CN207539279U - A kind of automatic transmission - Google Patents

Abstract

The utility model discloses a kind of automatic transmission, including the speed changing structure being arranged in transmission case, the input terminal of speed changing structure is connect by input shaft with fluid torque-converter, output terminal drives transmission shaft that rear axle is driven to rotate by output shaft, gear includes two groups of clutches and three groups of planetary gear sets, three groups of planetary gear sets are connected respectively three groups of brakes, rear cover is provided on the right side of transmission case, downside is provided with bottom case, three groups are provided with valve body between brake and oil sump, closed hydraulic cavities are collectively formed with transmission case in the sealing ring of piston and its both sides in each brake, valve body connects corresponding hydraulic cavities through connecting portion respectively.Valve body is fixed on oil sump, by the way that oil sump is installed on case of transmission, the seal member around the hydraulic output on valve body is arranged on to be compressed, hydraulic output on entrance oil circuit and valve body short on case of transmission is directly sealed, without the operation of valve body and case of transmission is connected and sealed in connecting portion.

Description

A kind of automatic transmission

Technical field

The utility model belongs to automatic transmission technical field, and in particular to a kind of 6 gear automatic speed variators.

Background technology

The automatic transmission carried in automobile by the selective binding of multiple friction elements, passes through bending moment to engine Device is exported to be switched over to the power transfer path of gear, so as to fulfill not comparing at the same speed.In such automatic transmission, exist How to gear multi-plate brake supply hydraulic fluid and lubricating oil, how to the planetary axis for forming gear Bearing portion supplies lubricating oil, the problem of to improve its Performance And Reliability.

In general, the hydraulic pressure combined using above-mentioned multi-plate brake, is supplied from the valve body on case of transmission It should give and be set to the hydraulic cavities at piston back and controlled.But the hydraulic pressure not directly feeds hydraulic cavities from valve body, but from Valve body is supplied via the pars intramuralis oil circuit for being set to case of transmission or brake casing.It is oily when passing through case of transmission pars intramuralis Road or by transmission case pars intramuralis oil circuit and arrester shell pars intramuralis oil circuit to hydraulic cavities supply hydraulic pressure when, oil circuit can be elongated Or the bending of oil circuit can become more, therefore the liquid resistance of oil circuit can become larger, hydraulic pressure declines for seasonable response, the control of brake Property be deteriorated.And the connecting portion of oil circuit, i.e. sealing become more, increase the possibility of hydraulic leak.

In order to lubricate planetary bearing portion, the oilhole of the axial oil curb radial direction out of centrally disposed axis leads to Cross centrifugal force outflow lubricating oil, import the radial direction oil circuit in planet carrier, via the internal oil passages that are formed in planetary gear shaft with From the oil communication to the oilhole of axis peripheral surface, supplied between planetary gear and planetary gear shaft, bearing portion is lubricated.In order to protect The lubricating oil that planetary bearing portion obtains sufficient amount in high speed rotation is demonstrate,proved, planetary gear shaft during in addition to requiring assembled state On internal oil passages can be completely and in planet carrier the alignment of radial direction oil circuit or contain outer, planetary gear shaft and row when also requirement rotates Axial restraint between carrier, and cannot relatively rotate.And traditional method：

First, the radial direction oil circuit beaten in planetary gear shaft on radial direction inclined hole conducting planet carrier and above-mentioned being connected to axis periphery The oilhole in face；

Second is that planetary gear shaft both ends is made to avoid hardening in heat treatment and when planet carrier assembles using riveting method or Special designing planetary gear axle construction carries out axially position and anti-rotation using snap ring on planet carrier.

And these structure designs and method also create structure design other than it can not fully meet above-mentioned two requirements The problem of complexity, difficulty of processing increase, cost increase.

In traditional automatic transmission, the lubricating oil of gear multi-plate brake comes from respective planetary gear bearing Portion, after lubricating oil extends axially through bearing portion, after encountering the thrust washer being arranged between planetary gear and planet carrier, liquid stream side To changing, become Radial Flow, under the action of the centrifugal force, liquid stream is thrown away, and is collected into collection of the design on the inside of gear ring In oil groove.Further under the action of the centrifugal force, across the radial direction oil hole designed in oil-collecting groove location, then radially across mounted on tooth The friction plate and antithesis piece in outside are enclosed, so as to be lubricated cooling to multi-plate brake.Since such lubrication is uncontrolled, it is Continuous lubrication, when some multi-plate brake does not combine, lubricating oil is all the time radially across its friction plate and antithesis Piece.And recorded according to documents and materials, when multi-plate brake does not combine, trailing moment and pass through its friction plate and antithesis piece Lubrication flow have direct relation, lubrication flow is big, and trailing moment is big, and lubrication flow is small, and trailing moment is small.This explanation is above-mentioned more The lubricating system of piece-type brake causes trailing moment to always exist, and causes the inefficient of entire speed changer.

Utility model content

The technical problem to be solved by the utility model is to the deficiencies in for the above-mentioned prior art, provide a kind of automatic Speed changer can shorten oil duct length, improve the controlling of above-mentioned multi-plate brake, and can reduce hydraulic leak from Dynamic speed changer.

The utility model uses following technical scheme：

A kind of automatic transmission, including the speed changing structure being arranged in transmission case, the input terminal of the speed changing structure leads to It crosses input shaft to connect with fluid torque-converter, output terminal drives transmission shaft that rear axle is driven to rotate by output shaft, the gear Including two groups of clutches and three groups of planetary gear sets, planetary gear set described in three groups is connected respectively three groups of brakes, institute It states and rear cover is provided on the right side of transmission case, downside is provided with oil sump, is provided between brake and oil sump described in three groups For providing the valve body of hydraulic pressure, valve body connects the first brake, second brake and third braking by a connecting portion respectively Device, valve body and the oil circuit of the first brake and second brake are respectively less than the oil circuit length of valve body and third brake.Valve body is consolidated It is scheduled on oil sump, by the way that oil sump is installed on case of transmission, the sealing being arranged on around the hydraulic output on valve body Component will be compressed, and directly seal the hydraulic output on the entrance oil circuit and valve body of above-mentioned case of transmission epimere, without even The operation of valve body and case of transmission is connected and sealed in socket part.

