JPH10184658A - Cylindrical bush type link - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with welding so as to reduce cost, and ensure sufficient rigidity. SOLUTION: A cylindrical bush type link 1 is provided with a link body 2 formed by cutting a ready made rectangular pipe member of approximately rectangular cross section into specified length. Both side faces 3a, 3b opposed to each other on the long-side side of the link body 2 are provided with circular burring holes 4 formed with the peripheral edge parts in the outward folded state. The burring holes 4 are provided at both longitudinal end parts of the link body 2, and cylindrical bushes 5 are fittingly fixed into the burring holes 4 by pressing-in.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical bush type link which is a component of a vehicle suspension, for example.

[0002]

2. Description of the Related Art Conventional cylindrical bush type links include:
For example, a short cylindrical member having an inside diameter capable of press-fitting a cylindrical bush is joined to both ends of a long pipe material by welding, respectively, to form a link body, and the cylindrical bush is fitted and fixed to the short cylindrical member by press-fitting. In addition, there is known a long link body formed by drawing a single plate, forming a burring hole at an end thereof, and fitting a cylindrical bush into the burring hole by press fitting.

[0003]

However, in the former cylindrical bush type link, since the link body is composed of a long pipe material and two short cylindrical members, the number of parts is increased, and moreover, the number of parts is increased. There is an inconvenience that the cost increases because the parts are joined by welding.

On the other hand, in the latter cylindrical bush type link,
Since the link body is composed of a single piece of drawn product, welding is unnecessary and it is inexpensive.However, since it is a drawn product, it is difficult to increase the section modulus and the direction orthogonal to the plate surface The bending stiffness of
Since the cross-sectional shape is asymmetric, there is a disadvantage that a bending action is generated with respect to a compression input in the longitudinal direction, and the tire input holding rigidity cannot be increased.

SUMMARY OF THE INVENTION The present invention has been made to solve such inconvenience, and it is an object of the present invention to provide a cylindrical bush type link capable of reducing costs by eliminating welding and ensuring sufficient rigidity. Aim.

[0006]

In order to achieve the above object, a cylindrical bush type link according to claim 1 has a cylindrical shape having a link body and cylindrical bushes provided at both ends of the link body. In the bush type link,
It is characterized in that a ready-made pipe material is used as the link body, a burring hole is formed in at least one end of the link body, and the cylindrical bush is fitted and fixed in the burring hole.

A cylindrical bush type link according to claim 2 is
The link body is a ready-made pipe material having a flat surface. The cylindrical bush type link according to claim 3, wherein at least one side surface of one of both side surfaces of the other end of the link body facing each other in the vertical direction and both sides facing each other in the width direction. A notch is formed in each of the other side surfaces, and a bolt insertion hole is formed on each of the other two side surfaces, and the cylindrical bush is disposed concentrically with the bolt insertion hole between the other two side surfaces, and the cylindrical bush is fastened with bolts and nuts. It is characterized by having done.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory perspective view for explaining a cylindrical bush type link according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is an explanatory sectional view for explaining a press-fitting method, and FIG. 4 is an explanatory sectional view for explaining another method for press-fitting a cylindrical bush into a burring hole.

As shown in FIGS. 1 and 2, this cylindrical bush type link 1 is formed by cutting a pre-made square pipe material having a substantially rectangular cross-section, in which both long sides and short sides are flat surfaces, to a predetermined length. A link body 2 is provided.

Circular burring holes 4 are formed on both long side surfaces 3a and 3b of the link body 2 which are opposed to each other in the vertical direction.
Are formed in a state where the peripheral portion is bent outward. The burring holes 4 are provided at both ends in the longitudinal direction of the link body 2, and the burring holes 4 formed in the upper side surface 3a and the burring holes 4 formed in the lower side surface 3b are arranged concentrically with each other. . A cylindrical bush 5 is fitted and fixed to the burring hole 4 by press fitting.

The cylindrical bush 5 has a rubber bush 8 interposed between the inner cylinder 6 and the outer cylinder 7, and the upper end and the lower end of the outer cylinder 7 have burring holes 4 formed on the upper side surface 3a.
And is fitted and fixed in the burring hole 4 on the lower side 3b side. As shown in FIG. 3, the cylindrical bush 5 may be fixed to the burring hole 4 by press-fitting the inner cylinder 6, the outer cylinder 7, and the rubber bush 8 into the burring hole 4, as shown in FIG. As shown in FIG. 4, the outer cylinder 7 may be press-fitted into the burring hole 4 in advance, and the rubber bush 8 and the inner cylinder 6 may be inserted into the press-fitted outer cylinder 7. . In the latter case, the outer cylinder 7 may be fixed to the burring hole 4 in advance by welding.

As described above, in this embodiment, since the ready-made square pipe material is used as the link main body 2, welding is not required, so that the manufacturing cost can be reduced, and the pipe material is used. Since the section modulus can be made larger than that of the conventional drawn product, the bending rigidity in the direction orthogonal to the axis can be sufficiently ensured.

Further, since a pipe member is used as the link body 2, the cross-sectional shape of the link body 2 can be made symmetrical. As a result, the link body 2 is bent by a longitudinal compression input as in the prior art. Can be prevented from occurring.

Further, since the heat is not affected by the welding, the quality is stable, and it is particularly suitable when the link body 2 is made of an aluminum pipe material which is severely softened.

Further, since the link body 2 is made of a pipe material having high rigidity, the link body 2 can be made thinner, so that the weight of the entire link can be reduced. Further, since a square pipe material having a flat surface is used as the link main body 2, it is not necessary to crush the round pipe to form the flat surface, and the link can be manufactured more easily.

FIGS. 5 to 9 show cylindrical bush type links according to second to fourth embodiments of the present invention. In each of the embodiments, the same parts as those in the first embodiment will be described with the same reference numerals.

First, a cylindrical bush type link 10 according to a second embodiment will be described with reference to FIG. 5. This cylindrical bush type link 10 is formed by cutting a pre-made square pipe material having a substantially square cross section to a predetermined length. And a link body 11 formed by cutting the link body.

A circular burring hole 4 is formed in one end of the link main body 11 on both side surfaces 12a and 12b opposed to each other in the up-down direction in a state in which the peripheral edge is bent outward. Circular burring holes 4 are also provided on both side surfaces 13a and 13b opposite to each other in the width direction at the other end.
Are formed in a state where the peripheral portion is bent outward. The burring hole 4 formed on the side surface 12a (13a) and the burring hole 4 formed on the side surface 12b (13b) are concentrically arranged. A cylindrical bush 5 is fitted and fixed to each of the burring holes 4 formed at one end and the other end of the link body 11 by press-fitting.

In this embodiment, it is possible to easily cope with a case where the axes of the cylindrical bushes 5 fitted and fixed to both ends of the link main body 11 are mutually shifted by 90 °. Note that the other configuration, operation, and effect are substantially the same as those of the first embodiment, and a description thereof will be omitted.

Next, a cylindrical bush type link 20 according to a third embodiment will be described with reference to FIGS. 6 and 7. This cylindrical bush type link 20 is made of a pre-made round pipe material having a circular cross section. Link body 21 cut to predetermined length
Is provided.

One end of the link body 21 is crushed in the vertical direction to form a flat portion 22, and circular burring holes 4 are formed on both side surfaces 23a and 23b of the flat portion 22 which oppose each other in the vertical direction. Is bent outward. The other end of the link main body 21 is at an arbitrary angle θ (45 ° in this case) in the circumferential direction with respect to the flat portion 22.
The flat portion 24 is squashed obliquely so as to be out of phase only, and circular burring holes 4 are formed on both side surfaces 25a and 25b of the flat portion 24 obliquely facing each other so that the burring holes 4 extend outward. It is formed in a bent state.
The burring hole 4 formed on the side surface 23a (25a) and the burring hole 4 formed on the side surface 23b (25b) are arranged concentrically with each other. Cylindrical bushes 5 are fitted and fixed to the burring holes 4 formed at one end and the other end of the link body 21 by press-fitting, respectively.

In this embodiment, it is possible to easily cope with a case where the axis of each cylindrical bush 5 fitted and fixed to one end and the other end of the link body 21 is shifted by an arbitrary angle θ. Note that the other configuration, operation, and effect are substantially the same as those of the first embodiment, and a description thereof will be omitted.

Next, a cylindrical bush-type link 30 according to a fourth embodiment will be described with reference to FIGS. 8 and 9. The cylindrical bush-type link 30 has flat long sides and short sides. A link main body 31 is formed by cutting a pre-made square pipe material having a substantially rectangular cross section as a surface into a predetermined length.

A cutout portion 32 is formed on one of two side surfaces (short side surfaces) of the link body 31 facing each other in the width direction. Further, both side surfaces 33a, 33b of one end of the link body 31 facing each other in the vertical direction.
Are vertically expanded so as to correspond to the axial dimension of the cylindrical bush 5. A bolt insertion hole 34 is formed in each of both side surfaces 33a and 33b,
2, the cylindrical bush 5 is inserted between the side surfaces 33a and 33b so that the axis of the cylindrical bush 5 and the axis of the bolt insertion hole 34 are concentrically arranged. To conclude.

On the other hand, circular burring holes 4 are formed on the opposite side surfaces 37a, 37b of the other end portion of the link body 31 in the vertical direction with the peripheral edge portion bent outward. The burring hole 4 formed in the upper surface 37a and the burring hole 4 formed in the lower surface 37b are arranged concentrically with each other, and the cylindrical bush 5 is fitted and fixed to the burring hole 4 by press fitting.

In this embodiment, it is possible to easily cope with a case where the cylindrical bush 5 disposed at one end of the link body 31 is of a sandwiching type. In addition, in this embodiment, the case where the notch 32 is provided only on one side of both sides facing each other in the width direction of the one end of the link main body 31 is taken as an example, but one side and the other side are provided. Notch portions 32 may be provided on both sides, and notch portions 32 may be provided on only one side surface of one end portion of link body 31 opposite to each other in the vertical direction or only one of the two side surfaces, and may be provided in the width direction. The bolt insertion holes 34 may be formed on both opposing side surfaces. When the notch 32 is provided on the vertical side surface of one end of the link main body 31 as described above, when the axes of the cylindrical bushes 5 provided at one end and the other end of the link main body 32 are shifted by 90 ° from each other. Can be easily handled. The other configuration, operation, and effect are substantially the same as those of the first embodiment, and a description thereof will be omitted.

[0027]

As is apparent from the above description, according to the first aspect of the present invention, since a pre-made pipe material is used for the link body, welding is not required and the production cost can be reduced. In addition, since the pipe material is used, the section modulus can be increased as compared with the conventional drawn product, so that the effect of sufficiently securing the bending rigidity in the direction orthogonal to the axis can be obtained.

Further, since the pipe body is used as the link body, the cross-sectional shape of the link body can be made symmetrical. As a result, unlike the related art, the link body does not bend due to the longitudinal compression input. The effect that it can be done is obtained.

Further, the quality is stable because it is not affected by heat due to welding, and it is particularly suitable for a case in which an aluminum pipe material which undergoes severe thermal softening is used as the link body. Further, since the link body is made of a pipe material having high rigidity, it is possible to reduce the thickness of the link body, thereby achieving an effect of reducing the weight of the entire link.

Further, by using a pipe material as the link body, it is possible to easily cope with the case where the axes of the cylindrical bushes provided at one end and the other end of the link body are shifted from each other by 90 ° or an arbitrary angle θ. Is obtained.

According to the second aspect of the present invention, in addition to the first aspect of the present invention, by using a ready-made pipe material having a flat surface as the link main body, it is possible to eliminate the trouble of crushing the round pipe to form a flat surface, thereby reducing the link. The effect that manufacturing can be made easier can be obtained.

According to the invention of claim 3, claim 1 or 2
In addition to the invention described in the above, an effect is obtained that it is possible to easily cope with a case where the cylindrical bush arranged at one end of the link body is a sandwich type.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view for explaining a cylindrical bush type link according to a first embodiment of the present invention.

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

FIG. 3 is an explanatory sectional view for explaining a method of press-fitting a cylindrical bush into a burring hole.

FIG. 4 is an explanatory sectional view for explaining another method for press-fitting a cylindrical bush into a burring hole.

FIG. 5 is an explanatory perspective view illustrating a cylindrical bush type link according to a second embodiment of the present invention.

FIG. 6 is an explanatory front view for explaining a cylindrical bush type link according to a third embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is an explanatory plan view for explaining a cylindrical bush type link according to a fourth embodiment of the present invention.

FIG. 9 is a front view of FIG. 8;

[Explanation of symbols]

 1, 10, 20, 30 ... cylindrical bush type link 2, 11, 21, 31 ... link body 4 ... burring hole 5 ... cylindrical bush 32 ... notch 34 ... bolt insertion hole 35 ... bolt 36 ... nut

Claims (3)

[Claims] 1. A cylindrical bush type link comprising a link main body and cylindrical bushes provided at both ends of the link main body, wherein a ready-made pipe material is used as the link main body, and at least one of the link main bodies is used. A burring hole is formed at an end of the cylindrical bush, and the cylindrical bush is fitted and fixed to the burring hole. 2. The cylindrical bush link according to claim 1, wherein the link body is a pre-made pipe material having a flat surface. 3. A notch is provided on at least one side of either one of both sides of the other end of the link body facing each other in the vertical direction and both sides facing each other in the width direction, A bolt insertion hole is formed on each of the other two side surfaces, and the cylindrical bush is disposed concentrically with the bolt insertion hole between the other two side surfaces, and the cylindrical bush is fastened with bolts and nuts. Claim 1
Or the cylindrical bush type link according to 2.