JP2017204927A - Geared motor and pointer type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geared motor capable of suppressing assembly in a state where a gear cannot rotate, even if a stopper mechanism is provided between the gear and a support member, and to provide a pointer type display device.SOLUTION: In a geared motor 100, a driven-side gear 42 includes a gear side convex part 48 for stopper projecting from a tabular part 43 toward a second case member 22, and the second case member 22 includes a support side convex part for stopper projecting toward the tabular part 43 and against which the gear side convex part 48 abuts from the circumferential direction. The driven-side gear 42 is provided with an interfered part 49 which abuts against an interference part, provided in the second case member 22, in the rotation center axis line L direction when the first and second case members 21, 22 are superposed in a state where the gear side convex part 48 and support side convex part are superposed in the rotation center axis line L direction and disables the coupling of a hook 219 and an engaging convex part 229.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a geared motor and a pointer-type display device in which a gear train is provided with a stopper mechanism.

  In a pointer-type display device or the like, a geared motor including a motor and a gear train is used inside a case, and a pointer is fixed to an output member of the geared motor (Patent Document 1). With respect to such a geared motor, Patent Document 1 proposes to provide a stopper mechanism for stopping the gear at a predetermined position. More specifically, a gear-side convex portion for a stopper that protrudes toward the support member is provided on a plate-like portion having teeth formed on the outer peripheral surface thereof, and the end plate portion of the support member has a plate-like shape. The structure which provided the support body side convex part for stoppers which the gear side convex part contact | abuts from the circumferential direction when it protrudes toward a part and a gear rotates is proposed. Here, the support member has a lower case and an upper case that supports the gear train between the lower case, and a support-side convex portion is formed on an end plate portion of the lower case.

JP 2001-327149 A

  In the assembly process of the geared motor described in Patent Document 1, when the lower case and the upper case are overlapped in a state where the gear-side convex portion of the gear and the support-side convex portion of the lower case overlap in the rotation center axis direction, There is a gap between the case and the upper case. Even in this case, if the upper case is pressed, the lower case and the upper case can be coupled, but the gear side convex portion and the support side convex portion are in contact with each other in the rotation center axis direction, and the gear cannot be rotated. There is a problem. In addition, when the upper case is pressed, the plate-like portion of the gear, the end plate portion of the support member, the gear-side convex portion, or the support-side convex portion may be deformed. In this case, reassembly cannot be performed.

  In view of the above problems, the problem of the present invention is that a geared motor that can prevent the gear from being assembled in a non-rotatable state even when a stopper mechanism is provided between the gear and the support member, and The object is to provide a pointer-type display device.

  In order to solve the above problems, a geared motor according to the present invention includes a motor unit, an output member, a gear train that transmits rotation of the motor unit to the output member, and a support that supports the gear train, And the support includes a first support member having a coupling portion and a coupled portion coupled to the coupling portion in a state where the gear train is supported between the first support member and the first support member. Any one of the gears included in the gear train includes a plate-like portion having teeth formed on an outer peripheral surface, and a stopper protruding from the plate-like portion toward the second support member. And the second support member protrudes toward the plate-like portion, and the gear-side convex portion abuts from the circumferential direction when the gear rotates. A convex portion, and the gear side convex portion and the support side convex portion are provided on the gear. When the first support member and the second support member overlap with each other in the rotation center axis direction, the interference portion provided on the second support member abuts on the rotation center axis direction and the coupling portion A part to be interfered is configured to make the coupling with the part to be coupled impossible.

  When assembling the geared motor according to the present invention, the first support member and the second support member are overlapped so that the gear-side convex portion for the stopper and the support-side convex portion for the stopper overlap in the rotation center axis direction of the gear. In this case, the interference portion provided on the second support member comes into contact with the interfered portion provided on the gear, and the coupling portion of the first support member and the coupled portion of the second support member cannot be sufficiently approached. For this reason, it becomes difficult to couple | bond a 1st support member and a 2nd support member using a coupling | bond part and a to-be-joined part. Therefore, even when a stopper mechanism is provided between the gear and the support member, it is possible to prevent the geared motor from being assembled in a state where the gear-side convex portion and the support-side convex portion are in contact with each other in the rotation center axis direction.

  In another aspect of the present invention, a motor unit, an output member, a gear train that transmits rotation of the motor unit to the output member, and a support member that supports the gear train, the support member includes: A first support member having a coupling portion, and a second support member having a coupled portion coupled to the coupling portion in a state in which the gear train is supported between the first support member, Any of the gears included in the gear train includes: a plate-like portion having teeth formed on an outer peripheral surface; and a gear-side convex portion for a stopper protruding from the plate-like portion toward the second support member. The second support member includes a support-side convex portion for a stopper that protrudes toward the plate-like portion and contacts the gear-side convex portion from the circumferential direction when the gear rotates. The gear side convex portion and the support side convex portion overlap each other in the rotation center axis direction of the gear. When the first support member and the second support member are overlapped with each other, an interfered portion provided on the second support member and an interfered portion for rotating the gear by abutting in the rotation center axis direction are configured. It is characterized by that.

  When assembling the geared motor according to another aspect of the present invention, the first supporting member and the second supporting member are in a state in which the gear-side convex portion for the stopper and the support-side convex portion for the stopper are in contact with each other in the rotation center axis direction of the gear. When the members are stacked, the interference portion provided on the second support member comes into contact with the interfered portion provided on the gear, and the gear rotates. For this reason, it is possible to eliminate the state in which the gear-side convex portion and the support-side convex portion are in contact with each other in the rotation center axis direction. Therefore, even when a stopper mechanism is provided between the gear and the support member, it is possible to prevent the geared motor from being assembled in a state where the gear-side convex portion and the support-side convex portion are in contact with each other in the rotation center axis direction.

  In the present invention, the interfered portion is provided in the same angular direction centered on the rotation center axis with respect to the gear side convex portion, and the interference portion is the rotation center with respect to the support side convex portion. The aspect provided in the same angular direction centering on an axis line is employable. According to this aspect, there occurs a situation in which the interference portion and the interfered portion contact in the circumferential direction at an angular position different from the angular position where the gear-side convex portion and the support-side convex portion abut to prevent rotation of the gear. Hard to do.

  In the present invention, the interfered portion is provided at a position overlapping with the gear side convex portion in the rotation center axis direction, and the interference portion overlaps with the support side convex portion in the rotation center axis direction. The aspect provided in the position can be adopted.

  In the present invention, the interfered part is an end part on the second support member side of the gear side convex part, and the interference part is an end part on the plate-like part side of the support side convex part. Can be adopted. According to this aspect, since the gear-side convex portion and the support-side convex portion are configured to extend in the rotation center axis direction, the gear-side convex portion is in contact with the support-side convex portion from the circumferential direction and the stopper is operated. Deformation and damage of the gear side convex portion and the support side convex portion can be suppressed.

In the present invention, the gear includes a body portion that protrudes from the center of the plate-shaped portion toward the second support member, and the gear-side convex portion is integrated with the body portion on an outer peripheral surface of the body portion. The provided mode can be adopted. According to this aspect, the strength of the gear-side convex portion can be increased. In addition, the gear-side convex portion and the support-side convex portion abut at a position close to the rotation center axis. For this reason, when the stopper mechanism is actuated, the collision energy received by the gear is small, so that the gear bounce can be suppressed.

  In the present invention, it is possible to adopt a mode in which the gear-side convex portion is provided over the entire rotation center axis direction of the outer peripheral surface of the body portion.

  In the present invention, the second support member includes a cylindrical portion surrounding the body portion, and the support-side convex portion is provided integrally with the cylindrical portion on the inner peripheral surface of the cylindrical portion. Can be adopted. According to this aspect, the strength of the support-side convex portion can be increased.

  In this invention, the said support body side convex part can employ | adopt the aspect provided over the whole said rotation center axis line direction of the internal peripheral surface of the said cylinder part.

  The geared motor according to the present invention can be used, for example, in a pointer type display device, and in this case, the pointer type display device has a pointer held by the output member. In this case, the stop position by the stopper mechanism can adopt a configuration corresponding to the origin position of the pointer.

  When assembling the geared motor according to the present invention, the first support member and the second support member are overlapped so that the gear-side convex portion for the stopper and the support-side convex portion for the stopper overlap in the rotation center axis direction of the gear. In this case, the interference portion provided on the second support member comes into contact with the interfered portion provided on the gear, and the coupling portion of the first support member and the coupled portion of the second support member cannot be sufficiently approached. For this reason, it becomes difficult to couple | bond a 1st support member and a 2nd support member using a coupling | bond part and a to-be-joined part. Therefore, even when a stopper mechanism is provided between the gear and the support member, it is possible to prevent the geared motor from being assembled in a state where the gear-side convex portion and the support-side convex portion are in contact with each other in the rotation center axis direction.

  When assembling the geared motor according to another aspect of the present invention, the first supporting member and the second supporting member are in a state in which the gear-side convex portion for the stopper and the support-side convex portion for the stopper are in contact with each other in the rotation center axis direction of the gear. When the members are stacked, the interference portion provided on the second support member comes into contact with the interfered portion provided on the gear, and the gear rotates. For this reason, it is possible to eliminate the state in which the gear-side convex portion and the support-side convex portion are in contact with each other in the rotation center axis direction. Therefore, even when a stopper mechanism is provided between the gear and the support member, it is possible to prevent the geared motor from being assembled in a state where the gear-side convex portion and the support-side convex portion are in contact with each other in the rotation center axis direction.

It is explanatory drawing of the geared motor to which this invention is applied. It is sectional drawing when the geared motor to which this invention is applied is cut | disconnected in the position which passes along a gear train. It is the disassembled perspective view which looked at the geared motor to which this invention is applied from the output side. It is the disassembled perspective view which looked at the geared motor to which this invention is applied from the non-output side. It is explanatory drawing of the driven side gear used for the geared motor to which this invention is applied. It is explanatory drawing which shows the planar structure of the stopper mechanism comprised in the geared motor to which this invention is applied. It is explanatory drawing of the driven side gear used for the geared motor which concerns on the modification 1 of this invention. It is explanatory drawing of the driven side gear used for the geared motor which concerns on the modification 2 of this invention.

A geared motor and a pointer type display device to which the present invention is applied will be described below with reference to the drawings. In the following description, of the directions in which the rotation center axis L of the output member 10 extends, one side from which the output member 10 projects is referred to as the output side L1, and the side from which the output member 10 projects is defined as The opposite side (the other side) is set as the non-output side L2. Further, the axis of the rotor 5 in the motor unit 1 is a rotation center axis L0, and the axis of the drive side gear 41 of the gear train 4 is a rotation center axis L5. For the sake of convenience, one side of the rotation center axes L0 and L5 is also described as the output side L1, and the other side of the rotation center axes L0 and L5 is also described as the counter-output side L2.

(Overall configuration of pointer-type display device)
FIG. 1 is an explanatory view of a geared motor 100 to which the present invention is applied. FIGS. 1A and 1B are perspective views of the geared motor 100 as viewed from the output side L1, and FIG. It is the perspective view seen from. FIG. 2 is a cross-sectional view of the geared motor 100 to which the present invention is applied, cut at a position passing through the gear train 4. 3 is an exploded perspective view of the geared motor 100 to which the present invention is applied as viewed from the output side L1. FIGS. 3A and 3B show the second case member 22 separated from the first case member 21. FIG. 2 is an exploded perspective view of the state, and an exploded perspective view of a state where the gear train 4 and the like are removed from the first case member 21. FIG. 4 is an exploded perspective view of the geared motor 100 to which the present invention is applied as viewed from the non-output side L2. FIGS. 4 (a) and 4 (b) show that the first case member 21 is separated from the second case member 22. FIG. FIG. 6 is an exploded perspective view of a state in which the gear train 4 and the gear train 4 are removed from a second case member 22.

  The geared motor 100 shown in FIGS. 1 to 4 has a structure in which a shaft-like output member 10 protrudes from the case 2 on the output side L1 in the rotation center axis L direction. The geared motor 100 of this embodiment is used in a pointer type display device 200, and a pointer 11 is connected to the output member 10 as shown in FIG.

  The case 2 includes a first case member 21 that is substantially circular when viewed from the direction of the rotation center axis L, and a second case member 22 that is substantially circular when viewed from the direction of the rotation center axis L. The member 22 overlaps the first case member 21 from the output side L1. The case 2 is a support body that supports the motor unit 1, the gear train 4, and the output member 10 described below, the first case member 21 is a first support member, and the second case member 22 is a first support member. This is a second support member that supports the motor unit 1, the gear train 4, and the output member 10 between the case member 21 (first support member).

  The first case member 21 has an end plate portion 210 and a cylindrical side plate portion 211 protruding from the outer edge of the end plate portion 210 to the output side L1. Hooks 219 (joints) are formed at a plurality of locations. The second case member 22 includes an end plate portion 220 and a cylindrical side plate portion 221 that protrudes from the outer edge of the end plate portion 220 to the non-output side L2, and is provided at a plurality of locations in the circumferential direction of the side plate portion 221. An engagement convex portion 229 (a coupled portion) is formed. Accordingly, the case 2 can be configured by engaging the hook 219 and the engaging convex portion 229 to join the first case member 21 and the second case member 22 together. In the 1st case member 21, the convex part 212 used for fixation of the geared motor 100 etc. protrudes toward the non-output side L2 from the end plate part 210. FIG. Further, in the second case member 22, a convex portion 222 used for fixing the geared motor 100 and the like protrudes from the end plate portion 220 toward the output side L <b> 1.

(Configuration of motor unit 1)
The geared motor 100 includes a motor unit 1 inside the case 2, and the motor unit 1 is a drive source for the output member 10. The motor unit 1 is a stepping motor having a rotor 5 and a stator 6 disposed around the rotor 5. The rotor 5 is rotatably supported on the support shaft 51. The opposite end L2 of the support shaft 51 is held in a shaft hole 213a formed in the end plate portion 210 of the first case member 21, and the end of the support shaft 51 on the output side L1 is the second case member. 22 is held in the shaft hole 223a formed in the end plate portion 220.

  The rotor 5 has a pinion 58 provided at the end on the counter-output side L2 in the direction of the rotation center axis L0, and a cylindrical magnet 50. On the outer peripheral surface of the magnet 50, the S pole and the N pole Are alternately formed at equiangular intervals. In this embodiment, the magnet 50 and the resin pinion 58 are integrated by insert molding. The stator 6 has a stator core 60 provided with a plurality of salient poles facing the outer peripheral surface of the magnet 50 with a gap, and among the salient poles, two salient poles (main poles) have coil bobbins 7. The coil 8 is wound through the wire. The stator core 60 has a plate shape, and is configured by stacking a plurality of magnetic plates punched into a predetermined shape. The stator core 60 is formed with a hole 68 through which a support shaft 410 of the drive side gear 41 described later passes. The coil bobbin 7 holds a plurality of terminal pins 70 to which the end portions of the coils 8 are entangled and connected. The end portions of the terminal pins 70 are formed on the end plate portion 220 of the second case member 22. It protrudes to the output side L1 through the hole 223d.

  The geared motor 100 has a gear train 4 that decelerates the rotation of the rotor 5 and transmits it to the output member 10. In this embodiment, the gear train 4 includes a pinion 58, a drive side gear 41 that meshes with the pinion 58, and a driven side gear 42 that meshes with the drive side gear 41. The drive-side gear 41 includes a large-diameter gear 411 that meshes with the pinion 58 of the rotor 5, and a small-diameter gear 412 that is formed coaxially with the large-diameter gear 411. The driving gear 41 is rotatably supported on the support shaft 410. The opposite end L2 of the support shaft 410 is held in a shaft hole 213b formed in the end plate portion 210 of the first case member 21, and the end of the output L1 of the support shaft 410 is the second case member. 22 is held in a shaft hole 223b formed in a cylindrical portion 226 formed in the end plate portion 220. The driven gear 42 has a disk-shaped plate-like portion 43 in which external teeth 431 that mesh with the small-diameter gear 412 are formed on the outer peripheral surface.

(Configuration of driven gear 42)
FIG. 5 is an explanatory diagram of the driven gear 42 used in the geared motor 100 to which the present invention is applied. FIGS. 5A, 5B, and 5C are views of the driven gear 42 in the oblique direction of the output side L1. FIG. 4 is a perspective view as seen from the direction, a plan view of the driven gear 42 as seen from an oblique direction on the counter-output side L2, and a side view of the driven gear 42.

  The driven gear 42 is a final gear that transmits rotation to the output member 10 and rotates integrally with the output member 10, and has a configuration described below. Therefore, the rotation center axis L of the output member 10 is also the rotation center axis of the driven gear 42.

  In FIG. 5, the driven gear 42 includes a shaft-shaped body portion 44 that protrudes from the center of the plate-like portion 43 to the output side L1, and a circular convex portion 45 that protrudes from the center of the plate-like portion 43 to the counter-output side L2. have. The body portion 44 and the circular convex portion 45 are formed with a shaft hole 440 that is a through hole into which the output member 10 is fitted, and the driven gear 42 and the output member 10 rotate integrally.

  The plate-like portion 43 is formed with a groove 47 penetrating the plate-like portion 43 in the direction of the rotation center axis L. The groove 47 extends to one side around the rotation center axis L, then bends in a U shape and extends to the other side in the circumferential direction. As a result, a portion surrounded by the groove 47 in the plate-like portion 43 is a plate-like spring 46 whose one end in the circumferential direction is connected to the plate-like portion 43. A convex portion 461 that protrudes toward the output side L1 is formed on the tip side of the plate spring 46. In this embodiment, the plate springs 46 are formed to extend in the same direction at two equiangular intervals in the circumferential direction, and the angular pitch of the two plate springs 46 is 180 °.

  The plate-like portion 43 is formed with a gear-side convex portion 48 projecting to the output side L1 and radially outward at an angular position sandwiched in the circumferential direction by two plate-like springs 46. The gear-side convex portion 48 is The stopper mechanism 9 is configured to limit the movable range when the driven gear 42 rotates counterclockwise CCW (one side in the circumferential direction) by abutting on a support-side convex portion 28 described later.

(Support structure for the driven gear 42 and the output member 10)
As shown in FIGS. 3 and 4, the end plate portion 210 of the first case member 21 is formed with a cylindrical portion 215 protruding to the output side L1 and a cylindrical portion 216 protruding to the counter-output side L2. The cylindrical portions 215 and 216 are formed with shaft holes 215a and 216a that rotatably support the non-output side end of the output member 10, respectively.

  On the other hand, the end plate portion 220 of the second case member 22 is formed with a cylindrical portion 225 protruding to the output side L1, and the cylindrical portion 225 supports the output side portion of the output member 10 so as to be rotatable. A shaft hole 225a is formed.

  Further, in the end plate portion 220 of the second case member 22, a cylindrical portion 227 (cylindrical portion) surrounding the body portion 44 of the driven side gear 42 and a radial direction from the cylindrical portion 227 are provided on the surface on the non-output side L 2. Plate-shaped ribs 224 extending outward are formed. The inner diameter of the cylindrical portion 227 is larger than the outer diameter of the trunk portion 44 of the driven gear 42, and the inner surface of the cylindrical portion 227 is not in contact with the trunk portion 44 of the driven gear 42. The ribs 224 are formed at four positions at equal angular intervals around the cylindrical portion 227. Of the four ribs 224, the three ribs 224a, 224b, and 224c are connected to the side plate portion 221, and the remaining one rib 224d is formed with an axial hole 223a and connected to the cylindrical portion 226.

  Here, in the driven gear 42, the circular convex portion 45 abuts on the cylindrical portion 215 of the first case member 21, and the movement to the counter-output side L2 is prevented. Further, in the driven gear 42, the convex portion 461 of the plate spring 46 is elastically brought into contact with the end surface on the counter-output side L2 of the cylindrical portion 227 of the second case member 22, and movement to the output side L1 is restricted. . Accordingly, the driven gear 42 and the output member 10 are prevented from rattling in the rotation center axis L direction.

(Operation)
In the geared motor 100 and the pointer type display device 200 configured as described above, when the pointer 11 is stopped at the zero point (origin position) and the coil 8 is supplied with power through the terminal pin 70, the rotor 5 rotates. The rotation is transmitted to the output member 10 through the gear train 4. Accordingly, the pointer 11 connected to the output member 10 rotates clockwise CW. At that time, by inputting a predetermined number of drive pulses to the coil 8, the angular position of the pointer 11 is switched, and the pointer 11 can be rotated clockwise CW to the target position and then stopped. Further, if a driving pulse for reverse rotation is supplied, the pointer can be rotated counterclockwise CCW to another target position.

(Configuration of stopper mechanism)
FIG. 6 is an explanatory diagram showing a planar configuration of the stopper mechanism 9 configured in the geared motor 100 to which the present invention is applied. In FIG. 6, the gear train 4 is indicated by a solid line, and the second case member 22 is indicated by a one-dot chain line.

  In FIG. 6, in the geared motor 100 of this embodiment, the pointer 11 shown in FIG. 1 rotates counterclockwise CCW between the driven gear 42 and the second case member 22 (support member) to set the zero point. When the instructed origin position is reached, the stopper contact portion 91 provided on the driven gear 42 is brought into contact with the stopper contact portion 92 provided on the second case member 22 so that the driven gear 42 A stopper mechanism 9 that defines a movable range in the counterclockwise CCW (one side around the rotation center axis L) is configured.

In this embodiment, the driven-side gear 42 has a gear-side convex portion 48 protruding outward in the radial direction on the outer peripheral surface of the body portion 44 protruding from the plate-like portion 43 to the output side L1 at the center of the driven-side gear 42. The stopper contact portion 91 is configured by an end portion 481 (one side end portion) positioned on the counterclockwise CCW side of the gear-side convex portion 48. Here, the gear-side convex portion 48 is formed integrally with the body portion 44 and is also formed integrally with the plate-like portion 43. Therefore, the gear-side convex portion 48 has a structure protruding from the plate-like portion 43 to the output side L1 (the second case member 22 side).

