JP7280294B2 - Resin molding - Google Patents

Description

The present invention relates to resin moldings.

2. Description of the Related Art Conventionally, resin moldings have been proposed for use as various components mounted on vehicles and the like. For example, one of the conventional resin moldings has a plate portion having a plate-like shape, a connector portion having a mating connector attached to one side surface of the plate portion and holding a terminal, and a connector portion that holds a terminal. A device accommodating portion and a substrate accommodating portion to which the device (that is, mating component) and the circuit board are respectively assembled are provided on one side and the other side (see Patent Document 1, for example). This conventional resin molding is used as a component of an ABS unit for a vehicle.

JP 2018-045915 A

In this type of resin molding, there are cases where a bolt fastening portion used for assembling with a mating part such as the above-described equipment is provided on a side wall or the like of the resin molding. Here, when a metal collar is molded integrally with the bolt fastening part (so-called insert molding), the temperature of the resin molded body taken out from the molding die after molding decreases and it takes time to completely solidify. In some cases, due to the weight of the collar, the bolted portion may be misaligned from the design position (so-called collar collapse). In particular, when the bolted portion is used as a reference position for inspecting the shape of the resin molded body, such an inclination of the bolted portion may cause deterioration in inspection accuracy. Furthermore, the slant of the bolt fastening portion may reduce the workability of fastening the bolt to the mating part. Therefore, it is desirable to suppress the inclination of the bolt fastening portion as described above as much as possible.

One of the objects of the present invention is to provide a resin molding capable of suppressing inclination of a bolted portion during molding.

In order to achieve the above object, the resin molded article according to the present invention is characterized by the following [1] to [4].
[1]
A plate-shaped side wall extending in an assembly direction with a mating component, a base plate connected to one side surface of the side wall and extending in a direction intersecting the assembly direction, and a base plate provided on the other side surface of the side wall and a bolt fastening portion through which a bolt fastened to the mating part is inserted,
The bolt fastening portion is
a bolt holding portion extending in the assembly direction and having an insertion hole penetrating from the front side facing the mating component to the opposite rear side; a cylindrical collar provided in the insertion hole; and the bolt holding portion. and a plate-like connecting portion that connects the side wall,
The bolt holding portion has the insertion hole therein and has a tubular shape extending in the assembly direction, and the connecting portion is directly connected to both the bolt holding portion and the side wall,
The amount of offset between the end surface of the bolt holding portion and the end surface of the connecting portion on the front side is larger than the amount of offset between the end surface of the bolt holding portion and the end surface of the connecting portion on the back side.
It must be a resin molding.
[2]
In the resin molding described in [1] above,
An end face of the bolt holding portion and an end face of the connecting portion are flush with each other on the back side,
It must be a resin molding.
[3]
In the resin molding described in [1] or [2] above,
The plate thickness of the connecting portion is larger than the plate thickness of the side wall,
The thickness of the side wall is greater than the thickness of the base plate,
It must be a resin molding.
[4]
The resin molding according to any one of [1] to [3] above,
Further comprising a projecting portion projecting toward the front side from the edge of the side wall on the front side,
It must be a resin molding.

According to the resin molded body having the configuration [1], the bolt fastening portion of the resin molded body has a structure in which the bolt holding portion in which the collar is inserted is connected to the side wall of the resin molded body through the connecting portion. . Furthermore, the offset amount between the end surface of the bolt holding portion and the end surface of the connecting portion on the front side facing the mating component is larger than the offset amount between the end surface of the bolt holding portion and the end surface of the connecting portion on the opposite rear side. . In other words, the bolted joint has a substantially L-shaped cantilever shape as a whole. In the present invention, the "offset amount" between the end faces represents the distance in the assembly direction from one end face to the other end face.

