IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0742756
(2003-12-23)
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우선권정보 |
JP-0372412 (2002-12-24) |
발명자
/ 주소 |
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출원인 / 주소 |
- Aisin Seiki Kabushiki Kaisha
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대리인 / 주소 |
Burns, Doane, Swecker &
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인용정보 |
피인용 횟수 :
4 인용 특허 :
2 |
초록
▼
A lubricating system for an automatic transmission including at least one planetary gear set and plural friction engagement elements includes an oil pump which pumps oil to generate oil pressure in response to activation of a driving power source and an introducing passage which is provided at a pla
A lubricating system for an automatic transmission including at least one planetary gear set and plural friction engagement elements includes an oil pump which pumps oil to generate oil pressure in response to activation of a driving power source and an introducing passage which is provided at a planetary carrier of the at least one planetary gear set, receives the oil from the oil pump and directs the oil for purposes of lubrication.
대표청구항
▼
1. A lubricating system for an automatic transmission adapted to change a speed change ratio between an input shaft of the transmission and an output shaft connected to an axle in response to activation of a driving power source, the automatic transmission comprising at least one planetary gear set
1. A lubricating system for an automatic transmission adapted to change a speed change ratio between an input shaft of the transmission and an output shaft connected to an axle in response to activation of a driving power source, the automatic transmission comprising at least one planetary gear set and plural friction engagement elements that are adapted to be engaged or disengaged, the at least one planetary gear set comprising a sun gear connected to the input shaft to rotate together with the input shaft, a ring gear, at least one rotatable pinion gear arranged between the sun gear and the ring gear, and a planetary carrier supporting the at least one pinion gear for rotation and fixed to a casing of the transmission, the lubricating system comprising:an oil pump which pumps oil to generate oil pressure in response to the activation of the driving power source; and an introducing passage which is provided at the planetary carrier and receives the oil from the oil pump and directs the oil for purposes of lubrication. 2. The lubricating system for an automatic transmission according to claim 1, further comprising:an auxiliary driving gear connected to the sun gear to rotate together with the sun gear; a pinion pin provided at the planetary carrier, the at least one pinion gear being mounted on the pinion pin; a first bearing provided between an inner peripheral surface of the at least pinion gear and an outer peripheral surface of the pinion pin; and a second bearing provided between the sun gear and the planetary carrier, the oil from the oil pump being guided to the first bearing via the introducing passage of the planetary carrier and being guided to the second bearing. 3. The lubricating system for an automatic transmission according to claim 2, further comprising:a communicating bore provided at the pinion pin which communicates with a space between the outer peripheral surface of the pinion pin and the inner peripheral surface of the at least pinion gear in which is positioned the first bearing, wherein the first bearing is lubricated with the oil from the oil pump via the introducing passage and the communicating bore. 4. The lubricating system for an automatic transmission according to claim 3, wherein the communicating bore includes a first bore extending from one end surface of the pinion pin towards an opposite end surface of the pinion pin, and a second bore communicating with the first bore and extending to the outer peripheral surface of the pinion pin so that the oil is introduced into the first bore after passing through the introducing passage and is directed to the outer peripheral surface of the pinion pin by way of the second bore.5. The lubricating system for an automatic transmission according to claim 2, further comprising:a lubricating groove at a surface of the planetary carrier facing the at least one pinion gear, the oil being guided to the second bearing by way of the lubricating groove to lubricate the second bearing. 6. The lubricating system for an automatic transmission according to claim 3, further comprising:a lubricating groove at a surface of the planetary carrier facing the at least one pinion gear, the oil in the space between the outer peripheral surface of the pinion pin and the inner peripheral surface of the at least one pinion gear being directed by way of the lubricating groove to a clearance between the planetary carrier and the sun gear to lubricate the second bearing which is positioned in the clearance. 7. The lubricating system for an automatic transmission according to claim 5, further comprising:a washer provided between the planetary carrier and the at least one pinion gear and having a notch permitting oil in a space between the outer peripheral surface of the pinion pin and the inner peripheral surface of the at least one pinion gear to flow into the lubricating groove. 8. The lubricating system for an automatic transmission according to claim 6, further comprising:a washer provided between the planetary carrier and the at least pinion gear and having a notch permitting oil in the space between the outer peripheral surface of the pinion pin and the inner peripheral surface of the at least one pinion gear to flow into the lubricating groove. 