JP7239058B2 - Bearing retainer and air circuit breaker with this bearing retainer - Google Patents

Description

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

In general, bearings are mounted in a housing that has a thickness equal to or greater than the thickness in the axial direction of the bearing, and support the shaft to achieve rotational motion.
On the other hand, in an air circuit breaker, the bearing holding device, which is used as a device that has the function of positioning and holding the bearing that rotatably supports the shaft in the opening/closing mechanism, is designed to reduce the thickness of the bearing in the axial direction to reduce the weight of the entire device. A thin sheet metal frame is used to hold the bearings. If it were attempted to insert the bearing directly into the sheet metal frame, it would be difficult to restrain the movement in the swinging direction of the shaft, making it difficult to provide the sheet metal frame with the bearing positioning and holding functions.
In conventional air circuit breakers, in order to suppress the swinging of the bearing shaft, the bearing is positioned and held by inserting the bearing into a jig that is sufficiently thicker than the sheet metal frame and then assembling it to the sheet metal frame. (See, for example, Patent Document 1).

Real Kaihei 5-69843

In the circuit breaker according to Patent Document 1, when assembling the bearing to the sheet metal frame (mechanical frame in Patent Document 1), a fixture for inserting and holding the bearing is essential, so the number of parts increases, resulting in increased product weight and assembly. There is a drawback that the number of man-hours has increased. In addition, as the number of assembly man-hours increases, there is a problem that the assembly accuracy deteriorates due to accumulation of tolerances.

The present disclosure has been made to solve the problems described above, and enables a sheet metal frame having a thin plate thickness compared to the axial thickness of a bearing to receive a load firmly without increasing the number of parts. To obtain a bearing holding device capable of reducing assembly man-hours and having a highly reliable bearing positioning and holding function.
Also, an air circuit breaker using this bearing holding device is obtained.

A 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 having 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 to the inner surface, and the stepped shaft has a The sheet metal frame has a stepped portion and a small diameter portion whose diameter is reduced through the stepped portion. 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. It has a claw portion that extends and abuts against the outer ring on the outer surface side of the bearing, and the claw portions are provided at a plurality of locations along the edge of the mounting hole .
Further, the air circuit breaker according to the present disclosure has the bearing holding device according to the present disclosure attached to the circuit breaker body.

According to the bearing holding device according to the present disclosure, even if the sheet metal frame is thinner than the thickness of the bearing in the axial direction, the bearing can be positioned and held without increasing the number of parts, and the number of assembly steps can be reduced. It is possible to prevent deterioration of accuracy.
Further, according to the air circuit breaker provided with the bearing holding device according to the present disclosure, it is possible to reduce the number of parts, thereby reducing the weight of the product and improving the reliability of the product.

1 is a perspective view of an air circuit breaker according to Embodiment 1 of the present disclosure; FIG. Fig. 2 is a partially cut perspective view of the drawer cradle in a state in which the circuit breaker body in the air circuit breaker according to the first embodiment of the present disclosure is pulled out from the drawer cradle; Fig. 2 is a partially cut perspective view of the drawer cradle in a state in which the circuit breaker body in the air circuit breaker according to the first embodiment of the present disclosure is inserted into the drawer cradle; FIG. 4 is a side cross-sectional view showing a tripped state in which the closing spring of the circuit breaker body in the air circuit breaker according to Embodiment 1 of the present disclosure is released; FIG. 3 is a side cross-sectional view showing an OFF state in which charging of the circuit breaker body in the air circuit breaker according to Embodiment 1 of the present disclosure is completed; FIG. 2 is a side cross-sectional view showing an ON state of the circuit breaker body in the air circuit breaker according to Embodiment 1 of the present disclosure; Fig. 2 is a front view of a main shaft in the air circuit breaker according to Embodiment 1 of the present disclosure; 1 is an exploded perspective view of a bearing holding device according to Embodiment 1 of the present disclosure; FIG. FIG. 4 is a side view of the outer wall surface side of the sheet metal frame of the bearing holding device according to Embodiment 1 of the present disclosure; 1 is a perspective view of a bearing holding device according to Embodiment 1 of the present disclosure; FIG. 1 is a cross-sectional view showing a bearing holding device according to Embodiment 1 of the present disclosure; FIG. FIG. 5 is a cross-sectional view showing a bearing holding device according to Embodiment 2 of the present disclosure; FIG. 11 is an enlarged perspective view of a bearing mounting hole of a sheet metal frame of a bearing holding device according to Embodiment 3 of the present disclosure; FIG. 11 is a perspective view showing a sheet metal frame in a bearing holding device according to Embodiment 4 of the present disclosure; FIG. 11 is a cross-sectional view showing a bearing holding device according to Embodiment 4 of the present disclosure; FIG. 11 is a perspective view of a bearing holding device according to Embodiment 5 of the present disclosure; FIG. 11 is a cross-sectional view showing a bearing holding device according to Embodiment 5 of the present disclosure;

