DE3206090A1 - HYDRAULIC SHOCK ABSORBER AND AIR SPRING UNIT - Google Patents

Description

KOFFMANN-EITLE & PÄRTNKR

PATENT LAWYERS

DR. ING. E. HOFFMANN (1930-1976). Dl PL.-Ί NG. W.E1TLE DR. RER. NAT. K. HO FFMAN N. D I PU-ING. W. LEHN

DIPL.-ING..K. FOCHSLE OR. RER. ΝΛΤ. Β. HANSEN ARABELLASTRASSE 4 (STAR HOUSE). D-8000 MD NCH EN 81 TELEPHONE (089) 911007. TELEX 05-29619 (PATH E)

36 4GT p / hl

TOKICO LTD.,

Kawasaki-shi, Kanagawa-ken / Japan

Hydraulic damper and air spring unit

The invention relates to a hydraulic Damper and air spring unit for use in. a suspension system of a vehicle with a height adjustment device. . "■■ ·" ■ - "■■

. ·

The Höheneinstellvorriehtung acts in terms of. ■ Maintaining the altitude of the vehicle, such as an automobile, at a certain level, independently from the load status "of the vehicle.

• 10 the device with air springs in the suspension system of the vehicle together / around the air pressure in the air springs to increase or decrease, in response to the load condition of the vehicle.

"The hydraulic damper and air spring unit is particular suitable for use in combination with the vehicle height adjustment system. It includes usually: a hydraulic damper with a . Cylinder, one piston working in the cylinder and one Piston rod attached to the piston, which can be moved

protrudes from one end of the cylinder; and an air spring formed by an elastic and flexible tubular Part is formed, which is attached with one end to the outer circumference of the cylinder of the hydraulic damper

OG 1st and with the other end on a substantially cup-shaped, tubular part, which is on the protruding The end of the piston rod of the hydraulic damper is attached and surrounds the piston rod, whereby the cup-shaped, tubular part and · the flexible tubular part an air chamber is formed. Such a device is shown in U.S. Patents 3,046,001 and 3,967,363.

That. upper end of the piston rod of the device is usually with the sprung mass, such as the chassis of the Vehicle, and the lower end of the cylinder with the unsprung mass, such as the wheel axle> tied together. So · foreign matorlalien, such as dirt, stones or the like .. · • accumulate on the outer circumference of the cylinder. Since the flexible tubular part usually has a first wall section which runs along the outer circumference of the cylinder runs, a second wall portion which coaxially surrounds the first wall portion and a roll wall portion which connects the two first-mentioned sections and the contact area between the first wall section and the outer circumference of the cylinder changes with the retraction and extension of the piston rod. Therefore, the Foreign materials such as dirt, stones or the like. That. have accumulated on the outer circumference of the cylinder, between the dome cylinder and the flexible tubular part are clamped, whereby damage to the flexible tubular part takes place, as this flexible tubular Part usually made of rubber or the like. Is. Furthermore, the roll wall section has the flexible tubular part a downwardly convex shape and protrudes from the first and two-tone wall section downwards, which with the cylinder

or cup-shaped, tubular part are connected. \ Drainage water often collects on the inner surface "of the roll wall section and is therefore only uohr schw.U'ir.i g ' effectively dissipate.

The object of the invention is to achieve the above To eliminate disadvantages and to create a hydraulic "damper. And air spring unit" in the event of damage avoided the flexible tubular part and easily drained water that has accumulated in the pressure chamber can be.

This object is achieved according to the invention in that a first tubular part surrounding the piston rod with a closed upper end at the upper end of the piston rod is attached, with the lower end facing downwards h.f.n opens up that a second pipe part with a larger diameter than that of the first pipe part thin ". Cylinder surrounds and with its lower closed. '20 end is attached to the cylinder, with the top end

opens in the upward direction, and that an elastic and flexible tubular part with opposite ·. th ends on the one hand on the first pipe part and on the other hand is attached to the second pipe part and thus an air ' . chamber forms, wherein the elastic tubular part has a first tubular wall section which, runs along the circumference of the first tubular part, a second tubular wall section which is coaxial runs to the first wall section and a roll wall section having, which with the first and second. Wall section is connected, this roll wall section is convex in the upward direction.

According to the invention, it is therefore possible to avoid pinching of foreign materials between the elastic,

tubular part and the rigid, cylindrical or tubular part to keep minimal and therefore damage or retention of the elastic tubular Part "to prevent". In addition, water that has accumulated in the pressure chamber can be easily drained away.

Further details, features and advantages of the invention emerge from the following description of the FIGS the drawings purely schematically illustrated embodiments. It shows: ·

Fig. 1 is an explanatory, schematic, longitudinal section sees a hydraulic damper and air · ^ spring unit according to the invention and '

Fig. 2 is an explanatory view of another embodiment of the invention.

■ In Fig. 1, a hydraulic damper is shown at 1, which consists of a cylinder 2, which is a hydraulic Fluid, contains, and a piston rod 3 consists, ' which is connected to a piston, not shown. This piston works in cylinder 2. The piston rod 3 slidably and sealedly protrudes through the top of cylinder 2. Various types of hydraulic Dampers have been proposed and are well known to those skilled in the art. That I the invention does not affect the detailed construction of the hydraulic damper refers, the related description is omitted.

The piston rod 3 has a screw thread section of reduced diameter at the protruding end. Nuts are screwed onto this threaded section. The protruding end section is on the chassis (not shown) connected to a vehicle. A pivot spindle 5 is

attached to the lower end of the cylinder body /., making the hydraulic damper 1 between the chassis and a wheel axle of the vehicle is mounted. One Coil spring 8 is located between an upper spring holder 6, which is at the protruding end of the piston rod 3, and a lower spring retainer x7 attached to the outer periphery of the cylinder 2. The coil spring 8 coaxially surrounds the hydraulic damper 1. A tube 9 is on the upper spring holder fastened and surrounds the piston rod 3 coaxially. The tube 9 cooperates with the upper spring holder 6 ,, to form a first tube part of the invention, which a closed top and an open bottom. Has the end. ■

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At one end of a flexible or elastically deformable and flexible tubular part is attached to the outer circumference of the tube 9 by the tubular part 11 clamped between the tube 9 and a retaining ring 10

is. - '"■' ■

The other end of the tubular part ;; 11 ir.t on one second pipe part 12 is attached, which has a closed bottom that extends on the outer circumference of the cylinder 2 is attached. The tubular part 12 also has a tubular section 13, which is coaxial with the cylinder '2 surrounds. The deformable tubular part 11 is between the tubular section 13 and a retaining ring 14 clamped. It should be noted that · the diameter of the second pipe part 12 is larger than the pipe 9 forming the first pipe part.

The part 11 is designed in such a way that it has a first tubular wall section 11b which runs along the pipe 9 of the first pipe part L. The part 11 furthermore has a second tubular wall section 11a which is coaxial with the first wall section from

second tubular part 12 extends upwards. In the end the part 11 comprises a roll wall portion 11c, which with the first and second. Wall section 11b. and 11a connected '. The roll wall portion 11c is. in the drawing upwardly convex.

• The flexible part 11 works with the two pipe parts 6, 9 and 12 together form an air chamber 15

to form that acts as an air spring. An air supply / exhaust passage 16 is provided, for example, in the piston rod 3 in order to supply or drain to bring serving compressed air into the air chamber 15 or • to discharge it therefrom. At 17 a buffer element is shown

■ placed, which is attached to the spring holder 6 and made of rubber. This buffer element prevents the cylinder 2 from striking the spring holder directly 6. A protective tube 19 with a variety of

• Openings 20 is attached to the spring holder 6, the surrounds the spring 8 and extends to below the spring holder.

If the vehicle is heavily loaded during operation and therefore whose height decreases, the height adjustment device detects Height change and ensures a supply of 'pressure. air "through the passage 16 into the air chamber 15,; whereby

■ a predetermined altitude is set again. if . a load on the vehicle is removed /

so the height of the vehicle increases. The height adjustment

•. Device then pushes part of the air chamber

located compressed air and thus holds the predetermined. te altitude upright.

. According to the invention, the tube 9 is on the upper part of the unit and the flexible tubular one Part 11 surrounds the tube 9 and is convex towards the top educated. It is thus possible to effectively reduce the accumulation of

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Dirt, stones or the like on the outer circumference of the pipe 9 to prevent, thereby reducing the risk of foreign materials between the tube 9 and the resilient Part 11 to be pinched. The deformable part 11 is convex in the upward direction and the tubular part 12 is attached to the cylinder body 2. In this way, a drainage valve 18 can easily be attached to the pipe part 12. Through this it is possible to use water that came in the air. mer · 15 has accumulated.

1.0 '■

It should be noted that US Pat. No. 3,363,893 describes a device whose functional effect is that of the invention to the extent that the penetration, of foreign ^ 'Prevents materials in the contact area between the resiliently deformable pipe part and the rigid Rohrioil will. The general construction of the device is the same as that of the invention. However, this has to do with the piston rod Attached first tubular part has a larger diameter than the second tubular part, which is connected to the cylinder body is connected .. Therefore, the first pipe part protrudes radially outside of the second pipe part or overlaps it by a substantial axial length. The resiliently deformable pipe part runs along the inner circumference of the first pipe part and along the outer circumference of the second pipe part, the roll wall section being convex upwards is. The arrangement is disadvantageous in that the roll wall section in the direction of the .Inner der Druck- " ■ 'chamber is convex. The resiliently deformable r-ohr form Ly α • Part absorbs the pressure as a compressive force, which increases the wall thickness this tubular part is enlarged and the difference in diameter between the two pipe parts is reduced must become. Furthermore, drain water accumulated in the air chamber cannot be easily drained away.

35 'Fig. 2 shows a modified embodiment of a tube 21 which is fixed to the spring holder 7 de * _f so as to form the second Robrtei.l 22 according to the invention.

.3206030

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A plug 23 is attached directly to the spring holder 7 to remove water that has accumulated in the pressure chamber 15 to drain.

By means of the construction measures according to the invention described above is it possible, the aging, the damaging To keep deformation or damage to the resilient, flexible tubular part to a minimum, what would happen, for example, if dirt, stones or the like. In the space between the elastic flexible tubular part and a rigid tubular part, would be accumulated and held. Furthermore, it is possible to easily remove drainage water from the air chamber. '

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Claims (4)

HOFFMANN · EITLlS & PARTNEIi PATENT LAWYERS DR. ING. e. HOFFMANN (1930-1976). Dl PL.-I NG. W.EITLE DR. RER. NAT.K. HO FTMAN N I) ITI .. -1 N G. W. LEH N DfPL.-ING. K. FOCHSLE. . DR. RER. NAVB. HANSEN ARABELLASTRASSE-HSTERNHAUS). D-BOOOMONCHEN 81 TELEPHONE (OB?) VI1087 TE-LEX 05-29619 (PATH E) 36 461 p / hl TOKICO LTD., Kawasakx-shi, Kanagawa-ken / Japan Hydraulic damper and air spring unit Claims . Hydraulic damper and release spring unit, comprising essentially a vertical cylinder which can be attached to the wheel axle of a vehicle is, a at the upper end of the cylinder slidably protruding piston rod that is connected to the chassis of the Vehicle can be connected / characterized that the piston rod (3) surrounding a first tube part · (9) with a closed upper end (6) is attached to the upper end of the piston rod (3), with the lower end pointing downwards that a larger diameter than that of the first tube part having a second opens ■ 'pipe part (12) surrounds the cylinder (2) and with his the lower closed end is attached to the cylinder (.2), the upper end opening in the upward direction, and that an elastic and flexible tubular Part (11) with opposite ends on the one hand. is attached to the first pipe part and on the other hand to the second pipe part and thus an air chamber (15) forms, wherein the elastic tubular member (11) has a first tubular wall portion (11b), which runs along the circumference of the first tubular part (9), a second tubular wall section (11a), which runs coaxially to the first wall section (11b) and. · Has a roll wall section (11c), which with the first and second wall section is connected, this roll wall section in an upward direction is convex. 2. Hydraulic damper and air spring unit according to claim 1, characterized in that also a pedal holder (7) on the cylinder (2), separately from the second pipe part (12) is attached. 3. Hydraulic damper and air spring unit after . . Claim 1, characterized / that the second tube part (21) is formed integrally with a spring holder (7). 4. Hydraulic damper and air spring unit according to claim 1, characterized. that 25- at the bottom of the second. Pipe part (12; 7, 21) a drainage valve (18; 23) is formed ..