JP3452176B2 - Mounting structure of resin parts - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a mounting structure for a resin part, and more particularly, to a structure in which a strong fixed state is obtained at normal times and an impact force is applied. The present invention relates to a mounting structure of a resin part which can be easily detached at times. 2. Description of the Related Art A large number of resin parts are used in vehicles such as trucks. For example, an air cleaner or the like is mostly made of resin, and a resin air cleaner body constituting the air cleaner is attached to a chassis frame of a vehicle using bolts or the like. FIGS. 5 to 8 show an air cleaner mounting portion structure as an example of a resin component mounting portion structure. In a vehicle 1 such as a truck, a cab 4 serving as a driver's cab is generally mounted on a front portion of a chassis frame 3 on which an engine, wheels 2 and the like (not shown) are mounted, and a cab hinge portion is provided. 5 so that the cab 4 can pivot up and down, and the rear of the cab 4 is
Is mounted on a rear arch 6 formed so as to be able to lock and unlock a tilting operation centered on the cab hinge portion 5 via a lock mechanism (not shown). [0005] A cylindrical air cleaner body 7 is disposed on one side of the chassis frame 3 near the rear of the cab 4 with its axis oriented in the vehicle width direction 8. Band 9 and bolt 10
Air cleaner splash board 11 made of resin
The resin air-cleaning splash board 11 is mounted on a mounting base called a front bracket 12 erected diagonally upward from the chassis frame 3 and a rear arch 6.
And is firmly fixed to the chassis frame 3 with bolts 14 and 15 via a substantially L-shaped rear bracket 13 protruding forward and horizontally. In the drawing, reference numeral 16 denotes an air suction portion projecting upward from the air cleaner main body 7, and 17 is integrally attached to a rear portion of the cab 4, and is connected to the air suction portion 16 when the cab 4 is turned upside down. An intake pipe for disconnection is provided, 18 is an air discharge portion projecting laterally from the air cleaner main body 7 and connected to an engine (not shown), 19 is a cab floor, and 20 is a cab floor rather than the cab 4 in the chassis frame 3. It is a carrier provided in the rear part. The bolt 10 and the bolts 14, 15 used for fixing the air cleaner body 7 are shown in FIGS.
As shown in FIG.
It is a so-called buried bolt embedded in a resin part such as. [0008] Here, 21 is the head of the bolts 14, 15;
22 is a screw portion of the bolts 14 and 15, 23 is a bolt 14
15, a resin-embedded body portion having the same diameter as the screw portion 22 and embedded in a resin-made part such as the air-cleaning splash board 11, which is located between the head portion 21 and the screw portion 22.
Reference numeral 4 denotes a bolt surrounding portion of the air cleaner splash board 11. In the air cleaner body 7, the vibration of the engine (not shown) can be directly transmitted through the air discharge portion 18, and the vibration of the road surface can be directly transmitted through the chassis frame 3. It is necessary to prevent the air cleaner main body 7 from rattling easily. For this purpose, bolts 14 and bolts 14 are provided between the air cleaner splash board 11 and the front bracket 12 or the rear bracket 13.
By using 15 or the like, the air cleaner main body 7 is firmly fixed to suppress rattling. At this time, since the bolts 14 and 15 are so-called embedded bolts that are embedded in the resin-made air-cleaning splash board 11, the heads shown by phantom lines in FIGS. When a nut is screwed into the bolts 14 and 15, a slip occurs between the head 21 of the bolts 14 and 15 and the bolt surrounding portion 24 of the air-cleaning splash board 11, and the bolts are screwed. Since the nuts 14 and 15 co-rotate with the nuts, a strong tightening torque cannot be secured and the air cleaner main body 7 cannot obtain durability against vibration.
As shown by solid lines in FIGS. 9 and 10, the head 21 and the bolt surrounding portion 24 of the air-cleaning splash board 11 are made large by forming a substantially square shape.
