JPH0368256B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of Industrial Application) The present invention relates to an automatic transaxle device used as an automatic transmission for a front engine/front wheel drive vehicle (FF vehicle) or a rear engine/rear wheel drive vehicle (RR vehicle). (Prior Art) Conventional automatic transaxle devices include the Mitsubishi Motors 3-speed forward automatic transaxle, but in all automatic transaxles, the inside of the transaxle case is connected to the converter housing side (input side). A partition wall (supporting the one-way brake and supporting the cylinder of the low reverse clutch) is provided to separate the output gear side (output side), and the planetary gear assembly storage chamber and the clutch storage chamber are separated. was normal. For this reason, when assembling an automatic transaxle, parts must be sequentially assembled from both ends of the transaxle case, which results in extremely poor assembly work efficiency and prevents automation. This problem becomes even more pronounced in the case of a four-speed automatic transaxle, which has many more components, and a solution to this problem has been desired. Therefore, the applicant of the present application has developed an automatic transaxle which solves the above problem by allowing each component to be assembled sequentially from only one end toward the closed end of the transaxle case, as disclosed in Japanese Patent Application Laid-Open No. 55-40367. has already been proposed. (Problem to be Solved by the Invention) However, in this automatic transaxle, of the band brake that is unavoidable for automatic transmissions and the low reverse brake that is indispensable to have a multi-plate type, the former band brake is used at the closed end of the transaxle case. Also, because the latter's low reverse brake was placed near the open end of the transaxle case, it was not possible to pre-assemble multiple parts for the following reasons, and almost all the parts were assembled sequentially from the closed end of the transaxle case. I had no choice but to rely on the assembly procedure. That is, because of the above arrangement of the low reverse brake, its actuating piston surrounds the entire circumference of the band brake when it is fitted and installed in the closed end of the transaxle case. On the other hand, since the actuating piston of the low reverse brake has a smaller inner diameter than the band brake at the part where it fits into the closed end of the transaxle case, it must be fitted and installed prior to installing the band brake. In the next assembly procedure, the drum to be tightened and fixed by the band brake is placed within the closed end of the transaxle case, and then the band brake is placed over the outer periphery of the drum. By the way, due to restrictions on the diameter of the transaxle case, the annular gap between the drum and the low-reverse brake operating piston that surrounds it is not as large as the one on the left, and the above-mentioned installation work of the band brake to this gap is difficult. Explore difficulties. This problem becomes more pronounced as the axial dimension of the drum increases, and eventually it becomes impossible to mount the band brake. Therefore, it is not possible to increase the axial dimension of the drum, and the number of parts that can be preassembled in this drum is extremely limited.Other parts are assembled one by one after the band brake is installed, and the final In this case, it was necessary to rely on an assembly method in which a connecting shell, which surrounds the assembly of other parts, is coaxially abutted against the comb-shaped end of the drum. The above is the reason why most parts cannot be pre-assembled in conventional automatic transaxles.For this reason, conventionally, assembling parts into the transaxle case required a lot of man-hours, which hindered automation. , the assembly line became long and the parts transport equipment became complicated. The present invention retains the advantage of assembling all parts from only one end of the transaxle case, while pre-assembling most of the parts and assembling the automatic transaxle as a unit into the transaxle case, which is a large part. The aim is to solve the above problems by improving the. (Means for Solving the Problems) For this purpose, the present invention provides a gear transmission mechanism consisting of a low reverse brake, a low clutch, two planetary gear sets, a one-way clutch, a high clutch, a reverse clutch, and a band brake in a transaxle case. In a four-speed automatic transaxle device, the power input from one end of the transaxle case is shifted by the gear transmission mechanism and then taken out from the other end of the transaxle case. The low reverse brake is disposed on the inner periphery of the end, the low clutch is disposed radially inside the low reverse brake, and one of the planetary gear sets is disposed in the center of the low clutch, and the other A planetary gear set is arranged adjacent to the one planetary gear set on the side near the one end of the transaxle case, and both planetary gear sets and the low clutch are connected to the drum of the low clutch, the inner race of the one-way clutch, and the other one. The first pre-assembly is surrounded by the carrier of the other planetary gear set to enable pre-assembly, and the first pre-assembly is supported within the transaxle case via the outer race of the one-way clutch, and the first pre-assembly is surrounded by the carrier of the other planetary gear set and the sun gear. extending a clutch hub of the high clutch and a connecting shell of the reverse clutch toward the one end of the transaxle case, respectively;
said high clutch and reverse clutch are housed within said connecting shell for preassembly, said second preassembly is disposed in coaxial butting relation with said first preassembly in a unit, and said band brake is disposed within said connecting shell. Characterized by the structure wrapped around the outer circumference of the shell (function) Selective operation of the low reverse brake, low clutch, high clutch, reverse clutch, and band brake, together with the appropriate operation of the one-way clutch, creates a transmission path that passes through both planetary gear sets. is determined, and four forward speeds and one reverse speed can be selected as appropriate. By the way, in the above configuration, the low clutch and both planetary gear sets are surrounded by the low clutch drum, the inner race of the one-way clutch, and the carrier of the other planetary gear set to form the first preliminary assembly, and this is the output of the transaxle case. It fits into the inner periphery of the low reverse brake that has been placed in advance inside the side end, and is supported within the transaxle case via the outer race of the one-way clutch, and the high clutch and reverse clutch are housed within the connecting shell of the reverse clutch. This is coaxially butted against the first preparatory assembly from the side far from the closed end of the transaxle case, and the clutch hub of the high clutch and the connecting shell of the reverse clutch are respectively connected to the carrier of the other planetary gear set. It is possible to adopt an assembly procedure in which the band brake is fitted to the connecting shell and the sun gear, and the band brake is wrapped around the outer periphery of the connecting shell. Therefore, almost all the parts except the low reverse brake and the band brake can be sub-assembled as first and second pre-assemblies prior to assembly to the transaxle case. Therefore, it is possible to reduce the number of parts to be assembled to the transaxle case, thereby reducing the number of man-hours for assembling the parts, and it is also possible to automate the assembly work, and at the same time, it is possible to shorten the assembly line and simplify the parts transport equipment. Furthermore, since all of the above assembly operations are performed only from one end of the transaxle case, good workability can be maintained as before. (Example) Hereinafter, an example of the present invention will be described based on the drawings. The drawing is a developed sectional view showing one embodiment of the automatic transaxle device of the present invention, in which 1 is a transaxle case, 2 is a converter housing attached to one end of the transaxle case, and 3 is a converter housing 2.
The side covers attached to the other end of the transaxle case 1 farthest from the rear are shown. A normal lock-up torque converter 4 is housed within the converter housing 2, and this torque converter 4 includes a pump impeller (input element) 5 driven by an engine,
It is equipped with a turbine runner (output element) 6 driven by working fluid, a stator 7 as a reaction force element, and a lock-up clutch 8 that directly connects the input and output elements 5 and 6, and connects the engine power to the input shaft 9. The signal is input from one end of the transaxle case 1 (the right end in the figure) to the following gear transmission mechanism. This gear transmission mechanism includes a first planetary gear set 10 and a second planetary gear set 11 coaxially provided on an input shaft 9, a low reverse brake 12, a low clutch 13, a one-way clutch 14, a high clutch 15, and a reverse gear shift mechanism. It mainly consists of a clutch 16 and a band brake 17, which are housed inside the transaxle case 1. In the gear transmission mechanism composed of these, oil from an oil pump 18 provided on the mating surfaces of the transaxle case 1 and the converter housing 2 causes the control valve 19 in the upper part of the transaxle case 1 to move between the friction elements 12 and 13. , 15 to 17 are selectively hydraulically actuated to shift the engine power from the torque converter 4, and the shifting power is output to the output gear 20 coaxially provided with the input shaft 9, and is transferred to the transaxle far from the converter housing 2. It shall be taken out from the end of case 1. Thereafter, the power is transmitted through an idler gear 21 meshing with the output gear 20 and an idler shaft 22 parallel to the input shaft 9 to a final drive composed of a pinion 23 and a ring gear 24, and from this final drive to a differential gear 25. It is transmitted to The differential gear 25 shall be capable of distributing power to the left and right in the drawing and transmitting it to both drive wheels (two front wheels for FF vehicles, two rear wheels for RR vehicles) to drive the vehicle. . The planetary gear set 10 allows the sun gear 26 to be appropriately fixed by a band brake 17 and to be drivingly coupled to the input shaft 9 by a reverse clutch 16, and enables the planetary gear carrier 27 to be driveably coupled to the input shaft 9 by a high clutch 15, as well as a one-way clutch. 14, the internal gear 28 is connected to the transaxle case 1 rotatably in only one direction, and the internal gear 28 is connected to the planetary gear set 11.
It is coupled to the planetary gear carrier 29 of. The planetary gear set 11 has a sun gear 30 spline-coupled to the input shaft 9, a planetary gear carrier 29 spline-coupled to the output gear 20, and an internal gear 31 connected to the planetary gear set 1 by a low clutch 13.
