JP4912751B2 - Mounting structure for instrument movement - Google Patents

Description

  The present invention mainly relates to a mounting structure for an instrument movement used in a vehicle.

  Conventionally, a mounting structure for an instrument movement as shown in FIGS. 11 to 14 is known (see, for example, Patent Document 1).

  First, in terms of configuration, in this conventional instrument movement mounting structure, a casing member 1 constituting a movement housing is provided on the back surface side 4a of an instrument circuit board 4 provided in an instrument mounted on a vehicle. Is installed.

  In the casing member 1, an electric motor (not shown) that is rotationally driven by the supply of electric power, a reduction gear group that decelerates the rotational driving force of the electric motor, and a final gear are used to transmit the rotational driving force to the pointer 9. And a rotation shaft member 8 and the like for transmitting to the head.

  Further, the casing member 1 is mainly configured to have a lower case 2 and an upper case 3 that are substantially sealed by a marriage.

  Among these, from the vicinity of the bottom surface portion on the upper case 3 side, a pair of locking arm portions 5, 5 that can be elastically deformed toward the lower case 2, so that the lower case 2 is integrated with the upper case 3. It extends along the side surfaces 2a, 2a.

  Locking claw portions 6 and 6 are formed at the tips of the locking arm portions 5 and 5, respectively.

  Further, the inner side surfaces 5a and 5a are applied to the side surface portions 2a and 2a of the lower case 2 at positions facing the locking arm portions 5 and 5 due to elastic deformation of the locking arm portions 5 and 5, respectively. Stopper portions 7 and 7 that are in contact with each other are formed to project.

  Next, the operation of this conventional instrument movement mounting structure will be described.

  In this conventional instrument movement mounting structure, the locking arm portions 5 and 5 are respectively inserted into the pair of locking holes 4b and 4b formed in the instrument circuit board 4 from the back side 4a. The casing member 1 is mounted on the back side 4a of the instrument circuit board 4 by locking the locking claws 6 and 6 to the peripheral edges of the locking holes 4b and 4b.

At this time, as shown in FIG. 12, the inner surfaces of the locking arm portions 5, 5 are formed on the stopper portions 7, 7 that are formed to protrude from the positions facing the locking arm portions 5, 5. 5a and 5a are brought into contact with each other, and movement in the direction of the rotation shaft member 8 having a predetermined dimension or more is prevented. Thus, the possibility that the insertion becomes impossible due to contact with the back surface side of the periphery of the locking holes 4b and 4b is reduced.
Japanese Patent No. 3644406 (paragraphs 0016 to 0039, FIGS. 1 and 2)

  In the conventional instrument movement mounting structure configured as described above, the locking claws 6 and 6 of the locking arm portions 5 and 5 are easily inserted into the locking holes 4b and 4b. The size of the locking holes 4b, 4b is set larger.

  Therefore, as shown in FIG. 13, the locking claws 6 and 6 of the locking arm portions 5 and 5 are locked in the locking holes 4 b and 4 b formed in the instrument circuit board 4. In this state, as shown in FIG. 14, a gap is formed between the locking holes 4 b and 4 b and the locking arm portions 5 and 5.

  From such a gap portion, contamination such as dust, cloth, fiber, etc., and the synthetic resin generated when the locking arm portion 5 or the locking claw portion 6 is slidably contacted with the periphery of the locking hole 4b. There was a possibility that dust such as wear powder of the material could enter the inside of the instrument.

  Further, when the size of the locking holes 4b, 4b is large, as shown by a two-dot chain line in FIG. 14, the space A portion between the rotating shaft member 8 and the locking holes 4b, 4b is For example, there is a problem that it becomes difficult to mount an illumination LED or the like on the instrument circuit board 4.

  Accordingly, an object of the present invention is to provide an instrument movement mounting structure that can prevent dust from entering the inside of the instrument and can improve the space efficiency on the circuit board, and has good assemblability.

