WO2019087434A1

WO2019087434A1 - Bush, connector, lead storage battery, and electric vehicle

Info

Publication number: WO2019087434A1
Application number: PCT/JP2018/016483
Authority: WO
Inventors: 伊織永留; 聡草野
Original assignee: 日立化成株式会社
Priority date: 2017-11-06
Filing date: 2018-04-23
Publication date: 2019-05-09
Also published as: JPWO2019087434A1; JP6536754B1; CN111295806B; CN111295806A; WO2019087396A1

Abstract

A bush (20) used in a connector having: a protective section (12) covering a contact terminal (4) arranged at one end of a power cable (3); and a draw-in unit (13) that draws the power cable into the protective section. The bush comprises: cylindrical main body sections (21) that extend in one direction, have hollow sections (21a) having the power cable inserted therein, and are inserted into the draw-in unit; annular first ribs (23) formed along the circumferential direction of an inner circumferential surface (22) in the hollow sections and protruding inwards from the inner circumferential surface; and a lid (27) having a hollow section (27a) arranged on one end side of the main body sections in one direction and penetrating the hollow sections (21a), and a flange (27b) that bulges outwards from the outline of the main body sections when viewed in the planar view from one direction. The flange is formed so as to be in contact with a tip (10b) in the draw-in unit when facing one direction, when the main body sections are inserted into the draw-in unit.

Description

Bush, connector, lead storage battery and electric vehicle

One aspect of the present invention relates to a bush used for a connector for connecting power cables, a connector provided with the same, a lead storage battery, and an electric vehicle.

In an electrically powered vehicle driven by power stored in a plurality of storage batteries, the plurality of storage batteries and the power supply controller are electrically connected by a power cable. A connector is provided in the middle of the power supply cable, and the power supply cable extending from the plurality of storage batteries and the power supply cable extending from the power supply controller are connected by the connector. The connector includes a storage battery side connector in which a contact terminal at the tip of a power supply cable extending from a plurality of storage batteries is accommodated by a housing, and a vehicle body side connector in which a contact terminal at a tip of the power cable extends from a power supply controller is accommodated by a housing The plugs of each other are detachably fitted. The contact terminals on the power supply cable side extending from the plurality of storage batteries and the contact terminals on the power supply cable side extending from the power supply controller are mutually conductive (electrically connected) by fitting the connectors to each other (for example, Patent Document 1). Moreover, when connecting a storage battery and a charger, it may be connected via the connector with which a charger is equipped.

JP, 2010-262845, A

The housing of the storage battery side connector and the vehicle body side connector is formed with a pull-in portion at the proximal end opposite to the side where the both connectors are connected to each other in order to pull in the power cable inside the housing. The power supply cable is inserted into the lead-in portion without any gap. However, since the power supply cable is generally flexible, bending the power supply cable creates a gap between the lead-in portion and the power supply cable, which may cause water to enter the housing.

Then, one side of this invention aims at providing a bush, a connector, a lead storage battery, and an electric vehicle which can improve waterproofness in a drawing-in part of a power cable.

A bush according to one aspect of the present invention is a bush used for a connector having a protection portion covering contact terminals disposed at one end of a power cable and a lead-in portion for pulling the power cable into the protection portion. Along the circumferential direction of the inner peripheral surface forming the first insertion hole and the cylindrical main body portion having the first insertion hole into which the power supply cable is inserted and extending in one direction. And an annular first protrusion projecting inward from the inner circumferential surface, a second insertion hole disposed on one end side of the main body in one direction and communicating with the first insertion hole, one direction And a lid portion having a ridge portion projecting outward from the outer shape of the main body portion in plan view, and the ridge portion and the tip end of the lead-in portion when the main body portion is inserted into the lead-in portion It is formed to be in contact in a state facing one direction

The main body portion of the bush of this configuration is formed insertably into the lead-in portion for drawing the power supply cable into the protective portion covering the contact terminal disposed at one end of the power supply cable in the connector, and the first protrusion is the main body The outer peripheral surface of the power supply cable inserted in the part is formed so as to be contactable. According to the bush of this configuration, the outer peripheral surface of the power supply cable is disposed in contact with the first projecting portion formed on the inner peripheral surface of the main body portion. Thereby, even if the power supply cable is bent, the contact between the first protrusion projecting from the inner peripheral surface of the main body and the outer peripheral surface of the power supply cable can be maintained. Furthermore, since the bush of this configuration is provided with a lid portion having a collar portion that is formed to be in contact with the tip end of the lead-in portion in one direction when the main body portion is inserted into the lead-in portion. The buttocks cover the gap between the lead-in and the main body. This can prevent water from entering the inside of the connector along the gap between the lead-in portion and the main body portion. These synergetic effects can enhance waterproofness in the lead-in portion of the power cable.

In the bush according to one aspect of the present invention, the main body has a first main body into which the cable connected to the positive electrode is inserted, and a second main body into which the cable connected to the negative electrode is inserted; The lid may connect the first main body and the second main body. Thereby, even in the case of inserting the power supply cable for the positive electrode and the power supply cable for the negative electrode into the connector, it is possible to enhance the waterproofness in the lead-in portion of the power supply cable.

In the bush according to one aspect of the present invention, when the lid is viewed in plan from one direction, the lid is formed with a linear portion extending along the direction in which the first main body and the second main body are arranged. It may be done. This allows it to conform to the shape of a flat formed connector to facilitate attachment to a wall.

In the bush according to one aspect of the present invention, the shape of the lid in a plan view seen from one direction is asymmetric in the direction orthogonal to the direction in which the first main body and the second main body are arranged and in one direction. It may be formed as. Thus, for example, when the bush has a hole into which the cable connected to the positive electrode is inserted and a hole into which the cable connected to the negative electrode is inserted, the hole for positive electrode and the hole for negative electrode are It is possible to prevent the connector from being inserted in the state of being mistaken. As a result, defects such as shorts can be avoided.

In the bush according to one aspect of the present invention, the shape of the ridge portion in a plan view seen from one direction may be formed so as to be rotationally symmetric once. Thus, for example, when the bush has a hole into which the cable connected to the positive electrode is inserted and a hole into which the cable connected to the negative electrode is inserted, the hole for positive electrode and the hole for negative electrode are It will not be inserted into the connector in the wrong state. As a result, defects such as shorts can be avoided.

A bush according to one aspect of the present invention is a bush used for a connector having a protection portion covering contact terminals disposed at one end of a power cable and a lead-in portion for pulling the power cable into the protection portion. Along the circumferential direction of the inner peripheral surface forming the first insertion hole and the cylindrical main body portion having the first insertion hole into which the power supply cable is inserted and extending in one direction. And an annular first protrusion projecting inward from the inner circumferential surface, a second insertion hole disposed on one end side of the main body in one direction and communicating with the first insertion hole, one direction A lid portion having a flange portion projecting outward from the outer shape of the main body portion in a plan view as viewed from the bottom, and the main body portion is a first main body portion into which a power cable connected to a positive electrode is inserted; Power supply cable connected to the second body is interpolated When having a lid, a first body portion and a second body portion connected, the shape of the lid portion in the plan view seen from one direction, and is formed such that the one rotational symmetry.

The main body portion of the bush of this configuration is formed insertably into the lead-in portion for drawing the power supply cable into the protective portion covering the contact terminal disposed at one end of the power supply cable in the connector, and the first protrusion is the main body The outer peripheral surface of the power supply cable inserted in the part is formed so as to be contactable. According to the bush of this configuration, the outer peripheral surface of the power supply cable is disposed in contact with the first projecting portion formed on the inner peripheral surface of the main body portion. Thereby, even if the power supply cable is bent, the contact between the first protrusion projecting from the inner peripheral surface of the main body and the outer peripheral surface of the power supply cable can be maintained. As a result, the waterproofness at the lead-in portion of the power cable can be enhanced.

In the bush according to one aspect of the present invention, the outer shape of the lid portion in a plan view seen from one direction may be the same in size and shape as the outer shape of the lead-in portion in a plan view seen from one direction. Thus, the lid can reliably cover the opening, so that water can be prevented from entering the connector through the gap between the lead-in and the main body.

The bush according to one aspect of the present invention may further include an annular second protrusion which is formed along the circumferential direction of the inner peripheral surface forming the second insertion hole and protrudes inward from the inner peripheral surface. Good. Thus, it is possible to provide an annular projecting portion projecting inward from the inner circumferential surface in both the first insertion hole and the second insertion hole, so that water enters the inside of the connector along the power cable. Can be prevented.

In the bush according to one aspect of the present invention, the first protrusion may have flexibility. The bush improves the followability of the first protrusion to the outer peripheral surface of the power cable when the power cable is inserted. Thereby, waterproofness can be improved, improving the insertability of the power supply cable to a main-body part.

In the bush according to one aspect of the present invention, the first protrusion may be disposed closer to the contact terminal than the central position in the extending direction of the main body. In the power cable drawn into the main body, the bending amount on the contact terminal side is smaller than the bending amount on the other end side of the power cable than the central position in the extension direction of the main body. That is, the amount of clearance between the inner peripheral surface of the main body and the outer peripheral surface of the power cable is small. Therefore, the contact between the first projecting portion and the outer peripheral surface of the power supply cable can be more reliably maintained.

In the bush according to one aspect of the present invention, a plurality of first protrusions may be arranged in the extending direction of the main body. This can further enhance the waterproofness.

The bush which concerns on one side of this invention may be provided along the circumferential direction of the outer peripheral surface in a main-body part, and may further be equipped with the cyclic | annular 3rd protrusion part which protrudes toward an outer side from an outer peripheral surface. Thereby, the outer peripheral surface of the main body portion and the inner peripheral surface of the lead-in portion can be in close contact with each other. As a result, waterproofness between the inner peripheral surface of the lead-in portion and the outer peripheral surface of the bush when the bush is inserted into the lead-in portion can be enhanced.

A connector according to one aspect of the present invention is a connector having a protective portion covering a contact terminal disposed at one end of a power cable, a connector having a pull-in portion for pulling the power cable into the protective portion, and the bush described above And the main body portion may be inserted into the lead-in portion.

According to the connector of this configuration, the outer peripheral surface of the power supply cable is disposed in contact with the first projecting portion formed on the inner peripheral surface of the lead-in portion. Thereby, even if the power supply cable is bent, the contact between the first protrusion projecting from the inner peripheral surface of the main body and the outer peripheral surface of the power supply cable can be maintained. As a result, the waterproofness at the lead-in portion of the power cable can be enhanced.

In the connector according to one aspect of the present invention, the outer peripheral surface of the main body portion in the bush and the inner peripheral surface of the lead-in portion may be bonded by an adhesive. Thereby, since the outer peripheral surface of the main body and the inner peripheral surface of the lead-in can be fixed, it is possible to more reliably prevent the entry of water from between the main body and the lead-in.

In the connector according to one aspect of the present invention, a flat surface may be formed on a part of the outer peripheral surface of the protection portion and the lead-in portion. This facilitates mounting on a wall surface or the like.

A lead storage battery according to one aspect of the present invention includes at least one lead storage battery, a power supply cable electrically connected to the lead storage battery, and the above connector, and the power supply cable is inserted into the lead-in portion of the connector It may be done.

According to the lead storage battery of this configuration, the outer peripheral surface of the power supply cable is disposed in contact with the first projecting portion formed on the inner peripheral surface of the lead-in portion. Thereby, even if the power supply cable is bent, the contact between the first protrusion projecting from the inner peripheral surface of the main body and the outer peripheral surface of the power supply cable can be maintained. As a result, the waterproofness at the lead-in portion of the power cable can be enhanced.

The electric vehicle according to one aspect of the present invention may include the above-described lead storage battery, and the connector may be attached with the second insertion hole in the buttocks facing upward. In the connector mounted in such a state, water is likely to infiltrate from the bush. However, the bush is provided with the first projecting portion and the buttocks, so that water hardly penetrates.

In the electric vehicle according to one aspect of the present invention, the power supply cable inserted into the second insertion hole may extend upward in the vertical direction and may have a curved portion. In the connector mounted in such a state, water easily penetrates along the power cable. Furthermore, since the power supply cable is disposed in a bent state, a gap is easily formed between the inner peripheral surface of the first insertion hole of the main body and the outer peripheral surface of the power supply cable. However, the bush is provided with the first projecting portion and the buttocks, so that water hardly penetrates.

