JP3816281B2 - Air breather chamber structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of an air breather chamber provided in a transmission.
[0002]
[Prior art]
Inside the transmission, the internal gas volume changes due to changes in pressure or temperature of the working fluid. Therefore, a pipe line generally referred to as an air breather pipe is attached to communicate with the outside to absorb the volume change of the gas. However, if the air breather pipe is directly attached to the case member of the transmission, the working fluid may flow out of the air breather tube. Therefore, generally, a gas housing called an air breather chamber is provided above the case member of the transmission. A chamber is provided, and an air breather pipe is connected to the uppermost part of the air breather chamber so that the internal fluid does not flow into the air breather pipe.
[0003]
As such an air breather chamber structure, there are those described in, for example, Japanese Patent Application Laid-Open No. 56-113858 and Japanese Utility Model Laid-Open No. 4-136349. Among these, the former particularly relates to an air breather chamber structure of a main transmission that controls normal shifting and a sub-transmission that controls switching between two-wheel and four-wheel drive, and one of several case members includes an air breather. A chamber is formed, and from all cases, a gas passage is provided but a fluid passage is difficult to pass through so as to communicate with the air breather chamber. In the latter case, a baffle plate is erected at the upper corner of the case to form a simple air breather chamber, and an air breather tube is connected thereto.
[0004]
[Problems to be solved by the invention]
However, all of the conventional air breather chamber structures make it difficult for the working fluid to pass through gaps or small holes. In other words, since the air breather chamber is originally a part where the fluid does not want to enter, in that sense, in the conventional air breather chamber structure, the working fluid is practically easy to enter the air breather chamber. It is difficult to get out of the air breather room.
[0005]
The present invention has been developed in view of these problems, and an object of the present invention is to provide an air breather chamber structure in which a foam-like working fluid is unlikely to enter, and at the same time, the working fluid easily flows out.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the air breather chamber structure according to claim 1 of the present invention is an air breather chamber structure in which a recess is formed in an inner upper portion of a case member of a transmission to form an air breather chamber. The air breather chamber is disposed in any one of the rotating shaft directions of the rotating body with respect to the rotating body in the case member, and the bottom surface of the air breather chamber and the rotating shaft of the rotating body Is smaller than the outer diameter of the rotator, and a small diameter hole is formed in a portion close to the rotator in the case member of the plate member that fits into the dent and covers the dent, and is far from the rotator. A large-diameter hole is formed in the portion , and a line segment connecting the small-diameter hole and the large-diameter hole is parallel or substantially parallel to the rotation axis of the rotating body .
[0007]
Further, the air breather chamber structure according to claim 2 of the present invention is characterized in that a seal member is attached to the entire peripheral edge of the plate material that fits into the recess and covers the recess. is there.
According to a third aspect of the present invention, the air breather chamber structure is characterized in that the seal member has a lip that faces the inner side of the case member and contacts the case member .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which an air breather chamber structure of the present invention is developed in a toroidal type continuously variable transmission will be described with reference to the accompanying drawings.
First, the schematic configuration of the toroidal type continuously variable transmission according to the present embodiment will be briefly described in the order from the input side to the output side with reference to FIG. The rotational force of the engine, not shown, is input to the input shaft 2 via the torque converter 4 in the mission case 1. A CVT shaft 3 is coaxially arranged as a power transmission rotating shaft on the right side of the input shaft 2 in the figure. An oil pump 5 is attached to the input shaft 2, and a forward clutch mechanism for switching an input rotation direction to the CVT shaft 3 by switching a fixed element of the planetary gear mechanism 8 on the right side of the oil pump 5 in the figure. 6, a forward / reverse switching mechanism 9 having a reverse clutch mechanism 7 is provided. The CVT shaft 3 is provided with two toroid-like cavities, that is, first and second toroidal speed change mechanisms 10 and 11 that constitute a groove portion and are separated from each other in the axial direction. The torque converter 4 has a so-called lock-up mechanism.
[0009]
Between the input shaft 2 and the CVT shaft 3, a sun gear 13 that is rotatably supported by the input shaft 2 via a needle bearing 12 and constitutes the planetary gear mechanism 8 of the forward / reverse switching mechanism 9, and the sun gear 13 A loading cam 14 that engages with the claw portion 13a formed on the CVT shaft 3 and is rotatably supported by the CVT shaft 3, and is connected to the loading cam 14 via an engagement roller 15 and is connected to the CVT shaft 3 by a ball spline 16 And an input disk 17 supported via the. The engagement roller 15 is rotatably held by a cage 41. Accordingly, the rotational force transmitted from the engine to the input shaft 2 is sequentially applied from the claw portion 13a of the sun gear 13 to the loading cam 14, the engaging roller 15, the input disk 17, and the ball spline 16 via the forward / reverse switching mechanism 9. It is transmitted to the CVT shaft 13 via.
[0010]
The contact surfaces of the loading cam 14 and the input disk 17 with the engaging roller 15 are opposite to each other, and a cam surface that gradually increases in the thrust direction is formed. The thrust in the axial direction of the CVT shaft 3 for torque transmission that is proportional to the input torque, that is, a thrust force is generated by moving along. In addition, a disc spring 42 is provided between the loading cam 14 serving as the input cam and the input disk 17 serving as the output cam to apply a force in a direction in which both are separated from each other and to apply a preload. . Further, by supplying a predetermined fluid pressure between the loading cam 14 and the input disk 17, the thrust in the axial direction, that is, the thrust force can be adjusted. The loading cam 14 is rotatably supported on the CVT shaft 3 by a ball bearing 44.
[0011]
The first and second toroidal transmission mechanisms 10 and 11 will be described first. The first toroidal transmission mechanism 10 has the toroidal surface 17a formed on the surface opposite to the surface in contact with the engagement roller 15. 17, a toroidal surface 18 a is formed on the opposing surface of the input disk 17, and an output disk 18 rotatably supported by the CVT shaft 3, which forms a first cavity with two toroidal surfaces, and the input disk 17 And a power roller (friction roller) 29 that comes into contact with the cavity in a tiltable manner. The power roller 29 is supported in a tiltable manner by a support mechanism called a trunnion. By operating the trunnion with a fluid pressure cylinder that is servo-operated by a step motor, the power roller 29, the input disk 17 and the output are output. The rotational speed ratio, that is, the gear ratio between the input disk 17 and the output disk 18 can be continuously changed by changing the respective radial contact positions, ie, contact radii, with the disk 18. .
[0012]
The second toroidal speed change mechanism 11 includes an input disk 19, an output disk 20, a power roller (friction roller) 30, a support mechanism, and a fluid pressure drive device as in the case of the first toroidal speed change mechanism 10, but a CVT shaft. 3 is disposed on the side farther from the first toroidal transmission mechanism 10 and the output disk 20 is disposed on the side closer to the first toroidal transmission mechanism 10. ing. That is, the first toroidal transmission mechanism 10 and the second toroidal transmission mechanism 11 are configured to be line symmetric in the drawing. A roller bearing 38 is provided between the output disk 18 of the first toroidal transmission mechanism 10 and the CVT shaft 3, and a roller bearing 39 is provided between the output disk 20 of the second toroidal transmission mechanism 11 and the CVT shaft 3. It is intervened.
[0013]
An output composite gear 22 is disposed between the back surfaces of the output disks 18 and 20 facing each other, and cylindrical shaft portions 18b and 20b protruding in the axial direction from both ends of the center of the output composite gear 22 are provided. The output disks 18 and 20 are splined to them. The output composite gear 22 is rotatably supported via a bearing 24 on gear housings 23 a and 23 b fixed to the inner peripheral wall of the transmission case 1. The output composite gear 22 meshes with a driven gear 25, and this driven gear 25 is rotatably supported by the gear housing 23b via a bearing 26. One end of the countershaft 27 is splined to the center of the driven gear 25, and the other end of the countershaft 27 is rotatably supported by the transmission case 1 via a roller bearing 35. Are designed to rotate together. Therefore, the rotational force from the engine transmitted to the CVT shaft 3 is disassembled into the input disks 17 and 19 of the first and second toroidal transmission mechanisms 10 and 11, and the tilting operation of the power rollers 29 and 30 described above is performed. Is transmitted to the output disks 18 and 20 of the toroidal transmission mechanisms 10 and 11 at a predetermined speed ratio, and then synthesized by the output synthesis gear 22 and output via the driven gear 25, the countershaft 27 and the gear train 28 in order. Is transmitted to the shaft 33. A disc spring 43 is interposed on the back surface of the input disk 19 of the second toroidal transmission mechanism 11. By adjusting the tightening torque of the nut 40 screwed to the output side of the disc disc 42, It is possible to adjust the preload state of the thrust force generated between the two. A reverse sensor for switching the valve is attached to the end of the countershaft 27 on the driven gear 25 side.
