JP4908050B2 - 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, an attachment structure for an instrument movement as shown in FIGS. 9 to 12 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, the rotational driving force is transmitted to the pointer 9 through an electric motor that rotates by supplying electric power, a reduction gear group that decelerates the rotational driving force of the electric motor, and a final gear. A rotating shaft member 8 is provided.

  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. 10, the inner surfaces of the locking arm portions 5, 5 are formed on the stopper portions 7, 7 that are formed to project from 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. The possibility of being unable to insert due to contact with the back side of the 4b peripheral edge is reduced.
Japanese Patent No. 3644406 (paragraphs 0016 to 0039, FIGS. 1 and 2)

  However, in the conventional instrument movement mounting structure configured as described above, the opening area of the locking hole 4b of the circuit board 4 for the instrument is set to the locking claw formed at the tip of the locking arm portion 5. Unless the cross-sectional area is set larger than the horizontal direction of the portion 6, the locking arm portion 5 cannot be inserted and the locking claw portion 6 cannot be locked to the periphery of the locking hole 4b.

  For this reason, after mounting, a gap is formed between the periphery of the locking arm portion 5 and the inner peripheral edge of the locking hole 4b. From this gap, contamination such as dust, cloth, fiber, Alternatively, dust such as abrasion powder of synthetic resin material generated when the locking arm 5 or the locking claw 6 is slidably contacted with the periphery of the locking hole 4b may enter the inside of the instrument. there were.

  Further, after the mounting, if there is a gap between the periphery of the locking claw portion 6 and the peripheral edge of the locking hole 4b, the mounting position of the casing member 1 is centered on the rotating shaft member 8. Further, there is a possibility that the position is displaced in the rotation direction, and there is a problem that the indication accuracy of the pointer 9 is lowered.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides an instrument movement mounting structure that can suppress the intrusion of dust into the instrument, improve the indicator accuracy, and improve the assemblability. It is said.

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. An instrument for mounting the casing member of the instrument movement on the circuit board by inserting a portion into the engagement hole and engaging an engagement claw formed at the tip of the engagement arm with the periphery of the engagement hole. a mounting structure for use movement, with the locking arm by being protruded from the side surface portion positioned in the locking hole, provided with a projection portion which abuts on the opening edge of the locking hole, On the side surface portion of the casing member facing the locking arm portion, the locking arm portion protrudes and forms a stopper portion that abuts by elastic deformation, and the protrusion provided on the locking arm portion includes , The stopper Characterized in that a is a pair formed so as to slidably sandwich from both sides.

  According to the first aspect of the present invention configured as described above, the protruding portion protruding from the side surface portion of the locking arm portion positioned in the locking hole comes into contact with the inner peripheral edge of the opening of the locking hole. Thus, the gap between the side surface portion of the locking arm portion and the inner periphery of the opening of the locking hole is closed.

  For this reason, contamination such as dust, cloth, fiber, or the synthetic resin material generated when the locking arm portion or the locking claw portion and the locking hole periphery are in sliding contact with each other. There is a reduced risk that dust such as wear powder will enter the instrument.

  Further, after the casing member is mounted on the circuit board, the amount of the gap between the periphery of the locking arm portion and the inner periphery of the locking hole is reduced by the protrusion.

  For this reason, there is almost no possibility that the mounting position of the casing member is displaced in the rotation direction, and the indication accuracy of the pointer can be improved.

The stopper portion is slidably held by a pair of protrusions formed on the locking arm portion.

  For this reason, in a state where the locking claw portion is locked to the periphery of the locking hole, elastic deformation of the locking arm portion is suppressed by the stopper portion protruding from the side surface portion of the casing member. Furthermore, the indication accuracy of the pointer can be improved.

  That is, even if a twist is applied to the external force, the locking arm portion and the casing member are not twisted, and the indication accuracy is 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 8 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 pointers 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.

  Further, among the casing member 13, from the side edge of the bottom surface portion 12 a of the upper case 12, the latching arm portions 14 and 14 made of synthetic resin that can be elastically deformed are bottom surfaces of the upper case 12 of the casing member 13. It extends so as to be integrated from the side edge of the portion 12a, and is bent about 90 degrees from the root-side bent portions 14a and 14a toward the instrument circuit board 4.

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

  Then, as shown in FIGS. 5 and 6, the locking arm portions 14 and 14 are respectively inserted from the back surface side 4 a into a pair of locking holes 24 b and 24 b formed in the instrument circuit board 4. The locking claws 15 and 15 are locked to the peripheral edges of the locking holes 24b and 24b, so that the casing member 13 is mounted on the back side 4a of the instrument circuit board 4. ing.

  Further, these locking arm portions 14 and 14 are provided with a left side from a part of the inner side surfaces 14c and 14c located in the locking holes 24b and 24b in the vicinity of the locking claws 15 and 15 to the side. , A pair of right protrusions 14f and 14f are provided to protrude.

  The protrusions 14f and 14f are configured to contact the inner peripheral edges of the locking holes 24b and 24b in a state where the casing member 13 is mounted on the back surface side 4a of the instrument circuit board 4.

  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 stop arm portions 14 and 14 are inserted into the locking holes 24b and 24b, respectively, and the locking claw portions 15 and 15 are locked to the peripheral edges of the locking holes 24b and 24b.

  In this mounted state, as shown in FIGS. 5 and 6, the projecting portions 14 f and 14 f that project from the inner side surfaces 14 c and 14 c of the locking arm portions 14 and 14 and are integrally formed are formed in the locking holes. Abutting on the inner peripheral edges of the openings 24b and 24b, the space between the inner side surface 14c and the left and right side surfaces of the locking arm portions 14 and 14 and the inner peripheral edge of the locking hole 24b is closed.

  For this reason, it occurs when slidable contact occurs between contaminants such as dust, cloth, fibers, or the locking arm portion 14 or the locking claw portion 15 and the periphery of the locking hole 24b. The possibility that dust such as abrasion powder of the synthetic resin material enters the inside of the instrument is reduced.

  Further, after the casing member 13 is mounted on the back surface side 4a of the circuit board 4, the protrusions 14f and 14f allow the periphery of the locking arm portion 14 and the inner peripheral edge of the locking hole 24b to be formed. The amount of gap between them is reduced.

  For this reason, there is almost no possibility that the mounting position of the casing member 13 is displaced in the rotation direction with the rotation shaft member 8 as the rotation center, and the indication accuracy of the pointer 9 can be improved.

  That is, even if a twist is applied to the external force, the locking claw portion 15 of the locking arm portion 14 and the casing member 13 are not twisted, and the indication accuracy is improved.

  7 and 8 show the mounting structure of the instrument movement of 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. 7, the side surface of the casing member 13 that faces the locking arm portions 14 and 14 is shown. Stoppers 13b, 13b projectingly formed on the inner surfaces 14c, 14c of the respective locking arm portions 14, 14 by elastic deformation are respectively formed on the portions 13a, 13a.

  The engaging arm portions 14 and 14 are integrally provided with holding projection portions 114f and 114f as projection portions.

  These clamping protrusions 114f and 114f have a certain length along the side surface parts 13a and 13a toward the root-side bent parts 14a and 14a rather than the protrusion parts 14f and 14f of the above-described embodiment. A pair is formed so as to slidably hold the stopper portions 13b, 13b from both sides.

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

  In the instrument movement mounting structure according to the first embodiment, in addition to the operational effects of the above-described embodiment, when the instrument movement 10 is mounted on the back surface 4a of the instrument circuit board 4, the clamping is performed. The protrusions 114f and 114f are extended from the protrusions 14f and 14f of the above-described embodiment toward the root-side bent parts 14a and 14a with a certain length along the side surface parts 13a and 13a. As a result, the locking claw portions 15 and 15 are locked to the peripheral edges of the locking holes 24b and 24b by elastically deforming while being in sliding contact with both sides of the stopper portions 13b and 13b.

  Thus, in the state where the casing member 13 is mounted on the back surface side 4a of the circuit board 4, the stopper portions 13b and 13b are formed as a pair of holding projections 114f on the locking arm portions 14 and 14, respectively. , 114f.

  As shown in FIG. 7, the holding protrusions 114 f and 114 f are in contact with the peripheral edges of the locking holes 24 b and 24 b, so that the elastic deformation of the locking arm parts 14 and 14 causes the casing member 13 to It is suppressed by the stopper portions 13b and 13b protruding from the side surface portions 13a and 13a, and the indication accuracy of the pointer 9 can be further improved.

  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 pair of protrusions 14f and 14f are projected from the inner side surfaces 14c and 14c of the locking arm portions 14 and 14, but the present invention is not limited thereto, and the locking arm portion 14 is not limited thereto. , 14 projecting integrally from the left and right side surfaces of the locking arm portions 14, 14 or projecting from the corners straddling the left and right side surfaces of the locking arm portions 14, 14 and the inner surface 14c, etc. , 14f are not particularly limited in shape, quantity, and material, and the casing member 13 is in contact with the inner peripheral edges of the locking holes 24b and 24b in a state where the casing member 13 is mounted on the circuit board. Anything is acceptable.

It is a disassembled perspective view explaining a mode that the casing member of the instrument movement is mounted on the instrument circuit board in the instrument movement mounting 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 top view of the circuit board explaining the state with which the instrument movement of embodiment was mounted | worn. It is sectional drawing in the position along the BB line in FIG. 5 explaining the state at the time of mounting | wearing with the attachment structure of the instrument movement of embodiment. It is a top view of the circuit board explaining the state by which the instrument movement of Example 1 of an embodiment was equipped. It is sectional drawing in the position along the CC line in FIG. 7 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 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. 12 is a plan view seen from the direction of the arrow Z in FIG. 11 in the conventional instrument movement mounting structure.

Explanation of symbols

4 Instrument circuit boards (circuit boards)
DESCRIPTION OF SYMBOLS 10 Instrument movement 11 Lower case 12 Upper case 13 Casing member 13a Side surface part 13b Stopper part 14 Locking arm part 14c Inner side surface (side surface part)
14f, 14f Protrusion 17 Combination meter (instrument)
24b Locking holes 114f, 114f Nipping protrusion

Claims (1)

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 engagement formed at the tip of the locking arm portion. An instrument movement mounting structure for attaching the casing member of the instrument movement to the circuit board by locking the pawl portion to the periphery of the locking hole ,
Protruding portions that contact the inner periphery of the opening of the locking hole are provided on the locking arm portion by protruding from the side surface portion located in the locking hole ,
On the side surface portion of the casing member facing the locking arm portion, the locking arm portion protrudes and forms a stopper portion that abuts by elastic deformation, and the protrusion provided on the locking arm portion includes A mounting structure for an instrument movement , wherein a pair is formed so as to slidably hold the stopper portion from both sides .

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