JPS5981229A - Four-wheel-drive vehicle - Google Patents

Abstract

PURPOSE:To enlarge the engine room space by providing a pair of bevel gears at the output of transmission and at the input of front def of a four-wheel-drive vehicle having a lateral engine while integrating one of each bevel gears with the transmission shaft for driving rear wheel. CONSTITUTION:Driving force of engine is inputted through a clutch 5 to the input shaft 6 of transmission 3 where it is speed changed properly to rotate the intermediate shaft 24 through gearing between the drive gear 19 of output shaft 8 and the transmission gear 22 and to rotate the transmission shaft 27 through the bevel gears 23, 28. Driving force of transmission shaft 27 is transmitted through gearing of bevel gear 29 of transmission shaft 25 and casing 30 of front def 7 to the short shaft 44 of casing 30 then distributed to the left and right by bevel gears 32, 33 and 34, 35 thus to drive the front wheels. At the same time, if 2-4 exchange sleeve 48 is at the four-wheel-drive position, driving force of transmission shaft 27 is transmitted through sleeve 48, transmission shaft 26, propeller shaft and rear def to drive the rear wheels.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheel drive vehicle equipped with a so-called horizontal engine whose crankshaft extends in the left-right direction of the vehicle body.

Generally, in a wheel drive vehicle, the engine is arranged so that its crankshaft extends in the longitudinal direction of the vehicle, the transmission is arranged so that its input shaft and output shaft extend in the longitudinal direction of the vehicle, and a transfer is added to the transmission. As a result, the driving force of the engine is divided into two by the propeller shaft for the front wheels and the propeller shaft for the rear wheels.
It is known that the power is divided and transmitted to a front differential and a rear differential to drive the front, rear, left and right wheels.

However, 7-wheel drive vehicles with vertical engines have the problem of not being able to provide a large cabin space, so in recent years, 7-wheel drive vehicles with horizontal engines that do not have this problem have been developed. Several cars are proposed.

For example, a center differential consisting of a group of planetary gears is arranged coaxially with a front differential, and 1) the output from the transmission is received by the pinion carrier of the center differential, and seven pairs of bevel gears for driving the rear wheels are connected to the ring gear or sun gear of the center differential. (Japanese Patent Application Laid-Open No. 1986-6t-/3; 73)
．． 22), ii) A system in which the output from the transmission is received by the ring gear of the center differential and outputted from the pinion carrier of the center differential to one of a pair of bevel gears for rear wheel drive (JP-A-67-G/, 2/ (See item 1).

However, with such a structure, the position of the front differential, especially the position in the longitudinal direction, is subject to restrictions, and a considerable amount of space is required for the front differential and center differential, resulting in the problem that the engine room space becomes small. There is.

The present invention has been made in view of the above, and includes a pair of bevel gears provided on the output side of the transmission and on the input side of the front differential, and one bevel gear of each bevel gear transmits driving force to the rear wheel drive shaft. By providing the front differential integrally with the transmission shaft, there is greater freedom in selecting the placement of the front differential in the longitudinal direction of the vehicle body, and the main parts such as the front differential can be placed within the tunnel, thereby expanding the engine room space. The object is to provide a wheel drive vehicle where possible.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to embodiments with reference to the drawings.

<Embodiment/> In FIGS. 1 and 2, reference numeral 1 denotes a Y-cylinder engine, and the crankshaft 2 is arranged at the front of the vehicle body so as to extend in the left-right direction of the vehicle body. 6 is a transmission, which is disposed within the casing 4 and which includes a clutch means 5;
An input shaft 6, to which the crankshaft 2 is connected via, and an output shaft 8, which is linked to a front differential 7, are arranged in the left-right direction of the vehicle body.

A first continuous gear 9, a reverse gear 10, a second speed gear 11, a third speed gear 12, and a second speed gear 11 are fixedly installed on the input shaft B in this order from the clutch means 5 side. There is.

On the other hand, the output shaft 8 has the respective gears 9, 10, 11, 12.
．． - Gears 14, 15, 16, 17, 18 and drive gear 19 that mesh with gear 13 are fixedly installed, and gears 14 and 1
5. Synchronizing mechanisms 20 and 21 are disposed between gears 17 and 18, respectively.

A transmission gear 22 meshes with the drive gear 19, and the transmission gear 22 has an intermediate shaft 24 integrally formed with a bevel gear 23.
It is fixed in place. The bevel gear 23 of this intermediate shaft 24 is connected to a transmission shaft 27 consisting of first and second transmission shafts 25 and 26.
Another bevel gear 29 is integrally formed with the first transmission shaft 25 and meshes with a bevel gear 28 fixed to the tip of the first transmission shaft 25 . Further, a bevel gear 31 fixedly installed outside the casing 30 of the front differential 7 meshes with this other bevel gear 29.

Inside the casing 30 of the front differential 7, a pair of bevel gears 32.3 are arranged opposite to each other by a short axis 44 in the longitudinal direction of the vehicle body.
3 and another pair of bevel gears 34 and 35 disposed opposite to each other on the left and right so as to mesh with the pair of bevel gears 32 and 3.

The ends of the linkage mechanism of the left and right/paired bevel gears 34.35 are connected to a front wheel drive shaft 38.3 via a join 36.37.
One end of the front wheel drive shaft 38, 39 is connected to the left and right front wheels 4 via another joint) 40, 41.
2.43.

A second power transmission shaft 26 whose rear end is connected to a propeller shaft 46 through a joint 45 is rotatably connected to the rear end of the first power transmission shaft 25 through a bearing 47 . Furthermore, a two-gage switching sleeve 48 is movably engaged (for example, spline-fitted) in the connecting portion of both the transmission shafts 25 and 26 in the axial direction. This 2-gage switching sleeve 48 has a two-wheel drive position in which it engages only with the first transmission shaft 25 (or second transmission shaft 26), and a two-wheel drive position in which it engages only with the first transmission shaft 25 (or second transmission shaft 26), and a two-wheel drive position in which it engages only with the first transmission shaft 25 (or second transmission shaft 26), and
and a wheel drive position where the transmission shafts 25 and 26 are engaged to connect the two transmission shafts 25 and 26, by operating means (not shown). In addition, in the two-wheel drive position, the connection between the lever □Yadev 49 and the rear rain wheel 50.51 is released, and the member between the two-gage switching sleeve 48 and the rear rain wheel 50.51 does not move. There is.

A bevel gear 52 of a rear differential 49 is connected to the rear end of the propeller shaft 46 via a joint 51. A large bevel gear 55 supporting a pair of bevel gears 53 and 54 meshes with this bevel gear 52, and another pair of bevel gears 56 and 57 on the left and right sides mesh with the bevel gears 53 and 54. They are placed opposite each other.

Also - left and right bevel gears 56.57 have joints 5.8
,．． One end of the rear wheel drive shaft 60, 61 is connected via the rear wheel drive shaft 60, 61, and joined to the other end of the rear wheel drive shaft 60, 61) 62
, /) 3, the left and right rear wheels 50, 51 are connected to each other.

With the above configuration, the driving force output from the engine 1 is inputted to the input shaft B of the transmission B via the clutch means 5, and the gears are changed as appropriate to the drive gear 19 of the output shaft 8 and the transmission gear 22. Due to the meshing of the intermediate shaft 24
is rotationally driven, and the transmission shaft 27 is rotationally driven by the meshing of the pair of bevel gears 26 and 28.

The rotational driving force of the transmission shaft 27 is generated by the bevel gear 29 of the first transmission shaft 25 and the bevel gear 29 of the casing 30 of the front differential 7.
The transmission is transmitted to the short shaft 44 in the casing 30 by meshing with the pair of bevel gears 32, which is supported by the short shaft 44.
．． 33 and another/pair of bevel gears 54.35 meshing with these, the left and right front wheels 42.
43 is driven.

At the same time, when the 2-g switching sleeve 48 is in the 2-g wheel drive position, the rotational driving force of the transmission shaft 27 (first transmission shaft 25) is transferred to the jl' switching sleeve IJ-b 48, the second transmission shaft 26, it is transmitted to the propeller shaft 46, and then distributed to the left and right at the rear differential 49, and is transmitted to the left and right rear wheels 5.
Drive 0.51.

<Example 2> This example is a case where the transmission is equipped with an auxiliary transmission.

In FIG. 3, the bevel gear at the end of the transmission shaft (first transmission shaft) meshes with a bevel gear 83 formed integrally with a shaft 82 constituting an auxiliary transmission 81, and the shaft 82 is connected to the gear. A low speed gear 84 and a high speed gear 85 are fitted and fixed in order from the 86 side, and a synchronization mechanism 86 is interposed between the two gears 84 and 85.

A gear 87 meshing with the low speed gear 84 and high speed gear 85
．． 88 is integrally formed on the output shaft 8 of the transmission B.

As a result, in the two stages of high speed and low speed on the auxiliary transmission side, the main transmission side is shifted in the stages of 7th gear, 2nd gear, 3rd gear, and 3rd gear, so overall is a male
The speed will be changed in stages. 1 Note that other components are the same as in Example/, so
The same reference numerals are used for the same components, and detailed description thereof will be omitted.

Further, in the above embodiment, the case where the engine 1 is disposed at the front of the vehicle body has been described, but it goes without saying that the present invention can also be applied to a case where the engine is disposed at the rear of the vehicle body.

Since the present invention is configured as described above, the degree of freedom in selecting the arrangement of the front differential in the longitudinal direction of the vehicle body is increased, and the arrangement with good handling stability can be selected, and the main parts such as the front differential can be selected. It can be placed inside a so-called tunnel section, making it possible to expand the engine room space.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a diagram schematically showing the drive system of the embodiment in a skeleton form, and FIG. 2 specifically shows the main parts of the embodiment. FIG. 3 is a diagram similar to FIG. 2 of the second embodiment.

Claims (1)

[Claims] (1) An engine arranged so that the crankshaft extends in the left-right direction of the vehicle body, a transmission in which an input shaft and an output shaft having a drive gear are arranged in the left-right direction of the vehicle body, and a front differential whose input gear is a bevel gear. The driving gear is a bevel gear, and the driving gear is a bevel gear, and the bevel gear meshes with the bevel gear, respectively.
A wheel drive vehicle characterized in that a pair of bevel gears are integrally provided on a transmission shaft that transmits driving force to a rear wheel drive shaft.