CN213937711U - Brushless DC motor with reset device for windshield wiper - Google Patents
Brushless DC motor with reset device for windshield wiper Download PDFInfo
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- CN213937711U CN213937711U CN202022797234.7U CN202022797234U CN213937711U CN 213937711 U CN213937711 U CN 213937711U CN 202022797234 U CN202022797234 U CN 202022797234U CN 213937711 U CN213937711 U CN 213937711U
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- hall element
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Abstract
The invention relates to a brushless direct current motor with a reset device for a windshield wiper, belonging to the field of windshield wipers; the reset device comprises a reset shell, reset Hall magnetic steel, a reset Hall element, a speed reducer and a gear disc; the gear disc, the speed reducer and the reset shell are sequentially coaxially sleeved on the output shaft; the speed reducer is positioned in the shell to realize the speed reducing function of the motor; the reset Hall magnetic steel is embedded on the outer peripheral surface of the shaft shoulder of the reset cam; the reset Hall element is fixed on the gear plate and is arranged opposite to the reset Hall magnetic steel; when the reset Hall element senses the reset Hall magnetic steel signal at the reset position, the output level of the reset Hall element can be reversed, and the motor is powered off and stops at the reset position. The invention integrally designs the speed reducer and the motor, and adopts the reset Hall element and the reset Hall magnetic steel, so that the reset is more reliable and the service life is longer.
Description
Technical Field
The invention belongs to the field of windshield wipers, and particularly relates to a brushless direct current motor with a resetting device for a windshield wiper.
Background
The direct current motor for the windshield wiper requires that the motor must be ensured to stop at a specified position when the motor stops, so that a wiper stop position signal needs to be acquired. There are two methods of signal acquisition based on windshield wiper structural analysis, the first method: the position signal of the windshield wiper can be directly taken and fed back to the controller to stop the motor; the second method comprises the following steps: and a signal synchronous with the windshield wiper is taken from the motor and fed back to the controller to stop the motor.
In the two traditional methods, a microswitch is mechanically pressed to disconnect the switch, and the motor stops working by energy consumption braking after the motor stops supplying power. This method has the following problems: 1) the micro switch can be continuously opened and closed during normal work, so that the requirement on the service life of the switch is met; 2) the switch is limited in disconnection time, and when the rotating speed of the motor is high, the motor cannot reliably stop working at a disconnection position due to inertia, so that the problem of unreliable reset can be caused.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects in the prior art, the invention provides a brushless direct current motor with a reset device for a windshield wiper, which solves the problems of unreliable reset and limited service life of a microswitch in the prior art.
The technical scheme of the invention is as follows: a brushless DC motor with a reset device for a windshield wiper comprises a brushless DC motor body; the method is characterized in that: one end of an output shaft of the brushless direct current motor body is provided with a reset device, and the reset device comprises a reset shell, reset Hall magnetic steel, a reset Hall element, a speed reducing device and a gear disc;
the gear disc, the speed reducer and the reset shell are sequentially coaxially sleeved on the output shaft; the center hole of the gear disc is connected with the output shaft through a bearing, the outer edge of one end face of the gear disc is connected with the shell of the brushless direct current motor body, and the outer edge of the other end face of the gear disc is connected with the opening end of the reset shell; the end head of the output shaft extends out of the central hole in the bottom surface of the shell and is connected with the wiper arm;
the speed reducer is positioned in the shell and comprises a reset cam, a first cylindrical gear and a second cylindrical gear; the center hole of the reset cam is coaxially sleeved on the output shaft, one end of the reset cam, facing the bottom of the reset shell, is of a cam structure, one end of the reset cam, facing the gear disc, is of a cylindrical gear, and the middle part of the reset cam is provided with a shaft shoulder; the cylindrical gear, the first cylindrical gear and the second cylindrical gear are meshed in sequence to realize the speed reduction function of the motor;
the reset Hall magnetic steel is of a block-shaped structure and is embedded on the outer peripheral surface of the shaft shoulder of the reset cam; the reset Hall element is fixed on the gear plate and is arranged opposite to the reset Hall magnetic steel; when the reset Hall element senses the reset Hall magnetic steel signal at the reset position, the output level of the reset Hall element can be reversed, and the motor is powered off and stops at the reset position.
