CN115280451A - Bearing holding device and air circuit breaker with same - Google Patents

Abstract

Provided is a bearing holding device capable of holding a bearing without increasing the number of components even in a sheet metal frame having a thickness smaller than the axial direction of the bearing. A bearing holding device (1) according to the present invention comprises: a bearing (4); a stepped shaft (3) rotatably held by the bearing (4); and a sheet metal frame (2) having a thickness less than or equal to the axial thickness of the bearing (4), the sheet metal frame being provided with a bearing mounting hole (2 a) for mounting the bearing (4), the bearing (4) having an outer ring (4 b) and an inner ring (4 a), the stepped shaft (3) having, at an end portion thereof, a step portion (3 a) and a small diameter portion (3 b) formed by reducing the diameter thereof with the step portion (3 a) interposed therebetween, the small diameter portion (3 b) being inserted into the inner ring (4 a) until the step portion (3 a) comes into contact with the inner ring (4 a) on the inner side surface (4 c) side of the bearing (4), and a circumferential surface (2 e) of the bearing mounting hole (2 a) having a claw portion (2 b) extending in the axial direction from a mounting hole edge portion (2 f) on the outer wall surface (2 d) side of the sheet metal frame (2) and coming into contact with the outer ring (4 a) on the outer side surface (4 d) of the bearing (4).

Description

Bearing holding device and air circuit breaker with same

Technical Field

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

Background

In general, a bearing is assembled in a housing having a thickness equal to or greater than the axial thickness of the bearing, and the bearing supports a shaft to realize a rotational motion.

On the other hand, in the air circuit breaker, as a bearing holding device used as a device having a function of positioning and holding a bearing for rotatably supporting a shaft in an opening/closing mechanism, a sheet metal frame having a plate thickness smaller than an axial thickness of the bearing is used for holding the bearing in order to reduce the weight of the entire device. If an attempt is made to insert the bearing directly into the sheet metal frame, it is difficult to restrict the movement with respect to the swinging direction of the shaft, and therefore it is difficult to provide the sheet metal frame with the positioning and holding function of the bearing.

In a conventional air circuit breaker, in order to suppress the swing of a bearing shaft, a bearing is inserted into a support portion having a sufficient thickness than a sheet metal frame and then assembled to the sheet metal frame, thereby positioning and holding the bearing (see, for example, patent document 1).

Patent document 1: japanese Kaikiping 5-69843

Disclosure of Invention

In the circuit breaker according to patent document 1, when the bearing is assembled to the sheet metal frame (the mechanism frame in patent document 1), the support portion into which the bearing is inserted and held is necessary, and therefore, there is a disadvantage in that the number of components increases, and the product weight and the number of assembly steps increase. Further, there is a problem that the assembling accuracy is deteriorated due to the accumulation of the tolerance with the increase of the assembling man-hour.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a bearing holding device having a function of positioning and holding a bearing with high reliability, which can stably receive a load without increasing the number of components, can reduce the number of assembly steps, and can reduce the thickness of a bearing in the axial direction, with respect to a sheet metal frame having a small thickness compared to the thickness of the bearing in the axial direction.

Further, an air circuit breaker using the bearing holding device is obtained.

The bearing holding device according to the present invention includes: a bearing; a stepped shaft rotatably held by the bearing; and a sheet metal frame having a thickness less than or equal to a thickness of the bearing in an axial direction, and provided with a bearing mounting hole for mounting the bearing, the bearing including an outer ring, an inner ring inside the outer ring, an inner surface facing an insertion direction of the stepped shaft, and an outer surface opposite to the inner surface, the stepped shaft having a step portion at an end portion and a small diameter portion formed by reducing the diameter of the stepped shaft with the step portion interposed therebetween, the small diameter portion being inserted into the inner ring until the step portion abuts against the inner ring on an inner surface side of the bearing, the sheet metal frame having an inner wall surface on a side where the bearing is mounted and an outer wall surface opposite to the inner wall surface in the thickness direction, the bearing mounting hole having, on a circumferential surface of the bearing mounting hole, a claw portion extending in the axial direction from an edge portion of the mounting hole on the outer wall surface side and abutting against the outer ring on the outer surface side of the bearing.

In the air circuit breaker according to the present invention, the bearing holding device according to the present invention is mounted on the breaker main body.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the bearing holding device of the present invention, even if the metal plate frame is thinner than the thickness of the bearing in the axial direction, the positioning and holding functions of the bearing can be realized without increasing the number of components, the number of assembly steps can be reduced, and the deterioration of the assembly accuracy can be prevented.

Further, according to the air circuit breaker including the bearing holding device according to the present invention, it is possible to reduce the weight of the product and improve the reliability of the product by reducing the number of components.

Drawings

Fig. 1 is a perspective view of an air circuit breaker according to embodiment 1 of the present invention.

Fig. 2 is a perspective view of the air circuit breaker according to embodiment 1 of the present invention, in which a part of the drawer frame is cut away in a state where the breaker main body is pulled out from the drawer frame.

Fig. 3 is a perspective view of a pull-out frame in which a circuit breaker main body in an air circuit breaker according to embodiment 1 of the present invention is inserted into the pull-out frame, with a portion of the pull-out frame being cut away.

Fig. 4 is a side cross-sectional view showing a released state of a closing spring of a breaker main body in an air circuit breaker according to embodiment 1 of the present invention.

