JP2015227127A - Gear structure of electric storage unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a fracture in a gear by preventing gear mouth opening even when an external force axially acts on the gear supported by a rotating shaft.SOLUTION: An insertion hole 42C, into which a rotating shaft 43 is to be inserted, is formed in a gear 42. An outer peripheral surface of the rotating shaft 43 is provided with a protrusion 43d for suppressing axial displacement of the gear 42 by protruding in a radial direction and abutting on a side surface of the gear 42.

Description

  The present invention relates to a gear structure of an electric storage unit provided in, for example, a vehicle side mirror disposed on a side portion of a vehicle.

  Conventionally, a vehicle side mirror attached to a side portion of a vehicle includes a base portion fixed to the vehicle, a mirror housing that holds the mirror, and a mirror housing that is rotatably connected to the base portion. An electric storage unit for switching the housing between a use state and a storage state is provided (see, for example, Patent Document 1).

  The electric storage unit includes a support shaft that is fixed to the base portion, and a drive case that is rotatably supported by the support shaft, and the drive case is fixed to the mirror housing. The drive case includes a motor, a first worm fixed to the output shaft of the motor, a rotation shaft that supports a worm wheel that meshes with the first worm, and a second worm provided on the rotation shaft. A drive mechanism is accommodated. The rotational force of the motor is a force that rotates the drive case around the support shaft through the first worm, the worm wheel, and the second worm, and the mirror housing is switched between the use state and the retracted state.

JP 2001-151020 A

  By the way, when supporting a worm wheel on a rotating shaft, it is necessary to suppress a positional shift in the axial direction with respect to the rotating shaft of the worm wheel. In contrast, for example, a tapered shape is provided on the outer peripheral surface of the rotating shaft, while a tapered shape that matches the tapered shape of the rotating shaft is provided on the inner peripheral surface of the hole into which the rotating shaft is inserted in the worm wheel. It is conceivable that the positional deviation in the axial direction with respect to the rotation axis of the worm wheel is suppressed by fitting the taper shape of this to the taper shape of the worm wheel.

  However, when the electric storage unit is operated over and over again, the bearing surface on the case side that supports the rotating shaft wears and the rotating shaft moves in the axial direction, which causes the worm wheel to move to the inner surface of the case. May approach. In this state, for example, when external force acts on the mirror housing and rotational force acts from the output side, the inner surface of the case comes into contact with the worm wheel due to dimensional variation and the worm wheel is pushed in the axial direction by the inner surface of the case. . At this time, since the taper shape of the rotating shaft is fitted in the hole of the worm wheel, a force is applied to expand the hole of the worm wheel, and the worm wheel may be opened and eventually cracked. .

  The present invention has been made in view of such points, and an object of the present invention is to prevent the gear from opening even if an external force acts on the gear supported by the rotating shaft in the axial direction. It is in suppressing cracking.

  In order to achieve the above object, in the present invention, the axial positioning is performed by supporting the gear from the side.

The first invention is
In the gear structure of the electric storage unit configured to switch the mirror housing to which the mirror is mounted between the storage state and the use state,
A gear to which the rotational force of the motor is input,
A rotating shaft that supports the gear;
A support member that rotatably supports the rotating shaft,
The gear is formed with an insertion hole into which the rotating shaft is inserted,
The outer peripheral surface of the rotating shaft is provided with a projecting portion for projecting in the radial direction and coming into contact with the side surface of the gear to suppress positional deviation in the axial direction of the gear.

  According to this configuration, the protruding portion of the rotating shaft comes into contact with the side surface of the gear while the rotating shaft is inserted into the gear insertion hole. In this state, for example, when an external force in the axial direction acts on the gear, the side surface of the gear is supported by the protruding portion, and the gear is prevented from being displaced in the axial direction. Since the force acts on the side surface of the gear, unlike the case where the tapered shape is provided, the force in the direction of expanding the insertion hole does not act, and the opening and cracking of the gear are suppressed.

According to a second invention, in the first invention,
The rotating shaft is made of a metal material, and the shaft-side flat surface is formed on the outer peripheral surface of the rotating shaft.
A gear side flat surface formed along the shaft side flat surface is formed on the inner peripheral surface of the gear insertion hole,
The protruding portion is integrally formed by forging at an axial edge portion of the rotating shaft on the shaft-side flat surface.

  According to this configuration, the shaft-side flat surface and the gear-side flat surface are brought into contact with each other in a state where the rotating shaft is inserted into the gear insertion hole, thereby preventing idle rotation of the gear. When forming this shaft side flat surface, it is necessary to remove a part of the material constituting the rotating shaft from the outer peripheral surface, but in this invention, the protruding portion is integrally formed by forging at the edge of the shaft side flat surface. Therefore, it is possible to use the material that would be removed by a normal molding method for forming the protrusion.

According to a third invention, in the first or second invention,
A gear side contact surface extending in the radial direction is formed on a side surface of the gear,
The protruding portion is formed with a shaft-side contact surface that extends in a radial direction of the rotating shaft and contacts the gear-side contact surface.

  According to this configuration, since both the gear side contact surface and the shaft side contact surface extend in the radial direction, the side surface of the gear is reliably supported while being in contact with each other.

  According to the first aspect of the invention, since the projecting portion that contacts the side surface of the gear is provided on the outer peripheral surface of the rotating shaft, the force in the direction of expanding the insertion hole of the gear when an external force in the axial direction acts on the gear. Can not work. Thereby, the opening and cracking of the gear can be suppressed.

  According to the second invention, when the shaft-side flat surface is formed on the outer peripheral surface of the rotating shaft, the protruding portion is integrally formed on the edge of the shaft-side flat surface by forging. The protrusion can be provided by using a material that is removed from the outer peripheral surface when forming, and the material can be effectively used.

  According to the third invention, the gear side contact surface extending in the radial direction is formed on the side surface of the gear, and the shaft side contact surface extending in the radial direction is formed on the projecting portion of the rotating shaft. The side of the gear can be reliably supported without being expanded.

It is a perspective view in case the side mirror for vehicles concerning an embodiment is in use. It is the figure which looked at the side mirror for vehicles concerning an embodiment from back. It is a disassembled perspective view of an electric storage unit. It is a perspective view of a driven gear and a rotating shaft. It is a perspective view of a rotating shaft. It is a top view of a driven gear and a rotating shaft. It is the VII-VII sectional view taken on the line in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a perspective view showing a part of a vehicle to which a vehicle side mirror 1 having an electric storage unit 6 (shown in FIG. 3) according to an embodiment of the present invention is attached. The side mirror 1 is a so-called door mirror that is used to confirm the driver's rear and is attached to the outer panel P of the front door F.

  In the following description, the right side mirror 1 will be described, but the left side mirror has the same configuration as that of the right side mirror 1 except that it is bilaterally symmetric. To do. Further, the present invention can also be applied to a side mirror that is used by being attached to the front end portion of a sash (not shown).

  In the description of this embodiment, for convenience of explanation, the front side of the vehicle is simply referred to as “front”, the rear side of the vehicle is simply referred to as “rear”, and the left side in the vehicle width direction is simply referred to as “left”. The right side in the vehicle width direction is simply called “right”.

  As shown in FIG. 2, the side mirror 1 includes a rear-viewing mirror 2, a base portion 3 attached to the outer panel P, a mirror housing 4 to which the mirror 2 is attached, and an angle adjustment unit that adjusts the angle of the mirror 2. (Not shown) and an electric storage unit 6 (an exploded view is shown in FIG. 3) for switching the mirror housing 4 between a storage state and a use state.

  As shown in FIG. 2, the mirror 2 has a shape that is long in the left-right direction. Although not shown, a heater is provided on the back surface of the mirror 2.

  The base portion 3 is fastened and fixed to the outer panel P by a fastening member (not shown), and extends obliquely upward to the right while being fixed to the outer panel P. A storage unit 6 is fixed to the upper portion of the base portion 3. Between the base portion 3 and the outer panel P, a waterproof seal rubber (not shown) is disposed.

  The mirror housing 4 includes a housing body 25, an upper visor B1, and a lower visor B2. The housing body 25, the upper visor B1, and the lower visor B2 are formed by molding a resin material. The structure of the mirror housing 4 is not limited to the above structure.

