JP6342255B2 - Geared motor - Google Patents

Description

  The present invention relates to a geared motor, and more particularly to a geared motor including a plate-like contact member having elasticity.

  Patent Document 1 below describes a motor-type drive device in which a switch contact piece (29) is held in a groove portion of a support member (25).

JP 2006-223557 A

  A conductive elastic body such as a thin metal plate is used as a contact member, and the contact member is bent in conjunction with the displacement of the output member to switch the contact between contact (ON) and separation (OFF). A mechanism for detecting and controlling an operation state is generally known.

  Such a contact member is usually fitted and held in a groove formed in a support member such as a case body, but when the adhesive is injected into the groove and the contact member is bonded and fixed, the adhesive leaks from the groove. There are things to do. When the adhesive leaks to the curved part side (contact part side) of the contact member, the adhesive adheres to the base end part of the curved part, thereby increasing the rigidity of the base end part, and the elastic deformation of the curved part. Becomes smaller. As a result, there is a problem that the deflection other than the base end portion with respect to the stress applied to the curved portion is increased and the contact member is easily broken.

  In this case, it may be possible to reduce the leakage of adhesive by simply lengthening the groove, but the groove needs to hold the contact member at a narrow pressure, so the gap volume after fitting the contact member is extremely small. The effect of reducing the amount of leakage cannot be obtained when the groove is slightly elongated. On the other hand, lengthening the groove to such an extent that the effectiveness is recognized will unnecessarily increase the size of the device.

  In view of the above problems, the problem to be solved by the present invention is that when the contact member is bonded and fixed to the groove portion, the adhesive injected into the groove portion does not leak to the curved portion side of the contact member, and the contact due to adhesion of the adhesive agent An object of the present invention is to provide a geared motor capable of preventing a reduction in the life of members.

  In order to solve the above problems, the geared motor of the present invention includes a support member that supports a switch contact piece that is a plate-shaped contact member having elasticity, and a part of the switch contact piece is fitted into the support member. The groove portion has a contact side holding portion for holding the contact side of the switch contact piece, a fixed side holding portion for holding a rear end side opposite to the contact side, and a groove width. A widened space portion, the space portion being provided between the contact-side holding portion and the fixed-side holding portion, and the switch contact piece being bonded and fixed to the fixed-side holding portion, the switch The contact piece is press-fitted into the contact-side holding portion, and the summary is that the contact-side holding portion and the fixed-side holding portion constituting one side surface of the groove portion are made of a single member having a continuous outer peripheral surface. .

  Since the groove width of the space portion is formed wider than the groove width of the fixed side holding portion or the contact side holding portion, a gap is formed between the side surface of the space portion and the switch contact piece. By providing such a gap in the space, more adhesive can be retained in the gap than the fixed side holding part and the contact side holding part. By providing such a space portion between the fixed side holding portion and the contact side holding portion, even if the adhesive injected into the fixed side holding portion spreads to the contact side of the switch contact piece, the space The progress can be hindered by the part. With this configuration, the amount of the adhesive reaching the contact side holding portion can be reduced, and the adhesive can be prevented from adhering to the proximal end portion of the switch contact piece.

  Since the fixed side holding portion and the contact side holding portion constituting one side surface of the groove portion are formed of a single member, the strength of these holding portions can be increased. Particularly, when the switch contact piece is press-fitted into the contact-side holding portion, it is possible to prevent the press-fit strength from being lowered due to the deformation of the contact-side holding portion.

  In addition, it is preferable that the bottom surface of the space is separated from the switch contact piece.

  A capillary force is generated in a slight gap between the contact surface between the groove and the switch contact piece. Therefore, when an adhesive having a low viscosity is injected into the fixed side holding portion, the adhesive may infiltrate the contact side of the switch contact piece due to capillary action. The capillary force between the switch contact piece and the side surface of the groove portion is broken by the space portion where the groove width is widened, but the capillary force between the switch contact piece and the bottom surface of the groove portion is maintained even in the space portion. There is a risk of infiltrating the contact side holding portion through the contact surface between the bottom surface of the space portion and the switch contact piece. By forming the bottom surface of the space portion deeply and separating the bottom surface of the space portion and the switch contact piece, the capillary force on the bottom surface of the space portion can be cut off.

