JPS6246930Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of vibration isolating rubber for a strut-type suspension system. Without giving large distortion to the swinging rubber,
It is an object of the present invention to provide a vibration isolating rubber for a strut-type suspension system that is capable of sufficiently alleviating shock, has excellent durability, and has excellent handling stability and moldability. It is something.

Known vibration isolating rubber for strut-type suspension systems include:
For example, there are those shown in FIGS. 1 and 2.

In the known example shown in FIG. 1, an upper annular fitting 1 and a lower annular fitting 2 are joined at flanges 1a and 2a with bolts 3 to constitute an outer cylindrical fitting A, and an outer cylindrical fitting A is formed through a through hole 4 of the lower annular fitting 2. The inner surface of the outer circumferential fitting A consists of an outer circumferential surface 6 including the stepped portion 5 of the inner cylindrical fitting B inserted into the cylindrical fitting A, an inner circumferential surface of the upper annular fitting 1 and an inner circumferential surface of the lower annular fitting 2. A vibration-proof rubber sleeve 7 is interposed between the outer circumferential surface and the inner circumferential surface, and the diameter D ₁ of the through hole 8 of the upper annular fitting 1 > the upper part of the inner cylindrical fitting B. Outer diameter
It is formed in D ₂ . 9 is a bearing, and 10 is a concave reinforcing portion. Also, the known example shown in FIG.
In the known example shown in the figure, the lower annular fitting 2 in the outer cylindrical fitting A does not exist, and the outer circumferential surface 6 including the step 5 of the inner cylindrical fitting B and the outer cylindrical fitting corresponding to the upper annular fitting 1 in FIG. The structure in which a vibration-proof rubber sleeve 7 is interposed between the inner circumferential surface of A and the outer circumferential surface and the inner circumferential surface are joined is different from the first known example shown in FIG. The rest of the configuration is the same. In the above-mentioned first known example and second known example, when an axial load P is applied, the diameter D ₁ of the through hole of the upper annular fitting 1 or the outer cylindrical fitting A > the upper outer side of the inner cylindrical fitting B. Because it is formed with a diameter D ₂ , the upper part of the inner cylinder fitting B protrudes upward from the through hole 8 of the upper annular fitting 1 due to repeated loads, especially large loads, and there is no stopper action, so the vibration-proof rubber sleeve 7 Severe strain was applied, and the vibration isolating rubber sleeve 7 was damaged and peeled from the outer cylindrical metal fitting A and the inner cylindrical metal fitting B, resulting in a lack of durability. Further, as shown in the first known example, the outer circumferential surface of the vibration-proof rubber sleeve 7 whose inner circumferential surface is joined to the inner tube fitting B is attached to the inner surface of each of the upper annular fitting 1 and the lower annular fitting 2, which are the outer tube fitting A. The work of joining them together was difficult. Furthermore, the spring characteristics in the second known example had a linear shape as shown in FIG. 5A, and the maneuverability was also insufficient. The present invention improves on the drawbacks of the above-mentioned known vibration isolating rubber for strut-type suspension systems. A lower annular metal fitting having a hanging flange that hangs downward is fixed at both horizontal flanges to constitute an outer cylinder metal fitting, and the outer circumferential surface of the inner cylinder metal fitting located inside the lower annular metal fitting side of the outer cylinder metal fitting and the lower annular metal fitting are fixed at both horizontal flanges. A vibration-proof rubber sleeve is interposed between the inner circumferential surface of the hanging edge of the metal fitting and joined to the outer circumferential surface and the inner circumferential surface, and
A vibration isolating rubber layer is formed on the dish-shaped inner surface of the upper annular metal fitting except for the horizontal flange, and a gap is formed between the lower surface of the vibration isolating rubber layer and the upper surface of the vibration isolating rubber sleeve. The gist of this invention is a vibration isolating rubber for a strut-type suspension system, which is constructed such that the hole diameter is smaller than the outer diameter of the upper part of the inner cylindrical metal fitting.

