JP2014133446A - High intensity suspension parts for vehicle, and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide suspension parts with further lightweight by achieving reductions in size of a cylindrical part of the suspension parts while securing sufficient strength and rigidness.SOLUTION: Suspension parts comprises: a cylindrical part made of aluminum alloy where a press-fit body is press-fitted; and fiber reinforcement wound on an outer peripheral surface of the cylindrical part.

Description

  The present invention relates to a high-strength suspension component for a vehicle and a method for manufacturing the same.

  In vehicles such as automobiles, reducing the unsprung weight is effective in improving the fuel efficiency and running performance of the vehicle. For this reason, in recent years, suspension parts such as suspension links, suspension arms, and suspension rods have been made lighter by using an aluminum alloy as a material. As suspension parts made of aluminum alloy, suspension parts described in Patent Documents 1 to 3 are known.

JP 2004-42107 A JP 2011-83810 A WO2008 / 010266 pamphlet

  However, in Patent Documents 1 to 3, there is nothing about reducing the weight by reducing the diameter and thickness of a cylindrical press-fitting portion (hereinafter referred to as a cylindrical portion) into which a press-fitted body such as a bush or a ball joint is press-fitted. Not considered. If the diameter of the cylindrical part is reduced and the suspension is made lighter, the suspension part is lighter, but the stress generated in the cylindrical part is increased by the elastic force from the press-fitted body, and the creep strength of the cylindrical part is increased. descend. Further, if the cylindrical portion is reduced in diameter and thinned, the strength of the cylindrical portion against a dynamic load (such as bending fatigue strength) that is input when the vehicle travels also decreases, and the durability of the suspension component decreases. For this reason, there is a limit to reducing the diameter and thickness of the cylindrical portion.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to reduce the diameter of the cylindrical part of the suspension part while ensuring sufficient strength and rigidity, and to obtain a lighter suspension part and its It is to provide a manufacturing method.

  One aspect of the present invention is a suspension component including an aluminum alloy cylindrical portion into which a press-fit body is press-fitted, and a fiber reinforcement wound around an outer peripheral surface of the cylindrical portion.

  In the suspension component, since the fiber reinforcing material is wound around the outer peripheral surface of the cylindrical portion, the diameter can be reduced while ensuring the strength and rigidity of the cylindrical portion. Thereby, the weight of the suspension component can be further reduced.

FIG. 1 is a view showing a suspension rod according to an embodiment of the present invention, in which (a) is a front view and (b) is a plan view. FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. FIG. 3 is a flowchart showing a method for manufacturing a suspension rod according to an embodiment of the present invention. FIG. 4 is a diagram for explaining the details of the winding step of FIG. FIG. 5 is a diagram showing a model used for calculation for evaluating the effect of reinforcement by winding a fiber reinforcement around a cylindrical portion. FIG. 6 is a diagram showing first to sixth modifications of the present invention. FIG. 7 is a view showing an example in which the present invention is applied to a suspension arm in which three cylindrical portions are connected by a plate-like connecting portion, where (a) is a plan view and (b) is C of a ball joint press-fitting portion. It is an arrow view. FIG. 8 is a view showing an example in which the present invention is applied to a suspension arm in which three cylindrical portions are connected by a plate-like connecting portion having a punched hole, where (a) is a plan view and (b) is (a) It is an end view of the cross section along the DD line in FIG. FIG. 9 is a view showing an example in which the present invention is applied to a suspension arm in which three cylindrical portions are connected by an arm-like connecting portion, where (a) is a plan view and (b) is an E arrow in (a). FIG. FIG. 10 is a diagram showing an example in which the present invention is applied to an end member made of a member formed by cutting. FIG. 11 is a view showing an example in which the present invention is applied to a suspension link formed by joining a plate-like member and a tubular member, wherein (a) is a plan view and (b) is a side view.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.

  FIG. 1 is a view showing a suspension rod 1 according to an embodiment of the present invention, in which (a) is a front view and (b) is a plan view. FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. The suspension rod 1 has a substantially I-shape as a whole, and is composed of a pair of cylindrical portions 2 provided at both ends thereof, and a rod portion 3 for connecting them. Each cylindrical portion 2 is provided with a press-fitting hole 5 into which a bush 4 that is a press-fitting body is press-fitted. In the present specification, a portion connected to the cylindrical portion 2 such as the rod portion 3 is also referred to as a connecting portion J. The connecting portion J includes a plate-like connecting portion 32 of the suspension arm 31 shown in FIG. 7, which will be described later, a plate-like connecting portion 32A of the suspension arm 31A shown in FIG. 8, an arm-like connecting portion 32B of the suspension arm 31B shown in FIG. The bracket 43 of the end member 41, the plate-like member (arm-like connecting portion) 52 of the suspension link 51 of FIG.

  The suspension rod 1 as a whole including the cylindrical portion 2 and the rod portion 3 is integrally formed of JIS standard 6000 series aluminum alloy (Al-Mg-Si alloy), specifically, JIS-A6061 aluminum alloy. Yes. The material of the suspension rod 1 is not particularly limited, and other aluminum alloys can be appropriately selected and applied according to various design conditions such as environmental conditions and load conditions in which the suspension rod 1 is used. . Representative examples include JIS standard 5000 series aluminum alloy (Al-Mg alloy), JIS standard 7000 series aluminum alloy (Al-Zn-Mg alloy), and the like.

  Each tubular portion 2 includes a tubular base portion 6 connected to an end portion of the rod portion 3, a tubular first boss portion 7a, and a tubular second boss portion 7b. The first boss portion 7 a is formed so as to protrude from the base portion 6 to one side in the axial direction of the cylindrical portion 2 (the axis O direction of the press-fit hole 5). The second boss portion 7 b is formed to protrude from the base portion 6 to the other axial side of the tubular portion 2. The base 6 includes an outer peripheral surface that smoothly continues to the outer peripheral surface of the first boss portion 7a and the outer peripheral surface of the second boss portion 7b. In the suspension rod 1, the two cylindrical portions 2 are arranged in parallel to each other (so that the axial directions of the two cylindrical portions 2 are parallel to each other). It is determined by the usage pattern and is not limited to this. For example, the phases (mounting angles) of the cylindrical portions 2 may be arranged so as to be shifted from each other by a predetermined angle (for example, 90 ° around the axis of the rod portion 3). Moreover, in the suspension rod 1, although the cylindrical part 2 was provided in both ends, the cylindrical part 2 may be provided only in the one side edge part.

  A first fiber reinforcing material 8a is wound around the outer peripheral surface of the first boss portion 7a, and a second fiber reinforcing material 8b is wound around the outer peripheral surface of the second boss portion 7b. In addition, the shape of the outer peripheral surface of each boss | hub part 7a, 7b is not specifically limited, If it is a shape which can wind fiber reinforcement material 8a, 8b, it will be cylindrical surface shape, elliptic cylinder surface shape, square tube surface The shape may be a conical surface, a pyramidal surface, or a spherical surface that is reduced in diameter toward the outer side in the axis O direction of the press-fitting hole 5. Therefore, the shape of the outer peripheral surface in the cross section perpendicular to the axis O direction of the press-fitting hole 5 is not particularly limited, and may be a circle, an ellipse or an oval, a polygon with rounded corners, or the like.

  The first and second fiber reinforcing materials 8a and 8b are fiber reinforced plastics composed of reinforcing fibers that are long fibers and a resin material (matrix) for fixing the reinforcing fibers.

  The reinforcing fibers of the fiber reinforcements 8a and 8b are PAN-based or PITCH-based carbon fibers. In addition, the kind of reinforcing fiber is not specifically limited, According to various design conditions, such as an environmental condition in which the suspension rod 1 is used, and load conditions, it can select and apply from existing reinforcing fibers suitably. Representative examples include aramid fiber, polyethylene fiber, and Zylon (registered trademark of Toyobo Co., Ltd.).

  A thermosetting epoxy resin is used as the resin material of the fiber reinforcements 8a and 8b. The type of the resin material is not particularly limited, and other resin materials can be selected and applied according to various design conditions such as the type of reinforcing fiber. Typical examples include thermosetting unsaturated polyester resins, polyamide resins, phenol resins, and the like.

  The bush 4 includes a cylindrical inner cylinder 4a, a cylindrical outer cylinder 4b, and a rubber-like elastic body 4c interposed therebetween. A shaft such as another connecting arm (not shown) or a mounting member (not shown) is inserted into the inner hole of the inner cylinder 4a and fixed by a fastener such as a bolt. Thereby, the suspension rod 1 is vibration-proof connected to a part of the suspension mechanism of the vehicle. In this embodiment, the bush 4 is a concentric bush as shown in FIG. 2, but the bush 4 may be an eccentric bush. Moreover, the bush 4 may not have the outer cylinder 4b.

  The bush 4 is press-fitted into the press-fitting hole 5 using a conventionally known press-fitting device. Chamfered surfaces 5 b are formed at both axial ends of the inner peripheral surface of the press-fitting hole 5. In this case, the region sandwiched between the chamfered surfaces 5b in the inner peripheral surface comes into surface contact with the outer peripheral surface of the outer cylinder 4b of the bush 4 press-fitted into the press-fitting hole 5, and the repulsive force ( The pressure receiving surface 5a receives the elastic force. The first and second fiber reinforcements 8a and 8b are located within the range of the axial length L of the pressure receiving surface 5a. The chamfered surface 5b is not necessarily formed. When the chamfered surface 5b is not provided, the axial length L of the pressure-receiving surface 5a and the axial length of the cylindrical portion 2 are the same value.

