JP4031461B2 - Radiant heat shielding structure for internal combustion engine - Google Patents

Description

  The present invention relates to a radiation heat shielding structure using a cooling water collecting pipe in an internal combustion engine.

  A conventional radiant heat shielding structure of an internal combustion engine is configured as shown in FIG. That is, the cooling water collecting pipe 2, the cooling water connecting pipe 39 and the exhaust manifold M are covered with the exhaust manifold covers 1 and 43. However, in the case of this prior art, since the whole is covered with the exhaust manifold cover 1, the structure of the exhaust manifold cover 1 becomes large. Further, when removing the cylinder head H from the cylinder block B, there is a problem that it is necessary to remove the cooling water collecting pipe 2.

  Further, as shown in FIG. 9, a technique in which an exhaust manifold cover 43 is provided between the cooling water connecting pipe 39 and the exhaust manifold M and only the exhaust manifold M is covered with the exhaust manifold cover 1 has been known. However, in the case of this technique, the height of the cooling water collecting pipe 2 is increased in order to avoid the exhaust manifold cover 1, and a heat shield plate (exhaust manifold) between the exhaust manifold cover 1 and the cooling water collecting pipe 2 is used. The problem that the cover) 43 is necessary has occurred.

Japanese Utility Model Publication No. 57-87140

  The present invention relates to a radiant heat shielding structure for an internal combustion engine that solves the problems occurring in the exhaust manifold cover, the cooling water collecting pipe, the cooling water connecting pipe, and the exhaust manifold as described above.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

In the first aspect, the exhaust manifold cover (1) is arranged on the cylinder head (H) in a structure that shields radiant heat from the exhaust manifold (M) disposed on the side of the cylinder head (H) of the engine. The cooling water collecting pipe (2) to be protruded outward from above the cylinder head (H), and the heat shielding plates (41, 38) are projected from the cooling water collecting pipe (2). (41, 38) and the exhaust manifold cover (1) constitute an exhaust manifold chamber .

According to a second aspect of the present invention, in the radiant heat shielding structure of the internal combustion engine according to the first aspect, along the cooling water collecting pipe (2) disposed outside the upper side of the cylinder head (H), the outer side of the exhaust malhold chamber is provided. And electric wiring (37) necessary for the engine .

Since the present invention is configured as described above, the following effects can be obtained.
According to a first aspect of the present invention, the exhaust manifold cover (1) shields radiant heat from the exhaust manifold (M) disposed on the side of the cylinder head (H) of the engine, and is disposed on the cylinder head (H). The cooling water collecting pipe (2) to be protruded outward from above the cylinder head (H), and the heat shielding plates (41, 38) are projected from the cooling water collecting pipe (2). (41, 38) and the exhaust manifold cover (1) constitute the exhaust manifold chamber. Therefore, the cooling water collecting pipe 2 itself can be used as a part of the exhaust manifold chamber. There is no need to provide it, and the structure is simplified.

  Further, the cylinder head H can be removed from the cylinder block B without removing the cooling water collecting pipe 2.

As in claim 2, along the cooling water collecting pipe (2) disposed outside the cylinder head (H) and outside the exhaust malhold chamber, electrical wiring (37) required for the engine is provided. Since it is installed side by side, the electrical wiring 37 is protected from the heat of the exhaust manifold 10 and the like by the cooling effect of the cooling water. In addition, when removing the cylinder head H from the cylinder block B, it is not necessary to remove the electric wiring 37.

  Next, an embodiment of the present invention will be described. 1 is a side sectional view showing an exploded structure of an idle gear mounting base, FIG. 2 is a drawing showing an exploded structure of a conventional idle gear mounting base, FIG. 3 is a front sectional view showing a tachometer driving device, and FIG. FIG. 5 is a plan view and a front view showing the configuration of the joint 12, FIG. 6 is a diagram showing the configuration of a conventional tachometer drive device, and FIG. 7 is a configuration of the cooling water pipe shielding structure. FIG. 8 is a drawing showing the configuration of a conventional cooling water pipe shielding structure, and FIG. 9 is also a drawing showing the configuration of a conventional cooling water pipe shielding structure.

