Patent US3841093A successfully refreshed from Google Patents.
US3841093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise reduction apparatus and method
Assignee: Sargent Industries Inc
•
Filing: 1973-09-27
•
Granted: 1974-10-15
•
Expires: 1993-09-27
Abstract
Abstract An apparatus and method for operating an auxiliary hydraulic load at low noise levels. A pump having a capacity which is sufficiently large to supply the load with the necessary volume of hydraulic fluid at relatively low pump speeds is driven by an engine operating at a speed near its idling speed. Throttle control means control the fuel supply to the engine at a level sufficient to drive the pump while maintaining the engine speed near its idling speed. When the engine speed is increased to a predetermined level in excess of its idling speed, means are provided to maintain the output from the pump at or below a predetermined flow rate to not overload the pump means or the auxiliary load. The pump may include a variable displacement pump or a plurality of fixed displacement pumps with means to vary the pump output in response to the pressure demand from the auxiliary load to maintain the torque input requirements for the pump below a predetermined level. The throttle control means may be actuated in response to the pressure demands of the auxiliary load to vary the torque from the engine in response to the torque input required for operation of the pump while the engine is operating at a speed near its idling speed.
Inventors
- 👤 F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:21
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/465; B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B65; B65F; B65F3/00; G; G10; G10K; G10K11/00; G10K11/16; B60Y; B60Y2200/00; B60Y2200/10; B60Y2200/14; B60Y2200/144
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A method of reducing noise, including the following steps: providing for the operation of an auxiliary mechanism on a vehicle where the mechanism provides an operation different from propulsion of the vehicle, regulating the speed of an engine in the vehicle at speeds near its idling speed during the operation of the auxiliary mechanism, using the power from the engine at speeds near its idling speed to supply a fluid under pressure for operating the auxiliary mechanism, and introducing the fluid under pressure to the auxiliary mechanism to operate the auxiliary mechanism.
Claim 2
Independent Claim
92 words
A method of reducing noise, including the following steps: providing for the operation of an auxiliary mechanism on a vehicle where the mechanism provides an operation different from propulsion of the vehicle, regulating the speed of an engine in the vehicle at speeds near its idling speed during the operation of the auxiliary mechanism, using the power from the engine at speeds near its idling speed to supply a fluid under pressure for operating the auxiliary mechanism, and introducing the fluid under pressure to the auxiliary mechanism to operate the auxiliary mechanism.
Claim 3
Dependent Claim
37 words
The method set forth in claim 1, including the following step: inhibiting the introduction of fluid under pressure to the auxiliary mechanism when the engine is operated at a particular speed in excess of its idling speed.
Claim 4
Dependent Claim
42 words
The method set forth in claim 1, including the following step of: controlling the introduction of fluid under pressure to the auxiliary mechanism when the engine is operated at speeds having an intermediate value between its idling speed and the particular speed.
Claim 5
Independent Claim
118 words
A method for operating an auxiliary hydraulic load having variable volume and pressure requirements at a low noise level, said method comprising: providing a pump whose capacity is sufficient to satisfy the auxiliary hydraulic load having the variable volume and pressure requirements; driving the pump with an engine operating at a speed near its idling speed; conducting hydraulic fluid from the pump to the auxiliary hydraulic load having the variable volume and pressure requirements, and varying the volume of fluid discharged from the pump in response to the pressure demands of the auxiliary hydraulic load to maintain the maximum torque input requirements of the pump at a level which is compatible with the torque output of the engine.
Claim 6
Independent Claim
118 words
A method for operating an auxiliary hydraulic load having variable volume and pressure requirements at a low noise level, said method comprising: providing a pump whose capacity is sufficient to satisfy the auxiliary hydraulic load having the variable volume and pressure requirements; driving the pump with an engine operating at a speed near its idling speed; conducting hydraulic fluid from the pump to the auxiliary hydraulic load having the variable volume and pressure requirements, and varying the volume of fluid discharged from the pump in response to the pressure demands of the auxiliary hydraulic load to maintain the maximum torque input requirements of the pump at a level which is compatible with the torque output of the engine.
Claim 7
Dependent Claim
54 words
The method of claim 4 including the step of: varying the fuel supply to the engine in response to the volume of fluid discharged from the pump and the pressure demands of the auxiliary hydraulic load to provide an engine output torque which is compatible with the input torque required to drive the pump.
Claim 8
Dependent Claim
32 words
The method of claim 4 wherein the pump is a variable displacement pump and the displacement of the pump is varied in response to the pressure demands of the auxiliary hydraulic load.
Claim 9
Dependent Claim
40 words
The method of claim 4 including the use of a plurality of fixed displacement pumps and varying the number of pumps discharging hydraulic fluid to the auxiliary hydraulic load in response to the pressure demands of the auxiliary hydraulic load.
Claim 10
Dependent Claim
36 words
The method of claim 4 including the step of controlling the flow rate of hydraulic fluid discharged to the auxiliary hydraulic load at a level which does not exceed the capacity of the auxiliary hydraulic load.
Claim 11
Independent Claim
98 words
A method of reducing noise, including the following steps: providing for the operation of an auxiliary mechanism on a vehicle from the engine of the vehicle where the auxiliary mechanism performs a function different from the propulsion of the vehicle; maintaining the vehicle engine at a speed near its idling speed during the operation of the auxiliary mechanism; using the power from the engine at a speed near its idling speed to provide a hydraulic output boosted relative to the output available from the engine at idling speeds, and using the hydraulic output to drive the auxiliary mechanism.
Claim 12
Independent Claim
98 words
A method of reducing noise, including the following steps: providing for the operation of an auxiliary mechanism on a vehicle from the engine of the vehicle where the auxiliary mechanism performs a function different from the propulsion of the vehicle; maintaining the vehicle engine at a speed near its idling speed during the operation of the auxiliary mechanism; using the power from the engine at a speed near its idling speed to provide a hydraulic output boosted relative to the output available from the engine at idling speeds, and using the hydraulic output to drive the auxiliary mechanism.
Claim 13
Dependent Claim
34 words
A method as set forth in claim 9, including the step of: inhibiting the use of hydraulic output to drive the auxiliary mechanism when the speed of the engine increases above a particular value.
Claim 14
Dependent Claim
30 words
A method as set forth in claim 10, including the step of: controlling the amount of the hydraulic output at engine speeds between the idling speed and the particular value.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |