JP4301901B2 - Anti-vibration mounting device - Google Patents

Description

  The present invention relates to an anti-vibration mount device for mounting a power plant on an automobile.

  Conventionally, as disclosed in Patent Document 1, for example, both ends of the longitudinal direction (the direction in which the crankshaft extends) of the power plant in which the engine and the transmission are arranged in series are positioned on the left and right ends of the engine room, respectively. Some vehicle body side frames are elastically supported by two mount members (anti-vibration mount devices). Since such a mount member is responsible for most of the weight of the power plant, it requires a certain degree of static rigidity at least in the vertical direction, which is disadvantageous in terms of absorbing and blocking engine vibration.

  In other words, the vibration generated mainly around the roll inertia main axis (hereinafter simply referred to as the roll axis) due to torque fluctuations during idling of the engine is not so large, but it is a low frequency range where humans feel uncomfortable. Therefore, it is desirable to prevent absorption by the mount member and transmission to the vehicle body.

  Therefore, in general, an inertia main shaft mount is employed in which the left and right mounting members are arranged as close as possible to the roll shaft of the power plant. In this way, even if the mount member is somewhat hard in the vertical direction (having high static rigidity), the dynamic spring around the roll axis becomes soft, thereby suppressing transmission of idle vibration to the vehicle body. It is done.

  However, if the dynamic spring around the roll axis is softened in this way, for example, when the engine output (torque) fluctuates greatly, such as during rapid acceleration, the entire power plant rolls greatly due to the reaction force (torque). There is a risk that the shaft rotates (rolls) around the shaft, thereby causing a problem of interference with surrounding components, or excessive deformation of the rubber portion of the mount member, resulting in a loss of durability. Therefore, in a general inertial spindle mount, in addition to the main mount members arranged on the left and right sides of the power plant, as disclosed in, for example, Patent Document 2, another mount member (one in the front and the back) Front mount and rear mount) are provided to control rolling of the power plant.

  For example, as disclosed in Patent Document 3, the support point of the power plant by the left and right mounting members is set to be slightly higher, and the entire power plant is swingably supported like a pendulum. A structure is also known in which a torque rod for restricting the shaking is provided independently so as to connect the lower end of the power plant and the vehicle body side (hereinafter referred to as a three-point pendulum mount). In this three-point pendulum mount, the support point of the power plant load is farther from the roll shaft than the general inertial spindle mount described above. When force (torque) is applied, the rotation around the roll axis of the power plant is also restricted by the left and right mounting members themselves, so it is considered that even a single torque rod can easily suppress the shaking of the power plant. .

  However, for example, in the case of a vehicle equipped with a large displacement engine or a hybrid vehicle, the output of the power plant becomes very large. Therefore, the rolling of the power plant due to the reaction force (torque) can be performed with a single torque as described above. It is difficult to hold down only with the rod.

  In addition, the fact that rolling due to such a large driving reaction force is also restricted by the left and right mounting members themselves means that a large horizontal load is input to these mounting members. For this reason, there is a concern that the durability of the rubber part or the like in the mount member is lowered.

In this regard, in the three-point pendulum mount described in the third conventional example, in addition to the independent torque rod provided at the lower end of the power plant, the left and right mounting members are respectively either before or after the mount main body. A torque rod is provided so as to extend in one direction, so that the rolling of the power plant due to the driving reaction force can be more reliably regulated, and the durability of the mounting member is suppressed by preventing deformation of the rubber part, etc. can do.
French Patent Application Publication No. 2736008 Specification Japanese Utility Model Publication No. 7-196944 German Patent Application No. 4209613

  By the way, although the torque rod is integrally provided also in the mount member currently disclosed by the said patent document 1, this torque rod has an inner cylinder body, an outer cylinder body, and these both cylinder bodies in the both ends, respectively. A cylindrical bush comprising a rubber elastic body for connecting the two is integrally provided, and one of the cylindrical bushes is attached to the vehicle body side, and the other is attached to the power plant side member in the mount main body. At this time, the cylindrical bush is fixed in a fastened state with bolts and nuts on both the vehicle body side and the power plant side member. Therefore, when assembling the mount member, it is necessary to fasten one cylindrical bush to the vehicle body side, and fasten the other cylindrical bush to the power plant side member, which increases the number of assembling steps. The sex will be reduced.

