JPH03129143A - Vibration restraining device for engine - Google Patents

Abstract

PURPOSE:To restrain the vibration of an engine by constituting a planet gear mechanism for reversely rotating a plurality of center gears with two times the rotational speed of a crankshaft forming a predetermined unbalanced mass in linear symmetry to each center gear. CONSTITUTION:A center gear 11 having an unbalanced mass is provided rotatably coaxially on a crankshaft 1 inside a crank pulley 2. Also, a planet gear mechanism 10 for transmitting a turning force from the crankshaft 1 to the gear 11 is provided inside a pulley 2. A center gear 31 is provided rotatably coaxially on the crankshaft 1 inside a flywheel 5, and a planet gear 30 for transmitting the turning force from the crankshaft 1 to the gear 31 is provided inside the flywheel 5. The gears 11, 31 are reversely rotated by the respective mechanisms 10, 30 in the opposite direction to that of the crankshaft 1 at two times the rotational speed thereof. Thus, an exciting force generated by the gears 11, 31 cancells an exciting force generated along with the reciprocation of a piston and connecting rod to restrain the vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration suppression device for an engine having a rigid mass that rotates in synchronization with a crankshaft.

(Prior art) In reciprocating engines that are widely used as automobile engines, vibrations are unavoidably generated due to the reciprocating motion of the pistons and rods, and these engine vibrations are transmitted into the passenger compartment, causing unpleasant noises. This may occur.

As a countermeasure against this problem, conventionally, for example, as shown in FIG. 16, a single balance shaft 62 is rotatably housed in a cylinder block 61 of a type 6 engine between the left and right banks. This balance shaft 62 has a predetermined unbalanced mass about its center of rotation, and rotates at a predetermined speed with respect to the crankshaft 64 via a timing chain 63, a gear 67, etc. (Auto+noLive EngineerinF
! Published by Ford, October 1988 (see page 54).

In this case, a crank pulley 65 and a seven-wheeler 6G are connected to the front and rear ends of the crankshaft 64, and the balance shaft 62 is arranged between the left and right banks in equilibrium with the crank pulley 65.

(Problem to be Solved by the Invention) However, in such a conventional device, the balance shaft 62 is disposed laterally at a predetermined distance from the crankshaft 64, and is housed in the Schilling Bronchro 1. This has resulted in problems such as an increase in the size of the shilling block 61 and restrictions on the shape of the intake pipe or protrusion pipe connected to the side wall of the shilling block 61.

The present invention aims to solve these conventional problems.

(Measures to solve the problem #ri) In order to achieve the above object, the present invention includes a plurality of center gears rotatably provided on the same axis as the crankshaft,
An internal gear located on the outside of each center gear and connected to the crankshaft, and a planet gear that meshes with both gears and whose rotating shaft is connected to the engine block are provided, so that each center gear is connected to the crankshaft in two directions.
Planetary gear 8 that rotates in reverse at twice the rotation speed! organize the structure,
A predetermined unbalanced mass was formed in each center gear so as to be symmetrically #X with respect to the rotation center line of the crankshaft.

(Function) Based on the above f'M, each unbalanced mass arranged symmetrically rotates at twice the speed of the crankshaft as the crankshaft rotates, so that each unbalanced mass The excitation force generated by rotation cancels out the vibrations generated by the reciprocating movement of the piston and connecting rod that are linked to the crankshaft, suppressing engine vibration.

By arranging the planetary gear mechanism coaxially with the crankshaft, it can be housed inside the damper pulleys and flywheels provided at both ends of the crankshaft, and the unbalanced mass can be installed on the side of the shilling block. This can be avoided and the engine can be made more compact.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

In Figure 1, 1 is the engine crankshaft, 2
is a crank pulley connected to the front end of the crankshaft 1, and a plurality of belt grooves 3 are formed on the outer periphery of the crank pulley 2, and the alternator is connected to each belt groove 3 via a belt (not shown) that is rotated. It is designed to drive auxiliary equipment such as the engine and water pump.

A center gear 11 is provided inside the crank pulley 2 as a rotating body having an unbalanced mass so as to be rotatable coaxially with the crankshaft 1 . As shown in FIG. 2, the annular center gear 11 has two hollow parts 12 formed in an arc shape on one side, leaving an arc-shaped mass on the opposite side to the hollow parts 12, and a predetermined deviation about the center of rotation of the ring-shaped center gear 11. constitute an equilibrium mass.

Inside the crank pulley 2, there is a planetary tooth 1i1 which transmits the rotational force from the crankshaft 1 to the center gear 11.
is provided. The planetary gear mechanism 10 includes an internal gear 13 integrally formed with the crank pulley 2 and three planet gears 14 interposed between the internal gear 13 and the center gear 11. Each planet gear 14 is supported by the Schilling gear 4 via a planet carrier 17, and as the crank pulley 2 rotates, each planet gear 14 accelerates and rotates the center gear 11 in the opposite direction. Each gear ratio is set so that the rotation speed of the center gear 11 is twice the rotation speed of the crank pulley 2.

Note that the crank pulley 2 is fastened to the front end of the crankshaft 1 via a bolt 18 that is threaded into the front end.

The planet carrier 17 is fixed to a support member 21 fixed to the shilling block 4 via a pin 22. The planet gear 14 is rotatably supported by a rotation 1Ih15 fixed to the planet carrier 17 via a bearing 19. The center gear 1■ is rotatably supported by the planet carrier 17 via a metal bearing 23.

The dust cover 24 is fixed to the rear end of the crank pulley 2, and the dust cover 24 is fixed to the rear end of the crank pulley 2.
4 is provided with a sealing member 25 in sliding contact with the planetary tooth J11.
The oil that has lubricated the mechanism 10 is returned into the shilling block 4 through the through hole 26.

On the other hand, at the rear end of the crankshaft 1 is a 7-wheeler 5.
are connected to each other, and the rotational force is transmitted to the transmission via the crunch wheel 5. A ring gear 8 is fixed to the outer periphery of the flywheel 5, and rotational force from a starter motor is transmitted when the engine is started.

A center gear 31 is rotatably provided inside the flywheel 5 coaxially with the crankshaft 1. The annular center gear 31 is formed in the same shape as the center gear 11 shown in FIG.
A predetermined unbalanced mass is established about the center of rotation.

A planetary gear mechanism 30 that transmits rotational force from the crankshaft 1 to a center gear 31 is provided inside the flywheel 5 . The planetary gear mechanism 30 includes an ink null gear 33 integrally formed with the flywheel 5 and three planet gears 34 interposed between the ink null gear 33 and the center gear 31. Each planet gear 34 is supported by the shilling block 4 via a planet carrier 37, and as the flywheel 5 rotates, each planet gear 34 accelerates and rotates the center gear 31 in the reverse direction. center gear 3 relative to the rotation speed of flywheel 5.
Each gear ratio is set so that the number of rotations of 1 is doubled.

Note that the planet gear 34 is rotatably supported by a rotating shaft 35 fixed to a planet carrier 37 via a bearing 39. The center gear 31 is rotatably supported by a member 40 fixed to the planet carrier 37 via a metal bearing 41.

A dust cover 44 is fixed to the rear end of the flywheel 5, and a sealing member 45 is provided on the shilling block 4 to make sliding contact with the guest cover 44. block 4
It is meant to be brought back inside.

When assembling each center gear 11 and 31, which have the same shape to each other, to the crankshaft 1, each center gear 1
1 and 31 are arranged at three angles that differ from each other by 180 degrees, and the respective unbalanced masses are arranged in line symmetry with respect to the central axis of rotation of the crankshaft 1.

Explain the effects to your dog.

Each center gear 11, 31 is a planetary gear mechanism 10.
30 causes each center gear 11.3 to rotate in the opposite direction to the crankshaft 1 at twice the speed.
The excitation force generated in the engine 1 cancels out the excitation force generated due to the reciprocating motion of the piston and connecting rod, thereby suppressing the vibration of the engine as a whole.

Here, the couple M acting on the unbalanced mass provided in the relationship shown in Figures 4 and 5 is MOCρca 2 (R'r') (1) where ρ is the density of the material and ω is the angular velocity. ”-a2)s
Represented as inff.

When the bank angle is ■, the unbalanced couple rotates in the opposite direction to the crankshaft, so the unbalanced mass is 1
By giving the angle i that is 80 degrees symmetrical and the numerical value determined based on the above equation, it becomes possible to cancel the remaining unbalanced couple when ■≠90 degrees.

Planetary gear! By arranging the V110.30 coaxially with the crankshaft 1, the center gears 11 and 31 having unbalanced masses are housed inside the crank pulley 2 and flywheel 5 provided at both ends of the crankshaft 1, respectively. Power? This makes it possible to avoid installing a balance shaft on the side of the shilling block as in the past, and the engine can be made more compact.

(Effects of the Invention) As described above, according to the present invention, the planetary tooth J't141 fM reversely rotates the plurality of center gears that are rotatably provided coaxially with the crankshaft at twice the rotation speed with respect to the crankshaft. Since each center gear has a predetermined unbalanced mass that is symmetrical to each other about the rotation center line of the crankshaft, it cancels out the vibrations caused by the reciprocating motion of the pistons and connecting rods, effectively suppressing engine vibrations. - On the other hand, planetary gear? By housing the N6ff inside the crankboo or flywheel, the conventional balance shaft installed on the side of the engine can be eliminated, making the engine more compact.

[Brief explanation of the drawing]

FIG. 1 is a front longitudinal sectional view of an engine showing an embodiment of the present invention, FIG. 2 is a side view of a center gear, and FIG. 3 is a rear longitudinal sectional view. Figure 4 is a model diagram to explain the action, Figure 5
The figure is also a side view. Figure tJS6 is a front view of an engine showing a conventional example. 1... Crankshaft, 2... Crank pulley,
4... Schilling block, 5... Flywheel,
10... Planetary gear mechanism, 11... Center gear, 13
...Internal Gear, 14...Planet Gear, 3
0... Planetary gear mechanism, 31... Center gear, 33.
...Internal Gear, 34...Planet Gear. Figure 3 j4. Burafu, Tosenia Diagram

Claims (1)

[Claims] A plurality of center gears that are rotatably provided on the same axis as the crankshaft, an internal gear located outside each center gear and connected to the crankshaft, and a planet gear that meshes with both gears and whose rotating shaft is connected to the engine block. A planetary gear mechanism is configured in which each center gear rotates in the opposite direction at twice the rotational speed of the crankshaft, and each center gear has a predetermined gear arranged symmetrically with respect to the rotational center line of the crankshaft. An engine vibration suppression device characterized in that an unbalanced mass is formed.