  In this embodiment, the plate-like portion 43 has plate-like springs 46 and grooves 47 formed at two locations in the circumferential direction, and the gear-side convex portion 48 corresponds to the space between the plate-like springs 46 adjacent in the circumferential direction. It is formed at an angular position. Accordingly, the radially outer end of the gear-side convex portion 48 is positioned radially outward from the radially inner portion of the groove 47, but the gear-side convex portion 48 and the groove 47 are displaced in the circumferential direction. Therefore, the gear-side convex portion 48 can be formed integrally with the trunk portion 44. In the present embodiment, the gear-side convex portion 48 has a planar shape in which the circumferential width dimension on the radially inner side is shorter than the circumferential width dimension on the radially outer side. For this reason, the rotatable angle range of the driven gear 42 is wide. However, the gear-side convex portion 48 has a configuration in which the circumferential width dimension on the radially inner side and the circumferential width dimension on the radially outer side are equal, or the circumferential width dimension on the radially inner side is the circumferential outer dimension. You may employ | adopt the structure longer than the width dimension of a direction.

  The second case member 22 has a support-side convex portion 28 that protrudes from the end plate portion 220 to the counter-output side L2, and the support-side convex portion 28 has a clockwise CW side (the other side around the rotation center axis L). ) End portion 281 (the other side end portion) constitutes the stopper contacted portion 92. Here, the support-side convex portion 28 protrudes from the inner peripheral surface of the cylindrical portion 227 toward the rotation center axis L of the driven gear 42 on the inner side of the cylindrical portion 227, and is radially outside the support-side convex portion 28. Are connected to the inner peripheral surface of the cylindrical portion 227.

In this embodiment, the support-side convex portion 28 has a substantially trapezoidal planar shape, and the circumferential width dimension is narrower on the radially inner side than on the radially outer side. That is, the support-side convex portion 28 protrudes radially inward from the inner peripheral surface of the cylindrical portion 227 along the extension line of the rib 224a inside the cylindrical portion 227, and the width of the support-side convex portion 28 on the radially outer side. The dimension W1 is equal to the width dimension of the rib 224a, whereas the width dimension W2 on the radially inner side is narrower than the width dimension of the rib 224a. That is, the width dimension W1 on the outer side in the radial direction and the width dimension W2 on the inner side in the radial direction of the support-side convex portion 28 are as follows: Width dimension W1> Width dimension W2
It has become.

  Further, the stopper contacted portion 92 (the end portion 281 of the support-side convex portion 28) is configured so that the driven gear 42 rotates counterclockwise CCW and the stopper contact portion 91 (the end portion of the gear-side convex portion 48). 481) is provided at a position where the driven gear 42 receives a reaction force in a direction away from the driving gear 41. More specifically, the stopper contacted portion 92 (the end portion 281 of the support-side convex portion 28) first determines the rotation angle range of the driven gear 42 as the rotation center (rotation center axis L) of the driven gear 42. And the rotation center (rotation center axis L5) of the drive side gear 41 are divided into a first angle range θ1 and a second angle range θ2 by an imaginary line L11. Is rotated in the counterclockwise direction CCW, the stopper contact portion 91 is disposed in the first angle range θ1 that moves in a direction approaching the rotation center of the drive side gear 41.

  Further, the stopper contacted portion 92 is provided in a range that forms an angle of 90 ± 60 ° with respect to the virtual line L11 when viewed from the rotation center of the driven gear 42. Especially in this form. The stopper contacted portion 92 is provided within a range that forms an angle of 90 ± 10 ° with respect to the virtual line L11 when viewed from the rotation center of the driven gear 42. For this reason, when the driven gear 42 rotates counterclockwise CCW and the stopper contact portion (the end 481 of the gear-side convex portion 48) contacts, the driven gear 42 is separated from the drive-side gear 41. Receiving the reaction force in the direction to do.

(Configuration of the interference unit 29 and the interfered unit 49)
When assembling the geared motor 100 of this embodiment, as shown in FIG. 3A, the second case member is provided with the motor unit 1, the gear train 4 and the output member 10 provided on the first case member 21 side. 22 are overlapped, and the hook 219 (joining part) is joined with the engaging convex part 229 (joined part). At this time, in order to avoid assembling the geared motor 100 in a state where the gear-side convex portion 48 and the support-side convex portion 28 are in contact with each other at the rotation center axis L, the driven-side gear 42 has a gear-side convex portion. When the first case member 21 and the second case member 22 are overlapped with each other in a state where the portion 48 and the support-side convex portion 28 overlap each other at the rotation center axis L, they interfere with the interference portion 29 of the second case member 22. An interfered part 49 is provided.

  In the present embodiment, the interfered part 49 is provided in the same angular direction with the rotation center axis L as the center with respect to the gear side convex part 48, and the interference part 29 is the rotation center axis with respect to the support side convex part 28. They are provided in the same angular direction with L as the center. Further, the interfered part 49 is provided at a position overlapping with the gear side convex part 48 in the rotation center axis L direction, and the interference part 29 is provided at a position overlapping with the support side convex part 28 in the rotation center axis L direction. Is provided.

  More specifically, the gear-side convex portion 48 is continuously provided over the entire rotation center axis L direction of the outer peripheral surface of the body portion 44, and the gear-side convex portion 48 is output on the rotation center axis L direction. The interfered portion 49 is configured by the end portion of L1 (the end portion on the second case member 22 side). Further, the support-side convex portion 28 is provided over the entire inner circumferential surface of the cylindrical portion 227 in the direction of the rotation center axis L, and the end of the support-side convex portion 28 on the counter-output side L2 in the rotation center axis L direction ( The interference part 29 is constituted by the end part on the plate-like part 43 side. That is, the sum of the height dimension of the gear-side convex portion 48 (dimension in the direction of the rotation center axis L) and the height dimension of the support-side convex portion 28 (dimension in the direction of the rotation center axis L) makes the geared motor 100 appropriate. This is considerably larger than the distance between the plate-like portion 43 of the driven gear 42 and the end plate portion 220 of the second case member 22 when assembled.