  The present invention has been made in view of such a point, and an object of the present invention is to improve the assemblability of the vibration-proof mount device integrally provided with the torque rod.

  The vibration-proof mount device of the present invention is a device that elastically supports at least one of both ends of the power plant mounted on the vehicle with respect to the vehicle body so that the longitudinal direction is the vehicle width direction.

  The anti-vibration mount device is provided between a vehicle body side member attached and fixed to the vehicle body side, a power plant side member attached and fixed to the power plant side, and the vehicle body side member and the power plant side member. And an elastic support for elastically supporting the power plant side member to the vehicle body side member and extending in the vehicle body front-rear direction between the power plant side member and the vehicle body side, and swinging in the roll direction of the power plant. A torque rod that regulates the movement, a pair of elastic bushings that are attached to both ends of the torque rod, and that elastically supports one end of the torque rod on the power plant side member and the other end on the vehicle body side, A non-fastening fixing means for fixing at least one of the pair of elastic bushes in a non-fastened state to the power plant side member or the vehicle body side;

  According to this configuration, the elastic bushes are attached to both ends of the torque rod, respectively. Among them, the elastic bush attached to one end is the power plant side member, and the elastic bush attached to the other end is the vehicle body. Fixed to the side. In addition, the vehicle body side here includes both the vehicle body side member in the mount main body portion and the vehicle body to which the vehicle body side member is attached and fixed.

  At that time, at least one of the pair of elastic bushes is fixed in an unfastened state by the non-fastening fixing means to the power plant side member or the vehicle body side. Thereby, the number of assembling steps is reduced as compared with the case where each of the pair of elastic bushings is fixed to the power plant side member and the vehicle body side by fastening, and the assembling property of the vibration-proof mount device is improved.

  The elastic bush includes an outer cylinder portion attached to an end of the torque rod so that a cylinder axis thereof is in the vertical direction, and the outer cylinder portion extends radially inward from an inner peripheral surface of the outer cylinder portion. And a rubber bush formed with a coaxial through hole. In this case, the non-fastening and fixing means may be a spindle that is press-fitted into the through hole and fixes the elastic bushing in a non-fastened state.

  By doing so, an elastic bush (so-called cylindrical bush) having an outer cylinder part and a rubber bush is arranged at the end of the torque rod so that the cylinder axis is in the vertical direction. Then, a spindle is press-fitted into the through hole, whereby the elastic bush is fixed in an unfastened state.

  The torque rod is required to have a relatively hard spring characteristic in the horizontal direction in order to receive the horizontal load accompanying the rolling of the power plant and restrict the rolling. On the other hand, in order to avoid the vertical vibration of the power plant due to road surface irregularities being transmitted to the vehicle body via the torque rod, a relatively soft spring characteristic is required in the vertical direction. In view of this, the cylindrical bush is arranged so that the cylindrical shaft is in the vertical direction at the end of the torque rod disposed extending in the longitudinal direction of the vehicle body. Thus, when a horizontal load is input to the torque rod, it acts on the compression of the rubber bush, so that a relatively hard spring characteristic is obtained. On the other hand, when a vertical load is input to the torque rod, the rubber bush Since the bush acts substantially on shear, a relatively soft spring characteristic can be obtained. In addition, since the elastic bushing is only press-fitted into the through-hole penetrating in the vertical direction, when a vertical load is input to the torque rod, the torque rod does not swing much in the vertical direction. It is not regulated, thereby making the vertical spring characteristics even softer. As a result, by reliably restricting the rolling of the power plant, it is possible to ensure the durability of the vibration-proof mount device and the like, while effectively preventing the vertical vibration of the power plant from being transmitted to the vehicle body side.

