JP2004332746A - Single cylinder damper, and manufacturing method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To weld an inexpensive bracket or the like to a cylinder, and to insert a piston in a cylinder by the welding in a single cylinder damper and a manufacturing method for the same. <P>SOLUTION: The single cylinder damper has a piston 8 which is movably inserted in a cylinder 1 and a rod 4 connected to the piston 8, and one or a plurality of members 3 to be connected are fixed to an outer circumference of the cylinder 1 by welding. An expansion part 2 is provided on a part or a plurality of parts of the cylinder 1, and the members 3 are welded to the outer circumference of the expansion part 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to 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, and an improvement of the manufacturing method thereof.
[0002]
[Prior art]
In the so-called double cylinder type shock absorber, when the bracket for attaching the seed sensor, brake hose, rolling diaphragm, etc. and suspension spring receiver (hereinafter referred to as “bracket”) are fixed to the shock absorber by welding, the shock absorber is applied. Depending on the mounting space of the vehicle, generally, the bracket or the like may be directly welded to any part of the outer cylinder (see, for example, Patent Document 1 and Non-Patent Document 1).
[0003]
On the other hand, in the single cylinder type shock absorber, when the bracket or the like is attached to the single cylinder type shock absorber, since there is no outer cylinder unlike the double cylinder type shock absorber, the bracket or the like is welded to the cylinder. If it is a cylinder, it cannot be welded to any part. This is because, in a single cylinder type shock absorber, brackets and the like are welded to the cylinder, so the welding fixing method may cause welding distortion in the cylinder or bead welding in the cylinder. This is because the smooth expansion and contraction of the body is harmed.
[0004]
Therefore, in a conventional single cylinder type shock absorber in which a bracket or suspension spring receiver for attaching this type of sensor, brake hose, rolling diaphragm or the like is fixed to the cylinder by welding, the bracket or the like is a sealing member that seals the lower end of the cylinder It was fixed to the cylinder by being welded in the vicinity. Also, the bracket and the like are welded to the lower end of the cylinder. In the manufacture of a single cylinder type shock absorber, the lower end of the cylinder is usually sealed after being sealed with a sealing member. 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. This is also to avoid a situation in which the piston cannot be inserted into the cylinder.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 63-125666 (full text, Fig. 5)
[0006]
[Non-Patent Document 1]
Seiji Komamura and 11 others, “Suspension of automobiles”, 1st edition, Sankai-do Co., Ltd., March 1991, p112, Fig. 4-47
[0007]
[Problems to be solved by the invention]
In addition, depending on the vehicle specifications and standards, it may be desirable to use a single cylinder type shock absorber. However, due to restrictions on the mounting space of the vehicle, the cylinder sealing member must be sealed above the cylinder. In some cases, the bracket or the like must be provided near the open end opposite to the open end. However, if welding is performed in the vicinity of the opening end of the cylinder as described above, the piston may not be inserted into the cylinder when assembling the single cylinder type shock absorber.
[0008]
Therefore, in such a case, as shown in FIG. 4, first, the bracket or the like 51 is formed into a cylindrical shape, and further, the vertical length thereof is increased so as to be along the cylinder 50. Is to be connected to the cylinder 50 by welding.
[0009]
However, when such a method is taken, the weight of the single cylinder type shock absorber is increased, and the vertical length of the bracket is increased, so that the material cost of the bracket and the like is increased and the cost is disadvantageous. .
[0010]
Furthermore, since the bracket and the like cover almost the entire cylinder of the single cylinder type shock absorber, an air layer is formed between the cylinder and the bracket or the like, but the air layer generally has a thermal conductivity. Therefore, this results in a so-called thermos structure, and heat generated by the single cylinder type shock absorber is difficult to be released when the vehicle is running, so that bubbles are generated in the liquid in the shock absorber and there is a risk of hindering the function of the shock absorber. There is a risk that it is pointed out.
[0011]
Furthermore, if the vertical length of the bracket etc. is too long, the bracket etc. will only be welded to the lower end of the cylinder, so if vibration is applied to the single cylinder type shock absorber, the bracket etc. will vibrate and the cylinder and bracket etc. May be pointed out to cause abnormal noise due to interference.
[0012]
Therefore, the present invention was devised to improve the above-described problems, and the object of the present invention is to weld a single-cylinder shock absorber and a low-cost bracket or the like to the cylinder in the manufacturing method thereof. It is possible to insert the piston into the cylinder by the welding process.
[0013]
[Means for Solving the Problems]
The single cylinder type shock absorber in the first problem solving means 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 the single cylinder type shock absorber fixed to the outer periphery of the cylinder by welding, the enlarged member is provided in a part or a plurality of parts of the cylinder, and the connected member is welded to the outer periphery of the expanded part. .
[0014]
As described above, since the enlarged diameter portion is formed in the cylinder and the connected members are welded, a bead is generated on the inner peripheral side of the enlarged diameter portion of the cylinder, and the bead bulges toward the inner peripheral side. The tip of the bead can be positioned outside the inner diameter of the cylinder.
[0015]
That is, it is possible to insert a piston or a free piston into the cylinder without bothering or cutting the bead. In addition, even when welding distortion occurs in the cylinder, the welding distortion is generated only in the enlarged diameter portion in the same manner, so that the inner diameter of the cylinder is ensured, and no further machining into the cylinder is required. It becomes possible to insert a piston or a free piston.
[0016]
Therefore, the bead generated in the cylinder does not interfere with the insertion of the piston or the free piston. Therefore, the lower end of the cylinder may be sealed by welding the cap and the connected member may be welded to the enlarged diameter portion. Therefore, as compared with the case where the processing such as welding of the sealing member is performed after the piston is inserted into the cylinder, the rod and the piston do not interfere with the operation, so that the processing becomes easy.
[0017]
In addition, since the enlarged diameter part is provided, when inserting a free piston or piston into the cylinder, it is not affected by beads or welding distortion. Since the same applies to the insertion into the cylinder, the connected member can be welded to the vicinity of the upper end of the cylinder.
[0018]
Then, as before, since it is not necessary to lengthen the vertical length of the coupled member and weld it to the lower end of the cylinder, the vertical length of the coupled member can be shortened. Therefore, since it is possible to shorten the length of the member to be connected than before, the material cost can be reduced correspondingly, the cost of the single cylinder type shock absorber can be improved, and the single cylinder The type shock absorber can be made lighter than before.
[0019]
In addition, since the connected member can be shortened, it does not cover substantially the entire cylinder of the single cylinder type shock absorber, and it is possible to release the heat generated by the single cylinder type shock absorber when the vehicle travels. Air bubbles are generated in the liquid in the shock absorber, and the risk of disturbing the function of the shock absorber is avoided.
[0020]
Further, the single cylinder type shock absorber in the second problem solving means of the present invention is the first problem solving means. In the first problem solving means, the member to be connected is a bracket and / or a suspension spring receiver to which the sensor, hose or rolling diaphragm is attached. It is characterized by being.
[0021]
Therefore, in the single cylinder type shock absorber with an air spring, unlike the conventional case, it is possible to avoid covering the cylinder with the bracket and the air chamber, so that the heat dissipation of the single cylinder type shock absorber is particularly high.
[0022]
When the connected member is a suspension spring receiver, the material length can be remarkably reduced because it is only necessary to ensure the vertical length of the welded portion from the viewpoint of strength.
[0023]
Furthermore, since the vertical length of the bracket or the like can be shortened, when vibration is applied to the single-cylinder shock absorber, the bracket or the like is also vibrated and the cylinder and the bracket or the like are prevented from interfering with each other to generate noise. .
[0024]
And the single cylinder type | mold shock absorber in the 3rd problem-solving means of this invention is a 1st or 2nd problem-solving means, and an enlarged diameter part is provided in the opening end of a cylinder, or the opening end vicinity, It is characterized by the above-mentioned. .
[0025]
As described above, if the enlarged diameter portion is provided at the opening end of the cylinder or in the vicinity of the opening end, the enlarged diameter portion can be provided by avoiding the sliding portion of the piston or free piston in the cylinder. Since there is no large gap due to the enlarged diameter portion between the free piston and the cylinder, the function as a shock absorber can be maintained and exhibited.
[0026]
And the manufacturing method of the single cylinder type shock absorber in the fourth problem solving means has a piston movably inserted into the cylinder and a rod connected to the piston, and one or a plurality of connected parts In a method of manufacturing a single cylinder type shock absorber in which a member is fixed to a cylinder by welding, a diameter-enlarged portion is provided in a part or a plurality of portions of the cylinder, and then the connected member is welded to the enlarged-diameter portion. And
[0027]
According to the above manufacturing method, since the connected member is welded to the enlarged diameter portion after the enlarged diameter portion is provided in the cylinder, the same effect as the first problem solving means can be obtained.
[0028]
Furthermore, the manufacturing method of the single cylinder type shock absorber in the fifth problem solving means is the fourth problem solving means in which the connected member is either a bracket for mounting a sensor, a hose or a rolling diaphragm and / or a suspension spring receiver. It is characterized by being either.
[0029]
Therefore, according to the fifth problem solving means, since the connected member is the bracket or the like, it is possible to obtain the same effect as the second problem solving means.
[0030]
And the manufacturing method of the single cylinder type shock absorber in the sixth problem solving means is characterized in that, in the fourth or fifth problem solving means, the enlarged diameter portion is provided at or near the opening end of the cylinder.
[0031]
Accordingly, since the enlarged diameter portion is provided at the opening end of the cylinder or in the vicinity of the opening end, the enlarged diameter portion can be provided by avoiding the portion where the piston or free piston slides in the cylinder. A large gap due to the enlarged diameter portion is not formed between the cylinder and the function as a shock absorber can be maintained and exhibited.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the basic configuration of a single cylinder type shock absorber according to the present invention includes a cylinder 1, a piston 8 movably inserted into the cylinder 1, a rod 4 connected to the piston 8, and a rolling diaphragm. A bracket 3 which is a member to be connected to 6, a pneumatic piston 5 whose lower end is connected to the bracket 3, a rolling diaphragm 6 connected to the upper end of the pneumatic piston 5 by a ring R, and the rolling diaphragm 6. The dust cover 7, the chamber cylinder 20, and the mount 19 connected to the upper end of the chamber cylinder 20 and the upper end of the rod 4 are configured. That is, the single cylinder type shock absorber shown in FIG. 1 has a spring with an air chamber A formed by the bracket 3, pneumatic piston 5, rolling diaphragm 6, chamber cylinder 20 and mount 19 above the cylinder 1. This is a single cylinder type shock absorber.
[0033]
Hereinafter, the cylinder 1 will be described in detail. The lower end of the cylinder 1 is sealed with a cap 9 that is a sealing member to which the eye bracket E is coupled, and the enlarged diameter portion 2 is provided in the vicinity of the upper end. It is bulging. A free piston F is slidably inserted below the cylinder 1, and a gas chamber G is defined below the cylinder 1 by the free piston F and further inserted into the cylinder 1. The piston 8 separates the rod side chamber R1 and the piston side chamber R2. Further, although not shown, the piston 8 is provided with a plurality of ports penetrating the upper and lower surfaces thereof, and a disk-like leaf valve L in which a plurality of ports are stacked is closed, and a known damping force is provided. It forms the generating element. In addition to the leaf valve, other conventional means may be used as the damping force generating element.
[0034]
Further, a rod guide 15 fitted with a bearing 16 is press-fitted into the upper part of the cylinder 1, and an annular metal 17 having a seal is inserted above it, and the upper open end of the cylinder 1 is caulked. Thus, the metal 17 is sandwiched and fixed between the opening end of the cylinder 1 and the rod guide 15, and a cap C is fitted so as to cover the upper end of the cylinder 1. Thus, the cylinder 1 is sealed with the cap 9 at the lower end and the upper metal 17, and liquid is sealed in the rod side chamber R <b> 1 and the piston side chamber R <b> 2.
[0035]
The piston 8 is connected to the lower end of the rod 4 by a piston nut 22, and the upper end of the rod 4 is connected to the mount 19. A disc-shaped locking member 12 is attached to an intermediate portion of the rod 4, and a holder 10 a that holds the lower end of the rebound spring 11 is seated on the upper end of the locking member 12. A holder 10b holds the upper end of the rebound spring 11, and a cushion member 23 is provided on the upper end of the holder 10b.
[0036]
Therefore, even if the rod 4 moves upward in the figure relative to the cylinder 1, the cushion member 12 prevents the holder 10b and the rod guide 15 from interfering with each other. Further, when the rod 4 moves upward in the figure with respect to the cylinder 1, the rebound spring 11 is contracted gradually when the cushion member 12 comes into contact with the rod guide 15 so as to suppress the movement of the rod 4. Therefore, the impact at the time when the rod 4 is fully extended or at the time of the stroke in the extension direction can be buffered.
[0037]
Near the upper end of the rod 4, a substantially angel cake type mount 19 is coupled via a bush cover 21 which is a bottomed cylinder and has a hole (not shown) for inserting the rod 4 at the bottom. A stopper holding member 24 that holds the bump stopper 18 is coupled to the lower end of the bush cover 21. The bump stopper 18 prevents the cylinder 1 and the bush cover 21 from interfering with each other when the rod 4 moves downward in the figure with respect to the cylinder 1 and also cushions the impact when the rod 4 is in the contraction direction stroke. be able to.
[0038]
Although not shown, a vibration isolating rubber is inserted into the bush cover 21, and the vibration isolating rubber prevents vibration from the road surface when the single cylinder type shock absorber is applied to a vehicle. Relieve and improve the ride comfort of the vehicle. Further, the space between the rod 4 and the bush cover 21 is properly sealed, so that the gas in the air chamber A does not leak out of the air chamber A from this portion.
[0039]
And the upper end part of the substantially cylindrical chamber cylinder 20 in the figure is joined to the end part of the inner wall surface of the large diameter of the mount 19. Furthermore, the lower end of the chamber cylinder 20 is provided with two ribs (not shown) along the circumferential direction, and a dust cover 7 that covers the rolling diaphragm 6 is fitted to the outer periphery of the lower end of the chamber cylinder 20. The chamber cylinder 20 and the rolling diaphragm 6 are connected by holding one end of the rolling diaphragm 6 between the inner periphery of the lower end of the chamber cylinder 20 and the cylindrical locking member locking member 26. At this time, since the one end of the rolling diaphragm 6 is sandwiched between the rib formed on the lower end portion of the chamber cylinder 20 and the locking member 26 so that the gas in the air chamber A is crushed from this portion. There is no leakage outside.
[0040]
Although not shown, a valve capable of injecting and discharging gas into the air chamber A is provided on the side surface of the intermediate portion of the chamber cylinder 20 so that the pressure in the air chamber A can be adjusted. ing.
[0041]
Further, the other end of the rolling diaphragm 6 is clamped between the upper peripheral surface of the substantially bell-shaped pneumatic piston 5 in the drawing and the annular ring R and fixed to the pneumatic piston 5. Further, the lower end of the pneumatic piston 5 in the drawing is opened so that the bracket 3 can be inserted, and the vicinity of the lower end portion of the bracket 3 and the lower end of the pneumatic piston 5 are joined by welding or the like. The bracket 3 has a substantially cylindrical shape, and the upper and lower opening ends thereof are reduced in diameter, the lower end opening end side is brought into contact with the outer peripheral side surface of the cylinder 1, and the upper end opening end is expanded in diameter of the cylinder 1. It is welded to the outer periphery of the part 2. Then, since the air chamber A is partitioned from the outside by the cylinder 1, the bracket 3, the pneumatic piston 5, the rolling diaphragm 6, the chamber cylinder 20, the mount 19, the bush case 21, and the rod 4, the air chamber A is maintained in an airtight state. It can function as an air spring.
[0042]
Therefore, a single cylinder shock absorber with a so-called air spring is configured with the above-described configuration, and when the single cylinder shock absorber expands and contracts, the volume of the air chamber A also changes accordingly, and the inside of the air chamber A at that time It exhibits a spring constant corresponding to the pressure, and the natural frequency becomes substantially constant regardless of the change in load, so that the ride comfort is stabilized. If the air chamber A is connected to an auxiliary tank or the like via an orifice, the air spring itself can generate a damping force in addition to the damping force generated by the shock absorber, and the vehicle height can be easily adjusted. is there.
