Bush components and refrigerant distribution devices

Abstract

A bushing part according to the present disclosure comprises an elastic bushing, and a holder. The holder has a quadrangular frame-shaped holder body portion, a flange portion hooked to a peripheral edge of a through-hole from a first side, a claw portion hooked to the peripheral edge of the through-hole from a second side, and a pair of retaining portions connected to an inner edge of the holder body portion through a hinge portion. The holder body portion has a quadrangular frame-shaped outer wall portion. The elastic bushing has an elastic plate portion, a quadrangular frame-shaped first elastic frame portion that protrudes from the elastic plate portion toward the second side and is inserted to the inside of the outer wall portion, and a pair of first protruding portions formed on an inside surface of the first elastic frame portion. A wiring hole can be formed on the elastic plate portion. The pair of retaining portions are respectively connected to a pair of first frame side portions of the holder body portion. The pair of first protruding portions are respectively formed on a pair of second frame side portions of the first elastic frame portion. Each of the pair of retaining portions has a lock portion capable of being positioned between the first protruding portion and the elastic plate portion in a retention state in which the pair of retaining portions have been folded to the first side through the hinge portion.

Description

[Technical field]

[0001] The present disclosure relates to a bushing component and a refrigerant distribution device. [Background technology]

[0002] There is known a bush component that is attached to a through hole formed in a mounting wall portion and through which a wire is passed. For example, Patent Document 1 discloses a square-shaped cord bush (bush component). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-99397 Summary of the Invention [Problem to be solved by the invention]

[0004] When the wiring passing through the bush part as described above is pulled, a force is also applied to the bush part in a direction that pulls the wiring. In this case, if the bush part is square, the force applied to the bush part may be concentrated on the corners of the square-shaped bush part. This may cause a part of the bush part to come off from the through hole formed in the mounting wall. When a part of the bush part comes off, the force applied to another part of the bush part becomes larger, and the other part of the bush part is also likely to come off. In this way, parts of the bush part come off one by one, and there is a risk that the entire bush part may come off from the through hole.

[0005] In view of the above circumstances, an object of the present disclosure is to provide a bush component having a structure capable of suppressing detachment, and a refrigerant distribution device including such a bush component. [Means for solving the problem]

[0006] One aspect of a bush part according to the present disclosure is a bush part that is attached to a rectangular through hole that penetrates a mounting wall part in a first direction, the bush part comprising: an elastic bush made of an elastic body; and a holder that holds the elastic bush, the holder having a rectangular frame-shaped holder main body part that is passed through the through hole; a flange part that protrudes from the holder main body part and is hooked onto a peripheral portion of the through hole from a first side in the first direction; a claw part that protrudes from the holder main body part and is hooked onto a peripheral portion of the through hole from a second side opposite the first side in the first direction; and a pair of holding parts that are connected to an inner edge of the holder main body part via a hinge part, the holder main body part having a rectangular frame-shaped outer wall part, the elastic bushing having an elastic plate part that covers the through hole from the first side, and a flange part that protrudes from the elastic plate part to the second side and is hooked onto a peripheral portion of the through hole from an inner side of the outer wall part. the first elastic frame portion has a rectangular frame-shaped first elastic frame portion to be inserted into the holder body and a pair of first protrusion portions formed on an inner surface of the first elastic frame portion, a wiring hole through which wiring passing through the through hole can be formed in a portion of the elastic plate portion that is located on the inside of the first elastic frame portion when viewed in the first direction, the pair of holding portions are respectively connected to a pair of first frame side portions of the holder main body portion that are arranged opposite each other in a second direction perpendicular to the first direction, the pair of first protrusion portions are respectively formed on a pair of second frame side portions of the first elastic frame portion that are arranged opposite each other in the second direction and are arranged away from the elastic plate portion to the second side, and each of the pair of holding portions has an engagement portion that can be positioned between the first protrusion portion and the elastic plate portion in a held state in which the pair of holding portions are bent toward the first side via the hinge portion.

[0007] One aspect of the refrigerant distribution device according to the present disclosure is a refrigerant distribution device that is included in an air conditioner and distributes refrigerant from an outdoor unit to a plurality of indoor units, and includes: a first refrigerant pipe to which a refrigerant pipe extending from the outdoor unit is connected; a plurality of second refrigerant pipes connected to the first refrigerant pipe and to which refrigerant pipes extending from the plurality of indoor units are respectively connected; a case having a mounting wall portion with a through hole formed therein and accommodating at least a portion of the first refrigerant pipe and at least a portion of the plurality of second refrigerant pipes inside; and the above-mentioned bush part attached to the through hole. Effect of the Invention

[0008] According to the present disclosure, it is possible to prevent a bush component from coming off a through hole in a refrigerant distribution device or the like. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram showing an air conditioner equipped with a refrigerant distribution device according to an embodiment. [Diagram 2] FIG. 2 is a partially exploded perspective view showing the refrigerant distribution device according to the embodiment. [Diagram 3] FIG. 4 is a perspective view showing a mounting wall portion and a bush component in the embodiment. [Figure 4] FIG. 4 is an exploded perspective view showing a mounting wall portion and a bush component according to the embodiment. [Diagram 5] FIG. 2 is a perspective view showing a bush part according to the embodiment. [Figure 6] FIG. 2 is an exploded perspective view showing a bush component according to an embodiment. [Figure 7] 7 is an exploded perspective view showing the bush component in the embodiment, in which the bush component is viewed from an angle different from that in FIG. 6. [Figure 8] FIG. 4 is a rear view of the bush component according to the embodiment. [Figure 9] 9 is a cross-sectional view showing the bush component in the embodiment, taken along line IX-IX in FIG. 8. [Figure 10] 10 is a cross-sectional view showing the bush component in the embodiment, taken along line XX in FIG. 9. [Figure 11] FIG. 4 is a perspective view showing a holder of the bush component according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiment, and can be changed as desired within the scope of the technical idea of ​​the present disclosure. In addition, in the following drawings, the scale and number of each structure may be different from the scale and number of the actual structure in order to make each configuration easier to understand.

[0011] FIG. 1 is a schematic diagram showing an air conditioner 100 equipped with a refrigerant distribution device 30 according to an embodiment of the present disclosure. As shown in FIG. 1, the air conditioner 100 includes an outdoor unit 10, a plurality of indoor units 20, and a refrigerant distribution device 30. The plurality of indoor units 20 are disposed inside a room R. The outdoor unit 10 is disposed outside the room R. The plurality of indoor units 20 are connected to one outdoor unit 10 via the refrigerant distribution device 30. Note that FIG. 1 shows a state in which the plurality of indoor units 20 are disposed inside one room R, but is not limited to this. The plurality of indoor units 20 may be disposed inside different rooms R.

[0012] The refrigerant distribution device 30 can connect multiple indoor units 20 to one outdoor unit 10. Two refrigerant pipes 11a, 11b extending from the outdoor unit 10 and two refrigerant pipes 21a, 21b extending from each of the multiple indoor units 20 are connected to the refrigerant distribution device 30. The refrigerant distribution device 30 is disposed, for example, in the ceiling of the room R.

[0013] The refrigerant distribution device 30 is a device that distributes refrigerant from the outdoor unit 10 to a plurality of indoor units 20. Examples of the refrigerant include fluorine-based refrigerants with a low global warming potential (GWP: Global Warming Potential), or hydrocarbon-based refrigerants. The refrigerant flows from one of the refrigerant pipes 11a and 11b extending from the outdoor unit 10 to the refrigerant distribution device 30, and branches from the refrigerant distribution device 30 and flows to each of the plurality of indoor units 20. The refrigerant flowing from the refrigerant distribution device 30 to each indoor unit 20 flows through one of the refrigerant pipes 21a and 21b to the indoor unit 20, and returns to the refrigerant distribution device 30 through the other of the refrigerant pipes 21a and 21b. The refrigerant that has returned to the refrigerant distribution device 30 returns to the outdoor unit 10 through the other of the refrigerant pipes 11a and 11b. In this way, the refrigerant circulates between the outdoor unit 10 and the plurality of indoor units 20 via the refrigerant distribution device 30.

[0014] FIG. 2 is a partially exploded perspective view showing the refrigerant distribution device 30. In FIG. 2, the D1 axis, D2 axis, and D3 axis are shown, and the directions along each axis are defined to explain each part of the refrigerant distribution device 30. The direction along the D1 axis is called the "depth direction D1". The direction along the D2 axis is called the "width direction D2". The direction along the D3 axis is called the "height direction D3". The depth direction D1, width direction D2, and height direction D3 are directions that are perpendicular to each other. The side of the depth direction D1 toward which the arrow of the D1 axis points (+D1 side) is called the "one side of the depth direction", and the side opposite to the side toward which the arrow of the D1 axis points (-D1 side) in the depth direction D1 is called the "other side of the depth direction". The side of the width direction D2 toward which the arrow of the D2 axis points (+D2 side) is called the "one side of the width direction", and the side opposite to the side toward which the arrow of the D2 axis points (-D2 side) in the width direction D2 is called the "other side of the width direction". The side of the height direction D3 toward which the arrow of the D3 axis points (+D3 side) is called the "one side of the height direction", and the side opposite to the side toward which the arrow of the D3 axis points (-D3 side) in the height direction D3 is called the "other side of the height direction".

