JP2006256495A - Mount device of powertrain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mount device of a powertrain efficiently suppressing pitching oscillation by simple and inexpensive constitution. <P>SOLUTION: The mount device has a supporting part of 10m and a supporting part of 10n located apart from the supporting part of 10m, and has a rear differential causing oscillation displacing the supporting parts 10m and 10n mutually in opposite directions with a position between the supporting part of 10m and the supporting part of 10n as a center and elastic rubbers 25, 35 deformed by oscillation of the rear differential, and has mounts 21, 31 arranged respectively between a main body of a vehicle and the supporting parts 10m and 10n. Liquid chambers 22, 32 having volumes varied by a deformation of the elastic rubbers 25, 35 and sealing a liquid are respectively formed in a mount 21 and a mount 31. The mount device is provided with a pipe 41 communicating with the liquid chamber 22 and the liquid chamber 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention generally relates to a powertrain mounting device, and more particularly to a differential (differential device) mounting device.

  Regarding a conventional power train mounting device, for example, Japanese Patent Application Laid-Open No. 5-272572 discloses a power unit mounting device for the purpose of enhancing the absorption performance against medium and high frequency vibrations and enhancing the response of the actuator ( Patent Document 1). The mounting device disclosed in Patent Document 1 is mounted between a power unit of an automobile and a body frame.

The mount device is formed with a main chamber and a sub chamber filled with an incompressible fluid. The main chamber and the sub chamber communicate with each other through an orifice. The mount device is further provided with a solenoid actuator. The actuator includes a mover and a solenoid coil connected to the control device. The mover is driven so as to absorb or attenuate the vibration of the power unit when a drive current is supplied from the control device to the solenoid coil.
Japanese Patent Laid-Open No. 5-272572

  Pitching vibration that vibrates in the front-rear direction of the vehicle is generated in the differential mounted on the vehicle. In order to effectively suppress this pitching vibration, it is necessary to provide at least two mounts differentially. However, since an active mount having an actuator function is expensive, if mounting devices as disclosed in Patent Document 1 are provided at a plurality of locations, the manufacturing cost increases.

  On the other hand, in a conventional liquid ring mount having a plurality of liquid chambers communicated with each other by an orifice, the damping force against vibration can be improved in a specific frequency region by changing the specifications of the orifice and the liquid chamber. However, when the frequency of the pitching vibration changes over a wide range, it is difficult to sufficiently suppress the vibration. In addition, in the conventional mount using elastic rubber, a certain degree of characteristics can be adjusted by the shape of the scoop (gap) provided in the rubber. However, basically, a low spring coefficient is obtained for low-frequency vibrations and a high spring coefficient is obtained for high-frequency vibrations, which is contrary to the required spring characteristics. For this reason, it is difficult to sufficiently suppress the pitching vibration.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, and to provide a powertrain mounting device that effectively suppresses pitching vibration with a simple and inexpensive configuration.

  The powertrain mounting device according to the present invention has a first support portion and a second support portion located away from the first support portion, and is between the first and second support portions. A power train that generates vibrations in which the first and second support portions are displaced in opposite directions with respect to the position; an elastic member that is deformed by the vibration of the power train; the vehicle main body; and the first and second A first mount and a second mount disposed between the support and the support; The first and second mounts are respectively formed with first and second liquid chambers whose volumes change with deformation of the elastic member and in which liquid is sealed. The powertrain mounting device further includes a pipe for communicating between the first liquid chamber and the second liquid chamber.

  According to the power train mounting apparatus configured as described above, the volumes of the first and second liquid chambers change in each of the first and second mounts when the power train vibrates. Accordingly, the liquid in each liquid chamber is compressed, and a force in a direction that prevents displacement of the first and second support portions acts on the power train from the first and second mounts. At this time, if there is a difference between the displacement amounts of the first and second support portions, an appropriate amount of liquid moves from one liquid chamber to the other liquid chamber through the pipe. For this reason, even if the center position of vibration between the first and second support portions continues to change, it is possible to continue applying force to the first and second support portions with an appropriate balance. Therefore, according to the present invention, the vibration of the power train can be effectively suppressed with a simple and inexpensive configuration of the mount in which the liquid chamber is formed and the piping for communicating between the liquid chambers.

  Preferably, the power train further includes a plurality of support portions. A mount in which a liquid chamber is formed is disposed between the vehicle main body and each of the plurality of support portions, and the liquid chambers communicate with each other by piping. According to the power train mounting apparatus configured as described above, a force in the direction of preventing displacement can be applied to a larger number of support portions, so that vibration of the power train can be further effectively suppressed.

