CN202041544U - Non-contact vehicle speed sensor - Google Patents
Non-contact vehicle speed sensor Download PDFInfo
- Publication number
- CN202041544U CN202041544U CN2011201640863U CN201120164086U CN202041544U CN 202041544 U CN202041544 U CN 202041544U CN 2011201640863 U CN2011201640863 U CN 2011201640863U CN 201120164086 U CN201120164086 U CN 201120164086U CN 202041544 U CN202041544 U CN 202041544U
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- CN
- China
- Prior art keywords
- cylinder body
- hall device
- vehicle speed
- cylindrical shell
- baffle
- 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 - Fee Related
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Abstract
The utility model relates to a sensor for measuring vehicle speed, in particular to a non-contact vehicle speed sensor, which overcomes shortcomings that the sensor is high in fault rate and short in service life caused by abrasion existing in the prior art, is used for measuring vehicle speed, and comprises a Hall device, a front baffle, a cylinder body, a filter shaping circuit and a rear baffle. The front baffle is fixed at the front end of the cylinder body, and the front end of the cylinder body is sealed by the front baffle. The rear baffle is fixed at the rear end of the cylinder body, and the rear end of the cylinder body is sealed by the rear baffle. The Hall device is fixed inside the cylinder body and attached to the front baffle, the signal output end of the Hall device is connected with the signal input end of the filter shaping circuit. Due to a fact that the cylinder is arranged close to a gear top of a change gear instead of contacting with the gear top of the change gear, mutual abrasion is avoided. Rotating speed of the change gear is not required to be transferred by a worm wheel-worm transmisson system, thereby saving the transmission system, simplifying structure, and being high in working reliability and long in service life.
Description
Technical field
The utility model relates to a kind of sensor of measuring the speed of a motor vehicle.
Background technology
The existing mode of measuring motor vehicle speed all is the rotating speed of speed gear in the wheel box to be delivered in the touch sensor by the turbine and worm kinematic train test the speed.Described touch sensor is made up of a Hall element and a part that is equiped with the ferromagnetism device, the part that is equiped with the ferromagnetism device is set up drive connection and rotation by the speed gear in turbine and worm kinematic train and the wheel box, Hall element maintains static, periodically slip over Hall element by the ferromagnetism device, the umber of pulse that Hall element produces in digit's time, thus relative rotation speed between the two obtained.But because wheel box is in contact with one another with being equiped with between the part of ferromagnetism device, thus there is wear problems, sensor spoilage height, lack serviceable life.
The utility model content
The purpose of this utility model provides a kind of contactless vehicle speed sensor, makes the defective of lacking in sensor spoilage height, serviceable life to solve prior art because of there being wearing and tearing.It comprises hall device 1, front apron 2, cylindrical shell 3, filtering shaping circuit 4 and backboard 5, front apron 2 is fixed on the leading section of cylindrical shell 3 and with the sealing of the front end of cylindrical shell 3, backboard 5 is fixed on the rearward end of cylindrical shell 3 and with the back-end closure of cylindrical shell 3, hall device 1 is fixed in the cylindrical shell 3 and with front apron 2 and pastes mutually, and the signal output part of hall device 1 is connected on the signal input part of filtering shaping circuit 4.
During work, the front end of cylindrical shell 3 is fixed near the tooth top of speed gear 6 in the motor vehicle gearbox and relative with tooth top, because speed gear 6 is steel gears, and the tooth and the backlash of gear mass replace even variation, the cyclical variation of ferromagnetic material that occurs after the rotation of speed gear 6 and hall device 1 distance will inevitably cause that the electric signal of hall device 1 output periodically changes, because the number of teeth of speed gear 6 is certain, export the number of teeth that the periodically variable number of times of electric signal equals speed gear 6 when hall device 1, just be equivalent to speed gear 6 and make a circle.Thereby can access the number of turns that unit interval internal speed-changing gear 6 changes, and then the speed of a motor vehicle of computing machine motor-car.Near the not contact with it because the utility model middle cylinder body 3 just places the tooth top of speed gear 6, therefore mutual wear problems can not appear, again because do not need the rotating speed of speed gear by the transmission of turbine and worm kinematic train, saved kinematic train, simplify the structure, the reliability height of work, long service life.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Embodiment one: specify present embodiment below in conjunction with Fig. 1.Present embodiment comprises hall device 1, front apron 2, cylindrical shell 3, filtering shaping circuit 4 and backboard 5, front apron 2 is fixed on the leading section of cylindrical shell 3 and with the sealing of the front end of cylindrical shell 3, backboard 5 is fixed on the rearward end of cylindrical shell 3 and with the back-end closure of cylindrical shell 3, hall device 1 is fixed in the cylindrical shell 3 and with front apron 2 and pastes mutually, and the signal output part of hall device 1 is connected on the signal input part of filtering shaping circuit 4.Filtering shaping circuit 4 can the external various wave interference of filtering.Follow-up usage counter just can be counted waveform signal.Front apron 2 uses non-magnet materials, such as copper, avoids reason such as magnetic hysteresis to cause the insensitive of signals collecting.Cylindrical shell 3 can use steel material, reduces cost, and can also shield other electromagnetic interference (EMI).
Embodiment two: the difference of present embodiment and embodiment one is that hall device 1 uses back of the body magnetic hall device.It is wide that back of the body magnetic hall device has serviceability temperature, and the advantage that the resisting temperature interference performance is strong is suitable for bad working environment in the motor vehicle.
Claims (2)
1. contactless vehicle speed sensor, it is characterized in that it comprises hall device (1), front apron (2), cylindrical shell (3), filtering shaping circuit (4) and backboard (5), front apron (2) is fixed on the leading section of cylindrical shell (3) and with the sealing of the front end of cylindrical shell (3), backboard (5) is fixed on the rearward end of cylindrical shell (3) and with the back-end closure of cylindrical shell (3), hall device (1) is fixed in the cylindrical shell (3) and with front apron (2) and pastes mutually, and the signal output part of hall device (1) is connected on the signal input part of filtering shaping circuit (4).
2. contactless vehicle speed sensor according to claim 1 is characterized in that hall device (1) uses back of the body magnetic hall device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201640863U CN202041544U (en) | 2011-05-20 | 2011-05-20 | Non-contact vehicle speed sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201640863U CN202041544U (en) | 2011-05-20 | 2011-05-20 | Non-contact vehicle speed sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202041544U true CN202041544U (en) | 2011-11-16 |
Family
ID=44968982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201640863U Expired - Fee Related CN202041544U (en) | 2011-05-20 | 2011-05-20 | Non-contact vehicle speed sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202041544U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106164543A (en) * | 2014-04-04 | 2016-11-23 | 捷豹路虎有限公司 | The velocity sensor of transmission for vehicles |
| CN108369241A (en) * | 2015-12-09 | 2018-08-03 | 罗伯特·博世有限公司 | Device for the wheel speed for calculating vehicle |
-
2011
- 2011-05-20 CN CN2011201640863U patent/CN202041544U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106164543A (en) * | 2014-04-04 | 2016-11-23 | 捷豹路虎有限公司 | The velocity sensor of transmission for vehicles |
| CN106164543B (en) * | 2014-04-04 | 2018-09-04 | 捷豹路虎有限公司 | The velocity sensor of transmission for vehicles |
| CN108369241A (en) * | 2015-12-09 | 2018-08-03 | 罗伯特·博世有限公司 | Device for the wheel speed for calculating vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111116 Termination date: 20140520 |