JP2622571B2 - suspension - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a suspension suitably used, for example, as a suspension system for a vehicle.

[Conventional technology]

FIG. 6 shows an air suspension as an example of a conventional suspension.

In the figure, 1 indicates an outer cylinder constituting a shock absorber main body,
An inner cylinder 2 is provided coaxially within the outer cylinder 1, and the upper end of the outer cylinder 1 is covered with a rod guide 3 and a cap 4, and the lower end is covered with a base cap (not shown). I have. Reference numeral 5 denotes a piston rod projecting upward from the inner cylinder 2 via a rod guide 3 or the like, and a lower end of the piston rod 5 is slidably inserted into the inner cylinder 2 (not shown). It is stuck to. The protruding end side of the piston rod 5 is attached to an attachment mount 16 or the like described later via a nut 6 or the like, so that the piston rod 5 expands and contracts from the outer cylinder 1 in response to vibration of the vehicle or the like.

Reference numeral 7 denotes a shell fixed to the protruding end side of the piston rod 5 via a nut 6 and the like. Reference numeral 8 denotes a cylindrical member fixed to the outer peripheral side of the intermediate portion of the outer cylinder 1. The inner peripheral side and the outer peripheral side of the rubber 9 are hermetically fixed to the lower end side of the shell 7, respectively, whereby an air chamber 10 is formed between the outer cylinder 1 and the protruding end side of the piston rod 5. Compressed air is supplied and exhausted from the outside into the air chamber 10 via a supply / exhaust valve 11, whereby the air chamber 10 operates as an air spring and constantly urges the piston rod 5 to the extension side. It has become.

Reference numeral 12 denotes a height sensor which is located in the air chamber 10 and is fixed to the shell 7. A plurality of reed switches (not shown) are arranged on the height sensor 12 at predetermined intervals above and below. Each reed switch is turned on and off by a magnet 13 attached to the upper end of the tubular member 8. That is, when the shell 7 moves up and down with respect to the outer cylinder 1 together with the piston rod 5, the height sensor 12 approaches the magnet 13 to turn on and off each reed switch.
The vehicle height detection signal is sequentially output from the lead wire 14.

Reference numeral 15 denotes a mounting bracket provided on the lower end side of the outer cylinder 1. The mounting bracket 15 fixes the outer cylinder 1 to the axle side (not shown) of the vehicle.

Further, reference numeral 16 denotes a mounting mount provided on the protruding end side of the piston rod 5. The mounting mount 16 is formed in a disk shape and has a bearing 17 on the protruding end side of the piston rod 5.
Mounting part 16A on the piston rod 5 side fixed via
In order to cover the mounting portion 16A from above, the mounting portion 16A is formed in a disk shape with a larger diameter than the mounting portion 16A, and is formed on the vehicle body side (not shown).
Attachment 16B on the vehicle body attached to the vehicle via bolts 18 etc.
And an annular mount rubber 16C fixed between the mounting portions 16B and 16A using means such as baking and elastically supporting the piston rod 5 with respect to the vehicle body via the mounting portions 16A and 16B.
The mount rubber 16C has the same thickness over the entire circumference.

Here, the bearing 17 is fixed on the inner ring side to the protruding end side of the piston rod 5 via a nut 6 or the like, and the outer ring side is fixed on the mounting portion 16A of the mounting mount 16 by means such as welding. The bearing 17 allows the piston rod 5 to rotate relative to the vehicle body when the piston rod 5 receives a rotational force from the outer cylinder 1 or the like for a reason to be described later. At this time, the mounting mount 16 has the mounting portion 16A fixed to the outer ring side of the bearing 17,
Since the mounting portion 16B is fixed to the vehicle body side, it does not rotate. However, since the shell 17 and the like are fixed to the inner ring side together with the piston rod 5, the shell 17 and the like rotate relative to the piston rod 5 to rotate the outer cylinder 1. It can follow with the cylindrical member 8 and the rubber 9.

The air suspension of the prior art has the above-described configuration. When used on the front wheel side of a vehicle, the mounting bracket 15 is fixed to the front wheel side knuckle bracket via bolts or the like (see FIG. 1), and the mounting mount is mounted. 16 is fixed to the vehicle body or the like above the front wheels via bolts 18 or the like. By supplying and discharging compressed air into the air chamber 10, the height sensor
The vehicle height is adjusted based on the vehicle height detection signal from 12, and at this time, the air chamber 10 operates as an air spring, and constantly urges the piston rod 5 to the extension side, so that the vehicle body side with respect to the axle side. Suspend.

