JP2010255640A - Vehicular transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular transmission device for maintaining the effect of reducing agitating resistance by suppressing the flowing movement of lubricating oil into a gear unit storage part of a reduction gear chamber even when the oil surface of the lubricating oil is significantly inclined to rise rearward. <P>SOLUTION: During the hill-climbing sudden start or sudden acceleration of a vehicle, a movable plate 32 as an oil movement suppressing means 31 is turned to the rear side of the vehicle with its dead weight and the inertial moving pressure of lubricating oil in an oil reservoir part 23 and its lower end is locked abutting onto the front edge of the upper terminal of a partition 21 to substantially amplify the height of the partition 21, thus preventing the flowing movement of the lubricating oil beyond the partition 21 from the oil reservoir 23 into the gear unit storage part 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle transmission, and more particularly to a lubricating structure for oil bath lubrication of a reduction gear in a reduction gear chamber separated in a transmission case.

  2. Description of the Related Art Conventionally, as a lubricating structure of a transmission for a vehicle, for example, as shown in Patent Document 1, a partition that partitions a bottom portion in a transmission case into a lubricating oil reservoir and a reduction device housing portion that houses a lower portion of the reduction device A structure having a portion is known.

Japanese Patent Laid-Open No. 10-252871

  The conventional lubricating structure is configured such that the lubricating oil reservoir portion and the reduction device housing portion are partitioned in the vehicle width direction by the partition portion at the bottom of the transmission case.

  For this reason, for example, when the vehicle oil level in the bottom of the transmission case is extremely backward and inclined, such as when the vehicle suddenly starts uphill, lubrication from the lubricating oil reservoir to the reduction device housing over the partition As the oil moves, the amount of lubricating oil that moves around the reduction device increases, and eventually, in the operation scene, the effect of reducing the stirring resistance due to the lubricating oil spinning cannot be obtained.

  Therefore, the present invention suppresses the inflow of lubricating oil into the gear unit housing portion of the reduction gear chamber even when the oil level of the lubricating oil is remarkably inclined upward in a driving scene such as when the vehicle is suddenly started uphill. An object of the present invention is to provide a vehicular transmission that can maintain the effect of reducing the stirring resistance caused by the rotation of lubricating oil.

  In the vehicle transmission of the present invention, the bottom part of the reduction gear chamber defined in the transmission case includes a gear unit housing part in which the reduction gear unit is disposed, and an oil reservoir part on the vehicle front side. When the oil level of the lubricating oil filled in the bottom of the reduction gear chamber is inclined rearward and upward, the gear unit is accommodated from the oil reservoir over the partition. And an oil movement restraining means for restraining the movement of the lubricating oil to the part.

  Lubricating oil in the bottom part of the reduction gear chamber is controlled through a communication port provided in communication with the lubricating oil supply control from the oil pan attached to the bottom part of the transmission case and the oil reservoir part and the oil pan. Due to the circulation action returned to the pan, a certain oil level is maintained, and the oil bath lubrication of the reduction gear unit is performed.

On the other hand, when the vehicle is in a normal posture, the upper end protrudes substantially the same as the lubricating oil surface at the bottom of the reduction gear chamber or slightly higher than the lubricating oil surface. For downhill running when the vehicle is in a downhill position, the amount of oil that the oil bath lubrication of the reduction gear unit can perform properly with low agitation resistance is reduced. With respect to the relative upward sloping of the lubricating oil surface during uphill traveling that can be sufficiently secured in the gear unit housing and the vehicle is inclined to rise forward, It is set to an arbitrary protruding height capable of blocking the movement of the lubricating oil toward the gear unit accommodating portion.

  In such setting of the partitioning part, when the slope of the lubricating oil at the bottom of the reduction gear chamber at the bottom of the reduction gear chamber suddenly increases due to inertial fluid motion when the vehicle suddenly starts up or accelerates suddenly, etc. In addition to the tendency that the lubricating oil in the oil reservoir part tends to move to the gear unit housing part side beyond the partition part, the stored lubricating oil in the oil pan is moved from the communication port by the liquid movement. By flowing backward, a large amount of lubricating oil tends to flow into the gear unit housing part.

  At this time, the movement of the lubricating oil from the oil reservoir part to the gear unit accommodating part is suppressed beyond the partition part by the oil movement suppressing means.

  According to the present invention, even when the vehicle suddenly starts uphill or suddenly accelerates, even if the slope of the upward rising slope of the lubricating oil surface at the bottom of the reduction gear chamber suddenly increases due to inertial fluid motion, the oil movement suppression means Since it is possible to suppress the movement of the lubricating oil from the oil reservoir part to the gear unit accommodating part beyond the partition part, the amount of lubricating oil in the gear unit accommodating part is appropriately maintained, and the agitation resistance is increased due to the stagnation of the lubricating oil. By avoiding this, the effect of reducing the stirring resistance by setting the partition portion can be maintained.

The side view which shows the reduction gear chamber in 1st Embodiment of the transmission for vehicles which concerns on this invention. The side view similar to FIG. 1 which shows the state at the time of vehicle backward tilting of lubricating oil. Explanatory drawing which shows typically the whole structure of a transmission case. The side view similar to FIG. 1 which shows the reduction | restoration gear chamber in 2nd Embodiment of this invention. The side view similar to FIG. 2 which shows the state at the time of vehicle backward tilting of lubricating oil.

  Hereinafter, a vehicle transmission apparatus including a CVT continuously variable transmission as an embodiment of the present invention will be described in detail.

  As shown in FIG. 3, the transmission case 1 is divided into a reduction gear chamber 4, a clutch pack chamber 5, and a transmission chamber 6 by partition walls 2 and 3.

  An oil pan 7 for storing lubricating oil is coupled to the bottom of the transmission case 1. A side opening portion of the reduction gear chamber 4 and a side opening portion of the transmission chamber 6 are a converter housing 8 and a side cover 9. Are fastened and fixed respectively.

  1 and 2 show the internal structure of the reduction gear chamber 4 with the converter housing 8 removed. The reduction gear unit 11 has a gear shaft 12 and a pair of parallel pulley shafts 14 of the CVT continuously variable transmission 13. , 15 is shown.

The engine output is transmitted from a torque converter (not shown) disposed in the converter housing 8 to the input shaft 12a of the reduction gear unit 11 disposed in the reduction gear chamber 4. The reduction gear unit 11 includes, for example, a small-diameter gear fixed to the input shaft 12a, a ring gear fixed to the output shaft 12b, and an intermediate gear meshing with the small-diameter gear and the ring gear. The transmitted driving force is decelerated at a predetermined reduction ratio and transmitted to a clutch mechanism (not shown) disposed in the clutch pack chamber 5 by the output shaft 12b.

  The CVT continuously variable transmission 13 includes a pair of pulleys 16 and 17 fixed to pulley shafts 14 and 15 in the transmission chamber 6, and a rotating belt 18 suspended from the pulleys 16 and 17. The driving force transmitted from the clutch mechanism is continuously variable continuously by the pulleys 16 and 17 and the rotating belt 18 and transmitted to a final drive unit (not shown).

  Here, the bottom part of the reduction gear chamber 4 of the transmission case 1 is connected to the front and rear sides of a gear unit housing part 22 in which the reduction gear unit 11 is disposed by a partition part 21 and an oil reservoir part 23 on the front side of the vehicle. It is partitioned in the direction.

  The peripheral surface of the gear unit accommodating portion 22 is formed as a circular arc surface concentric with the reduction gear unit 12, and the partition portion 21 extends upward from the bottom circular arc surface of the gear unit accommodating portion 22 to the oil reservoir 23 side. It is formed to project toward.

  The bottom portion of the reduction gear chamber 4 is filled with lubricating oil stored in the oil pan 7 by a control valve 24 disposed in the oil pan 7.

  The oil level L of the lubricating oil is set to a certain level, so that the oil bath lubrication of the reduction gear unit 11 is performed properly.

  The lubricating oil surface L is, for example, controlled by the control valve 24 to supply lubricating oil from the oil pan 7 and a communication port 25 provided in communication with the oil reservoir 23 and the oil pan 7 (see FIG. 3). Through the circulating action of the lubricating oil returned to the oil pan 7 through the above, the certain oil level is maintained.

  On the other hand, in the normal posture of the vehicle, the upper end of the partition portion 21 protrudes substantially the same as the lubricating oil surface L at the bottom of the reduction gear chamber 4 or slightly higher than the lubricating oil surface L. The oil bath lubrication of the reduction gear unit 11 has a low agitation resistance with respect to the relative forward rising inclination of the lubricating oil surface L during this normal state and when the vehicle is traveling on a downhill where the vehicle is in a downwardly inclined posture. A sufficient amount of oil that can be properly performed in the vehicle can be secured in the gear unit housing portion 22 and the lubricating oil surface L is inclined relatively upward when the vehicle is climbing up so that the vehicle tilts forward. On the other hand, it is set to an arbitrary protruding height that can block the movement of the lubricating oil in the oil reservoir 23 toward the gear unit accommodating portion 22 side.

  Further, in the vicinity of the bottom of the reduction gear chamber 4, when the oil level L of the lubricating oil is inclined rearward and upward, the oil reservoir 23 extends beyond the partition 21 in cooperation with the partition 21. An oil movement restraining means 31 for restraining the movement of the lubricating oil from the gear unit to the gear unit accommodating portion 22 is provided.

