JP7275549B2 - Support structure for vehicle power unit - Google Patents

Description

The present invention relates to a support structure for a vehicle power unit.

2. Description of the Related Art Conventionally, there is known a power unit mount structure in which a power unit including an engine body with a crankshaft arranged vertically and a transmission is supported on a vehicle body (see Patent Document 1).

In this power unit mounting structure, both the left and right sides of the engine body and the rear side of the transmission are supported by the vehicle body via mounting devices. A drive shaft (propeller shaft) is connected to the rear end of the transmission, and the front end of the drive shaft is inserted into the rear end of the transmission from behind.

JP-A-2011-31844

However, in such a conventional power unit mounting structure, when an excessive load is applied to the vehicle from the front due to, for example, a frontal collision of the vehicle, the excessive load is applied to the mounting device at the rear of the transmission. This mounting device may be deformed.

As a result, the power unit is largely displaced forward due to the deformation of the mount device, and there is a risk that the front end portion of the drive shaft and the rear end portion of the transmission cannot be connected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is capable of suppressing the movement of the power unit forward of the vehicle when an excessive load is applied to the vehicle from the front of the vehicle. It is an object of the present invention to provide a support structure for a vehicle power unit that can maintain connection with a shaft.

The present invention has an internal combustion engine installed so that an output shaft extends in the front-rear direction, a transmission attached to the rear end of the internal combustion engine, and a front end portion of a propeller shaft that transmits power to rear wheels. is inserted into the rear end of the transmission; a left mount device and a right mount device for elastically supporting the internal combustion engine on a vehicle body member; a vehicle power unit support structure having a rear mount device for supporting the power unit on the vehicle body, wherein the rear mount device includes a vehicle body side bracket connected to the vehicle body member and a transmission side bracket connected to a rear portion of the transmission. and a vibration isolating member for elastically connecting the vehicle body side bracket and the transmission side bracket, wherein the transmission side bracket includes a first connecting portion connected to the transmission, and the vibration isolating member. a second connecting portion connected to a member; and a connecting portion connecting the first connecting portion and the second connecting portion, wherein the second connecting portion is connected to the first connecting portion A guide member is provided at a higher position than the transmission, and is positioned forward of the second connection portion and extends upward from the transmission, and the communication portion and the An upper portion of the transmission is connected by a reinforcing member extending in the longitudinal direction of the vehicle, and the reinforcing member is attached to the connecting portion at a position closer to the second connecting portion than to the first connecting portion in the vertical direction. A rear end portion of the reinforcing member is connected to the connecting portion at a position overlapping the second connecting portion in the vertical direction, and the reinforcing member extends from the connecting portion in a side view of the vehicle. It extends horizontally and has a front end connected to the guide member .

As described above, according to the present invention, when an excessive load is applied to the vehicle from the front of the vehicle, the power unit can be prevented from moving forward of the vehicle, and the transmission and the propeller shaft can be kept connected.

FIG. 1 is a plan view of a vehicle equipped with a vehicle power unit according to one embodiment of the present invention. FIG. 2 is a left side view of the vehicle power unit according to one embodiment of the present invention. FIG. 3 is a rear view of the vehicle power unit according to one embodiment of the present invention. FIG. 4 is a lower left perspective view of a vehicle power unit according to an embodiment of the present invention. FIG. 5 is a diagram showing the positional relationship between the transmission and the center cross member of the vehicle power unit according to one embodiment of the present invention.

A vehicle power unit support structure according to an embodiment of the present invention includes an internal combustion engine installed such that an output shaft extends in a longitudinal direction, and a transmission attached to a rear end portion of the internal combustion engine, A vehicle power unit in which the front end of a propeller shaft that transmits power to rear wheels is inserted into the rear end of a transmission, a left mount device and a right mount device that elastically support an internal combustion engine to a vehicle body member, and a transmission and a rear mount device for elastically supporting a rear portion of the power unit to a vehicle body member, wherein the rear mount device is connected to a vehicle body-side bracket connected to the vehicle body member and to a rear portion of the transmission. A transmission-side bracket and a vibration isolating member for elastically connecting the vehicle body-side bracket and the transmission-side bracket, wherein the transmission-side bracket includes a first connection portion connected to the transmission, and a vibration isolating member. It has a second connecting portion connected to the member and a connecting portion connecting the first connecting portion and the second connecting portion, and the second connecting portion is positioned higher than the first connecting portion. The connecting portion and the upper portion of the transmission are connected by a reinforcing member extending in the longitudinal direction of the vehicle.

As a result, the vehicle power unit support structure according to the embodiment of the present invention can suppress the power unit from moving forward of the vehicle when an excessive load is applied to the vehicle from the front of the vehicle. Maintains connection with the propeller shaft.

A support structure for a vehicle power unit according to an embodiment of the present invention will be described below with reference to the drawings.

1 to 5 are diagrams showing a support structure for a vehicle power unit according to one embodiment of the present invention. 1 to 5, the vertical, front, rear, left, and right directions are the vertical, front, rear, left, and right directions of the vehicle power unit installed in the vehicle, and the left and right directions are the directions perpendicular to the front-rear direction of the vehicle, and the height of the vehicle power unit. The direction is vertical.

First, the configuration will be explained.
In FIG. 1, a vehicle 1 includes a left side frame 2L and a right side frame 2R. there is

The left side frame 2L and the right side frame 2R are connected by a front upper cross member 3A, a center cross member 4 and a rear cross member 5 in order from the front side. Front upper cross member 3</b>A, center cross member 4 and rear cross member 5 extend in the width direction of vehicle 1 .

As shown in FIG. 3, a front lower cross member 3B is provided below the front upper cross member 3A. The front lower cross member 3B is installed so as to overlap the front upper cross member 3A in the front-rear direction. The front lower cross member 3B extends in the width direction of the vehicle 1 and connects the left side frame 2L and the right side frame 2R.

The left side frame 2L, the right side frame 2R, the front upper cross member 3A, the front lower cross member 3B, the center cross member 4 and the rear cross member 5 of this embodiment constitute the vehicle body member of the present invention.

In FIG. 1, a vehicle 1 is provided with a vehicle power unit (hereinafter referred to as a power unit) 6 . The power unit 6 includes an engine 7 as an internal combustion engine that converts thermal energy into mechanical energy, and a transmission 8 that changes the rotational speed of the engine 7 and outputs the same.

The engine 7 has a crankshaft 7A indicated by a phantom line, and the crankshaft 7A extends in the longitudinal direction of the vehicle 1 . That is, the engine 7 is installed vertically so that the crankshaft 7A extends in the front-rear direction. The crankshaft 7A of this embodiment constitutes the output shaft of the present invention.

In FIG. 2 , the transmission 8 includes a transmission case 9 , and the transmission case 9 includes a transmission case 10 , a disk-shaped intermediate plate 11 and an extension case 12 .

The transmission case 10 is connected to the rear end of the engine 7 with bolts (not shown). The extension case 12 is installed behind the transmission case 10, and the transmission case 10 and the extension case 12 accommodate a transmission mechanism to which power is transmitted from the crankshaft 7A.

The transmission mechanism, for example, connects an input shaft, an output shaft, and the input shaft and the output shaft, both of which are not shown, and is provided so as to be able to connect the input shaft and the output shaft, thereby establishing a plurality of gear stages. accommodates a transmission mechanism comprising a plurality of transmission gears and the like for transmitting power from the input shaft to the output shaft. The configuration of the speed change mechanism is not particularly limited.

The rear end of the transmission case 10 is open, and the front end of the extension case 12 is open. The intermediate plate 11 is installed between the open end of the transmission case 10 and the open end of the extension case 12 to connect the transmission case 10 and the extension case 12 . The intermediate plate 11 is formed with openings (not shown) through which the input shaft and the output shaft pass.

A cylindrical propeller shaft insertion portion 12A is provided at the rear end portion of the extension case 12, and the front end portion of the propeller shaft 13 is inserted into the propeller shaft insertion portion 12A.

Specifically, a sliding yoke 15 is connected to the front end portion of the propeller shaft 13 via a cross spider 14, and the sliding yoke 15 is inserted into the propeller shaft insertion portion 12A from the rear to extend the extension case 12. , that is, the rear end of the transmission 8 .

The sliding yoke 15 is movable in the longitudinal direction with respect to the propeller shaft insertion portion 12A, and the propeller shaft 13 is allowed to move in the longitudinal direction.

A front end portion of the sliding yoke 15 is spline-fitted to the output shaft of the transmission 8, and the propeller shaft 13 receives power from the output shaft.

The propeller shaft 13 extends rearward from the transmission 8 and is connected to a differential device 17 via a cross spider 16 provided at its rear end (see FIG. 1).

A propeller shaft 13 of this embodiment includes a cross spider 14 and a sliding yoke 15 . The transmission case 10 constitutes the front case of the present invention, and the extension case 12 constitutes the rear case of the present invention.

In FIG. 1, the differential device 17 is connected to left and right rear wheels 19L and 19R via left and right drive shafts 18L and 18R. It is distributed to the left and right rear wheels 19L, 19R via the drive shafts 18L, 18R.

As shown in FIG. 3, the engine 7 is installed such that the cylinder shaft 7B is tilted to the left with respect to the transmission 8. As shown in FIG. The left side surface of the engine 7 is elastically supported on the front lower cross member 3B by the left mounting device 20L, and the right side surface of the engine 7 is elastically supported on the front lower cross member 3B by the right mounting device 20R. there is

2 and 4, the rear portion of the transmission 8, that is, the rear portion of the extension case 12 is elastically supported on the center cross member 4 by a rear mounting device 21. As shown in FIG.

The rear mount device 21 has a vehicle body side bracket 22 and a transmission side bracket 23 . The vehicle body side bracket 22 is fixed to the center cross member 4 and extends downward from the center cross member 4 .

The transmission-side bracket 23 includes first connecting portions 23A and 23B, a second connecting portion 23C, and connecting portions 23D and 23E connecting the first connecting portions 23A and 23B and the second connecting portion 23C. It has The first connecting portions 23A, 23B, the second connecting portion 23C, and the communicating portions 23D, 23E are integrally formed.

The communication portion 23E is branched from the communication portion 23D, and the communication portion 23D and the communication portion 23E are formed in a bifurcated shape. The first connecting portions 23A and 23B are connected to the extension case 12 by a plurality of bolts 24A so as to sandwich the portion of the extension case 12 above the propeller shaft insertion portion 12A (see FIG. 3).

A vibration isolating member 25 made of an elastic material such as rubber is connected to the second connecting portion 23C. The vibration isolating member 25 is connected to the vehicle body side bracket 22 by a bolt 24B, and elastically connects the vehicle body side bracket 22 and the transmission side bracket 23 .

The second connecting portion 23C is installed at a position higher than the first connecting portions 23A and 23B and behind the first connecting portions 23A and 23B.

A reinforcing member 26 is provided in the vehicle 1 . The reinforcing member 26 extends in the front-rear direction and connects the upper portion of the extension case 12 and the connecting portion 23D (see FIG. 5).

As shown in FIG. 2, the rear end portion of the reinforcing member 26 is installed at a position closer to the second connecting portion 23C than the first connecting portion 23A in the vertical direction, and is secured by the bolt 24C (see FIG. 5). It is connected to the front end of the connecting portion 23D.

A guide member 27 is provided in the upper portion of the transmission 8, more specifically, in the upper portion of the intermediate plate 11. The guide member 27 is located forward of the second connecting portion 23C and extends upward from the intermediate plate 11. extends to

In the rear mount device 21 of this embodiment, the first connecting portions 23A and 23B are connected to the extension case 12, and the reinforcing member 26 extends horizontally from the connecting portion 23D in a side view (left side view) of the vehicle 1. and its front end is connected to a guide member 27 by a bolt 24D (see FIG. 5). That is, the front end portion of the reinforcement member 26 is connected to the intermediate plate 11 via the guide member 27 .

2 and 4, first connecting portions 23A and 23B and a boss portion 28 are provided above the propeller shaft insertion portion 12A. The boss portion 28 extends in the front-rear direction and is connected to the upper portion of the propeller shaft insertion portion 12A.

A connecting member 29 is fastened to the rear portion of the communicating portion 23D and the boss portion 28 by bolts 24E and 24F, and the connecting member 29 is fastened to the branching portion of the communicating portion 23D and the communicating portion 23E by a bolt 24E.

Thereby, the rear portion of the communication portion 23</b>D and the boss portion 28 are vertically connected by the connecting member 29 . As shown in FIG. 3, the connecting member 29 is installed at a position overlapping the first connecting portion 23A in the vertical direction of the vehicle.

Next, the action will be explained.
If an excessive load is applied to the vehicle 1 from the front due to a frontal collision of the vehicle 1 or the like, the rear mount device 21 may be deformed and the power unit 6 may move forward.

If the power unit 6 moves forward, there is a possibility that the connection between the sliding yoke 15 of the propeller shaft 13 inserted into the propeller shaft insertion portion 12A from behind and the propeller shaft insertion portion 12A cannot be maintained.

On the other hand, according to the support structure for the power unit 6 of this embodiment, the rear mount device 21 includes the vehicle body side bracket 22 connected to the center cross member 4 and the transmission side bracket 22 connected to the rear portion of the transmission 8 . It has a bracket 23 and a vibration isolating member 25 that elastically connects the vehicle body side bracket 22 and the transmission side bracket 23 .

The transmission side bracket 23 includes first connecting portions 23A and 23B connected to the extension case 12 of the transmission 8, the vehicle body side bracket 22 connected to the vibration isolating member 25, and the first connecting portions 23A and 23B. and the second connecting portion 23C.

The second connecting portion 23C is installed at a position higher than the first connecting portions 23A and 23B, and the connecting portion 23D and the upper portion of the transmission 8 are connected by a reinforcing member 26 extending in the longitudinal direction.

As a result, the rear mount device 21 can be reinforced by the reinforcing member 26, and when an excessive load is applied to the vehicle 1 from the front, the load applied to the first connecting portions 23A and 23B can be absorbed by the transmission-side bracket 23. It can be distributed to the reinforcing member 26 .

Therefore, the deformation of the transmission-side bracket 23 is suppressed, and the connection between the first connecting portions 23A and 23B and the extension case 12 can be maintained. In addition, the reinforcement member 26 extending in the front-rear direction can prevent the transmission-side bracket 23 from collapsing in the front-rear direction.

As a result, the forward movement of the power unit 6 can be suppressed, and the connection between the sliding yoke 15 of the propeller shaft 13 and the propeller shaft insertion portion 12A can be maintained.

Further, when an excessive load is applied to the vehicle 1 from the front of the vehicle 1, as shown in FIG. Take the load so that it rotates clockwise.

According to the support structure of the power unit 6 of this embodiment, the reinforcing member 26 is connected to the connecting portion 23D at a position closer to the second connecting portion 23C than the first connecting portions 23A and 23B in the vertical direction.

As a result, when the communication portions 23D and 23E rotate clockwise about the first connection portions 23A and 23B, the second connection portions 23A and 23B are positioned apart from the first connection portions 23A and 23B in the vertical direction and the second connection portions 23D and 23E rotate clockwise. The load of the second connecting portion 23C can be received by the reinforcing member 26 connected to the connecting portion 23D at a position close to the connecting portion 23C.

Therefore, deformation of the transmission-side bracket 23 can be more effectively suppressed, and forward movement of the power unit 6 can be more effectively suppressed. As a result, the connection between the sliding yoke 15 of the propeller shaft 13 and the propeller shaft insertion portion 12A can be maintained more effectively.

Further, according to the support structure for the power unit 6 of the present embodiment, the transmission 8 includes the transmission case 10 attached to the engine 7, the extension case 12 installed behind the transmission case 10, and the transmission case 10 and the extension case. 12 and an intermediate plate 11 installed between them.

In addition, the first connecting portions 23A and 23B are connected to the extension case 12, and the reinforcing member 26 is connected to the intermediate plate 11. As shown in FIG.

The rear end of the transmission case 10 is open, and the front end of the extension case 12 is open. Therefore, the rigidity of the open end of the transmission case 10 and the open end of the extension case 12 is not high.

On the other hand, the intermediate plate 11 is formed in a disk shape and is solid except for the opening through which the input shaft and the output shaft pass. That is, it has a meat portion except for the opening. Thereby, the rigidity of the intermediate plate 11 is higher than that of the open end of the transmission case 10 and the open end of the extension case 12 which are not solid.

Since the reinforcing member 26 of this embodiment is connected to the intermediate plate 11 having high rigidity, the supporting rigidity of the reinforcing member 26 can be increased.

Therefore, deformation of the transmission-side bracket 23 can be more effectively suppressed, and forward movement of the power unit 6 can be more effectively suppressed. As a result, the connection between the sliding yoke 15 of the propeller shaft 13 and the propeller shaft insertion portion 12A can be maintained more effectively.

Also, an excessive load is applied to the vehicle 1 from the front of the vehicle 1, and as shown in FIG. When loaded to rotate, the reinforcing member 26 receives a horizontal rearward pulling force.

In the support structure of the power unit 6 of this embodiment, a guide member 27 is provided on the upper portion of the intermediate plate 11, positioned forward of the second connecting portion 23C and extending upward from the transmission 8. As shown in FIG.

A rear end portion of the reinforcing member 26 is connected to the connecting portion 23D at a position overlapping the second connecting portion 23C in the vertical direction. It extends and has a front end connected to the guide member 27 . That is, the reinforcing member 26 can be installed horizontally.

Accordingly, since the reinforcing member 26 can be installed in the same direction as the direction in which the reinforcing member 26 receives the tensile force, the tensile force can be received by the highly rigid reinforcing member 26, and deformation of the transmission-side bracket 23 can be further prevented. can be effectively suppressed.

As a result, the forward movement of the power unit 6 can be more effectively suppressed, and the connection between the sliding yoke 15 of the propeller shaft 13 and the propeller shaft insertion portion 12A can be more effectively maintained.

Further, according to the support structure for the power unit 6 of the present embodiment, a cylindrical propeller shaft insertion portion 12A into which the propeller shaft 13 is inserted is provided at the rear portion of the transmission 8, that is, at the rear portion of the extension case 12. .

First connecting portions 23A and 23B and a boss portion 28 extending in the front-rear direction are installed on the upper portion of the propeller shaft insertion portion 12A. are vertically connected by

Accordingly, the connecting portion 23D can be reinforced from the front side to the transmission case 9 by the reinforcing member 26, and the connecting portions 23D and 23E can be reinforced from the rear side by the connecting member 29.

In addition, the reinforcing member 26 can reinforce the connecting portion 23D in the horizontal direction, and the connecting member 29 can reinforce the connecting portions 23D and 23E in the vertical direction. As a result, when the connecting portions 23D and 23E receive a load such that the connecting portions 23D and 23E rotate clockwise about the first connecting portions 23A and 23B, the load can be received by the reinforcing member 26 and the connecting member 29.

In addition, since the connecting member 29 is fastened to the branched portion of the connecting portion 23D and the connecting portion 23E by the bolt 24E, the rigidity of the connecting member 29 can be increased, and the clockwise load can be more effectively absorbed by the reinforcing member 26. can accept.

Therefore, it is possible to more effectively prevent the transmission-side bracket 23 from being deformed by the reinforcing member 26 and the connecting member 29, and to more effectively suppress the forward movement of the power unit 6. As a result, the connection between the sliding yoke 15 of the propeller shaft 13 and the propeller shaft insertion portion 12A can be maintained more effectively.

Further, according to the support structure of the power unit 6 of the present embodiment, the boss portion 28 is connected to the propeller shaft insertion portion 12A, and the connecting member 29 is positioned so as to vertically overlap the first connecting portions 23A and 23B. is installed in

By connecting the boss portion 28 to the propeller shaft insertion portion 12A in this manner, the rigidity of the boss portion 28 can be increased. In addition, by arranging the connecting member 29 and the first connecting portions 23A and 23B at positions overlapping each other in the vertical direction, the load applied to the rear mount device 21 can be transferred between the connecting member 29 and the first connecting portions 23A and 23B. can be distributed to

Therefore, it is possible to more effectively prevent the transmission-side bracket 23 from being deformed by the reinforcing member 26 and the connecting member 29, and to more effectively suppress the forward movement of the power unit 6. As a result, the connection between the sliding yoke 15 of the propeller shaft 13 and the propeller shaft insertion portion 12A can be maintained more effectively.

Although embodiments of the present invention have been disclosed, it will be apparent that modifications may be made by those skilled in the art without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

1...Vehicle, 2L...Left side frame (body member), 2R...Right side frame (body member), 3A...Front upper cross member (body member), 3B...Front lower cross Member (vehicle body member), 4... Center cross member (vehicle member), 5... Rear cross member (vehicle member), 6... Vehicle power unit, 7... Engine (internal combustion engine), 7A. ..Crankshaft (output shaft), 8...Transmission, 10...Transmission case (front case), 11...Intermediate plate, 12...Extension case (rear case), 12A... Propeller shaft insertion part, 13... Propeller shaft, 14... Cross spider (propeller shaft), 15... Sliding yoke (propeller shaft), 19L, 19R... Rear wheel, 20L... Left mount device , 20R... right mount device, 21... rear mount device, 22... vehicle body side bracket, 23... transmission side bracket, 23A, 23B... first connecting portion, 23C... 2nd connection part, 23D, 23E... connection part, 25... anti-vibration member, 26... reinforcement member, 27... guide member, 28... boss part, 29... connection member

Claims (4)

An internal combustion engine having an output shaft extending in the longitudinal direction, and a transmission attached to the rear end of the internal combustion engine, wherein the front end of a propeller shaft that transmits power to rear wheels is connected to the transmission. A vehicle power unit inserted into the rear end of the
a left mount device and a right mount device for elastically supporting the internal combustion engine on a vehicle body member;
A vehicle power unit support structure including a rear mount device for elastically supporting a rear portion of the transmission to the vehicle body member,
The rear mount device elastically connects a vehicle-side bracket connected to the vehicle body member, a transmission-side bracket connected to a rear portion of the transmission, and the vehicle-side bracket and the transmission-side bracket. a vibration isolating member;
The transmission-side bracket includes a first connection portion connected to the transmission, a second connection portion connected to the vibration isolating member, and the first connection portion and the second connection portion. and a contact department for contacting
The second connecting portion is installed at a position higher than the first connecting portion,
a guide member positioned forward of the second connecting portion and extending upward from the transmission is provided in an upper portion of the transmission;
the communication portion and the upper portion of the transmission are connected by a reinforcing member extending in the longitudinal direction of the vehicle,
The reinforcing member is connected to the connecting portion at a position closer to the second connecting portion than the first connecting portion in the vertical direction,
The rear end portion of the reinforcing member is connected to the connecting portion at a position overlapping the second connecting portion in the vertical direction,
A support structure for a vehicle power unit, wherein the reinforcing member extends horizontally from the connecting portion in a side view of the vehicle, and a front end portion of the reinforcing member is connected to the guide member. The transmission includes a front case attached to the internal combustion engine, a rear case installed behind the front case, and an intermediate plate installed between the front case and the rear case. ,
2. The vehicle power unit support structure according to claim 1, wherein the first connecting portion is connected to the rear case, and the reinforcing member is connected to the intermediate plate. A cylindrical propeller shaft insertion portion into which the propeller shaft is inserted is provided at the rear of the transmission,
The first connecting portion and a boss portion extending in the longitudinal direction of the vehicle are installed above the propeller shaft insertion portion,
3. The support structure for a vehicle power unit according to claim 1 , wherein the rear portion of the connecting portion and the boss portion are vertically connected by a connecting member . The boss portion is connected to the propeller shaft insertion portion,
4. The vehicle power unit support structure according to claim 3 , wherein the connecting member is installed at a position overlapping with the first connecting portion in the vertical direction of the vehicle .

Images