JP2004278672A - Method for manufacturing single cylinder type shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a single cylinder type shock absorber in which a bracket or the like which is low in cost and can be welded with a cylinder. <P>SOLUTION: The single cylinder type shock absorber comprises a piston 8 movably inserted into the cylinder 1, and a rod 4 connected to the piston 8, where one or more members 3 to be connected are fixed around the cylinder 1 by welding. A enlarged diameter part 2 is provided at one or more parts of the cylinder 1, and the members 3 to be connected are welded on the outer circumference of the enlarged diameter part 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a method for manufacturing a single cylinder type shock absorber in which a bracket for mounting a sensor, a hose or a rolling diaphragm and a suspension spring receiver are fixed to a cylinder by welding.
[0002]
[Prior art]
In a so-called double-cylinder type shock absorber, this type of shock absorber is applied when a bracket or a suspension spring receiver (hereinafter referred to as a "bracket") for mounting a sensor, a brake hose, a rolling diaphragm, and the like is welded to the shock absorber. Although it depends on the mounting space of the vehicle, the bracket or the like may be generally welded directly to any part of the outer cylinder (for example, see Patent Document 1 and Non-Patent Document 1).
[0003]
On the other hand, in the case of a single-cylinder type shock absorber, when attaching the bracket or the like to the single-cylinder type shock absorber, the bracket or the like is welded to the cylinder because there is no outer cylinder unlike the double-cylinder type shock absorber. However, it is not possible to weld any part of the cylinder. This is because, in the case of a single-cylinder type shock absorber, since a bracket or the like is welded to the cylinder, welding distortion may occur in the cylinder or beads may be generated by welding in the cylinder in a fixing method by welding. This is because it hinders the smooth expansion and contraction movement of the user.
[0004]
Therefore, in a conventional single-cylinder type shock absorber in which a sensor, a brake hose, a rolling diaphragm and the like for mounting a sensor and a suspension diaphragm are fixed to a cylinder by welding, the bracket and the like are sealing members for sealing the lower end of the cylinder. And was fixed to the cylinder by welding. Welding a bracket or the like to the lower end of the cylinder is usually done by manufacturing the single-cylinder type shock absorber because the lower end of the cylinder is usually sealed with a sealing member and then welded. As described above, the cylinder is distorted, and the lower end of the cylinder is sealed with a sealing member before the piston is inserted, so that the piston cannot be inserted into the cylinder.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 63-125666 (full text, Fig. 5)
[Non-patent document 1]
Eleven Komamura, "Automobile Suspension", 1st edition, Sankaido Co., Ltd., March 1991, p112, Fig. 4-47
[0006]
[Problems to be solved by the invention]
In addition, depending on the specifications and standards of the vehicle, there are cases where it is desired to use a single-cylinder type shock absorber. However, due to restrictions on the mounting space of the vehicle, etc., the sealing member of the cylinder is inevitably sealed above the cylinder. In some cases, it is necessary to provide the bracket or the like near the opening end opposite to the opening end. However, if welding is performed near the open end of the cylinder as described above, the piston may not be able to be inserted into the cylinder when assembling the single-cylinder shock absorber.
[0007]
Therefore, in such a case, as shown in FIG. 6, first, the bracket 51 is made cylindrical, and the vertical length is made longer so as to be along the cylinder 50. To the cylinder 50 by welding.
[0008]
However, such a method increases the weight of the single-cylinder type shock absorber and increases the vertical length of the bracket, which increases the material cost of the bracket and the like, which is disadvantageous in terms of cost. .
[0009]
Further, since the bracket or the like is suitable for covering substantially the entire cylinder of the single-cylinder type shock absorber, an air layer is formed between the cylinder and the bracket or the like. This results in a so-called thermos structure, which makes it difficult for the heat generated by the single-cylinder type shock absorber to be released when the vehicle is traveling.Therefore, bubbles may be generated in the liquid in the shock absorber, which may hinder the function of the shock absorber. There is a risk that it is pointed out.
[0010]
Further, if the vertical length of the bracket or the like is too long, the bracket or the like is simply welded to the lower end of the cylinder. Therefore, when vibration is applied to the single-cylinder type shock absorber, the bracket and the like also vibrate, and the cylinder and the bracket, etc. It is pointed out that interference may cause abnormal noise.
[0011]
Therefore, the present invention has been made in order to improve the above-mentioned disadvantages, and an object of the present invention is to provide a method of manufacturing a single-cylinder type shock absorber capable of welding a low-cost bracket or the like to a cylinder. To provide.
[0012]
[Means for Solving the Problems]
A single-cylinder type shock absorber according to a first aspect of the present invention has a piston movably inserted into a cylinder and a rod connected to the piston, and one or a plurality of connected members are provided. In a method for manufacturing a single-cylinder type shock absorber fixed to a cylinder by welding, the connected member is welded after inserting a piston into the cylinder.
[0013]
As described above, beads and welding distortion occur in the cylinder due to welding, but since the piston is already inserted in the cylinder, there is no need to insert the piston into the cylinder after welding, and beads and welding distortion occur in the piston. There is no defect that hinders insertion. That is, the problem that the piston cannot be inserted into the cylinder when the piston is inserted after the bottom member is welded to the cylinder to seal the lower end of the cylinder is solved.
[0014]
Therefore, it is not necessary to insert the piston after cutting and removing the bead and the weld distortion portion, and the manufacture of the single cylinder type shock absorber becomes easy.
[0015]
Also, when inserting the piston into the cylinder, it is not affected by beads or welding distortion, and this also applies when inserting a member that seals the upper end of the cylinder, such as a rod guide or metal, into the cylinder. As a result, welding of the member to be welded to the vicinity of the upper end of the cylinder becomes possible.
[0016]
Then, as before, it is not necessary to lengthen the vertical length of the connected member and weld it to the lower end of the cylinder, so that the vertical length of the connected member can be shortened. Therefore, since it is possible to shorten the length of the connected member as compared with before, the material cost can be reduced correspondingly, the cost of the single cylinder type shock absorber can be improved, and the single cylinder type shock absorber can be improved. The mold shock absorber can be lighter than before.
[0017]
Further, since the connected member can be shortened, it does not cover substantially the entire cylinder of the single-cylinder shock absorber, and can release the heat generated by the single-cylinder shock absorber when the vehicle is running. Bubbles are formed in the liquid in the shock absorber, and the fear of impairing the function of the shock absorber is avoided.
[0018]
Further, the single-cylinder shock absorber according to the second aspect of the present invention is characterized in that, in the first aspect, a connected member is welded to an opening end of the cylinder or in the vicinity of the opening end.
[0019]
Therefore, since the welding position of the connected member is set at or near the opening end of the cylinder, a portion where the piston or free piston in the cylinder slides can be avoided, and the piston or free piston is generated by welding to the cylinder. Therefore, the function as a shock absorber can be maintained and exerted because it is not affected by bead or welding distortion.
[0020]
The single cylinder type shock absorber according to the third problem solving means of the present invention is the first or second problem solving device according to the first or second problem solving device, wherein the member to be connected is a sensor, a hose or both a bracket for mounting a rolling diaphragm and a suspension spring receiver or It is characterized by being either one.
[0021]
Therefore, in this case, since the bracket and the like can be shortened, it does not cover substantially the entire cylinder of the single-cylinder shock absorber, and can release the heat generated by the single-cylinder shock absorber when the vehicle is running. This makes it possible to avoid the possibility that bubbles are generated in the liquid in the shock absorber and hinder the function of the shock absorber. In particular, in the case of a single-cylinder shock absorber with an air spring, the cylinder is conventionally covered with a bracket or the like and the air chamber, so that the effect is particularly high.
[0022]
In the case where the connected member is a suspension spring receiver, the vertical length is only required to ensure the vertical length of the welded portion from the viewpoint of strength, so that the material cost can be significantly reduced.
[0023]
Furthermore, since the vertical length of the bracket and the like can be shortened, when vibration is applied to the single-cylinder type shock absorber, the bracket and the like also vibrate, thereby preventing the cylinder and the bracket from interfering with each other and generating abnormal noise. .
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, a single-cylinder shock absorber according to the method for manufacturing a single-cylinder shock absorber according to the present invention is connected to a cylinder 1, a piston 2 movably inserted into the cylinder 1, and the piston 2. Rod 5, a suspension spring receiver 3 as a connected member, a suspension spring 8 having a lower end supported by the suspension spring receiver 3, a rod guide 6, a cushion 7, and a damping force generated in a piston or a rod. An element (not shown), a free piston (not shown) for defining a gas chamber (not shown) in the cylinder 1 below the cylinder 1 in the figure, and a bottom for sealing the lower end of the cylinder 1 in the figure. And a member (not shown). The suspension spring 8 is interposed between the suspension spring receiver 3 and an upper suspension spring receiver (not shown) connected to the upper part of the rod 5 (not shown), and is formed in a so-called strut type. In the manufacturing method, as shown in FIG. 2, first, a piston 2 to which a rod 5 is connected is inserted into a cylinder 1. At this time, a free piston may be inserted in advance below the cylinder 1 in the drawing, and the bottom member may be welded to the lower end of the cylinder 1 in the drawing.
[0025]
Then, as shown in FIG. 3, the suspension spring receiver 3 is welded to the vicinity of the upper open end of the cylinder 1 in the drawing. Then, beads B and welding distortion are generated in the cylinder 1 by welding, but since the piston 2 is already inserted into the cylinder 1, as shown in FIGS. 4 and 5, the piston 2 is attached to the cylinder 1 after welding. There is no need to insert, and there is no problem that the bead B and the welding strain 10 hinder the insertion of the piston 2. In other words, the problem that the piston 2 cannot be inserted into the cylinder 1 when the piston 2 is inserted after the bottom member is welded to the cylinder 1 to seal the lower end of the cylinder 1 is solved. As a welding method, resistance welding such as spot welding or project welding may be used, but fusion welding may be used.
[0026]
Subsequently, the cushion 7 and the rod guide 6 are inserted from above the cylinder 1, the upper end of the cylinder 1 in FIG. 1 is caulked, and the rod guide 6 is fixed to form a single cylinder type shock absorber. As described above, a free piston is inserted into the cylinder 1 below the cylinder 1 in the drawing, and a bottom member is welded to the lower end of the cylinder 1 in the drawing, so that a damping force generating element and an upper suspension spring receiver (FIG. Are provided at predetermined positions as appropriate, and the cylinder 1 is filled with liquid except for the gas chamber.
[0027]
In addition, since the welding position needs to be divided into the rod side chamber and the piston side chamber by the piston 2 in the cylinder 1 and the gas chamber needs to be partitioned by the free piston in the cylinder 1, the piston of the cylinder 1 2 and the free piston may be out of the sliding range. Then, the piston 2 and the free piston do not need to be affected by beads or welding distortion generated by welding to the cylinder 1, so that the function as the shock absorber can be maintained and exhibited.
[0028]
However, the welding position is not limited to the position shown in FIG. 1, and may be welded to the vicinity of the lower end portion in FIG. 1. Is possible. It is also possible to provide a plurality of brackets or the like. For example, a suspension spring receiver as a connected member is welded to the vicinity of the upper end of the cylinder 1 as shown in a modified example described later, and the connected member is Brackets such as barrel sensors and hoses may be welded.
[0029]
As described above, after the piston 2 is inserted into the cylinder 1 and the suspension spring receiver 3 is welded, if processing is performed by the above-described manufacturing method, the bead B and the weld strain 10 are both removed by cutting. There is no need to insert the piston 2 from above, and the processing becomes easy.
[0030]
In addition, when the piston 2 is inserted into the cylinder 1, the piston 2 is not affected by the bead B and the welding strain 10. Similarly, the suspension spring receiver 3 can be welded to the vicinity of the upper end of the cylinder 1 in FIG. Although the case where the connected member is the suspension spring receiver has been described in FIG. 1, the connected member is the bracket 11 for attaching the sensor or the brake hose shown in FIG. 5, or the diaphragm of the air spring is used. It may be a bracket for attaching, or a bracket for attaching a member which will be provided outside the shock absorber to the shock absorber.
[0031]
Then, as before, it is not necessary to increase the vertical length of the suspension spring receiver or the bracket (bracket or the like) and weld it to the lower end of the cylinder, so that the vertical length of the bracket or the like can be reduced. Therefore, since it is possible to shorten the length of the bracket and the like, the material cost can be reduced correspondingly, the cost of the single cylinder type shock absorber can be improved, and the single cylinder type shock absorber can be improved. The shock absorber can be lighter than before. The vertical length of the bracket or the like may be selected to be shorter when the bracket or the like is welded below the cylinder and when it is welded above the cylinder.
[0032]
In addition, since the bracket and the like can be shortened, it does not cover substantially the entire cylinder of the single-cylinder shock absorber, and can release the heat generated by the single-cylinder shock absorber when the vehicle is running. The risk of bubbles forming in the liquid in the vessel and impairing the function of the shock absorber is avoided. In particular, in the case of a single-cylinder shock absorber with an air spring, the effect is particularly high because the cylinder is conventionally covered with the bracket and the air chamber.
[0033]
In addition, since the vertical length of the bracket etc. can be shortened, when vibration is applied to the single cylinder type shock absorber, the bracket etc. also vibrates, preventing the cylinder and the bracket etc. from interfering and generating abnormal noise. Is done.
[0034]
In the above description, the single-cylinder type shock absorber provided with the free piston in the cylinder has been described. It can be applied, and a similar effect can be obtained.
[0035]
【The invention's effect】
According to the invention of each claim, a bead or welding distortion is generated in the cylinder by welding, but since the piston is already inserted in the cylinder, it is not necessary to insert the piston into the cylinder after welding, and the bead or welding is not performed. There is no problem that the distortion hinders the insertion of the piston. That is, the problem that the piston cannot be inserted into the cylinder when the piston is inserted after the bottom member is welded to the cylinder to seal the lower end of the cylinder is solved.
[0036]
Therefore, it is not necessary to insert the piston after cutting and removing the bead and the weld distortion portion, and the manufacture of the single cylinder type shock absorber becomes easy.
[0037]
Also, when inserting the piston into the cylinder, it is not affected by beads or welding distortion, and this also applies when inserting a member that seals the upper end of the cylinder, such as a rod guide or metal, into the cylinder. As a result, welding of the member to be welded to the vicinity of the upper end of the cylinder becomes possible.
[0038]
Then, as before, it is not necessary to lengthen the vertical length of the connected member and weld it to the lower end of the cylinder, so that the vertical length of the connected member can be shortened. Therefore, since it is possible to shorten the length of the connected member as compared with before, the material cost can be reduced correspondingly, the cost of the single cylinder type shock absorber can be improved, and the single cylinder type shock absorber can be improved. The mold shock absorber can be lighter than before.
[0039]
Further, since the connected member can be shortened, it does not cover substantially the entire cylinder of the single-cylinder shock absorber, and can release the heat generated by the single-cylinder shock absorber when the vehicle is running. Bubbles are formed in the liquid in the shock absorber, and the fear of impairing the function of the shock absorber is avoided.
[0040]
According to the second aspect of the present invention, since the welding position of the connected member is set at the opening end of the cylinder or near the opening end, it is possible to avoid a portion in which the piston or the free piston slides in the cylinder. The free piston does not need to be affected by beads or welding distortion generated by welding to the cylinder, so that the function as a shock absorber can be maintained and exhibited.
[0041]
Further, according to the third aspect of the present invention, since the bracket and the like can be shortened, the cylinder does not cover substantially the entire cylinder of the single cylinder type shock absorber, and the heat generated by the single cylinder type shock absorber during traveling of the vehicle is reduced. It is possible to release the liquid, and it is possible to avoid a possibility that bubbles are generated in the liquid in the shock absorber and hinder the function of the shock absorber. In particular, in the case of a single-cylinder shock absorber with an air spring, the cylinder is conventionally covered with a bracket or the like and the air chamber, so that the effect is particularly high.
[0042]
In the case where the connected member is a suspension spring receiver, the vertical length is only required to ensure the vertical length of the welded portion from the viewpoint of strength, so that the material cost can be significantly reduced.
[0043]
Furthermore, since the vertical length of the bracket and the like can be shortened, when vibration is applied to the single-cylinder type shock absorber, the bracket and the like also vibrate, thereby preventing the cylinder and the bracket from interfering with each other and generating abnormal noise. .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a single cylinder type shock absorber manufactured by a method for manufacturing a single cylinder type shock absorber according to one embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the single-cylinder shock absorber in a state where a piston is inserted into a cylinder in the method of manufacturing a single-cylinder shock absorber according to the present invention.
FIG. 3 is a longitudinal sectional view of the single-cylinder shock absorber in a state where a suspension spring receiver is welded to a cylinder in the method for manufacturing a single-cylinder shock absorber according to the present invention.
FIG. 4 is a longitudinal sectional view of the single-cylinder shock absorber when a connected member is welded before inserting a piston into a cylinder.
FIG. 5 is a longitudinal sectional view of the single-cylinder shock absorber in a case where members to be connected are welded before a piston is inserted into a cylinder.
FIG. 6 is a longitudinal sectional view of a conventional single cylinder type shock absorber.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston 3 Suspension spring receiver which is a connected member 5 Rod 6 Rod guide 10 Welding distortion 11 Bracket B Bead

Claims (3)

In a method for manufacturing a single-cylinder shock absorber having a piston movably inserted into a cylinder and a rod connected to the piston, wherein one or more connected members are fixed to the cylinder by welding, A method for manufacturing a single-cylinder shock absorber, comprising inserting a piston into a cylinder and then welding the connected member. 2. The method for manufacturing a single-cylinder type shock absorber according to claim 1, wherein the connected member is welded to or near the opening end of the cylinder. The method for manufacturing a single-cylinder type shock absorber according to claim 1 or 2, wherein the connected member is at least one of a bracket for mounting a sensor, a hose or a rolling diaphragm, and / or a suspension spring receiver.

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