JPH0743842Y2 - Headlight irradiation angle adjustment device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel headlamp irradiation angle adjusting device. Specifically, it enables downsizing of the irradiation angle adjusting device of the headlight.

[0002]

2. Description of the Related Art Generally, a vehicle headlight, for example, a vehicle headlight is designed so that its irradiation angle can be adjusted, and a member for defining the irradiation angle, such as a headlight unit or a reflector. An irradiation angle adjusting device is provided for tiltably supporting a mirror or the like on a support member such as a vehicle body or a lamp body and for adjusting the irradiation angle by tilting the tilting member.

The irradiation angle is adjusted by a so-called initial aiming adjustment, that is, an adjustment and a leveling adjustment performed after the headlight is mounted on the vehicle body before use or at a regular or irregular inspection. , There is an adjustment to correct the deviation of the irradiation angle in the vertical direction caused by the change in the load applied to the vehicle body by people, loaded objects, etc.
Of these, the former initial aiming adjustment is usually made by an adjusting mechanism by manual operation, and the latter leveling adjustment is made by a drive unit driven by remote operation.

There are various types of adjusting devices for the above-mentioned leveling, but they are composed of an output part connected to a tilting member and a drive part including a motor, and the drive part is connected to a remote control part. In many cases, a control unit for controlling the rotation direction and rotation amount of the motor according to a command is provided.

FIG. 8 shows an example a of such an adjusting device for leveling, which is shown in Japanese Utility Model Laid-Open No. 2-13838.

Reference numeral b denotes a case, which is formed by joining case bodies c and d, which are divided into two in the front and rear.

Reference numeral e is an output gear in which a nut body f and a worm wheel g are integrally formed.

Reference numeral h denotes an adjusting shaft support, which is supported by the case b so as to be movable in the front-rear direction and non-rotatably, and has a thread i formed on its outer peripheral surface. The thread i is the output gear e. The nut body f is screwed to the adjusting shaft support h, and the adjusting shaft j is rotatably supported by the adjusting shaft support h.

Reference numeral k designates a DC motor supported in the case b. The rotation of the motor k is transmitted to the worm wheel g of the output gear e, and the output gear e rotates to adjust the adjustment shaft support h and the adjustment shaft. j is moved back and forth. Then, the tilting member connected to the tip of the adjusting shaft j is moved.

Reference numeral 1 denotes a control unit, which comprises a detection gear m and a printed contact portion (not shown) provided on the printed circuit board n, and the detection gear m is rotatably supported on the printed circuit board n by a shaft o and printed. By fixing the substrate n in the case b, it is rotatably arranged coaxially with the output gear e.

Reference numeral p denotes a counter gear, which has large and small gears, and is supported by a shaft q whose both ends are separately supported by the front and rear case bodies c and d, and the large gear is provided on the output gear e. The small gear of the counter gear p meshes with the gear r, and meshes with the detection gear m.

[0012]

In the above-mentioned conventional irradiation angle adjusting device a for the headlight, the warm wheel g is used.
Since the counter gear p that transmits the rotation of the counter gear to the detection gear m has its shaft outside the worm wheel g and the detection gear m that are coaxially arranged, a space for disposing the counter gear p in the case b. Is required, which is an obstacle to downsizing of the irradiation angle adjusting device of the headlight.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an irradiation angle adjusting device for a headlight according to the present invention is provided with a gear in a gear transmission mechanism coaxially and rotatably arranged separately. A plurality of counter gears are arranged between the detection gear and the pitch circle so that an inscribed circle and an circumscribed circle on the pitch circle are concentric circles centering on the axis of the one gear and the detection gear. A small gear whose pitch circle circumscribes the pitch circles of the plurality of counter gears, meshes the small gear with the counter gear, and the detection gear has the pitch circle of the plurality of counter gears. An internally toothed gear is provided so as to be inscribed, and the internally toothed gear is meshed with the counter gear.

[0014]

Therefore, in the headlamp irradiation angle adjusting device of the present invention, since the counter gear group can be arranged coaxially with one of the gears and the detection gear in the gear transmission mechanism, the counter gear group is provided outside the detection gear. It is not necessary to dispose a counter gear, and the irradiation angle adjusting device for the headlight can be made compact.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the irradiation angle adjusting device for a headlight according to the present invention will be described below with reference to the illustrated embodiments.

First, an outline of a headlamp device 1 using the headlamp irradiation angle adjusting device of the present invention will be described.

The headlight device 1 is of a so-called reflecting mirror movable type, and the irradiation axis is tilted by tilting the reflecting mirror.

Reference numeral 2 is a lamp body made of synthetic resin, and has a recess 3 which is open toward the front. A mounting groove 4 is formed at the front opening edge of the lamp body 2 and opens forward, and an insertion hole 5 is formed at the center of the rear part.

Reference numeral 6 denotes an arrangement concave portion for arranging a leveling driving portion, which will be described later, so that a portion of the right end portion of the lamp body 2 excluding an approximately one-quarter upper portion as viewed from the front is projected rearward. An insertion hole is formed at a position closer to the lower end of the arrangement recess 6, and a cylindrical portion 7 protruding forward and rearward from the edge of the insertion hole is integrally formed.

Reference numeral 8 denotes a lens made of transparent glass or synthetic resin, and its rear end portion is fitted and adhered in the installation groove 4 of the lamp body 2.

Reference numeral 9 denotes a reflecting mirror which is arranged in a space defined by the lamp body 2 and the lens 8 so as to be tiltable with respect to the lamp body 2.
0 is detachably attached.

Reference numeral 11 denotes a fulcrum shaft which is planted in the upper right portion of the recess 3 of the lamp body 2 so as to project forward. A spherical portion 11a is integrally formed at the front end of the fulcrum shaft 11. There is.

Reference numeral 12 denotes a ball receiving member supported on the upper right side of the rear surface of the reflecting mirror 9, which is made of synthetic resin and has a spherical receiving recess 12a which is open on the rear surface.

Thus, the spherical portion 11a of the fulcrum shaft 11 is
Is fitted into the receiving recess 12a of the ball receiver 12. As a result, the universal joint-shaped fulcrum portion 13 is formed.

Reference numeral 14 denotes an adjustment shaft, which is formed by integrally forming a crown gear 16 on the rear end of the screw shaft portion 15, and the portion near the rear end is rotatably supported on the upper left side of the lamp body 2. .

Reference numeral 17 denotes a nut body supported on the upper left side of the rear end portion of the reflecting mirror 9 so as to be tiltable within a certain range, and the screw shaft portion 15 of the adjusting shaft 14 is screwed into the nut body 17. There is.

Reference numeral 18 denotes an operating shaft rotatably supported on the rear surface of the lamp body 2, and a pinion gear 19 fixed to the lower end of the operating shaft is meshed with the crown gear 16. Reference numeral 20 denotes a head formed on the upper end of the operating shaft 18.
In this way, the first gap adjusting portion 21 is formed.

Then, by using an appropriate tool, for example, a screwdriver 22, the tip of the screwdriver is engaged with the head 20, and the operating shaft 1
When 8 is rotated, the rotation is transmitted to the adjustment shaft 14 via the pinion gear 19 and the crown gear 16. When the adjustment shaft 14 rotates, the screw shaft portion 15 is rotated according to the direction of the rotation.
Is screwed into or unscrewed from the nut body 17, and the nut body 17 is relatively moved in the front-rear direction along the screw shaft portion 15, whereby the portion of the reflecting mirror 9 supporting the nut body 17 is moved. The distance between the lamp and the rear wall of the lamp body 2 will be changed.

Reference numeral 23 denotes a leveling drive unit, which is arranged and fixed in the arrangement recess 6 of the lamp body 2.

Reference numeral 24 denotes a case of the leveling drive unit 23, which is formed by connecting a front case body 25a and a rear case body 25b, which are divided into front and rear halves, into a vertically long box shape.