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In addition, 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 air circuit breaker according to Embodiment 1, and FIG. 2 is a partially cut-out view of the drawer cradle with the circuit breaker main body of the air circuit breaker according to Embodiment 1 pulled out from the drawer cradle. 3 is a partially cut perspective view of the drawer cradle with the circuit breaker main body of the air circuit breaker according to the first embodiment inserted into the drawer cradle; FIG. Fig. 5 is a side cross-sectional view showing a tripped state in which the closing spring of the circuit breaker is released; 1 is a side cross-sectional view showing an ON state of the air circuit breaker according to FIG.

In FIG. 1, the air circuit breaker 300 is composed of a circuit breaker body 100 that opens and closes an electric circuit, and a drawer frame 200 that accommodates the circuit breaker body 100 in a drawable manner. The circuit breaker main body 100 is covered with a housing 101 consisting of a molded case 101a and a molded cover 101b, and a drawer mechanism 15 for drawing 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 of the housing 101, an ON button 11 for operating the charge arm 24 and closing the movable contactor 43 in the side cross-sectional view shown in FIG. 4 and a trip latch 31 in the side cross-sectional view shown in FIG. An OFF button 12 for pulling off the child 43 and a handle 13 for manually energizing 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 drawing out the circuit breaker body 100 is inserted is provided in the front of the drawer mechanism 15 .
The drawer frame 200 is provided with an extendable drawer rail 200a to which the circuit breaker body 100 is attached at one end.
As shown in FIG. 3, circuit breaker body 100 is inserted into drawer frame 200 . The circuit breaker body 100 is normally used while 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 ( not shown). The circuit breaker main body 100 moves in the direction of arrow E from the state shown in FIG. 3 and is pulled out from the drawer frame 200 to a predetermined position. Thereafter, the circuit breaker main body 100 is pulled out from the drawer frame 200 to obtain the drawn state shown in FIG.

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

Above the charging cam 22, there is a charging arm 24 that rotates about a fixed shaft 24a. By coming into contact, the charging cam 22 rotates 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 midsection of the charge arm 24, and as shown in FIGS. . The other end of the charge arm 24 is provided with a spring break pin 24d.

A guide plate 18 for holding the closing spring 17 is fixed to the housing 101 to the right of the charging cam 22, and the guide plate 18 has a long hole 18a. A spring hook pin 24d is passed through the long hole 18a so as to move along the long hole 18a.

A first close latch 25 is rotatably mounted on the fixed shaft 24a, and has a latch-side roller 25a in the midsection and two working surfaces formed on the end face on one end side. can engage with the cam-side roller 22a. One of the working surfaces is a restricting surface extending in the vertical direction at the right end of the first close latch 25 in FIG. It regulates The other working surface is a permissive surface extending obliquely downward to the left from the lower end of the restricting surface in FIG. is allowed to rotate. When the closing spring 17 starts accumulating the force, the cam-side roller 22a is engaged with the permissible surface as shown in FIG.

A second close latch 26 rotating around a fixed shaft 26a is provided above the first close latch 25, and the lower end of the second close latch 26 is engaged with a latch-side roller 25a. The upper end of the second close latch 26 is engaged with the close bar 27, which has a side projecting portion and a stepped engaging portion formed below, and a part of which is D-shaped. there is
Further, the second close latch 26 receives a counterclockwise force in FIG. 4 by a return spring (not shown). The closing 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 drawn state of the circuit breaker body 100 is provided inside the side surface of the drawer frame 200 . By rotating the closing plate 56 fixed to the closing bar 27 (shown in FIG. 4) through the rail detection lever 51, the shaft 53, the interlocking plate 54 and the push-up lever 55, the closing plate 56 is rotated as shown in FIG. The closing bar 27 shown is driven to release the closing spring 17 .

