JP3992097B2 - Strut type suspension system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a strut-type suspension device for a vehicle, and more particularly to an improvement in a structure for assembling a coil spring to a spring seat attached to a strut-type shock absorber.
[0002]
[Prior art]
In general, a strut type suspension device for a vehicle includes a strut type shock absorber having a spring seat on the outer periphery, a vehicle body side support attached to the tip of a piston rod, and a coil interposed between the spring seat and the vehicle side support. The strut type shock absorber is arranged on the wheel side of the vehicle, and the vehicle body side support is arranged on the vehicle body side to suspend the vehicle body.
[0003]
Further, in the above suspension system, in order to reduce the size of the spring seat and the vehicle side support, the coil spring interposed between them is a so-called pigtail type in which both end portions are gradually smaller in coil diameter than the central portion. May be used.
[0004]
By the way, in the vehicle strut type suspension device configured as described above, the coil spring may be broken for some reason during use.
[0005]
In this case, the lower side of the broken coil spring is seated on the spring seat, but the upper side of the coil spring is not fixed to the vehicle body side support, so that it is in a so-called free state.
[0006]
Therefore, the upper coil spring may drop downward or move laterally, which may damage the wheels, chassis, and the like.
[0007]
Therefore, in recent years, a holding means for the coil spring is provided on the lower surface of the vehicle body side support, and the upper end of the coil spring is always held by this holding means. Even if the coil spring breaks, the broken upper coil spring falls down. Have been developed that do not move or move sideways.
[0008]
[Problems to be solved by the invention]
However, when the above pigtail type coil spring is used, the following problems can be considered.
[0009]
That is, as shown in FIG. 5C, when an arbitrary part of the body portion of the coil spring 31 is broken, the gap between the lower end portion 32 of the coil spring 31 and the broken portion P indicated by a two-dot chain line. If the portion where the width H of the opening formed in the above (hereinafter referred to as the opening width H) is larger than the diameter h of the strut type shock absorber 33 indicated by a broken line becomes the broken portion P, the broken portion Even if the coil spring 34 below the portion P is seated on the spring seat, when a shock from the outside is applied, the coil spring 34 is connected to the strut type shock absorber 33 via the opening width H. Can easily escape to the side, causing damage to the wheels and chassis.
[0010]
That is, when the opening width H is smaller than the diameter h of the strut type shock absorber 33, the lower coil spring 34 is caught by the strut type shock absorber 33 even if the above-described impact or the like is applied to the coil spring 31. However, if the opening width H is larger than the diameter h, it will not be caught as described above and will easily be pulled out to the side.
[0011]
Accordingly, an object of the present invention is to provide a strut type suspension device in which the coil spring does not come out to the side of the strut type shock absorber regardless of where the coil spring breaks.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the strut type suspension door means of the present invention includes a strut type shock absorber, a spring seat attached to the outer periphery thereof, a vehicle body side support attached to the piston rod tip side, a spring seat and a vehicle body. In a strut type suspension device comprising a coil spring interposed between side supports and a first holding means provided on the vehicle body side support for holding the upper side of the coil spring, the spring seat is provided below the coil spring. One or a plurality of second holding means are provided corresponding to a position below the portion where the opening width between the distal end portion and the arbitrary trunk portion is larger than the diameter of the strut type shock absorber , A hook or sp with a U-shaped cross section formed by cutting up the horizontal seat surface of the spring seat. It is characterized by comprising a hook having a substantially U-shaped cross section fitted into an opening formed in the horizontal sheet surface portion of the ring sheet . Strut type suspension system.
[0014]
Further, in each of the above means, it is preferable that at least one second holding means is provided at the lower end of the coil spring.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a strut type suspension device A for a vehicle according to the present invention, and this suspension device A is mounted on a bracket 2 on a wheel side. A strut type shock absorber (hereinafter simply referred to as a shock absorber) 3, a spring seat 1 attached to the outer periphery of the shock absorber 3, and a spring seat provided at the tip of a piston rod 7 connected to the vehicle body 6 side. The vehicle-side support 5 includes a lower spring seat 1 and a coil spring 4 interposed between the support 5.
[0016]
The vehicle body side support 5 is formed by bending a plate body by press working, and a hook 8 serving as a first holding means for hooking the upper end portion of the coil spring 4 is also bent and formed on the outer edge side thereof. Yes.
[0017]
In this embodiment, only one hook 8 is shown, but a plurality of hooks may of course be provided.
[0018]
As shown in FIG. 1, the coil spring 4 includes an intermediate cylindrical portion 11 formed with the same coil diameter, an upper coil portion 12 whose diameter decreases from the cylindrical portion 11 upward, and a cylindrical shape. The lower coil portion 13 has a diameter that decreases from the portion 11 as it goes downward.
[0019]
Then, the upper end portion of the upper coil portion 12 is hooked on the hook 8, and the lower end portion of the lower coil portion 13 is seated on the spring seat 1, and the coil spring is broken by the second holding means of the present invention. The movement of itself at the time is restricted.
[0020]
More specifically, the spring seat 1 is provided with second holding means, and these second holding means are formed by cutting up the horizontal sheet surface portion of the spring seat, for example, as shown in FIG. A cut-and-raised portion 21 that is a U-shaped hook, or a hook that is formed by a clip 22 having a substantially U-shaped cross section fitted into an opening formed in the horizontal sheet surface portion of the spring seat 1 as shown in FIG. The coil spring 4 is held at this portion.
[0021]
As shown in FIG. 3, the cut-and-raised portion 21 has a diameter of the strut-type shock absorber 3 whose opening width between the front end portion of the coil spring and an arbitrary body portion, that is, the opening width H is indicated by a broken line. One or more (three are provided in the present embodiment) are provided so as to hold the coil spring 4 at an arbitrary position toward the lower end of the coil spring 4 from a portion equal to h. Thus, the coil spring on the lower side is prevented from coming out to the side of the shock absorber 3 when the coil spring is broken.
[0022]
In the figure, reference numeral 15 denotes a bump cushion 15 held by the vehicle-side support 5 on the upper outer periphery of the piston rod 7.
[0023]
Next, the operation of the present embodiment configured as described above will be described. Now, when the vehicle equipped with the vehicle strut type suspension device A according to the present embodiment is running, the coil spring 4 is moved for some reason. It is assumed that a large force that breaks is applied to the coil spring 4 and breaks at, for example, P1 indicated by a two-dot chain line in FIG.
[0024]
Then, the coil spring 4 breaks from this portion and is divided into an upper coil spring and a lower coil spring.
[0025]
At this time, since the upper end of the upper coil spring is hooked by the hook 8, it does not fall downward or move sideways.
[0026]
Further, since the opening width H of the lower coil spring is larger than the diameter h of the shock absorber 3, the conventional coil spring is easily pulled out to the side of the shock absorber 3. Since the lower coil spring is held by the spring seat 1, the coil spring 4 cannot be pulled out to the side of the shock absorber 3.
[0027]
Therefore, it is possible to reliably prevent damage to the wheels, chassis, and the like due to the coil spring 4 being pulled out to the side of the shock absorber.
[0028]
In the present embodiment, three cut and raised portions 21 are provided, but one may be used. In that case, if the formation site is the tip of the coil spring 4, the coil spring 4 can be prevented from slipping out to the side of the shock absorber 3 regardless of where the coil spring 4 breaks.
[0029]
Further, the second holding means of the present invention is not limited to the cut-and-raised part 21, but is made of a synthetic resin having a U-shaped cross section separate from the spring seat 1, as shown in FIG. The clip 22 may be used to hold the spring seat 1 and the coil spring 4 together.
[0030]
In this embodiment, a pigtail type coil spring is used. Of course, a coil spring having the same coil diameter or a different pitch may be used.
[0031]
【The invention's effect】
The present invention has the following effects.
[0032]
1) According to the first and second aspects of the invention, the coil spring below the broken portion is always held by the spring seat via the second holding means, regardless of where the coil spring breaks. This coil spring can be reliably prevented from coming out to the side of the strut type shock absorber.
[0033]
2) Similarly, since the second holding means can be easily formed in the manufacturing process of the spring seat, the increase in the number of parts and the processing cost can be suppressed.
[0034]
3) According to the invention of claim 2 , even if the coil spring breaks at any part, it can be held without fail, and the number of second holding means can be reduced.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view of a suspension device according to an embodiment of the present invention.
FIG. 2 is a partially broken front view showing a spring seat portion of FIG. 1;
FIG. 3 is a plan view showing a part of a lower coil portion of a coil spring.
FIG. 4 is a partially broken front view showing a spring seat portion, showing another example.
5A and 5B show a conventional coil spring, in which FIG. 5A is a partial plan view, FIG. 5B is a front view, and FIG. 5C is a partial bottom view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Spring seat 3 Strut type shock absorber 4 Coil spring 5 Car body side support 7 Piston rod 8 Hook (1st holding means)
21 Hook cut and raised portion (second holding means)
H opening width

Claims (2)

A strut type shock absorber, a spring seat attached to the outer periphery of the strut type shock absorber, a vehicle body side support attached to the front end of the piston rod, a coil spring interposed between the spring seat and the vehicle body side support, and a vehicle body side support. And a first holding means for holding the upper side of the coil spring, the opening width between the lower end portion of the coil spring and an arbitrary body portion of the spring seat has an opening width of the strut type shock absorber. One or a plurality of second holding means are provided corresponding to the position below the portion larger than the diameter , and the second holding means is formed by cutting the horizontal seat surface portion of the spring seat. Cross-sectional substantially U-shaped fitting in the opening formed in the horizontal sheet surface part of the U-shaped hook or spring seat Strut-type suspension apparatus characterized by being configured with a hook. The strut type suspension device according to claim 1 , wherein at least one second holding means is provided at a lower end portion of the coil spring .

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