KR20230152881A - Hybrid control arm and method for fabricating the same - Google Patents

Abstract

A hybrid control arm and a manufacturing method thereof are disclosed. The disclosed hybrid control arm includes an arm body formed of a metal material; A ball joint coupled to one side of the arm body; a bush bracket made of plastic material and coupled to the other side of the arm body; and a bush coupled to the bush bracket.

Description

Hybrid control arm and method of manufacturing the same {HYBRID CONTROL ARM AND METHOD FOR FABRICATING THE SAME}

The present invention relates to a hybrid control arm that constitutes a vehicle suspension. It relates to a hybrid control arm that expands the parts that can be used for different types of vehicles and reduces the weight, and to a method of manufacturing the same.

A control arm is a member that constitutes a vehicle suspension system and is also called a suspension arm. The control arm includes an arm member approximately in the shape of an alphabet V, a ball joint coupled to one side of the arm member, and a bush coupled to the other side of the arm member. The ball joint on one side of the arm member is connected to a steering knuckle coupled to the wheel of the vehicle, and the bush on the other side of the arm member is connected to the vehicle body.

Conventional control arms have the problem of high cost and heavy weight because the entire arm member is made of metal material. In addition, when the vehicle model is different or the control arm is newly designed to suit a new vehicle model, there are no parts that can be shared among the existing arm members. Therefore, it is difficult to reduce the cost of the control arm.

The background technology of the present invention is disclosed in Korean Patent Publication No. 10-2018-0002150 (published on January 8, 2018, title of the invention: Upper arm for suspension device).

The present invention is intended to solve the above problems, and provides a hybrid control arm in which the bush bracket to which the bush is coupled is made of a plastic material, and a method of manufacturing the same.

The present invention includes an arm body formed of a metal material; A ball joint coupled to one side of the arm body; A bush bracket made of plastic material and coupled to the other side of the arm body; and a bush coupled to the bush bracket.

The bush bracket is detachably coupled to the arm body, the arm body has a male connection part protruding toward the bush bracket at the other end, and the bush bracket has a female connection part into which the male connection part is inserted. It can be provided.

The male connection portion includes a first protrusion protruding toward the bush bracket, and a second protrusion protruding from an outer surface of the first protrusion in a direction intersecting the protrusion direction of the first protrusion, and the female connection portion. may include a first protrusion insertion groove into which the first protrusion is inserted, and a second protrusion fitting hole into which the second protrusion is inserted.

The second protrusion fitting hole is formed in an outer wall defining an insertion groove that defines the first protrusion insertion groove, and the outer wall defining the insertion groove has the first protrusion from an end of the outer wall defining the insertion groove to the second protrusion fitting hole. A second protrusion guide slot may be formed that extends in a direction parallel to the protruding direction and has a width smaller than the inner diameter of the second protrusion fitting hole.

When the first protrusion is inserted into the first protrusion insertion groove, the second protrusion moves from the end of the outer wall defining the insertion groove along the second protrusion guide slot to the second protrusion fitting hole, and the second protrusion moves along the second protrusion guide slot. The guide slot may be elastically restored by the second protrusion until the second protrusion is inserted into the second protrusion fitting hole.

The arm body has a shape that is left and right symmetrical around the ball joint, and the bush bracket and the bush may each be provided as a pair.

The arm body may be formed of an aluminum alloy material.

The plastic material may include glass fiber.

A bush coupling aperture is formed in the bush bracket, and the bush includes a bush inner ring disposed inside the bush coupling aperture to be spaced apart from an inner peripheral surface of the bush coupling aperture, and an inner peripheral surface of the bush coupling aperture and the bush. A connecting rubber may be provided between the outer peripheral surface of the inner ring and joined to the inner peripheral surface of the bush coupling hole and the outer peripheral surface of the bush inner ring.

In addition, the present invention includes an arm body manufacturing step of manufacturing an arm body formed of a metal material; A bush bracket manufacturing step of manufacturing a bush bracket formed of a plastic material; A bush coupling step of coupling and fixing the bush to the bush bracket; A ball joint coupling step of coupling a ball joint to one side of the arm body; and a bush bracket coupling step of coupling the bush bracket to which the bush is coupled to the other side of the arm body.

