JP2010214993A - Fuel pipe fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel pipe fixing structure capable of fixing a fuel pipe to a vehicle body stably by a simple configuration and further assuring an earth connection for the fuel pipe. <P>SOLUTION: A fuel pipe fixing structure 10 is a structure for use in fixing a fuel pipe 12 to a vehicle body 20 by fixing supporting members 18 for supporting the fuel pipe 12 to the vehicle body 20 coated with rust-proof coating P. This fixing structure 10 includes a bolt 26 protruded from the vehicle body 20 and coated with the rust-proof coating P and an electrical conductive cap nut 38 capable of removing the rust-proof coating P placed at a threaded part 26a of the bolt 26 when it is fastened to the bolt 26, wherein the supporting members 18 are formed by electrical conductive resin material and are fixed to the vehicle body 20 with the bolt 26 and the cap nut 38. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel pipe fixing structure for fixing a fuel pipe to a vehicle body by a support member.

  For example, in a car equipped with an engine on the front side, when a fuel tank is installed on the rear side, it is necessary to connect the engine and the fuel tank with a fuel pipe. Such a fuel pipe extends from the rear side to the front side along the floor of the vehicle body, and is fixed to the vehicle body side by a predetermined support member or the like at a plurality of locations.

  In Patent Document 1, as a support member that fixes a fuel pipe to a vehicle body, an elastic member is interposed in a pipe holding member that holds the fuel pipe, and the support member is locked to a bolt on the vehicle body side. A configuration in which a stop member is fitted is described.

Japanese Patent Application Laid-Open No. 2001-241569

  In the configuration described in Patent Document 1, since it is necessary to use a pipe holding member, an elastic member, a locking member, and the like, the structure for attaching the fuel pipe to the vehicle body is complicated.

  In addition, a bolt is inserted into the non-conductive rubber member, and a load receiving flange formed on the top of the locking member is hit with a hammer, thereby attaching to the vehicle body side. For this reason, the periphery of the bolt fixed to the vehicle body side is covered with the nonconductive elastic member, and the fuel pipe cannot be grounded. For example, a dedicated ground wire or the like needs to be connected. To do. This is because, when static electricity is generated by fuel flowing in the fuel pipe, it is necessary to ground the fuel pipe to the vehicle body in order to avoid charging of the static electricity. In particular, it is more difficult to ensure the ground when the surfaces of the vehicle body and bolts are rust-proofed.

  In addition, since the mounting of the support member to the vehicle body is simply configured by hitting from the top and locking with a bolt, torque management related to mounting cannot be performed, so that the mounting quality tends to vary and stable mounting is performed. Is difficult.

  The present invention has been made in consideration of the above-described conventional problems. The fuel pipe can stably fix the fuel pipe to the vehicle body with a simple configuration and can also secure the ground of the fuel pipe. An object of the present invention is to provide a fixing structure.

  The fuel pipe fixing structure according to the present invention is a fuel pipe fixing structure for fixing the fuel pipe to the vehicle body by attaching a support member for supporting the fuel pipe to the rust-prevented vehicle body, A bolt that protrudes from the vehicle body and has a rust preventive coating; and a conductive cap nut that can remove the rust preventive coating on the screw portion of the bolt when fastened to the bolt, and the support member includes: It is formed of a conductive resin material, and is attached to the vehicle body by the bolt and the conductive cap nut.

  According to such a configuration, the fuel pipe can be fixed to the vehicle body with a simple structure for fastening the conductive cap nut and the bolt. In addition, since the support member is formed of a conductive resin material and the antirust coating of the bolt is removed by the conductive cap nut, the antirust coating is applied to the surface of the vehicle body and the bolt. However, it is possible to secure the grounding structure at the same time as fixing the fuel pipe.

  The support member has a base portion in which a bolt insertion hole into which the bolt is inserted is formed, and a pipe holding portion that is arranged in parallel with the base portion and holds the fuel pipe, and the bolt insertion hole It is preferable that the conductive cap nut is fastened to the bolt inserted into the vehicle body to be attached to the vehicle body.

  When the torque management required for mounting the support member is performed by tightening the conductive cap nut to a position where the bottom portion of the conductive cap nut contacts the tip of the bolt, the conductive cap nut is simply conductive. By simply tightening the cap nut until it comes into contact with the tip of the bolt, the fastening operation can be performed easily and with stable torque management, and the mounting quality can be made uniform.

  Furthermore, when the conductive cap nut is fastened to the bolt and the support member is fixed to the vehicle body, a reaction force in the axial direction of the bolt is generated in the base portion. Since the support member is sandwiched and repelled between the conductive cap nuts, rattling can be prevented more reliably and the fuel pipe can be held more stably. Can do.

  In this case, a leg portion that generates a reaction force in a direction of separating the support member from the vehicle body side in a state where the support member is attached to the vehicle body is provided on the surface of the support member on the vehicle body side. Thus, the support member can be fixed to the vehicle body more stably.

  According to the present invention, the fuel pipe can be fixed to the vehicle body with a simple structure for fastening the conductive cap nut and the bolt. In addition, since the support member is formed of a conductive resin material and the antirust coating of the bolt is removed by the conductive cap nut, the antirust coating is applied to the surface of the vehicle body and the bolt. However, it is possible to secure the grounding structure at the same time as fixing the fuel pipe.

It is a lineblock diagram showing typically a fuel pipe and its peripheral part to which a fixing structure of a fuel pipe concerning one embodiment of the present invention is applied. 2A is a plan view of the support member when not attached to the vehicle body, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 2A. It is sectional drawing explaining the state which fixed the fuel pipe to the vehicle body with the supporting member shown to FIG. 2A and 2B.

  Hereinafter, a fuel pipe fixing structure according to the present invention will be described in detail with reference to the accompanying drawings by giving preferred embodiments in relation to the support member of the fuel pipe used in the fixing structure.

  FIG. 1 is a configuration diagram schematically showing a fuel pipe 12 to which a fuel pipe fixing structure 10 according to an embodiment of the present invention is applied and its peripheral portion. The fuel pipe fixing structure 10 (hereinafter also referred to as “fixing structure 10”) allows fuel (for example, gasoline) to flow between a fuel tank 14 made of a metal material such as iron and an engine (internal combustion engine) 16. The fuel pipe 12 that is a path to be connected to the vehicle body is fixed to the vehicle body (floor) 20 using a support member 18 that is a resin conductive clamp.

  In the present embodiment, evaporation purged from a feed pipe 12a that feeds fuel from a fuel pump 22 provided in the fuel tank 14 to the engine 16 and a canister 24 that adsorbs evaporated fuel (vapor) in the fuel tank 14. Two pipes composed of a purge pipe 12b for supplying air containing fuel to the engine 16 are collectively referred to as a fuel pipe 12, and a structure for fixing the fuel pipe 12 to the vehicle body 20 is exemplified. The fuel pipe to be fixed by may be only one of the feed pipe 12a and the purge pipe 12b.

  2A is a plan view of the support member 18 in a state where it is not attached to the vehicle body 20, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 2A. 2B also shows bolts 26, cap nuts 38, and the like used when attaching the support member 18 to the vehicle body 20. FIG.

  2A and 2B, the support member 18 has a substantially rectangular parallelepiped shape formed of a conductive resin material (conductive resin), and a bolt insertion hole 28 through which a bolt 26 protruding from the vehicle body 20 is inserted is formed. The base portion (fixed portion) 30 is provided, and a pipe holding portion 32 that is integrally provided on the base portion 30 and holds the fuel pipe 12. Examples of the conductive resin material include a material obtained by mixing a predetermined resin material with a metal material such as a SUS filler and a conductive filler such as carbon, or a conductive material that imparts conductivity to a predetermined hard synthetic rubber or the like. The elastic member etc. which consist of can be mentioned. In addition, from the viewpoint of ease of attachment when the support member 18 is fixed to the vehicle body 20, prevention of rattling, and the like, the conductive resin material has conductivity and has a predetermined elasticity. For example, polyacetal (POM) to which carbon black is added may be used.

  The base portion 30 includes the bolt insertion hole 28, a pair of leg portions 34a and 34b which are bent and protruded from the lower surface on the vehicle body 20 side, and a shallow recess 36 having a substantially cross shape which is formed to be slightly depressed on the upper surface. Have.

  The bolt insertion hole 28 has a depth that penetrates the vicinity of the center portion of the base portion 30 so that the tip end side of the screw portion 26a of the bolt 26 can be exposed. The leg portions 34a, 34b are stretched against the vehicle body 20 when the support member 18 is fixed to the vehicle body 20, and generate a reaction force in the direction of separating (lifting) the support member 18 from the vehicle body 20 side. It is. The concave portion 36 is a portion on which a cap nut 38 to be fastened to the screw portion 26a of the bolt 26 inserted through the bolt insertion hole 28 is seated.

  The pipe holding part 32 is provided with a pair of cylinder parts 40a and 40b for holding the feed pipe 12a and the purge pipe 12b constituting the fuel pipe 12 in parallel, and a pair of cylinder parts 40a and 40b are respectively provided at the openings. Projecting pieces 42a and 42b face each other.

  The cylinder portions 40a and 40b have a substantially cylindrical shape extending along the extending direction of the fuel pipe 12 (a direction perpendicular to the axial direction of the bolt 26), and an opening along the extending direction on the upper surface side thereof. Is provided. The opening portions are simply opened and closed by the projecting pieces 42a and 42b, thereby preventing the feed pipe 12a and the purge pipe 12b held in the cylindrical portions 40a and 40b from coming off (see FIG. 3). For this reason, the pair of protruding pieces 42a (42b) are opposed to and close to each other with a gap narrower than the outer diameter of at least the feed pipe 12a (purge pipe 12b), and the feed pipe 12a (purge pipe 12a) 12b) is formed with sufficient elasticity. Further, the pair of projecting pieces 42a (42b) are arranged in the insertion direction (the axial direction of the bolt 26) of the feed pipe 12a (purge pipe 12b) from the base end side (upper side in FIG. 2B) to the front end side (lower side in FIG. 2B). Inclined toward each other so as to be close to each other. As a result, the feed pipe 12a (purge pipe 12b) can be easily inserted and held, and the structure is difficult to come off.

  Next, the structure 10 for fixing the fuel pipe 12 to the vehicle body 20 using the support member 18 basically configured as described above and the function and effect thereof will be described with reference to FIG.

  FIG. 3 is a cross-sectional view for explaining a state in which the fuel pipe 12 is fixed to the vehicle body 20 by the support member 18. In the fixing structure 10, the bolt 26 is formed of a conductive metal member, and after being fixed to the vehicle body 20 made of the conductive metal member by welding or the like, the bolt 26 includes a screw portion 26 a. 26 and the surface of the vehicle body 20 are provided with a rust preventive coating P (shown by minute dot patterns in FIGS. 2 and 3). The rust preventive coating P is applied, for example, by electrodeposition coating, and substantially becomes an insulating layer. On the other hand, the cap nut 38 is formed of a conductive metal member, and its top portion is, for example, a dome shape and has a bag shape in which the screw portion 26a does not protrude.

  First, as shown in FIG. 3, in order to hold the predetermined position of the fuel pipe 12 in the pipe holding part 32, the feed pipe 12a is pushed into one cylinder part 40a, and the purge pipe 12b is put into the other cylinder part 40b. Push in. At this time, the inner diameters of the cylinder portions 40a and 40b are set to be approximately the same as the inner diameters of the feed pipe 12a and the purge pipe 12b. Thus, the feed pipe 12a and the purge pipe 12b do not rattle in the cylinder portions 40a and 40b, and the feed pipe 12a and the purge pipe 12b and the cylinder portions 40a and 40b are in close contact with each other. Connected to. The feed pipe 12a and the purge pipe 12b arranged in the cylindrical portions 40a and 40b are more reliably held by the action of preventing the protruding pieces 42a and 42b from coming off. In addition, you may implement the holding process to the pipe holding part 32 of such a fuel pipe 12 after the attachment process to the vehicle body 20 of the support member 18 mentioned later.

  Next, while the bolt 26 protruding from the vehicle body 20 is inserted into the bolt insertion hole 28, the support member 18 is pressed toward the vehicle body 20, and the screw portion 26 a of the bolt 26 protrudes from the upper opening of the bolt insertion hole 28. Let Subsequently, a cap nut 38 is placed on the screw portion 26a of the bolt 26 protruding from the bolt insertion hole 28, and is fastened with a predetermined tool (for example, a wrench) not shown. Then, as the cap nut 38 seated in the recess 36 is tightened, the base portion 30 of the support member 18 gradually bends (shrinks), and the fastening is completed when the predetermined fastening strength (fastening torque) is obtained.

  In this case, according to the fixing structure 10, the fuel pipe 12 can be easily and reliably fixed to the vehicle body 20 with a simple structure for fastening the cap nut 38 and the bolt 26. At this time, the fastening torque for fastening the cap nut 38 to the bolt 26 is set so as to be a predetermined torque when the cap nut 38a is tightened until the tip of the screw portion 26a abuts against the bottom portion 38a of the cap nut 38. Good. As a result, simply tightening the cap nut 38 until it comes into contact with the tip of the bolt 26 enables the fastening operation to be performed easily and with stable torque management, and the mounting quality can be made uniform.

  Moreover, since the cap nut 38 is seated and tightened in the recess 36 on the upper surface of the base portion 30, the fastening can be performed more stably. Further, since the cap nut 38 is fastened while seated in the recess 36 on the upper surface of the base portion 30, the support member 18 (base portion 30) is always constant around the recess 36 as the cap nut 38 is tightened. Therefore, the fastening can be performed with more stable quality.

  As shown in FIG. 3, the support member 18 that has completed the fastening operation is sandwiched between the vehicle body 20 and the cap nut 38 with the bolt 26 as a support and has a moderately bent shape. Accordingly, a reaction force Fr1 which is a repulsive force opposite to the tightening force F by the cap nut 38 is generated in the fastened support member 18 in the axial direction of the bolt 26, and the vehicle body 20 and the cap nut 38 Thus, rattling can be prevented more reliably, and the fuel pipe 12 can be held stably. In addition, leg portions 34 a and 34 b are provided on the lower surface of the support member 18, and in a state where the support member 18 is attached to the vehicle body 20, the leg portions 34 a and 34 b are also in a direction away from the vehicle body 20 side. Since the force Fr2 is generated, the support member 18 can be more securely attached to the vehicle body 20, and rattling after the attachment can be more reliably prevented.

  In the fixing structure 10, as the cap nut 38 is tightened to the bolt 26, the screw portions of the cap nut 38 and the bolt 26 are brought into sliding contact with each other, and the anticorrosion coating applied to the screw portion 26 a of the bolt 26. P is removed. That is, the cap nut 38 is a so-called paint cut nut. Therefore, at the same time as the cap nut 38 and the bolt 26 are fastened, both can be easily electrically connected.

