JPS61206890A - Joint fitting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a joint fitting, and particularly to a joint fitting provided at a hydraulic branch point of a hydraulic brake for an automobile.

(Prior Art) Fig. 2 shows a conventional automotive hydraulic brake joint fitting that is the basis of the present invention.A fitting body 10 is provided with a recess 14 in which a threaded portion 12 is formed on the inner peripheral surface. has been done. At the center of the bottom surface of the recess 14, one end of a channel 18 that penetrates the metal fitting body 10, branches off, and communicates with the outside is opened. A metal tube 16 having a seat portion 15 at one end is press-fitted into the flow path 18 . In order to connect the pipe body 20 as a brake pipe using this joint fitting, a flare nut (not shown), which has a threaded portion formed on the outer circumferential surface and is slidable in the axial direction of the pipe body 20, is attached to the fitting body. 10 threaded parts 12
This is done by screwing and tightening the tube body 20, and pressing the flare 22 formed at the end of the tube body 20 and the seat portion 15 into contact with each other.

(Problem to be Solved by the Invention) However, in such conventional fittings, the seat portion is made of metal, so if the seat portion is located eccentrically from the center of the bottom surface of the recess, it will not be possible to tighten the fitting. When the seat part does not deform, a gap is created between the flare and the seat part, causing oil leakage. For this reason, it is necessary to position the seat part at the center of the bottom surface of the recess through precision machining of the seat part, the flow path, etc., which poses a problem in that the number of man-hours increases and the cost increases. Further, in order to prevent the flare nut from loosening, it is necessary to tighten the flare nut to the metal fitting body with great force, which causes a problem in that workability during attachment and detachment deteriorates.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a joint fitting that can be manufactured at low cost and has good workability for attachment and detachment.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a main body having a threaded portion into which a flare nut is screwed and a through hole formed therein, and a metal tube that extends over the entire outer periphery of the metal tube. The connecting body includes a press-fitting part covered with an elastic body and press-fitted into the through hole by the elastic body, and a connecting body formed with a sheet part that comes into pressure contact with a flare formed on the pipe body to be connected. be.

(Function) The joint fitting according to the present invention is assembled by press-fitting the press-fitting part of the connecting body into the through-hole of the main body, and the flare and the seat part are connected by screwing and tightening the flare nut to the threaded part of the main body. Connected by pressure welding. At this time, since the seat part is made of an elastic body, the seat part is compressed and the flare and the seat part are firmly attached.

(Effects of the Invention) As explained above, according to the present invention, even if the seat part is provided at a position eccentric from the center of the bottom surface of the recess, the seat part is compressively deformed toward the center part at the time of connection, resulting in flare. Because they are in close contact with each other, they can be manufactured at low cost by allowing a certain amount of processing error, and because the restoring force of the seat part causes the seat part and flare to come into close contact with each other, the tightening force is lower than before, making it easier to attach and detach. The effect is that the properties can be improved.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings. Figure 1 shows a cross-sectional view of this embodiment, showing the metal fitting body 1.
Three recesses each having a threaded portion 12 formed on its inner circumferential surface are bored in the upper surface and both side surfaces of the recess. Metal fitting body 10
A T-shaped through hole 24 having three ends opening at the center of the bottom surface of the recess 14 is bored inside the recess 14 . This through hole 24 acts as a branch flow path for branching the pressure oil.

A connecting body 26 is press-fitted into each opening of the through hole 24 . The connecting body 26 has a generally truncated conical shape that is coated with a synthetic resin over the entire outer circumferential surface of the metal tube 28, and is pressed against a press-fitting part 30 having a diameter slightly larger than the inner diameter of the through hole 24 and a flare. It is configured by forming a seat portion 32. To coat the outer periphery of the metal tube 28 with synthetic resin,
The press-fitting part 30 and the sheet part 32 may be integrally molded using an injection molding machine so that a hole is formed inside, and the metal tube 28 may be press-fitted into this hole. The portion 32 and the metal tube 28 may be integrally molded.

As in the past, the fittings configured as above include
A flare nut is screwed onto each of the threaded portions 12 and tightened to connect the pipe bodies.

As explained above, according to this embodiment, the synthetic resin press-fit part is interposed between the fitting body and the metal tube in a compressed state, so that the press-fitting part and the press-fitting part are connected to each other. It is possible to prevent oil leakage by making close contact with the metal pipe. In addition, since the synthetic resin seat part is compressed and deformed by the flare during connection, the flare and the seat part are in close contact with each other, and even if the seat part is eccentric, a gap is created between the flare and the seat part. Never. Furthermore, since the metal tube is provided inside the seat, the flow path will not be closed due to compressive deformation of the seat.

Although an example in which the seat portion and the press-fit portion are made of synthetic resin has been described above, they may also be made of an elastic body such as oil-resistant rubber.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a part of a conventional joint fitting. 12, Threaded portion 24, Through hole 26, Connection body 30, Press-fit portion 32, Seat portion

Claims (1)

[Claims] a main body including a threaded portion into which a flare nut is screwed and a through hole formed therein; a press-fit portion in which an elastic body is coated over the entire outer periphery of a metal tube and is press-fitted into the through hole by the elastic body; A joint fitting comprising: a connecting body formed with a sheet portion that is pressed into contact with a flare formed on a pipe body to be connected.