JPS6246038Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a breather device for an automatic transmission installed in an automatic vehicle.

(Prior art) In automatic transmissions in which a transmission gear mechanism, a friction coupling device, etc. are disposed within a transmission case, for example, in order to prevent an abnormal increase in pressure within the case, As shown in Japanese Patent No. 104651, the mission case is provided with a breather device that communicates the inside and outside of the mission case. As shown in FIG. 3, this breather device includes a cylinder B projecting from the upper wall of a mission case A to form a breather passage C that communicates the inside of the case A with the outside. A check valve D is provided in C, and a cylindrical body B
It has a configuration in which a cap E is attached to the upper end opening, and when the pressure inside the mission case A rises, a part of the air inside the case A is used as breather air and is sent to the outside via the breather passage C and the check valve D. It was designed so that it would be released.

On the other hand, various rotating members constituting the transmission gear mechanism, frictional fastening device, etc. are housed in the transmission case, and lubricating oil is supplied to these members. When these rotating members rotate during operation, lubricated oil is scattered throughout the interior space of the transmission case. Therefore, when the air inside the mission case is released from the breather device as described above, the oil scattered inside the case is also released together with the breather air, and as a result, the outside of the mission case is exposed to the released oil. This can cause problems such as contamination or wasteful consumption of oil.

Therefore, in order to deal with such problems, conventionally, a buttful plate is provided near the entrance of the breather passage inside the mission case.
By diverting or meandering the flow of breather air using the plate and introducing it into the breather passage, oil droplets in the breather air are separated and prevented from being released to the outside. However, according to the breather device having such a structure, the number of parts and the number of assembly steps are increased due to the buff-full plate, leading to an increase in cost.

(Purpose of the invention) This invention deals with the above-mentioned actual situation regarding the breather device of an automatic transmission, in which the oil droplets inside the transmission case are released to the outside together with the breather air without the provision of a blow-full plate. It is an object of the present invention to prevent this and reduce the cost of this type of breather device.

(Structure of the invention) That is, in the breather device according to the invention, a manual plate that rotates in conjunction with a manual lever for range switching of an automatic transmission is provided at a predetermined interval below the upper wall of the transmission case. In this structure, a breather passage is provided in the upper wall of the mission case where the manual plate is always located below, providing communication between the inside and outside of the case.

According to the above configuration, the manual plate is always present directly below the entrance of the breather passage in the mission case, and therefore the manual plate allows the breather air to flow into the breather passage from inside the mission case. The flow of the air is diverted, and the oil droplets in the air are separated and removed.

(Effects of the Invention) As described above, according to the present invention, the manual plate interlocked with the manual lever functions as a blow-full plate in the breather device. Therefore, the release of oil to the outside of the transmission case is prevented without providing a separate buttful plate, and since the buttful plate is no longer required, the number of parts and assembly man-hours for the breather device are reduced. , the cost will be reduced.

(Example) Examples of the present invention will be described below.

As shown in FIG. 1, a manual shaft 2 is provided on an upper wall 1a of a main body case 1 of an automatic transmission, and extends vertically through the upper wall 1a. A manual lever (not shown) is connected to the upper end portion 2a of the manual shaft 2 that protrudes to the outside of the main body case 1 via a link mechanism, and the upper end portion 2a of the main body case 1 of the shaft 2 is connected to a manual lever (not shown).
Below a, a manual plate 3 is fixed to the inner surface of the wall 1a with a predetermined distance It is supported by the intermediate wall 1b. Further, as shown in FIG. 2, a plurality of positioning recesses 3a...3a are provided on the circumferential surface of the manual plate 3 at regular pitch intervals, and one of these recesses 3a...3a is provided with a plurality of positioning recesses 3a...3a. A positioning mechanism 4 consisting of an engaging ball 4a and a spring 4b that presses and biases the ball 4a in the engaging direction is provided on the side wall 1c of the main body case 1. A pin 3b protruding downward is provided on one side of the manual plate 3.
b is engaged with a manual valve (not shown) in the control valve unit. With these configurations, the manual shaft 2 or the manual plate 3 is rotated by operating the manual lever, and the manual valve is accordingly moved, such as P, R, etc. set in the automatic transmission. , N, D, 2, 1, etc. are switched.

On the other hand, in the case of this embodiment, one side of the main case 1 is open, and the auxiliary case 5 that closes this opening is fixed to the side end surface of the main case 1 by a plurality of bolts 6...6. has been done. A cylindrical body 7 constituting a breather device is provided on the upper wall 5a of the auxiliary case 5 to protrude upward, and the inside of the cylindrical body 7 forms a breather passage 8 that communicates the internal space Y of the cases 1 and 5 with the outside. At the same time, a cap 9 is attached to the upper end of the cylindrical body 7 via a check valve (not shown).

However, this cylindrical body 7 or breather passage 8 is
The manual plate 3 is provided at a location on the upper wall 5a of the auxiliary case 5 that is always located at a lower position regardless of its rotational position. It is always covered from below with the above distance X in between.

According to the above configuration, during operation of the automatic transmission, the internal pressure of the internal space Y of the transmission, which is composed of the main body case 1 and the auxiliary case 5, increases as the temperature of the oil increases. A part of the air in the space Y is discharged to the outside from the breather passage 8 as breather air, thereby preventing an abnormal pressure rise in the space Y.

On the other hand, lubricating oil is supplied to various rotating parts such as the speed change gear mechanism and frictional fastening device housed in the main body case 1, and after this oil lubricates each member, the rotation of these members is As a result, the oil is scattered throughout the interior space Y, and within the space Y, oil droplets are scattered in the air. Therefore, when a portion of the air is discharged from the breather passage 8 to the outside as breather air, oil droplets are also likely to be discharged together.
However, since the manual plate 3 is always located below the entrance of the breather passage 8, the breather air and oil droplets cannot directly reach the entrance of the breather passage 8 from the internal space Y.
As shown by the arrow a in the figure, it bypasses the side of the manual plate 3 and reaches the entrance of the passage 8. During the detour, the oil droplets in the breather air are removed from the manual plate 3, case 1,
It collides with the inner surfaces of 5 and adheres thereto. This prevents the oil droplets from being separated and removed from the breather air and being released to the outside, thereby preventing staining of the outside of the case and wasteful consumption of oil due to the release of the oil droplets.

Since the release of this oil droplet is blocked by the manual plate 3 as described above, there is no need to provide a separate buttful plate for the same purpose, and as a result, the number of parts and assembly steps for the breather device can be reduced. will be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a breather device and its surroundings showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line of FIG. 1. FIG. 3 is a longitudinal sectional view of a breather device showing a conventional example. 1, 5...Mission case, 3...Manual plate, 8...Breather passage.

Claims (1)

[Scope of utility model registration request] A breather device for an automatic transmission that is installed in a transmission case that houses various rotating members. The automatic transmission is characterized by comprising a rotating manual plate, and a breather passage provided at a location on the upper wall of the transmission case where the manual plate is always located below, and communicating the inside of the case with the outside. Transmission breather device.