Reference numeral 26 is a DC motor fixed to the upper part of the case 24 in a direction in which its axial direction extends to the left and right, and a pinion gear 27 is fixed to its rotary shaft 26a.

Reference numeral 28 denotes a gear body rotatably supported by the case 24 at a position immediately below the DC motor 26, and has a spur gear 28a at one end thereof and a worm 2 at the center thereof.
8b are integrally formed, and the spur gear 2
8a is meshed with the pinion gear 27.

Reference numeral 29 denotes a worm wheel rotatably supported in a substantially central portion of the case 24 with its axial direction extending in the front-rear direction, and is meshed with the worm 28b.

At the center of the front surface of the worm wheel 29, a short columnar supported portion 29a protruding forward is integrally formed, and at the center of the rear surface of the worm wheel 29, a small gear 29b is integrally formed. Has been done.

Reference numeral 30 denotes a cylindrical supporting portion formed on the inner surface of the front case body 25a at the substantially central portion thereof. The supported portion 29a of the worm wheel 29 is rotatably fitted therein, whereby the worm wheel 29 is provided. Is rotatably supported by the case 24.

Reference numeral 31 is a support, which is a cylindrical main portion 3
2 and a flange portion 33 protruding outward from the substantially central portion of the main portion 32 are integrally formed of synthetic resin.
On the outer peripheral surface of the rear portion from the flange portion 33 of the
Are formed. Then, on the outer peripheral surface of the flange portion 33, two detents 33a, which are appropriately spaced in the circumferential direction,
33a is projected.

A cylindrical portion 35 protruding forward is formed at a lower end portion of the front case body 25a, and a cylindrical portion 36 protruding rearward is also formed at a lower end portion of the rear case body 25b corresponding to the cylindrical portion 35. Are formed.

Front plate 3 closing the front end of the cylindrical portion 35
A circular insertion hole 37a is formed in the center of 7,
The diameter of the insertion hole 37a is slightly larger than the outer diameter of the front portion 32a (hereinafter referred to as "insertion portion") from the flange portion 33 of the main portion 32 of the support 31.

The cylindrical portion 35 is formed on the inner surface of the front case body 25a.
A cylindrical support wall 38 is provided so as to be continuous with the rear end of the support wall 38, and the rear end surface 38a of the support wall 38 is a curved surface with a middle protrusion.

Sliding grooves 39, 39 are formed on the inner surface of the cylindrical portion 35 and the inner surface of the support wall 38 so as to extend continuously in the front-rear direction and reach the rear end of the support wall 38.

The insertion portion 32a of the support 31 is inserted into the insertion hole 37a formed in the front plate 37 of the cylindrical portion 35 of the front case body 25a, and the detent protrusions 33a and 33a of the support 31 are formed. Sliding groove 3 of front case body 25a
9 and 39 are slidably engaged with the support 3
Reference numeral 1 is slidable in the front-rear direction with respect to the front case body 25a, but is rotatably supported.

On the inner surface of the rear case body 25b, a cylindrical supporting wall 40 is provided so as to be continuous with the front end of the cylindrical portion 36, and the front end surface 40a of the supporting wall 40 is formed into a curved surface with a middle protrusion. ing.

A partition wall 41 for dividing the continuous body of the cylindrical portion 36 and the support wall 40 into front and back is formed at a position on the front side of the continuous portion of the cylindrical portion 36 and the support wall 40, and the partition wall 41 has a central portion at the center thereof. An insertion hole 41a is formed.

Reference numeral 42 denotes an adjusting shaft, which is divided into three parts as a whole, and an intermediate cylindrical portion 42a, a front screw shaft portion 42b, and a rear prismatic portion 42c are integrally formed to form a rear end of the cylindrical portion 42a. A flange 43 having a small amount of protrusion is integrally provided on the inner surface of the columnar portion 42a, and an annular engaging groove 44 is formed at the front end of the columnar portion 42a.

