JP2005090695A - Vibration isolating mount device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispose a torque rod having a rod length sufficient for absorbing the vertical vibration of a power plant in a vibration isolating device with saved space in the vibration isolating device supporting the power plant such as the engine of a vehicle. <P>SOLUTION: A mounting member 45 (mounting part) fixedly mounting the lower part of a mount body part 30 on a vehicle body side frame 6 is formed in a roughly U-shape as viewed in the longitudinal direction of the vehicle. The torque rod 41 is disposed in a space part V of closed section which is surrounded by the mounting member 45 and the vehicle body side frame 6 so as to be intersected with the axis Z of the mount body part 30. One end part 42 thereof is connected to the mounting member 45 and the other end part 43 is connected to the mount body part 30 through a bracket 46. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an anti-vibration mount device for mounting a power plant on an automobile, and particularly to the technical field of layout in the case where a torque rod for restricting the swing of the power plant in the roll direction is integrally provided. .

  2. Description of the Related Art Conventionally, both ends in the longitudinal direction (direction in which the crankshaft extends) of a power plant in which an engine and a transmission are arranged in series are 2 with respect to the vehicle body side frames provided on the left and right ends of the engine room of the vehicle. An engine mount system that is elastically supported by two vibration-proof mounting devices is known. In such an engine mount system, since the vibration-proof mount device supports most of the weight of the power plant, a certain degree of static rigidity is required at least in the vertical direction. Prone to disadvantage.

  That is, vibration generated mainly around the roll axis due to torque fluctuations during engine idle operation, etc., is not so large in amplitude, but is in the low frequency range that humans feel uncomfortable, so it is absorbed by the anti-vibration mount device. It is desirable to prevent transmission to the vehicle body. Therefore, in general, an inertia main shaft mount is employed in which the anti-vibration mount devices at the left and right ends are arranged as close as possible to the roll inertia main shaft of the power plant (hereinafter simply referred to as the roll shaft). In this way, even if the vibration-proof mount device is somewhat hard in the vertical direction, the dynamic spring around the roll axis becomes soft, and thereby transmission of idle vibration to the vehicle body can be suppressed.

  However, if the dynamic spring around the roll axis is softened in this way, for example, when the engine drive output (torque) fluctuates greatly, such as during sudden acceleration, the entire power plant rolls greatly due to the reaction force (torque). It may rotate around the axis (rolling), and this may cause a problem of interference with surrounding parts, or excessive deformation may occur in the rubber part of the vibration-proof mount device, thereby impairing durability. is there.

  Therefore, for example, as disclosed in Patent Document 1, the support point of the power plant by the anti-vibration mount device is set to be slightly higher, and the entire power plant is swingably supported like a pendulum. In addition, it has been proposed to provide a torque rod for restricting the swing and the swing (rotation) around the roll axis so as to connect the lower end portion of the power plant and the vehicle body side (hereinafter, referred to as “the torque rod”). 3 point pendulum mount).

  In the above three-point pendulum mount, the support point of the power plant is far from the roll inertia spindle compared to the general inertia spindle mount, so there is a slight disadvantage in reducing idle vibration, but during sudden acceleration, etc. When the driving reaction force (torque) is applied in this way, the rotation of the power plant around the roll axis is regulated by the anti-vibration mount device itself, and the mass of the power plant functions as an inertial body that suppresses the oscillation. Therefore, it is considered that the vibration can be effectively suppressed by the torque rod provided at the lower end of the power plant.

  On the other hand, in such a three-point pendulum mount, as described above, the rotation around the roll axis of the power plant is restricted by the anti-vibration mount device itself. When the force is considerably large, as shown in Patent Document 1, it is desirable to provide a torque rod on the vibration-proof mount device itself. In this way, even if the driving reaction force is considerably large, it is possible to effectively regulate the swing of the power plant in the roll direction in cooperation with an independent torque rod that connects the lower end of the power plant and the vehicle body side. (The torque rod of the vibration-proof mount device mainly regulates the rotation around the roll axis).

In the anti-vibration mount device of Patent Document 1, the power plant is supported in a suspended state via a flange member disposed so as to extend in a substantially horizontal direction from the upper part of the anti-vibration mount device. For example, Patent Documents 2 to 4 are known as such support methods.
German Patent Application No. 4209613 JP 2001-99230 A Japanese Patent Laid-Open No. 10-169713 JP-A-5-296285

  By the way, as described above, when the torque rod is provided in the vibration-proof mount device, the torque rod is disposed in a substantially horizontal direction so as to receive the vehicle longitudinal force input to the vibration-proof mount device, and both ends thereof. Are connected to the vehicle body side and the power plant side, respectively. In this case, it is necessary to lengthen the length of the torque rod to some extent so that the vertical spring characteristics of the vibration-proof mount device are not adversely affected by the torque rod.

  However, if the torque rod is provided so as to extend from the anti-vibration mount device to the front side or the rear side of the anti-vibration mount device as in the conventional example (Patent Document 1), the entire anti-vibration mount device is disposed in the front and rear of the vehicle. There is a problem that it becomes longer in the direction, and the space in the narrow engine room cannot be used effectively.

  In particular, in the structure as in Patent Document 1 that supports the power plant in a suspended state with respect to the anti-vibration mount device, it is necessary to connect the power plant to the side surface of the anti-vibration mount device via, for example, a bracket or the like. Therefore, it is difficult to secure a space for arranging the torque rod on the side of the vibration-proof mount device in consideration of the freedom of layout of the bracket and the like.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a torque rod integrally provided in the vibration-proof mount device in a vibration-proof mount device that supports a power plant such as a vehicle engine. The torque rod having a sufficient rod length that can absorb the vibration in the vertical direction of the power plant can be arranged in the vibration-proof mount device in a space-saving manner.

