JPH03542B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention comprises four partitioned link mechanism chambers.
The present invention relates to a lubricating oil supply device for a wheel drive transfer device. (Prior Art) Conventionally, when lubricating a four-wheel drive transfer device, there has been a method in which an oil pump is provided in the four-wheel drive transfer device, or a gear or chain connecting a first output shaft and a second output shaft is lubricated. Therefore, there is a method of stirring the lubricating oil in the case of the link mechanism chamber and dispersing it on the bearing that rotatably supports the first output shaft on the fixed member, and the main transmission, the transmission mechanism, the two wheels 4, etc.
There is a method of connecting each chamber adjacent to each of the wheel switching mechanism and the link mechanism to supply lubricating oil. (Problems to be Solved by the Invention) However, providing the oil pump in the transfer device as described above not only increases cost and complicates the mechanism, but also reduces the transmission efficiency of the transfer device. Also, if it is a method using gears or chains,
If lubrication is not sufficient, there is a risk of seizure and wear of bearings, etc. Furthermore, since the link mechanism chambers are not separated, the oil level in the link mechanism chambers becomes high and the oil temperature rises due to oil agitation, resulting in a decrease in transmission efficiency. Therefore, the present invention provides a four-wheel drive transfer device that has a simple mechanism, can provide sufficient lubrication, and can maintain an appropriate amount of lubricating oil in a link mechanism that transmits power between the sleeve and the second output shaft. The purpose of the present invention is to provide a lubricating oil supply device. (Means for Solving the Problems) For this purpose, in the lubricating oil supply device for a four-wheel drive transfer device of the present invention, a transmission case and a main transmission housed in the transmission case are provided. , a switching mechanism chamber connected to the transmission case, an extension chamber provided on the output side of the switching mechanism chamber, and an extension chamber provided between the switching mechanism chamber and the extension chamber, and provided on the front wall and the rear wall. A transfer case forming a link mechanism chamber separated from the two chambers, a switching mechanism housed in the switching mechanism chamber and switching between two-wheel drive and four-wheel drive, and an output shaft of the main transmission. arranged coaxially with
A sleeve rotatably supported on the front and rear walls of the link mechanism chamber via bearings, and a first output shaft inserted through the sleeve and connected to the sleeve via a link mechanism. A second output shaft, a lubricating oil pressure generating mechanism that generates lubricating oil pressure, and a rotating member of either the sleeve or the first output shaft are provided, and lubricating oil is supplied from the lubricating oil pressure generating mechanism. a bearing lubricating means for lubricating the bearing from an oil passage through a hole formed in the rotating member; and a bearing lubricating means disposed between the front wall and rear wall and the sleeve on the link mechanism chamber side of the bearing, Equipped with an oil seal to prevent oil from leaking into the link mechanism chamber. (Operations and Effects) According to the present invention, as described above, the transmission case, the main transmission housed in the transmission case, the switching mechanism chamber connected to the transmission case, An extension chamber provided on the output side of the switching mechanism chamber, and a link mechanism chamber provided between the switching mechanism chamber and the extension chamber and separated from the two chambers by a front wall and a rear wall. a transfer case, a switching mechanism that is housed in the switching mechanism chamber and switches between two-wheel drive and four-wheel drive, and is arranged coaxially with the output shaft of the main transmission;
A sleeve rotatably supported on the front and rear walls of the link mechanism chamber via bearings, and a first output shaft inserted through the sleeve and connected to the sleeve via a link mechanism. A second output shaft, a lubricating oil pressure generating mechanism that generates lubricating oil pressure, and a rotating member of either the sleeve or the first output shaft are provided, and lubricating oil is supplied from the lubricating oil pressure generating mechanism. a bearing lubricating means for lubricating the bearing from an oil passage through a hole formed in the rotating member; and a bearing lubricating means disposed between the front wall and rear wall and the sleeve on the link mechanism chamber side of the bearing, Equipped with an oil seal to prevent oil from leaking into the link mechanism chamber. That is, since the lubricating oil in the main transmission is supplied from the oil passage provided inside the rotating member of either the sleeve or the first output shaft to the bearing through the hole formed in the rotating member, Bearings can be sufficiently lubricated. Since oil seals are provided on the link mechanism chamber side of the bearing, that is, between the transmission mechanism chamber and the link mechanism chamber, and between the link mechanism chamber and the rear chamber,
