CN102156197B

CN102156197B - Speed sensor

Info

Publication number: CN102156197B
Application number: CN2011100463832A
Authority: CN
Inventors: 赵建飞; 储贵庭
Original assignee: Hamlin Electronics Suzhou Co Ltd
Current assignee: Hamlin Electronics Suzhou Co Ltd
Priority date: 2011-02-25
Filing date: 2011-02-25
Publication date: 2012-08-22
Anticipated expiration: 2031-02-25
Also published as: CN102156197A

Abstract

The invention discloses a speed sensor comprising a printed circuit board which is connected with positioning plastics; a Hall chip and a permanent magnet which are fixed together are arranged in the positioning plastics; an infiltration pore is arranged on the inner side wall of the positioning plastics; at least four ribs are arranged on the inner side wall of the positioning plastics; the ribs keep away from the Hall chip and are in interference fit with the permanent magnet; the printed circuit board and the positioning plastics are connected and positioned in an internal fixing manner; and the Hall chip and a transmission gear are in center alignment. The speed sensor is arranged in the positioning plastics, has good sealing performance, and is beneficial to the performances of solidification, shockproofing and electromagnetic compatibility and the like; and by the speed sensor, the mechanical properties and the electric properties of products can be improved.

Description

Speed pickup

Technical field

The present invention relates to a kind of speed pickup, relate in particular to a kind of speed pickup that is used for two contactless velocity surveys of clutch gearbox transmission shaft.

Background technology

Two clutch gearboxes (DCT) are also claimed direct manual transmission (DSG), on transmission efficiency and manufacturing cost, all have outstanding advantage, but its inner structure is very complicated.DCT is made up of following major part: its body part mountain shift gear, main driven shaft, bearing, synchronizer, shift fork, housing etc. are formed, and the axle sleeve axle construction technology content that is adopted is very high; The information that electronic control unit is sent to according to each ECU on each sensor and the CAN bus; Judge the gearshift demand; And calculate and select best gearshift opportunity according to setting program, and send shifting commands, let the gearshift performance element accomplish the gearshift action; The gearshift performance element is converted into the hydraulic machinery action to the instruction of TCU, promotes the clutch of double clutch and the slippage of selector fork and finally realizes self shifter and speed change.The transmission shaft of DCT speed pickup and permanent magnet rotate, and utilize constantly switching on and off of permanent magnet and Hall chip, convert speed parameter to electric signal.At present; The structure of DCT speed pickup is as depicted in figs. 1 and 2, and permanent magnet 11 relatively seals with location plastic cement 13 designs of Hall chip 12, and it is inner that glue is difficult for being penetrated into the location plastic cement on every side; Printed circuit board (PCB) 14 and location cooperating between the plastic cement 13 is also insecure; Cause product hermeticity, curing and against shock relatively poor, electromagnetic compatibility (EMC) performance is low, influences speed pickup machinery, electric property.

Summary of the invention

In view of the defective that above-mentioned prior art exists, the objective of the invention is to propose a kind of speed pickup of simple in structure, good seal performance.

The object of the invention will be achieved through following technical scheme:

A kind of speed pickup; Comprise a printed circuit board (PCB); Said printed circuit board (PCB) is connected with the location plastic cement, and Hall chip and the permanent magnet that has been fixed together is installed in the plastic cement of said location, is provided with the permeability hole that is used for encapsulating between the outer wall of said location plastic cement madial wall and said permanent magnet.

Further, above-mentioned speed pickup, wherein: be arranged with at least 4 ribs on the madial wall of said location plastic cement, said rib is avoided said Hall chip, with said permanent magnet interference fit.

Further, above-mentioned speed pickup, wherein: said rib is arranged on the left and right sides of the madial wall of location plastic cement.

Further; Above-mentioned speed pickup; Wherein: said printed circuit board (PCB) adopts inner fixing mode to be connected the location with the location plastic cement, and longitudinal extension has holding body on the plastic cement of said location, and said holding body is provided with the fixture block chimeric with printed circuit board (PCB) near an end of location plastic cement; The other end is provided with register pin, and said printed circuit board (PCB) is provided with the pilot hole corresponding with said register pin; Said holding body horizontal expansion has a cramping body, and said cramping body comprises 2 clamping limbs that are oppositely arranged, and said clamping limb is provided with the accepting groove of accommodating printed circuit board (PCB), engages with said printed circuit board (PCB) through accepting groove.

Further, above-mentioned speed pickup, wherein: the center-aligned of said Hall chip and transmission gear.

