JP2006264469A - Steering support beam and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steering support beam having good dimensional accuracy, light weight, and high productivity. <P>SOLUTION: A part of a first support beam 1 is inserted in a second support beam, and fitting portions 22, 29 of one or a plurality of mounting brackets are externally fitted with the second beam 2. Diameters of both side peripheral portions of a bracket fitting portion mounting position in the second beam 2 are expanded, thereby clipping the bracket fitting portions 22, 28. First diameter expanding portions 11A, 11B, 12A, 12B formed by expanding a diameter of a corresponding area of a second diameter-expanding portion in the first beam 1, enter an inside recessed portion of the second diameter expanding portion to be locked. One or the plurality of the mounting bracket fitting portions 25, 31, 34, 37 are externally fitted in an area not covered by the second beam 2 in the first beam 1. Diameters of both side peripheral portions of a bracket fitting portion mounting position in the first beam 1 are expanded to clip the bracket fitting portion. <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. A plurality of mounting brackets are welded and fixed to the steering support beam, and various on-vehicle components are fixedly mounted on the mounting brackets.

  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. Used a support beam having a double-pipe structure, and the passenger seat side used a support beam consisting of a single tube having a small diameter and connected them. For example, in Patent Document 1, a long thin pipe is inserted into a short large pipe and a part (end part) in the length direction is formed into a double pipe structure, and the tip part has a tapered shape. There has been proposed a steering support beam having a configuration in which the punch is pushed into the double pipe while being pressed from the edge of the double pipe structure, thereby expanding the diameter of the double pipe structure by expanding the pipe simultaneously.

Further, Patent Document 2 proposes a steering support beam having a double-pipe structure over its entire length in order to increase the strength at least on the driver's seat side.
JP 2003-205311 A JP-A-11-222157

  However, the technique described in Patent Document 1 has the following problems. That is, a plurality of brackets for fixing a steering column, audio, instrument panel, airbag unit, etc. are usually fixed to the steering support beam by a method such as welding. Since the fixing of the plurality of brackets is performed in a separate process from the simultaneous pipe expanding process using the pipe expanding punch, there is a problem that the production efficiency is low. Further, when the brackets are joined by welding, there is a concern that the dimensional accuracy may be reduced due to welding distortion.

  In addition, the technique described in Patent Document 2 has a double tube structure over the entire length of the steering support beam, so that there is a problem that the weight of the support beam greatly increases and cannot meet the demand for weight reduction. In addition, the welding and fixing of the plurality of brackets to the steering support beam is performed in a separate process from the double pipe forming process, which has a problem of low production efficiency.

  The present invention has been made in view of such a technical background, and an object thereof is to provide a steering support beam having good dimensional accuracy, light weight, and excellent productivity, and a method for manufacturing the same. .

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

[1] 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 A steering support beam fixed to the first support beam.

  [2] The steering support beam according to item 1, 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.

  [3] The steering support beam according to item 1 or 2, wherein each of the first support beam, the second support beam, and the mounting bracket fitting portion has an elliptical cross section.

[4] A fitting portion of one or a plurality of mounting brackets is externally fitted to the cylindrical second support beam, and the rest 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 and the 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 the mounting bracket fitting portion is sandwiched by the second enlarged diameter 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 method for manufacturing a steering support beam, comprising:

  [5] 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, and a predetermined amount is set against the fluid. 5. A method for manufacturing a steering support beam according to item 4, wherein the pressure of 5 is applied.