  The groove portion further includes an intermediate holding portion that holds the switch contact piece between the contact side holding portion and the fixed side holding portion, and the space portion includes the fixed side holding portion and the intermediate holding portion. The first space portion provided between the first holding portion and the second space portion provided between the intermediate holding portion and the contact side holding portion, and the contact that constitutes one side surface of the groove portion The side holding part and at least one of the fixed side holding part and the intermediate holding part may be configured by a single member having a continuous outer peripheral surface.

  By providing double spaces, the adhesive that could not be retained in the first space is blocked by the intermediate holding part and the second space part, preventing the adhesive from entering the contact side holding part. can do.

  In this case, it is preferable that the bottom surface of at least one of the first space portion and the second space portion is separated from the switch contact piece.

  Further, the switch contact piece is overlapped with a terminal electrically connected to the outside in the thickness direction and fitted into the groove portion, and the terminal is more than a portion held by the contact side holding portion of the switch contact piece. It is good also as a structure piled up on the said rear end side.

  When the switch contact piece and the terminal are overlapped and brought into contact with each other so as to be electrically connected, a capillary force is generated on the contact surface. When the switch contact piece and the terminal are stacked over the entire length of the groove portion, the adhesive material having a low viscosity may infiltrate into these contact surfaces due to capillary action and leak out of the groove portion. Cut off the capillary force of the contact surface between the switch contact piece and the terminal in the space adjacent to the contact side holding part by configuring the range of the switch contact piece overlapped with the terminal only on the rear end side from the contact side holding part. And the above problem can be avoided.

  The support member may be formed by resin molding.

  Compared to the configuration of a groove portion in which only thin grooves are continuous, the portion of the mold corresponding to the space portion can be formed thicker, so that the strength of the die can be improved.

  According to the geared motor according to the present invention, when the contact member is bonded and fixed to the groove portion, the adhesive injected into the groove portion does not leak to the curved portion side of the contact member, and the life of the contact member is reduced due to adhesion of the adhesive. A geared motor that can be prevented can be provided.

It is the disassembled perspective view which looked at the drain valve drive device in this embodiment from the upper part. It is the disassembled perspective view seen from the downward direction of the drain valve drive device in this embodiment. It is a perspective view which shows the drain valve drive device in the state which closed the case body. It is a figure which shows the attachment state of a switch contact piece and a terminal. FIG. 5 is a cross-sectional perspective view of a portion surrounded by a circle A in FIG. 4. It is a permeation | transmission figure which shows the meshing state of the gear train of a drain valve drive device.

(overall structure)
Embodiments of a geared motor according to the present invention will be described below in detail with reference to the drawings. The geared motor in the present embodiment is a drain valve driving device 1 installed below the drum in the casing of the drum type washing machine. In the following description, the top and bottom refer to the top and bottom in FIG. 1 (the first case half 91 side is the top and the second case half 92 side is the bottom), and the outer peripheral surface is the case in FIG. It refers to a continuous set of side surfaces excluding the upper and lower surfaces of the body 90, and includes both side surfaces of the cylindrical portion 94.

  1 and 2 are exploded perspective views of the drain valve driving device 1 in the present embodiment. The drain valve driving device 1 in the present embodiment includes a motor 10 that is a driving source, a gear train 30 that is a power transmission unit that transmits a driving force of the motor 10 to a drain valve 95 that is a driven body, and a crank member 37. A case body 90 having a terminal piece 40 electrically connected to the outside, a first case half 91 and a second case half 92 divided vertically, and the internal space of the case body 90 vertically And a partition plate 93 which is a substantially plate-shaped member for partitioning.

  FIG. 3 is a perspective view showing the drain valve driving device 1 in a state where the first case half 91 and the second case half 92 are joined. The first case half 91 and the second case half 92 are provided on the outer peripheral surface of the first case half 91 on the outer peripheral surface of the first case half 91 and on the outer peripheral surface of the second case half 92. The locking hole 921 provided at a position corresponding to the locking claw 911 is engaged and fixed.

  In the present embodiment, a part of the partition plate 93 is exposed as the first connector half 931 from the first case half 91 to the outside, and the first connector half 931 and the first case are exposed. The upper case 90 a is configured with the half body 91. On the other hand, the lower case 90b is configured by only the second case half 92 (including the second connector half 922 which is a part of the member). That is, the case body 90 is composed of the upper case 90a and the lower case 90b, the upper case 90a is composed of the first case half 91 and the first connector half 931, and the lower case 90b is composed of the second case half. 92 (including the second connector half 922). In the present invention, the “upper case” means a member that covers and protects the case body from above, and the “lower case” means a member that covers and protects the case from below. The upper case and the lower case may be a single member or a combination of a plurality of members.

  A part of the terminal piece 40 is exposed from the outer peripheral surface of the case body 90. The terminal piece 40 is clamped at the proximal end portion of the cylindrical portion 94 formed by joining the first connector half 931 and the second connector half 922, and the exposed portion of the terminal piece 40 is covered by the cylindrical portion 94. As a result, a connector part is formed on the case body 90. With this configuration, the drain valve driving device 1 directly supports the terminal piece 40 by the case body 90 without providing a separate connector housing or the like. In the present invention, the “connector portion” means a terminal exposed to the outside of the case body and a portion of the case body in the vicinity of the terminal that supports and protects the terminal.

  Next, operation | movement of the drain valve drive device 1 in this embodiment is demonstrated. FIG. 5 is a perspective view showing a meshed state of the gear train 30 of the drain valve driving device 1. The motor 10 in the present embodiment is an AC motor that rotates only in one direction by a reverse rotation prevention mechanism. The gear train 30 includes a pinion 31 of the motor 10 as a first gear, a second gear 32, a third gear 33, a fourth gear 34, a fifth gear 35, and a sixth gear 36. The gears except the pinion 31 are compound gears in which a large-diameter gear and a small-diameter gear that are spur gears are formed in two stages. As shown in FIGS. 1 and 2, a crank member 37 that opens and closes the drain valve 95 is attached to the small-diameter gear of the sixth gear 36.

(Switch contact fixing structure)
Next, the fixing structure of the switch contact piece 421 of the drain valve driving device 1 will be described. FIG. 4 is a view showing a state where the switch contact piece 421 and the terminal 40 are attached, and FIG. 5 is a cross-sectional perspective view of a portion surrounded by a circle A in FIG.

  As shown in FIG. 4, the drain valve driving device 1 according to the present embodiment has two power source terminals 41 to which electric power is supplied from the outside, and two types of detecting the open / close state of the drain valve 95 from the rotation angle of the crank member 37. A signal terminal 42 is provided. Switch contact pieces 421 made of conductive metal pieces, which are elastic plate-like contact members, are electrically connected to each signal terminal 42 in the thickness direction, and are integrated by spot welding. The switch contact piece 421 and the signal terminal 42 are supported by two support members 60 formed on the bottom surface of the partition plate 93. The partition plate 93 and the support member 60 are members integrally formed by resin molding.

  Hereinafter, the shape of the support member 60 will be described with reference to FIG. The two support members 60 are actually protrusions formed so as to extend downward from the bottom surface of the partition plate 93. For convenience of explanation, the upper and lower sides in FIG.

  In the support member 60, a groove portion 60a having a depth from the upper surface to the approximate center in the height direction is formed along the longitudinal direction, and a part of the groove portion 60a is a deeper groove. A part of the switch contact piece 421 is supported by being fitted into the groove 60 a of the support member 60. The groove portion 60a includes a contact side holding portion 62 that holds the contact side of the switch contact piece 421, a fixed side holding portion 61 that holds the rear end side opposite to the contact side, and the contact side holding portion 62 and the fixed side. An intermediate holding part 63 that holds the switch contact piece 421 between the holding part 61, a first space part 65 that is provided between the fixed-side holding part 61 and the intermediate holding part 63, and whose groove width is widened; The second holding portion 66 is provided between the intermediate holding portion 63 and the contact-side holding portion 62 and similarly has a second space portion 66 having an enlarged groove width.

  Since the groove widths of the first space portion 65 and the second space portion 66 are formed wider than the groove widths of the holding portions, the side surfaces of the first space portion 65 and the second space portion 66 are in contact with the switch. A gap is formed between the piece 421 (and the signal terminal 42).

  The second space 66 is formed deeper than the bottom of the groove 60a on which the switch contact piece 421 and the signal terminal 42 are placed, so that the bottom surface of the second space 66, the switch contact 421, Are separated. Further, the heights of the contact side holding part 62 and the second space part 66 are stepwise lower than the heights of the intermediate holding part 63, the first space part 65, and the fixed side holding part 61 on the rear end side. Is formed.

  The switch contact piece 421 and the signal terminal 42 are bonded and fixed to the fixed side holding portion 61, and the switch contact piece 421 is press-fitted into the contact side holding portion 62. In order to allow the switch contact piece 421 to be press-fitted, the groove width of the contact side holding portion 62 is formed narrower than the groove width of the intermediate holding portion 63 or the fixed side holding portion 61.

  The contact-side holding part 62, the second space part 66, the intermediate holding part 63, the first space part 65, and the fixed-side holding part 61 constituting one side surface of the groove part 60a are a single member whose outer peripheral surface is continuous. It is formed with. The strength of each holding portion is increased by being formed of a single member. Particularly, the press-fit strength is reduced due to the deformation of the contact-side holding portion 62 when the switch contact piece 421 is press-fitted into the contact-side holding portion 62. Is prevented.

  As described above, the switch contact piece 421 and the signal terminal 42 are overlapped in the thickness direction and are fitted into the groove 60a. The signal terminal 42 is overlapped on the rear end side with respect to the portion held by the contact side holding portion 62 of the switch contact piece 421.

  In the present embodiment, an adhesive having a low viscosity is used for bonding and fixing the switch contact piece 421 and the signal terminal 42. When such an adhesive is injected into the fixed side holding portion 61, the capillary force generated in a slight gap in the contact surface between the switch contact piece 421 and the signal terminal 42, the side surface and the bottom surface of the groove 60a, the switch contact piece 421 and the signal terminal Due to the capillary force generated in a slight gap in the contact surface with 42, the adhesive infiltrates into the first space 65 side.

  Note that the adhesive used in the present embodiment is an instantaneous adhesive. By using instant adhesive, the waiting time for curing of the adhesive is suppressed to about 2 hours, and the effect on quality by leaving the work in progress before installation, such as the adhesion of dust inside the device, for a long time. Has been reduced.

  Capillary force on the contact surface between the side surface of the groove portion 60a and the switch contact piece 421 and the signal terminal 42 is cut off by the first space portion 65 whose groove width is widened. The adhesive that has flowed into the first space portion 65 is prevented from advancing by being retained in the gap of the first space portion 65.

  An adhesive that has been injected in a large amount and could not be retained in the gap of the first space portion 65, an adhesive infiltrated by the capillary force of the contact surface between the switch contact piece 421 and the signal terminal 42, or the bottom surface of the groove 60a The adhesive infiltrated by the capillary force on the contact surface between the switch contact piece 421 and the signal terminal 42 reaches the second space 66 via the intermediate holding part 63. Since the second space 66 has a deep bottom surface, the bottom surface is separated from the switch contact piece 421 and the signal terminal 42. Thereby, not only the capillary force of the contact surface between the side surface of the groove 60a and the switch contact piece 421 and the signal terminal 42 but also the capillary force generated on the contact surface with the bottom surface of the groove 60a is cut off. Further, since the signal terminal 42 does not reach the contact side holding portion 62, the capillary force on the contact surface between the switch contact piece 421 and the signal terminal 42 is also cut off in the second space portion 66. Furthermore, since the bottom surface of the second space 66 is deep, the volume of the gap for holding the adhesive is larger than that of the first space 65.

  In the present embodiment, since the space portion is provided double, the adhesive that could not be fastened by the first space portion 65 is blocked by the intermediate holding portion 63 and the second space portion 66. Thus, the adhesive can be prevented from entering the contact-side holding portion 62. Moreover, since the space part is formed in the groove part 60a, compared with the structure of the groove part where only the thin groove | channel continued, the metal mold | die of the part corresponding to a space part can be formed thickly, and the intensity | strength of a metal mold | die is raised. Yes.

(Operation)
Next, operation | movement of the drain valve drive device 1 in this embodiment is demonstrated. When electric power is supplied to the motor 10 shown in FIG. 6 and the pinion 31 rotates, the driving force thereof is the second gear 32, the third gear 33, the fourth gear 34, the fifth gear 35, and the sixth gear 36. Are transmitted in the order. Since the small-diameter tooth portion of each gear is engaged with the large-diameter gear of the next gear, the driving force of the motor 10 is decelerated and transmitted to the crank member 37 and the drain valve 95.

  Further, as shown in FIG. 4, the switch contact piece 421 is a cam follower whose tip is in sliding contact with the outer peripheral surface of the cam member 50. The outer peripheral surface of the cam member 50 includes a curved surface with a constant curvature, a curved surface with a smaller curvature, and a stepped portion in the order in which the switch contact piece 421 is slidably contacted. The step portion is provided at a position where the distance from the center of the cam member 50 to the circumference is the longest, and the distance from the center of the cam member 50 to the circumference is instantly shortened from the longest to the shortest by the step portion. It is done.

  The cam member 50 is inserted into a cylindrical portion formed between the large diameter gear and the small diameter gear of the sixth gear 36. The outer peripheral surface on the tip side of the cylindrical portion is partially cut out in a flat shape, and the insertion hole of the cam member 50 is also formed in the same shape. Therefore, the cam member 50 is inserted into the cylindrical portion of the sixth gear 36 and the crank member 37 is mounted on the small-diameter gear, so that the cam member 50 is fixed to the sixth gear 36 in the axial direction and the circumferential direction, As the sixth gear 36 rotates, the sixth gear 36 rotates.

  The switch contact pieces 421 come into contact with each other (ON state) when sliding on a curved surface having a smaller curvature on the outer peripheral surface of the cam member 50, and are separated by reaching the step portion (OFF state). The ON state and OFF state of the switch contact piece 421 are notified to a control device (not shown) connected to the outside via the signal terminal 42, and the power supply to the power supply terminal 41 is controlled by the control device.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Drain valve drive device 10 Motor 30 Gear train 37 Crank member 40 Terminal piece 41 Power supply terminal 42 Signal terminal 421 Switch contact piece 50 Cam member 60 Support member 60a Groove part 61 Fixed side holding part 62 Contact side holding part 63 Intermediate holding part 65 First One space portion 66 Second space portion 90 Case body 90a Upper case 90b Lower case 93 Partition plate 95 Drain valve

Claims (6)

A support member for supporting a switch contact piece that is a plate-like contact member having elasticity;
A groove portion into which a part of the switch contact piece is inserted is formed in the support member,
The groove portion includes a contact side holding portion for holding the contact side of the switch contact piece, a fixed side holding portion for holding a rear end side opposite to the contact side, and a space portion having an enlarged groove width, Have
The space portion is provided between the contact side holding portion and the fixed side holding portion,
The switch contact piece is bonded and fixed to the fixed side holding portion,
The switch contact piece is press-fitted into the contact side holding portion,
The geared motor, wherein the contact side holding portion and the fixed side holding portion constituting one side surface of the groove portion are formed of a single member having a continuous outer peripheral surface.   The geared motor according to claim 1, wherein a bottom surface of the space portion is separated from the switch contact piece. The groove portion further includes an intermediate holding portion for holding the switch contact piece between the contact side holding portion and the fixed side holding portion,
The space portion includes a first space portion provided between the fixed side holding portion and the intermediate holding portion, and a second space provided between the intermediate holding portion and the contact side holding portion. And consists of
The contact-side holding portion that constitutes one side surface of the groove portion, and at least one of the fixed-side holding portion and the intermediate holding portion are made of a single member having a continuous outer peripheral surface. Item 4. The geared motor according to item 1.   The geared motor according to claim 3, wherein a bottom surface of at least one of the first space portion and the second space portion is separated from the switch contact piece. The switch contact piece overlaps with a terminal electrically connected to the outside in the thickness direction and is fitted into the groove portion,
The geared motor according to any one of claims 1 to 4, wherein the terminal is overlapped on the rear end side with respect to a portion held by the contact side holding portion of the switch contact piece. .   The geared motor according to any one of claims 1 to 5, wherein the support member is formed by resin molding.

Images