JPH0534976Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an engine intake pipe structure.

(Prior art) Regarding the intake pipe structure of engines that has been adopted in the past, it is advantageous in terms of intake noise to make the intake pipe longer, which introduces intake air into the air cleaner installed in the engine. It is common practice to lengthen the length and place it above the radiator and across the radiator. For example, as described in Japanese Utility Model Application Publication No. 59-88263, it is known that an intake duct is arranged along the upper side of the radiator, and a resonator is arranged between it and the upper fan cowling as a noise reduction measure. There is.

However, in the above structure, since the intake duct passes above the fan cowling and the resonator, the number of peripheral parts such as the radiator fan increases, resulting in poor maintenance workability and serviceability.

Therefore, as shown in Japanese Utility Model Application Publication No. 60-7224, the intake duct is curved along the opening edge of the fan cowling, thereby extending the intake duct and reducing the number of parts. In addition to reducing intake noise while increasing air flow, there is also a system in which the curved portion of the intake duct also serves as a part of the fan cowling.

(Problems to be Solved by the Invention) However, with the configuration shown in the above publication, there is still room for improvement in terms of workability during engine assembly. In other words, in the configuration shown in this publication, the engine is installed in the engine room and the curved part of the intake duct is fastened to the upper end of the fan cowling with screws. Because the duct is placed in contact with the edge of the flange of the fan cowling, the supporting state of the intake duct is unstable when screwing, and the intake duct shifts in the vehicle width direction. In such a case, it becomes impossible to perform the fastening work. Therefore, in the configuration of this publication, it was necessary to prevent the movement of the intake duct by some means. In addition, in the configuration of this publication, the upper end of the curved part of the intake duct is only fastened to the upper end of the cowling, and the support rigidity of the horizontal part of the duct that is disposed on both sides of the curved part and extends in the horizontal direction is limited. It would be difficult to say that they were sufficiently secured. In other words, in order to ensure a large amount of support rigidity for the intake duct as a whole, it is preferable that the cowling supports both sides of the upstream end portion and the downstream portion of the intake duct, that is, both horizontal portions of the duct. However, it is difficult to meet this demand with the configuration disclosed in the above publication.

The present invention has been devised in view of these points, and is designed to improve workability when assembling the intake duct to the fan cowling, compared to an intake pipe structure in which the intake duct is also used as a part of the cowling. It is an object of the present invention to obtain a configuration that can improve the air intake duct and ensure support rigidity of the intake duct.

(Means for Solving the Problems) In order to achieve the above object, the present invention forms a connecting flange portion facing the horizontal portion of the intake duct on the lower cowling of the upper and lower split type cowling. The horizontal part of the intake duct is fastened to the connecting flange part. Specifically, an intake duct that introduces intake air into an air cleaner installed in the engine is arranged across the radiator on the back side of the radiator, and upper and lower air intake ducts are attached to the back side of the radiator and have an opening for outside air circulation. A curved edge forming the lower part of the opening in the lower cowling of the split type cowling is bent toward the rear of the vehicle body to form an intermediate flange portion that guides outside air, and a curved edge is formed in the middle of the intake duct. and arranged along a curved edge forming an upper portion of the opening in the upper cowling so that the curved portion forms a flange portion for guiding outside air together with an intermediate flange portion of the lower cowling. It is assumed that the intake pipe structure of the engine is similar to that of the previous model. Connecting flange portions extending horizontally outward are connected to both left and right ends of the intermediate flange portion of the lower cowling, and the connecting flange portions include:
Form a bolt hole that penetrates in the vertical direction. Further, the intake duct is provided with a horizontal portion that is connected to both left and right ends of the curved portion and extends horizontally outward above the connecting flange portion, and a bolt of the connecting flange portion is provided on a lower surface of the horizontal portion. A stud bolt extending downward is provided at a position corresponding to the hole, and with the stud bolt inserted into the bolt hole from above to below, the intake duct is closed by tightening the nut from below the connecting flange. It is configured to be fastened to the lower cowling.

(Function) With the above configuration, in the present invention, when an engine to which an intake duct is connected is installed in an engine room, the engine is lowered from above the engine room and housed in the engine room. On this occasion,
A stud bolt disposed on the lower surface of the horizontal portion of the intake duct is inserted into a bolt hole formed in the connecting flange portion of the lower cowling. When the stud bolt is inserted into the bolt hole in this manner, the horizontal movement of the intake duct is restricted, that is, the intake duct is temporarily supported by the cowling. In this state, the intake duct is firmly fastened to the cowling by screwing the nut onto the stud bolt from below the engine room. When the intake duct is connected to the cowling in this way, the intake duct is supported by the cowling at a position near the outer end of the radiator in the vehicle width direction.
This means that the supporting rigidity of the intake duct is significantly improved compared to a case where the intake duct is supported at the center in the vehicle width direction.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In the engine intake pipe structure shown in FIGS. 1 to 3, reference numeral 1 denotes an intake duct that introduces intake air into an air cleaner 8 installed in an engine 9, and is an intake duct that extends across the radiator 6 on the back side of the radiator 6. It is located. Also, 2 is the radiator 6
This cowling has an opening 2a for outside air circulation, which is attached to the back surface of the radiator fan 3 and faces the radiator fan 3. This cowling 2 is of a vertically split type, and is divided into upper and lower parts at approximately the center in the vertical direction of the cowling 2, and is divided into an upper cowling 4 and a lower cowling 5.
It is becoming popular.

The upper cowling 4 is formed with a curved edge that is curved upward around the center portion of the lower end edge in the vehicle width direction so as to form the upper portion of the opening 2a. On the other hand, the lower cowling 5
is formed by a curved edge 5e whose upper end edge is curved downward around the center in the vehicle width direction so as to form the lower part of the opening 2a. The curved portion 5e of the lower cowling 5
An intermediate flange portion 5a that is bent toward the rear of the vehicle body and guides outside air is integrally formed therein. Further, a box-shaped portion 4 is provided at the outer edge portion of each of the cowlings 4 and 5.
a and 5d are formed to guide outside air that has passed through the radiator 6 toward the fan 3. Connecting flange portions 5b and 5c are integrally formed on the upper edge of the lower cowling 5, excluding the intermediate flange portion 5a, and are bent toward the rear of the vehicle body. In other words, this connecting flange portion 5
b and 5c are connected to both left and right ends of the intermediate flange portion 5a, respectively, and are formed to extend outward in the horizontal direction. Furthermore, each connecting flange portion 5
Two bolt holes (not shown) are formed in each of b and 5c to penetrate in the vertical direction.

A curved portion 1a is formed in the middle of the intake duct 1, and is curved in the same manner as the curved edge of the upper cowling 4.
a is arranged along the curved edge of the upper cowling 4. Thereby, the curved portion 1a of the intake duct 1 performs the same function as the intermediate flange portion 5a formed on the lower cowling 5, and guides outside air. In other words, the curved portion 1a of the intake duct 1 also serves as a part of the cowling 2.

The intake duct 1 includes the curved portion 1.
Horizontal portions 1d and 1e are connected to the left and right ends of a, respectively. The horizontal portions 1d and 1e are arranged along the lower edge of the upper cowling 4 excluding the curved edge, and extend outward in the horizontal direction above the connecting flange portions 5b and 5c of the lower cowling 5. Further, stud bolts 11, 11, . . . extending downward from the lower surface of each horizontal portion 1d, 1e are arranged at positions corresponding to the bolt holes formed in the connecting flange portions 5b, 5c. has been done. And this stud bolt 1
1 is inserted into the bolt hole from above to below, and in this state, the nut 12 is screwed onto the stud bolt 11 from below the connection flange portions 5b, 5c, and the horizontal portions 1d, 1e of the intake duct 1 are screwed together. They are fastened to connecting flanges 5b and 5c of the lower cowling 5, respectively.

Incidentally, an intake opening 1b serving as an outside air intake port is opened toward the front of the vehicle body at the tip portion 1c of the intake duct 1 on the upstream side of the intake air flow. Further, the intake air circulation downstream side of the intake duct 1 is connected to the engine 9 through a silencer 7, an air cleaner 8, and an outside air manifold 10. Further, reference numeral 13 is a hot hose that returns the coolant whose temperature has risen after cooling the engine 9 to the radiator 6.

Next, the installation work of the engine 9 and the intake duct 1 into the engine room will be explained. First of all,
A radiator 6 with upper and lower cowlings 4 and 5 integrally assembled is placed at the front end in the engine room.In this state, the engine 9 to which the intake duct 1 is connected is placed in the engine room. It is lowered from above, accommodated in the engine room, and installed at a predetermined position. At this time, as the intake duct 1 descends as the engine 9 descends, the stud bolts 11, 11, . It will be inserted into bolt holes formed in the flange portions 5b and 5c. When the stud bolt 11 is inserted into the bolt hole in this manner, the movement of the intake duct 1 in the horizontal direction is restricted, that is, the intake duct 1 is temporarily supported by the cowling 2. There is. In this state, the intake duct 1 is firmly fastened to the cowling 2 by screwing the nuts 12, 12, . . . onto the stud bolts 11, 11, . Also, at the same time as this operation, the engine 9
will also be fastened to the engine mount in the engine room. Therefore, in the state where the intake duct 1 is fastened to the cowling 2 in this way, the intake duct 1 is supported by the cowling 2 at a position near the outer end of the radiator 6 in the vehicle width direction, so that the intake duct 1 is supported by the cowling 2 at a position near the outer end of the radiator 6 in the vehicle width direction This means that the supporting rigidity of the intake duct 1 is significantly improved compared to a case where the intake duct 1 is supported at the same portion.

As described above, according to the configuration of this example, when assembling the intake duct 1 to the cowling 2, the intake duct 1 can be assembled by tightening nuts from the underside of the vehicle body while the intake duct 1 is temporarily supported. The workability is greatly improved, and the support rigidity in the state where the intake duct 1 is supported by the cowling 2 can be greatly improved.

(Effects of the invention) As explained above, according to the engine intake pipe structure of the invention, connecting flange parts extending horizontally outward are connected to both left and right ends of the intermediate flange part of the lower cowling. , the connecting flange portion is formed with a bolt hole penetrating in the vertical direction, and the front intake duct is provided with a horizontal portion connected to both left and right ends of the curved portion and extending horizontally outward in the upper side of the connecting flange portion. and a stud bolt extending downward is provided on the lower surface of the horizontal portion at a position corresponding to the bolt hole of the connecting flange portion,
Since the intake duct is fastened to the lower cowling by tightening the nut from below the connecting flange portion with the stud bolt inserted into the bolt hole from above to below, the intake duct is not attached to the cowling. When assembling, the stud bolt must be inserted into the bolt hole, so it can be done by temporarily supporting the intake duct and tightening the nuts from the underside of the vehicle, which improves work efficiency. Significant improvements can be made. Also,
When the intake duct is supported by the cowling,
Since the intake duct is supported by the cowling at a position near the outer end of the radiator in the vehicle width direction, the support rigidity of the intake duct can be significantly improved compared to a case where the intake duct is supported at the center in the vehicle width direction. can.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part showing the intake pipe structure of an engine according to the present invention, FIG. 2 is a plan view showing the intake pipe structure of an engine, and FIG. 3 is a side view of a main part of the intake pipe structure of an engine. 1... Intake duct, 1a... Curved part, 1d, 1
e...Horizontal part, 2...Cowling, 2a...Opening, 4...Upper cowling, 5...Lower cowling, 5a...Intermediate flange part, 5b, 5c...Connection flange part, 5e...Curved Part, 6...Radiator, 8...Air cleaner, 9...Engine, 11
... Studbolt, 12...Natsuto.

Claims (1)

[Claims for Utility Model Registration] An intake duct for introducing intake air into an air cleaner installed in the engine is arranged on the back side of the radiator across the radiator, and an opening is attached to the back side of the radiator for outside air circulation. An intermediate flange portion that is bent toward the rear of the vehicle body and guides outside air is formed on the curved edge forming the lower part of the opening in the lower cowling of the upper and lower split type cowling, and the intake duct A curved portion is formed in the middle, and the curved portion forms an upper portion of the opening in the upper cowling so as to serve as a flange portion that guides outside air together with the intermediate flange portion of the lower cowling. In an engine intake pipe structure arranged along a curved edge, connecting flange portions extending horizontally outward are connected to both left and right ends of the intermediate flange portion of the lower cowling, and the connecting flange portions are connected to the connecting flange portions. is formed with a bolt hole penetrating in the vertical direction, and the intake duct includes a horizontal part that is connected to both left and right ends of the curved part and extends horizontally outward above the connecting flange part, A stud bolt extending downward is disposed on the lower surface of the horizontal portion at a position corresponding to the bolt hole of the connection flange portion, and when the stud bolt is inserted into the bolt hole from above to below, the connection is completed. An engine intake pipe structure characterized in that an intake duct is fastened to a lower cowling by tightening a nut from below the flange part.