JP2019157902A - Breather device of transmission - Google Patents

Abstract

To provide a breather device of a transmission which enables elimination of a conventional breather box to achieve reduction of costs and a weight.SOLUTION: A breather device of a transmission includes: a first case (1) in which components of the transmission are housed; and a second case (2) in which a control board for controlling the transmission is housed and which is attached to an outer surface (1a) of the first case (1). A breather mechanism for removing air in the first case (1) is provided in a gap between the outer surface (1a) of the first case (1) and an outer surface (2a) of the second case (2) which contacts with the outer surface (1a).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a breather device for a transmission for performing air circulation inside and outside the transmission and preventing leakage of oil in the transmission.

  The breather device used in a vehicle transmission is provided on a rotating shaft when the internal pressure of the transmission increases due to an increase in temperature inside the transmission case (TM case) due to engine operation. The air in the transmission case is discharged to the outside while preventing the lubricating oil from leaking from the oil seal or the like. Conventionally, the breather device is housed in a breather box, and the breather box is attached to an upper portion of a transmission case.

  In addition, the transmission control shaft and the select control shaft are provided as a breather structure for a transmission that does not easily allow water or the like to enter without using a dedicated part as a breather, and the transmission case is provided in one of the penetrating portions. There is also disclosed a breather structure having a structure in which an air breather passage for air circulation inside and outside is provided along the axial direction of the shift control shaft or select control shaft (see Patent Document 1).

  Further, a transmission control unit (Transmission Control Unit: TCU) is connected to the components of the transmission as a control unit for controlling the transmission of the vehicle. The TCU is accommodated in the TCU case and attached to the outer surface of the transmission case. Therefore, in the transmission with the conventional structure, the breather device housed in the breather box and the TCU housed in the TCU case are mounted at different locations in the transmission case.

  As described above, in the prior art, since both the TCU case and the breather box are mounted at different locations of the transmission case, there is a problem that extra cost is required and the weight and the outer shape of the transmission are increased accordingly. there were.

JP 2002-130435 A

  The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to eliminate a separate breather box by providing a breather mechanism between the TCU case and the transmission case. It is an object of the present invention to provide a breather device for a transmission that enables reduction in cost and weight.

  In order to achieve the above object, a breather device for a transmission according to the present invention includes a first case (1) in which components of the transmission are accommodated and a control base for controlling the transmission. A second case (2) attached to the outer surface (1a) of the case (1), and the outer surface (1a) of the first case (1) and the outer surface (2a) of the second case (2) in contact therewith And a breather mechanism for venting the air in the first case (1).

  Moreover, in said breather apparatus, it formed in the outer surface (2a) of the cylindrical part (10) which consists of a cylindrical hollow formed in the outer surface (1a) of the 1st case (1), and the said 2nd case (2). A column portion (3) made of a columnar protrusion, and the column portion (3) is fitted to the tube portion (10) so that the first case (1) is attached to the second case (2). You may comprise so that attachment may be made.

  According to the breather device for a transmission according to the present invention, a breather mechanism for venting the air in the first case is provided in the gap between the outer surface of the first case and the outer surface of the second case in contact therewith. The breather box provided as a body can be eliminated, and the cost and weight of the vehicle can be reduced. Further, the breather mechanism can be configured simply by fitting the column portion of the second case to the cylindrical portion of the first case, and the breather mechanism can be easily configured by attaching the second case to the first case. .

  In the breather device of the transmission, the breather mechanism is configured such that the second case (2) is attached to the outer surface (1a) of the first case (1) and the outer surface ( A breather chamber (B) formed between 1a) and the outer surface (2a) of the second case (2), and the first case (1) so as to seal the flow path of the breather chamber (B). Formed on the outer surface (2a) of the second case (2) and partially opens the seal of the seal member (21) to the flow path. The breather chamber includes a notch (7), and air that has entered from the inside of the first case (1) through the flow path in the cylinder (10) passes through the notch (7). You may comprise so that it may discharge | release outside from (B).

  According to this configuration, the air in the first case reaches the sealing member through the inside of the cylindrical portion, but there is a notch that partially opens the seal of the sealing member. It is discharged to the outside from the flow path between the first case and the second case. Therefore, the breather mechanism that discharges the air in the first case with a simple configuration can be configured.

  In the breather device of the transmission, the breather mechanism includes an oil drain hole (14) formed in the cylindrical portion (10) and communicated from the breather chamber (B) to the inside of the first case (1). And a first rib (5) protruding from the second case (2) to the breather chamber (B), and mist of oil that has come out of the second case (2) is formed in the first rib (5). ) To be liquefied and returned to the second case (2) from the oil drain hole (14).

  According to this configuration, the oil mist from the first case collides with the first rib of the second case and becomes oil by the impact and is returned as oil from the oil drain hole to the first case. Is not released to the outside and can be used effectively as a lubricating oil or the like. Further, it is possible to effectively prevent the external environment from being contaminated by the ejection of oil.

  In the breather device of the transmission, the breather mechanism includes a third rib (15) protruding from the second case (2) in the breather chamber (B), and a lower end portion of the third rib (15). The water that has entered the breather chamber (B) from the outside falls on the third rib (15) and is discharged to the outside from the notch (16). You may be comprised so that.

  According to this configuration, even if water enters from between the second case and the first case, it is blocked by the third rib and falls, and is discharged to the outside through the notch. Water is prevented from entering the inside.

  According to the breather device of the transmission of the present invention, it is possible to eliminate the separate breather mechanism by providing the breather mechanism between the outer surface of the first case and the outer surface of the second case. It becomes possible to reduce the cost and weight of the vehicle.

It is the schematic which shows the breather apparatus of the transmission which concerns on one Embodiment of this invention. It is the sectional view on the AA line of FIG. It is sectional drawing of the state which isolate | separated TM case and TCU case. It is a perspective view which shows the side which faces TM case of a TCU case. It is a perspective view of TM case, (a) is an outer surface side, (b) is a figure which shows an inner surface side. It is a figure which shows the flow of the air in a breather mechanism. It is a figure which shows the flow of the oil in a breather mechanism. It is a figure which shows the flow of the water which penetrate | invades from the outside in a breather mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic view showing a breather device for a transmission according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  As shown in FIG. 1, the breather device according to the present embodiment includes a TM case (first case) in which a transmission (not shown) including components such as a gear device and a friction engagement device (clutch and brake) is accommodated. ) This is an apparatus for venting air (air) in 1 and preventing leakage of oil in the TM case 1. As shown in the figure, a TCU case (second case) 2 that accommodates a transmission control unit is mounted on the outer surface (one side surface) of the TM case 1. Conventionally, a separate breather box is attached to the upper portion of the TM case 1 or the like, but this can be eliminated in the present invention as described below.

  As shown in FIG. 2, the breather mechanism (breather chamber B) is provided between the outer surface 1 a of the TM case 1 and the outer surface 2 a of the TCU case 2. A TCU control base (not shown) is accommodated in the TCU case 2, and a cover (lid) 20 as shown by a chain line is provided.

  FIG. 3 is a cross-sectional view showing a state where the TCU case 2 and the TM case 1 are separated, and FIG. 4 is a perspective view seen from the front side of the TCU case 2 (side facing the TM case 1).

  First, the configuration of the TCU case 2 will be described with reference to FIGS. A cylindrical portion 3 protrudes from the outer surface 2 a of the TCU case 2 facing the TM case 1, and the following ribs and grooves are formed around the cylindrical portion 3. That is, the first circumferential rib 5 protrudes from the outer periphery of the base portion of the cylindrical portion 3, and the first circumferential groove 4 is formed inside the first circumferential rib 5. A second circumferential groove 6 is formed on the outer periphery of the first circumferential rib 5. At the upper end portion of the second circumferential groove 6, a cutout portion 7 in which the lower portion is partially cutout is formed (see FIG. 4). Although detailed illustration and description are omitted, the column portion 3 and the cylindrical portion 10 function as a connector that electrically connects the control base in the TCU case 2 and the components of the transmission in the TC case 1. Is.

