JP5987783B2 - Valve body cover for vehicle transmission - Google Patents

Description

  The present invention relates to a case of a vehicle transmission, and more particularly to a structure of a valve body cover that constitutes a part of the case and has a breather discharge port.

  A vehicle of a type in which a valve body is disposed in front of, behind, or on the vehicle width side of the transmission when a vehicle is mounted, and a valve body cover that is a part of the case is connected to cover the valve body is realized. . For example, the vehicle described in Patent Document 1 is an example. In Patent Document 1, a valve body 11 is arranged on the vehicle forward side with respect to the speed change mechanism, and an oil pan 3 (valve body cover) which is a part of the transmission case 1 is connected so as to cover the valve body 11. Has been. Further, the oil pan 3 is provided with a liquid level detecting device having a breather function, and a technique for suppressing the intrusion of liquid by the shielding portion 16 of the liquid level detecting device is disclosed.

JP 2001-296169 A JP-A-06-002757 JP 2003-254414 A JP-A-10-325456

  By the way, when the inside of the case of the transmission is in a high temperature state when traveling at a high vehicle speed or the like, the oil level (oil level) of the oil increases due to the expansion and foaming of the oil in the case. At this time, even in the liquid level detection device configured as in Patent Document 1, the amount of oil reaching the vicinity of the liquid level detection device increases, so that the oil is a gap between the shielding portion 16 and the tubular member 14. There is a possibility that so-called breather blowing may occur in which the oil is discharged to the outside through the air. On the other hand, Patent Documents 3 and 4 disclose that a breather chamber is provided in the vicinity of a breather discharge port communicating with the outside of the case, and a technique for preventing breather blowing by accumulating oil in the air breather chamber. Yes. However, in both the air breather chambers described in Patent Documents 3 and 4, the passage from the inlet of the air breather chamber to the breather outlet is short, and there is a high possibility that oil is not collected in the air breather chamber and is discharged outside the case. It was.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a valve body cover for a vehicle transmission that can effectively suppress breather blowing.

In order to achieve the above object, the gist of the first invention is that (a) a transmission mechanism and a part of a case housing a valve body located on the side of the transmission mechanism are configured. A valve body cover of a vehicle transmission located on the side of the case across the valve body, and (b) the valve body cover is formed in a flat shape having a predetermined depth and is mounted on the vehicle An upper wall portion formed with a breather discharge port in a vertically upward direction, a cover wall portion facing the valve body, and a pair of opposing wall portions positioned on both side ends of the upper wall portion and facing each other (C) the inner wall surface of the cover wall portion projects from the inner wall surface of the cover wall portion toward the valve body side, and one of the pair of opposing wall portions is the other The first bulkhead that continues toward (D) on the valve body side of the first partition, the plate forming the first space surrounded by the upper wall, the cover wall, the pair of opposing walls, and the first partition, or The valve body is disposed, and (e) the first partition wall is formed with a first communication hole that communicates the first space and the inside of the case at a position that does not overlap with the breather discharge port in a vertical direction in the vehicle-mounted state. (F) In the first space, a partition wall having a honeycomb structure of a cross section extending from the cover wall portion toward the valve body and partitioning the first space is formed, and (g) the partition The wall is formed with a communication hole communicating with the space partitioned by the partition wall .

If it does in this way, the breather discharge port formed in the upper wall part and the 1st communicating hole formed in the 1st partition will be set up in the position where it was separated within the range of the distance between a pair of above-mentioned opposing wall parts. can do. Therefore, by increasing the distance of the passage from the first communication hole to the breather discharge port, oil can be accumulated in the first space to suppress breather blowing. In addition, the first space is partitioned into a plurality of spaces by a partition wall having a honeycomb structure, and the plurality of spaces communicate with each other through the communication holes, so that the oil passes through the plurality of spaces before reaching the breather discharge port. The oil can be accumulated in the process. Moreover, the strength of the valve body cover can be increased by forming the honeycomb-shaped partition wall.

Further, the gist of the second invention is that: (a) a part of a case that houses a transmission mechanism and a valve body that is located on a side of the transmission mechanism is configured, and the valve body is attached to the transmission mechanism; A valve body cover for a vehicle transmission located on a side surface of the case, and (b) the valve body cover is formed in a flat plate shape having a predetermined depth, and is positioned vertically upward in an in-vehicle state. An upper wall portion in which a breather discharge port is formed, a cover wall portion that faces the valve body, and a pair of opposing wall portions that are located at both end portions of the upper wall portion and face each other, (c) The first inner wall surface of the cover wall portion projects from the inner wall surface of the cover wall portion toward the valve body side and continues from one of the pair of opposing wall portions toward the other. A partition is formed; and (d) the bar of the first partition. On the lube body side, the plate or the valve body forming the first space surrounded by the upper wall portion, the cover wall portion, the pair of opposing wall portions, and the first partition wall is disposed, and (e) the first The first partition wall is formed with a first communication hole that communicates the first space and the inside of the case at a position that does not overlap with the breather discharge port in the vehicle-mounted state, and (f) the first partition wall in the vehicle-mounted state. At least one second partition wall that protrudes from the inner wall surface of the cover wall portion toward the valve body side and continues from one side of the pair of opposing wall portions to the other is formed below the cover wall portion. (G) the plate forming a second space surrounded by the first partition, the cover wall, the pair of opposing walls, and the second partition on the valve body side of the second partition Or the valve body (H) the second partition wall is formed with second communication holes that communicate with the interior of the case or the adjacent second space, and (i) the first partition walls adjacent to each other. The communication hole and the second communication hole are formed at positions that do not overlap each other in the vertical direction in a vehicle-mounted state, and (j) between at least one of the first partition wall and the second partition wall and the plate or the valve body. A gap is formed, and the gap is clogged when the inside of the case is hot . If it does in this way, the breather discharge port formed in the upper wall part and the 1st communicating hole formed in the 1st partition will be set up in the position where it was separated within the range of the distance between a pair of above-mentioned opposing wall parts. can do. Therefore, by increasing the distance of the passage from the first communication hole to the breather discharge port, oil can be accumulated in the first space to suppress breather blowing. Further, at least one second space also vertically below the first space is formed in the vehicle-mounted state, the second communication which is formed in the second partition wall located below the first communication hole formed in the first partition wall By forming the hole so as not to overlap with the vertical direction, the distance from the first communication hole to the second communication hole in the second space can be increased. In the case where two or more second partitions are formed, the second communication hole formed in the upper second partition and the second partition formed in the lower second partition adjacent to the second partition. By forming the two communication holes at positions that do not overlap in the vertical direction, the distance to the second communication holes can be increased. Accordingly, the distance of the passage through which the oil passes between the second communication hole and the breather discharge port is increased, the oil is reliably accumulated in the first space or the second space, and the breather blowing is effectively suppressed. it can. Further, since the gap is clogged if the inside of the case is at a high temperature, a breather chamber is formed and breather blowing is suppressed. In addition, since a gap is formed when the inside of the case is cold, oil stored in the breather chamber falls from the gap. Therefore, it is possible to efficiently prevent the breather from blowing and drop the oil.

Preferably, the gist of the third invention is the valve body cover of the vehicle transmission according to the second invention , wherein the upper wall portion and the first partition wall are connected to each other. Then, at least one first partition wall that partitions the first space is formed, and the first space partitioned by the first partition wall at a connection portion between the first partition wall and the first partition wall. A third communication hole is formed to communicate with each other. With this configuration, when the oil passes through the third communication hole formed in the first partition wall, the oil is appropriately accumulated in the space partitioned by the first partition wall of the first space. Is done. Therefore, breather blowing can be effectively suppressed.

  Preferably, the gist of the fourth invention is the valve body cover of the vehicle transmission of the second invention, wherein the second space has a space between the first partition and the second partition. Or at least one second partition wall that connects the adjacent second partition walls to partition the second space, and is located on the vertically lower side in the in-vehicle state of the second partition wall. A fourth communication hole that communicates the second space partitioned by the second partition wall is formed in a connection portion with the two partition walls. With this configuration, even when oil passes through the fourth communication hole formed in the second partition wall, the oil is appropriately contained in the space partitioned by the second partition wall of the second space. Accumulated. Therefore, breather blowing can be effectively suppressed.

Preferably, the subject matter of the fifth invention is a valve body cover for a vehicle transmission according to the first invention , wherein a gap is formed between the partition wall and the plate or the valve body. The gap is clogged when the inside of the case is hot. In this way, if the inside of the case is hot, the gap is clogged, so that a breather chamber is formed and breather blowing is suppressed. In addition, since a gap is formed when the inside of the case is cold, oil stored in the breather chamber falls from the gap. Therefore, it is possible to efficiently prevent the breather from blowing and drop the oil.

The gist of the sixth invention is the valve body cover of the vehicle transmission according to any one of the first to fifth inventions, wherein the valve body cover is formed of a resin material. In this way, the partition provided on the valve body cover can be integrally formed with the valve body cover, so that the productivity of the valve body cover is improved and the valve body cover can be manufactured at low cost.

It is a schematic block diagram explaining an example of a vehicle having a vehicle drive device to which the present invention is applied. It is a figure which shows the shape of the valve body cover of FIG. 1 in detail. It is a figure which shows the shape of the valve body cover which is the other Example of this invention in detail. It is a figure which shows the structure of the valve body cover which is further another Example of this invention. It is a figure which shows the structure of the valve body cover which is further another Example of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a schematic diagram illustrating an example of a vehicle having a vehicle drive device 10 to which the present invention is applied, and includes an engine 14 (ENG) and a transaxle 16 (T / A). The transaxle 16 is preferably used for an FF vehicle mounted in the left-right direction (horizontal placement) of the vehicle. The transaxle 16 includes a torque converter 18 (T / C), a transmission mechanism 19 (A / T), and a differential gear device 20. The engine 14 as a driving force source is an internal combustion engine such as a gasoline engine or a diesel engine that generates power by burning fuel, and the torque converter 18 corresponds to a fluid transmission device. The power output from the engine 14 is transmitted to the drive wheels 24 through the torque converter 18, the transmission mechanism 19, the differential gear device 20, and the left and right axles 22.

  A transmission mechanism 19 indicated by a one-dot chain line has one or more sets of planetary gear devices and a plurality of engagement devices (engagement elements) in a transaxle case 26 as a non-rotating member attached to the vehicle body. This is a known planetary gear type automatic transmission in which a plurality of gear stages are alternatively established by an engagement device. For example, the speed change mechanism 19 performs a so-called clutch-to-clutch speed change in which a speed change is executed by re-holding any of a plurality of engagement devices (that is, by switching between engagement and release of the engagement devices). Machine. The plurality of engagement devices are hydraulic friction engagement devices that transmit rotation and torque between an input shaft 28 that receives power from the torque converter 18 and an output gear 30 that transmits power to the drive wheels 24. is there. The input shaft 28 is an input shaft of the speed change mechanism 19, but is also a turbine shaft that is rotationally driven by a turbine impeller of the torque converter 18. The output gear 30 corresponds to an output rotating member of the speed change mechanism 19. In this embodiment, the output gear 30 is an output gear, that is, a differential drive gear that meshes with a driven gear (large diameter gear) 32 of the differential gear device 20 shown in FIG. is there. In addition, the transmission 21 for vehicles of this invention is comprised including the transmission mechanism 19 and the transaxle case 26. FIG.

  The transaxle case 26 is integrally formed by connecting an axle housing 34, an axle case 36, and a valve body cover 38 to each other. In this embodiment, the valve body 40 is located on the side of the speed change mechanism 19 (the side on the vehicle forward side), and the valve body 40 is disposed on the side surface of the position where the valve body 40 is separated from the speed change mechanism 19. The cover 38 is positioned so as to cover the valve body 40. The transaxle case 26 corresponds to the case of the present invention.