  The anti-vibration mount device may further include a power plant mounting flange that is formed integrally with the power plant side member and extends in the horizontal direction. In this case, the spindle may be arranged to extend in the vertical direction on the upper surface of the flange.

  The anti-vibration mount device may further include fastening and fixing means for fixing any one of the pair of elastic bushes to the power plant side member or the vehicle body side in a fastening state.

  In this case, the other of the pair of elastic bushes is fixed in a non-fastened state to the power plant side member or the vehicle body side by the non-fastening fixing means. Therefore, the number of assembling steps is reduced and the vibration isolating mount device can be easily assembled as compared with the case where each of the pair of elastic bushings is fixed to the power plant side member and the vehicle body side by fastening.

  Further, by setting any one of the elastic bushes to the fastening state, it is possible to prevent a problem that the torque rod is detached from the vibration-proof mount device.

  As described above, according to the vibration-proof mount device of the present invention, at least one of the pair of elastic bushes attached to both ends of the torque rod is not attached to the power plant side member or the vehicle body side. By fixing in a non-fastened state by the fastening and fixing means, it is possible to facilitate the assembly of the anti-vibration mount device as compared with the case where each of the pair of elastic bushings is fastened to the power plant side member and the vehicle body side by fastening. The production cost can be reduced.

  In particular, an elastic bushing having an outer cylinder part and a rubber bushing is arranged so that the cylinder axis is in the vertical direction at the end of the torque rod, and a spindle is press-fitted into the through hole so that the elastic bushing is By fixing in the non-fastened state, it is possible to facilitate the assembly of the vibration-proof mount device while satisfying the characteristics required for the torque rod.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

-Overall configuration-
1 and 2 show a schematic configuration of an engine mount system using an anti-vibration mount device according to an embodiment of the present invention. In both figures, reference numeral P denotes an engine 1 and a transmission 2 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 of the intake / exhaust system and auxiliary equipment of the engine 1 and shows only the main body portion from an obliquely upper right side on the rear side of the vehicle body. The engine main body portion includes a cylinder block 10 and an upper portion thereof. The belt cover 12 is disposed at the end in 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 at the top of the cylinder, and an oil pan (not shown) is disposed at the bottom of the cylinder block 10. Then, 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 extends from the mounting member 3 side to the upper end portion of the mounting bracket 15 extending upward therefrom. The flange plate 31b is fastened with 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.

  In this embodiment, the transmission 2 is an automatic transmission in which a differential is integrated in addition to a torque converter and a transmission gear train (may be a manual transmission or a CVT), and the bell housing 20a of the transmission case 20 is an engine. 1 is connected to the cylinder block 10 at the crankshaft side end, and drives 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. Drive shafts 22 and 22 extend. 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 respectively 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 3).

  By the way, in the above-mentioned 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 43 and 56, respectively. The rolling can be more reliably regulated, 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 43 and 56, and the rubber portion in the mount main body 30. It is possible to secure the durability by suppressing the deformation.

-Mount member structure-
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. 3A is a top view of the engine side mount member 3, and FIG. 3B is a left side view thereof. FIG. 4 is a partial cross-sectional view showing the internal structure of the mount main body 30 by omitting a torque rod 43 and the like which will be described later and partially cutting away.

  As shown in FIG. 4 above, 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 connecting fitting 32 on the vehicle body side are connected by a rubber support 33. The casing 31 is made of, for example, an aluminum alloy, and casts a thick cylindrical casing body 31a disposed so as to extend in the vertical direction and a flange plate 31b extending in a direction substantially orthogonal to the axis Z from the upper outer periphery thereof. Etc. are formed integrally.

  The connection fitting 32 has a substantially conical shape with an upper concavity, and is disposed substantially coaxially so that its upper end is positioned substantially at the center of the lower end opening of the casing body 31a. A rubber bearing 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 upper raised portion 34 a of the vehicle body side mounting bracket 34 to be fixed is joined, and both are fastened by bolts 35.

  A mortar-shaped concave portion is formed on the lower inner peripheral side of the rubber bearing body 33, and the peripheral surface of the concave portion is attached to the tapered side surface portion of the connecting 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 support 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.

  And the outer peripheral part of the disk-shaped partition plate 36 is overlaid on the upper end part of the cylindrical part of the rubber bearing 33 from above, and further, a generally hat-shaped rubber so as to cover the entire partition plate 36 from above. A diaphragm 37 is disposed, whereby the upper end opening of the rubber support 33 is liquid-tightly closed, and a hollow portion is formed therein. In the diaphragm 37, an outer cylindrical portion having an outer diameter substantially the same as the inner diameter of the casing main body 31a and an inner cylindrical portion continuous to the lower end of the hat-shaped main body portion 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.

  As described above, a buffer solution such as ethylene glycol is sealed in the cavity formed inside the rubber support 33, and this absorbs and reduces the vibration of the power plant P input to the rubber support 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 increases or decreases with deformation of the rubber support 33, and the upper side of the liquid chamber F The volume is expanded or contracted 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 peripheral portion of the partition plate 36 so as to extend in the circumferential direction. One end of the orifice passage opens toward the pressure receiving chamber below the liquid chamber, and the other end of the orifice passage 39 opens toward the equilibrium chamber above the liquid chamber. Then, the buffer solution in the pressure receiving chamber and the equilibrium chamber circulates through the orifice passage 39, so that the low-frequency vibration acting on the pressure receiving chamber from the rubber support 33 is attenuated.

  In addition to the mount main body 30 having the above-described structure, as shown in FIGS. 3 and 4, an inverted U-shaped stopper member 40 is disposed so as to straddle the top of the mount main body 30. The stopper member 40 is formed by pressing a steel plate or the like, for example, and is spaced downward from the upper end of the mount main body 30 by a predetermined distance and extending substantially horizontally in the front-rear direction, and downward from both front and rear ends. It has a pair of front and rear leg portions 40b, 40c that are bent and extend almost directly below. The lower end portions of the pair of front and rear leg portions 40b and 40c are bent into flange portions 40d and 40e, respectively. The front and rear flange portions 40d and 40e are respectively mounted on the vehicle body side mounting bracket 34 on the front and rear sides of the mount main body portion 30. In a state of being superimposed on the flange portions 34b, 34b, the bolts are fastened on the side frame 6 by bolts (not shown).

  Corresponding to the stopper member 40, the mount main body 30 is provided with an upper rubber layer 41 on the upper outer periphery of the casing main body 31a, and both front and rear ends of the casing main body 31a in the rubber layer 41 are raised upward. The upper bulging portions 41a, 41a are formed, and the upper bulging portions 41a abut against the beam portions 40a of the stopper member 40 from below, thereby restricting the upward movement of the casing body 31a. It has come to be. Further, the rubber layer 41 has an intermediate portion in the vertical direction having a thickness greater than or equal to a predetermined thickness, and the rubber layer 41 abuts on the front and rear legs 40b and 40c of the stopper member 40, whereby the casing main body 31a has a longitudinal direction. The movement to is to be regulated.

  A lower rubber layer 42 is formed on the outer periphery of the lower end portion of the casing body 31a so as to be connected to the rubber bearing body 33, and the rubber layer 42 also has lower ends at both front and rear ends of the casing body 31a. Lower bulging portions 42a and 42a that bulge are formed, and these come into contact with the front and rear end portions of the upper raised portion 34a of the vehicle body side mounting bracket 34, whereby the downward movement of the casing body 31a is restricted. It is like that.

  As a feature of the present invention, a torque rod 43 for restricting rolling of the power plant P is integrally disposed on the mount member 3 as shown in FIG. That is, when viewed from above as shown in FIG. 5A, the torque rod 43 is located on the left side of the mount body 30, that is, at an intermediate position between the mount body 30 and the belt cover 12 of the engine 1. The flange plate 31b is spaced apart (see FIG. 2B) and is disposed so as to extend in the front-rear direction substantially parallel to the beam portion 40a of the stopper member 40. Since the torque rod 43 is provided so as to extend in the front-rear direction on the side of the mount main body 30 as described above, the torque rod 43 may be long enough to absorb the vertical vibration of the power plant P by its swinging. In addition, the mount member 3 does not jump out greatly before and after, and the problem of interference does not occur in the front-rear direction. Moreover, although there is a dead space that is long in the front and rear and narrow in the left and right between the mount body 30 of the engine side mount member 3 and the belt cover 12 (side wall) of the adjacent engine 1, the torque rod 43 is dead. It is arranged using space effectively.

  The torque rod 43 is provided with thick disc-like connecting portions 45 and 46 at both front and rear end portions of the rod member 44, and the front end connecting portion 45 is an outer portion integrally provided at the front end of the rod member 44. A cylindrical portion 45a, a cylindrical fitting body 45b fitted into the outer cylindrical portion 45a, and a rubber bush extending gradually from the inner peripheral surface of the fitting body 45b inward in the radial direction so as to become thinner. 45c. On the other hand, the rear end connecting portion 46 is formed by elastically connecting an outer cylindrical portion 45a integrally provided at the rear end of the rod member 44 and an inner cylindrical portion 45b positioned coaxially with an annular rubber bush 45c. is there.

  The rubber bush 45c of the front end connecting portion 45 is formed with a through hole 45d penetrating in the vertical direction so as to be coaxial with the outer cylinder portion 45a. A spindle (bar) 48 is disposed so as to extend upward from the flange plate 31b at a vehicle body front position (a position away from the mount body portion 30 toward the vehicle body front) than the front end portion of the mount body portion 30. The front end connecting portion 45 is fixed to the flange plate 31b in a non-fastened state by the spindle 48 being press-fitted into the through hole 45d.

  On the other hand, the rear end connecting portion 46 of the torque rod 43 has a rear leg portion of the stopper member 40 at a position rearward of the vehicle body relative to the rear end portion of the mount main body portion 30 (a position away from the mount main body portion 30 toward the rear of the vehicle body). It is fixed to a bracket 49 welded to 40c. That is, the bracket 49 is formed, for example, by pressing a steel plate or the like so as to have a substantially inverted L shape, and a leg portion 49a extending vertically is welded to a side surface of the rear leg portion 40c of the stopper member 40, while the leg portion A stud bolt 47 is fixed to the front end side of the mounting portion 49b extending laterally from the upper end of 49a by welding so as to extend upward from the upper surface thereof. The inner cylinder portion 46b of the rear end connecting portion 46 of the torque rod 43 is externally inserted into the stud bolt 47 from above, and the nut 48 is screwed from above to the stud bolt 47 protruding further upward from the inner cylinder portion 46b. By combining, the rear end connecting portion 46 of the torque rod 43 is fixed to the bracket 49 in a fastening state.

  In the engine-side mount member 3 of this embodiment, the torque rod 43 disposed in the dead space between the engine 1 and the side of the mount main body 30 is a connecting member between the mount main body 30 and the power plant P. The front end portion of the torque rod 43 is supported on the flange plate 31b by using the fact that the flange plate 31b passes close to the flange plate 31b. Therefore, the connecting structure between the torque rod 43 and the power plant P side is extremely simple. It will be something. Similarly, by utilizing the fact that the rear end connecting portion 46 of the torque rod 43 is positioned in the immediate vicinity of the rear leg portion 40c of the stopper member 40, the torque rod 43 and the vehicle body side are connected by connecting both of them. The connecting structure is extremely simple.

  In addition, one end (rear end connecting portion 46) of both ends of the torque rod 43 is fixed to the vehicle body side in a fastened state, while the other end (front end connecting portion 45) is not. It is fixed to the member on the power plant P side in the fastened state. That is, as shown in FIG. 5, the assembly of the front end connecting portion 45 is completed simply by press-fitting the spindle erected on the flange plate 31b into the through hole 45d of the front end connecting portion 45 (see P1 in FIG. 5). (Refer to P2 in the figure). For this reason, the number of assembling steps is reduced, and assembling of the mount member 3 composed of the mount main body 30 and the torque rod 43 is facilitated.

