CA1050094A - Ventilated mower motor - Google Patents
Ventilated mower motorInfo
- Publication number
- CA1050094A CA1050094A CA250,985A CA250985A CA1050094A CA 1050094 A CA1050094 A CA 1050094A CA 250985 A CA250985 A CA 250985A CA 1050094 A CA1050094 A CA 1050094A
- Authority
- CA
- Canada
- Prior art keywords
- apertures
- motor
- housing
- deck
- mower
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/76—Driving mechanisms for the cutters
- A01D34/78—Driving mechanisms for the cutters electric
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/81—Casings; Housings
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D69/00—Driving mechanisms or parts thereof for harvesters or mowers
- A01D69/02—Driving mechanisms or parts thereof for harvesters or mowers electric
Abstract
VENTILATED MOWER MOTOR
ABSTRACT OF THE DISCLOSURE
A ventilated mower motor for a mower having a deck, all electric motor within a housing mounted on the deck, a thermal switch sensing the motor temperature within the housing and a pressure differential creating blade rotatably supported by the motor below the deck. The improved ventilation system arises from a plurality of inlet apertures located below the position of the thermal switch and a plurality of outlet apertures located above and in close proximity to the blade. These aperture locations create a cooling air flow through the motor housing by utilizing the pressure differential created by the blade.
ABSTRACT OF THE DISCLOSURE
A ventilated mower motor for a mower having a deck, all electric motor within a housing mounted on the deck, a thermal switch sensing the motor temperature within the housing and a pressure differential creating blade rotatably supported by the motor below the deck. The improved ventilation system arises from a plurality of inlet apertures located below the position of the thermal switch and a plurality of outlet apertures located above and in close proximity to the blade. These aperture locations create a cooling air flow through the motor housing by utilizing the pressure differential created by the blade.
Description
105009d~ .
VENTILATED MOWER MOTOR
BACKGROUND OF THE INVENTION
~ .
This invention relates generally to the cooling of electric motors and more particularly, conce~ns the cooling of electric motors which are providing the motive force to a mower blade.
The electric motor has been used for many years as the drive mechanism in a multitude of applications. However, in recent years the use of electric motors to drive mowing implements has drastically increased. This large scaled application of electric motors has produced various problems in maintaining performance and safety with one such prGblem being the control and measurement of the temperature of the motor.
The currently accepted arrangement for measuring and maintaining a safe motor operating temperature is to use a thermal switch connected to the motor in conjunction with
VENTILATED MOWER MOTOR
BACKGROUND OF THE INVENTION
~ .
This invention relates generally to the cooling of electric motors and more particularly, conce~ns the cooling of electric motors which are providing the motive force to a mower blade.
The electric motor has been used for many years as the drive mechanism in a multitude of applications. However, in recent years the use of electric motors to drive mowing implements has drastically increased. This large scaled application of electric motors has produced various problems in maintaining performance and safety with one such prGblem being the control and measurement of the temperature of the motor.
The currently accepted arrangement for measuring and maintaining a safe motor operating temperature is to use a thermal switch connected to the motor in conjunction with
2 ~
~05~094 a series of openings through which air is forced to flow.
The thermal switch is of the type which cuts off a supply of electricity to the motor upon the motor reaching a designated maximum temperature. The nature of the switch and its necessary connections require that it be located on an external surface of the motor elements which are located within the motor' 9 housing. This location requirement can produce an inacc~rate temperature sensing since the external surfaces of the motor within the housing are all exposed to the air flow through the housing. ~s a result of the artifically low temperature sense by the switch, the motor will not be shut down at the desired maximum temperature and it will overheat thereby damaging its various internal elements. In addition to these inherent inaccuracie~ in the accepted arrangement, the environment in which the mower motor must survive requires that the integrity of the motor be protected by use of a filtering device which protects the motor's internal mechanism, e.g. the brushes and commutator, from the dirt present in the air.
Accordingly it is an object of the present invention to provide a mower motor arrangement which is air cooled without the use of a filtering device.
More specifically, it is an object of the present invention to provide a mower motor arrangement which is air cooled without a filter device while giving an accurate temperature reading for the thermal switch of the motor.
Finally, it is an object of the present invention to provide the above described cooling arrangement which also minimizes the complexity of the system by utilizing the mower blade to pump the cooling air.
