JPH0712684U - Resin tube with reinforcing collar - Google Patents

Abstract

(57) [Abstract] [Purpose] In a resin tube with a reinforcing collar, which is composed of a synthetic resin tube main body and a reinforcing collar that is fitted into the opening of the tube main body to prevent deformation of the opening, Even if the inner diameter of the opening of the tube main body varies, the reinforcing collar can be properly inserted and the reinforcing collar does not easily fall out of the tube main body. [Structure] In a resin tube 12 composed of a synthetic resin tube body 14 and a reinforcing collar 16 fitted in an opening of the tube body to prevent deformation of the opening, the reinforcing collar is The slit 22 formed in the cylindrical wall portion and extending substantially in the axial direction enables expansion and contraction of the diameter, and is attached to the opening of the tube body by a spring action generated in the radial direction.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention relates to a resin tube with a reinforcing collar, and in particular, for a resin tube with a large variation in wall thickness such as a blow molded tube and a large variation in inner diameter, a technology to easily attach a reinforcing collar to the opening. It is about.

[0002]

[Background technology]

 Conventionally, tubes made of various materials such as metal, synthetic resin, and rubber have been used to form a flow passage for allowing fluids such as various liquids and gases to flow. In order to reduce the weight, synthetic resin tubes are preferably used. Also, for synthetic resin tubes, there is known a resin tube with a structure in which a reinforcing collar is fitted in the end opening so that the tube can be prevented from being deformed when a rubber hose or the like is connected to the end. There is.

More specifically, FIG. 7 shows a resin tube 2 with a reinforcing collar used for an intake system pipe for a vehicle and the like, with a rubber hose 8 connected to its end. The resin tube 2 is composed of a tube body 4 which is a resin blow-molded product and a reinforcing collar 6 made of a steel pipe having a ring shape, and the reinforcing collar 6 is fitted with a rubber hose of the tube body 4. It is press-fitted and fixed in the end opening that becomes the part. Due to the presence of the reinforcing collar 6, even if the rubber hose 8 is connected to the end portion of the resin tube 2 and is fastened with the clamp 10 to prevent the resin tube 2 from coming off, the deformation of the tube can be effectively prevented. As a result, the air flow rate can be secured in a stable manner.

By the way, in such a resin tube with a reinforcing collar, the inner diameter of the tube body is different from that of the reinforcing collar so that the reinforcing collar press-fitted into the opening of the tube body does not easily come out of the tube body. It is required to be 0.1 mm to 0.3 mm smaller than the outer diameter. However, resin tubes, especially blow-molded tubes, have a large variation in wall thickness and a large variation in inner diameter, so this deviation often deviates from this tolerance. Therefore, conventionally, the inner surface of the tube is cut so as to be within the above-mentioned tolerance range according to the outer diameter of the reinforcing collar.

However, in practice, the cutting diameter often deviates from the above-mentioned tolerance, and when the cutting diameter is too large, the reinforcing collar easily comes off. If the diameter was too small, there was a problem that the reinforcing collar could not be press-fitted. The reasons why the cutting diameter deviates from the tolerance are, for example, (a) that the variation of the outer diameter of the cutting blade (including the equipment installation error of the cutting blade) is about 0.3 mm, and For example, the position of the set may shift when setting the ingredients. There is also the problem that the cutting diameter becomes smaller due to wear of the cutting blade, but in order to prevent this, the cutting blade must be replaced early, and the life of the cutting blade will be greatly shortened. Invite.

Further, even when the cutting diameter falls within the above tolerance, there is a problem that the resin tube body is easily deformed, and it is difficult to control the accuracy of the inner diameter dimension. Since the diametrical size also varies (about 0.2 mm), these problems may also cause the tube body and the reinforcing collar to come off or be unable to be press-fitted.

[0007]

[Solution]

 The present invention has been made in view of such circumstances, and the problem to be solved is to solve the problem that the reinforcing collar can be used even if the inner diameter of the opening of the tube body into which the reinforcing collar is inserted varies. Is to be fitted well and to prevent falling out.

[0008]

[Solution]

 In order to solve such a problem, the gist of the present invention is to provide a synthetic resin tube main body and a reinforcing collar that is fitted into the opening of the tube main body to prevent deformation of the opening. The reinforcing collar is made of a resin tube, and the reinforcing collar can be expanded and contracted by a slit formed in the cylindrical wall portion thereof extending in the substantially axial direction, and by a spring action generated in the radial direction. A resin tube with a reinforcing collar, which is attached to the opening of the tube body.

[0009]

[Action / effect]

 In short, in the present invention, since the reinforcing collar attached to the tube body can be expanded and contracted in diameter by the slit formed in the tube wall portion, such expansion and contraction of diameter is possible. Thus, it is possible to favorably absorb the variation in the inner diameter dimension (cutting diameter) of the opening of the tube body. Further, in such a reinforcing collar, since a spring action occurs in the radial direction in the reduced diameter state, by fitting it into the opening of the tube body in the reduced diameter state, it is stably fixed by the spring action, Fallout can be prevented. Therefore, the reinforcing collar can always be favorably fitted into the tube body, and the fitting collar alone prevents the fall-out, so that no adhesive coating is required. Further, since the variation in the inner diameter of the tube main body is allowed to some extent, the wear of the cutting blade is allowed to some extent, and the life of the cutting blade can be advantageously extended. Of.

[0010]

【Example】

 Hereinafter, in order to clarify the present invention more specifically, representative embodiments of the present invention will be described in detail with reference to the drawings.

First, in FIGS. 1 and 2, a resin tube 12 with a reinforcing collar, which is one example of the present invention, used for an intake system piping for a vehicle, and a rubber hose 18 is connected to an end thereof, Further, it is shown in a state where it is fastened by the clamp 20. The resin tube 12 is composed of a synthetic resin tube body 14 having a cylindrical shape, and a substantially ring-shaped reinforcing collar 16 fitted in an opening of the tube body 14.

By the way, the tube body 14 can be formed by various known molding methods, but a blow molded product is usually used. In the as-molded state, the variation in wall thickness is large and the variation in inner diameter is also large. Therefore, in such a tube body 14, before the reinforcing collar 16 is fitted, the opening The inner surface is cut so that the inner diameter is less than the outer diameter of the reinforcing collar 16. It is processed so that it becomes smaller by about 1 mm to 0.3 mm.

On the other hand, as shown in FIG. 3, the reinforcing collar 16 has a slit 22 (slit width: A) extending in the axial direction on the cylindrical wall portion thereof. The slit 22 allows the reinforcing collar 16 to be expanded and contracted in diameter, and has a spring action in the radial direction in the contracted state. Such a reinforcing collar 16 may be formed by, for example, cutting a tubular wall portion of a ring-shaped steel pipe in an axial direction to provide a slit 22 or pressing a steel plate into a cylindrical shape by bending the steel plate. The slit 22 can be formed by leaving a gap at the abutting portion of the above.

When the reinforcing collar 16 is fitted into the opening of the tube body 14, as shown in FIG. 4, the slit 22 is once pushed to the slit width: B to expand the reinforcing collar 16. 16 is expanded and deformed. The reinforcing color 16 thus deformed is again reduced in diameter to the state (slit width: A) of FIG. 3 and fitted into the opening of the tube body 14 (see FIG. 5).

Thus, as shown in FIG. 6, a resin tube 12 with a reinforcing collar is obtained, and in such a resin tube, the reinforcing collar 16 returns to the state (slit width: B) of FIG. Since the spring action tries to fix it in the opening of the tube body 14, even if the inner diameter (cutting diameter) of the tube body 14 deviates from the tolerance and becomes a little larger, the reinforcing collar 16 does not come off. It is well prevented. Then, by simply inserting the reinforcing collar 16 into the tube body 14, it can be prevented from falling off and can be stably attached, so that it is not necessary to apply an adhesive.

Further, as shown in FIG. 6, the inner diameter dimension (cutting diameter) of the tube body 14 is adjusted so that the slit 22 has some clearance when the reinforcing collar 16 is fixed in the tube body 14. By setting in advance, even when the inner diameter dimension (cutting diameter) of the tube body 14 deviates from the tolerance and becomes a little smaller, the slit 22 can absorb it, so that the reinforcing collar 16 is It can always be fitted into the tube body 14.

By the way, when the reinforcing collar 16 having the slit 22 having the outer diameter of 51 mm and the slit width of 2 mm is used, the gap of the slit 22 is fixed in the state where the reinforcing collar 16 is fixed in the tube body 14. The cutting diameter may be set to 51 mm and the inner surface of the opening of the tube body 14 may be cut so that it remains 2 mm. When the reinforcing color 16 is fitted into the opening of the tube body 14, the slit 22 is once expanded until the slit width becomes 10 to 15 mm, and the reinforcing collar 16 is expanded and deformed. After that, the diameter is again reduced to the original state (slit width: 2 mm), and the tube body 14 is fitted into the opening. As a result, the reinforcing collar 16 is fixed in the opening of the tube body 14 by the spring action generated in the radial direction, and cannot be easily pulled out.

Since the variation in the inner diameter of the tube body 14 is allowed to some extent in this way, the cutting blade is allowed to wear to some extent, and the life of the cutting blade can be advantageously extended.

Although one embodiment of the present invention has been described in detail above, it goes without saying that the present invention is not subject to any restrictions due to the description of the above embodiment. In addition to the above embodiments, the present invention may be modified, modified, improved, etc. based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Should be understood,

For example, in the above-mentioned embodiment, the resin tube with the reinforcing collar used for the intake pipe for the vehicle has been described, but it goes without saying that the present invention can be applied to various pipes having similar uses. By the way. However, when a strong axial load is applied, the reinforcing collar may fall off, which is not suitable.

Further, the slit of the reinforcing collar does not necessarily need to be formed so as to extend in the axial direction, and may be formed in a state of being inclined at a predetermined angle with respect to the axial direction.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an example of a resin tube with a reinforcing collar according to the present invention.

FIG. 2 is a sectional view showing a section taken along line II-II in FIG.

FIG. 3 is a perspective view showing an example of a reinforcing collar.

FIG. 4 is a perspective view showing a state in which the reinforcing collar of FIG. 3 is expanded and deformed.

FIG. 5 is an explanatory view showing a state in which the reinforcing collar is fitted into the tube body.

FIG. 6 is an explanatory view showing a state in which a reinforcing collar is fitted in the tube body.

FIG. 7 is a cross-sectional explanatory view showing an example of a conventional resin tube with a reinforcing collar.

[Explanation of symbols]

 12 Resin tube with reinforcing collar 14 Tube body 16 Reinforcing collar 18 Rubber hose 20 Clamp 22 Slit

Claims (1)

[Scope of utility model registration request] 1. A resin tube comprising a synthetic resin tube body and a reinforcing collar fitted into the opening of the tube body to prevent deformation of the opening, wherein the reinforcing collar is , A slit formed in the cylindrical wall portion extending in the substantially axial direction enables expansion and contraction of the diameter,
A resin tube with a reinforcing collar, which is attached to the opening of the tube body by a spring action generated in the radial direction.