[0014]
The gear train 28 includes a counter output gear 31 formed at the other end of the counter shaft 27, an idler gear to be described later meshing with the counter output gear 31, and an end of the output shaft 33 on the CVT shaft 3 side. And an output gear 32 formed in the section. The gear train 28 and the output shaft 33 are accommodated in an extension case 34 joined to the rear end portion of the transmission case 1. Further, the rear end portion of the counter shaft 27, that is, both sides of the counter output gear 31, is a roller interposed between the roller case 35 and the extension case 34 interposed between the transmission case 1 side and the roller. The bearing 36 is rotatably supported. Further, the output shaft 33 has a roller bearing 38 interposed between the output gear 32 side and a rear joint surface portion 37 provided on the rear surface portion of the transmission case 1, and the rear end portion of the CVT shaft 3. An output end side, that is, a rear end side thereof is rotatably supported by a roller bearing 45 interposed between the extension case 34 and the needle bearing 39 interposed therebetween. In the figure, reference numeral 46 is a parking gear splined to the output shaft 33, reference numeral 47 is a speedometer gear formed on the output shaft 33, and reference numeral 48 is an air formed between the extension case 34 and air. The breather chamber 49 is a nut for positioning the output shaft 33.
[0015]
FIG. 2 shows a front joint surface of the extension case 34. As is clear from the figure, the air breather chamber 48 is provided with a depression formed at the uppermost part on the front joint surface side of the extension case 34. An air breather tube (not shown) is connected to the outside of the air breather chamber 48 of the extension case 34, and the gas volume change in the air breather chamber 48 is released to the outside through the air breather tube. Further, since the parking gear 46 and the output gear 32 having a large outer diameter are arranged in front of the air breather chamber 48 in the drawing, the vehicle front end surface 34a of the air breather chamber 48 is flat. The air breather chamber 48 is partitioned from the inside of the transmission case 1 or the extension case 34 by a partition member 50 processed from a sheet metal. Actually, a gas and a bubble-like fluid can be reciprocated by a hole described later, but a working fluid such as lubricating oil hardly penetrates.
[0016]
As shown in FIG. 3, the partition member 50 is attached to a vehicle front end surface 34a of the air breather chamber 48 so as to close the vehicle front opening of the air breather chamber 48, and is bent at a right angle therefrom. And a plate member 52 which is fitted into and covers the lower opening of the air breather chamber 48. Of these, the mounting portion 50a is formed in a shape that is in close contact with the vehicle front end surface 34a of the air breather chamber 48 and does not protrude therefrom, and bolts 51 are inserted into both ends in the vehicle width direction. A through hole 51 a is formed, and a bolt 51 is inserted into the through hole 51 a and screwed into a screw hole of the extension case 34 and tightened to fix the partition member 50 to the extension case 34.
[0017]
Further, the plate member 52 is curved outwardly in a convex shape in accordance with the shape of the inner surface of the extension case 34 in which the air breather chamber 48 is formed, but as a whole, the corner portion is rounded. It is a square. In the plate member 52, a small-diameter hole 55 having a small diameter is formed in front of the vehicle on the right side of the vehicle, and a large-diameter hole 54 having a slightly larger diameter is formed in the rear of the vehicle. Through these two holes 54 and 55, the breathing of the gas in the mission case 1 and the extension case 34, that is, the flow of the gas by the change in the gas volume similar to the respiratory activity, is carried out. This toroidal type continuously variable transmission Then, since the parking gear 46 and the output gear 32 have large outer diameters and are higher than the air breather chamber 48, the flow of lubricating oil scattered from the front to the rear of the vehicle is near the air breather chamber 48. Since the scattered lubricating oil is foamy, the foamed lubricating oil is once taken into the air breather chamber 48 from the small-diameter hole 55 and separated into gas and liquid lubricating oil inside. The lubricating oil itself is returned from the body hole 54 into the extension case 34 while breathing only the gas. That. In addition, by doing so, it is possible to prevent and prevent the foam of the lubricating oil from diffusing inside the case.
[0018]
On the other hand, a sealing member 53 with a lip is attached to the peripheral edge of the plate member 52 facing the peripheral wall of the air breather chamber 48 over the entire circumference. As clearly shown in FIG. 4, the seal member 53 has the lip 56 facing downward, that is, toward the inside of the transmission case 1 and the extension case 34. Therefore, the fluid in the case member passes over the seal member 53 and the air breather. It is difficult to enter the chamber 48, and the fluid in the air breather chamber 48 can easily exit. That is, the seal member 53 has a characteristic that the fluid does not easily enter the air breather chamber 48 and the fluid easily flows out from the air breather chamber 48. Therefore, for example, even when a large amount of lubricant is scattered and the air breather chamber 48 is immersed in the lubricant, the seal member 53 makes it difficult for the lubricant to enter the air breather chamber 48. Even if the lubricating oil enters the air breather chamber 48, it easily flows out, so that the fluid in the case member does not flow out into the air breather tube.
[0019]
【The invention's effect】
As described above, according to the air breather chamber structure according to claim 1 of the present invention, among the plate members that are fitted in the air breather chamber consisting of the recess in the inner upper part of the case member and block the recess. A small-diameter hole is formed in a part close to the body, a bubble-like fluid scattered from the rotating body is once taken into the air breather chamber, gas and fluid are separated, and a part of the plate material far from the rotating body Since only the fluid is returned from the large-diameter hole formed in the case member, the bubbles can be prevented from diffusing into the case member.
[0020]
Moreover, according to the air breather chamber structure which concerns on Claim 2 among this invention, the peripheral part which faces the said hollow of the board | plate material which fits in the air breather chamber which consists of a hollow of the inner upper part of a case member, and obstruct | occludes the said hollow By attaching the seal member to the whole, the intrusion of the working fluid when the air breather chamber is immersed in the working fluid is suppressed and prevented, and the invading working fluid can easily flow out of the sealing member. it can.
In the air breather chamber structure according to the third aspect of the present invention, the fluid in the case member is unlikely to enter the air breather chamber beyond the seal member, and the fluid in the air breather chamber can easily come out.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of a toroidal continuously variable transmission.
2 is an explanatory diagram of an air breather chamber of the toroidal type continuously variable transmission of FIG. 1, showing a front joint surface of an extension case.
3 is an explanatory view of a partition member that partitions the air breather chamber of FIG. 2, (a) is a plan view, and (b) is a front view. FIG.
4 is a detailed view of a seal member disposed between a peripheral wall of the air breather chamber of FIG. 2 and a plate member portion of a partition member.
[Explanation of symbols]
1 is a transmission case 2 is an input shaft 3 is a CVT shaft 4 is a torque converter 9 is a forward / reverse switching mechanism 10 is a first toroidal transmission mechanism 11 is a second toroidal transmission mechanism 17, 19 is an input disk 18, and 20 is an output disk 22. Output composite gears 29 and 30 are power rollers (friction rollers)
31 is a counter output gear 32 is an output gear 33 is an output shaft 34 is an extension case 46 is a parking gear 47 is a speedometer gear 50 is a partition member 51 is a bolt 52 is a plate member 53 is a seal member 54, 55 is a lip

Claims (3)

An air breather chamber structure in which a hollow is formed in an inner upper portion of a case member of a transmission to form an air breather chamber, and the air breather chamber rotates relative to the rotating body in the case member. A plate material that is disposed in any one of the axial directions, and the distance between the bottom surface of the air breather chamber and the rotation shaft of the rotating body is smaller than the outer diameter of the rotating body, and is fitted into the recess to cover the recess. Among them, a small-diameter hole is formed in a portion near the rotating body in the case member, a large-diameter hole is formed in a portion far from the rotating body , and a line segment connecting the small-diameter hole and the large-diameter hole is rotated. An air breather chamber structure characterized by being parallel or substantially parallel to the rotation axis of the body .   2. The air breather chamber structure according to claim 1, wherein a seal member is attached to the entire peripheral edge of the plate material that fits into the recess and covers the recess.   The air breather chamber structure according to claim 2, wherein the seal member has a lip that faces the inner side of the case member and abuts against the case member.

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