JP2014043868A - Member mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member mounting structure in which a mounting member is easy to be assembled to a member for a vehicle.SOLUTION: An engaging piece 1 provided at a VSV is mounted to an air cleaner hose 2. In the engaging piece 1, a cross section when cut in a direction orthogonal to an axial direction of a through hole 5 is a flat shape surrounded by a short side part 11 and a long side part 12 which is longer than the short side part 11. A tip of the engaging piece 1 has a fitting projection part 10 whose width widens from a side end part in the width direction to the width direction. The width of a top part of the fitting projection part 10 where the width is the widest in the width direction is larger than the length in the width direction of an outlet opening end 5b of the through hole 5. A pedestal part 3 is a material softer than that of the engaging piece 1. At a long side facing part 52 which faces the long side part 12 of the engaging piece 1 in the through hole 5 of the pedestal part 3, a chamfer part 6 is formed.

Description

  The present invention relates to a member mounting structure for mounting a mounting member to a vehicle member.

  The engine room of the vehicle houses many engine peripheral devices including the engine. Engine operation requires a large number of engine peripheral devices, and inevitably a large number of devices are clustered around the engine. For this reason, one of the engine peripheral devices is used as a mounting base, and the other mounting member is fixed to the mounting base.

  For example, an air cleaner hose, which is one of the intake devices, has a relatively large outer diameter and is often used as a mounting base for engine peripheral devices. Among engine peripheral devices, there is a vacuum switching valve (hereinafter referred to as VSV). For fixing the VSV to the air cleaner hose, for example, as disclosed in Japanese Patent Application Laid-Open No. 2008-75493, a bracket is protruded from the lower part of the VSV, and the air cleaner hose is provided with a pedestal portion in which a through hole is formed. Keep it. The VSV is fixed to the air cleaner hose by inserting the bracket into the through hole.

  Here, the opening thickness of the through hole and the thickness of the bracket are set to be substantially the same so that there is no gap between them so that the bracket does not wobble due to engine vibration. For this reason, the insertion load when inserting the bracket into the through hole is high, and a great amount of labor and time are required for assembly.

  Therefore, as disclosed in JP-A-11-121307, it is conceivable to reduce the insertion load into the through hole by forming a chamfered portion on the bracket. However, even if the chamfered portion is formed on the bracket, the insertion load is still high and the assembly is difficult.

JP 2008-75493 A JP-A-11-121307

  This invention is made | formed in view of this situation, and makes it a subject to provide the member attachment structure which is easy to assemble | attach an attachment member to the member for vehicles.

(1) In the member mounting structure of the present invention, a locking piece provided in the mounting member is inserted into a through hole formed in the base portion of the vehicle member having the base portion, and the mounting member is inserted into the vehicle member. Is a member mounting structure for mounting,
The locking piece of the mounting member has a flat shape in which a cross section when cut in a direction orthogonal to the axial direction of the through hole is surrounded by a short side portion and a long side portion longer than the short side portion. Presents
The front end portion of the locking piece has a fitting protrusion that is widened in the width direction from the side end portion in the width direction, and the width of the top portion that is widest in the width direction of the fitting protrusion is the outlet of the through hole. It is larger than the length in the width direction of the opening end, the fitting protrusion of the locking piece protrudes from the outlet opening end of the through hole, and the locking piece is inserted into the through hole,
The pedestal portion is a softer material than the locking piece,
In the through hole of the pedestal part, the long side facing part facing the long side part of the locking piece is shaped to be separated from the long side part of the locking piece toward the inlet opening end of the through hole And a chamfered portion is formed to relieve the pulling deformation of the long side facing portion toward the inside of the through hole due to the insertion of the locking piece when the locking piece is inserted.

  According to the said structure, the through-hole formed in the base part of the member for vehicles is a hole by which a locking piece is inserted. The through hole has a long side facing portion that faces a long side portion of the locking piece. A chamfered portion having a shape that is separated from the long side portion of the locking piece toward the inlet opening end of the through hole is formed on the long side facing portion of the through hole. The chamfered portion is a portion that alleviates the pull-in deformation of the long side facing portion toward the inside of the through hole when the locking piece is inserted. For this reason, the insertion load into the through hole of the locking piece, particularly the insertion load in the vicinity of the inlet opening end of the through hole is reduced.