  Therefore, in the assembly process of the geared motor 100, when the first case member 21 and the second case member 22 are overlapped, if the gear side convex portion 48 and the support side convex portion 28 are displaced in the circumferential direction, the interference portion Since 29 does not interfere with the interfered part 49, the first case member 21 and the second case member 22 are appropriately overlapped. Accordingly, since the hook 219 (coupling portion) and the engaging convex portion 229 (coupled portion) are close to each other in the direction of the rotation center axis L, the hook 219 (coupling portion) and the engaging convex portion 229 (coupled portion) are connected. The first case member 21 and the second case member 22 can be coupled by being engaged. On the other hand, when the first case member 21 and the second case member 22 are overlapped, when the gear-side convex portion 48 and the support-side convex portion 28 overlap in the rotation center axis L direction, the interference portion 29 and The interfered part 49 interferes and a large gap is formed between the first case member 21 and the second case member 22. Therefore, the hook 219 (coupling portion) and the engagement convex portion 229 (coupled portion) are prevented from sufficiently approaching in the rotation center axis L direction. For this reason, since the hook 219 (joining part) and the engagement convex part 229 (joined part) cannot be joined, the first case member 21 and the second case member 22 cannot be joined.

(Main effects of this form)
As described above, in the geared motor 100 and the pointer-type display device 200 of this embodiment, the stopper that defines the movable range of the driven gear 42 when the driven gear 42 (output member 10) rotates counterclockwise CCW. A mechanism 9 is provided. Therefore, the position indicating the zero point of the pointer 11 can be defined with the position where the stopper mechanism 9 is operated as the origin position of the driven gear 42.

Further, in this embodiment, when the geared motor 100 is assembled, the first case member 21 and the second case are in a state where the gear-side convex portion 48 and the support-side convex portion 28 constituting the stopper mechanism 9 overlap in the direction of the rotation center axis L. When the member 22 is overlapped, the interference part 29 provided on the second case member 22 abuts on the interfered part 49 provided on the driven gear 42, and the first case member 21 and the second case member 22 are in contact with each other. There is a big gap between them. For this reason, the hook 219 (joining part) of the first case member 21 and the engaging convex part 229 (joined part) provided on the second case member 22 cannot be joined. Further, even if the first case member 21 is pressed, the hook 219 of the first case member 21 and the engaging convex portion 229 provided on the second case member 22 cannot be coupled. Therefore, it becomes difficult to couple the first case member 21 and the second case member 22 using the hooks 219 and the engaging projections 229. Therefore, even when the stopper mechanism 9 is provided between the driven gear 42 and the case 2, the geared motor 100 is assembled with the gear-side convex portion 48 and the support-side convex portion 28 in contact with each other in the direction of the rotation center axis L. This can be suppressed. Therefore, it is possible to prevent the geared motor 100 from being assembled in a state where the driven gear 42 is not rotatable. In addition, the hook 219 of the first case member 21 and the engagement convex portion 229 provided on the second case member 22 are largely separated in a state where the interference portion 29 and the interfered portion 49 are in contact with each other. As can be seen, the gear-side convex portion 48 and the support-side convex portion 28 overlap each other in the direction of the rotation center axis L. Accordingly, the second case member 22 is not strongly pressed toward the first case member 21 and the hook 219 and the engaging convex portion 229 are not coupled to each other, so that the plate-like portion 43 and the plate-like portion 43 of the driven side gear 42 are prevented. It is difficult for the gear side convex portion 48 provided on the end plate portion 220, the end plate portion 220 of the second case member 22 or the support side convex portion 28 provided on the end plate portion 220 to be deformed.

  In this embodiment, the interfered part 49 is provided in the same angular direction with the rotation center axis L as the center with respect to the gear side convex part 48, and the interference part 29 rotates with respect to the support side convex part 28. They are provided in the same angular direction with the central axis L as the center. In this embodiment, the dimension of the gear-side convex portion 48 in the direction of the rotation center axis L is increased, and the interfered portion 49 is configured by the end portion of the gear-side convex portion 48 on the second case member 22 side. Further, the size of the support-side convex portion 28 in the direction of the rotation center axis L is increased, and the interference portion 29 is configured by the end portion of the support-side convex portion 28 on the plate-like portion 43 side. For this reason, the interference part 29 and the interfered part 49 abut in the circumferential direction at an angular position different from the angular position where the gear side convex part 48 and the support side convex part 28 abut to prevent the driven side gear 42 from rotating. The situation does not occur. Further, since the gear-side convex portion 48 and the support-side convex portion 28 are extended in the direction of the rotation center axis L, the strength of the gear-side convex portion 48 and the support-side convex portion 28 is high. Therefore, deformation and damage of the gear-side convex portion 59 and the support-side convex portion 28 when the gear-side convex portion 48 abuts on the support-side convex portion 28 from the circumferential direction and the stopper mechanism 9 operates can be suppressed.

  The stopper contact portion 91 includes an end portion 481 of a gear side convex portion 48 formed integrally with the body portion 44 on the outer peripheral surface of the body portion 44 of the driven side gear 42. Therefore, the stopper contact portion 91 contacts the stopper contacted portion 92 at a position close to the rotation center axis L of the driven gear 42. Therefore, when the stopper mechanism 9 is operated, the collision energy received by the driven gear 42 is small, so that the rebound of the driven gear 42 can be suppressed. Therefore, when the pointer 11 is rotated counterclockwise CCW toward the zero point of the pointer 11 to indicate the zero point, it is difficult for the pointer 11 to fluctuate. Moreover, since the gear side convex part 48 is formed integrally with the plate-like part 43 of the driven gear 42, the strength of the gear side convex part 48 can be increased. The gear side convex portion 48 is formed integrally with the body portion 44 on the outer peripheral surface of the body portion 44 of the driven side gear 42 and is formed on the entire outer surface of the body portion 44 in the direction of the rotation center axis L. ing. For this reason, the intensity | strength of the gear side convex part 48 can be enlarged.

