JPS6333572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolating device that supports a power unit including an engine, a transmission, etc. on a vehicle body and performs vibration isolation.

Conventional vibration isolators include those shown in Utility Model Application Laid-Open No. 56-67521 and shown in FIG. The conventional vibration isolator shown in FIG.
7 and a movable member 509. The vibration isolator 507 has a vibration isolator 51 between the vehicle body side attachment 511 and the power unit side attachment 513.
5 is integrally provided by vulcanization molding. The movable member 509 is the vibration isolator 50
They face each other so as to maintain a constant gap Cl〓, Cl〓 on both sides of the vibration isolator 7, and are integrally provided with the vehicle body side mounting tool 511 of the vibration isolator. The gap between the vibration isolator 507 and the movable member 509 is formed in advance such that one gap is large and the other gap is small. Such a vibration isolator is installed obliquely between the lower left and right sides of the power unit 3 and the vehicle body when the vehicle body is viewed from the front side, for example. The unit is supported, and the vehicle body side fixture 511 is fixed to the vehicle body. At this time, the movable member 509 facing the vibration isolator 507 with a large gap Cl is placed on the lower side, and the movable member 509 facing with a small gap Cl is placed on the upper side. Placed. Therefore, when the static load of the power unit is applied to the vibration isolating rubber body 515 of the vibration isolator 507, the vibration isolating rubber body 515 is bent toward the lower bound side (hereinafter referred to as the bound side), and the gap Cl on the bound side is The gap Cl〓 on the rebound side becomes almost equal.

By the way, in the state where the vibration isolator is interposed between the vehicle body and the power unit in this way, the reason why the bound side gap Cl〓 and the rebound side gap Cl〓 are made equal is as follows. First, when the vibration isolating rubber body 515 absorbs minute vibrations of the power unit, the vibration isolating rubber body 515 vibrates minutely on the bound side and the rebound side with equal amplitude, so that this minute vibration is not transmitted to the movable member 509. It is necessary to maintain clearances Cl〓 and Cl〓 on both the bounce side and rebound side to prevent this. However, for example, when the power unit rolls and the vibration isolating rubber body 515 tries to deflect greatly toward the bounce side or rebound side,
In order to effectively prevent this, it is desirable to make both the gaps Cl〓, Cl〓 as small as possible and to reduce the displacement of the power unit. Therefore, considering the amplitude of the minute vibrations mentioned above during vibration absorption, both gaps Cl〓, Cl〓
are set so that they are equal when subjected to the static load of the power unit. Therefore, the condition that both gaps are equal is extremely important in order to effectively prevent large deflection of the vibration isolating rubber body 515 toward the bounce side and rebound side, and to effectively absorb minute vibrations of the power unit. should be said.

However, when a vibration isolator is interposed between the vehicle body and the power unit in this way, the static load of the power unit is taken into consideration and the gaps Cl and Cl are adjusted so that they are equal. Even if a large and small difference is set in advance for Cl and Cl, the problems that the gaps Cl and Cl are not necessarily equal and unstable during interposition often occur. This is because even if the large and small gaps Cl〓 and Cl〓 are uniformly set by predicting the amount of deflection of the vibration isolating rubber body 515 due to the static load of the power unit, the spring constant of the vibration isolating rubber body 515 is This is due to the fact that there is some variation between individual vibration isolators, and that the static load of the power unit varies between individual power units.

This invention was devised in view of the above problems, and even if there are variations in the spring constant of the vibration isolator or the static load of the power unit, the vibration isolator and movable member are uniformly set during molding. To provide a vibration isolator that can maintain the gap between the two vibration isolators even when the vibration isolator is interposed, and that can obtain stable quality with each vibration isolator.

In order to achieve this object, the present invention connects a vehicle body and a power unit via an elastic part, and includes a vibration isolator that supports the power unit, and a vibration isolator that faces the side of the vibration isolator and a movable member that is movable relative to the vibration isolator in a direction in which the vibration isolator is displaced by the static load of the power unit; and a fixture that fixes the movable member to the vehicle body in the displaced state of the movable member.

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

As shown in FIG. 2, the vibration isolating device according to the embodiment of the present invention is fixed to the left and right sides (left and right in FIG. 2) of a frame 1 of a vehicle body, for example, when viewed from the front side of the vehicle body (not shown). , are set diagonally so that they face inward from each other. A power unit 3 consisting of an engine, a transmission, etc. is supported by the vibration isolating device fixed to the left and right lower brackets 5.

The vibration isolating device thus interposed between the vehicle body and the power unit 3 is constructed as shown in FIG.

This vibration isolator is explained with the vibration isolator 7 removed from between the frame 1 and the power unit 3.
and a movable member 9.

The vibration isolator 7 is provided between the vehicle body and the power unit 3 to support the static load of the power unit 3. This vibration isolator 7 is attached to a vehicle body side mounting tool 11.
A vibration isolating rubber body 15, which is an elastic portion, is integrally provided between the power unit side mounting member 13 and the power unit side fixture 13 by vulcanization molding. Said vehicle body side mounting tool 1
1 has a rectangular plate shape, and is provided with a circular depression 17 protruding downward (diagonally downward to the right in FIG. 3), which is the mounting side of the vehicle body to the frame 1, approximately in the center. (See Figure 4). The surface of the recessed portion 17 on the frame 1 side is formed substantially flat. A through hole 17a is provided approximately in the center of this recessed portion 17, and a bolt 19 is inserted from this through hole 17a.
The threaded portion of is protruded toward the frame 1 side. The power unit side fixture 13 has a substantially rectangular plate shape, and rising portions 13a on the bound side and the rebound side are integrally bent in the inclined direction (see FIG. 4). A through hole 13b is provided approximately in the center of this power unit side fixture 13, and from this through hole 13b, the threaded portion of the bolt 21 is connected to the upper side (in Fig. 3) which is the mounting side to the power unit 3. It protrudes to the left (upper left side).

The movable member 9 is provided facing the side portion of the vibration isolator 7. Specifically, a bound side stopper section 9a and a rebound side stopper section 9b are provided on the bounce side and the rebound side of the vibration isolator 7. These stopper portions 9a and 9b are integrally bent and formed with a sliding portion 9C arranged in parallel on the frame 1 side of the vehicle body side attachment 11 of the vibration isolator 7 using a plate-like member. (See Figure 4). A long hole 23 extending toward the bound side and the rebound side is provided approximately at the center of the sliding portion 9C. The short radius of the elongated hole 23 is formed to be slightly larger than the outer circumferential radius of the recessed portion 17 of the vehicle body side attachment 11. Therefore, the movable member 9 is configured to be able to freely slide in the direction toward and away from the side portion of the vibration isolator 7, in other words, in the direction of the bound side and the rebound side. On the inside of both the stopper parts 9a and 9b, in other words, on the surface facing the vibration isolator 7, there are stopper rubber bodies 9d,
9e is vulcanized and molded.

An elastic member 25 is provided between the movable member 9 and the vibration isolator 7. This elastic member 25 is
It is formed of a low-rigidity rubber body, and the upper ends of the vibration isolating rubber body 15 and the stopper rubber bodies 9d and 9e on the power unit 3 side are connected to each other in a bridge shape. This elastic member 25 has both stoppers 9
It is arranged so as to be substantially perpendicular to a and 9b. In this state, in the sliding state of the movable member 9, between the vibration isolator 7 and the movable member 9, in other words,
The vibration isolating rubber body 15 and the stopper rubber bodies 9d, 9
Constant gaps Cl〓 and Cl〓 are maintained between the two and e. In this embodiment, both bound side gaps Cl〓 and rebound side gaps Cl〓 are formed equally, and are minimized in consideration of the amplitude when the vibration isolating rubber body 15 absorbs the vibration of the power unit 3 and vibrates slightly. It is set.

A bolt 27 of a fixture 27 is attached to the movable member 9.
a is installed. The bolts 27a are attached to the sliding portion 9C of the movable member 9 at positions on both sides of the elongated hole 23, passing through the sliding portion 9C, and their threaded portions protrude toward the frame 1 side of the vehicle body.
And the frame 1 of the recessed part 17 of the vibration isolator 7
When the side surface and the frame 1 side surface of the sliding portion 9C of the movable member 9 are flush as shown in FIG. have. And this bolt 27a
is fixed to the frame 1 by a nut (not shown) of the fixture 27 at a predetermined sliding position of the movable member 9 due to the static load of the power unit. This makes it possible to prevent deflection beyond a predetermined value toward the bounce side and rebound side. Incidentally, since the bolt 27a also follows when the movable member 9 slides, it goes without saying that a long hole (not shown) is provided in the frame 1 to allow the bolt 27a to follow.

A plate 29 that slidably supports the movable member 9 is provided on the frame 1 side of the movable member 9. This plate 29 has a substantially rectangular shape and is in contact with the frame 1 side of the sliding portion 9C of the movable member 9. Approximately in the center of this plate 29 is a hole 2 through which the bolt 19 of the vibration isolator 7 passes.
9a, and a long hole 29b through which the bolt 27a of the fixture 27 passes is provided on the bound side and rebound side of this hole 29a. Therefore, when the bolt 27a follows the sliding movement of the movable member 9, it can move within the elongated hole 29b. Note that this plate 29 does not necessarily need to be provided.

Next, the operation of the above embodiment will be described.

