JPS6212128Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to a multi-disc friction engagement device for an automatic transmission installed in a vehicle such as an automobile. For more details,
The present invention relates to a multi-disc friction engagement device for an automatic transmission that reduces the stirring resistance of lubricating oil caused by a friction engagement member. [Prior Art] Conventionally, general automatic transmissions have been equipped with planetary gears,
It has a clutch device and a brake device. As is well known, a planetary gear device consists of a sun gear, a planetary gear, and a ring gear, which are arranged in a predetermined connected state between an input shaft and an output shaft. A clutch device or a brake device is provided to control the connection state of a planetary gear device, and is often constructed of a multi-plate frictional engagement device. The multi-disc friction engagement device has a friction engagement member consisting of a clutch plate and a friction material, and when the multi-disc friction engagement device is applied to a brake device, the clutch plate of the friction engagement member and the friction One of the members is coupled to a predetermined rotating member and the other to a fixed member by claw coupling, so that they are integral in the rotational direction but movable in the axial direction. By the way, lubricating oil is forcibly supplied to these planetary gear devices and multi-plate frictional engagement devices to lubricate them. In this case, in a structure in which a multi-plate frictional engagement device is placed on the outer periphery of the planetary gear, lubricating oil is forcibly supplied from the center, and the planetary gear is first lubricated and then rotated by centrifugal force. The lubricating oil is scattered outward, and the multi-plate frictional engagement device is lubricated by the scattered lubricating oil. Lubrication of this multi-plate frictional engagement device is performed through the clutch plate and the pawl coupling gap of the friction material. After the multi-plate frictional engagement device is lubricated, the lubricating oil is returned to the oil tank. [Problems to be solved by the invention] However, as mentioned above, the lubrication of the conventional multi-plate frictional engagement device is performed through the clutch plate, which is the frictional engagement member, and the gap between the pawls of the friction material. Therefore, when this claw connection gap is small,
The return of lubricating oil to the oil tank is poor, and more lubricating oil than necessary may accumulate in the multi-plate frictional engagement device and the planetary gear device. Therefore, the resistance to agitation of the lubricating oil due to the rotation of the frictional engagement member and the planetary gear device increases, which may cause a problem of reduced transmission efficiency. Furthermore, an increase in stirring resistance may cause a problem in which the temperature of the lubricating oil rises excessively. Therefore, the problems that this invention attempts to solve are:
The objective is to reduce the stirring resistance of lubricating oil, improve transmission efficiency, and prevent excessive temperature rise of lubricating oil. [Means for Solving the Problems] The present invention attempts to solve the above-mentioned problems by actively providing a lubricating passage in the pawl joint between the frictional engagement member and the fixing member. Specifically, the present invention provides a multi-disc friction engagement device for a conventional general automatic transmission as described above, in which the pawls of the pawl connecting portions at the lower positions of the frictional engagement member and the fixed member are cut out, and a lubricating passage is formed. Take measures to form a [Operation] By taking the above-mentioned means, the present invention allows a part of the lubricating oil that lubricates the multi-plate frictional engagement device to pass through the lubricating passage provided by cutting out the pawl of the pawl joint and into the oil tank. be returned. Therefore, lubricating oil does not accumulate in the multi-plate frictional engagement device more than necessary. [Example] Hereinafter, an example of the present invention will be described based on the drawings. FIG. 3 is a skeleton diagram showing an example of an automatic transmission to which the present invention is applied. Note that this automatic transmission has four forward speeds and one reverse speed. In FIG. 3, an automatic transmission is indicated generally at 10. The automatic transmission 10 includes a torque converter 20 and a gear transmission 30. As is well known, the torque converter 20 includes a pump impeller 22, a turbine impeller 24, and a stator impeller 26. The pump impeller 22 is connected to the output shaft 14 from the engine, and the turbine impeller 24 is connected to the input shaft 16 of the gear transmission 30. Then, as the oil circulates within the torque converter 20 and a power transmission action is performed, the rotational power of the output shaft 14 from the engine is
Torque is increased and transmitted to the input shaft 16 of the gear transmission 30. The gear transmission 30 has an input shaft 16 and an output shaft 18.
Three sets of planetary gear devices 4 from the first to the third
0, 50, 60, three sets of first to third clutch devices 70, 72, 74, three sets of first to third clutch devices 80, 82, 84, and two sets of one-way clutch devices 86. , 88 are provided. Each of the first to third planetary gear devices 40, 50, 6
0 is configured in a so-called single planetary gear format. Now, to explain the first planetary gear device 40 as an example, it is composed of a sun gear 42, a planetary gear 44, and a ring gear 46.
The planetary gear 44 is rotatably supported by a carrier 48. The connection state of the gear transmission 30 is as follows. The input shaft 16 is connected to a carrier 48 of a first planetary gear set 40 . The carrier 48 and the sun gear 42 are coupled via a first clutch device 70 and a first one-way clutch device 86.
Further, a first brake device 80 is provided between the sun gear 42 and the transmission case 12. Note that the ring gear 46 is connected to the first intermediate shaft 9
0 to a second clutch device 72 and a third clutch device 74. The sun gears 52 and 62 of the second planetary gear device 50 and the third planetary gear device 60 are connected to the third intermediate shaft 94
A second brake device 82 is connected to the third clutch device 74 via the transmission case 12 and is provided with a second brake device 82 between the transmission case 12 and the transmission case 12 . The ring gear 66 of the third planetary gear set 60 is connected to a second clutch arrangement 72 via a second intermediate shaft 92 . The carrier 58 supporting the planetary gear 54 of the second planetary gear set 50 is provided with a third brake device 84 and a second one-way clutch device 88 between it and the transmission case 12 . A carrier 68 that supports the ring gear 56 of the second planetary gear set 50 and the planetary gear 64 of the third planetary gear set 60 is connected to the output shaft 18. The gear transmission 30 configured in the above-mentioned connected state is
As shown in Table 1, each clutch device 70, 72, 7
4. By selectively controlling each brake device 80, 82, 84 and each one-way clutch device 86, 88, four forward speeds and one reverse speed can be obtained. In addition, in Table 1, each clutch device 7
0, 72, 74, each brake device 80, 82, 8
4. Each one-way clutch device 86, 88 is designated by the reference numeral shown in FIG. Further, in Table 1, the mark ◯ indicates the operating state, and the mark x indicates the non-operating state.

[Effect of idea]

As detailed above, according to the present invention, the lubricating oil does not accumulate in the multi-plate frictional engagement device more than necessary, so unlike the conventional method, the resistance to agitation of the lubricating oil by the frictional engagement member increases. There's nothing to do.
Therefore, the transmission efficiency is improved compared to the conventional technology, and excessive temperature rise of the lubricating oil can be prevented.

[Brief explanation of the drawing]

1 and 2 show the main structural parts of the embodiment according to the present invention, FIG. 1 is a side cross-sectional view showing the detailed structure of the pawl connection of the clutch plate, and FIG. FIG. 3 is a skeleton diagram showing an example of an automatic transmission to which the present invention is applied, and FIG. 4 is a hydraulic circuit diagram of the automatic transmission. Explanation of symbols, 10... Automatic transmission, 12... Transmission case, 130... Rotating member,
132...Friction engagement member, 134...Clutch plate, 134a...Clutch plate pawl, 1
36...Friction material, 138...Hub part, 138a...
...Claw on the hub, 140...Lubrication passage.

Claims (1)

[Scope of Claim for Utility Model Registration] A frictional engagement member consisting of a clutch plate and a friction material is disposed between a predetermined rotating member of an automatic transmission and a fixed member such as a transmission case. automatic transmission in which one of the clutch plate and friction material of the frictional engagement member is connected to the rotating member and the other to the stationary member, each integrally connected in the rotational direction but movable in the axial direction by claw coupling. A multi-plate friction engagement device for an automatic transmission, characterized in that a pawl of a pawl coupling portion located below the frictional engagement member and the fixing member is cut out to form a lubrication passage. Engagement device.