[0043]
Since the lower end opening end of the bracket 3 is reduced in diameter and is in contact with the cylinder 1, even if vibration is applied to the single cylinder type shock absorber, the upper end of the bracket 3 is welded to the cylinder 1. Since the lower end of the cylinder 1 is affirmed by the cylinder 1 in contact with the cylinder 1, it is possible to prevent the bracket 3 from rattling against the cylinder 1, so that the bracket 3 and the cylinder 1 interfere with each other as a result. It is possible to prevent the single cylinder type shock absorber from generating abnormal noise.
[0044]
Next, a manufacturing method of this single cylinder type shock absorber will be described. First, a part of the cylinder 1, that is, a position where the bracket 3 is attached is enlarged to form the enlarged diameter part 2. The method for expanding the diameter may be any method, but a diameter expanding tool or the like may be used. The bracket 3 is welded to the enlarged diameter portion 2. As a welding method, resistance welding such as spot welding or project welding may be used, but fusion welding may be used.
[0045]
The position where the enlarged diameter portion 2 is provided is that the cylinder 1 needs to be partitioned into the rod side chamber R1 and the piston side chamber R2 by the piston 8, and the inside of the cylinder 1 is separated from the working chamber and the gas chamber by the free piston F. Therefore, it is preferable to provide it outside the range in which the piston 8 and the free piston F of the cylinder 1 slide. If it does so, since the big clearance gap by the enlarged diameter part 2 will not be made between the piston 8 and the cylinder 1 or the free piston F and the cylinder 1, the function as a buffer can be exhibited and maintained. However, the position where the enlarged diameter portion 2 is provided is not limited to the position shown in FIG. 1 but may be provided in the vicinity of the lower end portion in FIG. 1 or may be other than the sliding portion of the piston 8 of the cylinder 1 or the free piston F. Can be provided. A plurality of enlarged diameter portions 2 can be provided. For example, the enlarged diameter portion 2 is provided in the vicinity of the upper end and the lower end of the cylinder 1, and the connected portion is connected to the vicinity of the upper end as shown in a modification described later. A suspension spring receiver as a member may be welded, and a bracket such as a sensor or a hose as a connected member may be welded near the lower end.
[0046]
As described above, since the enlarged diameter portion 2 is formed in the cylinder 1 and the bracket 3 is welded, the bead B is generated on the inner peripheral side of the enlarged diameter portion 2 of the cylinder 1 as shown in FIG. Even when the bead B bulges to the inner peripheral side, the tip of the bead B can be positioned outside the inner diameter dimension D of the cylinder 1. That is, if it processes by the said manufacturing method, it will become possible to insert the piston 8 or the free piston F which attached the rod 4 in the cylinder 1 without bothering cutting and removing the bead B. Further, even in a state where welding distortion occurs in the cylinder 1, since only welding distortion occurs only in the enlarged diameter portion 2, the inner diameter dimension D of the cylinder 1 is ensured, and no post-processing is performed on the cylinder 1. In addition, it is possible to insert the piston 8 or the free piston F with the rod 4 attached into the cylinder 1.
[0047]
Therefore, the bead B generated in the cylinder 1 does not interfere with the insertion of the piston 8 and the free piston F. Therefore, the lower end of the cylinder 1 in FIG. Since it may be welded to the portion 2, the rod 4 and the piston 8 are obstructive to work compared to the case where the cap 9 is welded after inserting the piston 8 with the rod 4 attached to the cylinder 1. Since it does not become, the process becomes easy.
[0048]
Further, since the enlarged diameter portion 2 is provided, the insertion of the free piston F or the piston 8 into the cylinder 1 is not affected by the bead B or welding distortion. This is the same when the member for sealing the upper end of the cylinder 1 is inserted into the cylinder 1, so that the bracket 3 can be welded to the vicinity of the upper end of the cylinder 1 in FIG.
[0049]
Then, as before, it is not necessary to lengthen the vertical length of the bracket and weld it to the lower end of the cylinder, so the vertical length of the bracket can be shortened. Therefore, since it is possible to shorten the length of the bracket than 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 buffer is also provided. The vessel can be made lighter than before. In addition, what is necessary is just to select the one where the vertical length of a bracket becomes short compared with the case where a bracket is welded below a cylinder, and the case where it welds upward.
[0050]
Further, since the bracket can be shortened, it does not cover substantially the entire cylinder of the single cylinder type shock absorber, and it is possible to release the heat generated by the single cylinder type shock absorber when the vehicle travels. Air bubbles are generated in the liquid inside, and the risk of disturbing the function of the shock absorber is avoided.
[0051]
In particular, in the single-cylinder shock absorber with an air spring as in the present embodiment, since the cylinder is conventionally covered with the bracket and the air chamber, the effect is particularly high.
[0052]
In addition, the vertical length of the bracket, etc. can be shortened, so that when the vibration is applied to the single cylinder type shock absorber, the bracket also vibrates and the cylinder and the bracket, etc. interfere with each other, thereby preventing noise. Is done.
[0053]
In the present embodiment, the bracket 3 has a cylindrical shape and its lower end is brought into contact with the cylinder 1. However, only the portion where the bracket is welded to the enlarged diameter portion 2 is a cylinder, and a disk is formed at the lower end of the cylinder. As a shape provided with a hook-like flange, the outer periphery of the tip of the flange may be coupled to the pneumatic piston 5. In this case, the bracket can be formed from a smaller material, which is economical and The heat dissipation of the mold buffer is also improved. Moreover, although the bracket 3 and the pneumatic piston 5 are separate members, they may be integrally formed.
[0054]
Next, a modification of the above embodiment will be described. Since the manufacturing method is the same, and the description of the same members as those of the above-described embodiment is repeated, the detailed description thereof is omitted.
[0055]
In this modified example, as shown in FIG. 3, a suspension spring receiver 31 that is a connected member is welded to the enlarged diameter portion 2 of the cylinder 1. Supports the lower end. Although not shown, the upper end of the suspension spring 30 is brought into contact with a spring receiver (not shown) provided at the upper end of the rod 4, and the vehicle body is supported by the suspension spring 30. Other configurations are the same as those of the above-described embodiment.
[0056]
The suspension spring receiver 31 includes a cylindrical weld 31a, a disc-shaped flange 31b extending from the weld 31a, and an upright portion 31c that rises vertically from the outer periphery of the flange 31b. Molded integrally.
[0057]
Accordingly, compared to the case where the suspension spring support is provided above the cylinder 1 of the single-tube shock absorber, the bracket of this modified example is compared with the case where the bracket had to be substantially the same length as the cylinder 1. In 31, except for the vertical length of the upright portion, the vertical length is only required to ensure the vertical length of the welded portion 31 a from the viewpoint of strength, so that the material cost can be significantly reduced.
[0058]
In this case as well, the bead B does not prevent the piston or free piston from being inserted into the cylinder 1, so that the assembly is good and the processing is easy, and it is the same as in the above-described embodiment. In addition, since it does not have a so-called thermos structure, the heat dissipation of the single cylinder type shock absorber is good.
[0059]
Further, in the illustrated example, the case where the connected member is a suspension spring receiver and the case where the connected member is a bracket for attaching a diaphragm of an air spring has been described, but the connected member may be a bracket for attaching a sensor or a brake hose, It is good also as a bracket for attaching the member which will be provided in the exterior of a container to a buffer.
[0060]
【The invention's effect】
According to the invention of each claim, since the enlarged diameter portion is formed in the cylinder and the connected members are welded, a bead is generated on the inner peripheral side of the enlarged diameter portion of the cylinder, and the bead bulges on the inner peripheral side. Even in this state, the tip of the bead can be positioned outside the inner diameter of the cylinder.
[0061]
That is, it is possible to insert a piston or a free piston into the cylinder without bothering or cutting the bead. In addition, even when welding distortion occurs in the cylinder, the welding distortion is generated only in the enlarged diameter portion in the same manner, so that the inner diameter of the cylinder is ensured, and no further machining into the cylinder is required. It becomes possible to insert a piston or a free piston.
