JPH1178453A - Vibration control suspension device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce mandays and cost by providing an arm member made of an aluminium alloy and having engaging parts of uneven shape at one end, casting bearing members made of an aluminium alloy and engagedly fixed to the engaging parts, along with the arm member, and mounting vibration isolating connection parts to the bearing members. SOLUTION: This vibration control suspension device ideally used for a suspension arm of an automobile has an arm member 1 made of an aluminium alloy and having engaging parts 11 of uneven shape at both ends, and bearing members 2, 2 made of an aluminium alloy and having mounting holes 22, 22 inside. The arm member 11 is formed of an aluminium alloy by extrusion molding, and the engaging parts 11 of uneven shape are formed at the time of extrusion molding. The bearing members 2 are formed by arranging the arm member 1 in a die-casting mold and integrally forming, and a hot solution flowing into the recessed parts and engaging holes of the engaging parts at the time of die casting is solidified to fix engaging connection parts 23 engagedly to the engaging parts 11 of the arm member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration suspension device suitably used, for example, as a suspension arm of an automobile or an engine torque rod.

[0002]

2. Description of the Related Art Conventionally, for example, a suspension mechanism mounted on an automobile uses a suspension arm which is connected to other connection arms in a vibration-proof manner. As shown in FIG. 9, this suspension arm has an arm portion 91 made of steel, and a cylindrical bearing portion 93 made of steel whose outer peripheral portions are joined to both ends of the arm portion 91 by welding.
And an anti-vibration bush 95 fitted and fixed to the inner hole of each bearing portion 93 by press fitting.

[0003] Each anti-vibration bush 95 is attached to the inner cylinder fitting 9.
6, an outer cylinder 97 disposed coaxially outside the inner cylinder 96, and a rubber elastic body 98 interposed between the inner cylinder 96 and the outer cylinder 97 to integrally connect the two. Consisting of
The outer cylinder fitting 97 is fitted and fixed to the inner hole of the bearing 93 by press fitting. This suspension arm is connected to the inner hole of the inner cylindrical fitting 96 of each vibration-isolating bush 95 by fixing a mounting shaft portion such as another connecting arm or a mounting member by bolting or the like, and is connected to a suspension pen mechanism. Used to be incorporated. As a result, the vibration generated between the suspension arm and the connecting arm or the like connected thereto is effectively absorbed by the elastic action of the rubber elastic body 98.

[0004]

By the way, the above-mentioned suspension arm is generally formed using steel because it can secure sufficient strength and is relatively inexpensive. There is a disadvantage that the product is heavy. Therefore, in order to reduce the weight, it has been studied to form the suspension arm from an aluminum alloy, and as a manufacturing method in this case, for example, extrusion molding or die casting can be considered.

However, when a suspension arm in which the arm portion and the two bearing portions are integrated is formed by extrusion molding or die casting, the distance between the pitches of the vibration-isolating bushes fitted and fixed to the both bearing portions is determined by molding conditions such as heat. The dimensional accuracy of the distance is unstable, and twisting and twisting are likely to occur. Therefore, there is a problem that cutting and polishing are required, which leads to an increase in man-hours and an increase in cost.

When the axes of the cylindrical bearing portions formed at both ends of the arm portion are not parallel, there is an extrusion direction in extrusion molding, and a die-drawing direction in die casting, so that the bearing is manufactured. It becomes impossible. The present invention has been devised in view of the above problems, and has as an object to solve the problem of providing an anti-vibration suspension device capable of achieving sufficient weight reduction while avoiding an increase in man-hours and costs.

[0007]

According to a first aspect of the present invention, there is provided an arm member made of an aluminum alloy having at least one end with a concave-convex engaging portion formed by extrusion. The present invention employs a means including an aluminum alloy bearing member formed by casting together with the member and fixedly engaged with the engaging portion, and a vibration-proof connecting member attached to the bearing member.

According to this means, since the bearing member can be formed with high accuracy with respect to the arm member, the precision of the pitch distance of the vibration-proof connecting members disposed at both ends of the arm member can be made high. Can be. Accordingly, it is not necessary to perform cutting or polishing for obtaining the accuracy, and it is possible to avoid an increase in man-hours and an increase in cost. Further, since the bearing members constituting a part of the vibration isolation suspension device can be formed so as to face any direction with respect to the engaging portions of the arm members, the bearing members are respectively provided at both ends of the arm members. It is possible to cope with the case where the axial direction of the vibration isolating bush is shifted.

Therefore, according to the present invention, since the aluminum alloy arm member formed by extrusion molding and the aluminum alloy bearing member formed by casting are combined, the number of steps and cost are reduced. It is possible to sufficiently reduce the weight while avoiding an increase in the weight. In the present invention, the concave-convex engaging portion of the arm member is provided at one end or both ends according to the number of bearing members engaged and fixed thereto. This engaging portion can be provided by forming a concave portion or a convex portion on the outer surface of the arm member with which the bearing member contacts, or by forming a hole into which the bearing member enters. In addition, if the concave part is made to expand the bottom part, and the convex part is made to expand the tip part,
The strength of engagement with the bearing member increases. This engaging portion can be easily formed when the arm member is formed by extrusion molding.

In the case where the engagement portion is provided only at one end of the arm member, a cylindrical bearing portion for mounting a vibration-proof connecting member such as a vibration-proof bush is provided on the arm member. It can be formed integrally with the other end. The material of the aluminum alloy constituting the arm member is not particularly limited, but from the viewpoint of strength and corrosion resistance, for example, an Al-Mg-Si-based aluminum alloy such as JIS6061 or 6N01 is preferably used. Is done. As the extrusion molding method, a hot extrusion method is suitably adopted according to a general aluminum alloy molding method.

The material of the aluminum alloy constituting the bearing member is not particularly limited, but an aluminum alloy such as ADC-12 is preferably employed from the viewpoint of strength and corrosion resistance. As the casting method of the bearing member, a die casting method, a die forming method, or the like is preferably employed according to a general aluminum alloy casting method. The anti-vibration connecting member mounted on the bearing member can be appropriately selected and used, for example, an anti-vibration bush or a ball joint.

According to a second aspect of the present invention, in the first aspect of the present invention, the arm member has the engaging portion formed at one end and a cylinder integrally formed at the other end and to which a vibration-proof connecting member is attached. And a means having an annular bearing portion.
According to this means, when the arm member is formed by extrusion molding, the bearing portion made of an aluminum alloy to which the vibration isolating connecting member is attached can be formed simultaneously with the formation of the arm main body portion. Can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] FIG. 1 is a plan view of an anti-vibration suspension device according to the present embodiment, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a plan view partially showing a state in which a bearing member is integrally formed at both ends of the member, and FIG. 4 is a sectional view taken along line IV-IV of FIG. 3.

As shown in FIGS. 1 and 2, an anti-vibration suspension system according to the present embodiment is formed by an aluminum alloy arm member 1 having concave and convex engaging portions 11 at both ends, and die-casting together with the arm member 1. It is formed and fixed to each of the engaging portions 11 of the arm member 1, respectively, and has a mounting hole 22 therein.
Bearing members 2, 2 made of an aluminum alloy having
It comprises a vibration isolating bush 3 attached to the mounting hole 22 of one bearing member 2 and a ball joint 4 mounted to the mounting hole 22 of the other bearing member 2.

The arm member 1 is made of Al-based JIS6061.
It is formed by extrusion using a Mg-Si based aluminum alloy as a material. At both ends of the arm member 1, FIG.
As shown in FIG. 4, an uneven engaging portion 11 formed at the time of extrusion molding is provided. The engaging portion 11 includes a portion formed on the outer surface by alternately arranging concave portions 12 and convex portions 13 extending in the pushing direction, and an engaging hole 14 penetrating in the pushing direction. Arm member 1
At the center portion excluding both end portions, a hollow portion 15 penetrating in the extrusion direction is formed at the time of extrusion molding for weight reduction.

The bearing members 2, 2 have circular mounting holes 2 inside.
Cylindrical portions 21 and 21 having cylindrical portions 2 and 22;
1 are engaged with the engaging portion 11 of the arm member 1 and are fixedly engaged with the engaging portion 11 of the arm member 1. The bearing members 2 are formed by die-casting using an aluminum alloy of ADC-12. The bearing members 2 and 2 are formed by disposing the arm member 1 in a die casting mold and integrally forming the same. When the die casting is performed, the concave portions 12 of the engaging portions 11 of the arm member 1 are formed.
By solidifying the molten metal flowing into the engagement hole 14, the engagement connection portions 23 are fixedly engaged with the engagement portion 11 of the arm member 1 (see FIGS. 3 and 4).

As shown in FIGS. 1 and 2, the vibration-isolating bush 3 has a cylindrical inner cylindrical fitting 31 made of an aluminum alloy.
And a substantially cylindrical rubber elastic body 32 vulcanized and bonded to the outer peripheral surface of the inner cylindrical metal fitting 31, and a cylindrical intermediate metal fitting 33 coaxially embedded inside the rubber elastic body 32. .
The anti-vibration bush 3 is attached by being press-fitted into a mounting hole 22 of the bearing member 2.

The ball joint 4 has a bottomed cylindrical case 41, a substantially cylindrical resin holder 42 provided inside the case 41, and having a spherical surface on its inner periphery.
A spherical portion 43a is provided at the tip, and the spherical portion 43a
A joint shaft 43 inserted from the opening of the holder 42 and slidably held on the spherical surface of the holder 42, and both ends are fixed to the opening of the case 41 and the center of the outer periphery of the joint shaft 43 to cover the opening of the case 41. And a substantially cylindrical rubber cover 44. The ball joint 4 is attached by being inserted into the mounting hole 22 of the bearing member 2 and then reducing the diameter of the cylindrical portion 21 of the bearing member 2 by drawing.

In the anti-vibration suspension device of the present embodiment configured as described above, the mounting shaft of another connecting arm, mounting member, or the like is screwed into the inner hole of the inner cylindrical fitting 31 of the anti-vibration bush 3. In addition to being fitted and fixed, the joint shaft 43 of the ball joint 4 is connected to another connecting arm, a mounting member, or the like, so as to be vibration-isolated and used by being incorporated into a suspension pen mechanism or the like. As a result, the vibration generated between the vibration isolating suspension device and the connecting arm connected thereto is effectively absorbed by the elastic action of the rubber elastic body 32 of the vibration isolating bush 3 and the angular displacement of the ball joint 4. .

As described above, the anti-vibration suspension device of the present embodiment is formed by die-casting together with the arm member 1 at the engaging portions 11 at both ends of the aluminum alloy arm member 1 formed by extrusion. Since the bearing members 2 and 2 made of aluminum alloy are fixedly engaged, the accuracy of the pitch distance between the vibration-isolating bush 3 and the ball joint 4 mounted in the mounting holes 22 and 22 of both bearing members 2 and 2 is improved. Precision can be achieved. Therefore, unlike the case where the entire arm member 1 and the bearing members 2 and 2 are formed by extrusion molding or die casting, it is not necessary to perform a cutting process or a polishing process for obtaining accuracy. Therefore, according to the anti-vibration suspension device of the present embodiment, it is possible to achieve sufficient weight reduction while avoiding an increase in man-hours and costs.

The bearing members 2, 2 formed by die casting can be formed so as to face any direction with respect to the engaging portion 11 of the arm member 1.
Even if the axial directions of the vibration isolating bush 3 and the ball joint 4 mounted on the bearing members 2 and 2 are shifted,
By changing the direction in which the bearing members 2 are formed, it is possible to easily cope with the problem.

[Embodiment 2] FIG. 5 is a plan view of an anti-vibration suspension apparatus according to the present embodiment, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG. FIG. 8 is a plan view partially showing a state in which a bearing member is integrally formed with one end of the arm member in the device, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7.

As shown in FIGS. 5 and 6, the anti-vibration suspension device of the present embodiment has an uneven engaging portion 51 provided at one end.
And an aluminum alloy arm member 5 having a cylindrical bearing portion 55 provided at the other end, and an aluminum alloy bearing member 6 formed by casting together with the arm member 1 and engaged and fixed to the engaging portion 51. , A vibration isolating bush 7 attached to the bearing portion 55, and a ball joint 8 attached to the bearing member 6.

The arm member 5 is made of JIS6061 Al-
It is formed by extrusion using a Mg-Si based aluminum alloy as a material. As shown in FIGS. 7 and 8, one end of the arm member 5 is provided with a concave-convex engaging portion 51 formed at the time of extrusion molding, and the other end is provided with a tube formed at the time of extrusion molding. A bearing 55 is provided.

The engaging portion 51 has a concave portion 52 extending in the pushing direction.
And convex portions 53 are alternately arranged and formed on the outer surface portion and an engaging hole 54 penetrating in the pushing direction. The bearing portion 55 is formed integrally with the other end of the arm member 5 in a substantially cylindrical shape extending in the pushing direction, and has a circular mounting hole 56 therein. In the central portion of the arm member 5 excluding both end portions, similarly to the case of the first embodiment, a lightened portion 58 for reducing the weight is formed.

The bearing member 6 has a cylindrical portion 61 having a circular mounting hole 62 therein, and an engaging connection portion which protrudes from the outer peripheral portion of the cylindrical portion 61 and is fixedly engaged with the engaging portion 51 of the arm member 5. 6
3 This bearing member 6 is formed by die casting using an aluminum alloy of ADC-12 as in the first embodiment. The bearing member 6 is integrally formed with the arm member 5 so that the engagement connection portion 63 is engaged and fixed to the engagement portion 51 of the arm member 5 (see FIGS. 7 and 8).

As shown in FIGS. 5 and 6, the vibration isolating bush 7 is the same as that of the first embodiment, and has an aluminum alloy inner cylinder 71 and a vulcanized outer peripheral surface of the inner cylinder 71. And a substantially cylindrical rubber elastic body 72 bonded thereto. The anti-vibration bush 7 is attached to the mounting hole 5 of the bearing 55.
6 is press-fitted. Ball joint 8
Is the same as that of the first embodiment, and the housing 8
1, a holder 82, a joint shaft 83, and a rubber cover 84. This ball joint 8
Is inserted into the mounting hole 62 of the bearing member 6 and then attached by reducing the diameter of the cylindrical portion 61 of the bearing member 6 by drawing.

In the anti-vibration suspension apparatus of the present embodiment having the above-described configuration, the inner cylinder fitting 71 of the anti-vibration bush 7 and the joint shaft 83 of the ball joint 8 are the same as in the first embodiment. It is connected to a connecting arm, a mounting member or the like by vibration isolation, and is used by being incorporated into a suspension pen mechanism. As a result, vibrations generated between the suspension arm and the connecting arm connected thereto are effectively absorbed by the elastic action of the rubber elastic body 72 of the vibration isolating bush 7 and the angular displacement of the ball joint 8.

As described above, the anti-vibration suspension device of the present embodiment is formed by die-casting together with the arm member 5 at the engaging portion 51 at one end of the aluminum alloy arm member 5 formed by extrusion. Since the bearing member 6 made of an aluminum alloy is engaged and fixed, the precision of the distance between the pitches of the ball joint 8 and the vibration isolating bush 7 mounted on the bearing member 6 and the bearing portion 55 can be increased. Therefore, it is not necessary to perform a cutting process or a polishing process on the bearing portion 56 for obtaining accuracy, and it is possible to achieve a sufficient weight reduction while avoiding an increase in man-hours and costs.

Since the arm member 5 of the present embodiment has a bearing portion 55 integrally formed at the other end, when the arm member 5 is formed by extrusion molding, the aluminum alloy to which the vibration isolating bush 7 is attached is used. Can be formed simultaneously with the formation of the arm member 5, and the number of steps and cost can be further reduced. Further, also in the case of the vibration-isolating suspension device of the present embodiment, similarly to the case of the first embodiment, the vibration-isolating bush 7 attached to the bearing member 6 and the bearing portion 55.
Even if the axial direction of the ball joint 8 deviates from that of the ball joint 8, it is possible to easily cope with the case.

[Brief description of the drawings]

FIG. 1 is a plan view of an anti-vibration suspension device according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a plan view showing, in partial cross section, a state in which bearing members are integrally formed at both ends of an arm member in the vibration isolating suspension device according to the first embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a plan view of an anti-vibration suspension device according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a partial cross-sectional plan view showing a state in which a bearing member is integrally formed at one end of an arm member in the vibration-isolating suspension device according to Embodiment 2 of the present invention.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a plan view showing a cross section of a part of a conventional vibration-isolating suspension device.

[Explanation of symbols]

1, 5 ... arm member 2, 6 ... bearing member 3,
7: anti-vibration bush 4, 8: ball joint 11, 51: engaging portion 12, 52: concave portion 13, 53: convex portion 14,
54: engagement hole 15, 58: lightening portion 21, 61: cylindrical portion 2
2, 56: mounting hole 23: engagement connecting portion 31, 71: inner cylindrical fitting 32, 72: rubber elastic body 55: bearing portion 4
1, 81 ... Case 42, 82 ... Holder 43, 83 ... Joint shaft 44, 84 ... Rubber cover

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Ogawa Komaki City, Aichi Prefecture, 3600 Gezu, Kita-gaiyama Tokai Rubber Industries Co., Ltd. (72) Inventor Sadao Kokubo 6,224 Kaiyamacho, Sakai-shi, Osaka Showa Inside Aluminum Co., Ltd. (72) Inventor Masatoshi Enomoto 6,224, Kaiyama-cho, Sakai City, Osaka Prefecture Inside Showa Aluminum Co., Ltd. (72) Inventor Shunta 6,224, Kaiyama-cho, Sakai City, Osaka Showa Aluminum Co., Ltd. Inside

Claims (2)

[Claims] 1. An aluminum alloy arm member formed by extrusion having at least one end with a concave-convex engaging portion, and an aluminum member formed by casting with the arm member and fixedly engaged with the engaging portion. An anti-vibration suspension device comprising: a bearing member made of an alloy; and an anti-vibration connection member attached to the bearing member. 2. The arm member includes the engaging portion formed at one end and a cylindrical bearing portion integrally formed at the other end and to which a vibration-proof connecting member is mounted. 1
The anti-vibration suspension according to the above.