Here, in general, in a portion having an L-shaped shape in the resin molded body, the angle of the L-shaped corner is specified in the mold due to the distribution and bias of the shrinkage rate of the resin molded body during molding. It is known that a phenomenon (so-called inward warpage) occurs in which the portion warps so as to be smaller than the angle set. Therefore, in the bolt fastening portion of this configuration, even if the front end face of the bolt holding portion is tilted away from the side wall due to the weight of the collar during molding, the bolt fastening portion has a substantially L-shaped shape. Due to the inward warping phenomenon described above, the front end surface of the bolt holding portion approaches the side wall. That is, the inclination of the bolt holding portion due to the weight of the collar is offset (that is, corrected) by the inclination of the bolt holding portion due to the inward warping phenomenon. Therefore, the resin molding of this configuration can suppress the inclination of the bolt fastening portion during molding.

According to the resin molding having the configuration [2], the end surface of the bolt holding portion and the end surface of the connecting portion are flush with each other on the back side. That is, the offset amount between the end faces on the back side is zero. Thereby, the thickness of the connecting portion can be increased compared to the case where the end surface of the bolt holding portion and the end surface of the connecting portion are offset on the back side. As a result, the strength of the connecting portion is improved, and the inclination of the bolted portion itself can be suppressed. Furthermore, since the inward warping phenomenon described above occurs more remarkably, the inclination of the bolted portion can be suppressed more appropriately.

According to the resin molding having the configuration [3], the plate thickness increases in the order of the base plate, the side wall, and the connecting portion. As a result, the cooling and solidification during molding is completed in this order, so that the base plate, which is solidified early, supports the side wall which tends to tilt due to the weight of the bolted portion, thereby suppressing the tilting of the side wall. Furthermore, when the joint solidifies after the side walls have solidified, the above-mentioned inward warping phenomenon corrects the inclination of the bolted joint. Therefore, the resin molding of this configuration can more effectively utilize the effect of suppressing the inclination of the bolted portion using the above-described inward warping phenomenon.

According to the resin molded body having the configuration [4] above, when the resin molded body taken out from the molding die is placed on a workbench or the like until cooling and solidification is completed, the projecting portion of the resin molded body interferes with the front surface. Since the resin molded body cannot be placed on a workbench or the like with its side down, the resin molded body is placed on a workbench or the like with the front side facing up. In this case, since the front side having a large offset amount is oriented upward, the inclination of the bolt holding portion tends to increase due to the weight of the collar. However, as described above, in the resin molded body of this configuration, inclination of the bolt holding portion can be suppressed due to the inward warping phenomenon. Therefore, the resin molding of this configuration can more effectively utilize the effect of suppressing the inclination of the bolted portion using the above-described inward warping phenomenon.

As described above, according to the present invention, it is possible to provide a resin molded body that can suppress inclination of the bolted portion during molding.

The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the detailed description below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a resin molding according to an embodiment of the present invention assembled with a circuit board and equipment. FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a sectional view corresponding to FIG. 2 of the resin molding shown in FIG. 1 in a single state. FIG. 4 is a perspective view of the resin molding shown in FIG. 3 as viewed from the front side. 5 is a front view of the resin molding shown in FIG. 3. FIG. 6(a) is an enlarged view of the portion B in FIG. 5, and FIG. 6(b) is a cross-sectional view taken along line CC of FIG. 6(a). FIG. 7 is a diagram corresponding to FIG. 6(b) for explaining the transition of the inclination of the bolt fastening portion during cooling after molding of the resin molded body, and FIG. FIG. 7(b) shows the stage in which the bolt holding portion tilts outward along with the outward tilt of the bolt holding portion, and FIG. It shows the stage where the inclination of the bolt holding part disappears as the part inclines inward.

<Embodiment>
Hereinafter, a resin molding 1 according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 5 (particularly, FIGS. 2 to 3), the resin molded body 1 is a resin molded body integrally including a connector portion 10, a substrate housing portion 20, and a device housing portion 30. be. In this example, the resin molding 1 is used as a part of an ABS (Antilock Brake System) unit for a vehicle. As will be described later, the circuit board 60 for ABS control is housed in the board housing portion 20, and the solenoid coil 71 constituting the hydraulic valve 70 is housed in the device housing portion 30. As shown in FIG.

Hereinafter, for convenience of explanation, vertical direction, width direction, front-rear direction, front surface, back surface, front and rear are defined as shown in FIGS. The vertical direction, the width direction and the front-rear direction are orthogonal to each other. 4 and 5, for convenience of explanation, illustration of a recess 13 and a terminal insertion hole 33, which will be described later, is omitted.

The resin molded body 1 is assembled to the mating part (not shown) located on the front side of itself by bringing itself closer to the front side along the vertical direction, and the resin molded body 1 has It is fastened and fixed to a mating component (not shown) using bolts 81 inserted through a plurality of bolt fastening portions 34 (see FIGS. 4 and 5 in particular), which will be described later. The "assembly direction" of the present invention coincides with the vertical direction.

As shown in FIG. 3 , the resin molded body 1 includes a flat plate-like base plate 40 positioned substantially in the vertical center of the resin molded body 1 . At the front of the front portion of the base plate 40, a substantially rectangular cylindrical frame projecting toward the front is provided as the side wall 11 of the connector section 10 (see also FIG. 4). A region of the base plate 40 surrounded by the side walls 11 constitutes a back wall 12 of the connector portion 10 .

A cylindrical frame projecting to the rear side is provided as a side wall 21 of the substrate accommodating portion 20 on the rear surface of the peripheral portion of the base plate 40 (see also FIG. 4). In other words, the base plate 40 also serves as the back wall 22 of the board housing portion 20 .

On the front of the rear side portion of the base plate 40, a substantially rectangular cylindrical frame projecting to the front side is provided as the side wall 31 of the device accommodating portion 30 so as to be arranged on the rear side of the side wall 11 with an interval therebetween. (see also Figure 4). A region of the base plate 40 surrounded by the side walls 31 constitutes a back wall 32 of the equipment housing section 30 . As shown in FIGS. 2 and 3 , the front end portion 10 a of the connector portion 10 (the front edge portion of the side wall 11 ) protrudes further to the front side than the front edge portion of the side wall 31 .

In the rear wall 12 of the connector portion 10, a large number of terminals 50 linearly extending in the vertical direction (in other words, the fitting direction) are provided in the rear wall 12 and are provided with a large number of through holes (not shown) penetrating in the vertical direction. ) are press-fitted and fixed so as to penetrate each of them. That is, the back side end of each terminal 50 is exposed to the board accommodating portion 20 , and the front side end is exposed to the connector portion 10 .

The thickness T1 of the portion of the base plate 40 corresponding to the back wall 12 is larger than the thickness T2 of the other portion of the base plate 40 . That is, the thickness T1 of the back wall 12 of the connector portion 10 is the thickness T2 of the back wall 32 of the device housing portion 30, and the thickness of the connecting portion 41 that connects the back wall 12 and the back wall 32 of the device housing portion 30. is larger than T2.

An annular recess 13 recessed toward the front side is formed on the rear surface of the back wall 12 of the connector portion 10 at a position slightly inside the cylindrical side wall 11 and at a position avoiding the terminals 50 . In other words, the recess 13 is formed by the inner surface (the surface defining the fitting chamber) of the connector portion 10 (fitting chamber) defined by the side wall 11 and the inner wall 12 (see FIG. 3). The upper surface) is formed so as to be recessed in the thickness direction of the inner wall 12 . The depression 13 forms a thin portion 14 of the inner wall 12 near the connection position between the inner wall 12 and the connecting portion 41 and avoiding the terminal 50 .

The above-mentioned "neighborhood" may be any position that has no or minimal influence on the support of the terminal 50 and that can suppress distortion of the resin molded body 1 due to the difference in cooling time. For example, the "neighborhood" can be rephrased as a position between the connection position between the back wall 12 and the connecting portion 41 and the region of the back wall 12 through which the terminal 50 penetrates.

At a plurality of locations on the back wall 32 of the device accommodating portion 30, there are provided terminal insertion terminals 73 for inserting a pair of leaf spring-like terminals 73 (see FIG. 2) protruding from the back side end of the solenoid coil 71 toward the back side. Holes 33 (through holes) are formed respectively. Note that the thickness T3 of the side wall 31 of the device accommodating portion 30 is slightly larger than the thickness T2 of the connecting portion 41 in this example, but may be the same as the thickness T2 of the connecting portion 41 .

When the mating connector (not shown) is fitted into the connector portion 10 (specifically, the fitting chamber defined by the side wall 11 and the back wall 12), the terminals (female terminals, not shown) of the mating connector are fitted. ) and the terminal 50 are electrically connected.

As shown in FIGS. 1 and 2, a circuit board 60 for ABS control is accommodated and fixed in the board accommodating portion 20 . In a state where the circuit board 60 is fixed, the rear side end portions of the many terminals 50 are in a state of being penetrated through a large number of through holes (not shown) provided in the circuit board 60 and penetrating in the vertical direction. It is fixed to the circuit board 60 at . As a result, each terminal 50 and the circuit board 60 are electrically connected.

A plurality of solenoid coils 71 are accommodated in the device accommodating portion 30 such that leaf spring-like terminals 73 protruding from the solenoid coils 71 toward the back side pass through the terminal insertion holes 33 and are exposed in the board accommodating portion 20 . Fixed.

The back-side end portions of the leaf spring-like terminals 73 exposed in the board accommodating portion 20 are in pressure contact with the front surface of the circuit board 60 . As a result, each solenoid coil 71 is electrically connected to the mating connector attached to the connector section 10 via the circuit board 60 .

The solenoid coil 71 has a cylindrical shape, and a rod-shaped plunger 72 is accommodated in the internal space so as to be vertically movable relative to the solenoid coil 71 by an electromagnetic force generated by the solenoid coil 71 . ing. The solenoid coil 71 and plunger 72 constitute a hydraulic valve 70 .

An actuator unit 80 for ABS control is attached to the front end face of the side wall 31 of the equipment housing portion 30 so as to close the opening of the equipment housing portion 30 . This mounting is performed by, for example, bolting using a plurality of bolting holes (not shown) provided in the side wall 31 .

Although not shown, the actuator unit 80 incorporates valve seats of the plurality of hydraulic valves 70, a pump for pumping up hydraulic oil stored in a reservoir, and the like, and a motor 90 for driving the pump is mounted in front of the actuator unit 80. is installed.

The front end of the plunger 72 housed in each solenoid coil 71 is inserted into the valve seat portion of the hydraulic valve 70 inside the actuator unit 80 . By controlling the vertical position of the plunger 72 with the electromagnetic force generated by each solenoid coil 71, the opening and closing of the corresponding hydraulic valve 70 are controlled, and well-known ABS control is executed.

Briefly describing ABS control, when the slip ratio of a certain wheel exceeds a predetermined value, the hydraulic valve 70 corresponding to that wheel is controlled to increase the brake fluid pressure corresponding to that wheel to the master cylinder of the vehicle. Reduces the hydraulic pressure corresponding to the brake pedal depression force generated by As a result, the slip ratio of the wheel is adjusted so as to remain within the predetermined value. Hydraulic oil returned to the reservoir when the brake fluid pressure is reduced is pumped up by a pump driven by a motor 90 and returned to the master cylinder of the vehicle.

As shown in FIGS. 4 and 5 , bolt fastening portions 34 protruding outward from the equipment housing portion 30 are provided at a plurality of locations (in this example, four locations) in the circumferential direction of the side wall 31 of the equipment housing portion 30 . integrally formed. Hereinafter, for convenience of explanation, the inner/outer direction and the circumferential direction are defined as shown in FIGS. 6 and 7 . The inner-outer direction corresponds to the plate thickness direction of the side wall 31 , and the inner side and the outer side correspond to the inner side and the outer side of the equipment accommodating portion 30 , respectively. The circumferential direction matches the circumferential direction of the side wall 31 . As shown in FIG. 6B , the bolt fastening portion 34 is provided on the outer side surface of the side wall 31 , and the inner side wall 32 (part of the base plate 40 ) of the equipment housing portion 30 is connected to the inner side surface of the side wall 31 . are doing.

As shown in FIG. 6 , the bolt fastening portion 34 includes a bolt holding portion 35 , a metal collar 37 provided on the bolt holding portion 35 , and a plate-like connecting portion 38 that connects the bolt holding portion 35 and the side wall 31 . , consists of

The bolt holding portion 35 has a cylindrical shape extending in the vertical direction, and has an insertion hole 36 (see FIG. 6A) penetrating in the vertical direction. In the vertical direction, the position of the front end surface of the bolt holding portion 35 coincides with the position of the front end surface of the side wall 31 (see FIG. 6B).

