JP2007321928A - Air breather structure of transmission case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To trim down a transmission case by simplifying a complicated communicating structure in exhausting gas in the transmission case without jetting oil filled in the transmission case. <P>SOLUTION: This air breather structure of the transmission case 100 comprises an air breather chamber 1 having an inlet 2 opened into the transmission case 100, near the mating faces of two cases 110, 120 forming the transmission case 100, and allowing the inlet 2 to communicate with a through hole (n) formed in the transmission case 100. The air breather chamber 1 is provided with a barrier 128d extending from a part, located behind the inlet 2, of a sidewall 123 of the case 120 toward the mating face with the other case 100. An oil inflow impeding region R1 is formed between the barrier 128d and the inlet 2, and a part of the sidewall 113 of the case 110 is brought close to the mating face with the case 120 to form a side shifted sidewall 113a. A narrow part C1 allowing the oil inflow impeding region R1 to communicate with a volume increase region R2 is provided between the side shifted sidewall 113a and the barrier 128d. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention prevents high-temperature and high-pressure oil from being ejected from the through-hole when the through-hole is formed in the transmission case in order to prevent an increase in temperature and pressure in the transmission case. The present invention relates to an air breather structure of a transmission case having a function that can be performed.

  The oil charged together with the transmission mechanism in the transmission case is scraped up by the rotating part of the transmission mechanism and used as lubricating oil for the transmission mechanism. For this reason, the amount of oil that is scooped up during high-speed running increases, and there has been a problem that high-temperature and high-pressure oil is ejected to the outside from a through hole formed in the transmission case for degassing.

Therefore, the conventional technique has an inlet opened in the transmission case in the vicinity of the mating surface of the two split cases forming the transmission case, and the inlet and the through hole formed in the transmission case are mutually connected. There is an air breather structure including at least one air breather chamber (see, for example, Patent Document 1).
Japanese Patent Application No. 6-117521

  However, since the above conventional technology has an air breather structure that is detoured up and down along the mating surface, the structure is complicated, and if the layout of the power transmission system etc. arranged in the space in the case is not changed, the case However, there exists a problem which enlarges along the mating surface.

On the other hand, in another prior art, there is an inlet opened in the transmission case in the vicinity of the mating surface of the two split cases forming the transmission case, and a through hole provided in the transmission case from this inlet. There is one in which the inlet is communicated with the through hole after alternately circulating air breather chambers formed alternately in two split cases toward the hole. (For example, refer to Patent Document 2).
Japanese Patent Application No. 10-205609

  However, in the latter technique, the air breather chambers are alternately arranged, and the portions connecting the air breather chambers are widely open, so that high-temperature and high-pressure gas is mixed in the stirred oil, With this high temperature and high pressure gas, there is a possibility that the oil is jetted to the outside or swells in a bubbled state.

  The injection of oil mixed with high-temperature and high-pressure gas and the expansion of bubbled oil can be eliminated by increasing the volume of the air breather chamber. This influences the layout of the power transmission system and the like arranged in the space, resulting in a new problem that the transmission case becomes large.

  The problem to be solved by the present invention has been made in view of the above-mentioned fact, and without discharging the oil filled in the transmission case, the gas filled in the transmission case is discharged. The purpose is to simplify the complicated air breather structure to make the transmission case slim.

  The present invention provides an air breather having an inlet opened in the transmission case in the vicinity of the mating surface of the two split cases forming the transmission case, and communicating the inlet with a through hole formed in the transmission case. An air breather structure of a transmission case comprising a chamber, wherein the air breather chamber has a barrier extending from a portion located behind the inlet to a mating surface with the other split case, of a side wall of one split case. Providing a region between the barrier and the inlet to prevent the inflow of oil, and bringing a part of the side wall of the other split case close to the mating surface with the one split case A narrow portion is provided between the width-adjusting side wall and the barrier so as to connect the region that prevents inflow of oil to another region located behind the barrier. It is an butterfly.

  In the present invention, it is preferable that the width-adjusting side wall extends from the barrier toward the through hole by a predetermined value.

  In the present invention, the other split case is connected to the width-adjusting side wall, and the side wall adjacent to the through hole is away from the mating surface, and the volume is increased between the side wall of the one split case. It is preferable to be a bulging side wall that forms

  In the present invention, the air breather chamber is provided with an oil splash preventing plate near the inlet, and a first gap is formed between the oil splash preventing plate and the one split case, and the oil splash preventing plate It is preferable that the base is disposed below the width-adjusting side wall, a second gap is formed between the width-adjusting side wall, and the inlet is divided into two systems. Furthermore, in this invention, it is preferable to arrange | position a rotation sensor to the empty space produced by providing the said width-adjusting side wall.

  According to the present invention, when oil mixed with high-temperature and high-pressure gas or bubbled oil enters from the inlet opened in the transmission case, the side wall of one split case is positioned behind the inlet. Most of the barriers are dammed up to the mating surface with the other split case, and in order to penetrate deeper, you must pass through the narrow part formed between the barrier and the side wall. I must. For this reason, at least for the oil mixed with high-temperature and high-pressure gas, most of the intrusion can be prevented in the region formed between the inlet and the barrier.

  Most of the aerated oil is destroyed by the surface tension at the narrow portion. In addition, according to the present invention, another region different from the region that prevents the inflow of oil spreads behind the barrier that has passed through the narrowed portion, so that bubbled oil is not destroyed at the narrowed portion. Even if the vehicle enters, it is liquefied again and returned to the transmission case by being cooled and decompressed as the volume increases in the other region.

  Therefore, according to the present invention, the high-temperature and high-pressure gas filled in the transmission case can be discharged to the outside through the through-hole formed in the transmission case, while the oil mixed with the high-temperature and high-pressure gas is discharged. It is possible to greatly suppress squirting and swelling of bubbled oil.

  Further, in the present invention, the width-adjusting side wall is close to the mating surface with one of the split cases, and accordingly, an open space can be formed in a portion adjacent to the width-adjusting side wall, The transmission case can be made slim. Thereby, if other accessories, such as a sensor, are arrange | positioned in such an empty space, the size reduction of the whole transmission can be achieved.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view illustrating a belt-type continuously variable transmission unit that employs an air breather structure of a transmission case according to the present invention.

Reference numeral 100 denotes a transmission case formed by combining three split cases of a converter case 110, a center case 120, and a side case 130. In this transmission case 100,
A lockup type torque converter 11 connected to a drive source 10 such as an engine or a motor, a forward / reverse switching mechanism 12 connected to the torque converter 11, and a primary pulley 13 connected to the forward / backward switching mechanism 12 are arranged coaxially. 1 axis O1,
A second shaft O2 in which a secondary pulley 15 connected to the primary pulley 13 and the belt 14 and a transmission gear 16 coaxially coupled to the secondary pulley 15 are disposed;
A third axis O3 on which an idler gear 17 meshing with the transmission gear 16 is disposed;
A power transmission system having a four-shaft configuration composed of a fourth shaft O4 provided with a differential mechanism 18 meshing with the idler gear 17 is housed integrally.

  The converter case 110 accommodates the torque converter 11 in the front stage thereof, and a space for accommodating the forward / reverse switching mechanism 12, the transmission gear 16, the idler gear 17, and the differential mechanism 18 between the converter case 110 and the center case 120 that is aligned with the rear surface thereof. Form. Center case 120 is combined with converter case 110 in front of it and forms a space for storing primary pulley 13, belt 14 and secondary pulley 15 between side case 130 and the back case 130.

  Here, the air breather chamber 1 of the transmission case according to the present invention is formed in the vicinity of the mating surface between the converter case 110 and the center case 120.

  As shown in FIG. 2, the converter case 110 has a peripheral wall 111 that surrounds each axis from the first axis O1 to the fourth axis O4 around its axis, and the peripheral wall 111 has an edge facing the center case 120. The flange portion 112 is integrally formed.

  A partition wall 113 that holds the axes O1 to O4 is integrally formed inside the peripheral wall 111. The partition wall 113 is provided with an opening 114 through which a shaft connecting the torque converter 11 and the forward / reverse switching mechanism 12 passes, a recess 115 in which a bearing for holding the transmission gear 16 is attached, and a bearing for holding the idler gear 17. An opening 117 to which a bearing for holding the recess 116 and the final gear 18a of the differential mechanism 18 is attached is formed.

  As shown in FIG. 3, the center case 120 has a peripheral wall 121 that surrounds each of the first axis O1 to the fourth axis O4 around its axis, as with the converter case 110. The peripheral wall 121 has a through-hole n for communicating the inside and the outside of the peripheral wall 121 at a position corresponding to the upper portion of the center case 120, and a flange portion 122 is integrally formed at an edge facing the converter case 110. Yes.

  A partition wall 123 that holds the respective axes O1 to O4 is integrally formed inside the peripheral wall 121. In the partition wall 123, an opening 124 through which a shaft connecting the forward / reverse switching mechanism 12 and the primary pulley 13 passes and a clutch brake is fixed around the shaft 124, an opening 125 holding the input side of the secondary pulley 15, an idler gear 17 A recess 126 to which a bearing for holding the shaft is attached and an opening 127 to which a bearing for holding the final gear 18a of the differential mechanism 18 is attached are formed.

  Further, the inner side of the partition wall 123 of the center case 120 is branched inward from the flange portion 122 so as to surround the through hole n formed in the peripheral wall 121, and has the same height as the flat surface 122f of the flange portion 122. A guide wall 128 is integrally formed.

The guide wall 128 includes a vertical wall 128a that hangs down integrally from the upper part of the center case 120, and a curved wall 128b that is integrally connected to the vertical wall 128a and extends downward along the opening 125. An oil splash preventing plate 128c is integrally formed at the tip. Oil splash prevention plate 128c includes a base portion 128c ₁ leading to the curved wall 128b, leads integral with the base portion 128c _1, barb 128c ₂ of the tip to form a first gap A ₁ between each other with the peripheral wall portion 121 It consists of.

  Further, a barrier 128d extending from the partition wall 123 toward the mating surface with the converter case 110 and having the same height as the flat surface 122f of the flange portion 122 is integrally formed between the curved wall 128b and the flange portion 122. ing.

  On the other hand, inside the partition wall 113 of the converter case 110, as shown in FIG. 2, the flange portion 112 branches from the flange portion 112 to a position facing the guide wall 128 when combined with the center case 120. A guide wall 118 having the same height as the flat surface 112f of 112 is integrally formed.

  The guide wall 118 hangs down integrally from the upper part of the converter case 110 and is joined to the vertical wall 128a of the center case 120, and the curved wall 118b is joined to the vertical wall 118a and joined to the curved wall 128b of the center case 120. In addition, the curved wall 118b is integrally connected, and the inclined wall 118c having a different radius of curvature from the curved wall 118b is integrally connected to the flange portion 112 again.

  Thus, when the converter case 110 and the center case 120 are used as the split case and the flange portions 112 and 122 are combined, the forward / reverse switching mechanism 12 as shown in FIG. A space R for accommodating the transmission gear 16, the idler gear 17 and the differential mechanism 18 is formed, and an air breather chamber 1 as shown in FIGS. 4 and 5 is formed in the vicinity of the mating surface between the converter case 110 and the center case 120. Is done.

  4 is a view showing the air breather chamber 1 from the XX cross section of FIGS. 2 and 3, and FIG. 5 is a perspective cross sectional view of FIG.

  Further, FIG. 6 is an enlarged cross-sectional view of a main part showing the combined state of the converter case 110 and the center case 120 from the YY cross section of FIG.

As shown in FIG. 6, the inclined wall 118c, when combined with the center case 120 is laid so as to be located above the base portion 128c ₁ of the oil splash prevention plate 128c. In this case, since the base portion 128c ₁ is disposed below the width-adjusting side wall 113a, a second gap A ₂ communicating with the air breather structure 1 is formed on the side surface of the oil splash repellent prevention plate 128c.

That is, the air breather chamber 1 uses the peripheral wall 121, the partition wall 123, and the guide wall 128 of the center case 120 as one side wall, the top wall, and the bottom wall, and the peripheral wall 111, the partition wall 113, and the guide wall 118 of the converter case 110. A _first gap A ₁ and a second gap, each of which is defined as the other side wall, top wall, and bottom wall, open to a space R formed between the converter case 110 and the center case 120. has an inlet 2 formed of two systems of a _2.

  Further, the air breather chamber 1 will be described in detail. As shown in FIGS. 4 and 5, a barrier wall 128 d extending from the portion located behind the inlet 2 toward the mating surface with the converter case 110 in the partition wall 123 of the center case 120. Between the inlet 2 and the barrier 128d, an oil inflow prevention region R1 for preventing the inflow of oil is formed.

  In addition, the partition wall 113 of the converter case 110 is provided with a width-adjusting side wall 113a that is close to the mating surface with the center case 120 and forms a narrow portion C1 with the barrier 128d. 4 and 5, the width-adjusting side wall 113a extends from the barrier 128d toward the through hole n by a predetermined value ΔL, and then moves away from the mating surface with the center case 120 and the partition wall 122 of the center case 120. Are integrally connected to a bulging side wall 113b forming a volume increasing region R2 having a volume larger than that of the oil inflow blocking region R1.

  According to such a configuration, when oil mixed with high-temperature and high-pressure gas or bubbled oil enters from the inlet 2 opened in the transmission case 100, the rear side of the inlet 2 in the side wall 120 of the center case 120. Most of the barrier 128d extending from the portion positioned toward the mating surface with the converter case 110 is blocked, and in order to enter the deeper volume increasing region R2, between the barrier 128d and the width-adjusting side wall 113a. It must pass through the narrow portion C1 indicated by the formed symbol t. For this reason, at least the oil mixed with the high-temperature and high-pressure gas can be blocked by the oil inflow blocking region R1.

  Most of the bubbling oil is destroyed by the surface tension at the narrow portion C1. In addition, according to such a configuration, the volume increasing region R2 is expanded as another region different from the oil inflow region R1 behind the barrier 128d that has passed through the narrowed portion C1, so that the bubbled oil is destroyed at the narrowed portion C1. Even if it is enlarged without cooling, it is liquefied again and returned to the transmission case 100 by being cooled and decompressed as the volume increases in the volume increasing region R2. In addition, although the width dimension of the narrow part C1 can be suitably set according to the component of oil, the use of a transmission, etc., as a specific example, it shall be about 3-5 mm, for example.

  According to such a configuration, the high-temperature and high-pressure gas filled in the transmission case 100 can be discharged to the outside through the through hole n formed in the transmission case 100, while the oil mixed with the high-temperature and high-pressure gas And the bulging out of the bubbled oil can be significantly suppressed.

  Moreover, since the width adjusting side wall 113a provided in the converter case 110 is brought close to the mating surface with the center case 120, an empty space S can be formed in a portion adjacent to the width adjusting side wall 113a by the approaching amount. Thus, the transmission case 100 can be slimmed. Accordingly, for example, other accessories are arranged in the empty space S, or as shown in FIGS. 4 and 5, the mounting hole 119 is provided, and the rotation of the transmission gear that rotates together with the secondary pulley 15 is provided in the mounting hole 119. If the rotation sensor 20 that detects the number and the rotation number of the secondary pulley 15 is fixed, the transmission unit as a whole can be reduced in size.

  Further, in the air breather chamber 1, the width-adjusting side wall 113a may end immediately at the barrier 128d, but in that case, if the oil enters from the narrowed portion C1, there is a possibility that it will go to the through hole n at a stretch. For this reason, as in this embodiment, if the width-adjusting side wall 113a extends from the barrier 128d toward the through hole n by a predetermined value ΔL, the oil entering from the narrowed portion C1 has surface tension with the width-adjusting side wall 113a. Therefore, it is not necessary to go to the through hole n at a stretch.

  Furthermore, in this embodiment, the side wall 113b that is connected to the width-adjusting side wall 113a and is adjacent to the through hole n is away from the mating surface with the center case 120, and a volume increasing region R2 is formed between the side wall 123 of the center case 120. Because it becomes a bulging side wall, the oil mixed with high-temperature and high-pressure gas approaching just before the through-hole n, or the bubbled oil is cooled and decompressed, and the jet of oil mixed with high-temperature and high-pressure gas, Swelling of bubbled oil can be suppressed to the maximum.

In addition, if an oil splashing prevention plate 128c is provided in the inlet 2 as in the air breather chamber 1, it is possible to further suppress the intrusion of the scraped oil. Further, in this case, the first gap A ₁ is formed between the oil splash preventing plate 128c and the peripheral wall 121 of the center case 120, and the base portion 128c ₁ of the splash preventing plate 128c is placed below the side wall 113a. Since the second gap A ₂ is formed between the width-adjusting side wall 113a and the inlet 2 is divided into two systems, the gas in the space R is separated from the first gap A ₁ and the second gap A ₁ . A return circuit that can flow into both the _second gap A ₂ and discharge to the outside through the through-hole n, and drop the oil that has entered by mistake into the second gap A ₂ and return it to the space R from the gap A _2. It can be formed integrally.

  The above description exemplifies a preferred embodiment of the present invention, but various modifications can be made by those skilled in the art within the scope of the claims. For example, in the embodiment described above, the transmission case 100 is formed by the three split cases 110 to 130, but can be applied to any transmission case as long as it is formed by at least two split cases. . For this reason, in this embodiment, the partition wall that divides the inside of the split case into two is used as the side wall according to the present invention. However, if only two split cases are considered, the split that forms the external shape of the transmission case is considered. The outer wall of the case may be used as the side wall according to the present invention.

  In this embodiment, the transmission case of the belt-type continuously variable transmission unit of the 4-axis arrangement has been described. However, it may be used as a housing for a transmission unit of a 3-axis arrangement in which the secondary pulley and the idler gear are coaxially arranged.

  Further, the transmission unit is not limited to the belt-type continuously variable transmission unit, and may be applied to a stepped automatic transmission unit or a stepped manual transmission unit. In this case, it is only necessary to form a space between the two split cases and fill the interior with oil. For example, when filling oil between the center case and the side case It can also be employed as a detour formed between the center case and the side case.

  The present invention can be applied as a case for a transmission unit that is employed in general vehicles such as passenger cars and special work vehicles.

1 is a schematic cross-sectional view illustrating a belt-type continuously variable transmission unit that employs an air breather structure of a transmission case according to the present invention. It is a front view which shows the converter case of FIG. 1 from a mating surface. It is a front view which shows the center case of FIG. 1 from a mating surface. It is the figure which showed the air breather structure according to this invention from the XX cross section of FIG. FIG. 5 is a perspective sectional view of FIG. 4. It is the principal part expanded sectional view which showed the state which match | combined the converter case and the center case from the YY cross section of FIG.

Explanation of symbols

1 Air breather room 2 Entrance
100 transmission case
110 Converter case
111 perimeter wall
112 Flange
112f flat surface
113 Bulkhead
113a Bulkhead (side wall)
113b Bulkhead (bulging side wall)
118 Information wall
118a vertical wall
118b curved wall
118c inclined wall
120 Center case
121 wall
122 Flange
122f flat surface
123 Bulkhead (side wall)
128a vertical wall
128b curved wall
128c Oil splashproof plate
128d barrier
130 Side case A ₁ First gap A ₂ Second gap

Claims (5)

A gearshift having an inlet opened in the transmission case in the vicinity of the mating surface of the two split cases forming the transmission case, and an air breather chamber for communicating the inlet with a through hole formed in the transmission case. Air breather structure of the machine case,
The air breather chamber is provided with a barrier extending from a portion of the side wall of one split case toward a mating surface with the other split case from a portion located behind the inlet, and an oil is provided between the barrier and the inlet. A region that prevents the inflow of the other split case, and a part of the side wall of the other split case is brought close to the mating surface with the one split case to form a width-adjusting side wall. An air breather structure for a transmission case, characterized in that a narrow portion is provided between which a region for preventing the inflow of oil is communicated with another region located behind the barrier.   2. The air breather structure of a transmission case according to claim 1, wherein the width-adjusting side wall extends from the barrier toward the through hole by a predetermined value.   The other split case is connected to the width-adjusting side wall, and the side wall adjacent to the through hole is away from the mating surface and forms a bulge that forms an area with an increased volume between the side wall of the one split case. The air breather structure for a transmission case according to claim 1 or 2, wherein the structure is an exit wall.   The air breather chamber is provided with an oil splash preventing plate near the entrance thereof, and a first gap is formed between the oil splash preventing plate and the one split case, and a base portion of the oil splash preventing plate is disposed at the width. 4. The system according to claim 1, wherein a second gap is formed between the side wall and the width side wall, and the inlet is divided into two systems. 5. The air breather structure of the transmission case as described in 1.   The air breather structure for a transmission case according to any one of claims 1 to 4, wherein a rotation sensor is arranged in an empty space generated by providing the width-adjusting side wall.

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