  In order to achieve the above object, in the vibration-proof mount device according to the present invention, a torque rod is disposed so as to extend in the vehicle front-rear direction below the mount body that supports the load of the power train.

  Specifically, in the first aspect of the invention, at least one of the left and right ends of the power plant mounted on the vehicle is elastically supported with respect to the vehicle body so that the longitudinal direction is the left-right direction of the vehicle, and the power plant It is premised on an anti-vibration mount device provided with a torque rod that restricts swinging in the roll direction. And the substantially columnar mount body that supports the load of the power plant is disposed with its axis line directed vertically, and the mounting portion provided at the lower part of the mount body is connected to the vehicle body side frame, An upper portion of the mount body is connected to the power plant via a bracket, and the torque rod is disposed below the mount body so as to extend in the vehicle front-rear direction, and one end thereof is It is connected to the vehicle body side frame side, and the other end is connected to the power plant side.

  According to this configuration, even when the length of the torque rod is sufficiently long so that the vibration of the power plant or the like is not directly transmitted to the vehicle body via the torque rod, the torque rod is mounted on the lower side of the mount body. By providing in the space, the torque rod does not protrude greatly in front and rear of the mount body, and the torque rod does not interfere with the bracket etc. on the side of the mount body, that is, the torque rod is attached to the vibration-proof mount device. It can be arranged in a space-saving manner.

  According to a second aspect of the present invention, in the first aspect of the present invention, the mounting portion is provided in the lower portion of the mount body so that a space portion is formed between the lower end surface and the vehicle body side frame, and the torque rod Are arranged in the space so as to include the axis of the mount body.

  That is, in this configuration, the attachment portion is attached to the vehicle body side frame so that the space portion is formed below the mount body, and the torque rod is disposed in the space portion. Further, even if vertical vibration is input to the mount body due to power plant vibration or the like, only the vertical force is mainly applied to the torque rod arranged so as to cross the vertical axis of the mount body. Therefore, at this time, only the vertical force accompanying the vertical displacement of the mount body acts on the connecting portion between the mount body and the torque rod, and the occurrence of twisting in the connecting portion is prevented. .

  When the torque rod does not intersect the axis of the mount body, that is, when the torque rod is displaced to the left or right with respect to the axis of the mount body, the force due to the vertical displacement of the mount body is Since this is transmitted in an oblique direction with respect to the connecting portion, the connecting portion is distorted, and there is a risk of premature deterioration of the rubber member or the like disposed in the connecting portion.

  According to a third aspect of the present invention, in the second aspect of the present invention, the elastic member is disposed between the torque rod and at least one of the lower end surface of the mount body and the upper surface of the vehicle body side frame facing each other in the vertical direction in the space. It is assumed that

  As a result, excessive vertical displacement of the mount body in the vertical direction can be restricted by using a torque rod disposed in a cavity provided between the lower end surface of the mount body and the vehicle body side frame. Specifically, when an excessive vertical vibration input from the power plant is transmitted to the torque rod through the mount body, and the torque rod is displaced in the vertical direction in the space portion, the vertical displacement is: Since it is regulated by an elastic member disposed between the torque rod and at least one of the lower end surface of the mount body and the upper surface of the vehicle body side frame, the vertical displacement of the mount body is also regulated thereby.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the torque rod includes two substantially parallel plate members each extending in the vehicle front-rear direction, and connecting members that respectively connect the front and rear end portions of the two plate members. The two plate members are arranged one by one on both the left and right sides of the axis so as to be substantially symmetrical with respect to the axis of the mount body.

  That is, in this configuration, even if it is difficult to dispose the torque rod below the mount body due to structural limitations such as the mounting part by devising the structure of the torque rod itself, the torque rod is mounted on the anti-vibration mounting device. Can be arranged in a space-saving manner so as not to protrude in the left-right direction. In addition, when vertical vibrations are input to the mount body, vertical force is applied equally to the two left and right leaf springs constituting the torque rod via the connecting members at the ends thereof. Therefore, the occurrence of twisting in the connecting member can be prevented.

  According to the first aspect of the present invention, since the torque rod is disposed below the mount body so as to extend in the vehicle front-rear direction, the torque rod having a sufficient length that does not hinder the vibration damping performance of the mount body is prevented. The vibration mount device can be disposed in a space-saving manner, thereby preventing interference with other components in the engine room.

  According to the second aspect of the present invention, the torque rod is disposed so as to intersect the axis of the mount main body, and the force acting on the torque rod is only in the vertical direction due to the vertical displacement of the mount main body. Further, it is possible to prevent the torque rod from being twisted at the connecting portion on the power plant side and the vehicle body side frame side, and to prevent the connecting portion from being damaged.

  According to the invention of claim 3, since the elastic member is provided between the torque rod and at least one of the lower end surface of the mount body and the upper surface of the vehicle body side frame, the vertical direction of the mount body is utilized using the torque rod. Can be controlled.

  According to the fourth aspect of the present invention, the torque rod is constituted by the two plate members and the connecting members respectively connecting the two end portions, and the axis of the mount body is sandwiched when the two plate members are viewed from above and below. By arranging them symmetrically, it is possible to arrange the torque rod in the vibration-proof mount device in a space-saving manner, and to prevent the connection member from being twisted.

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

(Embodiment 1)
1 and 2 show a schematic configuration of an engine mount system S that uses an anti-vibration mount device according to an embodiment of the present invention. In both figures, reference numeral P denotes that the engine 1 and the transmission 2 are coupled in series. It is a power plant. This power plant P is mounted horizontally in an engine room of a car (not shown) so that its longitudinal direction (the direction in which the crankshaft of the engine 1 extends) is the vehicle width direction (the left-right direction of the vehicle body) It is elastically supported at two points with respect to the vehicle body side frames 6 and 7 via mount members 3 and 5 respectively disposed at both ends in the longitudinal direction, that is, at each end on the engine 1 side and transmission 2 side. Yes. Further, the lower end portion of the power plant P is connected to a rear vehicle body side member 9 (subframe or the like) by a torque rod 8 independent of the mount members 3 and 5.

  FIG. 1 omits all the intake / exhaust system and auxiliary equipment of the engine 1 and only the main body is viewed from the upper right side of the rear of the vehicle body. The belt cover 12 is provided at the end of the longitudinal direction opposite to the transmission 2 (the right end of the vehicle body shown on the front side in FIG. 1). A head cover 13 is disposed on the top of the head 11, and an oil pan (not shown) is disposed on the bottom of the cylinder block 10. The lower end side of the engine side mounting bracket 15 is fastened to the right side wall of the cylinder head 11 through the belt cover 12, and the mounting member 3 is attached to the upper end portion of the mounting bracket 15 (bracket) extending upward therefrom. The flange plate 31b extending from the side is fastened in a state of being overlapped from above. This engine-side mount member 3 is the vibration-proof mount device of the present invention, and the detailed configuration thereof will be described later.

  The transmission 2 is an automatic transmission in which a differential is integrated in addition to a torque converter and a transmission gear train (a manual transmission or a CVT may be used), and the bell housing 20a of the transmission case 20 is a crankshaft of the engine 1. Drive shafts 22 that are connected to the cylinder block 10 at the side ends and that drive the front wheels of the automobile from the bulging portion 20b formed at the rear of the bell housing 20a toward the left and right sides, respectively. 22 extends. The transmission-side mount member 5 is disposed so that the tip end portion of the tapered transmission case 20 is suspended from the side frame 7 on the left side of the vehicle body by the mount bracket 23. A detailed configuration of the transmission-side mount member 5 will also be described later.

  In the power plant P formed by connecting the engine 1 and the transmission 2 in series as described above, since the engine 1 is taller than the transmission 2, the roll axis R (roll inertia main axis) extending in the longitudinal direction. Is inclined downward from the end portion on the engine 1 side toward the transmission 2 side, as indicated by a one-dot chain line in the figure. Further, in this embodiment, the two mount members 3 and 5 responsible for the weight of the power plant P are spaced upward from the roll axis R, whereby the power plant P is connected to the two mount members 3 and 3. 5 is swingable like a pendulum around a line segment L (swing support shaft: see FIG. 2) connecting the support points of the load 5.

  When a large driving reaction force (torque) is applied, for example, when the vehicle is suddenly accelerated or decelerated, the power plant P is generally arranged on the roll axis R as schematically shown by the white arrow in FIG. While rotating (rolling) around, the whole swings back and forth like a pendulum around the upper swinging axis L. Such rolling and overall swinging is the lower end of the power plant P. It is regulated by the torque rod 8 disposed in the. That is, the basic configuration of the engine mount system of this embodiment is the same as that of a conventionally known three-point pendulum mount (the one disclosed in Patent Document 1).

  By the way, in the three-point pendulum mount, since the supporting point of the load of the power plant is generally separated from the roll shaft as compared with the inertia spindle mounting, the power is applied when the driving reaction force acts as shown in FIG. As described above, the rolling of the plant P is also regulated by the left and right mounting members 3 and 5 itself, and this is advantageous for regulating the displacement of the power plant P. However, in the case where the output is very large, such as a large displacement engine, it is difficult to suppress a large driving reaction force with only the single torque rod 8, and such a large driving reaction force is left and right. The problem of durability caused by acting on the mounting members 3 and 5 must also be taken into consideration.

  Therefore, in this embodiment, in addition to the independent torque rod 8, the left and right mounting members 3 and 5 are integrally provided with torque rods 41 and 56, respectively. The rolling can be regulated more reliably, and even if a large horizontal load is input to the mount members 3 and 5 at that time, the load is received by the torque rods 41 and 56, and the mount body 30 (mount body) The deformation of the rubber part or the like is suppressed to ensure its durability.

  Next, as a feature of the present invention, the detailed structure of the engine side mount member 3 will be described with reference to FIGS. Here, FIG. 3 is a partial cross-sectional view showing the left side surface of the engine-side mount member 3 and showing the internal structure of the mount main body 30 with a part thereof cut away. FIG. 4 is a front view of the engine-side mount body viewed from the front of the vehicle.

  As shown in FIG. 3, in this embodiment, the mount member 3 on the engine side is a so-called liquid-filled type, and the mount main body 30 that receives the static load of the power plant P is connected to the power plant side. A metal casing 31 and a vehicle body side connection fitting 32 are connected by a rubber elastic body 33. The casing 31 is made of, for example, an aluminum alloy, and has a thick cylindrical casing main body 31a arranged so as to extend in the vertical direction, and a flange plate 31b extending in the vehicle left direction substantially perpendicular to the axis Z from the upper outer periphery thereof. Similarly, a rear flange plate 31c extending rearward of the vehicle is integrally formed by casting or the like.

  The connection fitting 32 has a substantially conical shape with an upper concavity, and is disposed substantially coaxially so that its upper end is located substantially at the center of the lower end opening of the casing body 31a. A rubber elastic body 33 is interposed between the side surface portion of the ball and the inner peripheral surface of the casing main body 31a opposite to the outer periphery thereof, while the lower end surface of the connection fitting 32 is provided on the upper surface of the vehicle body side frame 6. The upper surface of the fixing member 45 to be fixed is joined, and both are fastened by the bolt 35.

  A mortar-shaped concave portion is formed on the lower inner peripheral side of the rubber elastic body 33, and the peripheral surface of the concave portion is attached to the tapered side surface portion of the connection fitting 32. It is formed in a substantially truncated cone shape so that it extends radially outward from the entire circumference of the coupling metal 32 and extends obliquely upward, and the outer peripheral surface of the upper part thereof is the inner peripheral surface of the casing body 31a. It is glued. Thus, the upper part of the rubber elastic body 33 bonded and fixed to the inner periphery of the casing body 31a is a relatively thick cylindrical shape that opens upward, and its upper end is the upper end of the casing body 31a. It is positioned below the portion by a predetermined length.

  Then, the outer peripheral portion of the disc-shaped partition plate 36 is superimposed from above on the upper end portion of the cylindrical portion of the rubber elastic body 33, and the substantially hat-shaped rubber so as to cover the entire partition plate 36 from above. A diaphragm 37 is provided, whereby the upper end opening of the rubber elastic body 33 is liquid-tightly closed, and a cavity is formed inside. In the diaphragm 37, an outer cylinder portion having an outer diameter substantially the same as the inner diameter of the casing main body 31a and an inner cylinder portion which is continuous with a lower end thereof via a flange portion are integrally formed on the outer peripheral side of the hat-shaped main body portion. A substantially cylindrical reinforcing plate 38 is embedded from the outer cylinder part to the inner cylinder part, and the outer cylinder part reinforced thereby is formed on the inner periphery of the upper end side of the casing body 31a from above. It is press-fitted and fixed in the inner fitting state.

  The cavity formed inside the rubber elastic body 33 as described above is filled with a buffer solution such as ethylene glycol, and this absorbs and relaxes vibrations of the power plant P input to the rubber elastic body 33. This is the liquid chamber F. The inside of the liquid chamber F is divided into upper and lower parts by the partition plate 36, and the lower side thereof is a pressure receiving chamber whose volume is enlarged or reduced with deformation of the rubber elastic body 33, and the upper side of the liquid chamber F The volume is expanded or reduced by the deformation of the diaphragm 37 to become an equilibrium chamber that absorbs the volume variation in the pressure receiving chamber. That is, an annular orifice passage 39 surrounded by the casing body 31a and the flange portion and the inner cylinder portion of the diaphragm 37 is formed above the outer periphery of the partition plate 36 so as to extend in the circumferential direction. One end of the orifice passage 39 opens to the pressure receiving chamber below the liquid chamber F, while the other end of the orifice passage 39 opens to the equilibrium chamber above the liquid chamber F. Then, the buffer solutions in the pressure receiving chamber and the equilibrium chamber are circulated through the orifice passage 39, so that the low frequency vibration acting on the pressure receiving chamber from the rubber elastic body 33 is attenuated.

  In addition to the mount main body 30 that elastically supports the power plant P as described above and damps the vibration of the power plant P as described above, the engine-side mount member 3, as shown in FIGS. 3 and 4, A torque rod 41 for restricting the swing of the power plant P in the roll direction (especially rotation around the roll axis R) is provided.

  The torque rod 41 has a shaft portion 41a formed in a substantially rectangular shape when viewed in cross section, and an attachment member 45 (attachment portion) for attaching the mount body portion 30 to the vehicle body side frame 6 at the lower portion. The one end 42 (the vehicle front side) is connected to the mounting member 45, while the other end 43 (the vehicle rear side) is the bracket 46. It is connected to the side surface of the mount main body 30 via the.

  One end portion 42 of the torque rod 41 has an outer cylindrical portion 42a integrally provided at the front end of the shaft portion 41a of the torque rod 41, as shown in FIG. 5 (section taken along line II in FIG. 3). And the inner cylinder part 42b arranged coaxially in the outer cylinder part 42a are elastically connected by an annular rubber bush 42c. Similarly, the other end part 43 is also the rear end side of the shaft part 41a. The outer cylinder part 43a, the inner cylinder part 43b, and the rubber bush 43c are comprised. An elastic member 44 is disposed in a predetermined range on the upper and lower surfaces of the shaft portion 41a. As will be described in detail later, when the torque rod 41 is largely displaced in the vertical direction, the elastic member 44 It functions as a stopper that regulates displacement.

  The cross section of the shaft portion 41a of the torque rod 41 is not limited to a substantially rectangular shape, and may be any shape such as a circle, an oval, or an ellipse. In this case, the elastic member 44 may be disposed on the upper side and the lower side of the shaft portion 41a of the torque rod 41, respectively.

  As shown in FIG. 4, the mounting member 45 is formed in a substantially U shape when viewed in the vehicle front-rear direction, for example, by press forming of a steel plate or the like, and is joined to the lower surface of the connection fitting 32 of the mount body 30. It has an upper portion 45a and a pair of left and right side portions 45b, 45b that are bent downward from both left and right end portions of the upper portion 45a and extend substantially directly below. The lower end portions of the pair of left and right side portions 45 b and 45 b are bent outward to form flange portions 45 c and 45 c, and the left and right flange portions 45 c and 45 c are respectively formed on the left and right sides of the mount main body 30. Fastened on the vehicle body side frame 6 by a bolt (not shown). Thereby, a space V having a closed cross section surrounded by the mounting member 45 and the vehicle body side frame 6 is formed.

  Further, the side portions 45b and 45b of the mounting member 45 are provided with through holes 45d and 45d on the vehicle front side, respectively, and between the side portions 45b and 45b, one end portion 42 of the torque rod 41 is provided. With the inner cylinder part 42b sandwiched in the axial direction, a bolt 71 is inserted into the through holes 45d and 45d and the inner cylinder part 42b, and a nut 72 is screwed from the outside of the side part 45b. The torque rod 41 is connected to the side portions 45b and 45b of the mounting member.

  The bracket 46 has a substantially U-shaped cross section that opens toward the mount main body 30 when viewed in the vertical direction, and is disposed so as to extend in the vertical direction. A notch is provided in the vicinity of the center in the vertical direction so as to form a U shape. That is, the bracket 46 is configured such that both end portions 46 b and 46 a protrude from the upper and lower sides to the vehicle front side, and the lower end 46 a has the other end portion 43 of the torque rod 41 in the same manner as the mounting member 45. The inner cylinder portion 43 b is connected by a bolt 73, while the rear flange portion 31 c of the mount body portion 30 is connected by a bolt 75 to the upper portion 46 b of the bracket 46. In this way, by connecting both ends of the bracket 46 to the torque rod 41 and the mount main body 30, the other end 43 of the torque rod 41 is connected to the mount main body 30.

With the above configuration, in the engine side mount member 3 of this embodiment, the attachment member 45 for attaching the lower portion of the mount main body 30 to the vehicle body side frame 6 side is formed in a substantially U shape when viewed in the vehicle front-rear direction. Since the space portion V is provided and the torque rod 41 is provided in the space, the mount member 3 is provided even when a torque rod having a sufficient length so as to absorb the vertical vibration of the power plant P is provided. The torque rod 41 can be prevented from interfering with other components in the engine room in the front-rear direction and the left-right direction. 30. When the casing 31 of the mount body 30 is displaced in the vertical direction, the bracket 4 6, only the vertical force along the axis Z direction of the mount main body 30 is transmitted to the torque rod 41. That is, since only the force in the vertical direction acts on the one end portion 42 and the other end portion 43 of the torque rod 41, the rubber bushes 42c and 43c of the one end portion 42 and the other end portion 43 are not twisted. Absent. Accordingly, it is possible to prevent early deterioration due to the twisting of the rubber bushes 42c and 43c.

  Further, when an excessive vertical vibration is input to the mount main body 30, the vertical displacement is naturally transmitted to the torque rod 41. However, when the torque rod 41 is largely displaced in the vertical direction, the torque Since the elastic members 44 provided on the upper and lower surfaces of the shaft portion 41a of the rod 41 abut against the lower surface of the upper portion 45a of the mounting member 45 or the surface of the vehicle body side frame 6, the vertical displacement of the torque rod 41 is restricted. Thereby, the vertical displacement of the mount main body 30 connected to the torque rod 41 is also restricted. That is, the torque rod 41 also has a role as a stopper that restricts the vertical displacement of the mount body 30.

  The elastic member 44 is not limited to the upper and lower surfaces of the shaft portion 41 a of the torque rod 41, but the lower surface of the upper portion 45 a of the mounting member 45 and the surface of the vehicle body side frame 6 facing the space V formed by the mounting member 45. You may make it provide in at least one.

  Next, the structure of the transmission-side mount member 5 is shown, for example, in an enlarged manner in FIG. 6. This is because the upper end portion of the mount bracket 23 extending upward from the front end side of the transmission 2 is connected to the vehicle body side. It is suspended through a rubber block 51 by a metal frame member 50 attached to the frame 7 side. That is, the frame member 50 is formed by, for example, press-molding a steel plate or the like, and integrally forming a rectangular frame-shaped main body portion 52 and a stay portion 53 extending therefrom toward the rear side of the vehicle body (the left side in the figure). The main body 52 is provided with flanges 54 and 54 extending laterally and downwardly by welding another steel plate piece to the vehicle body side frame 7 by bolts (not shown). It is supposed to be concluded.

  Further, a standing wall portion 52b is integrally formed on the main body portion 52 of the frame member 50 by drawing or the like so as to extend upward from the periphery of the opening portion 52a so as to surround the four sides of the vertical axis Z. A metal connecting pipe 55 is supported by a rubber block 51 having both left and right ends bonded to 52b so that its axial center is vertically movable. That is, the connecting pipe 55 is integrally vulcanized and molded so that the lower portion thereof has a relatively small diameter, for example, by drawing, and is embedded in a substantially central portion of the rubber block 51 except for the small diameter portion 55a. Do it. Then, the stud bolt 24 of the mount bracket 23 is inserted into the small diameter portion 55a of the connecting pipe 55 from below, and the nut 25 is screwed into the stud bolt 24 from above, so that the mount bracket 23 and the connecting pipe 55 are Is concluded.

  Further, a torque rod 56 is also provided integrally with the transmission-side mount member 5. That is, the front end (rear end) of the stay portion 53 extending rearward from the main body portion 52 of the frame member 50 is bent downward at a substantially right angle, and the bent portion 53a is bent as described above. The connecting pipe 55 connected to the main body 52 is located just behind the small-diameter portion 55a of the connecting pipe 55, that is, at a position substantially horizontally behind the vehicle body. A torque rod 56 is disposed between the stay bent portion 53a and the small diameter portion 55a of the connecting pipe 55 so as to extend in the longitudinal direction of the vehicle body.