  In the present embodiment, a movable plate 32 that can rotate in the vehicle longitudinal direction by its own weight is used as the oil movement suppressing means 31.

The movable plate 32 is supported in a normal state in such a manner that the upper support shaft 32a is rotatably supported by the partition wall 2 of the transmission case 1 and the inner end wall of the converter housing 8 at a position above the partition portion 21. Is suspended by its own weight, and its lower end is disposed away from the upper end of the partition portion 21 toward the vehicle front side. When the oil level L of the lubricating oil is inclined rearward and upward, the liquid movement of the lubricating oil is caused by its own weight. Therefore, the lower end is configured to abut on and engage with the front edge of the upper end of the partition portion 21 to substantially amplify the height of the partition portion 21.

  With the above configuration, in the vehicle transmission device of the present embodiment, the oil level L of the lubricating oil in the bottom portion of the reduction gear chamber 4 is slightly lowered depending on the driving conditions when the vehicle is in a normal posture during normal driving. Even in such a case, a sufficient amount of lubricating oil is secured at the bottom of the gear unit accommodating portion 22 by the partition portion 21, and the oil bath lubrication of the reduction gear unit 11 can be appropriately performed under a low stirring resistance. .

  Further, the oil reservoir 23 is separated from the gear unit accommodating portion 22 by the partition portion 21 even with respect to the relative upward rising inclination of the oil level L of the lubricating oil when the vehicle is traveling on a downhill where the vehicle is in a downwardly inclined posture. As a result, the outflow of the lubricating oil to the side is suppressed, and the gear unit accommodating portion 22 can be secured with an amount of lubricating oil necessary for proper oil bath lubrication of the reduction gear unit 11.

  Furthermore, the partition portion 21 causes the lubricating oil in the oil reservoir 23 to be absorbed by the partition portion 21 against a relative rearward rising inclination of the oil level L of the lubricating oil when the vehicle is climbing up in a posture in which the vehicle leans forward. The movement toward the gear unit accommodating portion 22 is blocked, and an increase in the agitation resistance due to the lubrication of the lubricating oil due to an increase in the amount of lubricating oil in the gear unit accommodating portion 22 is avoided, and the original function of the partition portion 21 is reduced. Demonstrated.

  In such setting of the partition portion 21, when the vehicle suddenly starts uphill or suddenly accelerates, the gradient of the back-up slope of the lubricating oil surface L at the bottom of the reduction gear chamber 4 suddenly increases as shown in FIG. 2. When it becomes high, the lubricating oil in the oil reservoir 23 tends to move to the gear unit accommodating portion 22 side beyond the partition portion 21, and the stored lubricating oil in the oil pan 7 is liquid. A large amount of lubricating oil tends to flow into the gear unit accommodating portion 22 by flowing back from the communication port 25 to the oil reservoir 23 by the movement.

  Therefore, if only the partition portion 21 is provided, the agitation resistance of the lubricating oil due to a large amount of lubricating oil flowing into the gear unit housing portion 22 when the vehicle suddenly starts uphill or suddenly accelerates is significantly increased. Become. Further, a large amount of air flows into the oil pan 7 due to the backflow of lubricating oil from the oil pan 7 to the oil reservoir 23, and the strainer 24a of the control valve 24 in the oil pan 7 is exposed to the air. As a result, air is sucked into the control valve 24 and the supply control of the lubricating oil is not properly performed. In order to avoid such a situation, the total filling amount of the lubricating oil in the transmission case 1 must be increased and the oil level L of the lubricating oil at the bottom of the reduction gear chamber 4 must be set higher. In this case, the agitation resistance due to the lubrication of the lubricating oil during normal driving of the vehicle increases, and the intended purpose is not fulfilled.

  On the other hand, according to the present embodiment, when the vehicle suddenly starts uphill or suddenly accelerates, the movable plate 32 as the oil movement restraining means 31 is lubricated by its own weight as shown in FIG. The oil is moved rearward by the inertial movement pressure of oil, and the lower end thereof abuts and engages with the front edge of the upper end of the partition portion 21 to substantially amplify the height of the partition portion 21, and the oil pool The lubricating oil is prevented from flowing from the portion 23 to the gear unit accommodating portion 22.

  As a result, even when the vehicle suddenly starts uphill or suddenly accelerates, the amount of lubricating oil in the gear unit accommodating portion 22 can be appropriately maintained, and the effect of reducing the stirring resistance due to the stagnation of the lubricating oil can be maintained.

