vehicle

Abstract

To improve vibration absorption performance without enlarging a cushioning material in a structure in which a first member is fastened to a second member by a bolt through the elastic cushioning material.SOLUTION: A bracket 2 as a first member is fastened to a surge tank 1 as a second member by a bolt 6 through a cylindrical cushioning material 4. A long groove 12 formed on an outer periphery of the cushioning material 4 is fitted to an inner peripheral portion 11 of the bracket 2. In a center hole 9 of the cushioning material 4, a collar 5 equipped with a flange 5a is fitted. While the bolt 6 is screwed in to compress and deform the cushioning material 4, a clearance 16 is kept between an inner peripheral surface of the cushioning material 4 and an outer peripheral surface of the collar 5. Since the clearance 16 exists between the cushioning material 4 and the collar 5 after fastening, the cushioning material 4 is deformed to accept the vertical rotations of the bracket 2. Therefore, vibration absorption can be improved.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle (automobile ) This is related to the fastening structure of the components. [Background technology]

[0002] Many components in vehicles and engines are fastened to other components, and in order to absorb vibrations, they are fastened (or connected) with bolts via elastic shock absorbers. As an example, Patent Document 1 discloses a method of supporting a body on a frame via mounts (vibration-isolating rubber). Specifically, the flat surface of a bracket is sandwiched between upper and lower mounts, and the upper and lower mounts, bracket, and body are fastened together with bolts and nuts.

[0003] In addition, Patent Document 2 discloses a method for manufacturing a housing having two members disposed in a recess. in Regarding the ring-shaped buffer stopper that is clamped, it is disclosed that an annular recess is formed on the outer peripheral surface of the buffer stopper that abuts on the inner peripheral surface of the housing. In Patent Document 2, when the buffer stopper is compressed in the axial direction by the load of the movable member, the material of the buffer stopper escapes into the recess, thereby reducing the contact area of ​​the buffer stopper with the inner peripheral surface of the housing while maintaining the buffer function and preventing a decrease in the buffer function due to wear of the buffer stopper, etc.

[0004] Meanwhile, many components are arranged around the vehicle and engine and fastened with bolts, but as a measure against vibration, components are fastened via elastic cushioning material (grommets) such as rubber. For example, the bracket that mounts the vacuum switching valve (VSV), which dissipates fuel gas evaporated in the fuel tank into the intake system, is fastened to the intake manifold with bolts via cylindrical cushioning material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-114205 [Patent Document 2] International Publication No. 2017 / 154856 Summary of the Invention [Problem to be solved by the invention]

[0006] Regarding the fastening of the bracket for the VSV, the buffer material is positioned between the bracket and the intake manifold and functions as a kind of spacer, and the relative vibration between the bracket and the intake manifold is absorbed by the deformation of the buffer material. However, when the bolt is fully screwed in, the buffer material is pushed against the collar located inside, and after fastening, there is not enough room for the buffer material to deform, which means that it is unable to fully perform its vibration-absorbing function.

[0007] The same is true in Patent Document 1, where the buffer material is compressed and deformed by fastening with bolts, reducing the compression allowance and preventing the elastic body from fully demonstrating its inherent buffering function. In response to these issues, it could be said that the buffer material could be made larger to ensure the compression allowance, but this method has the problem of increasing the size of the buffer material and components, making it unwise.

[0008] On the other hand, in Patent Document 2, it is speculated that because the compression of the buffer stopper is absorbed by the recess, the recess acts as a clearance for the buffer material, making it more susceptible to elastic deformation when the outer periphery of the buffer stopper abuts against the fixed member. However, although Patent Document 2 speculates that the problem of the outer periphery of the buffer stopper abutting against the housing can be improved, it is speculated that the buffer stopper itself undergoes compressive deformation while its inner periphery is constrained by the member, and therefore it is unlikely that an improvement in axial vibration absorption performance, which is its basic function, can be expected.

[0009] The present invention aims to improve this current situation. [Means for solving the problem]

[0010] The present invention is directed to a vehicle, "A shock absorber made of an elastic material having a center hole through which the shank of a bolt passes, a first member to which the shock absorber is attached, and a second member into which the bolt is screwed, A collar through which the shank of the bolt is inserted is disposed in the center hole of the buffer material. Crate , The axial height of the collar is set to a dimension smaller than the axial height of the buffer material in a free state, When the bolt is screwed in, the buffer material is compressed and deformed between the head of the bolt and the second member. In this basic configuration, " The outer diameter of the collar is set to a dimension smaller than the inner diameter of the cushioning material after fastening. A gap is set between the inner peripheral surface of the cushioning material and the outer peripheral surface of the collar over the entire height and circumference of the central hole after the first member is fastened, and the existence of the gap allows the cushioning material to deform and change the relative position of the first member and the second member. It has the following characteristics.

