 2, before inserting the exhaust pipe 59 into the tail pipe 2, The cylindrical part 30 of the cylindrical member 2 is placed on the diesel particulate filter 50 side by covering the exhaust pipe 59, and after inserting the exhaust pipe 59 into the tail pipe 2, the cylindrical member 3 is attached to the tail pipe. The flange portion 31 of the cylindrical member 3 is temporarily fixed to the flange portion 20 of the tail pipe 2 with the mounting screw 4 or before the exhaust pipe 59 is inserted into the tail pipe 2. In addition, the flange portion 31 of the cylindrical member 3 may be temporarily fixed to the flange portion 20 of the tail pipe 2 with the mounting screw 4 in advance.

  Further, in this case, since the insertion hole 31a of the flange portion 31 of the cylindrical member 3 is formed from a hole having a large play with respect to the screw portion 40 of the mounting screw 4, when displacing the cylindrical member 3, The cylindrical member 3 can be displaced in an arbitrary radial direction, which facilitates adjustment of the radial position of the cylindrical member 3.

  In the said Example, although the cylindrical member 3 showed the example comprised from the single member, application of this invention is not limited to this. FIG. 5 shows a modification of the cylindrical member. In the figure, the same reference numerals as those in FIG. 3 denote the same or corresponding parts.

As shown in FIG. 5, the tubular member 3 has a split split type structure into two in longitudinal section S passing through the central axis line, the first half member 30 ₁ and the second half and a split member 30 _2.

The first half member 30 _1, the upper and lower ends are open semicylindrical tubular portion 30 ₁ of the thin-walled, formed at the lower end of the tubular portion 30 _1, a semicircular plate-like flange portion protruding to the outer periphery and (first projecting portion) 31 having a ₁ and. Inner diameter of the through-holes 30A ₁ of the cylindrical portion 30 ₁ is larger than the outer diameter of the distal end portion 59a of the exhaust pipe 59, the outer diameter of the tubular portion 30 ₁ is smaller than the inner diameter of the opening inlet end of the tail pipe 2 It has become. Further, the flange portion 31 _1, a pair of insertion holes 31a ₁ of the attachment screw 4 is inserted is formed. Here, the insertion holes 31a ₁ is disposed 90 degrees away in the circumferential direction. Each insertion hole 31 a ₁ is formed from a so-called “fool hole” that has a larger play than the outer diameter of the screw portion 40 of the mounting screw 4.

The second half member 30 ₂ has the same configuration as the first half member 30 _1, the tubular portion 30 ₂ of the semi-cylindrical, formed at the lower end of the cylindrical portion 30 ₂ half disk-shaped flange portion (first projecting portion) and a 31 _2. Inner diameter of the through-holes 30A ₂ of the cylindrical portion 30 ₂ is larger than the outer diameter of the distal end portion 59a of the exhaust pipe 59, the outer diameter of the tubular portion 30 ₂ is smaller than the inner diameter of the opening inlet end of the tail pipe 2 It has become. Further, the flange portion 31 _2, a pair of insertion mounting screws 4 to the insertion hole 31a ₂ and is formed, the insertion holes 31a ₂ are arranged in 90 degrees away in the circumferential direction. Each insertion hole 31 a ₁ is formed from a so-called “fool hole” that has a larger play than the outer diameter of the screw portion 40 of the mounting screw 4.

In this case, first the tubular member 3 dividable, which is configured from the second half member ₃₀ 1, 30 _2, first, second half members ₃₀ 1, 30 ₂ tail The tubular member 30 can be disposed between the exhaust pipe 59 and the tail pipe 2 even after the exhaust pipe 59 is inserted into the tail pipe 2 by being separately attached to the pipe 2 and temporarily fixed with the mounting screws 4. Is possible.

Each half member 30 _1, 30 ₂ of the temporary stop after, as in the case of the embodiment, according to the direction and magnitude of the misalignment of the exhaust pipe 59 relative to the tail pipe 2, each half member 30 ₁ , 30 ₂ is displaced in the radial direction so as to be integrated, by adjusting the radial position of the tubular member 3, so as to match the center of the cylindrical portion 30 of the tubular member 3 in the center of the exhaust pipe 59 do it. Then, after the centering of both members is completed, the mounting screw 4 is tightened to fix the cylindrical member 3 to the flange portion 20 of the tail pipe 2.

  In this case, as in the above-described embodiment, before the exhaust pipe 59 is inserted into the tail pipe 2, the cylindrical portion 30 of the cylindrical member 2 is previously covered with the exhaust pipe 59, and the exhaust pipe 59 is connected to the tail pipe 2 Then, the cylindrical member 3 is moved to the tail pipe 2 side, and the flange portion 31 is temporarily fixed to the flange portion 20 of the tail pipe 2 with the mounting screw 4, or the exhaust pipe 59 is attached to the tail pipe 2. There is no need to temporarily fix the flange portion 31 of the cylindrical member 3 to the flange portion 20 of the tail pipe 2 with the mounting screw 4 before insertion, and after the exhaust pipe 59 is inserted into the tail pipe 2. However, since the cylindrical member 3 can be attached, the cylindrical member 3 can be easily attached (and removed).

  In the said Example, although the cylindrical member was attached to the tail pipe 2, the application of this invention is not limited to this. FIG. 6 shows an exhaust piping structure in which a clearance adjusting mechanism according to another embodiment of the present invention is employed. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts.

  As shown in FIG. 6, in this other embodiment, a cylindrical member 3 ′ is attached to the exhaust pipe 59 side. Similar to the cylindrical member 3 in the above embodiment, the cylindrical member 3 ′ has a thin cylindrical portion 30 ′ having a through hole 30 ′ A and having upper and lower ends opened, and a lower end of the cylindrical portion 30 ′. And a flange portion (first overhang portion) 31 ′ which is formed and projects to the outer periphery. The inner diameter of the through hole 30 </ b> A ′ of the cylindrical portion 30 ′ is larger than the outer diameter of the exhaust pipe 59, and the outer diameter is smaller than the inner diameter of the opening inlet end of the tail pipe 2. The flange portion 31 is formed with a pair of insertion holes (baka holes) 31 ′ a that are separated from each other in the radial direction and through which the mounting screw 4 is inserted.

  The tip portion 30'a of the cylindrical portion 30 'is formed in a taper shape (that is, a nozzle shape) that gradually decreases in diameter toward the tip. Further, a flange portion (second overhang portion) 59b that protrudes to the outer periphery is provided at a position away from the tip portion 59a in the exhaust pipe 59, and the screw portion 40 of the mounting screw 4 is provided on the flange portion 59b. Is formed with a screw hole.

  In this case, before inserting the exhaust pipe 59 into the tail pipe 2, the tubular member 3 ′ is covered with the exhaust pipe 59, and the flange portion 31 ′ of the tubular member 3 ′ is attached to the flange portion 59 b of the exhaust pipe 59. From this state, the exhaust pipe 59 is inserted into the tail pipe 2 together with the cylindrical member 3 ′. Thereafter, the cylindrical portion 30 ′ of the cylindrical member 3 ′ is displaced in the radial direction, and the clearance C between the outer peripheral surface of the cylindrical portion 30 ′ of the cylindrical member 3 ′ and the inner peripheral surface 2 A of the tail pipe 2. Adjust so that becomes even in the circumferential direction. After the adjustment of the clearance C, the flange portion 31 ′ of the tubular member 3 ′ is fixed to the flange portion 59 b of the exhaust pipe 59 with a mounting screw 4.

  As described above, even when the cylindrical member is disposed on the exhaust pipe 59 side, the clearance C between the exhaust pipe 59 and the tail pipe 2 can be adjusted, and the same effect as the above-described embodiment. Play.

  In the above embodiment, the exhaust pipe of a diesel particulate filter is shown as an example as a preferable example to which the clearance adjustment mechanism according to the present invention is applied. However, the present invention is also applicable to the exhaust pipe of a muffler body. It is.

