JP2007313924A - Mount system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mount system with a high vibration-proof effect relative to idling vibration and oscillation of a power unit 1 making an inertia main shaft O as a center. <P>SOLUTION: In the mount system comprising a first mount 2 for sharing/supporting load of the power unit 1 including a lateral placement engine 11 and a transmission 12 near a right side end relative to a vehicle traveling direction; a second mount 3 for sharing/supporting it at a left side end relative to the vehicle traveling direction; and a torque rod 4 extending in the longitudinal direction of the vehicle and connecting a lower part of the power unit 1 to a vehicle body side, one of the first and second mounts 2, 3 is arranged on the inertia main shaft O of the power unit 1 and the other is arranged behind the inertia main shaft O. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mount system for supporting a power unit including a horizontally installed engine and a transmission in a vibration-proof manner in an engine room of an automobile.

  In an automobile engine room, a power unit composed of an engine, a transmission, and the like passes through a mount system composed of a plurality of engine mounts that elastically support the load and a torque rod that prevents transmission of vibration due to engine torque fluctuations. Connected to the vehicle body side, this mount system prevents vibrations from the engine from being transmitted to the vehicle body side.

  5 is a plan view showing a schematic configuration of a conventional pendulum mount system, FIG. 6 is a view in the direction of the arrow VI in FIG. 5, and the upper side in FIG. 5 and the right side in FIG. is there.

  5 and 6, reference numeral 101 is a power unit including a horizontally mounted engine 102 and transmission 103 in a front-wheel drive vehicle, 104 and 105 are mounts for supporting the power unit 101 on the main shaft, and particularly 104 is a RH (light hand). ) Mount 105 is called a TM (transmission) mount. Reference numeral 106 denotes a torque rod that connects a position just below the center of gravity of the power unit 101 and a body frame (not shown) located behind the center in a substantially horizontal direction (front-rear direction).

  Here, with the driving of the engine 102, the power unit 101 generates rolling vibration that tries to rotate around the inertia main axis O passing through the center of gravity G of the power unit 101, and this rolling vibration becomes significant in the idle vibration region. Further, in the case of the horizontally-placed engine 102 as shown in the figure, the crankshaft is mounted so as to face the direction orthogonal to the vehicle traveling direction, so that the inertia main shaft O is also transverse to the vehicle traveling direction. ing.

  As a method for supporting the power unit 101 having such a horizontally placed engine 102, there is conventionally known a four-point support (see, for example, Patent Document 1 below), which is intended to prevent vibration as much as possible. It is a support system. However, since there are four support points, there is a problem that there are so many vibration transmission paths.

  In contrast, the pendulum (pendulum) mounting system shown in FIGS. 5 and 6 has the RH mount 104 and the TM mount 105 that support the left and right sides of the power unit 101 arranged on the inertia main axis O, that is, the power unit 101 is arranged. While supporting at two left and right points, the lower or upper part of the power unit 101 is connected to the vehicle body side via a torque rod 106 extending in the front-rear direction of the vehicle, thereby allowing some vibration to the power unit 101 itself, The structure reduces vibration transmission to the vehicle body (see, for example, Patent Document 2 below).

  More specifically, in the mount system of the pendulum system, in the case of small-amplitude rolling vibration (idle vibration) during engine idling, the RH mount 104 and the TM mount 105 disposed on the inertia spindle O are around the inertia spindle O. However, there is little up / down direction input that increases the sensitivity of the vehicle body to vibration, and the torque rod 106 increases the input in the vehicle front / rear direction, which is less sensitive. The transmission of idle vibration can be effectively reduced. In addition, the large-amplitude vertical movement due to free resonance of the power unit 101, such as overcoming a road step during traveling, can be attenuated in a short time by using a liquid-filled mount for at least one of the RH mount 104 and the TM mount 105. Can do.

  Furthermore, when driving reaction force due to torque change such as when the accelerator is fully opened, kick-down when automatically switching to the low-speed gear by stepping on the accelerator while driving at a constant speed, or switching the AT range For the large rolling (swinging) of the power unit 101 centering around the inertia main axis O, the vibration reducing effect by the RH mount 104 and the TM mount 105 is small, and such swinging is reduced by the torque rod 106. It is like that.

JP 2001-213177 A JP-A-5-202985

  However, when the driving reaction force due to the above-described kickdown, AT range switching, or the like increases to some extent, there is a problem that it is difficult to suppress the swing of the power unit 101 around the inertia main shaft O only with the torque rod.

  The present invention has been made in view of the above points, and the technical problem is to provide a mount system having a high anti-vibration effect against idling vibration and swinging of a power unit centered on an inertia main shaft. It is to provide.

  As a means for effectively solving the above technical problem, the mounting system according to the first aspect of the present invention is configured to support the load of the power unit including the horizontally mounted engine and the transmission in the vicinity of the right end with respect to the vehicle traveling direction. In a mounting system comprising: a first mount that is mounted; a second mount that is shared and supported in the vicinity of the left end with respect to the vehicle traveling direction; and a torque rod that extends in the longitudinal direction of the vehicle and connects the lower portion of the power unit to the vehicle body side. One of the first and second mounts is disposed on the inertial main shaft of the power unit, and the other is disposed rearward or forward of the inertial main shaft of the power unit.

  According to a second aspect of the present invention, in the mount system according to the first aspect, the mount disposed rearward or forward from the inertia main shaft is a liquid-filled mount, and the liquid-filled mount is an idle It has a sub-diaphragm that absorbs a change in hydraulic fluid pressure due to resonance in the frequency range of vibration, and an orifice through which hydraulic fluid flows due to liquid column resonance in a lower frequency range.

  According to the mount system of the present invention, the rolling of the power unit centered on the inertial spindle is an input in the vertical direction with respect to the mount disposed rearward or forward of the inertial spindle among the first and second mounts. Therefore, the oscillation of the power unit due to idle vibration and driving reaction force can be effectively suppressed.

  In addition, as described above, the rolling of the power unit centered on the inertia main axis is an input in the vertical direction with respect to the mount disposed rearward or forward of the inertia main axis among the first and second mounts. In the present invention, by using a liquid-filled mount as the mount, the vibration insulation is improved by lowering the spring constant due to the resonance of the sub-diaphragm in the idle vibration region, and the inertia main axis of the power unit is centered in the lower frequency region. It is possible to enhance the damping effect against oscillation and free resonance.

  Hereinafter, a preferred embodiment of a mounting system according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a schematic configuration of a mounting system according to the present invention, FIG. 2 is an arrow view in the II direction in FIG. 1, and the upper side in FIG. 1 and the right side in FIG.

  1 and 2, reference numeral 1 denotes a power unit that is mounted in an engine room at the front of a vehicle in a front-wheel drive vehicle and includes a horizontally mounted engine 11, a transmission 12, and the like. The horizontal engine 11 has a crankshaft substantially orthogonal to the vehicle traveling direction, and the transmission 12 also has an output shaft substantially orthogonal to the vehicle traveling direction.

  The power unit 1 is supported by a right body frame (not shown) via an RH (light hand) mount 2 in the vicinity of the right end in the vehicle traveling direction, that is, in the vicinity of the end on the side of the horizontally mounted engine 11. Near the left end, in the illustrated example, the vicinity of the end on the transmission 12 side is supported by a left body frame (not shown) via a TM (transmission) mount 3. The lower part of the power unit 1 is connected to a cross member (not shown) at the lower part of the vehicle body via a torque rod 4 extending rearward of the vehicle. The RH mount 2 corresponds to the first mount described in claim 1, and the TM mount 3 corresponds to the second mount described in claim 1.

  Here, a reference symbol O in the figure indicates an inertial main shaft that passes through the center of gravity G of the power unit 1, and the inertial main shaft is applied to the power unit 1 including the horizontal engine 11 by the torque of the driving reaction force of the horizontal engine 11. Rolling (oscillation) that tries to rotate around O occurs. Of the RH mount 2 and the TM mount 3 that share and support the load of the power unit 1, one RH mount 2 is disposed rearward from the inertia spindle O, and the other TM mount 3 is disposed on the inertia spindle O. ing.

  Although the RH mount 2 may be disposed in front of the inertial spindle O, in the illustrated example, the inertial spindle O is unevenly distributed forward on the right side of the power unit 1, so that the installation space is behind the inertia spindle O. Is preferable.

  FIG. 3 is a cross-sectional view showing an example of the RH mount 2. That is, the RH mount 2 is composed of a liquid-filled mount. Basically, an outer case-shaped first mounting member 21 and an inner peripheral second mounting member 22 are made of rubber-like elastic. It connects with the conical elastic body 23 which consists of material, and is provided so that the annular partition 25 and its inner periphery may be closed between the diaphragm 24 which is located in the lower side and was sealed by the 1st attachment member 21. The disc-shaped sub-diaphragm 26 made of a rubber-like elastic material defines an upper liquid chamber 2A on the elastic body 23 side and a lower liquid chamber 2B on the diaphragm 24 side, and both the liquid chambers 2A and 2B are It has a structure in which they communicate with each other through an orifice 2 </ b> C formed in the partition wall 25. In addition, the mount internal space including the upper liquid chamber 2A, the lower liquid chamber 2B, and the orifice 2C is filled with hydraulic fluid such as silicone oil. The RH mount 2 is configured such that one of the first mounting member 21 and the second mounting member 22 is connected to the power unit 1 side shown in FIG. 1 and the other is connected to the vehicle body frame side. It is elastically supported.

  The sub-diaphragm 26 can be vibrated and displaced in the thickness direction by changing the hydraulic pressure in the upper liquid chamber 2A. The resonance frequency of the sub-diaphragm 26 is set in the frequency range of idle vibration, and the working fluid that flows in the orifice 2C. The liquid column resonance frequency is set in a lower frequency range than the idle vibration.

  The TM mount 3 can also be a liquid-filled mount similar to the RH mount 2.

  FIG. 4 is a cross-sectional view showing an example of the torque rod 4. That is, the torque rod 4 includes a rod body 41, annular cases 42 and 43 provided integrally at both ends in the longitudinal direction, and bushes 44 and 45 press-fitted into the cases 42 and 43, respectively. ing. The bushes 44 and 45 are obtained by vulcanizing and bonding bush bodies 44c and 45c made of a rubber-like elastic material between annular outer sleeves 44a and 45a and inner sleeves 44b and 45b on the inner periphery thereof. In the torque rod 4, one of the inner sleeves 44b and 45b is coupled to a bracket (not shown) provided below the inertia main shaft O of the power unit 1 via a bolt or the like, and the inner sleeves 44b and 45b The other of them is coupled to a bracket provided on a cross member at the lower part of the vehicle body via a bolt or the like.

  In the above configuration, the power unit 1 including the horizontally mounted engine 11 generates idle vibration that is engine vibration of the horizontally mounted engine 11, that is, rolling vibration having a small amplitude in the rotational direction centering on the inertia main axis O during engine idling. . The TM mount 3 supporting the power unit 1 in the vicinity of the end on the transmission 12 side is located on the inertia main shaft O, and is therefore effective for idling vibration in the rotation direction around the inertia main shaft O. While no strong drag is generated, the transmission of the vibration displacement in the vertical direction, which increases the sensitivity of the vehicle body to vibration, is small.

Further, as described above, the idle vibration is a movement that attempts to rotate around the inertia main axis O, so that the idling vibration is relative to the RH mount 2 that supports the end of the engine 11 placed horizontally at a position behind the inertia main axis O. Te, as indicated by the arrow V ₁ in FIG. 2, it acts primarily as a displacement in the vertical direction. The RH mount 2 formed of the liquid-filled mount as shown in FIG. 3 is between the first mounting member 21 and the second mounting member 22 with respect to the input of such a small amplitude vertical vibration V _1. Since the pressure change in the upper liquid chamber 2A due to repeated deformation of the elastic body 23 is absorbed by the resonance of the sub-diaphragm 26, the dynamic spring constant becomes low, and the vibration transmission to the vehicle body frame is effectively insulated. Can do.

Moreover, idle vibration as described above, with respect to the torque rod 4 extending in the longitudinal direction of the vehicle is connected between the power unit 1 and the vehicle body lower portion of the cross member at below the principal axis of inertia O, arrow V ₂ in FIG. 2 As shown in FIG. 4, since the input is substantially in the front-rear direction, the transmission of vibration in the vertical direction is increased, which increases the sensitivity of the vehicle body to vibration.

That is, the idle vibration has a small vertical input on the TM mount 3 and the idle vibration is an input of the vertical vibration V _{1 on} the RH mount 2, but a liquid-filled mount is used as the RH mount 2. vertically it is possible to secure the vibration isolation against vibration V _1, yet similar to mounting system of pendulum type, since the structure for supporting the power unit 1 only two right and left, it is assumed less transmission path vibration during idling Can be effectively reduced.

  Further, since the RH mount 2 is composed of a liquid-filled mount as shown in FIG. 3, the vertical movement of the low frequency and large amplitude due to the free resonance of the power unit 1 when climbing over the road surface step while traveling is the upper part due to deformation of the elastic body 23 As the volume of the liquid chamber 2A changes, the hydraulic fluid is attenuated by repeatedly flowing in the orifice 2C by liquid column resonance, and is converged in a short time. In this case, if the TM mount 3 is also composed of a liquid-filled mount, attenuation by the orifice can be obtained by both the RH mount 2 and the TM mount 3, so that the vibration damping effect is enhanced.

  In addition, the driving reaction force due to torque changes, such as kickdown when the input vibration is fully open, or when the AT is automatically switched to the low-speed gear by depressing the accelerator while driving at a constant speed, or switching of the AT range When the power unit 1 is about to swing largely around the inertia main axis O by receiving the torque, the swing is input to the torque rod 4 in the longitudinal direction. Demonstrates damping force by the main bodies 44c and 45c.

  Here, in order for the torque rod 4 to secure the required vibration insulation, the bush bodies 44c and 45c need to have a low spring to some extent, so that conventionally, the torque rod 4 alone is not rocked by the driving reaction force. It was difficult to obtain sufficient resistance to movement. However, according to the form shown in the figure, this swing is a displacement in the vertical direction with respect to the RH mount 2 located behind the inertial spindle O, and for such a large amplitude vertical displacement, FIG. In the RH mount 2 composed of the liquid-filled mount as shown in FIG. 3, the working fluid repeatedly flows in the orifice 2C due to the liquid column resonance to generate a damping force. Arise. Therefore, the cooperation with the torque rod 4 can effectively suppress the swing of the power unit 1 due to the driving reaction force.

  Note that the longer the distance L from the inertia main axis O to the axis of the second mounting member 22 of the RH mount 2 that is the point of action of the moment by rolling, the greater the drag force against the above-mentioned swinging, but the idle Since the reduction of vibration is disadvantageous, the distance L is preferably 10 to 100 mm in view of the balance between the effects of idle vibration reduction and oscillation reduction.

  In the above-described embodiment, the TM mount 3 is disposed on the inertial spindle O and the RH mount 2 is disposed rearward of the inertial spindle O. Conversely, the TM mount 3 is disposed at a position shifted from the inertia spindle O. The RH mount 2 may be disposed on the inertia main axis O.

It is a top view which shows schematic structure of the mount system which concerns on this invention. It is an arrow view of the II direction in FIG. It is sectional drawing which shows an example of the RH mount in FIG.1 and FIG.2. It is sectional drawing which shows an example of the torque rod in FIG.1 and FIG.2. It is a top view which shows schematic structure of the mount system of the pendulum system based on a prior art. FIG. 6 is an arrow view in the VI direction in FIG. 5.

Explanation of symbols

1 Power unit 11 Horizontal engine 12 Transmission 2 RH mount (first mount)
2A, 2B Liquid chamber 2C Orifice 26 Sub-diaphragm 3 TM mount (second mount)
4 Torque rod G Center of gravity O Inertia spindle

Claims (2)

  A first mount (2) for supporting the load of the power unit (1) including the transverse engine (11) and the transmission (12) in the vicinity of the right end with respect to the vehicle traveling direction, and a left end with respect to the vehicle traveling direction A mounting system comprising: a second mount (3) that is shared and supported in the vicinity of a portion; and a torque rod (4) that extends in the front-rear direction of the vehicle and connects the lower portion of the power unit (1) to the vehicle body side. One of the second mounts (2, 3) is disposed on the inertial main shaft (O) of the power unit (1), and the other is disposed rearward or forward of the inertial main shaft (O). Mount system to be used.   Of the first and second mounts (2, 3), the mount disposed behind or in front of the inertia main shaft (O) is a liquid-filled mount, and this liquid-filled mount is in the frequency range of idle vibration. 2. A sub-diaphragm (26) that absorbs a change in hydraulic fluid pressure due to resonance, and an orifice (2C) through which hydraulic fluid flows due to liquid column resonance in a lower frequency region. Mounting system.

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