JP6655855B2 - Power plant mounting structure - Google Patents

Description

The present invention relates to a power plant mount structure for mounting a power plant serving as a vibration source to a vehicle body-side member in a vehicle such as an automobile.
A power plant is an engine (power generation source) or a unit formed by combining an engine with other devices such as a clutch and a transmission.

A specific example of the power plant mount structure is disclosed in Patent Document 1.
In the structure described in the document, the vibration isolating mount main body is supported by the vehicle body side bracket. The anti-vibration mount main body has a configuration in which a rubber elastic body is interposed inside an outer cylinder whose axial length is the vertical direction, and a connecting member is held by the rubber elastic body. The lower part of the connecting member protrudes below the rubber elastic body, and a power plant side bracket portion to be attached to the power plant is connected to this portion.
According to such a configuration, the power plant is supported by a so-called hanging method, and the rubber elastic body of the vibration isolating mount main body is arranged in each of the vertical direction, the vehicle longitudinal direction, and the vehicle width direction. It can be set to be sufficiently deformed. Further, it is also possible to easily control the spring characteristics by providing a curl portion on the rubber elastic body.

  However, there is still room for improvement in the prior art as described below.

That is, when the power plant is mounted on the vehicle body, it is required to set the rubber elastic center of the vibration isolating mount main body to a low height without impairing the vibration isolating performance due to the specifications of the vehicle and various other reasons. There are cases. For example, when the transmission side of the power plant is supported using the above-described mounting structure, while the engine side of the power plant is supported using another mounting structure, the transmission side is more inertial than the engine side. In order to make the main shaft low and improve vibration isolation, it is required to reduce the height of the rubber elastic center of the vibration isolation mount main body.
On the other hand, in the prior art, as a means for restricting the power plant from rising above a predetermined upper limit height, the power plant side bracket portion and the vibration isolating mount main body portion located above the power plant side bracket portion are provided. A stopper for regulating the upper limit height is provided at the position. The power plant side bracket portion does not rise any further by contacting the stopper portion.
However, when such a means is adopted, the stopper portion is arranged below the vibration isolating mount main body portion, so that the position of the vibration isolating mount main body portion becomes higher by that amount, and the rubber elastic center is also the same. Become higher. Therefore, it is difficult to accurately meet the demand for lowering the rubber elastic center, and there is still room for improvement in this respect.

JP-A-10-169713

The present invention has been conceived under the circumstances as described above, and allows the power plant to appropriately regulate the upper limit height when the power plant vibrates up and down, and at the same time, the It is an object of the present invention to provide a power plant mount structure in which the height of a rubber elastic center can be made lower than before.

  In order to solve the above problems, the present invention takes the following technical measures.

  The power plant mount structure provided by the present invention is such that a rubber elastic body holding a connecting member is interposed inside an outer cylinder whose axial length direction is the vertical direction, and a lower surface side of the rubber elastic body. An anti-vibration mount body having a configuration in which a lower portion of the connecting member is exposed in a protruding or non-projecting state, and a vehicle-body-side bracket portion attached to a vehicle-side member while supporting the anti-vibration mount main body, And a power plant side bracket portion connected to a lower portion of the connection member and being mounted on a power plant, wherein the vehicle body side bracket portion is provided around the outer cylinder. A housing portion having a tubular portion covering the outer cylinder and an upper wall portion connected to an upper portion of the tubular portion and covering the outer cylinder and the rubber elastic body. The upper wall portion of the portion is a stopper portion for regulating the upper limit height for contacting the upper portion of the rubber elastic body when the rubber elastic body rises to a predetermined height or more and preventing the rubber elastic body from rising further. It is characterized by having.

According to such a configuration, the following effects can be obtained.
First, the rise of the rubber elastic body of the vibration isolating mount main body to a predetermined height or more is restricted by using the upper wall portion of the housing portion, and the upper limit height regulation when the power plant vibrates up and down is regulated. It is possible to aim appropriately. On the other hand, unlike the above-mentioned prior art, there is no need to interpose a stopper for regulating the upper limit height between the anti-vibration mount main body and the power plant side bracket. It is possible to make the height of the elastic center lower than in the prior art. Therefore, it is suitable for use under conditions where it is required to reduce the height of the rubber elastic center.
Second, since the periphery of the outer cylinder of the vibration isolating mount main body and the upper side of the outer cylinder and the rubber elastic body are covered by the housing part, for example, hot air blown from a radiator fan is directly applied to the rubber elastic body. It is possible to prevent the rubber elastic body from being thermally damaged by hitting the rubber elastic body. Thus, the effect of protecting the vibration isolating mount main body portion by the housing portion and extending the durable life can be obtained.
Third, by fitting the outer cylinder of the anti-vibration mount main body into the cylindrical portion of the housing part, the anti-vibration mount main body can be easily assembled to the vehicle body side bracket. Therefore, it is easy to manufacture, and it is possible to appropriately avoid a significant increase in manufacturing cost due to the provision of the housing portion.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings.

FIG. 1 is a perspective view of a main part showing an example of a power plant mount structure according to the present invention. It is II-II principal part sectional drawing of FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

A power plant mount structure A shown in FIG. 1 is a structure for attaching a power plant 2 to a side member 1 as a vehicle body-side member provided at a front portion of the vehicle so as to extend in the vehicle front-rear direction. The power plant 2 is, for example, one in which a transmission is assembled to an engine, and has a specification in which the mounting height is set lower on the transmission side than on the engine side. The power plant mount structure A of the present embodiment is used to support the transmission side of the power plant 2.

  In FIG. 2, a power plant mount structure A includes an anti-vibration mount main body 3, a vehicle body side bracket 4 for supporting the anti-vibration mount main body 3 and attaching to the side member 1, and a power plant as shown in FIG. The power plant includes a power plant side bracket 5 connected to the plant 2 via bolts 90.

  In the vibration-isolation mount main body 3, a rubber elastic body 31 is interposed in a metal cylindrical outer cylinder 30 whose axial length direction is the vertical direction, and a connecting member 32 is connected to the rubber elastic body 31. This is the retained configuration. The lower portion 32 a of the connecting member 32 projects below the rubber elastic body 31. A screw hole 32 b having a lower opening shape is provided in a lower portion 32 a of the connecting member 32, and an arm 50 formed at one end of the power plant side bracket 5 is fastened using a bolt 91. The arm section 50 has a configuration in which a rubber coating section 51 is provided on the surface layer. This is useful for preventing the generation of an impact and a collision sound when the arm portion 50 comes into contact with stopper walls 6a and 6b for later-described longitudinal movement restriction. Preferably, the anti-vibration mount main body 3 is configured as an insulator in which the three members of the outer cylinder 30, the rubber elastic body 31, and the connecting member 32 are unitized or modularized, as indicated by a virtual line in FIG. I have. Although illustration is omitted, the rubber elastic body 31 is appropriately provided with a curving portion for controlling a manner of elastic deformation (spring characteristics) of the rubber elastic body 31 with respect to an input.

  The vehicle body side bracket part 4 includes a base plate part 40 fixed on the side member 1 using a bolt 92 or the like, a plurality of support plate parts 41 provided upright on the base plate part 40, and a plurality of these support parts. A cup-shaped housing portion 42 supported by the plate portion 41, and stopper wall portions 6a and 6b for regulating forward and backward movement are provided. These parts are made of metal. The housing portion 42 has a cup shape having a tubular portion 42a fitted to the outer tube 30 and an upper wall portion 42b connected to an upper portion of the tubular portion 42a. The housing portion 42 and the outer cylinder 30 are fixed using a press-fitting means or the like. Preferably, the cylindrical portion 42 a is sized to cover substantially the entire outer peripheral surface of the outer cylinder 30.

  The upper wall portion 42b of the housing portion 42 has an air vent hole 42c, and the other portion covers the upper side of the outer cylinder 30 and the rubber elastic body 31. Of the upper wall portion 42b, the portion immediately above the highest point of the rubber elastic body 31 abuts on the upper part of the rubber elastic body 31 when the rubber elastic body 31 rises above a predetermined height. It is configured as a stopper for restricting the upper limit height for preventing the above-mentioned rise. In a state where the power plant 2 is suspended and supported by the anti-vibration mount body 3, a gap 80 having an appropriate vertical width La is formed between the rubber elastic body 31 and the stopper as shown in FIG. ing. However, when the power plant 2 is not suspended and supported, the rubber elastic body 31 does not receive a downward load, and thus the gap 80 is not formed or is in a minute state.

  The stopper walls 6a and 6b for regulating the forward and backward movement are located on the vehicle front side and the rear side of the arm portion 50 (rubber coating portion 51) of the power plant side bracket 5 with appropriate gaps 81 and 82 therebetween. . The arm portion 50 abuts against the stopper wall portions 6a and 6b, whereby further movement of the arm portion 50 toward the front of the vehicle or movement toward the rear of the vehicle is prevented. The lowering of the arm portion 50 from the predetermined lower limit height is regulated by the contact of the arm portion 50 (rubber coating portion 51) with the base plate portion 40.

