JPS5950819A - Vibration-proof support structure for engine - Google Patents

Abstract

PURPOSE:To prevent resonance by providing more than three sets of vibration- proof supporters where two vibration-proof rubbers above and below of a cylinder block are arranged in series on both sides of engine thereby absorbing vibrations in more than two directions of back/fro, left/right and up/down. CONSTITUTION:It is formed such that the spring spindle connecting between the upper vibration-proof rubbers 2, 4 above a vibration-proof supporter will lie along the inertia spindle in back and fro direction, to absorb vibration and pitching in back and fro direction. When arranging said rubbers 2, 4 in V-shape, absorbing function is effective for up/down vibration and rolling. Then vibration- proof rubbers 3, 5 are arranged below to absorb mainly up down vibration and rolling thus to absorb vibration effectively through double vibration-proof rubber. Furthermore in view of spring constant, when providing two vibration-proof rubbers in series the resonance point will be lower than the idling of engine to eliminate resonance point from normal rotation area.

Description

[Detailed description of the invention] The present invention relates to a vibration-proof support structure for an engine.

Conventionally, a configuration in which the engine is supported via a vibration-proofing plate has been implemented, but each vibration-proofing support part has a vibration-proofing plate,
11IIllI, so depending on the position of the vibration damper, engine vibrations, left and right vibrations, front and back vibrations,
Although vibrations in the - direction such as pitching, rolling, and yawing are effectively absorbed, there is a problem in that vibrations in other horn directions remain.

The present invention effectively absorbs vibrations in another direction by arranging two anti-vibration rubbers in series on the anti-vibration support sections.

Also, by arranging two anti-vibration rubbers in series, one
Even if the individual spring coefficients are large, there is an advantage that the spring coefficient will be small as a whole when arranged in series, and as the spring coefficient becomes small, the frequency of the resonance point will be lower, and it will be lower than the idling rotation of the engine. By lowering the rotation speed, it is possible to create a configuration that does not generate resonance within the normal rotation speed range of the engine, and by arranging two pieces in series, vibration isolation that is a dog of the spring coefficient can be achieved. It is possible to reduce the deflection rate and improve the durability of the anti-vibration comb by using two combs.1) The purpose of the present invention is as follows. The detailed structure of the present invention will be explained based on the structure of the embodiment shown in FIG.

Figure 1 is an overall side view of the engine mounted on a walk-behind agricultural machine such as a tiller, Figure 2 is a side view of the engine mounted on the engine plate via a vibration isolation frame, and Figure 3 is the vibration isolation frame. 4 is a side view of the case supported by 8 anti-vibration rubber parts, Fig. 5 is a plan view of the anti-vibration frame supported by 6 anti-vibration combs, Fig. 6 d, Also a side view, Figure 7 shows the floating rose/-1, l-engine and vibration-proof rubber series 2.
It is a graph showing the vibration level in the case of heavy equipment.

The engine is/renoder block (6),/linder head +241, air cleaner (1η, muffler, flywheel t25+, crank yaf l-+331)
, and the radiator and fuel tank in the upper horn bar (18), the crank/yaf l-+331 can be placed in the left and right directions in the direction of travel of the tiller, and the /linder can be placed in the front and rear directions (7~ It is a water-cooled engine.

In the case of a horizontal water-cooled engine, vibration and pitching in the longitudinal direction of the main axis of inertia passing through the center of gravity are particularly large due to the relationship between the arrangement of the renoder and the direction of movement of the piston.

In Figure 1, the engine flenometer (8) is directly used as a vibration-proof rubber seat on the work machine side, and the vibration-proof rubber seat of Edge 7ItjII is directly connected to the engine's 7RinodaburrJ'7 (6
) stands out. That is, the front part is edgy/1li
l Group 1■iτ19 Glue/durp the anti-vibration gono-seat (10) ``cock (6) or C) protrude 2, then place the anti-vibration rubber (4) on the tip ψMi, then the intermediate seat (9) 1') J Ih*go1151 interposed, engine 1/-no, +81 VC
Concatenate and -C.

At the rear, there is a rear anti-vibration gong l from Akira Fujino, and a seven-reinade block (6) protrudes from the seat (12), with a VC anti-vibration bump at the tip.
f2) L is interposed, and the anti-vibration horn is inserted through the intermediate seat (11).
(3) is placed on 77 v -A ts+. Anti-vibration horn, (51i1 engine freno・(
8), and the anti-vibration rubber (5) is -
Although the flu:I is installed in the 1x F direction, it may be placed in the upper part, front to back.

Engineering/Simphreno, t81id Misonyono'/”-su(
++, 1:j, 1 is provided protrudingly, and -1itB of Mitsu/Yo/Case (1) is provided with a human powered V pulley (field).

In addition, the lj axis (
13) protrudes σ, and the middle ring 115i +151 is supported. (20) is a no-no) lever cover 1, and a power transmission gear (21) is provided from the PTOIllll of the Mitsu/Jin case (1), which transmits power to the rotary tillage device (rib).

A V-belt (7) is suspended from the output V-pulley fixed to the engine crank 7-yaft + 33) to transmit power to the aforementioned human-powered V-pulley ti9].

In the case of Fig. 2, a cassette-type toshi vibration isolation frame is integrated into the engine, and the engine integrated with this vibration isolation frame is mounted on a conventional engine frame (8a), lx (
＝j is possible. Also, the engine itself is a conventional 7
The structure is such that a vibration-proof structure can be created with the Linder block (6) as it is.

Immediately, when attaching the conventional engine to the engine frame (8a), the engine side anti-vibration rubber seat (12a) is installed on the mounting seat.
) is attached, the rearwardly protruding part is bent in the L direction, and the anti-vibration horn (2) is interposed at a high position.

Then, an anti-vibration horn (3) is provided via an intermediate seat which is also curved in an arc shape, and is connected to the anti-vibration goto seat frame on the work machine side.
ing.

In addition, the front part has the engine side anti-vibration goto seat (river) and intermediate seat (9).
A vibration isolating horn (4) is interposed between the two, and a vibration isolating comb (5) is inserted between the intermediate seat (9) and the work machine side vibration isolating rubber seat (28). (26) is a generator, and because of this generator, the vibration-proof rubber seat (4) on the engine side has a large protrusion. (The clock is a bumper.

In Figures 3 and 4, eight anti-vibration goggles are provided. ! ! I
! ? 3. A phantom vibration-proof support structure of 2 series type with 4 vibration-proof gols is installed on the 3rd, and 2-piece series type IM with 4 vibration-proof horns on the rear part; J'? In the case of the anti-vibration anti-vibration support structure 1, Figures 5 and 6, the V-belt (7) is used! I￥
t:11 Only in the horizontal direction, a series-type vibration-proof support device is provided with three vibration-proof horns, so that the engine does not move back and forth due to vibration. This prevents the V-belt from loosening or becoming too tense in preparation for i11'' when excessive vibration occurs, which would cause the power transmission efficiency to deteriorate.

Next, let me explain the effect.

Conventionally, a receiving surface for the engine frame (8) of the working machine was provided on the 1st surface of the Linderb screw (6), a bolt was inserted into the receiving hole on this surface, and the engine frame (8) was inserted. It is possible to install it by tightening it between the two ends.

However, this mounting method had the problem that vibrations were transmitted throughout the aircraft.

In the present invention, a vibration isolating support device consisting of two vibration isolating rods at positions 1-1 and - on the left and right in the axial direction of the crane/lift/yaft, two sets of four silks, and one We set up three groups,
It supported the engine.

In the vibration of the edge/, the center of vibration is the weight of the edge 7, ((1), and the center of gravity <a> is often located near the crank/year 71.

Therefore, vibrations in the directions of the principal axis of inertia in two directions, forward, backward, -right, and upward 1, passing through this center of gravity (G), as well as yawing, pitching, and IJing with the principal axis of inertia as the center of rotation. Six types of vibrations are generated.

In the case of a horizontal water-cooled engine like the one in this embodiment, vibration and pitching in the longitudinal direction are much greater than in the case of a horizontal water-cooled engine. By the way, vertical vibration and rolling are particularly large in vertical water-cooled engines.

