JP2010096322A - Hose connecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose connecting device positively preventing loosening of a hose with respect to a tube by a simple configuration by using only a hose clamp. <P>SOLUTION: An outer circumference of the hose 12 is pressurized to connect the hose to the tube 11 by using the hose clamp 13 having a circular clamp body 21 increased and reduced in a diameter. An engaging part 11d is provided in the tube, and a loosening prevention part 31 engaging with an end of the engaging part to prevent loosening of the hose with respect to the tube is provided in the hose. The loosening prevention part 31 is composed such that it becomes unengaged with the engaging part in a diameter increased state of the clamp body, and it is engaged with the engaging part in a diameter reduced state of the clamp body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hose connection device that connects a hose to a tube using a clamp.

  In general, a hydraulic power steering device for an automobile is provided with a rubber return hose that returns oil discharged from a power cylinder to a reserve tank. One end of the return hose is inserted into a metal tube, and the outer periphery of the return hose is clamped by a hose clamp comprising a clamp, and one end of the return hose is fixed to the tube.

  As described in Patent Document 1, for example, the hose clamp includes a tightening ring portion 1 having an annular shape whose diameter can be expanded and contracted, and a pair of knob pieces 2 and 3. When the hose clamp is attached to the hose H, the pair of knob pieces 2 and 3 are held in a state where the diameter of the tightening ring portion 1 is expanded by the holder 4, and the hose clamp is held at one end of the hose H in this state. And one end of the hose H is inserted into the tube (pipe P). Thereafter, the diameter of the tightening ring portion 1 held by the holder 4 is released to reduce the diameter of the tightening ring portion 1 by its own elastic restoring force, and the hose H is clamped to fix the hose H to the tube. . According to this type of hose connection device, there is an advantage that the hose can be easily and quickly connected to the tube at a site such as a vehicle assembly factory.

  By the way, in the above-described hose connection device, since the hose is prevented from being detached from the pipe by the frictional resistance generated between the hose and the tube, the engine is particularly used when the hose connection device is used in a cold region. When it is repeatedly applied or cut off, pressure is generated in the hose, and when a pressure exceeding the frictional resistance generated between the hose and the tube is generated, a phenomenon that the hose easily comes off from the tube occurs. This is because if the engine is repeatedly turned on and off in a cold region, the fluidity of the oil in the hose with low heat dissipation is reduced due to the temperature difference between the hose and the tube with different heat dissipation. This is because a high surge pressure is generated in the hose when the flow is hindered by oil having poor fluidity.

In order to cope with such a problem, even if pressure is generated in the hose, for example, what is described in Patent Document 2 is known as one that can improve the pulling force of the hose with respect to the tube. It has been.
Japanese Utility Model Publication No. 5-79176 JP 2007-187307 A

  However, in the hose connection device described in Patent Document 2, the pulling force of the hose with respect to the tube can be improved. It is necessary to provide the tool 103. For this reason, the structure of the hose connection device becomes complicated, and the hose connection work becomes complicated.

  The present invention has been made to solve the above-described conventional problems, and provides a hose connection device that can reliably prevent the hose from coming off the tube with a simple configuration using only a hose clamp. It is for the purpose.

  In order to solve the above-described problem, the invention according to claim 1 is characterized in that an outer periphery of the hose is formed by using a hose clamp having an annular clamp body in which one end of a hose is inserted into a tube and the diameter can be expanded and contracted. A hose connection device for tightly connecting the hose to the tube, wherein the tube is provided with an engaging portion, and the hose is engaged with an end portion of the engaging portion to remove the hose from the tube. A retaining portion is provided to prevent the retaining portion from engaging with the engaging portion when the diameter of the clamp body is expanded, and to the engaging portion when the diameter of the clamp body is reduced. It is configured to match.

  The invention according to claim 2 is characterized in that, in claim 1, the hose clamp includes a clamp having an annular clamp body whose diameter can be expanded and contracted, and an outer periphery of the clamp that is integrally overlapped with the clamp. It consists of a backup ring provided.

  According to a third aspect of the present invention, in the first aspect, the hose clamp includes: an annular clamp body whose diameter can be expanded and contracted; and a clamp having the retaining portion formed integrally with the clamp body. It is that.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the retaining portion includes a plurality of claw portions on the circumference bent inward in the radial direction. It is.

  According to the first aspect of the present invention, the retaining portion provided in the hose clamp is disengaged from the engaging portion provided in the tube in the expanded diameter state of the clamp body, and in the reduced diameter state of the clamp body. Since it is configured to engage with the engaging part, it is generated in the hose by attaching the hose clamp with a gap between the hose outer periphery and reducing the diameter of the clamp body. Even if a pulling force acts on the hose due to the pressure applied, the retaining portion engages with the engaging portion of the tube, and the hose can be reliably prevented from coming off the tube. In addition, since the hose can be prevented from coming off the tube with a simple configuration using only the hose clamp, the configuration can be simplified and the hose connection operation can be easily performed.

  According to the invention which concerns on Claim 2, a hose clamp consists of a clamp which has the annular clamp main body which diameter can expand / contract, and the backup ring which overlapped with the outer periphery of the clamp and provided the retaining part. Therefore, the tightening force of the hose clamp can be improved.

  According to the invention according to claim 3, the hose clamp is composed of an annular clamp body whose diameter can be expanded and contracted, and a clamp having a retaining portion formed integrally with the clamp body. Without increasing the number of parts, it is possible to reliably prevent the hose from coming off the tube.

  According to the fourth aspect of the present invention, since the retaining portion is composed of a plurality of claw portions on the circumference that are bent radially inward, the retaining portion can be easily formed by press molding. .

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 3 show the entire hose connection device 10 according to the first embodiment. The hose connection device 10 includes a metal tube 11 constituting a return tube of a hydraulic power steering device, and The rubber hose 12 constituting the return hose and the hose clamp 13 for clamping the tube 11 to one end of the hose 12 are constituted.

  The tube 11 includes, in order from its end, a first straight portion 11a, a bead portion 11b for retaining and sealing, a second straight portion 11c, an engaging flange portion 11d for hose insertion end positioning, and a hexagonal flare nut. A portion 11e is formed. The bead part 11b for retaining and sealing is bulged and formed into a circular arc shape by bead processing. Further, the engaging flange portion 11 d is formed to have substantially the same diameter as the outer diameter of the hose 12.

  The hose 12 has an inner peripheral portion 12 a having an inner diameter slightly smaller than the outer diameter of the first and second straight portions 11 a and 11 c of the tube 11. When the hose 12 is connected to the tube 11, the inner peripheral portion 12 a of the hose 12 extends beyond the bead portion 11 b with respect to the tube 11 until the end surface 12 b of the hose 12 is locked to the engaging flange portion 11 d. In this state, the hose clamp 13 is fitted on the outer peripheral portion of the hose 12 between the bead portion 11b and the engaging flange portion 11d, and the end of the hose 12 is attached to the tube 11 by the tightening force of the hose clamp 13. Clamp.

  As shown in FIG. 5, the hose clamp 13 includes a clamp 20 and a backup ring 30. The clamp 20 is a well-known clamp body 21 made of a metal strip-shaped spring material, and a clamp body 21 wound in an annular shape, and a pair of knobs bent at right angles outward in the radial direction from both ends of the clamp body 21. It has pieces 22 and 23. The clamp 20 has a long hole 24 extending from one end of the clamp body 21 to one knob piece 22, and the other knob piece 23 is inserted into the long hole 24. In the free state, as shown in FIG. 2, the clamp 20 has a pair of knob pieces 22, 23 separated from each other by a spring force, and the diameter of the clamp body 21 is reduced. The inner diameter is set to be smaller than the outer diameter of the hose 12 so that the outer periphery of the hose 12 can be tightened. From this state, the pair of knob pieces 22 and 23 are energized in a direction approaching each other using a dedicated jig or the like, and the pair of knob pieces 22 and 23 are substantially abutted by the holder 25 as shown in FIG. , The clamp body 21 is elastically deformed and held in an enlarged state. In this state, the inner diameter of the clamp body 21 is larger than the outer diameter of the hose 12, and the clamp 20 can be mounted with a clearance from the outer periphery of the hose 12.

  On the outer periphery of the clamp body 21 of the clamp 20, a backup ring 30 is overlaid in a stacked state. The backup ring 30 is made of a strip-shaped spring material having a substantially C-shaped cross section, and always urges the clamp body 21 with an elastic force in a direction in which the diameter is reduced. That is, the backup ring 30 enhances the tightening force (tightening force) in the direction in which the clamp 20 is contracted, and can be elastically integrated with the clamp 20 so as to expand and contract in the radial direction. At one end in the axial direction of the backup ring 30, a plurality of circumferentially retaining claw portions 31 that can be brought into contact with the end face of the engaging flange portion 11 d of the tube 11 are bent inward in the radial direction. The engaging flange portion 11d described above constitutes the engaging portion in the claims, and the above-described retaining pawl portion 31 constitutes the retaining portion in the claims.

  By the way, the plurality of retaining claws 31 can pass through the engagement flange portion 11d of the tube 11 in a state where the clamp body 21 is radially expanded, and the clamp body 21 is radially contracted. Then, it is comprised so that the engagement flange part 11d of the tube 11 may be engaged. That is, as shown in FIG. 2, the virtual circle C <b> 1 inscribed with the plurality of retaining claws 31 is smaller than the diameter of the engaging flange portion 11 d of the tube 11 when the clamp body 21 is radially reduced. As shown in FIG. 4, when the clamp body 21 becomes smaller and engageable and the clamp body 21 is radially expanded, the diameter becomes larger than the diameter of the engagement flange portion 11d of the tube 11 so as to be disengaged. It is configured.

  Since the hose connection device 10 according to the first embodiment of the present invention is configured as described above, when one end of the hose 12 is connected to the tube 11, first, a clamp in which the backup ring 30 is overlaid. As shown in FIG. 4, the pair of 20 knob pieces 22, 23 are held at positions close to each other by a holding tool 25, and in this state, the hose clamp 13 is in a state where there is a gap between one end outer periphery of the hose 12. insert. In this state, the hose 12 is inserted into the tube 11 beyond the bead portion 11b to a position where the end surface 12b of the hose 12 is locked to the engagement flange portion 11d. Thereafter, the hose clamp 13 is adjusted in the longitudinal direction of the hose 12 to a position where the retaining claw portion 31 of the backup ring 30 is engaged with the end face of the engagement flange portion 11 d of the tube 11. In this case, since the clamp main body 21 of the clamp 20 is in the diameter-expanded state, the retaining claw portion 31 of the backup ring 30 can freely pass through the engagement flange portion 11 d of the tube 11. In this state, when the expanded diameter state of the clamp 20 by the holder 25 is released, the clamp 20 and the backup ring 30 are reduced in diameter by the elastic restoring force of the clamp 20 and the backup ring 30, and one end outer periphery of the hose 12 is hung by the hose clamp 13. Tightened and clamped to tube 11. At the same time, as the diameters of the clamp 20 and the backup ring 30 are reduced, the inner diameter positions of the plurality of retaining claws 31 of the backup ring 30 are also reduced. 11d can be engaged.

  Therefore, even if a force in the pulling direction acts on the tube 11 due to the pressure generated in the hose 12, the retaining claw portion 31 of the backup ring 30 acts on the engaging flange portion 11 d of the tube 11. The hose 12 can be reliably prevented from coming out of the tube 11 with respect to the engagement.

  As described above, according to the first embodiment described above, even if a force in the removal direction acts on the hose 12 with respect to the tube 11, the retaining claw portion (retention preventing portion) 31 is engaged with the tube 11. By engaging with the joint flange portion (engagement portion) 11d, it is possible to reliably prevent the hose 12 from coming off the tube 11. Moreover, since the hose 12 can be prevented from coming off from the tube 11 with a simple configuration using only the hose clamp 13, the configuration of the hose connection device 10 can be simplified and the hose connection operation can be easily performed.