First, the vibration isolator formed as shown in Fig. 3 is
Fix it to frame 1 of the vehicle body. That is, the bolt 19 of the vibration isolator 7 is inserted into a mounting hole (not shown) of the frame 1 and fixed with a nut (not shown). At this time, the vibration isolating device is set diagonally, for example, on the left and right sides of the frame 1 of the vehicle body when viewed from the front side, as shown in FIG. The stopper portions 9b are arranged on the inclined upper side. The bolt 27a of the fixture 27 is passed through a long hole (not shown) in the frame 1, and the movable member 9 slides toward the bound side and rebound side while its sliding portion 9C is supported by the plate 29. It has become freely possible.

In this state, the power unit 3 is supported by the vibration isolator 7 as shown in FIG. That is,
Support the bracket 5 of the power unit 3 on the power unit side fixture 13, and tighten the nut (not shown).
Fasten and fix. Therefore, power unit 3
The static load is applied to the vibration isolating rubber body 15 via the bracket 5 and the power unit side fixture 13. Then, the vibration isolating rubber body 15 bends toward the bound side. This deflection causes the movable member 9 to slide toward the bound side via the elastic member 25. This effect will become clearer when referring to FIG. FIG. 5 shows a principle diagram, and corresponding components are designated by the same reference numerals. When the movable member 9 slides toward the bound side, the elongated hole 23 of the sliding portion 9C prevents the sliding of the movable member from being blocked by the recessed portion 17, and the bolt 27a of the fixture 27 is secured to the plate. 29 long hole 2
9b, and moves within the elongated hole of the frame 1. When the vibration isolating rubber body 15 comes to rest, the movable member 9 also comes to rest, and the bound side gap Cl〓 and the rebound side gap Cl〓 between the vibration isolator 7 and the movable member 9 are almost the same as during molding. The state is maintained, and both gaps Cl〓 and Cl〓 are almost the same. In this state, if a nut (not shown) is fastened to the bolt 27a of the fixture 27, the installation of the vibration isolator is completed. When the power unit 3 vibrates minutely, the gaps on the bound side and the rebound side are almost equal, so the power unit 3
contacts only one stopper, so that minute vibrations are not transmitted to the frame 1, and the vibration isolators 15 absorb minute vibrations, improving vibration isolation. Further, although the vibration-proof rubber body 15 slightly vibrates, the elastic member 25 has low rigidity, so that the vibration to the movable member 9 is effectively absorbed. When the vibration isolator 7 tries to deflect greatly toward the bound side or the rebound side, the elastic member 25 easily deflects and the vibration isolator 15 comes into contact with the stopper rubber bodies 9d and 9e, causing the movable member 9 to deflect more than a predetermined amount. This is prevented by stopper portions 9a and 9b.

Furthermore, if the vibration isolating rubber body 15 undergoes so-called fatigue due to changes over time, and the spring constant changes and the bound side gap Cl _B and the rebound side gap Cl 〓 change, the bolt 27a of the fixture 27 When the nut 27a is loosened, the gaps Cl and Cl are automatically adjusted by the same action as described above. After that, if you retighten the nut, it will return to its original state and readjustment is easy.

FIG. 6 shows a second embodiment, in which frictional force is utilized as the elastic member 125. On the bounce side and rebound side of the vibration isolating rubber body 15, an appropriate number (third in FIG. 6) of fin-shaped protrusions 125a are provided closer to the power unit side.
is provided to protrude toward the bound side stopper section 9a and the rebound side stopper section 9b. and,
Opposed to this fin-like protrusion 125a,
A suitable number (four in FIG. 6) of fin-shaped protrusions 125b are provided to protrude toward the vibration isolator 7 on the bound side stopper part 9a and the rebound side stopper part 9b. These protrusions 125a and 125b have their tip ends fitted between the mating protrusions, and a bounce side gap Cl〓 and a rebound side gap Cl〓 between the stopper rubber bodies 109d and 109e and the protrusion 125a.
is formed. Note that the other configurations are almost the same as those of the above embodiment, so they are denoted by the same reference numerals and the explanation will be omitted.

In this embodiment, when the vibration isolating rubber body 15 is bent toward the bound side due to the static load of the power unit 3, the movable member 9 is slid through the frictional force between the protrusions 125a and 125b, and the bound side gap Cl〓, Automatic adjustment is performed to keep the rebound gap Cl〓 constant. The vibration isolator 15 absorbs the minute vibrations of the power unit 3, and the fitting between the protrusions 125a and 125b slides together, so that the minute vibrations of the vibration isolator 7 are not transmitted to the movable member 9. When trying to bend greatly toward the bounce side or rebound side, use the protrusion 125.
a butts against the stopper rubber bodies 109d and 109e and is prevented from bending. Note that the other functions are the same as those of the above embodiment, so the explanation will be omitted.

