JPH03109133A - Transfer supporting structure for four-wheel drive vehicle - Google Patents

Abstract

PURPOSE:To improve the supporting rigidity and noise/vibration suppressing performance by installing the front and rear side parts of a transfer which is directly connected to a differential gear and transmits the driving power of an engine to a wheel, on the engine through gussets. CONSTITUTION:Behind a transmission 9, a differential gear 12 is arranged, and a differential center Y is arranged in parallel to a transmission center Z, and interlocked with the transmission 9 through an idler 13. In the upper part of the differential gear 12, an engine 14 having a crankshaft center X is arranged behind the transmission center Z and above the differential center Y. Further, a 4WD transfer 20 is directly connected to the differential gear 20. Further, the front and rear side parts of the 4WD transfer 20 are fixed to the installation flange 29 of an oil pan 28 with a bolt 30 through the front and rear gussets 26 and 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a transfer support structure for a four-wheel drive vehicle.

BACKGROUND OF THE INVENTION In four-wheel drive vehicles, a transfer is used, for example, to distribute power from a front engine to the rear wheels.

As a support structure for this transfer, for example, No. 3.4
As shown in the figure, there is one in which the front end side part of the transfilter is fixed to the transmission 2 with a bolt 3, and the upper part of the front end is fixed to the rear wall of the cylinder block 5 of the engine 4 with a bolt 7 via a cassette 6. .

In addition, as a transfer for a four-wheel drive vehicle, for example, the Showa 61
Issued by Nissan Motor Co., Ltd. Service Bulletin No. 553 No. C2
There is one shown on page 4.

Problems to be Solved by the Invention However, in the conventional transfer support structure described above, although the transfer l is fixed to the transmission 2 and the cylinder block 5, the transfer l has a cantilever fixed structure, so that the coupling rigidity and There is room for improvement in terms of sound and vibration performance, and there is a problem in that reinforcement on the cylinder block 5 side is also required, leading to an increase in weight.

Therefore, the present invention provides a transfer support structure for a four-wheel drive vehicle that has high coupling rigidity, is advantageous in sound and vibration performance (1-), and does not require special reinforcement on the cylinder block side.

Means for Solving the Problems A four-wheel drive vehicle has a structure in which a differential center of a differential gear is arranged approximately below the crankshaft center of the engine, and is coupled in series with the differential gear to transfer the driving force of the engine to the rear wheels. The front side and the rear side of the transfer, which transmits data to the engine, are each attached to the engine via a cassette.

The front side and the rear side of the working transfer are each attached to the engine via a cassette to improve support rigidity and sound and vibration performance.

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

In FIG. 1.2, a transmission 9 is disposed on the front left side of the ladder-type subframe 8 with a transmission center Z facing in the vehicle width direction. An oil pan section IO is attached to the lower part of the transmission 9.

Note that a radiator 11 is arranged in front of the ladder-type subframe 8.

A differential gear 12 is arranged behind the transmission 9 with a differential center Y parallel to a transmission center Z, and is linked to the transmission 9 via an idler 13.

An engine 14 having a crankshaft center X behind the transmission center Z and substantially below the differential center Y is disposed above the differential gear 12.

The engine 14 is a V-shaped cylinder type (also applicable to an in-line type shown by the chain line in FIG. 2), and the engine mount 15 is mounted on the ladder-type subframe 8 with the front cylinder portion 14a tilted forward. Supported through.

A lower link 16 and a tension rod 17 are attached to both sides of the ladder-type subframe 8.

The engine 14 includes a torque converter 18 and an engine violet 4.
The torque converter 18 is located coaxially with the crankshaft center of the
and the transmission 9 are linked by a chain 19.

A 4WD transfer 20 as a transfer for transmitting the power of the engine 14 to the rear wheels is connected in series to the differential gear 12, and a propeller shaft 21 linked to the 4WD transfer 20 extends rearward at the center of the vehicle in the vehicle width direction. It's out.

Note that 22 and 23 indicate a rack gear and a pinion gear, respectively, and 24 and 25 indicate an accelerator pedal and a brake pedal, respectively.

Here, the front side part and the rear side part of the above-mentioned 4WD) transf γ 20 are each a front cassette 26. The oil pan 28 of the engine 14 via the cassette 27
The oil pan is fixed to the front and rear sides of the mounting flange 29 by bolts 30 for mounting the oil pan.

Namely, the engine! Since the differential center Y of the differential gear 12 is located approximately below the crankshaft center It becomes possible.

According to the mounting structure of the 4WD transfer 20 of the above embodiment, since the 4WD transfer 20 is located below the engine 14, the 4WD transfer 20 can be supported in a well-balanced manner by the front cassette 26 and the carrier cassette 27. .

In addition, since the front cassette 26 and the rear cassette 27 (4WD) transfer 20 are placed almost directly under the engine 14 as described above, they do not extend back and forth from the engine 14 and only have a minimum length, so the coupling rigidity is improved. As well as increasing the noise and vibration performance compared to conventional models, there is no need for any special reinforcing material on the engine +4 side.

Since the 4WD transfer 20 is located below the engine 14, the length of the engine room can be shortened and the front overhang can be reduced.

Therefore, the transmission center Z and the differential center Y are arranged in parallel, and the engine 1
This embodiment is suitable for the structure of this embodiment in which the amount of front overhang is reduced by moving the front overhang to the rear.

As described in detail, according to this invention, the front and rear parts of the transfer, which is connected in series to the differential gear and located below the engine, are supported by the engine in a well-balanced manner via the cassette. effective.

In addition, compared to the conventional system where the transfer is located behind the engine and supported in a cantilevered manner, the rigidity of the connection with the engine is higher, improving sound and vibration performance, and there is no need to reinforce the engine side, resulting in a lighter vehicle body. It also has the effect of contributing to

[Brief explanation of drawings]

FIG. 1 is an explanatory side view of an embodiment of the present invention, FIG. 2 is an explanatory plan view thereof, and FIGS. 3 and 4 are a perspective view and an explanatory side view of the prior art, respectively. 12... Differential gear, 14... Engine, 20... 4WD transfer (transfer),
26...Front gasket (cassette), 27...
Lily cassette (cassette), x...crankshaft center, Y...differential center. Figure 2

Claims (1)

[Claims] (1) The differential center of the differential gear is located approximately below the engine crankshaft center, and the differential gear is connected in series with a transfer that transmits the engine's driving force to the rear wheels. A transfer support structure for a four-wheel drive vehicle, characterized in that each of these is attached to an engine via a cassette.