JPH07734Y2 - Bearing support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a bearing support structure for holding a spherical bearing (spherical bearing) in a self-aligning manner.

[Conventional technology]

For example, as shown in FIG. 8, a motor used for a juicer or a mixer has a motor frame 60, a stator 50 including an iron core 51 and a winding 52 wound around the iron core 51.
Are connected. A rotor 54 is housed in the stator 50, and a motor shaft 55 is connected to the rotor 54. A commutator 57 is attached to the motor shaft 55, and brushes 58, 58 are in sliding contact with the commutator 57.
The brushes 58 are attached to brush holders 59, and the brush holders 59 are fixed to the motor frame 60.

The motor shaft 55 is supported by bearings 56 attached to the motor frame 60. The bearing 56 has a hole through which the motor shaft 55 penetrates and has a spherical outer surface. The bearing 56 is held so as to be automatically aligned with a motor frame 60 as a bearing support member.

A conventional support structure for the bearing will be described.

In the example shown in FIG. 9, the bearing support member 70 is formed of a metal plate, and the bearing support member 70 is formed with a dish-shaped housing 71. An inverted dish-shaped presser spring 72 is screwed on the bearing support member 70 facing the housing 71.
It is concluded by 73. The bearing 56 is held between the housing 71 and the pressing spring 72 so that the bearing 56 can roll, that is, can be automatically aligned. The shaft 55 passes through the bearing 56.

In another conventional case shown in FIGS. 10 and 11, the bearing support member 80 is formed of a relatively soft elastic material such as synthetic resin or aluminum (including aluminum alloy). The member 80 is formed with a basin-shaped housing 81. The bearing 81 is accommodated in the housing 81. This housing 81 has openings at both ends, one opening has an opening larger than the outer diameter of the bearing 56, the bearing 56 can be inserted, and the other opening is larger than the outer diameter of the bearing 56. It has a small opening, and the bearing 56 has a size that cannot be pulled out. A plurality of ribs 82 are projected on the inner surface of the housing 81 at intervals in the circumferential direction. The ribs 82 extend along the axial direction connecting the both openings of the housing 81. There is.

The bearing 56 is press-fitted into the housing 81 of the bearing support member 80. The outer surface of the spherical surface of the bearing 56 abuts against the ribs 82, and is held in the housing 81 by the frictional force with the ribs 82 due to the elastic force of the ribs 82.

However, in the conventional case shown in FIG.
Since parts such as a screw and a screw 73 are required, the number of parts is increased, assembly is troublesome, and the cost becomes high.

Further, in the case of the structure shown in FIG. 10 and FIG. 11, an error is likely to occur in the protrusion amount of the ribs 82 due to molding variations, and the bearing
The elastic force holding 56 may not be constant. That is, if there is an error in the amount of protrusion of the ribs 82, the pressure input will vary, and when the bearing 56 is inserted, a large pressure input is required, or the accommodated bearing 56 can roll due to a large frictional resistance. However, the self-aligning function may be impaired, and conversely, if the pressure input is small, there is a concern that it may easily come out. In addition, the ribs 82 are worn or thermally deformed during use, so that the amount of protrusion is small and the bearing 56 may slip out.

Under such circumstances, a self-aligning support structure for a bearing as described in Japanese Utility Model Laid-Open No. 52-71645 has been conventionally proposed. This bearing is inserted into this housing in a posture in which the axial direction of the through hole is upright when the bearing is inserted in the housing formed in the bearing support member, and the bearing is inserted after this insertion. Is rotated in the housing to restore a horizontal posture, and in this case, the plurality of protrusions formed in one opening of the housing prevents the bearing from coming off.

Therefore, according to the structure described in the above publication, the number of parts for supporting the bearing is small, and since the number of parts is small, assembly is not required and the bearing housed in the housing is small. There is an advantage that the slip-out can be surely prevented.

[Problems to be solved by the device]

By the way, according to the bearing support structure described in the above publication, when the bearing is inserted into the housing, the bearing is inserted into the housing in a posture in which the axial direction of the through hole is upright in a direction substantially orthogonal to the axial direction of the housing. After this insertion, it is necessary to rotate the bearing in the housing to restore the horizontal posture, that is, it is necessary to rotate the bearing in the housing.