A main shaft 28, which will be described later, is rotatably supported by the sheet metal frame 2 (shown in FIG. 2) fixed to the housing 101. As shown in FIG.
As shown in FIG. 4, the closing toggle link mechanism 29 is constructed by connecting two links, a first link 29a and a second link 29b, by a central pin 29d, and the second link 29b side is connected to the main shaft by a pin 29c. 28 is connected to a second linking arm 28b (shown in FIG. 7).
A link-side roller 29e is rotatably supported around the center pin 29d, and is positioned to abut against the operating surface 24c when the closing toggle link mechanism 29 is in the bent state.

A link lever 30 rotatably supported by a 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 is provided rotatably on the middle portion of the link lever 30, and a trip latch 31 rotatably supported by the fixed shaft 26a is provided to the left of the lever-side roller 30c in FIG. there is The trip latch 31 has a side portion engaged with the lever-side roller 30c and an upper end portion engaged with a trip bar 32 having a D-cut shape. A directional rotational force is applied. The trip bar 32 is trip operated (rotated counterclockwise) manually by the OFF button 12 or by a solenoid or the like.

Next, the energizing operation of the closing spring 17 and the contact closing operation will be described. 4, in which the closing spring 17 is released, the handle 13 is manually pushed down in the direction of arrow D to rotate the ratchet 23 counterclockwise. When the cam 22 is rotated counterclockwise, the arm-side roller 24b supported on the left end of the charge arm rolls along the circumferential cam surface 22b, so that the arm-side roller 24b moves leftward in FIG. As a result, the charge arm 24 rotates clockwise around the fixed shaft 24a, and the spring catch pin 24d provided at the other end moves downward in FIG.

On the other hand, since the second close latch 26 receives a force in the counterclockwise direction by a return spring (not shown), the side protruding portion at the lower end of the second close latch 26 comes into contact with the latch side roller 25a. is pushed to the right to rotate the first close latch 25 clockwise, but the lower surface of the first close latch 25 on one end side, i.e., the allowable surface and the cam roller 22a are in contact with each other. As a result, the cam-side roller 22a serves as a stopper to hold the first close latch 25 in an unrotatable state.

When the closing spring 17 continues to accumulate energy and the charging cam 22 rotates further counterclockwise, the cam-side roller 22a separates from the lower surface of the first close latch 25 on the one end side, that is, the allowable surface. At this time, the first close latch 25 rotates clockwise, the latch-side roller 25a rotates clockwise, and is disengaged from the side projecting portion at the lower end of the second close latch 26, and the lower end of the second close latch 26 to 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 passes over the close bar 27 and moves to the left of the close bar 27, the first close latch 26 rotates counterclockwise. The latch-side roller 25a of the latch 25 engages with the engagement portion at the lower end of the second close latch 26 to stop the second close latch 26 from moving.
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 is achieved. It functions as a stop against any clockwise rotational force acting on the latch 26 .

The charging action of the closing spring 17 continues, and with the clockwise rotation of the charge arm 24, the operating surface 24c moves downward in FIG. The bending force of the closing toggle link mechanism 29 causes the link side roller 29e to follow the downward movement of the operating surface 24c and pull down the left link of the closing toggle link mechanism 29 in FIG. 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 passes over the trip bar 32 and moves to the right, the lever-side roller 30c is engaged with the concave portion (FIG. 5) of the trip latch 31, and the trip bar 32 is moved clockwise by a return spring (not shown). , and functions as a stopper against a counterclockwise rotational force acting on the trip latch 31 .

Since the closing toggle link mechanism 29 does not bend beyond the predetermined bending state, it assumes the state shown in FIG. When the handle 13 is pushed down several times, the charging cam 22 rotates almost once and finally reaches the state shown in FIG. , and the cam-side roller 22a comes into contact with the end surface of the first close latch 25, that is, the restricting surface, and stops.
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 of the closing spring 17 is completed.

In the state shown in FIG. 5, the release force of the closing spring 17 pushes the spring latch pin 24d upward, exerting a force on the charge arm 24 in the counterclockwise direction. 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 close latch 25, i.e., the restricting surface, in the counterclockwise direction. 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. The closing bar 27 serves as a stopper at the portion to prevent the clockwise rotation of the second closing latch 26 .

