JP2000039001A - Fastening structure between tank and hose thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank to provide an excellent sealing effect between a lead-in pipe or a lead-out pipe and a hose even when a recessed part is formed due to shrinkage occurring during molding. SOLUTION: A seal part 51 is arranged at the tip part of the peripheral surface of a lead-in pipe 3 and a read-out 5, and since by forming the largest part of the seal part 51 as an equal diameter part 51b having a proper length and an uniform outside diameter, contact between the lead-in pipe 3 or the lead-out pipe 5 and a hose is formed in a surface contact state, even when a recessed part depends on the equal diameter part 51b, a flow passage for hydraulic is not formed between the lead-in pipe 3 or the lead-out pipe 5 and the hose, and an excellent sealing effect is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank and its fastening structure with a hose, and more particularly, to a tank and a hose having a seal provided at a connecting portion for connecting a hose to a pipe so as to prevent leakage of liquid. Related to a fastening structure.

[0002]

2. Description of the Related Art As an oil tank (reservoir tank) used in a hydraulic power steering device of an automobile or the like, an oil tank provided with an inlet pipe and an outlet pipe for pipe connection and made of synthetic resin which is integrally molded is often used. Used.

In such a tank, the hydraulic oil outlet of the hydraulic actuator and the inlet pipe are connected by a hose, and the hydraulic oil inlet of the hydraulic actuator and the hydraulic oil discharge port of the hydraulic pump are connected. By connecting the hydraulic oil suction port of the pump and the outlet pipe with a hose, the hydraulic oil discharged from the hydraulic actuator is introduced from the introduction pipe to operate the hydraulic actuator, and the hydraulic oil sucked into the hydraulic pump From the outlet pipe to circulate the hydraulic oil. A seal is provided between the inlet and outlet pipes and the hose to prevent oil leakage.

FIG. 6 is a front view showing a configuration of a main part of a tank of a conventional hydraulic power steering device. In the figure, reference numeral 4 denotes a cylindrical main body made of a synthetic resin. An introduction pipe 3 through which hydraulic oil returning from a hydraulic actuator (not shown) flows is formed integrally with a lower part of a peripheral surface of the main body part 4, and a hydraulic pump (not shown) is provided on a bottom surface of the main body part 4. ) Are formed integrally with the outlet pipe 5 through which the hydraulic oil sucked into the pipe flows.

FIG. 7 is a partially enlarged front sectional view showing a configuration of a main part of the outlet pipe 5. As shown in FIG. In order to prevent oil leakage between the leading end of the outlet pipe 5 and the hose 6 to be connected,
A taper 51 tapering toward the tube tip is formed throughout. Further, since the root portion of the taper 51 has an outer diameter larger than the outer diameter of the pipe, the outlet pipe 5 and the taper 5
A step portion is formed at a portion where 1 is connected.

The distal end of the introduction pipe 3 has the same shape as the distal end of the discharge pipe 5. In such a tank, the inlet pipe 3 or the outlet pipe 5 is inserted from the end of the hose 6,
The hose 6 and the inlet pipe 3 or the outlet pipe 5 are prevented from coming off by the clamp 7 on the root side from the taper 51.
Connection is made.

[0007]

In the conventional tank as described above, in the connection between the inlet pipe 3 and the outlet pipe 5 and the hose 6, the portion where the sealing effect is obtained is the portion of the maximum diameter of the taper 51 and the inner surface of the hose. Are in contact with each other, and a sealing effect is obtained by line contact.

However, since the shape of the tank is complicated, it partially shrinks at the time of molding, and in general, reinforcing fibers are added to the material of the tank in order to increase the strength. Since the included portion has the property of not easily causing the shrinkage, a dent is generated in a portion that is in line contact with the tapered hose, and there is a possibility that oil leakage may occur due to partial passage of hydraulic oil.

Further, since the material of the tank is generally a crystalline resin such as polyamide or polypropylene, dimensional shrinkage occurs due to heat history, and the interference of the inlet tube or outlet tube with the hose decreases, causing oil leakage. There was a fear.
The present invention has been made in view of such circumstances, and when a partial shrinkage occurs during molding, or even when a dimensional shrinkage due to heat history occurs, a tank in which liquid leakage hardly occurs and An object of the present invention is to provide a structure for fastening the hose.

[0010]

A tank according to a first aspect of the present invention is provided with a main body for storing a liquid and protruding from the main body so as to communicate with the main body. In a tank provided with a pipe that seals the inner surface of the hose to be connected by the seal part, the seal part has a uniform outer diameter in a predetermined length range in the pipe axis direction. Features. According to the tank according to the first aspect of the invention, the sealing effect is obtained in a range where the sealing portion has a uniform outer diameter having a predetermined length in the tube axis direction.
Since the hose and the pipe are in surface contact, it is possible to prevent the passage of the liquid even if there is partial shrinkage.

A tank according to a second aspect of the present invention includes a main body for storing a liquid and a seal protruding from the main body and formed over the entire front end of the peripheral surface. And a pipe for sealing an inner surface of a hose to be connected, wherein the seal portion has a circular cross section in the pipe axis direction. According to the tank according to the second aspect of the present invention, since the pipe shaft cross-sectional shape is an arc-shaped seal portion, the inner surface of the hose and the seal portion are in overall surface contact, and the sealing effect is obtained most at the top. However, a sufficient sealing effect can be obtained before and after that, and even if there is partial shrinkage, it is possible to prevent the passage of the liquid from occurring.

A tank according to a third aspect of the present invention is characterized in that a plurality of seal portions are provided in parallel in the pipe axis direction. According to the tank according to the third invention, the contact area between the pipe and the hose increases by arranging the plurality of seal portions in parallel,
Further, it is possible to make it difficult for liquid leakage to occur.

According to a fourth aspect of the present invention, there is provided a fastening structure for connecting a hose and a pipe of a tank according to the third aspect of the present invention. It is characterized by being fastened by a clamp at a position and a position between the seal portions. According to the fastening structure with the hose according to the fourth invention, the fastening is performed at a position closer to the root side than the seal portion at the most root side of the pipe, and at a position between the seal portion and the seal portion,
Since the contact area between the pipe and the hose is increased, it is possible to further prevent the liquid from leaking.

The tank according to a fifth aspect of the present invention is characterized in that a reinforcing tube is inserted inside the tip of the pipe. According to the tank according to the fifth aspect of the invention, by inserting a reinforcing cylinder made of a material having a low heat shrinkage inside the distal end portion of the pipe, it is possible to prevent dimensional shrinkage of the pipe, thereby further preventing liquid leakage. Becomes

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 The present invention will be described below in detail with reference to the drawings showing an embodiment. FIG. 1 is a front view showing a configuration of a main part of a tank according to a first embodiment of the present invention. In the figure, reference numeral 4 denotes a cylindrical main body made of a synthetic resin. An introduction pipe 3 through which hydraulic oil returning from a hydraulic actuator (not shown) flows is formed integrally with a lower part of a peripheral surface of the main body part 4, and a hydraulic pump (not shown) is provided on a bottom surface of the main body part 4. ) Are formed integrally with the outlet pipe 5 through which the hydraulic oil sucked into the pipe flows. The introduction pipe 3 protrudes outward from the main body 4 in a plane perpendicular to the central axis of the main body 4, and the outlet pipe 5 is formed to project obliquely downward from the bottom surface of the main body 4. A short-cylindrical oil filler port having a screw shape formed on the outer peripheral surface is provided on the upper surface of the main body portion 4. The short-cylindrical cap 2 having an upper surface and having a screw shape formed on the inner surface is provided. It is closed by being screwed in.

FIG. 2 is a partially enlarged front view showing the structure of the main part of the outlet pipe 5, and FIG. 3 is a partially enlarged front sectional view showing the structure of the main part of the outlet pipe 5. As shown in FIG. A sealing portion 51 is formed over the entire distal end of the outlet pipe 5. The seal portion 51 is tapered toward the distal end of the pipe, and the thinnest portion at the distal end has an outer diameter equal to the outer diameter of a portion of the outlet pipe 5 closer to the root than the seal portion 51.
1a is connected by the same outer diameter as the thickest part, and is constituted by an equal-diameter portion 51b having a uniform outer diameter and having an appropriate length in the pipe axis direction.

The outlet pipe 5 is inserted into the hose 6 from its distal end to a portion closer to the root side than the equal diameter portion 51b. At a position closer to the root side than the equal diameter portion 51b, an approximately α-shaped hose fastening clamp 7 is used. The outlet pipe 5 and the hose 6 are fastened. The distal end of the introduction pipe 3 has the same shape as the distal end of the outlet pipe 5.

With the above structure, the hose 6 and the equal-diameter portion 51b are brought into close contact with each other by surface contact, so that the concave portion 8 is formed on the surface of the equal-diameter portion 51b due to partial shrinkage during molding of the tank. In this case, there is no passage for the hydraulic oil, and a good sealing effect can be obtained.

Second Embodiment FIG. 4 is a partially enlarged front view showing a configuration of a main part of a lead-out pipe 5 of a tank according to a second embodiment of the present invention, and FIG. It is a partial enlarged front sectional view shown. A seal portion 52a is provided over the entire distal end portion of the peripheral surface of the lead-out tube 5, and a seal portion 52b is provided over the entire peripheral surface at a root-side position appropriately separated therefrom.
The seal portions 52a, 52b are tapered toward the tip of the tube so that the hose can be easily inserted, and are thickest at the center thereof, and narrow at the root side for fastening by the clamp 7. And the thinnest ends are the sealing portions 52a,
It is formed in a form having the same outer diameter as the portion between 52b and the portion on the root side from the seal portion 52b.

