JPH0552382U - Leaf spring - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a leaf spring that does not corrode the leaf spring even if water adheres. [Structure] A leaf spring L made of a steel plate such as spring steel and a spacer S made of titanium, which has a greater ionization tendency than steel, are alternately stacked with their total lengths shortened from the top. The uppermost stage is the first leaf spring 10 and the lowermost stage is the lowermost leaf spring 18. The central portion of the leaf spring L and the spacer S is fastened with a central bolt 20. Fastening portions 10a are formed at both ends of the first leaf spring 10, and the fastening portions 10a are rotatably fastened to the support plates 28, 30 and the suspension plate 32 of the vehicle body 26. On the other hand, below the lowermost leaf spring 18, an axle is attached with a U-shaped bolt.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a leaf spring used as a component such as a vehicle suspension.

[0002]

[Prior Art]

 BACKGROUND ART Vehicle suspensions include leaf spring type suspensions that are configured by stacking appropriate numbers of leaf springs of different lengths. This leaf spring type suspension is constructed by fixing both ends of the leaf spring to the vehicle body and fixing an axle to the substantially central portion of the leaf spring.

If the leaf springs have a structure in which the leaf springs are directly overlapped with each other, the leaf springs will be frictionally caused by the bending of the leaf springs, which will cause the leaf springs to wear. Therefore, a spacer made of a flat plate-shaped synthetic resin or the like is sandwiched between these leaf springs.

[0004]

[Problems to be solved by the device]

 However, the above-described structure may cause the following problems. That is, since the leaf spring is normally exposed below the vehicle body, water may splash while the vehicle is running, or water in the air may condense, causing water droplets to adhere to the leaf spring. is there. This water droplet penetrates between the leaf spring and the spacer due to the capillary phenomenon. Since spring steel or the like is generally used as the material of the leaf spring, if water drops adhere to the surface of the leaf spring, corrosion may occur. When the leaf spring is corroded, the fatigue strength of the leaf spring is reduced, and there is a possibility that the function of the suspension pen such as absorption of vibration cannot be fully exerted.

Therefore, an object of the present invention is to provide a leaf spring capable of preventing the leaf spring from corroding even if moisture adheres to it.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the leaf spring according to the present invention is a leaf spring composed of an appropriate number of leaf springs superimposed on each other, and a material having a greater ionization tendency than the leaf springs between the leaf springs. It is characterized in that the spacer formed by is interposed and the spacer is sandwiched by the leaf spring.

[0007]

[Action]

 When the leaf spring is used in a vehicle suspension, vibrations from the road surface, tires, and wheels are transmitted to the axle when the vehicle is running, and the vibration of the axle causes bending of each leaf spring and friction of the leaf spring and spacer. The vibrations are absorbed and are prevented from being transmitted to the vehicle body.

When water splashes from below the vehicle body or water in the air condenses to attach water droplets to the leaf spring, the water droplets may enter between the leaf spring and the spacer. At this time, since the spacer is made of a material having a greater ionization tendency than the leaf spring, after a long time, a part of the surface of the spacer becomes a cation and is dissolved in water to release the electron. Is conducted to the leaf spring, water ions are decomposed on the surface of the leaf spring, and hydrogen is generated.

Therefore, when moisture enters between the leaf spring and the spacer, the leaf spring itself is not corroded by the corrosion of the spacer.

[0010]

【Example】

 Hereinafter, a leaf spring according to the present invention will be described with reference to the illustrated embodiment. In this embodiment, the case where the suspension is mounted on a leaf spring type suspension of a vehicle has been described.

As shown in FIG. 1, a first plate spring 10 made of a steel plate such as spring steel has a shape obtained by appropriately bending a substantially flat plate material and extending it. A substantially cylindrical fastening portion 10a is formed by bending appropriately. As shown in FIGS. 1 and 2, a first flat plate-shaped titanium spacer 12 which is thinner and shorter than the first plate spring 10 is in contact with the lower surface of the first plate spring 10. A second leaf spring 14 shorter than the first leaf spring 10 is in contact with the lower surface of the first spacer 12, and a substantially flat plate shape shorter than the second leaf spring 14 is provided on the lower surface of the second leaf spring 14. The second spacer 16 is in contact with.

[0012] Then, the leaf springs L made of steel and the spacers S made of titanium are alternately overlapped with each other, and their total lengths are shortened in order from the upper side, and the lowermost leaf spring 18 is superposed on the lowermost step. . Further, central bolts 20 penetrating from the first leaf spring 10 to the lowermost leaf spring 18 are fastened to substantially the central portions of the leaf spring L and the spacer S, and both end portions of the first leaf spring 10 are tightened. A leaf spring 24 is constructed by fastening a fastening tool 22 for fastening the leaf spring L and the spacer S, which are superposed at these positions, from above and below in the vicinity.

