JP2014002963A - Headlight for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve miniaturization and simplification of a structure.SOLUTION: A headlight for a vehicle comprises: a light source unit 11 that has a light source 24; a light amount control mechanism 26 that has a movable shade 29 for switching the blocked amount of light emitted from the power source and an actuator 27 for operating the movable shade; a projection lens 9 that projects the light emitted from the power source; and a lens holder 8 that holds the projection lens. The light amount control mechanism is assembled to the lens holder.

Description

  The present invention relates to a vehicle headlamp. More specifically, the present invention relates to a technical field in which a light amount control mechanism having a movable shade that switches a shielding amount of light emitted from a light source and an actuator that operates the movable shade is assembled to a lens holder to reduce the size and simplify the structure.

  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.

  Some lamp units of vehicle headlamps are provided with a light amount control mechanism that controls the amount of light emitted from a light source (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

  The light quantity control mechanism has a movable shade that changes the shielding amount of the light quantity emitted from the light source and an actuator that operates the movable shade. In the vehicle headlamp described in Patent Documents 1 to 3, for example, the movable shade is switched to the low beam irradiation mode for irradiating a short distance by rotating to the first position. The movable shade is turned to the second position to switch to the high beam irradiation mode for irradiating a long distance.

  The movable shade and the actuator of the light quantity control mechanism are supported or attached to different members such as a connecting plate, a fixed arm, a light source unit, and a lens holder.

JP 2011-65960 A JP2011-119184A JP 2010-3589 A

  However, in the vehicle headlamps described in Patent Documents 1 to 3, as described above, the movable shade and the actuator of the light quantity control mechanism are supported or attached to different members.

  Accordingly, the number of parts is increased and the arrangement space of each member is increased, and there is a problem that the downsizing of the vehicle headlamp is hindered and the simplification of the structure is hindered.

  Therefore, an object of the vehicle headlamp of the present invention is to overcome the above-described problems and to reduce the size and the structure.

  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 light amount control mechanism having a movable shade for switching a shielding amount of light emitted from the light source, and an actuator for operating the movable shade, and light emitted from the light source. And a lens holder that holds the projection lens, and the light quantity control mechanism is assembled to the lens holder.

  Therefore, in the vehicle headlamp, both the movable shade and the actuator of the light quantity control mechanism are assembled to the lens holder.

  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 light amount control mechanism having a movable shade for switching a shielding amount of light emitted from the light source, and an actuator for operating the movable shade, and the light source emitted from the light source. A projection lens that projects the light and a lens holder that holds the projection lens, and the light quantity control mechanism is assembled to the lens holder.

  Therefore, there is no need for dedicated members for assembling the actuator and the movable shade of the light quantity control mechanism, and accordingly, the vehicle headlamp can be reduced in size and simplified in structure.

  According to the second aspect of the present invention, an assembly opening opened forward is formed in the lens holder, and the light amount control mechanism is inserted from the assembly opening and assembled to the lens holder from the front. It has been.

  Therefore, the assembly of the light quantity control mechanism to the lens holder can be improved, and the manufacturing cost can be reduced by improving the workability in the assembly work.

  According to a third aspect of the present invention, an assembly opening that is opened upward is formed in the lens holder, and the light amount control mechanism is inserted from the assembly opening and assembled to the lens holder from above. It has been.

  Therefore, the assembly of the light quantity control mechanism to the lens holder can be improved, and the manufacturing cost can be reduced by improving the workability in the assembly work.

  In the invention described in claim 4, the light source unit is assembled to the lens holder.

  Therefore, there is no need to provide a dedicated member for assembling the light source unit, and the vehicle headlamp can be further reduced in size and structure.

  The best mode for carrying out the vehicle headlamp of the present invention will be described below with reference to the accompanying drawings.

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

  As shown in FIG. 1, the vehicle headlamp 1 includes a lamp housing 2 having a recess opened forward and a cover 3 that closes the opening of the lamp housing 2. 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 (see FIGS. 1 and 2). The lamp unit 7 is attached to 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 of the light source unit 11. And a cooling fan 12.

  The lens holder 8 includes an arc-shaped lens mounting portion 13 penetrating in the front-rear direction, and holding portions provided between the side portions 14 and 14 and the side portions 14 and 14 protruding rearward from the left and right end portions of the lens mounting portion 13, respectively. 15 (see FIGS. 2 and 3). The lens holder 8 is formed with an assembly opening 8 a that opens forward and communicates with the holding portion 15. The assembly opening 8 a is a portion (region) including a space inside the lens mounting portion 13 in the lens holder 8.

  The lens mounting portion 13 is formed in an arc shape opened downward.

  The side parts 14 and 14 are formed in the plate shape which faces the substantially left-right direction.

  The holding portion 15 includes a mounting surface portion 16 facing in the vertical direction, bearing portions 17 and 17 provided on the front end portion of the mounting surface portion 16 so as to be separated from each other on the left and right sides, an actuator mounting portion 18 and a mounting surface portion 16 provided on the front side of the mounting surface portion 16. There are coupling projections 19 and 19 projecting downward from the left and right end portions of each.

  The bearing portion 17 projects upward and obliquely forward from the mounting surface portion 16. An insertion groove 17a opened forward is formed in the bearing portion 17, and a part of the insertion groove 17a is formed as a bearing recess 17b having a width wider than other portions. The bearing portion 17 can be elastically deformed in a direction in which upper and lower portions of the insertion groove 17a are separated from each other.

  The actuator mounting portion 18 protrudes forward from the receiving surface portion 20 that faces in the front-rear direction and the support protrusions 21 and 21 that protrude forward from each of the outer peripheral portions of the receiving surface portion 20 and the upper end portion of the receiving surface portion 20. An engagement protrusion 22 is provided. Positioning holes 20a, 20a, 20a are formed in the receiving surface portion 20. The support protrusions 21 and 21 are spaced apart from each other on the left and right. The engagement protrusion 22 has a locking claw 22a protruding downward at the front end, and is elastically deformable in the vertical direction.

  The projection lens 9 is formed in a substantially hemispherical shape and is attached to the lens attachment portion 13 of the lens holder 8 (see FIGS. 1 and 2).

  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 23 and a light source 24 mounted on the upper surface of the circuit board 23. As the light source 24, for example, a light emitting diode (LED) is used.

  The light source unit 11 is provided with attached pieces 11a and 11a protruding sideward (outward). The light source unit 11 is attached to the lens holder 8 by attaching the attached pieces 11a and 11a to the connecting protrusions 19 and 19 by screws or the like.

  The light source unit 11 is provided with a heat sink 25 positioned below the circuit board 23.

  The cooling fan 12 is attached to the lower surface of the heat sink 25.

  The lens holder 8 is assembled with a light amount control mechanism 26 from the front (see FIGS. 1, 2 and 4).

  The light quantity control mechanism 26 includes an actuator 27, a transmission body 28, and a movable shade 29.

  The actuator 27 has a yoke case 30, a coil body 31 disposed inside the yoke case 30, and an output shaft 32 that is movable in the left-right direction.

  The yoke case 30 is in a horizontally long state, the coil body 31 has an axial direction in the left-right direction, and the output shaft 32 has an axial direction in the left-right direction, and part of the output shaft 32 protrudes laterally from the yoke case 30. The yoke case 30 is provided with positioning protrusions 30a, 30a, 30a protruding rearward.

  The transmission body 28 is connected to the end of the output shaft 32 that protrudes laterally from the yoke case 30. The transmission body 28 includes a supported portion 33, a connecting portion 34 projecting downward from one side of the supported portion 33, and a drive shaft 35 supported by the supported portion 33.

  The supported portion 33 is provided with a shaft support portion 33a that extends in the front-rear direction and bearing portions 33b and 33b that are spaced apart in the left-right direction and protrude rearward. The supported portion 33 is provided with a spring engaging projection 33c on one side surface. In the transmission body 28, the lower end portion of the connecting portion 34 is connected to the output shaft 32.

  The drive shaft 35 is formed in a round shaft shape extending in the front-rear direction, and is rotatably supported by the shaft support portion 33 a of the supported portion 33.

  The movable shade 29 has a light amount control unit 29a formed in a substantially arcuate surface shape, and connecting arm portions 29b and 29b protruding substantially downward from positions near the left and right ends of the light amount control unit 29a (FIG. 5). And FIG. 6).

  The movable shade 29 is provided with a driven portion 36, and the driven portion 36 protrudes downward from the light amount control portion 29a and is positioned between the connecting arm portions 29b and 29b. A first sliding surface 37 and a second sliding surface 38 are formed at the lower end of the driven portion 36 so as to be separated from each other in the front-rear direction, and between the first sliding surface 37 and the second sliding surface 38. Is formed with a receiving recess 36a opened substantially downward.

  The first sliding surface 37 has a flat first formed restricted surface 37a and a torsion surface 37b and a twisted surface that are displaced downward while being twisted sideways from the first restricted surface 37a. It consists of a planar second position-regulating surface 37c located on the opposite side of the first position-regulating surface 37a across the 37b.

  The second sliding surface 38 has a first surface-restricted surface 38a formed in a planar shape, and a twisted surface 38b and a twisted surface that are displaced upward while being twisted sideways from the first position-restricted surface 38a. And a planar second position restricting surface 38c located on the opposite side of the first position restricting surface 38a with 38b interposed therebetween.

  The first position restricting surface 38 a of the second sliding surface 38 is positioned directly behind the second position restricting surface 37 c of the first sliding surface 37, and the second position of the second sliding surface 38 is the second. The position-restricted surface 38 c is positioned immediately behind the first position-restricted surface 37 a of the first sliding surface 37.

  A rotating shaft 39 extending in the left-right direction is connected to the connecting arm portions 29 b and 29 b of the movable shade 29. In a state where the movable shade 29 is connected to the rotation shaft 39, the rotation shaft 39 is inserted into the receiving recess 36 a, and the first sliding surface 37 and the second sliding surface 38 are the drive shaft 35 of the transmission body 28. It touches from above.

  The movable shade 29 is rotated about a rotation shaft 39 as a fulcrum between a first position where a part of the light emitted from the light source 24 is shielded and a second position where the shielding amount is smaller than the first position. The The first position is the position of the low beam that irradiates a short distance, and the light amount control unit 29a of the movable shade 29 is in a substantially vertical state, and the second position is the position of the high beam that irradiates a long distance, The light quantity control unit 29a is inclined.

  For example, an urging spring 40 that is a compression coil spring is supported on the rotation shaft 39 in an outer fitting manner.

  In a state before the projection lens 9 is attached to the lens holder 8, the light quantity control mechanism 26 is inserted from the front into the assembly opening 8a and assembled to the lens holder 8 as follows.

  A rotation shaft 39 is assembled to the bearing portions 17 and 17 of the holding portion 15 in a state where the movable shade 29 is connected. The rotating shaft 39 is inserted into the insertion grooves 17a and 17a at the portions near both ends, and at this time, the upper and lower portions of the insertion grooves 17a and 17a of the bearing portions 17 and 17 are elastically deformed in a direction away from each other. When the rotation shaft 39 is inserted up to the bearing recesses 17a and 17a, the bearing portions 17 and 17 are elastically restored, the rotation shaft 39 is supported by the bearing recesses 17a and 17a, and the rotation shaft 39 is attached to the bearing portions 17 and 17 Assembled.

  In addition, the actuator 27 is positioned by inserting the positioning protrusions 30a, 30a, 30a into the positioning holes 20a, 20a, 20a of the receiving surface portion 20 in a state where the transmission body 28 is connected to the output shaft 32, respectively. Attached by caulking or the like. At this time, the upper surface of the yoke case 30 is slid by the locking claw 22a of the engaging protrusion 22 and elastically deformed so that the engaging protrusion 22 bends upward, and the front end of the yoke case 30 matches the locking claw 22a. At this point, the engaging projection 22 is elastically restored, the locking claw 22 a is locked to the front edge of the yoke case 30, and the actuator 27 is assembled to the actuator mounting portion 18.

  In a state where the actuator 27 is assembled to the actuator mounting portion 18, the rotation shaft 39 is inserted into the bearing portions 33 b and 33 b of the transmission body 28, and the transmission body 28 and the rotation shaft 39 are connected. The transmission body 28 is movable in the axial direction of the rotation shaft 39.

  Further, one end of the biasing spring 40 is engaged with the lower surface of the light amount control unit 29 a of the movable shade 29, and the other end is engaged with a spring engaging protrusion 33 c provided on the supported portion 33 of the transmission body 28. The Accordingly, the movable shade 29 is urged by the urging spring 40 in the direction in which the movable shade 29 is rotated from the second position toward the first position.

