JP6153332B2 - Vehicle headlamp - Google Patents

Description

  The present invention relates to a vehicle headlamp. Specifically, the present invention relates to a technical field in which a driving force of an actuator is transmitted to a movable shade to rotate the movable shade.

JP 2007-213938 A

  Some vehicle headlamps include, for example, a lamp unit having a light source or the like disposed inside a lamp outer casing constituted by a cover and a lamp housing.

  Such a lamp unit is provided with a light amount control mechanism for controlling the amount of light emitted from the light source, the light amount control mechanism changing the shielding amount of the light emitted from the light source, and an actuator for operating the movable shade; (For example, refer to FIG. 4 of Patent Document 1).

  In the vehicle headlamp described in Patent Document 1, an output shaft of an actuator (solenoid) positioned on the front side and a movable shade positioned on the rear side of the actuator are wire-shaped arms (link members). Are connected by One end portion of the arm is rotatably connected to the output shaft, and the other end portion (folded portion) is slidably engaged with the engaging portion of the movable shade. The movable shade is rotatable about a pivot shaft extending left and right.

  When the output shaft of the actuator is moved in the left-right direction, the arm is rotated, the bent portion of the arm is slid by the engaging portion of the movable shade, and the movable shade is rotated about the rotation shaft.

  When the movable shade is rotated to the first position, the mode is switched to the low beam irradiation mode for irradiating a short distance, and for the high beam for irradiating a long distance by the movable shade being rotated to the second position. Switch to irradiation mode.

  By the way, in the type provided with the movable shade which controls the light radiate | emitted from the light source like the vehicle headlamp described in patent document 1, for example, a movable shade is provided in the front side or the rear side of a rotating shaft. When the entire structure is located, the weight balance of the movable shade is poor, and it becomes necessary to use a large actuator with large driving force as an actuator for rotating the movable shade. This will hinder downsizing the headlamps and reducing manufacturing costs.

  Therefore, in order to secure a weight balance in such a case, it is conceivable to attach a counterweight to the movable shade, but if the counterweight is attached to the movable shade, the weight of the movable shade will increase, and again It is necessary to use an actuator with a large driving force.

  Accordingly, an object of the vehicle headlamp according to the present invention is to overcome the above-described problems and to achieve a good weight balance of the movable shade without increasing the weight and to reduce the size.

In order to solve the above-described problem, a vehicle headlamp has a lamp unit disposed inside a lamp outer casing formed by a lamp housing having an opening on at least one side and a cover covering the opening of the lamp housing. The lamp unit includes a light source unit having a light source, a rotatable movable shade that switches a shielding amount of light emitted from the light source, and an actuator that rotates the movable shade. And a rotation shaft that functions as a rotation fulcrum of the movable shade and whose axial direction is the left-right direction, and at least an upper end portion of the movable shade is located behind the rotation shaft and is at least of the movable shade. A lower end portion is positioned on the front side of the rotation shaft, and a support plate for supporting the rotation shaft is provided, and is emitted from the light source to the support plate. A pair of light-shielding portion is provided to shield a part of light, in which the pair of light blocking portion is positioned spaced apart to the left and right at the rear side of the lower end portion of the movable shade.

  Therefore, in the vehicle headlamp, the upper end and the lower end of the movable shade are positioned before and after the rotation shaft.

The vehicle headlamp according to the present invention is a vehicle headlamp in which a lamp unit is arranged inside a lamp outer casing formed by a lamp housing having an opening in at least one side and a cover covering the opening of the lamp housing. The lamp unit includes a light source unit having a light source, a rotatable movable shade that switches a shielding amount of light emitted from the light source, an actuator that rotates the movable shade, and a rotation of the movable shade. A rotating shaft that functions as a moving fulcrum and whose axial direction is set to the left-right direction, and at least an upper end portion of the movable shade is positioned behind the rotating shaft, and at least a lower end portion of the movable shade is the rotating shaft. A support plate that supports the rotating shaft is provided, and the support plate shields a part of the light emitted from the light source. Shielding portion is provided with, wherein the pair of light blocking portion is positioned spaced apart to the left and right at the rear side of the lower end portion of the movable shade.

Therefore, a good weight balance of the movable shade is ensured, and a small actuator having a small driving force can be used as an actuator for rotating the movable shade, and the vehicle headlamp can be miniaturized. . And the lower end part of a movable shade does not contact each part located in the rear side, for example, a light source unit, and can aim at the effective utilization of space and the simplification of a design. Then, regardless of the position of the movable shade, the light is shielded by the light shielding portion, and the influence on the light distribution pattern due to the light passing through the periphery of the movable shade can be prevented.

According to the second aspect of the present invention, a biasing spring that biases the movable shade in one direction is provided, and the biasing spring is located on the rear side of the movable shade.

  Therefore, the light emitted to the front side of the movable shade is not reflected and shielded by the urging spring and the respective portions supporting the urging spring, and a good light distribution pattern can be formed.

2 to 8 show an embodiment of the vehicle headlamp of the present invention, and this figure is a schematic longitudinal sectional view. It is a disassembled perspective view of a light quantity control mechanism. It is sectional drawing which shows the state in which the movable shade is hold | maintained in the 1st position. It is sectional drawing which shows the state in which the movable shade is hold | maintained in the 2nd position. It is a perspective view which shows the state in which the movable shade is hold | maintained in the 1st position. It is a bottom view which shows the state in which the movable shade is hold | maintained in the 1st position. It is a perspective view which shows the state by which the movable shade is hold | maintained in the 2nd position. It is a bottom view which shows the state in which the movable shade is hold | maintained in the 2nd position.

  EMBODIMENT OF THE INVENTION Below, the form for implementing the vehicle headlamp of this invention is demonstrated with reference to an accompanying drawing.

  The vehicle headlamps 1 are respectively attached to the left and right end portions of the front end portion of the vehicle body.

  The vehicle headlamp 1 includes a lamp housing 2 having a recessed portion opened forward and a cover 3 that closes the opening of the lamp housing 2 (see FIG. 1). The lamp housing 2 and the cover 3 constitute a lamp outer casing 4, and the inner space of the lamp outer casing 4 is formed as a lamp chamber 5.

  A mounting hole 2 a penetrating in the front-rear direction is formed at the rear end of the lamp housing 2. A back cover 6 is attached to the attachment hole 2a.

  A lamp unit 7 is disposed in the lamp chamber 5. The lamp unit 7 includes a lens holder 8, a projection lens 9 attached to the front end of the lens holder 8, a reflector 10 that reflects light, a light source unit 11 that is disposed below the reflector 10, and a lower surface side of the light source unit 11. The cooling fan 12 is provided.

  The projection lens 9 is formed in a substantially hemispherical shape and is attached to the lens holder 8.

  The inner surface of the reflector 10 is formed as a reflecting surface 10a. The reflector 10 is attached to the upper surface of the light source unit 11.

  The light source unit 11 includes a circuit board 13 and a light source 14 mounted on the upper surface of the circuit board 13. As the light source 14, for example, a light emitting diode (LED) is used. The light source unit 11 is provided with a heat sink 15 located below the circuit board 13. The cooling fan 12 is disposed inside the heat sink 15.

  A light amount control mechanism 16 is disposed on the front side of the light source unit 11.

  The light quantity control mechanism 16 includes a movable shade 17, a support plate 18, a rotating shaft 19, a link member 20, a solenoid 21, and a cover body 22 (see FIGS. 1 and 2).

  The movable shade 17 includes a light amount control unit 23 formed in a substantially arcuate shape, and regulation protrusions 24 and 24 projecting outward (sideward) from the left and right ends of the light amount control unit 23, and a lower part of the light amount control unit 23. The inclined surface portion 25 provided continuously on the side and the supported portions 26, 26 projecting rearward from the left and right end portions of the inclined surface portion 25, respectively, and the sliding provided continuously at one end in the left-right direction of the inclined surface portion 25. Part 27.

  The inclined surface portion 25 is inclined so as to be displaced forward as it goes downward. A shallow concave portion 25a is formed in the inclined surface portion 25 except for both left and right end portions on the front side.

  Mounting holes 26a, 26a penetrating left and right are formed in the supported portions 26, 26.

  On the rear surface of the sliding portion 27, a protruding portion 28 protruding backward is provided. The protrusion 28 is formed, for example, in a substantially hemispherical shape, and the surface 28a is formed in a spherical surface. The surface 28a is not limited to a spherical surface, and at least a part may be formed as a curved surface.

  Bearings 29 and 29 are attached to the supported portions 26 and 26, respectively. The bearing 29 includes a large-diameter portion 29 a and a small-diameter portion 29 b. The small-diameter portion 29 b is inserted into the attachment hole 26 a and attached to the supported portion 26, and the large-diameter portion 29 a is positioned outside the supported portion 26.

  The support plate 18 includes a base surface portion 30 facing in the front-rear direction and a mounting surface portion 31 protruding forward from the base surface portion 30.

  The base surface portion 30 is formed with a light transmission hole 30a and an arrangement hole 30b spaced apart from each other in the vertical direction. A portion of the base surface portion 30 around the light transmission hole 30 a functions as a fixed shade that blocks a part of the light emitted from the light source 14. Bearing pressing pieces 32, 32 projecting rearward are provided at the opening edge of the light transmitting hole 30a so as to be separated from each other in the left-right direction.

  Outer portions of the base surface portion 30 of the support plate 18 in the left-right direction of the bearing pressing pieces 32, 32 are provided as light shielding portions 30c, 30c, respectively, and the light shielding portions 30c, 30c are spaced apart from each other in the left-right direction.

  The support plate 18 is provided with shaft mounting pieces 33 and 33 protruding forward at respective positions outside the bearing pressing pieces 32 and 32 in the left-right direction.

  The attachment surface portion 31 protrudes forward from the lower opening edge of the light transmission hole 30a. A support shaft 34 that protrudes downward is provided at one end of the mounting surface portion 31 in the left-right direction.

  The rotating shaft 19 is fixed to the support plate 18 so as to extend left and right. The rotating shaft 19 is inserted into bearings 29 and 29 attached to the movable shade 17, and the portions near the left and right ends are inserted into the shaft attachment pieces 33 and 33 from above, and the shaft attachment pieces 33 and 33 are bent and caulked. Is fixed on the front side of the support plate 18.

  In a state where the rotating shaft 19 is fixed to the support plate 18, the movable shade 17 has a light amount control unit 23 inserted through the light transmission hole 30 a and positioned on the rear side of the support plate 18, and a portion positioned on the lower side. It is located in the front side of the support plate 18 (refer FIG.3 and FIG.4). Therefore, the upper part including the upper end of the movable shade 17 is positioned on the rear side of the rotating shaft 19, and the lower part including the lower end is positioned on the front side of the rotating shaft 19. The bearings 29 and 29 are in a state in which the large-diameter portions 29 a and 29 a are in contact with the bearing pressing pieces 32 and 32 of the support plate 18 from the inside, respectively, and the movement of the movable shade 17 in the left-right direction with respect to the rotating shaft 19 is restricted.

  The movable shade 17 is rotatable with respect to the support plate 18 with the rotation shaft 19 as a fulcrum by fixing the rotation shaft 19 to the support plate 18, and blocks a part of the light emitted from the light source 14. It is rotated between the first position (see FIG. 3) and the second position (see FIG. 4) where the shielding amount is smaller than the first position. The first position is the position of the low beam that irradiates a short distance, and the restricting projections 24, 24 of the movable shade 17 are in contact with the rear surface of the base surface portion 30 of the support plate 18, and the second position is a long distance. It is the position of the high beam to be irradiated, and the restricting projections 24 and 24 of the movable shade 17 are separated from the base surface portion 30 of the support plate 18 rearward.

  A biasing spring 35, which is a torsion coil spring, is supported on the rotating shaft 19 in an outer fitting manner, and both ends of the biasing spring 35 are engaged with the rear surface of the movable shade 17 and the support plate 18, respectively. Accordingly, the movable shade 17 is urged by the urging spring 35 in the direction in which the movable shade 17 is rotated from the second position toward the first position. The movable shade 17 is held in the first position by the restricting protrusions 24, 24 being pressed against the rear surface of the base surface portion 30 by the urging force of the urging spring 35.

  The link member 20 has a substantially triangular base portion 36 and a flat sliding engagement portion 37 protruding laterally from the base portion 36 (see FIG. 2). The base portion 36 is provided with a connecting shaft portion 36a protruding downward at the front end portion, and a supported hole 36b penetrating vertically is formed at the rear end portion.

  The link member 20 has a support shaft 34 inserted into the supported hole 36b, a retaining ring 38 is attached to the lower end of the support shaft 34, and is supported rotatably on the support plate 18 with the support shaft 34 as a fulcrum. In a state where the link member 20 is supported by the support plate 18, a part of the link member 20 is inserted through the arrangement hole 30 b and the sliding engagement portion 37 is in contact with the protrusion 28 of the movable shade 17.

  The solenoid 21 functions as an actuator that rotates the movable shade 17, and includes a yoke case 39, a coil body 40 disposed inside the yoke case 39, and an output shaft 41 that is movable in the left-right direction.

  The yoke case 39 is formed in a frame shape penetrating in the front and rear directions.

  The coil body 40 has an axial direction left and right, and a drive current is supplied to the coil body 40 from a power supply circuit (not shown).

  The output shaft 41 has an axial direction left and right, and a part of the output shaft 41 protrudes laterally from the yoke case 39. An annular coupling groove 41 a is formed in a portion near the tip of the output shaft 41. The output shaft 41 is moved in the axial direction according to the supply state of the drive current to the coil body 40.

  The yoke case 39 has an upper surface portion 38a attached to the attachment surface portion 31 of the support plate 18 by screws or the like. In a state where the upper surface portion 38a is attached to the attachment surface portion 31, a part of the solenoid 21 is arranged in the arrangement hole 30b.

  The solenoid 21 is connected to the connecting groove 41 a of the output shaft 41 by inserting the connecting shaft portion 36 a of the link member 20. Therefore, when the output shaft 41 is moved in the axial direction according to the supply state of the drive current to the coil body 40, the link member 20 is rotated with the support shaft 34 as a fulcrum, and the sliding engagement portion 37 of the protrusion 28. The movable shade 17 is rotated with the rotation shaft 19 as a fulcrum according to the contact position.

  The cover body 22 is attached to the front side of the support plate 18 by screws or the like. By attaching the cover body 22 to the support plate 18, the solenoid 21 is covered with the cover body 22.

  The lamp unit 7 is tiltably supported by the lamp housing 2 through an aiming adjusting mechanism (not shown). Accordingly, the lamp unit 7 is tilted vertically or horizontally by the operation of the aiming adjustment mechanism, and the optical axis of the light source 14 is adjusted (initial adjustment).

  The lamp unit 7 may be supported by the lamp housing 2 so as to be tiltable in the vertical direction, for example. When the lamp unit 7 is supported by the lamp housing 2 so as to be tiltable in the vertical direction, a leveling adjustment mechanism (not shown) is connected to the lamp unit 7, and the lamp unit 7 is tilted in the vertical direction by the operation of the leveling adjustment mechanism. The direction of the optical axis of the light source 14 is adjusted according to the weight of the vehicle-mounted object.

  Furthermore, the lamp unit 7 may be rotatable in the horizontal direction, for example. When the lamp unit 7 is rotatable in the horizontal direction, a swivel mechanism (not shown) is connected to the lamp unit 7, and the lamp unit 7 is rotated in the horizontal direction by the operation of the swivel mechanism. The direction of the optical axis is changed following this.

  In the vehicle headlamp 1 configured as described above, when the drive current is not supplied to the coil body 40 of the solenoid 21, the movable shade 17 urged by the urging spring 35 is the regulating protrusion. 24 and 24 are pressed against the base surface portion 30 of the support plate 18 and held in the first position (see FIGS. 3 and 5). At this time, the output shaft 41 of the solenoid 21 is positioned at the moving end in the direction protruding from the yoke case 39.

  The link member 20 is at the first rotation end where the sliding engagement portion 37 is located on the front side, and the surface 28 a of the projection 28 provided on the sliding portion 27 of the movable shade 17 and the sliding engagement portion 37. Are in contact with each other (see FIGS. 5 and 6).

  When light is emitted from the light source 14 in a state where the movable shade 17 is in the first position, a part of the light is shielded by the movable shade 17, and the unshielded light is incident on the projection lens 9, and the projection lens 9 The light is projected by 9 and a light distribution pattern of a low beam that irradiates a short distance is formed.

  When the coil body 40 of the solenoid 21 is energized, the output shaft 41 is moved in the direction of being pulled into the yoke case 39, and the link member 20 is rotated with the support shaft 34 as a fulcrum. When the link member 20 is rotated, the protrusion 28 of the movable shade 17 and the sliding engagement portion 37 of the link member 20 are slid, and the movable shade 17 is biased by the biasing spring 35 with the pivot shaft 19 as a fulcrum. On the contrary, it is rotated from the first position to the second position (see FIGS. 4, 7, and 8).

  By rotating the movable shade 17 to the second position, the shielding amount of the light emitted from the light source 14 is reduced, and a high beam light distribution pattern for irradiating a long distance is formed.

  When the energization of the coil body 40 is stopped, the movable shade 17 is rotated from the second position to the first position with the rotation shaft 19 as a fulcrum by the urging force of the urging spring 35, and the movable shade 17 is rotated. Accordingly, the link member 20 is rotated and moved to the moving end in the direction in which the output shaft 41 protrudes from the yoke case 39 (see FIGS. 3, 5 and 6).

  A part of the light transmitted through the light transmitting hole 30a of the support plate 18 is passed through the front surface side of the inclined surface portion 25. The inclined surface portion 25 is formed with a recess 25a, and the inclined surface portion is formed by the recessed portion 25a. Unnecessary reflection and shielding by the movable shade 17 of the light passing through the front side of the 25 is prevented.

  Further, when light is emitted from the light source 14 in a state where the movable shade 17 is rotated to the second position, the lower end portion of the movable shade 17 is moved upward from the first position. It will be in the state where light easily passes below. At this time, if light passes forward from the left and right ends on the lower side of the movable shade 17, the light distribution pattern is affected. However, the light shielding portions 30c are provided on the left and right ends on the rear side of the inclined surface portion 25 of the movable shade 17. , 30c are located, and light is shielded by the light shielding portions 30c, 30c. Accordingly, it is possible to prevent the light distribution pattern from being affected by the light passing under the movable shade 17.

  As described above, in the vehicle headlamp 1, the protrusion 28 having the curved surface 28a is provided on the sliding portion 27 of the movable shade 17, and the surface 28a of the protrusion 28 is the link member. The movable shade 17 is rotated by being slid by the 20 sliding engagement portions 37.

  Therefore, high slidability between the movable shade 17 and the link member 20 can be ensured to improve the operation efficiency, and the solenoid 21 can be downsized and the manufacturing cost of the vehicle headlamp 1 can be reduced. Can do.

  Further, by reducing the size of the solenoid 21, it becomes possible to reduce the biasing spring 35 that biases the movable shade 17 in accordance with the driving force of the solenoid 21, and the vehicle heading due to the cost reduction of the biasing spring 35 is achieved. The manufacturing cost of the lamp 1 can be reduced.

  Further, when the entire movable shade 17 is located on the front side or the rear side of the support plate 18, the light transmission hole 30 a of the support plate 18 is made large in order to secure a rotation space at the upper end portion or the lower end portion of the movable shade 17. Need to do.

  However, in the vehicle headlamp 1, since the upper and lower ends of the movable shade 17 are moved before and after the support plate 18 is sandwiched when the movable shade 17 is rotated, the movable shade 17 is moved to the support plate 18. It is not necessary to form a space for securing the rotation space between the upper end portion and the lower end portion, and leakage of light emitted from the light source 14 to the front side from the support plate 18 can be suppressed.

  In addition, although the example which provided the protrusion 28 in the sliding part 27 of the movable shade 17 was shown above, a protrusion may be provided in the sliding engagement part of a link member conversely.

  Further, in order to improve the slidability of the protrusion 28 and the sliding engagement portion 37, the protrusion 28 and the sliding engagement portion 37 are integrated with or separated from the movable shade 17 or the link member 20 by a material having high slidability. It can also be formed.

  Furthermore, since the vehicle headlamp 1 is configured such that the output shaft 41 of the solenoid 21 is moved in the left-right direction, there is no need to form a moving space for the output shaft 41 in the front-rear direction. Accordingly, the vehicle headlamp 1 can be reduced in size in the front-rear direction.

  Furthermore, since the projection 28 has a spherical surface 28a, the contact area between the projection 28 and the sliding engagement portion 37 is small during sliding, and high operating efficiency due to high slidability can be ensured. .

  In addition, since the sliding engagement portion 37 is flat, the protrusion 28 is brought into point contact with the sliding engagement portion 37, so that a higher slidability can be secured.

  Further, as described above, in the vehicle headlamp 1, the movable shade 17 has an upper portion including the upper end portion positioned on the rear side of the rotating shaft 19 and a lower portion including the lower end portion rotating. It is located on the front side of the moving shaft 19.

  Accordingly, a good weight balance of the movable shade 17 is secured, and a small solenoid with a small driving force can be used as the solenoid 21 for rotating the movable shade 17, so that the vehicle headlamp 1 can be miniaturized. Can be planned.

  In the above example, the upper portion including the upper end portion of the movable shade 17 is positioned on the rear side of the rotating shaft 19, and the lower portion including the lower end portion is positioned on the front side of the rotating shaft 19. On the contrary, the lower portion including the lower end portion of the movable shade 17 is positioned on the rear side of the rotating shaft 19 and the upper portion including the upper end portion is positioned on the front side of the rotating shaft 19. It is also possible to configure.

  However, by configuring the upper part including the upper end part of the movable shade 17 to be located on the rear side of the rotating shaft 19 and the lower part including the lower end part to be located on the front side of the rotating shaft 19, The lower end portion of the movable shade 17 does not come into contact with a part of the light source unit 11 located on the rear side of the light amount control unit 23, and the space can be effectively used and the design can be facilitated.

  In the vehicle headlamp 1, the urging spring 35 that urges the movable shade 17 toward the first position is located on the rear side of the movable shade 17. The light transmitted through the transmission hole 30a is not reflected and shielded by the urging spring 35 or the portions supporting the urging spring 35, and a good light distribution pattern can be formed.

  In the above, the vehicle headlamp 1 having the reflector 10 is shown as an example. However, the present invention can also be applied to a so-called direct-type vehicle headlamp having no reflector.

  The shapes and structures of the respective parts shown in the best mode for carrying out the invention described above are merely examples of the embodiments performed in practicing the present invention. The range should not be interpreted in a limited way.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle headlamp, 2 ... Lamp housing, 3 ... Cover, 4 ... Lamp housing, 7 ... Lamp unit, 11 ... Light source unit, 14 ... Light source, 17 ... Movable shade, 18 ... Support plate, 19 ... times Moving shaft, 21 ... Solenoid (actuator), 30c ... Shading part, 35 ... Biasing spring

Claims (2)

A vehicle headlamp in which a lamp unit is arranged inside a lamp outer casing formed by a lamp housing having an opening in at least one and a cover that covers the opening of the lamp housing,
The lamp unit is
A light source unit having a light source;
A rotatable movable shade that switches a shielding amount of light emitted from the light source;
An actuator for rotating the movable shade;
A rotation shaft that functions as a rotation fulcrum of the movable shade and whose axial direction is the left-right direction;
At least an upper end portion of the movable shade is positioned on the rear side of the rotating shaft, and at least a lower end portion of the movable shade is positioned on the front side of the rotating shaft;
A support plate for supporting the pivot shaft is provided;
A pair of light shielding portions are provided on the support plate to shield part of the light emitted from the light source,
The vehicular headlamp characterized in that the pair of light-shielding portions are spaced apart from each other on the rear side of the lower end portion of the movable shade . A biasing spring that biases the movable shade in one direction is provided,
The vehicle headlamp according to claim 1 , wherein the biasing spring is positioned on the rear side of the movable shade.

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