US3749209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodynamic braking system for applying an impact-free braking torque to a rotating member
Assignee: Voith Getriebe KG
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Filing: 1971-04-30
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Granted: 1973-07-31
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Expires: 1991-04-30
Abstract
Abstract In a hydrodynamic machine, to effect a rapid, yet impact-free braking of a rotating shaft, there is provided a braking system which includes a coupling means to connect the brake rotor of the hydrodynamic machine to said shaft. The coupling means includes a stepped brake piston having a small work face and a hydraulically separate large work face. In the first phase of the braking operation, the piston is rapidly actuated by exerting on said small work face a pressure generated by a continuously operated auxiliary pump. In the second phase of the braking operation, the said large work face of the stepped piston is exposed to a pressure which corresponds to the momentary outlet pressure of the hydrodynamic machine and which may be set by an arbitrarily controllable device forming part of said braking system.
Inventors
- 👤 Hellmut Weinrich
- 👤 Johannes Peltner
- 👤 Friedrich Helfer
- 👤 Heinrich Dick
- 👤 Fritz Haeberle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:54
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08; F16H47/085; F16H41/00; F16H41/04
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
396 words
In a hydrodynamic braking system of the type that includes (a) a hydrodynamic machine having a toroidal work chamber in which an outlet pressure is generated and a brake rotor, (b) a shaft to be braked, (c) coupling means for connecting said shaft to said brake rotor and (d) an auxiliary pump for delivering hydraulic liquid under pressure for operating and controlling said system, the improvement in said coupling means comprising, A. frictionally engageable means for transmitting a torque between said shaft and said brake rotor as a function of the extent of the frictional engagement, B. a reciprocable piston for effecting said frictional engagement, said piston having first and second work faces hydraulically separated from one another, C. first hydraulic conduit means for connecting said auxiliary pump with said first work face of said piston to expose said first work face to hydraulic pressure urging said piston in the direction of said frictionally engageable means, D. second hydraulic conduit means for connecting said work chamber of said hydrodynamic machine with said second work face of said piston to expose said second work face to said outlet pressure urging said piston in the direction of said frictionally engageable means, E. control means for controlling the admission of pressure to said first and second work faces of said piston, said control means including 1. a pressure limiting valve contained in said second hydraulic conduit means for affecting The magnitude of said outlet pressure, 2. arbitrarily adjustable means for setting the regulating force of said pressure limiting valve, said arbitrarily adjustable means including a. a spring forming part of said pressure limiting valve for supplying said regulating force as a function of the magnitude of bias of the spring, b. a displaceable auxiliary piston operatively connected to said spring for changing the bias thereof, c. means for admitting hydraulic pressure to said auxiliary piston for causing displacement thereof to change the bias of said spring, F. a hydraulic pressure source, G. a hydraulic cylinder containing said auxiliary piston, H. third conduit means for connecting said hydraulic pressure source to said hydraulic cylinder for applying a displacing force to said auxiliary piston, I. a pressure-regulating valve contained in said third circuit means and J. electromagnet means associated with said pressure-regulating valve for the control of the latter, said electromagnet means including means for varying the magnetic force generated thereby.
Claim 2
Dependent Claim
396 words
In a hydrodynamic braking system of the type that includes (a) a hydrodynamic machine having a toroidal work chamber in which an outlet pressure is generated and a brake rotor, (b) a shaft to be braked, (c) coupling means for connecting said shaft to said brake rotor and (d) an auxiliary pump for delivering hydraulic liquid under pressure for operating and controlling said system, the improvement in said coupling means comprising, A. frictionally engageable means for transmitting a torque between said shaft and said brake rotor as a function of the extent of the frictional engagement, B. a reciprocable piston for effecting said frictional engagement, said piston having first and second work faces hydraulically separated from one another, C. first hydraulic conduit means for connecting said auxiliary pump with said first work face of said piston to expose said first work face to hydraulic pressure urging said piston in the direction of said frictionally engageable means, D. second hydraulic conduit means for connecting said work chamber of said hydrodynamic machine with said second work face of said piston to expose said second work face to said outlet pressure urging said piston in the direction of said frictionally engageable means, E. control means for controlling the admission of pressure to said first and second work faces of said piston, said control means including 1. a pressure limiting valve contained in said second hydraulic conduit means for affecting The magnitude of said outlet pressure, 2. arbitrarily adjustable means for setting the regulating force of said pressure limiting valve, said arbitrarily adjustable means including a. a spring forming part of said pressure limiting valve for supplying said regulating force as a function of the magnitude of bias of the spring, b. a displaceable auxiliary piston operatively connected to said spring for changing the bias thereof, c. means for admitting hydraulic pressure to said auxiliary piston for causing displacement thereof to change the bias of said spring, F. a hydraulic pressure source, G. a hydraulic cylinder containing said auxiliary piston, H. third conduit means for connecting said hydraulic pressure source to said hydraulic cylinder for applying a displacing force to said auxiliary piston, I. a pressure-regulating valve contained in said third circuit means and J. electromagnet means associated with said pressure-regulating valve for the control of the latter, said electromagnet means including means for varying the magnetic force generated thereby.