  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 frame. 7 is suspended through a rubber block 51 by a metal frame member 50 attached to the 7 side. That is, the frame member 50 is formed, for example, by 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). Further, flange portions 54 and 54 are provided on the side of the main body 52 so as to extend to the side and the lower side by welding another steel plate piece, and the flanges 54 and 54 are attached 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 around 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 by, for example, drawing, and is embedded in the 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, the connecting pipe 55, 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 having rubber bushes 58a and 59c interposed at both ends of a rod member 57, respectively. Among these, the connecting portion 59 at the front end is a cylindrical bush, and includes an outer cylindrical portion 59a, an inner cylindrical portion 59b, and a rubber bush 59c. The inner cylindrical portion 59b is extrapolated to the small diameter portion 55a of the connecting pipe 55. And are 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 a stud type in which the stay bent portion 53a is sandwiched and fixed between two ring-shaped rubber bushes 58a, 58a skewered at the tip end portion of the rod member 57. Bush.

  That is, a circular flange 58 b is integrally formed on the rear end side of the rod member 57 of the torque rod 56, and a round hole formed at a bent portion 53 a of the stay portion 53 at a tip portion than the flange 58 b. 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 rear end side of the rod member 57 extending rearward of the vehicle body from the bent portion 53a, and a small-diameter screw portion is disposed at the tip of the rod member 57. 57a is provided, and the rubber bush 58a is sandwiched between the washer 58c and the bent portion 53a by fastening the washer 58c to the tip of the rod member 57 by a nut 58d screwed into the screw portion 57a. Has been.

  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 is of a low frequency and the amplitude is very small, the vibration is absorbed by the rubber support 33 and the rubber block 51 and transmitted to the vehicle body is very small. Further, idle vibration is absorbed by the torque rods 43 and 56 of both the mount members 3 and 5 by the bending of the rubber bushes 45c, 46c, 58a and 59c. Will not be transmitted.

  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 reaction forces applied from the independent torque rod 8 at the lower end of the power plant P and the torque rods 43 and 56 of the left and right mounting members 3 and 5, respectively. 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, after receiving the load input in the substantially horizontal direction, the rubber bushes 45c and 46c respectively disposed at the front and rear ends of the torque rod 43 are bent to the maximum, and then the torque rod 43 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, excessive deformation of the rubber bearing body 33 and the rubber block 51 of the mount members 3 and 5 and the peeling of the rubber block 51 are prevented, and sufficient durability can be ensured.

  Here, the front end portion of the torque rod 43 is fixed to the flange plate 31b in a non-fastened state, but the front end connecting portion 45 formed in the cylindrical bush is arranged in a direction in which the cylindrical shaft is in the vertical direction. Has been. For this reason, when a load in the horizontal direction is input to the torque rod 43, the rubber bush 45c acts on compression, and a relatively hard spring characteristic is obtained. That is, substantially the same characteristics as when the front end connecting portion 45 is fixed to the flange plate 31b in the fastened state are obtained.

  Furthermore, 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 bearing body 33 in the mount member 3 on the engine side, and the transmission side In the mount member 5, the rubber block 51 elastically deforms up and down to absorb vibrations, and the torque rods 43 and 56 swing in the mount members 3 and 5, respectively, to absorb up and down vibrations. That is, since the torque rods 43 and 56 are set to have a sufficiently long length, the swing angle of the torque rods 43 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. Particularly, since the front end and rear end connecting portions 45 and 46 are formed in a cylindrical shape so that the cylinder shafts are in the vertical direction, when the load in the vertical direction is input, the rubber bushes 45c and 46c are substantially omitted. Since it acts on the shear, the spring characteristics are soft.

  Further, since the front end connecting portion 45 of the torque rod 43 is in the non-fastened state, when a load in the vertical direction is input to the torque rod 43, the swinging of the torque rod in the vertical direction is not much restricted. Disappear. As a result, the spring characteristics in the vertical direction can be further softened.

