JP2006064074A - Seal structure of selector switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide seal structure of a selector switch capable of easily and surely sealing an abutment part of a base and a cover body by always maintaining fastening force of a packing in stable condition without receiving an influence of the force for assembling the base and the cover body for fixation. <P>SOLUTION: In this seal structure of a selector switch 10, a switch case is structured of the base 12 provided with a plurality of fixed contact points 13 and the cover body 14 assembled to abut on the periphery of the base 12 to form a sealed inner space inside thereof. A movable board 15 provided with a movable contact point 16 sliding on the plurality of fixed contact points 13 to switch the contact point is arranged inside the switch case 11, and an annular packing 18 for sealing the abutment part of the base 12 and the cover body 14 is interposed between the base 12 and the cover body 14. The annular packing 18 provided between the base 12 and the cover body 14 is fastened in a direction crossing the assembling direction Y of the base 12 and the cover body 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal structure of a changeover switch suitable for use in an inhibitor switch that is mounted on an automatic transmission for a vehicle and is driven by a lever operation of an automatic transmission that sets a traveling state, for example.

  2. Description of the Related Art Conventionally, there is a technique related to a so-called change-over switch in which a movable board provided with a movable contact is rotated by an operation lever and the contact is switched by sliding on a base provided with a plurality of fixed contacts (for example, Patent Documents). 1). This is a structure in which a movable platen is disposed in a space formed by screwing and fixing the base and the lid (case), and a long hole is provided in the lid for fixing the changeover switch to the place where the switch is to be screwed. Met.

  However, in the conventional technique, the base and the lid are fixed with screws, and there are a large number of parts for screwing, which causes an increase in assembly man-hours. It also has a mounting seat function for fixing the changeover switch, and is inferior in workability.

  In order to cope with this, there is a changeover switch in which a base and a lid are each formed of a resin material, and both are joined by ultrasonic welding to constitute a switch case (see, for example, Patent Document 2).

  The changeover switch 1 is applied to, for example, an inhibitor switch that is mounted on an automatic transmission for a vehicle and is driven by a lever operation of the automatic transmission that sets a running state, as shown in FIGS. In addition, the switch case 2 having an internal space sealed by the base 3 and the lid 4 is configured. That is, the peripheral edge portion 4a formed on the entire periphery of the lower surface of the lid 4 is welded and bonded to the bonding portion 3a on the upper surface of the base 3 by ultrasonic welding.

  Furthermore, between the base | substrate 3 and the cover body 4, in order to improve the sealing performance of the junction part of both, the cyclic | annular packing 5 is interposed. The annular packing 5 is fitted in an annular groove 4 b formed around the outside of the lower surface of the lid body 4. The packing 5 is tightened in the direction in which the base 3 and the lid 4 are assembled, and the joint 3a of the base 3 and the peripheral edge 4a of the lid 4 are fixed by ultrasonic welding. It is designed to maintain power.

  As shown in FIGS. 6 and 7, a plurality of fixed contacts 6 are embedded in the central recess on the upper surface of the base 3. Further, a movable platen 7 is disposed in the switch case 2. The cylindrical shaft portion 7 a of the movable platen 7 is rotatably supported by the through hole 3 b of the base 3 and the bearing portion 4 c of the lid 4. In the cylindrical shaft portion 7a, a rotary shaft 9 for an automatic transmission having an operation lever 9A screwed and fixed at the tip is fitted and fixed. Thereby, the rotating shaft 9 rotates together with the movable platen 7 in the switch case 2. In addition, the lower surface of the movable platen 7 is provided with a plurality of movable contacts 8 slidably contacting the plurality of fixed contacts 6 to perform a switching action. Each movable contact 8 is biased toward the fixed contact 6 by a compression spring 8B.

Japanese Utility Model Publication No. 1-170924

Japanese Utility Model Publication No. 6-68265

  However, in the seal structure of the conventional changeover switch 1, the tightening direction of the packing 5 is the same as the assembly direction (fixing direction) of the base 3 and the lid body 4, so the annular groove 4 b of the lid body 4 on which the packing 5 is set. Since the stress concentrates on the weld fixing part (joint part 3a of the base 3 and the peripheral part 4a of the lid 4) in the vicinity of the base plate, it is difficult to adjust the tightening force of the packing 5 and the weld fixing force of the base 3 and the lid 4 Thus, when the welding and fixing of the joint portion 3a of the base 3 and the peripheral edge portion 4a of the lid 4 were incomplete, a sealing failure occurred. Moreover, it is difficult to always maintain high quality due to excessive or insufficient welding amount (penetration amount) between the joint portion 3a of the base 3 and the peripheral edge portion 4a of the lid body 4, and correction is impossible after welding, so the yield is poor. It became expensive. Furthermore, the packing 5 is easily lifted from the annular groove 4b of the lid body 4. When the joint portion 3a of the base 3 and the peripheral edge portion 4a of the lid body 4 are welded and fixed in a state where the packing 5 is floated, the packing 5 is A seal failure occurred due to being bitten by the upper surface of the base 3 and the lower surface of the lid 4. Furthermore, the lid body 4 was easily deformed with time due to the tightening reaction force or temperature change of the packing 5, and tightening was loosened in the packing 5 and the sealing performance was impaired. For this reason, it is necessary to provide the welding part of the junction part 3a of the base | substrate 3 and the peripheral part 4a of the cover body 4 in the position in the vicinity of the annular groove 4b of the cover body 4 in which the packing 5 is set, and becomes restrictions on space. It was.

  Therefore, the present invention has been made to solve the above-described problems, and can be maintained in a stable state of the fastening force of the packing without being affected by the fixing force of the base and the lid, It is an object of the present invention to provide a seal structure for a changeover switch capable of easily and reliably sealing a contact portion between a base and a lid.

  According to the first aspect of the present invention, a switch case is constituted by a base having a plurality of fixed contacts and a lid body that is assembled so as to abut on the periphery of the base and forms a sealed internal space. A movable board having a movable contact that slides on the plurality of fixed contacts and switches the contacts is disposed in a case, and an annular packing that seals a contact portion between the base and the lid is provided on the base In the sealing structure of the changeover switch interposed between the lid body, the tightening direction of the annular packing between the base and the lid is a direction orthogonal to the assembly direction of the base and the lid. To do.

  According to a second aspect of the present invention, there is provided a seal structure for the changeover switch according to the first aspect, wherein an engagement hole is provided in one of the base and the lid, and the other is locked and detached from the engagement hole. A locking claw is provided to allow the base and the lid to be assembled freely.

  The invention according to claim 3 is the seal structure of the changeover switch according to claim 1, wherein a fitting groove is provided in one of the base and the lid, and an end portion fitted into the fitting groove is provided in the other. Provided, and the annular packing can be tightened from the direction orthogonal to the assembling direction of the base and the lid through the end portion.

  As described above, according to the first aspect of the present invention, the tightening direction of the annular packing between the base and the lid is a direction perpendicular to the assembling direction of the base and the lid, so that the tightening direction of the annular packing is The direction of the inner diameter and the outer diameter of the packing perpendicular to the assembling direction of the base and the lid can be set, so that concentration of stress on the contact portion and the seal portion of the base and the lid can be avoided. As a result, the tightening force of the annular packing can always be maintained in a stable state, and the contact portion between the base and the lid can be easily and reliably sealed.

  According to the second aspect of the present invention, the base and the lid can be assembled freely by providing the engagement hole in one of the base and the lid, and providing the locking claw to be locked and detached in the other on the other. By doing so, the locking claw can be locked in the engagement hole by snap fit, and the base and the lid can be easily and reliably fixed. Moreover, since the latching claw can be removed from the engagement hole, the base and the lid can be disassembled and reassembled, and the yield can be improved.

  According to the invention of claim 3, the fitting groove is provided in one of the base and the lid, and the end fitted into the fitting groove is provided in the other, and the annular packing is attached to the base through the end. By making it possible to tighten from the direction orthogonal to the assembly direction of the lid, the end of the ring fitted into the fitting groove is securely tightened with a stable clamping force in the direction perpendicular to the assembly direction of the base and lid. be able to.

  Embodiment 1 of the present invention will be described below with reference to the drawings.

  1 is a cross-sectional view showing a changeover switch according to a first embodiment of the present invention, FIG. 2 is a bottom view of the changeover switch, FIG. 3 is a cross-sectional view taken along line EE in FIG. 2, and FIG. It is an expanded sectional view of a part.

  As shown in FIGS. 1 and 2, the inhibitor switch (switching switch) 10 is mounted on, for example, a vehicle automatic transmission and is driven by a lever operation of the automatic transmission that sets the running state. A box-shaped switch case 11 is provided. The switch case 11 is assembled so as to be in contact with the substantially disk-shaped base 12 made of resin in which a plurality of fixed contacts 13 are embedded in the center of the upper face 12a by insert molding or the like, and the outer peripheral side of the upper face 12a of the base 12. And a resin lid 14 that forms a sealed internal space. In the switch case 11, a movable platen 15 having a plurality of movable contacts 16 that slide on the plurality of fixed contacts 13 of the base 12 to switch the contacts is disposed. Each movable contact 16 is always urged toward the fixed contact 13 by a compression spring 17. Further, a rubber-made annular packing 18 is interposed between the base 12 and the lid 14 so as to seal a contact portion between the upper surface 12 a of the base 12 and the stepped portion 14 d of the peripheral wall portion 14 c of the lid 14.

  As shown in FIGS. 1 and 4, an annular concave fitting groove 19 is formed on the outer peripheral side of the upper surface 12 a of the base 12, and above the center of the inner peripheral surface 19 a of the fitting groove 19. The fitting recess 20 is formed in a step shape. A cylindrical end 14 e of the lid 14 is fitted in the fitting groove 19 of the base 12, and an annular packing 18 made of rubber is formed on the inner peripheral surface 20 a of the fitting recess 20. Is fitted with a slight tension. Further, the rubber-made annular packing 18 has a horizontal direction X which is a direction orthogonal to a vertical direction Y which is an assembly direction of the base 12 and the lid body 14 through an inner peripheral surface 14f of the end portion 14e of the lid body 14. Further, it is fastened to the inner peripheral surface 20 a of the fitting recess 20. That is, the fastening direction X of the rubber-made annular packing 18 between the base 12 and the lid 14 is perpendicular to the assembly direction Y of the base 12 and the lid 14, and the annular packing 18 is the base 12. Are fitted on the inner peripheral surface 20a of the fitting recess 20 and the inner peripheral surface 14f of the end portion 14e of the lid body 14, and are tightened in the inner and outer diameter directions.

  As shown in FIGS. 1 and 4, an inclined surface (chamfered portion) 19 d is provided at the boundary portion (the entrance side of the end portion 14 e of the lid body 14) between the upper surface 12 a of the base 12 and the outer peripheral surface 19 c of the fitting groove 19. It is formed. Furthermore, inclined surfaces (chamfered portions) 14h and 14i are formed at the end edge portions of the end portion 14e outer peripheral surface 14g and the inner peripheral surface 14f of the lid body 14 respectively. Further, an inclined surface (chamfered portion) 19e is formed at the boundary between the inner peripheral surface 19a of the fitting groove 19 of the base 12 and the bottom surface 20b of the fitting recess 20.

  Further, as shown in FIGS. 1 to 3, a plurality of engagement holes 21 that penetrate to the lower surface 12 c of the base 12 are provided at positions equidistant from the bottom surface 19 b of the fitting groove 19 of the base 12 (in the first embodiment, 3), and an end 14e of the lid body 14 facing each of the engagement holes 21 is integrally formed with a locking claw 22 that is locked to and released from the engagement hole 21. is there. As shown in FIG. 3, each latching claw 22 has a pair of flanges 22b and 22b through a wide slit 22a at the center. The pair of flange portions 22b and 22b are elastically deformed toward the slit 22a, and the tip portions 22c of the flange portions 22b are locked and detached from the step portions 21a of the engagement holes 21. The base 12 and the lid 14 are assembled in the assembly direction Y shown in FIG. 1 by locking the locking claws 22 of the lid 14 in the engagement holes 21 of the base 12. .

  As shown in FIG. 1, a connector portion 23 is integrally formed on the outer side of one side portion of the base 12. The connector portion 23 is provided with terminals 24 that are electrically connected to the plurality of fixed contacts 13 and are connected to terminals of a mating connector (not shown). Further, as shown in FIG. 2, a pair of mounting portions 25, 25 that are screwed and fixed to an automatic transmission (not shown) are integrally formed on the outside of the other side portion of the base 12. A long hole-shaped metal ring 26 is fixed to the center of each of the mounting portions 25 and is reinforced by screwing and fixing.

  Further, as shown in FIG. 1, a bearing hole 12b having a circular cross section is formed at the center of the other side portion of the base 12, and opposed to the bearing hole 12b of the base 12 on the inner surface of the ceiling wall 14a of the lid body 14. An annular bearing convex portion 14b is integrally formed to project at a position where this occurs. A cylindrical shaft portion 15b integrally projecting downward from an end portion of the lower surface 15a of the movable plate 15 is rotatably supported in the bearing hole 12b of the base plate 12, and an annular bearing of the lid body 14 is supported. An annular concave portion 15d formed on the upper surface 15c of the movable platen 15 is rotatably supported on the convex portion 14b.

  A space between the inner peripheral surface of the bearing hole 12 b of the base 12 and the outer peripheral surface of the cylindrical shaft portion 15 b of the movable platen 15 is sealed with an annular packing 27 made of rubber. Further, the tip end portion 29a of the rotary shaft 29 for the automatic transmission having the operation lever 28 fixed therein is fitted and fixed in the cylindrical shaft portion 15b of the movable platen 15.

  As described above, according to the inhibitor switch 10 of the first embodiment, before attaching the lid 14 to the upper surface 12a of the base 12, the rubber-made annular packing 18 is slightly attached to the inner peripheral surface 20a of the fitting recess 20 of the base 12. Set with tension. Next, when the lid body 14 is assembled in the assembly direction indicated by the arrow Y in FIGS. 1 and 4, the cylindrical end portion 14 e of the lid body 14 is fitted into the fitting groove 19 of the base 12. At this time, the cylindrical end portion 14 e is fitted into the fitting groove 19 of the base 12 by the inclined surface 19 d outside the opening of the fitting groove 19 and the inclined surface 14 h outside the cylindrical end portion 14 e of the lid 14. Is easily inserted into and inserted. In addition, the inclined surface 14i on the inner side of the cylindrical end portion 14e of the lid body 14 can reliably prevent the annular packing 18 from being caught in the fitting groove 19 side.

  When the cylindrical end portion 14 e of the lid body 14 is fitted into the fitting groove 19 of the base 12, the annular packing 18 is formed between the inner peripheral surface 14 f of the end portion 14 e of the lid body 14 and the fitting recess 20. The inner peripheral surface 20a is squeezed and tightened in the inner diameter and outer diameter direction (tightening direction X of the packing 18). Thus, the cylindrical end portion 14e of the lid body 14 is reliably prevented from escaping to the outside, and the outer periphery of the inhibitor switch 10, that is, the upper surface 12a of the base 12 and the stepped portion 14d of the lid body 14 by the annular packing 18. The abutment portion of the seal is easily and reliably sealed.

  Further, as shown in FIGS. 1 and 3, when the base 12 and the lid body 14 are assembled, the engaging claws 22 of the end portions 14 e of the lid body 14 are snap-fitted into the respective engaging holes 21 of the base body 12. The base 12 and the lid body 14 are assembled and fixed easily and reliably. In particular, each engagement hole 21 is formed in a part of the bottom surface 19 b of the fitting groove 19 of the base 12, and each locking claw 22 is integrally protruded from a part of the cylindrical end portion 14 e of the lid body 14. Thus, the end 14e of the lid body 14 is fitted into the fitting groove 19 of the base board 12, and at the same time, the locking claws 22 of the lid body 14 are easily and reliably locked in the respective engagement holes 21 of the base board 12. Can do.

  In this way, the fastening direction X of the annular packing 18 and the assembly direction Y of the base 12 and the lid 14 are shifted by 90 °, and the fastening direction X of the annular packing 18 is set to the direction of the inner diameter and the outer diameter. It is possible to avoid concentration of stress on the contact portion and the seal portion between the upper surface 12a of the base 12 and the step portion 14d of the lid body 14.

  In addition, the annular packing 18 is also tightened in the assembling process of the base 12 and the lid 14, so that no man-hour loss occurs. Further, the base 12 and the lid body 14 are easily fixed by snap-fitting each engagement hole 21 of the base board 12 and each locking claw 22 of the end portion 14e of the lid body 14.

  Furthermore, since the sealing property and the fixing strength of the contact portion between the upper surface 12a of the base 12 and the stepped portion 14d of the lid 14 are determined by the accuracy of the parts such as the base 12 and the lid 14, the influence of the assembling apparatus and the like is affected. Hateful. Further, the base 12 and the lid 14 can be disassembled and reassembled, and there is no fear of deterioration in yield.

  Since the rubber-made annular packing 18 is set with tension on the inner peripheral surface 20a of the fitting recess 20 of the base 12, the annular packing 18 is not lifted when the base 12 and the lid 14 are assembled. Furthermore, the biting of the annular packing 18 toward the fitting groove 19 is not caused by the inclined surface 14i inside the end portion 14e of the lid body 14. Moreover, since the fastening force of the annular packing 18 and the assembly (fixation) of the base 12 and the lid 14 are independent, there is no space restriction.

  In addition, conventional ultrasonic welding (1) It is necessary to prepare expensive equipment for ultrasonic welding equipment, (2) The tightness of the packing cannot be determined unless the base and lid are fixed, and (3) In case of malfunction Problems such as difficulty in reproducibility and (4) large loss at the time of development can be easily solved by adopting the first embodiment, and the development period can be greatly shortened.

  In addition, according to the said Example 1, although the edge part of the cover body was inserted in the fitting groove provided in the base | substrate, the fitting end part of the board | substrate was inserted in the fitting groove provided in the cover body. It may be included. In addition, the locking claw provided at the end of the lid body is locked by snap fit to the engagement hole provided in the base, but the locking claw provided in the base in the engagement hole provided in the lid body May be locked by snap-fit. Further, the change-over switch is not limited to the inhibitor switch, and it is needless to say that the first embodiment can be applied to other change-over switches such as a rotary switch and a slide switch.

It is sectional drawing which shows the changeover switch of Example 1 of this invention. It is a bottom view of the changeover switch. It is sectional drawing which follows the EE line in FIG. It is an expanded sectional view of the principal part of the above-mentioned changeover switch. It is a top view of the conventional changeover switch. It is a top view of the board | substrate used for the said conventional changeover switch. It is sectional drawing which follows the FF line in FIG.

Explanation of symbols

10 Inhibitor switch (changeover switch)
11 Switch case 12 Base 13 Fixed contact 14 Lid 14e End 14h, 14i Inclined surface (chamfered part)
15 Movable platen 16 Movable contact point 18 Annular packing 19 Fitting groove 19d Inclined surface (chamfered portion)
21 Engaging hole 22 Locking claw X Packing tightening direction Y Assembly direction of base and lid

Claims (3)

A switch case is constituted by a base having a plurality of fixed contacts and a lid body that is assembled so as to abut on the periphery of the base and forms a sealed internal space. The plurality of fixed contacts are formed in the switch case. A movable platen having a movable contact that slides on the contact and switches the contact is disposed, and an annular packing that seals a contact portion between the base and the lid is interposed between the base and the lid. In the seal structure of the selected changeover switch,
A sealing structure for a changeover switch, characterized in that the direction of tightening the annular packing between the base and the lid is perpendicular to the direction in which the base and the lid are assembled. The seal structure of the changeover switch according to claim 1,
One of the base and the lid is provided with an engagement hole, and the other is provided with a locking claw that is locked to and released from the engagement hole, so that the base and the lid can be assembled freely. The switch switch seal structure. The seal structure of the changeover switch according to claim 1,
One of the base and the lid is provided with a fitting groove, and the other is provided with an end fitted into the fitting groove, and the annular packing is assembled to the base and the lid through the end. A switch switch seal structure characterized in that it can be tightened in a direction perpendicular to the direction.

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