JP2012149622A - Heat insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a component, such as a protective member, which covers a wire harness from interfering, caused by vibration during traveling of a vehicle.SOLUTION: A clamp, which sandwiches the wire harness routed on an outer surface of a transmission case and a position of a protector covering part of the wire harness, is disposed on the a surface of the transmission case side of a heat insulator 30. Accordingly, the heat insulator 30 is fixed integrally with the wire harness and the protector. As a result, the heat insulator 30 is prevented from interfering with the component, such as the protector, which covers the wire harness by vibrating during the traveling of the vehicle.

Description

  The present invention relates to a heat insulator, and more specifically, is used in a vehicle on which an internal combustion engine and a transmission are mounted so that a muffler attached to an exhaust pipe of the internal combustion engine and a part of a housing for housing the transmission are close to each other. A plate-like heat that is arranged on the outer surface of the housing and is arranged between the wire harness and the muffler partially covered with a protective member, and assembled to the housing using bolts at multiple locations Related to insulators.

  Conventionally, as a technology related to this type of heat insulator, first and second drive shafts are respectively provided on both sides of a differential gear that transmits power from a horizontally mounted engine to left and right front wheels. In a front-wheel drive vehicle in which an exhaust pipe of the engine is disposed in the vicinity of a support portion that rotatably supports the cylinder block of the engine, a heat shield is provided to block heat radiation from the engine and the exhaust pipe to the support portion The thing is proposed (for example, refer patent document 1). In this vehicle, the heat radiation to the support portion is thus blocked, thereby preventing the temperature deterioration of the grease sealed in the bearing of the support portion. The heat shield is attached to the engine cylinder block using a plurality of bolts.

Japanese Utility Model Publication No. 62-68819

  In a rear-wheel drive vehicle in which the muffler attached to the engine exhaust pipe and a part of the transmission case are close to each other, the wire harness routed on the outer surface of the transmission case on the muffler side The heat insulator may be assembled with bolts at multiple locations on the transmission case so that it does not overheat due to heat dissipation, but the assembled heat insulator vibrates when the vehicle travels and protects the wire harness There was a case to interfere with.

  The main object of the heat insulator of the present invention is to suppress interference with components such as a protective member that covers the wire harness due to vibration during traveling of the vehicle.

  The heat insulator of the present invention employs the following means in order to achieve the main object described above.

The heat insulator of the present invention is
The muffler attached to the exhaust pipe of the internal combustion engine is used in a vehicle on which the internal combustion engine and the transmission are mounted so that a part of the housing that houses the transmission is in close proximity. In a plate-like heat insulator that is arranged between a wire harness that is wired on the surface and partially covered by a protective member and the muffler, and is assembled to the housing using bolts at a plurality of locations. ,
One or more clamp portions that sandwich at least one or more portions of the wire harness and the protection member are provided on the surface of the heat insulator on the housing side.
It is characterized by that.

  In the heat insulator according to the present invention, at least one portion of the wire harness routed on the outer surface of the housing and a protective member covering a part of the wire harness on the surface of the heat insulator on the housing side One or more clamp portions are provided to sandwich the. Thereby, a heat insulator can be fixed integrally with a wire harness and a protection member. As a result, it is possible to suppress the heat insulator from vibrating when the vehicle travels and interfering with components such as a protective member that covers the wire harness. In addition, since it is possible to attach the heat insulator to the wire harness or the protective member by the clamp portion before assembling the housing with the bolt, workability when assembling the heat insulator to the housing with the bolt. Can be improved.

It is explanatory drawing which shows typically the mode of arrangement | positioning of the transmission case 20 and the muffler 10 with which the heat insulator 30 as one Example of this invention is assembled | attached. It is an external view which shows the external appearance of the heat insulator 30 of an Example. It is sectional drawing which shows the AA cross section of the heat insulator 30 of FIG. It is explanatory drawing which shows an example of the site | part pinched by the some clamp part 34 among the wire harness 22 and the protector 24. FIG. It is explanatory drawing which shows an example of the magnitude | size of the displacement amount by the vibration of the heat insulator 30B of a modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is an explanatory view schematically showing a state in which a transmission case 20 to which a heat insulator 30 as an embodiment of the present invention is assembled and a muffler 10 are arranged, and FIG. 2 is an external view of the heat insulator 30 of the embodiment. FIG. 3 is a cross-sectional view showing an AA cross section of the heat insulator 30 of FIG. In the embodiment, an engine (not shown) as an internal combustion engine having a muffler 10 attached to an exhaust system and a transmission as an automatic transmission housed in a transmission case 20 are mounted on the vehicle. The vehicle travels by shifting the power of the vehicle with a transmission and outputting it to the rear wheels.

  The muffler 10 is a device for reducing the pressure by introducing high-temperature and high-pressure exhaust gas flowing through the exhaust pipe of the engine into the expansion chamber and reducing the exhaust noise by the sound absorbing material. It receives heat from the flowing exhaust gas and gets hot.

  The transmission case 20 houses a plurality of brakes, clutches, planetary gears, and the like that constitute a transmission that is controlled by a torque converter attached to the crankshaft of the engine and an electronic control unit (not shown).

  As shown in FIG. 1, the muffler 10 and the transmission case 20 are arranged close to each other. Further, a wire harness 22 as a signal line for connecting the electronic control unit and the transmission is routed on the outer surface of the transmission case 20 on the muffler 10 side, most of which is generated by heat generated from the muffler 10 and the like. In order to protect, it is covered with a resin protector 24.

  Although not shown in FIG. 1, a heat insulator 30 made of an iron plate as shown in FIG. 2 is arranged between the muffler 10 and the transmission case 20, and the heat insulator 30 includes a plurality of through holes 32. Is assembled to the transmission case 20 by bolting together with the plurality of bolt mounting portions 26 of the transmission case 20. At this time, the heat insulator 30 is assembled so as to cover the wire harness 22 and the protector 24, and the wire harness 22 can be more reliably protected from the heat generated from the muffler 10. 2 shows the surface of the heat insulator 30 on the muffler 10 side.

  Further, on the surface of the heat insulator 30 on the transmission case 20 side, a plurality of clamp portions 34 that sandwich the wire harness 22 and the protector 24 are provided at a plurality of portions indicated by dotted lines in FIG. FIG. 4 shows an example of a portion of the wire harness 22 and the protector 24 that is sandwiched between the plurality of clamp portions 34 by dotted lines. In the embodiment, as can be seen from FIGS. 2 and 4, a total of four portions of the wire harness 22 and the protector 24 are sandwiched by the four clamp portions 34 of the heat insulator 30.

  As shown in FIG. 3, the clamp portion 34 of the heat insulator 30 is composed of two iron plate members fixed by welding or the like substantially vertically from the surface of the heat insulator 30 on the transmission case 20 side. Further, the clamp portion 34 sandwiches a rubber material 36 having heat resistance and heat insulation properties, and the rubber material 36 sandwiches the protector 24, for example, thereby fixing the heat insulator 30 to the wire harness 22 and the protector 24. . At this time, an air layer 38 is secured between the surface of the heat insulator 30 on the transmission case 20 side and the rubber material 36. Thereby, the heat receiving from the muffler 10 of the wire harness 22 can be suppressed more reliably.

  As described above, the heat insulator 30 is not only fixed to the transmission case 20 using the bolts, but is also fixed to the transmission case 20 by the clamp portion 34. Therefore, the heat insulator 30 is fixed integrally with the wire harness 22 and the protector 24. be able to. Thereby, even if the heat insulator 30 vibrates when the vehicle travels, the air layer 38 is secured in the clamp portion 34 and vibrates integrally with the protector 24 and the like, and the heat insulator 30 interferes with components such as the protector 24. Can be suppressed. In the embodiment, the heat insulator 30 is fixed to the wire harness 22 and the protector 24 by the clamp portion 34 before the heat insulator 30 is fixed to the transmission case 20 with bolts. Thereby, when fixing the heat insulator 30 using a volt | bolt, the necessity etc. which support the heat insulator 30 by hand are lost, and workability | operativity can be improved. Of course, it is possible to prevent the wire harness 22 from receiving heat from the muffler 10 by assembling such a heat insulator 30.

  According to the heat insulator 30 of the embodiment described above, the protector that covers the wire harness 22 routed on the outer surface of the transmission case 20 and a part of the wire harness 22 on the surface of the heat insulator 30 on the transmission case 20 side. Since the clamp part 34 which pinches | interposes 24 site | parts is provided, the heat insulator 30 can be fixed integrally with the wire harness 22 and the protector 24. FIG. As a result, it is possible to suppress the heat insulator 30 from vibrating when the vehicle travels and interfering with components such as the protector 24 that covers the wire harness 22.

  In the heat insulator 30 of the embodiment, the plurality of clamp portions 34 are provided so as to sandwich the plurality of portions of the wire harness 22 and the protector 24. However, when the space for providing the clamp portions is limited, the wire harness It is good also as what provides the clamp part which pinches | interposes only one site | part between 22 and the protector 24. FIG. In this case, when a heat insulator without a clamp part is fixed to the transmission case 20 with bolts, a part (maximum displacement amount) that vibrates most during traveling of the vehicle among a plurality of parts that can be provided with the clamp part. A portion having a large diameter can be selected to provide a clamp portion. If it carries out like this, the maximum displacement amount of the vibration which arises in a heat insulator at the time of driving | running | working of a vehicle can be suppressed, and the natural frequency of a heat insulator can be increased more reliably. As a result, it is possible to suppress noise caused by the vibration of the heat insulator when the vehicle is traveling. FIG. 5 shows an example of the magnitude of the displacement due to the vibration of the heat insulator 30B of this modification. In the case of FIG. 5, a clamp portion may be provided on the surface on the transmission case 20 side of a portion with a large amount of displacement (upper left portion in the drawing).

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the muffler 10 corresponds to a “muffler”, the transmission case 20 corresponds to a “casing”, the wire harness 22 corresponds to a “wire harness”, the protector 24 corresponds to a “protective member”, and the clamp The part 34 corresponds to a “clamp part”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the heat insulator manufacturing industry.

  10 muffler, 20 transmission case, 22 wire harness, 24 protector, 26 bolt mounting part, 30, 30B heat insulator, 32 through hole, 34 clamp part, 36 rubber material, 38 air layer.

Claims (1)

The muffler attached to the exhaust pipe of the internal combustion engine is used in a vehicle on which the internal combustion engine and the transmission are mounted so that a part of the housing that houses the transmission is in close proximity. In a plate-like heat insulator that is arranged between a wire harness that is wired on the surface and partially covered by a protective member and the muffler, and is assembled to the housing using bolts at a plurality of locations. ,
One or more clamp portions that sandwich at least one or more portions of the wire harness and the protection member are provided on the surface of the heat insulator on the housing side.
A heat insulator characterized by that.

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