  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 43 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 43 is provided so as to extend in the front-rear direction on the side of the mount main body 30, so that the length of the torque rod 43 is increased. Even if it is made sufficiently long, it does not jump out greatly before and after the mount member 3, thereby preventing the occurrence of interference problems.

  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 portion on the engine 1 side is close to the vehicle body side frame 6, and there is very little space in the vicinity. However, in this embodiment, the dead space between the mount main body 30 of the engine side mount member 3 and the engine 1 adjacent to the side thereof can be effectively used, and the torque rod 43 can be disposed there. .

  Furthermore, in this embodiment, the stopper member 40 is disposed so as to straddle the upper portion of the mount main body portion 30 so that the displacement in the upper direction and the front-rear direction can be reliably regulated. Since the torque rod 43 disposed on the side of the mount main body 30 does not interfere with the stopper member 40, both can be optimally laid out.

  And by fixing the front end part (front end connection part 45) of the torque rod 43 in a non-fastened state, assembling property can be improved as described above, and the production cost can be reduced. Moreover, since a fastening member (for example, a nut) is omitted, the production cost can be further reduced by reducing the number of parts.

(Other embodiments)
The configuration of the present invention is not limited to the above embodiment, but includes various other configurations. That is, in the 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. 7, for example, the partition plate 36 and the diaphragm 37 are removed from the mount body 30 of the above embodiment, and the static load of the power plant P is supported only by the rubber support 33. Good. In this way, cost can be reduced.

  Further, in the above embodiment, only the front end connecting portion 45 of the torque rod 43 is fixed in an unfastened state (fixed to the flange plate 31b). For example, as shown in FIG. Instead of 48, the rear end connecting portion 46 of the torque rod 43 (in this case, the rear end connecting portion 46 is composed of an outer cylindrical portion 46a, a fitting body 46b, a rubber bush 46c, and a through hole 46d in the same manner as the front end connecting portion 45. ) May also be fixed to the vehicle body in an unfastened state. Even in this case, a relatively hard spring characteristic can be obtained for a horizontal load input and a relatively soft spring characteristic for a vertical load input. Further, in this case, the assembly of the torque rod 43 is completed only by press-fitting the spindle 48 into each of the front end and rear end connecting portions 45 and 46, so that the assembly performance can be further improved.

  Although not shown, the spindle 48 of the flange plate 31b is replaced with a stud bolt 47, and the stud bolt 47 of the bracket 49 is replaced with a spindle, thereby conversely to the mount member 3 shown in FIG. The front end portion may be fixed to the power plant side in the fastening state, and the rear end portion may be fixed to the vehicle body side in the non-fastening state.

  In the above embodiment, the torque rod 43 has one end portion (front end connecting portion 45) fixed to the flange plate 31 b, while the other end portion (rear end connecting portion 46) is a vehicle body side member of the mount member 3. Although fixed to a certain bracket 49, the other end 46 of the torque rod 43 may be fixed to a vehicle body side member (for example, the side frame 6) as shown in FIG. At this time, the other end 46 may be fixed in a fastened state by the stud bolt 47 and the nut 47 a as shown in FIG. 9 or may be fixed in a non-fastened state by the spindle 48.

  Moreover, in the said embodiment, although the structure of the vibration isolating mount apparatus based on this invention is applied only to the engine side mount member 3, it is not restricted to this, It can apply also to the mount member 5 by the side of a transmission. .

  Furthermore, although the power plant P of the said embodiment arrange | positions the engine 1 and the transmission 2 in series in the longitudinal direction, it is not restricted to this, For example, the power plant P is installed horizontally in an engine room. A transmission may be arranged in parallel behind the mounted engine 1 so that the input shaft or the like extends in the vehicle width direction.

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 an enlarged view which shows the structure of an engine side mount member, (a) is a top view, (b) is a left view. It is a fragmentary sectional view which shows the internal structure of a mount main-body part. It is explanatory drawing which shows the assembly | attachment procedure of a front end connection part. FIG. 4 is a view corresponding to FIG. 3 for a transmission-side mount member. It is a figure which shows the structure of the other anti-vibration mount apparatus which is not a liquid enclosure type. It is a figure which shows the structure of the vibration proof mount apparatus which fixed the both ends of the torque rod in the non-fastened state. It is a figure which shows the structure of the vibration proof mount apparatus which fixed the other end part of the torque rod to the vehicle body side.

