WO2021186553A1 - Bearing holding device and air breaker provided with said bearing holding device - Google Patents

Abstract

Provided is a bearing holding device that can hold a bearing without increasing the number of components even with a sheet metal frame that is thinner than the thickness of the bearing in the axial direction thereof.　A bearing holding device 1 according to the present disclosure is provided with: a bearing 4; a stepped shaft 3 that is rotatably held by the bearing 4; and a sheet metal frame 2 that has a thickness that is equal to or less than the thickness of the bearing 4 in the axial direction thereof and is provided with a bearing mounting hole 2a in which the bearing 4 is mounted. The bearing 4 includes an outer ring 4b and an inner ring 4a. The stepped shaft 3 includes a step part 3a at an end section thereof, and a small diameter part 3b formed to have a contracted diameter by way of the step part 3a. The small diameter part 3b is inserted into the inner ring 4a until the step part 3a runs up against the inner ring 4a of an inner surface 4c side of the bearing 4. A claw part 2b is provided at a circumferential surface 2e of the bearing mounting hole 2a, the claw part 2b extending in an axial direction from a mounting hole edge 2f of an outer wall surface 2d side of the sheet metal frame 2 and abutting the outer ring 4a at an outer surface 4d side of the bearing 4.

Description

Bearing holding device and air circuit breaker equipped with this bearing holding device

The present disclosure relates to a bearing holding device applied to an aerial circuit breaker, and an aerial circuit breaker using the bearing holding device.

Generally, a bearing is assembled in a housing having a thickness equal to or greater than the axial thickness of the bearing, and a shaft is supported to realize a rotational motion.
On the other hand, in the air breaker, the bearing holding device used as a device having a bearing positioning and holding function for rotatably supporting the shaft in the opening / closing mechanism is the axial thickness of the bearing in order to realize the weight reduction of the whole device. A sheet metal frame, which is thinner than the above, is used for bearing holding. When an attempt is made to insert the bearing directly into the sheet metal frame, it is difficult to restrain the movement in the swing direction of the shaft, so that it is difficult to give the sheet metal frame a bearing positioning and holding function.
In the conventional air circuit breaker, in order to suppress the swing of the bearing shaft, the bearing is inserted into the Jikuke, which is thicker than the sheet metal frame, and then assembled to the sheet metal frame to position and hold the bearing. (See, for example, Patent Document 1).

Actual Kaihei 5-69843

In the circuit breaker according to Patent Document 1, when assembling a bearing to a sheet metal frame (mechanical frame in Patent Document 1), it is essential to insert and hold the bearing, so that the number of parts increases, and the product weight and assembly There is a drawback that the man-hours have increased. Further, as the assembly man-hours increase, there is a problem that the assembly accuracy deteriorates due to the accumulation of tolerances.

The present disclosure has been made in order to solve the above-mentioned problems, and it is possible to firmly receive a load without increasing the number of parts for a sheet metal frame whose plate thickness is thinner than the axial thickness of the bearing. It is possible to obtain a bearing holding device that can reduce the number of assembly steps and has a highly reliable bearing positioning and holding function.
Further, an air circuit breaker using this bearing holding device is obtained.

The bearing holding device according to the present disclosure includes a bearing, a stepped shaft rotatably held by the bearing, and a sheet metal frame having a thickness equal to or less than the axial thickness of the bearing and provided with a bearing mounting hole for mounting the bearing. The bearing has an outer ring, an inner ring inside the outer ring, an inner surface facing the insertion direction of the stepped shaft, and an outer surface opposite the inner surface, and the stepped shaft is at the end. It has a stepped portion and a small diameter portion formed by reducing the diameter through the stepped portion, and the small diameter portion is inserted into the inner ring until the stepped portion abuts on the inner ring on the inner side surface side of the bearing. It has an inner wall surface on the mounting side and an outer wall surface on the opposite side of the inner wall surface in the thickness direction, and the bearing mounting holes are axially oriented from the mounting hole edge on the outer wall surface side on the circumferential surface of the bearing mounting holes. It has a claw portion that extends and abuts on the outer ring on the outer surface side of the bearing.
Further, in the aerial circuit breaker according to the present disclosure, the bearing holding device according to the present disclosure is attached to the circuit breaker main body.

According to the bearing holding device according to the present disclosure, even if the sheet metal frame is thinner than the axial thickness of the bearing, the bearing can be positioned and held without increasing the number of parts, the assembly man-hours can be reduced, and the assembly can be performed. It is possible to prevent deterioration of accuracy.
Further, according to the aerial circuit breaker provided with the bearing holding device according to the present disclosure, it is possible to reduce the weight of the product and improve the reliability of the product by reducing the number of parts.

It is a perspective view of the air circuit breaker which concerns on Embodiment 1 of this disclosure. FIG. 5 is a perspective view in which a drawer frame in a state in which the circuit breaker main body in the aerial circuit breaker according to the first embodiment of the present disclosure is pulled out from the drawer frame is partially cut. It is a perspective view which cut a part of the drawer frame in the state which the circuit breaker main body is inserted into the drawer frame in the air circuit breaker which concerns on Embodiment 1 of this disclosure. FIG. 5 is a side sectional view showing a trip state in which the closing spring of the circuit breaker main body is released in the air circuit breaker according to the first embodiment of the present disclosure. It is a side sectional view which shows the off state which the charge of the circuit breaker main body is completed in the air circuit breaker which concerns on Embodiment 1 of this disclosure. It is a side sectional view which shows the on state of the circuit breaker main body in the air circuit breaker which concerns on Embodiment 1 of this disclosure. It is a front view of the main shaft in the aerial circuit breaker which concerns on Embodiment 1 of this disclosure. It is an exploded perspective view of the bearing holding device which concerns on Embodiment 1 of this disclosure. It is a side view of the outer wall surface side of the sheet metal frame of the bearing holding device which concerns on Embodiment 1 of this disclosure. It is a perspective view of the bearing holding device which concerns on Embodiment 1 of this disclosure. It is sectional drawing which shows the bearing holding device which concerns on Embodiment 1 of this disclosure. It is sectional drawing which shows the bearing holding device which concerns on Embodiment 2 of this disclosure. It is an enlarged perspective view of the bearing mounting hole of the sheet metal frame of the bearing holding device which concerns on Embodiment 3 of this disclosure. It is a perspective view which shows the sheet metal frame in the bearing holding device which concerns on Embodiment 4 of this disclosure. It is sectional drawing which shows the bearing holding device which concerns on Embodiment 4 of this disclosure. It is a perspective view of the bearing holding device which concerns on Embodiment 5 of this disclosure. It is sectional drawing which shows the bearing holding device which concerns on Embodiment 5 of this disclosure.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In each of the following embodiments, the same reference numerals are given to the same components.

