JP2007163015A - Mounting structure of heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a heat exchanger for reducing thermal stresses that are generated on a bracket part and a heat exchanger body when a thermal expansion difference occurs between the heat exchanger body and the side to which it is mounted. <P>SOLUTION: In the mounting structure of the heat exchanger, the bracket part 110 is provided with a bolt hole 111 formed in the shape of an oblong hole along the longitudinal direction of the heat exchanger body 2. A stepped bolt 150 is passed through the bolt hole 111, a compressed telescopic member 120 is interposed between the head 150a of the stepped bolt and the bracket part 110, and the stepped bolt 150 is tightly secured to the side 200 to which the body is mounted. When thermal expansion of the heat exchanger body 2 in the longitudinal direction relative to the side 200 occurs as the result of a thermal expansion difference between the heat exchanger body 2 and the side 200, the bracket part 100 can move relative to the bolt 150. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger mounting structure in which a heat exchanger in which a bracket portion is integrally formed with a heat exchanger main body is attached to the mounted side via the bracket portion, and more particularly, the heat exchanger main body and the mounted side. It is related with the attachment structure of the heat exchanger for relieving the thermal stress which arises in a bracket part when a thermal expansion difference arises between.

  In recent years, in order to attach a heat exchanger body (for example, an EGR cooler) to a mounted side (for example, an exo manifold or an intake intake manifold), as shown in FIGS. A heat exchanger 100 in which 10 is integrally formed at both longitudinal ends of the heat exchanger body 2 has been developed. In the heat exchanger 100 shown in the drawing, a pair of bracket portions 3, 30, cone portions 4, 40 and pipes 6, 60 are provided at both ends in the longitudinal direction of the heat exchanger body 2, and the bracket portion 1 described above is provided. , 10 are provided in the cone portions 4 and 40. A high-temperature fluid (for example, EGR gas) and a low-temperature fluid (for example, engine coolant) are supplied into the heat exchanger body 2 through the cone portions 4, 40 and the pipes 6, 60, respectively. Heat exchange is performed with each other via the plate 7 of the core portion in the main body 2.

The heat exchanger 100 is structured to be attached to the attached side 200 via the bracket portions 1 and 10, and specifically, bolts 5 and 50 are inserted into the bolt holes 11 provided in the bracket portions 1 and 10. The bolts 5 and 50 are fastened and fixed to the attached side 200, and the head portions 5a and 50a of the bolts 5 and 50 are fastened to the bracket portions 1 and 10, respectively. Is attached to the attached side 200 (see, for example, Patent Document 1). Thus, the heat exchanger 100 in which the bracket portions 1 and 10 and the heat exchanger body 2 are integrally formed is attached to the attached side 200 via the bracket portions 1 and 10.
JP 2002-285117 A

  However, the conventional techniques as described above have the following problems. That is, in the conventional heat exchanger mounting structure, the shape of the bolt hole 11 provided in the bracket portions 1 and 10 is substantially the same as the shape of the bolts 5 and 50, and 10 is strongly tightened to the mounted side 200 by the heads 5a and 50a of the bolts 5 and 50, and both are completely fixed to the mounted side 200. Therefore, none of the bracket portions 1 and 10 can move relative to the bolts 5 and 50, and a difference in thermal expansion occurs between the heat exchanger main body 2 and the attached side 200, and the heat exchanger main body 2. Is thermally expanded in the longitudinal direction with respect to the mounted side 200, excessive thermal stress is generated in the bracket portions 1 and 10 and the heat exchanger body 2 (for example, the bracket portion 1 in FIG. 3B). 10).

  For example, when the EGR cooler 100 in which the bracket portions 1 and 10 are integrally formed is attached to the intake intake manifold 200 made of cast aluminum, the amount of thermal expansion of the intake intake manifold 200 during engine operation is Although it is very small under the control of the relatively low intake air temperature, since the relatively high temperature EGR gas flows through the heat exchanger body 2 of the EGR cooler 100, the thermal expansion amount is excessive, and the latter thermal expansion amount is the former. May reach about 2 to 5 times. As a result, a large difference in thermal expansion occurs between the heat exchanger body 2 and the intake intake manifold 200, and the heat exchanger body 2 is in the longitudinal direction with respect to the intake intake manifold 200 (in the case of FIG. 3A). Expands in both directions. At that time, in the conventional heat exchanger mounting structure, as described above, since the bracket portions 1 and 10 are all fixed to the intake intake manifold 200 on the mounting side, the bolt 5 , 50 cannot be moved relative to each other. Therefore, excessive thermal stress is generated in the bracket portions 1 and 10 and the heat exchanger main body 2 (for example, the plate 7 in FIG. 3C) integrally formed therewith, and crack damage or the like may occur. It was.

