JP3738943B2 - Vehicle engine mount structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine mount structure of a vehicle. In particular, even if a force exceeding a set load is applied from the front of the vehicle, the power unit is not likely to move horizontally to the dash panel side, and the passenger space is not required to reinforce the dash panel. The present invention relates to an engine mount structure for a vehicle that can ensure safety.
[0002]
[Prior art]
A power unit including an engine and a transmission is suspended on a vehicle via mount brackets disposed at a plurality of locations. At this time, a mount is interposed between the mount bracket and the power unit to prevent vibration from the power unit from being transmitted to the vehicle side.
[0003]
As an engine mount structure for the vehicle, there is one disclosed in Japanese Patent Laid-Open No. 7-81435. The vehicle body front structure disclosed in this publication includes a power unit disposed on a surface that is substantially the same height as the cabin floor surface of the vehicle body front, a power unit side link, a vehicle body side link, and a link that connects both the links. In the vehicle body front structure that is attached to the strength member at the front of the vehicle body via an engine mount made of a member, the lower end side of the power unit side link attached to the vehicle body front side of the power unit is positioned on the vehicle body rear side of the power unit. In addition, the lower end of the power unit side ring is extended below the suspension cross member provided at substantially the same height as the cabin floor surface, and the lower end of the ring on the vehicle body side attached to the lower surface of the suspension cross member is connected by a connecting member. Connect and drop the power unit that moves backward in the event of a collision. So as to prevent adverse effects on the space.
[0004]
Further, there is one disclosed in JP-A-8-244474. The engine mounting device disclosed in this publication is an engine mounting device including a mounting bracket having a different shape, which is made of a resin having high rigidity in shape and not having high rigidity in shape. Is made of cast iron to reduce weight while maintaining high rigidity.
[0005]
[Problems to be solved by the invention]
By the way, in the conventional vehicle, in order to ensure safety, it is necessary to implement the following three items.
(1) Expanding the crushable space by expanding the engine room.
(2) Improvement of vehicle body side strength.
(3) Optimization of the direction of engine movement during a collision.
[0006]
However, problems in the above-mentioned items (1) and (2) may include a decrease in occupant space, an increase in cost, and an increase in weight due to vehicle size limitations.
[0007]
Further, as a problem in the above item (3), as shown in FIGS. 10 and 11, there are subframes (also referred to as “engine mount members”) 162 and the like, and the engine 110 and the transmission 112 are included in the subframe 162. In the case of a vehicle that fixes the power unit 114 consisting of the following, it is common to optimize the direction of engine movement by crafting to deform the subframe 162. There is an inconvenience that the rigidity of the subframe cannot be increased and noise and vibration cannot be eliminated efficiently.
[0008]
Further, in a vehicle in which a power unit composed of an engine and a transmission is mounted horizontally and is suspended at three points, that is, a left and right position of the power unit and a rear position of the vehicle, a rear mount positioned on the rear side of the power unit has a rear mount. The dash panel is disposed in front of the dash panel, and the dash panel needs to be reinforced in order to suppress the deformation amount of the dash panel.
[0009]
[Means for Solving the Problems]
Accordingly, the present invention is to eliminate the above disadvantages, as well as mounted in the state transversely power unit composed of an engine and transmission, in a vehicle suspension at three points between the left and right positions and a vehicle rear position of the power unit, vehicle Is a four-wheel drive system, and has a configuration in which a rear mount is directly attached to a transfer directed toward the rear of the vehicle .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
By inventing as described above, by directly attaching the rear mount to the transfer, it is possible to increase the rigidity and eliminate the resonance system such as the rear mount bracket, thereby effectively eliminating noise and vibration.
[0011]
【Example】
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0012]
1 to 7 show an embodiment of the present invention. 1-3, 2 is a vehicle, 4 is an engine room, 6 is a dash panel, 8 is a floor.
[0013]
An engine room 4 defined by a dash panel 6 and a floor 8 is formed in the front portion of the vehicle 2.
[0014]
And in this engine room 4, the power unit 14 which consists of the engine 10 and the transmission 12 is mounted in the back position rather than the upper cross member 16, and the position between the side frames 18-1 and 18-2 of both sides.
[0015]
At this time, the power unit 14 is mounted horizontally in the engine room 4 of the vehicle 2 as shown in FIGS.
[0016]
The power unit 14 is suspended at three points, that is, a left-right position and a vehicle rear position, as shown in FIGS.
[0017]
That is, as shown in FIGS. 2 and 6, the right position of the power unit 14 is provided with a right mount bracket 22 that holds the right mount 20, and the right mount bracket 22 is attached to an engine side bracket (not shown). The mount 20 is attached to the upper cross member 16 via the vehicle body right side bracket 24.
[0018]
As shown in FIGS. 2 and 7, the left position of the power unit 14 is provided with a left mount bracket 28 that holds the left mount 26, and the left mount bracket 28 is attached to a transmission side bracket 30. Is mounted on the upper cross member 16 via the left-hand side bracket 32.
[0019]
Further, a rear mount bracket 34 for suspending the vehicle rear position of the power unit 14 is provided extending to the vehicle rear side, and the rear mount 36 of the rear mount bracket 34 is installed below the floor 8 of the vehicle 2. .
[0020]
Specifically, as shown in FIGS. 1 to 3, the rear mount bracket 34 is offset to the right side of the vehicle 2 when extending from the power unit 14 to the vehicle rear side, and the rear mount after the offset is A rear mount 36 is attached to the bracket 34.
[0021]
4 and 5, the rear mount 36 includes a mount portion 38 made of an elastic member, a mounting cylinder portion 40 positioned at the central portion of the mount portion 38, and a housing that holds the mount portion 38. The housing portion 42 is formed of a soft member, for example, a resin material.
[0022]
Next, the operation will be described.
[0023]
When a force exceeding a set load is applied to the rear mount 36 from the front of the vehicle, the housing portion 42 having a small ductile force due to the characteristics of the resin material is destroyed, and the weight of the power unit 14 also acts to move the power unit 14. The direction is obliquely downward of the vehicle, and the horizontal movement of the power unit 14 toward the dash panel 6 side is suppressed.
[0024]
Thus, even if a force exceeding the set load is applied from the front of the vehicle, the rear mount 36 installed below the floor 8 of the vehicle 2 does not cause the power unit 14 to move horizontally to the dash panel 6 side. Even if the panel 6 is not reinforced, the safety of the passenger space can be ensured, which is practically advantageous, and the support point is separated from the power unit 14 by using resin so that a difference in strength occurs in the housing portion 42 of the rear mount 36. As a result, the function as a torque stopper of the power unit 14 is improved and the movement of the power unit 14 can be efficiently suppressed.
[0025]
Further, since the housing portion 42 of the rear mount 36 is formed of a soft member, for example, a resin material, the static strength is substantially the same as that of the conventional one in which the housing portion is formed of an iron material, and the weight is light. Since the natural frequency can be improved, noise and vibration can be efficiently eliminated, the manufacturing process can be simplified, the cost can be reduced, and this is economically advantageous.
[0026]
FIG. 8 shows a second embodiment of the present invention. In the second embodiment, portions having the same functions as those of the first embodiment will be described with the same reference numerals.
[0027]
The feature of the second embodiment is that the vehicle is of a four-wheel drive system, and the rear mount 36 is directly attached to the transfer 52 directed to the rear of the vehicle.
[0028]
That is, as shown in FIG. 8, an attachment portion 54 is formed on the transfer 52, and the attachment cylinder portion 40 of the rear mount 36 is attached to the attachment portion 54 by the attachment bolt 56. Reference numeral 58 denotes a mounting bolt for mounting the rear mount 36 on the vehicle body side.
[0029]
In this case, it is possible to increase the rigidity by directly attaching the rear mount 36 formed of a soft member, for example, a resin material, to the transfer 52 which is a box-shaped casting part having a high rigidity. Therefore, noise and vibration can be eliminated efficiently.
[0030]
The present invention is not limited to the above-described embodiments, and various application modifications are possible.
[0031]
For example, in the first embodiment of the present invention, the rear mount 36 is disposed horizontally below the floor 8 of the vehicle 2, but as shown in FIG. 9, the rear mount 62 is directed to the rear and lower position of the vehicle. It can also be set as the structure (SG1) made to incline as much as possible.
[0032]
That is, as shown in FIG. 9, the rear mount 62 is installed below the floor 8 of the vehicle so as to be inclined at a predetermined angle A with respect to the horizontal plane S so as to be directed toward the rear and lower positions of the vehicle.
[0033]
At this time, the predetermined angle A for inclining the rear mount 62 substantially coincides with the direction in which the power unit (not shown) is to be moved when a force exceeding the set load is applied from the front of the vehicle.
[0034]
Then, when a force exceeding a set load is applied from the front of the vehicle, there is no possibility that the power unit moves horizontally to the dash panel side by the rear mount 62 installed to be inclined below the floor 8 of the vehicle. Even if the dash panel is not reinforced, the safety of the passenger space can be secured, which is practically advantageous.
[0035]
Further, as shown by a one-dot chain line in FIG. 9, if the housing portion 64 of the rear mount 62 is provided with a projecting portion 68 projecting in an arc shape on the mounting tube portion 66 side, a force exceeding the set load from the front of the vehicle is obtained. Even when the mounting tube portion 66 moves in the horizontal direction and moves to the protruding portion 68 side of the housing portion 64 when it acts, the protruding portion 68 causes the mounting tube portion to be moved as shown by a one-dot chain line arrow in FIG. 66 can be guided to be directed to the rear and lower position of the vehicle, which can contribute to prevention of horizontal movement of the power unit toward the dash panel.
[0036]
Furthermore, in the above-mentioned measures, when a force exceeding the set load is applied from the front of the vehicle, the power unit is only moved so as to be directed to the rear and lower positions of the vehicle. Can do.
[0037]
That is, the direction in which the power unit is moved can be the rear and lower position of the vehicle, and can be the left or right direction.
[0038]
Then, when a force exceeding the set load is applied from the front of the vehicle, the power unit moves in the lower position on the rear side of the vehicle and in either the left or right direction. The distance becomes large, the safety of the passenger space can be further improved, and the large moving distance functions as a buffer, which is practically advantageous.
[0039]
At this time, if a guide groove for moving the power unit in the lower position at the rear of the vehicle and in either the left or right direction is formed in the lower part of the vehicle floor, a force exceeding the set load is applied from the front of the vehicle. Therefore, the power unit can be reliably guided in a predetermined direction, that is, a lower position behind the vehicle and either the left or right direction by the guide groove, and the safety of the passenger space can be further improved.
[0040]
【The invention's effect】
As described above in detail, according to the present invention, in a vehicle in which a power unit composed of an engine and a transmission is mounted horizontally and suspended at three points of the left and right positions of the power unit and the vehicle rear position , Since the four-wheel drive system is adopted and the rear mount is directly attached to the transfer that is directed to the rear of the vehicle, the power unit is installed by the rear mount installed below the vehicle floor even if a force exceeding the set load is applied from the front of the vehicle. There is no fear that the vehicle will move horizontally to the dash panel side, and it is possible to secure the safety of the passenger space without reinforcing the dash panel, which is practically advantageous and causes a difference in strength in the housing part of the rear mount. The support point is separated from the power unit by using resin and extends to the rear side of the vehicle. Also improve the function as the torque stop of power unit by the one in which the motion of the power unit can be efficiently suppressed.
[Brief description of the drawings]
FIG. 1 is a front view of a suspended engine showing a first embodiment of the present invention.
FIG. 2 is a schematic plan view of an engine room in a state where an engine is mounted on a vehicle.
FIG. 3 is a plan view of the engine when suspended.
FIG. 4 is an enlarged front view of a rear mount.
FIG. 5 is an enlarged plan view of a rear mount.
FIG. 6 is a perspective view of a mount side bracket and a mount for suspending the right side of the engine.
FIG. 7 is a mounting perspective view of a mount side bracket that suspends the left side of the engine, a mount, and a transmission side bracket.
FIG. 8 is a perspective view of an attachment when a rear mount according to a second embodiment of the present invention is directly attached to a transfer of a four-wheel drive vehicle.
FIG. 9 is a schematic view of the mounting state of the rear mount showing another first embodiment of the present invention.
FIG. 10 is a front view of a suspended engine showing the prior art of the present invention.
FIG. 11 is a plan view of the engine when suspended.
[Explanation of symbols]
2 Vehicle 4 Engine room 6 Dash panel 8 Floor 10 Engine 12 Transmission 14 Power unit 20 Right side mount 22 Right side mounting bracket 24 Car body right side bracket 26 Left side mount 28 Left side mounting bracket 30 Transmission side bracket 32 Car body left side bracket 34 Rear mount bracket 36 Rear mount 38 Mount portion 40 Mounting cylinder portion 42 Housing portion

Claims (3)

In a vehicle in which a power unit composed of an engine and a transmission is mounted horizontally and is suspended at three points of the left and right positions of the power unit and the vehicle rear position, the vehicle is a four-wheel drive system, and the transfer is directed to the rear of the vehicle. An engine mount structure for a vehicle characterized in that a rear mount is directly attached . 2. The engine mount structure for a vehicle according to claim 1, wherein the rear mount is installed at a position below the floor of the vehicle so as to be oriented toward the rear and lower positions with respect to a horizontal plane. The said rear mount has a mount part, the attachment cylinder part located in the center site | part of this mount part, and the housing part which encloses the said mount part, The housing part was formed with the soft member. 3. The engine mount structure for a vehicle according to 2.

Images