RU2346348C1 - Mounting assembly of switching asembly for air circuit breaker and method for manufacturing thereof - Google Patents

Abstract

FIELD: physics, control.

SUBSTANCE: invention relates to mounting assembly of switching assembly for air circuit breaker with multiple turning shafts. Mounting assembly comprises: thrust bearing, which supports at least one of turning shafts; thrust bearing supporting element, which comprises a wall of axial bore for the turning shaft; a part with inner diameter, which contacts with the thrust bearing, flanged part, extending fron the inner diameter part, rounded part formed by inner diameter part and flanged part, and annular recessed part in the lower section of the flanged part formed in order to extend the inner diameter part and to reduce length of the rounded part, which is necessary to increase the area of contact with the thrust bearing. Increased area of contact between the thrust bearing and its supporting element provides for minimised strain of the bearing supporting element caused by axial load.

EFFECT: minimised strain of the bearing supporting element caused by axial load.

3 cl, 9 dwg

Description

FIELD OF THE INVENTION

This invention relates to a switching mechanism of an air circuit breaker such as a low voltage circuit breaker and, in particular, to a support assembly on which at least one of the rotary shafts rests, so that it can rotate smoothly, providing an effective support that accepts a large axial load.

State of the art

The air circuit breaker comprises a switching mechanism that opens or closes the current-conducting circuit, a frame unit for accommodating the switching mechanism having a terminal portion connected to an external power source and load, and a monitoring and control unit that detects an emergency current of the connected current transmission circuit and provides drive energy for automatically moving the switching mechanism to the open (off) position.

This invention relates to a switching mechanism, which is called the main circuit part of the main parts of the air circuit breaker, and the following describes the reference node according to the prior art.

In an air circuit breaker, a closing spring load operation, a closing operation and an opening (shutdown) operation are the main operations of an air circuit breaker. In particular, during the load operation, a large load is applied to the cam, which charges the closing spring with high elastic energy in accordance with the high spring coefficient of elasticity.

Thus, to support a large load and ensure smooth rotation, a support is used, and the support structure can be deformed or damaged by the load in the direction of the axis in accordance with the structure on which the support is supported.

As shown in FIG. 1, a switching mechanism for an air circuit breaker is installed between both side plates 6a, 6b, with 1 indicating a cam shaft, namely a rotary shaft of the charging cam (indicated by 2 in FIG. 2) for the load of the closing spring (not shown) and at 5, a handle connected to one end of the cam shaft 1 to rotate the cam shaft 1 manually. The cam shaft 1 penetrates both side plates 6a and 6b and extends from one of the side plates 6a and 6b.

As shown in FIG. 2, the support assembly of the switching mechanism is mounted on the outside of the two charging cams 2 on the cam shaft 1, respectively, for supporting the cam shaft 1, so that the cam shaft 1 can rotate smoothly.

As shown in FIG. 3, the support assembly, according to the prior art, includes a thrust bearing 3, which has a flange part and is made essentially in the form of a ring, and a thrust bearing element 4, which rotates the thrust bearing 3.

Below is a detailed description with reference to figure 4 of the design of the support element 4 of the thrust bearing, which supports rotatably supports the thrust bearing 3, in the support node, according to the prior art.

The support element 4 of the thrust bearing, according to the prior art, includes a flange part 4a that allows the thrust bearing 3 to be mounted on it, a part 4c with an inner diameter with which the thrust bearing comes into contact during rotation, a rounded part 4b formed between the flange part 4a and part 4c with an inner diameter, and the wall 4d of the axial hole, allowing passage through it of the cam shaft 1.

Below is a description of a method of manufacturing a support node, according to the prior art, with reference to figures 5 and 6.

First, a substantially rectangular shape starting material is prepared for the thrust bearing support element 4.

Then, as shown in FIG. 5, the raw material is extruded down to obtain a substantially U-shaped semi-finished material with a flange.

Then, as shown in FIG. 6, the middle part is cut through in the diameter direction of the semi-finished material to form a substantially U-shaped thrust bearing element 4 with a central through hole.

Thereafter, the thrust bearing 3 is introduced into the part with an inner diameter of a substantially U-shaped thrust bearing element 4 to complete the manufacture of the bearing assembly shown in FIG. 3.

However, in the support assembly, according to the prior art, the rounded portion 4b is large (namely, the height of the rounded portion 4b is large, as shown in FIG. 4), while the inner diameter portion 4c in contact with the thrust bearing 3 is short.

Thus, the load of the thrust bearing, which is heavily loaded in the axial direction, is concentrated on the short part 4c with an inner diameter, causing problems of deformation and damage to the support element 4 of the thrust bearing.

SUMMARY OF THE INVENTION

Therefore, to eliminate the above disadvantages, various features have been developed, the description of which is given below. According to one aspect of the invention, there is provided a support assembly of a switching mechanism for an air circuit breaker in which a part with an inner diameter that is in contact with the thrust bearing is long for axial load distribution applied to the thrust bearing support element.

According to another aspect of the invention, there is provided a method of manufacturing a switching unit support assembly for an air circuit breaker.

This description provides a support assembly of a switching mechanism for an air circuit breaker having a plurality of rotary shafts, the support assembly may include: a thrust bearing on which at least one of the rotary shafts rests, so that it can rotate smoothly and which includes an annular portion of the housing and a flange portion protruding from the housing; and a thrust bearing support element that includes an axial bore wall defining an axial bore through which the rotary shaft passes, an inner diameter portion extending from the axial bore wall and contacting an thrust bearing, a flange portion extending from the inner diameter portion, a rounded portion formed between the part with the inner diameter and the flange part, and the annular recessed part formed in the lower part of the flange part by stamping to extend the part with the inner ametrom and reduce the length of the rounded portion thereby to increase the area of contact with the thrust bearing.

The description also provides a method for manufacturing a support assembly of a switching mechanism for an air circuit breaker, which may include: forming a U-shaped unfinished workpiece with a flange portion by extruding down a flat source material; the formation of an annular deepened part by squeezing up the bottom of the flange part of the unfinished workpiece; forming an axial hole by cutting the bottom of the unfinished workpiece and assembling by introducing an annular thrust bearing into the bearing support element.

The above and other objectives, features, aspects and advantages of the present invention follow from the following detailed description of the present invention with reference to the accompanying drawings.

Brief Description of the Drawings

The accompanying drawings, which are included to provide a better understanding of the invention and form part of this description, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention, and they depict:

figure 1 is a switching mechanism for an air circuit breaker in which a support node is installed, according to this invention or according to the prior art, in isometric view;

figure 2 - reference node in the installation state on the cam shaft in the switching mechanism for an air circuit breaker, according to this invention or according to the prior art, in isometric view;

figure 3 - reference node in the assembled state of the switching mechanism for an air circuit breaker, according to this invention or according to the prior art, in isometric view;

Fig. 4 is a sectional view of a bearing element of a bearing of a bearing assembly of a switching mechanism for an air circuit breaker according to the prior art;

figure 5 - the process of forming a U-shaped intermediate material with a flange part by extruding down a flat source material in the manufacture of the support node of the switching mechanism for an air circuit breaker, according to the prior art;

6 is a process of forming a through hole by cutting through a U-shaped unfinished workpiece support node, according to the prior art;

Fig. 7 is a sectional view of a bearing support member of a support assembly of a switching mechanism for an air circuit breaker according to the present invention;

Fig - bearing support element of the support node of the switching mechanism for an air circuit breaker, according to this invention, in isometric view; and

Fig.9 - the manufacturing process of the support node of the switching mechanism for an air circuit breaker, according to this invention.

DETAILED DESCRIPTION OF THE INVENTION

The purpose, design to achieve the goal and the operational effect of the present invention follows from the following detailed description of an embodiment of the present invention with reference to the accompanying drawings.

As shown in FIG. 3, the support assembly according to the invention includes a thrust bearing 3, which has a flange portion and a substantially annular shape, and a thrust bearing element 4, which rotatably supports the thrust bearing 3.

Below is a detailed description with reference to Figs. 7 and 8 of the construction of a support element 4 of a thrust bearing, which rotatably supports the thrust bearing 3, in a support assembly according to this invention.

The support element 4 of the thrust bearing, according to this invention, includes a flange part 4a that allows the thrust bearing 3 to be mounted on it, an inner diameter part 4c, in contact with which the thrust bearing 3 is in contact with it, a rounded part 4b formed between the flange part 4a and part 4c with an inner diameter, the wall 4d of the axial hole allowing passage of the cam shaft 1 through it; and an annular recessed part 4e formed in the lower part of the flange part 4a by stamping to extend the inner diameter part 4c and reduce the length of the rounded part 4b, thereby increasing the contact area with the thrust bearing 3.

An annular recessed portion 4e of the thrust bearing support element 4 is formed as a part where the part with the outer diameter and the flange part 4a of the thrust bearing support element 4 converge.

The following is a description with reference to FIG. 9 of a method for manufacturing a support assembly according to the present invention.

First, as shown in the uppermost part of FIG. 9, a substantially rectangular-shaped starting material is prepared for the thrust bearing support element 4.

Then, as shown in the second drawing from above in FIG. 9, the raw material is extruded downward to form a substantially U-shaped unfinished blank with a flange.

Then, as shown in the third drawing from the top in FIG. 9, the lower part of the flange portion of the unfinished workpiece is compressed upward to form an annular recess.

After that, as shown in the fourth drawing from the top in Fig. 9, the middle part is cut down in the diameter direction of the unfinished workpiece with the formation of a substantially U-shaped thrust bearing element 4 with a central axial bore.

After that, as shown in the lowest drawing in Fig. 9, the thrust bearing 3 is inserted into the part with the inner diameter of the substantially U-shaped thrust bearing element 4 to complete the production of the bearing assembly.

From the above it follows that, compared with the prior art, in the bearing assembly according to this invention, since the part with the inner diameter in contact with the bearing is elongated, a large axial load can be distributed, which provides effective bearing support.

Additionally, by using the method of manufacturing the support assembly according to the present invention, a bearing is created that is effectively supported.

Since this invention can be implemented in various forms without departing from the idea or their essential characteristics, it is understood that the above embodiments are not limited to any details of the above description, unless otherwise indicated, but should be understood in a broad sense within the scope defined the attached claims, and therefore all changes and modifications that are included in the scope of the claims or their equivalents are covered by the attached claims.

Claims (3)

1. The reference node of the switching mechanism for an air circuit breaker having a plurality of rotary shafts, comprising:
a thrust bearing on which at least one of the rotary shafts rests, so that it can rotate smoothly, and which includes an annular part of the housing and a flange part protruding from the housing; and
a thrust bearing support element that includes an axial bore wall forming an axial bore through which the rotary shaft passes, a part with an inner diameter extending from an axial bore wall and contacting a thrust bearing, a flange part extending from an inner diameter part, a rounded part, formed between the part with the inner diameter and the flange part, and the annular recessed part formed in the lower part of the flange part by stamping to extend the part with the inner diameter meter and reduce the length of the rounded part to thereby increase the area of contact with the thrust bearing. 2. The assembly according to claim 1, in which the annular recessed part of the thrust bearing support element is formed in the part where the part with the outer diameter and the flange part of the thrust bearing support element meet. 3. A method of manufacturing a support node of the switching mechanism for an air circuit breaker, comprising:
forming a U-shaped unfinished workpiece with a flange portion by extruding down a flat source material;
the formation of an annular deepened part by pressing up the bottom of the flange part of the unfinished workpiece;
the formation of an axial hole by cutting the bottom of the unfinished workpiece; and
assembly by introducing an annular thrust bearing into the bearing support member.

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