Outstanding effect of the present invention is:

1, locating increase glue permeability hole on the plastic cement, can let glue about reaching up and down, fully get into plastic cement inside, location, good seal performance helps curing, against shock, electromagnetic compatibility performances such as (EMC), raising product machinery and electric property;

2, because the synthetic part of Hall chip and permanent magnet; The drafting angle of permanent magnet is bigger, has increased the fixing design of rib, and this fixing position and permanent magnet interference fit; Avoid the top Hall chip, avoided Hall chip to influence product quality because of stress deformation;

3, printed circuit board (PCB) (PCB) adopts inner fixing locator meams with the location plastic cement, reduces the product design space, and can improve product assembling reliability;

4, chip design and transmission gear center-aligned have improved the induction sensitivity of product.

Following constipation closes the embodiment accompanying drawing, and specific embodiments of the invention is done further to detail, so that technical scheme of the present invention is easier to understand, grasp.

Description of drawings

Fig. 1 is the structural representation of the speed pickup of prior art;

Fig. 2 is the front view of the speed pickup of prior art;

Fig. 3 is the structural representation of the speed pickup of the embodiment of the invention;

Fig. 4 is the front view of the speed pickup of the embodiment of the invention;

Fig. 5 is the partial sectional view of the speed pickup of the embodiment of the invention;

Fig. 6 is the cut-open view of the speed pickup of the embodiment of the invention;

Fig. 7 is the overall schematic of the speed pickup and the transmission gear of the embodiment of the invention.

Embodiment

A kind of speed pickup of the present invention; Its structure is shown in Fig. 3～5; Comprise a printed circuit board (PCB) 1, said printed circuit board (PCB) 1 is connected with location plastic cement 2, and the Hall chip 3 and permanent magnet 4 that have been fixed together are installed in the said location plastic cement 2; The fixed form of Hall chip 3 and permanent magnet 4 is fixed together with reference to method of the prior art, and said location plastic cement 2 madial walls are provided with permeability hole 5.When encapsulating, glue will fully get into plastic cement 2 inside, location from the permeability hole about reaching up and down 5.

Because Hall chip 3 and permanent magnet 4 synthetic parts, the drafting angle of permanent magnet 4 is bigger, has therefore increased the fixing design of rib, keeps chip 3 assembling back stress balances.Like Fig. 4 and shown in Figure 5, the left and right sides of the madial wall of said location plastic cement 2 is arranged with four ribs 6, and said rib 6 is avoided said Hall chip 3, with said permanent magnetism 4 iron interference fit.

Like Fig. 3, Fig. 6, shown in Figure 7, said printed circuit board (PCB) 1 adopts inner fixing mode to be connected the location with location plastic cement 2, reduces the product design space, and can improve product assembling reliability.Longitudinal extension has holding body on the plastic cement 2 of said location; Said holding body is provided with the fixture block 31 chimeric with printed circuit board (PCB) 1 near an end of location plastic cement 2; The other end is provided with register pin 32, and said printed circuit board (PCB) 1 is provided with the pilot hole 33 corresponding with said register pin 32; Said holding body horizontal expansion has a cramping body, and said cramping body comprises two clamping limbs that are oppositely arranged 34, and said clamping limb is provided with the accepting groove 35 of accommodating printed circuit board (PCB), engages with said printed circuit board (PCB).The center-aligned of said Hall chip 3 and transmission gear 7 has improved the induction sensitivity of product.

The present invention still has numerous embodiments, and all employing equivalents or equivalent transformation and all technical schemes of forming all drop within protection scope of the present invention.

Claims

1. speed pickup; Comprise a printed circuit board (PCB), said printed circuit board (PCB) is connected with the location plastic cement, and Hall chip and the permanent magnet that has been fixed together is installed in the plastic cement of said location; It is characterized in that: be provided with the permeability hole that is used for encapsulating between the outer wall of said location plastic cement madial wall and said permanent magnet; Said printed circuit board (PCB) adopts inner fixing mode to be connected the location with the location plastic cement, and longitudinal extension has holding body on the plastic cement of said location, and said holding body is provided with the fixture block chimeric with printed circuit board (PCB) near an end of location plastic cement; The other end is provided with register pin, and said printed circuit board (PCB) is provided with the pilot hole corresponding with said register pin; Said holding body horizontal expansion has a cramping body, and said cramping body comprises 2 clamping limbs that are oppositely arranged, and said clamping limb is provided with the accepting groove of accommodating printed circuit board (PCB), engages with said printed circuit board (PCB) through accepting groove.

2. speed pickup according to claim 1 is characterized in that: be arranged with at least 4 ribs on the madial wall of said location plastic cement, said rib and said permanent magnet interference fit.

3. speed pickup according to claim 2 is characterized in that: said rib is arranged on the left and right sides of the madial wall of location plastic cement.

4. speed pickup according to claim 1 is characterized in that: the center-aligned of said Hall chip and transmission gear.