  FIG. 2 is a view showing the shape of the valve body cover 38 of FIG. 1 in detail. FIG. 2A shows the shape of the inner wall side (inner side) of the valve body cover 38, and FIG. 2B is a view as seen from the direction of the arrow A in FIG. As shown in FIG. 2, the valve body cover 38 constitutes a part of the case 26 that accommodates the transmission mechanism 19 and the like, and the outer frame is formed in a flat pan shape having a substantially rectangular shape and a predetermined depth. . In FIG. 2A, a mating surface 46 is formed along the outer frame, and this mating surface 46 is fastened to the mating surface of the axle case 36 with a bolt (not shown).

  In FIG. 2A, the upper side corresponds to the vertically upper side when mounted on the vehicle, and the lower side corresponds to the vertically lower side. Moreover, in Fig.2 (a), the left-right direction respond | corresponds to the vehicle width direction at the time of vehicle mounting. In FIG. 2B, the left side corresponds to the vehicle forward direction when mounted on the vehicle, and the right side corresponds to the vehicle reverse direction.

  A dashed line in FIG. 2B corresponds to the valve body 40 in FIG. The valve body 40 is disposed so as to be accommodated in the valve body cover 38 and has a stepped shape so as not to interfere with a breather chamber 62 described later formed in the valve body cover 38.

  The valve body cover 38 is made of a resin material, and when mounted on the vehicle, the upper wall portion 50 positioned vertically upward, the lower wall portion 52 positioned vertically downward, and both end portions of the upper wall portion 50 (both sides in the vehicle width direction). ) And a pair of facing wall portions 56a and 56b facing each other, and a cover wall portion 58 that faces the valve body 40 and is perpendicular to the vehicle forward direction when mounted. By connecting them together, the valve body cover 38 is formed in a flat pan shape with the cover wall portion 58 as a bottom surface. In the following description, the vertical direction and the vehicle width direction are based on the vehicle-mounted state (the state where the transaxle 16 is mounted on the vehicle).

  A breather discharge port 60 that communicates the inside and the outside of the transaxle case 26 is formed in the upper wall portion 50 that is positioned vertically above a first partition wall 64 (see FIG. 2) that will be described later in the on-vehicle state. . The air inside the case is appropriately discharged from a breather (not shown) attached to the end of the breather discharge port 60, whereby the pressure inside the case is maintained at a predetermined value or less.

  By the way, when the transaxle 16 is assembled, a predetermined amount of oil is filled therein. For example, when the vehicle is stopped, the oil is filled up to the height of the oil level indicated by the one-dot chain line in FIG. The height of the oil level changes according to the traveling state of the vehicle. For example, when the stored oil is scraped up by the driven gear 32 or the like, the oil level is lowered. For example, when traveling at a high vehicle speed, the oil is agitated by the driven gear 32 to generate heat and expand to form bubbles, thereby increasing the height of the oil surface. At this time, there is a possibility of so-called breather blowing in which the oil reaches the vicinity of the breather discharge port 60 and blows out from the breather discharge port 60 to the outside of the case.

  On the other hand, in this embodiment, the breather chamber 62 is provided between the inside of the transaxle case 26 and the breather discharge port 60 to prevent oil from reaching the breather discharge port 60. Hereinafter, the structure of the breather chamber 62 which is a main part of the present invention will be described in detail.

  As shown in FIG. 2, reinforcing ribs indicated by diagonal lines are formed on the inner wall surface of the valve body cover 38. Specifically, a first partition wall 64, a second partition wall 66, and a third partition wall 68 that are continuous in the vehicle width direction are formed in order from the upper wall portion 50 side toward the lower wall portion 52. Each of the first partition wall 64 to the third partition wall 68 protrudes from the inner wall surface of the cover wall portion 58 to a predetermined height toward the valve body 40 and extends from one of the pair of opposing wall portions 56 to the other. Thus, the opposing wall portions (56a, 56b) are connected. As shown in FIG. 2A, the first partition wall 64 to the third partition wall 68 of the present embodiment connect the two wall portions of the pair of opposing wall portions 56 substantially in parallel. In FIG. 2B, each partition wall (first partition wall 64 to third partition wall 68) and a plate 70 described later are shown so that the structure (shape) of the first partition wall 64 to the third partition wall 68 can be understood. ing. The third partition 68 corresponds to the second partition of the present invention.

  As shown in FIG. 2B, the height of each partition wall (the first partition wall 64 to the third partition wall 68) in the direction of the valve body 40 is formed such that the end portions thereof are the same height. And the plate 70 which consists of an iron plate which is a press component, for example is connected (arrange | positioned) to the edge part. Thus, a sealed first space 72 surrounded by the upper wall portion 50, the pair of opposing wall portions 56a and 56b, the first partition wall 64, the cover wall portion 58, and the plate 70 is formed. Further, a second space 74 that is enclosed and sealed by the first partition wall 64, the pair of opposing wall portions 56 a and 56 b, the second partition wall 66, the cover wall portion 58, and the plate 70 is formed. In addition, a third space 76 that is enclosed and sealed by the second partition wall 66, the pair of opposing wall portions 56 a and 56 b, the third partition wall 68, the cover wall portion 58, and the plate 70 is formed. The plate 70 is connected to each partition wall or a partition wall described later by, for example, bolts or adhesion. Further, the third space 76 corresponds to the second space of the present invention, like the second space 74.

  The first partition wall 64 is formed with a first communication hole 78 that communicates the first space 72 and the second space 74. The height of the first partition wall 64 in which the first communication hole 78 is formed toward the valve body side is lower than the height of the first partition wall 64 in which the first communication hole 78 is not formed. Therefore, when the plate 70 is connected, a gap is formed between the plate 70 and the first partition wall 64, and this gap functions as the first communication hole 78.

  The first communication hole 78 is formed at a position that does not overlap with the breather outlet 60 in the vertical direction. Specifically, the breather discharge port 60 is formed on the opposing wall portion 56a side (near the opposing wall portion 56a) in the vehicle width direction, whereas the first communication hole 78 is the opposing wall portion 56b in the vehicle width direction. It is formed on the side (near the opposing wall 56b). Therefore, the air that has entered the first space 72 from the first communication hole 78 reaches the breather discharge port 60 through a passage formed in the first space 72 in the vehicle width direction.

  A second communication hole 80 that connects the second space 74 and the third space 76 is formed in the second partition 66 that is positioned vertically below the first partition 64 in the in-vehicle state. The height of the second partition wall 66 where the second communication hole 80 is formed toward the valve body is lower than the height of the second partition wall 66 where the second communication hole 80 is not formed. Therefore, when the plate 70 is connected, a gap is formed between the plate 70 and the second partition 66, and this gap functions as the second communication hole 80.

  The second communication hole 80 is formed at a position that does not overlap with the adjacent first communication hole 78 in the vertical direction. Specifically, the first communication hole 78 is formed on the opposing wall portion 56b side (near the opposing wall portion 56b) in the vehicle width direction, whereas the second communication hole 80 is the opposing wall portion in the vehicle width direction. It is formed on the 56a side (near the opposing wall portion 56a). Therefore, the air that has entered the second space 74 from the second communication hole 80 reaches the first communication hole 78 through a passage formed in the second space 74 in the vehicle width direction.

  A third communication hole 82 that connects the third space 76 and the inside of the case is formed in the third partition wall 68 that is positioned vertically below the second partition wall 66 in the on-vehicle state. The height of the third partition wall 68 where the third communication hole 82 is formed toward the valve body side is formed lower than the height of the third partition wall 68 where the third communication hole 82 is not formed. Therefore, when the plate 70 is connected, a gap is formed between the plate 70 and the third partition wall 68, and this gap functions as the third communication hole 82.

  The third communication hole 82 is formed at a position that does not overlap with the adjacent second communication hole 80 in the vertical direction. Specifically, the second communication hole 80 is formed on the opposing wall portion 56a side (near the opposing wall portion 56a) in the vehicle width direction, whereas the third communication hole 82 is the opposing wall portion in the vehicle width direction. It is formed on the 56b side (near the opposing wall portion 56b). Accordingly, air that has entered the third space 76 from the third communication hole 82 reaches the second communication hole 80 through a passage formed in the third space 76 in the vehicle width direction. The third communication hole 82 corresponds to the second communication hole of the present invention.

  Thus, the breather outlet 60 and the first communication hole 78 to the third communication hole 82 are formed at positions where holes adjacent to each other through the spaces do not overlap in the vertical direction. Therefore, a path that crosses the space (the first space 72 to the third space 76) in the vehicle width direction is formed between the adjacent communication holes. Accordingly, when air passes through the first space 72 to the third space 76, these spaces cross in the vehicle width direction.

  The first space 72 is partitioned between the upper wall portion 50 of the valve body cover 38 and the first partition wall 64 and between the cover wall portion 58 and the plate 70 to partition the first space 72. A plurality of (three in this embodiment) first partition walls 84 are formed. The first partition wall 84 extends from the inner wall surface of the cover wall portion 58 toward the plate 70 side (valve body 40 side), and extends vertically downward from the upper wall portion 50 toward the first partition wall 64. . By the three first partition walls 84, the first space 72 is further partitioned into a plurality of (four in this embodiment) spaces.

  Each first partition wall 84 is formed with a fourth communication hole 86 communicating with the four first spaces 72 partitioned. The fourth communication hole 86 is formed at a connection portion between the first partition wall 84 and the first partition wall 64. That is, the fourth communication hole 86 is formed at the vertical lower end of the first partition wall 84. The first partition wall 84 in which the fourth communication hole 86 is formed is a wall on the valve body 40 side as compared to a part (part connected to the plate 70) where the fourth communication hole 86 of the first partition wall 84 is not formed. Is formed with a low height. Thus, when the plate 70 is connected, a gap is formed between the first partition wall 84 and the plate 70, and the gap functions as the fourth communication hole 86. Accordingly, the four spaces formed so as to partition the first space 72 are communicated with each other through the fourth communication hole 86. The fourth communication hole 86 corresponds to the third communication hole of the present invention.

  The second space 74 is connected to the first partition wall 64 and the second partition wall 66 and is connected to the cover wall portion 58 and the plate 70 to partition the second space 74. In the embodiment, three) second partition walls 88 are formed. The second partition wall 88 extends from the inner wall surface of the cover wall portion 58 toward the plate 70 side (valve body 40 side) and extends continuously downward from the first partition wall 64 toward the second partition wall 66. ing. By the three second partition walls 88, the second space 74 is further partitioned into a plurality of (four in this embodiment) spaces.

  Each second partition wall 88 is formed with a fifth communication hole 90 communicating with the second space 74 partitioned into four. The fifth communication hole 90 is formed at a connection portion between the second partition wall 88 and the second partition wall 66. That is, the fifth communication hole 90 is formed at the vertical lower end of the second partition wall 88. The second partition wall 88 in which the fifth communication hole 90 is formed is a wall on the valve body 40 side as compared to a part (part connected to the plate 70) in which the fifth communication hole 90 of the second partition wall 88 is not formed. Is formed with a low height. Thus, when the plate 70 is connected, a gap is formed between the second partition wall 88 and the plate 70, and the gap functions as the fifth communication hole 90. Accordingly, the four spaces formed so as to partition the second space 74 are communicated with each other through the fifth communication hole 90. The fifth communication hole 90 corresponds to the fourth communication hole of the present invention.

  The third space 76 is connected to the second partition wall 66 and the third partition wall 68, and is connected to the cover wall portion 58 and the plate 70 to partition the third space 76. In the embodiment, five) third partition walls 92 are formed. The third partition wall 92 extends from the inner wall surface of the cover wall portion 58 toward the plate 70 side (valve body 40 side), and continues from the second partition wall 66 toward the third partition wall 68 vertically downward. It is growing. By the five third partition walls 92, the third space 76 is further partitioned into a plurality of (six in this embodiment) spaces. In addition, the 3rd partition wall 92 respond | corresponds to the 2nd partition wall of this invention similarly to the 2nd partition wall 88. FIG.

  Each third partition wall 92 is formed with a sixth communication hole 94 that communicates with the third space 76 partitioned into six. The sixth communication hole 94 is formed at a connection portion between the third partition wall 92 and the third partition wall 68. That is, the sixth communication hole 94 is formed at the vertical lower end of the third partition wall 92. The third partition wall 92 in which the sixth communication hole 94 is formed has a higher height toward the valve body 40 than the part of the third partition wall 92 in which the sixth communication hole 94 is not formed (part connected to the plate 70). Is formed low. Thus, when the plate 70 is connected, a gap is formed between the third partition wall 92 and the plate 70, and the gap functions as the sixth communication hole 94. Accordingly, the six spaces formed so as to partition the third space 76 are communicated with each other through the sixth communication hole 94. The sixth communication hole 94 corresponds to the fourth communication hole of the present invention.

  In this manner, the first partition wall 64 to the third partition wall 68 and the first partition wall 84 to the third partition wall 92 are formed in the valve body cover 38 and the plate 70 is connected to the breather discharge port. A plurality of spaces functioning as breather chambers 62 are formed between 60 and the third communication hole 82. Further, the first space 72 to the third space 76 are communicated in the vertical direction by the first communication hole 78 to the third communication hole 82, and the first space 72 to the third space are communicated by the fourth communication hole to the sixth communication hole 94. The space 76 is communicated in the vehicle width direction. Accordingly, a plurality of spaces formed so as to partition the first space 72 to the third space 76 are formed between the breather discharge port 60 and the third communication hole 82, and a passage passing through each space is formed. The Moreover, the surface area of the breather chamber 62 is increased by forming a plurality of spaces.

  Here, during high vehicle speed traveling, the oil in the transaxle case 26 expands and bubbles, so that the oil level increases, and the bubbled oil enters from the third communication hole 82, There is a possibility that so-called breather blowing that is discharged from the breather outlet 60 may occur. However, in order for the oil that has entered from the third communication hole 82 to reach the breather discharge port 60, as indicated by the arrows, the oil passes through the plurality of spaces formed in the first space 72 to the third space 76, respectively. It is necessary that oil is accumulated in any space by its own viscosity or surface tension until it reaches the breather outlet 60. Accordingly, it is possible to prevent the oil in the transaxle case 26 from being blown by the breather that is discharged to the outside of the case.

  In addition, the first partition wall 64 to the third partition wall 68 and the first partition wall 84 to the third partition wall 92 of the present embodiment are made of the same resin material as the valve body cover 38. Therefore, these partition walls and partition walls are integrally formed with the valve body cover 38.

  As described above, according to the present embodiment, the breather discharge port 60 formed in the upper wall portion 50 and the first communication hole 78 formed in the first partition wall 64 are connected to the pair of opposing wall portions 56a and 56b. It can be set at a position separated within the range of the distance between them. Therefore, the distance of the passage from the first communication hole 78 to the breather discharge port 60 can be increased, and oil can be accumulated in the first space 72 to suppress breather blowing.

  Further, according to the present embodiment, the second space 74 and the third space 76 are also formed vertically below the first space 72. In addition, the first communication hole 78 formed in the first partition wall 64 and the second communication hole 80 formed in the second partition wall 66 positioned below the first communication hole 78 are formed at positions that do not overlap in the vertical direction. In the two spaces 74, the distance in the vehicle width direction from the first communication hole 78 to the second communication hole 80 can be increased. Further, the second communication hole 80 formed in the second partition 66 and the third communication hole 82 formed in the third partition 68 adjacent to the second partition 66 are formed at positions that do not overlap in the vertical direction. Thus, the distance in the vehicle width direction from the second communication hole 80 to the third communication hole 82 can be increased. Therefore, the distance of the passage through which the oil passes between the third communication hole 82 and the breather discharge port 60 is increased, and the oil is reliably accumulated in the first space 72 to the third space 76, so that the breather blow is effectively performed. Can be suppressed.

  Further, according to this embodiment, when oil passes through the fourth communication hole 86 formed in the first partition wall 84, the oil is partitioned by the first partition wall 84 of the first space 72. It accumulates suitably in the inside. Therefore, breather blowing can be effectively suppressed.

  Further, according to the present embodiment, even when oil passes through the fifth communication hole 90 formed in the second partition wall 88 and the sixth communication hole 94 formed in the third partition wall 92, Oil is appropriately accumulated in a space partitioned by the second partition wall 88 of the second space 74 or a space partitioned by the third partition wall 92 of the third space 76. Therefore, breather blowing can be effectively suppressed.

  Further, according to the present embodiment, the first partition wall 64 to the third partition wall 68 and the first partition wall 84 to the third partition wall 92 provided on the valve body cover 38 are made of the same resin material as the valve body cover 38. The Therefore, since these partition walls and partition walls can be integrally formed with the valve body cover 38, the productivity of the valve body cover 38 is improved, and the valve body cover 38 can be manufactured at a low cost.

  Next, another embodiment of the present invention will be described. In the following description, parts common to those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 3 is a diagram showing in detail the shape of a valve body cover 100 which is another embodiment of the present invention, and corresponds to FIG. In this embodiment, the breather chamber 101 is formed by the reinforcing ribs formed on the inner wall of the valve body cover 100 having a honeycomb structure. Hereinafter, the structure of the valve body cover 100 will be described in detail.

  The valve body cover 100 is made of a resin material, and has an outer frame having a substantially square flat shape. The valve body cover 100 includes an upper wall portion 102 positioned in the vertical direction, a lower wall portion 104 positioned vertically downward, a pair of opposing wall portions 106a and 106b positioned at both end portions in the vehicle width direction, and a valve body. And a cover wall 108 that is perpendicular to the vehicle forward direction when mounted on a vehicle.

  The inner wall of the valve body cover 100 protrudes from the inner wall surface of the cover wall portion 108 to the valve body 40 side to a predetermined height and is continuous from one of the pair of opposing wall portions 106 toward the other. A first partition 110 is formed to connect the wall portions 106a and 106b. A first communication hole 114 is formed on the opposing wall 106b side (near the opposing wall 106b) in the vehicle width direction of the first partition 110. The first communication hole 114 is formed at a position that does not overlap with the breather discharge port 116 in the vertical direction.

  A partition wall 118 having a cross section of a honeycomb structure is formed in a first space 117 formed between the first partition wall 110 and the upper wall portion 102. The partition wall 118 protrudes from the cover wall portion 108 toward the valve body 40 to the same height as the first partition wall 110 and partitions the first space 117. The lower end of the partition wall 118 is connected to the first partition 110. By forming the partition wall 118 in a honeycomb structure, a plurality of hexagonal spaces 120 are formed. This space 120 functions as the breather chamber 101 of this embodiment. In addition, although not shown, the breather chamber 101 is hermetically sealed by arranging (connecting) plates at the valve body side ends of the first partition 110 and the partition wall 118.

  The partition wall 118 is formed with a plurality of communication holes 122 that allow communication between adjacent spaces 120 partitioned by the partition wall 118. The communication holes 122 are formed at positions on both sides of the vertical lower end in the hexagonal space 120. The communication hole 122 is formed such that the height of the partition wall 118 in which the communication hole 122 is formed is lower than the height of the partition wall 118 in which the communication hole 122 is not formed, so that the plate is connected. It is a gap formed in.

  In the breather chamber 101 formed as described above, for example, even if oil that has been bubbled during high-speed traveling enters the first communication hole 114, it passes through the communication holes 122 that communicate with each space 120 of the breather chamber 101. In addition, oil accumulates in the space due to its own viscosity and surface tension. Therefore, breather blowing in which oil in the transaxle case is discharged to the outside of the case is suitably prevented. In addition, when the vehicle stops, the accumulated oil moves downward. However, since the communication holes 122 are formed on both sides of the vertical lower end of each space 120, the oil is further positioned on the lower side through the communication holes 122. Move to space 120. Then, when the oil moves to the space 120 adjacent to the first partition 110, the oil falls from the first communication hole 114 into the case.

  As described above, according to the present embodiment, the space vertically above the first partition 110 is partitioned into the plurality of spaces 120 by the partition wall 118 having the honeycomb structure, and the plurality of spaces 120 are communicated by the communication holes 122. Therefore, the oil passes through the plurality of spaces 120 until it reaches the breather outlet 116, and the oil can be accumulated in the process. Moreover, the strength of the valve body cover 100 can be increased by forming the honeycomb-shaped partition wall 118.

  Further, since the communication holes 122 are formed at both sides of the vertical lower end of each space 120, the accumulated oil moves downward through the communication holes 122 and falls into the case. Therefore, it is possible to prevent oil from being trapped in the space 120.

  FIG. 4 is a view showing the structure of a valve body cover 200 that is still another embodiment of the present invention, and corresponds to FIG. 2B of the above-described embodiment. In the valve body cover 200 of this embodiment, a minute gap 206 is formed between the first partition 202 and the second partition 204 and the plate 70. In addition, the end of the third partition 208 is connected to the plate 70.

  The valve body cover 200 is in the state shown in FIG. 4 at low temperatures, and a gap 206 is formed between the first partition 202 and the second partition 204 and the plate 70. On the other hand, when the inside of the case is hot, the first partition 202 and the second partition 204 expand, and the first partition 202 and the second partition 204 and the plate 70 come into contact with each other. Accordingly, since the gap 206 is clogged in a traveling state in which the inside of the case is at a high temperature, such as at high vehicle speeds, each space is sealed and functions as a breather chamber. Accordingly, breather blowing that occurs at high temperatures is effectively prevented. On the other hand, since the gap 206 is formed at a low temperature when the possibility of breather blowing is low, the oil accumulated in each space falls from the gap 206.

  Thus, in order to close the gap 206 between the first partition 202 and the second partition 204 and the plate 70 at a high temperature, the thermal expansion coefficients of the first partition 202 and the second partition 204 and the third partition 208 It is necessary to make the coefficient of thermal expansion different. For example, by configuring the first partition 202, the second partition 204, and the third partition 208 with materials having different thermal expansion coefficients, the above-described effect (operation) can be obtained using the difference in thermal expansion coefficient. .

  Further, if the plate 70 is not connected to the first partition 202 to the third partition 208 but connected to the upper wall portion 210 and the pair of opposing wall portions 212, the third partition 208 and the first partition 202 and The second partition wall 204 can be made of the same material, and the gap 206 can also be set in the third partition wall 208. In this case, since the gap 206 is also formed in the third partition 208 at a low temperature, the oil in the breather chamber can be effectively dropped. In addition, since the first partition 202 to the third partition 208 are made of a common material, integral molding is also possible.

  Further, the gap is not only in the breather chamber composed of the first partition 202 to the third partition 208 as shown in FIG. 2, but also in the breather chamber 101 composed of the partition wall 118 having the honeycomb structure shown in FIG. Applicable. Even in the case where the gap 206 is formed in the structure shown in FIG. 3, the breather chamber 101 is formed by clogging the gap 206 when the inside of the case reaches a high temperature, and the same effect as in the above-described embodiment can be obtained.

  Further, since the gap 206 is formed when the inside of the case becomes low temperature, oil falls from the gap. Here, in the valve body cover 100 of the above-described embodiment, the position of the communication hole 122 is limited to the lower end of the space 120 so that the oil falls downward, but when the gap 206 is formed, the gap Since oil falls from 206, the formation position of the communication hole 122 is not restricted and can be freely set. Further, when the gap 206 is set, oil automatically drops from the gap 206 at a low temperature, so that the structure (rib shape) of the partition wall 118 can be further freely changed, for example, a triangular shape. .

  As described above, according to the present embodiment, the gap 206 is formed between the first partition 202 and the second partition 204 and the plate 70, and the gap 206 is clogged when the inside of the case is hot. . In this way, if the inside of the transaxle case 26 is at a high temperature, the gap 206 is clogged, so that a breather chamber is formed and breather blowing is suppressed. Since the gap 206 is formed when the inside of the transaxle case 26 is at a low temperature, the oil stored in the breather chamber falls from the gap 206. Therefore, it is possible to efficiently prevent the breather from blowing and drop the oil.

  Further, according to the present embodiment, the gap 206 is formed between the end of the partition wall 118 and the plate 70, and the gap 206 is clogged when the inside of the transaxle case 26 is hot. In this way, if the inside of the transaxle case 26 is at a high temperature, the gap 206 is clogged, so that a breather chamber is formed and breather blowing is suppressed. Further, since the gap 206 is formed when the inside of the transaxle case 26 is at a low temperature, the oil stored in the breather chamber falls from the gap. Therefore, it is possible to efficiently prevent the breather from blowing and drop the oil.

  FIG. 5 is a view showing a structure of a valve body cover 300 which is still another embodiment of the present invention, and corresponds to FIG. 2 (b) of the above-described embodiment. Since the valve body cover 300 of the present embodiment is basically the same as the valve body cover 38 of FIG. 2 described above, the reference numerals are the same.

  In the valve body cover 300 of the present embodiment, the end portions of the first partition wall 64 to the third partition wall 68 are connected to a valve body 302 indicated by a one-dot chain line. The same applies to the first partition wall 84 to the third partition wall 92. With this configuration, the plate 70 can be omitted. In addition, the 1st partition 64 thru | or the 3rd partition 68 are connected by the volt | bolt which is not shown in figure which penetrates the valve body 302, for example.

  Thus, even when connected to the valve body 302 instead of the plate 70, the same effects as those of the above-described embodiment can be obtained, and the increase in the number of parts can be suppressed by omitting the plate 70.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, the above-described embodiments are described independently, but the embodiments may be combined appropriately.

  In the above-described embodiment, the first partition wall 64 to the third partition wall 68 are connected in parallel between the pair of opposing wall portions 56a and 56b, but may not necessarily be formed in parallel. For example, the first partition wall 64 is formed to be lower in the vertical direction toward the opposing wall portion 56b side (first communication hole 78 side), and the second partition wall 66 is directed to the opposing wall portion 56a side (second communication hole 80 side). Accordingly, the third partition wall 68 is formed low in the vertical direction toward the opposing wall portion 56b side (the third communication hole 82 side). With this configuration, the oil accumulated in the breather chamber while the vehicle is stopped quickly falls to the lower part of the transaxle case 26 due to gravity.

  In the above-described embodiment, the partition walls (84, 88, 92) are formed in the vertical direction. However, the partition walls (84, 88, 92) are not necessarily limited to the vertical direction, and may be formed inclined with respect to the vertical direction. Absent.

  Further, in the above-described embodiment, the breather discharge port 60 is formed in the vicinity of the opposing wall portion 56a in the vehicle width direction, and the first communication hole 78 is formed in the vicinity of the opposing wall portion 56b in the vehicle width direction. Although it is the position which does not overlap in the perpendicular direction, it is not necessarily limited to this. That is, the position of the breather outlet 60 and the first communication hole 78 may be changed as appropriate within a range in which they do not overlap in the vertical direction. For example, the breather discharge port 60 may be formed in the central portion in the vehicle width direction, and the first communication hole 78 may be formed in any one of the opposing wall portions 56 in the vehicle width direction. However, it is preferable that the breather discharge port 60 and the first communication hole 78 are separated in the vehicle width direction, and preferably the distance in the vehicle width direction between the breather discharge port 60 and the first communication hole 78 is preferably. The length of the first partition wall 64 is preferably half or more of the length in the vehicle width direction.

  In the above-described embodiment, the first communication hole 78 is formed in the vicinity of the opposing wall portion 56b in the vehicle width direction, and the second communication hole 80 is formed on the opposing wall portion 56a side in the vehicle width direction. However, it is not necessarily limited to this. That is, the position of the first communication hole 78 and the second communication hole 80 may be appropriately changed within a range where they do not overlap in the vertical direction. However, the first communication hole 78 and the second communication hole 80 are preferably separated from each other in the vehicle width direction. Preferably, the first communication hole 78 and the second communication hole 80 are arranged in the vehicle width direction. The distance is preferably at least half the distance between the pair of opposing wall portions 56.

  In the above-described embodiment, the second communication hole 80 is formed in the vicinity of the opposing wall portion 56a in the vehicle width direction, and the third communication hole 82 is formed on the opposing wall portion 56b side in the vehicle width direction. However, it is not necessarily limited to this. That is, the position of the second communication hole 80 and the third communication hole 82 may be changed as appropriate within a range where they do not overlap in the vertical direction. However, it is preferable that the second communication hole 80 and the third communication hole 82 are separated from each other in the vehicle width direction, and preferably in the vehicle width direction between the second communication hole 80 and the third communication hole 82. The distance is preferably at least half the distance between the pair of opposing wall portions 56.

  In the above-described embodiment, the first partition wall 64 to the third partition wall 68 are formed, so that three spaces of the first space 72 to the third space 76 are formed. You can also increase the space. That is, the breather chamber may be further multi-staged. Even when the breather chamber is multistaged, the communication holes that communicate these spaces are formed at positions that do not overlap in the vertical direction.