  The housing body 25 has a shape that is long in the left-right direction corresponding to the shape of the mirror 2. On the rear side of the housing body 25, a recess 26 that is long in the left-right direction for accommodating the mirror 2 and the angle adjustment unit is formed to open rearward.

  Although not shown, the angle adjustment unit includes a drive mechanism that drives a mirror holder (not shown) to which the mirror 2 is fixed. The mirror holder is supported by the drive mechanism via a pivot sphere of the drive mechanism. The drive mechanism is fastened and fixed to the bottom wall portion of the recess 26 of the mirror housing 4. The angle of the mirror 2 can be adjusted by the drive mechanism tilting the mirror holder.

  The electric storage unit 6 can switch the mirror housing 4 between a storage state and a use state by operating a button in the vehicle compartment.

  The retracted state of the mirror housing 4 is a posture in which the right end of the mirror housing 4 approaches the window glass of the front door F and the mirror surface of the mirror 2 extends in the front-rear direction, and the used state is as shown in FIG. Further, the right end of the mirror housing 4 is away from the window glass, and the mirror surface of the mirror 2 extends in the left-right direction.

  As shown in FIG. 3, the storage unit 6 includes a resin support shaft 40 fixed to the base portion 3 and a resin drive case 50 fixed to the mirror housing 4. The support shaft 40 extends in the vertical direction. A mounting seat 41 having a larger diameter than the upper outer diameter is provided at the lower portion of the support shaft 40. On the upper surface of the mounting seat 41 of the support shaft 40, fixed-side convex portions 57, 57 are provided at intervals in the circumferential direction of the support shaft 40.

  The mounting seat 41 is fixed to the base portion 3 using a fastening member or the like. The upper side of the mounting shaft 41 of the fixed shaft 40 is configured by a small-diameter cylindrical portion 41a extending upward. A plurality of teeth 41b are formed on the outer peripheral surface of the cylindrical portion 41a at intervals in the circumferential direction.

  The drive case 50 is divided into two in the vertical direction, and includes a lower case member 51 and an upper case member 52. The entire upper side of the lower case member 51 is open. A claw 51 a is formed on the outer surface of the lower case member 51. Further, the entire lower side of the upper case member 52 is open. On the outer surface of the upper case member 52, an engaging portion 52a with which the claw 51a is engaged is formed. In a state where the lower case member 51 and the upper case member 52 are combined, the claw 51a is engaged with and integrated with the engaging portion 52a.

  A circular through hole (not shown) into which the cylindrical portion 41 a of the support shaft 50 is inserted is formed in the bottom wall portion of the lower case member 51. Most of the cylindrical portion 41 a is accommodated in the drive case 50.

  A support hole 52c is formed in the upper wall portion 52b of the upper case member 52 immediately above the through hole in the bottom wall portion. The upper end portion of the cylindrical portion 41a of the support shaft 50 is supported in the support hole 52c in a state where the upper end portion is rotatably inserted. The drive case 50 is supported so as to be rotatable about the axis with respect to the support shaft 40 in a state where the cylindrical portion 41a of the support shaft 40 is inserted into the through hole of the bottom wall portion and the support hole 52c of the upper wall portion 52b. The

  A drive mechanism for driving the mirror housing 4 is accommodated in the drive case 50. The drive mechanism constitutes a part of the electric storage unit 6, and a motor M provided with a drive gear G composed of a worm gear on the output shaft, and a rotational force of the motor M that is engaged with the drive gear G are input. A resin driven gear 42 made of a worm wheel, a rotating shaft 43 that supports the driven gear 42, and a sun gear 44 made of a worm wheel provided at the lower end of the cylindrical portion 41a of the support shaft 40 are provided. . The motor M is controlled by the control device 45.

  The motor M is accommodated in the drive case 50 in a posture state in which the output shaft extends in the vertical direction and the output shaft protrudes downward. A motor holder 46 that holds the motor M is accommodated in the drive case 50. The motor holder 46 is fixed to the drive case 50 while being accommodated in the drive case 50. The motor holder 46 has a main body plate portion 46 a formed so as to cover the outer peripheral surface of the motor M.