[6] 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 the state where both ends of the second support beam are sealed and the elastic member is sealed inside the second support beam and a predetermined pressure is applied to the elastic member. The second support beam is formed by expanding 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 the mounting bracket fitting portion is formed by the second enlarged diameter portions on both sides. A first step of sandwiching and 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 encapsulating an elastic member inside the both support beams and applying a predetermined pressure to the elastic member, the corresponding region of the second expanded portion of the first support beam is expanded. Forming a first enlarged diameter portion, and entering and locking the first enlarged diameter portion into an inner recess of the second enlarged diameter portion of the second support beam. A second step of expanding the diameter of the peripheral portions on both sides of the mounting position of the attaching bracket fitting portion to form a third enlarged diameter portion, and sandwiching and fixing the mounting bracket fitting portion by the third enlarged diameter portions on both sides. A method of manufacturing a steering support beam.

  [7] The method for manufacturing a steering support beam according to [6], wherein hard rubber is used as the elastic member.

[8] One or a plurality of mounting bracket fitting portions are externally fitted to the cylindrical second support beam, and the rest 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 the part is pressed with a pressing tool, an electromagnetic forming coil is arranged inside the second support beam and the coil is energized, whereby the mounting position of the mounting bracket fitting portion in the second support beam is set. A first step of enlarging the peripheral portions on both sides to form a second enlarged portion, and sandwiching and fixing the mounting bracket fitting portion by the second enlarged portions on both sides;
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 parts of the mounting brackets are externally fitted and the remaining parts of the outer peripheral surfaces of the both support beams except for the peripheral parts on both sides of the mounting bracket are pressed with a presser, and the insides of the two support beams By placing an electromagnetic forming coil on the coil and energizing the coil, a corresponding region of the second expanded portion in the first support beam is expanded to form a first expanded portion, and the first expanded portion is formed. The diameter portion penetrates into the inner recess of the second expanded diameter portion of the second support beam and is locked, and the peripheral portions on both sides of the mounting position of the mounting bracket fitting portion on the first support beam are expanded. Allowed by a third expanded diameter portion is formed, the manufacturing method of the steering support beam, characterized in that it comprises a second step of fixing sandwiching the mounting bracket engagement portion by the third expanded diameter portion of both sides.

  [9] The method for manufacturing a steering support beam according to [8], wherein the electromagnetic forming coil is disposed in a position adjacent to the inner peripheral surface of the support beam in an inner space of the support beam.

  [10] The method for manufacturing a steering support beam according to any one of items 4 to 9, 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.

  [11] A steering support beam manufactured by the manufacturing method according to any one of items 4 to 10.

  In the invention of [1], 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 the invention of [2], 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 [3], since the first support beam, the second support beam, and the mounting bracket fitting portion are all elliptical in cross section, the bracket can be used when the bracket fitting portion is fixed to the support beam. It is possible to reliably prevent the fitting portion from rotating in the circumferential direction of the support beam.

  In the invention of [4], the fluid is enclosed in both the support beams, and a predetermined pressure is applied to the fluid, thereby expanding the corresponding region of the second expanded portion in the first support beam and changing 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 and is locked, 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 the invention of [5], 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 to Since a predetermined pressure is applied, the diameter can be sufficiently expanded.

  In the invention of [6], an elastic member is enclosed in both the support beams and a predetermined pressure is applied to the elastic member, thereby expanding a corresponding region of the second expanded portion in the first support beam. The first enlarged diameter portion is formed, and the first enlarged diameter portion is inserted into the inner recessed portion of the second enlarged diameter portion of the second support beam to be locked. The first 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 the invention of [7], since hard rubber is used as the elastic member, the diameter can be sufficiently expanded.

  In the invention of [8], by arranging an electromagnetic forming coil inside both the support beams and energizing the coils, the corresponding region of the second expanded portion in the first support beam is expanded to increase the first expanded diameter. And the first enlarged diameter portion is inserted into the inner recessed portion of the second enlarged diameter portion of the second support beam to be locked, so that the second support beam having a larger diameter and the first support beam having a smaller diameter are formed. 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 the invention of [9], an electromagnetic action can be sufficiently exerted on the support beam, and the diameter can be sufficiently expanded.

