US3859970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine retarder brake
Assignee: Deutz Allis Corp
•
Filing: 1973-01-22
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Granted: 1975-01-14
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Expires: 1993-01-22
Abstract
Abstract An engine retarder brake including a cam operated hydraulic actuator for operating a valve in the combustion chamber near the end of the compression stroke to discharge compressed air and operate the engine as a brake for the vehicle.
Inventors
- 👤 Alexander Dreisin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:41
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/14; F01L1/146; F01L13/00; F01L13/06; F01L9/00; F01L9/10; F02; F02D; F02D13/00; F02D13/02; F02D13/04; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
201 words
In an internal combustion engine having means for operating the engine as an engine brake comprising, a cam shaft comprising an exhaust valve cam and an auxiliary cam angularly spaced on said cam shaft, means defining a combustion chamber, a valve in said combustion chamber, a valve operating mechanism between said exhaust valve cam on said cam shaft and said valve for normally operating said valve in response to rotation of said cam shaft when said engine is operating as an engine, a hydraulic actuator in said mechanism defining a hydraulic actuator chamber, a hydraulic pump defining a pumping chamber connected to said actuator chamber in said hydraulic actuator for expanding said hydraulic actuator and operating said valve in said combustion chamber, said auxiliary cam on said cam shaft driving said pump and providing early opening of said exhaust valve, a hydraulic system having a source of pressurized fluid selectively connected to said pump for supplying hydraulic fluid to said pump, control valve means selectively connecting said hydraulic system to said pump and supplying fluid to said pump for operating said valve in said combustion chamber as said hydraulic actuator is expanded to thereby operate said engine as an engine brake.
Claim 2
Dependent Claim
201 words
In an internal combustion engine having means for operating the engine as an engine brake comprising, a cam shaft comprising an exhaust valve cam and an auxiliary cam angularly spaced on said cam shaft, means defining a combustion chamber, a valve in said combustion chamber, a valve operating mechanism between said exhaust valve cam on said cam shaft and said valve for normally operating said valve in response to rotation of said cam shaft when said engine is operating as an engine, a hydraulic actuator in said mechanism defining a hydraulic actuator chamber, a hydraulic pump defining a pumping chamber connected to said actuator chamber in said hydraulic actuator for expanding said hydraulic actuator and operating said valve in said combustion chamber, said auxiliary cam on said cam shaft driving said pump and providing early opening of said exhaust valve, a hydraulic system having a source of pressurized fluid selectively connected to said pump for supplying hydraulic fluid to said pump, control valve means selectively connecting said hydraulic system to said pump and supplying fluid to said pump for operating said valve in said combustion chamber as said hydraulic actuator is expanded to thereby operate said engine as an engine brake.
Claim 3
Dependent Claim
32 words
An internal combustion engine having means for operating the engine as an engine brake as set forth in claim 1 wherein said hydraulic system includes a lubricating oil system in said engine.
Claim 4
Dependent Claim
106 words
An internal combustion engine having means for operating the engine as an engine brake as set forth in claim 1 including a pressure release valve, means connecting said hydraulic system to normally close said pressure release valve in response to pressure in said hydraulic system when said pump is in operation, a relief passage connected between said pumping chamber of said pump and said pressure release valve to selectively release pressure from said pumping chamber, said release valve thereby retaining pressure in said pumping chamber when said pressure release valve is closed and releases pressure from said pumping chamber when said pressure release valve is open.
Claim 5
Dependent Claim
29 words
An internal combustion engine operating as an engine brake as set forth in claim 1 wherein said valve in said combustion chamber cOmprises an exhaust valve on said engine.
Claim 6
Dependent Claim
63 words
An internal combustion engine having means for operating the engine as an engine brake as set forth in claim 1 including a cam follower sleeve operated by said auxiliary cam means, an adjustable displacer piston received in said follower sleeve for calibrating the timing for initiating and terminating operation of said hydraulic pump for opening and closing said valve in the combustion chamber.
Claim 7
Dependent Claim
45 words
An internal combustion engine for operating an engine as an engine brake as set forth in claim 1 wherein said hydraulic pump includes a cam follower sleeve defining an orifice forming a drain passage from said pump when pressure is released from said hydraulic system.
Claim 8
Dependent Claim
84 words
An internal combustion engine having means for operating as an engine brake as set forth in claim 1 including a pressure release valve, means defining a chamber in said pressure release valve connected to said hydraulic system for biasing said valve to a closed position, vent passage means connecting said pumping chamber of said hydraulic pump through said pressure release valve to thereby relieve pressure in the pumping chamber of said hydraulic pump when the system pressure is relieved from said pressure release valve.
Claim 9
Dependent Claim
52 words
An internal combustion engine having means for operating the engine as an engine brake as set forth in claim 1 including an auxiliary cam on said cam shaft, an adjustable displacer piston in said hydraulic pump to calibrate the initiation of the pumping cycle for opening said valve in said combustion chamber.
Claim 10
Dependent Claim
48 words
An internal combustion engine having means for operating the engine as an engine brake as set forth in claim 1 including electrical means for opening said control valve for supplying pressurized fluid from said hydraulic system to said hydraulic pump to thereby initiate operation of said engine brake.
Claim 11
Dependent Claim
44 words
An internal combustion engine having means for operating the engine as an engine brake as set forth in claim 1 including hydraulic means for operating said control valve to connect said hydraulic system to said hydraulic pump for initiating operation of said engine brake.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |