JP2002067799A - Helical gear structure of vehicular mirror driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a helical gear structure of a vehicular mirror driving device capable of reducing rotational resistance of a helical gear. SOLUTION: Since a level difference part 28 for holding a lubricant is formed on a tip surface of a guide cylinder 26, a surface of the guide cylinder 26 being originally a mutually contacting part in the large area and an outer cylinder 33 of the helical gear 35 become a state of interposing the lubricant R between both so that the rotational resistance between both is remarkably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical gear structure of a vehicle mirror drive device capable of reducing the rotational resistance of a helical gear.

[0002]

2. Description of the Related Art For a vehicle, for example, an electric door mirror for an automobile, a spherical tip portion of a rod projecting from a housing is fitted into a spherical socket portion of a holder base whose center portion is tiltably supported on a pivot shaft of the housing. By doing so, the angle of the mirror fixed to the holder base is changed.
00-118304).

A rod of this type is inserted into a helical gear provided inside a housing, and an outward claw formed at a base end of the rod is screwed into an internal screw formed on an inner surface of the helical gear. By rotating the helical gear by a motor, the rod is made to protrude and retract from the opening of the housing. In order to ensure relative rotation of the rod with respect to the helical gear, a projection is formed at the spherical tip of the rod, and the projection is engaged with a groove formed on the inner surface of the spherical socket to prevent rotation of the rod. ing.

[0004]

However, such a movement that the rod does not rotate but only moves in and out as in the prior art has a large friction coefficient between the rod and the packing. If the packing comes into close contact with the inner surface of the packing without using it, the initial load when the rod extends and retracts is large, and a large force is applied to the claw part of the rod and a part of the helical gear, which may damage that part. is there.

[0005] Therefore, there is a need for a structure in which the rod is moved out and in while rotating together with the helical gear. In particular, a proposal has been awaited for a helical gear structure of a vehicle mirror drive device that can reduce the rotational resistance of a helical gear, which is a component larger than a rod.

The present invention has been made by paying attention to such a conventional technique, and provides a helical gear structure of a vehicle mirror drive device capable of reducing the rotational resistance of the helical gear.

[0007]

According to the first aspect of the present invention,
A housing is formed by the housing main body and the housing lid, and a bearing formed at the center of a holder base to which the mirror is fixed is tiltably fitted to and supported by a pivot shaft formed at the center of the housing lid. Is provided at a position different from that of the pivot shaft, and the spherical tip of the rod is rotatably and tiltably fitted to the spherical socket of the holder base, and has an internal screw on the inner surface on the bottom surface of the housing body. Form a cylindrical guide tube,
A bottomed inner cylinder having a plurality of slits formed in the helical gear on the side surface is inserted into the guide cylinder, and a rod is inserted into the inner cylinder of the helical gear, and the outer cylinder formed at the base end of the rod is inserted. The protruding claw part is projected outward from the slit of the inner cylinder and screwed into the inner screw of the guide cylinder, and the helical gear is rotated in the forward and reverse directions to rotate and protrude and retract the rod. A helical gear structure of a mirror drive device for a vehicle, wherein an outer cylinder having an inner diameter corresponding to the outer diameter of the guide cylinder is formed from a front end of the inner cylinder of the helical gear via a folded portion, and the guide cylinder A step portion for holding the lubricant was formed on the tip surface of the.

According to the first aspect of the present invention, since the stepped portion for holding the lubricant is formed on the distal end surface of the guide cylinder, the helical gear and the surface of the guide cylinder which are originally in contact with each other in a large area. Is in a state where a lubricant is interposed therebetween, so that the rotational resistance between the two is significantly reduced.

According to a second aspect of the present invention, a gap is provided between the bottom surface of the inner cylinder of the helical gear and the bottom surface of the guide cylinder, and the folded portion of the helical gear is rotatably supported by the distal end surface of the guide cylinder. .

According to the second aspect of the present invention, since the folded portion of the helical gear is rotatably supported by the distal end surface of the guide cylinder, the contact area between the helical gear and the guide cylinder is reduced, and the helical gear is correspondingly reduced. , The rotational resistance becomes smaller.

According to a third aspect of the present invention, a shaft pin is formed on the bottom of the guide cylinder, and a shaft hole for inserting the shaft pin is formed on the bottom of the inner cylinder of the helical gear.

According to the third aspect of the present invention, the shaft pin formed on the bottom surface of the guide cylinder is fixed to the helical gear while the bottom surface of the guide cylinder and the bottom surface of the inner cylinder of the helical gear are not in contact with each other. Since the helical gear is inserted into the shaft hole formed in the bottom surface of the inner cylinder, the rotation shaft of the helical gear can be extended, and the contact area between the shaft pin and the shaft hole can be small, so that the rotation resistance of the helical gear is further reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

For a vehicle, for example, a mirror driving device mounted on an automobile includes a door mirror, a fender mirror, a room mirror, and the like. In this embodiment, a case of a door mirror mounted on a right door will be described as an example. I do.

FIGS. 1 and 2 are a rear view and a sectional view, respectively, showing a driving device for a door mirror, and FIGS. 3 and 4 are exploded perspective views thereof. First, the basic structure and performance of the driving device will be described with reference to FIGS.

Basic Structure and Performance (FIGS. 1 to 4) A housing 3 is composed of a housing body 1 and a housing lid 2.
Are formed. The housing 3 is substantially hermetically sealed, and contains driving mechanism components such as a motor 4 and a helical gear 5 therein. At the center of the surface of the housing lid 2, a pivot shaft 6 having a spherical tip is erected, and a bearing 8 formed at the center of a holder base 7 is rotatably fitted to the tip of the pivot shaft 6. A mirror 9 (FIG. 2) is attached to the holder base 7, and the mirror 9 together with the mirror 9 is provided.
Can be tilted in any direction about the pivot shaft 6.

Openings 10 are formed in the housing lid 2 at positions directly beside and directly below the pivot shaft 6, respectively. From these openings 10, rods 11
Is protruding. The rods 11 can be moved up and down independently of each other, and their spherical tip portions 12 are rotatably fitted into spherical socket portions 13 formed at corresponding positions of the holder base 7.

Therefore, the angle of the holder base 7 (mirror 9) can be changed in the vertical direction by extending and retracting the rod 11 immediately below, and the holder base 7 (mirror 9) can be changed by extending and retracting the rod 11 directly beneath. ) Can be changed in the left-right direction. Accordingly, the driver can optimally adjust the angle of the mirror 9 according to his / her height and gaze direction.

Next, the structure and operation of a characteristic portion of the driving device will be described.

The retracting structure of the rod 11 (FIGS. 2 to 5, 8
15) Two guide cylinders 26 each having an inner screw 25 formed on the inner surface thereof are formed at a position corresponding to the opening 10 on the bottom surface 24 of the housing body 1. A shaft pin 27 is formed at the center of the bottom surface of the guide cylinder 26. Further, a step portion 28 (FIG. 10) formed one step thinner is formed on the side surface of a portion corresponding to the tip of the guide cylinder 26, and the lubricant R is injected therein.

The proximal end of the guide tube 26 is
Is located outside the general surface of the bottom portion 24 of the housing body 1 in order to make
The bottom surface portion 24 is connected to the base end of the guide tube 26 in a state of being recessed outward. That is, the bottom portion 24 is not connected to the side surface of the guide tube 26 in a state of being abutted,
It is connected to the base end of the guide tube 26 in a state of being bent outward. Therefore, when the housing body 1 is integrally formed of resin, nothing is connected to the side surface of the guide cylinder 26, so that the internal screw 25 does not have sink marks on the resin molding, and the internal screw 25 is in a complete state. can get.

2 at the bottom 24 of the housing body 1
Two motors 4 are fixed in the same direction between the two guide cylinders 26. The motors 4 each have a worm gear 29 that is rotatable in forward and reverse directions. The worm gear 29 is engaged with an external screw 30 of the helical gear 5 described later.

Since the two motors 4 are arranged in the space between the guide cylinders 26 in the housing body 1 in the same direction as described above, the portion which is originally a dead space between the guide cylinders 26 is used as a space for arranging the motors 4. The guide tube 2 is provided inside the housing 3 because it can be used effectively.
6, the size and thickness of the housing 3 can be reduced.

By adopting such an arrangement structure of the motor 4, the shape of the housing 3 is changed to the two guide cylinders 2.
6 can be formed in a substantially triangular shape with the widest width, and a drive device having one structure can be used as both left and right door mirrors.

The helical gear 5 is inserted into the guide cylinder 26 from above. The helical gear 5 has an inner cylinder 3 having a bottom.
The outer cylinder 33 has a shape formed by forming an outer cylinder 33 from the front end of the outer cylinder 33 via a folded portion 32, and the outer surface of the outer cylinder 33
0 is formed. The outer screw 30 is engaged with the worm gear 29 of the two motors 4 as described above. The inner diameter of the outer cylinder 33 corresponds to the outer diameter of the guide cylinder 26, and the helical gear 5 does not rattle in the guide cylinder 26. The outer diameter of the inner cylinder 31 is smaller than the inner diameter of the guide cylinder 26, and the inner cylinder 31 does not contact the inner screw 25 of the guide cylinder 26.

On the side surface of the inner cylinder 31, four slits 24 are formed along the longitudinal direction. On the inner surface of the inner cylinder 31 between the slits 34, a rib 35 having a predetermined length from the bottom surface is provided.
(FIG. 9) are respectively formed. A shaft hole 36 through which the shaft pin 27 is inserted is formed at the bottom of the inner cylinder 31. The bottom of the inner cylinder 31 and the bottom of the guide cylinder 26 do not contact each other. The helical gear 5 itself has its folded portion 32
Are supported by the distal end surface of the guide cylinder 26. In addition, the shaft pin 27 and the shaft hole 36 are in contact with each other in order to project the rotation axis of the helical gear 5. Helical gear 5 and guide cylinder 2
Since the contact area with the motor 6 is small, the rotational resistance is small, the output loss of the motor 4 is small, and no friction noise is generated when the motor 4 rotates. Further, the step portion 28 is formed at the tip of the guide cylinder 26, and the lubricant R is injected into the step portion 28, which also contributes to the reduction of the rotational resistance of the helical gear 5. That is, since the lubricant R is interposed between the surface of the guide cylinder 26 and the outer cylinder 33 of the helical gear 5, which are parts that come into contact with each other in a large area, the rotational resistance between the two is significantly reduced. .

The rod 11 is inserted into the helical gear 5. The portion of the rod 11 other than the spherical distal end portion 12 has a cylindrical shape, and the base end portion 37 has four slits 38 formed therein. This slit 3
A rib 35 formed on the inner surface of the helical gear 5 is inserted into 8, and the slit 38 is formed shorter than the rib 35. Therefore, the end of the slit 38 is placed on the end of the rib 35, and a slight gap S1 (FIG. 8) is secured between the base end 37 of the rod 11 and the bottom surface of the helical gear 5. And they do not touch each other.

A slight gap S2 (FIG. 8) is also provided between the side surface of the rod 11 and the inner surface of the helical gear 5, and they do not contact each other. The distal end side of the rod 11 projects from the opening 10 through a ring-shaped rubber packing 39, and the watertightness of the opening 10 is maintained. Then, the side surface of the rod 11 slides on the inner surface of the packing 39, so that the posture of the rod 11 is maintained.

Four claws 40 are formed outwardly between the slits 38 at the base end 37 of the rod 11. The tip of the claw portion 40 is formed slightly obliquely corresponding to the inner screw 25 of the guide cylinder 26. A spring 41 for urging the four claw portions 40 outward is fitted inside the rod 11. Base end 3 of rod 11
7 has a crank shape having a portion 42 bent outward, and a claw portion 40 is formed thereon. The base end 37 of the crank shape is located between the slits 34 of the helical gear 5, and only the claw portion 40 projects outside the side surface of the helical gear 5. Accordingly, since the base end 37 of the rod 11 engages with the portion other than the slit 34 of the helical gear 5 in the rotation direction, when the helical gear 5 is rotated, the rod 11 also rotates inside thereof. Claw portion 4 of rod 11
By rotating the helical gear 5 in the forward and reverse directions, the rod 1
1 moves in the direction of emergence within the guide cylinder 26 while rotating.