  This torque rod 56 is provided with connecting portions 58 and 59 with rubber bushes 58a and 59c interposed at both ends of a rod member 57, respectively. The connecting portion 59 at the front end is particularly the same as that on the engine side. Similarly, it consists of an outer cylinder part 59a, an inner cylinder part 59b, and a rubber bush 59c. The inner cylinder part 59b is extrapolated to the small diameter part 55a of the connecting pipe 55 and coupled in an externally fitted state. On the other hand, the connecting portion 58 on the rear end side of the torque rod 56 is different from the other end portions 42 and 43 and the connecting portion 59 in that the two ring-shaped rubber bushes 58a and 58a skewered at the tip end portion of the rod member 57 are provided. A stay bent portion 53a is sandwiched and fixed therebetween.

  That is, a circular flange 58b is integrally formed on the rear end side of the rod member 57 of the torque rod 56, and a round hole formed in the bent portion 53a of the stay 53 is formed at the tip of the flange 58b. The rubber bush 58a is sandwiched between the bent portion 53a and the flange portion 58b. Further, another rubber bush 58a and a washer 58c are disposed on the distal end side of the rod member 57 extending rearward of the vehicle body from the bent portion 53a, and a small diameter screw portion 57a is disposed at the distal end portion of the rod member 57. When the washer 58c is fastened to the tip of the rod member 57 by a nut 58d that is screwed into the screw portion 57a, the rubber bush 58a is sandwiched between the washer 58c and the bent portion 53a. ing.

  In the engine mount system of this embodiment in which the weight of the power plant P is supported by the two left and right mount members 3 and 5 having the above-described configuration, for example, when the automobile is stopped and the engine 1 is in an idle operation state, When low-frequency vibration caused by torque fluctuation occurs around the roll axis R, the casing 31 on the power plant P side in the mount body portion 30 of the engine-side mount member 3 is minutely moved back and forth with respect to the connecting fitting 32 on the vehicle body side. Similarly, in the transmission-side mount member 5, the connecting pipe 55 on the power plant P side slightly vibrates back and forth with respect to the frame member 50 on the vehicle body side. However, since the vibration has a low frequency and the amplitude is very small, it is absorbed by the rubber elastic body 33 and the rubber block 51 and transmitted to the vehicle body very little. Further, the idle vibration is also absorbed by the torque bushes 41 and 56 of both the mount members 3 and 5 by the bending of the rubber bushes 42c, 43c, 58a and 59c, so that the vibration is transmitted through the torque rods 41 and 56 to the vehicle body. Will not be transmitted to the side.

  In addition, when a large driving reaction force (torque) is applied, for example, when the vehicle starts or suddenly accelerates, the power plant P generally has a roll axis R as schematically shown by a white arrow in FIG. As a whole, it swings back and forth like a pendulum about the upper swinging support shaft L while rotating (rolling) around. At this time, the rotational displacement around the roll axis R is caused by the reaction force applied from the independent torque rod 8 at the lower end of the power plant P and the torque rods 41 and 56 of the left and right mounting members 3 and 5. This effectively suppresses the displacement of the power plant P caused by the driving reaction force from becoming excessively large.

  For example, in the mount member 3 on the engine side, the rubber bushes 42c and 43c respectively disposed at the front and rear end portions 42 and 43 of the torque rod 41 are bent to the maximum after receiving a load input in a substantially horizontal direction. The torque rod 41 receives the input load. Similarly, in the mount member 5 on the transmission side, the torque rod 56 receives a large horizontal load input due to the driving reaction force. Thus, the rubber elastic body 33 and the rubber block 51 of the mount members 3 and 5 are prevented from excessively deforming or peeling off, and sufficient durability can be ensured.

  Further, for example, when an automobile is traveling on an irregular road surface, and the vehicle body and the power plant P are relatively vibrated up and down, the rubber elastic body 33 in the mount member 3 on the engine side, In the mount member 5, the rubber block 51 is elastically deformed up and down to absorb vibrations, and the torque rods 41 and 56 are oscillated in both the mount members 3 and 5 to absorb vertical vibrations. That is, since the length of each of the torque rods 41 and 56 is set sufficiently long, the swing angle of the torque rods 41 and 56 with respect to the relative vertical displacement of the vehicle body and the power plant P becomes small, and the vertical direction This vibration is absorbed by the bending of the rubber bush.

  Therefore, according to the vibration-proof mount device (engine-side mount member 3) according to this embodiment, not only the independent torque rod 8 is provided at the lower end of the power plant P, but also the left and right mount members 3 and 5 are each provided with torque. By providing the rods 41 and 56, it is possible to firmly receive the driving reaction force acting on the power plant P and suppress the shaking of the power plant P, and the rubber portions of the mount members 3 and 5 are excessive. Deformation can be suppressed and durability can be ensured.

  Further, in the engine-side mount member 3 having relatively no margin in the surrounding space, the torque rod 41 is provided so as to extend in the front-rear direction below the mount main body 30, so that the length of the torque rod 41 is reduced. Even if it is sufficiently long, it does not jump out largely before and after the mount member 3, thereby preventing the occurrence of an interference problem.

  In particular, in the case of the power plant P in which the engine 1 and the transmission 2 are arranged in series as in this embodiment, the end on the engine 1 side is close to the vehicle body side frame 6 and the mount bracket 15 is disposed there. Therefore, the margin of the space in the vicinity is extremely small. Therefore, as in this embodiment, the space V is formed below the mount main body 30 of the engine-side mount member 3, and the torque rod 41 is disposed there, so that the side of the mount member 3 with a narrow space is formed. In addition, the torque rod 41 does not protrude, and interference with the mount bracket 15 can be prevented.

