JPS6128045Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel supply device mounting structure for a diesel engine.

As a conventional fuel supply device mounting structure, for example, as shown in FIG. 1, which is a schematic plan view of a conventional engine, a pump case 2 for mounting a fuel injection pump 1 is cast integrally with a crankcase 3. Gear case 4 is fixed directly to crank case 3, or crank case 3 is fixed directly to crank case 3 as shown in Figure 2.
There is one in which a thick flange part 6 is integrally cast on one end surface perpendicular to the crankshaft 5, and the pump case 2 is fixed to this flange part 6. However, in the case where the pump case 2 and crank case 3 are integrally cast as shown in FIG. 1, the mold structure is complicated and a large mold is required, making the casting work time-consuming. In addition, in the case of the one shown in Fig. 2, since the thin flange part 6 is cast integrally with the crankcase 3, defects such as breakage and cracking of the flange part are likely to occur, and the casting work including molding is of course time-consuming. Both end surfaces 6a, 6b of the flange portion 6 are precisely machined by cutting, for example, the end surfaces 6a, 6b are made perpendicular to the flange portion 5, and the end surfaces 6a, 6b are
It was extremely difficult to process the surface accurately.

The present invention eliminates the above-mentioned drawbacks of the conventional technology, and its objectives are (1) to facilitate the casting of the crankcase, (2) to improve the mounting accuracy of the pump case,
(3) Improving the mounting strength of the pump case, and (4) improving the flexibility of the pump case mounting angle. The invention will be explained below in conjunction with the drawings.

In FIG. 3, which is a schematic plan view of the diesel engine according to the present invention (arrow F is referred to as the front),
Reference numeral 11 denotes a crankcase formed by integrally forming a cylinder and a cylinder block, and has a plurality of cylinders 12. A front plate 15 made of sheet metal is arranged between the gear case 14 and the front end surface (right end surface in FIG. 3) of the crank case 11 that is orthogonal to the crank shaft 13. The crank case 11 is formed in a shape corresponding to the orthogonal end face shape (shape viewed from arrow A in FIG. 3), and includes an overhang portion 15a that extends beyond the outer peripheral edge of the front end face of the crankcase 11.

Reference numeral 16 denotes a pump case to which the fuel injection pump 17 is attached, and is arranged on the same side of the front plate projecting portion 15a as the crankcase 11. The pump case 16 has a governor case 18
are integrally formed, and a governor case cover 19 is fixed to the rear end opening (left end in FIG. 3) of the governor case 18 with bolts or the like. The number of injection pumps 17 equal to the number of cylinders 12 is provided, but each injection pump 17 is installed in one pump support 20 and is formed as one pump unit, which can be assembled into a pump case. 16 from the insertion hole on the top surface of the pump case 16.
It is inserted into the pump case 16 and fixed to the pump case 16 with bolts or the like.

The front plate 15, pump case 16, and gear case 14 are assembled to the crank case 11 in the following manner. First, front plate 1
5, insert the first bolt 27 inside the gear case 14, which cannot be tightened together with the gear case 14, into the bolt insertion hole of the front plate 15, screw the first bolt 27 into the front end of the crank case 11, and attach the first bolt 27 to the crank case 11. stick. Next, insert the second bolts 21 (for example, three bolts) into the bolt insertion holes of the front plate 15 from the front side of the front plate 15,
The pump case 16 is fixed to the front plate 15 by screwing the second bolt 21 to the front end of the pump case 16. At the same time, the forward-facing stud 22 implanted in the front end of the pump case 16 is caused to pass through the insertion hole of the front plate 15 and protrude forward. Further insert the stud bolt 22 into the insertion hole of the gear case flange boss portion 14a, screw the nut 23 onto the stud bolt 22,
The pump case 16, front plate 15, and gear case 14 are integrally connected. Gear case 14 and front plate 15 are gear case 14
The crank case 11 is further rigidly connected by a number of third bolts 24 arranged on the outer peripheral end of the crank case 11, and is fixed to the front end surface of the crankcase 11 by a fourth bolt 25. That is, the third bolt 24 connects and fixes the front plate 15 and the gear case 14, and is inserted into the insertion hole of the front plate 15 from the rear side of the front plate 15 and screwed into the female screw hole of the gear case flange portion 14a. It is worn.
The fourth bolt 25 is for integrally fixing the gear case 14 and the front plate 15 to the crank case 11, and is for boss portion 14a of flange 14b.
Pass through each bolt insertion hole of the flange boss part 14a and the front plate 15 from the front side,
It is screwed into a female screw hole at the front end of the crankcase 11.

A camshaft 26 parallel to the crankshaft 13 is supported in the pump case 16, and the camshaft 26 rotates as power is transmitted from the crankshaft 13 through a gear transmission mechanism in the gear case 14. The plunger of the injection pump 17 is operated via a tappet or the like.

4 and 5 show another embodiment of the present invention in which the pump case 16 is installed at an angle, and FIG. 4 is a side view of FIG. 3 (view from arrow P).
This corresponds to FIG. 5, and FIG. 5 shows a cross section taken along line V-V in FIG.
In the present invention, there is no need to use the upper and lower machined surfaces, left and right machined surfaces, etc. of the crankcase 11 for mounting the pump case 16, or to provide any special machined surfaces, so the pump case 16 can be attached to the pump case 16 as shown in FIG. By giving an angle θ to the fuel injection pump support 20, it is possible to avoid interference with the intake manifold 28 attached to the cylinder head 27 when attaching and detaching the fuel injection pump support 20, and to fit the pump case 16 in accordance with the shape of the outer wall of the crankcase 11. The entire engine can be made more compact. That is, in the conventional example shown in FIG. 1, since a space is provided above the fuel injection pump 1, the intake manifold 28 (FIG. 5) cannot be provided, and the fuel injection pump 1 (the first
It is necessary to make modifications such as extending the engine (see figure) outward or lowering the mounting surface, which increases the overall size of the engine. In addition, in the example shown in Fig. 2, the pump case 2
Since the mounting flange 6b is cut, the flange shape is restricted, and the fuel injection pump 2 also protrudes outward.

As explained above, according to the present invention: (1) The casting work of the crankcase 11 does not take much time. That is, the pump case 16 is separate from the crank case 11, and there is no need to cast a special flange for mounting the pump case 16 (flange 6 in Fig. 2) integrally with the crank case 11, so the mold is complicated. In addition, the crankcase 11 does not become large in size, and the casting work of the crankcase 11 does not take much time.

(2) The pump case 16 can be rigidly supported. That is, since the pump case 16 is fixed to a rigid joint in which the front plate 15 and the gear case 14 are integrally joined, the support of the pump case 16 becomes rigid.

(3) The mounting accuracy of the pump case 16 is high. That is, the crank case 11, the pump case 16, and the gear case 14 are each joined to the front plate 15, and the front plate 15
is made of thin (sheet metal), etc., rather than casting, so the parallel relationship between the camshaft 26 and the crankshaft 13, and the positional relationship between each gear in the gear case 14 and the crankshaft 13 and camshaft 26,
Accurate alignment can be performed using the front plate 15 as a reference. Therefore, the mounting accuracy of the pump case 16 is high.

(4) The mounting angle θ of the pump case 16 can be arbitrarily selected. That is, the pump case 16 can be machined as a single unit without being limited to the machined surface of the crankcase 11, conforms to the shape of the outer wall of the crankcase 11, avoids interference with the intake manifold 28, and provides an angle θ to make the entire engine compact. Can be done.

The important features and advantages of the present invention are summarized as follows.

By using the thin sheet metal front plate 15 as a flange of the pump case 16 for mounting the fuel injection pump, the mounting accuracy of the pump case 16 can be improved, and the front plate 15 can be mounted between the gear case 14 and the end face of the crank case 11. By sandwiching the pump case 16 between the pump case 16 and the pump case 16, the support of the pump case 16 is made rigid.

That is, since the pump case 16 and gear case 14 are joined to a thin sheet metal front plate 15 placed on the end face of the crank case 11, the parallel relationship between the camshaft 26 and the crankshaft 13, and the relationship between each gear in the gear case 14 are maintained. The positional relationship between the crankshaft 13 and the camshaft 26 can be precisely aligned with the front plate 15 as a reference, and the end face shape of the gear case 14 can be made to correspond to the shape of the front plate 15. Since the front plate 15 is sandwiched between them, even though the front plate 15 made of thin sheet metal is used as described above,
5 has high support strength, and the pump case 16 can be rigidly supported by the front plate 15.

[Brief explanation of the drawing]

1 and 2 are schematic plan views of a diesel engine showing a conventional example, FIG. 3 is a schematic plan view of a diesel engine to which a fuel supply system according to the present invention is applied, and FIG. 4 is a schematic plan view showing another embodiment of the present invention. 3 is a view corresponding to arrow P in FIG. 3, and FIG. 5 is a sectional view taken along line V-V in FIG. 4. DESCRIPTION OF SYMBOLS 11...Crank case, 13...Crankshaft, 14...Gear case, 15...Front plate, 15a...Protrusion part, 16...Pump case, 17...Fuel injection pump.

Claims (1)

[Scope of utility model registration request] A thin sheet metal front plate is placed between one end of the crankcase perpendicular to the crankshaft and the gear case, and an overhang is formed on the front plate that extends beyond the outer periphery of the crankcase end. The shape corresponds to the end face perpendicular to the shaft, and the pump case for mounting the fuel injection pump is placed on the same side of the overhang as the crankcase, and the front plate and gear case are integrally fixed to the crankcase. A fuel supply device mounting structure for a diesel engine, characterized in that the pump case is sandwiched between the end faces of a gear case and a crankcase, and is fixed to a projecting portion of a front plate and a gear case.