CN217846361U - Speed sensor - Google Patents

Abstract

The utility model provides a speed sensor. The speed sensor includes a sensor main body portion extending in a first direction. The sensor body portion includes a housing, and a chip and a skeleton insert housed within the housing. The chip is fixed on the framework insert and the material of the shell completely wraps the chip and the framework insert. The utility model provides a speedtransmitter has overcome the not enough of existence among the prior art for leakproofness in the whole life cycle of speedtransmitter is better, does not receive the material kind restraint, stable performance, and of high quality is difficult for becoming invalid.

Description

Speed sensor

Technical Field

The utility model belongs to the technical field of vehicle sensor, especially, relate to a be applied to speedtransmitter on vehicle.

Background

The current speed sensor is designed by a skeleton insert cladding molding process. A positioning column is designed on the framework insert and used for positioning on a mold during injection molding. And sealing ribs are designed around the positioning columns and are used for being fused with a shell filling material during injection molding, so that the sealing requirement is met. After injection molding, the end parts of the positioning columns are exposed out of the shell material, and then the excessive positioning column material protruding out of the surface of the shell is removed by manual work or other methods.

In order to meet the sealing requirements in the whole life cycle of the product, the current speed sensor design has to select high-performance engineering plastics so that the shell material and the sealing surface part of the positioning column are tightly combined. And the high-performance engineering plastics are expensive, so that the cost of the formed product is higher. In addition, even the adoption of high-performance engineering plastics cannot completely prevent the problem of sealing failure.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome not enough among the prior art, provide a speedtransmitter for leakproofness in the whole life cycle of speedtransmitter is better, does not receive the material kind restraint, stable performance, and of high quality is difficult for becoming invalid.

In order to achieve the above object, the present invention provides a speed sensor, which includes a sensor main body part, wherein the sensor main body part extends along a first direction, and the sensor main body part includes a casing, and a chip and a skeleton insert accommodated in the casing; the chip is fixed on the framework insert and the material of the shell completely wraps the chip and the framework insert.

Preferably, the framework insert extends along the first direction, and at least one pair of positioning holes are formed in the side walls of the framework insert on two sides of the extending direction.

Preferably, two pairs of positioning holes are formed in the side walls of the framework insert on two sides in the extending direction, and the two pairs of positioning holes are arranged at intervals in the extending direction.

Preferably, the skeleton insert has a wall-reducing gap in a section between the two pairs of positioning holes.

Preferably, a plurality of positioning recesses are formed in the side walls of the housing of the sensor main body part in the extending direction, and the positioning recesses correspond to the positioning holes in the skeleton insert one to one.

Preferably, the shell material at the positioning recess on the shell completely covers the corresponding positioning hole on the skeleton insert, and the positioning recess is formed by: the shell material is gradually filled and covers the whole framework insert in the injection molding process, and a positioning recess which is sunken relative to the outer surface of the shell is formed at the positioning hole.

Preferably, the positioning recess is formed with a ring of flange adjacent to the outer surface of the housing, and the top surface of the flange is arranged to protrude from the outer surface of the housing.

Preferably, the sensor main body part is correspondingly notched at the wall-reducing notch of the skeleton insert, so that the wall thickness of the shell at the notch is consistent with that of the shell at other parts of the sensor main body part.

Preferably, the notch portion of the sensor main body portion further has a rib extending in the first direction, and the rib is provided across the notch.

Preferably, one end of the sensor main body portion is a chip end, the other end of the sensor main body portion is an output end, and the first direction is a direction from the chip end to the output end; the framework insert extends from the chip end to the output end, and the chip is mounted on the framework insert close to the chip end; the skeleton insert is also provided with a conductive element, the conductive element extends from the chip end to the output end, and the chip transmits an electric signal to the output end of the sensor main body part through the conductive element.

Preferably, the speed sensor further comprises a mounting flange, the mounting flange is arranged at a position, close to the output end, of the sensor main body part, and a plurality of weight-reducing cavities are formed in the circumferential end face of the mounting flange.

Compared with the prior art, the utility model discloses a speedtransmitter scheme has carried out great optimization to structural design, has simplified manufacturing process for the speedtransmitter product is behind final injection moulding, and skeleton inserts and chip are whole to be covered by the casing material, do not have with external intercommunication passageway, realize totally enclosed requirement. In addition, due to the structural design of the scheme, even if the filling material with general performance is selected, the sealing effect can be better, and the material standard and the material cost are reduced. The utility model discloses a product manufacturing process has also been simplified in the design, does not need reference column material to get rid of process and manual work, and the cost is showing and is reducing. The utility model discloses a structural design has still effectively reduced the product shaping back, and the whole wall thickness of product is inhomogeneous leads to the problem of shrinkage deformation, has guaranteed product quality, has reduced material and cost simultaneously.

Drawings

Fig. 1 is a perspective view of a speed sensor according to a preferred embodiment of the present invention;

FIG. 2 isbase:Sub>A partial cross-sectional view A-A of FIG. 1;

fig. 3 is a perspective view of the skeleton insert according to the preferred embodiment of the present invention.

Detailed Description

The scheme of the invention is further explained by combining the attached drawings and the preferred embodiment.

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it is to be understood that the invention is not to be limited to the specific embodiments described. Rather, any combination of the following features and elements, whether related to different embodiments or not, is contemplated to implement the present invention. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered elements or limitations of the claims except where explicitly recited in a claim. In addition, in this document, terms indicating directions such as up, down, left, right, upper, lower, and the like are used for convenience of description only and are expressed according to relative positions of components in the current drawings, and should not be construed as limiting the scope of protection.

To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a perspective view of a speed sensor according to a preferred embodiment of the present invention; FIG. 2 isbase:Sub>A partial cross-sectional view A-A of FIG. 1; fig. 3 is a perspective view of the skeleton insert according to the preferred embodiment of the present invention.

As shown in fig. 1, in the present embodiment, the present invention provides a speed sensor 10, particularly, for example, a speed sensor for an engine, including a sensor main body portion 11. The sensor main body 11 extends in a first direction (in fig. 1, in the X direction). One end of the sensor body portion 11 is a chip end 111, the other end is an output end 112, and the first direction is a direction from the chip end 111 to the output end 112.

The speed sensor 10 also includes a mounting flange 12. The mounting flange 12 is disposed on the sensor body 11 near the output end 112. The mounting flange 12 is formed in the circumferential direction of the sensor main body portion 11 by injection molding. The mounting flange 12 is also provided with a plurality of weight-reducing cavities 121 on its peripheral surface. The design of the plurality of weight-reducing cavities 121 not only reduces the weight of the whole sensor and saves materials, but also particularly and advantageously avoids the defects of material shrinkage deformation and the like caused by the overlarge wall thickness of the mounting flange while ensuring the structural strength.

Further, the speed sensor 10 further includes a connector housing 13 connected to the output end 112 of the sensor main body portion 11. The extending direction of the connector housing 13 is set at a certain angle with respect to the first direction X. It is understood that in other embodiments, the extending direction of the connector housing 13 and the first direction X may be the same; in other embodiments, the output end 112 of the sensor main body 11 may be directly led out of the cable without a connector housing.

Further, as shown in fig. 1, 2, and 3, the sensor main body portion 11 includes a case 113, and a chip 20 and a skeleton insert 21 accommodated in the case 113. The chip 20 is fixed on the framework insert 21, and the shell 113 completely wraps the chip 20 and the framework insert 21, so that no part of the chip 20 and the framework insert 21 is exposed out of the shell material, and the sealing requirement of the speed sensor in the whole life cycle is further met.

Further, the skeleton insert 21 extends from the chip end 111 of the sensor main body portion 11 toward the output end 112, i.e., along the first direction X. The side of the skeleton insert 21 close to the chip end 111 is provided with an accommodating cavity 211 for accommodating the chip 20. The skeleton insert 21 is also provided with a conductive element 22. The conductive element 22 may be, for example, a metal pin. The conductive element 22 may be injection molded or assembled onto the skeleton insert 21. The conductive element 22 extends from the chip terminal 111 to the output terminal 112, and the leads of the chip 20 are electrically connected to the conductive element 22 and transmit the electrical signal to the output terminal 112 of the sensor body 11 through the conductive element 22.

Further, the side walls of the skeleton insert 21 at two sides in the extending direction are provided with at least one pair of positioning holes. Preferably, two pairs of positioning holes 212 and 213 are disposed on the sidewalls of the skeleton insert 21, and the two pairs of positioning holes 212 and 213 are spaced apart from each other along the extending direction of the skeleton insert 21. These positioning holes are used to receive positioning pins of the injection mold to insert at the beginning of the mold injection to position the skeleton insert 21 in the mold cavity. Accordingly, after the injection molding is completed, the housing 113 of the sensor main body portion 11 is formed with a plurality of positioning recesses 114 on both side walls in the extending direction X. These positioning recesses 114 correspond one-to-one to the positioning holes of the skeleton insert 21. The housing material at the positioning cavity 114 of the housing 113 completely covers the corresponding positioning holes 212, 213 of the frame insert 21, and the positioning cavity 114 is formed as follows: during the injection molding process, the housing material gradually fills and covers the entire skeleton insert 21, and a positioning recess 114 recessed with respect to the outer surface of the housing 113 is formed at the positioning hole. Because the shell material at the positioning recess is also completely wrapped on the whole framework insert and the corresponding positioning hole, no part of the framework insert is exposed outside the shell material, and the sealing requirement of the speed sensor in the whole life cycle is further met.

Further, as shown in FIG. 2, the positioning pocket 114 forms a ring of flanges 115 adjacent the outer surface of the housing 113. The top surface of the flange 115 is disposed to protrude from the outer surface of the case 113. This location cave and the setting of location cave upper flange be convenient for the mould location ejector pin blocks the location cave lateral wall when the die sinking, and then blocks the sensor main part, is convenient for whole speedtransmitter's drawing of patterns.

Further, the skeleton insert 21 further has a wall-reducing notch 214 formed in a section between the two pairs of positioning holes 212 and 213. The sensor body 11 is correspondingly formed with a notch 116 at the reduced wall notch 214. The existence of the wall-reducing notch 214 enables the wall thickness of the shell of the notch 116 of the sensor main body 11 at the wall-reducing notch 214 to be substantially consistent with the wall thickness of other parts after injection molding, so that the wall thickness of the shell of the whole sensor main body is kept uniform, and the defects of bending, shrinkage deformation and the like of the sensor main body caused by thick local material accumulation of the shell are avoided. Further, in order to reinforce the strength of the sensor main body 11 at the wall-reduced notch 214, a rib 117 extending in the first direction is further formed at the notch 116 of the sensor main body 11, and the rib 117 is provided across the notch 116.

Before injection molding, in a first step, the chip 20, the skeleton insert 21 and the conductive element 22 are assembled or injection molded together to form an assembly, and the leads of the chip 20 are soldered to one end of the conductive element 22. And then, in a second step, placing the components into corresponding mold cavities for positioning. At this time, a plurality of positioning ejector rods of the mold are respectively inserted into a plurality of positioning holes on the framework insert 21, so that the positioning of the components is realized. And thirdly, closing the die and injecting the shell material. In this process, the shell material gradually fills and coats the entire skeleton insert 21, the chip 20, and most of the sections of the conductive elements 22; when the shell material is basically filled in the cavity, the end part of the positioning ejector rod of the die is quickly retracted to a part and is completely withdrawn from the positioning hole on the framework insert 21, so that the shell material is quickly filled in and covers all the positioning holes on the framework insert. Since the mold positioning ejector pins do not completely exit the cavity, positioning recesses 114 are formed in the outer wall surface of the housing at the corresponding positioning holes in the sensor body. The locating pocket 114 receives the end of a mold locating pin that has not yet fully exited the mold cavity. And fourthly, opening the die, completely withdrawing the die positioning ejector rod from the die cavity, and taking out the complete speed sensor. Because the shell material at the positioning recess is also completely wrapped on the whole framework insert and the corresponding positioning hole, no part of the framework insert is exposed outside the shell material, and the sealing requirement of the speed sensor in the whole life cycle is further met.

The utility model discloses a speed sensor, on structural design and injection moulding process, cancelled current skeleton inserts and adopted reference column and mould to carry out the structure of fixing a position, avoided injection moulding back reference column tip to expose outside speed sensor shell surface, caused to use for a long time between casing and the reference column to have sealed not tight sealed failure problem that leads to the fact. The utility model discloses a structural design who forms after location structure and moulding plastics for speedtransmitter's casing material wraps up chip, skeleton inserts completely, accomplishes completely sealed, even select the filling material of general performance for use, also can have better sealed effect. Furthermore, the utility model discloses a product manufacturing process has also been simplified in the design, does not need the reference column material to get rid of process and manual work, and the cost is showing and is reducing. Furthermore, the utility model discloses a structural design has still effectively reduced the product shaping back, and the whole wall thickness of product is inhomogeneous leads to the problem of shrinkage deformation, has guaranteed product quality promptly, has reduced material and cost again.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited thereto. Various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is to be determined by the appended claims.

Claims (11)

1. A speed sensor comprises a sensor main body part, wherein the sensor main body part extends along a first direction, and is characterized in that the sensor main body part comprises a shell, a chip and a framework insert, wherein the chip and the framework insert are accommodated in the shell; the chip is fixed on the framework insert and the material of the shell completely wraps the chip and the framework insert.

2. The speed sensor of claim 1, wherein the skeleton insert extends in the first direction, and the skeleton insert defines at least one pair of positioning holes on sidewalls of the skeleton insert on opposite sides of the extending direction.

3. A speed sensor according to claim 2, wherein said skeleton insert has two pairs of positioning holes formed in its side walls on opposite sides of the extending direction, said two pairs of positioning holes being spaced apart along said extending direction.

4. A speed sensor according to claim 3, wherein said skeleton insert has wall-reducing notches in the section between said two pairs of locating holes.

5. A speed sensor according to any one of claims 2 to 4, wherein the housing of the sensor main body is formed with a plurality of positioning recesses on both side walls in the extending direction, the positioning recesses and the positioning holes of the skeleton insert being in one-to-one correspondence.

6. The speed sensor of claim 5, wherein the housing material at the positioning pocket on the housing completely covers the corresponding positioning hole on the skeleton insert, and the positioning pocket is formed by: the shell material is gradually filled and covers the whole framework insert in the injection molding process, and a positioning recess which is sunken relative to the outer surface of the shell is formed at the positioning hole.

7. A speed sensor according to claim 5, wherein the locating recess is formed as a ring of flange adjacent the outer surface of the housing, the top surface of the flange being disposed to project from the outer surface of the housing.

8. A speed sensor according to claim 4, wherein the sensor body portion is correspondingly notched at the wall-reducing notch of the skeleton insert, such that the wall thickness of the housing at the notch is consistent with the wall thickness of the housing at other portions of the sensor body portion.

9. A speed sensor according to claim 8, wherein said cutout portion of said sensor body portion is further formed with a rib extending in said first direction, said rib being disposed across said cutout.

10. A speed sensor according to any one of claims 1 to 4 and 6 to 9, wherein one end of said sensor body portion is a chip end and the other end is an output end, and said first direction is a direction from said chip end to said output end; the framework insert extends from the chip end to the output end, and the chip is mounted on the framework insert close to the chip end; the skeleton insert is also provided with a conductive element, the conductive element extends from the chip end to the output end, and the chip transmits an electric signal to the output end of the sensor main body part through the conductive element.

11. A speed sensor according to claim 10, further comprising a mounting flange disposed at a location of said sensor body portion adjacent said output end, said mounting flange having a plurality of weight-reducing cavities in a circumferential end surface thereof.

Images