JP2623253B2 - Damping force adjustable hydraulic shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a damping force adjusting type hydraulic shock absorber in which a generated damping force is appropriately adjusted by a damping force adjusting actuator provided on a protruding end side of a piston rod. With regard to vessels,
The present invention relates to a damping force-adjustable hydraulic shock absorber capable of protecting a lead-out portion of an actuator.

(Prior art)

 FIG. 7 shows a conventional damping force adjusting type hydraulic shock absorber.

In the drawing, reference numeral 1 denotes a hydraulic shock absorber main body (hereinafter, referred to as main body 1), 2 denotes a piston rod projecting upward from the main body 1, and a lower end of the piston rod 2 has a piston (not shown) in the main body 1. The piston is slid into the main body 1 to generate a damping force. An insertion hole 2A is formed in the piston rod 2 in the axial direction, and the piston rod 2 is inserted in the insertion hole 2A.
An adjusting rod 3 connected to a damping force adjusting valve mechanism (not shown) is inserted through a lower end of the adjusting rod 3. The upper end of the adjustment rod 3 is connected to an actuator 8 described later, and the generated damping force is adjusted by rotating the valve mechanism.

Reference numeral 4 denotes a case for the actuator 8 fixed to the protruding end side of the piston rod 2. The case 4 is formed in a substantially disc shape, and has a bottom plate 5 fixed to the protruding end of the piston rod 2, and a covered cylinder. And a lower end of the cylindrical portion 6A is fitted to the outer periphery of the bottom plate 5 and is fixed to the bottom plate 5 by means such as caulking.
A mounting eye 7 for the vehicle body is integrally fixed to the upper surface side of the canopy 6B. A lead-out hole 6C for a later-described harness 9 is formed in the upper part of the cylindrical portion 6A of the case body 6 in the radial direction.

8 is located between the bottom plate 5 and the case body 6
The output shaft 8A protrudes downward at the center of the lower end side of the actuator 8, and the output shaft 8A extends to the upper end side of the insertion hole 2A of the piston rod 2 to adjust the damping force. It is engaged with the rod 3 so as to be integrally rotatable. The actuator 8 rotates the adjustment rod 3 to adjust the generated damping force by the valve mechanism. Reference numeral 9 denotes a harness as a lead wire for energizing the actuator 8 and the like.
The harness 9 is led out of the case 4 through a lead-out hole 6C, and the lead-out portion 9A is inserted into a pipe 10 described later,
It is connected to a power source or the like at the tip side (not shown).

Reference numeral 10 denotes an L-shaped pipe fixed to the outer peripheral surface of the case main body 6 by means such as welding at a position corresponding to the lead-out hole 6C. The pipe 10 has a horizontally extending portion 10A and a downward bent portion. Harness 9 consisting of bent portion 10B and inserted inside
Of the harness 9 is prevented from entering the case 4 along the lead-out portion 9A of the harness 9. Further, reference numeral 11 denotes a shell in which an air chamber 12 is formed around the projecting side of the piston rod 2 and the like. A supply / exhaust valve 13 for supplying / discharging compressed air from outside to the air chamber 12 is provided on the outer peripheral side of the shell 11.
Is provided, and the air chamber 12 operates as an air spring.

In the damping force adjusting type hydraulic shock absorber configured as described above,
The actuator 8 is energized from the outside via the harness 9, the valve mechanism in the main body 1 is rotated by the output shaft 8 A via the adjustment rod 3, and the generated damping force is appropriately adjusted, so that the riding comfort of the vehicle is improved. To improve.

The pipe 10 provided integrally with the case 4 protects the lead-out portion 9A of the harness 9 from flying stones and the like, and also prevents external rainwater or the like from entering the case 4 by the downward bent portion 10B. It has become.

[Problems to be solved by the invention]

However, in the above-described prior art, the cylindrical portion of the case body 6
Not only does it take time to weld the pipe 10 on the outer periphery of the 6A, but also the lead-out portion of the harness 9 inside the L-shaped pipe 10
There is a drawback that the work of inserting 9A is troublesome and the workability is poor.

In addition, since the extended portion 10A of the pipe 10 is greatly extended in the outward direction of the case 4, there is a disadvantage that the radial dimension increases and a large space must be secured on the vehicle body side.

The present invention has been made in view of the above-described drawbacks of the related art, and the present invention can improve workability during mounting by attaching a cover to a case in order to protect a lead wire lead-out portion such as a harness. Another object of the present invention is to provide a damping force-adjustable hydraulic shock absorber capable of preventing a radial dimension from increasing.

[Means for solving the problem]

In order to solve the above-described problems, the present invention provides a hydraulic shock absorber main body, a piston rod protruding outside from the hydraulic shock absorber main body, a case fixed to a protruding end side of the piston rod, A damping force-adjustable hydraulic shock absorber including a built-in and a damping force adjusting actuator whose lead wire is led out of the case, wherein a cover for covering at least a lead-out portion of the lead wire is detachably attached to the case, A guide groove is formed on the inner peripheral side of the cover so as to extend the lead-out portion of the lead wire downward along the outer peripheral side of the case.

In this case, it is preferable that the guide groove is formed in a substantially U-shape so that the lead-out portion of the lead wire is temporarily extended downward along the outer peripheral side of the case, and further extended upward.

The cover is formed in a tubular shape so as to cover an outer peripheral surface of the case, and a cover portion is provided at an upper end of the cover to partially cover an upper surface side of the case at a position corresponding to the guide groove. The configuration is good.

[Action]

According to the above configuration, the lead portion of the lead wire led out of the case from the damping force adjusting actuator is guided to extend downward along the outer peripheral side of the case by the guide groove formed on the inner peripheral side of the cover. It is possible to prevent external rainwater or the like from penetrating into the case along the lead wire lead-out portion, and to prevent the lead wire lead-out portion from largely protruding radially outward from the case. Further, since the cover is detachably attached to the case, the cover can be attached with one touch, and the lead-out portion of the lead wire can be protected from flying stones or the like by the cover.

Further, the guide groove provided on the inner peripheral side of the cover is substantially U-shaped.
By forming the lead-out portion of the lead wire downwardly along the outer peripheral side of the case,
The lead-out portion of the lead wire can be routed so as to extend further upward, and the work of leading the lead wire along the outer peripheral side of the case can be easily performed.

Further, by providing the cover with a cover that partially covers the upper surface side of the case at a position corresponding to the guide groove, the cover can be reliably positioned on the outer peripheral side of the case, and external rainwater and the like can be removed. From the upper surface side of the lead wire and along the lead-out portion can be prevented from entering the case.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6. In the embodiment, the same components as those in the prior art shown in FIG. 7 described above are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 1 to 5 show a first embodiment of the present invention.

In the figure, reference numeral 21 denotes a grommet provided in the lead-out portion 9A of the harness 9, one end of the grommet 21 is engaged with the lead-out hole 6C of the case main body 6, and the other end is the case 4 together with the lead-out portion 9A.
It extends outside. The grommet 21 is formed of, for example, an elastic material such as rubber, and protects the lead-out portion 9A of the harness 9 so as to be elastically deformable. The lead-out portion 9A may be rapidly bent by a cover 22 or the like described later. Is to be prevented.

Reference numeral 22 denotes a cover detachably fitted to the outer peripheral side of the case main body 6 from above, and the cover 22 is formed in a cylindrical shape with a resin material or the like, and has an inner diameter of the cylindrical portion 6A of the case main body 6.
A tubular portion 22A corresponding to the outer diameter, and a forked protruding portion 22B, 22C that is provided to project radially outward from the tubular portion 22A and extends in the axial direction of the tubular portion 22A, The projecting portions 22B and 22C are connected to each other on the lower end side of the cover 22. The protruding portions 22B and 22C are connected to the lead-out portion 9A of the harness 9 through a guide groove 23 described later.
The upper end of the protrusion 22B is a closed end, and the lower and upper ends of the lower end of the protrusion 22B and the protrusion 22C are open ends (FIGS. 3 to 3). (See FIG. 5).

Here, a guide groove 23 formed in a substantially U-shape is provided on the inner peripheral side of the cover 22 inside the protruding portions 22B and 22C, and the guide groove 23 is a lead-out portion 9A of the harness 9. Together with the grommet 21 along the outer peripheral surface of the case body 6.
It is designed to temporarily extend downward on the B side, and further extend upward on the protruding portion 22C side to be drawn out of the cover 22 (see FIG. 2). A cover 22D partially covering the top surface of the canopy 6B of the case body 6 is provided at the upper end of the cover 22 at a position corresponding to the protrusion 22B so as to protrude radially inward. Canopy part 6 of main body 6
B, the cover 22 is positioned with respect to the case main body 6, and external rainwater or the like is protruded from the projection 22B.
The guide groove 23 is prevented from entering the guide groove 23 from the side.

The damping force adjusting type hydraulic shock absorber according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, in the present embodiment, a substantially U-shaped guide is located inside the protrusions 22B and 22C on the inner peripheral side of the substantially cylindrical cover 22 including the cylindrical portion 22A, the protrusions 22B and 22C, and the cover 22D. A groove 23 is formed, and the cover 22 is attached to the case body 6 from above the case 4.
The cover is detachably fitted to the outer peripheral side of the cover.
The projecting portions 22B and 22C of the 22 cover the grommet 21 together with the lead-out portion 9A of the harness 9 via the guide groove 23.
Attach the cover 22 to the case 4 with one touch, and install the harness 9
Can be protected, and the troublesome work of welding the pipe 10 and inserting the lead-out part 9A of the harness 9 into the pipe 10 as in the related art can be omitted. In addition to being able to greatly improve, it is possible to prevent the radial dimension from increasing, and it is possible to eliminate the need to secure a large space around the case 4 on the vehicle body side of the vehicle.

Then, the lead-out portion 9A of the harness 9 temporarily extends downward on the protruding portion 22B side by the guide groove 23 of the cover 22, then extends upward on the protruding portion 22C side and is drawn out, and the upper end of the protruding portion 22B is closed. Since it is at the end, it is possible to reliably prevent external rainwater or the like from entering the case 4 along the lead-out portion 9A of the harness 9 and to form the lead-out portion 9A with the protrusions 22B,
It can be protected by the 22C, and it is possible to prevent the flying stones and the like jumped up by the wheels from colliding with the lead-out portion 9A and causing a disconnection accident or the like.

Further, since the cover 22D of the cover 22 is locked on the upper surface of the canopy 6B of the case body 6 above the protrusion 22B, the cover 22 can be reliably positioned with respect to the case body 6, and external rainwater and the like can be prevented. Various effects can be achieved, such as being able to prevent the intrusion into the cover 22 from above the protrusion 22B.

Next, FIG. 6 shows a second embodiment of the present invention. The feature of this embodiment is that a cylindrical portion 31A of a cover 31 is provided with a protruding portion 31B extending downward, and inside the protruding portion 31B. This is because a guide groove 32 for temporarily extending the lead-out portion 9A of the harness 9 downward is formed.

That is, the cover 31 is the cover described in the first embodiment.
The protrusion 22C is removed from 22. Other than that, the cover 22 is formed in the same manner as the cover 22, and a cover 31C protrudes radially inward at the upper end.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained.
After the lead-out portion 9A of the harness 9 extends downward along the guide groove 32, it is curved in a U-shape below the protrusion 31B,
It can be pulled out upward along the outer peripheral surface of the cylindrical portion 31A.

In each of the above embodiments, the cover 22 (31) is attached to the cylindrical portion 22.
A (31A), protruding parts 22B, 22C (31B), covering part 22D (31C), etc.
22 (31) is substantially constituted only by the protrusions 22B, 22C (31B), and the protrusions 22B, 22C (31B) are detachably attached to the outer peripheral side of the case body 6 using a band or the like. Is also good. In this case, the cylindrical portion 22A (31A) and the cover portion 22D (3
1C) can be omitted.

〔The invention's effect〕

As described in detail above, according to the present invention, a cover that covers at least the lead-out portion of the lead wire is detachably attached to the case that is fixed to the projecting end side of the piston rod and has a built-in damping force adjusting actuator. Since a guide groove is formed on the peripheral side to extend the lead-out portion of the lead wire downward along the outer peripheral side of the case, the lead-out portion can be covered by the cover, so that external rainwater or the like can be formed. Can be reliably prevented from penetrating into the case along the lead-out portion of the lead wire. Further, the lead portion of the lead wire can be prevented from largely protruding radially outward from the case by the cover, and the radial dimension of the hydraulic shock absorber can be reduced. In addition, since the cover is detachably attached to the case, the cover can be attached with one touch, so that the workability at the time of attachment can be improved, and the lead portion of the lead wire can be protected by the cover. In addition, it is possible to reliably prevent a stepping stone or the like from colliding with a lead-out portion of the lead wire and breaking.

Further, the guide groove provided on the inner peripheral side of the cover is substantially U-shaped.
By forming the lead-out portion of the lead wire downwardly along the outer peripheral side of the case,
The lead-out portion of the lead wire can be routed so as to extend further upward, so that the lead-out portion can be easily routed, and the lead-out portion of the lead wire can be more reliably protected by the cover. it can.

Further, the cover is formed in a tubular shape so as to cover an outer peripheral surface of the case, and the cover is provided with a cover portion that partially covers an upper surface side of the case at a position corresponding to the guide groove, whereby the cover is provided. Can be easily positioned on the outer periphery of the case, and the workability when attaching the cover to the case can be reliably improved, and external rainwater or the like penetrates into the case from the top surface of the case through the lead wire lead-out part. Is reliably prevented by the cover.

[Brief description of the drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a hydraulic shock absorber, FIG. 2 is a right side view of FIG. 1, and FIG. Fig. 4 is a perspective view of the cover shown in Fig. 2, Fig. 4 is a plan view of the cover shown in Fig. 3, Fig. 5 is a bottom view of the cover shown in Fig. 3, and Fig. 6 is a cover of the cover showing the second embodiment. FIG. 7 is a longitudinal sectional view of a main part of a hydraulic shock absorber showing a conventional technique. 1 ... Hydraulic shock absorber main body, 2 ... Piston rod, 3 ...
Adjusting rod, 4 ... Case, 5 ... Bottom plate, 6 ... Case body, 6C ... Lead-out hole, 7 ... Mounting eye, 8 ... Actuator for adjusting damping force, 9 ... Harness, 9A ... Lead-out part , 21 …… Grommet, 22,31 …… Cover, 22A, 31A ……
Cylindrical part, 22B, 22C, 31B ... Projecting part, 22D, 31C ... Cover part, 2
3,32 …… Guide groove.

Claims (3)

(57) [Claims] 1. A hydraulic shock absorber main body, a piston rod protruding outside from the hydraulic shock absorber main body, a case fixed to a protruding end side of the piston rod, and built in the case,
In a damping force adjustment type hydraulic shock absorber comprising a lead wire and a damping force adjustment actuator led out of the case,
A cover that covers at least the lead-out portion of the lead wire is detachably attached to the case, and a guide groove that extends the lead-out portion of the lead wire downward along the outer peripheral side of the case is provided on the inner peripheral side of the cover. A damping force adjustable hydraulic shock absorber characterized by being formed. 2. The guide groove is formed in a substantially U-shape such that the lead-out portion of the lead wire extends once downward along the outer peripheral side of the case, and further extends upward. (1) The damping force adjustable hydraulic shock absorber according to (1). 3. The cover is formed in a cylindrical shape so as to cover an outer peripheral surface of the case, and a cover portion that partially covers an upper surface side of the case at a position corresponding to the guide groove at an upper end of the cover. Claims provided (1) or (2)
The damping force adjustable hydraulic shock absorber according to the above item.