Patent US4601368A successfully refreshed from Google Patents.
US4601368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infinitely variable ratio transmission
Assignee: Bosch Transmission Technology BV
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Filing: 1982-08-25
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Granted: 1986-07-22
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Expires: 2002-08-25
Abstract
Abstract A transmission, in particular for a motor vehicle, includes an infinitely variable V-belt transmission with a primary pulley having a primary shaft and a secondary pulley, each having two conical sheaves, a primary and a secondary hydraulic operating cylinder, respectively, for the axial displacement of at least one of the conical sheaves of each pulley, a hydraulic control valve for the control of the transmission ratio, the valve having a housing and an internal valve spool that can be displaced from an end position in which the valve spool rests against a stop and the valve housing having ports openable for the discharge of fluid from the primary operating cylinder and/or the supply of fluid to the secondary operating cylinder, to a center position where ports are substantially closed, so that virtually no supply of fluid to and discharge of fluid from at least one of the operating cylinders can take place, a hydrodynamic transmission unit having a rotary output member connected to said primary shaft and a rotary input member adapted to be driven by a power source, a lock-up device for locking the input and output members together and a lock-up control device responsive to the position of the valve spool between the end position and the center position.
Inventors
- 👤 Petrus H. VAN Deursen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:56
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/065; F16H61/00; F16H61/14; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0206; F16H2061/0209; F16H61/66; F16H61/662; F16H61/66254; F16H61/66263
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
198 words
A transmission comprising a hydrodynamic transmission unit connected to the input shaft of a variable ratio V-belt transmission unit, the hydrodynamic transmission unit including a hydrodynamically actuated lock-up means operative to lock the hydrodynamic transmission unit in a direct-driver mode, the V-belt transmission having a fluid pressure cylinder which controls the axial position of a conical pulley disc forming part of the V-belt transmission to control the ratio of input to output, a hydraulic control valve for the control of the flow of fluid from a pump to and from said fluid pressure cylinder, the hydraulic control valve comprising a housing having a reciprocable internal valve spool which can be displaced from an end position in which the valve spool rests against a stop to a second position thereby closing ports of fluid lines leading to the fluid pressure cylinder, the hydrodynamically actuated lock-up means being directly connected to the fluid pump by a fluid duct including a second valve means operated by a control means responsive to the position of the valve spool such that only slight movement of the valve spool actuates the lock-up means before any change in the ratio of the transmission takes place.
Claim 2
Dependent Claim
198 words
A transmission comprising a hydrodynamic transmission unit connected to the input shaft of a variable ratio V-belt transmission unit, the hydrodynamic transmission unit including a hydrodynamically actuated lock-up means operative to lock the hydrodynamic transmission unit in a direct-driver mode, the V-belt transmission having a fluid pressure cylinder which controls the axial position of a conical pulley disc forming part of the V-belt transmission to control the ratio of input to output, a hydraulic control valve for the control of the flow of fluid from a pump to and from said fluid pressure cylinder, the hydraulic control valve comprising a housing having a reciprocable internal valve spool which can be displaced from an end position in which the valve spool rests against a stop to a second position thereby closing ports of fluid lines leading to the fluid pressure cylinder, the hydrodynamically actuated lock-up means being directly connected to the fluid pump by a fluid duct including a second valve means operated by a control means responsive to the position of the valve spool such that only slight movement of the valve spool actuates the lock-up means before any change in the ratio of the transmission takes place.
Claim 3
Dependent Claim
193 words
A transmission comprising a variable ratio V-belt transmission unit having an input and output shaft, a hydrodynamic transmission unit connected to the input shaft of the V-belt transmission, the hydrodynamic transmission having a hydrodynamically actuated lock-up means operative to lock the transmission in a direct drive mode, the V-belt transmission having a variable width pulley on the input and output shafts, the pulleys having conical sheaves which are axially displaceable by a fluid pressure cylinder, a first hydraulic control valve for controlling the flow of fluid from a pump through lines to the fluid pressure cylinder, the hydraulic control valve comprising a housing containing a reciprocatable internal valve spool which can be displaced from a first end position where the spool rests against a stop to a second postion where the fluid lines are closed, the hydrodynamically actuated lock-up means being directly connected to the fluid pump by a fluid duct, said duct including a second valve means responsive to the displacement of the spool from the end position such that only slight movement of the valve spool activates the lock-up means before any change in the ratio of the transmission takes place.
Claim 4
Dependent Claim
193 words
A transmission comprising a variable ratio V-belt transmission unit having an input and output shaft, a hydrodynamic transmission unit connected to the input shaft of the V-belt transmission, the hydrodynamic transmission having a hydrodynamically actuated lock-up means operative to lock the transmission in a direct drive mode, the V-belt transmission having a variable width pulley on the input and output shafts, the pulleys having conical sheaves which are axially displaceable by a fluid pressure cylinder, a first hydraulic control valve for controlling the flow of fluid from a pump through lines to the fluid pressure cylinder, the hydraulic control valve comprising a housing containing a reciprocatable internal valve spool which can be displaced from a first end position where the spool rests against a stop to a second postion where the fluid lines are closed, the hydrodynamically actuated lock-up means being directly connected to the fluid pump by a fluid duct, said duct including a second valve means responsive to the displacement of the spool from the end position such that only slight movement of the valve spool activates the lock-up means before any change in the ratio of the transmission takes place.
Claim 5
Dependent Claim
37 words
A transmission according to claim 1 wherein said second valve is an electrically operated valve connected to a contact device within the housing of the hydraulic control valve which contacts the spool when in the end position.
Claim 6
Dependent Claim
45 words
A transmission according to claim 2 wherein the second valve means is integral with the spool and housing of the hydraulic control valve and separate from the portion of the hydraulic control valve which governs fluid flow to the pressure cylinder of the pulley disc.
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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) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |