JP4798054B2 - Oil leakage prevention structure - Google Patents

Description

  The present invention relates to an oil leakage prevention structure, and more particularly to an oil leakage prevention structure that prevents oil scooped up by an oil supply member such as a ring gear of a transmission from leaking to the outside from a communication member such as a breather.

Conventionally, as this type of oil leakage prevention structure, the amount of oil splashed and scattered by the ring gear of the transmission is reduced by an oil separator, and an oil plate is provided in the vicinity of the breather. There has been known one in which the scattered oil is prevented from approaching the breather and prevented from leaking out of the breather (see, for example, Patent Document 1).
JP 2005-140321 A

  However, in the conventional oil leakage prevention structure, since the oil separator is provided in the lower part of the ring gear, the oil returning from each part in the housing of the transmission stays in the lower part of the ring gear, and the oil accumulates in the oil separator. There has been a problem that the oil separator is not sufficiently controlled by the oil separator. For this reason, oil that has been scattered and foamed by the rotation of the ring gear of the transmission reaches the vicinity of the breather, passes through the gap of the oil plate, leaks out of the breather, and leaks out of the oil plate. Oil leakage prevention function is not enough. When the oil inside the transmission leaks to the outside as described above, the oil decreases, and there is a problem that the inside of the transmission cannot be smoothly lubricated.

  An object of the present invention is to solve the conventional problems as described above and achieve the following objects. That is, the present invention can sufficiently rectify the flow of the oil scraped up by an oil supply member such as a ring gear, and the oil is not leaked to the outside from a communication member such as a breather. An object of the present invention is to provide an oil leakage prevention structure in which a lubricating element is smoothly lubricated.

In order to achieve the above object, the oil leakage prevention structure according to the present invention includes: (1) a housing in which an oil reservoir is formed, and a housing that is rotatably provided in the housing; A ring gear to be supplied to the element, a communication member provided in the housing and communicating between the inside of the housing and the outside of the housing, and a predetermined component of a transmission provided between the ring gear and the communication member; The lubricating element comprises at least one or more gears that directly or indirectly mesh with the ring gear, and through the air flow passage defined by the outer periphery of the component and the inner periphery of the housing provided from the communication member to a transmission, it constituted so as to discharge the air in the housing, scooped up by the ring gear Yl is an oil leak prevention structure so as to prevent the leaking out from the communicating member, wherein the component is made from the oil pump for supplying oil to the control target of the transmission, opposite to the ring gear An oil rectifying member for rectifying the oil is provided on the outer peripheral portion of the oil pump so that the oil scraped up by the ring gear returns to the oil reservoir.

With this configuration, when the ring gear rotates, oil is scraped up from the oil reservoir to the upper portion of the housing by the tooth tip portion of the ring gear. As oil is scooped up from the oil sump, it is supplied to at least one or more gears that mesh directly or indirectly with the ring gears to lubricate these gears. Further, the remaining oil that has been scraped up from the oil reservoir and supplied to the lubricating element and the oil that returns from the lubricating element are rectified by an oil rectifying member provided on the outer periphery of the oil pump of the transmission, and most of the oil is oil. Reflux to the pool. When most of the oil is returned to the oil reservoir, it flows downward along the outer periphery of the oil pump disposed opposite to the ring gear as in the conventional case, and the foamed oil flows into the air flow passage. Thus, no leakage from the communication member occurs, and the lubricating element inside the transmission is smoothly lubricated.

The oil leakage prevention structure having the configuration described in (1) above includes: (2) a first rectification unit in which the oil rectification member is disposed to face the ring gear; and the first rectification unit extending from the first rectification unit. A second rectifying unit disposed opposite to the ring gear, and at least one of the first rectifying unit and the second rectifying unit is formed to have a predetermined radius of curvature and to face the ring gear. A curved surface and a flat surface formed to face the ring gear.

  With this configuration, for example, the oil rectifying member has a curved surface that has a predetermined radius of curvature at the first rectifying portion and is formed to face the ring gear, and a flat surface that is formed to face the ring gear at the second rectifying portion. The remaining oil that has been scraped up from the oil reservoir by the rotation of the ring gear and supplied to each lubricating element, and the oil that returns from each lubricating element flows downward along the curved surface of the first rectifying unit. Furthermore, since it flows downward along the flat surface of the second rectifying unit, most of it flows back to the oil reservoir.

  According to the present invention, the flow of the oil scraped up by the oil supply member such as the ring gear can be sufficiently rectified, and the oil is not leaked to the outside from the communication member such as the breather. The lubrication element is lubricated smoothly.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
Hereinafter, an example in which the oil leakage prevention structure of the present invention is applied to a transaxle of an automobile will be described.
FIG. 1 is a perspective view of an oil leakage prevention structure according to a first embodiment of the present invention, showing a state in which a ring gear and a transaxle housing are disassembled, and FIG. 2 is a first embodiment of the present invention. It is a front view of the oil leakage prevention structure which concerns on this, (a) shows the state which removed the transaxle housing, (b) is a side view of (a).

First, the configuration will be described.
As shown in FIG. 1, the oil leakage prevention structure 10 according to the first exemplary embodiment of the present invention includes a ring gear 11, a transaxle case 12, a transaxle housing 13, an oil pump 14, and an oil rectifying member 15. And composed of

  The ring gear 11 is composed of a differential ring gear fixed to a differential case 22, and the differential case 22 is held by a drive shaft 23. The drive shaft 23 is rotatably held by the transaxle case 12. Further, the ring gear 11 is adapted to scoop up the oil L staying in the oil reservoir 21 upward by rotation thereof. The oil reservoir 21 is defined by a lower inner wall surface 12a of the transaxle case 12 and an inner peripheral portion 13c of the transaxle housing 13. The oil reservoir 21 is rectified and recirculated by the oil rectifying member 15. Oil L is accumulated. It should be noted that if the amount of oil L stored in the oil reservoir 21 is large, resistance to rotation of the ring gear 11 is caused, so that an amount necessary for lubrication is appropriately stored.

  The transaxle case 12 is made of, for example, aluminum die casting and constitutes a part of a known transaxle. This transaxle is an integrated transmission and front wheel differential, and includes a torque converter. Engine power is transmitted to the transmission via the torque converter, and the front wheel and rear wheels are transmitted through the transmission. Power is distributed to the side, and power is transmitted to the front wheels via a differential on the front wheel side. Inside the transaxle case 12, there are an oil pump 14, a continuously variable transmission mechanism (CVT) composed of a pair of pulleys and a metal belt (not shown), a reduction gear, a final gear, a differential mechanism, and other power. A transmission device is accommodated.

  The transaxle case 12 has a side wall portion 16. The side wall portion 16 is a continuously variable transmission that is a control target of the space 38 on the side where the oil pump 14 is accommodated in the transaxle case 12 and the transmission. A space 39 on the side where the machine or the like is accommodated and the breather 32 is formed is separated from each other, and each shaft such as the drive shaft 23 is held via a bearing. In addition, a plurality of communication holes 12 b for communicating the space 38 and the space 39 are formed in the side wall portion 16, and air circulation in the space 38 and the space 39 is intended. The space 38 is defined by a part of the transaxle case 12 and the interior of the transaxle housing 13, and the space 39 is formed by a part of the transaxle case 12 and the transaxle rear case 33. It is defined.

  The side wall portion 16 of the transaxle case 12 holds a drive shaft 23 at the lower portion of the transaxle case 12, and the ring gear 11 is connected to the drive shaft 23 via a differential case 22. Further, the side wall portion 16 of the transaxle case 12 holds a counter shaft 25 above the ring gear 11, and a reduction driven gear 27 and a differential drive pinion gear 26 are connected to the counter shaft 25, and the reduction driven gear 27 is The differential drive gear 31 meshes with the reduction gear 31 and the differential drive pinion gear 26 meshes with the ring gear 11. Further, the side wall portion 16 of the transaxle case 12 holds a secondary shaft 29 at a position facing the differential drive pinion gear 26, and a reduction drive gear 31 is connected to the secondary shaft 29, and the reduction drive gear 31 is connected to the differential drive pinion gear 26. The drive pinion gear 26 is engaged.

  Further, the side wall portion 16 of the transaxle case 12 holds an input shaft 24 at a position facing the ring gear 11, and the input shaft 24 is connected to the above-described continuously variable transmission mechanism. In this continuously variable transmission mechanism, a pair of pulleys, a primary pulley connected to the input shaft 24 and a secondary pulley connected to the secondary shaft 29, are connected by a metal belt in accordance with the traveling state of the automobile. By adjusting the groove width of the secondary pulley and the secondary pulley, the effective radius at which the primary pulley and the secondary pulley contact the metal belt is changed, and the rotation speed of the primary pulley and the secondary pulley is changed steplessly, that is, the shift is executed. By doing so, the secondary shaft 29 is set to a predetermined rotational speed.

