CN219349901U

CN219349901U - Quick-assembly small-volume angular displacement potentiometer based on injection molding assembly

Info

Publication number: CN219349901U
Application number: CN202320035385.XU
Authority: CN
Inventors: 杜长春; 胡佑朴; 鲍红军; 吴永胜; 唐飞
Original assignee: Chengdu Hongming Electronics Co Ltd
Current assignee: Chengdu Hongming Electronics Co Ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-07-14
Anticipated expiration: 2033-01-06

Abstract

The utility model discloses a quick-assembly small-volume angular displacement potentiometer based on an injection molding assembly, which comprises a shell, a rotating shaft, an insulating sleeve, a collecting ring, an electric brush, a resistor body and a cover plate, wherein the insulating sleeve, the rotating shaft and the collecting ring are processed together in an injection molding mode to form the injection molding assembly, an annular groove is formed in the rotating shaft at a position corresponding to the insulating sleeve, a part, close to a central through hole, of the insulating sleeve is embedded into the annular groove, a collecting ring convex ring protruding towards the central through hole of the collecting ring is arranged on the hole wall of the central through hole, and the collecting ring convex ring is embedded into the outer wall of the insulating sleeve. According to the utility model, the insulating sleeve, the rotating shaft and the collecting ring are processed together to form the injection molding assembly, and the insulating sleeve, the rotating shaft and the collecting ring are assembled in an adhesive mode during assembly, so that the adhesive link is reduced, the assembly efficiency is greatly improved, the connection reliability among the insulating sleeve, the rotating shaft and the collecting ring can be ensured, and the volume is reduced due to the structure that the three parts are in adhesive connection.

Description

Quick-assembly small-volume angular displacement potentiometer based on injection molding assembly

Technical Field

The utility model relates to an angular displacement potentiometer (sensor), in particular to a quick-assembly small-volume angular displacement potentiometer based on an injection molding assembly, and belongs to the technical field of production of angular displacement potentiometers.

Background

With miniaturization and informatization of products, an electric servo mechanism occupies a main position in more and more servo control systems, and an angular displacement potentiometer (sensor) for position feedback, which is matched with the electric servo mechanism, is also widely used, wherein the angular displacement potentiometer using a conductive plastic resistor body is particularly widely applied.

As shown in fig. 1, the basic structure of the conventional angular displacement potentiometer comprises a potentiometer shell 2, a potentiometer rotating shaft 1, a potentiometer sleeve 5, a potentiometer collecting ring 7, a potentiometer electric brush 6, a potentiometer resistor 4 and a potentiometer cover plate 8, wherein the potentiometer rotating shaft 1 passes through corresponding through holes on the potentiometer shell 2 and is connected with the potentiometer shell 2 through a bearing 3, the potentiometer resistor 4 is generally a conductive plastic resistor and is installed in the potentiometer shell 2, the insulated potentiometer sleeve 5 is sleeved on the potentiometer rotating shaft 1, the potentiometer collecting ring 7 is sleeved on the potentiometer sleeve 5, the potentiometer electric brush 6 is installed on the potentiometer collecting ring 7 and is in contact with a resistor belt of the potentiometer resistor 4, and the inner end of a lead wire is connected with the potentiometer resistor 4. When the potentiometer rotating shaft 1 is used, the electric brush is driven to contact and slide on the resistor belt of the potentiometer resistor body 4 to generate a changed electric signal, and the electric signal has a corresponding relation with the rotating angle of the potentiometer rotating shaft 1, so that the function of detecting the angular displacement or the function of controlling the output electric signal through the change of the angular displacement is realized.

With the rapid increase of the application demands of various devices and the development of miniaturization of the devices, higher requirements are put forward on the assembly efficiency and miniaturization of the angular displacement potentiometer, and the conventional angular displacement potentiometer has the following defects: the potentiometer sleeve 5 and the potentiometer rotating shaft 1 and the potentiometer collecting ring 7 and the potentiometer sleeve 5 are connected in an adhesive mode, and the assembly mode needs longer adhesive spraying, bonding and curing processes, so that the assembly time can be obviously prolonged, and the assembly efficiency can be reduced; meanwhile, as the parts are independent, the occupied volume is relatively large after assembly, so that the volume of the whole potentiometer is increased, and the miniaturization requirement of the angular displacement potentiometer is not met; and the connection reliability among the potentiometer rotating shaft 1, the potentiometer sleeve 5 and the potentiometer collecting ring 7 is not guaranteed enough. In addition, the potentiometer rotating shaft 1 and the potentiometer housing 2 of the conventional angular displacement potentiometer are generally connected through the bearing 3, so that the volume of the potentiometer is increased.

Disclosure of Invention

The utility model aims to solve the problems, and provides the quick-assembly small-volume angular displacement potentiometer based on the injection molding assembly, which improves the assembly efficiency and reduces the volume by injecting the rotating shaft, the insulating sleeve and the collecting ring into a whole assembly.

The utility model realizes the above purpose through the following technical scheme:

the utility model provides a small angular displacement potentiometer of fast-assembling formula based on subassembly of moulding plastics, includes casing, pivot, insulating sleeve, collecting ring, brush, resistance body and apron, the pivot passes corresponding through-hole on the casing, the resistance body is installed in the casing, the insulating sleeve suit is in the pivot, the collecting ring suit is in on the insulating sleeve, the brush is installed on the collecting ring and with the resistance area contact of resistance body, the insulating sleeve the pivot with adopt the mode of moulding plastics to process together between the collecting ring and form the subassembly of moulding plastics, in the pivot with the position that the insulating sleeve corresponds is equipped with annular groove, the part that is close to its central through-hole on the insulating sleeve is embedded in the annular groove, be equipped with on the pore wall of the central through-hole on the collecting ring to the bellied collecting ring bulge loop of its central line, the collecting ring bulge loop is embedded in the outer wall of insulating sleeve. The injection molding mode processing refers to metal plastic injection molding processing in the prior art, and the specific method is as follows: in the injection molding process of liquid plastic, a metal piece and the liquid plastic are connected together, the liquid plastic is solidified to form a solid plastic piece, the plastic piece and the metal piece are mutually embedded to form an injection molding assembly, the metal piece in the injection molding assembly is a rotating shaft and a collecting ring, the plastic piece is an insulating sleeve, and an electric brush is generally arranged on the collecting ring in advance through a rivet.

Preferably, in order to facilitate forming a limit connection structure between the rotating shaft and the shell and the cover plate directly, a bearing is omitted to further reduce the volume of the potentiometer, a rotating shaft convex ring protruding towards the peripheral direction and integrally formed is arranged on the outer wall between one end of the rotating shaft, which is close to the shell, and the annular groove, a first rotating shaft annular step is formed at a position between the corresponding ends of the shell and the rotating shaft convex ring, the first rotating shaft annular step penetrates through a corresponding through hole in the shell, a second rotating shaft annular step is formed at a position between the annular groove and the corresponding end of the rotating shaft convex ring, the second rotating shaft annular step is filled by the insulating sleeve, a cover plate center through hole is formed in the cover plate, one end of the rotating shaft, which is close to the cover plate, penetrates through the cover plate center through hole, and an elastic gasket is sleeved at a position between the insulating sleeve and the cover plate. In order to reduce the friction resistance of the rotation of the rotating shaft, lubricating oil is respectively smeared between the rotating shaft and the hole wall of the corresponding through hole of the shell and between the rotating shaft and the hole wall of the through hole in the center of the cover plate.

Preferably, in order to directly utilize the internal structure of the rotating shaft to realize anti-rotation connection with a driving piece of external equipment, the rotating shaft is a hollow shaft, and a plane is arranged on the surface of the hole wall of the central through hole.

Preferably, in order to reduce the occupied space of the potentiometer as much as possible and facilitate the potentiometer to be mounted on other equipment, the housing is a rectangular housing, mounting grooves are respectively formed in the middle parts of two ends of one side surface of the housing, which are close to the cover plates, rivet holes are respectively formed in the bottoms of the mounting grooves, mounting through holes are respectively formed in the positions, which are close to four corners, of the housing, the cover plates are round cover plates, cover plate mounting parts protruding outwards are respectively formed in the two opposite sides of the cover plates, countersunk through holes are formed in the cover plate mounting parts, two cover plate mounting parts are respectively arranged in the two mounting grooves, and two rivets respectively penetrate through the two countersunk through holes and are connected with the two rivet holes.

The utility model has the beneficial effects that:

according to the utility model, the insulating sleeve, the rotating shaft and the collecting ring are processed together in an injection molding mode to form an injection molding assembly, the connection reliability among all the components is obviously improved due to the mutually embedded structure, the insulating sleeve, the rotating shaft and the collecting ring are not required to be assembled in an adhesive mode when the angular displacement potentiometer is assembled, the adhesive link is reduced, the assembly efficiency is greatly improved, the connection reliability among the insulating sleeve, the rotating shaft and the collecting ring can be ensured, and the volume is reduced due to the structure of the adhesive connection of the three components; through designing specific pivot structure, carry out spacing connection with pivot and casing and apron directness, save bearing connection structure, further reduced the potentiometre volume, do benefit to the miniaturized application demand that satisfies the angular displacement potentiometre.