It is possible to prevent lubricating oil from leaking into the link mechanism chamber. Therefore, the oil is not stirred while the link mechanism is operating, which not only prevents the temperature of the lubricating oil from rising and reducing transmission efficiency, but also saves lubricating oil. can. In addition, the lubricating oil in the main transmission is
Since oil is supplied to the bearing from the oil passage provided inside one of the rotating members of the output shaft through the hole formed in the rotating member, there is no need to equip the transfer device with a hydraulic pump, reducing costs. can be reduced. In addition, since no power is required to drive the hydraulic pump, the engine's combustion efficiency is not compromised, the structure is simple, and the lubrication effect is sufficient, preventing burn-out and wear of bearings, etc. be able to. (Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a lubricating oil supply device for a four-wheel drive transfer device according to the present invention, and FIG. 2 is a schematic diagram showing a power transmission system of a vehicle. A lubricating oil supply device 1 of a four-wheel drive transfer device according to the present invention is connected to a gear transmission T of an automatic transmission which is a main transmission.
is a lubricating oil pressure generating mechanism that generates lubricating oil pressure,
In addition to having a built-in hydraulic control device (not shown),
An oil pan 50 is provided. The lubricating oil supply device 1 of the four-wheel drive transfer device has a two-stage transmission mechanism UD that enables a direct drive state and a deceleration drive state. The output shaft of the gear transmission T serves as the input shaft 2 of the transfer device A, and a transmission mechanism chamber 71 is provided to accommodate the rear portion of the output shaft. A switching mechanism TF for switching between two-wheel drive and four-wheel drive, and a switching mechanism chamber 72 that accommodates the switching mechanism TF are provided behind the transmission mechanism chamber 71. The switching mechanism chamber 72 also includes a front portion of the first output shaft 11 disposed coaxially with the input shaft 2,
A hollow sleeve 36 is loosely fitted to the outside of the output shaft 11 and rotatably supported by the transfer case 30 via a ball bearing 33 which is a first bearing.
Store the front part of the Further, a rear chamber 73 is provided at the rear end of the first output shaft 11, and the switching mechanism chamber 72 and the rear chamber 7
3, a link mechanism chamber 76 is formed. Oil seals 74 and 75 are provided to prevent lubricating oil from leaking into the link mechanism chamber 76. The link mechanism chamber 76 includes the sleeve 3.
A second output shaft 41 connected to the second output shaft 6 via a chain link mechanism 42 is housed therein. A lubricating oil supply oil passage 64 is provided to supply lubricating oil to the transfer device A having the above configuration. That is, lubricating oil is introduced into the input shaft 2,
First axial lubricating oil passage 3 communicating with oil pan 50
penetrates through the center, radial oil passages 4 and 5 are formed at predetermined positions, and a governor valve 6 is fixed to the outer periphery. The transmission mechanism UD also includes a sun gear 8 that is loosely fitted to the input shaft 2 by a spline, a planetary pinion 9 that meshes with the sun gear 8, and a planetary pinion 9 that meshes with the sun gear 8.
A ring gear 10 that meshes with the planetary pinion 9, a carrier 12 that rotatably holds the planetary pinion 9 and is connected to the first output shaft 11 of the transfer device A, a thrust bearing 14 that rotatably connects the carrier 12 that meshes with the sun gear 8, and a sun gear. The planetary gear transmission 7 includes a thrust bearing 16 provided between the transmission case 8 and the transfer case 15. The transmission mechanism UD also includes a hydraulic servo 19 that is formed in the transfer case 15 and is composed of a cylinder 20 with a thrust washer 22 installed between it and the ring gear 10, and a piston 21 installed in the cylinder 20. The hydraulic servo 19 operates the friction brake 17 to engage and disengage the ring gear 10 and the transfer case 18. Further, a piston 25 is installed in the cylinder 24 to which the carrier 12 is connected, and the hydraulic servo 2
6 is formed. The hydraulic servo 26 is arranged on the gear transmission T side of the planetary gear transmission 7 and connects the sun gear 8 and the carrier 12 via the friction clutch 23. The cylinder 24 is provided with a thrust washer 27 and a bushing 28 between it and the transfer case 15. The switching mechanism TF is connected to the transfer case 30, 3.
