GB2347480A - Motor driving system - Google Patents
Motor driving system Download PDFInfo
- Publication number
- GB2347480A GB2347480A GB9904697A GB9904697A GB2347480A GB 2347480 A GB2347480 A GB 2347480A GB 9904697 A GB9904697 A GB 9904697A GB 9904697 A GB9904697 A GB 9904697A GB 2347480 A GB2347480 A GB 2347480A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- drive shaft
- transmission
- central axis
- shaft
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
- F16D1/101—Quick-acting couplings in which the parts are connected by simply bringing them together axially without axial retaining means rotating with the coupling
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
In a motor driving system a motor 10 with a drive shaft 12 along a central axis is connected to a transmission system 20 having a holding plate 21 and a transmission shaft 22 along the central axis. The transmission shaft 22 has an end connected to the drive shaft 12 and is supported by a bearing 23 to keep the transmission and drive shafts aligned on the central axis. A projection 13 from a connecting flange 11 of the motor 10 engages in a circular depression 24 in the holding plate 21 of the transmission system 20. Vibrations and noise during operation of the motor are effectively reduced.
Description
MOTOR DRIVING SYSTEM
BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a motor driving system, particularly to a motor driving system of simple structure, which reduces vibrations of the drive shaft of the motor.
2. Description of Related Art
Usually a motor delivers power at a high rate of revolutions and low torque. In order to obtain a usable, lower rate of revolutions, a transmission system is employed, which at the same time increases torque.
As shown in Fig. 3, conventionally a motor 1 and a transmission system (or gearbox) 2 separate therefrom are used. The motor 1 has a drive shaft 3, and the transmission system 2 has an transmission shaft 4, which is connected to the drive shaft 3. Since the motor 1 and the transmission system 2 are separate units, the drive shaft 3 and the transmission shaft 4 are basically not exactly aligned, and there will be a small eccentricity with respect to each other. With a considerable length of the drive shaft 3 and the transmission shaft 4 vibrations occur easily.
Therefore a lengthened drive shaft for the motor has been devised, which is directly connected to the gears of the transmission system. This arrangement, however, exposes the gears of the transmission system directly to vibrations of the drive shaft, such that they are easily damaged.
In a conventional setup, vibrations between the drive shaft 3 and the transmission shaft 4 not only generate noise, but also lead to fatigue of the drive shaft 3. In order to eliminate the effect of misalignment between the drive shaft 3 and the transmission shaft 4 and of subsequent vibrations, a flexible connector 5, inserted between the drive shaft 3 and the transmission shaft 4, has been used as an absorbing element.
Many types of flexible connectors have appeared on the market, but all of them have a complicated structure, leading to increased costs, nevertheless still need higher precision. Furthermore, the additional flexible connector 5 between the drive shaft 3 and the transmission shaft 4 requires extra space, so does not allow for a compact design of motor 1 and transmission system 2.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a motor driving system, in which misalignment between the drive shaft of the motor and the transmission shaft of the transmission system is minimized without the need of a connector.
Another object of the present invention is to provide a motor driving system of simple structure.
A further object of the present invention is to provide a motor driving system of little space requirement, allowing for a small distance between the motor and the transmission system.
The present invention can be more fully understood by reference to the following description and accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional view of the motor and the transmission system of the present invention, separated. from each other.
Fi'g. 2 is a sectional view of the motor and the transmission system of the present invention, connected to each other.
Fig. 2A is a cross-sectional view of the drive shaft and the transmission shaft of the present invention.
Fig. 2B is a cross-sectional view of the drive shaft and the transmission shaft of the present invention in another embodiment.
Fig. 2C is a cross-sectional view of the drive shaft and the transmission shaft of the present invention in a further embodiment.
Fig. 3 is a schematic illustration of a conventional motor and transmission system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As shown in Fig. 1, the motor driving system of the present invention mainly comprises a motor 10 and a transmission system 20. The motor 10 has a front side, where a connecting flange 11 is attached, with a central axis passing through the front side. A drive shaft 12 runs along the central axis, having a front section 121 projecting from the front side of the motor 10. The transmission system 20 has a rear side, facing the front side of the motor 10, with a holding plate 21 and a transmission shaft 22 along the central axis, which is connected to the drive shaft 12.
Referring to Fig. 2, a hole 211, concentric with the central axis, is bored through the holding plate 21 for accommodating the front end 121 of the output shaft 12, allowing it to connect to the transmission shaft 22. The holding plate 21 is fastened to the connecting flange 11. As shown in Figs. 1 and 2, from the front side of the connecting flange 11 a ring-shaped positioning projection 13 extends outward. The holding plate 21 has on its rear side a circular depression 24 with a periphery, into which the positioning projection 13 fits for positioning the motor 10 and the transmission system 20 relative to each other without further need for correction.
Referring to Fig. 2A, the front section 121 of the drive shaft 12 is not circular, but flattened with at least one flat surface 122. The transmission shaft 22 has a rear end with an opening 221 with the same cross section as the front section 121 of the drive shaft 12.
Therefore the front section 121 fits into the opening 221, and a rotary movement of the drive shaft 12 is transmitted to the transmission shaft 22.
Referring to Fig. 2C, in another embodiment of the present invention, a drive shaft 12A with an opening 121A on the front end thereof and a transmission shaft 22A with a flattened rear section 221A are employed.
The rear section 221A of the transmission shaft 22A fits into the opening 121A of the drive shaft 12A and is thus taken along with a rotary movement of the drive shaft 12A.
An important characteristic of the present invention is that the transmission shaft 22 of the transmission system 20 is short, completely vanishing therein.
The hole 211 is on one side widened to a circular depression 25, into which a bearing 23 for the transmission shaft 22 is laid, ensuring that the transmission shaft 22 remains along the central axis. The bearing 23 effectively prevents lateral and angular deviations of the transmission shaft 22 from the central axis and thus does not allow vibrations and noise to develop.
The surfaces of the connecting flange 11 and the holding plate 21 are connected, leaving no space between the motor 10 and the transmission system 20. Only the front section 121 of the drive shaft 12 projects from the front side of the motor 10. Thus any vibrations of the drive shaft 12 are minimized.
For further reduction of vibrations, the present invention in a further embodiment, as shown in Fig. 2B, has additional absorbing material 26 between the at least one flat surface 122 of the drive shaft and the corresponding surface in the opening 221 for absorbing vibrations between the drive shaft 12 and the transmission shaft 22.
The structure of the present invention allows to reduce the combined length of the drive shaft 12 and the transmission shaft 22. The bearing 23 stably positions the transmission shaft 22 and thus the connection thereof to the drive shaft 12 on the central axis, preventing any lateral or angular deviations therefrom.
Thus vibrations and noise are minimized, and material fatigue will not set in.
At the same time, a connector between the drive shaft 12 and the transmission shaft 22 is not required.
Therefore the structure of the present invention is simple, with low costs, and the motor 10 and the transmission system 20 can be placed next to each other to save space.
While the invention has been described with reference to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention which is defined by the appended claims.
Claims (4)
1. A motor driving system, : a motor with a front side and a drive shaft along a central axis; and
a transmission system, having a holding plate for connecting to said front side of said motor and a transmision shaft along said central axis, which has a rear end connected to said drive shaft to be driven thereby and which is supported by a bearing at said rear end, such that said transmission shaft and said drive shaft are kept aligned on said central axis.
2. The motor driving system as claimed in claim 1, wherein said motor on said front end thereof has a connecting flange, on which said holding plate is mounted, said connecting flange and said holding plate having mutually engaging connecting elements for positioning said motor and said transmission system relative to each other.