  Next, a method for manufacturing the suspension rod 1 according to this embodiment will be described. FIG. 3 is a flowchart showing a method for manufacturing the suspension rod 1. In the following description, the first boss portion 7a and the second boss portion 7b are also collectively referred to as the boss portion 7. The first fiber reinforcing material 8a, the second fiber reinforcing material 8b, and a prepreg 8c described later are also collectively referred to as a fiber reinforcing material 8.

  As shown in FIG. 3, the method for manufacturing the suspension rod 1 includes a forming step S1, a winding step S2, and a bush press-fitting step S3.

  First, in the forming step S1, the suspension rod 1 including the cylindrical portion 2 is formed by forging a forging material made of an aluminum alloy. The forging material is a deformed continuous cast material manufactured by a semi-continuous casting method and subjected to a homogenization treatment. The maximum thickness of the thick portion of the suspension rod 1 that is the finished product (the maximum in the rolling direction of the forging process). It is a slice material sliced at a thickness matched to (height). The cross-sectional shape of the deformed continuous cast material in the cross section perpendicular to the casting progress direction is designed to approximate the shape of the suspension rod 1 that is a finished product projected in the operating direction of the forging press at the time of forging (the reduction direction). . In the molding step S1, the forging material is set in a forging die, hot forging (die forging) is performed to form a shape approximate to a finished product, and burrs are then removed (trimming). Thereafter, solution treatment and artificial age hardening treatment (T6) are performed, and press-fitting holes 5 are formed in the thick wall portions at both ends by machining to form the cylindrical portion 2.

In the winding step S2, as shown in FIG. 4, the fiber reinforcing material 8 (8a, 8b) is wound around the outer peripheral surface of the tubular portion 2 using the filament winding device 10. The filament winding apparatus 10 includes a bobbin 11 around which a carbon fiber F ₁ that is a reinforcing fiber of the fiber reinforcement 8 is wound, a resin bath 12 for impregnating the wound carbon fiber F ₁ with a liquid resin material, and a resin bath 12. The guide part 13 which guides the carbon fiber F ₂ impregnated with the resin material supplied from the outer peripheral surface of the boss part 7 (7a, 7b) of the cylindrical part 2, and the suspension rod 1 around the axis of the cylindrical part 2 And a drive mechanism 14 for rotationally driving.

The resin bath 12 includes a resin tank (not shown) filled with a liquid epoxy resin and an impregnation roller (not shown) partially immersed in the resin tank. The carbon fiber F ₁ introduced into the resin bath 12 is pulled out from the resin bath 12 after being pressed against the outer peripheral surface of the impregnation roller. The outer peripheral surface of the impregnation rollers, since the epoxy resin in the resin tank is attached, by a carbon fiber F ₁ is pressed against the outer peripheral surface thereof, a carbon fiber F ₁ is a resin material attachment is impregnated. The resin tank is provided with a heater, and the temperature of the epoxy resin is maintained in a range of 40 ° C. to 50 ° C., for example.

  The thickness of the fiber reinforcement 8 wound around the cylindrical portion 2 is managed to a predetermined thickness by, for example, counting the number of rotations of the drive mechanism 14 and measuring the number of windings. You may manage the thickness of the fiber reinforcement 8 wound around the cylindrical part 2 by measuring using the non-contact-type measuring device, such as an optical sensor, for example. The required thickness (number of windings) of the fiber reinforcement 8, the winding range, the winding position, the fiber diameter of the carbon fiber of the fiber reinforcement 8, the fiber content, etc. are the load conditions applied to the tubular portion 2, etc. Can be obtained through experiments or analysis based on the above.

The tension of the carbon fiber F ₂ when wound around the cylindrical portion 2 can be adjusted by adjusting the rotational torque of the drive mechanism 14. A tension sensor may be provided in the guide portion 13 to manage the tension of the reinforcing fiber. In the present embodiment, the suspension rod 1 itself is rotated around the axis of the cylindrical portion 2 by the drive mechanism 14 and the fiber reinforcing material 8 is wound up. However, the cylindrical portion 2 is around the guide portion 13. The fiber reinforcement 8 may be wound around the cylindrical portion 2 so as to revolve. By doing so, the fiber reinforcing material 8 can be wound around the cylindrical portion 2 without rotating the suspension rod 1.

  After the fiber reinforcing material 8 is wound around the cylindrical portion 2 by a predetermined thickness, the epoxy resin is thermally cured. The suspension rod 1 in which the fiber reinforcing material 8 is wound around the cylindrical portion 2 is housed in an autoclave, and the resin curing temperature (for example, 120 ° C. to 180 ° C.) under a predetermined pressure (for example, about 0.5 to 0.7 Mpa). Held for about a predetermined time (for example, about 1 to 2 hours). Before the thermosetting process, a deaeration process may be performed in which the suspension rod 1 in which the fiber reinforcing material 8 is wound around the cylindrical part 2 is held for a predetermined time in an atmosphere reduced to a predetermined negative pressure. Thereby, it can prevent that the gas which remained between the inside of the fiber reinforcement 8, the outer peripheral surface of the cylindrical part 2, and the fiber reinforcement 8 is foamed by the heating during a thermosetting process.

  In the bush press-fitting step S3 subsequent to the winding step S2, the bush 4 is press-fitted into the tubular portion 2 using a conventionally known press-fitting device. Thereby, the suspension rod 1 by which the fiber reinforcement was wound around the cylindrical part 2 in which the bush 4 was press-fitted can be obtained.

<Effect>
In order to evaluate the effect of reinforcing the tubular portion 2 by winding the fiber reinforcement 8 around the tubular portion 2, the stress generated in the tubular portion 2 when the bush 4 is pressed into the press-fitting hole 5 was calculated. Specifically, as shown in FIG. 5, a belt-shaped reinforcing material 22 corresponding to the fiber reinforcing materials 8 a and 8 b is wound around the outer peripheral surface of the hollow cylindrical body 21 corresponding to the cylindrical portion 2, and the inside of the cylindrical body 21 is The stress generated on the outer peripheral surface 24 of the cylindrical body 21 when a predetermined surface pressure was uniformly applied to the peripheral surface was obtained. Here, the belt-like reinforcing material 22 was wound around two positions located at 25% of the axial length TL of the cylindrical body 21 from both axial ends of the cylindrical body 21. The width W of each band-shaped reinforcing member 22 is equivalent to 10% of the axial length TL of the cylindrical body 21, and the thickness T ₁ is equivalent to 50% of the plate thickness T ₀ of the cylindrical body 21. Further, the tensile strength of the strip-shaped reinforcing material 22 was set to a value 10 times the tensile strength of iron, and the Young's modulus was set to a value 10 times the Young's modulus of iron. The mechanical properties of the cylindrical body 21 were set to values of a JIS-A6061 aluminum alloy that had been T6 treated. The surface pressure applied to the inner peripheral surface of the cylindrical body 21 corresponds to the surface pressure applied to the pressure receiving surface 5a when the bush 4 is press-fitted into the cylindrical portion 2 with a press-fitting allowance of 0.3 (mm). It was.

  As a result of the above calculation, it was confirmed that the stress generated on the outer peripheral surface 24 of the cylindrical body 21 around which the belt-shaped reinforcing material 22 was wound was significantly reduced as compared with the case where the belt-shaped reinforcing material 22 was not wound. . For example, the generated stress is reduced by about 35% at the point P on the outer peripheral surface 24 in the central portion of the cylindrical body 21 in the axial direction. In the above calculation, the value of JIS-A6061-T6 aluminum alloy was used as the mechanical characteristic of the cylindrical body 21, but the same effect could be obtained even if the characteristics of other JIS6000 series aluminum alloys were used. . This is because the stress generated in the tubular part 2 is reduced by winding the fiber reinforcing material 8 around the outer peripheral surface of the tubular part 2 made of aluminum alloy, that is, the strength of the tubular part 2 by the reinforcing means. It also shows that this can be further reduced in diameter while securing rigidity.

  As described above, in the suspension rod 1 according to the present embodiment, the fiber reinforcing material 8 is wound around the outer peripheral surface of the tubular portion 2 made of aluminum alloy into which the bush 4 is press-fitted. Accordingly, it is possible to reduce the diameter of the cylindrical portion 2 while ensuring the strength and rigidity of the cylindrical portion 2, and it is possible to further reduce the weight of the suspension rod 1 as a whole.

  Further, the thickness of the forging material used in the molding step S1 is determined in accordance with the maximum thickness of the thick part of the forged finished product in order to prevent the lack of thickness during forging. That is, in the case of the suspension rod 1, the thickness of the forging material is determined by the outer diameter or height of the cylindrical portion 2. In this embodiment, since the cylindrical part 2 can be reduced in diameter as described above, if the rolling direction of the forging process is orthogonal to the axial direction of the cylindrical part 2, the thinner forging material Thus, the desired suspension rod 1 can be obtained. Thereby, since the amount of burrs generated in the forging process can be reduced, the yield of the material can be improved.

  Furthermore, in this embodiment, the stress which arises in the cylindrical part 2 by bush press-fit as mentioned above can be reduced. Therefore, when the suspension rod 1 is placed in a corrosive environment, the possibility of stress corrosion cracking occurring in the tubular portion 2 can be reduced.

  Further, the tubular portion 2 is formed with a boss portion 7 protruding in the axial direction of the tubular portion 2 from the tubular base portion 6 connected to the rod portion 3, and a fiber is formed on the outer peripheral surface of the boss portion 7. A reinforcing material 8 is wound around. Thus, since the fiber reinforced material 8 is easily wound around the protruding boss portion 7, the fiber reinforced material 8 is firmly wound around the cylindrical portion 2 connected to the rod portion 3. Can do.

