GB1594660A - Damped speed of rotation sensors - Google Patents

Damped speed of rotation sensors Download PDF

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Publication number
GB1594660A
GB1594660A GB17239/78A GB1723978A GB1594660A GB 1594660 A GB1594660 A GB 1594660A GB 17239/78 A GB17239/78 A GB 17239/78A GB 1723978 A GB1723978 A GB 1723978A GB 1594660 A GB1594660 A GB 1594660A
Authority
GB
United Kingdom
Prior art keywords
speed
centrifugal weights
damping
rotation sensor
centrifugal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB17239/78A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen GmbH
MTU Motoren und Turbinen Union Friedrichshafen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MTU Friedrichshafen GmbH, MTU Motoren und Turbinen Union Friedrichshafen GmbH filed Critical MTU Friedrichshafen GmbH
Publication of GB1594660A publication Critical patent/GB1594660A/en
Expired legal-status Critical Current

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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D13/00Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
    • G05D13/02Details
    • G05D13/06Details providing for damping of erratic vibrations in governors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/14Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Braking Arrangements (AREA)

Description

(54) DAMPED SPEED OF ROTATION SENSORS (71) We, MoTOREN-uND-TURslNEN- UNK)N FRIEDRICHSHAFEN GMBH, a West German Body Corporate, of D-7990 Friedrichshafen 1, Olgastrasse 75, Postfach 289, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to speed of rotation sensors having centrifugal weights acting against the force of a spring system.
Injection-timing means for internalcombustion engines are known (German Gbm.
66 03 051) in which the centrifugal weights of the speed sensor are pressed by spring force against a slide surface for the purpose of vibration damping. The damping action which can be achieved thereby is influenced, however, by different friction values due to varying lubrication conditions. Moreover, upon achieving sufficient damping, the degree of insensitivity of control is inadmissibly increased so that there is no longer ensured the desired coordination of injection timing with engine speed, necessary for optimum combustion.
Moreover, another injection-timing means is known (German AS 12 41 663), in which the centrifugal weights of the speed sensor are accommodated in a housing which is fluidtight and which contains a damping fluid, said fluid being displaced through orifices of narrow cross-section from the radially outer side of the centrifugal weights towards the inner side and vice versa, during the outward and inward travel of the centrifugal weights respectively.
Hydraulic damping of the centrifugal weights is thereby achieved dependent upon temperature and at considerable expense for the fluidtight housing, which damping not only counteracts, however, the detrimental natural oscillations of the mass/spring system, but also opposes a velocity dependent damping force to the control motion of the centrifugal weights.
The degree of insensitivity of control is likewise increased thereby when the engine speed is being raised or lowered.
According to the invention there is provided a speed of rotation sensor comprising inherently damped centrifugal weights acting against the force of a spring system, characterised in that the centrifugal weights comprise hollow bodies each containing a multiplicity of fine-grained particles.
The particles may consist of tungsten.
By way of example, an embodiment of a speed of rotation sensor according to the invention will now be described with reference to the accompanying drawing, which is a longitudinal sectional view through a centrifugal weight of a speed sensor for transmitting control motion to a regulator linkage over the outer periphery of the centrifugal weight along slideways connected with the regulator linkage or forming the regulator linkage.
The illustrated centrifugal weight comprises a hollow body 15 which is made in two halves joined by friction welding. The hollow body 15 which co-operates over its outer periphery 16 with slideways (not shown) of a regulator linkage is filled through a bore 18, which can be sealed with a sphere 17, with a multiplicity of fine-grained tungsten particles 19. During accelerations and decelerations, the individual tungsten particles carry out relative movements to one another and in relation to the hollow body, whereupon the induced oscillation energy is converted into heat by the friction which occurs between the particles and natural oscillations are effectively damped.
Some advantages of this embodiment of the invention are that the natural vibrations or oscillations of a mass/spring speed of rotation sensor which are induced by shocks or varying torques in a drive unit or from the controlling side of the speed sensor and which cause premature wear in the regulator or governor linkage, deflection of articulations and damage to slideways and gear teeth in the drive units are damped without affecting the control motion of the weights as a result of a change in the speed of rotation.
Accordingly, damping only takes place when accelerations or decelerations, such as occur in the event of natural oscillations, act on the centrifugal weights. The normal control movements of the centrifugal weights at approximately uniform velocity or with negligible accelerations are not damped.
Accordingly, this type of oscillation damping does not, or only to a negligible extent, bring about any change in the degree of insensitivity inherent in the control system. The required centrifugal weights can be produced at low construction cost and may also be installed subsequently in existing governor designs, since no additional installation space is necessary for the damping. The damping is not affected to any significant extent by variations in temperature. The heat produced by the conversion of the induced oscillation energy is dissipated without difficulty by the air turbulence arising during the rotary motion of the centrifugal weights.
WHAT WE CLAIM IS: - 1. A speed of rotation sensor comprising inherently damped centrifugal weights acting against the force of a spring system, characterised in that the centrifugal weights comprise hollow bodies each containing a multiplicity of fine-grained particles.
2. A speed of rotation sensor as claimed in claim 1, characterised in that the particles contained in the hollow bodies consist of tungsten.
3. A speed of rotation sensor comprising a centrifugal weight substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. no additional installation space is necessary for the damping. The damping is not affected to any significant extent by variations in temperature. The heat produced by the conversion of the induced oscillation energy is dissipated without difficulty by the air turbulence arising during the rotary motion of the centrifugal weights. WHAT WE CLAIM IS: -
1. A speed of rotation sensor comprising inherently damped centrifugal weights acting against the force of a spring system, characterised in that the centrifugal weights comprise hollow bodies each containing a multiplicity of fine-grained particles.
2. A speed of rotation sensor as claimed in claim 1, characterised in that the particles contained in the hollow bodies consist of tungsten.
3. A speed of rotation sensor comprising a centrifugal weight substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
GB17239/78A 1977-05-06 1978-05-02 Damped speed of rotation sensors Expired GB1594660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2720349A DE2720349C3 (en) 1977-05-06 1977-05-06 Damping of speed sensors

Publications (1)

Publication Number Publication Date
GB1594660A true GB1594660A (en) 1981-08-05

Family

ID=6008220

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17239/78A Expired GB1594660A (en) 1977-05-06 1978-05-02 Damped speed of rotation sensors

Country Status (4)

Country Link
DE (1) DE2720349C3 (en)
FR (1) FR2389936B1 (en)
GB (1) GB1594660A (en)
IT (1) IT1102165B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3716174A1 (en) * 1987-05-14 1988-11-24 Kloeckner Humboldt Deutz Ag Mechanical Speed Governor with Mass Compensation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE900532C (en) * 1951-01-31 1953-12-28 Friedrich Wilhelm Deckel Dipl Centrifugal governors, especially for injection pumps of internal combustion engines
DE964744C (en) * 1954-02-18 1957-05-29 Fichtel & Sachs Ag Centrifugal governor
US3470748A (en) * 1967-02-21 1969-10-07 United Aircraft Corp Vibration damper
GB1364798A (en) * 1973-03-14 1974-08-29 Hawthorn Leslie Engineers Ltd Device for sensing rotary speed

Also Published As

Publication number Publication date
FR2389936A1 (en) 1978-12-01
FR2389936B1 (en) 1982-12-31
DE2720349A1 (en) 1978-11-16
DE2720349B2 (en) 1980-03-06
DE2720349C3 (en) 1980-10-30
IT1102165B (en) 1985-10-07
IT7848924A0 (en) 1978-04-17

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940502