JPH10188604A - Bulb mount structure for vehicule lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate attaching and removing a set spring to and from a socket fixture in a vehicule lamp having a rotary bulb fixing structure. SOLUTION: A set spring 20 is set in a socket fixture 18 holding a discharge bulb 12 and is rotationally installed, in which case the discharge bulb 12 is pressed from behind by the set spring 20 and secured to the socket fixture 18. This pressing is achieved by means of pressing parts 20C formed at the ends of three elastic arms 20B extending in the form of circles from a main body part 20A of the set spring 20 in the counterclockwise direction. Thus, rotation in the clockwise direction (mounting direction) can be achieved with a relatively small rotating force, whereas rotation in the counterclockwise direction (releasing direction) requires a relatively large rotating force, with the result that the set spring 20, once attached to the socket fixture 18, is not inadvertently disconnected to eliminate the need to firmly fix it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve fixing structure for a vehicular lamp, and more particularly to a rotation fixing type valve fixing structure.

[0002]

2. Description of the Related Art Generally, in a vehicular lamp such as a headlamp or a fog lamp, a bulb is held at a predetermined position in a bulb insertion hole formed at the rear top of the reflector. The operation is performed by a valve holder integrally formed with the reflector or by a valve holder attached to the reflector.

As a valve fixing device for fixing the valve held by the valve holding device to the valve holding device, a wire spring is conventionally used in many cases. Due to its structure, it is not easy to evenly press the valve at a plurality of locations, and therefore, the valve in the holding state is liable to cause a problem such as a rising inclination.

[0004] As the above-mentioned valve fixing device, a rotation fixing type is also used. This rotation-fixed valve fixture is mounted on the valve holder by rotation of the valve around the optical axis, and at the time of mounting, the valve is pressed from behind to fix it to the valve holder. It is configured to be. This rotation-fixed valve fixture has the feature that it is relatively easy to press the valve evenly at a plurality of locations.

[0005]

However, when such a rotation-fixed type valve fixing device is employed, there are the following problems.

That is, it is necessary to securely mount the valve holder on the valve holder so that the valve holder does not come off from the valve holder due to external force such as vehicle vibration. For this reason, the conventional rotation fixed type valve fixing device is relatively firmly attached to the valve holding device. However, in such a valve fixing structure, the valve holding device can be attached to and detached from the valve holding device. It is not easy to perform the work, and therefore, there is a problem that the workability of assembling the lamp and replacing the bulb are not very good.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and in a vehicle lamp provided with a rotation-fixed type bulb fixing structure, the work of attaching and detaching the bulb fixing fixture to and from the bulb holder can be easily performed. It is an object of the present invention to provide a structure for fixing a bulb in a vehicle lamp.

[0008]

According to the present invention, the above-mentioned object is achieved by devising a structure in which a valve fixing member abuts on a valve holding member.

That is, according to the present invention, as described in claim 1, a valve, a reflector having a valve insertion hole formed at a rear top portion, and a valve holding device for holding the valve at a predetermined position in the valve insertion hole. Fixture, and a valve fixture for fixing the valve to the valve holder, in a valve mounting structure for a vehicle lighting device, wherein the valve fixture is attached to the valve holder by rotation of the valve around an optical axis. It is configured to be mounted and to press the valve from the rear at the time of the mounting, and a plurality of pressing portions for pressing the valve on the valve fixture are provided at predetermined angular intervals around the optical axis. And each of the pressing portions is formed at a tip end of each of a plurality of elastic arms extending from the main body of the valve fixture in a direction opposite to a rotation direction at the time of mounting. And that, it is characterized in.

The specific shape of the "valve holder" is not particularly limited as long as it can hold the valve at a predetermined position in the valve insertion hole. Further, the “valve holder” may be formed integrally with the reflector, or may be attached to the reflector. In the latter case, the mounting structure is not particularly limited.

The "plurality of pressing portions" are formed at predetermined angular intervals around the optical axis. The angular intervals may be equal or unequal. When the valve fixture is rotated around the optical axis of the valve and attached to the valve holder, the valve can be pressed from the rear to fix the valve to the valve holder. Good.

The specific shape and the like of the "plurality of elastic arms" are not particularly limited as long as they extend from the main body of the valve fixture in the direction opposite to the rotation direction at the time of mounting. Not something.

[0013]

As described above, according to the present invention, in the present invention, the valve held at a predetermined position in the valve insertion hole of the reflector by the valve holder is held by the rotation-fixed valve fixture. A plurality of pressing portions for pressing the valve are formed at a predetermined angular interval around the optical axis of the valve, and each of the pressing portions is formed on the valve fixing device. The distal end of each of a plurality of elastic arms extending from the main body of the valve fixture in a direction (hereinafter, referred to as a “separating direction”) opposite to a rotation direction (hereinafter, referred to as a “mounting direction”) during the mounting. Since it is formed in the part, the rotating operation in the mounting direction can be performed with a relatively small rotating force, while the rotating operation in the detaching direction requires a relatively large rotating force.

This will be schematically described with reference to FIGS.

FIG. 15 shows a case of a rotating operation in the mounting direction, and FIG. 16 shows a case of a rotating operation in the detaching direction.

As shown in FIG. 15 (a), in the valve fixture 2, a pressing portion 2C at the distal end of an elastic arm portion 2B extending in a detaching direction from the main body portion 2A comes into contact with the valve holder 4 so as to come into contact with the valve holder 4. The valve holder 4 is being pressed by the load w. In this state, the pressing portion 2C only receives a vertical force N equal to the load w from the valve holder 4, but as shown in FIG. When trying to rotate, the frictional force μN acts in the direction opposite to the rotational force F (that is, the separating direction). Since the frictional force μN includes a component p that is orthogonally upward with respect to the direction in which the elastic arm 2B extends, as indicated by a broken line in the figure, the elastic arm 2B has a counterclockwise rotational moment M. Works. Due to the rotational moment M, the pressing portion 2C tends to float from the valve holder 4, and as shown in FIG. 15B, the pressing load acting on the valve holder 4 from the pressing portion 2C is: Actually, the load w 'is smaller than the load w, and accordingly, the vertical effect N and the frictional force μN are actually smaller than the vertical effect N' and the frictional force μN '. Therefore, the rotation force required to rotate the valve fixture 2 in the mounting direction is actually sufficient with a rotation force F ′ smaller than the rotation force F.

On the other hand, as shown in FIG. 16 (a), when the valve fixture 2 is to be rotated with the rotational force F in the detaching direction, the frictional force μN is opposite to the rotational force F (ie, in the mounting direction). Works. This frictional force μN includes a downward component p perpendicular to the direction in which the elastic arm portion 2B extends, as indicated by the broken line in the figure, so that a clockwise rotational moment M is applied to the elastic arm portion 2B. Works. Since the pressing portion 2C is strongly pressed against the valve holder 4 by the rotation moment M, as shown in FIG. 16B, the pressing load acting on the valve holder 4 from the pressing portion 2C is actually reduced. Becomes a load w 'which is larger than the load w, and accordingly, the vertical effect N and the frictional force μ
In practice, N also has a larger vertical effect N 'and frictional force μN'. Therefore, the rotational force required to rotate the valve fixture 2 in the detaching direction is actually
A rotation force F 'larger than the rotation force F is required.

As described above, in the present invention, the rotating operation in the mounting direction can be performed with a relatively small rotating force, while the rotating operation in the detaching direction requires a relatively large rotating force. From this, the mounting of the valve fixture to the valve holder can be easily performed, and
The valve fixture attached to the valve holder can be made hard to come off from the valve holder. For this reason, it is not necessary to firmly attach the valve fixing device to the valve holder in order to prevent the valve fixing device from coming off unlike the conventional rotation fixed type valve fixing structure.

Therefore, according to the present invention, in a vehicle lighting device having a rotation-fixed type bulb fixing structure, the work of attaching and detaching the bulb fixing tool to and from the bulb holder can be easily performed. Thus, it is possible to improve the lamp assembly workability and the bulb replacement workability.

Further, since the elastic coefficients of the elastic arms for elastically supporting the pressing portions on the main body can be set to relatively small values, the dimensional accuracy of the valve fixture and the valve holder can be reduced. Even if the height is not set too high, it is possible to achieve uniform pressing of the valve at a plurality of locations by the elastic supporting force.

In the valve holder, the contact surface of the valve fixture with the pressing portions may be formed in a flat shape, but the contact surface is provided with the valve fixture in the mounting direction. Appropriate projections may be provided to move over some or all of the plurality of pressing parts when rotated, and in such a case, it is necessary to make sure that the valve fixture is prevented from coming off. Can be.

