JPH01186430A - Four-wheel drive vehicle - Google Patents

Abstract

PURPOSE:To enable longitudinal arrangement of power plant, where respective components are set similarly to those in power plant at front side, as a power plant of midship system four-wheel drive vehicle with conventional front and rear differentials being utilized as it is. CONSTITUTION:Front and rear axles 2, 3 and front and rear differentials 4, 5 are arranged on the body 1 of a four-wheel drive vehicle. A power plant 6 comprising an engine 7, a transmission 8 and a differential mechanism 9 is mounted on the body 1. Components 7-9 of the power plant 6 are arranged similarly to those in front side power plant. The power plant 6 is arranged longitudinally in front of the rear axle 3 in order to achieve a midship system, while the engine 7 and the transmission 8 are arranged in front and rear of the body 1. The differential 9 is coupled, as a central differential, with front and rear differentials 4, 5 through a speed incremental reverse mechanism.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a four-wheel drive vehicle.

(Prior Art) In a vehicle, generally, as shown in Japanese Utility Model Application Publication No. 56-44927, a power plant including an engine, a transmission, and a differential mechanism is placed horizontally or vertically on the front side.
Based on this configuration, the direction of rotation of the drive axle is determined as desired.

Incidentally, recently, in vehicles, in order to produce large-cap production effects, the common use of component parts has been promoted, and from this point of view, the power plant placed on the front side is used as the power plant of a mid-ship four-wheel drive vehicle. There is a request for a vertical arrangement closer to the front of the vehicle body than the axle.

(Problem to be Solved by the Invention) However, when attempting to vertically arrange the above-mentioned front-side power plant as a power plant for a four-wheel drive vehicle in a midship system, in front of the rear axle, , the vertical relationship between the engine and transmission cannot be changed, and in order to increase the interior space, the engine, which is larger than the transmission, must be placed at the rear of the vehicle body than the transmission. In such an arrangement, the direction of rotation of the drive axle would be the opposite of that in the front arrangement, making it impossible to use the front-end power plant as a power plant in a midship system.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to make the arrangement of the engine, transmission, and differential mechanism the same as that of the front-side power plant, and to provide a four-wheel power plant in a midship system. The purpose is to enable vertical installation as a power plant for a driving vehicle.

(Means and operations for solving the problem) In order to achieve the above object, the present invention provides a power plant in which the arrangement of the engine, transmission, and differential mechanism is the same as that of the front-side power plant. The plant is arranged such that the engine and transmission of the power plant are disposed in the longitudinal direction of the vehicle body, and the engine is disposed toward the rear of the vehicle body relative to the transmission, and the differential mechanism serves as a center differential for increasing speed and reversing. This is a four-wheel drive vehicle characterized by being linked to a differential between the wheels via a mechanism.

With the above configuration, the speed increasing/reversing mechanism corrects the direction of rotation input to the inter-wheel differential, and compensates for the deceleration caused by the differential mechanism of the power unit and the inter-wheel differential. For this reason, even if the power plant has the same arrangement of the engine, transmission, and differential mechanism as the front-side power plant, it is possible to use the conventional front differential and rear differential as is, and with as little modification as possible, the midship system can be used. This means that it can be placed vertically as a power unit for a four-wheel drive vehicle.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 to 3, 1 is a four-wheel drive vehicle, and a front axle 2 and a rear axle 3 are disposed at the front and rear of this vehicle 1, respectively. A front differential 4 is disposed on the front axle 2, and a rear differential 5 is disposed on the rear axle 3. The front differential 4 and the rear differential 5 are conventionally known ones.

This vehicle 1 is equipped with a power plant 6 . In this embodiment, this power plant 6 has the following features:
As shown in FIGS. 1 and 2, the power plant 6 includes an engine 7, a transmission 8, and a differential mechanism 9, and the components 7 to 9 of the power plant 6 are arranged horizontally on the front side. It has the same configuration as the power plant in the layout. This power plant 6 is vertically arranged on the rear side of the vehicle in front of the rear axle 3 in order to adopt a mid-ship system, and therefore the engine 7 and transmission 8 can be installed in the longitudinal direction of the vehicle. be.

To explain the components 7 to 9 in the power plant 6, the engine 7 is located at the rear of the vehicle body relative to the transmission 8, which allows the interior space to be as wide as possible. ing. Shift 4! ! 8 is arranged in front of the vehicle body than the engine 7 via a clutch lO, and the power of the engine 7 is transmitted to the transmission 8 via the clutch 10. The power transmitted to the transmission 8 is transferred to the gear mechanism 11.
The rotational force is transmitted as a rotational force to the output shaft 12 via the output shaft 12, and the rotational force is outputted from the output gear 13. The differential mechanism 9 is disposed on the inner side in the width direction than the transmission 8 and is used as a center differential, and the output from the output gear 13 of the transmission 8 is input to the differential mechanism 9 in a meshing relationship. It is supposed to be. As shown in FIG. 2, this differential mechanism 9 is constructed as a differential equipped with a limited slip differential by combining a known bevel gear 14 and a viscous coupling 15.

The power input to the differential mechanism 9 is transmitted to these components 14.
15, a pair of output shafts 16a extending in the longitudinal direction of the vehicle body;
16b. The direction of rotation of this pair of output shafts 16a, 16b is the same as the direction of rotation of the output shaft 12 of the transmission 8, as shown in the arrow in FIG. As shown, the relationship is the opposite.

A speed increasing/reversing mechanism 17 is provided between the differential mechanism 9 and the front differential 5, and between the differential mechanism 9 and the front differential 4. Since both speed increasing/reversing mechanisms 17 have the same configuration, only the speed increasing/reversing mechanism 17 provided between the differential mechanism 9 and the rear differential 5 will be described. The speed increasing/reversing mechanism 17 includes a ring gear 18, a plurality of planet gears 19, a differential carrier 20, and a sun gear 2.
It is roughly composed of 1. The ring gear 18 is connected to the output shaft 16b of the differential mechanism 9 via a transmission shaft 22, and the output from the differential mechanism 9 is input to the ring gear 18. Multiple planet gears 1
9 meshes with the internal teeth of the ring gear 18. The differential carrier 20 carries a plurality of planet gears 19, and the differential arrangement carrier 20 is fixed to the TEF case 5a of the rear differential 5. sun gear 2
1 includes the plurality of planet gears 1 on the outer peripheral side thereof.
9 is engaged. The sun gear 21 has a drive shaft 23
are fitted at one end so that they cannot rotate relative to each other,
A drive pinion 24 is attached to the other end. This drive pinion 24 meshes with the ring gear 5b as an input gear of the rear differential 5, and the output from the speed increasing/reversing mechanism 17 is input to the rear differential 5. In addition, 25 is an end cover.

Therefore, according to the above configuration, as a result of vertically arranging the L power plant 6 as described above, when performing forward operation, the rotation direction of the output shafts 16a, 16b and the transmission shaft 22 of the differential mechanism 9 is As shown in FIG. 2, the relationship is opposite to that when the power plant 6 is disposed horizontally on the front side.

However, the speed increasing/reversing mechanism 17 reverses the rotational direction of the input from the transmission shaft 322 and outputs from the drive shaft 23, so that the rear differential 5 and the front differential 4 are rotated normally during forward driving. Power will be input in this direction. As a result, the rotational directions of the rear axle 3 and the redrive axle of the front axle 2 become the desired directions for forward movement.

Moreover, the speed increasing/reversing mechanism 17 compensates for the deceleration caused by the differential mechanism 9, front differential 4, and rear differential 5, and the front axle 2 and rear axle 3 are driven at the normal rotational speed. It turns out.

For this reason, even if the power plant 6 has the same arrangement of the engine 7, transmission 8, and differential mechanism 9 as that of the front transverse power plant, the conventional front differential 4
, by using the rear differential 5 as is and with as few modifications as possible, the power plant 6 of a mid-ship four-wheel drive vehicle was created.
This means that it can be placed vertically.

(Effects of the Invention) As described above, even if the present invention is a power plant in which the arrangement of the engine, transmission, and differential mechanism is the same as that of a front-side power plant, the conventional front differential and rear differential It can be used as is and installed vertically as a power unit for a four-wheel drive vehicle in a midship system with as little modification as possible.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing the arrangement of a power unit according to the present invention, FIG. 2 is an explanatory diagram illustrating the power unit according to the present invention, and FIG. 3 is a longitudinal sectional view showing a speed increasing/reversing mechanism and a rear differential. l: 4-wheel drive vehicle 4: Front differential 5: Rear differential 6: Power plant 7: Engine 8: Transmission 9: Differential mechanism 17: Speed increasing reversal mechanism

Claims (1)

[Claims] (1) A power plant in which the arrangement of the engine, transmission, and differential mechanism is the same as that of a front-side power plant, and the arrangement direction of the engine and transmission of the power plant is in the longitudinal direction of the vehicle body. A four-wheel drive vehicle, wherein the engine is disposed toward the rear of the vehicle body than the transmission, and the differential mechanism is linked as a center differential to an inter-wheel differential via a speed increasing/reversing mechanism.