JP2663309B2 - Headlight irradiation axis tilting 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 headlight tilting device for a headlight. More specifically, a new front structure that simplifies the support structure of an output gear that moves a drive shaft that tilts a tilting member such as a reflector or a headlight unit in the axial direction, and that minimizes problems due to dimensional errors. The present invention relates to an irradiation axis tilting device for a lamp.

[0002]

2. Description of the Related Art A tilting member for changing an irradiation axis by being tilted, and a leveling drive having a drive shaft connected to the tilting member and tilting the tilting member by moving in the axial direction are provided. There is an irradiation axis tilting device for a headlight, and in one of the irradiation axis tilting devices for a headlight, the rotational force of a reversible motor is transmitted to an output gear by a gear transmission mechanism, and the drive shaft is rotated by rotation of the output gear. Are moved in the axial direction.

For example, Japanese Patent Application Laid-Open No. 1-283701 and Japanese Patent Application Laid-Open No. 1-28
3702, German Patent Application No. 3,915,300
No. 3,915,302.

[0004] In the headlamp irradiation axis tilting device disclosed in the Japanese and German patent applications, the output gear includes a cylindrical portion and a disk portion integral with the cylindrical portion. A rear end portion is rotatably fitted to a support cylinder portion protruding from the case body, and a rear end thereof abuts against the inner surface of the case body. The ends abut or approach, thereby positioning the output gear in the axial direction.

However, according to the output gear supporting structure described above, since the cylindrical portion of the output gear is fitted to the supporting cylindrical portion of the case body, the frictional resistance of this portion is large,
There is a loss in torque transmission of the motor. Also, the output gear may rattle due to a slight molding error or assembly error,
Or, on the contrary, it may not be able to rotate.

[0006]

The conventional problems to be solved by the present invention are that there is a large loss in the transmission of the rotational force of the motor and that the output gear is loose due to a slight molding dimensional error or assembly error. It is a point that gets stuck or stuck.

[0007]

In order to solve the above-mentioned problems, the present invention provides an irradiation shaft tilting device for a headlamp in which an output gear is supported by a drive shaft positioned to penetrate a case back and forth. straight positioned to surround a portion of each drive shaft to the case body before and after forming the two split back and forth the case
A cylindrical support wall having substantially the same diameter is formed, and each distal end surface of the support wall is formed into a middle curved surface, and the distal end surface lightly contacts or approaches the disk portion of the output gear from front and rear. It is positioned so as to sandwich it.

[0008]

Therefore, in the irradiation shaft tilting device for a headlamp according to the present invention as described above, the position of the output gear in the axial direction is determined by lightly contacting the disk portion of the output gear from front and rear. Since it is a curved curved front end portion of the supporting wall of the adjacent case body, there is almost no frictional resistance between these supporting walls and the output gear, and therefore, there is almost no transmission loss of the rotational force of the motor. . In addition, since the play is determined by the gap between the two case bodies and the thickness of the output gear, extreme play in the output gear may occur due to dimensional errors and assembly errors in molding, and conversely, it may not move. There is no chill.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the irradiation axis tilting device for a headlamp according to the present invention will be described below with reference to the accompanying drawings.

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

Reference numeral 2 denotes a lamp body made of a synthetic resin, and has a concave portion 3 opened forward. 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 recess for arranging a leveling drive unit to be described later. The arrangement recess is formed such that a portion of the right end of the lamp body 2 except for approximately one-fourth of the upper portion as viewed from the front is projected rearward. An insertion hole is formed at a position near the lower end of the arrangement concave portion 6, and a cylindrical portion 7 protruding forward and rearward from an edge of the insertion hole is integrally formed.

Reference numeral 8 denotes a lens formed of a transparent glass or a synthetic resin. The rear end of the lens 8 is fitted into the mounting groove 4 of the lamp body 2 and is bonded thereto.

Reference numeral 9 denotes a reflecting mirror which is disposed 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, and a light bulb 1 is provided at the rear center thereof.
0 is detachably attached.

Reference numeral 11 denotes a fulcrum shaft which is planted forward and upward at the upper right side in the concave portion 3 of the lamp body 2, and a spherical portion 11a is integrally formed at the front end of the fulcrum shaft 11. I have.

Reference numeral 12 denotes a ball receiver 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 opened on the rear surface.

The spherical portion 11a of the fulcrum shaft 11
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 at the rear end of the screw shaft portion 15, and a 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 which is supported on the upper left side of the rear end of the reflecting mirror 9 so as to be tiltable within a certain range, and the screw shaft part 15 of the adjusting shaft 14 is screwed to the nut body 17. I have.

Reference numeral 18 denotes an operation shaft rotatably supported on the rear surface of the lamp body 2. A pinion gear 19 fixed to the lower end of the operation shaft 18 meshes 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.

The tip of the operating shaft 1 is engaged with the head 20 by using a suitable tool, for example, a driver 22.
When the motor 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 or unscrewed into 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 reflector 9 supporting the nut body 17 is The distance between the lamp body 2 and the rear wall is changed.

Reference numeral 23 denotes a leveling drive section, 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 combining a front case body 25a and a rear case body 25b which are divided into two parts, and is formed in a vertically long box shape.

Reference numeral 26 denotes a DC motor fixed to an upper portion of the case 24 in a direction in which its axial direction extends left and right, and a pinion gear 27 is fixed to a rotating 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 and a worm gear 2 at the center.
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 at a substantially central portion in 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 main part 3 having a cylindrical shape.
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 protruding forward is formed at the lower end of the front case body 25a , and a cylindrical portion 35 protruding rearward at a position corresponding to the cylindrical portion 34 at the lower end of the rear case body 25b. Are formed.

A circular insertion hole 36a is formed at the center of the front plate 36 which closes the front end of the front case body 25a, and the diameter of the insertion hole 36a is equal to the diameter of the main part 31 of the support 30.
Is slightly larger than the outer diameter of a portion 31a (hereinafter, referred to as “insertion portion”) in front of the flange portion 32.

The cylindrical portion 34 is provided 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.

The inner surface of the cylindrical portion 34 and the inner surface of the support wall 37 are formed with sliding grooves 38, 38 extending continuously in the front-rear direction and reaching the rear end of the support wall 37.

The insertion portion 31a of the support 30 is inserted into an insertion hole 36a formed in the front plate 36 of the cylindrical portion 34 of the front case body 25a, and the rotation preventing projections 32a, 32a of the support 30 are Sliding groove 3 of front case body 25a
8, 38 slidably engaged with the support 3
Numeral 0 is slidable in the front-rear direction with respect to the front case body 25a, but rotation is disabled.

A cylindrical support wall 39 is projected from the inner surface of the rear case body 25b 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 formed as a middle curved surface. ing.

A partition wall 40 for dividing the continuous body of the cylindrical portion 35 and the support wall 39 into front and rear portions is formed at a position slightly before the continuous portion between the cylindrical portion 35 and the support wall 39. An insertion hole 40a is formed.

Reference numeral 41 denotes an adjusting shaft, which is divided into three parts. An intermediate cylindrical portion 41a, a front screw shaft portion 41b, and a rear rectangular column portion 41c are integrally formed, and a rear end of the cylindrical portion 41a is formed. A flange 42 having a small protruding amount is integrally protruded, and an annular engaging groove 43 is formed at the front end of the cylindrical portion 41a.

The adjustment shaft 41 is inserted through the main portion 31 of the support 30 from behind, 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 disk portion 47 protruding at a position near the front end of the nut portion 46 are integrally formed of synthetic resin. A screw groove 46a is provided on the inner peripheral surface, and a disk portion 47 is provided.
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 37a of the support wall 37 of the front case body 25a is lightly in contact with or close to the front surface of the disk portion 47 of the output gear 45, and the rear end 37a of the support wall 39 of the rear case body 25b. The front end surface 39a is a disc portion 47 of the output gear 45.
, Is lightly in contact with or close to the rear surface, thereby defining the position of the output gear 45 in the front-rear direction in the case 24.

Thus, the leveling drive section 23 is arranged and fixed in the arrangement recess 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.

Numeral 48 denotes a nut body which is supported at the lower right side of the rear surface of the reflecting mirror 9 so as to be tiltable within a certain range, and a 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, the spur gear 28a, the worm 28b, the worm wheel 29, and the output gear 45.
Then, when the output gear 45 rotates, the support 30 screwed with the rotation and prevented from rotating is sent forward or backward according to the direction of rotation of the output gear 45. Therefore, the adjustment shaft 41 supported by the support 30 is
Together with the reflection mirror 9
Of the nut body 48 is moved forward or backward.

Reference numeral 49 denotes an aiming operation unit, and reference numeral 50 denotes the case.

Reference numeral 51 denotes a connecting shaft, which is formed by fixing a crown gear 53 to the rear end of the connecting cylindrical portion 52. The connecting cylindrical portion 52 has 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 protrudes forward from the front surface of the case 50.

An operation shaft 54 is rotatably supported in a state perpendicular to the case 50. A pinion gear 55 fixed to a lower end of the operation shaft 54 is engaged with the crown gear 53 of the connection shaft 51. The head 56 formed at 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 section 49 configured as described above is fixed to the lower right portion of the rear surface of the lamp body 2, and the connecting cylinder 52 of the connecting shaft 51 is inserted into the cylinder 7 of the lamp body 2. The prism portion 41c of the adjustment shaft 41 is slidably but non-rotatably inserted into the connection hole 52a. Thus, the second interval adjusting unit 57 is configured.

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 the screw is rotated in accordance with the direction of the rotation. The shaft portion 41b is screwed or unscrewed back into the nut body 48, and the nut body 48 is relatively moved in the front-rear direction along the screw shaft portion 41b, thereby supporting the nut body 48 of the reflecting mirror 9. The distance between the bent portion and the rear wall of the lamp body 2 is changed.

In the embodiment described above, the present invention is applied to a headlamp apparatus of a movable reflector type, but the present invention can also be applied to a headlight apparatus of a so-called movable unit. . 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.

[0048]

As is apparent from the above description, the irradiation axis tilting device of the headlight according to the present invention comprises a tilting member for changing the irradiation axis by being tilted, and the tilting member being connected to the tilting member. A leveling drive unit having a drive shaft for tilting the tilting member by moving in the axial direction, the leveling drive unit transmitting a reversible rotary motor and a rotational force of the motor into a case formed in front and rear halves. And a gear transmission mechanism for outputting as a movement of the drive shaft in the axial direction, the gear transmission mechanism including an output gear supported by the drive shaft positioned to penetrate the case back and forth, and Each of the case bodies has a cylindrical support wall having substantially the same diameter and located so as to surround a part of the drive shaft, and each end face of the support wall is formed as a middle curved surface.
The distal end face is located so as to lightly contact or sandwich the disk portion of the output gear from front and rear.

Therefore, in the irradiation shaft tilting device for a headlamp of the present invention as described above, the position of the output gear in the axial direction is determined by lightly contacting the disk portion of the output gear from front and rear. Since it is the curved front end of the support wall of the adjacent case body, there is almost no frictional resistance between the support wall and the output gear, and therefore, the rotational force of the motor is reduced. There is almost no transmission loss. In addition, since the play is determined by the gap between the two case bodies and the thickness of the output gear, extreme play in the output gear may occur due to dimensional errors and assembly errors in molding, and conversely, it may not move. There is no chill.

It should be noted that the specific shapes and structures shown in the above embodiments are only examples of the embodiment of the present invention, and the technical scope of the present invention is limited by these. It must not be interpreted in a way.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a headlight device.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

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

FIG. 4 is an enlarged vertical sectional view of a leveling drive unit.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a partially cutaway exploded perspective view showing an enlarged main part of the leveling drive unit.

[Explanation of symbols]

9 Tilting member 23 Leveling drive unit 24 Case 25a Front case body 25b Rear case body 26 Motor 27, 28a, 28b, 29, 45 Gear transmission mechanism 37 Support wall 37a Tip surface 39 Support wall 39a Tip surface 41 Drive shaft 45 Output gear 47 Disk part

Claims (1)

(57) [Claims] A tilting member that changes an irradiation axis by being tilted, and a leveling drive unit that is connected to the tilting member and has a drive shaft that tilts the tilting member by moving in an axial direction; Leveling drive unit is front and back 2
A reversible rotation motor and a gear transmission mechanism that transmits the rotational force of the motor and outputs it as movement in the axial direction of the drive shaft in a split case, wherein the gear transmission mechanism moves the case back and forth. An output gear supported by the drive shaft positioned therethrough, and a diameter of each of the case bodies before and after the case positioned so as to surround a part of the drive shaft.
Have substantially the same cylindrical support wall, and each end face of the support wall
Is a curved mid-collision surface, and the tip end surface is positioned so as to lightly contact or sandwich the disk portion of the output gear from front and rear from front to back, and the irradiation axis tilting device for a headlight is characterized in that