JPS6340012Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a mounting device for a power unit that mounts a power unit in which a vehicle engine and a transmission are integrally combined on a vehicle body in a vibration-proof manner. The present invention relates to a mounting device for a so-called horizontal power unit in which a shaft and an input/output shaft of a transmission are arranged in the lateral direction of a vehicle body.

This type of power unit mounting device, known from the conventional Japanese Utility Model Application Publication No. 56-97124, includes an elastic body interposed between the power unit and the vehicle body, and a mounting device that prevents the deformation of the elastic body from exceeding a predetermined value. It is known to have a stopper body spaced apart from the elastic body by a stopper clearance so that the elastic body comes into contact with the stopper body to suppress the deformation of the elastic body and suppress the tilting of the power unit.

However, in such conventional mounting devices, the stopper clearance when the elastic body deforms in response to the torque reaction force of the forward drive force of the power unit is limited by the torque reaction force of the reverse drive force of the power unit. The structure is such that the stopper clearance is equal to the stopper clearance when the elastic body is deformed. Therefore, when the power unit rolls within the stopper clearance range,
In order to prevent the power unit from interfering with the parts in the engine room, it is necessary to leave a large gap between the power unit and the engine room, which makes it difficult to make the engine room more compact. It was hot. Furthermore, when the power unit rolls within the stopper clearance range, there is also the problem that the durability of the elastic body of the mounting device and the connecting portion of the exhaust pipe is shortened. To solve this problem, by increasing the spring constant of the elastic body,
It is possible to suppress the roll motion of the power unit by reducing the deformation of the elastic body or by reducing the stopper clearance in both directions. If the stopper clearance is made small, the vibrations of the power unit will be easily transmitted to the vehicle body, causing another problem in that it is unfavorable in terms of soundproofing and vibration-proofing performance in the vehicle interior.

This idea was created by focusing on these conventional problems, and includes an elastic body interposed between the power unit and the vehicle body, and when the deformation of the elastic body reaches a predetermined value or more, the elastic body deforms. a stopper body disposed apart from the elastic body by a stopper clearance so as to abut and suppress deformation of the elastic body, the elastic body being deformed by receiving the torque reaction force of the reverse driving force of the power unit The stopper clearance in the direction in which the elastic body deforms in response to the torque reaction force of the forward driving force of the power unit is made smaller than the stopper clearance in the direction in which the elastic body deforms in response to the torque reaction force of the forward driving force of the power unit. The object of the present invention is to solve the above-mentioned problem by making the permissible limit of the roll angle of the power unit smaller during reverse drive, which does not require interruption of the power supply, than during forward drive.

This invention will be explained below based on the drawings.

1 to 4 show an embodiment of this invention.

First, the configuration will be explained. FIG. 1 is a side view of the engine compartment 1 at the front of the vehicle body, with arrow A indicating the front of the vehicle and arrow B indicating the rear of the vehicle. In FIG. 1, 2 indicates a power unit. The power unit 2 is an integral combination of an engine and a transmission, and is arranged so that the engine crankshaft and the input and output shafts of the transmission extend in the lateral direction of the vehicle body. will be placed on. The power unit 2 houses a final reduction gear (not shown) in a protruding portion at the lower rear thereof, and this final reduction gear is connected to a drive axle (not shown) extending in the lateral direction of the vehicle body. C indicates the roll center of the power unit 2. Reference numeral 3 denotes an exhaust pipe, which is attached to the front of the upper part of the power unit and extends to the rear of the lower part of the vehicle body. 4 is an air cleaner, which is attached to the upper part of the power unit 2. 5 is a radiator provided in the front of the engine compartment 1 of the vehicle body, and 6 is a dash panel provided in the rear of the engine compartment 1 of the vehicle body.
7 is a hood panel, and 8 is a floor panel. Reference numerals 9 and 10 indicate mounting devices for the power unit of this embodiment. There are two mounting devices 9 (only one is shown in FIG. 1), which are used to attach the front left and right sides of the power unit 2 to the vehicle body (not shown), as shown in detail in FIG. A cylindrical outer cylinder 11, a cylindrical inner cylinder 12 disposed within the outer cylinder 11, and an insulator as an elastic body disposed between the outer cylinder 11 and the inner cylinder 12 to connect them. It has a rotor rubber 13. The insulator rubber 13 has protrusions 14 and 15 having equal protrusion lengths and protruding to both sides of the mounting device 9 in the axial direction. The mounting device 9 attaches the power unit 2 to the vehicle body, as shown in FIG. 3, which is an enlarged view of section A in FIG. 1 in detail. That is, the mounting device 9 is arranged so that its axial direction extends in the longitudinal direction of the vehicle body, the outer cylinder 11 is attached to the power unit 2 via a bracket (not shown), and the inner cylinder 12 is attached to two parallel plate-shaped brackets. A bolt 17 inserted into the inner cylinder 12 through a bolt 16 to the vehicle body (not shown);
It is attached by a nut 18 that fastens this bolt 17. In this embodiment, the protrusions 14 and 15 of the insulator rubber 13 are arranged so as to face the longitudinal direction of the vehicle body, and the bracket 1 on the vehicle body side
Reference numeral 6 denotes a stopper body 1 which holds the mounting device 9 from both sides and can be brought into contact with these protrusions 14 and 15.
9 and 20 are formed. In this case, the distance between the stopper bodies 19, 20 and the protrusions 14, 15 of the insulator rubber 13, that is, the stopper clearances Cl _FD , Cl _FR , is larger on the rear side of the vehicle body Cl _FD than on the front side of the vehicle body Cl _FR . On the other hand, as shown in FIG. 1, the mounting device 10 is for attaching the rear lower part of the power unit 2 to the lower part of the dash panel 6, and includes a member 22 fixed to a bracket 21 attached to the power unit 2, and a member 22 fixed to the bracket 21 attached to the power unit 2, A member 24 having a U-shaped cross section is fixed to a bracket 23 attached to the lower part of the member 6, and both members 2
2 and 24, and a rectangular parallelepiped-shaped insulator rubber 25 serving as an elastic body connecting the parts 2 and 24. Rubber is fixed to two bent surfaces of the member 24 having a U-shaped cross section and facing the insulator rubber 25 to form stopper bodies 26 and 27. The distance between the stopper bodies 26, 27 and the insulator rubber 25, that is, the stopper clearances Cl _RD and Cl _RR , is the distance between the stopper body 27 and the insulator rubber 25 on the upper side in FIG. The clearance Cl _RR is smaller than the stopper clearance Cl _RD between the stopper body 26 and the insulator rubber 25 on the lower side in FIG.

Next, the action will be explained.

The power unit 2 performs a roll motion as described below. The power unit 2 performs a roll motion of rotating in the direction of the arrow a about the roll center C in FIG. 1 by the torque reaction force generated by the forward driving force generated by itself. The larger the forward driving force is, the larger the torque reaction force that tends to cause this rolling movement is. Therefore, it is larger when the vehicle is accelerating than when traveling at a constant speed, and in the case of an automatic transmission, it also occurs when the vehicle is stopped in the D range. On the other hand, the power unit 2 performs a roll movement in the direction of arrow b about the roll center C in FIG. 1 by the torque reaction force generated by the backward driving force generated by itself. The torque reaction force that tends to cause this roll motion increases as the reverse driving force increases, and also occurs not only during reverse travel but also during engine braking. Furthermore, when the engine is idling, the power unit 2 generates irregular roll vibrations in the directions of arrows a and b due to engine torque fluctuations.

The roll motion of the power unit 2 explained above is approximately in the shearing direction of the insulator rubbers 13 and 25 of the mounting devices 9 and 10, approximately in the axial direction in the mounting device 9, and approximately at a point upward in the rearward direction in the mounting device 10. It acts as a force acting in the direction of the chain line e. Therefore, when the roll angle of the power unit 2 is relatively small, such as when idling or when the vehicle is running at a constant speed,
The mounting devices 9 and 10 absorb vibrations generated by the power unit 2 (mainly high-order vibration components of the engine and gear noise) by shearing deformation of the insulator rubbers 13 and 25 with a relatively small spring constant. It is possible to cut off the transmission to the vehicle body. When the forward driving force of the power unit 2 increases as during sudden acceleration, and the power unit 2 rolls in the direction of arrow a and tilts significantly backward, increasing the roll angle, the insulator rubber of the mounting device 9 13 abuts against the stopper body 20, and the insulator rubber 25 of the mounting device 10 abuts against the stopper body 26 to suppress roll motion of the power unit 2 and prevent excessive backward tilting. Conversely, the reverse driving force of power unit 2 increases, and power unit 2 moves toward arrow b.
When the insulator rubber 13 of the mounting device 9 comes into contact with the stopper body 19, when the roll angle increases as the roll movement moves in the direction and tilts forward greatly, the insulator rubber 13 of the mounting device 9 contacts the stopper body 19.
Further, the insulator rubber 25 of the mounting device 10 comes into contact with the stopper body 27, suppressing the roll movement of the power unit 2, and preventing excessive forward tilting. Mounting device 9 of this invention,
According to No. 10, the stopper clearances Cl _FR and Cl RR in the direction in which the power unit 2 deforms in response to the torque reaction force of the reverse driving force are equal to the stopper clearances Cl FR and Cl _RR in the direction in which the power unit 2 deforms in response to the torque reaction force in the forward driving force. Since it is smaller than the stopper clearances Cl _FD and Cl _RD , the range X in which the power unit 2 tilts forward due to roll motion, that is, the gap that must be provided to cause interference with the radiator 5 in front of the power unit 2 Due to the roll movement, the range Y in which the rearward tilt can be made smaller than the gap that must be provided to avoid interference between the rear dash panels. Accordingly, the engine room 1 can be made more compact by reducing the range X in which the power unit 2 tilts forward, and the engine room 1 can be used effectively.

By the way, the insulator rubbers 13 and 15 of the mounting devices 9 and 10 are connected to the stopper body 1.
When the mounting devices 9, 20, 26, and 27 come into contact with each other, the spring constants of the mounting devices 9, 10 become high, making it easier to transmit the vibrations of the power unit 2 to the vehicle body.

According to the mounting devices 9, 10 of this invention, when the power unit 2 generates a large backward driving force, the mounting devices 9, 10 receive this driving torque and move the insulator rubbers 13, 25.
comes into contact with the stopper bodies 19, 27, and the spring constant increases, making it easier to transmit the vibrations of the power unit 2 to the vehicle body. This is the case when driving backwards or applying strong engine braking, which is not often the case in reality, and the effect on the sound and vibration damping characteristics of the vehicle in this case can be almost ignored.

On the other hand, the mounting devices 9 and 10 of this invention
According to the above, because the stopper clearances Cl _FD and Cl _RD between the insulator rubbers 13 and 25 and the stopper bodies 20 and 26 are large, in cases such as when the vehicle is slowly accelerating forward, the insulator The rubbers 13, 25 and the stopper bodies 20, 26 do not come into contact with each other, and the relatively low spring constant of the shear deformation of the insulator rubbers 13, 25 absorbs the vibration of the power unit 2 and blocks its transmission to the vehicle body. be able to.

FIG. 4 graphically illustrates the above explanation. In FIG. 4, the horizontal axis represents the roll angle displacement θ of the power unit 2, and the vertical axis represents the drive torque T generated by the power unit 2. As can be understood from this figure, the torque fluctuation during idling, the torque T _D when stopped in D range of an automatically shifting car, the torque T _A during slow forward acceleration, and the torque T _R during slow reverse acceleration. On the other hand, the mounting devices 9 and 10 absorb the vibrations of the power unit 2 by absorbing them softly with a relatively small spring constant that does not hit the stopper body, and interrupting the transmission to the vehicle body. Large reverse torque such as during sudden reverse acceleration or strong engine braking
For T _B , the mounting devices 9 and 10 prevent the power unit 2 from tilting by being supported by a relatively large spring constant that is in contact with the stopper body. On the other hand, the mounting devices 9 and 10 can support the power unit 2 with a small spring constant and absorb vibrations until the forward torque reaches a relatively large torque. In this way, the stopper clearance in the direction in which the insulator rubbers 13 and 25 of the mounting devices 9 and 10 are deformed in response to the torque reaction force of the reverse drive force of the power unit is determined by the insulator rubber 1
3 and 25 are made smaller than the stopper clearance in the direction of deformation in response to the torque reaction force of the forward driving force of the power unit, the mounting devices 9 and 10 of this invention can make the engine room 1 more compact. At the same time, during forward movement, which is normal driving, the vibration of the power unit 2 is well absorbed, and the vehicle has excellent soundproofing and vibrationproofing properties.