  This invention is for solving said subject, The objective arises in a bracket part and a heat exchanger main body, when a thermal expansion difference arises between a heat exchanger main body and a to-be-attached side. An object of the present invention is to provide a heat exchanger mounting structure for relieving thermal stress.

  In order to solve the above problems, the present invention is a heat exchanger mounting structure in which a heat exchanger in which a bracket portion is integrally formed with a heat exchanger body is attached to a mounted side via the bracket portion, The bracket portion is provided with a bolt hole formed in a long hole shape with respect to the longitudinal direction of the heat exchanger body, and a bolt is inserted into the bolt hole so that a gap between the bolt head and the bracket portion is provided. The bolt is fastened and fixed to the attached side with a compressed elastic member interposed therebetween, and a difference in thermal expansion occurs between the heat exchanger body and the attached side, so that the heat exchanger body is attached to the attached side. When the thermal expansion is performed in the longitudinal direction with respect to the mounting side, the bracket portion is configured to be relatively movable with respect to the bolt.

  According to such a configuration, since the bolt hole is formed in the shape of a long hole, if a difference in thermal expansion occurs between the heat exchanger main body and the mounted side, the bracket portion is accompanied by the same direction as the thermal expansion. Move to slide. By the sliding movement of the bracket portion, the thermal stress generated in the bracket portion and the heat exchanger body is dispersed or absorbed, and the thermal stress can be relaxed. If the bolt is tightened and fixed with the bolt head in contact with the bracket just by forming the bolt hole into a long hole, it will be difficult to make fine adjustments to the pressing force of the bolt against the bracket. Therefore, it is not possible to achieve a good balance between maintaining the mounting strength of the heat exchanger and sliding the bracket portion. That is, if the bolt is firmly tightened and fixed with the bolt head in contact with the bracket portion, the pressing force against the bracket portion increases and the mounting strength of the heat exchanger is improved, while the resistance against the slide movement of the bracket portion is improved. Rises and smooth movement is hindered. Conversely, if the bolts are loosely tightened and fixed in this state, the resistance to the sliding movement of the bracket portion will be reduced and smooth movement will be possible, while the pressing force on the bracket portion will be reduced and the mounting strength of the heat exchanger will be reduced. Resulting in. However, as in the present invention, when the bolt hole is not only formed in the shape of a long hole, but also when an expansion / contraction member is interposed between the bolt head and the bracket portion, it is indirectly caused by the bias of the expansion / contraction member. The bracket portion is pressed, and the above-described pressing force can be finely adjusted as compared with the case where the bracket portion is directly pressed by the bolt head. As a result, it is possible to achieve both the mounting strength of the heat exchanger and the sliding movement of the bracket portion.

  In the present invention, the bolt is a stepped bolt, and the stepped bolt is fastened and fixed to the mounted side with the stepped portion of the stepped bolt in contact with the mounted side. It is good. Alternatively, the collar may be inserted into the bolt hole so that the collar is in contact with the attached side, and the bolt is inserted into the collar and the bolt is fastened and fixed to the attached side. .

  According to this configuration, the compression allowance of the expansion / contraction member is appropriately managed by the stepped bolt or the collar, and it is easy to maintain both the mounting strength of the heat exchanger and the sliding movement of the bracket portion. . Therefore, the thermal stress generated in the bracket portion and the heat exchanger body can be further alleviated by sliding the bracket portion while maintaining the state where the heat exchanger is attached to the attached side.

  According to the present invention, in the heat exchanger mounting structure in which the heat exchanger in which the bracket portion is integrally formed with the heat exchanger main body is attached to the mounted side via the bracket portion, the heat exchanger main body and the mounted side When a difference in thermal expansion occurs between them, the thermal stress generated in the bracket portion and the heat exchanger body can be relaxed.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1A and 1B are explanatory diagrams of the first embodiment of the present invention, and FIG. 2 is an explanatory diagram of the second embodiment of the present invention. In the figure, the same or similar parts as those in FIG. 3 are denoted by the same reference numerals, and changed parts and newly added parts are denoted by new reference numerals.

=== First Embodiment ===
1A and 1B are explanatory views showing a heat exchanger mounting structure according to the first embodiment of the present invention. FIG. 1A shows a state before thermal expansion, and FIG. 1B shows a state during thermal expansion.

  In the heat exchanger mounting structure shown in the figure, the heat exchanger 100 in which the bracket portions 10 and 110 are integrally formed with the heat exchanger main body 2 is attached to the attached side 200 via these bracket portions 10 and 110. It has a structure. The bracket portion 110 on the right side of the figure is provided with a bolt hole 111 formed in a long hole shape with respect to the longitudinal direction of the heat exchanger main body 2 (in the case of FIG. A stepped bolt 150 is inserted into the bolt hole 111, and the stepped bolt 150 is fastened and fixed to the attached side 200. Further, a compressed expansion / contraction member 120 is interposed between the head portion 150a of the stepped bolt 150 and the bracket portion 110, and the bracket portion 110 is urged or pressed against the attached side 200 by the expansion / contraction member 120. It is installed in the state. And when a thermal expansion difference arises between the heat exchanger main body 2 and the to-be-attached side 200, and the heat exchanger main body 2 thermally expands to a longitudinal direction with respect to the to-be-attached side 200, the bracket part 110 will become a stepped bolt. The relative movement with respect to 150 is possible.

  That is, by forming the bolt hole 111 in the shape of a long hole as described above, the heat exchanger main body 2 is thermally expanded in the longitudinal direction (the right direction in the case of the figure) with respect to the attached side 200. At this time, the bracket part 110 slides with respect to the stepped bolt 150 fastened and fixed to the attached part 200 (in the case of the same figure, it moves in the right direction). In addition, about the shape of a bolt hole 111, a magnitude | size, etc., it designs so that it may become the structure which provided the play between the bolt hole 111 and the front-end | tip part 150c.

  The stepped bolt 150 includes a head portion 150a, a column portion 150b, and a tip portion 150c, and a step portion is formed between the column portion 150b and the tip portion 150c. In the stepped bolt 150, the tip end side of the column portion 150 b is inserted into the bolt hole 111, and the stepped portion described above is in contact with the attached side 200.

  As the expansion / contraction member 120, a member that has previously grasped the characteristics of the contraction amount and the repulsive force is used. In addition, the degree of fastening weight of the stepped bolt 150 is to maintain the mounting strength of the heat exchanger 100 in consideration of the weight of the heat exchanger body 2 and the dynamic weight associated with the sliding movement of the bracket part 110, and the like. It manages so that the slide movement of the bracket part 110 may be compatible.

  According to the above configuration, when a difference in thermal expansion occurs between the heat exchanger body 2 and the attached side 200, the heat exchanger body 2 thermally expands in the longitudinal direction with respect to the attached side 200. In addition, the bracket part 110 slides with respect to the stepped bolt 150 fastened and fixed to the attached part 200.

  By such sliding movement of the bracket part 110, the thermal stress generated in the bracket part 110 is dispersed or absorbed, and the thermal stress generated in the bracket part 10 on the opposite side (left side in the drawing) is also dispersed or absorbed. . As a result, the thermal stress generated in both the bracket portions 10 and 110 is relieved, and accordingly, the thermal stress generated in the heat exchanger body 2 integrally formed with the bracket portions 10 and 110 is also relieved. The sliding movement of the bracket part 110 starts when the heat exchanger body 2 is thermally expanded to generate excessive thermal stress and the thermal stress exceeds the friction limit of the bracket part 110.

  By the way, in this embodiment, the expansion / contraction member 120 is interposed between the bolt head 150a and the bracket portion 110, and the bracket portion 110 is indirectly pressed against the attached side 200 by the urging force of the expansion / contraction member 120. It is composed. Therefore, compared with the case where the bolt head portion 150a is brought into contact with the bracket portion 110 and the bracket portion 110 is directly pressed by the bolt head portion 150a, the pressing force can be easily finely adjusted. It becomes possible to achieve both the holding of the attachment strength and the sliding movement of the bracket part 110. Moreover, since the compression margin of the expansion / contraction member 120 is appropriately managed by the stepped bolts 150, it is easy to achieve both.