A cylindrical reinforcing tube 9 made of metal and having a flange at one end is inserted inside the distal end portion of the lead-out tube 5 with the flange toward the distal end of the tube.

The outlet pipe 5 is inserted into the hose 6 from its distal end to a position closer to the root side than the seal portion 52b, and is substantially α-shaped between the seal portions 52a and 52b and at a position closer to the root side than the seal portion 52b. Clamps for fastening hoses 7,7
Thereby, the outlet pipe 5 and the hose 6 are fastened. In addition, the introduction pipe 3 has the same shape as the extraction pipe 5.

With the above-described configuration, the hose 6 and the seal portions 52a and 52b are in close contact with each other, so that the concave portions 8 are generated on the surfaces of the seal portions 52a and 52b due to partial shrinkage during molding of the tank. Also has no passage for hydraulic oil, and has two seals and two clamps.
Since the contact area between the hose 6 and the outlet pipe 5 is increased by using the individual pieces, a good sealing effect is obtained.

Further, since the reinforcing tube 9 is inserted, the dimensional shrinkage of the tube is suppressed. In the tank of the second embodiment, two seal portions 52a and 52b
However, the root-side seal portion 52b may not be provided. Although the number of the seal portions is one in the first embodiment and two in the second embodiment, the number may be three or more. The surface shape may be an arc shape. In the case where a plurality of seal portions are provided in parallel, only the portion closer to the root than the seal portion closest to the root may be fastened by a clamp.

[0024]

As described above in detail, according to the tank according to the first aspect of the present invention, since the portion having the same diameter of the seal portion comes into surface contact with the hose, even if a concave portion exists on the surface of the seal portion, Liquid leakage hardly occurs.

According to the tank according to the second aspect of the present invention, the pipe section of the seal section has a circular arc shape, and the inner surface of the hose and the seal section are in overall surface contact. Even if a concave portion exists on the surface of the liquid, liquid leakage hardly occurs.

According to the tank according to the third aspect of the present invention, since the contact area between the pipe and the hose is increased by arranging a plurality of seal portions in parallel, it is possible to more effectively prevent the liquid leakage. I do.

According to the hose fastening structure of the fourth aspect of the present invention, since the fastening is performed also between the seal portions, the contact area between the pipe and the hose is increased, and the hose is connected with the hose. Even in the case of creep, since the contact is secured by the fastening force of the clamp, it is possible to prevent the liquid leakage more favorably.

According to the tank according to the fifth aspect of the present invention, a reinforcing cylinder made of a material having a small heat shrinkage rate is inserted into the inside of the pipe, thereby constraining the inner diameter of the pipe and preventing dimensional shrinkage. The present invention has excellent effects, for example, it is possible to prevent liquid leakage.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a main part of a tank according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged front view showing a configuration of a main part of an outlet pipe.

FIG. 3 is a partially enlarged front cross-sectional view showing a configuration of a main part of an outlet pipe.

FIG. 4 is a partially enlarged front view showing a configuration of a main part of an outlet pipe of a tank according to a second embodiment of the present invention.

FIG. 5 is a partially enlarged front sectional view showing a configuration of a main part of an outlet pipe.

FIG. 6 is a front view showing a conventional tank.

FIG. 7 is a partially enlarged front sectional view showing an outlet pipe of a conventional tank.

[Explanation of symbols]

 Reference Signs List 3 Introducing pipe 4 Main body 5 Outgoing pipe 51a Tapered part 51b Equal diameter part 6 Hose 7 Clamp

Claims (5)

[Claims] 1. A hose that is connected by a main body for storing a liquid and a seal protruding from and communicating with the main body and formed over the entire front end of the peripheral surface. A tank having a pipe for sealing an inner surface thereof, wherein the seal portion has a uniform outer diameter in a predetermined length range in the pipe axis direction. 2. A hose which is connected by a main body for storing a liquid and a seal protrudingly connected to the main body and formed over the entire front end of the peripheral surface. In a tank provided with a tube for sealing an inner surface, the seal portion has an arc-shaped cross section in the tube axis direction. 3. The tank according to claim 1, wherein a plurality of seal portions are provided in parallel in the pipe axis direction. 4. The fastening structure between a pipe and a hose of a tank according to claim 3, wherein the pipe and the hose are located at a position closer to the root than the seal at the root of the pipe, and the seal and the seal are connected to each other. Characterized in that it is fastened by a clamp at a position between the hoses. 5. The tank according to claim 1, wherein a reinforcing cylinder is inserted inside a distal end portion of the pipe.