  Further, the plate-like portion 43 is formed with plate-like springs 46 at a plurality of locations in the circumferential direction, but the gear-side convex portion 48 is at an angular position corresponding to between the plate-like springs 46 adjacent in the circumferential direction. Is formed. Accordingly, even when the plate-like spring 46 is formed on the plate-like portion 43, the restriction on the position where the gear-side convex portion 48 is formed is small. Therefore, it is easy to provide the gear-side convex portion 48 on the inner side in the radial direction.

  On the other hand, the stopper contact portion 92 is an end portion 281 of the support-side convex portion 28 that protrudes from the radially outer side toward the radially inner side toward the rotation center of the driven gear 42, and the support-side convex portion 28. The width dimension in the circumferential direction is narrower on the radially inner side than on the radially outer side. For this reason, even when the circumferential width of the support-side convex portion 28 is increased to some extent and the strength is ensured, when the stopper mechanism 9 is operated, the stopper contact portion is located at a position close to the rotation center of the driven gear 42. 91 and the stopper contacted portion 92 abut. Therefore, when the stopper mechanism 9 is operated, the collision energy received by the driven gear 42 is small, so that the rebound of the driven gear 42 can be suppressed. Therefore, when the pointer 11 is rotated counterclockwise CCW toward the zero point of the pointer 11 to indicate the zero point, it is difficult for the pointer 11 to fluctuate.

  Further, since the circumferential width dimension of the support-side convex portion 28 is narrower on the radially inner side than on the radially outer side, the movable range of the driven gear 42 to the counterclockwise CCW can be widened. Further, the support-side convex portion 28 is integrally formed with the cylindrical portion 227 on the radially inner side from the cylindrical portion 227. Therefore, the strength of the support-side convex portion 28 (stopper contacted portion 92) can be increased. Further, the support-side convex portion 28 is formed integrally with the cylindrical portion 227 on the inner peripheral surface of the cylindrical portion 227 and is formed on the entire inner peripheral surface of the cylindrical portion 227 in the direction of the rotation center axis L. For this reason, the intensity | strength of the support body side convex part 28 can be enlarged.

  Further, the stopper mechanism 9 is configured between a driven gear 42 that rotates integrally with the output member 10 and the second case member 22. Therefore, the movable range of the counterclockwise CCW of the output member 10 (pointer 11) can be directly defined by the stopper mechanism 9.

[Modification 1]
FIG. 7 is an explanatory diagram of the driven gear 42 used in the geared motor 100 according to the first modification of the present invention. Note that the basic configuration of this example and Modification 2 described later is the same as that of the above-described embodiment, and therefore, common portions are denoted by the same reference numerals and description thereof is omitted. In the above embodiment, the gear side convex portion 48 and the interfered portion 49 used in the stopper mechanism 9 are integrated, but as shown in FIG. The aspect which consists of two convex parts spaced apart in the rotation center axis line L direction may be sufficient.

[Modification 2]
FIG. 8 is an explanatory diagram of the driven gear 42 used in the geared motor 100 according to the second modification of the present invention. In the above embodiment, when the first case member 21 and the second case member 22 are overlapped with each other in a state where the gear-side convex portion 48 and the support-side convex portion 28 overlap each other in the direction of the rotation center axis L, the interference portion 29. And the interfered part 49 are in contact with each other, and the hook 219 (coupled part) of the first case member 21 and the engaging convex part 229 (coupled part) provided on the second case member 22 are separated. However, in this embodiment, the interfered part 49 is a slope inclined in the circumferential direction. Although not shown, the interference part 29 is a slope inclined in the opposite direction to the interfered part 49. For this reason, when the first case member 21 and the second case member 22 are overlapped in a state where the gear-side convex portion 48 and the support-side convex portion 28 overlap in the direction of the rotation center axis L, the interference portion 29 and the interfered portion are interfered with. The driven gear 42 rotates in the circumferential direction by contacting the portion 49. For this reason, since the state where the gear-side convex portion 48 and the support-side convex portion 28 overlap in the rotation center axis L direction can be eliminated, the gear-side convex portion 48 and the support-side convex portion 28 are aligned in the rotation center axis L direction. Assembling of the geared motor 100 in a state where it abuts on can be suppressed. Therefore, it is possible to prevent the geared motor 100 from being assembled in a state where the driven gear 42 is not rotatable.

[Other embodiments]
In the embodiment described above, the stopper mechanism 9 is provided between the second case member 22 and the driven gear 42 (second gear) in the case 2 (support member). However, the first case member 21 and the driven side are provided. The stopper mechanism 9 may be provided between the gear 42 (second gear). In this case, the second case member 2
2 corresponds to a first support member, and the first case member 21 corresponds to a second support member.

  In the above embodiment, the interfered part 49 is provided in the same angular direction with the rotation center axis L as the center with respect to the gear side convex part 48, and the interference part 29 is the center of rotation with respect to the support side convex part 28. The interference part 49 may be provided in different angular directions centered on the rotation center axis L with respect to the gear-side convex part 48 in this case. The interference part 29 is provided in different angular directions around the rotation center axis L with respect to the support-side convex part 28. In this embodiment, the gear-side convex portion 48 is formed integrally with the trunk portion 44. However, the present invention is applied when the gear-side convex portion 48 is provided at a position spaced radially outward from the trunk portion 44. May be applied.