The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 3 is a longitudinal sectional view showing the first embodiment of the present invention, in which a through hole 12 is formed at the center of the upper surface of an inverted dish shape having a horizontal flange 11a on the periphery, and the dish shape excluding the inner surface of the flange 11a. An upper annular metal fitting 11 is constructed by forming a vibration-proof rubber layer 13 over the recessed portion and the edge of the through hole 12 by vulcanization adhesion. The vibration-proof rubber layer 13 is formed to have a dish-like thickness. The lower annular fitting 21 has a horizontal flange 21a on its periphery, and a hanging flange 21b that hangs downward continuously from the flange 21a. For example, the outer cylindrical metal fitting A is formed by joining with bolts 30 or the like. From the bottom opening of the outer peripheral fitting A,
The inner cylindrical fitting B, which is provided with a stepped portion 41 by forming the upper part with a small diameter, is inserted into the lower annular fitting 21, and the outer circumferential surface 41 of the inner cylindrical fitting B including the stepped portion 41 is inserted into the lower annular fitting 21.
The anti-vibration rubber sleeve 22 is interposed between the portion extending over the upper edge 41b and the inner surface of the hanging flange 21b of the lower annular fitting 21, and the inner circumferential surface thereof is connected to the outer circumferential surface 41a including the stepped portion 41 of the inner cylindrical fitting B. and upper edge 41b
The outer peripheral surface is vulcanized and adhered to the inner surface of the hanging flange 21b, and a gap 50 is created between the lower surface of the vibration-proof rubber layer 13 and the upper surface of the vibration-proof rubber sleeve 22.
is formed. Further, the hole diameter D ₁ of the upper annular metal fitting 11 in the outer cylindrical metal fitting A is larger than the upper outer diameter D ₂ of the inner cylindrical metal fitting B. 42 is a bearing.

The second embodiment of the present invention shown in FIG.
The upper and lower sides are formed to have the same outer diameter, and 41 is a stepped portion formed by a recessed portion that bends inward.
The rest of the structure is similar to the first embodiment shown in FIG. 3, and the same reference numerals indicate the same parts in FIGS. 3 and 4.

In the present invention, when an upward load P is applied in the axial direction as shown in FIGS. 3 and 4, the inner cylindrical fitting B is pushed upward through the gap 50, but
D ₁ <Since the anti-vibration rubber layer 13 is formed on the outer diameter of the upper part of the inner cylindrical metal fitting and is formed on the dish-shaped inner surface of the upper annular metal fitting 11 except for the horizontal flange 11a,
Upper edge 41b of inner cylinder fitting B and anti-vibration rubber sleeve 2
The upper surface of 2 is impact-damped by the lower surface of the anti-vibration rubber layer 13, and the stopper action and buffering effect of the anti-vibration rubber layer 13 is maintained not only when a repeated load is applied, but also when a large load is applied. The action prevents the vibration-proof rubber sleeve 22 from being subjected to unreasonable strain or strain exceeding its limit, and prevents damage to the vibration-proof rubber sleeve 22 and separation from the outer cylinder metal fitting A and the inner cylinder metal fitting B as much as possible. Durable to use. Furthermore, when comparing the spring characteristics with the known example shown in FIG. 2, as shown in the graph of FIG. 5, the known example shown in FIG. It has outstanding non-linear spring characteristics and has superior steering stability compared to known vibration isolating rubber for strut-type suspension systems that change smoothly. Also, vibration-proof rubber layer 13,
The anti-vibration rubber sleeve 22 is separately vulcanized and formed into an upper annular fitting 11, a lower annular fitting 21 and an inner cylindrical fitting B.
Since it can be bonded to other parts, molding is easy.

As described above, the present invention has the effect of making it possible to obtain a vibration isolating rubber for a strut-type suspension system that has excellent durability, stability, and moldability.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the first known example, and Fig. 2 is a longitudinal sectional view of the second known example.
3 is a longitudinal sectional view of the first embodiment of the present invention, FIG. 4 is a longitudinal sectional view of the second embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of the known example of FIG. 2. It is a graph comparing the spring characteristics with the present invention. DESCRIPTION OF SYMBOLS 11... Upper annular metal fitting, 11a... Horizontal flange, 12... Through hole, 13... Anti-vibration rubber layer, 21...
...Lower annular metal fitting, 21a...Horizontal flange, 21
b...Drooping flange, 22...Vibration-proof rubber sleeve, A...Outer cylinder metal fitting, B...Inner cylinder metal fitting, 50...
gap.

Claims (1)

[Scope of utility model registration request] The outer cylindrical metal fitting is constructed by fixing an upper annular metal fitting with a horizontal flange and an inverted dish-shaped upper surface with a through hole and a lower annular metal fitting having a hanging flange that hangs down continuously from the horizontal flange at both horizontal flanges. A vibration-proof rubber sleeve is interposed between the outer circumferential surface of the inner tube fitting located inside the lower annular fitting side of the outer tube fitting and the inner circumferential surface of the hanging edge of the lower annular fitting. A vibration isolating rubber layer is bonded to the inner circumferential surface, and a vibration isolating rubber layer is formed on the dish-shaped inner surface, excluding the horizontal flange of the upper annular fitting, to create a gap between the lower surface of the vibration isolating rubber layer and the upper surface of the vibration isolating rubber sleeve. form,
The vibration isolating rubber for a strut-type suspension device is configured such that the diameter of the through hole of the upper annular metal fitting is smaller than the outer diameter of the upper part of the inner cylindrical metal fitting.