~050094 SUMMARY OF THE INVI:NTION
The invention contemplates an electric motor for a mower having a deck. The electric motor includes a field, brushes and a commutator within a housing mounted on the deck-, and a thermal switch in close proximity to the brushes within the housing for sensing the motor temperature~ The improvement comprises a pressure differential creating blade rotatably supported below the ~ deck, with the housing having a plurality of inlet apertures located below the position of the brushes and commutator and having a plurality of staggered outlet means located below the field and above and in close proximity to the blade for creating air flow through the inlet apertures, the housing and through the outlet means, thus utilizing the pressure differential to create the air flow.
.
Other advantages and objects of the invention will become apparent upon reading the following detailed description and upon reference to the drawings in which the figure is a partial sectional view of a mower incorporating the ventilation arrangement of the present invention. While the invention will be described in connection with a preferred embodiment, it will be understood that it is not intended to limit the invention to that embodiment. On the contrary, it is intended to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
, DETAILED DESCRIPTION OF THE INVENTION
As shown in the Figure the preferred embodiment of the present invention has ~the electric motor 10 rigidly mounted on the mower deck 12 with the cutting blade 14 secured to the output shaft 16 of the mower by connecting 10S~094 means 18. The blade 14 of the preferred embodiment has raised edge 20 which inputs a radial motion to the air beneath the deck 12 to force the cut material out the discharge chute (not shown) thereby avoiding clogging of the blade and deck. The air pump affect of the blade creates a lower pressure in the area of the output shaft that exists above the deck around the motor.
The electric motor 10 of the preferred embodiment is a conventional motor having a rotatable armature 22 centrally located within the field 24. The armature 22 includes an armature winding assembly 26 and a communicator 28 which are attached to the output shaft for rutation therewith. The communicator 28 contacts brushes 30 which are carried by the brush holder 32 and biased into contact by springs 34. The brush holder 32 is rigidly attached to the housing 36 and also acts as the mounting member for the thermal switch 38 of the;motor.
In the particular device illustrated the thermal switch 38 is mounted rigidly on the upper surface of the brush holder 32 with its connecting wires 40 passing through an aperture 42 and the cap 44 of the housing 36. In the preferred embodiment, a thermal switch 38 is connected in series with the electrical circuitry that supplies the motor lO with current from the power source (not shown). The thermal switch 38 is of the conventional type which will break the connection between the power source and the motor upon the motor reaching a specified maximum temperature.
In carrying out the invention, there is provided a plurality of inlet apertures 46 and outlet apertures 48 in the cup 50 of the motor housing 36. As depicted in the `` ~050094 - figure, the apertures 46 are positioned below the location of the thermal switch 38 thereby minimizing the cooling effect which the cooling air has on the thermal switch, and the exposure of the commutator and brushes to contaminants in the cooling air. In the particular device illustrated the inlet apertures 46 consists of two radially opposed substantially vertical apertures in the side wall 52 of the cup 50. In order to maximize the air flow through the motor, four radially symmetxical outlet apertures 48 are located in close proximity to the blade 14 in the horizontal bottom pla.e 54 of the cup 50. In addition to the perpendi-cularity of the planes containing the inlet and outlet apertures, the outlet apertures are staggered from the inlet apertures by being located on radial lines which are substantially 45 degrees offset from the radial alignment locating the inlet aper~-ures thereby causing a directional change in the air flow which makes the contaminants of the cooling air fall to the bottom piate 54.
Thus, in the present embodiment, there is provided - 20 a cooling arrangement for an elect.ric mower motor which maximizes the accuracy of the thermal switches temperature sensing by minimizing its exposure to cooling air and eliminates the need for a filter for the cooling air by locating the inlet apertures below the critical internal elements and by inducing directional changes in the air flow to purify the air while minimizing the complexity of the cooling arrangement-through utilization of the mower blade as the air pump.
Thus it is apparent that there has been provided, in accordance with the invention, a ventilated mower motor A
that fully satisfies the objects, aims, and advantages, set forth above. While the invention has been described in conjunction with the specific embodiment thereof, it is evident that many alternatives, modifications, and variations will be apparent to those sk lled in the art in light of the foregoing description. Accordingly, it ~ is intended to embrace all such alternatives, modifications, and variations chat fall within the spirit and broad scope i of the appended claims.
