JPH02200526A - Four-wheel drive car - Google Patents

Abstract

PURPOSE:To improve durability of a belt type continuously variable transmission by defining the height of a following pulley shaft of the continuously variable transmission not higher than that of a drive pulley shaft while the height of an output shaft of a reduction gear not higher than that of the following pulley shaft, so as to facilitate layout and to minimize the degree of buckling in a car. CONSTITUTION:Driving force of a vertically put engine 4 is transmitted to a belt type continuously variable transmission 8, and via a reduction gear 10, one reaches a first propeller shaft 12 for front wheel drive while the other reaches a second propeller shaft 20 for rear wheel drive. An output shaft 34 of the reduction gear 10 and the first and the second propeller shafts 12, 20 are arranged roughly in a line. The height of a following pulley shaft 30 of the continuously variable transmission 8 is defined not higher than that of a drive pulley 28, while the height of the output shaft 34 not higher than that of the following pulley shaft 30, whereby a transmission system is made compact, and layout is facilitated for the minimized degree of buckling in a car. Elevation of a torque applied to a belt 32 is prevented and the durability of the continuously variable transmission 8 can thus be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a four-wheel drive vehicle, and in particular, a belt-type continuously variable transmission and a speed reducer are connected to a longitudinally installed engine, and a belt-type continuously variable transmission is provided. It relates to four-wheel drive vehicles that utilize machines.

[Prior Art] Recently, in order to improve driving performance and stability not only when driving on rough roads or uneven terrain, but also when driving on normal roads, the driving force of the internal combustion engine has been transferred to the front drive axle. Various types of four-wheel drive vehicles have appeared in which power is transmitted to a rear drive axle to drive front wheels and rear wheels.

As such a four-wheel drive vehicle, Japanese Patent Application Laid-Open No. 60-2484
There is one disclosed in Publication No. 40. The drive torque control for a four-wheel drive vehicle disclosed in this publication includes a brake and a detection means for detecting slip on each wheel, and a signal is output to the brake based on a detection signal from the detection means to detect a wheel that is slipping. This greatly improves running ability and pitching ability.

Further, there is one disclosed in Japanese Patent Application Laid-Open No. 81-12439. The transfer case for four-wheel drive vehicles disclosed in this publication is equipped with a chain transmission device in the transfer case, and an oil guide for temporarily storing oil in the space above the chain transmission device, which corresponds to a conventional bulkhead. The transfer case has been made smaller by eliminating the
Moreover, it is lightweight, has a simple structure, and is easy to assemble.

Furthermore, there is one disclosed in Japanese Unexamined Patent Publication No. 81-207220. The locking mechanism for an automobile with a four-wheel drive device disclosed in this publication has a locking action corresponding to the rotational speed difference with respect to the other axle when one of the front and rear axles slips, and a synchronous rotation of the two axles. It is a permanent type that does not require high control moment or large capacity brakes.

[Problems to be Solved by the Invention] By the way, in a conventional four-wheel drive vehicle, as shown in FIG. a reduction gear 110 including a four-wheel drive device;
Gear or chain type transfers 142 are provided in communication with each other in sequence.

As shown in FIG. 4, the transfer 142 is connected to the first differential gear section 114 for driving the front wheels via the first propeller shaft 112 for driving the front wheels, and the second propeller shaft 120 for driving the rear wheels. and is connected to the second differential gear section 122 for driving the rear wheels.

However, as shown in FIG. 4.5, the arrangement positions and height positions of the first and second propeller shafts 112 and 120 are different.

For this reason, the area occupied by the transfer 142 and the first and second propeller shafts 112 and 120 becomes large, making layout difficult. This has the disadvantage of being disadvantageous in practical terms.

In addition, even if a belt-type gear transmission is installed instead of the transfer, the torque applied to the belt will be large because the reduction gear is located between the longitudinal engine and the belt-type continuously variable transmission. This has the disadvantage that the durability of the belt type continuously variable transmission tends to decrease.