Although the specific shape of each of the "pressing portions" is not particularly limited, as described in claim 2, each of the pressing portions has a curved front surface at the distal end of each of the elastic arms. If it is formed so as to protrude in a shape, the coefficient of friction between the pressing portion and the contact surface of the valve holder can be set to a relatively small value, and during sliding. Since this can always be maintained at a substantially constant value, the work of attaching and detaching the valve fixture to and from the valve holder can be performed more easily.

Further, as a specific shape of each of the elastic arms, for example, the elastic arms may be formed to be bent at the base end of the elastic arms and to be inclined forward and extend. In this case, as described in claim 3, the bending line at the time of the bending is formed such that the inner peripheral end of the bending line is directed toward the mounting direction with respect to the radial direction of the optical axis. Setting the displaced line
It is preferable for the following reasons.

That is, since each of the elastic arms extends in the detaching direction, the base end and the distal end have different angular positions with respect to the optical axis. For this reason,
If the bending line is simply set as a line extending in the radial direction of the optical axis, the length of the lever between the base end and the end of each elastic arm will be short. On the other hand, if the bent line is set to a line whose inner peripheral end is displaced toward the mounting direction, the lever length can be increased. As a result, sufficient elastic energy can be stored in each of the elastic arms, so that even when the elastic coefficient is set to be small, a sufficient elastic force can be applied to each of the pressing portions.

As described above, the valve fixture is mounted on the valve holder by rotation about the optical axis. The mounting function is provided at each of the engaging portions by forming an annular shape covering the valve holding member and forming a plurality of engaging portions on its outer peripheral portion to be engaged with the outer peripheral front end portion of the valve holding device. Therefore, it is sufficient that each of the pressing portions and each of the elastic arms have only a function of pressing the valve elastically from behind. That is, in the above-described valve fixing device, the portion exhibiting the mounting function and the portion exhibiting the elastic pressing function are separated from each other, so that both functions can be sufficiently exhibited.

In this case, if each of the engagement portions is formed by deforming a part of the outer peripheral surface portion of the valve fixing member inward, as described in claim 5, Since both ends in the rotation direction of the engagement portion can be formed in a shape continuous with the other portion of the outer peripheral surface portion, it is possible to smoothly engage the outer peripheral front end portion of the valve holder. Becomes

The "valve fixing device" may be any one which is mounted on the valve holder by rotation about the optical axis and is configured to press the valve from the rear at the time of mounting. The material, manufacturing method, and the like are not particularly limited, but if the plate-shaped spring material is formed by machining, the valve fixture can be manufactured easily and inexpensively.

[0028]

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

FIG. 1 is a side sectional view showing an entire structure of an embodiment of a bulb fixing structure in a vehicle lamp according to the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. FIG. 3 is a view in the direction of arrow III in FIG.

As shown in these figures, a vehicular lamp 10 according to the present embodiment is a round fog lamp provided with a discharge bulb 12, and includes a discharge bulb 12, a reflector 14, a lens 16, It has a socket fixture 18 (valve holder) and a set spring 20 (valve fixture).

The discharge bulb 12 has a bulb body 12A.
And a base portion 12B that supports the valve body 12A.
A flange portion 12Ba is formed in 2B.

The reflector 14 is a press-formed product made of a steel plate, and has a paraboloidal reflecting surface 14a whose center axis is the optical axis Ax of the lamp. Has been adhered to. This lens 1
A plurality of lens steps 16 s are formed on the inner surface of 6.

At the rear apex of the reflector 14, a cylindrical annular wall 14b centering on the optical axis Ax is formed so as to protrude rearward, whereby the valve insertion hole 14c is formed.
Is formed. The annular wall 14b is formed such that its rear end surface is located in a plane orthogonal to the optical axis Ax, and has a cutout 14d for positioning a socket fixture at the right end thereof. .

The socket fixture 18 is an annular member made of aluminum die-casting attached to the reflector, and has an insertion hole 18a through which the bulb body 12A of the discharge bulb 12 is inserted, and a peripheral portion of the insertion hole 18a. Collar 1 of base 12B of discharge bulb 12
A bulb mounting seat 18b for positioning the discharge bulb 12 in contact with 2Ba is formed. The socket fixture 18 holds the discharge bulb 12 at a predetermined position in the bulb insertion hole 14c of the reflector 14. The predetermined position is such that the optical axis of the discharge bulb 12 coincides with the optical axis Ax and the discharge bulb 12 is positioned at the focal position of the reflector 14.
Are set as the positions where the light-emitting portions are matched.

