Fixing structure and fixing method

Abstract

To obtain a fixing structure which inhibits occurrence of metallic foreign objects and achieves reduction of costs, and to obtain a fixing method.SOLUTION: In a fixing structure, a resin case 11 and a motor housing 14 are fixed along a direction in which these component are moved close to each other. The fixing structure includes: through holes 111a penetrating through the resin case 11; fixing pins 12 each including a shaft part 121 and a pressing part 122; pin receiving parts 112a each configured to support the pressing part 122; ventilation pipes 141 disposed at the motor housing 14 and each including an inlet 141a communicating with the through hole 111a, and a vent hole 141b opened to the outside; an O ring 13 sealing the inlet 141a side of the ventilation pipe 141; and a sealing valve 15. An internal pressure of an internal space S of the ventilation pipe 141 sealed by the O ring 13 and the sealing valve 15 is lower than an external pressure of the internal space S.SELECTED DRAWING: Figure 2

Description

Technical Field

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[0001] The present invention relates to a fixing structure and a fixing method.

Background Art

[0002] Conventionally, a resin molded body has been proposed as various components mounted on a vehicle or the like (see, for example, Patent Document 1). The resin molded body described in Patent Document 1 is used as a part of a vehicle ABS (Antilock Brake System) unit and is fixed to a mating part such as a device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, a metal collar is integrally formed by insert molding in the above-described resin molded body. Then, the resin molded body and the mating part are bolted together by bolts inserted into the insertion holes of the collar. However, in such a configuration, foreign metal objects may be generated inside the resin molded body during the insert molding of the collar, which has caused a decrease in quality. In addition, in this type of resin molded body, since the locations where bolts are fastened extend over a plurality of places, the number of parts such as collars increases accordingly, and the manufacturing cost of the resin molded body has been high. [[ID=3)]<00000]7><Q An object of the present invention is to obtain a fixing structure and a fixing method that suppress the generation of foreign metal objects and reduce costs.

Means for Solving the Problems

[0006] To solve the aforementioned problems and achieve the objective, the fixing structure is a fixing structure that fixes a fixing member and a fixed member along a fixing direction in which they approach each other, and comprises a fixing pin having a through hole that penetrates the fixing member in the fixing direction, a shaft portion inserted into the through hole, and a pressing portion provided on one end of the shaft portion that presses the fixing member toward the fixed member in the fixing direction; a pin receiving portion provided on the fixing member that supports the pressing portion; a ventilation pipe arranged on the fixed member and having an inlet communicating with the through hole and an outlet opening to the outside; a sealing portion that surrounds the shaft portion of the fixing pin and seals the inlet side of the ventilation pipe; and a sealing valve inserted into the outlet, characterized in that the internal pressure of the internal space of the ventilation pipe sealed by the sealing portion and the sealing valve is smaller than the external pressure of the internal space. [Effects of the Invention]

[0007] With this configuration, it is possible to obtain a fixing structure and fixing method that suppress the generation of metallic foreign matter and reduce costs. [Brief explanation of the drawing]

[0008] [Figure 1] A perspective view of a resin molded body equipped with a fixing structure according to one embodiment of the present invention. [Figure 2] A schematic diagram showing the internal structure of a resin molded product. [Figure 3] Plan view of the resin molded body from above. [Figure 4] Enlarged view of the main part of the fixing section in a resin molded product. [Figure 5] Front view of the fixing part, seen from the front. [Modes for carrying out the invention]

[0009] One embodiment of the present invention will be described below with reference to Figures 1 to 5. As shown in Figure 1, the fixing structure is used, for example, in a resin molded body 1 used in an ABS unit (Antilock Brake System) for a vehicle. The resin molded body 1 comprises a resin case 11 (fixing member, case), a fixing pin 12, an O-ring 13 (sealing part), a motor housing 14 (fixed member, housing), and a sealing valve 15.

