US3807251A - Drive assembly for use under wide operating temperature ranges - Google Patents

Drive assembly for use under wide operating temperature ranges Download PDF

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Publication number
US3807251A
US3807251A US00308431A US30843172A US3807251A US 3807251 A US3807251 A US 3807251A US 00308431 A US00308431 A US 00308431A US 30843172 A US30843172 A US 30843172A US 3807251 A US3807251 A US 3807251A
Authority
US
United States
Prior art keywords
bearing plate
drive
drive shaft
driven wheel
drive assembly
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 - Lifetime
Application number
US00308431A
Other languages
English (en)
Inventor
K Schubert
R Deiss
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.)
SWF Auto Electric GmbH
Original Assignee
SWF Spezialfabrik fuer Autozubehoer Gustav Rau 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 SWF Spezialfabrik fuer Autozubehoer Gustav Rau GmbH filed Critical SWF Spezialfabrik fuer Autozubehoer Gustav Rau GmbH
Application granted granted Critical
Publication of US3807251A publication Critical patent/US3807251A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/06—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with parallel axes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears
    • Y10T74/19679—Spur
    • Y10T74/19684—Motor and gearing

Definitions

  • the drive shaft drives a driven wheel, preferably by means of a pinion in meshed engagement with the driven wheel, and the driven wheel is also mounted in the bearing plate laterally offset from the drive shaft. Compensation for any variations in operating temperature is provided by forming the drive shaft, the driven wheel and the bearing plate of synthetic plastic material having the same temperature coefficient of expansion.
  • the present invention is directed to a drive assembly such as the drive for a flashing warning light, and, more particularly, it is directed to an arrangement of the drive assembly which operates effectively over a wide range of operating temperatures.
  • the drive assembly includes a drive motor,,a drive shaft connected to the motor which meshes with a driven gear wheel either directly or by means of a driving gear wheel and the drive shaft of the motor and the shaft of the driven gear are mounted in a common bearing plate.
  • the bearing plate and the driven gear wheel or the bearing plate along with both the drive shaft and the driven gear wheel are formed of a synthetic plastic material having substantially the same temperature coefficient of expansion.
  • the degree of meshing between the drive and driven members does not change, because, as the temperature fluctuates, the distance be tween the-drive shaft of the motor and the bearing shaft of the driven gear wheel changes to the same extent as the dimensions of the various parts involved.
  • Simplification of the drive assembly can be achieved in a self-aligning bearing positioned in a seat formed integrally with the bearing plate.
  • a dc. commutator motor If a dc. commutator motor is used, its construction can be simplified by forming the brush holders for the carbon brushes integrally with the bearing plate. In such an arrangement the number of individual parts can be reduced.
  • the drawing is a cross-sectional view of a drive assembly embodying the present invention.
  • a drive motor 10 has a drive shaft 30 extending outwardly from the motor and mounted in a bearing plate 12 by means of. a selfaligning bearing 13 positioned in a seat 31 formed integrally in the bearing plate.
  • the bearing is secured axially relative to the motor 10 on the commutator end of the drive shaft 30 by means of a washer 19 and a spring clip. 18 engaged within a groove in the drive shaft.
  • the bearing is secured by a washer 20 and a'collar 21 of the drive shaft 30.
  • an extension 22 of the bearing plate adjacent the commutator 23 of the drive motor serves as a holder for the carbon brushes.
  • the drive assembly includes a gear wheel 16 in meshed engagement with the toothed pinion 17 of the driving shaft, and the gear wheel can be directly connected, for example, to a rotating flashing warning.
  • the axis of rotation of the driven gear wheel 16 is spaced laterally from the axis of the drive shaft and thegear wheel is also mounted in the bearing plate 12 by means of a hollow stub shaft 24.
  • the hollow stub shaft 24 may be formed separately from the bearing plate 12 and it may also be formed integrally with the bearing plate.
  • the two bushings 25, 26 permit rotation of the driven gear wheel 16 on the stub shaft 24.
  • a set screw 28 Threaded into one end of the hollow stub shaft 24 is a set screw 28 with a connecting cable 27 so that an electrical connection can be provided for a rotating flashing warning light positioned within the opening 29 in the shaft 24.
  • the combination of the bearing plate 12 and the driven gear wheel 16 and, if desired, the drive shaft or a separate driving gear wheel connected to the drive shaft, are formed of a synthetic plastic material having the same or substantially the same temperature coefficient of expansion, so that the meshed engagement between the driven gear wheel 16 and the toothed pinion 17 remain substantially independent of ambient temperature changes. This occurs'because the distance between the drive shaft 30 and the stub shaft 24 changes to the same extent and in the same direction as the dimensions of the interengaging gear wheels.
  • a drive assembly comprising a bearing plate, a drive motor, a drive shaft connected to and extending from said drive motor, said drive shaft mounted in said bearing plate, a driven wheel arranged to be driven by said drive shaft, said driven wheel mounted in said drive shaft so that its axis is offset from the axis of said drive shaft, at least said bearing plate and said driven wheel are formed of synthetic plastic material having substantially the same temperature coefficient of expansion.
  • a drive assembly as set forth in claim 1, wherein said driven wheel is a gear wheel, a toothed pinion formed on said drive shaft and disposed in meshed engagement with said driven wheel, and said drive shaft and pinion are formed of a synthetic plastic material having the same temperature coefficient of expansion as said bearing plate and driven wheel.
  • a drive assembly as set forth in claim 1, wherein a hollow stub shaft is mounted in said bearing plate, and said driven wheel is rotationally mounted on said 4 stub shaft.
  • a drive assembly as set forth in claim 3, wherein said stub shaft is formed integrally with said bearing plate.
  • a drive assembly as set forthin claim 2, wherein said bearing plate has a seat formed integrally therein, a self-aligning bearing mounted in the seat in said bearing plate, and said drive shaft mounted in and extend ing through said self-aligning bearing.
  • a drive assembly as set forth in claim 5, wherein said pinion on said drive shaft is on the end of said drive shaft on the opposite side of said bearing plate from said drive motor.
  • a drive assembly as set forth in claim 3,'wherein a set screw is threaded into said hollow stub shaft, and