  Further, a breather 32 is formed in the upper surface portion 12c of the transaxle case 12 so as to penetrate the upper surface portion 12c of the transaxle case 12, and the high temperature and high pressure are generated in the transaxle case 12 and the transaxle housing 13. The discharged air is discharged to the outside so that a pressure difference between the pressure in the transaxle case 12 and the transaxle housing 13 and the external pressure does not occur.

  A flange 12d is formed around one end of the transaxle case 12, and a through hole 12e is formed in the flange 12d. A fixing bolt 35 is inserted into the through hole 12e. A transaxle housing 13 is attached to the flange 12d of the transaxle case 12, and a space 38 is defined by the transaxle case 12 and the transaxle housing 13 as described above.

  As shown in FIG. 2B, a transaxle rear case 33 is attached to the rear portion of the transaxle case 12 by a fixing bolt (not shown). The transaxle rear case 33 is attached to the input shaft 24. The end portion and the end portion of the secondary shaft are rotatably supported via a bearing.

  The transaxle housing 13 is made of the same aluminum die-cast as the transaxle case 12, and a flange 13b is formed around the side surface portion 13a of the transaxle housing 13, and a through hole 13d is formed in the flange 13b. Has been. A fixing bolt 35 is inserted into the through hole 13 d, and the transaxle housing 13 is fixed to the transaxle case 12 by the fixing bolt 35.

  The oil pump 14 includes a pump case 17, a pump cover 18, and a pump body 19.

  The pump case 17 has an annular wall 17a formed in a cylindrical shape protruding from the side wall portion 16 at a predetermined height, and an attachment for fixing the pump case 17 to an end portion of the annular wall 17a. A plurality of holes are formed.

  The pump cover 18 is formed in a disc shape, and a flange 18b having a through hole 18a is formed at one end. A mounting screw (not shown) is inserted into the through hole 18 a and is screwed into the mounting hole of the pump case 17 so that the pump cover 18 is fixed to the pump case 17. A recess (not shown) for mounting the pump body 19 is formed on the side surface of the pump cover 18, and the pump body 19 is accommodated in the recess.

  The pump body 19 is a pump that sucks and discharges oil, such as a gear pump and a trochoid pump, and is housed in a recess of the pump cover 18, fixed to the input shaft 24, and rotated together with the input shaft 24. ing. Since the input shaft 24 is connected to an output shaft of an internal combustion engine, for example, an engine, the pump body 19 is driven in synchronization with the rotation of the engine and rotates within the pump cover 18.

  Further, in a space 38 defined between the transaxle housing 13 and the transaxle case 12, an outer peripheral portion 17c of the annular wall 17a, an inner peripheral portion 12f of the transaxle case 12, and an inner portion of the transaxle housing 13 are arranged. Air flow passages E1, E2, and E3 are defined by the peripheral portion 13c.

  The air flow passage E1 is formed between the tooth tip surface portion 11a of the ring gear 11 and the outer peripheral portion 17c of the annular wall 17a of the pump case 17 disposed to face the tooth tip surface portion 11a and the inner peripheral portion 13c of the transaxle housing 13. Including a boundary portion between the space 41 and the air flow passage defined between them, that is, an inlet portion of the air flow passage, an inner peripheral portion 12f of the transaxle case 12, a lower outer peripheral portion 17d of the annular wall 17a, and a transaxle housing It is defined between 13 inner peripheral portions 13c. This inlet portion is formed by a gap between the rib 12i of the transaxle case 12 and the outer peripheral portion 17c, and air in the space 41 flows into the air flow passage E1 from this inlet portion.

  The air flow passage E2 is defined between the outer peripheral portion 17c and the inner peripheral portion 12g of the annular wall 17a and the inner peripheral portion 13c of the transaxle housing 13, and the air flow passage E3 is defined by the outer peripheral portion of the annular wall 17a. 17c, the inner peripheral portion 12h, and the inner peripheral portion 13c of the transaxle housing 13 are defined. Since the air in the spaces 38 and 41 is discharged from the breather 32 via the air flow passages E1 to E3, if the air flow passages E1 to E3 are closed, the air in the spaces 38 and 41 is Since it will be discharged | emitted from the breather 32 through another path | route and internal oil L may leak from the breather 32, air always distribute | circulates in the air flow paths E1-E3. .

  The oil pump 14 has a suction port (not shown), and one end thereof is connected to a suction oil passage communicating with the oil storage chamber of the oil pan 36. The oil pump 14 has a discharge port (not shown), and one end of the oil pump 14 is connected to a discharge oil passage communicating with the oil supply port of the valve body 34 as a transmission control target. With this configuration, the oil pump 14 sucks the oil L in the oil storage chamber and supplies the sucked oil L to the oil supply port of the valve body 34. The oil L supplied to the valve body 34 is further supplied via the valve body 34 to lubricating elements such as shafts, bearings, and gears housed in the space 39 in the transaxle case 12. ing. The oil L supplied to the lubrication element is then returned to the oil pan 36 and the oil reservoir 21 of the transaxle case 12.

  The breather 32 includes a through-hole penetrating the upper surface portion 12c of the transaxle case 12, and communicates the inside of the transaxle case 12, the inside of the transaxle housing 13, and the outside thereof. The breather 32 discharges the air that has become high temperature and high pressure in the transaxle case 12 and the transaxle housing 13 to the outside, so that the pressure and the external pressure in the transaxle case 12 and the transaxle housing 13 can be reduced. The pressure difference is prevented from occurring.

  FIG. 3 is a perspective view of the oil rectifying member in the oil leakage prevention structure according to the first embodiment of the present invention, wherein (a) shows a state where the rectifying portion is formed of a curved surface, and (b) Indicates a state where the rectifying part is formed of a curved surface having a notch.

As shown in FIG. 3A, the oil rectifying member 15 is made of metal or plastic, and includes a rectifying portion 15a and a mounting portion 15b, and is fixed to the outer peripheral portion 17c of the annular wall 17a of the pump case 17. Has been. The rectifier unit 15a, and the radius of curvature r ₁ smoothly curved surface 15c is a surface formed by centered on P _1, and is extended Mashimashi formed by flat surface surface to the curved surface 15c smooth flat surface 15d have. The oil L that has flowed into the curved surface 15c is guided to the flat surface 15d so as to flow smoothly in the direction of the arrow B, and is further guided below the flat surface 15d. Here, the radius of curvature refers to the approximate radius of a circle when the degree of local bending in a curve is approximated to a circle.

The position of P ₁ and the size of the radius of curvature r ₁ can be arbitrarily selected according to the vehicle type, the engine, and other conditions, for example, the flow rate of the oil L in the transaxle case 12. The position of the P ₁ is, for example, may be the same position as the axial center of the drive shaft 23.

The mounting portion 15b is formed with a curved surface having a radius of curvature r ₂ around the P _2, the mounting portion 15b is adapted to be in contact fixed to the outer peripheral portion 17c of the annular wall 17a Yes. The position of the center P ₂ is preferably set to coincide with the center position of the input shaft 24, the radius of curvature r ₂ is preferably the same as the radius of the outer peripheral portion 17c of the annular wall 17a. Thus, the position of the center P ₂ is coincident with the center position of the pump body 19, the radius of curvature r _2, When it is equal to the radius of the outer peripheral portion 17c, the shape of the inner wall surface and the outer peripheral portion 17c of the mounting portion 15b Therefore, the oil rectifying member 15 can be easily attached to the pump case 17 and can be stably fixed with a wide attachment area.

The height H ₂ of the oil flow control member 15 is formed a height H ₁ and the same or slightly lower in the annular wall 17a. The thickness t ₁ of the central portion of the oil flow control member 15, vehicle type and the engine other conditions, for example, may be arbitrarily selected in accordance with such a flow rate of the oil L in the transaxle casing 12.

  Further, as shown in FIG. 3 (b), a notch 15e is formed in the attachment portion 15b, and the upper portion and the lower portion of the attachment portion 15b are brought into contact with the outer peripheral portion 17c of the annular wall 17a. The portion 15b and the outer peripheral portion 17c may be easily joined and reduced in weight.

Hereinafter, the operation of the oil leakage prevention structure 10 according to the first exemplary embodiment of the present invention will be described.
As shown in FIGS. 1 and 2A, when rotational torque is transmitted from the engine output shaft to the input shaft 24, the input shaft 24 rotates counterclockwise and is connected to the input shaft 24. Rotational torque is transmitted to the continuously variable transmission mechanism. That is, the rotational torque is transmitted to the primary pulley connected to the input shaft 24, and the rotational torque transmitted to the primer pulley is transmitted to the secondary pulley connected to the secondary shaft 29 via the metal belt. Rotate clockwise at a predetermined speed. In this continuously variable transmission mechanism, gear shifting is automatically and continuously executed in accordance with the running state of the automobile.

  When the secondary shaft 29 rotates in the clockwise direction, the reduction drive gear 31 connected to the secondary shaft 29 rotates in the clockwise direction, and at the same time the reduction driven gear 27 meshed with the reduction drive gear 31 rotates in the counterclockwise direction. The differential drive pinion gear 26 rotates counterclockwise, and the ring gear 11 engaged with the differential drive pinion gear 26 rotates in the direction of arrow A.

  FIG. 4 is a perspective view of the oil leakage prevention structure according to the first embodiment of the present invention, where (a) shows the oil flow with the transaxle housing removed, and (b) It is an enlarged view of the C arrow part of (a).

  As shown in FIGS. 4A and 4B, when the ring gear 11 rotates in the direction of arrow A, the oil L staying in the oil reservoir 21 is scraped up by the tooth tip surface portion 11a of the ring gear 11, and the countershaft 25 The differential drive pinion gear 26, the reduction driven gear 27, the secondary shaft 29, and the reduction drive gear 31 are supplied and lubricated. The remaining oil L supplied to these lubrication elements and the oil L flowing through the lubrication elements in the lower direction of the transaxle case 12 are in a space 41 defined between the annular wall 17a and the ring gear 11. To flow. The oil L that has flowed into the space 41 is guided downstream along the curved surface 15 c of the oil rectifying member 15, and most of the oil L is returned to the oil reservoir 21 below the ring gear 11 along the flat surface 15 d. When most of the oil L is returned to the oil reservoir 21, it is led from the space 41 through the air flow passages E1, E2 and E3 to the breather 32 and leaks out of the breather 32 as in the conventional case. And the inside of the transmission is smoothly lubricated by the required amount of oil L.

  The ring gear 11 in the present embodiment constitutes the oil supply member in the present invention, the transaxle case 12 and the transaxle housing 13 constitute the housing in the present invention, and the oil pump 14 is the transmission of the transmission in the present invention. The differential drive pinion gear 26, the reduction driven gear 27, and the reduction drive gear 31 constitute a predetermined lubricating element in the present invention, and the breather 32 constitutes a communicating member in the present invention.

(Second Embodiment)
FIG. 5 is a perspective view of an oil rectifying member in the oil leakage prevention structure according to the second embodiment of the present invention, wherein (a) shows a state where the rectifying portion is formed by a curved surface, and (b) Indicates a state where the rectifying part is formed of a curved surface having a notch.

  In addition, in the oil leakage prevention structure 50 which concerns on 2nd Embodiment, although the oil rectification | straightening member 15 in 1st Embodiment differs, the other structure is comprised similarly. Therefore, the same configuration will be described using the same reference numerals as those in the first embodiment shown in FIGS. 1 to 4A and 4B, and only differences will be described in detail.

  First, the configuration will be described. Similar to the oil leakage prevention structure 10 in the first embodiment shown in FIGS. 1 and 2 (a) and 2 (b), the oil leakage prevention structure 50 according to the second embodiment of the present invention is provided with an oil supply. The member 11, the transaxle case 12, the transaxle housing 13, the oil pump 14, and the oil rectifying member 51 are configured.

  As shown in FIGS. 5A and 5B, the oil rectifying member 51 is made of metal, plastic, or the like, and includes a rectifying portion 51 a and a mounting portion 51 b, and the outer periphery of the annular wall 17 a of the pump case 17. It is fixed to the part 17c. The rectifying portion 51a protrudes from the outer peripheral portion 17c of the annular wall 17a, and is formed of a flat surface and has a smooth surface, and extends to the first flat surface 51c. The formed flat surface inclined at an angle θ with respect to the first flat surface 51c has a smooth second flat surface 51d. The oil L that has flowed into the first flat surface 51c is guided to the second flat surface 51d so as to flow smoothly in the direction of the arrow D, and is further guided below the second flat surface 51d. . The position and size of the first flat surface 51c and the second flat surface 51d and the size of the angle θ correspond to the vehicle type, the engine and other conditions, for example, the flow rate of the oil L in the transaxle case 12. Can be arbitrarily selected.

The mounting portion 51b, as in the first embodiment, is formed by a curved surface having a radius of curvature r ₂ around the P _2, the mounting portion 51b is an annular wall 17a of the pump casing 17 The outer peripheral portion 17c is abutted and fixed.
The height H ₂ of the oil flow control member 51 is formed a height H ₁ and the same or slightly lower in the annular wall 17a. The thickness t ₂ of the central portion of the oil flow control member 51, vehicle type and the engine other conditions, for example, may be arbitrarily selected in accordance with such a flow rate of the oil L in the transaxle casing 12.

  Further, as shown in FIG. 5 (b), a notch 51e is formed in the mounting part 51b, and the upper part and the lower part of the mounting part 51b are brought into contact with the outer peripheral part 17c of the annular wall 17a. The portion 51b and the outer peripheral portion 17c may be easily joined and reduced in weight.

  The oil leakage prevention structure 50 according to the second embodiment of the present invention operates in the same manner as the oil leakage prevention structure 10 according to the first embodiment. That is, the oil L supplied into the space 41 is guided downstream along the first flat surface 51 c of the oil rectifying member 51, and most of the oil L is further below the ring gear 11 along the second flat surface 51 d. Is returned to the oil reservoir 21. When most of the oil L is returned to the oil reservoir 21, it is led from the space 41 through the air flow passages E1, E2 and E3 to the breather 32 and leaks out of the breather 32 as in the conventional case. And the inside of the transmission is smoothly lubricated by the required amount of oil L.

(Third embodiment)
FIG. 6 is a perspective view of the oil rectifying member in the oil leakage prevention structure according to the third embodiment of the present invention, wherein (a) shows a state where the rectifying portion is formed with a flat surface, and (b) Indicates a state where the rectifying portion is formed of a flat surface having a notch.

  In addition, in the oil leakage prevention structure 60 which concerns on 3rd Embodiment, although the oil rectification | straightening member 15 in 1st Embodiment differs, the other structure is comprised similarly. Therefore, the same configuration will be described using the same reference numerals as those in the first embodiment shown in FIGS. 1 to 4A and 4B, and only differences will be described in detail.

  First, the configuration will be described. Similar to the oil leakage prevention structure 10 in the first embodiment shown in FIGS. 1 and 2 (a) and 2 (b), the oil leakage prevention structure 60 according to the third embodiment of the present invention is provided with an oil supply. The member 11, the transaxle case 12, the transaxle housing 13, the oil pump 14, and the oil rectifying member 61 are configured.

As shown in FIGS. 6A and 6B, the oil rectifying member 61 is made of metal, plastic, or the like, and includes a rectifying portion 61a and a mounting portion 61b, and the outer periphery of the annular wall 17a of the pump case 17 It is fixed to the part 17c. The rectifying portion 61a protrudes from the outer peripheral portion 17c of the annular wall 17a, and a smooth flat surface 61c is a surface formed by the flat surface extends to the flat surface 61c, the radius of curvature r ₃ around the P ₃ And a curved surface 61d having a smooth surface. The oil L that has flowed into the flat surface 61c is guided to the curved surface 61d so as to flow smoothly in the direction of arrow E, and is further guided below the curved surface 61d.
The position of the center P ₃ and the size of the curvature radius r ₃ can be arbitrarily selected according to the vehicle type, the engine, and other conditions, for example, the flow rate of the oil L in the transaxle case 12.

The mounting portion 61b, as in the first embodiment, is formed by a curved surface having a radius of curvature r ₂ around the P _2, the mounting portion 61b is an annular wall 17a of the pump casing 17 The outer peripheral portion 17c is abutted and fixed.
The height H ₂ of the oil flow control member 51 is formed a height H ₁ and the same or slightly lower in the annular wall 17a. Further, the thickness t ₃ of the central portion of the oil rectifying member 51 can be arbitrarily selected in accordance with the vehicle type, the engine, and other conditions, for example, the flow rate of the oil L in the transaxle case 12.
Further, as shown in FIG. 6B, similarly to the first embodiment, a notch 61e is formed in the mounting portion 61b, and the upper and lower portions of the mounting portion 61b are arranged at the outer periphery of the annular wall 17a. By abutting on the portion 17c, the attachment portion 61b and the outer peripheral portion 17c may be easily joined and reduced in weight.

  The oil leakage prevention structure 60 according to the third embodiment of the present invention operates similarly to the operation of the oil leakage prevention structure 10 according to the first embodiment. That is, the oil L supplied into the space 41 is guided downstream along the flat surface 61 c of the oil rectifying member 61, and most of the oil L returns to the oil reservoir 21 below the ring gear 11 along the curved surface 61 d. Is done. When most of the oil L is returned to the oil reservoir 21, it is led from the space 41 through the air flow passages E1, E2 and E3 to the breather 32 and leaks out of the breather 32 as in the conventional case. And the inside of the transmission is smoothly lubricated by the required amount of oil L.

(Fourth embodiment)
FIG. 7 is a perspective view of an oil rectifying member in an oil leakage prevention structure according to a fourth embodiment of the present invention, and (a) shows a state where the rectifying portion is formed integrally with the oil pump case. , (B) shows a state where the rectifying part is formed of a curved surface having a groove.

  In addition, in the oil leakage prevention structure 70 which concerns on 4th Embodiment, although the oil rectification | straightening member 15 in 1st Embodiment differs, the other structure is comprised similarly. Therefore, the same configuration will be described using the same reference numerals as those in the first embodiment shown in FIGS. 1 to 4A and 4B, and only differences will be described in detail.

  First, the configuration will be described. Similar to the oil leakage prevention structure 10 in the first embodiment shown in FIGS. 1 and 2 (a) and 2 (b), the oil leakage prevention structure 70 according to the fourth embodiment of the present invention is provided with an oil supply. The member 11, the transaxle case 12, the transaxle housing 13, the oil pump 14, and the oil rectifying member 71 are configured.

As shown in FIGS. 7A and 7B, the oil rectifying member 71 is formed integrally with the annular wall 17a of the pump case 17, and has a rectifying portion 71a formed protruding from the annular wall 17a. is doing. The rectifying unit 71a, the surface is formed with a radius of curvature r ₄ around the P ₄ has a smooth curved surface 71b. The oil L flowing into the upper part of the curved surface 71b is guided to the lower part of the curved surface 71b so as to flow smoothly in the direction of arrow F. The position of the center P ₄ and the size of the radius of curvature r ₄ can be arbitrarily selected according to the vehicle type, the engine, and other conditions, for example, the flow rate of the oil L in the transaxle case 12.

  The back surface portion 71c of the oil rectifying member 71 constitutes an inner wall portion of the annular wall 17a because the oil rectifying member 71 is formed integrally with the annular wall 17a.

The height H ₂ of the oil flow control member 71 is formed with a height H ₁ the same height as the annular wall 17a. Further, the thickness t ₄ of the central portion of the oil rectifying member 71 can be arbitrarily selected in accordance with the vehicle type, the engine, and other conditions, for example, the flow rate of the oil L in the transaxle case 12.

  Further, as shown in FIG. 7B, as in the first embodiment, the groove 71d is formed in the lower portion of the oil rectifying member 71 to make the wall thickness uniform, thereby improving the moldability. The weight may be reduced.

  The oil leakage prevention structure 70 according to the fourth embodiment of the present invention operates similarly to the operation of the oil leakage prevention structure 10 according to the first embodiment. That is, the oil L supplied into the space 41 is guided downstream along the upper portion of the curved surface 71b of the oil rectifying member 71, and most of the oil L along the lower portion of the curved surface 71b is oil below the ring gear 11. It is returned to the reservoir 21. When most of the oil L is returned to the oil reservoir 21, it is led from the space 41 through the air flow passages E1, E2 and E3 to the breather 32 and leaks out of the breather 32 as in the conventional case. And the inside of the transmission is smoothly lubricated by the required amount of oil L.

In the present embodiment, the case where the oil leakage prevention structure is applied to a transaxle of an automobile has been described. However, in the present invention, an automatic or manual transmission, a differential device, or the like that uses the oil leakage prevention structure for an internal combustion engine. The present invention can be applied to a power transmission device that is lubricated by the lubricating oil.
The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the oil leakage prevention structure according to the present invention can sufficiently rectify the flow of oil scraped up by the differential ring gear, so that the oil is not leaked from the breather to the outside, and the inside of the transmission is smooth. And is useful for transmissions such as an automatic transmission, a manual transmission, a continuously variable transmission (CVT), and a transaxle.

1 is a perspective view of an oil leakage prevention structure according to a first embodiment of the present invention, showing a state in which a ring gear and a transaxle housing are disassembled. It is a front view of the oil leakage prevention structure which concerns on the 1st Embodiment of this invention, (a) shows the state which removed the transaxle housing, (b) is a side view of (a). It is a perspective view of the oil rectification member in the oil leakage prevention structure which concerns on the 1st Embodiment of this invention, (a) shows the state in which the rectification | straightening part was formed in the curved surface, (b) is a rectification | straightening part. Shows a state formed by a curved surface having a notch. It is a perspective view of the oil leakage prevention structure which concerns on the 1st Embodiment of this invention, (a) shows the flow of the oil in the state which removed the transaxle housing, (b) is (a). It is an enlarged view of the C arrow part. It is a perspective view of the oil rectification member in the oil leakage prevention structure which concerns on the 2nd Embodiment of this invention, (a) shows the state in which the rectification | straightening part was formed in the curved surface, (b) is a rectification | straightening part. Shows a state formed by a curved surface having a notch. It is a perspective view of the oil rectification member in the oil leakage prevention structure which concerns on the 3rd Embodiment of this invention, (a) shows the state in which the rectification | straightening part was formed in the flat surface, (b) is a rectification | straightening part. Shows a state formed by a flat surface having a notch. It is a perspective view of the oil rectification member in the oil leakage prevention structure which concerns on the 4th Embodiment of this invention, (a) shows the state by which the rectification | straightening part was integrally formed with the oil pump case, (b) Indicates a state where the rectifying part is formed of a curved surface having a groove.

Explanation of symbols

10, 50, 60, 70 Oil leakage prevention structure 11 Ring gear (oil supply member)
12 Transaxle case (housing)
12f, 13c Inner circumference 13 Transaxle housing (housing)
14 Oil pump (component)
15, 51, 61, 71 Oil rectification member 15c, 61d Curved surface (first rectification unit)
15d, 61c Flat surface (second rectification unit)
16 Side wall portion 17 Pump case 17c Outer peripheral portion 18 Pump cover 19 Pump body 21 Oil reservoir 22 Differential case 23 Drive shaft 24 Input shaft 25 Counter shaft 26 Differential drive pinion gear (lubricating element)
27 Reduction Driven Gear (Lubricating Element)
29 Secondary shaft 31 Reduction drive gear (lubrication element)
32 breather (communication member)
51c 1st flat surface (1st rectification | straightening part)
51d 2nd flat surface (2nd rectification | straightening part)
E1-E3 Air flow passage

Claims (2)

A housing in which an oil sump is formed;
A ring gear which is rotatably provided in the housing and scrapes up the oil in the oil reservoir and supplies the oil to a predetermined lubricating element;
A communication member that is provided in the housing and communicates between the inside of the housing and the outside of the housing;
A predetermined component of a transmission provided between the ring gear and the communication member;
The lubricating element comprises at least one or more gears that mesh directly or indirectly with the ring gear;
Provided in a transmission configured to discharge air in the housing from the communication member through an air flow passage defined by an outer peripheral portion of the component and an inner peripheral portion of the housing, and is scraped up by the ring gear An oil leakage prevention structure that prevents the oil obtained from leaking outside from the communication member,
The component consists of an oil pump that supplies oil to the controlled object of the transmission,
An oil leakage prevention structure characterized in that an oil rectifying member for rectifying oil is provided on an outer peripheral portion of the oil pump so as to face the ring gear so that the oil scraped up by the ring gear returns to the oil reservoir. . The oil rectifying member includes a first rectifying portion disposed to face the ring gear, and a second rectifying portion extending from the first rectifying portion and disposed to face the ring gear. At least one of the first rectifying unit and the second rectifying unit is either a curved surface having a predetermined radius of curvature and formed to face the ring gear, or a flat surface formed to face the ring gear. oil leakage preventing structure according to claim 1, characterized in that it has.