The collar 37 has a cylindrical shape extending in the vertical direction, and has an insertion hole 37a (see FIG. 6A) penetrating in the vertical direction. In this example, the collar 37 is integrated with the bolt holding portion 35 by insert molding so as to be inserted into the insertion hole 36 . The front end face of the collar 37 projects slightly forward than the front end face of the bolt holding portion 35 , and the rear end face of the collar 37 projects slightly behind the rear end face of the bolt holding portion 35 . protruding to the side. The above-described bolt 81 used for fastening the resin molding 1 and the mating part is inserted through the insertion hole 37 a of the collar 37 .

In this example, the connecting portion 38 has a plate-like shape that expands in a direction perpendicular to the vertical direction and whose width in the circumferential direction gradually decreases from the side wall 31 toward the bolt holding portion 35 . As can be understood from FIG. 6B, the thickness H3 of the connecting portion 38 is greater than the thickness H2 of the side wall 31, and the thickness H2 of the side wall 31 is greater than the thickness H1 of the inner wall 32. As shown in FIG.

The plate thickness H3 of the connecting portion 38 is smaller than the length (length in the vertical direction) of the bolt holding portion 35 . In this example, the connecting portion 38 supports the rear portion of the bolt holding portion 35 . Therefore, the front end surface of the bolt holding portion 35 protrudes forward from the front end surface of the connecting portion 38 . The projection amount a of the front end surface of the bolt holding portion 35 can also be said to be the offset amount a between the front end surface of the bolt holding portion 35 and the front end surface of the connecting portion 38 . On the other hand, the end face of the bolt holding portion 35 on the back side and the end face of the connecting portion 38 on the back side are flush with each other. That is, in this example, the amount of offset between the rear-side end surface of the bolt holding portion 35 and the rear-side end surface of the connecting portion 38 is zero. As a result, as shown in FIG. 6B, the connecting portion 38 and the bolt holding portion 35 have a substantially L-shaped shape when viewed from the circumferential direction.

<Transition of the inclination of the bolted portion during cooling after molding>
In this example, a metal collar 37 is integrated with the bolt holding portion 35 by insert molding. For this reason, after the resin molded body 1 is molded, the bolt fastening portion 34 may be loosened due to the weight of the collar 37 until the temperature of the resin molded body 1 removed from the molding die is lowered and the resin molded body 1 is completely solidified. (More specifically, the bolt holding portion 35) may tilt. When the bolt fastening portion 34 is used as a reference position for inspecting the shape of the resin molded body 1 and the like, such inclination of the bolt fastening portion 34 can cause deterioration in inspection accuracy. In this regard, this example has a structure in which the bolt fastening portion 34 is less likely to be inclined. This will be described below with reference to FIG.

The resin molding 1 taken out from the molding die is placed on a working table until it is cooled and solidified. At that time, if the resin molded body 1 is placed in such a direction that the front side faces vertically downward, the front end portion 10a of the connector portion 10 (see FIG. 3) is a hindrance, and the resin molded body 1 cannot be placed properly (so that the vertical direction of the resin molded body 1 coincides with the vertical direction). Therefore, as shown in FIG. 7(a), the resin molded body 1 is placed on the workbench so that the front side faces vertically upward and the vertical direction of the resin molded body 1 coincides with the vertical direction. be.

In the resin molded body 1 placed on the workbench in this way, due to the weight of the metal collar 37 at the stage before the device accommodating portion 30 is solidified, the white arrow in FIG. , the side wall 31 of the device accommodating portion 30 is tilted outward, and along with this tilt of the side wall 31, the bolt holding portion 35 is also tilted outward (the end face on the front side of the bolt holding portion 35 is outside the end face on the back side). (see θ shown in FIG. 7(a)).

In this example, as described above, the plate thickness increases in order of the back wall 32 (base plate 40) of the device housing portion 30, the side wall 31 of the device housing portion 30, and the connecting portion 38 (see FIG. 6B). , H1<H2<H3). As a result, during cooling after molding, cooling and solidification of the back wall 32, the side wall 31, and the connecting portion 38 are completed in this order.

