JP2000296719A - Vehicle power plant support system - Google Patents

Abstract

(57) [Problem] To provide a power plant support device for a vehicle, which can prevent transmission of vibration around a torque roll axis which occupies a main part of vibration of the power plant, and can reduce transmission of vibration from the power plant to the vehicle body. . In a power plant support device for a vehicle,
A power plant 1 including an engine 20 and a transmission 30 is mounted on a vehicle, and a front end and a rear end of the power plant 1 are supported by a support member disposed on a torque roll axis T of the power plant 1. At 10 and 10, it is rotatably supported around the torque roll axis T.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plant support device for a vehicle such as a passenger car or a truck, in which a power plant including an engine and a transmission is mounted.

[0002]

2. Description of the Related Art In a conventional vehicle such as a car or truck, a power plant (power train, power unit) including an engine and a transmission (transmission) is provided.
A power plant support device (engine mount) mounted on a vehicle is supported by a plurality of mounting rubbers and the like for vibration isolation, and regulates displacement.

[0003] As shown in FIG.
When the engine 20, the transmission 40, and the clutch case 40 therebetween are considered as an integral rigid body (unit), when the crankshaft is rotated by the operation of the engine 20, the entire unit 1 attempts to rotate. , There is a torque roll axis T which is a rotation axis.

The torque roll axis T is a line passing through the center of gravity G of the power plant 1, and the power plant 1 vibrates most around the torque roll axis T, that is, in the roll direction.

[0005] An external force in a wide frequency range acts on a device supporting the power plant, from low-frequency vibration such as at the time of addressing to high-frequency vibration at the time of high-speed rotation. Therefore, in this power plant supporting apparatus, it is necessary to avoid a resonance phenomenon in a low frequency (30 Hz or less) region and to reduce a vibration transmission rate to a vehicle body in a high frequency (30 Hz or more) region.

Therefore, if the spring constant around the torque roll axis (roll direction) is zero, that is, in a free state where the restoring force is zero, no vibration system is formed around the torque roll axis T, and Since the transmission of the vibration R is lost, as shown in FIG. 7, the elastic member 71 is set so that the spring constant in the direction around the torque roll axis T, that is, the spring constant in the V and V ′ directions shown in FIG. The support between the support portion 22 on the power plant 1 side and the chassis-side bracket 72 fixed to the chassis frame 50 is provided. That is, the torque roll axis T
An elastic member 71 called a mount rubber is arranged and supported on a straight line extending radially from the torque roll axis T in a plane perpendicular to the axis.

However, when the elastic member 71 is formed of rubber (rubber) or a spring, since the elastic member 71 has elasticity in all directions, a support structure as shown in FIG. 7 is employed. In this case, the spring constant around the torque roll axis T cannot be made zero.

If there is a spring characteristic in the V and V 'directions, the distance between the torque roll shaft T and the elastic member 71, that is, the moment lever becomes relatively large. On the other hand, since a vibration system including a spring system is formed, the rotation vibration R around the torque roll axis T over a wide range from low frequency to high frequency cannot be completely cut off. It is difficult to keep the vibration transmission low.

[0009]

Therefore, the passenger car FF
(Front engine front wheel drive)
No. 1729, a power unit support device for a vehicle, and FIG.
The mounting rubber 73 is disposed on the torque roll shaft T as in the supporting device shown in FIG. 1, and the transmission of the rotational vibration R due to the moment force (torque in the roll direction) received by the mounting rubber 73 is reduced to the vehicle body side. There has been proposed a support structure that reduces the transmission of vibration.

However, in the structure in which the power rubber 1 is supported by the mount rubber 73 disposed on the torque roll axis T, since the mount rubber 73 has spring characteristics in all directions, V and V The spring characteristic also occurs in the 'direction, and a spring system is formed with respect to the rotational vibration R about the torque roll axis T, so that the rotational vibration R is transmitted to the chassis side 50.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent transmission of vibration around a torque roll axis, which occupies a major part of vibration of a power plant, so that the power plant It is an object of the present invention to provide a power plant support device for a vehicle that can reduce transmission of vibration to a vehicle.

[0012]

A power plant supporting apparatus for a vehicle for achieving the above object is configured as follows. 1) A power plant composed of an engine and a transmission is mounted on a vehicle, and the front end and the rear end of the power plant are fixed to the torque roll by a support member provided on a torque roll shaft of the power plant. It is configured to be supported rotatably about an axis.

According to the above construction, since the power plant is rotatably supported on the line of the torque roll shaft, the rotational vibration and the roll moment about the torque roll shaft of the power plant are transmitted to the support member. Can be avoided.

Further, since the support members for supporting the power plant are provided at two locations on the axis of the torque roll and the number of the support members is reduced, the vibration transmitted via the support members is reduced. 2) By connecting the power plant to the chassis via a torque rod, a large displacement in the rotation direction of the engine is regulated by the torque rod.

This torque rod is a rod for restricting a relatively large displacement when a large torque is generated such as during acceleration or deceleration and is greatly displaced. The displacement is allowed. 3) More specifically, a bearing is formed on the support member, the shaft of the bearing is aligned with the torque roll shaft and fixed to the chassis side, and the support shaft is mounted on the power plant side. The power plant is supported by being provided so as to coincide with a torque roll shaft, and being rotatably supported by inserting the support shaft into the bearing portion of the support member.

According to the above configuration, the support shaft fixed on the line of the torque roll shaft of the power plant is rotated by the bearing portion of the support member (mount) on the chassis, which is also disposed on the line of the torque roll shaft. Since it is freely supported, it is possible to avoid transmission of rotational vibration and roll moment of the support shaft about the torque roll shaft to the support member.

Therefore, the rotation vibration around the torque roll axis generated in the power plant is prevented from being transmitted to the chassis. 4) Further, in the power plant support device for a vehicle, the support member may include an inner cylinder member having the bearing portion;
And an outer cylinder member fixed to the chassis side, and the inner cylinder member is held by the outer cylinder member via an elastic member.

According to this configuration, since the inner cylindrical member having the bearing portion through which the support shaft is inserted is supported by the outer cylindrical member via the elastic member, a direction perpendicular to the support shaft, that is, in the torque roll shaft. Vibration in the vertical direction can be prevented from being transmitted from the inner cylinder member to the outer cylinder member. 5) By forming the bearing portion of the inner cylinder member of the support member with a rolling bearing, the rotational friction between the support shaft and the inner cylinder member is greatly reduced, so that vibration is transmitted to the chassis side. Is significantly reduced. The bearing of this bearing portion may be a sliding bearing or another bearing, but a rolling bearing is preferred because rotational friction is reduced.

Therefore, according to the power plant supporting apparatus for a vehicle having the above-described structure, the power plant is supported in a state where the rotational displacement having a small amplitude around the torque roll axis of the power plant is free. The rotational vibration around the torque roll axis is not transmitted, and the transmission of vibration to the vehicle body is suppressed.

Further, a large displacement around the torque roll axis generated in the power plant during acceleration or deceleration can be restricted by the torque rod.

Further, since relatively small vibrations other than the rotational vibration around the torque roll axis are cut off by the elastic member between the inner cylinder member and the outer cylinder member of the support member, the transmission of the vibration to the vehicle body side is very large. Become smaller.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a power plant supporting apparatus for a vehicle according to the present invention.

As shown in FIG. 1, a power plant 1 of a vehicle includes an engine 20, a transmission 30, and a clutch case 40 therebetween, and the rotation of the engine 20 is taken out from an output shaft 80.

The torque roll shaft T of the power plant 1
The fixing shafts 21 and 31 formed on the line are rotatably supported by a support member (mount) 10 on the chassis frame 50 side, which is the vehicle body side, whereby the power plant 1 mounted in the front-rear direction of the vehicle is mounted. I support.

The torque roll axis T is a line passing through the center of gravity G of the power plant 1. When the power plant 1 is considered as an integral rigid body (unit), when the crankshaft rotates due to the operation of the engine 20. The power plant 1 vibrates most around the torque roll axis T, that is, in the roll direction.

This torque roll shaft T is generally connected to an output shaft
Unlike the rotation axis N of 80, the output shaft on the line of this rotation axis N
Reference numeral 80 transmits a rotation output to a drive shaft (propeller shaft) 82 via a universal joint 81. Then, the power plant 1 is placed on the line of the torque roll axis T,
Support rotatably. This rotatable support is performed as follows.

On the power plant 1 side, as shown in FIG. 2, a support shaft (shaft) 2 for fixing is placed on the line of the torque roll axis T at the front end and the rear end of the power plant 1.
Attach 1 and 31 with fixing brackets (mission mount brackets) 22 and 32, respectively.

FIG. 2 shows an example in which a support shaft 31 is provided at the rear end of the rear transmission 30. In this structure, the support shaft 31 is joined to a fixing bracket 32 by welding or the like. The fixing bracket 32 is fixed to the transmission 30 by bolts 33. Although not shown, the shaft 21 on the front engine 20 side is similarly configured. On the other hand, on the chassis side, the support frame
A support member 10 called a bush type mounting for supporting the 21 and 31 is provided.

As shown in FIGS. 3 and 4, the support member 10 has an inner cylindrical member 13 having a bearing portion 13d through which the support shafts 21 and 31 are inserted, and a mount that uses the inner cylindrical member 13 as an elastic member. It has an outer cylinder 11 member held via a rubber 12 and is formed in a cylindrical shape. As a material of the mount rubber 12, a vibration-proof rubber such as NR, SBR, IIR or the like can be used. With this mount rubber 12, a vibration in a direction perpendicular to the support shaft 31, that is, in a direction perpendicular to the torque roll axis T is generated. Inner cylinder member 13
From the outer cylinder member 11 can be prevented.

The outer cylinder member 11 is fixed to the chassis by a chassis-side bracket (chassis mount bracket) 14 attached to the chassis frame 50 with bolts 15. The fixing is performed by the shaft of the bearing 13b. The operation is performed so as to coincide with the torque roll axis T.

Further, the bearing portion of the inner cylindrical member 11a of the support member 10
13d is formed by a rolling bearing 13b. This bearing portion 13d may be a sliding bearing because the rotation of the bearing portion 13d, which is the inner peripheral surface of the inner inner cylindrical member 13c, is not required to be transmitted to the outer inner cylindrical member 13a. The bearing 13b has less rotational friction and can more effectively prevent transmission of rotational vibration from the power plant 1.

In order to restrict the axial displacement of the support shafts 21 and 31, as shown in FIG.
4 and 35 are provided on the support shaft 31 side, and rubber cushioning members 11a and 11b are provided on both sides of the outer cylinder member 11 on the support member 10 side.
Is provided. Then, the stopper plates 34, 35 and the buffer members 11a, 11b abut on each other to restrict the displacement in the axis T direction.

Then, the support shaft 31 is moved to the stopper plate 34
After passing through, the bearing portion 13d of the inner cylindrical member 13 is inserted,
Further, the nut 61, the stopper plate 35, and the nut 62 are fitted in order from the tip side of the support shaft 31 protruding from the bearing portion 13d,
The nuts 61 and 62 are tightened to support the support shaft 31 so that the rotation direction of the support shaft 31 is free to rotate. Also, the support shaft 21 on the engine 20 side
Are also supported by the support member 10 in the same manner.

Thus, the power plant 1 is rotated around the torque roll axis T by the support shafts 21 and 31 provided on both ends of the torque roll axis T and the support members 10 and 10 provided on the chassis side 50. It will be freely supported.

In addition, when the power plant 1 generates a large torque, the power plant 1 is largely displaced by supporting only these two points. Therefore, the power plant 1 needs to be fixed to the torque roll shaft T. Therefore, in order to suppress the force in the rotational direction of the engine 20, a torque rod 60 is provided with one end connected to the clutch case 40 and the other end connected to the chassis frame 50, as shown in FIG.

The torque rod 60 is a rod for receiving only a force in the rotational direction of the engine 20 when a large torque is generated at the time of acceleration, deceleration, or the like, and relatively displaced. As for the small rotational vibration R about the torque roll axis T, the small vibration displacement is allowed.

The torque rod 60 is connected to the power plant 1
The support member 25 provided on the side is loosely fitted. The play (gap) in the loosely fitted state allows a small rotational vibration R, and when the displacement increases, the support member 25
Is formed so as to abut on the supporting portion 60a of the first member and restrict the displacement. Since the torque rod 60 has a structure that receives only the force in the rotation direction of the engine 20, the transmission of vibrations other than in the rotation direction is almost shut off.

In addition, when the engine load is small, the generated torque is small and the displacement is also small when the vibration R in the rotational direction is small, so that the support member 25 is unlikely to contact the torque rod 60, and Also, the force acting on the torque rod 60 is small, and the transmission of vibration via the torque rod 60 can be suppressed low.

The power rod 1 is prevented from being excessively displaced by the torque rod 60, and the power plant 1, the exhaust system components,
It is possible to prevent the occurrence of damage or functional failure due to interference with adjacent components such as operation system components, piping system components, and wiring system components. Therefore, the vibration transmitted to the chassis (body) via the torque rod 60 is extremely small.

According to the power plant support structure having the above structure, the power plant 1 is supported by the bush type support member 10 having the bearing portion 13b on the chassis side 50 so as to be rotatable around the torque roll axis T of the power plant 1. Therefore, the torque roll shaft T, which is the main vibration source of the power plant 1,
The surrounding rotational vibration R can be cut off, and the vibration due to the operation of the engine 20 can be suppressed from being transmitted to the chassis side 50, so that significant vibration reduction can be achieved. Further, the torque rod 60 can restrict a large displacement about the torque roll axis T of the power plant 1.

[0041]

As described above, according to the power plant support structure of the present invention, the bush type support member having the bearing portion is provided on the chassis side, and the power plant is rotatable around the torque roll axis. The support prevents the transmission of rotational vibration with relatively small amplitude around the torque roll axis, which is the main vibration source of the power plant, to the chassis side, and achieves a significant reduction in vibration on the vehicle body side. it can.

Further, since a torque rod for regulating a relatively large displacement in the rotation direction of the engine is provided, the torque generated when the engine is accelerated or decelerated is large and the rotational displacement around the torque roll axis becomes large. Since the displacement can be regulated, damage or failure due to excessive displacement can be prevented.

In particular, the force acting on this torque rod is
When the engine load is small, the vibration is small and the transmission of vibration via the torque rod is suppressed to a low level, so that the vibration transmitted to the vehicle body can be extremely reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a power plant showing a support structure of the power plant according to the present invention.

FIG. 2 is a schematic side view of a support member showing a power plant support structure according to the present invention.

FIG. 3 is a perspective view of a support member according to the present invention.

FIG. 4 is a side view of the support member according to the present invention, in which an upper half shows a cross section.

FIG. 5 is a schematic perspective view of the power plant as viewed from a direction B in FIG. 1, showing a torque rod according to the present invention.

FIG. 6 is a schematic side view of the power plant showing a torque roll axis of the power plant.

FIG. 7 is a schematic cross-sectional view showing a support structure of a power plant according to the related art, corresponding to a U-U cross section in FIG. 6;

FIG. 8 is a side view showing another conventional power plant support structure.

[Explanation of symbols]

 Reference Signs List 1 power plant 10 support member (mount) 11 outer cylinder member 12 elastic member (mount rubber) 13 inner cylinder member 13b rolling bearing 13d bearing section 20 engine 21, 31 support shaft 30 transmission 40 crankcase 50 chassis (chassis frame) T torque Roll axis

Claims (5)

[Claims] 1. A power plant including an engine and a transmission is mounted on a vehicle, and a front end and a rear end of the power plant are supported by support members provided on a torque roll shaft of the power plant. A power plant support device for a vehicle, wherein the device is supported rotatably about the torque roll axis. 2. The power plant support device for a vehicle according to claim 1, wherein the power plant is connected to a chassis via a torque rod. 3. A bearing portion is formed on the support member, the shaft of the bearing portion is aligned with the torque roll axis and fixed to the chassis side, and the support shaft is aligned with the power plant side on the torque roll axis. The power plant support according to claim 1 or 2, wherein the power plant is supported by being provided so as to be rotatably supported by inserting the support shaft into the bearing portion of the support member. apparatus. 4. The support member is formed to have an inner cylinder member having the bearing portion and an outer cylinder member fixed to a chassis, and the inner cylinder member is connected to the outer cylinder via an elastic member. 4. The holding member according to claim 1, wherein said holding member is a cylindrical member.
A power plant support device for a vehicle according to any one of the above. 5. The bearing according to claim 1, wherein said bearing portion of said inner cylindrical member of said support member is formed of a rolling bearing.
5. The power plant support device for a vehicle according to any one of 4.