FIG. 7 shows a third embodiment, in which a stopper rubber body 225 is used as the elastic member 225.
This utilizes the low rigidity due to shear deformation of the stopper rubber bodies 209d and 209e.
209e is in contact with the vibration isolator before the power unit is attached. Stopper rubber body 209
d and 209e are formed in a chevron-shaped cross section that gradually tapers toward the vibration isolator 7 side, and the top portion thereof is in contact with the vibration isolator rubber body of the vibration isolator 7. The stopper rubber bodies 209d and 209e have bound side gaps.
Cl〓Rebound side gap Cl〓 is provided. Note that the other configurations are almost the same as those of the above embodiment, so they are denoted by the same reference numerals and the explanation will be omitted.

In this embodiment, when the vibration isolating rubber body 15 is bent toward the bound side due to the static load of the power unit 3, the movable member 9 is slid through the stopper rubber bodies 209d and 209e, and the bounce side gap Cl〓 and the rebound side gap Cl〓 Automatic adjustment is performed to keep 〓 constant. When absorbing vibrations of the power unit 3, the stopper rubber bodies 209d and 209e close the gaps Cl〓, Cl〓
Since the vibration isolating rubber body 15 absorbs minute vibrations by slightly deforming it in the direction of crushing, the vibrations are not transmitted to the movable member 9. The vibration isolator 7 is on the bounce side,
When a large deflection toward the rebound side is attempted, the bounce side gap Cl〓 and the rebound side gap Cl〓 collapse to prevent the deflection. Note that the other functions are the same as those of the above embodiment, so the explanation will be omitted.

Note that the present invention is not limited to the above embodiments, and the elastic member having a rigidity equal to or lower than that of the vibration isolator maintains a gap between the vibration isolator and the movable member when the movable member slides, Further, when absorbing vibrations of the power unit, the location and number of vibration isolators are not limited as long as the minute vibrations of the vibration isolators are not transmitted to the movable member.
Therefore, the elastic member may be provided perpendicularly to the paper plane in the figure so that the load of the power unit is applied to the elastic member as a shearing load. In this case, the vibration damping properties are further improved. Furthermore, it may be provided only on the rebound side.

As described above, the present invention connects a vehicle body and a power unit via an elastic part, and includes a vibration isolator that supports the power unit, and a vibration isolator that faces the side of the vibration isolator and that supports the power unit. a movable member that is movable relative to the vibration isolator in a direction in which the vibration isolator is displaced by a static load of the vibration isolator; Since the device includes an elastic member to be connected and a fixture to fix the movable member to the vehicle body in a displaced state, the vibration isolator can be inserted between the vehicle body and the power unit without fixing the movable member. If the vibration isolator is interposed, when the vibration isolator is deflected in the lateral direction due to the static load of the power unit, the movable member will follow the deflection of the vibration isolator and slide via the low-rigidity elastic member. The gap between the movable member and the movable member can be maintained almost as it was when the vibration isolator was molded. Therefore, if the movable member is fixed with a fixture as it is, even if there are variations in the elastic modulus of the vibration isolator and variations in the load of the power unit, the gap between the vibration isolator and the movable member will be reduced when the power unit is under static load. can be kept constant, and vibration isolation against minute vibrations can be improved. Also,
When the vibration isolator weakens over time and the gap changes, the fixing device can be loosened and tightened to automatically return to the original gap, making maintenance easy.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional vibration isolator;
The figure is an explanatory diagram showing the interposed state of the vibration isolator, and FIG. 3 is a sectional view showing the vibration isolator according to an embodiment of the present invention.
FIG. 4 is an exploded perspective view showing movable members, etc., FIG. 5 is a principle diagram, FIG. 6 is a sectional view showing a vibration isolator according to a second embodiment of the present invention, and FIG. 7 is a third embodiment of a vibration isolator according to the present invention. It is a sectional view showing the vibration isolator of an example. Explanation of the symbols of the main parts in the figure, 1... Frame (vehicle body), 3... Power unit, 7... Vibration isolator, 9... Movable member, 15... Vibration isolating rubber body (elastic part), 25, 125, 225...Elastic member, 27
……Fixture.

Claims (1)

[Claims] 1. A vibration isolator that connects the vehicle body and the power unit via an elastic part and supports the power unit, and faces the side of the vibration isolator, and the vibration isolator is supported by the static load of the power unit. a movable member that is movable relative to the vibration isolator in a direction of displacement; an elastic member that has a smaller elastic coefficient than the elastic portion of the vibration isolator and connects the movable member and the vibration isolator; A vibration isolator comprising: a fixture for fixing a movable member to a vehicle body in a displaced state of the member.