JP2005170080A - Electric storage type door mirror device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the efficiency of assembling work and the accuracy of assembling at the time of assembling a worm shaft. <P>SOLUTION: This electric storage type door mirror device is constituted of an electric motor 2, a worm mechanism 1 and a gear mechanism 5 to play a role to transmit motive power from the electric motor 2, a base shaft 7 fixed on the door side and a holder 3 mounted free to take relative rotary motion relative to a shaft 71 of the base shaft 7, to mount a mirror housing 4 for storing a mirror and to store the electric motor 2 for rotationally moving the mirror housing 4 and the mirror around the shaft 71, the work mechanism 1 and the gear mechanism 5. Both shaft ends 133 of the work shaft 13 forming the worm mechanism 1 are formed of convex surfaces each having a radius of Ra, and a worm shaft supporting part 31 is formed of a concave surface having a radius of Rb so that Ra<Rb is established. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric retractable door mirror device, and in particular, an electric retractable door mirror that simplifies the structure of a thrust force receiving portion of a worm shaft in a worm mechanism that forms a power transmission device that performs a retracting operation. It relates to the device.

A conventional electric retractable door mirror device is, for example, as shown in Japanese Utility Model Publication No. 3-40253 or FIG. 6, a relative rotation motion with respect to a base shaft 10 attached to a door and a shaft portion 110 of the base shaft 10. A holder 30 that is integrally coupled to a mirror housing 20 to be attached, such as a mirror, and the like. A power transmission device 670 including a worm mechanism 60 and a gear mechanism 70 for transmitting power from the motor 50, and a gear mechanism 70 forming the power transmission device 670 are coupled to the shaft portion of the base shaft 10. 110 is a ring gear (sun gear) 910 that engages with 110, and is provided in the sun gear 910. Serial is made of the clutch mechanism 90 or the like which is mainly formed of the clutch member 920 which is mounted so as to not be relative rotational movement relative to the shaft portion 110. By adopting such a configuration, in the conventional system, when the electric motor 50 starts to operate, the worm mechanism 60 and the gear mechanism 70 rotate, and the power transmission device 670 and the electric motor 50 having the above-described configuration are rotated. Will rotate around the sun gear 910. As a result, the holder 30 itself and the mirror housing 20 in which the electric motor 50 and the power transmission device 670 are accommodated rotate around the shaft portion 110, and the storage operation of the door mirror device is performed. is there. In such a configuration, the worm shaft 630 forming the worm mechanism 60 is supported (attached) in the holder 30 at both ends thereof via balls (steel balls) 660. It is what has become. Thus, the thrust force generated in the worm shaft 630 when the worm mechanism 60 is operated is received.
Japanese Utility Model Publication No. 3-40253

  By the way, when the electric retractable door mirror device configured as described above starts operating, a thrust force is generated at the worm shaft 630 in the axial center line direction, and the worm wheel 620 provided coaxially. Due to the meshing action with the electric motor 50 side worm 610, a meshing reaction force in the direction perpendicular to the axis is generated on the worm shaft 630. Due to the lateral load based on the meshing reaction force, both shaft end portions of the worm shaft 630 are pressed against the side walls of the worm shaft support portion provided on the holder 30 side. As a result, during the rotational movement of the worm shaft 630, the axial center line of the worm shaft 630 and the position of the contact point between the steel balls 660 on both end surfaces of the worm shaft 630 are shifted. That is, during the operation of the worm mechanism 60, the worm shaft 630 rotates in an eccentric state. As a result, a roaring sound or the like is generated when the door mirror device is retracted. In addition, a part of the worm shaft support portion of the holder 30 that supports both ends of the worm shaft 630 is scraped off, that is, uneven wear occurs. In order to solve such problems, the steel ball for receiving the thrust force provided at both ends of the worm shaft is abolished, and the worm shaft has a simple structure that does not cause lateral displacement of the shaft end. It is an object (problem) of the present invention to provide an electric retractable door mirror device having a worm shaft thrust force receiving mechanism.

  In order to solve the above problems, the following measures are taken in the present invention. That is, in the first invention according to the first aspect of the present invention, an electric motor, a power transmission device including a worm mechanism and a gear mechanism that serve to transmit power from the electric motor, and a door are fixed. And a mirror housing to which the mirror is mounted are coupled, and the mirror housing and the mirror are rotated around the shaft. An electric retractable door mirror device comprising an electric motor to be driven and a holder for accommodating a power transmission device, both end portions of a worm shaft provided in a direction orthogonal to the rotation axis of the electric motor having a predetermined radius of curvature And has a convex shape, and is provided on the holder. The worm shaft support portion that supports the shaft end portion of the worm shaft and serves to receive the thrust force of the worm shaft has a radius of curvature different from the radius of curvature at the worm shaft end portion and is concave. It was decided to adopt a configuration that consisted of

  Next, in the second invention which is the invention according to the second aspect, in the electric retractable door mirror device according to the first invention, the curvature radius at the end portion of the worm shaft is formed on the holder. A configuration is adopted in which the value is smaller than the radius of curvature of the shaft support portion, and the center point of the radius of curvature of both is on the axial center line of the worm shaft.

  Next, in the third invention which is the invention described in claim 3, a power transmission device comprising an electric motor, a worm mechanism and a gear mechanism which serve to transmit power from the electric motor, and a door side. A fixed shaft and a mirror housing to which a mirror is attached are connected to each other, and the mirror housing and the mirror are rotated around the shaft. An electric retractable door mirror device comprising an electric motor to be moved and a holder for accommodating a power transmission device. Both shaft end portions of a worm shaft provided in a direction orthogonal to the rotation axis of the electric motor have a predetermined curvature. The worm has a radius and has a convex shape, and is provided on the holder, the worm The worm shaft support portion that supports both shaft end portions of the worm shaft and receives the thrust force of the worm shaft is formed of a compound curved surface having a concave shape or a conical receiving surface, and the worm shaft A configuration was adopted in which line contact was made with the convex surface formed at the shaft end of the.

  According to the first invention, it is possible to improve the efficiency of the work of assembling the worm shaft into the holder. That is, in the present invention, since the steel ball is eliminated, a complicated operation of accurately installing the steel ball in the worm shaft support portion of the holder is omitted. Further, according to the present invention, it is possible to suppress a lateral shift phenomenon at both shaft end portions of the worm shaft, which has been a concern in the prior art, and support on the holder side that supports the worm shaft shaft end portions. Occurrence of uneven wear and the like at the part can be suppressed.

  Further, according to the second invention, the position of the contact point between both end surfaces of the worm shaft and the concave surface portion of the worm shaft support portion of the holder automatically comes on the axial center line of the worm shaft, The centering action at the contact point is automatically performed. As a result, an assembling operation (assembly operation) with high accuracy and high work efficiency is performed.

  According to the third aspect of the invention, at least two or more contact operations are performed between the shaft end surfaces of the worm shaft and the concave surface of the worm shaft support portion provided on the holder side. Specifically, both will form a line contact. As a result, the surface pressure based on the thrust force at both contact portions is dispersed, and the friction loss during the rotational movement of the worm shaft can be reduced.

  The best mode for carrying out the present invention will be described with reference to FIGS. As shown in FIG. 1, the configuration of the present embodiment is fixed to the electric motor 2, the worm mechanism 1 and the gear mechanism 5 that play a role of transmitting power from the electric motor 2, and the door side. The base shaft 7 and the shaft portion 71 of the base shaft 7 are attached so as to be capable of relative rotational movement. The mirror housing 4 in which a mirror (not shown) is accommodated is attached and the mirror It is basically composed of the electric motor 2 for rotating the housing 4 and the mirror around the shaft portion 71, and the holder 3 for accommodating the worm mechanism 1 and the gear mechanism 5.