The base end 3 of the rod 11 having the claw 40 formed thereon
7 has a crank shape having an outwardly bent portion 42 (FIG. 12).
Thereby, the claw portion 40 is easily bent up and down. Claw part 4
In order to minimize the generation of a different load on the rod 11, the claw portion 40 of the rod 11 is connected to the guide cylinder 26 as described above.
Although the rod 11 is formed obliquely in correspondence with the inner screw 25, the tip end side of the rod 11 is pressed by the packing 39 and does not tilt, so that the claw 40 is rotated along the inner screw 25 of the guide cylinder 26. If a slightly different load is applied to each of the claws 40 in the protruding / retracting direction, the load is directly applied to the claws 40. However, even if a load is applied to the claw portion 40 in this manner, the load can be absorbed by bending the outwardly bent portion 42, so that deformation and breakage of the claw portion 40 can be prevented. In addition, a portion of the base end 37 of the rod 11 other than the outwardly bent portion 42 along the emergence direction has a function of securing a large contact surface in the rotation direction with the helical gear 5. Can be reliably transmitted to the rod 11.

According to this structure, since the rod 11 moves in the retracting direction while rotating, the rod 11 and the packing 3 can be moved in comparison with the case where the rod 11 simply retracts without rotating.
The friction between the rod 11 and the rod 11 is reduced, and the rod 11 is smoothly moved in and out.

When the spherical tip 12 of the rod 11 slides on the inner surface of the spherical socket 13 of the holder base 7, the maximum diameter portion of the side surface of the spherical tip 12 centered on the rotation axis is also required. Since the chamfered portion 43 (FIG. 14) having a predetermined width is formed, a portion of the surface of the spherical tip portion 12 that rubs the most with the spherical socket portion 13 is cut off.
The sliding resistance of the spherical tip 12 is reduced. This chamfer 4
3 is preferably linear in cross section, and if it is depressed from the linear shape, a sharp edge is formed at the boundary with the spherical surface, and depending on the degree, it will hinder the tilting of the spherical tip 12. However, there is no problem even if the chamfered portion 43 is slightly recessed. Since a space is formed between the chamfered portion 43 and the inner surface of the spherical socket portion 13, if the lubricant R is injected into the space, the lubricant R can be held there. As a result, the sliding resistance of the spherical tip 12 is further reduced.

As a conventional structure, there is also a structure in which an inner screw is formed on the inner surface of the helical gear 5 without providing the guide cylinder 26, and the claw portion 40 of the rod 11 is engaged with the inner screw. In that case, in order to ensure relative rotation with the inner screw, a projection is formed on the spherical tip portion 12 of the rod 11 and the projection is engaged with a groove formed on the inner surface of the spherical socket portion 13. Eleven rotations had to be prevented. In such a conventional structure, the rotation of the rod 11 is prevented by the projection formed on the spherical tip portion 12 of the small rod 11, so that the projection is easily damaged and the operation reliability of the rod 11 is poor. However, according to the structure of this embodiment, since the rod 11 itself is rotated, there is no factor that hinders the protruding and retracting performance of the rod 11, and the operation reliability is high. Further, since it is not necessary to form a small projection on the spherical tip portion 12 of the rod 11, the manufacture of the rod 11 itself is easy, and the handling of the rod 11 as a part is also easy.

