CN201653431U

CN201653431U - Non-contact vehicle gear position sensor

Info

Publication number: CN201653431U
Application number: CN2010201407440U
Authority: CN
Inventors: 张肖康; 周守元; 周革
Original assignee: HEFEI BANGLI ELECTRONIC CO Ltd
Current assignee: HEFEI BANGLI ELECTRONIC CO Ltd
Priority date: 2010-03-25
Filing date: 2010-03-25
Publication date: 2010-11-24
Anticipated expiration: 2020-03-25

Abstract

The utility model relates to a non-contact vehicle gear position sensor. The axial top of a shell of the non-contact vehicle gear position sensor is provided with an upper cover board. The axial bottom of the shell is provided with a lower cover board. The inside of the upper cover board is provided with a circuit board. The circuit board is connected with a Hall chip. The Hall chip is positioned in the shell. The outside of the Hall chip is provided with a hollow rotating shaft. The upper part of the hollow rotating shaft corresponding to the Hall chip is sleeved with a magnetic conductive ring. One side wall inside the magnetic conductive ring is connected with a magnet. The magnet corresponds to the Hall chip. The middle part outside the hollow rotating shaft is radially provided with a positioning ring. The hollow rotating shaft on the lower part of the positioning ring is sleeved with a reset spring. The upper end and the lower end of the reset spring are positioned on the positioning ring and the lower cover board. The utility model solves the contact wear problem, greatly prolongs the working life of the sensor and improves reliability and safety of work.

Description

Contactless automobile gear position sensor

Technical field

The utility model belongs to sensor technical field, is specifically related to the automobile gear position sensor.

Background technology

Power type mechanical automatic gearbox (AMT) is the manual transmission based on routine, and additional one overlaps electric control gear, thereby can control the clutch coupling and the shift bar of manual transmission automatically, and making the separation of clutch coupling all is automatic with engaging.The AMT wheel box combines the high and easy to operate advantage of automatic gear-box of mechanical gear box transmission efficiency, all is widely used on all kinds of automobiles.

The AMT wheel box is realized the mobile gear shift of speed-changing box pulling fork axle and the joint of swing gear shift and clutch coupling by the control to the motor rotational angle.Gear position sensor is a most important observing and controlling link in the AMT speed change system, and whether the measurement of gear position sensor has accurately determined reliability, the security of AMT wheel box and the ride comfort of controlling.

Traditional gear position sensor adopts the pot principle mostly, changes resistance value by metallic brush and resistance substrate sliding contact, thereby changes output voltage signal.The contact gear position sensor frequently slides owing to the contact, parts are easy to generate wearing and tearing, come in contact the phenomenons such as deviation of bad or output resistance easily, cause the signal can't normal transmission, be restricted serviceable life, and owing to the vibration of automobile, contact chip may produce moment disengagement, loose contact simultaneously, thereby cause sensor failure, damage, and the output linearity also is difficult to control.

The utility model content

In order to solve the loose contact that causes easy to wear, the easy problem that lost efficacy that existing contact gear position sensor exists, the utility model provides a kind of contactless automobile gear position sensor.

The specific design technical scheme is as follows:

Contactless automobile gear position sensor comprises the housing 1 of cylindrical tube shape, and the axial top of housing 1 is provided with upper cover plate 2, and axially the bottom is provided with lower cover 8; Upper cover plate 2 inboards are provided with wiring board 4, connecting Hall chip 3 on the wiring board 4, Hall chip 3 is positioned at housing 1, the outside of Hall chip 3 is provided with hollow rotating shaft 5, be arranged with magnetic guiding loop 6 with Hall chip 3 corresponding hollow rotating shafts 5 tops, a sidewall is connecting magnet 9 in the magnetic guiding loop 6, and magnet 9 is corresponding with Hall chip 3; Hollow rotating shaft 5 outer middle side parts radially are provided with centring ring, are arranged with back-moving spring 7 on the hollow rotating shaft 5 of centring ring bottom, and the top and bottom of back-moving spring 7 lay respectively on centring ring and the lower cover 8.

The centring ring upper surface of described hollow rotating shaft 5 outer middle side parts is laid with plural grab, is set on the hollow rotating shaft 5 magnetic guiding loop 6 and is blocked by grab.

Described centring ring lower surface is provided with the location and goes up annular groove, and the medial surface of described lower cover 8 is provided with down annular groove, and the top and bottom of back-moving spring are positioned at the location and go up annular groove and following annular groove.

Described housing 1 an outside side is provided with an electric interfaces that links to each other with the outside, is connecting mounting lug respectively on the housing 1 of lower cover 8 both sides, and mounting lug is provided with mounting hole.

Useful technique effect of the present utility model embodies in the following areas:

1, this sensor has solved the contact wear problem, has prolonged mission life greatly;

2, this sensor has the favorable linearity output characteristics, makes output signal more accurate and more stable;

3, the Hall chip of this sensor employing has programmable functions, can change output voltage parameter flexibly according to requirement of client;

4, the Hall chip that adopts of this sensor has temperature compensation function, and when the magnetic field intensity of magnet was drifted about along with variation of temperature, chip can be automatically compensates and proofreaies and correct the drift in magnetic field.The market application foreground of this utility model is very wide, can substitute traditional touch sensor on a large scale, especially in the application of automotive electronics, this product can change shortcomings such as traditional touch sensor life-span weak point, failure rate height, will increase substantially the reliability and the security of system.

