Damping device

Abstract

A damping device for damping or avoiding pressure surges, such as pulses, in hydraulic supply circuits has a damping housing (1) surrounding a damping chamber and having a fluid inlet (35) and a fluid outlet (41). A fluid receiving chamber extends between the fluid inlet (35) and the fluid outlet (41). During operation of the device, a fluid flow crosses the damping chamber in a throughflow direction (11), from the fluid inlet (35) to the fluid outlet (41). Parts of the fluid receiving chamber extend transversely with respect to the throughflow direction (11). More than one fluid receiving chamber is arranged one after the other in the throughflow direction (11). The fluid receiving chamber that is first upstream and the fluid receiving chamber that is last downstream immediately adjoin the fluid inlet (35) and the fluid outlet (41), respectively.

Claims

1. A damping device for damping pressure surges in hydraulic supply circuits, comprising: a damping housing having a fluid inlet, a fluid outlet, a base part with pot-shaped recesses and flanged-shaped first and second cover parts, said first and second cover parts being engaged flush in said pot-shaped recesses; a damping chamber surrounded by said damping housing and extending between said fluid inlet and said fluid outlet such that a fluid flow crosses said damping chamber in a throughflow direction from said fluid inlet to said fluid outlet, parts of said damping chamber extending transverse to the throughflow direction, said damping chamber including first and second fluid receiving chambers arranged sequentially in the throughflow direction, said first fluid receiving chamber immediately adjoining said fluid inlet and being upstream of said second fluid receiving chamber in the throughflow direction, said second fluid receiving chamber immediately adjoining said fluid outlet and being downstream of said first fluid receiving chamber in the throughflow direction, said first and second fluid receiving chambers forming disk-shaped cavities in said base part; first and second base boundary walls in said base part defining said first and second fluid receiving chambers, respectively; and first and second cover boundary walls on said first and second cover parts, respectively, defining said first and second fluid receiving chambers, respectively.

2. A damping device according to claim 1 wherein each of said first and second fluid receiving chambers is at least one of cylindrical or polygonal.

3. A damping device according to claim 1 wherein each of said first and second fluid receiving chambers has equal volumes and has a same contour.

4. A damping device according to claim 1 wherein each of said first and second fluid receiving chambers has a different volume and a different contour.

5. A damping device according to claim 1 wherein said first and second base boundary walls are parallel to said first and second cover boundary walls; and said fluid inlet and said fluid outlet are aligned with said base and cover boundary walls.

6. A damping device according to claim 5 wherein said fluid inlet and said fluid outlet comprise damping housing bores with cross-sectional diameters equal to a distance spacing said first and second base boundary walls from said first and second cover boundary walls.

7. A damping device according to claim 6 wherein said first and second fluid receiving cavities are connected in fluid communication via a fluid passage axially aligned with said fluid inlet and said fluid outlet, said fluid passage being located in a wall segment of said base part and having equal cross-sectional diameters with said fluid inlet and said fluid outlet.

8. A damping device according to claim 1 wherein sealing rings are received in circumferential grooves on engagement pieces of said first and second cover parts, said sealing rings seal said first and second fluid receiving chambers relative to an environment surrounding said damping housing.

9. A damping device according to claim 1 wherein said first and second cover parts have penetration bores extending diametrically opposite to vertical axes of said first and second cover part, said penetration bores being penetrated by fixing screws engaged with said base part to fix said cover parts to said base part.

10. A damping device according to claim 9 wherein said fixing screws are spaced from regions of said fluid inlet and said fluid outlet and are uniformly arranged along external circumferences of said first and second cover parts and surrounding said first and second first and second fluid receiving chambers.

11. A damping device according to claim 1 wherein said first and second fluid receiving cavities are connected in fluid communication via a fluid passage axially aligned with said fluid inlet and said fluid outlet, said fluid passage being located in a wall segment of said base part and having equal cross-sectional diameters with said fluid inlet and said fluid outlet.

12. A damping device according to claim 11 wherein said wall segment extends from a junction of said first and second base boundary walls and engages facing surfaces of said first and second cover plates.

13. A damping device according to claim 1 wherein receptacles receiving sealing rings surround said fluid inlet and said fluid outlet on exterior surfaces of said damping housing.

14. A damping device according to claim 1 wherein said damping device is fixable to another component by fixing bolts surrounding at least one of said fluid inlet or said fluid outlet.

15. A damping device according to claim 1 wherein both of said first and second fluid receiving chambers are in a single one of said damping housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Referring to the drawings that form a part of this disclosure:

(2) FIG. 1 is a perspective view of a damping device according to an exemplary embodiment of the invention, relative to a practical embodiment, is depicted downscaled with a scale of approximately 1:3;

(3) FIG. 2 is a top view of the damping device of FIG. 1, depicted double the size of FIG. 1;

(4) FIG. 3 is a side view in section of the exemplary embodiment along line III-III of FIG. 2;

(5) FIG. 4 is a partial end view of only the fluid outlet connection region of the damping housing of the exemplary embodiment; and

(6) FIG. 5 is a partial end view, of only the fluid inlet connection region of the exemplary embodiment.

DETAILED DESCRIPTION OF THE INVENTION

(7) With reference to the drawings, the invention is explained on the basis of the exemplary embodiment of a silencer provided to reduce the oscillations produced by pulsations in hydraulic fluids subject to high pressure, for example in the region of 200 bar. The basic mechanical construction corresponds to a silencer provided for such an application, as is described as subsequently published prior art in the patent application DE 10 2014 005 822.0. In the present figures, the exemplary embodiment of the damping device is depicted in the assembled state. As can be best seen from FIG. 3, the damping housing 1 depicted in these figures has three main parts, namely, a base part 3 and cover parts 5 and 7, which cover parts are formed as identical parts. As FIGS. 1 and 2 show, the base part 3 has the contour of a rectangle having rounded corner regions 9 and having a longitudinal axis 11. The extension of the longitudinal axis corresponds to the throughflow direction of the fluid, which flows into the device from the end side 13 lying on the left-hand side in the figures and 10 and leaves the device at the opposite end side 15. For the formation of the fluid receiving chambers 17 and 19, the base part 3 has two central recesses 21 and 23 (cf. FIG. 2). Recesses 21, 23 are formed by circular, pot-like depressions and are delimited by unrecessed, surrounding wall parts 25 (FIG. 3) of the base part 3. The central recesses 21, 23 are closed at the base by boundary walls 27 and 29 of the base part 3, which boundary walls extend in a common plane. For the purpose of limitation of the fluid receiving chambers 17 and 19 having a disk-shape, the cover parts 5 and 7 with their planar bottom side form top boundary walls 31 and 33 that, in the case of cover parts 5 and 7 mounted on the base part 3, extend in a plane parallel to the boundary walls 27 and 29. The fluid inlet 35 is located on the end side 13 of the base part 3 and lies on the left-hand side in the drawings, which fluid inlet is aligned with the boundary walls 27 and 31, so that the diameter of the fluid inlet 35 corresponds to the thickness of the circular disk-shaped fluid receiving chamber 17.

(8) The circular disk-shaped cavity forming the second fluid receiving chamber 19 is formed in the central recess 23 of the base part 3 and is connected to the fluid receiving chamber 17 that is first upstream by a fluid passage 37. Fluid passage 37 is located in the wall section 39 of the base part 3 that lies centrally between the end sides 13 and 15. The fluid passage 37 is coaxial to the axis 11 and has the same diameter as the fluid inlet 35. In the depicted exemplary embodiment, both fluid receiving chambers 17 and 19 are formed by circular central recesses 21 and 23 of the same type and they therefore have the same volumes. In the end side 15 lying on the right in the drawings, the fluid outlet 41 is located in the wall part 25 of the base part 3, which fluid outlet, like the fluid inlet 35 and the fluid passage 37, is coaxial to the axis 11, and thus, to the throughflow direction and has the same diameter as the fluid inlet 35 and the fluid passage 37.

(9) As can be seen from FIG. 3, the cover parts 5 and 7 are designed as flange-shaped identical parts. Starting from a top side, which, in the state mounted on the base part 3, overlaps the wall parts 25 of the base part and the wall section 39, the cover parts 5 and 7 each have a projecting engagement piece 43, which is formed circular cylindrical and, in the case of a position mounted on the base part 3, engages in a fitting manner in the central recesses 21 or 23. Each engagement piece 43 has a circumferential annular groove 45, in which a sealing ring 47 is seated. Sealing ring 47 seals the engagement pieces 43 relative to the wall parts 25 and to the wall section 39 of the base part 3, and thus, seals the fluid receiving chambers 17 and 19 relative to the environment.

(10) For the screwing of the cover parts 5, 7 to the base part 3, threaded bores are formed in the base part, which are not visible in the drawings. For eight fixing screws 51 of each cover part 5, 7, these threaded bores are arranged in partial circular arcs, which surround the central recesses 21 and 23. By the fixing screws and threaded bores, the cover parts 5, 7 can be fixed to the base part 3 in such a way that they adjoin one another with their flat side 53 at the central wall section 39 of the base part 3. In the region opposite the flat side 53, the cover parts 5, 7 are shaped such that, in the mounted state, they are adapted to the outer contour of the base part 3, with flat sides 55 of the cover parts 5, 7 respectively being flush with the end side 13 and the end side 15 of the base part 3 at the fluid inlet 35 and the fluid outlet 41 and with a step-free outer shape being formed also in the rounded corner regions 9 also.

(11) For the attachment of the damping housing 1 to corresponding third components, in the depicted exemplary embodiment at the end side 15 lying on the right-hand side in the drawings threaded bolts 57 are provided arranged symmetrical to the fluid outlet 41. In addition, a receiving groove 59 for a sealing ring is formed at the opposite end side 13 at the fluid inlet 35. For coupling connections, fixing bores 61 are arranged at the end side 13 in a symmetrical arrangement relative to the fluid inlet 35.

(12) It shall be understood that, in a corresponding manner, a sealing arrangement can be provided at the end side 15 assigned to the fluid outlet 41. The symmetrical housing construction also allows the interchanging of the inlet side and the outlet side, potentially with changed sealing geometries. Due to the disk-shaped damping chambers with a cavity expanded transverse to the actual throughflow direction, a silencer with high efficiency is obtained, which silencer has a low weight relative to its settable fluid volume. Furthermore, there is only a slight amplification, if any, between the silencer and a hydraulic pump connectable thereto.

(13) In one embodiment of the damping device according to the invention, which is not depicted in detail, it is possible for the individual, consecutively arranged damping chambers 17, 19 to be differently designed with respect to their volume, in order to then create damping chambers of different sizes, so that individual frequency bands with different frequencies can be effectively dampened, with one damping chamber 17 being able to be assigned to the one frequency band and the other damping chamber 19 being able to be assigned to the comparatively different type of frequency band. Furthermore, in an additional consecutive arrangement, which is likewise not depicted, a further third damping chamber and, if appropriate, additional damping chambers can be connected to the two first damping chambers 17, 19, if appropriate with changed volumes, so that, starting from a damping chamber with the smallest volume to a largest damping chamber connected thereto in a media-conducting manner, within the chain a relief of the pressure sequence of the media flow takes place, so that effective damping effects can be generated in this respect also. There is no equivalent of this solution in the prior art.

(14) While one embodiment has been chosen to illustrate the invention, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention as defined in the claims.