  Moreover, in this embodiment, this invention is applied only to the bracket part 110 of the one end side among the bracket parts 10 and 110, and it has improved as mentioned above. However, it is preferable to apply the present invention to both the bracket portions 10 and 110 and improve as described above. In such a case, both the bracket portions 10 and 110 can move relative to the stepped bolt 150, and when the heat exchanger body 2 thermally expands in the longitudinal direction with respect to the attached side 200, the bracket portion 10 Slides in the left direction, while the bracket part 110 slides in the right direction. Accordingly, the thermal stress generated in the bracket portions 10 and 110 is dispersed or absorbed at both ends, and the thermal stress generated in the heat exchanger body 2 integrally formed with these is also dispersed or absorbed. Therefore, for example, when the heat exchanger body 2 is an EGR cooler and the attached side 200 is an intake intake manifold, that is, when a large thermal expansion difference occurs between the heat exchanger body 2 and the attached side 200. Even in such a case, the thermal stress generated in the bracket portions 10 and 110 and the heat exchanger body 2 can be further reduced, and specifically, the thermal stress can be reduced to about 50%. .

=== Second Embodiment ===
FIG. 2 is an explanatory view showing a heat exchanger mounting structure in the second embodiment of the present invention. The heat exchanger mounting structure shown in the figure is substantially the same as that of the first embodiment. However, in this embodiment, the collar 160 is inserted into the bolt hole 11 so that the collar 160 is in contact with the attached side 200, and the bolt 5 is inserted with the bolt 5 inserted into the collar 160. Fastened and fixed to the mounting side 200.

  According to the above configuration, the collar 160 has a function similar to that of the stepped bolt 150 shown in the first embodiment, whereby the compression allowance of the expansion / contraction member 120 is appropriately managed. Therefore, it becomes easy to maintain both the mounting strength of the heat exchanger 100 and the sliding movement of the bracket part 110. Therefore, the above-described thermal stress can be further alleviated by sliding the bracket portion 110 while maintaining the state where the heat exchanger 100 is attached to the attached side.

It is explanatory drawing which shows the attachment structure of the heat exchanger before thermal expansion in 1st embodiment of this invention, (a) is a side view, (b) is the attachment structure of the heat exchanger shown to (a) below. The figure seen from the side, (c) is the figure which looked at the attachment structure of the heat exchanger shown in (a) from the right side (however, including a partial sectional view). It is explanatory drawing which shows the attachment structure of the heat exchanger at the time of the thermal expansion in 1st embodiment of this invention, (a) is a side view, (b) is the attachment structure of the heat exchanger shown to (a) below. It is the figure seen from the side (however, including a partial sectional view). It is explanatory drawing which shows the attachment structure of the heat exchanger in 2nd embodiment of this invention. It is explanatory drawing which shows the attachment structure of the heat exchanger in a prior art, (a) is a side view, (b) is the figure which looked at the attachment structure of the heat exchanger shown to (a) from the lower side, (c) FIG. 4 is a view of the heat exchanger mounting structure shown in (a) as viewed from the right side (including a partial cross-sectional view).

Explanation of symbols

110 Bracket part 111 Bolt hole 120 Elastic member 150 Stepped bolt 160 Color

Claims (3)

A heat exchanger mounting structure in which a heat exchanger in which a bracket portion is integrally formed with a heat exchanger main body is attached to a mounted side via the bracket portion,
The bracket portion is provided with a bolt hole formed in a long hole shape with respect to the longitudinal direction of the heat exchanger body, and a bolt is inserted into the bolt hole so that a gap between the bolt head and the bracket portion is provided. The bolt is fastened and fixed to the attached side with a compressed elastic member interposed therebetween, and a difference in thermal expansion occurs between the heat exchanger body and the attached side, so that the heat exchanger body is attached to the attached side. The heat exchanger mounting structure, wherein the bracket portion is configured to be relatively movable with respect to the bolt when thermally expanding in the longitudinal direction with respect to the mounting side. In the heat exchanger mounting structure according to claim 1,
The bolt is a stepped bolt, and the stepped bolt is fastened and fixed to the mounted side with the stepped portion of the stepped bolt in contact with the mounted side. Mounting structure of the vessel. In the heat exchanger mounting structure according to claim 1,
The heat is characterized in that a collar is inserted into the bolt hole so that the collar is in contact with the mounted side, the bolt is inserted into the collar and the bolt is fastened and fixed to the mounted side. Exchanger mounting structure.

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