Also, when vibration is applied to the vehicle due to irregularities on the road surface or the like during traveling of the vehicle, the piston rod 5 expands and contracts, and the piston slides in the inner cylinder 2, and the oil in the inner cylinder 2 and the outer cylinder 3 A damping force is generated by the liquid to buffer the vibration. On the other hand, when a torque is applied to the outer cylinder 1 via the mounting bracket 15 by the steering operation on the front wheel side, the piston rod 5 is rotatable relative to the vehicle body side by the bearing 17. , The shell 7 and the like rotate together with the outer cylinder 1 to prevent an eccentric load from acting on the rubber 9 and the like.

[Problems to be solved by the invention]

By the way, in the above-mentioned prior art, since the outer cylinder 1 is mounted on the front wheel side of the vehicle via the mounting bracket 15, a moment in the direction indicated by the arrow A is applied to the outer cylinder 1 due to a tire reaction force on the front wheel side. Works. On the other hand, the protruding end side of the piston rod 5 is mounted on the vehicle body via the mounting mount 16, so that the mounting rubber 16C of the mounting mount 16 can absorb an impact load or the like, but the piston rod 5 and the outer cylinder A lateral load in the direction of the arrow B continues to be applied to the portion 1 by the moment in the direction of the arrow A via the rod guide 3 and the like.

For this reason, in the related art, the rod guide 3 comes into strong contact with the piston rod 5 due to the lateral load in the direction of the arrow B, and the piston rod 5, the rod guide 3 and the like are abnormally worn when the piston rod 5 expands and contracts. There's a problem.

The present invention has been made in view of the above-described problems of the related art, and the present invention applies a moment to a piston rod in a direction to reduce a lateral load to a piston rod by elastically deforming a mounting rubber of a mounting mount when the mounting rubber is mounted on a vehicle body. The suspension can prevent abnormal wear from occurring between the piston rod and the rod guide, and can also solve problems such as cracks in the mount rubber and improve durability. It is intended to provide.

[Means for solving the problem]

In order to solve the above-described problems, the present invention provides a shock absorber main body, a piston rod projecting upward from an upper end of the shock absorber main body, and a lower end side of the shock absorber main body, wherein the shock absorber main body is mounted on a vehicle. The present invention is applied to a suspension including a mounting bracket to be mounted on an axle side and a mounting mount for mounting a protruding end side of the piston rod to a vehicle body side of a vehicle.

The feature of the configuration adopted by the present invention is that the mounting mount is composed of a mounting portion on the piston rod side, a mounting portion on the vehicle body side, and a mount rubber disposed between the mounting portions. The rubber has a shape before being attached to the vehicle body, by forming a thicker portion on the inner side of the vehicle body and a thinner portion on the outer side of the vehicle body with the axial center of the mount rubber interposed therebetween, thereby forming the thinner portion on the vehicle body side. The mounting portion is configured to be inclined with respect to the mounting portion on the piston rod side, and further provided with a concave groove that opens downward and extends over a predetermined range in the circumferential direction below the thin portion of the mount rubber, At the time of attachment to the mount rubber, the mount rubber is attached by compressing and deforming a thick portion of the mount rubber.

[Action]

If the mounting mount is mounted on the vehicle body side in a state where the thick part side of the mount rubber is elastically compressed and deformed, a moment in the direction of reducing the lateral load in the direction of arrow B based on the tire reaction force is applied to the piston rod. This can prevent the rod guide or the like from coming into strong contact with the piston rod. Further, even if a tensile stress or the like acts on the thin-walled portion side when the thick-walled portion side of the mount rubber is strongly compressed, a concave groove is formed on the thin-walled portion side. Can be relaxed.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. In the embodiment, the same components as those in the prior art shown in FIG. 6 described above are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, 21 is a bearing on the protruding end side of the piston rod 5.
The mounting mount 21 is provided through a bearing rod 17 which is formed in a disk shape substantially in the same manner as the mounting mount 16 described in the prior art, and which is fixed to the outer ring side of the bearing 17. Mounting portion 21A, a vehicle-side mounting portion 21B formed in a disk shape having a larger diameter than the mounting portion 21A, and covering the mounting portion 21A from above, and the mounting portions 21B and 2B.
Although it is composed of an annular mount rubber 21C disposed between 1A, the mounting mount 21 is formed in an inclined state in advance as shown in FIG. 2, FIG. 4, and the like.

That is, the mounting mount 21 is attached to the mounting portion 2A with respect to the mounting portion 21A.
1B so as to tilt, the mount rubber 21C, across the axial center of the mount rubber 21C, a portion to be a vehicle body inner side when vehicle fitting the thick portion 21C _1, a portion that becomes the outside of the vehicle body and a thin portion 21C ₂ are gradually formed in uneven thickness ring made thinner toward the mount rubber 21C from the thick portion 21C ₁ to the thin portion 21C _2. Further, a plurality of bolts 22 and the like are fixed to the mounting portion 21B of the mounting mount 21, and the mounting portion 21B is
The strut tower 24 and the like, which will be described later, are fixedly connected via the second member. Then, the mount rubber 21C of the mounting mount 21 during this attachment, the thick portion 21C ₁ side is strongly compressed and deformed elastically, which is the piston rod 5 so as to act on arrow C direction moment.

Reference numeral 23 denotes a concave groove formed on the thin portion 21C ₂ side of the mount rubber 21C, and the concave groove 23 is located between the outer peripheral side of the small-diameter mounting portion 21A and the outer peripheral side of the large-diameter mounting portion 21B. Open downward, a predetermined range in the circumferential direction as shown in FIG.
It extends in an arc shape over an angle range θ of about degrees. Then, concave grooves 23 by enlarging the surface length in the radial direction of the thin portion 21C ₂ side, the mount rubber 21C thick portion 2
When is strongly compressed and deformed to 1C ₁ side to relax the tensile stress D which acts on the thin portion 21C ₂ side (see FIG. 3) in the cracks and the like is generated in the thin portion 21C ₂ side by the tensile stress D To prevent it.

Reference numeral 24 denotes a strut tower which is located on the front wheel side of the vehicle and forms a part on the vehicle body side. The protruding end side of the piston rod 5 is attached to the strut tower 24 via an attachment mount 21. 25 is a bolt for mounting bracket 15
26 shows a knuckle bracket on the axle side which is mounted via 26, 26, etc., and the knuckle bracket 25 is provided integrally with a knuckle spindle 27;
A front wheel 28 of the vehicle is rotatably mounted on the vehicle. The front wheel 28 is connected to a steering wheel (not shown) of the vehicle via a lever 29 provided integrally with the knuckle bracket 25, and the steering operation is performed by the steering wheel.

Here, the outer cylinder 1 receives a moment in the direction of arrow A shown in FIG. On the other hand, the piston rod 5 the attachment mount 21 when attached to the strut tower 24, the mount rubber 21C of the mounting mount 21 is a thick portion 21C ₁ side to the state shown in FIG. 1 from the state shown in FIG. 2 Since the piston rod 5 is elastically deformed by compression, a moment in the direction of arrow C always acts on the protruding end side of the piston rod 5. The moment in the direction of arrow C acts in a direction to offset the moment in the direction of arrow A due to the tire reaction force or the like, and the moment in the direction of arrow A causes the rod guide 3 to apply a force to the piston rod 5 in the direction of arrow B. The lateral load (see FIG. 6) is surely reduced.

The air suspension according to this embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However in this embodiment, the mount rubber 21C of the attachment mount 21, across the axial center of the mount rubber 21C, the vehicle body mounting inboard become part thick portion 21C ₁ becomes the time, the vehicle body outer portion serving thin-walled portion 21C ₂ and formed into Hen'niku ring so, when mounting the projecting end of the piston rod 5 on the vehicle body side of the strut tower 24, the mount rubber 21C
The thick portion 21C ₁ resiliently to strong compressive deformation, since the mounting portion 21B of the attachment mount 21 and the mount via a bolt 22 or the like to the strut tower 24, constantly projecting end of the piston rod 5 Arrow A moment in the direction indicated by arrow C can be applied, and a moment in the direction indicated by arrow A due to a tire reaction force or the like can be offset by the moment in the direction indicated by arrow C. The lateral load applied in the direction indicated by the arrow B can be reliably reduced.