On the other hand, front and rear supporting plates 28, 30 are provided at appropriate positions on the vehicle body 26 of the vehicle shown by the chain double-dashed line in FIG. 1 at a distance substantially equal to the entire length of the leaf spring 24. One of the leaf springs 24 has a fastening portion 10a rotatably attached to the front support plate 28. The other fastening portion 10a of the leaf spring 24 is rotatably attached to one end of the suspension plate 32, and the other end of the suspension plate 32 is rotatably attached to the rear support plate 30. It is installed.

Further, an axle 34 is positioned substantially orthogonal to the lower surface of the lowermost leaf spring 18 of the leaf spring 24, and the leaf spring 24 is sandwiched by the axle 34 from above the leaf spring 24. A U-shaped bolt 36 is attached. Therefore, the U-shaped bolt 36 and the axle 34 clamp the first leaf spring 10 to the lowermost leaf spring 18. Wheels and tires (not shown) are attached to both ends of the axle 34.

The operation of the leaf spring 24 configured as described above will be described below.

During normal traveling, vibrations generated between the road surface and the tires are transmitted to the leaf springs 24 via the wheels and the axles 34. In the leaf spring 24, the vibrations are absorbed when the leaf springs L bend and when friction occurs between the leaf springs L and the spacers S, and the vibrations are not transmitted to the vehicle body 26. Therefore, the ride comfort of the passengers is not impaired.

By the way, when water is splashed during traveling or when water in the air is condensed, water droplets may adhere to the leaf spring 24. The attached water droplets enter between the leaf springs L and the spacers S by a capillary phenomenon. When moisture enters between the leaf spring L and the spacer S for a long time, titanium, which is the material of the spacer S, has a greater ionization tendency than spring steel, which is the material of the leaf spring L. A part of the spacer S becomes a cation and melts into water, so that the spacer S is corroded. The electrons emitted when titanium turns into positive ions are conducted to the steel leaf spring L and decompose water ions on the surface of the leaf spring L to generate hydrogen and hydroxide ions.

That is, according to the present embodiment, since spring steel is used as the material of the leaf spring L and titanium is used as the material of the spacer S, the spacer S has a greater tendency to turn on than the leaf spring L. . Therefore, the leaf spring L does not corrode due to the corrosion of the spacer S, and it is possible to prevent the fatigue strength of the leaf spring L from decreasing due to corrosion.

Further, since titanium having an appropriate hardness is used as the material of the spacer S, it is not easily worn by the friction between the leaf spring L and the spacer S. Therefore, the function as a suspension can be fully exerted and the life of the leaf spring 24 is extended, so that the frequency of replacement is reduced and the cost is not increased.

In this embodiment, titanium is used as the material of the spacer S, but any material having a greater ionization tendency than the material of the leaf spring L may be used, for example, cobalt may be used.

Further, in this embodiment, the spacer S has a shape substantially equal to the leaf spring L and is sandwiched over the entire length between the leaf springs L. However, for example, the spacers are provided only at both end portions and the central portion of the leaf spring L. It does not matter even if the structure is such that they are sandwiched. In this case, since the spacer may be small, the weight of the leaf spring can be reduced and the cost can be reduced.

[0022]

[Effect of the device]

 As described above, according to the leaf spring of the present invention, when the spacers having a large ionization tendency are sandwiched between the leaf springs, when moisture enters between the leaf springs and the spacer, It is possible to prevent the leaf spring itself from corroding due to the corrosion of the spacer. Therefore, the fatigue strength of the leaf spring does not decrease, and the functions of the suspension, such as damping the vibration of the vehicle body, can always be sufficiently exerted.

Further, since the life of the leaf spring is extended, the frequency of replacement is reduced, which is economically advantageous.

[Brief description of drawings]

FIG. 1 is a perspective view of a leaf spring as a suspension.

FIG. 2 is a partially omitted side view in which a part of a side surface of a leaf spring is enlarged.

[Explanation of symbols]

 10 First leaf spring 12 First spacer 14 Second leaf spring 16 Second spacer 18 Bottom leaf spring 24 Leaf spring 26 Vehicle body 34 Axle L Leaf spring S Spacer

Claims (1)

[Scope of utility model registration request] 1. A leaf spring formed by stacking an appropriate number of leaf springs, wherein a spacer made of a material having a greater ionization tendency than the leaf springs is interposed between the leaf springs. A leaf spring, which is sandwiched by the leaf springs.