When the rod 11 moves to the limit position on both sides in the protruding and retracting direction, the portions other than the slit 37 of the rod 11
The claw portion 40 is deflected inward against the spring 41, and idles with respect to the inner screw 25. Therefore, even if the motor 4 rotates, further movement of the rod 11 is prevented. In this way, the claw portion 40 idles by bending inward,
The claw portion 40 is not deformed or damaged, and the idling sound can be reduced. In particular, in this embodiment, when the rod 11 moves to the limit position in the immersion direction, the rod 11
Of the slit 38 of the helical gear 5 comes into contact with the upper part of the inward rib 35 formed inside the inner cylinder 31 of the helical gear 5,
Further movement is restricted, and idle rotation there. However, as described above, the length of the slit 38 is shorter, and there is a slight gap between the bottom of the rod 11 and the bottom of the helical gear 5. Since the gap S1 (FIG. 8) is secured and the two do not come into contact with each other, the rod 11
The bottom of the rod 11 does not hit the bottom of the helical gear 5 even if it runs idle at a position close to the bottom of the helical gear 5. Therefore, rod 1
1 can reduce the rotational resistance during idling and also reduce idling noise.

Next, although not a feature of the present invention, the structure of each part of the drive device will be described to help understanding of the structure and performance of the drive device itself.

The structure of the holder base 7 (FIGS. 1 to 3, FIG.
6, FIG. 7) The holder base 7 has a ring body 44 having a side surface facing the bearing portion 8 around a bearing portion 8 formed on the housing lid 2 for receiving the pivot shaft 6. On each side of the ring body 44, an extension 45 is formed by further extending the side surface of the ring body 44 toward the housing lid 2, and an opening 46 is formed in that portion, and a flange 47 is formed around the opening 46. Have been.

In the middle of the opening 46, the rod 11
At a position corresponding to the spherical socket portion 13 into which
An elastic portion 48 having a substantially V-shaped cross section and a predetermined height is integrally formed with a pair of elastic pieces. The elastic portion 48 can elastically deform the pair of elastic pieces in the lateral direction. Separate openings 49 are provided on both sides of the elastic portion 48, respectively.
Are formed.

The central bearing portion 8 of the holder base 7 has a spherical inner surface corresponding to the pivot shaft 6, and its root portion is opened with a diameter smaller than the maximum diameter of the pivot shaft 6. Four slits 50 (FIG. 3) are formed vertically at the root of the bearing portion 8 so that the root of the bearing portion 8 can be forcibly expanded. Further, four claw portions 55 are formed around the bearing portion 8 in an upward state.

On the other hand, on the surface of the housing lid 2, four sets of a pair of position regulating bodies 51 are formed at predetermined intervals on four sides of the pivot shaft 6. Then, after press-fitting the bearing portion 8 of the holder base 7 to the pivot shaft 6, the pair of position regulating bodies 51 are connected to the openings 49 on both sides of the corresponding elastic portion 48.
Insert into. Then, the elastic portion 48 having a substantially V-shaped cross section is obtained.
However, each of the holder bases 7 is positioned between the pair of position restricting bodies 51, so that the holder base 7 can move in the rotation direction about the pivot shaft 6, and the holder base 7 can only tilt about the pivot shaft 6. Become.

After the elastic portion 48 is positioned between the position regulating members 51, two leaf springs 52 are attached to the bearing portion 8 so as to cross each other. Each of the leaf springs 52 is formed with a circular hole 53 having an inner diameter corresponding to the outer diameter of the root of the bearing portion 8. The circular hole 53 is attached to the bearing portion 8 from above. By passing the circular hole 53 of the leaf spring 52 through the bearing 8, the expansion of the root of the bearing 8 is restricted, and the pivot shaft 6 fitted in the bearing 8 is prevented from coming off the bearing 8. In addition, the leaf spring 52 itself also engages with the claw portion 55 formed around the bearing portion 8, thereby preventing the leaf spring 52 from coming off from the bearing portion 8. Although two leaf springs are used in a cross shape, a cross shape may be prepared in advance.

Both sides of the leaf spring 52 are bent in a mountain shape so as to get over a flange 47 surrounding the opening 46, and return portions 54 are formed at both ends thereof so as to elastically contact the extended portion 45 of the ring body 44. . Therefore, since the ring body 44 is always pressed in the radial direction by the return portion 54 of the leaf spring 52, the tension of the leaf spring 52 acts on the entire holder base 7 to prevent the holder base 7 from vibrating.
Therefore, the mirror 9 fixed to the holder base 7 does not vibrate, and the visibility of the mirror 9 is improved.