Further, the sealing ring inside and outside the piston and piston in three groups of brakes respectively with corresponding transmission case Or three closed hydraulic cavities are collectively formed in rear cover, the hydraulic cavities include the first hydraulic cavities, the second hydraulic cavities and third hydraulic pressure Chamber, the valve body connect corresponding hydraulic cavities by a connecting portion respectively, shorten oil duct length, improve the control of brake Property, and hydraulic leak can be reduced, in the transmission case immediately below the first hydraulic cavities and the second hydraulic cavities and after cover Cylindrical projection is both provided at corresponding third hydraulic cavities, hydraulics inlet is provided centrally in each cylindrical projection, in the valve Body corresponding position is provided with cylindrical projection, and the center of cylindrical projection is provided with hydraulic output, and hydraulic cavities are located at transmission case On body, there is very short entrance oil circuit immediately below hydraulic cavities position on housing, each connecting portion is both provided with columned rubber Glue sealing element, the middle with hole of rubber seal, the aperture in hole are more than the diameter of hydraulics inlet and hydraulic output, pass through this entrance Oil circuit and connecting portion are directly connected to the hydraulic output being located on above-mentioned valve body.

Further, the first connecting portion between valve body and transmission case passes through the first rubber seal, the first hydraulic pressure Entrance connect to form the first short oil road with the first hydraulic cavities, and second connecting portion passes through the second rubber seal, the second hydraulics inlet It connect to form the second short oil road with second hydraulic cavities, hydraulic cavities position is formed immediately below very short entrance oil on housing Road, the hydraulic output for being directly connected to be located on above-mentioned valve body by this entrance oil circuit and connecting portion, hydraulic pressure by first through being connected respectively Short entrance oil circuit supplies fluid directly from valve body to hydraulic cavities in socket part and second connecting portion, case of transmission, can be to avoid biography It is long by oil circuit caused by transmission case and arrester shell pars intramuralis oil circuit toward hydraulic cavities delivering oil in technical solution of uniting Problem can effectively reduce liquid resistance, improve control of the valve body to the first brake and second brake.

Further, the first oil circuit and the second oil circuit are additionally provided with inside the transmission case, the valve body passes through successively Third hydraulic output, third rubber seal, the first oil circuit, the second oil circuit and the third oil circuit connection covered after being arranged on, lead to It crosses the third oil circuit connection to third hydraulic chamber and forms the long oil circuit of third.It is supplied to the hydraulic pressure of the hydraulic chamber of third brake Should, it is carried out than supplying longer path to the first brake and the hydraulic pressure of the Liang Ge hydraulic chamber of second brake, this is because The control required the first brake and second brake is more accurate than the control required third brake, can make multiple-piece system Dynamic device alternative lubrication.

Further, the first brake, second brake piston on be respectively arranged with first axis oilhole and second Axial oilhole, each piston pressing friction piece side are correspondingly arranged on the first circumferentially continuous annular groove, the first axis oilhole pair The described first circumferentially continuous annular groove and the first hydraulic cavities should be connected, it is circumferential that the described second axial oilhole corresponds to connection described second Continuous circular shape slot and the second hydraulic cavities do not need to design oil trap in gear ring inner circumferential side, while also without in oil-collecting groove location Radial direction oil hole is designed, oil trap and gear ring peripheral side is connected.

Further, it is provided with circumferentially distributed first discontinuously in the radial direction same position of the first axis oilhole Annular groove and the second discontinuous annular groove, the first discontinuous annular groove and the second discontinuous annular groove are located at friction plate and right Even on piece and the corresponding friction plate of axial penetration and antithesis piece；The radial direction same position of described second axial oilhole is provided with edge The discontinuous annular groove of circumferentially distributed third and the 4th discontinuous annular groove, the discontinuous annular groove of the third and the 4th discontinuous Annular groove is located in friction plate and antithesis piece and the corresponding friction plate of axial penetration and antithesis piece.

Further, side and first axis oil are contacted with friction plate antithesis piece in the backboard of first brake Aperture is additionally provided with the first continuous circular shape slot to same position, and the bottom of the first continuous circular shape slot is provided with the first backboard Axial oil circuit, first continuous circular shape slot and first backboard of the first backboard axial direction oil circuit on the first backboard of conducting Opposite side；Side and the second axial oil aperture are contacted with friction plate antithesis piece to identical in the backboard of the second brake Position is additionally provided with the second continuous circular shape slot, and the second backboard axial direction oil circuit is provided in the bottom of the second continuous circular shape slot, The opposite side of second continuous circular shape slot and second backboard of the second backboard axial direction oil circuit on the second backboard of conducting.When When multi-plate brake combines, piston pressing friction piece and antithesis piece, hydraulic cavities are full of hydraulic oil, and lubricating oil leads to from hydraulic cavities The axial oilhole made a living beyond the Great Wall, into the continuous circular shape slot of piston, the annular groove being then passed through on friction plate and antithesis piece enters In continuous circular shape slot on backboard, pass through the axial oil circuit of continuous circular shape trench bottom on backboard, outflow of lubrication oil, so as to multi-disc Formula brake is lubricated cooling；When multi-plate brake does not combine, there is no hydraulic oil in hydraulic cavities, only minimal amount lubricates Oily engaging friction piece and antithesis piece, trailing moment become smaller.

Further, radially perforation oil circuit is correspondingly arranged on described in every group on the planet carrier of planetary gear set, in every group of institute It states and two radial direction oil circuits is respectively arranged in the planetary gear shaft of planetary gear set, pass through an axial direction between two radial direction oil circuits Oil circuit is connected.

Further, internal oil passages include two radial direction oil circuits and an axial oil circuit in planetary gear shaft, wherein axially Oil circuit is for being connected two radial direction oil circuits, and a radial direction oil circuit half penetrates through, and another radial direction oil circuit penetrates through entirely；Half perforation is radially oily Lubricating oil is supplied between planetary gear and planetary gear shaft in road, lubricates bearing portion；Full perforation radial direction oil circuit is aligned above-mentioned planet Radial direction oil circuit on frame, receives the lubricating oil on central shaft.

Further, between the full perforation radial direction oil circuit of each planetary gear shaft and the radial direction perforation oil circuit of planet carrier Elastic cylindrical pin is provided with, on the one hand can ensure that the radial direction oil circuit on full perforation oil circuit and the planet carrier in planetary gear shaft is complete Full alignment, on the other hand can make axially to be fixed between planetary gear shaft and planet carrier, and prevent the two from opposite turn occurs It is dynamic；The inside of elastic cylindrical pin is inoculated with rubber, ensures lubricating oil not by the full perforation radial direction oil circuit of planetary gear shaft after installation It is flowed out with the elongated hole of planet carrier radial direction oil circuit, being respectively arranged with cup type in the other end of each full perforation radial direction oil circuit blocks up Head prevents oil leak.

Compared with prior art, the utility model at least has the advantages that：

The utility model automatic transmission hydraulic pressure is via connecting portion, case of transmission epimere entrance oil circuit, directly from valve body Supply fluid to hydraulic cavities, can to avoid in conventional solution by transmission case and arrester shell pars intramuralis oil circuit toward hydraulic pressure The problem of oil circuit caused by chamber delivering oil is long can effectively reduce liquid resistance, improve valve body to the controlling of brake, Er Qieyou The reduction of connecting portion, hydraulic leak are inhibited between component, can further improve controlling of the valve body to brake.

Further, lubricating oil penetrates through radial direction oil circuit, axis entirely via the radial direction oil circuit of planet carrier into planetary gear shaft To oil circuit and half perforation radial direction oil circuit, lubricating oil is supplied to planetary gear shaft bearing portion.Planet tooth can be made using elastic cylindrical pin Radial direction oil circuit is perfectly aligned on oil circuit and planet carrier on wheel shaft, and both can effectively prevent generating at work to axial Movement and rotation.Leakage it is possible to prevente effectively from lubricant passage way is blocked up using encapsulating inside elastic cylindrical pin and cup type.Using this The mechanism design of utility model is simple, process and assemble is easy, of low cost.

Further, when multi-plate brake combines, lubricating oil can as needed be lubricated it cooling, lubricate road Diameter is briefly continuous, and lubricant effect is good, and when multi-plate brake does not combine, only a small amount of lubricating oil passes through its friction plate and right Even piece can effectively reduce the trailing moment of multi-plate brake, improve the efficiency of entire automatic transmission, while no longer need Oil trap and radial direction oil hole are processed on gear ring, is also beneficial to reduce the difficulty of processing of gear ring.

Below by drawings and examples, the technical solution of the utility model is described in further detail.

Description of the drawings

Fig. 1 is the drive path figure that the utility model implements involved automatic transmission；

Fig. 2 is the shift logic figure that the utility model implements involved automatic transmission；

Fig. 3 is the sectional view that the utility model implements involved automatic transmission upper portion；

Fig. 4 is the sectional view that the utility model implements involved automatic transmission lower portion；

Fig. 5 is the discontinuous ring channel structures schematic diagram of the utility model；

Fig. 6 is the circumferentially continuous ring channel structures schematic diagram of the utility model；

Fig. 7 is the left side partial enlarged view of the utility model Fig. 3.

Specific embodiment

Automatic transmission is a short slab of domestic automobile industry, and torque 500-800Nm automatic transmission in state It is then inside a blank.The utility model provide it is a kind of meet it is domestic it is high-end in, light commercial vehicle and the needs of special vehicle Light-duty 6 speed automatic transmission.Its gear by the selective binding of multiple friction elements, passes through bending moment to engine Device is exported to be switched over to the power transfer path of gear, so as to fulfill not comparing at the same speed.In such automatic transmission, exist How to gear multi-plate brake supply hydraulic fluid and lubricating oil, how to the planetary axis for forming gear Bearing portion supplies lubricating oil, the problem of to improve its Performance And Reliability.

Referring to Fig. 1, the utility model automatic transmission is suitable for the vehicle of engine rear driving, specifically include The speed changing structure 3 being arranged in transmission case 4, the input terminal of the speed changing structure 3 are connected by input shaft 2 and fluid torque-converter It connects, output terminal drives transmission shaft that rear axle is driven to rotate by output shaft 5, and the gear 3 includes two groups of clutches and three groups Planetary gear set, planetary gear set described in three groups are connected respectively three groups of brakes, and the right side of the transmission case 4 is provided with Rear cover 6, downside are provided with oil sump 7, are provided with the valve body for providing hydraulic pressure described in three groups between brake and oil sump 7 90。

The input shaft 2 connects engine, the gear 3 and input shaft by fluid torque-converter (not shown) 2 is coaxial, and brake described in three groups includes the first brake 60, second brake 70 and third brake 80, planet described in three groups Gear set includes first planetary gear set 10, the second planetary gear set 20 and third planet gear set 30.

Referring to Fig. 3, gear 3 is stored by transmission case 4, and is closed by rear cover 6 on right side, rear cover 6 passes through bolt It is fixed in transmission case 4.

Gear 3 include first planetary gear set 10, the second planetary gear set 20, third planet gear set 30, first Planetary gear set 10, the second planetary gear set 20 and third planet gear set 30 are axially disposed in speed changer successively from left to right The inner circumferential side of shell 4, the first brake 60, second brake 70, third brake 80 are axially aligned to be arranged on the first planet tooth Wheel group 10, the second planetary gear set 20, third planet gear set 30 peripheral side.

Specifically, first planetary gear set 10, the second planetary gear set 20, third planet gear set 30 are from close to torque-converters It rises and is successively set in transmission case 4 in side.As the friction element for forming above-mentioned gear 3, first clutch 40, second from Clutch 50, the first brake 60, second brake 70, third brake 80 are also disposed in the transmission case 4, wherein, the One clutch 40 and second clutch 50 are arranged on torque-converters side, the first brake 60, second brake 70 and third brake 80 set gradually from close to torque-converters side.

First planetary gear set 10 includes the first sun gear 11, multiple first planetary gears 12, the first gear ring 13 and the One planet carrier 14, input shaft 2 are connect with the first sun gear 11, and the first sun gear 11 is engaged with the first planetary gear 12, the first row Star gear 12 is engaged with the first gear ring 13, the first gear ring 13 by the first brake 60 and transmission case 4 can clutch connection, first Planet carrier 14 is used to support the first planetary gear 12.

Second planetary gear set 20 includes the second sun gear 21, multiple second planetary gears 22, the second gear ring 23 and the Two planet carriers 24, the second sun gear 21 are connect with third sun gear 31, and the second planetary gear 22 is engaged with the second sun gear 21, the Two planetary gears 22 are engaged with the second gear ring 23, and the second gear ring 23 is connect with first planet carrier 14, and passes through second brake 70 With transmission case 4 can clutch connection, the second planet carrier 24 is used to support the second planetary gear 22, and the second planet carrier 24 passes through second Clutch 50 can clutch connection with input shaft 2.