  In the invention [10], since the first support beam is inserted and arranged 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 [11], the second support beam having a large diameter and the first support beam having a small diameter 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 (10) according to the present invention is shown in FIGS. The steering support beam (10) of the present embodiment is an automotive steering support beam 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, (1) is a first support beam, (2) is a second support beam, and (21) (24) (27) (30) (33) (36) are mounting brackets.

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

  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 fitted onto the second support beam (2), and the fitting portion ( 22) and an attachment portion (23) extending outward. 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 (1). 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 fitted onto the second support beam (2), 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 fitted onto the first support beam (1), 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 fitted onto the first support beam (1), 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 fitted onto the first support beam (1), 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, a part (left end portion) of one end side of the first support beam (1) is inserted and arranged in the second support beam (2). In the present embodiment, a configuration is adopted in which the first support beam (1) is inserted and arranged over the entire length in the longitudinal direction inside the second support beam (2) (see FIG. 2).

  A fitting portion (22) of a front pillar mounting side bracket (21) is fitted on the outer peripheral surface of the left end portion of the second support beam (2), and the fitting in the second support beam (2) is performed. The peripheral portions on the left and right sides of the joint portion (22) are expanded to form second expanded portions (13A) and (13B) extending in the circumferential direction. These second expanded portions (outside expanded portions) ( 13A) The fitting portion (22) of the side bracket (21) is sandwiched and fixed between 13A) and (13B), so that the side bracket (21) is in a stable state with respect to the second support beam (2). And it is firmly fixed.

  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 (2), and the fitting in the second support beam (2) is performed. By expanding the diameters of the left and right sides of the mounting portion (28), the second expanded portion (outside expanded portion) (15A) (15B) extending in the circumferential direction is formed. These second expanded portions (15A) ) (15B), the fitting portion (28) of the column mounting bracket (27) is sandwiched and fixed so that the column mounting bracket (27) is attached to the second support beam (2). 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) (13A) (13B) (15A) (15B) in the first support beam (1). The parts (inner diameter enlarged parts) (11A) (11B) (12A) (12B) are second diameter enlarged parts (outer diameter enlarged parts) (13A) (13B) (15A) of the second support beam (2). The first support beam (1) and the second support beam (2) are connected and fixed by entering and locking into the inner recess of (15B) (see FIG. 2).

  Further, a fitting portion (25) of a front pillar mounting side bracket (24) is externally fitted to the outer peripheral surface of the right end portion of the first support beam (1), and the first support beam (1). In the fitting portion (25), the left and right peripheral portions of the mounting position are expanded in diameter to form third expanded portions (14A) and (14B) extending in the circumferential direction, and these third expanded portions (14A) and (14B) are formed. ), The fitting portion (25) of the side bracket (24) is sandwiched and fixed so that the side bracket (24) is stably and firmly fixed to the first support beam (1). Has been.

  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 (2) in the first support beam (1). As the portion (31) is externally fitted, the left and right sides of the fitting portion (31) mounting position in the first support beam (1) are expanded in diameter so that the third diameter-expanded portion (16A) extends in the circumferential direction. ) (16B) 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 (16A) and (16B). A bag unit mounting bracket (30) is fixed to the first support beam (1) in a stable state and firmly.

  Further, a fitting portion (33) of the audio mounting bracket (33) is formed 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 (2) in the first support beam (1). 34) is externally fitted, and the left and right side peripheral portions of the fitting portion (34) mounting position in the first support beam (1) are expanded in diameter, so that the third expanded diameter portion (17A) (17A) extending in the circumferential direction 17B) is formed, and the fitting portion (34) of the audio mounting bracket (33) is sandwiched and fixed between the third enlarged diameter portions (17A) and (17B), whereby the audio mounting bracket ( 33) is firmly fixed to the first support beam (1) in a stable state.

  Further, the fitting portion of the glove box mounting bracket (36) on the outer peripheral surface of the substantially central portion of the region not covered with the second support beam (2) in the first support beam (1) (non-covered region). (37) is externally fitted, and the left and right peripheral portions of the fitting portion (37) mounting position in the first support beam (1) are expanded in diameter, so that the third diameter-expanded portion (18A) extends in the circumferential direction. (18B) 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 (18A) (18B), thereby attaching the glove box. The bracket (36) is fixed to the first support beam (1) in a stable state and firmly.

  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.

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

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

  As shown in FIG. 3 (a), a fitting portion (28) of a column mounting bracket (27) is fitted on the outer peripheral surface of the central portion of the second support beam (2), 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 left end portion of the beam (2).

  Next, as shown in FIG. 3 (b), the remaining portions of the outer peripheral surface of the second support beam (2) except for the left and right peripheral portions of the mounting bracket fitting portions (22) and (28) are moved up and down. 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 vertically. 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.

  Moreover, as shown in FIG.3 (b), the right side edge part of a 2nd support beam (2) 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 side thereof, and the elastic seal member (61A) is connected to the right end of the second support beam (2). The right end of the second support beam (2) is sealed in a liquid-tight state by applying an axial force from the outside to the inside of the sealing tool (61) while being in contact with the opening surface of the second support beam (61). Stop.

  Further, as shown in FIG. 3B, the left end portion of the second support beam (2) is sealed in a liquid-tight state by a sealing tool (62). The sealing tool (62) has a substantially disc 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 (2). The left end of the second support beam (2) is sealed in a liquid-tight state by applying an axial force from the outside to the inside of the sealing tool (62) while being in contact with the opening surface of the second support beam (2). 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 (2) via 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 state of being restrained by applying pressure from the outside to the inside, as shown in FIG. 3 (c), the mounting bracket fitting in the second support beam (2) is fitted. The left and right sides of the mounting position of the joint portions (22) and (28) are enlarged in diameter to form second enlarged portions (13A) (13B) (15A) (15B). The mounting bracket fitting portions (22) and (28) are sandwiched and fixed by (13A), (13B), (15A), and (15B). The process shown in FIGS. 3A, 3B, and 3C is the first process.

  Next, after removing the sealing tool (61), as shown in FIG. 4A, a part of one end side of the first support beam (1) is placed inside the second support beam (2). Insert and place. Further, a fitting portion of the mounting brackets (24) (30) (33) (36) in a region (non-covered region) not covered with the second support beam (2) in the first support beam (1). (25) (31) (34) (37) are externally fitted. That is, as shown in FIG. 4A, 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 (1). The fitting portion (37) of the mounting bracket (36) is externally fitted. Further, the fitting portion (31) of the bracket (30) for mounting the airbag unit is fitted on the outer peripheral surface of the first support beam (1) 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 fitted on the outer peripheral surface of the right end portion of the first support beam (1).

  Further, as shown in FIG. 4A, the mounting bracket fitting portions (22) (25) (28) (31) (34) (37) on the outer peripheral surfaces of the both support beams (1) (2). The remaining portions excluding the left and right sides are held in a state of being sandwiched and pressed by pressing tools (51), (53), (55), (56), (57), and (59) that can be divided vertically. Further, the outer side of the column mounting bracket (27) can be divided into upper and lower parts while being held in a state where the outer side of the air bag unit mounting bracket (30) is sandwiched and held by a pressing tool (52) made of a split mold that can be divided into upper and lower parts. It is held in a state of being sandwiched and pressed by a pressing tool (58) made of a split mold (see FIG. 4 (a)). 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.

Further, as shown in FIG. 4A, the left end of the second support beam (2) is sealed in a liquid-tight state with a sealing tool (62), and the first support beam (1) After the right end is sealed in a liquid-tight state with the sealing tool (61), the first support beam (1) is inserted into the first supporting beam (1) 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) (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 portion (13A) (13B) (15A) (15B) in the first support beam (1) is expanded, and the first expanded diameter portion (11A) (11B) (12A) ) (12B), and the first enlarged diameter portions (11A) (11B) (12A) (12B) are the second enlarged diameter portions (13A) (13B) (15A) of the second support beam (2). (15B) enters and locks into the inner recess of the first support beam (1). The brackets for mounting (25), (31), (34), and (37) are mounted on the left and right sides of the mounting position to increase the diameter of the third expanded portion (14A) (14B) (16A) (16B) (17A). ) (17B) (18A) (18B), and the third diameter-expanded portions (14A) (14B) (16A) (16B) (17A) (17B) (18A) (18B) on both sides The bracket fitting portions (25) (31) (34) (37) are sandwiched and fixed. The process shown in FIGS. 4A and 4B 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. 2 is obtained.

  Next, a modification of the first manufacturing method will be described with reference to FIGS. In this manufacturing method, as shown in FIGS. 5B and 5C and FIGS. 6A and 6B, the elastic tube material (in the form along the inner peripheral surface inside the support beams (1) and (2)) ( The cylindrical elastic member (80) is placed in a state where the fluid is enclosed in the support beams (1) and (2) and a predetermined pressure is applied to the fluid. The diameter is expanded by performing the same operation as in the first 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 first production method, the fluid is not particularly limited, and examples thereof include water and oil.

  Next, the 2nd manufacturing method using an elastic member is demonstrated, referring FIG.7 and FIG.8. In this second manufacturing method, an elastic member (which can be elastically deformed by pressurization, instead of performing an operation of enclosing a fluid inside both the support beams (1) and (2) and applying a predetermined pressure to the fluid) 66) is sealed and an operation of applying a predetermined pressure to the elastic member (66) is performed, and instead of disposing the sealing tools (61) (62) at both ends, the first step 2 The pressing tools (64) and (65) are respectively inserted and arranged in both ends of the support beam (2), and the pressing tools (64) and (65) are respectively inserted in both ends of the first support beam (1) in the second step. Since it is the same as that of the said 1st manufacturing method except having set it as the insertion arrangement | positioning, the same code | symbol is attached | subjected about the same part and the description is abbreviate | omitted.

  In this second manufacturing method, as shown in FIGS. 7B and 7C, in the first step, an elastic member 66 that can be elastically deformed by pressure is enclosed inside the second support beam 2. Then, a predetermined pressure is applied to the elastic member (66) from outside through the pressing tools (64) and (65). Then, as shown in FIG. 7 (c), the left and right peripheral portions of the mounting position of the mounting bracket fitting portions (22) and (28) in the second support beam (2) are expanded in diameter, thereby increasing the second diameter. Parts (13A) (13B) (15A) (15B) are formed, and the mounting bracket fitting parts (22) (28) are formed by the second enlarged diameter parts (13A) (13B) (15A) (15B) on both sides. ) To fix. In the second step, as shown in FIGS. 8A and 8B, an elastic member 66 that can be elastically deformed by pressurization is sealed inside the first support beam 1 and the elastic member 66), a predetermined pressure is applied from the outside through the pressing tools (64) and (65). Then, as shown in FIG. 8 (b), the corresponding region of the second expanded portion (13A) (13B) (15A) (15B) in the first support beam (1) is expanded in diameter to be expanded first. Diameter portions (11A), (11B), (12A), and (12B) are formed, and the first expanded diameter portions (11A), (11B), (12A), and (12B) are the second expanded diameter of the second support beam (2). Intruding into the inner recesses of the portions (13A), (13B), (15A), and (15B) and locking them, and mounting bracket fitting portions (25), (31), and (34) in the first support beam (1) (37) The left and right peripheral portions of the mounting position are enlarged to form third enlarged diameter portions (14A) (14B) (16A) (16B) (17A) (17B) (18A) (18B). Third widened portion (14A) (14B) (16A) (16B) on both sides 17A) (17B) (18A) the mounting bracket engagement portion by (18B) (25) (31) (34) (37) becomes to a pinching fixed. That is, the portion of the first support beam (1) in FIG. 8 (a) that has not been pressed by the pressing tools (51) (52) (53) (55) (56) (57) (58) (59) is enlarged. can do. Thus, the steering support beam (10) shown in FIGS. 1 and 2 can be manufactured.

  Next, the 3rd manufacturing method using electromagnetic forming is demonstrated, referring FIG.9 and FIG.10. In this third manufacturing method, instead of performing an operation of enclosing a fluid inside the both support beams (1) and (2) and applying a predetermined pressure to the fluid, both the support beams (1) and (2) Except that the electromagnetic forming coil (70) is placed inside and the coil (70) is energized, and the sealing tools (61) (62) at both ends are not arranged. Since it is the same as that of the 1st manufacturing method, about the same part, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In this third manufacturing method, as shown in FIGS. 9B, 9C, 10A, and 10B, the electromagnetic forming coil 70 is disposed inside both the support beams 1 and 2. Let me. Preferably, the electromagnetic forming coil (70) is arranged in the vicinity of the inner peripheral surface of the support beams (1) and (2) in the internal space of the both support beams (1) and (2). Thus, for example, when a large current is suddenly supplied to the coil (70), an induced current called an eddy current flows through the support beams (1) and (2), and the support beams (1) and (2) are heated by Joule heat. At the same time, the electromagnetic force acts in the direction of pressing (pushing) the support beams (1) and (2) outward, that is, pressing outward while heating, so in the first step, as shown in FIG. In addition, the left and right side peripheral portions of the mounting position of the mounting bracket fitting portions (22) and (28) in the second support beam (2) are expanded in diameter to form second expanded portions (13A) (13B) (15A). (15B) is formed, and the mounting bracket fitting portions (22) and (28) are sandwiched and fixed by the second enlarged diameter portions (13A) (13B) (15A) (15B) on both sides, and the second step. Then, as shown in FIG. Thus, the corresponding region of the second expanded portion (13A) (13B) (15A) (15B) in the first support beam (1) is expanded, and the first expanded portion (11A) (11B) ( 12A) and 12B are formed, and the first enlarged diameter portions (11A), (11B), (12A), and (12B) are the second enlarged diameter portions (13A), (13B), and (15A) of the second support beam (2). ) (15B) enters and locks into the inner recess, and both left and right sides of the mounting positions of the mounting bracket fitting portions (25) (31) (34) (37) in the first support beam (1). The peripheral portion is expanded in diameter to form third expanded portions (14A), (14B), (16A), (16B), (17A), (17B), (18A), and (18B). ) (14B) (16A) (16B) (17A) (17B) (18) ) Becomes said mounting bracket engagement portion (25) (31) (34) jamming fixing (37) by (18B). That is, the portion of the first support beam (1) in FIG. 10A that has not been pressed by the pressing tools (51) (52) (53) (55) (56) (57) (58) (59) is enlarged. can do. Thus, the steering support beam (10) shown in FIGS. 1 and 2 can be manufactured.

  In the embodiment shown in FIGS. 9 and 10, the electromagnetic forming coil (70) is disposed along the entire inner peripheral surface of the support beams (1) and (2) in the inner space of the both support beams (1) and (2). However, for example, the electromagnetic forming coil (70) may be selectively disposed at a position where the diameter is desired to be expanded.

  In the present invention, the widths of the first enlarged diameter portions (11) and (12), the second enlarged diameter portions (13) and (15), and the third enlarged diameter portions (14), (16), (17), and (18). (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 (11-18) is not specifically limited, It is preferable to set to 0.5-3 mm.

  The outer diameters of the first support beam (1) and the second support beam (2) are preferably set to 60 to 100 mm (especially in the case where the support beam is made of an aluminum material). Is good). The thickness of the first support beam (1) and the second support beam (2) 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 (1) and (2) have an elliptical cross section. However, the support beams (1) and (2) 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 (1) and (2) are preferably formed to have an elliptical or polygonal cross section, and in this case, when the fitting portion of the mounting bracket is fixed, these support beams ( 1) There is an advantage that the rotational movement in the circumferential direction of (2) can be surely prevented. For example, when the support beams (1) and (2) have a polygonal cross section, the fitting portion of the mounting bracket is a polygon that can be externally fitted to the support beams (1) and (2) having a polygonal cross section. What is necessary is just to comprise in a shape. The same applies when the support beams (1) and (2) are formed in other irregular cross-sectional shapes. In addition, when adopting a polygonal cross section as the support beams (1) and (2), it is preferable to make the corners into a substantially arcuate shape (with roundness) 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 (1) and (2) when the fitting portion of the mounting bracket is fixed is, 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 (other than that, electromagnetic forming, etc.), the diameter corresponding to the concave groove in the first support beam (1) and the second support beam (2) is expanded to form an expanded diameter portion, and the expanded diameter portion is For example, a configuration (see Japanese Patent Application Laid-Open No. 7-116751) that enters and locks into the recessed groove of the mounting bracket fitting portion.

  In the above embodiment, the first support beam (1), the second support beam (2), 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 (1), the second support beam (2), and the mounting brackets (21), (24), (27), (30), (33), and (36) are made by injection molding of resin (including FRP). It may be formed of a material. Moreover, the 1st support beam (1) and the 2nd support beam (2) may be formed with iron or copper, or may be comprised with the 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 (1) and the second support beam (2). 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), and (36) are attached to the support beams (1) and (2). ) (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.

  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 the steering support beam which concerns on one Embodiment of this invention. It is sectional drawing of the XX line in FIG. It is sectional drawing which shows an example of the 1st process of the 1st manufacturing method using the fluid pressure based on this invention, (a) is the state which has arrange | positioned the bracket with respect to the 2nd support beam, (b) is a pressing tool further (C) shows the state which added the fluid pressure, respectively. It is sectional drawing which shows an example of the 2nd process of the 1st manufacturing method using the fluid pressure which concerns on this invention, (a) inserts the one end part of a 1st support beam in a 2nd support beam, and a bracket and holding | suppressing The state which arranged the tool, (b) shows the state where fluid pressure was added, respectively. It is sectional drawing which shows the 1st process of the other example of the 1st manufacturing method using the fluid pressure based on this invention, (a) is the state which has arrange | positioned the bracket with respect to the 2nd support beam, (b) is further A state in which the presser is arranged, and (c) shows a state in which fluid pressure is applied. It is sectional drawing which shows the 2nd process of the other example of the 1st manufacturing method using the fluid pressure based on this invention, (a) inserts the one end part of a 1st support beam in a 2nd support beam, and is a bracket And (b) shows a state in which fluid pressure is applied. It is sectional drawing which shows an example of the 1st process of the 2nd manufacturing method using the elastic member based on this invention, (a) is the state which has arrange | positioned the bracket with respect to the 2nd support beam, (b) is a pressing tool further (C) shows the state which added the fluid pressure, respectively. It is sectional drawing which shows an example of the 2nd process of the 2nd manufacturing method using the elastic member which concerns on this invention, (a) inserts the one end part of a 1st support beam in a 2nd support beam, and a bracket and pressing The state which arranged the tool, (b) shows the state where fluid pressure was added, respectively. It is sectional drawing which shows an example of the 1st process of the 3rd manufacturing method using the electromagnetic shaping | molding based on this invention, (a) is the state which has arrange | positioned the bracket with respect to the 2nd support beam, (b) is a pressing tool further (C) shows the state which added the fluid pressure, respectively. It is sectional drawing which shows an example of the 2nd process of the 3rd manufacturing method using the electromagnetic shaping | molding which concerns on this invention, (a) inserts the one end part of a 1st support beam in a 2nd support beam, and a bracket and holding | suppressing The state which arranged the tool, (b) shows the state where fluid pressure was added, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st support beam 2 ... 2nd support beam 10 ... Steering support beam 11, 12 ... 1st diameter expansion part (inside diameter expansion part)
13, 15 ... 2nd diameter expansion part (outside diameter expansion part)
14, 16, 17, 18: Third diameter enlarged portion 21: Mounting side bracket 22 ... Fitting portion 24 ... Mounting side bracket 25 ... Fitting portion 27 ... Column mounting bracket 28 ... Fitting portion 30 ... Airbag Unit mounting bracket 31 ... fitting part 33 ... audio mounting bracket 34 ... fitting part 36 ... glove box mounting bracket 37 ... fitting part 51 to 53, 55 to 59 ... pressing member 66 ... elastic member 70 ... coil 80 ... Elastic tube material (cylindrical elastic member)

Claims (11)

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 A steering support beam fixed to the first support beam.   2. The steering support beam according to claim 1, 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 1, 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 method for manufacturing a steering support beam, comprising:   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, and a predetermined pressure is applied to the fluid. The manufacturing method of the steering support beam of Claim 4 to add. 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. By holding a pressing member and sealing both ends of the second support beam, an elastic member is sealed in the second support beam and a predetermined pressure is applied to the elastic member. (2) The diameters of the periphery of both sides of the mounting position of the mounting bracket fitting portion in the support beam are expanded to form a second expanded diameter portion, and the mounting bracket fitting portion is sandwiched and fixed by the second expanded diameter portions on both sides. A first step of
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 encapsulating an elastic member inside the both support beams and applying a predetermined pressure to the elastic member, the corresponding region of the second expanded portion of the first support beam is expanded. Forming a first enlarged diameter portion, and entering and locking the first enlarged diameter portion into an inner recess of the second enlarged diameter portion of the second support beam. A second step of expanding the diameter of the peripheral portions on both sides of the mounting position of the attaching bracket fitting portion to form a third enlarged diameter portion, and sandwiching and fixing the mounting bracket fitting portion by the third enlarged diameter portions on both sides. A method of manufacturing a steering support beam.   The method for manufacturing a steering support beam according to claim 6, wherein hard rubber is used as the elastic member. 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. Around the both sides of the mounting position of the mounting bracket fitting portion in the second support beam by placing an electromagnetic forming coil inside the second support beam and energizing the coil while being pressed by the presser A first step of expanding the part to form a second enlarged part, and sandwiching and fixing the mounting bracket fitting part by the second enlarged parts on both sides;
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 parts of the mounting brackets are externally fitted and the remaining parts of the outer peripheral surfaces of the both support beams except for the peripheral parts on both sides of the mounting bracket are pressed with a presser, and the insides of the two support beams By placing an electromagnetic forming coil on the coil and energizing the coil, a corresponding region of the second expanded portion in the first support beam is expanded to form a first expanded portion, and the first expanded portion is formed. The diameter portion penetrates into the inner recess of the second expanded diameter portion of the second support beam and is locked, and the peripheral portions on both sides of the mounting position of the mounting bracket fitting portion on the first support beam are expanded. Allowed by a third expanded diameter portion is formed, the manufacturing method of the steering support beam, characterized in that it comprises a second step of fixing sandwiching the mounting bracket engagement portion by the third expanded diameter portion of both sides.   The method of manufacturing a steering support beam according to claim 8, wherein the electromagnetic forming coil is disposed in a position adjacent to an inner peripheral surface of the support beam in an inner space of the support beam.   The method for manufacturing a steering support beam according to any one of claims 4 to 9, wherein, in the second step, the first support beam is inserted and arranged over the entire inner length of the second support beam.   The steering support beam manufactured by the manufacturing method of any one of Claims 4-10.

Images