JPH05418Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an engine mount device for vibration-proofly supporting an engine from a vehicle body in a vehicle such as an automobile.

[Prior Art] Generally, in a vehicle such as an automobile, the engine has two ends along the rolling axis, and
The parts on both sides of the rolling axis are each supported by anti-vibration rubber devices from the vehicle body in a vibration-isolating manner. In many cases, the anti-vibration rubber devices installed at both ends along the rolling axis are called "load-carrying anti-vibration rubber devices" that essentially bear the engine load (engine weight). The anti-vibration rubber device installed in the part of
It is said to be a "non-load bearing vibration isolating rubber device" that does not actually bear the engine load. Such a non-load-bearing anti-vibration rubber device serves as a buffer against the undesirable increase in drag forces exerted on the engine when the engine rolls about the rolling axis and deviates from its standard position relative to the vehicle body. Acts as a deterrent.

In a horizontally mounted engine in which the rolling axis of the engine extends in the lateral direction of the vehicle, side-mounted anti-vibration rubber devices located on both sides of the vehicle body when viewed along the longitudinal direction of the vehicle are equipped with load-bearing anti-vibration rubber devices. The front mount vibration isolating rubber device and the rear mount vibration isolating device located in front and behind the engine when viewed along the longitudinal direction of the vehicle body are non-load bearing vibration isolating rubber devices. This type of vehicle engine mount device is shown in, for example, Japanese Patent Laid-Open No. 151637/1983.

[Problem to be solved by the invention] The non-load bearing vibration isolating rubber device in the engine mount device as described above is designed so that it does not receive the engine load and no substantial load is applied when the engine is stopped. has been done.

However, in reality, if you look at the state after a certain period of time has passed after the engine was installed, you will find that a load is being applied to the non-load bearing vibration isolating rubber device. The cause of this is that the load-carrying anti-vibration rubber device creeps due to the engine load.
This is because the supporting position of the engine sinks beyond the expected amount of elastic deformation of the load-bearing vibration-isolating rubber device, which causes unexpected deformation of the non-load-bearing vibration-proofing rubber device. In this case, in a non-load bearing vibration isolating rubber device with a stopper, the stopper clearance may be distorted, and there is a possibility that the vibration damping support performance of the engine may be reduced. In addition, even if a non-load bearing vibration isolating rubber device is originally designed under the condition that no tensile load acts on the rubber-like elastic member, it is possible for the rubber-like elastic member to be locally subjected to a continuous tensile load. This may impair the durability of the rubber-like elastic member.

However, the creep of the load bearing vibration isolating rubber device in the engine mount device as described above is
Normally, after the engine mount device takes on the engine load, it becomes saturated in a relatively short time of several tens of hours, and thereafter the amount of creep remains stable and does not substantially increase any further.

The present invention has focused on this and aims to provide an improved engine mount device for a vehicle that solves the above-mentioned problems regarding the durability of non-load bearing vibration isolating rubber devices.

[Means for Solving the Problems] According to the present invention, the above-mentioned object is to provide a load-bearing anti-vibration rubber device that substantially bears the engine load, and a load-bearing anti-vibration rubber device that does not substantially bear the engine load, but that the engine is connected to the vehicle body. In a vehicle engine mount device that vibration-proofly supports an engine from a vehicle body by a load-bearing non-vibration-isolating rubber device that generates a drag force when the load-bearing rubber device deviates from a standard position, the load-bearing non-vibration-proof rubber device The non-load-bearing anti-vibration rubber has two frame bodies that are connected to each other, and a rubber-like elastic member that is located between the two frame bodies and connects them to each other. The rubber-like elastic member of the device is offset in a direction opposite to the direction in which the engine load is applied by an offset amount corresponding to the saturation stable creep amount of the load-bearing vibration-proofing rubber device from a standard shape on which no tensile load is applied locally. This is achieved by a vehicle engine mount device characterized by:

[Operations and effects of the invention] According to the above-described configuration, when the creep of the load-bearing vibration isolating rubber device is saturated, the support position of the engine sinks due to this creep, so that the load-bearing non-vibration prevention device is activated immediately after the engine is assembled. The offset from the standard shape previously given to the rubber-like elastic member of the vibration rubber device disappears, and the stopper clearance of the non-load bearing vibration isolating rubber device becomes the optimum value over a long period of use thereafter. This allows the load-carrying vibration isolator to be maintained at an optimal value, and also prevents tensile loads from acting locally on the rubber-like elastic members of the non-load-carrying vibration isolator, thereby improving its durability. It is possible to prevent the decline.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows one embodiment of a vehicle engine mount device to which the present invention is applied. In Fig. 1, numeral 10 indicates an engine, and numeral 12 indicates a transmission. A front mount anti-vibration rubber device 18 and a rear-mount anti-vibration rubber device are supported on the vehicle body 50 in a vibration-isolating manner by the mount anti-vibration rubber devices 14 and 16, and are non-load bearing anti-vibration rubber devices on both sides of the rolling axis. 20 to the vehicle body 50 to prevent excessive rolling.

One embodiment of the front mount rubber isolator 18 or the rear mount rubber isolator 20 is a second
As shown in the figure. In this embodiment, as shown in the figure,
Two frames 22 and 24, a rubber-like elastic member 26 provided between these frames to connect them to each other, and stopper members 28 and 30 attached to each of the frames 22 and 24. have. The anti-vibration rubber device of this embodiment is configured as a square anti-vibration rubber device. The frame body 22 is connected to a bracket 34 by bolts 32, and the bracket 34
is fixed to the outer wall of the engine 10 with bolts 36. The frame body 24 is connected to a bracket 40 by bolts 38, and the bracket 40 is fixed to the vehicle body 50 by bolts 42.

The standard form when the front or rear mount vibration isolating device 18 or 20 is in a no-load state is the third form.
This is the state shown in the figure, and in this state, neither compressive load nor tensile load is acting on the local parts P ₁ , P ₂ , P ₃ , and P ₄ of the rubber-like elastic member. As shown in FIG. 1, the engine is mounted in a state in which the engine is supported relative to the vehicle body by two load-carrying side-mounted vibration isolating devices 14 and 16 and non-load-carrying front and rear-mounted vibration isolating devices 18 and 20. When the engine is assembled by the device, that is, when the fabrication of the engine mount is completed, the front or rear mount vibration isolating device 18 or 20
Compared to the standard form shown in FIG. 3, as shown in FIG. 2, the frame body 22 on the engine side is shown by arrow R in the figure with respect to the frame body 24 on the vehicle body side. It is in a state where it is offset by a predetermined amount S corresponding to the saturation stable creep amount of the side mount vibration isolating rubber devices 14 and 16, which are load bearing vibration isolating rubber devices, in a direction opposite to the direction in which the engine load is applied.

As described above, immediately after the engine is assembled, the front mount rubber isolating device 18 or the rear mount rubber isolating device 20 is in an offset state as shown in FIG.
Although the stopper clearance with respect to 0 is an inappropriate value biased to one side, when the creep of the side-mounted vibration isolating rubber devices 14 and 16 reaches a saturated and stable state several tens of hours after the engine is assembled, As the engine support position sinks due to the creep, the frame body 22 is displaced in the engine load action direction with respect to the frame body 24, and the above-mentioned offset disappears, and as shown in FIG. The relative position becomes correct, and the stopper clearances A and B both reach their optimum values.

As in conventional non-load bearing vibration isolating rubber devices, if the above-mentioned offset is not provided in advance when manufacturing the vibration isolating rubber device, when the load bearing vibration isolating rubber device is in a stable state of creep saturation, as shown in Fig. 4. As shown, an offset in the opposite direction occurs in the non-load bearing vibration isolating rubber device, and a compressive load acts on local parts P ₁ and P ₄ of the rubber-like elastic member, and local parts P ₂ and
A tensile load, which is disadvantageous to the durability of rubber, acts on P ₃ . The durability of the rubber-like elastic member in the tensile load acting portion is significantly impaired. In the non-load bearing vibration isolating rubber device according to the present invention as described above,
A tensile load that is disadvantageous to the durability of the rubber does not act on any of the local parts _P1 to _P4 , and a decrease in the durability of the rubber-like elastic member is avoided.

FIGS. 5 and 6 show another embodiment of the non-load bearing vibration isolating rubber device in the vehicle engine mount device according to the present invention. FIG. 5 shows the state immediately after the engine is assembled, and FIG. 6 shows the state after the load-carrying anti-vibration rubber device has stabilized to creep saturation. In FIGS. 5 and 6, the parts corresponding to FIGS. 2 and 3 are designated by the same reference numerals as those in FIGS. 2 and 3.

The vibration isolating rubber device in this embodiment does not have a stopper mechanism, but the frame bodies 22 and 2
Similarly to the embodiments shown in FIG. 2 and FIG.

Therefore, in this embodiment as well, the same effect as the above-described embodiment shown in FIGS. 2 and 3 can be obtained regarding the durability of the rubber-like elastic member 26.

FIGS. 7 and 8 show still another embodiment of the non-load bearing vibration isolating rubber device in the vehicle engine mount device according to the present invention. 7th
The load-bearing non-vibration rubber device shown in FIG.
A cylindrical body side frame body (outer cylinder) 52 is fixedly connected to the car body 50 by bolts 62, and a cylindrical engine side frame body (inner cylinder) is fixedly connected to the engine outer wall by a connection structure (not shown). tube) 54,
It has a cylindrical rubber elastic member 56 provided surrounding the engine side frame 54 and a plurality of rubber connecting bridges 58 that connect the rubber elastic member 56 and the vehicle body side frame 52 to each other. ing.