The adjusting shaft 42 is inserted into the main portion 32 of the support 31 from the rear side, and the cylindrical portion 42a is rotatably supported by the main portion 32 of the support 31. Then, when the flange 43 of the adjustment shaft 42 comes into contact with the rear end surface of the main portion 32 of the support body 31, the engagement groove 44 forms the main portion 3 of the support body 31.
The stop washer 45 is engaged with the engaging groove 44 so as to prevent the adjusting shaft 42 from coming off the support 31.

Reference numeral 46 denotes an output gear, in which a cylindrical nut portion 47 and a disc portion 48 projecting from a position near the front end of the nut portion 47 are integrally formed of synthetic resin. The inner peripheral surface is provided with a spiral groove 47a, and the disk portion 48
Gear teeth 48a, 48a, ... Are formed on the outer peripheral surface of each of the nuts 47 and
The main groove 32 of the first main portion 32 is externally fitted to the rear portion of the flange portion 33, and its thread groove 47a is screwed with the thread 34 of the support 31. Further, the gear teeth 48a, 48a ,. Is meshed with the worm wheel 29. The prismatic portion 42c of the adjusting shaft 42 is inserted through the insertion hole 41a of the partition wall 41, and most of it is located inside the cylindrical portion 36.

Further, the rear end portion 38a of the support wall 38 of the front case body 25a is lightly contacted with or close to the front surface of the disc portion 48 of the output gear 46, and the support wall 40 of the rear case body 25b is provided. The front end surface 40a is a disk portion 48 of the output gear 46.
It is located in light contact with or in close proximity to the rear surface, which defines the position of the output gear 46 in the case 24 in the front-rear direction.

Therefore, the leveling drive unit 23 is arranged and fixed in the arrangement concave portion 6 of the lamp body 2, and the case 2
The rear end of the cylindrical portion 36 of No. 4 is positioned so as to fit into the front end of the cylindrical portion 7 of the disposing recess 6.

Reference numeral 49 denotes a nut body supported on the lower right side of the rear surface of the reflecting mirror 9 so as to be tiltable within a certain range, and the screw shaft portion 42b of the adjusting shaft 42 is screwed to the nut body 49.

When the motor 26 of the leveling drive unit 23 rotates, the rotational force is transmitted to the gear transmission mechanism in the order of the pinion gear 27, spur gear 28a, worm 28b, worm wheel 29, and output gear 46.
When the output gear 46 rotates, the support 31 that is screwed into the output gear 46 and is prevented from rotating is sent forward or backward depending on the direction of rotation of the output gear 46. Therefore,
The adjustment shaft 42 supported by the support 31 is the support 3
1 will be sent forward or backward, and the portion of the reflecting mirror 9 where the nut body 49 is supported will be moved forward or backward.

Reference numeral 50 is an aiming operation unit, and 51 is its case.

Reference numeral 52 denotes a connecting shaft, which is formed by fixing a crown gear 54 to the rear end of the connecting cylinder portion 53, and the connecting cylinder portion 53 is formed with a prismatic connecting hole 53a opened at the front end surface thereof. . The connecting shaft 52 is connected to the connecting tubular portion 53.
The rear end portion is rotatably supported by the case 51, and most of the connecting cylinder portion 53 projects forward from the front surface of the case 51.

Reference numeral 55 denotes an operation shaft rotatably supported in a state perpendicular to the case 51, and a pinion gear 56 fixed to the lower end of the operation shaft is meshed with the crown gear 54 of the connecting shaft 52. The head 57 formed on the upper end of the operation shaft 55 projects from the upper surface of the case 51. Then, when the operation shaft 55 is rotated by using an appropriate tool, for example, the driver 22, the rotation is changed.
6, transmitted to the connecting shaft 52 via the crown gear 54.

The aiming operation part 50 constructed as described above is fixed to the lower right part of the rear surface of the lamp body 2, and the connecting cylinder part 53 of the connecting shaft 52 is inserted into the cylinder part 7 of the lamp body 2. The prismatic portion 42c of the adjusting shaft 42 is slidably but non-rotatably inserted into the connecting hole 53a. In this way, the second gap adjusting section 58 is configured.

Therefore, when the operating shaft 55 is rotated to rotate the connecting shaft 52 as described above, the adjusting shaft 42 connected to the connecting cylindrical portion 53 is rotated, and its screw is rotated according to the direction of the rotation. The shaft portion 42b is screwed into or unscrewed from the nut body 49, so that the nut body 49 is relatively screwed.
It is moved in the front-back direction along b, so that the distance between the portion of the reflecting mirror 9 supporting the nut body 49 and the rear wall of the lamp body 2 is changed.

Reference numeral 59 is a control unit for controlling the amount of movement of the adjustment shaft 42, which comprises a printed circuit board and a detection gear.

The printed circuit board 60 is fixed to the inner surface of the rear case body 25b, and the required printed conductors 61, 61, ... Are formed on the front surface thereof.

A mounting hole 62 is formed at a position near the lower end of the printed circuit board 60.

Reference numeral 63 is a detection gear, which is made of synthetic resin.

Reference numeral 64 denotes a disc-shaped main portion of the detection gear 63, a supported hole 65 is formed in the center thereof, and a relatively large circular concave portion 66 is formed in the rear surface thereof. The contacts 67, 67 are attached. The contacts 67, 67 and the printed conductor 61 on the printed circuit board 60,
The details of 61, ... Are shown in the above-mentioned Japanese Utility Model Laid-Open No. 13838/1990, so the description thereof will be omitted.

On the front surface of the main portion 64, a circular wall 68 extending along the outer peripheral edge thereof is projected, and gear teeth are formed on the inner peripheral surface of the wall 68 to form an internal gear 69. .

Reference numeral 70 denotes a shaft body, which is made of aluminum.

The shaft body 70 has a disk-shaped support shaft whose outer diameter is the same as or slightly smaller than the inner diameter of the supported hole 65 of the detection gear 63, and whose thickness is the same as or slightly larger than the thickness of the main portion 4 of the detection gear 63. The portion 70a, a mounting portion 70b protruding from the center of the rear surface of the support shaft portion 70a, and a column portion 70c protruding from the center of the front surface of the support shaft portion 70a are integrally formed.

The shaft body 70 has its mounting portion 70b inserted from the front side into the mounting hole 62 of the printed circuit board 60, and is fixed to the printed circuit board 60 by caulking a portion protruding to the rear surface side of the printed circuit board 60. .

The detection gear 63 is rotatably supported by the shaft body 70 by inserting the support shaft portion 70a of the shaft body 70 into the supported hole 65 of the main portion 64 of the detection gear 63.

Reference numeral 71 denotes a disk-shaped holder, the center of which is fixed to the front end of the column 70c of the shaft body 70.

Reference numerals 72, 72 and 72 are counter gears, and large gears 72b are provided at both front and rear ends of the connecting shaft 72a.
And a small gear 72c are separately fixed.

The counter gears 72, 72,
Numeral 72 is rotatably supported at a portion near the periphery of the holder 71 at equal intervals in the circumferential direction.

The three counter gears 72, 7
A circle circumscribing the pitch circles of the 2, 72 large gears 72b, 72b, 72b and the small gear 29b of the worm wheel 29.
3 counter gears 72, 7
The circle in which the pitch circles of the small gears 72c, 72c and 72c of 2, 72 are inscribed coincides with the pitch circle of the internal gear 69 of the detection gear 63.

As a result, the small gear 29b of the worm wheel 29 is located in a position surrounded by the large gears 72b, 72b, 72b of the three counter gears 72, 72, 72, and these gears 72b, 72b, 72b are The small gears 7 of the counter gears 72, 72, 72 that mesh with each other
2c, 72c, and 72c are located in the internal gear 69 of the detection gear 63 and mesh with the internal gear 69.

Therefore, the rotation of the worm wheel 29 is detected by the detection gear 63 via the counter gears 72, 72, 72.
And the position of the adjusting shaft 42 is detected.

The embodiment described above is an application of the present invention to a reflector-movable headlight device, but the present invention can also be applied to a so-called unit-movable headlight device. . A movable unit type headlamp device is a headlamp unit in which a lens is attached to a reflecting mirror that supports a light source so as to cover the front surface of the reflector, and is tiltably supported by a lamp housing that is supported by a vehicle body. It is a type of headlight device. When the present invention is applied to a unit movable type headlight device, the headlight unit serves as a tilting member.

[0073]

As is apparent from the above description, the irradiation angle adjusting device for a headlight according to the present invention rotates with an adjusting shaft connected to a tilting member for changing the irradiation angle by tilting. And an output gear for moving the adjustment shaft in the axial direction, a gear transmission mechanism for linking the motor and the output gear, and a detection gear for transmitting rotation of one gear in the gear transmission mechanism, One gear and the detection gear are coaxially and rotatably arranged separately, a support is fixedly arranged between the one gear and the detection gear, and a plurality of counter gears are provided on the support. Are arranged so that the circle inscribed in the pitch circle of the counter gear and the circle inscribed in the circumscribed circle are concentric circles centering on the axis of the gear and the detection gear, and the pitch circle is arranged on the gear of the counter Circumscribes with the gear pitch circle A small gear is provided to mesh the small gear with the counter gear, and the detection gear is provided with an internal gear whose pitch circle is inscribed in the pitch circles of the plurality of counter gears. It is characterized by meshing with.

Therefore, in the headlamp irradiation angle adjusting device of the present invention, the counter gear group can be arranged coaxially with one gear and the detection gear in the gear transmission mechanism.
Since it is not necessary to dispose the counter gear outside the detection gear, the irradiation angle adjusting device for the headlamp can be made compact.

The specific shapes and structures shown in the above embodiments are merely examples of the implementation of the present invention, and the technical scope of the present invention is limited by these. It is not intended to be interpreted.

[Brief description of drawings]

FIG. 1 is an enlarged exploded perspective view showing a main part of an irradiation angle adjusting device for a headlight according to the present invention.

FIG. 2 is a horizontal cross-sectional view of a headlight device using the headlamp irradiation angle adjusting device of the present invention.

3 is an enlarged cross-sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.

FIG. 5 is a partially cutaway enlarged front view of a main part.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a diagram showing a part of FIG. 6 in an enlarged manner.

FIG. 8 is an exploded perspective view of essential parts showing an example of a conventional irradiation angle adjusting device for a headlight.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Headlight 9 Tilt member 23 Headlight irradiation angle adjusting device 26 Motor 29 One gear of a gear transmission mechanism 29b Small gear 42 Adjustment shaft 46 Output gear 63 Detection gear 69 Internal gear 71 Support body 72 Counter gear

Claims (1)

[Scope of utility model registration request] 1. An adjusting shaft connected to a tilting member for changing an irradiation angle by tilting, an output gear for rotating the adjusting shaft in an axial direction, and a motor and an output gear for linking each other. A gear transmission mechanism; and a detection gear that transmits rotation of one gear in the gear transmission mechanism. The one gear and the detection gear are coaxially and rotatably arranged separately from each other. And a detection gear, a support is fixedly arranged between the detection gear and a plurality of counter gears, and a circle inscribed in the pitch circles of the plurality of counter gears and a circle circumscribing the one are the one gear and the detection gear. Are arranged so as to be concentric circles centering on the axis of, and a small gear whose pitch circle is circumscribed with the pitch circles of the plurality of counter gears is provided in the one gear to mesh the small gear with the counter gear. ,
An irradiation angle adjustment of a headlamp, characterized in that the detection gear is provided with an internal gear whose pitch circle is inscribed in the pitch circles of the plurality of counter gears, and the internal gear is meshed with the counter gear. apparatus.