  In the above-described embodiment, the second partition 66 and the third partition 68 may be omitted, or the third partition 68 may be omitted. That is, the second space 74 and the third space 76, or the third space 76 may be omitted. When the second space 74 and the third space 76 are omitted, the first communication port 78 communicates with the inside of the case, and when the third space 76 is omitted, the second communication port 80 is the case. Communicate with the inside.

  In the above-described embodiment, three first partition walls 84 and two second partition walls 88 and five third partition walls 92 are formed. However, these numbers are merely examples and may be changed as appropriate. I do not care.

  In the above-described embodiment, the valve body cover 38 is provided on the vehicle forward direction side, but may be provided on the vehicle reverse direction side or the vehicle width side.

  In the above-described embodiment, the valve body cover, the partition wall, and the partition wall are all made of a resin material, but may be made of other materials such as aluminum.

  In the above-described embodiment, the plate 70 is made of an iron plate. However, the plate 70 may be made of, for example, a resin component and welded to the valve body cover.

  The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

19: Transmission mechanism 21: Transmission for vehicle 26: Transaxle case (case)
38, 100, 200, 300: Valve body cover 40, 302: Valve body 50, 102, 210: Upper wall portion 56, 106, 212: A pair of opposing wall portions 58, 108: Cover wall portion 60, 116: Breather discharge Outlet 64, 110, 202: first partition 66, 204: second partition 68, 208: third partition (second partition)
70: Plate 72: First space 74: Second space 76: Third space (second space)
78: First communication hole 80: Second communication hole 82: Third communication hole (second communication hole)
84: First partition wall 86: Fourth communication hole (third communication hole)
88: Second partition wall 90: Fifth communication hole (fourth communication hole)
92: Third partition wall (second partition wall)
94: Sixth communication hole (fourth communication hole)
118: Partition wall 120: Space 122: Communication hole 206: Gap

Claims (6)

A part of a case that accommodates a transmission mechanism and a valve body that is positioned to the side of the transmission mechanism, and a valve of a vehicle transmission that is positioned on a side surface of the case with the valve body being spaced from the transmission mechanism Body cover,
The valve body cover is formed in a flat plate shape having a predetermined depth, and an upper wall portion in which a breather discharge port is formed vertically above in a vehicle-mounted state, a cover wall portion facing the valve body, A pair of opposing wall portions located at both end portions of the upper wall portion and facing each other,
A first partition wall is formed on the inner wall surface of the cover wall portion so as to project from the inner wall surface of the cover wall portion toward the valve body side and continue from one of the pair of opposing wall portions toward the other. And
On the valve body side of the first partition wall, a plate or a valve body forming a first space surrounded by the upper wall portion, the cover wall portion, the pair of opposing wall portions, and the first partition wall is disposed. And
The first partition wall is formed with a first communication hole that communicates the first space and the inside of the case at a position that does not overlap with the breather discharge port in the vertical direction in the vehicle-mounted state .
In the first space, a partition wall having a cross-sectional honeycomb structure extending from the cover wall portion toward the valve body side and partitioning the first space is formed,
A valve body cover for a vehicle transmission , wherein the partition wall is formed with a communication hole communicating with a space partitioned by the partition wall . A part of a case that accommodates a transmission mechanism and a valve body that is positioned to the side of the transmission mechanism, and a valve of a vehicle transmission that is positioned on a side surface of the case with the valve body being spaced from the transmission mechanism Body cover,
The valve body cover is formed in a flat plate shape having a predetermined depth, and an upper wall portion in which a breather discharge port is formed vertically above in a vehicle-mounted state, a cover wall portion facing the valve body, A pair of opposing wall portions located at both end portions of the upper wall portion and facing each other,
A first partition wall is formed on the inner wall surface of the cover wall portion so as to project from the inner wall surface of the cover wall portion toward the valve body side and continue from one of the pair of opposing wall portions toward the other. And
On the valve body side of the first partition wall, a plate or a valve body forming a first space surrounded by the upper wall portion, the cover wall portion, the pair of opposing wall portions, and the first partition wall is disposed. And
The first partition wall is formed with a first communication hole that communicates the first space and the inside of the case at a position that does not overlap with the breather discharge port in the vertical direction in the vehicle-mounted state.
In a vehicle-mounted state, at least one vertically projecting from the inner wall surface of the cover wall portion toward the valve body side and continuing from one of the pair of opposing wall portions to the other is vertically below the first partition wall. Two second partitions are formed,
On the valve body side of the second partition, the plate or the valve body forming the second space surrounded by the first partition, the cover wall, the pair of opposing walls, and the second partition Has been placed,
The second partition wall is formed with a second communication hole communicating with the inside of the case or the adjacent second space, respectively.
The first communication hole and the second communication hole that are adjacent to each other are formed at positions that do not overlap with each other in the vertical direction in the in-vehicle state,
A gap is formed between at least one of the first partition and the second partition and the plate or the valve body, and the gap is clogged when the inside of the case is hot. Valve body cover for vehicle transmission. Between the upper wall portion and the first partition, at least one first partition wall is formed that connects between them and partitions the first space,
The connection part of the said 1st partition wall and the said 1st partition is formed with the 3rd communication hole which connects the said 1st space partitioned off by the said 1st partition wall, The Claim 2 characterized by the above-mentioned. Valve body cover for vehicle transmission. In the second space, at least one second partition wall is provided between the first partition wall and the second partition wall or between the adjacent second partition walls to partition the second space. And
A fourth communication hole that communicates with the second space partitioned by the second partition wall is formed at a connection portion with the second partition wall that is positioned on the vertically lower side in the vehicle-mounted state of the second partition wall. The valve body cover for a vehicle transmission according to claim 2. A gap is formed between the partition wall and the plate or the valve body,
The valve body cover for a vehicle transmission according to claim 1 , wherein the gap is clogged when the inside of the case is hot. 6. The valve body cover for a vehicle transmission according to claim 1 , wherein the valve body cover is formed of a resin material.

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