JPH07280181A - Breather device - Google Patents

Abstract

PURPOSE:To improve the assembling property of a transmission by omitting the fabricating process of a catch tank itself, and efficiently collect the oil. CONSTITUTION:A case of a transmission is divided into a rear case 1L and a front case 1R, and parts 21 a, 21b of a catch tank are formed by opening the divided surface 101 of the rear case 1L and the divided surface of the front case 1R respectively. The front case 1L and the rear case 1R are tightened by bolts, and the divided surface 101 is attached thereto to form one sealed catch tank, and the fabricating process of the catch tank can be omitted, and the assembling property of the transmission can be greatly improved. The gas mixture is brought into contact with each member provided in a connection chamber 16, and this contact allows the atomized oil particles in the gas mixture to be bound with each other, or cooled down to be condensated and separated from the gas, and the oil can be efficiently collected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved breather device for a vehicle transmission.

[0002]

The breather device itself is a well-known technique. For example, the breather device used in the bearing device of the vertical rotating machine disclosed in Japanese Utility Model Laid-Open No. Sho 60-121528 prevents the pressure increase in the lubricating oil tank by connecting an air breather pipe to the lubricating oil tank. , An oil trap is used to separate gas and liquid to recover oil.
In the publication No. 13, a gas-liquid separation chamber is integrally attached to the side surface of the crankcase, a hole is provided in the crankcase, and a blow-by gas inlet is formed in this hole so that the gas-liquid separation chamber and the crank chamber communicate with each other. , The blow-by gas in the crankcase is guided to the gas-liquid separation chamber to separate the gas and the oil, the separated oil is collected in the oil pan, and the separated gas is released into the atmosphere. A separation device is disclosed.

As described above, in the breather device, the temperature inside the machine rises and the lubricating oil is heated and vaporized, so that the pressure inside the machine rises, and the rise in this pressure causes the oil to leak from the oil seal surface and the mating surface of the case. Used to prevent oozing. The technical content is that the inside of the machine is released to the atmosphere to prevent pressurization inside the machine to prevent the oil from seeping out, and the gas-liquid separator (catch tank) is used to remove the vaporized oil. The oil is recovered by condensing the oil to separate it from the gas and releasing the oil into the atmosphere, and the basic technique itself is a well-known technique which is already generally used. Therefore, the actual development sho 60
The technology disclosed in Japanese Patent No. 121528 is a technology for applying the basic publicly known technology of the breather device to a bearing device of a vertical rotating machine, and the technology disclosed in Japanese Utility Model Publication No. 64-46413 discloses blowby gas. Is disclosed as a technique for applying the basic publicly known technique of this breather device to the gas-liquid separation device.

Therefore, the breather device targeted by the present invention is used for a transmission, and a conventional example thereof will be described with reference to FIG. In the figure, the transmission case is a front case 1L and a rear case 1.
It is divided into R by a dividing surface 101, and a catch tank 2 is attached by bolts 3 to the surfaces of the front case 1L and the rear case 1R so as to straddle the dividing surface 101. The catch tank 2 is provided with breather nozzles 4 and 5, and the breather nozzle 5 is connected to a breather nozzle 8 provided in a shift lever case 9 by a breather hose 7. On the other hand, a hose 6 is connected to the breather nozzle 4 and is open to the atmosphere.

As shown in FIG. 11, the shift lever case 9
The base end 11 of the shift lever 10 is
The hemispherical base end 11 is pressed against the shift lever seat 14 to be supported, and the fulcrum bolt 14 allows the shift lever 10 to swing about the base end 11. Then, the base end portion of the shift lever boot 12 is locked to the shift lever case 9 so that the connection chamber 16 is sealed. Further, the tip end portion 19 of the shift lever 10 is engaged with one end of a gear shift shaft 17 supported by a bearing portion 18 provided on the rear case 1R. The front case 1L and the rear case 1R have flanges 33L and 33L.
R is provided, the bolts 32 are screwed into the bolt holes formed in the flanges 33L and 33R, and a sealing material such as a sheet packing is interposed on the dividing surface 101, so that the front case 1
L and rear case 1R are connected.

