JP2010049861A - Vehicular head lamp - Google Patents

Abstract

The present invention provides a vehicle headlamp that can prevent a bearing from falling off and can improve the assembly workability and reduce the number of assembly steps.
A lamp unit comprising at least a light source, a reflector, and a lens incorporated in a lens holder, a bracket 3 that rotatably supports the lamp unit about an upper rotating shaft and a lower rotating shaft, and a lamp unit of the lamp unit. In a vehicle headlamp comprising an actuator 4 disposed below and rotating the lamp unit, the lower rotating shaft being rotatably supported on the bracket 3 via a single bearing 14; The bearing 14 can be inserted and fitted into the bracket 3 from the front (or rear), and a positioning rib 10 a that abuts against the end surface on the opposite side of the bearing 14 is provided on the actuator 4.
[Selection] Figure 7

Description

  The present invention relates to an AFS (Adaptive Front-lighting System) type vehicle headlamp that changes the light irradiation direction in accordance with the traveling state of the vehicle.

  In order to improve the safety of the vehicle when it travels at night, an AFS type vehicle headlamp that changes the light irradiation direction following the steering direction of the vehicle has been proposed and is already in practical use. To FIG.

  11 is a perspective view showing a conventional example of an AFS type vehicle headlamp, FIG. 12 is an exploded perspective view showing a part of the vehicle headlamp, and FIG. 13 is a vehicle headlamp. 2 is a perspective view of a bracket and an actuator excluding the lamp unit. A vehicle headlamp 101 shown in the figure includes a lamp unit 102, a bracket 103 that rotatably supports the lamp unit 102, and the lamp unit 102. The actuator 104 to be moved is included.

  By the way, the lamp unit 102 rotates left and right around an upper shaft 122 that is integrally provided on the upper portion of the lens holder 105 and a lower shaft 113 that is an output shaft that projects vertically from the upper surface of the actuator 104. As shown in FIG. 12, the upper part is rotatably supported by the bracket 103 via a bearing 123 that rotatably supports the upper shaft 122, and the lower part is a bearing (not shown) formed on the lower surface of the lens holder 105. The bracket 103 is rotatably supported by a lower shaft (output shaft) 113 that fits into the recess.

  Here, as shown in FIGS. 11 and 12, the lamp unit 102 is urged downward by a shaft spring 124 that abuts the upper end of the upper shaft 122. The shaft spring 124 and the bearing 123 are It is fixed to the bracket 103 by a bearing holder 126 attached to the bracket 103 from the front by a single screw 125.

  On the other hand, the lower shaft (output shaft) 115 is rotatably supported on the bracket 103 by a bearing 114 as shown in FIG. 11, but as shown in FIG. Is formed with a fitting recess 103a having a shape along the outer shape of the bearing 114, and a ring-shaped bearing 114 is fitted and fixed to the fitting recess 103a from above.

  By the way, regarding the AFS type vehicle headlamp, Patent Document 1 discloses that a lower bearing (bearing) is provided on a lower shaft (lower shaft) of a light irradiation device (lamp unit), and a lower bearing holder is provided on a support member (bracket). The light irradiation device is reliably maintained horizontally with respect to the support member by providing a horizontal maintaining portion that maintains the lower bearing holder horizontally with respect to the support member between the lower bearing holder and the support member. Such a configuration has been proposed.

In Patent Document 2, a lamp unit is divided into a front irradiation means (lens, reflector and shade) and a linear light source in order to reduce the weight load on the light distribution control means (actuator). A configuration has been proposed in which only the front irradiation means is fixed around the vehicle body frame and rotated about the vertical axes (upper and lower axes) by the light distribution control means.
JP 2006-224898 A JP 2006-179246 A

  In assembling the conventional vehicle headlamp 101 shown in FIGS. 11 to 13, a single bearing 114 is fitted into the fitting recess 103 a of the bracket 103 from the upper front side, and includes a lamp unit 102 other than the actuator 104. After the combined component is assembled to the bracket 103 from the front, the actuator 104 is assembled to the bracket 103 from below. However, since the bearing 114 is easily dropped during this assembly, the bearing 114 is tilted. It is necessary to assemble from above. For this reason, the process of inclining the bracket 103 is added to the assembling process, and there are problems that the assembling man-hour increases and the workability is poor.

  In order to prevent the bearing 114 from falling off, it is necessary to manage the dimensions of the bearing 114 and the fitting recess 103a of the bracket 103 into which the bearing 114 is fitted. Also, as shown in FIG. Although the rib 114a was formed, it was impossible to reliably prevent the bearing 114 from falling off.

  Further, in the conventional vehicle headlamps shown in FIGS. 11 to 13 and the vehicle headlamps disclosed in Patent Documents 1 and 2, the lower shaft passes through a circular hole formed in the bracket. For this reason, the lamp unit cannot be assembled in one direction (front) with respect to the bracket, so that the assembling workability is poor and the number of assembling steps increases.

  The present invention has been made in view of the above-described problems, and the object of the present invention is a vehicle front which can prevent the bearing from falling off and can improve the assembly workability and reduce the number of assembly steps. To provide a lighting.

  In order to achieve the above object, the invention according to claim 1 is a lamp unit comprising at least a light source, a reflector, and a lens incorporated in a lens unit, and supports the lamp unit so as to be rotatable about an upper shaft and a lower shaft. And a bracket for driving the vehicle, the actuator being arranged below the lamp unit and rotating the lamp unit, wherein the lower shaft is rotatably supported by the bracket via a single bearing. The illumination lamp is characterized in that the bearing can be inserted and fitted into the bracket from the front or the rear, and a positioning rib that abuts against an end surface on the opposite side of the bearing is provided on the actuator.

  According to a second aspect of the present invention, in the first aspect of the invention, the bracket is formed with a rectangular fitting hole whose front or rear is opened, and is fitted to the periphery of the fitting hole at the outer peripheral portion of the bearing. The fitting groove to be formed is formed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the lower shaft is constituted by a shaft integrally projecting from a lower portion of the lens holder, and the shaft is connected to the output shaft of the actuator. It is characterized by that.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the lower shaft is constituted by the output shaft of the actuator, and the output shaft is fitted in a bearing recess formed in the lens holder. It is characterized by that.

  According to the first aspect of the present invention, since the bearing can be inserted and fitted to the bracket from the front or the rear, the lamp unit is assembled to the bracket from one direction from the front or the rear with the bearing being assembled to the lamp unit. As a result, the assembling workability of the lamp unit can be improved, the number of assembling steps can be reduced, and the bearing can be reliably prevented from falling off. In addition, when the actuator is assembled to the bracket to which the lamp unit is assembled, the positioning ribs of the actuator come into contact with the end surface on the non-insertion side of the bearing. Is prevented.

  According to the second aspect of the present invention, the bearing is inserted from one direction of the front or rear from the opening of the rectangular fitting hole formed in the bracket, and the fitting groove formed in the outer peripheral portion of the bearing is inserted into the bracket. A bearing can be assembled | attached to a bracket from one direction of the front or back by making it fit to the periphery of a fitting hole.

  According to the third aspect of the present invention, the rotation of the output shaft of the actuator is transmitted to the lamp unit via the shaft integrally projecting from the lower portion of the lens holder, and the lamp unit is mounted on the lower shaft using the shaft as the lower shaft. It can be rotated as a center.

  According to the fourth aspect of the present invention, the output shaft of the actuator is the lower shaft, and the rotation of the output shaft is transmitted to the lamp unit through the bearing recess formed in the lower portion of the lens holder. It can be rotated as a center.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
1 is a side sectional view of a vehicle headlamp according to Embodiment 1 of the present invention, FIG. 2 is an enlarged detail view of a portion A in FIG. 1, FIG. 3 is an enlarged detail view of a portion B in FIG. 5 is an exploded perspective view showing a part of the vehicle headlamp, FIG. 5 is an exploded perspective view of the upper part of the vehicle headlamp, and FIG. 6 is a plan view showing the shaft-mounted holder of the vehicle headlamp omitted. FIGS. 7 and 7 are exploded perspective views showing a structure for incorporating a bearing in the vehicle headlamp.

  The vehicle headlamp 1 according to the present embodiment is provided on the left and right of the front portion of the vehicle. Each vehicle headlamp 1 includes a lamp unit 2 and a bracket 3 that rotatably supports the lamp unit 2. The actuator 4 for rotating the lamp unit 2 is included.

