JP2517487B2 - Headlight irradiation angle adjustment device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel headlamp irradiation angle adjusting device, and more particularly, to improve the assemblability of a counter gear interposed between one gear of a gear transmission mechanism and a detection gear. The object is to improve the meshing accuracy of the detection gear and the counter gear.

[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. 11 shows an example of such an adjusting device a for leveling, which is shown in Japanese Utility Model Laid-Open No. 13838/1990.

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 leveling adjusting device a, the detection gear m is supported by the rear case body d via the printed circuit board n, and the counter gear p is supported by the front case via the shaft q. It is supported by the body c and the rear case body d.

Therefore, the counter gear p is poorly assembled to the case b, and the meshing accuracy between the detection gear m and the counter gear p is as follows: the assembly accuracy of the two case bodies c and d, and the shaft o. Since it depends on the assembling accuracy, backlash may occur between the two, or conversely, the engagement may be tight.

[0014]

In view of the above, an illumination angle adjusting device for a headlight according to the present invention is one in which a gear holder that rotatably supports a counter gear is supported on a printed circuit board by a shaft that supports a detection gear on the printed circuit board. Is.

[0015]

Therefore, in the irradiation angle adjusting device for a headlight according to the present invention, the detection gear and the counter gear are both supported by the printed circuit board, so that the assembly is completed only by supporting the printed circuit board in the case. However, the assembling workability is significantly improved. Also, the gear holder that supports the counter gear is supported on the printed circuit board via the shaft that supports the detection gear on the printed circuit board, so there are very few factors that affect the meshing accuracy between the detection gear and the counter gear. , The accuracy of meshing between the detection gear and the counter gear is improved.

[0016]

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

First, an outline of the headlight device will be described.

In the drawing, reference numeral 1 denotes a headlight device, which is of a so-called reflecting mirror movable type, in which the irradiation axis is tilted by tilting the reflecting mirror. It was done.

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

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 a substantially upper one quarter is projected rearward as viewed from the front. 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, the rear end of which is fitted and adhered in the installation groove 4 of the lamp body 2.

Reference numeral 9 is 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, and 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.

Therefore, the spherical portion 11a of the fulcrum shaft 11 is
Into the receiving recess 12a of the ball receiver 12. Thereby, the universal joint-shaped fulcrum portion 13 is formed.

Reference numeral 14 denotes an adjusting 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 operation shaft rotatably supported on the rear surface of the lamp body 2, and a pinion gear 19 fixed to the lower end of the operation shaft is meshed with the crown gear 16. Reference numeral 20 denotes a head formed at the upper end of the operation shaft 18.
In this way, the first interval adjusting section 21 is formed.

Then, by using an appropriate tool, for example, a driver 22, the tip thereof 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 screwed in or unscrewed from the nut body 17,
The nut body 17 is relatively moved in the front-rear direction along the screw shaft portion 15, whereby the distance between the portion of the reflecting mirror 9 supporting the nut body 17 and the rear surface wall of the lamp body 2 is changed. It will be.

Reference numeral 23 is 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 denotes a DC motor fixed to the upper portion 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. The spur gear 28a is provided at one end of the gear body 28 and the worm 2 is provided at the center thereof.
8b are formed integrally with each other, 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.

Reference numeral 30 denotes a support, which is a cylindrical main portion 3
1 and a flange portion 32 projecting outward from a substantially central portion of the main portion 31 are integrally formed of synthetic resin.
A screw 33 is provided on the outer peripheral surface of
Are formed. Then, on the outer peripheral surface of the flange portion 32, two detent protrusions 32a are appropriately separated in the circumferential direction,
32a is protruded.

A cylindrical portion 34 projecting forward is formed at the lower end of the front case body 25a, and a cylindrical portion 35 projecting rearward is also formed at the lower end of the rear case body 25b corresponding to the cylindrical portion 34. Are formed.

Front plate 3 closing the front end of the cylindrical portion 34
A circular insertion hole 36a is formed in the center of 6,
The diameter of the insertion hole 36a is slightly larger than the outer diameter of the front portion 31a (hereinafter referred to as "insertion portion") from the flange portion 32 of the main portion 31 of the support 30.

The cylindrical portion 34 is formed on the inner surface of the front case body 25a.
A cylindrical support wall 37 is protruded from the rear end of the support wall 37, and a rear end face 37a of the support wall 37 is formed as a middle-curved curved surface.

Sliding grooves 38, 38 are formed on the inner surface of the cylindrical portion 34 and the inner surface of the support wall 37 so as to extend continuously in the front-rear direction and reach the rear end of the support wall 37.

The insertion portion 31a of the support body 30 is inserted into the insertion hole 36a formed in the front plate 36 of the cylindrical portion 34 of the front case body 25a, and the detent protrusions 32a and 32a of the support body 30 are formed. Sliding groove 3 of front case body 25a
8 and 38 are slidably engaged with the support 3
0 is slidable in the front-back direction with respect to the front case body 25a, but is supported so as not to rotate.

On the inner surface of the rear case body 25b, a cylindrical support wall 39 is provided so as to be continuous with the front end of the cylindrical portion 35, and the front end surface 39a of the support wall 39 is a curved surface with a middle protrusion. ing.

A partition wall 40 is formed at a position on the front side of the continuous portion of the cylindrical portion 35 and the support wall 39 to divide the continuous body of the cylindrical portion 35 and the support wall 39 into front and rear, and the central portion of the partition wall 40. The insertion hole 40a is formed.

Reference numeral 41 is an adjusting shaft, which is divided into three parts as a whole, and an intermediate cylindrical portion 41a, a front screw shaft portion 41b, and a rear prismatic portion 41c are integrally formed, and a rear end of the cylindrical portion 41a is formed. A flange 42 having a small amount of protrusion is integrally projectingly provided at the front end, and an annular engagement groove 43 is formed at the front end of the columnar portion 41a.

The adjusting shaft 41 is inserted into the main portion 31 of the support 30 from the rear side, and the column portion 41a is rotatably supported by the main portion 31 of the support 30. When the flange 42 of the adjustment shaft 41 comes into contact with the rear end face of the main part 31 of the support 30, the engaging groove 43 is formed in the main part 3 of the support 30.
A stop washer 44 is engaged with the engagement groove 43 to prevent the adjustment shaft 41 from coming off the support 30.

Reference numeral 45 denotes an output gear, in which a cylindrical nut portion 46 and a disc portion 47 projecting from a position near the front end of the nut portion 46 are integrally formed of synthetic resin, and the nut portion 46 The inner peripheral surface has a spiral groove 46a, and the disk portion 47
Are formed on the outer peripheral surface of the support member 3, respectively.
, The screw portion 46a of the main portion 31 of the main portion 31 is externally fitted to the portion behind the flange portion 32, the screw groove 46a thereof is screwed with the screw 33 of the support 30, and the gear teeth 47a, 47a,. Are meshed with the worm wheel 29. The prism portion 41 c of the adjustment shaft 41 is inserted through the insertion hole 40 a of the partition wall 40, and most of the prism portion 41 c is located in the cylindrical portion 35.

Further, the rear end portion 37a of the support wall 37 of the front case body 25a is located slightly in contact with or close to the front surface of the disc portion 47 of the output gear 45, and the support wall 39 of the rear case body 25b is provided. The front end surface 39a is a disk portion 47 of the output gear 45.
It is located in light contact with or in close proximity to the rear surface, and thereby defines the position of the output gear 45 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 35 is located so as to fit into the front end of the cylindrical portion 7 of the arrangement recess 6.

Reference numeral 48 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 41b of the adjusting shaft 41 is screwed to the nut body 48.

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 45.
Then, when the output gear 45 rotates, the support body 30 that is screwed into the output gear 45 and is prevented from rotating is sent forward or backward depending on the direction of rotation of the output gear 45. Therefore, the adjustment shaft 41 supported by the support 30 is
Will be sent forward or backward together with the mirror 9
Of the nut body 48 is moved forward or backward.

Reference numeral 49 is an aiming operation unit, and 50 is its case.