And since the mass movement of the lubricating oil from the oil reservoir part 23 to the gear unit accommodating part 22 at the time of sudden uphill start and sudden acceleration of the vehicle can be suppressed in this way, the lubricating oil from the oil pan 7 to the oil reservoir part 23 can be suppressed. The reverse flow of the oil is suppressed, and the inflow of air from the strainer 24a of the control valve 24 is avoided by suppressing the inflow of air into the oil pan 7. Therefore, the total filling amount of the lubricating oil in the transmission case 1 is reduced. Thus, it is possible to set the lubricating oil surface L at the bottom of the reduction gear chamber 4 as low as possible, and it is possible to thoroughly reduce the agitation resistance due to the stagnation of the lubricating oil.

  Since the movable plate 32 can be rotated in the vehicle front-rear direction by its own weight and by the fluid movement of the lubricating oil, the oil level L of the lubricating oil on the oil reservoir 23 side is the partition portion even when the vehicle is traveling uphill. When the liquid surface is tilted at a height exceeding the upper terminal position of 21, the lower end of the movable plate 32 is brought into contact with and locked to the front edge of the upper terminal of the partition portion 21 by turning rearward of the vehicle in the same manner as described above. It is possible to prevent the lubricating oil from flowing into the gear unit accommodating portion 22 from the reservoir portion 23.

  Here, in the present embodiment, the oil movement suppressing means 31 has a simple structure constituted by the movable plate 32 that can be rotated in the vehicle front-rear direction by its own weight and by the inertial movement of the lubricating oil as described above. Therefore, the transmission case 1 can be advantageously obtained in terms of design and cost without a significant design change.

  4 and 5 show a second embodiment of the present invention. In this embodiment, a collar 33 is extended from the upper end of the partition 21 toward the front of the vehicle. 33 is the oil movement suppressing means 31.

  In the driving scene of the vehicle in which the flange 33 is provided so as to be inclined forward and slightly downward from the horizontal, and the oil level L of the lubricating oil at the bottom of the reduction gear chamber 4 is inclined upward as shown in FIG. The flange 33 suppresses the rearward rising of the lubricating oil on the oil reservoir 23 side, and prevents the movement inflow to the gear unit accommodating portion 22.

  Therefore, also by the configuration of the second embodiment, the same stirring resistance reduction effect as that of the first embodiment can be obtained.

  In addition, in this embodiment, since it has a simpler structure in which the flange portion 33 is extended to the upper end of the partition portion 21, cost merit can be increased.

  In the present embodiment, an oil guide plate 34 inclined forward and downward is provided above the flange 33, and is scraped up by the rotation of the reduction gear unit 11 as shown by an arrow A in FIG. Lubricating oil flowing out from the upper side of the gear unit housing portion 22 toward the front of the vehicle is received by the oil guide plate 34 and can be guided to flow down to the oil reservoir 23, so that the circulating action of the lubricating oil to the oil pan 7 can be performed smoothly. Thus, the supply control of the lubricating oil can be performed stably.

  Of course, the oil guide plate 34 can also be applied to the configuration of the first embodiment.

  In the above-described embodiment, an example using a CVT continuously variable transmission has been shown. However, the present invention can also be applied to a device using a gatorene type transmission.

DESCRIPTION OF SYMBOLS 1 ... Transmission case 4 ... Reduction gear chamber 11 ... Reduction gear unit 21 ... Partition part 22 ... Gear unit accommodating part 23 ... Oil reservoir part 31 ... Oil movement suppression means 32 ... Movable plate 33 ... Eave part 34 ... Oil guide plate

Claims (4)

A partition portion that divides a bottom portion of the reduction gear chamber defined in the transmission case into a gear unit housing portion in which the reduction gear unit is disposed and an oil reservoir portion on the vehicle front side in the vehicle front-rear direction;
Oil that suppresses the movement of the lubricating oil from the oil reservoir portion to the gear unit housing portion beyond the partition portion when the oil level of the lubricating oil filled in the bottom portion of the reduction gear chamber is inclined backward and upward. A vehicle transmission device comprising: a movement suppressing unit.   The oil movement suppression means is disposed at a position above the partition portion so as to be rotatable in the vehicle front-rear direction by its own weight, and in a normal state, the lower end is separated from the upper end of the partition portion toward the vehicle front side, When the oil level of the lubricating oil is tilted backward and upward, it rotates rearward of the vehicle and the lower end abuts and locks against the front edge of the upper end of the partition, substantially amplifying the height of the partition. The vehicle transmission according to claim 1, wherein the transmission is a movable plate.   The vehicle transmission according to claim 1, wherein the oil movement suppression means is a flange extending from the upper end of the partition portion toward the front of the vehicle.   Above the oil movement restraining means, it is inclined to the front, and is received by the lubricating oil that is scraped up by the rotation of the reduction gear unit and flows out from the top of the gear unit housing portion toward the front of the vehicle. The vehicle transmission according to any one of claims 1 to 3, wherein an oil guide plate is provided to flow down to the oil reservoir.

Images