JP2001248695A - Change gear-integrated motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembly of a change gear-integrated motor by reducing its parts items. SOLUTION: A front wall 4 and a rear wall 5 are caulked onto opposite ends of a housing 3 to form a motor case 2, and a rotor shaft 11 is supported on bearings 17 and 18. A bottomed cylindrical gear case 20 is arranged to form a closed space R with the front wall 4, and the end of the rotor shaft projecting into the closed space is mounted with an input gear 19. An output shaft 30 with an output gear 31 in the closed space is supported on a main bearing 23 on a bottom wall 21 of the gear case so as to extend outward. A gear 27 supported on a shaft 25 mounted on the front wall transmits the rotation of the input gear to the output gear after speed reduction. The front wall and gear case commonly constitute a gear shaft support member to simplify the structure. The integration of motor parts into the housing, the fixation of the front wall, and the arrangement of the shafts, reduction gear and gear case can be sequentially carried out from the same direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission-integrated motor having a transmission gear mechanism.

[0002]

2. Description of the Related Art A transmission-integrated motor in which a transmission gear mechanism for reducing the rotation of a rotor shaft or the like is integrally mounted on one end of a motor corresponding to the rotation and torque regions, respectively, so as to be applicable to various use environments. Many have been put to practical use. FIG. 5 shows an example of such a transmission-integrated motor.

[0003] First, in the motor M1, a magnet 42 is installed on the inner peripheral wall of a motor case 40, and the rotor 10 is mounted on the front wall 41 and the rear wall 5 fixed to the rear end of the motor case 40 via bearings 17 and 18, respectively. I support. In the rotor 10, a core 12 is attached to a rotor shaft 11, and a coil 13 is wound around the core. The rotor shaft 11 penetrates the front wall 41, and the input gear 19 is fixed to the front end thereof.

In the transmission gear mechanism, a spacer 43 is mounted on a front wall 41 of a motor case with bolts 48, and a cylindrical gear case 45 having a bottom has a spacer 4 with an open end.
3 and is attached to the spacer. A reduction gear mechanism G1 as a transmission gear mechanism is housed in the gear case 45, and the output shaft 55 and its main bearing 23 project from the bottom wall 46 of the gear case.

The reduction gear mechanism G1 includes an upper base plate 51 and a base plate 52 as base members held at predetermined intervals by a plurality of shafts 53. A main bearing 23 having an output shaft 55 penetrated therethrough is provided on the upper base plate 51, and a shaft end bearing 24 for supporting the rear end of the output shaft 55 at a position facing the main bearing 23 is provided on the base plate 52.
Is provided.

In the space between the upper base plate 51 and the base plate 52, the output shaft 31 is provided with the output gear 31 and the plurality of shafts 53 are provided with the upper base plate 51 and the base plate 52.
Gears 27 having a predetermined reduction gear ratio are sequentially rotatably supported, including a gear meshing with the input gear 19 at the front end of the rotor shaft 11 facing the space between the gears. A plurality of pipes 57 are provided between the upper base plate 51 and the base plate 52 so as to penetrate therebetween. The gear case 45 is configured such that the reduction gear mechanism G1 is disposed between the spacer 43 and the bottom wall 46 by screwing a bolt 58 extending to the spacer 43 through the bottom wall 46 and the pipe 57 into the screw hole 44 of the spacer 43. It is fixed to the spacer 43 by being pushed and sandwiched. The main bearing 23 passes through a bearing window 47 of the gear case 45 and protrudes from the bottom wall 46.

In assembling the transmission-integrated motor, first, the magnet 42 and the rotor 1 are opened from the open end of the motor case 40 in which the bearing 17 is mounted on the front wall 41.
Then, the rear wall 5 is attached and fixed.
Then, the spacer 43 is attached to the front wall 41 of the motor case with a plurality of bolts 48 for the reduction gear mechanism G1.

On the other hand, the main bearing 23 of the reduction gear mechanism G1 assembled in advance as a unit is passed through the bearing window 47 of the gear case 45, and the pipe 57 of the reduction gear mechanism G1 and the through hole 49 of the gear case 45 are aligned so that both are aligned. Pass the bolt 58 in between. Then, the temporary assembly of the gear case 45 and the reduction gear mechanism G1 is
3 and screw the bolt 58 into the screw hole 44 of the spacer. Thus, the gear case 45 accommodating the reduction gear mechanism G1 and the motor M1 are coupled via the spacer 43.

[0009]

In the transmission-integrated motor shown in FIG. 5, as shown in FIG. 5, the front wall 41 of the motor case, the spacer 43, and the base plate 52 of the reduction gear mechanism have three sheets. The spacer 43 is first attached to the front wall 41 with bolts 48, and then the base plate 52 must be pressed and joined to the spacer 43 with bolts 58 via a gear case. However, there is a problem that it takes time. Also, the direction of assembling the components into the motor case 40 of the motor M1 is different from the direction of assembling the reduction gear mechanism G1 to the motor,
It is necessary to assemble the reduction gear mechanism G1 as a unit in advance, and the setup in the entire assembly is not easy.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a transmission-integrated motor having a transmission gear mechanism in which the number of components is reduced and assembly is easy, in view of the above problems.

[0011]

According to a first aspect of the present invention, there is provided a transmission-integrated motor having a transmission gear mechanism at an axial end of the motor, wherein a rotor shaft is penetrated through an end wall of a motor case. A bearing for mounting is mounted, a bottomed cylindrical gear case forming a closed space with the end wall is mounted on the end wall, and an input gear is provided at an end of the rotor shaft protruding into the closed space from the end wall. Attached,
One end of an output shaft provided with an output gear in a closed space is supported by a main bearing provided on a bottom wall of a gear case and extends outward, and a transmission gear interposed between an input gear and an output gear in the closed space. Is rotatably mounted on the end wall, and the input gear, the transmission gear, and the output gear form a transmission gear mechanism. Since the end wall of the motor case also functions as the base member of the transmission gear mechanism and the mounting member of the gear case, the number of parts is reduced, and the cost is also reduced.

According to a second aspect of the present invention, the motor case includes a housing having a cylindrical portion and an end wall fixed to at least one open end of the housing. Since the separate end wall can be made thicker without being limited by the housing which may be relatively thin, the rigidity of fixing the shaft supporting the transmission gear and the rigidity of mounting the gear case can be increased.
In addition, the installation of the motor parts in the housing, the fixing of the end wall, the mounting of the shaft and the transmission gear, and the mounting of the gear case can be sequentially performed from the same direction, so that the assembly setup is easy and the number of assembly steps is reduced. In addition, a shaft can be attached to the end wall before fixing to the housing.

According to a third aspect of the present invention, the tip of a shaft attached to the end wall of the motor case contacts the bottom wall of the gear case to regulate the distance between the end wall and the bottom wall. The case was attached to the outer periphery of the end of the case and attached to the end wall by a bolt penetrating the bottom wall. Since the shaft regulates the space between the end wall and the bottom wall and stretches, the gear case can be easily mounted simply by screwing a bolt penetrating the bottom wall into the end wall.

According to a fourth aspect of the present invention, the end wall of the motor case is formed with a circumferential ridge on the outer peripheral surface thereof, and the housing is fixed by bringing the end edge of the housing into contact with one side surface of the ridge. The open end was in contact with the other side surface of the ridge, and was attached to the end wall by a bolt penetrating the bottom wall. Since the open end of the gear case is mounted in contact with the protrusion on the end wall of the motor case, the mounting rigidity is improved.
Further, since the gear case and the housing are brought into contact with the ridge from both directions, the outer diameters of the gear case and the motor case can be made equal.

According to a fifth aspect of the present invention, a shaft end bearing for supporting the other end of the output shaft is provided on the end wall of the motor case in correspondence with the main bearing. In addition to the fact that the main bearing is provided on the gear case without the need for an upper base plate as in the conventional case, the base plate is not required when the shaft end bearing of the output shaft is provided, so that the configuration can be easily suppressed. In the invention of claim 6, the resin magnet in which the circumferential portion and the magnetic pole portion projecting inward from the circumferential portion are integrally formed,
Both ends of the circumferential portion are sandwiched between the above-mentioned end wall and another end wall facing the end wall, and are installed on the inner periphery of the motor case to constitute a motor. The material cost of the magnet is reduced, and no adhesive or parts are required for mounting the magnet, and there is no dropout.

[0016]

Embodiments of the present invention will be described below with reference to examples. FIG. 1 is a cross-sectional view showing the configuration of the embodiment,
FIG. 2 is an exploded perspective view. The transmission-integrated motor 1 of the embodiment includes a motor case 2 in which a motor M is formed, and a gear case 20 in which a reduction gear mechanism G as a transmission gear mechanism is housed. The motor case 2 is formed by a housing 3 having a cylindrical shape, and a front wall 4 and a rear wall 5 fixed to an opening end thereof. Front wall 4 and rear wall 5
Are small pieces 37 formed at a plurality of positions in the circumferential direction.
Is fixed by swaging. On the inner periphery of the motor case 2, a resin magnet 7 integrally formed with a circumferential portion 8 and a magnetic pole portion 9 protruding inward from the circumferential portion has both ends of the circumferential portion 8 at the front wall 4 and at the rear. It is set between the walls 5.

The rotor 10 has a rotor shaft 11 mounted on a front wall 4 and a rear wall 5 of a bearing 1 mounted on a rear wall 5, respectively.
7 and 18 are supported. A core 12 is attached to the rotor shaft 11 corresponding to the magnetic pole portion 9 of the resin magnet 7, and a coil 13 is wound around the core 12. A commutator 14 connected to the coil 13 is provided on the rear end side of the rotor shaft 11, and a brush 15 that slides on the commutator 14 is provided on the rear wall 5. The rotor shaft 11 penetrates through the front wall 4, and an input gear 19 is fixed to a front end thereof.

A plurality of outwardly extending shafts 25 are respectively press-fitted into holes 26 formed in the front wall 4 and fixed to the outer surface of the front wall 4. Gears 27 (27a, 27b,...) Having a predetermined reduction gear ratio are sequentially rotatably supported on these shafts 25, and are provided between the input gear 19 at the front end of the rotor shaft 11 and an output gear 31 described later. The rotation of the motor is reduced. Covering these gear groups, a bottomed cylindrical gear case 20 is coupled to the front wall 4 with its open end covered by the motor case 2 to form a closed space R with the front wall.

A main bearing 23 through which the output shaft 30 penetrates is fixed to the bottom wall 21 of the gear case 20, and a rear end of the output shaft 30 supported by the main bearing 23 is provided on the front wall 4 so as to face the main bearing 23. Supported by the shaft end bearing 24 provided. The output gear 31 provided on the output shaft 30 meshes with the final stage of the gear 27 supported on the shaft 25 of the front wall 4. In this manner, the reduction gear mechanism G is formed by the input gear 19, the gear 27, and the output gear 31, and the rotation speed of the rotor shaft 11 can be reduced to about 1/1000 from the input gear 19 to the output gear 31 by, for example, six steps of reduction. it can.

The gear case 20 is attached and fixed by screwing the bolt into a screw hole 33 of the front wall 4 with a bolt 32 extending through the bottom wall 21 to the front wall 4 of the motor case 2. In this state, the tips of the plurality of shafts 25 are received and abutted in receiving holes 28 formed in the bottom wall 21 of the gear case 20, and regulate the distance between the bottom wall 21 and the front wall 4.

In assembling the transmission-integrated motor 1 described above, the rear wall 5 and the rear end of the housing 3 are fixed by caulking, and the rear wall 5 is set down, the front end opening is set up, and the housing 3 is placed vertically. I do. First, the resin magnet 7 is inserted into the housing 3 from above, that is, from the front end opening.

Then, the rotor 10 is inserted and the rear end of the rotor shaft 11 is supported by the bearing 18 of the rear wall 5, and the shaft 25 and the shaft end bearing 24 Is attached to the front end of the housing 3 and fixed by caulking. Since all the assembling operations can be performed in the same direction from the front (upper) side, instead of fixing the shaft 25 and the shaft end bearing 24 to the front wall 4 in advance, the shaft 25 and the shaft There is no problem even if the end bearing 24 is attached.

Next, an input gear 19 is attached to the front end of the rotor shaft 11 protruding from the front wall 4, the gears 27 are sequentially incorporated into a plurality of shafts 25, and the rear end of the output shaft 30 is connected to the front wall 4. Shaft end bearing 24
To support. Then, the front end of the output shaft 30 is passed through the main bearing 23 of the gear case 20, and the opening edge of the gear case 20 is put on the end of the motor case 2,
The gear case 20 is fixed to the front wall 4 by bolts 32.
At this time, since the plurality of shafts 25 are press-fitted into the front wall 4, they are easily aligned with the receiving holes 28 in the bottom wall 21 of the gear case 20.

In this embodiment, the members for supporting the rotor shaft 11, supporting the shaft 25 for the gear 27, and fixing the gear case 20 are different from the conventional three members to one member of the front wall 4. And the bolts for mounting the spacer and the base plate are not required, and the structure is extremely simple. Also, in assembling, since the components are sequentially assembled from the front end side of the housing 3 connected to the rear wall 5, the setup is easy.

In particular, unlike the prior art, it is not necessary to assemble the reduction gear mechanism as a separate unit in advance, so it is not necessary to hold stock as a unit, and if there are discrete parts, various sizes and characteristics are required at the production line site. Can be easily handled. Furthermore, since the housing 3 of the motor case has a simple cylindrical shape to which the separate front wall 4 and rear wall 5 are attached, as shown in FIG. It can be manufactured simply by processing and fitting the side edges together (S).

Next, FIG. 3 shows a modification of the connecting portion between the motor case and the gear case. A circumferential ridge 35 is formed on the outer peripheral surface of the front wall 4A near the reduction gear mechanism G side, and each end of the housing 3 and the gear case 20A having substantially the same outer diameter from both sides in the axial direction. The edges come into contact. The height of the ridge 35 is equal to the plate pressure of the cylindrical portion 22A of the housing 3 and the gear case. The portion of the front wall 4 that overlaps with the gear case 20A is a thin portion 36 so as to secure a wide space on the reduction gear mechanism G side. In the caulking portion where the small piece 37 on the housing 3 side is bent and joined, the outer peripheral surface of the front wall 4A is cut out including the ridge 35 and the thin portion 36.

Thus, the end of the gear case 20A is tightened by the bolt (32) so that the edge of the gear case 20A is formed by the ridge 35 of the front wall 4A.
And are joined together to improve the overall rigidity. In this case, the length of the plurality of shafts 25 may be set so as to be received only in the receiving hole (28) in the bottom wall of the gear case 20A and not to protrude in the axial direction.

In this embodiment, the resin magnet 7 in which the circumferential portion and the magnetic pole portion are integrally formed is used. However, as shown in FIG. 4, an arc-shaped magnet 7A is provided with a spring 39 between its circumferential edges. It may be interposed and assembled,
Further, the motor case may be fixed to the inner peripheral surface with an adhesive. However, by sandwiching the integrally molded resin magnet between the front and rear walls, the material cost of the magnet is reduced, and there is no need for adhesives or parts for mounting the magnet, and there is no dropout. Is obtained.

[0029]

As described above, according to the first aspect of the present invention, a bottomed cylindrical gear case forming a closed space is attached to the end wall of the motor case, and the input gear at the end of the rotor shaft is connected to the input gear at the end of the rotor shaft in the closed space. Since the shaft that rotatably supports the transmission gear interposed between the output gears of the output shaft supported by the main bearing provided on the bottom wall of the gear case is attached to the end wall, the end wall of the motor case is In addition, the number of parts can be reduced and the cost can be reduced, also serving as the base member of the transmission gear mechanism and the mounting member of the gear case.

According to the second aspect of the present invention, the motor case includes a housing having a cylindrical portion and an end wall fixed to at least one open end of the housing. It is possible to increase the rigidity of the shaft supporting the transmission gear and the mounting rigidity of the gear case without being restricted by the housing which may be thinner. In addition, since the motor parts can be assembled into the housing, the end walls can be fixed, the shaft and transmission gear can be mounted, and the gear case can be mounted sequentially in the same direction, which facilitates assembly setup and reduces the number of assembly steps. have.

According to the third aspect of the present invention, the tip of the shaft attached to the end wall of the motor case is in contact with the bottom wall of the gear case to regulate the space between the end wall and the bottom wall, and the gear case is provided with the same. Put the open end on the outer periphery of the end of the motor case,
The gear case can be easily mounted simply by screwing a bolt that penetrates the bottom wall into the end wall.

According to a fourth aspect of the present invention, a circumferential ridge is formed on an outer peripheral surface of an end wall of the motor case, and an end of the housing is fixed by contacting one side of the ridge with the gear case. Since the end is brought into contact with the other side surface of the ridge, there is an advantage that the mounting rigidity is improved and the outer diameters of the gear case and the motor case can be made equal.

According to the fifth aspect of the present invention, the shaft end bearing for supporting the other end of the output shaft corresponding to the main bearing is provided on the end wall of the motor case. And the configuration can be easily suppressed.

