JP5611292B2 - Pipe connection structure - Google Patents

Description

  The present invention relates to a pipe connection structure, and more particularly to a pipe connection structure for connecting a pipe installed along the surface of a device housing such as a transmission or an engine to an opening of a fluid passage of a device case. It is.

  For example, in a transmission, an oil pipe is installed along the surface of a housing, and an end of the oil pipe is connected to an opening of a fluid passage of the housing through a joint (for example, Patent Document 1).

  In Patent Document 1, an eye joint is connected to an end of a pipe, and the eye joint is connected to an opening of a fluid passage of the housing by an eyebolt, thereby connecting the pipe to the fluid passage of the housing.

Japanese Patent Laid-Open No. 2003-106493 (see FIG. 2)

  However, the pipe connection structure disclosed in Patent Document 1 requires an eye joint, an eye bolt, and two washers. The number of parts is high, the price of the parts is high, and there are many seal points. There were many items.

  The present invention has been made in view of the actual circumstances of the background art as described above, and an object of the present invention is to provide a pipe connection structure that can reduce the cost of parts and has few seal points.

In order to achieve the above-described object, the pipe connection structure according to claim 1 is configured such that a tip end portion of a pipe piped along the device housing is bent at approximately 90 degrees, and the tip end of the bent portion is opened in a fluid passage of the device housing. A pipe connection structure that is inserted into and connected to a pipe, and includes a cylindrical joint and a stay formed by a plate body having a thickness substantially the same as the wall thickness of the pipe to be connected. Each of the stays is formed with a joint insertion hole in the center, and a tongue piece is extended in part, and the stay has a joint insertion hole. in a state in which is fitted in-out annular notch of the joint, as well as fixing the opening of the joint is fitted in the bent tip of the pipe, the peripheral portion of the joint insertion hole of the stay of the joint In-out Jo notch, also the tongues of the stay respectively is fixed to the straight pipe portion of the pipe, while being fitted an O-ring in the annular recess of the joint, inserting the joint into a fluid passage of the instrument housing is, by fixing the stay on the apparatus housing, characterized in that to connect the tip of the pipe to the equipment housing.

  According to the pipe connection structure of the present invention described above, the end of the pipe is bent, the end of the bent portion is inserted into the opening of the fluid passage of the equipment housing, and the outer periphery of the inserted pipe and the fluid passage of the equipment housing Since the inner ring is sealed with an O-ring, the pipe can be compactly connected with a small number of parts by performing a minimum right angle bend, and the number of seals is small and management is easy. Further, since the O-ring for sealing is fitted to the peripheral surface of the joint fixed to the tip of the pipe, it is positioned and hardly falls off, so that it can be easily connected.

It is sectional drawing which showed the reference example of the connection structure of a pipe. It is sectional drawing which showed the modification of the connection structure of the pipe which concerns on the reference example of FIG. It is sectional drawing which showed the other reference example of the connection structure of a pipe. It is sectional drawing which showed the modification of the connection structure of the pipe which concerns on the reference example of FIG. It is sectional drawing which showed one Embodiment of the connection structure of the pipe which concerns on this invention. It is sectional drawing which showed the modification of the connection structure of the pipe which concerns on this invention of FIG.

  Embodiments of a pipe connection structure according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a sectional view showing a reference example of a pipe connection structure. In the pipe connection structure 10 shown in FIG. 1, a fluid passage 11a is formed in a device housing 11 of a clutch, an engine, etc. A counterbore 11b is formed in the opening. A female screw hole 11c is formed at the opening edge of the counterbore 11b.

  The pipe 12 piped along the surface of the device housing 11 is bent at a minimum right angle of about 90 degrees at the end, and a flange 12b is formed at the end of the bent portion 12a by curling or the like.

It is sectional drawing which showed the reference example of the connection structure of a pipe. It is sectional drawing which showed the modification of the connection structure of the pipe which concerns on the reference example of FIG. It is sectional drawing which showed the other reference example of the connection structure of a pipe. It is sectional drawing which showed the modification of the connection structure of the pipe which concerns on the reference example of FIG. It is sectional drawing which showed one Embodiment of the connection structure of the pipe which concerns on this invention. It is sectional drawing which showed the other reference example of the connection structure of a pipe .

  It should be noted that fixing between the cylindrical protruding portion 13b and the bent portion 12a of the pipe 12 and between the tongue piece 13e and the straight pipe portion 12c of the pipe 12 is not necessarily required. The positioning of the stay 13 with respect to the pipe 12 and the assembling work to the equipment housing 11 can be facilitated.

  In this pipe connection structure 10, the bent portion 12 a is connected to the equipment housing 11 with an O-ring 14 inserted between the flange 12 b of the bent portion 12 a of the pipe 12 and the tip of the cylindrical protruding portion 13 b of the stay 13. The pipe 12 is fastened to the device housing 11 by inserting the screw 15 into the counterbore 11b, the screw 15 through the screw insertion hole 13d of the stay 13, and screwing the tip of the screw 15 into the female screw hole 11c of the device housing 11. .

  According to the pipe connection structure 10 assembled in this way, the O-ring 14 is restrained between the flange 12b of the pipe 12 and the cylindrical protrusion 13b of the stay 13, and the peripheral surface of the pipe 12 and the equipment housing 11 are connected. The space between the counterbore 11b and the counterbore 11b is sealed. The pipe 12 is connected to the device housing 11 by a stay 13.

  FIG. 2 is a sectional view showing a modification of the pipe connection structure according to the reference example of FIG. 1. In the pipe connection structure 20 shown in FIG. 2, a fluid passage 21 a is formed in the device housing 21. A counterbore 21b is formed in the opening of the fluid passage 21a. A female screw hole 21c is formed at the opening edge of the counterbore hole 21b.

  The pipe 22 piped along the surface of the device housing 21 is bent at a minimum right angle at approximately 90 degrees, and a flange 22b is formed at the tip of the bent portion 22a by curling or the like. Further, in the pipe 22, spools 22c and 22d are formed in the middle of the bent portion 22a. The spools 22c and 22d are for holding a later-described stay 23, and are formed by terminal processing after the stay 23 is inserted into the bent portion 22a of the pipe 22.

  The stay 23 is formed by a substantially circular plate body 23a, a pipe insertion hole 23b is formed at the center thereof, and a screw insertion hole 23c is formed between the pipe insertion hole 23b and the periphery. Further, a tongue piece 23d extends from a part of the plate body 23a, and the tongue piece 23d is bent upward in a crank shape.

  Then, the pipe insertion hole 23b of the stay 23 is fitted into the bent portion 22a of the pipe 22, the spools 22c and 22d are formed by terminal processing, and the plate body 23a of the stay 23 is sandwiched therebetween, and the pipe insertion hole The peripheral edge portion of 23b is fixed between the spools 22c and 22d of the pipe 22, and the tongue piece 23d is fixed to the straight pipe portion 22e of the pipe 22 by brazing or the like.

  It should be noted that fixing between the peripheral portion of the pipe insertion hole 23b and the spools 22c and 22d of the pipe 22 and between the tongue 23d and the straight pipe portion 22e of the pipe 22 is not necessarily required. By doing so, the positioning of the stay 23 with respect to the pipe 22 and the assembling work to the device housing 21 can be facilitated.

  Then, after the O-ring 24 is fitted between the flange 22b and the spool 22c, the tip of the bent portion 22a of the pipe 22 is fitted into the counterbore hole 21b of the device housing 21, and the screw insertion hole of the stay 23 is inserted. The pipe 22 is fastened to the device housing 21 by inserting the screw 25 into the 23 c and screwing the tip of the screw 25 into the female screw hole 21 c of the device housing 21.

  According to the pipe connection structure 20 assembled in this manner, the O-ring 24 is restrained between the flange 22b of the pipe 22 and the spool 22c, and the peripheral surface of the pipe 22 and the counterbore 21b in the device housing 21 Is sealed. Further, since the spools 22 c and 22 d are engaged with the stay 23, the pipe 22 is connected to the equipment housing 21 through the stay 23.

  FIG. 3 is a sectional view showing another reference example of the pipe connection structure. In the pipe connection structure 30 shown in FIG. 3, a fluid passage 31a is formed in the device housing 31, and the fluid passage 31a is formed. A counterbore 31b is formed in the opening. A female screw hole 31c is formed at the opening edge of the counterbore hole 31b.

  The pipe 32 piped along the surface of the device housing 31 is bent at a minimum right angle at approximately 90 degrees.

The pipe connection structure 30 includes a stay 33. The stay 33 is formed by a plate 33a, and a cylindrical protrusion 33b formed by burring or the like is formed at the center of the plate 33a. The cylindrical protrusion 33b has a flange 33c formed at the tip and a spool 33d formed in the middle. Further, a screw insertion hole 33f is formed between the pipe insertion hole 33e formed in the cylindrical projecting portion 33b and the periphery. In the stay 33, the cylindrical protruding portion 33b is fixed to the bent portion 32a of the pipe 32 by brazing or the like.

  In this pipe connection structure 30, the cylindrical protrusion 33 b is inserted into the countersunk hole of the equipment housing 31 in a state where the O-ring 34 is inserted between the flange 33 c and the spool 33 d of the cylindrical protrusion 33 b of the stay 33. The pipe 32 is fastened to the device housing 31 by being inserted into the screw 31 b, the screw 35 is inserted into the screw insertion hole 33 f of the stay 33, and the tip of the screw 35 is screwed into the female screw hole 31 c of the device housing 31.

  According to the pipe connection structure 30 assembled in this way, the O-ring 34 is restrained between the flange 33c of the stay 33 and the spool 33d, and the cylindrical protrusion 33b of the stay 33 and the countersink in the equipment housing 31 are countersunk. The space between the holes 31b is sealed. The pipe 32 is connected to the device housing 31 by a stay 33.

  4 is a cross-sectional view showing a modification of the pipe connection structure according to the reference example of FIG. 3. In the pipe connection structure 40 shown in FIG. 4, a fluid passage 41 a is formed in the device housing 41. A counterbore 41b is formed in the opening of the fluid passage 41a. A female screw hole 41c is formed at the opening edge of the counterbore hole 41b.

  The pipe 42 piped along the surface of the device housing 41 is bent at a minimum right angle by approximately 90 degrees.

  The pipe connection structure 40 includes a stay 43. The stay 43 is formed of a plate 43a, and a cylindrical protrusion 43b formed by burring or the like is formed at the center of the plate 43a. A spool 43c is formed at the tip of the cylindrical protrusion 43b. Further, a screw insertion hole 43e is formed between the pipe insertion hole 43d formed in the cylindrical protrusion 43b and the periphery. In the stay 43, the cylindrical projecting portion 43b is fixed to the bent portion 42a of the pipe 42 by brazing or the like.

  In this pipe connection structure 40, the cylindrical protruding portion 43b is connected to the device in a state where the O-ring 44 is inserted between the spool 43c of the cylindrical protruding portion 43b of the stay 43 and the base portion 43f of the cylindrical protruding portion 43b. The pipe 42 is fitted into the device housing 41 by being fitted into the counterbore hole 41 b of the housing 41, the screw 45 is inserted into the screw insertion hole 43 e of the stay 43, and the tip thereof is screwed into the female screw hole 41 c of the device housing 41. Conclude.

  According to the pipe connection structure 40 assembled in this manner, the O-ring 44 is constrained between the spool 43c and the base portion 43f of the stay 43, and the cylindrical protrusion 43b of the stay 43 and the device housing 41 are countersunk. The space between the holes 41b is sealed. The pipe 42 is connected to the device housing 41 by a stay 43.

  FIG. 5 is a cross-sectional view showing an embodiment of a pipe connection structure according to the present invention. In the pipe connection structure 50 shown in FIG. 5, a fluid passage 51 a is formed in an equipment housing 51. A counterbore 51b is formed in the opening of the fluid passage 51a. A female screw hole 51c is formed at the opening edge of the counterbore hole 51b.

  The pipe 52 piped along the surface of the device housing 51 is bent at a minimum right angle of approximately 90 degrees, and a joint 53 is disposed at the tip of the bent portion 52a. The joint 53 includes a flange-like portion 53a at an intermediate portion, an annular notch 53b is formed at the periphery of the proximal end, and an annular recess 53c is formed at the peripheral surface of the distal end portion.

  The pipe connection structure 50 includes a stay 54. In the stay 54, a joint insertion hole 54b is formed at the center of the plate body 54a, and a screw insertion hole 54c is formed between the joint insertion hole 54b and the periphery. Further, a tongue piece 54d extends from a part of the plate 54a, and the tongue piece 54d is bent upward in a crank shape.

  In this pipe connection structure 50, the joint 53 is fitted to the tip of the bent portion 52 a of the pipe 52 with the joint insertion hole 54 b of the stay 54 fitted to the annular notch 53 b of the joint 53. The joint insertion hole 54b is fixed to the annular notch 53b of the joint 53 and the tongue piece 54d is fixed to the straight pipe portion 52b of the pipe 52 by brazing or the like.

  It should be noted that fixing between the peripheral edge portion of the joint insertion hole 54b of the stay 54 and the annular notch 53b of the joint 53 and between the tongue piece 54d and the straight pipe portion 52b of the pipe 52 is not necessarily required. However, by fixing, it is possible to facilitate the positioning of the stay 54 with respect to the pipe 52 and the assembling work to the equipment housing 51.

  After the O-ring 55 is fitted in the annular recess 53 c of the joint 53, the tip of the joint 53 is fitted into the counterbore 51 b of the device housing 51, and the screw 56 is inserted into the screw insertion hole 54 c of the stay 54. Then, the pipe 52 is fastened to the device housing 51 by screwing the tip thereof into the female screw hole 51 c of the device housing 51.

  According to the pipe connection structure 50 assembled in this manner, the O-ring 55 is restrained in the annular recess 53c of the joint 53 and abuts against the inner surface of the counterbore hole 51b in the device housing 51, so that the joint 53 and the device are connected. The space between the housing 51 is sealed. The pipe 52 is connected to the device housing 51 by a stay 54 via a joint 53.

6 is a sectional view showing still another reference example of the pipe connection structure. In the pipe connection structure 60 shown in FIG. 6, a fluid passage 61a is formed in the device housing 61, and the fluid passage is shown in FIG. A counterbore 61b is formed in the opening of 61a, and a large-diameter recess 61c is formed in the opening of the counterbore 61b. A flange 61d is formed at the opening edge of the recess 61c.

The pipe 62 piped along the surface of the device housing 61 is bent at a minimum right angle of about 90 degrees, and a joint 63 is disposed at the tip of the bent portion 62a.
The joint 63 includes a flange-like portion 63a at an intermediate portion, an annular notch 63b is formed on the peripheral edge of the base end, and an annular recess 63c is formed on the peripheral surface of the distal end portion.

  The pipe connection structure 60 includes a one-touch type retainer 64. The retainer 64 has a truncated cone shape, and includes elastic pieces 64a at appropriate locations on the peripheral surface, for example, at two locations facing each other, and a concave portion 64b is formed on the outer peripheral surface of the elastic piece 64a.

  In this pipe connection structure 60, the opening of the joint 63 is fitted to the tip of the bent portion 62a of the pipe 62 and brazed. After the O-ring 65 is fitted into the annular recess 63 c of the joint 63, the tip of the joint 63 is inserted into the counterbore 61 b of the device housing 61, and then the one-touch type retainer 64 is attached to the device housing 61. The annular recess 64b is engaged with the flange 61d of the device housing 61 in a state where the resilient piece 64a is pushed into the recess 61c against the urging force of the elastic piece 64a and the tip is brought into contact with the flange-like portion 63a of the joint 63.

  According to the pipe connection structure 60 assembled in this way, the O-ring 65 is constrained in the annular recess 63c of the joint 63 and abuts against the inner surface of the counterbore 61b in the equipment housing 61. The space between the housing 61 is sealed. Further, the pipe 62 is very easily connected to the device housing 61 via the one-touch type retainer 64.

  The embodiment of the pipe connection structure according to the present invention has been described above. However, the present invention is not limited to the embodiment described above, and the technical idea of the present invention described in the claims is not limited thereto. It goes without saying that various modifications and changes can be made within the scope.

DESCRIPTION OF SYMBOLS 10 Pipe connection structure 11 Equipment housing 11a Fluid passage 11b Counterbore hole 11c Female screw hole 12 Pipe 12a Bending part 12b Flange 12c Straight pipe part 13 Stay 13a Plate body 13b Cylindrical protrusion part 13c Pipe insertion hole 13d Screw insertion hole 13e Tongue piece 14 O-ring 15 Screw 20 Pipe connection structure 21 Equipment housing 21a Fluid passage 21b Counterbore hole 21c Female screw hole 22 Pipe 22a Bent part 22b Flange 22c, 22d Spool 22e Straight pipe part 23 Stay 23a Plate body 23b Pipe insertion hole 23c Screw insertion hole 23c Hole 23d Tongue piece 24 O-ring 30 Pipe connection structure 31 Equipment housing 31a Fluid passage 31b Counterbore hole 31c Female threaded hole 32 Pipe 32a Bending portion 33 Stay 33a Plate body 33b Cylindrical protruding portion 33c Flange 3 3d spool 33e pipe insertion hole 33f screw insertion hole 34 O-ring 35 screw 40 pipe connection structure 41 equipment housing 41a fluid passage 41b counterbore hole 41c female screw hole 42 pipe 42a bent portion 43 stay 43a plate body 43b cylindrical protrusion 43c spool 43d Pipe insertion hole 43e Screw insertion hole 43f Base 44 O-ring 45 Screw 50 Pipe connection structure 51 Equipment housing 51a Fluid passage 51b Counterbore 51c Female thread hole 52 Pipe 52a Bent part 52b Straight pipe part 53 Joint 53a Flange-like part 53b Notch 53c Annular recess 54 Stay 54a Plate body 54b Joint insertion hole 54c Screw insertion hole 54d Tongue piece 55 O-ring 60 Pipe connection structure 61 Equipment housing 61a Fluid passage 61b Counterbore 61c Concave 62 pipe 62a retainer 64a resilient pieces 64b annular recess 65 O-ring bent portion 63 joint 63a flange portion 63b cutout 63c annular recess 64 one-touch

Claims (1)

A pipe connection structure in which the tip of a pipe that is piped along the equipment housing is bent at approximately 90 degrees, and the tip of the bent part is fitted into the opening of the fluid passage of the equipment housing for connection . The joint is provided with a stay formed by a plate body having a thickness substantially the same as the wall thickness of the pipe to be connected, and the joint has an annular notch on the peripheral edge of the base and an annular recess on the peripheral surface of the tip. The stay has a joint insertion hole formed in the center and a tongue piece extending in part, and the joint insertion hole of the stay is fitted in the annular notch of the joint. openings with fixed is fitted to the bent tip of the pipe, each solid peripheral portion of the joint insertion hole of the stay in-out annular notch joints, also the tongue of the stay in the straight pipe portion of the pipe It is allowed, while being fitted an O-ring in the annular recess of the joint, the joint is inserted into the fluid passage of the instrument housing, by fixing the stay on the apparatus housing, instrument housing the tip of the pipe A pipe connection structure characterized by being connected to a pipe.

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