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear Transmission (AREA)
  • General Details Of Gearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US00308431A 1971-11-26 1972-11-21 Drive assembly for use under wide operating temperature ranges Expired - Lifetime US3807251A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19717144560U DE7144560U (de) 1971-11-26 1971-11-26 Antriebsmotor insbesondere zum antrieb einer warnblinkleuchte

Publications (1)

Publication Number Publication Date
US3807251A true US3807251A (en) 1974-04-30

Family

ID=6625340

Family Applications (1)

Application Number Title Priority Date Filing Date
US00308431A Expired - Lifetime US3807251A (en) 1971-11-26 1972-11-21 Drive assembly for use under wide operating temperature ranges

Country Status (8)

Country Link
US (1) US3807251A (it)
AT (1) AT321747B (it)
BE (1) BE791438A (it)
DE (1) DE7144560U (it)
FR (1) FR2162963A5 (it)
GB (1) GB1391098A (it)
IT (1) IT970582B (it)
SE (1) SE377987B (it)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3651707A (en) * 1970-07-22 1972-03-28 Thor Power Tool Co Portable power tool construction

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3651707A (en) * 1970-07-22 1972-03-28 Thor Power Tool Co Portable power tool construction

Also Published As

Publication number Publication date
DE7144560U (de) 1972-02-10
FR2162963A5 (it) 1973-07-20
SE377987B (it) 1975-08-04
IT970582B (it) 1974-04-20
GB1391098A (en) 1975-04-16
AT321747B (de) 1975-04-10
BE791438A (fr) 1973-03-16

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