  FIG. 6 shows a second embodiment of the present invention. The difference from the first embodiment is that the tube 11 is provided with a retaining claw portion 31 formed on the backup ring 30. Instead of being engaged with the flange portion 11d, the engagement portion 11e1 formed in the flare nut portion 11e is engaged.

  That is, in the second embodiment, in order to position the hose 12 with respect to the tube 11, the bulging portion 11d1 having the same shape as the bead portion 11b is formed in the tube 11 and the flare nut portion 11e is formed. The retaining claw portion 31 is engaged with the joint portion 11e1. Note that components that are basically the same as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 7 shows a third embodiment of the present invention. The difference from the first and second embodiments is that a retaining pawl 131 is integrally formed with the clamp 20. . That is, in the present invention, since the hose 12 can be prevented from coming off the tube 11 by the retaining pawl 131, it is not necessary to increase the tightening force of the clamp 20 (hose clamp 13) more than necessary. The backup ring 30 in the first and second embodiments is eliminated, and the retaining claw 131 is provided directly on the clamp 20. Note that components that are basically the same as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Therefore, according to the third embodiment, by omitting the backup ring 30, the number of parts of the hose clamp 13 can be reduced, and the configuration of the hose connection device 10 can be further simplified.

  In the above-described embodiment, the example in which the hose connection device 10 is used to connect the return hose and the return tube of the hydraulic power steering device has been described. However, the present invention uses a clamp to connect the hose and the tube. It can be applied to all connected fields.

  In the above-described embodiment, the end surface 12b of the hose 12 is brought into contact with the engagement flange portion 11d of the tube 11. However, the hose 12 is inserted into the tube 11 to a predetermined position and engaged. The flange portion 11d can be used only for engagement with the retaining claw portion 31.

  Further, in the above-described embodiment, in order from the end of the tube 11, the first straight portion 11a, the bead portion 11b for retaining and sealing, the second straight portion 11c, and the engaging flange portion for hose insertion end positioning Although the example which formed 11d (or bead-shaped bulging part 11d1) and the flare nut part 11e was described, the shape of the tube 11 is not limited to the thing of embodiment, For example, a 1st straight part It may replace with 11a and may form the taper part which followed the bead part 11b.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited to the configurations described in the embodiments, and does not depart from the gist of the present invention described in the claims. It can take various forms.

It is sectional drawing which shows the hose connection apparatus which concerns on the 1st Embodiment of this invention. FIG. 2 is a view taken along the line 2-2 in FIG. FIG. 3 is an external view of the hose connection device as seen from the direction of arrow 3 in FIG. 2. It is a figure which shows the operation state of FIG. It is a perspective view which shows a hose clamp. It is sectional drawing which shows the hose connection apparatus which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the hose clamp in the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Hose connection apparatus, 11 ... Tube, 11d ... Engagement part (engagement flange part), 12 ... Hose, 13 ... Hose clamp, 20 ... Clamp, 21 ... Clamp body, 30 ... Backup ring, 31, 131 ... Disengagement Stopping part (claw part for retaining).

Claims (4)

A hose connection device for inserting one end of a hose into a tube and using a hose clamp having an annular clamp body whose diameter can be expanded and contracted, and pressing the outer periphery of the hose to connect the hose to the tube,
The tube is provided with an engaging portion, and the hose is provided with a retaining portion for engaging the end portion of the engaging portion to prevent the hose from coming off the tube.
The retaining portion is configured to be disengaged from the engaging portion when the clamp body is in a diameter-enlarged state, and to be engaged with the engaging portion when the diameter of the clamp body is reduced. A hose connection device characterized by that.   2. The hose clamp according to claim 1, wherein the hose clamp includes a clamp having an annular clamp body whose diameter can be expanded and contracted, and a backup ring which is integrally overlapped with an outer periphery of the clamp and provided with the retaining portion. Hose connection device characterized by.   The hose connection according to claim 1, wherein the hose clamp includes an annular clamp body whose diameter can be expanded and contracted, and a clamp having the retaining portion formed integrally with the clamp body. apparatus. 4. The hose connection device according to claim 1, wherein the retaining portion includes a plurality of claw portions on the circumference bent inward in the radial direction. 5.

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