Patent Publication Number: US-2023139580-A1

Title: Motor unit for motor incorporating roller, geared motor, and method for manufacturing the same

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a motor unit for a motor incorporating roller that drives a roller body of a motor incorporating roller. The present invention also relates to a method for manufacturing the motor unit for the motor incorporating roller. The present invention further relates to the motor incorporating roller. The present invention further relates to a geared motor and a method for manufacturing the geared motor. 
     Background Art 
     As a component of a roller conveyor device or the like, a motor incorporating roller is known. The motor incorporating roller has a motor and a speed reducer incorporated in the roller body, and rotates the outer roller body by driving an incorporated motor. Some motor incorporating rollers do not have the speed reducer. 
     Some motor incorporating rollers incorporate a drive unit such as a motor into a separately prepared cylinder body. Hereinafter, the motor unit for the motor incorporating roller will be simply referred to as a motor unit. The motor unit is applicable to roller bodies having different lengths, and accordingly has high versatility as a component. Furthermore, the motor incorporating roller can be easily assembled by adopting the motor unit. Patent Document 1 discloses a motor unit with a built-in circuit board. The motor unit has a structure similar to that of the geared motor.
     Patent Document 1: JP 2020-103036 A   

     A brake-equipped conveyor device is well known. In the brake-equipped conveyor device, in most cases, the brake is externally attached to the motor incorporating roller. Although the brake is disposed in the roller body of the motor incorporating roller in some cases, the motor incorporating roller having this structure usually does not use the motor unit. A brake-equipped motor incorporating roller is difficult to assemble since it is difficult to utilize the motor unit. 
     The present invention has been made for solving the above-described problem, and an object thereof is to provide a motor unit for a motor incorporating roller having a brake function. Another object of the present invention is to provide a geared motor having a brake function. 
     SUMMARY OF THE INVENTION 
     As an aspect for solving the above problem is a motor unit configured to be inserted into a separately prepared roller body to constitute a motor incorporating roller, including an outer cylinder, a motor, a brake member, and a circuit board, wherein the outer cylinder incorporates the motor, the brake member, and the circuit board, wherein the brake member is located between the motor and the circuit board in the outer cylinder, and wherein the circuit board is wired to the motor and the brake member in the outer cylinder. 
     In the motor unit of the present aspect, the motor, the brake member, and the circuit board are incorporated in the outer cylinder. In the motor unit of the present aspect, the brake member is also included in the unit in addition to the drive unit such as the motor and the like, and the circuit board. Therefore, it is easy to use for manufacturing a brake-equipped motor incorporating roller, and assembly thereof is simplified. In the motor unit of the present aspect, the brake member is located between the motor and the circuit board. Therefore, it is easy to configure a power transmission mechanism from the motor to the outside. 
     In the above aspect, it is preferable that the motor includes a rotor and a stator that covers periphery of the rotor, the stator being fixed to the outer cylinder, and the motor unit includes an inner cylinder inserted into the outer cylinder, the inner cylinder covering the brake member and the circuit board. 
     In the above aspect, it is preferable that the motor includes a rotor and a stator that covers periphery of the rotor, the stator being fixed to the outer cylinder, and the motor unit includes a pressing member inserted into the outer cylinder, the pressing member covering the brake member and the circuit board. 
     In the case of adopting a configuration in which the motor, the brake member, and the circuit board are provided in the outer cylinder, it is necessary to electrically connect the circuit board to the stator of the motor and the brake member. However, when the motor, the brake member, and the circuit board are incorporated in the outer cylinder, it is difficult in terms of space to connect them. Therefore, they are inserted into the outer cylinder after being connected outside. Here, the roller body of the motor incorporating roller is rotated by the motor in the motor unit. On the other hand, the outer cylinder of the motor unit is fixed to the outside and does not rotate. The motor includes the rotor and the stator. The rotor rotates, but the stator is not allowed to rotate. Therefore, in the motor unit, the stator needs to be non-rotatably attached to the outer cylinder. Therefore, in many cases, the stator of the motor is press-fitted into the outer cylinder. However, it is difficult to press-fit the stator in a state where the motor and the brake member are connected to the circuit board. That is, the stator has rigidity enough to withstand the pressing force of press-fitting, but the brake member and the circuit board do not have such rigidity. Therefore, it is difficult to press-fit the stator by pressing the circuit board. 
     The present aspect solves this problem. The motor unit of the present aspect includes the inner cylinder or the pressing member, and the brake member and the circuit board are covered with the inner cylinder or the pressing member. With the motor unit of the present aspect, the stator can be press-fitted into the roller body by applying the external force to the inner cylinder or the pressing member to press the stator via the inner cylinder. 
     In the above aspect, it is preferable that the inner cylinder is directly or indirectly in contact with a part of the motor, and the motor moves integrally with the inner cylinder when the inner cylinder is pressed in an axial direction. 
     In the above aspect, it is preferable that the pressing member is directly or indirectly in contact with a part of the motor, and the motor moves integrally with the pressing member when the pressing member is pressed in an axial direction. 
     According to the present aspect, it is easy to press-fit the stator into the roller body by pressing the stator via the inner cylinder or the pressing member. 
     In the above aspect, it is desirable that the inner cylinder has an opening or a notch, and at the opening or the notch, the brake member is engaged with the outer cylinder directly or via another member interposed between the brake member and the outer cylinder. 
     In the above aspect, it is desirable that the pressing member has an opening or a notch, and at the opening or the notch, the brake member is engaged with the outer cylinder directly or via another member interposed between the brake member and the outer cylinder. 
     Since the brake member needs to obtain the reaction force against rotation, a fixed and non-rotating portion is required. As described above, since the outer cylinder is fixed to the outside and does not rotate, it is desirable to engage a part of the brake member with the outer cylinder. In the motor unit of the present aspect, the inner cylinder and the pressing member have the opening or the notch, and the brake member and the outer cylinder are engaged with each other directly or with another member interposed therebetween at the opening or the notch. Therefore, the brake member can obtain the reaction force against rotation. 
     In the above aspect, it is desirable that the brake member includes a groove on its side surface, the groove accommodating wiring that connects the motor to the circuit board. 
     According to the present aspect, the wiring is hardly damaged when the device is inserted into the inner cylinder. 
     An aspect of a motor incorporating roller is a motor incorporating roller including the motor unit according to any one of the above wherein the motor unit is inserted into a roller body. 
     The motor incorporating roller of the present aspect has high compatibility of components and is easy to assemble. 
     An aspect is a method for manufacturing a motor unit, wherein the motor unit is configured to be inserted into a separately prepared roller body to constitute a motor incorporating roller, wherein the motor unit includes an outer cylinder, a motor, a brake member, a circuit board, and an inner cylinder, the outer cylinder incorporating the motor, the brake member, and the circuit board, the method including the steps of: wiring the circuit board to the motor and the brake member outside the outer cylinder; inserting the circuit board and the brake member into the inner cylinder, and press-fitting the motor into the outer cylinder by pressing the inner cylinder in a state where a part of the inner cylinder is in contact with a part of the motor. 
     Another aspect is a method for manufacturing a motor unit, wherein the motor unit is configured to be inserted into a separately prepared roller body to constitute a motor incorporating roller, wherein the motor unit includes an outer cylinder, a motor, a brake member, a circuit board, and a pressing member, the outer cylinder incorporating the motor, the brake member, and the circuit board, the method including the steps of: wiring the circuit board to the motor and the brake member outside the outer cylinder; surrounding the circuit board and the brake member with the pressing member, and press-fitting the motor into the outer cylinder by pressing the pressing member in a state where a part of the pressing member is in contact with a part of the motor. 
     Another aspect for solving the above problem is a geared motor including: an outer cylinder, a motor, a speed reducer, a brake member, and a circuit board, wherein the outer cylinder incorporates the motor, the speed reducer, the brake member, and the circuit board, wherein the brake member is located between the motor and the circuit board in the outer cylinder, wherein the circuit board is wired to the motor and the brake member in the outer cylinder, wherein the motor includes a rotor and a stator that covers periphery of the rotor, the stator being fixed to the outer cylinder, wherein the geared motor includes a pressing member inserted into the outer cylinder, the pressing member covering the brake member and the circuit board, wherein the pressing member is directly or indirectly in contact with a part of the motor, and wherein the motor moves integrally with the pressing member when the pressing member is pressed in an axial direction. 
