JPS5924622Y2 - Hydraulic shock absorber for motorcycles - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in hydraulic shock absorbers for motorcycles.

In conventional hydraulic shock absorbers for motorcycles, an offset type (leading axle type) in which the axle mounting bracket is attached to the side of the outer circumferential surface of the outer tube.
are known.

By the way, in such conventional offset type hydraulic shock absorbers, the axle mounting bracket was directly welded to the outer circumferential surface of the outer tube in close proximity to the sliding surface, so the heat effect from welding caused damage to the inner sliding surface of the outer tube. Dimensional distortion occurs, which significantly impairs the operability of the piston, and it is also necessary to drill holes in the inner circumferential surface of the outer tube after welding, which poses problems in mass production.

Therefore, as shown in FIG. 1, an offset type was proposed in which an axle mounting bracket 1 and an oil hole rod 2 were integrally formed by forging, and were inserted into the lower end of an outer tube 3 and welded together.

However, since the buffer is a leftover item, it is heavy and has a complicated shape, resulting in poor yields and other disadvantages, which poses problems in practicality.

The present invention was developed by focusing on these conventional problems, and by installing the axle mounting bracket at a position below the oil hole rod provided in the outer tube that takes over the shock absorber body, it is possible to prevent welding. It is an object of the present invention to provide a hydraulic shock absorber for a two-wheeled vehicle that solves the above-mentioned problems by preventing the piston from sliding at the location where strain occurs due to the above-described problems.

Hereinafter, the present invention will be explained based on the drawings.

FIGS. 2 and 3 are diagrams showing a first embodiment of the present invention.

As shown, attach the axle mounting bracket 10 to the outer tube 11.
The oil hole rod 13 is directly welded to the side surface of the outer tube 11 above the welding position 12.

The outer tube and the oil hole rod 13 may be connected by seam welding, for example, or by forming an annular groove 14 on the contact outer peripheral surface of the oil hole rod 13 as shown in FIG. The ring 15 is arranged and caulked from the outside of the outer tube 11 to couple it.

Note that 21 is a mounting hole of the axle mounting bracket 10, and 25 is a fitting stepped portion of the oil hole rod 13 that fits into the inner tube 26.

As described above, even if dimensional distortion occurs due to welding of the axle mounting bracket 10, the piston 16 provided in the inner tube 26 will fit into the fitting step 25 of the oil hole rod 13, and no further stroke will be possible. Therefore, since the piston 16 does not slide to the point where the piston occurs, operability is improved, and since there is no need to perform secondary hole machining, mass productivity is also improved.

4 to 7 show a second embodiment of the present invention.

As shown in the figure, the axle mounting bracket 10 is welded to the side surface of a hollow cap 17 having approximately the same diameter as the outer circumference of the outer tube 11, and an annular stepped portion 18 is formed on the inner circumferential surface of the cap 17 on the opening side.

On the other hand, an annular stepped portion 1 is also provided on the inner peripheral surface of the rear end of the outer tube 11.
form 9.

Then, insert the oil hole rod 13 into the outer tube 11,
The rear step portion 13a of the oil hole rod 13 is fitted into the annular step portion 19.

Next, insert the annular step part 18 of the cap 17 into the protruding rear part 13a of the oil hole rod 13, and
Secure the entire circumference by welding.

At this time, it is preferable that the rear step portion 13a of the oil hole rod 13 is exposed to some extent between the annular step portions 18 and 19 to enhance the welding effect.

As described above, this embodiment has the advantage that the oil hole rod 13 can be fixed relatively easily and firmly.

Note that since the axle mounting bracket 10 is provided on a separate cap 17, the axle mounting bracket 10 can be cut to any length in advance depending on the vehicle type, and the position from the bottom of the cap 17 can be arbitrarily selected. Highly versatile.

As explained above, according to the present invention, the axle mounting bracket is installed at a position below the fitting step of the oil hole rod in the outer tube, so that even if distortion occurs due to welding, the distortion will not occur. Since the piston does not slide all the way to that point, operability is improved and there is an effect that there is no need to perform secondary hole drilling.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional device, Fig. 2 is a partially cutaway front view of an embodiment of the present invention, Fig. 3 is a detailed front view of a part of Fig. 2, and Fig. 4 is a front view of the present invention. 5 is a sectional view taken along the line AA in FIG. 4, FIG. 6 is a plan view of the main part of FIG. 4, and FIG. It is a sectional view taken along the B line. 10...Axle mounting bracket, 11...Outer tube, 13...Oil hole rod, 17...
・Shows the cap.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a hydraulic shock absorber for a two-wheeled vehicle in which the axle mounting bracket is attached to the side surface of the outer tube, the axle mounting bracket has a fitting stage between the oil hole rod provided inside the outer tube and the inner tube. A hydraulic shock absorber for a two-wheeled vehicle, characterized in that the shock absorber is located below the outer tube and is fixed to the outer tube by welding. 2. A claim for utility model registration characterized in that the axle mounting bracket is fixed to a hollow cap separate from the outer tube, and the cap is connected to a part of an oil hole rod fixed to the lower end of the outer tube. A hydraulic shock absorber for two-wheeled vehicles according to scope 1.