  The long side facing portion of the through hole is a portion facing the long side portion of the locking piece, and is a portion having a large area in contact with the locking piece in the inner peripheral surface of the through hole. In addition, by forming a chamfered portion at the long side facing portion, compression by the long side facing portion when the locking piece is inserted is reduced, and the insertion load of the locking piece is greatly reduced. Therefore, the attachment member can be easily assembled to the vehicle member.

  (2) The chamfering margin in the thickness direction of the chamfered portion is preferably 0.50 mm or more. In this case, the chamfering margin of the chamfered portion is large enough to alleviate the pull-in deformation of the inlet opening end of the through hole when the locking piece is inserted. Therefore, the insertion load of the locking piece can be greatly reduced.

  (3) The ratio (X / *) of the axial length (X) of the chamfered portion to the axial length (*) from the tip of the fitting protrusion to the top is 0.5 or more. It is preferable that it is 1.2 or less. In this case, the insertion load of the locking piece can be effectively reduced.

  According to the member mounting structure of the present invention, since the chamfered portion is formed at the entrance opening end of the long side facing portion of the through hole formed in the base of the vehicle member, the mounting member can be easily assembled to the vehicle member.

It is sectional explanatory drawing of the entrance opening end vicinity of the through-hole at the time of the locking piece insertion in Example 1 of this invention when a chamfering part exists. It is AA arrow sectional drawing of FIG. It is sectional explanatory drawing of the entrance opening end vicinity of the through-hole at the time of a locking piece insertion for the case of a case without a chamfering part for a comparison. 1 is a plan view of an air cleaner hose in Embodiment 1. FIG. In Example 1, it is a perspective view of the base part which has a through-hole which inserted the locking piece. In Example 1, it is a perspective view of the base part before inserting a locking piece in a through-hole. They are AA arrow sectional drawing (a) of FIG. 4 and BB arrow sectional drawing (b) of FIG. In Example 1, it is sectional drawing of the base part before inserting a locking piece in a through-hole. In Example 1, it is sectional drawing of a base part in order to show the dimensional relationship between the through-hole and a locking piece. In Example 2, it is sectional drawing of the entrance opening end vicinity of a through-hole. It is a diagram which shows the change of the insertion load with the insertion progress of the locking piece with and without a chamfer part in an experimental example. It is a diagram which shows the change of the insertion load with the insertion progress of a locking piece at the time of changing the axial direction length of a chamfering part in an experiment example. It is a diagram which shows the insertion load and extraction load of a locking piece at the time of changing the axial direction length of a chamfering part in an experiment example.

  The member mounting structure according to the embodiment of the present invention attaches the mounting member to the vehicle member by inserting the locking piece projecting from the mounting member into the through hole formed in the base portion of the vehicle member. Yes.

  The locking piece provided on the mounting member has a flat shape in which a cross section when cut in a direction orthogonal to the axial direction of the through hole is surrounded by a short side and a long side longer than the short side. . The cross section of the locking piece has a shape surrounded by an outer peripheral portion having a pair of opposing short sides and a pair of opposing long sides. Each of the short side portion and the long side portion may extend linearly, or may have a curved line. The cross section of the locking piece has, for example, a long rectangular shape such as a rectangle or an ellipse.

  The ratio of the length of the long side portion to the length of the short side portion is greater than 1 and is preferably 5.0 or more and 15.0 or less.

  The front end portion of the locking piece has a fitting protrusion that is wider in the width direction than the side end portion in the width direction. The fitting protrusions may project in the width direction from the side end portions on both sides in the width direction of the locking piece. The pair of fitting protrusions protruding from the side end portions on both sides are stably fitted to the outlet opening ends of the through holes, and the attachment member can be stably fixed to the vehicle member.

  Here, the “width direction” means the width direction of the locking piece and is the direction along the longest width of the cross section of the locking piece. This width direction substantially coincides with the extending direction of the long side portion of the locking piece.

  The width of the top portion widened in the width direction of the fitting protrusion is larger than the length in the width direction of the outlet opening end of the through hole. When the locking piece is inserted through the through hole, the fitting protrusion is securely locked to the outlet opening end of the through hole, and the locking piece can be prevented from falling out of the through hole.

  A chamfered portion is formed at the inlet opening end of the pair of long side facing portions of the through hole. The inlet opening end refers to an opening end serving as an inlet of the through hole when the locking piece is inserted into the through hole. On the other hand, the opening end where the locking piece protrudes from the through hole is referred to as the outlet opening end.

  As shown in FIGS. 1 and 2, when the chamfered portion 6 is formed on the long side facing portion 52 of the through hole 5 of the pedestal portion 3, the engagement piece 1 is inserted as compared with the case where the chamfered portion is not formed. The load can be reduced. The reason is considered as follows.

  As shown in FIG. 2, the long side facing portion 52 of the through hole 5 is a portion facing the long side portion 12 of the locking piece 1 and contacts the locking piece 1 in the inner peripheral surface of the through hole 5. This is a large area. In addition, as shown by a two-dot chain line in FIG. 2, the long side facing portion 52 is expanded in the long side direction by the fitting protrusion 10 at the tip of the locking piece 1, and the long side facing portion 52 is engaged. The gap in the short side direction of the through hole 5 is narrowed so as to sandwich the stopper piece 1 in the thickness direction. For this reason, as shown in FIG. 3, the frictional force of the locking piece 1 at the inlet opening end 5a increases.

  When the locking piece 1 is inserted into the through hole 5, the long side facing portion 52 of the inlet opening end 5 a of the through hole 5 is brought into contact with the outlet opening end 5 b of the through hole 5 by the frictional force caused by the insertion of the locking piece 1. Trying to deform in the direction of pulling in.

  As shown in FIG. 3, when the inlet opening end 5a has no chamfered portion, when the locking piece 1 is inserted into the through hole 5, a deformed portion in the vicinity of the inlet opening end 5a (dotted line portion in FIG. 3). The deformation range W (deformation amount) increases. Therefore, the long side facing portion 52 of the through hole 5 can store a large deformation load. Therefore, in order to insert the locking piece 1, a large insertion load exceeding the deformation load stored in the long side facing portion 52 is required. For this reason, the insertion load becomes extremely large at the time of insertion, particularly when the fitting protrusion 10 of the locking piece 1 passes through the inlet opening end 5a (initial stage of insertion).

  On the other hand, as shown in FIG. 1, when the chamfered portion 6 is present at the inlet opening end 5 a of the through hole 5, the upper end of the long side facing portion 52 of the through hole 5 is located behind the inlet opening end 5 a. Will be located. Therefore, when the chamfered portion 6 is formed at the inlet opening end 5a, the deformation range W (deformation amount) of the deformed portion (dotted line portion in FIG. 1) in the vicinity of the inlet opening end 5a is compared with the case where the chamfered portion is not provided. ) Becomes smaller. Therefore, the locking piece 1 starts to slide toward the inside of the through hole 5 and is inserted with a low load. For this reason, it is thought that the insertion load when passing through the inlet opening end 5a of the fitting protrusion 10 of the locking piece 1 can be effectively reduced.

  Here, the chamfering margin D in the thickness direction of the chamfered portion is preferably 0.50 mm or more (FIG. 9). The upper limit of the chamfering allowance D in the thickness direction of the chamfered portion is not particularly specified, but is preferably about 0.6 times the axial length X of the chamfered portion. When the chamfering margin D is too small, the inner surface of the chamfered portion is squeezed inward by the frictional force between the locking piece and the through hole when the locking piece is inserted into the through hole. There is a risk that the insertion load will rapidly increase due to the pulling deformation phenomenon of the long side facing portion toward the inside of the through hole. On the other hand, when the chamfering allowance D is excessive, the inner side surface of the chamfered portion when the locking piece is inserted through the through hole has an angle that is too large with respect to the insertion direction. It has not changed. For this reason, the same behavior as when the chamfered portion is not formed is exhibited, and in this case also, a phenomenon in which the insertion load rapidly rises due to the pulling phenomenon of the long side facing portion toward the inside of the through hole occurs. There is a risk. Note that “the pull-in deformation phenomenon toward the inside of the through-hole” means that the inner peripheral surface of the through-hole, particularly the long side facing portion, is pulled in toward the inside of the through-hole (the direction in which the locking piece is inserted). A phenomenon that causes some deformation.

  The ratio (X / E) of the axial length X of the chamfered portion to the axial length E of the through hole is preferably 0.10 or more and 0.30 or less, and more preferably 0.15 or more and 0.30 or less. There is preferably (FIG. 7). When the ratio (X / E) is too small, the inner peripheral surface of the through hole may be pulled in at the start position on the outlet opening side of the chamfered portion. When the ratio (X / E) is excessive, the force with which the pedestal portion holds the locking piece is weakened, so that there is a possibility that mounting members such as peripheral devices are likely to vibrate.

  The chamfered portion has a shape that is separated from the long side portion of the locking piece from the inside of the through hole toward the inlet opening end. The chamfered portion may have an inclined surface inclined in a direction away from the long side portion of the locking piece from the inside of the through hole toward the inlet opening end, or from the inside of the through hole toward the inlet opening end. A stepped shape may be provided so as to be separated from the long side portion of the locking piece. Among these, it is preferable that the chamfered portion has an inclined surface that is inclined in a direction away from the long side portion of the locking piece from the inside of the through hole toward the inlet opening end. This is because when the chamfered portion is deformed by inserting the locking piece, the stress concentration on the chamfered portion can be reduced.

  When a virtual straight line is drawn between the start position on the outlet opening end side and the end position on the inlet opening end side of the chamfered portion, the inclination angle G of the virtual straight line with respect to the axial direction of the through hole is 5 ° or more and 30 It is preferable that it is below (degree) (FIG. 9). The lower limit of the tilt angle G is preferably 9 °, and the upper limit of the tilt angle G is preferably 20 °, and more preferably 15 °. When the inclination angle G of the chamfered portion is too small, it becomes a surface which is substantially parallel to the long piece facing portion of the through hole, and the chamfered portion pulls in the long side facing portion when the locking piece is inserted into the through hole. There exists a possibility that the effect which suppresses a deformation | transformation may reduce.

  On the other hand, when the inclination angle G is excessive, the inner surface of the chamfered portion is not different from the end surface rather than the chamfered portion because the angle with respect to the insertion direction is too large. For this reason, the same behavior as when the chamfered portion is not formed is exhibited. In this case also, when the locking piece is inserted into the through-hole, the inside of the through-hole is at the start position on the outlet opening side of the chamfered portion. There is a risk of pulling deformation of the peripheral surface.

  The chamfered portion may form a flat inclined surface from the start position on the outlet opening end side toward the end position on the inlet opening end side, or may form a curved inclined surface. When the chamfered portion is a curved inclined surface, it is preferable that the tangent to the curved inclined surface is curved in a concave shape while maintaining the inclination with respect to the axial direction of the through hole. In this case, the insertion load at the start of insertion into the through hole of the locking piece can be effectively reduced.

  When the chamfered portion has a curved surface, the tangent line L1 created with respect to the chamfered portion at the start position on the outlet opening end side faces the outlet opening end side with respect to the radially inner side of the through hole. It is preferable to incline at an angle Y in the range of 30 ° to 45 ° (FIG. 10). Further, the tangent line L2 created with respect to the chamfered portion at the end position of the inlet opening end has an angle H exceeding 0 ° toward the radially inner side of the through hole with respect to the outlet opening end side in the axial direction of the through hole. It is preferable that the inclination is larger and less than 20 ° (FIG. 10). In this case, the distance a between the start position S on the outlet opening end side of the chamfered portion and the intersection P between the radial line passing through the start position S and the tangent L2 is 0.5 to 2 mm. Good (FIG. 8). The ratio of a to the axial length X of the chamfered portion (a / X) is preferably 0.1 to 0.4. In this case, the effect of reducing the insertion load by the chamfered portion is increased.

  The inner peripheral surface of the through hole of the pedestal portion has a pair of long side facing portions that respectively face the pair of long side portions of the locking piece. The width between both side portions in the width direction of the through hole may be the same in the axial direction or may be different. Preferably, the width is gradually narrowed from the inlet opening end side toward the outlet opening end side. The ratio (B2 / B1) of the width B2 at both ends in the width direction of the through hole at the inlet opening end to the width B1 at both ends in the width direction of the through hole at the outlet opening end is 1 or more and 1.2 or less. There should be. This is to reduce the punching load of the mold when forming the through hole.

  The distance between the pair of long side facing portions of the through hole, that is, the opening thickness of the through hole is preferably substantially the same as or narrower than the thickness between the long side portions of the locking pieces. This is to prevent glitches and dropouts in the through holes of the locking pieces.

  Since the opening thickness of the through hole is approximately the same as or less than the thickness between the long sides of the locking piece, the through hole formed in the soft pedestal is expanded by the locking piece when the locking piece is inserted. And is inserted through the through hole. For this reason, the locking piece is clamped in a state where it is pressed at the long side facing portion of the through hole, and is securely fixed to the through hole.

  The pedestal is softer than the locking piece. The hardness of the pedestal (JIS standard) is preferably A65 or more and A85. In this case, the attachment member can be attached to the vehicle member without wobbling, and the insertion load of the locking piece at the time of attachment can be kept low.

  The pedestal portion is not particularly limited as long as it is a softer material than the locking piece, and is formed of, for example, a rubber material, a resin material, or the like. The locking piece is not particularly limited as long as it is a material harder than the pedestal portion, and is formed of, for example, a resin material, a rubber material, a metal material, or the like. The locking piece is preferably a metal material or a resin material, and the pedestal is preferably a rubber material. Examples of the rubber material used for the pedestal include ACM (acrylic rubber), CR (chloroprene), EPDM (ethylene-propylene-diene terpolymer rubber), NBR (acrylo-nitrile-butadiene rubber), TPO ( Olefin-based thermoplastic elastomer).

  Examples of the vehicle member having the pedestal include a vehicle member in an engine room, and specifically include an air intake device such as an air cleaner hose and an inlet duct.

  As an attachment member, engine peripheral devices, such as a solenoid valve, are mentioned, for example. Examples of the electromagnetic valve include VSV.

Example 1
The member mounting structure of this example will be described with reference to the drawings.

  As shown in FIG. 4, the vehicle member is an air cleaner hose 2 having a pedestal portion 3. As shown in FIG. 5, a VSV (vacuum switching valve) 7 as an attachment member is attached to a pedestal portion 3 formed on the air cleaner hose 2. The pedestal portion 3 is formed with a through hole 5 penetrating in the vertical direction. The VSV 7 is fixed to the air cleaner hose 2 by inserting the locking piece 1 protruding from the VSV 7 into the through hole 5. The VSV 7 is an electromagnetic valve that is provided in the middle of the purge pipe of the vehicle and adjusts the flow rate of the evaporated fuel in the purge pipe. The purge pipe is a pipe provided between the canister that adsorbs the evaporated fuel and the intake path. The supply amount of the evaporated fuel to the intake passage is adjusted by adjusting the flow rate of the evaporated fuel by the VSV.

  As shown in FIG. 6, the locking piece 1 is a bracket for attaching the VSV 7 to the air cleaner hose 2. The locking piece 1 has a rectangular shape with a flat cross section when cut in a direction perpendicular to the axial direction of the through hole 5. The flat shape of the cross section of the locking piece 1 is a shape surrounded by a pair of opposing short side portions 11 and a pair of opposing long side portions 12. The short side portion 11 and the long side portion 12 have a linear shape. The length of the short side portion 11, that is, the thickness T of the locking piece 1 is 1.4 mm (FIG. 9), and the length of the long side portion 12, that is, the width U of the locking piece 1 is 14 mm (FIG. 8). ).

  As shown in FIG. 8, the distal end portion of the locking piece 1 has a fitting protrusion 10 widened in the width direction from the side end portions on both sides in the width direction. The fitting protrusion 10 has a hook shape that gradually expands in the width direction from the tip 10a in the axial direction. The length (*) in the axial direction from the tip 10a of the fitting protrusion 10 to the top portion 13 widened in the width direction of the fitting protrusion 10 is 5 mm. The width A of the top portion 13 widened in the width direction of the fitting projection 10 is 21 mm, and the width A of the top portion 13 of the fitting projection 10 is larger than the width B of the outlet opening end 5 b of the through hole 5. . The locking piece 1 is locked to the periphery of the outlet opening end 5 b of the through hole 5 at the top portion 13 of the fitting protrusion 10, thereby preventing the locking piece 1 from falling off the through hole 5.

