JP7160509B2 - Heat-shielding bracket for mounting internal combustion engine connectors - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shield bracket for attaching a connector for harness connection in an internal combustion engine such as an automobile.

Many sensors are used in an internal combustion engine, and accordingly many harnesses are stretched around the engine body. The harness is typically connected to the sensor via a connector. A connector consists of a movable part to which one end of a harness is connected and a fixed part to which this is connected. In the case where the fixed part is attached to the sensor, the fixed part is connected to the harness (cable) pulled out from the sensor. There are cases where

In any case, the connector is attached to the bracket, but since the connector has a part made of resin and does not necessarily have high heat resistance, it cannot be used for exhaust system parts that become hot such as the exhaust manifold, catalyst case, and exhaust pipe. If the connector is placed nearby, the bracket to which the connector is attached must have a heat shielding function.

Therefore, brackets and the like with a heat shielding structure have been proposed. As an example, Patent Literature 1 discloses that a bracket is provided with a heat shield that blocks heat from an exhaust manifold, and a connector is arranged in a portion of the heat shield that is on the opposite side of the exhaust manifold. On the other hand, Japanese Patent Laid-Open No. 2002-200000 discloses fixing a fixing portion of a connector to a bracket and attaching a heat shielding protector to the connector by a spring-type clip body.

JP 2007-186147 A Microfilm of Japanese Utility Model No. 1-166243

As a means of attaching the connector, it is possible to fix the connector with screws. The bracket is mounted by protruding from the mounting surface of the main body and forcibly inserting the engaging claw into an engaging hole provided in the bracket. That is, a clip-type connecting means is employed.

In Patent Document 1, the main body of the connector is hidden behind the heat shielding part, so that the heat is shielded to some extent. It is difficult to say that it is sufficient as a measure against heat damage.

On the other hand, in Patent Document 2, although the entire connector can be covered with the protector, the clip body of the protector only grips the connector by elastic force. There is a problem that the vibration of the protector spreads to the connector and the connection may be disconnected, or the heat received by the protector is transmitted to the connector, so the heat shielding function of the connector is not necessarily sufficient. is.

The present invention has been made to improve such a situation.

The present invention relates to a heat shielding bracket for attaching a connector located at a location receiving heat from an exhaust system member.
"A mounting part that is overlapped and fixed to the engine body, and a heat shield part that is continuous with the mounting part and is arranged so as to protect the connector from the heat of the exhaust system member,
A first auxiliary bracket to which the connector is attached is fixed to either one of the heat shield portion and the mounting portion so as to be located on the opposite side of the exhaust system member with the heat shield portion interposed therebetween. A second auxiliary bracket that holds the harness connected to the connector is fixed to the mounting portion .
It is configured.

In the present invention, when the heat shield is viewed from the exhaust system member, the entire auxiliary bracket is hidden behind the heat shield. The engaging claw is not exposed to heat (especially radiant heat) emitted from the exhaust system member. Therefore, heat damage can be reliably prevented while maintaining a state in which the connector can be attached in a one-touch manner. Further, it is possible to adopt a configuration in which the connector does not adhere to the heat shield. In this case, it is possible to significantly suppress the connector from receiving heat through the heat shield.

Further, in the present invention, the posture of the harness can be maintained in a state where the harness does not hang down by means of the second auxiliary bracket. Therefore, it is suitable when the harness is arranged in the lower part of the engine room in the internal combustion engine for automobiles.

It is a perspective view which shows the usage condition of embodiment. FIG. 2 shows a bracket according to an embodiment, where (A) is a perspective view, (B) is a BB view of (A), and (C) is a partial view of (B). (A) is a view taken along line IIIA-IIIA of FIG. 2(A), (B) is a view taken along line IIIB-IIIB of FIG. 2(A), and (C) is a sectional view taken along line CC of (B).

Next, embodiments of the present invention will be described based on the drawings. This embodiment is applied to a bracket for an automotive internal combustion engine. In the following description, terms such as front-rear and left-right are used to specify directions. The front-rear direction is the direction of the crank axis, and the left-right direction is the direction perpendicular to the crank axis and the cylinder bore axis. Regarding the front and rear, the side on which the timing chain is arranged is the front, and the side on which the transmission case is arranged is the rear. Just to make sure, the directions are clearly indicated in FIG.

FIG. 1 shows part of an internal combustion engine. In FIG. 1, reference numeral 1 denotes the rear portion of the cylinder block, 2 denotes the rear portion of the oil pan, 3 denotes the transmission case, and 4 denotes the transmission oil tank. 5 is arranged in a vertically longitudinal posture, and an exhaust pipe 8 is connected to the lower end of the catalyst case 5 via joint devices 6 and 7 . The cylinder block 1, the oil pan 2, and the transmission case 3 constitute an engine body described in the claims. In addition, the cylinder head, head cover, and timing chain case (front cover) are also components of the engine body.

The upper and lower joint devices 6 and 7 are provided with spherical fitting type flanges 6a and 7a, and the upper and lower flanges 6a and 7a are connected with bolts 10 via a pair of springs 9. As shown in FIG. The exhaust pipe 8 extends downward from the joint device 7 and bends so as to extend in the horizontal direction, and an O2 sensor (oxygen concentration sensor) 12 is attached to the horizontal portion.

A first harness 13 is connected to the O2 sensor 12 , and a second harness 15 is connected to the first harness 13 via a connector 14 . The connector 14 is composed of a fixed portion 14a and a removable movable portion 14b.

The bracket 16 is made of a metal plate such as a stainless steel plate, and as shown in FIGS. , and a mounting portion 19 integrally continuous with a side edge of the heat shield portion 17 near the mission case 3 via a rear facing wall portion 18 . Therefore, the bracket 16 is bent in a substantially crank shape (stepped shape) in plan view.

A first auxiliary bracket 21 having an L shape in plan view is fixed to the rear surface of the heat shield portion 17 by welding. The first auxiliary bracket 21 is provided with an upright piece 21a that faces rearward and has a wide surface facing in the left-right direction. A fixing portion 14a of the connector 14 is attached.

As shown in FIG. 2B, the fixing portion 14a of the connector 14 is provided with an engaging claw 22 that is elastically deformable, while as shown in FIGS. 2A and 3A, the first auxiliary bracket Engagement holes 23 are formed in the upright pieces 21a of the connector 21. By fitting the engagement claws 22 into the engagement holes 23 against their elasticity, the fixing portions 14a of the connector 14 are fixed to the first auxiliary brackets 21. attached permanently to the

As shown in FIG. 1, the mounting portion 19 of the bracket 16 is fixed to the flange 3a of the transmission case 3 with bolts 24. As shown in FIG. Therefore, the mounting portion 19 is provided with a bolt insertion hole 25 . The mounting portion 19 is fixed with a single bolt 24, but is prevented from turning when the wall portion 18 comes into contact with the outer peripheral surface of the flange 3a of the transmission case 3. As shown in FIG. Therefore, it is held in a predetermined posture by tightening one bolt 24 .

At the lower end of the mounting portion 19 of the bracket 16, an overhanging portion 26 is integrally provided so as to be inclined outward (away from the transmission case 33) as it goes downward. A parallel flat portion 26a is formed, and a second auxiliary bracket 27 having an L shape in side view is fixed to the flat portion 26a by welding.

Since the second auxiliary bracket 27 is L-shaped when viewed from the side, it has a rearward standing piece 27a with its wide side facing up and down. An elongated clip engaging hole 29 is formed for this purpose. The clip 28 includes an engaging claw 28a that fits into the clip engaging hole 29 against elasticity, and a holding portion 28b into which the first harness 13 can be forcibly fitted. In some cases, the holding portion 28b is rotatably attached to the engaging claw 28a.

For example, as shown in FIG. 2, a rearward rib piece 30 is formed by bending so as to be continuous with the lower portion of the inner edge of the mounting portion 19 and the inner edge of the projecting portion 26 . Further, a ridge 31 is formed to bulge so as to straddle the mounting portion 19 and the projecting portion 26 . Furthermore, as shown in FIG. 1, a ridge 32 extending across the mounting portion 19, the wall portion 18, and the heat shield portion 17 is also formed to bulge. By providing the rib piece 30 and the ridges 31 and 32, bending deformation can be prevented and the rigidity can be improved. It should be noted that reference numeral 33 in FIG. 1 denotes a bottom frame that constitutes an engine room.

As can be understood from FIG. 1, the first harness 13 is drawn upward from the O2 sensor 12, and the clip 28 attached to the second auxiliary bracket 27 grasps the middle portion of the harness 13 to bring it into a bent position. The upper end is connected to the fixed portion 14 a of the connector 14 .

As indicated by the dotted arrows in FIG. 2B, heat (radiant heat) is radiated from the upper portions of the catalyst case 5 and the exhaust pipe 8 toward the connector 14, but the connector 14 is not exposed to the heat. This is prevented by the heat shield portion 17 . In this case, since the connector 14 is attached to the first auxiliary bracket 21 , the engaging claws 22 of the connector 14 are also protected from heat by the heat shielding portion 17 . Therefore, the engaging claws 22 are not melted or softened, and the entire connector 14 can be protected from heat damage.

Further, as described above, in the embodiment, the second auxiliary bracket 27 is formed and the clip 28 is attached, so the first harness 13 is held so as not to hang down. Therefore, the first harness 13 does not come into contact with the exhaust pipe 8 or hang down in the engine room, so that the first harness 13 is not damaged during running.

The above embodiments are applied to a heat shield bracket for a connector that connects a harness connected to an O2 sensor. It is widely applicable to mounting brackets for connectors that may be exposed to heat. Therefore, the shape and mounting position of the bracket, and the arrangement position and orientation of the auxiliary bracket may be designed in accordance with the arrangement position of the connector. It is also possible to provide a first auxiliary bracket to which the connector is attached at the mounting portion of the bracket.

INDUSTRIAL APPLICABILITY The present invention can be embodied in a heat shield bracket for attaching a connector of an internal combustion engine. Therefore, it can be used industrially.

1 Cylinder Block 3 Mission Case 5 Catalyst Case 8 Exhaust Pipe 12 O2 Sensor as an Example of Sensor 13 First Harness 14 Connector 14a Fixed Part 14b Movable Part 16 Bracket 17 Heat Shielding Part 18 Wall Part 19 Mounting Part 21 First Auxiliary Bracket
22 Engagement Claw 23 Engagement Hole 24 Fastening Bolt 26 Overhang 27 Second Auxiliary Bracket

Claims (1)

A heat shield bracket for attaching a connector located at a location receiving heat from an exhaust system member,
a mounting portion that is overlapped and fixed to the engine body; and a heat shielding portion that is integrally continuous with the mounting portion and is disposed so as to protect the connector from the heat of the exhaust system member,
A first auxiliary bracket to which the connector is attached is fixed to either one of the heat shield portion and the mounting portion so as to be located on the opposite side of the exhaust system member with the heat shield portion interposed therebetween. A second auxiliary bracket that holds the harness connected to the connector is fixed to the mounting portion .
A heat shield bracket for mounting internal combustion engine connectors.

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