  Here, as shown in FIG. 1, the lamp unit 2 includes a light source 6 such as a discharge tube, a reflector 7, a shade 8, and a lens holder 5 in which a lens 9 is incorporated. The actuator 4 is arranged below the lamp unit 2, and is constructed by incorporating a transmission mechanism (not shown) including a motor 11 as a drive source and a gear train in a housing 10. Note that a stepping motor is preferably used as the motor 11.

  As shown in FIG. 7, the bracket 3 is formed in a rectangular frame shape, and a rectangular cut-out fitting hole 12 opening forward is formed in the center in the width direction of the horizontal portion 3A below the bracket 3. A rib-like fitting protrusion 12a is integrally provided on the inner peripheral edge of the fitting hole 12. The lamp unit 2 is inserted and held in the opening 3a formed in the vertical portion 3B of the bracket 3 as shown in FIGS. 1, 4 and 6, and the lamp unit 2 The upper and lower parts are supported by the bracket 3 so as to be rotatable left and right about the vertical rotation axis a shown in FIGS.

  That is, as shown in FIGS. 1 and 2, a lower shaft 13 is integrally protruded vertically downward at the center in the width direction (above the rotation axis a) of the lens holder 5 made of resin. The lower shaft 13 is rotatably supported by the horizontal portion 3 </ b> A of the bracket 3 via a bearing 14. Here, the bearing 14 is integrally formed in a rectangular plate shape with a resin such as highly slidable lubricating PPS (polyphenylene sulfide), and as shown in FIG. 7, a circular hole 14a is formed in the vertical direction at the center thereof. The fitting groove 14b is formed in the periphery. As a material for the bearing 14, in addition to PPS, a resin containing a lubricant such as an oil-containing polyacetal, an oil-containing polyolefin, an oil-containing polyamide, and an oil-containing polyester, or a fluorine-based resin can be used.

  On the other hand, an output shaft 15 protrudes from the center of the upper surface of the housing 10 of the actuator 4 in the width direction (on the rotation axis a), and a positioning rib 10a that is long in the width direction protrudes integrally from the front end of the upper surface of the housing 10. . As shown in FIG. 7, a fitting groove 15 a into which the lower end portion of the lower shaft 13 formed integrally with the lens holder 5 is fitted is formed in the upper portion of the output shaft 15.

  Thus, when the lamp unit 2 is assembled to the bracket 3 from the front in a state where the bearing 14 is assembled to the lamp unit 2 through the lower shaft 13 of the lens holder 5 in the 14 circular hole 14a of the bearing, the bearing 14 is shown in FIG. As shown by an arrow, the fitting hole 12 formed in the horizontal portion 3A of the bracket 3 is fitted from the front opening. Then, since the fitting protrusion 12a formed on the inner peripheral edge of the fitting hole 12 on the bracket 3 side is fitted into the fitting groove 14b of the bearing 14, the bearing 14 is assembled to the horizontal portion 3A of the bracket 3, and the lamp The lower part of the unit 2 is rotatably supported by the bracket 3 by the lower shaft 13 and the bearing 14.

  Next, a structure for supporting the lamp unit 2 on the bracket 3 will be described.

  As shown in FIGS. 1 and 3 to 5, a cylindrical boss-shaped bearing recess 16 is integrally formed at the center in the width direction (on the rotation axis a) of the lens holder 5. Accommodates a tongue-shaped spring portion 5A formed integrally with the lens holder 5 substantially horizontally. Here, as shown in FIGS. 3 and 6, a gap δ is formed between a part of the outer periphery of the spring portion 5A and the inner periphery of the bearing recess 16, and the spring portion 5A is deformed by bending. Demonstrate spring characteristics. A hemispherical protrusion 5a is provided on the upper surface of the center of the spring portion 15A.

  By the way, a holder 17 with a shaft is attached to the central portion in the width direction of the vertical portion 3B of the bracket 3. This holder 17 with a shaft is integrally formed of a resin such as PPS having high slidability, and the center in the width direction. A columnar shaft 17a constituting the upper shaft is integrally projected downward from the lower portion.

