EP0229310A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Suspension for vehicles, with interdependent hydraulic shock absorbers
Assignee: ITT Industrie Riunite SpA
•
Filing: 1986-12-09
•
Granted: —
•
Expires: 2006-12-09
Abstract
Abstract In a suspension for vehicles, two similar hydraulic shock absorbers interconnect respective remote zones of the suspended part of the vehicle to respective non-suspended parts, such as, for example, the two opposite wheels of a same axle. Each shock absorber is of the twin tube type or the like, with a compensation chamber (44) which communicates with the lower chamber (46) of the cylinder via a communication duct formed in a valve-containing endpiece (30). Inside this duct there are arranged a compression valve (64), which allows the liquid to flow towards the compensation chamber (44) during contraction of the shock absorber and, between the compression valve (64) and the compensation chamber (44), a shut-off valve (76) which is normally open and can be operated in the closing direction by a pilot pressure. The upper chamber of each shock absorber is connected by a respective hydraulic tube to a chamber controlling the shut-off valve (76) of the other shock absorber, in order to actuate this valve (76) in the closing direction when the pressure in the abovementioned chamber exceeds a predetermined threshold.
Inventors
- 👤 Gilberto Domenichini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 16:15
CPC Classifications
B; B60; B60G; B60G21/00; B60G21/02; B60G21/06; B60G21/073; B60G21/067
Claims Analysis
Total Claims: 101
Claim 1
Independent Claim
314 words
Suspension for vehicles, in which two similar hydraulic shock absorbers interconnect respective remote zones of the suspended part of the vehicle to respective non-suspended parts, in which each shock absorber is of the type which comprises a cylinder delimited at the top by an annular cylinder head and at the bottom by a fixed valve-containing body, inside which cylinder there slides a valve-containing piston which divides up the cylinder into an upper chamber ana into a lower chamber and to which a roo extending through the upper cylinder head is rigidly fixed, and the shock absorber also comprises a compensation chamber which communicates with the lower chamber of the cylinder via the valve-containing body, this communication being controlled by automatic compression and compensation valves incorporatea in the valve-containing body, and in which the two shock absorbers are interconnected by hydraulic tubes so that, when the two shock absorbers are working in opposite directions, an extension of them corresponds to an increase in braking of the compression of the other one, characterized in that inside each shock absorber (10) the valve-containing body (30) has a duct (88, 90) for establishing communication between the lower chamber (46) of the cylinder and the compensation chamber (44), inside which duct there are arranged a compression valve (64) which allows the liquid to flow from the lower chamber to the compensation chamber during compression of the shock absorber and, between the compression valve and the compensation chamber, a shut-off valve (75) which is normally open and can be operated in the closing direction by a pilot pressure, and in that the hydraulic tubes (40) interconnect, respectively, the upper chamber (50) of one of the shock absorbers to a chamber (81) controlling the shut-off valve of the other shuck absorber, in order to actuate this valve in the closing direction by means of the pressure in the saia upper chamber.
Claim 2
Dependent Claim
314 words
Suspension for vehicles, in which two similar hydraulic shock absorbers interconnect respective remote zones of the suspended part of the vehicle to respective non-suspended parts, in which each shock absorber is of the type which comprises a cylinder delimited at the top by an annular cylinder head and at the bottom by a fixed valve-containing body, inside which cylinder there slides a valve-containing piston which divides up the cylinder into an upper chamber ana into a lower chamber and to which a roo extending through the upper cylinder head is rigidly fixed, and the shock absorber also comprises a compensation chamber which communicates with the lower chamber of the cylinder via the valve-containing body, this communication being controlled by automatic compression and compensation valves incorporatea in the valve-containing body, and in which the two shock absorbers are interconnected by hydraulic tubes so that, when the two shock absorbers are working in opposite directions, an extension of them corresponds to an increase in braking of the compression of the other one, characterized in that inside each shock absorber (10) the valve-containing body (30) has a duct (88, 90) for establishing communication between the lower chamber (46) of the cylinder and the compensation chamber (44), inside which duct there are arranged a compression valve (64) which allows the liquid to flow from the lower chamber to the compensation chamber during compression of the shock absorber and, between the compression valve and the compensation chamber, a shut-off valve (75) which is normally open and can be operated in the closing direction by a pilot pressure, and in that the hydraulic tubes (40) interconnect, respectively, the upper chamber (50) of one of the shock absorbers to a chamber (81) controlling the shut-off valve of the other shuck absorber, in order to actuate this valve in the closing direction by means of the pressure in the saia upper chamber.
Claim 3
Dependent Claim
83 words
Suspension according to Claim l, characterized in that the valve-containing body (30) has, in addition to the abovementioned compression valve (64), called the main valve, arranged inside the communication duct (88, 90), hydraulically in series with the shut-off valve (75), an auxiliary compression valve (66) hydraulically in parallel with the main compression valve (64) and with the shut-off valve (75), this auxiliary valve (66) being calibrated so as to open only when the main communication duct is blocked by the shut-off valve (75).
Claim 4
Dependent Claim
109 words
Suspension according to Claim 1 or 2, characterized in that in each shock absorber (10) the shut-off valve (75) is a cylindrical slide valve (76) which slides in a cylindrical cavity (72) formed in the valve-containing body (30) and which intersects the communication duct (88, 90), and in that the corresponding tube (40) for interconnection with the upper chamber (50) of the other shock absorber (10) leads into the cavity (72) at one end of the sliae (76) while the other end of the sliae is actea on by a spring (82) which forces back the sliae itself into a position where the communication duct (88, 90) is unobstructed.
Claim 5
Dependent Claim
164 words
Suspension according to any one of the preceding claims, characterized in that each shock absorber (10) is of the type comprising an inner tube (16) which defines the cylinder and a coaxial outer tube (12) which delimits externally the compensation chamber (44), in that between the inner and outer tubes there is arranged a middle coaxial tube (14) which extenas between the annular cylinder head (28) and the valve-containing body (30) and which defines between itself and the outer tube an annular interspace (44) constituting the compensation chamber and between itself and the inner tube an annular duct (48), in that the upper chamber (50) of the cylinder and the annular duct (48) communicate with each other at the top and in that the valve-containing body (30) has a passage (54) establishing communication between the annular duct and an outer union (36) linking the interconnecting tube (40) directly to the control chamber (81) of the shut-off valve (75) of the other shock absorber (10).
Claim 6
Dependent Claim
47 words
Suspension according to Claim 4, characterizea in that the compensation chambers (44) of the two shock absorbers (10) are provided, in the vicinity of their bottom ends, with respective external unions (38) interconnected by a tube (42) for balancing the oil level in the two shock absorbers.
Claim 7
Dependent Claim
56 words
Suspension according to any.one of the preceding claims, characterized in that the two absorbers interconnect respective transversely remote zones of the suspended part of the vehicle to respective non-suspended parts, such as the wheels of a same axle of a motor vehicle or the two siaes of a railway carriage, in order to limit the roll.
Claim 8
Dependent Claim
57 words
Suspension according to any one of Claims 1 to 5, characterized in that the two shock absorbers interconnect respective longitudinally remote zones of the suspended part of the vehicle to respective non-suspended parts, such as a front wheel and a rear wheel situated on the same side of a motor vehicle, in order to limit the pitch.
Claim 9
Dependent Claim
36 words
Hydraulic shock absorber for a suspension according to any one of the preceding claims and having the characteristics aefined in these claims. All of the above substantially as described and illustrated and for the purposes specified.
Claim 10
Dependent Claim
3 words
10 shock absorber
Claim 11
Dependent Claim
3 words
10 shock absorber
Claim 12
Dependent Claim
3 words
12 outer tube
Claim 13
Dependent Claim
3 words
12 outer tube
Claim 14
Dependent Claim
3 words
14 middle tube
Claim 15
Dependent Claim
3 words
14 middle tube
Claim 16
Dependent Claim
5 words
16 inner tube, inner cylinder
Claim 17
Dependent Claim
5 words
16 inner tube, inner cylinder
Claim 18
Dependent Claim
7 words
18 annular upper endpiece, upper cylinder head
Claim 19
Dependent Claim
7 words
18 annular upper endpiece, upper cylinder head
Claim 20
Dependent Claim
4 words
20 disk-shaped lower enapiece
Claim 21
Dependent Claim
4 words
20 disk-shaped lower enapiece
Claim 22
Dependent Claim
3 words
22 bush-type attachment
Claim 23
Dependent Claim
3 words
22 bush-type attachment
Claim 24
Dependent Claim
3 words
23 valve-containing piston
Claim 25
Dependent Claim
3 words
23 valve-containing piston
Claim 26
Dependent Claim
2 words
24 roa
Claim 27
Dependent Claim
2 words
24 roa
Claim 28
Dependent Claim
3 words
26 bush-type attachment
Claim 29
Dependent Claim
3 words
26 bush-type attachment
Claim 30
Dependent Claim
4 words
28 annular cylinder head
Claim 31
Dependent Claim
4 words
28 annular cylinder head
Claim 32
Dependent Claim
3 words
30 valve-containing body
Claim 33
Dependent Claim
3 words
30 valve-containing body
Claim 34
Dependent Claim
5 words
32 tube or dust-protection cover
Claim 35
Dependent Claim
5 words
32 tube or dust-protection cover
Claim 36
Dependent Claim
3 words
34 pipe union
Claim 37
Dependent Claim
3 words
34 pipe union
Claim 38
Dependent Claim
3 words
36 pipe union
Claim 39
Dependent Claim
3 words
36 pipe union
Claim 40
Dependent Claim
3 words
38 pipe union
Claim 41
Dependent Claim
3 words
38 pipe union
Claim 42
Dependent Claim
4 words
40 pressure-tight flexible tube
Claim 43
Dependent Claim
4 words
40 pressure-tight flexible tube
Claim 44
Dependent Claim
3 words
42 pressure-tight tube
Claim 45
Dependent Claim
3 words
42 pressure-tight tube
Claim 46
Dependent Claim
6 words
44 annular interspace, chamber compensating chamber
Claim 47
Dependent Claim
6 words
44 annular interspace, chamber compensating chamber
Claim 48
Dependent Claim
3 words
46 lower chamber
Claim 49
Dependent Claim
3 words
46 lower chamber
Claim 50
Dependent Claim
3 words
48 annular duct
Claim 51
Dependent Claim
3 words
48 annular duct
Claim 52
Dependent Claim
3 words
50 upper chamber
Claim 53
Dependent Claim
3 words
50 upper chamber
Claim 54
Dependent Claim
3 words
52 elbow passage
Claim 55
Dependent Claim
3 words
52 elbow passage
Claim 56
Dependent Claim
3 words
54 elbow passage
Claim 57
Dependent Claim
3 words
54 elbow passage
Claim 58
Dependent Claim
3 words
58 upper part
Claim 59
Dependent Claim
3 words
58 upper part
Claim 60
Dependent Claim
3 words
60 lower part
Claim 61
Dependent Claim
3 words
60 lower part
Claim 62
Dependent Claim
2 words
62 valve
Claim 63
Dependent Claim
2 words
62 valve
Claim 64
Dependent Claim
4 words
64 valve, main valve
Claim 65
Dependent Claim
4 words
64 valve, main valve
Claim 66
Dependent Claim
2 words
66 valve
Claim 67
Dependent Claim
2 words
66 valve
Claim 68
Dependent Claim
3 words
68 annular space
Claim 69
Dependent Claim
3 words
68 annular space
Claim 70
Dependent Claim
2 words
70 passage
Claim 71
Dependent Claim
2 words
70 passage
Claim 72
Dependent Claim
3 words
72 cylindrical cavity
Claim 73
Dependent Claim
3 words
72 cylindrical cavity
Claim 74
Dependent Claim
4 words
74 lower annular space
Claim 75
Dependent Claim
4 words
74 lower annular space
Claim 76
Dependent Claim
3 words
75 slide valve
Claim 77
Dependent Claim
3 words
75 slide valve
Claim 78
Dependent Claim
3 words
76 cylindrical slide
Claim 79
Dependent Claim
3 words
76 cylindrical slide
Claim 80
Dependent Claim
3 words
78 obturator collar
Claim 81
Dependent Claim
3 words
78 obturator collar
Claim 82
Dependent Claim
3 words
80 lip gasket
Claim 83
Dependent Claim
3 words
80 lip gasket
Claim 84
Dependent Claim
3 words
81 control chamber
Claim 85
Dependent Claim
3 words
81 control chamber
Claim 86
Dependent Claim
4 words
82 helical buffer spring
Claim 87
Dependent Claim
4 words
82 helical buffer spring
Claim 88
Dependent Claim
3 words
84 obturator disk
Claim 89
Dependent Claim
3 words
84 obturator disk
Claim 90
Dependent Claim
3 words
86 calibrated spring
Claim 91
Dependent Claim
3 words
86 calibrated spring
Claim 92
Dependent Claim
2 words
88 passage
Claim 93
Dependent Claim
2 words
88 passage
Claim 94
Dependent Claim
2 words
90 passage
Claim 95
Dependent Claim
2 words
90 passage
Claim 96
Dependent Claim
3 words
91 lateral passage
Claim 97
Dependent Claim
3 words
91 lateral passage
Claim 98
Dependent Claim
3 words
92 obturator disk
Claim 99
Dependent Claim
3 words
92 obturator disk
Claim 100
Dependent Claim
3 words
94 helical spring
Claim 101
Dependent Claim
3 words
94 helical spring
References Cited (Backward Citations)
No citation records indexed.
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