JP2006306248A - Steering support beam and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a steering support beam which is good in productivity. <P>SOLUTION: In a first cylindrical portion of a coupling member equipped with first and second cylindrical portions formed with a receiving recessed portion on an inner peripheral surface, one end portion of a cylindrical first beam is inserted and fitted. One end portion of a cylindrical second beam is inserted ad fitted in a second cylindrical portion of the coupling member. While outer peripheral surfaces of both beams are retained by a retaining tool to seal the other ends of both beams, predetermined pressure is added on fluid sealed in both beams to expand the diameter of a part of both beam end portions and form diameter expanding portions. The diameter expanding portion is made to enter the receiving recessed portion of the inner peripheral surfaces of both cylindrical portions to lock. As at least one beam, a beam 2A formed with a ventilation port 110 is used. The restraining tool 51 wherein a sealing element 101 made from elastic member is fixed to an abutting surface with the ventilation port of the beam is used. When the outer peripheral surfaces of both beams are restrained by the restraining tool 51, the ventilation port 110 of the beam is blocked by the sealing element 101 in a liquidtight state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steering support beam installed between the left and right sides of a vehicle body such as an automobile and a method for manufacturing the same.

  In this specification, the term “aluminum” is used to include aluminum and its alloys.

  A steering support beam is installed between the left and right front pillars of the vehicle body inside the instrument panel at the front of the automobile. By arranging such a steering support beam, sufficient rigidity and strength against an impact caused by a collision from the side surface and the like are ensured. One or more vent holes are formed in the outer peripheral surface of the steering support beam in order to provide the function of an air conditioner duct. A plurality of mounting brackets for fixing the steering column, audio, instrument panel, airbag unit, and the like are fixed to the steering support beam by welding (see Patent Documents 1 and 2).

Thus, the steering support beam needs to have a relatively large strength on the driver's seat side, but does not require that much strength on the passenger seat side. A thick and large support beam is used on the side, and a thin and small support beam is used on the passenger seat side, and these support beams are connected by a connecting tool. For example, in Patent Document 1, a support beam having a large diameter on the driver's seat side and a support beam having a small diameter on the passenger's seat side are connected by a connector, and these are fixed using mechanical means such as bolts and nuts. It has been proposed to use a steering support beam having a configuration (see Patent Document 3).
Japanese Patent No. 3294659 JP 2003-170729 A JP 2001-253368 A

  However, in the configuration in which the bolt is fastened and fixed as described in Patent Document 3, the bolt is loosened due to the influence of heat in the use environment of the vehicle such as an automobile, that is, due to thermal expansion, and there is a possibility that sufficient coupling strength cannot be maintained. is there. Further, in the case of bolt fastening, there may be a portion where the bolt tightening torque is not sufficient.

  The plurality of mounting brackets are fixed to the steering support beam by welding, but there is a problem that the production efficiency is low due to the large number of man-hours required for welding these brackets.

  The present invention has been made in view of such a technical background, and is capable of connecting and fixing two support beams with sufficient strength, and has excellent productivity, and a steering support beam having a vent and its manufacture. It aims to provide a method.

  In order to achieve the above object, the present invention provides the following means.

[1] Fits a cylindrical first support beam, a second support beam having a diameter larger than the first support beam, a first cylindrical portion capable of fitting the first support beam, and the second support beam. A connecting member provided with a second cylindrical portion that can be combined,
A receiving recess is formed on the inner peripheral surface of the first cylindrical portion, and a receiving recess is formed on the inner peripheral surface of the second cylindrical portion,
An end portion of the first support beam is inserted and fitted into the first tubular portion of the connecting member, and a part of the inserted and fitted first support beam end portion is expanded in diameter. The diameter portion enters into the receiving recess on the inner peripheral surface of the first cylindrical portion and is locked,
An end portion of the second support beam is inserted and fitted into the second cylindrical portion of the connecting member, and a part of the inserted and fitted second support beam end portion is expanded in diameter. The first support beam and the second support beam are connected and fixed via a connecting member by the diameter portion entering and locking into the receiving recess of the inner peripheral surface of the second cylindrical portion,
A steering support beam, wherein one or a plurality of ventilation holes are formed in at least one of the first support beam and the second support beam.

  [2] The above-mentioned item 1, wherein a diameter-enlarged portion is formed by expanding the diameters of both sides of the attachment position of the connecting member in the both support beams, and the connecting member is sandwiched and fixed by these expanded-diameter portions. Steering support beam.

  [3] One or a plurality of mounting bracket fitting portions are externally fitted to at least one of the two support beams, and peripheral portions on both sides of the bracket fitting portion mounting position in the support beam are expanded. The mounting bracket is fixed to the support beam by the diameter-enlarged portion being formed by the diameter, and the fitting portion of the mounting bracket being sandwiched by the expanded-diameter portions around the both sides thereof. 3. The steering support beam according to 1 or 2 above.

  [4] The connection member is formed by connecting the first cylindrical portion and the second cylindrical portion with a connection plate portion, and the connection plate portion is formed with a communication hole. The steering support beam according to any one of claims.

  [5] The receiving recess according to any one of items 1 to 4, wherein the receiving recess is formed along a circumferential direction of an inner peripheral surface of the first cylindrical portion and / or an inner peripheral surface of the second cylindrical portion. Steering support beam.

  [6] The steering support beam according to any one of [1] to [5], wherein the connecting member includes a fixing protruding piece for fixing to the bottom of the vehicle body.

[7] The first cylindrical portion of the connecting member having the first cylindrical portion having the receiving concave portion formed on the inner peripheral surface and the second cylindrical portion having the receiving concave portion formed on the inner peripheral surface is provided with the cylindrical first portion. One end portion of the support beam is inserted and fitted, and one end portion of the cylindrical second support beam is inserted and fitted into the second cylindrical portion of the connecting member, and the outer peripheral surfaces of both the support beams are pressed by a pressing tool. And sealing the other end of the first support beam and the other end of the second support beam and enclosing a fluid inside the both support beams and applying a predetermined pressure to the fluid. The support beam end portions inserted and fitted into the connecting member are expanded in diameter to form an expanded diameter portion, and the expanded diameter portion is received in the receiving recesses on the inner peripheral surfaces of the cylindrical portions. A manufacturing method for intruding and locking,
A support beam in which one or a plurality of ventilation holes is formed is used as at least one of the first support beam and the second support beam, and the support beam is used as a support beam. Using a pressing tool in which a sealing body made of an elastic member is fixed to the contact surface, when the outer peripheral surfaces of the both support beams are pressed by the pressing tool, the vent holes of the support beams are closed in a liquid-tight state by the sealing body. A method for manufacturing a steering support beam.

[8] The first cylindrical portion of the connecting member including the first cylindrical portion having the receiving concave portion formed on the inner peripheral surface and the second cylindrical portion having the receiving concave portion formed on the inner peripheral surface is provided with the cylindrical first portion. One end of the support beam is inserted and fitted, and one end of the cylindrical second support beam is inserted and fitted into the second cylindrical portion of the connecting member, and the connecting member is attached to the outer peripheral surface of the both support beams. In the state where the remaining portions except for the peripheral portions on both sides of the position are pressed with a pressing tool and the other end portion of the first support beam and the other end portion of the second support beam are sealed, the fluid is introduced into the inside of the both support beams. By enclosing and applying a predetermined pressure to the fluid, a part of both support beam ends inserted and fitted in the connecting member is expanded to form an expanded diameter part, and the expanded diameter part Is inserted into the receiving recesses on the inner peripheral surfaces of the cylindrical portions and locked. To a manufacturing method for fixing sandwiching the connecting member by the enlarged diameter portion of both sides brought diameter on both sides periphery of the mounting position of the linking member in the both support beams,
A support beam in which one or a plurality of ventilation holes is formed is used as at least one of the first support beam and the second support beam, and the support beam is used as a support beam. Using a pressing tool in which a sealing body made of an elastic member is fixed to the contact surface, when the outer peripheral surfaces of the both support beams are pressed by the pressing tool, the vent holes of the support beams are closed in a liquid-tight state by the sealing body. A method for manufacturing a steering support beam.

[9] The first cylindrical portion of the connecting member having the first cylindrical portion having the receiving concave portion formed on the inner peripheral surface and the second cylindrical portion having the receiving concave portion formed on the inner peripheral surface is provided with the cylindrical first portion. One end portion of one support beam is inserted and fitted, and one end portion of a cylindrical second support beam is inserted and fitted to the second cylindrical portion of the connecting member, and the first support beam and / or the second support beam are inserted. The fitting part of one or more mounting brackets is externally fitted, and the remaining parts excluding the peripheral parts on both sides of the connecting member and the peripheral parts on both sides of the mounting bracket fitting part on the outer peripheral surface of both support beams are pressed. In a state where the other end portion of the first support beam and the other end portion of the second support beam are sealed, a fluid is sealed inside the both support beams, and a predetermined pressure is applied to the fluid. By inserting it into the connecting member. A part of both the support beam ends fitted to each other is enlarged to form an enlarged diameter part, and the enlarged diameter part is inserted into the receiving recesses on the inner peripheral surfaces of the two cylindrical parts and locked. The diameters of the peripheral portions on both sides of the attachment positions of the connection members in the both support beams are expanded and the connection members are sandwiched and fixed by the enlarged diameter portions on both sides, and the attachment positions of the attachment bracket fitting portions in the both support beams are fixed. It is a manufacturing method in which the mounting bracket fitting portion is sandwiched and fixed by expanding the diameters on both sides and expanding the diameters on both sides,
A support beam in which one or a plurality of ventilation holes is formed is used as at least one of the first support beam and the second support beam, and the support beam is used as a support beam. Using a pressing tool in which a sealing body made of an elastic member is fixed to the contact surface, when the outer peripheral surfaces of the both support beams are pressed by the pressing tool, the vent holes of the support beams are closed in a liquid-tight state by the sealing body. A method for manufacturing a steering support beam.

  [10] The seal body includes an embedded portion that is embedded and fixed in an embedded recess formed on the inner peripheral surface of the presser, and a protruding portion that is connected to the embedded portion and protrudes from the inner peripheral surface of the presser The method for manufacturing a steering support beam according to any one of items 7 to 9 above.

  [11] The seal body includes an embedded portion that is embedded and fixed in an embedded recess formed on the inner peripheral surface of the presser, and a protruding portion that is connected to the embedded portion and protrudes from the inner peripheral surface of the presser And a fitting convex part that is connected to the projecting part and has substantially the same shape and the same size as the opening shape of the vent hole. 10. The method according to any one of the preceding items 7 to 9, wherein when pressed, a fitting convex portion of the seal body is inserted and disposed in the vent hole of the support beam to close the vent hole in a liquid-tight state. Steering support beam manufacturing method.

  [12] The method for manufacturing a steering support beam according to any one of [7] to [11], wherein hard rubber is used as an elastic member constituting the seal body.

  [13] The connection member according to the above items 7 to 12, wherein the connection member is formed by connecting the first tubular part and the second tubular part with a connection plate part, and a communication hole is formed in the connection plate part. The manufacturing method of the steering support beam of any one of Claims.

  [14] The items 7 to 7 above, in which a cylindrical elastic member is arranged along the inner peripheral surfaces of the both support beams, a fluid is sealed inside the both support beams, and a predetermined pressure is applied to the fluid. 14. A method for manufacturing a steering support beam according to any one of items 13 to 14.

  [15] A steering support beam manufactured by the manufacturing method according to any one of items 7 to 14.

[16] A cylindrical first support beam and a cylindrical second support beam having an inner diameter larger than the outer diameter of the first support beam, and one of the first support beams in the second support beam. Part is inserted and arranged,
A fitting portion of one or a plurality of mounting brackets is fitted on the second support beam, and the peripheral portions on both sides of the bracket fitting portion mounting position in the second support beam are expanded in diameter, thereby the second expansion. A diameter portion is formed, and the fitting portion of the mounting bracket is sandwiched by the second diameter-expanded portions around the both sides thereof, whereby the mounting bracket is fixed to the second support beam,
The first expanded portion formed by expanding the corresponding region of the second expanded portion in the first support beam enters the inner recess of the second expanded portion of the second support beam. The first support beam and the second support beam are connected and fixed by being locked.
One or more fitting bracket fitting portions are externally fitted to a region of the first support beam that is not covered with the second support beam, and both sides of the bracket fitting portion attachment position in the first support beam. A third enlarged portion is formed by expanding the peripheral portion, and the fitting portion of the mounting bracket is sandwiched by the third enlarged portion at the peripheral portions on both sides, whereby the mounting bracket is Fixed relative to the first support beam;
A steering support beam, wherein one or a plurality of ventilation holes are formed in at least one of the first support beam and the second support beam.

  [17] The steering support beam according to [16], wherein each of the first enlarged diameter portion, the second enlarged diameter portion, and the third enlarged diameter portion is formed along a circumferential direction of the support beam.

  [18] The steering support beam according to item 16 or 17, wherein each of the first support beam, the second support beam, and the mounting bracket fitting portion has an elliptical cross section.

[19] The fitting portion of one or more mounting brackets is externally fitted to the cylindrical second support beam, and the remaining portions excluding the peripheral portions on both sides of the mounting bracket fitting portion on the outer peripheral surface of the second support beam. In a state where both parts of the second support beam are sealed with a pressing tool and a fluid is sealed inside the second support beam and a predetermined pressure is applied to the fluid, The second support beam is formed by enlarging the peripheral portions on both sides of the mounting position of the mounting bracket fitting portion in the second support beam to form a second enlarged diameter portion, and sandwiching the mounting bracket fitting portion by the second enlarged portions on both sides. A first step of fixing;
A part of the cylindrical first support beam is inserted and arranged in the second support beam after the diameter expansion, and one or a plurality of the first support beam is not covered with the second support beam. The fitting part of the mounting bracket is externally fitted, and the remaining parts of the outer peripheral surfaces of the both support beams except the peripheral parts on both sides of the mounting bracket are pressed with a presser and both ends of the support beam are sealed. In this state, by enclosing a fluid inside the both support beams and applying a predetermined pressure to the fluid, the corresponding region of the second expanded portion in the first support beam is expanded and the second region is expanded. A first enlarged diameter portion is formed, and the first enlarged diameter portion is inserted into and locked into an inner concave portion of the second enlarged diameter portion of the second support beam, and an attachment block in the first support beam is formed. A second step of forming a third enlarged portion by enlarging the peripheral portions on both sides of the mounting position of the bracket fitting portion, and sandwiching and fixing the mounting bracket fitting portion by the third enlarged portions on both sides; A manufacturing method comprising:
A support beam in which one or a plurality of ventilation holes is formed is used as at least one of the first support beam and the second support beam, and the support beam is used as a support beam. Using a pressing tool in which a sealing body made of an elastic member is fixed to the abutting surface, and sealing the support beam ventilation hole with the sealing body when the outer peripheral surface of the support beam is pressed by the pressing tool. A method of manufacturing a steering support beam characterized by the above.

  [20] The seal body includes an embedded portion that is embedded and fixed in an embedded recess formed on the inner peripheral surface of the presser, and a protruding portion that is connected to the embedded portion and protrudes from the inner peripheral surface of the presser 20. A method for manufacturing a steering support beam according to item 19 above.

  [21] The seal body includes an embedded portion that is embedded and fixed in an embedded recess formed on the inner peripheral surface of the presser, and a protruding portion that is connected to the embedded portion and protrudes from the inner peripheral surface of the presser And a fitting convex part that is connected to the projecting part and has substantially the same shape and the same size as the opening shape of the vent hole. 20. The method for manufacturing a steering support beam according to the above item 19, wherein, when pressed, the convex portion for fitting of the seal body is inserted and disposed in the vent hole of the support beam to close the vent hole in a liquid-tight state. .

  [22] The method for manufacturing a steering support beam according to any one of items 19 to 21, wherein a hard rubber is used as an elastic member constituting the seal body.

  [23] In the first step and the second step, a cylindrical elastic member is disposed so as to be along the inner peripheral surface of the support beam, and a fluid is sealed inside the support beam, so that a predetermined amount is set against the fluid. 23. The method for manufacturing a steering support beam according to any one of the above items 19 to 22, wherein the pressure is applied.

  [24] The method for manufacturing a steering support beam according to any one of [19] to [23], wherein, in the second step, the first support beam is inserted and disposed over the entire inner length of the second support beam.

  [25] A steering support beam manufactured by the manufacturing method according to any one of items 19 to 24.

  In the invention of [1], the enlarged diameter portion formed by enlarging the diameter of a part of the support beam end portion inserted and fitted into the cylindrical portion of the connecting member is the receiving recess on the inner peripheral surface of the cylindrical portion. Since the first support beam and the second support beam are connected and fixed via the connecting member by intruding into and locking in, the large diameter support beam and the small diameter support beam are sufficient. Strong and stable connection. Since it is not connected and fixed using a bolt etc. like the prior art, there is no fear of a decrease in connection strength due to loosening of the bolt or the like. Further, since welding is not required for connection, the strength of the support beam is not reduced by the influence of heat. Furthermore, since welding is not required, there is also an advantage that different materials can be combined as a support beam and a connecting member. In addition, a vent hole is formed in the support beam, and the vent hole can function as a vent hole of the air conditioner duct. Therefore, the function of the air conditioner duct can be shared.

  In the invention of [2], since the connecting member is sandwiched and fixed by the enlarged diameter portions formed on both sides of the attachment position of the connecting member in the support beam, the connection strength can be further improved.

  In the invention of [3], since the bracket fitting portion is sandwiched and fixed by the enlarged diameter portions formed on both sides of the bracket fitting portion attachment position in the support beam, the mounting bracket is also sufficient with respect to the support beam. It is fixed in a stable state with a sufficient strength. Furthermore, since welding is not required, there is also an advantage that different materials can be combined as a support beam, a connecting member, and a mounting bracket.

  In the invention of [4], since the communication hole is formed in the connection plate portion of the connection member, when the fluid is enclosed in the support beam and the pressure is applied to the fluid to expand the diameter, Just by sealing the fluid from one end of the support beam, the fluid can be sealed inside both the support beams through the communication hole, and only a predetermined pressure is applied to the fluid from one end of either support beam. This has the advantage that productivity can be improved.

  In the invention of [5], the enlarged diameter portion of the end portion of the support beam is formed in the receiving concave portion formed along the circumferential direction of the inner peripheral surface of the first cylindrical portion and / or the inner peripheral surface of the second cylindrical portion. Since it enters and is locked, and the locking structure is formed along the circumferential direction of the inner peripheral surface of the cylindrical portion of the connecting member in this way, the connection strength can be further improved.

  In the invention of [6], it can be fixed in a stable state with sufficient strength with respect to the bottom of the vehicle body.

  In the inventions of [7], [8] and [9], the ends of the support beams inserted and fitted into the connecting member by enclosing the fluids in the support beams and applying a predetermined pressure to the fluids. A part of the part is enlarged to form an enlarged part, and the enlarged part is intruded into the receiving recesses on the inner peripheral surfaces of both cylindrical parts and locked. And can be connected in a stable state with sufficient strength. Further, since welding is not required for connection, the strength of the support beam is not reduced by the influence of heat. Moreover, since it can manufacture using the support beam in which the vent hole was formed and it is not necessary to drill a vent hole after connection, productivity can be improved.

  Further, in the inventions of [8] and [9], the peripheral portions on both sides of the attachment positions of the connection members in both support beams are expanded by the fluid pressure, and the connection members are sandwiched and fixed by the expanded portions on both sides. The connection strength of the beam can be further improved.

  In addition, in the invention of [9], the peripheral portion on both sides of the mounting position of the mounting bracket fitting portion in both support beams is expanded by the fluid pressure, and the mounting bracket fitting portion is sandwiched by the enlarged portions on both sides. Since it is fixed, the mounting bracket can be fixed to the support beam with sufficient strength and in a stable state. As described above, in the invention [9], since it is a manufacturing method capable of simultaneously connecting both support beams through the connecting member and mounting and fixing one or more mounting brackets to the support beam, the manufacturing efficiency is improved. It can be improved significantly. Furthermore, since welding is not required, there is also an advantage that different materials can be combined as a support beam, a connecting member, and a mounting bracket. In addition, it is possible to manufacture using a support beam in which a vent hole is formed, and it is not necessary to drill a vent hole after mounting the bracket, so that productivity can be significantly improved. In the method of drilling vent holes in the outer peripheral surface of the support beam by pressing or the like after first expanding the caulking and attaching the brackets to the support beam (a method different from this manufacturing method), the attached bracket As a result, the workability of drilling a vent hole becomes very poor, and the productivity becomes remarkably low.

  In the invention of [10], when a predetermined pressure is applied to the fluid, the vent can be sealed in a liquid-tight state, so that leakage of fluid from the vent can be prevented.

  In the invention of [11], when a predetermined pressure is applied to the fluid, the fitting convex portion of the sealing body inserted into the vent is compressed by the fluid pressure, so that the peripheral side surface of the fitting convex portion Makes contact with the inner peripheral wall surface of the vent hole in a sufficiently liquid-tight state, so that leakage of fluid from the vent hole can be reliably prevented.

  In the invention of [12], leakage of fluid from the vent can be more reliably prevented.

  In the invention of [13], since the communication hole is formed in the connection plate portion of the connection member, the fluid is sealed from one end side of any one of the support beams, and the inside of both support beams through the communication holes. The fluid can be enclosed, and the diameter can be expanded simply by applying a predetermined pressure to the fluid from one end side of any one of the support beams, thereby further improving the production efficiency.

  In the invention of [14], a cylindrical elastic member is arranged in a manner along the inner peripheral surfaces of both support beams, a fluid is sealed in the both support beams, and a predetermined pressure is applied to the fluid. Therefore, the diameter can be sufficiently expanded.

  In the invention of [15], a steering support beam is provided in which a support beam having a large diameter and a support beam having a small diameter are connected in a stable state with sufficient strength.

  In the invention of [16], the first expanded portion formed by expanding the corresponding region of the second expanded portion in the first support beam is the inner recess of the second expanded portion of the second support beam. Since the first support beam and the second support beam are connected and fixed by entering and locking in, the second support beam having a large diameter and the first support beam having a small diameter have sufficient strength. And connected in a stable state. In addition, the bracket fitting part is sandwiched and fixed by the enlarged diameter parts (the second enlarged diameter part and the third enlarged diameter part) formed on both sides of the bracket fitting part attachment position in the support beam. The bracket is also sufficiently strong against the support beam and fixed in a stable state. Further, since welding is not required for connecting the beams and fixing the bracket, the strength of the support beam does not decrease due to the influence of heat, and the dimensional accuracy is good. Furthermore, since welding is not required, there is also an advantage that different materials can be combined as the first support beam, the second support beam, and the mounting bracket. In addition, since a part of the steering support beam (only on the driver's seat side) has a double pipe structure, it is possible to maintain sufficient lightness. In addition, a vent hole is formed in the support beam, and the vent hole can function as a vent hole of the air conditioner duct. Therefore, the function of the air conditioner duct can be shared.

  In the invention of [17], since the first expanded portion, the second expanded portion, and the third expanded portion are all formed along the circumferential direction of the support beam, the connection strength between the support beams and the bracket The fixing strength can be further improved.

  In the invention of [18], since the first support beam, the second support beam, and the mounting bracket fitting portion are all elliptical in cross section, when the bracket fitting portion is fixed to the support beam, the bracket It is possible to reliably prevent the fitting portion from rotating in the circumferential direction of the support beam.

  In the invention of [19], a fluid is enclosed in both the support beams and a predetermined pressure is applied to the fluid, thereby expanding a corresponding region of the second expanded portion in the first support beam to increase the diameter. Since the first enlarged diameter portion is formed and the first enlarged diameter portion is inserted into the inner concave portion of the second enlarged diameter portion of the second support beam to be locked, the second support beam having a larger diameter and the second smaller diameter beam are supported. One support beam can be coupled with sufficient strength and in a stable state. In addition, the bracket fitting part is sandwiched and fixed by the enlarged diameter parts (second enlarged part and third enlarged part) formed on both sides of the bracket fitting part attachment position in the support beam, so the mounting bracket is supported. It can be fixed in a stable state with sufficient strength against the beam. Further, since both the support beams can be connected and the mounting bracket can be fixed to the first support beam at the same time, the productivity is excellent. Further, since welding is not required for connecting the beams and fixing the bracket, the strength of the support beam does not decrease due to the influence of heat, and the dimensional accuracy is good. Furthermore, since welding is not required, there is also an advantage that different materials can be combined as the first support beam, the second support beam, and the mounting bracket. In addition, it is possible to manufacture using a support beam in which a vent hole is formed, and it is not necessary to drill a vent hole after mounting the bracket, so that productivity can be significantly improved. In the method of drilling vent holes in the outer peripheral surface of the support beam by pressing or the like after first expanding the caulking and attaching the brackets to the support beam (a method different from this manufacturing method), the attached bracket As a result, the workability of drilling a vent hole becomes very poor, and the productivity becomes remarkably low.

