WO2017064773A1

WO2017064773A1 - Connection structure and connecting portion protection member

Info

Publication number: WO2017064773A1
Application number: PCT/JP2015/079055
Authority: WO
Inventors: 太一岡
Original assignee: 日立金属株式会社
Priority date: 2015-10-14
Filing date: 2015-10-14
Publication date: 2017-04-20
Also published as: JPWO2017064773A1; JP6753411B2

Abstract

[Problem] To provide a connection structure and a connecting portion protection member allowing the connecting portion to be a touch protection structure. [Solution] This connection structure 100 has a connecting portion 6 wherein a first electrode 3 provided on a terminal support 2 and a second electrode 5 provided at an extremity portion of a cable 4 are fixed by screw-fastening. The connection structure 100 is provided with a connecting portion protection member 1 having: a screw 7 for the screw-fastening; and a housing 8 comprising an insulator, fixed onto the terminal support 2 and installed in such a manner as to cover the connecting portion 6. The housing 8 has a hollow cylindrical guiding portion 10 for the passage of the screw 7. The guiding portion 10 has a screw-maintaining mechanism 13 whereby the screw 7 is maintained inside the guiding portion 10 in a separated state from the first electrode 3 when the fixation by the screw-fastening is released.

Description

Connection structure and connection part protection member

The present invention relates to a connection structure and a connection portion protection member.

Conventionally, when connecting a cable such as a battery or an inverter in an electric vehicle or a hybrid vehicle, for example, a plate-shaped first electrode (bus bar terminal) provided on a terminal block of the device and an end of the cable The plate-like 2nd electrode (bus bar terminal) provided in is electrically connected by screwing fixation (for example, refer to patent documents 1).

JP 2014-969310 A

By the way, there is a possibility that a large current flows in the connection portion between the battery or the inverter and the cable as described above, and there is a risk of electric shock if the operator directly touches the terminal or the like. Depending on the system configuration of the vehicle, the terminal block of the battery or the inverter may be exposed, and in order to ensure the safety of the worker, the structure in which the worker cannot directly touch the connection part, that is, It is desired that the connection portion has a touch protection structure.

Therefore, an object of the present invention is to provide a connection structure and a connection part protection member in which the connection part can have a touch protection structure.

In order to solve the above-mentioned problems, the present invention is a connection structure having a connection portion for screwing and fixing a first electrode provided on a terminal block and a second electrode provided on an end portion of a cable. A connection portion protection member having a screw for screwing and a housing made of an insulator fixed to the terminal block and covering the connection portion, and the housing is a hollow through which the screw passes. A cylindrical guide portion, and the guide portion has a screw holding mechanism that holds the screw in the guide portion in a state of being separated from the first electrode when the screw fixing is released. Provide structure.

In addition, the present invention aims at solving the above-mentioned problems, and is a connection provided at a connection portion for fixing and fixing the first electrode provided on the terminal block and the second electrode provided on the end portion of the cable. And a housing made of an insulator fixed to the terminal block and covering the connecting portion, the housing being a hollow cylinder through which the screw is passed. A connecting portion having a screw holding mechanism for holding the screw in the guide portion in a state of being separated from the first electrode when the screwing and fixing are released. A protective member is provided.

According to the present invention, it is possible to provide a connection structure and a connection part protection member in which the connection part can have a touch protection structure.

It is a perspective view of the connection structure concerning one embodiment of the present invention. It is a top view of the connection structure of FIG. 1A. It is sectional drawing of the connection structure of FIG. 1A. It is a perspective view of a cable. It is a disassembled perspective view of a connection part protection member. It is a perspective view of the housing of a connection part protection member. It is sectional drawing explaining the connection procedure of the connection structure of FIG. 1A. It is sectional drawing explaining the connection procedure of the connection structure of FIG. 1A. It is sectional drawing explaining the connection cancellation | release procedure of the connection structure of FIG. 1A. It is sectional drawing explaining the connection cancellation | release procedure of the connection structure of FIG. 1A.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(Overall structure of connection structure)
1A is a perspective view of a connection structure according to the present embodiment, FIG. 1B is a top view thereof, and FIG. 1C is a sectional view thereof.

As shown in FIGS. 1A to 1C, the connection structure 100 includes a first electrode 3 (bus bar terminal) provided on the terminal block 2, and a second electrode 5 (bus bar terminal) provided on the end of the cable 4. It has the connection part 6 which screw-fixes.

In the connection structure 100 according to the present embodiment, the connection portion 6 is provided with the connection portion protection member 1 for protecting the connection portion 6 and preventing the operator from touching the connection portion 6. The specific structure of the connection part protection member 1 will be described later.

The terminal block 2 is provided in a device such as a battery or an inverter in an electric vehicle or a hybrid vehicle, for example. The terminal block 2 is provided with a first electrode 3. Although not shown in FIGS. 1A to 1C, the first electrode 3 is formed in a plate shape and extends from the housing portion of a device such as a battery to the terminal block 2. 1A to 1C, only the tip of the first electrode 3 is shown.

A screw hole 3 a for screwing a screw 7 for screwing is formed at the tip of the first electrode 3. However, the present invention is not limited thereto, and a through hole through which the screw 7 is passed may be formed in the first electrode 3, and a nut for screwing the screw 7 may be provided in the terminal block 2.

As shown in FIGS. 1 and 2, the cable 4 is configured by covering the outer periphery of a central conductor 4a made of a stranded wire conductor obtained by twisting strands made of a good electric conductor with a sheath 4b made of an insulator. At the distal end portion of the cable 4, the central conductor 4a extends from the sheath 4b, and the second electrode 5 is electrically connected to the extended central conductor 4a.

The second electrode 5 includes a caulking portion 5a that is caulked and fixed to a central conductor 4a that extends from the sheath 4b at the distal end portion of the cable 4, and is formed integrally with the caulking portion 5a and forward (from the cable 4). And a plate-like terminal portion 5b extending in the direction opposite to the extending side. The terminal portion 5b is formed with a through hole 5c through which a screw 7 for screwing is passed.

In the present embodiment, a shrinkable tube (heat-shrinkable tube) 20 made of an insulator is provided so as to cover the outer periphery of the caulking portion 5a of the second electrode 5, and the shrinkage tube 20 allows the caulking portion 5a to work. The person touches. Although details will be described later, the connection portion protection member 1 can be reduced in size by providing the shrinkable tube 20 so as to cover the caulking portion 5a.

The cable 4 is provided with a sealing mechanism 21 having an O-ring 21 a that seals between a cable insertion hole provided in a housing (not shown) of the device and the cable 4. Note that the seal mechanism 21 can be omitted, for example, when it is not necessary to have a waterproof structure or when the terminal block 2 is not provided in the housing and is exposed from the device.

The connecting portion 6 overlaps both

electrodes

3, 5, passes a screw 7 through the through hole 5 c of the second electrode 5, and screws the screw 7 into the screw hole 3 a of the first electrode 3, thereby 5 is fastened and fixed and electrically connected.

(Description of the connection protection member 1)
3 is an exploded perspective view of the connection portion protection member 1, and FIG. 4 is a perspective view of the housing.

As shown in FIGS. 1 to 4, the connecting portion protection member 1 includes a screw 7 for screwing and a housing 8.

The housing 8 is made of an insulator and is provided so as to cover the connection portion 6. The housing 8 is formed in a substantially rectangular parallelepiped shape, and connects the pair of

side walls

8a and 8b arranged opposite to each other and the end portions of the

side walls

8a and 8b (ends opposite to the extension side of the cable 4). The front wall 8c and the upper wall 8d which connects the

side walls

8a and 8b and the upper ends of the front wall 8c are integrally provided. The housing 8 is configured to extend the cable 4 from the base end side (the right side in FIG. 1B), and the base end side and the lower side are open.

The housing 8 is fixed to the terminal block 2. Flange portions 9 for fixing the housing 8 to the terminal block 2 are respectively provided at the lower end portions of the

side walls

8a and 8b so as to protrude sideways. Bolt holes 9a through which bolts for fixing to 2 are passed are formed. A hollow cylindrical collar 9b made of metal is provided at the periphery of the bolt hole 9a to prevent the flange portion 9 from being deformed when the bolt is fastened. 1A, FIG. 1B, and FIG. 3 show only a portion of the terminal block 2 in the vicinity of the first electrode 3, that is, only a part of the terminal block 2. Although not shown, The terminal block 2 is formed with a screwing portion for screwing a bolt.

Here, the flange portion 9 is provided at the proximal end of one side wall 8a and the distal end of the other side wall 8b, respectively, and the housing 8 is fixed to the terminal block 2 at two locations. The number of places where the housing 8 is bolted is not limited to two, but may be three or more, for example. Further, here, the housing 8 is fixed to the terminal block 2 by bolt fixing, but the structure for fixing the housing 8 to the terminal block 2 is not limited to this, and for example, an adhesive fixing using an adhesive, a lance or the like is used. The housing 8 may be fixed to the terminal block 2 by mechanical fixing using a locking mechanism.

In this embodiment, the housing 8 has a hollow cylindrical guide portion 10 through which the screw 7 is passed. The guide portion 10 is in a space surrounded by the

side walls

8a, 8b, the front wall 8c, and the upper wall 8d so that the axial direction thereof coincides with the vertical direction (the direction in which the screw 7 moves when the screw 7 is screwed). It is arranged and connected to both

side walls

8a and 8b by an electrode protecting rib 11 and a conductor protecting rib 12 which will be described later.

The inner diameter of the guide part 10 is slightly larger than the outer diameter of the head 7a of the screw 7. The lower end portion of the guide portion 10 is provided so as to face the surface of the first electrode 3 with a predetermined gap therebetween, and the second electrode 5 is provided in the gap between the guide portion 10 and the first electrode 3. The terminal portion 5b is inserted. The upper end portion of the guide portion 10 is connected to the upper wall 8d, and a tool hole 8e for communicating with the hollow portion of the guide portion 10 and for passing a tool for operating the screw 7 is formed in the upper wall 8d. Has been.

The guide unit 10 includes a screw holding mechanism 13 that holds the screw 7 in the guide unit 10 in a state of being separated from the first electrode 3 when the screwing fixing is released (when the screwing fixing is not performed). .

In this embodiment, the screw holding mechanism 13 includes a lance 14 and a retaining protrusion 15.

The lance 14 is formed integrally with the guide portion 10 and includes a shaft portion 14a extending downward, and a projection portion 14b formed to protrude inwardly at a lower end portion of the shaft portion 14a. Yes. The upper end portion of the shaft portion 14 a is connected to the guide portion 10, and the lance 14 is configured to be elastically deformed radially outward when the projection portion 14 b is pushed by the screw 7.

In the present embodiment, a pair of lances 14 are provided at positions where the guide portion 10 faces (positions facing in the radial direction). However, the number of lances 14 is not limited to this, and for example, three or more lances 14 are provided. May be provided. The distance between the protrusions 14 b of the pair of lances 14 (the distance between the tips of the protrusions 14 b) is made smaller than the outer diameter of the head 7 a of the screw 7.

The protrusion 14b of the lance 14 has a cross section parallel to the axial direction of the guide portion 10 (here, a cross section parallel to the

side walls

8a and 8b) formed in a substantially triangular shape, and the upper and lower surfaces thereof are the axis of the guide portion 10. It is formed to be inclined with respect to a direction perpendicular to the direction. That is, the upper surface of the protrusion 14b is formed to be inclined so as to protrude inward as it goes downward, and the lower surface of the protrusion 14b is formed to be inclined so as to protrude inward as it goes upward. Yes. Thereby, when the screw 7 moves up and down beyond the protrusion 14b, the lance 14 is easily deformed, and the screwing work and the work for releasing the screwing are facilitated.

The protrusion 14b of the lance 14 plays a role of supporting the head 7a of the screw 7 from below and holding the screw 7 in the guide portion 10 when the screw fixing is released (when the screw is not fixed). Details of the movement of the lance 14 when the screw 7 is detached will be described later.

The retaining protrusion 15 is for preventing the screw 7 from being pulled upward, and is provided on the upper portion (here, the upper end portion) of the guide portion 10 so as to protrude inward. Here, the pair of retaining protrusions 15 are provided at positions facing the guide portion 10 (positions facing in the radial direction), but the number of retaining protrusions 15 is not limited thereto. The distance between the retaining protrusions 15 (the distance between the tips of the retaining protrusions 15) is made smaller than the outer diameter of the head 7 a of the screw 7.

In this embodiment, the head 7a of the screw 7 is provided with an insulating coating. Thereby, generation | occurrence | production of the electric shock at the time of making the tool which operates the screw 7 contact the screw 7 is suppressed. The entire head 7a does not need to be coated with insulation, and at least the upper part of the head 7a that may be in contact with the tool may be coated with insulation.

The housing 8 has an electrode protection rib 11 which is formed at least on the insertion side of the second electrode 5 with respect to the guide portion 10 and is provided so as to cover the first electrode 3. The electrode protection rib 11 is formed in a plate shape parallel to the upper wall 8d, and is formed so as to protrude from the lower end portion of the guide portion 10 to the side and the base end side (insertion side of the second electrode 5). . Between the base end portion of the electrode protection rib 11 and the terminal block 2, a gap that does not allow an operator's finger to enter, more specifically, slightly larger than the thickness of the terminal portion 5 b of the second electrode 5. A gap is formed, and the terminal portion 5b of the second electrode 5 is inserted into the gap.

The electrode protection rib 11 prevents the operator from touching the first electrode 3 when the second electrode 5 is not connected (when the second electrode 5 is not inserted into the housing 8). When at least the end of the first electrode 3 on the base end side (the insertion side of the second electrode 5) is covered and the operator's finger is inserted through the opening on the base end side of the housing 8 In addition, the finger is not allowed to touch the first electrode 3. Further, the side end portions of the electrode protection rib 11 are connected to both

side walls

8 a and 8 b, whereby the electrode protection rib 11 supports the lower end portion of the guide portion 10 on the

side walls

8 a and 8 b of the housing 8. It also plays the role of

Furthermore, the housing 8 is provided with a conductor protection rib 12 provided above the electrode protection rib 11. The conductor protecting rib 12 is formed in a plate shape parallel to the electrode protecting rib 11 and is formed so as to protrude from the outer wall of the guide portion 10 to the side and the base end side (insertion side of the second electrode 5). Yes. The side end portions of the conductor protecting ribs 12 are connected to both

side walls

8a and 8b in the same manner as the electrode protecting ribs 11.

The conductor protecting rib 12 is formed so as to be slightly above the caulking portion 5a (on the opposite side to the terminal block 2) when the second electrode 5 is inserted into the housing 8, and the tip portion (base) The end portion on the end side is extended to the base end side so as to overlap with the contraction tube 20 covering the caulking portion 5 a in the longitudinal direction of the cable 4. Thereby, it is comprised so that an operator cannot touch the front-end | tip of the center conductor 4a of the cable 4 which is not covered with the shrinkable tube 20, and the front-end | tip surface of the crimp part 5a.

In the present embodiment, the contraction tube 20 is provided around the caulking portion 5a so that the operator cannot touch the caulking portion 5a. However, the present invention is not limited to this. For example, for conductor protection The ribs 12 and the

side walls

8a, 8b of the housing 8 are extended to the base end side (position overlapping the sheath 4b) from the caulking portion 5a, so that a finger or the like cannot be inserted between the sheath 4b and the housing 8. Thus, the shrinkable tube 20 can be omitted.

Further, the

side walls

8a and 8b and the upper wall 8d of the housing 8 are simply formed long, and the length of the housing 8 extending to the base end side from the caulking portion 5a is sufficiently secured, so that the base end side of the housing 8 is secured. Even if a finger or the like is inserted from the opening, it may be configured not to reach the caulking portion 5a, and the shrinkable tube 20 and the conductor protecting rib 12 may be omitted.

Further, a cover member that closes the opening on the proximal end side of the housing 8 is provided integrally or separately from the housing 8 so that a finger or the like cannot be inserted into the housing 8 from the opening on the proximal end side. It is also possible to omit the conductor protecting ribs 12.

However, in the above case, the housing 8 is enlarged by extending the housing 8 to the base end side, and when a lid member is provided, the structure of the housing 8 is complicated and molding by a mold is performed. This makes it difficult to perform the process and increases the number of parts. By adopting a configuration in which the shrinkable tube 20 is provided so as to cover the caulking portion 5a as in the present embodiment, the housing portion 8 is compact and has a simple structure that can be molded by a mold, but the connecting portion 6 is also provided. It is possible to suppress the operator from touching.

The members constituting the housing 8, that is, the

side walls

8a and 8b, the front wall 8c, the upper wall 8d, the guide portion 10, the electrode protecting ribs 11, and the conductor protecting ribs 12 are integrally formed. As the housing 8, for example, a material made of PBT (polybutylene terephthalate) or nylon can be used. When the current flowing through the connection portion 6 is large and heat resistance is required, the housing 8 can be made of, for example, high-tensile nylon (PA6T) or PPS (polyphenylene sulfide).

(Explanation of connection and disconnection procedures)
As shown in FIG. 5A, in the connection portion protection member 1, when the screw fixing is released (non-screw fixing), the screw 7 is positioned between the protrusion 14 b of the lance 14 and the retaining protrusion 15. It is held in the guide part 10. At this time, the protrusion 14 b of the lance 14 supports the head 7 a of the screw 7 from below, so that the screw 7 is prevented from coming out downward, and the screw 7 is held in the guide portion 10. When attaching the screw 7 to the housing 8 (that is, when assembling the connection portion protection member 1), the screw 7 may be inserted into the guide portion 10 from below the guide portion 10 while deforming the lance 14.

In a state where the head portion 7a of the screw 7 is supported by the protruding portion 14b, the lower end portion of the shaft portion 7b of the screw 7 is separated from the first electrode 3 with a gap larger than the thickness of the terminal portion 5b of the second electrode 5. The terminal portion 5b of the second electrode 5 is inserted into the gap.

When connecting the first electrode 3 and the second electrode 5, first, the second electrode is inserted into the housing 8 from the opening on the proximal end side of the housing 8, and the electrode protection rib 11 and the terminal block 2 are connected to each other. The terminal portion 5b of the second electrode 5 is inserted into the gap between the guide portion 10 and the first electrode 3 (the gap between the lower end portion of the screw 7 and the first electrode 3) via the gap therebetween. Thereafter, the tool 51 is engaged with the head 7a of the screw 7 to push the screw 7 downward.

Then, as shown in FIG. 5B, the lance 14 is deformed outward by the force of pushing the screw 7 downward, the locking by the protrusion 14b is released, and the screw 7 moves downward. Thereafter, the screw 7 is screwed into the screw hole 3a with the tool 51, whereby both the

electrodes

3 and 5 are fastened and electrically connected.

When the connection between the first electrode 3 and the second electrode 5 is released, the tool 51 is inserted from the tool hole 8e in the upper wall 8d, and the tool 51 is engaged with the head 7a of the screw 7, then the screw 7 is rotated to loosen the fastening of the

electrodes

3 and 5.

Then, as shown in FIG. 5C, the screw 7 moves upward as the screw 7 rotates, and the head 7a of the screw 7 moves upward while spreading the lance 14 outward. When the screw 7 is completely disengaged, the protrusion 14b moves inward by the elasticity of the lance 14, the screw 7 is lifted upward on the upper surface of the protrusion 14b, and the head 7a of the screw 7 protrudes. It is accommodated in the guide part 10 above the part 14b.

Thereafter, when the tool 51 is lifted upward as shown in FIG. 5D, the upward movement of the head 7a of the screw 7 is restricted by the retaining projection 15 and the engagement between the tool 51 and the head 7a is released. . As a result, the tool 51 can be removed without the screw 7 being pulled upward. The screw 7 released from the engagement with the tool 51 falls downward, and the head 7a is supported by the protruding portion 14b as shown in FIG. 5A. Thereafter, the second electrode 5 is removed from the housing 8.

