DE112020000163T5 - A structure, an injection mold and a molding method for integral molding for rotary transformers - Google Patents

Abstract

The present invention relates to the technical field of rotary transformers, and more particularly to a structure, an injection mold and a molding method for integral molding for rotary transformers. In the present invention, the stator frame assembly and the housing of the rotary transformer are integrally molded by injection molding high strength engineering plastics. On the one hand, it reduces wiring harnesses and connectors and forms the two directly in the main body of the rotary transformer, reducing the number and steps of assembly parts of the entire machine, reducing the cumulative dimensional tolerances that occur during assembly, and thus increasing product accuracy and the overall strength of the Rotary transformer is reinforced. On the other hand, by reducing the number and steps of the assembly parts of the rotary transformer, the product structure becomes more compact, the process becomes simpler and the costs are reduced. In addition, in the present invention, the housing is divided into a cover and a mounting body, then these two are integrally molded by injection molding using an injection mold for rotary transformers, thereby solving the difficulty of demolding.

Description

Field of invention

The present invention relates to the technical field of rotary transformers, and more particularly to a structure, an injection mold and a molding method for integral molding for rotary transformers.

State of the art

Rotary transformers are now widely used in various industries and particularly in the automotive industry for new energy cars. The rotary transformer has strong anti-interference ability, long service life and high adaptability in harsh environments. As such, it has essentially replaced other types of sensors and is used in engine systems.

The mounting position of the rotary transformer in the motor system is usually at the head and tail ends of the motor shaft, and it is equipped with a protective structure.

It will be on 1 Referenced. The conventional rotary transformer 1 'comprises a stator frame arrangement 11' and a rotor 12 ', the rotor 12' being attached to a motor shaft 2 ', the stator frame arrangement 11' being fixed in the housing 13 'and the housing 13' fixed to the outer housing by means of latching parts 14 ' of the motor is connected. The motor controller controls the rotation of the motor to drive the rotor 12 'of the rotary transformer 1'. The stator of the rotary transformer 1 'outputs an angular velocity signal in order to identify the position, speed, etc. of the motor shaft 2' and thus assist the motor control with regard to the control of the speed, starts and stops, etc. of the motor.

The rotary transformer 1 'is one of the high-precision components. As a rule, the radial gap between the stator and rotor is between 0.3 and 0.8 mm. In order to ensure the accuracy of the output signal of the rotary transformer 1 ', the concentricity error between the stator and the rotor must not exceed 0.2 mm during assembly, which means that the requirements for the machining accuracy of the various parts of the motor are very high and the tolerance of fit is very small in all components. In this way, normal operation of the rotary transformer 1 'can be ensured.

As for the mounting mechanism, the conventional rotary transformer 1 'for motors has a large number of parts and requires a complicated process. More importantly, cumulative dimensional tolerances occur during the assembly process of the rotary transformer 1 '.

Usually the housing, cylinder parts, rotary transformer 1 'and connector parts are provided by different suppliers and then assembled by the motor manufacturer. In the prior art, the stator frame assembly 11 'and the housing 13' are constructed separately and then assembled into a compact rotary transformer 1 ', then the rotary transformer 1' is attached to the motor housing, which results in cumulative dimensional tolerances and thus in low concentricity and large dimensional deviations. In addition, the problems of insufficient overall strength and poor stability after assembly persist.

Object of the invention

It is an object of the invention to solve the above-mentioned problems of low concentricity, large dimensional deviations and insufficient overall strength of the rotary transformer and to provide a structure, an injection mold and a molding method for one-piece molding for rotary transformers.

• Separates Spritzgießen und Formen der Statorrahmenanordnung und der Abdeckung, wobei in der Abdeckung eine zur Unterbringung der Statorrahmenanordnung dienende Montagekammer gebildet ist.

To achieve the above-mentioned object, in one aspect of the present invention a method for one-piece molding for rotary transformers is provided, comprising the following steps:

• Separate injection molding and molding of the stator frame assembly and the cover, an assembly chamber serving to accommodate the stator frame assembly being formed in the cover.

Providing an injection mold for rotary transformers, wherein a positioning gap and a stop plate are arranged in the mold cavity of the injection mold for rotary transformers.

Engaging the stator frame assembly and the positioning gap, thereby providing a close fit between the positioning gap and the inner peripheral surface of the stator frame assembly and a tight fit between the end surface of the stop plate and the first end surface of the stator frame assembly.

Enveloping the stator frame assembly by the cover, wherein there is a close fit between the end surface of the cover and the second end surface of the stator frame assembly, wherein the sealing brought about by the coordination of the cover and the stop plate can prevent the melt from penetrating into the assembly chamber.

Injection molding of the stator frame assembly and the cover to form a one-piece structure, the assembly body being simultaneously molded in one piece by injection molding and being formed as a housing together with the cover.

According to one embodiment of the present invention, during injection molding, the assembly body is molded in one piece together with the latching parts and the assembly holes of the latching parts for one-piece molding.

According to an exemplary embodiment of the present invention, during injection molding, the connector is injection molded for integral molding in the assembly body.

In another aspect of the present invention, a structure for one-piece molding for rotary transformers is provided, which is produced by the above-described method for one-piece molding for rotary transformers and comprises a stator frame assembly and a housing, wherein the stator frame assembly and the housing are integrally molded by injection molding.

According to an embodiment of the present invention, the one-piece molding structure for rotary transformers further comprises a connector, wherein the connector and the housing are integrally molded by injection molding.

According to an embodiment of the present invention, the first end of the connector is configured as a winding connection end and the second end of the connector is configured as a plug connection end, the winding connection end being directly electrically connected to the coil winding of the stator frame assembly.

According to one embodiment of the present invention, the first end of the connector is configured as a winding connection end and the second end of the connector is configured as a plug connection end, a connection part being arranged on the stator frame assembly and being integrally molded therewith by injection molding, one end of the connection part being electrically connected to the coil winding of the Stator frame assembly connected and the other end of the connecting part is welded to the winding connection end.

According to an embodiment of the present invention, the one-piece molding structure for rotary transformers further comprises latching parts, each latching part being provided with a mounting hole, the latching parts and the mounting holes in the mounting body being molded in one piece.

• eine Positionierungsspalte, die zum Positionieren der Statorrahmenanordnung dient;
• eine Stoppplatte, die zum Abdichten der Montagekammer der Abdeckung auf die Abdeckung abgestimmt ist;

In a further aspect of the present invention, an injection mold for rotary transformers is provided which is used for the one-piece injection molding of the stator frame assembly and the housing, the housing comprising a cover, the stator frame assembly being housed in the assembly chamber of the cover during the injection molding, the injection mold for A rotary transformer comprises a mold cavity, the following being disposed in the mold cavity:

• a positioning column used for positioning the stator frame assembly;
• a stop plate that is matched to the cover to seal the mounting chamber of the cover;

According to an embodiment of the present invention, cores are further arranged in the mold cavity for the one-piece molding of the mounting holes.

According to one embodiment of the present invention, the injection mold for rotary transformers comprises a movable mold and a fixed mold, the movable mold and the fixed mold are matched to one another so that they together form a mold cavity, the mold cavity for the one-piece injection molding of the stator frame assembly and the housing serves.

According to one embodiment of the present invention, the movable molding tool comprises two opposing core pulling slides, the two core pulling slides having coordinated, stepped structures so that the two can be inserted into one another, the two core pulling slides for forming the lower section of the assembly body or the connecting section of the Serve assembly body.

According to one embodiment of the present invention, the movable mold comprises two opposing core pulling slides of the lower section of the assembly body and one core pulling slide of the connecting section of the assembly body, the two opposing core pulling slides of the lower section of the assembly body serving to shape the lower section of the assembly body and the core pulling slide of the connecting section of Mounting body is used to form the connecting portion of the mounting body.

1. 1) In der vorliegenden Erfindung werden die Statorrahmenanordnung und das Gehäuse durch Spritzgießen einteilig geformt. Zum einen wird die Anzahl der Montageteile des Rotationstransformators verringert. Beispielsweise können die zum Positionieren der Statorrahmenanordnung dienenden Vorsprünge weggelassen werden, wodurch die Struktur des Rotationstransformators kompakter wird, die Gesamtfestigkeit höher wird, das Verfahren einfacher wird und die Kosten sinken. Zum anderen werden die Montageschritte und die bei der Montage auftretenden kumulativen Maßtoleranzen reduziert und wird die Produktgenauigkeit erhöht;
2. 2) In der vorliegenden Erfindung sind die Statorrahmenanordnung, das Gehäuse, die Rastteile, die Montagelöcher und der Verbinder durch Spritzgießen einteilig geformt, wodurch die Anzahl der Schritte reduziert und die Montageteile der gesamten Maschine verringert werden, die bei der Montage auftretenden kumulativen Maßtoleranzen reduziert werden, die Produktgenauigkeit erhöht wird und gleichzeitig die Gesamtfestigkeit, die Genauigkeit und Stabilität des Rotationstransformators erhöht werden;
3. 3) In der vorliegenden Erfindung wird das Gehäuse in eine Abdeckung und einen Montagekörper unterteilt, anschließend werden diese beiden durch Spritzgießen mittels einer Spritzgussform für Rotationstransformatoren einteilig geformt, wodurch die Schwierigkeit der Entformung gelöst wird.

With the technical solutions described above, the structure, the injection mold and the molding method for integral molding for rotary transformers have the following advantageous effects:

1. 1) In the present invention, the stator frame assembly and the housing are integrally molded by injection molding. On the one hand, the number of mounting parts of the rotary transformer is reduced. For example, the projections used to position the stator frame assembly can be omitted, thereby making the structure of the rotary transformer more compact, increasing the overall strength, simplifying the process and reducing costs. On the other hand, the assembly steps and the cumulative dimensional tolerances occurring during assembly are reduced and the product accuracy is increased;
2. 2) In the present invention, the stator frame assembly, the housing, the latching parts, the mounting holes and the connector are integrally molded by injection molding, thereby reducing the number of steps and the mounting parts of the whole machine, reducing the cumulative dimensional tolerances involved in the assembly , Product accuracy is increased while the overall strength, accuracy and stability of the rotary transformer are increased;
3. 3) In the present invention, the case is divided into a cover and a mounting body, then these two are integrally molded by injection molding using an injection mold for rotary transformers, thereby solving the problem of demolding.

Figure list

• 1 Fig. 13 is a schematic view of assembling a conventional rotary transformer;
• 2 Fig. 13 is a schematic view of demolding the conventional rotary transformer;
• 3 shows a schematic view of the rotary transformer according to the invention;
• 4th shows a schematic view of the stator frame assembly according to the invention;
• 5 Figure 3 shows a schematic view of the housing according to the present invention;
• 6th Figure 3 shows a schematic view of the connector according to the present invention;
• 7th Figure 3 shows a flow chart of the one-piece molding method for rotary transformers according to the present invention;
• 8th Figure 3 shows a schematic view of the assembly of the cover according to the present invention;
• 9 Figure 3 shows a schematic view of the mold cavity in accordance with the present invention;
• 10 Figure 12 shows a schematic view of the core puller according to the present invention;
• 11 Fig. 10 is a schematic view showing the separated state of the core puller according to the present invention;
• 12th Fig. 13 shows a schematic view of the assembled state of the core puller according to the present invention;
• 13th Fig. 13 is a schematic view of the core puller of the lower portion of the mounting body of the injection mold for rotary transformers according to the present invention;
• 14th Fig. 13 is a schematic view of the core puller of the connecting portion of the mounting body of the injection mold for rotary transformers according to the present invention;
• 15th Fig. 13 is a schematic view showing the mating relationship between the core pulling slide of the lower portion of the mounting body and the core pulling slide of the connecting portion of the mounting body according to the present invention;
• 16 Figure 13 shows a schematic view of the final formed rotary transformer in accordance with the present invention.

Detailed description of the exemplary embodiments

List of reference symbols

1'

Rotary transformer;

11 '

Stator frame assembly;

12 '

Rotor;

13 '

Casing;

14 '

Locking part;

2 '

Motor shaft;

1

Rotary transformer;

11

Stator frame assembly;

111

Main body;

112

Winding section;

113

first end face;

114

second end face;

115

Stator;

13th

Casing;

131

Cover;

132

upper portion of the mounting body;

133

lower section of the mounting body;

134

Connecting portion of the mounting body;

135

Locking part;

1351

Mounting hole;

15th

Interconnects;

3

fixed mold;

31

Mold cavity;

32

Positioning column;

33

Stop plate;

34

Core;

4th

movable mold;

5

Core pull slide;

6th

Core pulling slide of the lower portion of the mounting body;

7th

Core pulling slide of the connecting section of the mounting body

In the following, the technical solution contained in the exemplary embodiments of the present invention will be described in detail and completely with reference to the drawings relating to the exemplary embodiments of the present invention. The exemplary embodiments described represent, of course, only some of the exemplary embodiments of the present invention and not all exemplary embodiments. The following description of at least one exemplary embodiment serves only for illustration and is in no way to be understood as a restriction of the present invention and its applications. All further exemplary embodiments, which the person skilled in the art can arrive at without creative input on the basis of the exemplary embodiments of the present invention, also fall under the scope of protection of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a”, “an” and “der / die / das” are intended to include plural forms as well, unless the context clearly indicates otherwise. It will further be understood that the terms “comprises” and / or “comprising” when used in this specification specify the presence of the noted features, steps, operations, elements, and / or combinations thereof.

Unless expressly stated otherwise, the scope of the present invention is not limited by the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the exemplary embodiments. It should be understood that in order to simplify the description, the sizes of the various components shown in the drawings are not necessarily drawn to scale. The techniques, methods, and devices known to one skilled in the art may not be discussed in detail, but the techniques, methods, and devices should, where appropriate, be considered part of the recognized specification. In all of the exemplary embodiments shown and discussed here, any particular value should be interpreted as exemplary only and not as a limitation. Therefore, examples representing modifications of an embodiment may have other values. It should be noted that like numerals and letters indicate like elements in the following figures. As soon as an element is defined in a figure, it therefore does not have to be explained again separately in the following figures.

In the description of the present invention, it goes without saying that the orientation words such as “front, back, top, bottom, left and right”, “side, vertical, vertical, horizontal” and “top and bottom “Will normally be based on the orientation or positional relationship shown in the figures and are only used to simplify the description of the present invention. Unless otherwise specified, these orientation words do not mean or imply that the device or element referred to must be in a particular orientation, or be constructed and operated in a particular orientation. Therefore, the orientation words should not be construed as limiting the scope of the present invention. The orientation words “inside and outside” are to be understood as meaning the inside or outside with respect to the contour of an element.

To simplify the description, spatial relative expressions such as "below", "below", "lower", "above", "above", "upper" and the like can be used to describe the relationship a device or a feature to other devices or features describe how it is shown in the figures. The spatial relative terms are intended to encompass various orientations of the device in addition to the orientation illustrated in the figures. For example, if the device is flipped over in the figures, the device described as “above” other devices or structures would be “below” the other devices or structures. Therefore, the exemplary term “above” can encompass both an orientation above and below. The device may be oriented in other ways (rotated 90 ° or with other orientations) and the relative spatial descriptors used herein similarly interpreted accordingly.

In addition, it should be noted that the use of terms such as “first” and “second” to define parts is only intended to make it easier to distinguish between the corresponding components. Unless otherwise indicated, the above words have no particular meaning and are therefore not to be construed as limiting the scope of the present invention.

3 shows a schematic view of the rotary transformer according to the invention. The one-piece molding structure for rotary transformers mainly provides a one-piece molded structure of the stator frame assembly 11 and the housing 13th of the rotary transformer 1 represents, the stator frame assembly 11 and the case 13th are molded in one piece by injection molding. Preferably the stator frame assemblies are 11 and the case 13th molded in one piece by injection molding of high-strength engineering plastics. On the one hand, this reduces wiring harnesses and connecting parts and the two directly in the main body of the rotary transformer 1 shaped, thereby reducing the number and steps of assembly parts of the entire machine, reducing the cumulative dimensional tolerances involved in assembly, thereby increasing the product accuracy and the overall strength of the rotary transformer 1 is reinforced. Second, by reducing the number and steps of mounting parts of the rotary transformer 1 such as B. those for positioning the stator frame assembly 11 serving protrusions, the product structure is more compact, the process is simpler and the cost is reduced. Overall, the rotary transformer can 1 have a more compact structure, higher strength and higher accuracy by the one-piece molding structure for rotary transformers.

It will be on 4th Reference which shows an embodiment of the present invention. In the present exemplary embodiment, the stator frame arrangement comprises 11 a main body 111 , a winding section 112 and a stator 115 , the winding section 112 neatly on the inner circumference of the main body 111 is arranged to form winding slots, the stator 115 on the outer peripheral surface of the main body 111 is attached, the stator frame assembly 11 is molded in one piece by injection molding.

It will be on 3 Referenced. According to an embodiment of the present invention, the rotary transformer comprises 1 also a connector 15th , where the connector 15th and the case 13th are molded in one piece by injection molding.

According to an embodiment of the connection structure of the connector 15th of the present invention is the first end of the connector 15th as the coil connection end and the second end of the connector 15th configured as a connector end, the winding connection end being directly electrically connected to the coil winding of the stator frame assembly 11 is connected, ie the winding end of the coil winding is directly on the winding connecting end of the connector 15th wound so that the connection between the coil winding and the connector 15th is simpler and more stable and the manufacturing process is simpler.

According to a further exemplary embodiment of the connection structure of the connector 15th of the present invention is the first end of the connector 15th as the coil connection end and the second end of the connector 15th configured as a connector end, with a connector on the stator frame assembly 11 and is integrally molded therewith by injection molding, one end of the connector being electrically connected to the coil winding of the stator frame assembly 11 is connected, that is, the winding end of the coil winding is wound on the connecting end of the connecting part and the other end of the connecting part is with the winding connecting end of the connector 15th welded. The welding process includes, but is not limited to, ultrasonic welding, tin welding, and resistance welding.

It will be on the 10 , 11 , 15th and 16 Referenced. The connector according to the invention 15th is preferably a PIN connector. Its connector end can as long as the electrical connection between the rotary transformer 1 and the motor control can be realized linear or L-shaped. Thus, it is not particularly limited.

It will be on the 5 and 6th Referenced. According to an embodiment of the In the present invention, the one-piece molding structure for rotary transformers further includes latching parts 135 , with a respective locking part 135 with a mounting hole 1351 is provided, the locking parts 135 who have favourited mounting holes 1351 and the case 13th are molded in one piece by injection molding.

In another aspect of the present invention, there is further provided a one-piece molding method for rotary transformers which is used to manufacture the above-mentioned one-piece molding structure for rotary transformers.

It is known that, in that the stator frame assembly 11 and the case 13th are integrally molded by injection molding, the accuracy, strength and stability of the product can be increased. In order to achieve the above-mentioned object, a person skilled in the art has great interest in the stator frame assembly 11 and the case 13th molded into a unit by injection molding, however, the molding process is difficult to implement. It will be on 2 Referenced. When the stator frame assembly 11 and the case 13th are directly molded in one piece by injection molding, the demolding directions of the stator frame assembly run 11 and the housing 13th along both the left and right directions of the motor shaft, causing mutual interference and hence failure of demolding.

