JPH045699Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a flywheel housing support device for an engine, and the present invention is capable of accurately aligning the power take-off shaft with the power take-off hole of the flywheel housing, and has a simple structure. provide something.

<Prior art> The basic structure of the engine flywheel housing support device, which is the subject of the present invention, is shown in FIG. 1 or 2.
As shown in the figure, crankcase 1 of engine E
The case cylinder part 6 of the main bearing case 5 is fitted into the boss hole 4 of the main boss 3 formed on the rear wall 2, and the mounting flange part 7 of the main bearing case 5 is inserted.
is brought into contact with the rear end surface 8 of the main boss 3 from the rear and fixed with a mounting bolt 10, and the shaft rear part 14 of the crankshaft 12 is passed through the main bearing case 5, and is rotatably supported by the main bearing 15. A flywheel 16 and a power take-off shaft 17 are fixed to the rear shaft 14 outside the rear surface of the main bearing case 5, and the front end 19 of the flywheel housing 18 that covers the flywheel 16 is attached to the crankcase 1 through a support plate 20. A power extraction hole 22 is formed in the rear wall 21 of the flywheel housing 18 concentrically with the power extraction shaft 17, and the power extraction shaft 17 is connected to the power extraction hole 2.
It is of a type that is configured to protrude rearward from 2.

As shown in FIG. 2, this type of prior art includes a main boss 3 on the rear wall 2 of the crankcase 1.
Separately forming a support plate boss 100 further outward,
A tightening hole 101 and a positioning hole 102 are made in this boss 100, and the dowel pin 1 of the support plate 20 is opened.
03 into the positioning hole 102 and position it, then attach the support plate 20 with the mounting bolt 104.
There is one in which the support plate boss 100 is fixed to the support plate boss 100.

<Problems to be solved by the invention> However, the above-mentioned conventional technology has the following problems.

(1) The support plate 20 is positioned with respect to the crankcase 1 by fitting the dowel pin 103 of the support plate 20 into the positioning hole 101 of the crankcase 1, but it is fixed to the support plate 20 due to processing errors or the like. The flywheel housing 18 may be displaced from the center of the crankshaft 12.

As a result, there is a large possibility that the power take-off shaft 17 will be misaligned from the power take-off hole 22 of the flywheel housing 18.

(2) When attaching the support plate 20 to the crankcase 1, the support plate boss 100 is attached to the crankcase 1.
and a tightening hole 10 in the boss 100.
1 and positioning hole 102, and support plate 20.
Since the knock pin 103 must protrude, the structure of the entire device becomes complicated.

The technical problem of the present invention is to precisely align the power take-off shaft with the power take-off hole of the flywheel housing and to simplify the structure.

<Means for Solving the Problems> Means for achieving the above problems will be described below using drawings corresponding to embodiments.

That is, the present invention provides a flywheel housing support device for an engine having the above-mentioned basic structure, in which the rotation of the crankshaft 12 is located behind the case cylindrical portion 6 of the main bearing case 5 and beyond the insertion hole 23 of the mounting bolt 10 of the mounting collar 7. A centering outer circumferential surface 24 is formed on the axis side, and a bearing case passage hole 25 formed in the support plate 20 is formed to have approximately the same diameter as the centering outer circumferential surface 24 of the main bearing case 5. is fitted onto the outer peripheral surface 24 for centering in a centered manner, and the bearing case passing hole 25 is fitted with the hole circumferential wall portion 26 and is overlapped at the flange 7, and then fitted onto the rear end surface 8 of the main boss 3 from the rear. The hole circumferential wall portion 26 of the support plate 20 is in contact with the rear end surface 8 of the main boss 3.
It is characterized in that it is fixed together with the mounting flange 7 of the main bearing case 5 using mounting bolts 10.

<Function> Bearing case passage hole 2 made in support plate 20
The flywheel housing 18 fixed to the support plate 20 can be arranged concentrically with the main bearing case 5 by bringing the flywheel housing 18 into contact with the centering outer circumferential surface 24 of the main bearing case 5 in a centered manner and fitting the flywheel housing 18 onto the support plate 20 .

Also, the support plate 20 is attached to the rear wall 2 of the crankcase 1.
When attaching the support plate 20 to the rear end face 8 of the main boss 3 while overlapping the hole circumferential wall portion 26 at the attachment collar 7, it is sufficient to secure the support plate 20 to the rear end face 8 of the main boss 3 by tightening the attachment bolts 10 together. There is no need to form a support plate boss on the crankcase 1 or provide a dowel pin or a mounting bolt on the support plate 20.

<Effects of the invention> (1) Since the support plate is directly fitted onto the outer peripheral surface of the main bearing case for centering, the power take-off shaft can be accurately aligned with the power take-off hole in the flywheel housing. .

(2) Since the support plate and the main bearing case are simply fastened together to the rear wall of the crankcase, the structure of the entire device can be simplified.

(3) In existing engines, the main bearing case is fastened to the rear wall of the crankcase with mounting bolts, but in this invention, the support plate is simply fastened to the crankcase together with the main bearing case by utilizing the fastening structure. This eliminates the need for modification on the crankcase side, making it simple and inexpensive to implement.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional plan view of essential parts showing a flywheel housing support device of a horizontal engine E. It is composed of a plate 20 and a flywheel housing 18.

That is, a main boss 3 is formed on the rear wall 2 of the crankcase of the horizontal engine E, a boss hole 3 is formed in the main boss 3, and the case cylindrical portion 6 of the main bearing case 5 is fitted inside the main boss 3.

A main bearing 15 is fitted into the main bearing case 5, and the crankshaft 12 is rotatably supported by the main bearing 15, and an outer circumferential surface 24 for centering is formed on the case 5, which is flush with the case cylindrical portion 6. Then, a mounting collar 7 is continuously provided outside the outer circumferential surface 24 with the crankshaft 12 as the center, and a bolt insertion hole 23 is formed in the collar 7.

The shaft rear part 14 of the crankshaft 12 is passed through the main bearing case 5 rearward, and the flywheel 16 is attached to the tip of the shaft rear part 14 with a fastening bolt 30.
to be fixed.

Further, the power take-off shaft 17 is fixed to the rear wall portion 31 of the flywheel 16 concentrically with the crankshaft 12 via a fastening bolt 32.

Furthermore, the flywheel housing 18 includes:
It covers the flywheel 16, and a power extraction hole 22 is opened in the center of the rear wall 21 concentrically with the power extraction shaft 17.

On the other hand, a circular bearing case passage hole 25 is formed in the support plate 20, and the outer diameter of the passage hole 25 is set approximately equal to the inner diameter of the centering outer peripheral surface 24 of the main bearing case 5. The support plate 20 is attached to the rear end surface 8 of the main boss 3.
The outer circumferential surface 24 for centering of the main bearing case 5 is fitted into the bearing case passage hole 25, and the support plate 20 is attached to the front wall of the mounting flange 7.
Align the back wall.

At this time, the hole circumferential wall portion 26 of the support plate 20 near the passage hole 25 is superimposed on the mounting flange 7 of the main bearing case 5, and the insertion hole 2 of the mounting flange 7 of the main bearing case 5
By screw-fitting the mounting bolt 10 to the main boss 3, the support plate 20 is attached to the rear end surface 8 of the main boss 3.
The hole circumferential wall portion 26 is fixed together with the mounting flange 7 in a fastening manner.

In addition, a knock pin 3 is attached to the outer peripheral portion 33 of the support plate 20.
4, a positioning hole 35 is formed in the front end 19 of the flywheel housing 18 that covers the flywheel 16, and the positioning hole 35 is formed in the knock pin 34.
5, the flywheel housing 18 is attached to the support plate 20 and removably fixed with bolts (not shown), and the power extraction shaft 1 is inserted through the power extraction hole 22 formed in the flywheel housing 18.
7 to protrude backwards.

In this case, the support plate 20 is fitted around the centering outer peripheral surface 24 of the main bearing case 5 so that the center of the support plate 20 is centered on the crankshaft 1.
4. That is, since the power extraction shaft 17 can be easily aligned with the axis of the power extraction shaft 17, the power extraction hole 22 of the support plate 20 can be set concentrically with the power extraction shaft 17.

As described above, in the present invention, the support plate 20 is attached to the crankcase rear wall 3 using the outer peripheral surface of the main bearing case 5.
Since the power take-off hole 22 of 0 is aligned concentrically with the power take-off shaft 17, it is not limited to the structure in which the power take-off shaft 17 is provided separately from the crankshaft 14 as in the above embodiment; It is also possible to extend the shaft 14 as it is and use it as the power extraction shaft 17.

Further, the support plate 20 is not limited to the structure in which it is sandwiched between the mounting flange 7 of the main bearing case 5 and the rear end wall 8 of the main boss 3 as in the above embodiment; A centering outer circumferential surface 24 may be formed on the main boss 3, and the mounting collar 7 may be sandwiched between the support plate 20 and the rear end wall 8 of the main boss 3.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view of essential parts showing a flywheel housing support device for a horizontal engine according to an embodiment of the present invention, and FIG. 2 is a view corresponding to FIG. 1 showing the prior art. 1...Crankcase, 2...Rear wall of 1, 3...
...Main boss, 4...Boss hole, 5...Main bearing case, 6...Case cylinder part of 5, 7...Mounting flange, 8...Rear end wall of A, 10...Mounting bolt, 12... Crankshaft, 14... 12 shaft rear, 15... Main bearing, 16... Flywheel, 17... Power extraction shaft, 18...
Flywheel housing, 19... Front end of 18, 20... Support plate, 21... Rear wall of 18, 22
... Power extraction hole, 23 ... 7 insertion hole, 24
...outer circumferential surface for centering, bearing case passing holes 25...20, wall portion around the holes 26...20.

Claims (1)

[Scope of Claim for Utility Model Registration] The case cylindrical portion 6 of the main bearing case 5 is fitted into the boss hole 4 of the main boss 3 formed on the rear wall 2 of the crank case 1 of the engine E, and the mounting flange of the main bearing case 5 is 7 to the rear end surface 8 of the main boss 3 from behind, and then tighten the mounting bolt 10.
The shaft rear part 14 of the crankshaft 12 is passed through the main bearing case 5, and is rotatably supported by the main bearing 15.
The shaft rear part 14 is outside the rear surface of the main bearing case 5.
The flywheel 16 and the power take-off shaft 17 are fixed to the front end 19 of the flywheel housing 18 that covers the flywheel 16 and is fixed to the rear wall 2 of the crankcase 1 via the support plate 20. Power extraction hole 22 in the rear wall 21 of
In an engine flywheel housing support device configured by having a hole concentrically with the power take-off shaft 17 and the power take-off shaft 17 protruding rearward from the power take-off hole 22, the main bearing case 5 is attached to the rear of the case cylindrical portion 6. A centering outer circumferential surface 24 is formed closer to the rotational axis of the crankshaft 12 than the insertion hole 23 of the mounting bolt 10 of the flange 7, and the bearing case passage hole 25 formed in the support plate 20 is aligned with the center of the main bearing case 5. The bearing case passage hole 25 is formed to have approximately the same diameter as the centering outer circumferential surface 24, and the bearing case passage hole 25 is fitted onto the centering outer circumferential surface 24 in a centered manner, and the hole peripheral wall portion 26 of the bearing case passage hole 25 is attached to the flange. Abut the rear end surface 8 of the main boss 3 from the rear in an overlapping state at the section 7, and attach the hole circumferential wall portion 26 of the support plate 20 to the rear end surface 8 of the main boss 3.
An engine flywheel housing support device, characterized in that it is co-fastened with the mounting flange 7 of the engine.