  In the invention [20], when a predetermined pressure is applied to the fluid, the vent can be sealed in a liquid-tight state, so that leakage of fluid from the vent can be prevented.

  In the invention of [21], when a predetermined pressure is applied to the fluid, the fitting convex portion of the sealing body inserted into the vent is compressed by the fluid pressure, so that the peripheral side surface of the fitting convex portion Makes contact with the inner peripheral wall surface of the vent hole in a sufficiently liquid-tight state, so that leakage of fluid from the vent hole can be reliably prevented.

  In the invention of [22], leakage of fluid from the vent can be prevented more reliably.

  In the invention of [23], in the first step and the second step, a cylindrical elastic member is arranged in a manner along the inner peripheral surface of the support beam, and a fluid is sealed in the support beam to Since a predetermined pressure is applied, the diameter can be sufficiently expanded.

  In the invention [24], since the first support beam is inserted and disposed over the entire length of the inside of the second support beam, the strength on the second support beam side can be sufficiently improved.

  In the invention of [25], the large-diameter second support beam and the small-diameter first support beam are coupled with sufficient strength and in a stable state, and the mounting bracket has sufficient strength with respect to the support beam. A steering support beam fixed in a stable state is provided.

  One embodiment of a steering support beam (10A) according to the first invention is shown in FIGS. The steering support beam (10A) of the present embodiment is a steering support beam for an automobile that is disposed between the left and right front pillars of a vehicle body and is connected and fixed to the front pillars. 1 and 2, (1A) is a first support beam, (2A) is a second support beam, (3) is a connecting member (node), (21) (24) (27) (30) (33) ( 36) is a mounting bracket.

  The first support beam (1A) and the second support beam (2A) are both made of a cylindrical extruded material having an elliptical cross section. The second support beam (2A) is formed larger in diameter than the first support beam (1A) and is disposed on the driver's seat side. On the other hand, the first support beam (1A) having a small diameter is disposed on the passenger seat side.

  The connecting member (3) has an elliptical cross section that can fit the first support beam (1A) and an elliptical cross section that can fit the second support beam (2A). The second cylindrical part (5) is provided, and the cylindrical parts (4) and (5) are connected by the connecting plate part (6). That is, the first cylindrical portion (4) extends on one side of the connecting plate (6) and the second cylindrical portion (5) on the other side of the connecting plate (6). Is extended. A single receiving recess (8) extending in the circumferential direction is formed on the inner peripheral surface of the first cylindrical portion (4), and the inner peripheral surface of the first cylindrical portion (5) is circumferentially formed. A receiving recess (9) extending along the line is formed. In addition, a communication hole (7) is provided in the central portion of the connection plate part (6), and the internal space of the first support beam (1A) and the second support beam are connected via the communication hole (7). The internal space (2A) is in communication. Further, a long center stay (fixing protruding piece) (19) is integrally extended from the lower part of the connecting member (3). The connecting member (3) connected to the center stay (19) is formed of an injection molding material.

  As shown in FIGS. 1 and 2, the front pillar mounting side bracket (21) includes a fitting portion (22) having an elliptical cross section that can be externally fitted to the second support beam (2 A), and the fitting portion ( 22) and an attachment portion (23) extending outward. Further, as shown in FIGS. 1 and 2, the other front pillar mounting side bracket (24) has an elliptical cross-section fitting portion (25) that can be externally fitted to the first support beam (1A), It consists of an attachment part (26) extended outward from this fitting part (25).

  As shown in FIGS. 1 and 2, the column mounting bracket (27) includes a fitting portion (28) having an elliptical cross section that can be externally fitted to the second support beam (2 A), and the fitting portion (28). And an attachment portion (29) projecting outward from the outer peripheral surface of the.

  As shown in FIGS. 1 and 2, the airbag unit mounting bracket (30) includes a fitting portion (31) having an elliptical cross section that can be externally fitted to the first support beam (1A), and the fitting portion ( 31) and an attachment portion (32) projecting outward from the outer peripheral surface.

  As shown in FIGS. 1 and 2, the audio mounting bracket (33) includes a fitting portion (34) having an elliptical cross section that can be externally fitted to the first support beam (1 A), and the fitting portion (34). And an attachment portion (35) extended outward.

  As shown in FIGS. 1 and 2, the glove box mounting bracket (36) includes a fitting portion (37) having an elliptical cross section that can be externally fitted to the first support beam (1 A), and the fitting portion (37 ) And an attachment portion (38) extending outward.

  The mounting brackets (21) (24) (27) (30) (33) (36) are all made of extruded material.

  Thus, the end portion of the first support beam (1A) is inserted and fitted into the first cylindrical portion (4) of the connecting member (3), and the first support beam (1A) fitted and fitted is inserted. The enlarged diameter portion (11B) protruding outward by partly expanding the diameter of the end portion enters the receiving recess (8) on the inner peripheral surface of the first tubular portion (4) and engages. It has been stopped. Further, the end of the second support beam (2A) is inserted and fitted into the second cylindrical portion (5) of the connecting member (3), and the end of the second support beam (2A) thus fitted and fitted. The diameter-enlarged portion (11A) that protrudes outward by partly expanding the diameter of the portion enters the receiving recess (9) on the inner peripheral surface of the second cylindrical portion (5) and is locked. Has been. Due to such a locking structure with respect to the connecting member (3), the first support beam (1A) and the second support beam (2A) are firmly connected and fixed via the connecting member (3).

  In addition, the peripheral portion (right peripheral portion) of the attachment position of the connecting member (3) in the first support beam (1A) is expanded in diameter to form the expanded diameter portion (12B) extending in the circumferential direction, The peripheral part (left peripheral part) of the attachment position of the connecting member (3) in the second support beam (2A) is enlarged in diameter to form an enlarged diameter part (12A) extending in the circumferential direction, and these enlarged diameter parts (12A) ) (12B), the connecting member (3) is sandwiched and fixed (see FIG. 1).

  Further, a fitting portion (25) of a front pillar mounting side bracket (24) is externally fitted to the outer peripheral surface of the end portion of the first support beam (1A) on the non-connection side, and the first support beam The diameter-enlarged portions (14A) and (14B) extending in the circumferential direction are formed by expanding the diameters of both sides of the fitting portion (25) attachment position in (1A), and the expanded-diameter portions (14A) and (14B) Since the fitting portion (25) of the side bracket (24) is sandwiched and fixed therebetween, the side bracket (24) is stably and firmly fixed to the first support beam (1A). Yes.

  In addition, a fitting portion (22) of a front pillar mounting side bracket (21) is externally fitted on the outer peripheral surface of the end portion on the non-connection side of the second support beam (2A), and the second support beam The diameter-enlarged portions (13A) and (13B) extending in the circumferential direction are formed by expanding the diameters of both sides of the fitting portion (22) mounting position in (2A), and these expanded-diameter portions (13A) and (13B) Since the fitting part (22) of the side bracket (21) is sandwiched and fixed therebetween, the side bracket (21) is stably and firmly fixed to the second support beam (2A). Yes.

  Further, the fitting portion (28) of the column mounting bracket (27) is fitted on the outer peripheral surface of the center portion of the second support beam (2A), and the fitting on the second support beam (2A) is performed. The diameter-enlarged portions (15A) and (15B) extending in the circumferential direction are formed by enlarging the diameters on both sides of the portion (28) mounting position, and the column-attaching portions are formed between these enlarged-diameter portions (15A) and (15B). By fitting and fixing the fitting portion (28) of the bracket (27), the column mounting bracket (27) is stably and firmly fixed to the second support beam (2A).

  The fitting portion (31) of the airbag unit mounting bracket (30) is externally fitted to the outer peripheral surface of the substantially central portion of the first support beam (1A), and the first support beam (1A). The diameter-enlarged portions (16A) and (16B) extending in the circumferential direction are formed by expanding the diameters at both sides of the fitting portion (31) attachment position in the above-described manner, and the diameter-enlarged portions (16A) and (16B) are formed between these expanded-diameter portions (16A) and (16B). By fitting and fixing the fitting portion (31) of the airbag unit mounting bracket (30), the airbag unit mounting bracket (30) is in a stable state with respect to the first support beam (1A). It is firmly fixed.

  Further, the fitting portion (34) of the audio mounting bracket (33) is fitted on the outer peripheral surface of the substantially central portion of the first support beam (1A), and the fitting on the first support beam (1A) is performed. The diameter-enlarged portions (17A) and (17B) extending in the circumferential direction are formed by enlarging the diameters on both sides of the joint portion (34) mounting position, and the audio mounting portion is formed between these expanded-diameter portions (17A) and (17B). By fitting and fixing the fitting portion (34) of the bracket (33), the audio mounting bracket (33) is stably and firmly fixed to the first support beam (1A). .

  Furthermore, a fitting portion (37) of a glove box mounting bracket (36) is fitted on the outer peripheral surface of the substantially central portion of the first support beam (1A), and the first support beam (1A) The diameter-enlarged portions (18A) (18B) extending in the circumferential direction are formed by expanding the diameters on both sides of the fitting portion (37) mounting position, and the globe is interposed between the expanded-diameter portions (18A) (18B). By fitting and fixing the fitting portion (37) of the box mounting bracket (36), the glove box mounting bracket (36) is stably and firmly fixed to the first support beam (1A). Has been.

  In this manner, the mounting brackets (21), (24), (27), (30), (33), and (36) are all securely fixed to the support beam in a stable state.

  In addition, as shown in FIGS. 1 and 2, ventilation is performed in a region between the mounting side bracket (21) mounting position and the column mounting bracket (27) mounting position on the outer peripheral wall of the second support beam (2A). A mouth (110) is formed. Further, vent holes (112) and (113) are formed in a region between the attachment position of the connecting member (3) and the attachment position of the audio attachment bracket (33) on the outer peripheral wall of the first support beam (1A). Yes. Also, a vent (111) is formed in a region between the mounting position of the airbag unit mounting bracket (30) and the mounting side bracket (24) mounting position on the outer peripheral wall of the first support beam (1A). ing. The steering support beam (10A) of the present embodiment combines the functions of an air conditioner duct, and the vents (110), (111), (112), and (113) function as vent holes of the air conditioner duct. It is. The vents (110), (111), (112), and (113) are not particularly limited, and are formed by, for example, pressing, machining, or the like.

  The center stay (elongated fixing projection piece) (19) extended from the connecting member (3) has its lower end fixed to the bottom of the passenger compartment. The front pillar mounting side bracket (21) is fixed to the front pillar on the driver seat side of the vehicle body, while the front pillar mounting side bracket (24) is fixed to the front pillar on the passenger seat side of the vehicle body, In this way, the steering support beam (10A) is firmly fixed to the vehicle body in a stable state.

  The connecting member (3) and the center stay member (20) may be configured separately. That is, for example, as shown in FIG. 12, the fixing protrusion piece (40) of the connecting member (3) and the center stay member (20) are connected and fixed by fixing means such as bolts, and the center stay member (20). You may make it fix the lower end part of this to the fixing member (91) protrudingly provided from the floor (90) using fixing means, such as a volt | bolt.

  The steering support beam (10A) according to the above configuration is manufactured as follows, for example. The first manufacturing method using fluid pressure will be described with reference to FIGS.

  First, a first cylindrical part (4) having an elliptical cross section capable of fitting the first support beam (1A) and a second cylindrical part having an elliptical cross section capable of fitting the second support beam (2A) ( 5) and a connecting plate portion (6) connecting these cylindrical portions (4) and (5), and extended along the circumferential direction on the inner peripheral surface of the first cylindrical portion (4). A single receiving recess (8) is formed, and a single receiving recess (9) extending along the circumferential direction is formed on the inner peripheral surface of the second cylindrical portion (5), and the connecting plate portion ( A connecting member (3) having a configuration in which a communication hole (7) is provided at the center of 6) is prepared (see FIG. 3).

  One end portion of the first support beam (1A) having an elliptical cross section is inserted and fitted into the first cylindrical portion (4) of the connecting member (3), and the second cylindrical portion of the connecting member (3). (5) One end portion of the second support beam (2A) having an elliptical cross section is inserted and fitted into the inside (see FIG. 3). In FIG. 3, reference numerals (68) and (69) denote O-rings arranged to realize a sufficiently liquid-tight state. Two vents (112) and (113) are formed at the end on the connecting member (3) side on the outer peripheral surface of the first support beam (1A), while one vent is formed at the end on the non-connecting member side. A mouth (111) is formed. A vent hole (110) is also formed at the end of the outer peripheral surface of the second support beam (2A) on the non-connecting member side (see FIG. 3).

