CN201773111U - Multi-magnet bias inertial impaction sensor - Google Patents
Multi-magnet bias inertial impaction sensor Download PDFInfo
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- CN201773111U CN201773111U CN2010205069814U CN201020506981U CN201773111U CN 201773111 U CN201773111 U CN 201773111U CN 2010205069814 U CN2010205069814 U CN 2010205069814U CN 201020506981 U CN201020506981 U CN 201020506981U CN 201773111 U CN201773111 U CN 201773111U
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Abstract
The utility model discloses a multi-magnet bias inertial impaction sensor, which generates magnetic attraction force for a ferromagnetic steel ball (3) by the aid of two or more same rare-earth permanent magnets (4). The steel ball (3) can move inside a sliding sleeve (6); and the permanent magnets (4) magnetized along the direction of a moving pipeline of the steel ball (3) are axially symmetrically arrayed along the center of the moving direction of the steel ball (3). The sensor is low in threshold temperature coefficient, simultaneously leads the bias magnetism of the sensor to stably change along with position change of the steel ball, is accurate in acceleration threshold control, and avoids potential safety hazards caused by false signals transmitted by the sensor.
Description
Technical field
The utility model relates to a kind of sensor, particularly a kind of inertial collision sensor of many magnets.
Background technology
Sensor is widely used in the igniting judgement of safe automobile air bag.United States Patent (USP) 4329549 discloses a kind of inertia-type crash sensor that is used to judge car crass, is used for the control of safe automobile air bag.This kind sensor is used to conduct electricity the reed contact that contacts and forms with one group by a ring-shaped magnet, cylindrical pipe, steel ball.Described sensor generally can only use the ferrite permanent-magnet materials of low magnetic energy product to make because the annular permanent magnet volume is bigger, and the magnetic force that provides is bigger.But the temperature coefficient of ferrite permanent-magnet is big, the remanent magnetism temperature coefficient reaches-0.2%/℃.In the scope of working range-40 that automobile requires ℃～125 ℃, its remanent magnetism changes maximum can reach about 20%, and its remanent magnetism changes and acutely causes the sensor acceleration rate threshold to produce than large deviation.Sensor easily sends rub-out signal, causes potential safety hazard.
The remanent magnetism temperature coefficient of rare earth permanent magnet is lower, be generally-0.03～0.1%/℃, but its magnetic property is very strong, and magnetic energy product reaches 8～12 times of ferrite permanent-magnet, uses the annular permanent magnet structure then can make its biasing magnetic force excessive, can not satisfy the automobile request for utilization.On the other hand, if dwindle the annular permanent magnet size significantly, substitute the sensor of annular permanent magnet as the single disc rare-earth permanent magnet of existing use, change violent problem though solved remanent magnetism, but its biasing magnetic force sharply changes along with the change in location of steel ball, acceleration rate threshold control is difficulty still, also easily produces potential safety hazard.
The utility model content
The technical problems to be solved in the utility model provides a kind of many magnet biasing inertial collision sensors, and this sensor threshold values temperature coefficient is low, and its biasing magnetic force of while is smooth change along with the change in location of steel ball, and acceleration rate threshold control accurately.
For solving the problems of the technologies described above, the utility model uses the rare-earth permanent magnet that is equal to more than two or two that ferromagnetic steel ball is produced magnetic attracting force, described steel ball can move in sliding sleeve, described permanent magnet magnetizes along described steel ball motion tubes direction, and described permanent magnet is along this direction of motion central shaft symmetric offset spread of described steel ball.
Because be to adopt rare-earth permanent magnet that steel ball is produced attractive force, sensor threshold values temperature coefficient is low, acceleration rate threshold changes little.Simultaneously, owing to use the rare-earth permanent magnet that is equal to more than two or two that ferromagnetic steel ball is produced magnetic attracting force, described permanent magnet magnetizes along described steel ball motion tubes direction, and described permanent magnet is along this direction of motion central shaft symmetric offset spread of described steel ball.Therefore, the magnetic bias power that is subjected in the steel ball motion process by axisymmetric, be equal to permanent magnet and provide jointly along magnetized some of direction of motion, it is compared with the sensor of placing single disc rare-earth permanent magnet behind steel ball, magnetic bias power is along with the change in location of steel ball is less relatively, and acceleration rate threshold is accurately control easily.Avoid sensor to send rub-out signal, caused potential safety hazard.
As a kind of improvement of the present utility model, described sensor also has a balance bracket, this balance bracket is made by the soft magnetic material bar, be the U-type strip shape, be positioned at the described permanent magnet bottom and the described sliding sleeve outside, can improve the homogeneity of magnetic bias power in the steel ball motion process, strengthen the acceleration rate threshold control accuracy.
As another kind of improvement the of the present utility model, described sensor also has a radome, described radome is made by metal soft magnetic material, be tubular towards described steel ball direction of motion opening, cover described permanent magnet, steel ball and sliding sleeve, reduce the external magnetic field interference, strengthened the sensor antijamming capability.
Description of drawings
Fig. 1 is the constitutional diagram that many magnet biasing inertial collision sensors do not trigger.
Fig. 2 is the constitutional diagram that many magnet biasing inertial collision sensors have triggered.
Embodiment
In Fig. 1, selecting a diameter is that the ferromagnetism steel ball 3 of 8mm is arranged in sliding sleeve 6, and steel ball 3 and sliding sleeve 6 are closely cooperated, and steel ball 3 can be put the motion of 8 directions to Mechanical Contact.Two rare-earth permanent magnets that are equal to 4 at a distance of 5mm are positioned at that end opposite with steel ball 3 direction of motion, with steel ball 3 between centers at a distance of 1mm, permanent magnet 4 magnetizes along steel ball 3 motion tubes directions, and permanent magnet 4 is 180 ° along the angle of steel ball 3 direction of motion central shaft symmetric offset spread, 3 of permanent magnet 4 and magnetized steel balls have an attractive force, and this attractive force makes steel ball 3 be arranged in sliding sleeve 6 that end by permanent magnet 4.What fill in the middle of permanent magnet 4, sliding sleeve 6 is that injected plastics material 5,7 is contact reed and circuit tie point, and 9 for sealing with housing with the each part mentioned above sealing wherein.Under situations such as collision, when generation speed sharply changes, when acceleration reaches threshold value, inertial force continues to surpass biasing magnetic force will make steel ball 3 leave initial position in the sliding sleeve 6, roll to the other end, arrive mechanical contact 8 back generation extruding and make tie point 7 conductings, the conducting decision circuitry provides Continuity signal.At this moment, sensor is in state shown in Figure 2.Because permanent magnet 4 magnetizes along steel ball 3 motion tubes directions, and permanent magnet 4 is along steel ball 3 direction of motion central shaft symmetric offset spread, the magnetic bias power that is subjected in steel ball 3 motion processes by axisymmetric, be equal to permanent magnet 4 and provide jointly along magnetized some of direction of motion, magnetic bias power no longer sharply changes along with the change in location of steel ball 3, and acceleration rate threshold is accurately control easily.Avoided sensor to send the potential safety hazard that rub-out signal causes.
Further, as shown in Figure 1, can add a balance bracket 2, balance bracket 2 is made by the soft magnetic material bar, is the U-type strip shape, is positioned at permanent magnet 4 bottoms and sliding sleeve 6 outsides, can improve the homogeneity of magnetic bias power in steel ball 3 motion processes, strengthen the acceleration rate threshold control accuracy.
Further, as shown in Figure 1, also can add a radome 1, radome 1 is made by metal soft magnetic material, is the tubular towards steel ball 3 direction of motion openings, covers permanent magnet 4, steel ball 3 and sliding sleeve 6, reduce the external magnetic field interference, strengthened the sensor antijamming capability.
When permanent magnet 4 was 3, permanent magnet 4 was 120 ° along the angle of steel ball 3 direction of motion central shaft symmetric offset spread, and during for n spare, the angle of symmetric offset spread is 360/n °.Permanent magnet 4 and steel ball 3 axial distance preferred values are 0～1 times of steel ball 3 diameters, and 4 of permanent magnets are 0.2～1 times of steel ball 3 diameters apart from preferred value.Permanent magnet 4 when n is even number, also can be that the N-S of opposed polarity is staggered apart from N-N, the S-S utmost point that steel ball 3 nearest surfaces can be same polarities.