Fig. 5 is a side cross-sectional view showing an off state in which charging of the breaker main body is completed in the air circuit breaker according to embodiment 1 of the present invention.

Fig. 6 is a side sectional view showing an on state of a breaker main body in the air circuit breaker according to embodiment 1 of the present invention.

Fig. 7 is a front view of a main shaft in an air circuit breaker according to embodiment 1 of the present invention.

Fig. 8 is an exploded perspective view of a bearing holding device according to embodiment 1 of the present invention.

Fig. 9 is a side view of the sheet metal frame of the bearing holding device according to embodiment 1 of the present invention on the outer wall surface side.

Fig. 10 is a perspective view of a bearing holding device according to embodiment 1 of the present invention.

Fig. 11 is a sectional view showing a bearing holding device according to embodiment 1 of the present invention.

Fig. 12 is a sectional view showing a bearing holding device according to embodiment 2 of the present invention.

Fig. 13 is an enlarged oblique view of a bearing mounting hole of a sheet metal frame of a bearing holding device according to embodiment 3 of the present invention.

Fig. 14 is a perspective view showing a sheet metal frame in a bearing holding device according to embodiment 4 of the present invention.

Fig. 15 is a sectional view showing a bearing holding device according to embodiment 4 of the present invention.

Fig. 16 is a perspective view of a bearing holding device according to embodiment 5 of the present invention.

Fig. 17 is a sectional view showing a bearing holding device according to embodiment 5 of the present invention.

Detailed Description

Embodiments according to the present invention will be described below with reference to the drawings. In the following embodiments, the same components are denoted by the same reference numerals.

Embodiment 1.

Fig. 1 is a perspective view of an air circuit breaker according to embodiment 1, fig. 2 is a perspective view of a portion of a pull-out frame in a state where a breaker main body of the air circuit breaker according to embodiment 1 is pulled out from the pull-out frame, fig. 3 is a perspective view of a portion of a pull-out frame in a state where a breaker main body of the air circuit breaker according to embodiment 1 is inserted into the pull-out frame, fig. 4 is a side sectional view showing a released state in which a closing spring of the air circuit breaker according to embodiment 1 is released, fig. 5 is a side sectional view showing a charged off state of the air circuit breaker according to embodiment 1, and fig. 6 is a side sectional view showing an on state of the air circuit breaker according to embodiment 1.

In fig. 1, the air circuit breaker 300 includes a breaker main body 100 for opening and closing an electric circuit and a draw-out frame 200 for storing the breaker main body 100 in a drawable manner. The breaker main body 100 is covered with a housing 101 including a mold case 101a and a mold cover 101b, and a pull-out mechanism 15 for pulling out the breaker main body 100 from the pull-out frame 200 is provided at a lower portion of the housing 101. The front surface of the housing 101 is provided with: an ON button 11 that operates the charging arm 24 in the side cross-sectional view shown in fig. 4 and closes the movable contact 43; an OFF button 12 that operates the trip latch 31 in the side cross-sectional view shown in fig. 4 to trip the movable contact 43; and a handle 13 that manually charges a closing spring 17 in the side sectional view shown in fig. 4.

An insertion hole 14 is provided in a front surface of the drawer mechanism 15, and a drawer handle (not shown) used when the breaker main body 100 is pulled out is inserted into the insertion hole 14.

The drawer frame 200 is provided with a retractable drawer rail 200a to which the breaker main body 100 is attached at one end.

As shown in fig. 3, the breaker body 100 is inserted into the draw-out frame 200. Generally, the breaker main body 100 is used in a state of being inserted into the draw-out frame 200.

When the breaker main body 100 needs to be pulled out from the pull-out frame 200 in accordance with maintenance of the breaker main body 100 or the like, a pull-out handle (not shown) inserted from the insertion hole 14 is rotated from an inserted state of the breaker main body 100 shown in fig. 3. From the state of fig. 3, the breaker main body 100 moves in the arrow E direction and is pulled out from the pull-out frame 200 to a predetermined position. Then, the breaker main body 100 is pulled out from the pull-out frame 200, thereby bringing the breaker main body into the pulled-out state shown in fig. 1.

Next, the opening and closing mechanism of the breaker main body 100 will be explained.

As shown in fig. 4, 5, and 6, the housing 101 is composed of a mold case 101a and a mold cover 101 b. The cam shaft 21 is rotatably supported by the sheet metal frame 2 (shown in fig. 2) in the housing 101. The cam shaft 21 is used as a shaft to fix the charging cam 22 and the ratchet wheel 23, a cam side roller 22a is provided between the charging cam 22 and the ratchet wheel 23, and the outer periphery of the charging cam 22 is a circumferential cam surface 22b.

Above the charging cam 22, there is a charging arm 24 that rotates about a fixed shaft 24a as a fulcrum, and an arm-side roller 24b is provided at one end of the charging arm 24, and the charging cam 22 is rotated together with the charging arm 24 about the fixed shaft 24a as a fulcrum by rolling contact of a circumferential cam surface 22b of the charging cam 22. As shown in fig. 4, 5, and 6, the upper surface of the middle abdominal portion of the charging arm 24 has a working surface 24c having a shape in which the radius of curvature changes toward the right in the drawing. A spring hook pin 24d is provided at the other end of the charging arm 24.

On the right side of the charging cam 22, a guide plate 18 that holds the brake spring 17 is fixed to the housing 101, and the guide plate 18 has a long hole 18a. The spring hook pin 24d penetrates the long hole 18a so as to be movable along the long hole 18a, and moves along the long hole 18a to charge the closing spring 17.

The 1 st closing latch 25 is rotatably mounted on the fixed shaft 24a at the fixed shaft 24a, and has a latch-side roller 25a in the middle abdominal part, and 2 action surfaces formed on the end surface at one end side, which can be engaged with the cam-side roller 22 a. One of the acting surfaces is a regulating surface extending in the up-down direction at the right end in fig. 4 of the 1 st closing latch 25, and when the cam-side roller 22a abuts against the regulating surface, further rotation of the charging cam 22 is regulated. The other 1 of the working surfaces is a permissible surface extending obliquely downward to the left from the lower end of the regulating surface in fig. 4, and when the cam-side roller 22a abuts against the surface, the counterclockwise rotation of the charging cam 22 is permitted. When the charging of the closing spring 17 is started, the cam side roller 22a engages with the allowable surface as shown in fig. 5.

A 2 nd closing latch 26 that rotates about a fixed shaft 26a is provided above the 1 st closing latch 25, and a latch-side roller 25a engages with a lower end of the 2 nd closing latch 26. The 2 nd closing latch 26 has a side protruding portion and a step-shaped engaging portion formed below the side protruding portion, and an upper end portion thereof is engaged with a closing lever 27 having a D-cut shape.

The 2 nd closing latch 26 is urged counterclockwise in fig. 4 by a return spring not shown. The closing lever 27 is manually operated by the ON button 11 or is turned ON (rotated clockwise) by a solenoid or the like.

As shown in fig. 2, a rail detection lever 51 for detecting a pulled-out state of the breaker main body 100 is provided on the inner side of the side surface of the pull-out frame 200. The closing plate 56 is rotated by the closing plate 56 fixed to the closing lever 27 (shown in fig. 4) via the track detecting lever 51, the shaft 53, the interlocking plate 54, and the pushing-up lever 55, whereby the closing lever 27 shown in fig. 4 is driven to release the closing spring 17.

A later-described main shaft 28 is rotatably supported by the sheet metal frame 2 (shown in fig. 2) fixed to the housing 101.

As shown in fig. 4, the closing toggle link mechanism 29 is configured such that 2 links, i.e., the 1 st link 29a and the 2 nd link 29b, are coupled by a center pin 29d, and the 2 nd link 29b side is coupled by a pin 29c to a 2 nd link arm 28b (shown in fig. 7) fixed to the main shaft 28.

A link-side roller 29e is rotatably supported around the center pin 29d, and is in a positional relationship of abutting against the working surface 24c when the closing toggle 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 1 st link 29a side of the closing toggle link mechanism 29 is connected to one end side by a pin 30 b. A lever-side roller 30c is rotatably provided in the middle belly portion of the link lever 30, and a release latch 31 rotatably supported on the fixed shaft 26a is provided on the left side of the lever-side roller 30c in fig. 4. The side surface portion of the latch 31 is engaged with the lever-side roller 30c, and the upper end portion is engaged with a trip lever 32 having a partially D-cut shape, and a clockwise rotational force is applied by a return spring not shown in fig. 4. The trip lever 32 is manually operated by the OFF button 12 or is tripped (rotated counterclockwise) by a solenoid or the like.

Next, the charging operation of the switching spring 17 and the contact closing operation will be described. In the tripped state shown in fig. 4 in which the closing spring 17 is released, if the handle 13 is manually pushed in the direction of arrow D to rotate the ratchet wheel 23 in the counterclockwise direction and rotate the charging cam 22 coaxially fixed to the cam shaft 21 in the counterclockwise direction, the arm side roller 24b supported at the left end of the charging arm rotates along the circumferential cam surface 22b, and therefore the arm side roller 24b moves in the left direction in fig. 5, and as a result, the charging arm 24 rotates in the clockwise direction about the fixed shaft 24a, and the spring hooking pin 24D provided at the other end moves in the downward direction in fig. 4 to store energy in the closing spring 17.

On the other hand, since the 2 nd closing latch 26 receives a counterclockwise force by a return spring not shown, the side surface projection at the lower end of the 2 nd closing latch 26 abuts on the latch-side roller 25a, and is pressed rightward in fig. 5, and the 1 st closing latch 25 tries to rotate clockwise, but the lower surface at one end side of the 1 st closing latch 25, that is, the allowable surface and the cam-side roller 22a are in an abutting state, and therefore the cam-side roller 22a becomes a stopper and the 1 st closing latch 25 is held in a non-rotatable state.

After the charging operation of the closing spring 17, if the charging cam 22 further rotates counterclockwise, the cam side roller 22a is separated from the lower surface of the 1 st closing latch 25 on the one end side, i.e., the allowable surface. At this time, the 1 st closing latch 25 rotates in the clockwise direction, and the latch-side roller 25a rotates in the clockwise direction to be disengaged from the side projection of the lower end of the 2 nd closing latch 26, thereby freeing the lower end of the 2 nd closing latch 26.

As a result, the 2 nd close latch 26 is rotated counterclockwise by the return spring, the upper end of the 2 nd close latch 26 goes beyond the close lever 27, and when moving to the left of the close lever 27, the latch-side roller 25a of the 1 st close latch 25 engages with the engaging portion of the lower end of the 2 nd close latch 26, and the movement of the 2 nd close latch 26 is prevented.

At this time, at the upper end portion of the 2 nd closing latch 26, the closing lever 27 is rotated counterclockwise by a return spring (not shown) to be in the 2 nd state (the state of the closing lever 27 in fig. 6), and even if a clockwise rotational force acts on the 2 nd closing latch 26, it acts as a stopper against the clockwise rotational force.

After the charging operation of the closing spring 17, the clockwise rotation of the charging arm 24 moves the working surface 24c downward in fig. 5, and tries to separate from the link-side roller 29e of the closing toggle link mechanism 29. The link-side roller 29e follows the downward movement of the working surface 24c by the bending force of the closing toggle link mechanism 29, and the left link of the closing toggle link mechanism 29 is pulled down in fig. 5. Therefore, the pin 30b at the other end of the closing toggle mechanism 29 moves downward, and the link lever 30 rotates counterclockwise, and the lever-side roller 30c also rotates counterclockwise.

As a result, the trip latch 31 is rotated in the clockwise direction by the return spring. When the trip latch 31 moves to the right beyond the trip lever 32, the lever side roller 30c engages with a recess (fig. 5) of the trip latch 31, and the trip lever 32 rotates clockwise by a return spring (not shown), and even if a counterclockwise rotational force acts on the trip latch 31, it functions as a stopper against the rotational force.

The closing toggle link mechanism 29 is not bent at a predetermined bent state or more, and thus becomes the state of fig. 5. The charging cam 22 is rotated approximately 1 rotation by a few times of pressing operation of the handle 13, and finally, the state of fig. 5 is reached, that is, the arm side roller 24b of the charging arm 24 reaches a position slightly near the maximum radius of the charging cam 22, and the cam side roller 22a comes into contact with the restricting surface, which is the end surface of the 1 st closing latch 25, again, and comes to a stop state.

Then, even if the handle 13 is further pressed, the ratchet wheel 23 only idles, the charging cam 22 does not rotate, and the stored energy of the closing spring 17 is completed.

In the state of fig. 5, the spring hooking pin 24d is pressed upward by the releasing force of the closing spring 17, and a counterclockwise force acts on the charging arm 24. Since this force is transmitted to the charging cam 22 via the arm-side roller 24b, the cam-side roller 22a presses the restricting surface, which is the end surface of the 1 st closing latch 25, in the counterclockwise direction, and as a result, the latch-side roller 25a of the 1 st closing latch 25 presses the lower end engaging portion of the 2 nd closing latch 26 in the left direction to attempt to rotate the 2 nd closing latch 26 in the clockwise direction, but the closing lever 27 at the upper end portion of the 2 nd closing latch 26 serves as a stopper to prevent the clockwise rotation of the 2 nd closing latch 26.

In this state, if the ON button 11 of fig. 1 is pressed, the closing lever 27 is rotated clockwise to perform an ON operation, and the locking of the upper end of the 2 nd closing latch 26 by the closing lever 27 is released, so that the 2 nd closing latch 26 rotates clockwise, and the engagement of the lower end engagement portion thereof with the latch-side roller 25a is disengaged.

As a result, the cam-side roller 22a rotates the 1 st close latch 25 in the counterclockwise direction and in the same direction, and the charging cam 22 also rotates in the same direction, so that the arm-side roller 24b supported at the left end of the charging arm 24 falls on the step portion of the circumferential cam surface 22b of the charging cam 22, the charging arm 24 rotates in the counterclockwise direction as shown in fig. 6 by the releasing force of the closing spring 17, and the link-side roller 29e of the closing toggle link mechanism 29 is lifted by the operating surface 24c thereof.

Therefore, the left link of the closing toggle link mechanism 29 moves upward to rotate the link lever 30 clockwise, but the lever side roller 30c abuts on the trip latch 31, and the trip latch 31 is locked by the trip lever 32 from operating counterclockwise, so that the closing toggle link mechanism 29 extends rightward, and the contact point 43a and the contact point 44a provided on the conductor 44 are turned on to move the movable contact 43 rightward as shown in fig. 6 by rotating the 2 nd link arm 28b counterclockwise.

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

In this state, if the OFF button 12 of fig. 1 is pressed, the trip lever 32 rotates counterclockwise to perform a trip operation, and the trip latch 31 rotates counterclockwise by the above-mentioned urging force, so that the lever side roller 30c is disengaged from the recess of the trip latch 31, 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 leftward along the working surface 24c of the charging arm 24, and the pin 29c drives the insulating link 41 leftward to move the movable contact 43 leftward, so that the contacts 43a and 44a are opened, and the state returns to fig. 4. Then, the above-described operation is repeated.

Next, a structure of a shaft as a rotation shaft of the opening and closing mechanism will be described by taking the main shaft 28 as an example.

Fig. 7 is a front view of a main shaft 28 which is one example of a shaft in the air circuit breaker. As shown in fig. 7, an insulating link arm 28a and a 2 nd 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 2 nd link arm 28b are provided with a pin 42 and a pin 29c for driving the links, respectively.

The main shaft 28 is a stepped shaft having a stepped portion 28c and a small diameter portion 28d formed by reducing the diameter thereof with the stepped portion 28c interposed therebetween at both axial ends. 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 air circuit breaker 300, as a part of the components of the opening and closing mechanism, the shafts of the main shaft 28, the cam shaft 21, and the like are rotatably supported by bearings attached to the sheet metal frame 2 fixed to the housing 101.

Next, a structure of a bearing holding device, which is a device having a function of positioning and holding a bearing attached to the housing 101 of the breaker main body 100, will be described.

Fig. 8 is a diagram showing the structure of the bearing holding device 1 according to embodiment 1. Fig. 8 (a) is an exploded oblique view of the bearing holding device 1, and fig. 8 (b) is an enlarged view of a portion shown by a chain line a in fig. 8 (a). Fig. 8 (c) is an enlarged schematic view of the left bearing 4 in fig. 8 (a).

Fig. 9 is a side view of the outer wall surface side of the sheet metal frame 2 of the bearing holding device 1.

Fig. 10 is a perspective view showing the bearing holding device 1.

Fig. 11 is a sectional view of the bearing holding device 1 at the position of the chain line B shown in fig. 10.

A bearing holding device 1 according to embodiment 1 includes: a bearing 4; a stepped shaft 3 rotatably held by a 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 4 a. The inner ring 4b is rotatable with little resistance relative to the outer ring 4 a. The bearing 4 has an inner surface 4c facing the insertion direction of the stepped shaft 3 and an outer surface 4d opposite to the inner surface 4 c.

The sheet metal frames 2 have a thickness equal to or less than the axial thickness of the bearings 4, are fixed to the housing 101, and are a pair of oppositely disposed members. The sheet metal frame 2 has an inner wall surface 2c on the side where the bearing 4 is attached and an outer wall surface 2d on the opposite side of the inner wall surface 2c in the thickness direction. The inside diameter of a bearing mounting hole 2a through which the sheet metal frame 2 passes corresponds 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 portions 2b abut against the outer ring 4a on the outer side surface 4d side of the bearing 4 to hold the bearing 4, and the claw portions 2b regulate the outward movement of the bearing 4.

The bearing attachment hole 2a and the claw portion 2b are integrally formed by press working. This can increase the strength of the claw portion 2b without increasing the number of machining steps.

The stepped shaft 3 has a stepped portion 3a and a small diameter portion 3b formed by reducing the diameter of the stepped portion 3a at both ends in the axial direction. The stepped shaft 3 is inserted into the inner ring 4b of the bearing 4 until the step portion 3a abuts against the inner ring 4b on the inner surface 4c side of the bearing 4. The small diameter portion 3b of the stepped shaft 3 is fixed to the inner ring 4b of the bearing 4, and is rotatably held thereby.

Here, the stepped shaft 3 corresponds to a shaft such as the main shaft 28 as a representative shaft configuration example, and functions as a rotating shaft in the same manner as the 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, a charging cam, an arm, and the like are not shown. The bearing holding device can be configured similarly even when a charging cam, an arm, or the like is attached to the stepped shaft, and has the same function.

For convenience of explanation, fig. 8 illustrates a state in which only 1 bearing mounting hole for mounting a bearing is provided in the sheet metal frame 2. The bearing holding device can be configured similarly even when a plurality of bearing mounting holes are mounted to one sheet metal frame, and has the same function.

In embodiment 1, the claw portions 2b are provided discontinuously at a plurality of positions along the mounting hole edge portion 2f of the bearing mounting hole 2a, and sandwich the outer ring 4a of the bearing 4. The bearings 4 can be held more stably by being provided at a plurality of positions substantially at equal intervals along the mounting hole edge portions 2f of the bearing mounting holes 2a. Fig. 9 shows an example in which the claw portions 2b are provided at 3 locations along the mounting hole edge portion 2 f.

As shown in fig. 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 abuts the claw 2b on the outer wall surface 2d side of the sheet metal frame 2, the inner ring 4b of the bearing 4 abuts the step 3a of the stepped shaft 3, and the bearing 4 is sandwiched between the claw 2b of the bearing mounting hole 2a and the step 3a of the stepped shaft 3, thereby restricting the movement of the bearing 4 in the thrust direction. Thereby achieving the positioning and retaining function of the bearing 4.

The claw portion 2b holds the outer ring 4a of the bearing 4, and is not limited to a shape as long as movement of the bearing 4 in the outward direction of the claw portion 2b can be restricted.

As shown in fig. 11, the claw portion 2b is flush with the outer wall surface 2d on the outer wall surface 2d side. Due to the structure in which the claw portions 2b and the outer wall surface 2d are flush with each other, the claw portions 2b do not interfere with members arranged outside the sheet metal frame, and thus the degree of freedom in designing the layout of the members and the like is increased.

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, when the bearing 4 is mounted in the bearing mounting hole 2a until the outer ring 4a abuts against the claw portion 2b, only the portion of the bearing 4 inserted into the bearing mounting hole 2a is 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 the portion is exposed outward from the inner wall surface 2c of the sheet metal frame 2 on the side where the claw portion 2b is not provided.

The air circuit breaker according to embodiment 1 has the bearing holding device 1 mounted on the housing 101 of the breaker main body 100.

According to the bearing holding device of the embodiment 1, even if the metal plate frame is thinner than the thickness of the bearing in the axial direction, the positioning and holding functions of the bearing can be realized without increasing the number of components, the number of assembling steps can be reduced, and the deterioration of the assembling accuracy can be prevented.

According to the air circuit breaker including the bearing holding device of embodiment 1, it is possible to reduce the weight of the product and improve the reliability by reducing the number of components.

Embodiment 2.

A bearing holding device according to embodiment 2 and an air circuit breaker using the bearing holding device will be described with reference to fig. 12.

In embodiment 2, the same components as or corresponding to those in embodiment 1 of the present invention will not be described. Next, differences from embodiment 1 of the bearing holding device according to embodiment 2 will be described with reference to the drawings.

Fig. 12 is a cross-sectional view of a bearing holding device 102 according to embodiment 2 corresponding to the position of the chain line B shown in fig. 10. Fig. 12 is a cross-sectional view of the bearing holding device 102 according to embodiment 2, which corresponds to a case where claws are provided at 3 positions along the mounting hole edge 2f shown in fig. 9.

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 attached and an outer wall surface 202d on the opposite side of the inner wall surface 202c in the thickness direction. 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 on the circumferential surface 202e of the bearing mounting hole 202 a.

In contrast to the structure in which the claw portion 2b and the outer wall surface 2d are flush with each other in embodiment 1, in the bearing holding device according to embodiment 2, the claw portion 202b has a structure protruding outward from the outer wall surface 202d on the outer wall surface 202d side. 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 attached while being offset 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 is increased. As a result, when a load is generated on the stepped shaft 3, stress generated in the sheet metal frame 202 and the bearing 4 can be reduced.

As in embodiment 1, in embodiment 2, the claw portions 202b are provided discontinuously at a plurality of positions along the mounting hole edge portion 202f of the bearing mounting hole 202 a. The claw portion 202b sandwiches the outer ring 4a of the bearing 4, and is not related to the shape if the movement of the bearing 4 in the outward direction of the claw portion 202b can be restricted.

The bearing attachment hole 202a and the claw portion 202b are formed integrally by press working.

Note that the bearing holding device according to embodiment 2 is the same as the bearing holding device according to embodiment 1 described above, except for the claw portions 202b of the sheet metal frame 202.

Further, the air circuit breaker using the bearing holding device according to embodiment 2 can also be configured in the same manner as the air circuit breaker using the bearing holding device according to embodiment 1.

According to the bearing holding device of the embodiment 2, even if the sheet metal frame is thinner than the thickness of the bearing in the axial direction, the positioning and holding function of the bearing is provided without increasing the number of components, the number of assembling steps can be reduced, and the deterioration of the assembling accuracy can be prevented.

Further, since the claw portion is configured to protrude outward from the outer wall surface of the sheet metal frame, the contact surface between the bearing and the bearing mounting hole is increased, and stress generated in the sheet metal frame and the bearing can be reduced, thereby improving the product life.

According to the air circuit breaker using the bearing holding device of embodiment 2, the weight reduction of the product and the improvement of the reliability and the life of the product can be achieved by reducing the number of components.

Embodiment 3.

A bearing holding device according to embodiment 3 and an air circuit breaker using the bearing holding device will be described with reference to fig. 13.

In embodiment 3, the same or corresponding portions as or to embodiment 1 of the present invention will not be described. Next, differences from embodiment 1 of the bearing holding device according to embodiment 3 will be described with reference to the drawings.

Fig. 13 is an enlarged oblique view of a bearing attachment hole 203a in a sheet metal frame 203 of a bearing holding device according to embodiment 3 corresponding to a portion indicated by a chain line a shown in fig. 8 (a).

As shown in fig. 13, in embodiment 3, the sheet metal frame 203 includes, on the circumferential surface 203e of the bearing attachment hole 203a, a claw portion 203b extending in the axial direction from an attachment hole edge portion 203f on the outer wall surface side of the sheet metal frame 203, and recesses 203g formed at both ends of the root portion of the claw portion 203 b.

The bearing attachment hole 203a, the claw portion 203b, and the recess 203g are integrally formed by 2-stage press working. First, the bearing mounting hole 203a and the recess 203g are simultaneously press-formed. Next, the claw portion 203b is formed by press working. By molding the recess 203g simultaneously with the bearing attachment hole 203a before molding the claw portion 203b, stress generated when molding the claw portion 203b can be concentrated on the recess 203g portion. Compared with the case where the recess 203g is not molded, deformation of the bearing mounting hole 203a due to stress generated around the claw portion 203b can be prevented.

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

Next, a 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 embodiment 3, as in the bearing holding device 1 according to embodiment 1, the claw portion 203b can be provided on the same plane as the outer wall surface of the sheet metal frame 203. In this case, the claw portions do not interfere with the members disposed outside the sheet metal frame, and therefore, the degree of freedom in designing the layout of the members and the like becomes high.

As in the bearing holding device 102 according to embodiment 2, the claw portion 203b may be provided 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, so that the stress generated in the sheet metal frame and the bearing can be reduced, and the product life can be prolonged.

When the claw portion 203b protrudes outward from the outer wall surface of the sheet metal frame 203, the bearing attachment hole 203a, the claw portion 203b, and the recess 203g are also integrally formed by 2-stage press working in the same manner.

The bearing holding device according to embodiment 3 is the same as the bearing holding device according to embodiment 1 or embodiment 2 except for the recesses 203g formed in the root portions of the claw portions 203b of the sheet metal frame 203.

Further, the air circuit breaker using the bearing holding device according to embodiment 3 can also be configured in the same manner as the air circuit breaker using the bearing holding device according to embodiment 1.

According to the bearing holding device of the embodiment 3, as in the embodiment 1, even if the metal plate frame is thinner than the thickness of the bearing in the axial direction, the positioning and holding functions of the bearing can be realized without increasing the number of components, the number of assembling steps can be reduced, and the deterioration of the assembling accuracy can be prevented.

In addition, the metal plate frame is provided with recesses at both ends of the claw portion, whereby deformation of the bearing mounting hole due to stress generated at the time of molding the claw portion can be prevented. This can prevent poor mounting of the bearing.

According to the air circuit breaker using the bearing holding device of embodiment 3, the weight of the product and the number of assembly man-hours can be reduced by reducing the number of components, deformation of the bearing mounting hole can be prevented, and the weight of the product and the reliability can be improved.

Embodiment 4.

A bearing holding device according to embodiment 4 and an air circuit breaker using the bearing holding device will be described with reference to fig. 14 and 15.

In embodiment 4, the same or corresponding portions as or to embodiment 1 of the present invention will not be described. Next, differences from embodiment 1 of the bearing holding device according to embodiment 4 will be described with reference to the drawings.

Fig. 14 is an oblique view seen from the side of the inner wall surface 204c of the sheet metal frame 204 in the bearing holding device 104 according to embodiment 4.

Fig. 15 is a sectional view showing a bearing holding device 104 according to embodiment 4.

As shown in fig. 14, in the bearing holding device 104 according to embodiment 4, the sheet metal frame 204 has an inner wall surface 204c on the side where the bearing 4 is attached and an outer wall surface 204d on the opposite side of the inner wall surface 204c in the thickness direction. A bearing attachment hole 204a and a claw portion 204b are formed in the sheet metal frame 204, and the claw portion 204b extends in the axial direction from the outer wall surface 204d side of the sheet metal frame 204 on the circumferential surface 204e of the bearing attachment hole 204 a. The bearing attachment hole 204a and the claw portion 204b are integrally formed by press working.

In contrast to the structure in which the claw portions 2b of the bearing attachment hole 2a are provided at a plurality of positions at substantially equal intervals along the attachment hole edge portion 2f of the bearing attachment hole 2a in embodiment 1, in embodiment 4, the claw portions 204b have a flange shape that is continuous along the attachment hole edge portion 204f on the circumferential surface 204e of the bearing attachment hole 204 a. That is, the claw portion 204b is formed in a shape in which the outer periphery of the disk having a hole formed in the center thereof is continuous with the mounting hole edge portion 204f on the outer wall surface 204d side.

Since the contact surface between the claw portion 204b having the continuous flange shape and the bearing 4 is increased, stress generated in the claw portion 204b can be reduced when a load is generated in the stepped shaft 3. Compared to the bearing holding device according to embodiment 1, the movement of the bearing 4 in the rocking direction can be more strongly restricted, and the holding performance can be improved.

As shown in fig. 15, the claw portion 204b is flush with the outer wall surface 204d on the outer wall surface 204d side of the sheet metal frame 204. Since the claw portion 204b and the outer wall surface 204d of the sheet metal frame 204 are provided on the same plane, the claw portion 204b does not interfere with a member disposed outside the sheet metal frame, and thus the degree of freedom in design such as the layout of the members is increased.

Note that the bearing holding device 104 according to embodiment 4 is similar to the bearing holding device according to embodiment 1, except for the sheet metal frame 204. Further, the air circuit breaker using the bearing holding device according to embodiment 4 can also be configured in the same manner as the air circuit breaker using the bearing holding device according to embodiment 1.

According to the bearing holding device of the embodiment 4, as in the embodiment 1, even if the metal plate frame is thinner than the thickness of the bearing in the axial direction, the positioning and holding functions of the bearing are realized without increasing the number of components, the number of assembling steps can be reduced, and the deterioration of the assembling accuracy can be prevented.

Further, since the contact surface between the claw portion of the bearing attachment hole and the bearing is large, stress generated in the claw portion can be reduced when a load is generated in the stepped shaft. As compared with the bearing holding device according to embodiment 1, the movement of the bearing in the rocking direction can be more strongly restricted, and the holding performance can be improved.

According to the air circuit breaker using the bearing holding device of embodiment 4, the weight reduction of the product and the reduction of the number of assembly man-hours can be achieved by reducing the number of components, the holding performance for the bearing can be improved, and the weight reduction and the reliability improvement of the product can be achieved.

Embodiment 5.

A bearing holding device according to embodiment 5 and an air circuit breaker using the bearing holding device will be described with reference to fig. 16 and 17.

In embodiment 5, the same components as or corresponding parts to those in embodiment 4 of the present invention will not be described. Next, differences from embodiment 4 of the bearing holding device according to embodiment 5 will be described with reference to the drawings.

Fig. 16 is a perspective view showing a bearing holding device 105 according to embodiment 5. Fig. 17 is a sectional view at the position of the chain line C shown in fig. 16.

As shown in fig. 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 attached and an outer wall surface 205d on the opposite side of the inner wall surface 205c in the thickness direction. A bearing attachment hole 205a and a claw portion 205b are formed in the sheet metal frame 205, and the claw portion 205b extends 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 attachment hole 205 a. The claw portion 205b has a flange shape continuous along the mounting hole edge portion 205 f. The bearing attachment hole 205a and the claw 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 embodiment 4, in embodiment 5, the claw portion 205b has a structure protruding outward from the outer wall surface 205d on the outer wall surface 205d side. That is, the claw portion 205b is formed to protrude outward from the outer wall surface 205d, and the outer periphery of the disk having a hole formed in the center thereof is continuous with 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 while being offset in the thrust direction toward the outer wall surface 205d side 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 is increased. As a result, when a load is generated on the stepped shaft 3, stress generated in the sheet metal frame 205 and the bearing 4 can be reduced.

The bearing holding device 105 according to embodiment 5 is similar to the bearing holding device according to embodiment 4 described above, except for the sheet metal frame 205. Further, the air circuit breaker using the bearing holding device according to embodiment 5 can also be configured in the same manner as the air circuit breaker using the bearing holding device according to embodiment 4.

According to the bearing holding device of the embodiment 5, even if the metal plate frame is thinner than the thickness of the bearing in the axial direction, the positioning and holding functions of the bearing can be realized without increasing the number of components, the number of assembling steps can be reduced, and the deterioration of the assembling accuracy can be prevented.

Further, since the contact surface between the claw portion of the bearing mounting hole and the bearing is large, stress generated in the claw portion can be reduced when a load is generated in the stepped shaft. Compared to the bearing holding device according to embodiment 1, the movement of the bearing in the rocking direction can be more strongly restricted, and the holding performance can be improved.

Further, since the claw portion is configured to protrude outward from the outer wall surface of the sheet metal frame, the contact surface between the bearing and the bearing mounting hole is increased, and stress generated in the sheet metal frame and the bearing can be reduced, thereby improving the product life.

According to the air circuit breaker using the bearing holding device according to embodiment 5, the weight reduction of the product and the improvement of the reliability and the life of the product can be realized by reducing the number of components.

While the present invention has been described with reference to various exemplary embodiments, the features, modes, and functions described in 1 or more embodiments are not limited to the application to the specific embodiments, and may be applied to the embodiments alone or in various combinations. Therefore, numerous modifications not illustrated are conceivable within the technical scope disclosed in the specification of the present application. Examples of the case include a case where at least 1 component is modified, added, or omitted, and a case where at least 1 component is extracted and combined with the components of other embodiments.

Description of the reference numerals

1. 102, 104, 105 bearing holding device

2. 202, 203, 204, 205 sheet metal frame

2a, 202a, 203a, 204a, 205a bearing mounting hole

2b, 202b, 203b, 204b, 205b jaw

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 part

3b minor diameter portion

4. Bearing assembly

4a outer ring

4b inner ring

4c medial side

4d lateral surface

21. Cam shaft

28. Main shaft

100. Circuit breaker main body

101. Frame body

300. An air circuit breaker.

Claims (9)

1. A bearing retainer comprising:

a bearing;

a stepped shaft rotatably held by the bearing; and

a sheet metal frame, the thickness of which is less than or equal to the axial thickness of the bearing, and provided with a bearing mounting hole for mounting the bearing,

the bearing includes an outer ring, an inner ring inside the outer ring, an inner surface facing in an insertion direction of the stepped shaft, and an outer surface opposite to the inner surface,

the stepped shaft has a stepped portion at an end portion thereof and a small diameter portion reduced in diameter with the stepped portion interposed therebetween, the small diameter portion being inserted into the inner ring until the stepped portion comes into contact with the inner ring on the inner surface side of the bearing,

the sheet metal frame has an inner wall surface on a side where the bearing is mounted, and an outer wall surface on a side opposite to the inner wall surface in a thickness direction,

the bearing mounting hole has a claw portion extending in the axial direction from a mounting hole edge portion on the outer wall surface side, and abutting against the outer ring on the outer side surface side of the bearing, in a circumferential surface of the bearing mounting hole.

2. The bearing retention apparatus of claim 1,

the sheet metal frames are a pair arranged oppositely,

the stepped shaft has the stepped portion and the small diameter portion at the end portions on both sides, respectively.

3. Bearing holding device according to claim 1 or 2,

the bearing mounting hole and the claw portion are integrally formed.

4. The bearing holding device according to any one of claims 1 to 3,

the claw portions are provided at a plurality of locations along the edge of the mounting hole.

5. The bearing retention apparatus of claim 4,

a recess is formed in the circumferential surface of the bearing mounting hole at the root of the claw portion.

6. The bearing holding device according to any one of claims 1 to 3,

the claw portion has a flange shape continuous along the edge of the mounting hole.

7. Bearing holding device according to one of the claims 1 to 6,

the claw portion is provided on the outer wall surface side in the same plane as the outer wall surface.

8. Bearing holding device according to one of the claims 1 to 6,

the claw portion is provided to protrude outward from the outer wall surface on the outer wall surface side.

9. An air circuit breaker mounting the bearing holding device of any one of the preceding claims 1 to 8 to a breaker main body.

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