JP4854468B2 - Bump stopper - Google Patents

Description

  The present invention relates to a bump stopper for stopping a swing while bumping, which is a large swing during driving of an automobile. More specifically, the present invention includes a stopper member and a holding fitting that holds and fixes the stopper member. A bump stopper is provided with an annular groove on the outer peripheral surface of the stopper member that is close to the metal fitting, with the holding metal fitting side as the base, so that the deformed portion of the groove prevents the deformed portion of the stopper member from contacting the holding metal. About.

The bump stopper works, for example, when the suspension of an automobile is bent to near the limit of the range of motion, so that the impact from the wheel is not transmitted directly to the body. A rubber stopper member that can withstand bumps of the vehicle body is held and fixed. Therefore, since the load at the time of bump from the vehicle body is considerably large, in order to absorb it, the rubber volume of the stopper member is increased, and the structure is configured to receive the large load at the time of bump by its large deformation. On the other hand, the holding metal must naturally be able to withstand a heavy load at the time of bumping, and it is necessary to prevent deterioration due to corrosion or the like. The following techniques are known to deal with such a situation.
JP2000-291707 7-41099 JP-A-9-52505 JP-A-9-300931

  As shown in FIG. 11, the bump stopper disclosed in Patent Document 1 is used for a suspension of an automobile by attaching a rubber stopper member 51 to a holding metal fitting 50. The holding metal fitting 50 includes a bottom wall 52, a side wall 53 rising from the periphery of the bottom wall 52, and a flange 54 extending outwardly following the side wall 53. On the other hand, the stopper member 51 has a cylindrical shape and includes an inside thereof. An inner peripheral groove 55 and an outer peripheral groove 56 are provided in a bellows shape on the peripheral surface and the outer peripheral surface. When the stopper member 51 is compressed in the direction of the holding metal fitting 50, the outwardly deformed portion of the compressed stopper member 51 rides on the flange 54 due to the influence of the inner circumferential groove 55 and the outer circumferential groove 56, and becomes a suspension. The holding metal fitting 50 protects against direct contact. On the other hand, the inwardly deformed portion of the stopper member 51 is absorbed by the cavity in the cylinder, and the buckling of the stopper member 51 itself can be prevented.

  As shown in FIG. 12, the bump stopper disclosed in Patent Document 2 is provided with a rubber stopper member 61 attached to a holding metal fitting 60. The stopper member 61 includes a rod fitting portion 62 that is held and fixed to the holding metal fitting 60, and a rod fitting portion 62 attached thereto. It has a bellows-like elastic expansion / contraction part 63, and an annular groove 64 is provided at the boundary between the rod fitting part 62 and the elastic expansion / contraction part 63. In particular, when the stopper member 61 is compressed in the direction of the holding metal 60, the deformation of the rod fitting portion 62 of the compressed stopper member 61 is absorbed by the annular groove 64, and the elasticity when receiving the compressive force and the tensile force. Appropriate elastic deformation of the stretchable part 63 can be ensured.

  As shown in FIG. 13, the bump stopper of Patent Document 3 is provided with a rubber-made cylindrical stopper member 71 mounted on a holding metal fitting 70, and the stopper member 71 has an annular groove 72 and an outer peripheral surface and an inner peripheral surface thereof. 73 and the abutting portion at the tip of the stopper member 71 is made thick (t1 <t2). When the stopper member 71 comes into contact and is compressed in the direction of the holding metal fitting 70, excessive deformation is suppressed and concentrated by the thick portion t2, and there is no concern about buckling.

  As shown in FIG. 14, the bump stopper disclosed in Patent Document 4 is provided with a rubber-made cylindrical stopper member 81 attached to a holding fitting 80, an annular groove 82 provided on the outer periphery of the stopper member 81, and a stopper on the holding fitting 80. The base 83 of the member 81 is held in a loosely fitted state. And, at the time of non-bumping, the stopper member 81 becomes a free length, can be bent and deformed relatively easily with respect to the stopper member 81, no stress concentration occurs, the dynamic spring constant is kept low, and the ride comfort is good. When the bending of the stopper member 81 is increased at the time of bumping, the base 83 is filled and restrained in the holding metal 80, so that the rigidity of the stopper member 81 is increased, the dynamic spring constant is increased, and the stopper function is exhibited.

