JPH0632778Y2 - Bearing mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bearing mounting structure, and more specifically, to a DC brushless unit directly connected to a fan rotor of a cross flow fan in an indoor unit of an air conditioner, for example. The present invention relates to a bearing mounting structure used when configuring a motor or the like.

[Conventional technology]

Conventionally, the rotational drive of a cross flow fan used in an air conditioner or the like is performed by disposing a separate electric motor such as an AC induction motor adjacent to the cross flow fan in the device.
The drive shaft and the rotation shaft of the fan rotor are connected by a coupling. For this reason, there is a drawback in that a space for accommodating the above-mentioned electric motor is required inside the device, and the device becomes large in size. Therefore, in recent years, as disclosed in, for example, Japanese Utility Model Laid-Open No. 61-178095, an attempt has been made to downsize the device by directly connecting the rotor of the DC brushless motor to the side plate of the fan rotor. Has been done.

In the above, the rotary shaft supporting the rotor is penetrated into the hollow cylindrical fixed shaft of the stator, and each end of the rotary shaft and the fixed shaft is independently supported by the device wall surface. However, there is a problem in that the structure becomes complicated. Therefore, the present applicant previously proposed a structure in which the rotor and the stator are supported by a common fixed shaft in order to simplify the structure (see Japanese Patent Application No. 62-194080). The structure will be described with reference to FIG. 11. In FIG. 11, 81 is a fan rotor of a cross flow fan, and one side plate 82 of the fan rotor 81 has a rotor 83.
Vertical end faces of the substantially cup-shaped casing 84 are connected via a connecting member 85 made of an elastic body. A central bulging portion 86 protruding toward the fan rotor 81 is formed at the axial center position of the vertical end surface of the casing 84, and a bearing 87 is press-fitted into the central bulging portion 86. On the other hand, in the same figure, 91 is an end bracket fixed inside the indoor unit of the air conditioner, and a fixed shaft 92 is erected at the axial center position of this end bracket 91, and in the middle of this fixed shaft 92. stator
93 is stuck. By inserting the tip side of the fixed shaft 92 into the bearing 87, the permanent magnet 94 attached to the inner wall surface of the cylindrical portion of the casing 84 is located at a position facing the outer peripheral surface of the stator 93. Thus, a fan device in which a DC brushless motor type fan motor is connected to the fan rotor 81 is configured. By fixing the end bracket 91 inside the indoor unit of the air conditioner, the fixed shaft 92, together with the stator 93, also functions as a support shaft on the rotor 83 side. In the figure
Reference numeral 95 denotes a printed circuit board on which control circuit components necessary for generating a rotating magnetic field are attached to the stator 93.

(Problems to be Solved by the Invention) As described above, by adopting the configuration in which the rotor 83 is also supported by the fixed shaft 92, the structure is simplified and the fixed shaft 92
The assembly can be performed by an extremely simple operation of inserting the tip side of the into the bearing 87. In the assembled state, the axial position on the rotor 83 side is such that the axial center positions of the two magnets 94, 93 substantially coincide with each other due to the magnetic attraction force acting on the stator 93 from the permanent magnet 94. Automatically maintained. However, since the self-centering force due to such magnetic attraction force is substantially proportional to the relative displacement amount between the permanent magnet 94 and the stator 93, the self-centering force is small while the displacement amount is small, and When the axial moving force on the rotor 83 side is generated, even if the moving force is small, a small axial movement can be generated on the rotor 83 side. Therefore, due to vibration or the like generated when the fan rotor 81 is rotationally driven, a slight vibration occurs in which the bearing 87 reciprocates in the axial direction along the fixed shaft 92, which causes a problem that noise is generated. In order to prevent such noise, it is necessary to assemble the bearing 87 so as to regulate the movement of the bearing 87 with respect to the fixed shaft 92.
Since the tip end side of the fixed shaft 92 is covered with the fan rotor 81 after the insertion, the retaining ring or the like conventionally used as a fixture for the bearing cannot be attached, or the bearing 87 is fixed. In the case where the tip of the shaft 92 is press-fitted, a complicated press-fitting jig or the like for holding the rotor 83 assembled to the fan rotor 1 is required, and the assembly work becomes complicated. Will occur.