Claims (5)
1. magnet more than kind biasing inertial collision sensor, it is characterized in that: use the rare-earth permanent magnet (4) that is equal to more than two or two that ferromagnetic steel ball (3) is produced magnetic attracting force, described steel ball (3) can move in sliding sleeve (6), described permanent magnet (4) is along the magnetization of described steel ball (3) motion tubes direction, and described permanent magnet (4) is along this direction of motion central shaft symmetric offset spread of described steel ball (3).
2. many magnet biasing inertial collision sensors according to claim 1, it is characterized in that: described permanent magnet (4) is positioned at and that opposite end of described steel ball (3) direction of motion, with described steel ball (3) axial distance be 0～1 times of this steel ball size, distance is 0.2～1 times of described steel ball (3) diameter between described permanent magnet (4).
3. many magnet biasing inertial collision sensors according to claim 1 and 2, it is characterized in that: described sensor also has a balance bracket (2), this balance bracket (2) is made by the soft magnetic material bar, is the U-type strip shape, is positioned at described permanent magnet (4) bottom and described sliding sleeve (6) outside.
4. many magnet biasing inertial collision sensors according to claim 1 and 2, it is characterized in that: described sensor also has a radome (1), described radome (1) is made by metal soft magnetic material, be tubular, cover described permanent magnet (4), steel ball (3) and sliding sleeve (6) to described steel ball (3) direction of motion opening.
5. many magnet biasing inertial collision sensors according to claim 3, it is characterized in that: described sensor also has a radome (1), described radome (1) is made by metal soft magnetic material, be tubular, cover described permanent magnet (4), steel ball (3), sliding sleeve (6) and balance bracket (2) to described steel ball (3) direction of motion opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205069814U CN201773111U (en) | 2010-08-27 | 2010-08-27 | Multi-magnet bias inertial impaction sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205069814U CN201773111U (en) | 2010-08-27 | 2010-08-27 | Multi-magnet bias inertial impaction sensor |
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| Publication Number | Publication Date |
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| CN201773111U true CN201773111U (en) | 2011-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205069814U Expired - Fee Related CN201773111U (en) | 2010-08-27 | 2010-08-27 | Multi-magnet bias inertial impaction sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106158504A (en) * | 2015-03-31 | 2016-11-23 | 黄志恒 | Multi-direction sensor |
| CN106290981A (en) * | 2015-05-20 | 2017-01-04 | 联想(北京)有限公司 | A kind of acceleration labelling apparatus and acceleration marking arrangement |
| CN107966982A (en) * | 2016-10-18 | 2018-04-27 | 苏州宝时得电动工具有限公司 | Collide trigger device and grass trimmer |
| US10161955B2 (en) | 2015-03-11 | 2018-12-25 | Chih-Heng Huang | Multi-directional sensor |
-
2010
- 2010-08-27 CN CN2010205069814U patent/CN201773111U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10161955B2 (en) | 2015-03-11 | 2018-12-25 | Chih-Heng Huang | Multi-directional sensor |
| CN106158504A (en) * | 2015-03-31 | 2016-11-23 | 黄志恒 | Multi-direction sensor |
| CN106290981A (en) * | 2015-05-20 | 2017-01-04 | 联想(北京)有限公司 | A kind of acceleration labelling apparatus and acceleration marking arrangement |
| CN106290981B (en) * | 2015-05-20 | 2020-02-21 | 联想(北京)有限公司 | Acceleration marking device and acceleration marking equipment |
| CN107966982A (en) * | 2016-10-18 | 2018-04-27 | 苏州宝时得电动工具有限公司 | Collide trigger device and grass trimmer |
| CN107966982B (en) * | 2016-10-18 | 2021-02-09 | 苏州宝时得电动工具有限公司 | Collision trigger device and lawn mower |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Wu Wenqun Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
Addressee: Wu Wenqun Document name: Notification of Termination of Patent Right |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110323 Termination date: 20150827 |
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| EXPY | Termination of patent right or utility model |