When each of the rods 11 is extended and retracted, and the holder base 7 is tilted about the pivot shaft 6 in a vertical or horizontal direction like a “seesaw”, the two elastic portions 48 facing each other One of the elastic portions 48 entirely enters the position regulating body 51 deeply, and the other has a state in which only a part thereof enters the position regulating body 51 shallowly. Position regulating body 51
As described above, since the pair of elastic pieces of the elastic part 48 resiliently contact the position restricting body 51, the elastic part 48 that is deeply inserted between the elastic parts 48 in the rotation direction about the pivot shaft 6 of the holder base 7 as described above. Rattling is prevented, and also in this respect, the visibility of the mirror 9 fixed to the holder base 7 is improved.
As shown in FIG. 7, the elastic portion 48 on the opposite side to the one deeply inserted between the position restricting bodies 51 does not completely come out from between the position restricting bodies 51, but a part thereof is in Because of the overlap, when the holder base 7 is tilted to the opposite side, the elastic portion 48 can be reliably guided between the position regulating bodies 51.

The waterproof / drainage structure of the housing 3 (see FIGS.
5, FIG. 16) The outer edges of the housing main body 1 and the housing lid 2 are double-walled outer waterproof walls 14 and 15 and the inner waterproof wall 1 respectively.
6, 17 are formed facing each other. Then, with the housing body 1 and the housing lid 2 assembled, the outer waterproof walls 14 and 15 and the inner waterproof walls 16 and
The side surfaces of 7 are in close contact with each other. This close contact state is maintained by the engagement of the three hooks 18 formed on the housing body 1 with the projections 19 formed on the housing lid 2.

The outer waterproof walls 14 and 15 and the inner waterproof wall 1
By bringing 6 and 17 into close contact with each other, a drain passage 20 substantially along the peripheral edge of the housing 3 is formed therebetween. Then, in the housing main body 1 in the drain passage 20, the drain hole 2 is located at a position which is a lower end portion in a state of being attached to the vehicle body.
1 is formed. The angle from the pivot shaft 6 is 9
Another drain hole 21 is formed at a position different from 0 °. The other drain hole 21 is used when the housing body 1 is used as a left side door mirror.

Outside the drain hole 21, a box-shaped compartment 22 extending horizontally to the left from the drain hole 21 is formed. A drain hole 23 is formed on the bottom wall of the compartment 22 facing the drain hole 21 at a position offset to the left with respect to the drain hole 21.

According to this waterproof / drainage structure, since the double-walled drainage flow path 20 is formed, it is unlikely that high-pressure car wash water intrudes from the joint between the outer waterproof walls 14 and 15. Even in this case, since the inside waterproof walls 16 and 17 are provided inside the housing, the housing does not enter the center of the housing body 1.
The intruded water passes through the drain passage 20 and is guided to the drain hole 21 at the lower end, and from the drain hole 21 to the drain hole 23 of the compartment 22.
Is drained to the outside. The drain hole 21 and the drain hole 2
Because of the communication, the respiratory action caused by the expansion and contraction of the air in the housing 3 due to the temperature change can be secured.

For the water that travels along the surface of the housing body 1 and tries to enter the inside of the housing 3 from the drain hole 23, the side wall of the compartment 22 surrounds the periphery of the drain hole 21. The side wall serves as a protective wall against water that tends to enter the drain hole 21, and the waterproof performance is improved. A drain hole 23 formed in the bottom wall of the compartment 22 is provided.
Is offset with respect to the drain hole 21, so that even if water intrudes straight from the drain hole 23, the water hits a portion other than the drain hole 21 and returns to its original position, thereby preventing the water from entering the housing 3. In addition, the waterproof performance is further improved.

In the structure of this embodiment, the drain holes 2
3 is offset from the drain hole 21 in the direction (horizontal direction) along the peripheral edge of the housing main body 1, so that the direction of the compartment 22 can also be formed in a horizontally long state along the peripheral edge of the housing main body 1. , To form the compartment 22
It is not necessary to increase the size of the housing main body 1, and the housing 3 can be made more compact.

[0049]

According to the present invention, the stepped portion for holding the lubricant is formed on the front end surface of the guide cylinder, so that the surface of the guide cylinder, which is a portion that is originally in contact with a large area, is outside the helical gear. Since the cylinder is in a state in which the lubricant is interposed therebetween, the rotational resistance between the two is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a rear view showing a driving device according to the present invention.

FIG. 2 is a sectional view taken along the line SA-SA shown in FIG.

FIG. 3 is an exploded perspective view showing a housing lid, a holder base, and a leaf spring of FIG. 1;

FIG. 4 is an exploded perspective view showing the housing main body of FIG. 1 and a driving component to be built therein.

FIG. 5 is an enlarged cross-sectional view showing the rod retracting structure of FIG. 2;

FIG. 6 is an enlarged sectional view showing the holder base of FIG. 2;

FIG. 7 is an enlarged cross-sectional view showing a state in which an elastic portion moves between the position regulating bodies of FIG. 1;

FIG. 8 is an enlarged sectional view showing the guide cylinder of FIG. 5;

FIG. 9 is an enlarged sectional view showing the helical gear of FIG. 2;

FIG. 10 is an enlarged sectional view showing a portion indicated by an arrow DA in FIG. 8;

FIG. 11 is an overall side view showing the rod of FIG. 5;

FIG. 12 is an overall sectional view showing the rod of FIG. 11;

FIG. 13 is an enlarged sectional view showing the spherical socket portion of FIG. 2;

FIG. 14 is an enlarged sectional view showing a chamfered portion of the spherical tip portion in FIG. 6;

FIG. 15 is a sectional view taken along the line SB-SB shown in FIG. 5;

FIG. 16 is an enlarged cross-sectional view showing a portion indicated by an arrow DB in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing main body 2 Housing lid 3 Housing 5 Helical gear 6 Pivot shaft 7 Holder base 8 Bearing part 9 Mirror 11 Rod 12 Spherical tip part 13 Spherical socket part 24 Bottom part 25 Internal screw 26 Guide cylinder 27 Axis pin 28 Step part 31 Inner cylinder 32 Folded part 33 Outer cylinder 34 Slit (helical gear) 36 Shaft hole 37 Base end (rod) 40 Claw part 42 Outside bent part S1, S2 Gap R Lubricant

Claims (3)

[Claims] A housing is formed by a housing main body and a housing lid, and a bearing formed at the center of a holder base to which a mirror is fixed is fitted to a pivot shaft formed at the center of the housing lid so as to be tiltable. A rod that is retractable at a position different from the pivot axis of the housing, and the spherical tip of the rod is rotatably and tiltably fitted to the spherical socket of the holder base; Form a cylindrical guide cylinder having an internal thread in, insert a bottomed inner cylinder having a plurality of slits formed in the helical gear on the side surface in the guide cylinder,
A rod is inserted into the inner cylinder of the helical gear, and an outward claw formed at a base end of the rod is projected outward from a slit of the inner cylinder to be screwed into an inner screw of the guide cylinder, and a helical gear is formed. A helical gear structure of a vehicle mirror drive device for changing a rod angle by rotating a rod by rotating a gear in forward and reverse directions to change an angle of a holder base. Forming an outer cylinder having an inner diameter corresponding to the outer diameter of the guide cylinder via
A helical gear structure for a mirror drive device for a vehicle, wherein a step portion for holding a lubricant is formed on a front end surface of the guide cylinder. 2. The helical gear structure of a vehicle mirror drive device according to claim 1, wherein a gap is provided between the bottom surface of the inner cylinder of the helical gear and the bottom surface of the guide cylinder, and the helical gear is turned back. A helical gear structure for a vehicle mirror drive device, wherein the helical gear is rotatably supported by a distal end surface of a guide cylinder. 3. The helical gear structure for a vehicle mirror drive device according to claim 2, wherein a shaft pin is formed on a bottom surface of the guide cylinder, and the shaft pin is inserted into a bottom surface of the inner cylinder of the helical gear. A helical gear structure for a vehicle mirror drive device, wherein a shaft hole is formed.