US4926983A
Expired / Lapsed
US
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Hydraulic shock absorber
Assignee: Robert Bosch GmbH
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Filing: 1989-01-24
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Granted: 1990-05-22
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Expires: 2009-01-24
Abstract
Abstract A hydraulic shock absorber with automatically adjustable damper force which actuates an electromagnetic rotary adjuster for a control slide that monitors a sole flow cross section. The rotary adjuster is embodied as a permanently excited single-winding rotary adjuster, and because of its permanent magnetic poles in the rotor, even when it is currentless it furnishes a torque that assures safety resetting of the rotary adjuster if the current fails. The hydraulic shock absorber is intended for controlling the undercarriage of a motor vehicle.
Inventors
- 👤 Bernd Taubitz
- 👤 Peter Zieher
- 👤 Claus Kramer
- 👤 Kurt Engelsdorf
- 👤 Armin Schuelke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:40
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/44; F16F9/46; F16F9/461; F16F9/462; B; B60; B60G; B60G17/00; B60G17/06; F16F15/00; F16F15/02; F16F15/023; F16F15/03; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86734
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
161 words
A hydraulic shock absorber having an automatically adjustable damper force, which comprises a cylinder (2), a damper piston (7) that is axially movable in said cylinder, said damper piston divides said cylinder interior into two chambers (9, 10) and has a controllable flow across section, a piston rod (6) connected to said damper piston within said cylinder and protruding to the outside through one end of said cylinder, a control slide (14) including at least two solid sections and at least two oppositely disposed sections having a plurality of radial openings, a fixed hollow cylinder slide surrounding said control slide (14) and provided with a plurality of radial openings (54) relative to said control slide (14), an electromagnetic rotary adjuster (13) within said piston for controlling said control slide for monitoring at least two flow cross sections, said electromagnetic rotary adjuster (13) is a permanently excited single-winding rotary adjuster having a maximum adjusting range of 30°, and a magnetic safety resetting.
Claim 2
Dependent Claim
161 words
A hydraulic shock absorber having an automatically adjustable damper force, which comprises a cylinder (2), a damper piston (7) that is axially movable in said cylinder, said damper piston divides said cylinder interior into two chambers (9, 10) and has a controllable flow across section, a piston rod (6) connected to said damper piston within said cylinder and protruding to the outside through one end of said cylinder, a control slide (14) including at least two solid sections and at least two oppositely disposed sections having a plurality of radial openings, a fixed hollow cylinder slide surrounding said control slide (14) and provided with a plurality of radial openings (54) relative to said control slide (14), an electromagnetic rotary adjuster (13) within said piston for controlling said control slide for monitoring at least two flow cross sections, said electromagnetic rotary adjuster (13) is a permanently excited single-winding rotary adjuster having a maximum adjusting range of 30°, and a magnetic safety resetting.
Claim 3
Dependent Claim
29 words
A shock absorber as defined by claim 1, in which said electromagnetic rotary adjuster (13) includes a permanent-magnetic rotor (31), which given bipolar supply has two active torque directions.
Claim 4
Dependent Claim
30 words
A shock absorber as defined by claim 2, in which said permanent-magnetic rotor (31) is formed of a hollow-cylinder and has smooth, polished inner and outer jacket faces (47, 47').
Claim 5
Dependent Claim
49 words
A shock absorber as defined by claim 3, in which said electromagnetic rotary adjuster (13) includes a stator (30) that receives said rotor (31), said stator comprises individual plates and a single coil (40), said single coil is divided into two halves (41, 42), connected in a series circuit.
Claim 6
Dependent Claim
59 words
A shock absorber as defined by claim 4, in which said hollow-cylindercial permanent-magnetic rotor (31) of said electromagnetic rotary adjuster (13) receives a rotary adjuster shaft (26), which at its end has a rotary slide (48) of said control slide (14), and that said rotary adjuster shaft (26) is provided with a stop (27/28) for determining its rotational angle.
Claim 7
Dependent Claim
47 words
A shock absorber as defined by claim 5, in which said control slide (14) is inserted into a piston housing recess (12), and that said piston housing recess (12) has a hollow-cylindrical slide (53), into which the rotary slide (48) of said control slide (14) is received.
Claim 8
Dependent Claim
34 words
A shock absorber as defined by claim 3, in which said damper piston (7) has a recess (12), surrounded by a piston housing (11), into which recess the electromagnetic rotary adjuster (13) is inserted.
Claim 9
Dependent Claim
59 words
A shock absorber as defined by claim 7, in which said hollow-cylindercial permanent-magnetic rotor (31) of said electromagnetic rotary adjuster (13) receives a rotary adjuster shaft (26), which at its end has a rotary slide (48) of said control slide (14), and that said rotary adjuster shaft (26) is provided with a stop (27/28) for determining its rotational angle.
Claim 10
Dependent Claim
47 words
A shock absorber as defined by claim 8, in which said control slide (14) is inserted into a piston housing recess (12), and that said piston housing recess (12) has a hollow-cylindrical slide (53), into which the rotary slide (48) of said control slide (14) is received.
Claim 11
Dependent Claim
59 words
A shock absorber as defined by claim 3, in which said hollow-cylindercial permanent-magnetic rotor (31) of said electromagnetic rotary adjuster (13) receives a rotary adjuster shaft (26), which at its end has a rotary slide (48) of said control slide (14), and that said rotary adjuster shaft (26) is provided with a stop (27/28) for determining its rotational angle.
Claim 12
Dependent Claim
47 words
A shock absorber as defined by claim 10, in which said control slide (14) is inserted into a piston housing recess (12), and that said piston housing recess (12) has a hollow-cylindrical slide (53), into which the rotary slide (48) of said control slide (14) is received.
Claim 13
Dependent Claim
48 words
A shock absorber as defined by claim 11, in which shock absorber fluid is permitted to flow through the piston housing recess (12), the stator (30), and includes a gap between the rotary slide (48) and the slide (53) which determines a basic flow through the damper piston.
Claim 14
Dependent Claim
56 words
A shock absorber as defined by claim 11, which includes a position sensor (16) on said damper piston (7) for sensing the position of the rotary slide (48) with respect to said hollow cylindrical slide (53) at a given time and said position sensor (16) is inserted into an extension (15) of a piston housing (11).
Claim 15
Dependent Claim
53 words
A shock absorber as defined by claim 10, which includes a position sensor (16) on said damper piston (7) for sensing the position of the rotary slide (48) with respect to slide (53) at a given time and said position sensor (16) is inserted into an extension (15) of a piston housing (11).
Claim 16
Dependent Claim
46 words
A shock absorber as defined by claim 14, which includes an electronic control unit for self-regulation of the shock absorber, said position sensor (16) is disposed on the damper piston (7) and sends an actual-value signal through the piston rod (6) to said electronic control unit.
Claim 17
Dependent Claim
49 words
A shock absorber as defined by claim 2, in which said electromagnetic rotary adjuster (13) includes a stator (30) that receives said rotor (31), said stator comprises individual plates and a single coil (40), said single coil is divided into two halves (41, 42), connected in a series circuit.
Claim 18
Dependent Claim
37 words
A shock absorber as defined by claim 16, in which said permanent-magnetic rotor (31) of said electromagnetic rotary adjuster (13) has an outside diameter which is approximately equal to the outside diameter of said piston rod (6).
Claim 19
Dependent Claim
34 words
A shock absorber as defined by claim 2, in which said damper piston (7) has a recess (12), surrounded by a piston housing (11), into which recess the electromagnetic rotary adjuster (13) is inserted.
Claim 20
Dependent Claim
37 words
A shock absorber as defined by claim 18, in which said permanent-magnetic rotor (31) of said electromagnetic rotary adjuster (13) has an outside diameter which is approximately equal to the outside diameter of said piston rod (6).
Claim 21
Dependent Claim
37 words
A shock absorber as defined by claim 2, in which said permanent-magnetic rotor (31) of said electromagnetic rotary adjuster (13) has an outside diameter which is approximately equal to the outside diameter of said piston rod (6).
Claim 22
Dependent Claim
49 words
A shock absorber as defined by claim 1, in which said electromagnetic rotary adjuster (13) includes a stator (30) that receives a rotor (31), said stator comprises individual plates and a single coil (40), said single coil is divided into two halves (41, 42), connected in a series circuit.
Claim 23
Dependent Claim
34 words
A shock absorber as defined by claim 21, in which said damper piston (7) has a recess (12), surrounded by a piston housing (11), into which recess the electromagnetic rotary adjuster (13) is inserted.
Claim 24
Dependent Claim
34 words
A shock absorber as defined by claim 1, in which said damper piston (7) has a recess (12), surrounded by a piston housing (11), into which recess the electromagnetic rotary adjuster (13) is inserted.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |