JP2012051431A - Power train supporting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the vibration transmitted from a torque rod to a vehicle body while suppressing the vibration of a power train.SOLUTION: In a power train supporting apparatus, a power train having an engine, a transmission and a transfer is mounted in an engine room of a vehicle, a propeller shaft for transmitting the driving force to rear wheels is connected to the transfer, both ends in the vehicle width direction of the power train are supported by the vehicle body via a mount device, and the oscillation of the power train is regulated by the torque rod extending in the longitudinal direction of the vehicle. The torque rod is arranged immediately below the propeller shaft to be along the axial direction of the propeller shaft. The transfer has a connection part of a front wheel side drive shaft on a front part of the vehicle. A fore end of the torque rod is connected to a lower part of the connection part of the drive shaft.

Description

  The present invention relates to a powertrain support device, and more particularly, to a powertrain that reduces vibrations input to a vehicle body by optimizing the arrangement of a torque rod that regulates swinging of a powertrain having an engine, a transmission, and a transfer. The present invention relates to a support device.

The power train mounted in the engine room of the vehicle has an engine and a transmission connected in the vehicle width direction, a transfer connected to the rear of the engine and the transmission, and a propeller shaft that transmits driving force to the rear wheels. There is a concatenation. In this powertrain support device, both ends of the powertrain in the vehicle width direction are connected to the vehicle body by a mounting device, and the vehicle rear portion of the powertrain is connected to the vehicle body by a torque rod extending in the vehicle front-rear direction to swing the powertrain. It is regulated.
In the powertrain support device, it is desirable to arrange the position of the torque rod in the vehicle width direction at the position of the center of gravity of the powertrain. Moreover, the torque rod has connected the rear-end part to the sub-frame of the engine room rear part. Both ends of the sub frame are connected to side members arranged on the left and right. For vehicles with two-wheel drive and four-wheel drive specifications, the subframe to which the rear end of the torque rod is attached is two-wheel drive and four-wheel in consideration of cost, productivity, and factory installation. It is desirable to share the drive.
2. Description of the Related Art Generally, a powertrain support device for a two-wheel drive vehicle uses a boss portion of a transmission case mating surface of a transmission and fixes and supports a front end portion of a torque rod. In the case of a four-wheel drive vehicle, since the transfer is arranged, the torque rod is arranged on the lower surface of the transfer, and the arrangement of the front end portion of the torque rod is limited due to the ground clearance. I couldn't. Further, when connecting the front end of the torque rod to the transfer, there is a concern about the strength of the transfer.

Conventionally, when a sub-frame is shared between a two-wheel drive vehicle and a four-wheel drive vehicle, the torque rod length is arranged to be extremely short so that the front end of the torque rod is not arranged on the lower surface of the transfer, It was fixed to the case. However, because the torque rod is shortened in length, the front end moves away from the center of gravity of the power plant, so that not only the front-rear direction but also the vertical input can be entered at the rear end. In order to suppress the movement, it was necessary to enlarge the rear end. If the input cannot be regulated, a measure to increase the opening on the side of the subframe where the rear end of the torque rod is attached can be considered, but this results in lowering the rigidity value of the subframe, and the subframe is also secured to ensure rigidity. The weight increases due to increased thickness, etc., creating a vicious circle.
If the front end of the torque rod is placed at a low position on the power train, there is a problem that the front end may be damaged by rolling stones or the like from the road surface during travel, and a separate sheet metal bracket is attached to the front end. There are also supporting devices.

Some conventional powertrain support devices have a torque rod attached to one end of the powertrain in the vehicle width direction and connect the powertrain and the vehicle body via the torque rod. (Japanese Patent Laid-Open No. 2008-1000067)
In addition, there is a conventional powertrain support device in which a torque rod that connects the powertrain and the vehicle body is disposed near the center of gravity of the powertrain and disposed at the lower end of the powertrain. (Japanese Patent Laid-Open No. 2007-331645)

JP 2008-1000067 A JP 2007-331645 A

However, in the structure as disclosed in Patent Document 1, when the power train swings in the vehicle front-rear direction, the movement of one end of the power train is restricted by the torque rod, so that the vehicle at the other end starts from that one end. As the amplitude in the front-rear direction increases, there is a problem that a bending moment is applied to the torque rod and the vibration input to the torque rod increases.
Moreover, in the structure like patent document 2, since the torque rod is attached in the state which protruded below from the lower end of the power train at the rear end of the power train, There is a problem that the distance from the torque rod to the bush increases, the vibration in the vehicle vertical direction input from the power train to the torque rod increases, and the vibration transmitted from the torque rod to the vehicle body increases.

  An object of the present invention is to reduce vibration transmitted from a torque rod to a vehicle body while suppressing vibration of the power train in a power train support device.

  The present invention includes a power train having an engine, a transmission coupled to an end of the engine in the vehicle width direction, and a transfer coupled to a rear portion of the transmission and a rear portion of the engine in an engine room of the vehicle. Then, a propeller shaft for transmitting driving force to the rear wheels is connected to the transfer, both ends of the power train in the vehicle width direction are supported on the vehicle body by a mounting device, and the power train is shaken by a torque rod extending in the vehicle front-rear direction. In a powertrain support device that regulates movement, the torque rod is disposed directly below the propeller shaft so as to be along the axial direction of the propeller shaft, and the transfer has a front wheel side drive shaft connecting portion at a vehicle front side portion. Prepare under the connecting part of this drive shaft Wherein the the portion obtained by connecting the tip portion of the torque rod.

In the present invention, the power train is mounted in the engine room so as to be placed horizontally, and the transfer and the propeller shaft are connected to the rear part of the transmission and the rear part of the engine. Therefore, due to the heavy transfer, the center of gravity of the power train moves from the vicinity of the center of the power train toward the transmission in the vehicle width direction, and further from the center of the power train toward the transfer in the vehicle front-rear direction. As a result, the center of gravity of the power train of the present invention is approximately near the axis of the propeller shaft.
In the present invention, the torque rod is mounted near the center of gravity of the power train in the vehicle width direction by the structure in which the torque rod is disposed directly below the axial direction of the propeller shaft, so that the power train swings in the vehicle longitudinal direction. In this case, it is possible to prevent the one end in the vehicle width direction of the power train away from the connecting point of the torque rod from greatly swinging in the vehicle front-rear direction. Moreover, this invention can suppress the input of the bending moment to a torque rod by this structure.
Further, according to the present invention, the front end of the torque rod is connected to the lower portion of the front wheel side drive shaft connecting portion provided on the front side of the transfer, so that the front end of the torque rod is connected to the center of the powertrain in the vehicle longitudinal direction. Therefore, when the powertrain rolls, the vehicle vertical vibration input to the tip of the torque rod can be reduced, and the vehicle vertical vibration input from the torque rod to the vehicle body can be reduced. Can be reduced.

It is a top view of a vehicle. (Example) It is a bottom view of the vehicle front part. (Example) It is a side view of a vehicle front part. (Example) FIG. 4 is an enlarged side view around the torque rod of FIG. 3. (Example) FIG. 5 is a side view showing the positional relationship between the torque rod transfer of FIG. 4 and a subframe. (Example)

  Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention. 1-3, 1 is a vehicle, 2 is a vehicle body, 3 is a right side member, 4 is a left side member, 5 is a subframe, 6 is a dash panel, 7 is an engine room, and 8 is a vehicle compartment. The vehicle 1 has an engine room 7 on the front side of a dash panel 6 on a subframe 5 connecting the right side member 3 and the left side member 4, and a vehicle compartment 8 on the rear side of the dash panel 6. The engine room 7 includes a horizontally installed engine 9, a transmission 10 connected to the left end of the engine 9 in the vehicle width direction, and a transfer connected to the rear of the transmission 10 and closer to the rear of the engine 9. 11 is mounted.
As shown in FIGS. 2 and 3, the transfer 11 includes a right connecting portion 16 and a left connecting portion 17 that connect a right front wheel side drive shaft 14 and a left front wheel side drive shaft 15 to the left and right of the vehicle front side portion of the main body portion 13. And a rear connecting portion 19 that connects the propeller shaft 18 to the vehicle rear side portion of the main body portion 13. The right front wheel side drive shaft 14 and the left front wheel side drive shaft 15 transmit driving force to the right front wheel 20 and the left front wheel 21 as shown in FIG. The propeller shaft 18 transmits a driving force to the right rear wheel 25 and the left rear wheel 26 through the right rear wheel side drive shaft 23 and the left rear wheel side drive shaft 24 via the rear wheel side differential 22. Therefore, this vehicle 1 is a four-wheel drive vehicle.

As shown in FIGS. 2 and 3, the support device 27 for supporting the power train 12 on the vehicle body 2 supports both ends of the vehicle width direction on the vehicle body 2 by a right side mount device 28 and a left side mount device 29. The rear end is supported on the vehicle body 2 by a torque rod 30 extending in the vehicle front-rear direction. The right mounting device 28 supports the right end portion of the engine 9 in the vehicle width direction on the right side panel. The left mounting device 29 supports the left side panel of the transmission 10 in the vehicle width direction.
As shown in FIGS. 4 and 5, the torque rod 30 includes a front bush 31 at the front end in the vehicle front-rear direction, and a rear bush 32 at the rear end in the vehicle front-rear direction. The front bush 31 includes an outer cylinder 33 that is oriented in the vehicle width direction, an inner cylinder 34 that is coaxially disposed in the outer cylinder 33, and an elastic member 35 that connects the outer cylinder 33 and the inner cylinder 34. The front bush 31 is attached to the front end of the torque rod 30 in the vehicle front-rear direction with a mounting bolt 36 inserted through the inner cylinder 34. The rear bush 32 includes an outer cylinder 37 that is oriented in the vehicle vertical direction, an inner cylinder 38 that is coaxially disposed in the outer cylinder 37, and an elastic member 39 that connects the outer cylinder 37 and the inner cylinder 38. The rear bush 32 has the outer cylinder 37 fixed to the rear end of the torque rod 30 in the vehicle front-rear direction.
The torque rod 30 connects the transfer 11 to the subframe 5 by a front bush 31 and a rear bush 32, and restricts the swing of the power train 12 supported by the right mount device 28 and the left mount device 29 in the vehicle front-rear direction. .

As shown in FIGS. 2 and 3, the support device 27 of the power train 12 has the torque rod 30 disposed directly below the propeller shaft 18 so as to be along the direction of the axis C <b> 1 of the propeller shaft 18. The transfer 11 includes a front bush 31 provided at the tip of the torque rod 30 at a portion below the right connecting portion 16 of the right front wheel drive shaft 14 of the main body 13 and a left connecting portion 17 of the left front wheel drive shaft 15. Are connected.
As described above, the support device 27 for the power train 12 is mounted in the engine room 7 so that the power train 12 is placed horizontally, and the transfer 11, the propeller shaft 18, and the rear part of the transmission 10 and the rear part of the engine 9. Are connected. Therefore, the center of gravity G of the powertrain 12 in the vehicle width direction is shifted from the vicinity of the center of the powertrain 12 toward the transmission 10 as shown in FIG. Move from the center of the train 12 toward the transfer 11. As a result, the center of gravity G of the power train 12 is in the vicinity of the axis C1 of the propeller shaft 18 extended in a bottom view.
In the support device 27 of the power train 12, the torque rod 30 is arranged directly below the axis C direction of the propeller shaft 18 so that the torque rod 30 passes through the center of gravity G of the power train 12 in the vehicle width direction. When the power train 12 swings in the vehicle front-rear direction by being attached in the vicinity of the axis C2 extending to the vehicle, one end in the vehicle width direction of the power train 12 away from the connecting point of the torque rod 30 swings greatly in the vehicle front-rear direction. Can be prevented. Moreover, the support device 27 of the power train 12 can suppress the input of the bending moment to the torque rod 30 by this structure.
Further, in the power train 12 support device 27, torque is applied to the lower portion of the right connecting portion 16 of the right front wheel drive shaft 14 and the left connecting portion 17 of the left front wheel drive shaft 15 provided on the front side of the transfer 11. With the structure in which the front bush 31 at the tip end of the rod 30 is connected, the tip end of the torque rod 30 can be brought close to the center of gravity G of the power train 12 in the vehicle front-rear direction. For this reason, the support device 27 of the power train 12 is located below the center of gravity G and in the vicinity of the center of gravity G when the power train 12 rolls around the right mount device 28 and the left mount device 28 above the center of gravity G. The vibration in the vehicle vertical direction input to the tip of the connected torque rod 30 can be reduced, and the vibration in the vehicle vertical direction input from the torque rod 30 to the vehicle body 2 via the subframe 5 can be reduced.

As shown in FIGS. 4 and 5, the transfer 11 includes a reinforcing rib 40 on the outer periphery of the lower portion of the main body 13. The reinforcing rib 40 accommodates the outer cylinder 33 of the front bush 31 attached to the front side of the torque rod 30. A notch 41 is formed. Two mounting boss portions 42, 43 extending from the main body portion 13 toward a mounting portion 44 described below are integrally formed with the reinforcing rib 40 at both ends in the vehicle front-rear direction of the notch portion 41. A mounting portion 44 is fixed to the outer cylinder 33 of the front bush 31. The front bush 31 connects the reinforcing ribs 40 by attaching attachment portions 44 fixed to the outer cylinder 33 to attachment boss portions 42 and 43 at both ends of the notch portion 41 in the vehicle front-rear direction.
The rear bush 32 attached to the rear side of the torque rod 30 is inserted into the inside through an attachment opening 45 formed in the subframe 5 and attached to the subframe 5 with a mounting bolt.
As described above, the support device 27 of the power train 12 includes the mounting boss portions 42 and 43 at both ends in the vehicle front-rear direction of the notch portion 41 formed in the reinforcing rib 40 on the lower outer periphery of the transfer 11, and the front bush 31 of the torque rod 30. Since the front bush 31 of the torque rod 30 can be accommodated in the notch 41 formed in the reinforcing rib 40 of the transfer 11 by the structure connected by the mounting portion 44 fixed to the outer cylinder 33, the lower portion of the power train 12 is lowered. Thus, the torque rod 30 can be disposed below the transfer 11 without protruding the torque rod 30, and the front bush 31 can be reliably brought close to the center of gravity G of the power train 12.
Further, even if the support device 27 of the power train 12 forms the notch 41 in the reinforcing rib 40 below the transfer 11, the mounting bosses 42 and 43 at both ends in the vehicle front-rear direction of the notch 41 are connected to the front bush 31. By connecting with the mounting portion 44 fixed to the outer cylinder 33, vibration of the power train 12 can be suppressed without reducing the rigidity of the transfer 11. In addition, the support device 27 of the power train 12 can prevent the elastic member 35 of the front bush 31 from being damaged by stones or the like that have jumped up from the road surface 46 during traveling.

