JP7206598B2 - Pipe mounting structure - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a pipe attachment structure for attaching a pipe to a fixed system.

2. Description of the Related Art In some exhaust systems of engines, a plurality of devices such as a supercharger turbine and an exhaust purification device are positioned upstream of and connected to a pipe that is an exhaust pipe.

JP-A-5-213075

In an exhaust system with such a structure, the position of the pipe is likely to shift due to the installation error of the device described above. In particular, when there are a plurality of the devices described above and the connection directions of these devices are different, the position of the pipe will shift three-dimensionally, making it difficult to attach the pipe to a fixed system such as a transmission.

Accordingly, the present disclosure has been created in view of such circumstances, and its object is to provide a pipe mounting structure capable of absorbing positional deviation and mounting a pipe to a fixing system.

According to one aspect of the present disclosure,
a pipe bracket extending upwardly from a pipe and having fastening surfaces formed on front and rear sides in the extending direction of the pipe;
a through hole formed through the pipe bracket in the front-rear direction;
a fitting groove formed in the pipe along the fastening surface;
a first bracket having a first fastening portion extending in the front-rear direction and arranged along the fixing system, and having a second fastening portion extending in the left-right direction and arranged along the fastening surface;
a second bracket disposed along the fastening surface opposite to the fastening surface on which the second fastening portion is disposed;
a detent portion provided on the second bracket and engaged with the first bracket;
a first bolt that fastens the first fastening portion to the fixing system;
a second bolt that fastens the pipe bracket and the second bracket to the second fastening portion and is inserted through the through hole;
The second fastening portion is fitted into the fitting groove,
A first bolt insertion hole through which the first bolt is inserted is formed elongated in the front-rear direction in the first fastening portion,
The pipe mounting structure is provided, wherein the through hole is formed to have a diameter larger than that of the second bolt.

Preferably, the anti-rotation portion is configured by a pin, and the first bracket is formed with a locking portion for locking the pin.

Preferably, the locking portion is formed in a slit shape.

Preferably, the first bolt is a stud bolt provided on the transmission, a nut for fastening the first bracket to the fixing system is screwed on the first bolt, and the pin is , the second bolt may be formed to reach an extension line of the nut when the second bolt is fully tightened to the first bracket.

Preferably, the fixed system comprises a transmission.

According to the above aspect, the pipe can be attached to the stationary system by absorbing positional deviation.

1 is a schematic top view of an exhaust pipe around a transmission to which a pipe mounting structure according to an embodiment of the present disclosure is applied; FIG. It is the perspective view which looked the pipe attachment structure from diagonally upward. FIG. 4 is a perspective view of a state in which the first bracket is attached to the exhaust pipe and the transmission; FIG. 4 is a side view of a state in which the first bracket is positioned on the exhaust pipe and the transmission; FIG. 4 is a perspective view of a state in which the first bracket is fastened to the exhaust pipe using the second bracket; It is a side view of the fully tightened second bracket.

Embodiments of the present disclosure will be described below with reference to the accompanying drawings. In the embodiments described later, the upstream side of the extending direction of the pipe is the front side, and the downstream side is the rear side. However, in the present embodiment, the extending direction of the pipe coincides with the front-rear direction of the vehicle. For this reason, the directions in this embodiment, which will be described later, are the same as the directions of the vehicle.

FIG. 1 is a schematic top view of an exhaust pipe 1 around a transmission T/M of a vehicle to which the pipe mounting structure according to the first embodiment of the present disclosure is applied, viewed from above.

As shown in FIG. 1, the pipe to which the pipe mounting structure is applied is a pipe (so-called A pipe) 2 forming part of an exhaust pipe 1 through which exhaust gas from an engine (internal combustion engine) E flows.

The engine E is a multi-cylinder compression ignition internal combustion engine mounted on a vehicle, that is, a diesel engine. A transmission T/M is connected to the rear of the engine E.

Further, the turbine 4 of the supercharger 3 is flange-connected in the left-right direction to the exhaust manifold of the engine E (not shown). A filter (hereinafter referred to as DPD) 5 for collecting particulate matter (PM) in the exhaust gas is flange-connected to the turbine 4 in the front-rear direction. The pipe 2 is flange-connected to the DPD 5 in the front-rear direction and in the downwardly inclined direction. Therefore, from the engine E to the pipe 2, flange connections are made at a plurality of locations and flange connections are made in various directions. Therefore, the position of the pipe 2 with respect to the engine E and the transmission T/M may be three-dimensionally deviated due to the accumulated mounting error exceeding the mounting tolerance between the units.

The pipe 2 extends rearward of the vehicle from the DPD 5 along the right side surface of the transmission T/M. As shown in FIG. 2, the pipe 2 has a front horizontal portion 2a connected to the DPD 5 and extending substantially horizontally and rearward, and an inclined portion 2b bent from the front horizontal portion 2a and extending obliquely downward and rearward. and a rear horizontal portion 2c bent from the inclined portion 2b and extending generally horizontally and rearward.

The pipe 2 is attached to the transmission T/M, which is a fixed system, by the pipe attachment structure according to the present disclosure.

As shown in FIGS. 2 and 5, the pipe mounting structure includes a pipe bracket 6 extending upwardly from the pipe 2, a through hole 7 formed through the pipe bracket 6 in the front-rear direction, and the pipe 2 and a first bracket 9. The first bracket 9 includes a first fastening portion 9 a arranged along the right side surface of the transmission T/M and a second fastening portion 9 b arranged along the front surface of the pipe bracket 6 . The pipe mounting structure includes a second bracket 10 arranged along the rear surface of the pipe bracket 6, a detent portion 11 provided on the second bracket 10, and a first fastening of the first bracket 9 to the transmission T/M. A first bolt 12 for fastening the portion 9a and a second bolt 13 for fastening the pipe bracket 6 and the second bracket 10 to the second fastening portion 9b are provided.

The pipe bracket 6 is formed on the inclined portion 2b of the pipe 2 so as to extend substantially vertically upward. A front surface of the pipe bracket 6 is formed with a first fastening surface 6 a that contacts the second fastening portion 9 b of the first bracket 9 . A rear surface of the pipe bracket 6 is formed with a second fastening surface 6 b that contacts the front surface of the second bracket 10 .

The through hole 7 is formed with a diameter larger than that of the second bolt 13 . As a result, even if the position of the pipe bracket 6 relative to the transmission T/M is slightly displaced in the vertical and horizontal directions, the pipe bracket 6 can be attached to the first bracket 9 and the second bracket 10 by inserting the second bolt 13 through the through hole 7 . can be concluded.

The fitting groove 8 is formed along the first fastening surface 6 a of the pipe bracket 6 . Specifically, the fitting groove 8 is formed in a padding 15 applied to the pipe 2 facing the first fastening surface 6a, and extends linearly in the left-right direction. A groove bottom 8a of the fitting groove 8 is formed flat.

The first bracket 9 is formed in a substantially L shape in plan view. The first fastening portion 9a extends in the front-rear direction and is attached to the transmission T/M. The second fastening portion 9b extends in the left-right direction. Also, the lower end of the second fastening portion 9b is fitted into the fitting groove 8 .

As shown in FIG. 4 , a notch 14 is formed in the first fastening portion 9 a so as not to interfere with the padding 15 . The notch 14 is formed by notching the lower end of the first fastening portion 9a. Accordingly, the second fastening portion 9b is formed longer downward than the first fastening portion 9a. When the lower end of the second fastening portion 9b is fitted into the fitting groove 8, the first fastening portion 9a is positioned above the build-up 15. As shown in FIG.

A first bolt insertion hole 16 for inserting the first bolt 12 is formed in the first fastening portion 9a. The first bolt insertion hole 16 is formed in an elongated shape elongated in the front-rear direction. As a result, even if the positions of the pipe bracket 6 and the first bracket 9 relative to the transmission T/M are slightly deviated in the longitudinal direction, the first bolt 12 can be inserted through the first bolt insertion hole 16 and the transmission T/M (Fig. 1), the first bracket 9 can be fastened.

As shown in FIGS. 3 and 4, a fixing nut 17 to be screwed with the second bolt 13 is provided integrally with the second fastening portion 9b. The fixing nut 17 is fixed to the front surface of the second fastening portion 9b (the surface opposite to the pipe bracket 6). Further, an insertion hole 18 for inserting the second bolt 13 into the fixing nut 17 is formed in the second fastening portion 9b. The inner diameter of the insertion hole 18 is set to approximately the same dimension as the outer diameter of the second bolt 13 (see FIG. 5).

As shown in FIGS. 2 and 5, the second bracket 10 is shaped like a flat plate elongated in the vertical direction. Further, an insertion hole 19 for inserting the second bolt 13 is formed in the second bracket 10 . A through hole 19 is formed in the lower portion of the second bracket 10 . The inner diameter of the insertion hole 19 is set to approximately the same dimension as the outer diameter of the second bolt 13 .

The anti-rotation portion 11 is composed of a pin 20 . The pin 20 is provided on the upper portion of the second bracket 10 so as to extend forward. The pin 20 is positioned above the pipe bracket 6 when the second bracket 10 is fastened to the first bracket 9 and the pipe bracket 6 . A locking portion 21 for locking the pin 20 is formed in the second fastening portion 9 b of the first bracket 9 . The locking portion 21 is formed in a slit shape extending downward from the upper end of the second fastening portion 9b. The pin 20 is restricted from moving in the circumferential direction around the second bolt 13 by being inserted into the slit-shaped locking portion 21 . Further, when the second bracket 10 is completely fastened (finally tightened) to the first bracket 9 and the pipe bracket 6, the pin 20 reaches the extension line of the nut 22 screwed onto the first bolt 12 (Fig. 6) is formed as follows. Thereby, the mounting order of the first bracket 9 and the second bracket 10 can be regulated. The nut 22 has a washer portion 22a, but may not have the washer 22a.

Specifically, it is assumed that the pipe 2 is attached to the transmission T/M using a box wrench (not shown). The pipe bracket 6 and the second bracket 10 cannot be fully fastened to the first bracket 9 until after the first bracket 9 is fully fastened to the transmission T/M. Even if an attempt is made to fully tighten the first bolt 12 after the pipe bracket 6 and the second bracket 10 are fully tightened to the first bracket 9, the pin 20 prevents the entry of the box wrench, and the first bolt 12 cannot be fully tightened. Can not. This is expected to ensure that the predetermined correct mounting order is followed.

The first bolt 12 is a stud bolt provided in advance on the transmission T/M. Fastening of the first bracket 9 to the transmission T/M is performed by screwing a nut 22 onto the first bolt 12 and tightening the first bracket 9 with the nut 22 . Note that the first bolt 12 is not limited to a stud bolt. For example, a screw hole functioning as a nut may be formed in the transmission T/M, and the first bolt 12 may be a normal bolt screwed into this screw hole. However, if the screw hole is deformed or the like, the transmission T/M will be damaged. Therefore, the transmission T/M is preferably provided with stud bolts. Even if the stud bolt is deformed, the transmission T/M will not be damaged and can be easily repaired by replacing the stud bolt.

Next, the operation of this embodiment will be described.

When attaching the pipe 2 connected to the engine E via the turbine 4 and the DPD 5 to the transmission T/M, first, as shown in FIGS. 8. As a result, the second fastening portion 9b is brought into close contact with the pipe bracket 6 and positioned accurately with respect to the pipe bracket 6 in the front-rear direction. After that, the first bracket 9 is pushed leftward and slid to be brought into close contact with the transmission T/M. At this time, the first bolt insertion hole 16 is formed in an elongated hole shape elongated in the front-rear direction. Therefore, the first bolt 12 can be inserted through the first bolt insertion hole 16 even when the position of the pipe 2 relative to the transmission T/M is deviated in the longitudinal direction. Further, even if the pipe 2 is vertically displaced with respect to the transmission T/M, the position of the first bracket 9 can be adjusted by sliding the first bracket 9 vertically within the fitting groove 8 .

Thereafter, as shown in FIG. 5, the nut 22 is screwed onto the first bolt 12 to temporarily tighten the first bracket 9 to the transmission T/M. After that, the second bracket 10 is overlaid on the rear surface of the pipe bracket 6 , and the pipe bracket 6 and the second bracket 10 are temporarily fastened to the first bracket 9 with the second bolts 13 .

At this time, the pipe bracket 6 is sandwiched between the second bracket 10 and the first bracket 9 in a state in which the pin 20 is inserted into the locking portion 21 and the insertion hole 19 is coaxially aligned with the insertion hole 18 . Then, in this state, the second bolt 13 is sequentially inserted into the insertion hole 19 , the through hole 7 , the insertion hole 18 and the screw hole of the fixing nut 17 . The through hole 7 of the pipe bracket 6 is formed with a diameter larger than that of the second bolt 13 . Therefore, even if the position of the pipe 2 is displaced in the vertical direction and the lateral direction with respect to the transmission T/M, the second bolt 13 can be inserted through the through-hole 7, and the displacement in the vertical and lateral directions can be prevented. can be absorbed.

Furthermore, the pin 20 abuts on the bottom of the slit-shaped locking portion 21 by being inserted into the locking portion 21 . By rotating the second bracket 10 around the pin 20 in this state, the insertion hole 19 of the second bracket 10 can be positioned coaxially with the insertion hole 18 of the first bracket 9 . Thereby, the fastening work of the second bolt 13 can be easily performed. Further, the engagement between the pin 20 and the locking portion 21 restricts the rotation of the second bracket 10 around the axis of the second bolt 13, and after the mounting, the second bracket 10 rotates due to vibration or the like, and the second bolt It is possible to prevent or reduce the spontaneous loosening of the joint 13 as it rotates.

Next, the nut 22 is finally tightened, and then the second bolt 13 is finally tightened. At this time, the second bolt 13 is retracted in advance to a position not on the extension line of the nut 22, and the nut 22 is fully tightened.

As shown in FIG. 6, if the second bolt 13 were to be fully tightened first, the pin 20 would reach the extension of the nut 22, preventing the full tightening of the nut 22 with the box wrench. Therefore, the second bolt 13 cannot be fully tightened until the nut 22 is fully tightened. Thereby, the operator can be urged to attach the first bracket 9 and the second bracket 10 in the correct attachment order.

Although the embodiments of the present disclosure have been described above in detail, the present disclosure is also capable of other embodiments as follows.

(1) Although the first bracket 9 is positioned in front of the pipe bracket 6 and the second bracket 10 is positioned behind the pipe bracket 6, the positions of the first bracket 9 and the second bracket 10 are reversed. may be In this case, the fitting groove 8 should be formed along the rear surface of the pipe bracket 6 .

(2) Although the latching|locking part 21 was demonstrated as what was formed in slit shape, it does not restrict to this. For example, the locking portion 21 may be a through hole penetrating in the front-rear direction, or a bottomed recess into which a shorter pin 20 is fitted and inserted.

(3) Although the anti-rotation portion 11 is configured by the pin 20 and the locking portion 21 is formed in a slit shape, the present invention is not limited to this. For example, the engaging portion 21 may be formed in the shape of a pin, and the anti-rotation portion 11 may be formed in the shape of a slit. In this case, the anti-rotation portion 11 may be a through hole penetrating in the front-rear direction, or a bottomed recess into which the pin-shaped locking portion 21 is fitted and inserted.

(4) Although the case where the pipe 2 is attached to the transmission T/M has been described, the pipe attachment structure according to the present disclosure may be applied to other pipes and stationary systems. Still further, the other pipes and fixing systems may be other pipes and fixing systems of the vehicle, or may be other pipes and fixing systems other than the vehicle.

The configurations of the respective embodiments described above can be partially or wholly combined as long as there is no contradiction. Embodiments of the present disclosure are not limited to the above-described embodiments, and include all modifications, applications, and equivalents encompassed by the concept of the present disclosure defined by the claims. Accordingly, the present disclosure should not be construed in a restrictive manner, and can be applied to any other technology that falls within the spirit of the present disclosure.

2 Pipe 6 Pipe bracket 6a First fastening surface 6b Second fastening surface 7 Through hole 8 Fitting groove 9 First bracket 9a First fastening portion 9b Second fastening portion 10 Second bracket 11 Anti-rotation portion 12 First bolt 13 2 bolts 16 1st bolt insertion hole T/M Transmission (fixed system)

Claims (5)

A pipe mounting structure for mounting a pipe extending in the front-rear direction to a fixing system that defines each direction of front, back, left, right, up and down,
a pipe bracket extending upwardly from the pipe and having front and rear fastening surfaces;
a through hole formed through the pipe bracket in the front-rear direction;
a fitting groove formed in the pipe along the fastening surface;
a first bracket having a first fastening portion extending in the front-rear direction and arranged along the fixing system, and having a second fastening portion extending in the left-right direction and arranged along the fastening surface; ,
a second bracket disposed along the fastening surface opposite to the fastening surface on which the second fastening portion is disposed;
a detent portion provided on the second bracket and engaged with the first bracket;
a first bolt that fastens the first fastening portion to the fixing system;
a second bolt that fastens the pipe bracket and the second bracket to the second fastening portion and is inserted through the through hole;
The second fastening portion is fitted into the fitting groove,
A first bolt insertion hole through which the first bolt is inserted is formed elongated in the front-rear direction in the first fastening portion,
The pipe mounting structure, wherein the through hole is formed to have a diameter larger than that of the threaded portion of the second bolt . The anti-rotation portion is composed of a pin,
The pipe mounting structure according to claim 1, wherein the first bracket is formed with a locking portion that locks the pin. The pipe mounting structure according to claim 2, wherein the locking portion is formed in a slit shape. The first bolt is a stud bolt provided in the fixing system,
A nut for fastening the first bracket to the fixing system is screwed onto the first bolt,
The pipe mounting structure according to claim 2 or 3, wherein the pin is formed to reach an extension line in the axial direction of the nut when the second bolt is fully tightened to the first bracket. The pipe mounting structure according to any one of Claims 1 to 4, wherein the fixed system comprises a transmission.

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