Drawings

FIG. 1 is a schematic diagram of a front cross-sectional structure of a conventional angular displacement potentiometer;

FIG. 2 is a schematic diagram of a front cross-sectional view of a quick-assembly small-volume angular displacement potentiometer based on an injection molding assembly according to the present utility model;

FIG. 3 is a schematic perspective view of a housing of the injection assembly-based fast-assembled small-volume angular displacement potentiometer of the present utility model;

FIG. 4 is a schematic perspective view of a cover plate of a quick-assembly small-volume angular displacement potentiometer based on an injection molding assembly according to the utility model;

FIG. 5 is a schematic perspective view of a shaft of a quick-assembly small-volume angular displacement potentiometer based on an injection molding assembly according to the present utility model;

FIG. 6 is a schematic perspective view of an injection molding assembly and brushes of the injection molding assembly-based fast-assembled small-volume angular displacement potentiometer of the present utility model;

FIG. 7 is a schematic perspective view of the housing, resistor, injection molding assembly and brush of the fast-assembled small-volume angular displacement potentiometer according to the present utility model;

fig. 8 is a schematic diagram of a three-dimensional structure of an assembled fast-assembled small-volume angular displacement potentiometer based on an injection molding assembly.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

as shown in fig. 2-8, the fast-assembling small-volume angular displacement potentiometer based on the injection molding assembly comprises a shell 9, a rotating shaft 10, an insulating sleeve 13, a collecting ring 14, an electric brush 12, a resistor 11 and a cover plate 17, wherein the rotating shaft 10 penetrates through corresponding through holes in the shell 9, the resistor 11 is installed in the shell 9, the insulating sleeve 13 is sleeved on the rotating shaft 10, the collecting ring 14 is sleeved on the insulating sleeve 13, the electric brush 12 is installed on the collecting ring 14 and is in contact with a resistor belt 32 of the resistor 11, the insulating sleeve 13, the rotating shaft 10 and the collecting ring 14 are processed together in an injection molding mode to form the injection molding assembly, an annular groove is formed in a position, corresponding to the insulating sleeve 13, of the rotating shaft 10, a part, close to the central through hole of the insulating sleeve, is embedded in the annular groove 28, a collecting ring convex ring 15 protruding towards the central line of the insulating sleeve is formed in the wall of the central through hole of the collecting ring 14, and the collecting ring convex ring 15 is embedded in the outer wall of the insulating sleeve 13.

As shown in fig. 2-8, the present utility model also discloses a number of more optimal specific structures:

in order to facilitate the formation of a limit connection structure between the rotary shaft 10 and the housing 9 and the cover plate 17 and to omit a bearing for further reduction of the volume of the potentiometer, a rotary shaft convex ring 30 protruding towards the peripheral direction and integrally formed is arranged on the outer wall between one end of the rotary shaft 10 close to the housing 9 and the annular groove 28, a first rotary shaft annular step 31 is formed at a position between the housing 9 and the corresponding end of the rotary shaft convex ring 30 on the rotary shaft 10 and penetrates through a corresponding through hole 22 on the housing 9, a second rotary shaft annular step 29 is formed at a position between the annular groove 28 and the corresponding end of the rotary shaft convex ring 30 on the rotary shaft 10 and is filled with the insulating sleeve 13, a cover plate central through hole 23 is arranged on the cover plate 19, one end of the rotary shaft 10 close to the cover plate 17 penetrates through the cover plate central through hole 23, and an elastic gasket 16 is sleeved at a position between the insulating sleeve 13 and the cover plate 17 on the rotary shaft 10.

In order to achieve an anti-rotation connection directly with the internal structure of the shaft 10 and the driving member (not shown in the figures) of the external device, the shaft 10 is a hollow shaft and the wall surface of the central through hole 27 is provided with a plane 26.

In order to reduce the occupied space of the potentiometer as much as possible and facilitate the potentiometer to be mounted on other devices, the housing 9 is a rectangular housing, mounting grooves 18 are respectively formed in the middle parts of two ends of one side surface of the housing 9, which is close to the cover plate 17, rivet holes (not marked in the drawing) are respectively formed in the bottoms of the mounting grooves 18, mounting through holes (not marked in the drawing) are respectively formed in positions, which are close to four corners, of the housing 9, the cover plate 17 is a circular cover plate, cover plate mounting parts 24 protruding outwards are respectively formed in two opposite sides of the cover plate 17, countersunk through holes 25 are formed in the cover plate mounting parts 24, the two cover plate mounting parts 24 are respectively arranged in the two mounting grooves 18, and two rivets 33 respectively penetrate through the two countersunk through holes 25 and are connected with the two rivet holes.

Fig. 3 also shows a resistor body mounting sink 20 provided on the case 9 for mounting the resistor body 11, a lead sink 21 for connecting the lead, and a lead through groove 19 for passing out the lead (not shown in the figure), the lead sink 21 being provided at the bottom of the resistor body mounting sink 20 coaxially, a corresponding through hole 22 provided on the case 9 being provided at the bottom of the lead sink 21 coaxially, the lead through groove 19 being provided at the wall of the resistor body mounting sink 20, which is a conventional adaptive structure.

As shown in fig. 2-8, during assembly, only the resistor 11 with the lead wire is required to be mounted in the resistor mounting countersink 20 on the housing 9 and fixed by gluing, one end of the rotating shaft 10 in the injection molding assembly passes through the central through hole of the resistor 11 and the corresponding through hole 22 on the housing 9, the other end passes through the central through hole of the elastic washer 16 and the central through hole 23 of the cover plate, and the cover plate 17 and the housing 9 are connected by two rivets 33, so that the whole angular displacement potentiometer is assembled, and the assembly efficiency is remarkably improved.

When the device is used, the angular displacement potentiometer is arranged on other equipment through the installation through hole on the shell 9, a driving piece of the equipment to be detected passes through the central through hole 27 of the rotating shaft 10, and anti-rotation connection between the driving piece and the plane 26 on the rotating shaft is realized by utilizing the corresponding plane on the driving piece; the driving piece drives the rotating shaft 10 to rotate, the rotating shaft 10 drives the whole injection molding assembly to rotate, the electric brush 12 slides on the resistor belt 32 of the resistor body 11 in a contact manner, and the changed electric signals are collected and transmitted to an external processor to realize the function of detecting the angular displacement.

Description: the shaft 10, the housing 9, the resistor 11, the insulating sleeve 13, the collector ring 14, the electric brush 12 and the cover 17 in the above description correspond to the potentiometer shaft 1, the potentiometer housing 2, the potentiometer resistor 4, the potentiometer sleeve 5, the potentiometer collector ring 7 and the potentiometer cover 8 in the background art, but because the structure of the potentiometer collector ring is adaptively changed, different names and reference numerals are adopted.

The above embodiments are only preferred embodiments of the present utility model, and are not limiting to the technical solutions of the present utility model, and any technical solution that can be implemented on the basis of the above embodiments without inventive effort should be considered as falling within the scope of protection of the patent claims of the present utility model.

Claims

1. The utility model provides a small angular displacement potentiometer of fast-assembling formula based on subassembly of moulding plastics, includes casing, pivot, insulating sleeve, collecting ring, brush, resistance body and apron, the pivot passes corresponding through-hole on the casing, the resistance body is installed in the casing, the insulating sleeve suit is in the pivot, the collecting ring suit is in on the insulating sleeve, the brush is installed on the collecting ring and with the resistance area contact of resistance body, its characterized in that: the insulating sleeve, the rotating shaft and the collecting ring are processed together in an injection molding mode to form an injection molding assembly, an annular groove is formed in the position, corresponding to the insulating sleeve, of the rotating shaft, a part, close to the central through hole, of the insulating sleeve is embedded into the annular groove, a collecting ring convex ring protruding towards the central through hole is arranged on the hole wall of the central through hole of the collecting ring, and the collecting ring convex ring is embedded into the outer wall of the insulating sleeve.

2. The injection assembly-based fast-assembling small-volume angular displacement potentiometer according to claim 1, wherein: the rotary shaft is provided with a rotary shaft convex ring which is convex towards the peripheral direction and is integrally formed on the outer wall between one end of the rotary shaft, which is close to the shell, and the annular groove, a first rotary shaft annular step is formed at the position between the corresponding ends of the rotary shaft convex ring and the shell, the first rotary shaft annular step penetrates through the corresponding through hole on the shell, a second rotary shaft annular step is formed at the position between the annular groove and the corresponding end of the rotary shaft convex ring, the second rotary shaft annular step is filled by the insulating sleeve, a cover plate center through hole is formed on the cover plate, one end, which is close to the cover plate, of the rotary shaft, penetrates through the cover plate center through hole, and an elastic gasket is sleeved at the position between the insulating sleeve and the cover plate in the rotary shaft.

3. The injection molding assembly-based fast-assembling small-volume angular displacement potentiometer according to claim 1 or 2, wherein: the rotating shaft is a hollow shaft, and a plane is arranged on the surface of the hole wall of the central through hole.

4. The injection molding assembly-based fast-assembling small-volume angular displacement potentiometer according to claim 1 or 2, wherein: the casing is the rectangle casing, be close to on the casing the both ends middle part of one side surface of apron is equipped with mounting groove respectively, mounting groove's tank bottom is equipped with the rivet hole, be equipped with the installation through-hole respectively on the casing near the position of four corners, the apron is circular apron and its opposite both sides are equipped with outside bellied apron installation department respectively, be equipped with the countersunk head through-hole on the apron installation department, two the apron installation department is arranged in two respectively in the mounting groove, two rivets pass respectively behind the countersunk head through-hole with two the rivet hole is connected.