  As shown in FIGS. 8 and 2, the through hole 5 formed in the pedestal portion 3 has an opening having a size substantially the same as the cross section of the locking piece 1. The through hole 5 is surrounded by a short side facing portion 51 that faces the short side portion 11 of the locking piece 1 and a long side facing portion 52 that faces the long side portion 12 of the locking piece 1. The short side facing portion 51 forms a curved surface that is slightly recessed in the width direction of the through hole 5, and the long side facing portion 52 forms a plane that makes surface contact with the long side portion 12 of the locking piece 1.

  As shown in FIG. 9, the distance between the long side facing portions 52, that is, the opening thickness C of the through hole 5 is 1.2 mm. The distance between the short side facing portions 51, that is, the width of the through hole 5, is gradually narrowed from the inlet opening end 5a toward the outlet opening end 5b. The width B2 of the through hole 5 at the inlet opening end 5a is 15 mm, the width B1 of the through hole 5 at the outlet opening end 5b is 14 mm, and the inlet with respect to the width B1 of the through hole 5 at the outlet opening end 5b. The ratio (B2 / B1) of the width B2 of the through hole 5 at the opening end 5a is 1.07.

  A chamfered portion 6 is formed at each of the inlet opening ends 5 a of the pair of long side facing portions 52 of the through hole 5. The chamfered portion 6 is inclined in a direction away from the long side portion 12 of the locking piece 1 from the inside of the through hole 5 toward the inlet opening end 5a.

  As shown in FIG. 9, the opening thickness C of the through hole 5 is 1.2 mm, and the chamfering margin D in the thickness direction of the chamfered portion 6 is 0.9 mm. As shown in FIG. 7B, the axial length E of the through hole 5 is 25 mm, and the axial length X of the chamfered portion 6 is 5 mm. The ratio of the axial length X of the chamfered portion 6 to the axial length E of the through hole 5 is 0.2. As shown in FIG. 8, the ratio (X / *) of the axial length X of the chamfered portion 6 to the axial length * from the tip 10 a to the top portion 13 of the fitting protrusion 10 is 1. .

  As shown in FIG. 9, the chamfered portion 6 is inclined in a planar shape from the start position S on the outlet opening end 5b side to the end position F of the inlet opening end 5a. The inclination angle G of the chamfered portion 6 with respect to the axial direction of the through hole 5 is 20 °.

  As shown in FIG. 2, a gap 8 is formed between the inlet opening end 5 a of the through hole 5 and the locking piece 1. The gap 8 is a chamfering margin of the chamfered portion 6 formed at the inlet opening end 5 a of the through hole 5. The short side portion 11 of the locking piece 1 faces the short side facing portion 51 of the inlet opening end 5 a of the through hole 5 with the gap 8 interposed therebetween. The long side portion 12 of the locking piece 1 faces the long side facing portion 52 of the inlet opening end 5 a of the through hole 5 through the gap 8. The periphery of the locking piece 1 is surrounded by the inlet opening end 5 a of the through hole 5 through the gap 8.

  The air cleaner hose 2 having the pedestal portion 3 is formed by injection-molding EPDM material, and the locking piece 1 provided on the VSV 7 is formed by punching a metal material. The hardness (JIS standard) of the base 3 is A78, the hardness (STKM) of the locking piece 1 is 10 to 12C, and the base 3 is softer than the locking piece 1.

  A through hole 5 formed in the base portion 3 of the air cleaner hose 2 is a hole into which the locking piece 1 is inserted. The long side facing portion 52 facing the long side portion 12 of the locking piece 1 of the through hole 5 is inclined in a direction away from the long side portion 12 of the locking piece 1 toward the inlet opening end 5 a of the through hole 5. A chamfered portion 6 is formed. The chamfered portion 6 is a portion in which the long side facing portion 52 relaxes the pulling deformation of the locking piece 1 toward the inside of the through hole 5 when the locking piece 1 is inserted. For this reason, when inserting the locking piece 1 into the through hole 5, the insertion load between the inlet opening end 5a of the through hole 5 and the locking piece 1 at the time of insertion is reduced.