  In this structure, a clutch mechanism 6 including a clutch member 62 and a spring 63 is attached to the shaft portion 71 of the base shaft 7, and a ring gear (sun gear) is connected via the clutch mechanism 6. ) 61 is provided. The gear mechanism 5 is installed so as to mesh with and engage with the sun gear 61, and the sun gear 61 rotates around the sun gear 61. By adopting such a configuration, in the present embodiment, when the electric motor 2 starts operating, the worm mechanism 1 and the gear mechanism 5 rotate, and these rotate around the sun gear 61. You will exercise. Thereby, the holder 3 itself in which the electric motor 2 and the worm mechanism 1 and the gear mechanism 5 are accommodated, and the mirror housing 4 rotate around the shaft portion 71, and the door mirror device is retracted. Become.

  Of the worm shafts forming the worm mechanism 1, the worm shafts (worm shafts) 13 provided in the direction orthogonal to the rotation shaft 21 of the electric motor 2 are end portions of both shafts. 133 and 133 have hemispherical convex portions as shown in FIGS. 2 to 5. And the value of the curvature radius has a value of Ra. Also, the worm shaft support portion on the holder 3 side that serves to receive the thrust force generated in the worm shaft 13 by fitting both shaft end portions 133 and 133 of the worm shaft 13 having such a hemispherical shape. As shown in FIGS. 2 to 5, reference numeral 31 denotes a conical portion having a concave surface portion having a predetermined curvature radius (Rb) or the like, or having a predetermined taper surface, with the longitudinal section of the lower half side having a concave shape. It is formed by a concave portion having a shape. In addition, in what consists of such a structure, the relational expression of Ra <Rb is satisfied between Ra and Rb.

  A specific example (structure) of the worm shaft support portion 31 having such a concave surface will be described with reference to FIGS. As for the first embodiment, as shown in FIG. 3, both end portions 133 and 133 of the worm shaft 13 are formed in a hemispherical convex shape having a radius of curvature of Ra, The worm shaft support portion 31 formed on the holder 3 side has a concave shape having a radius of curvature of Rb. By adopting such a configuration, as shown in FIG. 2, when the worm shaft 13 starts to rotate in a state where it is installed in the holder 3, the shaft end portion 133 of the worm shaft 13 and the worm shaft on the holder 3 side. The position of the contact point (P0) with the concave surface portion formed by the support portion 31 automatically comes to the center position of the concave surface portion of the worm shaft support portion 31. That is, the centering function is exhibited. As a result, the center line (O1O1) does not move eccentrically when the worm shaft 13 is operated.

  Next, a second embodiment will be described with reference to FIG. The basic point of this is the same as that described in the first embodiment. In this structure, the structure of the worm shaft support portion 31 formed on the holder 3 side is such that the radius of curvature has a value of Rb1, and these are provided in an object shape around the shaft center line (O1O1). It is characterized by comprising a complex curved surface formed by two concave curved surfaces and one concave curved surface having a radius of curvature of Rb2. By adopting such a configuration (structure), the longitudinal cross-sectional form of the worm shaft 13 has two contact points P1 and P2. Therefore, during the rotational movement of the worm shaft 13, the contact form between the shaft end portion 133 of the worm shaft 13 and the worm shaft support portion 31 formed on the holder 3 side is a linear contact state, and the surface at the contact portion is The pressure value is reduced. As a result, the frictional resistance value is reduced, and the amount of frictional loss can be reduced during the rotational movement of the worm shaft 13 and the operation of the storage device.

  Next, a third embodiment will be described with reference to FIG. The basic point of this is the same as that of the second embodiment. The difference is that the structure of the worm shaft support portion 31 formed on the holder 3 side is made of a conical recess having a predetermined tapered surface. By making the concave shape of the worm shaft support part 31 to have such a form, the contact point becomes two points (P1, P2) as in the second embodiment, and the surface at the contact part The pressure value is reduced, and finally, the amount of friction loss is reduced.