On the front surface of the flange 12Ba of the base 12B of the discharge bulb 12, three projections 12Bb are formed at equal angular intervals about the optical axis Ax.
These three projections 12Bb are formed at a position directly below the optical axis Ax and at a position 120 ° to the left and right from the position directly below the optical axis Ax. A notch 12B for positioning the discharge bulb around the optical axis Ax is formed at the upper end of the flange 12Ba.
Further, a notch 12Bd for identifying a discharge bulb specification is formed slightly to the right of the upper end of the flange 12Ba.

Here, a detailed configuration of the socket fixture 18 will be described.

FIG. 4 is a view showing a state where the set spring 20 is removed from FIG. FIGS. 5 and 6 are front views showing the socket fixture 18 as a single item (FIG. 1).
FIG. 7 and 8 are sectional views taken along lines VII-VII and VIII-VIII in FIG. 5, and FIG. 9 is a view taken in the direction of arrow IX in FIG.

As shown in these figures, the bulb mounting seat 18b of the socket fixture 18 comes into contact with the three projections 12Bb of the discharge bulb 12 to position the discharge bulb 12 in the optical axis direction. Positioning annular surface 18c
A positioning peripheral wall 18d formed with a diameter slightly larger than the outer peripheral surface of the flange portion 12Ba of the discharge bulb 12 and positioning the discharge bulb 12 in the direction orthogonal to the optical axis; and a notch 12Bc of the discharge bulb 12 Key 18 for positioning the discharge bulb 12 about the optical axis by engaging
e, and an identification key 18f that engages with the notch 12Bd of the discharge bulb 12 to identify the specification of the discharge bulb 12.

The positioning peripheral wall 18d is formed so as to protrude rearwardly from an annular surface 18g which is one step larger and is formed in a step-like shape on the rear side of the positioning annular surface 18c. The discharge bulb 12
Of the socket fixture 18
Is set to be flush with the rear surface of the flange portion 12Ba of the discharge bulb 12 in a state of contact with the bulb mounting seat 18b. However, the positioning peripheral wall 18d
Are formed so as to be flush with the annular surface 18g at three places. The positions where these missing portions are formed are set at angular positions rotated clockwise by 40 ° with respect to the three projections 12Bb of the discharge bulb 12. At this time, the positioning key 18e is located at the left end of the upper right portion of the positioning peripheral wall 18d.

A convex portion 18h is formed at the right end of the upper left portion of the positioning peripheral wall 18d so as to project rearward from a general portion of the positioning peripheral wall 18d. As shown in FIG. 8, the protrusion 18h has a trapezoidal cross section in the circumferential direction. The slope 18s on the counterclockwise side extends only up to the rear surface of the positioning circumferential wall 18d. The clockwise slope 18t extends to the annular surface 18g and is set at a slightly larger inclination angle than the slope 18s.

The cylindrical portion 18 of the socket fixture 18
j is the outer diameter of the annular wall 14 of the reflector 14
The inner diameter is set to substantially the same value as the inner diameter dimension of b, and the outer peripheral surface is inscribedly fitted to the annular wall 14b. At the right end of the outer peripheral surface 18j, there is formed a positioning key 18k which engages with the notch 14d of the reflector 14 to position the socket fixture 18 around the optical axis Ax.

Further, a flange portion 18m having a rectangular cross section is formed at the rear of the outer peripheral surface of the cylindrical portion 18j of the socket fixture 18. The flange portion 18m is formed in a ring shape, but is missing over a predetermined width at a position directly above the optical axis Ax and at a position 120 ° left and right from the position directly above the optical axis Ax. At the central portion of each of the notches on the outer peripheral surface of the cylindrical portion 18j, a crimping groove portion 18n having a U-shaped cross section is formed to extend a predetermined length forward from the annular surface 18g side.

The mounting of the socket fixture 18 to the reflector 14 is performed by connecting the cylindrical portion 18j of the socket fixture 18 to the annular wall 1 of the reflector 14.
4b, while the flange portion 18m of the socket fixture 18 is pressed against the rear end surface of the annular wall 14b, a portion of the annular wall 14b opposite to the caulking groove portion 18n is formed. The end is the optical axis A
This is performed by protruding in the x-direction and caulking the caulking grooves 18n, and forming caulking portions 14e at three places on the annular wall 14b.