  In the case of Patent Document 1, the inner peripheral groove 55 and the outer peripheral groove 56 of the cylindrical stopper member 51 are bumped on the flange 54 of the holding bracket 50 and do not directly hit the suspension during bumping. However, the rubber stopper member 51 hits against the metal flange 54 so that it is not damaged and has a difficulty in durability. Moreover, the inwardly deformed portion is easily absorbed because the stopper member 51 is a cylinder, and the outwardly deformed portion is reduced in quantity, thereby reducing the damage to the stopper member 51 itself. On the other hand, since the stopper member 51 is cylindrical with respect to the impact at the time of bumping, the cushioning force is reduced as the rubber volume is small.

  In the case of Patent Document 2, the deformed portion of the rod fitting portion 62 of the stopper member 61 is absorbed by the annular groove 64 at the time of bump, but the bellows-like elastic elastic portion 63 made of rubber hits the metal holding fitting 60. Damage is not removed and durability is difficult. Moreover, the inwardly deformed portion is easily absorbed by the stopper member 61 as in the case of Patent Document 1, and the deformed portion is reduced in quantity, while reducing the damage of the stopper member 61 itself, The shock-absorbing force is reduced due to the small rubber volume against the bump impact.

  In the case of Patent Document 3, the deformed portion of the stopper member 71 is absorbed by the annular grooves 72 and 73 at the time of bumping, and excessive deformation is not suppressed and concentrated by the thick portion t2 at the tip of the stopper member 71. Since the stopper member 71 made of metal hits the metal holding metal fitting 70 and is not damaged, the durability is difficult. Further, as in the case of Patent Document 1, the cushioning force is reduced by the amount of the rubber volume of the stopper member 71 with respect to the impact at the time of bumping.

  In Patent Document 4, the base 83 of the stopper member 81 is filled and restrained in the holding fitting 80 at the time of bumping, thereby exhibiting a stopper function. However, the rubber stopper member 81 is made of a metal holding fitting 80. In this case, it is hard to damage and has difficulty in durability. Further, as in the case of Patent Document 1, the buffering force is reduced because the rubber volume of the stopper member 81 is small with respect to the impact at the time of bumping.

  Therefore, the object of the present invention is that the stopper member has a large rubber volume, but there is no possibility of hitting the holding metal fitting due to deformation at the time of bumping, and the anti-corrosion treatment of the holding metal fitting can be easily and reliably applied. In addition to improving the durability of the holding metal, the object is to provide a bump stopper that is truly durable.

The present invention has been proposed in order to achieve the above object, and is characterized by having the following configuration.
That is, according to the present invention, it comprises a stopper member configured in a conical shape made of a rubber material, and a holding metal fitting that protects and fixes the stopper member and can be attached to another member, and the outer peripheral surface of the stopper member Bumps characterized in that an annular groove having an orientation in the range of 20 degrees to 70 degrees with respect to the holding fixing surface of the holding metal is provided in a portion adjacent to the holding metal. A stopper is provided.

  In addition, according to the present invention, there is provided a bump stopper in which a covering surface made of the rubber material is formed on a portion of the holding metal member excluding a holding and fixing portion of the stopper member and an attachment surface with the other member.

  According to the present invention, there is provided a bump stopper in which a rubber material supply hole is provided in the holding metal fitting and the covering surface is integrally formed when the stopper member is formed in the holding metal fitting.

  Moreover, according to this invention, the bump stopper which provided the seal | sticker part in the boundary of the coating | coated surface by the said rubber material and the said attachment surface is provided.

  The bump stopper according to the present invention is deformed only outward when a large load is applied to the conical columnar stopper member attached to another member during bumping, but the outward deformation is absorbed by the groove facing the anti-holding bracket side. In addition, since it does not face the holding bracket side, it does not contact the holding bracket. Therefore, since the stopper member has a large rubber volume, it does not hit the metal holding bracket, so the durability is increased without damaging the stopper member, and the cushioning force can be maintained high due to the large rubber volume. .

  In the bump stopper of the present invention, the direction of the groove on the stopper member on the side opposite to the holding bracket is in the range of 20 to 70 degrees, preferably in the range of 35 to 55 degrees with respect to the holding and fixing surface of the holding bracket. As a result, the outward deformation of the stopper member is surely absorbed by the groove without being directed toward the holding metal and does not contact the holding metal. Therefore, the above effect can be achieved more reliably.

  In addition, the bump stopper of the present invention has a portion exposed to the air when a covering surface made of a rubber material is formed on a portion of the holding bracket excluding the holding and fixing portion of the stopper member and the mounting surface with the other member. There is an advantage that it does not corrode. Therefore, in addition to the above effects, a separate painting process is omitted, which contributes to labor savings, and the anti-corrosion treatment of the holding metal can be performed easily and reliably. It is also possible to increase the durability, and it is possible to provide durability.

  In addition, the bump stopper of the present invention is provided with the rubber material supply hole in the holding metal fitting, so that when the stopper member is formed on the holding metal fitting, the rubber stopper supplied to the supply hole also turns to the surface covered. The surface can be covered with a rubber material and molded integrally. Therefore, in addition to the above effects, not only is there a separate process for painting, but when molding a stopper member on the holding bracket, the surface covered with a rubber material can be covered, and the integrity is maintained by the anchoring effect. There is an effect that can be done.

  In addition, the bump stopper of the present invention blocks moisture that causes corrosion if a seal portion is provided at the boundary between the mounting surface and the covering surface of the holding metal fitting that cannot form a covering surface made of a rubber material, Do not corrode the mounting surface. Therefore, in addition to the above effects, there is no need for a separate process on the mounting surface of the holding metal, and the anti-corrosion treatment of the holding metal can be performed easily and reliably, and the durability of the holding metal as well as the stopper member And has the effect of being truly durable.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

1 is a sectional view showing a bump stopper of the present invention, FIG. 2 is a sectional view showing a deformed state of a stopper member when a large load is applied to the bump stopper of FIG. 1, and FIG. 3 is a modified example of the bump stopper of the present invention. FIG. 4 is a sectional view showing a deformed state of the stopper member when a large load is applied to the bump stopper of FIG.
In these drawings, the bump stopper 1 is composed of a stopper member 2 made of a rubber material in the shape of a conical column, and a holding metal fitting 4 that holds and fixes the stopper member 2 and can be attached to another member 3. A groove 6 directed toward the anti-holding metal fitting is provided at a portion of the outer peripheral surface 5 of the stopper member 2 that is close to the holding metal fitting 4. It is comprised so that it may not contact | abut.

  The stopper member 2 has a conical column shape without a cavity, and first differs in shape from a cylindrical shape with a cavity as in Patent Documents 1 to 4, which are conventional examples. Therefore, the stopper member 2 has a large rubber volume and can maintain a high buffering force against a large load. The rubber material of the stopper member 2 is not particularly limited, and natural rubber (NR) and / or synthetic rubber alone or a blended product can be used.

  The stopper member 2 made of such a material is provided with a groove 6 directed toward the anti-holding metal fitting at a portion of the outer peripheral surface 5 near the holding metal fitting 4, and the direction of the groove 6 depends on the axis 10 of the groove 6. And the angle α of the holding metal fitting 4 with respect to the holding and fixing surface 11 is in the range of 20 degrees to 70 degrees, particularly preferably in the range of 35 degrees to 55 degrees. If the orientation angle α of the groove 6 exceeds 70 degrees, the deformed portion 7 of the stopper member 2 at the time of bumping may spread outward, and the rubber between the groove 6 and the trumpet-shaped peripheral edge 12 may hit the holding metal fitting 4. Come out. If the angle α is less than 20 degrees, there is no escape area of the deformed portion 7 of the stopper member 2 at the time of bumping, and it hits the trumpet-shaped peripheral edge 12 of the holding metal fitting 4 and the portion is damaged. If the orientation angle α of the groove 6 is about 70 degrees as shown in FIGS. 3 and 4, the upper mold of the mold can be smoothly pulled out as it is, and the bump stopper 1 of the present invention can be manufactured. It becomes extremely easy.

  The holding metal fitting 4 is formed in a circular tray shape with a trumpet-shaped peripheral edge 12 spreading outward, a bolt hole 13 is opened at the center thereof, and a bolt 14 is passed through the bolt hole 13. It can be attached and fixed to the other member 3. Therefore, even if the deformed portion 7 of the stopper member 2 at the time of bump hits by the trumpet-shaped peripheral edge 12 of the holding metal fitting 4, the degree of damage is buffered. In the holding metal fitting 4, a covering surface 18 made of the same rubber material as that of the stopper member 2 is formed in a portion 17 excluding the holding fixing portion 15 of the stopper member 2 and the attachment surface 16 with the other member 2.

  Therefore, since the covering surface 18 of the rubber material is present on the holding metal fitting 4, there is no portion exposed in the air, and corrosion due to oxidation of the holding metal fitting is remarkably suppressed. The exposed portion of the holding metal fitting 4 is usually painted in a separate process. When the rubber member stopper member 2 is fixed on the holding metal fitting 4, a covering surface 18 made of the rubber material is formed. The anticorrosion treatment of the holding metal fitting 4 can be performed easily and reliably, and the durability of the holding metal fitting 4 as well as the stopper member 2 can be improved. Both the stopper member 2 and the holding metal fitting 4 have durability. It will be a thing.