     Another aspect for solving the above problem is a method for manufacturing a geared motor, the geared motor including: an outer cylinder; a motor; a speed reducer; a brake member; and a circuit board, the outer cylinder incorporating the motor, the speed reducer, the brake member, the circuit board, and a pressing member, the method including the steps of: connecting the circuit board to the motor and the brake member outside the outer cylinder; surrounding the circuit board and the brake member with the pressing member, and press-fitting the motor into the outer cylinder by pressing the pressing member in a state where a part of the pressing member is in contact with a part of the motor. 
     A motor unit for a motor incorporating roller of the present invention includes a brake member, and has high compatibility of components in manufacturing a motor incorporating roller having a brake function. 
     A geared motor of the present invention includes a brake member and is widely used. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a front view of a motor incorporating roller according to an embodiment of the present invention. 
         FIG.  2    is a cross-sectional view of the motor incorporating roller in  FIG.  1   . 
         FIG.  3    is an exploded perspective view of the motor incorporating roller in  FIG.  1   . 
         FIG.  4 A  is a cross-sectional view of a motor unit for a motor incorporating roller (geared motor) incorporated in the motor incorporating roller in  FIG.  1   , and  FIG.  4 B  is an enlarged view of the circle in  FIG.  4 A . 
         FIG.  5    is an exploded perspective view of the motor unit for the motor incorporating roller (geared motor) in  FIG.  4   . 
         FIG.  6    is an exploded perspective view of an inner cylindrical portion incorporated in the motor unit for the motor incorporating roller (geared motor) in  FIG.  4   . 
         FIGS.  7 A to  7 F  are explanatory views illustrating a manufacturing process of the motor unit for the motor incorporating roller (geared motor) in  FIG.  4   . 
         FIGS.  8 A and  8 B  are perspective views illustrating a variant embodiment of a pressing member. 
         FIG.  9    is an exploded perspective view of a motor unit for a motor incorporating roller (geared motor) according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, embodiments of the present invention will be described. 
     First, the structure of a motor incorporating roller  1  will be schematically described. As illustrated in  FIGS.  1  and  2   , the motor incorporating roller  1  includes a cylindrical hollow roller body  2  and lid members  5  and  6 , and a power transmission member  7  and a motor unit (motor unit for a motor incorporating roller)  10  are incorporated inside. 
     The roller body  2  is a cylinder opened at both ends. The lid members  5  and  6  are attached so as to close both ends of the roller body  2 . As illustrated in  FIG.  2   , the one lid member  5  (the left side in  FIG.  2   ) is formed by integrating a cylindrical roller body fitting member  11 , a bearing  8 , and a body-side shaft member  15 . In the other lid member  6  (right side in  FIG.  2   ), a roller body fitting member  16  and a bearing  17  are integrated. 
     As illustrated in  FIGS.  4  and  5   , the motor unit  10  (motor unit for the motor incorporating roller) includes a cylindrical outer cylinder  20 , and a motor  12 , a speed reducer  13 , and an inner cylindrical portion  25  are incorporated in the outer cylinder  20 . In the inner cylindrical portion  25 , a brake member  27  and a circuit board  18  are incorporated in an inner cylinder (pressing member)  26 . 
     The motor  12  includes a rotor  53  and a stator  51 . The rotor  53  is located at the center, and the stator  51  covers the periphery thereof. The motor  12  is a Hall sensorless motor. The Hall sensorless motor is also referred to as a DC Hall less motor or a brushless Hall less motor, and is a motor that performs rotor position detection without using a Hall sensor. In the Hall sensorless motor, a rotation of the rotor is controlled without detecting a rotational position (angle) of the rotor. The speed reducer  13  has a planetary gear train. An output shaft of the speed reducer  13  is a drive-side shaft  31 . 
     The brake member  27  is an electromagnetic brake. The brake member  27  includes a main body  42  and a brake holder  40 . The main body  42  accommodates a brake disc (not illustrated) attached to a rotation shaft  28  of the motor  12 , a brake pad  35 , a brake electromagnet  36 , and a pressing spring  37 . The brake pad  35  is always pressed against the brake disc by the pressing spring  37 . The brake electromagnet  36  is in the vicinity of the brake pad  35 , attracts the brake pad  35  by energization, and separates the brake pad  35  from the brake disc. As described above, the brake member  27  always unrotatably fixes the rotation shaft  28  of the motor, and opens the rotation shaft  28  by energizing the brake electromagnet  36 . The brake holder  40  is a member that covers the outside of the main body  42 , and is integrally fixed to the main body  42  in the rotation direction. 
     The circuit board  18  is for controlling the operations of the motor  12  and the brake member  27 , and includes an input circuit, a microcomputer unit, a motor drive circuit, and a brake control circuit (all not illustrated). In addition, a communication function for communicating with the outside is provided. 
     The outer cylinder  20  is provided with a fixed-side shaft  30  protruding outward from one axial end and the drive-side shaft  31  protruding outward from the other axial end. The fixed-side shaft  30  is integrally attached to the outer cylinder  20  and does not rotate relative to each other. 
     The fixed-side shaft  30  is a shaft that is inserted into the bearing  17  of the other lid member  6  in a state where the motor unit  10  is disposed in the roller body  2 , and is a portion that functions as one body-side shaft member of the roller body  2 . The fixed-side shaft  30  is hollow and has a signal line and a power line inserted therein. These lines are connected to the circuit board  18 . The drive-side shaft  31  (output shaft of the speed reducer  13 ) is a shaft connected to the power transmission member  7  in a state where the motor unit  10  is disposed in the roller body  2 , and is a rotation shaft that outputs the power of the motor  12  to the roller body  2 . The drive-side shaft  31  is rotatably supported by the outer cylinder  20  via a bearing  41 . 
     The motor  12 , the speed reducer  13 , the brake member  27 , and the circuit board  18  are incorporated in the roller body  2  of the motor incorporating roller  1 . In the motor incorporating roller  1 , the body-side shaft member  15  protrudes from one end. The fixed-side shaft  30  of the motor unit  10  protrudes from the other end of the motor incorporating roller  1 . The motor incorporating roller  1  is supported by the body-side shaft member  15  and the fixed-side shaft  30  of the motor unit  10  that are protruding from both ends and are fixed to a conveyor frame (not illustrated). The roller body  2  is provided with the bearing  8  between the roller body  2  and the body-side shaft member  15 , and the bearing  17  between the roller body  2  and the fixed-side shaft  30  of the motor unit  10 , so that the roller body  2  can rotate relative to the conveyor frame (not illustrated). On the other hand, since the fixed-side shaft  30  is fixed to the conveyor frame and the fixed-side shaft  30  is integrally attached to the outer cylinder  20 , the motor unit  10  is not rotatable relative to the conveyor frame. 
     The motor incorporating roller  1  is supplied with power from the outside via a wiring inserted through the fixed-side shaft  30 . The motor  12  is supplied with power from the circuit board  18 . When the motor  12  rotates in the motor unit  10 , the rotational force is decelerated by the speed reducer  13  and output from the drive-side shaft  31 . The drive-side shaft  31  is engaged with the power transmission member  7 , and the rotational force is transmitted to the roller body  2  via the power transmission member  7 . The roller body  2  is forcibly stopped by driving the brake member  27 . 
     Next, a characteristic configuration of the motor incorporating roller  1  will be described. 
     In the motor incorporating roller  1  of the present embodiment, not only the motor  12  and the speed reducer  13  but also the brake member  27  and the circuit board  18  are incorporated in the roller body  2 . The motor  12  adopted in the present embodiment includes the rotor  53  at the center, and the stator  51  surrounds the rotor  53 . In the motor  12  adopted in the present embodiment, rotation shafts  23  and  28  protrude from both ends, one rotation shaft  23  is connected to the speed reducer  13 , and the other rotation shaft  28  is connected to the brake member  27 . 
     Therefore, in the layout of the outer cylinder  20  of the motor unit  10 , the speed reducer  13 , the brake member  27 , and the circuit board  18  are arranged in this order from the drive-side shaft  31  side. In the present embodiment, the speed reducer  13  can be disposed in front of the motor  12 , the configuration can have the brake function, a power transmission path can be linearly disposed, by placing the brake member  27  between the motor  12  and the circuit board  18 . 
     Next, a characteristic configuration of the motor unit  10  will be described. 
     As described above, the motor unit  10  of the present embodiment includes the cylindrical outer cylinder  20 , and the motor  12 , the speed reducer  13 , and the inner cylindrical portion  25  are incorporated in the outer cylinder  20 . In the inner cylindrical portion  25 , the brake member  27  and the circuit board  18  are incorporated in the inner cylinder (pressing member)  26 . That is, the motor unit  10  has a double structure in which the inner cylinder  26  is disposed in the outer cylinder  20 . An internal gear  50  constituting an outline of the planetary gear train of the speed reducer  13  and the stator  51  of the motor  12  are integrally fixed to an inner surface of the outer cylinder  20 . 
     The brake member  27  and the circuit board  18  are provided in the inner cylinder  26  (pressing member). In the present embodiment, the brake member  27  and the circuit board  18  are entirely inserted into the inner cylinder  26 , and the brake member  27  and the circuit board  18  are entirely surrounded and covered by the inner cylinder (pressing member)  26 . The inner cylinder  26  is a cylinder with both ends open. As illustrated in  FIGS.  4  and  5   , three notches  52  are provided at one end of the inner cylinder  26 . Each of the notches  52  extends in the axial direction with the end of the inner cylinder  26  as an open end. The notch  52  reaches a region in which the brake member  27  is incorporated. 
     As illustrated in  FIG.  6   , the brake member  27  is provided with a groove  55  extending in the axial direction in an outer portion. The groove  55  extends linearly over both the brake holder  40  and the main body  42 . The circuit board  18  is held by a board holder  56 . The board holder  56  includes two holder pieces  60  and  61 . Both of the two holder pieces  60  and  61  have semicircular inner cylinder inscribed portions  63  and  65  and planar board holding portions  66  and  67 . The circuit board  18  is a quadrangular plate, and is sandwiched between the board holding portions  66  and  67  of the two holder pieces  60  and  61 . 
     The inner cylinder  26  is disposed in the outer cylinder  20  with the brake member  27  and the circuit board  18  inserted therein. In the present embodiment, as illustrated in  FIG.  4   , the outer cylinder  20  has a portion corresponding to the notch  52  of the inner cylinder  26  swaged, and a recess portion  68  of the outer cylinder  20  is engaged with the brake holder  40  of the brake member  27 . Therefore, the brake member  27  is integrally fixed to the outer cylinder  20 . 
     In the outer cylinder  20 , the motor  12  and the circuit board  18  are connected by wiring  57 . As illustrated in  FIG.  6   , the wiring  57  connecting the motor  12  and the circuit board  18  is accommodated in the groove  55  of the brake member  27 . In the outer cylinder  20 , the brake member  27  and the circuit board  18  are also connected by wiring  58 . 
     Next, a method for manufacturing the motor unit  10  will be described. 
     As illustrated in  FIG.  7 A , in the motor unit  10 , the bearing  41  and the speed reducer  13  are mounted in the outer cylinder  20  first. On the other hand, as illustrated in  FIG.  7 A , the wiring  57  connects between the motor  12  and the circuit board  18  outside the outer cylinder  20 . Furthermore, the wiring  58  connects a signal line and a power line between the brake member  27  and the circuit board  18 . Here, in the present embodiment, since the brake member  27  is provided between the motor  12  and the circuit board  18 , the wiring  57  between the motor  12  and the circuit board  18  needs to straddle the brake member  27 . In the present embodiment, the groove  55  extending in the axial direction is provided in the brake holder  40  of the brake member  27 , and the wiring  57  between the motor  12  and the circuit board  18  is accommodated in the groove  55  of the brake member  27 . 