  The fitting portion (34) of the audio mounting bracket (33) and the fitting portion (37) of the glove box mounting bracket (36) are fitted on the outer peripheral surface of the substantially central portion of the first support beam (1A). To do. Furthermore, the fitting portion (31) of the airbag unit mounting bracket (30) is externally fitted on the outer peripheral surface of the first support beam (1A) at a position close to the non-connecting side from the substantially central portion. Further, the fitting portion (25) of the front pillar mounting side bracket (24) is externally fitted to the outer peripheral surface of the end portion of the first support beam (1A) on the non-connection side.

  In addition, the fitting portion (28) of the column mounting bracket (27) is externally fitted to the outer peripheral surface of the center portion of the second support beam (2A), and the non-connection side of the second support beam (2A) The fitting portion (22) of the front pillar mounting side bracket (21) is externally fitted to the outer peripheral surface of the end portion. As described above, the mounting brackets (21) (24) (27) (30) (33) (36) are arranged at predetermined positions with respect to both the support beams (1A) (2A) (see FIG. 3).

  Next, as shown in FIG. 4, the peripheral portions on both sides of the connecting member (3) and the mounting bracket fitting portions (22) and (25) on the outer peripheral surface of the first and second support beams (1A) and (2A). (28) (31) (34) (37) The remaining parts excluding the peripheral parts on both sides are pressed by a split mold that can be divided into left and right parts (51) (53) (55) (56) (57) (59 ) And hold it in a pressed state. Furthermore, the outer side of the column mounting bracket (27) is sandwiched and held by a pressing tool (52) made of a split mold that can be divided into left and right parts, and the outside of the connecting member (3) is separated from the split mold that can be divided into left and right parts. Is held by being pressed and held by a pressing tool (54), and the outside of the airbag unit mounting bracket (30) is held by being pressed and pressed by a pressing tool (58) made of a split mold that can be divided into left and right. (See FIG. 4).

  The pressers (51) (53) are split molds that can be divided into right and left parts, and the inner peripheral surfaces of these split molds are formed in an inner peripheral surface shape that matches the outer peripheral surface of the second support beam (2A). ing. The pressers (55), (57), and (59) are split molds that can be divided into left and right parts, and the inner peripheral surfaces of these split molds are the inner peripheries that match the outer peripheral surface of the first support beam (1A). It is formed in a surface shape.

  As shown in FIGS. 6 and 9, one split mold of the presser (51) is formed on the contact surface of the presser (51) with the vent hole (110) of the second support beam (2A). The sealing body (101) made of an elastic member is fixed to the embedded recess (107). The seal body (101) includes an embedded portion (102) embedded in an embedded recess (107) formed on an inner peripheral surface (contact surface with the second support beam) of the presser (51). A projecting portion (103) connected to the embedded portion (102) and projecting inward from the inner peripheral surface of the presser (51); and connected to the projecting portion (103) and the vent ( 110) and a fitting convex portion (104) having substantially the same shape and the same size. The protrusion (103) is formed in such a size that the peripheral edge thereof can abut on the peripheral edge of the vent (110) in the outer peripheral wall of the second support beam (2A). It is preferable that the fitting projection (104) has a substantially similar shape in plan view, the diameter of which is reduced by 0.2 to 0.5 mm inward from the opening size of the vent (110). Further, the peripheral side surface of the fitting convex portion (104) has a taper that decreases in diameter toward the distal end side of the convex portion (104) so that the insertion operation into the vent hole (110) can be performed more smoothly. It may be formed on the surface. The sealing body (101) is fixed to the pressing tool (51) by fixing the embedded portion (102) of the sealing body (101) by being fitted into the recessed portion (107) for embedding. Alternatively, the embedded portion (102) of the seal body (101) may be bonded and fixed to the presser (51) with an adhesive, and the fixing method is not particularly limited. Although it does not specifically limit as an elastic member which comprises the said sealing body (101), For example, a hard rubber etc. are mentioned.

  FIG. 7 shows a cross-sectional view of a state in which the second support beam (2A) is sandwiched and pressed by the pressing tool (51). When the pair of split molds constituting the presser (51) are fastened, the protrusion (103) of the seal body (101) is the peripheral edge of the vent hole (110) in the outer peripheral wall of the second support beam (2A) Abut. At this time, the protrusion (103) is compressed by the peripheral edge of the vent hole (110) in the outer peripheral wall of the second support beam (2A) and is pushed toward the embedded recess (107). (See FIG. 7), the vent (110) can be sealed in a liquid-tight state. At the same time, the fitting convex portion (104) of the seal body (101) is inserted and arranged in the vent hole (110) of the second support beam (2A), thereby the vent hole (110). Can be closed in a liquid-tight state.

  Similarly to the pressing tool (51), the pressing tool (55) has a recessed portion for embedding (which is formed on the contact surface with the vent holes (112) and (113) of the first support beam (1A) ( 107) (107), and a sealing body made of an elastic member is fixed. These seal bodies have the same configuration as the seal body (101) fixed to the presser (51). In addition, as with the pressing tool (51), the pressing tool (59) is also provided with an embedded recess (107) formed on the contact surface with the vent hole (111) of the first support beam (1A). ) To which a sealing body made of an elastic member is fixed. These seal bodies have the same configuration as the seal body (101) fixed to the presser (51).

  In addition, arrangement | positioning of the pressing tools (52) (54) (58) which hold | suppress the said bracket (27) (30) and a connection member (3) is not essential. For example, when the brackets (27) (30) and the connecting member (3) have sufficient strength and rigidity against the internal pressure generated by applying a predetermined pressure to the fluid, the pressing tool (52) (54) The arrangement of (58) is not necessary. In addition, when the diameter of the first support beam (1A) and the diameter of the second support beam (2A) are extremely different, the required internal pressure (internal pressure necessary for expanding the diameter) is different. Further, the diameter may be expanded in a state where a restricting means for preventing excessive diameter expansion is arranged around the position to be expanded.

  Moreover, as shown in FIG. 4, the end part of the non-connection side of the first support beam (1A) is sealed in a liquid-tight state by a sealing tool (61). The sealing tool (61) has a substantially disk shape, and an elastic seal member (61A) is integrated on one surface thereof, and the elastic seal member (61A) is connected to the non-connecting side of the first support beam (1A). The end of the first support beam (1A) on the non-connecting side is loaded by applying an axial force from the outside to the inside of the sealing tool (61) in a state of being in contact with the opening surface of the end of the first support beam. Is sealed in a liquid-tight state.

  Further, as shown in FIG. 4, the end portion of the second support beam (2A) on the non-connecting side is sealed in a liquid-tight state by a sealing tool (62). The sealing tool (62) has a substantially disk shape, and an elastic seal member (62A) is integrated on one surface thereof, and the elastic seal member (62A) is connected to the non-connecting side of the second support beam (2A). The end of the second support beam (2A) on the non-connecting side is loaded by applying an axial force from the outside to the inside of the sealing tool (62) in a state of being in contact with the opening surface of the end of the second support beam. Is sealed in a liquid-tight state. The sealing tool (62) is formed with through holes (63) (63) penetrating in the thickness direction (see FIG. 4).

  After that, when a fluid such as water or oil is sealed in the second support beam (2A) through the through holes (63) and (63) of the sealing tool (62), the fluid is connected to the connecting member (3). It passes through the communicating hole (7) and is also enclosed in the first support beam (1A). Next, a predetermined pressure is applied to the fluid. Although a pressure is not specifically limited, Usually, it is the range of 5-70 MPa.

  When a predetermined pressure is applied to the fluid, that is, while the pressure from the outside to the inside is applied to the sealing devices (61) and (62), the pressing devices (51) (52) (53) (54) ), (55), (56), (57), (58), and (59), when a predetermined pressure is applied to the fluid while being restrained by applying an inward pressure from the outside, as shown in FIG. Further, a part of the end portions of both support beams (1A) and (2A) inserted and fitted into the connecting member (3) is expanded to form expanded diameter portions (11A) and (11B). The portion (11A) enters and locks into the receiving recess (9) on the inner peripheral surface of the second cylindrical portion (5), and the enlarged diameter portion (11B) is the first cylindrical portion (4). ) Enters and locks into the receiving recess (8) on the inner peripheral surface of the inner peripheral surface, and the mounting position of the connecting member (3) in the both support beams (1A) (2A) The peripheral portions on both sides expand to form expanded diameter portions (12A) and (12B), the connecting members (3) are sandwiched and fixed by the expanded diameter portions (12A) and (12B) on both sides, and the both support beams are further fixed. (1A) (2A) Mounting bracket fitting portions (22) (25) (28) (31) (34) (37) The peripheral portions on both sides of the mounting position are expanded in diameter, and the expanded diameter portion (13A) ( 13B), (14A), (14B), (15A), (15B), (16A), (16B), (17A), (17B), (18A), and (18B). Will be sandwiched and fixed.

  When the fluid pressure is applied, the fitting convex portion (104) of the seal body (101) of the presser (51) is compressed by the fluid pressure as shown in FIG. Since the peripheral side surface of the fitting convex portion (104) comes into contact with the inner peripheral wall surface of the vent hole (110) in a sufficiently liquid-tight state by being pushed toward (107), the ventilation Leakage of fluid from the mouth (110) can be prevented. Similarly, the fitting convex part (104) of the sealing body (101) of the pressing tool (55) is compressed by the fluid pressure and pushed toward the burying concave part (107), and the fitting convex part. Since the peripheral side surface of (104) comes into contact with the inner peripheral wall surface of the vent holes (112) and (113) in a sufficiently liquid-tight state, fluid leaks from the vent holes (112) and (113). Can be prevented. Similarly, the fitting convex part (104) of the seal body (101) of the pressing tool (59) is also compressed by the fluid pressure and pushed toward the burying concave part (107), and the fitting convex part. Since the peripheral side surface of (104) comes into contact with the inner peripheral wall surface of the vent (111) in a sufficiently liquid-tight state, leakage of fluid from the vent (111) can be prevented. . As described above, since the fluid pressure can be applied in a state where the vent holes (110), (111), (112), and (113) are sufficiently sealed by the seal body (101), the diameter expansion operation can be performed without any trouble. can do.

  Next, when the presser (51) (52) (53) (54) (55) (56) (57) (58) (59) and the sealing tool (61) (62) are removed, as shown in FIG. A steering support beam (10A) can be obtained.

  As the sealing body, for example, a configuration as shown in FIG. 10 can be adopted. The seal body (101B) includes an embedded portion (102) embedded in an embedded recess formed on an inner peripheral surface (contact surface with the second support beam) of the presser (51), and the embedded The presser (51) is connected to the part (102) and has a protruding part (103) protruding inward from the inner peripheral surface.

  Next, a modification of the first manufacturing method will be described with reference to FIG. In this manufacturing method, as shown in FIG. 11, the elastic tube material (cylindrical elastic member) (80) is arranged inside the both support beams (1A) (2A) along the inner peripheral surface. Except that the fluid is enclosed in both the support beams (1A) and (2A) and a predetermined pressure is applied to the fluid, the operation is performed in the same manner as in the first manufacturing method to expand the diameter. To do. In this manufacturing method, since a predetermined pressure is applied to the elastic tube member (80) via a fluid, the diameter can be sufficiently expanded. Although it does not specifically limit as said elastic tube material (80), Hard rubber is suitable.

  In the first production method, the fluid is not particularly limited, and examples thereof include water and oil.

  1st invention WHEREIN: Although the width (W) of the said enlarged diameter part (11-18) is not specifically limited, It is preferable to set to 5-30 mm. Moreover, it is preferable that the widths of these enlarged diameter portions are all set to the same width. Moreover, although the deformation amount (expansion amount) (h) of the said enlarged diameter part (11-18) is not specifically limited, It is preferable to set to 0.5-3 mm.

  The outer diameters of the first support beam (1A) and the second support beam (2A) are preferably set to 60 to 100 mm (particularly when the support beam is made of an aluminum material, this range is set). Is good). The thickness of the first support beam (1A) and the second support beam (2A) is preferably set to 1.5 to 5 mm (especially when the support beam is made of an aluminum material). Set to a range).

  In the above embodiment, the support beams (1A) and (2A) have an elliptical cross section. However, the support beams (1A) and (2A) are not particularly limited to such a shape. For example, the cross section is a quadrangle, pentagon, or hexagon. Further, it may be formed in a polygonal shape such as an octagon or other irregular cross-sectional shapes. In particular, the support beams (1A) and (2A) are preferably formed to have an elliptical or polygonal cross section. In this case, the connecting member (3) and the fitting portion of the mounting bracket are fixed. There is an advantage that it is possible to reliably prevent these from rotating in the circumferential direction of the support beams (1A) (2A). For example, when the support beams (1A) and (2A) have a polygonal cross section, the fitting portion of the mounting bracket and the first and second cylindrical portions (4) and (5) of the connecting member (3). ) May be configured in a polygonal shape that can be externally fitted to the support beams (1A) and (2A) having a polygonal cross section. The same applies to the case where the support beams (1A) and (2A) are formed in other irregular cross-sectional shapes. In addition, when adopting a polygonal cross section as the support beams (1A) and (2A), it is preferable to make the corners substantially arcuate (round) without making the corners square. This can sufficiently prevent the occurrence of cracks during diameter expansion.

  The means for preventing the connecting member (3) and the mounting bracket fitting portion from rotating in the circumferential direction of the support beam (1A) (2A) when the fitting portion is fixed is described above. In addition to the configuration, for example, a concave groove extending in the axial direction is formed on the inner peripheral surface of the connecting member (3) or the mounting bracket fitting portion (22) (25) (28) (31) (34) (37). And applying a predetermined pressure to the fluid to enlarge the corresponding positions of the concave grooves in the first support beam (1A) and the second support beam (2A) to form an enlarged diameter portion, Examples include a configuration in which the expanded diameter portion is inserted into the concave groove of the connecting member or the mounting bracket fitting portion (see Japanese Patent Application Laid-Open No. 7-116751).

  Moreover, in the said embodiment, although the structure which consists of an injection molding material of resin (FRP is also included) is employ | adopted for the connection member (3), it is not specifically limited to such a structure, For example, extrusion material , Casting (Mg casting, etc.), forging, sheet metal press (iron sheet metal, etc.), casting (cast iron, etc.), extrusion + cutting.

  In the above embodiment, the first support beam (1A), the second support beam (2A), and the mounting brackets (21) (24) (27) (30) (33) (36) are all extruded materials. Although the structure which consists of is employ | adopted, it is not limited to such a structure in particular. For example, the first support beam (1A), the second support beam (2A), and the mounting brackets (21) (24) (27) (30) (33) (36) are injection molded of resin (including FRP). It may be formed of a material. Further, the first support beam (1A) and the second support beam (2A) may be formed of iron or copper, or may be formed of an electric-welded tube of aluminum or iron. Mounting brackets (21) (24) (27) (30) (33) (36) are cast (Mg casting, etc.), forging, sheet metal press (iron sheet metal, etc.), casting (cast iron, etc.), extrusion + cutting May be formed.

  The extruded material is preferably an extruded material made of a light metal or an alloy thereof. Among them, the extruded material is particularly preferably an aluminum extruded material, and in this case, excellent productivity can be secured while maintaining excellent lightness. Examples of the aluminum extruded material include 5000 series, 6000 series, and 7000 series.

  Alternatively, the extruded material is preferably a synthetic resin extruded material, and in this case, excellent productivity can be secured while maintaining excellent lightness.

  Further, for example, the mounting brackets (21) (24) (27) (30) (33) (36) are made of iron sheet metal, and the first support beam (1A) and the second support beam (2A). May be made of an extruded aluminum material. In this case, it is necessary to design a caulking allowance by sufficiently considering a decrease in caulking strength due to a difference in thermal expansion coefficient between materials.

  The fitting portions (22) (25) (28) (31) (34) (37) of the mounting brackets (21) (24) (27) (30) (33) (36) are spaces inside thereof. The shape is not particularly limited as long as the support beam is inserted into the support beam and can be fitted onto the support beam. That is, the fitting portions (22), (25), (28), (31), (34), and (37) of the mounting bracket do not separate (do not come off) outward in the state of being fitted on the support beam. If it is a shape, it will not specifically limit. For example, the fitting portions (22), (25), (28), (31), (34), and (37) of the mounting bracket may be formed in a cylindrical shape having an elliptical cross section as in the above embodiment. Or the opening part may be provided in a part of circumferential direction of the fitting part (22) (25) (28) (31) (34) (37) of a bracket.

  Note that the fitting portions (22) (25) (28) (31) of the mounting brackets (21) (24) (27) (30) (33) (36) are attached to the support beams (1A) (2A). ) (34) When the (37) is externally fitted, the clearance (gap between the support beam and the fitting portion) should be small, and the clearance is designed to be 0.2 to 0.3 mm. However, it is not particularly limited to such a range.

  Next, an embodiment of the steering support beam (10B) according to the second invention is shown in FIGS. The steering support beam (10B) of the present embodiment is a steering support beam for an automobile that is disposed between the left and right front pillars of the automobile body and is connected and fixed to these front pillars. 13 and 14, (1B) is a first support beam, (2B) is a second support beam, and (21) (24) (27) (30) (33) (36) are mounting brackets.

  Each of the first support beam (1B) and the second support beam (2B) is made of a cylindrical extruded material having an elliptical cross section. The second support beam (2B) has an inner diameter larger than the outer diameter of the first support beam (1B), and is disposed on the driver's seat side. On the other hand, the first support beam (1B) is disposed on the passenger seat side.

  As shown in FIGS. 13 and 14, the front pillar mounting side bracket (21) includes a fitting portion (22) having an elliptical cross section that can be fitted onto the second support beam (2 B), and the fitting portion ( 22) and an attachment portion (23) extending outward. Further, as shown in FIGS. 13 and 14, the other front pillar mounting side bracket (24) includes a fitting portion (25) having an elliptical cross section that can be externally fitted to the first support beam (1B), It consists of an attachment part (26) extended outward from this fitting part (25).

  As shown in FIGS. 13 and 14, the column mounting bracket (27) includes a fitting portion (28) having an elliptical cross section that can be externally fitted to the second support beam (2 B), and the fitting portion (28). And an attachment portion (29) projecting outward from the outer peripheral surface of the.

  As shown in FIGS. 13 and 14, the airbag unit mounting bracket (30) includes a fitting portion (31) having an elliptical cross section that can be externally fitted to the first support beam (1 B), and the fitting portion ( 31) and an attachment portion (32) projecting outward from the outer peripheral surface.

  As shown in FIGS. 13 and 14, the audio mounting bracket (33) includes a fitting portion (34) having an elliptical cross section that can be fitted on the first support beam (1 B), and the fitting portion (34). And an attachment portion (35) extended outward.

  As shown in FIGS. 13 and 14, the glove box mounting bracket (36) includes a fitting portion (37) having an elliptical cross section that can be fitted onto the first support beam (1B), and the fitting portion (37). ) And an attachment portion (38) extending outward.

  The mounting brackets (21) (24) (27) (30) (33) (36) are all made of extruded material.

  Accordingly, a part (right end) of one end side of the first support beam (1B) is inserted and arranged in the second support beam (2B). In the present embodiment, a configuration is adopted in which the first support beam (1B) is inserted and disposed over the entire length in the length direction inside the second support beam (2B) (see FIG. 14).

  The fitting portion (22) of the front pillar mounting side bracket (21) is fitted on the outer peripheral surface of the right end portion of the second support beam (2B), and the fitting in the second support beam (2B). The peripheral portions on the left and right sides of the joint portion (22) are expanded to form second expanded portions (43A) and (43B) extending in the circumferential direction. These second expanded portions (outside expanded portions) ( 43A) and 43B, the fitting portion (22) of the side bracket (21) is sandwiched and fixed so that the side bracket (21) is in a stable state with respect to the second support beam (2B). And it is firmly fixed (see FIG. 14).

  Further, the fitting portion (28) of the column mounting bracket (27) is fitted on the outer peripheral surface of the center portion of the second support beam (2B), and the fitting in the second support beam (2B) is performed. The diameters of the left and right sides of the mounting portion (28) are expanded to form second expanded portions (outside expanded portions) (45A) and (45B) extending in the circumferential direction. These second expanded portions (45A) ) (45B), the fitting portion (28) of the column mounting bracket (27) is sandwiched and fixed so that the column mounting bracket (27) is fixed to the second support beam (2B). It is firmly fixed in a stable state.

  The first expanded diameter formed by expanding the corresponding region of the second expanded portion (outside expanded portion) (43A) (43B) (45A) (45B) in the first support beam (1B). The portion (inner diameter enlarged portion) (41A) (41B) (42A) (42B) is a second diameter enlarged portion (outer diameter enlarged portion) (43A) (43B) (45A) of the second support beam (2B). The first support beam (1B) and the second support beam (2B) are connected and fixed by entering and locking into the inner recess of (45B) (see FIG. 14).

  In addition, a fitting portion (25) of a side pillar (24) for mounting a front pillar is fitted on the outer peripheral surface of the left end portion of the first support beam (1B), and the first support beam (1B) The left and right peripheral portions of the fitting portion (25) mounting position are expanded in diameter to form third expanded portions (44A) (44B) extending in the circumferential direction, and these third expanded portions (44A) (44B). ), The fitting portion (25) of the side bracket (24) is sandwiched and fixed so that the side bracket (24) is fixed to the first support beam (1B) in a stable state and firmly. (See FIG. 14).

  Further, the airbag unit mounting bracket (30) is fitted to the outer peripheral surface of the substantially central portion of the region (non-covered region) that is not covered with the second support beam (2B) in the first support beam (1B). As the portion (31) is externally fitted, and the left and right side peripheral portions of the fitting portion (31) mounting position in the first support beam (1B) are expanded in diameter, the third expanded diameter portion (46A in the circumferential direction) ) (46B) is formed, and the fitting portion (31) of the bracket for mounting the airbag unit (30) is sandwiched and fixed between the third enlarged diameter portions (46A) (46B). A bag unit mounting bracket (30) is firmly and firmly fixed to the first support beam (1B).

  Further, a fitting portion (33) of the audio mounting bracket (33) is provided on the outer peripheral surface of the substantially central portion of the region (non-covered region) that is not covered with the second support beam (2B) in the first support beam (1B). 34) is externally fitted, and the left and right peripheral portions of the fitting portion (34) mounting position in the first support beam (1B) are enlarged in diameter so that the third enlarged diameter portion (47A) ( 47B) is formed, and the fitting portion (34) of the audio mounting bracket (33) is sandwiched and fixed between the third enlarged diameter portions (47A) and (47B), whereby the audio mounting bracket ( 33) is firmly fixed to the first support beam (1B) in a stable state.

  Furthermore, the fitting portion of the glove box mounting bracket (36) on the outer peripheral surface of the substantially central portion of the region (non-covered region) that is not covered with the second support beam (2B) in the first support beam (1B). (37) is fitted externally, and the left and right sides of the fitting portion (37) mounting position of the first support beam (1B) are expanded in diameter so that the third diameter-expanded portion (48A) extends in the circumferential direction. (48B) is formed, and the fitting portion (37) of the bracket (36) for attaching the glove box is sandwiched and fixed between the third enlarged diameter portions (48A) and (48B), thereby attaching the glove box. A bracket (36) is fixed in a stable state and firmly to the first support beam (1B).

  In this manner, the mounting brackets (21), (24), (27), (30), (33), and (36) are all securely fixed to the support beam in a stable state.

  Further, as shown in FIGS. 13 and 14, the mounting side bracket (21) mounting position and the column mounting bracket (27) on the outer peripheral wall of the second support beam (2B) and the first support beam (1B). An opening is provided in each of the regions between the mounting positions, thereby forming a vent (120). In addition, vent holes (122) and (123) are formed in the central region of the outer peripheral wall of the first support beam (1B). A vent hole (121) is formed in a region between the mounting position of the airbag unit mounting bracket (30) and the mounting side bracket (24) mounting position on the outer peripheral wall of the first support beam (1B). ing. The steering support beam (10B) of this embodiment combines the functions of an air conditioner duct, and the vents (120), (121), (122), and (123) function as vent holes of the air conditioner duct. It is. The vents (120), (121), (122), and (123) are not particularly limited, and are formed by, for example, press working or machining.

  The steering support beam (10B) according to the above configuration is manufactured as follows, for example. The second manufacturing method using fluid pressure will be described with reference to FIGS.

  First, a first support beam (1B) made of a cylindrical extruded material having an elliptical cross section and a second support beam (2B) made of a cylindrical extruded material having an inner diameter larger than the outer diameter of the first support beam (1B). Prepare.

  Two vent holes (122) and (123) are formed in the central region of the outer peripheral wall of the first support beam (1B), while one vent hole (131) is formed at one end of the first support beam (1B). ) Is formed. In addition, openings are formed in the other end portions of the outer peripheral walls of the first support beam (1B) and the second support beam (2B), respectively, thereby forming a vent (120) (see FIG. 15, 16).

  As shown in FIG. 15 (a), a fitting portion (28) of a column mounting bracket (27) is externally fitted to the outer peripheral surface of the central portion of the second support beam (2B), and the second support The fitting portion (22) of the front pillar mounting side bracket (21) is externally fitted to the outer peripheral surface of the right end portion of the beam (2B).

  Next, as shown in FIG. 15 (b), the remaining portions of the outer peripheral surface of the second support beam (2B) other than the left and right peripheral portions of the mounting bracket fitting portions (22) and (28) are left and right. It is held in a state where it is sandwiched between and pressed by pressers (51) and (53) made of split molds. Further, the outer side of the column mounting bracket (27) is held in a state of being sandwiched and pressed by a pressing tool (52) made of a split mold that can be divided into left and right. In addition, arrangement | positioning of the pressing tool (52) which presses down the attachment bracket (27) is not essential. For example, when the mounting bracket (27) has sufficient strength and rigidity against the internal pressure generated by applying a predetermined pressure to the fluid, the placement of the pressing tool (52) is unnecessary.

  The retainers (51) and (53) are split molds that can be divided into right and left parts, and the inner peripheral surfaces of these split molds are formed in an inner peripheral surface shape that matches the outer peripheral surface of the second support beam (2B). ing.

  As shown in FIGS. 17 and 20, one split mold of the presser (51) is formed on the contact surface of the presser (51) with the vent (120) of the second support beam (2B). The sealing body (131) made of an elastic member is fixed to the embedded recess (137). The seal body (131) includes an embedded portion (132) embedded in an embedded recess (137) formed on an inner peripheral surface (a contact surface with the second support beam) of the presser (51). The protrusion (133) connected to the embedded portion (132) and protruded inward from the inner peripheral surface of the presser (51), and connected to the protrusion (133) and the vent ( 120), and a fitting convex part (134) having substantially the same shape and the same size. The protrusion (133) is formed in such a size that the peripheral edge thereof can abut on the peripheral edge of the vent (120) in the outer peripheral wall of the second support beam (2B). It is preferable that the fitting projection (134) has a substantially similar shape in plan view, the diameter of which is reduced by 0.2 to 0.5 mm inward from the opening size of the vent (120). Further, the peripheral side surface of the fitting convex portion (134) has a taper that decreases in diameter toward the distal end side of the convex portion (134) so that the insertion operation into the vent hole (120) can be performed more smoothly. It may be formed on the surface. The sealing body (131) is fixed to the presser (51) by fixing the embedded portion (132) of the sealing body (131) by being fitted into the recessed portion (137) for embedding. Alternatively, the embedded portion (132) of the seal body (131) may be bonded and fixed to the pressing tool (51) with an adhesive, and the fixing method is not particularly limited. Although it does not specifically limit as an elastic member which comprises the said sealing body (131), For example, a hard rubber etc. are mentioned.

  FIG. 18A shows a cross-sectional view of the state in which the second support beam (2B) is sandwiched and pressed by the pressing tool (51). When the pair of split molds constituting the presser (51) are fastened, the projecting portion (133) of the seal body (131) is the peripheral portion of the vent hole (120) in the outer peripheral wall of the second support beam (2B). Abut. At this time, the protrusion (133) is compressed by the peripheral edge of the vent (120) in the outer peripheral wall of the second support beam (2B) and is pushed toward the embedded recess (137). From FIG. 18 (a), the vent (120) can be sealed in a liquid-tight state. At the same time, since the fitting convex part (134) of the seal body (131) is inserted and arranged in the vent hole (120) of the second support beam (2B), this allows the vent hole (120). Can be closed in a liquid-tight state.

  Moreover, as shown in FIG.15 (b), the left end part of a 2nd support beam (2B) is sealed in a liquid-tight state with a sealing tool (61). The sealing tool (61) has a substantially disk shape, and an elastic seal member (61A) is integrated on one surface thereof, and the elastic seal member (61A) is connected to the right end of the second support beam (2B). The left end of the second support beam (2B) is sealed in a liquid-tight state by applying an axial force from the outside to the inside of the sealing tool (61) in a state of being in contact with the opening surface of the second support beam (61). Stop.

  Further, as shown in FIG. 15 (b), the right end of the second support beam (2B) is sealed in a liquid-tight state by a sealing tool (62). The sealing tool (62) has a substantially disk shape, and an elastic seal member (62A) is integrated on one surface thereof, and the elastic seal member (62A) is connected to the left end of the second support beam (2B). The right end of the second support beam (2B) is sealed in a liquid-tight state by applying an axial force from the outside to the inside of the sealing tool (62) in contact with the opening surface of the second support beam. Stop. The sealing tool (62) is formed with through holes (63) (63) penetrating in the thickness direction.

  Thereafter, a fluid such as water or oil is sealed in the second support beam (2B) through the through holes (63) (63) of the sealing tool (62), and a predetermined pressure is applied to the fluid. Add Although a pressure is not specifically limited, Usually, it is the range of 5-70 MPa.

  When a predetermined pressure is applied to the fluid, that is, while applying pressure from the outside to the inside of the sealing device (61) (62), the pressing device (51) (52) (53) is applied. When a predetermined pressure is applied to the fluid in a restrained state by applying pressure from the outside to the inside, as shown in FIG. 15 (c), the mounting bracket fitting in the second support beam (2B) is fitted. The left and right sides of the joint portion (22) and (28) are expanded in diameter to form second enlarged portions (43A), (43B), (45A), and (45B). The mounting bracket fitting portions (22) and (28) are sandwiched and fixed by (43A), (43B), (45A), and (45B).

  When the fluid pressure is applied, the fitting convex part (134) of the seal body (131) of the presser (51) is compressed by the fluid pressure and embedded as shown in FIG. 18 (b). Since it is pushed toward the concave recess (137), the peripheral side surface of the fitting convex portion (134) comes into contact with the inner peripheral wall surface of the vent (120) in a sufficiently liquid-tight state. , Leakage of fluid from the vent (120) can be prevented. As described above, since the fluid pressure can be applied in a state where the vent hole (120) is sufficiently sealed by the seal body (131), the diameter expansion operation can be performed without any trouble. The steps shown in FIGS. 15A, 15B and 15C and FIGS. 18A and 18B are the first step.

  Next, after removing the sealing tool (61), as shown in FIG. 16 (a), a part of one end side of the first support beam (1B) is placed inside the second support beam (2B). Insert and place. Further, a fitting portion of the mounting brackets (24), (30), (33), and (36) in a region (non-covered region) that is not covered with the second support beam (2B) in the first support beam (1B). (25) (31) (34) (37) are externally fitted. That is, as shown in FIG. 16 (a), the fitting portion (34) of the audio mounting bracket (33) and the glove box are provided on the outer peripheral surface of the substantially central portion of the uncovered region of the first support beam (1B). The fitting portion (37) of the mounting bracket (36) is externally fitted. Further, the fitting portion (31) of the airbag unit mounting bracket (30) is externally fitted to the outer peripheral surface of the first support beam (1B) at a position close to the right end side from the substantially central portion of the uncovered region. To do. Further, the fitting portion (25) of the front pillar mounting bracket (24) is externally fitted to the outer peripheral surface of the left end portion of the first support beam (1B).

  Further, as shown in FIG. 16 (a), mounting bracket fitting portions (22) (25) (28) (31) (34) (37) on the outer peripheral surfaces of the both support beams (1B) (2B). The remaining portions excluding the left and right sides of the left and right sides are held in a state where they are sandwiched and pressed by pressers (51), (53), (55), (56), (57), and (59) that are split molds that can be divided into left and right sides. Furthermore, the outside of the column mounting bracket (27) can be held in a state where it is sandwiched and pressed by a split-type presser (52) that can be divided into left and right parts, and the outside of the airbag unit mounting bracket (30) can be divided into left and right parts. It is held in a state of being sandwiched and pressed by a pressing tool (58) made of a split mold (see FIG. 16 (a)). The pressers (55), (56), (57), and (59) are split molds that can be divided into left and right parts, and the inner peripheral surfaces of these split molds are adapted to the outer peripheral surface of the first support beam (1B). It is formed in a circumferential shape. In addition, arrangement | positioning of the pressing tools (52) (58) which hold | suppress the mounting bracket (27) (30) is not essential. For example, when the mounting brackets (27) and (30) have sufficient strength and rigidity against the internal pressure generated by applying a predetermined pressure to the fluid, the holding tools (52) and (58) No arrangement is necessary.

  FIG. 19A shows a cross-sectional view of a state in which the second support beam (2B) is sandwiched and pressed by the pressing tool (51). When the pair of split molds constituting the presser (51) are fastened, the projecting portion (133) of the seal body (131) is the peripheral portion of the vent hole (120) in the outer peripheral wall of the second support beam (2B). Abut. At this time, the protrusion (133) is compressed by the peripheral edge of the vent (120) in the outer peripheral wall of the second support beam (2B) and is pushed toward the embedded recess (137). From FIG. 19A, the vent (120) can be sealed in a liquid-tight state. At the same time, the fitting convex portion (134) of the seal body (131) is inserted and disposed in the vent hole (120) of the second support beam (2B), thereby the vent hole (120). Can be closed in a liquid-tight state.

  Similarly to the pressing tool (51), the pressing tool (55) has a recessed portion for embedding (which is formed on the contact surface with the vent holes (122) and (123) of the first support beam (1B)). 137) and 137), respectively, and a sealing body made of an elastic member is fixed. These seal bodies have the same configuration as the seal body (131) fixed to the presser (51). Further, as with the pressing tool (51), the pressing tool (59) is also provided with a buried recess (137) formed on the contact surface with the vent hole (121) of the first support beam (1B). ) To which a sealing body made of an elastic member is fixed. These seal bodies have the same configuration as the seal body (131) fixed to the pressing tool (51).

Furthermore, as shown in FIG. 16 (a), the right end of the second support beam (2B) is sealed in a liquid-tight state by a sealing tool (62), and the first support beam (1B) After sealing the left end in a liquid-tight state with the sealing tool (61), the first support beam (1B) is inserted into the first supporting beam (1B) through the through holes (63) and (63) of the sealing tool (62). A fluid such as water or oil is sealed, and a predetermined pressure is applied to the fluid. Although a pressure is not specifically limited, Usually, it is the range of 5-70 MPa.

  When a predetermined pressure is applied to the fluid, that is, while the pressure from the outside to the inside is applied to the sealing device (61) (62), the pressing device (51) (52) (53) (55) ), (56), (57), (58), and (59), when a predetermined pressure is applied to the fluid in a state of being restrained by applying an inward pressure from the outside, as shown in FIG. In addition, the corresponding region of the second expanded diameter portions (43A), (43B), (45A), and (45B) in the first support beam (1B) is expanded, and the first expanded diameter portions (41A) (41B) (42A) ) (42B), and the first enlarged diameter portions (41A) (41B) (42A) (42B) are the second enlarged diameter portions (43A) (43B) (45A) of the second support beam (2). (45B) enters and locks into the inner recess of the first support beam (1B). The mounting bracket fitting portions (25), (31), (34), and (37) in the left and right sides of the mounting position of the mounting bracket are increased in diameter to form third expanded portions (44A) (44B) (46A) (46B) ( 47A), (47B), (48A), and (48B) are formed, and the mounting is performed by the third enlarged diameter portions (44A), (44B), (46A), (46B), (47A), (47B), (48A), and (48B) on both sides. The bracket fitting portions (25), (31), (34), and (37) are sandwiched and fixed.

  When the fluid pressure is applied, the fitting convex portion (134) of the seal body (131) of the presser (51) is compressed by the fluid pressure and embedded as shown in FIG. 19 (b). Since it is pushed toward the concave recess (137), the peripheral side surface of the fitting convex portion (134) comes into contact with the inner peripheral wall surface of the vent (120) in a sufficiently liquid-tight state. , Leakage of fluid from the vent (120) can be prevented. Similarly, the fitting convex part (134) of the seal body (131) of the pressing tool (55) is compressed by fluid pressure and pushed toward the burying concave part (137), and the fitting convex part. Since the peripheral side surface of (134) comes into contact with the inner peripheral wall surface of the vent holes (122) and (123) in a sufficiently liquid-tight state, fluid leaks from the vent holes (122) and (123). Can be prevented. Similarly, the fitting convex portion (134) of the seal body (131) of the pressing tool (59) is also compressed by the fluid pressure and pushed toward the embedded concave portion (137), and the fitting convex portion. Since the peripheral side surface of (134) comes into contact with the inner peripheral wall surface of the vent hole (121) in a sufficiently liquid-tight state, fluid leakage from the vent hole (121) can be prevented. . Thus, since the fluid pressure can be applied in a state where the vent holes (120), (121), (122), and (123) are sufficiently sealed by the seal body (131), the diameter expansion operation can be performed without any trouble. can do. The process shown in FIGS. 16A and 16B and FIGS. 19A and 19B is the second process.