Third planet gear set 30 includes third sun gear 31, multiple third planet gears 32, third gear ring 33 and the Three planet carriers 34, third sun gear 31 are engaged with third planet gear 32, and third planet gear 32 is engaged with third gear ring 33, the Three gear rings 33 are connect with the second planet carrier 24, and by third brake 80 and transmission case 4 can clutch connection, third planet carrier 34 are used to support third planet gear 32, and third planet carrier 34 is connect with output shaft 5.

Second sun gear 21 and third sun gear 31 can clutch connections with input shaft 2 by first clutch 40.

By more than structure, speed changing structure 3 utilizes first clutch 40,50 and first brake 60 of second clutch, the Two brakes 60, third brake 80 coupled/separated combination, obtain advance six grades and reverse gear.The assembled state and speed change The relationship of device gear represents as shown in Figure 2.

At 1 grade, first clutch 40, third brake 80 are combined；

At this point, input shaft 2 rotates the third sun gear 31 for being input to third planet gear set 30, by third planet gear set 30 slowed down with larger reduction ratio after be output to output shaft 5 from the third planet carrier 34 of the third planet gear set 30.

At 2 grades, first clutch 40, second brake 70 are combined；

At this point, input shaft 2 rotates the third sun gear 31 for being input to third planet gear set 30, while via the second planet Gear set 20 is also inputted to the third gear ring 33 of third planet gear set 30, and the rotation of input shaft 2 is with than above-mentioned 1 grade of small deceleration Than being output to output shaft 5 from the third planet carrier 34 of third planet gear set 30 after deceleration.

At 3 grades, first clutch 40, the first brake 60 are combined；

At this point, input shaft 2 rotates the third sun gear 31 for being input to third planet gear set 30, while via the first planet 10 and second planetary gear set 20 of gear set is also inputted to the third gear ring 33 of third planet gear set 30, the rotation of input shaft 2 After slowing down with reduction ratio more smaller than above-mentioned 2 grades output shaft 5 is output to from the third planet carrier 34 of third planet gear set 30.

At 4 grades, first clutch 40, second clutch 50 are combined；

At this point, input shaft 2 rotates the third sun gear 31 for being input to third planet gear set 30, while via the second planet Gear set 20 is also inputted to the third gear ring 33 of third planet gear set 30.Third planet gear set 30 is whole with inputting as a result, Axis 2 rotates integrally, and output shaft 5 is output to from third planet carrier 34 by 1 rotation of reduction ratio.

At 5 grades, second clutch 50, the first brake 60 are combined；

At this point, the rotation of input shaft 2 is directly inputted to the of third planet gear set 30 via the second planetary gear set 20 Three gear rings 33, while it is also inputted to third planet gear set 30 via 10 and second planetary gear set 20 of first planetary gear set Third sun gear 31.The rotation of input shaft 2 is output to output after speedup from the third planet carrier 34 of third planet gear set 30 Axis 5.

At 6 grades, second clutch 50, second brake 70 are combined；

At this point, the rotation of input shaft 2 is directly inputted to the of third planet gear set 30 via the second planetary gear set 20 Three gear rings 33, while it is also inputted to via the second planetary gear set 20 the third sun gear 31 of the third planet gear set 30.It is defeated Enter the rotation of axis 2 to be exported after the speed increasing ratio speedup than above-mentioned 5 grades of biggers from the third planet carrier 34 of third planet gear set 30 To output shaft 5.

During reverse gear, the first brake 60, third brake 80 are combined；

At this point, the rotation of input shaft 2 is input to the third line via 10 and second planetary gear set 20 of first planetary gear set The third sun gear 31 of star gear set 30.At this point, the direction of rotation in the second planetary gear set 20 is reversed, as a result, from The third planet carrier 34 of three planetary gear sets 30 exports the rotation opposite with 2 direction of rotation of input shaft to output shaft 5.

As described above, in the present embodiment, gear 3 by first planetary gear set 10, the second planetary gear set 20, 30 3 planetary gear sets of third planet gear set and first clutch 40, second clutch 50, the first brake 60, second system 80 5 friction elements of dynamic device 70 and third brake are formed, and are combined according to the syntagmatic in Fig. 2, are realized and advance six grades And the automatic transmission of reverse gear.

Secondly, by Fig. 3 and Fig. 4, the characteristic to the utility model is the first braking being set in gear 3 Device 60, second brake 70, third brake 80 and its concrete structure on periphery illustrate.Simultaneously to being set to gear The planetary gear bearing lubrication system of first planetary gear set 10, the second planetary gear set 20, third planet gear set 30 in 3 It illustrates.

Referring to Fig. 3, the first brake 60 is the multi-plate brake for having multiple friction plates.Including the first antithesis piece 61a, the first friction plate 61b, 62 and first backboard 63 of first piston.

There is external splines, matching internal spline 4e is formed in 4 inner peripheral surface of transmission case on the periphery of first antithesis piece 61a On.There is internal spline, matching external splines is formed in the first tooth of first planetary gear set 10 in the inner circumferential of first friction plate 61b On the peripheral surface of circle 13.

First piston 62 is used to push multiple first friction plate 61b and the first antithesis piece 61a to backboard 63 side, and piston 62 is slided Dynamic face is formed in transmission case 4.First piston 62, transmission case 4 and be arranged on two of outside in first piston 62 it is close A first closed hydraulic cavities 64 are collectively formed in seal.

Referring to Fig. 4, being bolted oil sump 7 in transmission case 4, bolt is fixed with valve body 90 on oil sump 7, First connecting portion 93a between valve body 90 and transmission case 4 is provided with the first rubber seal 92a, and hydraulic pressure is from being adjacent to speed change Valve body 90 immediately below device shell 4 is supplied to the first hydraulic cavities 64, is provided in the transmission case 4 immediately below the first hydraulic cavities 64 Cylindrical projection, convex center are provided with the first hydraulics inlet 4a, and 90 corresponding position of valve body is provided with cylindrical projection, convex center Position sets the first hydraulic output 91a.

Wherein, the first rubber seal 92a is cylindric, middle with hole, to block the first hydraulics inlet after avoiding assembling 4a and the first hydraulic output 91a, aperture can be slightly larger than the diameter of the first hydraulics inlet 4a and the first hydraulic output 91a.Simultaneously It during assembling, is pressed on valve body 90, and a prominent part.

When oil sump 7 is assembled in transmission case 4, the protrusion of the first rubber seal 92a can be with the change Cylindrical projection Elastic Contact on fast device shell 4, and the state in compressive deformation.In this way, when the first brake 60 needs hydraulic pressure When, by the effect of solenoid valve, fluid is sent out from the first hydraulic output 91a on valve body 90, passes through the first rubber seal 92a into the first hydraulics inlet 4a in transmission case 4, is sent to the first hydraulic cavities 64.And due to the first rubber seal The compressive deformation of 92a, the oil circuit from the first hydraulic output 91a to the first hydraulics inlet 4a are tightly connected.

Referring to Fig. 3, second brake 70 is that the multiple-piece with multiple friction plates is braked as the first brake 60 Device.Including the second antithesis piece 71a, the second friction plate 71b, 72 and second backboard 73 of second piston,

There is external splines on the periphery of the second antithesis piece 71a, matching internal spline 4f is formed in 4 inner peripheral surface of transmission case On.There is internal spline, matching external splines is formed in second planetary gear set 20 in the inner circumferential of the second friction plate 71b The second gear ring 23 peripheral surface on.

Second piston 72 is used to push multiple second friction plate 71b and the second antithesis piece 71a to backboard 73 side, second work The face that plug 72 slides is formed in transmission case 4.Second piston 72, transmission case 4 and it is arranged on outside in second piston 72 A second closed hydraulic cavities 74 are collectively formed in two sealing rings.

Referring to Fig. 4, hydraulic pressure is supplied to the second hydraulic chamber 74 from valve body 90, the speed change immediately below the second hydraulic cavities 74 Cylindrical projection is provided on device shell 4, is along the circumferential direction staggered with the cylindrical projection below the second hydraulic chamber 64, convex center is set Hydraulics inlet 4b is equipped with, raised same position is provided with cylindrical projection, convex center on valve body 90 and in the transmission case 4 Position sets the second hydraulic output 91b (not shown)s, the second connecting portion 93b settings between valve body 90 and transmission case 4 Have and the first isostructural second rubber seal 92b of rubber seal 92a phases.

When oil sump 7 is assembled in transmission case 4, the protrusion of the second rubber seal 92b can be with the change Cylindrical projection Elastic Contact on fast device shell 4, and the state in compressive deformation.In this way, when second brake 70 needs hydraulic pressure When, by the effect of solenoid valve, fluid is sent out from the second hydraulic output 91b (not shown)s on valve body 90, passes through second Sealing element 92b into the second hydraulics inlet 4b in transmission case 4, is sent to the second hydraulic chamber 74.And due to the second rubber The compressive deformation of sealing element 92b, from the second hydraulic output 91b (not shown)s to the oil circuit quilt of the second hydraulics inlet 4b It is tightly connected.

Referring to Fig. 3, third brake 80 is that have multiple frictions as the first brake 60 and second brake 70 The multi-plate brake of piece, including third antithesis piece 81a, third friction plate 81b, third piston 82 and third backboard 83.

There is external splines on the periphery of third antithesis piece 81a, matching internal spline 4f is formed in 4 inner peripheral surface of transmission case On.There is internal spline, matching external splines is formed in above-mentioned third planet gear set 30 in the inner circumferential of the third friction plate 81b Third gear ring 33 peripheral surface on.

Third piston 82 is used to push multiple third friction plate 81b and third antithesis piece 81a to third backboard 83 side, this Three pistons 82 are slided unlike first piston 62 and second piston 72 in transmission case 4, and the face slided is formed in rear cover 6 On.It third piston 82, rear cover 6 and is arranged on two sealing rings in outside in third piston 82 a closed third is collectively formed Hydraulic chamber 84.

Referring to Fig. 4, third hydraulic output 91c of the hydraulic pressure from valve body 90, into third rubber seal 92c, by becoming Fast 4 inside the first oil circuit 4c and the second oil circuit 4d of device shell and the third oil circuit 6a being arranged on rear cover 6 supply the third liquid Press chamber 84.Equally it is tightly connected in valve body 90 and the third connecting portion 93c of transmission case 4 by third rubber seal 92c, Connecting portion between transmission case 4 and rear cover 6 can be connected and sealed by paper washer or O-ring seal.

It is supplied to the hydraulic pressure of the third hydraulic chamber 84 of third brake 80, than to the first hydraulic chamber 64 and the second hydraulic pressure The hydraulic pressure of chamber 74 is supplied longer path and is carried out.This is because the control required the first brake 60 and second brake 70 System is more accurate than the control required third brake 80.

Valve body 90 is adjacent to the lower section of transmission case 4, and via first connecting portion 93a, second connecting portion 93b and speed changer Shell 4 connects.Hydraulic pressure is supplied directly to 64 He of the first hydraulic cavities via first connecting portion 93a and second connecting portion 93b from valve body 90 Second hydraulic cavities 74.

Simultaneously because the first hydraulic cavities 64 and the second hydraulic cavities 74 are formed directly on case of transmission 4 and the first antithesis piece The inner spline gear that 61a, the second antithesis piece 71a are meshed is also formed on case of transmission 4, so no longer needing arrester shell Body saves the inner space of cost of parts and transmission case 4.And it only needs to be located at the first hydraulic cavities 64 in transmission case 4 Very short the first hydraulics inlet 4a, the second hydraulics inlet 4b are processed with the underface of the second hydraulic cavities 74, in this way using this reality Mode is applied, hydraulic pressure passes through the first hydraulic output not by transmission case 4 or the pars intramuralis of brake casing, and from valve body 90 91a, the second hydraulic output 91b, first connecting portion 93a, second connecting portion 93b, the first hydraulics inlet 4a, the second hydraulics inlet 4b is supplied to the first hydraulic cavities 64, the second hydraulic cavities 74.It can thus be avoided pass through case of transmission in conventional solution With oil circuit caused by brake casing pars intramuralis oil circuit toward hydraulic cavities delivering oil it is long the problem of, improve valve body 90 to brake Controlling.In addition, in the oil circuit from valve body the 90 to the first hydraulic cavities 64, the second hydraulic cavities 74, the number of set component Amount, the i.e. quantity of connecting portion between component tail off, and therefore, the possibility of hydraulic leak reduces.

Moreover, in present embodiment, the first rubber seal 92a, the second rubber seal 92b are pressed on valve body 90, Valve body 90 is mounted on by bolt on oil sump 7, and oil sump 7 is bolted in transmission case 4, and thus valve body 90 is with becoming Fast device shell 4 passes through the first rubber seal 92a, the second rubber seal 92b in first connecting portion 93a, second connecting portion 93b Compressive deformation so that oil circuit by sealing connect.Connected in this way, avoiding in first connecting portion 93a, second connecting portion 93b The operation (the oil communication operation on connecting portion) of valve body 90 and transmission case 4 is connect, improves the assembling of automatic transmission.