However, since the housing is a narrow space, it is not easy to rotate the bearing inside the housing. Even if you try to rotate the bearing by inserting your finger from one of the openings, there is no room to insert your finger, and even if you try to rotate the bearing by inserting a tool such as a screwdriver, you can rotate the driver. There is not enough space to do it. For this reason,
The tool may forcibly rotate the bearing, and the tip of the tool may twist the bearing.Therefore, there is a risk of damaging the bearing and housing, and the bearing does not rotate smoothly, which makes the work troublesome. There is also such a problem.

Therefore, an object of the present invention is to provide a bearing support structure which can easily rotate a bearing housed in a housing in an upright position to make it horizontal, and which is excellent in workability.

[Means for Solving the Problems]

To achieve the above object, a first aspect of the present invention has a through hole through which a shaft penetrates, a bearing having an outer spherical surface, and a housing in which the bearing is rotatably housed. A bearing support member in which the bearing is supported so as to be capable of self-aligning in a housing, and the bearing is formed such that the thickness of the through hole in the axial direction is smaller than the maximum outer diameter of the spherical surface portion. The housing of the support member accommodates the bearing in a slidable manner, and has an opening at both ends through which a shaft penetrated by the bearing penetrates, and one opening has a maximum outer diameter of the spherical portion of the bearing. The opening of the other side is larger than the maximum outer diameter of the spherical surface of the bearing so that the bearing cannot be pulled out. In the part, the above bearing A plurality of circumferentially spaced protrusions that restrict the bending are provided, and the plurality of protrusions can pass with the bearing set in a posture in which the axial direction of the through hole is substantially orthogonal to the axial direction of the housing. An arc having a separation dimension and connecting the tips of the plurality of protrusions has a diameter smaller than the maximum outer diameter of the spherical surface portion so that the bearing is prevented from coming out when the bearing is tilted from the standing posture. In the bearing support structure formed so that a jig for rotating the bearing is inserted into the through hole of the bearing housed in the housing in one or the other opening of the housing. Provided with a notch that can be inserted,
The notch is located in a part of the opening in the circumferential direction, extends in the radial direction, and has a groove shape opened in the same direction as the opening of the opening.

[Action]

According to the present invention, the bearing inserted in the housing in the upright posture can be rotated and corrected to a normal horizontal posture by the jig inserted through the notch formed in the one opening. Therefore, the posture of the bearing can be easily changed within the housing, the change work is simplified, and problems such as damage to the bearing and the housing can be prevented.

〔Example〕

Hereinafter, the present invention will be described with reference to the first embodiment shown in FIGS.
A description will be given based on the embodiment of.

In the figure, reference numeral 1 is a bearing made of oil-impregnated metal, and this bearing 1 has a through hole 3 through which a shaft 2 to be supported is passed.
have. The outer surface of the bearing 1 is substantially spherical, and the upper and lower end surfaces corresponding to both axial ends of the through hole 3 are cut to be flat surfaces. Therefore, the bearing 1 is drum-shaped. The maximum outer diameter D ₁ of the spherical portion of the bearing 1 is formed larger than the thickness t along the axial direction of the through hole 3 (D _1> t).

Reference numeral 5 is a bearing support member formed of a relatively soft elastic material such as synthetic resin or aluminum, and corresponds to the motor frame 60 in FIG.

The bearing support member 5 has a basin-shaped housing 6. The housing 6 is open at the upper end and the lower end, and the upper end opening has an opening diameter D ₂ larger than the outer diameter D _{1 of the} bearing 1, and the bearing 1 can be inserted from this upper end opening. ing.

The lower end opening of the housing 6 has an opening diameter smaller than the maximum outer diameter D _{1 of the} bearing 1 so that the bearing 1 does not come out of the lower end opening. Housing 6
An inclined surface 7 facing the lower end opening is formed on the inner surface of the bearing 1, and the spherical surface of the bearing 1 is slidably abutted on the inclined surface 7 to enable automatic alignment.

The housing 6 has a plurality of circumferentially spaced inner surfaces,
In this embodiment, three ribs 8 ... Are provided at equal intervals in the circumferential direction. These ribs 8 extend along the axial direction of the housing 6 and are formed straight so as to avoid the inclined surface 7.

The spherical surface of the bearing 1 housed in the housing 6 is in contact with or elastically contacted with the tips of the inner surfaces of the ribs 8 ... Therefore, the diameter of the circle connecting the inner ends of these ribs 8 ...
Equal to the maximum outer diameter D ₁ of the spherical surface of the bearing 1, or a slight sliding friction are reduced form to the extent that it is possible sliding contact occurs.

Protrusions 9 ... further protruding toward the center side from the ribs 8 ... Are provided at end portions of the ribs 8 ...