As shown in FIG. 9, the front end face of each of the three portions constituting the flange portion 18m of the socket fixture 18 located on the clockwise side of each of the notched portions is formed with the flange portion 18m. A stopper plane 18p which is one step lower than the front end face of the general part, and a tapered surface 18 which recedes from the stopper plane 18p toward the above-mentioned missing portion.
q.

Next, a detailed configuration of the set spring 20 will be described.

FIG. 10 is a front view (a view in the direction of arrow III in FIG. 1) showing the set spring 20 as a single item.
1 is a sectional view taken along line XI-XI in FIG. FIG.
FIG. 12 is a view as viewed in the direction of the arrow XII in FIG. 11.

As shown in these figures, the set spring 20 is an annular member formed by subjecting a plate-like spring material to machining such as press working, and is rotated clockwise to form the socket fixture 18. The base portion 12B of the discharge bulb 12
Is pressed from the rear.

The above-mentioned set spring 20 is attached to the main body 20.
A and three elastic arm portions 20B and pressing portions 20C.

The main body 20A has an annular flat surface 20Aa.
And a cylindrical portion 20Ab bent forward from the outer peripheral end of the annular flat portion 20Aa. The cylindrical portion 20Ab is set to have a slightly larger outer diameter than the flange portion 18m of the socket fixture 18, and
At its front end, three engaging portions 20Ac that engage with the outer peripheral front end of the flange portion 18m are formed at equal angular intervals about the optical axis Ax. As shown in FIG. 12, each of the engagement portions 20Ac is formed by plastically deforming the front end of the cylindrical portion 20Ab toward the optical axis Ax, and has slope portions 20Ad at both ends. Are formed.

As shown in FIG. 10, the three elastic arms 20B are formed so as to extend in the counterclockwise direction (separation direction) from the inner peripheral portion of the annular flat portion 20Aa. The pressing portion 20C is formed so as to protrude forward in a curved shape at the distal end of the elastic arm portion 20B. The three elastic arms 20B and the pressing portion 20C are all set in the same shape, and are formed at equal angular intervals around the optical axis Ax.

Each of the elastic arms 20B is formed by forming an arc-shaped slit in the annular flat portion 20Aa, and cutting and raising the inside of the slit toward the front. At this time, each of the elastic arm portions 20B is bent at its base end, and its bending line L
Is set to a line whose inner peripheral end is displaced clockwise (mounting direction) with respect to the radial direction of the optical axis Ax (a line inclined at about 60 ° with respect to the radial direction).

Each of the pressing portions 20C has an arc-shaped cross section in the circumferential direction. The inner peripheral end of the pressing portion 20C protrudes toward the optical axis Ax from the inner peripheral end of each of the elastic arm portions 20B. It is configured. Thus, as shown in FIGS. 3 and 4, each of the pressing portions 20C comes into sliding contact with the outer peripheral surface of the cylindrical portion 12Be of the base portion 12B of the discharge bulb 12. Each of the elastic arms 20
The inner peripheral end of the pin B does not interfere with a pair of pins 12Bf formed on the outer peripheral surface of the cylindrical portion 12Be.
The diameter is set slightly larger than the distance between the tip portions of 2Bf.

The mounting of the set spring 20 to the socket fixture 18 is performed as follows.

That is, as shown in FIG. 4, each of the engaging portions 20Ac of the cylindrical portion 20Ab of the set spring 20 is aligned with each of the missing portions of the flange portion 18m of the socket fixture 18, and After the pressing portion 20C is brought into contact with the rear surface of the flange portion 12Ba of the discharge bulb 12 and the rear end surface of the positioning peripheral wall 18d of the socket fixture 18, the set spring 20 is rotated clockwise. Due to this rotation, each of the engagement portions 20Ac rides on the stopper plane 18p along the tapered surface 18q (see FIG. 9) of the flange portion 18m, so that the main body portion 20A of the set spring 20 is displaced forward. Along with this, the elastic arms 20B are elastically displaced, and the pressing force of the pressing portion 20C at the distal end is increased.

At this time, as shown in FIG. 8, one pressing portion 20C is brought into contact with the rear end surface of the positioning peripheral wall 18d of the socket fixture 18 (and the rear surface of the flange portion 12Ba of the discharge bulb 12). 18h from the contact state
And comes into contact with only the rear surface of the flange portion 12Ba of the discharge bulb 12. That is, at this time, the pressing portion 20C floats from the annular surface 18g of the socket fixture 18. Thus, the pressing function of the pressing portion 20C against the discharge bulb 12 is sufficiently exhibited. The other two pressing portions 20C are connected to the socket fixture 18.
From the rear end surface of the positioning peripheral wall 18d (and the rear surface of the flange portion 12Ba of the discharge bulb 12) to the state where it is in contact with only the rear surface of the flange portion 12Ba of the discharge bulb 12 as it is.

The set spring 20 is prevented from rotating at a position where each engaging portion 20Ac abuts on the clockwise side wall 18r of the stopper plane 18p (see FIG. 9) of the socket fixture 18. Thereby, positioning in the rotation direction at the time of mounting is performed. As shown in FIG. 12, since the inclined portions 20Ad are formed at both ends of the engaging portions 20Ac, the engaging portions 20Ac are formed at the time of the rotation.
Can be smoothly slid along the tapered surface 18q of the flange portion 18m to easily ride on the stopper plane 18p.

As shown in FIG. 4, each engaging portion 20Ac of the set spring 20 is connected to the socket fixture 18
In the state where it is aligned with each missing portion of the flange portion 18m, the three pressing portions 20C of the set spring 20
Although it is at the same angular position as the three projections 12Bb of the discharge bulb 12, when the set spring 20 is rotated clockwise to complete the mounting on the socket fixture 18, as shown in FIG. Each pressing part 20C
Is 40 degrees clockwise with respect to each of the protrusions 12Bb.
At the angular position shifted by °, it comes into contact with the flange portion 12Ba of the discharge bulb 12.

As described above in detail, in the present embodiment, the socket fixture 18 attached to the reflector 14 allows the valve insertion hole 14c of the reflector 14 to be inserted.
The discharge bulb 12 held at a predetermined position is fixed to the socket fixture 18 by a rotation-fixed set spring 20. The set spring 20 includes a main body 20A and a main body 20A. Main unit 20A
, Three equal-length elastic arms 20B arranged at 120 ° intervals so as to extend in an arc shape in a counterclockwise direction (separation direction) from each other, and a pressing portion 20C formed at a distal end portion of each of the elastic arms 20B. When mounted on the socket fixture 18, the three pressing portions 20C
Since the discharge bulb 12 is configured to be pressed from the rear, the rotation operation in the counterclockwise direction (mounting direction) can be performed with a relatively small rotating force, while the rotation operation in the clockwise direction (separation direction). Requires a relatively large rotating force (the reason has already been described with reference to FIGS. 15 and 16 in the section "Effects of the Invention").

Thus, the set spring 20 can be easily mounted on the socket fixture 18, and the set spring 20 mounted on the socket fixture 18 can be detached from the socket fixture 18. Can be difficult. This eliminates the need to firmly mount the set spring 20 to the socket fixture 18 in order to prevent the set spring 20 from coming off unlike the conventional rotation fixed valve fixing structure.

Therefore, according to the present embodiment, in the vehicular lamp provided with the rotary fixed type valve fixing structure, the work of attaching and detaching the set spring to and from the socket fixture can be easily performed. Thus, it is possible to improve the lamp assembly workability and the bulb replacement workability.

Moreover, since the elastic coefficient of each of the elastic arms 20B for elastically supporting each of the pressing portions 20C on the main body 20A can be set to a relatively small value,
Even if the dimensional accuracy of the set spring 20 and the socket fixture 18 is not set so high, the elastic support force can achieve uniform pressing of the valve at a plurality of locations.

In this embodiment, a convex portion 18h projecting rearward from the rear end face is formed on the positioning peripheral wall 18d of the valve mounting seat 18c of the socket fixture 18, and the set spring 20 is provided with 3
One of the two pressing portions 20C is mounted on the socket fixture 18 in a state of getting over the convex portion 18h, so that the convex portion 18h ensures that the set spring 20 is prevented from coming off. be able to.

Further, since each pressing portion 20C of the set spring 20 is formed so as to protrude forward in a curved shape at the distal end portion of each elastic arm portion 20B, the pressing portion 20C and the socket filter are formed. The coefficient of friction between the positioning peripheral wall 18d and the rear end face of the hook 18 can be set to a relatively small value, and can be maintained at a substantially constant value during sliding. Can be more easily attached to and detached from the socket fixture 18.

In the present embodiment, each of the elastic arms 20B is formed so as to be bent at its base end and to extend forward and incline, but the bending line at the time of bending is formed. Since L is set to a line in which the inner peripheral end of the bent line L is displaced clockwise with respect to the radial direction of the optical axis Ax, the following operation and effect can be obtained.

That is, in each of the elastic arms 20B extending in an arcuate shape in the counterclockwise direction, the angular position with respect to the optical axis Ax differs between the base end and the distal end. Assuming that the line L is the optical axis Ax
If the line is set to extend in the radial direction, the length of the lever between the base end and the front end is reduced,
If the bent line L is set to a line whose inner peripheral end is displaced clockwise as in this embodiment, the lever length can be lengthened accordingly.
As a result, a sufficient elastic energy can be stored in each of the elastic arms 20B. Therefore, even when the elastic coefficient is set to be small, it is possible to apply a sufficient elastic force to each of the pressing portions 20C. it can.

In this embodiment, the lever length of each elastic arm 20B is set to be as long as possible.
Although the bending line L is set to a line inclined at about 60 ° with respect to the radial direction of the optical axis Ax, if the circumferential length of each elastic arm portion is different from that of the present embodiment, the elastic arm It is preferable to appropriately set the inclination angle of the bending line L so that the lever length of the portion becomes as long as possible.

The set spring 20 according to the present embodiment is formed in an annular shape to cover the socket fixture 18, and the outer periphery thereof has the socket fixture 18.
A plurality of engaging portions 20Ac are formed to engage with the outer peripheral front end of the socket. Each of the engaging portions 20Ac has a function of attaching to the socket fixture 18, so that each of the pressing portions 20C and Each elastic arm portion 20B has only a function of elastically pressing the discharge bulb 12 from behind. In this way, in the set spring 20, by separating the portion exhibiting the mounting function and the portion exhibiting the elastic pressing function, both functions can be sufficiently exhibited.

Further, each of the engaging portions 20Ac is formed by plastically deforming the front end of the cylindrical portion 20Ab of the set spring 20 toward the optical axis Ax. Since the set portion 20Ad is formed, when the set spring 20 is rotated in the mounting direction, each of the engagement portions 20Ac slides smoothly along the tapered surface 18q of the flange portion 18m of the socket fixture 18. As a result, the stopper spring 18 easily rides on the stopper plane 18p.
0 can be easily attached to the socket fixture 18.

Since the set spring 20 is formed by machining a plate-shaped spring material, it can be manufactured easily and inexpensively.

Each pressing portion 20C according to the above embodiment has a circular cross section in the circumferential direction and a linear cross section in the radial direction. Instead of these pressing portions 20C, FIG. As shown in FIG. 14, a pressing portion 20C 'formed by projecting a portion near the inner peripheral end of the distal end of each elastic arm portion 20B forward in a hemispherical shape may be employed. Here, each of the pressing portions 20C 'is formed near the inner peripheral end of the distal end portion of each of the elastic arm portions 20B because the pressing portions 20C' are formed on the base portion 12B of the discharge bulb 12. This is for the purpose of contacting the rear surface of the portion 12Ba. By employing such pressing portions 20C ', the pressing of the discharge bulb 12 by the pressing portions 20C' can be ensured without forming missing portions at three places of the positioning peripheral wall 18d of the socket fixture 18. Can be performed.

In the above embodiment, the socket fixture 18 formed separately from the reflector 14 is attached to the reflector 14. However, the reflector has the same shape as the socket fixture 18. May be integrally formed to have a function as the socket fixture 18, and in such a case, the same operation and effect as the above embodiment can be obtained. .

Further, in the above-described embodiment, the bulb fixing structure in the lamp having the discharge bulb has been described. However, the lamp having the bulb other than the discharge bulb such as the halogen bulb also has the same structure as the socket fixture 18. By using a socket fixture in which the configuration of the mounting seat 18b is appropriately changed and adopting a valve fixing structure similar to that of each of the above embodiments in other respects, the same operation and effect as those of the above embodiment can be obtained. be able to.

Further, in the above-described embodiment, the fog lamp has been described as a vehicle lamp. However, other lamps such as a headlamp have the same configuration as the above-described embodiment by adopting the same configuration as the above-described embodiment. The operation and effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view showing the overall configuration of one embodiment of a bulb fixing structure in a vehicle lamp according to the present invention.

FIG. 2 is an exploded perspective view showing the overall configuration of the embodiment.

FIG. 3 is a view in the direction of arrow III in FIG. 1;

FIG. 4 is a view showing a state where a set spring is removed from FIG. 3;

FIG. 5 is a front view showing the socket fixture of the embodiment as a single item (a view seen in the direction of arrow III in FIG. 1).

FIG. 6 is a rear view showing the socket fixture as a single item;

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 5;

8 is a sectional view taken along line VIII-VIII in FIG.

9 is a view taken in the direction of the arrow IX in FIG. 5;

FIG. 10 is a front view showing the set spring of the embodiment as a single item (a view seen in the direction of arrow III in FIG. 1);

11 is a sectional view taken along line XI-XI in FIG.

FIG. 12 is a view taken in the direction of the arrow XII in FIG. 11;

FIG. 13 is a front view showing a modification of the set spring of the embodiment as a single item (a view as seen in the direction of arrow III in FIG. 1);

14 is a sectional view taken along line XIV-XIV in FIG.

FIG. 15 is a schematic view showing the operation of the present invention (in the case of a rotation operation in the mounting direction).

FIG. 16 is a schematic view showing the operation of the present invention (in the case of a rotating operation in the detaching direction).

[Explanation of symbols]

 2 Valve Fixing Tool 2A Main Body 2B Elastic Arm 2C Pressing Part 4 Valve Holder 10 Headlamp (Vehicle Lamp) 12 Discharge Bulb (Bulb) 12A Valve Body 12B Base 12Ba Collar 12Bb Projection 12Bc, 12Bd Notch 12Be Cylindrical portion 12Bf Pin 14 Reflector 14b Annular wall 14c Valve insertion hole 14d Notch portion 14e Caulking portion 14f Projection piece 16 Lens 18 Socket fixture (valve holder) 18a Insertion hole 18b Valve mounting seat 18c Positioning annular surface 18e Positioning peripheral wall 18e Positioning key 18f Identification key 18g Annular surface 18h Convex portion 18j Cylindrical portion 18k Positioning key 18m Flange 18n Caulking groove 18p Stopper plane 18q Tapered surface 18r Side wall 18s, 18t Slope 18u Shape slope 20 set spring (valve fixing device) 20A main portion 20Aa annular flat portion 20Ab tubular portion 20Ac engaging portion 20Ad slant portion 20B resilient arm portions 20C, 20C 'pressing portions Ax optical axis L fold line

Claims (5)

[Claims] 1. A valve, a reflector having a valve insertion hole formed at a rear top portion, a valve holder for holding the valve at a predetermined position in the valve insertion hole, and fixing the valve to the valve holder. A valve fixing device for a vehicle lamp comprising: a valve fixing device, wherein the valve fixing device is mounted on the valve holding device by rotation of the valve around an optical axis, and the valve is rearwardly mounted at the time of mounting. A plurality of pressing portions for pressing the valve are formed on the valve fixture at predetermined angular intervals around the optical axis, and each of the pressing portions is provided on the valve fixture. A plurality of elastic arms extending from the main body of the fixture in a direction opposite to the rotation direction at the time of mounting; Lube mounting structure. 2. A bulb in a vehicle lamp according to claim 1, wherein each of said pressing portions is formed so as to project forward in a curved shape at a distal end portion of each of said elastic arm portions. Mounting structure. 3. The elastic arm portion is formed so as to be bent at a base end portion of the elastic arm portion and extend so as to be inclined forward, and the bending line at the time of the bending is formed by the light beam. 3. The bulb for a vehicle lamp according to claim 1, wherein an inner peripheral end of the bent line is set to a line displaced in a rotation direction side at the time of the mounting with respect to a radial direction of the shaft. Mounting structure. 4. The valve fixture is formed in an annular shape covering the valve holder, and a plurality of engaging portions for engaging with an outer front end of the valve holder are formed on an outer peripheral portion. The bulb mounting structure for a vehicle lamp according to any one of claims 1 to 3, wherein: 5. The vehicular lamp according to claim 4, wherein each of said engaging portions is formed by deforming a part of an outer peripheral surface portion of said bulb fixture inward. Valve mounting structure.