0 planetary gear carrier 27. For this purpose, the clutch 13 is connected to its drum 3
2 to one-way clutch 14 inner race 33
A clutch pack 34 is interposed between the internal gear 31 and the drum 32, which is drivingly connected to the planetary gear carrier 27 via the clutch pack 34 and has an alternating arrangement of plates splined thereto. and,
The clutch 13 is disposed at the end of the transaxle case 1 remote from the engine, and a piston 35 for actuating the clutch 13 is fitted into the drum 32 to define a hydraulic chamber 36. The piston 35 is elastically supported by a return spring 37 in the clutch non-operating position shown in the figure, but the control valve 19
When the clutch hydraulic pressure is supplied to the chamber 36, the clutch 13 is moved to the right in the figure and is actuated. The drum 32 is rotatably supported on a bearing retainer 38, which is attached to the transaxle case 1 and also functions as a bearing support member for the output gear 20. A low reverse brake 12 is housed in the end of the transaxle case 1 remote from the engine so as to surround it on the outside in the radial direction of another low clutch 13, and this brake is driven by a drum 32 and thus an inner race 33 thereto. It is assumed that the planetary gear carrier 27 of the combined planetary gear set 10 is fixed as appropriate. For this purpose, the brake 12 is made up of a brake pack 3 in which plates are alternately arranged between the inner circumferential surface of the transaxle case 1 and the outer circumferential surface of the drum 32 and spline-fitted thereto.
9 interposed therebetween, and a brake actuation piston 40 fitted within the transaxle case 1.
The piston 40 is elastically supported in the brake non-operating position by a return spring 41, and is supplied to the chamber 42 from the control valve 19 via a brake hydraulic pressure supply path (not shown) provided in the transaxle case 1.
It is assumed that when brake hydraulic pressure is supplied to , the brake 12 is actuated by moving to the right in the figure. The planetary gear set 11 is housed in the center of the low clutch 13, and the planetary gear set 10 is arranged adjacent to the planetary gear set 11 on the side closer to the converter housing 2. Both planetary gear sets 10, 11 and the low clutch 13 are surrounded by the low clutch drum 32, the one-way clutch inner race 33, and the carrier 27 of the planetary gear set 10, and are connected to the converter housing 2 via the outer race 43 of the one-way clutch 14. Subassembly within the far end of the transaxle case 1. The reverse clutch 16 includes a connecting shell 44 that also serves as the drum of the band brake 17, and is connected to one side of the sun gear 26 by extending it toward the converter housing 2, and is rotatable on a hollow fixed shaft 45. support. A clutch drum 46 is coupled within the shell 44, and a clutch actuating piston 47 is slidably fitted therein to form a hydraulic chamber 48. drum 4
A clutch hub 49 is further housed within the clutch 6 and splined to the input shaft 9. drum 4
6 and the hub 49 are clutch packs 50 having alternating plates splined thereto.
Place. The clutch 16 is constructed as described above, but when clutch hydraulic pressure is supplied from the control valve 19 to the chamber 48 through a passage (not shown) in the transaxle case 1, the piston 47 is moved by the spring 5.
1, the plates of the clutch pack 50 are brought into frictional engagement, and the clutch 16 can be actuated. The high clutch 15 includes a clutch drum 52 connected to a hub 49, a clutch hub 53 disposed opposite to each other on the inner periphery of the clutch drum 52, and a clutch pack 54 in which splined splines are alternately arranged. A hydraulic chamber 56 is established by slidably fitting the piston 55 . The hub 53 is rotatably supported on the input shaft 9 via a hub sleeve 57 connected thereto, and is spline-coupled to the planetary gear carrier 27. The clutch 15 is constructed as described above, but when the clutch hydraulic pressure is supplied from the control valve 19 to the hydraulic chamber 56 via the passage 58, the piston 55 is moved to the left in the figure against the spring 59 and moves between the plates of the clutch pack 54. The clutch 15 can be actuated by frictional engagement. In the above embodiment, the relationship between the engagement combinations of the clutches 13 to 16 and the brakes 12 and 17 (indicated by circles) and the selected gears is as shown in the following table.