First, when the rear wall 32 solidifies early, the solidified rear wall 32 acts as a beam that supports the side wall 31, which tends to tilt further due to the weight of the collar 37, and holds the side wall 31 so that the tilt of the side wall 31 does not become excessive. become functional. Next, the side wall 31 is solidified while the inner wall 32 functions as a beam. By solidifying the side wall 31, progress of the inclination θ of the side wall 31 is completely completed.

The connecting portion 38 is then solidified. Here, in general, a resin molded body having an L-shaped shape has a characteristic of shrinking during shrinkage after molding such that the internal angle of two sides forming the L-shape becomes smaller. As described above, in this example, the connecting portion 38 and the bolt holding portion 35 are substantially L-shaped. Due to this, when the connecting portion 38 solidifies, the bolt holding portion 35 inclines inward as indicated by the white arrow in FIG. The front end face of the portion 35 is inclined to move inward with respect to the rear end face). As a result, the inward inclination of the bolt holding portion 35 and the outward inclination θ of the bolt holding portion 35 caused by the outward inclination θ of the side wall 31 cancel each other out, and the inclination of the bolt holding portion 35 disappears. (the vertical direction of the bolt holding portion 35 matches the vertical direction). As described above, in this example, the bolt fastening portion 34 is less likely to tilt.

<Action/effect>
According to the resin molded body 1 according to the present embodiment, the resin molded body 1 has a structure in which the bolt holding portion 35 provided with the collar 37 is connected to the side wall 31 of the resin molded body 1 through the connecting portion 38. . Furthermore, the offset amount (>0) between the end surface of the bolt holding portion 35 and the end surface of the joint portion 38 on the front side facing the mating component is the same as the amount of offset (>0) between the end surface of the bolt holding portion 35 and the joint portion 38 on the opposite rear side. It is larger than the offset amount (=0) from the end face. In other words, the bolt fastening portion 34 has a substantially L-shaped cantilever shape as a whole. Here, even if the front end surface of the bolt holding portion 35 is tilted away from the side wall 31 due to the weight of the collar 37, the front end surface of the bolt holding portion 35 may not be attached to the side wall 31 due to the above-described inward warping phenomenon during molding. The resin molding 1 is cooled and solidified while the periphery of the connecting portion 38 shrinks as it approaches. As a result, the inclination of the bolt fastening portion 34 is suppressed. Therefore, the resin molded body 1 according to this embodiment can suppress the inclination of the bolt fastening portion 34 during molding.

Furthermore, according to the resin molded body 1 according to the present embodiment, the end surface of the bolt holding portion 35 and the end surface of the connecting portion 38 are flush with each other on the back side. Thereby, the thickness of the connecting portion 38 can be increased compared to the case where the end surface of the bolt holding portion 35 and the end surface of the connecting portion 38 are offset on the back side. Therefore, the strength of the connecting portion 38 is improved, and the above-described inward warping phenomenon occurs more remarkably. As a result, the inclination of the bolt fastening portion 34 can be suppressed more effectively.

Furthermore, according to the resin molded body 1 according to the present embodiment, the plate thickness increases in order of the back wall 32 (base plate 40), the side wall 31, and the connecting portion 38. As shown in FIG. As a result, cooling and solidification during molding are completed in this order, so that the inner wall 32 that solidifies early supports the side wall 31 that is about to tilt due to the weight of the collar 37 of the bolt fastening portion 34, and the side wall 31 tilts. The tether 38, which solidifies last, corrects the inclination of the bolt fastening portion 34, while preventing an excessive increase in . Therefore, the inclination of the bolt fastening portion 34 can be suppressed more effectively.

Furthermore, according to the resin molded body 1 according to the present embodiment, when the resin molded body 1 taken out from the mold is placed on a workbench or the like until it cools and solidifies, the projecting portion (the front side of the connector portion 10 Since the end portion 10a) is in the way, it cannot be placed with the front side facing down, and the front side must be placed with the front side facing up. For this reason, even when the inclination of the bolt fastening portion 34 can become particularly pronounced, the inclination of the bolt fastening portion 34 can be suppressed more effectively.

<Other aspects>
The present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, number, location, etc. of each component in the above-described embodiment are arbitrary and not limited as long as the present invention can be achieved.

In the above-described embodiment, the end surface of the bolt holding portion 35 on the back side and the end surface of the connecting portion 38 on the back side are flush with each other. On the other hand, the projection amount a (offset amount a) of the front end surface of the bolt holding portion 35 with respect to the front end surface of the joint portion 38 is the same as that of the bolt holding portion 35 with respect to the rear end surface of the joint portion 38 . The rear end face of the bolt holding portion 35 may protrude rearward from the rear end face of the connecting portion 38 as long as it is larger than the rearward projection amount (offset amount) of the rear end face of the bolt holding portion 35 .

Here, the characteristics of the embodiment of the resin molded body 1 according to the present invention described above are briefly summarized and listed as "1" to "4" below.
[1]
a plate-shaped side wall (31) extending in the assembly direction with the mating part; a base plate (40) connected to one side surface of the side wall (31) and extending in a direction intersecting the assembly direction; A resin molded body (1) having a bolt fastening portion (34) provided on the other side surface of the side wall (31) and through which a bolt (81) fastened to the mating part is inserted There is
The bolt fastening portion (34) is
A bolt holding portion (35) having an insertion hole (36) extending in the assembly direction and penetrating from the front side facing the mating part to the opposite rear side, and a cylinder provided in the insertion hole (36). a collar (37) and a plate-like connecting portion (38) connecting the bolt holding portion (35) and the side wall (31),
The offset amount (a) between the end surface of the bolt holding portion (35) and the end surface of the connecting portion (38) on the front side is ) is greater than the offset from the end face of
Resin molding (1).
[2]
In the resin molding (1) described in [1] above,
An end surface of the bolt holding portion (35) and an end surface of the connecting portion (38) are flush with each other on the back side,
Resin molding (1).
[3]
In the resin molding (1) according to [1] or [2] above,
The plate thickness (H3) of the connecting portion (38) is greater than the plate thickness (H2) of the side wall (31),
The thickness (H2) of the side wall (31) is greater than the thickness (H1) of the base plate (40),
Resin molding (1).
[4]
The resin molding (1) according to any one of [1] to [3] above,
Further comprising a protruding portion (10a) protruding toward the front side from the edge of the side wall (31) on the front side,
Resin molding (1).

1 resin molded body 10a front end of connector portion (protruding portion)
31 side wall 32 back wall (base plate)
34 bolt fastening portion 35 bolt holding portion 36 insertion hole 37 collar 38 connecting portion 40 base plate

Claims (4)

A plate-shaped side wall extending in an assembly direction with a mating component, a base plate connected to one side surface of the side wall and extending in a direction intersecting the assembly direction, and a base plate provided on the other side surface of the side wall and a bolt fastening portion through which a bolt fastened to the mating part is inserted,
The bolt fastening portion is
a bolt holding portion extending in the assembly direction and having an insertion hole penetrating from the front side facing the mating component to the opposite rear side; a cylindrical collar provided in the insertion hole; and the bolt holding portion. and a plate-like connecting portion that connects the side wall,
The bolt holding portion has the insertion hole therein and has a tubular shape extending in the assembly direction, and the connecting portion is directly connected to both the bolt holding portion and the side wall,
The amount of offset between the end surface of the bolt holding portion and the end surface of the connecting portion on the front side is larger than the amount of offset between the end surface of the bolt holding portion and the end surface of the connecting portion on the back side.
Resin molding. In the resin molding according to claim 1,
An end face of the bolt holding portion and an end face of the connecting portion are flush with each other on the back side,
Resin molding. In the resin molding according to claim 1 or claim 2,
The plate thickness of the connecting portion is larger than the plate thickness of the side wall,
The thickness of the side wall is greater than the thickness of the base plate,
Resin molding. The resin molding according to any one of claims 1 to 3,
Further comprising a projecting portion projecting toward the front side from the edge of the side wall on the front side,
Resin molding.

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