[Purpose of the Invention] Therefore, in order to eliminate the above-mentioned disadvantages, the purpose of the present invention is to provide a continuously variable transmission by sequentially connecting a longitudinal engine mounted on a four-wheel drive vehicle, a belt-type continuously variable transmission, and a speed reducer. The height position of the driven pulley shaft of the transmission is below the height position of the drive pulley shaft, and the height position of the output shaft of the reducer is below the height position of the driven pulley shaft, making it compact. The object of the present invention is to realize a four-wheel drive vehicle in which the layout can be simplified, the amount of protrusion into the vehicle interior can be minimized, and the durability of the belt-type continuously variable transmission can be improved.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a vertical drive system in a four-wheel drive vehicle that connects a front drive axle that drives the front wheels and a rear drive axle that drives the rear wheels. A stationary engine, a belt-type continuously variable transmission, and a speed reducer are connected in sequence, and the height position of the driven pulley shaft of the continuously variable transmission is set to be below the height position of the drive pulley shaft, and the output shaft of the speed reducer is It is characterized in that the height position of the driven boob IJ shaft is configured to be equal to or lower than the height position of the driven boob IJ axis.

[Operations] With the above-mentioned configuration, the power from the vertical engine installed in the four-wheel drive vehicle is transmitted to the reduction gear via the belt-type continuously variable transmission, making the vehicle compact and easy to layout. This minimizes the amount of protrusion into the cabin and improves the durability of the belt-type continuously variable transmission.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure 1.2 shows an embodiment of the invention. 1st
In the figure, 2 is a four-wheel drive vehicle. This 4 wheel drive vehicle 2
The power transmission system transmits the driving force of the vertical engine 4 to a belt-type continuously variable transmission 8 via a transmission section 6 including a clutch and a reversing device, and from this continuously variable transmission 8 to a front and rear wheel engagement/disconnection mechanism, etc. One side reaches the front drive axle 1 propeller shaft 12 through a reduction gear 10 including a constant four-wheel drive device, and then via a first front wheel drive differential gear section 14 and a front wheel first drive axle 16. The other one that drives the front wheels 18 is
It passes through the reduction gear 10 and reaches a second propeller shaft 20 for driving the rear wheels, and drives the rear wheels 26 via the second differential gear section 22 for driving the rear wheels and the second drive axle 24 for the rear Zfi wheels.

Specifically, the drive pulley shaft 28 and the driven pulley shaft 30 of the continuously variable transmission 8 are connected by a belt 32, and the output shaft 34 of the speed reducer 10 is provided with the driven pulley shaft 30 as the input shaft side. and the driven pulley shaft 30 are connected to each other by a gear group (not shown).

Further, the output shaft 34 of the speed reducer 10 and the first and second propeller shafts 12.20 are arranged to be substantially straight as shown in FIG. 1.2.

At this time, the driven pulley shaft 30 of the continuously variable transmission 8
The height position of the output shaft 34 of the reducer 10 is set to be below the height position of the drive pulley shaft 28, for example, a height position lower by a distance a, and the height position of the output shaft 34 of the reduction gear 10 is set below the height position of the driven pulley shaft 30. For example, the configuration is such that the height position is lower by the distance.

Next, the effect will be explained.

When the vertical engine 4 is driven, the driving force from the vertical engine 4 is transmitted to the belt type continuously variable transmission 8 via the transmission section 6, and from the continuously variable transmission 8 to the reduction gear 10. reach. The transmission is transmitted by this reducer 10 to the first and second differential gear sections 14.22 via the first and second propeller shafts 12.20, respectively, and is transmitted to the front and rear wheels 18.
2 (drives 3) respectively.

As a result, the power transmission system of the four-wheel drive vehicle 2 becomes compact, the layout becomes easy, the amount of protrusion into the vehicle interior of the four-wheel drive vehicle 2 can be minimized, and the interior of the vehicle is expanded. This is advantageous in practice.

In addition, the belt type continuously variable transmission 8 disposed in the longitudinally installed engine 4 has a transfer function, and the reducer 10 is disposed on the rear side of the continuously variable transmission 8. It is possible to prevent an increase in the torque applied to the belt 32,
The pressing is economically advantageous because it can reduce the force, lengthen the service life of the continuously variable transmission 8, and improve the durability of the continuously variable transmission 8.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made.

For example, in the embodiment of the present invention, the height position of the driven pulley shaft 30 of the continuously variable transmission 8 is set a distance i! from the height position of the driving pulley shaft 28. ! ta, and the height position of the output shaft 34 of the reducer 10 is lowered by the driven pulley shaft 3.
However, as shown in FIG. 3, the height position of the driven pulley shaft 30 of the continuously variable transmission 8 is set lower than the height position of the driving pulley shaft 28. In addition to being the same, the height position of the output shaft 34 of the speed reducer 10 can also be configured to be lower than the height position of the driving pulley shaft 28 and the driven pulley shaft 30.

[Effects of the Invention] As explained in detail above, according to the present invention, the longitudinal engine mounted on a four-wheel drive vehicle, the belt-type continuously variable transmission, and the speed reducer are sequentially connected to each other, and the continuously variable transmission is Since the height position of the driven pulley shaft is set to be below the height position of the drive pulley holder, and the height position of the output shaft of the reducer is set to be below the height position of the driven pulley shaft, the above-mentioned four-wheel drive vehicle The power transmission system becomes compact, the layout becomes easy, the amount of protrusion into the interior of the four-wheel drive vehicle can be minimized, and the interior of the vehicle can be made larger, which is advantageous in practice. In addition, the belt-type continuously variable transmission installed in the longitudinally-mounted engine has a transfer function, and the reducer is installed on the rear side of the continuously variable transmission, so that the belt-type continuously variable transmission is It is possible to prevent an increase in torque, reduce the pressing force, and improve the durability of the continuously variable transmission, which is economically advantageous.

[Brief explanation of the drawing]

Fig. 1.2 shows an embodiment of the present invention, Fig. 1 is a schematic plan view of a four-wheel drive vehicle, and Fig. 2 shows the drive pulley shaft, driven pulley shaft, and output shaft of the reducer of the continuously variable transmission. FIG. 3 is a schematic enlarged side view showing the height position of FIG. FIG. 3 is a schematic enlarged side view of the height positions of a drive pulley shaft, a driven pulley shaft, and an output shaft of a speed reducer of a continuously variable transmission showing another embodiment of the present invention. Fig. 4.5 shows the prior art of the present invention, Fig. 4 is a schematic plan view of a four-wheel drive vehicle, and Fig. 5 shows the arrangement of the first propeller shaft for driving the front wheels and the second propeller shaft for driving the rear wheels. The height position is shown (schematically enlarged side view). In the figure, 2 is a four-wheel drive vehicle, 4 is a vertical engine, and 6 is a 4-wheel drive vehicle.
1 is a transmission section, 8 is a belt type continuously variable transmission, 10 is a reduction gear, 1
2 is a first propeller shaft for driving the front wheels; 14 is a first differential gear portion for driving the front wheels; 16 is a first driving axle for the front wheels; 18 is a front wheel; 20 is a second propeller shaft for driving the rear wheels; 22 24 is a second rear wheel drive axle, 26 is a rear wheel, 28 is a drive pulley shaft, and 30 is a driven pulley shaft. 32 is a belt, and 34 is an output shaft. Patent Applicant: Suzuki Motor Co., Ltd. Representative: Patent Attorney Yoshi Saigo Jitsugyo 2 Figure 3

Claims (1)

[Claims] 1. In a four-wheel drive vehicle, the front drive axle that drives the front wheels and the rear drive axle that drives the rear wheels are connected, and a longitudinal engine, a belt-type continuously variable transmission, and a speed reducer are connected in sequence. , the height position of the driven pulley shaft of the continuously variable transmission is set to be below the height position of the drive pulley shaft, and the height position of the output shaft of the reducer is set to be below the height position of the driven pulley shaft. A four-wheel drive vehicle characterized by: