JPS6240577B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a four-wheel drive transfer device that is installed in an automatic transmission for an automobile and is capable of switching between four-wheel drive and two-wheel drive. [Problems to be Solved by the Invention] The purpose of the present invention is to provide a four-wheel drive system that allows switching between two-wheel drive and four-wheel drive while driving, which has been difficult with conventional four-wheel drive transfer devices. The object of the present invention is to provide a transfer device for four-wheel drive, and furthermore, to provide a four-wheel drive transfer device that is capable of changing speeds with a relatively large gear ratio within the transfer device. [Means for Solving the Problems] In order to achieve this object, the four-wheel drive transfer device of the present invention includes an input shaft, a double pinion consisting of an outer pinion and an inner pinion that mesh with each other, and the double pinion. a transmission mechanism that includes a planetary gear device having a carrier that rotatably holds a pinion, a ring gear that meshes with the outer pinion, and a sun gear that meshes with the inner pinion, and that is connected to the input shaft; one output shaft that is coaxially arranged and connected to the ring gear of the transmission mechanism; the other output shaft that is arranged parallel to the first output shaft; a sleeve disposed concentrically, a transmission mechanism connecting the sleeve and the second output shaft, and a first friction clutch removably connecting the ring gear of the transmission mechanism and the sleeve. The transmission mechanism includes a friction brake and a second friction clutch, and one of the carrier and sun gear is connected to the input shaft, and the other can be fixed by the friction brake. The rotation from the input shaft is decelerated and transmitted by the engagement of the second input shaft.
The rotation from the input shaft is transmitted by integrally rotating the planetary gear device by engagement of a friction clutch. [Example] Next, the present invention will be explained based on an example shown in the drawings. 1 is a gear transmission of an automatic transmission, 2 is an output shaft of the gear transmission 1 and an input shaft of a transfer device, 3 is a governor valve fixed to the input shaft 2, 11
40 is one output shaft of the transfer device disposed coaxially with the input shaft 2; 40 is a carrier 41 spline-fitted to the rear end of the input shaft 2;
Pinions 4A, 4B rotatably held at 1,
A planetary gear device 4 having a sun gear 43 and a ring gear 44 spline-fitted to one output shaft 11 of the transfer device via a hub 10;
A transmission mechanism includes a friction brake 5 for engaging the sun gear 43 with the front transfer case 18 via the hub 6, and a friction clutch 7 for detachably connecting the sun gear 43 and the ring gear 44; 9 is one output; The intermediate transfer case 1 is arranged concentrically with the shaft 11 and is connected to the intermediate transfer case 1 via bearings 25 and 26.
9 and the rear transfer case 20, and an oil seal 3 is provided between the sleeve 9 and the intermediate transfer case 19 and the rear transfer case 20, respectively.
0 and 31 are arranged. 8 is ring gear 44
80 is a friction clutch for removably connecting the sleeve 9 and the intermediate transfer case 19;
and a hydraulic servo 17 for a clutch 8 consisting of a cylinder 81 welded via a rib 91 to a sleeve 9 rotatably held in the rear transfer case 20 and a piston 82 attached to the cylinder 81; The intermediate transfer case 19 and the rear transfer case 2 are arranged parallel to the output shaft 11 of the
The other output shaft 12 of the transfer device, which is rotatably held at 0, is a sprocket 14 that is spline-fitted to the sleeve 9, a sprocket 15 that is spline-fitted to the other output shaft 17, and is stretched between these sprockets. a chain transmission mechanism for driving the other output shaft 17 consisting of a chain 16;
2 is an oil seal disposed between one output shaft 11 and the rear transfer case 20, and 33 is an oil seal disposed between one output shaft 11 and the intermediate transfer case 19.
34 to 37 are seal rings, and 50 is a front transfer case 1.
The cylinder 18A formed in 8 and the cylinder 1
8A is a hydraulic servo for the brake 5, which is made up of a piston 51 mounted inside, and 70 is a hydraulic servo for the friction clutch 7, which is made up of a cylinder 71 welded to the hub 6 and a piston mounted inside the cylinder 71. It is. As shown in FIG. 3, the planetary gear device 4 includes an outer pinion 4A and an inner pinion 4 that mesh with each other.
It is a double pinion type planetary gear device having a double pinion 42 made of B, the inner pinion meshes with a sun gear 43, and the outer pinion 4A meshes with a ring gear 44. This transfer device is attached to an automatic transmission T attached to a vehicle engine E as shown in FIG. 2, and one output shaft 11 is connected to a propeller shaft C for driving rear wheels, 17 is used connected to the propeller shaft B for front wheel drive. During normal driving, the hydraulic servo 70 is supplied with the line pressure supplied to the hydraulic control device of the automatic transmission to engage the clutch 7 and the hydraulic servo 50 and 80
is released to release the brake 5 and clutch 8. As a result, the sun gear 4 of the planetary gear system 4
3 and ring gear 44 are connected, and the planetary gear device 4 rotates as a unit, and power is transmitted from the input shaft 2 to one output shaft 11, which is an output shaft for driving the rear wheels, at a reduction ratio of 1.
The power is transmitted to the rear wheels, resulting in two-wheel drive driving. This 2
When four-wheel drive driving is required during wheel drive driving, a lever provided on the driver's seat or the like is operated to activate a hydraulic supply/discharge control valve (not shown) to the hydraulic servo of the transfer device. When line pressure is gradually supplied to the clutch 8 to smoothly engage the ring gear 44 and the sleeve 9, the ring gear 44 and the sleeve 9 are connected.
Power is also transmitted to the other output shaft 17, which is the front wheel drive output shaft, via the chain transmission mechanism 12, and the power is transmitted from the input shaft 2 to the front wheel and rear wheel drive output shafts 17 and 11 at a reduction ratio of 1. A four-wheel drive state is obtained. When an increase in output torque is required, such as on a steep slope during four-wheel drive driving, the hydraulic supply/discharge control valve to the hydraulic servo is activated to gradually supply line pressure to the hydraulic servo 50, and at the same time, the hydraulic servo 70 is activated at an appropriate timing. The hydraulic pressure is applied as back pressure to gradually engage the brake 5 and smoothly release the clutch 7. As a result, sun gear 43 and ring gear 44 are released and sun gear 43 is fixed, and the power is reduced from input shaft 2 via carrier 41, pinion 42 and ring gear 44 to output shaft 1.
1 and 17, and a four-wheel drive driving state with large torque is obtained. The table shows the engagement and release of the brake 5, clutches 7 and 8, and the running state of the vehicle.

[Table] In the table, ○ indicates the engaged state of the friction engagement element, and × indicates the released state. The reduction ratio λ is the ratio of the number of teeth between the sun gear 43 and the ring gear 44 of the double pinion planetary gear system, and the value of the reduction ratio is λ.
This is when the value is set to 0.45. [Effects of the Invention] As described above, the transfer device of the present invention includes a wet friction engagement element operated by a hydraulic servo and a double pinion type planetary gear device, so that smooth operation of the friction engagement element and friction Activation is easily performed with proper timing between the engaging elements, and mutual switching between two-wheel drive and four-wheel drive while driving and speed change within the transfer device are possible. In use, it is possible to change speeds with a large speed ratio within the transfer device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the transfer device of the present invention;
FIG. 2 is a schematic diagram showing the power transmission system of the vehicle, and FIG. 3 is a schematic front view of the double pinion type planetary gear device. In the figure, 1...speed change gear device, 2...input shaft, 4
...Planetary gear device, 40...Transmission mechanism, 41...
Carrier, 42...Double pinion, 43...Sun gear, 44...Ring gear, 5...Friction brake, 7, 8...Friction clutch, 9...Sleeve,
11, 17...output shaft, 12...transmission mechanism.

Claims (1)

[Claims] 1. An input shaft 2 and an outer pinion 4 that meshes with each other.
A planetary gear device 4 includes a double pinion 42 consisting of A and an inner pinion 4B, a carrier 41 that rotatably holds the double pinion, a ring gear 44 that meshes with the outer pinion, and a sun gear 43 that meshes with the inner pinion. a transmission mechanism 40 which is provided and connected to the input shaft; and one output shaft 11 which is disposed coaxially with the input shaft and connected to a ring gear of the transmission mechanism.
, the other output shaft 17 disposed parallel to the first output shaft, a sleeve 9 disposed concentrically with the one output shaft, and the sleeve and the second output shaft and a first friction clutch 8 that removably connects the ring gear of the transmission mechanism and the sleeve, and the transmission mechanism includes a friction brake 5 and a second friction clutch 7.
one of the carrier and sun gear is coupled to the input shaft and the other is fixed by the friction brake, and engagement of the friction brake decelerates rotation from the input shaft. A transfer device for four-wheel drive, characterized in that the rotation from the input shaft is transmitted by integrally rotating the planetary gear device by engagement of the second friction clutch. 2. The four-wheel drive transfer device according to claim 1, wherein the carrier is connected to the input shaft and the sun gear can be fixed by the friction brake. 3. The second friction clutch removably connects the sun gear and ring gear of the planetary gear unit.
Wheel drive transfer device. 4 The transmission mechanism has a first transmission mechanism connected to the sleeve.
A sprocket 14, a second sprocket 15 connected to the other output shaft, and a chain 16 stretched between the first and second sprockets. 4-wheel drive transfer device.