In order to achieve the above object, the invention described in claim 1 is an elastically deformable locking arm integrally extended from a casing member of an instrument movement in a locking hole formed in a circuit board. The casing member of the instrument movement is inserted into the circuit board by engaging a locking claw portion formed outwardly at the tip of the locking arm portion with the periphery of the locking hole. a mounting structure of the instrument for movement to be attached to the inner side surface opposite to the outer side surface of the locking claw portion of the locking arm portion is formed, the locking arm to the locking hole when inserting, is characterized in that locking arm portion is inward to form a inclined surface that inclines outward has a greater angle of inclination than the displacement angle is elastically deformed.

  According to a second aspect of the present invention, the locking arm portion extends along the side surface portion of the casing member, and the stopper portion on which the locking arm portion abuts by elastic deformation is provided on the casing. Formed on the side surface of the member, the inclination angle of the inclined surface portion is set so that the inclined surface portion slides on the periphery of the locking hole when the locking arm portion is inserted into the locking hole. The instrument movement mounting structure according to claim 1, wherein the arm portion is inserted into the stopper portion and is elastically deformable in a direction away from the stopper portion.

The one described in claim 1 thus constructed, by the locking arm locking claw portion above the inclined surface portion formed on the inner side surface opposite to the outer side surface formed of, upon insertion The inclined surface portion is smoothly inserted while being in sliding contact with the periphery of the locking hole.

  For this reason, even if the locking hole is set to be relatively small, the assemblability can be improved, so that the locking claw portion of the locking arm portion is locked in the locking hole. In this state, the amount of the gap formed between the locking hole and the locking arm portion can be reduced, and dust can be prevented from entering the instrument.

  Further, according to a second aspect of the present invention, the inclination angle of the inclined surface portion is such that when the locking arm portion is inserted into the locking hole, the inclined surface portion is arranged at the periphery of the locking hole. The arm portion is set so as to be elastically deformable in the separating direction from the stopper portion while being inserted in sliding contact.

  For this reason, for example, when the assembly work is performed by a machine set or a hand set by an operator, the locking arm portion may be elastically deformed and held so as to come into contact with the stopper portion. At the time of insertion, the inclined surface portion can be slidably contacted with the peripheral edge of the locking hole, and the arm portion can be inserted from the stopper portion while being elastically deformed in the separation direction.

  Therefore, it can be similarly assembled by any method of a machine assembly or a manual assembly by an operator, and the assembly property can be improved.

  Next, an instrument movement mounting structure according to the best mode for carrying out the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated about the same or equivalent part as the said prior art example.

  1 to 10 show a mounting structure for an instrument movement according to the preferred embodiment of the present invention.

  First, the overall configuration will be described with reference to FIGS. 2 to 4. The instrument movement 10 of this embodiment is an instrument circuit board 4 provided in a combination meter 17 as an instrument mounted on a vehicle. It is to be mounted on the back side.

  The combination meter 17 is mainly configured by arranging a dial 21 provided with a display unit such as various hands 9 in a housing 20 constituted by a lower housing 18 and an upper housing 19.

  As shown in FIG. 4, a front cover member 22 made of transparent synthetic resin is mounted on the front side of the housing 20 so as to cover the dial 21, and on the back side, the instrument An instrument circuit board 4 to which the movement 10 is fixed is mounted.

  The instrument movement 10 includes a synthetic resin casing member 13 that includes a lower case 11 and an upper case 12 that are substantially sealed by engagement.

  In the casing member 13, there are a core member (not shown), an electric motor that generates a rotational driving force with the core member by supplying electric power, and a group of reduction gears that reduce the rotational driving force of the electric motor. Is provided.

  Further, as shown in FIG. 4, the casing member 13 is provided with a rotating shaft member 8 that pivotally supports the pointer 9, and a final gear member 8a that meshes with the reduction gear is fixed integrally therewith. .

  The rotational driving force of the electric motor is transmitted to the rotating shaft member 8 via the reduction gear group and the final gear member 8a, so that the pointer 9 is rotated.

  In addition, from the casing member 13, the metering arm 14, 14 made of synthetic resin that can be elastically deformed is integrated from the casing member 13 from the side edge of the bottom surface portion 12 a of the upper case 12. In the direction of the circuit board 4, the base side bent portions 14 a and 14 a are bent and extended by about 90 degrees.

  At the tips of these locking arm portions 14, 14, locking claw portions 15, 15 are formed projecting outward from each other.

  Then, the locking arm portions 14 and 14 are respectively inserted into the pair of locking holes 24b and 24b formed in the instrument circuit board 4 from the back side 4a so that the locking claw portions 15 and 15 are inserted. The casing member 13 is configured to be mounted on the back surface side 4a of the instrument circuit board 4 by being locked to the periphery of the locking holes 24b and 24b.

In the instrument movement mounting structure of this embodiment, as shown in FIG. 5, the outer side surfaces 14b, 14b on which the locking claws 15, 15 of the locking arm portions 14 , 14 are formed are opposite to each other. When inserting the locking arm portions 14 and 14 into the locking holes 24b and 24b in the inner side surfaces 14c and 14c, a displacement angle α2 at which the locking arm portions 14 and 14 are elastically deformed inward (FIG. 8). Inclined surface portions 14d and 14d are formed which have an inclination angle α1 (see FIG. 6) larger than the inclination (see FIG. 6) and incline outward .

  Also, the locking holes 24b, 24b of the instrument circuit board 4 of this embodiment are smaller than the conventional locking holes 4b, 4b shown in comparison with the two-dot chain lines in FIGS. Is set.

  Next, the function and effect of the instrument movement mounting structure of this embodiment will be described.

In the instrument movement mounting structure of the embodiment configured as described above, when the instrument movement 10 is mounted on the back surface side 4a of the instrument circuit board 4, as shown in FIG. the inclined surface 14d formed on the opposite inner surface 14c and the locking claw part 15 is formed outside surface 14b of the arm portion 14, the inner peripheral edge 24c of the locking hole 24b during insertion, the inclined by surface portion 14d is guided while being in sliding contact, it becomes so that the smoothly inserted.

  For this reason, even if these locking holes 24b and 24b are set to be relatively small, the assemblability can be improved.

  Accordingly, as shown in FIG. 10, in the state where the locking claws 15 and 15 of the locking arm portions 14 and 14 are locked to the locking holes 24b and 24b, the locking holes 24b and 24b, The amount of gaps formed between 24b and the locking arm portions 14 and 14 can be reduced, and dust can be prevented from entering the instrument.

  Further, as shown in FIG. 10, it is possible to set a wide space on the instrument circuit board 4 between the rotating shaft member 8 and the locking holes 24b and 24b. Can be easily mounted on the instrument circuit board 4 between the rotating shaft member 8 and the locking holes 24b, 24b.

  Therefore, the space efficiency on the circuit board can be improved, and the degree of freedom in layout can be improved.

  1 to 10 show a mounting structure for an instrument movement according to Example 1 of the best mode of the present invention.

  Note that portions that are the same as or equivalent to those in the above-described embodiment are described with the same reference numerals as those in the above-described embodiment.

  First, the configuration of the first embodiment will be described. In the instrument movement mounting structure of the first embodiment, as shown in FIG. 5, the locking arm portions 14, 14 are connected to the side surface portion 13 a of the casing member 13. , 13a.

  Stopper portions 13b and 13b with which the inner side surfaces 14c and 14c of the locking arm portions 14 and 14 come into contact with each other by elastic deformation are formed on the side surface portions 13a and 13a of the casing member 13, respectively.

  Then, as shown in FIG. 6, the inclination angle α1 of the inclined surface portion 14d with respect to the inner side surface 14c of the locking arm portion 14 is changed by the elastic deformation of the locking arm portions 14 and 14, as shown in FIG. The inner side surfaces 14c and 14c are set so as to be larger than the vertical displacement angle α2 (α1> α2) until they contact the stopper portions 13b and 13b.

Therefore, the stopper portion 13b by the elastic deformation, with the inner surface 14c of the locking arm 14 is stopped in contact with the 13b, a predetermined positive angle expanding outside the vertical .alpha.3 (Example 1 in about 0.5 degrees to 30 degrees) is configured to obtain.

Further, as shown in FIG. 7, I by the elastic deformation of the locking arm 14 and 14, in a state in which the inner surface 14c, 14c is, the stopper portion 13b, which abuts against the 13b, the locking tip 14e of the arm portions 14, 14, 14e is, the locking hole 24b, the inner peripheral edge 24c of 24b, from 24c, by being spaced at a predetermined distance d1, d1, locking arm 14, 14 tip 14e, 14e of, without contact or the like on the back side 4a of the instrument circuit board 4, easily the locking hole 24b, and is configured to be inserted into 24b.

  As described above, in the first embodiment, the predetermined positive angle α3 that expands outward from the vertical direction is obtained. Therefore, as shown in FIG. 9, the locking arm portions 14 are provided in the locking holes 24b and 24b. 14 are inserted into the inner peripheral edges 24c and 24c of the locking holes 24b and 24b so that the inclined surfaces 14d and 14d are slidable and can be inserted.

  In addition, the reaction force by which the inclined surface portions 14d and 14d are slidably contacted with the inner peripheral edges 24c and 24c causes the locking arm portions 14 and 14 to move away from the stopper portions 13b and 13b. It is set to be elastically deformable.

  Further, in the first embodiment, as shown in FIG. 10, there are provided inclination start points 14f and 14f for connecting the inner side surfaces 14c and 14c of the locking arm portions 14 and 14 and the inclined surface portions 14d and 14d. It has been.

  The inclination starting points 14f and 14f are inserted into the locking holes 24b and 24b in a state where the locking claws 15 and 15 are locked to the peripheral edges of the locking holes 24b and 24b. The entire area of the substantially locking holes 24b and 24b is slightly set by the locking arm portions 14 and 14 and the locking claw portions 15 and 15 provided integrally therewith. It is configured to be covered while leaving a clear gap.

  Next, the function and effect of the instrument movement mounting structure of the first embodiment will be described.

  In the instrument movement mounting structure of Example 1, in addition to the effects of the above embodiment, when the instrument movement 10 is mounted on the back side 4a of the instrument circuit board 4, FIG. As shown in FIG. 8, the outer side surfaces 14 a, 14 a of the locking arm portions 14, 14 are gripped from the outside in order to perform mechanical assembly or hand assembly by an operator, and the root-side bent portion 14 a. , 14a, when the locking arm portions 14, 14 are elastically deformed, inclination start points 14f, 14f provided on the inner side surfaces 14c, 14c are formed on the side surface portions 13a, 13a of the casing member 13, respectively. The stoppers 13b and 13b are brought into contact with each other to stop the movement in the inward direction.

  In addition, as shown in FIG. 7, the locking arm portion 14c and 14c are in contact with the stopper portions 13b and 13b due to the elastic deformation of the locking arm portions 14 and 14, respectively. The tip portions 14e, 14e of the 14, 14 are spaced apart from the inner peripheral edges 24c, 24c of the locking holes 24b, 24b by a fixed distance d1, d1.

Therefore, as shown in FIG. 7, first, the tip portions 14e and 14e are inserted into the locking holes 24b and 24b without coming into contact with the peripheral edge of the back surface side 4a of the locking holes 24b and 24b. In addition, the inclined surfaces 14d and 14d formed on the inner surfaces 14c and 14c on the opposite side to the outer surfaces 14b and 14b on which the locking claws 15 and 15 are formed are the locking holes 24b and 24b. It is inserted smoothly by being guided while sliding in contact with the inner peripheral edges 24c, 24c .

  Therefore, even if these locking holes 24b and 24b are set to be relatively small, the assemblability can be improved.

  In the first embodiment, the inclination angle α1 of the inclined surface portions 14d and 14d is as shown in FIG. 9 when the locking arm portions 14 and 14 are inserted into the locking holes 24b and 24b. When the inclined surface portions 14d and 14d are inserted in sliding contact with the inner peripheral edges 24c and 24c, the locking arm portions 14 and 14 made of synthetic resin are separated from the stopper portions 13b and 13. It is elastically deformed in the direction to expand, and smooth insertion is not hindered.

  For this reason, for example, when the assembly work is performed by a machine set or a hand set by an operator, the locking arm portions 14 and 14 are elastically deformed and brought into contact with the stopper portions 13b and 13b. As described above, even when gripped from the outer side surfaces 14b and 14b, the inner peripheral edges 24c and 24c of the locking holes 24b and 24b are slidably contacted with the inclined surface portions 14d and 14d at the time of insertion, thereby elastically deforming in the separating direction. On the other hand, the space between the locking arm portions 14 and 14 can be expanded and inserted.

  Therefore, it can be similarly assembled by any method of a machine assembly or a manual assembly by an operator, and the assembly property can be improved.

  Thus, in the state where the locking claws 15 and 15 of the locking arm portions 14 and 14 are locked in the locking holes 24b and 24b, as shown in FIG. The amount of gaps formed between the holes 24b, 24b and the locking arm portions 14, 14 can be reduced, and dust can be prevented from entering the inside of the instrument.

  Other configurations and operational effects are the same as or equivalent to those of the above-described embodiment, and thus description thereof is omitted.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

That is, in the first embodiment, the inclination angle α1 of the inclined surface portion 14d with respect to the inner side surface 14c of the locking arm portion 14 is changed by the elastic deformation of the locking arm portions 14 and 14, as shown in FIG. The inner side surfaces 14c, 14c are set to be larger than the vertical displacement angle α2 (α1> α2) until they contact the stopper portions 13b, 13b, but this inclined surface is curved or multistage. It may be.

FIG. 3 is an exploded perspective view for explaining a state in which the instrument movement is mounted on the instrument circuit board in the instrument movement attachment structure of the best mode of the present invention. It is a front view of the combination meter in which the mounting structure of the instrument movement of the embodiment is used. It is a rear view of the combination meter in which the mounting structure of the instrument movement of the embodiment is used. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2 for explaining the internal configuration of the combination meter in which the instrument movement mounting structure of the embodiment is used. It is a side view of the casing member explaining a structure by the instrument movement of Example 1 of an embodiment. It is an enlarged side view explaining the structure of the principal part in the instrument movement of Example 1 of an embodiment. It is a partial cross-sectional exploded view explaining the state of mounting in the mounting structure for an instrument movement of Example 1 of the embodiment. It is an enlarged side view explaining the state at the time of mounting | wearing with the attachment structure of the instrument movement of Example 1 of an embodiment. It is a partial sectional view in the state where the locking arm part is inserted in the locking hole in the mounting structure for the instrument movement of Example 1 of the embodiment. It is a partial cross section figure explaining the state where the casing member was mounted | worn with the attachment structure of the instrument movement of Example 1 of an embodiment. It is a decomposition | disassembly side view explaining a structure with the attachment structure of the movement for instruments of a prior art example. It is an enlarged sectional view of the important section at the time of wearing in the attachment structure of the instrument movement of the conventional example. It is a perspective view explaining the whole structure by the attachment structure of the movement for instruments of a prior art example. FIG. 14 is a plan view seen from the direction of the arrow Z in FIG. 13 in a conventional instrument movement mounting structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Movement 11 Lower case 12 Upper case 13 Casing member 13a Side surface part 13b Stopper part 14 Locking arm part 14b Outer side surface 14c Inner side surface 14d Inclined surface part 17 Combination meter (instrument)
24b Locking hole 24c Inner peripheral edge

Claims (2)

An elastically deformable locking arm portion integrally extended from the casing member of the instrument movement is inserted into the locking hole formed in the circuit board, and the outer end of the locking arm portion is directed outward. An instrument movement mounting structure for mounting the casing member of the instrument movement to the circuit board by locking the formed locking claw portion to the periphery of the locking hole ,
On the inner side surface of the engagement side opposite to the outer side surface of the locking claw portion is formed in the locking arm, when inserting the locking arm to the locking hole, the locking arm portion inwardly mounting structure of instrument movement, characterized in that the formation of the inclined surface inclined outward with a greater angle of inclination than the displacement angle which is elastically deformed toward.   The locking arm portion extends along the side surface portion of the casing member, and the locking arm portion forms a stopper portion on the side surface portion of the casing member that abuts by elastic deformation, and the inclined surface portion When the locking arm portion is inserted into the locking hole, the inclined surface portion is inserted in sliding contact with the peripheral edge of the locking hole, and the arm extends from the stopper portion. The instrument movement mounting structure according to claim 1, wherein the portion is set to be elastically deformable in the separation direction.

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