The present invention has been made in view of the above, and an object thereof is to regulate the axial position of the bearing without impairing the workability of assembling the bearing fitted on the free end side of the fixed shaft. As a result, for example, it is to provide a bearing mounting structure capable of reducing noise and the like when the above-described cross-flow fan is rotationally driven.

(Means for Solving Problems) Therefore, the bearing mounting structure of the present invention is a bearing mounting structure in which a bearing 8 is externally fitted to the free end side of the fixed shaft 6, and the fixed shaft 6 has A recess 33 is provided in the middle, and the bearing 8 is also provided.
A recessed groove 38 extending in the axial direction is formed on the outer periphery of the free end side tip portion having substantially the same diameter as the inner peripheral surface of the fixed portion 41, which is fitted in the recess 33 to restrict the movement in the axial direction.
And a bearing fixing member 40 having a flexible portion 43 extending from the fixing portion 41 to the tip side along the concave groove 38 and elastically deformable in the concave groove 38 in the radial direction. A position regulating portion 44 is formed at an axially intermediate portion of the flexible portion 43 so as to be connected to a tip portion located in the recessed groove 38 and project radially outward from the recessed groove 38. When the fitting position of the bearing 8 from the tip reaches a position where it is pushed by the inner peripheral surface of the bearing 8 and beyond the position regulating portion 44 buried in the recessed groove 38, the tip side of the bearing 8 The elastically restoring force of the flexible portion 43 for returning the position regulating portion 44, which is in contact with the corner portion of the end face, to the outside in the radial direction is configured to regulate the movement of the bearing 8 toward the tip side. .

(Operation) In the bearing mounting structure described above, when the bearing 8 is fitted from the tip side of the fixed shaft 6, the position restricting portion 44 of the bearing fixing member 40 mounted on the fixed shaft 6 has After being pressed by the inner peripheral surface and buried in the recessed groove 38, it projects radially outward from the recessed groove 38 and abuts on the corner of the tip end side end surface of the bearing 8, and the tip end side of the bearing 8 It is designed to regulate movement to. Therefore, for example, in assembling the DC brushless motor type fan motor to the above-mentioned cross flow fan, etc., the stepped portion of the fixed shaft and the position regulating portion 44
By arranging the bearing 8 in the axial direction between the bearing 8 and the bearing 8, the bearing 8 can be easily assembled by inserting the tip side of the fixed shaft 6 into the bearing 8 as described above.
The axial movement of is mechanically restricted and the mounting state is
For example, it is possible to reduce noise when the fan rotor is rotationally driven.

(Example) Next, a specific example of the bearing mounting structure of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a configuration of one side plate (hereinafter, referred to as a right side plate) 2 side of a fan rotor 1 of a cross flow fan in an indoor unit of an air conditioner. The DC brushless motor type fan motor M configured by applying is connected. The fan motor M
Is composed of a rotor 4 connected to the right side plate 2 via a connecting member 3 and a stator 5, and a base end side (a right end side in the drawing) of a fixed shaft 6 to which the stator 5 is attached. ) Is fixed to the end bracket 7. And the fixed shaft 6
The tip end side (left end side in the figure) of the above is configured to rotatably support the rotor 4 side via a bearing 8 mounted at the axial center position of the rotor 4. The end bracket 7 is a lower mounting portion 10 provided on a main body frame 9 which constitutes a rear panel of an indoor unit of an air conditioner, and a motor cover screwed to the main body frame 9 from above.
It is fixed to the body frame 9 by being pressed in the up-down direction (screw fastening direction) while being surrounded by the upper mounting portion 12 provided in 11 over the entire circumference.

