JPH074355Y2 - Hydraulic shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a hydraulic shock absorber suitable for use with a front fork or the like that is interposed between a vehicle body and an axle of a motorcycle to damp vibrations from the road surface.

[Prior Art] As a hydraulic shock absorber suitable for use with a conventional front fork of this type, for example, one having a structure shown in FIG. 3 has been developed.

In this, an upper portion of an inner tube 2 which is a wheel side tube connected to a wheel side is slidably inserted into an outer tube 1 which is a vehicle body side tube connected to a vehicle body side.

A damper cylinder 3 is erected upward from the center of the lower bottom of the inner tube 2, and a piston rod 5 is movably inserted into the damper cylinder 3 via a piston 4 having a built-in damping force generating mechanism.

A spring seat 6 is fitted on the upper part of the damper cylinder 3, and a suspension spring 7 is interposed between the upper surface of the spring seat 6 and a spring seat (not shown) provided on the cap side that closes the upper end of the outer tube 1. The suspension tube 7 always urges the outer tube 1 in the extending direction.

The upper end of the damper cylinder 3 is closed by an oil lock case 8 which also serves as a cap and is attached by screwing the base end, and the spring seat 6 is fitted to the upper end of the oil lock case 8.

A nut 10 and a holder 11 that are screwed into each other by sandwiching a stopper ring 9 that is fitted on the outer periphery of the piston rod 5 are held and attached to the upper outer periphery of the piston rod 5, and the nut is attached to the outer periphery of the holder 11. An oil hole rod 13 is fitted and held by being sandwiched between 10 and a lower end flange portion 12 of the holder 11.

Thus, when the front fork reaches the vicinity of the time of maximum compression, the oil hole rod 13 on the piston rod 5 side fits into the oil lock case 8 on the damper cylinder 3 side, and the oil in the oil lock case 8 is transferred to the oil hole rod 13 The shock is exerted at the time of maximum compression operation by discharging while applying throttling resistance from an annular fitting gap between the oil lock case 8 and the oil lock case 8.

[Problems to be solved by the invention] However, in the above-described conventional hydraulic shock absorber, when changing the starting position or the operating stroke at the time of oil lock according to the driver's preference, etc. Since the length of the fitting portion is changed or the length of the oil hole rod 14 is changed, the oil lock case 8 and the oil hole rod 13 having different lengths are prepared. It is necessary and extremely troublesome.

Further, especially when the oil lock case 8 is replaced, the damper device is also disassembled, which requires a great number of working steps.

Therefore, the present invention uses a front fork or the like that can change the starting position and the operating stroke at the time of oil lock according to the driver's preference without preparing an oil lock case or an oil hole rod having different lengths. It aims at providing the new hydraulic shock absorber suitable for.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the present invention is such that a wheel side tube is slidably inserted into a vehicle body side tube, and the wheel side tube moves upward from the center of the lower bottom. Facing the upper end of the damper cylinder with a hollow oil lock case, the piston rod is movably inserted into the damper cylinder via the piston, while the stopper ring is fitted on the upper outer periphery of the piston rod. In a hydraulic shock absorber in which a nut and a holder that are fixed by screwing them together with a stopper ring sandwiched are attached, and an oil hole rod is fitted and held on the outer circumference of the holder, multiple grooves are provided on the outer circumference of the piston rod. The position of the oil hole rod can be changed in the axial direction of the piston rod by selectively fitting a stopper ring into any one of the grooves. And are characterized by.

[Operation] That is, by selectively fitting the stopper ring to any one of the plurality of grooves provided on the outer periphery of the piston rod, the mounting position of the oil hole rod with respect to the piston rod is changed to prevent the oil lock from occurring. It will be possible to change the starting position and the working stroke.

[Embodiment] A hydraulic shock absorber suitable for use in a front fork or the like according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a hydraulic shock absorber suitable for use in a front fork or the like according to the present invention is a wheel connected to a wheel side in an outer tube 1 which is a vehicle body side tube connected to a vehicle body side. The upper part of the inner tube 2, which is a side tube, is slidably inserted, the damper cylinder 3 is erected upward from the center of the lower bottom of the inner tube 2, and a hollow piston rod is inserted in the damper cylinder 3 via a piston 4. 5 is movably inserted.

A spring seat 6 is fitted on the upper part of the damper cylinder 3, and a suspension spring 7 is interposed between the upper surface of the spring seat 6 and a spring seat (not shown) provided on the cap side that closes the upper end of the outer tube 1. The suspension tube 7 always urges the outer tube 1 in the extending direction.

A bearing 14, a seat 15 and a dust seal 16 are respectively provided on the lower inner circumference of the outer tube 1, and the bearing 14 and a bearing 17 provided on the upper outer circumference of the inner tube 2 hold the inner tube 2 slidably, Moreover, the sliding portion is sealed by the seal 15 and the dust seal 16.

The upper end of the damper cylinder 3 is closed by an oil lock case 8 which also serves as a cap and is attached by screwing the base end, and the spring seat 6 is fitted on the upper end of the oil lock case 8.

A nut 10 and a holder 11 that are screwed into each other by sandwiching a stopper ring 9 that is fitted on the outer periphery of the piston rod 5 are held and attached to the upper outer periphery of the piston rod 5, and the nut is attached to the outer periphery of the holder 11. An oil hole rod 13 is fitted and held by being sandwiched between 10 and a lower end flange portion 12 of the holder 11.

As shown in detail in the enlarged view of FIG. 2, a plurality of grooves a, b, c, d are provided on the outer circumference of the piston rod 5, and any one of these grooves a, b, c, d is provided. The stopper ring 9 can be selectively fitted to the.

Notches 8a and 11a provided in the upper end of the oil lock case 8 and the lower end flange portion 12 of the holder 11 in the figure are screwed with the oil lock case 8 to the damper cylinder 3 and the holder 11 to the nut 9, respectively. It is a notch for hooking the tightening tool.

Thus, when the front fork reaches the vicinity of the time of maximum compression, the oil hole rod 13 on the piston rod 5 side fits into the oil lock case 8 on the damper cylinder 3 side, and the oil in the oil lock case 8 is transferred to the oil hole rod 13 The impact at the time of maximum compression operation is alleviated by discharging while providing throttling resistance from the annular fitting gap between the oil lock case 8 and the oil lock case 8.

At that time, in the illustrated embodiment, the stopper ring 9 is shown fitted in the groove a, but the stopper ring 9 is fitted in one of the other grooves b, c or d of the piston rod 5. By changing it, it is possible to change the starting position and the operating stroke when the oil is locked.

In the present embodiment, the inverted front fork in which the outer tube 1 is connected to the vehicle body side and the inner tube 2 is connected to the wheel side is illustrated. It goes without saying that the same can be applied to.

[Advantage of Invention] As described above, according to the present invention, the position of the oil hole rod can be adjusted by selectively fitting the stopper ring into any one of the plurality of grooves provided on the outer circumference of the piston rod. By making it possible to change in the axial direction of the piston rod, it is possible to change the starting position and operating stroke at the time of oil lock according to the driver's preference simply by fitting the stopper ring into each groove. There is an advantage that it is not necessary to prepare an oil lock case and an oil hole rod having different lengths.

Further, according to the present invention, it is possible to change the starting position and operating stroke at the time of oil lock desired by the driver only by changing the fitting position of the stopper ring and the groove. There is also an advantage that workability can be improved without having to replace the case.

[Brief description of drawings]

1 is a partially longitudinal front view of a hydraulic shock absorber according to an embodiment of the present invention, FIG. 2 is a partially enlarged vertical front view of FIG. 1, and FIG. 3 is a partial view showing a conventional hydraulic shock absorber. FIG. [Explanation of Codes] 1 ... Body side tube, 2 ... Wheel side tube, 3 ... Damper cylinder, 4 ... Piston, 5 ... Piston rod, 8 ...
Oil lock case, 9 ... Stopper ring, 10 ... Nut, 11 ... Holder, 13 ... Oil hole rod, a, b, c, d ... Groove.

Claims (1)

[Scope of utility model registration request] 1. A wheel cylinder is slidably inserted in a vehicle body tube, and a damper cylinder having a hollow oil lock case is erected from the center of the lower bottom of the wheel tube to the upper side, and the damper cylinder is erected. While the piston rod is movably inserted into the cylinder via the piston, a stopper ring is fitted to the upper outer periphery of the piston rod, and the nut and holder fixed by screwing them together with the stopper ring are attached. Moreover, in a hydraulic shock absorber in which an oil hole rod is fitted and held on the outer circumference of the holder, a plurality of grooves are provided on the outer circumference of the piston rod, and a stopper ring is selectively fitted to any one of the grooves. This is a hydraulic shock absorber characterized in that the position of the oil hole rod can be changed in the axial direction of the piston rod.