JPH0453174Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a small motor used as a power source for paper feeding in electronic copying machines and facsimile machines.

[Conventional technology]

FIGS. 6 and 7 show an example of a conventional pulse-driven small motor. In the figure, reference numeral 1 denotes a motor case formed by connecting a pair of motor case members 1a and 1a by welding, and a stator and a rotor (not shown) are housed inside the motor case, and the rotating shaft 2 of the rotor is attached to one motor case member 1a. It passes through the attached bearing 3. Further, a diamond-shaped motor mounting plate 4 is fixed by welding to the motor case member 1a on the side from which the rotating shaft 2 protrudes. This mounting plate 4 is larger than the motor case 1, and has fixing holes 5 provided at both ends thereof, and a plurality of positioning holes 6 between these fixing holes 5, 5. Note that 7 in the figure indicates a lead wire. Then, this small motor is mounted on the mounting part (not shown) by stacking the motor mounting plate 4 on the mounting part (not shown) and attaching the motor to the mounting part via screws passing through the fixing holes 5. 6, the motor can be positioned accurately regardless of the play between the fixing hole 5 and the screw passing through it.

Further, FIG. 8 shows another example of the conventional pulse drive type small motor. The motor case shown at 11 in the figure has a pair of left and right mounting flanges 1 on the opening edge.
A flat motor case member 14 is caulked to a bottomed cylindrical motor case member 13 formed by integrally extending the motor case member 13 with its opening closed. This motor case 11 has a built-in stator and rotor (not shown), and the rotor's rotating shaft 15
is passed through the bearing 16 attached to the flat plate-shaped motor case member 14, and is attached to the mounting flange 1.
2 are each provided with a fixing hole 17. Note that 18 in the figure indicates a lead wire. This small motor is configured such that the mounting flange 12 is stacked on a mounting portion (not shown) and is mounted to the mounting portion via a screw passing through a fixing hole 17.

[Problem that the invention attempts to solve]

However, in the conventional motor shown in FIGS. 6 and 7, in addition to the motor case 1 consisting of a pair of motor case members 1a and 1a, there is also a motor for accurately positioning and mounting the motor with respect to the mounting part. Since the mounting plate 4 is required and welding is required, there is a problem in that the cost is high. In addition, in the conventional motor shown in FIG. 8, since it is not possible to position the motor when it is attached to the mounting part, rotation due to play between the fixing hole 17 and the screw passing through it is a problem. There were problems in that the shaft 15 was misaligned and the lead wire 18 was pulled out in a circumferential direction of the motor case 11. Furthermore, if there is a misalignment as described above in a small motor, proper meshing will not be obtained, for example, when the rotation of the rotating shaft is transmitted using gears (which are naturally small since they are for small motors). In addition, if the lead wire is misaligned, it is not possible to strictly determine the minimum length, and it is necessary to ensure that the lead wire has a sufficient length so that it can be connected to the printed circuit board, etc. regardless of the misalignment. must be taken.

[Means for solving problems]

The present invention provides a bottomed cylindrical motor that is open at one end and integrally includes a mounting flange that extends outward from the edge of the opening and is stacked on the motor mounting portion, and that houses a stator and a rotor therein. In a small motor equipped with a motor case consisting of a case member and a flat motor case member that closes the opening and is caulked to the motor case member, the flat motor case member is attached to the bottom of the mounting flange. In addition, the flat motor case member has a protrusion that protrudes toward the motor mounting portion and is located closer to the bottom than the overlapping surface of the mounting flange to the motor mounting portion. By integrally providing a plurality of positioning protrusions with different heights, and providing a through hole approximately in the center of each of these positioning protrusions into which the protruding engagement part provided on the motor mounting part fits and engages, the above-mentioned This solves the conventional problems.

[Effect]

In the small motor of the present invention, since the motor case is constructed by caulking a flat motor case member to a bottomed cylindrical motor case member, troublesome welding is not required when assembling the motor case. In addition, since the mounting flange is integrally provided on the bottomed cylindrical motor case member, the motor case can be formed with the minimum number of two members, and there is no need for any troublesome welding when installing the flange. There is no such thing as Therefore, the motor can be made inexpensive and small. When installing this small motor, the protruding engaging portions provided on the motor mounting portion of the device are inserted into the through holes of the plurality of positioning protrusions provided integrally on the flat motor case member. By engaging them, the position of the rotor rotating shaft and the lead wire pulling-out position can be accurately positioned regardless of the play between the fixing hole of the mounting flange and the fixing tool passing therethrough. Moreover, in the above positioning, the flat motor case member is provided with a position shifted to the bottom side of the bottomed cylindrical motor case member from the mounting flange of the motor case member, and the positioning convex portion is provided within the range of the positional shift. Since the protruding engaging part of the motor mounting part is inserted into the through hole of the protruding part toward the motor mounting part and engaged with the protruding part of the motor mounting part, even though the thickness of the flat motor case member is thin, the engagement part and A large amount of engagement (engaging depth) with the positioning convex portion can be ensured, and the reliability of positioning is high. Furthermore, since the positioning protrusion provided as described above does not protrude beyond the mounting flange of the bottomed cylindrical motor case member, other objects may not be attached to the positioning protrusion when handling the motor alone. There is little chance that this convex part will be deformed by contact with the
Therefore, the above positioning can be performed reliably.

〔Example〕

Figures 1 to 3 showing an embodiment of the present invention.
Reference numeral 1 denotes a motor case made of a steel plate, which has an open end and a bottomed cylindrical motor case member 23 integrally equipped with a pair of mounting flanges 22 extending outward from the edge of the opening. , this member 23
A flat motor case member 24 is provided to cover the opening of the motor case member 24. A lead wire passage groove 25 is cut out and formed in the circumference of the motor case member 23, and fixing holes 26 are provided at the distal end side of the mounting flange 22, respectively.

Then, the flat motor case member 24
is located closer to the bottom of the motor case member 23 than the mounting flange 22, and
The shifted motor case member 24 is connected to the motor case member 23 by caulking four opening edges of the motor case member 23. In addition, 27 in Figures 2 and 3
indicate the caulked portions.

In addition, the above motor case 21 includes a stator 2.
8 and a rotor 29 are built in, respectively. Lead wires 30 connected to the windings of the stator 29 are brought out of the motor case 21 through the lead wire passage grooves 25. One end of the rotor rotation shaft 29a is supported by a bearing 31 attached to the bottom of the motor case member 23, and the other end of the rotor rotation shaft 29a is supported by a bearing 31 attached to the bottom of the motor case member 23.
It is supported through a bearing 32 attached to the center of 4.

Further, the flat motor case member 24 has a through hole 33 protruding toward the motor mounting portion A of the equipment (electronic copying machine, facsimile, etc.) on which the mounting flange 22 overlaps, and approximately in the center thereof. , and the plurality of positioning convex portions 34 that engage with the protrusion-like engaging portions B provided on the mounting portion A are integrally formed at a point-symmetric position centered on the rotor rotating shaft 29a positioned by the bearing 32, for example. It is set in. Note that in this embodiment, the engaging portion B
Since the positioning projection 34 is a short projection with a circular cross section, an example is shown in which the positioning projection 34 is formed by a cylindrical projection. Further, reference numeral 35 in FIG. 1 indicates a fixture for the motor, such as a screw.

In order to attach the above-mentioned small motor to a predetermined attachment part A of a device, the motor is arranged so that the attachment flange 22 of the motor case 21 overlaps with this motor attachment part A, and at this time, each position of the motor is adjusted. The convex portions 34 are engaged with the engaging portions B of the motor mounting portion A, respectively. This results in
The rotor rotating shaft 29a can be accurately positioned with respect to the motor mounting portion A, and the position of the lead wire passing groove 25, that is, the position of the lead wire 30 that applies input pulses to the stator 28 can be accurately positioned. . Next, the screw 35 is passed through the fixing hole 26 of the mounting flange 22 and screwed into the screw hole C of the motor mounting part A, thereby completing the mounting of the motor to the motor mounting part A. In the above installation, the flat motor case member 2
Although the thickness of the plate 4 is thin, a large amount of engagement (engaging depth) between the engaging portion B and the positioning convex portion 34 can be ensured. In this respect, as described above, the flat motor case member 24 is different from the bottomed cylindrical motor case member 24.
The same case member 23 than the mounting flange 22 of No. 3
The positioning protrusion 34 is made to protrude toward the motor attachment part A side within the range of the positional deviation, and the protruding engagement part of the motor attachment part A is inserted into the through hole 33. This was achieved by inserting and engaging B. Therefore, the reliability of motor positioning is high. Moreover, the positioning convex portion 34 provided as described above is connected to the bottomed cylindrical motor case member 23.
Since the motor does not protrude beyond the mounting flange 22, there is little possibility that the positioning protrusion 34 will be deformed due to other objects hitting the positioning protrusion 34 when handling the motor alone. Therefore, the above positioning can be performed reliably.

Moreover, as described above, since the flat motor case member 24 is provided at a position shifted from the mounting flange 22 of the bottomed cylindrical motor case member 23 to the bottom side of the case member 23, the central portion thereof A bearing 32 mounted to support the rotor rotation shaft 29a can be provided without protruding from the mounting flange 22. Therefore, bearing 3
2 corresponds to the motor mounting part A, so that the surface contact of the mounting flange 22 to the motor mounting part A is not obstructed, and in order to do so, the rotating shaft through hole D of the motor mounting part A is connected to the bearing 32. There is no need to make it large enough to accommodate. Therefore,
Mutual influence of heat between the motor and the equipment through the rotating shaft through hole D can be reduced.

In the small motor with the above configuration,
Since the motor case 21 is constructed by caulking the flat motor case member 24 to the bottomed cylindrical motor case member 23, troublesome welding is not required when assembling the case 21. Along with this,
Since it has a structure in which the mounting flange 22 is integrally provided with the bottomed cylindrical motor case member 23, the motor case 21 can be formed with the minimum number of two members, and the installation of the mounting flange 22 does not require any troublesome welding. There is no such thing as Therefore,
This can be done with an inexpensive small motor.

Further, the present invention may be implemented using a motor case member 24 shown in FIGS. 4 and 5 instead of the flat motor case shown in the above embodiment.

That is, the motor case member 24 has a configuration in which the positioning convex portion 34 has a protruding end surface 34a having a large area, and a through hole 33 is provided approximately in the center of the protruding end surface 34a. Note that the configuration other than this point is the same as that of the above embodiment.

By using the motor case member 24 having such a configuration, the positioning protrusion 34 can be formed at the same time when the case member 24 is press-molded, so that the dimension of the protrusion height h can be easily controlled. Of course. Along with this, the protruding end surface 34a
Due to the large area of , when engaging the through hole 33 with the engaging part B of the motor mounting part A,
The through hole 33 can be easily engaged with the engaging part B by sliding the protruding end surface 34a from the tip of the engaging part B without suddenly engaging them. Moreover, since the protruding end surface 34a is provided along the circumferential direction as shown, the entire opening on the back side of the positioning convex portion 34 is closed by the stator. For this reason, the motor mounting part A
Even if dirt or the like enters the motor case through the through hole 33 before it is attached to the stator, there is no risk of the dirt entering the gap between the stator and rotor. Incidentally, the protruding end surface 34a may be enlarged along the radial direction, or the through hole 3 may be enlarged.
When increasing concentrically around 3,
Of course, the above-mentioned engagement work is facilitated, but since the stator cannot close the entire opening on the back side of the positioning convex portion 34, the dust passing through the through hole 33 can be disposed between the stator and the rotor. There is a risk of it entering the gap between the two.

In implementing the present invention, the specific structure, shape, position, etc. of the motor case, its motor case members, mounting flanges, positioning protrusions, through holes, etc. shall be as described above, unless it is contrary to the gist of the invention. It goes without saying that the present invention is not limited to each embodiment and can be configured and implemented in various ways.

[Effect of idea]

According to the present invention, the gist of which is the configuration described in the claims for utility model registration, the flat motor case member is shifted to the bottom side of the bottomed cylindrical motor case member rather than the mounting flange of the motor case member. At the same time, the positioning protrusion is made to protrude toward the motor mounting part within the range of the positional deviation, and the protruding engagement part of the motor mounting part is fitted into the through hole and engaged. In order to fit and engage the protruding engagement portions provided on the motor mounting portion of the device into the through holes of the plurality of positioning protrusions integrally protruding from the flat motor case member, Despite the thin plate thickness, it is possible to ensure a large engagement depth between the engagement part and the positioning convex part,
It is said that the positioning reliability is high, and as a result, the position of the rotor rotation axis and the lead wire extraction position can be accurately positioned regardless of the play between the fixing hole of the mounting flange and the fixing device passing through it. In addition, since the positioning protrusion provided as described above does not protrude beyond the mounting flange of the bottomed cylindrical motor case member, the positioning protrusion does not stick to the positioning protrusion when handling the motor alone. There is little possibility that this protrusion will be deformed by hitting other objects, and this positioning is done using a part of the motor case, and the mounting flange for mounting is integrated with the motor case. Therefore, it is not necessary to attach special members for positioning and attaching the motor to the motor case by welding, and there is a practical effect that it can be obtained at low cost.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
Figure 1 is shown with the mounting part in Figure 2.
2 is a perspective view, and FIG. 3 is a side view. 4 and 5 show other aspects of the flat motor case, FIG. 4 is a plan view,
FIG. 5 is a sectional view taken along the line - in FIG. 4.
6 and 7 show a conventional example, with FIG. 6 being a plan view and FIG. 7 being a partially sectional side view. FIG. 8 is a perspective view showing another conventional example. 21...Motor case, 22...Mounting flange, 23, 24...Motor case member, 28...
Stator, 29...Rotor, 33...Through hole, 3
4...Positioning convex portion, 34a...Protruding end surface, A...
...Motor attachment part, B...Engagement part.

Claims (1)

[Claims for Utility Model Registration] (1) One end is open and integrally provided with a mounting flange that extends outward from the edge of this opening and overlaps the motor mounting part, and houses the stator and rotor inside. A small motor including a motor case comprising a bottomed cylindrical motor case member and a flat motor case member that closes the opening and is caulked to the motor case member, the flat motor case member is arranged at a position shifted from the mounting flange to the bottom side, and the flat motor case member has a part that protrudes toward the motor mounting part and is lower than the overlapping surface of the mounting flange to the motor mounting part. A plurality of positioning convex portions with a protruding height located on the bottom side are integrally provided, and a through hole into which a protruding engagement portion provided on the motor mounting portion fits and engages is provided approximately in the center of these positioning convex portions. A small motor characterized by the fact that each motor is provided separately. (2) In the statement of claim 1 of the utility model registration claim, the positioning convex portion has a protruding end surface with a wide area, and the through hole is provided approximately at the center of the protruding end surface. A small motor featuring