As shown in figure 3, the planetary gear shaft 15 in first planetary gear set 10 has a first axis oil circuit 15a, the first half pass through Latus rectum penetrates through radial direction oil circuit 15c entirely to oil circuit 15b, first, wherein, the first full perforation diameter can be connected in first axis oil circuit 15a To the perforation radial direction oil circuits of oil circuit 15c and the first half 15b.

The second planetary gear shaft 25 in second planetary gear set 20 has the second axial oil circuit 25a, and the second half perforations are radially Oil circuit 25b, the second full perforation radial direction oil circuit 25c, wherein, the second full perforation radial direction oil circuit can be connected in the second axial direction oil circuit 25a The perforation radial direction oil circuits of 25c and the second half 25b.

Third planet gear shaft 35 in third planet gear set 30 has third axial direction oil circuit 35a, and third partly penetrates through radially Oil circuit 35b, third penetrate through radial direction oil circuit 35c entirely, wherein, third axial direction oil circuit 35a can be connected third and penetrate through radial direction oil circuit entirely 35c and third half penetrate through radial direction oil circuit 35b.

Moreover, the first planet carrier in first planetary gear set 10, the second planetary gear set 20, third planet gear set 30 14th, the second planet carrier 24, third planet carrier 34 are respectively arranged with first and radially penetrate through the radially perforation oil circuit of oil circuit 14a, second 24a, third radially penetrate through oil circuit 34a.

The first half perforation radial direction oil circuit 15b conducting first axis oil circuits 15a of above-mentioned first planetary gear shaft 15, the first row Between 12 and first planetary gear shaft 15 of star gear；

The second half the second axial oil circuit 25a of perforation radial direction oil circuit 25b conductings, the second row of above-mentioned second planetary gear shaft 25 Between 22 and second planetary gear shaft 25 of star gear；

The third of above-mentioned third planet gear shaft 35 half penetrates through radial direction oil circuit 35b conducting third axial direction oil circuits 35a, the third line Between star gear 32 and third planet gear shaft 35；

It is attached respectively using the first elastic cylindrical pin 17, the second elastic cylindrical pin 27, third elastic cylindrical pin 37 solid Surely ensure that the above-mentioned first full perforation radial direction oil circuit 15c, the second full perforation radial direction oil circuit 25c, third penetrate through radial direction oil circuit 35c and exist entirely Radially perforation oil circuit 14a, second radially penetrate through oil circuit 24a, third radially perforation oil circuit 34a for alignment first after assembling.

First elastic cylindrical pin, 17 one end is imported in the first full perforation radial direction oil circuit 15c of the first planetary gear shaft 15, separately One end is imported in the first radial direction perforation oil circuit 14a of first planet carrier 14.

Second elastic cylindrical pin, 27 one end is imported in the second full perforation radial direction oil circuit 25c of the second planetary gear shaft 25, separately One end is imported in the second radial direction perforation oil circuit 24a of the second planet carrier 24.

The third that 37 one end of third elastic cylindrical pin imports third planet gear shaft 35 is penetrated through entirely in radial direction oil circuit 35c, separately The third that one end imports third planet carrier 34 is radially penetrated through in oil circuit 34a.

Oil leak in order to prevent, in above-mentioned first elastic cylindrical pin 17, the second elastic cylindrical pin 27, third Elastic Circular The inside of pin 37 pours into rubber, ensures it under normal lubricating pressure, and rubber does not occur and comes off.

It is respectively further from simultaneously in above-mentioned first planetary gear shaft 15, the second planetary gear shaft 25, third planet gear shaft 35 First full perforation radial direction oil circuit 15c, the second full perforation radial direction oil circuit 25c, third penetrate through the side of radial direction oil circuit 35c with first entirely Cup type plug 16, the second cup type plug 26, third cup type plug 36 block respectively.

In this way, for first planetary gear set 10, come from the lubricating oil of central shaft from first planet carrier 14 First radially perforation oil circuit 14a, first into the first planetary gear shaft 15 penetrates through in radial direction oil circuit 15c entirely, then by the One axial oil circuit 15a, the first half perforation radial direction oil circuit 15b, is sent between the first planetary gear 12 and the first planetary gear shaft 15, Lubrication is located at bearing portion herein.

For the second planetary gear set 20, come from the lubricating oil of central shaft from the second diameter on the second planet carrier 24 It is penetrated through in radial direction oil circuit 25c entirely to perforation oil circuit 24a, second into the second planetary gear shaft 25, it is then axial by second Oil circuit 25a, the second half perforation radial direction oil circuit 25b, is sent between the second planetary gear 22 and the second planetary gear shaft 25, lubricates position In bearing portion herein.

For third planet gear set 30, come from the lubricating oil of central shaft from the third diameter in third planet carrier 34 To perforation oil circuit 34a, the third into third planet gear shaft 35 is penetrated through entirely in radial direction oil circuit 35c, then by third axial direction Oil circuit 35a, third half penetrate through radial direction oil circuit 35b, are sent between third planet gear 32 and third planet gear shaft 35, lubricate position In bearing portion herein.

As described above, in present embodiment, the first elastic cylindrical pin 17, the second elastic cylindrical pin 27, third elasticity are used Straight pin 37, in addition to the first full perforation radial direction oil circuit 15c, the second full perforation radial direction oil circuit 25c, third can be made to penetrate through entirely radially Radially radially radially perforation oil circuit 34a is perfectly aligned for perforation oil circuit 24a, third for perforation oil circuit 14a, second by oil circuit 35c and first Outside, can also make the first planetary gear shaft 15, the second planetary gear shaft 25, third planet gear shaft 35 and first planet carrier 14, Second planet carrier 24, third planet carrier 34 are fixed axially, and prevent the two from relatively rotating, and influence the confession of lubricating oil It should.

Make the first elastic cylindrical pin 17, the second elastic cylindrical pin 27,37 inside encapsulating of third elastic cylindrical pin and the simultaneously One cup type plug 16, the second cup type plug 26, third cup type plug 36 are it is possible to prevente effectively from leakage on lubricant passage way.Use this Embodiment effectively meets the requirement toward planetary gear shaft bearing portion conveying lubricating oil, structure design is simple, process and assemble is easy, It is of low cost.

As shown in Figure 3 and Figure 4, the first brake 60, the first piston 62 on second brake 70, second piston 72 are distinguished It is provided with first axis oilhole 62a, the second axial oilhole 72a.

Fig. 5 to Fig. 7 is please referred to, in first piston 62, that 72 pressing friction piece side of second piston is provided with first is circumferentially continuous Annular groove 62b, the second circumferential continuous circular shape slot 72b.Wherein, first axis oilhole 62a, the second axial oilhole 72a connections are above-mentioned First hydraulic cavities 64, the second hydraulic cavities 74 and the first circumferentially continuous annular groove 62b, the second circumferential continuous circular shape slot 72b.

The first friction plate 61b, the first antithesis piece 61a of above-mentioned first brake 60 are in the first axle of above-mentioned first piston 62 Oilhole 62a radial direction same positions are provided with the circumferentially distributed second discontinuous annular groove 61b1, the first discontinuous annular groove 61a1, the second discontinuous annular groove 61b1, the corresponding first friction plate 61b and of the first discontinuous annular groove 61a1 axial penetrations One antithesis piece 61a.

First backboard 63 of above-mentioned first brake 60 is contacting side with the first friction plate 61b, in above-mentioned first piston 62 first axis oilhole 62a radial direction same positions are provided with the first continuous circular shape slot 63a, in the first continuous annular groove 63a bottoms The first backboard axial direction oil circuit 63b is provided with, the first continuous circular shape slot 63a and the first continuous circular shape slot of the first backboard 63 is connected 63a opposite sides.

Referring to Fig. 5, the second friction plate 71b of above-mentioned second brake 70, the second antithesis piece 71a are in above-mentioned second piston 72 the second axial oilhole 72a radial direction same positions, which are provided with, circumferentially distributed has the 4th discontinuous annular groove 71b1, third not Continuous circular shape slot 71a1, the 4th discontinuous annular groove 71b1, the discontinuous annular groove 71a1 axial penetrations of third corresponding Two friction plate 71b and the second antithesis piece 71a.

Second backboard 73 of above-mentioned second brake 70 is contacting side with the second friction plate 71b, in above-mentioned second piston The axial oilhole 72a radial direction same positions of the second of 72 are provided with the second continuous circular shape slot 73a, in the second continuous annular groove 73a bottoms The second backboard axial direction oil circuit 73b is provided with, the second continuous circular shape slot 73a and the second annular groove 73a that the second backboard 73 is connected are another Side.

Above-mentioned first planetary gear set 10, the first gear ring 13 of the second planetary gear set 20,23 inner circumferential side of the second gear ring are not It needs to set oil trap, while radial direction oil hole is set also without in oil-collecting groove location, oil trap and the first gear ring 13, the is connected Two gear rings, 23 peripheral side.

In this way, when the first brake 60 combines, first piston 62 gradually compresses the first friction plate 61b and the first antithesis piece 61a, the heat that sliding wear generates in the process, needs to be taken away by lubricating oil, so as to cool down the first brake 60.At this point, the first hydraulic pressure The hydraulic oil of high pressure is full of in chamber 64, hydraulic oil is sprayed from the first axis oilhole 62a on first piston 62, into first piston 62 the first continuous circular shape slot 62b.

Under the action of pressure difference, across the second discontinuous annular groove on the first friction plate 61b and the first antithesis piece 61a 61b1, the first discontinuous annular groove 61a1, and heat exchange is carried out, in the first continuous circular shape slot 63a for reaching the first backboard 63, then By the first backboard axial direction oil circuit 63b of the first continuous circular shape slot 63a bottoms, the first backboard of outflow of lubrication oil 63 flows back to oily bottom Shell 7.And do not stop to carry out with this process, the heat that the first brake 60 generates when combining is not stopped to take away, until first Brake 60 is cooled to normal working temperature or the first brake 60 disengages.

When the first brake 60 does not combine, since high pressure oil being not present in the first hydraulic cavities 64, pass through without fluid upper State the first axis oilhole 62a on first piston 62, at this time only minimal amount of lubricating oil under surrounding components turning effort, into Enter in the first friction plate 61b and the first antithesis piece 61a.

When second brake 70 combines, second piston 72 gradually compresses the second friction plate 71b and the second antithesis piece 71a, The heat generated during sliding wear, needs to be taken away by lubricating oil, so as to cool down second brake 70.At this point, the second hydraulic cavities 74 In be full of the hydraulic oil of high pressure, hydraulic oil is sprayed from the second axial oilhole 72a in second piston 72, into second piston 72 Second continuous circular shape slot 72b.

Under the action of pressure difference, the 4th discontinuous annular groove across on the second friction plate 71b and the second antithesis piece 71a The discontinuous annular groove 71a1 of 71b1, third, and heat exchange is carried out, in the second continuous circular shape slot 73a for reaching the second backboard 73, then By the second backboard axial direction oil circuit 73b of the second continuous circular shape slot 73a bottoms, the second backboard of outflow of lubrication oil 73 flows back to oily bottom Shell 7.And do not stop to carry out with this process, the heat that second brake 70 generates when combining is not stopped to take away, until second Brake 70 is cooled to normal working temperature or second brake 70 disengages.

When second brake 70 does not combine, since high pressure oil being not present in the second hydraulic cavities 74, pass through without fluid upper State the second axial oilhole 72a in second piston 72, at this time only minimal amount of lubricating oil under surrounding components turning effort, into Enter in the second friction plate 71b and the second antithesis piece 71a.

As described above, in the present embodiment, the first brake 60 and second brake 70 are when combining, from the first hydraulic pressure Chamber 64, the second hydraulic cavities 74 pass through first axis oilhole 62a, the second axial oilhole 72a in first piston 62, second piston 72 The lubricating oil of ejection can effectively be sent to respective friction plate and antithesis piece, and carry out heat exchange, and lubrication path is briefly continuous, energy The first brake 60 and second brake 70 are effectively cooled to normal working temperature.

And when the first brake 60 and second brake 70 do not combine, only a small amount of lubricating oil can enter its friction plate And antithesis piece, the trailing moment of the first brake 60 and second brake 70 can be effectively reduced in this way, help to be promoted entire The efficiency of automatic transmission.Additionally due to no longer need the first tooth in first planetary gear set 10, the second planetary gear set 20 Setting oil trap and radial direction oil hole on the 13, second gear ring 23 are enclosed, is also beneficial to reduce the processing of the first gear ring 13, the second gear ring 23 Difficulty reduces cost.

More than content is only to illustrate the technological thought of the utility model, it is impossible to the protection model of the utility model is limited with this Enclose, it is every according to the utility model proposes technological thought, any change done on the basis of technical solution each falls within this reality Within protection domain with novel claims.

Claims (10)

1. a kind of automatic transmission, which is characterized in that including the gear (3) being arranged in transmission case (4), the speed change The input terminal of mechanism (3) is connect by input shaft (2) with fluid torque-converter, and output terminal is by output shaft (5) and is driven axis connection, Including two groups of clutches and three groups of planetary gear sets, planetary gear set described in three groups is connected respectively the gear (3) Three groups of brakes are provided with rear cover (6) on the right side of the transmission case (4), and downside is provided with oil sump (7), system described in three groups The dynamic valve body (90) being provided between device and oil sump (7) for providing hydraulic pressure, the valve body (90) is respectively by a connection Portion connects the first brake (60), second brake (70) and third brake (80), the valve body (90) and the first brake (60) and the oil circuit of second brake (70) is respectively less than the oil circuit length of valve body and the third brake (80).

2. a kind of automatic transmission according to claim 1, which is characterized in that piston and piston in three groups of brakes Inside and outside sealing ring three closed hydraulic cavities, the liquid respectively is collectively formed with corresponding transmission case (4) or rear cover (6) Chamber is pressed to include the first hydraulic cavities (64), the second hydraulic cavities (74) and third hydraulic chamber (84), the valve body (90) is passed through respectively One connecting portion connects corresponding hydraulic cavities, the transmission case immediately below the first hydraulic cavities (64) and the second hydraulic cavities (74) (4) cylindrical projection is both provided at and at the transmission case (4) of corresponding third hydraulic chamber (84), in each cylindrical projection Hydraulics inlet is provided centrally with, corresponding position is provided with cylindrical projection in the valve body (90), and the centre bit of cylindrical projection installs Hydraulic output is equipped with, each connecting portion is both provided with columned rubber seal, the middle with hole of the rubber seal, institute The aperture for stating hole is more than the diameter of the hydraulics inlet and hydraulic output.

3. a kind of automatic transmission according to claim 2, which is characterized in that in the valve body (90) and transmission case (4) first connecting portion (93a) between passes through the first rubber seal (92a), the first hydraulics inlet (4a) and first liquid Chamber (64) is pressed to connect and forms the first short oil road, second connecting portion (93b) passes through the second hydraulics inlet (4b), the second rubber seal (92b) is connect with second hydraulic cavities (74) forms the second short oil road.

4. a kind of automatic transmission according to claim 2, which is characterized in that also set up inside the transmission case (4) There are the first oil circuit (4c) and the second oil circuit (4d), the valve body (90) is close by third hydraulic output (91c), third rubber successively Sealing (92c), the first oil circuit (4c), the second oil circuit (4d) are connect with the third oil circuit (6a) being arranged on rear cover (6), pass through institute It states third oil circuit (6a) and is connected to third hydraulic chamber (84) the formation long oil circuit of third.

5. a kind of automatic transmission according to claim 1, which is characterized in that in the first brake (60), the second braking First axis oilhole (62a) and the second axial oilhole (72a), each piston pressing friction are respectively arranged on the piston of device (70) Piece side is correspondingly arranged on the first circumferentially continuous annular groove (62b) and the second circumferential continuous circular shape slot (72b), the first axis oil Hole (62a) is corresponding to connect the first circumferentially continuous annular groove (62b) and the first hydraulic cavities (64), the described second axial oilhole (72a) corresponding described second circumferential continuous circular shape slot (72b) of connection and the second hydraulic cavities (74).

6. a kind of automatic transmission according to claim 5, which is characterized in that in the first axis oilhole (62a) Radial direction same position is provided with the discontinuous annular groove of circumferentially distributed first (61a1) and the second discontinuous annular groove (61b1), The first discontinuous annular groove (61a1) and the second discontinuous annular groove (61b1) are on friction plate and antithesis piece and axial Penetrate corresponding friction plate and antithesis piece；

The radial direction same position of described second axial oilhole (72a) is provided with the discontinuous annular groove of circumferentially distributed third (71a1) and the 4th discontinuous annular groove (71b1), the discontinuous annular groove of third (71a1) and the 4th discontinuous annular groove (71b1) is on friction plate and antithesis piece and the corresponding friction plate of axial penetration and antithesis piece.

7. a kind of automatic transmission according to claim 6, which is characterized in that in the backboard of first brake (60) Side is contacted with friction plate antithesis piece and first axis oilhole (62a) radial direction same position is additionally provided with the first continuous circular shape Slot (63a) is provided with the first backboard axial direction oil circuit (63b), first back of the body in the bottom of the first continuous circular shape slot (63a) Board shaft is to oil circuit (63b) for the another of the first continuous circular shape slot (63a) on the first backboard (63) and the first backboard to be connected Side；

Side and second axial oilhole (72a) diameter are contacted with friction plate antithesis piece in the backboard of the second brake (70) The second continuous circular shape slot (73a) is additionally provided with to same position, is provided in the bottom of the second continuous circular shape slot (73a) Two backboard axial direction oil circuits (73b), the second backboard axial direction oil circuit (73b) are second continuous on the second backboard (73) for being connected The opposite side of annular groove (73a) and the second backboard.

A kind of 8. automatic transmission according to claim 1, which is characterized in that the planet carrier of planetary gear set described in every group On be correspondingly arranged on radially perforation oil circuit, two radial directions are being respectively arranged with described in every group in the planetary gear shaft of planetary gear set Oil circuit passes through an axial oil circuit between two radial direction oil circuits and is connected.

A kind of 9. automatic transmission according to claim 8, which is characterized in that two radial direction oil circuits in planetary gear shaft It is made of one and half perforation radial direction oil circuits and a full perforation radial direction oil circuit, the half perforation radial direction oil circuit supplies lubricating oil to row Between star gear and planetary gear shaft, for lubricating bearing portion, the full perforation radial direction oil circuit is aligned the diameter on the planet carrier To perforation oil circuit, for receiving the lubricating oil on central shaft.

10. a kind of automatic transmission according to claim 9, which is characterized in that in the complete of each planetary gear shaft Elastic cylindrical pin, the inside of the elastic cylindrical pin are both provided between the radial direction of perforation radial direction oil circuit and planet carrier perforation oil circuit Rubber is inoculated with, cup type plug is respectively arranged in the other end of each full perforation radial direction oil circuit.