[0015] Note that the depth direction D1, width direction D2, and height direction D3 are merely names for explaining the relative positional relationship of each part of the refrigerant distribution device 30, and do not limit the posture in which the refrigerant distribution device 30 is arranged.

[0016] As shown in Fig. 2, in this embodiment, the refrigerant distribution device 30 has a generally rectangular parallelepiped shape that is flattened in the height direction D3. The refrigerant distribution device 30 is fixed to a ceiling slab or the like in the position shown in Fig. 2. The refrigerant distribution device 30 includes a case 31, a first refrigerant pipe 61, a plurality of second refrigerant pipes 62, a control unit 32, and a bush component 40.

[0017] The case 31 is a substantially rectangular box-like shape that is flattened in the height direction D3. The case 31 is formed, for example, by combining a plurality of sheet metal members. The case 31 accommodates a portion of the first refrigerant pipe 61, a portion of the plurality of second refrigerant pipes 62, and the control unit 32 inside. The case 31 is open on the other side in the depth direction (-D1 side). The case 31 has a removable control unit cover 31b. FIG. 2 shows a state in which the control unit cover 31b is removed. The control unit cover 31b has a portion that constitutes a wall portion located on one side in the depth direction (+D1 side) of the walls that constitute the case 31, and a portion that constitutes a part of the wall portion located on the other side in the height direction (-D3 side) of the walls that constitute the case 31.

[0018] The case 31 has a mounting wall 31a. In this embodiment, the mounting wall 31a is a portion on one side in the depth direction (+D1 side) of a wall portion located on the other side in the width direction (-D2 side) among the walls constituting the case 31. The mounting wall 31a is in the shape of a rectangular plate. The plate surface of the mounting wall 31a faces the width direction D2. More specifically, the plate surface of the mounting wall 31a is perpendicular to the width direction D2.

[0019] FIG. 3 is a perspective view showing the mounting wall portion 31a and the bush component 40. FIG. 4 is an exploded perspective view showing the mounting wall portion 31a and the bush component 40. As shown in FIG. 3 and FIG. 4, a through hole 31c is formed in the mounting wall portion 31a. The through hole 31c penetrates the mounting wall portion 31a in the width direction D2. The through hole 31c is a rectangular hole. More specifically, in this embodiment, the through hole 31c is a square hole with rounded corners. A plurality of through holes 31c are formed in the mounting wall portion 31a. In this embodiment, four through holes 31c are formed in the mounting wall portion 31a.

[0020] In the present disclosure, the term "rectangle shape" includes not only a strict rectangular shape but also an approximately rectangular shape. The term "approximately rectangular shape" includes a rectangular shape with at least one of the four corners chamfered. The term "approximately rectangular shape" may be a rectangular shape with at least one of the four corners rounded and chamfered, or may be a rectangular shape with at least one of the four corners cornered and chamfered. In the present embodiment, the through hole 31c is a rectangular shape with four corners rounded and chamfered.

[0021] The first refrigerant pipe 61 shown in FIG. 2 is a pipe to which the refrigerant pipes 11a and 11b extending from the outdoor unit 10 are connected. The first refrigerant pipe 61 extends in the width direction D2. In this embodiment, the first refrigerant pipe 61 includes two pipes, a first refrigerant pipe 61a and a first refrigerant pipe 61b. The first refrigerant pipe 61a is a gas pipe, and the first refrigerant pipe 61b is a liquid pipe. For example, a gaseous refrigerant flows in the first refrigerant pipe 61a. For example, a gas-liquid two-phase refrigerant flows in the first refrigerant pipe 61b. The inner diameter of the first refrigerant pipe 61a is larger than the inner diameter of the first refrigerant pipe 61b. The two first refrigerant pipes 61a and 61b are arranged side by side in the depth direction D1.

[0022] The first refrigerant pipe 61a has a first connection portion 61c and a second connection portion 61e. The first refrigerant pipe 61b has a first connection portion 61d and a second connection portion 61f. The first connection portions 61c and 61d are portions to which the refrigerant pipes 11a and 11b extending from the outdoor unit 10 can be connected from one width direction side (+D2 side) of the case 31. The second connection portions 61e and 61f are portions to which the refrigerant pipes 11a and 11b extending from the outdoor unit 10 can be connected from the other width direction side (-D2 side) of the case 31.

[0023] 1 and 2 show a case where the refrigerant pipe 11a is connected to the second connection portion 61e, and the refrigerant pipe 11b is connected to the second connection portion 61f. In a state where the refrigerant pipes 11a and 11b extending from the outdoor unit 10 are connected to one of the connections between the first connection portions 61c and 61d and the second connection portions 61e and 61f, the other connection portion between the first connection portions 61c and 61d and the second connection portions 61e and 61f is in a blocked state. That is, in the example of FIG. 1 and FIG. 2, the first connection portions 61c and 61d are in a blocked state.

[0024] The first connection parts 61c, 61d protrude from the case 31 to one side in the width direction through holes formed in a wall part on one side in the width direction (+D2 side) of the case 31. The second connection parts 61e, 61f protrude from the case 31 to the other side in the width direction through holes formed in a wall part on the other side in the width direction (-D2 side) of the case 31. The second connection parts 61e, 61f protrude to the other side in the width direction from a portion of the wall part on the other side in the width direction of the case 31 that is located on the other side in the depth direction (-D1 side) of the mounting wall part 31a.

[0025] The second refrigerant pipes 62 are pipes to which the refrigerant pipes 21a, 21b extending from the outdoor units 10 are respectively connected. The second refrigerant pipes 62 extend in the depth direction D1. The second refrigerant pipes 62 include a plurality of pairs of second refrigerant pipes 62a, 62b. The second refrigerant pipes 62a are gas pipes, and the second refrigerant pipes 62b are liquid pipes. For example, a gaseous refrigerant flows in the second refrigerant pipes 62a. For example, a gas-liquid two-phase refrigerant flows in the second refrigerant pipes 62b. The inner diameter of the second refrigerant pipes 62a is larger than the inner diameter of the second refrigerant pipes 62b. The second refrigerant pipes 62a, 62b protrude toward the other depth direction side from the case 31 through an opening on the other depth direction side (-D1 side) of the case 31.

[0026] As shown in Fig. 1, a pair of refrigerant pipes 21a, 21b extending from each indoor unit 20 is connected to each pair of second refrigerant pipes 62a, 62b. Each second refrigerant pipe 62a is connected to each refrigerant pipe 21a. Each second refrigerant pipe 62b is connected to each refrigerant pipe 21b. The second refrigerant pipes 62a are connected to the first refrigerant pipes 61a. The second refrigerant pipes 62b are connected to the first refrigerant pipes 61b.

[0027] As shown in FIG. 2, the control unit 32 is accommodated in a portion of the inside of the case 31 on one side in the depth direction (+D1 side). The control unit 32 has, for example, a control board on which a plurality of electronic components are attached. The control unit 32 controls a plurality of solenoid valves (not shown). The plurality of solenoid valves are provided in the plurality of second refrigerant pipes 62b, which are liquid pipes. Each solenoid valve can open and close the inside of each second refrigerant pipe 62b. The plurality of solenoid valves are, for example, linear expansion valves (LEV). Each solenoid valve can reduce the pressure of the refrigerant flowing through each second refrigerant pipe 62b. The control unit 32 adjusts the amount of refrigerant flowing to each indoor unit 20 by controlling the opening degree of each solenoid valve.

[0028] Next, the bush part 40 will be described in detail. In the following description of the bush part 40, the X-axis, Y-axis, and Z-axis are shown in Figs. 2 to 11, and the bush part 40 will be described with the directions along each axis defined. The direction along the X-axis is called the "front-rear direction X". The direction along the Y-axis is called the "left-right direction Y". The direction along the Z-axis is called the "up-down direction Z". The front-rear direction X, the left-right direction Y, and the up-down direction Z are perpendicular to each other. The side (+X side) of the front-rear direction X toward which the arrow of the X-axis faces is called the "front side", and the opposite side (-X side) of the front-rear direction X to the side toward which the arrow of the X-axis faces is called the "rear side". The side (+Y side) of the left-right direction Y toward which the arrow of the Y-axis faces is called the "right side", and the opposite side (-Y side) of the left-right direction Y to the side toward which the arrow of the Y-axis faces is called the "left side". The side of the Z axis arrow in the vertical direction Z (+Z side) is called the "upper side," and the side opposite the side of the Z axis arrow in the vertical direction Z (-Z side) is called the "lower side."

[0029] 5 to 11 show a center line C passing through the center of the bush component 40 when viewed in the front-rear direction X. The center line C is a virtual line that passes through the center of the bush component 40 in the up-down direction Z and the center of the bush component 40 in the left-right direction Y, and extends in the front-rear direction X. In the following description, in the left-right direction Y, the side closer to the center line C is referred to as the "inner side in the left-right direction Y," and the side farther from the center line C is referred to as the "outer side in the left-right direction Y." In addition, in the up-down direction Z, the side closer to the center line C is referred to as the "inner side in the up-down direction Z," and the side farther from the center line C is referred to as the "outer side in the up-down direction Z."

[0030] In this embodiment, the front-rear direction X is the width direction D2 in Fig. 2, the left-right direction Y is the depth direction D1 in Fig. 2, and the up-down direction Z is the height direction D3 in Fig. 2. The front side (+X side) is the other side in the width direction (-D2 side), and the rear side (-X side) is one side in the width direction (+D2 side). The right side (+Y side) is one side in the depth direction (+D1 side), and the left side (-Y side) is the other side in the depth direction (-D1 side). The upper side (+Z side) is one side in the height direction (+D3 side), and the lower side (-Z side) is the other side in the height direction (-D3 side).

[0031] In this embodiment, the front-rear direction X corresponds to the "first direction", the left-right direction Y corresponds to the "second direction", and the up-down direction Z corresponds to the "third direction". The front side (+X side) corresponds to the "first side" in the first direction, and the rear side (-X side) corresponds to the "second side" opposite to the first side in the first direction. The front-rear direction X, the left-right direction Y, and the up-down direction Z are names merely for explaining the relative positional relationship of each portion of the bush component 40, and do not limit the posture in which the bush component 40 is disposed.

[0032] Furthermore, the correspondence relationships between the depth direction D1, width direction D2, and height direction D3 shown in FIG. 2 and the front-rear direction X, left-right direction Y, and up-down direction Z shown in FIGS. 2 to 11 are not particularly limited, and may be relationships other than those described above.

[0033] 3, a plurality of bush components 40 are provided. The plurality of bush components 40 are attached to a plurality of through holes 31c that penetrate the mounting wall portion 31a in the front-rear direction X. In the present embodiment, four bush components 40 are provided.

[0034] FIG. 5 is a perspective view showing the bush component 40. FIG. 6 is an exploded perspective view showing the bush component 40. FIG. 7 is an exploded perspective view showing the bush component 40, in which the bush component 40 is viewed from an angle different from that in FIG. 6. FIG. 8 is a view of the bush component 40 viewed from the rear side (-X side). FIG. 9 is a cross-sectional view showing the bush component 40, taken along line IX-IX in FIG. 8. FIG. 10 is a cross-sectional view showing the bush component 40, taken along line XX in FIG. 9. FIG. 11 is a perspective view showing a holder 41, described later, of the bush component 40.

[0035] As shown in Figs. 5 to 7, the bush part 40 includes a holder 41 and an elastic bush 42. The holder 41 and the elastic bush 42 are connected to each other. The holder 41 holds the elastic bush 42. The holder 41 is located on the rear side (-X side) of the elastic bush 42. In this embodiment, the holder 41 is made of resin. The holder 41 is integrally molded, for example, by mold molding such as injection molding. The elastic bush 42 is made of an elastic body. In this embodiment, the elastic bush 42 is made of rubber. The Young's modulus of elasticity of the elastic bush 42 is smaller than the Young's modulus of elasticity of the holder 41. The elastic bush 42 is integrally molded, for example, by mold molding such as injection molding.

[0036] As shown in FIG. 6, the elastic bush 42 has an elastic plate portion 42a, a first elastic frame portion 42b, a second elastic frame portion 42c, and a pair of first protrusion portions 42d, 42e. The elastic plate portion 42a is a plate-like plate with a plate surface facing the front-rear direction X. The plate surface of the elastic plate portion 42a is perpendicular to the front-rear direction X. When viewed in the front-rear direction X, the elastic plate portion 42a is a quadrangle having a pair of sides extending in the left-right direction Y and a pair of sides extending in the up-down direction Z. In this embodiment, when viewed in the front-rear direction X, the elastic plate portion 42a is a square with rounded corners. As shown in FIG. 2, the elastic plate portion 42a is a portion that covers the through hole 31c formed in the mounting wall portion 31a from the front side (+X side). The front surface of the elastic plate portion 42a is exposed to the outside of the case 31. The plate thickness of the elastic plate portion 42a is relatively thin.

[0037] In the elastic plate portion 42a, a portion located inside the first elastic frame portion 42b as viewed in the front-rear direction X can be formed with wiring holes 42g, for example, by making a cut. As shown in FIG. 8, in this embodiment, in the elastic plate portion 42a, a portion located inside the holder main body portion 41t as viewed in the front-rear direction X can be formed with four wiring holes 42g. The four wiring holes 42g include two wiring holes 42g arranged in the left-right direction Y and two wiring holes 42g arranged below the two wiring holes 42g. The wiring holes 42g are formed, for example, by making a cross cut in the elastic plate portion 42a. In FIG. 8, the wiring holes 42g are shown as a schematic circle. The wiring 70 passing through the through hole 31c is passed through the wiring holes 42g.

[0038] The wiring 70 includes a wiring extending from the outdoor unit 10 and connected to the control unit 32 in the case 31, and a wiring extending from the indoor units 20 and connected to the control unit 32 in the case 31. The wiring extending from the outdoor unit 10 and connected to the control unit 32 in the case 31, and the wiring extending from the outdoor unit 10 and connected to the control unit 32 in the case 31 each include a power line and a communication line. For example, only one wiring 70 may be passed through one wiring hole 42g, or multiple wirings may be bundled and passed through. The inner edge of the wiring hole 42g elastically deforms and adheres to the outer surface of the wiring 70. Therefore, it is possible to prevent foreign matter such as water from entering the inside of the case 31 through the wiring hole 42g.

[0039] When installing the refrigerant distribution device 30, the worker installing the refrigerant distribution device 30 forms wiring holes 42g in the elastic plate portion 42a as appropriate according to the number of wires 70. As described above, in the present embodiment, four wiring holes 42g can be formed in one elastic plate portion 42a, but depending on the total number of wires 70, only one or more and three or less wiring holes 42g may be formed in one elastic plate portion 42a, or there may be a bush component 40 in which no wiring holes 42g are formed in the elastic plate portion 42a.

[0040] As shown in FIG. 6, the first elastic frame portion 42b protrudes from the elastic plate portion 42a toward the rear side (-X side). The first elastic frame portion 42b is in the shape of a quadrangular frame. More specifically, the first elastic frame portion 42b is in the shape of a square frame with rounded corners. The first elastic frame portion 42b is inserted into the inside of an outer wall portion 41b of a holder main body portion 41t described later. The first elastic frame portion 42b is disposed away from the outer peripheral edge portion of the elastic plate portion 42a toward the inside. In other words, when viewed in the front-rear direction X, the outer peripheral edge portion of the elastic plate portion 42a is positioned outside the first elastic frame portion 42b.

[0041] In the present disclosure, the term "square frame" refers to a shape in which the outer edge of the frame is a "square shape" as described above, and the inner edge of the frame may have any shape. In the present disclosure, the term "square frame" refers to a shape that is not only strictly square, but also approximately square. The term "approximately square frame" refers to a shape in which at least one of the four corners is chamfered. The term "approximately square frame" refers to a shape in which at least one of the four corners is rounded or chamfered. In the present embodiment, the first elastic frame portion 42b is a square frame with four rounded corners.

[0042] The first elastic frame portion 42b has a pair of vertical frame sides 42h extending in the up-down direction Z and a pair of horizontal frame sides 42i extending in the left-right direction Y. The pair of vertical frame sides 42h are arranged at a distance from each other in the left-right direction Y. The pair of horizontal frame sides 42i are arranged at a distance from each other in the up-down direction Z. The upper ends of the pair of vertical frame sides 42h are connected to each other by the horizontal frame side portion 42i located on the upper side of the pair of horizontal frame sides 42i. The lower ends of the pair of vertical frame sides 42h are connected to each other by the horizontal frame side portion 42i located on the lower side of the pair of horizontal frame sides 42i.

[0043] The pair of vertical frame side portions 42h are generally rectangular plate-shaped extending in the up-down direction Z. The plate surfaces of the pair of vertical frame side portions 42h face the left-right direction Y. The pair of horizontal frame side portions 42i are generally rectangular plate-shaped extending in the left-right direction Y. The plate surfaces of the pair of horizontal frame side portions 42i face the up-down direction Z. In this embodiment, the pair of vertical frame side portions 42h correspond to a "pair of second frame side portions" of the first elastic frame portion 42b arranged opposite each other in the left-right direction Y.

[0044] The second elastic frame portion 42c protrudes from the outer peripheral edge of the elastic plate portion 42a toward the rear side (-X side). The second elastic frame portion 42c is a rectangular frame surrounding the first elastic frame portion 42b. In the present embodiment, the second elastic frame portion 42c is a rectangular frame with four rounded corners. More specifically, the second elastic frame portion 42c is a square frame with rounded corners. When viewed in the front-rear direction X, the second elastic frame portion 42c is disposed away from the outside of the first elastic frame portion 42b. The rear end of the second elastic frame portion 42c is located forward (+X side) of the rear end of the first elastic frame portion 42b. The width of each frame side portion constituting the second elastic frame portion 42c is larger than the width of each frame side portion constituting the first elastic frame portion 42b.

[0045] The "width of each frame side portion constituting the frame portion" refers to the dimension of each frame side portion in a direction perpendicular to the direction in which each frame side portion constituting the frame portion extends when viewed in the direction in which the frame portion opens. For example, the width of the vertical frame side portion 42h constituting the first elastic frame portion 42b refers to the dimension of the vertical frame side portion 42h in the left-right direction Y perpendicular to the up-down direction Z in which the vertical frame side portion 42h extends when the first elastic frame portion 42b is viewed in the front-rear direction X.

[0046] 9 and 10, the rear (-X side) surface of the second elastic frame portion 42c contacts the front (+X side) surface 31e of the mounting wall portion 31a. The front surface 31e of the mounting wall portion 31a is the outer surface of the case 31. Note that a small gap may be provided between the rear surface of the second elastic frame portion 42c and the front surface 31e of the mounting wall portion 31a.

[0047] As shown in FIG. 6, a second groove portion 42f having a rectangular frame shape is formed between the first elastic frame portion 42b and the second elastic frame portion 42c. In the present embodiment, the second groove portion 42f has a rectangular frame shape with four rounded corners. More specifically, the second groove portion 42f has a square frame shape with rounded corners. The second groove portion 42f is formed by being surrounded by the elastic plate portion 42a, the first elastic frame portion 42b, and the second elastic frame portion 42c. The second groove portion 42f opens to the rear side (-X side). The groove bottom surface of the second groove portion 42f is a part of the rear surface of the elastic plate portion 42a.

[0048] The pair of first protrusions 42d, 42e are formed on the inner side surface of the first elastic frame portion 42b. The pair of first protrusions 42d, 42e are respectively formed in the center in the up-down direction Z of a pair of vertical frame side portions 42h of the first elastic frame portion 42b that are arranged opposite each other in the left-right direction Y. The first protrusion 42d is formed on the left side (-Y side) vertical frame side portion 42h. The first protrusion 42e is formed on the right side (+Y side) vertical frame side portion 42h.

[0049] The pair of first protrusions 42d, 42e is formed on the rear side (-X side) of each vertical frame side 42h. The pair of first protrusions 42d, 42e protrudes inward in the left-right direction Y from each vertical frame side 42h. The pair of first protrusions 42d, 42e are arranged opposite each other with a gap in the left-right direction Y. The pair of first protrusions 42d, 42e are substantially rectangular parallelepipeds extending in the up-down direction Z. The pair of first protrusions 42d, 42e are arranged rearward and away from the elastic plate portion 42a. The rear end faces of the pair of first protrusions 42d, 42e are arranged at the same position as the rear end of the first elastic frame portion 42b in the front-rear direction X.

[0050] The holder 41 has a holder main body 41t, a flange portion 41c, a pair of claw portions 43, 44, and a pair of holding portions 45, 46. The holder main body 41t is in the shape of a rectangular frame. In this embodiment, the holder main body 41t is in the shape of a rectangular frame with four rounded corners. More specifically, the holder main body 41t is in the shape of a square frame with rounded corners. The inside of the holder main body 41t is open on both sides in the front-rear direction X.

[0051] The holder main body 41t has a pair of vertical frame sides 41u extending in the up-down direction Z and a pair of horizontal frame sides 41v extending in the left-right direction Y. The pair of vertical frame sides 41u are arranged at a distance from each other in the left-right direction Y. The pair of horizontal frame sides 41v are arranged at a distance from each other in the up-down direction Z. The upper ends of the pair of vertical frame sides 41u are connected to each other by the horizontal frame side portion 41v located at the upper side of the pair of horizontal frame sides 41v. The lower ends of the pair of vertical frame sides 41u are connected to each other by the horizontal frame side portion 41v located at the lower side of the pair of horizontal frame sides 41v.

[0052] In this embodiment, the pair of vertical frame sides 41u correspond to a "pair of first frame sides" of the holder main body 41t arranged opposite each other in the left-right direction Y perpendicular to the front-rear direction X. In this embodiment, the pair of horizontal frame sides 41v correspond to a "pair of third frame sides" of the holder main body 41t arranged opposite each other in the up-down direction Z perpendicular to both the front-rear direction X and the left-right direction Y.

[0053] As shown in Fig. 7, the holder main body 41t has a rear wall 41a, an outer wall 41b, and inner walls 41d and 41e. As shown in Fig. 6, the rear wall 41a has a rectangular frame shape when viewed in the front-rear direction X. The rear wall 41a has a plate shape with a plate surface facing the front-rear direction X. The plate surface of the rear wall 41a is perpendicular to the front-rear direction X.

[0054] The outer wall portion 41b protrudes from the outer edge of the rear wall portion 41a toward the front side (+X side). As shown in FIG. 7, the outer wall portion 41b is a rectangular frame shape that opens toward the front side. In this embodiment, the outer wall portion 41b is a rectangular frame shape with four rounded corners. More specifically, the outer wall portion 41b is a square frame shape with rounded corners. The outer wall portion 41b has a pair of vertical frame side portions extending in the up-down direction Z and a pair of horizontal frame side portions extending in the left-right direction Y. The vertical frame side portions of the outer wall portion 41b are substantially rectangular plate-shaped with a plate surface facing the left-right direction Y and extending in the up-down direction Z. The horizontal frame side portions of the outer wall portion 41b are substantially rectangular plate-shaped with a plate surface facing the up-down direction Z and extending in the left-right direction Y. A hole portion 41r is formed in the center in the left-right direction Y of the horizontal frame side portion located on the upper side of the outer wall portion 41b, and in the center in the left-right direction Y of the horizontal frame side portion located on the lower side of the outer wall portion 41b, penetrating each horizontal frame side portion in the up-down direction Z.

[0055] The inner walls 41d, 41e protrude forward (+X side) from the inner edge of the rear wall 41a. The inner wall 41d protrudes forward from an upper portion of the inner edge of the rear wall 41a. The inner wall 41e protrudes forward from a lower portion of the inner edge of the rear wall 41a. The inner wall 41d and the inner wall 41e face each other with a gap in between in the vertical direction Z. The inner wall 41d is located above the inner wall 41e and is spaced apart from each other. The inner wall 41d and the inner wall 41e are disposed symmetrically in the vertical direction Z across the center line C.

[0056] The inner wall portion 41d has a main body wall portion 41f and a pair of bent wall portions 41g, 41h. The main body wall portion 41f extends in the left-right direction Y. The main body wall portion 41f is a substantially rectangular plate-like shape with a plate surface facing the up-down direction Z. The main body wall portion 41f is disposed at a distance below the upper wall portion of the outer wall portion 41b, i.e., the upper horizontal frame side portion. A hole portion 41s is formed in the center of the main body wall portion 41f in the left-right direction Y, penetrating the main body wall portion 41f in the up-down direction Z. The hole portion 41s of the inner wall portion 41d is disposed opposite to a hole portion 41r formed in the upper horizontal frame side portion of the outer wall portion 41b at a distance below the hole portion 41r.

[0057] The pair of curved walls 41g, 41h protrude downward from both ends of the main body wall 41f in the left-right direction Y. The curved wall 41g protrudes downward from the left (-Y side) end of the main body wall 41f. The curved wall 41h protrudes downward from the right (+Y side) end of the main body wall 41f. The pair of curved walls 41g, 41h are plate-shaped with their plate surfaces facing in the left-right direction Y.

[0058] The lower portion of the bent wall portion 41g is the engaged portion 41i. The plate thickness of the engaged portion 41i is smaller than the plate thickness of the upper portion of the bent wall portion 41g. The lower portion of the bent wall portion 41h is the engaged portion 41j. The plate thickness of the engaged portion 41j is smaller than the plate thickness of the upper portion of the bent wall portion 41h. The pair of engaged portions 41i, 41j protrude downward. The lower ends of the pair of engaged portions 41i, 41j are located above the center line C.

[0059] The shape of the inner wall portion 41e is similar to that of the inner wall portion 41d, except that it is inverted in the up-down direction Z. A hole 41s is also formed in the center of the main body wall portion of the inner wall portion 41e in the left-right direction Y. The hole 41s of the inner wall portion 41e is disposed opposite to and spaced above the hole 41r formed in the lower horizontal frame side portion of the outer wall portion 41b.