Further, attachment boss portions 42 and 43 extending from the main body portion 13 of the transfer 11 toward the attachment portion 44 are formed at both ends of the cutout portion 41 in the vehicle front-rear direction.
Thus, the support device 27 of the power train 12 has mounting boss portions 42 and 43 to which mounting portions 44 fixed to the front bush 31 of the torque rod 30 are mounted in the vicinity of both ends of the notch portion 41 in the vehicle front-rear direction. Depending on the structure, the mounting boss portions 42 and 43 can reinforce the transfer 11 to increase the rigidity of the transfer 11, and the vibration of the power train 12 can be suppressed.

Further, the transfer 11 includes a rear connection portion 19 of the propeller shaft 18 that connects the propeller shaft 18 to the main body portion 13, and a right connection portion 16 of the right front wheel drive shaft 14 and a left connection of the left front wheel drive shaft 15. The rear connecting portion 19 is disposed above the vehicle from the portion 17.
As a result, the support device 27 of the power train 12 has a rear connecting portion 19 of the propeller shaft 18 above the vehicle relative to the right connecting portion 16 of the right front wheel drive shaft 14 and the left connecting portion 17 of the left front wheel drive shaft 15. Can be attached to the transfer 11 so that the propeller shaft 18 is positioned above the right front wheel side drive shaft 14 and the left front wheel side drive shaft 15 in the vertical direction of the vehicle. The space for arranging the torque rod 30 formed in the above can be expanded upward.
As a result, the support device 27 of the power train 12 can securely place the torque rod 30 directly below the propeller shaft 18 and can place the torque rod 30 at a higher position than the conventional structure. The portion can be easily connected to a position close to the center of gravity G of the power train 12.

  The present invention can reduce vibration transmitted from the torque rod to the vehicle body while suppressing vibration of the power train, and can also be applied to vehicles other than automobiles equipped with a power unit such as an engine.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car body 3 Right side member 4 Left side member 5 Subframe 7 Engine room 9 Engine 10 Transmission 11 Transfer 12 Powertrain 13 Main part 14 Right front wheel side drive shaft 15 Left front wheel side drive shaft 16 Right side connection part 17 Left side connection part 18 Propeller shaft 19 Rear side connecting portion 28 Right side mounting device 29 Left side mounting device 30 Torque rod 31 Front side bush 32 Rear side bush 33 Outer cylinder rib 40 Reinforcement 41 Notch portion 42 Mounting boss portion 43 Mounting boss portion 44 Mounting portion

Claims (4)

A power train having an engine, a transmission connected to an end of the engine in the vehicle width direction, and a transfer connected to a rear portion of the transmission and a rear portion of the engine is mounted in an engine room of the vehicle,
A propeller shaft that transmits driving force to the rear wheel is connected to the transfer,
Both ends of the power train in the vehicle width direction are supported on the vehicle body by a mounting device,
In a powertrain support device that regulates rocking of the powertrain by a torque rod extending in the vehicle longitudinal direction,
The torque rod is arranged directly below the propeller shaft so as to be along the axial direction of the propeller shaft,
The transfer is provided with a connecting portion of a front wheel side drive shaft on a front side portion of the vehicle, and a front end portion of the torque rod is connected to a portion below the connecting portion of the drive shaft. The transfer is provided with a reinforcing rib on the outer periphery of the lower part, and the reinforcing rib is formed with a notch for housing a bush attached to the front side of the torque rod,
2. The powertrain support device according to claim 1, wherein both end portions in the vehicle front-rear direction of the notch portion are connected by attachment portions fixed to the outer cylinder of the bush.   3. The powertrain support device according to claim 2, wherein an attachment boss portion extending from the main body portion of the transfer toward the attachment portion is formed at both ends of the cutout portion in the vehicle front-rear direction.   2. The power according to claim 1, wherein the transfer includes a propeller shaft coupling portion that couples the propeller shaft, and the propeller shaft coupling portion is disposed above the drive shaft coupling portion. Train support device.

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