JP4765792B2 - transmission - Google Patents

Description

  The present invention relates to a transmission, and more particularly to adjustment of the oil level of the hydraulic oil.

  Conventionally, a sealed housing and a cylindrical member provided so as to protrude upward at the lower part of the housing are provided. When the oil level of the hydraulic oil in the housing exceeds a predetermined oil level, the hydraulic oil overflows. Transmissions that are drained through a tubular member and adjusted to a predetermined oil level are known.

  For example, in Patent Document 1, a solid drain plug attached to the opening of the oil pan chamber, a hollow intermediate plug attached to the tip of the drain plug in the axial direction, and an axial direction of the intermediate plug are attached. An oil pan chamber unit that is attached to an automatic transmission including a tube, a seat plug attached to the oil pan chamber, and an oil seal is disclosed. In this oil pan chamber unit, the liquid level of the hydraulic oil is maintained at the upper end of the tube without using a level gauge.

  On the other hand, for example, in Patent Document 2, a partition wall is formed in a housing between a transmission chamber that houses a belt-type continuously variable transmission and a power transmission mechanism chamber that houses a differential device connected to the continuously variable transmission so that power can be transmitted. And a vehicle transmission housing having an oil pan chamber for storing lubricating oil at a lower portion.

The housing includes a weir that divides a lower portion of the power transmission mechanism chamber into a bottomed differential chamber that houses the differential device and an oil pan chamber that communicates with the oil pan chamber, and a through hole is opened in the weir. This makes it possible to prevent the oil levels in the differential chamber and the oil pan chamber from matching each other, to reduce the amount of lubricating oil stored in the housing, and to improve lubricity and agitation resistance due to final gears, etc. We are trying to reduce it.
JP 2004-340244 A JP 2004-36633 A

  However, in a transmission such as Patent Document 2, the oil level in the differential chamber does not rise above the through hole, but when the amount of scraping by the differential gear is small, more lubricant is stored in the differential chamber than necessary. Therefore, there is a problem that an increase in stirring resistance is unavoidable.

  Further, as in Patent Document 2, since one side is filled with hydraulic equipment and the like, a certain level of oil is always required, but the other side is that the oil level is desired to be as low as possible in order to reduce the stirring resistance. In addition, in a transmission having a first reservoir and a second reservoir that may be separated from each other and may not have the same oil level, the amount of hydraulic oil stored in both reservoirs is accurately grasped and the oil level If the oil level is not adjusted, the oil pan chamber unit as in Patent Document 1 is applied to overflow the excess hydraulic oil. Even if the oil level should have been adjusted properly during adjustment, it will operate during operation. In some cases, too much oil will increase the stirring resistance. For this reason, the oil adjustment work is extremely difficult.

  The present invention has been made in view of the above points, and the object of the present invention is easy and reliable even in a transmission having first and second storage portions in which oil levels may not match each other. It is to be able to adjust the oil level.

  In order to achieve the above object, according to the present invention, a drain plug is provided that shuts off or communicates between the inside of the tubular member and the outside of the housing, and when the drain plug is attached, the first reservoir and the second reservoir The first reservoir and the second reservoir were communicated when the drain plug was removed.

Specifically, in the first invention, a sealed housing and a cylindrical member provided so as to protrude upward at the lower portion of the housing,
An object of the present invention is a transmission in which when the oil level of the hydraulic oil in the housing exceeds a predetermined oil level, the hydraulic oil overflows and is drained through the cylindrical member to be adjusted to the predetermined oil level.

And the transmission is
A first reservoir that is provided in the lower portion of the housing and stores hydraulic oil;
A second reservoir that is provided in the housing partitioned from the first reservoir and stores hydraulic oil;
A communication hole communicating the first storage part and the second storage part;
An on-off valve capable of freely opening and closing the communication hole;
A drain plug that disconnects or communicates the inside of the tubular member and the outside of the housing by attachment and detachment;
The on-off valve
An opening and closing member for opening and closing the communication hole;
One end is attached to the opening / closing member, and the other end is in contact with the upper end surface of the drain plug when the drain plug is attached. A biasing member for biasing,
When fitted with the drain plug, the closing member closes the communication hole, when removed the drain plug, the opening and closing member is configured to open the communication hole.