10 i
~05~094 a series of openings through which air is forced to flow.
The thermal switch is of the type which cuts off a supply of electricity to the motor upon the motor reaching a designated maximum temperature. The nature of the switch and its necessary connections require that it be located on an external surface of the motor elements which are located within the motor' 9 housing. This location requirement can produce an inacc~rate temperature sensing since the external surfaces of the motor within the housing are all exposed to the air flow through the housing. ~s a result of the artifically low temperature sense by the switch, the motor will not be shut down at the desired maximum temperature and it will overheat thereby damaging its various internal elements. In addition to these inherent inaccuracie~ in the accepted arrangement, the environment in which the mower motor must survive requires that the integrity of the motor be protected by use of a filtering device which protects the motor's internal mechanism, e.g. the brushes and commutator, from the dirt present in the air.
Accordingly it is an object of the present invention to provide a mower motor arrangement which is air cooled without the use of a filtering device.
More specifically, it is an object of the present invention to provide a mower motor arrangement which is air cooled without a filter device while giving an accurate temperature reading for the thermal switch of the motor.
Finally, it is an object of the present invention to provide the above described cooling arrangement which also minimizes the complexity of the system by utilizing the mower blade to pump the cooling air.
~050094 SUMMARY OF THE INVI:NTION
The invention contemplates an electric motor for a mower having a deck. The electric motor includes a field, brushes and a commutator within a housing mounted on the deck-, and a thermal switch in close proximity to the brushes within the housing for sensing the motor temperature~ The improvement comprises a pressure differential creating blade rotatably supported below the ~ deck, with the housing having a plurality of inlet apertures located below the position of the brushes and commutator and having a plurality of staggered outlet means located below the field and above and in close proximity to the blade for creating air flow through the inlet apertures, the housing and through the outlet means, thus utilizing the pressure differential to create the air flow.
.
Other advantages and objects of the invention will become apparent upon reading the following detailed description and upon reference to the drawings in which the figure is a partial sectional view of a mower incorporating the ventilation arrangement of the present invention. While the invention will be described in connection with a preferred embodiment, it will be understood that it is not intended to limit the invention to that embodiment. On the contrary, it is intended to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
, DETAILED DESCRIPTION OF THE INVENTION
As shown in the Figure the preferred embodiment of the present invention has ~the electric motor 10 rigidly mounted on the mower deck 12 with the cutting blade 14 secured to the output shaft 16 of the mower by connecting 10S~094 means 18. The blade 14 of the preferred embodiment has raised edge 20 which inputs a radial motion to the air beneath the deck 12 to force the cut material out the discharge chute (not shown) thereby avoiding clogging of the blade and deck. The air pump affect of the blade creates a lower pressure in the area of the output shaft that exists above the deck around the motor.
The electric motor 10 of the preferred embodiment is a conventional motor having a rotatable armature 22 centrally located within the field 24. The armature 22 includes an armature winding assembly 26 and a communicator 28 which are attached to the output shaft for rutation therewith. The communicator 28 contacts brushes 30 which are carried by the brush holder 32 and biased into contact by springs 34. The brush holder 32 is rigidly attached to the housing 36 and also acts as the mounting member for the thermal switch 38 of the;motor.
In the particular device illustrated the thermal switch 38 is mounted rigidly on the upper surface of the brush holder 32 with its connecting wires 40 passing through an aperture 42 and the cap 44 of the housing 36. In the preferred embodiment, a thermal switch 38 is connected in series with the electrical circuitry that supplies the motor lO with current from the power source (not shown). The thermal switch 38 is of the conventional type which will break the connection between the power source and the motor upon the motor reaching a specified maximum temperature.