Embodiment 1.
FIG. 1 is a perspective view of the aerial circuit breaker according to the first embodiment, and FIG. 2 shows a part of the drawer frame in a state where the circuit breaker main body of the aerial circuit breaker according to the first embodiment is pulled out from the drawer frame. A perspective view, FIG. 3 is a perspective view in which the circuit breaker main body of the circuit breaker according to the first embodiment is partially cut, and FIG. 4 is an aerial view according to the first embodiment. A side sectional view showing a trip state in which the closing spring of the circuit breaker is released, FIG. 5 is a side sectional view showing an off state in which charging of the aerial circuit breaker according to the first embodiment is completed, and FIG. It is a side sectional view which shows the on state of the aerial circuit breaker which concerns on.

In FIG. 1, the aerial circuit breaker 300 is composed of a circuit breaker main body 100 that opens and closes an electric circuit, and a drawer frame 200 that houses the circuit breaker main body 100 so that it can be pulled out. The circuit breaker main body 100 is covered with a housing 101 including a mold case 101a and a mold cover 101b, and a drawer mechanism 15 for pulling out the circuit breaker main body 100 from the drawer frame 200 is provided at the lower part of the housing 101. ing. On the front surface of the housing 101, an ON button 11 for operating the charge arm 24 in the side sectional view shown in FIG. 4 to insert the movable contactor 43 and a trip latch 31 in the side sectional view shown in FIG. 4 are operated for movable contact. An OFF button 12 for pulling out the child 43 and a handle 13 for manually accumulating the closing spring 17 in the side sectional view shown in FIG. 4 are provided.

An insertion hole 14 into which a drawer handle (not shown) used when pulling out the circuit breaker main body 100 is provided is provided on the front surface of the drawer mechanism 15.
The drawer frame 200 is provided with a telescopic drawer rail 200a to which the circuit breaker main body 100 is attached at one end.
As shown in FIG. 3, the circuit breaker main body 100 is inserted into the drawer frame 200. Normally, the circuit breaker main body 100 is used in a state of being inserted into the drawer frame 200.

When it becomes necessary to pull out the circuit breaker body 100 from the drawer frame 200 due to circumstances such as maintenance of the circuit breaker body 100, the drawer handle inserted from the insertion hole 14 from the inserted state of the circuit breaker body 100 shown in FIG. (Not shown) is rotated. From the state of FIG. 3, the circuit breaker main body 100 moves in the direction of arrow E and is pulled out from the drawer frame 200 to a predetermined position. After that, by pulling out the circuit breaker main body 100 from the drawer frame 200, the drawer state shown in FIG. 1 is obtained.

Next, the opening / closing mechanism of the circuit breaker main body 100 will be described.
As shown in FIGS. 4, 5 and 6, the housing 101 is composed of a mold case 101a and a mold cover 101b. The camshaft 21 is rotatably supported by the sheet metal frame 2 (shown in FIG. 2) on the housing 101. The charging cam 22 and the ratchet 23 are fixed around the cam shaft 21, and a cam side roller 22a is provided between the charging cam 22 and the ratchet 23. It has a circumferential cam surface 22b.

Above the charging cam 22, there is a charging arm 24 that rotates with the fixed shaft 24a as a fulcrum, and an arm-side roller 24b is provided at one end of the charging arm 24 to rotate the circumferential cam surface 22b of the charging cam 22. When they come into contact with each other, they are rotationally driven by the charging cam 22 together with the charging arm 24 with the fixed shaft 24a as a fulcrum. An operating surface 24c is formed on the upper surface of the middle abdomen of the charge arm 24, and as shown in FIGS. 4, 5, and 6, the shape is such that the radius of curvature changes toward the right side of the drawing. .. A spring chip pin 24d is provided at the other end of the charge arm 24.

On the right side of the charging cam 22, a guide plate 18 for holding the charging spring 17 is fixed to the housing 101, and the guide plate 18 has an elongated hole 18a. A spring break pin 24d penetrates the elongated hole 18a so that it can move along the elongated hole 18a, and moves along the elongated hole 18a to store the input spring 17.

A first closed latch 25 is rotatably attached to the fixed shaft 24a on the fixed shaft 24a, has a latch-side roller 25a on the middle abdomen, and forms two working surfaces on one end surface thereof. Can engage with the cam-side roller 22a. One of the working surfaces is a regulating surface extending in the vertical direction at the right end in FIG. 4 of the first closed latch 25, and when the cam-side roller 22a abuts on this surface, the charging cam 22 rotates further. It regulates. The other one of the working surfaces is an allowable surface extending diagonally downward to the left from the lower end of the regulation surface in FIG. 4, and when the cam-side roller 22a abuts on this surface, the charging cam 22 is counterclockwise. Allows rotation of. At the start of energization of the closing spring 17, the cam-side roller 22a engages with the allowable surface as shown in FIG.

