DE1775351A1 - Bottom valve for a hydraulic shock absorber - Google Patents

Description

Bottom valve for a hydraulic shock absorber

The invention relates sioh to telescopic Shock absorber «

A common type of telescopic! hydraulic shock absorber has a pair of concentrically arranged hydraulic cylinders, as well as a piston displaceable in the inner cylinder, in the ends of the cylinders in front of the piston a valve arrangement that kicks the two cylinders and aligns them with one another. Duroh the valve arrangement the inner cylinder can be brewed in connection with the annulus delimited by the two cylinders and forms a reservoir for the hydraulic fluid. The valve arrangement provided at the cylinder ends is often referred to as a bottom valve.

With some shock absorbers, the bottom valve must be able to

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optionally the flow of hydraulic fluid in both directions between the inner cylinder (often Called pressure cylinder) and the "hydraulic storage tank to regulate" Bottom valves acting in this way must necessarily allow the liquid to pass through in two opposite directions and with valve organs for this be provided on both flow paths which must be assembled very carefully and with skill

The invention is based on the problem of the type of construction To simplify solhen bottom valves by reducing the number of components required.

The bottom valve arrangement according to the invention accordingly has a thimble-like or similarly cup-shaped formed component, which is carried by the main body of the valve assembly and as a guide and holding member both for a valve bottom plate, with which the liquid flow through the valve main body is controlled, as also serves for a valve spring which presses the valve base plate into a position in which the passage of fluid is completely or almost completely prevented.

The bowl-shaped, thimble-like suitably carries and leads Part at the same time a second Ventilversohluss member together with associated valve spring with which the passage of the liquid can be controlled in the opposite direction «

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Further details and advantages of the invention can be found in the following description of two of the drawings illustrated embodiments of the new bottom valve.

Fig. 1 shows in axial longitudinal section part of a with the bottom valve according to the invention equipped telescopic hydraulic shock absorber;

Fig. 2 shows the bottom valve in plan;

Figure 3 is a section on line A-A of Figure 2;

4 shows another embodiment in a similar section of the bottom valve.

The shock absorber illustrated in Fig. 1 has an annular space 14 which is used to receive a supply of hydraulic Liquid is used and an inner pressure cylinder 10 and an outer cylinder coaxially arranged therewith 12 is limited. A piston 16, which is a rearwardly directed piston rod, is displaceable in the pressure cylinder 10 18 has.

At their lower ends (Fig. 1), the cylinders 10 and

a bottom valve assembly 20 which closes the cylinder 10 and at the same time secures in its position in the cylinder 12. The bottom valve assembly 20 has a main valve body 22, which closes the lower end of the cylinder 10 like a plug and provides one with an axial bore

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New central part 24 has a number of projections 26 distributed at intervals around its circumference extending radially outward. These projections 26 provided as main valve body 22 are used collectively to position cylinder 10 inside cylinder 12 Secure between the sockets there are radial incisions 28 which lead to a lower recess 30 provided axially in the central part 24. The axial bore 25 provided in the main valve body opens into recess IK 30 on the one hand and into an upper, axially arranged recess 32 on its other end.

This upper axial recess 32 is of an annular shape formed valve seat 34. Similarly, an annular, rib-like valve seat 36 delimits the lower Recess 30. Located at a radial distance from the valve seat 34 A further valve seat 38 arranged concentrically to this seat is located on the middle part 24 · The two valve seats 34 and 38 delimit a ring area of the main valve body between them 22, in which several axially directed and mutually spaced apart in the circumferential direction Open parallel holes 40 through the liquid in can flow through the bottom valve arrangement in one direction This liquid passage is possible by means of a or valve plate 42 adjustable, which on the seats 34 and 38 Duroh the axial bore 25 protrudes through a pin-like sleeve 44, which at its lower end in its head which usually rests on the valve site 36. Near the head end 46 of the sleeve 44 are radial openings on it

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48 provided) which open into a hanging groove 50 on the sleeve circumference and forming a second passage for the liquid through the valve body 22 so that the liquid is opposite can flow to the flow through the bores 40 and that according to the regulation by the sleeve head 46, which acts as a valve closure member.

Valve plate 42 and sleeve head 46 are pressed against the valve seats assigned to them by means of springs 45 and 47. Both Springs 43 and 47 are at one of their ends by an approximately cylindrical, thimble-like and approximately cup-shaped part 52 in their positions and guided. The floor this cup 52 lay in the recess 32 of the valve body and its upper end protrudes beyond this body and points an outwardly directed flange 54 against which the spring 43 sets. The spring 47 is supported on the bottom of the cup 52 on the one hand and on the other hand on a spring plate or the like. 56, which is provided at the free upper end of the sleeve 44. In this catfish not only the sleeve head 46 is on his Seat 36 pressed, but the cup 52 is also held firmly in the recess 32 of the valve body 22 «·

According to the invention, a bottom valve arrangement is created in this way, which allows the liquid to escape through a durometer de »allows container 14 into the interior of the printing cylinder · 10, when the piston 16 fled in the cylinder near aueien moved. The resulting pressure difference across the valve causes the « the valve plate 42 is raised against the action of the spring 43 will. Suddenly the piston moves in the opposite direction

Riohtung, the fluid pressure in the Druokzylln-

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10 and acts through the sleeve 44 and the bores 48 the sleeve head 46, so that it counteracts the effect of the Spring 47 is lifted from its seat 36 · Small amounts of hydraulic fluid can be released with small movements of the Piston 16 in both directions through provided in valve seat 38 Grooves 39 pass through · In order to meet all of these operating conditions, the bottom valve according to FIG Invention only a very small number of components «This is primarily due to the very compact design of the two valve closing members 42 and 46 and their associated valve springs, which in turn is due to the use of the Thimble-like bowl is made possible.

The bottom valve of the embodiment illustrated in FIG. 4 can readily be used instead of the valve according to FIG. 1 come. A valve body 60 has an axial bore 62, the top in a recess 64 and at its lower end opens into a recess 66. This recess 66 is delimited on the outside by an apron-like projection 68 · This skirt 68 has openings distributed over its circumference

on. In the upper end face of valve body 60 there is an annular groove 72 which surrounds recess 64 at a radial distance. From this annular groove 72 extend several axially directed, parallel channels 74 distributed at a distance from one another over the circumference through the valve body and open into the recess 66. The channels laaeen alao the passage * »* flows through the valve body from liquid. This flow of liquid is controlled by means of a valve plate 76 which lies on the upper end face of the valve body 60 and covers the annular groove 72 "

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A pin-like sleeve 78 widens outwards at its lower end and carries a spring abutment 80. The sleeve 78 protrudes through the axial bore 62 of the valve body 60 «between the abutment 80 and a radial surface 86 of a closure part 84, which closes the bore 62, there is a valve spring 82. The upper end of the peg-like Sleeve 78 ends in a head piece 88, which is provided by means of the spring 82 in the direction of the bottom of the valve body Depression 64 is pressed ". Between this bottom and the head piece 88, the bottom of the thimble-like bowl 90 is clamped" This cup is dimensioned and shaped so that it guides the valve plate 76 and secures it in place. On his At the upper end, the cup has a radially outwardly directed flange edge 92 which is a disk-like spring 94 holds, which presses the valve plate onto its seat. A blind hole 96 at the head end of the peg-like sleeve 78 is with the axial bore ftmoucKxjEfmmtH 62 of the valve body via 8 radial openings 98 in connection and in this way provides a second one controlled by the closure member 84, 86 Passage for the liquid.

The operation of this embodiment of the invention is similar to that previously described. If the piston moves in Pressure cylinder 10 to the outside, so the valve plate 76 is raised · Liquid can then from the storage space 14 in the interior of the cylinder 10 through the recess 66 of the valve body and through the channels 74. A movement of the piston in the opposite direction generates a fluid pressure in the cylinder 10, which when a

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Value, which is determined by the spring 82, the locking member 841 86 opens, so that the liquid is in reverse kelly Direction can flow "

Claims

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Claims (8)

Claims ι 1. Bottom valve assembly for a telescopic hydraulic shock absorber, characterized by a thimble-like design on the main valve body the arrangement stored cup or the like. (52 or 90), the both a plate valve (42 or 76) for controlling the passage of fluid through the valve body, as well a valve spring (43 or 94) guides and secures, which presses the plate valve into a position in which the fluid can pass is completely or almost completely prevented. 2 «, base valve arrangement according to claim 1, characterized in that that the cup (52) also has a second valve closure member (44, 46) together with the associated valve spring (47) guides and secures, with the help of which a second fluid path leading through the valve arrangement can be controlled which is directed opposite to the first liquid passage, 3. Bottom valve arrangement according to claim 1 or 2, characterized in that that the valve body (26 or 60) has a axial bore (25 or 62) which at both ends of the valve body in an axial recess (30, 32 or 64, 66) of these valve body ends opens, the thimble-like cup (52 or 90) in one of these Aue- 109821/0694 - 10 - BATH ORIGINAL Savings is provided and the plate valve is above the cup and the valve seat surrounding the recess locks " 4. Bottom valve arrangement according to claim 3 »characterized in that the opening opening into the other recess the axial bore (25 or 62) is surrounded by a further valve seat and the aforementioned second valve closing member carried by a pin-like sleeve (44 or 78) protruding through the axial bore above and is secured in its position opposite this valve seat 5 · bottom valve arrangement according to claim 4 »characterized in that the second valve closing member of one with the pin-like sleeve (44) is formed from a one-piece head (46). 6. Bottom valve arrangement according to claim 5 »characterized in that the pin-like sleeve (44) with its one end protrudes from the thimble-like cup (52) and on this End of a spring abutment (56) carries, between this Abutment and the bottom of the cup a spring (47) clamped is, which holds the cup in the recess (32) by clamping. 7. bottom valve assembly according to claim 6, characterized in that that the bowl or the like. (52) on its upper edge has a radially near outwardly straightened plan (54) which 109821/0694 - «- BADORtOlNAt forms an abutment for a spring (43), the other end of which acts on the plate valve (42). 8. base valve assembly according to claim 4 _t characterized in that the pin-like sleeve (78) projects with play through the axial bore (62) of the valve body (60) and having at one end a head piece (88) connected to the bottom of the fingerhutart igen cup (90) cooperates, while the second valve closing member is formed by a cylindrical part (84) which is mounted displaceably on the sleeve (78) and has a radial flange (86) and which faces the mouth end of the bore facing away from the cup (90) (62), whereby a spring (82) clamped between the closing element (84, 86) and an abutment at the other end of the sleeve presses this closing element (84, 86) against its valve seat and the cup (90) is resilient by means of the head piece (88) secures in its recess «, 9 · Bottom valve arrangement according to claim 8, characterized in that the upper, flange-like, directed radially outwards Edge (92) of the cup (90) forms the abutment for the upper part of a woodruff key (94), the outer land acts on the plate valve (76). • 10.-Telescopic hydraulic shock absorber with a pair of concentrically nested hydraulic cylinders and one slidable in the inner cylinder Piston »characterized by a according to one of the previous claims trained bottom valve assembly 109821 / 069A - 12 - tion, the ends of the two in front of the piston (16) Cylinder (10 and 12) closes, this secures them in their mutual positions to each other and a connection of the inner Cylinder (1O) with the Riograum (H) allows between the two cylinders and forms a reservoir for the hydraulic fluid. 109871