[0006]

The conventional example shown in FIG. 12 has the following problems to be improved. That is, since the catch tank is separated from the transmission case and is attached to the case with bolts, the number of parts to be assembled is large, especially for a mass-produced transmission, There is a problem that the number of assembling steps becomes large.

Further, in FIG. 12, the connecting chamber 16 and the gear chamber 20 are
Communicates with the gap between the gear shift shaft 17 and the bearing portion 18 shown in FIG. 11, so that when the resistance of this gap is large, the connection chamber 16 is connected to the atmosphere by the hose 6 connected to the catch tank 2. The pressure is reduced by opening to
The pressure in the gear chamber 20 cannot be lowered so much due to the resistance of the gap, and the transmission oil is heated by the temperature rise in the gear chamber 20 so that the pressure in the gear chamber 20 is increased. As a result, there is a problem that oil oozes out from a mating surface such as the dividing surface 101. Especially gear room
Since many gears are provided in the gear 20, and the transmission oil is vigorously stirred by these gears, the temperature rise and pressure increase in the gear chamber 20 become significant, and a considerable sealing effect is required to eliminate the oil bleeding. Since it is necessary to form a mating surface with a certain degree, it takes a lot of man-hours and cost to manufacture the transmission case, and there is a problem in terms of manufacturability of the transmission case.

Further, as shown in FIG. 11, the front case 1
The L and the rear case 1R are fastened with bolts 32 so that the dividing surface 101 is in close contact, and the catch tank 2 has the dividing surface.
Since it is attached to the front case 1L and the rear case 1R with the bolt 3 while straddling 101, the bolt 3
The position between the front case 1L and the rear case 1R is formed by the tightening force of the bolt 3 and the material and thickness of the seat packing, and the catch tank 2 is connected to the front case 1L while aligning the bolt 3. It takes a lot of time to mount it on the surface of the rear case 1R, and the hole at the bottom of the catch tank 2 through which the bolt 3 is inserted must be a sufficiently large hole, so that when mounting the catch tank 2 However, there is a problem in terms of assembling that the seal of the insertion portion of the bolt 3 must be perfect.

The present invention improves the assemblability of the transmission by omitting the process of assembling the catch tank itself, and
(EN) Provided is a breather device which efficiently lowers the pressure increase in a gear chamber to improve the manufacturability of a transmission case and efficiently collects oil.

[0010]

According to the present invention for solving the above-mentioned problems, a transmission case is divided into a rear case and a front case, and the rear case or the front case is divided into two parts. A catch tank is formed, and the catch tank is provided with an atmosphere opening nozzle and a breather hose connecting nozzle.

The transmission case is divided into a rear case and a front case, and the split surface of the rear case and the split surface of the front case are opened to form a part of the catch tank. The air release nozzle is provided on one side, and the breather hose connecting nozzle is provided on a part of the other catch tank.

According to the present invention, the transmission case is divided into a rear case and a front case, and the split surface of the rear case and the split surface of the front case are opened to form a part of the catch tank. One of the parts is provided with a nozzle for opening to the atmosphere, and the other part of the catch tank is provided with a nozzle for connecting a breather hose and a nozzle for connecting a return hose.

The present invention is characterized in that a communication hole for communicating the gear chamber and the connection chamber is provided, a breather nozzle is provided in the connection chamber, and the breather nozzle and the breather nozzle provided in the catch tank are connected by a breather hose. And

According to the present invention, a communication hole for communicating the gear chamber and the connection chamber is provided, a breather nozzle and a return nozzle are provided in the connection chamber, and the breather nozzle and the return nozzle and the breather nozzle and the return nozzle provided in the catch tank are provided. Are connected by a breather hose and a return hose, respectively.

The present invention is characterized in that the shift lever case is provided with a breather nozzle.

The present invention is characterized in that the shift lever case is provided with a breather nozzle and a return nozzle.

The present invention is characterized in that the boot of the shift lever is provided with a breather nozzle.

[0018]

Since the present invention is constructed as described above, it has the following effects. That is, the case of the transmission is divided into a rear case and a front case, and one of the divided surfaces and one of the divided surfaces of the rear case and the divided surface of the front case are opened to form a part of the catch tank. When die-casting the rear case, the undercut portion can be eliminated in the part where the catch tank is partially formed, and the die-casting die can be simplified and mass-produced. Then, the front case and the rear case are fastened with bolts and the split surfaces are brought into close contact with each other, so that the catch tanks are partially joined to each other,
One closed catch tank can be formed. As described above, the catch tank is formed by fastening the front case and the rear case with the bolts, so that the process of assembling the catch tank can be omitted. The arrangement of the hose can be simplified by providing the atmosphere opening nozzle in one of the catch tanks and the breather hose connecting nozzle in the other catch tank. Further, by providing a breather hose connecting nozzle and a return hose connecting nozzle in a part of the other catch tank, it becomes possible to separate the breather and the oil recovery path, and to reduce the nozzle diameter and downsize it. .

A communication hole for communicating the gear chamber and the connection chamber is provided, a breather nozzle is provided in the connection chamber, and the breather nozzle and the breather nozzle provided in the catch tank are connected by a breather hose. It is possible to reduce the pressure in the gear chamber by injecting a mixture of oil and air filled in the gear chamber at high temperature and high pressure into the connecting chamber via the. In addition, the air-fuel mixture in the gear chamber containing the oil vaporized at high temperature and high pressure, which has flowed into the connection chamber, comes into contact with each member provided in the connection chamber, and due to this contact, particles of vaporized oil in the air-fuel mixture are contacted. Can be combined with each other or cooled to be condensed and separated from the gas, and the air-fuel mixture can be introduced into the catch tank while lubricating the contacted parts. In this way, since the pressure in the gear chamber can be reliably reduced by the communication hole, it is possible to prevent oil bleeding from the split surface and other seal parts, and to reduce the manufacturing accuracy of the transmission case. It becomes possible to improve manufacturability.

Further, the air-fuel mixture that has flowed from the high pressure gear chamber through the communication hole into the low pressure connection chamber expands in the connection chamber, so that the pressure and the temperature also decrease.
Since the air-fuel mixture can be expanded in the connection chamber by passing through the communication hole in this way, the oil vaporized in the gas in the saturated state becomes supersaturated and can be separated from the gas. The separated oil can be returned to the gear chamber through the communication hole.

Further, a communication hole for communicating the gear chamber and the connection chamber is provided, a breather nozzle and a return nozzle are provided in the connection chamber, and the breather nozzle and the return nozzle and the breather nozzle and the return nozzle provided in the catch tank are provided. Since they are connected by the breather hose and the return hose, respectively, the hose can be downsized in addition to the function of providing the communication hole.

Further, by providing the breather nozzle in the shift lever case, it is possible to activate the disturbance of the air-fuel mixture to combine or condense the oil in the air-fuel mixture and to efficiently collect the oil in the air-fuel mixture. is there.

Further, by providing a breather nozzle in the boot of the shift lever, the disturbance of the air-fuel mixture is made more active to combine or condense the oil in the air-fuel mixture and collect the oil in the air-fuel mixture more efficiently. Is possible.

[0024]

EXAMPLE An example of the present invention will be described below. In FIG. 1, the transmission case is divided into two parts, a front case 1L and a rear case 1R, and a division surface 101 of the front case 1L and the rear case 1R is opened to form parts 21a and 21b of the catch tank. ing. A breather nozzle 22 is provided in a part 21b of the catch tank, and an atmosphere opening nozzle 23 is provided in a part 21a of the catch tank. The breather nozzle 22 is connected by a breather hose 7 to a breather nozzle 25 provided integrally with the shift lever case 9. Further, the connection chamber 16 and the gear chamber 20 which are hermetically sealed by the shift lever boot 12 are communicated with each other through a communication hole 24. Further, as shown by the phantom line, a wall surface 102 for closing the opening of the catch tank portion 21a is provided without providing the catch tank portion 21b, and a nozzle for connecting the breather hose 7 is provided on the wall surface 102. Good. On the contrary, do not install the part 21a of the catch tank and
The wall 102 that closes the opening of 21b is provided.
A nozzle for connecting the breather hose 7 to 02 may be provided.

Next, in the embodiment shown in FIG. 2, a breather nozzle 22 and a return nozzle 26 are provided in a part 21b of the catch tank, and a breather nozzle 25 and a return nozzle 28 are provided in the shift lever case 9 as well. Are connected by a breather hose 7 and a return hose 27. Since other parts are the same as those of the embodiment shown in FIG. 1, the same parts are designated by the same reference numerals and the description thereof will be omitted. 3 shows another embodiment in which a portion of the shift lever case 9 is shown in a partially enlarged manner. The difference from the embodiment shown in FIG. 1 is that instead of providing the breather nozzle 25 in the shift lever case 9, The lever boot 12 is provided with a breather nozzle 29. The other parts are not shown, but are the same as those shown in FIG.

4 to 10 are views showing the shift lever case 9 in FIG. 1, and the base end portion 11 of the shift lever 10 is shown.
A groove 29 into which the base end portion of the shift lever boot 12 is locked is provided in the upper portion of the support portion 36 that supports (see FIG. 11). Reference numeral 30 is a screw hole into which the fulcrum bolt 15 is screwed. As shown in FIGS. 4 and 9, a breather nozzle hole 31 is formed at a position deviated from the center of the screw hole 30, and the breather nozzle 25 is press-fitted into the breather nozzle hole 31. The breather nozzle hole 31 and the breather nozzle 25 can be integrally die-cast.

The breather nozzle hole 31 will be described in more detail. As shown in FIG. 6 and FIG.
A guide portion 34 having a space portion 35 is provided between the breather nozzle hole 31 and the outer surface of the breather nozzle hole 31 so as to communicate with the guide portion 34 at the top of the space portion 35. Further, in FIG. 7 showing the rear surface of the shift lever case 9, a space portion is shown.
35 is open. Further, as shown in FIGS. 4 and 9, a return nozzle 37 may be provided.

The operation of the present embodiment constructed as above will be described below. First, the transmission case is divided into two parts, a front case 1L and a rear case 1R. The split surface 101 of the front case 1L and the rear case 1R is opened, and a part of the catch tank 21a, 21.
Since b is formed, when die-casting the front case 1L and the rear case 1R, the undercut part can be eliminated in the part where the parts 21a and 21b of the catch tank are formed. Then, it becomes possible to mass-produce. This effect is the same when the wall surface 102 is provided.

Next, regarding the assembling property, the front case 1
The split surface 101 between L and the rear case 1R is opened to form parts 21a and 21b of the catch tank. Therefore, the front case 1L and the rear case 1R are fastened with bolts 32 (see FIG. 11), and the split surface is formed. By closely contacting 101, parts 21a and 21b of the catch tanks can be joined together to form a closed catch tank. In this way, the catch tank is formed by fastening the front case 1L and the rear case 1R with the bolts 32, so that the process of assembling the catch tank can be omitted. This effect is the same when the wall surface 102 is provided.

A breather nozzle 25 or 29 is provided in the connecting chamber 16 and a part of the catch tank 21 is provided by the breather hose 7.
Since it is connected to the breather nozzle 22 of one catch tank formed as described above at a and 21b, the air-fuel mixture containing oil vaporized at high temperature and high pressure is applied to the hemispherical base end portion 11, the shift lever seat 14, and the shift lever seat 14. Lever case 9, shift lever
Tip 19 of 10 and gearshift shaft 17 (see Figure 11)
The oil particles in the air-fuel mixture that are vaporized combine with each other by this contact, or are cooled and condensed and separated from the gas, and while the contacted parts are not lubricated, It becomes possible to lead to.

Further, the connecting chamber 16 and the gear chamber 20 are communicated with each other through a communicating hole 24, a breather nozzle 25 or 29 is provided in the connecting chamber 16, and a part of the catch tank 21a is provided by the breather hose 7.
, 21b connected to the breather nozzle 22 of one catch tank, the following effects are obtained. That is, since there are many gears in the gear chamber 20 and the transmission oil is agitated by these gears, the oil is heated to a high temperature and a high pressure particularly in the gear chamber 20. Therefore, by providing the communication hole 24, the mixture of oil and air that fills the gear chamber 20 at high temperature and high pressure flows into the coupling chamber 16 through the communication hole 24 and enters the gear chamber 20.
It is possible to reduce the internal pressure.

The connecting chamber 16 is connected to the connecting chamber 16 as described above.
The breather nozzle 25 or 29 provided in 16 is connected via the breather hose 7 to the breather nozzle 22 of one catch tank formed by the parts 21a and 21b of the catch tank. The air-fuel mixture in the gear chamber 20 containing oil vaporized at high temperature and high pressure has a hemispherical base end.
11, shift lever seat 14, shift lever case 9, tip portion 19 of shift lever 10 and gear shift shaft 17
(See FIG. 11), the particles of vaporized oil in the air-fuel mixture are bound to each other by this contact or are cooled and condensed and separated from the gas, and the contacted parts are not lubricated. Meanwhile, it becomes possible to lead the catch tank. In this way, since the pressure inside the gear chamber 20 can be reliably reduced by the communication hole 24, it is possible to prevent oil from bleeding from the split surface 101 and other sealing parts, and to improve the manufacturing accuracy of the transmission case. It becomes possible to improve the manufacturability by making it loose.

Further, the air-fuel mixture which has passed through the communication hole 24 from the gear chamber 20 having a high pressure and has flowed into the connection chamber 16 having a low pressure expands in the connection chamber 16, so that the pressure is lowered and the temperature is also increased. descend. By passing the communication hole 24 in this way, the connection chamber
Since the air-fuel mixture can be expanded inside the oil, the oil that was vaporized in the gas in the saturated state becomes supersaturated and can be separated from the gas, and the separated oil passes through the communication hole 24. It is possible to return the gear to the gear chamber 20. That is, in the connection chamber 16, the hemispherical base portion 11, the shift lever seat 14, the shift lever case 9, the tip portion 19 of the shift lever 10 and the gas-liquid separation by the contact with the gear shift shaft 17 and the gas by the expansion. The synergistic separation of liquid separation makes it possible to efficiently separate the oil component from the air-fuel mixture.

Next, when the breather nozzle 25 provided in the connecting chamber 16 is provided in the shift lever case 9, the following effects are obtained. That is, in FIG. 6 to FIG. 8, the air-fuel mixture that has flowed into the connection chamber 16 (see FIG. 1) flows in contact with the rear surface of the shift lever case 9 as shown by the arrows in FIGS. 7 and 8. Upon contact, the oil particles in the mixture are bound to each other or are cooled and condensed, and
When flowing out from the space portion 35 to the breather nozzle 25 as shown in Fig. 5, the air-fuel mixture comes into contact with the wall surface of the space portion 35 and the oil particles are bound to each other or are cooled and condensed, thus binding or condensing. The oil, which has become large particles, changes its direction to approximately 90 degrees while colliding with the top of the space 35 when flowing out to the breather nozzle 25, so the air-fuel mixture is disturbed and the inside of the air-fuel mixture is disturbed. It is possible to combine or condense oil and efficiently recover the oil in the air-fuel mixture.

Next, as shown in FIG. 3, when the breather nozzle 25 provided in the connecting chamber 16 is provided in the shift lever boot 12, the following effects are obtained. That is, the air-fuel mixture that has flowed into the connection chamber 16 from the gear shift shaft 17 or the communication hole 24 has the hemispherical base end portion 11, the shift lever seat 14, the shift lever case 9, and the tip portion of the shift lever 10.
Of course, the gas-liquid separation due to contact with the gear shift shaft 17 and the gear shift shaft 17 and the gas-liquid separation due to expansion are synergistically separated. It passes through the narrow gap between 111 as shown by the arrow (a), and further passes through the narrow gap between the slit 111 and the fulcrum bolt 15 as shown by the arrow (b), so the mixture passes through this narrow gap. As the mixture is disturbed and cooled, the oil in the mixture is allowed to combine and condense.

In this way, since the air-fuel mixture in which the oil in the air-fuel mixture is combined and condensed in the connection chamber 16 is guided to one catch tank formed by the parts 21a and 21b of the catch tank, the catch tank is caught. It becomes possible to significantly reduce the oil separation load in the tank, and the oil that could not be separated in the connecting chamber 16 is separated in the catch tank at the final stage to improve the oil recovery efficiency and to hose 6
Only air can be released from the air (see FIG. 1) into the atmosphere.

The oil collected in the catch tank returns through the breather hose 7 in the embodiment shown in FIG. 1, and returns through the return hose 27 in the embodiment shown in FIG. In this case, as shown in FIG. 1, since the breather hose 7 also serves as a breather and a return, one hose having a large diameter is used in order to reduce mutual flow resistance, thus simplifying the hose arrangement. Since the breather hose 7 and the return hose 27 are separately provided in the embodiment shown in FIG. 2,
There is no effect of mutual flow resistance, and there is an advantage that the hose diameter is reduced and the size is reduced.

[0038]

As described in detail above, according to the present invention, the transmission case is divided into a rear case and a front case,
Since the catch tank is formed on one of the split surfaces, or the split surface of the rear case and the split surface of the front case are opened to form a part of the catch tank, when the front case and the rear case are die-cast. In addition, the undercut portion can be eliminated in the part where the catch tank is partly formed, and the die-cast mold can be simplified and the production can be improved. Then, by fastening the front case and the rear case with bolts and bringing the divided surfaces into close contact, part of the catch tanks are joined together to form a closed catch tank. By fastening the rear case with the bolt with a bolt, a catch tank is formed, and the process of assembling the catch tank can be omitted.
Assembly of the transmission case can be greatly improved.

By providing a nozzle for releasing the atmosphere to one of the parts of the catch tank and a nozzle for connecting the breather hose to part of the other catch tank, the arrangement of the hose is simplified and the assembling property is improved. In addition, by providing a breather hose connecting nozzle and a return hose connecting nozzle in a part of the other catch tank, the breather and the oil recovery path are separated,
The diameter of the nozzle can be reduced to reduce the size.

A communication hole for communicating the gear chamber and the connecting chamber is provided, a breather nozzle is provided in the connecting chamber, and the breather nozzle and the breather nozzle provided in the catch tank are connected by a breather hose. The mixture of oil and air, which is filled with high temperature and high pressure in the gear chamber, can flow into the connecting chamber to reduce the pressure in the gear chamber. The mixture in the gear chamber containing the oil vaporized in 1 contacts each member provided in the coupling chamber, and the particles of vaporized oil in the mixture are bonded to each other or cooled by the contact. It is possible to guide the air-fuel mixture into the catch tank while condensing and separating it from each other and lubricating each of the above-mentioned contacted parts, which improves the oil recovery rate and makes it difficult to supply lubricating oil. The slip can be effectively utilized oil. In this way, since the pressure in the gear chamber can be reliably reduced by the communication hole, it is possible to prevent oil bleeding from the split surface and other seal parts, and to reduce the manufacturing accuracy of the transmission case. The manufacturability can be improved.