[0011] The present invention can be embodied in various ways. For example, claim 2 is as follows: "A long groove is formed in the circumferential direction on the outer periphery of the buffer material, The first member is made of a plate material and has an inner peripheral portion that fits into the long groove of the buffer material, and the plate thickness of the first member is set to a value smaller than the groove width of the long groove before being fastened with the bolt. Crate , The collar is provided with a flange of a size that extends radially outward from the head of the bolt when viewed from the axial direction of the collar. " The structure is as follows. [Effects of the Invention]

[0012] In the present invention, after the first member is fastened to the second member, a space is formed inside the cushioning material. Across the entire height and circumference Because of the presence of the ribs, the cushioning material is allowed to bulge inward (relief deformation) even after fastening. Therefore, when an external force is applied due to vibration that moves the first and second members relative to each other, the cushioning material easily deforms, allowing the two members to move relative to each other (especially relative rotation). In other words, the cushioning material absorbs the relative vibration between the two members.

[0013] Furthermore, since the buffer material only has a larger inner diameter than conventional buffer materials, the buffer material and the first member do not become larger, and the buffer material can be made lighter. Therefore, the present invention can improve the buffering function without increasing the size of the buffer material and the first member.

[0014] In claim 2, as a basic configuration, the buffer material has a portion located inside the long groove, Bolt and Although they have mating inner peripheral portions, in this basic configuration, when the first member is in close contact with the inner surface of the long groove, the ring-shaped portion of the buffer material that is located inside the long groove and has the same thickness as the plate thickness of the first member does not undergo compressive deformation even when the bolt is screwed in, and therefore a difference in compression rate occurs in the buffer material.

[0015] In contrast, in the configuration characterized by claim 2, the groove width of the long groove is greater than the plate thickness of the first member, so that the portion of the buffer material located inside the long groove is also compressively deformed when the bolt is screwed in. Therefore, the compressibility of the buffer material is made uniform as a whole, and vibration absorption against relative movement between the first member and the second member can be promoted. [Brief explanation of the drawings]

[0016] [Figure 1] 1A and 1B are diagrams showing a first embodiment, in which (A) is an external view and (B) is a cross-sectional view taken along line BB of (A). [Figure 2] 1A and 1B are diagrams showing a first embodiment, in which (A) is a cross-sectional view before fastening, and (B) is a cross-sectional view after fastening. [Figure 3] 4 is a cross-sectional view showing second to fourth embodiments and a reference example. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] (1) First embodiment Next, embodiments of the present invention will be described with reference to the drawings. First, a first embodiment shown in FIGS.

[0018] In Figure 1(A), reference numeral 1 denotes a part (part of the peripheral wall) of a surge tank that constitutes an intake manifold. Figure 1(A) and Figures 2(A) and (B) are viewed from the crankshaft axis direction, and show part of the peripheral wall of the hollow, cylindrical surge tank 1. In Figure 1(A), the cylinder head is located on the left side of the surge tank 1.

[0019] In Figure 1(A), reference numeral 2 denotes a bracket to which a vacuum switching valve (VSV, purge control valve) is attached, which is provided in a circuit that returns fuel vaporized in the fuel tank to the surge tank 1. The bracket 2 is fastened to a boss portion 3 formed on the surge tank 1 with a bolt 6 via a buffer material 4 and a collar 5. The collar 5 is made of metal plate or synthetic resin and is equipped with a flange 5a.

[0020] In this embodiment, in relation to the claims, the bracket 2 corresponds to the first member and the surge tank 1 corresponds to the second member. Since the bracket 2 and the surge tank 1 are accessories of the engine, the subject of the invention is the engine. Vehicles equipped with The VSV opens when the pressure inside the surge tank 1 becomes negative, and purge gas is sent into the surge tank 1.

[0021] The bracket 2 has a first plate portion 2a that extends vertically and a second plate portion 2b that is perpendicular to the first plate portion 2a, forming an L-shaped cross section (angle shape), and the VSV is attached to the second plate portion 2b. One end of the bracket 2 is bent diagonally downward, and the second plate portion 2b at the diagonally downward end is fastened to a boss portion 3 of the surge tank 1. An end of the second plate portion 2b is bent to form an end plate 8 for reinforcement. The surge tank 1 is formed with a stopper 7 that abuts the inclined portion of the first plate portion 2a of the bracket 2 to prevent rotation when fastened with the bolt 6.

[0022] The cushioning material 4 is made of synthetic resin or natural rubber, and has a central hole 9 into which the collar 5 fits, forming a basic cylindrical shape. Therefore, the central hole 9 is a straight hole having the same diameter over the entire height.An attachment hole 10 having a diameter smaller than the outer diameter of the buffer material 4 is formed in the second plate portion 2b constituting the bracket 2, while a long groove 12 is formed in the circumferential direction on the outer surface of the buffer material 4, which fits into the inner peripheral portion 11 of the second plate portion 2b. The long groove 12 is formed at the mid-height of the buffer material 4. Therefore, the buffer material 4 has a vertically symmetrical shape and has no vertical directionality.

[0023] In this case, the second plate portion 2b is formed with a cutout portion 13 that communicates with the mounting hole 10 and opens on the opposite side to the first plate portion 2a, so that the buffer material 4 of The cutout 13 is configured so that it can be pushed in against elasticity. Therefore, the mounting hole 10 of the second plate portion 2b and the long groove 12 of the buffer material 4 form a keyhole shape as a whole.

[0024] It is possible to form the long groove 12 in a closed loop shape (annular) and the mounting hole 10 in a closed system without forming the cutout 13, but from the viewpoint of ease of fitting the buffer material 4, it is preferable to form the cutout 13 as in the embodiment. The groove width of the cutout 13 is set to a dimension smaller than the outer diameter of the collar 5, so the buffer material 4 will not come off the bracket 2 after being fastened with the bolt 6.

[0025] The bolt 6 has a flanged hexagonal head 6a and is screwed into a nut 14 inserted into the boss portion 3 of the surge tank 1. The buffer material 4 is pressed in the axial direction by the flange 5a of the collar 5. A flat washer 15 is placed between the flange 5a of the collar 5 and the bearing surface of the bolt 6. The flange 5a of the collar 5 has a diameter larger than the outer diameter of the flat washer 15. It is also possible to directly abut the head 6 a of the bolt 6 against the collar 5 .

[0026] As shown in FIG. 2(A), before fastening with the bolt 6 (a free state where no load is applied to the buffer material 4), Height (length / thickness) L1 is color 5 Height (length) The inner diameter D1 of the cushioning material 4 is set to be larger than the outer diameter D2 of the collar 5 by a certain amount.

[0027] After being fastened by the bolt 6, the buffer material 4 is compressed in the axial direction, and the collar 5 comes into contact with the boss portion 3 of the surge tank 1, thereby determining the screw-in depth of the bolt 6. In this state, a small gap 16 of dimension e is left between the inner surface of the buffer material 4 and the outer surface of the collar 5 over the entire height and circumference of the central hole 9. That is, the outer diameter D2 of the collar 5 is set to be smaller than the inner diameter of the cushioning material 4 after compression deformation. Even after fastening, a deformation allowance is secured to allow for collapse and deformation of the buffer material 4. Specifically, L1-L2 can be set to about 4.0 to 6.0 mm, D1-D2 to about 1.0 to 2 mm, and e to about 0.5 to 1.0 mm.

[0028] As shown partially in Figure 2(B) by the dashed and double-dashed lines, the bracket 2 and surge tank 1 move relative to each other due to vibrations caused by engine operation and vibrations caused by driving, and an external force is generated on the bracket 2 that causes it to rotate relative to the surge tank 1, but because there is a gap 16 between the cushioning material 4 and the collar 5, the cushioning material 4 is allowed to deform so as to tilt its axis, and the bracket 2 rotates as shown by the dashed and double-dashed lines.

[0029] That is, the bracket 2 tilts and rotates around the lower end of the collar 5 as a fulcrum while elastically deforming the buffer material 4. This allows the vibration of the bracket 2 to be accurately absorbed by the buffer material 4. Therefore, the buffer material 4 exhibits high vibration-absorbing performance.

[0030] Furthermore, a simple structure that forms a gap 16 between the inner periphery of the cushioning material 4 and the outer periphery of the collar 5 is sufficient, so there is no problem of increasing the size of the cushioning material 4 or the bracket 2. Note that the cushioning material 4 and collar 5 can be set in place before use to reduce the effort required for managing the components, and one end face of the cushioning material 4 and the flange 5a of the collar 5 can be temporarily fastened together with an adhesive (in the embodiment, the cushioning material 4 is first attached to the bracket 2, and then the collar 5 is inserted into the cushioning material 4).

[0031] (2) Other embodiments Next, another embodiment shown in FIG. and reference examplesThe second embodiment shown in (A) of Fig. 3 embodies claim 2, and differs from the first embodiment in that the groove width S of the long groove 12 of the buffer material 4 is set to a dimension larger than the plate thickness t of the bracket 2. In this embodiment, the area located inside the long groove 12 (the area shown in shaded area) also undergoes compressive deformation, so that the entire buffer material 4 is deformed, further promoting deformation after fastening.

[0032] In this case, if the compressive deformation rate of the shaded area is set to be approximately the same as that of the other areas, the density of the cushioning material 4 after fastening can be made uniform as a whole, and vibrations of the bracket 2 can be absorbed uniformly throughout the entire cushioning material 4. This therefore contributes to uniforming the internal stress of the cushioning material 4 and improving durability.

[0033] In the third embodiment shown in Figure 3(B), the collar 5 is formed in a hand-drum shape with its upper and lower middle portions tapered. By adopting this configuration, the bolt 6 and collar 5 can be kept concentric by setting the inner diameter of the small diameter portion of the collar 5 to be approximately the same as the outer diameter of the bolt 6. The center hole 9 of the cushioning material 4 can also be formed in a hand-drum shape to match the shape of the collar 5.

[0034] As shown in Figure 3(C) This is a reference example. In the illustrated example, inward protrusions 17 are provided on the inner periphery of cushioning material 4 as a temporary holding means and centering means for cushioning material 4 and collar 5, and inward protrusions 17 elastically contact the outer periphery of collar 5. Inward protrusions 17 may be formed in a ring shape that continues uninterrupted in the circumferential direction, or multiple inward protrusions 17 may be scattered around the circumferential direction. In the illustrated example, inward protrusions 17 are provided near one end of long groove 12, but they can also be provided at the same height as long groove 12, or on both the top and bottom sides of long groove 12.

[0035] The first step shown in FIG. 4In this embodiment, an annular recessed groove 18 is formed on the inner peripheral surface of the buffer material 4, inside the long groove 12. In this embodiment, when the bolt 6 is screwed in, the material on the inner peripheral portion tends to escape into the recessed groove 18, making it possible to make the compressive deformation of the buffer material 4 as uniform as possible. In other words, this contributes to making the compressive deformation rate of the buffer material 4 uniform throughout. Therefore, the stress generated by vibration of the bracket 2 is made uniform throughout the entire buffer material 4, contributing to improving durability.

[0036] Although the embodiment of the present invention has been described above, the present invention can be embodied in various other ways. For example, the object member can be used to support a purge gas canister on a vehicle frame (body). Of course, the present invention can also be applied to attaching other members. In the embodiment, the outer shape of the cushioning material is circular, but it can also be formed into a polygonal shape. [Industrial Applicability]

[0038] The present invention can be embodied in a vehicle or engine in which components are connected via a shock absorber, and therefore has industrial applicability. [Explanation of symbols]

[0039] 1. Surge tank as an example of the second member 2. VSV mounting bracket as an example of the first member 3 Boss section 4 Cushioning material 5 Colors 5a flange 6 volts 7 Stopper 9 center hole 11 Inner circumference 12 Nagamichi 14 Nut 16 Gap

Claims

1. The bolt mounting device comprises an elastic buffer material having a center hole through which the shank of the bolt passes, a first member to which the buffer material is attached, and a second member into which the bolt is screwed, a collar through which the shank of the bolt is inserted is disposed in the center hole of the buffer material; The axial height of the collar is set to a dimension smaller than the axial height of the buffer material in a free state, so that when the bolt is screwed in, the buffer material is compressed and deformed between the head of the bolt and the second member, The outer diameter of the collar is set to a dimension smaller than the inner diameter of the buffer material after fastening, so that a gap is created between the inner surface of the buffer material and the outer surface of the collar over the entire height and circumference of the central hole after fastening the first member, and the existence of this gap allows the buffer material to deform and change the relative position between the first member and the second member. vehicle.

2. A long groove is formed in the circumferential direction on the outer periphery of the buffer material, the first member is made of a plate material and has an inner peripheral portion that fits into the long groove of the buffer material, and the plate thickness of the first member is set to a value smaller than the groove width of the long groove before being fastened with the bolt, Furthermore, the collar is provided with a flange having a size that extends radially outward from the head of the bolt when viewed from the axial direction of the collar. A vehicle according to claim 1.

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