As shown in FIG. 7, this cylindrical anti-vibration rubber device has an engine side frame 54 applied to a vehicle body side frame 52 in a direction opposite to the direction in which the engine load is applied, which is indicated by an arrow R in the figure. It is manufactured by being offset by a predetermined amount S corresponding to the saturation stable creep amount of the load bearing vibration isolating rubber device.

Therefore, in this embodiment as well, immediately after the engine is assembled, the cylindrical vibration isolating rubber device is in an offset state as shown in FIG. 7, and the stopper clearance is on one side. Although this is an inappropriate value that is biased towards
is displaced in the engine load action direction with respect to the vehicle side frame 52, and as shown in FIG. 8, the offset between the two disappears, and the gap between the rubber-like elastic member 56 and the vehicle body side frame 52 is is uniform over its entire circumference, and both stopper clearances A and B are at their optimum values.

FIGS. 9 and 10 show still another embodiment of the non-load bearing vibration isolating rubber device in the vehicle engine mount device according to the present invention. FIG. 9 shows the state immediately after the engine is assembled, and FIG. 10 shows the state when the creep of the load-bearing vibration isolating rubber device is saturated and stabilized. In FIGS. 9 and 10, parts corresponding to FIGS. 7 and 8 are designated by the same reference numerals as those in FIGS. 7 and 8. In this embodiment, the vehicle body side frame body 52 and the engine side frame body 54 are connected to each other by a bridge-like rubber-like elastic member 64 extending as a bridge between them. Vehicle side frame body 5
2, there are a vehicle body side frame body 52 and an engine side frame body 5.
A stopper rubber 66 is attached for regulating the amount of relative displacement in the radial direction with respect to 4.

In this embodiment as well, the cylindrical vibration isolating rubber device has an engine side frame 54 that carries a load in a direction opposite to the direction in which the engine load is applied to the vehicle body side frame 52, which is indicated by the arrow R in the figure. It is manufactured by being offset by a predetermined amount S corresponding to the saturation stable creep amount of the vibration isolating rubber device.

Therefore, in this embodiment as well, immediately after the engine is assembled, the cylindrical vibration isolating rubber device is in an offset state as shown in FIG. 9, and the stopper clearance is on one side. Although this is an inappropriate value that is biased towards The frame body 54 is displaced in the engine load acting direction with respect to the vehicle body side frame body 52,
As shown in FIG. 10, these two offsets disappear, and both stopper clearances A and B reach their optimum values.

Although the present invention has been described in detail with respect to specific embodiments above, it is understood that the present invention is not limited to these and that various embodiments are possible within the scope of the present invention. This will be obvious to businesses.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the vehicle engine mount device according to the present invention, and FIGS. 2 and 3 show the vehicle engine mount device according to the present invention as a non-load-bearing vibration isolating rubber device. FIG. 4 is a side view showing one embodiment of the rectangular anti-vibration rubber device used, and FIG. FIG. 6 is a side view showing another embodiment of a rectangular anti-vibration rubber device used as a non-load-bearing anti-vibration rubber device in a vehicle engine mount device according to the present invention, and FIGS. 7 and 8 are A side view showing one embodiment of a cylindrical anti-vibration rubber device used as a non-load-bearing anti-vibration rubber device in a vehicle engine mount device according to the present invention, FIG. 9 and FIG. FIG. 7 is a side view showing another embodiment of a cylindrical vibration isolating rubber device used as a non-load bearing vibration isolating rubber device in an engine mount device. 10...engine, 12...transmission, 14,
16... Side mount anti-vibration rubber device, 18...
Front mount anti-vibration rubber device, 20... Rear mount anti-vibration rubber device, 22, 24... Frame, 26
... Rubber-like elastic member, 28, 30 ... Stopper member, 32 ... Bolt, 34 ... Bracket, 3
6, 38... Bolt, 40... Bracket, 42
... Bolt, 50 ... Vehicle body, 52 ... Body side frame, 54 ... Engine side frame, 56 ... Rubber-like elastic member, 58 ... Connection bridge, 60 ... Bracket, 62 ... Bolt, 64 ...Rubber-like elastic member, 66...Stopper rubber.

Claims (1)

[Scope of utility model registration request] A load-bearing anti-vibration rubber device that substantially takes on the engine load, and a non-load-carrying anti-vibration rubber device that does not take on the engine load but generates a drag force when the engine deviates from its standard position with respect to the vehicle body. In a vehicle engine mount device for vibration-proofly supporting an engine from a vehicle body, the load-bearing non-vibration isolating rubber device is provided between two frame bodies connected to the engine and the vehicle body, respectively, and between the two frame bodies to connect them to each other. and a connecting rubber-like elastic member, and the rubber-like elastic member of the non-load-bearing vibration isolating rubber device immediately after the engine is assembled with the engine mount device has a standard shape in which no tensile load is locally applied, and the rubber-like elastic member has a rubber-like elastic member that is connected to the load-bearing member. An engine mount device for a vehicle, characterized in that the device is offset in a direction opposite to the engine load acting direction by an offset amount corresponding to a saturated stable creep amount of a vibration isolating rubber device.