  Further, the cylindrical portion 2 is formed to protrude from the base 6 to the one axial side of the cylindrical portion 2 and to protrude from the base 6 to the other axial side of the cylindrical portion 2. And a second boss portion 7b. And the 1st fiber reinforcement 8a is wound around the outer peripheral surface of the 1st boss | hub part 7a, and the 2nd fiber reinforcement 8b is wound around the outer peripheral surface of the 2nd boss | hub part 7b. Thereby, the 1st and 2nd boss | hub parts 7a and 7b whose rigidity or intensity | strength is inferior compared with the base 6 connected with the rod part 3 can be reinforced effectively. Further, since the first and second boss portions 7a and 7b formed on both sides of the base portion 6 are reinforced, the reinforcing effect can be effectively applied to the base portion 6 between the boss portions 7a and 7b. Can do.

  The fiber reinforcing material 8 is a fiber reinforced plastic composed of reinforcing fibers that are long fibers and a resin material for fixing the reinforcing fibers. Therefore, when the fiber reinforcing material 8 is wound around the tubular portion 2, the fiber reinforcing material 8 can be wound in a state in which the reinforcing fibers of the fiber reinforcing material 8 are continuous in the circumferential direction of the tubular portion 2. The diameter expansion deformation of the part 2 can be effectively restrained, and the cylindrical part 2 can be reinforced reliably.

  Furthermore, the cylindrical part 2 is provided with the pressure receiving surface 5a which receives the elastic force from the bush 4, and the fiber reinforcement 8 is arrange | positioned in the range of the axial direction length L of the pressure receiving surface 5a. For this reason, the elastic force from the bush 4 can be effectively (more directly) received by the fiber reinforcement 8, and the stress generated in the tubular portion 2 can be reliably reduced.

  Moreover, in the manufacturing method of the suspension rod 1 according to the present embodiment, the bush 4 is attached to the tubular portion 2 in a state where the fiber reinforcing material 8 is wound around the outer peripheral surface in the bush press-fitting step S3 following the winding step S2. Press fit. For this reason, the tension at the time of winding the fiber reinforcing material 8 can be suppressed to a low value as compared with the case where the fiber reinforcing material 8 is wound around the tubular portion 2 after the bush press-fitting, that is, after the diameter-expanding deformation. . That is, with a lower winding tension, it is possible to effectively suppress the stress generated in the tubular portion 2 after the bushing is press-fitted. Note that the winding step S2 is not necessarily performed before the bush press-fitting step S3, and if the diameter expansion deformation of the cylindrical portion 2 due to the press-fitting of the bush 4 can be temporarily suppressed using a pressing jig or the like, You may make it perform after bush press-fit process S3.

<First Modification>
In the said embodiment, the 1st and 2nd fiber reinforcement material 8a was provided in the outer peripheral surface in those which provided the 1st and 2nd boss | hub parts 7a and 7b which each protruded from the base 6 to the axial direction both sides. , 8b are wound around, but the winding pattern of the fiber reinforcement is not limited to this. For example, as shown in FIG. 6A, the boss portion 7 may be provided only on one axial side of the tubular portion 2 from the base portion 6, and the fiber reinforcing material 8 may be wound only on the outer peripheral surface thereof. Even in this case, the same effects as those described in the above embodiment can be obtained.

<Second Modification>
Further, as shown in FIG. 6B, the first fiber reinforcing material 8a is wound obliquely from the first boss portion 7a to the second boss portion 7b so as to form an X shape in a front view. The fiber reinforcing material 8b may be wound obliquely from the first boss portion 7a to the second boss portion 7b so as to intersect the first fiber reinforcing material 8a on the outer peripheral surface of the base portion 6. Thereby, while being able to acquire the effect similar to the effect described by the said embodiment, the base 6 can be reinforced more reliably. Moreover, as shown in FIG.6 (c), the 1st fiber reinforcement 8a is wound from the 1st boss | hub part 7a to the base 6 so that it may become V shape by a front view, and the 2nd fiber reinforcement 8b is attached. The second boss portion 7b may be wound around the base portion 6 so as to intersect the first fiber reinforcement 8a on the outer peripheral surface of the base portion 6. The base 6 can be reinforced also by such a method.

<Third Modification>
The fiber reinforcement 8 may be spirally wound around the outer peripheral surface of the boss portion 7 as shown in FIG. FIG. 6D shows an example in which the boss portion 7 is protruded from the base portion 6 only on one side in the axial direction of the cylindrical portion 2. Alternatively, the second boss portions 7a and 7b may be formed, and the fiber reinforcing materials 8a and 8b may be spirally wound around these boss portions. In this case, the fiber reinforcement 8 may be spirally wound around the outer peripheral surface of the base 6. Thereby, the whole cylindrical part 2 can be effectively reinforced with few fiber reinforcements 8. FIG.

<Fourth Modification>
As shown in FIG. 6 (e), a unidirectional prepreg 8c obtained by impregnating a reinforcing fiber aligned in one direction with a thermosetting resin may be used as the fiber reinforcing material 8. Thereby, the winding process of the fiber reinforcement 8 can be shortened, and productivity can be improved. The unidirectional prepreg 8c is cut into a necessary shape and wound around the outer peripheral surface of the cylindrical portion 2 a plurality of times. At this time, it is preferable that the reinforcing fibers of the unidirectional prepreg 8c are wound around the outer peripheral surface of the cylindrical portion 2 a plurality of times in a state where the reinforcing fibers are continuous in the circumferential direction of the cylindrical portion 2. Thereby, the reinforcing fiber of the prepreg 8c effectively restrains the diameter-expansion deformation of the cylindrical portion 2, and the stress generated on the outer peripheral surface of the cylindrical portion 2 can be surely reduced.

<Fifth Modification>
Further, as shown in FIG. 6 (f), the entire outer peripheral surface of the base portion 6 and the outer peripheral surfaces of the boss portions 7a and 7b may be covered with a prepreg 8c. Thereby, the whole cylindrical part 2 can be reinforced and the cylindrical part 2 can be made still thinner.

<Sixth Modification>
As shown in FIG. 6 (g), a concave portion 9 is formed on the outer peripheral surface of the cylindrical portion 2 along the fiber reinforcing material 8 to be wound, and the fiber reinforcing material 8 is arranged in the concave portion 9. May be. Thereby, it can prevent that the wound fiber reinforcement 8 remove | deviates from the cylindrical part 2. FIG. The recess 9 can also be applied to the first to fifth modifications. In this case, it is preferable to form the recessed part 9 according to the winding range of the fiber reinforcement 8 shown in each modification. In addition, in FIG.6 (g), in order to show arrangement | positioning of the recessed part 9, the fiber reinforcement 8 is abbreviate | omitted.

  Moreover, it is preferable to form the recessed part 9 in the groove | channel shape continuous in the circumferential direction of the outer peripheral surface of the cylindrical part 2, as shown in FIG.6 (g). Thereby, it can prevent more reliably that the wound fiber reinforcement material 8 remove | deviates from the cylindrical part 2. FIG. In addition, although illustration is abbreviate | omitted, instead of forming the recessed part 9, the convex part which protrudes in the radial direction outer side of the cylindrical part 2 is provided in the outer peripheral surface of the cylindrical part 2, and is cylindrical rather than the convex part. You may make it wind a reinforcement fiber in the position (base 6 side) of the axial direction inner side of the part 2. FIG.

<Seventh Modification>
You may roughen the said area | region by performing a roughening process to the area | region where the fiber reinforcement 8 is wound at least among the outer peripheral surfaces of the cylindrical part 2. FIG. By doing in this way, a cylindrical part by the anchor effect by the increase in the frictional resistance in the interface of the fiber reinforcement 8 and the outer peripheral surface of the cylindrical part 2, and the resin material of the fiber reinforcement 8 penetrates into a fine unevenness | corrugation. The fiber reinforcing material 8 can be firmly fixed to the outer peripheral surface 2. As roughening treatment, mechanical roughening treatment such as sandblasting treatment, chemical etching treatment in acid or alkaline aqueous solution, electrochemical roughening treatment using direct current or alternating current is applied. can do.

<Eighth Modification>
The fiber reinforcing material 8 may be bonded to the outer peripheral surface of the tubular portion 2 with an adhesive. Thereby, the fiber reinforcement 8 can be more reliably fixed to the outer peripheral surface of the cylindrical part 2. In particular, when the fiber reinforcing material 8 is wound around the outer peripheral surface of the roughened cylindrical portion 2, the adhesive can surely enter between the fine irregularities formed on the outer peripheral surface. Higher adhesion can be obtained. The adhesive is not particularly limited. For example, a commercially available thermosetting epoxy adhesive may be used as it is, or an adhesive prepared by mixing a commercially available epoxy resin main material, a curing agent, an elastomer, and the like. May be used.

<Ninth Modification>
In the above embodiment, the reinforcing fibers of the fiber reinforcement 8 are long fibers, but the reinforcing fibers may be short fibers as long as sufficient strength can be exhibited after thermosetting. Thereby, even when the cylindrical part 2 has a complicated external shape, the fiber reinforcing material 8 can be easily wound around the cylindrical part 2.

  Of course, the configurations shown in the above embodiment and the first to ninth modifications can be applied in appropriate combination. In these combination examples, it is possible to simultaneously obtain all the effects of the embodiment and the like related to the combination.