With the above structure, when attaching the drain plug, one end and the other end of the biasing member which is attached to the opening and closing member is brought into contact with the upper end surface of the drain plug to urge the closing member upwards off valve (opening and closing member ) Is closed and the first reservoir and the second reservoir are blocked. Then, since the 1st storage part and the 2nd storage part are divided, there is no movement of hydraulic fluid between both passing through a communicating hole. For this reason, it becomes possible to make a mutual oil level not correspond in a 1st storage part and a 2nd storage part. On the other hand, if the drain plug is removed during oil adjustment, the other end of the urging member is separated from the upper end surface of the drain plug, so that the force that urges the opening / closing member upward does not act, and the opening / closing valve (opening / closing member) opens. The first reservoir and the second reservoir communicate with each other. Then, one hydraulic oil in a 1st storage part and a 2nd storage part with a high oil level flows into the other with a low oil level through a communicating hole. Thus, the oil level in the first reservoir and the oil level in the second reservoir are equalized, or one of the oil levels in the first reservoir and the second reservoir is a predetermined level (may be 0). ). In this state, when the oil level of the other reservoir exceeds a predetermined oil level, the hydraulic oil overflows and is discharged through the cylindrical member. The oil level of the hydraulic oil is adjusted to a predetermined level.

In the second invention, a speed change mechanism provided in the housing and a differential mechanism connected to an output portion of the speed change mechanism;
An oil pan chamber that is provided in a lower portion of the housing below the speed change mechanism and stores hydraulic oil;
The first reservoir is the oil pan chamber;
The second storage unit is a differential chamber including the differential mechanism.

  According to the above configuration, when the drain plug is attached, the on-off valve is closed and the oil pan chamber and the differential chamber are shut off. Then, since the oil pan chamber and the differential chamber are partitioned, there is no movement of hydraulic oil between the two through the communication hole. When the transmission operates at this time, the hydraulic oil in the differential chamber is scraped up by the differential mechanism and flows into the oil pan chamber, so that the hydraulic oil in the differential chamber is kept to a minimum. For this reason, the stirring resistance of the differential mechanism is reduced. On the other hand, if the drain plug is removed during oil adjustment, the on-off valve opens and the oil pan chamber and the differential chamber communicate with each other. Then, the hydraulic oil in the oil pan chamber with a high oil level flows into the differential chamber with a low oil level through the communication hole. As a result, the oil level in the oil pan chamber and the oil level in the differential chamber are equalized, or the oil level in the oil pan chamber is kept at a predetermined level. In this state, if the oil level in the reservoir of the differential chamber exceeds a predetermined oil level, the hydraulic oil overflows and is discharged through the cylindrical member. The oil level of the hydraulic oil is adjusted to a predetermined level.

In a third invention, a transmission mechanism provided inside the housing and a differential mechanism connected to an output portion of the transmission mechanism;
An oil pan chamber that is provided in a lower portion of the housing below the speed change mechanism and stores hydraulic oil;
The first reservoir is a differential chamber including the oil pan chamber and the differential mechanism,
The second storage section is a hydraulic equipment chamber that is provided above the first storage section and for immersing the hydraulic equipment provided inside the stored hydraulic fluid.

  According to the above configuration, when a transmission with a drain plug attached is operated, the hydraulic equipment is immersed in the hydraulic equipment chamber, preventing air from entering the hydraulic equipment and reducing noise generated from the hydraulic equipment. It is possible to cool the hydraulic equipment. On the other hand, when the drain plug is removed during oil adjustment, the on-off valve is opened, and the hydraulic oil in the hydraulic equipment chamber having a high oil level flows into the oil pan chamber or the differential chamber having a low oil level through the communication hole. For example, by flowing all the oil in the hydraulic equipment chamber into the oil pan chamber or the differential chamber, excess hydraulic oil in the housing is discharged out of the housing through the cylindrical member and adjusted to a predetermined level. For this reason, the oil level in the entire housing can be adjusted.

  In the fourth invention, the cylindrical member is provided in the differential chamber.

