JP2011002046A - Hose clamp structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple hose clamp structure preventing a hose from coming off from piping.SOLUTION: The hose clamp 3 includes a clamp part 31 forming a ring shape in which both end parts cross and having spring elasticity in a direction reducing diameter from an outer diameter of the hose in a free state, and projection pieces 32, 33 projecting in a radial direction on both ends of the clamp part respectively. A hose 2 on which the hose clamp 3 in an expanded diameter state is inserted is inserted on a piping 1 on which a clamp holder 5 is fixed beforehand. At that time, the projection pieces 32, 33 of the hose clamp 3 are made closer, are inserted in a holding hole 53 through an entrance port 54 of the clamp holder 5, and are prevented from coming off in an axial direction by being opened by their own spring force.

Description

  The present invention relates to a hose clamp structure, and more particularly to a structure suitable for clamping an automobile hose.

  For example, rubber hoses are used to connect between a transmission unit and an oil cooler in an oil cooling system for an automobile transmission. In that case, a clamp structure is used in which a rubber hose is inserted into a metal pipe (tube) connected to the transmission unit and the hose insertion portion is tightened with a hose clamp to prevent the hose from falling off. As a hose clamp, one having a clamp portion having a spring elasticity in a ring shape in which both ends intersect and having a diameter reduced from the outer diameter of the hose in a free state is widely used.

  However, if an abnormally high pressure is applied from the inside of the transmission unit, oil adheres to the gap between the hose and the pipe, or the clamp is misplaced, the hose and the clamp are integrated from the pipe due to vibration or the like. There is a possibility of exit.

  In Patent Document 1, in a structure in which a hose and a pipe are fastened by a hose clamp, a plurality of claw portions protruding in the axial direction are provided on the hose clamp, and these claw portions are engaged with a flange protruding from the pipe. Thus, a structure for retaining the hose is disclosed. Further, in Patent Document 2, a supporter fixedly supported on the outer periphery of the piping portion is provided, and after a hose clamp is inserted from one end entrance of the supporter, a stopper is added to the entrance, and a hose is added. A clamp positioning is disclosed.

  In the case of Patent Document 1, the hose clamp includes an inner band and an outer band, and a worm gear or the like is required to slide the outer band with respect to the inner band. Therefore, the structure is more complicated than a general hose clamp. Yes, hose clamp assembly becomes worse. Furthermore, it is necessary to fix the claw portion for engagement with the flange to the hose clamp, and there is a disadvantage that further increases the cost.

  On the other hand, Patent Document 2 requires a supporter, a holder, and a retainer in addition to piping, a hose, and a hose clamp as parts constituting the hose connection device, and has a large number of parts and a complicated structure. There is a disadvantage of becoming high. In addition, it is necessary to previously form a plurality of protrusions in the circumferential direction in the pipe, but such protrusions are not formed in general pipes and require special processing. This results in an increase in cost.

JP-A-3-107692 JP 2008-215602 A

  An object of the present invention is to provide a clamp structure for a hose that has a simple structure and can prevent the hose from coming off the pipe.

  In order to achieve the above object, the present invention provides a hose clamp structure in which a hose is connected to an outer peripheral surface of a piping portion and the hose is fastened by a hose clamp, and the hose clamp has a ring shape in which both ends intersect. In the free state, the clamp part having spring elasticity in the direction of being reduced in diameter from the outer diameter of the hose and the both ends of the clamp part are formed to protrude in the radial direction, and the clamp part is in an expanded state by being close to each other A clamp structure having a projecting piece that can be formed, and having a clamp holder in which one end portion is fixed to the pipe portion and a frame portion surrounding the projecting piece of the hose clamp is formed at the other end portion, A housing hole for accommodating the protruding piece therein and restricting the axial movement of the protruding piece is formed on the inner side of the housing hole. Providing a clamp structure which is characterized in that only passable inlets protruding piece in a state of close together the clamp is provided.

  The present invention is based on the following findings. That is, since the hose clamp is strongly pressure-bonded to the outer peripheral surface of the hose, when the hose is pulled out from the pipe, the hose clamp is always pulled out integrally with the hose. Therefore, if the hose clamp is restricted from moving in the axial direction with respect to the piping portion, the hose can be prevented from coming off as a result. Therefore, in the present invention, when the clamp holder is fixed to the piping portion in advance and the hose is connected to the piping portion, the protruding pieces formed at both ends of the hose clamp are held in an expanded state, and the protruding pieces are clamp holders. Enter the accommodation hole from the entrance. When the clamping force to the protruding piece is released from this state, the hose clamp is reduced in diameter by its own spring elasticity, and the protruding piece opens and is prevented from being removed by the accommodation hole. The entrance hole of the receiving hole can be passed only when the protruding pieces of the hose clamp are close to each other (expanded state), and the protruding piece is open when the hose clamp is fastened (reduced diameter). Even if a tensile force acts, there is no possibility that the hose clamp will come out of the accommodation hole.

  As a method for bringing the protruding piece closer to make the hose clamp in an expanded state, it is desirable to use a clip that holds the protruding piece in the closing direction. When using a clip, it is preferable that the entrance of the clamp holder has a width that allows not only the protruding piece but also the clip to pass through. Insert a hose clamp with a clip through the hose and insert the hose into the pipe. Since the protruding piece of the hose clamp is clamped by the clip, it can easily pass through the entrance of the clamp holder. If the clip is removed after the protruding piece of the hose clamp is inserted into the accommodation hole of the clamp holder, the protruding piece opens and is prevented from coming off at the same time as the diameter of the hose clamp is reduced. In addition, you may clamp a protrusion piece not only using the method of using a clip but tools, such as pliers.

  One end of the clamp holder is fixed to the piping part. As the fixing method, various methods such as brazing, welding, screwing, and adhesion can be used. When the clamp holder is integrally formed of a resin material, it may be bonded to the piping part. By fixing the clamp holder to the pipe part, the heat radiation area of the pipe part is increased, so that there is an effect of increasing the cooling effect of the pipe part.

  As described above, according to the present invention, the clamp holder is fixed to the pipe part in advance, and the hose clamp is closed (expanded state) so that the hose is inserted into the pipe part. After inserting into the receiving hole from the entrance of the clamp holder, releasing the closing force of the protruding piece will reduce the diameter of the hose clamp and open the protruding piece at the same time. I can prevent it. In the present invention, existing products can be used as they are for the hose, piping section, and hose clamp, and only the clamp holder needs to be fixed to the piping section in advance, so that a low-cost clamping structure can be realized.

It is a disassembled perspective view of 1st Embodiment of the clamp structure of the hose which concerns on this invention. It is a perspective view of the hose clamp of a reduced diameter state. It is a front view of the clamp structure shown in FIG. It is a top view of the clamp structure shown in FIG. It is a top view which shows the assembly | attachment direction of the clamp structure shown in FIG. It is a front view of the clamp structure of 2nd Embodiment of this invention. It is a left view of the clamp structure shown in FIG. It is a top view of the clamp structure shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to examples.

[First Embodiment]
1 to 5 show a hose clamp structure according to the first embodiment. The clamp structure includes a pipe 1, a hose 2 connected to the outer periphery of the pipe 1, a hose clamp 3 that fastens the outer periphery of the hose 2, and a clamp holder 5.

  The pipe 1 is constituted by, for example, a metal tube for oil introduction / outflow connected to a transmission unit. A first annular convex portion (spool portion) 11 is formed on the outer peripheral surface in the vicinity of the opening end of the pipe 1, and the clamp holder 5 is fixed at a position away from the first annular convex portion 11 by a predetermined distance. Has been. The outer diameter of the first annular convex portion 11 is larger than the inner diameter of the hose 2, and has a function of suppressing the disconnection of the hose 2 by pressure bonding to the inner surface of the hose 2. Note that the first annular convex portion 11 can be omitted.