It will be on the 3 and 8th Referenced. In the present invention, the stator frame assembly 11 and the cover 131 molded separately by injection molding, with the cover 131 as part of the housing 13th acts and then the other parts of the case 13th molded by injection molding, eventually the stator frame assembly 11 and the case 13th molded in one piece by injection molding. In this way, the problem of the demolding failure in the prior art can be effectively solved. As when molding the cover 131 the mounting chamber and thus the inner surface of the housing 13th are already formed, in the case of injection molding, only the injection molding of the outer surface of the housing needs to be carried out for one-piece molding 13th must be taken into account so that no disruptions occur between the two directions of demolding during demolding.

• S1: Separates Spritzgießen und Formen der Statorrahmenanordnung 11 und der Abdeckung 131;

It will be on 7th Referenced. In the present exemplary embodiment, the method for one-piece molding for rotary transformers comprises the following steps:

• S1: Separate injection molding and molding of the stator frame assembly 11 and the cover 131 ;

It will be on 8th Referenced. After the cover is injection molded 131 an assembly chamber is formed, the stator frame assembly 11 can be accommodated in the assembly chamber and there is a close fit between this and the inner surface of the assembly chamber.

S2: Providing an injection mold for rotary transformers, with a positioning gap 32 and a stop plate 33 in the mold cavity 31 the injection mold for rotary transformers are arranged.

It will be on the 4th and 9 Referenced. In the present embodiment, the shape of the outer peripheral surface is the positioning gap 32 to that of the inner peripheral surface of the winding portion 112 matched so that there can be a close fit between the two. In the present embodiment, the inner circumferential surface of the winding portion 112 as the inner peripheral surface of the stator frame assembly 11 viewed and the positioning column 32 can be used for positioning. Between the end face of the stop plate 33 and the first end face 113 the stator frame assembly 11 there is a tight fit to prevent melt from entering the assembly chamber and thereby the molded structure of the stator frame assembly 11 and the assembly chamber is damaged.

S3: Engaging the stator frame assembly 11 and the positioning column 32 , creating a tight fit between the positioning gaps 32 and the inner peripheral surface of the stator frame assembly 11 and a tight fit between the stop plate 33 and the first end face 113 the stator frame assembly 11 consists.

It will be on the 4th and 9 Referenced. After the stator frame assembly 11 with the positioning column 32 has been engaged, there is a close fit between the inner peripheral surface of the stator frame assembly 11 and the outer peripheral surface of the positioning gap 32 to the positioning of the stator frame assembly 11 to realize, taking the center line of the positioning column 32 can be used as the center line of the motor shaft. After engaging the stator frame assembly 11 is the relative position between the stator frame assembly 11 and the motor shaft set, thereby determining the relative position between the stator 115 the stator frame assembly 11 and the rotor mounted on the motor shaft is fixed. At the same time, there is the end of the stop plate 33 at the first end face 113 the stator frame assembly 11 on. In particular, the end of the stop plate lies 33 on the upper end face of the stator 115 on. In the present embodiment, the upper end surface of the stator 115 as the first end face 113 the stator frame assembly 11 so that the upper portion of the stator frame assembly 11 through the stop plate 33 is sealed to prevent melt from entering the top portion of the stator frame assembly 11 penetrates into the assembly chamber.

S4: Enveloping the stator frame assembly 11 through the cover 131 , with a tight fit between the inner peripheral surface of the cover 131 and the outer peripheral surface of the stator frame assembly 11 consists.

It will be on the 4th , 8th and 9 Referenced. When wrapping, the end face of the cover should be 131 at the second end face 114 the stator frame assembly 11 issue. In particular, the end face of the cover lies 131 on the lower end face of the stator 115 and is engaged with it. In the present embodiment, the lower end face of the stator 115 as the second end face 114 the stator frame assembly 11 be considered. For one, after engagement is the relative position between the cover 131 and the stator frame assembly 11 set and is accordingly the relative position between the cover 131 and the motor shaft are also set. Second, can after the cover 131 at the second end face 114 the stator frame assembly 11 applied, can be achieved that the lower portion of the stator frame assembly 11 is sealed to prevent melt from entering the assembly chamber from the lower portion.

S5: Injection molding of the stator frame assembly 11 and the cover 131 into a one-piece structure, at the same time the mounting body is molded in one piece by injection molding and together with the cover 131 as a housing 13th is trained.

Through the above steps S1 to S5, the stator frame assembly 11 and the case 13th molded in one piece by injection molding.

According to an exemplary embodiment of the present invention, the assembly body is used for one-piece molding together with the latching parts during injection molding 135 and the mounting holes 1351 the locking parts 135 molded in one piece. The locking parts 135 are preferably locking parts made of plastic, so that the relative position between the mounting holes 1351 and the stator frame assembly 11 guaranteed and thus when attaching the rotary transformer 1 the concentricity can be guaranteed on the motor.

In the present embodiment, the housing 13th in a cover 131 and a mounting body divided, wherein injection molding is carried out twice. If the mounting body is molded in one piece by injection molding, the locking parts are 135 and the mounting holes 1351 formed to avoid the mistakes caused by molding the mounting holes twice 1351 caused.

When the case 13th is injection molded as a whole, takes place in the case of the housing 13th provided mounting holes 1351 injection molding twice. By injection molding the mounting holes twice 1351 causes some shrinkage and deviation when repositioning twice, so that the relative position between the mounting holes changes 1351 and the center of the stator frame assembly 11 changes and thus after attaching the housing 13th the concentricity of the stator frame assembly on the motor housing 11 cannot be guaranteed.

According to an embodiment of the present invention, the connector is injection molded 15th Injection molded for one-piece molding in the assembly body.

It will be on the 3 , 8th and 16 Referenced. In the present exemplary embodiment, the assembly body consists of three sections. The first section is an upper section of the mounting body 132 (the section above the dashed line in 16 ) made by one-piece injection molding of the stator frame assembly 11 and the cover 131 is formed. The second section is a lower section of the mounting body 133 (the section below the dashed line in 16 ) of the cover 131 enveloped. The third section is a connecting section of the mounting body 134 that is the connector 15th enveloped, the connector 15th directly in the connection section of the mounting body 134 is injection molded. In particular, the connector 15th before injection molding in the mold cavity 31 fixed (see 10 and 11 ) and then molded in one piece by injection molding. At this point the connector 15th directly in the connection section of the assembly body 134 injection molded. After the one-piece injection molding, the winding process can be carried out to form the windings. After the winding process, the winding end can be wound directly onto the winding connection end of the connector 15th then glue is applied to the joint to reinforce the fixation and protection. This is how a rotary transformer is 1 educated.

• eine Positionierungsspalte 32, die zum Positionieren der Statorrahmenanordnung 11 dient;
• eine Stoppplatte 33, die zum Abdichten der Montagekammer der Abdeckung 131 auf die Abdeckung 131 abgestimmt ist;

It will be on the 3 , 8th and 9 Referenced. In the present embodiment, an injection mold for Rotary transformers are provided which are used for one-piece injection molding of the stator frame assembly 11 and the housing 13th serves, with the housing 13th a cover 131 comprises, wherein during injection molding the stator frame assembly 11 in the assembly chamber of the cover 131 is housed, the injection mold for rotary transformers having a mold cavity 31 comprises, wherein the following in the mold cavity 31 is arranged:

• a positioning column 32 used to position the stator frame assembly 11 serves;
• a stop plate 33 that are used to seal the assembly chamber of the cover 131 on the cover 131 is matched;

When the above structure is used for the above method, the sealing problem of the mounting chamber can be solved to ensure that the mounting chamber is not damaged during the one-piece injection molding.

Further, according to an embodiment of the present invention, the mounting holes are for integrally molding 1351 Cores 34 in the mold cavity 31 arranged.

From the above content it can be seen that the center line of the positioning column 32 as the center line of the motor shaft and the center line of the respective core 34 as the center line of the respective mounting hole 1351 can be used. One skilled in the art should know that the relative position of the center line of each mounting hole 1351 , the centerline of the stator frame assembly 11 and the center line of the motor shaft is the concentricity of the stator 115 and the rotor of the rotary transformer are determined so that the concentricity of the assembled rotary transformer 1 can be guaranteed as long as the center line of the respective mounting hole is during injection molding 1351 and that of the stator frame assembly 11 are each in a standard position. The center line of the respective mounting hole 1351 and that of the stator frame assembly 11 can through the respective core 34 or the positioning column 32 in the mold cavity 31 can be determined, whereby the accuracy of the mold becomes higher, so that the errors caused by the assembly can be reduced.

For example, when wrapping the stator frame assembly occurs 11 through the cover 131 a certain mounting tolerance, but as long as the center line of the respective mounting hole 1351 and that of the stator frame assembly 11 are in the standard position, even if there is a tolerance after assembly, the concentricity of the rotary transformer may be 1 guaranteed. As the stator frame assembly 11 and the case 13th are injection-molded into one unit, the strength and stability are higher, resulting in high concentricity and high stability of the rotary transformer 1 guaranteed.

• Es wird auf die 10 bis 12 Bezug genommen. Gemäß einem Ausführungsbeispiel des erfindungsgemäßen beweglichen Formwerkzeugs umfasst das bewegliche Formwerkzeug 4 zwei einander gegenüberliegende Kernzugschieber 5, wobei die beiden Kernzugschieber 5 aufeinander abgestimmte, abgestufte Strukturen aufweisen, damit die beiden ineinander eingeführt werden können. Die beiden Kernzugschieber 5 dienen zum Formen des unteren Abschnitts des Montagekörpers 133 bzw. des Verbindungsabschnitts des Montagekörpers 134, d. h. eine zum Spritzgießen des unteren Abschnitts des Montagekörpers 133 und des Verbindungsabschnitts des Montagekörpers 134 dienende Formhohlraumfläche ist durch Kombination der beiden Kernzugschieber 5 gebildet.

It will be on the 3 , 9 and 12th Referenced. According to an embodiment of the present invention, the injection mold for rotary transformers comprises a movable mold 4th and a fixed mold 3 , the movable mold 4th and the fixed mold 3 are coordinated so that they together form a mold cavity 31 form, the mold cavity 31 for one-piece injection molding of the stator frame assembly 11 and the housing 13th serves. In particular, there is part of the mold cavity 31 in the fixed mold 3 , with a positioning column 32 and a stop plate 33 in this part of the mold cavity 31 are arranged (see 9 ). The other part of the mold cavity 31 is through the slide of the movable mold 4th educated. Two types of execution are described below:

• It will be on the 10 until 12th Referenced. According to an embodiment of the movable molding tool according to the invention, the movable molding tool comprises 4th two opposing core pulling slides 5 , with the two core pulling slides 5 have coordinated, graduated structures so that the two can be inserted into one another. The two core pulling slides 5 serve to shape the lower portion of the mounting body 133 or the connecting section of the mounting body 134 , ie one for injection molding the lower portion of the mounting body 133 and the connecting portion of the mounting body 134 The mold cavity area is used by combining the two core pulling slides 5 educated.

It should be noted that there is usually a positioning structure on the lower portion of the mounting body 133 and an end opening structure at the mating end of the connector 15th must be provided. The above two structures are formed by two opposing core pulling slides 5 educated.

In the present invention, the positioning structure of the lower portion of the mounting body includes positioning protrusions and positioning grooves, but not limited thereto as long as the positioning function can be achieved. Thus, it is not particularly limited.

It will be on the 13th until 16 Referenced. According to a further exemplary embodiment of the movable molding tool according to the invention, the movable molding tool comprises 4th two opposing core pulling slide of the lower section of the mounting body 6th and a core puller of the connecting portion of the mounting body 7th , the two opposing core pulling slides of the lower section of the assembly body 6th for molding the lower portion of the mounting body 133 serve and the core pull slide of the connecting section of the mounting body 7th for forming the connecting portion of the mounting body 134 is used, ie one for injection molding the lower portion of the mounting body 133 Serving mold cavity area is by combining the two opposing core pulling slides of the lower section of the assembly body 6th formed, wherein the core pulling slide of the connecting portion of the mounting body 7th with one for injection molding the connecting portion of the mounting body 134 serving mold cavity surface is provided.

It should be noted that in the present invention, the sliders (the core pulling slider 5 , the core pulling slide of the lower section of the assembly body 6th and the core pulling slide of the connecting portion of the mounting body 7th ) can be driven by an air cylinder. Of course, the slide can also be moved using inclined guide blocks and coordinated with the movable mold, as long as a core pull can be realized. The structure is not subject to any particular restrictions.

The following describes the injection molding process of the injection mold for rotary transformers: First, the stator frame assembly 11 and the cover 131 Injection molded separately, being in the cover 131 those for housing the stator frame assembly 11 Serving assembly chamber is formed, then the stator frame assembly 11 and the cover 131 molded in one piece by injection molding. In particular, the positioning column 32 first through the stator frame assembly 11 enveloped, creating a tight fit between the positioning gaps 32 and the inner peripheral surface of the stator frame assembly 11 and at the same time a tight fit between the end face of the stop plate 33 and the first end face 113 the stator frame assembly 11 exists, then the stator frame assembly 11 through the cover 131 wrapped with a tight fit between the end face of the cover 131 and the second end face 114 the stator frame assembly 11 consists, by which through the vote of the cover 131 and the stop plate 33 effected sealing can be prevented that melt penetrates into the assembly chamber, then the molds are assembled for casting, so that the stator frame assembly 11 and the cover 131 combined into a one-piece structure and at the same time the assembly body, the locking parts 135 and the mounting holes 1351 be molded by injection molding, after the injection molding, a core pull and then a mold separation are carried out, finally the injection molded part is ejected, whereby the injection molding is completed.

When the movable mold 4th the adapting structure for the core pulling slides of the lower section of the mounting body 6th and the core pulling slide of the connecting portion of the mounting body 7th is, it is necessary during core pulling to first pull the core pulling slide of the connecting portion of the mounting body 7th and then the core pulling slide of the lower portion of the mounting body 6th to push. After the core has been pulled, the mold is separated.

From the above content it can be seen that the problem of failure of demolding in the one-piece injection molding of the conventional rotary transformer is solved by the injection mold according to the invention for rotary transformers and by the method according to the invention for one-piece molding for rotary transformers, so that the goal of direct injection molding of the stator frame assembly 11 and the housing 13th to a unity is achieved. For one, the number of mounting parts of the rotary transformer 1 decreased, thereby reducing the structure of the rotary transformer 1 becomes more compact, the overall strength becomes higher, the process becomes simpler, and the costs decrease. On the other hand, the assembly steps and the cumulative dimensional tolerances occurring during assembly are reduced and the product accuracy is increased.

The above description only represents preferred exemplary embodiments of the invention and is not intended to limit the protection claims. All equivalent changes and modifications that may be made by one skilled in the art in accordance with the description and drawings of the invention are included within the scope of the present invention.

Claims (13)

A method for one-piece molding for rotary transformers, characterized in that it comprises the following steps: separate injection molding and molding of the stator frame assembly (11) and the cover (131), with an assembly chamber in the cover (131) serving to accommodate the stator frame assembly (11) is formed; Providing an injection mold for rotary transformers, wherein a positioning gap (32) and a stop plate (33) are arranged in the mold cavity (31) of the injection mold for rotary transformers; Engaging the stator frame assembly (11) and the positioning gap (32), creating a tight fit between the positioning gap (32) and the inner peripheral surface of the stator frame assembly (11) and a tight fit between the end surface of the stop plate (33) and the first end surface (113 ) the stator frame assembly (11) consists; Enveloping the stator frame assembly (11) by the cover (131), with a tight fit between the end surface of the cover (131) and the second end surface (114) of the stator frame assembly (11), whereby by the coordination of the cover (131) and sealing effected on the stop plate (33) can be prevented from penetrating into the assembly chamber; Injection molding of the stator frame arrangement (11) and the cover (131) to form a one-piece structure, the assembly body being simultaneously molded in one piece by injection molding and formed together with the cover (131) as a housing (13). One-piece molding method for rotary transformers according to Claim 1 , characterized in that during injection molding the assembly body is molded in one piece together with the latching parts (135) and the assembly holes (1351) of the latching parts (135) for one-piece molding. One-piece molding method for rotary transformers according to Claim 1 , characterized in that during injection molding, the connector (15) is injection molded for one-piece molding in the assembly body. One-piece molding structure for rotary transformers obtained by the one-piece molding method for rotary transformers Claim 1 is manufactured, characterized in that it comprises a stator frame assembly (11) and a housing (13), wherein the stator frame assembly (11) and the housing (13) are integrally formed by injection molding. Structure for one-piece molding for rotary transformers according to Claim 4 characterized in that the one-piece molding structure for rotary transformers further comprises a connector (15), the connector (15) and the housing (13) being integrally molded by injection molding. Structure for one-piece molding for rotary transformers according to Claim 5 , characterized in that the first end of the connector (15) is configured as a winding connection end and the second end of the connector (15) is configured as a plug connection end, the winding connection end being directly electrically connected to the coil winding of the stator frame assembly (11). Structure for one-piece molding for rotary transformers according to Claim 5 , characterized in that the first end of the connector (15) is configured as a winding connection end and the second end of the connector (15) is configured as a plug connection end, a connecting part being arranged on the stator frame assembly (11) and being integrally molded therewith by injection molding, wherein a End of the connection part is electrically connected to the coil winding of the stator frame assembly (11) and the other end of the connection part is welded to the winding connection end. Structure for one-piece molding for rotary transformers according to Claim 4 , characterized in that the structure for one-piece molding for rotary transformers further comprises latching parts (135), each latching part (135) being provided with a mounting hole (1351), the latching parts (135) and the mounting holes (1351) being integral with the mounting body are shaped. Injection mold for rotary transformers, characterized in that an injection mold for rotary transformers is provided, which is used for the one-piece injection molding of the stator frame assembly (11) and the housing (13), the housing (13) comprising a cover (131), the The stator frame assembly (11) is accommodated in the assembly chamber of the cover (131), the injection mold for rotary transformers comprising a mold cavity (31), the following being arranged in the mold cavity (31): a positioning gap (32) which is used for positioning the stator frame assembly (11 ) serves; a stop plate (33) which is matched to the cover (131) for sealing the mounting chamber of the cover (131). Injection mold for rotary transformers according to Claim 9 , characterized in that cores (34) are further arranged in the mold cavity (31) for the integral molding of the mounting holes (1351). Injection mold for rotary transformers according to Claim 9 , characterized in that the injection mold for rotary transformers comprises a movable mold (4) and a fixed mold (3), the movable mold (4) and the fixed mold (3) being matched to one another so that they together form a mold cavity (31 ) form, the mold cavity (31) for one-piece Injection molding of the stator frame assembly (11) and the housing (13) is used. Injection mold for rotary transformers according to Claim 11 , characterized in that the movable molding tool (4) comprises two opposing core pulling slides (5), the two core pulling slides (5) having coordinated, graduated structures so that the two can be inserted into one another, the two core pulling slides (5) for Shapes of the lower portion of the mounting body (133) or the connecting portion of the mounting body (134) are used. Injection mold for rotary transformers according to Claim 11 , characterized in that the movable molding tool (4) comprises two opposing core pulling slides of the lower section of the mounting body (6) and one core pulling slide of the connecting section of the mounting body (7), the two opposing core pulling slides of the lower section of the mounting body (6) for molding of the lower portion of the mounting body (133) are used and the core pulling slide of the connecting portion of the mounting body (7) is used to form the connecting portion of the mounting body.

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