  Next, the structure of the radiant heat shielding structure by the cooling water pipe will be described with reference to FIG. The present invention is configured as shown in FIG. 7 in order to eliminate the problems of the prior art shown in FIGS. That is, in the configuration in which the cylinder head H is placed on the cylinder block B and the valve case 40 is disposed on the cylinder head H, the cooling water connecting pipe 39 and the cooling water collecting pipe 2 protruding from the cylinder head H are provided. From both, the heat shield plates 41, 42, and 38 project, and the heat shield plates 41, 42, and 38 and the exhaust manifold cover 1 constitute an exhaust manifold chamber.

  Further, the cooling water collecting pipe 2 is positioned outside the upper side of the cylinder head H, so that the cooling water connecting pipe 39 connected to each cylinder can be removed without removing the cooling water collecting pipe 2. The cylinder head H for each cylinder is detachable from the cylinder block B. Thus, the number of heat shield plates can be reduced by projecting the heat shield plates 41, 42, 38 from the cooling water connecting pipe 39 and the cooling water collecting pipe 2.

  Further, as shown in FIG. 7, an electrical wiring 37 is extended along the outside of the cooling water collecting pipe 2. Since the cooling water collecting pipe 2 is arranged vertically on the cylinder head H of the engine, the electric wiring 37 can also cut the engine vertically. Thus, wiring such as a thermocouple thermometer can be easily connected to an instrument panel, a control device, or the like. Furthermore, although the electric wiring 37 passes through the immediate vicinity of the exhaust manifold cover 1, it receives the cooling effect of the cooling water, so that the electric wire is protected from heat.

  The conventional idle gear mounting base disassembly structure of the internal combustion engine is configured as shown in FIG. Therefore, when the idle gears 15 and 16 are removed, first the flywheel F is removed, then the fixing bolt 13 is loosened and removed, and then the bolt 17 that fixes the presser lid 18 inside the cylinder block B is loosened. The presser lid 18 was removed, the idle gear mounting base 14 was pulled out to the near side, which is the flywheel F side, and finally the idle gears 15 and 16 were removed.

  The disassembled structure of the idle gear mounting base of this configuration is as shown in FIG. In the disassembled structure of the idle gear mounting base, without removing the flywheel F, first, the bolt 17 is loosened and the presser lid 18 is removed, and the idle gear mounting base 8 is slid inside the mounting guide ring 9 so as to mount the mounting guide. By moving the ring 9 to the side closer to the flywheel F, the idle gears 15 and 16 can be removed without removing the flywheel F. Reference numeral 19 denotes a gear that meshes with the idle gear 16.

  A conventional tachometer drive device for an internal combustion engine is configured as shown in FIG. That is, when the gear train is disposed on the flywheel side, the governor mechanism is generally on the flywheel side, and the engine instrument panel is generally on the flywheel side. However, when the instrument panel is on the flywheel side, the camshaft end on the flywheel side is the most convenient takeout position for taking out the mechanical tachometer. That is, when the camshaft is taken out from the shaft end, the gear dedicated to driving the tachometer becomes unnecessary and the cost is reduced.

  However, in this case, since the flywheel or the housing side of the flywheel covers the camshaft end, it is necessary to remove the flywheel during maintenance of the tachometer, and a work machine such as a generator is connected. In some cases, it was necessary to remove these work machines, and there was a problem that it was not realistic. That is, in FIG. 6, the tachometer drive device body 32 is conventionally fixed to the outside of the gear case 4 by the bolts 30 and 31. Therefore, in order to remove the tachometer drive device main body 32 and perform maintenance, it is necessary to remove the bolts 30 and 31 and to remove the portion of the tachometer flexible shaft connecting joint 33 and the portion of the tachometer drive device main body 32. There was. In order to remove the tachometer drive device main body 32 to the outside, it was naturally necessary to remove the flywheel disposed overlapping the portion.

  Next, the configuration of the tachometer driving device will be described with reference to FIGS. For maintenance of the tachometer drive device, conventionally, the outer camshaft flywheel F is removed, and the tachometer drive device body 29 and the tachometer flexure shaft coupling joint 7 are connected to the inner cam. It can be removed toward the inside of the gear case 4 in the axial direction.

  Thereby, in the engine of the flywheel F side gear train, the disassembly / assembly of the mechanical tachometer drive device attached to the flywheel side camshaft end does not remove the flywheel F, the flywheel housing, or the work machine such as the generator. It can be done.

  That is, in FIG. 3, the tachometer flexible shaft connecting joint 7 takes out rotation through the joints 11, 12, 3 to the shaft end of the cam shaft 21, and the tachometer is connected to the tachometer flexible shaft connecting joint 7. To drive. The joint 11 is fastened together with a cam gear at the end of the cam shaft 21 by a cam gear fastening bolt, and has a recess at the tip. As shown in FIG. 5, the joint 12 forms a groove 12 a for the retaining ring 6 at the center, has convex portions on both sides, and one of them fits into the concave portion of the joint 11. The other is fitted in the recess of the joint 3.

  Further, the joint 3 has concave portions on both sides, one of which is fitted with the convex portion of the joint 12 and the other is fitted with the convex portion of the bevel gear shaft 24. The bevel gear shaft 24 transmits power to the tachometer bending shaft coupling joint 7 through bevel gears 25 and 26. The bevel gear shaft 24 is supported by a bearing bracket 27. The bearing bracket 27 is fixed to the tachometer drive device main body 29 by bolts 23. The tachometer drive device main body 29 is fixed to the mounting bracket 28 by bolts 22.

  By fitting the concaves and convexes, the rotation is transmitted, and the misalignment between the cam shaft 21 and the bevel gear shaft 24 of the joint 3 can be absorbed to some extent. Moreover, since the convex part of the both sides of the coupling 12 is parallel, it can be removed from the cam gear lid in the gear case. The joint 12 is removed, and the mounting bolts 22 of the joint 3 and the main body 29 are loosened, leaving the mounting bracket 28, and the portions of the tachometer drive device main body 29 and the tachometer flexure shaft connecting joint 7 are connected to the gear case 4. It can be decomposed inward.

  The joint 12 and the joint 3 are fixed so as not to be detached during rotation by fitting the collar 5, and the collar 5 is not detached in the axial direction by the retaining ring 6 fitted in the groove 12 a of the joint 12. It is configured as follows. By removing the retaining ring 6 and further shifting the collar 5 in the direction of the joint 11, the joint 12 and the collar 55 can be detached from the joint 11 and the joint 3, so that the joint 12 can be detached from the cam gear lid in the gear case 4. is there. Thus, when the bolt 22 is next removed from the inside of the gear case 4, the portion of the tachometer drive device main body 29 and the tachometer flexure shaft coupling joint 7 can be pulled out to the inside of the gear case 4. It can be taken out from the side.

Side surface sectional drawing which shows the decomposition | disassembly structure of an idle gear mounting base. The drawing which shows the decomposition | disassembly structure of the conventional idle gear mounting base. Front sectional drawing which shows a tachometer drive device. The side view which shows the structure of a tachometer drive device. The top view and front view which show the structure of the coupling 12. The figure which shows the structure of the conventional tachometer drive device. Sectional drawing which shows the structure of the shielding structure of a cooling water pipe. Drawing which shows the structure of the shielding structure of the conventional cooling water pipe. It is drawing which shows the structure of the shielding structure of the conventional cooling water pipe | tube.

Explanation of symbols

1 Exhaust manifold cover 2 Cooling water collecting pipe 4 Gear case 5 Collar 6 Retaining ring 8 Idle gear mounting base 9 Mounting guide ring 37 Electrical wiring

Claims (2)

A cooling water collecting pipe disposed on the cylinder head (H) in the structure in which the radiant heat from the exhaust manifold (M) disposed on the side of the cylinder head (H) of the engine is shielded by the exhaust manifold cover (1). (2) is arranged so as to protrude outward from above the cylinder head (H), the heat shield plate (41, 38) is projected from the cooling water collecting pipe (2), and the heat shield plate (41, 38) An radiant heat shielding structure for an internal combustion engine, characterized in that an exhaust manifold chamber is constituted by an exhaust manifold cover (1) . The radiant heat shielding structure for an internal combustion engine according to claim 1, wherein the engine is required outside the exhaust malhold chamber along the cooling water collecting pipe (2) disposed outside the cylinder head (H). A radiation heat shielding structure for an internal combustion engine, characterized in that electrical wiring (37) is provided .