  When forming the covering surface 18 of the rubber material on the holding metal 4, as a more effective method, a rubber material supply hole 20 is opened in a part of the holding metal 4 and the stopper member 2 is formed on the holding metal 4. In doing so, the covering surface of a part of the rubber material supplied through the supply hole 20 is molded in a state in which the front and back of the holding metal fitting 4 are integrally covered by the anchoring effect. Accordingly, not only the coating as a separate process is eliminated, but also when the stopper member 2 is formed on the holding metal fitting 4, it can be easily formed integrally with the rubber material including the covering surface 18.

  A partially enlarged view of the covering surface 18 of the holding metal fitting 4 is shown in FIGS. FIG. 9 shows a state in which the covering surface 18 of the holding metal fitting 4 is covered with rubber without forming the rubber material supply hole 20, and FIG. 10 shows the rubber material supply hole 20 formed in a part of the holding metal fitting 4. The state in which the covering surface 18 is covered with the rubber material by supplying a part of the rubber material through the supply hole 20 is shown. The rubber material supply hole 20 is preferably formed slightly above the portion 17 excluding the holding fixing portion 15 of the stopper member 2 and the mounting surface 16 of the other member 2 on the trumpet-shaped peripheral edge 12 of the holding metal fitting 4. It is preferable that the seal portion 21 does not turn to the mounting surface 16 and stops at the R portion of the trumpet-shaped peripheral edge 12, so that the fixing of the mounting surface 16 is not hindered.

  The mounting surface 16 of the holding metal 4 with the other member 2 cannot be covered with a rubber material because of its structure, but a seal portion 21 is provided at the boundary between the covering surface 18 and the mounting surface 16. An enlarged view of the seal portion 21 is shown in FIG. The seal portion 21 blocks moisture that causes corrosion and prevents the mounting surface 16 from being corroded. This eliminates the need for a separate coating process on the mounting surface 16 of the holding metal fitting 4 and allows the mounting surface 16 of the holding metal fitting 4 to be easily and reliably subjected to anticorrosion treatment. The durability of the metal fitting 4 can also be increased.

The bump stopper 1 of the present invention having the above configuration is manufactured as follows.
First, in addition to natural rubber (NR) and / or synthetic rubber, various additives are mixed so as to be uniform, and then sufficiently kneaded at a vulcanization temperature or lower (for example, about 100 ° C.). On the other hand, the holding metal fitting 4 having the bolts 14 fixed to the bolt holes 13 is set in a mold, and the above kneaded composition is injected at a pressure of about 200 kg / cm ² from the injection port of the mold, and then at about 170 ° C. By performing vulcanization adhesion for 15 minutes, the bump stopper 1 of the present invention is obtained. At that time, the surface of the holding metal fitting 4 is rotated from the small supply hole 20 to the surface covered with the kneaded blend product, and the surface is covered with the rubber composition to form the covering surface 18 integrally. The seal portion 21 is also integrally formed at the boundary with the mounting surface 16. Further, as described above, when the orientation angle α of the groove 6 of the stopper member 2 is about 70 degrees, the upper die of the mold can be smoothly pulled out as it is, and the production of the bump stopper 1 is extremely easy. Become.

  The two bump stoppers 1 manufactured as described above are attached obliquely adjacent to the suspension of an automobile. As a result, when a bump is generated when the automobile is running, the stopper member 2 hits the counterpart member, forcibly stops the bump at that position, and the impact at that time is buffered by the compression deformation of the stopper member 2. , So as not to communicate directly.

Next, the effectiveness of the bump stopper 1 of the present invention having the above configuration will be demonstrated.
<Experimental example 1>
The bump stopper has the shape shown in FIG. 1, the groove orientation angle α is about 45 degrees, and a load is gradually applied from 1KN to 10KN on the mating member, and the state of deformation of the stopper member during that time is visually observed. And observe the contact state of the holding member with the trumpet-shaped peripheral edge.
The result is shown in FIG.

<Experimental example 2>
The tested bump stopper has the shape shown in FIG. 3, the groove orientation angle α is set to about 70 degrees, and observation is performed in the same manner as in Experimental Example 1. The result is shown in FIG.

<Comparative example 1>
The tested bump stopper has the shape shown in FIG. 5 having no grooves, and was observed in the same manner as in Experimental Example 1, and the result is shown in FIG.