  In FIG. 1, a radiator 70 and a radiator fan (not shown) exist in front of the vehicle of the power plant 2, and the radiator fan is located relatively close to the power plant mount structure A. In FIG. 2, a battery 71 is provided above the housing part 42.

  Next, the operation of the power plant mount structure A will be described.

  First, since the upper wall portion 42b of the housing portion 42 is a stopper portion for preventing the rubber elastic body 31 from rising above a predetermined height, the upper limit when the power plant 2 vibrates in the vertical height direction. Height regulation can be appropriately performed. According to the configuration in which the rubber elastic body 31 is brought into contact with the upper wall portion 42b, it is possible to prevent a large impact or a collision sound from being generated when they come into contact. Since the stopper for regulating the upper limit height is formed by using the upper wall portion 42b of the housing portion 42, for example, the upper limit height is set between the vibration isolating mount main body portion 3 and the power plant side bracket portion 5. The height of the rubber elastic center of the anti-vibration mount main body 3 can be reduced as compared with the case where the stopper portion for regulating the height is interposed. When supporting the transmission side of the power plant 2, it may be required to lower the height of the rubber elastic center of the vibration isolating mount main body 3, but the power plant mounting structure A of the present embodiment is not so. It can respond accurately to such demands. Since the arm portion 50 is located below the anti-vibration mount main body portion 3, the structure of the power plant side bracket portion 5 for connecting with the transmission side of the power plant 2 which is usually at a lower position can be simplified. It is possible.

  The housing portion 42 covers the outer cylinder 30 and the rubber elastic body 31 and also serves to protect them. In some cases, hot air may flow from the radiator fan to the position of the power plant mount structure A. The housing portion 42 prevents the hot air from directly hitting the rubber elastic body 31 (a portion not covered by the outer cylinder 30). Also, the function of preventing or suppressing the heat damage of the rubber elastic body 31 is exhibited. The stopper walls 6a and 6b for regulating the forward and backward movement also serve to prevent the hot air from directly flowing to the lower surface of the rubber elastic body 31 and to prevent or suppress heat damage to the rubber elastic body 31. Further, when battery fluid leaks from the battery due to damage to the battery 71 or the like, the housing portion 42 also has a function of preventing the battery fluid from directly splashing on the rubber elastic body 31 or reducing the splashing amount. Therefore, it is preferable in protecting the rubber elastic body 31 and extending the durability life thereof.

  In addition, according to the present embodiment, the vibration isolating mount main body 3 can be easily assembled to the vehicle body side bracket 4 by fitting (including press fitting) the outer cylinder 30 into the housing 42. It is. Therefore, there is no problem that the manufacturing cost is significantly increased.

The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the power plant mount structure according to the present invention can be variously modified within the range intended by the present invention.
The lower portion 32a of the connecting member 32 may be configured to be exposed to the lower surface of the rubber elastic body 31 in a non-projecting state without projecting below the rubber elastic body 31.
The power plant mount structure according to the present invention is not limited to the use for supporting the transmission side of the power plant.
The specific configurations of the vehicle-body-side bracket portion and the power-plant-side bracket portion can be changed as appropriate in accordance with the specifications of these mounting locations.

A Power plant mount structure 1 Side member (body side member)
2 Power plant 3 Anti-vibration mount main body 30 Outer cylinder 31 Rubber elastic body 32 Connection member 32a Lower part (of connection member)
4 Body side bracket part 42 Housing part 42a Cylindrical part (of housing part)
42b Upper wall part (of housing part)
5 Power plant side bracket

Claims (1)

A rubber elastic body that holds the connecting member is interposed inside the outer cylinder whose axial length direction is the vertical direction, and the lower part of the connecting member projects or does not project from the lower surface side of the rubber elastic body. An anti-vibration mount body that is configured to be exposed in
A vehicle-body-side bracket that is attached to a vehicle-body-side member while supporting the vibration-proof mount main body;
A power plant side bracket portion which is connected to a lower portion of the connection member and is intended to be attached to a power plant,
A power plant mounting structure comprising:
The vehicle-body-side bracket portion includes a housing portion having a tubular portion that covers the periphery of the outer tube, and an upper wall portion that is connected to an upper portion of the tubular portion and that covers an upper side of the outer tube and the rubber elastic body. Equipped,
The upper wall portion of the housing portion, when the rubber elastic body rises to a predetermined height or more, a stopper portion for upper limit height regulation that contacts the upper part of the rubber elastic body and prevents further rise. A power plant mounting structure, characterized in that the mounting is performed.

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