A second closed latch 26 that rotates about a fixed shaft 26a is provided above the first closed latch 25, and the lower end of the second closed latch 26 engages with the latch-side roller 25a. It has a side protruding portion and a stepped engaging portion formed below the side protruding portion, and the upper end portion of the second close latch 26 engages with a close bar 27 having a partially D-cut shape. There is.
Further, the second closed latch 26 receives a force in the counterclockwise direction in FIG. 4 by a return spring (not shown). The close bar 27 is turned on (rotated clockwise) manually by the ON button 11 or by a solenoid or the like.

Further, as shown in FIG. 2, a rail detection lever 51 for detecting the withdrawn state of the circuit breaker main body 100 is provided inside the side surface of the drawer frame 200. FIG. 4 shows the close plate 56 fixed to the close bar 27 (shown in FIG. 4) by rotating the close plate 56 via the rail detection lever 51, the shaft 53, the interlocking plate 54, and the push-up lever 55. The closing bar 27 is driven to release the closing spring 17.

The main shaft 28, which will be described later, is rotatably supported by a sheet metal frame 2 (shown in FIG. 2) fixed to the housing 101.
As shown in FIG. 4, the input toggle link mechanism 29 is configured by connecting two links, a first link 29a and a second link 29b, by a central pin 29d, and a main shaft on the second link 29b side by a pin 29c. It is connected to a second link arm 28b (shown in FIG. 7) fixed to 28.
A link-side roller 29e that is rotatably supported is provided around the center pin 29d, and is in a positional relationship of contacting the operating surface 24c when the closing toggle link mechanism 29 is in the bent state.

A link lever 30 rotatably supported by the fixed shaft 30a is provided above the closing toggle link mechanism 29, and the first link 29a side of the closing toggle link mechanism 29 is connected to one end side by a pin 30b. A lever-side roller 30c rotatably provided is provided in the middle portion of the link lever 30, and a trip latch 31 rotatably supported by the fixed shaft 26a is provided on the left side of the lever-side roller 30c in FIG. There is. The trip latch 31 has a side surface portion engaged with the lever side roller 30c and an upper end portion engaged with a trip bar 32 having a partially D-cut shape. A directional rotational force is given. The trip bar 32 is designed to be tripped (rotated counterclockwise) manually by the OFF button 12 or by a solenoid or the like.

Next, the energy accumulation operation and the contact charging operation of the closing spring 17 will be described. In the trip state of FIG. 4 in which the closing spring 17 is released, the ratchet 23 is rotated counterclockwise by manually pushing down the handle 13 in the direction of arrow D, and is coaxially fixed by the cam shaft 21 for charging. When the cam 22 is rotated counterclockwise, the arm-side roller 24b supported by the left end of the charge arm rolls along the circumferential cam surface 22b, so that the arm-side roller 24b moves to the left in FIG. As a result, the charge arm 24 rotates clockwise around the fixed shaft 24a, and the spring cap pin 24d provided at the other end moves downward in FIG. 4, and the charging spring 17 is stored.

On the other hand, since the second closed latch 26 receives a counterclockwise force by a return spring (not shown), the side protruding portion at the lower end of the second closed latch 26 comes into contact with the latch side roller 25a, which is shown in FIG. The first closed latch 25 is pushed clockwise to rotate the first closed latch 25 clockwise, but the lower surface of the first closed latch 25 on one end side, that is, the allowable surface and the cam side roller 22a are in contact with each other. Therefore, the cam-side roller 22a serves as a stopper, and the first closed latch 25 is held in a non-rotatable state.

When the charging spring 17 continues to accumulate energy and the charging cam 22 further rotates counterclockwise, the cam-side roller 22a separates from the lower surface on one end side of the first closed latch 25, that is, the allowable surface. At this time, the first closed latch 25 rotates clockwise, the latch side roller 25a rotates clockwise and comes off from the side protrusion of the lower end of the second closed latch 26, and the lower end of the second closed latch 26. Free.
As a result, the second close latch 26 is rotated counterclockwise by the return spring, and when the upper end of the second close latch 26 exceeds the close bar 27 and moves to the left of the close bar 27, the first close latch 26 is closed. The latch-side roller 25a of the latch 25 engages with the engaging portion at the lower end of the second closed latch 26 to stop the movement of the second closed latch 26.
At this time, at the upper end of the second close latch 26, the close bar 27 is rotated counterclockwise by a return spring (not shown) to enter the second state (the state of the close bar 27 in FIG. 6), and the second close. Even if a clockwise rotational force acts on the latch 26, it functions as a stop against it.

The accumulator operation of the charging spring 17 continues, and the clockwise rotation of the charge arm 24 causes the operating surface 24c to move downward in FIG. 5 to move away from the link-side roller 29e of the charging toggle link mechanism 29. Due to the bending force of the closing toggle link mechanism 29, the link side roller 29e follows the downward movement of the operating surface 24c and pulls down the link on the left side in FIG. 5 of the closing toggle link mechanism 29. Therefore, since the pin 30b at the other end of the closing toggle link mechanism 29 moves downward, the link lever 30 rotates counterclockwise, and the lever side roller 30c also rotates counterclockwise.
As a result, the trip latch 31 is rotated clockwise by the return spring. When the trip latch 31 exceeds the trip bar 32 and moves to the right, the lever-side roller 30c engages with the recess (FIG. 5) of the trip latch 31, and the trip bar 32 is clockwise due to a return spring (not shown). Even if a counterclockwise rotational force acts on the trip latch 31, it functions as a stopper against it.

Since the closing toggle link mechanism 29 does not bend beyond a predetermined bending state, it is in the state shown in FIG. The charging cam 22 is rotated substantially once by pushing down the handle 13 several times, and finally in the state shown in FIG. 5, that is, the position where the arm-side roller 24b of the charging arm 24 is slightly before the maximum radius of the charging cam 22. Is reached, the cam-side roller 22a again comes into contact with the end surface of the first closed latch 25, that is, the regulation surface, and is in a stopped state.
After that, even if the handle 13 is further pushed down, the ratchet 23 only idles, the charging cam 22 does not rotate, and the charging spring 17 is completed.

In the state of FIG. 5, the spring force of the input spring 17 pushes the spring break pin 24d upward to exert a counterclockwise force on the charge arm 24. Since this force is transmitted to the charging cam 22 via the arm-side roller 24b, the cam-side roller 22a pushes the end surface of the first closed latch 25, that is, the regulation surface counterclockwise, and as a result, the first The latch-side roller 25a of the close latch 25 pushes the lower end engaging portion of the second close latch 26 to the left to rotate the second close latch 26 clockwise, but the upper end of the second close latch 26 The close bar 27 serves as a stopper at the portion to prevent the second close latch 26 from rotating clockwise.

In this state, when the ON button 11 of FIG. 1 is pressed, the close bar 27 is rotated clockwise to be turned on, and the lock of the upper end of the second close latch 26 by the close bar 27 is released. The close latch 26 rotates clockwise, and the lower end engaging portion thereof and the latch side roller 25a are disengaged.

As a result, the cam-side roller 22a rotates in the same direction while rotating the first close latch 25 in the counterclockwise direction, and the charging cam 22 also rotates in the same direction, so that it is supported by the left end of the charge arm 24. The arm-side roller 24b falls into the stepped portion of the circumferential cam surface 22b of the charging cam 22, and the charging arm 24 rotates counterclockwise as shown in FIG. 6 due to the releasing force of the closing spring 17, and the operating surface 24c thereof. Raises the link side roller 29e of the input toggle link mechanism 29.

Therefore, the link on the left side of the closing toggle link mechanism 29 moves upward and tries to rotate the link lever 30 clockwise, but the lever side roller 30c comes into contact with the trip latch 31, and the trip latch 31 is moved by the trip bar 32. Since the counterclockwise movement is locked, the closing toggle link mechanism 29 extends to the right and rotates the second link arm 28b counterclockwise to move the movable contact 43 to the right. In the state shown in FIG. 6, the contact 43a and the contact 44a provided on the conductor 44 are turned on.

In the on state shown in FIG. 6, the closing toggle link mechanism 29 is pushed to the left by the pressing force of the pressure contact spring 45, and a clockwise rotational force is applied to the link lever 30 via the pin 30b to push the lever side roller 30c. The trip latch 31 is pressed counterclockwise through the trip latch 31, but the trip latch 31 is prevented from rotating counterclockwise by the trip bar 32.

When the OFF button 12 of FIG. 1 is pressed in this state, the trip bar 32 rotates counterclockwise to perform a trip operation, and the trip latch 31 rotates counterclockwise due to the above-mentioned acting force. Therefore, the trip latch 31 The lever-side roller 30c is disengaged from the recess, and the link lever 30 rotates clockwise. As a result, the pin 30b at the other end of the closing toggle link mechanism 29 moves upward, and the closing toggle link mechanism 29 bends. At this time, the link-side roller 29e of the closing toggle link mechanism 29 moves to the left along the operating surface 24c of the charge arm 24, and the pin 29c drives the insulating link 41 to the left to move the movable contactor 43 to the left. When operated, the contacts 43a and 44a are turned off, and the state returns to the state shown in FIG. Hereinafter, the above operation is repeated.

Next, the configuration of the shaft, which is the rotating shaft of the opening / closing mechanism, will be described by taking the main shaft 28 as an example.
FIG. 7 is a front view of the main shaft 28, which is an example of a shaft in an aerial circuit breaker. As shown in FIG. 7, an insulating link arm 28a and a second link arm 28b having the same shape as the insulating link arm 28a are fixed to the main shaft 28. The insulating link arm 28a and the second link arm 28b are provided with pins 42 and 29c for driving the links, respectively.
The main shaft 28 is a stepped shaft having a stepped portion 28c at both ends in the axial direction and a small diameter portion 28d formed by reducing the diameter via the stepped portion 28c. The small diameter portion 28d of the main shaft 28 is fixed to a bearing attached to the sheet metal frame 2 and is rotatably supported.
In the aerial circuit breaker 300, shafts such as the main shaft 28 and the cam shaft 21 are rotatably supported by bearings attached to the sheet metal frame 2 fixed to the housing 101 as part of the components of the opening / closing mechanism. Has been done.

Next, the configuration of the bearing holding device, which is a device having a bearing positioning and holding function attached to the housing 101 of the circuit breaker main body 100, will be described.
FIG. 8 is a diagram showing the configuration of the bearing holding device 1 according to the first embodiment. 8 (a) is an exploded perspective view of the bearing holding device 1, and FIG. 8 (b) is an enlarged view of a portion shown by the alternate long and short dash line A in FIG. 8 (a). FIG. 8C is an enlarged schematic view of the bearing 4 on the left side in FIG. 8A.
FIG. 9 is a side view of the sheet metal frame 2 of the bearing holding device 1 on the outer wall surface side.
FIG. 10 is a perspective view showing the bearing holding device 1.
FIG. 11 is a cross-sectional view of the bearing holding device 1 at the position of the alternate long and short dash line B shown in FIG.

The bearing holding device 1 according to the first embodiment includes a bearing 4, a stepped shaft 3 rotatably held by the bearing 4, and a sheet metal frame 2 provided with a bearing mounting hole 2a for mounting the bearing 4.

The bearing 4 has an outer ring 4a and an inner ring 4b inside the outer ring 4a. The inner ring 4b can rotate with an extremely small resistance with respect to the outer ring 4a. Further, the bearing 4 has an inner side surface 4c facing the insertion direction of the stepped shaft 3 and an outer side surface 4d opposite to the inner side surface 4c.