In the present invention, especially when viewed from the side, the anti-vibration bracket of the −L portion, the +
The main axis of the spring connecting 2+ +41 is configured along the main axis of inertia in the front-rear direction, and vibration in the front-rear direction and bi.

It is the most effective way to absorb tinging. .

Also, the anti-vibration Kono, +21 (Koriko, who glares at 4+ and forms it into 1\-1 form into 1...1 form), -1-1 vibration and ``For J-link. 1 also has an effective VC absorbing effect, and there is also a vibration-proof plate in the l-' section, (3) +5
1 is arranged i/, l, and 1- is configured to absorb vibration and rolling in the -C11° direction, and 1 of 2 (due to the horn swinging) effect V This vibration is absorbed.Also, from the point of view of the spring constant, I will explain the advantage of providing two damping columns in a row.

Two springs with spring constants (kl) (k2) are connected in series V (via ν
:The spring constant (ka) when

As a result, the frequency (fr) of the resonance point of the engine due to the spring constant (k) and the weight (river) is, so as (k) becomes smaller, the resonance point becomes lower, and is lower than the engine's idling rotation. If it is possible to lower the resonance point and eliminate the resonance point within the engine's normal rotation range, it is possible to eliminate the frequency range where vibration is most intense.

Also, when two springs of spring i ((kl) (k2)) are inserted, the deflection rate is better than that of spring i (kl) (k2).
In other words, it also has the effect of being able to exhibit the same vibration absorption effect with less deflection.

Figure 7 shows the υ1 rotor engine when (P′I) is directly mounted on the engine rule τj.
・The vibration level at the steering wheel position iIj is shown against the engine rotation speed V, and (b) shows the vibration level of the engine without a balancer when the anti-vibration support device of the present invention is applied.
The vibration level at the dollar position is shown as a function of the engine rotation speed G'.

The vibration level is noticeably low. .

As described in 2 above, the present invention includes two vibration isolators installed in series on both sides of the engine, one above the renoder block and the other on the rinse subbed. The 4'4+ section is connected to the vibration damper configured in series with I 1
Since the lill was configured with 1 set or 3 or more sets on the 2 union side, +
i? The line connecting the two anti-vibration plates installed on li is ili.
+i to move in the direction of the principal axis of inertia passing near the heart
iJ? It can effectively absorb the vibration and pitching in the li )
・It is advantageous to effectively absorb directional vibrations and 11-rings.

In addition, an intermediate seat is provided at -1-1, and two vibration dampers are inserted in series. It is said to lower the
The frequency of the resonance point can be lowered, and by eliminating the resonance point within the normal operating speed, the vibration level can be lowered.

Also, it is better to support two vibration isolators in series to reduce the amount of deflection of the vibration isolators than to support them with one spring constant. It will come.

In addition, the anti-vibration system can absorb secondary and tertiary vibrations that could not be absorbed when using conventional balancers to reduce vibrations.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the engine mounted on a walk-behind agricultural machine such as a υ1 turning machine, Figure 2 is a side view of the engine mounted on the engine frame via the vibration isolation frame, and Figure 3 is the vibration isolation frame. Figure 4 is a side view, Figure 5 is a plan view of the anti-vibration frame supported by six anti-vibration frames, and Figure 6 is a plan view of the frame supported by eight anti-vibration brackets. Also side view, No. 7
The figure is a graph showing a comparison of vibration levels when four parallel engines and two vibration-proof rubbers are installed in series. f2) f31 (41 (51... anti-vibration gol, (6)
・・Nlinder block +81 ・Engine frame +91 +Il+・・Intermediate seat flol・・Engine fl11 Front anti-vibration rubber seat +121・・Fujino side rear anti-vibration rubber seat n (281・Work machine side anti-vibration rubber seat

Claims (1)

[Claims] A vibration isolating support section is constructed by installing two vibration isolators in series on both sides of the engine, one above the 7 linder block and one below the 7 linder block.
A vibration-proof support structure for an engine, characterized in that it has one or two sets of cuttings and three or more sets of one set on the side.