  As mentioned above, although embodiment of this invention and its modification were described, these embodiment etc. are only the illustrations described in order to make an understanding of this invention easy, and this invention is limited to the said embodiment etc. Is not to be done. The technical scope of the present invention is not limited to the specific technical matters disclosed in the above-described embodiments and the like, and includes various modifications, changes, alternative techniques and the like that can be easily derived therefrom.

  For example, in the above-described embodiment and the like, the suspension rod 1 has been described as an example of the suspension component to which the present invention is applied. However, the present invention is suitable as long as it is a suspension component having a cylindrical portion into which a press-fit body such as a bush is press-fitted. Can be applied to. For example, according to the present invention, a suspension arm having a substantially triangular shape or a horseshoe shape in a plan view such as an upper link and a lower link (for example, a suspension arm 31 in FIG. 7, a suspension arm 31A in FIG. 8, and a suspension arm 31B in FIG. 9 described later). The present invention can also be suitably applied to other suspension parts such as suspension links, or members constituting a part of the suspension parts (for example, an end member 41 in FIG. 10 described later).

  In the above-described embodiment and the like, the bush 4 is described as an example of the press-fit body that is press-fitted into the cylindrical portion 2. However, the press-fit body is not limited thereto, and may be another press-fit body such as a ball joint. Good. For example, in the case of the suspension arm 31 shown in FIG. 7, the present invention is applied to a ball joint press-fit portion 33 (tubular portion) that is connected to a plate-like connection portion 32 (connection portion) and into which a ball joint is press-fitted. The fiber reinforcing material 8 may be wound around the outer peripheral surface of the ball joint press-fit portion 33. In this case, the ball joint press-fit portion 33 has a cylindrical base portion 6 connected to the plate-like connection portion 32, and a first boss portion 7a formed to protrude from the base portion 6 to one side in the axial direction of the ball joint press-fit portion 33. And a second boss portion 7b formed to protrude from the base portion 6 to the other side in the axial direction. Then, the first fiber reinforcing material 8a is wound around the outer peripheral surface of the first boss portion 7a, and the second fiber reinforcing material 8b is wound around the outer peripheral surface of the second boss portion 7b.

  Further, as shown in FIG. 8, the present invention also applies to a suspension arm 31A in which two cylindrical portions 2 and a ball joint press-fit portion 33 (cylindrical portion) are connected by a plate-like connecting portion 32A (connecting portion). Can be applied. A punched hole 34 is provided in the central portion of the thin portion of the plate-like connecting portion 32A. As shown in FIG. 8B, a web 35 is formed around the punched hole 34 of the plate-like connecting portion 32A. A rib 36 having a predetermined thickness is formed on the side opposite to the hole 34 formed. Furthermore, as shown in FIG. 9, the present invention also applies to a suspension arm 31B in which two cylindrical portions 2 and a ball joint press-fit portion 33 (cylindrical portion) are connected by an arm-shaped connecting portion 32B (connecting portion). Can be applied. Of course, the configurations shown in the embodiment and the first to ninth modifications can be applied to the suspension arms 31, 31A, 31B.

  In the above-described embodiment and the like, the forging material obtained by forging and forming a slice material obtained by slicing a deformed continuous cast material has been described as an example of the suspension component material. However, the suspension component material is not limited thereto. Suspension component materials are, for example, those cut out from a normal cylindrical continuous cast material, those forged from a material cut out from an extruded extruded material, or die cast that has not been forged It may be a cast material such as a material or an extruded material, or a member formed by cutting an extruded material or a forged material.

  FIG. 10 shows an example of the end member 41 made of a member obtained by molding an extruded material or a forged material by cutting. This end member 41 is a member (a kind of suspension component) that constitutes a part of another suspension component, and other members (rod-like member, plate-like member, etc.) that constitute a connecting portion in the other suspension component. Are connected or fixed (joined by welding, friction welding or the like, or fastened by bolts). The end member 41 includes a cylindrical portion 42 (tubular portion) into which the press-fitted body is press-fitted, and a bracket 43 (connecting portion) for fixing the cylindrical portion 42 to another member. The cylindrical portion 42 includes a base portion 6 connected to the bracket 43, a first boss portion 7a formed to protrude from the base portion 6 to the axial direction one side of the cylindrical portion 42, and an axially other side of the cylindrical portion 42 from the base portion 6. And a second boss portion 7b formed to project. A first fiber reinforcing material 8a is wound around the outer peripheral surface of the first boss portion 7a, and a second fiber reinforcing material 8b is wound around the outer peripheral surface of the second boss portion 7b. Needless to say, the configuration shown in the embodiment and the first to ninth modifications can be applied to the end member 41.

