JP2013079624A - Flywheel housing, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flywheel housing and a method of manufacturing the same, capable of restraining a die investment more than a conventional die investment.SOLUTION: This flywheel housing 11 includes individually dividedly constituted timing gear case 12 and flywheel housing body 13, and is constituted so that a plurality of kinds of flywheel housing bodies 13 can be attached and detached with the timing gear case 12 as a core module.

Description

  The present invention relates to a flywheel housing and a manufacturing method thereof.

  FIG. 4 schematically shows an example of an engine mounted on a commercial vehicle such as a truck. On the rear surface side of the cylinder block 2 of the engine 1, a fly mounted on the rear end of the crankshaft 3 of the engine 1 is shown. A flywheel housing 5 is attached so that the wheel 4 can be encapsulated. As in the example shown here, a timing gear 6 (explained in FIG. 4) is provided on the rear surface of the cylinder block 2 of the engine 1. For the sake of convenience, only one is shown, but a gear train is actually constituted by a plurality of gears). In this case, the timing gear 6 is disposed on the front side of the flywheel housing 5. A timing gear case 7 is integrally formed so as to define a housing space.

  That is, the auxiliary parts such as the fuel pump and the valve system equipped in the engine 1 are driven by the torque of the crankshaft 3 being transmitted, but in commercial vehicles where durability is important. The torque transmission by the timing gear 6 is performed instead of the timing belt.

  Although there is an example in which this type of timing gear 6 is mounted on the front surface of the cylinder block 2, when the timing gear 6 is disposed on the rear surface of the cylinder block 2, the timing gear case 7 as described above can be used. A measure is taken to integrally form the timing gear case 7 on the front surface side. In the flywheel housing 5 that is integrally provided with the timing gear case 7 as described above, an oil seal is applied to the penetrating portion of the crankshaft 3 to thereby provide the timing gear case 7. Only the side has a lubrication environment.

  A specific configuration of the flywheel housing 5 is as shown in FIG. 5, and includes a timing gear case 7 that encloses the timing gear 6 on the rear surface of the cylinder block 2 and a flywheel housing body 8 that encloses the flywheel 4. It is integrally formed by casting to form a single part flywheel housing 5.

  The prior art document information related to this type of flywheel housing 5 includes the following Patent Document 1 and the like.

JP 2003-254413 A

  However, in the conventional design concept of the flywheel housing 5, the timing gear case 7 and the flywheel housing body 8 are integrated by casting based on the design concept of realizing cost reduction by increasing the number of functions of parts. The specifications on the transmission 10 side assembled with the clutch 9 behind the engine 1 (for example, clutch size, manual and automatic, truck and bus, domestic and overseas standards, etc.) In line with the difference, the entire structure including the timing gear case 7, which is irrelevant to the transmission 10 side, had to be newly installed, and a large amount of expensive casting molds were required, so that the investment in the mold was soaring.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flywheel housing and a method for manufacturing the flywheel housing that can suppress mold investment more than ever.

  The present invention includes a timing gear case and a flywheel housing body that are individually divided and configured so that a plurality of types of flywheel housing bodies can be attached and detached using the timing gear case as a core module. The housing.

  Further, according to the present invention, the flywheel housing is divided into a timing gear case and a flywheel housing main body, and the divided timing gear case is used as a core module to meet the specifications on the transmission side among a plurality of types of flywheel housing main bodies. The present invention also relates to a flywheel housing manufacturing method, wherein a flywheel housing body is selected, and the selected flywheel housing body is assembled to the timing gear case to form a flywheel housing.

  Thus, if such a flywheel housing and its manufacturing method are adopted, the same timing gear case can be commonly used as a core module regardless of the specifications on the transmission side, and the flywheel is adapted to the specifications on the transmission side. Since only the housing main body side needs to be classified, it is only necessary to newly create a casting mold only for the flywheel housing body excluding the timing gear case. Will be greatly suppressed.

  Previously, the transmission side specifications were confirmed, and the flywheel housing, which was integrally cast, was assembled and managed as multiple types of engines, increasing the number of man-hours for engine management and supplying the engine to the market. However, it takes a long time to complete the process from the stage when the transmission specifications are not yet decided to the state where the timing gear case is assembled and manage it as one type of engine. The engine supply time will be greatly reduced.

  According to the above-described flywheel housing of the present invention and the manufacturing method thereof, various excellent effects as described below can be obtained.

  (I) Since the same timing gear case can be used as a core module regardless of the transmission side specifications, only the casting mold on the flywheel housing body side can be newly raised according to the transmission side specifications. This reduces the mold investment in the timing gear case, greatly reducing the mold investment on the flywheel housing, and the total required to manufacture the flywheel housing to meet various specifications on the transmission side. Cost can be greatly reduced.

  (II) It is possible to complete the process from the stage where the transmission side specifications are not yet decided to the state where the timing gear case is assembled and manage it as one type of engine, so check the transmission side specifications as before Compared to the situation where a single-piece flywheel housing is assembled and managed as multiple types of engines, the engine management man-hours can be significantly reduced, and the engine supply time to the market is greatly increased. It can be shortened.

It is a perspective view which shows an example of the form which implements this invention. It is a perspective view which shows another example of the flywheel housing main body of FIG. It is a perspective view which shows another example of the flywheel housing main body of FIG. It is the schematic which shows an example of the engine mounted in commercial vehicles, such as a truck. It is a perspective view which shows an example of the conventional flywheel housing.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of an embodiment of the present invention. Among terms used in the description, those not denoted in FIG. 1 are referred to FIG.

  As shown in FIG. 1, in this embodiment, the flywheel housing 11 is divided into a timing gear case 12 and a flywheel housing body 13, and each is manufactured individually as a cast part. As a core module, a plurality of types of flywheel housing bodies 13 can be attached and detached.

  For example, as shown in FIG. 2, a flywheel housing main body 13 corresponding to the clutch 9 (see FIG. 4) having different outer diameters can be attached to and detached from the same timing gear case 12, and As shown in FIG. 3, a flywheel housing body 13 that also serves as a casing of an electric motor for a hybrid vehicle can be attached to and detached from the same timing gear case 12.

  In short, these three types of flywheel housing main bodies 13 have the same fastening position on the front end side with respect to the timing gear case 12 even if their main parts are different in size and shape. It can be concluded with.

  Here, a flywheel housing main body 13 corresponding to the clutch 9 (see FIG. 4) having different outer diameters and a flywheel housing main body 13 that also serves as a casing of an electric motor for a hybrid vehicle are illustrated. However, it is needless to say that the flywheel housing main body 13 with various standards can be attached and detached without being limited thereto.

  When actually manufacturing the flywheel housing 11 adopting such a structure, the timing gear case 12 is used as a core module, and the specifications on the transmission 10 (see FIG. 4) side among the plurality of types of flywheel housing bodies 13 are used. The flywheel housing main body 13 suitable for the above-mentioned is selected, and the selected flywheel housing main body 13 is assembled to the timing gear case 12 to form the flywheel housing 11.

  Thus, the same timing gear case 12 can be commonly used as a core module regardless of the specifications on the transmission 10 (see FIG. 4) side, and the transmission 10 (see FIG. 4) side specifications can be used. In addition, since only the flywheel housing main body 13 side needs to be classified, only the casting mold for the flywheel housing main body 13 excluding the timing gear case 12 can be newly generated, and the investment for the timing gear case 12 can be reduced. Therefore, the mold investment for the flywheel housing 11 is greatly suppressed.

  In the past, the specifications of the transmission 10 (see FIG. 4) were confirmed, and the flywheel housing 11 of an integrally cast product was assembled and managed as a plurality of types of engines 1 (see FIG. 4). Management man-hours (see Fig. 4) increased, and it took time to supply the engine 1 (see Fig. 4) to the market, but from the stage where the specifications on the transmission 10 (see Fig. 4) side have not yet been decided. Since the timing gear case 12 can be completed and managed as one type of engine 1 (see FIG. 4), the man-hours for managing the engine 1 (see FIG. 4) are significantly reduced, and the engine 1 (see FIG. The supply time of 4) is also greatly reduced.

  Therefore, according to the above embodiment, the same timing gear case 12 can be commonly used as the core module regardless of the specifications on the transmission 10 (see FIG. 4) side. Only the casting mold on the flywheel housing main body 13 side can be newly raised to cope with this, thereby reducing the mold investment of the timing gear case 12 and greatly suppressing the mold investment on the flywheel housing 11. The total cost required to manufacture the flywheel housing 11 according to various specifications on the transmission 10 (see FIG. 4) side can be greatly reduced.

  In addition, since the specification on the transmission 10 (see FIG. 4) side has not yet been determined, the timing gear case 12 can be completed and managed as one type of engine 1 (see FIG. 4). Compared to the situation in which the specification of the transmission 10 (see FIG. 4) side is confirmed and the flywheel housing 11 of an integrally cast product is assembled and managed as a plurality of types of engines 1 (see FIG. 4). The management man-hours for the engine 1 (see FIG. 4) can be significantly reduced, and the supply time of the engine 1 (see FIG. 4) to the market can be greatly shortened.

  It should be noted that the flywheel housing and the manufacturing method thereof according to the present invention are not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

1 Engine 10 Transmission 11 Flywheel Housing 12 Timing Gear Case 13 Flywheel Housing Body

Claims (2)

  A flywheel housing comprising a timing gear case and a flywheel housing body that are individually divided and configured so that a plurality of types of flywheel housing bodies can be attached and detached using the timing gear case as a core module.   The flywheel housing is divided into a timing gear case and a flywheel housing body, and the divided timing gear case is used as a core module, and a flywheel housing body that meets the transmission specifications is selected from multiple types of flywheel housing bodies. A flywheel housing manufacturing method, wherein the selected flywheel housing body is assembled to the timing gear case to form a flywheel housing.

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