JP3090268B1 - Leaf spring type suspension and its shackle - Google Patents

Abstract

An object of the present invention is to provide a shackle that can be easily displaced in both a height direction and a torsion direction when applied to a leaf spring type suspension. SOLUTION: A shackle body 40 having a U-shaped outer shape formed of a rod-like body is provided with a pair of straight portions 40a, 40a parallel to each other.
And a curved connecting portion 40b connecting between the base ends of the straight portions 40a, 40a. The plate 42a is fitted into the serrations 44a of the linear portion 40a, and is positioned in the axial direction by the steps 46. The plate 42b is fitted into the serrations 44b of the screw portion 48. A rubber bush 68 or 74 is sandwiched between the plates 42a and 42b, and is fixed by screws 76.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf spring suspension and a shackle for supporting one end of a leaf spring rotatably supported by a frame on the frame.

[0002]

2. Description of the Related Art FIG. 1 shows an example of a leaf spring type suspension.
Is rotatably supported by the frame 6, and the other end 8 of the leaf spring 2 is swingably supported by the frame 6 via the shackle 10. An axle 12 is attached to the leaf spring 2 by a U-bolt 14 (Japanese Utility Model Application No. 57-57).
159296).

[0003] One example of a conventional shackle is, as shown in Fig. 2, assembled in a mouth shape by bush support shafts 20, 26 and shackle plates 24, 24.
That is, the bracket 16 attached to the frame 6
A boss 18 is fixed to the boss 18, and a bush support shaft 20 is passed through the boss 18 in order to rotatably attach the shackle 10 to the boss 18.
The rubber bushes 22, 22 divided into two are press-fitted, and the shackle plate 2 is placed outside the rubber bushes 22, 22.
The bush support shaft 20 is screwed in place with the bushing support shafts 20, 24, so that the rubber bushes 22, 22 are pressed from the outside, and come into close contact with the inner surface of the boss 18 and the bush support shaft 20. Similarly, at the other end 8 of the leaf spring 2, a bush support shaft 26 is passed through the ring at the other end 8, and rubber bushes 28, 28 divided from both ends of the opening of the ring at the other end 8 are press-fitted. And rubber bush 2
Shackle plate 24 arranged outside of
The bush support shaft 26 is screwed so as to press the rubber bushes 28, 28 at 24, so that the rubber bushes 28, 28 are pressed from the outside, and closely contact the inner surface of the other end 8 of the leaf spring 2 and the bush support shaft 26. I do. Thus, the other end 8 of the leaf spring 2 is rotatably attached to the shackle 10.

[0004]

In the conventional shackle 10 assembled in a mouth shape, both bush support shafts 20 and 26 are used.
Since the distance L between them is fixed by the pair of shackle plates 24, 24, the expansion and contraction of the distance L, that is, the displacement width of the suspension in the vertical direction is extremely limited. In addition, it has high rigidity against twisting and a small degree of freedom in displacement. For this reason, it is insufficient for adapting to a vehicle running in a mountainous area having a large unevenness. Therefore,
SUMMARY OF THE INVENTION It is an object of the present invention to provide a shackle that can be easily displaced in both a height direction and a torsion direction when applied to a leaf spring type suspension.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a shackle for a leaf spring type suspension, wherein one end of a leaf spring rotatably supported on a frame is supported on the frame on the other end so as to swing. Has a U-shaped shackle body formed of a rod-shaped body, a plate fitted into the shackle body to hold the rubber bush, and a screw for fixing the plate to the shackle body. The shackle body is composed of a pair of straight portions parallel to each other and a curved connecting portion connecting the base ends of both straight portions, and a circumferential rotation preventing portion is formed on the connecting portion side of the straight portion. Along with the connecting portion side of the circumferential rotation preventing portion is formed a step having a larger diameter on the connecting portion side, and the tip of the straight portion has a smaller diameter than the straight portion,
A screw portion into which the screw is screwed is provided, and a circumferential rotation preventing portion is also formed at a position on the straight portion side of the screw portion. The plate is fitted into the circumferential rotation preventing portion of the linear portion, the circumferential rotation preventing portion prevents the rotation in the circumferential direction, and the plate has a hole in which positioning in the axial direction is performed by the step, and It is fitted into the circumferential rotation preventing portion, and has a hole that can prevent the rotation in the circumferential direction by the circumferential rotation preventing portion and the axial movement can be prevented by the boundary between the screw portion and the linear portion. ing.

In the shackle according to the present invention, since the connecting portion of the shackle body is curved and the tip is open, that is, U-shaped, the shackle is not twisted even when the distance between the two straight portions changes. It is, with respect to the transverse direction of the displacement, the displacement easy, ing large degree of freedom. Apply this shackle
Leaf spring suspension of the present invention is easily absorbed large irregularities.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION As a material of a shackle body, various steels can be used, and spring steel is particularly preferable. When the shackle body is formed of spring steel, the ability to absorb irregularities becomes more remarkable. By selecting the spring constant, a suspension having desired characteristics can be obtained. One example of the curved shape of the connecting portion is an arc shape. A preferred example of the circumferential rotation preventing portion is
Serrations with axial grooves.

