JPH0710929Y2 - 4-wheel drive system for automobiles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) This invention is, for example, a first differential device with one front wheel and a second differential device.
The present invention relates to a four-wheel drive system for an automobile, in which a differential gearbox is driven and a second differential gearbox drives the other front-wheel and rear-wheel differential gear to reduce the size of the differential gearbox. .

(Prior Art) Conventionally, as a four-wheel drive system for an automobile of the above-mentioned example, there is, for example, a system described in JP-A-59-1841.

That is, a bevel gear type first differential device in which an input portion (ring gear) is connected to an output gear of a transmission and one output portion (second side gear) of the first differential device via a semi-shaft. A bevel gear-type second differential gear to which an input portion (pinion shaft) is connected, and the first differential gear and the second differential gear described above are provided in proximity to the front wheel pair at the front of the vehicle body and have their axes A left wheel of the front wheel pair is coaxially arranged on an axis line parallel to the first differential device, and the left wheel of the front wheel pair is located on the right wheel side of the second differential device. The right wheel of the front wheel pair with one side gear
A four-wheel drive system for an automobile configured to drive a pair of rear wheels of a rear part of a vehicle body via a ring gear or the like by a second side gear located on the first differential device side of the differential device.

In this four-wheel drive system, the first differential device drives the left front wheel and the second differential device, and the second differential device drives the right front wheel and the rear differential, so that the differential transmission device is simple and compact. On the other hand, while the second differential device receives the power output from the first differential device through the semi-shaft through the orthogonal shaft as the pinion shaft, There was a problem with the deterioration of the durability of the moving device.

(Object of the Invention) An object of the present invention is to provide a four-wheel drive system for an automobile capable of ensuring the durability of the differential while simplifying the structure of the differential transmission.

(Structure of the Invention) The present invention is directed to a first differential device in which an input portion is connected to an output gear of a transmission, and a bevel gear type in which an input portion is connected to one output portion of the first differential device. A second differential device, wherein both the differential devices are coaxially arranged on an axis parallel to the first wheel pair in the front part of the vehicle body or the rear part of the vehicle body in parallel with the first wheel pair. At the other output part, one wheel of the first wheel pair, at the first side gear of the second differential gear, the other wheel of the first wheel pair, and at the second side gear of the second differential gear, the front part of the vehicle body. Alternatively, in a four-wheel drive system for an automobile which respectively drives the other second wheel pair at the rear part, the input part of the second differential device accommodates the first and second side gears and the pinion gear meshing with them, and the pinion gear is And a shaft portion formed at an end portion of the case member supporting the first differential device, The first side gear is a side gear arranged on the first differential device side of the two side gears of the second differential device, and a ring gear for driving the second wheel pair is rotatable with respect to the case member. Is a four-wheel drive system for an automobile connected to the second side gear.

(Effect of the Invention) According to the present invention, one wheel of the first wheel pair and the second differential apparatus are driven by the first differential apparatus described above, and the first wheel pair is driven by the second differential apparatus described above. Since the other wheel and the second wheel pair are driven, the structure of the differential transmission can be simplified.

Moreover, since the power output from one output portion of the first differential device is input to the case member of the second differential device, the power is transmitted from this case member to the pinion gear through the pinion shaft. There is an effect that the durability of the first differential device can be secured.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

The drawings show a four-wheel drive system for an automobile. In FIGS. 1 and 2, an engine 1 and a transmission 2 are connected,
Both of these 1 and 2 are horizontally arranged, and the four-wheel drive system includes a first differential device 4 arranged in a transmission case 3 and a second differential device 6 arranged in a transfer housing 5. , A rear differential 8 disposed in the rear differential carrier 7.

The first differential device 4 and the second differential device 6 described above are coaxially arranged on an axis parallel to the first wheel pair consisting of the left and right front wheels 9 and 10 in the front part of the vehicle body, on the other hand. Rear differential 8
Is arranged close to the second wheel pair consisting of the left and right rear wheels 11, 12 on the rear part of the vehicle body and on an axis parallel to the axis.

Further, the first differential device 4 described above is a planetary gear type differential device, and the first differential device 4 is a front drive shaft.
Sanga 15 splined to 13 spline part 14
, A planetary gear pinion 18 that is loosely fitted to the pinion shaft 17 of the planetary carrier 16 and meshes with the above-mentioned sun gear 15, and a plurality of planetary gear pinions 18 ...
An internal gear 19 that meshes with the planetary carrier 16 and a large-diameter planetary ring 20 integrally formed on the outer peripheral portion of the planetary carrier 16 are provided.

The output gear 21 of the transmission 2 is meshed with the planetary ring gear 20 of the first differential gear 4, while the internal gear 19 is integrally formed with the cylindrical shaft portion 22 extending toward the second differential gear 6 side. Then, the cylindrical shaft portion 22 is spline-fitted to the left end spline portion 24 of the intermediate shaft 23 serving as an intermediate shaft.

That is, the internal shaft 19 as one output portion of the first differential device 4 described above is used as the intermediate shaft.
The second differential device 6 is driven via 23, and the left front wheel 9 is driven via the front drive shaft 13, the constant velocity joint 25, the front axle shaft 26, and the constant velocity joint 27 by the sun gear 15 as the other output portion. Configured to do so.

On the other hand, the above-mentioned second differential device 6 is a bevel gear type differential device,
The second differential device 6 is a differential case as a case member.
28, the pinion gears 30 and 30 housed in the differential case 28 and loosely fitted to the pinion shafts 29 and 29 of the case 28, and the first side gears 3 that mesh with the pinion gears 30 and 30.
The first and second side gears 32 and the ring gear 33 rotatably provided with respect to the differential case 28 for driving the left and right rear wheels 11, 12 are provided, and the first difference between the two side gears 31, 32 is provided. Firstly, the side gear 31 arranged on the moving device 4 side
It is set to side gear.

Then, while the second side gear 32 of the second differential device 6 is loosely fitted to the front drive shaft 34, the first side gear 31 is spline fitted to the spline portion 35 of the front drive shaft 34 to 1 side gear 31
In the front drive shaft 34, constant velocity joint
The right front wheel 10 is configured to be driven through the 36, the front axle shaft 37, and the constant velocity joint 38.

In addition, a member 40 spline-fitted to the outer peripheral spline portion 39 of the second side gear 32 is provided, and the member 40 is bolted up to the ring gear 33, so that the second side gear 32 has the member 40, The ring gear 33, the drive pinion gear 41, the drive pinion shaft 42, the propeller shaft 43, and the rear differential 8 are used to drive the second pair of left and right wheels 11 and 12.

By the way, the differential case 28 in the second differential device 6 described above.
Is attached to the end of the case 28 on the side of the first differential 4 and the cylindrical shaft 28
a is integrally formed, and this cylindrical shaft portion 28a is set as the input portion of the second differential device 6.

That is, the cylinder shaft portion 28a is spline-fitted to the right end spline portion 44 of the intermediate shaft 23 described above, and the power output from the internal gear 19 as one output portion of the first differential device 4 is set as described above. It is configured to be input to the second differential device 6 via the intermediate shaft 23, the cylinder shaft portion 28a, and the differential case 28.

On the other hand, the drive pinion gear 41 that meshes with the ring gear 33 described above is integrally formed with a drive pinion shaft 42, and the drive pinion shaft 42 is provided with a universal joint 45, a propeller shaft 43, and a universal joint 46 on the rear side drive pinion shaft. 47 are connected.

Then, the drive pinion gear 48 integrally formed on the drive pinion shaft 47 is attached to the ring gear 49 of the rear differential 8.
The rear differential case 50 is provided with pinion gears 52 and 53 which are loosely fitted to the rear differential case via the pinion shaft 51, and two side gears 54 and 55 which mesh with these pinion gears 52 and 53. The left rear wheel 11 is driven via the joint 57, the rear axle shaft 58, and the joint 59.

Also, on the right side gear 55, the rear drive shaft 60,
Joint 61, rear axle shaft 62, joint 63
It is configured to drive the right rear wheel 12 via.

Here, the above left front wheel 9, right front wheel 10, left rear wheel 11, right rear wheel
The respective power transmission systems for the 12 four wheels are schematically shown as follows.

