JP2008089101A - Electric component sealing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure sealing performance corresponding to a grooved portion in a special shape while reducing an increase in manufacturing cost. <P>SOLUTION: This sealing member 10 is fitted into the grooved portion 38 of a casing 30 of an electric component such as an EGR valve position sensor. It comprises an annular body having elasticity, and a cut portion 11 formed at the outer edge of the annular body along the annular body. With the cross section of the annular body contracted corresponding to the shape of the grooved portion 38, the annular body is closely adhered to the grooved portion 38 to secure the sealing performance corresponding to the grooved portion in the special shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sealing member for an electrical component, and more particularly, to a sealing member for an electrical component that requires airtightness such as an EGR (Exhaust Gas Recirculation) valve position sensor mounted on an automobile or the like.

  2. Description of the Related Art Conventionally, sensor devices mounted on automobiles, motorcycles, and the like have been required to be sealed in order to prevent intrusion of water droplets, exhaust gas, and the like accompanying traveling. In order to meet such a demand, in the sensor device, for example, a sealing member such as an O-ring is fitted into a groove formed in the casing of the sensor device to ensure sealing (for example, Patent Document 1). reference).

In such a sensor device, when the groove portion formed in the casing is non-circular, a special shape corresponding to the groove portion is usually used because a general O-ring cannot secure a sufficient sealing performance. The sealing member (deformation O ring) which has this is manufactured, and airtightness is ensured.
JP 7-55004 A

  However, since the sealing member having the special shape as described above needs to be manufactured only for the sensor device to be fitted, there is a problem that the manufacturing cost increases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electrical component sealing member capable of ensuring hermeticity corresponding to a groove having a special shape while reducing an increase in manufacturing cost. And

  The sealing member for an electrical component according to the present invention is a sealing member that is fitted into a groove formed in a casing of the electrical component, and has a stretchable annular body and an outer edge portion of the annular body along the annular body. And a notch formed.

  According to the sealing member of the electrical component, since the notch is formed along the annular body at the outer edge of the stretchable annular body, the annular body can be contracted according to the shape of the groove formed in the casing. Therefore, the annular body can be brought into close contact with the groove portion, and it becomes possible to ensure sealing performance corresponding to the special-shaped groove portion. Moreover, since it is only necessary to form a cut along the annular body at the outer edge portion of the annular body, it is not necessary to manufacture a seal member having a special shape, and an increase in manufacturing cost can be reduced.

  In the sealing member of the electrical component, it is preferable that the notches are formed at a plurality of locations on the outer edge of the annular body. In this case, since the contraction width of the annular body corresponding to the shape of the groove formed in the casing can be increased, the annular body can be more closely attached to the groove.

  In particular, in the sealing member of the electrical component, it is preferable to form a pair of the cuts at opposing positions on the outer edge of the annular body. In this case, since the fitting operation can be performed without worrying about the direction of the annular body, it is possible to improve the working efficiency when fitting the seal member into the casing.

  Moreover, in the sealing member of the electrical component, it is preferable that the shape of the cut is a V shape. In this case, when fitted into the groove of the casing, the V-shaped opening can be closed according to the shape of the groove formed in the casing, so that the annular body can be efficiently contracted. .

  Furthermore, the sealing member for the electrical component may be fitted into a non-circular groove formed in the casing. Thus, even when fitted in a non-circular groove portion, the annular body contracts according to the shape of the non-circular groove portion, so that the annular body can be brought into close contact with the groove portion, Correspondingly, it becomes possible to ensure sealing performance.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the sealing member of the electrical component which can ensure sealing | tightness corresponding to the groove part of a special shape, reducing the raise of manufacturing cost.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a front view of a sealing member for an electrical component according to the present embodiment. 2 is a cross-sectional view taken along one-dot chain line AA shown in FIG.

  The sealing member 10 of the electrical component according to the present embodiment is configured by an annular body having elasticity. The seal member 10 is formed of, for example, a rubber material and has an annular shape as shown in FIG. For example, the seal member 10 is used to ensure the sealing performance of electrical parts such as an EGR valve position sensor mounted on an automobile or the like. Specifically, the sealing of the electrical component is ensured by being fitted into a groove formed in the casing of the electrical component such as an EGR valve position sensor.

  In the present embodiment, the case where the seal member 10 is formed of a rubber material will be described. However, the material of the seal member 10 is not limited to this, and can be appropriately changed. For example, it may be formed of a plastic material or the like on the condition that it has characteristics such as a certain degree of stretchability and heat resistance.

  Moreover, in this Embodiment, although shown about the case where the sealing member 10 has a ring shape, about the shape of the sealing member 10, it is not limited to this but can be changed suitably. For example, various electric parts such as a rectangular shape may have a general-purpose shape.

  As shown in FIG. 2, the seal member 10 according to the present embodiment has a substantially circular cross section, and a cut portion 11 is formed at a fixed position on the outer peripheral surface thereof. In particular, in the present embodiment, as shown in FIG. 2, a pair of cut portions 11 are formed at positions on the outer peripheral surface of the seal member 10 that face each other in the vertical direction. In particular, the cut portion 11 has a V-shaped cross section.

  When the sealing member 10 is fitted in a groove formed in the casing of the electrical component, the cut portion 11 contracts the sealing member 10 (cross section thereof), thereby bringing the sealing member 10 into close contact with the groove of the casing. This improves the sealing performance. That is, when fitted in the groove formed in the casing, the notch 11 is appropriately deformed according to the shape of the groove, so that the seal member 10 is in close contact with the shape of the groove, and the sealing performance in the casing is improved. It becomes.

  In addition, in this Embodiment, although shown about the case where a pair of notch part 11 is formed in the outer peripheral surface of the sealing member 10, it is not limited to this and the quantity of the notch part 11 is suitably It can be changed. For example, one cut portion 11 may be formed on the outer peripheral surface of the seal member 10, or three or more cut portions 11 may be formed. When a plurality of the cut portions 11 are formed on the outer peripheral surface of the seal member 10, the contraction width of the seal member 10 can be increased according to the shape of the groove portion formed in the casing, so that the seal member is more closely attached to the groove portion. It becomes possible.

  Moreover, in this Embodiment, although shown about the case where the shape of the notch part 11 has V shape, it is not limited to this and the shape of the notch part 11 can be changed suitably. For example, as described later, the seal member 10 may have a shape such as a U shape on condition that the cross section of the seal member 10 is appropriately contracted.

  FIG. 3 is a cross-sectional view of a conventional seal member (O-ring). As shown in FIG. 3, the conventional seal member 20 has a circular cross section. For this reason, when the sealing member 20 is fitted in the groove formed in the casing of the electrical component, the sealing member 20 (cross section) is appropriately selected according to the shape of the groove as in the sealing member 10 according to the present embodiment. The amount of deformation is small. Therefore, it does not become the state closely_contact | adhered to the shape of the groove part, but the airtightness in a casing is low compared with the sealing member 10 which concerns on this Embodiment.

  FIG. 4 is a front view showing a state in which the seal member 10 according to the present embodiment is fitted in a groove formed in the casing of the EGR valve position sensor. In addition, in FIG. 4, although demonstrated using the position sensor for EGR valves as an example of the electrical component by which the sealing member 10 which concerns on this Embodiment is fitted, about the electrical component by which the sealing member 10 is fitted, It is not limited to this, and can be changed as appropriate. The EGR valve position sensor is mounted on an automobile or the like, and detects the position of the EGR valve. Since its configuration is well known, its detailed description is omitted.

  In the EGR valve position sensor shown in FIG. 4, a casing 30 made of an insulating material such as synthetic resin, and a lid (not shown) that covers the front surface of the casing 30 and is also made of an insulating material such as synthetic resin. ), And an operation shaft 31 that is slidably inserted in the axial direction in shaft holes provided in the center of the casing 30 and the lid.

  A holding portion 33 that holds a pair of elastic members 32 for positioning the lid and preventing vibration of the lid is formed on the side of the operation shaft 31. In addition, an insulating substrate 34 to which a resistor is fixed is disposed along the axial direction of the operation shaft 31 below the operation shaft 31. A connection clip 35 connected to a resistor is attached to the upper end of the insulating substrate 34. The connection clip 35 is electrically connected to one end of an L-shaped connector terminal 36 embedded in the casing 30. On the other hand, the other end of the terminal 36 is exposed in the opening of the cylindrical portion 37.

  A movable member (not shown) that is attached to the operation shaft 31 and moves along with the movement of the operation shaft 31 is disposed inside the casing 30, and a slide made of a metal plate is provided below the movable member. A mover is attached. The movable member to which the slider is attached is attached to the casing 30 so as to be slidable in a state where the slider is in contact with the resistor. A detection signal of the position sensor for the EGR valve corresponding to the position of the slider in the resistor is output via the terminal 36 to the EGR valve device that controls the position of the EGR valve.

  In the casing 30 shown in FIG. 4, a groove portion 38 is formed around the holding portion 33 and the terminal 36. In addition, recessed portions 39 a and 39 b that assist in fitting the seal member 10 into the groove portion 38 or removing the seal member 10 from the groove portion 38 are formed on a part of the outer peripheral side of the groove portion 38.

  Here, the groove part 38 formed in the casing 30 shall have a non-circular shape as shown in FIG. Specifically, three linear portions 38a, 38b and 38c arranged in the lower region shown in FIG. 4 are connected to the arc-shaped portion 38d to form a non-circular groove portion 38.

  As described above, conventionally, in order to fit the seal member into such a non-circular groove portion 38 to ensure the sealing performance of the EGR sensor, a dedicated seal member must be manufactured only for the groove portion 38. did not become. However, in the sealing member 10 according to the present embodiment, even when the sealing member 10 is fitted in such a non-circular groove portion 38, the cut portion 11 is appropriately deformed according to the shape of the groove portion 38. Is in close contact with the shape of the groove portion 38, and it is possible to improve the sealing performance of the position sensor for the EGR valve.

  Thus, according to the sealing member 10 of the electrical component according to the present embodiment, since the cut portion 11 is formed along the annular body constituting the sealing member 10, the shape of the groove portion 38 formed in the casing 30 is obtained. Accordingly, since the seal member 10 can be contracted, the seal member 10 can be brought into close contact with the groove portion 38, and the sealing performance can be ensured corresponding to the special-shaped groove portion. Further, since it is only necessary to form the cut portion 11 along the annular body constituting the seal member 10, it is not necessary to manufacture a seal member having a special shape, and it is possible to reduce an increase in manufacturing cost.

  In particular, in the sealing member 10 of the electrical component according to the present embodiment, a pair of cut portions 11 are formed at opposing positions on the outer peripheral surface of the annular body constituting the sealing member 10. Thereby, since the fitting operation | work to the casing 30 can be performed without minding the direction of the sealing member 10, it becomes possible to improve the working efficiency at the time of fitting the said sealing member 10 in the casing 30. FIG.

  Moreover, in the sealing member 10 of the electrical component which concerns on this Embodiment, the shape of the cut | notch part 11 is made into V shape. Thereby, when fitted in the casing 30, the V-shaped opening can be closed in accordance with the shape of the groove 38 formed in the casing 30, so that the annular body constituting the seal member 10 is efficiently contracted. It becomes possible.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

It is a front view of the sealing member of the electrical component which concerns on this Embodiment. It is sectional drawing in the dashed-dotted line AA shown in FIG. It is sectional drawing of the conventional sealing member (O-ring). It is a front view which shows about the state which fitted the sealing member of the electrical component which concerns on the said embodiment in the groove part formed in the casing of an EGR sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seal member 11 Cut part 30 Casing 31 Operation shaft 38 Groove part

Claims (5)

  A sealing member that is fitted into a groove formed in a casing of an electrical component, and includes a ring body having elasticity, and a cut formed along the ring body at an outer edge portion of the ring body. An electrical component sealing member characterized by the above.   The sealing member for an electrical component according to claim 1, wherein the cuts are formed at a plurality of locations on an outer edge of the annular body.   The sealing member for an electrical component according to claim 2, wherein a pair of the cuts are formed at opposing positions on the outer edge of the annular body.   The sealing member for an electrical component according to any one of claims 1 to 3, wherein the cut shape is a V-shape.   The sealing member for an electrical component according to any one of claims 1 to 4, wherein the sealing member is fitted into a non-circular groove formed in the casing.

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