GB1594660A - Damped speed of rotation sensors - Google Patents
Damped speed of rotation sensors Download PDFInfo
- 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
Links
- 238000013016 damping Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 239000010937 tungsten Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D13/00—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
- G05D13/02—Details
- G05D13/06—Details providing for damping of erratic vibrations in governors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/14—Suppression 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
Landscapes
- 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)
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.
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)
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)
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 |
-
1977
- 1977-05-06 DE DE2720349A patent/DE2720349C3/en not_active Expired
-
1978
- 1978-04-17 IT IT48924/78A patent/IT1102165B/en active
- 1978-05-02 GB GB17239/78A patent/GB1594660A/en not_active Expired
- 1978-05-05 FR FR7813351A patent/FR2389936B1/fr not_active Expired
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 |