JPS608193Y2 - Damping force adjustment device for shock absorber - Google Patents

Description

[Detailed description of the invention] The present invention relates to a damping force adjustment device in a shock absorber, and more specifically, the orifice provided in the piston rod is made variable by external operation, thereby making it possible to switch the damping force into multiple stages. This invention relates to a damping force adjustment device for a type of shock absorber.

In this kind of conventional shock absorber, when the orifice provided in the piston rod is made variable by external operation, the piston rod is attached by forming a hole or space in the horizontal direction at the base end of the eye, and inserting the hole or space inside the hole. A small rotatable adjuster is rotatably inserted, and when the adjuster is rotated with a finger or the like, an operating rod that interlocks with the adjuster is rotated, and one of the orifices at the tip of the operating rod is selected.

However, when operating with a small adjuster like the conventional one, it is difficult to operate and lacks reliability.

For this reason, the present applicant has improved the above-mentioned adjustment device by providing a relatively large rotatable cover that interlocks with the adjuster, and by rotating this cover, the adjuster and operation iron rotate, and the damping force adjustment operation can be performed. We have developed a shock absorber damping force adjustment device that can be easily and reliably operated (Utility Application No. 132351/1982).

However, this adjustment device fixes the cover with a snap ring, but the shape of the snap ring is unique.
There was a problem that it came off easily, and since the upper bracket had a groove for attaching the snap ring, its strength decreased, and since the snap ring was exposed to the outside, it was conspicuous and deteriorated the overall appearance and design. It is.

Therefore, an object of the present invention is to provide an improved damping force adjustment device for a shock absorber in which the cover is attached so that the members do not fall off or are exposed to the outside, and the strength is maintained.

An embodiment of the present invention will be described below with reference to the drawings.

In the shock absorber A, a piston rod 3 is slidably inserted into a cylinder 1 via a piston 2, and the piston 2 defines upper and lower oil chambers 4 and 5 within the cylinder 1.

An under bracket 6 is provided at the lower end of the cylinder,
Further, an upper bracket 7 is connected to the upper end of the piston rod 3 protruding from the cylinder, and these brackets 6.
Shock absorber A is interposed between the vehicle body and the wheels of the two-wheeled vehicle via 7.

A vertical hole 8 and a horizontal hole 9 are bored in the piston rod 3 to communicate the liquid chambers 4 and 5 partitioned by the piston 2, and these two holes 8 and 9 form a fixed orifice.

The piston rod 3 protrudes from the cylinder 1 and is fixed to the base end 10 of the upper bracket 7 via a screw or the like.
An operating rod 12 is rotatably inserted into this piston rod 3 via a bearing 3a, and this rod 12
A cylindrical body 13 fixed at the tip is rotatably disposed within the vertical hole 8.

The cylindrical body 13 has a plurality of orifices 14a, which are smaller than the horizontal hole 9 and have different inner diameters, at positions facing the horizontal hole 9.
... are bored, and one of these orifices 14a ... selectively opens into the horizontal hole 9 according to the rotation of the cylindrical body 13.
As a result, the oil passing area of the horizontal hole 9 is made variable, and the damping force is adjusted in accordance with the size of the inner diameter of the orifice 14a.

The base end 10 of the upper bracket 7 is formed in a semicircular shape, and a lateral hole or space 15 is formed in the base end 10, and a mounting hole 16 is formed in the upper bracket 7 itself.
has been established.

A screw hole 17 into which the piston rod 3 is screwed, a gear support hole 18 at the end, and a detent hole are bored in the center of the base end 10.

An adjuster 19 is rotatably inserted into the hole or space 15 in the upper bracket 7, teeth 20 forming a gear are carved on the outer periphery of the adjuster 19, and an idle gear 21 is rotatably inserted into the gear hole 18. The outer peripheral teeth 22 of the idler gear 21 mesh with the teeth 20 of the adjuster 19, and a skirt-shaped cover 23 is rotatably supported on the outer side of the bracket base end 10 and the idler gear 21.
Teeth 24 carved on the inner circumference of the cover 23 rotatably mesh with teeth 22 of an idler gear 21, so that when the cover 23 is manually rotated, the adjuster 19 rotates via the idler gear 21.

A stepped hole 25 is bored in the center of the cover 23.
A support plate 28 consisting of two plates 26 and 27 is fitted inside, and a U plate inserted between these plates 26 and 27 is fitted inside.
The base end of the letter-shaped pin 29 is connected to the upper bracket base end 10.
The support plate 28 is held by fitting into the hole 30 bored in the hole 30, and the cover 23 is prevented from being removed upward by being hooked onto the stepped portion of the stepped hole 25.