(Operation and effect of the embodiment)
As described above, in the connection structure 100 according to the present embodiment, the screw 7 for screwing and the housing 8 made of an insulator fixed to the terminal block 2 and provided so as to cover the connection portion 6 are provided. The housing 8 has a hollow cylindrical guide portion 10 through which the screw 7 is passed, and the guide portion 10 removes the screw 7 from the first electrode 3 when the screwing fixing is released. The screw holding mechanism 13 is held in the guide portion 10 in a separated state.

By comprising in this way, it becomes possible to cover the connection part 6 which fixed both the

electrodes

3 and 5 by screwing with the connection part protection member 1, and it is set as the structure where an operator cannot touch the connection part 6 directly. In other words, the connection portion 6 can have a touch protection structure. As a result, it is possible to perform the connection work safely, and it is possible to suppress the occurrence of problems such as electric shock.

In the present embodiment, since the housing 8 is fixed to the terminal block 2, it is possible to ensure the safety of the worker even during the connection work.

For example, when the first electrode 3 is an electrode connected to a battery, if the battery is operated for some reason during the connection work of both the

electrodes

3 and 5, there is a possibility that the operator may get an electric shock. In this embodiment, since the housing 8 is fixed to the terminal block 2 and the live part is not always exposed even during the connection work, the battery is operated for some reason. In addition, it is possible to suppress the occurrence of problems such as electric shock.

In the present embodiment, since the screw 7 is held in the guide portion 10 of the housing 8 in a state of being separated from the first electrode 3 at the time of non-screw fixing, the screw 7 is fixed at the time of non-screw fixing. However, it plays a role of closing the hollow portion (hole through which the screw is inserted) of the guide portion 10 and can realize touch protection with a simple configuration that does not include a lid member that closes the hollow portion of the guide portion 10. When the screw 7 is pushed downward and brought into contact with the

electrodes

3 and 5, the screw 7 also becomes a live part, but in this embodiment, the head 7a of the screw 7 is provided with an insulating coating. Electric shock due to contact with the screw 7 can be suppressed.

Further, by adopting a configuration in which the screw 7 is held in the guide portion 10, the screw 7 is not unintentionally dropped from the housing 8, and when the screw 7 is released, the screw 7 is automatically guided. Since it comes to be accommodated in the part 10, a connection work and a connection release work become very easy.

(Summary of embodiment)
Next, the technical idea grasped from the embodiment described above will be described with reference to the reference numerals in the embodiment. However, the reference numerals and the like in the following description do not limit the constituent elements in the claims to members or the like specifically shown in the embodiment.

[1] It has a connection part (6) for screwing and fixing the first electrode (3) provided on the terminal block (2) and the second electrode (5) provided at the end of the cable (4). A connection structure (100), a screw (7) for screwing, and a housing (8) made of an insulator fixed to the terminal block (2) and provided to cover the connection portion (6) The housing (8) has a hollow cylindrical guide part (10) through which the screw (7) is passed, and the guide part (10) is the screw A connection structure (100) having a screw holding mechanism (13) that holds the screw (7) in the guide portion (10) in a state of being separated from the first electrode (3) when the fixing is released. ).

[2] The screw holding mechanism (13) is integrally formed with the guide portion (10) and protrudes inwardly to a shaft portion (14a) extending downward and a lower end portion of the shaft portion (14a). A protrusion (14b) formed so as to have a lance (14) that is elastically deformed radially outward, and when the screwing is released, the protrusion (14b) The connection structure (100) according to [1], configured to hold the screw (7) in the guide portion (10) by supporting the head (7a) of the screw (7) by ).

[3] The screw holding mechanism (13) is provided on the upper portion of the guide portion (10) so as to protrude inward, and a retaining protrusion (15) that prevents the screw (7) from being pulled upward. The connection structure (100) according to [1] or [2].

[4] The housing (8) includes a pair of side walls (8a, 8b) arranged opposite to each other, a front wall (8c) connecting the tip portions of the side walls (8a, 8b), and both side walls ( 8a, 8b) and the upper wall (8d) formed with a tool hole (8e) through which a tool (51) for operating the screw (7) is connected by connecting the upper end of the front wall (8c). An electrode protection rib (11) which is integrally formed and is formed at least on the insertion side of the second electrode (5) with respect to the guide portion (10) and is provided so as to cover the first electrode (3). The connection structure (100) according to [1] or [2].

[5] The connection structure (100) according to any one of [1] to [4], wherein the head (7a) of the screw (7) is provided with an insulating coating.

[6] Provided in the connection part (6) for fixing the first electrode (3) provided on the terminal block (2) and the second electrode (5) provided at the end of the cable (4) by screwing. A connecting part protecting member (1), which is a screw (7) for screwing, and a housing made of an insulator fixed to the terminal block (2) and provided to cover the connecting part (6) ( 8), and the housing (8) has a hollow cylindrical guide portion (10) through which the screw (7) is passed, and the guide portion (10) is released from the screw fixing. And a connection portion protection member (1) having a screw holding mechanism (13) for holding the screw (7) in the guide portion (10) in a state of being separated from the first electrode (3).

As mentioned above, although embodiment of this invention was described, embodiment described above does not limit the invention which concerns on a claim. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

The present invention can be appropriately modified and implemented without departing from the spirit of the present invention.

For example, in the above embodiment, the case where the number of the cables 4 connected to the terminal block 2 is one has been described, but the present invention can also be applied to the case where a plurality of cables 4 are connected to the terminal block 2.

When a plurality of cables 4 are connected to the terminal block 2, the connection portion protection member 1 may be provided individually so as to correspond to each cable 4, or the connection portion protection member 1 having an integral structure common to each cable 4. May be provided. In this case, it is good also as a structure which connected the some housing 8 to the side.

DESCRIPTION OF SYMBOLS 1 ... Connection part protection member 2 ... Terminal block 3 ... 1st electrode 4 ... Cable 5 ... 2nd electrode 6 ... Connection part 7 ... Screw 7a ... Head 7b ... Shaft part 8 ... Housing 10 ... Guide part 11 ... For electrode protection Rib 12 ... Conductor protection rib 13 ... Screw holding mechanism 14 ... Lance 14a ... Shaft portion 14b ... Projection portion 15 ... Retaining projection 20 ... Shrink tube 100 ... Connection structure

Claims

A connection structure having a connection portion for fixing the first electrode provided on the terminal block and the second electrode provided on the end of the cable by screwing,
A screw for screwing,
A connection part protection member having a housing made of an insulator fixed to the terminal block and provided to cover the connection part,
The housing has a hollow cylindrical guide portion through which the screw passes.
The guide portion has a screw holding mechanism that holds the screw in the guide portion in a state of being separated from the first electrode when the screwing fixation is released.
Connection structure.
The screw holding mechanism is
A shaft portion formed integrally with the guide portion and extending downward, and a projection portion formed so as to protrude inwardly at a lower end portion of the shaft portion, and elastically outward in the radial direction. Having a deforming lance,
It is configured to hold the screw in the guide portion by supporting the head portion of the screw by the protrusion when releasing the screw fixing.
The connection structure according to claim 1.
The screw holding mechanism is
Provided at the upper part of the guide part so as to protrude inward, and having a retaining protrusion for suppressing the screw from being pulled upward;
The connection structure according to claim 1 or 2.
The housing is
A pair of side walls opposed to each other, a front wall that connects the front end portions of the side walls, a hole for a tool that connects the side walls and the upper end portion of the front wall and passes the tool that operates the screw are formed. An integrated upper wall,
Having at least an electrode protecting rib formed on the insertion side of the second electrode with respect to the guide portion and provided to cover the first electrode;
The connection structure according to claim 1 or 2.
Insulation coating is applied to the head of the screw,
The connection structure according to any one of claims 1 to 4.
A connection portion protection member provided at a connection portion for fixing the first electrode provided on the terminal block and the second electrode provided at the end of the cable by screwing,
A screw for screwing,
A housing made of an insulator fixed to the terminal block and provided so as to cover the connection portion;
The housing has a hollow cylindrical guide portion through which the screw passes.
The guide portion has a screw holding mechanism that holds the screw in the guide portion in a state of being separated from the first electrode when the screwing fixation is released.
Connection part protection member.