  Furthermore, the material of the suspension component to which the present invention is applied may be, for example, a member formed by joining extruded materials, forged materials, or an extruded material and a forged material. FIG. 11 shows an example of a suspension link 51 formed by joining a plate-like member 52 (connecting portion) that is an extruded material and a cylindrical member 53 (cylindrical portion) that is an extruded material by welding. The tubular member 53 includes a tubular base portion 6 connected to the plate-like member 52, a first boss portion 7 a formed to protrude from the base portion 6 to the axial direction side of the tubular member 53, and a tubular portion from the base portion 6. And a second boss portion 7b formed so as to protrude to the other side of the axial member 53 in the axial direction. A first fiber reinforcing material 8a is wound around the outer peripheral surface of the first boss portion 7a, and a second fiber reinforcing material 8b is wound around the outer peripheral surface of the second boss portion 7b. Conventionally known MIG welding and TIG welding can be applied to the welding. Of course, the configuration shown in the above embodiment and the first to ninth modifications can also be applied to the suspension link 51. Furthermore, although illustration is omitted, even when a plate-like member (connecting portion) is subjected to burring to form a cylindrical rising portion (cylindrical portion), and a press-fit body is press-fitted into this rising portion, The present invention can be applied by winding a fiber reinforcement around the outer peripheral surface of the raised portion.

1 Suspension rod (suspension parts)
2 Cylindrical part 3 Rod part (connecting part)
4 bush 5 press-fitting hole 5a pressure receiving surface 6 base 7 boss 7a first boss 7b second boss 8 fiber reinforcement 8a first fiber reinforcement 8b second fiber reinforcement 8c prepreg 9 recess 31, 31A, 31B suspension arm (Suspension parts)
32, 32A Plate-like connecting part (connecting part)
32B Arm-shaped connecting part (connecting part)
33 Ball joint press-fit part (tubular part)
41 End member (suspension part)
42 Cylindrical part (tubular part)
43 Bracket (connecting part)
51 Suspension links (suspension parts)
52 Plate-shaped member (connecting part)
53 Cylindrical member (cylindrical part)

Claims (12)

A tubular part made of an aluminum alloy into which the press-fit body is press-fitted, and
A suspension component, comprising: a fiber reinforcement wound around an outer peripheral surface of the tubular portion. A connecting portion connected to the tubular portion;
The cylindrical portion includes a cylindrical base portion connected to the connecting portion, and at least one boss portion formed to project from the base portion in the axial direction of the cylindrical portion,
The suspension component according to claim 1, wherein the fiber reinforcing material is wound around at least an outer peripheral surface of the boss portion. The boss portion includes a first boss portion that protrudes from the base portion to one axial side of the tubular portion, and a second boss that protrudes from the base portion to the other axial side of the tubular portion. Department, and
The fiber reinforcing material includes a first fiber reinforcing material wound around an outer peripheral surface of the first boss portion and a second fiber reinforcing material wound around an outer peripheral surface of the second boss portion. The suspension component according to claim 2. The boss portion includes a first boss portion that protrudes from the base portion to one axial side of the tubular portion, and a second boss that protrudes from the base portion to the other axial side of the tubular portion. Department, and
The fiber reinforcing material is wound from the first boss portion to the second boss portion, the first fiber reinforcing material is wound from the first boss portion to the second boss portion, and the base portion The suspension component according to claim 2, further comprising a second fiber reinforcing material that intersects the first fiber reinforcing material on an outer peripheral surface.   5. The fiber reinforced plastic according to claim 1, wherein the fiber reinforced material is a fiber reinforced plastic including a reinforced fiber that is a long fiber and a resin material for fixing the reinforced fiber. 6. Suspension parts.   The suspension component according to any one of claims 1 to 5, wherein the fiber reinforcing material is formed of a unidirectional prepreg in which reinforcing fibers aligned in one direction are impregnated with a thermosetting resin.   The suspension component according to any one of claims 1 to 6, wherein the fiber reinforcing material covers an outer peripheral surface of the cylindrical portion. The cylindrical portion includes a pressure receiving surface that receives an elastic force from the press-fit body,
The suspension component according to any one of claims 1 to 7, wherein the fiber reinforcing material is located within a range of an axial length of the pressure receiving surface.   The outer peripheral surface of the cylindrical portion is provided with a recess formed along the fiber reinforcement, and the fiber reinforcement is disposed in the recess. The suspension component according to any one of the above.   The suspension according to any one of claims 1 to 9, wherein a roughening process is performed on at least a region of the outer peripheral surface of the tubular portion around which the fiber reinforcing material is wound. parts.   The suspension component according to any one of claims 1 to 10, wherein the fiber reinforcing material is bonded to an outer peripheral surface of the cylindrical portion with an adhesive. Suspension parts including a cylindrical part are formed by forging a forging material made of an aluminum alloy,
Wrap a fiber reinforcement around the outer peripheral surface of the tubular part,
A method for manufacturing a suspension component, wherein a press-fit body is press-fitted into a cylindrical portion around which the fiber reinforcement is wound.

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