The sheet metal frame 2 is a pair having a thickness equal to or less than the thickness of the bearing 4 in the axial direction, fixed to the housing 101, and arranged to face each other. The sheet metal frame 2 has an inner wall surface 2c on the side where the bearing 4 is mounted, and an outer wall surface 2d on the opposite side of the inner wall surface 2c in the thickness direction. The bearing mounting hole 2a penetrating the sheet metal frame 2 has an inner diameter corresponding to the outer ring 4a of the bearing 4. The circumferential surface 2e of the bearing mounting hole 2a has a claw portion 2b extending in the axial direction from the mounting hole edge portion 2f on the outer wall surface 2d side. The claw portion 2b abuts on the outer ring 4a on the outer surface 4d side of the bearing 4 to hold the bearing 4, and regulates the movement of the bearing 4 outward from the claw portion 2b.

The bearing mounting hole 2a and the claw portion 2b are integrally molded by press working. As a result, the number of processing steps does not increase, and the strength of the claw portion 2b can be increased.
The stepped shaft 3 has a stepped portion 3a at both end portions in the axial direction and a small diameter portion 3b formed with a reduced diameter via the stepped portion 3a, respectively. In the stepped shaft 3, the small diameter portion 3b is inserted into the inner ring 4b of the bearing 4 until the step portion 3a abuts on the inner ring 4b on the inner side surface 4c side of the bearing 4. The stepped shaft 3 is rotatably held by fixing the small diameter portion 3b to the inner ring 4b of the bearing 4.

Here, the stepped shaft 3 is a typical shaft configuration example, corresponds to a shaft such as the main shaft 28, and has a function of a rotating shaft like a shaft such as the main shaft 28. The stepped portion 3a of the stepped shaft 3 corresponds to the stepped portion 28c of the main shaft 28, and the small diameter portion 3b of the stepped shaft 3 corresponds to the small diameter portion 28d of the main shaft 28.
For convenience of explanation, the charging cam, arm, and the like are not shown. The bearing holding device can be similarly configured when a charging cam, an arm, or the like is attached to the stepped shaft, and has the same function.
Further, for convenience of explanation, FIG. 8 shows a state in which the sheet metal frame 2 has only one bearing mounting hole for mounting the bearing. In the bearing holding device, when a plurality of bearing mounting holes are mounted on one sheet metal frame, it can be configured in the same manner and has the same function.

In the first embodiment, the claw portion 2b is discontinuously provided at a plurality of locations along the mounting hole edge portion 2f of the bearing mounting hole 2a, and sandwiches the outer ring 4a of the bearing 4. The stability of holding the bearing 4 can be improved by providing the bearing mounting holes 2a at a plurality of locations at substantially equal intervals along the mounting hole edge 2f. FIG. 9 shows an example in which claw portions 2b are provided at three locations along the mounting hole edge portion 2f.
Further, as shown in FIGS. 10 and 11, in the bearing holding device 1, the bearing 4 is inscribed in the bearing mounting hole 2a provided in the sheet metal frame 2, so that the movement of the bearing 4 in the radial direction is restricted. The outer ring 4a of the bearing 4 abuts on the claw portion 2b on the outer wall surface 2d side of the sheet metal frame 2, the inner ring 4b of the bearing 4 abuts on the stepped portion 3a of the stepped shaft 3, and the bearing 4 has the claw portion of the bearing mounting hole 2a. By being sandwiched between the portion 2b and the stepped portion 3a of the stepped shaft 3, the movement of the bearing 4 in the thrust direction is restricted. As a result, the bearing 4 is positioned and held.
The shape of the claw portion 2b does not matter as long as it can sandwich the outer ring 4a of the bearing 4 and regulate the movement of the bearing 4 in the direction outward from the claw portion 2b.

Further, as shown in FIG. 11, the claw portion 2b is provided on the outer wall surface 2d side so as to be flush with the outer wall surface 2d. Since the claw portion 2b and the outer wall surface 2d are flush with each other, the claw portion 2b does not interfere with the parts arranged outside the sheet metal frame, so that the degree of freedom in designing the parts layout and the like is increased.

Since the thickness of the sheet metal frame 2 is less than or equal to the thickness of the bearing 4 in the axial direction, the bearing 4 is inserted into the bearing mounting hole 2a when the bearing 4 is mounted in the bearing mounting hole 2a until the outer ring 4a abuts on the claw portion 2b. Only the portion to be in contact with the circumferential surface 2e of the bearing mounting hole 2a. That is, in a state where the bearing 4 is mounted in the bearing mounting hole 2a, only a part of the outer ring 4a is inscribed in the circumferential surface 2e of the bearing mounting hole 2a in the axial direction. The portion of the bearing 4 other than a part thereof is exposed to the outside of the inner wall surface 2c of the sheet metal frame 2 on the side where the claw portion 2b is not provided.

In the aerial circuit breaker according to the first embodiment, the bearing holding device 1 is attached to the housing 101 of the circuit breaker main body 100.

According to the bearing holding device according to the first embodiment, even if the sheet metal frame is thinner than the axial thickness of the bearing, the bearing can be positioned and held without increasing the number of parts, and the assembly man-hours can be reduced. It is possible to prevent deterioration of assembly accuracy.
According to the aerial circuit breaker provided with the bearing holding device according to the first embodiment, the weight of the product can be reduced and the reliability can be improved by reducing the number of parts.

Embodiment 2.
The bearing holding device according to the second embodiment and the aerial circuit breaker using the bearing holding device will be described with reference to FIG.
In the second embodiment, the description of the same components or corresponding parts as those in the first embodiment of the present disclosure will be omitted. Hereinafter, the differences from the first embodiment of the bearing holding device according to the second embodiment will be described with reference to the drawings.
FIG. 12 is a cross-sectional view of the bearing holding device 102 according to the second embodiment corresponding to the position of the alternate long and short dash line B shown in FIG. Note that FIG. 12 is a cross-sectional view of the bearing holding device 102 according to the second embodiment, which corresponds to the case where the claw portions are provided at three positions along the mounting hole edge portion 2f as shown in FIG.

As shown in FIG. 12, in the bearing holding device 102, the sheet metal frame 202 has an inner wall surface 202c on the side where the bearing 4 is mounted and an outer wall surface 202d on the opposite side of the inner wall surface 202c in the thickness direction. On the circumferential surface 202e of the bearing mounting hole 202a, a claw portion 202b extending in the axial direction from the mounting hole edge portion 202f on the outer wall surface 202d side is provided.
In contrast to the structure in which the claw portion 2b in the first embodiment is flush with the outer wall surface 2d, in the bearing holding device according to the second embodiment, the claw portion 202b is located on the outer wall surface 202d side from the outer wall surface 202d. It has a structure that protrudes outward. Due to the structure in which the claw portion 202b projects outward from the outer wall surface 202d of the sheet metal frame 202, the bearing 4 is mounted by shifting in the thrust direction toward the outer wall surface 202d side of the sheet metal frame 202. That is, the contact surface between the outer ring 4a of the bearing 4 and the circumferential surface 202e of the bearing mounting hole 202a becomes large. Thereby, when a load is generated on the stepped shaft 3, the stress generated on the sheet metal frame 202 and the bearing 4 can be reduced.

Similar to the first embodiment, in the second embodiment, the claw portion 202b is discontinuously provided at a plurality of locations along the mounting hole edge portion 202f of the bearing mounting hole 202a. The shape of the claw portion 202b does not matter as long as it can sandwich the outer ring 4a of the bearing 4 and regulate the movement of the bearing 4 in the direction outward from the claw portion 202b.
Further, the bearing mounting hole 202a and the claw portion 202b are integrally molded by press working.

In the bearing holding device according to the second embodiment, the configuration other than the claw portion 202b of the sheet metal frame 202 is the same as the bearing holding device according to the first embodiment.
Further, the aerial circuit breaker using the bearing holding device according to the second embodiment can be configured in the same manner as the aerial circuit breaker using the bearing holding device according to the first embodiment.

According to the bearing holding device according to the second embodiment, even if the sheet metal frame is thinner than the axial thickness of the bearing, the bearing can be positioned and held without increasing the number of parts, and the assembly man-hours can be reduced. It is possible to prevent deterioration of bearing accuracy.
In addition, since the claws have a structure that projects outward from the outer wall surface of the sheet metal frame, the contact surface between the bearing and the bearing mounting hole becomes large, and the stress generated between the sheet metal frame and the bearing can be reduced, resulting in a product life. Can be improved.
According to the aerial circuit breaker using the bearing holding device according to the second embodiment, it is possible to reduce the weight of the product and improve the reliability and the life of the product by reducing the number of parts.

Embodiment 3.
The bearing holding device according to the third embodiment and the aerial circuit breaker using the bearing holding device will be described with reference to FIG.
In the third embodiment, the description of the same or corresponding parts as the first embodiment of the present disclosure will be omitted. Hereinafter, the points different from the first embodiment of the bearing holding device according to the third embodiment will be described with reference to the drawings.

FIG. 13 is an enlarged perspective view of a bearing mounting hole 203a in the sheet metal frame 203 of the bearing holding device according to the third embodiment corresponding to the portion indicated by the alternate long and short dash line A shown in FIG. 8A.
As shown in FIG. 13, in the third embodiment, the sheet metal frame 203 extends in the axial direction from the mounting hole edge portion 203f on the outer wall surface side of the sheet metal frame 203 on the circumferential surface 203e of the bearing mounting hole 203a. It has a claw portion 203b and dents 203 g formed at both ends of the root of the claw portion 203b.

The bearing mounting hole 203a, the claw portion 203b, and the recess 203g are integrally molded by two-step press working. First, the bearing mounting hole 203a and the recess 203g are simultaneously molded by press working. Next, the claw portion 203b is molded by press working. By molding the recess 203g at the same time as the bearing mounting hole 203a before molding the claw portion 203b, the stress generated when molding the claw portion 203b can be concentrated on the recess 203g. Compared with the case where the recess 203g is not molded, it is possible to prevent the bearing mounting hole 203a from being deformed due to the stress generated around the claw portion 203b.

In the third embodiment, the bearing 4 is sandwiched together with the claw portion 203b of the bearing mounting hole 203a and the stepped portion 3a of the stepped shaft 3. Further, the stability of holding the bearing 4 can be improved by providing the bearing mounting holes 203a at a plurality of locations at substantially equal intervals along the mounting hole edge portions 203f.

Next, the positional relationship between the claw portion 203b and the outer wall surface of the sheet metal frame 203 in the bearing holding device according to the third embodiment will be described.
In the third embodiment, the claw portion 203b can be provided on the same plane as the outer wall surface of the sheet metal frame 203 as in the bearing holding device 1 according to the first embodiment. In this case, since the claw portion does not interfere with the parts arranged outside the sheet metal frame, the degree of freedom in designing the parts layout and the like is increased.

Further, like the bearing holding device 102 according to the second embodiment, the claw portion 203b can be provided so as to project outward from the outer wall surface of the sheet metal frame 203. In this case, the contact surface between the bearing and the bearing mounting hole becomes large, the stress generated in the sheet metal frame and the bearing can be reduced, and the product life can be improved.
Even when the claw portion 203b projects outward from the outer wall surface of the sheet metal frame 203, the bearing mounting hole 203a, the claw portion 203b, and the recess 203g are integrally molded by two-step press working in the same manner.

In the bearing holding device according to the third embodiment, the configuration other than the recess 203g formed at the root of the claw portion 203b of the sheet metal frame 203 is the same as the bearing holding device according to the first embodiment or the second embodiment.
Further, the aerial circuit breaker using the bearing holding device according to the third embodiment can be configured in the same manner as the aerial circuit breaker using the bearing holding device according to the first embodiment.

According to the bearing holding device according to the third embodiment, as in the first embodiment, even if the sheet metal frame is thinner than the axial thickness of the bearing, the bearing positioning and holding function can be performed without increasing the number of parts. As a result, the assembly man-hours can be reduced and the deterioration of assembly accuracy can be prevented.
Further, by providing recesses at both ends of the claw portion in the sheet metal frame, it is possible to prevent deformation of the bearing mounting hole due to stress generated during molding of the claw portion. As a result, it is possible to prevent improper mounting of the bearing.
According to the aerial circuit breaker using the bearing holding device according to the third embodiment, the weight of the product can be reduced and the assembly man-hours can be reduced by reducing the number of parts, the deformation of the bearing mounting hole can be prevented, and the weight and reliability of the product can be reduced. It is possible to improve the sex.

Embodiment 4.
A bearing holding device according to the fourth embodiment and an aerial circuit breaker using the bearing holding device will be described with reference to FIGS. 14 and 15.
In the fourth embodiment, the description of the same or corresponding parts as the first embodiment of the present disclosure will be omitted. Hereinafter, the points different from the first embodiment of the bearing holding device according to the fourth embodiment will be described with reference to the drawings.

FIG. 14 is a perspective view of the bearing holding device 104 according to the fourth embodiment as viewed from the inner wall surface 204c side of the sheet metal frame 204.
FIG. 15 is a cross-sectional view showing the bearing holding device 104 according to the fourth embodiment.

As shown in FIG. 14, in the bearing holding device 104 according to the fourth embodiment, the sheet metal frame 204 has an inner wall surface 204c on the side where the bearing 4 is mounted and an outer wall surface 204d on the opposite side of the inner wall surface 204c in the thickness direction. .. The sheet metal frame 204 is formed with a bearing mounting hole 204a and a claw portion 204b extending axially from the outer wall surface 204d side of the sheet metal frame 204 on the circumferential surface 204e of the bearing mounting hole 204a. The bearing mounting hole 204a and the claw portion 204b are integrally molded by press working.

In contrast to the configuration in which the claw portions 2b of the bearing mounting hole 2a in the first embodiment are provided at a plurality of locations along the mounting hole edge portion 2f of the bearing mounting hole 2a at substantially equal intervals, in the fourth embodiment, the claws are provided. The portion 204b has a brim shape that is continuous along the mounting hole edge portion 204f on the circumferential surface 204e of the bearing mounting hole 204a. That is, the shape of the claw portion 204b is such that the outer circumference of the disk having a hole in the center is connected to the mounting hole edge portion 204f on the outer wall surface 204d side.
Since the claw portion 204b having a continuous brim shape has a large contact surface with the bearing 4, it is possible to reduce the stress generated in the claw portion 204b when a load is generated on the stepped shaft 3. Compared with the bearing holding device according to the first embodiment, the movement of the bearing 4 in the swing direction can be more strongly regulated, and the holding property can be improved.

Further, as shown in FIG. 15, the claw portion 204b is provided on the outer wall surface 204d side of the sheet metal frame 204 so as to be flush with the outer wall surface 204d. By providing the claw portion 204b and the outer wall surface 204d of the sheet metal frame 204 on the same plane, the claw portion 204b does not interfere with the parts arranged outside the sheet metal frame, so that the degree of freedom in designing the parts layout and the like is increased.
In the bearing holding device 104 according to the fourth embodiment, the configuration other than the sheet metal frame 204 is the same as the bearing holding device according to the first embodiment. Further, the aerial circuit breaker using the bearing holding device according to the fourth embodiment can be configured in the same manner as the aerial circuit breaker using the bearing holding device according to the first embodiment.

According to the bearing holding device according to the fourth embodiment, as in the first embodiment, even if the sheet metal frame is thinner than the axial thickness of the bearing, the bearing positioning and holding function can be performed without increasing the number of parts. As a result, the assembly man-hours can be reduced and the deterioration of assembly accuracy can be prevented.
Further, since the contact surface between the claw portion of the bearing mounting hole and the bearing is large, it is possible to reduce the stress generated in the claw portion when a load is generated on the stepped shaft. Compared with the bearing holding device according to the first embodiment, the movement of the bearing in the swing direction can be more strongly regulated, and the holding property can be improved.
According to the aerial circuit breaker using the bearing holding device according to the fourth embodiment, the weight of the product can be reduced and the assembly man-hours can be reduced by reducing the number of parts, the holding property for the bearing can be improved, and the weight and reliability of the product can be reduced. It is possible to improve the sex.

Embodiment 5.
The bearing holding device according to the fifth embodiment and the aerial circuit breaker using the bearing holding device will be described with reference to FIGS. 16 and 17.
In the fifth embodiment, the description of the same components or corresponding parts as those in the fourth embodiment of the present disclosure will be omitted. Hereinafter, the points different from the fourth embodiment of the bearing holding device according to the fifth embodiment will be described with reference to the drawings.

FIG. 16 is a perspective view showing the bearing holding device 105 according to the fifth embodiment. FIG. 17 is a cross-sectional view at the position of the alternate long and short dash line C shown in FIG.
As shown in FIGS. 16 and 17, in the bearing holding device 105, the sheet metal frame 205 has an inner wall surface 205c on the side where the bearing 4 is mounted and an outer wall surface 205d on the opposite side of the inner wall surface 205c in the thickness direction. The sheet metal frame 205 is formed with a bearing mounting hole 205a and a claw portion 205b extending in the axial direction from the outer wall surface 205d side of the sheet metal frame 205 on the circumferential surface 205e of the bearing mounting hole 205a. The claw portion 205b has a continuous brim shape along the mounting hole edge portion 205f. The bearing mounting hole 205a and the claw portion 205b are integrally molded by press working.

In contrast to the structure in which the claw portion 204b in the bearing holding device 104 according to the fourth embodiment and the outer wall surface 204d of the sheet metal frame 204 are flush with each other, in the fifth embodiment, the claw portion 205b is on the outer wall surface 205d side. The structure is such that the outer wall surface 205d projects outward. That is, the claw portion 205b has a shape that protrudes outward from the outer wall surface 205d and the outer periphery of the disk having a hole in the center is connected to the mounting hole edge portion 205f on the outer wall surface 205d side.

Due to the structure in which the claw portion 205b projects outward from the outer wall surface 205d of the sheet metal frame 205, the bearing 4 is mounted by shifting in the thrust direction toward the outer wall surface 205d of the sheet metal frame 205. That is, the contact surface between the outer ring 4a of the bearing 4 and the circumferential surface 205e of the bearing mounting hole 205a becomes large. As a result, when a load is generated on the stepped shaft 3, the stress generated on the sheet metal frame 205 and the bearing 4 can be reduced.

In the bearing holding device 105 according to the fifth embodiment, the configuration other than the sheet metal frame 205 is the same as the bearing holding device according to the fourth embodiment. Further, the aerial circuit breaker using the bearing holding device according to the fifth embodiment can be configured in the same manner as the aerial circuit breaker using the bearing holding device according to the fourth embodiment.

According to the bearing holding device according to the fifth embodiment, even if the sheet metal frame is thinner than the axial thickness of the bearing, the bearing can be positioned and held without increasing the number of parts, and the assembly man-hours can be reduced. It is possible to prevent deterioration of bearing accuracy.
Further, since the contact surface between the claw portion of the bearing mounting hole and the bearing is large, it is possible to reduce the stress generated in the claw portion when a load is generated on the stepped shaft. Compared with the bearing holding device according to the first embodiment, the movement of the bearing in the swing direction can be more strongly regulated, and the holding property can be improved.
In addition, since the claws have a structure that projects outward from the outer wall surface of the sheet metal frame, the contact surface between the bearing and the bearing mounting hole becomes large, and the stress generated between the sheet metal frame and the bearing can be reduced, resulting in a product life. Can be improved.
According to the aerial circuit breaker using the bearing holding device according to the fifth embodiment, it is possible to reduce the weight of the product and improve the reliability and the life of the product by reducing the number of parts.

Although the present disclosure describes various exemplary embodiments, the various features, embodiments, and functions described in one or more embodiments may be incorporated into the application of a particular embodiment. Not limited, it can be applied to embodiments alone or in various combinations. Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1, 102, 104, 105 Bearing holding device 2, 202, 203, 204, 205 Sheet metal frame 2a, 202a, 203a, 204a, 205a Bearing mounting holes 2b, 202b, 203b, 204b, 205b Claws 2c, 202c, 204c, 205c Inner wall surface 2d, 202d, 204d, 205d Outer wall surface 2e, 202e, 203e, 204e, 205e Circumferential surface 2f, 202f, 203f, 204f, 205f Mounting hole edge 3 Stepped shaft 3a Step 3b Small diameter 4 Bearing 4a Outer ring 4b Inner ring 4c Inner side surface 4d Outer side surface 21 Camshaft 28 Main shaft 100 Circuit breaker body 101 Housing 300 Air circuit breaker

Claims (9)

1. Bearings and
   A stepped shaft that is rotatably held by the bearing,
   A sheet metal frame having a thickness equal to or less than the axial thickness of the bearing and provided with a bearing mounting hole for mounting the bearing is provided.
   The bearing has an outer ring, an inner ring inside the outer ring, an inner surface surface facing the insertion direction of the stepped shaft, and an outer surface opposite the inner surface surface.
   The stepped shaft has a stepped portion at an end and a small diameter portion formed by reducing the diameter through the stepped portion, and the small diameter portion is reached until the stepped portion abuts on the inner ring on the inner side surface side of the bearing. The part is inserted into the inner ring,
   The sheet metal frame has an inner wall surface on the side where the bearing is mounted, and an outer wall surface on the opposite side of the inner wall surface in the thickness direction.
   The bearing mounting hole is a claw portion that extends in the axial direction from the mounting hole edge portion on the outer wall surface side and abuts on the outer ring on the outer surface side of the bearing on the circumferential surface of the bearing mounting hole. A bearing holding device characterized by having.
2. The sheet metal frames are a pair arranged so as to face each other.
   The bearing holding device according to claim 1, wherein the stepped shaft has a stepped portion and a small diameter portion at the end portions on both sides thereof.
3. The bearing holding device according to claim 1 or 2, wherein the bearing mounting hole and the claw portion are integrally molded.
4. The bearing holding device according to any one of claims 1 to 3, wherein the claw portion is provided at a plurality of locations along the mounting hole edge portion.
5. The bearing holding device according to claim 4, wherein a recess is formed at the root of the claw portion on the circumferential surface of the bearing mounting hole.
6. The bearing holding device according to any one of claims 1 to 3, wherein the claw portion has a continuous brim shape along the mounting hole edge portion.
7. The bearing holding device according to any one of claims 1 to 6, wherein the claw portion is provided on the outer wall surface side in the same plane as the outer wall surface.
8. The bearing holding device according to any one of claims 1 to 6, wherein the claw portion is provided so as to project outward from the outer wall surface on the outer wall surface side.
9. An aerial circuit breaker in which the bearing holding device according to any one of claims 1 to 8 is attached to the circuit breaker body.

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