The further technical scheme of the invention is as follows: the reset Hall element is a switch type integrated circuit.
The further technical scheme of the invention is as follows: when the reset Hall magnetic steel rotates to be opposite to the reset Hall element, the distance between the reset Hall magnetic steel and the reset Hall element is 0.5 mm-2 mm.
The further technical scheme of the invention is as follows: a rectangular groove is formed in the peripheral surface of a shaft shoulder of the reset cam, and the reset Hall magnetic steel is fixed in the rectangular groove through 704 glue.
Advantageous effects
The invention has the beneficial effects that: the invention integrates the speed reducer and the motor, and the micro switch originally used for realizing reset is replaced by a Hall element and a reset magnetic steel structure, so that the reset is more reliable and the service life is longer. When the windshield wiper gives a reset instruction, the motor can continue to rotate to ensure that the windshield wiper moves to a required position, and the Hall element senses the Hall magnetic steel and feeds back a signal, so that the controller controls the motor to be powered off, and the motor stops working.
The device can be used on similar products, and only the reduction ratio of the speed reducer is required to be adjusted, so that the generalization of the reset device is realized.
Drawings
Fig. 1 is a sectional schematic view of the resetting device.
Fig. 2 is a cutaway view of a brushless dc motor.
Description of reference numerals: 1-reset Hall magnetic steel, 2-reset Hall element, 3-speed reducing device, 4-reset cam, 5-gear, 6-gear disc, 7-shell component, 8-rotor component, 9-rear end cover component, 10-output shaft gear, 11-position magnetic steel, 12-Hall circuit board, 13-reset shell, 14-first cylindrical gear and 15-second cylindrical gear.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1 and 2, a brushless dc motor for a windshield wiper with a restoring device according to the present invention includes a brushless dc motor body; one end of an output shaft of the brushless direct current motor body is provided with a reset device, and the reset device comprises a reset shell 13, reset Hall magnetic steel 1, a reset Hall element 2, a speed reduction device 3 and a gear disc 6;
the gear disc 6, the speed reducer 3 and the reset shell 13 are sequentially coaxially sleeved on the output shaft; the central hole of the gear disc 6 is connected with the output shaft through a bearing, the outer edge of one end face of the gear disc is connected with the shell of the brushless direct current motor body, and the outer edge of the other end face of the gear disc is connected with the opening end of the reset shell 13; the end of the output shaft extends out of the center hole of the bottom surface of the reset shell 13 and is connected with the wiper arm;
the speed reducer 3 is positioned in the reset shell and comprises a reset cam 4, a first cylindrical gear 14 and a second cylindrical gear 15; the center hole of the reset cam 4 is coaxially sleeved on the output shaft, one end of the reset cam facing the bottom of the reset shell 13 is of a cam structure, one end of the reset cam facing the gear disc 6 is of a cylindrical gear, and the middle part of the reset cam is provided with a shaft shoulder; the cylindrical gear, the first cylindrical gear 14 and the second cylindrical gear 15 are meshed in sequence, the reduction ratio is designed to be the same as the reduction ratio of the windshield wiper, the speed reduction function of the motor is achieved, and the position of the windshield wiper can be effectively monitored.
The gear of the reduction gear 3 has 3 levels, the first level is the output shaft gear 10, drives the gear combination to rotate, the last level is the reset cam, the cam is provided with a groove, and the Hall magnet steel that will reset is glued in the reset cam groove through 704.
The reset Hall magnetic steel 1 is of a block-shaped structure and is embedded on the outer peripheral surface of a shaft shoulder of the reset cam 4; reset hall element 2 is fixed in on the toothed disc 6 to set up with 1 relative positions of reset hall magnet steel, reset hall element 2 chooses for use switch type integrated circuit. After a reset instruction is given, when the reset Hall element 2 senses a reset Hall magnetic steel 1 signal of the reset position, the output level of the reset Hall element 2 can be reversed, and the motor is powered off and stops at the reset position.
When the reset Hall magnetic steel rotates to be opposite to the reset Hall element, the distance between the reset Hall magnetic steel and the reset Hall element is 0.5 mm-2 mm.