Claim 3
Dependent Claim
153 words
arbitrarily adjustable means for setting the regulating force of said pressure limiting valve, said arbitrarily adjustable means including a. a spring forming part of said pressure limiting valve for supplying said regulating force as a function of the magnitude of bias of the spring, b. a displaceable auxiliary piston operatively connected to said spring for changing the bias thereof, c. means for admitting hydraulic pressure to said auxiliary piston for causing displacement thereof to change the bias of said spring, F. a hydraulic pressure source, G. a hydraulic cylinder containing said auxiliary piston, H. third conduit means for connecting said hydraulic pressure source to said hydraulic cylinder for applying a displacing force to said auxiliary piston, I. a pressure-regulating valve contained in said third circuit means and J. electromagnet means associated with said pressure-regulating valve for the control of the latter, said electromagnet means including means for varying the magnetic force generated thereby.
Claim 4
Dependent Claim
153 words
arbitrarily adjustable means for setting the regulating force of said pressure limiting valve, said arbitrarily adjustable means including a. a spring forming part of said pressure limiting valve for supplying said regulating force as a function of the magnitude of bias of the spring, b. a displaceable auxiliary piston operatively connected to said spring for changing the bias thereof, c. means for admitting hydraulic pressure to said auxiliary piston for causing displacement thereof to change the bias of said spring, F. a hydraulic pressure source, G. a hydraulic cylinder containing said auxiliary piston, H. third conduit means for connecting said hydraulic pressure source to said hydraulic cylinder for applying a displacing force to said auxiliary piston, I. a pressure-regulating valve contained in said third circuit means and J. electromagnet means associated with said pressure-regulating valve for the control of the latter, said electromagnet means including means for varying the magnetic force generated thereby.
Claim 5
Dependent Claim
388 words
In a hydraulic braking system of the type that includes (a) a hydrodynamic converter forming part of the power plant of a vehicle, said converter having a toroidal work chamber in which an outlet pressure is generated and a brake rotor, (b) a shaft to be braked, (c) coupling means for connecting said shaft to said brake rotor and (d) an auxiliary pump for delivering hydraulic liquid under pressure for operating and controlling said system, the improvement in said coupling means comprising, A. frictionally engageable means for transmitting a torque between said shaft and said brake rotor as a function of the extent of the frictional engagement, B. a reciprocable piston for effecting said frictional engagement, said piston having first and second work faces hydraulically separated from one another, C. first hydraulic conduit means for connecting said auxiliary pump with said first work face of said piston to expose said first work face to hydraulic pressure urging said piston in the direction of said frictionally engageable means, D. second hydraulic conduit means for connecting said work chamber of said hydrodynamic converter with said second work face of said piston to expose said second work face to said outlet pressure urging said piston in the direction of said frictionally engageable means, E. control means for controlling the admission of pressure to said first and second work faces of said piston, F. a first vane wheel formed as the pump wheel of said hydrodynamic converter, G. a differential gearing connecting an output shaft of a vehicle engine forming part of said power plant to said pump wheel for transmitting a torque thereto in a first, hydrodynamic power path, H. mechanic means connected to said differential gearing for receiving a torque from said engine in a second mechanic power path, I. a second vane wheel constituting said brake rotor and also constituting the turbine wheel of said converter, J. a converter output shaft connected to said second vane wheel, K. an output member constituting said shaft to be braked; said output member connected to said converter output shaft and to said mechanic means for reuniting said first and second power paths, L. means operable at will for braking said pump wheel, M. a reversing gear means connected between said converter output shaft and said output member; said reversing gear means including
Claim 6
Dependent Claim
388 words
In a hydraulic braking system of the type that includes (a) a hydrodynamic converter forming part of the power plant of a vehicle, said converter having a toroidal work chamber in which an outlet pressure is generated and a brake rotor, (b) a shaft to be braked, (c) coupling means for connecting said shaft to said brake rotor and (d) an auxiliary pump for delivering hydraulic liquid under pressure for operating and controlling said system, the improvement in said coupling means comprising, A. frictionally engageable means for transmitting a torque between said shaft and said brake rotor as a function of the extent of the frictional engagement, B. a reciprocable piston for effecting said frictional engagement, said piston having first and second work faces hydraulically separated from one another, C. first hydraulic conduit means for connecting said auxiliary pump with said first work face of said piston to expose said first work face to hydraulic pressure urging said piston in the direction of said frictionally engageable means, D. second hydraulic conduit means for connecting said work chamber of said hydrodynamic converter with said second work face of said piston to expose said second work face to said outlet pressure urging said piston in the direction of said frictionally engageable means, E. control means for controlling the admission of pressure to said first and second work faces of said piston, F. a first vane wheel formed as the pump wheel of said hydrodynamic converter, G. a differential gearing connecting an output shaft of a vehicle engine forming part of said power plant to said pump wheel for transmitting a torque thereto in a first, hydrodynamic power path, H. mechanic means connected to said differential gearing for receiving a torque from said engine in a second mechanic power path, I. a second vane wheel constituting said brake rotor and also constituting the turbine wheel of said converter, J. a converter output shaft connected to said second vane wheel, K. an output member constituting said shaft to be braked; said output member connected to said converter output shaft and to said mechanic means for reuniting said first and second power paths, L. means operable at will for braking said pump wheel, M. a reversing gear means connected between said converter output shaft and said output member; said reversing gear means including
Claim 7
Dependent Claim
70 words
a planetary gearing for reverse travel having a hollow wheel, N. a first brake means associated with said planetary gearing for forward travel for braking the hollow wheel associated therewith and O. a second brake means associated with said planetary gearing for reverse travel for braking the hollow wheel associated Therewith, said second brake means constituting said coupling means for connecting said shaft to be braked to said brake motor.
Claim 8
Dependent Claim
70 words
a planetary gearing for reverse travel having a hollow wheel, N. a first brake means associated with said planetary gearing for forward travel for braking the hollow wheel associated therewith and O. a second brake means associated with said planetary gearing for reverse travel for braking the hollow wheel associated Therewith, said second brake means constituting said coupling means for connecting said shaft to be braked to said brake motor.
Claim 9
Dependent Claim
71 words
means connected to said first and second hydraulic conduit means and to said starting means for simultaneously establishing hydraulic communication between said auxiliary pump and said first work face of said piston through said first hydraulic conduit means and between said work chamber of said hydrodynamic machine and said second work face of said piston through said second hydraulic conduit means when said starting means assumes its said actuating position and
Claim 10
Dependent Claim
71 words
means connected to said first and second hydraulic conduit means and to said starting means for simultaneously establishing hydraulic communication between said auxiliary pump and said first work face of said piston through said first hydraulic conduit means and between said work chamber of said hydrodynamic machine and said second work face of said piston through said second hydraulic conduit means when said starting means assumes its said actuating position and
Claim 11
Dependent Claim
162 words
arbitrarily adjustable means for setting the regulating force of said pressure limiting valve, said arbitrarily adjustable means including a. a spring forming part of said pressure limiting valve for supplying said regulating force as a function of the magnitude of bias of the spring, b. a displaceable auxiliary piston operatively connected to said spring for changing the bias thereof, c. means for admitting hydraulic pressure to said auxiliary piston for causing displacement thereof to change the bias of said spring, F. a hydraulic pressure source, G. a hydraulic cylinder containing said auxiliary piston, H. third conduit means for connecting said hydraulic pressure source to said hydraulic cylinder for applying a displacing force to said auxiliary piston I. an on-off solenoid valve contained in said third conduit means for establishing and interrupting communication between said pressure source and said hydraulic cylinder, J. an electric current source and K. means for connecting said solenoid valve to, and disconnecting it from, said electric current source.