[Table] Here, the assembly procedure of the automatic transaxle in this embodiment will be explained. Low clutch 13 (including piston 35 and return spring 37) and both planetary gear sets 10, 1
1 is assembled in advance so as to be surrounded by the low clutch drum 32, the inner race 33 of the one-way clutch 14, and the carrier 27 of the planetary gear set 10,
This will be the first preassembly. Further, the high clutch 15 (including the piston 55 and the return spring 59) and the reverse clutch 16 (including the piston 47 and the return spring 51) are assembled in advance so as to be housed in the connecting shell 44 of the reverse clutch 16,
This will be the second preparatory assembly. For the transaxle case 1, first install the low lever brake 12 (piston 4
0, including the return spring 41). At this time, since the outer periphery of each plate forming the brake pack 39 of the low reverse brake 12 is spline-fitted to the transaxle case, the splines on the inner periphery are aligned with each other. In this aligned state, fit the first preliminary assembly onto the inner periphery of the low reverse brake 12 (specifically, the inner periphery of the brake pack 39), and connect the outer periphery spline of the low clutch drum 32 to the inner periphery spline of the brake pack 39. to engage. At this time, the outer race 43 of the one-way clutch 14, which has been previously assembled to the first preassembly, fits into the transaxle case 1 to support the first preassembly in the radial direction. Next, the second preparatory assembly is coaxially butted against the first preparatory assembly from the side far from the closed end of the transaxle case (the right side in the figure), and the clutch hub 53 of the high clutch 15 and the reverse clutch 1 are
6 connecting shells 44 are fitted into the carrier 27 and sun gear 26 of the planetary gear set 10, respectively. Finally, the band brake 17 is wrapped around the outer periphery of the connecting shell 44, but since this work is done at the open end of the transaxle case 1, it can be done without difficulty. As described above, before assembling almost all the parts except the low reverse brake 12 and the bandeau brake 17 to the transaxle case 1,
The first and second preassemblies can be sub-assembled. Therefore, the number of parts to be assembled to the transaxle case is small, and the number of man-hours required for parts assembly can be reduced, and the assembly work can be automated.
At the same time, it is possible to shorten the assembly line and simplify the parts transport equipment. Furthermore, since all of the above assembly operations are performed only from one end of the transaxle case near the torque converter, good workability can be maintained as before. (Effects of the Invention) Thus, in the automatic transaxle device of the present invention, as described above, almost all the parts except the low reverse brake and the band brake are sub-assembled as the first and second preliminary assemblies, and the transaxle case is assembled as a unit. However, since it has a configuration that can be assembled from only one end of the transaxle case, it maintains the advantage of assembling all parts from only one end of the transaxle case, while still being able to be assembled from a 4-speed automatic transaxle system with many components. , by realizing pre-assembly,
By reducing the number of parts to be assembled into the transaxle case, which is a large part, it is possible to reduce the number of assembly steps, shorten the assembly line, and simplify the parts transport equipment. Assembly can be reduced.

[Brief explanation of drawings]

The drawing is a developed cross-sectional view showing an example of the configuration of an automatic transaxle device according to the present invention. 1...Transaxle case, 2...Converter housing, 3...Side cover, 4...Torque converter, 9...Input shaft, 10,1
1... Planetary gear set, 12... Low reverse brake, 13... Low clutch, 14... One-way clutch, 15... High clutch, 17... Band brake, 18... Oil pump, 19... Control valve, 20... ...Output gear, 21...
Idler gear, 22...Idler shaft, 23
... Final drive pinion, 24... Final drive ring gear, 25... Differential gear, 26, 30... Sun gear, 27,
29... Planetary gear carrier, 28, 31...
...Internal gear, 32...Low clutch drum, 33...One-way clutch inner race,
43...One-way clutch outer lace, 44
... Connecting shell, 45 ... Hollow fixed shaft, 46 ... Reverse clutch drum, 49 ...
Clutch hub, 52...High clutch drum, 5
3...High clutch hub, 57...Hub sleeve.

Claims (1)

[Claims] 1. A gear transmission mechanism consisting of a low reverse brake, a low clutch, two planetary gear sets, a one-way clutch, a high clutch, a reverse clutch, and a band brake is provided in a transaxle case, and In a 4-speed automatic transaxle device in which the input power is shifted by the gear transmission mechanism and then taken out from the other end of the transaxle case, the low reverse brake is provided at the inner periphery of the other end of the transaxle case. The low clutch is disposed radially inside the low reverse brake, one of the planetary gear sets is disposed in the center of the low clutch, and the other planetary gear set is connected to the one planetary gear set. are arranged adjacent to each other on the side near the one end of the transaxle case, and both of the planetary gear sets and the low clutch are surrounded by the drum of the low clutch, the inner race of the one-way clutch, and the carrier of the other planetary gear set. The first preassembly is supported in the transaxle case via the outer race of the one-way clutch, and the carrier and sun gear of the other planetary gear set are respectively directed toward the one end of the transaxle case. extending the clutch hub of the high clutch and the connecting shell of the reverse clutch;
said high clutch and reverse clutch are housed within said connecting shell for preassembly, said second preassembly is disposed in coaxial butting relation with said first preassembly in a unit, and said band brake is disposed within said connecting shell. An automatic transaxle device characterized in that it is wrapped around the outer circumference of a shell.