JP2009121635A - Resin casting structure of bolt or nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent co-rotation of a bolt or a nut, even if high torque is applied to the bolt or the nut embedded in the resin molding, when installing the resin molding, and thereby to install a resin molding without severely managing torque. <P>SOLUTION: A resin casting structure of a bolt or a nut is molded by casting a spanner hooking part of the bolt or the nut in resin when forming the resin molding. Hard resin molding bodies 14 and 24 of diametrically expanding an outer diameter of the spanner hooking part by a hard resin 13, are constituted by casting the spanner hooking parts 22a and 12a of the bolt 22 or the nut 12 in the resin 13 harder than the resin molding 7a, and the resin molding 7a is molded by casting the hard resin molding bodies in the resin. At least one of a recessed part 13c or a projection part 13d is desirably formed on an interface surface with the resin molding 7a of the hard resin molding bodies 14 and 24, or on an interface surface with the hard resin molding bodies 14 and 24 of the bolt 22 or the nut 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cast structure that can eliminate rotation of a bolt or nut even when a large torque is applied to the bolt or nut in a resin molded product in which a fastening part such as a bolt or nut is cast in resin.

  FIG. 9 is a schematic side view of a vehicle such as a truck. In FIG. 9, an air cleaner 3 for supplying air to an engine (not shown) is disposed on the rear side of the cab 2 of the vehicle 1 at one side lower side in the vehicle width direction, and an intake duct 4 connected to the air cleaner 3 is erected. The intake hood 5 is covered on the upper end of the intake duct 4. This prevents water such as rain from entering the intake duct 4.

  Outside air is sucked from an opening formed on the lower surface side of the intake hood 5 and guided to the intake duct 4, filtered by the air cleaner 3, and supplied to the engine as clean air. A temperature sensor or an air flow rate sensor is attached to the inlet-side or outlet-side air flow path of the air cleaner 3.

  In order to attach a resin molded product to a vehicle body or the like, a resin molded product may be manufactured by casting fastening parts such as bolts or nuts as attachment means to the vehicle body into the resin. Further, in order to attach the temperature sensor to the resin molded product, the temperature sensor may be fastened and fixed to a nut cast in the resin. However, if a large tightening torque is applied to the bolt or nut when the resin molded product is attached, the resin material is soft and the resin material around the bolt or nut is deformed, causing the cast bolt or nut to rotate. This causes a problem that it cannot be attached.

  In Patent Document 1 (Japanese Patent Publication No. 48-19822), for example, a hanger board, a wall plate, a ceiling plate, a floor plate, etc. composed of a rigid resin plate made of artificial wood, styrofoam or the like, a plywood plate, etc. A coupling fitting for attaching an attachment member such as another plate-like object or instrument is disclosed. In this coupling metal fitting, an insert metal fitting is embedded in a mounting plate so that the attachment member can be easily attached via the insert metal fitting and the attachment member is prevented from falling off. .

  Patent Document 2 (Japanese Patent Laid-Open No. 5-58281) discloses a ground coil mounting structure laid on a track such as a superconducting magnetic levitation railway. In this mounting structure, when a ground coil is mounted on a track side wall made of concrete or the like, a hollow cylindrical insert member having an internal thread formed on the inner surface is embedded, and a mounting bolt for mounting the ground coil on the track side wall is attached to the insert member. The ground coil is attached to the side wall of the track by screwing.

Japanese Patent Publication No. 48-19822 JP-A-5-58281

  The coupling fitting disclosed in Patent Document 1 is a fitting with a latching leg member having a number of latching legs at the lower end portion on the outside of the insert fitting, and the latching legs are made to follow the inclined surface of the insert fitting. Thus, the insert fitting is prevented from falling off by being pierced into the wall surface of the mounting plate. This mounting structure has a problem that the processing of the latching foot member having a plurality of latching feet is troublesome, and it takes time to manufacture the latching foot member, resulting in high costs.

  Moreover, since the mounting structure of the magnetic levitation railway ground coil disclosed in Patent Document 2 has a hollow cylindrical insert member embedded in a hard track side wall made of concrete or the like, there is no problem of accompanying rotation. A disk-shaped protrusion is formed on the outer peripheral surface of the insert member. Since the disk-shaped protrusion is arranged in a direction perpendicular to the axial direction of the insert member, it has a function of preventing the removal, but a function of preventing the rotation. There is no.

  When a nut or bolt is directly inserted into a resin molded product, the nut or bolt is made of metal and is not fixed to the resin and is physically fixed. Therefore, although the spanner hooking part is caught in the rotation direction, it does not rotate, but the resin molded product is molded from a relatively soft polyolefin-based resin. The molded product is destroyed and causes rotation.

  As described above, conventionally, when a tightening torque is applied to a bolt or nut embedded in a flexible resin molded product, in order to prevent the bolt or nut from rotating, and further, the bolt or nut is prevented from falling off. Therefore, it is necessary to tighten the torque management so that the torque applied to the bolt or nut spanner hanging portion does not become excessive.

  In view of the problems of the prior art, the present invention provides a set torque after temporarily tightening a fastening portion to be screwed when a tightening torque is applied to a bolt or a nut embedded in the resin molded product at the time of mounting the resin molded product. Even if a tightening operation similar to other component mounting operations is performed during the temporary tightening operation, the deformation of the resin material around the bolt or nut is eliminated and the rotation of the bolt or nut is prevented. An object of the present invention is to enable mounting of a resin molded product or mounting of a component to the resin molded product without strict torque management.

In order to achieve such an object, the resin casting structure of the fastening part of the present invention is:
In the resin cast structure of bolts or nuts, in which a spanner hook of bolts or nuts is cast in the resin when forming the resin molded product,
Bolt or nut spanner hooks are cast into a harder resin than the resin molded product, and a hard resin molded body is formed by expanding the outer diameter of the spanner hooks with the hard resin. It is formed by casting a resin molded product.

  In the manufacturing process of the resin casting structure of the present invention, first, a hard resin molded body is formed by casting a spanner portion of a bolt or a nut into a hard resin. The hard resin molded body has an outer diameter larger than that of the bolt or nut. Thereafter, the hard resin molded body is cast into a resin material to produce a resin molded product.

  With this cast-in structure, the spanner hanging portion of the bolt or nut is hardened with a hard resin molded body made of a hard material. As a result, the tightening torque applied to the bolt or nut when the resin molded product is attached or when other parts are attached to the resin molded product is transmitted to the resin molded product via the hard resin molded product. Since the strength of the resin molded body is greater than the resin material constituting the surrounding resin molded product, deformation and peeling from the bolt or nut hardly occur at the joint surface with the bolt or nut.

  In addition, the area of the joint surface between the hard resin molded body and the resin molded product is increased by expanding the diameter of the hard resin molded body. Therefore, the resin molded product per unit area of the joint surface is increased. The tightening torque transmitted to is reduced. As a result, the limit torque with which the bolt or nut can be rotated is improved.

Therefore, even if a slightly higher tightening torque is applied during the temporary tightening operation, deformation of the resin molded product and separation of the resin molded product from the bolt or nut do not occur. Can be prevented. Therefore, the reliability with respect to the bolt or nut mounting structure of the resin molded product is improved, and it is not necessary to perform strict torque management during the temporary tightening work as in the prior art, and the tightening work can be performed smoothly.
In addition, by casting the bolt or nut into the hard resin molded body as a previous step, the metal bolt or nut is reliably cast, so that the airtightness of the mounting portion can be improved, and this also improves the bolt or nut. The drop prevention effect can be improved.

  In the structure of the present invention, it is preferable that at least one of a concave portion or a convex portion is formed on the hard resin molded body on the joint surface between the hard resin molded body and the resin molded product. As a result, the joint strength in the torque application direction and the axial direction of the bolt or nut increases at the joint surface, so that it is possible to further improve the effect of preventing the rigid resin molded body from rotating and preventing the resin molded product from falling off. .

  Moreover, it is good to form at least one of a recessed part or a convex part in the said bolt or nut of the joining surface of a volt | bolt or a nut and a hard resin molding. As a result, the joint strength in the torque application direction and the axial direction of the bolt or nut increases at the joint surface, so that the effect of preventing the bolt or nut from rotating with respect to the hard resin molded body and the drop-off preventing effect can be further improved. .

  In addition, if a temperature sensor with a male screw threaded into the cast nut and a sensor terminal inserted in the center is fastened and fixed to the nut, the various sensors can be securely attached to the resin molded product. In addition, the effect of preventing various sensors from dropping off can be improved.

  According to the resin cast structure of the fastening part of the present invention, in the resin cast structure of the bolt or nut in which the bolt or nut spanner hanging portion is cast in the resin when forming the resin molded product, it is harder than the resin molded product. A bolt or nut spanner hook is cast into the resin, and a hard resin molded body is formed by expanding the outer diameter of the spanner hook with the hard resin, and the hard resin molded body is cast into the resin. The molded product is molded, and thereby, it is possible to improve the limit torque of the bolt or the nut when the resin molded product is attached. Therefore, the reliability with respect to the bolt or nut mounting structure to the resin molded product is improved, and the mounting operation of the resin molded product can be performed smoothly.

  In the present invention, the hard resin molded body is preferably made of a polyolefin-based resin such as “PP glass fiber” (a reinforcing material obtained by adding glass fiber to polypropylene resin) as a base material. For example, resin molded products such as air cleaners, ducts, and tanks are also molded from polyolefin resin such as polypropylene.

  Hard resin moldings can be fixed to nuts or bolts without being damaged even by large torque, and are fixed to resin molded products by welding on the expanded joint surface. Can do. Since the hard resin molded body and the resin molded product are fixed by welding, the outer periphery of the hard resin molded body is preferably circular. This is a preferable aspect in terms of molding because the surroundings of the resin are good when the hard resin molding is cast.

  Further, since the metal bolt or nut is surely cast into the resin molded product, the airtightness of the bolt or nut mounting portion is improved. Further, the strength of the cast boss portion of the bolt or nut can be increased, and cracks of the cast boss portion due to excessive tightening of the bolt or nut can be prevented.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

(Embodiment 1)
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of an air cleaner installation portion attached to a vehicle body. In FIG. 1, the lower end of the intake duct 4 shown in FIG. 9 is connected to an air box 7 via a bellows 6. Air separated from the air in the air box 7 is sucked into the air cleaner 3 through the air cleaner inlet pipe 8.

  Air cleaned by removing dust and water by the air cleaner element housed inside the air cleaner 3 is discharged to the air cleaner outlet pipe 9. Thereafter, clean air is supplied from an air cleaner outlet pipe 9 to an engine (not shown).

  A temperature sensor 10 that detects the temperature of the air flowing through the air box 7 is attached to the air box 7. The air cleaner outlet pipe 9 is attached with a flow rate sensor 11 for detecting the flow rate of clean air flowing through the air cleaner outlet pipe 9. Hereinafter, the configuration of the temperature sensor 10 will be described with reference to FIG. 2A is a longitudinal sectional view of a mounting part for screwing the temperature sensor 10, FIG. 2B is a longitudinal sectional view of the temperature sensor 10, and FIG. 2C is a cross section taken along the line AA in FIG. FIG.

  In FIG. 2A, the embedded nut 12 is composed of a spanner hanging portion 12a made of a prism having a hexagonal cross section and a disk-like flange 12b fixed to the lower surface of the spanner hanging portion 12a. A hard resin is molded from the resin molded product 7 a (see FIG. 2B) around the embedded nut 12 to form a hard resin molded body 14 in which the hard resin portion 13 is covered around the embedded nut 12. The hard resin portion 13 can be made of, for example, a material in which PP glass fiber or talc is mixed to increase the strength, or FRP, bakelite, or the like.

  As a result, the periphery of the embedded nut 12, in particular, the spanner hanging portion 12 a is covered with the hard resin portion 13. The hard resin molded body 14 is formed with a diameter-expanded portion 13b that expands outward through a wedge-shaped step portion 13a so as to match the large-diameter shape of the flange 12b of the embedded nut 12. Further, the upper surfaces of the embedded nut 12 and the hard resin portion 13 are formed so as to have the same height.

  Next, a resin is coated and formed around the hard resin molded body 14 shown in FIG. 2A by injection molding, whereby the mounting portion of the temperature sensor 10 is attached to the resin molded product 7a constituting the partition of the air box 7. Form. As shown in FIG. 2B, an attachment hole 7b and a resin boss portion 7c are formed in the attachment portion so that the upper surface of the hard resin molded body 14 and the upper surface of the resin boss portion 7c are at the same height. Composed. The temperature sensor 10 includes a bolt portion 15 in which a male screw is formed, and a bolt head portion 16 having a hexagonal cross-sectional shape fixed integrally to the bolt portion 15.

  Then, the bolt portion 15 is screwed through the washer 19 to the female screw portion formed in the through hole formed in the axial direction in the center portion of the embedded nut 12. A through hole is bored in the axial direction in the bolt portion 15, and a sensor probe 17 is inserted into the through hole, and the tip end of the sensor probe 17 is fixed in a state of protruding from the through hole. In this state, the bolt head 16 is rotated by putting a tool such as a spanner on the bolt head 16. The bolt head 16 is tightened and fixed until it is pressed against the upper surface of the hard resin molded body 14 via the washer 19 while applying a tightening torque to the bolt head 16 with the tool.

Thus, the attachment of the temperature sensor 10 is completed, and the temperature of the air flowing through the air box 7 can be detected by the sensor probe 17. A cable 18 is connected to the sensor probe 17 and transmits a detection signal of the sensor probe 17 to a control device (not shown).
In addition, as shown in FIG.2 (c), the outer peripheral surface of the enlarged diameter part 13b of the hard resin part 13 forms the recessed part 13c and the convex part 13d alternately by providing the convex part 13d further outward, As a result, the joint strength between the resin molded product 7a and the hard resin molded body 14 increases the joint strength in the torque applying direction and the axial direction of the bolts 15. Therefore, the anti-rotation effect of the hard resin molded body 14 on the resin boss 7c and The drop prevention effect can be improved.

  According to the present embodiment, since the hard resin portion 13 is formed outside the embedded nut 12, even if the tightening torque by the bolt head 16 is applied to the hard resin portion 13 via the embedded nut 12, the embedded nut Thus, deformation or peeling of the hard resin portion 13 in the vicinity of the joint surface between the hard resin portion 12 and the hard resin portion 13 is less likely to occur. Therefore, even if a high tightening torque is applied, the embedded nut 12 can be prevented from rotating.

  Further, in the joint surface between the hard resin molded body 14 and the resin boss portion 7c, the area of the joint surface is increased due to the expansion of the diameter of the hard resin molded body 14, and accordingly, the unit of the joint surface The tightening torque transmitted to the resin boss portion 7c per area is reduced. As a result, the limit torque with which the bolt or nut can be rotated is improved.

  Further, since the enlarged diameter portion 13b is formed on the outer peripheral surface of the hard resin molded body 14 via the wedge-shaped step portion 13a, the bolt axial direction is formed at the joint portion between the hard resin molded body 14 and the resin boss portion 7c. It is possible to increase the bonding strength. At the same time, the amount of transmission torque per unit area of the enlarged diameter portion 13b can be further reduced.

  Moreover, since the recessed part 13c and the convex part 13d are provided in the outer peripheral surface of the hard resin molding 14, the joint strength of a bolt axial direction and a torque provision direction can further be increased. Thereby, deformation or peeling of the resin boss portion 7c in the vicinity of the joint portion between the hard resin molded body 14 and the resin boss portion 7c can be prevented.

  Thus, it is possible to prevent the embedded nut 12 or the hard resin molded body 14 from being rotated when the bolt head 16 is tightened. This eliminates the need for tightening management during the temporary tightening operation, so that the temperature sensor 10 can be mounted smoothly, and the temperature sensor 10 can be stably mounted to the mounting portion, possibly causing the temperature sensor to drop off. Can be wiped off.

  Further, since the metal embedded nut 12 is once embedded in the hard resin portion 13 to form the hard resin molded body 14, and the hard resin molded body 14 is further embedded in the resin boss portion 7c, the embedded nut 12 is fixed. In addition to being able to cast accurately at the position, it is possible to ensure airtightness at the temperature sensor mounting portion. Furthermore, it is possible to increase the strength of the resin boss portion 7c and prevent the resin boss portion 7c from cracking.

  In addition, in this embodiment, although the recessed part 13c and the convex part 13d were formed in the outer peripheral surface of the hard resin molding 14, you may provide only one of the recessed part 13c or the convex part 13d.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the present invention is applied to the fastening between the resin molded product 7a, which is a fastened member, and the other fastened product 21. In FIG. 3, members or devices having the same reference numerals as those in the first embodiment are the same members or devices as those in the first embodiment, and description thereof is omitted.

  In FIG. 3, the fastening bolt 22 has a head 22a having a hexagonal cross-sectional shape and a flange 22b having a diameter larger than that of the head 22a below the head 22a. First, the head portion 22a and the flange 22b of the fastening bolt 22 are cast into hard resin, and the hard resin molded body 24 in which the head portion 22a and the flange 22b of the fastening bolt 22 are covered with the hard resin portion 13 is formed. The upper surface of the head portion 22a and the upper surface of the hard resin portion 13 have the same height, and the lower portion of the hard resin molded body 24 is wedge-shaped in accordance with the shape of the flange 22b, as in the first embodiment. An enlarged diameter portion 13b is formed through the step portion 13a.

  Next, the hard resin molded body 24 is cast into the resin boss portion 7c of the resin molded product 7a to form the bolt fastening portion shown in FIG. That is, the fastening bolt 22 is disposed so as to pass through the mounting hole 7b formed in the resin boss portion 7c of the resin molded product 7a and the mounting hole 21a formed in the other fastened product 21. Then, the tightening nut 23 is screwed into the fastening bolt 22 via the washer 25, and further, a tightening torque is applied to the tightening nut 23 to be crimped to the surface of the component 21 to be fastened. In addition, although not shown in figure, the uneven | corrugated | grooved part similar to the recessed part 13c shown in FIG.2 (c) and the convex part 13d is formed in the outer peripheral surface of the enlarged diameter part 13b of the hard resin part 13. FIG.

  According to this embodiment, since the head portion 22a of the fastening bolt 22 is cast and formed on the resin boss portion 7c of the resin molded product 7a via the hard resin molded body 24, the tightening torque by the tightening nut 23 is the same as that of the bolt 22. Even if transmitted to the head portion 22a, the head portion 22a of the bolt 22 and the hard resin molded body 24 do not rotate with the tightening nut 23 for the same reason as in the first embodiment. Moreover, the same effect as 1st Embodiment can be acquired, such as the intensity | strength increase of the resin boss | hub part 7c being enabled, and the crack generation | occurrence | production of the resin boss | hub part 7c being prevented.

(Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to FIG. The present embodiment is an embodiment showing an attachment structure in which an embedded nut 12 applied to a use different from the first embodiment or the second embodiment is embedded in a hard resin molded body 14. In FIG. 4, members or devices having the same reference numerals as those in the first embodiment are the same members or devices as those in the first embodiment, and description thereof is omitted. As shown in FIG. 4A, a female screw portion 12c is formed in a through hole formed in the center of the embedded nut 12 in the axial direction.

  The embedded nut 12 can be used as a part of fastening means using a bolt, for example. That is, in FIG. 4, the component 21 to be fastened is brought into contact with the resin molded product 7 a, and the fastening bolt 26 is screwed into the female screw portion 12 c formed on the embedded nut 12 through the washer 25 from above. Then, a tightening torque is applied to the spanner hanging portion 26 a having a hexagonal cross section of the bolt 26, and the bolt 26 is fastened and fixed to the component 21 to be fastened. According to this embodiment, even if the tightening torque applied to the bolt 26 is transmitted to the embedded nut 12, the accompanying rotation of the embedded nut 12 and the hard resin molded body 14 is prevented for the same reason as in the first embodiment. be able to.

(Embodiment 4)
FIG. 5 shows a modification of the shape of the flanged embedded nut 12 according to the first embodiment shown in FIG. 2, the second embodiment shown in FIG. 3, and the third embodiment shown in FIG. In FIG. 5, the embedded nut 30 includes a spanner hanging portion 31 having a hexagonal cross section, and a flange 32 having a larger diameter than the spanner hanging portion 31 below the spanner hanging portion 31. And as shown to Fig.5 (a), the internal thread part 33 is formed in the through-hole drilled by the axial direction at the center.

In the embedded nut 30 of the present embodiment, the flange 32 has a cut surface c ₁ and the hatched portion a ₁ is cut off. Thereby, a part of the outer shape of the flange 32 is not an arc shape but a square shape. Therefore, the joint strength in the embedded nut axial direction and the joint strength in the torque applying direction can be increased at the joint portion between the embedded nut 30 and the hard resin molding (not shown) joined to the outer peripheral surface of the embedded nut 30.

(Embodiment 5)
FIG. 6 shows another modification of the embedded nut. In FIG. 6, the embedded nut 30 has the same configuration as the embedded nut 30 of FIG. 5, but by cutting off the hatched portion a ₂ at a cutting plane c ₂ different from that of the fourth embodiment, a groove-like recess is formed in the flange 32. Is provided. Other configurations are the same as those of the fourth embodiment.

  Also in the present embodiment, the joint strength between the embedded nut 30 and the hard resin molded body (not shown) joined to the outer peripheral surface of the embedded nut 30 is increased in the joint strength in the axial direction of the embedded nut and in the torque application direction. Can do.

FIG. 7 shows still another modification of the shape of the embedded nut. In FIG. 7, the embedded nut 40 is an embedded nut having no flange below the spanner hanging portion 41. The embedded nut 40 has a spanner hooking portion 41 having a hexagonal cross section, a through hole is formed in the axial direction at the center, and a female screw portion 42 is formed in the through hole. Then, it is made by cutting the hatched portion a ₃ a wrench hold portion 41 at the cut surface c _3.

Further, the embedded nut 50 shown in FIG. 8 is a modified example having another shape. The embedded nut 50 has a through hole formed in the axial direction at the center, and a female screw portion 52 is formed in the through hole. In addition, the hatched portion a ₄ is cut off at the cut surface c ₄ , and the two sides 53 and 54 of the spanner hanging portion 51 extend outward. As a result, the spanner hanging part 51 is formed of four sides including 53 ′ and 54 ′ and a cut surface c4, and the sides have different lengths.

  7 and FIG. 8 is a hard resin molding (not shown) that covers the embedded nut 40 or 50 and the outer peripheral side thereof by making the shape of the spanner hanging portion 41 or 51 asymmetrical from the center. The joint strength in the direction of torque application can be increased at the joint with the body. As a result, the effect of preventing the accompanying rotation of the embedded nut 40 or 50 during tightening can be improved.

  According to the present invention, when a tightening torque is applied to a tightening member that is screwed into a bolt or a nut embedded in the resin molded product when the resin molded product is attached, the set torque is applied after the temporary tightening. Even if the same tightening work as other parts mounting work is performed during tightening work, the rotation of the bolts or nuts is prevented, and as a result, resin molded products that do not require tightening management during temporary tightening work can be installed. Make it possible.

It is a perspective view of the air cleaner installation part attached to the vehicle body. The present invention relates to a first embodiment in which the present invention is applied to the mounting of a temperature sensor. (A) is a longitudinal sectional view of a hard resin molded body, (b) is a longitudinal sectional view of a temperature sensor mounting portion, and (c) is a diagram (b). It is a cross-sectional view which follows the AA line in the inside. It is a longitudinal cross-sectional view which concerns on 2nd Embodiment of this invention. FIG. 5A is a cross-sectional view taken along line BB in FIG. 5B, and FIG. 5B is a vertical cross-sectional view of an embedded nut installation portion according to a third embodiment of the present invention. FIG. 4A is a plan view of an embedded nut according to a fourth embodiment of the present invention, and FIG. 5B is an elevation view of the embedded nut. FIG. 7A is a plan view of an embedded nut, and FIG. 5B is an elevation view of the embedded nut according to a fifth embodiment of the present invention. It is a top view of the embedded nut which concerns on the modification of the said 4th Embodiment or 5th Embodiment. It is a top view of the embedding nut which concerns on another modification of the said 4th Embodiment or 5th Embodiment. It is a side view schematic diagram of vehicles, such as a truck.

Explanation of symbols

7 Air box 7a Resin molded product 7c Resin boss part 10 Temperature sensor 12, 30, 40, 50 Embedded nut 12a, 41, 51 Spanner hook part 13 Hard resin part 13a Wedge shaped step part 13b Expanded part 13c Concave part 13d Convex part 14 , 24 Rigid resin molding 15 Bolt 16 Sensor probe 22 Fastening bolt 22a Bolt head

Claims (4)

In the resin cast structure of bolts or nuts, in which a spanner hook of bolts or nuts is cast in the resin when forming the resin molded product,
Bolt or nut spanner hooks are cast into a harder resin than the resin molded product, and a hard resin molded body is formed by expanding the outer diameter of the spanner hooks with the hard resin. A bolt or nut resin cast structure, wherein the resin molded product is molded by casting inside.   2. The bolt or nut resin casting according to claim 1, wherein at least one of a concave portion or a convex portion is formed on the hard resin molded body on a joint surface between the hard resin molded body and the resin of the resin molded product. Construction.   The bolt or nut resin casting structure according to claim 1 or 2, wherein at least one of a concave portion or a convex portion is formed on the bolt or nut on a joint surface between the bolt or nut and the hard resin molded body. .   2. The bolt or nut resin casting according to claim 1, wherein a temperature sensor in which a male screw portion to be screwed into the cast nut is formed and a sensor terminal is inserted in a central portion is fastened and fixed to the nut. Construction.

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