JP4692352B2 - Hose clamp - Google Patents

Description

  The present invention relates to a hose clamp used when a hose is firmly connected to a pipe body, for example, a hose clamp for fastening an aqueous hose such as a radiator hose or a heater hose of an automobile to the pipe body.

  In automobile radiator piping, for example, rubber or elastomer hoses are used, and the fitting ends of the hoses are fitted to the outer circumferences of the insertion ends of the pipe body of the radiator and the pipe body on the engine side, for example. As a result, the radiator and the engine side are connected.

  In order to prevent such a hose from coming off from the pipe body and to prevent leakage of flowing water from the connecting part of the hose and the pipe body, an annular bulge is formed at the distal end side of the insertion end of the pipe body. Then, the fitting end of the hose is tightly fitted and connected to the outer periphery of the insertion end where the bulge is formed. However, unlike the case of a resin tube, the rubber or elastomer hose itself cannot be expected to have a sufficient fixing force for the pipe body. Therefore, a connection structure is usually adopted in which a hose clamp is fitted to the outer periphery of the fitting end of the hose at the rear of the bulge, and the fitting end of the hose is fastened to the insertion end of the pipe body by this hose clamp. Yes.

  As a hose clamp, a hose clamp is used which is composed of a clamp body made of a spring elastic material having both ends in the circumferential direction and is formed in an annular shape. By tightening the fitting end of the hose, it is fixed in close contact with the pipe body. The clamp body may be formed in a C shape having an opening between both ends in the circumferential direction. However, in order to improve the sealing performance between the hose and the pipe body, both ends in the circumferential direction intersect in the circumferential direction. In some cases, it is formed so that the fitting end can be tightened over the entire circumference. In the clamp body formed so that both ends in the circumferential direction intersect, a pair of grip portions are provided at both ends in the circumferential direction, and the clamp body is in an expanded state by joining the pair of grip portions with, for example, a clip. Retained. Then, for example, by removing the clip and releasing the joining of the grip portion, the clamp body is elastically reduced in diameter and tightens the fitting end portion of the hose.

  However, even if a clamp body in which both ends in the circumferential direction are crossed is used, the fitting end of the hose is not uniformly tightened over the entire circumference, and unevenness in the tightening force occurs in the circumferential direction. For example, the tightening force or the amount of contraction between the grip portion and the radially opposite portion of the grip portion is usually smaller than the tightening force or the amount of contraction between portions that are about 90 degrees away from the grip portion on both sides. It is. Therefore, it is difficult to ensure good sealing performance between the hose and the pipe body over the entire circumference. Therefore, it is conceivable to form a hose clamp having an appropriate tightening performance by forming a plurality of clamp portions and adjusting the clamp function of each clamp portion. In this regard, Patent Document 1 discloses a technique for connecting a plurality of clamp bodies with connecting pieces.

Japanese Patent Laid-Open No. 10-148292

  However, the hose clamp described in Patent Document 1 is obtained by connecting C-shaped clamp bodies provided with openings between both ends in the circumferential direction so that the opening positions coincide with each other. It is not intended to ensure sealing performance over the entire circumference. Therefore, even if such a hose clamp is used, it is not always possible to ensure a sufficient sealing performance between the hose and the pipe body.

  Then, this invention aims at provision of the hose clamp which can clamp a hose to a pipe body so that it may have the outstanding sealing performance.

  To achieve this object, the hose clamp of the present invention is a hose clamp for tightening a fitting end portion of a hose fitted to an insertion end portion of a pipe body, and includes a first clamp portion on one axial side, A second clamp part on the other side in the axial direction, wherein the first clamp part is formed in a ring shape so as to be fitted to the outer periphery of the fitting end part. And a pair of first grip portions formed at both ends in the circumferential direction of the first clamp body, and the first clamp body has an enlarged diameter to which the first grip portion is joined. When the joining of the first grip portion is released from the state, it is formed so as to elastically return to the reduced diameter state by intersecting both circumferential ends in the circumferential direction, and to tighten the fitting end portion, 2 clamp part is fitted to the outer periphery of the fitting end. A second clamp body made of a spring elastic material formed in a ring shape, and a pair of second grip portions formed at both ends in the circumferential direction of the second clamp body, When the joint of the second grip portion is released from the expanded diameter state in which the second grip portion is joined, the clamp body 2 is brought into a reduced diameter state by intersecting both circumferential ends in the circumferential direction. The first clamp body and the second clamp body are connected via a connection piece, and the connection piece is connected to the first end. The first grip portion of the clamp body and the second grip portion of the second clamp body are shifted by 90 degrees or almost 90 degrees (one quarter or almost one quarter turn) in the circumferential direction. Position (for example, based on the state where the fitting end is tightened) To), in which are connected the first clamping member and the second clamping member.

  In the first clamp part, simply by releasing the joining of the first grip part, the diameter of the first clamp body is automatically reduced, and the fitting end of the hose is tightened. In the second clamp portion, the diameter of the second clamp body is automatically reduced only by releasing the joining of the second grip portion, and the fitting end portion of the hose is tightened. The connecting piece includes a first grip portion (for example, the center in the circumferential direction of the pair of first grip portions) and a second grip portion (for example, the center in the circumferential direction of the pair of second grip portions). The first clamp body and the second clamp body are connected so as to be shifted by 90 degrees or approximately 90 degrees in the direction. Here, for example, the circumferential position of the location where the tightening by the first clamp body may be the weakest and the location where the tightening by the second clamp body may be the strongest match, The circumferential position of the location where the tightening by the first clamp body is most likely to be the same as the location where the tightening by the second clamp body is the weakest is the same. Therefore, the achievement of an excellent sealing effect can be expected.

  The connecting piece includes a first grip portion of the first clamp body (for example, a circumferential center of the pair of first grip portions) and a radially opposite portion, and a second grip portion of the second clamp body. A portion (for example, based on a state in which the fitting end portion is tightened) is connected that is shifted by 90 degrees or substantially 90 degrees in the circumferential direction (for example, the center in the circumferential direction of the pair of second grip portions). It is preferable. By comprising in this way, the 1st grip part and the 2nd grip part will be located 90 degrees or almost 90 degrees shifted in the peripheral direction, and also the diameter reduction operation of the 1st clamp body is, The second clamp body can be kept from being affected.

  As described above, when the hose clamp of the present invention is used, the first clamp portion and the second clamp portion enable sufficient tightening over the entire circumference of the fitting end portion of the hose.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 is a perspective view showing a state in which a hose is fastened to a pipe body using a hose clamp according to the present invention, FIG. 2 is a plan view showing a state in which a hose is fastened to a pipe body using a hose clamp, and FIG. It is sectional drawing which shows the state which fastened the hose to the pipe body using the clamp.

  The pipe body 1 protruding from the engine-side part of the automobile is made of, for example, metal, and has an annular bulge portion 5 that swells in the radial direction at the tip of the insertion end portion 3.

  The hose 7 is for connecting the engine-side parts and the radiator to form a radiator pipe, and is mainly composed of a rubber layer, and is formed by arranging a reinforcing layer formed of a reinforcing wire in the rubber layer. Thus, the fitting end 9 at the end in the length direction is connected to the pipe body 1 by tightly fitting the outer end of the insertion end 3 of the pipe body 1.

  The fitting end 9 of the hose 7 is fitted to the outer periphery of the insertion end 3 of the pipe body 1 while expanding the diameter.

  A hose clamp 11 is fitted on the outer periphery of the fitting end 9 of the hose 7 fitted to the insertion end 3 of the pipe body 1. The hose clamp 11 has a fitting end 9 fastened to the insertion end 3 behind the bulge part 5, and a first clamp part 13 on one side in the axial direction and a second clamp part on the other side in the axial direction. 15. The first clamp portion 13 includes a first clamp body 17 having spring elasticity formed as an annular plate body, and a pair of first clamps formed at both ends in the circumferential direction of the first clamp body 17. Grip portions 23, 23. A crossing slit 25 is provided on one end side in the circumferential direction (one side in the circumferential direction) of the first clamp body 17, and the other end side in the circumferential direction of the first clamp body 17 is passed through the crossing slit 25. ing.

  The second clamp part 15 is also formed as an annular plate body, and has a second clamp body 27 having spring elasticity, and a pair of second clamp bodies 27 formed at both ends in the circumferential direction of the second clamp body 27. Grip portion 29, 29, and a crossing slit 31 is provided on one end side in the circumferential direction (one side in the circumferential direction) of the second clamp body 27, and the other end side in the circumferential direction of the second clamp body 27. Is passed through the crossing slit 31.

  The first clamp body 17 and the second clamp body 27 are integrally connected by a connecting piece 33. The connecting piece 33 has the same width (circumferential width) as the width (axial width) of the first clamp body 17 and the second clamp body 27, or the first clamp body 17 and the second clamp. It has a width narrower than the width of the body 27 and a length shorter than the width of the connecting piece 33 (length in the axial direction). The connecting piece 33 includes the first grip portion 23 (the circumferential center of the first grip portions 23, 23) of the first clamp body 17, the radially opposite portion 35, and the second clamp body 27. A portion 37 that is separated from the grip portion 29 (the center in the circumferential direction of the second grip portions 29, 29) by a central angle of 90 degrees in the circumferential direction is connected. Accordingly, the first clamp part 13 and the second clamp part 15 are composed of the first grip part 23 (the center in the circumferential direction of the first grip parts 23 and 23) and the second grip part 29 (the second grip part). 29, 29 in the circumferential direction) is formed so that the central angle is shifted by 90 degrees in the circumferential direction or away from it.

  The hose clamp 11 joins the pair of first grip portions 23, 23 (for example, joins with a holding clip) so that the first clamp body 17 is in an expanded state, and the second clamp body 27. The pair of second grip portions 29, 29 are joined (for example, joined with a holding clip) so as to be in an expanded diameter state, and fitted to the fitting end portion 9. When the fitting end portion 9 is fitted to the insertion end portion 3 of the pipe body 1, the joining of the first grip portions 23 and 23 and the joining of the second grip portions 29 and 29 are sequentially released, for example. (For example, remove the retaining clip). Then, the first clamp body 17 is elastically returned to the reduced diameter state by crossing the circumferential direction both ends in the circumferential direction (in this case, expanding the circumferential crossing range of the circumferential ends), and the fitting end The portion 9 is tightened, and the second clamp body 27 is also elastically returned to a reduced diameter state by crossing both circumferential ends in the circumferential direction (in this case, widening the circumferential crossing range of both circumferential ends), Tighten the fitting end 9. Here, tightening of the fitting end portion 9 by the first clamp body 17 is performed between the first grip portion 23 (circumferential center of the first grip portions 23, 23) and the radially opposite portion 35. It is relatively weak and relatively strong between the first grip portion 23 (circumferential center of the first grip portions 23, 23) and the circumferential central portion 39, 39 of the radially opposite portion 35. Further, the tightening of the fitting end portion 9 by the second clamp body 27 is compared between the second grip portion 29 (the center in the circumferential direction of the second grip portions 29, 29) and the radially opposite portion 41. It is relatively weak and relatively strong between the second grip portion 29 (the center in the circumferential direction of the second grip portions 29, 29) and the circumferential center portion 37, 37 of the radially opposite portion 41. Accordingly, since the tightening strength pattern of the first clamp body 17 and the second clamp body 27 is reversed, both the first clamp body 17 and the second clamp body 27 are suitable over the entire circumference. Tightening force will be secured.

  In addition, the circumferential direction of the 1st grip part 23 (the circumferential direction center of the 1st grip parts 23 and 23) and the 2nd grip part 29 (the circumferential direction center of the 2nd grip parts 29 and 29) here. The angle or interval of the deviation is based on the state in which the fitting end 9 of the hose 7 is tightened.

  The hose connection structure of the present invention can be used for connecting a radiator hose or a heater hose, for example, as one that can improve the sealing performance without deteriorating the assemblability.

It is a perspective view which shows the state which fastened the hose to the pipe body using the hose clamp which concerns on this invention. It is a top view which shows the state which fastened the hose to the pipe body using the hose clamp. It is sectional drawing which shows the state which fastened the hose to the pipe body using the hose clamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe body 3 Insertion end part 7 Hose 9 Insertion end part 11 Hose clamp 13 1st clamp part 15 2nd clamp part 17 1st clamp body 23 1st grip part 27 2nd clamp body 29 2nd Grip part 33 connecting piece

Claims (2)

A hose clamp for tightening a fitting end of a hose fitted to an insertion end of a pipe body,
A first clamp portion on one axial side and a second clamp portion on the other axial side;
The first clamp part is formed in a first clamp body made of a spring elastic material formed in an annular shape so as to be fitted to the outer periphery of the fitting end, and at both ends in the circumferential direction of the first clamp body. A pair of first grip portions, and the first clamp body is released from the expanded state in which the first grip portion is joined, and the joining of the first grip portion is released. And elastically return to the diameter-reduced state by intersecting both ends in the circumferential direction in the circumferential direction, formed to tighten the fitting end,
The second clamp part is formed in a ring-shaped second clamp body made of a spring elastic material so as to be fitted on the outer periphery of the fitting end, and at both ends in the circumferential direction of the second clamp body. And the second clamp body is released from the expanded state in which the second grip part is joined, and the second grip part is released from the joined state. And is formed so as to elastically return to the reduced diameter state by intersecting both ends in the circumferential direction in the circumferential direction, and to tighten the fitting end,
The first clamp body and the second clamp body are coupled via a connection piece,
The connection piece is positioned so that the first grip portion of the first clamp body and the second grip portion of the second clamp body are shifted by 90 degrees or substantially 90 degrees in the circumferential direction. The hose clamp characterized by connecting the said 1st clamp body and the said 2nd clamp body. The connecting piece is shifted by 90 degrees or substantially 90 degrees in the circumferential direction from the first grip portion of the first clamp body and the second grip portion of the second clamp body in a radial direction opposite to the first grip portion. The hose clamp according to claim 1, wherein the parts are connected.

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