Power transmission system to left front wheel 9 21 → 4 → 18 → 15 → 13 → 25 → 26 → 27 → left front wheel 9 Power transmission system to right front wheel 10 21 → 4 → 18 → 19 → 23 → 28a → 28 → 6 → 31 → 34 → right front wheel 10 power transmission system to left rear wheel 11 21 → 4 → 23 → 6 → 32 → 33 → 41 → 43 → 8 → 54 → 56 → left rear wheel
11 Power transmission system to the right rear wheel 12 21 → 4 → 23 → 6 → 32 → 33 → 41 → 43 → 8 → 55 → 60 → right rear wheel
12 In addition, torque distribution is selected from the values in the upper row or the lower row in the following table.

In this embodiment, since the equally distributed diff is used as the above-mentioned second differential device 6, the torque distribution has the values shown in the lower row of the above table, but instead of the equally distributed diff, the unequal distributed second differential device. May be selected for the torque distribution in the upper stage of the above table.

In the above-described four-wheel drive system configured as described above, the first differential device 4 drives one wheel of the front wheel pair (the left front wheel 9) and the second differential device 6, and the second differential device 6 is driven. Since the other wheel of the front wheel pair (the right front wheel 10) and the rear wheel pair are driven by, the simplification of the structure of the differential transmission, in particular, the cylinder shaft structure can be achieved.

Moreover, unlike the conventional four-wheel drive system, the power output from one output portion (internal gear 19) of the first differential device 4 described above is transmitted to the differential case 28 as a case member of the second differential device 6. Since the power is transmitted from the differential case 28 to the pinion gears 30 and 30 via the pinion shafts 29 and 29 after the input, the durability of the first differential device 4 can be ensured.

In the correspondence between the configuration of the present invention and the above-described embodiment, the transmission of the present invention corresponds to the transmission 2 of the embodiment, and similarly, the output gear of the transmission corresponds to the output gear 21, The input part of the first differential device corresponds to the planetary ring gear 20, one output part of the first differential device corresponds to the internal gear 19, and the other output part of the first differential device is Corresponding to the sun gear 15, the input portion (shaft portion) of the second differential device corresponds to the cylindrical shaft portion 28a, the case member of the second differential device corresponds to the differential case 28, and the first wheel pair is The second wheel pair corresponds to a rear wheel pair including a left front wheel 9 and a right front wheel 10, and the second wheel pair corresponds to a rear wheel pair including a left rear wheel 11 and a right rear wheel 12. It is not limited to the configuration of the embodiment.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a system diagram showing a power transmission system of a four-wheel drive system for automobiles, and FIG. 2 is a sectional view showing a concrete structure of a main part of FIG. . 2 ... Transmission 4 ... 1st differential gear, 6 ... 2nd differential gear 9 ... Left front wheel, 10 ... Right front wheel 11 ... Left rear wheel, 12 ... Right rear wheel 15 ... Sunga 19 ... Internal gear 20 ... Planetary ring Gear 21 ... Output gear 28 ... Differential case 28a ... Cylindrical shaft part, 30 ... Pinion gear 31 ... First side gear, 32 ... Second side gear 33 ... Ring gear

Claims (1)

[Scope of utility model registration request] 1. A first differential gear having an input portion connected to an output gear of a transmission, and a bevel gear type second differential gear having an input portion connected to one output portion of the first differential gear. And a device for arranging the both differential devices coaxially on an axis parallel to the first wheel pair in the front part or the rear part of the vehicle body, the output part being the other output part of the first differential device. And one wheel of the first wheel pair, the first side gear of the second differential gear set to the other wheel of the first wheel pair, and the second side gear of the second differential gear set to the other of the front and rear parts of the vehicle body. In a four-wheel drive system for an automobile that respectively drives the second pair of wheels, a case in which the input portion of the second differential device accommodates the first and second side gears and a pinion gear meshing with them, and pivotally supports the pinion gear The shaft portion formed at the end of the first differential device side of the member, The dog gear is a side gear arranged on the first differential gear side of the two side gears of the second differential gear, and a ring gear for driving the second wheel pair is rotatably provided with respect to the case member. A four-wheel drive system for an automobile connected to a second side gear.