  In a state where the rotation shaft 39 is inserted into the bearing portions 33 b and 33 b of the transmission body 28, both end portions of the urging spring 40 are respectively connected to one connecting arm portion 29 b of the movable shade 29 and one bearing portion of the transmission body 28. 33b is compressed. Therefore, the output shaft 32 of the actuator 27 is urged by the urging spring 40 via the transmission body 28 in the direction in which the output shaft 32 protrudes from the yoke case 30.

  In the movable shade 29, the first sliding surface 37 and the second sliding surface 38 are in contact with the drive shaft 35 of the transmission body 28 from above. At this time, in a state in which the movable shade 29 is rotated to the first position, the first position-regulating surface 37a of the first sliding surface 37 and the second of the second sliding surface 38 on the drive shaft 35. The position-regulating surface 38c comes into contact. In the state where the movable shade 29 is rotated to the second position, the second position-regulating surface 37 c of the first sliding surface 37 and the second sliding surface 38 of the second sliding surface 38 are applied to the drive shaft 35. The position-regulating surface 38a contacts.

  The lamp unit 7 is tiltably supported by the lamp housing 2 through an aiming adjusting mechanism (not shown). Therefore, the lamp unit 7 is tilted in the vertical direction or the horizontal direction by the operation of the aiming adjustment mechanism, and the optical axis adjustment (initial adjustment) of the light source 24 is performed.

  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 24 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, the output shaft 32 protrudes from the yoke case 30 by the biasing force of the biasing spring 40 in a state where no drive current is supplied to the coil body 31 of the actuator 27. It is located at the moving end in the direction. At this time, the movable shade 29 is not applied with turning force in the direction from the first position to the second position, the transmitting body 28 is positioned at the left moving end, and the movable shade 29 is energized. The first position restricting surface 37a of the first sliding surface 37 is pressed from above onto the drive shaft 35 of the transmission body 28 by the spring 40 and is held in the first position (see FIG. 5). In the first position, the second position restricting surface 38 c of the second sliding surface 38 is in contact with the drive shaft 35.

  When light is emitted from the light source 24 in a state where the movable shade 29 is in the first position, a part of the light is shielded by the movable shade 29, 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 31 of the actuator 27 is energized, the output shaft 32 is moved in the direction in which it is drawn into the yoke case 30, and the transmission body 28 is moved to the right along with the movement of the output shaft 32. When the transmission body 28 is moved rightward, the drive shaft 35 is slid on the first sliding surface 37 from the twisted surface 37b to the second position-regulating surface 37c, and the movable shade 29 is moved from the first position to the first position. It is rotated to position 2 (see FIG. 6). At this time, the drive shaft 35 is slid on the twisted surface 38b of the second sliding surface 38 and the first position-regulating surface 38a. The movable shade 29 is held in the second position by pressing the second position restricting surface 37c of the first sliding surface 37 against the drive shaft 35 from above by the biasing spring 40.

  By rotating the movable shade 29 to the second position, the shielding amount of the light emitted from the light source 24 is reduced, and a high beam light distribution pattern for irradiating a long distance is formed.

  When energization of the coil body 31 is stopped, the output shaft 32 is moved in a direction protruding from the yoke case 30 by the biasing force of the biasing spring 40, and the transmission body 28 is moved to the left along with the movement of the output shaft 32. Moved. When the transmission body 28 is moved to the left, the drive shaft 35 is slid on the first sliding surface 37 from the twisted surface 37b to the first position restricting surface 37a, and the movable shade 29 is moved from the second position to the first position. It is rotated to position 1 (see FIG. 5). At this time, the drive shaft 35 is slid on the twisted surface 38b of the second sliding surface 38 and the second position restricting surface 38c. The movable shade 29 is held again at the first position by pressing the first position restricting surface 37 a of the first sliding surface 37 against the drive shaft 35 from above by the biasing spring 40.

  As described above, in the vehicular headlamp 1 having the lens holder 8, the lens holder 8 is formed with the assembly opening 8a opened forward, and the light quantity control mechanism 26 is connected to the assembly opening 8a. Inserted and assembled to the lens holder 8 from the front.

  Accordingly, the light quantity control mechanism 26 is assembled to the lens holder 8 from one direction, the assembling property of the light quantity control mechanism 26 to the lens holder 8 is improved, and the manufacturing cost is reduced by improving the workability in the assembling work. be able to.

  Further, the movable shade 29 is rotated about a rotation shaft 39 extending in the left-right direction, and has an insertion groove 17a, 17a into which the rotation shaft 39 is inserted. Are provided with elastically deformable bearings 17 and 17 for supporting the bearings.

  Therefore, since the rotation shaft 39 is inserted into the insertion grooves 17a and 17a and elastically deformed to be supported by the bearing portions 17 and 17, the assembly of the rotation shaft 39 to the lens holder 8 is improved. The manufacturing cost can be further reduced by improving workability in the assembling work.

  Below, the modification of a lens holder and a light quantity control mechanism is demonstrated (refer FIG.7 and FIG.8).

  The lens holder 8 </ b> A according to the modification is provided between a side part 44, 44 and a side part 44, 44 that protrudes rearward from the left and right ends of the lens attachment part 43, and a circular lens attachment part 43 that penetrates forward and backward. The holding part 45 is provided. The lens holder 8 </ b> A is formed with an assembly opening 8 b that opens upward and communicates with the holding portion 45. The assembly opening 8b is a portion (region) including a space behind the lens mounting portion 43 in the lens holder 8A.

  Each of the side portions 44 and 44 is formed in a plate shape facing substantially the left-right direction.

  The holding portion 45 includes a mounting surface portion 46 facing in the vertical direction, bearing portions 47 and 47 provided on the front end portion of the mounting surface portion 46 so as to be laterally separated from each other, an actuator mounting portion 48 provided on the front end side of the mounting surface portion 46, and a mounting surface portion. 46, projections 49 and 49 for coupling projecting downward from the left and right ends of 46, respectively.

  A spring support protrusion 46 a is provided on the upper surface of the attachment surface portion 46.

  The bearing portion 47 protrudes upward from the mounting surface portion 46. An insertion groove 47a that is open upward is formed in the bearing portion 47, and a part of the insertion groove 47a is formed as a bearing recess 47b that is wider than other portions. The bearing portion 47 can be elastically deformed in a direction in which the front and rear portions of the insertion groove 47a are separated from each other.

  The actuator mounting portion 48 includes a receiving surface portion 50 facing in the front-rear direction, a supporting protrusion 51 protruding forward from the lower end portion of the receiving surface portion 50, and an engaging protrusion protruding upward from the left and right ends of the supporting protrusion 51. 52 and 52 are provided. Positioning holes 51a, 51a, 51a are formed in the support protrusion 51. The engaging protrusions 52, 52 have locking claws 52a, 52a protruding in a direction approaching each other at the upper end, and can be elastically deformed in the left-right direction.

  The light source unit 11 is attached to the lens holder 8A by attaching the attached pieces 11a and 11a to the connecting protrusions 49 and 49 by screws or the like.

  A light amount control mechanism 56 is assembled to the lens holder 8A from above.

  The light quantity control mechanism 56 includes an actuator 57, a transmission member 58, and a movable shade 59.

  The actuator 57 has a yoke case 60, a coil body 61 disposed inside the yoke case 60, and an output shaft 62 that is movable in the front-rear direction.

  The coil body 61 has an axial direction in the front-rear direction, and the output shaft 62 has an axial direction in the front-rear direction, and a part projects forward from the yoke case 60. The yoke case 60 is provided with positioning protrusions 60a, 60a, 60a protruding downward.

  The transmission member 58 is, for example, a wire-like member, and one end thereof is connected to the end of the output shaft 62 on the side protruding forward from the yoke case 60.

  The movable shade 59 is formed in a substantially arcuate surface shape in the left-right direction of the light amount control unit 59a and the connection arm portions 59b, 59b and the light amount control unit 59a projecting substantially downward from the positions near the left and right ends of the light amount control unit 59a. And a connecting protrusion 59c protruding substantially downward from the substantially central portion. The other end of the transmission member 58 is connected to the connecting protrusion 59 c of the movable shade 59.

  A rotating shaft 63 extending in the left-right direction is connected to the connecting arm portions 59b, 59b of the movable shade 59.

  The movable shade 59 is rotated around the rotation shaft 63 as a fulcrum between a first position where a part of the light emitted from the light source 24 is blocked and a second position where the shielding amount is smaller than the first position. The The first position is the position of the low beam that irradiates a short distance, and the light amount control unit 59a of the movable shade 59 is in a substantially vertical state, and the second position is the position of the high beam that irradiates a long distance, The light quantity control unit 59a is tilted.

  For example, an urging spring 64 that is a coil spring is supported on the rotating shaft 63 in an outer fitting manner.

  The light quantity control mechanism 56 is inserted into the assembly opening 8b from above and assembled to the lens holder 8A as follows.

  The rotating shaft 63 is assembled to the bearing portions 47 and 47 of the holding portion 45 in a state where the movable shade 59 is connected. The rotation shaft 63 is inserted into the insertion grooves 47a and 47a at the portions near both ends, and at this time, the front and rear portions of the insertion grooves 47a and 47a of the bearing portions 47 and 47 are elastically deformed in a direction away from each other. When the rotation shaft 63 is inserted up to the bearing recesses 47a and 47a, the bearing portions 47 and 47 are elastically restored, the rotation shaft 63 is supported by the bearing recesses 47a and 47a, and the rotation shaft 63 is moved to the bearing portions 47 and 47. Assembled.

  Further, the actuator 57 is positioned with the positioning protrusions 60 a, 60 a, 60 a inserted into the positioning holes 51 a, 51 a, 51 a of the support protrusion 51 in a state where the transmission member 58 is connected to the output shaft 62. It is attached to the part 51 by caulking or the like. At this time, both side surfaces of the yoke case 60 are slid by the engaging claws 52a and 52a of the engaging protrusions 52 and 52, respectively, and elastically deformed so that the engaging protrusions 52 and 52 are bent sideways. When the upper end of 60 is aligned with the engaging claws 52a and 52a, the engaging projections 52 and 52 are elastically restored, and the engaging claws 52a and 52a are respectively engaged with the upper edges of the yoke case 60 and the actuator 57 is moved. It is assembled to the actuator mounting portion 48.

  In a state where the actuator 57 is assembled to the actuator mounting portion 48, the other end of the transmission member 58 is connected to the connecting projection 59c, and the transmission member 58 and the movable shade 59 are connected.

  Further, one end of the biasing spring 64 is engaged with the lower surface of the light quantity control unit 59a of the movable shade 59, and the other end is engaged with a spring support protrusion 46a provided on the mounting surface 46 of the lens holder 8A. Accordingly, the movable shade 59 is urged by the urging spring 64 in a direction in which the movable shade 59 is rotated from the second position toward the first position.

  In a state where the transmission member 58 is connected to the movable shade 59, the movable shade 59 is urged by the urging spring 64 in the direction in which the movable shade 59 is rotated from the second position toward the first position. The urging force of the urging spring 64 is transmitted to the output shaft 62 of the actuator 57 via the transmission member 58, and is urged in the direction in which the output shaft 62 protrudes from the yoke case 60.

  In the vehicular headlamp 1 having the lens holder 8A and the light amount control mechanism 56 configured as described above, the output shaft 62 is biased by a biasing spring 64 in a state where no drive current is supplied to the coil body 61 of the actuator 57. It is located at the moving end in the direction protruding from the yoke case 60 by the urging force. At this time, the movable shade 59 is not applied with turning force in the direction from the first position toward the second position, and the movable shade 59 is held at the first position by the biasing spring 64.

  When light is emitted from the light source 24 in a state where the movable shade 59 is in the first position, a part of the light is shielded by the movable shade 59, and the unshielded light enters 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 61 of the actuator 57 is energized, the output shaft 62 is moved in the direction in which it is drawn into the yoke case 60, and the transmission member 58 is moved rearward as the output shaft 62 moves. When the transmission member 58 is moved rearward, the movable shade 59 is rotated from the first position to the second position against the urging force of the urging spring 64.

  By rotating the movable shade 59 to the second position, the shielding amount of the light emitted from the light source 24 is reduced, and a high beam light distribution pattern for irradiating a long distance is formed.

  When the energization of the coil body 61 is stopped, the output shaft 62 is moved in a direction protruding from the yoke case 60 by the biasing force of the biasing spring 64, and the transmission member 58 moves forward as the output shaft 62 moves. Is done. When the transmission member 58 is moved forward, the movable shade 59 is rotated from the second position to the first position by the urging force of the urging spring 64 and is held again at the first position.

  As described above, in the vehicle headlamp 1 having the holder 8A and the light amount control mechanism 56, the assembly opening 8b opened upward is formed in the holder 8A, and the light amount control mechanism 56 is assembled. It is inserted from the attachment opening 8b and assembled to the holder 8A from above.

  Therefore, the light quantity control mechanism 56 is assembled to the holder 8A from one direction, the assembling property of the light quantity control mechanism 56 with respect to the holder 8A is improved, and the manufacturing cost is reduced by improving the workability in the assembling work. it can.

  Further, the movable shade 59 is rotated about a rotation shaft 63 extending in the left-right direction, and has an insertion groove 47a and 47a into which the rotation shaft 63 is inserted and opened upward in the holder 8A. Supporting elastically deformable bearing portions 47, 47 are provided.

  Accordingly, since the rotating shaft 63 is inserted into the insertion grooves 47a and 47a and elastically deformed to be supported by the bearing portions 47 and 47, the assembling property of the rotating shaft 63 with respect to the holder 8A is improved. The manufacturing cost can be further reduced by improving workability in the attaching work.

  As described above, in the vehicle headlamp 1, the movable shades 29 and 59 that switch the shielding amount of the light emitted from the light source 24 to the lens holders 8 and 8A and the actuators that operate the movable shades 29 and 59 are used. The light quantity control mechanisms 26 and 56 having 27 and 57 are assembled.

  Accordingly, there is no need for dedicated members for assembling the actuators 27 and 57 of the light quantity control mechanisms 26 and 56 and the movable shades 29 and 59, respectively, and accordingly, the vehicle headlamp 1 can be reduced in size and simplified in structure. Can be planned.

  Further, since the light source unit 11 having the light source 24 is assembled to the lens holders 8 and 8A, it is not necessary to provide a dedicated member for assembling the light source unit 11, and the vehicle headlamp 1 can be further reduced in size and structure. Simplification can be achieved.

  In the rotating shafts 39 and 63 described above, the diameters of the portions inserted into the bearing concave portions 17a, 17a, 47a, and 47a of the bearing portions 17, 17, 47, and 47 are made smaller than the diameters of the other portions. May be.

  As described above, the diameter of the portion inserted into the bearing concave portions 17a, 17a, 47a, 47a of the rotating shafts 39, 63 is made smaller than the diameter of the other portions, thereby assembling the bearing portions 17, 17, 47, 47. And the movement of the rotary shafts 39, 63 in the axial direction with respect to the bearing portions 17, 17, 47, 47 can be restricted.

  In the above description, 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.

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 lamp unit. It is a perspective view of a lens holder. It is a perspective view which shows the state by which the light quantity control mechanism was assembled | attached to the lens holder. It is an expansion perspective view which shows the state by which the movable shade is hold | maintained in the 1st position. It is an expansion perspective view which shows the state by which the movable shade is hold | maintained in the 2nd position. FIG. 8 shows a lens holder and a light quantity control mechanism according to a modified example together with FIG. 8, and this figure is a perspective view showing a state before the light quantity control mechanism is assembled to the lens holder. It is a perspective view which shows the state in which the light quantity control mechanism was assembled | attached to the lens holder.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle headlamp, 2 ... Lamp housing, 3 ... Cover, 4 ... Lamp outer casing, 7 ... Lamp unit, 8 ... Lens holder, 8a ... Assembly opening, 9 ... Projection lens, 11 ... Light source unit, 24 ... Light source, 26 ... Light quantity control mechanism, 27 ... Actuator, 29 ... Movable shade, 8A ... Lens holder, 8b ... Assembly opening, 56 ... Light quantity control mechanism, 57 ... Actuator, 59 ... Movable shade

Claims (4)

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 light amount control mechanism having a movable shade for switching a shielding amount of light emitted from the light source and an actuator for operating the movable shade;
A projection lens for projecting light emitted from the light source;
A lens holder for holding the projection lens,
The vehicle headlamp, wherein the light quantity control mechanism is assembled to the lens holder. An assembly opening opened forward is formed in the lens holder,
The vehicle headlamp according to claim 1, wherein the light quantity control mechanism is inserted from the assembly opening and assembled to the lens holder from the front. An assembly opening that is opened upward is formed in the lens holder,
The vehicle headlamp according to claim 1, wherein the light quantity control mechanism is inserted from the assembly opening and assembled to the lens holder from above. The vehicle headlamp according to claim 1, 2, or 3, wherein the light source unit is assembled to the lens holder.

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