JPS5931930Y2 - Cantilever pin mounting structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a cantilever pin for mounting a shock absorber on a vehicle.

Conventionally, this type of cantilevered pin that receives high loads has a cylinder 2' welded to a mounting member 3' formed from a steel plate, in order to prevent the strength of the pin 1' from deteriorating due to welding, as shown in Figure 1. However, it has generally been the case that the inner diameter of the cylinder 2' is machined to the required dimensions, and then the pin 1' is press-fitted into the cylinder 2'.

However, in this method, the length of the cylinder 2' is long, and the inner surface of the cylinder 2' must be machined while being welded to the mounting member 3', which is very disadvantageous in terms of weight and cost. Met.

However, in a cantilever pin having such a structure, when a load W is applied in the direction of the arrow, stress is high on the side 1a' near the load point of the attachment part of the pin 1' to the attachment member 3', and on the far side 1b' has low stress, and after all, the strength of 1a' is particularly important.

Therefore, the present invention focuses on this point and eliminates the above-mentioned disadvantages.

In other words, in the present invention, when attaching a cantilevered pin that receives a load to a mounting member, a flanged inner cylinder is press-fitted to the high-stress part of the pin near the load point, and the flange is attached to the mounting member. By welding the pin directly to the mounting member in areas far from the load point and having low stress, and by tapering the pin, it is possible to attach the cantilevered pin to the mounting member in a lightweight and inexpensive manner. The numbers are as shown.

An example in which an embodiment of the present invention is applied to a rear wheel suspension system of a vehicle will be described below with reference to FIG. 2 and subsequent figures.

In FIGS. 2 to 5, 1 is a pin, 2 is an inner cylinder having a flange 2a at one end and into which the pin 1 whose inner surface is finished to the required dimensions is press-fitted, and 3 is an insertion hole 3a through which the inner cylinder 2 is inserted. and a curved plate-shaped mounting member serving as a bracket for mounting a shock absorber provided on a rear wheel of a vehicle having an insertion hole 3b through which the end of the far side 1b is inserted into the load point of the pin 1; The outer peripheral part of 2a is welded W1 to the above-mentioned member 3 after inserting the inner cylinder 2 into which the pin 1 is press-fitted into the insertion hole 3a, and the end which is away from the load point of the pin 1 and inserted into the insertion hole 3a. The portion 3b is directly welded W2 to the mounting member 3.

Therefore, in this case, since the welding point W1 is sufficiently far away from the pin 1, there is no decrease in the strength of the side 1a near the load point of the pin 1 due to the influence of the welding heat. Since the stress is also low on side 1b, the decrease in strength due to the thermal effect of direct welding can be ignored.

Further, the pin 1 is entirely or partially connected to the inner cylinder press-fit end 1a.
A taper 1C is applied so that the diameter becomes smaller as it moves away from the side 1b away from the load point, and the cross-sectional area of the weld W2 end is made smaller than the cross-sectional area of the press-fitted end of the inner cylinder, thereby reducing weight.

In the figure, 4 is the vehicle body, 5 is a shock absorber mount insulator, 6 is a rubber bush for shock absorber mount, 7 is a coil spring, 8 is a bumper rubber cover, 9 is a bumper rubber, 10 is a shock absorber, and 111 is a spring seat. , 12 is a rear suspension arm, 13 is a rear axle housing, 1
4 is a rear brake, 15 is a road wheel, 16 is a tire, and 17 is a bolt.

As mentioned above, according to the cantilevered pin mounting structure of the present invention, the inner cylinder whose inner surface has been finished to the required dimensions is press-fitted into the pin in advance, and the only work required to attach the pin to the mounting member is welding. Therefore, the process is extremely simple, and the axial length of the inner cylinder that is press-fitted into the pin only needs to be sufficient to obtain a sufficient press-fitting load, so the length of the cylinder that is required in the conventional method is significantly shorter. In addition, since the pin is tapered, there are advantages such as weight reduction and cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional cantilever pin mounting structure, Fig. 2 is a sectional view showing an example in which an embodiment of the present invention is applied to a rear wheel suspension system, and Fig. 3 shows the main parts thereof. Perspective view, Figure 4 is the 3rd
FIG. 5 is a partially enlarged perspective view and a vertical sectional view thereof. 1...Pin, 2...Inner cylinder, 2a...
...Flange, 3...Mounting member, 3a...
...Insertion hole, 1C...Taper part, Wl, W
2...Welding.

Claims (1)

[Scope of utility model registration request] In a cantilever pin for attaching a shock absorber, in which a pin is inserted into a curved plate-shaped attachment member provided at the end of a suspension arm of a vehicle and has insertion holes on both sides, and one protruding end of the pin receives a load via the shock absorber. , an inner cylinder having a flange is inserted into the insertion hole near the load point, and the outer periphery of the flange is welded to the curved plate-shaped mounting member; A cantilever type for mounting a shock absorber, in which a pin with a tapered diameter becomes smaller as it goes further away from the load point, and the end of the pin that is farther away from the load point is welded directly to the mounting member. Pin mounting structure.