According to the above configuration, since the hydraulic oil in the differential chamber is low during operation, even if the drain plug is removed during oil adjustment, the hydraulic oil does not overflow immediately more than necessary, and excess hydraulic oil in the differential chamber. Since only the gas is discharged through the cylindrical member, the amount of drain during adjustment can be reduced .

In a fifth aspect, the opening / closing member includes a cylindrical portion formed so as to be capable of reciprocating in the axial direction on the outer periphery of the cylindrical member.

  According to said structure, since the opening / closing member is provided with the cylindrical part, if this cylindrical part tries to incline, it will prevent that the opening / closing member inclines because the inner surface contacts the outer periphery of a cylindrical member.

As described above, according to the first aspect of the present invention, the drain plug that shuts off or communicates between the inside of the tubular member and the outside of the housing is provided, and when the drain plug is attached, one end is attached to the opening / closing member. The other end of the urging member abuts the upper end surface of the drain plug to urge the opening / closing member upward, and the opening / closing valve (opening / closing member) has a communication hole communicating the first storage portion and the second storage portion. When the drain plug is removed, the other end of the urging member is separated from the upper end surface of the drain plug so that the force for urging the opening / closing member does not act and the opening / closing valve (opening / closing member) opens. The first storage unit and the second storage unit communicate with each other. For this reason, by linking the drain plug and the on-off valve, the amount of hydraulic oil in the housing is grasped and the excess amount is discharged, so that the oil level can be adjusted very easily. Therefore, even in a transmission having a first reservoir and a second reservoir that may not match each other, the oil level of the hydraulic oil in the entire housing can be easily and accurately adjusted to a predetermined level. Can do.

  According to the second aspect of the invention, the first reservoir is the oil pan chamber, the second reservoir is the differential chamber, and the hydraulic oil in the second reservoir during operation of the transmission with the drain plug attached is kept to a minimum. The stirring resistance is reduced, and at the time of oil adjustment with the drain plug removed, the first reservoir and the second reservoir are communicated so that the oil level of the hydraulic oil in the entire housing can be adjusted without excess or deficiency. . For this reason, a transmission with good fuel consumption and easy oil adjustment can be obtained.

  According to the third aspect of the present invention, the first reservoir is an oil pan chamber and a differential chamber, and the second reservoir is a hydraulic device chamber above the first reservoir. It is possible to prevent air from entering the inside, reduce noise generated from hydraulic equipment, cool down hydraulic equipment, etc., and at the time of oil adjustment, hydraulic oil in the hydraulic equipment room can be transferred to the oil pan chamber or differential chamber from the communication hole. By pouring, the oil level in the entire housing can be adjusted easily and reliably.

According to the fourth aspect of the present invention, since the cylindrical member is provided in the differential chamber where the oil level becomes low during operation, and the drain amount during adjustment is reduced, the workability of oil adjustment can be further improved .

According to the above SL fifth invention, by providing a cylindrical portion on the closing member, by which to prevent the closing member is inclined, it is possible to reliably block the communication hole, it is smoothly opening and closing member slides Therefore, oil adjustment can be performed easily and reliably.

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

(Embodiment 1)
FIG. 1 is a side sectional view schematically showing a transmission 1 according to a first embodiment of the present invention. The transmission 1 includes a sealed housing 2. The left side of FIG. 1 shows the vehicle front side of the automatic vehicle, and the right side shows the vehicle rear side. An oil pan chamber 3 is formed in the front lower portion of the housing 2 as a first reservoir for storing hydraulic oil. On the rear side, a differential chamber 5 is formed as a second storage section partitioned from the oil pan chamber 3 by a weir member 4. The weir member 4 stands substantially vertically from the lower portion of the housing 2 and plays a role of restricting the flow of hydraulic oil between the oil pan chamber 3 and the differential chamber 5. The upper end of the weir member 4 is slightly inclined rearward. The oil pan chamber 3 is formed in a region surrounded by a front lower portion of the housing 2 and a sheet metal oil pan 15 provided continuously to the front lower portion of the housing 2.

