JP2000235881A - Electrical connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture lock arms, to enhance the locking force of the lock arms, and to easily release the locked state of connection terminals on the lock arms. SOLUTION: Rear holders 4 inserted into a housing 3 from the rear end face 24 side are inserted halfway into and engaged with the housing 3 at a temporary engagement position allowing connection terminals 2 to be inserted into the housing 3 and pressed fully into and engaged with the housing 3 at a proper engagement position where the connection terminals 2 are locked. A plurality of terminal housing holes 28 are formed in two rows within the housing 3. Each rear holder 4 is formed substantially into a plate shape, and provided with a holder body 41 entering a gap 29 in the housing 3 and a lock arm 45 entering the terminal housing hole 28, and the width of the lock arm 45 is made slightly smaller than the terminal housing hole 28. Window parts 37 for communicating the terminal housing holes 28 with the exterior are provided in an outer wall 21 of the housing 3, and the locked state of the connection terminals 27 on the lock arms 45 is released by using the window parts 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connector which can be used, for example, in a wire harness of an automobile and locks a connection terminal accommodated in a housing by a rear holder engaged with a rear portion of the housing.

[0002]

2. Description of the Related Art Conventionally, for example, in an electrical connector of a wire harness, it is usual that a connection terminal housed in a housing is locked by a flexible locking arm. This locking arm is often provided integrally within the housing. However, in this case, since the locking arm is provided in the housing having a complicated structure, the mold is extremely congested and expensive. Further, since the locking arm is formed in the terminal receiving hole for receiving the connection terminal, the width of the locking arm must be extremely small with respect to the width of the terminal receiving hole, and a sufficient locking force can be obtained. There may not be.

On the other hand, in order to improve the difficulty of manufacturing the housing and the size of the locking arm, the locking arm may be provided on a separate rear holder as shown in FIGS. In this case, a rear holder c is fitted to the hole b of the housing a so as to be movable back and forth, and the rear holder c can be engaged with the housing a at two positions by engaging means (not shown). The first position is a temporary engagement position where the rear holder c is partially inserted into the housing a, and the second position is a full engagement position where the rear holder c is completely pushed into the housing a. I have.

[0004] Then, a connection terminal e to which the electric wire d is connected.
Is inserted into the rectangular tube portion f of the rear holder c at the temporary engagement position of the rear holder c, and the projection i of the locking arm h is engaged with the hole g of the connection terminal e. From this state, rear holder c
Is pushed into the full engagement position, the front portion j of the locking arm h
Rides on the guide portion k of the housing a to reinforce the locking force of the locking arm h.

[0005]

However, since the rear holder c has the rectangular tube portion f, simplification of the mold structure has not been sufficiently solved. That is, the mold has a punching structure, and is not necessarily sufficiently simplified. Further, when releasing the locking state between the locking arm h and the connection terminal e, the jig is inserted into the square tube portion f from the rear surface side of the rear holder c, so that the rear holder c and the connection terminal e are damaged by the jig. There is a fear.

Similarly, in an electric connector having a locking arm integrally with a housing, when a connection terminal is pulled out of the housing, a jig is inserted along a wire from a rear portion of the housing, or a jig is provided on the front side of the housing. Insert from the insertion hole of the mating connection terminal, bend the locking arm with the jig to release the locking state between the locking arm and the connection terminal, and then pull the wire backward to remove the connection terminal from the housing. I'm extracting. Therefore, when releasing the locked state between the connection terminal and the locking arm, the jig has to be inserted from the insertion port of the mating connection terminal of the housing. There is a possibility that the surface may be damaged.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an electrical connector in which a locking arm can be easily manufactured.

Another object of the present invention is to provide an electrical connector which can improve the locking force of a locking arm.

It is a further object of the present invention to provide an electric connector which can easily release a locked state between a connection terminal inserted into a housing and a locking arm through a window provided in the housing. It is in.

[0010]

An electric connector according to the present invention for achieving the above object comprises a cable connected to a cable.
A housing accommodating one or more connection terminals, a rear holder engaged with a rear portion of the housing to hold the connection terminals so as not to come out of the housing, and engagement means for engaging the housing with the rear holder. An electrical connector, wherein the rear holder has a substantially plate-like shape, and a main body portion which enters a gap of the housing and engages with the housing via the engaging means; and a housing provided at a tip of the main body portion. And a locking arm that enters each of the terminal receiving holes and locks the connection terminal.