Claim 12
Dependent Claim
162 words
arbitrarily adjustable means for setting the regulating force of said pressure limiting valve, said arbitrarily adjustable means including a. a spring forming part of said pressure limiting valve for supplying said regulating force as a function of the magnitude of bias of the spring, b. a displaceable auxiliary piston operatively connected to said spring for changing the bias thereof, c. means for admitting hydraulic pressure to said auxiliary piston for causing displacement thereof to change the bias of said spring, F. a hydraulic pressure source, G. a hydraulic cylinder containing said auxiliary piston, H. third conduit means for connecting said hydraulic pressure source to said hydraulic cylinder for applying a displacing force to said auxiliary piston I. an on-off solenoid valve contained in said third conduit means for establishing and interrupting communication between said pressure source and said hydraulic cylinder, J. an electric current source and K. means for connecting said solenoid valve to, and disconnecting it from, said electric current source.
Claim 13
Dependent Claim
41 words
means for pressurizing said second face of said piston by the pressure generated in said work chamber with an automatic delay with respect to the pressurization of said first face of said piston by the pressure generated by said auxiliary pump.
Claim 14
Dependent Claim
41 words
means for pressurizing said second face of said piston by the pressure generated in said work chamber with an automatic delay with respect to the pressurization of said first face of said piston by the pressure generated by said auxiliary pump.
Claim 15
Dependent Claim
62 words
An improvement as defined in claim 2, wherein said control means includes a pressure limiting valve contained in said second hydraulic conduit means for affecting the magnitude of said outlet pressure; said improvement further includes a device connected to said pressure limiting valve for setting the latter to a maximum value of said outlet pressure during output torque transmission of said converter.
Claim 16
Dependent Claim
222 words
In a hydrodynamic braking system of the type that includes (a) a hydrodynamic machine having a toroidal work chamber in which an outlet pressure is generated and a brake rotor, (b) a shaft to be braked, (c) coupling means for connecting said shaft to said brake rotor and (d) an auxiliary pump for delivering hydraulic liquid under pressure for operating and controlling said system, the improvement in said coupling means comprising, A. frictionally engageable means for transmitting a torque between said shaft and said brake rotor as a function of the extent of the frictional engagement, B. a reciprocable piston for effecting said frictional engagement, said piston having first and second work faces hydraulically separated from one another, C. first hydraulic conduit means for connecting said auxiliary pump with said first work face of said piston to expose said first work face to hydraulic pressure urging said piston in the direction of said frictionally engageable means, D. second hydraulic conduit means for connecting said work chamber of said hydrodynamic machine with said second work face of said piston to expose said second work face to said outlet pressure urging said piston in the direction of said frictionally engageable means, E. control means for controlling the admission of pressure to said first and second work faces of said piston, said control means including
Claim 17
Dependent Claim
222 words
In a hydrodynamic braking system of the type that includes (a) a hydrodynamic machine having a toroidal work chamber in which an outlet pressure is generated and a brake rotor, (b) a shaft to be braked, (c) coupling means for connecting said shaft to said brake rotor and (d) an auxiliary pump for delivering hydraulic liquid under pressure for operating and controlling said system, the improvement in said coupling means comprising, A. frictionally engageable means for transmitting a torque between said shaft and said brake rotor as a function of the extent of the frictional engagement, B. a reciprocable piston for effecting said frictional engagement, said piston having first and second work faces hydraulically separated from one another, C. first hydraulic conduit means for connecting said auxiliary pump with said first work face of said piston to expose said first work face to hydraulic pressure urging said piston in the direction of said frictionally engageable means, D. second hydraulic conduit means for connecting said work chamber of said hydrodynamic machine with said second work face of said piston to expose said second work face to said outlet pressure urging said piston in the direction of said frictionally engageable means, E. control means for controlling the admission of pressure to said first and second work faces of said piston, said control means including
Claim 18
Dependent Claim
52 words
An improvement as defined in claim 4, wherein the last-named means includes a hydraulically operated switch having A. a switch-actuating reciprocable piston, B. a spring exerting a force on said switch-actuating piston in the switch-closing direction and C. means for exposing said switch-actuating piston to said outlet pressure in the switch-operating direction.
Claim 19
Dependent Claim
30 words
An improvement as defined in claim 5, wherein the last-named means includes a fourth hydraulic conduit means for connecting said switch-actuating piston to said work chamber of said hydrodynamic machine.
Claim 20
Dependent Claim
223 words
In a hydrodynamic braking system of the type that includes (a) a hydrodynamic machine having a toroidal work chamber in which an outlet pressure is generated and a brakE rotor, (b) a shaft to be braked, (c) coupling means for connecting said shaft to said brake rotor and (d) an auxiliary pump for delivering hydraulic liquid under pressure for operating and controlling said system, the improvement in said coupling means comprising, A frictionally engageable means for transmitting a torque between said shaft and said brake rotor as a function of the extent of the frictional engagement, B a reciprocable piston for effecting said frictional engagement, said piston having first and second work faces hydraulically separated from one another, C first hydraulic conduit means for connecting said auxiliary pump with said first work face of said piston to expose said first work face to hydraulic pressure urging said piston in the direction of said frictionally engageable means, D second hydraulic conduit means for connecting said work chamber of said hydrodynamic machine with said second work face of said piston to expose said second work face to said outlet pressure urging said piston in the direction of said frictionally engageable means and E control means for controlling the admission of pressure to said first and second work faces of said piston, said control means including
Claim 21
Dependent Claim
223 words
In a hydrodynamic braking system of the type that includes (a) a hydrodynamic machine having a toroidal work chamber in which an outlet pressure is generated and a brakE rotor, (b) a shaft to be braked, (c) coupling means for connecting said shaft to said brake rotor and (d) an auxiliary pump for delivering hydraulic liquid under pressure for operating and controlling said system, the improvement in said coupling means comprising, A frictionally engageable means for transmitting a torque between said shaft and said brake rotor as a function of the extent of the frictional engagement, B a reciprocable piston for effecting said frictional engagement, said piston having first and second work faces hydraulically separated from one another, C first hydraulic conduit means for connecting said auxiliary pump with said first work face of said piston to expose said first work face to hydraulic pressure urging said piston in the direction of said frictionally engageable means, D second hydraulic conduit means for connecting said work chamber of said hydrodynamic machine with said second work face of said piston to expose said second work face to said outlet pressure urging said piston in the direction of said frictionally engageable means and E control means for controlling the admission of pressure to said first and second work faces of said piston, said control means including
Claim 22
Dependent Claim
27 words
An improvement as defined in claim 7, wherein the area of said first work face of said piston is smaller than that of said second work face.
Claim 23
Dependent Claim
98 words
An improvement as defined in claim 7, wherein said hydrodynamic machine is formed as a hydrodynamic brake having a bladed brake rotor and a bladed brake stator, the rotor and the stator defining said toroidal work chamber; the improvement further includes a planetary gearing having first, second and third gear members; said first gear member is fixedly connected with said brake rotor, said second gear member is fixedly connected with said shaft to be braked and said third gear member, constituting said frictionally engageable means, is disposed within the operating range of said piston and is brakable thereby.
Claim 24
Dependent Claim
71 words
An improvement as defined in claim 7, wherein said control means further includes A. a pressure limiting valve contained in said second hydraulic conduit means for affecting the magnitude of said outlet pressure, B. arbitrarily adjustable means for setting the regulating force of said pressure limiting valve and C. means defining an inlet opening in said work chamber of said hydrodynamic machine for permitting admission of air into said work chamber.
Claim 25
Dependent Claim
37 words
An improvement as defined in claim 10, wherein said arbitrarily adjustable means includes means for setting said force to a value corresponding to the value of smallest outlet pressure when no transmission of said torque takes place.
Claim 26
Dependent Claim
33 words
An improvement as defined in claim 10, wherein said arbitrarily adjustable means includes an electromagnet having means for varying the magnetic force generated thereby; said regulating force is adjusted by said magnetic force.
Claim 27
Dependent Claim
76 words
An improvement as defined in claim 10, wherein said arbitrarily adjustable means includes A. a spring forming part of said pressure limiting valvE for supplying said regulating force as a function of the magnitude of bias of the spring, B. a displaceable auxiliary piston operatively connected to said spring for changing the bias thereof and C. means for admitting hydraulic pressure to said auxiliary piston for causing displacement thereof to change the bias of said spring.
Claim 28
Dependent Claim
68 words
An improvement as defined in claim 13, including A. a hydraulic pressure source, B. a hydraulic cylinder containing said auxiliary piston, C. third conduit means for connecting said hydraulic pressure source to said hydraulic cylinder for applying a displacing force to said auxiliary piston and D. an on-off valve contained in said third conduit means for establishing and interrupting communication between said pressure source and said hydraulic cylinder.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |