CN112123803A - Sensor cover and manufacturing method thereof - Google Patents
Sensor cover and manufacturing method thereof Download PDFInfo
- Publication number
- CN112123803A CN112123803A CN202010775523.9A CN202010775523A CN112123803A CN 112123803 A CN112123803 A CN 112123803A CN 202010775523 A CN202010775523 A CN 202010775523A CN 112123803 A CN112123803 A CN 112123803A
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- Prior art keywords
- rubber
- ring
- plastic
- sensor cover
- plastic intermediate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1615—The materials being injected at different moulding stations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a sensor cover, belongs to the technical field of automobile parts, and solves the problem that a rubber dustproof ring of the sensor cover in the prior art falls off during assembly and use and cannot achieve the first dustproof effect. This sensor lid is equipped with the rubber dust ring including the casing that is the opening form on the casing, the dust ring outside has linked firmly the plastics midbody, and the plastics midbody links firmly through moulding plastics and be the integral type with the casing. The sensor cover is bonded with the rubber dustproof ring through bonding and vulcanization of the plastic intermediate, the rubber dustproof ring is bonded with the plastic intermediate, then the plastic intermediate is placed into an injection mold to be subjected to injection molding and encapsulation to form a shell, the connection performance is good after injection molding, the plastic intermediate and the dustproof ring can be bonded in a low-temperature environment, the requirement on glue is reduced, and therefore the sensor cover has the advantages of high connection strength and good product consistency.
Description
Technical Field
The invention belongs to the technical field of automobile parts, and relates to a sensor cover and a manufacturing method thereof, in particular to a sensor cover with high structural strength.
Background
The sensor cover is a safety part on an automobile and is mainly used for sealing a sensing element in an automobile steering system and preventing the sensing element from being polluted and corroded by external dust and oil water. In the existing sensor cover, the upper end seal is designed into a concave inverted buckle shape by a rubber sealing piece and a convex inverted buckle shape by a plastic sensor cover, and the two are buckled together by interference fit. The assembly needs manual work, the production efficiency is low, and is influenced by plastic parts, rubber part flashes and clamping openings, the rubber sealing part is easily pulled off from a sensor by axial friction of a steering shaft in the assembly process or is unscrewed in a high-temperature and low-temperature environment by radial rotating friction in the life cycle, so that external oil, water, dust and the like are invaded and polluted, the steering force is increased, and the sealing performance is gradually lost. The lower end sealing is completed by matching an O-shaped ring assembled on a sensor cover with a steering engine, in the design scheme, the rubber ring groove flash of the plastic sensor cover needs to be controlled within 0.04mm, the clamping opening needs to be controlled within 0.02mm, and the rubber ring avoids the flash scratching of a hard rubber piece as much as possible in the assembling direction, but the sealing potential safety hazard is large and the defects exist because the flash scratching cannot be avoided by 100% in the actual production. The lower end sealing is realized by coating liquid glue on the bottom plane of the shell by a customer and fastening the shell assembly and the assembly surface of the steering engine through three bolts.
In view of the above-mentioned drawbacks in the prior art, the present applicant has made an improvement in a sensor cover and has filed a chinese patent (publication No. CN108757940A), which discloses a sensor cover including a plastic housing, a rubber dust ring, a rubber oil seal, and a metal bushing; the upper part of the rubber dustproof ring is provided with a high-elasticity closing-up lip part, the outer side part of the rubber dustproof ring is provided with a circle of outward-protruding transverse bone positions, the outer side part of the rubber dustproof ring is coated with a glue layer, and the plastic shell and the rubber dustproof ring are molded into a whole by injection; the rubber oil seal is internally coated with a metal framework, the inner sealing surface of the rubber oil seal is provided with a plurality of high-elasticity sealing lips, and the outer side of the inner sealing surface of the rubber oil seal is provided with a tightening spring ring; the rubber oil seal is arranged in the plastic shell and tightly presses the lower end of the rubber oil seal through a plastic block; a plurality of metal bushings are embedded on the outer edge of the lower part of the plastic shell; the lower part of the plastic shell is fixedly connected with the sensor shell through solid glue and a metal lining bolt.
Above-mentioned patent is moulded plastics integratively through rubber dirt proof ring and plastic housing, the connection of rubber dirt proof ring and casing has been realized, make the axial tensile strength of rubber dirt proof ring obtain effective promotion, however, the rubber dirt proof ring is fixed on plastic housing via injection moulding process with the rubber dirt proof ring, the casing is when injection moulding, because the rubber dirt proof ring is flexible material, lead to behind the injection moulding, the bonding strength of rubber dirt proof ring and casing can't effectively be guaranteed, the uniformity is poor behind the machine-shaping, and simultaneously, because the bonding strength of plastic housing and rubber dirt proof ring can't effectively be guaranteed, the biggest pulling force that its circumferential direction and axial float bore must receive great influence. In addition, when the plastic shell is processed and molded, uneven filling is easily caused due to insufficient pressure, and the rubber dust ring is easily scratched by flash due to overlarge pressure, so that the requirement on the injection molding process is extremely high.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a sensor cover with high structural strength.
The purpose of the invention can be realized by the following technical scheme: the utility model provides a sensor cover, is including the casing that is the opening form, its characterized in that, casing upper end be equipped with the rubber dirt proof ring, the dirt proof ring outside link firmly the plastics midbody, the plastics midbody link firmly with the casing through moulding plastics and be the integral type.
Utilize plastics midbody and rubber dirt proof ring earlier solidification one-piece, then put into injection mold at injection molding with the rubber dirt proof ring of integral type and plastics midbody, because during injection molding, it is connected with the casing that the plastics midbody is on the die joint, consequently, the stability of being connected of plastics midbody and casing is high, and the rubber dirt proof ring binds through vulcanization process after scribbling the adhesive with the plastics midbody earlier under low temperature environment, consequently, the joint strength of plastics midbody and rubber dirt proof ring is higher, the joint strength of plastics midbody and plastics casing is also higher, make the whole joint strength of rubber dirt proof ring and plastics casing improve greatly.
Compared with the prior art in which rubber materials are directly injection-molded with the shell, rubber is easily extruded and deformed by plastic pressure during injection molding, so that the consistency of products is poor, whether the products are qualified or not can not be checked in the processing process, the product qualification rate is influenced, and the connection strength of the rubber and the shell during injection molding is not high. When this scheme of adoption, the working of plastics can scribble the adhesive and bond together with the rubber dirt ring under the low temperature state, then the rubber dirt ring further strengthens the joint strength with the working of plastics through vulcanizing, directly puts into the injection molding machine after the working of plastics is the integral type with the rubber dirt ring and moulds plastics and form casing and plastics midbody, rubber dirt ring integral type installation.
In the sensor cover, an occlusion structure is arranged between the plastic part and the rubber dustproof ring.
In the above sensor cover, the engaging structure includes an annular boss disposed on the inner side of the plastic part and an annular groove disposed on the outer side of the rubber dust ring and matched with the annular boss. The rubber dustproof ring is effectively prevented from being pulled off by axial friction force during the assembly of the whole vehicle and being pulled off by radial friction force during the working of the steering shaft.
As another scheme, in the above sensor cover, the engagement structure includes an annular groove disposed on the inner side of the plastic part and an annular boss disposed on the outer side of the rubber dust ring and engaged with the annular groove.
In the sensor cover, an embedded structure for preventing the plastic part and the shell from rotating in the circumferential direction is arranged on the outer side of the plastic part, and the embedded structure is grooves circumferentially distributed on the outer side of the plastic intermediate body.
In the sensor cover, the rubber dustproof ring is connected with the plastic part through glue. The rubber dust ring and the plastic part are bonded through common glue to form an integral structure, high-temperature bonding is not needed, and bonding strength cannot be influenced when the glue is cured and subjected to high-temperature injection molding.
Another object of the present invention is to provide a method for manufacturing a sensor cover, comprising the steps of:
s1, injection molding of the plastic intermediate;
s2, carrying out chemical degreasing treatment on the surface of the plastic intermediate, coating a hot vulcanization adhesive on the surface of the plastic intermediate, overlapping the rubber dustproof ring on the surface of the plastic intermediate, and putting the plastic intermediate into a mold for vulcanization;
and S3, placing the vulcanized plastic intermediate and the rubber dustproof ring into an injection mold for injection molding to form a shell, so that the shell is fixedly connected with the plastic intermediate and the rubber dustproof ring to form an integral body after molding.
In the above method for manufacturing a sensor cap, in step S2, the vulcanization temperature is 140 ℃.
In the manufacturing method of the sensor cover, the pressing rings are arranged at the upper end and the lower end of the plastic intermediate body, which are close to one side of the rubber dustproof ring, when the plastic intermediate body and the rubber dustproof ring are placed into a vulcanization mold for vulcanization, the vulcanization mold is utilized to press the pressing rings to enable the pressing rings to deform and then to be pressed on the surface of the rubber dustproof ring, so that the connection strength of the plastic intermediate body and the rubber dustproof ring is enhanced. Set up the clamping ring on the one hand and can make vulcanization mould cover the outside at the rubber dust ring after it collapses to improve axial direction's joint strength.
In the above method for manufacturing a sensor cover, the step S2 further includes a second vulcanization step. The rubber dustproof ring adopts HNBR rubber, and the HNBR rubber can reach the best performance after two-stage vulcanization.
In the above method for manufacturing a sensor cover, in step S2, the rubber dust ring is made of HNBR material.
In the above method for manufacturing a sensor cover, in step S2, the housing is made of PA66+ GF30 material.
Compared with the prior art, the sensor cover has the advantages that the rubber dustproof ring is bonded with the plastic intermediate through bonding and vulcanization of the plastic intermediate and the rubber dustproof ring, then the plastic intermediate is placed into an injection mold to be subjected to injection molding and encapsulation to form the shell, so that the connection between the shell and the rubber dustproof ring is realized through the plastic intermediate, the rubber dustproof ring is prevented from being directly connected with the shell, the shell and the plastic intermediate are plastic products, the connection performance of the shell after injection molding is good, the plastic intermediate and the dustproof ring can be bonded in a low-temperature environment, and the requirement on glue is reduced; an embedded structure for preventing the plastic intermediate body and the shell from rotating in the circumferential direction is arranged between the plastic intermediate body and the shell, so that the circumferential rotation direction between the plastic intermediate body and the shell is limited; the plastic intermediate and the rubber dustproof ring are arranged in the mold, and the clamping ring on the plastic intermediate is pressed on the outer side of the rubber dustproof ring through the mold when the plastic intermediate and the rubber dustproof ring are placed in the mold for vulcanization, so that the connection strength is further increased.
Drawings
FIG. 1 is a schematic cross-sectional structural view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a schematic illustration of an explosive structure of the present invention;
FIG. 4 is a view showing an initial state of the plastic intermediate of the present invention;
FIG. 5 is a schematic structural view of the plastic intermediate and the rubber dust-proof ring of the present invention after completion of vulcanization.
In the figure, 1, a housing; 2. a rubber dust ring; 3. a plastic intermediate; 11. an annular boss; 31. an annular groove; 32. and a pressing ring.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1-3, the sensor cover comprises a shell 1 with an opening, a rubber dustproof ring 2 is arranged at the upper end of the shell 1, a plastic intermediate 3 is fixedly connected to the outer side of the dustproof ring, and the plastic intermediate 3 is fixedly connected with the shell 1 in an integrated manner through injection molding.
The plastic intermediate 3 and the rubber dustproof ring 2 are firstly cured into an integral, then the integral rubber dustproof ring 2 and the integral plastic intermediate 3 are placed into an injection mold for injection molding, and during injection molding, the plastic intermediate 3 is connected with the shell 1 on a parting surface, so that the connection stability of the plastic intermediate 3 and the shell 1 is high, the rubber dustproof ring 2 is firstly bonded with the plastic intermediate 3 in a low-temperature environment, and the requirement on glue for bonding the plastic intermediate 3 and the rubber dustproof ring 2 is greatly reduced.
Compared with the prior art in which a rubber material is directly injection-molded with the shell 1, the rubber is easily extruded and deformed by plastic pressure during injection molding, so that the consistency of products is poor, whether the products are qualified or not can not be checked in the processing process, the product percent of pass is influenced, the connection strength of the rubber and the shell 1 during injection molding is not high, if the rubber is fixedly connected with the glue, the glue is easily misplaced during injection molding, the connection strength is unstable, the requirements on the bonding strength and the high-temperature resistance of the glue are high, the problems of unstable glue connection and high cost are easily caused, in addition, the glue needs to be immediately injection-molded after being coated, and the problem that the coating is uneven due to glue volatilization and glue dripping is prevented. When this scheme of adoption, the working of plastics can be in the same place with rubber dirt ring 2 rubber coating and bonding under the low temperature state, then rubber dirt ring 2 further strengthens the joint strength with the working of plastics through vulcanizing, directly puts into the injection molding machine after the working of plastics is the integral type with rubber dirt ring 2 and moulds plastics and form casing 1 and plastics midbody 3, the installation of 2 integral types of rubber dirt ring.
In order to improve the contact area between the plastic part and the rubber dustproof ring 2, an occlusion structure is arranged between the plastic part and the rubber dustproof ring 2. The occlusion structure comprises an annular boss 11 arranged on the inner side of the plastic part and an annular groove 31 which is arranged on the outer side of the rubber dustproof ring 2 and matched with the annular boss 11. The rubber dustproof ring 2 is effectively prevented from being pulled off by axial friction force during the assembly of the whole vehicle and being pulled off by radial friction force during the working of the steering shaft.
In the sensor cover, the outer side of the plastic part is provided with an embedded structure for preventing the plastic part and the shell 1 from rotating in the circumferential direction, and the embedded structure is a groove which is circumferentially distributed on the outer side of the plastic intermediate body 3. The rubber dustproof ring 2 is connected with the plastic part through glue. The rubber dust ring 2 and the plastic part are bonded through common glue to form an integral structure, high-temperature bonding is not needed, and bonding strength cannot be influenced after glue solidification and during high-temperature injection molding.
The manufacturing method of the sensor cover comprises the following steps:
s1, injection molding of the plastic intermediate 3;
s2, carrying out chemical degreasing treatment on the surface of the plastic intermediate 3, coating a hot vulcanization adhesive on the surface of the plastic intermediate 3, overlapping the rubber dustproof ring 2 on the surface of the plastic intermediate 3, and putting the plastic intermediate 3 into a mold for vulcanization, wherein the vulcanization temperature is 140 ℃;
and S3, placing the vulcanized integrated plastic intermediate 3 and the rubber dustproof ring 2 into an injection mold for injection molding, so that the shell 1 is fixedly connected with the plastic intermediate 3 and the rubber dustproof ring 2 to form an integrated body after molding.
As shown in fig. 4-5, in this embodiment, the pressing rings 32 are disposed on the upper and lower ends of the plastic intermediate 3 near the rubber dust-proof ring 2, and when the plastic intermediate 3 and the rubber dust-proof ring 2 are placed into the vulcanizing mold for vulcanization, the vulcanizing mold is used to press the pressing rings 32 to deform and press the pressing rings onto the surface of the rubber dust-proof ring 2, so as to enhance the connection strength between the two. The pressing ring 32 is arranged, so that the vulcanized mold can cover the outside of the rubber dustproof ring 2 after being collapsed, and the connection strength in the axial direction is improved. The step S2 further includes secondary vulcanization. The rubber dustproof ring 2 is made of HNBR rubber, and the HNBR rubber can reach the best performance after two-stage vulcanization. The shell 1 is made of PA66+ GF30 materials.
The sensor cover enables the rubber dustproof ring 2 to be bonded with the plastic intermediate 3 through bonding and vulcanization of the plastic intermediate 3 and the rubber dustproof ring 2, then the plastic intermediate 3 is placed into an injection mold to be subjected to injection molding and encapsulation to form the shell 1, so that the shell 1 is connected with the rubber dustproof ring 2 through the plastic intermediate 3, the rubber dustproof ring 2 is prevented from being directly connected with the shell 1, the shell 1 and the plastic intermediate 3 are plastic products, the connection performance of the plastic intermediate 3 after injection molding is good, the plastic intermediate 3 and the dustproof ring can be bonded in a low-temperature environment, and the requirement on glue is lowered; an embedded structure for preventing the plastic intermediate 3 and the shell 1 from rotating in the circumferential direction is arranged between the plastic intermediate 3 and the shell 1, so that the circumferential rotation direction between the plastic intermediate 3 and the shell 1 is limited; still be equipped with the interlock structure between plastics midbody 3 and the rubber dirt ring 2, increased area of contact between them, improved joint strength between them, consequently have joint strength height, the good advantage of product uniformity.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a sensor cover, is including the casing that is the opening form, its characterized in that, casing upper end be equipped with the rubber dirt proof ring, the dirt proof ring outside link firmly the plastics midbody, the plastics midbody link firmly with the casing through moulding plastics and be the integral type.
2. The sensor cover of claim 1, wherein a snap-fit structure is provided between the plastic component and the rubber dust ring.
3. The sensor cover of claim 2, wherein the engaging structure comprises an annular boss disposed on the inner side of the plastic part and an annular groove disposed on the outer side of the rubber dust ring and engaged with the annular boss.
4. The sensor cover of claim 2, wherein the snap structure comprises an annular groove disposed on an inner side of the plastic member and an annular projection disposed on an outer side of the rubber dust ring and engaged with the annular groove.
5. A sensor cover according to any one of claims 1 to 4, wherein the outer side of the plastic part is provided with an embedded structure for preventing the plastic part and the housing from rotating circumferentially.
6. A sensor cover according to any one of claims 1 to 4, wherein the rubber dust ring is attached to the plastic member by an adhesive.
7. The sensor cover of claim 6, wherein the rubber dust ring is integrally connected to the plastic part by a vulcanization process after the rubber dust ring and the plastic part are connected by a vulcanization adhesive.
8. A method of manufacturing a sensor cap, comprising the steps of:
s1, injection molding of the plastic intermediate;
and S2, performing chemical degreasing treatment on the surface of the plastic intermediate, coating a hot vulcanization adhesive on the surface of the plastic intermediate, overlapping the rubber dustproof ring on the surface of the plastic intermediate, and putting the plastic intermediate into a mold for vulcanization.
And S3, placing the vulcanized plastic intermediate and the rubber dustproof ring into an injection mold for injection molding to form a shell, and fixedly connecting the shell with the plastic intermediate and the rubber dustproof ring after molding to form an integral body.
9. A method of manufacturing a sensor cap according to claim 8, wherein: the upper end and the lower end of the plastic intermediate are provided with the pressing rings on one side close to the rubber dustproof ring, when the plastic intermediate and the rubber dustproof ring are placed into a vulcanization mold for vulcanization, the vulcanization mold is used for pressing the pressing rings to enable the pressing rings to be deformed and then pressed on the surface of the rubber dustproof ring, so that the connection strength of the plastic intermediate and the rubber dustproof ring is enhanced.
10. A method of manufacturing a sensor cap according to claim 8, wherein: in step S2, post vulcanization is further included.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010775523.9A CN112123803B (en) | 2020-08-05 | 2020-08-05 | Sensor cover and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010775523.9A CN112123803B (en) | 2020-08-05 | 2020-08-05 | Sensor cover and manufacturing method thereof |
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| CN112123803A true CN112123803A (en) | 2020-12-25 |
| CN112123803B CN112123803B (en) | 2023-02-14 |
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| CN204628362U (en) * | 2015-05-18 | 2015-09-09 | 嘉兴市兴嘉汽车零部件制造有限公司 | Magnetic clutch assembly |
| CN204794488U (en) * | 2015-08-13 | 2015-11-18 | 珠海市通得电气设备有限公司 | Plastic envelope motor of outer fan of commercial how online air conditioning |
| US20170057136A1 (en) * | 2015-08-31 | 2017-03-02 | Nakanishi Metal Works Co., Ltd. | Manufacturing method of protective cover having sensor holder part |
| CN108757940A (en) * | 2018-07-13 | 2018-11-06 | 安徽中鼎橡塑制品有限公司 | A kind of sender unit cap |
| CN110587872A (en) * | 2019-10-25 | 2019-12-20 | 江苏赛麟汽车科技有限公司 | Production process of novel shock absorber device |
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| CN112123803B (en) | 2023-02-14 |
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