[0011] An electrical connector according to the present invention includes a housing for accommodating one or more connection terminals connected to a cable;
A rear holder that engages with a rear portion of the housing and holds the connection terminal so as not to come out of the housing;
An electrical connector comprising the housing and engaging means for engaging the rear holder, wherein the rear holder enters a gap in the housing and engages with the housing via the engaging means; A locking arm provided at a tip of the housing for respectively entering each terminal accommodating hole of the housing to lock the connection terminal, and locking portions of the connection terminal and the locking arm on upper and lower walls of the housing. , A window portion is provided in the vicinity of the terminal for communicating the outside with the terminal receiving hole.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is an assembled sectional perspective view of the first embodiment, in which a male connection end 2 having an electric wire 1 connected to a rear portion is accommodated in a housing 3, and a connection terminal 2 is provided by a rear holder 4 engaged with the rear portion of the housing 3. Is shown in a locked state. FIG. 2 is an exploded cross-sectional perspective view excluding the connection terminal 2, and FIG. 3 is an exploded vertical cross-sectional view corresponding to FIG.

The connection terminal 2 is formed from a single conductive metal plate, and can be connected to a mating female connection terminal (not shown) at the front of the rectangular tubular terminal body 11 of the connection terminal 2. A flat-blade-shaped terminal connection portion 12 is provided. A core wire crimping portion 1 for crimping a core wire of the electric wire 1 is provided at a rear portion of the terminal body portion 11.
3 and a coating crimping part 14 for crimping the coating of the electric wire 1. The terminal body 11 is provided with a stabilizer 15 for stabilizing the posture of the connection terminal 2 and a locking hole 16 with which a locking portion of a locking arm of the rear holder 4 is engaged.

The housing 3 is formed of a synthetic resin material having electrical insulation, and a plurality of connection terminals 2 are connected to the upper and lower
It can be accommodated in a row. The housing 3 includes upper and lower outer walls 21, left and right outer walls 22, a front end face 23 and a rear end face 24.
The front end surface 23 is provided with a tubular portion 25 into which a mating connector housing (not shown) is fitted. The inside of the housing 3 is partitioned by a partition wall 26 separating the upper and lower sides and a plurality of partition walls 27 separating the left and right sides, and a plurality of terminal receiving holes 28 for receiving the connection terminals 2 are formed. On the inner surface side of the upper and lower outer walls 21, upper and lower gaps 29 for receiving the rear holder 4 are formed across the partition wall 27 and the terminal accommodation holes 28.
It is formed so that it may communicate with.

An end wall 31 having an opening 30 through which the terminal connection portion 12 of the connection terminal 2 is inserted is formed at a front portion of the terminal receiving hole 28, and the terminal connection portion 12 is formed with an opening 3 on the inner surface of the end wall 31.
A guide surface 31a for guiding to zero is provided. Further, the terminal housing hole 28 includes a main body housing portion 32 that houses the terminal main body 11 of the connection terminal 2 densely, a crimping portion housing portion 33 that houses the covering crimping portion 14 of the connection terminal 2, and a connection terminal 2. A stabilizer guide groove 34 for guiding the stabilizer 15 of the rear holder 4 and an arm accommodating portion 35 for accommodating a later-described locking arm of the rear holder 4 are formed.

The upper and lower outer walls 21 are formed with a locking hole 36 for engaging a later-described locking projection of the rear holder 4 and a window 37 communicating with the terminal receiving hole 28 from the outside. The hole 36 and the window 37 are communicated with the partition removed. These windows 37 allow a jig or the like to be described later for releasing the locking between the locking arm and the connection terminal 2 to pass therethrough. On the front end surface 23 side of the window portion 37, a regulating wall 38 which constitutes an outer wall of the arm accommodating portion 35 and regulates the movement of the locking arm is provided. Is provided. Vertical part 38 of regulating wall 38
The horizontal portion a and the horizontal portion 38b abut on the front surface and the outer surface of the non-deflectable locking arm, respectively, and the horizontal portion 38b abuts on the front surface of the bent locking arm.

On the other hand, the rear holder 4 is formed by an injection molding machine having a mold having a two-layered structure and a substantially plate-shaped member made of an electrically insulating synthetic resin material, and enters the gap 29 of the housing 3 without rattling. It has a main body 41. The outer surface of the holder body 41 is provided with a plurality of locking projections 42 that can abut the rear end surface 24 of the housing 3 and that can engage with the locking holes 36. On both left and right sides of the locking projection 42, the holder body 41 has gaps 43, 4 facing in the front-rear direction.
4 are formed, and a portion sandwiched between the gaps 43 and 44 can be bent. A connection terminal 2 is provided at the front end of the holder body 41.
A plurality of flexible locking arms 45 for locking
Are formed so as to be able to enter the terminal receiving holes 28 of the housing 3 respectively. The locking arm 45 has a width slightly smaller than the terminal receiving hole 28 of the housing 3, and the locking arm 45 is provided with a locking portion 45 a that can be engaged with the locking hole 16 of the connection terminal 2. A flange 46 is provided on the outer surface of the rear part of the holder main body 41 to abut on the rear end face 24 of the housing 3 and regulate the forward movement of the rear holder 4.

Here, the shape and position of each part of the connection terminal 2, the housing 3, and the rear holder 4 are designed to operate as shown in FIGS. That is, FIG. 4 shows a state where the rear holder 4 is engaged with the housing 3 at a temporary engagement position where the rear holder 4 is inserted halfway, and the connection terminal 2 is inserted into the housing 3 in this state. At this time, the locking projection 42 of the rear holder 4 abuts on the rear end face 24 of the housing 3, and the locking portion 45 a of the locking arm 45 of the rear holder 4 is
Of the terminal housing hole 28 before and after.

In this state, the connection terminal 2 is inserted into the terminal receiving hole 28.
The terminal body 11 of the connection terminal 2 presses the locking portion 45a of the locking arm 45 outward, and the locking arm 45
While bending outward. When the locking hole 16 of the connection terminal 2 passes the locking portion 45a of the locking arm 45, the locking arm 45 is restored as shown in FIG. Combine.

Next, when the rear holder 4 is pushed forward after all the connection terminals 2 have been inserted, the locking projections 42 of the rear holder 4 deform the portion sandwiched by the gaps 43 and 44 inward while bending the portion of the housing 3 inward. It enters the gap 29. As a result, the rear holder 4 advances to the full engagement position together with the connection terminal 2, and the terminal main body 11 of the connection terminal 2 enters the main body housing 32 of the housing 3 as shown in FIG. Touch Further, the locking arm 45 enters the arm accommodating portion 35, and the front surface of the locking arm 45 is
a. At the same time, the locking projection 42 engages with the locking hole 36 and the flange 46 contacts the rear end face 24.
At this time, the horizontal portion 38b of the regulating wall 38 is
, And the locking force of the locking arm 45 to the connection terminal 2 is satisfactorily held.

On the other hand, when the connection terminal 2 is inserted only partway when the rear holder 4 is at the temporary engagement position with respect to the housing 3, as shown in the upper part of FIG. 11 leaves the locking arm 45 in an outwardly bent state. When the rear holder 4 is pushed toward the full engagement position in such a state, the front surface of the locking arm 45 is moved to the horizontal portion 3 of the regulating wall 38 of the housing 3 as shown in the upper part of FIG.
8b, the rear holder 4 cannot be advanced, and the operator is made aware that the connection terminal 2 is not fully inserted. 7 and 8 show a state in which the connection terminal 2 is normally accommodated in the housing 3.

On the other hand, when the connection terminal 2 is inserted upside down, the terminal body 11 of the connection terminal 2 is attached to the front wall of the crimping portion housing portion 33 of the terminal housing hole 28 as shown in the upper part of FIG. The contact makes it difficult to insert the connection terminal 2 to a predetermined position. If the connection terminal 2 is pushed in, FIG.
As shown in the lower part, the connection terminal 2 moves forward without engaging with the locking arm 45, and the end of the terminal connection portion 12 of the connection terminal 2 comes into contact with the end wall 31 of the housing 3. Or Figure 1
As shown at 0, the distal end of the terminal connection portion 12 abuts on the end wall 31 and the coating crimping portion 14 of the connection terminal 2 abuts on the inner surface of the holder main body 41 of the rear holder 4. This allows the operator to recognize that the connection terminal 2 is reversely inserted.

When the connection terminal 2 that has been properly inserted is removed from the housing 3, the rear holder 4 is first moved from the full engagement position to the temporary engagement position, as shown in FIG. Next, the jig 51 is inserted into the front lower surface of the locking arm 45 from the window 37 of the housing 3, and the locking arm 45 is bent outward to release the engagement with the connection terminal 2. Pull out in the direction of arrow A.

FIG. 12 is an assembled sectional perspective view of the second embodiment, in which a female connection terminal 6 to which the electric wire 5 is connected to the rear portion is accommodated in a housing 7, and a rear holder 8 engaged with the rear portion of the housing 7. This shows a locked state. FIG.
3 is an exploded cross-sectional perspective view showing the connection terminal 6 excluding, and FIG. 14 is an exploded vertical cross-sectional view showing the connection terminal 6 together. A core wire crimping portion 62 is provided at a rear portion of the rectangular tubular terminal body portion 61 of the connection terminal 6.
And a covering and crimping portion 63 are provided. Terminal body 61
Is provided with a fixed contact 64 and a movable contact piece 65 that can be pressed against the terminal connection portion of a male connection terminal (not shown) on the other side, and a stabilizer 66 is formed on the outer surface of the terminal body 61, The stabilizer 66 is locked by the rear holder 8.

The housing 7 is provided with upper and lower outer walls 71, left and right outer walls 72, a front end face 73 and a rear end face 74. The inside of the housing 7 is partitioned by a partition 75 and a partition 76, and a plurality of terminal receiving holes 77 are formed. Formed, upper and lower outer walls 71
A gap 78 is formed on the inner surface side of. Terminal receiving hole 7
An end wall 81 having an opening 80 is provided at a front portion of 7, and a guide surface 81 a is formed on an outer surface of the end wall 81. In the terminal receiving hole 77, a main body receiving portion 82 for closely receiving the terminal main body 61 of the connection terminal 6 and a part of a locking arm described later is provided.
And a crimping portion accommodating portion 83 for accommodating the covering crimping portion 63 of the connection terminal 6 and an arm accommodating portion 8 for accommodating another portion of the locking arm.
4 and a locking groove 85 for engaging a locking projection, described later, of the rear holder 8 are formed. A window 86 is formed on the upper and lower outer walls 71 and communicates with the terminal receiving hole 77 from outside, and a regulating wall 87 is provided on the front end face 73 side of the window 86.
The regulating wall 87 has a vertical portion 87a and a horizontal portion 87b, and forms an outer wall of the arm housing portion 84.

On the other hand, the rear holder 8 has a substantially plate shape, and a locking projection 92 and gaps 93, 94 are formed on the outer surface of the holder body 91.
A plurality of flexible locking arms 95 are provided at the front end of the holder main body 91. The locking arm 95 has a width slightly narrower than the terminal receiving hole 77 of the housing 7, and the locking arm 95 has a first locking portion 95 a for locking the rear portion of the terminal body 61 of the connection terminal 6. And a second locking portion 95b for locking the rear portion of the stabilizer 66 of the connection terminal 6, and first and second pressing portions 95c and 95d for pressing the side portion and the front portion of the stabilizer 66, respectively, are provided integrally. Have been. A flange 96 is provided at the rear of the holder body 91.

Also in this second embodiment, the respective parts of the connection terminal 6, the housing 7, and the rear holder 8 are designed to operate as shown in FIGS. When the connection terminal 6 is inserted into the housing 7 at the temporary engagement position of the rear holder 8, the terminal body 61 of the connection terminal 6 moves forward while bending the locking arm 95 outward, and as shown in FIG. Of the locking arm 95 is the first locking portion 9 of the locking arm 95.
After passing through 5a, the locking arm 95 is restored, and the first locking portion 95a locks the rear portion of the terminal body 61.
At the same time, the second locking portion 95b locks the rear portion of the stabilizer 66, and the first and second pressing portions 95c and 95d press the side portion and the front portion of the stabilizer 66, respectively.

When the rear holder 8 is pushed into the front full engagement position, the terminal body 61 of the connection terminal 6 enters the body housing 82 of the housing 7 as shown in the lower part of FIG. And the first and second holding pieces 95c and 95d of the locking arm 95 are
, The second locking portion 95b enters the arm housing portion 84 and abuts on the vertical portion 87a of the regulating wall 87. at the same time,
The locking projections 92 of the rear holder 8 correspond to the locking grooves 8 of the housing 7.
5 and the flange 96 of the rear holder 8 contacts the rear end surface 74 of the housing 7. At this time, the horizontal portion 87b of the restricting wall 87 of the housing presses the outer surface of the second locking portion 95b of the locking arm 95 of the rear holder 8 so that the locking force with respect to the connection terminal 6 is favorably held.

Here, when the insertion of the connection terminal 6 is stopped halfway while the rear holder 8 is at the temporary engagement position,
As shown in the upper part of FIG.
6 deflects the locking arm 95 outward. Therefore, even if the rear holder 8 is pushed toward the full engagement position, the second pressing portion 95d of the locking arm 95 is moved to the vertical portion 87 of the regulating wall 87.
a, the forward movement of the rear holder 8 becomes impossible, and the operator is made aware that the connection terminal 6 is not completely inserted when the rear holder 8 is at the temporary engagement position.

When the connection terminal 6 is inserted upside down as shown in FIG. 17, the terminal body 61 of the connection terminal 6 comes into contact with the rear part of the locking arm 95 of the rear holder 8 and the connection terminal 6 is in contact with the partition 75 of the housing 7. In addition, the core wire crimping portion 62 of the connection terminal 6 comes into contact with the holder main body 91 of the rear holder 8, and it becomes difficult to insert the connection terminal 6.

On the other hand, when removing the connection terminal 6 normally inserted into the housing 7 from the housing 7, the rear holder 8 is first moved to the temporary engagement position as shown in FIG.
Then, the jig 51 ′ is moved from the window 86 of the housing 7 to the second
And the connecting arm 6 is disengaged by bending the locking arm 95 outward, and the electric wire 5 is pulled out in the direction of arrow A.

As described above, in the above-described first and second embodiments, the rear holders 4 and 8 are formed in a substantially plate-like shape. The width of 45, 95 is set to the terminal accommodation hole 28 of the housing 3, 7,
77, a plurality of locking portions 95a, 95b
And the first and second pressing portions 95c and 95d can be provided, and the locking arms 45 and 95 can be provided.
Can be pressed by the regulating walls 38, 87, so that the locking force of the locking arms 45, 95 can be improved.

Further, since the housings 3 and 7 have no locking arms, the structure of a mold for molding the housings 3 and 7 is simplified, and the manufacturing cost of the housings 3 and 7 can be reduced. Further, the guide surfaces 31a, 81a can be provided on the end walls 31, 81 of the housings 3, 7, so that the work of inserting the connection terminal 2 and the work of coupling with the mating connector become easy. Furthermore, since the connection terminals 2 and 6 can be inserted in parallel to the axes of the housings 3 and 7, the work of inserting the connection terminals 2 and 6 is facilitated, and the insertion of the connection terminals 2 and 6 halfway or upside down is prevented. Therefore, reliability can be improved.

Then, the connection terminals 2, 6 and the rear holder 4,
8, the upper and lower outer walls 21 of the housings 3, 7
Since it can be released through the windows 37 and 86 provided in the 71,
In addition to facilitating the work, the connection terminals 2, 6 can be removed from the housings 3, 7 without damaging the housings 3, 7 and the connection terminals 2, 6 with the jigs 51, 51 '. In addition, since the states of the connection terminals 2 and 6 inserted into the housings 3 and 7 can be visually recognized from the windows 37 and 85, errors in inserting the connection terminals 2 and 6 can be prevented.

Although the first and second embodiments have described the arrangement of the connection terminals 2 and 6 in two stages, it is needless to say that the present invention can be applied to the case of one stage. When the connection terminals 2 and 6 are arranged in three or more stages, a window portion communicating with the window portions 37 and 86 is formed in the partition walls 26 and 75 separating the upper and lower portions, and after the upper and lower connection terminals 2 and 6 are pulled out. , Jig 5
1, 51 'can be passed through those windows to release the locking of the connecting terminals 2, 6 and the locking arms 45, 95.

[0036]

As described above, in the electrical connector according to the present invention, since the rear holder is substantially plate-shaped, it can be formed by a simple two-layered mold, and the locking arm can be easily manufactured. Further, if the width of the locking arm is set to be close to the width of the terminal receiving hole, the width of the locking arm can be made larger than that of the conventional one, and the locking force of the locking arm can be improved.

In the electrical connector according to the present invention, since the window is provided on the outer wall of the housing, the jig can be passed through the window to release the engagement between the connection terminal and the rear holder. Therefore, the jig is inserted from the opening of the mating connection terminal of the housing,
There is no need to insert from the rear of the housing,
Damage to the housing and the connection terminals can be prevented.

[Brief description of the drawings]

FIG. 1 is an assembled sectional perspective view of a first embodiment.

FIG. 2 is an exploded cross-sectional perspective view excluding connection terminals.

FIG. 3 is an exploded vertical sectional view corresponding to FIG. 2;

FIG. 4 is a longitudinal sectional view in which a rear holder is engaged with a temporary engagement position.

FIG. 5 is a longitudinal sectional view in which a connection terminal is inserted into a housing.

FIG. 6 is a longitudinal sectional view in which a rear holder is pushed into a full engagement position.

FIG. 7 is an operation explanatory view in which insertion of a connection terminal is stopped halfway.

FIG. 8 is an operation explanatory diagram of pushing the rear holder in the state of FIG. 7;

FIG. 9 is an operation explanatory view in which a connection terminal is inserted upside down.

FIG. 10 is an operation explanatory view in which a connection terminal is inserted upside down.

FIG. 11 is an operation explanatory view for releasing a locked state between the connection terminal and the rear holder.

FIG. 12 is an assembled sectional perspective view of the second embodiment.

FIG. 13 is an exploded cross-sectional perspective view excluding connection terminals.

FIG. 14 is an exploded vertical sectional view in which a rear holder is engaged with a temporary engagement position.

FIG. 15 is a longitudinal sectional view in which a connection terminal is inserted into a housing.

FIG. 16 is an operation explanatory view in which insertion of a connection terminal is stopped halfway.

FIG. 17 is an operation explanatory view in which a connection terminal is inserted upside down.

FIG. 18 is an explanatory diagram of an operation of releasing a locked state between the connection terminal and the rear holder.

FIG. 19 is a partial longitudinal sectional view of a conventional example.

FIG. 20 is an exploded sectional perspective view of a conventional example.

[Explanation of symbols]

 1, 5 Electric wire 2, 6 Connection terminal 3, 7 Housing 4, 8 Rear holder 11, 61 Terminal body 15, 66 Stabilizer 16, 36 Lock hole 21, 71 Outer wall 23, 73 Front end surface 24, 74 Rear end surface 28, 77 Terminal accommodating holes 29, 78 Gap 36 Locking holes 37, 86 Windows 38, 87 Restriction walls 38a, 87a Vertical walls 38b, 87b Horizontal portions 41, 91 Holder bodies 42, 92 Locking protrusions 45, 95 Locking arms 51, 51 'Removal jig 85 Lock groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshikazu Tanaka 1-8-1, Kotakecho, Nerima-ku, Tokyo Ryosei Denso Co., Ltd. (72) Inventor Ryo Sawada 8-1-1 Kotakemachi, Nerima-ku, Tokyo No. Ryosei Denso Co., Ltd.

Claims (11)

[Claims] A housing for accommodating one or more connection terminals connected to a cable; a rear holder engaging a rear portion of the housing to hold the connection terminals so as not to come out of the housing; An electrical connector comprising an engaging means for engaging the rear holder, wherein the rear holder has a substantially plate-like shape, and a main body which enters a gap of the housing and is engaged with the housing via the engaging means. And an engaging arm provided at a distal end of the main body to enter each terminal accommodating hole of the housing to engage the connection terminal. 2. The electrical connector according to claim 1, wherein the locking arm has a width slightly narrower than the terminal receiving hole. A first engagement position in which the rear holder is inserted into the housing to an intermediate position;
2. The electrical connector according to claim 1, wherein the electrical connector can be engaged with the second engagement position where the connector is sufficiently pushed in. 4. The electrical connector according to claim 3, wherein the connection terminal is inserted into the housing when the housing and the rear holder are at the first engagement position. 5. The electrical connector according to claim 1, wherein windows are provided on upper and lower walls of the housing near the connection terminal and the locking portion of the locking arm to communicate the outside with the terminal receiving hole. 6. The electrical connector according to claim 1, wherein said housing has a regulating wall for regulating movement of said locking arm. 7. The electrical connector according to claim 6, wherein the restricting wall has a portion that abuts against an outer surface of the non-deflectable locking arm to restrict outward bending. 8. The electrical connector according to claim 6, wherein the restricting wall has a portion that abuts against a front surface of the bent locking arm and restricts forward movement thereof. 9. The electrical connector according to claim 1, wherein when the connection terminal is inserted upside down, a vertically asymmetric portion of the connection terminal contacts a part of the housing. 10. A housing for accommodating one or more connection terminals connected to a cable, a rear holder engaged with a rear portion of the housing to hold the connection terminals so as not to come out of the housing, An electrical connector comprising an engaging means for engaging a rear holder, wherein the rear holder enters a gap of the housing and is engaged with the housing via the engaging means, and is provided at a tip of the main body. A locking arm that enters each terminal accommodating hole of the housing to lock the connection terminal, and is provided on upper and lower walls of the housing in the vicinity of a locking portion of the connection terminal and the locking arm. An electrical connector provided with a window communicating the terminal with the terminal receiving hole. 11. The electrical connector according to claim 10, wherein the locking state of the locking arm and the connection terminal is released via the window.