JPH0582507B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic transmission used by being inserted into a power transmission system of an automobile.

(Prior Art) Automatic transmissions are generally configured to perform automatic gear changes under the appropriate action of a one-way clutch by selectively operating various friction elements such as clutches and brakes to switch power transmission paths.

By the way, in automatic transmissions, due to the structure of the gear train, a certain rotating body can only be rotated in one direction via a one-way clutch, and can be fixed to the transmission case (transmission case) as appropriate using a multi-disc brake. There may be times when it is necessary to do so. In this case, the one-way clutch has a fixed race (usually an outer race) attached to the transmission case, and a rotating race (usually an inner race) to the above-mentioned rotating body, and a multi-disc brake has its hub attached to the above-mentioned certain rotating body. It is customary to combine it with other parts that are integrated into the same body.

However, in such a configuration, the above-mentioned separate parts are additionally required, and the number of parts is large, making it difficult to assemble the automatic transmission.In addition, installation space and rotation space for the separate parts must be secured, which makes it difficult to assemble the automatic transmission. This leads to an increase in size.

Therefore, as described in Japanese Patent Application Laid-Open No. 58-21044, when the above-mentioned certain rotating body is connected to the hub of the above-mentioned multi-disc brake, the rotation of a one-way clutch that is integrally molded or integrally connected to the certain rotating body is conventionally known. A technique has been proposed that uses lace to eliminate the need for the above-mentioned separate parts. In this prior art, the rotary race is also integrally molded or integrally connected to the hub of the multi-disc brake.

(Problem to be Solved by the Invention) However, the above-mentioned rotating body constitutes a rotating member of a planetary gear set, and the rotating race of a one-way clutch is connected to the hub of a multi-disk boot as in the past. However, in a configuration in which a rotating body, a one-way rotating race, and a multi-plate brake hub are inserted and assembled in the axial direction, splines must be installed in the transmission case in advance. The spline fitting work of the hub to the disk group of the multi-disc brake that has been fitted, and the work of fitting the corresponding gear element (a certain rotation It becomes necessary to carry out the gear meshing work (already installed on the body) at the same time.

For this reason, since the spline grooves between all the brake discs that make up a multi-disc brake disc group must be aligned, the former spline fitting work, which is difficult to do alone, is increasingly being performed by the latter gear meshing work. This makes it difficult to assemble the automatic transmission, and greatly deteriorates the workability of assembling the automatic transmission.

In order to solve this problem, after assembling the disk group, first insert the above-mentioned integral part and complete the above-mentioned gear meshing work, then sequentially install the brake disks in the annular space between the hub and transmission case. It is conceivable to adopt an assembly order in which the brake discs are inserted one by one in the axial direction and spline-fitted to the hub and transmission case, but in this case, the labor-intensive work of spline-fitting the brake discs one by one is required. This further impairs assembly workability.

The object of the present invention is to solve the above-mentioned problems by integrating the rotating race of a one-way clutch only with respect to a certain rotating body and making it separable with respect to the hub of a multi-disc brake.

(Means for Solving the Problems) For this purpose, the present invention makes it possible to rotate a certain rotating body in only one direction via a one-way clutch, and uses multi-disc brakes installed coaxially side by side on the one-way clutch as appropriate. In an automatic transmission which can be fixed to a transmission case and also can be appropriately connected to other rotating bodies by a multi-disc clutch disposed coaxially on the inner circumferential side of the multi-disc brake, the hub of the multi-disc brake and the above-mentioned A rotating drum that also serves as a clutch drum of a multi-disc clutch is disposed between the multi-disc brake and the multi-disc clutch, the certain rotating body is connected to the rotating race of the one-way clutch, and a rotating drum is attached to the inner periphery of the drum. An outer circumferential protrusion that rotationally engages with a spline formed for rotationally engaging the clutch plate of the clutch is integrally molded on the rotating race, and the rotating race is configured to engage the rotating drum with the spline. .

(Function) In an automatic transmission, a one-way clutch allows a rotating body to rotate in only one direction, and the rotating body is fixed to the transmission case using a multi-disc brake, or rotated to another rotating body using a multi-disc brake. A predetermined gear stage can be selected by appropriately coupling the gear position to the gear position.

By the way, when a certain rotating body is connected to the hub of a multi-disc brake and the clutch drum of a multi-disc clutch, the rotating body is connected to the rotating race of the one-way clutch, and the outer circumferential protrusion integrally formed on this rotating race is Since the structure is such that it engages with the existing inner circumferential spline of the rotating drum that serves both as the hub of the multi-disc brake and the clutch drum of the multi-disc clutch, the rotating race of the one-way clutch is used for the above connection. No separate parts are required for this connection.

Therefore, the assembly workability of the automatic transmission can be improved by reducing the number of parts, and there is no need to secure the arrangement space and rotation space for the above-mentioned separate parts, so that the automatic transmission can be made more compact.

In particular, since the rotating race of the one-way clutch is splined to the rotating drum,
The heavy preassemblies associated with the rotating race can be disassembled from this rotating drum, and the rotating drum can be axially oscillated while the rotating drum is being rotated without having to previously spline align the multiple brake discs of the multi-disc brake with one another. By simply inserting the brake disc into the brake disc, spline alignment of all brake discs can be completed, and assembly work efficiency can be improved.

Furthermore, when spline-engaging the rotating race of the one-way clutch to the rotating drum, the existing internal splines of the drum are utilized, so there is no need to specially form splines on the rotating drum for such engagement. This is highly advantageous in terms of cost.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2 show the main parts of the automatic transmission of the present invention. In FIG. 1, 1 is a transmission case, 2 is a side cover that closes the open end far from the engine, and 3 is a transmission case. 4 is an input shaft, 4 is an output gear coaxially rotatable with respect to the input shaft 3, and 5 and 6 are planetary gear sets coaxially provided on the input shaft 3, respectively.

In the planetary gear set 5, the sun gear 7 is appropriately fixed by a band brake (not shown), and the planetary gear carrier 8 can be appropriately connected to the input shaft 3 by a clutch (not shown), and is connected to the transmission case 1 via a one-way clutch 9. , the internal gear 10 is coupled to the planetary gear carrier 11 of the planetary gear set 6. The planetary gear set 6 has a sun gear 12 spline-coupled to the input shaft 3, a planetary gear carrier 11 spline-coupled to the output gear 4, and an internal gear 1.
3 can be connected to the planetary gear carrier 8 of the planetary gear set 5 by means of a clutch 14.

For this purpose, the clutch 14 drivingly connects its rotating drum 15 to a planetary gear carrier 8 via an inner race 16 of the one-way clutch 9, and a plate splined between the internal gear 13 and the drum 15. A clutch pack 17 consisting of alternating arrangement of 17a and 17b and a further spring 17c is interposed. The clutch 14 is disposed at an end of the transmission case 1 remote from the engine, and a piston 18 for actuating the clutch is fitted into a drum 15 to define a hydraulic chamber 19. The piston 18 is elastically supported by a return spring 20 at the clutch non-operating position shown in the figure. And drum 15
is rotatably supported on a bearing retainer 21, which is attached to the transmission case 1 and also functions as a bearing support member for the output gear 4.

Transmission case 1 far from the engine
A multi-disc brake 22 is housed in the end of the clutch 14 on the outside in the radial direction so as to surround it. The planetary gear carrier 8 of the planetary gear set 5 connected for driving is fixed as appropriate. For this purpose, the brake 22 is provided with a plate 23 fitted between the inner circumferential surface of the transmission case 1 and the outer circumferential surface of the drum 15 and spline-fitted thereto.
A brake pack 23 is interposed therebetween, consisting of an alternating arrangement of elements a and 23b, a spring 23c, and a retaining plate 23d, and a brake working piston 24 fitted in the transmission case 1. The piston 24 is elastically supported by a return spring 25 in the brake non-operating position, and when brake hydraulic pressure is supplied from the control valve 26 to the chamber 27 via a brake hydraulic pressure supply path (not shown) provided in the transmission case 1. It is assumed that the brake 22 is actuated by moving to the right in Figure 1.

The control valve 26 is provided at the upper part of the transmission case 1 so as to close its opening, and the control valve is covered with a cover 28 attached to the upper surface of the transmission case 1.

29 is the upper open end of the clutch hydraulic pressure supply path to the clutch 14, to which the control valve 2 is connected.
Connect the corresponding ports of 6. The upper open end 29, together with the casting hole 30 (closed with a gasket 31) of the transmission case 1, the holes 32, 33, the grooves 34, and the port 35, constitutes a clutch hydraulic pressure supply path leading to the chamber 19, and then the control valve. 2
When clutch oil pressure from 6 is supplied to chamber 19,
The piston 18 moves to the right in FIG. 1 relative to the spring 20,
Clutch 14 can be actuated.

In the present invention, the planetary gear carrier 8 is connected to the rotating drum 1 of the clutch 14 which is also the hub of the multi-disc brake 22 via the inner race 16 which is the rotating race of the one-way clutch 9.
5, but the carrier 8 is connected to the inner race 16
This is done by welding 36. As a matter of course, the outer race 37, which is a fixed race of the one-way clutch 9, is non-rotatably attached to the transmission case 1, so that the one-way clutch 9 can only rotate the planetary gear carrier 8 in one direction, and cannot rotate it in the opposite direction. Make it unrotatable.

The rotating drum (multi-plate brake hub) 15 has a second
As clearly shown in the figure, inner splines 15a and outer splines 15b are formed alternately on the inner and outer peripheries thereof, and extend in the axial direction, for example, by roll forming.
The outer peripheral protrusion 1 of the plate 17b is attached to the spline 15a.
7b' into the drum 15 by engaging the plate 17b'.
are spline-fitted, and the spline 15b is engaged with the inner circumferential protrusion 23b' of the plate 23b.
A plate 23b is spline-fitted to the outer periphery of 5. The spline 15a further includes an inner race 16.
The outer peripheral protrusion 16a of the inner race 16 is engaged with the inner race 16, thereby making use of the spline 15a to connect the inner race 16 to the drum (multi-disc brake hub) 15 in a removable manner. In addition, the outer peripheral spline 15b
As shown in FIG. 1, a stepped portion 15c is set so as to end before the open end of the drum 15, and the inner race 16 is abutted against this step, and the inner race 15c is secured to the inner race 15c by a snap ring 38 that is engaged within the open end of the drum 15. The inner race 16 is positioned in the axial direction by preventing the race 16 from coming off.

The clutch pack 17 is interposed between the piston 18 and the inner race 16, and the inner race 16 also functions as a retaining plate that determines the movement position of the clutch pack 17 in the right direction in FIG. 1 when the clutch 14 is operated. let

In the embodiment described above, when the clutch 14 is activated, the clutch 14 drives the planetary gear carrier 8 to the internal gear 13 and causes them to rotate together, but the one-way clutch 9 allows this rotation only in one direction. Then, when the brake 22 is operated as described above with the clutch 14 in the non-operated state,
This brake can fix the planetary gear carrier 8 non-rotatably through the drum 15 and inner race 16.

In the above embodiment, the multi-plate brake 22 and the planetary gear set 5 can be assembled as follows.

That is, the brake pack 23 of the multi-disc brake 22 is first spline-fitted into the transmission case 1 in advance. Next, the drum (hub of the multi-disc brake 22) 15 is inserted from the right side in FIG. 1 to the left side in the axial direction in a state before the one-way clutch rotating race 16 is assembled. If the drum 15 is inserted while vibrating in the rotational direction during this insertion, the outer circumferential spline 15b engages with the inner circumferential spline of the brake disk 23b forming the brake pack 23, and all the disks 23b are sequentially spline aligned, and the drum 15 is inserted. It can be completed.
Therefore, before inserting the drum 15, the disk 23
There is no need to align b with splines in advance,
Workability can be improved.

Note that the vibration in the rotational direction when the drum 15 is inserted is that the drum 15 is in an independent state separated from the one-way clutch rotating race 16 at this time.
This is possible because there is no need to worry about the meshing between the planetary pinion gear of the planetary gear set 5 and the internal gear 10.

Next, the clutch pack 17 and the like will be assembled, but since these are not related to the present invention, their explanation will be omitted, and the subsequent final assembly method of the planetary gear set 5 will be explained. At the same time, the one-way clutch rotation race 16 is rotationally engaged with the inner peripheral spline groove 15a from the open end of the drum 15 inserted as described above, and at the same time, the planetary pinion gear of the planetary gear set 5 already assembled is connected to the rotation race. The rotating race 16 is meshed with the gear 10, and finally the rotating race 16 is prevented from coming off by the snap spring 38. At this time, two operations are performed at the same time, but the former rotational engagement operation of the rotary race 16 is not composed of multiple parts like a brake pack, but is composed of a single component, and the above-mentioned engagement operation is performed at the same time. It can be carried out without difficulty even at the same time.

