JPH0222552Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement of a hose joint used for piping of fluid utilization equipment such as a car air conditioner.

[Conventional technology]

Figure 1 shows a typical hose joint of this type that has been used in the past. It is made of tube material and has a plurality of annular grooves 1b' on the outer periphery of the hose joint, and the tip is threaded onto the equipment pipe. It consists of an inner cylinder 1' equipped with a cap nut 4' to be fitted, and an outer cylinder 2' whose collar 2a' at one end is caulked to the inner cylinder 1'. The end of the hose 3' is inserted into the annular gap between the two, and the outer cylinder 2' is crimped and deformed in the axial direction using an appropriate jig. A caulked portion 2b' is formed to fixedly connect the hose 3' to the inner cylinder 1' to prevent it from coming off due to internal pressure during use and to prevent fluid leakage.

[Problem that the invention attempts to solve]

As described above, all conventional technologies have a structure in which the outer cylinder 2' is deformed by caulking on the annular groove 1b' of the inner cylinder 1', so the outer cylinder 2' tends to deform too much. In order to prevent deformation of the inner cylinder 1', a strong steel pipe has been mainly used for the inner cylinder 1', but as car bodies have become lighter and more compact in recent years, hose joints have also become lighter. ization is required. Therefore, aluminum or a light alloy is used as the tube material for the inner tube, but for strength reasons, the wall thickness must be larger than that of steel pipes.The inner diameter is kept constant depending on the capacity of the equipment, and the outer diameter is In addition, since the outer cylinder has to be made larger, the result is not suitable for weight reduction and compactness.

In addition, the recent trend is that the temperature inside the engine compartment has become higher as the output of the engine has increased, and compressors have become smaller and more pressurized due to the desire to reduce the weight of car bodies and improve cooling capacity. be placed. Under such high temperature and high pressure conditions, in the conventional technique, the portion of the hose located at the caulked portion 2b' of the outer cylinder 2' is greatly distorted, and the portion of the annular groove 1b' closest to the outer cylinder opening 5' is distorted as described above. The inner surface of the hose is likely to crack as it is subjected to repeated axial tension and circumferential expansion due to high pressure while being subjected to vibration at high temperatures. Also, inner cylinder 1'
Since the right end of the tube is simply tapered from the outer peripheral surface, which is approximately equal to the inner diameter of the hose, there is a drawback that the hose can easily slip out from between the inner and outer tubes.

Furthermore, in order to increase the effectiveness of vibration absorption, hose joints are required to be shortened. In other words, in a car air conditioner, hoses connect components such as a compressor, condenser, and evaporator, and since the compressor is attached to the engine itself, which serves as a power source, the hose joints are subject to considerable vibration. For this reason, rubber hoses are used because they are advantageous in absorbing vibrations, and the longer the length of a rubber hose, the more effective it is at absorbing vibrations. However, the space in the engine compartment of a vehicle is small, and various devices are housed together. Therefore, the rubber hoses have to be arranged between each device, and it is quite difficult to increase the length of the rubber hoses. Therefore, there is a demand for the possibility of shortening the hose connection part of the hose joint in order to lengthen the rubber hose part even a little. However, in the above-mentioned conventional technology, it is considered difficult to shorten the hose connection part because it weakens the bonding force of the hose to the joint part.

The purpose of this invention was to reduce the weight of the hose joint without increasing the wall thickness of the inner cylinder, so that there would be no leakage or tearing of the rubber hose under high temperature and high pressure. , to provide a hose joint with a short hose connection.

[Means for solving problems]

As a means to solve the above-mentioned problems, the present invention provides a hose joint where the end of the hose is inserted between the inner cylinder and the outer cylinder for a fixed connection, and both the inner cylinder 1 and the outer cylinder 2 are made of aluminum or light alloy. using the above inner cylinder 1
There are three annular grooves 1b at the required intervals on the outer periphery of the main body part 1a, and following the annular grooves 1b on the rear end side, a flat inner cylinder surface part 1c and a groove slightly smaller than the outer diameter of the inner cylinder main part 1a. A protrusion 11 having a large-diameter inner end 11a and a slope 11c tapering backward is formed by plastic working, and the outer cylinder 2 is deformed by waving at two locations, and the outer cylinder 2 is deformed by waving at two locations. Caulking part 2
b is located on the annular groove 1b in the middle of the inner cylinder main body part 1a, and is formed to be wider than the annular groove 1b, and the outer cylinder surface from the caulked part 2b to the brim part is a slope that gently expands outward. 2d, the caulking part 2c on the rear end side of the outer cylinder is narrower than the caulking part 2b, and the caulking effect is on the inner cylinder surface part 1c and the rear part of the annular groove 1b on the rear end side of the inner cylinder and the protrusion. 11
The hose 3 is connected to the inner end 11a of the hose 3.

