JPS5836910Y2 - Secondary balancer mounting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a secondary balancer mounting device that can be employed in a four-cylinder diesel engine, etc.

Traditionally, the secondary balancer mounting base has been a U-shaped integral molding, or the crankcase has been equipped with a balancer shaft.

However, according to the conventional structure described above, the equipment becomes large in order to carry a weight with a large first moment.

Furthermore, when the balancer and the shaft are integrally molded, the mounting base becomes long, and when they are made separately, the shape of the joint between the shaft and the balancer becomes complicated, resulting in problems that increase costs.

This invention attempts to avoid the above-mentioned conventional problems by splitting the secondary balancer mounting base from the center with a mating surface perpendicular to the crankshaft, and by installing it in a suspended manner on the lower surface of the cylinder block below the crankshaft. This will be explained next using the drawings.

In FIG. 1, the balancer mounting base 3 placed in the crank chamber 2 below the crankshaft 1 (center line 0-0) has a left half 3a and a right half having mating surfaces 4 perpendicular to the crankshaft 1. Part 3
It is composed of a chive split with b, and the left half 3a and the right half 3b
each have a pair of bearings 5, 5, 6, 6 . at one end. , an outward facing 7 flange 7.8 at the other end, and an integral mounting platen 10, 11 for the cylinder block 9 in the center, both 7 langes 7.8 are joined at the mating surface 4, and a plurality of The mounting bracket 10 is tightened with several bolts 12.
, 11 are fastened to the cylinder block 9 by bolts 13.

A pair of balancer shafts 14, 14 each have a weight 15 in the center and shaft parts 16, 16 at both ends, and the shaft parts 16 are supported by bearings 5, 6, so that the entire balancer shaft 14 is mounted inside the mounting base 3. It is supported parallel and rotatably at.

The weight 15 is integrally formed by means such as forging so as to be eccentric from the center line 0 of the balancer shaft 14 in a wide range downward in the figure, and therefore has a large first moment.

Gears 17, 17 having the same number of teeth fixed to a portion of each balancer shaft 14 protruding leftward from the mounting base 3 mesh with each other,
The weights 15, 15 of both balancer shafts 14, 14 are aligned in phase so that they reach the lower end at the same time and the upper end at the same time, and rotate symmetrically in opposite directions at the same rotation speed.

Another gear 18 fixed to one balancer shaft 14,
It meshes with a gear 19 fixed on the crankshaft 1.

The number of teeth of gear 19 is twice the number of teeth of gear 18.

20 is a key, 21 is a lubricating oil inlet, and 22 to 23 are lubricating oil passages.

During engine operation, part of the rotational force of the crankshaft 1 is transferred to the gear 19.
, 18 to one balancer shaft 14, and is further transmitted to the other balancer shaft 14 through the gear 17. It rotates and performs a secondary balancer function.

When assembling balancer mounting base 3, balancer shaft 1
4 from both ends of the baranbu mounting base left half 3a and right half 3
b, tighten both with a plurality of bolts 12, and with the gear 17゜18 fixed to the tip of the balancer shaft 14, place the mounting bracket 10゜11 on the cylinder block 9, and tighten the gear 18゜19. All you have to do is mesh and tighten the bolt 13.

As explained above, according to the present invention, (1) Since the balancer mounting base 3 is split from the center by the mating surface 4 perpendicular to the crankshaft 1, the weight 15 extends significantly from the center line 0□ to one side. Even when the balancer shaft 14 having a large first moment of structure is integrally formed by forging or the like, the balancer shaft 14 can be easily mounted within the balancer mount 3, which makes the balancer mount 3 more compact. .

In particular, since a shaft-integrated weight with a large first moment can be used, the balancer shaft 14 itself can be made compact.

(2) Boss shape of mounting base 3 (mounting bracket 10° 11
) becomes smaller.

Furthermore, since the mounting base itself becomes smaller, processing accuracy also improves.

(3) Since the oil hole can be easily formed in the weight 15, the number of man-hours required for the oil hole in the mounting base 3 is reduced.

(4) Complete sealing is also possible by using a middle mold.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view partially shown in a vertical cross section, and FIG. 2 is a schematic side view including a cross section taken along the line 1--2 in FIG. 1... Crankshaft, 2--... Crank chamber, 3
... Balancer mounting base, 31 ... Left half, 3b ... Right half, 4 ... Matching surface, 5
, 6...Bearing, I, 8...Outward 7 lange, 9...Cylinder block, 10.11.
...Mounting bracket, 14...Balancer shaft, 15...Weight, 16...Shaft, 17゜18.19...Gear〇

Claims (1)

[Scope of utility model registration request] The balancer mounting base, which is placed in the crank chamber below the crankshaft, is divided into left and right halves with mating surfaces perpendicular to the crankshaft, with one pair at one end of each of the left and right halves. A bearing is provided with an outward flange at the other end and a mounting bracket in the center, and both are joined and tightened at the above-mentioned outward crank part to integrate them, and are also fastened to the cylinder block via the mounting seat. A pair of balancer shafts having shafts at both ends were installed in parallel and rotatably in the above mounting base, and gears with the same number of teeth fixed to both balancer shafts were meshed and fixed to one balancer shaft. A secondary balancer mounting device characterized by meshing another gear with a gear on the crankshaft.