JPS5945222A - Transmission gear of full-time type four-wheel drive vehicle - Google Patents

Abstract

PURPOSE:To simplify the entire constitution of a transmission system by coaxially mounting a central differential gear on one of axles of front and rear wheels on the engine side and constituting the differential gear as to make direct transmission of the power of an engine output shaft. CONSTITUTION:A central differential gear 6 provided with a final reduction gear 5 is coaxially mounted on a front wheel axle 3 in the approximately middle position thereof, and a front wheel differential gear 7 is disposed adjacently to the differential gear 6. Similarly, a rear wheel differential gear 9 provided with a final reduction gear 8 is mounted on a rear wheel axle 4. Said final reduction gear 5 is composed of both a bevel gear 11 which is fixed to the end part of a transmission gear output shaft 10, and a bevel gear 12 which is integrated with the differential case of said central differential gear 6 so that the revolution of a hollow shaft 18 driven by a side gear 14b which passes through the bevel gear 12 may be transmitted to a rear drive shaft 20 via a pair of bevel gears 19. The side gear 14a of the central differential gear 6 is directly connected to the differential case 16 of the front wheel differential gear 7 via a hollow shaft 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a central differential 8 device with a 1lfi + 41
This relates to full-time four-wheel drive in which the wheels are constantly driven, and particularly relates to the transmission system associated with the provision of a central differential.

During full-time 4-wheel drive, general (before 32 turns).

In order to compensate for the speed difference due to the difference in the turning radius of the rear wheels, a center difference 8 device is installed in the transmission system between the front and rear wheels.

By the way, regarding the arrangement of this central differential (1rl),
Conventionally, for example, as proposed in Japanese Patent Application Laid-Open No. 55-72420, it is mounted approximately midway between the front and rear axles, and from this central differential device a good drive shaft is used to drive the front and rear wheels. The structure is such that the transmission system is complicated.In particular, in the case of a horizontal engine type, the transmission output shaft and the drive shaft from the transmission output shaft to the central difference 8 device are almost perpendicular to each other. This further complicates the transmission system, which is disadvantageous.

In view of these circumstances, the present invention has been developed to simplify the overall configuration of the transmission system by arranging the central differential at an appropriate (f?) position, and to create a full-length differential system that does not cause disadvantages even in the case of a transverse engine type. The purpose of this company is to provide a transmission device for time-type four-wheel drive vehicles.

For this purpose, the device according to the present invention originally has no reason to place the central differential device between the front and rear wheels, and distributes power from the central differential device to the front and rear wheels. Focusing on the fact that it is sufficient to do so, and that it is also necessary to take into account the support of the motor when arranging the medium-heat differential, we set the medium-heat differential to 6h, and installed one of the rear wheels on the engine side. Place it on the + II - (with the support on the right, and from the central differential forward, directly towards the first thread wheel, only when the other force is 'hl'! The following is a detailed explanation of an example of the present invention with reference to the drawings. -The figure is for an 11-ton 1 engine, where r31a, ib are front wheels, 2a, 2b4.L;
Rear wheel, 3 is 11r single wheel axle, 4 is rear wheel axle (aru 3, zoko de,)] Because it is a control engine, front wheel center axle 3
A central differential device F? has a final reduction gear 5 approximately in the middle of the central differential device F? 6
are arranged coaxially, a front wheel differential device 7 is arranged next to this central differential device 6, and a rear wheel rJ1. A rear wheel differential device 9 is also installed on the shaft 4, which shifts the final reduction gear 8 to the right.
When the engine and speed change output shaft 10 is perpendicular to the solid line L-) in the figure, the pinion 11 of the bevel gear A7 and the ring gear 1112 mesh with each other, and the differential gear of the central differential gear 6, - is connected to the ring gear 1712. The keys 13 fit together. , rC-One side l゛%/in the differential case 13
14,1 is the front wheel difference 1.1 through the hollow lll1h15. I.J.
Directly connects to the differential case 1G of the device 7, and connects the differential case 1
One of the lead gears 1y17a in 6 is configured to transmit power to the right front wheel 1a via the axle 3a. Also, differential case 16
The axle 3b from the other 4 noid gear j717b is the central differential @6 differential case 13.1 noid gear 14a,
14b, hollow shaft 15, link 1'V712 center is passed through 7'r: side width 11) transmission configuration.

Next, as a transmission system from the medium-fire differential device 6 to the rear wheel side,
The hollow shaft 18 from the side gear 141) is connected to the ring gear V1.
2 is penetrated () and taken out on the NoE side, and this hollow @18
The direction is changed by a pair of bevel gears 19, and the hair 7 is connected to a drive shaft 20. And Suke 20 is the joint 21 (!
: Final reduction gear position 8 on the rear wheel side via the right propeller shaft 22
1fIJ was established.

Since it is configured in this way, the engine power is input to the central differential device 6 when driving in both directions, and the
4a to the front wheel differential device 7 via the hollow shaft 15, and from the lead gear V141) to the rear wheel differential device 9 via the hollow shaft 18, bevel gear 19, propeller shaft 22, etc. at a constant torque ratio. Then, each difference vJ device 7, 9 to city 1
At 1113.4 J, Reno [G's front wheels 1a, 11+ and rear wheels 2a; During a turn, the distribution ratio of rotation from the medium-heat differential 6 is changed according to the speed difference between the front and rear wheels, and the distribution ratio of the rotation from the medium-heat differential 6 is changed depending on the speed difference between the front and rear wheels. As a result, the distribution ratio is distributed to the stomach, and in this way, the four wheels are driven to rotate at a speed corresponding to half of each turn, and turn smoothly.

In addition, ``: In the above example, one carrot I! 1
If the transmission output M10 is medium, the spark difference is 8! ! i 6 and instep (1
Therefore, the final reduction gear 5 becomes a spur gear mesh as shown by the dashed line in the figure. Furthermore, if the rear engine is used, the central differential device 6 may be placed on the rear wheel 4 side.

According to the present invention, which is clear from the above description, the central differential device 6 is disposed coaxially with the axle.
By using N+ as a support shaft, you can improve the space inside the room. In addition, because of the single upper arrangement structure, the central differential device 6 can be directly connected to the transmission output @10 in either a vertical or horizontal engine, and can also be applied to either the front or rear wheels. A shaft is required only for power transmission of 4T.It has a very simple structure and there is little loss in V-Tsuka.

[Brief explanation of drawings]

The drawing is a plan view showing an embodiment of the apparatus according to the present invention. 1 a, 11+---front wheel, 2a, 211-rear wheel, 3, 3a, 3b, 4...width axis, 5.8...
Final reduction gear, 6... Central differential, 7... Front wheel absentee device, 9... Rear wheel differential, 1()... Transformation (multi-output shaft, 11... Vinyl A °n, 12...7 to linguine
．． 13゜16-...differential case, 1/la, 14t
+ ,, 17a, 1'7b - Ride 4th・, 1
'5. Ill...Hollow shaft, one...Bebergie\-
, 20...su~7 drive shaft, 21... coupling, 22
...propeller shaft. Special R (Applicant: Fuji Heavy Industries Co., Ltd., 1 Rihito, Patent Attorney: Makoto Kobashi, Patent Attorney: Susumu Murai)

Claims (1)

[Claims] A central differential device is placed on the same axis in the small and medium 111 of ~h on the engine side of the front and rear wheels, and the central differential device is configured to directly transmit power to the transmission output shaft, and the central differential 1) + joint It is a full-time type 4-wheel type, characterized by a direct transmission of 1M to the differential 1III rig of the axle on which it is arranged, and a power transmission structure between the bell gear of the Sen's axle via a shaft, etc. Drive vehicle transmission deviceゎ