Further, the air-fuel mixture which has passed through the communication hole from the gear chamber having a high pressure and has flowed into the coupling chamber having a low pressure expands in the coupling chamber, so that the pressure is lowered and the temperature is also lowered to reach the saturated state. The oil that had been vaporized in the gas at the time of becoming oversaturated can be separated from the gas, and this separated oil can be returned to the gear chamber through the communication hole, improving the oil recovery rate. You can

Further, a communication hole for communicating the gear chamber and the connection chamber is provided, a breather nozzle and a return nozzle are provided in the connection chamber, and the breather nozzle and the return nozzle and the breather nozzle and the return nozzle provided in the catch tank are provided. Since they are connected by the breather hose and the return hose, respectively, the hose can be downsized in addition to the function and effect of providing the communication hole.

Further, by providing the breather nozzle in the shift lever case, it is possible to activate the disturbance of the air-fuel mixture to combine or condense the oil in the air-fuel mixture and to efficiently collect the oil in the air-fuel mixture.

Further, by providing a breather nozzle in the boot of the shift lever, the disturbance of the air-fuel mixture is made more active to combine or condense the oil in the air-fuel mixture and collect the oil in the air-fuel mixture more efficiently. You can

[0045]

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing the main parts of yet another embodiment of the present invention.

FIG. 4 is a front view of the shift lever case in FIG.

5 is a right side view of FIG. 4. FIG.

6 is a vertical sectional view taken along the line AA of FIG.

FIG. 7 is a bottom view of FIG.

8 is a vertical cross-sectional view taken along the line BB of FIG.

FIG. 9 is a plan view of FIG.

FIG. 10 is a rear view of FIG.

FIG. 11 is a longitudinal sectional view of a main part of a transmission case.

FIG. 12 is a vertical sectional view of a conventional example.

[Explanation of sign]

 1L front case 1R rear case 101 split surface 2 catch tank 4 breather nozzle 5 breather nozzle 6 hose 7 breather hose 8 breather nozzle 9 shift lever case 10 shift lever 11 base end 12 shift lever boot 16 connecting chamber 20 gear chamber 21a catch tank 21b Part of catch tank 22 Breather nozzle 23 Air release nozzle 24 Communication hole 25 Breather nozzle

Claims (8)

[Claims] 1. A transmission case is divided into a rear case and a front case, and a catch tank is formed on the divided surface of the rear case or the divided surface of the front case. The catch tank is provided with an atmosphere opening nozzle and a breather hose. A breather device having a connecting nozzle. 2. A case of a transmission is divided into a rear case and a front case, and a division surface of the rear case and a division surface of the front case are opened to form a part of a catch tank. A breather device, characterized in that an air opening nozzle is provided in one of the parts, and a breather hose connecting nozzle is provided in a part of the other catch tank. 3. A transmission case is divided into a rear case and a front case, and a division surface of the rear case and a division surface of the front case are opened to form a part of a catch tank. A breather device, characterized in that an air opening nozzle is provided in one of the parts, and a breather hose connecting nozzle and a return hose connecting nozzle are provided in a part of the other catch tank. 4. A communication hole for communicating between the gear chamber and the connection chamber is provided, a breather nozzle is provided in the connection chamber, and the breather nozzle and the breather nozzle provided in the catch tank are connected by a breather hose. The breather device according to claim 1. 5. A communication hole that connects the gear chamber and the connection chamber is provided, a breather nozzle and a return nozzle are provided in the connection chamber, and the breather nozzle and the return nozzle are provided with a breather nozzle and a return nozzle provided in the catch tank, respectively. The breather device according to claim 2, wherein the breather hose and the return hose are connected. 6. The breather device according to claim 3, wherein the shift lever case is provided with a breather nozzle. 7. The shift lever case is provided with a breather nozzle and a return nozzle.
The breather device described. 8. A breather device in which a boot of a shift lever is provided with a breather nozzle.