JP5546497B2 - Connector mounting structure - Google Patents

Description

  The present invention relates to a connector mounting structure for connecting electrical wiring inside and outside a transmission case in a vehicle transmission.

Solenoids and various sensors arranged in the transmission case for transmission mechanism control are connected to a control unit outside the transmission case through wiring. Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 2003-262265, the wiring is connected to the internal cable and the transmission in the transmission case so that oil leakage does not occur at a place where the wiring passes through the case wall of the transmission case. The external cable is divided into an external cable outside the case, and the internal cable and the external cable are connected via a connector attached to the transmission case.
The connector is attached by being inserted into a through hole formed in the transmission case with a basic shape of a cylindrical shape. A ring groove is formed in a portion corresponding to the through hole on the outer periphery of the connector, and an O-ring is disposed in the ring groove to block the inside and outside of the transmission case in an oil-tight manner.

JP 2003-262265 A

However, since the O-ring is normally set at an axially intermediate position of the cylindrical seal surface in the through hole, mist, water, etc. are likely to accumulate on the outside of the case from the O-ring contact portion on the seal surface, which adversely affects the seal performance. There is a risk.
Further, since the connector main body is a molded product made of resin, if there is a thick portion in the cross section, sink marks occur during molding, and an accurate product shape as designed cannot be obtained.

As a countermeasure, generally, as shown in FIG. 5, the outer peripheral surface of the connector 60 is provided with a number of partial lightening portions 62 a and 62 c including a lightening portion 62 b adjacent to the ring groove 18. Since the mist, water and the like are likely to be collected in the thinned portion, a misleading phenomenon such as misidentification as oil leakage from the through hole 3 particularly when the mist or water is accumulated in the thinned portion 62b near the opening of the through hole 3. May also occur. 5A is an external perspective view of the connector 60, and FIG. 5B is a cross-sectional view thereof.
Furthermore, when the connector 60 is assembled without being centered with respect to the through hole 3, the O-ring 52 of the connector 60 may be torn, which also adversely affects the sealing performance.
In FIG. 5, 1 is a transmission case, 50 is a terminal pin of the connector 60, Ci is an internal cable, 9 is a connector of an internal cable connected to the connector 60, and an external cable and its connector are omitted.

  Therefore, in view of the above problems, the present invention ensures the sealing performance at the connector mounting portion to the transmission case and prevents the connector from being attached with mist, water, or the like that may be mistaken for oil leakage. An object is to provide a connector mounting structure.

Therefore the present invention is a mounting structure of a connector for connecting a transmission case and out of the cable, the connector has an insertion portion to be inserted from the inside into a through hole formed in the transmission case, comprising a Shiruri ring that seals between the first ring groove in a through hole formed on the outer periphery of the insertion passage part, a part in the first ring groove from the inserting direction front end side of the insertion portion is located outside the through-hole and an elastic ring to a second ring groove which is set as the elastic ring, together are fitted with the same width to the groove width of the second-ring groove, than the outside diameter of the outer diameter of the insertion portion The connector mounting structure is characterized by its large size.

According to the present invention, since the elastic ring is located in the vicinity of the seal ring, it is difficult for mist, water, and the like to accumulate, and thus adverse effects on the seal performance of the seal ring are prevented.
When the connector is attached to the transmission case, the elastic ring enters the through hole and is centered before the seal ring, so that there is no possibility that the seal ring is broken.

It is a figure which shows the connector in embodiment of this invention. It is sectional drawing which shows the through-hole of a transmission case. It is an expanded sectional view of the ring groove part by which an O-ring and a square ring are arrange | positioned. It is sectional drawing which shows the state which attached the connector to the through-hole of the transmission case. It is a figure which shows a prior art example.

Next, an embodiment of the present invention will be described.
1A and 1B show a connector according to an embodiment, wherein FIG. 1A is an external perspective view, and FIG. 1B is a cross-sectional view. FIG. 2 is a sectional view showing a through hole of a transmission case to which a connector is attached.
The connector 10 attached to the transmission case includes a resin main body 11 and a copper alloy terminal pin 50.
The main body 11 of the connector 10 has a cylindrical shape. In particular, as shown in FIG. 1, as shown in FIG. A connector receptacle 13 and a lower internal connector receptacle 14 for receiving the connector 9 (see FIG. 4) of the internal cable Ci are provided. The terminal pin 50 is molded integrally with the partition wall 12, extends through the partition wall 12 in the axial direction, and faces the external connector receptacle 13 and the internal connector receptacle 14.
That is, the external connector receptacle 13 becomes an external connection portion connected to the external connector (connector 7), and the internal connector receptacle 14 becomes an internal connection portion connected to the internal connector (connector 9).

The external shape of the main body 11 includes an insertion portion 15 inserted into the through hole 3 of the transmission case 1, a base portion 17 having a diameter larger than the insertion portion 15 and extending downward, and an inclined portion 16 connecting the insertion portion 15 and the base portion 17. It is made up of.
The base portion 17 is shorter than the insertion portion 15, and a two-surface width portion 26 is notched on the outer peripheral surface of the lower end portion, and a step portion 27 is formed between the upper portion side.
A grip portion 28 and a fastener engaging portion 30 are further provided on the side wall (outer periphery) of the base portion 17. The grip portion 28 is positioned above the two-surface width portion 26 so as to correspond to one of the two-surface width portions 26 in the circumferential direction and have the lower end coincide with the step portion 27. The grip portion 28 is formed with an axial hole 29 that opens to the lower end (step portion 27).
The fastener engaging portion 30 engages with a fastener (not shown) provided on the connector 9 of the internal cable Ci to prevent the connector 9 from coming off.

A ring groove 18 is formed near the base portion 17 in the insertion portion 15, and a sealing O-ring 52 is fitted into the ring groove 18. The width of the ring groove 18 has a margin with respect to the cross-sectional diameter d (see FIG. 3) of the O-ring 52, and the O-ring 52 can be slightly displaced in the axial direction within the width of the ring groove 18.
Further, in the insertion portion 15, a ring groove 20 is formed adjacent to the upper side (the distal end side of the insertion portion 15) of the ring groove 18 for the O ring 52, instead of the lightening portion, and a square ring 54 described later is formed. The ring groove 20 is fitted.

As shown in the enlarged sectional view of FIG. 3, the square ring 54 is fitted with the same width as the groove width of the ring groove 20, and the circumferential surface s of the ring outer diameter is a straight line parallel to the outer circumferential surface of the insertion portion 15 in the axial direction. On the other hand, the circumferential surface on the inner diameter side of the ring is a circular arc in cross section. The corners at both axial ends of the peripheral surface of the ring outer diameter are smoothly chamfered.
The O-ring 52 fitted into the ring groove 18 has a part on the outer diameter side of the ring protruding from the outer peripheral surface f of the insertion portion 15 in a free state, and the angular ring 54 fitted into the ring groove 20 also has a peripheral surface s. When protruding from the outer peripheral surface f of the insertion portion 15 and being inserted through the through hole 3, both are compressed in the ring radial direction. The protruding amount of the O-ring 52 is larger than the protruding amount of the square ring 54.

Returning to FIG. 1, a confirmation groove 22 for confirming the insertion position is further formed on the upper side of the ring groove 20, and a connector cap 8 (see FIG. 5) between the confirmation groove 22 and the upper end (tip) of the insertion portion 15. 4) is formed in a spiral shape.
Further, a circumferential positioning mark 32 when the connector 7 of the external cable Co is inserted into the external connector receptacle 13 is provided on the outer peripheral surface of the insertion portion 15.
As shown in FIG. 2, the through hole 3 is formed in a cylindrical connector mounting portion 2 extending a predetermined amount downward (inward) from the inner surface of the transmission case 1, and axially extends from the outer end of the transmission case outer surface side. An inner wall in a certain range is a sealing surface 4, and an inclined surface 5 (conical surface) is widened from the sealing surface 4 to the inner end.

FIG. 4 shows a cross section in a state where the connector 10 is attached to the through hole 3 of the transmission case 1.
The connector 10 is attached to the through hole 3 by inserting the insertion portion 15 of the main body 11 from the inside of the transmission case 1. At this time, if the positioning mark 32 is also used as an insertion mark of the insertion portion 15 to be opposed to the index formed on the transmission case 1, the circumferential position can be easily adjusted to a preset direction.
In the insertion, the square ring 54 enters the through-hole 3 before the O-ring 52, whereby the insertion portion 15 of the connector 10 is centered with respect to the through-hole 3. When entering 3, the O-ring 52 is not caught by a hole edge or the like and is not torn.

When the insertion portion 15 is inserted until the confirmation groove 22 is located outside the through hole 3, the O-ring 52 comes into contact with the seal surface 4 of the through hole 3, thereby shutting off the inside and outside of the transmission case 1 in an oil-tight manner. Will be.
On the other hand, the ring groove 20 thereof (indicated by g in FIG. 3) the upper side wall is position to so that setting the opening surface near the through-hole 3 in the transmission case 1. As a result, at least a part of the peripheral surface s of the square ring 54 fitted in the ring groove 20 comes into contact with the seal surface 4 and performs the sealing function in the same manner as the O-ring 52.
The inclined surface 5 of the through hole 3 functions as a stopper that contacts and regulates the inclined portion 16 of the connector 10 when the insertion portion 15 of the connector 10 goes out of the allowable range.

The internal cable Ci may be inserted into the internal connector receptacle 14 after the connector 9 is inserted into the through hole 3 of the connector 10 or the connector 10 is inserted into the through hole 3 with the connector 9 connected. Also good.
Next, a control valve unit (not shown) is attached to the transmission case 1 in a state where the connector 10 is inserted into the through hole 3 and held in the transmission case 1 and the connector 9 of the internal cable Ci is also connected.

The control valve unit is attached below the portion of the transmission case 1 where the through hole 3 is formed, and a holder 40 corresponding to the two-surface width portion 26 and the grip portion 28 of the connector 10 (main body 11) is attached in advance.
The holder 40 includes a frame wall 41 that sandwiches the two-surface width portion 26 of the connector 10 in a state where the control valve unit is attached to the transmission case 1, and the upper edge of the frame wall 41 contacts the stepped portion 27 of the connector 10. It is set to face each other with a slight contact or a slight gap. Furthermore, an arm 43 that engages with the hole 29 of the grip portion 28 of the connector 10 extends upward from the upper edge of one frame wall 41.

Therefore, by attaching the control valve unit to the transmission case 1, the frame wall 41 facing the stepped portion 27 prevents the connector 10 from coming out into the transmission case 1 and enters the hole 29 of the grip portion 28. Thus, the engaging arm 43 regulates the rotation of the connector 10, and the connector 10 is fixed to the transmission case 1.
The outer diameter of the insertion portion 15 of the connector 10 and the seal surface 4 of the through-hole 3 have a predetermined gap as long as the sealing function by the O-ring 52 is ensured as well as the sliding contact relationship. Also good.

  As shown by phantom lines in FIG. 4, the connector 7 of the external cable Co with a connector cap is inserted into the external connector receptacle 13 of the connector 10 fixed to the transmission case 1 and connected to the terminal pin 50. The cap 8 is put on the insertion portion 15 and tightened along the screw groove 24 to prevent the connector 7 from coming off. Thereby, the connection between the external cable Co and the internal cable Ci is completed.

  In the present embodiment, the ring groove 18 corresponds to the first ring groove in the invention, and the ring groove 20 corresponds to the second ring groove. The O-ring 52 corresponds to a seal ring, and the square ring 54 corresponds to an elastic ring.

The embodiment is configured as described above, and a connector 10 for connecting cables inside and outside the transmission case has an insertion portion 15 inserted from the inside into a through hole 3 formed in the transmission case 1, O comprises a ring 52, located in the part is a through hole 3 a further annular groove 18 from the inserting direction front end side of the insertion portion 15 to seal between the through-hole 3 in a ring groove 18 formed on the outer periphery of the insertion passage part It is assumed that the ring groove 20 set so as to include a square ring 54. For this reason, the square ring 54 is positioned in the vicinity of the O-ring 52 where mist, water and the like have been easily accumulated in the prior art, and it is difficult for mist and water to accumulate, so that the sealing performance of the O-ring 52 is prevented from being adversely affected. Is done.
Further, when the connector 10 is attached to the transmission case 1, the square ring 54 enters the through-hole 3 and is centered before the O-ring 52, so that the O-ring 52 is caught by the entrance of the through-hole 3 and is torn. There is no risk of doing so .

Since the ring outer diameter of the square ring 54 is larger than the outer peripheral diameter of the insertion portion 15, infiltration of mist, water, or the like in the direction of the O-ring 52 is particularly effectively prevented .
Further, since the square ring 54 is fitted into the groove width of the ring groove 20 with the same width, there is no room for mist and water to accumulate in the ring groove 20 itself. And the square ring 54 looks like a part of the outer peripheral surface of the insertion part 15, and the mist, water, etc. which are mistaken for an oil leak do not appear on the peripheral surface of the angular ring 54 .
Further, the angular ring 54 is set so that the outer peripheral surface of the ring forms a cylindrical surface and the outer side wall (g) of the ring groove 20 is aligned with the outer opening surface of the through hole 3. Even when the position of the connector is slightly shifted outward due to a dimensional variation due to an error in the through hole 3 of the main body 11 or the transmission case 1, the contact of the through hole 3 with the seal surface 4 does not occur even when the square ring 54 protrudes from the through hole 3. Secure and maintain a stable sealing effect .

In the embodiment, the external connector receptacle 13 of the connector connected to the external cable as the external connection portion is a male type in which the terminal pin 50 protrudes from the internal partition wall 12, and the internal connector is connected to the internal cable as the internal connection portion. The receiving port 14 is also a male type in which the terminal pin 50 protrudes from the partition wall 12, but the male and female selections of the external connection part and the internal connection part are arbitrary, and each male is corresponding to the type of connector of the external cable and the internal cable. What is necessary is just to comprise a type or a female type.
The elastic ring is most preferably a square ring 54 having a cylindrical outer surface of the outer diameter of the ring, but is not limited to this, and the same cross-sectional shape as the O-ring 52 or other cross-sectional shapes depending on conditions. Can be adopted.
Further, the connector 10 is prevented from being detached from the mounting position and positioned in the rotational direction by the engagement with the holder 40 attached to the control valve unit. However, the connector is directly connected with a bolt or the like, or the bracket is attached. It may be indirectly connected to the transmission case to prevent it from coming off.

DESCRIPTION OF SYMBOLS 1 Transmission case 2 Connector attachment part 3 Through-hole 4 Seal surface 5 Inclined surface 8 Connector cap 9 Connector 10 Connector 11 Main body 12 Bulkhead 13 External connector receptacle 14 Internal connector receptacle 15 Insertion part 16 Inclination part 17 Base part 18 Ring groove ( 1st ring groove)
20 Ring groove (second ring groove)
22 Confirmation groove 24 Screw groove 26 Two-surface width portion 27 Step portion 28 Grip portion 29 Hole 30 Fastener engaging portion 32 Positioning mark 40 Holder 41 Frame wall 43 Arm 50 Terminal pin 52 O-ring (seal ring)
54 Square ring (elastic ring)
Co External cable Ci Internal cable

Claims (1)

A connector mounting structure for connecting cables inside and outside the transmission case,
The connector has an insertion portion that is inserted from the inside into a through hole formed in the transmission case,
A first ring groove formed on the outer periphery of the insertion portion is provided with a seal ring that seals between the through hole;
An elastic ring is provided in the second ring groove that is set so that a part of the insertion part is located outside the through hole on the distal side in the insertion direction from the first ring groove in the insertion part;
The elastic ring is fitted into the groove width of the second ring groove with the same width, and the outer diameter thereof is larger than the outer peripheral diameter of the insertion portion.

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