JPS5851086Y2 - bamba springs - Google Patents

Description

[Detailed explanation of the invention] Summary of the invention> This invention relates to a bumper spring that is installed between a bumper attached to a vehicle such as an automobile and the vehicle body frame and has a shock absorbing function. This invention relates to a pamper spring in which opposing curved portions of a spring member made of an elastic material such as a reinforcing thermosetting resin material have a shock absorbing function.

<Prior Art> In general, safety bumpers attached to the front and rear of vehicles such as automobiles are installed between the back surface of the bumpers and the vehicle body frame via shock absorbers for impact absorption.

<Problems with the prior art> The structure of the above-mentioned shock absorber is effectively a so-called menasco-type shock absorber in which a compressible solid is contained in the cylinder and shock absorption is achieved through a piston. However, this type of device not only has the disadvantages of complex structure, large weight, and high cost, but also
This has the disadvantage that it can only absorb shocks mainly from the front and rear directions, and cannot sufficiently absorb shocks from the left and right directions to the bumper.

In addition, another type has been devised in which the elastic member is formed into a cylindrical shape and the bumper impact is absorbed by contraction in the diametrical direction of the cylinder to simplify the structure. However, if a load higher than the breaking load is applied to the elastic member, there is a risk that the bumper will break and the bumper will separate from the vehicle body, and thus cannot fulfill its function.

<Purpose of the invention> This invention aims to solve the problems of the pamper spring based on the above-mentioned conventional technology, and aims to solve the problems of the pamper spring based on the above-mentioned conventional technology. It is an object of the present invention to provide an excellent bumper spring which is useful for bumper applications in the automobile industry by allowing opposing curved faces to absorb bumper shock.

<Structure of the invention> In line with the above-mentioned purpose, the structure of this invention, whose gist is the above-mentioned utility model registration claim, is to solve the above-mentioned problems by molding a lightweight member such as a continuous fiber-reinforced thermosetting resin. Therefore, when an impact is applied to the bumper, the opposing curved surfaces deform so as to approach each other, thereby exhibiting an impact absorption effect, and if the impact to the bumper is excessive, the opposing curved surfaces deform as described above when deformed. A technical means in which the curved surfaces restrict their proximity to each other, thereby preventing the generation of destructive stress and maintaining the original shape, and furthermore, being able to be restored by the elastic action of the curved surfaces after the impact is removed. This study included the following.

<Embodiment - Configuration> Next, an embodiment of this invention will be described based on the drawings as follows.

In Fig. 1, reference numeral 1 indicates the front part of an automobile, and based on this invention, a pump spring 5 is interposed between a stay 3 connected to the frame of a car body 2 and the back surface of a bumper 4 made of well-known material and shape. has been done.

The structure of the pamper spring 5 consists of a pair of curved spring members 6 and 6' made of lightweight continuous fiber-reinforced thermosetting resin FRP, each of which The spring members 6゜6' have their curved surfaces 7 and 7' facing each other, and both ends thereof are in contact with each other via a rubber spacer 8, and have a retainer 9 on the outside of the circle and are fastened with a bolt 10 and a nut 11. integrated and combined.

Furthermore, the curved surface 7°7' of each spring member 6,6'
A urethane foam 12 having a density of 01 to 0.3 is housed in the space surrounded by , and serves to reinforce the spring members 6 and 6'.

The above-mentioned pamper spring 5 has a bottom part of the curved surface 7 of the spring member 6 which is held between the mounting plate 13 and the stay 3, as shown in detail in FIG. The flange 14 is fixed with bolts 15 and attached to the stay 3, while the spring member 6'
The back surface of the bumper 4 is in contact with the curved surface 7' of the bumper 4, and a decorative bolt 16 is inserted therethrough and fixed with a nut 18 via a seat plate 17.

<Embodiment - Effect> In the above-described configuration, when the bumper 4 collides with an obstacle and a retraction force is applied to the bumper 4, the impact force is absorbed by the elastic action of the spring members 6, 6'.

That is, in response to an impact force, each spring member 6, 6' deforms its opposing curved surfaces 7, 7' in a direction toward each other to absorb the impact force, and furthermore, the urethane foam 12' installed inside The above-mentioned impact force is also absorbed by the contraction of the cylinder, and both act as a buffer.

