JPH0329982Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a motor with a gear device used, for example, to drive a control valve for controlling the amount of refrigerant flow in an air conditioner.

[Conventional technology]

FIG. 9 shows a conventional example. In the figure, reference numeral 1 denotes a pulse motor, which is formed by incorporating a stator and a rotor into a motor frame consisting of a pair of cup-shaped frame members 2a, 2a connected by welding, and protruding from the motor frame. A driving gear 4 is fixed to the rotary shaft 3. Reference numeral 5 denotes a gear device in which a gear mechanism 7 that meshes with the drive gear 4 is attached between a pair of gear support plates 6, 6. 8 is connected to the pulse motor 1. In addition, 5a
indicates the output shaft of the gear device 5. The connecting band 8 is a band-shaped metal plate bent into a substantially U-shape, and is inserted into the support plate 6 by passing both ends 8a through the notches 6a of the gear support plate 6 stacked on the motor frame. The pulse motor 1 and the gear device 5 are connected by the hook and the elastic force of the metal fitting itself. The pulse motor 1 and the gear device 5 connected as described above are housed in a suspended state by hooking the peripheral edge of the gear support plate 6 to the stepped portion 9a of the cup-shaped motor case 9. Further, a plurality of lead wires 10 extending from the circumferential surface of the pulse motor 1 are drawn out from a lead wire outlet 9b provided on the bottom surface of the motor case 9. and,
The lead wire outlet 9b is formed on the bottom surface of the motor case 9, facing the gap G between the motor frame and each peripheral portion of the motor case 9. In addition, 1 in the figure
Reference numeral 1 indicates a cord bush provided to close the lead wire outlet 9b, and reference numeral 12 indicates an adhesively hardened sealing material.

[Problem that the invention attempts to solve]

However, according to the conventional structure as described above, the lead wire outlet 9b is provided facing the gap G, but since this outlet 9b is formed by press working, the part sandwiched between the molds is A (see FIG. 9) is always required between the lead wire outlet 9b and the circumference of the motor case 9 on the bottom surface of the motor case 9. In addition, since the cord bush 11 for protecting the lead wire 10 is fitted into the lead wire outlet 9b, the lead wire outlet 9b cannot be made small. Due to these circumstances, the conventional arrangement structure of the lead wire outlet 9b has a problem in that the outer diameter of the motor case 9, that is, the entire motor is large.

[Means for solving problems]

The present invention provides a motor with a gear device that includes a pulse motor, a gear device connected to a motor frame provided with the pulse motor, and a cup-shaped motor case that houses the pulse motor and the gear device. In order to solve the conventional problems and also gain flexibility in designing the lead wire pull-out position, the motor frame is replaced with a first frame having a cylindrical shape with a bottom and whose open end touches the bottom surface of the motor case. A member is located slightly on the bottom side of the opening end of this member and is provided to cover the opening of the first frame member, and has a wire passage space between it and the bottom surface of the motor case.
a second frame member forming a second frame member, the first frame member is provided with a wire passage groove from its open end, and a lead wire outlet located inside the first frame member is provided on the bottom surface of the motor case. is provided, and a plurality of lead wires taken out from the circumference of the first frame member are drawn out of the motor case through the lead wire outlet via the wire passage groove and the wire passage hole. .

[Effect]

In the motor with a gear device equipped with the above-mentioned solution, the lead wires taken out from the periphery of the motor frame of the pulse motor pass through the wire passage grooves from the periphery-side gaps between the motor frame and each periphery of the motor case.
A lead wire is provided on the bottom surface of the motor case via a wiring hole between the bottom surface of the motor case and the second frame member of the motor frame opposite thereto, and located inside the first frame member of the motor frame. It is pulled out from the outlet to the outside of the motor case. According to the above structure, the lead wire outlet is provided closer to the inside of the gap without facing the gap on the circumferential side, so that the gap on the circumferential side is narrowed or eliminated. Therefore, the outer diameter of the motor case can be reduced, and the entire motor can be made smaller.
Moreover, the above miniaturization can be achieved by providing the lead wire outlet anywhere on the bottom surface of the motor frame as long as it is inside the first frame member, so the degree of freedom in designing the lead wire extraction position is increased, and the lead wire exit can be arbitrarily determined.

〔Example〕

The small motor indicated by the reference numeral 21 in FIGS. 1 to 3 showing one embodiment is a PM type pulse motor 22.
, a gear device 23 , and a motor case 24 .

The pulse motor 22 has a stator attached to a motor frame 27 consisting of a bottomed cylindrical first frame member 25 made of steel plate, and a flat plate-shaped second frame member 26 made of steel plate which is caulked to close the opening of this member 25. 28 and a rotor 29, respectively. The second frame member 26 is located slightly closer to the bottom than the open end of the first frame member 25. A wire passage hole 50 is formed between the second frame member 26 and the bottom surface of the motor case 24. Reference numeral 25a in FIGS. 2 and 3 indicates a caulking portion of the first frame member 25. As shown in FIG. Note that the stator 28 has a winding frame around which the winding wires are wound.
A pair of yokes having comb-toothed salient poles on the inner peripheral side are fitted so as to sandwich this, and the comb-toothed salient poles of both yokes are inserted alternately. Further, the rotor 29 has a magnet portion which is alternately magnetized with north poles and south poles along the axial direction.

A long hole 30 along the axial direction is formed in the circumference of the motor frame 27.
A plurality of lead wires 31 connected to the stator 28 are drawn out from. Furthermore, the motor frame 27 has a wire passage groove 32 cut out from its open end.
is formed. The wire passage groove 32 is formed to have a width that allows the lead wires 31 to be lined up in one row, and the lead wires 31 are passed through the wire groove 32 in a line. Moreover, motor frame 2
A stopper ridge 33 is provided at the open end of 7 and integrally extends outward.

The rotary shaft 34 to which the rotor 29 is fixed is a second
It is supported by bearings 35 and 36 fixed to the frame member 26 and the bottom 25a of the first frame member 25 facing thereto, respectively. And bearing 36
protrudes outward from the bottom portion 25a, and passes through the bearing 36 to connect to the motor case 27.
A driving gear 37 having a smaller diameter than the protruding portion of the bearing 36 is fixed to the end of the rotating shaft 34 that protrudes outward. Furthermore, the bottom 2 of the motor case 27
An engagement recess 38 consisting of a long hole or the like is formed in 5a.

The gear device 23 is formed by attaching a gear mechanism 41 that meshes with the drive gear 37 between two opposing steel gear support plates 39 and 40.
Note that 23a is a connecting rod that connects both support plates 39 and 40 in parallel. Needless to say, the gear mechanism 41 is made up of a plurality of gears meshing with each other, and in this embodiment is a reduction gear train, the final gear of which is connected to an output shaft 42 located on the outer surface side of the gear support plate 39. has been done. The output shaft 42 is connected to a suitable driven body, such as a flow rate control valve. The gear support plate 40 of the gear device 23 has the bearing 36 located approximately in the center thereof.
A fitting hole 43 is provided that fits exactly into the protruding portion, and an engagement protrusion 44 that engages with the engagement recess 38 is provided.

The gear device 23 having the above structure is constructed by fitting the protruding portion of the bearing 36 into the fitting hole 43 of the gear support plate 40 and engaging the engaging protrusion 44 with the engaging recess 38. , is overlapped with the bottom part 25a of the motor frame 27, and is bonded to the bottom part 25a and the gear support plate 40 with an adhesive (not shown),
It is connected to the pulse motor 22 mentioned above.