In carrying out the invention, there is provided a plurality of inlet apertures 46 and outlet apertures 48 in the cup 50 of the motor housing 36. As depicted in the `` ~050094 - figure, the apertures 46 are positioned below the location of the thermal switch 38 thereby minimizing the cooling effect which the cooling air has on the thermal switch, and the exposure of the commutator and brushes to contaminants in the cooling air. In the particular device illustrated the inlet apertures 46 consists of two radially opposed substantially vertical apertures in the side wall 52 of the cup 50. In order to maximize the air flow through the motor, four radially symmetxical outlet apertures 48 are located in close proximity to the blade 14 in the horizontal bottom pla.e 54 of the cup 50. In addition to the perpendi-cularity of the planes containing the inlet and outlet apertures, the outlet apertures are staggered from the inlet apertures by being located on radial lines which are substantially 45 degrees offset from the radial alignment locating the inlet aper~-ures thereby causing a directional change in the air flow which makes the contaminants of the cooling air fall to the bottom piate 54.
Thus, in the present embodiment, there is provided - 20 a cooling arrangement for an elect.ric mower motor which maximizes the accuracy of the thermal switches temperature sensing by minimizing its exposure to cooling air and eliminates the need for a filter for the cooling air by locating the inlet apertures below the critical internal elements and by inducing directional changes in the air flow to purify the air while minimizing the complexity of the cooling arrangement-through utilization of the mower blade as the air pump.
Thus it is apparent that there has been provided, in accordance with the invention, a ventilated mower motor A
that fully satisfies the objects, aims, and advantages, set forth above. While the invention has been described in conjunction with the specific embodiment thereof, it is evident that many alternatives, modifications, and variations will be apparent to those sk lled in the art in light of the foregoing description. Accordingly, it ~ is intended to embrace all such alternatives, modifications, and variations chat fall within the spirit and broad scope i of the appended claims.
10 i
3~
Claims (7)
1. In a mower having a deck, an electric motor with afield, brushes and a commutator within a housing mounted on said deck, a thermal switch in close proximity to said brushes within said housing for sensing the motor temperature, the improvement comprising; a pressure differential creating blade rotatably supported below said deck, said housing having a plurality of inlet apertures located below the position of said brushes and commutator, and a plurality of staggered outlet means located below said field and above and in close proximity to said blade for creating air flow through said inlet apertures, said housing and through said outlet means utilizing said pressure differential to create said air flow.
2. The structure as defined in Claim 1 wherein said plurality of inlet apertures consists of two radially opposed apertures and said plurality of outlet means consists of four radially symmetrical apertures in said housing.
3. The structure as defined in Claim 2 wherein said inlet apertures are substantially vertical and said outlet apertures are substantially horizontal.
4. The structure as defined in Claim 1 wherein said plurality of inlet apertures consists of two radially opposed apertures and said plurality of outlet means consists of four radially symmetrical apertures in said deck.
5. The structure as defined in Claim 4 wherein said inlet apertures are substantially vertical and said outlet apertures are substantially horizontal.
6. The structure as defined in Claim 1 wherein said plurality of inlet apertures consists of two radially opposed apertures and said plurality of outlet means consists of four radially symmetrical apertures in said deck and said housing.
7. The structure as defined in Claim 6 wherein said inlet apertures are substantially horizontal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US61094275A | 1975-09-08 | 1975-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1050094A true CA1050094A (en) | 1979-03-06 |
Family
ID=24447018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA250,985A Expired CA1050094A (en) | 1975-09-08 | 1976-04-26 | Ventilated mower motor |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1050094A (en) |
| DE (1) | DE2638258A1 (en) |
| FR (1) | FR2322529A1 (en) |
| GB (1) | GB1495920A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103283406B (en) * | 2013-06-26 | 2015-11-25 | 苏州金威特工具有限公司 | A kind of air-cooled mower |
| JP6322061B2 (en) * | 2014-06-16 | 2018-05-09 | 株式会社クボタ | Moore |
| FR3039355B1 (en) * | 2015-07-27 | 2017-07-14 | Pellenc Sa | ELECTRIC MOWER WITH MULTIPLE BLADES |
-
1976
- 1976-04-26 CA CA250,985A patent/CA1050094A/en not_active Expired
- 1976-05-13 GB GB1969176A patent/GB1495920A/en not_active Expired
- 1976-08-25 DE DE19762638258 patent/DE2638258A1/en active Pending
- 1976-09-08 FR FR7627051A patent/FR2322529A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE2638258A1 (en) | 1977-03-10 |
| FR2322529A1 (en) | 1977-04-01 |
| GB1495920A (en) | 1977-12-21 |
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