JP4090322B2 - Cooling water tube mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for a cooling water tube at the top of an engine. More specifically, the present invention relates to an improvement of a stay used for attaching such a cooling water tube.
[0002]
[Prior art]
Referring to FIG. 1 for explaining an embodiment of the present invention, mounting of a cooling water tube group P in the middle part on an engine for supplying a part of cooling water used for an engine cooling system to an intercooler, an oil cooler or the like. For example, there are used a plurality of stays having a shape in which, for example, three tubes 5a, 5b and 4 forming the tube group P are wound (embraced).
[0003]
The tube group P is formed of a metal tube due to heat resistance, required strength and rigidity at the mounting position, and is connected to the front and rear portions by a flexible tube made of rubber or the like. 1 and the like, and are integrated.
[0004]
The stay A cantileverly supports only the thin tubes 5a and 5b of the cooling water tube, and the stays B and C cantileverly support the thin tubes 5a and 5b and the thick tube 4 which is a water return tube. 5 cantilever-supports the tube capillaries 5a and 5b and the thick tube 4 in the form shown in FIG.
[0005]
In such a support of the tube group P, a plurality of stays supporting the thin tubes 5a, 5b and the thick tube 4 are provided with a stay that maximizes the load on the stay from the support and detachability. Stay 1 is the largest.
[0006]
In FIG. 5, the stay 1 </ b> A brazes and supports the narrow tubes 5 a and 5 b arranged in parallel in the vertical direction from the side, supports the thick tube 4 by brazing to the side, and bolts to the intake manifold Mi at the mounting portion 22. It is fixed.
[0007]
In this embodiment, the stay 1A is a cantilever made of a bent flat plate. For example, there is a concern that stress due to resonance of up / down, front / rear, and left / right vibrations applied by engine rotation vibration and running vibration may be applied to the brazed portion to cause separation. . If any of the tube groups P has peeling of the brazed portion, there is a concern of tube breakage, water leakage, engine overheat, engine damage.
[0008]
Due to the nature of the cantilever beam, there is a concern about the damage of the brazing part peeling or tube breakage as described above, and there is a concern about the base part of the stay and the place where the tube and the stay are fixed. The brazed and fixed part is a concern.
[0009]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above-described problems of the prior art, and is a stay having a shape in which three tubes are wound, and stress concentration is concentrated at a brazed portion where the stay is fixed to a water return tube of a thick tube. Therefore, it is an object of the present invention to provide a cooling water tube mounting structure that can prevent the stay from being damaged.
[0010]
[Means for Solving the Problems]
The cooling water tube mounting structure of the present invention fixes the long and short stays to the intake manifold (Mi) so that the short stay (3) is disposed below the long stay (2), The water return tube (4) is sandwiched between the two stays (3, 2), and the two cooling water tubes (5a, 5b) are supported by the longer stay (2). Item 1).
[0011]
According to the cooling water tube mounting structure of the present invention having such a configuration, among the three cooling water tubes arranged above the engine, the water return tube, which is the thickest tube, is formed by two long and short stays. It was made to pinch from both upper and lower sides. Therefore, the water return tube, which is a portion that bears the maximum weight of the three cooling water tubes, is sandwiched from both sides, and the water return tubes are supported at two locations. Therefore, the strength of the support portion of the water return tube is increased as compared with the case of the conventional single cantilever support.
[0012]
Compared to the prior art, only a short stay is added, so the overall shape of the tube group only needs to be taken into consideration, and the increase in weight and detachability to the engine are hardly a problem.
[0013]
In the cooling water tube mounting structure of the present invention, the longer stay (2) includes an intake manifold mounting portion (22), a rising portion (23), a curved portion (24), and an inverted U-shaped upper portion (26). The shorter stay (3) has an intake manifold mounting portion (32), a rising portion (33) and a curved portion (34), and the longer stay (2) and the shorter stay (3). The intake manifold mounting portion (22, 32) and the rising portion (23, 33) of the longer stay (3) have the same shape, and the curved portion of the longer stay (2) and the shorter stay (3) ( 24, 34) sandwiches the water return tube (4), and two cooling water tubes other than the water return tube (4) (26) by the inverted U-shaped portion (26) of the longer stay (2). 5a, 5b) Preferably it is lifting (claim 2).
[0014]
Here, the place where the water return tube (4) is supported by the two stays (2, 3) described above is the place where the weight of the three cooling water tubes (5a, 5b, 4) is most borne. It is preferable (Claim 3).
If comprised in that way, the attachment structure similar to the conventional stay can be employ | adopted about cooling water tubes other than a water return tube. Therefore, a significant layout change is not required for the conventional product.
[0015]
In carrying out the present invention, the length of the shorter stay (3) is such that when the shorter stay (3) is wound around the water return tube (4) and fixed (for example, brazed), The (brazing point) is set to a length necessary to maintain the necessary support strength (claim 4).
[0016]
Further, when implementing the present invention, it is preferable to consider the relative position with respect to the intake manifold so as to secure the shorter stay mounting space.
[0017]
Further, in the present invention, the two cooling water tubes (5a, 5b) other than the water return tube (4) are offset in the vertical direction from the water return tube (4), and the longer stay ( It is preferable to attach to 2) (Claim 5).
[0018]
Due to the offset, the shape of the longer stay is simplified, the assembly of the entire tube group is facilitated, and the dimensions for entraining the water return tube are increased, thereby increasing the support strength.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows the attachment position of the stay 1 of the cooling water tube which is the gist of the present invention, FIG. 2 shows an enlarged view of the stay 1, and FIG. 3 shows a cross section taken along line XX of FIG.
[0020]
In FIG. 1, two thin cooling water tubes 5 a and 5 b communicating with an engine cooling water supply section and a cooling required section and a thick water return tube 4 are connected to a tube group P by stays A, B, C, and 1. And is detachably attached to the engine by stays A, B, C, and 1.
[0021]
The tube group P is formed of a metal tube, and is communicated with a flexible tube made of a rubber material or the like at the front and rear, so that the stays A, B, C, and 1 are securely bolted to each part of the engine. Thus, the tube group P or the tubes 5a, 5b, and 4 are mounted so as not to individually vibrate due to engine vibration or vehicle running vibration.
[0022]
The stay 1 is a main part of the tube group P formed by the tubes 5a, 5b, and 4 attached to the engine, and is fixed to the intake manifold Mi that is an intake manifold with bolts.
[0023]
2 and 3, the stay 1 includes a longer stay 2 and a shorter stay 3, and the stay 2 and the stay 3 are formed in a deformed flat band shape by a plate material.
[0024]
The longer stay 2 is bolted to the intake manifold Mi and is formed of a straight flat mounting portion 22, a rising portion 23, a curved portion 24, and an inverted U-shaped portion 26.
[0025]
The attachment portion 22 is formed by being provided with an oval bolt hole 22a that overlaps with the attachment portion 32 of the shorter stay 3 described later and is fixed to the intake manifold Mi.
[0026]
The rising portion 23 is bent from the end 22c of the mounting portion 22 and is inclined in the rising direction in FIG. 3 and inclined in FIG. 2, and is formed in a straight line in the substantially vertical direction at the time of mounting. The tube 4 and the intake manifold Mi are formed in a length having a space arranged with a margin.
[0027]
The curved portion 24 is formed in an arc shape smoothly and continuously with the rising portion 23, and the inner diameter of the arc is formed in the same manner as the outer radius of the water return tube 4, and from the portion around which the water return tube 4 is wound. The straight portion 24a is linearly directed toward the inverted U-shaped portion 26.
The winding portion of the curved portion 24 that comes into contact with the water return tube 4 is welded and fastened by brazing.
[0028]
The inverted U-shaped portion 26 is formed in a straight line portion 24a of the curved portion 24, and an inverted U-shaped open portion having an end formed in an arc shape smoothly and continuously toward the right in FIG. Has been. Cooling water tubes 5a and 5b are supported at the bottom corresponding to the U-shaped long line portion 26a, and the contact portions are welded together by brazing.
[0029]
3, the shape of the longer stay 2 is simplified by supporting the cooling water tubes 5a and 5b at a distance from each other by offsetting the water return tube 4 upward in FIG. Yes. In addition, as for arrangement | positioning of the tubes 5a and 5b, if possible, an offset may be downward.
[0030]
FIG. 4 is a development view of the long stay 2 before press molding, showing a state in which the long stay 2 is bent from the end 22c and continues to the rising portion 23A, the curved portion 24A, and the inverted U-shaped portion 26A. .
[0031]
Returning to FIG. 3, the shorter stay 3 is formed by a straight flat mounting portion 32 that is bolted to the intake manifold Mi, a rising portion 33, and a curved portion 34, and the longer stay 2. It is fixed so that it may be placed on the underside.
[0032]
The attachment portion 22 is formed by providing an oval bolt hole 32a that overlaps with the attachment portion 22 of the longer stay 2 and is fixed to the intake manifold Mi.
[0033]
The rising portion 33 is bent from the end portion 32c of the mounting portion 32, is inclined in the rising direction in FIG. 3, is inclined in FIG. 2, and is linearly formed in a substantially vertical direction at the time of mounting.
[0034]
The curved portion 34 is formed in an arc shape in which the water return tube 4 is smoothly and continuously wound around the rising portion 33 via an arc-shaped curved portion 33c having a center on the left side in FIG. Is formed in the same manner as the outer radius of the water return tube 4.
[0035]
The winding portion of the curved portion 34 that comes into contact with the water return tube 4 is welded and fastened by brazing, and the winding length is set to a length necessary for holding the water return tube 4.
[0036]
Alternatively, the winding portion of the curved portion 34 that contacts the water return tube 4 has a length that allows the water return tube 4 to be supported only by the curved portion 34, and even if the support by the curved portion of the longer stay 2 is removed, Support of the water return tube 4 may be ensured.
[0037]
In the above, the attachment portion 22 of the longer stay 2 and the attachment portion 32 of the shorter stay 3 have the same shape, and the rising portion 23 of the longer stay 2 and the rising portion 33 of the shorter stay 3 are the same. The two ends of the same shape are welded together by brazing.
[0038]
As described above, the water return tube 4 is sandwiched between the curved portion 24 of the longer stay 2 and the curved portion 34 of the shorter stay 3, and both ends are fixed to the stay 2 by welding by brazing. .
[0039]
Then, by superposing the longer stay 2 and the shorter stay 3 and brazing welding, the strength of the end portions 22c and 32c of the rising portions 22 and 32 having particularly high stress is increased, thereby eliminating the fear of breakage. Further, with respect to the vibration applied to the stay 1 due to the increase of the natural frequency of the stay 1, resonance damage at low rotation such as idling can be prevented.
[0040]
The stay 1 constituted by the longer stay 2 and the shorter stay 3 is attached to a place that bears the most weight of the tube group P formed by the tubes 5a, 5b, 4 and the like. More than the weight of the stays A, B, and C is borne, and the efficiency of the weight burden by all the stays A, B, C, and 1 is improved.
[0041]
By such an arrangement of the stay 1 that bears weight, the arrangement positions of the stays A, B, and C can be easily set in terms of design and attachment / detachment productivity.
In addition, when the stay 1 is reinforced by the shorter stay 2 with the conventional one-piece structure, the other stays A, B, and C can be easily implemented.
[0042]
The cooling water tube mounting structure using the above stay 1 can be attached and detached in a narrow engine space, and can prevent the cooling water tube, particularly the water return tube and the stay 1 from being damaged.
[0043]
【The invention's effect】
The effects of the present invention are listed below.
(1) Since the heavy water return tube in the cooling water tube is sandwiched between and supported by two upper and lower stays, the stay and the water return tube are prevented from being damaged, and durability is guaranteed. .
(2) By increasing the natural frequency due to the two upper and lower stays, it is possible to increase the resonance damage strength particularly at a low engine speed.
(3) Since the intake manifold mounting part and the rising part of the above two upper and lower stays have the same shape, the mold can be shared and the cost can be reduced.
(4) Since the above-mentioned two upper and lower stays bear the position with the greatest weight burden, the other stays can be easily installed, and the design and productivity are easy.
(5) In the upper and lower two stays, the cooling water tube of the thin tube held by the longer stay is offset with respect to the water return tube of the thick tube, so that the shape of the stay can be simplified.
(6) If the water return tube holding length of the shorter one of the upper and lower stays is limited to a length that can guarantee the strength, useless weight and cost can be omitted.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a cooling water tube group showing a mounting position of a stay according to the present invention.
FIG. 2 is an enlarged view of the stay of the present invention in the configuration of FIG.
FIG. 3 is a view taken in the direction of arrows XX in FIG. 2;
FIG. 4 is a development view of the longer stay in FIGS.
FIG. 5 is a shape diagram of a conventional stay.
[Explanation of symbols]
A, B, C: Stay Mi ··· Intake manifold, intake manifold 1 · 2 stays 2 · Long stay 3 · Short stay 4 · Water return tube 5a 5b ··· Cooling water tubes 22 and 32 · · Intake manifold attachment portions 23 and 33 · · Standing portions 24 and 34 · · Curved portion 26 · · · U-shaped portion

Claims (5)

Fix the two long and short stays to the intake manifold so that the shorter stay is placed below the longer stay, sandwich the water return tube with the two stays, and the two stays with the two stays. A cooling water tube mounting structure characterized by being configured to support the cooling water tube. The longer stay has an intake manifold mounting portion, a rising portion, a curved portion, and an inverted U-shaped portion, and the shorter stay has an intake manifold mounting portion, a rising portion, and a curved portion. The intake manifold mounting portion and the rising portion of the longer stay and the shorter stay have the same shape, and the water return tube is sandwiched by the curved portion of the longer stay and the shorter stay. The cooling water tube mounting structure according to claim 1, wherein two cooling water tubes other than the water return tube are supported by the inverted U-shaped portion of the other stay. 3. The cooling water tube mounting structure according to claim 1, wherein the place where the water return tube is supported by the two stays is a place where the weight of the three cooling water tubes is most borne. The length of the shorter stay is set to a length necessary for maintaining the necessary supporting strength when the shorter stay is wound around the water return tube and fixed. The mounting structure of the cooling water tube of any one of 1-3. Two cooling water tubes other than the said water return tube are attached to the said long stay in the state offset up and down from the said water return tube, The cooling water tube of any one of Claims 1-4 Mounting structure.

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