CN100415550C

CN100415550C - Hydraulic damper

Info

Publication number: CN100415550C
Application number: CNB021416419A
Authority: CN
Inventors: 松井优尚
Original assignee: Showa Corp
Current assignee: Hitachi Astemo Ltd
Priority date: 2002-01-10
Filing date: 2002-09-09
Publication date: 2008-09-03
Anticipated expiration: 2022-09-09
Also published as: JP3995937B2; JP2003206975A; MY135717A; CN1432490A

Abstract

The present invention provided a hydraulic damper (10). In this hydraulic shock absorber 10 having a cylindrical guide member 40 for guiding a inner periphery of the suspension spring 13, an upper dust cover 50 covering the outer periphery of the damper cylinder 11 is disposed on a tip side of the guide member 40, a lower dust cover 60 fitted to an inner peripheral side of the upper dust cover 50 through a clearance 71, air passages 44, 45 are formed in the guide member 40, a space 70 in the upper and lower covers 50, 60 communicates with a portion above and external of the guide member 40 through the air passages 44, 45.

Description

Liquid damper

Invention field

The present invention relates to a kind of liquid damper.

Background technology

Traditional as 61-230 number described a kind of liquid damper of Japanese patent application (JP-B), the flange that is used to support suspension spring wherein is housed and is used to guide the tubulose guides of the guide rod of suspension spring inner edge to be engaged on the inner peripheral of damper cylinder, with the bending that prevents the suspension spring body and with the contacting of damping cylinder periphery.

According to such liquid damper, can think that dust boot is installed in the front end of guides to cover the periphery of damping cylinder.Selectively, the dust boot of covering piston rod periphery also needs.

In liquid damper, provide under the situation of two dust boots, promptly a dust boot is installed on the suspension spring guides, described suspension spring is engaged in the damping cylinder periphery, another dust boot is installed in the periphery of piston rod, in the inner peripheral side of the first dust boot open end, the open end of another dust boot is engaged via a suitable little gap.

But, the little gap that is limited between two dust boot open ends piston rod expand against damping cylinder and compression after, deficiency is so that air flows between space and the cover external space in the cover that two dust boots are covered, and liquid damper expands and the obstacle of compression so just become.

Summary of the invention

The objective of the invention is: when install on the suspension spring guides dust boot be contained in after dust boot on the piston rod periphery meshes to each other, improve the operability of the expansion and the compression of the relative damping cylinder of piston rod, and described suspension spring is arranged on the periphery of damping cylinder.

According to the present invention, a kind of liquid damper is disclosed, comprising: the damping cylinder that is fixed to vehicular sideview; In damping cylinder, slide and be fixed to the piston rod of axletree side by piston; Be inserted in the suspension spring between damping cylinder and the piston rod by means of spring bearing up and down; Flange is housed and on the upper spring support of damping cylinder the tubulose guides of the guide rod of guiding suspension spring inner peripheral, described suspension spring is positioned at flange.

The last dust boot that covers the damping cylinder periphery is installed into the guides front.The following dust boot that is engaged on dust boot inner peripheral side via the gap is installed on the lower spring bearing at piston rod side.One gas circuit is formed on the guides vertically.Be directed to that the space is connected with the outside, top of guides by gas circuit in the cover that dust boot covered under the dust boot and piston rod side on the device.

Brief description of the drawings

The present invention also can be understood in conjunction with the accompanying drawings fully by detailed description hereinafter, and following accompanying drawing is not a limitation of the invention, and only is for the ease of explaining and understanding.

Fig. 1 is half viewgraph of cross-section according to the liquid damper of first embodiment of the invention;

Fig. 2 is the first half viewgraph of cross-section of Fig. 1;

Fig. 3 is the lower part viewgraph of cross-section of Fig. 1;

Fig. 4 has shown guides, and Fig. 4 (A) is half viewgraph of cross-section, and Fig. 4 (B) is an end view drawing, and Fig. 4 (C) is the viewgraph of cross-section along C-C line among Fig. 4 (A);

Fig. 5 has shown time dust boot, and Fig. 5 (A) is half viewgraph of cross-section, and Fig. 5 (B) is an end view drawing;

Fig. 6 is the upper cross sectional view according to the liquid damper of second embodiment of the invention;

Fig. 7 shows a guides, and Fig. 7 (A) is half viewgraph of cross-section, and Fig. 7 (B) is an end view drawing, and 7 (C) are the viewgraph of cross-section along C-C line among Fig. 7 (A).

The description of most preferred embodiment

(first embodiment) (Fig. 1 to 5)

As shown in Figures 1 to 3, for example, the liquid damper 10 that is installed between motorcycle rear axle side and the car body side constitutes as follows, promptly, the piston rod 12 that is fixed to a side is inserted in the damping cylinder 11 that is fixed to the car body side, and suspension spring 13 is placed between the periphery and piston rod 12 of damping cylinder 11.

Damping cylinder 11 integral body are equipped with car body side connecting element 14 and flange 15, and damping cylinder 11 by flange 15 from its back support upper spring support 16.Axle side connecting element 17 is installed on the piston rod 12 by lock nut 18, and piston rod 12 quilt axle side connecting elements 17 are from its back support lower spring bearing 19.Suspension spring 13 is by upper and lower spring bearing 16 and 19 and be placed between damping cylinder 11 and the piston rod 12.Selectively, 19 relative side connecting elements 17 of lower spring bearing and radially limit drainage channel 20 along face of joint.Drainage channel 20 is used for space 70 drainings in the cover in the following dust boot that hereinafter will describe 60.

Liquid damper 10 compresses in the opening of damping cylinder 11 and fixedly rod guidance 21, O type ring 22, oil sealing 23 and end plate 24, and it compresses piston 25 and be fixed on the end of piston rod 12, piston rod 12 is inserted in the damping cylinder 11 by rod guidance 21, O type ring 22 and the oil sealing 23 of damping cylinder 11, so piston rod 12 slides against damping cylinder 11 by piston 25.Piston 25 promptly is divided into upper and lower

hydraulic cavities

26A and 26B with damping cylinder 11 inner separated into two parts.Piston 25 is equipped with flow channel 27 to be communicated with two

hydraulic cavities

26A and 26B, and flow channel 27 is equipped with valve 28, and this valve 28 produces compression damping and expansion damping when the expansion of piston rod 12 and compression.Valve 28 is installed in flow channel 27 by on valve spring (describe) the osed top direction, described valve spring by valve plug 29 with its back support.Liquid damper 10 produces compression dampings by pushing valve 28 open in compression process, and the resistance of the aperture by the flow channel that limited on the valve 28 produces the expansion damping in expansion phase.

When piston rod 12 during by maximum compression, liquid damper 10 is adjusted the maximum compression stroke by engaging stop rubber 31, and stop rubber 31 is inserted in the bottom of piston rod 12 against the end face of damping cylinder 11; When piston rod 12 during by maximum swelling, liquid damper 10 is adjusted the maximum swelling stroke by engaging retracing spring 32, and the valve plug 29 of retracing spring 32 abuts against plunger 25 is placed on the rod guidance 21.

Therefore, according to liquid damper 10, the strength under shock that is brought vehicle by the road surface is absorbed by the elastic force of suspension spring 13, and liquid damper 10 adjustment expansion and compression amplitudes, and this amplitude is generated jointly by suspension spring 13 strength under shock that absorbs and the damping that is installed in valve 28 generations in the piston 25.

In addition, liquid damper 10 is as mentioned below on the guides 40, a dust boot 50 and a dust boot 60 once.

Guides 40 is engaged in damping cylinder 11 peripheries, and damping cylinder 11 is supported its back side by upper spring support 16.As shown in Figure 4, guides 40 is equipped with flange 41, and the upper end of suspension spring 13 is placed on the flange, and guides 40 is equipped with a guide rod 42 that is used to guide the inner peripheral of suspension spring 13 in its bottom.Guide rod 42 is made up of a plurality of ribs that are contained on guides 40 peripheries, and prevents that crooked the reaching of spring body of suspension spring 13 from contacting with the periphery of damping cylinder 11.

Annular binding groove 43 is installed on the front periphery of guides 40, is contained in annular tightening screw 51 fastened being installed on the annular binding groove 43 on last dust boot 50 bottoms that cover damping cylinder 11 peripheries.

On the lower spring bearing 19 on piston rod 12 next doors, following dust boot 60 is mounted with the form that is engaged on dust boot 50 inner peripherals via gap 71.As shown in Figure 5, following dust boot 60 is equipped with flange 61, and the lower end of suspension spring 13 is positioned on the flange 61, and in the following bottom of dust boot, opening portion 60A is its front end is engaged on the inner peripheral of opening portion 50A of dust boot 50 front ends via above-mentioned gap 71 in.Gap 71 reduces downwards, enters to prevent rainwater.

Therefore, according to liquid damper 10, last dust boot 50 and dust boot 60 space 70 and in the cover around damping cylinder 11 and piston rod 12, space 70 is communicated with space outerpace by suitable aperture 71 in this cover, thereby liquid damper 10 is avoided in short-term in dust and rainwater or analogue intrusion damping cylinder 11 and the piston rod 12.Selectively, in Fig. 1 and Fig. 2, label 1 expression vehicle frame (or car body side cover), the top of damping cylinder 11 is positioned in the inboard of vehicle frame 1.

In addition, guides 40 is made by synthetic resin, to form a plurality of lifting-hook shape gas circuits 44 of crossing the axial whole length of guides inner peripheral.By these gas circuits 44, guides 40 makes that space 70 is connected with the top space outerpace of guides 40 in the cover that is covered by last dust boot 50 and following dust boot 60.

According to the present invention, guides 40 is installed on the face opposite with the upper spring support 16 of flange 41 in the following manner, promptly a plurality ofly laterally radially forms to be connected with above-mentioned flute shape gas circuit 44 towards the gas circuit 45 of guides 40 upper outer for groove shape and opening.Exterior opening towards transverse concave groove shape gas circuit 45 becomes air intake 45A.Therefore, according to the present invention, the interior space 70 of the cover of dust boot 50 and following dust boot 60 is connected with the top space outerpace of guides 40 highest points by above-mentioned flute shape gas circuit 44 and transverse concave groove shape gas circuit 45 in the covering.

Selectively, according to the present invention, guides 40 can be equipped with a groove shape gas circuit, or the hole shape gas circuit of opening space 70 in cover also can be installed in the lower end vertically at least, this gas circuit can enter the mouth and the top space outerpace of connection guides 40 from groove shape or hole shape, and above-mentioned inlet is positioned at the guide rod 42 of guides 40.

Selectively, the last dust boot 50 of being installed on the guides 40 is made by rubber, and following dust boot 60 is made by synthetic resin, and except the flange section of dust boot 60 down, a plurality of ribs 62 cross the whole length of guides 40 peripheries and are provided with.

The present invention has following effect.

(1) on the inner peripheral of tubulose guides 40, comprise that the flute shape gas circuit 44 of a plurality of flutes forms vertically, by gas circuit 44, be communicated with the top space outerpace of guidess 40 by space 70 in the cover of

last dust boot

50 and 60 coverings of following dust boot.Therefore, be different from the gap 71 between

dust boot

50 and 60, as by the gas channel between space 70 and the space outerpace in

dust boot

50 and 60 covers that covered, flow channel ensured, expands and the operability of compression against damping cylinder 11 so might improve piston rod 12.

(2) because gas circuit runs through the flute shape gas circuit 44 that axially forms along guides 40 inner peripherals, damping cylinder 11 from all genesis by air cooling.Therefore, because the temperature traverse of power fluid, counteraction reduces, so the operation of liquid damper 10 becomes stable.

(3) flange 41 monolithic molding on guides 40 of support suspension spring 13, the transverse concave groove shape gas circuit 45 that comprises a plurality of transverse concave grooves is formed on the flange 41, gas circuit 45 is radially driveed to the outside, then might with air intake 45A as much as possible from ground to upward to be arranged on the cover in space 70.Therefore, might reduce when vehicle on the way travels, produced as the counteraction of dust or analogue to bumper 10.Selectively, when above damping cylinder 11, being positioned in vehicle frame 1 inboard, can further reduce as the counteraction of dust or analogue to liquid damper 10.

(4) the last dust boot 50 of guides 40 separates with guides 40, and upward dust boot 50 is fastened on the guides 40.Therefore, even the whole length of liquid damper 10 changes owing to the model of vehicle, last dust boot 50 can be with last dust boot 50 replacements of different length.

(5) under the situation that dust boot 50 is made by rubber on the guides 40, last dust boot 50 is easy to contact with following dust boot 60 each other.But,, might prevent that two dust boots 50 from contacting fully with 60 by providing a plurality of ribs 62 at the following periphery upper edge piston rod 12 of dust boot 60.

(second embodiment) (Fig. 6 and 7)

According to Fig. 6 and the 7 second shown embodiment, liquid damper 10 is different from first embodiment shown according to Fig. 1 to 5, is integrally molded on the guides 40 because go up dust boot 50.

Guides 40 constitutes as shown in Figure 7.Guides 40 is equipped with flange 41, guide rod 42, flute type gas circuit 44 and transverse concave groove type gas circuit 45, and in addition, guides 40 also is equipped with and becomes dust boot 50 on the single-piece with its front end.The external diameter of last dust boot 50 is made into to equate with guide rod 42, so the inner peripheral of suspension spring 13 also can be directed along the external diameter of last dust boot 50.

In this case, guides 40 can be made by synthetic resin with last dust boot 50 integral body, or guides 40 can be made by rubber with last dust boot 50 integral body.In addition, guides 40 these sides can be made by thermoset synthetic resin, and last dust boot 50 those sides can be made by themoplasticity synthetic resin, so guides 40 and last dust boot 50 integral body are molded as by two kinds of colors.

Just as mentioned before, embodiments of the invention are described in detail in conjunction with the accompanying drawings.But ad hoc structure of the present invention is not limited to embodiment, and those Change In Designs within the scope of the present invention still are included in the present invention.

As indicated above, according to the present invention, suspension spring is contained on the damping cylinder periphery, the dust boot on being contained in the suspension spring guides be contained in dust boot on the piston rod periphery when being engaged with each other, might improve piston rod and expand and the operability of compression against damping cylinder.

Though a plurality of relatively exemplary embodiments of the present invention are illustrated and describe, those skilled in the art should be understood that above-mentioned and other various variations, deletion and interpolation that the present invention is done are all without departing from the spirit and scope of the present invention.Therefore, the present invention should not be construed as in the specific embodiment that only is limited to above to be stated, and should be understood to include all identical with the feature of claims statement or comprise mutually possible embodiment.

Claims

1. liquid damper comprises:

Be fixed to the damping cylinder of vehicular sideview;

In damping cylinder, slide and be fixed to the piston rod of axletree side by piston;

Be inserted in the suspension spring between damping cylinder and the piston rod by means of spring bearing up and down;

The tubulose guides, described tubulose guides is equipped with flange and targeting part, and described suspension spring is positioned at flange, and described targeting part guides the suspension spring inner peripheral on the upper spring support of damping cylinder;

It is characterized in that the last dust boot that covers the damping cylinder periphery is installed in the guides front;

The following dust boot that is engaged on dust boot inner peripheral side via the gap is installed on the lower spring bearing at piston rod side;

One gas circuit is formed on the guides vertically;

Be directed to that the space is connected with the outside, top of guides by gas circuit in the cover that dust boot covered under the dust boot and piston rod side on the device;

Open to the exterior gas circuit in guides top and radially form, and be connected with gas circuit on being formed on flange upper spring support opposing face vertically.

2. liquid damper as claimed in claim 1 is characterized in that,

Guides is made by synthetic resin.

3. liquid damper as claimed in claim 1 or 2 is characterized in that, the last dust boot that is installed on the guides is formed to such an extent that be separated with guides, and upward dust boot is fixed on the guides.

4. liquid damper as claimed in claim 1 or 2 is characterized in that, the last dust boot that installs on the guides is made by rubber, and the following dust boot on the piston rod is made by synthetic resin, and a plurality of rib is installed in down on the periphery of dust boot.

5. liquid damper as claimed in claim 1 is characterized in that, last dust boot and guides are Unitarily molded to form.

6. liquid damper as claimed in claim 1 is characterized in that, the external diameter of last dust boot is made into to equate with the guide rod external diameter of guides.

7. liquid damper as claimed in claim 3 is characterized in that, the last dust boot that installs on the guides is made by rubber, and the following dust boot on the piston rod is made by synthetic resin, and a plurality of rib is installed in down on the periphery of dust boot.