First, the structure of the rotor 4 will be described with reference to the exploded perspective view of FIG. This rotor 4 has casings 13 and 4
It is composed of a circular arc-shaped permanent magnet 20, ... And a substantially cylindrical lid 21. The casing 13 has a vertical surface 14,
The vertical surface 14 is formed into a cup shape having a cylindrical portion 15 extending from the outer peripheral edge to the right side in the drawing and opening on the right side. First, the vertical surface 14 is connected to the fan rotor via the connecting member 3. 1 is fixed to the right side plate 2. The connecting member 3 has a vibration damping function for damping the propagation of vibration due to rotational shake in the fan rotor 1, and is formed of an elastic material such as synthetic rubber into a ring shape and a substantially U-shaped cross section. ing. Then, the casing 13
The permanent magnets 20 are mounted along the inner peripheral surface of the cylindrical portion 15. For this reason, on the vertical surface 14, four substantially arcuate locking pieces 16, 16 which are cut and raised at the opening end side at positions where the circumference concentric with the cylindrical portion 15 is divided into four equal parts. , And short claw-shaped protrusions 17 ... That are cut and raised at two positions on the circumference between these locking pieces 16 ,. On the other hand, each of the permanent magnets 20 is formed in a shape having an arc length that divides the inner circumference of the cylindrical portion 15 into approximately four equal parts.
Between them, by pushing along the inner peripheral surface of the cylindrical portion 15 from the opening end side of the casing 13 in the axial direction,
The outer peripheral surface of each permanent magnet 20 is in close contact with the inner peripheral surface of the cylindrical portion 15 in a mounted state. That is, on the inner peripheral surface sides of both ends of each permanent magnet 20 in the circumferential direction, inclined surfaces that are inclined with respect to the radial direction are formed, and the arcuate locking pieces 16 are fitted between the adjacent inclined surfaces. , By the abutment, a force is applied from the arcuate locking piece 16 to the permanent magnets 20 in the circumferential direction and in the radial direction outward, and as a result, the radial position of each permanent magnet 20. The fixing and the position fixing in the circumferential direction are simultaneously and accurately provided.

On the other hand, in the axial fixing in the assembled state, the left end surface of each permanent magnet 20 is brought into contact with the tip end portion of each of the claw-shaped projections 17 so that the positioning is first performed on the left end side. It is provided by covering the body 21 with the casing 13. Fitting holes 22 are formed in the lid body 21 at appropriate positions on the peripheral side surface thereof, while the cylindrical portion 15 of the casing 13 has a circular arc shape protruding outwardly in the radial direction. Locking pieces 18 ... 18 are formed. The lid 21 is fixedly attached to the casing 13 by pushing the lid 21 in the axial direction and fitting the locking piece 18 into the fitting hole 22. At this time, the right end surface of the lid body 21 is provided with a fixing surface 23 that is bent inward in the radial direction and slightly covers the outer peripheral side of each permanent magnet 20 over the entire circumference. Each permanent magnet 20 is sandwiched between the fixing surface 23 and each of the claw-shaped projections 17, so that axial fixation is performed. At the axial center of the vertical surface 14 of the casing 13 of the rotor 4, there is formed a central bulging portion 19 projecting to the fan rotor 1 side, and the bearing 8 is press-fit into the central bulging portion 19. Has been done.

On the other hand, the stator 5 is attached to the middle portion of the fixed shaft 6 whose right end is fixed to the end bracket 7, but the stator 5 is opposed to the end bracket 7 before the assembly of the stator 5. Thus, the printed circuit board 24 is arranged. The end bracket 7 has a substantially square vertical surface 25, and a short rising edge 26 extending from the outer peripheral edge of the vertical surface 25 toward the stator 5 is formed. The circuit board 24 is arranged at a position surrounding the outer periphery on the tip side of the rising edge 26. Control circuit components necessary for controlling the rotation of the fan motor M are attached to the circuit board 24. And in each circuit component attached to the circuit board 24,
The power transistors Q1 to Q7 that generate a large amount of heat are printed on the circuit board 24.
Are arranged on the outer peripheral edge side of each of the above, and the lead parts are bent and attached so that their heat radiating surfaces are parallel to the vertical surface 25 of the end bracket 7. On the other hand, the end bracket 7 has the rising edge 26 surrounding the outer periphery of the vertical surface 25 at each of the power transistors.
Notches are formed in the areas facing Q1 to Q7 from the outside. Then, using the substantially U-shaped clip springs 27 and 28 as shown in FIG. 4 or 5, as shown in FIG. 6 and FIG. 7, cooling fin portions such as power transistors Q1 and Q6 are provided. By sandwiching the end bracket 7 integrally with the peripheral side of the vertical surface 25, the heat dissipation surface side of each power transistor can be held in close contact with the end bracket 7.

As described above, by closely holding the heat radiation surface of each power transistor Q1 to Q7 to the end bracket 7, the entire end bracket 7 acts as a heat radiation surface for each power transistor Q1 to Q7 that generates heat when energized. Therefore, overheating is prevented, and more stable operating characteristics are obtained. The close contact holding state as described above can be given by an extremely simple operation of pushing in the clip springs 27, 28. Further, by holding the power transistors Q1 to Q7 in close contact with each other as described above, the entire circuit board 24 is fixed in position with respect to the end bracket 7, and therefore, for example, screws for fixing the circuit board 24 to the end bracket 7 are used. It is possible to eliminate the need for fastening work.

After mounting the circuit board 24 as described above, as shown in FIG. 8, a stator 5 having 6-pole magnetic poles formed in a star shape and having coils 29, ... To
It is attached to the fixed shaft 6 which is erected at the center of the end bracket 7. As shown in the figure, the fixed shaft 6 has a large-diameter portion 31 on the rear end side of the ent bracket 7,
From this large-diameter portion 31 to the tip side, a stator fitting portion 32 having a smaller diameter than the large-diameter portion 31 and a small-diameter annular groove that becomes a recess for fixing the axial position of a bearing fixing member 40 described later. 33, a bearing contact portion 34 having substantially the same diameter as the stator fitting portion 32, and a bearing fitting portion 35 having a diameter smaller than the bearing contact portion 34 and larger than the annular groove 33 are sequentially formed. And is connected to the tapered end portion 36. Then, on the outer circumference from the stator fitting portion 32 to the bearing fitting portion 35, flat surface portions 37 extending in the axial direction are formed at axially symmetrical positions, and the width between these flat surface portions is the annular groove 33. The diameter is substantially the same. Further, a recessed groove 38 reaching the tip tapered portion 36 is further formed in the axial direction in the flat surface portion 37 on the outer periphery of the bearing fitting portion 35.

On the other hand, at the axial center position of the stator 5, the stator fitting portion
An insertion hole 39 having substantially the same shape as the cross section of 32 is formed. The fixed shaft 6 is inserted into the insertion hole 39 by arranging the flat portions of both 32 and 39 to be at the same circumferential position. As shown by the chain double-dashed line in the figure, the rear end surface of the stator 5 is located at a position where it abuts on the stepped portion between the stator fitting portion 32 and the large diameter portion 31. Next, the bearing fixing member 40 is attached to the fixed shaft 6
Attach from the side.

The bearing fixing member 40 is formed by molding a thin steel plate, and has an arc-shaped fixing portion 41 and fixing portions extending rearward from the rear end surface of the fixing portion 41 in parallel with each other in axial symmetry positions in parallel with each other. It has child regulation pieces 42, 42, and flexible portions 43, 43 extending forward from the front end surface of the fixed portion 41 in the direction in which the stator regulation pieces 42, 42 extend, respectively.
The fixed portion 41 is formed by an inner peripheral surface having substantially the same diameter as the annular groove 33 of the fixed shaft 6 and an axial width. Then, the stator restricting pieces 42, 42 are positioned along the respective flat surface portions 37 of the fixed shaft 6, and the arc-shaped fixing portion 41 is slightly expanded on the opening side of the fixing portion 41, and the fixed portion 41 is inserted into the annular groove 33. By being fitted externally, the inner peripheral surface of the fixed portion 41 is in a state of being attached in close contact with the annular groove 33, and the fixed portion 41 is provided between the stator fitting portion 32 and the annular groove 33. Step part and bearing contact part
The stepped portion between the 34 and the annular groove 33 restricts the movement in the axial direction, so that the bearing fixing member 40 is attached to the fixed shaft 6 in a fixed axial position. At this time, the rear end surfaces of the stator restricting pieces 42, 42 of the bearing fixing member 40 come into contact with the end surface of the stator 5 on the front end side, and the movement of the stator 5 toward the front end is restricted.
That is, the fixing of the mounting position in the axial direction with respect to the stator 5 is provided by the stator restricting piece 42.

On the other hand, in the attached state, the flexible portion 43, 43,
Each of the fixed shafts 6 extends axially toward the tip end side along a recessed groove 38 formed on the tip end side. Then, in each of the flexible portions 43, 43, as shown in FIG. 8, the shape from the middle portion to the tip side is formed in a dogleg shape projecting outward in the radial direction, The tips of these dog-legged portions are located in the recessed groove 38, and each apex region of the dog-legged portion projects outward from the recessed groove 38, and as will be described later, the bearing The position regulating portion 44 serves to prevent the 8 from being pulled out toward the tip side.

After the bearing fixing member 40 as described above is attached to the fixed shaft 6 and the stator 5 is attached to the fixed shaft 6, the tip side of the fixed shaft 6 is attached to the axial center of the rotor 4. It is inserted into the bearing 8 which is press-fitted in the position. FIG. 2 shows a state in the middle of the insertion process. The corner portion of the inner peripheral surface of the bearing 8 on the right end surface in the figure moves toward the bearing fitting portion 35 from the tip tapered portion 36 of the fixed shaft 6 and the flexible portion 43.
From the tip located in the recessed groove 38 to the position regulating portion.
By first contacting an inclined surface that is inclined radially outward toward 44, and further continuing the insertion operation into the bearing 8 in a state of slidingly contacting the inclined surface, the flexible portion 43 is fixed. With the portion 41 side as a fulcrum, elastic flexural deformation gradually sinks into the recessed groove 38, and as shown in the figure, the outer apex of the position restricting portion 44 also has an inner peripheral surface of the bearing 8. Then, a transitional state of receiving a pressing force inward in the radial direction and being buried in the recessed groove 38 results. When the right end surface of the bearing 8 comes into contact with the bearing abutting portion 34 after this transitional state, the inner peripheral surface side corner portion of the end surface of the bearing 8 at the tip side (left end side in the drawing) has the above-mentioned position regulation. It is designed to be located at a position beyond the outer apex of the portion 44, and as a result,
As shown in FIG. 1, the elastic restoring force of the flexible portion 43 causes the outer apex of the position regulating portion 44 to extend radially outward from the recessed groove 38 beyond the inner peripheral surface of the bearing 8. As a result, the inner peripheral side corner of the left end surface of the bearing 8 comes into contact with the inclined surface inclined from the outer apex of the position restricting portion 44 toward the fixed portion 41. Then, in this way, the bearing 8 is provided on the inclined surface.
The elastic restoring force of the flexible portion 43 outward in the radial direction due to the abutting of the flexible portion 43 pushes the bearing 8 toward the base end side (the right end side in the drawing) of the fixed shaft 6. Also, the bearing 8 is axially sandwiched between the position restricting portion 44 of the bearing fixing member 40 and the bearing abutting portion 34 of the fixed shaft 6 in the mounted state. As described above, by substantially the same work as the conventional one in which the tip side of the fixed shaft 6 is inserted into the bearing 8,
It is possible to assemble the stator 5 side to the rotor 4, and at this time, together with the position regulating force of the axial position on the rotor 4 side by the magnetic attraction force acting on the stator 5 from the permanent magnet 20, As described above, the mechanical position regulation with respect to the bearing 8 is also given, and as a result, a more accurate and firm mounting state in which the axial movement of the rotor 4 side is suppressed is provided. .

After the rotor 4 and the stator 5 are assembled to the fan rotor 1 as described above, this assembly is assembled to the indoor unit of the air conditioner. FIG. 9 shows a mounting structure of a side plate (hereinafter, referred to as a left side plate) 51 of the fan rotor 1 on the side opposite to the right side plate 2 to an indoor unit. As shown in the figure, a rotation support shaft 52 is erected at the axial center position of the left side plate 51, and the rotation support shaft 52 is attached to a bearing 54 attached to a left side wall 53 inside the indoor unit. By inserting it, the left side plate 51 side is attached. The bearing 54 is mounted in a bearing outer body 55 press-fitted into a mounting hole of the left side wall 53, and the bearing outer body 55 is made of an elastic material such as synthetic rubber having a vibration isolation function. In addition, a spherical seat is formed inside, and the bearing 54 having a spherical outer peripheral surface is mounted rotatably along the spherical seat.

After mounting on the left side plate 51 side, as shown in FIG. 10,
The right side plate 2 is attached. For this reason, a lower mounting portion 10 for fixing the end bracket 7 is formed on the right end side of the main body frame 9 which constitutes the rear panel of the wall-mounted indoor unit. This lower mounting part 10
A substantially U-shaped fitting groove is formed along the outer peripheral edge of the lower half of the end bracket 7 in the drawing. The lower side of the end bracket 7 is fitted into this fitting groove,
Then, the motor cover 11 having an inverted U-shaped insertion groove that is vertically symmetrical to the insertion groove of the lower mounting portion 10 is fastened to the main body frame 9 with a screw, so that the peripheral portion of the end bracket 7 is completely removed. The end bracket 7 is fixed by being fitted into each of the fitting grooves over the circumference and being pressed by a screw fastening direction, that is, a vertical pressing force.

After the above assembling, for example, in FIG. 10, an indoor heat exchanger (not shown) is arranged on the upstream side of the fan rotor 1, that is, on the upper right side in the figure, and the lower mounting portion 10 is further installed.
An indoor control device (not shown) is stored on the upper right side of the
After electrical wiring is made between the indoor control device and the terminals on the circuit board 24, a front panel (not shown) is attached to the main body frame 9 to complete the assembly of the indoor unit.

As described above, in the above embodiment, the stator 5 side is assembled by a very simple operation of inserting the tip side of the fixed shaft 6 into the bearing 8 mounted at the axial center position of the rotor 4. Since the bearing 8 is provided with a mechanical holding force that restricts axial movement with respect to the fixed shaft 6, for example, an axial moving force is generated in the bearing 8 when the fan rotor 1 is rotationally driven. Even in such a case, the movement is blocked, and as a result, it is possible to prevent the generation of noise that has been conventionally generated. Further, rattling due to axial movement of the fan rotor 1 during transportation is also prevented. Further, in the above-mentioned embodiment, the bearing fixing member 40 is configured to be fixed in the axial direction only by being fitted from the side of the fixed shaft 6, and a screw part or the like for fixing the bearing fixing member is not necessary. In addition, since no separate component other than the above-mentioned bearing fixing member 40 is required, the assembly is easy and the manufacturing cost can be reduced. Further, in the above embodiment, the bearing fixing member 40 can also fix the stator 5 to the fixed shaft 6, and as a result, conventionally, the stator is axially fixed by, for example, adhesion. The work time is shortened and the work efficiency can be significantly improved as compared with the case of the above.

The above embodiment is not intended to limit the present invention, and various modifications can be made within the scope of the present invention. For example, in the above embodiment, an example in which the recess provided in the fixed shaft 6 is formed as the annular groove 33 As described above, other concavo-convex fitting structure is adopted, for example, the fixing shaft 6 is provided with a hole that is recessed in the radial direction, and the bearing fixing member 40 side is provided with a pin-shaped projection that fits into the hole. It is possible to configure it. Further, although the example in which the middle portion of the flexible portion 43 is formed in a dogleg shape to form the position regulating portion 44 has been described, it is also possible to have another shape such as an arc shape. Further, the above is an explanation of an example applied to a fan motor structure of a DC brushless motor type connected to a fan rotor of a cross flow fan, but the present invention can be applied to a bearing mounting structure in other devices. .

(Effects of the Invention) As described above, in the bearing mounting structure of the present invention, the movement to the free end side with respect to the above-mentioned bearing can be performed by a simple work of simply inserting the bearing into the free end side tip portion of the fixed shaft. Since a mechanical restricting force for restricting is applied, for example, when applied to a fan motor of a DC brushless motor type connected to the above-mentioned cross flow fan, the assembling workability is not impaired. Moreover, it is possible to reduce noise when the fan rotor is rotationally driven.

[Brief description of drawings]

1 to 10 are explanatory views in an embodiment of the present invention, and FIG. 1 is a right side plate side of a fan rotor in a cross flow fan connected with a fan motor configured by applying the present invention. FIG. 2 is a sectional view showing the structure, FIG. 2 is an explanatory view of the process of inserting the fixed shaft into the bearing, FIG. 3 is an exploded perspective view of the right side plate side of the fan rotor, and FIGS. 4 and 5 show power transistors, respectively. FIG. 6 and FIG. 7 are perspective views of a clip spring used for tightly holding the end bracket, and FIGS. 6 and 7 are explanatory views of a state in which the clip spring is tightly held by the clip springs. FIG. 8 shows a stator and a bearing fixing member for a fixed shaft. And FIG. 9 is a cross-sectional view showing the mounting structure on the left side plate side of the fan rotor, and FIG. 10 is an explanatory view of the mounting on the right side plate side,
FIG. 11 is a sectional view of a conventional device. 6: fixed shaft, 8: bearing, 33: annular groove (recess), 38
...... Concave groove, 40 ...... Bearing fixing member, 41 ...... Fixing part, 43 ...
… Flexible part, 44 …… Position control part.

Claims (1)

[Scope of utility model registration request] 1. A bearing mounting structure in which a bearing (8) is externally fitted to the free end side of a fixed shaft (6), said fixed shaft (6).
A groove (33) is formed in the middle thereof, and a groove (38) extending in the axial direction is formed on the outer circumference of the free end side tip end portion having a diameter substantially the same as the inner peripheral surface of the bearing (8). , A fixed part whose movement in the axial direction is restricted by fitting in the recess (33)
(41) and a flexible portion (43) extending from the fixed portion (41) toward the tip side along the recessed groove (38) and elastically deformable in the recessed groove (38) in the radial direction. A bearing fixing member (40) having a groove (3) is provided, and the axially intermediate portion of the flexible portion (43) is connected to the tip portion located in the recessed groove (38) and the recessed groove (3).
8) Forming a position control part (44) that projects more radially outward than
The fitting position of the bearing (8) from the tip of the fixed shaft (6) is pressed by the inner peripheral surface of the bearing (8) and the concave groove (3
8) When it reaches a position beyond the position regulating part (44) buried in the inside, the position regulating part (44) that comes into contact with the corner portion of the end face of the bearing (8) is moved outward in the radial direction. A bearing mounting structure characterized in that the elastic return force of the flexible portion (43) to be returned is configured to restrict the movement of the bearing (8) toward the tip side.