  In particular, the long side facing portion 52 of the through hole 5 is a portion facing the long side portion 12 of the locking piece 1, and a portion having a large area in contact with the locking piece 1 in the inner peripheral surface of the through hole 5. It is. Moreover, by forming the chamfered portion 6 in the long side facing portion 52, the insertion load of the locking piece 1 when inserting the through hole can be greatly reduced. Therefore, it becomes easy to assemble the VSV 7 with the locking piece 1 projecting to the air cleaner hose 2.

(Example 2)
In this example, as shown in FIG. 10, the chamfered portion 6 formed at the inlet opening end 5a of the through hole 5 has a curved surface. The chamfered portion 6 is inclined in a curved shape from the start position S on the outlet opening end 5b side to the end position F of the inlet opening end 5a. The tangent L1 created with respect to the chamfered portion 6 at the start position S of the chamfered portion 6 is inclined at an angle Y45 ° toward the outlet opening end 5b side with respect to the radially inner side of the through hole 5. Further, the tangent line L2 created with respect to the chamfered portion 6 at the end position F of the chamfered portion 6 has an angle H10 toward the radially inner side of the through hole 5 with respect to the outlet opening end 5b side of the through hole 5 in the axial direction. Inclined at °. The distance a between the start position S on the outlet opening end 5b side of the chamfered portion 6 and the intersection P between the radial line passing through the start position S and the tangent L2 is 0.5 mm. The distance a, the angle Y, and the angle H can be set within a preferable range depending on the axial length X of the chamfered portion 6. Others are the same as in the first embodiment.

  In this example, the chamfered portion 6 formed at the inlet opening end 5a of the through hole 5 has a curved surface. For this reason, the insertion load in the initial stage of insertion can be reduced.

<Experimental example>
In this experimental example, the trend of the insertion load during the insertion of the locking piece was measured when the chamfered portion was formed in the through hole and when the chamfered portion was not present. Example 1 was adopted as a case where a chamfered portion was formed in the through hole. The dimensions and shapes of the through hole and the chamfered portion are all as described in the first embodiment. On the other hand, as a case where the through hole has no chamfered portion, a case in which the chamfered portion is not formed in the through hole of Example 1 was adopted.

  FIG. 11 is a diagram showing a change in insertion load with the progress of insertion of the locking piece. The horizontal axis of FIG. 11 shows the amount of displacement from the through hole inlet opening end 5a at the tip of the locking piece 1 to be inserted, and the vertical axis shows the insertion load accompanying the insertion of the locking piece. As shown in FIG. 11, when the chamfered portion is present, the insertion load is reduced over the entire course of insertion compared to the case without the chamfered portion. In particular, the insertion load at the initial stage of insertion from the start of insertion to the insertion depth of 5 mm was greatly reduced by increasing the length X of the chamfered portion 6.

  Next, when the length X of the chamfered portion 6 was changed, a change in insertion load with the progress of insertion of the locking piece was measured. The axial length X of the chamfer 6 was changed to 0.5 mm, 1.3 mm, 2.6 mm, 4.2 mm, 5.1 mm, and 6.2 mm. The chamfered portion 6 is a flat inclined surface, and the chamfering margin D in the thickness direction of the chamfered portion 6 is constant at 0.9 mm. The length (*) in the axial direction from the tip 10a of the fitting projection 10 to the top portion 13 widened in the width direction of the fitting projection 10 was constant at 5 mm. The length E in the axial direction of the through hole 5 is 25 mm. The inclination angle G of the virtual straight line drawn between the axial length X of the chamfer 6 and the end position F of the start position S of the chamfer 6, the axial direction of the through hole 5 Length E, the ratio (X / E) of the axial length X of the chamfered portion 6 to the axial length E of the through hole 5, and the axial direction from the tip 10a of the fitting projection 10 to the top portion 13 Table 1 shows the ratio (X / *) of the axial length (X) of the chamfered portion 6 to the length (*). Other various dimensions are the same as those in the first embodiment.

  FIG. 12 is a diagram showing a change in insertion load with the passage of the locking piece when the axial length X of the chamfered portion is changed as described above. The horizontal axis of FIG. 12 shows the amount of displacement from the through-hole inlet opening end 5a of the distal end portion of the locking piece 1 to be inserted, and the vertical axis shows the insertion load accompanying the insertion of the locking piece. As shown in FIG. 12, as the length X of the chamfered portion 6 is increased, the insertion load is reduced throughout the course of insertion. Also in this case, in particular, the insertion load in the initial insertion A during the insertion from the start of insertion to the insertion depth of 5 mm was greatly reduced by increasing the length X of the chamfered portion 6.

  Next, the locking piece 1 was inserted into the through hole 5 having the chamfered portion 6 whose length X was changed as described above. The insertion load of the locking piece at that time was measured. Further, the extraction load when the locking piece was extracted was also measured.

  FIG. 13 is a diagram showing the insertion load and the extraction load of the locking piece when the axial length X of the chamfered portion is changed. The horizontal axis in FIG. 13 indicates the axial length X of the chamfered portion, and the vertical axis indicates the load applied to the locking piece in the axial direction during insertion or extraction.

  As shown in FIG. 13, as the length X of the chamfered portion 6 is increased, both the insertion load and the extraction load are reduced. When the length X of the chamfered portion 6 was increased, the insertion load was lower than the extraction load. Further, when the length X of the chamfered portion 6 was 4 to 6 mm, both the insertion load and the extraction load showed a substantially low value. The ratio (X / *) of the axial length (X) of the chamfered portion 6 to the axial length (*) from the tip 10a to the top 13 of the fitting protrusion 10 is 0.5 or more. When it was 5 or less, and further 0.8 or more and 1.2 or less, the insertion load was halved.

  On the other hand, when the length X of the chamfered portion 6 is increased, the insertion load at the initial insertion A is reduced. When the length X of the chamfered portion 6 is 5.1 mm or more, the insertion load at the initial insertion A is equal to zero. As shown in FIG. 1, the reason is that as the ratio of the length X of the chamfered portion 6 to the chamfering margin D increases, the inner peripheral surface of the through hole 5 is pulled in at the start position S on the outlet opening side of the chamfered portion 6. It is considered that the deformation range W in which the deformation occurs becomes very narrow, and the locking piece 1 starts to slide toward the inside of the through hole 5 and is inserted with a very low load.

  1: locking piece, 10: fitting protrusion, 10a: tip, 11: short side, 12: long side, 13: top, 2: air cleaner hose (member for vehicle), 3: pedestal, 5: Through hole, 5a: inlet opening end, 5b: outlet opening end, 51: short side facing portion, 52: long side facing portion, 6: chamfered portion, 7: VSV (vehicle member).

Claims (3)

A member mounting structure in which a locking piece provided in an attachment member is inserted into a through hole formed in the pedestal portion of a vehicle member having a pedestal portion, and the attachment member is attached to the vehicle member,
The locking portion of the attachment member has a flat shape in which a cross section when cut in a direction orthogonal to the axial direction of the through hole is surrounded by a short side portion and a long side portion longer than the short side portion. Presents
The front end portion of the locking piece has a fitting protrusion that is widened in the width direction from the side end portion in the width direction, and the width of the top portion that is widest in the width direction of the fitting protrusion is the outlet of the through hole. It is larger than the length in the width direction of the opening end, the fitting protrusion of the locking piece protrudes from the outlet opening end of the through hole, and the locking piece is inserted into the through hole,
The pedestal portion is a softer material than the locking piece,
In the through hole of the pedestal part, the long side facing part facing the long side part of the locking piece is shaped to be separated from the long side part of the locking piece toward the inlet opening end of the through hole And a chamfered portion that reduces a pull-in deformation of the long side facing portion toward the inside of the through-hole due to the insertion of the locking piece when the locking piece is inserted. Construction.   The member mounting structure according to claim 1, wherein a chamfering margin in a thickness direction of the chamfered portion is 0.50 mm or more.   The ratio (X / *) of the axial length (X) of the chamfered portion to the axial length (*) from the tip of the fitting protrusion to the top is 0.5 or more and 1.2. The member mounting structure according to claim 1 or 2, wherein:

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