9. The lubricating system for an automatic transmission according to claim 1, wherein the planetary gear set is a double pinion type or a single pinion type.10. An automatic transmission which changes a speed change ratio between an input shaft of the transmission and an output shaft connected to an axle in response to activation of a driving power source, comprisingplural friction engagement elements adapted to be engaged or disengaged; an oil pump which pumps oil in response to the activation of the driving power source to generate oil pressure; at least one planetary gear set comprising: a sun gear connected to the input shaft to rotate together with the input shaft; a ring gear; a planetary carrier fixed to a casing of the transmission; a pinion pin mounted on the planetary carrier; a pinion gear supported on the pinion pin and arranged between the sun gear and the ring gear; and means provided at the planetary carrier for directing oil pumped by the oil pump towards a space between an inner peripheral surface of the pinion gear and an outer peripheral surface of the pinion pin. 11. The automatic transmission according to claim 10, wherein the means for directing oil is a passage formed in the planetary carrier that extends radially inwardly from an outer periphery of the planetary carrier.12. The automatic transmission according to claim 10, further comprising:an auxiliary driving gear connected to the sun gear to rotate together with the sun gear; a first bearing provided in the space between the inner peripheral surface of the pinion gear and the outer peripheral surface of the pinion pin; and a second bearing provided between the sun gear and the planetary carrier, the oil pumped by the oil pump being directed towards the space via the means for directing oil to lubricate the first bearing and being guided from the space to the second bearing to lubricate the second bearing. 13. The automatic transmission according to claim 12, further comprising:communicating means provided at the pinion pin for communicating with the space between the outer peripheral surface of the pinion pin and the inner peripheral surface of the at least pinion gear, the oil being guided to the space via the means for directing and via the communicating means to lubricate the first bearing. 14. The automatic transmission according to claim 12, further comprising first and second bores formed in the pinion pin, the first bore being a blind bore extending from one end surface of the pinion pin towards an opposite end surface of the pinion pin, the second bore extending from the first bore to the outer peripheral surface of the pinion pin, the oil being guided to the space between the outer peripheral surface of the pinion pin and the inner peripheral surface of the at least pinion gear via the means for directing and via the first and second bores.15. The automatic transmission according to claim 13, further comprising:a groove provided in a surface of the planetary carrier, the groove communicating with a clearance between an inner peripheral surface of the planetary carrier and an outer peripheral surface of the sun gear, the second bearing being located in the clearance; and a washer provided between the planetary carrier and the at least pinion gear, the washer being provided with a notch permitting oil in the space between the outer peripheral surface of the pinion pin and the inner peripheral surface of the at least pinion gear to flow into the groove which communicates with the clearance to lubricate the second bearing. 16. The automatic transmission according to claim 10, wherein the planetary gear set is a double pinion type or a single pinion type.17. A method of lubricating an automatic transmission adapted to change a speed change ratio between an input shaft of the transmission and an output shaft connected to an axle in response to activation of a driving power source, the transmission comprising at least one planetary gear set and plural friction engagement elements that are adapted to be engaged or disengaged, the at least one planetary gear set comprising a sun gear connected to the input shaft to rotate together with the input shaft, a ring gear, at least one pinion gear arranged between the sun gear and the ring gear, and a planetary carrier rotatably supporting the at least one pinion gear, the method comprising:pumping oil within the transmission upon activation of the driving power source; and directing the oil along a passage in the planetary carrier while the planetary carrier is fixed to a casing of the transmission. 18. The method of lubricating an automatic transmission according to claim 17, wherein the transmission further comprises:an auxiliary driving gear connected to the sun gear to rotate integrally with the sun gear, a pinion pin mounted at the planetary carrier and rotatably supporting the at least one pinion gear, a first bearing positioned in a space between an inner peripheral surface of the at least pinion gear and an outer peripheral surface of the pinion pin, and a second bearing provided in a clearance between an outer peripheral surface of the sun gear and an inner peripheral surface of the planetary carrier; the method further comprising: guiding the oil to the space via the passage to lubricate the first bearing; and guiding the oil from the space to the clearance to lubricate the second bearing. 19. The method of lubricating an automatic transmission according to claim 18, wherein the pinion pin is provided with a communicating bore that opens to the space between the inner peripheral surface of the at least pinion gear and the outer peripheral surface of the pinion pin, and wherein the oil is guided to the space by way of the passage and the communicating bore.20. The method of lubricating an automatic transmission according to claim 18, wherein the pinion pin is provided with a first bore which opens to one end surface of the pinion pin and a second bore communicating with the first bore and extending from the first bore to the outer peripheral surface of the pinion pin, and wherein the oil is guided to the space by passing through the passage, through the first bore and through the second bore.21. The method of lubricating an automatic transmission according to claim 18, wherein a surface of the planetary carrier facing the at least one pinion gear is provided with a lubricating groove, and wherein the oil is guided from the space to the clearance by way of the lubricating groove.22. The method of lubricating an automatic transmission according to claim 21, including a washer provided between the planetary carrier and the at least one pinion gear, the washer being provided with a notch, and wherein the oil is guided from the space to the clearance by way of the lubricating groove and the notch in the washer.
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