JPS6221448Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shackle for a leaf spring suspension system used in vehicles such as automobiles.

The conventional leaf spring type suspension system is disclosed in Japanese Utility Model Application Publication No. 54-26221 and Japanese Utility Model Application Publication No. 55-
As disclosed in Japanese Patent No. 163208, an upper boss c is connected to a bracket b attached to a frame a by welding f (FIG. 1). In this conventional example,
Press-fitting and fixing a highly rigid rubber butt with inner and outer cylinders or a highly rigid rubber butt with an inner cylinder before welding the upper boss c to the bracket b prevents heat generated when welding the upper boss c to the bracket b. It is impossible to carry out this method because the rubber bush will melt. Furthermore, even if upper boss c is fixed to bracket b by means other than welding to prevent the rubber butts from being heated during fixation, the rubber butts will melt due to the heat generated during drying after painting frame a, and in this case, too, It's impossible.

Conventionally, as shown in FIG. 1, it has been common practice to press-fit and fix the rubber bushings d and d, which are divided into two parts, into the upper boss c during the on-line assembly process. However, when pressing the rubber butts d, d into the upper boss c during the assembly process, it is not possible to perform a strong press fit, and the amount of compression of the rubber in the rubber butts d, d is small, resulting in an increase in the thickness of the rubber. I don't get it. For this reason, the rigidity of the rubber bushes d, d against the swinging motion of the shaft in the direction P--P in FIG. 1 is reduced, resulting in a problem of poor handling stability. Note that e and e are shell plates.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a shaft which can save the rubber material of the rubber bushing and which can be easily press-fitted into the upper boss of the rubber bushing.

In order to achieve the above object, the present invention, as exemplified in the illustrated embodiment, connects the upper boss 1 and the shaft plates 2, 2 together, and provides at least an internal rigidity at each end of the upper boss 1. Tube 3,
A space K is formed in the center of the interior of the upper boss 1 by press-fitting the rubber bushes 4, 4 with the rubber bushes 3, and forming the inner ends of both rigid inner cylinders 3, 3 to protrude inwardly from the rubber bushes 4, 4. It is characterized by the formation of

The present invention will be explained in detail below based on embodiments shown in the drawings.

In the embodiment shown in FIGS. 2 and 3, 5 is a leaf spring, 6 is an axle, 7 is a U bolt,
8, 8... are clip bands, 9 is a front bracket, 10 is a rear bracket, and 11 is a frame. Mounting pin 12 on front bracket 9
The front end spring eye 13 of the leaf spring 5 is supported via the front end spring eye 13 of the leaf spring 5. On the other hand, a shackle A is attached to the rear bracket 10, and the rear end spring eye 14 of the leaf spring 5 is supported by the shackle A.

The shackle A consists of a pair of left and right shackle plates 2, 2 integrally joined to an upper boss 1 by welding 15, 15, and a pair of left and right shackle plates 2, 2 having a metal outer cylinder 16 and a metal inner cylinder 3. Rubber bushes 4, 4 are press-fitted into both ends of the upper boss 1 to be fixed.

It is preferable that the metal outer cylinder 16 and the rubber bush main body 4a have a length of about 1/3 of the length of the upper boss 1, while the metal inner cylinder 3 has a length of about 1/3 of the length of the upper boss 1. Formed longer than 2. When the left and right pair of rubber butts 4, 4 are press-fitted into both ends of the upper boss 1, the inner ends of the metal inner cylinders 3, 3 abut at the center of the upper boss 1, while the left and right rubber butt bodies 4a and the metal outer A space K of about 1/3 of the length of the upper boss 1 is formed between the tubes 16. The above-mentioned press-fitting can be carried out by setting the fitting dimensions of the inner and outer diameters of the upper boss 1 and the metal outer cylinder 16 to appropriate values and press-fitting them, but it may also be press-fitting using serrations or the like. Further, the rubber bushing 4 having the metal outer cylinder 16 and the metal inner cylinder 3 can be provided with a highly compressible rubber bush main body 4a by a non-adhesive press-fitting method for the inner and outer cylinders, but the manufacturing method thereof is as follows. It is not limited to this.

