JPH0613070U - Bolted connector - Google Patents

Abstract

(57) [Summary] [Purpose] When a male connector and a female connector are fitted together using bolts and nuts, if excessive torque acts on the bolts, the bolts can be broken to break the connector. (EN) Provided is a bolt-tightened connector which prevents a broken housing and easily removes the broken bolt. In a bolt tightening type connector to be fitted using a bolt and a nut, the bolt 20 is provided with two heads 22 and 24 having mutually different diameters coaxially adjacent to each other. A constricted portion 28 that breaks when a load of a predetermined amount or more is applied is formed on the outer side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bolt tightening type connector in which a pair of connectors are fitted by tightening a bolt and a nut.

[0002]

[Prior art]

 2. Description of the Related Art A connector that connects electrical components to each other by fitting a male connector and a female connector to each other has been conventionally known. This connector is widely used in automobiles, and as the electrical components mounted on automobiles have become more sophisticated and complex, the number of poles of the connectors that connect the electrical components to each other has increased. Therefore, it is difficult or impossible to fit the male connector and the female connector by pushing the male connector and the female connector with each other in the fitting direction by the operator's hand.

For this reason, a bolt-tightened connector in which one of the female connector and the male connector is provided with a bolt and the other is provided with a nut and the bolt and the nut are screwed into each other to fit the two connectors together. It is used. However, this bolt-tightened connector has a problem that the connector housing may be broken if the bolts are tightened too much. In order to solve this problem, a bolt tightening type connector having a broken constriction portion on the bolt was devised (Publication No. 60-875). This conventional bolt tightening type connector will be described with reference to the drawings.

FIG. 7 is a fragmentary sectional view showing a female connector and a bolt of a conventional bolt tightening type connector. A tightening bolt 14 is provided at the center of the housing 12 of the female connector 10 of this bolt tightening type connector, and this tightening bolt 14 is screwed into a nut provided on a male connector (not shown). The male connector and the female connector are fitted together. Further, the bolt 14 is formed with a broken neck portion 14a. When the bolt is tightened with an excessive torque, the broken neck portion 14a is first broken, so that the housing is prevented from being broken. .

[0005]

[Problems to be solved by the device]

 Here, a case will be described in which an excessive torque acts on the conventional bolt tightening type connector, and the bolt 14 breaks at the breaking neck portion 14a. Since the bolt 14 is fixed to the housing 12 by the washer 16 and the bolt stopper 18, if the bolt 14 is broken at the breaking neck portion 14, the bolt 14 cannot be restrained effectively, and the bolt head 14b side is away from the housing 12. It comes off easily.

On the other hand, there is a problem in that the work of removing the bolt remaining in the state of being screwed into the male connector is not easy because it is performed using a special tool. In view of the above circumstances, the present invention prevents the connector housing from being broken when the male connector and the female connector are fitted with each other by using the bolt and the nut, and the excessive torque acts on the bolt. An object of the present invention is to provide a bolt-tightened connector that can easily remove the bolt when the bolt is broken.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the bolt-tightened connector of the present invention is provided with a bolt on one connector of a pair of connectors to be fitted with each other, and at the other connector with a nut screwed with the bolt. In a bolted connector provided with the bolt, the bolt is formed coaxially adjacent to each other and has two heads having different diameters and formed on the outer side of the inner head of the two heads. It is characterized in that it is provided with a rupture portion that ruptures when a load of a predetermined amount or more is applied.

The diameter of the inner head is preferably larger than the diameter of the outer head. The predetermined load is set to be equal to or lower than the breaking strength of the connector housing to prevent the housing from breaking.

[0009]

[Action]

 If a load larger than a predetermined value is applied to the bolt when the bolt-tightened connector is fitted, the fractured portion breaks. The bolt is provided with two head portions having different diameters adjacent to each other and coaxially with each other, and the break portion is formed outside the inner head portion of the two head portions. Therefore, when the fractured portion is fractured, only the outer head portion comes off the bolt. In other words, since the inner head remains connected to the bolt without being removed, the bolt can be easily removed from the connector by rotating the inner head.

If the diameter of the inner head is larger than the diameter of the outer head, the bolt can be removed from the connector with a smaller torque before breakage.

[0011]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a bolt used in the bolt tightening type connector of the first embodiment of the present invention, and FIG. 2 is a front view of the bolt shown in FIG. This bolt is applied to all conventionally known bolt tightening type connectors, and is used by being provided in the female type connector shown in FIG. 7, for example.

A threaded portion 20 a is formed at the upper end of the bolt 20, and the head 22 is screwed into the threaded portion 20 a, whereby the head 22 and the head 24 are arranged adjacent to each other. Further, the head 22 is provided with a flange 22a. Since the outer diameter of the screw portion 20a is smaller than the diameter of the bolt shaft 26 and the taper 26a is formed, the flange 22a and the head portion 24 do not come into contact with each other. A plurality of constricted portions 28 (corresponding to the screw bottom) are formed outside the boundary between the screw portion 20a and the bolt shaft 26, and when a load equal to or more than a predetermined load is applied, the constricted portions are formed. Any of the 28 will break. This predetermined load is less than the breaking strength of the connector housing, which prevents the housing from being broken. In this embodiment, the size of the head 22 is M6 and the size of the head 24 is M8.

A threaded portion 20b is formed in the lower portion of the bolt 20, and a nut provided in a male connector (not shown) is screwed into the threaded portion 20b. A groove 20c for receiving a bolt stopper (not shown) is formed in the central portion of the bolt shaft 26. This groove is provided at two locations on the bolt shaft 26, one of which engages with a bolt holding arm (not shown) of the bolt holding housing 70 (Fig. 6), and the other of which is fixed to the male connector. You may make it engage with a metal fitting (not shown).

Next, a method of manufacturing the head of the bolt 20 will be described. The screw portion 20a can be formed by rolling. This rolling processing is a processing method in which a material (bolt shaft 26 in this embodiment) is put between flat plates or rolls with grooves and pressure is applied by a die or roll to form screws or gears by plastic deformation. Therefore, the threaded portion can be manufactured at low cost. The head 22 can be manufactured by a known method similar to the manufacturing of nuts. Further, as shown in FIG. 3, the head portion 22 may be fixed to the bolt shaft 26 by crushing the top portion 20d of the screw portion 20a. In this case, the head portion 22 can be fixed to the bolt shaft 26 without forming the screw portion 20a, but at least one constricted portion 28 is formed outside the head portion 24. There are various methods for fixing the head 22 to the bolt shaft 26, such as welding, press fitting, and adhesion.

Next, a case where the bolt 20 is used for fitting a connector will be described. The bolt 20 is provided in, for example, the housing of the female connector shown in FIG. 7, and the housing of the male connector (not shown) is provided with a nut to be screwed into the screw portion 20b, whereby the two connectors are fitted together. At the time of this fitting, for example, when the screw portion 20b and the nut are not properly screwed together, the operator may apply a large torque to the head portion 22. Even in such a case, the predetermined load that the constricted portion 28 can withstand is equal to or lower than the breaking strength of the connector housing. Therefore, before the housing is broken, the constricted portion 28 starts to break and the screw is broken. The part 20b is broken. Therefore, it is possible to prevent the housing from being broken. Further, although the head portion 22 is disengaged from the bolt shaft 26 due to the breakage of the constricted portion 28, the head portion 24 remains, and therefore the bolt 20 is removed from the housing by rotating the head portion 24 with a wrench or the like. It can be removed. In addition, since the work of removing the head 22 is M6 and the size of the head 24 is M8 as described above, the work can be performed more easily than when the fitting is performed. Therefore, even if the screw portion 20b and the nut are screwed together improperly, the bolt 20 can be easily removed.

In the above example, the case where the threaded portion 20b and the nut are not properly screwed together has been described. However, after both are properly screwed and the fitting of the connector is completed, the head 22 is further rotated. The same applies when the bolt 20 and the nut are forcibly screwed together by being rotated. Next, a modified example of the end shape of the bolt shaft 26 (see FIG. 1) into which the head 22 (see FIG. 1) is inserted will be described with reference to FIGS. 4 and 5.

FIG. 4 shows an example in which the end portion 40 has a hexagonal shape. An outer head (not shown) is press-fitted into this end 40. Further, the constricted portion 42 that breaks under a predetermined load or more is also formed in a hexagonal shape. FIG. 5 shows an example in which the end portion 50 has a rectangular shape. An outer head (not shown) is press-fitted into this end 50. Also, the constricted portion 52 that breaks under a predetermined load or more is also formed in a square shape.

4 and 5 show quadrangular and hexagonal end portions, the present invention is not limited to this, and the end portion into which the head is press-fitted may have other polygonal shapes. Including. Next, a second embodiment of the present invention will be described. FIG. 6 is a partial cross-sectional view showing the main parts of the bolt tightening type connector of the second embodiment, which is an example in which the vicinity of the head of the bolt 60 is formed by cutting.

In the first embodiment, the head 22 is screwed (see FIG. 1), but in the present embodiment, the head 62, the flange 62a, and the head 64 are formed by cutting one rod. , A constricted portion 68 and the like are formed. The heads 62 and 64 of the bolt 60 are held by the bolt holding housing 70 so that the female connector housing 80 and a male connector housing (not shown) are fitted together. The action of the bolt 60 when the two connector housings are fitted to each other is similar to that of the first embodiment, and therefore its explanation is omitted.

[0020]

[Effect of device]

 As described above, in the bolt tightening type connector of the present invention, a bolt for fitting a pair of connectors is provided with two heads coaxially adjacent to each other, and more than a predetermined load is applied to the bolt. Since the breaking portion that breaks when applied to the housing is formed, it is possible to prevent the housing from being broken, and even if the breaking portion is broken, the bolt can be easily removed.

[Brief description of drawings]

FIG. 1 is a perspective view of a bolt used in a bolt tightening type connector according to a first embodiment of the present invention.

FIG. 2 is a front view of the bolt shown in FIG.

FIG. 3 is a cross-sectional view showing an example in which the head portion is fixed to the bolt shaft by crushing the top portion of the screw portion.

FIG. 4 is a perspective view showing a modified example of the end shape of the bolt shaft into which the head is inserted.

FIG. 5 is a perspective view showing a modified example of the end shape of the bolt shaft into which the head is inserted.

FIG. 6 is a partial cross-sectional view showing a main part of a bolt tightening type connector according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of an essential part showing a conventional bolt tightening type connector.

[Explanation of symbols]

 20, 60 Bolt 22, 24, 62, 64 Head 28, 68 Constriction

Claims (1)

[Scope of utility model registration request] 1. A bolted connector in which one connector of a pair of mating connectors is provided with a bolt, and the other connector is provided with a nut screwed with the bolt, wherein the bolts are mutually 2 adjacent to each other and coaxially with different diameters
Bolt tightening, characterized in that it includes two heads and a break portion formed outside the inner head of the two heads and breaking when a load larger than a predetermined load is applied. Type connector.