Pulse motor 22 connected as above
The assembly of the motor and the gear device 23 is housed in the motor case 24, which is formed by pressing a steel plate into a cup shape. In addition, 24a in FIG. 1 is the motor case 2.
This is a retaining edge with the opening 4 bent inward. Further, a lead wire outlet 45 is formed inside the first frame member 25 at the bottom of the motor case 24 where the open end of the motor frame 27 contacts, and the lead wire 31 is passed through the outlet 45. It is pulled out of the motor case 24. As shown by the two-dot chain line in FIG. 2, the lead wire outlet 45 is formed in a size that allows the lead wires 31 to be arranged in one row. Note that 46 connects the lead wire 31 to 1
Rubber cord bushes 4 arranged in rows and passed through and blocking the lead wire outlet 45;
Reference numeral 7 designates a sealing material adhesively hardened to the lead wire outlet 45, and reference numeral 48 designates a pair of detents (only one of which is shown) that is provided integrally with the motor case 24 and engages on both sides of the stopper flange 33.

To assemble the motor 21 with the gear device configured as described above, first, the bottom 25a of the pulse motor 22 is assembled.
and the bearing support plate 36 of the gear device 23 which is stacked thereon are connected by an adhesive. In this case, radial positioning is achieved by fitting the protruding portion of the bearing 36 protruding outside the motor frame 27 of the pulse motor 22 into the fitting hole 43 of the gear support plate 40.
Proper meshing between the drive gear 37 and the input gear of the gear mechanism 41 is ensured, and the engaging protrusion 4
4 and the engagement recess 38, the gear device 23
is positioned circumferentially. Therefore, since the pulse motor 22 and the gear device 23 are bonded together in this way, and the engagement protrusion 44 and the engagement recess 38 are engaged, the output of the gear device 23 is reduced. When a load is applied to the shaft 42, movement along the circumferential direction between the pulse motor 22 and the gear device 23 can be prevented. Therefore, when one pulse is applied to the stator 28 during operation of the pulse motor 22, the output This prevents the rotation angle scheduled for the shaft 42 from going out of order.

Next, the lead wires 31 of the pulse motor 22 to which the gear device 23 is connected in the above manner are lined up in a line from the periphery of the motor frame 27 through the wire passage grooves 32 and along the second frame member 26. Do it like this. The lead wires 31 are passed through the cord bushing 46 in advance, and may be temporarily fixed with adhesive tape or the like to maintain the lead wires 31 in the above-mentioned wiring state if necessary during the above-mentioned wiring. After passing the leading end of the lead wire 31 through the lead wire outlet 45 of the motor case 24, the pulse motor 22 in the above state is moved into the motor case until the open end of the first frame member 25 hits the bottom of the motor case 24. 24, and the stopper protrusion 33 and the rotation stopper 48 are engaged.
As a result, the wire passage groove 32 is arranged at a fixed position with respect to the lead wire outlet 45, and a wire passage groove in which the lead wire 31 is wired between the second frame member 26 and the bottom surface of the motor case 24 is formed. 50 are formed. In this state, the cord bushing 46 is tightly fitted into the lead wire outlet 45 by pulling the lead wire 31 outside the motor case 24, and then the sealing material 47 is filled into the cord wire outlet 45 from the outside.

Finally, the opening of the motor case 24 is bent to engage the retaining edge 24a with the gear support plate 39, completing the assembly.

According to the structure of the motor with a gear device as described above, the lead wire outlet 45 does not face the peripheral side gap g between the motor case 24 and the motor frame 17, but is provided closer to the inside of this gap g. Therefore, the outer diameter of the motor case 24 can be reduced by narrowing the circumferential gap g, and the entire motor can be made smaller. Moreover, the lead wire outlet 45 can be placed anywhere on the bottom surface of the motor frame as long as it is inside the first frame member 25 to achieve the above-mentioned size reduction, so the degree of freedom in designing the lead wire extraction position can be increased. The position of the lead wire outlet 45 can be determined arbitrarily.

Further, in this embodiment, since the plurality of lead wires 31 are arranged to pass through the wire passage groove 32 and the lead wire outlet 45 in a line, the height of the wire passage hole 50 shown by the dimension h in FIG. By shortening the dimensions, the overall size can be reduced.