It has a sleeve 36 rotatably supported within 1. The sleeve 36 is attached to the thrust washer 3
2, the sleeve 3 is supported by a ball bearing 33, a bearing 34, and a bushing 35;
The cylinder 37 welded to the cylinder 6 and the piston 38 mounted inside the cylinder 37 constitute a hydraulic servo. The hydraulic servo is connected to the first hydraulic servo connected to the carrier 12.
It has a friction clutch that connects the output shaft 11 and the cylinder 37, and the torque transmitted to the cylinder 37 is transferred to the second output shaft 41 of the transfer device A via the sleeve 36 and one sprocket 40 of the link mechanism 42. to drive. The link mechanism 42 includes a sprocket 40 spline-fitted to the sleeve 36, a sprocket 43 spline-fitted to the second output shaft 41, and a chain 44 stretched between these sprockets. Further, a bushing 47 is provided between the ring gear 10 and the first output shaft 11. A parking gear 48 is formed in the hydraulic cylinder 24 of the friction clutch 23, and a pawl 49 meshes with the parking gear 48 when the shift lever of the automatic transmission is selected to the parking position, thereby fixing the first output shaft 11. 51 is the hydraulic servo 2 of the friction clutches 23, 39 and the brake 17 of the four-wheel drive transfer device.
A hydraulic control device supplies and discharges hydraulic pressure to 6, 29 and 19, and 52 is an oil pan for the hydraulic control device. Hydraulic pressure is supplied to the friction clutches 23, 39 and the hydraulic servos 26, 29, and 19 of the brake 17 from an oil pan 50 of the automatic transmission through a pipe 55 attached to the case 53 and transfer case 54 of the automatic transmission. and is guided through the hydraulic control device 51. Furthermore, a lubricating oil supply oil passage 64 that supplies lubricating oil to the transfer device is connected to the oil pan 50 of the automatic transmission.
A first axial lubricating oil passage 3 provided at the center of the input shaft 2 and a second axial lubricating oil passage 3 provided at the center of the first output shaft 11 connected thereto are pumped up and adjusted to a constant pressure. The lubricating oil is supplied to the lubricating oil path 56. The radial oil passages 4, 5, 57, 58, and 60 connected to the first axial lubricating oil passage 3 and the second axial lubricating oil passage 56, and the radial oil passages 4, 5, 57, 58, and 60 provided in the transfer case 15 are Through the oil passage 62, each thrust bearing 16, 13, 14, each thrust washer 27, 22, 32, each bushing 28, 4
5, 46, 35, the planetary gear set 7, the friction brake 17, and the friction clutches 23, 39 for lubrication. . Further, the oil is supplied to the bearing 34 through a first radial oil passage 59 serving as a bearing lubrication means and an oil passage 63 provided in the sleeve 36 for lubrication. The transfer device having the above configuration is attached to a gear transmission T as shown in FIG. 2, and receives power from the engine E of the vehicle via the gear transmission T. The first output shaft 11 is connected to a propeller shaft C for driving rear wheels, and the second output shaft 41 is connected to a propeller shaft B for driving front wheels. During normal driving, line pressure is supplied to the hydraulic servo 26 via the hydraulic control device of the automatic transmission, and the clutch 23 is engaged. In addition, the hydraulic servo 19,
29 releases pressure to release the brake 17 and clutch 39. As a result, the sun gear 8 and the carrier 12 of the planetary gear device 7 are connected, and power is transmitted from the input shaft 2 to the first output shaft 11 at a reduction ratio of 1.
It is possible to drive with two rear wheels. At this time, the power from the input shaft 2 is transmitted to the sun gear 8,
Since the power is transmitted from the carrier 12 to the first output shaft 11 via the friction clutch 23 without going through the power transmission system consisting of the planetary pinion 9 and ring gear 10, no load is applied to the tooth surfaces of each gear, improving the durability of the gears. will improve. When 4-wheel drive becomes necessary during this 2-wheel drive driving, operate the shift lever or shift switch installed in the driver's seat and switch the hydraulic supply/discharge control valve (not shown) to the hydraulic servo of transfer device A. ) is applied, and line pressure is gradually supplied to the hydraulic servo 29 to smoothly engage the clutch 39.
At that time, the first output shaft 11 and the sleeve 36 are connected, and power is also transmitted to the front wheels via the link mechanism 42, the second output shaft 41, and the propeller shaft B.
Power is transmitted from the input shaft 2 to the first and second output shafts 11 and 41 for driving the front and rear wheels at a reduction ratio of 1, thereby providing four-wheel drive driving. Also, during this four-wheel drive driving, when it is necessary to increase the output torque such as on a steep slope, the hydraulic pressure supply/discharge control valve to the hydraulic servo is activated, and line pressure is gradually supplied to the hydraulic servo 19. The hydraulic pressure of the hydraulic servo 26 is discharged at appropriate timing, the brake 17 is gradually engaged, and the clutch 23 is smoothly released. As a result, sun gear 8 and carrier 12 are released, ring gear 10 is fixed,
Power is decelerated from the input shaft 2 via the sun gear 8, planetary pinion 9, and carrier 12, and is transmitted to the first output shaft 11 and the second output shaft 41, resulting in a four-wheel drive driving state with high torque. Table 1 shows the engagement and release of the brake 17, clutches 23 and 39, and the running conditions of the vehicle.

[Table] In Table 1, ○ 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 8 and the ring gear 10 of the planetary gear mechanism, and the value of the reduction ratio is when λ is 0.5. Note that the present invention is not limited to the above-described embodiments, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a lubricating oil supply device for a four-wheel drive transfer device according to the present invention, and FIG. 2 is a schematic diagram showing a power transmission system of a vehicle. A... Transfer device, T... Gear transmission, 1... Lubricant oil supply device for four-wheel drive transfer device, 2... Input shaft of transfer device, 3
...First axial lubricating oil path, 4, 5, 7, 57, 5
8, 61...Radial oil path, 7...Planetary gear, 1
1...First output shaft of transfer device, 13,1
4, 16... Thrust bearing, 22, 27,
32... Thrust washer, 28, 35, 45,
46...Bushing, 33...Ball bearing (first bearing), 34...Bearing (second bearing),
50...Automatic transmission oil pan, 56...2nd
Axial lubricating oil passage, 59...first radial oil passage, 6
1... Second radial oil passage, 62, 63... Oil passage.

Claims (1)

[Claims] 1. a transmission case, a main transmission housed in the transmission case, a switching mechanism chamber connected to the transmission case, and an extension chamber provided on the output side of the switching mechanism chamber; a transfer case forming a link mechanism chamber provided between the switching mechanism chamber and the extension chamber and separated from both chambers by a front wall and a rear wall; a switching mechanism for switching between wheel drive and four-wheel drive; and a sleeve disposed coaxially with the output shaft of the main transmission and rotatably supported on the front and rear walls of the link mechanism chamber via bearings. , a first output shaft inserted through the sleeve, a second output shaft connected to the sleeve via a link mechanism, a lubricating oil pressure generation mechanism that generates lubricating oil pressure, and a first output shaft that connects the sleeve with the first output shaft. Bearing lubrication means that is provided inside one of the rotating members of the output shaft and lubricates the bearing from an oil passage through which lubricating oil is supplied from the lubricating oil pressure generating mechanism through a hole formed in the rotating member. and an oil seal disposed on the link mechanism chamber side of the bearing between the front and rear walls and the sleeve to prevent lubricating oil from leaking into the link mechanism chamber. Lubricating oil supply device for 4-wheel drive transfer equipment.