In the electric vehicle according to one aspect of the present invention, the connector may be attached in an exposed state outside the vehicle body of the electric vehicle. The connector attached in such a state is susceptible to water intrusion. However, the bush is provided with the first projecting portion and the buttocks, so that water hardly penetrates.

According to one aspect of the present invention, waterproofness at the lead-in portion of the power cable can be enhanced.

FIG. 1 is a perspective view of a connector with a bush attached in one embodiment. FIG. 2 is a perspective view of the bush. 3 (A) is a cross-sectional view of the bush of FIG. 2, and FIG. 3 (B) is a side view of the bush of FIG. 4 (A) is a front view of the bush of FIG. 2 as viewed from one direction, and FIG. 4 (B) is a rear view of the bush of FIG. 2 as viewed from the other direction. FIG. 5 is a side view of a forklift mounted with a bush mounted connector of an embodiment. FIG. 6 is an explanatory view for explaining an experimental example. FIG. 7 is a cross-sectional view of a bush according to a first modification. FIG. 8 is a perspective view of a connector to which a bush according to a second modification is attached. FIG. 8 is a perspective view of a bush according to a second modification. 10 (A) is a cross-sectional view of the bush of FIG. 9, and FIG. 10 (B) is a side view of the bush of FIG.

Hereinafter, referring to the drawings, a bush 20 according to an embodiment, a first connector (connector) 10 of an embodiment to which the bush 20 is attached, and a lead storage battery 1 of an embodiment equipped with the first connector 10 Will be explained. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. For convenience of explanation, the extension direction of the power supply cable 3 is orthogonal to the X axis and the X axis, and the arrangement direction of the power supply cable 3 is orthogonal to the Y axis, the X axis and the Y axis, and the first connector 10 The height direction of the second connector 50 is set as the Z axis.

The bush 20 according to one embodiment, the first connector 10 of one embodiment to which the bush 20 is attached, and the lead-acid battery 1 of one embodiment equipped with the first connector 10 are driven by, for example, electrical energy. It is mounted on an electric vehicle such as a forklift (see FIG. 5).

As shown in FIG. 1, the lead-acid battery 1, the power supply controller 6 and the like are accommodated in the electric vehicle. The power supply controller 6 controls the supply of electrical energy from the lead storage battery 1 to the driving electric motor and the like. The lead storage battery 1 and the power supply controller 6 are electrically connected by connecting a power supply cable 3 connected to the lead storage battery 1 and a power supply cable 7 connected to the power supply controller 6.

The power supply cable 3 extending from the lead storage battery 1 is provided with a first connector 10 in which the contact terminal 4 at the tip thereof is accommodated by the housing 11. The power supply cable 7 extending from the power supply controller 6 is provided with a second connector 50 in which the contact terminal 8 at the tip is accommodated by the housing 51. The first connector 10 and the second connector 50 are provided so as to be attachable to and detachable from each other. By fitting the first connector 10 and the second connector 50 to each other, the contact terminal 4 on the side of the power cable 3 extending from the lead storage battery 1 and the contact terminal 8 on the side of the power cable 7 extending from the power controller 6 mutually Conducted (electrically connected).

It is preferable that the cable which is excellent in conductivity is used for the power supply cable 3, and the example of the electrical resistance is 0.4 mΩ or less at 200 mm. Similarly to the power supply cable 3, a member having excellent conductivity is preferably used as the contact terminal 4 provided at the end of the power supply cable 3, and an example of the electric resistance thereof is 0.4 mΩ or less at 200 mm. Examples of the cable having excellent conductivity include rubber-based cabtire cables such as PNCT, CT, WNCT, WRNCT and the like.

An example of the size in the width direction (Y-axis direction) orthogonal to the extension direction (X-axis direction) of the power cable 3 in the first connector 10 is 50 mm to 100 mm, and the extension direction of the power cable 3 (X-axis direction) An example of the size of is 50 mm to 200 mm, and an example of the size of the width direction and the height direction (Z-axis direction) orthogonal to the extension direction of the power cable 3 is 20 mm to 70 mm.

The first connector 10 is preferably formed of a material that is excellent in acid resistance, heat resistance, and insulation. For example, it is preferable that the first connector 10 has an acid resistance so as not to be attacked by sulfuric acid having a specific gravity of 1.120 to 1.800 (at 20 ° C.). Moreover, it is preferable that the first connector 10 has heat resistance that does not melt at 100 ° C. or higher. Further, the first connector 10 preferably has an insulation property of 1000 MΩ or more, and more preferably 500 MΩ or more. Examples of preferred materials for forming the first connector 10 include resins such as PE (polyethylene), PP (polypropylene), PC (polycarbonate), PBT (polybutylene terephthalate) and the like.

The first connector 10 includes a housing 11 having a protective portion 12 covering the contact terminal 4 disposed at one end of the power cable 3 and a lead-in portion 13 for pulling the power cable 3 into the protective portion 12.

The protective portion 12 has a housing portion 12 a for housing the contact terminal 4 and a part of the power supply cable 3. The protective portion 12 is provided with a spring piece (not shown) for supporting the contact terminal 4. It is preferable that a member excellent in conductivity be used for the spring piece, and an example of the electric resistance is 0.4 mΩ or less at 200 mm. Examples of materials that form the spring pieces include stainless steel, copper, silver, or an alloy containing these. Moreover, based on these materials, plating processing, such as silver, may be made, for example. The protective portion 12 is formed to be engageable with the protective portion 52 of the second connector 50. A flat surface 13 e is formed on a part of the outer

circumferential surfaces

12 d and 13 d of the protective portion 12 and the lead-in portion 13.

The lead-in portion 13 has an inner circumferential surface 13 b forming an inner space 13 a into which the power supply cable 3 is inserted along the extending direction of the power supply cable 3. In the present embodiment, the power supply cable 3 is inserted into the lead-in portion 13 via the bush 20. The two lead-in portions 13 are arranged in the direction intersecting the extending direction of the power supply cable 3. In other words, the first connector 10 is formed with a set of lead-in portions 13. The bush 20 is attached to the lead-in portion 13 as shown in FIG.

The bush 20 is preferably formed of a material that is excellent in heat resistance, insulation, elasticity, and flexibility. For example, the bush 20 preferably has such heat resistance that it does not melt at 100 ° C. or higher. Moreover, it is preferable that the bush 20 has insulation whose surface resistance is 1000 M (ohm) or more. Examples of preferable materials for forming the bush 20 include HNBR (hydrogenated nitrile rubber), FKM (fluorinated rubber), VMQ (silicon rubber), ACM (acrylic rubber), CO (epichlorohydrin rubber) and the like.

As shown in FIG. 2, FIG. 3 (A), FIG. 3 (B), FIG. 4 (A) and FIG. 4 (B), the bush 20 is provided with a main body 21 and a lid 27. It is done. One main body portion 21 has an annular first rib (first projecting portion) 23 and an annular third rib (third projecting portion).

The main body portion 21 is a cylindrical member extending in the X-axis direction (one direction) in which the power supply cable 3 extends, and inserted into the lead-in portion 13 of the first connector 10 while the power supply cable 3 is inserted. . Two main body portions 21 are provided in the Y-axis direction orthogonal to the X-axis direction in which the power supply cable 3 extends. In other words, the bush 20 is provided with a pair of main body portions (first main body portion and second main body portion) 21, 21. The power cable 3 connected to the positive electrode is inserted into one of the pair of

body parts

21 and 21, and the power cable 3 connected to the negative electrode is inserted into the other of the pair of

body parts

21 and 21. Be Each of the pair of main body portions 21 has an inner circumferential surface 22 forming an inner space (first insertion hole) 21 a into which the power supply cable 3 is inserted along the extending direction. The diameter of the inner space portion 21a (the diameter of the inner space of the main body portion 21) is formed to be the same as the diameter of the power supply cable 3, and an example thereof is 14.0 mm to 21.5 mm.

The annular first rib 23 is formed along the circumferential direction of the inner peripheral surface 22 of the main body portion 21 and protrudes inward from the inner peripheral surface 22. The first rib 23 is flexible. Five first ribs 23 are arranged in the extending direction of the main body 21. The number of arrangement of the first ribs 23 may be four or less, or six or more. Further, the width (length in the X-axis direction) of the first rib 23 is, for example, 0.5 mm to 6.0 mm, and the amount of protrusion from the inner circumferential surface 22 is, for example, 0.5 mm to 3.5 mm It is.

The annular third rib 26 is formed along the circumferential direction of the outer peripheral surface 25 of the main body portion 21 and protrudes outward from the outer peripheral surface 25. The third rib 26 is flexible. Three third ribs 26 are arranged in the extending direction of the main body 21 (plural). The number of arrangement of the third ribs 26 may be two or less, or four or more. The width (length in the X-axis direction) of the third rib 26 is, for example, 0.5 mm to 4.0 mm, and the amount of protrusion from the outer peripheral surface 25 is, for example, 0.5 mm to 2.5 mm. is there.

The lid portion 27 is a flat member connecting the pair of

main body portions

21 and 21. The lid 27 is disposed at one end of the main body 21 in the X-axis direction (one direction). The outer shape of the lid portion 27 in a plan view as viewed from the X-axis direction matches the outer shape and the shape of the lead-in portion 13 in a plan view as viewed from the X-axis direction. The area of the lid portion 27 in plan view as viewed from the X-axis direction is larger than the area of the opening 13 c of the lead-in portion 13 in plan view as viewed from the X-axis direction. Further, when the lid portion 27 is viewed in plan from the X-axis direction, the lid portion 27 is formed with

linear portions

27e, 27e extending along the direction in which the pair of

main body portions

21, 21 are arranged. .

The lid portion 27 has an inner circumferential surface 28 forming an inner space portion (second insertion hole) 27a for inserting the power supply cable 3 along the extending direction, and the main body portion 21 in a plan view seen from the X axis direction. And an annular second rib (second projecting portion) 29. As shown in FIG. The inner space 27a communicates with the inner space 21a. The diameter of the inner space 27a (the diameter of the inner space of the lid 27) is formed to be the same as the diameter of the power cable 3, and an example thereof is 14.0 mm to 21.5 mm.

As shown in FIG. 4A, the flange portion 27b does not overlap in plan view with the

main body portions

21 and 21 when viewed from the direction (X-axis direction) orthogonal to the lid portion 27. An example of the thickness (size in the X direction) of the lid 27 is 0.5 mm to 15 mm. The collar portion 27 b is formed so as to be in contact with the tip 10 b of the lead-in portion 13 in a state of facing the X-axis direction (one direction) when the main body portion 21 is inserted into the lead-in portion 13.

The annular second rib 29 is formed along the circumferential direction of the inner peripheral surface 28 of the lid 27 and protrudes inward from the inner peripheral surface 28. The second rib 29 is flexible. One second rib 29 is disposed in the extending direction of the lid 27. In addition, two or more second ribs 29 may be arranged. Also, the width (length in the X-axis direction) of the second rib 29 is, for example, 0.5 mm to 6.0 mm, and the amount of protrusion from the inner circumferential surface 28 is, for example, 0.5 mm to 3.5 mm It is.

When the bush 20 is attached to the first connector 10, the two

main body portions

21, 21 of the bush 20 are inserted into the inner space 13 a of the lead-in portion 13 of the first connector 10. Then, by pushing the first surface 27 d on the main body 21 side of the lid portion 27 of the bush 20 into contact with the end 10 b (see FIG. 1) of the first connector 10, the bush to the first connector 10 20 installation is complete.

When the first connector 10 to which the bush 20 is attached is attached to the lead storage battery 1, the power supply cable 3 is inserted from the second surface 27c side opposite to the first surface 27d of the lid 27 The insertion is continued until the contact terminal 4 at the third end reaches the protective portion 12. Then, the contact terminal 4 reaching the protective portion 12 is supported by the protective portion 12 by a spring piece (not shown). Thereby, the lead storage battery 1 equipped with the first connector 10 to which the bush 20 is attached is completed.

The second connector 50 formed to be insertable into and removable from the first connector 10 may also have the same configuration as the first connector 10. To the second connector 50, a bush 20A having the same configuration as the bush 20 attached to the first connector 10 may be attached. As shown in FIG. 1, the second connector 50 includes a protective portion 52 covering the contact terminal 8 disposed at one end of the power cable 7, and a lead-in portion 53 for pulling the power cable 7 into the protective portion 52. And a housing 51 having the The protection unit 52 includes a housing 52 a for housing the contact terminal 8 and a part of the power cable 7. The protective portion 52 is provided with a spring piece (not shown) for supporting the contact terminal 8. The protective portion 52 is formed to be engageable with the protective portion 12 of the first connector 10.

The lead-in portion 53 has an inner space portion 53 a into which the power supply cable 7 is inserted along the extending direction of the power supply cable 7. In the present embodiment, the power supply cable 7 is inserted into the lead-in portion 53 via the bush 20A. The two lead-in portions 53 are arranged in the direction intersecting the extending direction of the power supply cable 7. In other words, the second connector 50 is formed with a set of lead-in portions 53. The bush 20A is attached to the lead-in portion 53.

In addition, since the size of the second connector 50 is substantially the same as that of the first connector 10, the description thereof is omitted here. Moreover, since the example of the material which forms the 2nd connector 50 is the same as that of the 1st connector 10, detailed description here is abbreviate | omitted. As shown in FIG. 2, FIG. 3 (A), FIG. 3 (B), FIG. 4 (A) and FIG. 4 (B), the bush 20A attached to the second connector 50 also includes the main body 21 and the lid. A section 27 is provided. The first main body portion 21 is the same as the configuration having the annular first rib (first projecting portion) 23 and the annular third rib (third projecting portion), and is adapted to the size of the second connector 50 It has been resized. Moreover, since the example of the material which forms the bush 20A is the same as that of the bush 20, detailed description here is abbreviate | omitted.

As described above, the bush 20 according to one embodiment, the first connector 10 of one embodiment to which the bush 20 is attached, and the lead storage battery 1 of one embodiment equipped with the first connector 10 are, for example, illustrated in FIG. It is mounted on a forklift 100 as shown in FIG. In the forklift 100, the operator can drive the wheels 102 by stepping on the accelerator pedal 101 to run the forklift 100. By operating the lift lever 103, the hydraulic cylinder 104 is extended and retracted to raise or lower the fork 105. It can be done.

Below the seat 106 of the forklift 100, a battery room 107 for accommodating the lead storage battery 1 is provided. The battery room 107 is disposed at the top of the chassis 108 that supports the wheels 102. Inside the chassis 108, a power source controller 6 and a motor 109 for driving the wheels 102 are accommodated. The lead storage battery 1 and the power supply controller 6 are electrically connected by connecting a power supply cable 3 connected to the lead storage battery 1 and a power supply cable 7 connected to the power supply controller 6.

The first connector 10 is attached with the inner space 27a of the flange 27b facing upward. Further, the lead storage battery 1 is provided vertically above the first connector 10, and the power supply cable 3 has a curved portion. The power supply cable 3 inserted into the inner space 27a of the lid 27 extends upward in the vertical direction and has a curved portion. The first connector 10 is attached in a state exposed to the outside of the vehicle body of the forklift 100.

Next, the effect of the 1st connector 10 of one embodiment with which bush 20 concerning one embodiment was attached is explained. As shown in FIG. 1, the main body portion 21 of the bush 20 of the above embodiment has the power cable 3 connected to the protective portion 12 covering the contact terminal 4 disposed at one end of the power cable 3 in the first connector 10. The first rib 23 is formed so as to be insertable into the lead-in portion 13, and as shown in FIG. 3A, the first rib 23 is formed so as to be in contact with the outer peripheral surface 3a of the power cable 3 inserted into the main body portion 21 There is. Therefore, the outer peripheral surface 3 a of the power supply cable 3 is disposed in contact with the first rib 23 formed on the inner peripheral surface 22 of the main body 21. Thereby, even if the power supply cable 3 is bent, the contact between the first rib 23 projecting from the inner peripheral surface 22 of the main body 21 and the outer peripheral surface 3 a of the power supply cable 3 can be maintained.

Furthermore, as shown in FIG. 1 and FIG. 2, the bush 20 of the above embodiment faces the tip 10 b of the lead-in portion 13 in the X-axis direction when the main body portion 21 is inserted into the lead-in portion 13. Since the lid portion 27 having the collar portion 27b formed so as to be in contact with each other, the collar portion 27b covers the gap between the lead-in portion 13 and the main body portion 21. Thereby, water can be prevented from entering the inside of the first connector 10 along the gap between the lead-in portion 13 and the main body portion 21. By these synergetic effects, waterproofness in the lead-in portion 13 of the power cable 3 can be enhanced. Further, since the lid portion 27 is in contact with the tip end 10b of the lead-in portion 13 by the collar portion 27b, it is possible to avoid a defect that the lid portion 27 gets into the interior of the lead-in portion 13 by vibration. That is, it becomes possible to apply to the vehicle etc. which a vibration generate | occur | produces.

Moreover, in the bush 20 of one embodiment, the dimensional shape of the lid portion 27 in a plan view as viewed from the X-axis direction matches the dimensional shape of the lead-in portion 13 in a planar view as viewed from the X-axis direction. As a result, the lid portion can reliably cover the opening portion 13c, so that water can be prevented from entering the inside of the first connector 10 along the gap between the lead-in portion 13 and the main body portion 21. .

Moreover, in the first connector 10 of one embodiment to which the bush 20 of one embodiment is attached, even if the power cable 3 is bent, the first rib 23 and the power cable which protrude from the inner peripheral surface 22 of the main body 21 By being able to maintain the contact with the outer peripheral surface 3a of 3, it is excellent in not only waterproofness but also dust resistance and safety.

The bush 20 according to one embodiment further includes an annular second rib 29 which is formed along the circumferential direction of the inner peripheral surface 28 of the inner space 27a of the lid 27 and protrudes inward from the inner peripheral surface 28. ing. Annular ribs (first rib 23 and second rib 29) projecting inward from the inner

peripheral surfaces

22 and 28 are formed on both the inner peripheral surface 22 of the main body 21 and the inner peripheral surface 28 of the lid 27. Since it can be provided, water can be prevented from entering the interior of the first connector 10 along the power cable 3.

In the bush 20 of one embodiment, since the first rib 23 has flexibility, the followability of the first rib 23 to the outer peripheral surface 3 a of the power cable 3 when the power cable 3 is inserted is improved. Thereby, waterproofness can be improved, improving the insertability of the power supply cable 3 to the main-body part 21. As shown in FIG.

In the bush 20 of one embodiment, the main body portion 21 connects the main body portion 21 into which the power supply cable 3 connected to the positive electrode is inserted and the main body portion 21 into which the power supply cable 3 connected to the negative electrode is inserted. The part 27 is formed. Thereby, even in the case of inserting the power supply cable 3 for the positive electrode and the power supply cable 3 for the negative electrode into the first connector 10, the waterproofness at the lead-in portion 13 of the power supply cable 3 can be enhanced.

In the bush 20 of one embodiment, when the lid portion 27 is viewed in plan from the X-axis direction, the lid portion 27 is a linear portion extending along the direction (Y-axis direction) in which the main body portions 21 are arranged. 27e, 27e are formed. Thereby, in order to make easy the attachment to the wall surface 107a (refer FIG. 5) of the forklift 100, it can match with the shape of the 1st connector 10 in which the flat surface 13e was formed.

In the bush 20 of one embodiment, five first ribs 23 are arranged in the extending direction (X-axis direction) of the main body portion 21. Therefore, compared with the case where one first rib 23 is arranged, the first rib 23 is more waterproof. Can be enhanced.

The bush 20 of one embodiment is formed along the circumferential direction of the outer peripheral surface 25 of the main body portion 21 and further includes an annular third rib 26 projecting outward from the outer peripheral surface 25. Thereby, the outer peripheral surface 25 of the main body 21 and the inner peripheral surface 13 b of the lead-in portion 13 can be in close contact with each other. As a result, waterproofness between the lead-in portion 13 and the bush 20 when the bush 20 is inserted into the lead-in portion 13 can be enhanced.

In the bush 20 of one embodiment, three third ribs 26 are arranged in the extending direction (X-axis direction) of the main body portion 21. Therefore, the third ribs 26 are more waterproof than when one third rib 26 is arranged. Can be enhanced.

In the first connector 10 of the embodiment, the flat surface 13e is formed on a part of the outer circumferential surface 13d of the protection portion 12 and the lead-in portion 13, so that the forklift 100 can be easily attached to the wall surface 107a or the like.

As shown in FIG. 5, the forklift 100 according to one embodiment includes the above-described lead-acid battery 1, and the first connector 10 is attached with the inner space 27 a of the collar 27 b facing upward. In the first connector 10 attached in such a state, water easily penetrates from the bush 20. However, since the first rib 23 and the collar portion 27b are provided in the bush 20, the water hardly invades.

In the forklift 100 according to one embodiment, the power supply cable 3 inserted into the inner space 27a extends upward in the vertical direction and has a curved portion. In the first connector 10 attached in such a state, water easily penetrates along the power cable 3. Furthermore, since the power supply cable 3 is disposed in a bent state, a gap is easily formed between the inner peripheral surface 22 of the inner space 21 a of the main body 21 and the outer peripheral surface 3 a of the power supply cable 3. However, since the bush 20 is provided with the first rib 23 and the flange portion 27b, water hardly penetrates.

In the forklift 100 of one embodiment, the first connector 10 is attached in a state of being exposed to the outside of the vehicle body of the forklift 100. In the first connector 10 attached in such a state, water easily intrudes. However, since the bush 20 is provided with the first rib 23 and the flange portion 27b, water hardly penetrates.

<Example>
Next, the point which the 1st connector 10 which attached the bush 20 of this embodiment is excellent in waterproofness, dust resistance, and safety is demonstrated using FIG. In particular, by configuring the bush 20 according to the above-described embodiment with the attributes shown below, the following points can be satisfied with respect to the point that the "JIS C 0920: 2003 Protection grade by outer shell of electric machine instrument (IP23)" can be satisfied. Conducted the test. Note that this embodiment is not limited to the attributes shown in the example.

(1) Power cable type: WNCT 50SQ manufactured by Fuji Electric Wire Co., Ltd., diameter: 15.7 mm
(2) Bushing Material: Ethylene propylene rubber (EPDM) (Hardness 50)
Inner diameter of the main body into which the power cable is inserted: 18.0 mm, outer diameter of the main body: 29.2 mm, height of the first rib formed on the main body: 1.0 mm, width of the first rib 2.0 mm , Installation interval of the first rib: 4 mm

First, the first connector 10 (hereinafter, referred to as a test product) to which the same bush 20 as that of the above-described embodiment is attached is prepared and installed on the attachment jig 180 as shown in FIG. Specifically, a first condition for fixing the case 11 vertically so that the bush 20 of the sample is at the upper end, and a second condition for fixing the case 11 at an angle of 10 degrees with respect to the vertical surface The test product was placed on the mounting jig 180 according to. At this time, the power supply cable 3 extending from the bush 20 was bent so as to have a curved radius of 70 mm (R1 = 70 mm, D1 = 70 mm, H1 = 70 mm). During the test, the opening on the side of the contact terminal 4 was sealed by the sealing means.

Tests were conducted on the test products installed under the above first and second conditions in accordance with “JIS C0920: 2003 Protection class by outer shell of electric machine appliance (IP23)”. Specifically, three types of protection tests shown below were conducted. The contents and summary of the three types of protection tests are as follows.

Test 1: Protection of the human body against approaching dangerous places in the shell It is a test of protection against approaching to dangerous places with fingers, and it is a jointed test with a diameter of 12 mm and a length of 80 mm. It is a test of whether or not the appropriate spatial distance is secured between the tip of the finger (proximity inspection probe) and the dangerous place. In the present embodiment, the proximity inspection probe is inserted with a pressing force of 10 N ± 1 N into the gap (opening) between the lead-in portion 13 and the power cable 3 in the bush 20 of the test product.

Test 2: Protection of electrical equipment in outer shell against intrusion of solid from outside This test is to test for protection against foreign solid with a diameter of 12.5 mm or more, and spherical with a diameter of 12.5 mm. It is a test of whether or not the whole solid substance probe penetrates. In this embodiment, a solid substance probe, which is a steel ball with a diameter of 12.5 mm to 12.7 mm, is applied to a gap (opening) between the lead-in portion 13 and the power cable 3 in the bush 20 of the test product. Inserted in

Test 3: Protection of electrical equipment in the shell against the harmful effects of water infiltration It is a test of protection against water spray and it is also harmful by water sprayed at an angle of up to 60 degrees from the vertical. It is a test of whether it is affected or not. In this example, the test was performed using a water spray nozzle (JIS C0920: 2003 attached FIG. 5 IPX3). Specifically, a shield plate with a balance weight is used, the water sprinkling rate is 10 L ± 0.5 L, the water sprinkling angle is ± 60 degrees with respect to the vertical direction, and the water pressure on the inflow side is set by the water sprinkling rate The distance from the nozzle to the outer surface of the sample was 300 mm to 500 mm, and the test time was 1 minute / m ² (minimum 5 minutes).

As a result of conducting the above-mentioned test, in Test 1, there was no penetration of the proximity probe into the inside of the sample. In Test 2, there was no penetration of the solid inspection probe into the inside of the sample. In Test 3, there was no penetration of water into the inside of the sample under both the first and second conditions. Thereby, it turned out that the 1st connector 10 which attached bush 20 of this example is excellent in waterproofness, dust resistance, and safety.

As mentioned above, although one embodiment was described, one side of the present invention is not limited to the above-mentioned embodiment. Various modifications are possible without departing from the scope of the invention.

<Modification 1>
In the above embodiment, a plurality of first ribs 23 are arrayed in the extending direction of the main body portion 21 and formed at equal intervals in the entire extending direction (X-axis direction) of the inner peripheral surface 22 of the main body portion 21 However, for example, a plurality may be disposed only on the side of the contact terminal 4 than the central position in the extending direction of the main body 21 (see FIG. 6), or one may be disposed. In other words, the first rib 23 may not be formed on the side of the lead storage battery 1 with respect to the center position in the extending direction of the main body 21. In the power cable 3 drawn into the main body 21 in such a first connector 10, the bending amount on the contact terminal 4 side with respect to the central position in the extension direction (X-axis direction) of the main body 21 is the other It becomes smaller than the amount of bending of the end side (lead storage battery 1 side) of That is, the amount of clearance between the inner peripheral surface 22 of the main body 21 and the outer peripheral surface 3 a of the power supply cable 3 is small. Therefore, in the bush 20B according to the first modification, the contact between the first rib 23 and the outer peripheral surface 3a of the power supply cable 3 can be more reliably maintained.

<Modification 2>
Next, with reference mainly to FIGS. 8 to 10, a bush 120 according to the second modification and a first connector (connector) 110 according to the second modification to which the bush 120 is attached will be described. The first connector 110 according to the second modification differs from the first connector 10 according to the above embodiment in the shapes of the lead-in portion 113 and the lid 127 as viewed from the X-axis direction. Here, only the shapes of the lead-in portion 113 and the lid portion 127 which are differences from the above embodiment will be described in detail, and the description of the other portions will be omitted.

The shapes of the lead-in portion 113 and the lid portion 127 in plan view as viewed from the X-axis direction are formed so as to be one-time rotational symmetric. One-time rotational symmetry refers to a property that exhibits symmetry that does not overlap (does not coincide with) its own figure only when it is rotated 360 degrees around the center of the figure as an axis of rotation. Further, the shapes of the lead-in portion 113 and the lid portion 127 in a plan view as viewed from the X-axis direction are a direction (Z-axis direction) orthogonal to the direction in which the

main portions

21, 21 are arranged (Y-axis direction) It is formed to be asymmetrical. Specifically, the shapes of the lead-in portion 113 and the lid portion 127 in plan view as viewed from the X-axis direction are different between the linear portion 127 e and the curved portion 127 f.

A flat surface 113 e is formed on part of the outer peripheral surface 113 d of the lead-in portion 113. The first connector 110 is attached such that the flat surface 113 e contacts the wall surface 107 a (see FIG. 5) of the forklift 100. In the outer peripheral surface 113d of the lead-in portion 113, a curved surface 13f is formed on the surface facing the flat surface 113e. The lid portion 127 extends along the direction (Y-axis direction) in which the

main portions

21, 21 are arranged when the lid portion 127 is viewed in plan from the X-axis direction in accordance with the shape of the lead-in portion 113. A straight portion 127e is formed. Further, the lid portion 127 is formed with a curved portion 127 f in the Z-axis direction. As a result, the outer shape of the lid portion 127 in a plan view as viewed from the X-axis direction matches the outer shape of the lead-in portion 113 in a plan view as viewed from the X-axis direction.

Also in the first connector 110 of one embodiment to which the bush 120 according to the modification 2 is attached, as in the bush 120 and the first connector 110 of the above embodiment, even if the power cable 3 is bent, the main body 21 The contact between the first rib 23 protruding from the inner peripheral surface 22 of the second embodiment and the outer peripheral surface 3a of the power supply cable 3 can be maintained, and the gap between the lead-in portion 13 and the main body portion 21 is transmitted to the inside of the first connector 10 Water can be prevented from entering. By these synergetic effects, waterproofness in the lead-in portion 13 of the power cable 3 can be enhanced.

In the bush 120 according to the second modification, the shape of the lid portion 127 in a plan view seen from the X-axis direction is formed so as to be rotationally symmetric once, so the main body portion 21 for positive electrode and the main body for negative electrode In the state in which the part 21 and the part 21 are mistaken, it is not inserted into the drawing-in part 113. As a result, defects such as shorts can be avoided.

In the above-described embodiment and modification, the first rib 23 has been described by way of an example having flexibility, but may not have flexibility. Even in this case, the waterproofness can be enhanced as compared with the case where the first rib 23 is not formed on the inner peripheral surface 22 of the main body portion 21.

Although the said embodiment and modification gave and demonstrated the example which the shape of the outer peripheral surface 25 of the main-body part 21 is circular (cross-sectional circular) seeing from an X-axis direction, it may be a rectangle or it is an ellipse The shape may be a curve or a straight line. Further, the shape of the lid portion 27 is not limited to the above-described embodiment or the example of the modification, and may be circular as viewed from the X-axis direction, or may be elliptical, and includes straight lines and curves. It may be shaped.

Although the said embodiment and modification gave and demonstrated the example in which one set of main-

body parts

21 and 21 is formed in the cover part 27, one or three or more main-body parts are demonstrated with respect to one cover part. You may have.

Although the said embodiment and modification gave and demonstrated the example in which the 3rd rib 26 was formed in the outer peripheral surface 25 of the main-body part 21, the 3rd rib 26 of the outer peripheral surface 25 does not need to be formed. Further, the outer peripheral surface 25 of the main body portion 21 and the inner peripheral surface 13 b of the lead-in portion 13 in the bush 20 may be adhered by an adhesive, or a sheet-like member may be disposed.

Although the said embodiment and modification showed and demonstrated the example which applied this invention to the forklift 100, you may apply this invention to electrically-driven vehicles, such as a golf cart.

DESCRIPTION OF SYMBOLS 1 ... Lead storage battery, 3 ... Power supply cable, 3a ... Outer peripheral surface, 6 ... Power supply controller, 7 ... Power supply cable, 10, 110 ... 1st connector (connector), 10b ... Tip of a lead-in part, 11 ... Housing | casing, 12 ... Protective part, 13: Lead-in part, 13e, 113e: Flat surface, 20, 20A, 20B, 120: Bush, 21: Body part, 22: Inner circumferential surface, 23: First rib (first projecting part), 25: ... Outer peripheral surface, 26: third rib (third projecting portion) 27, 27: lid portion, 27e, 127 e: linear portion, 28: inner peripheral surface, 29: second rib (second projecting portion), 50: second portion Two connectors (connectors), 51: housing, 52: protective part, 53: lead-in part, 100: forklift (electric vehicle).

Claims

A bush used for a connector having a protection portion covering contact terminals disposed at one end of a power supply cable, and a lead-in portion for pulling the power supply cable into the protection portion,
A cylindrical main body extending in one direction and having a first insertion hole into which the power supply cable is inserted, and being inserted into the lead-in portion;
An annular first projecting portion which is formed along the circumferential direction of the inner peripheral surface forming the first insertion hole, and protrudes inward from the inner peripheral surface;
A second insertion hole disposed on one end side of the main body portion in the one direction and in communication with the first insertion hole, and a ridge portion protruding outward from the outer shape of the main body portion in a plan view seen from the one direction And a lid having
The bush is formed to come into contact with the tip of the lead-in portion in a state of being opposed to the one direction when the main body portion is inserted into the lead-in portion.
The main body portion includes a first main body portion into which the power supply cable connected to the positive electrode is inserted, and a second main body portion into which the power supply cable connected to the negative electrode is inserted.
The bush according to claim 1, wherein the lid connects the first main body and the second main body.
When the lid portion is viewed in plan from the one direction, the lid portion is formed with a linear portion extending along a direction in which the first main body portion and the second main body portion are arranged. The bush of item 2.
The shape of the lid in a plan view seen from the one direction is asymmetrical so as to be orthogonal to the direction in which the first main body and the second main body are arranged and the one direction The bush according to claim 2 or 3.
The bush according to claim 2 or 3, wherein a shape of said lid in a plan view seen from said one direction is formed to be a one-time rotational symmetry.
A bush used for a connector having a protection portion covering contact terminals disposed at one end of a power supply cable, and a lead-in portion for pulling the power supply cable into the protection portion,
A cylindrical main body extending in one direction and having a first insertion hole into which the power supply cable is inserted, and being inserted into the lead-in portion;
An annular first projecting portion which is formed along the circumferential direction of the inner peripheral surface forming the first insertion hole, and protrudes inward from the inner peripheral surface;
A second insertion hole disposed on one end side of the main body portion in the one direction and in communication with the first insertion hole, and a ridge portion protruding outward from the outer shape of the main body portion in a plan view seen from the one direction And a lid having
The main body portion includes a first main body portion into which the power supply cable connected to the positive electrode is inserted, and a second main body portion into which the power supply cable connected to the negative electrode is inserted.
The lid connects the first main body and the second main body,
The bush, in which the shape of the lid in a plan view seen from the one direction is rotationally symmetric once.
The outer shape of the lid portion in a plan view as viewed from the one direction has the same shape and shape as the outer shape of the lead-in portion in a plan view as viewed from the one direction. Bush.
The ring according to any one of claims 1 to 7, further comprising: an annular second projecting portion formed along the circumferential direction of the inner peripheral surface forming the second insertion hole, and projecting inward from the inner peripheral surface. The bush described in the paragraph.
The bush according to any one of claims 1 to 8, wherein the first projection is flexible.
The bush according to any one of claims 1 to 9, wherein the first protrusion is disposed closer to the contact terminal than a central position in the extending direction of the main body.
The bush according to any one of claims 1 to 10, wherein a plurality of the first protrusions are arranged in the extending direction of the main body.
The bush according to any one of claims 1 to 11, further comprising an annular third projecting portion formed along the circumferential direction of the outer peripheral surface of the main body portion and projecting outward from the outer peripheral surface.
A connector having the protection part covering the contact terminal disposed at one end of the power supply cable, and the lead-in part drawing the power supply cable into the protection part;
A bush according to any one of claims 1 to 12;
The connector, wherein the body portion is inserted into the lead-in portion.
The connector according to claim 13, wherein an outer peripheral surface of the main body portion and an inner peripheral surface of the lead-in portion in the bush are adhered by an adhesive.
The connector according to claim 13 or 14, wherein a flat surface is formed on a part of the outer circumferential surface of the protective portion and the lead-in portion.
At least one lead storage battery,
The power cable electrically connected to the lead storage battery;
And the connector according to any one of claims 13 to 15.
The lead acid battery, wherein the power cable is inserted into the lead-in portion of the connector.
A lead storage battery according to claim 16;
The electric vehicle is mounted in a state where the second insertion hole in the buttocks is directed upward.
The electric vehicle according to claim 17, wherein the power supply cable inserted into the second insertion hole extends upward in the vertical direction and has a curved portion.
The electric vehicle according to claim 17, wherein the connector is attached in an exposed state to the outside of a vehicle body of the electric vehicle.