FIG. 5 shows a second embodiment of the mounting device of this invention. This mounting device 9 includes an outer cylinder 11 fixed to a power unit (not shown), an inner cylinder (not shown) disposed inside the outer cylinder 11 and attached to a vehicle body (not shown), the outer cylinder 11 and an inner cylinder (not shown). and an insulator rubber (not shown) that connects the two. The insulator rubber is a protrusion 14 protruding in the axial direction of the mounting device 9,
15, and can come into contact with stopper bodies 19 and 20 that constitute the bracket 10 on the vehicle body side. When this mounting device 9 receives the torque reaction force of the forward driving force of the power unit, it is displaced to the right in the figure, and when it receives the torque reaction force of the reverse driving force, it is displaced to the left in the figure; The total displacement amount D in the direction of displacement in response to the torque reaction force of the force is made larger than the total displacement amount E in the direction of displacement in response to the torque reaction force of the reverse driving force, so that the space in the engine room can be expanded. At the same time, we aim to improve sound and vibration damping properties.

As explained above, according to this idea,
The stopper is designed such that the elastic body deforms in response to the torque reaction force of the reverse drive force of the power unit so as to suppress the roll motion of the power unit due to the torque reaction force of the reverse drive force that does not have a large adverse effect on the sound and vibration isolation performance. Since the clearance is made smaller than the stopper clearance in the direction in which the elastic body deforms in response to the torque reaction force of the forward driving force of the power unit, the permissible range of the roll movement of the power unit is reduced and the sound and vibration damping characteristics are deteriorated. Therefore, the engine room can be made compact. Therefore, the first
By moving the power unit to the front of the vehicle and moving the dash panel relatively forward as in the embodiment shown in the figure, the interior of the vehicle can be made larger. In addition, weight and manufacturing costs can be reduced,
Furthermore, there is an effect that the durability of the elastic body of the mounting device and the exhaust pipe connecting portion can be increased.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a mounting device for a power unit according to a first embodiment of this invention together with the power unit, FIG. A side view showing the device; FIG. 4 is a graph showing the roll characteristics of a power unit equipped with the power unit mounting device of this embodiment;
FIG. 5 is a side view showing a power unit mounting device according to a second embodiment of the invention. 1... Engine room, 2... Power unit, 3... Exhaust pipe, 4... Air cleaner, 5...
Radiator, 6... Dash panel, 7... Hood panel, 8... Floor panel, 9, 10... Mounting device, 11... Outer cylinder, 12... Inner cylinder, 13, 25... Insulator rubber, 1
4, 15... protrusion, 16, 21, 23... bracket, 19, 20, 26, 27... stopper body.

Claims (1)

[Scope of utility model registration request] A power unit for mounting a vibration-proof power unit on a vehicle body, which is an integral combination of an engine with a crankshaft placed in the lateral direction of the vehicle body and a transmission with input and output shafts placed in the lateral direction of the vehicle body. In this mounting device, an elastic body interposed between the power unit and the vehicle body;
a stopper body disposed at a distance from the elastic body by a stopper clearance so that the elastic body comes into contact with the elastic body to suppress the deformation of the elastic body when the deformation of the elastic body reaches a predetermined value or more; The stopper clearance in the direction in which the elastic body deforms in response to the torque reaction force of the backward drive force of the power unit is smaller than the stopper clearance in the direction in which the elastic body deforms in response to the torque reaction force of the forward drive force of the power unit. A power unit mounting device characterized by: