JP2507239Y2 - Power transmission device for four-wheel drive vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a power transmission device for a four-wheel drive vehicle.

(Prior Art) Conventionally, in a four-wheel drive vehicle in which power transmitted from an output shaft of an engine by a transmission is transmitted to front wheels and rear wheels, the power from the engine is transferred to one wheel by a transfer or propeller. Transmission is generally performed via a shaft and a differential. For example, as seen in Japanese Patent Laid-Open No. 59-130738, the propeller shaft is installed in the front-rear direction of the vehicle. The transfer and the propeller shaft are arranged at the lower portion, and are arranged at substantially the same height as the differential on the wheel side.

(Problems to be solved by the invention) However, in the case where the transfer and the propeller shaft are installed at the same height as the differential on the wheel side and arranged in the lower part of the vehicle in the front-rear direction as described above,
This is disadvantageous in terms of effective use of vehicle interior space.

That is, like the above-mentioned propeller shaft, an exhaust system, a rear wheel steering shaft, etc. are arranged in the front-rear direction of the vehicle, and these are arranged side by side at substantially the same height in relation to the minimum ground clearance. However, a tunnel portion is widely formed in the center of the floor portion of the vehicle, which causes a problem that the foot rest of the seated person is narrowed.

Further, if there is a bent portion in the power transmission of the transfer, propeller shaft, and differential, noise will be generated depending on the bending angle.

In view of the above circumstances, the present invention has a compact arrangement for transmitting power from the engine to the differential on the wheel side via the transfer and propeller shafts while avoiding interference with the exhaust system or the rear wheel steering shaft to obtain a compact interior. It is an object of the present invention to provide a power transmission device for a four-wheel drive vehicle that makes efficient use of space and is noiseless.

(Means for Solving the Problems) In order to achieve the above object, the power transmission device of the present invention is
When the engine is placed laterally with respect to the front-rear direction of the vehicle and power is transmitted to one wheel via a transfer, a propeller shaft, and a differential, the transfer is tilted above the differential and toward the differential. The exhaust system or the rear wheel steering shaft extending in the front-rear direction of the vehicle is disposed below the propeller shaft.

(Operation) In the power transmission device for a four-wheel drive vehicle as described above, the transfer is installed above the wheel-side differential and inclined, and an exhaust system extending in the vehicle front-rear direction below a propeller shaft connecting the two. Alternatively, by arranging the rear-wheel steering shaft so as to avoid interference, the width of the tunnel that protrudes in the center of the vehicle floor is made narrower in the lateral direction to effectively use the vehicle interior space, and the seated person is seated on the seat. There is room in the foot storage area, and the transfer, the propeller shaft, and the differential are arranged in a straight line along with the inclined installation of the transfer to reduce the bending angle and avoid noise. There is.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First
FIG. 1 shows a skeleton diagram of a power transmission system of a four-wheel drive vehicle in one embodiment. The upper part of FIG. 1 is an example of the FF system in front of the vehicle.

The engine 11 is installed sideways so that the crankshaft 12 extends in the vehicle width direction. In addition, the above crankshaft 12
A transmission 18 including an input shaft 14 driven via a clutch 13, an output shaft 16 having a drive gear 15 at one end, and a speed change mechanism 17 provided between the shafts 14 and 16,
The input shaft 14 and the output shaft 16 are arranged laterally so as to extend in the vehicle width direction. The drive gear 15 provided on the output shaft 16 of the transmission 18 is the ring gear 20 in the center differential 19 (inter-axle differential mechanism).
Is engaged and power is input.

Power is distributed to the front wheel side and the rear wheel side by the center diff 19, and the front wheel side power is transmitted from the pinion carrier 25 of the center diff 19 to the front diff 30 and the left and right front wheel drive shafts 31 extending left and right from the front diff 30. The left and right front wheels 33, 34 are driven via the, 32. The rear wheel side power is transmitted from the sun gear 22 of the center differential 19 to the intermediate shaft 39 arranged in parallel with the front wheel drive shafts 31 and 32, and is transferred rearward by the bevel gears 45 and 46 of the transfer 5. It extends rearward from the output shaft 47 via the propeller shaft 48, and is input to the rear differential 49 (differential).
Left and right rear wheels 5 via the left and right rear wheel drive shafts 50 and 51
Drives 2,53.

A schematic side structure is shown in FIG.
Transmission 18 (mission casing) is located on the side of the engine (type engine), and the center differential is behind it.
A diff casing 35 in which the 19 and the front diff 30 are installed is connected, and a front wheel drive shaft 31 (32) extends laterally from the diff casing 35 and is connected to the front wheels 33 (34).
Further, the transfer 5 is installed from the rear side of the differential casing 35 to the rear side. The transfer 5 is arranged so that its center, that is, the axis of the transfer output shaft 47 is located slightly above the front wheel drive shafts 31, 32, and its output center is higher than the input center of the rear differential 49 for the rear wheels 52, 53. Has been done.

The propeller shaft 48 connected to the transfer 5 is divided into a plurality of divided rod portions 48a to 48c and connected by a joint 54. This propeller shaft
The 48 connects the transfer 5 and the rear differential 49 in a straight line so that each joint 54 does not break. Correspondingly, the transfer 5 is installed so as to incline downward from the horizontal line toward the rear differential 49 by an angle θ, and the propeller shuff shaft 48 is located on this inclined line.

Further, in the horizontal V-type engine 11, an exhaust system 60 for discharging exhaust gas from each cylinder is connected to the outside of each bank located in the front and rear. The banks are arranged independently on both sides, each exhaust manifold 61 is guided rearward and connected to the exhaust gas purification device 62, and each exhaust pipe 63 is formed so as to extend rearward of the vehicle body and discharge to the atmosphere. The exhaust system 60 is arranged below the propeller shaft 48.

Further, the intermediate portion of the propeller shaft 48 is supported on the vehicle body side by the main bearing 55,
As shown in FIG. 3, the structure of this portion is a substantially central portion in the width direction of the vehicle, and the floor panel 56 of the vehicle body is provided with a predetermined width so that the central portion is raised in two steps so that the tunnel portion is formed upward. 56a
Are formed. Mount members 57 are fixed to the flat portions on both sides of the intermediate portion of the tunnel portion 56a.
The propeller shaft 48 is supported on the upper surface of 57 by a mounting member 58 via a main bearing 55, and is arranged in the front-rear direction of the vehicle. A seat mount 59 is installed on the side of the propeller shaft 48, a seat (not shown) is disposed, and the upper portion of the tunnel portion 56a is located between the seats.

On the other hand, in the space below the propeller shaft 48 below the tunnel portion 56a, two exhaust pipes 63, 63 of an exhaust system 60 connected to each bank of the engine 11 are arranged so as to extend in the front-rear direction. ing. Further, in a vehicle provided with a four-wheel steering mechanism in which the rear wheels are steered in response to front wheel steering in the space below the tunnel portion 56a, the shaft 64 for rear wheel steering has the exhaust pipe 63 side. It is arranged so as to extend in the front-rear direction.

According to the structure of the above-described embodiment, the propeller shaft 48, the exhaust system 60, and the rear wheel steering shaft 64, which are arranged in the front-rear direction at the center bottom portion of the vehicle, are not arranged side by side in the lateral direction, Also, by disposing the exhaust pipe 63 and the rear wheel steering shaft 64 below the propeller shaft 48 by arranging it above the propeller shaft 48, the propeller shaft 48 mount portion structure can be downsized, and the width of the tunnel portion 56a can be narrowed to seat the seat. It is designed to secure a foot space for people. In the above structure, the central portion of the tunnel portion 56a is high, but the narrower the width, the more effective it can be used.

Further, the inclined arrangement of the transfer 5 and the propeller shaft 48 makes it possible to suppress the generation of noise from the joints because the bending angle of each joint is small.

It should be noted that in the above embodiment, an example was described in which two exhaust pipes were installed side by side in a V-type engine, and a rear wheel steering shaft was also installed, but these are adopted as necessary, In particular, the effect of the present invention is remarkable in a vehicle that is often arranged in the front-rear direction.

(Effects of the Invention) According to the present invention as described above, in transmitting power from the engine to one wheel through the transfer, the propeller shaft, and the differential, the transfer is performed above the differential and toward the differential. Since the exhaust system or the rear-wheel steering shaft extending in the vehicle front-rear direction is arranged below the propeller shaft, the propeller shaft may interfere with the exhaust system or the rear-wheel steering shaft. It can be placed compactly, and the shape of the tunnel that protrudes in the center of the vehicle floor is made narrower in the lateral direction to effectively use the interior space of the vehicle, allowing more space for seating seated feet. In addition, the bending angle of the propeller shaft can be reduced to suppress the generation of noise.

[Brief description of drawings]

FIG. 1 is a skeleton view showing a power transmission device for a four-wheel drive vehicle according to an embodiment of the present invention, FIG. 2 is a schematic side view of the power transmission device, and FIG. 3 is a line III-III in FIG. It is sectional drawing which shows the specific structural example of the cross section along. 5 ... Transfer, 11 ... Engine, 19 ... Center differential, 30 ... Front differential, 31, 32 ... Front wheel drive shaft, 33,
34 …… front wheel, 47 …… transfer output shaft, 48 …… propeller shaft, 49 …… rear differential (differential), 5
0,51 …… Rear wheel drive shaft, 52,53 …… Rear wheel, 54 …… Joint, 56 …… Floor panel, 56a …… Tunnel part, 60 …… Exhaust system, 63 …… Exhaust pipe, 64 …… Rear wheel steering shaft.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichiro Shimada 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (56) References JP-B-63-32648 (JP, B2)

Claims (1)

(57) [Scope of utility model registration request] 1. A four-wheel drive vehicle in which an engine is arranged laterally with respect to the front-rear direction of a vehicle and power is transmitted to one wheel via a transfer, a propeller shaft, and a differential, and the transfer is provided with the differential. A four-wheel drive vehicle characterized in that the exhaust system or the rear-wheel steering shaft extending in the front-rear direction of the vehicle is arranged above the propeller shaft and inclined toward the differential. Power transmission device.