  As described above, according to the present invention, it is possible to provide a powertrain mounting device that effectively suppresses pitching vibration with a simple and inexpensive configuration.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a differential mounting apparatus according to an embodiment of the present invention. In the figure, a rear differential provided on a rear wheel drive shaft of an FR (front engine rear wheel drive) vehicle is shown.

  Referring to FIG. 1, a rear differential 10 is connected to a propeller shaft 12 extending in the front-rear direction of the vehicle indicated by an arrow 101 and a rear drive shaft 13 provided with a rear wheel and extending in the left-right direction of the vehicle. . The rear differential 10 has a support portion 10m provided immediately after the position where the propeller shaft 12 is coupled, and a support portion 10n provided at the rear end of the rear differential 10. The support portion 10m and the support portion 10n are separated in the front-rear direction of the vehicle. The rear drive shaft 13 is connected to the rear differential 10 between the support portion 10m and the support portion 10n.

  The support portion 10m is attached to the mount bracket 17 on the vehicle main body side via the mount 21. The support portion 10 n is attached to the suspension member 16 on the vehicle main body side via the mount 31. The mount 21 is disposed vertically downward with respect to the support portion 10m, and the mount 31 is disposed vertically upward with respect to the support portion 10n. That is, the mounts 21 and 31 are arranged so as to be positioned on opposite sides of the rear differential 10 in the vertical direction.

  FIG. 2 is a side view of the mounting device along the line II-II in FIG. FIG. 3 is an enlarged cross-sectional view of the mount in FIG. 2 and 3, the mount 21 includes a top 24 fixed to the support portion 10m, a bottom 23 positioned away from the top 24 and fixed to the mount bracket 17, and a top 24 and a bottom 23. And an elastic rubber 25 that extends in a cylindrical shape and connects the two. The elastic rubber 25 is formed so as to expand in diameter from the top 24 toward the bottom 23. The elastic rubber 25 is provided so as to be stretchable so that the distance between the top 24 and the bottom 23 changes.

  A liquid chamber 22 is formed in the mount 21 so as to be surrounded by the top 24, the elastic rubber 25, and the bottom 23. The liquid chamber 22 is formed so that its volume increases and decreases as the elastic rubber 25 expands and contracts. The liquid chamber 22 is composed of one room without being divided into a plurality of rooms. That is, in the present embodiment, no partition is provided in the liquid chamber 22. The liquid chamber 22 is filled with, for example, an incompressible liquid such as silicon oil, water, or alkylene glycol.

  The mount 31 is formed in the same shape as the mount 21, and corresponds to the top 24, bottom 23, and elastic rubber 25 of the mount 21, and is fixed to the support member 10 n and the top 34 fixed to the suspension member 16. A bottom 33 and an elastic rubber 35 connecting the top 34 and the bottom 33.

  The mounting device in the present embodiment is further provided with a pipe 41 extending between the bottom 23 and the bottom 33. The piping 41 communicates between the liquid chamber 22 and the liquid chamber 32.

  FIG. 4 is a diagram schematically showing the state of pitching vibration generated in the rear differential in FIG. 2 to 4, when the vehicle travels, a reaction force is generated in the rear differential 10 with respect to the force input from the propeller shaft 12, so that pitching vibration is generated. This pitching vibration is a vibration in which the rear differential 10 swings like a seesaw around a position 200 between the support portion 10m and the support portion 10n. Pitching vibration becomes particularly large when the vehicle is started or accelerated / decelerated, and is a major cause of increasing vehicle vibration and noise.

  When pitching vibration occurs, at a certain moment, the support portion 10m tends to move vertically downward, and the support portion 10n tends to move vertically upward. That is, the support portions 10m and 10n tend to be slightly displaced in directions opposite to each other in the vertical direction. At this time, the elastic rubbers 25 and 35 are contracted, and the volumes of the liquid chambers 22 and 32 are reduced. Thereby, the liquid in the liquid chambers 22 and 32 is compressed, and a force in a direction opposite to the displacement direction of the support portions 10m and 10n acts on the support portions 10m and 10n.

  On the other hand, the position 200, which is the vibration center of pitching vibration, changes every moment depending on the traveling state of the vehicle such as speed, traveling direction, road surface condition, and the like. For this reason, the displacement amounts of the support portions 10m and 10n caused by the pitching vibration always change corresponding to the position 200. That is, if the position 200 is closer to the front of the vehicle, the displacement amount of the support portion 10m becomes smaller and the displacement amount of the support portion 10n becomes larger. Further, if the position 200 is closer to the rear of the vehicle, the displacement amount of the support portion 10m increases and the displacement amount of the support portion 10n decreases. Thus, if a difference arises in the displacement amount of the support parts 10m and 10n, a difference will also arise in the volume of the liquid chambers 22 and 32 when the support parts 10m and 10n are displaced. As a result, the compression rate of the liquid increases on the side where the displacement amount is large, so the force acting on the support portion increases, and the compression rate of the liquid decreases on the side where the displacement amount is small, so the force acting on the support portion is small. It will decrease.

  On the other hand, in the present embodiment, a pipe 41 that communicates between the liquid chamber 22 and the liquid chamber 32 is provided. For example, as shown in FIG. 4, assuming the moment when the position 200 approaches the rear of the vehicle, the fluid in the liquid chamber 22 flows into the liquid chamber 32 through the pipe 41. Thereby, the force received from the mount 31 can be increased by the support portion 10n having a small displacement amount, and the force received from the mount 21 can be decreased by the support portion 10m having a large displacement amount. Therefore, according to the present embodiment, it is possible to continue applying force to the support portions 10m and 10n with an appropriate balance.

  The powertrain mounting device according to the embodiment of the present invention includes a support portion 10m as a first support portion and a support portion 10n as a second support portion located away from the support portion 10m. Centering on a position 200 between the portions 10m and 10n, the rear differential 10 as a power train that generates vibrations in which the support portions 10m and 10n are displaced in opposite directions, and elasticity as an elastic member that is deformed by the vibration of the rear differential 10 It has rubber | gum 25 and 35, and is provided with the vehicle main body and the mounts 21 and 31 as a 1st and 2nd mount respectively arrange | positioned between the support parts 10m and 10n. The mounts 21 and 31 are formed with liquid chambers 22 and 32 as first and second liquid chambers, respectively, whose volumes change with deformation of the elastic rubbers 25 and 35 and in which the liquid is sealed. The powertrain mounting device further includes a pipe 41 for communicating between the liquid chamber 22 and the liquid chamber 32.

  According to the power train mounting device according to the embodiment of the present invention configured as described above, it is possible to effectively suppress the pitching vibration generated in the rear differential 10 without using a solenoid-type actuator or the like. . Thereby, the noise and vibration of a vehicle can be reduced and the comfort at the time of boarding can be improved.

  In addition, with respect to the bounce vibration in which the rear differential 10 moves up and down in parallel, it is possible to suitably suppress the bounce vibration by adding an orifice to the pipe 41. Further, in the present embodiment, one mount is provided in the front-rear direction of the vehicle, but for example, three-point support in which two mounts are disposed on the front side of the vehicle and one mount is disposed on the rear side of the vehicle. The present invention may be applied to a structure and a four-point support structure in which two mounts are arranged on the front side and the rear side of the vehicle. The power train to which the present invention is applied is not limited to a differential, and may be, for example, a propeller shaft, a transfer, or a transmission.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a perspective view which shows the differential mounting apparatus in embodiment of this invention. It is a side view of the mounting apparatus along the II-II line | wire in FIG. It is sectional drawing which expands and shows the mount in FIG. It is the figure which represented typically the mode of the pitching vibration which generate | occur | produces in the rear differential in FIG.

Explanation of symbols

  10 rear differential, 10m, 10n support, 21, 31 mount, 22, 32 liquid chamber, 25, 35 elastic rubber, 41 piping, 200 position.

Claims (2)

A first support portion; and a second support portion positioned away from the first support portion, wherein the first and second portions are centered on a position between the first support portion and the second support portion. A power train that generates vibrations in which the two support portions are displaced in opposite directions;
An elastic member that is deformed by vibration of the power train, and includes a vehicle body and first and second mounts disposed between the first and second support portions, respectively.
The first and second mounts have first and second liquid chambers in which the volume is changed in accordance with the deformation of the elastic member and liquid is sealed, respectively,
A powertrain mounting device comprising a pipe for communicating between the first liquid chamber and the second liquid chamber. The power train further includes a plurality of support portions,
The power according to claim 1, wherein a mount in which a liquid chamber is formed is disposed between the vehicle main body and each of the plurality of support portions, and the liquid chamber communicates with the pipe. Train mounting device.

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