The brushless direct current motor body is in the prior art and comprises a shell component 7, a rotor component 8, a rear end cover component 9, position magnetic steel 11, a Hall circuit board 12 and a motor driver; the shell component 7 consists of a motor stator coil and a shell, and the stator coil is a three-phase winding coil of the brushless motor; the rotor assembly 8 consists of a rotating shaft, position magnetic steel and a magnetic steel sheath, and an output shaft gear is arranged on the rotating shaft; the rear end cover assembly 9 mainly comprises a rear end cover and a Hall circuit board. The stator coil is installed in the housing cavity through the housing component 7 by a hot pressing method, and the rotor component is formed by adhering 4 tile-shaped magnetic steels to the rotating shaft through 704 glue.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (4)
1. A brushless DC motor with a reset device for a windshield wiper comprises a brushless DC motor body; the method is characterized in that: one end of an output shaft of the brushless direct current motor body is provided with a reset device, and the reset device comprises a reset shell, reset Hall magnetic steel, a reset Hall element, a speed reducing device and a gear disc;
the gear disc, the speed reducer and the reset shell are sequentially coaxially sleeved on the output shaft; the center hole of the gear disc is connected with the output shaft through a bearing, the outer edge of one end face of the gear disc is connected with the shell of the brushless direct current motor body, and the outer edge of the other end face of the gear disc is connected with the opening end of the reset shell; the end of the output shaft extends out of the center hole in the bottom surface of the reset shell and is connected with the wiper arm;
the speed reduction device is positioned in the reset shell and comprises a reset cam, a first cylindrical gear and a second cylindrical gear; the center hole of the reset cam is coaxially sleeved on the output shaft, one end of the reset cam, facing the bottom of the reset shell, is of a cam structure, one end of the reset cam, facing the gear disc, is of a cylindrical gear, and the middle part of the reset cam is provided with a shaft shoulder; the cylindrical gear, the first cylindrical gear and the second cylindrical gear are meshed in sequence to realize the speed reduction function of the motor;
the reset Hall magnetic steel is of a block-shaped structure and is embedded on the outer peripheral surface of the shaft shoulder of the reset cam; the reset Hall element is fixed on the gear plate and is arranged opposite to the reset Hall magnetic steel; when the reset Hall element senses the reset Hall magnetic steel signal at the reset position, the output level of the reset Hall element can be reversed, and the motor is powered off and stops at the reset position.
2. A brushless dc motor for a windshield wiper with a resetting device according to claim 1, wherein: the reset Hall element is a switch type integrated circuit.
3. A brushless dc motor for a windshield wiper with a resetting device according to claim 1, wherein: when the reset Hall magnetic steel rotates to be opposite to the reset Hall element, the distance between the reset Hall magnetic steel and the reset Hall element is 0.5 mm-2 mm.
4. A brushless dc motor for a windshield wiper with a resetting device according to claim 1, wherein: a rectangular groove is formed in the peripheral surface of a shaft shoulder of the reset cam, and the reset Hall magnetic steel is fixed in the rectangular groove through 704 glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022797234.7U CN213937711U (en) | 2020-11-27 | 2020-11-27 | Brushless DC motor with reset device for windshield wiper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022797234.7U CN213937711U (en) | 2020-11-27 | 2020-11-27 | Brushless DC motor with reset device for windshield wiper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213937711U true CN213937711U (en) | 2021-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022797234.7U Active CN213937711U (en) | 2020-11-27 | 2020-11-27 | Brushless DC motor with reset device for windshield wiper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213937711U (en) |
-
2020
- 2020-11-27 CN CN202022797234.7U patent/CN213937711U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Brushless DC motor for windshield wiper with reset device Effective date of registration: 20211229 Granted publication date: 20210810 Pledgee: AVIC Finance Co.,Ltd. Xi'an Branch Pledgor: XI'AN QING'AN ELECTRIC CONTROL Co.,Ltd. Registration number: Y2021980017053 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230106 Granted publication date: 20210810 Pledgee: AVIC Finance Co.,Ltd. Xi'an Branch Pledgor: XI'AN QING'AN ELECTRIC CONTROL Co.,Ltd. Registration number: Y2021980017053 |