  Next, the configuration of the TM case 1 will be described with reference to FIGS. As shown in FIG. 1, the TM case 1 is several times larger than the TCU case 2, but in FIG. 5, only the periphery of the TCU case 2 (the portion indicated by the chain line in FIG. 1) is shown. It is partially shown in schematic form.

  On the inner side of the TM case 1, that is, on the side (right side in FIG. 2) in which the components (not shown) of the transmission are accommodated, a cylindrical portion 10 having a circular hole 8 protrudes and is provided on the outer surface 1a ( On the surface facing the TCU case 2, ribs and grooves serving as a breather mechanism are formed around the circular hole 8. In other words, the cylindrical portion 10 is formed with a circular hole 8 in which the columnar portion 3 is fitted (to be loosely fitted so that there is a gap around it), and around the circular hole 8 on the surface of the TM case 1. A second circumferential rib 11 is formed, a third circumferential groove 12 is formed on the outer periphery of the second circumferential rib 11, and an O-ring (seal member) 21 is attached to the outside of the third circumferential groove 12. An O-ring mounting groove 13 is formed for this purpose. A third circumferential rib 15 projects from the outer periphery of the O-ring mounting groove 13. A notch 16 is formed at the lower end of the third circumferential rib 15 (see FIG. 5). The lower end portion of the third circumferential groove 12 communicates with an oil drain hole 14 formed in the cylindrical portion 10 so as to come out into the TM case 1.

  As shown in FIG. 2, the cylindrical portion 3 of the TCU case 2 is fitted into the circular hole 8 of the TM case 1, the TCU case 2 is coupled to the TM case 1, and a flow comprising a slit on the inner periphery of the cylindrical portion 10. A path S1 is formed, and a breather chamber B is formed between the TCU case 2 and the TM case 1. That is, the TCU case 2 and the TM case 1 are opposed to each other with the flow paths S2 to S4 formed by slits, the second circumferential rib 11 is in the first circumferential groove 4, and the first circumferential rib 5 is in the first. The three circumferential grooves 12 are respectively fitted, and the flow path S <b> 2 is formed around the second circumferential rib 11, and the flow path S <b> 3 is formed around the first circumferential rib 5. Thereby, a breather chamber B is configured between the TM case 1 and the TCU case 2.

  The O-ring 21 mounted in the O-ring mounting groove 13 of the TM case 1 is in contact with the TCU case 2 and seals the flow paths S1 to S4. At the location of the notch 7 formed in the upper part of the second circumferential groove 6 of the TCU case 2, a gap G is formed with the O-ring 21, and air (air) can escape from this gap G. (See FIG. 6).

  Hereinafter, based on the operation explanatory diagrams of FIGS. 6, 7, and 8, a: air (air) flow, b: oil (ATF) flow, c: flow of water entering from the outside, respectively. Will be explained.

[A: Air flow]
FIG. 6 is a cross-sectional view showing the air flow in the breather mechanism. As shown in the figure, the air in the TM case 1 flows in the flow path S1 between the columnar portion 3 and the cylindrical portion 10 in the direction of the arrow P1, and the second circumferential rib 11 and the first inner circumferential groove 4 During this time, the flow path S2 between the first circumferential rib 5 and the third circumferential groove 12 flows in the direction of arrow P2, and the gap G between the O-ring 21 and the notch 7 flows in the direction of arrow P3. Then, it flows through the flow path S4 in the direction of the arrow P4 and is discharged to the outside.

[B: Oil flow]
FIG. 7 is a cross-sectional view showing the flow of oil in the breather mechanism. As shown in the figure, the mist-like oil ejected from the TM case 1 flows in the flow path S1 in the direction of the arrow P5 and collides with the inner peripheral surface of the first circumferential rib 5 as indicated by the arrow P6. This collision returns to oil from the mist state, falls downward from the flow path S2 on the inner periphery of the first circumferential rib 5, and returns to the TM case 1 from the oil drain hole 14 as lubricating oil.

[C: Flow of water entering from outside]
FIG. 8 is a cross-sectional view showing the flow of water entering from the outside in the breather mechanism. As shown in the figure, the water that has entered from the flow path S4 between the TCU case 2 and the TM case 1 flows in the direction of the arrow P8, hits the third circumferential rib 15, flows down the outer periphery thereof, flows down, It enters the lower flow path S4a from the notch 16, flows through the flow path S4a in the direction of the arrow P9, and falls downward. This prevents water from the outside from entering the TM case 1.

  As described above, according to the breather device for a transmission according to the present embodiment, by providing a breather mechanism between the TCU case 2 and the TM case 1 for performing air venting in the TM case 1 and preventing oil leakage. The breather box that has been conventionally provided as a separate body can be eliminated, and the cost and weight of the transmission and the vehicle can be reduced. Furthermore, a breather mechanism including a breather chamber B can be formed between both cases 1 and 2 simply by coupling the column portion 3 of the TCU case 2 to the cylindrical portion 10 of the TM case 1.

  Further, according to the breather device of the present embodiment, air from the inside of the TM case 1 reaches the O-ring 21 through the inside of the cylindrical portion 10, but the notch 7 that opens the seal of the O-ring 21 is formed. Therefore, it passes through the gap G and is discharged to the outside from the flow path S4 between the TM case 1 and the TCU case 2. Therefore, a breather mechanism for releasing air can be provided with a simple configuration.

  Further, according to the breather device of the present embodiment, the oil mist from the TM case 1 collides with the inner periphery of the first circumferential rib 5 and becomes liquid by the impact from the oil drain hole 14 to the TM case 1. Returned in. Therefore, the oil in the TM case 1 is not released to the outside and can be effectively used as a lubricating oil or the like. Further, it is possible to effectively prevent the external environment from being contaminated by the ejection of oil.

Further, according to the breather device of the present embodiment, even if water enters from the flow path S4 between the TCU case 2 and the TM case 1, it is blocked by the third circumferential rib 15 and falls, and the third circumferential Since it passes through the notch 16 of the rib 15 and is discharged to the outside from the lower flow path S4a, water is prevented from entering the TM case 1.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

1 TM case (first case)
2 TCU case (second case)
3 cylinder part (column part)
4 1st circumferential groove 5 1st circumferential rib (1st rib)
6 Second circumferential groove 7 Notch portion 10 Cylindrical portion (tubular portion)
11 Second circumferential rib 12 Third circumferential groove 14 Oil drain hole 15 Third circumferential rib (third rib)
16 Notch 20 Cover B Breather room

Claims (5)

A first case that houses components of the transmission;
A second case that accommodates a control base that controls the transmission and is attached to an outer surface of the first case;
A breather device for a transmission, wherein a breather mechanism is provided in the gap between the outer surface of the first case and the outer surface of the second case in contact with the outer surface of the first case. A cylindrical portion formed of a cylindrical depression formed on the outer surface of the first case;
A column part formed of a columnar protrusion formed on the outer surface of the second case,
2. The breather device for a transmission according to claim 1, wherein the first case is attached to the second case by fitting the column part to the cylinder part. The breather mechanism is
A breather chamber formed between the outer surface of the first case and the outer surface of the second case with the second case attached to the outer surface of the first case;
A seal member mounted on the outer surface of the first case so as to seal the flow path of the breather chamber;
A notch portion formed on the outer surface of the second case and partially opening the seal of the seal member with respect to the flow path;
The air that has entered from the inside of the first case through the flow path in the cylindrical portion passes through the notch and is discharged to the outside from the breather chamber. A breather device for a transmission. The breather mechanism is
An oil drain hole formed in the cylindrical portion and leading from the breather chamber to the inside of the first case;
A first rib projecting from the second case into the breather chamber,
The oil mist that has come out of the second case collides with the first rib, becomes liquid, and is returned to the second case from the oil drain hole. Gearbox breather device. The breather mechanism is
A third rib protruding from the second case in the middle of the breather chamber;
A notch formed at the lower end of the third rib,
4. The transmission according to claim 2, wherein water that has entered the breather chamber from the outside falls on the third rib and is discharged to the outside from the notch. 5. Breather device.