  The hose 2 is a hose made of an elastic material such as rubber having an inner diameter that is the same as or slightly smaller than the outer diameter of the pipe 1. The hose 2 is inserted from the opening end of the pipe 1 and is press-fitted until the tip of the hose 2 passes over the first annular projection 11 and hits the clamp holder 5.

  The hose clamp 3 is a known one obtained by press-molding a flat plate made of spring steel. The hose clamp 3 has a ring shape in which both ends intersect each other, and in a free state, the clamp part 31 has spring elasticity in a direction that is reduced in diameter from the outer diameter of the hose 2 and is folded in the radial direction at both ends of the clamp part 31. The projection pieces 32 and 33 are formed in a curved shape. In this example, it is composed of three projecting pieces, ie, a projecting piece 32 at the center and two projecting pieces 33 on both sides thereof, but a structure in which the projecting pieces 33 on both sides are connected to each other may be used. In the free state (diameter-reduced state), as shown in FIG. 2, the protruding piece 32 and the protruding piece 33 intersect and are separated, and the inner diameter D1 of the clamp portion 31 is smaller than the outer diameter of the hose 2. On the other hand, by bringing the protruding piece 32 and the protruding piece 33 closer to each other, the inner diameter D2 of the clamp portion 31 can be made the same as or slightly larger than the outer diameter of the hose 2 as shown in FIG. In order to hold in an expanded state, for example, the clip 4 that holds both protruding pieces 32 and 33 may be used, or both protruding pieces 32 and 33 may be held using a tool such as pliers. The hose clamp 3 in an expanded state (with a clip) is inserted in the hose 2 in advance, the hose 2 is inserted into the pipe 1, and then the clip 4 is removed, whereby the hose 2 is piped by the fastening force of the hose clamp 3. 1 can be crimped.

  The clamp holder 5 is fixed to the pipe 1 in advance as described above, and prevents the hose clamp 3 from coming off. The clamp holder 5 of this embodiment is obtained by overlapping and joining two metal plates. One end of the clamp holder 5 is formed with a curved fixing portion 51 that is brazed to the outer peripheral surface of the pipe 1 and fixed by welding or the like. A flat frame portion 52 parallel to the pipe 1 is formed at the other end portion of the clamp holder 5 extending to the opening end side of the pipe 1, and an accommodation hole 53 is formed inside the frame portion 52. . The fixed portion 51 and the frame portion 52 are connected via a leg portion 55 standing in the radial direction, and the two metal plates are joined by the leg portion 55. In this embodiment, the leg 55 serves as a stopper when the hose 2 is inserted. The distance R1 from the axial center of the pipe 1 to the inner peripheral surface of the frame 52 is larger than the radius of the hose 2 and the radius of the clamp part 31 of the expanded hose clamp 3, and the protruding piece 32 from the axial center of the hose clamp 3 , 33 is smaller than the distance R2 to the outer peripheral end. Therefore, the frame part 52 does not interfere with the outer peripheral surface of the hose 2 or the clamp part 31 of the hose clamp 3, and the position of only the protruding pieces 32 and 33 can be regulated.

The frame 52 surrounds the protruding pieces 32 and 33 of the hose clamp 3, and the protruding pieces 32 and 33 protrude from the accommodation hole 53 in the radial direction. The inner dimension L1 of the receiving hole 53 is set to be longer than the axial length L2 including the protruding pieces 32 and 33 of the hose clamp 3 and the clip 4, and the inner dimension W1 of the receiving hole 53 is the protruding piece 32 of the hose clamp 3. , 33 are set wider than the widthwise dimension W2 in the open state (reduced diameter state). A narrow entrance 54 is formed at the center of one end of the housing hole 53 in the axial direction, that is, at the center of one end on the opening end side of the pipe 1. The opening width W3 of the entrance 54 is a width that allows the protruding pieces 32 and 33 of the hose clamp 3 to pass only in a state where they are close to each other. Here, the protruding piece 32 and 33 can be passed with the clip 4 sandwiched therebetween. The width is set. Therefore, the opening width W3 is narrower than the width W2 of the protruding pieces 32 and 33 (see FIG. 2) in a state where the clip 4 is removed (opened state). In other words, the following relationship is set.
W3 <W2 <W1

  The front end of the frame portion 52 of the clamp holder 5 is located on the far side from the open end of the pipe 1. That is, the distance from the fixing part 51 of the clamp holder 5 to the opening end of the pipe 1 is set sufficiently longer than the distance from the fixing part 51 of the clamp holder 5 to the tip of the frame part 52. Therefore, even if the portion of the hose 2 outside the pipe 1 is bent or vibrated, the portion of the hose 2 connected to the pipe 1 does not bend or vibrate, and the hose clamp 3 is not affected. As a result, the clamp holder 5 only has to handle the force in the direction in which the hose clamp 3 is pulled out.

  Next, a method of using the clamp structure having the above configuration will be described with reference to FIG. First, as shown in (a), the protruding pieces 32 and 33 of the hose clamp 3 are clamped by using the clip 4 or the like, and the hose clamp 3 is inserted into the outer periphery of the hose 2 in an expanded state. When the hose 2 is inserted into the pipe 1, the hose clamp 3 is in a diameter-expanded state, so that it can be smoothly inserted. When the hose 2 is further inserted, the projecting pieces 32 and 33 are sandwiched by the clip 4 and become narrow, so that they easily pass through the entrance 54 of the clamp holder 5 and are inserted into the receiving hole 53 (see FIG. 5 (b)). The hose 2 is inserted until its distal end surface comes into contact with the leg portion 55 of the clamp holder 5. When the clip 4 is removed in this state, the diameter of the hose clamp 3 is reduced by its own spring elasticity, and at the same time, the projecting pieces 32 and 33 are opened and are prevented from coming off from the receiving hole 53 (see FIG. 5C). Due to the fastening force of the hose clamp 3, the hose 2 is strongly pressed against the pipe 1. Although the method of using the clip 4 has been described here, parts other than the clip 4 may be used, or the hose 2 may be connected while holding the protruding pieces 32 and 33 using a tool such as pliers.

  In the state where the hose 2 is connected as described above, when any tensile force acts on the hose 2, the hose clamp 3 is crimped to the outer peripheral surface of the hose 2, so that the hose clamp 3 will also come off with the hose 2 integrally. And However, since the protruding pieces 32 and 33 of the hose clamp 3 are prevented from coming off in the axial direction by the accommodation holes 53 of the clamp holder 5, the hose 2 is also reliably prevented from coming off. When a rotational force around the axial direction is applied to the hose 2, the hose 2 may rotate with respect to the pipe 1, but the protruding pieces 32 and 33 of the hose clamp 3 abut against the inner edge of the accommodation hole 53. Since the rotation angle is restricted, the hose 2 is not twisted more than necessary.

  When the hose 2 is removed from the pipe 1 for maintenance or the like, first, the protruding pieces 32 and 33 of the hose clamp 3 are sandwiched and brought close to each other to make the hose clamp 3 in an expanded state. By pulling the hose 2 in this state, the protruding pieces 32 and 33 can pass through the entrance 54 of the clamp holder 5 and the hose 2 can be removed.

[Second Embodiment]
6 to 8 show a clamp structure according to the second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The hose 2 and the hose clamp 3 are not shown. In the clamp structure of the present embodiment, the clamp holder 5A is formed of a single metal plate. At one end of the clamp holder 5A, a fixed part 51 that is curved so as to surround the outer periphery of the pipe 1 is formed. The fixed part 51 is fixed to the pipe 1 by brazing, welding, or the like. The fixed portion 51 and the frame portion 52 are connected by a leg portion 55. The frame portion 52 is formed in a flat plate shape and extends in the opening end direction in parallel to the pipe 1.

  A first annular convex portion (spool portion) 11 is formed on the outer peripheral surface near the opening end of the pipe 1, and a second annular convex portion is located at a distance away from the first annular convex portion 11 to the back side. (Spool part) 12 is formed. In this example, the outer diameter of the second annular convex portion 12 is set to be slightly larger than the outer diameter of the first annular convex portion 11, and the second annular convex portion 12 constitutes a stopper when the hose 2 is inserted. Yes. The second annular convex portion 12 is not limited to the spool portion, and a ring-shaped component may be fixed to the outer peripheral surface of the pipe 1. The fixing portion 51 of the clamp holder 5 </ b> A is fixed to the back side from the second annular convex portion 12.

  Similarly to the first embodiment, in the case of this embodiment, the protruding pieces 32 and 33 of the hose clamp 3 are connected to the clamp holder 5A by inserting the hose 2 in the expanded state into the hose 2 and inserting it into the pipe 1. It can be inserted into the receiving hole 53 from the entrance 54. Note that the tip of the hose 2 stops by hitting the second annular convex portion 12 of the pipe 1 instead of the leg portion 55 of the clamp holder 5A. Thereafter, by removing the clip 4 and reducing the diameter of the hose clamp 3, the hose 2 can be fastened and the hose clamp 3 can be prevented from being detached by the accommodation hole 53. In this embodiment, since the clamp holder 5 can be comprised by 1 component, it can comprise at further low cost.

  The clamp holder is not limited to those shown in the first and second embodiments. For example, when the clamp holder is composed of a pair of metal plates as in the first embodiment, the fixing portions 51 are curved so as to surround approximately half the circumference of the pipe 1 without joining them in advance, and the legs 55 are connected to each other. The pipe 1 may be sandwiched between the pair of fixing parts 51 and the clamp holder may be fixed to the pipe 1 by screwing in an overlapped state. In this case, the clamp holder need not be fixed to the pipe 1 in advance, and may be fixed when the hose 2 is connected. When the second annular convex portion 12 is formed in advance in the pipe 1, the fixing portion 51 may be fastened behind the annular convex portion 12 to prevent the annular convex portion 12 from coming off.

  The hose clamp 3 is not limited to a press-formed sheet metal, but may be a bent metal wire. The pipe 1 is not limited to a metal pipe, and may be a resin pipe or a hard pipe. The clamp structure of the present invention can be applied to various uses other than an oil cooling system for an automobile transmission. For example, the present invention may be applied to a hose connection part of a cooling water pipe, may be applied to a hose connection part of an intake pipe, and may further be applied to a hose connection part of a brake pipe.

1 Pipe 11 First annular convex portion 12 Second annular convex portion (annular convex portion)
2 Hose 3 Hose clamp 31 Clamp part 32, 33 Protruding piece 4 Clip 5, 5A Clamp holder 51 Fixing part 52 Frame part 53 Receiving hole 54 Entrance 55 Leg part

Claims (1)

A hose clamp structure in which a hose is connected to the outer peripheral surface of the piping part, and the hose is fastened with a hose clamp,
The hose clamp is formed in a ring shape in which both ends intersect, and has a spring portion in the direction of being reduced in diameter in a free state from the outer diameter of the hose, and is formed to project radially from both ends of the clamp portion. In the clamp structure having a protruding piece that can make the clamp part in an expanded diameter state by being close to each other,
One end portion is fixed to the pipe portion, and the other end portion includes a clamp holder in which a frame portion surrounding the protruding piece of the hose clamp is formed,
A housing hole for accommodating the projecting piece therein and restricting the axial movement of the projecting piece is formed inside the frame portion, and the projecting piece of the hose clamp is provided at one axial end side of the housing hole. A clamp structure characterized in that an entrance is provided that can pass only when they are close to each other.

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