[Effect]

The present invention has the above configuration, and the caulking part 2b
is located above the middle annular groove 1b and is formed to be wider than the annular groove 1b, so the rubber hose is tied above the groove of the annular groove 1b and at the upper corners of both the front and rear corners of the groove. In particular, the tightening is strengthened at the upper corners of the grooves, and a large crimping surface with a large crimping effect can be formed.

Furthermore, since the outer cylindrical surface from the caulking part 2b to the brim part has a slope 2d that gradually expands outward, the escape of the rubber material toward the brim side due to the crimping of the caulking part 2b is supplemented, and the rubber material is pressed against the brim part, and the void is closed. The hose can be brought into close contact with the inner and outer cylinder peripheral wall surfaces including the collar side annular groove 1b.

On the other hand, the caulking part 2c on the rear end side of the outer cylinder is made narrower in width than the caulking part 2b, and the caulking effect is on the inner cylinder surface part 1c and the rear part of the annular groove 1b on the rear end side of the inner cylinder and the inner end of the protrusion part 11. Since the hose is provided so as to cover the portion 11a, the hose is tightened from the large-diameter inner end portion 11a to the flat portion 2c, and a fist-shaped enlarged portion is formed on the annular groove 2b on the rear end side. Therefore, when you put your hand inside the pot and squeeze it, you can get a hooking effect that makes it difficult to pull out.

The width of the caulking part 2c does not need to be as wide as the caulking part 2b, since it just has to play the same role as the neck of the vase. In addition, the inner end 11a with a large diameter has a caulking effect.
Therefore, even if the amount of caulking is small, a sufficient catching effect can be obtained.

In addition, since the annular grooves and protrusions of the inner cylinder are formed by plastic processing, there is less risk of loss of strength compared to forming by cutting, and the corners are smooth and soft against the hose, preventing tube cuts. can.

〔Example〕

Embodiments of this invention will be described below with reference to the drawings.

Figure 2 shows the state before the hoses are connected, and 1 is an inner cylinder made of aluminum or light alloy tube material, the outer diameter of which is l, _{and 1} is the inner diameter of the hose 3 (Figure 3). A nut member 4 is rotatably attached to the tip (the left end in the figure) to be screwed into a pipe on the side of equipment such as a compressor, and the nut member 4 is rotatably attached to the tip (left end in the figure). Three annular grooves 1b are formed at required intervals on the outer periphery of the cylinder main body part 1a by plastic working, and a conical protrusion part is formed at the rear end following the flat inner cylinder surface part 1c. 11 is formed. And the protrusion part 1
The outer diameter _l3 of the rear end 11b of the projection 11 is made equal to or slightly smaller than the diameter d of the hose 3 to facilitate insertion of the hose 3, while the inner end 11 of the protrusion 11
The outer diameter l ₂ of a is larger than the outer diameter l ₁ of the inner cylinder 1, and its width S is at least 1 mm or more, and the distance between the rear end 11b and the inner end 11a with the maximum outer diameter is 10° or less. It forms a slope 11c with an angle α.

The inner cylinder 1 is provided on the outside of the main body 1a of the inner cylinder 1.
A cup-shaped outer cylinder 2 made of the same material and having an inner diameter matching the outer diameter of the hose is fitted concentrically, and the thick flange 2a at the tip is connected to the proximal end of the inner cylinder main body 1a, that is, on the side of the cap nut 4. It is caulked and fixed to the fitting groove 1d provided at the position. Inner cylinder main body part 1a
After fitting the end of the rubber hose 3 into the outer cylinder 2, the outer cylinder 2 is secured to the flat surface part 1c adjacent to the protrusion 11 at the rear end of the inner cylinder and the annular groove in the center using a required tightening jig (not shown). 1b is crimped and deformed in the axial direction at two locations on the outer side, and the crimped portions 2b and 2c are
form. The axial length t of the caulked portion 2b on the brim side is 1.5 to 1.5 of the width of the annular groove 1b on the inner side.
2.0 times, and a slope 2d is formed which is inclined outwardly at a gentle angle of approximately 15 degrees from one end of the caulked portion 2b toward the collar portion 2a.

The caulking part 2c on the rear end side of the outer cylinder is caulked on the flat part 2c, and its width is narrower than the width of the caulking part 2b, and the caulking effect extends to the rear of the annular groove 1b on the rear end side of the inner cylinder, The other end extends to the inner end 11a of the protrusion 11.

Therefore, the outer diameter l ₂ of the protrusion inner end 11a of the inner cylinder 1
In view of the above functions and ease of insertion of the rubber hose 3, it is preferable to set it within 1.15 times the inner diameter d of the rubber hose.

In addition, a conical slope 1 formed on the protrusion 11
1c gently buffers the distortion of the hose 3 that occurs toward the opening of the outer cylinder by deforming the outer cylinder 2 in a wave-like manner, and considering this effect and the economical length of the joint, Preferably, the angle is between 7° and 10°.

The protrusions 11 on the inner cylinder main body 1a are formed by expansion using a tube expander, and the annular grooves 1b are formed by rolling.

〔effect〕

As described above, the present invention has a caulking part 2b on the brim side.
between the annular groove 1b and the intermediate annular groove 1b, the upper corner of the groove is used to tighten the hose, and a wide crimping surface with a large crimping effect is formed in the middle of the hose connection. The external force and pressure applied to the hose on the cylinder opening side can be prevented from being applied to the front flange side as much as possible.

On the front side of the flange, the hose tip is pressed against the flange to eliminate any gaps and can be brought into close contact with the inner and outer peripheral wall surfaces, thereby preventing Freon gas from leaking. In addition, on the rear inner cylinder opening side, the catching effect of the fist corresponds to the pulling force of the hose, and the amount of crimping can be reduced, so the hose is not overly crimped, and therefore, it is easy to handle under high temperature and high pressure. The hose can withstand vibration, expansion, and stress concentration well, reducing the risk of tearing and damage.

Furthermore, in this invention, both the inner and outer cylinders are made of aluminum or light metal, the amount of crimping of the hose is reduced, and the wall thickness of the inner cylinder does not need to be increased. Since the length of the hose joint is shortened, the weight of the joint can be reduced.

Furthermore, since the hose connection part can be shortened and the hose part can be made longer, the vibration absorption effect of the hose can be increased, which is extremely effective in reducing the amount of caulking mentioned above. .

In addition, in the present invention, the entire surface of the inner cylinder is formed by plastic processing, so the inner cylinder surface is smoother than that formed by cutting, and the movement of the inner rubber of the hose 3 is smooth when the outer cylinder 2 is deformed into a wave shape, resulting in stable performance. products, and productivity is improved.

[Brief explanation of drawings]

Figure 1 is a half-sectional side view of a conventional hose joint.
FIG. 2 is a cross-sectional view of the joint of this invention before the hoses are connected, and FIG. 3 is a cross-sectional view of the joint section with the hoses connected. In the figure, 1...Inner cylinder, 1a...Inner cylinder main body, 1b
...Annular groove, 1c...Inner cylinder surface portion, 2...Outer cylinder, 2a...Brim portion, 2b, 2c...Clinching portion,
2d...Slope, 3...Hose, 11...Protrusion,
11a...inner end, 11b...rear end, 11c...
slope.

Claims (1)

[Scope of utility model registration request] It consists of an inner cylinder with a threaded member at the tip, and a pot-shaped outer cylinder with a larger inner diameter and concentrically fixed to the inner cylinder at the brim at one end, and the hose end is inserted into the annular gap formed between the two. In the case where the hose is fixedly connected to the inner cylinder by fitting and inserting the parts and deforming the outer cylinder in the axial direction, both the inner cylinder 1 and the outer cylinder 2 are made of aluminum or a light alloy material, and the main body part of the inner cylinder 1 is There are three annular grooves 1b at the required intervals on the outer circumference of the cylinder 1a, and following the annular grooves 1b on the rear end side, a flat inner cylinder surface part 1c and a groove with a diameter slightly larger than the outer diameter of the inner cylinder main body part 1a. The inner end portion 11a and the protruding portion 11 having a rearwardly tapered slope 11c are formed by plastic working, and the outer cylinder 2 is deformed by waving at two locations, thereby forming the caulking portion 2b on the brim side. is located on the annular groove 1b in the middle of the inner cylinder main body part 1a, and is formed to be wider than the annular groove 1b, and the outer cylinder surface from the caulked part 2b to the brim part has a slope 2d that gradually expands outward. The caulking part 2c on the rear end side of the outer cylinder is narrower than the caulking part 2b, and the caulking effect is on the inner cylinder surface part 1c and the rear part of the annular groove 1b on the rear end side of the inner cylinder and the protrusion 11. 2. A hose joint portion, characterized in that the hose joint portion is provided so as to span the inner end portion 11a of the hose 3 and is connected to the hose 3.