  In the above embodiment, the first case member 21 is provided with the hook 219 as the coupling portion, and the second case member 22 is provided with the engaging convex portion 229 as the coupled portion, but the first case member 21 is associated with the coupling portion as the coupling portion. A mating convex portion may be provided, and a hook may be provided on the second case member 22 as a coupled portion. Further, the first case member 21 may be provided with a first flange portion as a coupling portion, and the second case member 22 may be provided with a second flange portion overlapping the first flange portion in the direction of the rotation center axis L as a coupled portion. .

  In the above embodiment, the stopper mechanism 9 is configured between the driven gear 42 and the second case member 22, but the stopper mechanism 9 is configured between the drive gear 41 and the second case member 22. In this case, the present invention may be applied.

  In the above embodiment, the gear train 4 has two gears (the driving gear 41 and the driven gear 42) in addition to the pinion 58. However, the gear train 4 has two gears including the pinion 58. In some cases, the present invention may be applied when the gear train 4 includes four or more gears including the pinion 58.

  In the above embodiment, the geared motor 100 is applied to the pointer type display device 200. However, the present invention may be applied to other than the geared motor 100 for the pointer type display device.

  In the above embodiment, the support-side convex portion 28 is integrally formed with the cylindrical portion 227 of the second case member 22. However, in the case where the cylindrical portion 227 is not formed, the support-side convex portion 28 is You may employ | adopt the structure currently formed integrally with the end plate part 220 only.

  In the above embodiment, the support body is the case 2 including the first case member 21 and the second case member 22. However, in the support body, one of the first case member 21 and the second case member 22 is the case member. Thus, the present invention may be applied when the other is made of a ground plate or the like.

DESCRIPTION OF SYMBOLS 1 ... Motor part, 2 ... Case (support), 4 ... Gear train, 5 ... Rotor, 6 ... Stator, 9 ... Stopper mechanism, 10 ... Output member, 11 ... Pointer, 21 ...・ First case member (first support member), 22. ・ Second case member (second support member), 28. ・ Support side convex portion, 29 ... Interference portion, 41 ... Drive side gear (second gear) ), 42 .. Driven side gear (first gear), 43... Plate-like portion, 44... Body portion, 46... Plate spring, 48. ..Abutting portion for stopper, 92 ..Abutted portion for stopper, 100 ..Geared motor, 200 ..Pointer type display device, 219 ..Hook (coupling portion), 229. · · · · · · Cylindrical portion (cylinder portion), 281 · · · end of the support side convex portion, 481 · · · end portion of the gear side convex portion, L · · output portion Rotation center axis line of the (driven gear)

Claims (10)

A motor section;
An output member;
A gear train for transmitting rotation of the motor unit to the output member;
A support that supports the gear train;
Have
The support includes a first support member including a coupling portion, and a second support member including a coupled portion coupled to the coupling portion in a state where the gear train is supported between the first support member and the first support member. Have
Any of the gears included in the gear train includes: a plate-like portion having teeth formed on an outer peripheral surface; and a gear-side convex portion for a stopper protruding from the plate-like portion toward the second support member. Prepared,
The second support member includes a support-side convex portion for a stopper that protrudes toward the plate-like portion and contacts the gear-side convex portion from the circumferential direction when the gear rotates.
When the first support member and the second support member are overlapped with each other in a state where the gear side convex portion and the support side convex portion overlap with each other in the rotation center axis direction of the gear, A geared motor comprising: an interference portion that is in contact with an interference portion provided on a member in the direction of the rotation center axis to disable the coupling between the coupling portion and the coupled portion. A motor section;
An output member;
A gear train for transmitting rotation of the motor unit to the output member;
A support that supports the gear train;
Have
The support includes a first support member including a coupling portion, and a second support member including a coupled portion coupled to the coupling portion in a state where the gear train is supported between the first support member and the first support member. Have
Any of the gears included in the gear train includes: a plate-like portion having teeth formed on an outer peripheral surface; and a gear-side convex portion for a stopper protruding from the plate-like portion toward the second support member. Prepared,
The second support member includes a support-side convex portion for a stopper that protrudes toward the plate-like portion and contacts the gear-side convex portion from the circumferential direction when the gear rotates.
When the first support member and the second support member are overlapped with each other in a state where the gear side convex portion and the support side convex portion overlap with each other in the rotation center axis direction of the gear, A geared motor comprising: an interference portion provided on a member; and an interfered portion configured to abut on the rotation center axis direction to rotate the gear. The interfered part is provided in the same angular direction centered on the rotation center axis with respect to the gear-side convex part,
The geared motor according to claim 1, wherein the interference portion is provided in the same angular direction with the rotation center axis as a center with respect to the support-side convex portion. The interfered portion is provided at a position overlapping the gear side convex portion in the rotation center axis direction,
The geared motor according to claim 3, wherein the interference portion is provided at a position overlapping with the support-side convex portion in the rotation center axis direction. The interfered part is an end of the gear side convex part on the second support member side,
The geared motor according to claim 4, wherein the interference portion is an end portion on the plate-like portion side of the support-side convex portion. The gear includes a body portion projecting from the center of the plate-shaped portion toward the second support member,
The geared motor according to claim 5, wherein the gear-side convex portion is provided integrally with the body portion on an outer peripheral surface of the body portion.   The geared motor according to claim 6, wherein the gear-side convex portion is provided over the entire outer circumferential surface of the body portion in the rotation center axis direction. The second support member includes a cylindrical portion surrounding the body portion,
The geared motor according to claim 6 or 7, wherein the support-side convex portion is provided integrally with the cylindrical portion on an inner peripheral surface of the cylindrical portion.   The geared motor according to claim 8, wherein the support-side convex portion is provided over the entire inner circumferential surface of the cylindrical portion in the rotation center axis direction. A pointer-type display device comprising the geared motor according to any one of claims 1 to 9,
A pointer-type display device having a pointer held by the output member.

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