  Next, if the presser (51) (52) (53) (55) (56) (57) (58) (59) and the sealing tool (61) (62) are removed and the fluid is removed, FIG. , 14, the steering support beam (10B) is obtained.

  As the sealing body, for example, a configuration as shown in FIG. 21 can be adopted. The seal body (131B) includes an embedded portion (132) embedded in an embedded recessed portion formed on an inner peripheral surface (contact surface with the second support beam) of the presser (51), The presser (51) includes a projecting portion (133) projecting inward from the inner peripheral surface while being connected to the portion (132).

  Next, a modification of the second manufacturing method will be described with reference to FIGS. In this manufacturing method, as shown in FIGS. 22B and 22C and FIGS. 23A and 23B, the elastic tube material (in the form along the inner peripheral surface inside the both support beams 1B and 2B) ( Except for the operation of applying a predetermined pressure to the fluid by enclosing the fluid inside the support beams (1B) and (2B) with the cylindrical elastic member) (80) disposed, The diameter is expanded by performing the same operation as in the second manufacturing method. In this manufacturing method, since a predetermined pressure is applied to the elastic tube member (80) via a fluid, the diameter can be sufficiently expanded. Although it does not specifically limit as said elastic tube material (80), Hard rubber is suitable.

  In the second production method, the fluid is not particularly limited, and examples thereof include water and oil.

  In the second invention, the first diameter-expanded portion (41) (42), the second diameter-expanded portion (43) (45) and the third diameter-expanded portion (44) (46) (47) (48) The width (W) is not particularly limited, but is preferably set to 5 to 30 mm. Moreover, it is preferable that the widths of these enlarged diameter portions are all set to the same width. Moreover, although the deformation amount (expansion amount) (h) of the said enlarged diameter part (41-48) is not specifically limited, It is preferable to set to 0.5-3 mm.

  The outer diameters of the first support beam (1B) and the second support beam (2B) are preferably set to 60 to 100 mm (particularly when the support beam is made of an aluminum material, this range is set). Is good). The thickness of the first support beam (1B) and the second support beam (2B) is preferably set to 1.5 to 5 mm (especially when the support beam is made of an aluminum material). Set to a range).

  In the above embodiment, the support beams (1B) and (2B) have an elliptical cross section. However, the support beams (1B) and (2B) are not particularly limited to such a shape. For example, the cross section is a quadrangle, pentagon, or hexagon. Further, it may be formed in a polygonal shape such as an octagon or other irregular cross-sectional shapes. Among them, the support beams (1B) and (2B) are preferably formed to have an oval or polygonal cross section. In this case, when the fitting portion of the mounting bracket is fixed, these support beams ( 1B) There is an advantage that the rotational movement in the circumferential direction of (2B) can be surely prevented. For example, when the support beams (1B) and (2B) have a polygonal cross section, the fitting portion of the mounting bracket is a polygon that can be externally fitted to the support beams (1B) and (2B) having a polygonal cross section. What is necessary is just to comprise in a shape. The same applies when the support beams (1B) and (2B) are formed in other irregular cross-sectional shapes. In addition, when adopting a cross-sectional polygonal shape as the support beams (1B) and (2B), it is preferable to make the corners substantially arc-shaped (round) without making the corners square. This can sufficiently prevent the occurrence of cracks during diameter expansion.

  In addition to the above-described configuration, for example, the means for preventing these mounting brackets from rotating in the circumferential direction of the support beams (1B) (2B) when the fitting portion of the mounting bracket is fixed may be, for example, A concave groove extending in the axial direction is formed on the inner peripheral surface of the mounting bracket fitting portion (22) (25) (28) (31) (34) (37), and a predetermined pressure is applied to the fluid. By adding, the corresponding positions of the concave grooves in the first support beam (1B) and the second support beam (2B) are enlarged to form an enlarged diameter portion, and the enlarged diameter portion is formed on the mounting bracket fitting portion. Examples include a configuration in which the groove is inserted and locked (see Japanese Patent Application Laid-Open No. 7-116751).

  In the above embodiment, the first support beam (1B), the second support beam (2B), and the mounting brackets (21) (24) (27) (30) (33) (36) are all extruded materials. Although the structure which consists of is employ | adopted, it is not limited to such a structure in particular. For example, the first support beam (1B), the second support beam (2B), and the mounting brackets (21) (24) (27) (30) (33) (36) are injection molded of resin (including FRP). It may be formed of a material. In addition, the first support beam (1B) and the second support beam (2B) may be formed of iron or copper, or may be formed of an electric-welded tube of aluminum or iron. Mounting brackets (21) (24) (27) (30) (33) (36) are cast (Mg casting, etc.), forging, sheet metal press (iron sheet metal, etc.), casting (cast iron, etc.), extrusion + cutting May be formed.

  The extruded material is preferably an extruded material made of a light metal or an alloy thereof. Among them, the extruded material is particularly preferably an aluminum extruded material, and in this case, excellent productivity can be secured while maintaining excellent lightness. Examples of the aluminum extruded material include 5000 series, 6000 series, and 7000 series.

  Alternatively, the extruded material is preferably a synthetic resin extruded material, and in this case, excellent productivity can be secured while maintaining excellent lightness.

  Further, for example, the mounting brackets (21) (24) (27) (30) (33) (36) are made of iron sheet metal, and the first support beam (1B) and the second support beam (2B). May be formed of an aluminum extruded material. In this case, it is necessary to design a caulking allowance by sufficiently considering a decrease in caulking strength due to a difference in thermal expansion coefficient between materials.

  The fitting portions (22) (25) (28) (31) (34) (37) of the mounting brackets (21) (24) (27) (30) (33) (36) are spaces inside thereof. The shape is not particularly limited as long as the support beam is inserted into the support beam and can be fitted onto the support beam. That is, the fitting portions (22), (25), (28), (31), (34), and (37) of the mounting bracket do not separate (do not come off) outward in the state of being fitted on the support beam. If it is a shape, it will not specifically limit. For example, the fitting portions (22), (25), (28), (31), (34), and (37) of the mounting bracket may be formed in a cylindrical shape having an elliptical cross section as in the above embodiment. Or the opening part may be provided in a part of circumferential direction of the fitting part (22) (25) (28) (31) (34) (37) of a bracket.

  Note that the fitting portions (22), (25), (28), and (31) of the mounting brackets (21), (24), (27), (30), (33), and (36) are attached to the support beams (1B) and (2B). ) (34) When (37) is externally fitted, the clearance (the gap between the support beam and the fitting portion) should be small, and the clearance is designed to be 0.2 to 0.3 mm. However, it is not particularly limited to such a range.

  The steering support beam according to the present invention is used by being installed between the left and right of a vehicle body such as an automobile.

It is a perspective view which shows one Embodiment of the steering support beam which concerns on 1st invention. It is an end view of the XX line in FIG. It is sectional drawing which shows the bracket arrangement | positioning process in the 1st manufacturing method concerning this invention. It is sectional drawing which shows the pressing tool arrangement | positioning process in the 1st manufacturing method which concerns on this invention. It is sectional drawing which shows the fluid pressure load process (state which added fluid pressure) in the 1st manufacturing method which concerns on this invention. It is sectional drawing which shows the state immediately before arrange | positioning the said pressing tool (51). It is sectional drawing in the pressing tool (51) position in the said pressing tool arrangement | positioning process (FIG. 4) (a cutting position is a position equivalent to the DD line in FIG. 4). It is sectional drawing in the presser tool (51) position in the said fluid pressure loading process (FIG. 5) (a cutting position is a position equivalent to the EE line in FIG. 5). It is a perspective view which shows the said pressing tool and a sealing body in a separated state. It is sectional drawing which shows the other example of a pressing tool. It is sectional drawing which shows the other example of the 1st manufacturing method which concerns on this invention, (a) shows the state before pressurization, (b) shows the state at the time of pressurization, respectively. It is a figure which shows the modification of the attachment aspect to the vehicle floor surface of the steering support beam of this invention. It is a perspective view which shows one Embodiment of the steering support beam which concerns on 2nd invention. It is sectional drawing of the YY line in FIG. It is sectional drawing which shows an example of the 1st process of the 2nd manufacturing method which concerns on this invention, (a) is the state which has arrange | positioned the bracket with respect to the 2nd support beam, (b) is the state which has arrange | positioned the pressing tool further, (C) shows the state which applied the fluid pressure, respectively. It is sectional drawing which shows an example of the 2nd process of the 2nd manufacturing method which concerns on this invention, (a) is the state which inserted the one end part of the 1st support beam in the 2nd support beam, and has arrange | positioned the bracket and the pressing tool. , (B) shows the state where fluid pressure is applied. It is sectional drawing which shows the state immediately before arrange | positioning the said pressing tool (51). (A) is sectional drawing in the position of the pressing tool (51) in the said pressing tool arrangement | positioning process (FIG.15 (b)) (a cutting position is a position equivalent to the FF line in FIG.15 (b)), ( b) is a sectional view at the position of the presser (51) in the fluid pressure loading step (FIG. 15C) (the cutting position is a position corresponding to the line GG in FIG. 15C). (A) is sectional drawing in the position of the pressing tool (51) in the said pressing tool arrangement | positioning process (FIG. 16 (a)) (a cutting position is a position equivalent to the HH line in FIG. 16 (a)), ( b) is a sectional view at the position of the presser (51) in the fluid pressure loading step (FIG. 16B) (the cutting position is a position corresponding to the line JJ in FIG. 16B). It is a perspective view which shows the said pressing tool and a sealing body in a separated state. It is sectional drawing which shows the other example of a pressing tool. It is sectional drawing which shows the 1st process of the other example of the 2nd manufacturing method which concerns on this invention, (a) is the state which has arrange | positioned the bracket with respect to the 2nd support beam, (b) has further arrange | positioned the pressing tool. A state and (c) show the state which added fluid pressure, respectively. It is sectional drawing which shows the 2nd process of the other example of the 2nd manufacturing method which concerns on this invention, (a) inserts the one end part of a 1st support beam in a 2nd support beam, and arrange | positions a bracket and a pressing tool. (B) shows a state where fluid pressure is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A ... 1st support beam 1B ... 1st support beam 2A ... 2nd support beam 2B ... 2nd support beam 3 ... Connection member 4 ... 1st cylindrical part 5 ... 2nd cylindrical part 6 ... Connection plate part 7 ... Communication Hole 8 ... Receiving recess 9 ... Receiving recess 10A ... Steering support beam 10B ... Steering support beam 11 ... Expanded diameter portion 12-18 ... Expanded diameter portion 19 ... Center stay (elongate fixed protruding piece)
DESCRIPTION OF SYMBOLS 21 ... Side bracket for attachment 22 ... Fitting part 24 ... Side bracket for attachment 25 ... Fitting part 27 ... Bracket for column attachment 28 ... Fitting part 30 ... Bracket for airbag unit attachment 31 ... Fitting part 33 ... Audio attachment Bracket 34 ... Fitting part 36 ... Glove box mounting bracket 37 ... Fitting part 40 ... Fixing protruding piece 41, 42 ... First enlarged diameter part (inner enlarged diameter part)
43, 45 ... 2nd diameter expansion part (outside diameter expansion part)
44, 46, 47, 48 ... 3rd enlarged diameter part 51-59 ... Presser 80 ... Elastic tube material (cylindrical elastic member)
DESCRIPTION OF SYMBOLS 101 ... Sealing body 102 ... Embedded part 103 ... Protruding part 104 ... Convex convex part 107 ... Embedded recessed part 110-113 ... Vent 120-123 ... Vent 131 ... Sealing body 132 ... Embedded part 133 ... Protruding part 134 ... Convex convex part 137 ... buried concave part

Claims (25)

A cylindrical first support beam;
A second support beam having a diameter larger than that of the first support beam;
A first cylindrical portion that can be fitted with the first support beam and a connecting member that has a second cylindrical portion that can be fitted with the second support beam;
A receiving recess is formed on the inner peripheral surface of the first cylindrical portion, and a receiving recess is formed on the inner peripheral surface of the second cylindrical portion,
An end portion of the first support beam is inserted and fitted into the first tubular portion of the connecting member, and a part of the inserted and fitted first support beam end portion is expanded in diameter. The diameter portion enters into the receiving recess on the inner peripheral surface of the first cylindrical portion and is locked,
An end portion of the second support beam is inserted and fitted into the second cylindrical portion of the connecting member, and a part of the inserted and fitted second support beam end portion is expanded in diameter. The first support beam and the second support beam are connected and fixed via a connecting member by the diameter portion entering and locking into the receiving recess of the inner peripheral surface of the second cylindrical portion,
A steering support beam, wherein one or a plurality of ventilation holes are formed in at least one of the first support beam and the second support beam.   2. The steering support according to claim 1, wherein a diameter-enlarged portion is formed by expanding the diameters of both sides of the attachment position of the connecting member in the both support beams, and the connecting member is sandwiched and fixed by the enlarged-diameter portion. beam.   One or a plurality of mounting bracket fitting portions are externally fitted to at least one of the support beams, and the diameters of the peripheral portions on both sides of the bracket fitting portion mounting position in the support beam are expanded. In this way, an enlarged diameter portion is formed, and the fitting bracket is fixed to the support beam by the fitting portion of the mounting bracket being sandwiched by the enlarged diameter portions in the peripheral portions on both sides thereof. Item 3. The steering support beam according to Item 1 or 2.   4. The connection member according to claim 1, wherein the connection member is formed by connecting the first tubular portion and the second tubular portion with a connection plate portion, and a communication hole is formed in the connection plate portion. The steering support beam according to item 1.   The steering according to any one of claims 1 to 4, wherein the receiving recess is formed along a circumferential direction of an inner peripheral surface of the first cylindrical portion and / or an inner peripheral surface of the second cylindrical portion. Support beam.   The steering support beam according to any one of claims 1 to 5, wherein the connecting member includes a fixing protruding piece for fixing to a vehicle body bottom portion or the like. A cylindrical first support beam is formed on the first cylindrical portion of the connecting member having a first cylindrical portion having a receiving concave portion formed on the inner peripheral surface and a second cylindrical portion having a receiving concave portion formed on the inner peripheral surface. And inserting one end of the cylindrical second support beam into the second cylindrical portion of the connecting member, and further pressing the outer peripheral surfaces of the two support beams with a pressing tool and In a state where the other end portion of the first support beam and the other end portion of the second support beam are sealed, a fluid is sealed inside the both support beams and a predetermined pressure is applied to the fluid, thereby the connection. A part of both support beam ends inserted and fitted in the member is expanded in diameter to form an expanded diameter part, and the expanded diameter part is allowed to enter the receiving recesses on the inner peripheral surfaces of the cylindrical parts. A manufacturing method for locking,
A support beam in which one or a plurality of ventilation holes is formed is used as at least one of the first support beam and the second support beam, and the support beam is used as a support beam. Using a pressing tool in which a sealing body made of an elastic member is fixed to the contact surface, when the outer peripheral surfaces of the both support beams are pressed by the pressing tool, the vent holes of the support beams are closed in a liquid-tight state by the sealing body. A method for manufacturing a steering support beam. A cylindrical first support beam is formed on the first cylindrical portion of the connecting member having a first cylindrical portion having a receiving concave portion formed on the inner peripheral surface and a second cylindrical portion having a receiving concave portion formed on the inner peripheral surface. And inserting and fitting one end portion of the cylindrical second support beam into the second cylindrical portion of the connecting member, and further attaching both ends of the connecting member on the outer peripheral surface of the both support beams. While holding the remaining part except the peripheral part with a pressing tool and sealing the other end part of the first support beam and the other end part of the second support beam, a fluid is sealed inside the both support beams. By applying a predetermined pressure to the fluid, a part of both support beam ends inserted and fitted in the connecting member is expanded to form an expanded diameter part, and the expanded diameter part is Intruding into the receiving recess on the inner peripheral surface of the cylindrical part and locking it, Serial A manufacturing method for fixing sandwiching the connecting member by the enlarged diameter portion of both sides brought diameter on both sides periphery of the mounting position of the coupling member in both support beams,
A support beam in which one or a plurality of ventilation holes is formed is used as at least one of the first support beam and the second support beam, and the support beam is used as a support beam. Using a pressing tool in which a sealing body made of an elastic member is fixed to the contact surface, when the outer peripheral surfaces of the both support beams are pressed by the pressing tool, the vent holes of the support beams are closed in a liquid-tight state by the sealing body. A method for manufacturing a steering support beam. A cylindrical first support beam is formed on the first cylindrical portion of the connecting member having a first cylindrical portion having a receiving concave portion formed on the inner peripheral surface and a second cylindrical portion having a receiving concave portion formed on the inner peripheral surface. And inserting one end of a cylindrical second support beam into the second cylindrical portion of the connecting member, and one or more of the first support beam and / or the second support beam. The fitting parts of the mounting brackets are externally fitted, and further, the remaining parts of the outer peripheral surfaces of the support beams except the peripheral parts on both sides of the connecting member and the peripheral parts on both sides of the mounting bracket fitting part are pressed with a pressing tool. And sealing the other end of the first support beam and the other end of the second support beam and enclosing a fluid inside the both support beams and applying a predetermined pressure to the fluid. , Inserted into the connecting member A portion of both support beam ends is enlarged to form a diameter-expanded portion, the diameter-increased portion is inserted into the receiving recesses on the inner peripheral surfaces of the cylindrical portions and locked; The support member mounting positions on both support beams are enlarged on both sides, and the connecting member is sandwiched and fixed by the enlarged parts on both sides, and the support bracket fitting parts on both support beams are mounted on both sides of the mounting position. A method of expanding the diameter of the portion and sandwiching and fixing the mounting bracket fitting portion by the expanded diameter portions on both sides,
A support beam in which one or a plurality of ventilation holes is formed is used as at least one of the first support beam and the second support beam, and the support beam is used as a support beam. Using a pressing tool in which a sealing body made of an elastic member is fixed to the contact surface, when the outer peripheral surfaces of the both support beams are pressed by the pressing tool, the vent holes of the support beams are closed in a liquid-tight state by the sealing body. A method for manufacturing a steering support beam.   The seal body includes an embedded portion that is embedded and fixed in an embedded recess formed on the inner peripheral surface of the presser, and a protruding portion that is connected to the embedded portion and protrudes from the inner peripheral surface of the presser. The method for manufacturing a steering support beam according to any one of claims 7 to 9.   The seal body includes an embedded portion that is embedded and fixed in an embedded recessed portion formed on the inner peripheral surface of the presser, a protruding portion that is connected to the embedded portion and protrudes from the inner peripheral surface of the presser, A fitting convex portion connected to the protruding portion and having substantially the same shape and the same size as the opening shape of the vent hole, and when the outer peripheral surfaces of the both support beams are pressed by pressing members The steering according to any one of claims 7 to 9, wherein a fitting convex portion of the seal body is inserted and disposed in a vent hole of the support beam to close the vent hole in a liquid-tight state. Support beam manufacturing method.   The method for manufacturing a steering support beam according to any one of claims 7 to 11, wherein hard rubber is used as an elastic member constituting the seal body.   The said connection member consists of what connected the said 1st cylindrical part and the said 2nd cylindrical part with the connection plate part, The communication hole is formed in this connection plate part. 2. A method for manufacturing a steering support beam according to item 1.   The cylindrical elastic member is disposed so as to be along the inner peripheral surfaces of the both support beams, a fluid is sealed inside the both support beams, and a predetermined pressure is applied to the fluid. The manufacturing method of the steering support beam of any one of Claims.   The steering support beam manufactured by the manufacturing method of any one of Claims 7-14. A cylindrical first support beam and a cylindrical second support beam having an inner diameter larger than the outer diameter of the first support beam, and a part of the first support beam is inserted into the second support beam Arranged,
A fitting portion of one or a plurality of mounting brackets is fitted on the second support beam, and the peripheral portions on both sides of the bracket fitting portion mounting position in the second support beam are expanded in diameter, thereby the second expansion. A diameter portion is formed, and the fitting portion of the mounting bracket is sandwiched by the second diameter-expanded portions around the both sides thereof, whereby the mounting bracket is fixed to the second support beam,
The first expanded portion formed by expanding the corresponding region of the second expanded portion in the first support beam enters the inner recess of the second expanded portion of the second support beam. The first support beam and the second support beam are connected and fixed by being locked.
One or more fitting bracket fitting portions are externally fitted to a region of the first support beam that is not covered with the second support beam, and both sides of the bracket fitting portion attachment position in the first support beam. A third enlarged portion is formed by expanding the peripheral portion, and the fitting portion of the mounting bracket is sandwiched by the third enlarged portion at the peripheral portions on both sides, whereby the mounting bracket is Fixed relative to the first support beam;
A steering support beam, wherein one or a plurality of ventilation holes are formed in at least one of the first support beam and the second support beam.   The steering support beam according to claim 16, wherein each of the first enlarged diameter portion, the second enlarged diameter portion, and the third enlarged diameter portion is formed along a circumferential direction of the support beam.   The steering support beam according to claim 16 or 17, wherein each of the first support beam, the second support beam, and the mounting bracket fitting portion has an elliptical cross section. A fitting portion of one or more mounting brackets is externally fitted to the cylindrical second support beam, and the remaining portions excluding the peripheral portions on both sides of the mounting bracket fitting portion on the outer peripheral surface of the second support beam. The second support is formed by enclosing a fluid inside the second support beam and applying a predetermined pressure to the fluid while being pressed by a pressing tool and sealed at both ends of the second support beam. A second enlarged portion is formed by enlarging the peripheral portions on both sides of the attachment position of the attachment bracket fitting portion in the beam, and the attachment bracket fitting portion is sandwiched and fixed by the second enlarged portions on both sides. 1 process,
A part of the cylindrical first support beam is inserted and arranged in the second support beam after the diameter expansion, and one or a plurality of the first support beam is not covered with the second support beam. The fitting part of the mounting bracket is externally fitted, and the remaining parts of the outer peripheral surfaces of the both support beams except the peripheral parts on both sides of the mounting bracket are pressed with a presser and both ends of the support beam are sealed. In this state, by enclosing a fluid inside the both support beams and applying a predetermined pressure to the fluid, the corresponding region of the second expanded portion in the first support beam is expanded and the second region is expanded. A first enlarged diameter portion is formed, and the first enlarged diameter portion is inserted into and locked into an inner concave portion of the second enlarged diameter portion of the second support beam, and an attachment block in the first support beam is formed. A second step of forming a third enlarged portion by enlarging the peripheral portions on both sides of the mounting position of the bracket fitting portion, and sandwiching and fixing the mounting bracket fitting portion by the third enlarged portions on both sides; A manufacturing method comprising:
A support beam in which one or a plurality of ventilation holes is formed is used as at least one of the first support beam and the second support beam, and the support beam is used as a support beam. Using a pressing tool in which a sealing body made of an elastic member is fixed to the abutting surface, and sealing the support beam ventilation hole with the sealing body when the outer peripheral surface of the support beam is pressed by the pressing tool. A method of manufacturing a steering support beam characterized by the above.   The seal body includes an embedded portion that is embedded and fixed in an embedded recess formed on the inner peripheral surface of the presser, and a protruding portion that is connected to the embedded portion and protrudes from the inner peripheral surface of the presser. The method for manufacturing a steering support beam according to claim 19.   The seal body includes an embedded portion that is embedded and fixed in an embedded recessed portion formed on the inner peripheral surface of the presser, a protruding portion that is connected to the embedded portion and protrudes from the inner peripheral surface of the presser, A fitting convex portion connected to the protruding portion and having substantially the same shape and the same size as the opening shape of the vent hole, and when the outer peripheral surfaces of the both support beams are pressed by pressing members 20. The method of manufacturing a steering support beam according to claim 19, wherein a fitting convex portion of the seal body is inserted and disposed in a vent hole of the support beam to close the vent hole in a liquid-tight state.   The method for manufacturing a steering support beam according to any one of claims 19 to 21, wherein hard rubber is used as the elastic member constituting the seal body.   In the first step and the second step, a cylindrical elastic member is disposed so as to be along the inner peripheral surface of the support beam, and a fluid is sealed in the support beam so that a predetermined pressure is applied to the fluid. The manufacturing method of the steering support beam of any one of Claims 19-22 to add.   The method for manufacturing a steering support beam according to any one of claims 19 to 23, wherein, in the second step, the first support beam is inserted and arranged over the entire length of the inside of the second support beam.   The steering support beam manufactured by the manufacturing method of any one of Claims 19-24.

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