[0060] The inner wall portion 41e has a pair of engaged portions 41k, 41m, similar to the inner wall portion 41d. The engaged portion 41k is disposed below the engaged portion 41i, facing the engaged portion 41i with a gap therebetween. The engaged portion 41m is disposed below the engaged portion 41j, facing the engaged portion 41j with a gap therebetween. The pair of engaged portions 41k, 41m protrude upward. The pair of engaged portions 41k, 41m are located below the center line C.

[0061] In this embodiment, the vertical frame side portion 41u located on the left side (-Y side) of the pair of vertical frame sides 41u in the holder main body 41t is composed of the vertical frame side portion located on the left side of the rectangular frame-shaped rear wall portion 41a, the vertical frame side portion located on the left side of the rectangular frame-shaped outer wall portion 41b, the bent wall portion 41g on the left side of the inner wall portion 41d, and the bent wall portion on the left side of the inner wall portion 41e. The vertical frame side portion 41u located on the right side (+Y side) of the pair of vertical frame sides 41u is composed of the vertical frame side portion located on the right side of the rear wall portion 41a, the vertical frame side portion located on the right side of the outer wall portion 41b, the bent wall portion 41h on the right side of the inner wall portion 41d, and the bent wall portion on the right side of the inner wall portion 41e.

[0062] The upper horizontal frame side portion 41v of the pair of horizontal frame side portions 41v in the holder main body portion 41t is composed of the horizontal frame side portion located on the upper side of the rear wall portion 41a, the horizontal frame side portion located on the upper side of the outer wall portion 41b, and the main body wall portion 41f of the inner wall portion 41d. The lower horizontal frame side portion 41v of the pair of horizontal frame side portions 41v is composed of the horizontal frame side portion located on the lower side of the rear wall portion 41a, the horizontal frame side portion located on the lower side of the outer wall portion 41b, and the main body wall portion of the inner wall portion 41e.

[0063] 9 and 10, the holder main body 41t is inserted through a through hole 31c formed in the mounting wall 31a. The holder main body 41t is inserted through the through hole 31c from the front side (+X side) and into the case 31. The holder main body 41t protrudes rearward beyond a rear (-X side) surface 31d of the mounting wall 31a. The rear surface 31d of the mounting wall 31a is part of the inner surface of the case 31.

[0064] As shown in FIG. 7, the holder main body 41t is formed with a first groove 41p. The first groove 41p is a groove extending in a rectangular frame shape along the holder main body 41t having a rectangular frame shape. The first groove 41p is open to the front side (+X side). The first groove 41p is formed between the outer wall 41b and the inner wall parts 41d and 41e. The first groove 41p is surrounded by the outer wall part 41b, the inner wall parts 41d and 41e, and the rear wall part 41a. The groove bottom surface of the first groove 41p is the front surface of the rear wall part 41a. As shown in FIG. 9, the first elastic frame part 42b of the elastic bush 42 is inserted from the front side into the first groove 41p.

[0065] As shown in FIG. 7, a pair of openings 48a, 48b are formed in the pair of vertical frame sides 41u, connecting the inside of the rectangular frame-shaped holder main body 41t and the inside of the first groove 41p. The opening 48a is formed in the left (-Y side) vertical frame side 41u. The opening 48a is formed between the engaged part 41i of the inner wall 41d and the engaged part 41k of the inner wall 41e in the up-down direction Z. The opening 48b is formed in the right (+Y side) vertical frame side 41u. The opening 48b is formed between the engaged part 41j of the inner wall 41d and the engaged part 41m of the inner wall 41e in the up-down direction Z. The openings 48a, 48b open to the inside in the left-right direction Y and connect to the inside of the holder main body 41t. The openings 48a, 48b open to the outside in the left-right direction Y and connect to the inside of the first groove 41p. The openings 48a, 48b are generally rectangular in shape and are long in the up-down direction Z. The openings 48a, 48b are open to the front side (+X side).

[0066] As shown in FIG. 6, a pair of second protrusions 47a, 47b are formed on each of the pair of vertical frame side portions 41u. The second protrusion 47a is formed on the left (-Y side) vertical frame side portion 41u. The second protrusion 47b is formed on the right (+Y side) vertical frame side portion 41u. The pair of second protrusions 47a, 47b protrude inward in the left-right direction Y from each of the pair of vertical frame side portions 41u. In this embodiment, the pair of second protrusions 47a, 47b are formed on the inner edge of the rear wall portion 41a. The pair of second protrusions 47a, 47b are arranged opposite each other in the left-right direction Y across the center line C. The pair of second protrusions 47a, 47b are elongated and substantially rectangular parallelepiped-shaped extending in the up-down direction Z.

[0067] As shown in FIG. 7, the flange portion 41c protrudes from the holder main body portion 41t. More specifically, the flange portion 41c protrudes from the holder main body portion 41t to the outside in the radial direction centered on the center line C. The flange portion 41c is formed at the end of the front side (+X side) of the outer surface of the outer wall portion 41b. The flange portion 41c is in the shape of a rectangular frame surrounding the holder main body portion 41t. In this embodiment, the flange portion 41c is in the shape of a rectangular frame with four rounded chamfered corners. More specifically, the flange portion 41c is in the shape of a square frame with rounded corners. The flange portion 41c is disposed along the end of the front side of the outer wall portion 41b.

[0068] As shown in Figs. 9 and 10, the flange portion 41c is disposed facing the front side (+X side) of the periphery of the through hole 31c formed in the mounting wall portion 31a. As a result, the flange portion 41c is hooked from the front side in the front-rear direction X to the periphery of the through hole 31c. In this embodiment, the rectangular frame-shaped flange portion 41c is hooked from the front side to the entire periphery of the rectangular through hole 31c. In the example of Figs. 9 and 10, the rear side (-X side) surface of the flange portion 41c is in contact with the front side surface 31e of the mounting wall portion 31a. The flange portion 41c is inserted into the second groove portion 42f of the elastic bushing 42. In this embodiment, the flange portion 41c is fitted into the second groove portion 42f.

[0069] As shown in FIG. 9, a pair of claw portions 43, 44 protrude in the up-down direction Z from the holder main body portion 41t. The pair of claw portions 43, 44 are formed on a pair of horizontal frame side portions 41v, respectively. The claw portion 43 is formed on the upper horizontal frame side portion 41v. The claw portion 44 is formed on the lower horizontal frame side portion 41v. The claw portions 43, 44 protrude outward in the up-down direction Z from each horizontal frame side portion 41v. The claw portions 43 and 44 have similar shapes to each other, except that they are arranged symmetrically in the up-down direction Z across the center line C.

[0070] As shown in FIG. 5, the claw portion 43 is connected to the inner edge of a hole portion 41r formed in the upper horizontal frame side of the outer wall portion 41b. The claw portion 43 has a base portion 43a extending from the rear side (-X side) edge of the inner edge of the hole portion 41r to the front side (+X side), and a claw main body portion 43b protruding upward from the front end portion of the base portion 43a. The claw main body portion 43b protrudes upward from the holder main body portion 41t. As shown in FIG. 9, the claw main body portion 43b is disposed facing the rear side of the upper part of the peripheral portion of the through hole 31c. As a result, the claw portion 43 is hooked on the peripheral portion of the through hole 31c from the rear side (-X side) opposite to the front side in the front-rear direction X. The front surface of the claw main body portion 43b is a flat surface perpendicular to the front-rear direction X. The rear surface of the claw main body portion 43b is an inclined surface located forward as it goes upward. The claw main body 43b sandwiches the periphery of the through hole 31c between itself and the flange portion 41c in the front-rear direction X. The upper end of the claw main body 43b protrudes upward beyond the flange portion 41c.

[0071] The claw portion 44 is connected to the inner edge of a hole portion 41r formed in the lower horizontal frame side of the outer wall portion 41b. The claw portion 44 has a base portion 44a extending from the rear (-X side) edge of the inner edge of the hole portion 41r to the front (+X side), and a claw main body portion 44b protruding downward from the front end portion of the base portion 44a. The claw main body portion 44b is disposed opposite to the rear side of the lower part of the peripheral portion of the through hole 31c. As a result, the claw portion 44 is hooked from the rear side on the peripheral portion of the through hole 31c.

[0072] In the example of FIG. 9, each of the claw main bodies 43b, 44b of the pair of claws 43, 44 faces the peripheral portion of the through hole 31c with a gap therebetween, but is not limited thereto. Each of the claw main bodies 43b, 44b may be in contact with the peripheral portion of the through hole 31c. In the example of FIG. 9, when the bush part 40 tries to move forward (to the +X side), each of the claw main bodies 43b, 44b of the pair of claws 43, 44 contacts and gets caught on the peripheral portion of the through hole 31c, so that the bush part 40 is prevented from moving forward. In the example of FIG. 9, when each of the claw main bodies 43b, 44b contacts the peripheral portion of the through hole 31c, the flange portion 41c is separated forward from the peripheral portion of the through hole 31c.

[0073] The pair of claws 43, 44 are elastically deformable in the vertical direction Z. More specifically, the pair of claws 43, 44 are elastically deformable inward in the vertical direction Z with the rear end portions of the bases 43a, 43b connected to the inner edge of the hole 41r as fulcrums. When the bush part 40 is attached to the through hole 31c, the pair of claws 43, 44 elastically deform toward the inner side of the holder main body 41t, i.e., toward the inner side in the vertical direction Z, and pass through the through hole 31c, and are restored to their original shape after passing through the through hole 31c. As a result, the pair of claws 43, 44 are disposed opposite the rear side (-X side) of the peripheral portion of the through hole 31c.

[0074] As shown in FIG. 6, the pair of holding parts 45, 46 are connected to the inner edge of the holder main body part 41t via hinge parts 45d, 46d. The hinge parts 45d, 46d are formed to be thinner than other parts. The hinge parts 45d, 46d are elastically deformable. The pair of holding parts 45, 46 are rotatable around an axis passing through the hinge parts 45d, 46d and extending in the vertical direction Z by the hinge parts 45d, 46d being elastically deformed. The pair of holding parts 45, 46 can be bent forward (+X side) from the state shown in FIG. 6 to hold the elastic bush 42 in the holder 41.

[0075] 6 and 7 show a state in which the pair of holding portions 45, 46 are not bent. Figures 3 to 5 and 8 to 11 show a state in which the pair of holding portions 45, 46 are bent and the elastic bushing 42 is held by the holder 41. Note that the elastic bushing 42 is not shown in Figure 11.

[0076] In the following description, the state of the pair of holding parts 45, 46 shown in Figures 6 and 7, i.e., the state in which the pair of holding parts 45, 46 are not bent, is referred to as the “non-holding state.” Also, the state of the pair of holding parts 45, 46 shown in Figures 3 to 5 and 8 to 11, i.e., the state in which the pair of holding parts 45, 46 are bent and the elastic bushing 42 is held by the holder 41, is referred to as the “holding state.”

[0077] As shown in FIG. 6, the pair of holding portions 45, 46 are connected to the pair of vertical frame side portions 41u. The holding portion 45 is connected to the inner edge of the rear wall portion 41a of the left (-Y side) vertical frame side portion 41u. The holding portion 46 is connected to the inner edge of the rear wall portion 41a of the right (+Y side) vertical frame side portion 41u. The holding portion 45 and the holding portion 46 are arranged opposite to each other with a gap in the left-right direction Y. In the non-holding state, the pair of holding portions 45, 46 protrude inward in the left-right direction Y from each of the pair of vertical frame side portions 41u. The holding portion 45 and the holding portion 46 are arranged symmetrically in the left-right direction Y with the center line C sandwiched therebetween. As shown in FIG. 11, in the holding state, the holding portion 45 is located in the opening 48a. In the holding state, the holding portion 46 is located in the opening 48b. In this embodiment, the holding portions 45, 46 are fitted into the openings 48a, 48b, respectively, in the holding state.

[0078] The holding portion 45 has a pair of arms 45a, 45b, a locking portion 45c, and engagement protrusions 45e, 45f. As shown in FIG. 6, the pair of arms 45a, 45b are connected to the vertical frame side portion 41u via a hinge portion 45d. The pair of arms 45a, 45b are connected to the inner edge of the rear wall portion 41a at positions sandwiching the second protrusion portion 47a in the vertical direction Z via the hinge portion 45d. In the non-holding state, the pair of arms 45a, 45b protrude inward in the left-right direction Y from the vertical frame side portion 41u. As shown in FIG. 11, in the holding state, the pair of arms 45a, 45b are in a position extending in the front-rear direction X and are arranged to sandwich the second protrusion portion 47a in the vertical direction Z.

[0079] The locking portion 45c extends in the vertical direction Z. The locking portion 45c has a generally rectangular parallelepiped shape that is elongated in the vertical direction Z. The locking portion 45c connects the tips of the pair of arms 45a, 45b. The tips of the pair of arms 45a, 45b are inner ends of the pair of arms 45a, 45b in the left-right direction Y in the non-holding state, and are front (+X side) ends of the pair of arms 45a, 45b in the holding state. As shown in FIG. 5, the locking portion 45c can be positioned between the first protrusion 42d and the elastic plate portion 42a in the front-rear direction X in the holding state in which the holding portion 45 is bent to the front (+X side) via the hinge portion 45d.

[0080] 10, in the held state, for example, a small gap is provided between the locking portion 45c and the first protrusion portion 42d in the front-rear direction X, and between the locking portion 45c and the elastic plate portion 42a in the front-rear direction X. Note that, in the held state, the locking portion 45c may be in contact with at least one of the first protrusion portion 42d and the elastic plate portion 42a.

[0081] In the held state, the locking portion 45c sandwiches the vertical frame side portion 42h of the first elastic frame portion 42b between itself and the outer wall portion 41b in the left-right direction Y. In the held state, a small gap is provided between the locking portion 45c and the vertical frame side portion 42h. Note that the locking portion 45c may be in contact with the vertical frame side portion 42h.

[0082] The locking portion 45c sandwiches the first protrusion 42d in the front-rear direction X with the second protrusion 47a in the held state. In other words, the second protrusion 47a sandwiches the first protrusion 42d in the front-rear direction X with the locking portion 45c in the held state. A slight gap is provided between the first protrusion 42d and the second protrusion 47a. Note that the first protrusion 42d and the second protrusion 47a may be in contact with each other.

[0083] As shown in FIG. 6, a pair of engaging protrusions 45e and 45f protrude outward in the vertical direction Z from both ends of the locking portion 45c in the vertical direction Z. The engaging protrusion 45e protrudes upward from the upper end of the locking portion 45c. The engaging protrusion 45f protrudes downward from the lower end of the locking portion 45c. The pair of engaging protrusions 45e and 45f are substantially rectangular plate-shaped. As shown in FIG. 11, the plate surfaces of the pair of engaging protrusions 45e and 45f face the left-right direction Y in the held state.

[0084] The pair of engaging protrusions 45e and 45f are caught by the edge of the opening 48a from the inside of the first groove portion 41p in the held state. Thereby, the pair of engaging protrusions 45e and 45f are caught by the holder main body portion 41t in the held state. In the present embodiment, the pair of engaging protrusions 45e and 45f are caught by the pair of engaged portions 41i and 41k from the outside (-Y side) in the left-right direction Y, respectively, in the held state. When the pair of engaging protrusions 45e and 45f are caught by the pair of engaged portions 41i and 41k in the held state, it is suppressed that the bent holding portion 45 in the held state returns to the non-held state where it is not bent.

[0085] The holding portion 46 has the same configuration as the holding portion 45, except that it is symmetrical in the left-right direction Y. As shown in FIG. 6, the holding portion 46 has a pair of arms 46a, 46b connected to the inner edge of the holder main body portion 41t via a hinge portion 46d, a locking portion 46c, and a pair of engagement protrusions 46e, 46f, like the holding portion 45. As shown in FIG. 10, the locking portion 46c is located between the first protrusion portion 42e and the elastic plate portion 42a in the front-rear direction X in the holding state. As shown in FIG. 11, the pair of engagement protrusions 46e, 46f are hooked to the edge of the opening 48b from inside the first groove portion 41p in the holding state. In this embodiment, the pair of engagement protrusions 46e, 46f are hooked to the pair of engaged portions 41j, 41m from the outside (+Y side) in the left-right direction Y, respectively, in the holding state. In the held state, the pair of engaging projections 46e, 46f are caught by the pair of engaged portions 41j, 41m, thereby preventing the held portion 46 in the bent held state from returning to the unbent non-held state.

[0086] A worker assembling the bush component 40 brings the elastic bush 42 closer to the holder 41 from the front side (+X side), inserts the first elastic frame portion 42b of the elastic bush 42 into the first groove portion 41p formed in the holder 41, and inserts the flange portion 41c of the holder 41 into the second groove portion 42f formed in the elastic bush 42. The worker brings the elastic bush 42 closer to the holder 41 until the flange portion 41c comes into contact with the groove bottom surface of the second groove portion 42f and is fitted into the second groove portion 42f.

[0087] Next, the worker bends the pair of holding parts 45, 46 to the front side (+X side) and fits them into the openings 48a, 48b. At this time, the worker pushes the engaging protrusions 45e, 45f, 46e, 46f of the pair of holding parts 45, 46 into the first groove part 41p through the openings 48a, 48b, and engages the engaging protrusions 45e, 45f, 46e, 46f with the engaged parts 41i, 41k, 41j, 41m, respectively. At this time, at least one of the engaging protrusions 45e, 45f, 46e, 46f and the engaged parts 41i, 41k, 41j, 41m is elastically deformed, so that the engaging protrusions 45e, 45f, 46e, 46f are pushed into the first groove part 41p. As a result, the holding state in which the pair of holding parts 45, 46 are bent is maintained. In the held state, the locking portions 45c, 46c of the pair of holding portions 45, 46 are located between the first protrusions 42d, 42e and the elastic plate portion 42a, so that the first protrusions 42d, 42e are caught by the locking portions 45c, 46c even if the elastic bushing 42 is pulled forward relative to the holder 41. This prevents the elastic bushing 42 from coming off the holder 41 forward.

[0088] The worker who attaches the bush part 40 to the through hole 31c of the mounting wall part 31a brings the bush part 40 close to the through hole 31c from the front side (+X side) and inserts the holder 41 into the through hole 31c. At this time, the rear inclined surfaces of the claw main bodies 43b, 44b of the pair of claw parts 43, 44 contact the peripheral part of the through hole 31c, so that the claw parts 43, 44 are elastically deformed inward in the vertical direction Z. This allows the pair of claw parts 43, 44 to pass through the through hole 31c. The worker inserts the holder 41 into the through hole 31c until the pair of claw parts 43, 44 pass through the through hole 31c and are restored and deformed inside the case 31. The pair of claw parts 43, 44 are restored and deformed inside the case 31, and the pair of claw parts 43, 44 are positioned to be hooked from inside the case 31 on the peripheral part of the through hole 31c, so that the bush part 40 is attached to the through hole 31c.

[0089] According to this embodiment, the pair of holding parts 45, 46 are connected to a pair of vertical frame side parts 41u arranged to face each other in the left-right direction Y perpendicular to the front-rear direction X of the holder main body part 41t. The pair of first protrusion parts 42d, 42e are formed on a pair of vertical frame side parts 42h arranged to face each other in the left-right direction Y of the first elastic frame part 42b, respectively, and are arranged away from the elastic plate part 42a to the rear side (-X side). Each of the pair of holding parts 45, 46 has locking parts 45c, 46c that can be positioned between the first protrusion parts 42d, 42e and the elastic plate part 42a in a holding state in which the pair of holding parts 45, 46 are bent to the front side (+X side) via the hinge parts 45d, 46d. Therefore, as described above, by bending the pair of holding portions 45, 46 and positioning the locking portions 45c, 46c between the first protrusions 42d, 42e and the elastic plate portion 42a, respectively, the locking portions 45c, 46c and the first protrusions 42d, 42e can be hooked onto each other in the front-rear direction X. This makes it possible to suitably prevent the elastic bushing 42 from coming off the holder 41 in the front-rear direction X.

[0090] Moreover, since the flange portion 41c and the claw portions 43, 44 of the holder 41 are caught on the peripheral portion of the through hole 31c from the opposite side in the front-rear direction X, the holder 41 is prevented from coming off from the through hole 31c in the front-rear direction X. Therefore, even if the wire 70 passed through the wiring hole 42g formed in the elastic bush 42 is pulled, for example, forward (+X side) to pull the elastic bush 42 forward, the elastic bush 42 can be prevented from coming off from the holder 41, and the elastic bush 42 can also be prevented from coming off from the through hole 31c together with the holder 41. Therefore, even if the bush component 40 has a rectangular shape when viewed in the front-rear direction X, the bush component 40 can be suitably prevented from coming off from the through hole 31c.

[0091] For example, if the bush part is circular as viewed in the front-rear direction X, the force applied to the bush part from the wiring can be evenly distributed around the entire circumference of the bush part. Therefore, even if the bush part is configured to be made of only an elastic bush, the bush part is unlikely to come off the through hole. However, if the bush part is circular as viewed in the front-rear direction X, the area in which the wiring holes can be formed is likely to be smaller than when the bush part is rectangular as viewed in the front-rear direction X, and the number of wirings that can be passed through the bush part is likely to be smaller. In contrast, according to this embodiment, by making the bush part 40 rectangular as viewed in the front-rear direction X, the area in which the wiring holes 42g can be formed is increased, and the number of wirings 70 that can be passed through the bush part 40 is increased, while the bush part 40 can be suitably prevented from coming off the through hole 31c.

[0092] Also, for example, when a bush part made of a rubber elastic bush is made to have a square shape as viewed in the front-rear direction X, as in the conventional bush part, the elastic bush is directly fitted into the through hole while being elastically deformed. In this case, since the elastic bush has four corners, it is difficult to fit the elastic bush into the through hole. Also, since it is difficult to fit the elastic bush, there is a risk that a part of the elastic bush is not properly fitted into the through hole, and the elastic bush may easily come off from the part that is not properly fitted.

[0093] In contrast, according to the present embodiment, the holder 41 is inserted into the through hole 31c without elastically deforming the elastic bush 42, so that the bush component 40 can be attached to the through hole 31c by the flange portion 41c and the claw portions 43, 44. Therefore, even if the bush component 40 has a rectangular shape when viewed from the front-rear direction X, the bush component 40 can be easily attached to the through hole 31c. In addition, it is possible to prevent a part of the bush component 40 from being unable to be properly attached to the through hole 31c, and more preferably prevent the bush component 40 from coming off the through hole 31c.

[0094] Also, for example, it is conceivable to firmly fix a bush component made of a conventional elastic bush to the through hole using an adhesive. However, in this case, there is a risk that the bush component will come off from the through hole due to deterioration of the adhesive. In contrast, in the present embodiment, the bush component 40 can be stably attached to the through hole 31c as described above without using an adhesive, so that the bush component 40 can be more suitably prevented from coming off.

[0095] Furthermore, according to the present embodiment, the holder main body 41t is formed with the first groove 41p into which the first elastic frame 42b is inserted. This makes it easier for the holder 41 to hold the elastic bushing 42 more stably.

[0096] According to this embodiment, a pair of openings 48a, 48b are formed in the pair of vertical frame side portions 41u, respectively, connecting the inside of the holder main body portion 41t and the inside of the first groove portion 41p. Each of the pair of holding portions 45, 46 has engagement protrusions 45e, 45f, 46e, 46f that hook onto the holder main body portion 41t in the holding state. Therefore, the pair of holding portions 45, 46 that are bent in the holding state can be prevented from returning to their original state. This makes it easy to maintain the state in which the elastic bush 42 is preferably attached to the holder 41. Specifically, in this embodiment, the engagement protrusions 45e, 45f, 46e, 46f hook onto the edges of the openings 48a, 48b from the inside of the first groove portion 41p. Therefore, by pushing the engaging projections 45e, 45f, 46e, and 46f into the openings 48a and 48b when the pair of holding portions 45, 46 are bent, the engaging projections 45e, 45f, 46e, and 46f can be easily and suitably hooked onto the holder main body portion 41t.

[0097] According to the present embodiment, each of the pair of holding parts 45, 46 has a pair of arms 45a, 45b, 46a, 46b connected to the holder main body part 41t via the hinge parts 45d, 46d. The locking parts 45c, 46c connect the tips of the pair of arms 45a, 45b, 46a, 46b. Therefore, the locking parts 45c, 46c can be stably connected to the holder main body part 41t. Also, the pair of arms 45a, 45b, 46a, 46b can sandwich the first protrusions 42d, 42e in the vertical direction Z. Therefore, the first protrusions 42d, 42e can be hooked to each pair of arms 45a, 45b, 46a, 46b in the vertical direction Z. This can suitably suppress the elastic bush 42 from moving relative to the holder 41 in the vertical direction Z.

[0098] According to the present embodiment, the pair of second protrusions 47a, 47b are formed on the pair of vertical frame side portions 41u, respectively, which sandwich the first protrusions 42d, 42e between the locking portions 45c, 46c in the front-rear direction X in the held state. Therefore, the elastic bushing 42 can be more suitably prevented from moving relative to the holder 41 in the front-rear direction X.

[0099] According to this embodiment, the outer peripheral edge of the elastic plate portion 42a is located outside the first elastic frame portion 42b when viewed in the front-rear direction X. The elastic bushing 42 has a square frame-shaped second elastic frame portion 42c that protrudes rearward (-X side) from the outer peripheral edge of the elastic plate portion 42a and surrounds the first elastic frame portion 42b. The flange portion 41c has a square frame shape that surrounds the holder main body portion 41t, and is inserted into a square frame-shaped second groove portion 42f formed between the first elastic frame portion 42b and the second elastic frame portion 42c. This allows the elastic bushing 42 to be held more stably by the holder 41.

[0100] According to the present embodiment, the claws 43, 44 are formed on a pair of horizontal frame side portions 41v of the holder main body portion 41t that are arranged to face each other in the up-down direction Z that is perpendicular to both the front-rear direction X and the left-right direction Y, and are elastically deformable in the up-down direction Z. Therefore, the pair of claws 43, 44 can more suitably prevent the holder 41 from coming off the through hole 31c. Furthermore, by providing the claws 43, 44 on a pair of horizontal frame side portions 41v different from the pair of vertical frame side portions 41u on which the pair of holding portions 45, 46 are formed, the force received when the elastic bush 42 is pulled is easily distributed and received in a suitable manner in the circumferential direction around the center line C. This makes it possible to more suitably prevent the bush part 40 from coming off the through hole 31c. Furthermore, since the pair of claws 43, 44 are elastically deformable in the up-down direction Z, as described above, the pair of claws 43, 44 can be elastically deformed and passed through the through hole 31c simply by inserting the holder 41 into the through hole 31c. This allows the pair of claws 43, 44 to be easily hooked onto the periphery of the through hole 31c from the rear side, thus facilitating the work of attaching the bush component 40 to the through hole 31c.

[0101] Moreover, according to this embodiment, the elastic bushing 42 is made of rubber, and the holder 41 is made of resin. Therefore, the elastic bushing 42 can be elastically deformed relatively easily, and the inner edge of the wiring hole 42g formed in the elastic bushing 42 can be easily brought into close contact with the wiring 70. This makes it easy to suitably seal the gap between the inner edge of the wiring hole 42g and the wiring 70. Also, the rigidity of the holder 41 can be made larger than the rigidity of the elastic bushing 42, and the elastic bushing 42 can be more suitably held by the holder 41.

[0102] Furthermore, according to this embodiment, since the bush component 40 is provided in the refrigerant distribution device 30, the wiring 70 connected to the control unit 32 of the refrigerant distribution device 30 can be passed through the bush component 40 and drawn to the outside of the case 31, while the bush component 40 can prevent foreign matter such as water from entering the case 31. Furthermore, as described above, this embodiment can prevent the bush component 40 from coming off, so that the bush component 40 can be prevented from coming off during the installation work of the refrigerant distribution device 30, etc. This makes it easier to install the refrigerant distribution device 30.

[0103] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the configurations of the above-described embodiments, and the following configurations and methods may also be adopted.

[0104] The pair of holding portions in the holder may have any configuration as long as they have a locking portion. The holder main body may not be formed with a first groove portion. The flange portion and the claw portion in the holder may each have any shape. The flange portion does not have to be frame-shaped, and a plurality of flange portions may be provided at positions spaced apart from each other. Only one claw portion may be provided, or three or more claw portions may be provided. The flange portion and the claw portion may be disposed at positions not overlapping each other in the first direction (front-rear direction X). The material constituting the holder is not particularly limited. The holder may be made of metal.

[0105] The elastic bushing may have a circular plate shape or the like as long as the first elastic frame part is a square frame shape. The elastic bushing may not have a second elastic frame part. The number of wiring holes formed in the elastic plate part is not particularly limited. Five or more wiring holes may be formed in the elastic plate part. The material constituting the elastic bushing is not particularly limited as long as it is an elastic body.

[0106] The bush part of the present disclosure may be provided in any type of equipment, and may be provided in equipment other than a refrigerant distribution device. A refrigerant distribution device including the bush part of the present disclosure may be installed in any location. The refrigerant distribution device may be installed on the floor of a room, or may be installed while hanging on a wall. The number of indoor units that can be connected to the refrigerant distribution device is not particularly limited as long as it is two or more. The entire first refrigerant piping or the entire second refrigerant piping may be housed inside the case of the refrigerant distribution device.

[0107] The configurations and methods described in this specification can be combined as appropriate within the scope of not being mutually inconsistent. [Explanation of symbols]

[0108] 10... outdoor unit, 11a, 11b, 21a, 21b... refrigerant piping, 20... indoor unit, 30... refrigerant distribution device, 31... case, 31a... mounting wall portion, 31c... through hole, 40... bush part, 41... holder, 41b... outer wall portion, 41c... flange portion, 41p... first groove portion, 41t... holder main body portion, 41u... vertical frame side portion (first frame side portion), 41v... horizontal frame side portion (third frame side portion), 42... elastic bush, 42a... elastic plate portion, 42b... first elastic frame portion, 42c... second elastic frame portion, 42d, 42e... first protrusion portion, 42f... second groove portion, 42 g... wiring hole, 42h... vertical frame side portion (second frame side portion), 43, 44... claw portion, 45, 46... holding portion, 45a, 45b, 46a, 46b... arm portion, 45c, 46c... locking portion, 45d, 46d... hinge portion, 45e, 45f, 46e, 46f... engagement protrusion, 47a, 47b... second protrusion portion, 48a, 48b... opening, 61, 61a, 61b... first refrigerant pipe, 62, 62a, 62b... second refrigerant pipe, 70... wiring, 100... air conditioner, X... front-rear direction (first direction), Y... left-right direction (second direction), Z... up-down direction (third direction)

Claims

1. A bush component to be attached to a rectangular through hole that penetrates a mounting wall portion in a first direction, An elastic bush made of an elastic body; A holder for holding the elastic bushing; Equipped with The holder includes: A rectangular frame-shaped holder main body that is inserted into the through hole; a flange portion protruding from the holder body portion and hooked onto a peripheral portion of the through hole from a first side in the first direction; a claw portion protruding from the holder body portion and hooked onto a peripheral portion of the through hole from a second side opposite to the first side in the first direction; A pair of holding parts connected to an inner edge of the holder main body part via a hinge part; having The holder body has a rectangular frame-shaped outer wall, The elastic bushing is an elastic plate portion covering the through hole from the first side; a first elastic frame portion having a rectangular frame shape that protrudes from the elastic plate portion to the second side and is inserted into the inside of the outer wall portion; A pair of first protrusions formed on an inner surface of the first elastic frame portion; having a wiring hole through which a wiring passing through the through hole is passed can be formed in a portion of the elastic plate portion that is located inside the first elastic frame portion when viewed in the first direction, the pair of holding portions are connected to a pair of first frame side portions of the holder main body that are arranged to face each other in a second direction perpendicular to the first direction, the pair of first protrusions are formed on a pair of second frame side portions of the first elastic frame portion that are arranged opposite to each other in the second direction, and are arranged away from the elastic plate portion on the second side, A bush component, wherein each of the pair of retaining portions has a locking portion that can be positioned between the first protrusion portion and the elastic plate portion when the pair of retaining portions is in a retained state in which the pair of retaining portions is bent to the first side via the hinge portion.

2. The bush component according to claim 1 , wherein the holder body portion has a first groove portion into which the first elastic frame portion is inserted.

3. A pair of openings are formed in the pair of first frame side portions, the openings connecting an interior of the holder main body portion to an interior of the first groove portion, The bush component according to claim 2 , wherein each of the pair of holding portions has an engagement protrusion that is hooked onto an edge of the opening from inside the first groove portion in the held state.

4. The bush component according to claim 1 , wherein each of the pair of holding portions has an engagement projection that is hooked onto the holder body portion in the held state.

5. each of the pair of holding portions has a pair of arms connected to the holder body portion via the hinge portion; The bush component according to claim 1 , wherein the locking portion connects the tip ends of the pair of arms together.

6. The bush component according to claim 1 , wherein a pair of second protrusions are formed on the pair of first frame side portions, the second protrusions sandwiching the first protrusion between the engaging portion and the engaging portion in the first direction in the held state.

7. When viewed in the first direction, an outer circumferential edge portion of the elastic plate portion is located outside the first elastic frame portion, the elastic bushing has a second elastic frame portion having a rectangular frame shape that protrudes from an outer circumferential edge portion of the elastic plate portion to the second side and surrounds the first elastic frame portion, The bush component according to claim 1 , wherein the flange portion is a rectangular frame-shaped portion surrounding the holder main body portion and is inserted into a rectangular frame-shaped second groove portion formed between the first elastic frame portion and the second elastic frame portion.

8. The bush part according to claim 1, wherein the claw portions are formed on a pair of third frame side portions of the holder main body portion arranged opposite each other in a third direction perpendicular to both the first direction and the second direction, and are elastically deformable in the third direction.

9. The elastic bushing is made of rubber. The bush component according to claim 1 , wherein the holder is made of resin.

10. A refrigerant distribution device provided in an air conditioner for distributing refrigerant from an outdoor unit to a plurality of indoor units, a first refrigerant pipe to which a refrigerant pipe extending from the outdoor unit is connected; a plurality of second refrigerant pipes connected to the first refrigerant pipe and to which refrigerant pipes extending from the plurality of indoor units are respectively connected; a case having a mounting wall portion having a through hole formed therein and accommodating at least a portion of the first refrigerant pipe and at least a portion of the plurality of second refrigerant pipes therein; A bushing component according to any one of claims 1 to 9 attached to the through hole; A refrigerant distribution device comprising:

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