Explanation of symbols

P Power plant 1 Engine 2 Transmission 3 Engine-side mount member (anti-vibration mount device)
30 Mount Body 31 Casing (Power Plant Side Member)
31a Casing body 31b Flange plate 32 Connecting bracket (vehicle body side member)
33 Rubber bearings (elastic bearings)
43 Torque rod 45 Front end connection (elastic bush)
45a Outer tube portion 45c Rubber bush 45d Through hole 46 Rear end connecting portion (elastic bush)
47 Stud bolt (fastening and fixing means)
47a Nut (fastening and fixing means)
48 Spindle 6, 7 Side frame

Claims (3)

An anti-vibration mount device that elastically supports at least one of both ends of a power plant mounted on a vehicle so that a longitudinal direction thereof is a vehicle width direction,
A vehicle body side member mounted and fixed to the vehicle body side;
A power plant side member mounted and fixed on the power plant side;
An elastic support provided between the vehicle body side member and the power plant side member and elastically supporting the power plant side member on the vehicle body side member;
A torque rod disposed between the power plant side member and the vehicle body side so as to extend in the longitudinal direction of the vehicle body and restricts swinging of the power plant in the roll direction;
A pair of elastic bushings attached to both ends of the torque rod, one end of the torque rod being elastically supported by the power plant side member and the other end of the torque rod with respect to the vehicle body;
Non-fastening fixing means for fixing at least one of the pair of elastic bushes in a non-fastened state to the power plant side member or the vehicle body side,
The elastic bush includes an outer cylinder portion attached to an end portion of the torque rod so that a cylinder axis thereof is in the vertical direction, and extends radially inward from an inner peripheral surface of the outer cylinder portion, and the outer cylinder A rubber bush having a through hole coaxial with the part, and
The anti-vibration mounting device according to claim 1, wherein the non-fastening fixing means is a spindle that is press-fitted into the through hole and fixes the elastic bushing in an unfastened state . An anti-vibration mount device that elastically supports at least one of both ends of a power plant mounted on a vehicle so that a longitudinal direction thereof is a vehicle width direction,
A vehicle body side member mounted and fixed to the vehicle body side;
A power plant side member mounted and fixed on the power plant side;
An elastic support provided between the vehicle body side member and the power plant side member and elastically supporting the power plant side member on the vehicle body side member;
A torque rod disposed between the power plant side member and the vehicle body side so as to extend in the longitudinal direction of the vehicle body and restricts swinging of the power plant in the roll direction;
A pair of elastic bushings attached to both ends of the torque rod, one end of the torque rod being elastically supported by the power plant side member and the other end of the torque rod with respect to the vehicle body;
A non-fastening fixing means for fixing any one of the pair of elastic bushes in a non-fastened state to the power plant side member or the vehicle body side;
Fastening fixing means for fixing the other of the pair of elastic bushes to the vehicle body side or power plant side member in a fastening state,
The elastic bush includes an outer cylinder portion attached to an end portion of the torque rod so that a cylinder axis thereof is in the vertical direction, and extends radially inward from an inner peripheral surface of the outer cylinder portion, and the outer cylinder And a rubber bush connected to a central hole coaxial with the portion,
The non-fastening fixing means is a spindle that is press-fitted into the central hole and fixes the elastic bushing in an unfastened state,
The anti-vibration mount device according to claim 1, wherein the fastening and fixing means includes a bolt inserted into the center hole and a nut screwed into the bolt . In the anti-vibration mount device according to claim 1 or 2,
A power plant mounting flange that is formed integrally with the power plant side member and extends in the horizontal direction is further provided.
The anti-vibration mount device according to claim 1, wherein the spindle is disposed on the upper surface of the flange so as to extend vertically.

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