  Support plate portions 46b and 46b for rotatably supporting both end portions of the rotating shaft 43 are formed on the lower portion of the main body plate portion 46a of the motor holder 46 so as to protrude. The support plate portions 46b and 46b are substantially parallel to each other and extend in the vertical direction.

  A cutout 46c is formed in the support plate 46b. The heights of the notches 46c and 46c are set to be substantially the same. The end of the rotating shaft 43 is fitted in the notch 46c in the radial direction. The shape of the notch 46c is a shape that can support the rotating shaft 43 so that the end of the rotating shaft 43 is fitted and does not come out in the radial direction. In a state where the end of the rotating shaft 43 is fitted into the notch 46c, the rotating shaft 43 can rotate. The motor holder 46 is a support member of the present invention.

  The rotary shaft 43 is in a posture extending in the horizontal direction and is supported by the motor holder 46. The rotating shaft 43 is made of a metal material. As shown in FIGS. 4 and 5, a worm 43 a is integrally formed with the main body portion of the rotating shaft 43 on the rotating shaft 43 from the vicinity of the central portion in the axial direction to the vicinity of one end side (the left side in FIGS. 4 and 5). ing. On the other end side (the right side in FIGS. 4 and 5) of the rotation shaft 43, a small diameter portion 43b having a smaller diameter than other portions is formed. The rotary shaft 43 is supported by the motor holder 46 at the one end side of the small diameter portion 43b and the worm 43a.

  A portion of the rotating shaft 43 between the worm 43 a and the small diameter portion 43 b is inserted into the insertion hole 42 c of the driven gear 42. As shown in FIGS. 5 and 7, two shaft-side flat surfaces 43 c and 43 c are formed on the outer peripheral surface of the rotating shaft 43 so as to be separated from each other in the circumferential direction. The shaft-side flat surface 43c has a shape in which a part of the outer peripheral surface of the rotating shaft 43 is cut away, and extends in the axial direction of the rotating shaft 43 from the vicinity of the small diameter portion 43b of the rotating shaft 43 toward the worm 43a side. Yes. The edge of the shaft side flat surface 43c on the worm 43a side is located away from the worm 43a.

  Further, on the outer peripheral surface of the rotating shaft 43, there are provided two projecting portions 43d and 43d that project in the radial direction and abut on the side surface (gear-side abutting surface 42e) of the driven gear 42. These protrusions 43d and 43d are for suppressing the displacement of the driven gear 42 in the axial direction from the normal assembly position. The protrusions 43d and 43d are separated from each other in the circumferential direction. Each protrusion 43d is integrally formed with an edge portion located on the worm 43a side of the shaft-side flat surface 43c.

  Each protrusion 43d is separated from the worm 43a and is formed across both edges in the width direction of the shaft-side flat surface 43c. The protrusion height of the protrusion 43d with respect to the outer peripheral surface of the rotation shaft 43 is set to be highest at the center in the circumferential direction of the rotation shaft 43 among the protrusions 43d and lower toward both ends.

  A surface formed on the small diameter portion 43b side in the projecting portion 43d is a shaft side contact surface 43e. The shaft-side contact surface 43e extends in the radial direction of the rotating shaft 43 and extends across both edges in the width direction of the shaft-side flat surface 43c. The angle formed by the shaft-side contact surface 43e and the shaft-side flat surface 43c is approximately 90 degrees.

  The surface on the worm 43a side in the protrusion 43d is a curved surface 43f. The curved surface 43f is curved so as to bulge toward the worm 43a, and is formed across both edges in the width direction of the shaft-side flat surface 43c.

  The rotating shaft 43 is forged, and shapes other than the worm 43a are formed during forging. In order to form the shaft side flat surface 43c, it is necessary to remove a part of the material constituting the rotation shaft 43 from the outer peripheral surface of the rotation shaft 43. In this embodiment, the shaft side flat surface 43c is removed during forging. The material removed for formation is moved to the edge of the shaft-side flat surface 43c and used for forming the protrusion 43d. The worm 43a is formed by rolling after molding of other shapes is completed.

