JPH068758U - Fuel filter pipe connection structure - Google Patents

Abstract

(57) [Summary] [Purpose] The pipe is a fuel filter that does not require high-precision processing by screwing a tubular bolt that tapers the pipe into the connection port so that it can swing slightly to the connection port. Connect securely to the connection port of. [Structure] The fuel filter case has a metal connection port with a threaded hole formed through the shaft center, and an external thread formed on the outer periphery that is screwed into the threaded hole to communicate with the shaft center. A metal bolt having a hole formed therethrough and having a large-diameter flange portion formed at the outer end thereof, and a metal pipe fitted and fixed to the communication hole of the bolt are provided, and the bolt is connected to the connection port. In a pipe connection structure of a fuel filter which is screw-fitted into a screw hole, by increasing a dimensional difference between a root diameter and an inner diameter of the female thread of the screw hole and an outer diameter and a root diameter of the male thread of the bolt, the screw Allow some swinging of the bolt with respect to the hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel filter pipe connection structure for connecting a pipe to a fuel filter.

[0002]

[Prior art]

 In FIG. 3 and FIG. 4, B is a fuel filter attached to the side part of the engine of the automobile, in which the metal inflow connection port 2 and the outflow connection port 5 are provided on the base 1a of the sealed metal case 1. And a metal oil feed pipe 4 communicating with the fuel tank via a fastener 3 is connected to the inflow connection port 2 and the carburetor is connected to the outflow connection port 5 via a cylindrical bolt 8. A metal oil supply pipe 11 communicating with the is connected.

The outflow connection port 5 has a screw hole 6 penetrating in the vertical direction at the axial center thereof. Small diameter and annular locking projections 5a and 5b are formed at the upper and lower ends of the outflow connection port 5, and the upper locking projections 5a are fitted into the mounting holes formed in the base 1a. By fitting the stopper projections 5b into the mounting holes formed in the bracket 7, crimping the periphery of each mounting hole in the direction of the locking projections 5a and 5b and crimping, and then brazing the fitting portions, 1a, the outflow connection port 5 and the bracket 7 are integrally fixed.

The above-mentioned bolt 8 is formed with a male screw 8 a that is screwed into the screw hole 6 of the outflow connection port 5 on the outer peripheral portion, a communication hole 9 is formed through the shaft center portion, and has a large diameter at the lower end portion. The flange portion 10 is formed, and the oil supply pipe 11 is brazed and fixed to the communication hole 9. The female screw 6a and the male screw 8a of the screw hole 6 are JIS standard M14. That is, the root diameter and inner diameter of the female screw 6a are 14.0 mm and 12052 mm, and the outer diameter and trough diameter of the male screw 8a are 13.7 mm and 11.8 mm. Then, the bolt 8 is screwed into the screw hole 6 of the outflow connection port 5 until the flange portion 10 abuts on the lower locking projection 5b to connect the oil supply pipe 11 to the outflow connection port 5.

[0005]

[Problems to be solved by the device]

 In the above-mentioned conventional one, since the female thread 6a of the screw hole 6 formed in the outflow connection port 5 and the male thread 8a formed on the outer circumference of the bolt 8 are formed according to the dimensions of JIS standard, there is a margin between them. When the base 1a and the bracket 7 are caulked and fixed to the outflow connection port 5, the screw hole 6 of the outflow connection port 5 is deformed to a small diameter, or the screw hole 6 is covered with plating, the bolt 8 There was a point that the screw could not be screwed into the screw hole 6. Further, the bolt 8 is closely screwed into the screw hole 6, and the bolt 8 is always positioned coaxially with the outflow connection port 5. For this reason, when the locking projection 5b at the lower part of the outflow connection port 5 and the flange portion 10 of the bolt 8 are inclined with respect to the axis due to a processing error, a gap is generated at the contact portion between the two and oil is leaked. There was a flaw. Since the above processing errors cannot be eliminated due to the accuracy of the processing machine, conventionally, 100% inspection was performed after assembly to remove defective products in advance, but this requires labor and yields. There was a drawback that it deteriorated and productivity decreased. In order to solve this, there is a means for interposing a soft packing between the locking projection 5b and the flange portion 10. However, since the fuel filter B is heated by the engine heat, the packing is deteriorated by the heat. However, there is a drawback that durability becomes poor. An object of the present invention is to obtain a novel oil filter oil pipe connection structure that solves the above-mentioned drawbacks.

[0006]

[Means for Solving the Problems]

 The present invention is configured as follows to achieve the above object. That is, a metal connection port having a threaded hole formed in the shaft center portion is fixed to the case of the fuel filter, and a male screw that is screwed into the threaded hole is formed on the outer peripheral portion to communicate with the shaft center portion. Provided are a metal bolt having a hole formed therethrough and a large-diameter flange portion formed on the outer end thereof, and a metal pipe fitted and fixed in the communication hole of the bolt, and the bolt is connected to the connection port. In a pipe connection structure of a fuel filter in which the pipe is connected to the connection port by screw-fitting into a screw hole, the root diameter and inner diameter of the female thread of the screw hole and the outer diameter and trough diameter of the male thread of the bolt The dimensional difference is increased to allow a slight swing of the bolt with respect to the screw hole.

[0007]

[Action]

 Since the present invention is configured as described above, when the bolt is screwed into the screw hole of the connection port, the flange portion of the bolt abuts the outer end surface of the connection port. In this case, if the flange portion and the outer end surface of the connection port are inclined with respect to the shaft center due to a processing error, the bolts swing in a predetermined direction with respect to the screw hole due to these reaction forces. The flange portion and the outer end surface of the connection port come into uniform contact with each other.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a partial cross-sectional side view of a fuel filter showing an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of a pipe connecting portion thereof. In FIG. 1, A is a fuel filter attached to a side portion of an automobile engine, and a metal inlet port 16 and an outlet port 19 made of metal are fixed to a base 15a of a sealed metal case 15. A metal oil feed pipe 18 communicating with the fuel tank is connected to the inflow connection port 16 via a fastener 17, and the outflow connection port 19 is connected to the carburetor via a cylindrical bolt 22. A metal refueling pipe 25 is connected.

The outflow connection port 19 has a screw hole 20 penetrating in the vertical direction at its axial center. Small and annular locking projections 19a and 19b are formed at the upper and lower ends of the outflow connection port 19, and the upper locking projection 19a is fitted in the mounting hole formed in the base 15a. 19b is fitted into the mounting hole formed in the bracket 21, and the periphery of each mounting hole is crimped by crimping in the direction of the locking projections 19a and 19b, and then each fitting portion is brazed to allow the base 15a to flow out. The connection port 19 and the bracket 21 are integrally fixed.

The above-mentioned bolt 22 has an external thread 22a formed in the outer peripheral portion to be screwed into the screw hole 20 of the outflow connection port 19, a communication hole 23 formed through the axial center portion, and a large diameter at the lower end portion. A flange portion 24 is formed, and an oil supply pipe 25 is brazed and fixed to the communication hole 23. Here, the external thread 22a of the bolt 22 is formed to JIS standard M14, that is, the outer diameter is 14 mm and the root diameter is 12.376 mm. Further, the female screw 20a of the screw hole 20 is formed to have a diameter which is about 1/100 to 3/10 larger than JIS M14. In this embodiment, the female screw 20a has a root diameter of 14.03 mm and an inner diameter of 12.6 mm, so that the bolt 22 can be slightly swung in the screw hole 20. The internal thread 20a may be sized according to the JIS standard, and the screw 22a may be formed with a diameter smaller than the JIS standard size by about 1/100 to 3/10. Then, the bolt 22 is screwed into the screw hole 20 of the outflow connection port 19 until the flange portion 24 abuts on the lower locking projection 19b, and the refueling pipe 25 is connected to the outflow connection port 19.

According to the above-described embodiment, when the bolt 22 is screwed into the threaded hole 20 of the inflow connection port 16, the flange portion 24 of the bolt 22 is engaged with the locking projection 19b at the bottom of the inflow connection port 16. Abutting, the oil supply pipe 25 is connected to the inflow connection port 16. In this case, if the flange portion 24 and the locking projection 19b are inclined with respect to the shaft center due to a processing error, the bolt 22 swings in a predetermined direction with respect to the screw hole 20 due to a reaction force of these. Then, the flange portion 24 uniformly abuts on the locking projection 19b at the lower portion of the inflow connection port 16, and no gap portion is formed at the abutting portion of both.

[0012]

[Effect of device]

 As is apparent from the above description, in the present invention, the bolt to which the pipe is connected is screwed into the connection port so that the bolt can be slightly swung. Therefore, the pipe can be installed in the fuel filter without high processing accuracy. An effect that can be surely connected to the connection port is exhibited.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing an embodiment of the present invention.

FIG. 2 is an enlarged side sectional view of a main part of FIG.

FIG. 3 is a partial cross-sectional side view showing a conventional example.

FIG. 4 is an enlarged side sectional view of a main part of FIG.

[Explanation of symbols]

 A Fuel filter 15 Case 15a Base 16 Inflow connection port 17 Tightening tool 18 Oil pipe 19 Outflow connection port (connection port) 19a Locking protrusion 19b Locking protrusion 20 Screw hole 20a Female screw 21 Bracket 22 Bolt 22a Male screw 23 Communication hole 24 Flange 25 Oil supply pipe

Claims (1)

[Scope of utility model registration request] 1. A fuel filter case is fixed with a metal connection port having a screw hole penetrating through the shaft center,
A male screw having an external thread formed on the outer peripheral portion to be screwed with the screw hole, a communication hole penetrating the shaft center portion, and a large-diameter flange portion formed on the outer end portion, and a communication of the bolt. In a pipe connection structure of a fuel filter, which is provided with a metal pipe to be fitted and fixed in the hole, and the bolt is screwed into the screw hole of the connection port to connect the pipe to the connection port, the screw hole A pipe for a fuel filter, characterized in that the dimensional difference between the root diameter and the inner diameter of the female thread and the outer diameter and the root diameter of the male thread of the bolt is increased to allow a slight swing of the bolt with respect to the screw hole. Connection structure.