[0008]

FIG. 3 is a perspective view showing a state in which a plate is fitted into a shackle main body in one embodiment, and FIG. 4 is a front view of the shackle main body. Reference numeral 40 denotes a shackle body having a U-shaped outer shape formed of a rod-shaped body having a circular cross section.
8, 74 (see FIG. 6). As a material of the shackle body 40, SUP-9 made of spring steel was used.

The shackle body 40 includes a pair of straight portions 40a, 40a parallel to each other, and a curved connecting portion 40b connecting the base ends of the straight portions 40a, 40a.
A serration 44a having an axial groove as a circumferential rotation preventing portion is formed on the connecting portion side of the straight portion 40a,
At the end of the serration 44a on the connecting portion side, a step 46 having a large diameter on the connecting portion side is formed. A screw portion 48 having a smaller diameter than the straight portion is provided at the tip of the straight portion 40a, and a serration 44b having an axial groove as a circumferential rotation preventing portion is also formed at a position on the straight portion side of the screw portion 48. I have.

The plate includes two types, 42a and 42b. One plate 42a is fitted into serrations 44a of the linear portion 40a, and has serrated holes so that rotation in the circumferential direction is prevented by the serrations 44a and positioning in the axial direction is performed by the steps 46. The other plate 42b is fitted into the serration 44b of the screw portion 48, and the serration 44b
The rotation in the circumferential direction is prevented by the
It has a serrated hole so that the movement in the axial direction can be prevented by the step 50 at the boundary between the straight line portion 40a. The plates 42a and 42b are used in pairs and sandwich the rubber bush 68 or 74 therebetween.

The diameter of the bar of the connecting portion 40b is larger than the diameter of the bar of the straight portion 40a, and therefore, a step 46 is formed at the boundary between the connecting portion 40b and the straight portion 40a. The plate 42a is positioned in the axial direction by being pressed against the step 46.

FIG. 5 shows a state in which one end of a leaf spring is swingably attached to the frame 62 using the shackle. FIG. 6 is a sectional view taken along the line XX 'in FIG. It is shown. One straight portion 40 a of the shackle 60 is rotatably attached to the frame 62. In this state, the linear portion 40a is passed through a boss 66 formed integrally with the bracket 64 of the frame 62, and rubber bushes 68, 68 divided into two parts from both sides of the boss 66 are press-fitted.
Plates 42a and 42b are arranged outside 8, 68,
A screw 70 is screwed into the screw portion 48 from outside the plate 42b. At this time, the plate 42a is positioned by being pressed against the step 46, and the serration 4
4a meshes with the serrations formed in the holes of the plate 42a, so that rotation in the circumferential direction is prevented. Similarly, the other plate 42b is prevented from rotating in the circumferential direction by the engagement between the serrations 44b and the serrations formed in the holes of the plate 42b. By screwing the screw 70 into the screw portion 48, the rubber bush 6
8 and 68 are pressed and sandwiched by the plates 42a and 42b, and the rubber bushes 68 and 68 are in close contact with the straight portion 40a of the shackle and the outside is in close contact with the boss 66. Thus, the linear portion 40
a is rotatably supported by the elastic deformation of the pushes 68, 68.

The leaf spring 71 is formed by stacking a plurality of spring plates. Both ends of the first spring plate 71-1 are bent to form a ring for attaching to a frame or a shackle. Both ends of the second spring plate 71-2 are bent so as to cover the ring at the end of the first spring plate 71-1. If the first spring plate 71-1 is broken, But the second spring plate 7
The axle can be supported by 1-2.

In order to rotatably attach one end of the leaf spring 71 to another linear portion 40a of the shackle 60, the linear portion 40a is passed through a ring at the end of the first spring plate 71-1. Rubber bushes 74, 74 split into two from both sides of the hole of the ring are press-fitted, plates 42 a and 42 b are arranged outside the rubber bushes 74, 74, and a screw 76 is screwed into the screw portion 48. Also in this mounting structure, the plate 42a is positioned by being pressed against the step 46, and the serrations 44a and the serrations formed in the holes of the plate 42a mesh with each other, so that rotation in the circumferential direction is prevented,
The other plate 42b is prevented from rotating in the circumferential direction by the engagement between the serrations 44b and the serrations formed in the holes of the plate 42b. Screw 76 to screw part 48
The rubber bushings 74, 74 are
2a and 42b, the rubber bushes 74, 74 are in close contact with the straight portion 40a of the shackle, and the outside is in the state of the first spring plate 71-.
1 is in close contact with the ring at the end.

The ring at the end of the first spring plate 71-1 is rotatably supported on the linear portion 40a by the elastic deformation of the pushes 74,74. Although not shown in the figure,
The other end of the leaf spring 71 is supported rotatably with respect to the frame 62 similarly to a conventional suspension.

In the suspension equipped with the leaf spring 71 using the shackle 60 of this embodiment, when traveling on an uneven road, the displacement in the direction in which the distance between the open ends changes due to the curved connecting portion 40b, Connecting part 40
b in the torsional direction, and the linear portions 40a, 40b
Can keep the parallelism and displace in the opposite direction, and absorb the fluctuation due to the unevenness of the road with a large degree of freedom due to the lateral displacement (the leaf spring 71 moves parallel to the frame 62).

The leaf spring 71 is mounted symmetrically on the left and right sides of the vehicle body at the front wheel, the rear wheel, or both. As shown in FIG. 6 (inside) and (outside) in FIG. 6, the shackle 60 has a curved connecting portion 40a on the inside of the vehicle body, and a U-shaped open end portion facing the outside of the vehicle body. Is preferable in absorbing the displacement. However, it can be mounted in the opposite direction.

Although this shackle is excellent in absorbing irregularities when traveling on uneven terrain such as mountainous areas, it has a drawback in running stability when traveling on a flat road. . Therefore, when traveling mainly on a flat road, it is preferable to increase the rigidity by closing the U-shaped tip of the shackle body. In such an embodiment, as shown in FIG.
Holes 80, 80 through which pins are passed are formed at the distal ends of the screw portions 48, 48, and a plate-like member 82 is fitted between the two screw portions 48, 48 as shown by a dashed line.
The plate 82 can be attached to the shackle by passing the retaining pins through the pins 0 and 80, respectively. By attaching such a plate 82, the straight portions 40a and 40
The rigidity with respect to the displacement that changes the interval between a is increased, and the traveling stability when traveling on a flat portion is increased.

[0019]

The shackle according to the present invention comprises a shackle body having a U-shape formed of a rod-like body, a plate fitted into the shackle body and holding a rubber bush, and a screw for fixing the plate to the shackle body. and, since to be able to deform the circular arc-shaped connecting portion of the shackle body, the leaf spring type suspend <br/> sucrose emissions of applying this, even for the change to open and close between the tip portion of the U-shaped, twisted In addition, it is easy to be displaced even in the case of lateral displacement, the degree of freedom is increased, and large irregularities are easily absorbed.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a leaf spring type suspension.

FIG. 2 is a side sectional view showing a conventional shackle.

FIG. 3 is a perspective view showing a state where a plate is fitted into a shackle main body in one embodiment.

FIG. 4 is a front view showing the shackle body of the embodiment.

FIG. 5 is a perspective view showing a state where one end of a leaf spring is attached to a frame using the shackle of the embodiment.

FIG. 6 is a cross-sectional view taken along the line X-X ′ in FIG.

[Explanation of symbols]

 40 Shackle body 42a, 42b Plate 68, 74 Rubber bush 40a Linear part 40b Connecting part 44a, 44b Serration 48 Screw part 46, 50 Step 60 Shackle 70 Screw 71 Leaf spring

Claims (3)

(57) [Claims] 1. A leaf spring type suspension,
A shackle in which one end of a leaf spring rotatably supported by a frame is rotatably supported by the frame, the shackle includes a U-shaped shackle body made of a spring steel rod, and a shackle. A plate fitted to the main body and holding the rubber bush, and a screw fixing the plate to the shackle main body are provided.The shackle main body includes a pair of linear portions parallel to each other,
A curved connecting portion connecting between the base ends of the two linear portions, a circumferential rotation preventing portion is formed on the connecting portion side of the linear portion, and the connecting portion side of the circumferential rotation preventing portion is formed. A step is formed at the end of the connecting portion having a large diameter on the side of the connecting portion, and the tip of the straight portion has a smaller diameter than the straight portion,
A screw portion into which the screw is screwed is provided, and a circumferential rotation preventing portion is also formed at a position on the linear portion side of the screw portion, and the plate is fitted into the circumferential rotation preventing portion of the linear portion. A hole for which rotation in the circumferential direction is prevented by the circumferential rotation preventing portion, and a hole in which positioning in the axial direction is performed by the step; A shackle having a hole that can be prevented from rotating in a circumferential direction by a rotation preventing portion and that can be prevented from moving in an axial direction by a boundary between the screw portion and the linear portion. 2. The shackle according to claim 1 , wherein the circumferential rotation preventing portion is a serration having an axial groove. 3. One end of the leaf spring is turned around the frame.
And the other end of the leaf spring is
A rocker that is swingably supported by the frame via a knuckle
A leaf spring suspension, The shackle is according to claim 1 or 2.
A leaf spring type suspension characterized by the following.