[0010] In the drawings, arrows X, Y, and Z are perpendicular to each other. In this embodiment, one of the extending directions of the resin molded body 1 is indicated by arrow X and labeled "front-to-back direction X". One side of the front-to-back direction X is labeled "front side X1", and the other side is labeled "rear side X2". The other extending direction of the resin molded body 1 is indicated by arrow Y and labeled "width direction Y". One side of the width direction Y is labeled "left side Y1", and the other side is labeled "right side Y2". The fixing direction in which the resin case 11 and the motor housing 14 approach each other is indicated by arrow Z and labeled "height direction Z". One side of the height direction Z is labeled "upper side Z1", and the other side is labeled "lower side Z2". This is for the convenience of explanation only and does not necessarily coincide with the direction in the actual usage state, nor does it limit the direction in the actual usage state.

[0011] The resin case 11 is an electronic control box that houses a circuit board for ABS control, and is formed in the shape of a rectangular parallelepiped box that is long in the width direction Y and opens towards the top Z1. As shown in Figures 2 and 3, the side wall facing the front side X1 and the side wall facing the rear side X2 of the resin case 11 are each provided with columnar fixing parts 111 that protrude outward in the front-rear direction X and extend in the height direction Z. In this embodiment, two fixing parts 111 are formed on the side wall facing the front side X1 and the side wall facing the rear side X2 of the resin case 11, with a gap in the width direction Y.

[0012] As shown in Figure 5, the fixing portion 111 is provided with a through hole 111a that penetrates in the height direction Z. The through hole 111a is composed of a large-diameter first through hole 111a-1 and a small-diameter second through hole 111a-2 that is coaxial with the first through hole 111a-1. With this configuration, a stepped portion 112 is formed inside the fixing portion 111 between the first through hole 111a-1 and the second through hole 111a-2. The upper surface of the stepped portion 112 is a pin receiving portion 112a that supports the pressing portion 122 of the fixing pin 12, which will be described later, and is formed flat so as to be able to contact the lower surface of the pressing portion 122.

[0013] The fixing pin 12 is a component inserted into the through hole 111a of the fixing part 111, and as shown in Figure 4, it comprises a shaft portion 121 and a pressing portion 122. The shaft portion 121 is formed in a cylindrical shape extending in the height direction Z, and an annular groove 121a that is recessed radially inward is formed on the outer circumferential surface of its lower side Z2 over its entire circumference. The diameter of the shaft portion 121 is smaller than the inner diameter of the second through hole 111a-2 in the fixing part 111, and the axial dimension of the shaft portion 121 is larger than the height direction Z dimension of the stepped portion 112 in the fixing part 111.

[0014] The pressing portion 122 is a cylindrical head formed coaxially with the shaft portion 121 and with a larger diameter than the shaft portion 121 at the upper end (one end) of the shaft portion 121 Z1. The diameter of the pressing portion 122 is set to be smaller than the inner diameter of the first through hole 111a-1 in the fixing portion 111 and larger than the inner diameter of the second through hole 111a-2. With this configuration, when the fixing pin 12 is inserted into the through hole 111a and moves toward the lower Z2, the lower surface of the pressing portion 122 comes into contact with the pin receiving portion 112a, and the fixing pin 12 is supported by the pin receiving portion 112a. Furthermore, if the fixing pin 12 tries to move toward the lower Z2 from this state, the pressing portion 122 will press the pin receiving portion 112a toward the lower Z2. In other words, the pressing portion 122 functions as a part that presses the resin case 11 toward the motor housing 14 in the fixing direction.

[0015] When the fixing pin 12 is inserted into the through hole 111a, according to the dimensions of the shaft portion 121, the lower end Z2 of the shaft portion 121 will protrude from the second through hole 111a-2 to the lower Z2. In this state, the annular groove 121a is exposed on the lower side of the resin case 11. The portion of the shaft portion 121 that is exposed from the resin case 11 is then inserted into the first pipe 1411, which constitutes the inlet 141a side of the ventilation pipe 141, which will be described later.

[0016] The O-ring 13 is fitted into the annular groove 121a of the fixing pin 12. That is, the O-ring 13 surrounds the shaft portion 121 of the fixing pin 12 in the circumferential direction. The outer diameter of the shaft portion 121 in the portion where the O-ring 13 is fitted is approximately the same as the inner diameter of the first pipe 1411 of the ventilation pipe 141. Therefore, as shown in Figure 5, when the fixing pin 12 is inserted into the through hole 111a with the through hole 111a and the ventilation pipe 141 in communication, the O-ring 13 enters the first pipe 1411 (the side of the inlet 141a of the ventilation pipe 141), and the ventilation pipe 141 is sealed.