Description of drawings

Fig. 1 is the utility model structural representation,

Fig. 2 is the assembling explosive view of Fig. 1,

Fig. 3 is the utility model circuit diagram.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Embodiment:

Referring to Fig. 1 and Fig. 2, contactless automobile gear position sensor comprises the housing 1 of cylindrical tube shape, and the axial top of housing 1 is provided with upper cover plate 2, and axially the bottom is provided with lower cover 8; Upper cover plate 2 inboards are provided with wiring board 4, connecting Hall chip 3 on the wiring board 4, Hall chip 3 is positioned at housing 1, the outside of Hall chip 3 is provided with hollow rotating shaft 5, be arranged with magnetic guiding loop 6 with Hall chip 3 corresponding hollow rotating shafts 5 tops, a sidewall is connecting magnet 9 in the magnetic guiding loop 6, and magnet 9 is corresponding with Hall chip 3; Hollow rotating shaft 5 outer middle side parts radially are provided with centring ring, and the centring ring upper surface is laid with three grabs, and grab blocks the magnetic guiding loop 6 that is set on the hollow rotating shaft 5; Be arranged with back-moving spring 7 on the hollow rotating shaft 5 of centring ring bottom, the centring ring lower surface is provided with the location and goes up annular groove, and the medial surface of lower cover 8 is provided with down annular groove, and the top and bottom of back-moving spring are positioned at the location and go up annular groove and following annular groove.

Described housing 1 an outside side is installed with an electric interfaces that links to each other with the outside, is connecting mounting lug respectively on the housing 1 of lower cover 8 both sides, and mounting lug is provided with mounting hole.

The principle of work of this device is as follows:

By the change of Hall chip 3 with the relative angle of magnet 9, magnetic conduction sheet 6, thereby reach the purpose that changes sensor output voltage, be in contactless state between Hall chip 3 and the magnet 9, get up by the magnetic field shielding of magnetic guiding loop 6, guarantee by the magnitude of field intensity of Hall chip 3 and the stability of field signal with magnet 9; This sensor adopts the magnetic circuit of Hall chip 3, magnet 9, magnetic conduction sheet 6 compositions partly to have the very high linearity simultaneously, thereby has guaranteed the linearity of output voltage.

Hall chip 3, wiring board 4 are packed into behind housing 1 epicoele, fill up the epicoele of housing 1 with the silicon gel, avoided causing output signal the defective of deviation to occur, adopted the encapsulation of silicon gel to avoid simultaneously because the effect of expanding with heat and contract with cold that temperature variation causes causes the damage that is squeezed of Hall chip 3 and wiring board 4 because Vehicular vibration causes Hall chip 3 vibrations.

Referring to Fig. 3, between the power vd D of Hall chip and GND and met a capacitor C 0 and a Transient Suppression Diode TVS0, also and met a capacitor C 1 and a Transient Suppression Diode TVS1, C0 and C1 play the effect of EMC protection at this between the signal of Hall chip output OUT and GND;

The effect of TVS in this circuit mainly is when the two poles of the earth of TVS diode are subjected to reverse transient state high energy impact events; it can be with 10 the speed of bearing 12 second-times; the high impedance of its two interpolar is become Low ESR; the surge power of absorption up to thousands of watts; the voltage clamp that makes two interpolars is in a predetermined value; protect the Hall chip unit in the electronic circuit effectively; avoid the damage of various surge pulses; the TVS diode is added on signal and the power lead; can prevent the pulse of Hall chip because of moment; as the static discharge effect; the surge of AC power and Switching Power Supply that noise caused was malfunctioning, also can protect chip can avoid data and control bus to be subjected to the unnecessary noise influence simultaneously.

Claims

1. contactless automobile gear position sensor is characterized in that: comprise the housing (1) of cylindrical tube shape, the axial top of housing (1) is provided with upper cover plate (2), and axially the bottom is provided with lower cover (8); Upper cover plate (2) inboard is provided with wiring board (4), connecting Hall chip (3) on the wiring board (4), Hall chip (3) is positioned at housing (1), the outside of Hall chip (3) is provided with hollow rotating shaft (5), be arranged with magnetic guiding loop (6) with the corresponding hollow rotating shaft of Hall chip (3) (5) top, a sidewall is connecting magnet (9) in the magnetic guiding loop (6), and magnet (9) is corresponding with Hall chip (3); The outer middle side part of hollow rotating shaft (5) radially is provided with centring ring, is arranged with back-moving spring (7) on the hollow rotating shaft of centring ring bottom (5), and the top and bottom of back-moving spring (7) lay respectively on centring ring and the lower cover (8).

2. contactless automobile gear position sensor according to claim 1 is characterized in that: the centring ring upper surface of the outer middle side part of described hollow rotating shaft (5) is laid with plural grab, is set in the last magnetic guiding loop (6) of hollow rotating shaft (5) and is blocked by grab.

3. contactless automobile gear position sensor according to claim 1, it is characterized in that: described centring ring lower surface is provided with the location and goes up annular groove, the medial surface of described lower cover (8) is provided with down annular groove, and the top and bottom of back-moving spring are positioned at the location and go up annular groove and following annular groove.

4. contactless automobile gear position sensor according to claim 1, it is characterized in that: the outside side of described housing (1) is provided with an electric interfaces that links to each other with the outside, connecting mounting lug respectively on the housing (1) of lower cover (8) both sides, mounting lug is provided with mounting hole.