Reference numeral 51 is a connecting shaft, which is formed by fixing a crown gear 53 to the rear end of the connecting cylinder portion 52, and the connecting cylinder portion 52 is formed with a prismatic connecting hole 52a opened at the front end surface thereof. . The connecting shaft 51 is connected to the connecting cylindrical portion 52.
The rear end portion is rotatably supported by the case 50, and most of the connecting tubular portion 52 projects forward from the front surface of the case 50.

Reference numeral 54 denotes an operation shaft rotatably supported in a state perpendicular to the case 50, and a pinion gear 55 fixed to the lower end of the operation shaft meshes with the crown gear 53 of the connecting shaft 51. The head portion 56 formed on the upper end of the operation shaft 54 projects from the upper surface of the case 50. When the operating shaft 54 is rotated by using a suitable tool, for example, the driver 22, the rotation is controlled by the rotation of the pinion gear 5.
5, transmitted to the connection shaft 51 via the crown gear 53.

The aiming operation portion 49 constructed as described above is fixed to the lower right portion of the rear surface of the lamp body 2, and the connecting cylinder portion 52 of the connecting shaft 51 is inserted into the cylinder portion 7 of the lamp body 2. The prismatic portion 41c of the adjusting shaft 41 is slidably but non-rotatably inserted into the connecting hole 52a. Thus, the second interval adjusting unit 57 is configured.

Therefore, when the operating shaft 54 is rotated to rotate the connecting shaft 51 as described above, the adjusting shaft 41 connected to the connecting cylindrical portion 52 is rotated, and its screw is rotated according to the direction of the rotation. The shaft portion 41b is screwed into or unscrewed from the nut body 48 so that the nut body 48 is relatively screwed.
It is moved in the front-back direction along b, whereby the distance between the portion of the reflecting mirror 9 supporting the nut body 48 and the rear wall of the lamp body 2 is changed.

Reference numeral 58 is a control unit for controlling the amount of movement of the adjusting shaft 41, which comprises a printed circuit board and a detection gear.

The printed circuit board 59 is fixed to the inner surface of the rear case body 25b, and the required printed conductors 60, 60, ... Are formed on the front surface thereof.

A circular mounting hole 61 is formed at a position near the lower end of the printed board 59.

Reference numeral 62 denotes a detection gear, which is made of synthetic resin.

Reference numeral 63 denotes a disc-shaped main portion of the detection gear 62, a supported hole 64 is formed in the center thereof, and a relatively large circular concave portion 65 is formed in the rear surface thereof. The contacts 66, 66 are attached. The contacts 66, 66 and the printed conductor 60 on the printed board 59,
Details of 60, ... Are shown in the above-mentioned Japanese Utility Model Laid-Open No. 13838/1990, so the description thereof will be omitted.

A circular wall 67, which is slightly smaller than the main portion 63, projects from the front surface of the main portion 63, and gear teeth 68, 68, ... Are formed on the outer peripheral surface of the wall 67. Also,
An arcuate projecting wall 69 is provided on the inner peripheral surface of the circular wall 67 over a range of a little over 180 °, and both end surfaces 69 of this projecting wall 69 are projected.
a and 69b are stopper surfaces.

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

The shaft body 70 has a slightly thick cylindrical main portion 71 and a supported portion 72 continuous to the rear end of the main portion 71 and having a cylindrical outer diameter smaller than the outer diameter of the main portion 71. And main part 71
A positioning portion 73, which is continuous with the front end of the positioning portion 73 and has a cylindrical outer diameter larger than the outer diameter of the main portion 71, and a flange portion 74 which projects radially from the rear end of the positioning portion 73. The parts 71, 72, 73 and 74 are formed coaxially, and an insertion hole 75 penetrating the center of each of the parts 71, 72, 73 and 74 is formed. The outer diameter of the main portion 71 is formed to be the same as or slightly smaller than the diameter of the supported hole 64 of the detection gear 62.

Reference numeral 76 is a gear holder. Each part is integrally formed of synthetic resin.

Reference numeral 77 denotes a circular belt-shaped supported portion, the inner diameter of which is the same as or slightly larger than the outer diameter of the main portion 71 of the shaft body 70, and the outer diameter is inside the projecting wall 69 of the detection gear 62. The diameter is the same as or slightly smaller than the diameter of the contacting circles, and a stopper piece 78 projects outward from the outer edge.

Two supporting walls 79, 79 are provided on the outer peripheral edge of the supported portion 77 so as to project forward from positions circumferentially spaced from each other. A gear support plate 80 protruding toward one side is integrally connected, a leg piece 81 protruding rearward is provided at an outer end portion of the gear support plate 80, and a rear end surface of the leg piece 81 is engaged. Dowel pin 82
Is protruding.

Reference numeral 83 denotes a support shaft whose front end is caulked to the gear support plate 80 of the gear holder 76, and the counter gear 84 is rotatably supported on the support shaft 83.

The counter gear 84 is made of synthetic resin, and a small gear 84b is integrally formed on the rear surface of the large gear 84a.

Therefore, the main portion 71 of the shaft body 70 is
From the front side, the supported portion 77 of the gear holder 76 and the supported hole 64 of the detection gear 62 are inserted in this order, and then the supported portion 72 is inserted from the front side into the mounting hole 61 of the printed circuit board 59. At this time, the engagement pin 82 of the gear holder 76 is inserted into the positioning hole 85 provided in the printed board 59. Then, when the rear end surface 71a of the main portion 71 of the shaft body 70 abuts on the front side opening edge of the mounting hole 61 of the printed circuit board 59, the outer peripheral surface of the portion of the supported portion 72 protruding to the back side of the printed circuit board 59 is removed. The shaft body 70 is fixed to the printed circuit board 59 by crimping.

As a result, the detection gear 62 is rotatably supported by the printed circuit board 59 around the main portion 71 of the shaft body 70, and the counter gear 84 is also attached to the gear holder 7.
The small gear 8 supported by the printed circuit board 59 via
4b meshes with the gear teeth 68, 68, ... Of the detection gear 62.

The printed circuit board 59 is attached to the rear case body 2.
The detection gear 62 and the counter gear 84 are arranged at predetermined positions in the case 24 by being attached to the predetermined position of 5b.

The detection gear 62 is rotated between a position where one stopper surface 69a of the detection gear 62 contacts the stopper piece 78 of the gear holder 76 and a position where the other stopper surface 69b also contacts the stopper piece 78. It

In such a structure, the detection gear 62 and the counter gear 84 may be supported on the printed circuit board 59 in advance, and the printed circuit board 59 may be attached to the case 24. Therefore, the detection gear 62 and the counter gear 84 are assembled. The work is extremely simple, and the detection gear 62 and the counter gear 84 mesh with each other with high precision.

Even if the shaft body 70 is pressed from the front or the rear, the rear end surface 71a of the main portion 71 is in contact with the front surface of the printed circuit board 59, and the flange portion 74 and the front surface of the printed circuit board 59. The clearance between the detection gear 62 and the detection gear 62 is not always reduced, and a clearance for smooth rotation of the detection gear 62 is always secured.

Further, the contacts 66, 66 are arranged in the recess 65, and the outer peripheral edge of the rear surface of the main portion 63 is the printed circuit board 59.
Since it is in a state of being in light contact with, the detection portion including the contacts 66, 66 and the printed conductors 60, 60, ... Is located in the space surrounded by the printed board 59 and the detection gear 62. It can prevent invasion of dust etc.,
Improves reliability.

Furthermore, at the time of assembly, either the stopper surface 69a or 69b may be brought into contact with the stopper piece 78 to perform the initial setting, which facilitates the initial setting.

Reference numeral 86 denotes a shaft, which is inserted into the insertion hole 75 of the shaft body 70, and both front and rear ends thereof are located in the front case body 2.
The concave portion 87 formed on the inner surface of 5a and the concave portion 88 formed on the inner surface of the rear case body 25b are fitted and supported.

The worm wheel 29 is rotatably supported on the shaft 86.

A small gear portion 89 is integrally formed on the rear surface of the worm wheel 29, and a circular shape having a larger diameter than the central hole 29a of the worm wheel 29 and coaxial with the central hole 29a is formed on the rear surface of the small gear portion 89. A circular recess 90 is formed, and the inner diameter of the circular recess 90 is formed slightly larger than the outer diameter of the positioning portion 73 of the shaft body 70. The circular recess 90 defines the positioning portion 73 of the shaft body 70. By being fitted onto the detection gear 6 of the worm wheel 29.
2. The relative position with respect to the counter gear 84 is accurately determined, and the small gear portion 89 is reliably meshed with the large gear 84a of the counter gear 84.

In the control unit 58 as described above, the moving direction and the moving amount of the adjusting shaft 41 are decelerated and received as the rotating direction and the rotating amount of the worm wheel 29, whereby the adjusting shaft 41 moves. Perform accurate position control.

Although the embodiment described above is one in which the present invention is applied to a reflector-movable headlight device, the present invention can also be applied to a so-called unit-movable headlight device. . In addition, the headlamp device of the movable unit type is configured such that a headlamp unit formed by attaching a lens to a reflecting mirror supporting a light source so as to cover a front surface thereof is tiltably supported by a lamp housing supported by a vehicle body. It is a type of headlight device. When the present invention is applied to a headlight device of a movable unit type, the headlight unit serves as a tilting member.

[0081]

As is apparent from the above description, the irradiation angle adjusting device for a headlight according to the present invention is axially connected to a tilting member that changes the irradiation angle of the headlight when tilted. An irradiation angle adjusting device for a headlamp, comprising an adjusting shaft for tilting a tilting member by moving the output gear, the output gear for moving the adjusting shaft in the axial direction by rotating, and the rotation of the motor and the output gear. And a detection gear that detects the position of the adjusting shaft from the rotation angle of one of the gear transmissions.
The detection gear is rotatably supported on the printed circuit board, and has a counter gear interposed between the one gear and the detection gear.The gear holder that rotatably supports the counter gear is printed with the detection gear. It is characterized in that it is supported on the printed circuit board by a shaft supporting the circuit board.

Therefore, in the irradiation angle adjusting device for a headlight according to the present invention, the detection gear and the counter gear are both supported by the printed circuit board, so that the mounting is completed only by supporting the printed circuit board in the case. However, the assembling workability is significantly improved. Also, the gear holder that supports the counter gear is supported on the printed circuit board via the shaft that supports the detection gear on the printed circuit board, so there are very few factors that affect the meshing accuracy between the detection gear and the counter gear. , The accuracy of meshing between the detection gear and the counter gear is improved.

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 sectional view of a headlight device using the irradiation angle adjusting device of the headlight 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.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is an enlarged front view of a printed circuit board to which a counter gear and a detection gear are attached.

FIG. 8 is an enlarged right side view of the printed circuit board to which the counter gear and the detection gear are attached.

9 is an enlarged sectional view taken along line IX-IX in FIG.

FIG. 10 is an enlarged exploded perspective view showing the relationship between the adjustment shaft and the support.

FIG. 11 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 41 Adjustment shaft 45 Output gear 59 Printed circuit board 62 Detection gear 70 Shaft 76 Gear holder 84 Counter gear

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 59-195441 (JP, A) JP 1-283702 (JP, A) JP 1-283701 (JP, A) JP 1- 282045 (JP, A) Actual opening Sho 59-63045 (JP, U) Actual opening 61-131338 (JP, U)

Claims (1)

(57) [Claims] 1. An irradiation angle adjusting device for a headlight, comprising an adjusting shaft, which is connected to a tilting member for changing the irradiation angle of the headlight when tilted, and which tilts the tilting member by moving in the axial direction. The position of the adjustment shaft is one of the gear transmission mechanisms including an output gear that rotates to move the adjustment shaft in the axial direction, a motor, and a gear transmission mechanism that transmits the rotation of the motor to the output gear. A detection gear that detects from the rotation angle of the gear is provided, and the detection gear is rotatably supported on the printed circuit board, and has a counter gear interposed between the one gear and the detection gear. An illumination angle adjusting device for a headlight, wherein a gear holder rotatably supported is supported on a printed circuit board by a shaft supporting a detection gear on the printed circuit board.