  On the other hand, as shown in FIG. 4, a large number of teeth 41 b with which the drive gear G meshes are formed on the outer peripheral surface of the driven gear 42. The driven gear 42 is formed with a substantially cylindrical boss portion 42b. An insertion hole 42c into which the rotation shaft 43 is inserted is formed at the center of the boss portion 42b. A side surface of the boss portion 42b is a gear side contact surface 42e extending in the radial direction. As shown in FIG. 7, the shaft-side contact surface 43e comes into contact with the gear-side contact surface 42e.

  Two gear-side flat surfaces 42d formed along the shaft-side flat surface 43c are formed on the inner peripheral surface of the insertion hole 42c of the driven gear 42. The formation positions of the two gear-side flat surfaces 42d and 42d correspond to the shaft-side flat surfaces 43c and 43c. Further, the gear side flat surface 42d and the shaft side flat surface 43c have substantially the same shape. When the rotating shaft 43 is inserted into the insertion hole 42 c of the driven gear 42, the gear side flat surface 42 d and the shaft side flat surface 43 c come into contact with each other so that the driven gear 42 and the rotating shaft 43 are integrated, and the driven gear 42 with respect to the rotating shaft 43. Is prevented.

  Further, when the rotary shaft 43 is inserted into the insertion hole 42c of the driven gear 42, the gear side contact surface 42e and the shaft side contact surface 43e come into contact with each other. As a result, the driven gear 42 does not approach the worm 43a any more, and the axial displacement of the driven gear 42 with respect to the rotating shaft 43 is suppressed.

  As shown in FIG. 3, the sun gear 44 has a ring shape, and teeth are formed on the outer peripheral surface thereof. The teeth of the sun gear 44 mesh with the worm 43a of the rotating shaft 43. A cylindrical portion 41a of the support shaft 40 is inserted inside the sun gear 44, and the sun gear 44 is supported by the cylindrical portion 41a in this state. The sun gear 44 comes into contact with the inner surface of the bottom wall portion of the lower case member 51. A plurality of protrusions 44 a are formed on the inner surface of the sun gear 44 so as to be separated from each other in the circumferential direction.

  Further, a ring member 47, a coil spring 48, and a stopper ring 49 are accommodated in the drive case 50. The ring member 47, the coil spring 48, and the stopper ring 49 constitute a part of the electric storage unit 6.

  A cylindrical portion 41 a of the support shaft 40 is inserted inside the ring member 47. The ring member 47 is placed on the upper surface of the sun gear 44, and the lower side of the ring member 47 is inserted into the sun gear 44. A notch 47 a into which the projection 44 a of the sun gear 44 is fitted is formed below the ring member 47. Further, on the inner surface of the ring member 47, a protrusion 47 b that fits between the teeth 41 b of the cylindrical portion 41 a of the support shaft 40 is formed. Accordingly, the ring member 47 cannot rotate relative to the sun gear 44 in a state where the notch 47a is fitted in the projection 44a of the sun gear 44, and the projection 47b is fitted between the teeth 41b of the support shaft 40. Thus, the support shaft 40 is also relatively unrotatable. Thereby, the sun gear 44 is integrated with the support shaft 40 via the ring member 47.

  The coil spring 48 is an urging member for urging the drive case 50 downward (in the axial direction of the support shaft 40). The coil spring 48 is disposed so that the expansion and contraction direction thereof is the vertical direction, and the cylindrical portion 41 a of the support shaft 40 is inserted inside the coil spring 48. The lower end portion of the coil spring 48 is in contact with the upper surface of the ring member 47.

  A stopper ring 49 is fixed to the upper part of the cylindrical portion 41 a of the support shaft 40. The upper end portion of the coil spring 48 is in contact with the lower surface of the stopper ring 49. Therefore, the urging force of the coil spring 49 is transmitted to the lower case member 51 of the drive case 50 via the ring member 47 and the sun gear 44, and the bottom wall portion of the lower case member 51 is moved to the mounting seat 41 of the support shaft 40. It acts in the direction of pressing against the upper surface.

  Next, the operation of the electric storage unit 6 will be described. When the output shaft of the motor M rotates, the drive gear G rotates and the driven gear 42 is driven. Since the driven gear 42 is integrated with the rotating shaft 43, the rotating shaft 43 rotates and the worm 43a of the rotating shaft 43 rotates. Since the sun gear 44 is fixed, the drive case 50 rotates around the sun gear 44 (support shaft 40) by the rotation of the worm 43a. Thereby, the mirror housing 4 can be switched between the use state and the storage state.

  For example, it is considered that some unreasonable force acts on the drive case 50 from the outside, the inner surface of the drive case 50 contacts the driven gear 42, and the driven gear 42 is pushed in the axial direction of the rotary shaft 43 by the inner surface of the drive case 50. It is done. When the pressing direction of the driven gear 42 is a direction approaching the worm 43a of the rotating shaft 43, the shaft-side contact surface 43e of the protrusion 43d contacts the gear-side contact surface 42e of the driven gear 42, and the driven gear 42 The movement to the worm 43a side is suppressed as described above. At this time, since the protrusion 43d applies a force to the side surface of the driven gear 42, unlike the case where the tapered shape is provided, the force in the direction of expanding the insertion hole 42c does not act. Thereby, the opening and cracking of the driven gear 42 are suppressed.

  As described above, according to this embodiment, since the protrusion 43d that abuts the side surface of the driven gear 42 on the outer peripheral surface of the rotating shaft 43 is provided, opening and cracking of the driven gear 42 can be suppressed.

  Further, when the shaft-side flat surface 43c is formed on the outer peripheral surface of the rotating shaft 43, the projecting portion 43d is integrally formed on the edge of the shaft-side flat surface 43c by forging, so the shaft-side flat surface 43c is formed. In this case, the protrusion 43d can be provided by using the material removed from the outer peripheral surface, and the material can be used effectively.

  Further, since the gear-side contact surface 42e extending in the radial direction is formed on the side surface of the driven gear 42 and the shaft-side contact surface 43e extending in the radial direction is formed on the protrusion 43d of the rotating shaft 43, the insertion of the driven gear 42 is performed. The side surface of the driven gear 42 can be reliably supported without expanding the hole 42c.

  In addition, although the case where two protrusion parts 43d were formed was demonstrated in the said embodiment, it is not restricted to this, Although it is not illustrated, one protrusion part may be sufficient and three or more may be sufficient. One protrusion may be provided in an annular shape that is continuous in the circumferential direction of the rotating shaft 43.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the gear structure of the electric storage unit according to the present invention can be used for, for example, a vehicle side mirror disposed on a side portion of an automobile.

DESCRIPTION OF SYMBOLS 1 Vehicle side mirror 6 Electric storage unit 42 Driven gear 42c Insertion hole 42d Gear side flat surface 42e Gear side contact surface 43 Rotating shaft 43c Shaft side flat surface 43d Projection part 43e Shaft side contact surface 46 Motor holder (support member)
M motor

Claims (3)

In the gear structure of the electric storage unit configured to switch the mirror housing to which the mirror is mounted between the storage state and the use state,
A gear to which the rotational force of the motor is input,
A rotating shaft that supports the gear;
A support member that rotatably supports the rotating shaft,
The gear is formed with an insertion hole into which the rotating shaft is inserted,
The electric storage unit is characterized in that an outer peripheral surface of the rotating shaft protrudes in a radial direction, abuts against a side surface of the gear, and is provided with a protruding portion for suppressing positional deviation in the axial direction of the gear. Gear structure. In the gear structure of the electric storage unit according to claim 1,
The rotating shaft is made of a metal material, and the shaft-side flat surface is formed on the outer peripheral surface of the rotating shaft.
A gear side flat surface formed along the shaft side flat surface is formed on the inner peripheral surface of the gear insertion hole,
The gear structure of the electric storage unit, wherein the protruding portion is integrally formed by forging at an axial edge portion of the rotating shaft on the shaft-side flat surface. In the gear structure of the electric storage unit according to claim 1 or 2,
A gear side contact surface extending in the radial direction is formed on a side surface of the gear,
The gear structure of the electric storage unit, wherein the protruding portion is formed with a shaft-side contact surface that extends in a radial direction of the rotating shaft and contacts the gear-side contact surface.

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