[0017] The motor housing 14 is a housing member that accommodates the drive unit of the ABS unit, and is formed in the shape of a rectangular box, with larger dimensions in the front-to-back direction X and width direction Y than the resin case 11. The motor housing 14 is positioned on the lower side Z2 of the resin case 11 and is fixed to the resin case 11 with its upper surface in contact with the lower surface of the resin case 11.

[0018] A ventilation pipe 141 is installed inside the motor housing 14. The ventilation pipe 141 comprises a first pipe 1411, a second pipe 1412, and a third pipe 1413. The first pipe 1411 connects the through hole 111a on the left side Y1 and the through hole 111a on the right side Y2, respectively. In this embodiment, two first pipes 1411 are installed side by side in the width direction Y. The second pipe 1412 is positioned in the center of the first pipe 1411 in the front-to-back direction X and connects the two first pipes 1411. The third pipe 1413 extends from the left side Y1 end of the second pipe 1412 toward the front side X1.

[0019] The ventilation pipe 141 is provided with an inlet 141a and a ventilation port 141b (outlet). The inlet 141a is an opening that communicates with the end of the lower side Z2 of the through-hole 111a when the resin case 11 and the motor housing 14 are integrated. The inlet 141a is provided at both the left and right ends of the first pipe 1411 and opens upward Z1, that is, toward the resin case 11 side. The ventilation port 141b is provided at the end of the front side X1 of the third pipe 1413 and opens toward the front side X1, that is, to the outside of the motor housing 14.

[0020] The sealing valve 15 is a sealing member that seals the ventilation port 141b side of the ventilation pipe 141. The sealing valve 15 has a width dimension that closely adheres to the inner wall surface of the third pipe 1413 and is formed in a rod shape. The sealing valve 15 is inserted into the ventilation pipe 141 from the ventilation port 141b toward the rear side X2 and is fixed therein.

[0021] Next, the fixing method of the resin case 11 and the motor housing 14 will be described. This fixing method is a method of fixing the resin case 11 as a fixing member and the motor housing 14 as a fixed member along the height direction Z (fixing direction) in which they approach each other. This fixing method includes a communication step, an insertion step, a vacuum drawing step, and a sealing step.

[0022] In the communication step, first, the resin case 11 is positioned on the upper part of the motor housing 14. Specifically, as shown in FIG. 1, the resin case 11 is arranged on the motor housing 14 so that the internal space of the through-hole 111a in the fixing portion 111 of the resin case 11 and the internal space of the ventilation pipe 141 in the motor housing 14 communicate with each other. Here, the internal space in the ventilation pipe 141 is denoted as the internal space S. Then, the process proceeds to the insertion step.

[0023] In the insertion process, as shown in Figure 5, the fixing pin 12 with the O-ring 13 fitted in the annular groove 121a is inserted into the through hole 111a. At this time, the fixing pin 12 is pushed downward Z2 until the lower surface of the pressing portion 122 of the fixing pin 12 contacts the pin receiving portion 112a. In this way, the fixing pin 12 with the shaft portion 121 surrounded by the O-ring 13 is inserted into the through hole 111a, and the pressing portion 122 is supported by the pin receiving portion 112a. At this time, due to the dimensions of the shaft portion 121 described above, the lower end side of the shaft portion 121 protrudes downward Z2 from the second through hole 111a-2, so that the O-ring 13 enters the first pipe 1411. As a result, the inlet 141a side of the ventilation pipe 141 is sealed by the O-ring 13. In other words, during the insertion process, the pin receiving portion 112a supports the pressing portion 122, and the fixing pin 12 seals the side of the inlet 141a of the ventilation pipe 141. Next, the process proceeds to the vacuuming process.

[0024] In the vacuuming process, gas is drawn from the internal space S through the vent port 141b of the ventilation pipe 141 of the motor housing 14, creating a vacuum in the internal space S. Then, the process proceeds to the sealing process.

[0025] In the sealing process, a sealing valve 15 is inserted into the vent opening 141b to seal the third pipe 1413 side of the vent pipe 141.

[0026] As described above, according to this embodiment, the internal pressure of the internal space S of the ventilation pipe 141 sealed by the O-ring 13 (sealing portion) and the sealing valve 15 becomes smaller than the external pressure of the internal space S. Therefore, due to the pressure difference between the inside and outside of the internal space S, a force is applied to the fixing pin 12, which is inserted into the through hole 111a, from the outside to the inside of the internal space S, that is, a force toward the motor housing 14 (fixed member). As a result, the fixing pin 12 attempts to displace toward the motor housing 14 in the height direction Z (fixing direction), and at that time the pressing portion 122 presses the pin receiving portion 112a toward the motor housing 14. Consequently, the resin case 11 is pressed toward the motor housing 14 by the fixing pin 12. On the other hand, due to the pressure difference between the inside and outside of the internal space S, a force is applied to the motor housing 14 toward the resin case 11 in the height direction Z, thereby pressing it toward the resin case 11. In this way, the resin case 11 and the motor housing 14 are integrated and this state is maintained. Therefore, unlike conventional configurations that use collars and bolts to fix the resin molded body to the mating part, there is no need to insert mold a collar, thus suppressing the generation of the aforementioned metallic foreign matter. Furthermore, since the collar and nuts that screw into the bolts are not needed in the first place, the cost of introducing the fixing structure can be reduced by the amount of those parts. Thus, a fixing structure that suppresses the generation of metallic foreign matter and reduces costs can be obtained.

[0027] Furthermore, by creating a vacuum in the internal space S, the pressure difference between the inside and outside of the internal space S can be increased, thereby allowing the integrated state of the resin case 11 and the motor housing 14 to be maintained even more stably.

[0028] Furthermore, the resin case 11 and motor housing 14 can be used in the ABS unit. This allows for the creation of an ABS unit with a fixed structure that suppresses the generation of metallic foreign matter and reduces manufacturing costs.

[0029] Furthermore, according to the fixing method of this embodiment, by performing the communication process, insertion process, vacuuming process, and sealing process, the internal pressure of the internal space S can be made smaller than the external pressure of the internal space S. This allows a force to be applied from the outside to the inside of the internal space S to the through hole 111a and the vent opening 141b of the ventilation pipe 141. As a result, as described above, the resin case 11 can be pressed toward the motor housing 14 by the fixing pin 12. Also, the motor housing 14 can be pressed toward the resin case 11. In this way, the resin case 11 and the motor housing 14 can be integrated and maintained in that state. Thus, unlike conventional configurations that use collars and bolts to fix a resin molded body to a mating part, there is no need to insert mold a collar, and the generation of metallic foreign matter as described above can be suppressed. Moreover, since the collar and parts such as nuts that screw into bolts are not needed in the first place, the cost of introducing the fixing method can be reduced by the amount of those parts. Therefore, a fixing method can be obtained that suppresses the generation of metallic foreign matter and reduces costs.

[0030] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific structure is not limited to these embodiments, and any design changes, etc., that do not depart from the gist of the present invention are also included. For example, in this embodiment, two fixing parts 111 are formed on the side wall facing the front side X1 of the resin case 11 and two on the side wall facing the rear side X2, with a gap in the width direction Y. However, the number and arrangement of the fixing parts 111 are not limited to this. That is, the fixing parts 111 may be formed on the side wall facing the left side Y1 or the side wall facing the right side Y2 of the resin case 11, or two or fewer or two or more may be formed on each side wall.

[0031] Furthermore, in this embodiment, the shaft portion 121 and the pressing portion 122 of the fixing pin 12 were each formed in a cylindrical shape. However, the shape of the shaft portion 121 and the pressing portion 122 is not limited to this, and they may be made into various shapes, such as a rectangular prism or a bottomed cylindrical shape, to match the inner circumference shape of the through hole 111a.

[0032] Furthermore, although an O-ring 13 is used as the sealing part in this embodiment, other sealing members may be used as long as they can seal the ventilation pipe 141. Alternatively, the outer diameter of the O-ring 13 may be set to be larger than the inner diameter of the second through hole 111a-2, and the O-ring 13 may be placed between the lower surface of the pressing part 122 and the pin receiving part 112a in Figure 5. That is, the O-ring 13 may be placed on the side of the through hole 111a, and the pressing part 122 may be indirectly supported by the pin receiving part 112a via the O-ring 13. In this case, a space with an inner diameter larger than the inner diameter of the second through hole 111a-2 will be created between the pressing part 122 and the pin receiving part 112a, and the internal pressure of the so-called communication space from this space to the internal space S of the ventilation pipe 141 will be smaller than the external pressure. Therefore, the force with which the pressing part 122 presses the pin receiving part 112a can be increased, and the fixed state between the resin case 11 and the motor housing 14 can be stably maintained. In the configuration where the O-ring 13 is positioned on the side of the through-hole 111a, gas may enter the communication space from the contact surface between the resin case 11 and the motor housing 14. In this case, it is advisable to place another sealing member on the contact surface between the resin case 11 and the motor housing 14.

[0033] Furthermore, for example, an oil passage may be formed inside the motor housing 14 by cutting or other means. The ventilation pipe 141 and the like may also be processed at the same time as the oil passage cutting. In this way, the oil passage and the ventilation pipe 141 can be formed together. Therefore, processing becomes easier, and in the case of a motor housing 14 where the oil passage needs to be formed, the manufacturing cost can be reduced compared to a configuration in which the ventilation pipe 141 is processed separately. [Explanation of symbols]

[0034] S interior space Z (height direction, fixed direction) 11. Resin case (fixing component) 111a Through hole 12 Fixing pins 112a Pin receiving section 121 Shaft 122 Pressing part 13. O-ring (sealing part) 14. Motor housing (fixed component) 141 Ventilation piping 141a Entrance 141b Ventilation opening (outlet) 15 Sealing valve

Claims

1. A fixing structure that fixes a fixing member and a member to be fixed along a fixing direction in which they approach each other, The fixing member has a through hole that penetrates in the fixing direction, A fixing pin comprising a shaft portion inserted into the through hole, and a pressing portion provided on one end of the shaft portion for pressing the fixing member toward the fixed member in the fixing direction, The fixing member is provided with a pin receiving portion that supports the pressing portion, A ventilation pipe is arranged on the fixed member and has an inlet that communicates with the through hole and an outlet that opens to the outside, A sealing portion surrounds the shaft portion of the fixing pin and seals the inlet side of the ventilation pipe, The outlet is inserted into the aforementioned outlet and comprises a sealing valve, A fixing structure characterized in that the internal pressure of the internal space of the ventilation pipe sealed by the sealing portion and the sealing valve is smaller than the external pressure of the internal space.

2. The fixing structure according to claim 1, characterized in that the internal space is a vacuum.

3. An ABS unit comprising the fixing structure described in claim 1, The aforementioned fixing member is a box-shaped case capable of housing a circuit board. The ABS unit is characterized in that the fixed member is a box-shaped housing capable of accommodating a drive unit.

4. A fixing method comprising: a fixing member having a through hole; a fixing pin having a shaft portion inserted into the through hole and a pressing portion provided on one end of the shaft portion; a pin receiving portion provided on the fixing member to support the fixing pin; a member to be fixed having a ventilation pipe having an inlet communicating with the through hole and an outlet opening to the outside; a sealing portion surrounding the shaft portion and sealing the inlet side of the ventilation pipe; and a sealing valve inserted into the outlet of the ventilation pipe, wherein the fixing member and the member to be fixed are fixed along a fixing direction in which they approach each other, A communication step is to connect the internal space of the through hole and the internal space of the ventilation pipe to form a communication space, Insertion step: Insert the fixing pin, with the shaft portion enclosed by the sealing portion, into the through hole, support the pressing portion with the pin receiving portion, and seal the inlet side of the ventilation pipe with the fixing pin. After the insertion step, a vacuuming step is performed to suck out the gas from the internal space of the ventilation pipe, A fixing method characterized by comprising a sealing step of inserting the sealing valve into the outlet of the ventilation pipe after the vacuuming step.

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