التفاصيل البيبلوغرافية
| العنوان: |
Four-wheel drive apparatus for automotive vehicles |
| Patent Number: |
4,898,259 |
| تاريخ النشر: |
February 06, 1990 |
| Appl. No: |
07/174,817 |
| Application Filed: |
March 29, 1988 |
| مستخلص: |
A full-time four-wheel drive apparatus for an automotive vehicle includes a planetary gear unit for shifting purposes, a shift changeover unit, a differential unit and a transfer unit for transferring rotating power from the rear-wheel side to the front-wheel side or vice versa. The shift changeover unit is arranged on the side of said planetary gear unit directed to the input shaft of the four-wheel drive apparatus, the carrier of the planetary gear unit is connected to the output shaft of the four-wheel drive apparatus, the differential unit is arranged between the planetary gear unit and the transfer unit, and a rotating force outputted by the planetary gear unit is transferred to the rear-wheel side and front-wheel side. Fluxure force exerted on a main shaft caused by the transfer unit based on a chain is eliminated and axial length of the apparatus is reduced. |
| Inventors: |
Fujitani, Yuuki (Toyota, JPX); Kawakami, Kouji (Ciryu, JPX) |
| Assignees: |
Aisin Seiki Kabushiki Kaisha (Kariya, JPX) |
| Claim: |
What is claimed is |
| Claim: |
1. A four-wheel drive apparatus comprising a planetary gear unit for shifting, a shift changeover unit, a differential planetary gear unit and a transfer unit for transferring rotating power from one of a rear-wheel slide and a front-wheel side to the other |
| Claim: |
wherein said shift changeover unit is arranged on a side of said planetary gear unit directed to an input shaft of the four-wheel drive apparatus, a carrier of said planetary gear unit is connected to a main output shaft, said differential planetary gear unit is arranged between said planetary gear unit and said transfer unit, the differential planetary gear unit includes a differential planetary ring gear coupled directly to said carrier of the planetary gear unit, a differential planetary carrier coupled directly to drive means of said transfer unit and e differential planetary sun gear coupled directly to an output shaft, and a rotating force outputted by said planetary gear unit is transferred to said rear-wheel side and said front-wheel side. |
| Claim: |
2. The four-wheel drive apparatus according to claim 1, wherein said shift changeover unit includes a shift sleeve meshing at all times with a gear integral with the input shaft, said shift sleeve being meshed with a gear integral with the output shaft or a gear integral with a sun gear of said planetary gear unit when slid in an axial direction. |
| Claim: |
3. The four-wheel drive apparatus according to claim 2, wherein said shift sleeve is capable of assuming a neutral position in which it meshes with neither the gear integral with the output shaft nor the gear integral with the sun gear of said planetary gear unit. |
| Claim: |
4. The four-wheel drive apparatus according to claim 2, wherein said shift changeover unit is changed over to a high-speed side when said shift sleeve is meshed with the gear planetary carrier and the planetary ring gear in such a manner that the planetary carrier and planetary ring gear rotate in unison integral with said output shaft, and a low-speed side when said shift sleeve is meshed with the gear integral with the sun gear of said planetary gear unit. |
| Claim: |
5. The four-wheel drive apparatus according to claim 1, wherein a sun gear of said planetary gear unit is integrally coupled with the input shaft, and said shift changeover unit includes a first clutch attached between the input shaft and the planetary carrier of said planetary gear unit, and a second clutch attached between a casing of the apparatus and a ring gear of said planetary gear unit. |
| Claim: |
6. The four-wheel drive apparatus according to claim 5, wherein said first and second clutches each comprise a multiple-disk clutch. |
| Claim: |
7. The four-wheel drive apparatus according to claim 5, wherein said shift changeover unit is changed over to a high-speed side when said first clutch is engaged and said second clutch is disengaged, and to a low-speed side when said first clutch is disengaged and said second clutch is engaged. |
| Claim: |
8. The four-wheel drive apparatus according to claim 1, wherein said differential unit comprises a double pinion-type planetary gear unit having a differential unit planetary ring gear coupled with the planetary carrier of said planetary gear unit for shifting so as to rotate in unison therewith. |
| Claim: |
9. The four-wheel drive apparatus according to claim 8, wherein said planetary carrier of said differential unit is coupled with the transfer unit, and said differential unit includes a differential lock/unlock changeover sleeve for coupling the planetary carrier and the planetary ring gear in such a manner that the planetary carrier and planetary ring gear rotate in unison. |
| Claim: |
10. The four-wheel drive apparatus according to claim 9, wherein said differential changeover sleeve includes a neutral position. |
| Claim: |
11. A four-wheel drive apparatus comprising a planetary gear unit for shifting, a shift changeover unit, a differential planetary gear unit and a transfer unit for transferring rotating power from one of a rear-wheel side and a front-wheel side to the other |
| Claim: |
wherein said shift changeover unit is arranged on a side of said planetary gear unit directed to an input shaft of the four-wheel drive apparatus, a carrier of said planetary gear unit is connected to a main output shaft, said differential planetary gear unit is arranged between said planetary gear unit and said transfer unit, and |
| Claim: |
said differential unit comprises a double pinion-type planetary gear unit having a differential unit planetary ring gear coupled with the planetary carrier of said planetary gear unit for shifting so as to rotate in unison therewith and a differential planetary carrier coupled directly to drive means of said transfer unit, and a rotating force outputted by said planetary gear unit is transferred to said rear-wheel side and said front-wheel side. |
| Claim: |
12. The four-wheel drive apparatus according to claim 11, wherein said planetary carrier of said differential planetary gear unit is coupled with the transfer unit, and said differential planetary gear unit includes a differential lock/unlock changeover sleeve for coupling the planetary carrier and the planetary ring gear in such a manner that the planetary carrier and planetary ring gear rotate in unison. |
| Claim: |
13. The four-wheel drive apparatus according to claim 12, wherein said differential changeover sleeve includes a neutral position. |
| Current U.S. Class: |
180/250; 74/665G |
| Current International Class: |
B60K 17352 |
| Patent References Cited: |
4678055 July 1967 Yoshinka et al. |
| Primary Examiner: |
Marmor, Charles A. |
| Assistant Examiner: |
Camby, Richard |
| Attorney, Agent or Firm: |
Burns, Doane, Swecker & Mathis |
| رقم الانضمام: |
edspgr.04898259 |
| قاعدة البيانات: |
USPTO Patent Grants |