(Effects of the Invention) Thus, the present invention enables a certain rotating body (in the illustrated example, the planetary gear carrier 8) to rotate only in one direction via the one-way clutch 9, and also makes it possible to rotate a rotating body (in the illustrated example, the planetary gear carrier 8) only in one direction, and to rotate the rotary body (planetary gear carrier 8 in the illustrated example) only in one direction. In addition to being able to be fixed to the transmission case 1 as appropriate with the plate brake 22, the multi-disc clutch 14 coaxially arranged on the inner circumferential side of the multi-disc brake can be attached to other rotating bodies (in the illustrated example, the internal gear 13) as appropriate. In an automatic transmission that can be coupled, the hub of the multi-disc brake 22 and the multi-disc clutch 1
Rotating drum 15 that also serves as the clutch drum of No. 4
is arranged between the multi-hole brake and the multi-plate clutch, the certain rotating body is tied to the rotating race 16 of the one-way clutch 9, and the clutch plate 17b of the clutch 14 is rotatably engaged with the inner periphery of the drum 15. An outer peripheral protrusion 16a that rotationally engages with a spline 15a formed for mating is integrally molded on the rotating race 16 of the one-way clutch, and this rotating race is attached to the rotating drum 15.
Since the rotating body 8 is connected to the hub of the multi-disc brake 22 and the clutch drum of the multi-disc clutch 14, the rotating race 16 of the one-way clutch 9 is used. , no separate parts are required for this connection.

Therefore, the assembly workability of the automatic transmission can be improved by reducing the number of parts, and the automatic transmission can be made more compact since there is no need to secure the arrangement space and rotation space for the above-mentioned separate parts.

In particular, since the rotating race 16 of the one-way clutch 9 is splined to the rotating drum 15, heavy pre-assembly parts associated with the rotating race 16 can be disassembled from the rotating drum 15, and the multi-disc brake 22 can be disassembled from the rotating drum 15. Even if a large number of brake disks 23a, 23b are not spline aligned with each other in advance, spline alignment of all brake disks can be completed simply by inserting the rotary drum 15 in the axial direction while rotating and vibrating it. Assembly workability can be improved.

Furthermore, the rotating race 16 of the one-way clutch 9
When the spline is engaged with the rotating drum 15, the existing inner peripheral spline 15a of the drum is used, so there is no need to specially form a spline on the rotating drum 15 for such engagement, which is very advantageous in terms of cost. It is.

[Brief explanation of drawings]

Figure 1 is a sectional view of the main parts of the automatic transmission of the present invention, Figure 2
The figure is a - sectional view of FIG. 1. 1...Transmission case (transmission case), 2...Side cover, 3...Input shaft,
4... Output gear, 5, 6... Planetary gear set, 7...
Sun gear, 8... Planetary gear carrier (a certain rotating body), 9... One-way clutch, 10...
Internal gear, 11...Planetary gear carrier, 12...Sun gear, 13...Internal gear, 14...Clutch, 15...Same rotating drum (multi-plate brake hub), 15a...Inner circumference spline, 15b... Outer circumference spline, 16... Inner race (one-way clutch rotating race), 17
...Clutch pack, 18...Clutch operating piston, 21...Bearing retainer, 22...Multi-disc brake, 23...Brake pack, 24...
Brake operating piston, 26...Control valve, 36...Welding, 37...Outer race (fixed race).

Claims (1)

[Scope of Claims] 1. A rotating body can be rotated in only one direction via a one-way clutch, and can be fixed to a transmission case as appropriate by a multi-disc brake installed coaxially side by side with the one-way clutch. In an automatic transmission that can be appropriately connected to other rotating bodies by a multi-disc clutch disposed coaxially on the inner circumferential side of the multi-disc brake, a rotating shaft that serves both as a hub of the multi-disc brake and as a clutch drum of the multi-disc clutch. A drum is disposed between the multi-disc brake and the multi-disc clutch, the certain rotating body is coupled to the rotating race of the one-way clutch, and a clutch plate of the clutch is rotationally engaged with the inner periphery of the drum. An automatic transmission characterized in that an outer circumferential protrusion that rotationally engages with a spline formed for the rotation is integrally molded on the rotary race, and the rotary race is spline-engaged with the rotary drum.