<Comparative example 2>
The tested bump stopper has the shape shown in FIG. 7 and the groove orientation angle α is 0 degree. The groove stopper is observed in the same manner as in Experimental Example 1, and the result is shown in FIG.

  As shown in FIGS. 2 and 4, in Experimental Examples 1 and 2, which are embodiments of the present invention, even when a large load of 10 KN is applied to the stopper member, the deformed portion substantially contacts the trumpet-shaped periphery of the holding member. Not touching. In Experimental Example 2, it seems that the tongue-shaped deformed portion hits the trumpet-shaped peripheral edge, but there is a gap between the upper deformed portion and the tongue-shaped deformed portion is on the trumpet-shaped peripheral edge. Yes, virtually no contact. In contrast, in Comparative Examples 1 and 2, as shown in FIGS. 6 and 8, when a large load of 10 KN is applied to the stopper member, the deformed portion substantially contacts the trumpet-shaped peripheral edge of the holding member. . Therefore, it is understood that the experimental examples 1 and 2 of the present invention have an extremely low possibility of occurrence of damage to the stopper member, while the comparative examples 1 and 2 have an extremely high possibility of occurrence of damage.

  As mentioned above, although the Example of this invention was described, it should be understood that a concrete structure is not limited to this, and the change in the range which does not deviate from the summary of this invention is possible suitably.

  The bump stopper of the present invention is highly available when the rubber volume of the stopper member is large in order to withstand deformation at the time of stronger bumps, and in particular, the anti-corrosion treatment of the holding metal fittings is easily and reliably performed to aim at low cost. At the same time, the durability of not only the stopper member but also the holding metal fitting is increased, and when it is desired to obtain a bump stopper that is truly durable, its applicability is extremely high.

It is sectional drawing which shows the bump stopper shown in the Example of this invention. It is sectional drawing which shows the deformation | transformation state of the stopper member at the time of applying a heavy load to the bump stopper of FIG. It is sectional drawing which shows the modification of the bump stopper shown in the Example of this invention. It is sectional drawing which shows the deformation | transformation state of the stopper member at the time of applying a heavy load to the bump stopper of FIG. 6 is a cross-sectional view showing a bump stopper of Comparative Example 1. FIG. It is sectional drawing which shows the deformation | transformation state of the stopper member at the time of applying a heavy load to the bump stopper of FIG. 10 is a cross-sectional view showing a bump stopper of Comparative Example 2. FIG. It is sectional drawing which shows the deformation | transformation state of a stopper member at the time of applying a heavy load to the bump stopper of FIG. It is the elements on larger scale of the covering surface of a holding metal fitting. It is the elements on larger scale of the covering surface when the rubber material supply hole is formed in the holding metal fitting. It is sectional drawing which shows an example of the conventional bump stopper. It is sectional drawing which shows another example of the conventional bump stopper. It is sectional drawing which shows another example of the conventional bump stopper. It is sectional drawing which shows another example of the conventional bump stopper.

Explanation of symbols

1: Bump stopper 2, 51, 61, 71, 81: Stopper member 3: Other member 4, 50, 60, 70, 80: Holding bracket 5: Outer peripheral surface 6: Groove 7: Deformed portion 8: Counter member 10: Axis 11: Holding fixing surface 12: Trumpet-shaped peripheral edge 13: Bolt hole 14: Bolt 15: Holding fixing portion 16: Mounting surface 17: Site 18: Cover surface 20: Rubber material supply hole 21: Sealing portion 52: Bottom wall 53: Side wall 54: Flange 55: Inner circumferential groove 56: Outer circumferential groove 62: Rod fitting part 63: Elastic expansion / contraction part 64, 72, 73, 82: Annular groove 83: Base

Claims (4)

A portion of the stopper member made of a rubber material configured in a conical shape and a holding fitting that protects and adheres to the stopper member and can be attached to another member, and is close to the holding fitting on the outer peripheral surface of the stopper member Further, a bump stopper characterized in that an annular groove having a direction in the range of 20 degrees to 70 degrees with respect to the holding and fixing surface of the holding metal is provided on the holding metal side . The holding fixing portion of the stopper member and the portion of the holding metal fitting excluding the mounting surface of the other member, the bump stopper of claim 1, wherein the formation of the coating surface by the rubber material. The supply hole of the rubber material is provided on the holding bracket, when forming the stopper member in the holding fixture by rubber material is supplied through the supply hole, according to claim 2, wherein molded integrally the coating surface Bump stopper. 4. The bump stopper according to claim 2 , wherein a seal portion is provided at a boundary between the covering surface made of the rubber material and the mounting surface.

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