  By adopting such a configuration, in the present embodiment, the assembling work into the worm shaft support portion 31 formed on the holder 3 side of the worm shaft 13 is performed smoothly and efficiently. Will come to be. As a result, it is possible to reduce the number of assembling steps of the entire electric retractable door mirror device, and thus to reduce the manufacturing cost. Further, the shaft end portion 133 of the worm shaft 13 assembled in this manner is supported by the worm shaft support portion 31 having a concave shape, and the thrust force generated in the worm shaft 13 is efficiently obtained. It will be accepted. Further, the centering function in the receiving portion prevents the worm shaft 13 from always shaking the shaft center line (O1O1), and can maintain a stable rotational motion. In addition, in the case where the concave surface of the worm shaft support portion 31 is formed of a compound curved surface or a conical surface, the surface pressure value at the contact portion can be reduced, and the worm shaft rotating motion can be reduced. The friction loss can be reduced.

It is a development perspective view showing the whole composition of the present invention. It is an expansion | deployment perspective view which shows the attachment structure of the worm shaft axial part which forms a worm mechanism part. It is a partial longitudinal cross-sectional view which shows the 1st Example regarding the engagement state between a worm shaft shaft edge part and a worm shaft support part. It is a partial longitudinal cross-sectional view which shows the 2nd Example regarding the engagement state between a worm shaft shaft edge part and a worm shaft support part. It is a partial longitudinal cross-sectional view which shows the 3rd Example regarding the engagement state between a worm shaft shaft edge part and a worm shaft support part. It is an expansion | deployment perspective view which shows the whole structure of a prior art example.

Explanation of symbols

1 Worm Mechanism 12 Worm Wheel 13 Worm Shaft 133 Shaft End 2 Electric Motor 21 Rotating Shaft 3 Holder 31 Worm Shaft Support 4 Mirror Housing 5 Gear Mechanism 6 Clutch Mechanism 61 Ring Gear (Sun Gear)
62 Clutch member 63 Spring 7 Base shaft 71 Shaft

Claims (3)

  An electric motor, a power transmission device composed of a worm mechanism, a gear mechanism, and the like serving to transmit power from the electric motor, a shaft fixed to the door side, and a relative rotational motion with respect to the shaft An electric storage comprising: a mirror housing to which a mirror is attached, and a holder housing an electric motor and a power transmission device for rotating the mirror housing and the mirror around the shaft. In the type door mirror device, both end portions of the worm shaft provided in a direction orthogonal to the rotation axis of the electric motor have a predetermined curvature radius and have a convex shape, and a holder The worm shaft axial end is supported and the thrust force of the worm shaft is reduced. The electric retractable type characterized in that the worm shaft support portion that plays the role of locking has a radius of curvature different from the radius of curvature at the end portion of the worm shaft, and has a concave shape. Door mirror device.   The electric retractable door mirror device according to claim 1, wherein the radius of curvature at the end portion of the worm shaft shaft has a smaller value than the radius of curvature at the worm shaft support portion formed on the holder, An electric retractable door mirror device characterized in that a center point of a radius of curvature is on an axis center line of the worm shaft.   An electric motor, a power transmission device composed of a worm mechanism, a gear mechanism, and the like serving to transmit power from the electric motor, a shaft fixed to the door side, and a relative rotational motion with respect to the shaft An electric storage comprising: a mirror housing to which a mirror is attached, and a holder housing an electric motor and a power transmission device for rotating the mirror housing and the mirror around the shaft. In the type door mirror device, both end portions of the worm shaft provided in a direction orthogonal to the rotation axis of the electric motor have a predetermined curvature radius and have a convex shape, and a holder And supporting both end portions of the worm shaft, and the thrust of the worm shaft The worm shaft support part that plays the role of receiving is made of a complex curved surface having a concave shape or a conical receiving surface, and is in line contact with the convex surface formed at the shaft end of the worm shaft. An electric retractable door mirror device characterized by that.

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