To prevent the bolts 14 and 15 from rotating together with the nut, so that a strong tightening torque can be secured. [0011] However, the above-mentioned conventional mounting structure for resin parts has the following problems. That is, in the case of a vehicle 1 such as an automobile or a truck, if an impact due to a collision or the like is applied, first, the cab hinge portion 5 which is weak in strength is deformed, and the cab 4 is moved as a whole rearward. And then cab floor 1
The rear part of the cab 9 is designed so that the rear part of the cab 4 is deformed and the cab 4 is crushed from behind, so that the front part of the cab 4 is maintained. In this way, the collision energy is absorbed. I have. However, as described above, when the air cleaner main body 7 is positioned at the rear portion of the cab 4,
When the rear portion of the cab floor 19 is deformed due to a collision, the rear portion of the cab floor 19 interferes with the air cleaner main body 7, and the rear portion of the cab floor 19 is designed. There is a risk that it will not work. The present invention has been made in view of the above circumstances, and has as its object to provide a mounting structure for a resin component which can obtain a strong fixed state at normal times and can be easily dropped off when an impact force is applied. Things. [0015] An embedded type embedded in the resin component 11 for fastening between the resin component 11 and a mounting member 13 for mounting the resin component 11. The head of the bolt 15 is a large head 21 having a substantially square shape.
In addition, when the impact force is applied to the columnar portion of the embedded bolt 15 which is located between the large head 21 and the screw portion 22 and is embedded in the resin component 11, A resin embedding body 25 having a larger diameter than the screw portion 22 and a smaller embedding depth with respect to the resin component 11 so that the resin component 11 can be pierced by a desired force is formed .
The head size 26 and the embedded trunk diameter 27 of the bolt 15 of the formula
The ratio with the torso embedded depth 28 is 1.6 to 1.4: 1.0:
The present invention relates to a mounting structure of a resin part, which is set to 0.6 to 0.4 . According to the above means, the following effects can be obtained. First, when the resin part 11 is deformed,
If the position of the end of the head 21 of the bolt 15 exceeds the corner between the head 21 of the bolt 15 and the resin embedding body 25 in the bolt surrounding portion 24 of the resin component 11, the bolt 1
5 is separated from the resin component 11. Therefore, if the resin embedding body portion 25 of the embedding type bolt 15 is made larger in diameter than the screw portion 22, the distance between the end portion of the head portion 21 of the bolt 15 and the corner portion is reduced accordingly. Therefore, the end portion of the head 21 of the bolt 15 can be moved beyond the corner portion by deformation of the smaller bolt surrounding portion 24, and when the embedding depth of the resin embedding body 25 is reduced, Resin parts 1 against deformation
As a result, the bolt 15 can break through and be separated from the resin component 11 with a smaller desired force. As described above, the resin embedding body 2 of the embedding bolt 15 having the large head 21 having a substantially square shape.
5 is larger in diameter than the screw portion 22, and the resin embedding body 2
By reducing the embedding depth of No. 5, it is possible to achieve both the two opposing functions of ensuring normal durability with a large tightening torque and easily dropping off when applying an impact force. At this time, in order to separate the bolt 15 from the resin component 11 with a desired force, it is important to optimize the diameter of the resin embedding body 25 and the embedding depth. However, the ratio of the head dimension 26, which is the dimension of one side of the substantially square-shaped head 21 of the embedded bolt 15, the embedded body diameter 27, and the body embedded depth 28 is substantially equal. 1.6-1.
4: 1.0: about 0.6 to 0.4,
The balance between the normal durability and the drop-off property at the time of applying the impact force is obtained, and the ideal embedded bolt 15 is obtained. Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show an embodiment of the present invention applied to an air cleaner mounting structure. Since the structure of the mounting portion of the air cleaner is the same as that shown in FIGS. 5 to 8, the same portions are denoted by the same reference numerals and description thereof will be omitted. In the present invention, an embedded type embedded in a resin part such as the air cleaner splash board 11 for fastening between a resin part such as the air cleaner splash board 11 and a mounting member such as the rear bracket 13 is provided. A cylindrical resin embedding body portion, which is located between a large head portion 21 having a substantially square shape and a screw portion 22 in the bolt 15 and is embedded in a resin component such as the air-cleaning splash board 11. The bolt 25 has a diameter larger than that of the screw portion 22 and an embedding depth in the resin component 11.
4 is characterized in that it is made shallower than in the case of No. 4 so that the force with which the bolt 15 breaks through the air cleaner splash board 11 when an impact force is applied can be set freely. In this case, the ratio of the head dimension 26 of the embedded type bolt 15, the embedded body diameter 27, and the body embedded depth 28 is 1.6 to 1.4: 1.0: It is better to set it to 0.6 to 0.4. Next, the operation will be described. By making the head 21 of the embedded bolt 15 a large one having a substantially square shape,
FIG. 9 and FIG. 9 show a process of preventing slippage between the bolt and the bolt surrounding portion 24 of the air-cleaning splash board 11, preventing the bolt 15 from rotating together with the nut, and securing a strong tightening torque. The description is omitted because it is similar to the case of FIG. According to the present invention, an embedded type embedded in a resin part such as the air cleaner splash board 11 to fasten a resin part such as the air cleaner splash board 11 and a mounting member such as the rear bracket 13 is provided. A cylindrical resin embedding body portion, which is located between a large head portion 21 having a substantially square shape and a screw portion 22 in the bolt 15 and is embedded in a resin component such as the air-cleaning splash board 11. 25 has a diameter larger than that of the screw portion 22 and has a smaller embedding depth in the resin component 11, so that the bolt 15 breaks through the resin component such as the air-clean splash board 11 when an impact force is applied. Can be set freely. That is, first, when a resin part such as the air-cleaning splash board 11 is deformed, the bolt 15
Of the head 21 of the air cleaner splash board 11 in the bolt surrounding portion 24 of the bolt 15
Bolt 15 is over the corner B between the head 21 and the resin embedding body 25 of the air-cleaning splash board 1.
1 will be separated. By the way, the embedded bolt 15 shown in FIG.
In the case of (1), since the resin embedding body portion 23 has the same diameter as the screw portion 22, the distance between AB becomes large, and accordingly, the air cleaning splash board 11 and the bolt surrounding portion 24 must be deformed considerably so that the bolt 15 The end position A of the head 21 cannot exceed the corner B.
Further, since the embedding depth of the resin embedding body 23 is not adjusted and remains deep, the resistance of the air cleaner splash board 11 and the bolt surrounding portion 24 to deformation is increased. As a result, the bolts 15 do not break through the air cleaner splash board 11 unless a considerable force is applied. On the other hand, as shown in FIG. 2, when the resin embedding body portion 25 of the embedding type bolt 15 is made larger in diameter than the screw portion 22, the distance between AB becomes smaller by that amount. Due to the deformation of the smaller air cleaner splash board 11, the end position A of the head 21 of the bolt 15 is changed to the corner B
Can be exceeded. In addition, when the embedding depth of the resin embedding body 25 is reduced, the resistance of the air cleaner splash board 11 and the bolt surrounding portion 24 to deformation is reduced. As a result, the bolt 15 can be moved with less desired force to the air-clean splash board 11.
To be separated. As described above, the resin embedding body 2 of the embedding bolt 15 having the large square head 21 having a substantially square shape.
5 has a diameter larger than that of the screw portion 22 and a smaller embedding depth of the resin embedding body portion 25, thereby ensuring normal durability with a large tightening torque and improving the impact force. It is possible to balance the two opposing functions of easy drop-off. At this time, in order to separate the bolt 15 from the air cleaner splash board 11 with a desired force, it is important to optimize the diameter of the resin embedding body 25 and the embedding depth. However, the ratio of the head dimension 26, which is the dimension of one side of the head 21 of the embedded bolt 15, the embedded body diameter 27, and the body embedded depth 28 is approximately 1.6 to 1.
4: 1.0: about 0.6 to 0.4,
The balance between the normal durability and the drop-off property at the time of applying the impact force is obtained, and the ideal embedded bolt 15 is obtained. For example, the head size 2 of the embedded bolt 15
6 is 16 mm, the embedded trunk diameter 27 is 10φ, and the trunk embedded depth 28 is 6 mm. Alternatively, the head size 26 of the embedded bolt 15 is 14 mm, the embedded body diameter 27 is 10φ, and the body embedded depth 28 is 4 mm. More specifically, the case where the mounting structure of the resin component is applied to the mounting structure of an air cleaner will be described. When the cab 4 is moved rearward as a whole, the cab 4 hits the air cleaner body 7 and
A force shown by an arrow a in FIG. 1 acts on the air cleaner main body 7. Then, the bolt 14 for fastening the front bracket 12 and a resin part such as the air-cleaning splash board 11 is a large embedded bolt 14 having a substantially square head 21 as shown in FIG. Therefore, as described above, unless a considerably large force is applied, the bolt 14 does not break through the air cleaner splash board 11 and is separated.
Receives a clockwise moment about the bolt 14 as shown by the arrow b in FIG. Similarly, the rear arch 6 and the rear bracket 1
3, the rear bracket 13 receives a counterclockwise moment as shown by an arrow c in FIG. 1 at a portion where the rear bracket 13 is fastened to the air cleaner splash board 11. As a result, as shown in FIG. 4, the bolts 15 on the rear bracket 13 pierce through the air-cleaning splash board 11 and are separated for the reasons described above.
The air cleaner body 7 is retracted downward. As a result, the influence of the interference between the rear portion of the cab floor 19 and the air cleaner main body 7 is eliminated, and the rear portion of the cab floor 19 can be deformed as designed. It should be noted that the present invention is not limited to the above-described embodiment, and is not limited to the mounting structure of the air cleaner, but can be widely applied to the mounting structure of a resin component. It goes without saying that various changes can be made without departing from the spirit of the present invention. As described above, according to the resin part mounting structure of the present invention, a strong fixed state can be obtained at normal times, and the resin parts can be easily dropped when an impact force is applied. This can provide an excellent effect of being able to perform.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged schematic side view of an example of an embodiment of the present invention. FIG. 2 is an enlarged view of the embedded bolt of FIG. FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2; FIG. 4 is a view similar to FIG. 1 when an impact force acts on the air cleaner main body. FIG. 5 is a schematic partial side view of a conventional example. FIG. 6 is a schematic enlarged view of FIG. 5; FIG. 7 is a VII-VII enlarged view of FIG. 5; FIG. 8 is a view taken in the direction of arrows VIII-VIII in FIG. 7; FIG. 9 is an enlarged view of the recessed bolt of FIG. FIG. 10 is a view as viewed in the direction of arrows XX in FIG. 9; [Description of Signs] 11 Resin part (air-cleaning splash board) 13 Mounting member (rear side bracket) 15 Embedded bolt 21 Head 22 Screw part 25 Resin embedded trunk 26 Head dimension 27 Embedded trunk diameter Dimension 28 torso embedding depth

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 59-196565 (JP, U) Japanese Utility Model Sho 58-2516 (JP, U) Japanese Utility Model Sho 62-49457 (JP, U) Japanese Utility Model Hei 5 22823 (JP, U) Japanese Utility Model Application Hei 6-23734 (JP, U) Japanese Utility Model Application Hei 5-3050 (JP, U) Japanese Utility Model Application Showa 62-167616 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) F16B 23/00-43/02 F16B 5/00-5/12 B60K 11/00-15/10

Claims (1)

(57) [Claim 1] A resin part (11) for fastening between a resin part (11) and a mounting member (13) for mounting the resin part (11). The head of the embedded bolt (15) to be embedded in 11) is a large head (21) having a substantially square shape, and the large head of the embedded bolt (15). The bolt (15) is provided with a desired force by the bolt (15) at the time of applying an impact force to the cylindrical portion embedded between the (21) and the screw portion (22) and embedded inside the resin component (11). 11) so that the screw (2)
Forming a resin embedding body (25) having a diameter larger than that of 2) and a shallow embedding depth with respect to the resin part (11) ,
Head size (26) and embedded body diameter of bolt (15)
The ratio between the modulus (27) and the torso embedding depth (28) is 1.6 to
1.4: 1.0: 0.6 to 0.4 .