3. Motor driving systems as claimed in claim 1 and as herein described.
4. Motor driving systems as herein described and illlustrated with reference to Figures 1,2A, 2B and 2C of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3632598A | 1998-03-06 | 1998-03-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9904697D0 GB9904697D0 (en) | 1999-04-21 |
| GB2347480A true GB2347480A (en) | 2000-09-06 |
Family
ID=21887964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9904697A Withdrawn GB2347480A (en) | 1998-03-06 | 1999-03-02 | Motor driving system |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU1852399A (en) |
| GB (1) | GB2347480A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1294078A1 (en) | 2001-09-05 | 2003-03-19 | Xerox Corporation | Gear alignment |
| EP1430979A1 (en) * | 2002-12-21 | 2004-06-23 | Johnson Electric S.A. | A motor and gear box combination |
| WO2012130212A1 (en) * | 2011-03-25 | 2012-10-04 | Neumayer Tekfor Holding Gmbh | Drive arrangement having an electric motor and a gear mechanism |
| FR2976861A1 (en) * | 2011-06-24 | 2012-12-28 | Peugeot Citroen Automobiles Sa | Gear motor for traction of e.g. electric car, has speed-reduction gear comprising input shaft that is aligned with driving shaft of machine, where driving shaft is centered on input shaft by coupling units of driving and input shafts |
| DE102020006832B3 (en) | 2020-11-06 | 2021-12-30 | Sew-Eurodrive Gmbh & Co Kg | Gear motor with clutch assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB940296A (en) * | 1959-02-27 | 1963-10-30 | Plessey Co Ltd | Improvements in or relating to pump-and-electric-motor assemblies |
| GB1577804A (en) * | 1976-08-06 | 1980-10-29 | Yoshida Kogyo Kk | Coupling |
| GB2186342A (en) * | 1986-02-06 | 1987-08-12 | Johnson Electric Ind Mfg | An electric motor and gearbox unit and component parts thereof |
| EP0235019A1 (en) * | 1986-02-18 | 1987-09-02 | Forest-Line | Combination rotary spindle tool holder and electric motor |
| GB2276987A (en) * | 1993-04-09 | 1994-10-12 | Koito Mfg Co Ltd | Waterproof casing for pump/motor combination |
| EP0694704A1 (en) * | 1994-07-26 | 1996-01-31 | Nacam | Coupling device for two shafts |
-
1999
- 1999-03-02 AU AU18523/99A patent/AU1852399A/en not_active Abandoned
- 1999-03-02 GB GB9904697A patent/GB2347480A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB940296A (en) * | 1959-02-27 | 1963-10-30 | Plessey Co Ltd | Improvements in or relating to pump-and-electric-motor assemblies |
| GB1577804A (en) * | 1976-08-06 | 1980-10-29 | Yoshida Kogyo Kk | Coupling |
| GB2186342A (en) * | 1986-02-06 | 1987-08-12 | Johnson Electric Ind Mfg | An electric motor and gearbox unit and component parts thereof |
| EP0235019A1 (en) * | 1986-02-18 | 1987-09-02 | Forest-Line | Combination rotary spindle tool holder and electric motor |
| GB2276987A (en) * | 1993-04-09 | 1994-10-12 | Koito Mfg Co Ltd | Waterproof casing for pump/motor combination |
| EP0694704A1 (en) * | 1994-07-26 | 1996-01-31 | Nacam | Coupling device for two shafts |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1294078A1 (en) | 2001-09-05 | 2003-03-19 | Xerox Corporation | Gear alignment |
| US6651522B2 (en) | 2001-09-05 | 2003-11-25 | Xerox Corporation | Gear alignment |
| EP1430979A1 (en) * | 2002-12-21 | 2004-06-23 | Johnson Electric S.A. | A motor and gear box combination |
| US7156191B2 (en) | 2002-12-21 | 2007-01-02 | Johnson Electric S.A. | Motor and gearbox combination |
| CN1320732C (en) * | 2002-12-21 | 2007-06-06 | 德昌电机股份有限公司 | Electric machine and gearbox combined body |
| WO2012130212A1 (en) * | 2011-03-25 | 2012-10-04 | Neumayer Tekfor Holding Gmbh | Drive arrangement having an electric motor and a gear mechanism |
| FR2976861A1 (en) * | 2011-06-24 | 2012-12-28 | Peugeot Citroen Automobiles Sa | Gear motor for traction of e.g. electric car, has speed-reduction gear comprising input shaft that is aligned with driving shaft of machine, where driving shaft is centered on input shaft by coupling units of driving and input shafts |
| DE102020006832B3 (en) | 2020-11-06 | 2021-12-30 | Sew-Eurodrive Gmbh & Co Kg | Gear motor with clutch assembly |
| DE102021005233A1 (en) | 2020-11-06 | 2022-05-12 | Sew-Eurodrive Gmbh & Co Kg | Coupling arrangement, in particular of a geared motor, and geared motor with a clutch arrangement |
| WO2022096272A1 (en) | 2020-11-06 | 2022-05-12 | Sew-Eurodrive Gmbh & Co. Kg | Coupling assembly having a tongue-and-groove insertion connection and geared motor having the coupling assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1852399A (en) | 1999-09-23 |
| GB9904697D0 (en) | 1999-04-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |