JP3591202B2 - Manufacturing method of intermediate cylinder fitting for liquid filled type vibration damping device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of manufacturing an intermediate cylindrical metal fitting for a liquid-sealed type vibration damping device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, a liquid filled type vibration damping device used as a strut mount in a suspension mechanism of a vehicle has been known. As shown in FIGS. 6 and 7, this liquid-filled type vibration damping device includes a main shaft 81 and a pair of coaxially arranged coaxially outside the main shaft 81 and spaced apart in the axial direction. An intermediate tubular metal fitting 82 having four ring portions 82a and four bridge portions 82c which are bridged between the two ring portions 82a to form four window portions 82b arranged in the circumferential direction together with the two ring portions 82a; The metal fitting 82 and the main shaft metal fitting 81 are connected to each other, and a rubber elastic body 83 having a concave portion 83a opened radially outward in a portion corresponding to the window portion 82b, and a concave portion 83a of the rubber elastic body 83 are liquid-tightly covered. And an outer cylinder 84 forming a main liquid chamber 86 and a sub liquid chamber 87 communicating with the rubber elastic body 83 via an orifice passage 85.
[0003]
This liquid-filled type vibration damping device is attached to a suspension mechanism such that the axial direction of the device is vertical. The vibration generated in the left-right direction and the front-back direction of the vehicle, which is perpendicular to the axis of the liquid-filled type vibration damping device, is caused by the elastic action of the rubber elastic body 83 and the volume change of the main liquid chamber 86 and the sub liquid chamber 87. Accordingly, the liquid flowing through the orifice passage 85 is effectively attenuated by the liquid column resonance action.
[0004]
[Problems to be solved by the invention]
By the way, in the liquid filled type vibration damping device, the tuning is performed while balancing the rigidity in the left-right direction and the rigidity in the front-rear direction in accordance with the vibration frequency to be reduced. Therefore, as means for increasing the rigidity, in the liquid filled type vibration damping device shown in FIGS. 6 and 7, a stopper 88 is attached to the main shaft metal member 81 or a pair of opposed bridge portions 82c of the intermediate cylindrical metal member 82 are moved in the axial direction. A stopper function is provided by a stepped portion 82d formed by reducing the diameter.
[0005]
However, when the diameter of the pair of opposed bridging portions 82c of the intermediate cylindrical metal member 82 is reduced by drawing or the like, a difference in length occurs between the pair of bridging portions 82c that are not reduced in diameter, and thus the two bridging portions 82c on both sides are reduced. The distortion occurs in the ring portion 82a. Therefore, there is naturally a limit to greatly reducing the diameter of only the pair of bridge portions 82c.
The present invention has been devised in view of the above situation, and provides a method of manufacturing an intermediate cylinder fitting for a liquid-filled type vibration damping device capable of forming a step having a large diameter reduction amount at a bridge portion of the intermediate cylinder fitting. Is to be solved.
[0006]
[Means for Solving the Problems]
The invention according to claim 1, which solves the above-mentioned problem, comprises a pair of ring portions arranged coaxially at an interval in the axial direction, and a bridge arranged between the ring portions and arranged circumferentially together with the ring portions. A pair of bridge portions having a stepped portion formed in the center thereof and having a diameter reduced in the axial direction at the center thereof, and at least one of the ring portions toward the other at a position between the bridge portions. A method of manufacturing an intermediate cylindrical metal fitting for a liquid-filled type vibration damping device, comprising: an extending portion that extends; a first step of forming the window portion at a predetermined position of a cylindrical metal pipe material; A second step of cutting the connecting portion of a predetermined portion connecting both ends of the metal pipe material by separating the portion and removing the portion having a predetermined length in the axial direction to form the extending portion; Reduce the diameter of the connecting part of the remaining part connecting the metal pipe material by separating the window part. It employs the means of carrying out a third step of forming the bridge portion by forming the step portion with.
[0007]
According to a second aspect of the present invention, in the first aspect of the present invention, after the third step is completed, a fourth step of connecting the distal ends of the extended portions to each other or the distal end of the extended portion to the other ring portion. Is implemented.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present embodiment is a method of manufacturing the intermediate cylinder fitting for a liquid-filled type vibration damping device shown in FIG. This intermediate cylindrical fitting is provided with a pair of ring portions 1 and 2 coaxially arranged at an interval in the axial direction, and is bridged between both ring portions 1 and 2 and arranged in the circumferential direction together with both ring portions 1 and 2. A pair of bridges 4 and 5 having stepped portions 4a and 5a whose diameters are reduced in the axial direction at the center of the four windows 3 formed at the positions between the two bridges 4 and 5. It consists of two sets of extending parts 6 and 7 which extend from both ring parts 1 and 2 to face each other.
[0009]
In manufacturing the intermediate cylindrical fitting, a cylindrical metal pipe member W having a predetermined size as shown in FIG. 2 is prepared.
Then, in the first step, punching is performed at a predetermined position of the metal pipe material W to form four windows 3 arranged in the circumferential direction as shown in FIG.
In the next second step, the window 3 is separated and the center of two of the four connecting parts connecting the two ring parts 1 and 2 at the axially symmetric position is cut. , A portion having a predetermined length in the axial direction is removed. As a result, as shown in FIG. 4, two sets of extending portions 6 and 7 extending opposite to each other from both ring portions 1 and 2 are formed. The predetermined length of the portion to be removed by the cutting process is a predetermined distance between the tips of the opposing extending portions 6 and 7 when the step portions 4a and 5a are formed in the next third step. Is set to the length at which is formed.
[0010]
Then, in the third step, the two connecting portions located at the remaining axially symmetric positions are subjected to diameter reduction processing to form step portions 4a, 5a. At this time, the ring portions 1 and 2 on both sides and the opposing extension portions 6 and 7 move so as to approach each other as the diameter of the connecting portion decreases, but the tips of the opposing extension portions 6 and 7 abut each other. Since they are not in contact with each other, step portions 4a and 5a having a large diameter reduction amount are formed. As a result, the bridging portions 4 and 5 having the step portions 4a and 5a whose diameters are greatly reduced in the center portion are formed, and the intermediate cylindrical fitting as shown in FIG. 1 is completed.
[0011]
As described above, according to the method of manufacturing the intermediate tubular metal fitting of the present embodiment, in the second step, the connecting portion of the predetermined portion is cut to remove the portion having the predetermined length in the axial direction, and the extension portion 6 is formed. , 7 are formed, the step portions 4a, 5a having a large diameter reduction amount can be formed when the step portions 4a, 5a of the bridge portions 4, 5 are formed in the third step.
[0012]
In the present embodiment, the extending portions 6 and 7 having the same length are provided so as to extend from both the ring portions 1 and 2, but the length of the extending portions 6 and 7 is equal to the second length. In the process, various changes can be made by appropriately selecting the position of the portion to be removed by cutting. For example, the extension portions 6 and 7 may extend from only one of the ring portions 1 and 2.
[0013]
The intermediate cylindrical member manufactured in the above embodiment is configured such that a predetermined interval is formed between the tips of the opposing extending portions 6 and 7, but the axial direction of the intermediate cylindrical member is different from that of the intermediate cylindrical member. If greater rigidity is required, after the third step is completed, a fourth step of joining the tips of the extension portions 6 and 7 by welding or the like is performed, and as shown in FIG. The protrusions 16 and 17 can be bridged between the ring portions 11 and 12. In this case, when forming the extension portions 16 and 17 in the second step, the length of the portion to be removed by cutting may be changed as appropriate.
[0014]
【The invention's effect】
According to the first aspect of the present invention, in the second step, the connecting portion of the predetermined portion connecting the both ends of the metal pipe material by separating the window portion is cut to form a portion having a predetermined length in the axial direction. Is removed to form the extended portion, so that when forming the step portion of the bridged portion in the third step, a step portion having a large diameter reduction amount can be formed.
[0015]
According to the second aspect of the present invention, after the third step is completed, the fourth step of connecting the distal ends of the extending portions to each other or the distal end of the extending portion to the other ring portion is carried out, so that the axial direction is reduced. It is possible to manufacture an intermediate cylinder fitting having greater rigidity.
[Brief description of the drawings]
FIG. 1 is a perspective view of an intermediate cylinder fitting for a liquid-filled type vibration damping device manufactured in an embodiment of the present invention.
FIG. 2 is a perspective view of a metal pipe material used in the embodiment of the present invention.
FIG. 3 is a perspective view of the metal pipe member after the first step in the embodiment of the present invention.
FIG. 4 is a perspective view of the metal pipe member after the second step in the embodiment of the present invention.
FIG. 5 is a perspective view of an intermediate cylinder fitting for a liquid-filled type vibration damping device manufactured in another embodiment of the present invention.
FIG. 6 is a cross-sectional view in a direction perpendicular to an axis of a liquid-filled type vibration damping device using a conventional intermediate cylinder fitting.
FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;
[Explanation of symbols]
1, 2, 11, 12 ... ring part 3 ... window part 4, 5 ... bridge part 4a, 5a ... step part 6, 7, 16, 17 ... extension part W ... metal pipe material

Claims (2)

A pair of ring portions coaxially arranged at an interval in the axial direction, and a window portion bridged between the ring portions and arranged in a circumferential direction together with the ring portions; A liquid-filling type comprising: a pair of bridging portions having a step portion whose diameter is reduced in the direction, and an extending portion extending from at least one of the two ring portions toward the other at a position between the two bridging portions. A method of manufacturing an intermediate cylinder fitting for a vibration isolator,
A first step of forming the window at a predetermined position of a cylindrical metal pipe material;
A second step of cutting the connecting portion of a predetermined portion connecting the both ends of the metal pipe material by separating the window portion and removing a portion having a predetermined length in the axial direction to form the extension portion; When,
Performing a third step of forming the cross-linking portion by forming the step by reducing the diameter of the connection portion of the remaining portion connecting the metal pipe material by separating the window portion. A method for producing an intermediate cylindrical metal fitting for a liquid-sealed type vibration damping device. The liquid filling type according to claim 1, wherein after the third step is completed, a fourth step of connecting the distal ends of the extended portions or the distal end of the extended portion to the other ring portion is performed. A method for manufacturing an intermediate cylinder fitting for a vibration isolator.

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