Between the plurality of projections 9 ..., the housing 1 is in a posture in which the through hole 3 stands in a direction substantially orthogonal to the axial direction of the housing 6 as shown by an imaginary line in FIG. The bearing 1 has a separation distance that allows the bearing 1 to be inserted when the bearing 1 is inserted into or pressed into.

When there are three protrusions 9 at equal intervals, when the bearing 1 in an upright posture is to be inserted or press-fitted into the housing 6, as shown in FIG. Can pass through an eccentric position from the above, and the intervals between the plurality of projections 9 have a relationship allowing such passage.

However, the plurality of projections 9 ... In order to prevent the bearing 1 from slipping out when the arc connecting the inner surface side tips thereof is laid down from the upright posture of the bearing 1 as shown in FIG. The diameter D _{3 of the} circle connecting the tips is smaller than the maximum outer diameter D ₁ of the spherical surface of the bearing 1 (D ₃ <D ₁ ).

In the bearing support member 5 having such a configuration, the notch 20 is provided at either the upper end opening or the lower end opening of the housing 6.
Are formed. In this embodiment, as shown in FIGS. 4 and 5, a notch 20 is formed in the lower end opening of the housing 6, and the notch 20 is located at a part of the lower end opening in the circumferential direction. , Is formed in a groove shape that extends in the radial direction and is opened in the same direction as the opening direction of the lower end opening.
As shown in FIG. 6, a jig 21 such as a rod can be inserted into the notch 20, and the tip of the jig 21 can be inserted into and removed from the through hole 3 of the bearing 1. It is supposed to be done. The jig 21 inserted in the notch 20 is rotated counterclockwise from the inserted state shown in FIG. 6 so that the bearing 1 in the housing 6 can be rotated in a horizontal posture. ing.

The operation of the first embodiment having such a configuration will be described.

First, the procedure for attaching the bearing 1 to the housing 6 of the bearing support member 5 will be described.

As shown by the imaginary line in FIG. 2, the bearing 1 is in a standing posture such that the through hole 3 is in a direction substantially orthogonal to the axial direction of the housing 6, and is inserted from the upper end opening of the housing 6 in this posture. .

In this case, the equal intervals of the protrusions 9 formed on the upper end opening are
As shown in FIG. 3, the bearing 1 is set so that it can pass through the bearing 1 in the upright posture.
Can be inserted or pressed into the housing 6.

As shown in FIGS. 1 and 2, the bearing 1 housed in the housing 6 is changed in posture such that the through hole 3 is substantially aligned with the axial direction of the housing 6 in the housing 6. To sleep. Then, the spherical surface of the bearing 1 hits the inclined surface 7 and the plurality of ribs 8 formed on the inner surface of the housing 6, whereby the bearing 1 is held in the housing 6.

In such a state, the spherical surface of the bearing 1 contacts the inclined surface 7 of the inner surface of the housing 6 and the plurality of ribs 8 ...
The bearing 1 can roll, and the shaft 2 inserted in the through hole 3 can be aligned.

Further, when the bearing 1 tries to come out downward in the housing 6, it is prevented by the inclined surface 7 and does not come out because the size of the lower end opening is smaller than the outer diameter D ₁ of the spherical surface of the bearing 1.

Further, when the bearing 1 tries to come out upward in the housing 6, the diameter D _{3 of the} circle connecting the tips of the plurality of projections 9 formed in the upper end opening is smaller than the maximum outer diameter D ₁ of the spherical surface of the bearing 1. (D ₃ <D ₁ ) so that they are prevented from coming out upward.

Although the bearing 1 may come out when the bearing 1 is in a standing posture in the housing 6, the shaft 2 is inserted into the through hole 3 of the bearing 1.
Since there is no possibility that the bearing 1 will be in a standing posture when the bearing 2 is inserted, there is no concern that the bearing 2 will come off the housing 6 while the shaft is supported.

By the way, when the bearing 1 is housed in the upright posture and is rotated to be horizontal, the jig 21 such as a rod is inserted into the notch 20 formed in the lower end opening to rotate. Can be made. That is, as shown in FIG.
Insert the tip of the jig 21 inserted through
In this state, the jig 21 is rotated counterclockwise. Then,
Within the housing 6, the bearing 1 can be turned from a standing posture to a lying posture.

Therefore, the posture of the bearing 1 inserted in the housing 6 can be easily changed.

In this case, since the jig 21 is inserted into the through hole 3 of the bearing 1,
There is no need to worry about damaging the bearing 1 or housing 6 with the jig 21,
The rotation operation is also extremely easy, and the posture change work of the bearing 1 can be efficiently performed.

In this embodiment, since the spherical surface of the bearing 1 is held by contacting the inclined surface 7 and the plurality of ribs 8 formed on the inner surface of the housing 6, the contact area is small and the rolling resistance of the bearing 1 is small. It can be small.

Further, since the bearing 1 is held by the spherical surface of the bearing 1 hitting the ribs 8, the predetermined frictional resistance can be obtained by appropriately selecting the pressing force on the ribs 8 and the radial rattling. Can be prevented. In such a pressure contact state, even if the ribs 8 are worn or thermally deformed to increase the diameter of the circle connecting the tips of the ribs 8 and decrease the pressing force, the bearing 1 is projected. Since the slip-out is prevented by 9 ..., there is no fear of impairing the bearing function.

The present invention is not limited to the above-mentioned first embodiment.

That is, in the above-described first embodiment, when the bearing 1 housed in the housing 6 is in a horizontally lying posture, gaps are formed between the plurality of projections 9 formed in the upper end opening of the housing 6 and the bearing 1. However, a gap may not be formed between the protrusion 19 and the bearing 1 as in the second embodiment shown in FIG.

By doing so, the rattling in the thrust direction is eliminated, and the shaft 2 can be reliably supported.

It should be noted that the present invention is not limited to the existence of the ribs 8 as long as the projections 9 are provided.

Further, the present invention is not limited to being applied to a motor shaft such as a juicer or a mixer shown in FIG.

Furthermore, the present invention can be variously modified within the scope of the subject matter described in the claims for utility model registration.

[Effect of device]

As described above, according to the present invention, since the opening portion of the housing is provided with the notch portion into which the jig can be inserted, the jig is inserted into the through hole of the bearing in the standing posture housed in the housing to rotate. By doing so, the bearing can be rotated in a regular horizontal posture. Therefore, the posture of the bearing can be easily changed within the housing, the change work is simplified, and problems such as damage to the bearing and the housing can be prevented.

[Brief description of drawings]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a plan view with a bearing mounted, FIG. 2 is a sectional view, and FIG. 3 is a housing in a standing posture. FIG. 4 is a bottom view, FIG. 5 is a side view, and FIG.
The figure shows a sectional view when rotating the bearing in the housing.
FIG. 8 is a sectional view showing a second embodiment of the present invention with a bearing attached, FIG. 8 is a front view of a motor for explaining the background art of the present invention, and FIG. 9 is a conventional bearing support structure. The sectional views shown, FIGS. 10 and 11 show another conventional bearing support structure, FIG. 10 is a sectional view, and FIG. 11 is a plan view. 1 ... Bearing, 2 ... Shaft, 3 ... Through hole, 5 ... Bearing support member, 6 ... Housing, 7 ... Inclined surface, 8 ... Rib,
9, 19 ... Protrusion, 20 ... Notch, 21 ... Jig

Claims (1)

[Scope of utility model registration request] 1. A through hole through which a shaft penetrates,
The bearing includes a bearing having an outer spherical surface, and a bearing having a housing in which the bearing is rotatably accommodated and in which the bearing is supported so that the bearing can be self-aligned. The thickness of the through hole along the axial direction is formed to be smaller than the maximum outer diameter of the spherical surface portion, and the housing of the bearing support member has the bearing slidably accommodated therein, and both ends thereof are penetrated by the bearing. There is an opening through which the shaft penetrates, one opening having a size larger than the maximum outer diameter of the spherical surface of the bearing so that the bearing can be inserted, and the other opening has the spherical surface of the bearing. Has a size that is smaller than the maximum outer diameter of the bearing so that the bearing cannot be removed, and one opening of the housing is provided with a plurality of circumferentially spaced protrusions that restrict the bearing from coming out. The protrusion penetrates the bearing. The axial direction of the hole has a separation dimension that allows passage while standing in a posture in a direction substantially orthogonal to the axial direction of the housing, and the arc connecting the tips of the plurality of projections is the posture in which the bearing is set up. In a bearing support structure formed so as to have a diameter smaller than the maximum outer diameter of the spherical surface portion so as to prevent the bearing from slipping out in a state of being tilted from A notch is provided which is inserted into a through hole of a bearing housed in the housing and into which a jig for rotating the bearing can be inserted.
The bearing support structure is characterized in that the notch is located in a part of the opening in the circumferential direction, extends in the radial direction, and has a groove shape opened in the same direction as the opening of the opening. .