The support plate 28 is connected to the plate 26 as shown in FIGS. 3 and 4.
．． A semicircular hole 31 into which the bracket base end portion 10 is inserted is bored in the center of the plate 26. A gap 33 is defined between the gaps 27 and 27.

A fixing pin 29 is inserted into this gap 33 from the lateral direction.

The protrusions 32 may be formed by bending the plate 27 as shown, or may be formed by building up the plate 27.

A horizontal or inclined display surface 23 is provided on the back of the cover 23.
33 are written at equal intervals on the display surface 23a, and unevenness 34 is provided on the outer periphery of the cover 23 to facilitate rotational operation.

The adjuster 19 and the operating rod 12 rotate twice as much as the cover 23 rotates due to the gear pitch.

Therefore, when the cover is rotated 180 degrees, the adjuster 19 rotates once.

For this reason, if the position of the reference numeral 33 is displayed in correspondence with the position of the notch hole and orifice 14a of the detent mechanism, the notch hole, orifice 14a, etc. can be opened by just turning the cover 23 half a turn. ... returns to its original position, making it possible to reduce the operating angle of the cover.

If you want to obtain damping force, this symbol 33 is the orifice 14.
Since it corresponds to a..., it can be freely adjusted from the outside by simply aligning this code 33 with the arrow 35 provided on the plate 26.

A vibration-proof cushion member 36 is disposed on the lower surface of the cover 23, and a suspension spring 3B is interposed at the lower part of the cushion member 36 via a seat 37.

39 is a cushion.

When attaching the pin 29, first the support plate 28 is fitted into the hole 25 of the cover 23, and from this state the cover 23 is lowered against the cushion member 36.

At this time, the plates 26 and 27 are stopped at their original positions by the gear 21, and since their outer ends are exposed to the outside, a pin 29 is inserted from the side of the plate 26 and 27, and the base end is attached to the base end of the bracket 10. Insert into hole 30, then cover 2
When the pressing force 3 is stopped, the cover 23 is pushed upward by the expansion of the cushion 36, and the outer ends of the support plate 28 and the pin 29 are built into the hole 25 of the cover 23 so that they are not visible from the outside.

Since the cover 23 transmits its rotational force to the operating rod 12 via the adjuster 19, the cover 23 and the adjuster 19 are connected by pins, splines, or other connecting members or interlocking elements instead of using a gear mechanism as described above. It can also be used if the cover 23 is connected via a mechanism, and when the cover 23 is rotated, the adjuster 19 is also rotated in conjunction with this.

As described above, in the damping force adjusting device of the present invention, when the reference numeral 33 is aligned with the arrow 35, the gear 21 is adjusted according to the rotation angle of the cover 23.
When the adjuster 19 rotates, the operating rod 12 and the cylindrical body 13, which are integral with the adjuster 19, rotate by the same amount, and the orifice 14a provided in the cylindrical body 13...
... is opposed to the horizontal hole 9, and a damping force corresponding to the orifice can be obtained.If it is desired to select another orifice position, the cover 23 can be rotated according to the reference numeral 33.

In this case, since the radius of the cover 23 is relatively large, manual operation is easy and reliable, and fine adjustment is possible.

Furthermore, since the pin 29 is built into the support plate 28, it is not visible from the outside, so it does not spoil the appearance or design of the shock absorber, and because it cannot be easily removed, the cover may come off or rattle. This is to prevent

[Brief explanation of the drawing]

The attached drawings relate to one embodiment of the present invention, in which FIG. 1 is a partially cutaway vertical side view of a shock absorber, and FIG.
3 is a plan view of the support plate, and FIG. 4 is a side view of FIG. 3. 3...Zeston rod, 10...Bracket base end, 12...Operation rod, 14a...
...... Orifice, 15... Space, 19... Adjuster, 20.22.24.
...Gear, 21...Idle gear, 23...
...Cover, 26.27 ...Plate, 2
8...Support plate, 29...Zen, 30...
... Hole, 33... Code, 35...
arrow.

Claims (1)

[Scope of utility model registration request] In a shock absorber in which an operating rod is rotatably inserted into the piston rod and one orifice is selected by rotating the operating rod, the base end of the bracket is fixed to the piston rod, and the base end of the bracket is fixed to the piston rod. An adjuster that interlocks with the operating rod is rotatably inserted into the lateral space provided at the end, and a cover is rotatably disposed around the outer periphery of the base end of the bracket, and the rotation of this cover is interlocked with this. The damping force of the shock absorber is such that the damping force is transmitted to the adjuster, and a support plate is interposed in the hole drilled in the center of the cover, and a stopper fitted into the support plate is held at the base end of the bracket. Adjustment device.