  Therefore, the fuel pipe 12 (feed pipe 12a and purge pipe 12b) and the pipe holding portion 32 (cylinders 40a and 40b) are electrically connected, and the cap nut 38 and the bolt 26 are electrically connected. Further, the bolt 26 and the vehicle body 20 are electrically joined by welding or the like. That is, in the fixing structure 10, even when the antirust coating P is applied to the surfaces of the vehicle body 20 and the bolts 26, the ground structure can be configured simultaneously with the fixing of the fuel pipe 12. As a result, static electricity or the like generated in the fuel pipe 12 flows from the pipe holding portion 32 (cylinder portions 40a and 40b) to the base portion 30 side, and is transferred to the bolt 26 via the cap nut 38 that is in close contact with the base portion 30. As a result, the bolt 26 is grounded from the inside of the bolt 26 to the inside of the vehicle body 20.

  Of course, about the site | part of the volt | bolt 26 to which the cap nut 38 is not fastened, the antirust coating P is not peeled off, but the durability can be ensured by effectively maintaining the antirust performance. Of course, since the antirust coating P on the surface of the vehicle body 20 is also retained, the durability of the vehicle body 20 is ensured, and furthermore, the antirust coating P at the joint between the vehicle body 20 and the bolt 26 can also be retained. That is, according to the present embodiment, it is possible to reliably ensure conductivity among the support member 18, the cap nut 38, the bolt 26, and the vehicle body 20 that require conductivity, while being exposed to other outside air. The bolt 26 which is a part and the antirust coating P on the surface of the vehicle body 20 can be held.

  Moreover, since the fixing structure 10 is provided with the above-described rattling prevention structure (reaction force Fr1 at the base portion 30 and reaction force Fr2 at the legs 34a and 34b), the cap nut 38 and the base portion are provided. 30 is more securely contacted and the contact state is maintained, so that the ground structure can be more reliably maintained.

  Further, by using the cap nut 38 as a fastening nut, the tip of the bolt 26 is not inadvertently protruding upward, and other parts of the vehicle can be prevented from being damaged.

DESCRIPTION OF SYMBOLS 10 ... Fuel pipe fixing structure 12 ... Fuel pipe 18 ... Support member 20 ... Vehicle body 26 ... Bolt 28 ... Bolt insertion hole 30 ... Base part 32 ... Pipe holding part 34a, 34b ... Leg part 38 ... Cap nut

Claims (5)

A fuel pipe fixing structure for fixing the fuel pipe to the vehicle body by attaching a support member for supporting the fuel pipe to the vehicle body coated with rust prevention,
Bolts that protrude from the vehicle body and are coated with rust prevention,
When fastened to the bolt, a conductive cap nut capable of removing the anticorrosive coating on the screw portion of the bolt,
With
The fixing structure of a fuel pipe, wherein the support member is formed of a conductive resin material and is attached to the vehicle body by the bolt and the conductive cap nut. In the fixing structure of the fuel pipe according to claim 1,
The support member has a base portion in which a bolt insertion hole into which the bolt is inserted is formed, and a pipe holding portion that is arranged in parallel with the base portion and holds the fuel pipe, and the bolt insertion hole The fuel pipe fixing structure, wherein the conductive cap nut is fastened to the bolt inserted into the vehicle body to be attached to the vehicle body. In the fixing structure of the fuel pipe according to claim 1 or 2,
A fuel pipe characterized in that torque management required for mounting the support member is performed by tightening the conductive cap nut to a position where a bottom portion of the conductive cap nut contacts a tip portion of the bolt. Fixed structure. In the fixing structure of the fuel pipe according to any one of claims 1 to 3,
The fuel is characterized in that a reaction force in the axial direction of the bolt is generated in the base portion in a state where the conductive cap nut is fastened to the bolt and the support member is fixed to the vehicle body. Pipe fixing structure. In the fixing structure of the fuel pipe according to any one of claims 1 to 4,
A leg portion that generates a reaction force in a direction of separating the support member from the vehicle body side in a state where the support member is attached to the vehicle body is provided on a surface of the support member on the vehicle body side. This is a fuel pipe fixing structure.

Images