The shaft A is attached to both side walls 2 of the rear bracket 10.
It is attached to the rear bracket 10 by a mounting bolt 18 that passes through the shaft support holes 17, 17 provided at 0, 20 and the metal inner cylinders 3, 3, and a nut 19 that is screwed into the mounting bolt 18. At this time, the metal inner cylinders 3, 3 are clamped and held by both side walls 20, 20 of the rear bracket 10, and are attached to the rear bracket 10 in a non-rotatable state.
In addition, in order to ensure that the metal inner cylinders 3, 3 are maintained in an unrotatable state, a rotation preventing means may be provided.

A mounting bolt 22 and a nut 23 screwed into the mounting bolt 22 are mounted in the shaft support holes 21, 21 provided at opposing positions in the lower portions of the left and right shaft plates 2, 2. The rear end spring eye 14 of the leaf spring 5 is supported by the mounting bolt 22 and the rubber bushes 24, 24 fitted onto the mounting bolt 22.

In FIG. 3, 25 and 26 are spring washers.

The embodiment shown in FIG. 4 is similar to the embodiment described above, except that a pair of left and right rubber bushes 4, 4 having only metal inner cylinders 3, 3 are press-fitted and fixed to both ends of the upper boss 1. It is composed of In this embodiment, each rubber bush main body 4a, 4a is supported by a metal inner cylinder 3 on its inner surface, and only a pair of shaft plates 2, 2 are connected to the upper boss 1. Since it is easy to handle when press-fitting, the rubber bush 4,
4 can be press-fitted into both ends of the upper boss 1 while the rubber is highly compressed. In this embodiment, since the outer cylinder is omitted, material cost and weight can be reduced.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, as a means for integrally joining the upper boss 1 and the shackle plates 2, 2, in addition to welding, other means such as press fitting may be employed. Also, instead of the metal inner cylinder 3,
Inner cylinder 3 made of other rigid materials may also be used.

Since the present invention has the above configuration, it has the following functions and effects.

Since the highly compressible rubber bush main body can be interposed between both ends of the upper boss and the rigid inner cylinder, the rigidity of the rubber bush against the swinging of the shackle plate in the direction P-P in Fig. 3 is increased. It is possible to improve handling stability.

When the shaft plate swings in the direction P--P in FIG. 3, stress S as shown in FIG. 5 is generated in the rigid inner cylinder and, by extension, in its support shaft (attachment bolt). The integral value of this stress corresponds to the moment that causes the shaft plate to swing, but in order to reduce the swing, it is effective to increase the swing resistance at both ends, as is clear from Figure 5. It is true. In the present invention, rubber butts are arranged at each end of the upper boss, and a space is formed in the center of the interior of the upper boss, so that the rubber butts have a minimum capacity that satisfies the vertical butt surface pressure. Only by using the main body, the swinging of the shaft plate can be effectively suppressed. Therefore, material costs can be reduced and the weight can be reduced.

It is difficult to press-fit a rubber bush that is axially long relative to the inner diameter of the upper boss into the upper boss. However, according to the present invention, the short rubber butts can be press-fitted from both ends of the upper boss, so the above-mentioned difficulties are solved. Furthermore, by setting the length of the upper boss in the axial direction to an appropriate value, it is easy to increase the rigidity against swinging of the shaft.

Since the shaft of the present invention can be completed as a unit before the assembly process on the assembly line, all that is required on the assembly line is to attach it to the bracket and attach the spring eye of the leaf spring to it. Therefore, the efficiency of assembly work on the assembly line can be improved, and parts management can be facilitated.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view showing a conventional example, Fig. 2 is a side view showing the state of use of the embodiment of the present invention, Fig. 3 is a partially longitudinal front view thereof, and Fig. 4 is a partially longitudinal front view of the embodiment of the present invention. FIG. 5, which is a longitudinal sectional front view showing the main part of another embodiment, is a diagram showing the distribution of stress S on the rubber butt support shaft, where the horizontal axis shows the position of the rubber butt support shaft, and the vertical axis shows the magnitude of stress. ing. 1... Upper boss, 2... Shackle plate,
3...Rigid inner cylinder, 4...Rubber butt.

Claims (1)

[Scope of utility model registration request] The upper boss and the shaft plate are integrally connected, and a rubber bushing having at least a rigid inner cylinder is press-fitted into each of both ends of the upper boss, and the inner ends of both rigid inner cylinders are inwardly from the rubber bushing. A shackle for a leaf spring type suspension system, characterized in that the upper boss is formed to protrude so that a space is formed at the center of the interior of the upper boss.