(Embodiment 2)
FIGS. 7 to 9 show an anti-vibration mount device (mount member 3) according to Embodiment 2 of the present invention, in which a mount body 30 having the same configuration as that of Embodiment 1 is mounted and fixed on the side frame 6. FIGS. The torque rod 82 is configured by placing the two plate members 82a and 82a on the left and right sides of the support base 80 and connecting both ends of each plate member. It is what I did. 7 shows (a) a top view and (b) a left side view of the mount member 3, and FIG. 8 shows the mount member 3 with the torque rod 82 omitted, as viewed from the left side. A partial cross-sectional view with a part thereof cut away is shown. FIG. 9 shows a state in which the engine-side mount bracket 15 is attached to the mount member 3 attached and fixed on the vehicle body side frame 6.

  The support base 80 is formed of a substantially trapezoidal frame disposed so as to surround the four sides of the mount main body 30 when viewed from the left-right direction of the vehicle, and extends upward and downward in the vertical direction of the mount main body 30. The lower beam portion 80b includes a beam portion 80a, a lower beam portion 80b, and a front leg portion 80c and a rear leg portion 80d that respectively connect the upper beam portion 80a and the lower beam portion 80b at both ends thereof. The mounting bracket 32 of the mount body 30 is fastened to the upper surface of the mounting body 81 by mounting bolts 81. In addition, the front leg portion 80c and the rear leg portion 80d of the support base 80 are mounted for fixing the support base 80 to the side frame 6 so as to extend from the lower end portion in the vehicle front-rear direction. Fixed portions 80e and 80e are provided, and a plurality of meat thefts 80f are formed in the upper beam portion 80a, the lower beam portion 80b, the front leg portion 80c, and the rear leg portion 80d of the support base 80, respectively.

  As shown in FIG. 8, a connecting portion 83 for attaching the other end portion of the torque rod 82 whose one end portion is connected to the mount main body portion 30 is provided on the front leg portion 80 c of the support base 80. Is provided. The connecting portion 83 includes a cylindrical member 83a disposed in a through hole 80g provided in the front leg portion 80c, and in this state, between the inner surface of the through hole 80g and the outer peripheral surface of the cylindrical member 83a. The rubber member 83b is provided. On the other hand, the rear leg portion 80d of the support base 80 is provided with a notch on the vehicle rear side at the approximate center in the vertical direction, and a part of the space for disposing the mount main body portion 30 is It spreads toward the rear of the vehicle.

  The casing 31 of the mount main body 30 is provided with a connecting portion 84 that protrudes from the casing 31 toward the vehicle rear side so as to correspond to the space formed so as to expand toward the vehicle rear side. The connecting portion 84 is for connecting one end portion of the torque rod 82 to the mount body portion 30, and an outer cylinder portion 84 a formed integrally with the casing body 31 a of the casing 31, and an inner portion of the outer cylinder portion 84 a. And an inner cylindrical portion 84b positioned substantially coaxially with each other by an elastic rubber bush 84c.

  Corresponding to the support base 80, an upper rubber layer 85 is provided on the upper outer periphery of the casing body 31a, and both front and rear end portions of the casing body 31a in the rubber layer 85 are raised upward to expand upward. Protruding portions 85a and 85a are formed, and the upward bulging portions 85a abut against the upper beam portion 80a of the support base 80 from below so that the upward movement of the casing body 31a is restricted. It has become.

  On the other hand, a lower rubber layer 86 is formed on the outer periphery on the vehicle front side at the lower end of the casing main body 31a so as to be connected to the rubber elastic body 33 of the mount main body 30, and the casing main body 31a in the rubber layer 86 is formed. A lower bulging portion 86a that bulges downward is also formed at the front end portion, and this abuts the lower beam portion 80b of the support base 80 from above, thereby restricting the downward movement of the casing body 31a. It is like that.

  In addition, the outer peripheral surface of the connecting portion 84 is provided with a rubber layer 87 so as to be connected to the upper rubber layer 85, and when the connecting portion 84 is largely displaced in the vertical direction or rearward, The support base 80 comes into contact with the upper beam portion 80a, the lower beam portion 80b, and the rear leg portion 80d.

  As shown in FIG. 7, the torque rod 82 has two end portions of two plate members 82a, 82a, one end of which is bent in a substantially L shape in the width direction. 84, bolts 86 and 88, and nuts 87 and 89, and the connected both ends are also connected to the support base 80 and the mount main body 30, respectively. Specifically, the plate members 82a and 82a are disposed so as to sandwich the support base 80 in the left-right direction of the vehicle, and the bent one ends of the plate members 82a and 82a are In a state where the cylindrical member 83a of the connecting portion 83 of the support base 80 is sandwiched, a bolt 86 is passed through the plate members 82a, 82a and the cylindrical member 83a, and a nut 87 is screwed into the bolt 86, thereby the plate member 82a. , 82a and the cylindrical member 83a of the support base 80 are coupled to each other.

  On the other hand, in the other end portions of the plate members 82a and 82a, the other end portions sandwich the inner cylinder portion 84b of the connecting portion 84 of the mount main body portion 30 in the same manner as the one end portion. The plate members 82a and 82a and the inner cylinder part 84b of the mount main body 30 are connected by passing a bolt 88 through the 82a and 82a and the inner cylinder part 84b and screwing a nut 89 into the bolt 88.

  Here, it is preferable that the two plate members 82 a and 82 a constituting a part of the torque rod 82 are arranged so as to be substantially symmetrical with respect to the axis Z of the mount main body 30. In this way, when vertical vibration or the like is input to the mount main body 30, the left and right plate members 82a, 82a are connected via the connecting portions 83, 84 that connect the end portions of the plate members 82a, 82a. As a result, a vertical force is applied almost evenly to the connecting portions 83 and 84, so that it is possible to prevent the connecting portions 83 and 84 from being twisted.

  With the above configuration, as shown in FIG. 9, the torque rod 82 having the same effect as that of the first embodiment can be disposed without projecting greatly in the front-rear direction and the left-right direction. Further, it is possible to prevent interference with the engine-side mount bracket 15 attached to the side of the mount member 3 via the flange portion 31b.

  That is, in the second embodiment, both ends of the two plate members 82a and 82a are provided even when it is difficult to dispose the torque rod below the mount main body portion as in the first embodiment due to the structure of the support base 80. The torque rod 82 is configured by connecting the two, and the two plate members 82a and 82a are respectively provided on the lower side of the support base 80 of the mount body 30 so as to protrude in the front-rear direction and the left-right direction. The same effect as that of the first embodiment in which the torque rod 82 can be disposed in a space-saving manner can be obtained.

(Other embodiments)
The configuration of the present invention is not limited to the above-described embodiments, but includes various other configurations. That is, in each said embodiment, although the engine side mount member 3 (vibration-proof mount apparatus) which concerns on this invention is made into the liquid enclosure type, it does not restrict to this. That is, for example, as shown in FIG. 10, the partition plate 36 and the diaphragm 37 are removed from the mount main body 30 of the first embodiment so that the static load of the power plant P is supported only by the rubber elastic body 33. Also good. In this way, cost can be reduced. Although FIG. 10 shows an example of the case of the first embodiment, it may be similarly applied to the structure of the mount main body 30 of the second embodiment.

  In the first embodiment, the mounting member 45 for mounting and fixing the mount main body 30 to the vehicle body side frame 6 is formed in a substantially U-shaped cross section when viewed in the vehicle front-rear direction. Any shape may be used as long as a space is formed inward such as in a shape.

  Furthermore, in each said embodiment, although the structure of the mount member 3 which concerns on this invention is applied only to the engine side, you may apply not only to this but to the mount member 5 by the side of a transmission.

  Furthermore, the power plant P according to each of the above embodiments is one in which the engine 1 and the transmission 2 are arranged in series in the longitudinal direction. However, the present invention is not limited to this, and the power plant P is placed horizontally in an engine room, for example. A transmission may be arranged in parallel behind the engine 1 mounted in the vehicle so that the input shaft and the like extend in the vehicle width direction.

  As described above, the anti-vibration mount device according to the present invention has a torque rod disposed below the mount main body, so that, for example, in a vehicle in which a large displacement engine is mounted horizontally, This is particularly useful in the case where the torque rod is disposed in a space-saving manner integrally with a member that elastically supports the end portion.

It is a perspective view which shows schematic structure of an engine mount system. It is explanatory drawing which shows typically a mode that a driving reaction force (torque) acts, seeing a power plant from the vehicle body left side. It is a left view of the engine side mounting member which concerns on Embodiment 1 of this invention. It is the front view which looked at the engine side mount member from the vehicle front. It is the II sectional view taken on the line of FIG. It is an enlarged view which shows the structure of a transmission side mounting member, (a) is a top view, (b) is a left view. FIG. 7 is a view corresponding to FIG. 6 for an engine-side mount member according to Embodiment 2 of the present invention. It is the fragmentary sectional view which looked at the engine side mount member from the left side. It is an enlarged view at the time of attaching an engine side mount member on a vehicle body side frame. It is a figure which shows the structure of the other mount main-body part which is not a liquid enclosure type about the engine side mount member which concerns on Embodiment 1. FIG.

Explanation of symbols

1 Engine 2 Transmission 3 Engine-side mount member (anti-vibration mount device)
5 Transmission-side mount members 6, 7 Car body side frame 8 Torque rod 15 Engine-side mount bracket (bracket)
30 Mount body (mount body)
41 torque rod 41a shaft 42 one end (one end of torque rod)
43 Other end (the other end of the torque rod)
44 Elastic member 45 Mounting member (mounting part)
80 Support base (mounting part)
82 Torque rod 82a Plate member 83 Connecting portion 84 Connecting portion S Engine mount system P Power plant V Space portion Z Axis line

Claims (4)

A torque rod that elastically supports at least one of the left and right ends of the power plant mounted on the vehicle with respect to the vehicle body so that the longitudinal direction is the left-right direction of the vehicle, and regulates the swing of the power plant in the roll direction. An anti-vibration mounting device comprising:
A substantially columnar mount body that supports the load of the power plant is disposed with its axis line directed vertically, and a mounting portion provided at a lower portion of the mount body is coupled to a vehicle body side frame, while the mount The upper part of the main body is connected to the power plant via a bracket,
The torque rod is disposed below the mount body so as to extend in the vehicle front-rear direction. One end of the torque rod is connected to the vehicle body side frame side, and the other end is connected to the power plant side. An anti-vibration mount device that is connected to In claim 1,
The mounting portion is provided at the bottom of the mount body so that a space is formed between the lower end surface and the vehicle body side frame,
The anti-vibration mount device, wherein the torque rod is disposed in the space so as to include an axis of the mount body. In claim 2,
An anti-vibration mount device, wherein an elastic member is disposed between the torque rod and at least one of a lower end surface of the mount body and an upper surface of the vehicle body side frame facing each other in the vertical direction in the space. In claim 1,
The torque rod is composed of two substantially parallel plate members each extending in the vehicle front-rear direction, and connecting members that respectively connect the front and rear end portions of the two plate members.
The anti-vibration mount device according to claim 1, wherein the two plate members are arranged one by one on both the left and right sides of the axis so as to be substantially symmetrical with respect to the axis of the mount body.

Images