According to a sixth aspect of the present invention, a resin magnet in which a circumferential portion and a magnetic pole portion projecting inward from the circumferential portion are integrally formed is sandwiched between opposed end walls, and is provided on the inner periphery of the motor case. The installation reduces magnet material costs and eliminates the need for adhesives or parts for mounting magnets.
Moreover, there is no dropout.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of the embodiment.

FIG. 3 is a cross-sectional view showing a modified example of a connection portion between a motor case and a gear case.

FIG. 4 is a diagram showing a modification of the magnet of the motor.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmission integrated motor 2 motor case 3 housing 4, 4A front wall (end wall) 5 rear wall 7 resin magnet 7A magnet 8 circumferential part 9 magnetic pole part 10 rotor 11 rotor shaft 12 core 13 coil 14 commutator 15 brush 17 , 18 bearing 19 input gear 20, 20A gear case 21 bottom wall 22, 22A cylindrical portion 23 main bearing 24 shaft end bearing 25 shaft 26 hole 27, 27a, 27b gear (transmission gear) 28 receiving hole 30 output shaft 31 output gear 32 bolt 33 Screw hole 35 Protrusion 36 Thin part 37 Small piece 39 Spring 40 Motor case 41 Front wall 42 Magnet 43 Spacer 44 Screw hole 45 Gear case 46 Bottom wall 47 Bearing window 48, 58 Bolt 49 Through hole 51 Upper base plate 52 Base plate 53 Shaft 55 Output shaft DOO 57 pipe G reduction gear mechanism (gear mechanism) G1 reduction gear mechanism M, M1 motor R closed space S mating bond

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J009 DA13 EA05 EA11 EA21 EA32 EA44 EC04 EC06 ED09 FA14 5H607 AA11 AA12 BB01 BB04 BB26 CC03 DD09 DD19 EE36

Claims (6)

[Claims] In a transmission-integrated motor having a transmission gear mechanism at an axial end of the motor, a bearing for supporting a rotor shaft so as to penetrate a rotor shaft is attached to an end wall of a motor case. A bottomed cylindrical gear case forming a closed space is attached to the end wall, an input gear is attached to an end of the rotor shaft protruding into the closed space from the end wall, and an output gear is provided in the closed space. One end of the output shaft, which is supported by a main bearing provided on the bottom wall of the gear case and extends outward, can rotate a transmission gear interposed between the input gear and the output gear in the closed space. Wherein the input gear, the transmission gear, and the output gear form the transmission gear mechanism. 2. A transmission integrated motor having a transmission gear mechanism at an axial end of the motor, wherein a motor case has a cylindrical housing and at least one of a housing.
And an end wall fixed to the two open ends, and a bearing for supporting the rotor shaft through the end wall is attached to the end wall, and a bottomed cylindrical gear case forming a closed space with the end wall. Is attached to the end wall, an input gear is attached to an end of the rotor shaft protruding from the end wall into the closed space, and one end of an output shaft including an output gear in the closed space is formed at a bottom of the gear case. A shaft, which is supported by a main bearing provided on a wall and extends outward, rotatably supports a transmission gear interposed between the input gear and the output gear in the closed space, is attached to the end wall. A transmission integrated motor, wherein the input gear, the transmission gear, and the output gear form the transmission gear mechanism. 3. An end of a shaft attached to an end wall of the motor case abuts against a bottom wall of the gear case to regulate a gap between the end wall and the bottom wall. The transmission-integrated motor according to claim 1 or 2, wherein the motor is integrated with the end wall of the case and attached to the end wall by a bolt penetrating the bottom wall. 4. An end wall of the motor case is formed with a circumferential ridge on an outer peripheral surface thereof, and an end of the housing is fixed by abutting an edge of the housing on one side surface of the ridge. 3. The transmission-integrated motor according to claim 2, wherein an open end is in contact with the other side surface of said ridge, and is attached to said end wall by a bolt penetrating said bottom wall. 5. A shaft end bearing for supporting the other end of an output shaft corresponding to the main bearing is provided on an end wall of the motor case.
5. The transmission-integrated motor according to 2, 3, or 4. 6. The motor, wherein a resin magnet in which a circumferential portion and a magnetic pole portion protruding inward from the circumferential portion are integrally formed, the both ends of the circumferential portion are connected to the end wall and the end wall. The transmission-integrated motor according to any one of claims 1, 2, 3, 4, and 5, wherein the transmission-integrated motor is sandwiched between other facing end walls and installed on an inner periphery of the motor case.