  A transmission mechanism 6 and a differential mechanism 10 are accommodated in the housing 2. Specifically, a transmission mechanism 6 is disposed above the oil pan chamber 3 on the front side of the housing 2, and the transmission mechanism 6 includes a primary shaft 7 driven by an engine (not shown) and a secondary shaft 8 behind the primary shaft 7. It has. In the differential chamber 5 on the rear side, a differential shaft 11 of a differential mechanism 10 driven by a final drive gear 9 as an output portion of the transmission mechanism 6 is disposed. That is, the counter drive gear 12 of the primary shaft 7 drives the counter driven gear 13 to rotate the secondary shaft 8, and the secondary shaft 8 rotates to drive the final drive gear 9, and the final drive gear 9 As a result, the ring gear 14 of the differential shaft 11 is driven. The transmission mechanism 6 and the differential mechanism 10 are forcibly supplied with hydraulic oil through a hydraulic oil supply path from an oil pump (not shown). As described above, the hydraulic oil in the housing 2 is used for lubrication of the speed change mechanism 6, the differential mechanism 10, and the like, and hydraulic equipment such as an oil pump and a valve body disposed in the oil pan chamber 3. .

  As shown in an enlarged view in FIG. 2, an overlapping region 16 that overlaps in plan view is formed at the rear end of the oil pan chamber 3 on the front side of the weir member 4 and the front end of the differential chamber 5. A communication hole 17 that connects the oil pan chamber 3 and the differential chamber 5 is formed in the lower surface 3 a of the oil pan chamber 3 in the overlapping region 16. The shape of the communication hole 17 may be circular or square.

  A drain opening 18 is formed in the vicinity of the communication hole 17 on the differential chamber lower surface 5a, and a cylindrical member 20 is fitted into the drain opening 18 so as to protrude vertically upward. The tubular member 20 is formed of a round pipe, and a lower end portion of the tubular member 20 is formed with a plug attaching screw portion 21a at the center, and the tubular member attaching portion 21 having a flange portion 21b is fixed. The tubular member 20 is attached to the lower portion of the housing 2 by fitting the annular seal member 22 on the upper surface of the flange portion 21b of the tubular member attaching portion 21 and screwing it into the drain opening 18. The inside of the chamber 5 communicates with the outside of the housing 2. A plurality of oil level adjusting slits 24 are formed at the upper end of the cylindrical member 20 in accordance with the oil level L3 at the time of oil adjustment.

  A drain plug 23 is screwed into the plug mounting screw portion 21 a of the cylindrical member 20. The drain plug 23 has a flange portion 23a and a hexagonal hole 23b, and the male screw portion 23c is fitted into the plug mounting screw portion 21a. Oil leakage is provided by fitting the annular seal member 22 on the upper surface of the flange portion 23a of the drain plug 23. The drain plug 23 is configured to block or communicate between the inside of the tubular member 20 and the outside of the housing 2 by attachment and detachment.

  The communication hole 17 is provided with an on-off valve 30 that can open and close the communication hole 17. The on-off valve 30 includes a flat on-off member 31 that opens and closes the communication hole 17 and a cylindrical portion 32 that is connected perpendicularly to the on-off member 31 and has an open lower end. An upper end of a spring spring 33 as an urging member is fixed to the upper wall lower surface 32a of the cylindrical portion 32. Although not shown, a plurality of slits for oil passage are formed in the cylindrical portion 32 so that hydraulic oil outside the cylindrical portion 32 can easily enter the cylindrical portion 32. When the spring spring 33 is inserted into the cylindrical member 20 from the lower end side, the cylindrical member 20 is disposed between the cylindrical portion 32 and the spring spring 33, and the cylindrical portion 32 extends around the outer periphery of the cylindrical member 20. It can be reciprocated in the axial direction.

  With this configuration, in a state in which the drain plug 23 is attached, the lower end of the spring spring 33 abuts on the upper end surface of the drain plug 23 and urges the opening / closing member 31 upward. Thus, the on-off valve 30 is closed when the drain plug 23 is attached, and the on-off valve 30 is opened when the drain plug 23 is removed.

  As shown in FIG. 1, an oil injection hole 35 for injecting hydraulic oil is formed in the upper front portion of the housing 2. A cap 36 is attached to the oil injection hole 35.

-Action-
Next, the operation of the transmission 1 according to the present embodiment will be described.

  First, the stop and operation of the transmission 1 will be described.

  A drain plug 23 is attached when the transmission 1 in FIG. 1 is stopped and when the transmission 1 in FIG. 3 is in operation. In this state, as shown in FIG. 2, the lower end of the spring spring 33 whose upper end is attached to the opening / closing member 31 is in contact with the upper end surface of the drain plug 23 to urge the opening / closing member 31 upward. Therefore, the cylindrical portion 32 is pushed upward along the outer periphery of the cylindrical member 20, and the opening / closing member 31 reliably closes the communication hole 17. As a result, the gap between the oil pan chamber 3 and the differential chamber 5 is blocked, and there is no movement of hydraulic oil between the two through the communication hole 17.

  As shown in FIG. 3, when the transmission 1 is operated, hydraulic oil is forcibly supplied from the oil pump to the transmission mechanism 6 and the differential mechanism 10. Further, the counter driven gear 13 is driven by the counter drive gear 12 of the primary shaft 7 to rotate the secondary shaft 8. The final drive gear 9 is driven by the rotation of the secondary shaft 8. The ring gear 14 of the differential shaft 11 is driven by the final drive gear 9. When the vehicle moves forward, the ring gear 14 rotates counterclockwise. As a result, the hydraulic oil in the differential chamber 5 is scraped up by the ring gear 14 and flows into the oil pan chamber 3 as indicated by a thick arrow. For this reason, the hydraulic oil in the differential chamber 5 is always scraped up by the ring gear 14 during operation, so that the oil level L1 is kept to a minimum and the oil level L2 of the oil pan chamber 3 is increased. Therefore, the stirring resistance of the differential mechanism 10 is reduced and the fuel efficiency is improved. Although the oil level L1 is described as being higher in the drawing, practically no hydraulic oil is present on the lower surface of the differential chamber 5.

  Next, oil adjustment will be described.

  As shown in FIG. 4, when the drain plug 23 is removed during oil adjustment, the lower end of the spring spring 33 is separated from the upper end surface of the drain plug 23, so that the force that biases the opening / closing member 31 upward does not act. 31 is pushed by the hydraulic oil in the oil pan chamber 3, and the cylindrical portion 32 descends along the tubular member 20, and a gap is formed between the opening / closing member 31 and the communication hole 17. As a result, the on-off valve 30 is opened, the communication hole 17 is communicated, and the oil pan chamber 3 and the differential chamber 5 are communicated. Then, the hydraulic oil in the oil pan chamber 3 having a high oil level L2 flows into the differential chamber 5 having a low oil level L1 through the communication hole 17. Thus, the oil level L2 in the oil pan chamber 3 and the oil level L1 in the differential chamber 5 are made uniform. In this state, when the oil level L1 of the storage portion of the differential chamber 5 exceeds the predetermined oil level L3, the hydraulic oil overflows and is discharged through the cylindrical member 20. That is, the hydraulic oil that has passed through the communication hole 17 passes through the oil passage slit of the cylindrical portion 32, and then enters the cylindrical member 20 through the oil level adjusting slit 24 of the cylindrical member 20. And it overflows out of the housing 2 from the screw part 21a for plug attachment. In this case, even if the oil level gauge is not used, the oil levels L1, L2 of the hydraulic oil in the entire housing 2 are adjusted to the predetermined levels L3, L4 simply by removing the drain plug 23.

  At this time, since the opening / closing member 31 includes the cylindrical portion 32, when the cylindrical portion 32 is inclined, the opening / closing member 31 is prevented from being inclined by the inner surface of the opening / closing member 31 contacting the outer periphery of the cylindrical member 20. The For this reason, the communication hole 17 can be reliably blocked, and the opening / closing member 31 smoothly slides, so that oil adjustment can be performed easily and reliably.

  On the other hand, when the hydraulic oil does not flow even when the drain plug 23 is removed, the hydraulic oil in the housing 2 is insufficient, so the hydraulic oil is replenished from the oil injection hole 35 until the hydraulic oil comes out from the drain plug 23. .

  Thus, at the time of oil adjustment with the drain plug 23 removed, only the excess hydraulic oil passes through the tubular member 20 in the differential chamber 5 with a predetermined amount of hydraulic oil kept in the oil pan chamber 3. Since it is discharged, the drainage amount of hydraulic oil during adjustment is reduced, and workability is good.

  FIG. 5 shows a state when the oil is changed. When all the hydraulic fluid in the housing 2 is discharged, the drain plug 23 and the cylindrical member mounting portion 21 may be removed. Thus, the hydraulic oil in the oil pan chamber 3 flows into the differential chamber 5 side, and the hydraulic oil on the differential chamber 5 side is discharged out of the housing 2 through the drain opening 18.

  Therefore, according to the transmission 1 according to the present embodiment, the drain plug 23 and the on-off valve 30 are interlocked to grasp the amount of hydraulic oil in the housing 2 and discharge an excessive amount. Adjustment work can be performed very easily. Therefore, even in the transmission 1 including the oil pan chamber 3 and the differential chamber 5 in which the oil levels may not coincide with each other, the oil level of the entire working oil in the housing 2 is easily and accurately adjusted to a predetermined level. be able to.

(Embodiment 2)
6 to 8 show a second embodiment of the present invention, which differs from the first embodiment mainly in that the configurations of the first reservoir and the second reservoir are different. In FIG. 6, the side sectional view which simplified the transmission 101 concerning Embodiment 2 of this invention at the time of operation | movement is shown. FIG. 7 is an enlarged side sectional view showing the rear side of the transmission. FIG. 8 shows the oil adjustment. In the present embodiment, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  That is, in the transmission 101 of the present embodiment, the dam member 104 is formed in the middle part in the front-rear direction of the housing 102. The front side partitioned by the weir member 104 is an oil pan chamber 103, and the rear side is a differential chamber 105. The oil pan chamber 103 and the differential chamber 105 constitute a first reservoir.

  An oil insertion hole 104 a is formed on the lower end side of the weir member 104. The oil insertion hole 104a allows the oil pan chamber 103 and the differential chamber 105 to communicate with each other.

  Above the differential mechanism 10, a hydraulic equipment chamber 140 is formed as a second storage section. The lower end side of the valve body 141 is inserted into the hydraulic device chamber 140. Under the valve body 141, a duty solenoid 142 as a hydraulic device is provided. For example, the valve body 141 is added for control when a 4-speed automatic match transmission is upgraded to a 5-speed automatic transmission. The duty solenoid 142 is immersed in the hydraulic oil stored in the hydraulic equipment chamber 140.

  As shown in FIG. 7, a drain opening 18 is formed in the lower surface of the housing 2 on the rear side of the differential chamber 105. On the other hand, a communication hole 17 is formed in the lower surface of the hydraulic device chamber 140. An open / close valve 130 is provided in the communication hole 17. The on-off valve 130 includes a disk-like opening / closing member 131 that closes the communication hole 17, and a round bar-like valve body 132 that extends vertically from the opening / closing member 131. A retaining pin 134 is inserted into the upper end of the valve main body 132 so that the on-off valve 130 does not come out of the drain opening 18.

  A flange 137 is formed at the lower end of the valve body 132. The upper end of the spring spring 33 is fixed to the lower surface of the flange portion 137.

-Action-
Next, the operation of the transmission 101 according to the present embodiment will be described.

  First, the stop and operation of the transmission 101 will be described.

  When the transmission 101 is stopped and operated, a drain plug 23 is attached. In this state, as shown in FIG. 7, the lower end of the spring spring 33 comes into contact with the upper end surface of the drain plug 23 to urge the open / close member 131 upward, and the open / close valve 130 is closed to reliably shut off the communication hole 17. To do. As a result, the space between the hydraulic device chamber 140 and the differential chamber 105 is blocked, and there is no movement of hydraulic fluid between the two through the communication hole 17.

  As shown in FIG. 6, when the transmission 101 is operated, hydraulic oil is forcibly supplied from the oil pump to the transmission mechanism 6 and the differential mechanism 10. In addition, the speed change mechanism 6 and the differential mechanism 10 operate as in the first embodiment. When the vehicle moves forward, the counter driven gear 13 rotates clockwise and the ring gear 14 rotates counterclockwise. As a result, the hydraulic oil in the differential chamber 105 is scraped up by the ring gear 14 and flows into the oil pan chamber 103. For this reason, the hydraulic oil in the differential chamber 105 is always scraped up by the ring gear 14 during operation, so that the oil level L1 is kept to a minimum and the oil level L2 of the oil pan chamber 103 becomes high. Therefore, the stirring resistance of the differential mechanism 10 is reduced and the fuel efficiency is improved.

  Further, the hydraulic oil that has been scraped up by the counter driven gear 13 is poured into the hydraulic equipment chamber 140. Thus, the hydraulic equipment chamber 140 is filled with hydraulic oil as it overflows to the differential chamber 105 side. For this reason, since the duty solenoid 142 is immersed in the hydraulic oil, it is possible to prevent air from entering the duty solenoid 142, reduce noise generated from the duty solenoid 142, cool the duty solenoid 142, and the like.

  Next, oil adjustment will be described.

  As shown in FIG. 8, if the drain plug 23 is removed during oil adjustment, the lower end of the spring spring 33 is separated from the upper end surface of the drain plug 23, so that the force for urging the opening / closing member 131 upward does not act. 132 is lowered by its own weight or the like, and a gap is formed between the opening / closing member 131 and the communication hole 17, and the opening / closing valve 130 is opened to connect the communication hole 17. As a result, the differential chamber 105 and the hydraulic device chamber 140 communicate with each other. Then, the hydraulic oil in the upper hydraulic device chamber 140 is discharged to the differential chamber 105 through the communication hole 17, and all the hydraulic oil in the hydraulic device chamber 140 flows into the differential chamber 105.

  Next, the ring gear 14 is not scraped up or supplied by the oil pump, and the hydraulic oil in the housing 102 descends downward, and the oil level L2 in the oil pan chamber 103 and the differential chamber are lowered by the action of the oil insertion hole 104a. The oil level L1 in 105 is made uniform. In this state, when the oil level L1 of the differential chamber 105 exceeds the predetermined oil level L3, the hydraulic oil overflows and is discharged through the cylindrical member 20. In other words, the hydraulic oil passes through the oil level adjusting slit 24 of the cylindrical member 20 and enters the cylindrical member 20. And it overflows out of the housing 2 from the screw part 21a for plug attachment. In this case, even if the oil level gauge is not used, the oil levels L1, L2 of the hydraulic oil in the entire housing 2 are adjusted to the predetermined levels L3, L4 simply by removing the drain plug 23.

  On the other hand, when the hydraulic oil does not flow even when the drain plug 23 is removed, the hydraulic oil in the housing 2 is insufficient, so that the hydraulic oil is replenished from an oil injection hole (not shown) until the hydraulic oil comes out from the drain plug 23. To do.

  As described above, at the time of oil adjustment with the drain plug 23 removed, the hydraulic oil in the hydraulic device chamber 140 is once discharged into the differential chamber 105 and then only the excess hydraulic oil in the differential chamber 105 is the cylindrical member 20. Since the oil is discharged through the hydraulic fluid, the amount of drainage of hydraulic oil during adjustment is small and workability is good.

  Therefore, according to the transmission 101 of the present embodiment, when the transmission 101 is operated, the hydraulic equipment chamber 104 is filled with hydraulic oil to prevent air from entering the duty solenoid 142 and the noise generated from the duty solenoid 142 is reduced. The oil pressure can be reduced, the duty solenoid 142 can be cooled, and the hydraulic oil in the hydraulic device chamber 140 can be discharged from the communication hole 17 to the differential chamber 105 to adjust the oil level L2 in the oil pan chamber 103 and the differential pressure. Since the oil level L1 in the chamber 105 can be made uniform, the oil level in the entire housing 2 can be adjusted easily and reliably.

-Modification of Embodiment 2-
The present invention may be configured as follows for the second embodiment.

  As in the first embodiment, a cylindrical portion is provided on the lower end side of the valve main body 132, the cylindrical member 20 is disposed between the cylindrical portion and the spring spring 33, and the cylindrical portion extends in the axial direction on the outer periphery of the cylindrical member 20. It may be reciprocally movable.

  In the second embodiment, the hydraulic device is the duty solenoid 142 of the valve body 141, but may be a hydraulic motor of a hybrid vehicle.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above-described embodiment, an example of a transmission for an automatic vehicle has been described.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a simplified transmission according to Embodiment 1 of the present invention. It is a sectional side view which expands and shows a drain plug and its periphery. FIG. 2 is a view corresponding to FIG. 1 illustrating the transmission during operation. FIG. 2 is a view corresponding to FIG. 1 showing a transmission during oil adjustment. FIG. 2 is a view corresponding to FIG. 1 showing a transmission at the time of oil replacement. It is side sectional drawing which simplifies and shows the transmission concerning Embodiment 2 of this invention at the time of an action | operation. It is a side sectional view which expands and shows the rear side of a transmission. FIG. 7 is a diagram corresponding to FIG. 6 illustrating an outline of the transmission during oil adjustment.

DESCRIPTION OF SYMBOLS 1 Transmission 2 Housing 3 Oil pan chamber (1st storage part)
5 Differential chamber (second reservoir)
6 Transmission mechanism 10 Differential mechanism 17 Communication hole 18 Drain opening 20 Cylindrical member 23 Drain plug 30 Open / close valve 31 Open / close member 32 Cylindrical portion 33 Spring spring (biasing member)
101 Transmission 102 Housing 103 Oil pan chamber (first reservoir)
105 Differential chamber (first reservoir)
130 Opening / closing valve 131 Opening / closing member 140 Hydraulic equipment chamber (second reservoir)
142 Duty solenoid (hydraulic equipment)

Claims (5)

A hermetically sealed housing and a cylindrical member provided so as to protrude upward at the lower part of the housing;
A transmission in which when the oil level of the hydraulic oil in the housing exceeds a predetermined oil level, the hydraulic oil overflows and is drained through the cylindrical member to be adjusted to the predetermined oil level,
A first reservoir that is provided in the lower portion of the housing and stores hydraulic oil;
A second reservoir that is provided in the housing partitioned from the first reservoir and stores hydraulic oil;
A communication hole communicating the first storage part and the second storage part;
An on-off valve capable of freely opening and closing the communication hole;
A drain plug that disconnects or communicates the inside of the tubular member and the outside of the housing by attachment and detachment;
The on-off valve
An opening and closing member for opening and closing the communication hole;
One end is attached to the opening / closing member, and the other end is in contact with the upper end surface of the drain plug when the drain plug is attached. A biasing member for biasing,
The transmission is configured such that when the drain plug is attached, the opening and closing member closes the communication hole, and when the drain plug is removed, the opening and closing member opens the communication hole . The transmission according to claim 1, wherein
A speed change mechanism provided inside the housing and a differential mechanism connected to an output portion of the speed change mechanism;
An oil pan chamber that is provided in a lower portion of the housing below the speed change mechanism and stores hydraulic oil;
The first reservoir is the oil pan chamber;
The transmission, wherein the second storage part is a differential chamber including the differential mechanism. The transmission according to claim 1, wherein
A speed change mechanism provided inside the housing and a differential mechanism connected to an output portion of the speed change mechanism;
An oil pan chamber that is provided in a lower portion of the housing below the speed change mechanism and stores hydraulic oil;
The first reservoir is a differential chamber including the oil pan chamber and the differential mechanism,
The transmission according to claim 1, wherein the second storage part is a hydraulic equipment chamber that is provided above the first storage part and immerses the hydraulic equipment provided therein in the stored hydraulic fluid. The transmission according to claim 2 or 3,
The transmission is characterized in that the cylindrical member is provided in the differential chamber. The transmission according to any one of claims 1 to 4 ,
The transmission is characterized in that the opening / closing member includes a cylindrical portion formed so as to be reciprocally movable in the axial direction on the outer periphery of the cylindrical member.

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