     Subsequently, as illustrated in  FIG.  7 B , the brake member  27  and the circuit board  18  are inserted into the inner cylinder  26 . The brake member  27  is disposed in the notch  52  portion of the inner cylinder  26 . The motor  12  is outside the inner cylinder  26 . Then, as illustrated in  FIG.  7 C , the motor  12  is pressed against the end portion of the outer cylinder  20 . Subsequently, the pressing device  100  pushes the inner cylinder  26  toward the outer cylinder  20 . As a result, as illustrated in  FIG.  7 D , the motor  12  receives the pressing force via the inner cylinder  26  and is press-fitted into the outer cylinder  20 . Specifically, the end of the inner cylinder  26  comes into contact with the stator  51  of the motor  12 , and the motor  12  is press-fitted into the outer cylinder  20  by pushing the inner cylinder  26  toward the outer cylinder  20 . Note that something may be interposed between the inner cylinder  26  and the motor  12 . 
     That is, the inner cylinder  26  is in direct or indirect contact with a pail of the motor  12 , and by pressing the inner cylinder  26  in the axial direction, the motor  12  moves integrally with the inner cylinder  26  and is press-fitted into the outer cylinder  20 . Note that something may be interposed between the inner cylinder  26  and the motor  12 . The inner cylinder  26  is further pushed by the pressing device  100 , and the brake member  27  and the circuit board  18  are inserted into the outer cylinder  20  together with the inner cylinder  26  (press-fitting step). As a result, as illustrated in  FIG.  7 D , the rotation shaft  23  of the motor  12  is engaged with the speed reducer  13  in the outer cylinder  20 . The brake member  27  is accommodated in a predetermined position in the outer cylinder  20 . Furthermore, the stator  51  of the motor  12  is press-fitted and integrally fixed to the outer cylinder  20 . 
     Subsequently, as illustrated in  FIG.  7 E , a portion corresponding to the notch  52  portion of the inner cylinder  26  is struck from the outside of the outer cylinder  20  to be recessed and swaged. As a result, as illustrated in  FIG.  4 B , the recess portion  68  of the outer cylinder  20  reaches the brake member  27  beyond the notch  52  of the inner cylinder  26 , and engages with a part of the brake member  27 . As a result, the brake member  27  is integrally coupled to the outer cylinder  20 . In the present embodiment, three notches  52  are provided in the inner cylinder  26 , and the recess portions  68  are provided at positions corresponding to the respective notches  52 . However, the number of the notches  52  and the number of the recess portions  68  are arbitrary, and the numbers thereof may be different. 
     Here, as described above, since the fixed-side shaft  30  is fixed to the conveyor frame and the fixed-side shaft  30  is integrally attached to the outer cylinder  20 , the motor unit  10  is not rotatable relative to the conveyor frame. Therefore, the outer cylinder  20  is not rotatable relative to the conveyor frame. 
     The brake member  27  needs to have a portion that is fixed and does not rotate in order to obtain the reaction force against rotation. In the present embodiment, since the brake member  27  is integrally coupled to the outer cylinder  20  that does not rotate, the reaction force against rotation can be obtained. 
     In the embodiment described above, the notches  52  are provided in the inner cylinder  26 , but openings may be provided instead of the notches. 
     In the embodiment described above, the Hall sensorless motor is used, but the structure of the motor  12  is not limited, and may be a brushless motor having a Hall sensor, or may be a brush motor. An AC motor may be used. 
     When the motor incorporating roller  1  is manufactured, a cylinder to be the roller body  2  is separately prepared, and the power transmission member  7  is fixed in the cylinder. Furthermore, the motor unit  10  is inserted into the roller body  2 , and the drive-side shaft  31  of the motor unit  10  is engaged with the power transmission member  7 . 
     In the embodiment described above, in the inner cylinder  26 , the brake member  27  and the circuit board  18  are entirely inserted into the inner cylinder  26 , and the brake member  27  and the circuit board  18  are entirely covered with the inner cylinder  26 . However, a part of the brake member  27  and the circuit board  18  may be covered with the inner cylinder  26 , and a part thereof may be exposed to the outside. 
     A part of the motor  12  may be covered with the inner cylinder  26 . 
     In the embodiment described above, the outer cylinder  20  is swaged to directly engage the recess of the outer cylinder  20  with a part of the brake member  27 . However, another member such as a pin or a rivet may pass through the outer cylinder  20  to couple the brake member  27  and the outer cylinder  20 . 
     In the embodiment described above, the brake member  27  and the circuit board  18  are inserted into the inner cylinder  26 , and the motor  12  is press-fitted into the outer cylinder  20  by pushing the inner cylinder  26  toward the outer cylinder  20  in a state where the motor  12  is pushed against the end of the outer cylinder  20 . In the above-described embodiment, the inner cylinder  26  is used as the pressing member. The pressing member (inner cylinder  26 ) of the above-described embodiment has a tubular shape, and surrounds the brake member  27  and the circuit board  18  to surround and cover the periphery substantially completely, but the shape of the pressing member is not limited to the tubular shape. 
     For example, the pressing member may be configured by pressing member pieces  71   a  and  71   b  having a half shape like a pressing member  70  illustrated in  FIG.  8 A . As illustrated in  FIG.  9   , the pressing member  70  surrounds and covers the periphery of the brake member  27  and the circuit board  18 . In the present embodiment, a gap between the pressing member pieces  71   a  and  71   b  is an opening  72 , a portion corresponding to the opening  72  of the outer cylinder  20  is swaged, and the recess portion  68  of the outer cylinder  20  is engaged with the brake holder  40  of the brake member  27 . 
     Furthermore, a pin-shaped pressing member  73  as illustrated in  FIG.  8 B  can also be adopted. In the pressing member  73 , a plurality of pins  75  protrude from one of an annular link  76 . The pressing member  73  surrounds the periphery of the brake member  27  and the circuit board  18 . In the present embodiment, a gap between the pins  75  is an opening  77 , a portion corresponding to the opening  77  of the outer cylinder  20  is swaged, and the recess portion  68  of the outer cylinder  20  is engaged with the brake holder  40  of the brake member  27 . In the press-fitting step described above, the tips of the pins  75  are brought into contact with a part of the motor  12  and the pressing member  73  is pressed in the axial direction, so that the motor  12  moves integrally with the inner cylinder  26  and is press-fitted into the outer cylinder  20 . 
     The motor unit  10  described above has been developed as a constituent member of the motor incorporating roller  1 , but can also be used as a geared motor  80 . As illustrated in  FIG.  4   , the geared motor  80  includes the outer cylinder  20 , and the motor  12 , the speed reducer  13 , and the inner cylindrical portion  25  are incorporated in the outer cylinder  20 . The inner cylindrical portion  25  includes the inner cylinder (pressing member)  26 , and the brake member  27  and the circuit board  18  are incorporated in the inner cylinder  26 . In the outer cylinder  20 , the brake member  27  is located between the motor  12  and the circuit board  18 , and in the outer cylinder  20 , the circuit board  18  is connected to the motor  12  and the brake member  27 . The motor  12  includes the rotor  53  and the stator  51  that covers the periphery of the rotor, and the stator  51  is fixed to the outer cylinder  20 . The inner cylinder (pressing member)  26  is inserted into the outer cylinder  20 , and the brake member  27  and the circuit board  18  are covered with the inner cylinder  26 . The inner cylinder (pressing member)  26  is in direct or indirect contact with a part of the motor  12 , and when the inner cylinder (pressing member)  26  is pressed in the axial direction, the motor  12  moves integrally with the inner cylinder (pressing member)  26 . 
     EXPLANATION OF REFERENCE NUMBERS 
     
         
         
           
               1 : Motor incorporating roller 
               2 : Roller body 
               10 : Motor unit (motor unit for the motor incorporating roller) 
               12 : Motor 
               13 : Speed reducer 
               18 : Circuit board 
               20 : Outer cylinder 
               25 : Inner cylindrical portion 
               26 : Inner cylinder (pressing member) 
               27 : Brake member 
               40 : Outer portion 
               51 : Stator 
               52 : Notch 
               53 : Rotor 
               55 : Groove 
               57 : Wiring 
               68 : Recess portion 
               70 ,  73 : Pressing member 
               72 ,  77 : Opening 
               80 : Geared motor 
               100 : Pressing device