Therefore, it is possible to prevent the rod guide 3 and the like from coming into strong contact with the piston rod 5, and to prevent the rod guide 3 and the piston rod 5 and the like from being abnormally worn due to the expansion and contraction of the piston rod 5, thereby reducing their durability. It can surely be improved.

Further, since the thin portion 21C ₂ side of the mount rubber 21C was formed over the groove 23 which is open downwardly in the circumferential direction of the predetermined range, when brought into strongly compressed deforming the thick portion 21C ₁ side of the mount rubber 21C , even if acts tensile stress D exemplified in FIG. 3 in the thin-wall portion 21C ₂ side, the tensile stress D can be alleviated by the groove 23, the recessed groove 23 according to the size of the tensile stress D now spread elastically in the radial direction of the mount rubber 21C, it is possible to prevent the cracks generated in the thin portion 21C ₂ side, the durability of the mount rubber 21C can be reliably improved.

In the above embodiment, the air suspension provided on the front wheel side of the vehicle has been described as an example. However, the present invention is not limited to this, and the rear wheel side also receives a moment in the direction of arrow A due to tire reaction force or the like. Can also be applied to the rear wheel side.

〔The invention's effect〕

As described in detail above, according to the present invention, the portion that becomes the inside of the vehicle body becomes thicker and the portion that becomes the outside of the vehicle body with the mount rubber of the mounting mount sandwiching the axial center of the mount rubber before being mounted on the vehicle body. Is formed in advance so as to be thin, the mounting portion on the vehicle body side is inclined with respect to the mounting portion on the piston rod side. A concave groove extending over a predetermined range in the direction is provided, and when the mounting mount is mounted on the vehicle body, the thick rubber portion of the mount rubber is compressed and deformed, so that the protruding end side of the piston rod is connected via the mounting mount. When mounted on the vehicle body side, the thick rubber side of the mount rubber is elastically strongly compressed and deformed, so that it is applied to the piston rod from a rod guide etc. by tire reaction force etc. Is the direction of the moment to reduce the lateral load, it is possible to always acts on the projecting end of the piston rod, the piston rod and rod guide to abnormal wear and the like can be prevented. In addition, when the thick portion of the mount rubber is largely compressed and deformed when attached to the vehicle body, the generation of tensile stress on the thin portion of the mount rubber can be mitigated by the concave groove, and cracks and the like can be formed on the thin portion of the mount rubber. Can be prevented from occurring.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part showing a state where an air suspension is mounted on a vehicle. FIG. 2 is a main part of the air suspension showing a state before mounting. FIG. 3 is an enlarged view of a main part in FIG. 2,
4 is a longitudinal sectional view of the mounting mount, FIG. 5 is a bottom view of FIG. 4, and FIG. 6 is a longitudinal sectional view of an air suspension showing the prior art. 1 ... outer cylinder, 2 ... inner cylinder, 3 ... rod guide, 5 ...
Piston rod, 7 Shell, 9 Rubber, 10
Air chamber, 15 mounting bracket, 17 bearing, 21
…… Mounting mount, 21A, 21B …… Mounting part, 21C …… Mount rubber, 21C ₁ …… Thick part, 21C ₂ …… Thin part, 23 …… Concave groove, 24 …… Strut tower, 25 …… Knuckle Bracket, 27 ... Knuckle spindle, 28 ... Front wheel.

Claims (1)

(57) [Claims] 1. A shock absorber main body, a piston rod projecting upward from an upper end of the shock absorber main body, and a mounting bracket provided on a lower end side of the shock absorber main body and mounting the shock absorber main body on an axle side of a vehicle. And a mounting mount for mounting the projecting end side of the piston rod to the vehicle body side of the vehicle, wherein the mounting mount is disposed between the piston rod side mounting portion, the vehicle body side mounting portion, and each of the mounting portions. The mount rubber is configured to have a shape before being attached to the vehicle body, a portion inside the vehicle body with the axial center of the mount rubber interposed therebetween is made thicker, and becomes a vehicle outer side. The mounting portion on the vehicle body side is inclined with respect to the mounting portion on the piston rod side by forming the portion as a thin portion. The side provided with a groove extending over a predetermined range of downwardly opening circumferentially suspension during attachment to the vehicle body, characterized in that a structure for mounting by compressive deformation of the thick portion of the mount rubber.