Patent US3774734A successfully refreshed from Google Patents.
US3774734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodynamic brake for vehicles, especially motor vehicles
Assignee: Daimler Benz AG
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Filing: 1971-04-16
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Granted: 1973-11-27
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Expires: 1991-04-16
Abstract
Abstract A hydrodynamic brake for vehicles, especially for motor vehicles with at least one fixed blade wheel and one rotating blade wheel rotating with the drive of the vehicle, in which a filling pump for filling the hydrodynamic working circulatory system rotates also constantly with the drive; the filling pump is adapted to be connected by way of a regulating valve either with the oil sump or with the outlet of the hydrodynamic brake and the pressure is thereby automatically controllable corresponding to the pressure in the brake circuit of the vehicle; a closure valve is also associated with the brake which opens up the external circulatory sysem of the hydrodynamic brake only above a predetermined pressure at the inlet or outlet of the hydrodynamic brake and closes the same below the predetermined value.
Inventors
- 👤 H Forster
- 👤 W Zaiser
- 👤 H Hanke
- 👤 F Bultmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:45
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/78; F16D57/00; F16D57/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
185 words
A hydrodynamic brake for vehicles with a working circulatory system and with an external circulatory system as well as with at least one fixed blade wheel means and one rotatable blade wheel means operatively connected with a drive, which also includes a filling pump means for filling the hydrodynamic working circulatory system, characterized in that the hydrodynamic brake includes an inlet and an outlet, the filling pump means being operable to be selectively connected by way of a regulating valve with either an oil sump or the outlet of the hydrodynamic brake to fill the working circulatory system and to automatically regulate the pressure corresponding to the pressure in a brake circuit means of the vehicle, the external circulatory system being connected between the inlet and the outlet of the hydrodynamic brake and including a closure valve coordinated to the hydrodynamic brake for opening the external circulatory system of the hydrodynamic brake only above a predetermined pressure at one of the two places consisting of the inlet and the outlet of the hydrodynamic brake and for closing the external circulatory system below said predetermined value.
Claim 2
Dependent Claim
185 words
A hydrodynamic brake for vehicles with a working circulatory system and with an external circulatory system as well as with at least one fixed blade wheel means and one rotatable blade wheel means operatively connected with a drive, which also includes a filling pump means for filling the hydrodynamic working circulatory system, characterized in that the hydrodynamic brake includes an inlet and an outlet, the filling pump means being operable to be selectively connected by way of a regulating valve with either an oil sump or the outlet of the hydrodynamic brake to fill the working circulatory system and to automatically regulate the pressure corresponding to the pressure in a brake circuit means of the vehicle, the external circulatory system being connected between the inlet and the outlet of the hydrodynamic brake and including a closure valve coordinated to the hydrodynamic brake for opening the external circulatory system of the hydrodynamic brake only above a predetermined pressure at one of the two places consisting of the inlet and the outlet of the hydrodynamic brake and for closing the external circulatory system below said predetermined value.
Claim 3
Dependent Claim
58 words
A hydrodynamic brake according to claim 1, characterized in that the hydrodynamic brake is provided with a single outlet and the regulating valve is provided with an outlet connected to the outlet of the hydrodynamic brake such that the hydrodynamic brake is filled by fluid passing through the regulating valve and to the outlet of the hydrodynamic brake.
Claim 4
Dependent Claim
53 words
A hydrodynamic brake according to claim 2, characterized in that the regulating valve is provided with another outlet connected to the oil sump such that in one position of the regulating valve fluid passes from the oil sump via the filling pump means into the regulating valve and returns to the oil sump.
Claim 5
Dependent Claim
29 words
A hydrodynamic brake according to claim 3, characterized in that the filling pump means includes a pump having a single outlet connected to an inlet of the regulating valve.
Claim 6
Dependent Claim
156 words
A hydrodynamic brake for vehicles with a working circulatory system and with an external circulatory system as well as with at least one fixed blade wheel means and one rotatable blade wheel means operatively connected with a drive, which also includes a filling pump means for filling the hydrodynamic working circulatory system, characterized in that the filling pump means is operable to be selectively connected by way of a regulating valve means with either an oil sump or the outlet of the hydrodynamic brake to automatically regulate the pressure corresponding to the pressure in a brake circuit means of the vehicle, and in that a closure valve means is coordinated to the hydrodynamic brake which is operable to open up the external circulatory system of the hydrodynamic brake only above a predetermined pressure at one of the two places consisting of inlet and outlet of the hydrodynamic brake and closes the same below said predetermined value.
Claim 7
Dependent Claim
156 words
A hydrodynamic brake for vehicles with a working circulatory system and with an external circulatory system as well as with at least one fixed blade wheel means and one rotatable blade wheel means operatively connected with a drive, which also includes a filling pump means for filling the hydrodynamic working circulatory system, characterized in that the filling pump means is operable to be selectively connected by way of a regulating valve means with either an oil sump or the outlet of the hydrodynamic brake to automatically regulate the pressure corresponding to the pressure in a brake circuit means of the vehicle, and in that a closure valve means is coordinated to the hydrodynamic brake which is operable to open up the external circulatory system of the hydrodynamic brake only above a predetermined pressure at one of the two places consisting of inlet and outlet of the hydrodynamic brake and closes the same below said predetermined value.
Claim 8
Dependent Claim
17 words
A hydrodynamic brake according to claim 5, characterized in that the external circulatory system includeS a cooler.
Claim 9
Dependent Claim
18 words
A hydrodynamic brake according to claim 6, characterized in that the brake is installed in a motor vehicle.
Claim 10
Dependent Claim
47 words
A hydrodynamic brake according to claim 5, characterized in that said closure valve means is coordinated to the inlet in the brake and is adapted to be acted upon, on the one hand, by a spring force and, on the other, by the pressure at said inlet.
Claim 11
Dependent Claim
17 words
A hydrodynamic brake according to claim 8, characterized in that the external circulatory system includes a cooler.
Claim 12
Dependent Claim
88 words
A hydrodynamic brake according to claim 9, characterized in that the closure valve means is constructed as piston slide valve, with two partial pistons, and in that a spring is disposed at the end face of one partial piston which closes a line from the cooler in the pressureless condition whereas the end face of the other partial piston is in communication by way of a throttle bore with the space between the two partial pistons which is in constant communication with the inlet of the hydrodynamic brake.
Claim 13
Dependent Claim
74 words
A hydrodynamic brake according to claim 5, characterized in that the regulating valve means is constructed as piston slide valve and includes a first partial piston adapted to be acted upon by a pressure depending on the pressure in the vehicle brake circuit means, a second partial piston controlling the return into the sump and a third partial piston adapted to be acted upon by the pressure at the outlet of the hydrodynamic brake.
Claim 14
Dependent Claim
35 words
A hydrodynamic brake according to claim 11, characterized in that the effective piston surface of the first partial piston of said regulating valve means possesses a differential surface with respect to the third partial piston.
Claim 15
Dependent Claim
40 words
A hydrodynamic brake according to claim 11, characterized in that a spring means is so coordinated to the first partial piston of said regulating valve means that a slight pressure is constantly maintained at the outlet of the hydrodynamic brake.
Claim 16
Dependent Claim
46 words
A hydrodynamic brake according to claim 11, characterized in that a bore means is so coordinated to the space on the end face of the third partial piston that it is adapted to be closed after traversal of a predetermined path by the third partial piston.
Claim 17
Dependent Claim
45 words
A hydrodynamic brake according to claim 11, characterized in that a spring loaded additional piston is arranged in the space on the end face of the third partial piston and in that the space disposed opposite to the third partial piston is discharged to zero.
Claim 18
Dependent Claim
57 words
A hydrodynamic brake according to claim 5, characterized in that the closure valve means is coordinated to the inlet of the hydrodynamic brake and is adapted to be acted upon against a spring force by the pressure existing at one of the two places consisting of a cooler outlet and of the outlet of the hydrodynamic brake.
Claim 19
Dependent Claim
57 words
A hydrodynamic brake according to claim 16, characterized in that the closure valve means is constructed as piston slide valve with two partial pistons whose one partial piston closes the inlet to the brake and whose other partial piston is adapted to be acted upon by the pressure at the cooler outlet by way of a bore.
Claim 20
Dependent Claim
74 words
A hydrodynamic brake according to claim 17, characterized in that the regulating valve means is constructed as piston slide valve and includes a first partial piston adapted to be acted upon by a pressure depending on the pressure in the vehicle brake circuit means, a second partial piston controlling the return into the sump and a third partial piston adapted to be acted upon by the pressure at the outlet of the hydrodynamic brake.
Claim 21
Dependent Claim
35 words
A hydrodynamic brake according to claim 18, characterized in that the effective piston surface of the first partial piston of said regulating valve means possesses a differential surface with respect to the third partial piston.
Claim 22
Dependent Claim
40 words
A hydrodynamic brake according to claim 19, characterized in that a spring means is so coordinated to the first partial piston of said regulating valve means that a slight pressure is constantly maintained at the outLet of the hydrodynamic brake.
Claim 23
Dependent Claim
46 words
A hydrodynamic brake according to claim 20, characterized in that a bore means is so coordinated to the space on the end face of the third partial piston that it is adapted to be closed after traversal of a predetermined path by the third partial piston.
Claim 24
Dependent Claim
44 words
A hydrodynamic brake according to claim 20, characterized in that a spring-loaded additional piston is arranged in the space on the end face of the third partial piston and in that the space disposed opposite to the third partial piston is discharged to zero.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |