Source: http://www.patentsencyclopedia.com/app/20160053424
Timestamp: 2018-03-19 09:28:25
Document Index: 73286583

Matched Legal Cases: ['arts 32', 'arts 32', 'arts 32', 'art 32', 'art 32', 'arts 32', 'arts 32', 'arts 32', 'arts 32', 'arts 32', 'arts 32', 'art 32', 'art 32']

Patent application number: 20160053424
1. A damper with a) a housing (2; 2d; 2e; 2g) having a central longitudinal axis (3), at least partially encompassing a housing interior (21) by housing walls (24, 25), b) a plunger (4; 4b; 4c; 4f; 4g) displaceable in the housing (2; 2d; 2e; 2g) along the central longitudinal axis (3), guided out of the housing (2; 2d; 2e; 2g) and having at least one friction lining recess (14; 14b; 14c; 14f; 14g), wherein the friction lining recess (14; 14b; 14c; 14f; 14g) fully penetrates the plunger (4; 4b; 4c; 4f; 4g), c) fastening elements (7, 10), arranged at free ends (5, 9) of the housing (2; 2d; 2e; 2g) and the plunger (4; 4b; 4c; 4f; 4g), and d) at least one friction lining (17; 17a; 17g), arranged in the at least one friction lining recess (14; 14b; 14c; 14f; 14g), wherein said friction lining (17; 17a; 17g) is unitary and formed of one friction material, e) wherein the friction lining (17; 17a; 17g) has a thickness which is greater than a width of an intermediate channel of the housing (2; 2d; 2e; 2g), such that the friction lining (17; 17a; 17g) is permanently biased and in friction contact with said opposite housing walls (25), f) wherein when the plunger (4; 4b; 4c; 4f; 4g) is inserted or pulled-out of the housing (2; 2d; 2e; 2g), the friction lining (17; 17a; 17g) rubs against the friction lining recess (14; 14b; 14c; 14f; 14g) so as to create a kinetic friction force and cause a compression of said friction lining (17; 17a; 17g) to provide an enhanced free-wheeling effect.
2. A damper according to claim 1, wherein adjustment of the kinetic friction force is made by changes in at least one of the difference of an axial length (LR) of the friction lining (17; 17a; 17g) and an axial length (LA) of the friction lining recess (14; 14b; 14c; 14f; 14g), shape of the friction lining recess (14; 14b; 14c; 14f; 14g) and the friction lining (17; 17a; 17g), and the thickness of the friction lining (17; 17a; 17g).
3. A damper according to claim 1, wherein the friction lining recess (14; 14f) has at least one of a rectangular-shaped, diamond-shaped and rhombic-shaped form.
4. A damper according to claim 1, wherein the shape of the friction lining (17; 17f; 17g) is matched to the shape of the friction lining recess (14; 14f; 14g).
5. A damper according to claim 4, wherein the friction lining (17a) is constructed as indented on at least one end face (18a).
6. A damper according to claim 1, wherein the friction lining recess (14b; 14c) is limited by end faces (15; 15c) located at axial ends of longitudinal sides (16; 16b), each longitudinal side (16; 16b) connecting said end faces (15, 15c).
7. A damper according to claim 6, wherein the longitudinal sides (16; 16b) are constructed as jagged.
8. A damper according to claim 1, wherein the plunger (4) has a double-T-shaped cross section oriented perpendicular to an insertion direction.
9. A damper according to claim 1, wherein the friction lining recess has an axial length (LA) being larger than an axial length (LR) of the friction lining (17; 17a; 17g) such that a compression of the friction lining (17; 17a; 17g) is enhanced for the free-wheeling effect.
[0006] The object is achieved by a damper with a housing having a central longitudinal axis, at least partially encompassing a housing interior by housing walls, a plunger displaceable in the housing along the central longitudinal axis, guided out of the housing and having at least one friction lining recess, fastening elements, arranged at free ends of the housing and the plunger, and at least one friction lining, arranged in the at least one friction lining recess and in frictional contact with opposite housing walls. The basis of the invention is to provide a continuous window on the inside end of a plunger guided in a housing, in which window a friction lining is arranged. This one friction lining is in frictional contact with opposite inside walls of the housing. The attenuation characteristics of the damper can be freely set by the configuration of the window--the friction lining recess--and of the friction lining. Moreover, the arrangement has the advantage that only one single friction lining is required for friction on two friction surfaces.