Next, regarding another embodiment that is more compact, only the parts that are different from the above embodiment will be explained, and the same parts as the above embodiment will be given the same reference numerals and explained. omitted.

In other words, the embodiment shown in FIGS. 4 and 5 is
A plurality of lead wires 31 from the pulse motor 22 are arranged in a line as shown in FIG.
It is taken out from the motor case 24.
In order to do this, the second frame member 26 is connected to the first frame member 25 so that there is no partition between the elongated hole 30 and the wire groove 32. and the wire passage groove 32 are continuous. Further, the stopper protrusion edge 33 that is engaged with the detent portion 48 extends inwardly of the motor frame 27 integrally. With the above structure, the motor case 24 can be provided so as to be in contact with the peripheral portion of the motor frame 27, and therefore, the overall shape can be further reduced in size.

Although each of the above embodiments is constructed as described above, the cord bush 46 may have a stepped shape as shown in FIG. Since the cord bushing 46 is fitted into the lead wire outlet 45 as shown in FIG. 7, the sealing material 47 can be easily applied and the sealing performance of the lead wire outlet 45 can be improved.

Furthermore, the cord bush 46 may have a groove 46a as shown in FIG. 8. When using this cord bush 46, it is easy to attach to the lead wire and can be retrofitted if necessary.
The elasticity of No. 6 makes it possible to obtain good adhesion between the lead wire outlet and the lead wire.

Although each of the above-mentioned embodiments is constructed as described above, in implementing the present invention, unless it goes against the gist of the invention, the pulse motor, motor frame and its frame members, wire grooves, gear devices, motor It goes without saying that the specific structure, shape, position, etc. of the case, lead wire outlet, lead wire, etc. are not limited to the above embodiments, and can be configured and implemented in various ways.

[Effect of idea]

According to the present invention, the gist of which is the structure described in the scope of the above utility model registration claims, the diameter of the cup-shaped motor case that houses the pulse motor and the gear device can be reduced to make the whole smaller, and the lead wire This has the practical effect of increasing the degree of freedom in setting the exit position.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
FIG. 1 is a longitudinal side view, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1, and FIG. 3 is a side view of the pulse motor. 4 and 5 show other embodiments of the present invention, in which FIG. 4 is a longitudinal sectional side view and FIG. 5 is a sectional view taken along the line - in FIG. 4. FIG. 6 is a perspective view showing another example of the cord bushing, and FIG. 7 is a sectional view showing the usage state of the cord bushing shown in FIG. 6. FIG. 8 is a perspective view showing still another cord bush. FIG. 9 is a partially sectional side view of a conventional example. 22... Pulse motor, 23... Gear device, 2
4... Motor case, 25... First frame member, 26... Second frame member, 27... Motor frame, 31... Lead wire, 32... Wiring groove,
45... Lead line exit, 50... Line empty.

Claims (1)

[Claims for Utility Model Registration] (1) A gear consisting of a pulse motor, a gear device connected to a motor frame provided with the pulse motor, and a cup-shaped motor case that houses the pulse motor and the gear device. In the motor with the device, the motor frame has a bottomed cylindrical shape and an open end thereof is in contact with the bottom surface of the motor case.
a frame member, a second frame member that is located slightly on the bottom side of the open end of the frame member, is provided to cover the opening of the first frame member, and forms a wire passage space between the frame member and the bottom surface of the motor case; The first frame member is provided with a wire passage groove from its open end, and the bottom surface of the motor case is provided with a lead wire outlet located inside the first frame member. Connect multiple lead wires coming out from the circumference of the member.
A motor with a gear device characterized in that the lead wire is drawn out of the motor case through the lead wire outlet via the wire passage groove and the wire passage hole. (2) In the statement of claim (1) of the utility model registration claim, the wire passage groove and the lead wire outlet are both formed to a size that allows the lead wires to be arranged in one row. Motor with gearing.