A bush coupling aperture is formed in the bush bracket, and in the bush coupling step, the bush bracket and the bush inner ring are placed in a rubber curing mold so that the bush inner ring is disposed inside the bush coupling aperture and spaced apart from the inner peripheral surface of the bush coupling aperture. Bush bracket and bush inner ring mounting step; A rubber material input step of injecting the rubber material into the rubber curing mold so that the rubber material is interposed between the inner peripheral surface of the bush coupling hole and the outer peripheral surface of the bush inner ring; and a curing step of curing the rubber material to form a connecting rubber interposed between the inner peripheral surface of the bush coupling aperture and the outer peripheral surface of the bush inner ring and joined to the inner peripheral surface of the bush coupling aperture and the outer peripheral surface of the bush inner ring. there is.

The arm body manufacturing step may include a casting molding step of injecting molten metal into a casting mold and hardening it.

The bush bracket manufacturing step may include an injection molding step of injecting molten resin into an injection mold and curing it.

Glass fiber may be mixed with the molten resin.

The weight of the hybrid control arm of the present invention is reduced because the bush bracket that supports the bush is made of plastic material.

In addition, even if the shape of the control arm changes depending on the vehicle model or when a new vehicle model is developed, the cost of the control arm can be reduced by only changing the shape of the arm body and adopting a common bush bracket. The development period can also be shortened.

According to a preferred embodiment of the present invention, which includes a bush having a bush inner ring, a bush bracket, and a connection rubber joined to the bush inner ring, and a bush without a bush outer ring, the productivity of the control arm is improved, the cost is reduced, and the bush bracket Since the bush does not separate from the control arm, the quality and reliability of the control arm are improved.

Figure 1 is a perspective view of a hybrid control arm according to an embodiment of the present invention viewed from below.
Figures 2 and 3 are exploded perspective views of a hybrid control arm according to an embodiment of the present invention, where Figure 2 is a picture seen from above and Figure 3 is a picture seen from below.
Figure 4 is a block diagram showing a method of manufacturing a hybrid control arm according to an embodiment of the present invention.
Figures 5 to 7 are diagrams sequentially showing the bush coupling steps of Figure 4.

Hereinafter, a hybrid control arm and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the attached drawings. The terminology used in this specification is a term used to appropriately express preferred embodiments of the present invention, and may vary depending on the intention of the user or operator or the customs of the field to which the present invention belongs. Therefore, definitions of these terms should be made based on the content throughout this specification.

Figure 1 is a perspective view of a hybrid control arm according to an embodiment of the present invention from below, Figures 2 and 3 are exploded perspective views of a hybrid control arm according to an embodiment of the present invention, Figure 2 is a view from above, and Figures 3 is the picture seen below. Referring to FIGS. 1 to 3 together, the hybrid control arm 10 according to an embodiment of the present invention is an upper arm of the suspension and connects the body of the vehicle and the steering knuckle on the wheel side. Connect. The hybrid control arm 10 includes an arm body 11, a pair of bush brackets 20, a pair of bushes 31, and a ball joint. (40) is provided.

The arm body 11 is made of a metal material and is a member whose planar shape is approximately V-shaped, and a ball joint coupling hole 13 is formed on one side. The arm body 11 has a shape that is left and right symmetrical around the ball joint 40 coupled to the ball joint coupling hole 13. The arm body 11 includes a pair of arm leg portions 12 that are symmetrically disposed left and right about the ball joint 40. Preferably, the metal material of the arm body 11 may be an aluminum alloy material to reduce weight. The arm body 11 may be formed by casting molding in which molten metal is injected into a casting mold (not shown) and hardened.

On the other side of the arm body 11, that is, at the distal end of the pair of arm rack parts 12, a pair of bush brackets 20 are detachably coupled one by one. The arm body 11 is provided with a pair of male connecting portions 15 protruding toward the bush bracket 20 on the other side of the arm body 11, that is, at the distal ends of the pair of arm rack portions 12. Each male connecting portion 15 has a first protrusion 16 protruding toward the bush bracket 20 to have a rectangular cross-sectional shape, and a first protrusion 16 protruding from the outer surface of the first protrusion 16. It is provided with a plurality of second protrusions 17 protruding in a direction intersecting the direction, specifically in the upward and downward directions.

A pair of bush brackets 20 are made of plastic material, and each has a female connection part 24 into which the male connection part 15 is inserted, and an inner peripheral surface 22 to which the bush 31 is inseparably coupled (see Figure 5). Equipped with The inner peripheral surface 22 defines a bush coupling hole 21 (see FIG. 5) into which the bush 31 is inserted. The cross-sectional shape of the inner peripheral surface 22 is circular. The female connection portion 24 includes a first protrusion insertion groove 26 into which the first protrusion 16 is inserted, and a plurality of second protrusion fitting holes into which the plurality of second protrusions 17 are inserted ( 27) is provided.

The bush bracket 20 is provided with an insertion groove-defining outer wall 25 that defines a first protrusion insertion groove 26, and a plurality of second protrusion fitting holes 27 have an insertion groove-defining outer wall 25 in the thickness direction. It is formed in the outer wall 25 to penetrate the insertion groove. The female connection portion 24 further includes a plurality of second protrusion guide slots 28 formed on the outer wall 25 defining the insertion groove.

The second protrusion guide slot 28 extends in a direction parallel to the direction in which the first protrusion 16 protrudes from the end of the insertion groove-limiting outer wall 25 to the second protrusion fitting hole 27, and fits into the second protrusion. It has a width smaller than the size of the inner diameter of the hole 27. When the first protrusion 16 is inserted into the first protrusion insertion groove 26, the plurality of second protrusions 17 are formed at the end of the outer wall 25 defining the insertion groove along the plurality of second protrusion guide slots 28. It slides to the second protrusion fitting hole (27). Since the bush bracket 20 is formed of a plastic material, the plurality of second protrusion guide slots 28 have a plurality of second protrusions 17 until the plurality of second protrusions 17 are inserted into and seated in the plurality of second protrusion inserting holes 27. It is opened to enable elastic restoration by the second protrusion 17.

The male connection portion 15 and the female connection portion 24 are detachably coupled to each other by a plurality of fastening bolts 39. Specifically, a plurality of bolt fastening holes 19 are formed on the side of the first protrusion 16, and a plurality of bolt fastening holes 19 corresponding to the plurality of bolt fastening holes 19 are formed on the insertion groove-limiting outer wall 25. A bolt fastening hole 29 is formed. When the first protrusion 16 is inserted into the first protrusion insertion groove 26 and the plurality of second protrusions 27 are inserted into the plurality of second protrusion fitting holes 27, a plurality of bolt fastening holes 19 and The plurality of bolt fastening holes 29 are aligned one to one, and the plurality of fastening bolts 39 are inserted one by one into the aligned plurality of bolt fastening holes 29 and the plurality of bolt fastening holes 19 and tightened to form a pair. A bush bracket (20) is coupled to one side of the arm body (11).

Each bush bracket 20 is formed through injection molding in which molten resin of a plastic material is injected into an injection mold and hardened. The plastic material of the bush bracket 20 may be, for example, engineering plastic such as polyamide (PA). The plastic material of the bush bracket 20 may include glass fiber (GF) to reinforce rigidity.

A pair of bushes (31) are coupled one by one to a pair of bush brackets (20). Specifically, referring to FIGS. 5 to 7, the bush 31 is an integrated bush that is integrally joined to the inner peripheral surface 22 of the bush coupling hole 21, and includes a bush inner ring 32 and a connecting rubber. rubber) (35). The bush inner ring 32 is disposed inside the bush coupling aperture 21 and spaced apart from the inner peripheral surface 22 of the bush coupling aperture 21. The connection rubber 35 is interposed between the inner circumferential surface 22 of the bush coupling aperture 21 and the outer circumferential surface of the bush inner ring 32 and is joined to the inner circumferential surface 22 of the bush coupling aperture 21 and the outer circumferential surface of the bush inner ring 32. do.

Preferably, the shape and size of the pair of bush brackets 20 to which the pair of bushes 31 are integrally joined may be the same. In this case, the injection molding mold (not shown) for injection molding the bush bracket 20 on the left and the injection molding mold for injection molding the bush bracket 20 on the right can be used in common without having to manufacture them separately. . In addition, a rubber curing mold (not shown) for forming the bush 31 joined to the bush bracket 20 on the left and a rubber curing mold for forming the bush 31 joined to the bush bracket 20 on the right ( (not shown) can be used for public use without separate production. Accordingly, the manufacturing cost of the injection molding mold and the rubber curing mold is reduced, and the manufacturing cost of the control arm 10 can also be reduced.

Referring again to FIGS. 1 to 3, the ball joint 40 is coupled to the ball joint coupling hole 13 of the arm body 11. Specifically, the ball joint 40 includes a ball stud 41, a dust cover 50, a first fixing ring 53, and a second fixing ring 55. The ball stud 41 includes a circular ball portion 42 that is inseparably fitted into the ball joint coupling hole 13, and a stud portion that is connected to the ball portion 42 and protrudes to the outside of the arm body 11. (stud portion) 44 is provided. The ball portion 42 is not separated from the ball joint coupling hole 13, but can change its posture such as rotating or tilting.

The dust cover 50 is an annular member that prevents foreign substances such as dust, fine particles, and sludge from penetrating into the inside of the ball joint coupling hole 13 and the ball portion 42, and is elastically deformable. It is formed of a rubber material. The first fixing ring 53 has one end of the dust cover 50 in elastic contact with a rim (not shown) that defines the opening of the ball joint coupling hole 13 of the arm body 11. If possible, wrap and pressurize one end of the dust cover 50. The second fixing ring 55 surrounds and presses the other end of the dust cover 50 so that the other end of the dust cover 50 comes into elastic close contact with the outer peripheral surface of the stud portion 44. The stud portion 44 of the ball joint 40 is coupled to the steering knuckle (not shown), and the bush inner ring 32 of the pair of bushes 31 is coupled to the vehicle body (not shown).

Figure 4 is a block diagram showing a method of manufacturing a hybrid control arm according to an embodiment of the present invention, and Figures 5 to 7 are diagrams sequentially showing the bush coupling steps of Figure 4. Referring to FIGS. 1 to 4 together, the manufacturing method of the hybrid control arm 10 according to an embodiment of the present invention includes an arm body manufacturing step (S10), a bush bracket manufacturing step (S20), and a bush coupling step (S30). , a ball joint coupling step (S40), and a bush bracket coupling step (S50).

The arm body manufacturing step (S10) is a step of manufacturing the arm body 11 formed of a metal material. To elaborate, the arm body manufacturing step (S10) may include a casting molding step of injecting molten metal into a casting mold (not shown) and hardening it. The metal may be an aluminum alloy.

The bush bracket manufacturing step (S20) is a step of manufacturing a pair of bush brackets (20) made of plastic material. To elaborate, the bush bracket manufacturing step (S20) may include an injection molding step of injecting molten resin into an injection mold (not shown) and curing it. The molten resin may be mixed with glass fiber as a reinforcing material that strengthens the rigidity of the plastic used as the material for the bush bracket 20.

The bush coupling step (S30) is a step of coupling and fixing the bush 31 to each bush bracket 20. To elaborate, the bush coupling step (S30) includes a bush bracket and bush inner ring mounting step (S31), a rubber material input step (S32), a curing step (S33), and an extraction step (S34). Referring to Figures 5 and 6, in the bush bracket and bush inner ring mounting step (S31), the bush inner ring 32 is arranged inside the bush coupling aperture 21 to be spaced apart from the inner peripheral surface 22 of the bush coupling aperture 21. This is the step of mounting the bush bracket 20 and the bush inner ring 32 in a rubber curing mold (not shown).

The rubber curing mold has an upper mold and a lower mold that can be in close contact with and spaced apart from each other. The state in which the upper mold and the lower mold are spaced apart is a state in which the rubber curing mold is opened, and the state in which the upper mold and lower mold are in close contact with each other is a state in which the rubber curing mold is joined. When the rubber curing mold is opened, a seating surface on which the bush bracket 20 and the bush inner ring 32 are seated may be formed on one of the upper and lower molds. When the bush bracket 20 and the bush inner ring 32 are seated on the seating surface and the rubber curing mold is molded, the bush bracket 20 and the bush inner ring 32 are fixedly mounted while being inserted into the inside of the rubber curing mold.

The rubber material input step (S32) is a step of inputting the rubber material into the rubber curing mold so that the rubber material is sandwiched between the inner peripheral surface 22 of the bush coupling hole 21 and the outer peripheral surface of the bush inner ring 32. The rubber material may be a circular solid rubber material or a liquid rubber material. If the rubber material is a solid rubber material, with the rubber curing mold opened, insert a ring-shaped solid rubber material between the inner peripheral surface (22) of the bush bracket (20) and the outer peripheral surface of the bush inner ring (32) and mold the rubber curing mold. By doing so, the rubber material input step (S32) can be performed. If the rubber material is a liquid rubber material, the liquid rubber material is injected from the outside to the inside of the rubber vulcanization mold through a rubber material runner formed in the rubber vulcanization mold while the rubber vulcanization mold is molded, thereby performing a rubber material injection step (S32) ) can be performed.

Referring to Figure 7, the curing step (S33) is performed by curing the rubber material introduced inside the rubber curing mold, which is sandwiched between the inner peripheral surface 22 of the bush coupling aperture 21 and the outer circumferential surface of the bush inner ring 32 and the bush coupling aperture ( This is the step of forming the connection rubber 35 joined to the inner peripheral surface 22 of 21) and the outer peripheral surface of the bush inner ring 32. The curing step (S33) can be performed by heating the rubber curing mold so that the temperature of the rubber curing mold is the curing temperature of the rubber material and maintaining it for a certain period of time. The bush 31 formed through the curing step (S33) is provided with a bush inner ring 32 and a connection rubber 35 bonded to the outer peripheral surface of the bush inner ring 32 and the inner peripheral surface 22 of the bush coupling hole 21. It is formed integrally with the bush bracket (20).

The removal step (S34) is a step in which the rubber curing mold is opened and the bush bracket 20, in which the bush 31 is integrally formed, is taken out from the rubber curing mold. In a preferred embodiment of the present invention, the shape and size of a pair of bush brackets 20 in which the bushes 31 are integrally joined may be the same. In this case, the injection molding mold (not shown) for injection molding the bush bracket 20 on the left and the injection molding mold for injection molding the bush bracket 20 on the right can be used in common without having to manufacture them separately. . In addition, a rubber curing mold (not shown) to form the bush 31 joined to the bush bracket 20 on the left and a rubber curing mold to form the bush 31 joined to the bush bracket 20 on the right. It can be used for public use without having to separately manufacture a mold (not shown). Accordingly, the manufacturing cost of the injection molding mold and the rubber curing mold can be reduced, and the manufacturing cost of the hybrid control arm 10 can also be reduced.

Referring again to FIGS. 1 to 4, the ball joint coupling step (S40) is a step of coupling the ball joint 40 to the ball joint coupling hole 13 formed on one side of the arm body 11. To elaborate, the ball joint coupling step (S40) includes the ball stud coupling step (S41) of coupling the ball stud 41 to the ball joint coupling hole 13 without being separated, and the annular dust cover 50 being attached to the arm body ( 11) and a dust cover coupling step (S42). The ball stud 41 includes a circular ball portion 42 and a stud portion 44 connected to the ball portion 42. Specifically, in the ball stud coupling step (S41), the ball portion 42 is inserted into and coupled to the ball joint coupling hole 13. In the dust cover coupling step (S42), one end of the dust cover 50 is elastically adhered to a rim (not shown) defining the opening of the ball joint coupling hole 13 of the arm body 11. Preferably wrapping and pressing one end of the dust cover 50 with the first fixing ring 53, and attaching a second fixing ring so that the other end of the dust cover 50 is elastically adhered to the outer peripheral surface of the stud portion 44. A step of wrapping and pressing the other end of the dust cover 50 is provided at (55).

The bush bracket coupling step (S50) is a step of coupling a pair of bush brackets (20) in which the bushes (31) are coupled to a pair of male connectors (15) provided on the other side of the female body (11). Since the bush bracket coupling step (S50) has already been mentioned while explaining the male connection part 15 and the female connection part 24 with reference to FIGS. 1 to 3, redundant description will be omitted.

The weight of the hybrid control arm 10 described above is reduced because the bush bracket 20 supporting the bush 31 is made of a plastic material. In addition, even if the shape of the control arm (10) is changed in accordance with the case where the vehicle model is different or a new vehicle model is developed, only the shape of the arm body (11) is changed and the bush bracket (20) is adopted for common use. ) costs can be reduced, and the development period of the control arm 10 can also be shortened.

The bush 31 provided in the hybrid control arm 10 according to a preferred embodiment of the present invention includes only a bush inner ring 32, a bush bracket 20, and a connection rubber 35 joined to the bush inner ring 32. , bush paddle is not provided. Accordingly, the productivity of the hybrid control arm 10 is improved, the cost is reduced, and the bush 31 does not separate from the bush bracket 20, thereby improving the quality reliability of the hybrid control arm 10.

The present invention has been described with reference to an embodiment shown in the drawings, but this is merely illustrative, and those skilled in the art will recognize that various modifications and other equivalent embodiments are possible therefrom. You will understand. Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

10: Hybrid control arm 11: Arm body
15: male connection 20: bush bracket
21: Bush coupling hole 24: Female connection part
31: Bush 32: Bush inner ring
35: Connection rubber 40: Ball joint

Claims (14)

An arm body formed of a metal material;
A ball joint coupled to one side of the arm body;
A bush bracket made of plastic material and coupled to the other side of the arm body; and
A hybrid control arm comprising a bush coupled to the bush bracket.
According to claim 1,
The bush bracket is detachably coupled to the arm body,
The arm body has a male connection portion protruding toward the bush bracket at an end of the other side,
The bush bracket is a hybrid control arm, characterized in that it has a female connection part into which the male connection part is inserted.
According to clause 2,
The male connecting portion includes a first protrusion protruding toward the bush bracket, and a second protrusion protruding from an outer surface of the first protrusion in a direction intersecting the protruding direction of the first protrusion,
The female connection part is a hybrid control arm characterized in that it has a first protrusion insertion groove into which the first protrusion is inserted, and a second protrusion fitting hole into which the second protrusion is inserted.
According to clause 3,
The second protrusion fitting hole is formed on an outer wall defining an insertion groove that defines the first protrusion insertion groove,
The outer wall defining the insertion groove extends from the end of the outer wall defining the insertion groove to the second protrusion fitting hole in a direction parallel to the direction in which the first protrusion protrudes, and is larger than the inner diameter of the second protrusion fitting hole. A hybrid control arm characterized in that a second protrusion guide slot having a small width is formed.
According to clause 4,
When the first protrusion is inserted into the first protrusion insertion groove, the second protrusion moves along the second protrusion guide slot from the end of the outer wall defining the insertion groove to the second protrusion fitting hole,
A hybrid control arm, wherein the second protrusion guide slot is elastically restored by the second protrusion until the second protrusion is inserted into the second protrusion fitting hole.
According to claim 1,
The arm body has a shape that is left and right symmetrical around the ball joint,
A hybrid control arm, characterized in that the bush bracket and the bush are each provided as a pair.
According to claim 1,
A hybrid control arm, characterized in that the arm body is formed of an aluminum alloy material.
According to claim 1,
A hybrid control arm, wherein the plastic material includes glass fiber.
According to claim 1,
A bush coupling through hole is formed in the bush bracket,
The bush has a bush inner ring disposed inside the bush coupling aperture to be spaced apart from the inner peripheral surface of the bush coupling aperture, and is interposed between the inner circumferential surface of the bush coupling aperture and the outer peripheral surface of the bush inner ring and the bush coupling aperture. A hybrid control arm characterized by having a connecting rubber bonded to the inner peripheral surface of and the outer peripheral surface of the bush inner ring.
An arm body manufacturing step of manufacturing an arm body formed of a metal material;
A bush bracket manufacturing step of manufacturing a bush bracket formed of a plastic material;
A bush coupling step of coupling and fixing the bush to the bush bracket;
A ball joint coupling step of coupling a ball joint to one side of the arm body; and
A method of manufacturing a hybrid control arm, comprising: a bush bracket coupling step of coupling the bush bracket to which the bush is coupled to the other side of the arm body.
According to claim 10,
A bush coupling through hole is formed in the bush bracket,
The bush combining step is,
A bush bracket and bush inner ring mounting step of mounting the bush bracket and the bush inner ring on a rubber curing mold so that the bush inner ring is disposed inside the bush coupling aperture and spaced apart from an inner peripheral surface of the bush coupling aperture;
A rubber material input step of injecting the rubber material into the rubber curing mold so that the rubber material is interposed between the inner peripheral surface of the bush coupling hole and the outer peripheral surface of the bush inner ring; and
A curing step of curing the rubber material to form a connecting rubber sandwiched between the inner peripheral surface of the bush coupling aperture and the outer peripheral surface of the bush inner ring and joined to the inner peripheral surface of the bush coupling aperture and the outer peripheral surface of the bush inner ring. Hybrid control arm manufacturing method.
According to claim 10,
The arm body manufacturing step includes a casting molding step of injecting molten metal into a casting mold and hardening it.
According to claim 10,
The bush bracket manufacturing step includes an injection molding step of injecting molten resin into an injection mold and curing it.
According to claim 13,
A hybrid control arm manufacturing method, characterized in that glass fiber is mixed with the molten resin.

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