  In the above embodiment, the present invention is applied to a forklift. However, the present invention can be applied to industrial vehicles other than forklifts, and can also be applied to engine vehicles other than industrial vehicles.

  As described above, the present invention is useful for an engine vehicle that requires clearance adjustment in an exhaust pipe structure that forms a radial clearance between an exhaust pipe and a tail pipe.

1: Clearance adjustment mechanism

2: Tail pipe 20: Flange (second overhang)

3, 3 ': Cylindrical member 31, 31': Flange part (1st overhang | projection part)
31a, 31'a: Insertion hole

4: Mounting screw

50: Diesel particulate filter 59: Exhaust pipe 59a: Tip

C: Clearance

Japanese Utility Model Publication No. 4-83826 (refer to FIG. 1)

Claims (14)

The clearance adjusting mechanism in an exhaust pipe structure having an exhaust pipe and a tail pipe and having an opening inlet end of the tail pipe overlapped with a distal end portion of the exhaust pipe with a radial clearance therebetween. And
A cylindrical member that can be displaced in any radial direction within the clearance is disposed within the clearance.
A clearance adjustment mechanism for an exhaust pipe structure. In claim 1,
The inner diameter of the opening inlet end of the tail pipe is larger than the outer diameter of the distal end portion of the exhaust pipe, and the distal end portion of the exhaust pipe is inserted into the opening inlet end of the tail pipe, The cylindrical member is detachably provided at the opening inlet end of the tail pipe or the tip of the exhaust pipe.
A clearance adjustment mechanism for an exhaust pipe structure. In claim 2,
The tubular member has a first projecting portion that projects to the outer periphery, and the first projecting portion is attached to and detached from the opening inlet end of the tail pipe or a mounting portion provided on the exhaust pipe. Attached freely,
A clearance adjustment mechanism for an exhaust pipe structure. In claim 3,
The mounting portion is configured by a second projecting portion projecting from the opening inlet end of the tail pipe or the exhaust pipe to the outer periphery,
A clearance adjustment mechanism for an exhaust pipe structure. In claim 4,
The first overhanging portion is attached to the second overhanging portion with a mounting screw, and the mounting screw is formed in an insertion hole of the mounting screw formed in the first overhanging portion. When inserted into the insertion hole, the cylindrical member has a size and an arrangement such that the cylindrical member is displaced to an arbitrary radial position within the clearance.
A clearance adjustment mechanism for an exhaust pipe structure. In claim 5,
The insertion hole of the mounting screw is formed of a pair of holes that are spaced apart in the radial direction and have a larger play than the outer diameter of the mounting screw.
A clearance adjustment mechanism for an exhaust pipe structure. In claim 3,
The first projecting portion projects from one end of the tubular member to the outer periphery;
A clearance adjustment mechanism for an exhaust pipe structure. In claim 4,
The second overhang is provided at a position away from the tip of the exhaust pipe;
A clearance adjustment mechanism for an exhaust pipe structure. In claim 1,
The tip of the exhaust pipe is formed in a tapered shape that gradually decreases in diameter toward the tip.
A clearance adjustment mechanism for an exhaust pipe structure. In claim 1,
The cylindrical member is composed of first and second half members each having a half shape with a semicircular cross section,
A clearance adjustment mechanism for an exhaust pipe structure. In claim 1,
The exhaust pipe is connected to a diesel particulate filter;
A clearance adjustment mechanism for an exhaust pipe structure. In claim 1,
The tail pipe is fixed to the vehicle body side,
A clearance adjustment mechanism for an exhaust pipe structure. In claim 1,
A clearance adjustment mechanism for an exhaust pipe structure, wherein the exhaust pipe structure is used in an industrial vehicle. The clearance adjustment method in an exhaust pipe structure having an exhaust pipe and a tail pipe and having an opening inlet end of the tail pipe overlap with a distal end portion of the exhaust pipe with a radial clearance therebetween. And
A cylindrical member is disposed within the clearance, and the clearance is adjusted by adjusting a radial position of the cylindrical member.
A clearance adjustment method for an exhaust pipe structure characterized by the above.

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