In this state, when the ON button 11 shown in FIG. 1 is pressed, the closing bar 27 is rotated clockwise to turn it on, and the locking of the upper end of the second closing latch 26 by the closing bar 27 is released. The closing latch 26 rotates clockwise, and the engagement between the lower end engaging portion and the latch side roller 25a is released.

As a result, the cam-side roller 22a rotates in the same direction while rotating the first closing latch 25 counterclockwise, and the charging cam 22 also rotates in the same direction. The arm-side roller 24b is dropped into the stepped portion of the circumferential cam surface 22b of the charging cam 22, and the releasing force of the closing spring 17 causes the charging arm 24 to rotate counterclockwise as shown in FIG. flips up the link side roller 29e of the closing toggle link mechanism 29.

As a result, the left link of the closing toggle link mechanism 29 moves upward and tries to rotate the link lever 30 clockwise. Since counterclockwise movement is locked, the closing toggle link mechanism 29 extends to the right to rotate 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 leftward by the pressing force of the contact pressure spring 45, imparting a clockwise rotational force to the link lever 30 via the pin 30b, and rotating the lever side roller 30c. Although the trip latch 31 is pressed counterclockwise through the trip bar 32, the trip latch 31 is prevented from rotating counterclockwise.

When the OFF button 12 shown in 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 acting force. The lever-side roller 30c is released from the concave portion of the link lever 30, 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 leftward to move the movable contact 43 leftward. When operated, the contacts 43a and 44a are turned off, and the state shown in FIG. 4 is restored. Thereafter, the above operation is repeated.

Next, taking the main shaft 28 as an example, the structure of the shaft, which is the rotating shaft of the opening/closing mechanism, will be described.
FIG. 7 is a front view of a main shaft 28, which is an example of a shaft in an air circuit breaker. As shown in FIG. 7, the main shaft 28 is fixed with an insulating link arm 28a and a second link arm 28b having the same shape as the insulating link arm 28a. 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 stepped portions 28c at both ends in the axial direction and small-diameter portions 28d formed to have a reduced diameter via the stepped portions 28c. A 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 air circuit breaker 300, shafts such as the main shaft 28 and the camshaft 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. It is

Next, the configuration of the bearing holding device, which is a device having the function of positioning and holding the bearing 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 Embodiment 1. As shown in FIG. 8(a) is an exploded perspective view of the bearing holding device 1, and FIG. 8(b) is an enlarged view of the portion indicated by the dashed line A in FIG. 8(a). FIG. 8(c) is an enlarged schematic view of the left bearing 4 in FIG. 8(a).
9 is a side view of the outer wall surface side of the sheet metal frame 2 of the bearing holding device 1. FIG.
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 dashed line B shown in FIG. 10. FIG.

A bearing holding device 1 according to Embodiment 1 has 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 2 a 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 is rotatable with very little resistance with respect to the outer ring 4a. Moreover, the bearing 4 has an inner side surface 4c facing the direction of insertion of the stepped shaft 3 and an outer side surface 4d opposite to the inner side surface 4c.

The sheet metal frames 2 have a thickness equal to or less than the thickness of the bearing 4 in the axial direction, are fixed to the housing 101, and are a pair arranged to face each other. The sheet metal frame 2 has an inner wall surface 2c on which the bearing 4 is attached and an outer wall surface 2d opposite to the inner wall surface 2c in the thickness direction. A bearing mounting hole 2 a passing through the sheet metal frame 2 has an inner diameter corresponding to the outer ring 4 a of the bearing 4 . A circumferential surface 2e of the bearing mounting hole 2a has a claw portion 2b extending axially from a mounting hole edge portion 2f on the side of the outer wall surface 2d. The pawl portion 2b abuts against the outer ring 4a on the side of the outer surface 4d of the bearing 4, holds the bearing 4, and restricts the outward movement of the bearing 4 from the pawl portion 2b.

The bearing mounting hole 2a and the claw portion 2b are integrally formed by pressing. As a result, the number of processing steps is not increased, and the strength of the claw portion 2b can be increased.
The stepped shaft 3 has a stepped portion 3a at both ends in the axial direction, and a small diameter portion 3b having a reduced diameter through the stepped portion 3a. The small-diameter portion 3b of the stepped shaft 3 is inserted into the inner ring 4b of the bearing 4 until the stepped portion 3a hits 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 3 b to the inner ring 4 b of the bearing 4 .

Here, the stepped shaft 3 is a representative shaft configuration example, corresponds to a shaft such as the main shaft 28, and has the function of a rotating shaft like the shaft such as the main shaft 28. The stepped portion 3 a of the stepped shaft 3 corresponds to the stepped portion 28 c of the main shaft 28 , and the small diameter portion 3 b of the stepped shaft 3 corresponds to the small diameter portion 28 d of the main shaft 28 .
For convenience of explanation, the charging cam, arm, etc. are not shown. The bearing retainer can be constructed in the same manner and has the same function when a charging cam, arm, etc. are attached to the stepped shaft.
For convenience of explanation, FIG. 8 shows a state in which the sheet metal frame 2 has only one bearing mounting hole for mounting a bearing. A bearing holding device having a plurality of bearing mounting holes in a single sheet metal frame can be constructed in the same manner and has the same function.

In Embodiment 1, the claw portions 2b are provided discontinuously at a plurality of locations along the mounting hole edge portion 2f of the bearing mounting hole 2a, and hold the outer ring 4a of the bearing 4 therebetween. The stability of holding the bearing 4 can be improved by providing them at a plurality of positions at approximately equal intervals along the mounting hole edge portion 2f of the bearing mounting hole 2a. FIG. 9 shows an example in which three claw portions 2b are provided 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, thereby restricting the movement of the bearing 4 in the radial direction. The outer ring 4a of the bearing 4 contacts the pawl portion 2b on the side of the outer wall surface 2d of the sheet metal frame 2, the inner ring 4b of the bearing 4 contacts the stepped portion 3a of the stepped shaft 3, and the bearing 4 contacts the pawl of the bearing mounting hole 2a. The movement of the bearing 4 in the thrust direction is restricted by being sandwiched together with the portion 2b and the stepped portion 3a of the stepped shaft 3. As shown in FIG. This serves the function of positioning and holding the bearing 4 .
The pawl portion 2b may have any shape as long as it can clamp the outer ring 4a of the bearing 4 and restrict the movement of the bearing 4 in the outward direction from the pawl portion 2b.

Further, as shown in FIG. 11, the claw portion 2b is provided so as to be flush with the outer wall surface 2d on the side of the outer wall surface 2d. The structure in which the claw portion 2b and the outer wall surface 2d are flush with each other prevents the claw portion 2b from interfering with parts arranged outside the sheet metal frame, thereby increasing the degree of freedom in designing the parts layout.

Since the thickness of the sheet metal frame 2 is equal to or less than 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 hits the pawl portion 2b. Only the portion that contacts the circumferential surface 2e of the bearing mounting hole 2a. That is, when the bearing 4 is mounted in the bearing mounting hole 2a, only a portion of the outer ring 4a is inscribed in the circumferential surface 2e of the bearing mounting hole 2a in the axial direction. A portion of the bearing 4 other than this portion is exposed to the outside from the inner wall surface 2c of the sheet metal frame 2 on the side where the claw portion 2b is not provided.

In the air circuit breaker according to Embodiment 1, 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 thickness of the bearing in the axial direction, the bearing positioning and holding functions can be achieved without increasing the number of parts, and the number of assembly man-hours can be reduced. Deterioration of assembly accuracy can be prevented.
According to the air circuit breaker provided with the bearing holding device according to Embodiment 1, it is possible to reduce the number of parts, thereby reducing the weight and improving the reliability of the product.

Embodiment 2.
A bearing holding device according to Embodiment 2 and an air circuit breaker using this bearing holding device will be described with reference to FIG.
In Embodiment 2, descriptions of the same components as those in Embodiment 1 of the present disclosure or corresponding portions will be omitted. Hereinafter, the points of the bearing holding device according to the second embodiment that are different from the first embodiment will be described with reference to the drawings.
FIG. 12 is a cross-sectional view of the bearing holding device 102 according to Embodiment 2 corresponding to the position of the dashed line B shown in FIG. 12 is a cross-sectional view of a bearing holding device 102 according to Embodiment 2, which corresponds to the case where claw portions are provided at three locations 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 which the bearing 4 is attached and an outer wall surface 202d opposite to the inner wall surface 202c in the thickness direction. On the circumferential surface 202e of the bearing mounting hole 202a, there is provided a claw portion 202b extending axially from the mounting hole edge portion 202f on the side of the outer wall surface 202d.
In contrast to the structure in which the pawl 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 pawl portion 202b extends from the outer wall surface 202d on the side of the outer wall surface 202d. The structure protrudes outward. Due to the structure in which the pawl portion 202b protrudes outward from the outer wall surface 202d of the sheet metal frame 202, the bearing 4 is attached by being shifted in the thrust direction toward the outer wall surface 202d of the sheet metal frame 202. As shown in FIG. 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 is increased. As a result, stress generated in the sheet metal frame 202 and the bearing 4 can be reduced when a load is generated on the stepped shaft 3 .

As in the first embodiment, in the second embodiment, the claw portions 202b are provided discontinuously at a plurality of locations along the mounting hole edge portion 202f of the bearing mounting hole 202a. The pawl portion 202b may have any shape as long as it can clamp the outer ring 4a of the bearing 4 and restrict the movement of the bearing 4 in the outward direction from the pawl portion 202b.
Further, the bearing mounting hole 202a and the claw portion 202b are integrally formed by pressing.

In addition, 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 that of the bearing holding device according to the first embodiment.
Also, an air circuit breaker using the bearing holding device according to the second embodiment can be configured in the same manner as the air 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 thickness of the bearing in the axial direction, the bearing positioning and holding functions can be performed without increasing the number of parts, and the number of assembly man-hours can be reduced. It is possible to prevent deterioration of attachment accuracy.
In addition, since the claw protrudes outward from the outer wall surface of the sheet metal frame, the contact surface between the bearing and the bearing mounting hole becomes large, reducing the stress generated in the sheet metal frame and the bearing and extending the product life. can be improved.
According to the air circuit breaker using the bearing holding device according to the second embodiment, it is possible to reduce the number of parts, reduce the weight of the product, and improve the reliability and life of the product.

Embodiment 3.
A bearing holding device according to Embodiment 3 and an air circuit breaker using this bearing holding device will be described with reference to FIG.
In Embodiment 3, descriptions of portions that are the same as or correspond to Embodiment 1 of the present disclosure are omitted. Hereinafter, with reference to the drawings, points of the bearing holding device according to Embodiment 3 that are different from Embodiment 1 will be described.

FIG. 13 is an enlarged perspective view of the bearing mounting hole 203a in the sheet metal frame 203 of the bearing holding device according to Embodiment 3 corresponding to the portion indicated by the dashed line A shown in FIG. 8(a).
As shown in FIG. 13, in the third embodiment, the sheet metal frame 203 extends axially from the mounting hole edge 203f on the outer wall side of the sheet metal frame 203 at the circumferential surface 203e of the bearing mounting hole 203a. It has a claw portion 203b and recesses 203g formed at both ends of the base of the claw portion 203b.

The bearing mounting hole 203a, the claw portion 203b and the recess 203g are integrally formed by two-stage press working. First, the bearing mounting hole 203a and the recess 203g are simultaneously formed by press working. Next, the claw portion 203b is formed by press working. By forming the depression 203g and the bearing mounting hole 203a at the same time as molding the claw portion 203b, the stress generated when molding the claw portion 203b can be concentrated on the depression 203g. Compared to the case where the depression 203g is not formed, deformation of the bearing mounting hole 203a due to stress generated around the claw portion 203b can be prevented.

In the third embodiment, the bearing 4 is sandwiched between the pawl portion 203b of the bearing mounting hole 203a and the stepped portion 3a of the stepped shaft 3. As shown in FIG. In addition, the stability of holding the bearing 4 can be improved by being provided at a plurality of locations at approximately equal intervals along the mounting hole edge portion 203f of the bearing mounting hole 203a.

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 Embodiment 3 will be described.
In the third embodiment, like the bearing holding device 1 according to the first embodiment, the pawl portion 203b can be provided flush with the outer wall surface of the sheet metal frame 203 . 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.

Moreover, like the bearing holding device 102 according to the second embodiment, the claw portion 203b can be provided so as to protrude 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 protrudes 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 similarly integrally formed by two-stage press working.

The structure of the bearing holding device according to the third embodiment is the same as that of the bearing holding device according to the first or second embodiment, except for the recess 203g formed at the base of the claw portion 203b of the sheet metal frame 203.
Also, an air circuit breaker using the bearing holding device according to the third embodiment can be configured similarly to the air circuit breaker using the bearing holding device according to the first embodiment.

According to the bearing holding device according to Embodiment 3, as in Embodiment 1, even if the sheet metal frame is thinner than the thickness of the bearing in the axial direction, the bearing positioning and holding functions can be performed without increasing the number of parts. As a result, the man-hours required for assembly can be reduced, and 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 air circuit breaker using the bearing holding device according to the third embodiment, it is possible to reduce the weight of the product and reduce the number of assembly man-hours by reducing the number of parts, prevent deformation of the bearing mounting hole, and reduce the weight and reliability of the product. can improve performance.

Embodiment 4.
A bearing holding device according to Embodiment 4 and an air circuit breaker using this bearing holding device will be described with reference to FIGS. 14 and 15. FIG.
In the fourth embodiment, descriptions of portions that are the same as or correspond to those of the first embodiment of the present disclosure are omitted. Hereinafter, with reference to the drawings, points of the bearing holding device according to the fourth embodiment that are different from the first embodiment will be described.

FIG. 14 is a perspective view of the sheet metal frame 204 in the bearing holding device 104 according to the fourth embodiment, viewed from the inner wall surface 204c side.
15 is a cross-sectional view showing a bearing holding device 104 according to Embodiment 4. FIG.

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 which the bearings 4 are attached and an outer wall surface 204d opposite to the inner wall surface 204c in the thickness direction. . The sheet metal frame 204 has a bearing mounting hole 204a and a claw portion 204b extending axially from the outer wall surface 204d of the sheet metal frame 204 at a 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 claw portions The portion 204b has a flange shape that continues along the mounting hole edge 204f on the circumferential surface 204e of the bearing mounting hole 204a. That is, the claw portion 204b has a shape in which the outer periphery of a disc with a hole in the center is connected to the mounting hole edge portion 204f on the side of the outer wall surface 204d.
The claw portion 204b, which has a continuous flange shape, has a large contact surface with the bearing 4, so that when a load is applied to the stepped shaft 3, the stress generated in the claw portion 204b can be reduced. Compared to the bearing holding device according to the first embodiment, the movement of the bearing 4 in the swinging direction can be more strongly restricted, and the holding performance can be improved.

Further, as shown in FIG. 15, the claw portion 204b is provided on the side of the outer wall surface 204d of the sheet metal frame 204 so as to be flush with the outer wall surface 204d. Since the claw portions 204b and the outer wall surface 204d of the sheet metal frame 204 are provided on the same plane, the claw portions 204b do not interfere with parts arranged outside the sheet metal frame, thereby increasing the degree of freedom in designing the parts layout.
In addition, in the bearing holding device 104 according to the fourth embodiment, the configuration other than the sheet metal frame 204 is the same as that of the bearing holding device according to the first embodiment. Also, an air circuit breaker using the bearing holding device according to the fourth embodiment can be configured in the same manner as the air 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 thickness of the bearing in the axial direction, the bearing positioning and holding functions can be performed without increasing the number of parts. As a result, the man-hours required for assembly can be reduced, and deterioration of assembly accuracy can be prevented.
Moreover, since the contact surface between the pawl portion of the bearing mounting hole and the bearing is large, the stress generated in the pawl portion when a load is applied to the stepped shaft can be reduced. Compared with the bearing holding device according to the first embodiment, it is possible to more strongly restrict the movement of the bearing in the swinging direction and improve the holding performance.
According to the air circuit breaker using the bearing holding device according to the fourth embodiment, it is possible to reduce the number of parts, reduce the weight of the product, reduce the number of assembly man-hours, improve the holding performance of the bearing, and reduce the weight and reliability of the product. can improve performance.

Embodiment 5.
A bearing holding device according to Embodiment 5 and an air circuit breaker using this bearing holding device will be described with reference to FIGS. 16 and 17. FIG.
In Embodiment 5, explanations of the same components as those in Embodiment 4 of the present disclosure or corresponding portions will be omitted. Hereinafter, the points of the bearing holding device according to Embodiment 5 that are different from those of Embodiment 4 will be described with reference to the drawings.

16 is a perspective view showing a bearing holding device 105 according to Embodiment 5. FIG. FIG. 17 is a cross-sectional view at the position of the dashed-dotted 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 which the bearing 4 is mounted and an outer wall surface 205d opposite to the inner wall surface 205c in the thickness direction. The sheet metal frame 205 has a bearing mounting hole 205a and a claw portion 205b extending axially from the outer wall surface 205d of the sheet metal frame 205 at a circumferential surface 205e of the bearing mounting hole 205a. The claw portion 205b has a flange shape that continues along the mounting hole edge portion 205f. The bearing mounting hole 205a and the claw portion 205b are integrally formed by press working.

In contrast to the structure in which the claw portion 204b and the outer wall surface 204d of the sheet metal frame 204 are flush with each other in the bearing holding device 104 according to the fourth embodiment, in the fifth embodiment, the claw portion 205b is located on the outer wall surface 205d side. , the structure protrudes outward from the outer wall surface 205d. That is, the claw portion 205b protrudes outward from the outer wall surface 205d, and has a shape in which the outer periphery of a disk with 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 protrudes outward from the outer wall surface 205d of the sheet metal frame 205, the bearing 4 is attached by being shifted toward the outer wall surface 205d side of the sheet metal frame 205 in the thrust direction. 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 is increased. As a result, stress generated in the sheet metal frame 205 and the bearing 4 can be reduced when a load is generated on the stepped shaft 3 .

In addition, in the bearing holding device 105 according to the fifth embodiment, the configuration other than the sheet metal frame 205 is the same as that of the bearing holding device according to the fourth embodiment. Also, an air circuit breaker using the bearing holding device according to the fifth embodiment can be configured in the same manner as the air 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 thickness of the bearing in the axial direction, the bearing positioning and holding functions can be performed without increasing the number of parts, and the number of assembly man-hours can be reduced. It is possible to prevent deterioration of attachment accuracy.
Moreover, since the contact surface between the pawl portion of the bearing mounting hole and the bearing is large, the stress generated in the pawl portion when a load is applied to the stepped shaft can be reduced. Compared with the bearing holding device according to the first embodiment, it is possible to more strongly restrict the movement of the bearing in the swinging direction and improve the holding performance.
In addition, since the claw protrudes outward from the outer wall surface of the sheet metal frame, the contact surface between the bearing and the bearing mounting hole becomes large, reducing the stress generated in the sheet metal frame and the bearing and extending the product life. can be improved.
According to the air circuit breaker using the bearing holding device according to the fifth embodiment, it is possible to reduce the number of parts, reduce the weight of the product, and improve the reliability and life of the product.

While the present disclosure describes various exemplary embodiments, various features, aspects, and functions described in one or more embodiments may be applied to particular embodiments. The embodiments are applicable singly or in various combinations without limitation. Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

1, 102, 104, 105 bearing holding devices 2, 202, 203, 204, 205 sheet metal frames 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 stepped portion 3b small diameter portion 4 bearing 4a Outer ring 4b Inner ring 4c Inner surface 4d Outer surface 21 Camshaft 28 Main shaft 100 Circuit breaker body 101 Housing 300 Air circuit breaker

Claims (7)

a bearing;
a stepped shaft 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, the bearing comprising an outer ring, an inner ring inside the outer ring, and the stepped shaft. having an inner surface facing the insertion direction and an outer surface opposite to the inner surface;
The stepped shaft has a stepped portion at its end and a small diameter portion whose diameter is reduced through the stepped portion. is inserted into the inner ring,
The sheet metal frame has an inner wall surface on the bearing mounting side and an outer wall surface opposite to the inner wall surface in the thickness direction,
The bearing mounting hole has a pawl portion extending in the axial direction from the mounting hole edge on the outer wall surface side on the circumferential surface of the bearing mounting hole and abutting on the outer ring on the outer surface side of the bearing. has
The bearing holding device , wherein the claw portions are provided at a plurality of locations along the edge portion of the mounting hole . 2. A bearing holding device according to claim 1 , wherein a recess is formed at the base of said claw portion on the circumferential surface of said bearing mounting hole . 3. The apparatus according to claim 1, wherein said sheet metal frames are a pair arranged to face each other, and said stepped shaft has said stepped portion and said small diameter portion at said end portions on both sides, respectively. A bearing retainer as described. 4. A bearing holding device according to claim 1 , wherein said bearing mounting hole and said claw portion are integrally molded . 5. The bearing holding device according to claim 1, wherein the claw portion is provided on the same plane as the outer wall surface on the side of the outer wall surface . The bearing holding device according to any one of claims 1 to 5, wherein the claw portion is provided on the outer wall surface side so as to protrude outward from the outer wall surface . An air circuit breaker in which the bearing holding device according to any one of claims 1 to 6 is attached to the circuit breaker body.

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