  Thus, when the lamp unit 2 to which the bearing 14 is assembled as described above is assembled from the front with respect to the bracket 3 and its lower part is rotatably supported by the bracket 3, the lens holder 5 of the lamp unit 2 is supported. The shaft 17a of the shaft-equipped holder 17 is fitted into the bearing recess 16 formed in the above, and the lower surface of the shaft 17a is brought into contact with the protrusion 5a of the spring portion 5A of the lens holder 5 to press the spring portion 5A downward. 4 and 5, while maintaining this state, a screw 19 inserted from the front into a circular hole 18 penetrating the left and right of the shaft holder 17 is inserted in the width direction of the vertical portion 3B of the bracket 3. If screwed into the left and right screw holes 20 formed at the upper center, the holder 17 with the shaft is attached to the bracket 3, and the upper portion of the lamp unit 2 is fitted with the bearing recess 16 and the shaft 17a of the shaft holder 17 fitted therein. It is supported by the bracket 3 via a via. At this time, since the lamp unit 2 is always pressed downward by the reaction force of the spring portion 5A of the lens holder 5, the play due to the fitting of the fitting 15a (see FIG. 7) of the lower shaft 13 and the output shaft 15 is not stable. It does not occur, and parts such as a spring for absorbing this play can be omitted.

  When the lamp unit 2 is assembled to the bracket 3 as described above, the actuator 4 is assembled to the horizontal portion 3A of the bracket 3 from below, and the lamp unit 2 is inserted into the fitting groove 15a formed in the output shaft 15 of the actuator 4. The lower end of the lower shaft 13 on the side is fitted, whereby the output shaft 15 and the lower shaft 13 are connected. When the actuator 4 is assembled to the bracket 3, as shown in FIG. 1, the positioning rib 10a projecting from the front end of the upper surface of the housing 10 of the actuator 4 comes into contact with the end surface on the side opposite to the insertion side of the bearing 14. 14 is accurately positioned, and its drop-off, rotation and misalignment are reliably prevented.

  Thus, in the vehicle headlamp 1 assembled as described above, the vehicle travels such as the steering angle of the steering wheel detected by a steering sensor (not shown) and the vehicle speed detected by a vehicle speed sensor (not shown). When information is input to an electronic control unit (not shown), the electronic control unit outputs a control signal based on the information to the actuator 4 to drive and control the motor 11 of the actuator 4. Then, the rotation of the output shaft 15 of the actuator 4 is transmitted to the lamp unit 2 through the lower shaft 13, and the lamp unit 2 rotates to the left and right about the rotation axis a, and the light according to the traveling state of the vehicle. Follow and change the irradiation direction.

  As described above, in the vehicle headlamp 1 according to the present embodiment, the bearing 14 can be inserted and fitted to the bracket 3 from the front, and the shaft-mounted holder 17 can also be attached to the bracket 3 from the front by the screw 19. As a result, the lamp unit 2 can be assembled to the bracket 3 from one direction in a state where the bearing 14 is assembled to the lamp unit 2, and as a result, the assembling workability of the lamp unit 2 is improved. Thus, the number of assembling steps can be reduced, and the bearing 14 can be reliably prevented from falling off.

  Further, in a state where the actuator 4 is assembled to the bracket 3 to which the lamp unit 2 is assembled from below, the positioning rib 10a of the actuator 4 contacts the opposite end surface of the bearing 14, so that the bearing 14 is accurately positioned, The drop-off, rotation, and positional deviation are reliably prevented.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  8 is a side sectional view of a vehicle headlamp according to Embodiment 2 of the present invention, FIG. 9 is an enlarged detail view of a portion C in FIG. 8, and FIG. 10 shows a structure for incorporating a bearing in the vehicle headlamp. In these drawings, the same components as those shown in FIGS. 1 to 7 are denoted by the same reference numerals, and the repetitive description thereof will be omitted below.

  The vehicular headlamp 1 'according to the present embodiment includes a lower shaft that rotatably supports the lower portion of the lamp unit 2 on the bracket 3 as an output shaft 15 of the actuator 4, and the output shaft 15 is a lens. It is characterized by being fitted into a bearing recess 21 formed in the holder 5, and the other configuration is the same as that of the vehicle headlamp 1 according to the first embodiment.

  Thus, also in the vehicle headlamp 1 ′ according to the present embodiment, the rotation of the output shaft 15 of the actuator 4 is transmitted from the output shaft 15 constituting the lower shaft to the lamp unit 2 through the bearing recess 21. The lamp unit 2 rotates to the left and right around the rotation axis a, and changes the light irradiation direction in accordance with the traveling state of the vehicle.

  Therefore, also in the present embodiment, the same effects as those of the first embodiment can be obtained, and the lamp unit 2 can be assembled to the bracket 3 from one front direction with the bearing 14 assembled to the lamp unit 2. As a result, the assembling workability of the lamp unit is improved, the number of assembling steps is reduced, and the bearing 14 is reliably prevented from falling off.

  Further, in a state where the actuator 4 is assembled to the bracket 3 to which the lamp unit 2 is assembled from below, the positioning rib 10a of the actuator 4 contacts the opposite end surface of the bearing 14, so that the bearing 14 is accurately positioned, The drop-off, rotation, and positional deviation are reliably prevented.

  In the above embodiment, the configuration in which the bearing is inserted and fitted into the bracket from the front is adopted. However, the same effect as described above can be obtained even when the configuration in which the bearing is inserted and fitted into the bracket from the rear is adopted. Can be obtained.

It is a sectional side view of the vehicle headlamp which concerns on Embodiment 1 of this invention. It is the A section enlarged detail drawing of FIG. It is the B section enlarged detail drawing of FIG. It is a perspective view which decomposes | disassembles and shows a part of vehicle headlamp which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the vehicle headlamp upper part which concerns on Embodiment 1 of this invention. It is a top view which abbreviate | omits and shows the holder with a shaft of the vehicle headlamp which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the built-in structure of the bearing in the vehicle headlamp which concerns on Embodiment 1 of this invention. It is a sectional side view of the vehicle headlamp which concerns on Embodiment 2 of this invention. It is the B section enlarged detail drawing of FIG. It is a perspective view which shows the built-in structure of the bearing in the vehicle headlamp which concerns on Embodiment 2 of this invention. It is a perspective view of the conventional vehicle headlamp. It is a perspective view which decomposes | disassembles and shows a part of conventional vehicle headlamp. It is a perspective view of the bracket and actuator except the lamp unit of the conventional vehicle headlamp. It is a perspective view of the bearing which supports the lamp unit of the conventional vehicle headlamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 'Vehicle headlamp 2 Lamp unit 3 Bracket 3A Horizontal part of bracket 3B Vertical part of bracket 3a Opening part of bracket 4 Actuator 5 Lens holder 5A Spring part of lens holder 5a Projection on spring part 6 Light source 7 Reflector 8 Shade 9 Lens 10 Actuator housing 10a Positioning rib 11 Motor 12 Bracket fitting hole 12a Fitting projection 13 Lower shaft 14 Bearing 14a Bearing circular hole 14b Bearing fitting groove 15 Actuator output shaft 15a Output shaft fitting groove 16 Bearing recess 17 Shaft holder 17a Shaft holder shaft 18 Shaft holder circular hole 19 Screw 20 Bracket screw hole 21 Bearing recess a Rotating shaft δ Gap

Claims (4)

A lamp unit including at least a light source, a reflector, and a lens in a lens holder; a bracket that rotatably supports the lamp unit about an upper shaft and a lower shaft; and a lamp unit disposed below the lamp unit. In a vehicle headlamp comprising an actuator for rotating the unit, and configured to rotatably support the lower shaft on the bracket via a single bearing,
A vehicle headlamp characterized in that the bearing can be inserted and fitted into the bracket from the front or the rear, and a positioning rib that abuts against an end surface on the opposite side of the bearing is provided on the actuator.   2. A rectangular fitting hole having a front or rear opening is formed in the bracket, and a fitting groove is formed on an outer peripheral portion of the bearing to be fitted to a peripheral edge of the fitting hole. Vehicle headlamps.   3. The vehicular headlamp according to claim 1, wherein the lower shaft is constituted by a shaft integrally projecting from a lower portion of the lens holder, and the shaft is connected to an output shaft of the actuator. .   The vehicular headlamp according to claim 1 or 2, wherein the lower shaft is configured by an output shaft of the actuator, and the output shaft is fitted in a bearing recess formed in the lens holder.

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