JP2544932Y2 - Mounting structure for automotive suspension members - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a suspension member such as a knuckle steering of an automobile.

[0002]

2. Description of the Related Art A suspension having a cushioning function between a body and an axle for absorbing various vibrations and shocks received from a road surface while a vehicle is running.
Is provided. FIG. 5 is a sectional view showing a general wheel, and a suspension is mounted on a knuckle steering 22 supported on the wheel via ball joints 20, 21 and the like. A wheel hub 24 is attached to the knuckle steering 22 via a wheel bearing 23, and a wheel 25 is fastened to the wheel hub 24 by a bolt 26. The shaft 29 of the constant velocity joint 28 is inserted into a through hole 27 formed in the center of the wheel hub 24, and the driving force transmitted from the drive shaft 30 is applied to the wheel hub 24 and the wheel 25.
Is transmitted to

As shown in FIG. 6, a conventional knuckle steering 22 and ball joints 20 and 21 are attached to a knuckle steering 22, which is made of ductile cast iron or the like. Is formed with a tapered hole 32 (33) which becomes a small diameter portion 37, while the outer periphery of the ball stud 38 is also formed in a tapered shape, the two 22 and 38 are fitted, and a nut 40 is formed on a male screw 39 formed at the tip of the ball stud. The ball stud 38 is fixed to the knuckle steering 22 by screwing.
Since a high hardness is required for the boss portion of the knuckle steering for such a structure, particularly for the fixed portion of the ball stud, the boss structure made of cast iron integrally formed with the knuckle steering as described above is adopted. Was common.

In a structure in which a reinforcing member such as a front member is attached to a vehicle body, as shown in FIG. 7, the bottom surface of an upper plate 41 of a front member and the bottom surface of a boss 42 are welded and provided on a lower plate 43. Boss end 42a
Is known, and the boss is fixed to the member by welding the side surface of the boss and the lower plate 43.

[0005]

However, in a structure in which the boss is fixed by welding, if high precision is required for the through hole of the boss, the through hole that is machined with high precision due to the heat effect at the time of welding is required. Since distortion occurs, it was necessary to perform machining after welding and joining the bosses. Particularly for bosses that are welded to the knuckle steering, the knuckle steering itself is large, so if it is rotated, vibrations and the like will occur due to imbalance in mass, so good cutting quality (dimensional accuracy, surface roughness, etc.) In order to obtain it, it is necessary to fix the knuckle steering side on the surface plate and rotate the cutting blade having the diameter of the inner diameter to perform cutting. As a result, a general-purpose lathe cannot be used, and therefore, an expensive large-scale dedicated machine is required. Further, since it is necessary to prepare a cutting blade for each dimension, it is extremely disadvantageous in terms of quality control and cost. .

[0006] Further, there is a risk that cracks may occur when a boss made of a high-strength material is welded and joined, and in that sense, only a material having a relatively low strength can be used.

[0007] The present invention has been made in view of such problems of the prior art, and improves the mounting accuracy of a suspension member for an automobile, and performs equipment processing by using a general-purpose lathe machine. The purpose is to reduce investment.

[0008]

In order to achieve the above object, the present invention provides a ball joint (51) having a tapered stud (50) whose diameter decreases toward the tip, and the tapered stud (50) is fitted. A suspension comprising a boss portion (53) having a tapered hole (52) formed therein and a nut (55) screwed with a male screw (54) provided at the tip of the tapered stud (50) to fix the ball joint (51). In the member mounting structure, the boss (5)
3) a substantially cylindrical boss (13, 17) in which the tapered hole (52) is formed, and a tapered small-diameter end surface (56) of the boss (13, 17) in close contact with the tapered stud (5).
The contact surface (58) in which a through hole (57) through which the male screw (54) of (0) penetrates and the outer surface (59) of the boss (13, 17) are press-fitted. ), And an arm member (4, 5) having the same.

At this time, the arm members (4, 5)
A first member (6) in which a surface (60) on which the outer periphery (59) of the boss (13, 17) is fitted is integrally formed of a plate-like material.
1) and a plate-shaped material having a through hole (57) formed in close contact with the tapered small-diameter end surface (56) of the boss (13, 17) and through which the male screw (54) of the tapered stud (50) penetrates. It may be a joint structure of the second member (62) formed of the third member and the third member formed of the arm body (4a).

[0010]

According to the present invention constructed as described above, the bosses (13) are provided on the fitting surfaces (60) provided on the arm members (4, 5).
By press-fitting 17), even if a relatively large external force acts in the axial direction of the boss, the boss does not come off. In addition, the lower surface of the boss (13, 17) is closely attached to the contact surface (58), so that the axis of the boss is mounted perpendicular to the contact surface (58). Then, a taper stud (50) is fitted into the taper hole (52) of the boss (13, 17),
It is fixed with a nut (55) via a contact surface (58). When tightening the nut (55), use a taper stud (5
Since the frictional force acts on the tapered portion of (0) and the tapered portion (52) of the boss, and the outer peripheral surface (59) of the boss and the fitting surface (60) of the arm member, the tapered stud (50) idles. It is concluded without. Therefore, the boss (13,1)
7) can be machined using a general-purpose lathe, and not only can good cutting quality (dimension accuracy, surface roughness, etc.) be obtained, but also large dedicated machines are not required, reducing capital investment. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a knuckle steering for an automobile according to an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged sectional view of a mounting portion of the boss, and FIG. 4 is an enlarged sectional view showing another embodiment of the present invention.

The knuckle steering according to this embodiment is
The cylindrical member 2 has a plurality of through-holes 7 having a plurality of inner diameters for press-fitting a wheel bearing or attaching a shaft or the like to an inner diameter portion of the cylindrical member 2. The specific mounting state of each component in this embodiment is as shown in FIG. That is, the wheel bearing 70 is inserted into the center of the through hole 7, and the wheel bearing 70 is fixed by the snap ring 71. A drive shaft 73 is fitted and fixed to the wheel hub 72 press-fitted on the inner ring side of the wheel bearing 70, and transmits the rotation of the drive shaft 73 to the wheel hub 72. Dust seals 74 and 75 are provided at both left and right ends of the through hole 7 to prevent water or the like from entering the wheel bearing 70 from outside. Further, a labyrinth seal 76 is press-fitted into the drive shaft 73, and the labyrinth seal 76 also prevents foreign matter from entering the wheel bearing 70. The present invention is not limited to this embodiment, and other types of through holes 7 may be used. This cylindrical member 2
Can be made of either a forged product or a steel pipe. However, the use of a steel pipe eliminates the need for casting and reduces the weight. As will be described later, machining of the through hole 7 is performed by machining after welding the structural member 3 to the cylindrical member 2.

A structural member 3 formed by press-forming a steel plate is joined to the outer periphery of the cylindrical member 2 by welding. As shown in FIG. 1, the structural member 3 is formed in a substantially disc shape by welding and joining two (middle) press-formed products 3a and 3b of steel plates. Such a structural member 3 is not limited to the shape shown in FIG. 1 and can be variously modified. However, after welding the structural member 3 to the cylindrical member 2, machining is performed on the through hole 7 of the cylindrical member 2. At the time of application, it is necessary that the cylindrical member 2 and the structural member 3 have such a shape that a balance can be maintained when the cylindrical member 2 and the structural member 3 are held by a lathe and rotated.

The structural member 3 of the present embodiment includes an arm member 4,
2, the upper arm 4 for attaching the suspension upper arm ("35" shown in FIG. 5) and the suspension lower arm ("34" shown in FIG. 5). It has a lower arm 5 for mounting and a knuckle arm 6 for mounting a tie rod (not shown) constituting the steering device. Each of the upper arm 4 and the lower arm 5 is formed by press-forming a steel plate, and a ball joint 51 is attached to the upper arm 35 or the lower arm 34 so that the knuckle steering can swing. In the case of this embodiment, ball joint sockets are mounted on the upper arm 35 and lower arm 34 sides, while the bosses 13 and 17 for fixing the ball studs 50 on the upper arm 4 and lower arm 5 sides.
Is installed. Further, the knuckle arm 6 is also shown in FIG.
As shown in (1), a steel plate is formed by press forming, and the tip of a tie rod (not shown) is bolted.

The mounting structure of the bosses 13, 17 is configured as shown in FIG. That is, the ball stud 50 according to the present embodiment is a stud having a tapered surface whose diameter decreases toward the tip.
The tapered hole 5 corresponding to the tapered stud 50 is also provided on the 7th side.
2 are drilled. The bosses 13 and 17 are formed in a substantially cylindrical shape, and a fitting surface 60 on which the outer peripheral surface 59 of the bosses 13 and 17 is fitted is press-formed in a burring shape on the upper arm 4 and the lower arm 5. Further, the upper arm 4 and the lower arm 5 are formed with a contact surface 58 that is in close contact with the tapered small-diameter end surfaces 56 of the bosses 13 and 17, and a male screw 5 formed at the tip of the tapered stud 50.
A through-hole 57 through which the hole 4 penetrates is formed. The upper arm 4 and the lower arm 5 are connected to a burring-shaped fitting surface 60.
Pressed product 4a with contact hole 58 and through hole 5
7 is formed by welding and joining the pressed product 4b on which the 7 is formed.

Next, the operation will be described. When manufacturing the knuckle steering according to the present embodiment, first, a cylindrical member 2 in which a through hole 7 for fixing a wheel bearing or the like is machined with appropriate accuracy is press-fitted into a structural member 3 formed by press forming. , 3 are welded. The welding position 14 in this case is, for example, as shown in FIG. Although thermal distortion may occur in the cylindrical member 2 due to the thermal effect of the welding of the cylindrical member 2 and the structural member 3, after the welding and joining, the two and the
Is fixed to a chuck of a lathe machine to machine the through hole 7 of the cylindrical member 2. At this time, in this embodiment, the arm members such as the upper arm 4, the lower arm 5, and the knuckle arm 6 are fixed to a lathe before assembling, and the center of gravity of the cylindrical member 2 and the structural member 3 is relatively high. In order for the chuck to grip and rotate with a uniform balance,
Machining can be performed using a conventional general-purpose lathe, and the problem of a reduction in processing accuracy due to imbalance is eliminated. After the mechanical processing, the arm members such as the upper arm 4, the lower arm 5, and the knuckle arm 6 formed by press forming are welded to the structural member 3, respectively ("15" indicates a welding position).

At this time, the thermal effect of welding between the arm members 4, 5, 6 and the structural member 3 stops only on the structural member 3, and there is no possibility that the mechanically processed cylindrical member 2 will be adversely affected. In addition, even if a relatively large external force acts in the axial direction of the boss by press-fitting the bosses 13 and 17 into the fitting surfaces 60 provided on the arm members 4 and 5, there is no possibility that the boss comes off. Further, the tapered small-diameter end surfaces 56 of the bosses 13 and 17 come into close contact with the contact surface 58, so that the shaft of the boss is mounted perpendicular to the contact surface 58. And boss 1
The taper studs 50 are fitted into the taper holes 52 of the third and the 17th, and are fixed by the nuts 55 through the contact surfaces 58. When the nut 55 is tightened, a frictional force acts on the tapered portion of the tapered stud 50 and the tapered portion 52 of the boss, and the outer peripheral surface 59 of the boss and the fitting surface 60 of the arm members 4 and 5. Fastened without slipping. Therefore, the bosses 13 and 17 can be machined using a general-purpose lathe, and not only can good cutting quality (such as dimensional accuracy and surface roughness) be obtained, but also large-sized dedicated machines are not required, and capital investment is reduced. Can be reduced.

The present invention is not limited to the embodiment described above, but can be variously modified. For example, as shown in FIG. 4, the arm members 4 and 5 are made of a first member 61 in which a fitting surface 60 on which the outer periphery 59 of the bosses 13 and 17 is fitted is integrally formed of a plate-like material. , 17 and a second member 62 made of a plate-like material having a through hole 57 formed through the male screw 54 of the tapered stud 50 and a pressed product 4a constituting an arm body. It is also possible to configure by welding the third member.

[0020]

As described above, according to the present invention, the boss portion has a substantially cylindrical boss formed with a tapered hole, and the boss portion is in close contact with the tapered small-diameter end surface of the boss and the male screw of the tapered stud penetrates. Since it is composed of a contact surface with a hole and a suspension member with a fitting surface on which the outer periphery of the boss is press-fitted, good cutting quality (such as dimensional accuracy and surface roughness) can be obtained using a general-purpose lathe. ) Can be obtained, and a large-scale dedicated machine is not required, so that capital investment can be reduced. In addition, the boss can be made of a high-strength material because the boss is not directly affected by heat by welding.

[Brief description of the drawings]

FIG. 1 is a front view showing a knuckle steering for an automobile according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged sectional view of a main part of the embodiment.

FIG. 4 is an enlarged sectional view showing a main part of another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a conventional knuckle steering.

FIG. 6 is a sectional view showing a conventional ball joint mounting structure.

FIG. 7 is a sectional view showing a conventional structure for attaching a reinforcing member to a vehicle body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wheel bearing 2 ... Cylindrical member 3 ... Structural member 4 ... Upper arm (arm member) 5 ... Lower arm (arm member) 6 ... Knuckle steering (arm member)

Claims (2)

(57) [Scope of request for utility model registration] 1. A ball joint (51) having a tapered stud (50) having a smaller diameter toward the tip, a boss (53) having a tapered hole (52) into which the tapered stud (50) fits, In the mounting structure of a suspension member including a nut (55) for screwing with a male screw (54) provided at the tip of the taper stud (50) and fixing the ball joint (51),
3) a substantially cylindrical boss (13, 17) having the tapered hole (52) formed thereon and a tapered small-diameter side end surface (56) of the boss (13, 17) in close contact with the tapered stud (5).
The contact surface (58) in which the through hole (57) through which the male screw (54) of (0) penetrates and the outer surface (59) of the boss (13, 17) are press-fitted. And an arm member (4, 5) having the following. 2. The arm member (4, 5) has a fitting surface (6) on which an outer periphery (59) of the boss (13, 17) is fitted.
0) is a first member (61) integrally formed of a plate-like material.
And the tapered small-diameter side end face of the boss (13, 17) (5
6) and closely contact the external thread (5) of the tapered stud (50).
4. A joint structure of a second member (62) made of a plate-like material having a through hole (57) formed therethrough and a third member made of an arm body (4a). Item 2. A mounting structure for an automobile suspension member according to Item 1.