[0062]
Therefore, the bead generated in the cylinder does not interfere with the insertion of the piston or the free piston. Therefore, the lower end of the cylinder may be sealed by welding the cap and the connected member may be welded to the enlarged diameter portion. Therefore, as compared with the case where the processing such as welding of the sealing member is performed after the piston is inserted into the cylinder, the rod and the piston do not interfere with the operation, so that the processing becomes easy.
[0063]
In addition, since the enlarged diameter part is provided, when inserting a free piston or piston into the cylinder, it is not affected by beads or welding distortion. Since the same applies to the insertion into the cylinder, the connected member can be welded to the vicinity of the upper end of the cylinder.
[0064]
Then, as before, since it is not necessary to lengthen the vertical length of the coupled member and weld it to the lower end of the cylinder, the vertical length of the coupled member can be shortened. Therefore, since it is possible to shorten the length of the member to be connected than before, the material cost can be reduced correspondingly, the cost of the single cylinder type shock absorber can be improved, and the single cylinder The type shock absorber can be made lighter than before.
[0065]
In addition, since the connected member can be shortened, it does not cover substantially the entire cylinder of the single cylinder type shock absorber, and it is possible to release the heat generated by the single cylinder type shock absorber when the vehicle travels. Air bubbles are generated in the liquid in the shock absorber, and the risk of disturbing the function of the shock absorber is avoided.
[0066]
According to the inventions of claims 2 and 5, in particular, in the single cylinder type shock absorber with an air spring, unlike the conventional case, it is possible to avoid covering the cylinder with the bracket and the air chamber. The heat dissipation is particularly high.
[0067]
When the connected member is a suspension spring receiver, the material length can be remarkably reduced because it is only necessary to ensure the vertical length of the welded portion from the viewpoint of strength.
[0068]
Furthermore, since the vertical length of the bracket or the like can be shortened, when vibration is applied to the single-cylinder shock absorber, the bracket or the like is also vibrated and the cylinder and the bracket or the like are prevented from interfering with each other to generate noise. .
[0069]
Specifically, as in the inventions of claims 3 and 6, if the enlarged diameter portion is provided in the opening end of the cylinder or in the vicinity of the opening end, a portion where the piston or free piston slides in the cylinder is avoided. Since the enlarged diameter portion can be provided and there is no large gap due to the enlarged diameter portion between the piston and the cylinder or the free piston and the cylinder, the function as a shock absorber can be maintained and exhibited.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a single cylinder type shock absorber according to an embodiment of the present invention.
FIG. 2 is an enlarged longitudinal sectional view of an enlarged diameter portion of a cylinder in an embodiment of the present invention.
FIG. 3 is an enlarged longitudinal sectional view of a single cylinder type shock absorber according to a modification of the present invention.
FIG. 4 is a longitudinal sectional view of a conventional single cylinder type shock absorber.
[Explanation of symbols]
1 cylinder
2 Expanded part
3 Bracket as connected member
4 Rod
6 Rolling diaphragm
8 Piston
9 Cap as a sealing member
31 Suspension spring receiver as connected member
B Bead
D Cylinder bore size

Claims (6)

A single cylinder type 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 outer periphery by welding. A single-tube shock absorber, wherein a part or a plurality of parts are provided with an enlarged diameter part, and the connected member is welded to the outer circumference of the enlarged diameter part. The single cylinder type shock absorber according to claim 1, wherein the member to be connected is a bracket for mounting a sensor, a hose or a rolling diaphragm, and / or a suspension spring receiver. The single cylinder type shock absorber according to claim 1 or 2, wherein the enlarged-diameter portion is provided at or near the opening end of the cylinder. In a manufacturing method of a single cylinder type shock absorber, which has a piston movably inserted into a cylinder and a rod connected to the piston, and one or a plurality of connected members are fixed to the cylinder by welding, A method of manufacturing a single cylinder type shock absorber, wherein a diameter-enlarged portion is provided in a part or a plurality of portions of a cylinder, and the connected member is welded to the diameter-enlarged portion. 5. The method of manufacturing a single cylinder type shock absorber according to claim 4, wherein the member to be connected is a bracket for mounting a sensor, a hose or a rolling diaphragm, and / or a suspension spring receiver. 6. The method of manufacturing a single cylinder type shock absorber according to claim 4, wherein the enlarged diameter portion is provided at or near the opening end.

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