During this period, the above-mentioned impact force is applied to the spring member 6' and then absorbed through the rubber spacer 8 interposed between the spring member 6' and the sprinkling member 6, and indirectly acts on the spring. Since the impact force is applied to the member 6, direct application of the impact force to the spring member 6 on the vehicle body 2 side is completely prevented.

Therefore, if an excessive impact force is applied to the bumper 4,
Each of the spring members 6, 6' tries to deform rapidly, but since the urethane foam 12 is installed between them, the spring members 6, 6' deform more than the maximum contracted state of the urethane foam 12. There's nothing to do.

That is, the approach of the opposing curved surfaces 7, 7' is restricted for compressive loads exceeding a certain value, and therefore, the inside of the spring members 6, 6' when the two cylindrical curved surfaces 7, 1' are at their maximum approach. By designing the stress to be greater than the destructive value, it is possible to prevent damage to the pumper spring 5.

Further, after the impact force is removed, the bumper spring 5 is immediately restored by the elastic force of the spring member 6.degree. 6' and the urethane foam 120, and the bumper 4 is returned to its initial position.

Furthermore, since the spring members 7 and 71 constituting the pamper spring 5 have a simple shape, continuous molding is possible by compression molding as shown in FIG. 4, and high productivity can be maintained. .

That is, the continuous fibers 20 drawn out from Ro/1/19 are coated with resin in the resin tank 21, and then placed in the mold 23 of the press 22.
The spring member 7.7' is formed by molding and cutting by the cutter 24.

Next, 5' shown in FIG. 5 is a pamper spring 5' of another embodiment, in which the urethane foam 12 is not interposed between the spring members 6 and 6' in the same manner as in the embodiment of FIG. 2.3. This is how it was done.

In this case as well, each curved surface 7. Similar to the previous embodiment, damage can be prevented at maximum load by designing the internal stress of each spring member 6, 6' to be less than the destruction value when T' approaches and deforms and the two are in contact. It is.

The pamper spring 5 shown in Fig. 6 has a double structure of each sprinkling member 6 m 6", and is intended to increase the rigidity and prevent a decrease in the amount of elastic deformation due to an increase in the wall thickness of the spring member. belongs to.

It should be noted that the embodiments of this invention are not limited to those described above, and it goes without saying that other embodiments are possible.

<Effects of the invention> According to this invention, in the pump spring which has a shock absorbing function and is installed between the rear surface of the bumper and the vehicle body frame, each of the pair of curved spring members is The curved surfaces are connected with each other facing each other, and the opposing curved surfaces are integrally combined in a direction in which they approach each other when absorbing a shock. Compared to a unidirectional type, it is possible to follow and buffer against impact force from each direction, and prevent damage to the knob spring by restricting the proximity of opposing curved surfaces at the set load. It also has excellent effects.

Furthermore, since it is made of a continuous fiber-reinforced thermosetting resin, it is lightweight, and as mentioned above, it is easy to mold, which has the advantage of reducing manufacturing costs.

Furthermore, since each spring member is connected through a rubber spacer, the impact force applied to the spring member on the bumper side is indirectly applied to the spring member on the car body side, so it is not directly applied to the car body. This provides an excellent effect in that no impact force is applied to the vehicle body, and the impact to the vehicle body can be more reliably absorbed.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, in which Fig. 1 is a top view of the front of an automobile, Fig. 2 is a partially enlarged view of Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4. 1 is an explanatory diagram of the spring member forming process, and FIGS. 5 and 6 are drawings showing pamper springs of different embodiments. 4...bumper, 3...body frame,
5,5'. 5"...Pampaspring, 6. 6',
6"6"...Spring member, 7.7'
......Curved surface, 8 rubber spacer.

Claims (1)

[Scope of utility model registration request] A pair of spring members having a shock absorbing function are interposed between the rear surface of the bumper and the vehicle body frame, and are formed into a curved shape using a flexible elastic material. 1. A pumper spring in which curved surfaces are formed in a direction that approaches each other during shock absorption, wherein each of the spring members is connected at both ends via a rubber spacer.