WO2015049739A1 - サスペンション用アーム部材 - Google Patents
サスペンション用アーム部材 Download PDFInfo
- Publication number
- WO2015049739A1 WO2015049739A1 PCT/JP2013/076840 JP2013076840W WO2015049739A1 WO 2015049739 A1 WO2015049739 A1 WO 2015049739A1 JP 2013076840 W JP2013076840 W JP 2013076840W WO 2015049739 A1 WO2015049739 A1 WO 2015049739A1
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- WO
- WIPO (PCT)
- Prior art keywords
- support bar
- arm member
- suspension arm
- member according
- respect
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
- B60G7/001—Suspension arms, e.g. constructional features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
- B60G7/005—Ball joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/12—Mounting of springs or dampers
- B60G2204/122—Mounting of torsion springs
- B60G2204/1224—End mounts of stabiliser on wheel suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/416—Ball or spherical joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/10—Constructional features of arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/10—Constructional features of arms
- B60G2206/11—Constructional features of arms the arm being a radius or track or torque or steering rod or stabiliser end link
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/70—Materials used in suspensions
- B60G2206/71—Light weight materials
- B60G2206/7101—Fiber-reinforced plastics [FRP]
Definitions
- the present invention relates to a suspension arm member used to connect a plurality of members in a suspension mounted on a vehicle.
- the members are connected to each other so as to be swingable in the vertical direction or the like via a suspension arm member.
- the suspension arm member include a suspension arm that is attached to a vehicle body or an axle by a ball joint, a stabilizer link that connects a strut and a stabilizer, and the like. Since such a suspension arm member is required to have strength and rigidity, an iron member is generally used. Since a general stabilizer link has a support bar made of steel, it is heavier than a resin member or an aluminum member.
- Patent Document 1 a plastic rocking support described in Patent Document 1 is known as a material in which the weight of the suspension arm member is reduced in order to reduce the weight of the vehicle body.
- the plastic rocking support (suspension arm member) disclosed in Patent Document 1 has four intermediate chambers that are elongated in the longitudinal direction on the front and rear sides of the plastic base body, respectively, and has a total of eight intermediate chambers. is doing.
- the intermediate chamber includes a pair of front side center intermediate chambers arranged below the front side central portion of the plastic rocking support, and a pair of upper left and right outer lines with respect to the pair of front side center intermediate chambers.
- a pair of front side outer middle chambers arranged at symmetrical positions, a pair of rear side upper middle chambers located above the rear side central portion, and a pair of rear side upper middle chambers.
- a pair of rear chamber outer upper intermediate chambers arranged at line-symmetric positions on the lower left and right outer sides.
- the plastic rocking support has four intermediate moments in the longitudinal direction on the front and rear sides, and is formed in an S shape as viewed in a longitudinal section in the lateral direction.
- the load-bearing capacity is improved.
- the plastic rocking support disclosed in Patent Document 1 has four intermediate chambers (intermediate spaces) formed on the front side surface and the rear side surface, respectively, and is made of plastic. Although the reduction is aimed at, there is a demand for further weight reduction and manufacturing cost reduction.
- the plastic rocking support body is not formed in a vertically symmetrical shape with the center line as the center when viewed from the side. Therefore, it is irregularly deformed without being deformed into a vertically symmetrical shape.
- a plastic rocking support when used as a stabilizer link in an automobile, it rotates forward and backward around an axis extending in the longitudinal direction, so that a space for a circumscribed circle is required around the plastic rocking support. Then, when accessories are arranged around the stabilizer link, since the plastic swinging support body abuts on the accessories, a space for avoiding it is necessary, so it is difficult to design the vehicle layout. There was a problem.
- the plastic rocking support has a square shape in which the intermediate chamber formed in the support bar between the receiving elements at both ends has three lateral webs (ribs) in the upper, middle, and lower sides and two joints. It is formed in space. For this reason, when muddy sand or the like adheres to the back corner of the intermediate chamber, there is a problem that muddy sand or the like is difficult to leave.
- the plastic rocking support body has three flat webs in the upper, middle, and lower sides arranged in parallel, so it is strong against compressive force from the direction perpendicular to the axis, but the upper and lower horizontal webs.
- the plastic rocking support body has three flat webs in the upper, middle, and lower sides arranged in parallel, so it is strong against compressive force from the direction perpendicular to the axis, but the upper and lower horizontal webs.
- it is weak with respect to the behavior of shifting in the axial direction.
- the plastic rocking support has a tendency that stress is concentrated at the point where the transverse web formed in the lateral direction intersects with the coupling web formed in the vertical direction, and the acute corner is broken. There was a problem that it was easy.
- an object of the present invention is to provide a suspension arm member that is lighter and stronger.
- a suspension arm member includes a connection portion that connects a plurality of suspension members mounted on a vehicle, and the connection portions are provided at both ends, and extend in the longitudinal direction.
- a suspension arm member having a plurality of hollow portions formed in a concave shape in a direction perpendicular to the longitudinal direction, and formed of a resin material.
- the thinning portion is formed in a longitudinal direction at a front lower portion of the support bar and a plurality of front upper thinning portions formed in the longitudinal direction on the front upper portion of the support bar.
- a plurality of front lower hollow portions arranged alternately in the vertical direction, and formed longitudinally on the upper rear surface of the support bar, and alternately arranged in the front-rear direction with respect to the front upper hollow portion.
- a plurality of rear upper side wall portions, and a plurality of rear sides formed in a longitudinal direction at a lower portion of the rear surface of the support bar and arranged alternately with respect to the rear upper side wall portion and the front lower wall portion.
- And a lower part of the lightening portion are arbitrary directions here, Comprising: The transversal direction with respect to the surface in which the thinning part is formed is made into an up-down direction.
- the front-rear direction, the front side, and the rear side are arbitrary directions, and the depth direction in which the concave portion is formed is the front-rear direction.
- the suspension arm member has a plurality of hollow portions formed in a concave shape, and can be reduced in weight by being formed of the resin material.
- the thinning portion includes a front upper thinning portion formed in the upper front portion of the support bar, and a front lower thinning portion alternately arranged in the vertical direction with respect to the front upper thinning portion in the lower front portion of the support bar.
- the rear upper part of the support bar is alternately arranged on the rear upper part of the support bar with respect to the front upper part of the part, and the rear upper part of the support bar is alternately arranged on the lower part of the rear part of the support bar.
- a rear lower portion with a lower portion is
- the suspension arm has the thinning portions alternately arranged in the vertical direction and the longitudinal direction on the front and rear surfaces of the support bar, so the resin material for forming the support bar is reduced by the amount of the thinning.
- the cost can be reduced and the weight can be reduced, and the strength can be improved by the partition portion that forms the thinned portion.
- the portion of the support bar where the thinned portion is formed is formed in a substantially S-shape or a substantially inverted S-shape in a cross-sectional view in the short direction.
- the support bar is formed with a portion where the lightening portion is formed in a substantially S shape or a substantially inverted S shape in a cross-sectional view in the short direction.
- the rigidity of can be improved.
- the portion where the cutout portion is formed is orthogonal to the intermediate plate portion from the intermediate plate portion disposed in the center portion in a cross-sectional view in the short side direction and the both end portions of the intermediate plate portion.
- a rib portion formed in a direction opposite to each other, and a wing portion formed in parallel to a direction perpendicular to the rib portion from a tip portion of the rib portion, and the intermediate plate portion
- the thinned portion is preferably formed to satisfy T1 ⁇ T3 ⁇ T2.
- the thinned portion is formed such that the plate thickness T1 of the intermediate plate portion, the plate thickness T2 of the rib portion, and the plate thickness T3 of the wing portion satisfy T1 ⁇ T3 ⁇ T2.
- the thinned portion is formed with an inclination angle at which a side wall formed from the opening of the thinned portion toward the inner bottom portion expands with respect to the opening.
- the thinned portion is formed with an inclination angle such that the side wall formed from the opening portion toward the inner bottom portion expands toward the opening portion in the shape of a letter C when viewed in cross section.
- the side wall is formed so as to expand in the opposite direction with respect to the adjacent thinned portion.
- the side wall of the lightening portion is expanded in the opposite direction with respect to the adjacent lightening portion, so that the wing portion on the opening end side is prevented from falling by the truss effect. While being able to shape
- the inclination angle is any angle within a range of 91 degrees to 100 degrees with respect to the longitudinal center line of the support bar.
- the inclination angle of the side wall of the cutout portion is any angle within the range of 91 degrees to 100 degrees, so that the mold after resin molding can be easily removed.
- the strength of the support bar can be improved by inclining the side wall of the thinned portion so as to expand.
- each corner portion of the cutout portion is rounded with a predetermined radius of curvature.
- each corner portion of the cutout portion is rounded with a predetermined curvature radius, so that when other members collide with the corner portion, stress concentrates on the corner portion. It is possible to suppress damage.
- the resin material is preferably made of engineering plastic or super engineering plastic containing any of PA66, PA6, PPS, and POM.
- the resin material can be improved in strength and heat resistance by being made of engineering plastic or super engineering plastic.
- a fiber reinforcing material is added to the resin material.
- the resin material can improve rigidity and strength against temperature by adding a fiber reinforcing material.
- the present invention can provide a suspension arm member that is lighter and stronger.
- FIG. 1 It is a front view which has a partial cross section of the arm member for suspension which concerns on embodiment of this invention.
- (A) is an AA enlarged sectional view of FIG. 1, and (b) is an enlarged bottom view of a connecting portion of a suspension arm member.
- (A) is a side view of a support bar of a suspension arm member, and (b) is a cross-sectional view taken along the line BB of FIG. 3 (a).
- 3A is a cross-sectional view taken along the line CC in FIG. 3A
- FIG. 3B is a cross-sectional view taken along the line DD in FIG. 3A is a cross-sectional view taken along line EE in FIG. 3A, FIG.
- FIG. 3B is a cross-sectional view taken along line FF in FIG. 3A
- FIG. 3C is a cross-sectional view taken along line GG in FIG. ) Is a sectional view taken along line FF in FIG. It is a principal part expanded sectional view which shows the shape of a lightening part.
- the suspension arm member S according to the embodiment of the present invention will be described below with reference to FIGS.
- the direction of the suspension arm member S shown in FIG. 1 changes depending on the installation state and the attachment position of the vehicle to be installed. Therefore, for the sake of convenience, in the suspension arm member S, with reference to the case where the support bar 1 is arranged in the longitudinal direction, the depth direction of the thinned portion 10 formed on the support bar 1 is the front-rear direction, and the thickness of the support bar 1
- the short direction of the extraction part 10 will be described as the vertical direction
- the side on which the connecting parts 2 and 2 are arranged will be described as the left and right.
- the suspension (not shown) to which the present invention is applied will be described.
- the suspension is, for example, a vehicle such as an automobile, a two-wheeled vehicle, or a train, and is a device that mounts a vehicle body on the vehicle and cushions vibrations from the wheels, and includes a suspension arm member S.
- the suspension arm member S is an arm-shaped member provided in a suspension (not shown) mounted on the vehicle, and also includes members called links or rods.
- the suspension arm member S is, for example, a suspension arm or a stabilizer link.
- the suspension arm member S may be any member that has a support bar 1 to be described later and is used for a suspension (not shown), and the type, type, and location of the suspension are not particularly limited.
- the present invention will be described by taking the case of a stabilizer link as an example.
- the suspension arm member S includes a pair of connecting portions 2 and 2 for connecting a plurality of suspension members mounted on a vehicle, and the connecting portions 2 and 2 are provided at both ends.
- An arm-shaped (link-shaped) member having a support bar 1 extending in the longitudinal direction.
- the suspension arm member S includes a ball seat 3 which will be described later on the housing portions 2a of the connecting portions 2 and 2 at both ends, and a stud bolt 4 having a ball portion 4a which is rotatably installed in the ball seat 3.
- a dust boot 5 for preventing dust and the like from entering the ball portion 4a is provided.
- the suspension arm member S has a total length L1 (see FIG. 4B) of about 330 mm.
- the suspension arm member S is formed of an engineering plastic or super engineering plastic resin material including any of so-called PA66, PA6, PPS, and POM.
- the resin material is added with a fiber reinforcing material made of thin fibers such as glass fiber and carbon fiber to improve the strength.
- the content of the fiber reinforcing material in the resin material is preferably 25% or more so that the reinforcing effect and the high temperature (80 ° C.) strength do not become 50% or less as compared with normal temperature (23 ° C.).
- the upper limit of the content of the fiber reinforcing material is about 60% in consideration of the life of the injection molding machine in terms of moldability.
- engineing plastic refers to a high-performance plastic that has a heat resistance of 100 ° C. or higher, a tensile strength of 50 MPa or higher, a flexural modulus of 2.4 GPa or higher, and is suitable for structural and mechanical members.
- the “super engineering plastic” refers to an engineering plastic that has higher heat resistance and can be used for a long time even at a high temperature of 150 ° C. or higher.
- PA66 is a polyamide-based resin and is also called nylon 66.
- PA66 is a synthetic fiber, and is an engineering plastic that has a high degree of crystallinity in the polyamide-based resin and has a good balance of physical properties, and is superior in heat resistance and mechanical strength compared to PA6.
- PA66 has excellent mechanical strength balance and chemical resistance, and has the most excellent mechanical strength among nylon resins (polyamide resins).
- PA 66 can be reinforced with a filler, and can be filled with glass fiber or the like to greatly improve mechanical strength, rigidity, heat distortion temperature, and the like.
- PA6 is a polyamide resin and is also called nylon 6.
- PA6 has a melting point of 225 ° C., a heat resistant temperature of 80 to 140 ° C., a specific gravity of 1.13, a color of milky white, and is excellent in wear resistance, cold resistance, impact resistance, oil resistance, and alkali resistance.
- PPS is a polyphenylene sulfide resin, which is a high-performance resin having a molecular structure in which phenyl groups (benzene rings) and sulfur (S) are alternately repeated.
- PPS is a crystalline resin that has extremely high heat resistance (continuous use temperature of about 240 ° C), continuous use temperature of 200 ° C to 220 ° C, and heat deflection temperature under a high load (1.82 MPa) of 260 ° C or higher. Excellent tensile strength and bending strength.
- PPS has a small shrinkage ratio of 0.3 to 0.5% during molding and good dimensional stability.
- PPS is excellent in mechanical strength, rigidity, flame retardancy, chemical resistance, electrical characteristics, dimensional stability, and the like.
- POM is a polyacetal, a crystalline resin having balanced mechanical properties, and is particularly excellent in fatigue resistance. Excellent friction / wear resistance, chemical resistance, creep resistance, dimensional stability and low water absorption.
- the support bar 1 is a rod-shaped portion provided between the connecting portions 2 and 2 at the left and right end portions, and is integrated with the connecting portions 2 and 2 by a resin material. Is formed.
- the support bar 1 is formed in a concave shape in a direction (front-rear direction) orthogonal to the longitudinal direction (left-right direction), and a plurality of meat-cutting portions 10 arranged in two upper and lower stages, and a meat-cutting portion in front view 10 and the end side side hollow part 15 formed in a row from the right and left both sides to the connecting part 2 of the left and right end parts.
- the support bar 1 has, for example, the longest length L2 in the front-rear direction at the center portion of about 26.2 mm in plan view, and the length L3 in the front-rear direction of the end portion (neck portion 1e) near the connecting portion 2 is 20. It is formed to be the thinnest at .83 mm, and gradually decreases from the center to both ends.
- the support bar 1 is, for example, as viewed from the side, the height H1 in the vertical direction of the center portion is the longest at about 19.6 mm, and the height H2 in the vertical direction at the left and right ends is the thinnest at 15.40 mm. It is formed so as to become thinner gradually from the center to both ends. Further, as shown in FIGS.
- the support bar 1 is provided on each of the corner portions 10d where the planes such as the thinned portions 10 intersect with each other, as will be described later.
- a rounded surface Rc is formed and rounded with a predetermined radius of curvature.
- the portion of the support bar 1 where the thinned portion 10 is formed is substantially S-shaped (substantially self-shaped) or substantially inverted S-shaped in a longitudinal section. It is formed in a shape (substantially inverted self-letter shape).
- the portion of the support bar 1 where the thinned portion 10 is formed has an intermediate plate portion 10e, a rib portion 10f, and a wing portion 10g, which will be described later.
- the support bar 1 is formed in a substantially S shape or a substantially inverted S shape when viewed in a longitudinal section, so that the support bar 1 is compared with an I shape when viewed in a longitudinal section.
- the rib part 10f and the wing part 10g are arrange
- the lightening portion 10 is a space having a concave shape when viewed from the cross section formed on the front and rear surfaces of the support bar 1 and the outer peripheral surfaces of the connecting portions 2, 2. It is formed for the purpose of reducing the weight of the member S.
- the lightening part 10 includes a front upper lightening part 11, a front lower lightening part 12, a rear upper lightening part 13, a rear lower lightening part 14, and an end side lightening part 15. It is prepared for. As shown in FIG.
- the thinned portion 10 has an opening portion in which the side wall 10c formed from the opening portion 10a of the thinned portion 10 toward the inner bottom portion 10b has a square shape when viewed in cross section. It is formed with an inclination angle ⁇ that expands toward 10a.
- the inclination angle ⁇ is formed at any angle within the range of 91 degrees to 100 degrees with respect to the center line in the left and right (longitudinal) direction of the support bar 1. For this reason, the thinned portion 10 is formed to expand so that the diameter gradually increases from the inner bottom portion 10b toward the opening portion 10a.
- FIG. 1 FIG. 3 (b) and FIG. 4 (b)
- the opening 10a and the side wall 10c are represented by straight lines for the sake of convenience, but in actuality, the opening end and bottom end of the opening 10a are omitted. There is a gap (step).
- the front upper thinning portion 11 can be formed in the front upper portion 1 a of the support bar 1 in the longitudinal direction so that a rear upper thinning portion 13 (see FIG. 1) can be formed. It is comprised from the four thinning parts 10 formed in a row through the space
- the front side upper part 11 has a pair of first front side upper parts 11a arranged at positions closer to the left and right central parts around the central part in the left and right (longitudinal) direction, and the pair of first front parts.
- a pair of second front side upper portion portions 11b disposed at positions near the connecting portions 2 and 2 of the upper portion portion 11a are arranged symmetrically.
- the lengths L11 in the left-right direction of the four front upper cutout portions 11 are all the same length, for example, 20 mm.
- the front upper thinning portion 11 includes four front upper meats as the height of the support bar 1 gradually decreases from the vertical height H1 of the central portion toward the length H2 of both ends.
- the vertical heights H11a and H11b of the extraction part 11 are also formed so as to decrease in proportion thereto.
- Each front upper hollow portion 11 is formed in a trapezoid that is long in the horizontal direction, with the height H11a on the center side of the support bar 1 higher than the height H11b on the connecting portions 2 and 2 side. That is, each front side upper portion 11 is such that the upper wing portion 10g is lowered from the center side of the support bar 1 toward the connecting portions 2 and 2 with respect to the intermediate plate portion 10e extending in the horizontal direction. Inclined.
- the four front upper cutout portions 11 formed in this way are arranged on the right side with two front upper cutout portions 11 arranged on the left side with the longitudinal center portion of the support bar 1 as the center.
- the two front upper hollow portions 11 are formed symmetrically and are arranged symmetrically.
- the front upper hollow portion 11 is such that the support bar 1 has the longest length L2 in the front-rear direction of the center portion and the shortest length L3 in the front-rear direction of the neck portion 1e. Is formed.
- positioned in the position near the center part is formed deeper than the depth D11 of the front side upper part hollow part 11 arrange
- the front lower portion hollow portions 12 are formed in the front lower portion 1 b of the support bar 1 in the longitudinal direction, and alternately staggered in the vertical direction with respect to the front upper portion hollow portion 11. It is comprised from the 5 meat
- This front lower part hollowing part 12 is formed in a horizontal line through the installation space
- the front lower part hollowing part 12 is centered on the central part in the longitudinal direction, and the left and right connecting parts 2, 2 of the first front lower part hollowing part 12a disposed at the central part and the first front lower part hollowing part 12a.
- the part 12c is arranged symmetrically.
- the five front side lower part 12 are the lengths in the left and right directions of the first front side lower part 12a and the second front lower part 12b arranged near the center. 11, the length of the third front side lower portion 12c arranged closest to the connecting portions 2 and 2 is formed to be a length L12 (for example, 30 mm) longer than the length L11. ing.
- the height of the support bar 1 gradually decreases from the vertical height H ⁇ b> 1 of the central portion toward the length H ⁇ b> 2 of both ends. Accordingly, the heights H12a and H12b in the vertical direction of the five front lower hollow portions 12 are also formed so as to decrease in proportion thereto.
- the first front side lower portion 12a in the center is formed in a rectangular shape.
- the second front side lower part 12 b and the third front side lower part 12 c other than the first front side part 12 a are similar to the front upper part 11 in the support bar 1.
- the height H12a on the center side is formed higher than the height H12b on the connecting portion 2 and 2 side, and is formed in a trapezoid shape that is long in the horizontal direction. That is, the second front lower part hollowing part 12b and the third front lower part hollowing part 12c are connected from the center side of the support bar 1 to the intermediate plate part 10e in which the lower wing part 10g extends in the horizontal direction. It is formed to be inclined so as to become lower toward the second and second sides. For this reason, each of the pair of left and right second front-side lower hollowing portions 12b and third front-side lower hollowing portion 12c is symmetrically arranged with the first front-side lower hollowing portion 12a as the center. .
- the front lower part hollowing part 12 has a left and right centering on the first front lower part hollowing part 12a arranged in the center part when the support bar 1 is viewed in cross section. From the first front lower part thinning part 12a to the first rear lower part parting part 14a, the second front lower part parting part 12b, the second rear lower part parting part 14b, and the third front side lower part. It is formed in the order of the cutout portion 12c.
- the front lower portion 12 has a first front lower portion 12a having the longest length L2 in the front-rear direction at the center, and is disposed in the front-rear direction on the left and right neck portions 1e.
- the third front lower hollow portion 12c having the shortest length L3 is disposed, and is continuously formed in a concavo-convex shape so as to be reduced from the central portion toward the neck portion 1e.
- the rear upper side wall portions 13 are formed in the longitudinal direction on the rear surface upper portion 1 c of the support bar 1, and are continuously arranged alternately in the front-rear direction with respect to the front side upper wall portion 11. It consists of a plurality of cutout portions 10.
- the rear upper thinning portion 13 13a to 13c
- the front lower thinning portion 12 FIG. 4
- FIG. 4 See (a)). For this reason, detailed description is omitted.
- the rear lower portion 14 is formed in the longitudinal direction on the rear lower portion 1d of the support bar 1, and the rear upper portion 13 (see FIG. 4 (b)) and the front side are formed. It consists of a plurality of lightening portions 10 arranged alternately with respect to the lower lightening portion 12.
- the rear lower portion 14 (14a, 14b) is formed symmetrically with the above-described front upper portion 11 (see FIG. 3B) disposed on the front upper side in a cross-sectional view. Yes. For this reason, detailed description is omitted.
- each side wall 10 c is a partition wall formed on the left and right inner surfaces when the thinned portion 10 is viewed from the front-rear direction, and is formed in the vertical direction. As shown in FIG. 3 (b), the side wall 10c is formed so as to expand in the opposite direction with respect to the adjacent thinned portion 10 (see FIG. 4 (a)).
- the plate thickness of the side wall 10c is formed to a thickness of about 2 mm, similar to the plate thickness T2 of the rib portion 10f described later.
- each of the corner portions 10d is always formed with a radius Ra, Rb or a spherical radius surface Rc.
- the support bar 1 is formed with a radius Ra, Rb or a spherical radius surface Rc (see FIG. 6) at the corner 10d, so that when an external force is applied to the corner 10d, the stress is locally applied. Prevents concentration.
- a rounded portion Ra having a radius of about R 0.5, for example, is formed on the corner portion 10d outside the thinned portion 10.
- the rib portion 10 f (inner bottom portion 10 b), the side wall 10 c and the intermediate plate portion 10 e intersect with the rib portion 10 f (inner bottom portion 10 b), the rib portion 10 f (inner bottom portion 10 b), and the rib portion.
- the intermediate plate portion 10e is horizontally aligned with the center portion in the vertical direction of the support bar 1 formed in a substantially S-shape or a substantially inverted S-shape in a cross-sectional view in the short side direction. It is a thick plate-shaped part arranged. Since the intermediate plate portion 10e is arranged at the center portion of the support bar 1 when viewed in a longitudinal section, it is arranged at a position where a large moment is not applied when an external force is applied. It is possible to reduce the thickness. For this reason, the intermediate
- the rib portions 10f are opposite to each other in the direction orthogonal to the intermediate plate portion 10e from the both end portions of the intermediate plate portion 10e (upward or downward direction). It is a thick plate-shaped part formed toward the head, and is formed between the intermediate plate part 10e and the wing part 10g.
- the rib portion 10f is thinner than the intermediate plate portion 10e, and is formed with a plate thickness T2 of about 2.0 mm, for example.
- the wing portion 10g is formed in a direction perpendicular to the rib portion 10f from the tip portion of the rib portion 10f, and is formed in parallel to the intermediate plate portion 10e. This is a thick plate-shaped part.
- the wing portion 10g is formed thicker than the intermediate plate portion 10e because a larger moment is applied to the wing portion 10g than the intermediate plate portion 10e by the distance from the central portion when an external force is applied. If a specific example is given, the wing part 10g will be formed by plate
- the support bar 1 has an intermediate plate portion 10e having a thickness T1 (2 mm or more, preferably 2 to 3 mm), a rib portion 10f having a plate thickness T2 (1 mm or more, preferably 1 to 2 mm), and a wing portion 10g.
- T1 2 mm or more, preferably 2 to 3 mm
- rib portion 10f having a plate thickness T2 (1 mm or more, preferably 1 to 2 mm
- wing portion 10g When the plate thickness is T3 (3 mm or more, preferably 3 to 4 mm), the thinned portion 10 is T1 ⁇ T3 ⁇ T2 It is formed to become.
- the end side hollow portion 15 is a recess formed for the purpose of reducing the weight of the suspension arm member S, as with the thin portion 10. It is.
- the end side cutout portions 15 are formed through the left and right partition walls 15a from the vicinity of the neck portion 1e of both ends of the support bar 1 to the flange portion 2d formed on the outer periphery of the connecting portion 2.
- the end side cutout portion 15 formed in the shape of a recess has a left and right partition wall 15a that forms a horizontal partition, an upper and lower wall portion 15b that forms a vertical wall, and a front and rear partition that forms a front and rear partition.
- the left and right partition walls 15a and the front and rear partition walls 15c are formed to have substantially the same thickness (for example, a thickness of about 2 mm), and the thickness of the upper and lower wall portions 15b (for example, about 3 mm). It is formed thinner than.
- the left and right partition walls 15a are formed of flat plate-like standing walls that are formed straight in the front-rear direction at predetermined intervals from the left and right ends of the front and rear partition walls 15c and the outer periphery of the housing part 2a.
- the upper and lower wall portions 15b are horizontal walls that form the upper and lower surfaces of the neck portion 1e of the support bar 1 and the flange portion 2d of the connecting portion 2, and are formed continuously from the wing portion 10g in the left-right direction.
- the front / rear partition wall 15c is a vertical wall that divides the end side cutout portion 15 formed back-to-back in the front-rear direction, and is formed along the center line of the support bar 1 in plan view. .
- the connecting portions 2 and 2 are portions for connecting the suspension members, and are formed at both ends of the support bar 1, respectively.
- the connecting part 2 includes a substantially container-shaped housing part 2a integrally formed at both ends of the support bar 1, a concave part 2b formed in the housing part 2a, and an attachment hole formed in the inner bottom of the concave part 2b. 2c and a flange portion 2d formed on the outer peripheral portion of the housing portion 2a.
- the right connecting portion 2 is formed in a symmetrical shape with respect to the left connecting portion 2.
- the housing portion 2a is a portion to which a ball seat 3 that rotatably supports the ball portion 4a of the stud bolt 4 is fitted, and is formed in a substantially bottomed cylindrical shape.
- the concave portion 2b is formed of a cylindrical recess and is formed in a direction orthogonal to the direction in which the support bar 1 is extended.
- the attachment hole 2c is a through hole into which a rivet-shaped heat crimping portion 3a formed to protrude from the lower end surface of the ball seat 3 is inserted and attached.
- the flange portion 2d is a substantially thick plate-shaped reinforcing portion formed on the outer peripheral portion of the housing portion 2a, and is formed in a substantially C-ring shape in plan view.
- the flange portion 2d maintains the strength of the connecting portion 2 by being formed on the outer peripheral portion of the housing portion 2a.
- the flange portion 2d is formed with an end portion side hollow portion 15 (see FIG. 5D) that is open in the front-rear direction.
- the ball seat 3 is a bearing member that forms a bibot bearing that pivotally supports the ball portion 4 a of the stud bolt 4.
- the ball seat 3 includes a plurality of rivet-shaped heat caulking portions 3a, an oil reservoir portion 3b for storing lubricating oil, a spherical surface portion 3c formed in accordance with the shape of the ball portion 4a, and an opening of the concave portion 2b. And a flange 3d disposed at the edge.
- the stud bolt 4 is a metal bolt that functions as a shaft portion rotatably disposed on the connecting portion 2 and a connecting bolt.
- the stud bolt 4 includes a ball portion 4a formed on the base end side to form a ball joint, a boot engaging groove 4b into which a distal end side opening 5a of the dust boot 5 is fitted, and a suspension member (not shown).
- the rotation prevention protrusion (illustration omitted) which prevents the connected suspension member from loosening is formed in the base end part of the external thread part 4c.
- the dust boot 5 is a rubber boot that covers the upper outer peripheral portion of the ball portion 4a, and is provided on the ball seat 3 and the stud bolt 4 so as to be able to contract vertically and horizontally.
- the dust boot 5 is formed between a distal end side opening 5a formed on the distal end side, a proximal end side opening 5b formed on the proximal end side, and between the distal end side opening 5a and the proximal end opening 5b. And a deformable cover portion 5c.
- grease for a ball joint for lubricating the ball portion 4a is injected.
- the support bar 1 of the suspension arm member S shown in FIG. 1 is formed by resin-molding a resin material made of engineering plastic or super engineering plastic containing any of PA66, PA6, PPS, and POM to which a fiber reinforcing material is added. .
- the support bar 1 is provided with strength, rigidity, and heat resistance.
- the support bar 1 has a plurality of lightening portions 10 and end side lightening portions 15 formed in a recessed shape, and is formed of a resin material, thereby forming the support bar 1 by the amount of lightening. It is possible to reduce weight and cost by reducing the resin material to be used. Further, the strength of the support bar 1 can be improved by the partition portion that forms the thinned portion 10.
- the thinning part 10 is the front side upper thinning part 11 formed in the longitudinal direction at the front upper part 1a of the support bar 1, and the support bar 1 of FIG.
- the front lower portion 12 is disposed in the front lower portion 1b alternately in the vertical direction with respect to the front upper portion 11, and the front upper portion 1c of the support bar 1 is alternately disposed in the front and rear direction with respect to the front upper portion 11.
- the rear upper thinning portion 13 arranged on the rear side and the rear lower thinning portion 14 arranged alternately on the lower rear surface 1d of the support bar 1 with respect to the rear upper hollowing portion 13 and the front lower hollowing portion 12.
- the suspension arm member S has the thinned portions 10 arranged alternately in the vertical direction and the longitudinal direction on the front and rear surfaces of the support bar 1, so that the resin that forms the support bar 1 by the amount of the thinned portion is formed. Material can be reduced to reduce costs and weight.
- the support bar 1 has a large number of formed hollow portions 10 and end-side hollow portions 15 that are arranged symmetrically about the center line in the vertical and horizontal directions, so that an external force is applied. The external force can be absorbed by the entire support bar 1 with a good balance.
- the support bar 1 has a portion in which the thinned portion 10 is formed in a substantially S-shape or a substantially inverted S-shape in a cross-sectional view in the short direction. By being formed, the rigidity of the thinned portion 10 can be improved.
- the thinning portion 10 has a plate thickness T1 of the intermediate plate portion 10e, a plate thickness T2 of the rib portion 10f, and a plate thickness T3 of the wing portion 10g. T1 ⁇ T3 ⁇ T2
- T1 ⁇ T3 ⁇ T2 The resin fluidity at the time of resin molding can be applied in descending order of strength requirements. For this reason, the rigid support bar 1 can be obtained.
- the thinning portion 10 has a side wall 10c formed from the opening 10a of the thinning portion 10 toward the inner bottom portion 10b in a cross-sectional view with respect to the opening 10a. It is formed with an inclination angle ⁇ so as to expand in a letter-shape. For this reason, since the support bar 1 can be easily removed when the mold is removed after resin molding, it is possible to eliminate the formation of burrs and the like and to improve the workability of the mold work. Can do. Moreover, the side wall 10c is resin-molded so as to prevent the wing portion 10g on the opening end side from falling due to the truss effect by being formed to expand in the opposite direction with respect to the adjacent cutout portion 10. In addition, the strength in the direction around the axis can be equalized.
- the suspension arm member S is formed by screwing stud bolts 4 and 4 provided at both ends of the support bar 1 into female screw portions of a suspension member (not shown). Connected to the lower portion of the vehicle body. For this reason, even if mud sand or the like enters the meat extraction portion 10 while the vehicle is running, the vehicle is formed with an inclination angle ⁇ of 91 degrees to 100 degrees at which the meat extraction portion 10 expands. The mud sand etc. can be discharged automatically by the vibration of.
- each corner 10d of each cutout portion 10 is rounded with a predetermined radius of curvature (the radius Ra, Rb, the spherical radius surface Rc), thereby driving the vehicle.
- a predetermined radius of curvature the radius Ra, Rb, the spherical radius surface Rc
- the stabilizer link has been described as an example of the suspension arm member S. However, it may be in the shape of an arm used for the suspension, and the application and installation location are not particularly limited.
- the support bar 1 should just have the front side upper part hollowing part 11, the front side lower part hollowing part 12, the rear side upper part thinning part 13, and the rear side lower part hollowing part 14, and the number of the thinning parts 10 is sufficient.
- the size and shape may be appropriately changed depending on the size of the suspension arm member S. For example, when the support bar 1 is large, the lightening part 10 increases the number of the lightening parts 10 in the left-right direction or increases the number of the lightening parts 10 in the vertical direction by three, four, and five. It may be added to the stage as appropriate.
Abstract
Description
その中間室は、プラスチック揺動支持体の前側側面の中央部下側に配置した一対の前側面中央部の中間室と、その一対の前側面中央部の中間室に対して左右外側の上側の線対称な位置にそれぞれ配置した一対の前側面外側の中間室と、後側側面の中央部上側に配置した一対の後側面上側中央部の中間室と、その一対の後側面上側中央部の中間室に対して左右外側の下側の線対称な位置にそれぞれ配置した一対の後側面外側上部の中間室と、から成る。
なお、ここで上下方向、上部及び下部は、任意の方向であって、肉抜部が形成されている面に対する短手方向を上下方向とする。また、前後方向、前側及び後側は、任意の方向であって、凹部状の肉抜部が形成されている深さ方向を前後方向とする。
なお、図1に示すサスペンション用アーム部材Sは、設置する車両に設置状態や、取付位置によってその向きが変化する。このため、便宜上、サスペンション用アーム部材Sにおいて、サポートバー1を長手方向に配置した場合を基準として、サポートバー1に形成された肉抜部10の深さ方向を前後方向、サポートバー1の肉抜部10の短手方向を上下方向、連結部2,2が配置されている側を左右として以下説明する。
まず、本発明の実施形態に係るサスペンション用アーム部材Sを説明する前に、本発明が適用されるサスペンション(図示省略)について説明する。
サスペンション(図示省略)は、例えば、自動車や二輪車や電車等の車両で、車体をその上に載せて、車輪からの振動を緩衝させる装置であって、サスペンション用アーム部材Sを備えている。
サスペンション用アーム部材Sは、車両に搭載されたサスペンション(図示省略)に備えられたアーム形状の部材であり、このほかリンクあるいはロッドといわれている部材も含む。サスペンション用アーム部材Sは、例えば、サスペンションアームあるいはスタビライザリンク等である。サスペンション用アーム部材Sは、後記するサポートバー1を有してサスペンション(図示省略)に使用される部材であればよく、サスペンションの形式、種類、使用される箇所等は特に限定されない。以下、スタビライザリンクの場合を例に挙げて本発明を説明する。
図4(a)、(b)に示すように、サポートバー1は、左右端部の連結部2,2間に設けられたロッド形状の部位であり、樹脂材料によって連結部2,2に一体形成されている。サポートバー1は、長手方向(左右方向)に直交する方向(前後方向)に向けて凹部状に形成され、上下二段に配置された複数の肉抜部10と、正面視して肉抜部10の左右両側から左右端部の連結部2に亘って一列に形成された端部側肉抜部15と、を有している。
サポートバー1は、例えば、平面視して、中央部の前後方向の長さL2が26.2mm程度で最も長く、連結部2寄りの端部(首部1e)の前後方向の長さL3が20.83mmで最も細く形成されて、中央部から両端部側に亘って段々と縮小するように形成されている。サポートバー1は、例えば、側面視して、中央部の上下方向の高さH1が19.6mm程度で最も長く、左右端の上下方向の高さH2が15.40mmで最も細く形成されて、中央部から両端に亘って段々と細くなるように形成されている。また、図5(a)~(c)に示すように、サポートバー1は、肉抜部10等の平面が交差する全ての各角部10dに、それぞれ後記するアールRa,Rb、または、球アール面Rcが形成されて、所定の曲率半径で丸められている。
図1に示すように、肉抜部10は、サポートバー1の前面及び後面と、連結部2,2の外周面とにそれぞれ形成された断面視して凹部形状の空間であり、サスペンション用アーム部材Sの軽量化を目的として形成されている。肉抜部10は、前側上部肉抜部11と、前側下部肉抜部12と、後側上部肉抜部13と、後側下部肉抜部14と、端部側肉抜部15と、を備えて構成されている。
図3(b)に示すように、肉抜部10は、この肉抜部10の開口部10aから内底部10bに向けて形成された側壁10cが、断面視してハの字状に開口部10aに向けて拡開する傾斜角度θをつけて形成されている。その傾斜角度θは、サポートバー1の左右(長手)方向の中心線に対して91度から100度の範囲内のいずれかの角度に形成されている。このため、肉抜部10は、内底部10bから開口部10aに向けて口径が徐々に大きくなるように拡開して形成されている。
なお、図1、図3(b)及び図4(b)では、便宜上、開口部10a及び側壁10cを直線で表現して省略しているが、実際は、開口部10aの開口端と底端とにズレ(段差)がある。
図3(a)に示すように、前側上部肉抜部11は、サポートバー1の前面上部1aに長手方向に、後側上部肉抜部13(図1参照)を形成することが可能な設置間隔を介して一列に形成された4つの肉抜部10から構成されている。前側上部肉抜部11は、左右(長手)方向の中央部を中心として、その左右の中央部寄りの位置に配置された一対の第1前側上部肉抜部11aと、この一対の第1前側上部肉抜部11aの連結部2,2寄りの位置に配置された一対の第2前側上部肉抜部11bと、を左右対称に配置して構成されている。4つの前側上部肉抜部11の左右方向の長さL11は、全て同じ長さであり、例えば、20mmである。
図3(a)、(b)に示すように、前側下部肉抜部12は、サポートバー1の前面下部1bに長手方向に形成され、前側上部肉抜部11に対して上下方向に互い違いに配置された5つの肉抜部10から構成されている。この前側下部肉抜部12は、サポートバー1の長手方向の中央部から後側下部肉抜部14(図4(a)参照)を形成することが可能な設置間隔を介して横一列に形成されている。前側下部肉抜部12は、長手方向の中央部を中心として、その中央部に配置された第1前側下部肉抜部12aと、第1前側下部肉抜部12aの左右の連結部2,2寄りの位置に配置された一対の第2前側下部肉抜部12bと、第2前側下部肉抜部12bの左右の連結部2,2寄りの位置に配置された一対の第3前側下部肉抜部12cと、を左右対称に配置して構成されている。5つの前側下部肉抜部12は、中央部寄りの位置に配置された第1前側下部肉抜部12a及び第2前側下部肉抜部12bの左右方向の長さが、前記前側上部肉抜部11と同じ長さL11であり、最も連結部2,2寄りに配置された第3前側下部肉抜部12cの長さが、長さL11よりも長い長さL12(例えば、30mm)に形成されている。
図3(b)に示すように、後側上部肉抜部13は、サポートバー1の後面上部1cに長手方向に形成され、前側上部肉抜部11に対して前後方向に互い違いに連続配置された複数の肉抜部10から成る。この後側上部肉抜部13(13a~13c)は、図4(b)に示すように、横断面視して、その前側下側に配置される前記した前側下部肉抜部12(図4(a)参照)と対称に形成されている。このため、詳しい説明は、省略する。
図4(a)に示すように、後側下部肉抜部14は、サポートバー1の後面下部1dに長手方向に形成され、後側上部肉抜部13(図4(b)参照)及び前側下部肉抜部12に対して互い違いに配置された複数の肉抜部10から成る。この後側下部肉抜部14(14a,14b)は、横断面視して、その前側上側に配置される前記した前側上部肉抜部11(図3(b)参照)と対称に形成されている。このため、詳しい説明は、省略する。
図1に示すように、各側壁10cは、肉抜部10を前後方向から見て、左右の内側面に形成された仕切り壁であり、上下方向に向けて形成されている。図3(b)に示すように、側壁10cは、隣接する肉抜部10に対して逆方向に拡開して形成されている(図4(a)参照)。側壁10cの板厚は、後記するリブ部10fの板厚T2と同様に、2mm程度の厚さに形成されている。
図5(a)~(c)に示すように、サポートバー1において、各角部10dには、アールRa,Rb、または、球アール面Rcが必ず形成されている。サポートバー1は、角部10dにアールRa,Rb、または、球アール面Rc(図6参照)が形成されていることにより、外力が角部10dに負荷された際に、応力が局部的に集中するのを防止している。
肉抜部10のウイング部10gの辺、及び、リブ部10f(内底部10b)の辺を形成する角部10dには、例えば、アールRaよりも大きいR=1mmあるいはR=1mm以上(好ましくはR=1mm~3mm)の曲率半径からなるアールRbが形成されている。
また、図6に示すように、肉抜部10のリブ部10f(内底部10b)と側壁10cと中間板部10eとが交差する角部10dと、リブ部10f(内底部10b)とリブ部10fとウイング部10gとが交差する角部10dとは、アール面の曲率半径をR=1mmあるいはR=1mm以上(好ましくはR=1mm~3mm)からなる球アール面Rcが形成されている。
図2(a)に示すように、中間板部10eは、短手方向に断面視して略S字状または略逆S字状に形成されたサポートバー1の上下方向の中央部に水平に配置された厚板状の部位である。この中間板部10eは、サポートバー1おいて、縦断面視して中央部に配置されていることにより、外力が負荷された際に、大きなモーメントが負荷されない位置に配置されているので、厚さを薄くすることが可能になっている。このため、中間板部10eは、2mm以上の板厚T1に形成されて、ウイング部10gよりも薄く形成されている。中間板部10eは、更に具体的には、例えば、2.1mm程度の板厚T1で形成されている。
図5(a)~(c)に示すように、リブ部10fは、中間板部10eの両端部からその中間板部10eに対して直交する方向で相互に反対方向(上方向または下方向)に向けて形成された厚板状の部位であり、中間板部10eとウイング部10gとの間に形成されている。リブ部10fは、中間板部10eよりも薄く、例えば、2.0mm程度の板厚T2に形成されている。
図5(a)~(c)に示すように、ウイング部10gは、リブ部10fの先端部からそのリブ部10fに対して直交する方向に形成され、中間板部10eに対して平行に形成された厚板状の部位である。ウイング部10gは、外力が負荷された場合、中心部から離れている分だけ中間板部10eよりも大きなモーメントがかかるため、中間板部10eよりも厚く形成されている。ウイング部10gは、具体的な一例を挙げると、3.0mmの板厚T3で形成されている。
T1<T3<T2
になるように形成されている。
図1及び図3(a)、(b)に示すように、端部側肉抜部15は、前記肉抜部10と同様に、サスペンション用アーム部材Sの軽量化を目的として形成された窪みである。端部側肉抜部15は、サポートバー1の両端部の首部1e近傍から連結部2の外周に形成されたフランジ部2dに亘って左右仕切壁15aを介して形成されている。凹部形状に形成された端部側肉抜部15は、左右方向の仕切りを形成する左右仕切壁15aと、上下方向の壁を形成する上下壁部15bと、前後方向の仕切りを形成する前後仕切壁15cと、から形成されている。
端部側肉抜部15において、左右仕切壁15aと前後仕切壁15cとは略同一な厚さ(例えば2mm程度の厚さ)に形成されて、上下壁部15bの厚さ(例えば3mm程度)よりも薄く形成されている。
上下壁部15bは、サポートバー1の首部1e及び連結部2のフランジ部2dの上下表面を形成する横壁であり、前記したウイング部10gから左右方向に連続して形成されている。
前後仕切壁15cは、前後方向に背中合わせの状態で形成された端部側肉抜部15を前後に区画する縦壁であり、平面視してサポートバー1の中心線に沿って形成されている。
図1に示すように、連結部2,2は、サスペンション部材を連結する部位であり、サポートバー1の両端部にそれぞれ形成されている。連結部2は、サポートバー1の両端部に一体形成された略容器形状のハウジング部2aと、ハウジング部2a内に形成された凹状部2bと、凹状部2bの内底に形成された取付孔2cと、ハウジング部2aの外周部に形成されたフランジ部2dと、を有している。例えば、右側の連結部2は、左側の連結部2に対して対称な形状に形成されている。
凹状部2bは、円柱形状の窪みから成り、サポートバー1が延設されている方向に対して直交する方向に形成されている。
取付孔2cは、ボールシート3の下端面に突出形成されたリベット状の熱加締部3aが挿入されて取り付けられる貫通孔であり、複数形成されている。
フランジ部2dは、ハウジング部2aの外周部に形成された略厚板状の補強部位であり、平面視して略Cリング状に形成されている。フランジ部2dは、ハウジング部2aの外周部に形成されていることにより、連結部2の強度を保っている。フランジ部2dには、端部側肉抜部15(図5(d)参照)が前後方向に開口した状態に形成されている。
ボールシート3は、スタッドボルト4のボール部4aを回動自在に軸支するビボット軸受を形成する軸受部材である。ボールシート3は、リベット形状の複数の熱加締部3aと、潤滑油を溜めるための油溜部3bと、ボール部4aの形状に合わせて形成された球面部3cと、凹状部2bの開口縁部に配置される鍔部3dと、を有している。
スタッドボルト4は、連結部2に回動自在に配置される軸部と、連結用ボルトの機能を果たす金属製ボルトである。このスタッドボルト4は、基端側に形成されてボールジョイントを形成するボール部4aと、ダストブーツ5の先端側開口部5aが嵌合されるブーツ係合溝4bと、不図示のサスペンション部材の雌ねじ部が螺着される雄ねじ部4cと、を有している。なお、雄ねじ部4cの基端部には、連結したサスペンション部材が緩むのを防止する回り止め突起(図示省略)が形成されている。
ダストブーツ5は、ボール部4aの上部外周部位を覆うゴム製ブーツであり、上下左右方向へ収縮自在にボールシート3とスタッドボルト4とに設けられている。ダストブーツ5は、先端側に形成された先端側開口部5aと、基端側に形成された基端側開口部5bと、先端側開口部5aと基端側開口部5bとの間に形成された変形可能なカバー部5cと、を有している。ダストブーツ5内には、ボール部4aを潤滑させるためのボールジョイント用のグリスが注入されている。
次に、各図を参照して、本発明の実施形態に係るサスペンション用アーム部材Sの作用を説明する。
このため、サスペンション用アーム部材Sは、サポートバー1の前面及び後面に、上下方向及び長手方向に互い違いに肉抜部10を配置しているので、肉抜きした分だけサポートバー1を形成する樹脂材料を削減してコストダウンと軽量化を図ることができる。
また、サポートバー1は、多数形成された肉抜部10及び端部側肉抜部15が、上下及び左右方向に中心線を中心として対称に配置されていることにより、外力が負荷させた場合、その外力をサポートバー1全体でバランスよく吸収させることができる。
また、側壁10cは、隣接する肉抜部10に対して逆方向に拡開して形成されていることにより、開口端側のウイング部10gが倒れるのをトラス効果によって抑制するように樹脂成形することができると共に、軸回り方向の強度の均等化を図ることができる。
また、図3(b)に示すように、各肉抜部10の各角部10dは、それぞれ所定の曲率半径(アールRa,Rb、球アール面Rc)で丸められていることによって、自動車走行中に角部10dに他の部材等が衝突した際に、角部10dに応力が集中して破損するのを抑制することができる。
前記実施形態では、サスペンション用アーム部材Sの一例としてスタビライザリンクを例に挙げて説明したが、サスペンションに使用されるアーム形状のものであればよく、用途や設置箇所等は特に限定されない。
例えば、肉抜部10は、サポートバー1が大きい場合、その大きさに応じて、肉抜部10の左右方向の数を増やしたり、肉抜部10を上下方向に三段、四段、五段等に適宜増設したりしても構わない。
1a 前面上部
1b 前面下部
1c 後面上部
1d 後面下部
2 連結部
10 肉抜部
10a 開口部
10b 内底部
10c 側壁
10d 角部
10e 中間板部
10f リブ部
10g ウイング部
11 前側上部肉抜部
12 前側下部肉抜部
13 後側上部肉抜部
14 後側下部肉抜部
Ra,Rb アール
Rc 球アール面
S サスペンション用アーム部材
T1 中間板部の板厚
T2 リブ部の板厚
T3 ウイング部の板厚
θ 傾斜角度
Claims (9)
- 車両に搭載されるサスペンションの複数の部材を連結する連結部と、
当該連結部を両端部にそれぞれに設け長手方向に延設されたサポートバーと、を有するサスペンション用アーム部材であって、
前記サポートバーは、長手方向に直交する方向に向けて凹部状に形成された複数の肉抜部を有し、樹脂材料で形成され、
前記肉抜部は、前記サポートバーの前面上部に長手方向に形成された複数の前側上部肉抜部と、
前記サポートバーの前面下部に長手方向に形成され、前記前側上部肉抜部に対して上下方向に互い違いに配置された複数の前側下部肉抜部と、
前記サポートバーの後面上部に長手方向に形成され、前記前側上部肉抜部に対して前後方向に互い違いに配置された複数の後側上部肉抜部と、
前記サポートバーの後面下部に長手方向に形成され、前記後側上部肉抜部及び前記前側下部肉抜部に対して互い違いに配置された複数の後側下部肉抜部と、
を備えているサスペンション用アーム部材。 - 前記サポートバーの前記肉抜部が形成されている部位は、短手方向に断面視して略S字状または略逆S字状に形成されている請求項1に記載のサスペンション用アーム部材。
- 前記肉抜部が形成されている部位は、短手方向に断面視して中央部に配置された中間板部と、
前記中間板部の両端部から当該中間板部に対して直交する方向で相互に反対方向に向けて形成されたリブ部と、
前記リブ部の先端部から当該リブ部に対して直交する方向に平行に形成されたウイング部と、を有し、
前記中間板部の板厚をT1、前記リブ部の板厚をT2、前記ウイング部の板厚をT3とすると、前記肉抜部は、
T1<T3<T2
になるように形成されている請求項1または請求項2に記載のサスペンション用アーム部材。 - 前記肉抜部は、当該肉抜部の開口部から内底部に向けて形成された側壁が、前記開口部に対して拡開する傾斜角度をつけて形成されている請求項1または請求項2に記載のサスペンション用アーム部材。
- 前記側壁は、隣接する肉抜部に対して逆方向に拡開して形成されている請求項4に記載のサスペンション用アーム部材。
- 前記傾斜角度は、前記サポートバーの長手方向の中心線に対して91度から100度の範囲内のいずれかの角度からなる請求項4または請求項5に記載のサスペンション用アーム部材。
- 前記肉抜部の各角部は、それぞれ所定の曲率半径で丸められている請求項1または請求項2に記載のサスペンション用アーム部材。
- 前記樹脂材料は、PA66、PA6、PPS、POMのいずれかを含むエンプラまたはスーパーエンプラからなる請求項1または請求項2に記載のサスペンション用アーム部材。
- 前記樹脂材料には、繊維強化材が添加されている請求項8に記載のサスペンション用アーム部材。
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