[0028] A third embodiment of the invention is described below with reference to FIG. 7. Identical parts are given the same reference numerals as in the first embodiment, to the description of which reference is herewith made. Structurally different, but functionally similar parts are given the same reference numerals with a b placed after them. The main difference from the first embodiment is that the longitudinal sides 16b, which limit the recess 14b laterally, are constructed not as smooth, but as indented or meandering. The points 30 of the longitudinal sides 16b press into the friction lining 17 from the side, so it is better fixed along direction 8.
[0029] Owing to the axial fixing no free-wheeling effect occurs. The build-up of frictional force is not so gentle at the start of insertion or pushing out of the plunger 4, but more abrupt. The friction lining 17 may additionally have teeth on its longitudinal sides 19, which match the longitudinal side 16b.
[0030] A fourth embodiment of the invention is described below with reference to FIG. 8. Identical parts are given the same reference numerals as in the first embodiment, to the description of which reference is herewith made. Structurally different, but functionally similar parts are given the same reference numerals with a c placed after them. The main difference from the first embodiment is that the end faces 15c are not planar, but are provided with lugs 31 projecting into the recess 14c, in particular two lugs. If the friction lining 17 has a length LR corresponding to the distance between the opposite points of the lugs 31, a gentle free-wheeling effect occurs owing to the compression of the friction lining 17. There is a gentle, progressive build-up of frictional force. The lugs 31 first penetrate the friction lining 17. Only then does the respective end face 18 of the friction lining 17 encounter the end face 15c of the recess 14c. If the friction lining 17 is shorter than the distance between the points of the lugs 31, a more marked free-wheeling effect occurs, owing to the slipping of the friction lining 17 in the recess 14c. There is thus a gentle, progressive build-up of frictional force.
[0031] A fifth embodiment of the invention is described below with reference to
[0032] FIGS. 9 and 10. Identical parts are given the same reference numerals as in the first embodiment, to the description of which reference is herewith made. Structurally different, but functionally similar parts are given the same reference numerals with a d placed after them. The main difference from the first embodiment is that the housing 2d is not constructed as one part, but consists of two preferably identical housing parts 32, locked to one another, for example. The connecting mechanism for connecting the two housing parts 32 is a linear bayonet, which is braced in the last part of the locking movement. In principle, locking of the two parts 32 is also possible. The housing part 32 has a base plate 33, on the axial end 5 of which a fastening element 7 is provided. On the inside of the base plate 33, one half of the longitudinal channels 22 is formed in the shape of longitudinal grooves. Between them is located the intermediate channel wall 25, projecting upwards, on which the friction insert 26, consisting of sheet metal, is arranged. The base plate 33 has two axially extending, outer longitudinal flanks 34, 35. Along flank 35 teeth 36 are provided laterally, i.e. projecting outwards, with lugs 37 projecting downwards in the manner of a toothed strip. The top of the teeth 36 defines a planar first sliding face 38.
[0033] In the region of the longitudinal flank 34 is formed a rail 39, U-shaped in cross-section, extending axially and open towards the base plate 33, consisting of a lower strip 40, a central strip 41 running perpendicular thereto and an upper strip 42 arranged parallel to the lower strip 40 and connected to the central strip 41. The top of the lower strip 40 defines a second sliding face 43, sliding faces 38 and 43 being located in the same plane. The upper strip 42 is formed by a row of teeth 44 with lugs 45, corresponding to teeth 36 and lugs 37 and located at the same axial height. Recesses 46 are provided in the lower strip 40 in the region of the teeth 44, to simplify removal from the mould during the injection-moulding process of the housing part 32. For assembly, two housing parts 32 are placed on top of one another, offset by one tooth position, and then displaced axially by one tooth position, so the two housing parts 32 are overlapped and locked to one another. Catching lugs, not illustrated, are provided on the lugs 37 for this purpose, which prevent the housing parts 32 slipping apart. An advantage of the configuration of the housing parts 32 is the fact that they can be easily produced. It is also possible to dispense with integrated axial securing, which produces locking, and to produce axial securing of the two housing parts 32 by joining a layer of rubber and a spacing bush in the eye.
[0034] A sixth embodiment of the invention is described below with reference to FIGS. 11 and 12. Identical parts are given the same reference numerals as in the first embodiment, to the description of which reference is herewith made. Structurally different, but functionally similar parts are given the same reference numerals with an e placed after them. The main difference from the fifth embodiment according to FIGS. 9 and 10 is in the configuration of the catching elements and the locking movement. On the right side of the base plate 33 in FIG. 12 is provided a continuous strip 47 with catching lugs 48 projecting upwards, the catching lugs 48 decreasing in profile laterally outwards transversely to the central longitudinal axis 3. As in the fifth embodiment, formed on the opposite side of the base plate 33 is a rail, U-shaped in cross-section, with strips 40e, 41e, 42e. Strip 42e is formed by catching teeth 44e, arranged above recesses 46e. During assembly, two housing parts 32e are placed on top of one another at the same axial height and locked together perpendicular to direction 8 along a catching direction 49. The catching lugs 48 of the upper housing part 32e engage in the recesses 46e of the lower housing part 32e. The same applies to the corresponding, opposite row of catching lugs 48.
[0035] A seventh embodiment of the invention is described below with reference to FIG. 13. Identical parts are given the same reference numerals as in the first embodiment, to the description of which reference is herewith made.
[0036] Structurally different, but functionally similar parts are given the same reference numerals with an f placed after them. The main difference from the first embodiment is in the configuration of the friction lining recess 14f. This is diamond-shaped, i.e. two opposite sides are parallel to one another in each case, are not perpendicular to one another and all the sides are the same length. Two opposite points face along the insertion direction 8. In the diamond-shaped friction lining recess 14f is arranged a diamond-shaped friction lining, not illustrated, matching the recess 14f. The advantage of the diamond-shaped configuration is the reduction of the static friction points at the start of a friction process. The friction lining is constructed tapering to a point along direction 8, so the static friction forces acting on the points are lower at the start of a movement. The diamond-shaped configuration of the recess and the friction lining results in an improved running property of the damper. Otherwise, the plunger has a trough-shape in the region of the side bridges 11f and 12f and of the intermediate bridge 13f, which shape is explained in greater detail with the aid of the next embodiment, reference herewith being made thereto.
[0037] An eighth embodiment of the invention is described below with reference to FIG. 14. Identical parts are given the same reference numerals as in the first embodiment, to the description of which reference is herewith made. Structurally different, but functionally similar parts are given the same reference numerals with a g placed after them. The main difference from the first embodiment is in the configuration of the indentation formed by the side bridges 11g and 12g and by the intermediate bridge 13g on the top and bottom of the plunger 4g. In the first embodiment, the plunger has on the top and the bottom in each case a U-shaped, i.e. overall an H-shaped, cross-section, i.e. the outer walls of the side bridges are perpendicular to the intermediate bridge. In the present embodiment this is different. There the top and the bottom of the plunger 4g have a trough-shaped indentation. This means that the inner faces 50 of the side bridges 11g and 12g enclose with the bottom face 51, formed by the outside of the intermediate bridge 13g, an angle of more than 90°, i.e. the inner faces 50 run obliquely outwards. The housing 2g has a corresponding trough-shaped constriction, formed by side bridges 52 and 53, which run parallel to the inner faces 50, and an intermediate bridge 54, which runs parallel to intermediate bridge 13g. Provided on the inside of bridges 52, 53 and 54 is a correspondingly shaped friction insert 26g, which rests against the inside of bridges 52, 53 and 54 and is fastened there. There is only a small amount of play between the legs of the friction insert 26g and the inner faces 50. Otherwise there is a greater amount of play 55 between the side bridges 11g and 12g and the inside of the housing 2g, so if the plunger 4g is in an oblique position in the housing 2g in the region of the play 55, there is no contact between the plunger 4g and the inside 2g. The double-trough-shaped configuration of the plunger 4g and the friction insert 26g causes the plunger 4g to be automatically centred in two dimensions in the sectional plane illustrated in FIG. 14 and continually brought back into the central position. Moreover, this avoids hard striking between the plunger 4g and the housing 2g.